Pub Date : 2023-02-20DOI: 10.21440/0536-1028-2023-1-55-65
L. Senin, T. Senina
The research objective is to develop a new method of seismic microzoning (SMZ) based on the spectral ratios between seismic signal’s horizontal and vertical components, i.e. on the vulnerability coefficient of the topmost soil stratum. Methods of research. The HVSR spectral ratio analysis has been used for a long time in various modifications. However, in author’s opinion, what’s new is the approach to seismic hazard zoning proposed in this research. It uses the vulnerability indices and subsequent recalculation into seismic intensity increments. The SMZ method based on the vulnerability coefficient considered in this article is not mandatory, although it is a variation of the spectral ratio method. It may be regarded as an addition to the mandatory seismic stiffness method. The combination of these SMZ methods will arguably increase the capabilities of the method as a whole and improve the accuracy and adequacy of a schematic map of seismic intensity increments. One of the advantages of both spectral ratio method and SMZ method based on the vulnerability index, is that they allow to take into account inelastic and nonlinear deformation processes when strong wave movements impacts on soils. Research results. Based on the calculated spectral characteristics of soils, the method makes it possible to construct schematic SMZ maps for different frequency ranges. Another advantage of the proposed of seismic microzoning method is that it eliminates the requirements for the synchronic microtremor measurements on the studied and reference soils. Moreover, the fact that there is simply no need for reference soils is a prerequisite for the method. The local vulnerability can therefore be assessed using only one seismic recorder with a 3-component sensor ignoring the location of microseismic motions sources and their characteristics variation over time.
{"title":"A method of seismic microzoning based on the vulnerability coefficient","authors":"L. Senin, T. Senina","doi":"10.21440/0536-1028-2023-1-55-65","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-1-55-65","url":null,"abstract":"The research objective is to develop a new method of seismic microzoning (SMZ) based on the spectral ratios between seismic signal’s horizontal and vertical components, i.e. on the vulnerability coefficient of the topmost soil stratum. Methods of research. The HVSR spectral ratio analysis has been used for a long time in various modifications. However, in author’s opinion, what’s new is the approach to seismic hazard zoning proposed in this research. It uses the vulnerability indices and subsequent recalculation into seismic intensity increments. The SMZ method based on the vulnerability coefficient considered in this article is not mandatory, although it is a variation of the spectral ratio method. It may be regarded as an addition to the mandatory seismic stiffness method. The combination of these SMZ methods will arguably increase the capabilities of the method as a whole and improve the accuracy and adequacy of a schematic map of seismic intensity increments. One of the advantages of both spectral ratio method and SMZ method based on the vulnerability index, is that they allow to take into account inelastic and nonlinear deformation processes when strong wave movements impacts on soils. Research results. Based on the calculated spectral characteristics of soils, the method makes it possible to construct schematic SMZ maps for different frequency ranges. Another advantage of the proposed of seismic microzoning method is that it eliminates the requirements for the synchronic microtremor measurements on the studied and reference soils. Moreover, the fact that there is simply no need for reference soils is a prerequisite for the method. The local vulnerability can therefore be assessed using only one seismic recorder with a 3-component sensor ignoring the location of microseismic motions sources and their characteristics variation over time.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"42 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85873241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.21440/0536-1028-2023-1-89-100
S. Kornilkov, I. Kravchuk, V. Cherepanov
Research relevance. Studies of the causes and mechanism of hazardous production situations origin and development at coal mining enterprises have shown that their development is most often due to organizational factors, and the prerequisites for their occurrence are associated, to a greater extent, with process flow factors of mining operations, including design decisions. For this reason, it became necessary to establish specific process flow factors that are prerequisites for the emergence of hazardous production situations at a coal pit. Research objective is to establish the factors of hazardous production situations occurrence; to identify and justify indicators of hazardous production situations origin, obtained based on an assessment of the general state of mining, to take into account appropriate scenarios for preventing or avoiding the hazardous production situations in the course of development; to diagnose early signs of their occurrence and eliminate the causes of their development. Methods of research. The state of mining in the coal pit and operations on production safety were assessed from the perspective of hazardous production situations origin and development and was carried out during the process audit. Indicators of the state of the deep pit working area were formed based on the analysis of data from geographic information monitoring of mining, safety rules, as well as process flow diagrams of mining operations. Results. Based on the results of the process audit of the state of mining operations, the factors that are prerequisites for the development of hazardous production situations are determined. They became the basis for the selection of process flow and organizational indicators of hazardous production situations occurrence. The conditions for hazardous production situations occurrence are defined, depending on the presence of objective natural, process flow and organizational factors affecting the safety of work. Conclusions. Open-pit coal mining is naturally accompanied by the emergence and development of hazardous production situations. It is proposed to monitor the prerequisites of hazardous production situations by process flow and organizational indicators in order to make adequate management decisions to prevent the occurrence of hazardous incidents.
{"title":"Indicators of the emergence of hazardous production situations in the integrated monitoring data of the state of mining operations","authors":"S. Kornilkov, I. Kravchuk, V. Cherepanov","doi":"10.21440/0536-1028-2023-1-89-100","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-1-89-100","url":null,"abstract":"Research relevance. Studies of the causes and mechanism of hazardous production situations origin and development at coal mining enterprises have shown that their development is most often due to organizational factors, and the prerequisites for their occurrence are associated, to a greater extent, with process flow factors of mining operations, including design decisions. For this reason, it became necessary to establish specific process flow factors that are prerequisites for the emergence of hazardous production situations at a coal pit. Research objective is to establish the factors of hazardous production situations occurrence; to identify and justify indicators of hazardous production situations origin, obtained based on an assessment of the general state of mining, to take into account appropriate scenarios for preventing or avoiding the hazardous production situations in the course of development; to diagnose early signs of their occurrence and eliminate the causes of their development. Methods of research. The state of mining in the coal pit and operations on production safety were assessed from the perspective of hazardous production situations origin and development and was carried out during the process audit. Indicators of the state of the deep pit working area were formed based on the analysis of data from geographic information monitoring of mining, safety rules, as well as process flow diagrams of mining operations. Results. Based on the results of the process audit of the state of mining operations, the factors that are prerequisites for the development of hazardous production situations are determined. They became the basis for the selection of process flow and organizational indicators of hazardous production situations occurrence. The conditions for hazardous production situations occurrence are defined, depending on the presence of objective natural, process flow and organizational factors affecting the safety of work. Conclusions. Open-pit coal mining is naturally accompanied by the emergence and development of hazardous production situations. It is proposed to monitor the prerequisites of hazardous production situations by process flow and organizational indicators in order to make adequate management decisions to prevent the occurrence of hazardous incidents.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"1 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83100672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.21440/0536-1028-2023-1-101-109
V. Dzaparov, Aleksandr Sakhnov, Igor Zdorovets, Semen Shokhov
Subject of research. The article is devoted to the problem of preserving the quality of the global water resources under the threat of its deterioration caused by industrial effluents polluting the hydrosphere. Research objective is to establish the patterns of changes in water resources state and carry out the ecological detailing of the mechanism for managing water quality and protecting water resources. Methods of research include the generalization and systematization of reported data and literature on the aquatic environment condition in the metallic ore mining regions and methods of mine effluents treatment, laboratory experiments on electrochemical treatment of mineralized effluents to restore their quality, recommendations for improving the management of the aquatic environment state. Research results and scope. A distinctive feature of the problem for regions with mountainous terrain is indicated. The surroundings of mining enterprises were ranked according to metal pollution. The research results on the effluents state at non-ferrous metallurgy facilities are presented. The results of research by the precipitation curve method are summarized. The laboratory experiment results are shown on electrochemical treatment of mineralized effluents and their quality restoration. The direction is indicated of improving the economic efficiency of effluents treatment by increasing by-products output. A technology with the generation of self-neutralizing agents is recommended. It has been established that in the case of heavy metal pollution, the extent of the pollution bubble is determined by the processes of chemicals mixing and dilution. Conclusions. The management of water resources quality and industrial effluents pollution prevention should begin with the establishment of patterns of change in their state as well as with the control mechanism detailing in mountainous terrain.
{"title":"Industrial effluents of mining enterprises of the North Caucasus and water resources","authors":"V. Dzaparov, Aleksandr Sakhnov, Igor Zdorovets, Semen Shokhov","doi":"10.21440/0536-1028-2023-1-101-109","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-1-101-109","url":null,"abstract":"Subject of research. The article is devoted to the problem of preserving the quality of the global water resources under the threat of its deterioration caused by industrial effluents polluting the hydrosphere. Research objective is to establish the patterns of changes in water resources state and carry out the ecological detailing of the mechanism for managing water quality and protecting water resources. Methods of research include the generalization and systematization of reported data and literature on the aquatic environment condition in the metallic ore mining regions and methods of mine effluents treatment, laboratory experiments on electrochemical treatment of mineralized effluents to restore their quality, recommendations for improving the management of the aquatic environment state. Research results and scope. A distinctive feature of the problem for regions with mountainous terrain is indicated. The surroundings of mining enterprises were ranked according to metal pollution. The research results on the effluents state at non-ferrous metallurgy facilities are presented. The results of research by the precipitation curve method are summarized. The laboratory experiment results are shown on electrochemical treatment of mineralized effluents and their quality restoration. The direction is indicated of improving the economic efficiency of effluents treatment by increasing by-products output. A technology with the generation of self-neutralizing agents is recommended. It has been established that in the case of heavy metal pollution, the extent of the pollution bubble is determined by the processes of chemicals mixing and dilution. Conclusions. The management of water resources quality and industrial effluents pollution prevention should begin with the establishment of patterns of change in their state as well as with the control mechanism detailing in mountainous terrain.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"112 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79594615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.21440/0536-1028-2023-1-110-120
V. Beliaev, I. Gladkova
The article describes the main stages of formation and development of the Department of Philosophy and Cultural Studies within the context of the history of the Ural State Mining University. The current state and prospects of the Department are analyzed according to its three main activity: teaching and methodological, research and development, and social education. Academic subjects are developed to meet the requirements of modern educational policy and aimed at developing students’ universal and professional competences. The subject of scientific research at the department reflects trends in modern humanitarian knowledge development. The social education of the Department is aimed at finding new forms of career guidance counselling. The mission of the Department in the strategic development of the university is defined.
{"title":"The 60th anniversary of the Department of Philosophy and Cultural Studies","authors":"V. Beliaev, I. Gladkova","doi":"10.21440/0536-1028-2023-1-110-120","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-1-110-120","url":null,"abstract":"The article describes the main stages of formation and development of the Department of Philosophy and Cultural Studies within the context of the history of the Ural State Mining University. The current state and prospects of the Department are analyzed according to its three main activity: teaching and methodological, research and development, and social education. Academic subjects are developed to meet the requirements of modern educational policy and aimed at developing students’ universal and professional competences. The subject of scientific research at the department reflects trends in modern humanitarian knowledge development. The social education of the Department is aimed at finding new forms of career guidance counselling. The mission of the Department in the strategic development of the university is defined.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"2012 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86358870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.21440/0536-1028-2023-1-36-45
V. Olizarenko, K. Burmistrov, Artem Zubkov, Aleksandr S. Rybakov
Introduction. The purpose of the power consumption comparative evaluation at the mine dewatering is to clarify the methodology of selecting and calculating the actual parameters of D and CNS centrifugal pumps (Russian manufacturer) and LH (Japan) and Flygt (Sweden) submersible pumps by actual working points of intersection of the force pumps features and the external line design features. The results of calculations of centrifugal and submersible pumps power consumption are given in the tabular form when revising the existing mine dewatering scheme of the Akkerman mine. Methods of research. Characteristics of external lines and quantitative values of constant of suction and discharge pipelines of centrifugal and submersible pumps are determined according to the existing methods. External line characteristics were built on individual characteristics diagrams and working points which confirm actual parameters were defined to compare electric power consumption by the studied unit sizes of centrifugal pumps (D, CNS) and submersible pumps (LH, Flygt). Obtained actual operating modes of centrifugal and submersible pumps are checked for compliance with Federal Norm and Regulations requirements. Results and analysis. The calculation data obtained as well as the calculated quantitative values of electric power consumption of the competitive D and CNS pumps and submersible LH and Flygt pumps, given in the tabular form, show that electric power consumption for mine dewatering by pumps of 1D160-112 size and CNS 300-120–360 size is 20% lower. Scope of results. The results of justification of power consumption of centrifugal pumps for mine dewatering are recommended for implementation by organizations performing research and development of mine dewatering with import substitution of foreign submersible pumps
{"title":"Justifying the power consumption of mine dewatering pumps by the example of the Akkerman mine","authors":"V. Olizarenko, K. Burmistrov, Artem Zubkov, Aleksandr S. Rybakov","doi":"10.21440/0536-1028-2023-1-36-45","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-1-36-45","url":null,"abstract":"Introduction. The purpose of the power consumption comparative evaluation at the mine dewatering is to clarify the methodology of selecting and calculating the actual parameters of D and CNS centrifugal pumps (Russian manufacturer) and LH (Japan) and Flygt (Sweden) submersible pumps by actual working points of intersection of the force pumps features and the external line design features. The results of calculations of centrifugal and submersible pumps power consumption are given in the tabular form when revising the existing mine dewatering scheme of the Akkerman mine. Methods of research. Characteristics of external lines and quantitative values of constant of suction and discharge pipelines of centrifugal and submersible pumps are determined according to the existing methods. External line characteristics were built on individual characteristics diagrams and working points which confirm actual parameters were defined to compare electric power consumption by the studied unit sizes of centrifugal pumps (D, CNS) and submersible pumps (LH, Flygt). Obtained actual operating modes of centrifugal and submersible pumps are checked for compliance with Federal Norm and Regulations requirements. Results and analysis. The calculation data obtained as well as the calculated quantitative values of electric power consumption of the competitive D and CNS pumps and submersible LH and Flygt pumps, given in the tabular form, show that electric power consumption for mine dewatering by pumps of 1D160-112 size and CNS 300-120–360 size is 20% lower. Scope of results. The results of justification of power consumption of centrifugal pumps for mine dewatering are recommended for implementation by organizations performing research and development of mine dewatering with import substitution of foreign submersible pumps","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"82 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89098735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.21440/0536-1028-2023-1-46-54
V. Gabov, D. Shishliannikov, Aleksandr N. Korolev, A. Mikriukov, Aleksandr Muravskii
Introduction. The article considers mechanized underground coal mining efficiency improvement by providing rationale for the efficient design of face scraper conveyors (FSC). It is shown that the creation of FSC adaptive to mining, geological and technological conditions that change as the extraction columns are developed, contributes to the stable operation of mechanized mining complexes for coal mining under continuous operation. Methods of research. As a matter of convenient FSC development and structure analysis, it is advisable to use structural formulae that display functional elements and their relationships in the conveyor design. The construction principle is described and examples of structural formulas are given for the existing FSCs. The factors affecting the FSC structure are specified. Advanced designs of adaptive FSCs should be developed taking into account the possibility of fulfilling more main and auxiliary functions. The concept of a face scraper-type cutting conveyor (FSCC) has been introduced. Results. The structural formula of the FSCC adaptive to complex mining and geological operating conditions is substantiated. The schematic diagram and operation procedure for the FSCC proposed by the authors are described. The described technical solutions provide increased efficiency of coal mining and transportation processes and increased operating stability of the fully-mechanized longwall when operating in complex mining and geological conditions. Conclusions. FSCC systematization and analysis in terms of the functional elements structure and design makes it possible to look for implicit ways to improve these transporting machines, increase their adaptability and efficiency in changing mining, geological and technological operating conditions. The adaptive FSCC described in the article ensures effective profiling of ground in the mine working, intensification of the life-in of coal in the bottom-hole zone of the mined coal seam and separation of cargo flows during the selective extraction of coal and rock or advancing through the geological faults.
{"title":"Rationale for the efficient design of a face scraper-type cutting conveyor","authors":"V. Gabov, D. Shishliannikov, Aleksandr N. Korolev, A. Mikriukov, Aleksandr Muravskii","doi":"10.21440/0536-1028-2023-1-46-54","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-1-46-54","url":null,"abstract":"Introduction. The article considers mechanized underground coal mining efficiency improvement by providing rationale for the efficient design of face scraper conveyors (FSC). It is shown that the creation of FSC adaptive to mining, geological and technological conditions that change as the extraction columns are developed, contributes to the stable operation of mechanized mining complexes for coal mining under continuous operation. Methods of research. As a matter of convenient FSC development and structure analysis, it is advisable to use structural formulae that display functional elements and their relationships in the conveyor design. The construction principle is described and examples of structural formulas are given for the existing FSCs. The factors affecting the FSC structure are specified. Advanced designs of adaptive FSCs should be developed taking into account the possibility of fulfilling more main and auxiliary functions. The concept of a face scraper-type cutting conveyor (FSCC) has been introduced. Results. The structural formula of the FSCC adaptive to complex mining and geological operating conditions is substantiated. The schematic diagram and operation procedure for the FSCC proposed by the authors are described. The described technical solutions provide increased efficiency of coal mining and transportation processes and increased operating stability of the fully-mechanized longwall when operating in complex mining and geological conditions. Conclusions. FSCC systematization and analysis in terms of the functional elements structure and design makes it possible to look for implicit ways to improve these transporting machines, increase their adaptability and efficiency in changing mining, geological and technological operating conditions. The adaptive FSCC described in the article ensures effective profiling of ground in the mine working, intensification of the life-in of coal in the bottom-hole zone of the mined coal seam and separation of cargo flows during the selective extraction of coal and rock or advancing through the geological faults.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"86 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83693528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.21440/0536-1028-2023-1-7-15
Liudmila Andreeva, Sergei Abramov2
Introduction. The value of resources is becoming increasingly important to mining proprietors, since the maintenance of mining equipment is quite expensive. Increased scope and cost of repairs are largely determined by the quality of mining machines and equipment operation in production environment, as well as by their reliability and maintainability. The costs of preventive maintenance are over the limit by 40–50%, in most instances, due to equipment shutdowns caused by subsystem failures. Components with hidden defects as well as the methods of components reconditioning that do not ensure long-term operation cause a significant overrun of costs for breakdown maintenance. The quality of mining equipment maintenance is in direct relationship with the effective methods of components reconditioning, including the methods of components hardening both during their manufacture at machinebuilding plants and during their repairs at repair works that carry out complex, mainly major repairs of mining equipment. Adherence to the flow process of reconditioning/hardening of the component surface in contact with another component is of great importance. Therefore, to preserve fixed assets, in particular, mining and transport equipment, it is essential to find that reconditioning methods which allow to preserve consumer properties and operability of equipment for a sufficiently long time. Subject matter. The article provides an overview of methods of mining machine components reconditioning/hardening involving concentrated energy fluxes. In the authors’ opinion, these are the most effective methods to increase the resource and reliability of mining machine components by 2–3 times. The choice of components reconditioning/hardening method depends entirely on the service centre capacities, necessary technological equipment availability, personnel qualifications and, most importantly, economic feasibility of using a particular method of reconditioning/hardening. Research objective is to consider the most effective methods of mining machine components reconditioning/hardening. Methods of research include the interpretation of a number of experiments conducted at mining enterprises to obtain comparative characteristics of the most effective methods of mining machine components reconditioning/hardening. Research results. The most effective methods of components reconditioning/hardening are identified and recommended practices are provided. Conclusions. It has been established that the application of a particular components reconditioning/hardening method should be based on the data from tribological maps, as well as necessary equipment availability and economic feasibility.
{"title":"Methods of mining machine components reconditioning and hardening by means of concentrated energy fluxes","authors":"Liudmila Andreeva, Sergei Abramov2","doi":"10.21440/0536-1028-2023-1-7-15","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-1-7-15","url":null,"abstract":"Introduction. The value of resources is becoming increasingly important to mining proprietors, since the maintenance of mining equipment is quite expensive. Increased scope and cost of repairs are largely determined by the quality of mining machines and equipment operation in production environment, as well as by their reliability and maintainability. The costs of preventive maintenance are over the limit by 40–50%, in most instances, due to equipment shutdowns caused by subsystem failures. Components with hidden defects as well as the methods of components reconditioning that do not ensure long-term operation cause a significant overrun of costs for breakdown maintenance. The quality of mining equipment maintenance is in direct relationship with the effective methods of components reconditioning, including the methods of components hardening both during their manufacture at machinebuilding plants and during their repairs at repair works that carry out complex, mainly major repairs of mining equipment. Adherence to the flow process of reconditioning/hardening of the component surface in contact with another component is of great importance. Therefore, to preserve fixed assets, in particular, mining and transport equipment, it is essential to find that reconditioning methods which allow to preserve consumer properties and operability of equipment for a sufficiently long time. Subject matter. The article provides an overview of methods of mining machine components reconditioning/hardening involving concentrated energy fluxes. In the authors’ opinion, these are the most effective methods to increase the resource and reliability of mining machine components by 2–3 times. The choice of components reconditioning/hardening method depends entirely on the service centre capacities, necessary technological equipment availability, personnel qualifications and, most importantly, economic feasibility of using a particular method of reconditioning/hardening. Research objective is to consider the most effective methods of mining machine components reconditioning/hardening. Methods of research include the interpretation of a number of experiments conducted at mining enterprises to obtain comparative characteristics of the most effective methods of mining machine components reconditioning/hardening. Research results. The most effective methods of components reconditioning/hardening are identified and recommended practices are provided. Conclusions. It has been established that the application of a particular components reconditioning/hardening method should be based on the data from tribological maps, as well as necessary equipment availability and economic feasibility.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"54 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77617274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.21440/0536-1028-2023-1-25-35
P. Bezkorovainyi, V. Shestakov
Introduction. The rationale for the research is conditioned by the need to improve the efficiency of hydraulic excavators which affect the prime cost of mining significantly. Research objective is to improve the design of hydraulic excavator impeller and develop the methods of determining impeller’s rational parameters ensuring its weight reduction. Methods of research. A model of hydraulic excavator with an impeller including a boom, a dipper arm, bucket, and hydraulic slewing cylinders for a boom, a dipper arm, and a bucket. For a front shovel hydraulic excavator, a new design has been developed that excludes hydraulic cylinders for a beam which are used in a base model of hydraulic excavator; a pressure rod is used for boom travel. In the developed scheme of the impeller, a superstructure is installed on the slewing ring, a crowding mechanism for the pressure rod extension is installed in the upper part of the superstructure. The pressure rod is connected to the fore boom and runs inside the saddle bearing. Such scheme allows excluding boom slewing cylinders, reduce the bending moment that has effect on the boom, which is going to reduce the boom cross section and therefore its mass. A mathematical calculation model for excavation coordinates and forces has been developed, as well as an algorithm and software on the Visual Basic language for applications, allowing to determine possible forces in the impeller elements within the limits of the working area. The force values are used when optimizing according to the mass criterion to select the cross section of a boom and dipper arm and for cylinders’ location. The mass criterion application and a restriction in a form of the required technological parameters implementation when operating in the preset mining and technological conditions will allow selecting rational parameters for the impeller’s elements. Results. Changes in the arrangement of elements (elimination of boom slewing hydraulic cylinders and the arrangement of the crowding mechanism on the rotation axis) makes it possible to improve the bucket tonnage, and therefore, the excavator’s capacity. The developed methods of determining the excavator design parameters also ensures the working zone construction and bucket teeth forces calculation within its limits in order to prove the possibility of implementing the operating functions of the new model designed.
{"title":"Determining rational parameters for the impeller of a hydraulic excavator with a crowding mechanism","authors":"P. Bezkorovainyi, V. Shestakov","doi":"10.21440/0536-1028-2023-1-25-35","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-1-25-35","url":null,"abstract":"Introduction. The rationale for the research is conditioned by the need to improve the efficiency of hydraulic excavators which affect the prime cost of mining significantly. Research objective is to improve the design of hydraulic excavator impeller and develop the methods of determining impeller’s rational parameters ensuring its weight reduction. Methods of research. A model of hydraulic excavator with an impeller including a boom, a dipper arm, bucket, and hydraulic slewing cylinders for a boom, a dipper arm, and a bucket. For a front shovel hydraulic excavator, a new design has been developed that excludes hydraulic cylinders for a beam which are used in a base model of hydraulic excavator; a pressure rod is used for boom travel. In the developed scheme of the impeller, a superstructure is installed on the slewing ring, a crowding mechanism for the pressure rod extension is installed in the upper part of the superstructure. The pressure rod is connected to the fore boom and runs inside the saddle bearing. Such scheme allows excluding boom slewing cylinders, reduce the bending moment that has effect on the boom, which is going to reduce the boom cross section and therefore its mass. A mathematical calculation model for excavation coordinates and forces has been developed, as well as an algorithm and software on the Visual Basic language for applications, allowing to determine possible forces in the impeller elements within the limits of the working area. The force values are used when optimizing according to the mass criterion to select the cross section of a boom and dipper arm and for cylinders’ location. The mass criterion application and a restriction in a form of the required technological parameters implementation when operating in the preset mining and technological conditions will allow selecting rational parameters for the impeller’s elements. Results. Changes in the arrangement of elements (elimination of boom slewing hydraulic cylinders and the arrangement of the crowding mechanism on the rotation axis) makes it possible to improve the bucket tonnage, and therefore, the excavator’s capacity. The developed methods of determining the excavator design parameters also ensures the working zone construction and bucket teeth forces calculation within its limits in order to prove the possibility of implementing the operating functions of the new model designed.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"18 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88846469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.21440/0536-1028-2023-1-66-77
V. Kozin, A. Komlev, E. Stupakova
Introduction. Theoretical results have been obtained that allow calculating random sampling errors. One of the main calculation formulas for determining the sampling error is the sample reduction error formula. The sampling errors determined by this formula differ from the errors determined experimentally. The sample reduction error consists of several components, a separate quantitative determination of which is necessary when developing methodological support for testing processes. It is impossible to determine all these components separately from each other experimentally. It is necessary to determine the ratio of the components of the specified formula. Methods of research. The sample reduction error, determined analytically, is the minimum possible reduction error when this operation is ideally performed. To take into account the deviation from the ideal conditions for performing the reduction operation, it is necessary to experimentally estimate the amount of the actual deviation and link it with the theoretical result. As a result, the value of the correction factor can be obtained, which should be entered into the formula for calculating the reduction error. In order to eliminate the need for experimental determination of the error of the method of measuring the mass fraction, experiments to determine the correction factor should be performed on artificial samples with markers. Research procedure. Experiments were performed to reduce samples with markers. 480 reductions of the same sample were performed, which showed the coincidence of the theoretical and experimental distributions of the number of markers in the reduced samples. The correction factor in the experiment with markers of the correct shape was 1.3. The same coefficient in the experiment with markers whose granulometric composition match with that of the sample material was 2.0. The average value of the correction factor in reproducibility conditions was 2.13. Results and analysis. As a result of two experiments on multiple reduction of the sample, it was found that the correction factor under reproducibility conditions should be within 1.3 and 2.0. Similar information about the differences in reproducibility and repeatability errors in international and Russian standards shows that in order to move from a theoretical formula to a real reproducibility error, a correction factor from 2.0 to 3.0 should be introduced. Conclusions. The introduction of correction coefficients into the reduction error formula makes it possible to calculate the real errors of sample reduction, as well as quantify the results of mineral products testing based on the calculation.
{"title":"Correction factor to the formula of sample reduction error","authors":"V. Kozin, A. Komlev, E. Stupakova","doi":"10.21440/0536-1028-2023-1-66-77","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-1-66-77","url":null,"abstract":"Introduction. Theoretical results have been obtained that allow calculating random sampling errors. One of the main calculation formulas for determining the sampling error is the sample reduction error formula. The sampling errors determined by this formula differ from the errors determined experimentally. The sample reduction error consists of several components, a separate quantitative determination of which is necessary when developing methodological support for testing processes. It is impossible to determine all these components separately from each other experimentally. It is necessary to determine the ratio of the components of the specified formula. Methods of research. The sample reduction error, determined analytically, is the minimum possible reduction error when this operation is ideally performed. To take into account the deviation from the ideal conditions for performing the reduction operation, it is necessary to experimentally estimate the amount of the actual deviation and link it with the theoretical result. As a result, the value of the correction factor can be obtained, which should be entered into the formula for calculating the reduction error. In order to eliminate the need for experimental determination of the error of the method of measuring the mass fraction, experiments to determine the correction factor should be performed on artificial samples with markers. Research procedure. Experiments were performed to reduce samples with markers. 480 reductions of the same sample were performed, which showed the coincidence of the theoretical and experimental distributions of the number of markers in the reduced samples. The correction factor in the experiment with markers of the correct shape was 1.3. The same coefficient in the experiment with markers whose granulometric composition match with that of the sample material was 2.0. The average value of the correction factor in reproducibility conditions was 2.13. Results and analysis. As a result of two experiments on multiple reduction of the sample, it was found that the correction factor under reproducibility conditions should be within 1.3 and 2.0. Similar information about the differences in reproducibility and repeatability errors in international and Russian standards shows that in order to move from a theoretical formula to a real reproducibility error, a correction factor from 2.0 to 3.0 should be introduced. Conclusions. The introduction of correction coefficients into the reduction error formula makes it possible to calculate the real errors of sample reduction, as well as quantify the results of mineral products testing based on the calculation.","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"71 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79266830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.21440/0536-1028-2023-1-16-24
V. Sadovets, E. Rezanova, Roman V. Sadovets
a parametric model for a cutting body blade cutting edge contour of geokhod, which is a new class of mining equipment. The research relevance is due to the need to create a unified methodology for forming the cutting body cutting edge for geokhods of various sizes, since the cutting edge design parameters are heavily dependent on geokhod geometry and force parameters. The research objective is to obtain parametric equations for determining the geometric coordinates of the points of the geokhod cutting body blade cutting edge in Cartesian coordinates. Methods of research. The paper describes the principles of parameterization of the complex geometry of geokhod cutting body blade cutting edge. Research methods include the study of blade edge geometry, as well as its design parameters dependence on geokhod’s force and design parameters. To achieve that, analytical dependencies were selected from the method of calculating the cutting body force parameters, and then parametric functions affecting the cutting body cutting edge geometry were selected. Results. As a result, a geometric model of the cutting body cutting edge in a parametric form was obtained. To demonstrate the formation of the blade cutting edge contact with rock based on the obtained parametric-time dependencies, a computer program was developed with the calculated values probability construction. The dependence between the cutting edge geometry and the geokhod design parameters dictated the modeling of the cutting edge shape for geokhods of different diameters. Conclusions. The obtained parametric expressions for calculating the coordinates of geokhod cutting body contact make it possible to build contact lines of the blade and the rock mass according to the input data. Is has also been proved that geokhod cutting edge shape depends on the geokhod diameter, and its geometric parameters will be individual for each type of geokhod
{"title":"Parametric model for a cutting edge contour of the geokhod cutting body blade","authors":"V. Sadovets, E. Rezanova, Roman V. Sadovets","doi":"10.21440/0536-1028-2023-1-16-24","DOIUrl":"https://doi.org/10.21440/0536-1028-2023-1-16-24","url":null,"abstract":"a parametric model for a cutting body blade cutting edge contour of geokhod, which is a new class of mining equipment. The research relevance is due to the need to create a unified methodology for forming the cutting body cutting edge for geokhods of various sizes, since the cutting edge design parameters are heavily dependent on geokhod geometry and force parameters. The research objective is to obtain parametric equations for determining the geometric coordinates of the points of the geokhod cutting body blade cutting edge in Cartesian coordinates. Methods of research. The paper describes the principles of parameterization of the complex geometry of geokhod cutting body blade cutting edge. Research methods include the study of blade edge geometry, as well as its design parameters dependence on geokhod’s force and design parameters. To achieve that, analytical dependencies were selected from the method of calculating the cutting body force parameters, and then parametric functions affecting the cutting body cutting edge geometry were selected. Results. As a result, a geometric model of the cutting body cutting edge in a parametric form was obtained. To demonstrate the formation of the blade cutting edge contact with rock based on the obtained parametric-time dependencies, a computer program was developed with the calculated values probability construction. The dependence between the cutting edge geometry and the geokhod design parameters dictated the modeling of the cutting edge shape for geokhods of different diameters. Conclusions. The obtained parametric expressions for calculating the coordinates of geokhod cutting body contact make it possible to build contact lines of the blade and the rock mass according to the input data. Is has also been proved that geokhod cutting edge shape depends on the geokhod diameter, and its geometric parameters will be individual for each type of geokhod","PeriodicalId":44136,"journal":{"name":"Lesnoy Zhurnal-Forestry Journal","volume":"36 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90077830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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