The investigation of thinning of a layer of the long-fibred flax stems in a channel with adjustable cross-section

Abstract

The rise in the proportion of long fiber in the commodity output of the primary processing enterprises of the fiber flax is an important task, the solution of which is necessary to increase the efficiency of the flax growing. More than half of the losses of long fiber cause a poor quality of preparation of a layer of flax retting to the processing. The technological processes of the existing layer preparation technology can not be adapted to the changed raw material parameters for the roll-up harvesting of the flax. In this regard, the urgency of the development of individual processes and a new technology in general for the preparation of a layer fed to the milling machine of the production line. The main technological process of layer preparation is its thinning. The linear density of the initial layer varies widely. To bring it to a technologically rational value, the equipment must provide a regulation of the coefficient of thinning. It is possible to provide this by using a thinning channel with adjustable cross-section. For its justification in the investigations the aim has been set to determine the influence of the structural and technological factors on the coefficient of thinning of the layer of flax. The investigations were carried out using active experiments on the prototype of this type of thinning channel created in VNIIML. The independent factors were: the linear density of the initial layer; linear velocity of the layer at the output from the thinning channel; height of the channel at the input and output from it. Two versions of the channel implementation are used: from one type of toothed discs with a number of teeth of 40 pieces.; combined - from two types of discs in equal proportion to the number of teeth 40 and 48 pcs. A significant influence on the thinning coefficient of the channel height layer at the input and output, as well as the linear density of the initial layer is determined. The possibility of adjusting the coefficient of thinning the layer by changing the cross-section of the thinning channel. It is established that the number of teeth on the thinning disks and the structure of the thinning channel exert a significant influence on the process of thinning the layer in the channels with free fixation of the stems. Mathematical models that adequately describe the influence on the coefficient of thinning of the investigated factors are presented. Conclusions are formulated about rational parameters of the thinning channel with a controlled cross-section and the expediency of its application for the thinning of the layer of flax.