Parameters of oscillations the holding handles of the manual vibro-impact fruit shaker

Abstract

Annotation Purpose. Improving the efficiency of the manual vibro-impact fruit shaker by studying the parameters of oscillations of the handles during the operating mode of shaking to justify the maximum accelerations that can be transmitted to the hands of the worker. Methods. The main provisions of laboratory and field experiments using modern measuring equipment for measuring accelerations are used. Results. The parameters of oscillations of the holding handles of the manual vibrating shock shaker of fruits are investigated. The method of measuring local accelerations transmitted to the hands of the employee has been improved. It is proposed to use accelerometers ANS 114-02, which are attached with adhesive tape to the holding handles of the shaker along the x and y axes of the orthogonal coordinate system. The y-axis is directed in the direction of oscillation and coincides with the longitudinal axis of symmetry of the handles, and the x-axis – along the forearm of the worker perpendicular to the y-axis. The estimation of the admissibility of the total vibration on the shaker handles was carried out according to the method, which consists in determining the root mean square values of the accelerations of longitudinal-vertical oscillations in the frequency bands up to 31.5 Hz. The oscillating loads on the handles of the manual fruit shaker operating in the vibro-shock mode are investigated. At the same time, local oscillations of non-constant action are transferred to the hands of the worker during working hours. The studies were performed at the highest perturbing forces in the range of operating shaking frequencies of 40–100 rad/s (6.37–15.92 Hz) on skeletal branches with a diameter of 90 mm at the base. Frequency-adjusted root mean square accelerations on the holding handles do not exceed the allowable values. Conclusions. Oscillatory loads on the hands of the worker through the handles, ensuring the retention of the manual vibratory shock shaker, do not exceed the allowable short-term local oscillations on the adjusted values of the root mean square acceleration and are: along the y-axis – 2.47 m/s2 (78.3 dB); along the x-axis perpendicular to the y-axis – 0.63 m/s2 (66.4 dB). Keywords: manual fruit shakers, holding handles, local oscillations, acceleration.