ANALYSIS OF THE OVERALL VIBRATION LEVEL DURING THE INSTALLATION OF THE GRATING MILL GRAIN CLEANING MACHINE FOR CORRUGATED PNEUMATIC CYLINDER
The process of sieve separation in grain cleaning machines is accompanied by significant vibration loads on the units of the unit, which has a negative impact on the separation process itself, on the reliability of the machine as a whole and on the health of the employees serving the grain cleaning unit. This can be avoided by installing the sieve bed on an elastic pneumatic cylinder filled with compressed air to damp vertically directed vibrations. The efficiency of using the proposed design was determined. Vibration was measured directly on the frame of the laboratory setup during the research. The height of the pneumatic cylinder was 0.3 m. The oscillation frequency of the sieve mill drive was varied from 300 to 500 min-1 with a step of 25 min-1. The vibration amplitude was 16 and 28 mm.The structure of the sieve bed of the standard configuration, suspended on flat hangers, is taken as a comparison object. The use of the proposed technical solution makes it possible to reduce the vibration level by 2.5 - 44.3%, depending on the operating parameters. The greatest discrepancy in the vibration level indicators is observed at a frequency of 300 min-1 and an amplitude of 28 mm (44.3%), and the smallest at a frequency of 400 min-1 and an amplitude of 16 mm (2.5%). It was found that the sieve mill installed on an elastic pneumatic cylinder does not enter into resonance vibration with the frame of the grain cleaning machine and the alternating loads that arise are damped due to the elasticity of the air in the pneumatic cylinder. The analysis of the information received shows that it is possible to reduce the vibration level of machines for post-harvest processing of grain heaps installed in the processing lines of grain cleaning units due to the use of a new design for fastening sieve mills.