Design and test of 5TZ-900 vibrating screen cleaning threshing machine
In view of the difficult operation of combine harvesters in small and medium-sized plots such as terraces in mountainous areas of Gansu Province,and the demand for threshing operations of grain crops such as wheat and oats mainly in the courtyards of farmers,the 5TZ-900 vibrating screen threshing machine was designed,which integrated the functions of feeding,threshing,cleaning and weeding.The basic structure,working principle and main technical parameters of the machine were introduced.The theoretical analysis and structural design of the key components such as threshing device,cleaning device and transmission device were carried out.The size of threshing drum,the number of nail teeth and the structure size of vibrating screen were calculated and analyzed to meet the working requirements.The main technical parameters affecting the operation qualification rate of vibrating screen cleaning threshing machine were determined,and the operation performance test of the whole machine was carried out.The performance test results showed that the noise of the machine was 79.8 dB(A)when the machine was running without load.When the grass-to-grain ratio of the test crop was 0.9,the grain moisture content was between 15％and 20％,and the rotation speed of the machine drum was 1 040 r/min,the crushing rate of the machine operation ws 0.94％,the impurity rate was 1.04％,the unremoval rate was 0.93％,the total loss rate was 1.36％,and the production efficiency wais 1 120 kg/h.The indicators meet the design requirements and related standards.
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