Adjustable sieve mesh mechanism of feed hopper of threshing machine

Abstract

The invention provides an adjustable sieve mesh mechanism of a feed hopper of a threshing machine and belongs to agricultural machinery. A V-shaped movable sieve piece with movable sieve piece holes is arranged on the lower portion of the bottom side of a V-shaped fixed sieve piece with fixed sieve piece holes in a containing and covering and transversely-adjusting moving mode, a pull rod is fixedly arranged on one side of the V-shaped movable sieve piece, a lead screw is installed on the outer portion of the bottom side of the feed hopper in an axially and radially positioned and circumferentially rotating mode, a nut plate is arranged on the lead screw in an axially moving mode, and the nut plate is fixedly connected with the pull rod. A handle is fixedly arranged at the end of the lead screw, and arc chamfers are arranged on the peripheries of the upper ends of the walls of the fixed sieve piece holes in the V-shaped fixed sieve piece. According to the mechanism, the size of the leakage flux area of the fixed sieve piece holes in the V-shaped fixed sieve piece is adjusted, and the requirements for discharging operation of different snow powder amounts and dropping grain amounts are met. The adjustable sieve mesh mechanism is novel, reasonable and simple in structure, easy and convenient to adjust, high in adaptability, good in use performance, high in working quality and low in grain breakage rate.

Description

technical field [0001] The invention belongs to agricultural machinery, and mainly relates to a grain thresher. Background technique [0002] The currently used threshers are all equipped with a single-layer V-shaped fixed sieve with fixed hole shape and size sieve holes on the bottom of the hopper, and use the above sieve holes to mix the snow powder in the grain and fall into broken or fermented grains. The grains are discharged out of the machine to ensure the quality of subsequent threshing, separation and cleaning operations. Because the size of the sieve holes on the existing V-shaped fixed sieve cannot be adjusted, that is, it cannot be regulated according to the amount of snow powder and the recovery needs of falling grains, and the operation adaptability is poor. If the V-shaped fixed sieves of different sieve holes are replaced on the bottom of the hopper, not only there are many accessories, but the cost is high, and it is difficult to replace, the operation is d...

AI Technical Summary

Problems solved by technology

Since the size of the sieve hole on the existing V-shaped fixed sieve cannot be adjusted, that is, it cannot be adjusted according to the amount of snow powder and the recovery of fallen seeds, and the adaptability to the operation is poor.

If the V-shaped fixed sieves with different sieve holes are replaced on the bottom of the hopper, not only are there many accessories and high cost, but also it is difficult to replace, the operation is difficult, and the work efficiency is low

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