SU1447317A1 - Sieve for grain combine cleaning unit - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to agricultural machinery industry, in particular to cleaning working bodies of harvesting units. The purpose of the invention is to increase the throughput of the separating surface and to improve the quality of cleaning. This sieve is made of strips 2, twisted invariably in one direction along their length to the exit, and the crests of twisted strips are provided with fingers, and the width of strips, winding pitch and height of fingers are made increasing to the receiving part of the sifting surface 1. Each step of winding strips 2 composition -, ls 1-2 size strip widths. The maximum height of the fingers 4 is 0.5-0.7 times the vertical component of the oscillation amplitude of the receiving part of the sliding surface. Laying twisted strips 2 sieves made with the direction of winding from the sides of the sieve. This contributes to the orientation of the granulated mass to the most productive part of the sieve. The heap is moving along the sieve surface. Through the fingers 4 and the air flow, the heap is fluffed, resulting in improved grain release from the mass. The displacement of the heap to the edges of the sieve is prevented by the forces arising from the interaction of the heap with the screw surfaces of the strips. The grain, which is formed from the heap-straw, spills through the sieve. 3 hp f-ly. 4 il. tX (L 4 4 SAE

Description

11D

The invention relates to agricultural machinery engineering, in particular to cleaning the working bodies of the threshing units of the threshing machines and is intended for primary processing

grainy heap. I

The aim of the invention is to respect the sieve flow capacity and improve the quality of cleaning,

FIG. 1 depicts a seamer cleaning a combine harvester; Fig 2: Witg1 stripe to: (laGopa separating surface, lateral view; Fig. 3 — to the same; vg1d from above; to FGGo: strip preparation before winding

The sieve of cleaning a combine harvester includes a separating-out} surface, the surface 1 5 formed by HaGtjpor-s twisted bands 2. stacked in the city hallway, each of the two bands has a second reference made in it unchanged. the length of the direction of the comb; -; 3 twisted riojioc 2 equipped with a finger 4, One half of the set of twisted strips 2-one shki with. the left direction of the winding, half with nrazyn (fig.-1 circular arrows).

The combine cleaning sieve works in the following way.,

The grain yoke of the shit, guars from the threshing drum and slash, pops onto the receiving part of the separating surface t of the sieve. Here, when the sieve moves up and down, the fingers 4 are known in a pile, swept it up and dragged it into a stride 5 improving it. grain from the heap eh; ement1 grain heapJ meet with the fingers 4 ridges 3 zktk ;: In the separating surface I,. soriench: 1 evoked: crests 3 (due to the direction: avivka), which is continuous along the length of the strips, towards the vanishing point, receive impulses of purposeful movement. In transport, the whole pile along the separating surface 1 of the reash becomes ordered .. According to the sieve grain screen .1O heap is evenly distributed due to: laid rio.noc 2 facing the siredary of the separating surface 1 by rolling rio.noc 2. Sig.p: G directed to the sieve center, displaced heap to one of the sides of the sieve

The air stream 5 created by the fan is passed through the channels formed by the surfaces of the strips 5 and

five

has the direction of movement in the cracked space, which coincides with the direction of the force F, which prevents the grain-straw heap from slipping from the surface 1, Relative. 7 high in the sieve receiving part fingers And dragging a significant part of 1n: from above Due to the oscillatory movements of the sieve, fingers 4 fluff up the hydrogen, and the jets through the channels of the separating surface i blow the flooded heap to form significant wells through which the grain moves from the upper layers of the well to the surface of the sieve and passes through it.

Increasing the height of the fingers 4 above 0 and 7 of the amplitude of the vertical component of the sieve oscillations leads to the fact that when the sieve moves down and back, the fingers 4 cannot get out of engagement with the pile and tash.at it backwards, which greatly reduces the transport capacity sieve A decrease in the height of the fingers 4. Less than 0.5 of the vertical amplitude of the sieve oscillations amplifies their effectiveness due to a decrease in the exciting and transporting ability.

Уев.пичен1 1е pitch of winding of the strips 2 over two values of the strip width at- Bo; j, viT to a significant increase in the flux channels, and individual straw, particles whose soaring speed and accelerate the velocity of the air jets in the superlattice space, and, if non-granular impurities with a significant, p. .eto on such channels.

Decreasing the step of winding the strips 2 less than its width causes an increase in the angle of inclination of the air streams of the fan at the exit of the passage channels of the separating surface 1, as the angle of inclination of the forming passage ducts to the motion path of the pile increases and approaches 90. This causes inhibition of the movement of the heap-straw heap along the separating surface 1 to the outflow and, accordingly, reduces the transport speed of the heap.

Ф о р. m lu invention

Claims (4)

1. Sieve cleaning combine harvester, including a screening surface formed by a set of U3U4 a horizontal row of twisted along the maximum size of the geometric axes of the bands, characterized in that, in order to increase the capacity of the separating surface and the quality of cleaning, the direction of winding the strips is made unchanged along their length, the crests of the twisted bands are provided with fingers At the same time, the width of the strips, the step of winding and the height of the fingers are increased by increasing to the receiving part of the sifting surface. 2, The sieve according to claim 1, characterized by the fact that the step of winding is polo 17 The sy is the size of the strip width. 3. Solved according to claim 1, characterized in that the maximum height of the fingers is 0.5-0.7 times the vertical component of the width of vibrations of the receiving part of the separating surface. 4. The solution according to claim 1, characterized in that, in order to distribute a heap on the separating surface, which is uniform in width on the sieve, the laying of the strips is performed with the direction of winding from the sides to the center of the sieve, i Editor I.Rybchenkr Compiled by K. Tsallagov Tehred M. Khodanych Order 6774/2 Circulation 661 VNINPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 4/5, Moscow, Zh-35, Raushsk nab. 113035 Phage. 2 fig.z Fy Proofreader L. Patay Subscription