Combined axial-flow cylinder for threshing with reduced grain entrainment

Abstract

A combined axial flow threshing drum, belonging to agricultural machinery, reduces grain entrainment loss. A cylindrical shaft-type main gear seat is fixedly mounted between the conical spiral feed head and the support plate. Main pin teeth are fixed on the cylindrical shaft-type main gear seat. A limiting groove is provided on the shaft wall of the cylindrical shaft-type main gear seat, located between adjacent main pin teeth. A shaft-type auxiliary gear seat with threaded holes is axially and radially positioned and circumferentially reciprocatingly inserted into the shaft hole of the cylindrical shaft-type main gear seat. Torsion springs are fitted on both ends of the shaft-type auxiliary gear seat. Auxiliary pin teeth are inserted into the limiting grooves. The auxiliary pin teeth are fixed to the shaft-type auxiliary gear seat by the tightening fit between the external threads on the auxiliary pin teeth and the threaded holes on the shaft-type auxiliary gear seat. This drum has a novel, unique, simple, and reasonable structure, resulting in less grain entrainment loss, high operating efficiency, and good operating quality during threshing.

Description

Technical Field

[0001] This invention belongs to agricultural machinery and mainly relates to a main and auxiliary nail tooth combination axial flow threshing drum that can reduce grain entrainment loss during threshing operations. Background Technology

[0002] Currently, the threshing teeth on existing axial-flow threshing drums are all fixed to the tooth base plate. During threshing, the rotating threshing drum drives the threshing teeth to rotate via the tooth base plate. The threshing teeth strike the grain ears, and through impact and friction, the grains are detached and pass through the straw layer to complete the threshing and separation process. Years of practical experience have shown that using a single fixed threshing tooth to strike the ears makes it difficult for the grains to break through the thick straw layer and separate, resulting in significant entrainment losses. To date, the grain entrainment loss rate of threshing drums remains high, and a satisfactory solution has yet to be found. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the prior art and, in combination with the actual needs of current threshing operations, to research and design a combined axial flow threshing drum that can reduce grain entrainment loss, thereby significantly reducing grain entrainment loss during threshing operations.

[0004] The objective of this invention is achieved as follows: a cylindrical shaft-type main gear seat is supported and fixed between the conical spiral feed head and the support base plate; multiple main pin teeth are sequentially fixed along the axial direction on the cylindrical shaft-type main gear seat; limiting grooves are respectively provided on the shaft wall of the cylindrical shaft-type main gear seat at the positions between adjacent main pin teeth; a shaft-type auxiliary gear seat is inserted into the shaft hole of the cylindrical shaft-type main gear seat, axially and radially positioned and circumferentially rotatable; multiple threaded holes are sequentially provided along the axial direction on the shaft-type auxiliary gear seat for the insertion of auxiliary pin teeth. Within the limiting slot on the cylindrical main gear seat, the auxiliary pin tooth is fixed to the cylindrical auxiliary gear seat as a whole by tightening the external thread on the auxiliary pin tooth with the threaded hole on the cylindrical auxiliary gear seat. Torsion springs are respectively fitted and installed on the outer ends of the cylindrical auxiliary gear seat. The outer end and inner end of the torsion spring are fixedly connected to the auxiliary pin tooth and the cylindrical main gear seat, respectively. The limiting slot and the auxiliary pin tooth are in a rotational position limiting fit. Thus, a combined axial flow threshing drum that can reduce grain entrainment loss is formed.

[0005] This invention employs a structure that involves repeated relative movement between the main pin teeth mounted on the cylindrical main tooth seat and the secondary pin teeth mounted on the shaft secondary tooth seat. This facilitates the separation of grains from the straw layer during operation, solving the technical problem of high grain entrainment loss rate. It features a novel, unique, reasonable, and simple structure, resulting in less grain entrainment loss, high operating efficiency, and good operating quality during threshing. Attached Figure Description

[0006] Figure 1 This is a three-dimensional schematic diagram of the overall structure of a combined axial flow threshing drum that can reduce grain entrainment loss.

[0007] Figure 2 This is a three-dimensional schematic diagram of the assembly structure of the cylindrical shaft main gear seat and the shaft-type auxiliary gear seat;

[0008] Figure 3 This is a two-dimensional schematic diagram of the assembly structure of the cylindrical shaft main gear seat and the shaft-type auxiliary gear seat;

[0009] Figure 4 yes Figure 2 Exploded view.

[0010] Part number description in the image:

[0011] 1. Conical spiral feed head; 2. Shaft-type auxiliary gear seat; 2-1. Threaded hole; 3. Drive shaft; 4. Cylindrical shaft-type main gear seat; 4-1. Limiting groove; 5. Main pin tooth; 6. Auxiliary pin tooth; 6-1. External thread; 7. Torsion spring; 8. Support plate; 9. Pulley. Detailed Implementation

[0012] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. A combined axial flow threshing drum that can reduce grain entrainment loss includes a drive shaft 3. A conical spiral feed head 1, a support plate 8, and a pulley 9 are sequentially fixed on the drive shaft 3. A cylindrical shaft-type main gear seat 4 is supported and fixed between the conical spiral feed head 1 and the support plate 8. Multiple main nail teeth 5 are sequentially fixed on the cylindrical shaft-type main gear seat 4 along the axial direction. Limiting slots 4-1 are respectively provided on the shaft wall of the cylindrical shaft-type main gear seat 4 at the positions between adjacent main nail teeth 5. A shaft-type auxiliary gear seat is inserted into the shaft hole of the cylindrical shaft-type main gear seat 4 for axial and radial positioning and circumferential reciprocating rotation. 2. Multiple threaded holes 2-1 are sequentially arranged along the axial direction on the shaft-type auxiliary gear seat 2. The auxiliary pin tooth 6 is inserted into the limiting slot 4-1 on the cylindrical shaft-type main gear seat 4. The auxiliary pin tooth 6 is fixedly mounted on the shaft-type auxiliary gear seat 2 by the tightening fit between the external thread 6-1 on the auxiliary pin tooth 6 and the threaded hole 2-1 on the shaft-type auxiliary gear seat 2. Torsion springs 7 are respectively fitted and installed on the outer ends of the shaft-type auxiliary gear seat 2. The outer end and inner end of the torsion spring 7 are fixedly connected to the auxiliary pin tooth 6 and the cylindrical shaft-type main gear seat 4, respectively. The limiting slot 4-1 is in a rotational position limiting fit with the auxiliary pin tooth 6.

[0013] During operation, the external rotational power is transmitted through the pulley 9, drive shaft 3, support plate 8, and conical spiral feed head 1 to drive the main gear seat 4 of the cylinder shaft, which in turn drives the auxiliary gear seat 2 of the shaft, as well as the main nail teeth 5 and auxiliary nail teeth 6 to revolve around the axis of the drive shaft 3. The crop straw to be threshed is fed into the conical spiral feed head 1 along the axial direction of the drive shaft 3. As the straw flows from the conical spiral feed head 1 to the support plate 8, the main nail teeth 5 and auxiliary nail teeth 6 strike and rub the ears of straw to complete the threshing process. During operation, the resistance caused by the changing straw, and with the cooperation of the torsion spring 7, causes the shaft-type auxiliary gear seat 2 to reciprocate circumferentially within the cylindrical shaft-type main gear seat 4. The shaft-type auxiliary gear seat 2 drives the auxiliary nail tooth 6 to reciprocate torsional motion within the limiting groove 4-1 on the cylindrical shaft-type main gear seat 4, causing a rotational speed difference between the auxiliary nail tooth 6 and the main nail tooth 5 in the circumferential direction. This creates a shaking disturbance in the straw layer, causing the grains trapped in the straw layer to separate out, thereby reducing and minimizing grain loss.

Claims

1. A combined axial flow threshing drum that reduces grain entrainment loss, comprising a drive shaft (3), on which a conical spiral feed head (1), a support plate (8), and a pulley (9) are sequentially fixed, characterized in that: A cylindrical shaft-type main gear seat (4) is supported and fixed between the conical spiral feed head (1) and the support base plate (8). Multiple main pin teeth (5) are sequentially fixed on the cylindrical shaft-type main gear seat (4) along the axial direction. Limiting slots (4-1) are respectively provided on the shaft wall of the cylindrical shaft-type main gear seat (4) at the positions between adjacent main pin teeth (5). A shaft-type auxiliary gear seat (2) is inserted into the shaft hole of the cylindrical shaft-type main gear seat (4) for axial and radial positioning and circumferential reciprocating rotation. Multiple threaded holes (2-1) are sequentially provided on the shaft-type auxiliary gear seat (2) along the axial direction. Auxiliary pin teeth (6) are provided. The auxiliary pin tooth (6) is inserted into the limiting slot (4-1) on the cylindrical main gear seat (4). The auxiliary pin tooth (6) is fixed on the cylindrical auxiliary gear seat (2) by the tightening fit between the external thread (6-1) on the auxiliary pin tooth (6) and the threaded hole (2-1) on the shaft auxiliary gear seat (2). Torsion springs (7) are respectively fitted on the outer ends of the shaft auxiliary gear seat (2). The outer end and inner end of the torsion spring (7) are fixedly connected to the auxiliary pin tooth (6) and the cylindrical main gear seat (4) respectively. The limiting slot (4-1) and the auxiliary pin tooth (6) are in a rotational position limiting fit.

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