Conveying trough of grain combine harvester

Abstract

The utility model relates to the technical field of harvesters, in particular to a grain combine harvester conveying trough which comprises a conveying trough body and a conveying mechanism arranged in the conveying trough body, and oil cylinder assemblies are symmetrically arranged at the bottom of one end of the conveying trough body. The conveying groove body comprises a gap bridge bottom plate and side panels, the side panels are perpendicularly arranged on the two sides of the gap bridge bottom plate, a front connecting plate and an arc plate are arranged at the two ends of the tops of the two side panels respectively, a middle connecting plate is arranged between the front connecting plate and the arc plate, and tensioning assemblies are arranged on the two side panels. The conveying mechanism comprises a driving shaft, a driven shaft, a chain and conveying chain harrows, the two ends of the driven shaft are connected with the two tensioning assemblies respectively, the chain is arranged on a driving chain wheel and a driven chain wheel in a sleeving mode, and the multiple conveying chain harrows are distributed on the chain at intervals. By changing the mounting position of the hydraulic oil cylinder, the stability of the header is improved; and the universality of the conveying groove is enhanced, and the conveying groove can be suitable for harvesting machine cutting tables of different types and models.

Description

Technical Field

[0001] The utility model relates to the technical field of harvesters, in particular to a conveying trough for a grain combine harvester. Background Art

[0002] The working principle of the harvester is to harvest the grains through blades and a complex transmission system. The harvester consists of an operating console, a cutting mechanism, a conveying mechanism, a threshing mechanism, a grain box, and a hydraulic system. The harvester transports the cut grains to the threshing mechanism through a conveying mechanism, and the grains enter the grain box after being threshed by the threshing mechanism. During the harvester's grain harvesting process, the harvester's header cuts the grains, and the harvester's auger transports the cut grains to the conveying trough, and then transports them to the threshing drum through the conveying trough for threshing, and then screens them with a vibrating screen and a fan. The conveying trough is used to transport the cut grains to the threshing drum through a conveyor belt or chain. The two ends of the conveying trough are respectively connected to the header and the machine body, and a hydraulic cylinder for adjusting the angle of the header and the conveying trough is installed at the bottom of the conveying trough. The two ends of the hydraulic cylinder are respectively hinged to the conveying trough and the pipe beam of the harvester's through-pipe drive bridge.

[0003] The existing harvester conveyor trough has poor versatility and cannot be applied to harvester headers of different types and models. When the conveyor trough is used for corn and grain harvester headers, the conveyor trough is prone to structural damage. In addition, the installation position of the existing conveyor trough hydraulic cylinder is unreasonable. When the harvester header and the conveyor trough work at high speed to harvest grains, the stability of the header is poor. Summary of the invention

[0004] The utility model provides a grain combine harvester conveyor trough to solve the problems of poor versatility and poor stability of the harvester conveyor trough in the prior art. The conveyor trough improves the stability of the harvester by changing the installation position of the hydraulic cylinder, so that the structures of the conveyor trough and the harvester are more stable during high-speed operation; and the versatility of the conveyor trough is enhanced, so that it can be suitable for harvester harvesters of different types and models.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a conveying trough of a grain combine harvester, comprising a conveying trough body and a conveying mechanism arranged inside the conveying trough body, wherein a cylinder assembly is symmetrically arranged at the bottom of one end of the conveying trough body. The angle of the conveying trough body can be adjusted by the cylinder assembly, thereby achieving the effect of adjusting the angle of the cutting table through the conveying trough body.

[0006] The conveying trough body includes a bridge bottom plate and side panels, the side panels are vertically arranged on both sides of the bridge bottom plate, the top ends of the two side panels are respectively provided with a front connecting plate and an arc plate, a middle connecting plate is arranged between the front connecting plate and the arc plate, and the two side panels are provided with a tensioning assembly. The bridge bottom plate, the side panels, the front connecting plate, the middle connecting plate and the arc plate constitute the conveying trough body, the cutting platform auger conveys the cut grains into the conveying trough body, and then the conveying mechanism inside it conveys the grains.

[0007] The conveying mechanism includes a driving shaft, a passive shaft, a chain and a conveying chain rake, wherein the driving shaft is rotatably arranged inside the conveying trough, a driving sprocket is fixedly sleeved on the driving shaft, two ends of the passive shaft are respectively connected to two tensioning components, a passive sprocket corresponding to the driving sprocket is rotatably sleeved on the passive shaft, the chain is sleeved on the driving sprocket and the passive sprocket, and a plurality of conveying chain rakes are arranged at intervals on the chain. The conveying chain rake achieves the effect of grain transportation.

[0008] Furthermore, the oil cylinder assembly includes an oil cylinder seat and a hydraulic oil cylinder. The oil cylinder seat is fixedly arranged at the front end bottom of the bridge bottom plate, and a limit plate is fixedly arranged on the oil cylinder seat. The piston rod end of the hydraulic oil cylinder is hinged to the oil cylinder seat, and the hydraulic oil cylinder is located on the outside of the side panel. The hydraulic oil cylinder is used to drive the conveying trough to move, so as to adjust the angle of the conveying trough and the cutting table.

[0009] Furthermore, a plurality of reinforcing angle steels are arranged at intervals at the bottom of the bridge bottom plate, a connecting end plate is arranged at the front end of the bridge bottom plate, a grass guide plate connected to the side panel is arranged at the top of the connecting end plate, and the grass guide plate is in a "V"-shaped structure. The grass guide plate guides the grains cut by the cutting platform so that the grains can be transported to the conveying trough.

[0010] Furthermore, a bridge slot plate is provided at the front end of the side panel, and the upper and lower ends of the bridge slot plate are respectively connected to the connecting end plate and the front connecting plate; a support rod is provided between the bridge slot plate and the bridge bottom plate, and a reinforcing plate is provided at the connection between the bridge slot plate and the front connecting plate. The reinforcing plate plays a role in stabilizing and reinforcing the connection between the front connecting plate and the bridge slot plate.

[0011] Furthermore, the rear ends of the two side panels are fixedly connected to a connecting seat plate, a sleeve is vertically arranged on the connecting seat plate, and a fixing plate is fixedly arranged on the outer side of the connecting seat plate, and the fixing plate is fixedly sleeved on the sleeve. Under the action of the sleeve, the conveying trough body rotates relative to the driving shaft, so that the hydraulic cylinder drives the conveying trough body to move.

[0012] Furthermore, the two ends of the driving shaft are rotatably sleeved in the two sleeves respectively; the number of the driving sprocket, the passive sprocket and the chain are two, and the two ends of the conveying chain rake are connected to the two chains respectively. The movement of the chain drives the conveying chain rake to move, and the grains entering the conveying trough body are transported during the movement of the conveying chain rake.

[0013] Furthermore, the tensioning assembly includes a tensioning plate, a tensioning screw, a pin and a connecting arm, the tensioning plate is provided with an adjustment hole, a screw plate is fixedly provided on the outer side of the tensioning plate, the tensioning screw is slidably provided on the screw plate, two locking nuts are threadedly connected to the tensioning screw, the two locking nuts are respectively located on both sides of the screw plate, and one end of the tensioning screw is fixedly connected to a connecting block. The position of the passive shaft can be adjusted through the two tensioning assemblies, thereby achieving the effect of adjusting the tension of the chain.

[0014] Furthermore, the pin shaft is arranged inside the adjusting hole, the connecting block is sleeved on the pin shaft, and one end of the pin shaft is threadedly connected with a fixing nut; a connecting sleeve is also fixedly sleeved on the pin shaft, and the connecting sleeve is located on the inner side of the tensioning plate; one end of the connecting arm is fixedly connected to the connecting sleeve, and the other end of the connecting arm is fixedly connected to the shaft head of the passive shaft.

[0015] Through the above technical solution, the beneficial effects of the utility model are:

[0016] The utility model has a reasonable structure and good use effect. By changing the installation position of the hydraulic cylinder, the stability of the cutting platform is improved, and the structure of the conveying trough and the cutting platform is more stable during high-speed operation; and the versatility of the conveying trough is enhanced, and it can be suitable for harvester cutting platforms of different types and models. When used on the cutting platforms of corn and grain harvesters, the conveying trough will not suffer structural damage.

[0017] The utility model forms a conveying trough body through a bridge bottom plate, a side panel, a front connecting plate, a middle connecting plate and an arc plate. The conveying trough body serves as a passage for conveying grains, so that a cutting platform auger conveys the cut grains into the conveying trough body, and the grains are conveyed to a threshing drum through a conveying mechanism inside the conveying trough body.

[0018] The utility model achieves the effect of improving the stability of the cutting platform and the structural stability of the conveying trough and the cutting platform and enhancing the versatility of the conveying trough by symmetrically installing the hydraulic cylinder at the bottom of the conveying trough body. The hydraulic cylinder can drive the conveying trough body to move, thereby achieving the effect of adjusting the conveying trough body and further achieving the effect of adjusting the angle of the cutting platform.

[0019] The utility model can make the chain drive through the cooperation of the chain, the driving sprocket and the driven sprocket. The chain can drive the conveying chain rake to move during the chain driving process. The conveying chain rake plays the effect of conveying the grains entering the conveying trough body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a conveying trough of a grain combine harvester of the utility model. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of a conveying trough of a grain combine harvester of the utility model. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the structure of the conveying trough of the utility model. Figure 1 ;

[0023] Figure 4 This is a schematic diagram of the structure of the conveying trough of the utility model. Figure 2 ;

[0024] Figure 5 This is a schematic diagram of the structure of the conveying trough of the utility model. Figure 3 ;

[0025] Figure 6 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0026] The numbers in the accompanying drawings are: 1 is the bridge bottom plate, 2 is the reinforced angle steel, 3 is the side panel, 4 is the connecting end plate, 5 is the bridge mouth groove plate, 6 is the support rod, 7 is the grass guide plate, 8 is the front connecting plate, 9 is the arc plate, 10 is the middle connecting plate, 11 is the cylinder seat, 12 is the limit plate, 13 is the hydraulic cylinder, 14 is the connecting seat plate, 15 is the sleeve, 16 is the fixed plate, 17 is the reinforcing plate, 18 is the passive shaft, 19 is the passive sprocket, 20 is the chain, 21 is the conveying chain rake, 22 is the connecting arm, 23 is the adjusting hole, 24 is the tensioning plate, 25 is the screw plate, 26 is the tensioning screw, 27 is the locking nut, 28 is the connecting block, and 29 is the pin shaft. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0028] like Figure 1 to Figure 6 As shown, a grain combine harvester conveyor trough includes a conveyor trough body and a conveying mechanism disposed inside the conveyor trough body, and a cylinder assembly is symmetrically disposed at the bottom of one end of the conveyor trough body. In this embodiment, the front end of the conveyor trough body is used to connect with the harvester header, and the conveying mechanism conveys the grain entering the conveyor trough body. There are two cylinder assemblies, which play the role of adjusting the angle of the conveyor trough body.

[0029] The conveying trough body includes a bridge bottom plate 1 and side panels 3. The side panels 3 are vertically arranged on both sides of the bridge bottom plate 1. The top ends of the two side panels 3 are respectively provided with a front connecting plate 8 and an arc plate 9. A middle connecting plate 10 is arranged between the front connecting plate 8 and the arc plate 9. A tensioning assembly is arranged on the two side panels 3. In this embodiment, the front connecting plate 8 is installed at the feeding end of the conveying trough body, and the arc plate 9 is installed at the discharging end of the conveying trough body. A supporting beam is installed between the two side panels 3. Reinforcing ribs are fixedly installed on the outer sides of the two side panels 3, wherein a tensioning brace is also fixedly installed on the inner upper part of the side panel 3. The front connecting plate 8, the arc plate 9 and the middle connecting plate 10 are bolted to the tensioning brace and the supporting beam. The tensioning assembly is used to adjust the tension of the conveying mechanism chain 20.

[0030] The conveying mechanism includes a driving shaft, a driven shaft 18, a chain 20 and a conveying chain rake 21, wherein the driving shaft is rotatably arranged inside the conveying trough, a driving sprocket is fixedly sleeved on the driving shaft, two ends of the driven shaft 18 are respectively connected to the two tensioning components, a driven sprocket 19 corresponding to the driving sprocket is rotatably sleeved on the driven shaft 18, the chain 20 is sleeved on the driving sprocket and the driven sprocket 19, and a plurality of conveying chain rakes 21 are arranged at intervals on the chain 20. In this embodiment, the driven sprocket 19 is rotatably connected to the driven shaft 18 through a bearing, both ends of the driving shaft extend to the outside of the conveying trough, and a driven wheel is installed at one end of the driving shaft, wherein the driving wheel is driven to rotate by a reduction motor, the driving wheel drives the driven wheel to rotate through a belt, the driven wheel drives the driving shaft to rotate, the driving shaft drives the driving sprocket to rotate, the driving sprocket drives the driven sprocket 19 to rotate through the chain 20, and the chain 20 drives the conveying chain rake 21 to rotate during the transmission process, and the conveying chain rake 21 transports the grains from the feeding end of the conveying trough to the discharging end.

[0031] The cylinder assembly includes a cylinder seat 11 and a hydraulic cylinder 13. The cylinder seat 11 is fixedly arranged at the front bottom of the bridge bottom plate 1, and a limit plate 12 is fixedly arranged on the cylinder seat 11; the piston rod end of the hydraulic cylinder 13 is hinged to the cylinder seat 11, and the hydraulic cylinder 13 is located on the outside of the side panel 3. In this embodiment, a hinge shaft is installed on the cylinder seat 11, and the piston rod end of the hydraulic cylinder 13 is rotatably sleeved on the hinge shaft. The tail end of the hydraulic cylinder 13 is hinged to the pipe beam of the harvester through-pipe driving bridge. When the piston rod of the hydraulic cylinder 13 is extended, the conveying trough body rotates relative to the driving shaft, and the feed end of the conveying trough body drives the cutting platform to be lifted as a whole; the limit plate 12 limits the piston rod of the hydraulic cylinder 13. When the piston rod of the hydraulic cylinder 13 contacts the limit plate 12, it is the maximum height of the feed end of the conveying trough body.

[0032] A plurality of reinforcing angle steels 2 are arranged at intervals at the bottom of the bridge bottom plate 1, a connecting end plate 4 is arranged at the front end of the bridge bottom plate 1, a grass guide plate 7 connected to the side panel 3 is arranged on the top of the connecting end plate 4, and the grass guide plate 7 is in a "V"-shaped structure. In this embodiment, the two ends of the reinforcing angle steel 2 are respectively fixedly connected to the two side panels 3, which plays a role in stabilizing and reinforcing the connection between the side panels 3 and the bridge bottom plate 1, and the number of the grass guide plates 7 is two, and the two grass guide plates 7 are relatively installed on the top of the connecting end plate 4, and the grass guide plates 7 are also fixedly connected to the inner side of the bridge mouth slot plate 5.

[0033] The front end of the side panel 3 is provided with a bridge slot plate 5, and the upper and lower ends of the bridge slot plate 5 are respectively connected to the connecting end plate 4 and the front connecting plate 8; a support rod 6 is provided between the bridge slot plate 5 and the bridge bottom plate 1, and a reinforcing plate 17 is provided at the connection between the bridge slot plate 5 and the front connecting plate 8. In this embodiment, the two ends of the support rod 6 are respectively fixedly connected to the bridge slot plate 5 and the bridge bottom plate 1, the support rod 6 plays a supporting role for the bridge slot plate 5, and the reinforcing plate 17 plays a role in stabilizing and reinforcing the connection between the bridge slot plate 5 and the front connecting plate 8.

[0034] The rear ends of the two side panels 3 are fixedly connected to a connecting seat plate 14, a sleeve 15 is vertically arranged on the connecting seat plate 14, and a fixing plate 16 is fixedly arranged on the outer side of the connecting seat plate 14, and the fixing plate 16 is fixedly sleeved on the sleeve 15. In this embodiment, the fixing plate 16 further fixes the sleeve 15, and the sleeve 15 cooperates with the driving shaft to adjust the angle of the conveying trough body, so that the feeding end of the conveying trough body is raised or lowered.

[0035] The two ends of the driving shaft are respectively rotatably sleeved in the two sleeves 15; the number of the driving sprocket, the driven sprocket 19 and the chain 20 are two, and the two ends of the conveying chain rake 21 are respectively connected to the two chains 20. In this embodiment, the driving shaft is rotatably connected to the sleeve 15 through a bearing, wherein the conveying chain rake 21 is bolted to the chain 20, and the chain 20 drives the conveying chain rake 21 to move during the transmission process, and the conveying chain rake 21 conveys the grains from the feeding end of the conveying trough to the discharging end.

[0036] The tensioning assembly includes a tensioning plate 24, a tensioning screw 26, a pin 29 and a connecting arm 22. The tensioning plate 24 is provided with an adjustment hole 23. A screw plate 25 is fixedly provided on the outer side of the tensioning plate 24. The tensioning screw 26 is slidably provided on the screw plate 25. Two locking nuts 27 are threadedly connected to the tensioning screw 26. The two locking nuts 27 are respectively located on both sides of the screw plate 25. One end of the tensioning screw 26 is fixedly connected with a connecting block 28. In this embodiment, the cross section of the tensioning plate 24 is a "U"-shaped structure, and a through hole for the tensioning screw 26 to pass through is provided on the screw plate 25.

[0037] The pin shaft 29 is arranged inside the adjustment hole 23, the connection block 28 is sleeved on the pin shaft 29, and one end of the pin shaft 29 is threadedly connected with a fixing nut; a connecting sleeve is also fixedly sleeved on the pin shaft 29, and the connecting sleeve is located on the inner side of the tensioning plate 24; one end of the connecting arm 22 is fixedly connected to the connecting sleeve, and the other end of the connecting arm 22 is fixedly connected to the shaft head of the passive shaft 18. In this embodiment, the fixing nut plays a role of limiting and fixing the connection block 28, and when adjusting the position of the passive shaft 18 and the tension of the chain 20, the pin shaft 29 slides in the adjustment hole 23.

[0038] When the utility model is used, the feed end of the conveying trough body is connected to the cutting table of the cutting machine, the two ends of the driving shaft are respectively sleeved in the two sleeves 15, the piston rod of the hydraulic cylinder 13 is hinged to the cylinder seat 11, and the tail end is hinged to the pipe beam of the harvester through-pipe driving bridge.

[0039] When adjusting the angle of the conveying trough and the cutting platform, the hydraulic cylinder 13 is opened, the piston rod of the hydraulic cylinder 13 is extended, the feed end of the conveying trough is lifted upward, the discharge end of the conveying trough is rotated relative to the driving shaft through the sleeve 15, and the feed end of the conveying trough drives the cutting platform to lift; when the piston rod of the hydraulic cylinder 13 is retracted, the feed end of the conveying trough is lowered, the discharge end of the conveying trough is rotated relative to the driving shaft through the sleeve 15, and the feed end of the conveying trough drives the cutting platform to lower.

[0040] When the harvesting table cuts the grains, the harvesting table auger transports the cut grains to the conveying trough, and the reduction motor drives the driving wheel to rotate, the driving wheel drives the driven wheel to rotate through the belt, the driven wheel drives the driving shaft to rotate, the driving shaft drives the driving sprocket to rotate, the driving sprocket drives the driven sprocket 19 to rotate through the chain 20, and the chain 20 drives the conveying chain rake 21 to rotate during the transmission process, and the conveying chain rake 21 transports the grains from the feed end of the conveying trough to the discharge end.

[0041] When the chain 20 is loose, adjust the tension of the chain 20, rotate the locking nut 27 on the right side of the screw plate 25, and then pull the tensioning screw 26, the tensioning screw 26 slides on the screw plate 25, the tensioning screw 26 drives the connecting block 28 to move, the connecting block 28 drives the pin 29 to slide in the adjustment hole 23, the pin 29 drives the connecting arm 22 to move toward the feed end of the conveying trough through the connecting sleeve, the connecting arm 22 of the two tensioning components drives the driven shaft 28 to move toward the feed end of the conveying trough, thereby achieving the purpose of adjusting the tension of the chain 20, when the tension of the chain 20 is adjusted, rotate the locking nut 27 on the left side of the screw plate 25 to fix the tensioning screw 26.

[0042] The embodiments described above are only preferred embodiments of the utility model and do not limit the scope of implementation of the utility model. Therefore, all equivalent changes or modifications made according to the technical solutions described in the patent scope of the utility model should be included in the scope of the patent application of the utility model.

Claims

1. A grain combine harvester conveyor trough, characterized in that: It comprises a conveying trough body and a conveying mechanism arranged inside the conveying trough body, and a cylinder assembly is symmetrically arranged at the bottom of one end of the conveying trough body; The conveying trough body comprises a bridge bottom plate (1) and side panels (3), the side panels (3) being vertically arranged on both sides of the bridge bottom plate (1), a front connecting plate (8) and an arc plate (9) being arranged at both ends of the top of the two side panels (3), a middle connecting plate (10) being arranged between the front connecting plate (8) and the arc plate (9), and a tensioning assembly being arranged on the two side panels (3); The conveying mechanism comprises a driving shaft, a driven shaft (18), a chain (20) and a conveying chain rake (21); the driving shaft is rotatably arranged inside a conveying trough body; a driving sprocket is fixedly sleeved on the driving shaft; two ends of the driven shaft (18) are respectively connected to two tensioning assemblies; a driven sprocket (19) corresponding to the driving sprocket is rotatably sleeved on the driven shaft (18); the chain (20) is sleeved on the driving sprocket and the driven sprocket (19); and a plurality of conveying chain rakes (21) are spaced apart on the chain (20).

2. A grain combine harvester conveyor trough according to claim 1, characterized in that: The oil cylinder assembly comprises an oil cylinder seat (11) and a hydraulic oil cylinder (13); the oil cylinder seat (11) is fixedly arranged at the front end bottom of the bridge bottom plate (1); a limit plate (12) is fixedly arranged on the oil cylinder seat (11); the piston rod end of the hydraulic oil cylinder (13) is hinged to the oil cylinder seat (11); and the hydraulic oil cylinder (13) is located outside the side panel (3).

3. A grain combine harvester conveyor trough according to claim 1, characterized in that: A plurality of reinforcing angle steels (2) are arranged at intervals at the bottom of the bridge bottom plate (1); a connecting end plate (4) is arranged at the front end of the bridge bottom plate (1); a grass guide plate (7) connected to the side panel (3) is arranged at the top of the connecting end plate (4); the grass guide plate (7) is in a "V"-shaped structure.

4. A grain combine harvester conveyor trough according to claim 3, characterized in that: A bridge slot plate (5) is provided at the front end of the side panel (3), and the upper and lower ends of the bridge slot plate (5) are respectively connected to the connecting end plate (4) and the front connecting plate (8); a support rod (6) is provided between the bridge slot plate (5) and the bridge bottom plate (1), and a reinforcing plate (17) is provided at the connection between the bridge slot plate (5) and the front connecting plate (8).

5. A grain combine harvester conveyor trough according to claim 1, characterized in that: The rear ends of the two side panels (3) are fixedly connected to a connecting seat plate (14), a sleeve (15) is vertically arranged on the connecting seat plate (14), and a fixing plate (16) is also fixedly arranged on the outer side of the connecting seat plate (14), and the fixing plate (16) is fixedly sleeved on the sleeve (15).

6. A grain combine harvester conveyor trough according to claim 5, characterized in that: The two ends of the driving shaft are rotatably sleeved in the two sleeves (15) respectively; the number of the driving sprocket, the driven sprocket (19) and the chain (20) is two, and the two ends of the conveying chain rake (21) are respectively connected to the two chains (20).

7. A grain combine harvester conveyor trough according to claim 1, characterized in that: The tensioning assembly comprises a tensioning plate (24), a tensioning screw (26), a pin (29) and a connecting arm (22); an adjusting hole (23) is provided on the tensioning plate (24); a screw plate (25) is fixedly arranged on the outer side of the tensioning plate (24); the tensioning screw (26) is slidably arranged on the screw plate (25); two locking nuts (27) are threadedly connected to the tensioning screw (26); the two locking nuts (27) are respectively located on two sides of the screw plate (25); one end of the tensioning screw (26) is fixedly connected to a connecting block (28).

8. A grain combine harvester conveyor trough according to claim 7, characterized in that: The pin shaft (29) is arranged inside the adjustment hole (23), the connecting block (28) is sleeved on the pin shaft (29), and one end of the pin shaft (29) is threadedly connected with a fixing nut; a connecting sleeve is also fixedly sleeved on the pin shaft (29), and the connecting sleeve is located on the inner side of the tensioning plate (24); one end of the connecting arm (22) is fixedly connected to the connecting sleeve, and the other end of the connecting arm (22) is fixedly connected to the shaft head of the passive shaft (18).

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