Peanut strip spreader-harvester

Abstract

The utility model discloses a peanut strip spreads harvester, belongs to agricultural machinery technical field. Its solved the low degree of mechanization problem of peanut in harvesting among the prior art. Its main include frame, the frame includes front crossbeam, and the front end of front crossbeam is installed with the traction frame, and the top rotation of front crossbeam is installed with the transverse main drive shaft of setting, and is installed with the main drive wheel on the main drive shaft, and the both sides of main drive shaft are installed with the driving bevel gear respectively, and the both sides of front crossbeam are installed with the vertical setting side drive shaft respectively, and the top of side drive shaft is installed with the passive bevel gear with the driving bevel gear cooperation, and the bottom of side drive shaft is installed with the driving sprocket, and the both sides driving sprocket are connected with the first chain and the second chain of installing on the frame respectively, and the first chain and the second chain are set up with the first clamping section and the second clamping section of mutual adhesion respectively, first clamping section and second clamping section are all relatively and are set up to the inclination of setting upwards to front crossbeam.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural machinery technology, and more specifically, it relates to a peanut strip harvester. Background Technology

[0002] Currently, peanuts are mainly harvested manually, with a low level of mechanization. Manual peanut harvesting not only involves high labor intensity but also low harvesting efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a peanut strip harvester to overcome the problem of low mechanization during peanut harvesting in the prior art.

[0004] This utility model is achieved using the following technical solution: a peanut strip harvester, comprising a frame, the frame including a front crossbeam, a traction frame mounted at the front end of the front crossbeam, a horizontally arranged main drive shaft rotatably mounted on the top of the front crossbeam, a main drive wheel mounted on the main drive shaft, active bevel gears mounted on both sides of the main drive shaft, vertically arranged side drive shafts rotatably mounted on both sides of the front crossbeam, a passive bevel gear cooperating with the active bevel gear mounted on the top of the side drive shaft, and an active sprocket mounted on the bottom of the side drive shaft; the two active sprockets are respectively connected to a first chain and a second chain mounted on the frame, the first chain and the second chain respectively having a first clamping section and a second clamping section that fit together, both the first clamping section and the second clamping section being inclined upward relative to the front crossbeam; a plow assembly is mounted at the front end of the frame between the first clamping section and the second clamping section; a vibrating assembly is also mounted on the frame; a support leg is also mounted on one side of the frame, with rollers mounted on the bottom of the support leg.

[0005] Furthermore, the active bevel gears on both sides are respectively disposed on the outer side of the corresponding passive bevel gear.

[0006] Furthermore, the active bevel gears on both sides are respectively disposed inside the corresponding passive bevel gears.

[0007] Furthermore, the frame also includes a first support beam and a second support beam installed on the left and right sides of the rear end of the front crossbeam. The front end and the rear end of the first support beam are respectively rotatably mounted with a first front sprocket and a first rear sprocket. A first chain is fitted on the first front sprocket, the first rear sprocket and the same-side drive sprocket. The front end and the rear end of the second support beam are rotatably mounted with a second front sprocket and a second rear sprocket. A second chain is fitted on the second front sprocket, the second rear sprocket and the same-side drive sprocket. The chain segment of the first chain between the first front sprocket and the first rear sprocket is a first clamping segment, and the chain segment of the second chain between the second front sprocket and the second rear sprocket is a second clamping segment.

[0008] Furthermore, the second rear sprocket extends further back than the first rear sprocket, and a second guide plate inclined to the left relative to the second support beam is installed at the rear end of the second support beam. A first guide plate inclined to the left relative to the first support beam is installed at the rear end of the first support beam, and the length of the second guide plate is greater than that of the first guide plate.

[0009] Furthermore, the vibration assembly includes a vibration plate and a vibration sprocket rotatably mounted on a first support beam. The vibration sprocket meshes with a first chain. A drive rod is mounted on the bottom surface of the vibration sprocket and is eccentrically positioned with respect to the vibration sprocket. A vibration arm is rotatably mounted on the lower side of the drive rod. A connecting lug is mounted on the vibration plate, and the vibration arm is rotatably connected to the connecting lug. A rotating shaft is mounted on the first support beam, and one end of the vibration plate is rotatably connected to the rotating shaft.

[0010] Furthermore, a first limiting roller is rotatably mounted on one side of the first clamping section of the first support beam, and the first limiting roller is in contact with the first clamping section. A second limiting roller is rotatably mounted on one side of the second clamping section of the second support beam, and the second limiting roller is in contact with the second clamping section.

[0011] Furthermore, the plow blade assembly includes two plow blades arranged in a V-shape. The plow blades are fixedly mounted on the front crossbeam by a support rod, which is vertically downward. The support rod is perpendicular to the traction seat. The support rod includes a thick rod and a thin rod. The bottom of the thick rod has a telescopic hole for the thin rod to be inserted into. The surface of the thick rod has multiple fastening threaded holes, and fastening bolts are installed in the fastening threaded holes. The fastening bolts are inserted into the fastening threaded holes and abut against the thin rod.

[0012] Furthermore, the outriggers are hand-cranked lifting outriggers, and the main drive shaft is rotatably mounted on the front crossbeam via bearing seats on both sides; both the first clamping section and the second clamping section are inclined to the left relative to the front crossbeam.

[0013] Furthermore, the main drive wheel is a sprocket, and a clutch structure is installed on one side of the main drive shaft. The main drive wheel is rotatably mounted on the main drive shaft via bearings. The clutch structure includes a sliding shaft and a lever. The sliding shaft is slidably mounted on the main drive shaft, and a transmission key is installed on the main drive shaft. A keyway for inserting the transmission key is opened on the inner wall of the sliding shaft. A baffle is installed on one side of the transmission key on the main drive shaft, and a spring is installed between the baffle and the sliding shaft. Transmission grooves that can mesh with each other are respectively opened on the opposite surfaces of the sliding shaft and the main drive wheel. An annular groove is also opened on the sliding shaft. One end of the lever is inserted into the annular groove. A rotating hole is opened on the lever. A lead screw inserted into the rotating hole is installed on the frame, and a fastening nut is installed on the lead screw. A support plate is installed on the frame at the end of the lever. Limiting grooves for inserting the lever are respectively opened on the left and right sides of the support plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model enables mechanized peanut harvesting, which reduces labor intensity and significantly improves peanut harvesting efficiency.

[0015] 2. This utility model can vibrate the soil on peanut vines, thereby preventing the peanut vines from carrying too much soil when pulled out of the soil. Attached Figure Description

[0016] Figure 1 , Figure 3 and Figure 4 These are perspective views of this utility model; Figure 2 yes Figure 1 A magnified view of a section at point I; Figure 5 This is a top view of the present invention when the driving bevel gear is located on the outside of the corresponding driven bevel gear; Figure 6 This is a top view of the present invention when the driving bevel gear is located inside the corresponding driven bevel gear.

[0017] In the diagram: 1. Frame; 2. Front crossbeam; 3. Traction frame; 4. Main drive shaft; 5. Main drive wheel; 6. Driving bevel gear; 7. Side drive shaft; 8. Driven bevel gear; 9. Driving sprocket; 10. First chain; 11. Second chain; 12. First clamping section; 13. Second clamping section; 14. Support leg; 15. Roller; 16. First support beam; 17. Second support beam; 18. First front sprocket; 19. First rear sprocket; 20. Second front sprocket; 21. Second rear sprocket; 22. Second guide plate; 23. 24. First guide plate; 25. Vibrating plate; 26. Vibrating sprocket; 27. Drive rod; 28. Vibrating arm; 29. ​​Connecting ear; 20. Rotating shaft; 31. First limiting roller; 32. Second limiting roller; 33. Plow blade; 34. Thick rod; 35. Thin rod; 36. Bearing seat; 37. Sliding shaft; 38. Lever; 39. Transmission key; 40. Baffle; 41. Spring; 42. Transmission groove; 43. Annular groove; 44. Lead screw; 45. Fastening nut; 46. Support plate; 47. Limiting groove; 48. Fastening bolt. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort should fall within the scope of protection of this utility model.

[0019] A peanut strip harvester includes a frame 1, the frame 1 includes a front crossbeam 2, the frame 1 also includes a first support beam 16 and a second support beam 17 installed on the left and right sides of the rear end of the front crossbeam 2, the first support beam 16 and the second support beam 17 are both inclined to the left relative to the front crossbeam 2, and the first support beam 16 and the second support beam 17 are both inclined upward relative to the front crossbeam 2.

[0020] The front crossbeam 2 is equipped with a traction frame 3 at its front end. The front crossbeam 2 is connected to the tractor vehicle through the traction frame 3. The tractor vehicle can be a hand tractor.

[0021] The top of the front crossbeam 2 is rotatably mounted with a transversely arranged main drive shaft 4, which is rotatably mounted on the front crossbeam 2 via two side bearing seats 35.

[0022] The main drive shaft 4 is equipped with a main drive wheel 5, which is a sprocket. The sprocket is connected to the drive shaft on the tractor vehicle through a chain. The tractor vehicle drives the main drive shaft 4 to rotate through the chain and the main drive wheel 5.

[0023] A clutch structure is installed on one side of the main drive shaft 4, and the main drive wheel 5 is rotatably mounted on the main drive shaft 4 via bearings. The clutch structure includes a sliding shaft 36 and a lever 37. The sliding shaft 36 is slidably mounted on the main drive shaft 4, and a transmission key 38 is installed on the main drive shaft 4. The transmission key 38 can be a sliding key or a spline. A keyway is formed on the inner wall of the sliding shaft 36 for the transmission key 38 to be inserted. The sliding shaft 36 achieves a transmission connection with the main drive shaft 4 through the transmission key 38 and the keyway. The main drive shaft 4 is mounted on one side of the transmission key 38. A baffle 39 is provided, and a spring 40 is installed between the baffle 39 and the sliding shaft 36. The sliding shaft 36 and the main drive wheel 5 are respectively provided with intermeshing transmission grooves 41. The sliding shaft 36 is also provided with an annular groove 42. One end of the lever 37 is inserted into the annular groove 42. The lever 37 is provided with a rotating hole. A lead screw 43 is installed on the frame 1 and inserted into the rotating hole. A fastening nut 44 is installed on the lead screw 43. A support plate 45 is installed on the end of the lever 37 on the frame 1. Limiting grooves 46 for the lever 37 to be inserted are respectively provided on the left and right sides of the support plate 45.

[0024] This invention enables the transmission connection or separation of the main drive shaft 4 and the main drive wheel 5 through a clutch structure. When the transmission connection between the main drive shaft 4 and the main drive wheel 5 is required, we first rotate the fastening nut 44 upward, and then move the end of the lever 37 to the upper right until the end of the lever 37 moves to the right limiting groove 46. Then we press the end of the lever 37 into the right limiting groove 46 and rotate the fastening nut 44 downward so that the end of the lever 37 can only be in the right limiting groove 46. During the process of the end of the lever 37 moving to the right, the front end of the lever 37 will simultaneously push the sliding shaft 36 to the left. Under the action of the lever 37 and the spring 40, the sliding shaft 36 will engage with the main drive wheel 5. After the sliding shaft 36 engages with the main drive wheel 5, the end of the lever 37 will be on the upper side of the limiting groove 46 on the right side of the support plate 45. Similarly, when it is necessary to separate the main drive shaft 4 from the main drive wheel 5, we first turn the fastening nut 44 upward and move the end of the lever 37 to the upper left. At this time, the front end of the lever 37 will drive the sliding shaft 36 to move to the right. When the end of the lever 37 moves above the limiting groove 46 on the left side of the support plate 45, the main drive shaft 4 and the sliding shaft 36 separate. At this time, we press the lever 37 into the limiting groove 46 on the left side of the support plate 45 and tighten the fastening nut 44 downward so that the end of the lever 37 can only be in the left limiting groove 46.

[0025] The main drive shaft 4 is equipped with a drive bevel gear 6 on both sides, and the front crossbeam 2 is rotatably equipped with a vertically arranged side drive shaft 7 on both sides. The top of the side drive shaft 7 is equipped with a passive bevel gear 8 that cooperates with the drive bevel gear 6, and the bottom of the side drive shaft 7 is equipped with a drive sprocket 9.

[0026] The main drive shaft 4 of this utility model drives the two active bevel gears 6 to rotate, the two active bevel gears 6 drive the two passive bevel gears 8 to rotate, the two passive bevel gears 8 drive the two side drive shafts 7 to rotate, and the two side drive shafts 7 drive the first chain 10 and the second chain 11 to rotate respectively through the active sprockets 9 at their lower ends.

[0027] The two drive sprockets 9 on both sides are respectively connected to a first chain 10 and a second chain 11 mounted on the frame 1. The first chain 10 and the second chain 11 are respectively provided with a first clamping section 12 and a second clamping section 13 that fit together. The first clamping section 12 and the second clamping section 13 are both inclined to the left relative to the front crossbeam 2, and the first clamping section 12 and the second clamping section 13 are both inclined upward relative to the front crossbeam 2. The front end and the rear end of the first support beam 16 are respectively rotatably mounted with a first front sprocket 18 and a first rear sprocket 19. The first chain 10 is fitted onto the first front sprocket 18, the first rear sprocket 19, and the same-side drive sprocket 9. The front and rear ends of the second support beam 17 are rotatably mounted with the second front sprocket 20 and the second rear sprocket 21. The second chain 11 is fitted onto the second front sprocket 20, the second rear sprocket 21, and the same-side drive sprocket 9. The chain segment of the first chain 10 between the first front sprocket 18 and the first rear sprocket 19 is the first clamping segment 12, and the chain segment of the second chain 11 between the second front sprocket 20 and the second rear sprocket 21 is the second clamping segment 13.

[0028] A plow blade 32 assembly is installed at the front end of the frame 1 between the first clamping section 12 and the second clamping section 13. The plow blade 32 assembly includes two plow blades 32 arranged in a V-shape. The plow blades 32 are fixedly mounted on the front crossbeam 2 by a support rod, which is vertically downward. The support rod is perpendicular to the traction seat. The support rod includes a thick rod 33 and a thin rod 34. The bottom of the thick rod 33 has a telescopic hole for the thin rod 34 to be inserted. The surface of the thick rod 33 has multiple fastening threaded holes, and fastening bolts 47 are installed in the fastening threaded holes. The fastening bolts 47 are inserted into the fastening threaded holes and abut against the thin rod 34. By setting the thick rod 33 and the thin rod 34, the support rod can be made telescopic. By screwing the fastening bolts 47 into the fastening threaded holes and abutting against the thin rod 34, the thick rod 33 and the thin rod 34 can be relatively fixed.

[0029] The frame 1 is also equipped with a vibration assembly; the vibration assembly includes a vibration plate 24 and a vibration sprocket 25 rotatably mounted on the first support beam 16. The vibration sprocket 25 meshes with the first chain 10. A drive rod 26 is mounted on the bottom surface of the vibration sprocket 25. The drive rod 26 is eccentrically positioned with the vibration sprocket 25. A vibration arm 27 is rotatably mounted on the lower side of the drive rod 26. A connecting lug 28 is mounted on the vibration plate 24. The vibration arm 27 is rotatably connected to the connecting lug 28. A rotating shaft 29 is mounted on the first support beam 16. One end of the vibration plate 24 is rotatably connected to the rotating shaft 29.

[0030] In this invention, during vibration, the first chain 10 drives the vibration sprocket 25 to rotate. During the rotation of the vibration sprocket 25, the drive rod 26 will rotate eccentrically. During the eccentric rotation of the drive rod, the vibration arm 27 is rotatably connected to the lower side of the drive rod, causing the drive rod to move the vibration arm 27 back and forth. Since the front end of the vibration arm 27 is rotatably connected to the vibration plate 24 through the connecting lug 28, and one end of the vibration plate 24 is rotatably connected to the first support beam 16 through the rotating shaft 29, the vibration arm 27 drives the vibration plate 24 to reciprocate around the rotating shaft 29. During the reciprocating rotation of the vibration plate 24, the peanut vines between the first clamping section 12 and the second clamping section 13 are vibrated, and the soil on the peanut vines is shaken off during the vibration process.

[0031] A support leg 14 is also installed on one side of the frame 1, and a roller 15 is installed at the bottom of the support leg 14. The support leg 14 is a hand-cranked lifting support leg, and the support leg 14 can be raised and lowered by a crank on it, thereby raising and lowering the roller 15.

[0032] The two active bevel gears 6 are respectively disposed on the outer side of the corresponding passive bevel gears 8; the two active bevel gears 6 are respectively disposed on the inner side of the corresponding passive bevel gears 8. By changing the relative positions of the active bevel gears 6 and the passive bevel gears 8, this invention can be applied to the drive shafts of tractors with different steering directions.

[0033] The second rear sprocket 21 extends further back than the first rear sprocket 19. A second guide plate 22, which is inclined to the left relative to the second support beam 17, is installed at the rear end of the second support beam 17. A first guide plate 23, which is inclined to the left relative to the first support beam 16, is installed at the rear end of the first support beam 16. The length of the second guide plate 22 is greater than that of the first guide plate 23.

[0034] The first support beam 16 has a first limiting roller 30 rotatably mounted on one side of the first clamping section 12, and the first limiting roller 30 is in contact with the first clamping section 12. The second support beam 17 has a second limiting roller 31 rotatably mounted on one side of the second clamping section 13, and the second limiting roller 31 is in contact with the second clamping section 13. By setting the first limiting roller 30 and the second limiting roller 31, this utility model allows the first clamping section 12 and the second clamping section 13 to fit together better, with the first clamping section 12 and the second clamping section 13 positioned between the first limiting roller 30 and the second limiting roller 31.

[0035] The working principle of this utility model: During peanut harvesting, the traction frame 3 is first installed on the tractor, and the main drive wheel 5 on the main drive shaft 4 is connected to the output shaft of the tractor via a chain. When the frame 1 moves forward driven by the tractor, the V-shaped plow blades 32 on both sides of the front end of the frame 1 insert into the soil. At the same time, the main drive wheel 5 drives the first chain 10 and the second chain 11 on both sides to rotate. The first chain 10 and the second chain 11 rotate in opposite directions. The plow blades 32 on both sides scoop up the peanuts from the soil. The scooped-up peanut vines enter between the first clamping section 12 and the second clamping section 13, and are clamped and moved forward by the first clamping section 12 and the second clamping section 13. Since the first clamping section 12 and the second clamping section 13 are both inclined to the left relative to the front crossbeam 2, and Both the first clamping section 12 and the second clamping section 13 are inclined upward relative to the front crossbeam 2, so the peanut vine is moved to the upper left. After the peanut vine moves out from between the first clamping section 12 and the second clamping section 13, the upper side of the peanut vine will enter between the first guide plate 23 and the second guide plate 22. Since both the first guide plate 23 and the second guide plate 22 are inclined to the left, and since the second guide plate 22 is in front of the first guide plate 23 and the length of the second guide plate 22 is greater than that of the first guide plate 23, the second guide plate 22 will contact the upper side of the peanut vine and guide the peanut vine to move to the left. During the contact between the second guide plate 22 and the upper side of the peanut vine, the second guide plate 22 will cause the peanut vine to tilt, thereby causing the peanut vine to fall to the ground on the left.

Claims

1. A peanut strip harvester, characterized in that, The system includes a frame (1), which includes a front crossbeam (2). A traction frame (3) is installed at the front end of the front crossbeam (2). A horizontally arranged main drive shaft (4) is rotatably installed on the top of the front crossbeam (2). A main drive wheel (5) is installed on the main drive shaft (4). Active bevel gears (6) are installed on both sides of the main drive shaft (4). Vertically arranged side drive shafts (7) are rotatably installed on both sides of the front crossbeam (2). A passive bevel gear (8) that cooperates with the active bevel gear (6) is installed on the top of the side drive shaft (7). An active sprocket (9) is installed at the bottom of the side drive shaft (7). The two active sprockets (9) are respectively connected to There are a first chain (10) and a second chain (11) mounted on the frame (1). The first chain (10) and the second chain (11) are respectively provided with a first clamping section (12) and a second clamping section (13) that fit together. The first clamping section (12) and the second clamping section (13) are both inclined upward relative to the front crossbeam (2). A plow blade (32) assembly is installed at the front end of the frame (1) between the first clamping section (12) and the second clamping section (13). A vibrating assembly is also installed on the frame (1). A support leg (14) is also installed on one side of the frame (1), and a roller (15) is installed at the bottom of the support leg (14).

2. The peanut strip harvester according to claim 1, characterized in that, The active bevel gears (6) on both sides are respectively located on the outside of the corresponding passive bevel gears (8).

3. The peanut strip harvester according to claim 1, characterized in that, The active bevel gears (6) on both sides are respectively located inside the corresponding passive bevel gears (8).

4. The peanut strip harvester according to claim 1, characterized in that, The frame (1) also includes a first support beam (16) and a second support beam (17) installed on the left and right sides of the rear end of the front crossbeam (2). The front end and the rear end of the first support beam (16) are respectively rotatably mounted with a first front sprocket (18) and a first rear sprocket (19). The first chain (10) is fitted on the first front sprocket (18), the first rear sprocket (19) and the same side drive sprocket (9). The front end and the rear end of the second support beam (17) are rotatably mounted with a second front sprocket (20) and a second rear sprocket (21). The second chain (11) is fitted on the second front sprocket (20), the second rear sprocket (21) and the same side drive sprocket (9). The chain segment of the first chain (10) between the first front sprocket (18) and the first rear sprocket (19) is the first clamping segment (12). The chain segment of the second chain (11) between the second front sprocket (20) and the second rear sprocket (21) is the second clamping segment (13).

5. The peanut strip harvester according to claim 4, characterized in that, The second rear sprocket (21) extends beyond the first rear sprocket (19). The rear end of the second support beam (17) is equipped with a second guide plate (22) that is inclined to the left relative to the second support beam (17). The rear end of the first support beam (16) is equipped with a first guide plate (23) that is inclined to the left relative to the first support beam (16). The length of the second guide plate (22) is greater than that of the first guide plate (23).

6. The peanut strip harvester according to claim 4, characterized in that, The vibrating assembly includes a vibrating plate (24) and a vibrating sprocket (25) rotatably mounted on a first support beam (16). The vibrating sprocket (25) meshes with a first chain (10). A drive rod (26) is mounted on the bottom surface of the vibrating sprocket (25). The drive rod (26) is eccentrically set with the vibrating sprocket (25). A vibrating arm (27) is rotatably mounted on the lower side of the drive rod (26). A connecting ear (28) is mounted on the vibrating plate (24). The vibrating arm (27) is rotatably connected to the connecting ear (28). A rotating shaft (29) is mounted on the first support beam (16). One end of the vibrating plate (24) is rotatably connected to the rotating shaft (29).

7. The peanut strip harvester according to claim 4, characterized in that, The first support beam (16) has a first limiting roller (30) rotatably mounted on one side of the first clamping section (12), and the first limiting roller (30) is in contact with the first clamping section (12). The second support beam (17) has a second limiting roller (31) rotatably mounted on one side of the second clamping section (13), and the second limiting roller (31) is in contact with the second clamping section (13).

8. The peanut strip harvester according to claim 4, characterized in that, The plow blade (32) assembly includes two plow blades (32) arranged in a V-shape. The plow blades (32) are fixedly mounted on the front crossbeam (2) by a support rod. The support rod is set vertically downward. The support rod is set perpendicular to the traction seat. The support rod includes a thick rod (33) and a thin rod (34). The bottom of the thick rod (33) is provided with a telescopic hole for the thin rod (34) to be inserted. The surface of the thick rod (33) is provided with multiple fastening threaded holes. Fastening bolts (47) are installed on the fastening threaded holes. The fastening bolts (47) are inserted into the fastening threaded holes and abut against the thin rod (34).

9. The peanut strip harvester according to claim 1, characterized in that, The outrigger (14) is a hand-cranked lifting outrigger, and the main drive shaft (4) is rotatably mounted on the front crossbeam (2) through the bearing seats (35) on both sides; the first clamping section (12) and the second clamping section (13) are both tilted to the left relative to the front crossbeam (2).

10. The peanut strip harvester according to claim 1, characterized in that, The main drive wheel (5) is a sprocket. A clutch structure is installed on one side of the main drive wheel (5) on the main drive shaft (4). The main drive wheel (5) is rotatably mounted on the main drive shaft (4) via bearings. The clutch structure includes a sliding shaft (36) and a lever (37). The sliding shaft (36) is slidably mounted on the main drive shaft (4). A transmission key (38) is installed on the main drive shaft (4). A keyway for inserting the transmission key (38) is opened on the inner wall of the sliding shaft (36). A baffle (39) is installed on one side of the transmission key (38) on the main drive shaft (4). A gap is formed between the baffle (39) and the sliding shaft (36). A spring (40) is installed. Transmission grooves (41) that can mesh with each other are respectively opened on the opposite surfaces of the sliding shaft (36) and the main drive wheel (5). An annular groove (42) is also opened on the sliding shaft (36). One end of the lever (37) is inserted into the annular groove (42). A rotating hole is opened on the lever (37). A lead screw (43) inserted into the rotating hole is installed on the frame (1). A fastening nut (44) is installed on the lead screw (43). A support plate (45) is installed at the end of the lever (37) on the frame (1). Limiting grooves (46) for the lever (37) to be inserted are respectively opened on the left and right sides of the support plate (45).

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