Seedling pulling mechanism

Abstract

The utility model discloses a seedling pulling mechanism which is characterized in that at least two seedling clamping rollers are fixedly mounted on a roller shaft, a left end pressure plate is fixedly mounted at the left end of the roller shaft, a right end pressure plate is fixedly mounted at the right end of the roller shaft, the seedling clamping rollers are positioned between the left end pressure plate and the right end pressure plate, and circular fixed seedling clamping plates are fixed on the outer circular surfaces of the seedling clamping rollers; a guide groove is formed in the seedling clamping roller; at least two seedling clamping push rods are installed in the seedling clamping roller, at least two reset springs and at least two movable seedling clamping plates are installed on the seedling clamping push rods, each movable seedling clamping plate is in sliding fit with the corresponding seedling clamping push rod, and the two ends of the reset spring at the left end abut against the position between the corresponding movable seedling clamping plate and the corresponding pressing disc at the left end respectively. The two ends of the middle end reset spring abut against the position between every two adjacent movable seedling clamping plates, and the movable seedling clamping plates are located in the guide grooves; a rolling ball retaining sleeve and a cylindrical cam are installed on the right side of the right-end pressing disc, the rolling ball retaining sleeve is fixedly connected with the right-end pressing disc, a rolling ball is installed in the rolling ball retaining sleeve, the rolling ball is of a spherical structure and abuts against the cam contour surface of the cylindrical cam, and the rolling ball retaining sleeve and the cylindrical cam can be matched in a relatively rotating mode; the right end of the seedling clamping push rod abuts against the rolling ball. According to the utility model, the problems of aggravated abrasion of the cam profile surface of the cylindrical cam and autorotation of the seedling clamping push rod are solved, the reliability and safety of equipment are improved, and the service life of the equipment is prolonged. And a modular structure is adopted, so that the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of machinery, and particularly relates to a seedling pulling mechanism. Background Art

[0002] The prior art patent CN114568082A discloses a rice transplanter. The seedling pulling mechanism adopted by the rice transplanter includes a seedling pulling mechanism bracket, a cam disc, 16 seedling dividing grid plates, and a roller; the cam disc and the seedling dividing grid plates are fixed on the seedling pulling mechanism bracket, and the roller is rotatably installed on the seedling pulling mechanism bracket. The seedling clamping assembly includes a sliding rod, 5 clamping plate sliding sleeves, and 5 return springs. The clamping plate sliding sleeves are installed on the sliding rod at intervals, and a roller is installed at the end of the sliding rod, and the roller abuts against the cam disc. The prior art has the following technical defects: First, since the cam disc of this technology is a cylindrical cam, the cylindrical cam is a fixed part, and the roller can only rotate around its own axis. The axis of the roller intersects with the axis of the roller. When the roller drives the sliding rod to rotate around the axis of the roller, the roller not only rotates around its own axis, but also revolves around the axis of the roller. There is not only rolling friction but also sliding friction between the mating surface of the roller and the cylindrical cam, which aggravates the wear of the mating surface of the roller and the cylindrical cam. In addition, the reaction force of the cylindrical cam on the sliding rod will cause the sliding rod to rotate by itself. Second, the roller is an integral structure, which is difficult to process and assemble, and the manufacturing cost is high. Summary of the Utility Model

[0003] In view of this, the utility model provides a seedling pulling mechanism, which solves the problems of aggravated wear of the cam profile surface of the cylindrical cam and self-rotation of the seedling clamping push rod, improves the reliability and safety of the equipment, and prolongs the service life of the equipment. The modular structure is adopted to reduce the manufacturing cost.

[0004] On the one hand, the utility model provides a seedling pulling mechanism, on which at least two seedling clamping rollers are fixedly installed on a roller shaft, a left end pressing disc is fixedly installed at the left end of the roller shaft, a right end pressing disc is fixedly installed at the right end of the roller shaft, the seedling clamping rollers are located between the left end pressing disc and the right end pressing disc, a circular fixed seedling clamping plate is fixed on the outer circumferential surface of the seedling clamping roller, and a guide groove is opened on the seedling clamping roller; at least two seedling clamping push rods are installed in the seedling clamping roller, at least two return springs and at least two moving seedling clamping plates are installed on the seedling clamping push rods, each moving seedling clamping plate is slidably matched with the seedling clamping push rod, the two ends of the left end return spring respectively abut between the moving seedling clamping plate and the left end pressing disc, the two ends of the middle end return spring respectively abut between two adjacent moving seedling clamping plates, and the moving seedling clamping plate is located in the guide groove; a ball retaining sleeve and a cylindrical cam are installed on the right side of the right end pressing disc, the ball retaining sleeve is fixedly connected with the right end pressing disc, balls are installed in the ball retaining sleeve, the balls are spherical structures, the balls abut against the cam profile surface of the cylindrical cam, the ball retaining sleeve and the cylindrical cam are rotatably matched with each other, the left end of the seedling clamping push rod is connected with the left end pressing disc, and the right end of the seedling clamping push rod abuts against the ball.

[0005] In order to achieve the processes of slow loosening, long loosening, rapid clamping, and slow seedling pulling, in a further technical solution, the cylindrical cam includes a disc and a cylinder. The cylinder is fixed on the disc and is coaxial with the disc. The cam profile surface includes a first curve profile surface, a second curve profile surface, a first plane profile surface, and a second plane profile surface. The first curve profile surface, the second curve profile surface, and the first plane profile surface are located on the end surface of the cylinder, and the second plane profile surface is located on the surface of the disc. The first curve profile surface is used to push the seedling clamping push rod to move to the left against the elastic force of the return spring, slowly loosening the seedlings. The first plane profile surface is used to keep the seedlings in a completely loosened state. The second curve profile surface is used to move the seedling clamping push rod to the right under the action of the elastic force of the return spring, quickly clamping the seedlings. The second plane profile surface is used to keep the seedlings in a completely clamped state. The central angle R4 of the first plane profile surface is greater than the central angle R2 of the second plane profile surface, the central angle R3 of the first curve profile surface is more than twice the central angle R1 of the second curve profile surface, the central angle R2 of the second plane profile surface is greater than the central angle R3 of the first curve profile surface, and the height H1 of the cylinder is equal to the displacement stroke L1 of the moving seedling clamping plate.

[0006] In order to achieve the processes of slow loosening, long loosening, rapid clamping, and slow seedling pulling, in a further technical solution, the central angle R4 of the first plane profile surface is 150 - 170 degrees, the central angle R2 of the second plane profile surface is 90 - 100 degrees, the central angle R3 of the first curve profile surface is 20 - 30 degrees, and the central angle R1 of the second curve profile surface is 70 - 80 degrees. The sum of the central angle R4 of the first plane profile surface, the central angle R2 of the second plane profile surface, the central angle R3 of the first curve profile surface, and the central angle R1 of the second curve profile surface is 360 degrees.

[0007] In order to reduce the cam profile surface of the cylindrical cam, avoid the self-rotation of the seedling clamping push rod, improve the reliability and safety of the equipment, and extend the service life of the equipment, in a further technical solution, the ball retaining sleeve includes an inner ring and an outer ring. A ring groove is formed between the inner ring and the outer ring, and the cylinder is inserted into the ring groove. A cylindrical hole is opened between the inner ring and the outer ring, and an oil nozzle hole is opened on the outer ring. The oil nozzle hole is communicated with the cylindrical hole, and a lubricating oil nozzle is installed on the oil nozzle hole. The balls are located in the cylindrical hole, and the right end of the seedling clamping push rod is inserted into the cylindrical hole. The roller shaft is fixedly connected with the inner ring through a positioning pin.

[0008] In order to improve the seedling clamping efficiency, in a further technical solution, there are three seedling clamping push rods, and the three seedling clamping push rods are evenly arranged. Three cylindrical holes are opened between the inner ring and the outer ring, and three oil nozzle holes are opened on the outer ring. The three oil nozzle holes are respectively communicated with the three cylindrical holes.

[0009] In order to improve the sealing performance, in a further technical solution, a sealing ring is installed at the right end of the seedling clamping push rod. The right end of the seedling clamping push rod is inserted into the inner circle of the sealing ring, and the outer circle of the sealing ring is inserted into the right end pressing disc. The end surface of the sealing ring is matched with the end surface of the ball retaining sleeve to form a plane seal.

[0010] In a further technical solution, in order to achieve relative rotation between the roller shaft and the cylindrical cam, a bearing housing is installed at the right end of the roller shaft, and the cylindrical cam is connected to the bearing housing.

[0011] In a further technical solution, in order to improve the seedling clamping efficiency, there are 21 seedling clamping rollers. Three fixing rods are fixed inside the 21 seedling clamping rollers. Both ends of the three fixing rods are respectively connected and fixed to the left end pressing plate and the right end pressing plate, thereby connecting and fixing the 21 seedling clamping rollers.

[0012] In a further technical solution, in order to improve the seedling clamping efficiency, 7 return springs and 7 moving seedling clamping plates are installed on the seedling clamping push rod.

[0013] The beneficial effects of a seedling pulling mechanism of the present utility model compared with the prior art are as follows:

[0014] The present utility model uses multiple seedling clamping rollers assembled with each other. According to actual needs, the corresponding number of seedling clamping rollers is assembled. Each seedling clamping roller has the same structure, realizing modular production, and reducing production costs and maintenance costs.

[0015] In the present utility model, balls are installed in the ball retaining sleeve. The balls are spherical structures, and the balls abut against the cam profile surface of the cylindrical cam. The balls can rotate 360 degrees. There is only rolling friction between the balls and the cam profile surface of the cylindrical cam, and there is no sliding friction, reducing the wear of the cam profile surface of the cylindrical cam, avoiding the self-rotation of the seedling clamping push rod, improving the reliability and safety of the equipment, and extending the service life of the equipment.

[0016] The first curve profile surface of the present utility model is used to overcome the elastic force of the return spring and push the seedling clamping push rod to move to the left, slowly releasing the seedlings; the first plane profile surface is used for the seedlings to remain completely released; the second curve profile surface is used to make the seedling clamping push rod move to the right under the action of the elastic force of the return spring, quickly clamping the seedlings; the second plane profile surface is used for the seedlings to remain completely clamped, realizing the processes of slow release, long release, quick clamping, and slow seedling pulling, ensuring the accuracy and reliability of the seedling pulling process, quickly picking and slowly releasing, and not damaging the seedlings. Description of the Drawings

[0017] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0018] Figure 1 is a three-dimensional view of a seedling pulling mechanism of the present utility model;

[0019] Figure 2 is Figure 1 the front view of

[0020] Figure 3 View A-A sectional view of Figure 2 ;

[0021] Figure 4 View left view of Figure 2 ;

[0022] Figure 5 Schematic diagram of cylindrical cam of Figure 1 ;

[0023] Figure 6 View top view of Figure 5 ;

[0024] Figure 7 View front view of Figure 5 ;

[0025] Figure 8 Schematic diagram of ball retaining sleeve of Figure 1 ;

[0026] Figure 9 View top view of Figure 8 ;

[0027] Figure 10 View B-B sectional view of Figure 9 ; Specific embodiments

[0028] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] As shown in Figure 1 and Figure 2 and Figure 3 and Figure 4 , the present utility model preferably provides a seedling pulling mechanism. Twenty-one seedling clamping roller cylinders 6 are fixedly installed on a roller shaft 1. A left end pressing plate 7 is fixedly installed at the left end of the roller shaft 1, and a right end pressing plate 11 is fixedly installed at the right end of the roller shaft 1. The twenty-one seedling clamping roller cylinders 6 are located between the left end pressing plate 7 and the right end pressing plate 11. A circular fixed seedling clamping plate 61 is fixed on the outer circumferential surface of the seedling clamping roller cylinder 6, and a guide groove 60 is provided on the seedling clamping roller cylinder 6. Three fixing rods 9 are fixed inside the twenty-one seedling clamping roller cylinders 6. Both ends of the three fixing rods 9 are respectively connected and fixed to the left end pressing plate 7 and the right end pressing plate 11, connecting and fixing the twenty-one seedling clamping roller cylinders 6. The twenty-one seedling clamping roller cylinders 6 can pull 21 seedlings when rotating one week. The present utility model adopts multiple seedling clamping roller cylinders 6 assembled with each other, and assembles the corresponding number of seedling clamping roller cylinders 6 according to actual needs. Each seedling clamping roller cylinder 6 has the same structure, realizing modular production and reducing the production cost and maintenance cost.

[0030] There are 3 clamping seedling push rods 8 installed in the clamping seedling roller 6. The 3 clamping seedling push rods 8 are evenly arranged, and the angular interval between the 3 clamping seedling push rods 8 is 120 degrees. There are 7 return springs 80 and 7 moving clamping seedling plates 81 installed on the clamping seedling push rod 8. Each moving clamping seedling plate 81 is in sliding fit with the clamping seedling push rod 8. The two ends of the left-end return spring 80 respectively abut between the moving clamping seedling plate 81 and the left-end pressure plate 7. The two ends of the middle-end return spring 80 respectively abut between two adjacent moving clamping seedling plates 81. The moving clamping seedling plate 81 is located in the guide groove 60. Rotating 120 degrees pulls out 7 seedlings, and rotating 360 degrees pulls out 21 seedlings.

[0031] As Figure 3 shown, a ball retaining sleeve 4 and a cylindrical cam 3 are installed on the right side of the right-end pressure plate 11. The ball retaining sleeve 4 is fixedly connected to the right-end pressure plate 11. There is a ball 10 installed in the ball retaining sleeve 4. The ball 10 is of a spherical structure. The ball 10 abuts against the cam profile surface of the cylindrical cam 3. The ball retaining sleeve 4 and the cylindrical cam 3 are rotatably and relatively fitted. The left end of the clamping seedling push rod 8 is connected to the left-end pressure plate 7, and the right end of the clamping seedling push rod 8 abuts against the ball 10. The ball 10 can rotate 360 degrees. There is only rolling friction between the ball 10 and the cam profile surface of the cylindrical cam 3, and there is no sliding friction, which reduces the wear of the cam profile surface of the cylindrical cam 3, avoids the self-rotation of the clamping seedling push rod, improves the reliability and safety of the equipment, and extends the service life of the equipment. A sealing ring 13 is installed at the right end of the clamping seedling push rod 8. The right end of the clamping seedling push rod 8 is inserted into the inner ring of the sealing ring 13, and the outer ring of the sealing ring 13 is inserted into the right-end pressure plate 11. The end face of the sealing ring 13 is matched with the end face of the ball retaining sleeve 4 to form a plane seal. A bearing seat 2 is installed at the right end of the roller shaft 1, and the cylindrical cam 3 is connected to the bearing seat 2.

[0032] As Figure 5 and Figure 6 and Figure 7As shown in the figure, the cylindrical cam 3 includes a disc 31 and a cylinder 30. The cylinder 30 is fixed on the disc 31 and is coaxial with the disc 31. The cam profile surface includes a first curve profile surface 300, a second curve profile surface 302, a first plane profile surface 301, and a second plane profile surface. The first curve profile surface 300, the second curve profile surface 302, and the first plane profile surface 301 are located on the end surface of the cylinder 30, and the second plane profile surface is located on the surface of the disc 31. The first curve profile surface 300 is used to push the seedling clamping push rod 8 to move to the left against the elastic force of the return spring 80 and slowly release the seedlings. The first plane profile surface 301 is used to keep the seedlings in a completely released state. The second curve profile surface 302 is used to move the seedling clamping push rod 8 to the right under the action of the elastic force of the return spring 80 and quickly clamp the seedlings. The second plane profile surface is used to keep the seedlings in a completely clamped state. The central angle R4 of the first plane profile surface 301 is greater than the central angle R2 of the second plane profile surface. The central angle R3 of the first curve profile surface 300 is more than twice the central angle R1 of the second curve profile surface 302. The central angle R2 of the second plane profile surface is greater than the central angle R3 of the first curve profile surface 300. The height H1 of the cylinder 30 is equal to the displacement stroke L1 of the movable seedling clamping plate 81. The central angle R4 of the first plane profile surface 301 is 160 degrees, the central angle R2 of the second plane profile surface is 95 degrees, the central angle R3 of the first curve profile surface 300 is 25 degrees, and the central angle R1 of the second curve profile surface 302 is 80 degrees. The sum of the central angle R4 of the first plane profile surface 301, the central angle R2 of the second plane profile surface, the central angle R3 of the first curve profile surface 300, and the central angle R1 of the second curve profile surface 302 is 360 degrees. The processes of slow release, long release, quick clamping, and slow seedling pulling are realized, ensuring the accuracy and reliability of the seedling pulling process, quick picking and slow placing, and not damaging the seedlings.

[0033] As Figure 8 and Figure 9 and Figure 10 shown in the figure, the ball retaining sleeve 4 includes an inner ring 44 and an outer ring 43. An annular groove 40 is formed between the inner ring 44 and the outer ring 43, and the cylinder 30 is inserted into the annular groove 40. Three cylindrical holes 41 are opened between the inner ring 44 and the outer ring 43, and three oil nozzle holes 42 are opened on the outer ring 43. The oil nozzle holes 42 communicate with the cylindrical holes 41, and three lubricating oil nozzles 5 are installed on the three oil nozzle holes 42. Lubricating oil is injected into the cylindrical holes 41 through the three lubricating oil nozzles 5. The balls 10 are located in the cylindrical holes 41, and the right ends of the three seedling clamping push rods 8 are inserted into the three cylindrical holes 41. The roller shaft 1 is fixedly connected with the inner ring 44 through a positioning pin 12. It avoids the self-rotation of the seedling clamping push rod, improves the reliability and safety of the equipment, and extends the service life of the equipment.

[0034] The preferred working process of the seedling pulling mechanism of the present utility model is as follows: The roller shaft 1 drives 21 seedling clamping roller cylinders 6, seedling clamping push rods 8 and ball retaining sleeves 4 to rotate. The cylindrical cam 3 is fixed, and the ball 10 rolls on the cam profile surface. The ball 10 has a rolling friction relative to the right end of the seedling clamping push rod 8 and a rolling friction relative to the cam profile surface, without sliding friction, reducing the wear of the cam profile surface of the cylindrical cam 3, avoiding the self-rotation of the seedling clamping push rod, improving the reliability and safety of the equipment, and extending the service life of the equipment. The first curve profile surface 300 overcomes the elastic force of the return spring 80 to push the ball 10 and the seedling clamping push rod 8 to move to the left, the moving seedling clamping plate 81 moves to the left, and the gap between the moving seedling clamping plate 81 and the fixed seedling clamping plate 61 increases, and the seedling is slowly released to achieve the slow loosening process; then, the ball 10 is located on the first plane profile surface 301, and the seedling remains completely loose to achieve a long-term loose state; then, the ball 10 is located on the second curve profile surface 302, and under the action of the elastic force of the return spring 80, the seedling clamping push rod 8 moves to the right, the gap between the moving seedling clamping plate 81 and the fixed seedling clamping plate 61 decreases, and the seedling is quickly clamped to achieve the quick clamping process; finally, the roller shaft 1 continues to rotate, the ball 10 is located on the second plane profile surface, and the seedling remains completely clamped, and the seedling is slowly pulled out to ensure the accuracy and reliability of the seedling pulling process, quickly picking and slowly releasing, without damaging the seedling.

[0035] The technologies not described above are the common general knowledge of those skilled in the art. The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A seedling pulling mechanism, characterized in that, At least two seedling clamping rollers (6) are fixedly installed on the roller shaft (1). A left end pressing disc (7) is fixedly installed at the left end of the roller shaft (1), and a right end pressing disc (11) is fixedly installed at the right end of the roller shaft (1). The seedling clamping rollers (6) are located between the left end pressing disc (7) and the right end pressing disc (11). A circular fixed seedling clamping plate (61) is fixed on the outer circular surface of the seedling clamping roller (6), and a guide groove (60) is formed in the seedling clamping roller (6); at least two seedling clamping push rods (8) are installed in the seedling clamping roller (6), at least two return springs (80) and at least two moving seedling clamping plates (81) are installed on the seedling clamping push rods (8). Each moving seedling clamping plate (81) is slidably matched with the seedling clamping push rod (8). The two ends of the left end return spring (80) respectively abut between the moving seedling clamping plate (81) and the left end pressing disc (7), and the two ends of the middle end return spring (80) respectively abut between two adjacent moving seedling clamping plates (81). The moving seedling clamping plates (81) are located in the guide groove (60); a ball retaining sleeve (4) and a cylindrical cam (3) are installed on the right side of the right end pressing disc (11). The ball retaining sleeve (4) is fixedly connected with the right end pressing disc (11). A ball (10) is installed in the ball retaining sleeve (4). The ball (10) is of a spherical structure. The ball (10) abuts against the cam profile surface of the cylindrical cam (3). The ball retaining sleeve (4) and the cylindrical cam (3) are rotatably matched relative to each other. The left end of the seedling clamping push rod (8) is connected with the left end pressing disc (7), and the right end of the seedling clamping push rod (8) abuts against the ball (10).

2. The seedling pulling mechanism according to claim 1, wherein, The cylindrical cam (3) includes a disc (31) and a cylinder (30). The cylinder (30) is fixed on the disc (31), and the cylinder (30) and the disc (31) are coaxial; the cam profile surface includes a first curve profile surface (300), a second curve profile surface (302), a first plane profile surface (301), and a second plane profile surface. The first curve profile surface (300), the second curve profile surface (302), and the first plane profile surface (301) are located on the end face of the cylinder (30), and the second plane profile surface is located on the surface of the disc (31); the first curve profile surface (300) is used to overcome the elastic force of the return spring (80) to push the seedling clamping push rod (8) to move to the left and slowly release the seedlings; the first plane profile surface (301) is used for the seedlings to remain in a completely released state; the second curve profile surface (302) is used to make the seedling clamping push rod (8) move to the right under the action of the elastic force of the return spring (80) and quickly clamp the seedlings; the second plane profile surface is used for the seedlings to remain in a completely clamped state; the central angle R4 of the first plane profile surface (301) is greater than the central angle R2 of the second plane profile surface, the central angle R3 of the first curve profile surface (300) is more than twice the central angle R1 of the second curve profile surface (302), the central angle R2 of the second plane profile surface is greater than the central angle R3 of the first curve profile surface (300), and the height H1 of the cylinder (30) is equal to the displacement stroke L1 of the moving seedling clamping plate (81).

3. The seedling pulling mechanism according to claim 2, wherein, The central angle R4 of the first planar contour surface (301) is 150 - 170 degrees, the central angle R2 of the second planar contour surface is 90 - 100 degrees, the central angle R3 of the first curved contour surface (300) is 20 - 30 degrees, and the central angle R1 of the second curved contour surface (302) is 70 - 80 degrees; the sum of the central angle R4 of the first planar contour surface (301), the central angle R2 of the second planar contour surface, the central angle R3 of the first curved contour surface (300), and the central angle R1 of the second curved contour surface (302) is 360 degrees.

4. The seedling pulling mechanism according to claim 2, wherein, The ball retaining sleeve (4) includes an inner ring (44) and an outer ring (43). An annular groove (40) is formed between the inner ring (44) and the outer ring (43), and a cylinder (30) is inserted into the annular groove (40); a cylindrical hole (41) is provided between the inner ring (44) and the outer ring (43), and an oil nozzle hole (42) is provided on the outer ring (43). The oil nozzle hole (42) communicates with the cylindrical hole (41), and a lubricating oil nozzle (5) is installed on the oil nozzle hole (42); the balls (10) are located in the cylindrical hole (41), and the right end of the seedling clamping push rod (8) is inserted into the cylindrical hole (41); the roller shaft (1) is fixedly connected to the inner ring (44) through a positioning pin (12).

5. The seedling pulling mechanism according to claim 4, characterized in that, There are three seedling clamping push rods (8), and the three seedling clamping push rods (8) are evenly arranged; three cylindrical holes (41) are provided between the inner ring (44) and the outer ring (43), and three oil nozzle holes (42) are provided on the outer ring (43). The three oil nozzle holes (42) communicate with the three cylindrical holes (41) respectively.

6. The seedling pulling mechanism according to claim 5, wherein, A sealing ring (13) is installed at the right end of the seedling clamping push rod (8). The right end of the seedling clamping push rod (8) is inserted into the inner circle of the sealing ring (13), and the outer circle of the sealing ring (13) is inserted into the right end pressing disc (11). The end face of the sealing ring (13) cooperates with the end face of the ball retaining sleeve (4) to form a planar seal.

7. The seedling pulling mechanism according to claim 6, characterized in that, A bearing seat (2) is installed at the right end of the roller shaft (1), and the cylindrical cam (3) is connected to the bearing seat (2).

8. The seedling pulling mechanism according to claim 1, characterized in that, There are 21 seedling clamping rollers (6). Three fixing rods (9) are fixed in the 21 seedling clamping rollers (6). Both ends of the three fixing rods (9) are respectively connected and fixed to the left end pressing disc (7) and the right end pressing disc (11), connecting and fixing the 21 seedling clamping rollers (6).

9. The seedling pulling mechanism according to claim 1, characterized in that, Seven return springs (80) and seven movable seedling clamping plates (81) are installed on the seedling clamping push rod (8).

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