A clean bench for vaccine production

Abstract

The present invention relates to the technical field of clean benches, and discloses a clean bench for vaccine production, including a table body, a table top, a back plate and a top plate connected to the table body, a lifting panel connected to the top plate, a germicidal lamp arranged on the table top, the germicidal lamp slidably connected to the back plate, a slide slot 1 and a slide slot 2 are provided on the top plate, a trachea is connected to the slide slot 2, a lifting rod is slidably connected to the top plate, a connecting strip is connected to the upper end of the lifting rod, a spring 1 is connected between the lower end of the connecting strip and the upper end of the top plate, a limited inclined block is connected to the lower end of the lifting rod, and a sliding frame is slidably connected to the slide slot 1. The present invention cooperates with the germicidal lamp through the folding plate and the germicidal lamp, that is, when the equipment is running, the germicidal lamp can push the sealing plate to open, and at this time the germicidal lamp can irradiate toward the operating table top. On the contrary, after the equipment is used, the structure at the air duct can be irradiated by moving the germicidal lamp, thereby improving the sterilization effect at the air duct connection and ensuring the cleanliness in the clean bench.

Description

Technical Field

[0001] The invention relates to the technical field of super clean benches, in particular to a super clean bench for vaccine production. Background Art

[0002] The clean bench is a general-purpose local purification equipment for single-person operation. The airflow form is vertical laminar flow and horizontal laminar flow. It can create a local high-cleanliness air environment. It is an ideal special equipment for scientific research, pharmaceuticals, medical care, electronic optical instruments and other industries.

[0003] In order to achieve aseptic production during vaccine production, vaccine production is often carried out in a clean bench. Traditional clean benches rely on a high-efficiency filtration structure on the top to achieve a wind direction movement process of supplying air from the top and discharging air from the side, ensuring that external pollutants cannot enter the clean bench when the experimenter is operating. In order to improve the cleanliness, an ultraviolet sterilization lamp is added inside the clean bench during the experiment, and the sterilization lamp is used to irradiate the operating table surface to further improve the cleanliness during the operation. Since the clean bench supplies air from the outside, that is, the air duct above the clean bench is connected to the outside, regardless of whether the equipment is in use or not, the ventilation duct is connected to the outside, making the equipment When the equipment is not in use, pollutants will still adhere to the filter structure of the clean bench. Although it will not affect the use of the clean bench in the initial practical stage, it will cause pollution to the filter structure in the long run and increase the replacement cycle of the filter structure. At the same time, the structure of the sterilization lamp inside the clean bench is fixed, and the sterilization light source in a single fixed position will have the problem of sterilization dead corners. Since the opening and closing of the sterilization lamp can be easily understood by observation, and the fan inside the filter structure is installed inside the equipment, the operator is prone to turn off the sterilization lamp while the fan is not turned off, which increases the problem of incomplete sterilization inside the clean bench and the hidden danger of reduced equipment durability.

[0004] Based on this, a clean bench for vaccine production is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a clean bench for vaccine production in order to solve the above problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The utility model discloses a superclean bench for vaccine production, comprising a bench body, a bench top, a back plate and a top plate connected to the bench body, a lifting panel connected to the top plate, a germicidal lamp is arranged on the bench top, the germicidal lamp is slidably connected to the back plate, a slide groove 1 and a slide groove 2 are provided on the top plate, an air pipe is connected to the slide groove 2, a lifting rod is slidably connected to the top plate, the upper end of the lifting rod is connected to a connecting strip, a spring 1 is connected between the lower end of the connecting strip and the upper end of the top plate, the lower end of the lifting rod is connected to a limited inclined block, a sliding frame is slidably connected to the slide groove 1, a hoop is connected to the hoop, a folding plate is connected to the folding plate, a sealing plate is connected to the folding plate, and the sealing plate is slidably connected to the slide groove 2, one end of the hoop is connected to a spring 3, and the other end of the spring 3 is connected to a push plate, one side of the push plate is connected to a center column, the outer side of the center column is connected to a bottom oblique block, and an inclined groove is provided on the folding plate;

[0008] The lower end of the top plate is connected to a cylinder column, a reset cylinder is connected to the cylinder column, a second spring is connected between the cylinder column and the folding plate, and a moving mechanism for driving the germicidal lamp to move is connected to the back plate.

[0009] Preferably, a guide rod is connected to one side of the cylinder column, the other end of the guide rod is connected to the folding plate through, and the two spring sleeves are arranged on the guide rod.

[0010] Preferably, the moving mechanism includes a slider, a lifting bar is provided on one side of the back plate, the slider is slidably connected to the lifting bar, end teeth are connected at both ends of the lifting bar, the lifting bar is slidably connected to one side of the back plate, an L-groove is provided on the back plate, a connecting rod is slidably connected to the L-groove, a gear ring is connected to the connecting rod, a traction cylinder is connected to the outer side of the connecting rod, and the connecting rod is rotatably connected to the slider.

[0011] Preferably, an inner groove is formed on the lifting strip, and one end of the sliding block is slidably connected in the inner groove.

[0012] Preferably, a slide bar is connected to one side of the back plate, a slide clamp is connected to one side of the lifting bar, and the slide clamp is slidably connected to the slide bar.

[0013] Preferably, four slide bars are provided, and the four slide bars are symmetrically and vertically connected to one side of the back plate, and four slide clamps are provided.

[0014] Preferably, a cam is connected to the connecting rod, a symmetrical rod is connected to the slider, an extrusion block is connected to the upper end of the symmetrical rod, a spring four is connected between the extrusion block and the slider, and the upper end of the extrusion block abuts against the lower end of the cam.

[0015] Preferably, a sleeve is connected to one side of the back plate, a cylinder sleeve is rotatably connected to the sleeve, the cylinder sleeve is connected to the outside of the traction cylinder, a traction ring is connected to the telescopic end of the traction cylinder, and the traction ring is sleeved on the connecting rod.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] 1. The present application adopts a folding plate structure, and utilizes the position of the folding plate to indicate the position of the sealing plate used to seal the air pipe, so that the operator can easily understand the opening and closing of the air pipe structure. The folding plate cooperates with the germicidal lamp, that is, when the equipment is running, the germicidal lamp can push the sealing plate to open, and at this time the germicidal lamp can irradiate toward the operating table. On the contrary, after the equipment is used, the structure at the air duct can be irradiated by moving the germicidal lamp to improve the sterilization effect at the air duct connection. At this time, after the germicidal lamp has been sterilized for a period of time, the sealing plate can be used to seal the air pipe by operating the reset cylinder to ensure the cleanliness of the clean bench.

[0018] 2. The present application adopts a toothed ring structure and utilizes the cooperation between the toothed ring and the end teeth so that when the toothed ring moves, the end teeth can mesh and the toothed ring in the moving state can rotate, thereby changing the irradiation range of the germicidal lamp. Changing the irradiation angle of the germicidal lamp coincides with the different irradiation requirements of the germicidal lamp set at the top and bottom, which greatly reduces the sterilization blind spot area of ​​the germicidal lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of one side of a clean bench provided according to an embodiment of the present invention is shown;

[0020] Figure 2 It shows a schematic structural diagram of the connection of a germicidal lamp provided according to an embodiment of the present invention;

[0021] Figure 3 It shows a schematic structural diagram of the connection of the lifting strips provided according to an embodiment of the present invention;

[0022] Figure 4 It shows a schematic structural diagram of a ferrule connection provided in an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of an exploded structure of a slider connection provided according to an embodiment of the present invention is shown.

[0024] Legend:

[0025] 1. Table body; 2. Table top; 3. Sterilization lamp; 4. Lifting panel; 5. Top plate; 6. Back plate; 7. L-slot; 8. Slideway 1; 9. Slideway 2; 10. Cylinder column; 11. Reset cylinder; 12. Sliding frame; 13. Hoop; 14. Folding plate; 15. Air pipe; 16. Connecting strip; 17. Lifting rod; 18. Spring 1; 19. Push plate; 20. Casing; 21. Cylinder sleeve; 22. Traction cylinder; 23 , slide bar; 24, lifting bar; 25, inner groove; 26, end teeth; 27, traction ring; 28, slider; 29, connecting rod; 30, extrusion block; 31, gear ring; 32, limit inclined block; 33, spring two; 34, guide rod; 35, center column; 36, bottom inclined block; 37, spring three; 38, inclined groove; 39, spring four; 40, symmetrical rod; 41, sliding clamp; 42, sealing plate; 43, cam. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-5 , the present invention provides a technical solution:

[0028] A clean bench for vaccine production includes a table body 1, a table top 2, a back plate 6 and a top plate 5 are connected to the table body 1, a lifting panel 4 is connected to the top plate 5, the table top 2, the back plate 6, the top plate 5 and the lifting panel 4 form a chamber for operation in the clean bench, and vaccine production can be operated in this space to greatly improve the cleanliness of the operating environment and avoid vaccine contamination. A germicidal lamp 3 is arranged on the table top 2, and the germicidal lamp 3 is a one-side opening irradiation structure, rather than a lamp tube-type wide-angle germicidal lamp 3. The germicidal lamp 3 at the irradiation angle has high light intensity, good sterilization effect, and a clear sterilization area. The germicidal lamp 3 is slidably connected to the back plate 6. The germicidal lamp 3 always remains parallel to the table 2 when moving, and the germicidal lamp 3 remains perpendicular to the back plate 6. A slide groove 1 8 and a slide groove 2 9 are opened on the top plate 5. There are four slide grooves 1 8 and two slide grooves 2 9. Two slide grooves 1 8 are symmetrically arranged on both sides of the slide groove 2 9. The slide groove 2 9 is connected with an air pipe 15. The air pipe 15 Four are provided, one end of the air pipe 15 is connected to the slide groove 2 9, a lifting rod 17 is slidably connected to the top plate 5, the upper end of the lifting rod 17 is connected to the connecting strip 16, a spring 18 is connected between the lower end of the connecting strip 16 and the upper end of the top plate 5, the lower end of the lifting rod 17 is connected to the limited inclined block 32, the slide groove 18 is slidably connected to the sliding frame 12, the lower end of the sliding frame 12 is connected to the hoop 13, the hoop 13 is connected to the folding plate 14, the folding plate 14 is connected to the sealing plate 42, and the sealing plate 42 is slidably connected to On the slide groove 2 9, the sealing plate 42 can achieve the effect of blocking the lower end of the air pipe 15 after moving to a specific position. One end of the hoop 13 is connected to the spring 37, and the other end of the spring 37 is connected to the push plate 19. One side of the push plate 19 is connected to the center column 35. The hoop 13 is sleeved on the outside of the center column 35. The outside of the center column 35 is connected to the bottom oblique block 36. The bottom oblique block 36 is provided with an inclined surface, which is inclined downward and faces the side of the inclined surface groove 38. The folding plate 14 is provided with an inclined surface groove 38;

[0029] The lower end of the top plate 5 is connected to a cylinder column 10, and a reset cylinder 11 is connected to the cylinder column 10. The telescopic end of the reset cylinder 11 is arranged opposite to the push plate 19. A spring 2 33 is connected between the cylinder column 10 and the folding plate 14. The back plate 6 is connected to a moving mechanism for driving the sterilization lamp 3 to move.

[0030] Specifically, Figure 4 As shown, a guide rod 34 is connected to one side of the cylinder column 10, and the other end of the guide rod 34 is connected to the folding plate 14. The second spring 33 is sleeved on the guide rod 34. By setting the guide rod 34, the second spring 33 is limited, and the second spring 33 can push the folding plate 14 to complete the reset.

[0031] Specifically, Figure 3 and Figure 5As shown, the moving mechanism includes a slider 28, a lifting bar 24 is provided on one side of the back plate 6, the slider 28 is slidably connected to the lifting bar 24, and end teeth 26 are connected to both ends of the lifting bar 24. The end teeth 26 structure can make the end teeth 26 and the gear ring 31 engage with each other after the connecting rod 29 moves, so that the connecting rod 29 rotates when moving, the lifting bar 24 is slidably connected to one side of the back plate 6, an L groove 7 is provided on the back plate 6, and the connecting rod 29 is slidably connected to the L groove 7, and the connecting rod 29 is connected to the gear ring 31. The outer side of the connecting rod 29 is connected to the traction cylinder 22, and the traction cylinder 22 plays a role in driving the connecting rod 29 to move. The connecting rod 29 is rotatably connected to the slider 28, that is, the slider 28 is sleeved on the connecting rod 29.

[0032] Specifically, Figure 3 As shown, an inner groove 25 is provided on the lifting bar 24, and one end of the slider 28 is slidably connected in the inner groove 25. By providing the inner groove 25, the stability of the slider 28 sliding along the lifting bar 24 is improved, and the connection between the slider 28 structure and the lifting bar 24 cannot be separated.

[0033] Specifically, Figure 3 and Figure 5 As shown, a slide bar 23 is connected to one side of the back panel 6, and a slide clamp 41 is connected to one side of the lifting bar 24. The slide clamp 41 is slidably connected to the slide bar 23, and the lifting bar 24 is slidably connected to the slide bar 23 through the slide clamp 41. The stability of the up and down movement of the lifting bar 24 is improved by setting the slide clamp 41 and the slide bar 23 structure.

[0034] Specifically, Figure 3 and Figure 5 As shown, four slide bars 23 are provided, and the four slide bars 23 are symmetrically and vertically connected to one side of the back plate 6. Four sliding clamps 41 are provided, and the slide bars 23 correspond to the sliding clamps 41 one by one, thereby ensuring that the lifting bar 24 remains horizontal and moves up and down.

[0035] Specifically, Figure 3 As shown, a cam 43 is connected to the connecting rod 29, a symmetrical rod 40 is connected to the slider 28, an extrusion block 30 is connected to the upper end of the symmetrical rod 40, a spring 39 is connected between the extrusion block 30 and the slider 28, and the upper end of the extrusion block 30 abuts against the lower end of the cam 43. The cam 43 is squeezed by the extrusion block 30 so that the cam 43 will not deflect, and during the movement of the connecting rod 29, the rotation angle of the germicidal lamp 3 will also be slightly corrected, so that the predetermined irradiation angle of the germicidal lamp 3 can be limited, thereby improving the accuracy of the sterilization range.

[0036] Specifically, Figure 3 and Figure 5As shown, a sleeve 20 is connected to one side of the back plate 6, and a cylinder sleeve 21 is rotatably connected to the sleeve 20. The cylinder sleeve 21 is connected to the outside of the traction cylinder 22. A traction ring 27 is connected to the telescopic end of the traction cylinder 22. The traction ring 27 is sleeved on the connecting rod 29. By providing the traction ring 27, the friction force of the traction cylinder 22 transmission is reduced, so that the connecting rod 29 is not easy to deflect. At the same time, the sleeve 20 structure is provided to improve the stability of the cylinder sleeve 21 connected and rotated therewith.

[0037] In summary, in the clean bench for vaccine production provided in this embodiment, when vaccine production is required, the operator needs to push the lifting panel 4 upward, at which time the structure on one side of the clean bench is opened, and then the traction cylinder 22 is started, and the traction cylinder 22 is contracted to pull the connecting rod 29 to slide on the L groove 7. When the connecting rod 29 drives the sterilization lamp 3 to rise in height, the cam 43 on the connecting rod 29 is limited by the extrusion block 30, so that the connecting rod 29 does not rotate. At this time, the lifting bar 24 rises in height, but the slider 28 does not slide along the inner groove 25.

[0038] When the connecting rod 29 slides to the horizontal part of the L groove 7, the lifting bar 24 stops rising in height, and the slider 28 starts to move toward both ends along the inner groove 25. At this time, the germicidal lamp 3 can push the folding plate 14 to move. During the initial horizontal movement of the germicidal lamp 3, the tooth ring 31 does not contact the end teeth 26. At this time, the germicidal lamp 3 maintains the initial irradiation angle due to the mutual limitation of the cam 43 and the extrusion block 30. When the tooth ring 31 contacts the end teeth 26, the connection is close to the table top 2 in the clean table. When the connecting rod 29 continues to move, the tooth ring 31 overcomes the resistance and rotates. At this time, the irradiation angle of the germicidal lamp 3 changes, and the transition is completed from the initial oblique upward irradiation to the final oblique downward irradiation.

[0039] In the initial stage, the germicidal lamp 3 is set to irradiate obliquely upward toward the lower end of the trachea 15. At this time, the clean bench is in an unused state. When the clean bench is in use, the germicidal lamp 3 is moved to a position near the top plate 5 in the clean bench. At this time, the irradiation angle of the germicidal lamp 3 is obliquely downward, and the germicidal lamp 3 is tilted to the middle position of the table 2. At this time, the operator is on the table 2, working, and the sterilization ranges of the two germicidal lamps 3 overlap in the middle position of the table 2, which greatly improves the sterilization effect and achieves a sterilization effect without dead angles.

[0040] When the germicidal lamp 3 moves horizontally, the germicidal lamp 3 can abut against the side of the folding plate 14 on which the inclined groove 38 is provided, so that the germicidal lamp 3 is used to push the hoop 13 to move. Since the folding plate 14, the hoop 13 and the sliding frame 12 are all fixedly connected, at this time, one end of the sliding frame 12 is stably slid in the slide groove 8, wherein a slope is provided on one side of the folding plate 14. When the slope contacts the limiting inclined block 32, the limiting inclined block 32 rises in height under the push. At this time, the lifting rod 17 rises in height, and the spring 18 structure is stretched to continue to push the folding plate 14. At this time, the limiting inclined block 32 is on the folding plate 14. The surface is scratched, and finally the folding plate 14 is separated from the limiting inclined block 32. At this time, the limiting inclined block 32 falls and returns to the initial position. At this time, the germicidal lamp 3 pushes the folding plate 14 to move to the maximum position. At this time, the germicidal lamp 3 also completes the angle deflection operation. At this time, the limiting inclined block 32 can limit the folding plate 14. When the germicidal lamp 3 is reset, the folding plate 14 will not move in the horizontal direction. When the germicidal lamp 3 pushes the folding plate 14 to move, the spring 2 33 structure is compressed. At this time, the folding plate 14 drives the sealing plate 42 to slide on the slide groove 2 9. At this time, the lower end of the air pipe 15 is in an open state, and normal ventilation can be achieved in this state;

[0041] Through the clean bench, the multi-angle irradiation requirements of the germicidal lamp 3 are met, wherein the traction cylinder 22 is controlled to extend or retract to any length, thereby changing the sterilization angle of the germicidal lamp 3, and ensuring that when the germicidal lamp 3 moves up, the air duct connected to the air pipe 15 must be opened, to avoid the operator's erroneous operation of only turning on the germicidal lamp 3 but not turning on the ventilation when working in the clean bench. At the same time, after the production operation is completed, the germicidal lamp 3 can be moved down, and the germicidal lamp 3 can irradiate the ventilation area above the clean bench. At this time, continuous ventilation is ensured after the operation. Since there is no operating equipment on the table 2, the germicidal lamp 3 does not need to perform sterilization operations on the table 2 at this time, and the germicidal lamp 3 moves to the bottom for practice to perform sterilization operations on the ventilation area. Industry, improve the sterilization efficiency of the ventilated area, and avoid the inability to fully complete the sterilization operation by relying solely on the high-efficiency filtering structure. Until the lifting panel 4 completes the closing of the clean bench, the reset cylinder 11 is extended, and the reset cylinder 11 is used to push the push plate 19 and the center column 35 to move. At this time, the center column 35 drives the bottom inclined block 36 to move, and the bottom inclined block 36 is used to contact the inclined groove 38 to make the folding plate 14 bend, forcing the folding plate 14 to separate from the limiting inclined block 32. At this time, the limiting inclined block 32 cancels the limit on the folding plate 14, and the spring 2 33 is used to push the folding plate 14 to reset. At this time, the sealing plate 42 is reset to ensure that the structure below the air pipe 15 is sealed, thereby preventing foreign matter from entering the clean bench and achieving a good isolation effect.

[0042] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A clean bench for vaccine production, comprising a bench body (1), characterized in that: The table body (1) is connected to a table top (2), a back plate (6) and a top plate (5); the top plate (5) is connected to a lifting panel (4); a germicidal lamp (3) is arranged on the table top (2); the germicidal lamp (3) is slidably connected to the back plate (6); a first slide groove (8) and a second slide groove (9) are provided on the top plate (5); an air pipe (15) is connected to the second slide groove (9); a lifting rod (17) is slidably connected to the top plate (5); the upper end of the lifting rod (17) is connected to a connecting strip (16); a spring (18) is connected between the lower end of the connecting strip (16) and the upper end of the top plate (5); and the lower end of the lifting rod (17) is connected to a A limiting inclined block (32), a sliding frame (12) is slidably connected to the first slide groove (8), a hoop (13) is connected to the lower end of the sliding frame (12), a folding plate (14) is connected to the hoop (13), a sealing plate (42) is connected to the folding plate (14), the sealing plate (42) is slidably connected to the second slide groove (9), one end of the hoop (13) is connected to a spring three (37), the other end of the spring three (37) is connected to a push plate (19), one side of the push plate (19) is connected to a center column (35), the outer side of the center column (35) is connected to a bottom inclined block (36), and an inclined groove (38) is provided on the folding plate (14); The lower end of the top plate (5) is connected to a cylinder column (10), a reset cylinder (11) is connected to the cylinder column (10), a second spring (33) is connected between the cylinder column (10) and the folding plate (14), and a moving mechanism for driving the sterilization lamp (3) to move is connected to the back plate (6); The germicidal lamp (3) is a structure with an opening on one side for irradiation, rather than a tube-type wide-angle germicidal lamp (3); The moving mechanism comprises a slider (28), a lifting bar (24) is provided on one side of the back plate (6), the slider (28) is slidably connected to the lifting bar (24), the two ends of the lifting bar (24) are connected to end teeth (26), the end teeth (26) structure can make the end teeth (26) and the toothed ring (31) mesh with each other after the connecting rod (29) moves, the lifting bar (24) is slidably connected to one side of the back plate (6), the back plate (6) is provided with an L groove (7), the L groove (7) is slidably connected to the connecting rod (29), the connecting rod (29) is connected to the toothed ring (31), the outer side of the connecting rod (29) is connected to a traction cylinder (22), and the connecting rod (29) is rotatably connected to the slider (28).

2. The clean bench for vaccine production according to claim 1, characterized in that: A guide rod (34) is connected to one side of the cylinder column (10), and the other end of the guide rod (34) is connected to the folding plate (14) through the other end, and the second spring (33) is sleeved on the guide rod (34).

3. The clean bench for vaccine production according to claim 1, characterized in that: The lifting strip (24) is provided with an inner groove (25), and one end of the sliding block (28) is slidably connected in the inner groove (25).

4. The clean bench for vaccine production according to claim 1, characterized in that: One side of the back plate (6) is connected to a slide bar (23), one side of the lifting bar (24) is connected to a slide clamp (41), and the slide clamp (41) is slidably connected to the slide bar (23).

5. The clean bench for vaccine production according to claim 4, characterized in that: Four slide bars (23) are provided, and the four slide bars (23) are symmetrically and vertically connected to one side of the back plate (6). Four slide clamps (41) are provided.

6. The clean bench for vaccine production according to claim 1, characterized in that: The connecting rod (29) is connected to a cam (43), the slider (28) is connected to a symmetrical rod (40), the upper end of the symmetrical rod (40) is connected to an extrusion block (30), a spring (39) is connected between the extrusion block (30) and the slider (28), and the upper end of the extrusion block (30) abuts against the lower end of the cam (43).

7. The clean bench for vaccine production according to claim 1, characterized in that: A sleeve (20) is connected to one side of the back plate (6), a cylinder sleeve (21) is rotatably connected to the sleeve (20), the cylinder sleeve (21) is connected to the outside of a traction cylinder (22), a traction ring (27) is connected to the telescopic end of the traction cylinder (22), and the traction ring (27) is sleeved on a connecting rod (29).

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