Self-locking pneumatic cylinder on lifting device

Abstract

The utility model relates to the technical field of lifting devices, in particular to a self-locking pneumatic cylinder on a lifting device, which comprises a base, the top of the base is movably clamped with the bottom of a cylinder mechanism, the inner wall of the middle of the cylinder mechanism is slidably connected with the outer wall of a lifting mechanism, and the lifting mechanism comprises a lifting rod. The air pressure change of the air cylinder body drives the lifting connecting rod to move upwards, the lifting connecting rod moves upwards to drive the lifting rod to move upwards, the lifting rod moves upwards to drive the lifting top plate to move upwards, the lifting top plate can be lifted, and climbing operation is facilitated; the lifting connecting rod moves upwards to drive the locking rod to linearly move in the locking through hole through the inclined surface of the locking inclined block, and the locking rod linearly moves to drive the locking inclined block to be clamped into the locking groove through the locking spring, so that the lifting connecting rod can be locked; and the situation that a worker at the top of the lifting top plate cannot keep balance due to up-down shaking of the lifting connecting rod is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting devices, in particular to a self-locking pneumatic cylinder on a lifting device. Background Art

[0002] A lifting device is a mechanical device primarily used to achieve the lifting and lowering of objects or structures. Lifting devices are used in a variety of scenarios, including the relative lifting movement between the legs and the platform of a self-elevating platform, the guide rails and lifting devices on the exterior wall of high-rise building evacuation windows, and high-altitude work and maintenance. These different types of lifting devices play an important role in their respective application scenarios, ensuring the safe operation of equipment and the safety of personnel. Most lifting devices use pneumatic rods for lifting and lowering.

[0003] Currently, the pneumatic cylinders on most lifting devices on the market need to stay in operation for a long time after raising the lifting platform to the moving height. The long stay operation will cause the pneumatic cylinder to be subjected to strong air pressure, which is prone to shaking and causing the lifting platform to become unstable, thereby affecting the workers' inability to maintain balance and posing a risk of falling. Utility Model Content

[0004] The purpose of the present invention is to provide a self-locking pneumatic cylinder on a lifting device, so as to solve the problem proposed in the above background technology that long-term stop operation will cause the pneumatic cylinder to be subjected to strong air pressure, which is easy to shake and cause the lifting platform to be unstable, thereby affecting the workers' inability to maintain balance and posing a risk of falling. In order to achieve the above purpose, the present invention provides the following technical solutions: a self-locking pneumatic cylinder on a lifting device, comprising a base, the top of the base is movably engaged with the bottom of the cylinder mechanism, the inner wall of the middle part of the cylinder mechanism is slidably connected to the outer wall of the lifting mechanism, the lifting mechanism comprises a lifting rod, a lifting connecting rod and a lifting top plate, the inner wall of the lifting mechanism is slidably connected to the outer wall of the base, the outer side walls of the lifting mechanism are respectively movably abutted against the opposite sides of two locking mechanisms, the two locking mechanisms are composed of a locking bevel, a locking rod, a locking baffle, a locking spring and a locking limit plate, and the outer walls of the two locking mechanisms are respectively slidably connected to the inner walls on both sides of the cylinder mechanism;

[0005] The outer walls of the two locking mechanisms near the two ends are respectively movably connected to the inner walls on both sides of the moving mechanism. The moving mechanism includes two moving mounting rings, two moving connecting plates and a moving threaded rod. The outer wall in the middle of the moving mechanism is transmission-connected to the outer wall at the top of the transmission mechanism. The transmission mechanism consists of a transmission rod, a transmission gear shaft, a transmission gear plate, a transmission moving plate, a transmission mounting box and a transmission moving groove, and the bottom of the transmission mechanism is movably engaged with the top of the cylinder mechanism near the front.

[0006] Preferably, the base includes four movable wheels, a base, a connecting frame, a mounting plate and four limit rods, the tops of the four movable wheels are movably engaged with the bottom of the base, and the four movable wheels are distributed in a rectangular array about the center of the bottom of the base, the inner wall of the base is fixedly connected to the outer wall of the connecting frame, and the inner wall of the connecting frame is fixedly connected to the outer wall of the mounting plate, the top of the base is fixedly connected to the bottoms of the four limit rods, respectively, and the four limit rods are distributed in a rectangular array about the center of the top of the base.

[0007] Preferably, the cylinder mechanism consists of a cylinder body, a cylinder connecting box and a connecting mounting groove. The bottom of the cylinder body is movably connected to the top of the mounting plate, and the top of the cylinder body is movably connected to the bottom of the cylinder connecting box. The interior of the cylinder connecting box is provided with a connecting mounting groove, and the top of the cylinder connecting box is provided with a connecting through hole, and locking through holes are respectively provided on both sides of the cylinder connecting box.

[0008] Preferably, the bottom of the lifting rod is fixedly connected to the top of the lifting connecting rod, and the top of the lifting rod is movably engaged with the bottom of the middle part of the lifting top plate. The top of the lifting top plate is provided with four limiting through holes, and the inner walls of the four limiting through holes are movably sleeved with the outer walls of the four limiting rods respectively. The bottom of the lifting connecting rod is fixedly connected to the top of the cylinder body through a coupling, and the outer wall of the lifting connecting rod is provided with three locking grooves.

[0009] Preferably, the left sides of the two locking bevel blocks are movably abutted against the outer side wall of one of the locking grooves, and the right side of the locking bevel block is fixedly connected to one end of the locking rod, the outer wall of one end of the locking rod is movably engaged with the inner wall of the locking baffle, and the outer wall of the locking rod near one end is movably sleeved with the inner wall of the locking spring, the other end of the locking rod is fixedly connected to the left side of the locking limit plate, and the outer walls of the two locking rods near the other end are movably sleeved with the inner walls of the two locking through holes respectively.

[0010] Preferably, the inner walls of the two movable mounting rings are movably connected to the outer walls of the two locking rods near the other end, and the outer side walls of the two movable mounting rings are fixedly connected to the back sides of the two movable connecting plates, and the left sides of the front sides of the two movable connecting plates are respectively provided with connecting threaded holes, and the inner walls of the two connecting threaded holes are respectively threadedly connected to the outer walls of the two ends of the movable threaded rod, and the outer wall of the middle part of the movable threaded rod is provided with a bevel gear.

[0011] Preferably, the outer wall of the top of the transmission rod is provided with a bevel gear, and the outer wall of the top of the transmission rod is transmission-connected to the outer wall of the middle of the movable threaded rod through the bevel gear, the outer wall of the bottom of the transmission rod is movably engaged with the inner wall of the transmission gear shaft, and the outer wall of the transmission gear shaft is meshed with the back surface of the transmission gear plate, the top of the left side of the transmission gear plate is fixedly connected to the bottom of the transmission movable plate, and the transmission mounting box is provided with a transmission movable groove near the top of the front side, and the inner wall of the transmission movable groove is slidingly connected to the outer wall of the transmission movable plate, the bottom of the transmission mounting box is movably engaged with the top of the cylinder body near the front side, and transmission through holes are respectively provided on both sides of the transmission mounting box, and the inner walls of the two transmission through holes are respectively rotatably connected to the outer wall of the movable threaded rod near the middle.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The lifting rod is locked in the locking groove by the locking spring, so as to lock the lifting rod and prevent the lifting rod from shaking up and down, thereby preventing the staff on the top of the lifting plate from being unable to maintain balance.

[0014] The linear motion of the transmission gear plate drives the transmission gear shaft to rotate through the meshing action. The rotation of the transmission gear shaft drives the transmission rod to rotate. The rotating transmission rod drives the moving threaded rod to rotate through the bevel gear. The moving threaded rod rotates the through-hole thread to drive the moving connecting plate to move linearly. The linear motion of the moving connecting plate drives the moving mounting ring to move linearly. The linear motion of the moving mounting ring can drive the locking limit plate to move linearly. The linear motion of the locking limit plate can drive the locking bevel block to disengage from the locking groove and cancel the locking state, so that the lifting connecting rod can perform lifting operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the utility model;

[0016] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 3 This is an exploded view of the utility model;

[0018] Figure 4 This is an exploded view of the locking mechanism in the present utility model;

[0019] Figure 5 This is an exploded view of the mobile mechanism in the present utility model;

[0020] Figure 6 It is an exploded view of the transmission mechanism in the present utility model.

[0021] In the figure: 1. base; 101. moving wheel; 102. base; 103. connecting frame; 104. mounting plate; 105. limiting rod; 2. cylinder mechanism; 201. cylinder body; 202. cylinder connecting box; 203. connecting mounting groove; 3. lifting mechanism; 301. lifting rod; 302. lifting connecting rod; 303. lifting top plate; 4. locking mechanism; 401. locking bevel block; 402. locking rod; 403. locking baffle; 404. locking spring; 405. locking limiting plate; 5. moving mechanism; 501. moving mounting ring; 502. moving connecting plate; 503. moving threaded rod; 6. transmission mechanism; 601. transmission rod; 602. transmission gear shaft; 603. transmission gear plate; 604. transmission moving plate; 605. transmission mounting box; 606. transmission moving groove. DETAILED DESCRIPTION

[0022] 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 embodiments described 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 technical personnel in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] See also Figures 1 to 6 The utility model provides a technical solution: a self-locking pneumatic cylinder on a lifting device, comprising a base 1, the top of the base 1 is movably connected to the bottom of the cylinder mechanism 2, the inner wall of the middle part of the cylinder mechanism 2 is slidably connected to the outer wall of the lifting mechanism 3, the lifting mechanism 3 comprises a lifting rod 301, a lifting connecting rod 302 and a lifting top plate 303, the inner wall of the lifting mechanism 3 is slidably connected to the outer wall of the base 1, and the outer side walls of the lifting mechanism 3 are movably abutted against the opposite sides of two locking mechanisms 4, and the two locking mechanisms 4 are composed of a locking bevel 401, a locking rod 402, a locking baffle 403, a locking spring 404 and a locking limit plate 405, and the outer walls of the two locking mechanisms 4 are respectively slidably connected to the inner walls on both sides of the cylinder mechanism 2;

[0024] The outer walls of the two locking mechanisms 4 near the two ends are movably connected to the inner walls on both sides of the moving mechanism 5 respectively. The moving mechanism 5 includes two moving mounting rings 501, two moving connecting plates 502 and a moving threaded rod 503. The outer wall in the middle of the moving mechanism 5 is transmission-connected to the outer wall at the top of the transmission mechanism 6. The transmission mechanism 6 is composed of a transmission rod 601, a transmission gear shaft 602, a transmission gear plate 603, a transmission moving plate 604, a transmission mounting box 605 and a transmission moving groove 606, and the bottom of the transmission mechanism 6 is movably engaged with the top of the cylinder mechanism 2 near the front.

[0025] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the base 1 includes four moving wheels 101, a base 102, a connecting frame 103, a mounting plate 104 and four limiting rods 105. The tops of the four moving wheels 101 are movably engaged with the bottom of the base 102, and the four moving wheels 101 are distributed in a rectangular array about the center of the bottom of the base 102. The inner wall of the base 102 is fixedly connected to the outer wall of the connecting frame 103, and the inner wall of the connecting frame 103 is fixedly connected to the outer wall of the mounting plate 104. The top of the base 102 is fixedly connected to the bottoms of the four limiting rods 105, respectively, and the four limiting rods 105 are distributed in a rectangular array about the center of the top of the base 102.

[0026] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the cylinder mechanism 2 consists of a cylinder body 201, a cylinder connecting box 202 and a connecting mounting groove 203. The bottom of the cylinder body 201 is movably connected to the top of the mounting plate 104, and the top of the cylinder body 201 is movably connected to the bottom of the cylinder connecting box 202. The interior of the cylinder connecting box 202 is provided with a connecting mounting groove 203, and the top of the cylinder connecting box 202 is provided with a connecting through hole, and locking through holes are respectively provided on both sides of the cylinder connecting box 202.

[0027] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, the bottom of the lifting rod 301 is fixedly connected to the top of the lifting connecting rod 302, and the top of the lifting rod 301 is movably engaged with the bottom of the middle part of the lifting top plate 303. The top of the lifting top plate 303 is provided with four limiting through holes, and the inner walls of the four limiting through holes are movably sleeved with the outer walls of the four limiting rods 105 respectively. The bottom of the lifting connecting rod 302 is fixedly connected to the top of the cylinder body 201 through a coupling, and the outer wall of the lifting connecting rod 302 is provided with three locking grooves. Start the cylinder body 201, and the lifting connecting rod 302 is driven to move upward by the change of air pressure in the cylinder body 201. The upward movement of the lifting connecting rod 302 drives the lifting rod 301 to move upward. The upward movement of the lifting connecting rod 301 drives the lifting top plate 303 to move upward, which can raise the lifting top plate 303 and facilitate climbing operations.

[0028] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the left sides of the two locking bevels 401 are movably abutted against the outer side wall of one of the locking grooves, and the right side of the locking bevel 401 is fixedly connected to one end of the locking rod 402, the outer wall of one end of the locking rod 402 is movably engaged with the inner wall of the locking baffle 403, and the outer wall of the locking rod 402 near one end is movably sleeved with the inner wall of the locking spring 404, and the other end of the locking rod 402 is fixedly connected to the left side of the locking limit plate 405, and the two locking rods 402 near the other end are fixedly connected to the left side of the locking limit plate 405. The outer walls are movably connected to the inner walls of the two locking through holes respectively. The upward movement of the lifting connecting rod 302 can drive the locking rod 402 to move linearly inside the locking through hole through the inclined surface of the locking bevel 401. The linear movement of the locking rod 402 can drive the locking bevel 401 to be stuck into the locking groove through the locking spring 404, which can lock the lifting connecting rod 302 to prevent the lifting connecting rod 302 from shaking up and down, causing the staff on the top of the lifting top plate 303 to be unable to maintain balance.

[0029] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, the inner walls of the two movable mounting rings 501 are movably connected to the outer walls of the two locking rods 402 near the other end, and the outer side walls of the two movable mounting rings 501 are fixedly connected to the back sides of the two movable connecting plates 502. The left sides of the front faces of the two movable connecting plates 502 are respectively provided with connecting threaded holes, and the inner walls of the two connecting threaded holes are respectively threadedly connected to the outer walls of the two ends of the movable threaded rod 503. The outer wall of the middle part of the movable threaded rod 503 is provided with a bevel gear. The movable threaded rod 503 rotates the through-hole thread to drive the movable connecting plate 502 to move linearly. The linear movement of the movable connecting plate 502 drives the movable mounting ring 501 to move linearly. The linear movement of the movable mounting ring 501 can drive the locking limit plate 405 to move linearly. The linear movement of the locking limit plate 405 can drive the locking bevel block 401 to disengage from the locking groove and cancel the locked state, so that the lifting connecting rod 302 can perform lifting operations.

[0030] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the outer wall of the top of the transmission rod 601 is provided with a bevel gear, and the outer wall of the top of the transmission rod 601 is transmission-connected to the outer wall of the middle part of the movable threaded rod 503 through the bevel gear, the outer wall of the bottom of the transmission rod 601 is movably engaged with the inner wall of the transmission gear shaft 602, and the outer side wall of the transmission gear shaft 602 is meshed with the back side of the transmission gear plate 603, the top of the left side of the transmission gear plate 603 is fixedly connected to the bottom of the transmission movable plate 604, and the top of the transmission mounting box 605 near the front is provided with a transmission movable groove 606, and the inner wall of the transmission movable groove 606 is slidingly connected to the outer wall of the transmission movable plate 604, and the transmission mounting box 605 is provided with a transmission movable groove 606. The bottom of 05 is movably connected with the top of the cylinder body 201 near the front, and transmission through holes are respectively provided on both sides of the transmission mounting box 605. The inner walls of the two transmission through holes are respectively rotatably connected with the outer wall of the movable threaded rod 503 near the middle, pushing the transmission movable plate 604. The transmission movable plate 604 moves linearly in the transmission movable groove 606, driving the transmission tooth plate 603 to move linearly. The transmission tooth plate 603 moves linearly and drives the transmission gear shaft 602 to rotate through the meshing action. The rotation of the transmission gear shaft 602 drives the transmission rod 601 to rotate. The rotating transmission rod 601 drives the movable threaded rod 503 to rotate through the bevel gear.

[0031] The use method and advantages of this utility model: When the self-locking pneumatic cylinder on this lifting device is working, the working process is as follows:

[0032] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, by pushing the transmission movable plate 604, the transmission movable plate 604 moves linearly in the transmission movable groove 606, driving the transmission tooth plate 603 to move linearly, and the transmission tooth plate 603 moves linearly through the meshing action to drive the transmission gear shaft 602 to rotate, and the rotation of the transmission gear shaft 602 drives the transmission rod 601 to rotate, and the rotating transmission rod 601 drives the moving threaded rod 503 to rotate through the bevel gear, and the moving threaded rod 503 rotates through the through-hole thread to drive the moving connecting plate 502 to move linearly, and the moving connecting plate 502 moves linearly to drive the moving mounting ring 501 to move linearly, and the moving mounting ring 501 moves linearly to drive the locking limit plate 405 to move linearly, and the locking limit plate 405 moves linearly to drive the locking bevel block 401 to disengage from the locking groove to cancel the locking state, thereby making the lifting connection The rod 302 can perform lifting operations, and the cylinder body 201 is started. The air pressure change of the cylinder body 201 drives the lifting connecting rod 302 to move upward. The upward movement of the lifting connecting rod 302 drives the lifting rod 301 to move upward. The upward movement of the lifting rod 301 drives the lifting top plate 303 to move upward, which can raise the lifting top plate 303 and facilitate climbing operations. The upward movement of the lifting connecting rod 302 can drive the locking rod 402 to move linearly inside the locking through hole through the inclined surface of the locking bevel 401. The linear movement of the locking rod 402 can drive the locking bevel 401 to be stuck in the locking groove through the locking spring 404, which can lock the lifting connecting rod 302 to prevent the lifting connecting rod 302 from shaking up and down, which may cause the staff on the top of the lifting top plate 303 to lose their balance.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Persons skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-locking pneumatic cylinder on a lifting device, comprising a base (1), characterized in that: The top of the base (1) is movably connected to the bottom of the cylinder mechanism (2), the inner wall of the middle part of the cylinder mechanism (2) is slidably connected to the outer wall of the lifting mechanism (3), the lifting mechanism (3) includes a lifting rod (301), a lifting connecting rod (302) and a lifting top plate (303), the inner wall of the lifting mechanism (3) is slidably connected to the outer wall of the base (1), the outer side walls of the lifting mechanism (3) are movably abutted against the opposite sides of the two locking mechanisms (4), the two locking mechanisms (4) are composed of a locking bevel (401), a locking rod (402), a locking baffle (403), a locking spring (404) and a locking limit plate (405), and the outer walls of the two locking mechanisms (4) are slidably connected to the inner walls on both sides of the cylinder mechanism (2); The outer walls of the two locking mechanisms (4) near both ends are respectively movably connected to the inner walls on both sides of the moving mechanism (5); the moving mechanism (5) comprises two moving mounting rings (501), two moving connecting plates (502) and a moving threaded rod (503); the outer wall of the middle portion of the moving mechanism (5) is transmission-connected to the outer wall of the top of the transmission mechanism (6); the transmission mechanism (6) comprises a transmission rod (601), a transmission gear shaft (602), a transmission gear plate (603), a transmission moving plate (604), a transmission mounting box (605) and a transmission moving groove (606); and the bottom of the transmission mechanism (6) is movably connected to the top of the cylinder mechanism (2) near the front.

2. The self-locking pneumatic cylinder on a lifting device according to claim 1, characterized in that: The base (1) comprises four moving wheels (101), a base (102), a connecting frame (103), a mounting plate (104) and four limiting rods (105); the tops of the four moving wheels (101) are movably connected to the bottom of the base (102), and the four moving wheels (101) are distributed in a rectangular array about the center of the bottom of the base (102); the inner wall of the base (102) is fixedly connected to the outer wall of the connecting frame (103), and the inner wall of the connecting frame (103) is fixedly connected to the outer wall of the mounting plate (104); the top of the base (102) is fixedly connected to the bottoms of the four limiting rods (105), and the four limiting rods (105) are distributed in a rectangular array about the center of the top of the base (102).

3. The self-locking pneumatic cylinder on a lifting device according to claim 2, characterized in that: The cylinder mechanism (2) is composed of a cylinder body (201), a cylinder connection box (202) and a connection installation groove (203); the bottom of the cylinder body (201) is movably connected to the top of the installation plate (104), and the top of the cylinder body (201) is movably connected to the bottom of the cylinder connection box (202); the connection installation groove (203) is provided inside the cylinder connection box (202), and the top of the cylinder connection box (202) is provided with a connection through hole, and locking through holes are respectively provided on both sides of the cylinder connection box (202).

4. The self-locking pneumatic cylinder on a lifting device according to claim 3, characterized in that: The bottom of the lifting rod (301) is fixedly connected to the top of the lifting connecting rod (302), and the top of the lifting rod (301) is movably engaged with the bottom of the middle part of the lifting top plate (303). The top of the lifting top plate (303) is provided with four limiting through holes, and the inner walls of the four limiting through holes are movably sleeved with the outer walls of the four limiting rods (105) respectively. The bottom of the lifting connecting rod (302) is fixedly connected to the top of the cylinder body (201) through a coupling, and the outer wall of the lifting connecting rod (302) is provided with three locking grooves.

5. The self-locking pneumatic cylinder on a lifting device according to claim 4, characterized in that: The left sides of the two locking bevel blocks (401) are movably abutted against the outer side wall of one of the locking grooves, and the right side of the locking bevel block (401) is fixedly connected to one end of the locking rod (402), the outer wall of one end of the locking rod (402) is movably engaged with the inner wall of the locking baffle (403), and the outer wall of the locking rod (402) close to one end is movably sleeved with the inner wall of the locking spring (404), the other end of the locking rod (402) is fixedly connected to the left side of the locking limit plate (405), and the outer walls of the two locking rods (402) close to the other end are movably sleeved with the inner walls of the two locking through holes respectively.

6. The self-locking pneumatic cylinder on a lifting device according to claim 5, characterized in that: The inner walls of the two movable mounting rings (501) are movably connected to the outer walls of the two locking rods (402) near the other end, and the outer side walls of the two movable mounting rings (501) are fixedly connected to the back sides of the two movable connecting plates (502). The left sides of the front faces of the two movable connecting plates (502) are respectively provided with connecting threaded holes, and the inner walls of the two connecting threaded holes are respectively threadedly connected to the outer walls of the two ends of the movable threaded rod (503), and the outer wall of the middle part of the movable threaded rod (503) is provided with a bevel gear.

7. The self-locking pneumatic cylinder on a lifting device according to claim 6, characterized in that: The outer wall of the top of the transmission rod (601) is provided with a bevel gear, and the outer wall of the top of the transmission rod (601) is transmission-connected to the outer wall of the middle part of the movable threaded rod (503) through the bevel gear. The outer wall of the bottom of the transmission rod (601) is movably engaged with the inner wall of the transmission gear shaft (602), and the outer side wall of the transmission gear shaft (602) is meshedly connected with the back side of the transmission gear plate (603). The top of the left side of the transmission gear plate (603) is fixedly connected to the bottom of the transmission movable plate (604). A transmission moving groove (606) is provided on the top of the transmission installation box (605) near the front, and the inner wall of the transmission moving groove (606) is slidably connected to the outer wall of the transmission moving plate (604). The bottom of the transmission installation box (605) is movably engaged with the top of the cylinder body (201) near the front, and transmission through holes are respectively provided on both sides of the transmission installation box (605). The inner walls of the two transmission through holes are respectively rotatably connected to the outer wall of the movable threaded rod (503) near the middle.

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