Leather processing cutting machine for automobile interior armrest

Abstract

The utility model discloses a leather processing cutting machine for an automobile interior armrest. The leather processing cutting machine comprises a box body, a force-driven transmission mechanism, a cutting mechanism, a drawing mechanism and a pressing mechanism, an avoiding opening is formed in the left side face of the box body, and supporting legs are arranged at the four corners of the bottom face of the box body correspondingly; the cutting mechanism comprises limiting rods, upper side limiting seats and lower side limiting seats, the limiting rods are fixedly connected between the upper side inner wall and the lower side inner wall of the box body in a front-back symmetry mode, the upper side limiting seats are slidably connected to the upper sides of the outer arc surfaces of the two limiting rods, and the lower side limiting seats are slidably connected to the lower sides of the outer arc surfaces of the two limiting rods; the force-driven transmission mechanism is arranged in the box body, and the force-driven transmission mechanism is rotationally connected with the cutting mechanism; the drawing mechanism is arranged in the box body, and the drawing mechanism is fixedly connected with the cutting mechanism; and the pressing mechanism is arranged in the drawing mechanism, and the leather processing cutting machine for the automobile interior armrest is high in structural coherence and easy and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a leather processing and cutting machine for automobile interior armrests. Background Art

[0002] The car center armrest is also called the car armrest, which is located between the two seats and provides elbow support for the driver and passengers. The car center armrest is also called the car armrest. It was originally designed to provide elbow support for passengers, and later developed into a storage box in the car, including an armrest panel, which is convenient for conversation, office work, reading documents, etc. The surface of the armrest is often wrapped with a layer of leather, which needs to be cut before use.

[0003] Existing cutting machines often use large-scale cutting machines, which often require precise CNC machine tools, transmission machines, and sequentially driven cutters and fixtures to cut the leather.

[0004] There are some problems. This kind of cutting machine often needs to use many driving machines to drive various mechanisms in sequence, which has poor continuity and cumbersome operation. For this reason, we propose a leather processing and cutting machine for automobile interior armrests. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide a leather processing and cutting machine for automobile interior armrests, which is simple to operate and has strong consistency, and can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: A leather processing and cutting machine for automobile interior armrests, comprising a box body, a force-driven transmission mechanism, a cutting mechanism, a pulling mechanism and a pressing mechanism;

[0007] Box body: There is an escape opening on the left side, and legs are provided at the four corners of the bottom of the box body;

[0008] Cutting mechanism: It includes a limit rod, an upper limit seat and a lower limit seat. The limit rods are symmetrically fixedly connected between the upper inner wall and the lower inner wall of the box body. The upper sides of the outer arc surfaces of the two limit rods are slidably connected to the upper limit seat, and the lower sides of the outer arc surfaces of the two limit rods are slidably connected to the lower limit seat;

[0009] Force-driven transmission mechanism: it is arranged inside the box body, and the force-driven transmission mechanism is rotationally connected with the cutting mechanism;

[0010] Pull-out mechanism: it is arranged inside the box body, and the pull-out mechanism is fixedly connected with the cutting mechanism;

[0011] Pressing mechanism: It is arranged inside the pulling mechanism, with strong structural consistency and easy operation.

[0012] Furthermore, the force-driven transmission mechanism includes a middle rotating shaft, a middle connecting rod, an upper connecting rod and a lower connecting rod, the middle rotating shaft is respectively fixedly connected to the middle part of the front side surface and the middle part of the rear side surface of the box body, the outer arc surfaces of the two middle rotating shafts are respectively rotatably connected to the middle connecting rods, the upper sides of the relative inner sides of the two middle connecting rods are rotatably connected to the upper connecting rods through rotating shafts, the lower sides of the relative inner sides of the two middle connecting rods are rotatably connected to the lower connecting rods through rotating shafts, the upper ends of the two upper connecting rods are rotatably connected to the outer surface of the upper limit seat at the corresponding position through the rotating shaft, and the lower ends of the two lower connecting rods are rotatably connected to the outer surface of the lower limit seat at the corresponding position through the rotating shaft.

[0013] Furthermore, the cutting mechanism includes an upper shift plate, a vertical connecting rod, a cutting mounting plate, a spring, an avoidance groove and a lower displacement plate, the upper shift plate is fixedly connected between the two upper limit seats, the lower displacement plate is fixedly connected between the two lower limit seats, the lower side surface of the upper shift plate is fixedly connected with a front-and-rear symmetrical vertical connecting rod, the middle parts of the outer arc surfaces of the two limit rods are slidably connected to a cutting mounting plate, the upper side surface of the cutting mounting plate is provided with front-and-rear symmetrical avoidance grooves, the lower ends of the two vertical connecting rods extend from the avoidance grooves corresponding in position to the lower side of the cutting mounting plate, front-and-rear symmetrical springs are fixedly connected between the upper shift plate and the cutting mounting plate, the two springs are respectively movably mounted on the outer arc surfaces of the limit rods corresponding in position, and the lower surface of the cutting mounting plate is fixedly connected with a pressing frame to realize the transmission function.

[0014] Furthermore, it also includes a cutting mold, the upper surface of which is fixedly connected to the lower ends of two vertical connecting rods, the lower surface of which is fixedly connected to a cutting knife, and the upper surface of the cutting mold is provided with a pressure relief port to achieve the cutting function.

[0015] Furthermore, the pulling and pulling mechanism includes a fixed plate, a longitudinal telescopic rod and a slide groove. The fixed plate is symmetrically fixedly connected between the left and right inner walls of the box body front and back. The interiors of the two fixed plates are fixedly connected to the outer arc surface of the limit rod at the corresponding position. The relative inner sides of the two fixed plates are provided with slide grooves. The left inner wall of the box body is symmetrically fixedly connected with the longitudinal telescopic rod front and back. The two longitudinal telescopic rods are respectively located inside the corresponding slide grooves to realize the function of pulling and placing.

[0016] Furthermore, the pressing mechanism includes a placement plate, an upper snap-fit ​​frame, a front counterweight frame, a handle and a stamping die groove. The left side of the placement plate is fixedly connected to the telescopic ends of the two longitudinal telescopic rods. The interiors of the two slide grooves are slidably connected to the front and rear sides of a placement plate. The left side of the upper surface of the placement plate is rotatably connected to the upper snap-fit ​​frame through a pin shaft, the right side of the upper snap-fit ​​frame is fixedly connected to the front counterweight frame, the middle part of the right side of the front counterweight frame is fixedly connected to a handle, and a stamping die groove is provided on the upper surface of the placement plate to realize the function of initial positioning of the leather.

[0017] Furthermore, it also includes a telescopic cylinder, which is fixedly connected to the lower inner wall of the box body, the telescopic end of the telescopic cylinder is fixedly connected to the lower surface of the lower displacement plate, and the air inlet of the telescopic cylinder is connected to an external air pump to provide driving force for the entire cutting.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the leather processing and cutting machine for automobile interior armrests has the following advantages:

[0019] 1. When the leather for the interior armrest of the car needs to be cut, the leather for the interior armrest of the car needs to be positioned. At this time, the upper buckle frame is opened by the handle, and the leather raw material is placed on the placement plate. At this time, the upper buckle frame is closed, and the leather raw material is pressed by the pressure of the front counterweight frame. The upper buckle frame and the upper buckle frame cooperate to press the leather raw material, and then the placement plate is manually pushed into the inside of the slide groove. During this process, the slide groove cooperates with the longitudinal telescopic rod to achieve stable movement of the placement plate, which can quickly complete the compression and positioning of the leather for the interior armrest of the car.

[0020] 2. Regulate the external air pump, the telescopic cylinder operates, the telescopic end of the telescopic cylinder extends to the specified position, thereby driving the lower displacement plate to move upward, and at the same time, the lower connecting rod takes its lower end as a circle, thereby driving the upper end of the lower connecting rod to adjust the angle, and then the middle connecting rod takes itself as the center of the circle for angle adjustment, and then drives the upper displacement plate downward through the upper connecting rod. After moving downward to the specified position, it is affected by the spring tension, and the pressing frame of the cutting mounting plate presses the leather. Then, the upper displacement plate continues to move downward, and continues to drive the cutting die to move downward through the vertical connecting rod, driving the cutting knife to extend into the stamping die groove to complete the cutting of the leather for the internal armrest of the automobile. At this time, regulate the external air pump, the telescopic end of the telescopic cylinder is reset, thereby driving each part to reset. At this time, pull out the placement plate, open the upper buckle frame, and take away the leather for the internal armrest of the automobile. A single cylinder can complete the cutting of the leather for the internal armrest of the automobile, with strong structural consistency and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic cross-sectional view of the cutting mechanism of the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of the pressing mechanism of the utility model.

[0024] In the figure: 1 box body, 2 force drive transmission mechanism, 21 middle rotating shaft, 22 middle connecting rod, 23 upper connecting rod, 24 lower connecting rod, 3 cutting mechanism, 31 limit rod, 32 upper limit seat, 33 upper displacement plate, 34 vertical connecting rod, 35 cutting installation plate, 36 spring, 37 avoidance groove, 38 lower limit seat, 39 lower displacement plate, 4 cutting mold, 5 pulling mechanism, 51 fixed plate, 52 longitudinal telescopic rod, 53 slide groove, 6 pressing mechanism, 61 placement plate, 62 upper buckle frame, 63 front counterweight frame, 64 handle, 65 stamping mold groove, 7 legs, 8 avoidance. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-3 , this embodiment provides a technical solution: a leather processing and cutting machine for automobile interior armrests, comprising a box body 1, a force-driven transmission mechanism 2, a cutting mechanism 3, a pulling mechanism 5 and a pressing mechanism 6;

[0027] Box 1: A clearance opening 8 is provided on the left side thereof, and legs 7 are provided at the four corners of the bottom of the box 1, and the cutting machine is placed on the designated workstation through the legs 7;

[0028] The cutting mechanism 3 includes a limit rod 31, an upper limit seat 32 and a lower limit seat 38. The limit rod 31 is symmetrically fixedly connected between the upper inner wall and the lower inner wall of the box body 1. The upper sides of the outer arc surfaces of the two limit rods 31 are slidably connected with the upper limit seats 32, and the lower sides of the outer arc surfaces of the two limit rods 31 are slidably connected with the lower limit seats 38. The cutting mechanism 3 includes an upper displacement plate 33, a vertical connecting rod 34, a cutting mounting plate 35, a spring 36, an avoidance groove 37 and a lower displacement plate 39. The upper displacement plate 33 is fixedly connected between the two upper limit seats 32, and the lower displacement plate 39 is fixedly connected between the two lower limit seats 38. The lower side of the upper displacement plate 33 is fixedly connected with a front-to-back symmetrical vertical connecting rod 34. The middle parts of the outer arc surfaces of the two limit rods 31 are slidably connected with a cutting mounting plate 35. The upper side surface of the mounting plate 35 is provided with a front-to-back symmetrical avoidance groove 37, and the lower ends of the two vertical connecting rods 34 extend from the corresponding avoidance groove 37 to the lower side of the cutting mounting plate 35. A front-to-back symmetrical spring 36 is fixedly connected between the upper displacement plate 33 and the cutting mounting plate 35. The two springs 36 are respectively movably sleeved on the outer arc surface of the corresponding limit rod 31. The lower surface of the cutting mounting plate 35 is fixedly connected with a pressing frame, and also includes a cutting mold 4. The upper surface of the cutting mold 4 is fixedly connected to the lower ends of the two vertical connecting rods 34. The lower surface of the cutting mold 4 is fixedly connected with a cutting knife. The upper surface of the cutting mold 4 is provided with a pressure relief port, and also includes a telescopic cylinder, which is fixedly connected to the lower inner wall of the box body 1. The telescopic end of the telescopic cylinder is fixedly connected to the lower surface of the lower displacement plate 39, and the air inlet of the telescopic cylinder is connected to an external air pump.

[0029] The force-driven transmission mechanism 2 is arranged inside the box body 1, and the force-driven transmission mechanism 2 is rotatably connected to the cutting mechanism 3. The force-driven transmission mechanism 2 includes a middle rotating shaft 21, a middle connecting rod 22, an upper connecting rod 23 and a lower connecting rod 24. The middle rotating shaft 21 is respectively fixedly connected to the middle of the front side surface and the middle of the rear side surface of the box body 1. The outer arc surfaces of the two middle rotating shafts 21 are respectively rotatably connected to the middle connecting rods 22. The upper sides of the relative inner sides of the two middle connecting rods 22 are rotatably connected to the upper connecting rods 23 through the rotating shafts. The lower sides of the relative inner sides of the two middle connecting rods 22 are rotatably connected to the lower connecting rods 24 through the rotating shafts. The upper ends of the two upper connecting rods 23 are rotatably connected to the outer surface of the upper limiting seat 32 corresponding to the position through the rotating shafts. The lower ends of the two lower connecting rods 24 are respectively rotatably connected to the upper limiting seat 32 corresponding to the position through the rotating shafts. The rotating shaft is rotatably connected with the outer surface of the lower limit seat 38 corresponding to the position. At this time, the external air pump is regulated to operate the telescopic cylinder, and the telescopic end of the telescopic cylinder is extended to the specified position, thereby driving the lower displacement plate 39 to move upward. At the same time, the lower connecting rod 24 is used to make its lower end circular, thereby driving the upper end of the lower connecting rod 24 to adjust the angle, and then the middle connecting rod 22 is used to adjust the angle with itself as the center of the circle, and then the upper displacement plate 33 is driven downward by the upper connecting rod 23. After moving downward to the specified position, it is affected by the tension of the spring 36, and the pressing frame of the cutting installation plate 35 presses the leather for the interior armrest of the automobile. Then, the upper displacement plate 33 continues to move downward, and continues to drive the cutting mold 4 to move downward through the vertical connecting rod 34;

[0030] Pull-out mechanism 5: It is arranged inside the box body 1, and the pull-out mechanism 5 is fixedly connected to the cutting mechanism 3. The pull-out mechanism 5 includes a fixed plate 51, a longitudinal telescopic rod 52 and a slide groove 53. The fixed plate 51 is fixedly connected between the left and right inner walls of the box body 1 symmetrically in the front and back. The insides of the two fixed plates 51 are fixedly connected to the outer arc surface of the position-limiting rod 31 at the corresponding position. The opposite inner sides of the two fixed plates 51 are provided with a slide groove 53. The left inner wall of the box body 1 is fixedly connected with the longitudinal telescopic rod 52 symmetrically in the front and back. The two longitudinal telescopic rods 52 are respectively located in the corresponding slide grooves 53;

[0031] Pressing mechanism 6: It is arranged inside the pulling mechanism 5, and the pressing mechanism 6 includes a placing plate 61, an upper buckling frame 62, a front counterweight frame 63, a handle 64 and a stamping die groove 65. The left side of the placing plate 61 is fixedly connected to the telescopic ends of the two longitudinal telescopic rods 52, and the interiors of the two slide grooves 53 are slidably connected to the front and rear sides of a placing plate 61. The left side of the upper surface of the placing plate 61 is rotatably connected with the upper buckling frame 62 through a pin shaft, and the right side of the upper buckling frame 62 is fixedly connected with the front counterweight frame 63, and the middle part of the right side of the front counterweight frame 63 is fixedly connected with a handle 64. The upper surface of the placing plate 61 is provided with a stamping die groove 65, and the upper buckling frame 62 is opened by the handle 64. The leather raw material for the interior armrest of the automobile is placed on the placement plate 61. At this time, the upper buckle frame 62 is closed, and the leather raw material is pressed by the pressure of the front counterweight frame 63. The cooperation between the upper buckle frame 62 and the upper buckle frame 62 presses the leather raw material, and then the placement plate 61 is manually pushed into the interior of the slide groove 53. During this process, the slide groove 53 cooperates with the longitudinal telescopic rod 52 to achieve stable movement of the placement plate 61, driving the cutting knife to extend into the stamping die groove 65 to complete the cutting of the leather for the interior armrest of the automobile. At this time, the external air pump is regulated, and the telescopic end of the telescopic cylinder is reset, thereby driving each part to reset. At this time, the placement plate 61 is pulled out, the upper buckle frame 62 is opened, and the leather for the interior armrest of the automobile is taken away.

[0032] The working principle of a leather processing and cutting machine for automobile interior armrests provided by the utility model is as follows: the cutting machine is placed on a designated workstation through the legs 7, and the upper buckle frame 62 is opened by the handle 64 at this time, and the leather raw material for the automobile interior armrest is placed on the placement plate 61. At this time, the upper buckle frame 62 is closed, and the leather raw material for the automobile interior armrest is pressed by the pressure of the front counterweight frame 63. The cooperation of the upper buckle frame 62 and the upper buckle frame 62 presses the leather raw material for the automobile interior armrest, and then the placement plate 61 is manually pushed into the interior of the slide groove 53. During this process, the slide groove 53 cooperates with the longitudinal telescopic rod 52 to achieve stable movement of the placement plate 61. At this time, the external air pump is regulated, the telescopic cylinder is operated, and the telescopic end of the telescopic cylinder is extended to the designated position, thereby driving the lower displacement plate 39 to move upward, and at the same time, through the lower connecting rod 2 4 takes its lower end as a circle, thereby driving the upper end of the lower connecting rod 24 to adjust the angle, and then adjusts the angle through the middle connecting rod 22 with itself as the center of the circle, and then drives the upper shift plate 33 to move downward through the upper connecting rod 23. After moving downward to the specified position, it is affected by the tension of the spring 36, and the pressing frame of the cutting installation plate 35 presses the leather for the interior armrest of the automobile. Then, the upper shift plate 33 continues to move downward, and continues to drive the cutting die 4 to move downward through the vertical connecting rod 34, driving the cutting knife to extend into the stamping die groove 65, and completing the cutting of the leather for the interior armrest of the automobile. At this time, the external air pump is regulated, and the telescopic end of the telescopic cylinder is reset, thereby driving each part to reset. At this time, the placement plate 61 is pulled out, the upper buckle frame 62 is opened, and the leather for the interior armrest of the automobile can be taken away.

[0033] It is worth noting that the telescopic cylinder disclosed in the above embodiments can be freely configured according to the actual application scenario, and it is recommended to use ACQ80-10-S model cylinder as the telescopic cylinder.

[0034] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A leather processing and cutting machine for automobile interior armrests, characterized in that: It comprises a box body (1), a force-driven transmission mechanism (2), a cutting mechanism (3), a pulling mechanism (5) and a pressing mechanism (6); Box body (1): a clearance opening (8) is provided on the left side thereof, and supporting legs (7) are provided at the four corners of the bottom surface of the box body (1); The cutting mechanism (3) comprises a limiting rod (31), an upper limiting seat (32) and a lower limiting seat (38), wherein the limiting rod (31) is symmetrically fixedly connected between the upper inner wall and the lower inner wall of the box body (1) in a front-to-back manner, the upper sides of the outer arc surfaces of the two limiting rods (31) are slidably connected to the upper limiting seat (32), and the lower sides of the outer arc surfaces of the two limiting rods (31) are slidably connected to the lower limiting seat (38); A force-driven transmission mechanism (2): the force-driven transmission mechanism (2) is arranged inside the box body (1), and the force-driven transmission mechanism (2) is rotationally connected to the cutting mechanism (3); A drawer mechanism (5): the drawer mechanism (5) is arranged inside the box body (1), and the drawer mechanism (5) is fixedly connected to the cutting mechanism (3); Pressing mechanism (6): it is arranged inside the pulling mechanism (5).

2. The leather processing and cutting machine for automobile interior armrest according to claim 1, characterized in that: The force-driven transmission mechanism (2) comprises a middle rotating shaft (21), a middle connecting rod (22), an upper connecting rod (23) and a lower connecting rod (24); the middle rotating shaft (21) is respectively fixedly connected to the middle of the front side surface and the middle of the rear side surface of the box body (1); the outer arc surfaces of the two middle rotating shafts (21) are respectively rotatably connected to the middle connecting rods (22); the upper sides of the relatively inner side surfaces of the two middle connecting rods (22) are rotatably connected to the upper connecting rods (23) via rotating shafts; the lower sides of the relatively inner side surfaces of the two middle connecting rods (22) are rotatably connected to the lower connecting rods (24) via rotating shafts; the upper ends of the two upper connecting rods (23) are rotatably connected to the outer surface of the corresponding upper limiting seat (32) via rotating shafts; and the lower ends of the two lower connecting rods (24) are rotatably connected to the outer surface of the corresponding lower limiting seat (38) via rotating shafts.

3. The leather processing and cutting machine for automobile interior armrest according to claim 2, characterized in that: The cutting mechanism (3) comprises an upper displacement plate (33), a vertical connecting rod (34), a cutting installation plate (35), a spring (36), an avoidance groove (37) and a lower displacement plate (39); the upper displacement plate (33) is fixedly connected between two upper limit seats (32); the lower displacement plate (39) is fixedly connected between two lower limit seats (38); the lower side surface of the upper displacement plate (33) is fixedly connected to a front-to-back symmetrical vertical connecting rod (34); the middle parts of the outer arc surfaces of the two limit rods (31) are connected to a cutting The cutting installation plate (35) is slidably connected, and a front-to-back symmetrical avoidance groove (37) is opened on the upper side of the cutting installation plate (35). The lower ends of the two vertical connecting rods (34) extend from the avoidance groove (37) at the corresponding position to the lower side of the cutting installation plate (35). A front-to-back symmetrical spring (36) is fixedly connected between the upper displacement plate (33) and the cutting installation plate (35). The two springs (36) are respectively movably sleeved on the outer arc surface of the limit rod (31) at the corresponding position. A pressing frame is fixedly connected to the lower surface of the cutting installation plate (35).

4. The leather processing and cutting machine for automobile interior armrest according to claim 3, characterized in that: It also comprises a cutting mould (4), the upper surface of which is fixedly connected to the lower ends of the two vertical connecting rods (34), the lower surface of which is fixedly connected to a cutting knife, and the upper surface of which is provided with a pressure relief port.

5. The leather processing and cutting machine for automobile interior armrest according to claim 1, characterized in that: The pulling mechanism (5) comprises a fixed plate (51), a longitudinal telescopic rod (52) and a slide groove (53); the fixed plate (51) is symmetrically fixedly connected between the left and right inner walls of the box body (1) in a front-to-back manner; the interiors of the two fixed plates (51) are fixedly connected to the outer arc surface of the corresponding position limit rod (31); the slide grooves (53) are provided on the opposite inner side surfaces of the two fixed plates (51); the longitudinal telescopic rods (52) are symmetrically fixedly connected to the left inner wall of the box body (1) in a front-to-back manner; the two longitudinal telescopic rods (52) are respectively located inside the corresponding positions of the slide grooves (53).

6. The leather processing and cutting machine for automobile interior armrest according to claim 5, characterized in that: The pressing mechanism (6) comprises a placement plate (61), an upper buckle frame (62), a front counterweight frame (63), a handle (64) and a stamping die groove (65); the left side surface of the placement plate (61) is fixedly connected to the telescopic ends of the two longitudinal telescopic rods (52); the interiors of the two slide grooves (53) are slidably connected to the front and rear sides of a placement plate (61); the left side of the upper surface of the placement plate (61) is rotatably connected to the upper buckle frame (62) via a pin shaft; the right side surface of the upper buckle frame (62) is fixedly connected to the front counterweight frame (63); the middle part of the right side surface of the front counterweight frame (63) is fixedly connected to the handle (64); and the upper surface of the placement plate (61) is provided with a stamping die groove (65).

7. The leather processing and cutting machine for automobile interior armrest according to claim 3, characterized in that: It also includes a telescopic cylinder, which is fixedly connected to the lower inner wall of the box body (1), the telescopic end of the telescopic cylinder is fixedly connected to the lower surface of the lower displacement plate (39), and the air inlet of the telescopic cylinder is externally connected to an external air pump.

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