Air pressure rod with limiting function

Abstract

The utility model relates to the technical field of air pressure rods, and provides an air pressure rod with a limiting function, the air pressure rod comprises a fixed pipe and an air pressure rod movably mounted on the fixed pipe, a vertical groove and a limiting groove are formed in the fixed pipe, the vertical groove is communicated with the limiting groove, and an arc-shaped limiting frame is fixedly arranged on the air pressure rod. The air pressure bar fixing device has the advantages that the air pressure bar drives the arc-shaped limiting frames to be inserted into the limiting grooves along the vertical grooves so that the air pressure bar can be fixed to the fixing pipe, and the air pressure bar and the fixing pipe can be rapidly installed or detached; and the arc-shaped limiting frame is inserted into different limiting grooves, so that the height of the air pressure rod is adjusted.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas pressure rods, and in particular relates to a gas pressure rod with a limiting function. Background Art

[0002] The patent document of application number 202021499142.4 discloses a pneumatic rod sleeve with a limit. The utility model relates to the technical field of pneumatic rods and discloses a pneumatic rod sleeve with a limit, including a sleeve, the top of the sleeve is fixedly connected to an upper ring, the top of the upper ring is provided with a slot, the top of the side surface of the upper ring is fixedly connected to an upper sleeve, the upper sleeve is internally threaded with a bolt, the bottom end of the sleeve is fixedly connected to a lower ring, and the bottom of the lower ring is fixedly connected to a support rod. The pneumatic rod sleeve with a limit is provided with an upper ring at the top of the sleeve, a slot is provided inside the upper ring, an upper sleeve is provided on the side surface of the upper ring, a bolt is provided inside the upper sleeve, a lower sleeve is provided at the bottom end of the sleeve, and a threaded hole is provided inside the lower sleeve. To fix two different sleeves, you only need to put the support rod into the slot and then fix it with bolts. It is convenient and fast, and improves work efficiency.

[0003] However, the above technical solution requires a large number of bolts and nuts to connect and fix the pneumatic rod during long-term use, which is labor-intensive and inconvenient to adjust the installation height of the pneumatic rod. Utility Model Content

[0004] In view of this, the utility model provides a pneumatic rod with a limiting function, which drives the arc-shaped limiting frame to be inserted into the limiting groove along the vertical groove to fix the pneumatic rod on the fixed tube, thereby realizing rapid installation or disassembly between the pneumatic rod and the fixed tube, and inserting the arc-shaped limiting frame into different limiting grooves to realize the adjustment of the height of the pneumatic rod.

[0005] The technical solution is as follows: A pneumatic rod with a limiting function includes a fixed tube and a pneumatic rod movably installed on the fixed tube, the fixed tube is provided with a vertical groove and a limiting groove, the vertical groove is connected to the limiting groove, and an arc-shaped limiting frame is fixedly provided on the pneumatic rod, the arc-shaped limiting frame corresponds to the vertical groove and the limiting groove, and the arc-shaped limiting frame is driven by the pneumatic rod to be inserted into the limiting groove along the vertical groove to fix the pneumatic rod on the fixed tube, the number of the limiting grooves is at least two, and the arc-shaped limiting frame is inserted into different limiting grooves to adjust the height of the pneumatic rod.

[0006] During use of the above technical solution: the pneumatic rod drives the arc limit frame to be inserted into the limit groove along the vertical groove to fix the pneumatic rod on the fixed tube, thereby realizing rapid installation or disassembly between the pneumatic rod and the fixed tube, and the arc limit frame is inserted into different limit grooves to realize the adjustment of the height of the pneumatic rod.

[0007] Preferably, the number of the limiting grooves is two, and the two limiting grooves are evenly distributed linearly along the fixed tube.

[0008] Preferably, the number of the limiting grooves is four, and the four limiting grooves are evenly distributed linearly along the fixed tube.

[0009] Preferably, there are two groups of vertical grooves and limit grooves, and the two groups of vertical grooves and limit grooves are evenly distributed circumferentially on the fixed tube. There are also two groups of arc-shaped limit frames, and the two groups of arc-shaped limit frames are evenly distributed circumferentially on the pneumatic rod. Each group of arc-shaped limit frames corresponds to the vertical grooves and limit grooves.

[0010] Preferably, a fourth sliding cavity is provided on the pneumatic rod and the arc-shaped limit frame, a fourth piston component is sealed and slidably installed on the fourth sliding cavity, a fourth elastic component is provided between the fourth piston component and the fourth sliding cavity, and the fourth piston component corresponds to the vertical groove and the limit groove.

[0011] Preferably, the fourth sliding cavity includes a sliding cavity and a limit frame, the limit frame is fixedly mounted on the outer end of the sliding cavity, the fourth piston component includes a piston and a piston plate, the piston plate is fixed on the piston, the piston seal is slidably mounted in the sliding cavity, the piston plate slides through the limit frame, the fourth elastic component is movably mounted in the sliding cavity, and the piston is connected to the pneumatic rod through the fourth elastic component.

[0012] Preferably, a second sliding cavity is fixedly opened in the limiting groove of the fixed tube, and a second piston component is sealed and slidably installed in the second sliding cavity. The second piston component is connected to the fixed tube through a second elastic component, and the second piston component corresponds to the fourth piston component.

[0013] Preferably, a third sliding cavity is provided on the fixed tube, and a third piston is sealingly and slidingly installed in the third sliding cavity. The third piston is connected to the fixed tube through a third elastic component. A piston rod is provided on the third piston, and the piston rod is pushed out of the third sliding cavity by the third elastic component. The third sliding cavity is communicated with the second sliding cavity. Operating the piston rod to push the piston along the third sliding cavity will compress the air pressure in the third sliding cavity and the second sliding cavity, thereby pushing the second piston component to move along the second sliding cavity and retracting the fourth piston component into the fourth sliding cavity. Multiple third sliding cavities are sealed and connected through ventilation pipes.

[0014] During use of the above technical solution: under the action of the fourth elastic component, the fourth piston component is pushed to be inserted into the limiting groove, thereby improving the stability of the gas pressure rod installation and preventing the gas pressure rod from rotating, thereby achieving the phenomenon of the gas pressure rod falling off; the piston rod is operated to push the piston to move along the third sliding cavity to compress the air pressure in the third sliding cavity and the second sliding cavity, thereby pushing the second piston component to move along the second sliding cavity and retracting the fourth piston component into the fourth sliding cavity, thereby facilitating the disassembly of the gas pressure rod;

[0015] Preferably, an arc-shaped sliding cavity is fixedly provided in the limit groove of the fixed tube at one end away from the vertical groove, and an arc-shaped sliding rod is sealed and slidably installed in the arc-shaped sliding cavity. The arc-shaped sliding rod and the arc-shaped sliding cavity are connected by an arc-shaped elastic component, and a connecting block is fixedly provided at the end of the arc-shaped sliding rod, and the connecting block corresponds to the arc-shaped limit frame. The connecting quick row is provided with a slot, and the slot corresponds to the second piston component. The arc-shaped elastic component pushes the connecting block to contact the arc-shaped limit frame to limit the sliding of the arc-shaped limit frame in the limit groove.

[0016] Preferably, a first sliding cavity is fixedly provided on the fixed tube, a limiting frame is fixedly provided on the first sliding cavity, a first piston component is sealingly and slidingly installed in the first sliding cavity, the first piston component is connected to the fixed tube through a first elastic component, an end of the arc-shaped sliding cavity away from the arc-shaped sliding rod is fixedly and sealedly connected to an air supply pipe, the air supply pipe and the arc-shaped sliding cavity are sealed and connected through a vent hole, the air supply pipe and the first sliding cavity are sealed and connected, and the arc-shaped sliding rod moves along the arc-shaped sliding cavity to compress the air pressure in the arc-shaped sliding cavity, the air supply pipe and the first sliding cavity, thereby pushing the first piston component to move along the first sliding cavity to fix the gas pressure rod in the fixed tube;

[0017] During use, the above technical solution: the arc-shaped sliding rod moves along the arc-shaped sliding cavity, compressing the air pressure in the arc-shaped sliding cavity, the air pipe and the first sliding cavity, thereby pushing the first piston component to move along the first sliding cavity to fix the pneumatic rod in the fixed tube, further strengthening the fixation of the pneumatic rod and improving the stability of the pneumatic rod installation.

[0018] After adopting the above technical solution, the beneficial effects of the utility model are:

[0019] 1. The air pressure rod drives the arc limit frame to be inserted into the limit groove along the vertical groove to fix the air pressure rod on the fixed tube, so as to realize the rapid installation or removal between the air pressure rod and the fixed tube. The arc limit frame is inserted into different limit grooves to realize the height adjustment of the air pressure rod;

[0020] 2. Under the action of the fourth elastic component, the fourth piston component is pushed to be inserted into the limiting groove, thereby improving the stability of the gas pressure rod installation and preventing the gas pressure rod from rotating, thereby achieving the phenomenon of the gas pressure rod falling off. The piston rod is operated to push the piston to move along the third sliding cavity to compress the air pressure in the third sliding cavity and the second sliding cavity, thereby pushing the second piston component to move along the second sliding cavity and retracting the fourth piston component into the fourth sliding cavity, thereby facilitating the removal of the gas pressure rod;

[0021] 3. The arc-shaped sliding rod moves along the arc-shaped sliding cavity, compressing the air pressure in the arc-shaped sliding cavity, the air pipe and the first sliding cavity, thereby pushing the first piston component to move along the first sliding cavity to fix the gas pressure rod in the fixed tube, further strengthening the fixation of the gas pressure rod and improving the stability of the gas pressure rod installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 It is an exploded view of the utility model;

[0024] Figure 2 This is a partial exploded view of the gas pressure rod of the utility model;

[0025] Figure 3 This is a three-dimensional diagram of the fixed pipe of the utility model;

[0026] Figure 4 This is a cross-sectional view of the fixed pipe of the utility model;

[0027] Figure 5 This is a cross-sectional view of the fixed pipe of the utility model;

[0028] Figure 6 This is an exploded view of the fixed pipe of the utility model;

[0029] Figure 7 This is a three-dimensional diagram of the fixed pipe of the utility model;

[0030] Figure 8 This is a cross-sectional view of the fixed pipe of the utility model;

[0031] Figure 9 This is a partial perspective view of the third embodiment of the present utility model;

[0032] Figure 10 This is a partial perspective view of the third embodiment of the present utility model;

[0033] Figure 11 This is a partial cross-sectional view of the third embodiment of the present utility model;

[0034] In the figure, 1, fixed tube; 2, vertical groove; 3, limiting groove; 4, first sliding cavity; 5, limiting frame; 6, second sliding cavity; 7, third sliding cavity; 8, vent pipe; 9, arcuate sliding cavity; 10, arcuate sliding rod; 11, connecting block; 12, slot; 13, arcuate elastic component; 14, vent hole; 15, air pipe; 16, gas pressure rod; 17, arcuate limiting frame; 18, fourth sliding cavity; 19, fourth piston component; 20, fourth elastic component; 21, first piston component; 22, first elastic component; 23, second piston component; 24, second elastic component; 25, piston rod; 26, third piston; 27, third elastic component;

[0035] 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 technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0036] like Figures 1 to 11 As shown, a pneumatic rod with a limiting function includes a fixed tube 1 and a pneumatic rod 16 movably installed on the fixed tube 1, the fixed tube 1 is provided with a vertical groove 2 and a limiting groove 3, the vertical groove 2 is connected to the limiting groove 3, and an arc-shaped limiting frame 17 is fixedly provided on the pneumatic rod 16, the arc-shaped limiting frame 17 corresponds to the vertical groove 2 and the limiting groove 3, and the arc-shaped limiting frame 17 is driven by the pneumatic rod 16 to be inserted into the limiting groove 3 along the vertical groove 2 to fix the pneumatic rod 16 on the fixed tube 1, the number of the limiting grooves 3 is at least two, and the arc-shaped limiting frame 17 is inserted into different limiting grooves 3 to adjust the height of the pneumatic rod 16.

[0037] There are two limiting grooves 3 , and the two limiting grooves 3 are linearly and evenly distributed along the fixing tube 1 .

[0038] There are four limiting grooves 3 , and the four limiting grooves 3 are linearly and evenly distributed along the fixing tube 1 .

[0039] There are two groups of vertical grooves 2 and limit grooves 3, and the two groups of vertical grooves 2 and limit grooves 3 are evenly distributed circumferentially on the fixed tube 1. There are also two groups of arc-shaped limit frames 17, and the two groups of arc-shaped limit frames 17 are evenly distributed circumferentially on the pneumatic rod 16. Each group of arc-shaped limit frames 17 corresponds to the vertical grooves 2 and the limit grooves 3.

[0040] In actual operation: the arc limit frame 17 is driven by the pneumatic rod 16 to move along the vertical groove 2, and then the pneumatic rod 16 is rotated to drive the arc limit frame 17 to be inserted into the limit groove 3 to fix the pneumatic rod 16 on the fixed tube 1, thereby realizing the rapid installation or disassembly between the pneumatic rod 16 and the fixed tube 1, and the arc limit frame 17 is inserted into different limit grooves 3 to realize the adjustment of the height of the pneumatic rod 16. Example

[0041] Based on the first embodiment, Figures 1 to 11 As shown, a fourth sliding cavity 18 is provided on the pneumatic rod 16 and the arc-shaped limit frame 17, and a fourth piston component 19 is sealed and slidably installed on the fourth sliding cavity 18. A fourth elastic component 20 is provided between the fourth piston component 19 and the fourth sliding cavity 18, and the fourth piston component 19 corresponds to the vertical groove 2 and the limit groove 3.

[0042] The fourth sliding cavity 18 includes a sliding cavity and a limit frame 5, the limit frame 5 is fixedly installed on the outer end of the sliding cavity, the fourth piston component 19 includes a piston and a piston plate, the piston plate is fixed on the piston, the piston seal is slidably installed in the sliding cavity, the piston plate slides through the limit frame 5, the fourth elastic component 20 is movably installed in the sliding cavity, and the piston is connected to the pneumatic rod 16 through the fourth elastic component 20.

[0043] Specifically: the fourth elastic component 20 is a return spring, one end of which is fixedly connected to the piston, and the other end of which is fixedly connected to the gas pressure rod 16;

[0044] In actual operation: the fourth elastic component 20 pushes the piston plate out of the fourth sliding cavity 18, and the limiting frame 5 prevents the piston from leaving the fourth sliding cavity 18. When the gas pressure rod 16 moves along the vertical groove 2, the piston plate retracts into the fourth sliding cavity 18 and compresses the fourth elastic component 20. When the arc-shaped limiting frame 17 is inserted into the limiting groove 3, the fourth elastic component 20 pushes the piston plate into the limiting groove 3 under the action of the fourth elastic component 20, preventing the gas pressure rod 16 from rotating in the limiting groove 3.

[0045] A second sliding cavity 6 is fixedly opened in the limiting groove 3 of the fixed tube 1, and a second piston component 23 is sealed and slidably installed in the second sliding cavity 6. The second piston component 23 is connected to the fixed tube 1 through a second elastic component 24. The second piston component 23 corresponds to the fourth piston component 19.

[0046] Specifically: the second piston component 23 has the same structure as the fourth piston component 19 , and the second elastic component 24 has the same structure as the fourth elastic component 20 ;

[0047] In actual operation: the fourth piston member 19 is retracted into the second sliding cavity 6 by the second elastic member 24;

[0048] A third sliding cavity 7 is provided on the fixed tube 1, and a third piston 26 is sealed and slidably installed in the third sliding cavity 7. The third piston 26 is connected to the fixed tube 1 through a third elastic component 27. A piston rod 25 is provided on the third piston 26, and the piston rod 25 is pushed out of the third sliding cavity 7 by the third elastic component 27. The third sliding cavity 7 is communicated with the second sliding cavity 6. Operating the piston rod 25 to push the piston along the third sliding cavity 7 will compress the air pressure in the third sliding cavity 7 and the second sliding cavity 6, thereby pushing the second piston component 23 to move along the second sliding cavity 6 and retracting the fourth piston component 19 into the fourth sliding cavity 18. Multiple third sliding cavities 7 are sealed and communicated through the vent pipe 8.

[0049] Specifically: the vent pipe 8 and the third sliding cavity 7 are both located between the third piston 26 component and the fixed pipe 1 away from one end of the piston plate;

[0050] Specifically: the third elastic component 27 is a return spring, one end of which is fixedly connected to the third piston 26, and the other end of which is fixedly connected to the fixed tube 1;

[0051] In actual operation: under the action of the fourth elastic component 20, the fourth piston component 19 is pushed to be inserted into the limiting groove 3, thereby improving the stability of the installation of the gas pressure rod 16 and preventing the gas pressure rod 16 from rotating, thereby achieving the phenomenon of the gas pressure rod 16 falling off. The piston rod 25 is operated to push the piston to move along the third sliding cavity 7 to compress the air pressure in the third sliding cavity 7 and the second sliding cavity 6, thereby pushing the second piston component 23 to move along the second sliding cavity 6, and retracting the fourth piston component 19 into the fourth sliding cavity 18, thereby facilitating the removal of the gas pressure rod 16. Example

[0052] On the basis of Example 2, an arc-shaped sliding cavity 9 is fixedly provided in the limit groove 3 of the fixed tube 1 at one end away from the vertical groove 2, and an arc-shaped sliding rod 10 is sealed and slidably installed in the arc-shaped sliding cavity 9. The arc-shaped sliding rod 10 is connected to the arc-shaped sliding cavity 9 by an arc-shaped elastic component 13, and a connecting block 11 is fixedly provided at the end of the arc-shaped sliding rod 10. The connecting block 11 corresponds to the arc-shaped limit frame 17, and the connecting quick row is provided with a slot 12, and the slot 12 corresponds to the second piston component 23. The arc-shaped elastic component 13 pushes the connecting block 11 to contact the arc-shaped limit frame 17 to limit the sliding of the arc-shaped limit frame 17 in the limit groove 3.

[0053] Specifically: the arc-shaped elastic component 13 is a reset spring, one end of the arc-shaped elastic component 13 is fixedly connected to the arc-shaped sliding rod 10, and the other end of the arc-shaped elastic component 13 is fixedly connected to the arc-shaped sliding cavity 9;

[0054] A first sliding cavity 4 is fixedly provided on the fixed tube 1, and a limiting frame 5 is fixedly provided on the first sliding cavity 4. A first piston component 21 is sealed and slidably installed in the first sliding cavity 4, and the first piston component 21 is connected to the fixed tube 1 through a first elastic component 22. The end of the arc-shaped sliding cavity 9 away from the arc-shaped sliding rod 10 is fixedly and sealedly connected to the air supply pipe 15, and the air supply pipe 15 is sealed and connected to the arc-shaped sliding cavity 9 through the air vent 14. The air supply pipe 15 is sealed and connected to the first sliding cavity 4. The arc-shaped sliding rod 10 moves along the arc-shaped sliding cavity 9, and the air pressure in the arc-shaped sliding cavity 9, the air supply pipe 15 and the first sliding cavity 4 is compressed, thereby pushing the first piston component 21 to move along the first sliding cavity 4 to fix the gas pressure rod 16 in the fixed tube 1.

[0055] Specifically, the first piston component 21 and the fourth piston component 19 have the same structure, the first sliding cavity 4 and the fourth sliding cavity 18 have the same structure, the first elastic component 22 and the fourth elastic component 20 have the same mechanism, the air supply pipe 15 is located between the first piston component 21 and the fixed pipe 1 at one end away from the limiting frame 5, and the multiple arc-shaped sliding cavities 9 are fixedly and sealedly connected through the air supply pipe 15;

[0056] In actual operation: the first piston component 21 is retracted into the first sliding cavity 4 through the first elastic component 22, and when the pneumatic rod 16 drives the arc limit frame 17 to move along the limit groove 3, the arc limit frame 17 pushes the connecting block 11 to move, and the arc sliding rod 10 is pushed to move through the connecting block 11, and the arc sliding rod 10 moves along the arc sliding cavity 9, compressing the air pressure in the arc sliding cavity 9, the air pipe 15 and the first sliding cavity 4, thereby pushing the first piston component 21 to move along the first sliding cavity 4 to fix the pneumatic rod 16 in the fixed tube 1, further strengthening the fixation of the pneumatic rod 16, and improving the stability of the installation of the pneumatic rod 16.

[0057] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements shall fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A pneumatic rod with a limiting function, comprising a fixed tube (1) and a pneumatic rod (16) movably mounted on the fixed tube (1), characterized in that: The fixed tube (1) is provided with a vertical groove (2) and a limiting groove (3), the vertical groove (2) is communicated with the limiting groove (3), and the pneumatic rod (16) is fixedly provided with an arc-shaped limiting frame (17), the arc-shaped limiting frame (17) corresponds to the vertical groove (2) and the limiting groove (3), and the pneumatic rod (16) is driven by the arc-shaped limiting frame (17) to be inserted into the limiting groove (3) along the vertical groove (2) to fix the pneumatic rod (16) on the fixed tube (1), the number of the limiting grooves (3) is at least two, and the arc-shaped limiting frame (17) is inserted into different limiting grooves (3) to achieve the adjustment of the height of the pneumatic rod (16).

2. The pneumatic rod (16) with a limiting function according to claim 1, characterized in that: The number of the limiting grooves (3) is two, and the two limiting grooves (3) are linearly and evenly distributed along the fixed tube (1).

3. The pneumatic rod (16) with a limiting function according to claim 2, characterized in that: The number of the limiting grooves (3) is four, and the four limiting grooves (3) are linearly and evenly distributed along the fixed tube (1).

4. The pneumatic rod (16) with a limiting function according to claim 3, characterized in that: The number of the vertical grooves (2) and the limiting grooves (3) are both two groups, and the two groups of the vertical grooves (2) and the limiting grooves (3) are circumferentially evenly distributed on the fixed tube (1). The number of the arc-shaped limiting frames (17) is also two groups, and the two groups of the arc-shaped limiting frames (17) are circumferentially evenly distributed on the pneumatic rod (16), and each group of the arc-shaped limiting frames (17) corresponds to the vertical grooves (2) and the limiting grooves (3).

5. A gas pressure rod (16) with a limiting function according to any one of claims 1 to 4, characterized in that: A fourth sliding cavity (18) is provided on the pneumatic rod (16) and the arc-shaped limiting frame (17); a fourth piston component (19) is sealed and slidably mounted on the fourth sliding cavity (18); a fourth elastic component (20) is provided between the fourth piston component (19) and the fourth sliding cavity (18); and the fourth piston component (19) corresponds to the vertical groove (2) and the limiting groove (3).

6. The gas pressure rod (16) with a limiting function according to claim 5, characterized in that: The fourth sliding cavity (18) includes a sliding cavity and a limiting frame (5), the limiting frame (5) is fixedly mounted on the outer end of the sliding cavity, the fourth piston component (19) includes a piston and a piston plate, the piston plate is fixed on the piston, the piston seal is slidably mounted in the sliding cavity, the piston plate slides through the limiting frame (5), the fourth elastic component (20) is movably mounted in the sliding cavity, and the piston is connected to the pneumatic rod (16) through the fourth elastic component (20).

7. The pneumatic rod (16) with a limiting function according to claim 6, characterized in that: A second sliding cavity (6) is fixedly provided in the limiting groove (3) of the fixed tube (1), a second piston component (23) is sealed and slidably installed in the second sliding cavity (6), the second piston component (23) is connected to the fixed tube (1) via a second elastic component (24), and the second piston component (23) corresponds to the fourth piston component (19).

8. The pneumatic rod (16) with a limiting function according to claim 7, characterized in that: The fixed tube (1) is provided with a third sliding cavity (7), and a third piston (26) is sealed and slidably installed in the third sliding cavity (7). The third piston (26) is connected to the fixed tube (1) through a third elastic component (27). A piston rod (25) is provided on the third piston (26), and the piston rod (25) is pushed to extend out of the third sliding cavity (7) through the third elastic component (27). The third sliding cavity (7) is connected with the second sliding cavity (6). The piston rod (25) is operated to push the piston along the third sliding cavity (7) to compress the air pressure in the third sliding cavity (7) and the second sliding cavity (6), thereby pushing the second piston component (23) to move along the second sliding cavity (6) and retracting the fourth piston component (19) into the fourth sliding cavity (18). The plurality of third sliding cavities (7) are sealed and connected through a vent pipe (8).

9. The gas pressure rod (16) with a limiting function according to claim 8, characterized in that: An arc-shaped sliding cavity (9) is fixedly provided at one end of the limiting groove (3) of the fixed tube (1) away from the vertical groove (2), and an arc-shaped sliding rod (10) is sealed and slidably installed in the arc-shaped sliding cavity (9). The arc-shaped sliding rod (10) and the arc-shaped sliding cavity (9) are connected via an arc-shaped elastic component (13). A connecting block (11) is fixedly provided at the end of the arc-shaped sliding rod (10), and the connecting block (11) corresponds to the arc-shaped limiting frame (17). The connecting fast row is provided with a slot (12), and the slot (12) corresponds to the second piston component (23). The arc-shaped elastic component (13) pushes the connecting block (11) to contact the arc-shaped limiting frame (17), thereby limiting the sliding of the arc-shaped limiting frame (17) in the limiting groove (3).

10. The gas pressure rod (16) with a limiting function according to claim 9, characterized in that: A first sliding cavity (4) is fixedly provided on the fixed tube (1), a limiting frame (5) is fixedly provided on the first sliding cavity (4), a first piston component (21) is sealed and slidably installed in the first sliding cavity (4), the first piston component (21) is connected to the fixed tube (1) through a first elastic component (22), the end of the arc-shaped sliding cavity (9) away from the arc-shaped sliding rod (10) is fixedly and sealedly connected to the air supply pipe (15), the air supply pipe (15) and the arc-shaped sliding cavity (9) are sealed and connected through the vent hole (14), the air supply pipe (15) and the first sliding cavity (4) are sealed and connected, and the arc-shaped sliding rod (10) moves along the arc-shaped sliding cavity (9), compressing the air pressure in the arc-shaped sliding cavity (9), the air supply pipe (15) and the first sliding cavity (4), thereby pushing the first piston component (21) to move along the first sliding cavity (4) to fix the air pressure rod (16) in the fixed tube (1).

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