Automatic sealing pneumatic pressure maintaining jig capable of preventing gas leakage

Abstract

The invention relates to the technical field of jigs, and discloses an automatic sealing pneumatic pressure maintaining jig capable of preventing gas leakage, the automatic sealing pneumatic pressure maintaining jig comprises a base, a rotating arm and a lower punch, the rotating arm is rotatably connected to the surface of the base, the lower punch is rotatably connected to the end, away from the base, of the rotating arm, and a gas path connector is fixedly connected to the middle of the rotating arm; a fixing assembly used for fixing the gas leakage prevention jig is arranged on the gas circuit connector, a wrapping assembly used for preventing gas leakage is arranged on the gas circuit connector, an electric telescopic rod is electrically controlled by a gas pressure controller to stretch out and draw back to drive a second wrapping clamp to wrap an external gas pipe, and the gas leakage position is sealed through the electric telescopic rod and the second wrapping clamp. Gas loss and environmental pollution can be reduced, meanwhile, safety accidents such as fire disasters, explosion and poisoning caused by gas leakage are avoided, then serious threats to safety of factories and operators are avoided, the risk of the accidents can be reduced by sealing the gas leakage position, and harm to the factories and the operators is avoided.

Description

Technical Field

[0001] This invention relates to the field of fixture technology, specifically to an automatic sealing pneumatic pressure-maintaining fixture with gas leakage prevention. Background Technology

[0002] A pneumatic pressure-holding fixture is a tool used to maintain stable pressure in a pneumatic system. With the continuous development of industrial automation and pneumatic technology, pneumatic pressure-holding fixtures have been widely used in many fields, such as automobile manufacturing, machining, medical devices, and packaging machinery.

[0003] However, existing pressure-holding fixtures still have some problems. Due to the instability and complexity of pneumatic systems, gas leakage is often a problem that plagues enterprises and operators. Gas leakage is usually caused by loose connections of pneumatic pressure-holding fixtures and displacement of air pipes during long-term use. Loose air pipes can cause pressure fluctuations in the air pipes, making the pressure of pneumatic equipment or systems unstable. This phenomenon can lead to problems such as decreased equipment performance, unstable production processes, and decreased product quality. At the same time, loose air pipe connections can also lead to gas pipeline explosions or gas leaks causing fires, which will pose a serious threat to factory safety and the lives of employees.

[0004] At the same time, gas leaks can damage gas pipes and related facilities, shorten their service life, and increase maintenance and replacement costs. This will increase the company's operating costs and equipment replacement frequency, affecting the stability and efficiency of the production process. Furthermore, gas leaks can cause production to stop, forcing the production process to be interrupted due to gas pipe damage, resulting in economic and reputational losses for the company.

[0005] To address this, an automatic sealing pneumatic pressure-maintaining fixture with gas leakage prevention is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide an automatic sealing pneumatic pressure-maintaining fixture with gas leakage prevention, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an automatic sealing pneumatic pressure-holding fixture with gas leakage prevention, comprising a base, a rotating arm, and a lower punch. The rotating arm is rotatably connected to the surface of the base, and the lower punch is rotatably connected to the end of the rotating arm away from the base. An air passage connector is fixedly connected to the middle of the rotating arm. A fixing component for fixing the gas leakage prevention fixture is provided on the air passage connector, and a wrapping component for preventing gas leakage is provided on the air passage connector.

[0008] The fixing component includes a protective housing, which is fixedly connected to the surface of the gas connector. A circular clamp is slidably connected inside the protective housing, and a second circular clamp is slidably connected inside the protective housing.

[0009] The package includes a pressure controller, which is fixedly connected to the surface of the air connector. The air connector has a pressure regulating groove inside, and a pressure regulating plate is slidably connected inside the pressure regulating groove.

[0010] Preferably, the fixing assembly further includes a rotating housing, which is fixedly connected to the surface of the protective housing. A gear is rotatably connected inside the rotating housing, and a cross groove is formed on the surface of the gear. A spring is fixedly connected to the inner wall of the rotating housing. A cross guide post is fixedly connected to the end of the spring away from the inner wall of the rotating housing. The cross guide post is slidably connected inside the cross groove. A receiving rod is fixedly connected to the end of the cross guide post away from the spring. The receiving rod passes through the side of the rotating housing away from the air passage connector. A limiting seat is fixedly connected to the inner wall of the rotating housing. A gear two is symmetrically rotatably connected to the inner wall of the rotating housing. A rotating shaft is rotatably connected to the inner wall of the rotating housing, passing through both sides of the rotating housing. A knob one is fixedly connected to the side of the rotating shaft away from the rotating housing, and a knob two is fixedly connected to the side of the receiving rod away from the air passage connector.

[0011] Preferably, a gear three is fixedly connected to the side of the rotating shaft near the protective housing, and sliding rails are symmetrically fixedly connected to the inner wall of the protective housing. A rack one is slidably connected to the surface of the sliding rail on the side away from the air passage connector, and a rack two is slidably connected to the surface of the sliding rail on the side near the air passage connector. The surface of rack one is fixedly connected to the surface of circular clamp one, and the surface of rack two is fixedly connected to the surface of circular clamp two. A sliding groove is symmetrically opened on the inner wall of the protective housing on the side away from the rotating housing, and the inside of the sliding groove is slidably connected to the surfaces of circular clamp one and circular clamp two.

[0012] Preferably, the packaging assembly further includes a first packaging clamp, which is fixedly connected to the surface of the protective housing away from the lower punch. The bottom of the first packaging clamp is symmetrically and linearly arranged with electrically operated telescopic rods fixedly connected at equal intervals. The bottom of each of the electrically operated telescopic rods is fixedly connected to a second packaging clamp. A connecting shaft is fixedly connected to the surface of the second packaging clamp. A first groove is formed on the surface of the protective housing, through which the connecting shaft passes. A second groove is formed on the surface of the air connector, with the connecting shaft slidably connected to the second groove. The end of the connecting shaft away from the second packaging clamp passes through the second groove and is fixedly connected to the surface of the air pressure regulating plate.

[0013] Preferably, the air connector has an external air pipe connected to its interior, which serves to obtain a power source through the external air pipe.

[0014] Preferably, the pneumatic controller electrically controls the extension and retraction of the electric telescopic rod, thus enabling the pneumatic controller to electrically control the extension and retraction of the electric telescopic rod by detecting the pneumatic pressure.

[0015] Preferably, the two gears 2 mesh with each other, and both gears 2 mesh with gear 1, which serves to transmit power through the meshing of the two gears 2 and the meshing of gears 2 with gear 1. A protrusion is fixedly connected to the surface of the cross guide post, which serves to drive the protrusion to abut against the limiting seat through the cross guide post. The outer walls of the two gears 2 are fixedly connected with abutment hands for fixing the rotating shaft, which serve to hold the external air tube.

[0016] Preferably, the shape of the connecting shaft is adapted to the shapes of groove one and groove two, so that the connecting shaft can move through groove one and groove two.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. By fixing the external gas pipes with two circular clamps, it is possible to prevent the external gas pipes from moving or vibrating accidentally during the production process, thereby avoiding gas leakage and other safety problems. In addition, fixing the external gas pipes can make the gas supply more stable and continuous, thereby improving production efficiency and extending the service life of the equipment by reducing the time cost and frequency of maintenance and replacement of gas pipes.

[0019] 2. By electrically controlling the extension and retraction of the electric telescopic rod through the pneumatic controller, the second wrapping clamp wraps around the external air pipe, sealing the leak with the electric telescopic rod and the second wrapping clamp. This reduces gas loss and environmental pollution, and prevents safety accidents such as fire, explosion, and poisoning caused by gas leaks. This avoids serious threats to the safety of the factory and operators. By sealing the leak, the risk of these accidents can be reduced, and harm to the factory and operators can be avoided.

[0020] 3. By using the connecting shaft to drive the pressure regulating plate to block the output end of the external gas pipe, gas leakage from the external gas pipe can be effectively prevented, thereby reducing gas loss and environmental pollution. At the same time, by reducing the cross-sectional area, the gas pressure is increased, which can maintain a higher gas flow rate and pressure, thereby improving the efficiency and capacity of the production process, maintaining the normal operation of the equipment, ensuring the stability and continuity of gas supply, and thus enhancing the safety and stability of the equipment. Attached Figure Description

[0021] Figure 1This is a three-dimensional schematic diagram of the main structure of the present invention;

[0022] Figure 2 This is a three-dimensional schematic diagram of the fixing component structure of the present invention;

[0023] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0024] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B;

[0025] Figure 5 This is a three-dimensional schematic diagram of the internal connection relationship of the fixing component of the present invention;

[0026] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point C;

[0027] Figure 7 This is a partially enlarged three-dimensional schematic diagram of the fixing component of the present invention;

[0028] Figure 8 This is a partially enlarged three-dimensional schematic diagram of the packaging component of the present invention;

[0029] Figure 9 This is a three-dimensional cross-sectional view of the structure of the packaging component of the present invention;

[0030] Figure 10 For the present invention Figure 9 Enlarged schematic diagram of the structure at point D.

[0031] In the picture:

[0032] 11. Base; 12. Rotating arm; 13. Lower punch; 14. Air connection connector;

[0033] 2. Fixed assembly; 21. Protective housing; 22. Rotating housing; 23. Gear 1; 24. Cross groove; 25. Spring; 26. Cross guide post; 27. Support rod; 28. Limit seat; 29. ​​Gear 2; 210. Rotating shaft; 211. Knob 1; 212. Knob 2; 213. Gear 3; 214. Sliding rail; 215. Rack 1; 216. Rack 2; 217. Circular clamp 1; 218. Circular clamp 2; 219. Slide groove;

[0034] 3. Packaging assembly; 31. Packaging clamp one; 32. Electric telescopic rod; 33. Packaging clamp two; 34. Air pressure controller; 35. Connecting shaft; 36. Pressure transformer groove; 37. Air pressure regulating plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0036] Example

[0037] Please see Figures 1 to 10 An automatic sealing pneumatic pressure-holding fixture with gas leakage prevention includes a base 11, a rotating arm 12, and a lower punch 13. The rotating arm 12 is rotatably connected to the surface of the base 11, and the lower punch 13 is rotatably connected to the end of the rotating arm 12 away from the base 11. An air connector 14 is fixedly connected to the middle of the rotating arm 12. An external air pipe is connected inside and outside the air connector 14, which serves to obtain a power source through the external air pipe. A fixing component 2 for fixing the gas leakage prevention fixture is provided on the air connector 14, and a wrapping component 3 for preventing gas leakage is provided on the air connector 14.

[0038] The fixing component 2 includes a protective housing 21, which is fixedly connected to the surface of the gas connector 14. A circular clamp 1 217 is slidably connected inside the protective housing 21, and a circular clamp 218 is slidably connected inside the protective housing 21.

[0039] The package assembly 3 includes a pressure controller 34, which is fixedly connected to the surface of the air connector 14. The pressure controller 34 electrically controls the extension and retraction of the electric telescopic rod 32, thus playing the role of the pressure controller 34 in electrically controlling the extension and retraction of the electric telescopic rod 32 by detecting the air pressure. The air connector 14 has a pressure regulating groove 36 inside, and a pressure regulating plate 37 is slidably connected inside the pressure regulating groove 36.

[0040] The fixed assembly 2 also includes a rotating housing 22, which is fixedly connected to the surface of the protective housing 21. A gear 23 is rotatably connected inside the rotating housing 22. A cross groove 24 is formed on the surface of the gear 23. A spring 25 is fixedly connected to the inner wall of the rotating housing 22. A cross guide post 26 is fixedly connected to the end of the spring 25 away from the inner wall of the rotating housing 22. The cross guide post 26 is slidably connected inside the cross groove 24. A receiving rod 27 is fixedly connected to the end of the cross guide post 26 away from the spring 25. The receiving rod 27 passes through the side of the rotating housing 22 away from the air connector 14. A limiting seat 28 is fixedly connected to the inner wall of the rotating housing 22. Two gears 29 are symmetrically rotatably connected to the inner wall of the rotating housing 22. The two gears 29 mesh with each other. Gear 29 meshes with gear 23, transmitting power through the meshing of the two gears 29 and the meshing of the two gears 29 with gear 23. A protrusion is fixedly connected to the surface of the cross guide post 26, which drives the protrusion to abut against the limit seat 28. The outer walls of the two gears 29 are fixedly connected to the abutment for fixing the rotating shaft 210, which clamps the external air tube. The rotating shaft 210 is rotatably connected to the inner wall of the rotating housing 22, and the rotating shaft 210 passes through both sides of the rotating housing 22. A knob 211 is fixedly connected to the side of the rotating shaft 210 away from the rotating housing 22. A knob 212 is fixedly connected to the side of the receiving rod 27 away from the air connector 14.

[0041] A gear 213 is fixedly connected to the side of the rotating shaft 210 near the protective housing 21. A sliding rail 214 is symmetrically fixedly connected to the inner wall of the protective housing 21. A rack 215 is slidably connected to the surface of the sliding rail 214 away from the air connector 14. A rack 216 is slidably connected to the surface of the sliding rail 214 near the air connector 14. The surface of rack 215 is fixedly connected to the surface of circular clamp 217. The surface of rack 216 is fixedly connected to the surface of circular clamp 218. A sliding groove 219 is symmetrically opened on the inner wall of the protective housing 21 away from the rotating housing 22. The sliding groove 219 is slidably connected to the surfaces of circular clamp 217 and circular clamp 218.

[0042] The packaging assembly 3 also includes a first packaging clamp 31, which is fixedly connected to the protective housing 21 on the side surface away from the lower punch 13. The bottom of the first packaging clamp 31 is symmetrically and linearly arranged with electric telescopic rods 32 fixedly connected. The bottom of each electric telescopic rod 32 is fixedly connected with a second packaging clamp 33. A connecting shaft 35 is fixedly connected to the surface of the second packaging clamp 33. The shape of the connecting shaft 35 is adapted to the shape of the first and second grooves, so that the connecting shaft 35 can move through the first and second grooves. A first groove is opened on the surface of the protective housing 21, and the connecting shaft 35 passes through the first groove. A second groove is opened on the surface of the air connector 14, and the connecting shaft 35 is slidably connected to the second groove. The end of the connecting shaft 35 away from the second packaging clamp 33 passes through the second groove and is fixedly connected to the surface of the air pressure regulating plate 37.

[0043] The following is the overall working principle of the above embodiments:

[0044] The following is the initial state: the air connector 14 is not connected to the external air pipe at this time, the spring 25 is in the extended state through the cross guide post 26, the protrusion on the surface of the cross guide post 26 is not in contact with the outer wall of the limit seat 28, the two gears 29 are not gripping the rotating shaft 210, the electric telescopic rod 32 is in the extended state through the air pressure controller 34, the circular clamp 218 is located at the top of the inner cavity of the protective housing 21, the circular clamp 217 is located at the bottom of the inner cavity of the protective housing 21, and the air pressure regulating plate 37 is located inside the pressure transformer groove 36 through the connecting shaft 35.

[0045] Overall equipment installation:

[0046] The operator manually inserts the external air tube into the air connector 14, then turns knob 211. The rotation of knob 211 causes shaft 210 to rotate, which in turn causes gear 213 to rotate. Gear 213 then moves racks 215 and 216, which mesh with it, along the surface of the sliding track 214. Because racks 215 and 216 are located on opposite sides of gear 213, their movements are opposite. This opposite movement causes rack 215 to move the circular clamp 217 within the groove 219. The top of the inner cavity of the protective housing 21 begins to move, and the rack 216 drives the circular clamp 218 to move towards the bottom of the inner cavity of the protective housing 21 inside the slide groove 219. At this time, the circular clamps 217 and 218 will come into contact with the external air pipe and firmly fix the external air pipe. By fixing the external air pipe with the circular clamps 217 and 218, it is possible to prevent the external air pipe from moving or vibrating accidentally during the production process, thereby avoiding gas leakage and other safety problems. In addition, the fixed external air pipe can make the gas supply more stable and continuous, thereby improving production efficiency and extending the service life of the equipment by reducing the time cost and frequency of maintenance and replacement of air pipes.

[0047] The operator first presses knob 212 towards the rotating housing 22. At this time, knob 212 compresses spring 25 through the receiving rod 27 and the cross guide post 26. Then, the operator manually rotates knob 212 counterclockwise, causing the protrusion on the cross guide post 26 to rotate synchronously. During this process, the protrusion on the cross guide post 26 will engage with the limiting seat 28. At this point, the operator stops rotating knob 212. When knob 212 is not under force, spring 25 will tend to stretch elastically. However, because the protrusion is in contact with the limiting seat 28, and the limiting seat 28 restricts the stretching of spring 25, causing the cross guide post 26 to move towards the side closer to knob 212, spring 25 remains in a compressed state.

[0048] The operator then placed the material on top of the base 11 and started the entire device.

[0049] When the trachea is leaking air:

[0050] After a certain period of operation, the external air hose may leak due to aging, wear, or poor quality. At this time, the airflow inside the external air hose will leak outwards from the connection point between the external air hose and the air connector 14. Simultaneously, air will enter the external air hose through the leak, rubbing against the air inside the hose. This friction will generate vibrations, producing sound. The air pressure generated by the leaking airflow will be sensed by the air pressure controller 34. The air pressure controller 34 will then electrically control the electric telescopic rod 32 to retract, which will in turn cause the second wrapping clamp 33 to retract synchronously. The external air pipe is then firmly wrapped, stabilizing the air pressure inside the protective housing 21. The electric telescopic rod 32 is then electrically controlled by the air pressure controller 34 to extend and retract, causing the second wrapping clamp 33 to wrap around the external air pipe. This seals the leak with the electric telescopic rod 32 and the second wrapping clamp 33, reducing gas loss and environmental pollution. It also prevents safety accidents such as fires, explosions, and poisoning caused by gas leaks, thus avoiding serious threats to the safety of the factory and operators. By sealing the leak, the risk of these accidents can be reduced, preventing harm to the factory and operators.

[0051] However, due to air leakage in the external air pipe, air is lost, resulting in a decrease in air pressure. Simultaneously, the movement of the second clamp 33 drives the connecting shaft 35 to move synchronously, causing the connecting shaft 35 to bring the pressure regulating plate 37 out from inside the pressure transformer 36. At this time, the pressure regulating plate 37 blocks part of the output end of the external air pipe. As the gas flows through the external air pipe, the cross-sectional area of ​​the pipe decreases, the flow velocity increases, and the gas pressure also increases accordingly. Due to the increased flow velocity, the friction between gas molecules increases, leading to a rise in pressure, thereby achieving air pressure compensation for the external air pipe. By using the connecting shaft 35 to drive the pressure regulating plate 37 to block the output end of the external air pipe, gas leakage from the external air pipe can be effectively prevented, thereby reducing gas loss and environmental pollution. At the same time, by reducing the cross-sectional area and increasing the air pressure, a higher gas flow rate and pressure can be maintained, thereby improving the efficiency and capacity of the production process, maintaining the normal operation of the equipment, ensuring the stability and continuity of the gas supply, and thus enhancing the safety and stability of the equipment.

[0052] After the process is completed, the operator manually shuts off the pressure-holding device and replaces the external air pipe.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic sealing pneumatic pressure-holding fixture with gas leakage prevention, comprising a base (11), a rotating arm (12), and a lower punch (13), wherein the rotating arm (12) is rotatably connected to the surface of the base (11), the lower punch (13) is rotatably connected to the end of the rotating arm (12) away from the base (11), and an air connector (14) is fixedly connected to the middle of the rotating arm (12), characterized in that: The gas connector (14) is provided with a fixing component (2) for fixing the gas leak prevention fixture, and the gas connector (14) is provided with a wrapping component (3) for preventing gas leakage. The fixing component (2) includes a protective housing (21), which is fixedly connected to the surface of the gas connector (14). A circular clamp (217) is slidably connected inside the protective housing (21), and a circular clamp (218) is slidably connected inside the protective housing (21). The package assembly (3) includes a pressure controller (34), which is fixedly connected to the surface of the air connector (14). The air connector (14) has a pressure regulating groove (36) inside, and a pressure regulating plate (37) is slidably connected inside the pressure regulating groove (36).

2. The automatic sealing pneumatic pressure-maintaining fixture with gas leakage prevention according to claim 1, characterized in that: The fixing component (2) further includes a rotating housing (22), which is fixedly connected to the surface of the protective housing (21). A gear (23) is rotatably connected inside the rotating housing (22). A cross groove (24) is formed on the surface of the gear (23). A spring (25) is fixedly connected to the inner wall of the rotating housing (22). A cross guide post (26) is fixedly connected to the end of the spring (25) away from the inner wall of the rotating housing (22). The cross guide post (26) is slidably connected inside the cross groove (24). A receiving element is fixedly connected to the end of the cross guide post (26) away from the spring (25). A rod (27) is inserted through the side of the rotating housing (22) away from the air connector (14). A limiting seat (28) is fixedly connected to the inner wall of the rotating housing (22). A gear two (29) is symmetrically rotatably connected to the inner wall of the rotating housing (22). A rotating shaft (210) is rotatably connected to the inner wall of the rotating housing (22). The rotating shaft (210) passes through both sides of the rotating housing (22). A knob one (211) is fixedly connected to the side of the rotating shaft (210) away from the rotating housing (22). A knob two (212) is fixedly connected to the side of the receiving rod (27) away from the air connector (14).

3. The automatic sealing pneumatic pressure-maintaining fixture with gas leakage prevention according to claim 2, characterized in that: A gear three (213) is fixedly connected to the side of the rotating shaft (210) near the protective housing (21). A sliding rail (214) is symmetrically fixedly connected to the inner wall of the protective housing (21). A rack one (215) is slidably connected to the surface of the sliding rail (214) away from the air connector (14). A rack two (216) is slidably connected to the surface of the sliding rail (214) near the air connector (14). The surface of rack one (215) is fixedly connected to the surface of circular clamp one (217). The surface of rack two (216) is fixedly connected to the surface of circular clamp two (218). A sliding groove (219) is symmetrically opened on the inner wall of the protective housing (21) away from the rotating housing (22). The sliding groove (219) is slidably connected to the surfaces of circular clamp one (217) and circular clamp two (218).

4. The automatic sealing pneumatic pressure-maintaining fixture with gas leakage prevention according to claim 1, characterized in that: The packaging assembly (3) also includes a first packaging clamp (31), which is fixedly connected to the protective housing (21) on the side surface away from the lower punch (13). The bottom of the first packaging clamp (31) is symmetrically and linearly connected to electric telescopic rods (32). The bottom of each electric telescopic rod (32) is fixedly connected to a second packaging clamp (33). The surface of the second packaging clamp (33) is fixedly connected to a connecting shaft (35). The surface of the protective housing (21) has a first groove, and the connecting shaft (35) passes through the first groove. The surface of the air connector (14) has a second groove, and the connecting shaft (35) is slidably connected to the second groove. The end of the connecting shaft (35) away from the second packaging clamp (33) passes through the second groove and is fixedly connected to the surface of the air pressure regulating plate (37).

5. The automatic sealing pneumatic pressure-maintaining fixture with gas leakage prevention according to claim 1, characterized in that: The gas connector (14) has an external gas pipe connected to its interior.

6. The automatic sealing pneumatic pressure-maintaining fixture with gas leakage prevention according to claim 3, characterized in that: The pneumatic controller (34) electrically controls the extension and retraction of the electric telescopic rod (32).

7. The automatic sealing pneumatic pressure-maintaining fixture with gas leakage prevention according to claim 2, characterized in that: The two gears (29) mesh with each other, and both gears (29) mesh with gear (23). A protrusion is fixedly connected to the surface of the cross guide post (26), and the outer walls of the two gears (29) are fixedly connected with abutments for fixing the rotating shaft (210).

8. The automatic sealing pneumatic pressure-maintaining fixture with gas leakage prevention according to claim 4, characterized in that: The shape of the connecting shaft (35) is adapted to the shapes of groove one and groove two.

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