Silica gel tube air inflation press-fit jig

Abstract

The application provides a silica gel tube air inflation press-fitting jig, which comprises a bottom plate, a sleeve for fixing a silica gel tube, a ventilation pressure head, an adapter and a moving structure for horizontally moving the adapter; the sleeve and the moving structure are fixed on the bottom plate, and the sleeve, the ventilation pressure head and the adapter are coaxially arranged; one end of the sleeve is open and the open end faces the ventilation pressure head, and the other end is in a sealed arrangement; one end of the adapter is provided with an air channel connected with a high-pressure gas source; the ventilation pressure head is a hollow structure with both ends penetrating through; one end of the ventilation pressure head is inserted with a Teflon tube, and the other end is connected with a gas outlet end of the air channel. Through the arrangement of the sleeve, the ventilation pressure head, the adapter and the moving structure, the Teflon tube can be pressed into a deeper position in the silica gel tube during horizontal movement, air inflation press-fitting is realized, workers do not need to press-fitting with force, the labor intensity of the workers can be reduced, the problem that the workers' hands are sore or painful due to force press-fitting can be avoided, and the press-fitting efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of silica gel pipe assembly, in particular to a silica gel pipe air inflation press-fitting jig. BACKGROUND

[0002] In the manufacture of electrolytic hydrogen production device, it is necessary to sleeve the soft silica gel pipe on the hard PTFE pipe to realize the connection between different pipelines. At present, when assembling the silica gel pipe, the silica gel pipe is sleeved on the surface of the PTFE pipe by hand. Since the interference amount of the PTFE pipe and the silica gel pipe is large, the friction force is very large, and it is difficult to press the PTFE pipe into the silica gel pipe, thereby causing low press-fitting efficiency, about 50 seconds for one assembly, and large labor intensity of the operator, and the operator is prone to hand sore or hand pain. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a silica gel pipe air inflation press-fitting jig, which can improve the press-fitting efficiency and reduce the labor intensity of the workers, and avoid the problems of hand sore or hand pain of the operator caused by force pressing.

[0004] The technical scheme of the present application is as follows:

[0005] A silica gel pipe air inflation press-fitting jig, comprising a base plate, a sleeve for fixing a silica gel pipe, an air pressure head, an adapter and a moving structure for horizontally moving the adapter;

[0006] The sleeve and the moving structure are both fixed on the base plate, and the sleeve, the air pressure head and the adapter are coaxially arranged;

[0007] One end of the sleeve is open and the open end faces the air pressure head, and the other end is sealingly arranged. One end of the adapter is provided with an air passage communicating with a high-pressure gas source. The air pressure head is a hollow structure with two through ends. One end of the air pressure head is inserted into the PTFE pipe, and the other end is connected to the air outlet end of the air passage.

[0008] Preferably, the hollow cavity of the sleeve comprises a first cavity and a second cavity which are in communication with each other. The second cavity is located at the open end of the sleeve. The inner diameter of the first cavity is matched with the outer diameter of the silica gel pipe. The inner diameter of the second cavity is larger than that of the first cavity.

[0009] Preferably, the first cavity is formed with a sealing segment at one end close to the inner wall of the sealing end of the sleeve along the end of the first cavity.

[0010] Preferably, an air passage structure is arranged between the air passage and the high-pressure gas source. The air passage structure comprises a first speed regulating valve, a two-way electromagnetic valve and a first air passage pipe. The first speed regulating valve is arranged at the air inlet end of the air passage. The first speed regulating valve is communicated with the outlet of the two-way electromagnetic valve through the first air passage pipe. The inlet of the two-way electromagnetic valve is communicated with the high-pressure gas source.

[0011] Preferably, the moving structure includes a cylinder, a second speed control valve for adjusting the cylinder's movement speed, and a three-way solenoid valve for controlling the on / off state of the cylinder's power. The cylinder body is fixed to the base plate, one end of the cylinder's piston rod is fixedly connected to an adapter, and a second speed control valve is installed at each of the two interfaces on the outer wall of the cylinder. The two second speed control valves are respectively connected to the outlet of the three-way solenoid valve through a second air pipe, and the inlet of the three-way solenoid valve is connected to a high-pressure air source.

[0012] Preferably, it also includes a three-way pipe, the first end of which is connected to a high-pressure gas source, the second end of which is connected to the inlet of a two-way solenoid valve, and the third end of which is connected to the inlet of a three-way solenoid valve.

[0013] Preferably, the device also includes a switch, with a two-way solenoid valve and a three-way solenoid valve electrically connected to the switch respectively.

[0014] Preferably, the cylinder is a stroke-adjustable cylinder, and the other end of the piston rod of the cylinder is connected to an adjusting nut for adjusting the stroke of the piston rod.

[0015] Preferably, the base plate is provided with a solenoid valve mounting plate, two cylinder mounting plates and a sleeve mounting plate. The two-way solenoid valve and the three-way solenoid valve are both fixed on the solenoid valve mounting plate. The cylinder body is fixed to the base plate at both ends by the two cylinder mounting plates, and the sleeve is fixed to the base plate by the sleeve mounting plate.

[0016] A protective cover is provided on the cylinder mounting plate near the adjusting nut, covering the top of the adjusting nut.

[0017] Preferably, one side of the adapter is provided with a limiting screw to prevent the adapter from rotating.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] By setting up a sleeve, a venting head, an adapter, and a moving structure, one end of the adapter has an air passage connected to a high-pressure air source. In use, first insert the PTFE tube into the silicone tube by 2-3 mm. Then, insert the end of the PTFE tube furthest from the silicone tube into the venting head. Next, activate the moving structure to move the adapter and the venting head horizontally towards the sleeve, allowing the PTFE tube connected to the silicone tube to enter the hollow cavity of the sleeve. When the silicone tube reaches the sealed end of the sleeve, it stops moving horizontally. As the high-pressure air source continuously supplies gas into the air passage of the adapter, high pressure is created inside both the PTFE and silicone tubes, causing the silicone tube to expand. This increases the inner diameter of the silicone tube, allowing the PTFE tube to be pressed deeper into the silicone tube during horizontal movement, achieving air expansion pressing. Operators do not need to exert force during pressing, reducing labor intensity and avoiding hand soreness or pain caused by forceful pressing. Furthermore, using a fixture to assemble the silicone and PTFE tubes improves pressing efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0022] Figure 3 This is a cross-sectional view of the sleeve, venting head, and adapter in this invention;

[0023] Figure 4 This is a cross-sectional view of the sleeve in this invention;

[0024] Figure 5 This is a front view of the ventilation head in this invention.

[0025] Attached image labels:

[0026] 1-Base plate; 11-Solenoid valve mounting plate; 12-Cylinder mounting plate; 13-Sleeve mounting plate; 14-Protective cover; 15-Switch base; 2-Sleeve; 21-First cavity; 211-Sealing section; 22-Second cavity; 3-Ventilation head; 31-First end; 32-Second end; 33-Limiting plate; 34-Conical part; 4-Adapter; 41-Air passage; 5-Moving structure; 51-Cylinder; 52-Second speed control valve; 53-Three-way solenoid valve; 54-Second vent pipe; 55-Adjusting nut; 6-Ventilation structure; 61-First speed control valve; 62-Two-way solenoid valve; 63-First vent pipe; 7-Three-way pipe; 8-Limiting screw; 9-Switch; 100-Silicone tube; 200-PTFE tube. Detailed Implementation

[0027] 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 scope of protection of the present invention.

[0028] See Figures 1 to 3 A silicone tube air expansion press fixture includes a base plate 1, a sleeve 2, an air pressure head 3, an adapter 4, and a moving structure 5. The base plate 1 is used to support other components, the sleeve 2 is used to fix the silicone tube 100, the air pressure head 3 is used to fix the PTFE tube 200 and is able to allow air to pass through, the adapter 4 is used to pass the gas output from the high-pressure gas source to the air pressure head 3, and the moving structure 5 is used to move the adapter 4 horizontally.

[0029] Sleeve 2 and movable structure 5 are both fixedly mounted on base plate 1. Sleeve 2, air pressure head 3 and adapter 4 are all coaxially mounted. One end of sleeve 2 is open and faces air pressure head 3, while the other end is sealed. Since the opening of sleeve 2 faces air pressure head 3 and the end of sleeve 2 away from air pressure head 3 is sealed, and sleeve 2 is a hollow tubular structure, after silicone tube 100 enters sleeve 2, one end of silicone tube 100 abuts against the inner wall of the sealed end of sleeve 2.

[0030] One end of the adapter 4 has an air passage 41 that connects to a high-pressure air source. The air pressure head 3 is a hollow structure with both ends connected. One end of the air pressure head 3 is inserted into the PTFE tube 200, and the other end is connected to the air outlet of the air passage 41.

[0031] Working principle: First, insert the PTFE tube 200 into the silicone tube 100 by 2-3mm for easy press-fitting and positioning. Then, insert the end of the PTFE tube 200 away from the silicone tube 100 into the venting head 3. Next, activate the moving structure 5 to move the adapter 4 horizontally towards the sleeve 2. The venting head 3 moves horizontally towards the sleeve 2 along with the adapter 4, causing the silicone tube 100, which is already connected to the PTFE tube 200, to move horizontally into the hollow cavity of the sleeve 2. At the same time, the high-pressure gas source introduces gas into the gas passage 41 of the adapter 4. The gas passes through the gas passage of the adapter 4 in sequence. 41. A venting head 3, a PTFE tube 200 inserted into the venting head 3, and a silicone tube 100 connected to the PTFE tube 200. When the silicone tube 100 moves to the sealing end of the sleeve 2, the silicone tube 100 stops moving horizontally. As the high-pressure air source continuously supplies gas into the air passage 41 of the adapter 4, high pressure is formed inside the PTFE tube 200 and the silicone tube 100, causing the silicone tube 100 to expand. At this time, the inner diameter of the silicone tube 100 increases, allowing the PTFE tube 200 to be pressed deeper into the silicone tube 100 during horizontal movement. After the pressing is completed, the moving structure 5 drives the adapter 4 and the venting head 3 to move horizontally in the opposite direction. At the same time, the high-pressure air source stops supplying gas to the air passage 41. After the silicone tube 100 leaves the sleeve 2, the operator can remove the pressed silicone tube 100 and the PTFE tube 200.

[0032] After expansion, the inner diameter of the silicone tube 100 increases, and the inner wall of the silicone tube 100 separates from the outer wall of the PTFE tube 200, greatly reducing friction. This allows the PTFE tube 200 to be easily pressed deeper into the silicone tube 100 during horizontal movement, achieving air expansion pressing. Operators do not need to exert force during pressing, which reduces labor intensity and avoids hand soreness or pain caused by forceful pressing. Furthermore, using a jig to assemble the silicone tube 100 and the PTFE tube 200 improves pressing efficiency.

[0033] It should be noted that, in order to avoid the PTFE tube 200 not aligning with the silicone tube 100 during press-fitting, the PTFE tube 200 should first be inserted into the silicone tube 100 by 2-3 mm. In this step, the depth of the PTFE tube 200 inserted into the silicone tube 100 is small, and no force is required for press-fitting; it can be done manually. When the silicone tube 100 moves to the sealing end of the sleeve 2, the gas introduced by the high-pressure gas source passes sequentially through the gas passage 41 of the adapter 4, the air pressure head 3, the PTFE tube 200 inserted into the air pressure head 3, and the silicone tube 100 connected to the PTFE tube 200.

[0034] Gas enters the hollow cavity of silicone tube 100 through the hollow cavity of PTFE tube 200. When silicone tube 100 moves to the sealing end of sleeve 2, high pressure is generated inside PTFE tube 200 and silicone tube 100, causing silicone tube 100 to expand. The inner wall of silicone tube 100 separates from the outer wall of PTFE tube 200, and some gas will be discharged from the gap between the inner wall of silicone tube 100 and the outer wall of PTFE tube 200. This avoids excessive high pressure resistance that prevents PTFE tube 200 from moving horizontally. Under the action of moving structure 5, PTFE tube 200 can be easily pressed into a deeper position inside silicone tube 100.

[0035] See Figure 5 The venting head 3 includes a first end 31 that is inserted into the PTFE tube 200 and a second end 32 that is connected to the air passage 41. The middle part of the venting head 3 extends to form a limiting plate 33. The limiting plate 33 can be used to position the insertion depth of the PTFE tube 200. The second end 32 can be connected to the air passage 41 by a threaded connection. Furthermore, a tapered part 34 is provided at the connection position between the first end 31 and the limiting plate 33. The tapered part 34 and the PTFE tube 200 are interference-fitted to achieve a sealed connection between the PTFE tube 200 and the venting head 3, so as to avoid gas leakage affecting the pressing effect.

[0036] Preferred, see Figure 3 and Figure 4The hollow cavity of sleeve 2 includes a first cavity 21 and a second cavity 22 that are interconnected. The second cavity 22 is located at the open end of sleeve 2. The inner diameter of the first cavity 21 is adapted to the outer diameter of the silicone tube 100, and the inner diameter of the second cavity 22 is larger than the inner diameter of the first cavity 21. Since the inner diameter of the second cavity 22 is larger than the inner diameter of the first cavity 21, and the inner diameter of the first cavity 21 is adapted to the outer diameter of the silicone tube 100, that is, the inner diameter of the second cavity 22 is larger than the outer diameter of the silicone tube 100, the second cavity 22 provides expansion space for the silicone tube 100. When high pressure is formed inside the PTFE tube 200 and the silicone tube 100, the part of the silicone tube 100 located in the second cavity 22 expands more. The part of the silicone tube 100 located in the second cavity 22 is the part that can be pressed into the PTFE tube 200, and the PTFE tube 200 can be easily pressed in. Depending on the different pressing depths of the PTFE tube 200, the second cavity 22 can be set to different horizontal lengths, and the sleeve 2 can be fixed to the base plate 1 with a detachable structure to accommodate different pressing requirements. Specifically, the inner diameter of the first cavity 21 inside the sleeve 2 is designed according to the outer diameter of the silicone tube 100, and the inner diameter of the second cavity 22 is designed according to the expansion requirements of the silicone tube 100.

[0037] Furthermore, a sealing section 211 is formed along the end of the first cavity 21 near the inner wall of the sealing end of the sleeve 2. That is, the sealing section 211 is located on the opposite side of the opening at one end of the sleeve 2.

[0038] Due to tolerances in the silicone tube 100, such as variations in its outer diameter and uneven end face cuts, the sealing effect between the silicone tube 100 and the sleeve 2 may be poor. The sealing section 211 addresses this issue. When one end of the silicone tube 100 moves to the inner wall of the sealing end of the sleeve 2, the air intake velocity of the high-pressure air source exceeds the leakage velocity. This causes the portion of the silicone tube 100 located in the sealing section 211 to expand, tightly adhering the outer wall of one end of the silicone tube 100 to the inner wall of the sealing section 211. This ensures a tight seal between the silicone tube 100 and the sleeve 2, preventing any impact on the air expansion and pressing effect. In actual use, the horizontal length of the sealing section 211 is typically set to 2–3 mm.

[0039] Specifically, a ventilation structure 6 is provided between the air passage 41 and the high-pressure gas source. The function of the ventilation structure 6 is to pass the gas from the high-pressure gas source to the air passage 41 of the adapter 4. The ventilation structure 6 includes a first speed regulating valve 61, a two-way solenoid valve 62, and a first ventilation pipe 63. The first speed regulating valve 61 is located at the air inlet end of the air passage 41. The first speed regulating valve 61 is connected to the outlet of the two-way solenoid valve 62 through the first ventilation pipe 63. The inlet of the two-way solenoid valve 62 is connected to the high-pressure gas source. The first speed regulating valve 61 is used to adjust the gas flow rate into the air passage 41, the two-way solenoid valve 62 is used to control the gas flow, and the first ventilation pipe 63 connects the two-way solenoid valve 62 and the first speed regulating valve 61. By adjusting the gas flow rate into the air passage 41 using the first speed regulating valve 61, the amount of gas introduced is controlled, thereby controlling the gas expansion pressure. The gas flow is controlled by using the two-way solenoid valve 62. Generally, gas is introduced only after the PTFE tube 200 is inserted into the silicone tube 100 by 2-3 mm and the PTFE tube 200 is inserted into the gas pressure head 3. This avoids the waste of gas and electricity caused by continuous gas supply to the gas supply structure 6. Moreover, after the gas is pressed into place, the gas supply to the air passage 41 can be stopped by the action of the two-way solenoid valve 62.

[0040] Specifically, the moving structure 5 includes a cylinder 51, a second speed regulating valve 52, and a three-way solenoid valve 53. The second speed regulating valve 52 is used to adjust the movement speed of the cylinder 51, and the three-way solenoid valve 53 is used to control the power supply to the cylinder 51. The cylinder body of the cylinder 51 is fixed on the base plate 1, and one end of the piston rod of the cylinder 51 is fixedly connected to the adapter 4. Two ports on the outer wall of the cylinder 51 are respectively equipped with a second speed regulating valve 52. The two second speed regulating valves 52 are respectively connected to the outlet of the three-way solenoid valve 53 through a second air pipe 54, and the inlet of the three-way solenoid valve 53 is connected to a high-pressure air source. Under the action of the three-way solenoid valve 53 and the second speed regulating valve 52, the high-pressure air source supplies air to the cylinder body of the cylinder 51 to realize the extension and retraction of the piston rod. When the piston rod extends and retracts, it drives the adapter 4 to move horizontally.

[0041] Preferably, the fixture also includes a three-way pipe 7. The first end of the three-way pipe 7 is connected to a high-pressure air source, the second end is connected to the inlet of the two-way solenoid valve 62, and the third end is connected to the inlet of the three-way solenoid valve 53. That is, the two-way solenoid valve 62 and the three-way solenoid valve 53 are arranged in parallel. By setting the three-way pipe 7, the same high-pressure air source is used to supply air to the two-way solenoid valve 62 and the three-way solenoid valve 53, avoiding the need to set two separate high-pressure air sources, making the overall structure of the fixture more compact.

[0042] Preferably, the system also includes a switch 9, with a two-way solenoid valve 62 and a three-way solenoid valve 53 electrically connected to the switch 9. The switch 9 controls the operation of the two-way solenoid valve 62 and the three-way solenoid valve 53. For clarity, the interface on the cylinder block closer to the adapter 4 is defined as interface a, and the interface farther from the adapter 4 is defined as interface b. After the PTFE tube 200 is inserted 2-3 mm into the silicone tube 100 and the PTFE tube 200 is inserted into the air pressure head 3, pressing the switch 9 opens the outlet of the two-way solenoid valve 62 and opens the outlet connected to interface b while closing the outlet connected to interface a, thus supplying air to the air passage 41 and interface b respectively, thereby expanding the silicone tube 100 and pressing the PTFE tube 200 into place. The switch 9 is a reset switch. After the tube is pressed into place, the reset switch automatically controls the two-way solenoid valve 62 to close its outlet and simultaneously controls the three-way solenoid valve 53 to open the outlet connected to interface a and close the outlet connected to interface b, supplying air to interface a and resetting the moving structure 5.

[0043] Preferably, cylinder 51 is a stroke-adjustable cylinder, and the other end of the piston rod of cylinder 51 is connected to an adjusting nut 55 for adjusting the piston rod stroke. By adjusting the adjusting nut 55, the stroke of the cylinder can be changed, thereby adjusting the insertion depth of the PTFE tube 200.

[0044] Preferably, the base plate 1 is provided with a solenoid valve mounting plate 11, two cylinder mounting plates 12, and a sleeve mounting plate 13, which are used to install a two-way solenoid valve 62 and a three-way solenoid valve, a cylinder 51, and a sleeve 2, respectively. The two-way solenoid valve 62 and the three-way solenoid valve are both fixed on the solenoid valve mounting plate 11. The two ends of the cylinder body of the cylinder 51 are fixed to the base plate 1 by the two cylinder mounting plates 12, and the sleeve 2 is fixed to the base plate 1 by the sleeve mounting plate 13. Furthermore, the base plate 1 is provided with a switch seat 15, and the switch 9 is mounted on the switch seat 15; a protective cover 14 is provided on the cylinder mounting plate 12 near the adjusting nut 55, and the protective cover 14 covers the adjusting nut 55. When the piston rod of cylinder 51 extends or retracts, the adjusting nut 55 will approach the cylinder body of cylinder 5. If a worker's hand is placed between the cylinder body and the adjusting nut 55 at this time, he / she will be pinched. The protective cover 14 can cover the adjusting nut 55 to prevent the worker's hand from contacting the position between the cylinder body and the adjusting nut 55, thereby preventing injury.

[0045] Preferred, see Figure 1 One side of the adapter 4 is provided with a limiting screw 8 to prevent the adapter 4 from rotating. Specifically, the nut of the limiting screw 8 is set at a position higher than the adapter 4. The adapter 4 has at least one plane that is close to the bolt of the screw 8. Due to the presence of the nut of the limiting screw 8 and the plane of the adapter 4, the nut can limit the rotation of the adapter 4.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A silicone tube air-expansion press fixture, characterized in that, It includes a base plate (1), a sleeve (2) for fixing the silicone tube, an air pressure head (3), an adapter (4), and a moving structure (5) for horizontally moving the adapter (4). The sleeve (2) and the moving structure (5) are both fixed on the base plate (1), and the sleeve (2), the air pressure head (3) and the adapter (4) are all coaxially arranged; One end of the sleeve (2) is open and faces the venting head (3), and the other end is sealed. One end of the adapter (4) has a gas channel (41) connected to a high-pressure gas source. The venting head (3) is a hollow structure with both ends connected. One end of the venting head (3) is inserted into a PTFE tube, and the other end is connected to the outlet end of the gas channel (41), so that the gas can enter the hollow cavity of the silicone tube through the hollow cavity of the PTFE tube. The hollow cavity of the sleeve (2) includes a first cavity (21) and a second cavity (22) that are interconnected. The second cavity (22) is located at the open end of the sleeve (2). The inner diameter of the first cavity (21) is adapted to the outer diameter of the silicone tube. The inner diameter of the second cavity (22) is larger than the inner diameter of the first cavity (21). The first cavity (21) has a sealing section (211) formed at one end near the inner wall of the sealing end of the sleeve (2) along the end of the first cavity (21), and the horizontal length of the sealing section (211) is 2 to 3 mm.

2. The silicone tube air expansion press fixture according to claim 1, characterized in that, A ventilation structure (6) is provided between the air passage (41) and the high-pressure air source. The ventilation structure (6) includes a first speed regulating valve (61), a two-way solenoid valve (62) and a first ventilation pipe (63). The first speed regulating valve (61) is located at the air inlet end of the air passage (41). The first speed regulating valve (61) is connected to the outlet of the two-way solenoid valve (62) through the first ventilation pipe (63). The inlet of the two-way solenoid valve (62) is connected to the high-pressure air source.

3. The silicone tube air expansion press fixture according to claim 2, characterized in that, The moving structure (5) includes a cylinder (51), a second speed regulating valve (52) for adjusting the movement speed of the cylinder (51), and a three-way solenoid valve (53) for controlling the power on / off of the cylinder (51). The cylinder body of the cylinder (51) is fixed on the base plate (1). One end of the piston rod of the cylinder (51) is fixedly connected to the adapter (4). Two interfaces on the outer wall of the cylinder (51) are respectively equipped with a second speed regulating valve (52). The two second speed regulating valves (52) are respectively connected to the outlet of the three-way solenoid valve (53) through a second air pipe (54). The inlet of the three-way solenoid valve (53) is connected to a high-pressure air source.

4. The silicone tube air expansion press fixture according to claim 3, characterized in that, It also includes a three-way pipe (7), the first end of which is connected to the high-pressure gas source, the second end of which is connected to the inlet of the two-way solenoid valve (62), and the third end of which is connected to the inlet of the three-way solenoid valve (53).

5. The silicone tube air expansion press fixture according to claim 3 or 4, characterized in that, It also includes a switch (9), and the two-way solenoid valve (62) and the three-way solenoid valve (53) are electrically connected to the switch (9) respectively.

6. The silicone tube air expansion press fixture according to claim 3 or 4, characterized in that, The cylinder (51) is a stroke adjustable cylinder, and the other end of the piston rod of the cylinder (51) is connected to an adjusting nut (55) for adjusting the stroke of the piston rod.

7. The silicone tube air expansion press fixture according to claim 6, characterized in that, The base plate (1) is provided with a solenoid valve mounting plate (11), two cylinder mounting plates (12) and a sleeve mounting plate (13). The two-way solenoid valve (62) and the three-way solenoid valve are both fixed on the solenoid valve mounting plate (11). The cylinder body of the cylinder (51) is fixed on the base plate (1) by the two cylinder mounting plates (12). The sleeve (2) is fixed on the base plate (1) by the sleeve mounting plate (13). A protective cover (14) is provided on the cylinder mounting plate (12) near the adjusting nut (55), and the protective cover (14) covers the adjusting nut (55).

8. The silicone tube air expansion press fixture according to any one of claims 1 to 4, characterized in that, One side of the adapter (4) is provided with a limiting screw (8) to prevent the adapter (4) from rotating.

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