Pipe fitting pressure test clamp

Abstract

The utility model relates to the technical field of pipe fitting test auxiliary tools, in particular to a pipe fitting pressure test clamp which comprises a clamping outer cylinder arranged at the end of a pipe fitting in a sleeving mode and a clamping end cover arranged on the peripheral wall of the pipe fitting in a sleeving mode and used for locking the pipe fitting to the clamping outer cylinder. An accommodating cavity for inserting a pipe fitting and a ventilation cavity for introducing inert gas are formed in the clamping outer cylinder, the accommodating cavity is communicated with the ventilation cavity, and the clamping end cover is coaxially mounted at one end of the clamping outer cylinder; a ventilation pipe communicating with the ventilation cavity is arranged on the outer wall of the end, away from the clamping end cover, of the clamping outer cylinder in a penetrating mode. The problem that the sealing effect between the pipe fitting and the gas supply system is affected due to repeated use of the clamping sleeve is solved, and the accuracy of the pipe fitting gas tightness test is improved.

Description

Technical Field

[0001] The present application relates to the technical field of pipe fitting testing auxiliary tools, and particularly to a pipe fitting pressure testing fixture. Background Art

[0002] During the production and manufacturing process of ultra-long stainless steel precision rolling pipes, airtightness testing is usually carried out to detect whether there are leaks in the pipe fittings and ensure the integrity of the pipe fittings. In airtightness testing, inert gases with stable chemical properties such as nitrogen or argon need to be selected to prevent the gas from reacting with the inner wall of the pipe fitting. First, one end of the pipe fitting to be tested is closed, and the other end is connected to the gas supply system. The inert gas is injected into the pipe through a pressure pump or compressor, and the pressure in the pipe is gradually increased to a predetermined test pressure value. The gas supply is closed, and the pressure in the pipe is maintained for several minutes to confirm that the pressure is in a stable state. The pipe fitting is placed in a water tank, and it is observed whether there are bubbles around the pipe fitting. If there are no bubbles, it is considered that the integrity of the pipe fitting is good. If there are bubbles, the point where the bubbles are generated is the leakage point of the pipe fitting.

[0003] In the related art, usually a ferrule is used to fix the pipe fitting to the connector of the gas supply system, and then a nut is tightened. The ferrule connection relies on physical clamping force rather than chemical fusion, and is easy to install without welding, and is more suitable for systems that need to be disassembled frequently.

[0004] In view of the above related art, the disassembly and assembly of the ferrule need to be assisted by a ferrule pliers. The ferrule can provide good sealing during the initial installation, but after several disassembly and assembly operations, the contact surface between the ferrule and the pipe fitting will be damaged, affecting the sealing effect. Utility Model Content

[0005] In order to improve the problem that the repeated use of the ferrule affects the sealing effect between the pipe fitting and the gas supply system and improve the accuracy of the airtightness test of the pipe fitting, the present application provides a pipe fitting pressure testing fixture.

[0006] The pipe fitting pressure testing fixture provided by the present application adopts the following technical solutions:

[0007] A pipe fitting pressure testing fixture includes a clamping outer cylinder sleeved on the end of the pipe fitting and a clamping end cover sleeved on the outer peripheral wall of the pipe fitting and used to lock the pipe fitting to the clamping outer cylinder. The inside of the clamping outer cylinder has a receiving cavity for the pipe fitting to be inserted and a ventilation cavity for the inert gas to pass through. The receiving cavity is communicated with the ventilation cavity. The clamping end cover is coaxially installed and threadedly connected to one end of the clamping outer cylinder;

[0008] A ventilation pipe communicating with the ventilation cavity is penetrated through the outer wall of the clamping outer cylinder at the end far from the clamping end cover.

[0009] By adopting the above technical solution, compared with the method of using a ferrule pliers for auxiliary disassembly and assembly, the threaded fit between the clamping outer cylinder and the clamping end cover tightly locks the pipe fitting. With a simple and quick locking and releasing mechanism, it reduces the damage to the contact surface caused by repeated disassembly and assembly, ensures the sealing performance for long-term use, enables a stable and reliable sealing effect to be obtained in each test, and improves the accuracy of the test. The fixture does not rely on permanent connection methods such as welding, is applicable to test systems that require frequent disassembly and assembly or replacement of pipe fittings, and improves the versatility and practicality of the fixture.

[0010] Further, it further includes a first inner cylinder installed inside the clamping outer cylinder and abutted against the inner wall of the clamping outer cylinder, and a second inner cylinder abutted against the inner wall of the first inner cylinder and cooperating with the clamping end cover;

[0011] On the inner peripheral wall of the clamping outer cylinder, a first step for clamping the pipe fitting is provided on one side close to the ventilation cavity, and a second step for clamping the first inner cylinder is provided at the middle position of the container cavity;

[0012] On the inner wall of the first inner cylinder, a limiting step for the second inner cylinder to abut against is provided on one side close to the ventilation pipe.

[0013] By adopting the above technical solution, the first inner cylinder and the second inner cylinder form a double-layer sealing structure between the pipe fitting and the clamping outer cylinder. While improving the reliability of the seal, it also compensates for the slight deformation caused by thermal expansion and contraction of the material to a certain extent and maintains the sealing effect. The first step and the second step provided inside the clamping outer cylinder are respectively used to clamp the pipe fitting and the first inner cylinder, realizing the precise positioning and fixation of the pipe fitting and the internal components, ensuring the stability of each component during the test, and avoiding seal failure caused by loosening or misalignment.

[0014] Further, the clamping end cover has a threaded ring cover for threaded connection with the clamping outer cylinder and a conical chuck for clamping the pipe fitting. The conical chuck is coaxially arranged with the threaded ring cover and integrally connected;

[0015] The inner wall of the second inner cylinder has a conical abutting surface cooperating with the conical chuck.

[0016] By adopting the above technical solution, the threaded connection between the threaded ring cover and the clamping outer cylinder realizes the tight locking between the clamping end cover and the clamping outer cylinder, which not only provides reliable sealing performance but also withstands greater pressure during the test, preventing loosening or leakage caused by gas pressure. The cooperation between the conical chuck and the conical abutting surface on the inner wall of the second inner cylinder forms a more tightly sealed structure. Under the action of the conical abutting surface, the conical chuck gradually tightens during the process of clamping the pipe fitting, realizing a more uniform and stable clamping effect, reducing the risk of deformation or damage to the pipe fitting caused by uneven clamping, and improving the accuracy of the test.

[0017] Furthermore, the conical chuck is provided with a plurality of strip grooves for deformation at intervals in the circumferential direction.

[0018] By adopting the above technical solution, the conical chuck cooperates with the conical abutment surface and gradually tightens during the process of clamping the pipe. The opening of the strip groove allows the conical chuck to deform to a certain extent when clamping the pipe, thereby improving the degree to which the conical chuck can be tightened, improving the adaptability of the clamp to the pipe and the clamping stability. During the clamping process, stress concentration is prone to occur in the contact area between the pipe and the chuck. The strip groove helps to disperse this stress and reduce the stress concentration phenomenon, thereby protecting the pipe and the chuck and avoiding damage to the pipe or the chuck.

[0019] Furthermore, a sealing gasket is provided on the top side of the limiting step, and the lower side of the second inner tube abuts against the limiting step through the sealing gasket.

[0020] By adopting the above technical solution, the sealing gasket provides an additional sealing layer for the contact surface between the second inner cylinder and the limiting step, preventing gas from leaking through the tiny gap of the contact surface during the high-pressure test, thereby improving the sealing performance of the entire fixture. The sealing gasket not only plays a sealing role, but also can enhance the connection stability between the second inner cylinder and the limiting step to a certain extent, help to disperse the stress caused by gas pressure, and prevent damage or loosening of components due to stress concentration.

[0021] Furthermore, an annular groove is formed on the outer peripheral wall of the second inner cylinder, a sealing rubber ring is embedded in the annular groove, and the outer peripheral wall of the sealing rubber ring is pressed tightly against the inner wall of the clamping outer cylinder.

[0022] By adopting the above technical solution, the sealing rubber ring provides a sealing layer for the connection between the second inner cylinder and the clamping outer cylinder, enhances the sealing performance of the fixture, and effectively prevents gas leakage under high-pressure test environment. The sealing rubber ring has good elasticity and sealing performance, and can fit tightly on the contact surface between the second inner cylinder and the clamping outer cylinder, reducing the risk of leakage, enhancing the structural sealing of the entire fixture, and making it more stable and reliable.

[0023] Furthermore, the outer circumferential wall of the second inner cylinder is provided with a convex step on a side away from the first inner cylinder, and the outer circumferential wall of the first inner cylinder is provided with a concave step on a side close to the convex step;

[0024] A spring is sleeved on the outside of the second inner cylinder, and two ends of the spring are respectively abutted between two opposite side surfaces of the concave step and the convex step.

[0025] By adopting the above technical solution, the spring enables the second inner cylinder to pop out of the clamping outer cylinder under the action of an external force during disassembly, facilitating the removal of the second inner cylinder, simplifying the operation process, and ensuring that the fixture can still maintain a stable clamping effect after multiple uses. The elastic force of the spring enables the second inner cylinder to generate a certain pre-tightening force when clamping the pipe fitting, helping to reduce the clamping looseness caused by the vibration or pressure fluctuation of the pipe fitting. During the test process, the pipe fitting may be impacted by gas pressure or other external factors, and the buffering and shock-absorbing effect of the spring can absorb these impact energies, protecting the pipe fitting and the fixture from damage.

[0026] Further, it also includes positioning bolts for fixing the relative positions of the clamping outer cylinder, the first inner cylinder, and the second inner cylinder. A round hole for the positioning bolt to pass through is provided on the side wall of the clamping outer cylinder away from the ventilation pipe, a first kidney-shaped hole for the positioning bolt to pass through is provided on the side wall of the first inner cylinder, and a second kidney-shaped hole for the positioning bolt to pass through is provided on the side wall of the second inner cylinder.

[0027] By adopting the above technical solution, the positioning bolts sequentially pass through the round hole and the kidney-shaped holes opened on the clamping outer cylinder, the first inner cylinder, and the second inner cylinder, tightly connecting the three components, playing a pre-fixing role before the clamping end cover is screwed onto the clamping outer cylinder, enhancing the overall structural stability of the fixture, and preventing performance degradation caused by component loosening or misalignment during use. The first kidney-shaped hole and the second kidney-shaped hole can be finely adjusted within a certain range to realize the adjustment of the relative positions of the clamping outer cylinder, the first inner cylinder, and the second inner cylinder. Precise adjustment of the relative positions of the clamping outer cylinder, the first inner cylinder, and the second inner cylinder can ensure that the sealing rubber ring or sealing washer can fit more tightly under pressure, thereby improving the sealing performance, helping to reduce the risk of gas leakage, and improving the accuracy of the test.

[0028] Further, the ventilation pipe vertically penetrates the clamping outer cylinder and is detachably connected to the clamping outer cylinder.

[0029] By adopting the above technical solution, the detachable connection between the ventilation pipe and the clamping outer cylinder facilitates the operator to replace ventilation pipes of different specifications or materials according to actual test requirements, expanding the applicable range of the fixture and enabling it to adapt to more types of pipe fitting tests. At the same time, the detachable connection also facilitates the cleaning and maintenance of the ventilation pipe and the connection between the clamping outer cylinder and the ventilation pipe, keeping the ventilation pipe unobstructed and preventing the accuracy of the test results from being affected due to blockage or contamination.

[0030] Further, a handle is hinged on the side wall of the clamping end cover.

[0031] By adopting the above technical solution, the hinged handle facilitates the operator to apply force when rotating the clamping end cover. Whether it is during installation, disassembly, or adjustment of the clamping end cover, it can be completed by holding and rotating the handle, preventing difficult rotation due to slippage between the hand and the clamping end cover, and improving work efficiency. The hinged handle can be folded to one side of the clamping end cover when not in use, saving space and making the fixture more compact during storage and transportation.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. Through the sealing structure of the first inner cylinder and the second inner cylinder and the use of the sealing gasket and the sealing rubber ring, the sealing performance of the fixture is improved, preventing gas leakage during high-pressure testing. The conical chuck cooperates with the conical abutting surface and gradually tightens when clamping the pipe fitting, enabling more uniform and stable clamping of the pipe fitting, reducing the risk of deformation or damage to the pipe fitting caused by uneven clamping, and effectively ensuring the accuracy of the test;

[0034] 2. The positioning bolts enhance the connection stability between the clamping outer cylinder, the first inner cylinder, and the second inner cylinder, preventing component loosening or misalignment, and ensuring the overall structural stability of the fixture during the test. The first waist-shaped hole and the second waist-shaped hole provide a fine-tuning function, allowing precise adjustment of the relative positions of the clamping outer cylinder, the first inner cylinder, and the second inner cylinder;

[0035] 3. The detachable connection between the vent pipe and the clamping outer cylinder facilitates the replacement and cleaning of the vent pipe, improving the applicability of the fixture. The hinged handle enables the operator to easily, quickly install, disassemble, and adjust the clamping end cover, improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of the overall structure of a pipe fitting pressure test fixture according to an embodiment of the present application.

[0037] Figure 2 is an exploded schematic diagram of the structure of a pipe fitting pressure test fixture according to an embodiment of the present application.

[0038] Figure 3 is a schematic diagram of the sectional structure of a pipe fitting pressure test fixture according to an embodiment of the present application.

[0039] Figure 4 is Figure 3 an enlarged schematic diagram of the structure of the sealing gasket and the sealing rubber ring in part A in

[0040] Figure 5 is Figure 3 an enlarged schematic diagram of the structure of the round hole, the first waist-shaped hole, the second waist-shaped hole, and the positioning bolt in part B in

[0041] Description of reference numerals: 1. Clamping outer cylinder; 11. Accommodating cavity; 12. Ventilation cavity; 13. First step; 14. Second step; 15. Ring groove; 151. Sealing rubber ring; 16. Round hole; 2. First inner cylinder; 21. Limiting step; 211. Sealing washer; 22. Concave step; 23. First kidney-shaped hole; 3. Second inner cylinder; 31. Conical abutting surface; 32. Strip-shaped groove; 33. Convex step; 34. Spring; 35. Second kidney-shaped hole; 4. Clamping end cover; 41. Conical chuck; 42. Threaded ring cover; 5. Positioning bolt; 6. Vent pipe; 7. Handle. Detailed implementation manners

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the following further describes the present application in detail with reference to the Figures 1-5 accompanying drawings and embodiments.

[0043] An embodiment of the present application discloses a pipe fitting pressure test fixture. Referring to Figure 1 and Figure 2 , the pipe fitting pressure test fixture includes a clamping outer cylinder 1, a first inner cylinder 2, a second inner cylinder 3, a clamping end cover 4, a positioning bolt 5 and a vent pipe 6. The first inner cylinder 2 and the second inner cylinder 3 are both installed inside the clamping outer cylinder 1, and the clamping end cover 4 is threadedly connected to one end of the clamping outer cylinder 1. The vent pipe 6 vertically penetrates and is threadedly connected to the outer wall of the clamping outer cylinder 1 on the side far from the clamping end cover 4. A handle 7 is hinged on the outer side wall of the clamping end cover 4, and an operator can hold and rotate the handle 7 to install / dismount the clamping end cover 4 on / from the clamping outer cylinder 1.

[0044] Referring to Figure 1 and Figure 3 , the inside of the clamping outer cylinder 1 has an accommodating cavity 11 and a ventilation cavity 12 which are coaxially opened and communicate with each other. The accommodating cavity 11 is for the pipe fitting, and the ventilation cavity 12 is for the inert gas to be introduced. The ventilation cavity 12 and the vent pipe 6 are perpendicular and communicate with each other. A first step 13 for clamping the pipe fitting is provided on the inner peripheral wall of the clamping outer cylinder 1 near one end of the vent pipe 6, and a second step 14 for clamping the first inner cylinder 2 is provided at the middle position of the accommodating cavity 11 on the inner peripheral wall of the clamping outer cylinder 1.

[0045] The first inner cylinder 2 is installed inside the clamping outer cylinder 1, and the outer wall of the first inner cylinder 2 abuts against the inner wall of the clamping outer cylinder 1. Combining Figure 4 , a ring groove 15 is formed on the outer peripheral wall of the first inner cylinder 2 near one side of the second step 14, and a sealing rubber ring 151 for tightly abutting against the inner wall of the clamping outer cylinder 1 is embedded in the ring groove 15. The second inner cylinder 3 is installed inside the first inner cylinder 2, and a limiting step 21 for the second inner cylinder 3 to abut against the lower side is provided on the inner wall of the first inner cylinder 2 near one side of the vent pipe 6. A sealing washer 211 is provided on the top side of the limiting step 21, and the lower side of the second inner cylinder 3 abuts against the limiting step 21 through the sealing washer 211.

[0046] Referring to Figure 2 and Figure 3 , the clamping end cap 4 has a conical chuck 41 and a threaded ring cover 42 that are coaxially arranged and integrally connected. The threaded ring cover 42 is used for threaded connection with the outer wall of the clamping outer cylinder 1, and the conical chuck 41 is used for clamping the outer wall of the pipe fitting. The inner wall of the second inner cylinder 3 has a conical abutting surface 31 that cooperates with the conical chuck 41, and a plurality of strip-shaped grooves 32 for deformation are circumferentially spaced on the conical chuck 41.

[0047] A convex step 33 is provided on the outer peripheral wall of the second inner cylinder 3, and the convex step 33 is located on the side of the second inner cylinder 3 close to the clamping end cap 4. A concave step 22 is provided on the outer peripheral wall of the first inner cylinder 2, and the concave step 22 is located on the side of the first inner cylinder 2 away from the sealing rubber ring 151. A spring 34 is sleeved outside the second inner cylinder 3, and both ends of the spring 34 respectively abut between the opposite side surfaces of the concave step 22 and the convex step 33. When the second inner cylinder 3 is installed into the first inner cylinder 2, the upper side of the second inner cylinder 3 is flush with the upper side of the clamping outer cylinder 1, and the convex step 33 of the second inner cylinder 3 abuts against the inner wall of the clamping outer cylinder 1. When the second inner cylinder 3 needs to be disassembled, the spring 34 ejects the second inner cylinder 3 out of the clamping outer cylinder 1 through the elastic action on the convex step 33, facilitating the disassembly of the second inner cylinder 3 and other components.

[0048] Referring to Figure 2 and Figure 5 , a circular hole 16 through which a positioning bolt 5 vertically passes is provided on the side wall of the clamping outer cylinder 1. A first kidney-shaped hole 23 is provided at the middle position on the side wall of the first inner cylinder 2, and a second kidney-shaped hole 35 is provided at a position on the side wall of the second inner cylinder 3 close to the limit step 21. The positioning bolt 5 sequentially passes through the clamping outer cylinder 1 of the clamping outer cylinder 1, the first kidney-shaped hole 23 of the first inner cylinder 2, and the second kidney-shaped hole 35 of the second inner cylinder 3, thereby fixing the relative installation positions of the clamping outer cylinder 1, the first inner cylinder 2, and the second inner cylinder 3.

[0049] The implementation principle of a pipe fitting pressure test fixture in an embodiment of the present application is as follows: An accommodation cavity 11 and a ventilation cavity 12 are provided inside the clamping outer cylinder 1, which are respectively used for accommodating the pipe fitting and introducing inert gas. The first inner cylinder 2 and the second inner cylinder 3 are sequentially installed inside the clamping outer cylinder 1. The first step 13 and the second step 14 respectively clamp the pipe fitting and the first inner cylinder 2 to achieve preliminary positioning. The sealing rubber ring 151 is embedded in the ring groove 15 of the first inner cylinder 2 and tightly abuts against the inner wall of the clamping outer cylinder 1 to form the first layer of seal. The sealing washer 211 is placed on the top side of the limit step 21, and the second inner cylinder 3 abuts against the limit step 21 through the sealing washer 211 to form the second layer of seal. The positioning bolt 5 passes through the holes on the clamping outer cylinder 1, the first inner cylinder 2, and the second inner cylinder 3 to finely adjust and fix the relative positions of the three, enhancing the structural stability.

[0050] The clamping end cap 4 is connected to one end of the clamping outer cylinder 1 by means of a threaded connection. The conical chuck 41 thereon cooperates with the conical abutting surface 31 on the inner wall of the second inner cylinder 3 to clamp the pipe fitting. The strip-shaped groove 32 on the conical chuck 41 allows it to deform during the clamping process, achieving a tighter clamping effect while reducing stress concentration, protecting the pipe fitting and the chuck. The spring 34 sleeved outside the second inner cylinder 3 provides elastic force during disassembly, pushing the second inner cylinder 3 out of the clamping outer cylinder 1 for easy and quick disassembly.

[0051] The vent pipe 6 vertically penetrates and is threadedly connected to the outer wall of the clamping outer cylinder 1, communicating with the ventilation cavity 12, and is used for introducing inert gas. The inert gas enters the interior of the pipe fitting through the ventilation cavity 12 for airtightness testing. The use of the double-layer sealing structure and the sealing rubber ring 151 and the sealing washer 211 ensures that gas does not leak during the testing process, improving the testing accuracy. The handle 7 hinged on the outer side wall of the clamping end cap 4 is convenient for the operator to hold and rotate, realizing the quick installation and disassembly of the clamping end cap 4.

[0052] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A pipe pressure test fixture, characterized in that: The invention comprises a clamping outer cylinder (1) sleeved on the end of a pipe fitting and a clamping end cover (4) sleeved on the outer peripheral wall of the pipe fitting and used to lock the pipe fitting on the clamping outer cylinder (1); the interior of the clamping outer cylinder (1) comprises a receiving cavity (11) for inserting the pipe fitting and a venting cavity (12) for letting in an inert gas; the receiving cavity (11) and the venting cavity (12) are communicated with each other; the clamping end cover (4) is coaxially mounted and threadedly connected to one end of the clamping outer cylinder (1); A ventilation pipe (6) communicating with the ventilation cavity (12) is provided on the outer wall of the clamping outer cylinder (1) at one end away from the clamping end cover (4).

2. A pipe pressure test fixture according to claim 1, characterized in that: It also includes a first inner cylinder (2) installed in the clamping outer cylinder (1) and abutting against the inner wall of the clamping outer cylinder (1), and a second inner cylinder (3) abutting against the inner wall of the first inner cylinder (2) and matching with the clamping end cover (4); The inner circumferential wall of the clamping outer cylinder (1) is provided with a first step (13) for clamping the pipe at a side close to the ventilation cavity (12), and the inner circumferential wall of the clamping outer cylinder (1) is provided with a second step (14) for clamping the first inner cylinder (2) at a middle position of the accommodating cavity (11); The inner wall of the first inner cylinder (2) is provided with a limiting step (21) on a side close to the ventilation pipe (6) for the second inner cylinder (3) to abut against.

3. A pipe pressure test fixture according to claim 2, characterized in that: The clamping end cover (4) comprises a threaded ring cover (42) for threaded connection with the clamping outer tube (1) and a conical chuck (41) for clamping the pipe fitting, wherein the conical chuck (41) and the threaded ring cover (42) are coaxially arranged and integrally connected; The inner wall of the second inner cylinder (3) has a conical abutment surface (31) that matches the conical chuck (41).

4. A pipe pressure test fixture according to claim 3, characterized in that: The conical chuck (41) is provided with a plurality of strip grooves (32) spaced apart in the circumferential direction for deformation.

5. A pipe pressure test fixture according to claim 2, characterized in that: A sealing gasket (211) is provided on the top side of the limiting step (21), and the lower side of the second inner cylinder (3) abuts against the limiting step (21) through the sealing gasket (211).

6. A pipe pressure test fixture according to claim 2, characterized in that: An annular groove (15) is provided on the outer peripheral wall of the second inner cylinder (3), a sealing rubber ring (151) is embedded in the annular groove (15), and the outer peripheral wall of the sealing rubber ring (151) is tightly pressed against the inner wall of the clamping outer cylinder (1).

7. A pipe pressure test fixture according to claim 2, characterized in that: The outer peripheral wall of the second inner cylinder (3) is provided with a convex step (33) on a side away from the first inner cylinder (2), and the outer peripheral wall of the first inner cylinder (2) is provided with a concave step (22) on a side close to the convex step (33); The outer portion of the second inner cylinder (3) is sleeved with a spring (34), and two ends of the spring (34) are respectively abutted between two opposite side surfaces of the concave step (22) and the convex step (33).

8. The pipe pressure test fixture according to claim 2, characterized in that: It also includes a positioning bolt (5) for fixing the relative positions of the clamping outer cylinder (1), the first inner cylinder (2) and the second inner cylinder (3); the clamping outer cylinder (1) is provided with a circular hole (16) for the positioning bolt (5) to pass through on the side wall away from the ventilation pipe (6); the first inner cylinder (2) is provided with a first waist-shaped hole (23) for the positioning bolt (5) to pass through on the side wall; and the second inner cylinder (3) is provided with a second waist-shaped hole (35) for the positioning bolt (5) to pass through on the side wall.

9. The pipe pressure test fixture according to claim 1, characterized in that: The vent pipe (6) is vertically penetrated through the clamping outer cylinder (1) and is detachably connected to the clamping outer cylinder (1).

10. The pipe pressure test fixture according to claim 1, characterized in that: A handle (7) is hinged on the side wall of the clamping end cover (4).

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