Tool for pressure test of metal hose body

Abstract

The utility model relates to a tool for pressure testing of a metal hose body, and belongs to the technical field of fluid sealing performance testing of structural components. The tool comprises a hollow rod, an injection molding connector and a plug, a first core rod connector and a second core rod connector are welded to the two ends of the hollow rod respectively, the core rod connectors are provided with internal and external threads, the internal threads of the core rod connectors are in threaded connection with the injection molding connector and the plug respectively, and the external threads of the core rod connectors are in threaded connection with a first sheath connector and a second sheath connector respectively. A first containing groove and a second containing groove are formed in the two close ends of the sheath connector respectively, and the containing grooves are clamped to the two ends of the sheath respectively. The plug is in threaded connection with a check ring and sleeved with two space rings, two O-shaped rings are arranged between the two space rings and between the two space rings and the check ring, and the injection molding connector and the plug are the same in structure and further provided with an axial through hole. During pressure testing, the metal hose body is sleeved on the outer wall of the O-shaped ring, two ends of the metal hose body are respectively abutted against two ends of the injection pressure joint and the plug, and collision damage to the inner wall and the outer wall of the metal hose body is avoided.

Description

Technical Field

[0001] The utility model relates to a tool for pressure testing of a metal hose body, belonging to the technical field of fluid tightness testing (G01M3 / 00) of structural components. Background Art

[0002] Metal hoses are important components in the connection pipelines of modern industrial equipment. Metal hoses are used as wire and cable protection tubes for wires, cables, automation instrument signals, and civilian shower hoses, with specifications ranging from 3mm to 150mm. Small-diameter metal hoses (inner diameter 3mm-25mm) are mainly used for sensor line protection of precision optical rulers and industrial sensor line protection.

[0003] When testing the pressure of the metal hose body, the two-end clamping tooling or the inner mandrel tooling is often used for pressure testing. The two-end clamping tooling will clamp on the joints at both ends of the pipe body during the pressure test, resulting in indentations on the surfaces of both ends of the pipe body after the pressure test, causing damage to the outer wall of the pipe body; the mandrel of the inner mandrel tooling is made of stainless steel hard material, and improper operation can easily cause the inner wall of the corrugated pipe to bump against it, causing damage to the inner wall of the pipe body. Summary of the invention

[0004] The technical problem to be solved by the utility model is: how to avoid damage to the inner and outer walls of the metal hose body during pressure testing of the hose body.

[0005] The utility model proposes a technical solution to solve the above technical problems: a tool for pressure testing of a metal hose body, comprising a hollow rod and an injection-pressure joint and a plug respectively arranged at both ends of the hollow rod, the injection-pressure joint and the outer ring of the plug forming four step horizontal surfaces and three step vertical surfaces from low to high from the inside to the outside, the four step horizontal surfaces and the three step vertical surfaces are alternately connected to each other, and the two low step horizontal surfaces of the injection-pressure joint and the plug are both provided with external threads; a first core rod joint and a second core rod joint are respectively welded at both ends of the hollow rod, the core rod joint is provided with internal and external threads, the internal threads of the core rod joint are respectively screwed with the external threads on the lowest step horizontal surfaces of the injection-pressure joint and the plug, the external threads of the core rod joint are respectively screwed with the internal threads of the first sheath joint and the second sheath joint, the first sheath joint and the second sheath joint are respectively provided with a first accommodating groove and a second accommodating groove at the adjacent two ends, the first accommodating groove and the second accommodating groove are respectively clamped at the two ends of the sheath; the second lowest step horizontal surface of the injection and pressure joint is screwed with a first retaining ring on the external thread, and the second lowest step horizontal surface of the plug is screwed with a second retaining ring on the external thread; the second highest step horizontal surface of the injection and pressure joint is provided with a first spacer ring and a second spacer ring from the inside to the outer shell, a first O-ring is provided between the first spacer ring and the second spacer ring, a second O-ring is provided between the first spacer ring and the first retaining ring, the second highest step horizontal surface of the plug is provided with a third spacer ring and a fourth spacer ring from the inside to the outer shell, a third O-ring is provided between the third spacer ring and the fourth spacer ring, and a fourth O-ring is provided between the third spacer ring and the second retaining ring; the injection and pressure joint is provided with perforations along the axial line; during the pressure test, the metal hose body is sleeved on the outer wall of the O-ring, and the two end faces of the metal hose body are respectively pressed against the two highest step vertical faces of the injection and pressure joint and the plug and are pressed.

[0006] Furthermore, a first core rod joint and a second core rod joint are respectively welded at two ends of the hollow rod by argon arc welding.

[0007] Furthermore, the hollow rod is provided with a through hole.

[0008] Furthermore, the sheath is provided with a through hole.

[0009] Furthermore, the sheath joint is a polytetrafluoroethylene sheath joint.

[0010] Furthermore, the retaining ring is a retaining ring made of polytetrafluoroethylene.

[0011] Furthermore, the O-ring is a sealing ring made of fluororubber or soft non-metallic material.

[0012] The beneficial effects of the utility model are as follows: due to the specially designed injection-pressure joint and plug with multiple steps on the outer circumference, multiple sealing surfaces can be formed, thereby increasing the sealing performance during pressure testing; especially during pressure testing, the metal hose body is sleeved on the outer wall of the O-ring, and the two end faces of the metal hose body are respectively pressed against the two highest step vertical faces of the injection-pressure joint and the plug and are tightly pressed, which not only ensures the sealing performance of the metal hose during pressure testing, but also because the sheath joint, retaining ring, O-ring and sheath in contact with the metal hose body are all made of non-metallic soft materials, they will not cause bumps and damage to the inner and outer walls of the metal hose body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following is a further description of the tooling for pressure testing the metal hose body of the present invention in conjunction with the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of a tool for pressure testing a metal hose body in an embodiment.

[0015] Figure 2 yes Figure 1 Schematic diagram of the structure of the split plug.

[0016] Figure 3 yes Figure 1 Schematic diagram of the structure of the injection-pressure joint split in the figure.

[0017] Figure 4 yes Figure 1 Schematic diagram of the structure of the first core rod joint split in the figure.

[0018] Figure 5 yes Figure 1 Schematic diagram of the structure of the second core rod joint split in the middle.

[0019] Figure 6 yes Figure 1 Schematic diagram of the structure of the first sheath joint split in the figure.

[0020] Figure 7 yes Figure 1 Schematic diagram of the structure of the second sheath joint split in the middle.

[0021] Figure 8 yes Figure 1 Schematic diagram of the structure of the hollow rod split in the figure.

[0022] Fig. 9 yes Figure 1 Schematic diagram of the structure of the sheath split in the figure.

[0023] In the figure: 1. hollow rod; 2. injection-pressure joint; 3. plug; 4. first core rod joint; 5. second core rod joint; 6. first sleeve joint; 7. second sleeve joint; 8. first receiving groove; 9. second receiving groove; 10. sleeve; 11. first retaining ring; 12. second retaining ring; 13. second spacer; 14. first spacer; 15. first O-ring; 16. second O-ring; 17. fourth spacer; 18. third spacer; 19. third O-ring; 20. fourth O-ring; 21. perforation; 22. first external thread; 23. first internal thread; 24. second external thread; 25. second internal thread; 26. through hole. DETAILED DESCRIPTION Example

[0024] In this embodiment, Figure 1 As shown, it includes a hollow rod 1 and an injection joint 2 and a plug 3 respectively placed at both ends of the hollow rod 1. The outer rings of the injection joint 2 and the plug 3 form four horizontal stepped surfaces and three vertical stepped surfaces from low to high from the inside to the outside. The four horizontal stepped surfaces and the three vertical stepped surfaces are alternately connected to each other. Figure 2 and Figure 3 As shown, the two low-step horizontal surfaces of the injection joint 2 and the plug 3 are both provided with first external threads 22. Figure 1 , Figure 4 and Figure 5 As shown, the two ends of the hollow rod 1 are respectively welded with a first core rod joint 4 and a second core rod joint 5 by argon arc welding, and the core rod joints have a first internal thread 23 and a second external thread 24. The first internal thread 23 of the core rod joint is respectively screwed with the first external thread 22 on the lowest step level of the injection joint 2 and the plug 3, as shown in FIG. Figure 1 , Figure 6 and Figure 7 The second external thread 24 of the core rod joint is threadedly connected with the second internal thread 25 of the first sheath joint 6 and the second sheath joint 7 respectively. The first sheath joint 6 and the second sheath joint 7 are respectively provided with a first receiving groove 8 and a second receiving groove 9 at the ends thereof, and the first receiving groove 8 and the second receiving groove 9 are respectively clamped at the two ends of the sheath 10. Figure 1As shown, the first external thread 22 of the second low step level of the injection and pressure joint 2 is threaded with the first retaining ring 11, and the first external thread 22 of the second low step level of the plug 3 is threaded with the second retaining ring 12. The second high step level of the injection and pressure joint has a first spacer 14 and a second spacer 13 from the inside to the outside, a first O-ring 15 is provided between the first spacer 14 and the second spacer 13, and a second O-ring 16 is provided between the first spacer 14 and the first retaining ring 11. The third high step level of the plug has a third spacer 18 and a fourth spacer 17 from the inside to the outside, a third O-ring 19 is provided between the third spacer 18 and the fourth spacer 17, and a fourth O-ring 20 is provided between the third spacer 18 and the second retaining ring 12. The four O-rings provide better sealing for the sealing ring made of fluororubber. The injection and pressure joint is provided with a through hole 21 along the axial line.

[0025] During the pressure test, the metal hose body is sleeved on the outer wall of the O-ring, and the two end faces of the metal hose body are respectively against the two highest stepped vertical faces of the injection and pressure fitting 2 and the plug 3 and are pressed tightly. The polytetrafluoroethylene sheath joint, polytetrafluoroethylene retaining ring, fluororubber sealing O-ring and sheath in contact with the metal hose body are all made of non-metallic soft materials, so they will not cause bumps and damage to the inner and outer walls of the metal hose body.

[0026] like Figure 8 and Fig. 9 As shown, the surface of the sheath 10 and the hollow rod 1 are provided with multiple through holes 26, so that the injected gas can be transferred into the metal hose body. Then the metal hose body pressure test tool together with the metal hose is put into water to observe whether there is leakage.

[0027] The present invention is not limited to the above-mentioned embodiments, and any technical solutions formed by equivalent replacement shall fall within the protection scope required by the present invention.

Claims

1. A tool for pressure testing of a metal hose body, characterized in that : It includes a hollow rod and an injection-pressure joint and a plug respectively arranged at both ends of the hollow rod, the injection-pressure joint and the outer ring of the plug form four stepped horizontal surfaces and three stepped vertical surfaces from low to high from the inside to the outside, the four stepped horizontal surfaces and the three stepped vertical surfaces are alternately connected to each other, and the two low-step horizontal surfaces of the injection-pressure joint and the plug are provided with external threads; the first core rod joint and the second core rod joint are respectively welded at both ends of the hollow rod, the core rod joint is provided with internal and external threads, the internal threads of the core rod joint are respectively screwed with the external threads on the lowest step horizontal surfaces of the injection-pressure joint and the plug, the external threads of the core rod joint are respectively screwed with the internal threads of the first sheath joint and the second sheath joint, the first sheath joint and the second sheath joint are respectively provided with a first accommodating groove and a second accommodating groove at the two ends close to each other, the first accommodating groove and the second accommodating groove are respectively clamped at the two ends of the sheath; the The second lowest step horizontal surface of the injection and pressure joint is threaded with a first retaining ring on the external thread, and the second lowest step horizontal surface of the plug is threaded with a second retaining ring on the external thread; the second highest step horizontal surface of the injection and pressure joint is provided with a first spacer ring and a second spacer ring from the inside to the outside, a first O-ring is provided between the first spacer ring and the second spacer ring, a second O-ring is provided between the first spacer ring and the first retaining ring, the second highest step horizontal surface of the plug is provided with a third spacer ring and a fourth spacer ring from the inside to the outside, a third O-ring is provided between the third spacer ring and the fourth spacer ring, and a fourth O-ring is provided between the third spacer ring and the second retaining ring; the injection and pressure joint is provided with perforations along the axial line; during the pressure test, the metal hose body is sleeved on the outer wall of the O-ring, and the two end faces of the metal hose body are respectively pressed against the two highest step vertical faces of the injection and pressure joint and the plug and are pressed.

2. The tooling according to claim 1, characterized in that: The two ends of the hollow rod are respectively welded with a first core rod joint and a second core rod joint by argon arc welding.

3. The tooling according to claim 1, characterized in that: The hollow rod is provided with a through hole.

4. The tooling according to claim 1, characterized in that: The sheath is provided with a through hole.

5. The tooling according to claim 1, characterized in that: The sheath joint is a polytetrafluoroethylene sheath joint.

6. The tooling according to claim 1, characterized in that: The retaining ring is a polytetrafluoroethylene retaining ring.

7. The tooling according to claim 1, characterized in that: The O-ring is a sealing ring made of fluororubber or soft non-metallic material.

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