Steel pipe joint airtightness inspection device

Abstract

The utility model relates to the technical field of pressure detection, and discloses a steel pipe joint airtightness inspection device, which comprises a base, a fixed seat and a movable seat are arranged on the base, the fixed seat is fixedly connected to the right side of the upper part of the base, a guide rail is fixed to the left side of the upper part of the base, and the movable seat is arranged on the upper part of the guide rail. A hydraulic cylinder is arranged on the left side of the movable seat and fixed to the upper portion of the base, and a plunger of the hydraulic cylinder is in threaded connection with the movable seat through a right-hand and left-hand thread nut. A cylindrical push head B extends out of the left side of the fixing base, the fixing base and the push head B are of an integrated structure, the outer wall of the push head B is sleeved with one end of a sealing sleeve B, the outer wall of the push head B is sleeved with a third sealing ring, the third sealing ring is arranged between the sealing sleeve B and the push head B, and a second annular protrusion is arranged on the inner wall of the sealing sleeve B.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure detection, in particular to an airtightness inspection device for a steel pipe joint. Background Art

[0002] Steel pipe joints usually need to be inspected for air tightness to ensure that the air tightness of the pipe joints meets the design requirements, ensuring that there is no oil or air leakage under a certain pressure, ensuring the normal operation of machinery and equipment, and reducing equipment maintenance and overhaul. The most common way to inspect air tightness is to inflate the pipe joint to block the other end, and then observe the changes in the pressure gauge to determine whether the pipe joint is leaking. Since the diameter of the pressure gauge is generally very small, mostly around 100mm, the operator needs to observe the pressure gauge closely. When inspecting the air tightness of high-pressure or ultra-high-pressure pipe joints, air leakage from the pipe joint will cause harm to the operator's personal safety. Utility Model Content

[0003] In order to overcome the above-mentioned deficiencies, the utility model provides an airtightness inspection device for steel pipe joints.

[0004] The technical solution adopted by this utility model:

[0005] A device for inspecting air tightness of a steel pipe joint comprises a base; a fixed base and a movable base are provided on the base, the fixed base is fixedly connected to the right side of the upper portion of the base, a guide rail is fixed to the left side of the upper portion of the base, a movable base is provided on the upper portion of the guide rail, the movable base is slidably connected to the left side of the base via the guide rail, a hydraulic cylinder is provided on the left side of the movable base, the hydraulic cylinder is fixed to the upper portion of the base, and a plunger of the hydraulic cylinder and the movable base are threadedly connected via a forward and reverse threaded nut;

[0006] A cylindrical pusher head B extends from the left side of the fixed seat. The fixed seat and the pusher head B are integrated into a structure. The outer wall of the pusher head B is sleeved on one end of the sealing sleeve B. The outer wall of the pusher head B is sleeved on the sealing ring three. There is a sealing ring three between the sealing sleeve B and the pusher head B. An annular protrusion two is provided on the inner wall of the sealing sleeve B. The left end face of the annular protrusion two is embedded in the sealing ring four. The right side of the annular protrusion two is gap-fitted with the pusher head B; a cylindrical pusher head A extends from the right side of the movable seat. The outer wall of the pusher head A is sleeved on the sealing ring one. The outer side of the pusher head A is sleeved on one end of the sealing sleeve A. There is a sealing ring one between the pusher head A and the sealing sleeve A. The inner wall of the sealing sleeve A is provided with an annular protrusion one. One side of the annular protrusion one is gap-fitted with the pusher head A. The outer wall of the annular protrusion one is inlaid with the sealing ring two at the other end;

[0007] The fixing seat has an air inlet hole, which is in a horizontal state and passes through the fixing seat. The air inlet hole is connected to the outside at the right end face of the fixing seat. There is a threaded hole on the right inner wall of the air inlet hole. There is an inspection hole inside the fixing seat, which passes through the upper part of the fixing seat. The inspection hole is vertically arranged, and the inspection hole is connected to the air inlet hole. The inspection hole extends upward to the upper end face of the fixing seat and is connected to the outside. A cylinder sleeve is provided on the upper part of the fixing seat, and the bottom of the cylinder sleeve is connected to the inspection hole through a threaded connection. There is a sealing gasket between the bottom of the cylinder sleeve and the upper part of the fixing seat, and there is a sealing gasket between the inspection holes. The cavity is connected to the inspection air hole, and there is a piston inside the cylinder liner. The inner wall of the cylinder liner and the piston are tightly slidably matched. The upper part of the piston is fixedly connected to the push rod, which passes through the upper part of the cylinder liner. The push rod and the upper part of the cylinder liner are clearance-matched. A compression spring is provided on the upper part of the piston, and the spring is sleeved on the outside of the push rod. The two ends of the spring are respectively in contact with the inner top wall of the cylinder liner and the upper part of the piston. The upper part of the fixed seat is fixedly connected to the column, and the pointer is hinged on the column. The pointer is at the upper end of the push rod. A dial is provided on the other side of the pointer, and a scale line is engraved on the dial. The dial is fixedly connected to the support plate, and the support plate is fixedly connected to the upper part of the fixed seat.

[0008] A protective sleeve is formed between the right side of the annular protrusion 1 and the right end opening of the sealing sleeve A, and a protective sleeve is formed between the left side of the annular protrusion 2 and the left opening of the sealing sleeve B. The inner hole of the protective sleeve is larger than the outer diameter of the inspected pipe joint.

[0009] Beneficial effects of the utility model:

[0010] By setting a cylinder sleeve and a piston on the fixed seat, using air pressure to lift the pointer, and observing the changes in the position of the pointer on the dial in a safe position to judge the air tightness of the pipe joint, the personal safety of the operator is guaranteed. At the same time, a protective cover is provided, so that even if the sealing parts at both ends of the pipe joint fail, the operator will not be injured. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 yes Figure 1 Enlarged view of point A.

[0013] The specific reference numerals in all the drawings are: 1. base; 2. fixed seat; 3. movable seat; 4. hydraulic cylinder; 5. push head A; 6. sealing sleeve A; 7. push head B; 8. sealing sleeve B; 9. air inlet; 10. inspection hole; 11. forward and reverse buckle nut; 12. guide rail; 13. protective sleeve; 14. cylinder liner; 15. piston; 16. compression spring; 17. push rod; 18. pointer; 19. dial; 20. support plate; 2. column; 22. sealing ring one; 23. annular protrusion one; 24. sealing ring two; 25. sealing ring three; 26. annular protrusion two; 27. sealing ring four. DETAILED DESCRIPTION

[0014] like Figure 1-2 The figure shows a steel pipe joint airtightness inspection device, comprising a base 1, a fixed base 2 and a movable base 3 provided on the base 1, the fixed base 2 being fixedly connected to the upper right side of the base 1, a guide rail 12 being fixed to the upper left side of the base 1, a movable base 3 being provided on the upper portion of the guide rail 12, the movable base 3 being slidably connected to the left side of the base 1 via the guide rail 12, a hydraulic cylinder 4 being provided on the left side of the movable base 3, the hydraulic cylinder 4 being fixed to the upper portion of the base 1, the plunger of the hydraulic cylinder 4 being threadedly connected to the movable base 3 via a forward and reverse threaded nut 11;

[0015] A cylindrical pusher head B7 extends from the left side of the fixed seat 2. The fixed seat 2 and the pusher head B7 are integrally structured. The outer wall of the pusher head B7 is sleeved on one end of the sealing sleeve B8. The outer wall of the pusher head B7 is sleeved on a sealing ring 3 25. A sealing ring 3 25 is provided between the sealing sleeve B8 and the pusher head B7. An annular protrusion 2 26 is provided on the inner wall of the sealing sleeve B8. The left end face of the annular protrusion 26 is embedded in a sealing ring 4 27. The right side of the annular protrusion 26 is gapped with the pusher head B7; a cylindrical pusher head A5 extends from the right side of the movable seat 3. The outer wall of the pusher head A5 is sleeved on a sealing ring 1 22. The outer side of the pusher head A5 is sleeved on one end of the sealing sleeve A6. A sealing ring 1 22 is provided between the pusher head A5 and the sealing sleeve A6. The inner wall of the sealing sleeve A6 is provided with an annular protrusion 1 23. One side of the annular protrusion 1 23 is gapped with the pusher head A5. The outer wall of the annular protrusion 1 23 is inlaid with a sealing ring 24 at the other end;

[0016] The fixing seat 2 has an air inlet 9, which is in a horizontal state. The air inlet 9 passes through the fixing seat 2. The air inlet 9 is connected to the outside at the right end face of the fixing seat 2. The right inner wall of the air inlet 9 has a threaded hole. The fixing seat 2 has an inspection air hole 10 inside. The inspection air hole 10 passes through the upper part of the fixing seat 2. The inspection air hole 10 is vertically arranged. The inspection air hole 10 is connected with the air inlet 9. The inspection air hole 10 extends upward to the upper end face of the fixing seat 2 and is connected to the outside. A cylinder sleeve 14 is provided on the upper part of the fixing seat 2. The bottom of the cylinder sleeve 14 is connected to the inspection air hole 10 by a threaded connection. There is a sealing gasket between the bottom of the cylinder sleeve 14 and the upper part of the fixing seat 2. There is a sealing gasket between the inspection air holes 10. The inner cavity of the cylinder sleeve 14 is connected to the inspection air hole 10. The sleeve 14 is provided with a piston 15 inside, and the inner wall of the cylinder sleeve 14 slides tightly with the piston 15. The upper part of the piston 15 is fixedly connected to the push rod 17, which passes through the upper part of the cylinder sleeve 14. The push rod 17 and the upper part of the cylinder sleeve 14 have a clearance fit. A compression spring 16 is provided on the upper part of the piston 15, and the spring 16 is sleeved on the outside of the push rod 17. The two ends of the spring 16 respectively abut against the inner top wall of the cylinder sleeve 14 and the upper part of the piston 15. The upper part of the fixed seat 2 is fixedly connected to the column 21, and the column 21 is hinged to the pointer 18. The pointer 18 is at the upper end of the push rod 17. A dial 19 is provided on the other side of the pointer 18. A scale line is engraved on the dial 19. The dial 19 is fixedly connected to the support plate 20, and the support plate 20 is fixedly connected to the upper part of the fixed seat 2.

[0017] A protective sleeve 13 is formed between the right side of the annular protrusion 1 23 and the right end opening of the sealing sleeve A6, and a protective sleeve 13 is formed between the left side of the annular protrusion 26 and the left opening of the sealing sleeve B8. The inner hole of the protective sleeve 13 is larger than the outer diameter of the inspected pipe joint.

[0018] When performing an airtightness check, the hydraulic cylinder 4 is turned on to push the movable seat 3 to the right. The two ends of the round tube with the joint enter the protective sleeves 13 on both sides respectively. The sealing ring 24 and the sealing ring 4 27 seal the two ends of the round tube with the joint. The intake pipe thread is sealed and connected to the intake hole 9. The air pressure is increased to perform an airtightness check. At this time, the air pressure pushes the piston 15 and the push rod 17 to rise. The push rod 17 lifts the pointer 18 to rotate around the hinge center of the column 21. The position of the pointer 18 on the dial 19 changes. It is possible to clearly observe whether the air pressure drops from a distance, thereby improving safety during operation.

[0019] The inner hole of the protective sleeve 13 is larger than the outer diameter of the round pipe with the joint being inspected. By installing a cylinder sleeve 14 and a piston 15 on the fixed base 2, air pressure is used to lift the pointer 18. The airtightness of the pipe joint can be determined by observing the change in the position of the pointer 18 on the dial 19 from a safe position, ensuring the personal safety of the operator. At the same time, the protective sleeve 13 is provided, so that even if the sealing parts at both ends of the pipe joint fail, the operator will not be injured.

[0020] This utility model only protects the mechanical structure part, and the related software control part is not within the protection scope of this utility model.

Claims

1. A steel pipe joint airtightness inspection device, comprising a base (1), characterized in that: A fixed seat (2) and a movable seat (3) are provided on the base (1); the fixed seat (2) is fixedly connected to the right side of the upper portion of the base (1); a guide rail (12) is fixed to the left side of the upper portion of the base (1); a movable seat (3) is provided on the upper portion of the guide rail (12); the movable seat (3) is slidably connected to the left side of the base (1) through the guide rail (12); a hydraulic cylinder (4) is provided on the left side of the movable seat (3); the hydraulic cylinder (4) is fixed to the upper portion of the base (1); a plunger of the hydraulic cylinder (4) and the movable seat (3) are threadedly connected via a forward and reverse threaded nut (11); A cylindrical push head B (7) extends from the left side of the fixed seat (2). The fixed seat (2) and the push head B (7) are an integral structure. The outer wall of the push head B (7) is sleeved on one end of the sealing sleeve B (8). The outer wall of the push head B (7) is sleeved on the sealing ring three (25). There is a sealing ring three (25) between the sealing sleeve B (8) and the push head B (7). An annular protrusion two (26) is provided on the inner wall of the sealing sleeve B (8). The left end face of the annular protrusion two (26) is embedded in the sealing ring four (27). The right side of the annular protrusion two (26) is connected to the push head B (7). The head B (7) is clearance-fitted; a cylindrical push head A (5) is extended from the right side of the movable seat (3); the outer wall of the push head A (5) is sleeved with a sealing ring (22); the outer side of the push head A (5) is sleeved on one end of the sealing sleeve A (6); a sealing ring (22) is provided between the push head A (5) and the sealing sleeve A (6); an annular protrusion (23) is provided on the inner wall of the sealing sleeve A (6); one side of the annular protrusion (23) is clearance-fitted with the push head A (5); and the outer wall of the other end of the annular protrusion (23) is inlaid with a sealing ring (24); The fixing seat (2) has an air inlet (9), the air inlet (9) is in a horizontal state, the air inlet (9) passes through the fixing seat (2), the air inlet (9) is connected to the outside at the right end surface of the fixing seat (2), the right inner wall of the air inlet (9) has a threaded hole, the fixing seat (2) has an inspection air hole (10), the inspection air hole (10) passes through the upper part of the fixing seat (2), the inspection air hole (10) is vertically arranged, the inspection air hole (10) is connected to the air inlet (9), the inspection air hole (10) extends upward to the upper end surface of the fixing seat (2) and is connected to the outside, the upper part of the fixing seat (2) is provided with a cylinder sleeve (14), the bottom of the cylinder sleeve (14) is connected to the inspection air hole (10) by a thread, a sealing gasket is provided between the bottom of the cylinder sleeve (14) and the upper part of the fixing seat (2), a sealing gasket is provided between the inspection air hole (10), the inner cavity of the cylinder sleeve (14) is connected to the inspection air hole (10), the cylinder sleeve (14) is connected to the inspection air hole (10), and the cylinder sleeve (14) is connected to the inspection air hole (10). ) has a piston (15) inside, the inner wall of the cylinder sleeve (14) and the piston (15) are tightly slidably matched, the upper part of the piston (15) is fixedly connected to the push rod (17), the push rod (17) passes through the upper part of the cylinder sleeve (14), the push rod (17) and the upper part of the cylinder sleeve (14) are clearance-matched, and a compression spring (16) is provided on the upper part of the piston (15), the spring (16) is sleeved on the outside of the push rod (17), and the two ends of the spring (16) are respectively abutted against the cylinder sleeve. The inner top wall of (14) and the upper part of the piston (15), the upper part of the fixing seat (2) is fixedly connected to the column (21), the column (21) is hingedly connected to the pointer (18), the pointer (18) is at the upper end of the push rod (17), the other side of the pointer (18) is provided with a dial (19), the dial (19) is engraved with scale lines, the dial (19) is fixedly connected to the support plate (20), and the support plate (20) is fixedly connected to the upper part of the fixing seat (2).

2. The airtightness inspection device for steel pipe joints according to claim 1, characterized in that: A protective sleeve (13) is formed between the right side of the annular protrusion 1 (23) and the right end opening of the sealing sleeve A (6), and a protective sleeve (13) is formed between the left side of the annular protrusion 2 (26) and the left side opening of the sealing sleeve B (8). The inner hole of the protective sleeve (13) is larger than the outer diameter of the pipe joint to be inspected.

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