A full-condition steel-plastic composite pipe pipeline pressure test device

Abstract

The invention discloses a full-working-condition steel-plastic composite pipe pipeline pressure testing device, which is characterized in that it comprises an inner joint, an outer joint and a resisting assembly, wherein the inner joint comprises a sealing portion installed in the pipeline, a positioning portion formed in the middle of the sealing portion and protruding outward, and a joint portion extending outward in the middle of the positioning portion and passing through the outer joint, a water hole is provided in the joint portion, an external thread is provided on the outer wall of the joint portion, and a sealing ring is provided on the outer wall of the sealing portion, the external joint comprises an insertion portion inserted in the pipeline, a sleeve portion formed in the middle of the insertion portion and sleeved on the outer wall of the positioning portion, a locking piece for pressing the external joint onto the inner joint is provided on the outer wall of the joint portion, a water receiving piece is connected to the outer end of the external joint, and the resisting assembly is arranged on the outer wall of the pipeline, and the resisting assembly comprises a resisting piece arranged at the end of the pipeline, and the resisting piece has a resisting piece for blocking the outer wall of the insertion portion of the external joint.

Description

Technical Field

[0001] The invention relates to a pressure testing device, in particular to a full-operating-condition steel-plastic composite pipe pipeline pressure testing device. Background Art

[0002] In the production process of steel-plastic composite pipes (including pipes, pipe fittings, etc.), it is necessary to test the short-term hydrostatic strength and burst strength of the pipe body to detect the physical and mechanical properties and ultimate pressure of the pipe body, so as to timely adjust the steel skeleton structure in the steel-plastic composite pipe so that the produced products meet the standard requirements. For example, the existing publication number CN2565012Y shows "A special pressure test tool for steel-plastic composite pipes". During the pressure test, as the test water pressure gradually increases, when the axial force borne by the liner core exceeds the bite force between the pressure block and the outer plastic layer of the pipe, the pressure block will loosen, which will cause leakage and cause the test to fail. And because the left end of the liner core of the special pressure test tool is cylindrical, when the port of the pressure test pipe is deformed and out of round, the port must be rounded before the liner core can be installed, and then assembled, which is very cumbersome and time-consuming. In addition, the liner core and the sleeve in the pressure test tooling do not have a large mutual guiding fit. During the pressure test, it is difficult to ensure that the liner core and the pipe are coaxial in the early installation. Therefore, in the initial stage of the test pressurization, the left end face of the liner core will be subjected to uneven force, causing eccentricity between the liner core and the sleeve, causing the sealing surface of the sealing ring to be subjected to uneven force and leakage, resulting in failure of the pipeline pressure test.

[0003] However, there are many types of pipelines on site, such as flange-connected pipelines, flat-sealed pipelines, and conical-sealed pipelines. Existing pipeline pressure test devices require special pressure test tools to be designed for different working conditions. If there is no special pressure test tool, a flange joint must be welded at the end of the pressure test pipe to perform the pressure test. At the same time, the existing pressure test device is more troublesome in installation and disassembly. In addition, if the pipeline is not flange-connected, after the pressure test is completed, the flange joint of the pipeline port connected for the pressure test needs to be cut off. This increases the investment in the pipeline and the workload of the workers. In addition, since the metal exposed at the fracture of the steel-plastic composite pipe must be manually blocked at the construction site, it is easy to leave a safety hazard of pipeline leakage at that location. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a full-working condition steel-plastic composite pipe pipeline pressure testing device in response to the current status of the prior art, which is convenient for pressure testing installation and disassembly, will not cause damage to the pipeline port, and at the same time, can realize pressure testing for steel-plastic composite pipe pipelines with various working condition connection forms.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a full-working condition steel-plastic composite pipe pipeline pressure testing device, characterized in that it includes an inner joint, an outer joint and a resisting assembly, the inner joint includes a sealing part installed in the pipeline, a positioning part formed in the middle of the sealing part and protruding outward, and a joint part extending outward in the middle of the positioning part and passing through the outer joint, a water hole is opened in the joint part, an external thread is opened on the outer wall of the joint part, and a sealing ring is arranged on the outer wall of the sealing part, the external joint includes an insertion part inserted in the pipeline, a sleeve part formed in the middle of the insertion part and sleeved on the outer wall of the positioning part, a locking part for pressing the external joint onto the inner joint is arranged on the outer wall of the joint part, and the outer end of the external joint is connected to a water receiving part, the resisting assembly is arranged on the outer wall of the pipeline, and the resisting assembly includes a resisting part arranged at the end of the pipeline, and the resisting part has a resisting part for blocking the outer wall of the insertion part of the external joint.

[0006] As an improvement, a plurality of pull rings are circumferentially arranged on the outer wall of the insertion portion of the external connector, and each pull ring has a connection portion threadedly connected to the outer wall of the insertion portion. By arranging the pull rings, during the disassembly process after the pressure test of the pressure test device is completed, the pull ring can easily pull the external connector out of the pipeline.

[0007] As a further improvement, a plurality of stoppers are provided in an annular direction on the insertion part of the external joint, and each stopper includes a fixing part fixed on the insertion part and a stopper extending from the fixing part, and the stopper is located on the outer wall of the stopper. After the pipeline is filled with water and pressure maintained, the pressure test device needs to be disassembled, and the pressure test water in the pipeline is discharged from the pipeline. During this process, it is easy for the amount of water outflowing from the pipeline to be greater than the amount of air inflow. At this time, the pressure test device at the other end of the pipeline is easily sucked into the pipeline. The present invention can solve this problem well by using a stopper. When the pressure test device is sucked into the pipeline, the stopper on the external joint can block it at the end of the pipeline, thereby preventing the pressure test device from being sucked into the pipeline.

[0008] In addition, in response to different pipeline connection conditions, the resisting assembly can have multiple forms. The first one is that when encountering a flange-connected pipeline, the resisting assembly includes a bushing sleeved on the outer wall of the pipeline, a first resisting ring arranged at the bottom of the bushing, and a second resisting ring arranged at the end of the pipeline. A plurality of connecting bolts are arranged in a ring between the first resisting ring and the second resisting ring, and the second resisting ring is the resisting member; the second one is that when encountering a conical sealing pipeline connection condition, a conical portion is formed on the outer wall of the pipeline port. For this purpose, the resisting assembly includes a semicircular second A locking sleeve and a second locking sleeve, the inner circles of the first locking sleeve and the second locking sleeve are cones that match the tapered part of the outer wall of the pipeline port, the ends of the first locking sleeve and the second locking sleeve are formed with lugs, the lugs of the first locking sleeve and the lugs of the second locking sleeve are compressed by bolts, the first locking sleeve and the second locking sleeve are formed with a limiting ring near the end of the pipeline with the outer wall periphery of the insertion part of the external joint, the first locking sleeve and the second locking sleeve are formed with a hook part on the pipeline wall at the opposite end to the corresponding limiting ring, and the limiting ring is the stop part ; The third type, when encountering a flat-sealed pipeline working condition, the outer wall of the pipeline port is a smooth cylindrical wall. For this purpose, the resisting assembly includes a semicircular first locking sleeve, a second locking sleeve, a first barb arranged in the first locking sleeve, and a second barb arranged in the second locking sleeve. Lugs are formed at the ends of the first locking sleeve and the second locking sleeve, and the lugs of the first locking sleeve and the second locking sleeve are tightened by bolts. The first locking sleeve and the second locking sleeve are formed with a limiting ring near the end of the pipeline with the outer wall periphery of the insertion part of the external joint, and the limiting ring is The third type of the resisting part, when encountering a pipeline connection condition in the form of a flat sealing connection, it is only necessary to correspondingly add the first barb and the second barb to the inner circle of the first locking sleeve and the second locking sleeve used in the conical sealing pipeline connection condition, the outer circle of the first barb and the second barb matches the inner cone of the first locking sleeve and the second locking sleeve, and the length of the first barb and the second barb is less than the length of the inner cone of the matching first locking sleeve and the second locking sleeve, and the inner wall of the first barb and the second barb is formed with barbs for hooking the outer wall of the pipeline. The first locking sleeve and the second locking sleeve are formed with a limiting ring near the end of the pipeline with the outer wall periphery of the insertion part of the external joint, and the limiting ring is the resisting part. Since the outer cones of the first barb and the second barb are in sliding fit with the inner cones of the first locking sleeve and the second locking sleeve, the first locking sleeve and the second locking sleeve tend to slide outward due to the force applied to the resisting part during the pressure test. As the test pressure continues to rise, the inner cones of the first locking sleeve and the second locking sleeve will continuously squeeze the outer cones of the first barb and the second barb, so that the barbs on the inner circles of the first barb and the second barb fit more tightly with the outer wall of the pipe, thereby solving the problem in the prior art that when the axial force borne by the liner core exceeds the bite force between the pressure block and the outer plastic layer of the pipe as the test pressure rises, the pressure block becomes loose, leakage occurs, and the test fails.

[0009] In addition, a tapered portion is formed on the inner side of the sealing portion of the inner joint and is inserted into the pipeline port. Since the steel-plastic composite pipe is a non-metallic pipe, some deformation is inevitable during transportation and stacking, especially for larger-sized pipes, which are more severely deformed. At the same time, when installing the pressure test device, it is difficult for the inner joint to be coaxial with the pipe. The present invention forms a tapered portion with a guiding function outside the sealing portion of the inner joint. On the one hand, during installation, the tapered portion of the inner joint has a rounding effect on the pipeline port, thereby solving the problem of difficulty in installing the inner joint due to deformation of the pipeline port; on the other hand, the outer wall of the tapered portion is tightly attached to the inner wall of the pipeline port, thereby ensuring the coaxiality of the inner joint and the pipeline port.

[0010] Compared with the prior art, the advantages of the present invention are as follows: before the pipeline pressure test, a pressure test device is arranged at each port of the pipeline, the sealing ring is sleeved on the sealing part of the inner joint, the sealing part of the inner joint is inserted into the inner wall of the pipeline, and at the same time, the inserting part of the outer joint is also inserted into the inner wall of the pipeline, the positioning part of the inner joint is inserted into the sleeve part of the outer joint to form a positioning guide, the joint part of the inner joint passes through the sleeve part of the outer joint, a locking piece is arranged on the joint part, the locking piece presses the outer joint onto the inner joint, a water receiving piece is connected to the outer end of the joint part, and after the installation is completed, during the pressure test, high-pressure water is connected to the water receiving piece, the high-pressure water in the pipeline squeezes the inner joints in each pipeline port outward, the outer wall of the inserting part of the outer joint abuts against the blocking part of the blocking piece, and at the same time, the inner joint and the outer joint squeeze each other, which improves the seal. The sealing effect of the sealing ring is improved because the resistance component and the inner joint and the outer joint are designed separately in the present invention. In this way, the resistance component can be replaced as needed for different pipeline working conditions to achieve the resistance effect on the outer joint. Afterwards, the pressure is maintained and the sealing effect of the pipeline is checked. Finally, it is also convenient to disassemble the pressure test device. It is only necessary to remove the resistance component from the pipeline port. Afterwards, the inner joint and the outer joint can be removed from the pipeline. There is no need to weld the flange joint at the pipeline port, and after the pressure test is completed, there is no need to cut off the pipeline port flange joint connected for the pressure test, which reduces the investment in the pipeline and the workload of the workers. At the same time, since there is no need to perform secondary plugging on the port of the pressure test pipeline, the safety hazard of leakage in this part after the pipeline installation is completed is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the appearance structure of a pipeline pressure test device for flange connection working conditions in an embodiment of the present invention;

[0012] Figure 2 yes Figure 1 Schematic diagram of the decomposition structure;

[0013] Figure 3is a cross-sectional view of a pipeline pressure test device for flange connection working conditions in an embodiment of the present invention;

[0014] Figure 4 It is a schematic diagram of the appearance structure of a pipeline pressure testing device for flat sealing working conditions in an embodiment of the present invention;

[0015] Figure 5 yes Figure 4 Schematic diagram of the decomposition structure;

[0016] Figure 6 is a cross-sectional view of a pipeline pressure test device for flat sealing conditions in an embodiment of the present invention;

[0017] Figure 7 It is a schematic diagram of the appearance structure of a pipeline pressure testing device for a conical sealing working condition in an embodiment of the present invention;

[0018] Figure 8 It is a cross-sectional view of a pipeline pressure testing device for a conical sealing working condition in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below with reference to the accompanying drawings.

[0020] like Figures 1 to 8 As shown, the full-condition steel-plastic composite pipe pipeline pressure testing device in this embodiment includes an inner joint 2, an outer joint 3 and a resistance component.

[0021] Among them, the inner joint 2 includes a sealing portion 21 installed in the pipeline 1, a positioning portion 22 formed in the middle of the sealing portion 21 and protruding outward, and a joint portion 23 extending outward in the middle of the positioning portion 22 and passing through the external joint 3. A water hole is opened in the joint portion 23, and an external thread is opened on the outer wall of the joint portion 23. A sealing ring 9 is arranged on the outer wall of the sealing portion 21. The external joint 3 includes an insertion portion 31 inserted in the pipeline 1, a sleeve portion 32 formed in the middle of the insertion portion 31 and sleeved on the outer wall of the positioning portion 22. A locking member 71 is arranged on the outer wall of the joint portion 23 to press the external joint 3 onto the inner joint 2. Preferably, the locking member 71 is a locking nut. The outer end of the external joint 23 is connected to a water receiving member 72. The resisting assembly is arranged on the outer wall of the pipeline 1. The resisting assembly includes a resisting member arranged at the end of the pipeline, and the resisting member has a resisting portion for blocking the outer wall of the insertion portion 31 of the external joint 3.

[0022] In addition, a plurality of pull ring members 73 are circumferentially arranged on the outer wall of the insertion portion 31 of the external connector 3, and each pull ring member 73 has a connection portion threadedly connected to the outer wall of the insertion portion 31. By arranging the pull ring members 73, during the disassembly process after the pressure test of the pressure test device is completed, the pull ring members 73 can easily pull the external connector 3 out of the pipeline 1.

[0023] In addition, a plurality of stoppers 8 are circumferentially arranged on the insertion portion 31 of the external connector 3, and each stopper 8 includes a fixing portion 81 fixed on the insertion portion 31 and a stopper 82 extending from the fixing portion 81, and the stopper 82 is located on the outer wall of the stopper. After the pipeline 1 is filled with water and pressure maintained, the pressure test device needs to be disassembled, and the pressure test water in the pipeline 1 is discharged from the pipeline 1. During this process, it is easy for the amount of water discharged from the pipeline 1 to be greater than the amount of air inlet. At this time, the pressure test device at the other end of the pipeline 1 is easily sucked into the pipeline 1. The present invention uses the stopper 8 to solve this problem well. When the pressure test device is sucked into the pipeline 1, the stopper 8 on the external connector 3 can block the end of the pipeline 1, thereby preventing the pressure test device from being sucked into the pipeline 1.

[0024] In addition, a tapered portion 211 is formed inside the sealing portion 21 of the inner joint 2 to be inserted into the pipeline port. Since the steel-plastic composite pipe is a non-metallic pipe, some deformation is inevitable during transportation and stacking, especially for pipes of larger sizes, which are more seriously deformed. At the same time, when installing the pressure test device, it is difficult for the inner joint 2 to be coaxial with the pipe. The present invention forms a tapered portion 211 with a guiding function outside the sealing portion 21 of the inner joint 2. On the one hand, during installation, the tapered portion 211 of the inner joint 2 has a trimming effect on the pipeline port, and can repair the deformation of the pipeline port by itself, thereby solving the problem of difficult installation of the inner joint; on the other hand, the outer wall of the tapered portion 211 is tightly attached to the inner wall of the pipeline port, which plays a guiding role and ensures the coaxiality of the inner joint 2 and the pipeline port.

[0025] Finally, the present invention aims at the connection conditions of different pipelines, and the retaining assembly can have multiple forms. The first form is that when a flange is connected to a pipeline, the retaining assembly includes a bushing 43 sleeved on the outer wall of the pipeline 1, a first retaining ring 41 arranged at the bottom of the bushing 43, and a second retaining ring 42 arranged at the end of the pipeline 1. A plurality of connecting bolts are arranged in an annular manner between the first retaining ring 41 and the second retaining ring 42. The second retaining ring 42 is the retaining member, such as Figures 1 to 3 As shown; the second type, when encountering a conical sealing pipeline connection condition, a conical portion is formed at the outer wall of the pipeline 1 port. For this purpose, the resisting assembly includes a semicircular first locking sleeve 51 and a second locking sleeve 52. The inner circles of the first locking sleeve and the second locking sleeve are cones that match the conical portion of the outer wall of the pipeline port. Lugs 53 are formed at the ends of the first locking sleeve 51 and the second locking sleeve 52. Bolts are used to tighten the lugs of the first locking sleeve 51 and the second locking sleeve 52. A limiting ring 50 is formed near the end of the pipeline 1 with the outer wall periphery of the insertion portion 31 of the external joint 3. The limiting ring 50 is the resisting portion, as shown in FIG. Figure 7 and 8As shown; the third type, when encountering a flat sealing pipeline working condition, the outer wall of the pipeline 1 port is a smooth cylindrical wall. For this reason, the resisting assembly includes a semicircular first locking sleeve 51 and a second locking sleeve 52. The inner circles of the first locking sleeve 51 and the second locking sleeve 52 are cones. The outer circles of the first barb 511 arranged in the first locking sleeve 51 and the second barb 521 arranged in the second locking sleeve 52 are cones that match and fit the inner circles of the first locking sleeve 51 and the second locking sleeve 52. A sliding fit is adopted, and a lug 50 is formed at the end of the first locking sleeve 51 and the second locking sleeve 52. The lug of the first locking sleeve 51 and the lug of the second locking sleeve 52 are compressed by bolts. The first locking sleeve 51 and the second locking sleeve 52 are formed with a limiting ring 50 near the end of the pipeline 1 with the outer wall periphery of the insertion part 31 of the external joint 3. The limiting ring 50 is the resisting part. The inner walls of the first barb and the second barb are formed with barbs for hooking the outer wall of the pipeline 1. Figures 4 to 6 The third type, when encountering a pipeline connection condition of a flat sealing connection type, it is only necessary to add a first barb 511 and a second barb 521 to the inner circle of the first locking sleeve 51 and the second locking sleeve 52 used in the conical sealing pipeline connection condition. The outer circle of the first barb 511 and the second barb 521 matches the inner cone of the first locking sleeve 51 and the second locking sleeve 52, and the length of the first barb 511 and the second barb 521 is less than the length of the inner cone of the first locking sleeve 51 and the second locking sleeve 52, and the inner wall of the first barb 511 and the second barb 521 is formed with barbs for hooking the outer wall of the pipeline. The first locking sleeve 51 and the second locking sleeve 52 are formed with a limiting ring 50 near the end of the pipeline and connected to the outer wall periphery of the insertion part 31 of the external joint 3. The limiting ring 50 is the resisting part. Since the outer cone of the first barb 511 and the second barb 521 are in sliding fit with the inner cone of the first locking sleeve 51 and the second locking sleeve 52, the first locking sleeve 51 and the second locking sleeve 52 tend to slide outward due to the force applied to the resisting part during the pressure test. As the test pressure continues to rise, the inner cone of the first locking sleeve 51 and the second locking sleeve 52 will continuously squeeze the outer cone of the first barb 511 and the second barb 521, so that the barbs on the inner circle of the first barb 511 and the second barb 521 fit more tightly with the outer wall of the pipe, thereby solving the problem in the prior art that when the axial force borne by the liner core exceeds the bite force between the pressure block and the outer plastic layer of the pipe as the test pressure rises, the pressure block becomes loose, leakage occurs, and the test fails.

[0026] Before the pressure test of pipeline 1, a pressure test device is arranged at each port of pipeline 1, and the sealing ring 9 is sleeved on the plugging portion 21 of the inner joint 2, and the plugging portion 21 of the inner joint 2 is inserted into the inner wall of pipeline 1. At the same time, the inserting portion 31 of the outer joint 3 is also inserted into the inner wall of pipeline 1, and the positioning portion 22 of the inner joint 2 is inserted into the sleeve portion 32 of the outer joint 3 to form a positioning guide. The joint portion 23 of the inner joint 2 passes through the sleeve portion 32 of the outer joint 3, and a locking member 71 is arranged on the joint portion 23. The locking member 71 presses the outer joint 3 onto the inner joint 2, and a water receiving member 72 is connected to the outer end of the joint portion 23. After the installation is completed, during the pressure test, high-pressure water is connected to the water receiving member 72, and the high-pressure water in the pipeline 1 squeezes the inner joint 2 in each port of pipeline 2 outward, and the outer wall of the inserting portion 31 of the outer joint 3 abuts against the blocking portion of the blocking member. At the same time, the inner joint 3 and the outer joint The heads 3 are squeezed against each other, which improves the sealing effect of the sealing ring 9. Since the resistance component and the inner joint 2 and the outer joint 3 of the present invention are designed separately, the resistance component can be replaced as needed for different working conditions of the pipeline 1 to achieve the resistance effect on the outer joint 3. After that, the pressure is maintained and the sealing effect of the pipeline 1 is checked. Finally, it is also convenient to disassemble the pressure test device. It is only necessary to remove the resistance component from the port of the pipeline 1. After that, the inner joint 2 and the outer joint 3 can be removed from the pipeline. There is no need to weld the flange joint at the pipeline port, and after the pressure test is completed, there is no need to cut off the pipeline port flange joint connected for the pressure test, which reduces the investment in the pipeline and the workload of the workers. At the same time, since there is no need to perform secondary sealing on the port of the pressure test pipeline, the safety hazard of leakage in this part after the pipeline installation is completed is solved.

Claims

1. A full-condition steel-plastic composite pipe pipeline pressure test device, characterized in that: The invention comprises an inner joint (2), an outer joint (3) and a blocking assembly, wherein the inner joint (2) comprises a blocking portion (21) installed in the pipeline (1), a positioning portion (22) formed in the middle of the blocking portion (21) and protruding outward, a joint portion (23) extending outward from the middle of the positioning portion (22) and passing through the outer joint (3), a water hole is provided in the joint portion (23), an outer thread is provided on the outer wall of the joint portion (23), a sealing ring (9) is provided on the outer wall of the blocking portion (21), and the outer joint (3) comprises a sealing ring (9) inserted in the pipeline (1) An inserting portion (31), a sleeve portion (32) formed in the middle of the inserting portion (31) and sleeved on the outer wall of the positioning portion (22), a locking member (71) for pressing the outer joint (3) onto the inner joint (2) is arranged on the outer wall of the joint portion (23), the outer end of the outer joint (3) is connected to a water receiving member (72), the blocking component is arranged on the outer wall of the pipeline (1), the blocking component includes a blocking member arranged at the end of the pipeline (1), and the blocking member has a blocking portion for blocking the outer wall of the inserting portion (31) of the outer joint (3); A plurality of pull rings (73) are circumferentially arranged on the outer wall of the insertion portion (31) of the external joint (3), and each pull ring (73) has a connection portion threadedly connected to the outer wall of the insertion portion (31); A plurality of limiting members (8) are circumferentially arranged on the insertion portion (31) of the external joint (3), each limiting member (8) comprising a fixing portion (81) fixed on the insertion portion (31) and a limiting portion (82) extending from the fixing portion (81), the limiting portion (82) being located on the outer wall of the stopper.

2. The full-condition steel-plastic composite pipe pipeline pressure testing device according to claim 1 is characterized in that: The retaining assembly comprises a bushing (43) sleeved on the outer wall of the pipeline (1), a first retaining ring (41) arranged at the bottom of the bushing (43), and a second retaining ring (42) arranged at the end of the pipeline (1), a plurality of connecting bolts are arranged in an annular shape between the first retaining ring (41) and the second retaining ring (42), and the second retaining ring (42) is the retaining member.

3. The full-condition steel-plastic composite pipe pipeline pressure testing device according to claim 1 is characterized in that: The resisting assembly comprises a semicircular first locking sleeve (51) and a second locking sleeve (52), the ends of which are formed with lugs (53), the lugs of the first locking sleeve (51) and the lugs of the second locking sleeve (52) being compressed by bolts, the first locking sleeve (51) and the second locking sleeve (52) are formed with a limiting ring (50) near the end of the pipeline (1) and the outer wall periphery of the insertion part (31) of the external joint (3), the first locking sleeve (51) and the second locking sleeve (52) are formed with a hooking part for hooking the pipeline (1) on the pipe wall at the ends opposite to the corresponding limiting ring (50), and the limiting ring (50) is the resisting part.

4. The full-condition steel-plastic composite pipe pipeline pressure testing device according to claim 1 is characterized in that: The resisting assembly comprises a semicircular first locking sleeve (51), a second locking sleeve (52), a first barb (511) arranged in the first locking sleeve (51), and a second barb (521) arranged in the second locking sleeve (52); lugs (53) are formed at the ends of the first locking sleeve (51) and the second locking sleeve (52); the lugs of the first locking sleeve (51) and the lugs of the second locking sleeve (52) are compressed by bolts; a limiting ring (50) is formed near the ends of the pipeline (1) on the first locking sleeve (51) and the second locking sleeve (52) to engage with the outer wall periphery of the insertion part (31) of the external joint (3); the limiting ring (50) is the resisting part; and barbs for hooking the outer wall of the pipeline (1) are formed on the inner walls of the first barb (511) and the second barb (521).

5. The full-condition steel-plastic composite pipe pipeline pressure testing device according to claim 1 is characterized in that: A tapered portion (211) is formed inside the sealing portion (21) of the internal joint (2) and is inserted into the pipeline port.

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