A positive pressure waterproof and airtightness detection device for urban gas pipelines

Abstract

The present invention relates to the technical field of sealing performance testing of gas pipelines, and discloses a positive pressure waterproof sealing detection device for urban gas pipelines, including a clamping member, an air inlet pipe, and a pressure monitor. The clamping member is used for clamping the pipeline to be tested; the air inlet pipe is used for communicating with the pipeline to be tested, and an air pump can introduce gas with a certain pressure into the pipeline to be tested through the air inlet pipe; the pressure monitor is used for detecting and recording the pressure change in the pipeline to be tested; the clamping member includes a moving component and a clamping groove. Among them, the groove diameter of the clamping groove is not less than the pipe body diameter of the pipeline to be tested and not greater than the end joint diameter of the pipeline to be tested. The moving component is used to realize the relative movement between the clamping groove and the gas pipeline. Its advantages are: it can simplify the operation steps of the operator during the sealing detection of the gas pipeline, optimize the detection process, and improve the overall detection efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing performance testing of gas pipelines, and particularly relates to a positive pressure waterproof sealing detection device for urban gas pipelines. Background Art

[0002] In cities, there are many residences, a large amount of gas is used, there are relatively many gas pipelines connected to users, and the water vapor content in the kitchen is relatively large. Therefore, the gas pipelines need to have high waterproof sealing performance. Existing gas appliances are usually connected by corrugated hoses, which are generally composed of stainless steel corrugated pipes, PVC outer protective layers, and connectors at both ends. When the gas pipelines leave the factory, in order to ensure their waterproof sealing performance, a airtightness detector is needed to detect their sealing performance. In the standard of sealing performance detection, the hose should be tested under at least 0.5 Mpa air pressure for 1 minute without air leakage.

[0003] Before the gas pipelines leave the factory, the sealing performance of each gas pipeline needs to be detected. During the detection, the connectors at both ends of the gas pipeline need to be aligned with the connectors of the air pump in turn to avoid the non-standard connection between the air pump and the gas pipeline, which may reduce the reliability of the test results. However, the alignment operation for each pipeline significantly increases the workload and reduces the detection efficiency.

[0004] In summary, there is an urgent need for a gas pipeline sealing detection device that can simplify the operation steps of the operator, optimize the detection process, and improve the overall detection efficiency during the sealing detection of gas pipelines. Summary of the Invention

[0005] In view of the problem of low connection operation efficiency of the connectors during the sealing detection of gas pipelines in the prior art, a positive pressure waterproof sealing detection device for urban gas pipelines is proposed.

[0006] To solve the above problems, the technical solution of the present invention is as follows:

[0007] A positive pressure waterproof sealing detection device for urban gas pipelines includes a clamping member, an air inlet pipe, and a pressure monitor. The clamping member is used to clamp the pipeline to be tested; the air inlet pipe is used to communicate with the pipeline to be tested, and an air pump can introduce a certain pressure of gas into the pipeline to be tested through the air inlet pipe; the pressure monitor is used to detect and record the pressure change in the pipeline to be tested; the air inlet pipe and the clamping member are on the same straight line. The clamping member includes a moving component and a clamping groove. The clamping groove is used to clamp the pipe body between the connectors at both ends of the pipeline to be tested. Among them, the groove diameter of the clamping groove is not less than the pipe body diameter of the pipeline to be tested and not greater than the diameter of the end connector of the pipeline to be tested. The moving component is used to drive the clamping groove to move towards the air inlet pipe.

[0008] As a preferred technical solution, the clamping groove is a U-shaped groove, and a V-shaped expansion opening is provided at its notch.

[0009] As a preferred technical solution, there are two groups of the clamping members, and the moving assembly drives the two groups of opposite clamping members away from or close to each other simultaneously.

[0010] As a preferred technical solution, the moving assembly includes a screw rod. Among them, two threads with opposite helix directions are provided on the screw rod, and each clamping member is respectively arranged on the two threads with opposite helix directions.

[0011] As a preferred technical solution, the groove diameter of the clamping groove is larger than the pipe body diameter of the pipeline to be measured and smaller than the end joint diameter of the pipeline to be measured.

[0012] As a preferred technical solution, an elastic pressing piece that can move relative to it is provided on the clamping block provided with the clamping groove, and the elastic pressing piece is used to fit with the joint of the pipeline to be measured; a plurality of positioning baffles are provided on the elastic pressing piece, and the positioning baffles are concentrically arranged. Among them, when the elastic pressing piece is pressed, it drives the positioning baffles to converge and diverge relative to the center of the circle.

[0013] As a preferred technical solution, the arc length formed after the convergence of several positioning baffles exceeds half of its circumference length.

[0014] As a preferred technical solution, a clamping groove is provided on the elastic pressing piece, and the positioning baffle is provided with a rotating shaft and a clamping block. The rotating shaft is movably fixed in the clamping block, and the clamping block moves in the clamping groove around the rotating shaft.

[0015] As a preferred technical solution, the air inlet pipe can be telescopic and is used to connect or disconnect from the end joint of the pipeline to be measured on the clamping groove.

[0016] Advantages of the present invention:

[0017] The clamping members of the positive pressure waterproof sealing performance detection device for urban gas pipelines of the present invention can approach or move away from each other under the control of the moving assembly. When approaching, the operator can place the pipeline to be measured in the clamping groove of the clamping member with only one hand operation at a time, and then through the mutual separation of the clamping members, finally make the end joint of the pipeline to be measured be snap-connected to the wall surface of the clamping block in a fitting manner, so that the joint of the pipeline to be measured, that is, the gas pipeline, is aligned with the air inlet pipe, thereby realizing the docking of the air inlet pipe and the pipeline to be measured. During one detection process, the operator only needs to use one hand to complete the sealing performance detection of the pipeline to be measured through one put and one take. Compared with the prior art, the operation process of the operator is greatly simplified and the operation efficiency is improved. Description of the drawings

[0018] Figure 1 Schematic three-dimensional diagram of the positive pressure waterproof and airtight detection equipment for urban gas pipelines according to the present invention;

[0019] Figure 2 is Figure 1 partial enlarged schematic diagram of A in

[0020] Figure 3 Schematic diagram of another clamping groove;

[0021] Figure 4 Schematic three-dimensional diagram of another positive pressure waterproof and airtight detection equipment for urban gas pipelines according to the present invention;

[0022] Figure 5 is Figure 4 schematic diagram of the clamping member with a centering function in

[0023] Figure 6 schematic diagram of the elastic pressing piece and the positioning baffle for centering;

[0024] Figure 7 schematic diagram of the clamping block for installing the centering structure;

[0025] Figure 8 Schematic diagram of the cooperation between the centering structure in the aggregated state and the joint.

[0026] The reference signs and components involved in the drawings are as follows:

[0027] 1. Control cabinet;

[0028] 2. Operating table; 21. Sliding guide rail; 22. Carrier base;

[0029] 3. Inlet pipe;

[0030] 4. Pipeline to be tested; 41. Joint;

[0031] 5. Clamping member; 51. Moving component; 52. Clamping groove; 53. Clamping block;

[0032] 6. Elastic pressing piece; 61. Card slot;

[0033] 7. Positioning baffle; 71. Arc plate; 72. Connecting arm; 73. Block; 721. Rotating shaft. Detailed implementation manners

[0034] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0035] Embodiment 1

[0036] To better understand a positive pressure waterproof and airtightness detection device for urban gas pipelines provided in this embodiment, the following first briefly introduces the existing gas pipeline airtightness detection devices. The existing gas pipeline waterproof and leak-proof detection devices usually consist of a control cabinet and an operating table. The control cabinet integrates software and hardware such as a power supply, an air pump, a control system, a display system, and a pressure monitoring system. On the surface of the operating table, several pairs of fixed devices are provided. The fixed device is provided with an air inlet pipe connected to the air pump of the control cabinet through a pipeline, and a clamping groove opposite to the air inlet pipe. The clamping groove is a semi-circular ring structure for clamping the pipe wall of the gas pipeline. When in use, the operator needs to manually hold one end of the joint of the gas pipeline and manually clamp it in the clamping groove, start the hydraulic device that can control the telescopic movement of the air inlet pipe, so that the air inlet pipe extends towards the joint position of the gas pipeline until it abuts against the joint. The pipe orifice of the air inlet pipe is in sealed contact with the joint. Moreover, if it is loosened before docking, the pipeline to be tested is likely to shift under its own elastic force, resulting in subsequent failure to dock. At this time, it has to be re-docked. Therefore, generally, it is necessary to ensure that one end is successfully connected before connecting the joint at the other end of the gas pipeline. After injecting gas at a specific pressure into the gas pipeline through the program control of the control cabinet, when the pressure reaches the preset value, it is maintained and the pressure change in the gas pipeline is recorded. If the pressure does not change or the change is within the error range within a certain period of time, the airtightness is good; otherwise, the product is unqualified, and then the tested gas pipeline is removed. Obviously, during the detection, it is necessary to first manually align one end of the gas pipeline with the air inlet pipe until the air inlet pipe is joined to the gas pipeline, and then fix the other end of the gas pipeline. Therefore, during the test, at least two manual operations are required and the next operation must wait until the previous operation is completed. To solve the problem of the complicated operation steps described above, the following positive pressure waterproof and airtightness detection device for urban gas pipelines is provided in this embodiment.

[0037] Please refer to the attached Figure 1 、attached Figure 2 , Figure 1 is a three-dimensional schematic diagram of the positive pressure waterproof and airtightness detection device for urban gas pipelines described in the present invention. Figure 2 is Figure 1Schematic diagram of partial enlargement of A; A positive pressure waterproof sealing detection device for urban gas pipelines. For the convenience of equipment management and layout, in this embodiment, a control cabinet 1 and an operating platform 2 integrating an air pump, a pressure monitor, a control display system, etc. are also provided. Specifically, a sliding guide rail 21 is provided on the operating platform 2, and a carrier base 22 that can slide along it is mounted on the sliding guide rail 21. In this embodiment, four groups of the carrier bases 22 are provided in sequence. Inlet pipes 3 that are directly opposite are provided on the carrier bases 22 at both ends. Further, the pipe orifice of the inlet pipe 3 is adapted to the connection part of the pipeline 4 to be measured. Clamping members 5 are provided on the two carrier bases 22 in the middle. The clamping members 5 and the inlet pipes 3 at both ends are on the same straight line. In order to save space as much as possible and detect multiple pipelines 4 to be measured at the same time, multiple groups of the inlet pipes 3 and the clamping members 5 can be provided on each carrier base 22. Among them, a sealing ring is provided at the pipe orifice at one end of the inlet pipe 3, and the pipe wall of the inlet pipe 3 is connected to the air pump placed in the control cabinet 1 through a hose (not shown in the figure) to pressurize and ventilate the pipeline 4 to be measured through the inlet pipe 3. The other end of the inlet pipe 3 is connected to the telescopic rod of the hydraulic cylinder; In order to simplify the operation of installing the pipeline 4 to be measured, the clamping member 5 includes a moving component 51 and a clamping groove 52. In this embodiment, the clamping groove 52 is a U-shaped groove structure provided on the clamping block 53. In order to further facilitate the pipeline 4 to be measured to enter the groove, a V-shaped expansion port is provided at the notch of the U-shaped groove. In some embodiments, please refer to the appendix Figure 3 , Figure 3 For another schematic diagram of the clamping groove, the bottom of the U-shaped groove of the clamping groove 52 is a circular groove adapted to the pipe body of the pipeline 4 to be measured. Among them, the channel for entering the circular groove is slightly smaller than the pipe diameter, and the clamping blocks 53 on both sides of the channel are elastic, and the pipe body can be stably placed in the circular groove by pressing, and an upward force is required to take out the pipe body from the channel; The clamping blocks 53 are installed on the corresponding carrier bases 22. In order to drive the clamping grooves 52 to move synchronously, the moving component 51 is arranged at the bottom of the two middle carrier bases 22. Specifically, in this embodiment, the moving component 51 is a screw rod transmission, and a screw rod with a double thread is used in this embodiment, which is driven by a motor (not shown in the figure), and the two carrier bases 22 can be driven to move away from or close to each other. In order to facilitate the alignment between the inlet pipe 3 and the gas pipeline, the groove diameter of the clamping groove 52 is the same as the outer diameter of the pipeline 4 to be measured.

[0038] Usage method of the present invention: In the initial state, the inlet pipe 3 is in a retracted state, and the distance between the two middle carrier bases 22 is relatively close, such as Figure 4At the positions shown, and located on the threads with opposite helix directions on the screw. When installing the pipeline to be tested 4, i.e., the gas pipeline, the operator only needs to hold the pipe body of the gas pipeline and place the pipe body between the two connectors 41 of the gas pipeline at the bottom of the clamping groove 52. The distance between the two clamping blocks 53 is greater than the operator's hand, so that the operator can press the gas pipeline into the clamping grooves 52 on both sides with one hand. After installing the gas pipeline into the clamping grooves 52 on the operation table 2 in sequence, driven by the moving component 51, the two clamping grooves 52 on the gas pipeline move in opposite directions, and the moving distance of the clamping groove 52 is the same as the length of the gas pipeline. After the moving component 51 moves a corresponding distance, the rear walls of the connectors 41 at both ends of the gas pipeline are attached to the wall surfaces of the corresponding clamping blocks 53. At this time, there is a gap between the connector 41 of the gas pipeline and the intake pipe 3 in the retracted state. The intake pipe 3 is connected into the connector 41 of the gas pipeline through the hydraulic telescopic rod, and then the airtightness detection test is carried out. The intake pipe 3 at one end can be used to introduce gas, and the sensor of the pressure monitor is arranged in the intake pipe 3 at the other end to monitor the pressure in the pipeline to be tested 4. By introducing gas and increasing pressure, maintaining pressure, and monitoring pressure in sequence, it is judged whether the pressure in the gas pipeline during the pressure maintaining stage drops to determine whether the airtightness of the gas pipeline to be tested is qualified. The pressure test process is the prior art. After the airtightness detection is completed, the middle two carrier bases 22 are moved closer to the initial state by the moving component 51 for the next round of detection.

[0039] In this embodiment, the two clamping members 5 of the positive pressure waterproof airtightness detection device for urban gas pipelines according to the present invention can approach or move away from each other under the control of the moving component 51. When approaching, the operator can place the pipeline to be tested 4 into the clamping grooves 52 of the two clamping members 5 with only one hand operation at a time, and then through the mutual separation of the clamping members 5, the end connector 41 of the pipeline to be tested 4 is fitted and clamped on the wall surface of the clamping block 53. At this time, the intake pipe 3 opposite to the clamping groove 52 of the connector 41 is directly opposite, and the direct connection between the intake pipe 3 and the pipeline to be tested 4 can be realized. It should be understood that the wall surface of the connector 41 of the pipeline to be tested 4 that fits the clamping block 53 is adapted. For example, the connector 41 of the gas pipeline is a nut structure, and the wall surface of the clamping block 53 is also a plane similar to the surface of the nut. The diameter of the groove of the clamping groove 52 is smaller than the diameter of the connector 41 of the gas pipeline, so that the nut can be clamped by the clamping block 53, thereby realizing a stable connection with the intake pipe 3.

[0040] When the operator uses the positive pressure waterproof airtightness detection device for urban gas pipelines according to the present invention to perform the airtightness detection operation, only one hand is needed to complete the airtightness detection of the pipeline to be tested 4 by putting and taking once. Compared with the prior art, the operation process of the operator is simplified.

[0041] One of the implementation manners is shown in the above embodiments. The bidirectional moving away from and approaching are realized through the synchronous movement of two sets of clamping members 5, reducing the working stroke of the moving component 51. However, in some implementation manners, one set of clamping members 5 is fixed, and the other set of clamping members 5 is provided with a moving component 51 to drive it to move away from or approach the other fixed clamping member 5, which can also realize the combing and fixing of the pipeline 4 to be measured.

[0042] Furthermore, in the above embodiments, a plurality of mounting blocks 53 of the clamping members 5 are arranged on the same carrier base 22 and share a moving component 51. It is necessary to place all the pipelines 4 to be measured first, and then start the moving component 51 to drive the mounting grooves 52 on the carrier base 22 to move together. Preferably, in some implementation manners, an independently movable carrier base 22 can be designed for the clamping members 5. Furthermore, a moving component 51 can also be directly arranged on the mounting block 53, and the moving components 51 of the clamping members 5 operate independently. At this time, after placing one of the pipelines 4 to be measured, the docking test can be started. During the test of the previous gas pipeline, another pipeline 4 to be measured can be installed, relatively improving the working efficiency.

[0043] It should be noted that: the moving component 51 can also be controlled by a hydraulic telescopic rod for expansion and contraction. The control system of the control cabinet 1 can also set the moving distance of the moving component 51. The relative positions of the components on the sliding guide rail 21 can also be adjusted and fixed according to actual needs to adapt to the measurement of pipelines 4 to be measured with different lengths. The control methods include monitoring the gas pressure in the pipeline 4 to be measured through a pressure monitor, which are all prior arts.

[0044] In this embodiment, the intake pipe 3 can be telescopic. The retracted intake pipe 3 can ensure that the pipeline 4 to be measured, that is, the gas pipeline, is straightened and aligned by the clamping members 5 before docking. And in some embodiments, it is also possible that during the movement of the clamping members 5, the intake pipe 3 contacts the gas pipeline joint 41, and after the movement of the clamping members 5 is completed, the intake pipe 3 and the joint 41 are simultaneously connected.

[0045] Embodiment 2

[0046] In the above embodiments, in order to make the intake pipe 3 directly face the interface of the pipeline 4 to be measured after the mounting groove 52 moves, the diameter of the mounting groove 52 is set to be the same as the pipe diameter of the pipeline 4 to be measured, so that the pipeline 4 to be measured can be straightened and the pipeline 4 to be measured will not shift. However, the operator needs to press the pipeline 4 to be measured to the bottom of the mounting groove 52 to make it embed therein, so that the operator needs to apply an additional force to install or remove the pipeline 4 to be measured during operation.

[0047] Therefore, in order to further reduce the working burden of the operator, in this embodiment, a positive pressure waterproof sealing detection device for urban gas pipelines is provided, which can automatically center the pipeline 4 to be measured and align it with the air inlet pipe 3 after the clamping member 5 moves. Please refer to the appendix Figure 4 , Figure 4 FIG. Figure 4 is a perspective view of another positive pressure waterproof sealing detection device for urban gas pipelines of the present invention. Specifically, in this embodiment, the diameter of the clamping groove 52 and the diameter of the channel for the pipe body to pass through are larger than the diameter of the pipe body to be measured, but smaller than the diameter of the end joint 41 of the pipeline 4 to be measured, so that the pipeline 4 to be measured can be placed in the clamping groove 52 without applying additional pressure. Please refer to the appendix Figure 5 , Figure 5 is Figure 4 a schematic diagram of the clamping member with a centering function. An elastic pressing piece 6 is provided on the clamping block 53. The elastic pressing piece 6 is arranged around the position of the pipeline 4 to be measured clamped by the clamping groove 52, is connected to the clamping block 53 through a spring structure, and a telescopic sleeve rod is movably sleeved in the spring for moving and limiting.

[0048] Please refer to the appendix Figure 6 , appendix Figure 7 , Figure 6 is a schematic diagram of the elastic pressing piece and the positioning baffle for centering. Figure 7Schematic diagram of a clamping block for installing a centering positioning structure; several positioning baffles 7 are provided on the elastic pressing piece 6, and the positioning baffles 7 are concentrically arranged. Among them, the elastic pressing piece 6 drives the positioning baffles 7 to converge and diverge relative to the center of the circle. In the converged state, the positioning baffles 7 are combined into an unclosed ring, and the inner diameter of the ring is the same as the diameter of the circumscribed circle of the joint 41 of the pipeline 4 to be measured. In the diverged state, the inner diameter of the inner circle formed by the positioning baffles 7 is greater than the diameter of the circumscribed circle of the joint 41 of the pipeline 4 to be measured; when the elastic pressing piece 6 approaches the plane where it is connected to the clamping block 53, the positioning baffles 7 gradually converge, and when the elastic pressing piece 6 moves away from the plane where it is connected to the clamping block 53, the positioning baffles 7 gradually diverge. Specifically, the positioning baffle 7 is provided with an arc-shaped plate 71 for forming a ring, and the arc-shaped plate 71 is connected to a clamping block 73 through a U-shaped connecting arm 72. A rotating shaft 721 is provided on the connecting arm 72; a suitable circular groove 61 is provided on the elastic pressing piece 6, and the clamping block 73 is installed in the groove 61. Among them, the pipeline 4 to be measured installed in the clamping groove 52 and centered, the groove 61, and the positioning baffle 7 all surround the same center of the circle. The diameter of the circumscribed circle of the joint 41 of the pipeline 4 to be measured is smaller than the diameter of the elastic pressing piece 6, that is, the joint 41 always contacts only the elastic pressing piece 6; the rotating shaft 721 is arranged in the clamping block 53, and the clamping block 73 can rotate in the groove 61, and the inner groove wall of the groove 61 is in contact with the outer wall of the clamping block 73. When the elastic pressing piece 6 is pressed or rebounds, the clamping block 73 is driven to rotate around the rotating shaft 721 through the groove 61, and then the arc-shaped plate 71 at the other end of the U-shaped connecting arm 72 is driven to approach or move away from the center of the circle. Further, due to the structure of the arc-shaped plate 71, it forms a ring structure with other arc-shaped plates 71, so that the position of the joint 41 such as a hexagonal nut inscribed in a circle with a corresponding diameter can be adjusted.

[0049] Its usage method is based on Example 1. Since the groove diameter of the clamping groove 52 is larger than the pipe diameter of the pipeline 4 to be measured, the operator can directly place the pipe body of the pipeline 4 to be measured in the clamping groove 52 without providing additional pressure. At this time, the pipe body can slide radially relative to the clamping groove 52. When the joints 41 on both sides of the pipeline 4 to be measured, that is, the gas pipeline, contact the elastic pressing pieces 6 on the clamping blocks 53 on both sides, the moving assembly 51 continues to move, compresses the elastic pressing pieces 6 at both ends, drives the positioning baffles 7 to converge, and makes the arc-shaped plates 71 on the positioning baffles 7 form a ring structure facing the intake pipe 3. Please refer to the appendix Figure 8 , Figure 8Schematic diagram of the centering structure in the aggregated state cooperating with the joint. During the mating process, the inner wall of the arc-shaped plate 71 contacts the joint 41 of the gas pipe, and the area of the first contact is pushed towards the center. Eventually, the positioning baffle 7 clamps the joint 41 of the pipeline 4 to be measured in the center. This solves the problem of automatic centering of the pipeline 4 to be measured and further reduces the workload of the operator. Preferably, the arc length of the circle formed by aggregating several said positioning baffles 7 is greater than half the circumference, and it can also play a role in clamping.

[0050] It should be noted that: since the intake pipe 3 abuts against the pipeline 4 to be measured on the clamping member 5 through components such as telescopic rods, in order to maintain good sealing between the two, there will be action and reaction forces between the intake pipe 3 and the clamping member 5. In this embodiment, since the elastic pressing piece 6 and the clamping block 53 are connected by a spring, when the intake pipe 3 presses the joint 41 on the clamping member 5, the spring structure can provide buffering, avoiding direct rigid action between the intake pipe 3 and the clamping member 5, reducing the pressure on the moving component 51, and reducing the possibility of damaging the corresponding structure. At the same time, the elastic force provided by the spring can assist in the sealing of the joint, keeping it in good sealing effect.

[0051] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention.

Claims

1. A positive pressure waterproof and airtightness detection device for urban gas pipelines, comprising a clamping member, an air inlet pipe, and a pressure monitor. The clamping member is used for clamping the pipeline to be tested; the air inlet pipe is used for communicating with the pipeline to be tested, and an air pump can introduce gas with a certain pressure into the pipeline to be tested through the air inlet pipe; the pressure monitor is used for detecting and recording the pressure change in the pipeline to be tested; characterized in that, The intake pipe and the clamping member are on the same straight line. The clamping member includes a moving component and a clamping groove. The clamping groove is used to clamp the pipe body between the end joints of the pipe to be measured. Among them, the groove diameter of the clamping groove is not less than the pipe body diameter of the pipe to be measured and not greater than the end joint diameter of the pipe to be measured. The moving component is used to drive the clamping groove to move towards the intake pipe. The clamping groove is a U-shaped groove. An elastic pressing piece that can move relative to it is provided on the clamping block provided with the clamping groove. The elastic pressing piece is used to fit with the joint of the pipe to be measured. A number of positioning baffles are provided on the elastic pressing piece, and the positioning baffles are concentrically arranged. Among them, when the elastic pressing piece is pressed, it drives the positioning baffles to converge and diverge relative to the center of the circle.

2. The positive pressure waterproof and airtight detection device for urban gas pipelines according to claim 1, characterized in that, A V-shaped expansion opening is provided at the notch of the clamping groove.

3. The positive pressure waterproof and airtightness detection device for urban gas pipelines according to claim 1, wherein, There are two sets of the clamping members, and the moving components respectively and simultaneously drive the two sets of opposite clamping members to move away from or close to each other.

4. The positive pressure waterproof and airtightness detection device for urban gas pipelines according to claim 3, wherein, The moving component includes a screw rod. Among them, two sections of threads with opposite helix directions are provided on the screw rod, and each clamping member is respectively arranged on the two sections of threads with opposite helix directions.

5. The positive pressure waterproof and airtight detection device for urban gas pipelines according to claim 1, characterized in that, The groove diameter of the clamping groove is greater than the pipe body diameter of the pipe to be measured and less than the end joint diameter of the pipe to be measured.

6. The positive pressure waterproof and airtightness detection device for urban gas pipelines according to claim 1, wherein, The arc length formed after the aggregation of a number of the positioning baffles exceeds half of its circumference length.

7. The positive pressure waterproof and airtightness detection device for urban gas pipelines according to claim 1, characterized in that, A clamping groove is provided on the elastic pressing piece. The positioning baffle is provided with a rotating shaft and a clamping block. The rotating shaft is movably fixed in the clamping block, and the clamping block moves in the clamping groove around the rotating shaft.

8. The positive pressure waterproof and airtight detection device for urban gas pipelines according to claim 1, characterized in that, The intake pipe can be telescopic and is used to connect or disconnect from the end joint of the pipe to be measured on the clamping groove.

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