Positive pressure waterproof sealing performance detection equipment for urban gas pipeline

Abstract

The invention relates to the technical field of gas pipeline sealing performance testing, and discloses urban gas pipeline positive pressure waterproof sealing performance detection equipment, which comprises a clamping piece, a gas inlet pipe and a pressure monitor, and is characterized in that the clamping piece is used for clamping a to-be-detected pipeline; the air inlet pipe is used for being communicated with a to-be-detected pipeline, and an air pump can introduce gas with certain pressure into the to-be-detected pipeline through the air inlet pipe; the pressure monitor is used for detecting and recording the pressure change in the to-be-detected pipeline; the clamping piece comprises a moving assembly and a clamping groove, the groove diameter of the clamping groove is not smaller than the pipe body diameter of the to-be-detected pipeline and not larger than the end connector diameter of the to-be-detected pipeline, and the moving assembly is used for achieving relative movement of the clamping groove and the gas pipe. The device has the advantages that the operation steps of operators can be simplified, the detection process can be optimized, and the overall detection efficiency can be improved when the sealing performance of the gas pipe is detected.

Description

Technical Field

[0001] The invention relates to the technical field of gas pipeline sealing performance testing, and in particular to a positive pressure waterproof sealing performance testing device for a city gas pipeline. Background Art

[0002] In cities, there are many residences and a large amount of gas consumption. There are relatively many gas pipelines connected to users, and the water vapor content in the kitchen is relatively high, so the gas pipes need to have high waterproof sealing properties. Existing gas appliances are usually connected with corrugated hoses, which are usually composed of stainless steel bellows, PVC outer protective layer and joints at both ends. When the gas pipe leaves the factory, in order to ensure its waterproof sealing, it needs to be tested for sealing using an air tightness tester. In the standard for sealing testing, the hose must be tested at least at 0.5Mpa air pressure, and the pressure must be maintained for 1 minute, and there should be no leakage.

[0003] Before leaving the factory, each gas pipeline needs to be tested for tightness. During the test, the joints at both ends of the gas pipe need to be aligned with the joints of the gas pump in turn to avoid irregular connections between the gas pump and the gas pipe, which will 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 operating steps of operators, optimize the detection process, and improve the overall detection efficiency during the sealing detection of the gas pipe. Summary of the invention

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

[0006] In order to solve the above problems, the technical solution of the present invention is: A positive pressure waterproof sealing detection device for urban gas pipelines, comprising a clamping member, an air inlet pipe, and a pressure monitor, wherein the clamping member is used to clamp the pipeline to be tested; the air inlet pipe is used to be connected to the pipeline to be tested, and an air pump can pass gas of a certain pressure into the pipeline to be tested through the air inlet pipe; the pressure monitor is used to detect and record the pressure changes in the pipeline to be tested; the air inlet pipe and the clamping member are located on the same straight line, and the clamping member comprises a moving component and a clamping groove, and the clamping groove is used to clamp the pipe body between the two end joints of the pipeline to be tested, wherein 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, and the moving component is used to drive the clamping groove to move toward the air inlet pipe.

[0007] As a preferred technical solution, the clamping groove is a U-shaped groove, and the groove opening is provided with a V-shaped expansion opening.

[0008] As a preferred technical solution, two groups of the clamping members are provided, and the moving assembly drives the two groups of relative clamping members to move away from or closer to each other at the same time.

[0009] As a preferred technical solution, the moving assembly includes a screw rod, wherein the screw rod is provided with two sections of threads with opposite rotation directions, and each of the clamping members is respectively arranged on the two sections of threads with opposite rotation directions.

[0010] As a preferred technical solution, the diameter of the clamping groove is larger than the diameter of the pipe body of the pipe to be tested, and smaller than the diameter of the end joint of the pipe to be tested.

[0011] As a preferred technical solution, the clamping block provided with the clamping groove is provided with an elastic pressing plate that can move relative to it, and the elastic pressing plate is used to fit with the joint of the pipeline to be tested; a plurality of positioning baffles are provided on the elastic pressing plate, and each of the positioning baffles is concentrically arranged, wherein the elastic pressing plate is pressed to drive the positioning baffles to converge and diffuse relative to the center of the circle.

[0012] As a preferred technical solution, the length of the arc formed by the aggregation of a plurality of the positioning baffles exceeds half of their circumference.

[0013] As a preferred technical solution, the elastic pressing plate is provided with a card slot, the positioning baffle is provided with a rotating shaft and a card block, the rotating shaft is movably fixed in the clamping block, and the card block moves around the rotating shaft in the card slot.

[0014] As a preferred technical solution, the air inlet pipe can be retracted to be connected to or disconnected from the end joint of the pipeline to be tested on the clamping groove.

[0015] Beneficial effects of the present invention: The clamping parts of the urban gas pipeline positive pressure waterproof sealing detection equipment described in the present invention can approach or move away from each other under the control of the moving component. When approaching, the operator can place the pipeline to be tested in the clamping groove of the clamping parts by one hand at a time, and then by moving the clamping parts away from each other, the end joint of the pipeline to be tested is finally snap-fitted onto the wall surface of the clamping block, so that the joint of the pipeline to be tested, i.e., the gas pipe, is directly opposite to the air intake pipe, thereby realizing the docking of the air intake pipe with the pipeline to be tested. In one detection process, the operator only needs to use one hand to complete the sealing detection of the pipeline to be tested by placing and picking up. Compared with the prior art, the operation process of the operator is greatly simplified and the operation efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a three-dimensional schematic diagram of the positive pressure waterproof sealing detection equipment for city gas pipelines according to the present invention; Figure 2 for Figure 1 Middle A is a partial enlarged schematic diagram; Figure 3 It is a schematic diagram of another clamping slot; Figure 4 It is a three-dimensional schematic diagram of another positive pressure waterproof sealing detection device for city gas pipelines of the present invention; Figure 5 for Figure 4 Schematic diagram of the clamping part with center positioning function; Figure 6 A schematic diagram of an elastic pressing sheet and a positioning baffle for centering; Figure 7 A schematic diagram of a clamping block for installing a centering positioning structure; Figure 8 It is a schematic diagram of the coordination between the center positioning structure and the joint in the aggregated state.

[0017] The reference numerals and components involved in the drawings are as follows: 1. Control cabinet; 2. Operating table; 21. Sliding guide rail; 22. Carrier base; 3. Intake pipe; 4. Pipeline to be tested; 41. Joint; 5. Clamping member; 51. Moving assembly; 52. Clamping slot; 53. Clamping block; 6. Elastic pressing sheet; 61. Card slot; 7. Positioning baffle; 71. Arc plate; 72. Connecting arm; 73. Block; 721. Rotating shaft. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1 In order to better understand the positive pressure waterproof sealing detection equipment for urban gas pipelines provided by the present embodiment, the following first briefly introduces the existing gas pipeline sealing detection equipment. The existing gas pipeline waterproof and leakproof sealing detection equipment is usually composed 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. A plurality of pairs of fixing devices are arranged on the table top of the operating table. The fixing 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 semicircular ring structure for clamping the pipe wall of the gas pipe. When in use, the operator needs to hold one end of the joint of the gas pipe by hand and manually clamp it in In the clamping groove, start the hydraulic device that can control the extension and retraction of the air intake pipe, so that the air intake pipe extends to the joint position of the gas pipe until it abuts the joint. The pipe mouth of the air intake pipe is sealed and abutted against the joint. If it is loosened before docking, the pipeline to be tested is easy to shift under the action of its own elastic force, resulting in subsequent docking failure. At this time, it has to be re-docking. Therefore, it is generally necessary to ensure that one end is connected successfully before connecting the joint at the other end of the gas pipe. After injecting gas of a specific pressure into the gas pipe through the program control of the control cabinet, the pressure change in the gas pipe is maintained and recorded after the pressure reaches the preset value. If the pressure does not change within a certain period of time or the change is within the error range, the air tightness is good. Otherwise, the product is unqualified and the gas pipe to be tested is removed. It is obvious that during the test, it is necessary to manually align one end of the gas pipe with the air inlet pipe until the air inlet pipe is connected to the gas pipe, and then fix the other end of the gas pipe. Therefore, during the test, at least two manual operations are required and the next operation can only be performed after the previous operation is completed. In order to solve the problem of complicated operating steps mentioned above, this embodiment provides the urban gas pipeline positive pressure waterproof sealing detection equipment described below.

[0020] Please see attached Figure 1 , Attachment Figure 2 , Figure 1 This is a three-dimensional schematic diagram of the positive pressure waterproof sealing detection equipment for urban gas pipelines according to the present invention. Figure 2 for Figure 1A partial enlarged schematic diagram in the middle; a positive pressure waterproof sealing detection device for urban gas pipelines. In order to facilitate the management and layout of the equipment, a control cabinet 1 and an operating table 2 which integrate an air pump, a pressure monitor, a control display system, etc. are also provided in this embodiment. Specifically, a sliding guide rail 21 is provided on the operating table 2, and a carrier base 22 which can slide along the sliding guide rail 21 is mounted on the sliding guide rail 21. In this embodiment, the carrier base 22 is provided with four groups in sequence, and the carrier bases 22 at both ends are provided with opposite air inlet pipes 3. Furthermore, the pipe openings of the air inlet pipes 3 are adapted to the connecting parts of the pipeline 4 to be tested, and the two middle carrier bases 22 are provided with clamping members 5. The clamping members 5 and the air inlet pipes 3 at both ends are located on the same straight line. In order to save space as much as possible, To detect multiple pipelines 4 to be tested at the same time, multiple groups of the air intake pipes 3 and clamps 5 can be set on each carrier base 22, wherein a sealing ring is provided at the pipe mouth of one end of the air intake pipe 3, and the pipe wall of the air intake pipe 3 is connected to an 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 tested through the air intake pipe 3, and the other end of the air intake pipe 3 is connected to the telescopic rod of the hydraulic cylinder; in order to simplify the operation when installing the pipeline 4 to be tested, the clamp 5 includes a moving component 51 and a clamping groove 52. In this embodiment, the clamping groove 52 is a U-shaped groove structure set on the clamping block 53. In order to further facilitate the pipeline 4 to be tested to enter the groove, the notch of the U-shaped groove is also provided with a V-shaped expansion opening. In some embodiments, please refer to the attached Figure 3 , Figure 3 Schematic diagram of another clamping groove, the bottom of the U-shaped groove of the clamping groove 52 is a circular groove adapted to the tube body of the pipe 4 to be tested, wherein the channel entering the circular groove is slightly smaller than the diameter of the tube body and the clamping blocks 53 on both sides of the channel are elastic, and the tube body can be stabilized in the circular groove by pressing, and an upward force is required to remove the tube body from the channel; the clamping blocks 53 are installed on the corresponding carrier base 22, and in order to drive the synchronous movement of each of the clamping grooves 52, the moving assembly 51 is arranged at the bottom of the two middle groups of carrier bases 22. Specifically, in this embodiment, the moving assembly 51 is a threaded screw drive, and a screw with a bidirectional thread is used in this embodiment, which is driven by a motor (not shown in the figure), so as to drive the two carrier bases 22 to move away from or close to each other. In order to facilitate the alignment between the air intake pipe 3 and the gas pipe, the groove diameter of the clamping groove 52 is the same as the outer diameter of the pipe of the pipe 4 to be tested.

[0021] In the initial state, the air inlet pipe 3 is in a retracted state, and the distance between the two sets of carrier bases 22 in the middle is relatively close. Figure 4The positions shown in the figure are respectively located on the threads on the screw rod that rotate in opposite directions. When installing the pipeline 4 to be tested, i.e., the gas pipe, it is only necessary to hold the pipe body of the gas pipe and place the pipe body between the joints 41 at both ends of the gas pipe to the bottom of the clamping groove 52. The distance between the two clamping blocks 53 is larger than the operator's hand, so that the operator can press the gas pipe into the clamping grooves 52 on both sides with one hand. After the gas pipes are installed in the clamping grooves 52 on the operating table 2 in turn, the two clamping grooves 52 on the gas pipe move in opposite directions under the drive of the moving component 51. The moving distance of the clamping grooves 52 is the same as the length of the gas pipe, so that after the moving component 51 moves a corresponding distance, the rear walls of the joints 41 at both ends of the gas pipe are aligned with the corresponding clamping grooves. The wall surface of the clamping block 53 is fitted. At this time, there is a gap between the joint 41 of the gas pipe and the intake pipe 3 in the retracted state. The intake pipe 3 is connected to the joint 41 of the gas pipe through the hydraulic telescopic rod, and then a sealing test is performed. The intake pipe 3 at one end can be used to intake air, and a sensor of a pressure monitor is set in the intake pipe 3 at the other end to monitor the pressure in the pipeline 4 to be tested. Ventilation and pressurization, pressure maintenance, and pressure monitoring are performed in sequence. Whether the pressure in the gas pipe drops during the pressure maintenance stage is judged to judge whether the sealing of the gas pipe to be tested is qualified. The pressure testing process is the existing technology. After the sealing test is completed, the two middle groups of carrier bases 22 are moved to the initial state by moving the component 51 to wait for the next round of testing.

[0022] In this embodiment, the two clamping members 5 of the urban gas pipeline positive pressure waterproof sealing detection equipment described in 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 4 to be tested in the clamping groove 52 of the two clamping members 5 with only one hand, and then by moving the clamping members 5 away from each other, the end joint 41 of the pipeline 4 to be tested is fit-fitted and clamped on the wall surface of the clamping block 53. At this time, the joint 41 is directly opposite to the air intake pipe 3 opposite to the clamping groove 52, so that the air intake pipe 3 and the pipeline 4 to be tested can be directly connected. It should be understood that the joint 41 of the pipeline 4 to be tested is adapted to the wall surface of the clamping block 53. For example, the joint 41 of the gas pipe is a nut structure, and the wall surface of the clamping block 53 is also the same plane as the nut surface. The diameter of the clamping groove 52 is smaller than the diameter of the gas pipe joint 41, so that the nut can be clamped by the clamping block 53, thereby achieving a stable connection with the air intake pipe 3.

[0023] When the operator uses the urban gas pipeline positive pressure waterproof sealing detection equipment described in the present invention to perform sealing detection operations, he only needs to use one hand to complete the sealing detection of the pipeline 4 to be tested by placing and picking up. Compared with the existing technology, the operator's operating process is simplified.

[0024] The above embodiment shows one implementation method, which realizes bidirectional separation and approach through the synchronous movement of two groups of clamping members 5, reducing the working stroke of the moving component 51. However, in some implementation methods, one group of clamping members 5 is fixed, and the other group of clamping members 5 is provided with a moving component 51 to drive it away from or close to another fixed clamping member 5, which can also realize the combing and fixing of the pipeline 4 to be tested.

[0025] Furthermore, in the above embodiment, a plurality of clamping blocks 53 of the clamping members 5 are provided on the same carrier base 22, and a moving assembly 51 is shared. It is necessary to place all the pipelines 4 to be tested first, and then start the moving assembly 51 to drive the clamping grooves 52 on the carrier base 22 to move together. Preferably, in some embodiments, an independently movable carrier base 22 can be designed for the clamping members 5. Furthermore, the moving assembly 51 can be directly provided on the clamping block 53, and the moving assembly 51 of each clamping member 5 operates independently. At this time, the docking test can be started after placing one of the pipelines 4 to be tested, and another pipeline 4 to be tested can be installed during the test of the previous gas pipeline, thereby relatively improving the work efficiency.

[0026] It should be noted that: the moving component 51 can also be telescopically controlled by a hydraulic telescopic rod, the control system of the control cabinet 1 can also set the moving distance of the moving component 51, and 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 tested with different lengths. Its control method includes monitoring the gas pressure in the pipeline 4 to be tested through a pressure monitor, which are all existing technologies.

[0027] In this embodiment, the air intake pipe 3 can be retracted. The air intake pipe 3 in the retracted state can ensure that the pipeline 4 to be tested, i.e., the gas pipe, is straightened and aligned by the clamp 5 before docking. In some embodiments, the air intake pipe 3 can also be in contact with the gas pipe joint 41 during the movement of the clamp 5. After the clamp 5 has been moved, the air intake pipe 3 and the joint 41 are connected at the same time.

[0028] Example 2 In the above embodiment, in order to make the interface of the air inlet pipe 3 and the pipe to be tested 4 face each other after the clamping groove 52 is moved, the diameter of the clamping groove 52 is set to be consistent with the pipe body diameter of the pipe to be tested 4, so that the pipe to be tested 4 can be straightened so that the pipe to be tested 4 will not be offset. However, it is necessary for the operator to press the pipe to be tested 4 to the bottom of the clamping groove 52 to embed it therein, so that the operator needs to apply an additional force to install or remove the pipe to be tested 4 during operation.

[0029] Therefore, in order to further reduce the workload of the operator, this embodiment provides a city gas pipeline positive pressure waterproof tightness detection device that can automatically center the pipeline 4 to be tested and align it with the air inlet pipe 3 after the clamping member 5 moves. Figure 4 , Figure 4 1 is a three-dimensional schematic diagram 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 passage for the pipe body to pass through are larger than the diameter of the pipe body to be tested, but smaller than the diameter of the end joint 41 of the pipe 4 to be tested, so that the pipe 4 to be tested can be placed in the clamping groove 52 without applying additional pressure; see the attached Figure 5 , Figure 5 for Figure 4 The schematic diagram of the clamping piece with a centering positioning function is shown in the figure. The clamping block 53 is provided with an elastic pressing sheet 6. The elastic pressing sheet 6 is arranged around the position of the pipe to be tested 4 clamped by the clamping groove 52, and is connected to the clamping block 53 through a spring structure. A movable telescopic sleeve rod is provided in the spring for moving the limit.

[0030] Please see attached Figure 6 , Attachment Figure 7 , Figure 6 The schematic diagram of the elastic pressing piece and the positioning baffle for centering is shown in FIG. Figure 7Schematic diagram of a clamping block for installing a centering positioning structure; a plurality of positioning baffles 7 are provided on the elastic pressing sheet 6, and each of the positioning baffles 7 is concentrically arranged, wherein the elastic pressing sheet 6 drives the positioning baffles 7 to converge and diffuse relative to the center of the circle, and in the aggregated state, each of the positioning baffles 7 is combined into an unclosed circular ring, and the inner diameter of the circular ring is the same as the diameter of the circumscribed circle of the joint 41 of the pipe to be measured, and in the diffused state, the inner circle diameter surrounded by each of the positioning baffles 7 is larger than the diameter of the circumscribed circle of the joint 41 of the pipe to be measured; when the elastic pressing sheet 6 approaches the plane where it is connected to the clamping block 53, the positioning baffles 7 gradually converge, and when the elastic pressing sheet 6 is away from the plane where it is connected to the clamping block 53, the positioning baffles 7 gradually diffuse, specifically, an arc plate 71 for forming a circular ring is provided on the positioning baffle 7, and the arc plate 71 is connected to the clamping block 73 through a U-shaped connecting arm 72, and a rotating shaft 721 is provided on the connecting arm 72 ; The elastic pressing piece 6 is provided with an adaptive annular groove 61, and the groove 61 is used to install the clamping block 73, wherein the pipeline 4 to be tested, the groove 61, and the positioning baffle 7 installed in the clamping groove 52 and centered are all around the same center of a circle, and the diameter of the circumscribed circle of the joint 41 of the pipeline 4 to be tested is smaller than the diameter of the elastic pressing piece 6, that is, the joint 41 is always only in contact with 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 compressed or rebounded, the clamping block 73 is driven to rotate around the rotating shaft 721 through the groove 61, thereby driving the arc plate 71 at the other end of the U-shaped connecting arm 72 to approach or move away from the center of the circle. Furthermore, due to the structure of the arc plate 71, it forms a circular ring structure with other arc plates 71, so that it adjusts the position of the joint 41 such as the hexagonal nut inscribed in the circle of the corresponding diameter.

[0031] The method of use is as follows: on the basis of Example 1, since the groove diameter of the clamping groove 52 is larger than the tube body diameter of the pipeline 4 to be tested, the operator does not need to provide additional pressure to directly place the tube body of the pipeline 4 to be tested in the clamping groove 52. At this time, the tube body can radially slide relative to the clamping groove 52. When the joints 41 on both sides of the pipeline 4 to be tested, i.e., the gas pipe, contact the elastic pressing pieces 6 on the clamping blocks 53 on both sides, the moving component 51 continues to move, compressing the elastic pressing pieces 6 at both ends, driving the positioning baffle 7 to fit together, so that the arc plate 71 on the positioning baffle 7 forms a circular ring structure facing the air inlet pipe 3. Please refer to the attached Figure 8 , Figure 8The figure is a schematic diagram of the coordination between the centering positioning structure and the joint in the aggregated state. During the process of the coordination, the inner wall of the arc plate 71 contacts the joint 41 of the gas pipe, and the area that contacts first is pushed toward the center, so that the positioning baffle 7 can finally clamp the joint 41 of the pipeline 4 to be tested in the center. The problem of automatic centering of the pipeline 4 to be tested is solved, and the workload of the operator is further reduced. Preferably, the arc length of the circle formed by the aggregation of several positioning baffles 7 is greater than half the circumference, and can also play a clamping role.

[0032] It should be noted that: since the air intake pipe 3 is in contact with the pipe to be tested 4 on the clamp 5 through components such as a telescopic rod, in order to maintain a good seal between the two, there will be an action force and a reaction force between the air intake pipe 3 and the clamp 5. In this embodiment, since the elastic pressure sheet 6 and the clamping block 53 are connected by a spring, when the air intake pipe 3 and the joint 41 on the clamp 5 are pressed tightly, the spring structure can provide a buffer to avoid direct rigid force between the air intake pipe 3 and the clamp 5, reduce the pressure on the moving component 51, and reduce the possibility of damaging the corresponding structure. At the same time, the elastic force provided by the spring can assist the sealing of the joint to maintain a good sealing effect.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the principle of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A positive pressure waterproof sealing test device for a city gas pipeline, comprising a clamping member, an air inlet pipe, and a pressure monitor, wherein 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 pass 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; characterized in that: The air inlet pipe and the clamping member are located on the same straight line, and the clamping member includes a moving component and a clamping groove, and the clamping groove is used to clamp the pipe body between the two end joints of the pipe to be tested, wherein the groove diameter of the clamping groove is not less than the pipe body diameter of the pipe to be tested, and is not greater than the end joint diameter of the pipe to be tested, and the moving component is used to drive the clamping groove to move toward the air inlet pipe.

2. The positive pressure waterproof sealing detection equipment for urban gas pipelines according to claim 1 is characterized in that: The clamping groove is a U-shaped groove, and a V-shaped expansion opening is provided at the groove opening.

3. The positive pressure waterproof sealing detection equipment for urban gas pipelines according to claim 1 is characterized in that: Two groups of the clamping members are provided, and the moving assembly drives the two groups of relative clamping members to move away from or closer to each other at the same time.

4. The positive pressure waterproof sealing detection equipment for urban gas pipelines according to claim 3 is characterized in that: The moving assembly comprises a screw rod, wherein the screw rod is provided with two sections of threads with opposite rotation directions, and each of the clamping members is respectively arranged on the two sections of threads with opposite rotation directions.

5. The positive pressure waterproof sealing detection equipment for urban gas pipelines according to claim 1 is characterized in that: The diameter of the clamping groove is larger than the diameter of the pipe body of the pipe to be tested, and smaller than the diameter of the end joint of the pipe to be tested.

6. The positive pressure waterproof sealing detection equipment for urban gas pipelines according to claim 5 is characterized in that: The clamping block provided with the clamping groove is provided with an elastic pressing sheet that can move relative to it, and the elastic pressing sheet is used to fit with the joint of the pipeline to be tested; a plurality of positioning baffles are provided on the elastic pressing sheet, and each of the positioning baffles is concentrically arranged, wherein the elastic pressing sheet is pressed to drive the positioning baffles to converge and spread relative to the center of the circle.

7. The positive pressure waterproof sealing detection equipment for urban gas pipelines according to claim 6 is characterized in that: The arc length formed by a plurality of the positioning baffles after being aggregated exceeds half of the circumference thereof.

8. The positive pressure waterproof sealing detection equipment for urban gas pipelines according to claim 6 is characterized in that: The elastic pressing sheet is provided with a card slot, the positioning baffle is provided with a rotating shaft and a card block, the rotating shaft is movably fixed in the clamping block, and the card block moves around the rotating shaft in the card slot.

9. The positive pressure waterproof sealing detection equipment for urban gas pipelines according to claim 1 is characterized in that: The air inlet pipe can be extended and retracted to be connected to or disconnected from the end joint of the pipeline to be tested on the clamping groove.

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