A device for testing the sealing performance of pressure-bearing interfaces at the ends of water supply and drainage pipes.

Abstract

This invention discloses a device for testing the sealing performance of pressure-bearing interfaces at the ends of water supply and drainage pipes, belonging to the field of pipeline sealing performance testing technology. It includes a housing fitted onto the outside of the drainage pipe interface, with locking components at both ends for securing the housing, and a pump body mounted on the outside of the housing. A sealing bladder is embedded in the housing, and a partition is fixedly installed in the inner cavity of the housing, dividing the inner side of the housing into a liquid storage chamber and a negative pressure chamber. A sensor module for detecting air pressure is installed inside the negative pressure chamber. The housing also includes a pressure regulating component for adjusting the internal pressure of the sealing bladder, controlled by the air pressure inside the negative pressure chamber. This device for testing the sealing performance of pressure-bearing interfaces at the ends of water supply and drainage pipes can be conveniently and stably installed at the drainage pipe testing location, and can adaptively adjust the installation sealing performance according to pressure changes to ensure testing accuracy. It can also automatically mark the location of leaks.

Description

Technical Field

[0001] This invention relates to the field of pipeline sealing testing technology, specifically to a device for testing the sealing performance of pressure-bearing interfaces at the ends of water supply and drainage pipes. Background Technology

[0002] Flexible socket joints for water supply and drainage are key connection components of urban pipe network systems. Their sealing performance, durability, and reliability directly affect water supply safety. Due to technical deficiencies in high-pressure sealing, corrosion-resistant materials, and monitoring, existing technologies result in high leakage rates and short service lives in pipe networks. Therefore, during the research and development process, sealing testing equipment is needed to perform sealing tests on the pressure-bearing joints at the ends of drainage pipes.

[0003] The prior art (Chinese patent publication number: CN109655204B, published on 2020-12-04) discloses a pipe connection sealing performance testing structure, which includes a socket pipe and a spigot pipe. The spigot pipe is inserted into the socket pipe, and the inner diameters of the socket pipe and the spigot pipe are equal. An annular U-shaped groove is formed between the end of the spigot pipe and the inner wall of the socket pipe. The opening of the U-shaped groove faces the center of the socket pipe. A pressure plate is set at the position of the U-shaped groove. There are multiple pressure plates, which are arc-shaped. An annular sealing gasket is set between the pressure plate and the socket pipe. The sealing gasket closes the opening of the U-shaped groove. The sum of the arc radius of the pressure plate and the thickness of the sealing gasket is equal to the radius of the socket pipe. The multiple pressure plates are evenly distributed around the circumference of the socket pipe and form a circle. A sealing gasket is set inside the socket pipe. A support ring, the diameter of which is smaller than the diameter of the arc formed by the pressure plate, is provided with a screw on the support ring. The screw is threaded onto the support ring, and the end of the screw abuts against the pressure plate. It is placed inside the pipe for testing, reducing the connection complexity of the pipe interface. Prior art (Chinese patent publication number: CN114323454A, publication date: 2022-04-12) discloses a pipe sealing performance testing device, including a base plate. An adjustment mechanism is provided at the upper end of the base plate, and a clamping sealing mechanism is provided on the adjustment mechanism. A cleaning mechanism is provided at the top of the adjustment mechanism. An adjustable drive mechanism is provided on one upper side of the base plate to cooperate with the cleaning mechanism and the clamping sealing mechanism. An adjustable drive mechanism is provided on the other upper side of the base plate. A blower mechanism is provided to cooperate with the clamping and sealing mechanism; the first gear drives the first rotating drum to rotate through the gear ring and stretches the output end of the motor until both ends of the oil pipeline to be tested are respectively engaged in the two sets of sealing grooves and in close contact with the corresponding sealing gaskets, at which point the motor is turned off, thereby quickly clamping the oil pipeline to be tested between the first and second rotating drums, and ensuring the sealing of the connection between the oil pipeline to be tested and the first and second rotating drums, thus ensuring the accuracy of the oil pipeline sealing test results; the prior art (publication number: CN120702685A, Chinese patent published on 2025-09-26) discloses a pipeline sealing test device for construction engineering testing, including a base, on which a... The testing cylinder contains a first sealing component that is movably connected inside. The first sealing component seals the end of the pipe under test and clamps and fixes the pipe, driving it to move. A second sealing component is installed at the other end of the pipe. The second sealing component has air holes. After the first and second sealing components seal both ends of the pipe, air is injected into the pipe. A transmission assembly includes a horizontally arranged transmission rod driven by a motor. A second gear is slidably arranged on the transmission rod. Through the structure of the detection marking assembly, the location of sealing defects on the pipe surface is detected when the pipe passes underneath it, and this location is marked for subsequent pipe repair, avoiding the waste of the entire pipe.

[0004] While existing interface sealing testing equipment can perform sealing tests and marking, the testing process requires multiple different testing institutions to comprehensively determine leak points and mark them individually. Furthermore, it cannot adaptively adjust the assembly sealing between the equipment and pipelines according to changes in air pressure during the testing process, making it easy for leaks to occur between the equipment and pipelines, which affects the final test results, thus exhibiting certain usage defects. Summary of the Invention

[0005] The purpose of this invention is to provide a sealing test device for pressure-bearing interfaces of water supply and drainage pipes, in order to solve the problems mentioned in the background art. Although the current interface sealing test devices on the market can achieve sealing detection and marking, they require multiple different testing mechanisms to comprehensively determine the leak point and mark it individually. Furthermore, they cannot adaptively adjust the assembly sealing between the device and the pipeline according to changes in air pressure during the testing process, which makes it easy for leaks to occur between the device and the pipeline and affect the final test results.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A device for testing the sealing performance of a pressure-bearing interface of a water supply and drainage pipe includes a housing fitted around the outside of the drainage pipe interface. Locking components for locking the housing are located at both ends, and a pump body is located on the outside of the housing. A sealing bladder is embedded in the housing. A partition is fixedly installed in the inner cavity of the housing, dividing the inner side of the housing into a liquid storage chamber and a negative pressure chamber. A sensor module for detecting air pressure is located inside the negative pressure chamber. A pressure regulating component for adjusting the internal pressure of the sealing bladder is also provided on the housing, and the pressure regulating component is controlled and adjusted by the air pressure inside the negative pressure chamber. An elastic rubber component is fixedly installed in the inner ring of the partition, and a liquid delivery component for conveying marking pigment is installed at the lower end of the partition. A movable seat is symmetrically and elastically rotatably mounted inside the housing, and a spraying component is installed on the movable seat. A liquid delivery pipe for conveying pigment is connected between the spraying component and the elastic rubber component, and the elastic rubber component drives the movable seat to rotate elastically during expansion and deformation.

[0008] Preferably, the locking assembly includes connecting pipes symmetrically and integrally disposed on both sides of the housing, and the outer wall of the connecting pipe is provided with an external thread structure. An adjusting seat is threadedly connected to the outer side of the connecting pipe. An elastic clamp is uniformly fixedly connected to the end of the connecting pipe away from the housing. The side of the elastic clamp away from the drain pipe is set with an inclined surface. When the adjusting seat is away from the housing, it pushes the elastic clamp to rotate elastically and clamp it to the outer wall of the drain pipe.

[0009] Preferably, the pressure regulating assembly includes a first pressure regulating bladder embedded in the outer wall of the connecting pipe, and a portion of the first pressure regulating bladder protrudes from the outer wall of the connecting pipe. The first pressure regulating bladder is squeezed during the movement of the adjusting seat, and the first pressure regulating bladder and the sealing bladder are connected by a pipe.

[0010] Preferably, the sealing bladder is arranged in a circular structure, and two sealing bladders are symmetrically arranged about the shell. After the sealing bladder expands, it seals against the outer wall of the drain pipe, and the two sealing bladders are located on both sides of the drain pipe port.

[0011] Preferably, the partition and the elastic rubber part are bonded together, and the elastic rubber part is arranged in a circular ring structure. An air suction pipe is connected between the air intake end of the pump body and the negative pressure chamber. At the same time, the elastic rubber part deforms when the air pressure inside the negative pressure chamber decreases.

[0012] Preferably, the infusion assembly includes a suction tube and a pressure valve fixedly installed at the lower end of the partition, and the inner side of the storage chamber is filled with marking pigment, and the lower end of the suction tube is immersed in the marking pigment. When the elastic component deforms under negative pressure, the cavity between the partition and the elastic component draws out the marking pigment through the suction tube, and the suction tube is provided with a one-way valve structure.

[0013] Preferably, the infusion assembly further includes a solenoid valve fixedly mounted on an elastic rubber component and a pressure valve fixedly mounted on a partition, and the solenoid valve is connected to the infusion tube.

[0014] Preferably, the spraying assembly includes an atomizing nozzle uniformly connected to the movable seat, and the atomizing nozzle is connected to the infusion pipe through the cavity inside the movable seat, and the atomizing nozzle faces the joint of the drain pipe.

[0015] Preferably, a traction rope is fixedly connected to the outer side of the movable seat, and the other end of the traction rope is fixedly connected to the outer side of the elastic rubber part. During the expansion of the elastic rubber part, the traction rope is pulled to drive the movable seat to rotate elastically.

[0016] Preferably, a first limiting block and a second limiting block are symmetrically fixedly arranged on the inner walls of both sides of the housing, and a movable squeezing block is fixedly arranged on the outer side of the movable seat. The movable squeezing block is located between the first limiting block and the second limiting block. At the same time, a second pressure regulating bladder is fixedly connected between the second limiting block and the movable squeezing block. The second pressure regulating bladder and the sealing bladder are connected by a pipe. When the elastic rubber element pulls the movable seat to rotate, the second limiting block and the movable squeezing block squeeze the second pressure regulating bladder.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the water supply and drainage pipe end pressure bearing interface sealing test equipment can be conveniently and stably installed at the drainage pipe test position, and can adaptively adjust the installation sealing according to pressure changes to ensure test accuracy. At the same time, it can automatically mark the leak point location. The specific details are as follows.

[0018] 1. Equipped with a connecting pipe, elastic clamp, and adjusting seat, the housing and connecting pipe are fitted onto the outside of the drain pipe to cover the joint of the drain pipe. Then, rotating the adjusting seat allows the adjusting seat to press and push the elastic clamp as it rotates into the outside of the connecting pipe, causing the elastic clamp to deform elastically and clamp and lock onto the outside of the drain pipe, thereby achieving the fixed installation of the testing equipment.

[0019] Furthermore, a first pressure regulating bladder and a sealing bladder are also provided. As the adjusting seat is rotated inward, it will also squeeze the first pressure regulating bladder, so that some of the gas in the first pressure regulating bladder enters the sealing bladder through the pipe, causing the sealing bladder to expand and deform. After expansion, the sealing bladder can fit tightly between the shell and the drain pipe, achieving a stable seal in the detection working area.

[0020] 2. The device is equipped with an elastic rubber component, a traction rope, and a second pressure regulating bladder. As the air pressure inside the negative pressure chamber decreases, the elastic rubber component undergoes elastic deformation, causing it to pull the movable seat to rotate via the traction rope. This causes the movable squeezing block on the movable seat to work in conjunction with the second limiting block to gradually squeeze the second pressure regulating bladder. This allows the fluid in the second pressure regulating bladder to enter the sealing bladder, causing it to expand further. Thus, the sealing effect of the sealing bladder can be adaptively adjusted according to the changes in air pressure inside the negative pressure chamber, ensuring detection accuracy.

[0021] 3. Equipped with an elastic rubber component, a suction tube, a solenoid valve, and a movable seat, the elastic rubber component deforms under negative pressure. The cavity between the partition and the elastic rubber component automatically draws the marking pigment from the storage chamber through the suction tube. When the air pressure is restored, the elastic rubber component elastically recovers, allowing the drawn-in marking pigment to flow back into the storage chamber through the pressure valve. When a leak is detected, the solenoid valve automatically opens, allowing the drawn-in marking pigment to enter the cavity of the movable seat through the infusion tube and be sprayed onto the seam through the atomizing nozzle. The movable seat rotates synchronously to ensure uniform spray adhesion. The airflow at the leak point prevents pigment adhesion, thus achieving leak point marking. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the installation structure of the connecting pipe and the elastic clamping plate of the present invention;

[0024] Figure 3 This is a schematic diagram of the disassembled structure of the connecting tube and adjusting seat of the present invention;

[0025] Figure 4 This is a schematic diagram of the main cross-sectional structure of the present invention;

[0026] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0027] Figure 6 This is a schematic diagram of the installation structure of the suction tube, solenoid valve, and infusion tube of the present invention;

[0028] Figure 7 This is a schematic diagram of the installation structure of the first limiting block and the second limiting block of the present invention;

[0029] Figure 8 This is a schematic diagram of the installation structure of the movable seat and movable extrusion block of the present invention;

[0030] Figure 9 This is a schematic diagram of the connection structure of the first pressure regulating bladder, the sealing bladder, and the second pressure regulating bladder of the present invention.

[0031] In the diagram: 1. Shell; 2. Connecting pipe; 3. Elastic clamp; 4. Adjusting knob; 5. First pressure regulating bladder; 6. Sealing bladder; 7. Pump body; 8. Partition; 9. Liquid storage chamber; 10. Negative pressure chamber; 11. Suction pipe; 12. Elastic rubber part; 13. Suction pipe; 14. Solenoid valve; 15. Movable seat; 16. Atomizing nozzle; 17. Infusion pipe; 18. Pressure valve; 19. Traction rope; 20. First limiting block; 21. Second limiting block; 22. Movable squeezing block; 23. Second pressure regulating bladder. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: Existing interface sealing testing equipment has a fixed installation structure, which cannot adaptively adjust the sealing effect according to pressure changes during the testing process. This makes it easy for leaks to exist in the testing area, thus affecting the overall testing accuracy. To solve this technical problem, this example discloses the following technical content. Please refer to [link / reference]. Figures 1-5 and Figures 7-9 As shown;

[0034] A device for testing the sealing performance of a pressure-bearing interface of a water supply and drainage pipe includes a housing 1 fitted onto the outside of the drainage pipe interface. Locking components for locking the housing 1 are provided at both ends of the housing 1. A pump body 7 is provided on the outside of the housing 1. A sealing bladder 6 is embedded in the housing 1. A partition 8 is fixedly provided in the inner cavity of the housing 1, dividing the inner side of the housing 1 into a liquid storage chamber 9 and a negative pressure chamber 10. A sensor module for detecting air pressure is provided inside the negative pressure chamber 10. A pressure regulating component for adjusting the internal pressure of the sealing bladder 6 is also provided on the housing 1, and the pressure regulating component is controlled and adjusted by the air pressure inside the negative pressure chamber 10. An elastic rubber component 12 is fixedly installed in the inner ring of the partition 8. A movable seat 15 is symmetrically and elastically rotatably installed on the inner side of the housing 1.

[0035] The locking assembly includes connecting pipes 2 symmetrically and integrally arranged on both sides of the housing 1. The outer wall of the connecting pipe 2 has an external thread structure, and an adjusting seat 4 is threaded to the outer side of the connecting pipe 2. An elastic clamp 3 is uniformly fixedly connected to the end of the connecting pipe 2 away from the housing 1. The side of the elastic clamp 3 away from the drain pipe is set with an incline. When the adjusting seat 4 moves away from the housing 1, it pushes the elastic clamp 3 to rotate elastically and clamp it to the outer wall of the drain pipe. The pressure regulating assembly includes a first pressure regulating bladder 5 embedded in the outer wall of the connecting pipe 2. A portion of the first pressure regulating bladder 5 protrudes from the outer wall of the connecting pipe 2. During the movement of the adjusting seat 4, the first pressure regulating bladder 5 is squeezed. The first pressure regulating bladder 5 and the sealing bladder 6 are connected by a pipe. The sealing bladder 6 is arranged in a circular structure. There are two sealing bladders 6 symmetrically arranged about the housing 1. After the sealing bladder 6 expands, it seals against the outer wall of the drain pipe. The two sealing bladders 6 are located on both sides of the drain pipe port. The partition 8 and the elastic rubber part 12 are attached to each other. The pump body 7 is arranged in a circular ring structure, and an air suction pipe 11 is connected between the suction end of the pump body 7 and the negative pressure chamber 10. Simultaneously, the elastic rubber part 12 deforms when the air pressure inside the negative pressure chamber 10 decreases. A traction rope 19 is fixedly connected to the outside of the movable seat 15, and the other end of the traction rope 19 is fixedly connected to the outside of the elastic rubber part 12. During the expansion of the elastic rubber part 12, it pulls the traction rope 19 to drive the movable seat 15 to rotate elastically. First limiting blocks 20 and... are symmetrically fixedly arranged on the inner walls of both sides of the housing 1. The second limiting block 21 and the movable pressing block 22 are fixedly provided on the outer side of the movable seat 15. The movable pressing block 22 is located between the first limiting block 20 and the second limiting block 21. At the same time, the second limiting block 21 and the movable pressing block 22 are fixedly connected to the second pressure regulating bladder 23. The second pressure regulating bladder 23 and the sealing bladder 6 are connected by a pipe. When the elastic rubber part 12 pulls the movable seat 15 to rotate, the second limiting block 21 and the movable pressing block 22 squeeze the second pressure regulating bladder 23.

[0036] By fitting the housing 1 and connecting pipe 2 onto the outside of the drain pipe, and then inserting and fixing the interfaces of the two drain pipes, the housing 1 is moved to the outside of the joint to cover the joint of the drain pipe. Then, rotating the adjusting seat 4 allows it to press and push the elastic clamp 3 as it rotates outwards from the connecting pipe 2, causing the elastic clamp 3 to deform elastically. At this time, multiple elastic clamps 3 can clamp and lock onto the outside of the drain pipe, thus achieving the fixed installation of the testing equipment. As the adjusting seat 4 rotates inwards, it also presses the first pressure regulating bladder 5, causing some of the gas in the first pressure regulating bladder 5 to enter the sealing bladder 6 through the pipe, causing the sealing bladder 6 to expand and deform. After expansion, the sealing bladder 6 can tightly fit between the housing 1 and the drain pipe, achieving a stable seal in the testing area. Then, a seal test is performed, and the process is started. The pump body 7 draws air from the inside of the negative pressure chamber 10 through the air extraction pipe 11, thereby reducing the air pressure outside the drain pipe joint. As the air pressure inside the negative pressure chamber 10 decreases, the elastic rubber part 12 undergoes elastic deformation under the action of air pressure, that is, the elastic rubber part 12 bulges towards the location of the drain pipe. This causes the elastic rubber part 12 to pull the movable seat 15 to rotate through the traction rope 19. This causes the movable squeezing block 22 on the movable seat 15 to work with the second limiting block 21 to gradually squeeze the second pressure regulating bladder 23, causing the fluid in the second pressure regulating bladder 23 to enter the sealing bladder 6, causing the sealing bladder 6 to expand further. This allows the sealing effect of the sealing bladder 6 to be adaptively adjusted according to the changes in the air pressure inside the negative pressure chamber 10, ensuring the sealing between the negative pressure chamber 10 and the outer wall of the drain pipe, and ensuring the detection accuracy.

[0037] Example 2: The technical content disclosed in this example is a further improvement based on Example 1. Existing interface sealing testing equipment is inconvenient for automatically and accurately marking leak points during the testing process. To further solve this technical problem, this example discloses the following technical content, such as... Figures 4-8 As shown; a liquid delivery assembly for conveying marking pigment is installed at the lower end of the partition 8, and a movable seat 15 is symmetrically and elastically rotatably installed on the inner side of the housing 1. A liquid spraying assembly is provided on the movable seat 15, and a liquid delivery pipe 17 for conveying pigment is connected between the liquid spraying assembly and the elastic rubber part 12. During the expansion and deformation of the elastic rubber part 12, the movable seat 15 is driven to rotate elastically.

[0038] The infusion assembly includes a suction tube 13 and a pressure valve 18 fixedly installed at the lower end of the partition 8. The inner side of the storage chamber 9 is filled with marking pigment, and the lower end of the suction tube 13 is immersed in the marking pigment. When the elastic rubber part 12 deforms under negative pressure, the cavity between the partition 8 and the elastic rubber part 12 draws out the marking pigment through the suction tube 13. The suction tube 13 is equipped with a one-way valve structure. The infusion assembly also includes a solenoid valve 14 fixedly installed through the elastic rubber part 12 and a pressure valve 18 fixedly installed on the partition 8. The solenoid valve 14 is connected to the infusion tube 17. The spray assembly includes an atomizing nozzle 16 evenly connected to the movable seat 15. The atomizing nozzle 16 is connected to the infusion tube 17 through the cavity inside the movable seat 15, and the atomizing nozzle 16 faces the drain pipe joint.

[0039] As the elastic component 12 deforms under negative pressure, the cavity between the partition 8 and the elastic component 12 automatically draws the marking pigment from the storage chamber 9 through the suction pipe 13. When the sensor module detects that the internal air pressure of the negative pressure chamber 10 remains constant, it controls the internal air pressure of the negative pressure chamber 10 to recover, and the elastic component 12 elastically recovers, so that the drawn-in marking pigment flows back into the storage chamber 9 through the pressure valve 18. When the sensor module detects a change in air pressure due to a leak in the drain pipe, it controls the solenoid valve 14 to open automatically through the controller. As the leak continues, the internal air pressure of the negative pressure chamber 10 gradually increases, and the elastic component 12 gradually recovers, so that the drawn-in marking pigment enters the cavity in the movable seat 15 through the infusion pipe 17 and is sprayed onto the splice seam through the atomizing nozzle 16. During the recovery process of the elastic component 12, the movable seat 15 will elastically rotate and reset, thereby driving the atomizing nozzle 16 to move and adjust evenly to ensure the uniformity of spray adhesion. The airflow at the leak point will prevent the pigment from adhering, thus achieving leak point marking.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for testing the sealing performance of a pressure-bearing interface of a water supply and drainage pipe, comprising a housing (1) sleeved on the outside of the drainage pipe interface, wherein locking components for locking the housing (1) are provided at both ends of the housing (1), and a pump body (7) is provided on the outside of the housing (1), wherein the locking components include connecting pipes (2) symmetrically and integrally disposed on both sides of the housing (1), and the outer wall of the connecting pipes (2) is provided with an external thread structure, and an adjusting seat (4) is threadedly connected to the outer side of the connecting pipes (2), characterized in that: A sealing bladder (6) is embedded in the housing (1). A partition (8) is fixedly provided in the inner cavity of the housing (1), and the partition (8) divides the inner side of the housing (1) into a liquid storage chamber (9) and a negative pressure chamber (10). A sensor module for detecting air pressure is provided inside the negative pressure chamber (10). A pressure regulating component for adjusting the internal pressure of the sealing bladder (6) is also provided on the housing (1). The pressure regulating component is controlled and adjusted by the air pressure inside the negative pressure chamber (10). The pressure regulating component includes a first pressure regulating bladder (5) embedded in the outer wall of the connecting pipe (2). Part of it protrudes from the outer wall of the connecting pipe (2), and the first pressure regulating bladder (5) is squeezed during the movement of the adjusting seat (4). The first pressure regulating bladder (5) and the sealing bladder (6) are connected by a pipe. The inner ring of the partition (8) is sealed and fixedly installed with an elastic rubber part (12), and the lower end of the partition (8) is equipped with an infusion assembly for conveying the marking pigment. The partition (8) and the elastic rubber part (12) are in close contact, and the elastic rubber part (12) is arranged in a circular structure. An air suction pipe (11) is connected between the suction end of the pump body (7) and the negative pressure chamber (10). At the same time, the elastic rubber part (12) is in the negative pressure chamber (10). 0) When the internal air pressure decreases, deformation occurs. The inner side of the shell (1) is also symmetrically and elastically mounted with a movable seat (15). A spraying assembly is provided on the movable seat (15). A liquid delivery pipe (17) for conveying pigment is connected between the spraying assembly and the elastic rubber part (12). A traction rope (19) is fixedly connected to the outer side of the movable seat (15). The other end of the traction rope (19) is fixedly connected to the outer side of the elastic rubber part (12). During the expansion of the elastic rubber part (12), the traction rope (19) is pulled to drive the movable seat (15) to rotate elastically. The inner walls on both sides of the shell (1) are symmetrically and fixedly provided with the first A limiting block (20) and a second limiting block (21) are provided, and a movable squeezing block (22) is fixedly provided on the outside of the movable seat (15). The movable squeezing block (22) is located between the first limiting block (20) and the second limiting block (21). At the same time, a second pressure regulating bladder (23) is fixedly connected between the second limiting block (21) and the movable squeezing block (22). The second pressure regulating bladder (23) and the sealing bladder (6) are connected by a pipe. When the elastic rubber part (12) pulls the movable seat (15) to rotate, the second limiting block (21) and the movable squeezing block (22) squeeze the second pressure regulating bladder (23).

2. The sealing test device for the pressure-bearing interface of a water supply and drainage pipe according to claim 1, characterized in that: The end of the connecting pipe (2) away from the shell (1) is uniformly fixedly connected with an elastic clamp (3), and the side of the elastic clamp (3) away from the drain pipe is set with an incline. When the adjusting seat (4) is away from the shell (1), it pushes the elastic clamp (3) to rotate elastically and clamp it on the outer wall of the drain pipe.

3. The sealing test device for the pressure-bearing interface of a water supply and drainage pipe according to claim 1, characterized in that: The sealing bladder (6) is arranged in a circular structure, and there are two sealing bladders (6) symmetrically arranged about the shell (1). After the sealing bladder (6) expands, it seals and fits against the outer wall of the drain pipe. At the same time, the two sealing bladders (6) are located on both sides of the drain pipe port.

4. The sealing test device for the pressure-bearing interface of a water supply and drainage pipe according to claim 1, characterized in that: The infusion assembly includes a suction tube (13) fixedly installed at the lower end of the partition (8), and the inner side of the storage chamber (9) is filled with marking pigment. The lower end of the suction tube (13) is immersed in the marking pigment. When the elastic rubber part (12) deforms under negative pressure, the cavity between the partition (8) and the elastic rubber part (12) draws out the marking pigment through the suction tube (13). The suction tube (13) is equipped with a one-way valve structure.

5. The sealing test device for the pressure-bearing interface of a water supply and drainage pipe according to claim 4, characterized in that: The infusion assembly also includes a solenoid valve (14) that is fixedly mounted on the elastic rubber part (12) and a pressure valve (18) that is fixedly mounted on the partition (8), and the solenoid valve (14) and the infusion tube (17) are connected.

6. The sealing test device for the pressure-bearing interface of a water supply and drainage pipe according to claim 1, characterized in that: The spray assembly includes an atomizing nozzle (16) uniformly connected to the movable seat (15), and the atomizing nozzle (16) is connected to the infusion pipe (17) through the cavity inside the movable seat (15), and the atomizing nozzle (16) faces the drain pipe splice.

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