A type of existing pipeline PT testing penetration tool

Abstract

This utility model relates to the field of nondestructive testing technology and discloses a permeation fixture for PT testing of existing pipelines. It includes a base, a central shaft, a central spring, and two opening and closing mechanisms. The central shaft is slidably connected to the base, and the two opening and closing mechanisms are symmetrically arranged on both sides of the central shaft. Each opening and closing mechanism includes a cavity tile, a balancing swing assembly, and a guide wheel. One end of the cavity tile is rotatably connected to the central shaft, and the guide wheel is rotatably mounted on the base. The outer wall of the cavity tile abuts against the guide wheel, and the two cavity tiles can be fastened together to form a hollow cylindrical immersion section. The balancing swing assembly includes a connector, a swing rod, and a balancing spring. The balancing swing assembly and the central spring work together to allow the two cavity tiles to adaptively lock in both open and closed states. This permeation fixture can establish an immersion environment at the location of the pipe section to be tested in an existing pipeline. Permeation fluid is applied to the outer wall of the pipe section to be tested through immersion, ensuring uniform application of the permeation fluid. It can also be directly connected to feeding equipment such as robotic arms, which helps improve testing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of non-destructive testing technology, specifically to an existing pipeline PT testing penetration tool. Background Technology

[0002] PT testing, also known as dye penetrant testing or fluorescent penetrant testing, is a non-destructive testing method. It involves applying a penetrant to the workpiece through methods such as immersion, spraying, or brushing. Utilizing physical phenomena like capillary action and surface tension, the penetrant penetrates into defects within the workpiece, allowing for the detection of surface and internal defects by observing the penetration process. For more uniform penetrant application, immersion is preferred when performing PT testing on workpieces with curved surfaces, such as pipes.

[0003] Existing pipelines refer to pipelines that have already been put into use or installed and are fixedly installed within the facility's working area. Currently, it is difficult to establish an immersion environment when performing PT testing on existing pipelines. Typically, penetrant is applied to the outer wall of the pipeline using methods such as spraying or brushing. This inevitably leads to uneven application of the penetrant, affecting the testing quality. Furthermore, existing methods for applying penetrant to existing pipelines are mostly manual operations, and given that existing pipelines are often installed in space-constrained locations within the working area, there are difficulties in operation and testing. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a PT testing permeation tool for existing pipelines. It can establish an immersion environment at the location of the pipe section to be tested in the existing pipeline, and apply the permeation liquid to the outer wall of the pipe section to be tested by immersion, ensuring that the permeation liquid is applied evenly. At the same time, it can be directly applied to feeding equipment such as robotic arms, which helps to reduce labor intensity and improve testing efficiency.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A PT (Potential Test) fixture for pipelines includes a base, a central shaft, an intermediate spring, and two opening and closing mechanisms. The central shaft is slidably connected to the base, and the sliding direction of the central shaft on the base is along the radial direction of the central shaft. The two opening and closing mechanisms are symmetrically arranged on both sides of the sliding path of the central shaft axis. Each opening and closing mechanism includes a cavity tile, a balancing swing assembly, and a guide wheel. The cavity tile is a hollow semi-annular column, with one end rotatably connected to the central shaft. The guide wheel is rotatably mounted on the base, and the outer wall of the cavity tile abuts against the guide wheel. The two cavity tiles can be fastened to form a hollow cylindrical immersion part. Both ends of the immersion part have clamping and sealing holes adapted to the pipeline to be tested. The balancing swing assembly includes a connector, a swing rod, and a balance spring. One end of the connector is rotatably sleeved on the central shaft, and the other end of the connector is slidably connected to one end of the swing rod. The other end of the swing rod is rotatably connected to the base. The balance spring is used to provide a balancing mechanism for the pipeline to be tested. The connecting head and the swing arm have a spring force that keeps them away from each other; the line connecting the two swing arms to the base is defined as the baseline. When the two cavity tiles are open, the axis of the central shaft is located on the side of the baseline away from the base; when the two cavity tiles are closed, the axis of the central shaft is located on the side of the baseline close to the base. The intermediate spring provides the spring force to open the two cavity tiles outward, and the intermediate spring is adapted to the two opening and closing mechanisms. By clamping and closing the pipe section to be tested with the two cavity tiles, an immersion environment can be established at the location of the pipe section to be tested in the existing pipeline. The permeating liquid is applied to the outer wall of the pipe section to be tested through immersion, ensuring uniform application of the permeating liquid. The intermediate spring and the balance spring work together to adaptively lock when the two cavity tiles are open and closed. The base can be installed on the execution end of the feeding equipment such as a robot. By moving the base closer to or further away from the pipe section to be tested, the closed or open state of the two cavity tiles can be switched. The immersion and permeation process can be directly completed by the feeding equipment such as a robot, which helps to reduce labor intensity and improve detection efficiency.

[0007] Specifically, support rods are fixedly connected to both ends of the central shaft. The axis of the support rods is located within the plane of symmetry of the two opening and closing mechanisms. A positioning arc surface is machined at the end of the support rod away from the central shaft. The positioning arc surface is adapted to the pipe to be tested. The positioning arc surface is used to position the existing pipe PT testing penetration tool and the pipe to be tested, so that the pipe section to be tested is located at the center position between the two cavity tiles, avoiding interference when the two cavity tiles are closed.

[0008] Specifically, the balance swing assembly also includes a reaction plate, which is threaded onto the swing arm. The two ends of the balance spring are respectively connected to the reaction plate and the connector. Rotating the reaction plate can adjust the elastic force of the balance spring.

[0009] Specifically, the cavity tile is provided with permeation liquid holes, which are used to connect the inner cavity of the soaking part with the outside world. Permeation liquid can be injected into or discharged into the soaking part through the permeation liquid holes.

[0010] Furthermore, a liquid flow channel is machined in the central shaft along the axial direction, and a connecting hole is machined in the central shaft along the radial direction. One end of the connecting hole is connected to the liquid flow channel, and the other end of the connecting hole is adapted to the permeate hole.

[0011] Furthermore, the base has a liquid flow chamber and a plunger rod. One end of the plunger rod is slidably adapted to the liquid flow chamber. The plunger rod is fixedly connected to the central shaft. A flow channel is machined inside the plunger rod. The two ends of the flow channel are respectively connected to the liquid flow chamber and the liquid channel. A permeation pipe is also fixedly installed on the base. One end of the permeation pipe is connected to the liquid flow chamber. An external injection pipe can be directly connected to the permeation pipe to avoid the situation where the sealing of the soaking part fails due to the dragging of the external injection pipe during the soaking and permeation process.

[0012] Specifically, a receiving groove is machined at one end of the base near the central axis, and a drain pipe is fixedly installed on the base. One end of the drain pipe is connected to the receiving groove, which can collect the permeate leaking from the bottom side of the soaking part for recycling.

[0013] Specifically, it also includes a protective cover, one end of which is fixedly connected to the base, and the other end of which forms an opening adapted to the pipe to be tested. The opening and closing mechanism is set inside the protective cover. The protective cover can prevent the two cavity tiles from closing due to collision between the cavity tiles and obstacles in the environment during the transfer of the permeation tool.

[0014] The beneficial effects of this utility model are:

[0015] This existing pipeline PT testing permeation fixture includes a base, a central shaft, an intermediate spring, and two opening and closing mechanisms. Each opening and closing mechanism includes a cavity tile, a balancing swing assembly, and a guide wheel. The balancing swing assembly includes a connector, a swing rod, and a balancing spring. The central shaft is slidably connected to the base. The two opening and closing mechanisms are symmetrically arranged on both sides of the sliding path along the central shaft axis. One end of the cavity tile is rotatably connected to the central shaft, and the guide wheel is rotatably mounted on the base. The outer wall of the cavity tile abuts against the guide wheel. When the central shaft slides, it can drive the two cavity tiles to open or close. The cavity tiles are hollow semi-annular cylinders. The two cavity tiles can be interlocked to form a hollow cylindrical immersion section. When the two cavity tiles clamp the pipe section to be tested at the location of the existing pipeline and close, an annular cylinder cavity is formed around the outer circumference of the pipe section to be tested, establishing an immersion environment. Injecting permeate into this cavity applies permeate to the outer wall of the pipe section to be tested in an immersion manner, ensuring uniform application of the permeate.

[0016] One end of the connector is rotatably mounted on the central shaft, and the other end of the connector is slidably connected to one end of the swing arm. The other end of the swing arm is rotatably connected to the base. A balance spring provides the elastic force to keep the connector and the swing arm away from each other. The line connecting the two swing arms to the base is defined as the baseline. When the two cavity tiles are open, the axis of the central shaft is located on the side of the baseline away from the base. When the two cavity tiles are closed, the axis of the central shaft is located on the side of the baseline closer to the base. An intermediate spring provides the elastic force to open the two cavity tiles outward. The intermediate spring is adapted to the two opening and closing mechanisms. Under the synergistic action of the intermediate spring and the balance spring, the two cavity tiles can be adaptively locked when opening and closing. At the same time, the switching between the closed and open states of the two cavity tiles can be achieved simply by moving the base closer to or away from the pipe section to be tested. Therefore, this existing pipeline PT testing and penetration fixture can be directly installed on the execution end of a robotic arm or other feeding equipment. The immersion and penetration process can be directly completed by the robotic arm or other feeding equipment, which helps to reduce labor intensity and improve testing efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an existing pipeline PT testing and penetration tool according to the present invention;

[0018] Figure 2 for Figure 1 The diagram shows the structure of the existing pipeline PT testing penetration tool after the protective cover has been removed.

[0019] Figure 3 This is a schematic diagram of the two opening and closing mechanisms in the open state of this utility model;

[0020] Figure 4 This is a schematic diagram of the two opening and closing mechanisms in the closed state of this utility model;

[0021] Figure 5 This is a schematic diagram of the disassembled structure of the balancing swing assembly in this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the cavity tile of this utility model;

[0023] Figure 7 This is a schematic diagram of the permeate flow path in an existing pipeline PT testing permeation fixture according to this utility model;

[0024] Figure 8 This is a schematic diagram illustrating the usage status of an existing pipeline PT testing and penetration tool according to this utility model;

[0025] In the diagram, 1-protective cover, 2-base, 3-central shaft, 4-cavity tile, 5-guide wheel, 6-tested pipe section, 7-horseshoe-shaped rubber pad, 8-connector, 9-swing rod, 10-balance spring, 11-intermediate spring, 12-reaction plate, 13-support rod, 14-positioning arc surface, 15-permeate hole, 16-liquid flow channel, 17-connecting hole, 18-liquid flow cavity, 19-plunger rod, 20-flow channel, 21-permeate pipe, 22-receiving groove, 23-drain pipe. Detailed Implementation

[0026] The technical solution of this utility model is described in further detail below with reference to the accompanying drawings, but the scope of protection of this utility model is not limited to the following description.

[0027] like Figures 1 to 6 As shown, an existing pipeline PT testing penetration tool includes a base 2, a central shaft 3, and two opening and closing mechanisms. The central shaft 3 is slidably connected to the base 2, and the sliding direction of the central shaft 3 on the base 2 is along the radial direction of the central shaft 3. The two opening and closing mechanisms are symmetrically arranged on both sides of the sliding path of the central shaft 3 axis.

[0028] like Figure 3 , Figure 4 , Figure 6 As shown, the opening and closing mechanism includes a cavity tile 4, a balancing swing assembly, and a guide wheel 5. The cavity tile 4 is machined into a hollow semi-annular shape, with one end rotatably connected to the central shaft 3. The guide wheel 5 is rotatably mounted on the base, and the outer wall of the cavity tile 4 abuts against the guide wheel 5. In implementation, the guide wheel 5 can be made of a bearing of a suitable size, such as... Figure 4 As shown, when the central shaft 3 slides towards the base 2, the guide wheel 5 guides and limits the movement of the two cavity tiles 4, causing the ends furthest from the central shaft 3 to approach each other until they close. The cavity tiles 4 are custom-made to fit the dimensions of the pipe to be tested. When the two cavity tiles 4 close, they interlock to form a hollow cylindrical soaking section. Both ends of the soaking section have clamping and sealing holes adapted to the pipe to be tested, such as... Figure 8 As shown, during use, the pipe section 6 to be tested is clamped between two cavity tiles 4. The two clamping sealing holes are tightly sealed against the outer wall of the pipe section 6, forming an annular sealed cavity between the immersion section and the pipe section 6. Injecting penetrating liquid into this annular sealing ring allows for immersion and penetration of the area of ​​the pipe section 6 clamped by the two cavity tiles 4. In specific implementation, as follows... Figure 6 As shown, horseshoe-shaped rubber pads 7 are bolted to both ends of the cavity tile 4. The horseshoe-shaped rubber pads 7 are made to fit the outer diameter of the pipe 6 to be tested, which can ensure the sealing effect of the sealing hole when the two cavity tiles 4 are closed. At the same time, the horseshoe-shaped rubber pads 7 can be replaced to be used for pipes 6 of different sizes to be tested.

[0029] like Figures 3 to 5As shown, the balancing pendulum assembly includes a connector 8, a pendulum rod 9, and a balance spring 10. One end of the connector 8 is rotatably sleeved on the central shaft 3, and the other end of the connector 8 is slidably connected to one end of the pendulum rod 9 (e.g., ...). Figure 5 As shown, in this embodiment, one end of the connector 8 and one end of the swing rod 9 are slidably connected using a telescopic sleeve structure. The other end of the swing rod 9 is rotatably connected to the base 2. The two ends of the balance spring 10 are connected to the connector 8 and the swing rod 9 respectively, and the balance spring 10 provides a spring force to move the connector 8 and the swing rod 9 away from each other. An intermediate spring 11 is also provided, with its two ends connected to two cavity tiles 4 respectively. The intermediate spring 11 is in a compressed state to provide a spring force to open the two cavity tiles 4 outwards. The intermediate spring 11 is adapted to the two opening and closing mechanisms. The line connecting the two swing rods 9 to the connection ends of the base 2 is defined as the baseline, such as... Figure 3 As shown, when the two cavity tiles 4 open, the axis of the central shaft 3 is located on the side of the baseline away from the base 2. At this time, the elastic force of the two balance springs 10 acting on the connector 8 is transmitted to the central shaft 3, forming a resultant force on the central shaft 3 in the direction away from the base 2. In addition, the intermediate spring 11 provides an elastic force to make the two cavity tiles 4 open outward, which can adaptively maintain the outward opening posture of the two cavity tiles 4; as Figure 4 As shown, when the two cavity tiles 4 are closed, the axis of the central shaft 3 is located on the side of the baseline close to the base 2. At this time, the elastic force of the two balance springs 10 acting on the connector 8 is transmitted to the central shaft 3, forming a resultant force on the central shaft 3 in the direction close to the base 2, which can adaptively maintain the two cavity tiles 4 in a closed posture.

[0030] In specific implementation, such as Figure 2 As shown, support rods 13 are fixedly connected to both ends of the central shaft 3. The axis of the support rods 13 is located in the plane of symmetry of the two opening and closing mechanisms. The end of the support rods 13 away from the central shaft is machined with a positioning arc surface 14, which is adapted to the pipe to be tested.

[0031] This existing pipeline PT testing permeation fixture can be mounted on feeding equipment such as a robotic arm to complete the permeation process when performing PT testing on existing pipelines. During use, the base 2 is connected to the end of the feeding equipment. Initially, the two cavity tiles 4 are in an open position. The usage process of this existing pipeline PT testing permeation fixture is as follows:

[0032] S1. The existing pipeline PT testing and penetration tool is moved to the test section 6 by the feeding equipment. Since the two cavity tiles 4 adaptively maintain an open posture, the open posture can be maintained during the transfer so that the ends of the two cavity tiles 4 away from the central axis 3 can pass over the two sides of the test section 6 respectively, until the existing pipeline PT testing and penetration tool is moved to the center position between the two cavity tiles 4.

[0033] S2. The base 2 is moved further towards the pipe segment 6 to be tested by the feeding device until the pipe segment 6 abuts against the two positioning arc surfaces 14. The support rod 13 transmits force to drive the central shaft 3 to slide towards the base 2, thereby gradually closing the two cavity tiles 4. (During this process, the posture of the base 2 can be adjusted according to the fit between the positioning arc surfaces 14 and the pipe segment 6. When the positioning arc surfaces 14 are fully fitted with the outer wall of the pipe segment 6, the axis of the pipe segment 6 can be basically located at the center between the two cavity tiles 4, avoiding interference or jamming when the two cavity tiles 4 close.) This continues until... Figure 8 In the state shown, the pipe segment 6 to be tested is clamped between the two cavity tiles 4, and an annular sealed cavity is formed between the immersion part and the outer wall of the pipe segment 6 to be tested. At this time, the two cavity tiles 4 adaptively remain in the closed state.

[0034] S3. Inject permeate into the annular sealing cavity, soak for a set time according to the type of permeate and the size of the defect, and then drain the permeate.

[0035] S4. The base 2 is moved away from the test tube segment 6 by the feeding device. During the movement, the test tube segment 6 will exert a force on the two cavity tiles 4 in the direction away from the base 2. This force is transmitted to the central shaft 3 through the two cavity tiles 4, causing the central shaft 3 to slide away from the base 2. With the elastic force of the intermediate spring 11, the two cavity tiles 4 can be opened outward until the test tube segment 6 is dislodged from between the two cavity tiles 4.

[0036] As mentioned above, the existing pipeline PT testing permeation tool can establish an immersion environment at the location of the pipe section 6 to be tested in the existing pipeline through two cavity tiles 4, and apply permeation liquid to the outer wall of the pipe section 6 to be tested by immersion to ensure uniform application of permeation liquid.

[0037] Because the combined elastic force of the intermediate spring 11 and the two balance springs 10 allows the two cavity tiles 4 to adaptively maintain an open posture, this is beneficial in step S1, as they are moved into the equipment by a robotic arm or similar device, ensuring their stable open state. The intermediate spring 11 is adapted to the two opening and closing mechanisms, such as... Figure 4As shown, when the two cavity tiles 4 are fully closed after step S2, the intermediate spring 11 is in the lateral posture shown in the figure and is exactly in the balance position between the two guide wheels 5. The force exerted by the intermediate spring 11 on the cavity tile 4 is canceled out by the reaction force of the guide wheels 5 on the cavity tile 4, and cannot push the two cavity tiles 4 outward. At the same time, since the two balance springs 10 are applying a resultant force to the central axis 3 in the direction close to the base 2, they can always keep the two cavity tiles 4 under the downward pulling force shown in the figure. In addition, with the limiting effect of the two guide wheels 5, the two cavity tiles 4 always maintain the tendency to close in the closing direction, thus forming a self-locking mechanism, which is beneficial to maintaining the closed posture of the two cavity tiles 4 and the sealing effect of the clamping sealing hole position during step S3; in step S4 In the initial stage, the two cavity tiles 4 move away from the base 2 along with the pipe section 6 to be tested. That is, after the permeation process is completed, it will not interfere with the process of the permeation fixture moving away from the pipe section 6 to be tested. After this initial stage, the intermediate spring 11 is released from the balance position between the two guide wheels 5. The intermediate spring 11 applies an outward opening force to the two cavity tiles 4. At the same time, the central shaft 3 moves to the side of the baseline away from the base 2. The two balance springs 10 apply a resultant force to the central shaft 3 in the direction away from the base 2. Therefore, after this initial stage, the two cavity tiles 4 can be quickly opened outward under the action of the intermediate spring 11 and the two balance springs 10, so that the existing pipeline PT detection permeation fixture can be separated from the pipe section 6 to be tested. As can be seen, due to the setting of the intermediate spring 11 and two balance springs 10, the two cavity tiles 4 can be adaptively locked in both the open and closed positions. The switching of the closing and opening actions of the two cavity tiles 4 can be completed simply by bringing the existing pipeline PT testing and penetration tool closer to or further away from the pipe section 6 to be tested. Therefore, the existing pipeline PT testing and penetration tool can be directly connected to feeding equipment such as robotic arms, which helps to reduce labor intensity and improve testing efficiency.

[0038] In specific implementation, such as Figure 5 As shown, the balance swing assembly also includes a reaction plate 12, which is threaded onto the swing arm 9. The two ends of the balance spring 10 abut against the reaction plate 12 and the connector 8, respectively. Rotating the reaction plate 12 allows it to spiral forward on the swing arm 9, thereby adjusting the distance between the reaction plate 12 and the connector 8, and thus adjusting the compression of the balance spring 10. As a result, the magnitude of the self-locking force (the resultant force of the two balance springs 10 acting on the central shaft 3) can be adjusted as needed.

[0039] In specific implementation, such as Figure 6 As shown, the cavity tile 4 has a permeation hole 15. The permeation hole 15 is used to connect the inner cavity of the soaking part formed by the two cavity tiles 4 being fastened together with the outside. The process of injecting or draining permeation liquid in the aforementioned step S3 can be completed through the permeation hole 15.

[0040] It should be understood that, theoretically, the permeate hole 15 can be set at any position on the cavity tile 4. Connecting an injection pipe to the permeate hole 15 completes the injection and discharge process of the permeate. However, in actual operation, the injection pipe is inevitably subject to pulling and dragging. If the injection pipe is directly connected to the cavity tile 4, when the injection pipe is pulled and dragged, a pulling force will be directly applied through the injection pipe, causing the two cavity tiles 4 to open outwards. This is detrimental to maintaining the sealing performance of the two cavity tiles 4 when they are engaged in the aforementioned step S3. As a preferred embodiment, combined with... Figure 6 , Figure 7 As shown, a liquid flow channel 16 is machined axially within the central shaft 3, and a connecting hole 17 is machined radially on the central shaft 3. One end of the connecting hole 17 communicates with the liquid flow channel 16, and the other end of the connecting hole 17 is adapted to the permeate hole 15 (in practice, an annular groove can be machined on the central shaft 3, through which the connecting hole 17 and the permeate hole 15 are connected). At this time, the inner cavity of the soaking part, the permeate hole 15, the connecting hole 17, and the liquid flow channel 16 are connected. With this arrangement, an external injection pipe can be connected to the central shaft 3, allowing the injection pipe to communicate with the liquid flow channel 16 to realize the process of injecting and draining liquid into the inner cavity of the soaking part. Compared with the implementation of directly connecting the injection pipe to the cavity tile 4, this effectively reduces the impact on the sealing performance of the soaking part caused by the dragging and pulling of the injection pipe.

[0041] However, in the above embodiments, when the force exerted on the injection tube is too great, exceeding the self-locking force of the two balance springs 10, the central shaft 3 will slip, and there is still a risk of sealing failure of the soaking part. Therefore, further, as Figure 7 As shown, a liquid flow chamber 18 is provided inside the base 2, and a plunger rod 19 is also provided. One end of the plunger rod 19 is slidably adapted to the liquid flow chamber 18. The plunger rod 19 is fixedly connected to the central shaft 3. A flow channel 20 is machined inside the plunger rod 19. The two ends of the flow channel 20 are respectively connected to the liquid flow chamber 18 and the liquid flow channel 16. A permeate pipe 21 is also fixedly provided on the base. One end of the permeate pipe 21 is connected to the liquid flow chamber 18. Thus, the permeate pipe 21, the liquid flow chamber 18, the flow channel 20, the liquid flow channel 16, the connecting hole 17, the permeate hole 15, and the inner cavity of the soaking part are connected in sequence. An external injection pipe can be directly connected to the permeate pipe 21 to complete the process of injecting or discharging permeate in the aforementioned step S3. At the same time, even if the external injection pipe is dragged or pulled, it will not affect the sealing performance of the soaking part.

[0042] In specific implementation, such as Figure 7As shown, a receiving groove 22 is machined at one end of the base 2 near the central axis 3, and a drain pipe 23 is fixedly installed on the base 2, with one end of the drain pipe 23 communicating with the receiving groove 22. It should be understood that in the aforementioned embodiment, by adding sealing strips or other means to the mating surfaces of the two cavity tiles 4, the soaking part formed when the two cavity tiles 4 are fastened and clamped together is a completely sealed cavity structure. This embodiment focuses on the sealing performance of the clamping sealing hole position of the soaking section. During use, the base 2 is located directly below the pipe section 6 to be tested. Even if the two cavity tiles 4 are not completely sealed at the end near the central axis 3, the leaked permeate can be collected by the receiving groove 22 and discharged back to the liquid tank for recycling via the drain pipe 23. To ensure the soaking effect of the pipe section 6 to be tested and to prevent permeate leakage from the end of the two cavity tiles 4 away from the central axis 3, during the soaking process in step S3, an equal amount of supplementary permeate can be continuously injected into the soaking section according to the amount of permeate discharged by the drain pipe 23, so that the permeate in the soaking section is always at a height that can completely soak the pipe section 6 to be tested but is lower than the end of the two cavity tiles 4 away from the central axis 3. In addition, with this setting, even if the permeate is not completely discharged during the discharge process in step S3, the receiving groove 22 can also collect the residual permeate when the two cavity tiles 4 are open, so as to realize the recycling of permeate and at the same time avoid the permeate overflow from polluting the working environment.

[0043] In specific implementation, such as Figure 1 As shown, a protective cover 1 is also provided. One end of the protective cover 1 is fixedly connected to the base 2, and the other end of the protective cover 1 forms an opening adapted to the pipe to be tested. The aforementioned opening and closing mechanism is set inside the protective cover 1. By setting the protective cover 1, when the permeation fixture is moved by a robotic arm or other feeding equipment, the situation where the two cavity tiles 4, the central shaft 3, and other components are closed and adaptively locked in the closed state due to the force of collision with obstacles in the surrounding environment can be avoided. This helps to ensure that the two cavity tiles 4 are always in an open state during the transfer process.

[0044] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. An in-service pipeline PT detection permeation tool, characterized in that, It includes a base, a central shaft, an intermediate spring, and two opening and closing mechanisms. The central shaft is slidably connected to the base, and the sliding direction of the central shaft on the base is along the radial direction of the central shaft. The two opening and closing mechanisms are symmetrically arranged on both sides of the sliding path of the central shaft axis. The opening and closing mechanism includes a cavity tile, a balanced swing assembly, and a guide wheel. The cavity tile is hollow semi-annular in shape, with one end rotatably connected to the central shaft. The guide wheel is rotatably mounted on the base, and the outer wall of the cavity tile abuts against and fits the guide wheel. Two cavity tiles can be fastened together to form a hollow cylindrical immersion section. Both ends of the immersion section have clamping and sealing holes adapted to the pipe to be tested. The balancing swing assembly includes a connector, a swing rod, and a balance spring. One end of the connector is rotatably sleeved on the central shaft, and the other end of the connector is slidably connected to one end of the swing rod. The other end of the swing rod is rotatably connected to the base. The balance spring is used to provide an elastic force that moves the connector and the swing rod away from each other. The line connecting the two swing arms to the base is defined as the baseline. When the two cavity tiles are open, the axis of the central shaft is located on the side of the baseline away from the base. When the two cavity tiles are closed, the axis of the central shaft is located on the side of the baseline close to the base. The intermediate spring is used to provide the elastic force to open the two cavity tiles outward. The intermediate spring is adapted to the two opening and closing mechanisms. Support rods are fixedly connected to both ends of the central shaft. The axis of the support rod is located in the plane of symmetry of the two opening and closing mechanisms. The end of the support rod away from the central shaft is machined with a positioning arc surface, which is adapted to the pipe to be tested.

2. A PT detection penetration tool for existing pipelines according to claim 1, characterized in that, The balancing swing assembly also includes a reaction plate, which is threaded onto the swing arm, and the two ends of the balancing spring are respectively connected to the reaction plate and the connector.

3. A PT detection permeation tool for existing pipelines according to claim 1 or 2, characterized in that, The cavity tile is provided with permeation liquid holes, which are used to connect the inner cavity of the soaking part with the outside.

4. A PT detection penetration tool for existing pipelines according to claim 3, characterized in that, A liquid flow channel is machined along the axial direction inside the central shaft, and a connecting hole is machined along the radial direction on the central shaft. One end of the connecting hole is connected to the liquid flow channel, and the other end of the connecting hole is adapted to the permeate hole.

5. A PT detection and penetration tool for existing pipelines according to claim 4, characterized in that, The base has a liquid flow cavity and a plunger rod. One end of the plunger rod is slidably adapted to the liquid flow cavity. The plunger rod is fixedly connected to the central shaft. A flow channel is machined inside the plunger rod. The two ends of the flow channel are respectively connected to the liquid flow cavity and the liquid flow channel. A permeate pipe is also fixedly installed on the base. One end of the permeate pipe is connected to the liquid flow cavity.

6. A PT detection and penetration tool for existing pipelines according to claim 3, wherein, The base has a receiving groove machined at one end near the central axis, and a drain pipe is fixedly installed on the base, with one end of the drain pipe connected to the receiving groove.

7. A PT detection and penetration tool for existing pipelines according to claim 3, characterized in that, It also includes a protective cover, one end of which is fixedly connected to the base, and the other end of which has an opening adapted to the pipe to be tested. The opening and closing mechanism is located inside the protective cover.

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