A pipeline joint sealing detection device

Abstract

The invention relates to a pipeline joint sealing detection device applied to the field of structural sealing test. By arranging sealing pipe hoops on both sides of a detection box, during installation before gas injection detection of a pipeline, an elastic sealing ring on the inner side of the sealing pipe hoops can realize a preliminary seal with an outer wall of the pipeline, and then a hot-melt phase change liquid is injected into the sealing pipe hoops. After defoaming, cooling and solidification, the liquid is sealed between the pipeline and a pair of elastic sealing rings in a solid form as a secondary seal with the outer wall of the pipeline, so that the final detection result is not easily changed due to poor sealing of the two, and the detection accuracy is effectively improved. In addition, a bandage soaked in a phenolphthalein solution can be used to wrap around the connection between the sealing pipe hoops and the pipeline to form a leak detection wet ring, and ammonia gas is selected for gas injection detection. During the detection, by observing whether the leak detection wet ring has a color change, the seal between the sealing pipe hoops and the pipeline is synchronously inspected, thereby further improving the accuracy of pipeline joint sealing detection.

Description

Technical Field

[0001] The present invention relates to a detection device, in particular to a pipeline joint sealing detection device applied in the field of structural sealing test. Background Art

[0002] Pipeline is an important gas or liquid transportation device widely used in all walks of life. Before installation or use or during maintenance, it is necessary to conduct sealing performance testing to check for leaks, especially at pipeline joints. Leaks are often caused by poor installation, looseness or aging of the joints.

[0003] For example, the specification of Chinese patent CN201610308904.X discloses a pipe flange gas leakage detection device, which is installed on the pipeline and covered on the outer periphery of the flange. A cavity is formed between the pipe flange and the flange to be detected to receive the leaked gas from the pipe flange. During detection, a leakage rate measuring instrument is connected to a closed space device through a silicone tube. The calculation method is based on the pipe flange leakage rate formula derived from the gas state equation. The leakage rate measuring instrument collects gas state parameters during the implementation process, and the measuring instrument system obtains the leakage rate value of the pipe flange through data processing.

[0004] As in the above-mentioned technology, when using the method of wrapping the pipeline with the detection device for sealing detection, there is a difficulty, that is, how to ensure the sealing of the connection between the detection equipment and the two ends of the pipeline joint. If there is a leak in the connection between the two, the gas will escape from the connection between the two, causing the test results to change, making it difficult to ensure the accuracy of the joint detection. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to ensure the sealing of the connection between the detection equipment and the two ends of the pipeline joint when performing a sealing test by wrapping the pipeline with a detection device. This is a major factor affecting the test results. When there is a leak at the connection between the two, gas will escape from the connection between the two, causing changes in the test results, making it difficult to ensure the accuracy of the joint detection.

[0006] In order to solve the above problems, the present invention provides a pipeline joint sealing detection device, including a detection box, a double-port airbag is arranged inside the detection box, and two ports of the double-port airbag are respectively fixedly connected to a pair of inner walls of the detection box, an upper end of the detection box is fixedly connected to an air injection pipe, and the lower end of the air injection pipe is fixedly penetrated through the outer wall of the detection box and the double-port airbag and communicated with the inside of the double-port airbag, an air pressure sensor located inside the double-port airbag is fixedly connected to the inner wall of the detection box, a pair of side ends of the detection box are both provided with round through holes, and the pair of round through holes are respectively located on the inner sides of the two ports of the double-port airbag, and a pipe sealing hoop is installed inside the round through holes;

[0007] The sealing pipe clamp includes an outer ring and a mounting ring which are fixedly connected to each other. The mounting ring is located inside the circular through hole, and the outer ring is located outside the detection box. A liquid filling groove is provided at the center of the inner wall of the outer ring. A pair of elastic sealing rings are also fixedly connected to the inner end of the outer ring, and the pair of elastic sealing rings are respectively located on both sides of the liquid filling groove. A bubble removal chain is provided inside the liquid filling groove, and the inner wall of the liquid filling groove is coated with a main magnetic coating which is mutually adsorbed with the bubble removal chain. A liquid injection hole communicating with the outside is provided on the inner wall of the liquid filling groove.

[0008] As a further supplement to the present application, the inner ring diameter of the elastic sealing ring in the initial state is smaller than the inner ring diameter of the liquid filling groove, and the inner ring diameter of the liquid filling groove is smaller than the inner ring diameter of the mounting ring.

[0009] As a further supplement to the present application, the bubble chain includes a pull rope, the outer end of which is fixedly connected to a plurality of evenly distributed beads with a secondary magnetic coating on the outer surface. One end of the pull rope is fixedly connected to a rope guide ring, and the other end thereof movably passes through the inner side of the rope guide ring and the inner wall of the liquid filling groove until it extends to the outside of the outer ring.

[0010] As a further supplement to the present application, the end of the pull rope located outside the outer ring is fixedly connected to a ball head, the inner wall of the liquid filling groove is provided with a rope hole for the pull rope to pass through, the inside of the rope hole is fixedly connected to a sealing sleeve, and the pull rope is slidably connected to the inside of the sealing sleeve.

[0011] A pipeline joint sealing detection device, the use method of which comprises the following steps:

[0012] S1. Pipe fitting installation: insert the pipe fitting with the joint to be tested from the round hole on one side of the test box and let it pass through the other side. The joint part on the pipe fitting is completely located inside the test box;

[0013] S2. Sealing: The sealing hoops on both sides of the test box are respectively mounted on both sides of the pipe joint, and the elastic sealing ring forms a close contact with the outer wall of the pipe fitting to perform a preliminary fixed seal;

[0014] Then, inject a sufficient amount of heated and melted phase change liquid into the liquid filling groove through the liquid injection hole, and manually pull the ball head repeatedly to reduce the bubbles in the phase change liquid so that the phase change liquid can be fully filled between the pipe fitting and the liquid filling groove;

[0015] After defoaming is completed, the phase change liquid is cooled and solidified, so that it is stored in a solid state between the pipeline and the liquid filling tank, and forms a surface sealing state with the two, which serves as a secondary seal between the outer wall of the pipeline;

[0016] S3. Detection: Inject gas into the double-port airbag through the air injection tube until the double-port airbag is in an expanded state and then stop inflating. Then continue to record the air pressure detection data of the air pressure sensor. When the air pressure data remains unchanged, it indicates that the sealing of the pipeline joint is intact. When the air pressure data gradually decreases, it indicates that there may be leakage at the pipeline joint.

[0017] As a further supplement to the present application, the phase change liquid uses heated and melted paraffin, and the melting point of the paraffin is 52°C-58°C.

[0018] As another improvement of the present application, the gas in step S3 is ammonia gas, and an inspection operation is also included between step S2 and step S3, and the inspection operation includes the following process: selecting two sections of bandages soaked in phenolphthalein solution, respectively wrapping them around the outer walls of the pipes on both sides of the detection box to form a leak detection wet ring, and making the leak detection wet ring in close contact with the elastic sealing ring;

[0019] In step S3, when the air pressure data gradually decreases, first observe whether the two leak detection wet rings have turned red. If they have not turned red, it indicates that there may be leakage at the pipe joint. When any of the leak detection wet rings has turned red, the pipe joint needs to be reinstalled and inspected.

[0020] As another improvement of the present application, the outer end of the mounting ring is fixedly connected with a bevel plate, the inner wall of the circular through hole is fixedly connected with a bevel sealing ring, and the end of the bevel plate away from the outer ring and the inner end of the bevel sealing ring respectively present mutually matching cross-sectional structures.

[0021] As another improvement supplement of the present application, a plurality of evenly distributed screw holes are provided on the inclined panel, a pair of side ends of the detection box are provided with a plurality of screw grooves, the plurality of screw grooves correspond one by one to the plurality of screw holes, and bolts are threadedly connected between the two.

[0022] As another improvement supplement of the present application, when performing step S1, the sealing pipe clamp and the detection box are in an uninstalled state, and a sealing pipe clamp installation operation is also included between step S1 and step S2. The sealing pipe clamp installation operation includes the following process: select a pair of sealing pipe clamps that are respectively matched with the outer diameters of the two ends of the pipe fitting, and insert the pair of sealing pipe clamps from the two ends of the pipe fitting respectively until they are in close contact with the bevel sealing ring, and the outer end of the pipe fitting and the inner end of the elastic sealing ring are in an interference fit connection state, and then the sealing pipe clamp is fixed to the side end of the detection box by bolts.

[0023] In summary, the present application arranges pipe sealing clamps on both sides of the detection box. When the pipeline is installed before gas injection detection, the elastic sealing ring on the inner side of the pipe sealing clamp can achieve preliminary sealing between the pipe sealing clamp and the outer wall of the pipeline. Subsequently, the hot-melt phase change liquid is injected between the pipe sealing clamp and the outer wall of the pipeline. After defoaming, cooling and solidification, it is sealed in a solid form between the pipeline and a pair of elastic sealing rings, which serves as a secondary seal with the outer wall of the pipeline, so that the final test result is not easily changed due to poor sealing of the two, and the detection accuracy is effectively improved. In addition, in order to further improve the accuracy of the pipeline joint sealing detection, after completing the above-mentioned installation, a bandage soaked in phenolphthalein solution is used to wrap around the connection between the elastic sealing ring and the pipeline to form a leak detection wet ring. At the same time, ammonia is selected for gas injection detection. By observing whether there is a color change in the leak detection wet ring, the seal between the pipe sealing clamp and the pipeline is synchronously inspected, thereby further improving the accuracy of the pipeline joint sealing detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional diagram of the first embodiment of the present application;

[0025] Figure 2 A three-dimensional diagram of a pipe sealing clamp according to the first embodiment of the present application;

[0026] Figure 3 This is a schematic diagram of the side structure of the first embodiment of the present application. Figure 1 ;

[0027] Figure 4 This is a schematic diagram of the front structure of the sealing pipe clamp of the first embodiment of the present application. Figure 1 ;

[0028] Figure 5 This is a three-dimensional diagram of the defoaming chain according to the first embodiment of the present application;

[0029] Figure 6 This is a schematic diagram of the side structure of the first embodiment of the present application. Figure 2 ;

[0030] Figure 7 This is a schematic diagram of the front structure of the sealing pipe clamp of the first embodiment of the present application. Figure 2 ;

[0031] Figure 8 This is a perspective view of the second embodiment of the present application;

[0032] Fig. 9 This is a side structural schematic diagram of the second implementation mode of the present application;

[0033] Fig.10 This is a three-dimensional diagram of the third embodiment of the present application;

[0034] Fig.11This is a side structural diagram of the third embodiment of the present application. Figure 1 ;

[0035] Fig.12 This is a side structural diagram of the third embodiment of the present application. Figure 2 .

[0036] Description of the numbers in the figure:

[0037] 1 detection box, 2 air injection pipe, 3 double-port air bag, 4 air pressure sensor, 5 outer ring, 501 liquid filling groove, 502 liquid injection hole, 6 mounting ring, 7 elastic sealing ring, 8 bubble removal chain, 801 pull rope, 802 ball, 803 rope guide ring, 804 ball head, 9 sealing sleeve, 10 main magnetic coating, 11 leak detection wet ring, 12 inclined panel, 13 inclined sealing ring, 14 bolt. DETAILED DESCRIPTION

[0038] The following is a detailed description of three implementation methods of the present application in conjunction with the accompanying drawings.

[0039] The first implementation method:

[0040] The present invention provides a pipeline joint sealing detection device, please refer to Figure 1 and Figure 3 , including a detection box 1, a double-port airbag 3 is provided inside the detection box 1, and the two ports of the double-port airbag 3 are respectively fixedly connected to a pair of inner walls of the detection box 1, an upper end of the detection box 1 is fixedly connected to an air injection pipe 2, the lower end of the air injection pipe 2 is fixedly passed through the outer wall of the detection box 1 and the double-port airbag 3 and communicated with the inside of the double-port airbag 3, an inner wall of the detection box 1 is fixedly connected to an air pressure sensor 4 located inside the double-port airbag 3, a pair of side ends of the detection box 1 are each provided with a circular through hole, and a pair of circular through holes are respectively located on the inner sides of the two ports of the double-port airbag 3, and a sealing pipe clamp is installed inside the circular through hole.

[0041] See also Figure 2 and Figure 3 The sealing pipe clamp includes an outer ring 5 and a mounting ring 6 which are fixedly connected to each other. The mounting ring 6 is located inside the circular through hole. In this embodiment, the mounting ring 6 is fixedly connected to the circular through hole. The outer ring 5 is located outside the detection box 1. A liquid filling groove 501 is provided at the center of the inner wall of the outer ring 5. A pair of elastic sealing rings 7 are also fixedly connected to the inner end of the outer ring 5, and the pair of elastic sealing rings 7 are respectively located on both sides of the liquid filling groove 501. A bubble removal chain 8 is provided inside the liquid filling groove 501. The inner wall of the liquid filling groove 501 is coated with a main magnetic coating 10 which is mutually adsorbed with the bubble removal chain 8. The inner wall of the liquid filling groove 501 is provided with a liquid injection hole 502 which communicates with the outside world.

[0042] The inner diameter of the elastic sealing ring 7 in the initial state is smaller than the inner diameter of the liquid filling groove 501, and the inner diameter of the liquid filling groove 501 is smaller than the inner diameter of the mounting ring 6. Figure 6 As shown, when the pipeline is fixed, the pipeline can be inserted into the detection box 1 from the sealing pipe hoop on one side and extended from the sealing pipe hoop on the other side, so that an interference fit is formed between the elastic sealing ring 7 and the pipeline to achieve preliminary sealing, and a cavity is formed between the pipe fitting and the liquid filling groove 501 for filling with phase change liquid. After the phase change liquid is solidified, a ring structure is formed and sleeved on the outside of the pipeline, and a secondary seal is formed between the pipeline, further improving the connection sealing between the sealing pipe hoop and the pipeline, so that the detection result is not easily changed due to poor sealing of the two.

[0043] See also Figure 4 and Figure 5 The bubble removal chain 8 includes a drawstring 801, the outer end of which is fixedly connected to a plurality of evenly distributed balls 802 coated with a secondary magnetic coating on the outer surface. One end of the drawstring 801 is fixedly connected to a guide rope ring 803, and the other end thereof movably passes through the inner side of the guide rope ring 803 and the inner wall of the liquid filling groove 501 until it extends to the outside of the outer ring 5. The end of the drawstring 801 located on the outer side of the outer ring 5 is fixedly connected to a ball head 804, and the inner wall of the liquid filling groove 501 is provided with a rope hole for the drawstring 801 to pass through. The inside of the rope hole is fixedly connected to a sealing sleeve 9, and the drawstring 801 is slidably connected to the inside of the sealing sleeve 9.

[0044] When the bubble removal chain 8 is not subjected to external force, the ball 802 is in a state of being closely attached to the inner wall of the liquid filling tank 501 (such as Figure 4 As shown in FIG. 5 ), after the phase change liquid is injected into the liquid filling groove 501, as shown in FIG. Figure 6 and Figure 7 By pulling the ball head 804, the pull rope 801 can be moved outward, driving the ball 802 to approach the surface of the pipeline. When the ball head 804 is released, under the action of magnetic attraction, the ball 802 approaches the inner wall of the liquid filling groove 501 again. In this way, the ball head 804 is repeatedly pulled to make the ball 802 fully stir the phase change liquid, effectively remove bubbles, and make the phase change liquid and the pipeline in close contact. After the phase change liquid solidifies, it can effectively form a sealed connection with the outer wall of the pipeline.

[0045] A pipeline joint sealing detection device, the use method of which comprises the following steps:

[0046] S1. Pipe fitting installation: insert the pipe fitting with the joint to be tested from the round through hole on one side of the detection box 1 and make it pass through the other side. The joint part on the pipe fitting is completely located inside the detection box 1;

[0047] S2. Sealing: Combination Figure 6 As shown, the sealing pipe clamps on both sides of the detection box 1 are respectively sleeved on both sides of the pipe joint, and the elastic sealing ring 7 forms a close contact with the outer wall of the pipe fitting to perform a preliminary fixed seal on it;

[0048] Then, a sufficient amount of heated and melted phase change liquid is injected into the liquid filling groove 501 through the liquid injection hole 502, and the ball head 804 is manually pulled repeatedly to reduce bubbles in the phase change liquid so that the phase change liquid is fully filled between the pipe fitting and the liquid filling groove 501;

[0049] After defoaming is completed, the phase change liquid is cooled and solidified, so that it is stored in a solid state between the pipeline and the liquid filling tank 501, and forms a surface sealing state with the two, which serves as a secondary seal between the outer wall of the pipeline. Fig. 9 The M in it represents the solidified phase change liquid;

[0050] S3. Detection: Inject gas into the double-port airbag 3 through the air injection tube 2 until the double-port airbag 3 is in an expanded state and then stop inflating. Then continue to record the air pressure detection data of the air pressure sensor 4. When the air pressure data remains unchanged, it indicates that the gas has not escaped into the pipe fitting through the pipe joint, and the sealing of the pipe joint is intact. When the air pressure data gradually decreases, it indicates that there is a possibility of gas escaping into the pipe fitting through the pipe joint, that is, there is a possibility of leakage at the pipe joint.

[0051] The phase change liquid is heated and melted paraffin, and the melting point of paraffin is 56°C. The cooling and solidification in step S2 can be carried out by static cooling or air cooling. In addition, after completing step S3, the solid paraffin can be heated externally, such as by hot air heating, to re-melt it, so that the pipeline can be easily removed from the detection box 1.

[0052] Second implementation method:

[0053] In this embodiment, while maintaining the same condition as in embodiment 1, ammonia is selected as the gas in step S3, and a test operation is also included between step S2 and step S3. The test operation includes the following process: Figure 8 and Fig. 9 , select two sections of bandages soaked in phenolphthalein solution, wrap them around the outer walls of the pipes on both sides of the detection box 1 respectively, to form a leak detection wet ring 11, and make the leak detection wet ring 11 in close contact with the elastic sealing ring 7.

[0054] Since phenolphthalein solution turns red when it encounters alkali, in step S3, when the air pressure data gradually decreases, first observe whether the two leak detection wet rings 11 turn red. When they do not turn red, it indicates that the connection between the sealing pipe clamp and the pipeline is well sealed and there is no ammonia leakage. The reduced ammonia escapes through the pipeline joint to a large extent, indicating that there may be a leakage at the pipeline joint. When any of the leak detection wet rings 11 turns red, it indicates that there is a leakage of ammonia at the connection between the sealing pipe clamp and the pipeline. This leakage will also cause the air pressure in the double-port airbag 3 to decrease, and it is impossible to determine whether there is a leakage at the pipeline joint. Therefore, the pipeline joint needs to be reinstalled and tested.

[0055] Therefore, in this embodiment, by adding the leak detection wet ring 11, the seal between the sealing pipe clamp and the pipeline can be simultaneously tested during the detection process, thereby further improving the accuracy of the pipeline joint sealing detection.

[0056] The third implementation method:

[0057] This embodiment adds the following structure based on the embodiment 1 or the embodiment 2: Fig.10 , Fig.11 and Fig.12 The outer end of the mounting ring 6 is fixedly connected with a bevel plate 12, and the inner wall of the round through hole is fixedly connected with a bevel sealing ring 13. The end of the bevel plate 12 away from the outer ring 5 and the inner end of the bevel sealing ring 13 respectively present mutually matching cross-sectional structures. A plurality of evenly distributed screw holes are provided on the bevel plate 12, and a pair of side ends of the detection box 1 are provided with a plurality of screw grooves, which correspond to the plurality of screw holes one by one, and a bolt 14 is threadedly connected between the two.

[0058] When performing step S1, the sealing pipe clamp and the detection box 1 are in an uninstalled state, which makes it convenient to insert the pipe into the detection box 1 from the round through hole. The sealing pipe clamp installation operation is also included between step S1 and step S2, and the sealing pipe clamp installation operation includes the following process: select a pair of sealing pipe clamps that are respectively matched with the outer diameters of the two ends of the pipe fitting, and insert the pair of sealing pipe clamps from the two ends of the pipe fitting respectively until they are in close contact with the inclined sealing ring 13, and the outer end of the pipe fitting and the inner end of the elastic sealing ring 7 are in an interference fit connection state, and then the sealing pipe clamp is fixed to the side end of the detection box 1 by the bolt 14.

[0059] Compared with the fixed connection method between the sealing pipe hoop and the round through hole in embodiment 1 or embodiment 2, this embodiment can be more convenient for the installation of the pipeline. At the same time, since the pipeline joint does not need to pass through the inner side of the elastic sealing ring 7, the damage to the elastic sealing ring 7 can be effectively reduced. In addition, by installing the pipeline first and then installing the sealing pipe hoop, it is possible to select a sealing pipe hoop with a suitable inner diameter according to the outer diameter of the pipeline for installation (the selection standard of the sealing pipe hoop is: the inner diameter of the elastic sealing ring 7 is slightly smaller than the outer diameter of the pipeline, so that it is convenient to put the sealing pipe hoop on both ends of the pipeline and form an interference fit with it), thereby effectively improving the adaptability of the present application.

[0060] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A pipeline joint sealing detection device, comprising a detection box (1), characterized in that: A double-port airbag (3) is provided inside the detection box (1), and two ports of the double-port airbag (3) are respectively fixedly connected to a pair of inner walls of the detection box (1); an air injection pipe (2) is fixedly connected to the upper end of the detection box (1); the lower end of the air injection pipe (2) is fixedly passed through the outer wall of the detection box (1) and the double-port airbag (3) and communicates with the inside of the double-port airbag (3); an air pressure sensor (4) located inside the double-port airbag (3) is fixedly connected to the inner wall of the detection box (1); a pair of side ends of the detection box (1) are each provided with a circular through hole, and the pair of circular through holes are respectively located on the inner sides of the two ports of the double-port airbag (3); and a pipe sealing hoop is installed inside the circular through hole; The sealing pipe clamp comprises an outer ring (5) and a mounting ring (6) which are fixedly connected to each other, the mounting ring (6) being located inside the round through hole, the outer ring (5) being located outside the detection box (1), a liquid filling groove (501) being provided at the center of the inner wall of the outer ring (5), a pair of elastic sealing rings (7) being fixedly connected to the inner end of the outer ring (5), and the pair of elastic sealing rings (7) being respectively located on both sides of the liquid filling groove (501), a bubble removal chain (8) being provided inside the liquid filling groove (501), the inner wall of the liquid filling groove (501) being coated with a main magnetic coating (10) which is mutually adsorbed with the bubble removal chain (8), and a liquid injection hole (502) communicating with the outside being provided on the inner wall of the liquid filling groove (501); The inner diameter of the elastic sealing ring (7) in the initial state is smaller than the inner diameter of the liquid filling groove (501), and the inner diameter of the liquid filling groove (501) is smaller than the inner diameter of the mounting ring (6). The pipe is inserted into the detection box (1) from the sealing pipe clamp on one side and extends out from the sealing pipe clamp on the other side. An interference fit is formed between the elastic sealing ring (7) and the pipe to achieve a preliminary seal. A cavity is formed between the pipe fitting and the liquid filling groove (501) for filling the phase change liquid after hot melting. After the phase change liquid is cooled and solidified, it forms an annular structure that is sleeved on the outside of the pipe and forms a secondary seal with the pipe.

2. A pipeline joint sealing detection device according to claim 1, characterized in that: The bubble removal chain (8) comprises a drawstring (801), the outer end of the drawstring (801) being fixedly connected to a plurality of evenly distributed balls (802) with an outer surface coated with a secondary magnetic coating, one end of the drawstring (801) being fixedly connected to a guide rope ring (803), and the other end of the drawstring (801) being movably connected to the inner side of the guide rope ring (803) and the inner wall of the liquid filling groove (501) until extending to the outside of the outer ring (5).

3. A pipeline joint sealing detection device according to claim 2, characterized in that: The end of the pull rope (801) located outside the outer ring (5) is fixedly connected to a ball head (804), the inner wall of the liquid filling groove (501) is provided with a rope hole for the pull rope (801) to pass through, the interior of the rope hole is fixedly connected to a sealing sleeve (9), and the pull rope (801) is slidably connected to the interior of the sealing sleeve (9).

4. A pipeline joint sealing detection device according to claim 3, characterized in that: The method of use includes the following steps: S1. Installation of pipe fittings: insert the pipe fitting to be tested with the joint into the round hole on one side of the test box (1) and pass it out from the other side, so that the joint part on the pipe fitting is completely located inside the test box (1); S2, sealing: the sealing clamps on both sides of the detection box (1) are respectively mounted on both sides of the pipe joint, and the elastic sealing ring (7) forms a close contact with the outer wall of the pipe fitting to perform a preliminary fixing and sealing operation; Then, a sufficient amount of heated and melted phase change liquid is injected into the liquid filling groove (501) through the liquid injection hole (502), and the ball head (804) is manually pulled repeatedly to reduce bubbles in the phase change liquid so that the phase change liquid is fully filled between the pipe fitting and the liquid filling groove (501); After defoaming is completed, the phase change liquid is cooled and solidified, so that it is stored in a solid state between the pipeline and the liquid filling tank (501), and forms a surface sealing state with the two, thereby serving as a secondary seal between the pipeline outer wall; S3. Detection: Inject gas into the double-port airbag (3) through the air injection pipe (2) until the double-port airbag (3) is in an expanded state and then stop inflating. Then, continuously record the air pressure detection data of the air pressure sensor (4). When the air pressure data remains unchanged, it indicates that the sealing of the pipe joint is intact. When the air pressure data gradually decreases, it indicates that there may be leakage at the pipe joint.

5. A pipeline joint sealing detection device according to claim 4, characterized in that: The phase change liquid is heated and melted paraffin, and the melting point of the paraffin is 52°C-58°C.

6. A pipeline joint sealing detection device according to claim 4, characterized in that: The gas in step S3 is ammonia gas, and a test operation is also included between step S2 and step S3, the test operation including the following process: selecting two sections of bandages soaked in phenolphthalein solution, wrapping them around the outer walls of the pipes on both sides of the detection box (1) to form a leak detection wet ring (11), and making the leak detection wet ring (11) in close contact with the elastic sealing ring (7); In step S3, when the air pressure data gradually decreases, first observe whether the two leak detection wet rings (11) have turned red. If they have not turned red, it indicates that there may be leakage at the pipe joint. If any of the leak detection wet rings (11) has turned red, the pipe joint needs to be reinstalled and tested.

7. The pipeline joint sealing detection device according to claim 4 is characterized in that: The outer end of the mounting ring (6) is fixedly connected to a bevel plate (12), the inner wall of the round through hole is fixedly connected to a bevel sealing ring (13), and the end of the bevel plate (12) away from the outer ring (5) and the inner end of the bevel sealing ring (13) respectively present mutually matching cross-sectional structures.

8. A pipeline joint sealing detection device according to claim 7, characterized in that: The inclined panel (12) is provided with a plurality of evenly distributed screw holes, and a pair of side ends of the detection box (1) are provided with a plurality of screw grooves, the plurality of screw grooves respectively correspond to the plurality of screw holes one by one, and bolts (14) are threadedly connected between the two.

9. A pipeline joint sealing detection device according to claim 8, characterized in that: When performing step S1, the sealing pipe clamp and the detection box (1) are in an unmounted state. Between step S1 and step S2, a sealing pipe clamp installation operation is also included. The sealing pipe clamp installation operation includes the following process: selecting a pair of sealing pipe clamps respectively matching the outer diameters of the two ends of the pipe fitting, inserting the pair of sealing pipe clamps from the two ends of the pipe fitting respectively until they are in close contact with the inclined sealing ring (13), and the outer end of the pipe fitting and the inner end of the elastic sealing ring (7) are in an interference fit connection state, and then fixing the sealing pipe clamp to the side end of the detection box (1) by means of bolts (14).

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