Sealing connection kit for ultrasonic detection of pipes

Abstract

The invention relates to the technical field of ultrasonic flaw detection equipment for pipes, and particularly discloses a sealing connection kit for ultrasonic detection of pipes. The connecting kit is used for connecting a plurality of to-be-tested pipes to form a to-be-tested pipe group and sealing the to-be-tested pipe group, and comprises an end sealing kit and a middle sealing kit. Wherein the two groups of end sealing kits are respectively arranged at the two ends of the to-be-tested pipe group so as to seal the two ends of the to-be-tested pipe group. And the middle sealing kit is arranged between two adjacent pipes to be tested and is used for sealing and connecting the two adjacent pipes to be tested. According to the invention, the whole to-be-detected pipe group formed by connection has good sealing performance so as to adapt to the use environment of water immersion ultrasonic detection; and meanwhile, no bulge is generated on the outer surface of the connected to-be-detected pipe group, so that the to-be-detected pipe group can smoothly and axially move to pass through a probe in ultrasonic detection equipment without being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic flaw detection equipment for pipes, and in particular to a sealing connection kit for ultrasonic detection of pipes. Background Art

[0002] Ultrasonic testing is a conventional non-destructive testing technology. It is widely used in the field of pipe testing to detect defects inside and on the surface of pipes, such as cracks, delamination, inclusions, etc. Among them, water immersion ultrasonic testing is one of the commonly used pipe ultrasonic testing methods.

[0003] Water immersion ultrasonic testing mainly uses water as a coupling agent for ultrasonic testing. During testing, the outer surface of the tested pipe needs to be immersed in water, and the conductive properties of water are used to realize the propagation of ultrasonic waves in the pipe. The ultrasonic waves propagate in the workpiece and interact with the workpiece material and the defects therein. The defects will change the propagation direction or characteristics of the ultrasonic waves, that is, the ultrasonic waves will be reflected, refracted or scattered. The changed ultrasonic waves are received by the testing equipment, and according to the characteristics of the received ultrasonic waves, relevant evaluation can be made on whether the pipe has defects. This detection method is widely used in the field of ultrasonic testing of pipes due to its advantages of high sensitivity, high resolution and fast speed.

[0004] Due to the limitation of automatic ultrasonic flaw detection equipment, the shortest length of ultrasonic flaw detection pipes must be ≥2m. Therefore, for ultrasonic flaw detection of pipes with a length of less than 2m, it is usually necessary to extend the pipes to form a pipe group before ultrasonic flaw detection. There are two main types of commonly used pipe connection methods. One is mechanical connection. For example, the invention of "A polyethylene pipe connection kit structure" with publication number CN 220792435U discloses a polyethylene pipe connection kit structure, which adds a connection kit, a movable kit and a clamp on the outer surface of the pipe. The connection kit and the movable kit are connected by external and internal threads. The clamp is driven to move by rotating the movable kit, so that the wedge block on the clamp is inserted into the wedge groove, that is, the clamp extrudes the outer wall of the pipe, thereby completing the fixed connection of the pipe; the other type is a thermal processing connection method using methods such as hot melting, electric melting, and welding.

[0005] When using automatic ultrasonic equipment for ultrasonic flaw detection of pipes, the probe is usually stationary, while the two ends of the pipe rotate at a constant speed while moving axially. Therefore, the pipes are required to have a certain bonding strength after connection to ensure good straightness after connection, and there should be no protrusions on the surface that affect the axial and circumferential movement of the pipes. Therefore, the joints of the pipe group after mechanical connection will limit the movement of the probe of the automatic ultrasonic equipment, causing inconvenience to the ultrasonic flaw detection work.

[0006] However, the hot working connection method will cause damage to the pipe, and the heating step in the hot working connection process will easily lead to a difference in magnetic permeability between the connection and the rest of the parts, which will cause abnormal ultrasonic signals. In addition, for thin-walled pipes, hot working connection operations are extremely difficult, which limits the use of hot working connections. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a sealing connection kit for ultrasonic testing of pipes, which can be suitable for connecting pipes of various sizes to be tested, and after connection, it can ensure that there are no protrusions on the outer surface of the pipe group to be tested that affect the axial and circumferential movement of the pipe, and that the pipe group to be tested has good sealing as a whole, so as to prevent water from penetrating into the inner cavity of the pipe during water immersion ultrasonic testing and affecting the test results.

[0008] The present invention is achieved through the following technical solutions: A sealing connection kit for ultrasonic testing of pipes, used for connecting a plurality of pipes to be tested to form a pipe group to be tested, and sealing the pipe group to be tested, comprising: an end sealing kit, comprising a limiting portion and a first sealing block connected to the limiting portion, when the pipe group to be tested is tested, two sets of the end sealing kits are respectively installed at the two ends of the pipe group to be tested, wherein the first sealing block is embedded in the port of the pipe group to be tested, so that the limiting portion and the two ends of the pipe group to be tested are tightly in contact with each other, thereby sealing the two ends of the pipe group to be tested; an intermediate sealing kit, comprising second sealing blocks arranged at the two ends, when the pipe group to be tested is tested, the intermediate sealing kit is arranged between two adjacent pipes to be tested, the second sealing blocks at the two ends are respectively embedded in the ports of the adjacent pipes to be tested, the outer wall of the second sealing block is in contact with the inner wall of the port of the pipe to be tested, and is used for sealing and connecting the two adjacent pipes to be tested.

[0009] The sealing connection kit in the present invention can use the end sealing kit to seal the two ends of the pipe group to be tested to ensure that coupling agents such as water will not penetrate into the pipe group to be tested; at the same time, the middle sealing kit can be used to complete the connection of two adjacent pipes to be tested and ensure a sealing effect between the two pipes to be tested. At the same time, no protrusions will be formed on the outer surface of the pipe group to be tested after the connection, so that the pipe group to be tested can smoothly pass through the probe in the ultrasonic detection equipment.

[0010] As a further improvement of the present invention, a sealing structure is provided on the outer wall of the first sealing block and the second sealing block, so as to further ensure the sealing effect on the pipe group to be tested.

[0011] As a further improvement of the present invention, the sealing structure includes a plurality of sealing annular structures continuously arranged along the radial direction of the tube group to be tested.

[0012] As a further improvement of the present invention, the intermediate sealing kit further includes a convex ring structure arranged between two groups of the second sealing blocks, and the outer diameter of the convex ring structure is smaller than the outer diameter of the pipe to be tested and larger than the inner diameter of the pipe to be tested.

[0013] The convex ring structure can collide with the ports of two adjacent pipes to be tested. On the one hand, it has a limiting effect on the connection of the two adjacent pipes to be tested, ensuring that the pipes to be tested are connected in place; on the other hand, the ports of the pipes to be tested collide with the convex ring structure to form a new anti-seepage structure, further ensuring that coupling agents such as water will not penetrate into the pipe group to be tested.

[0014] As a further improvement of the present invention, the outer diameter of the limit portion is smaller than the outer diameter of the pipe to be tested, ensuring that the probe of the automatic ultrasonic equipment can be smoothly mounted on the pipe group to be tested at the beginning of the ultrasonic test, and can be smoothly separated from the pipe group to be tested after the ultrasonic test is completed, further ensuring the smooth progress of the ultrasonic test process.

[0015] As a further improvement of the present invention, it also includes a main body core, the outer diameter of the main body core is smaller than the inner diameter of the pipe to be tested, and the length is longer than the length of the pipe to be tested. When the pipe group to be tested is tested, the main body core is placed in the cavity of a plurality of the pipes to be tested to provide support for the pipe group to be tested; the end sealing kit and the middle sealing kit are provided with mounting through holes adapted to the main body core. When the pipe group to be tested is tested, the end sealing kit and the middle sealing kit are both sleeved and installed on the main body core.

[0016] The main body core can provide support for the pipe group to be tested to ensure that the pipe group to be tested has good straightness as a whole. Therefore, during the ultrasonic testing process, the pipe group to be tested keeps rotating at a constant speed and does not conflict with the probe when moving axially, ensuring the smooth progress of the ultrasonic testing work.

[0017] As a further improvement of the present invention, the two ends of the main body core are provided with tube end fastening kits to drive the limiter to fit and contact the two ends of the tube group to be tested. The tube end fastening kit can drive the end sealing kit and the middle sealing kit to fit tightly with the tube to be tested, ensuring that the overall sealing of the tube group to be tested is good, and further ensuring that the coupling agent (water) will not leak into the inner cavity of the tube group to be tested during the water immersion ultrasonic testing process and affect the ultrasonic testing results.

[0018] As a further improvement of the present invention, the pipe end fastening kit includes threads arranged at both ends of the main core and nuts adapted to the threads. When fastening, the nut conflicts with a side of the limit portion away from the port of the pipe group to be tested.

[0019] As a further improvement of the present invention, the pipe end fastening kit further includes a gasket, which is placed between the nut and the limiting portion during the fastening operation. The gasket can evenly disperse the extrusion force exerted by the nut on the limiting portion, especially still maintain a certain extrusion force on the edge of the limiting portion, so that the limiting portion as a whole is tightly in contact with the port of the pipe group to be tested, thereby ensuring the sealing effect on the pipe group to be tested.

[0020] As a further improvement of the present invention, the pipe end fastening kit further includes an elastic washer, which is placed between the nut and the gasket during the fastening operation. The elastic washer can serve as a buffer layer to absorb the impact and vibration generated during the ultrasonic testing process, ensuring that the nut will not be affected by the impact and deflect away from the limit portion; at the same time, the elastic washer has a sealing effect, especially reducing the possibility of water or other coupling agents penetrating from both ends of the pipe group to be tested when there is a gap between the nut and the thread.

[0021] As a further improvement of the present invention, the end sealing kit and the middle sealing kit are made of polytetrafluoroethylene or PA6 nylon.

[0022] The beneficial effect of the present invention is that the sealing connection kit can realize the connection of multiple pipes to be tested and ensure that the pipe group to be tested formed by the connection has good sealing performance as a whole, and can adapt to the use environment of water immersion ultrasonic testing; at the same time, no bulges are generated on the outer surface of the connected pipe group to be tested, ensuring that the pipe group to be tested can smoothly pass through the probe in the ultrasonic testing equipment. After the main body core is provided, it can provide support for the pipe group to be tested, ensuring that the pipe group to be tested maintains good straightness as a whole, and at the same time, the pipe end fastening kits provided at both ends of the main body core further ensure that the connection between the pipes to be tested is tight and the overall sealing performance of the pipe group to be tested is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following drawings are provided for combining with the preferred implementation examples of the present invention to help understand the purpose and advantages of the present invention, wherein: Figure 1 This is a schematic diagram of the cross-sectional structure of the sealing connection kit for ultrasonic testing of pipes in Example 1 after installation; Figure 2 This is a schematic diagram of the cross-sectional structure of the sealing connection kit for ultrasonic testing of pipes in Example 2 after installation; Figure 3Schematic diagram of the ultrasonic testing process of the pipe group to be tested in Example 2. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below based on the accompanying drawings and implementation examples.

[0025] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0026] In this embodiment, the size specification of the pipe A01 to be tested is φ19×0.8 mm, and the pipe group A to be tested includes two pipes A01 to be tested.

[0027] Embodiment 1: In this embodiment, Figure 1 As shown, it includes two sets of end sealing kits 1 and one set of middle sealing kits 2, wherein the second sealing blocks 201 at both ends of the middle sealing kit 2 are respectively embedded in the respective ports of two adjacent pipes A01 to be tested, so that the two pipes A01 to be tested are connected to form a pipe group A to be tested and the connection has good sealing performance. The two sets of end sealing kits 1 are respectively installed at the two ends of the pipe group A to be tested, and the first sealing blocks 102 thereon are embedded in the two ports of the pipe group A to be tested, and the limiting part 101 is tightly fitted with the two ports of the pipe group A to be tested, so as to achieve a good sealing of the pipe group A to be tested as a whole.

[0028] Preferably, a sealing structure is provided on the outer wall of the first sealing block 102 and the second sealing block 201. In this embodiment, the sealing structure is 10 sealing annular structures continuously provided along the radial direction of the pipe group A to be tested.

[0029] Preferably, the intermediate sealing kit 2 also includes a convex ring structure 202. When two adjacent pipes A01 to be tested are connected, the convex ring structure 202 contacts the port of the pipe A01 to be tested, and plays a role in limiting the position of the pipe A01 to be tested. The size of the convex ring structure 202 is an outer diameter of φ18 mm, so after the pipes A01 to be tested are connected, no convexity is formed on the surface of the pipe group A to be tested to block the axial movement of the pipe group A to be tested.

[0030] Preferably, in this embodiment, the size specification of the limit portion 101 is an outer diameter of φ18 mm, which is also smaller than the outer diameter of the pipe A01 to be tested, ensuring that the probe of the automatic ultrasonic equipment can be smoothly mounted on the pipe group A to be tested from the outside at the beginning of the ultrasonic test; and can be smoothly detached from the pipe group A to be tested after the ultrasonic test is completed, further ensuring the smooth progress of the ultrasonic test process.

[0031] Preferably, in this embodiment, the end sealing kit 1 and the middle sealing kit 2 are made of polytetrafluoroethylene. On the one hand, this material can achieve a close fit between the inner wall of the pipe A01 to be tested after it comes into contact with the inner wall of the pipe A01 to be tested, thereby ensuring the sealing effect; on the other hand, this material will not affect the ultrasonic spectrum of the pipe A01 to be tested, thereby ensuring that it will not affect the ultrasonic detection work of the pipe A01 to be tested.

[0032] Embodiment 2: The difference between this embodiment and embodiment 1 is that this embodiment includes a main body core 3 with a size of φ9.5 mm. Figure 2 As shown, the main body core 3 extends into the inner cavities of the two pipes A01 to be tested at the same time to provide support for the pipe group A to be tested as a whole.

[0033] In this embodiment, both the end sealing kit 1 and the middle sealing kit 2 are sleeved on the main body core 3 through the installation through hole. Among them, the two sets of end sealing kits 1 are sleeved on the two ends of the main body core 3 respectively, and the first sealing block 102 thereon is embedded between the inner wall at the two ends of the pipe group A to be tested and the outer wall of the main body core 3, and the limit part 101 is tightly in contact with the two ends of the pipe group A to be tested. In this embodiment, the middle sealing kit 2 is sleeved on the middle section of the main body core 3, and the second sealing blocks 201 at both ends thereof are respectively embedded between the inner wall at the respective ends of the two adjacent pipes A01 to be tested and the outer wall of the main body core 3, and the convex ring structure 202 thereon is in contact with the port of the pipe A01 to be tested, so as to achieve a sealing effect on the connection.

[0034] Preferably, a tube end fastening kit 4 is also provided at both ends of the main body core 3, and the tube end fastening kit 4 includes a thread provided on the main body core 3, a nut 401 that can be screwed on the thread, a gasket 402 and an elastic gasket 403. In this embodiment, gaskets 402, elastic gaskets 403 and nuts 401 are sequentially arranged from the limiting portion 101 along the radial direction of the pipe group A to be tested, that is, the nut 401 is in conflict with the limiting portion 101 through the elastic gasket 403 and the gasket 402, so as to achieve the effect of driving the limiting portion 101 to be close to the port of the pipe group A to be tested. At the same time, the tube end fastening kit 4 can also drive the pipe A01 to be tested to conflict with the convex ring structure 202, so that the connection between the two adjacent pipes A01 to be tested is tight, ensuring that the overall sealing effect of the pipe group A to be tested is good.

[0035] In this embodiment, the water immersion ultrasonic detection device used is as follows Figure 3 As shown, the axial movement path of the pipe group A to be tested includes a first driving part α1, an ultrasonic detection part β and a second driving part α2 in sequence, wherein the first driving part α1 and the second driving part α2 are both used to drive the pipe group A to be tested to rotate at a constant speed while moving axially to pass through the ultrasonic detection part β, wherein the ultrasonic detection part β includes a fixed probe and a coupling agent (water).

[0036] During the detection process of the water immersion ultrasonic detection device in this embodiment, there is a process in which the head of the pipe group A to be tested enters the coupling agent and the tail leaves the coupling agent. In this process, the coupling agent is disturbed, causing the ultrasonic propagation path to change, thereby making it difficult for the pipe group A to be tested to be properly ultrasonically detected during this period of time, that is, a detection blind area is generated at the front and rear ends of the pipe group to be tested. At the same time, if there is a protrusion or other structure that will conflict with the probe at the connection between the two pipes to be tested, it will also cause the interruption of the ultrasonic detection step, thereby forcing the adjacent ports of the two pipes to be tested to form a detection blind area.

[0037] Since there are hidden dangers in the quality of some pipes in the blind area of ​​the test pipe group A, in order to ensure the quality of the pipes, for small-diameter pipes that are extremely difficult to perform manual ultrasonic testing on the pipe ends, most companies usually directly cut off the blind area of ​​the pipe ends. However, such operations will cause waste of resources and increase the production costs of the company.

[0038] In this embodiment, on the one hand, no protrusions are generated on the outer surface of the connected test pipe group A, thus ensuring that the adjacent ports on the two test pipes A01 can participate in the ultrasonic detection normally, and no detection blind area will be generated here. On the other hand, this embodiment includes a main body core 3, and the length of the main body core 3 exceeds the length of the test pipe group A, so the part of the main body core 3 that exceeds the length of the test pipe group A can be regarded as the extension of the two ends of the test pipe group A. This makes it so that in the detection blind area generated when the test pipe group A first enters and leaves the ultrasonic detection part β, only the two ends of the main body core 3 are included, that is, when the test pipe A01 contacts the probe, the test pipe A01 can already participate in the ultrasonic detection normally, which ensures that the entirety of the two test pipes A01 can participate in the ultrasonic detection normally.

[0039] The above structures cooperate with each other to avoid the need to cut off the detection blind area of ​​the pipe end, greatly reducing the waste of pipes and reducing the production costs of the enterprise.

[0040] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned implementation cases, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A sealing connection kit for ultrasonic testing of pipes, used for connecting a plurality of pipes to be tested (A01) to form a pipe group to be tested (A), and sealing the pipe group to be tested (A), characterized in that: Contains: An end sealing kit (1) comprises a limiting portion (101) and a first sealing block (102) connected to the limiting portion (101); when the pipe group (A) to be tested is tested, two sets of the end sealing kits (1) are respectively installed at the two ends of the pipe group (A) to be tested, wherein the first sealing block (102) is embedded in the port of the pipe group (A) to be tested, so that the limiting portion (101) is in close contact with the two ends of the pipe group (A) to be tested, thereby achieving sealing of the two ends of the pipe group (A) to be tested; The intermediate sealing kit (2) comprises second sealing blocks (201) arranged at both ends. When the test pipe group (A) is tested, the intermediate sealing kit (2) is arranged between two adjacent test pipes (A01). The second sealing blocks (201) at both ends are respectively embedded in the ports of the adjacent test pipes (A01). The outer wall of the second sealing block (201) fits with the inner wall of the port of the test pipe (A01), so as to achieve sealing and connection between the two adjacent test pipes (A01).

2. A sealing connection kit for ultrasonic testing of pipes according to claim 1, characterized in that: Sealing structures are provided on the outer walls of the first sealing block (102) and the second sealing block (201).

3. A sealing connection kit for ultrasonic testing of pipes according to claim 2, characterized in that: The sealing structure comprises a plurality of sealing annular structures which are continuously arranged along the radial direction of the pipe group (A) to be tested.

4. The sealing connection kit for ultrasonic testing of pipes according to claim 1, characterized in that: The intermediate sealing kit (2) further comprises a convex ring structure (202) arranged between two sets of the second sealing blocks (201), wherein the outer diameter of the convex ring structure (202) is smaller than the outer diameter of the pipe to be tested (A01) and larger than the inner diameter of the pipe to be tested (A01).

5. The sealing connection kit for ultrasonic testing of pipes according to claim 1, characterized in that: The outer diameter of the limiting portion (101) is smaller than the outer diameter of the pipe (A01) to be tested.

6. A sealing connection kit for ultrasonic testing of pipes according to any one of claims 1 to 5, characterized in that: It also comprises a main body core (3), the outer diameter of the main body core (3) being smaller than the inner diameter of the pipe to be tested (A01), and the length of the main body core (3) being longer than the length of the pipe to be tested (A01); when the pipe group (A) to be tested is tested, the main body core (3) is placed in the cavity of a plurality of pipes to be tested (A01) to provide support for the pipe group (A) to be tested; The end sealing kit (1) and the middle sealing kit (2) are provided with mounting through holes that are compatible with the main body core (3); when the pipe group (A) to be tested is tested, the end sealing kit (1) and the middle sealing kit (2) are both sleeved and mounted on the main body core (3).

7. A sealing connection kit for ultrasonic testing of pipes according to claim 6, characterized in that: Both ends of the main body core (3) are provided with pipe end fastening sets (4) to drive the limiting portion (101) to fit and contact with both ends of the pipe group (A) to be tested.

8. The sealing connection kit for ultrasonic testing of pipes according to claim 7, characterized in that: The pipe end fastening kit (4) comprises threads arranged at both ends of the main body core (3) and nuts (401) adapted to the threads. When fastening is performed, the nuts (401) come into contact with a side of the limiting portion (101) away from the port of the pipe group (A) to be tested.

9. A sealing connection kit for ultrasonic testing of pipes according to claim 8, characterized in that: The pipe end fastening kit (4) further comprises a gasket (402). When the fastening work is performed, the gasket (402) is placed between the nut (401) and the limiting portion (101).

10. A sealing connection kit for ultrasonic testing of pipes according to claim 9, characterized in that: The pipe end fastening kit (4) further comprises an elastic washer (403). When the fastening work is performed, the elastic washer (403) is placed between the nut (401) and the gasket (402).

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