A test fixture and a test device

Abstract

This application provides a test fixture and test apparatus, relating to the field of buried pipeline damage testing technology. The test fixture includes a first outer shell, a second outer shell, a connecting assembly, and a conductive element, which are sequentially connected. By placing the workpiece to be clamped in the accommodating cavity formed by the first and second outer shells, the surface of the workpiece located in the accommodating cavity will not react, thus improving the sealing of the non-test surface of the workpiece. By connecting the conductive element to at least part of the connecting assembly and making it electrically conductive, and by connecting it to an external power source, the conductive element receives power from the external power source during the test and applies voltage to the workpiece through the connecting assembly, simulating the service environment of the pipeline. By exposing one outer surface of the workpiece to be clamped at the opening of the first outer shell, only the outer surface of the workpiece exposed at the opening reacts during the test, facilitating statistical analysis in the later stages of the test and improving the test accuracy of the test apparatus.

Description

Technical Field

[0001] The present application relates to the technical field of buried pipeline damage testing, and in particular to a testing fixture and a testing device. Background Art

[0002] With the advancement of science and technology, the oil and gas transportation system and the high-voltage direct current transmission system have developed rapidly. However, due to the limitations of on-site conditions, the oil and gas pipelines and the high-voltage direct current transmission lines may overlap or cross each other, causing the operation of the high-voltage direct current transmission system to affect the oil and gas pipelines. When a high-voltage direct current transmission system fails, the grounding electrode will release a discharge current of kiloamperes, and the potential on the oil and gas pipeline will shift significantly. As a result, there will be serious local discharge between the pipeline and the soil, causing damage to the pipeline.

[0003] In the prior art, in order to solve the problem of voltage interference in oil and gas pipelines caused by faults in high-voltage direct current transmission, test prediction is usually carried out to evaluate the potential impact and take corresponding measures. The existing test device includes a soil box, a test sample, a high-power direct current power supply, a data recorder, a timer switch, a conductor, a fixed resistor and an auxiliary electrode. The power supply applies voltage to the test sample exposed in the soil box to simulate the actual service conditions of the oil and gas pipeline.

[0004] However, the existing test device has the problem of poor clamping of the test sample and thus low reliability of the test result of the test sample. Utility Model Content

[0005] The present application provides a test fixture and a test device, which improve the clamping firmness of the test fixture, improve the sealing performance of the test fixture to the non-test surface of the clamped part, simulate the actual service environment of the pipeline, and improve the test accuracy of the test device.

[0006] In a first aspect, the present application provides a test fixture, comprising a first shell, a second shell, a connection assembly and a conductive member; the first shell, the second shell and the connection assembly are connected in sequence.

[0007] A receiving cavity for placing the clamped part is formed between the first shell and the second shell, and an opening communicating with the receiving cavity is provided on the first shell; the conductive member is connected to at least part of the connecting component and is electrically conductive, and is used to be electrically connected to an external power source.

[0008] When the part to be clamped is located in the accommodating cavity, one side outer surface of the part to be clamped is exposed to the opening; the part to be clamped is connected to a part of the connecting assembly and is electrically conductive.

[0009] In the above test fixture, optionally, the first shell has a first cavity, and the opening is connected to the first cavity; at least part of the second shell extends into the first cavity, and the second shell located in the first cavity and the inner wall of the first shell together form a accommodating cavity.

[0010] The part to be clamped includes a test section and a connecting section connected to each other. When the part to be clamped is located in the accommodating cavity, the test section is located in the opening, a side of the test section facing away from the accommodating cavity is exposed through the opening, and the connecting section is located in the accommodating cavity.

[0011] In the above-mentioned test fixture, optionally, the second shell has a protrusion, and the protrusion extends into the first cavity; when the to-be-clamped member is located in the accommodating cavity, the protrusion abuts against a side of the to-be-clamped member close to the second shell.

[0012] In the above test fixture, optionally, the second shell has a second cavity, and the second cavity runs through the second shell along the direction in which the first shell, the second shell and the connecting assembly are sequentially connected.

[0013] At least part of the connecting assembly passes through the second housing and extends into the first cavity; when the part to be clamped is located in the accommodating cavity, part of the connecting assembly extending into the first cavity is connected to the part to be clamped and is electrically conductive.

[0014] In the above-mentioned test fixture, optionally, the connection assembly includes a connection head, a connection rod and a nut, the connection head has a connection cavity, and at least parts of the connection rod, the nut and the conductive member are all located in the connection cavity.

[0015] A connecting opening which is communicated with the connecting cavity is provided on one side of the connecting head close to the second shell, and at least a part of the nut is fixedly installed at the connecting opening.

[0016] The connecting rod passes through the connecting opening and is threadedly connected with the nut; at least a part of the connecting rod passes through the second cavity and extends into the first cavity.

[0017] When the to-be-clamped member is located in the accommodating cavity, the connecting rod extending into the first cavity is connected to the to-be-clamped member and is electrically conductive.

[0018] In the above test fixture, optionally, the connection cavity is filled with an insulating packaging member, and the insulating packaging member covers and packages the connection rod and a portion of the conductive member located in the connection cavity.

[0019] In the above-mentioned test fixture, optionally, it also includes an insulating shell, which is coated on the outside of the conductive part and fixedly connected to the insulating packaging part.

[0020] In the above test fixture, optionally, the connector and the second shell are connected to each other, and the connection points between the connector and the second shell are distributed around the periphery of the second cavity.

[0021] And / or, the first shell and the second shell are connected to each other, and the connection points between the first shell and the second shell are distributed around the periphery of the first cavity.

[0022] In the above test fixture, optionally, it further includes a sealing member, and there are multiple sealing members, which are respectively arranged at the connection between the first shell and the second shell, and at the connection between the second shell and the connector.

[0023] In the second aspect, the present application provides a test device, including a box, a filling medium, an external power supply, a wire, an auxiliary electrode and the above-mentioned test fixture, the filling medium is located in the cavity of the box, the auxiliary electrode and the test fixture are both located in the filling medium, and the two levels of the external power supply are respectively connected to the auxiliary electrode and the test fixture through wires.

[0024] The present application provides a test fixture and a test device, the test fixture comprises a first shell, a second shell, a connecting assembly and a conductive member, wherein the first shell, the second shell and the connecting assembly are connected in sequence, a receiving cavity for placing a to-be-clamped member is formed between the first shell and the second shell, and an opening communicating with the receiving cavity is provided on the first shell; by providing the first shell and the second shell, and placing the to-be-clamped member in the receiving cavity, the surface of the to-be-clamped member located in the receiving cavity will not react, thereby improving the sealing of the non-test surface of the to-be-clamped member, and at the same time, improving the clamping of the to-be-clamped member by the test fixture Firmness; by connecting the conductive part to at least part of the connecting component and electrically conducting it, and electrically connecting it to an external power supply, during the test, the conductive part can receive power supply from the external power supply, provide the required power to the connecting component, and then provide voltage to the part to be clamped, simulating the service environment of the pipeline; when the part to be clamped is located in the accommodating cavity, by exposing one side of the outer surface of the part to be clamped to the opening, during the test of the part to be clamped, only the side exposed to the opening reacts, which is convenient for statistical analysis in the later stage of the test; the test device includes the above-mentioned test fixture, which improves the test accuracy of the test device.

[0025] The structure of the present application and its other practical purposes and beneficial effects will be more clearly understood through the description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0027] Figure 1 A schematic diagram of the structure of the test fixture provided in the embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a part to be clamped by a test fixture provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the structure of a first shell of a test fixture provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the structure of a second housing of a test fixture provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of a connector of a test fixture provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of the structure of the test device provided in the embodiment of the present application.

[0033] Description of reference numerals:

[0034] 100: first housing; 110: first cavity; 120: first housing groove;

[0035] 200: second housing; 210: second cavity; 220: protrusion; 230: second housing groove; 240: first connection groove;

[0036] 300: connecting assembly; 310: connecting head; 320: connecting rod; 330: nut; 340: second connecting groove;

[0037] 400: conductive parts;

[0038] 500: part to be clamped; 510: test section; 520: connection section; 530: groove;

[0039] 600: Insulation packaging;

[0040] 700: Insulation housing;

[0041] 800: box; 810: filling medium; 820: external power supply; 830: wire; 840: auxiliary electrode.

[0042] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0044] The inventors of this application discovered during actual research that my country's high-voltage direct current transmission projects generally adopt a bipolar balanced operation mode, and the grounding electrode current is basically zero. However, under conditions of equipment failure or natural disasters, the single pole is locked, and the grounding electrode will release thousands of amperes of current into the ground, forming a large-scale DC voltage field in the soil, which interferes with oil and gas pipelines. Under the condition of extremely large grounding current discharge, there is a large potential offset on the pipeline. The excessive interference voltage generated by the pipeline will cause serious local discharge between the locally damaged area of ​​the outer anti-corrosion layer and the soil, resulting in the risk of ablation of the anti-corrosion layer.

[0045] Simulating different interference voltages, interference durations and interference interval conditions during high-voltage DC discharge and testing the changes in the pipeline anti-corrosion layer can provide a theoretical basis for the ablation risk assessment of the pipeline's external anti-corrosion layer and the control range of high-voltage DC discharge, which has important practical significance.

[0046] In the prior art, in order to solve the problem of voltage release from high-voltage direct current transmission interfering with oil and gas pipelines due to faults, test predictions are usually conducted to evaluate the potential impact and take corresponding measures. The existing test device includes a soil box, a test sample, a high-power direct current power supply, a data recorder, a timer switch, a conductor, a fixed resistor and an auxiliary electrode. The power supply applies voltage to the test sample exposed in the soil box to simulate the actual service conditions of the oil and gas pipeline. The existing test device often clamps the test sample in a fixed position of the test device by bolts or clamping devices to ensure that it will not move or fall off during the test.

[0047] However, the existing test device only considers the firmness of the test sample in the test device, and does not consider the actual position of the test sample to be reacted. The test sample is completely exposed to the soil. During the test, all surfaces of the test sample may corrode, but the actual calculation process does not consider the situation of all corrosion surfaces of the test sample, or it cannot completely count all corrosion surfaces of the test sample, which may lead to large deviations in the corrosion rate calculation results. Therefore, the existing test device has the problem of poor clamping position of the test sample and low reliability of the test sample test results.

[0048] In view of this, an embodiment of the present application provides a test fixture and a test device, wherein the test fixture includes a first shell, a second shell, a connecting component and a conductive member, wherein the first shell, the second shell and the connecting component are connected in sequence, a receiving cavity for placing a part to be clamped is formed between the first shell and the second shell, and an opening communicating with the receiving cavity is provided on the first shell; by providing the first shell and the second shell, and placing the part to be clamped in the receiving cavity, the surface of the part to be clamped in the receiving cavity will not react, thereby improving the sealing of the non-test surface of the part to be clamped, and at the same time, improving the test fixture to the part to be clamped The clamping firmness is improved; by connecting the conductive member to at least part of the connecting assembly and electrically conducting the conductive member, and electrically connecting the conductive member to an external power source, during the test, the conductive member can receive power supply from the external power source, provide the required power to the connecting assembly, and then provide voltage to the member to be clamped, thereby simulating the service environment of the pipeline; when the member to be clamped is located in the accommodating cavity, by exposing one side of the outer surface of the member to be clamped to the opening, during the test of the member to be clamped, only the side exposed to the opening reacts, which is convenient for statistical analysis in the later stage of the test; the test device includes the above-mentioned test fixture, which improves the test accuracy of the test device.

[0049] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0050] First, refer to Figures 1 to 5 As shown, the present application provides a test fixture, including a first housing 100, a second housing 200, a connecting assembly 300 and a conductive member 400; the first housing 100, the second housing 200 and the connecting assembly 300 are connected in sequence.

[0051] A receiving cavity for placing the clamped part 500 is formed between the first shell 100 and the second shell 200, and an opening communicating with the receiving cavity is provided on the first shell 100; the conductive member 400 is connected to at least part of the connecting component 300 and is electrically conductive, and is used to be electrically connected to an external power source 820.

[0052] When the member to be clamped 500 is located in the accommodating cavity, one side outer surface of the member to be clamped 500 is exposed to the opening; the member to be clamped 500 is connected to a part of the connecting assembly 300 and is electrically conductive.

[0053] For example, refer to Figure 1As shown, during the test of the part to be clamped 500, the part to be clamped 500 is first placed in the accommodating cavity formed by the first shell 100 and the second shell 200. By placing the part to be clamped 500 in the accommodating cavity formed by the first shell 100 and the second shell 200, and exposing one side of the outer surface of the part to be clamped 500 to the opening, when the test fixture clamps the part to be clamped 500 for testing, only the side of the part to be clamped 500 exposed to the opening will react, and the other sides of the part to be clamped 500 located in the accommodating cavity will not react. On the one hand, the sealing performance of the test fixture to the part to be clamped 500 is improved, avoiding unnecessary reactions; on the other hand, it is convenient for the collection and analysis of later information, and improves the accuracy of the test of the part to be clamped 500. In addition, the part to be clamped 500 is located in the accommodating cavity, and the accommodating cavity can limit the part to be clamped 500, limiting the movement of the part to be clamped 500 along the accommodating cavity. Figure 1 The movement in the X and Y directions shown limits the position of the part 500 to be clamped during the test, thereby improving the stability of the part 500 to be clamped.

[0054] For example, by connecting the conductive member 400 and the external power supply 820, the conductive member 400 is connected to at least a portion of the connecting component 300 and electrically conductive. In this way, during the test, the conductive member 400 can receive power supply from the external power supply 820 to provide the required electrical energy for the connecting component 300, and then the clamping member 500 is subjected to the voltage from the connecting component 300 to simulate the actual service environment of the oil and gas pipeline.

[0055] As a feasible implementation, the first shell 100 has a first cavity 110, and the opening is connected to the first cavity 110; at least part of the second shell 200 extends into the first cavity 110, and the second shell 200 located in the first cavity 110 and the inner wall of the first shell 100 together form a accommodating cavity.

[0056] The part to be clamped 500 includes a test section 510 and a connecting section 520 connected to each other. When the part to be clamped 500 is located in the accommodating cavity, the test section 510 is located in the opening, and the side of the test section 510 facing away from the accommodating cavity is exposed through the opening, and the connecting section 520 is located in the accommodating cavity.

[0057] For example, refer to Figures 1 to 3As shown, the first cavity 110 of the first housing 100 includes a test cavity and a connecting cavity that are interconnected. The test cavity is located at the end close to the opening of the first housing 100, the test section 510 of the clamped part 500 is located in the test cavity, and the connecting section 520 and the part of the second housing 200 extending into the first cavity 110 are both located in the connecting cavity. In the axial extension direction of the first housing 100, the cross-sectional area of ​​the test cavity is smaller than the cross-sectional area of ​​the connecting cavity. In other words, the first housing 100 has a step at the connection point between the test cavity and the connecting cavity. In this way, when the part to be clamped 500 is placed in the accommodating cavity formed by the first shell 100 and the second shell 200, the two ends of the connecting section 520 of the part to be clamped 500 respectively abut against the step and the second shell 200 extending into the connecting cavity, thereby limiting the axial movement of the part to be clamped 500 along the first shell 100; at the same time, the connecting section 520 of the part to be clamped 500 abuts against the inner circumference of the connecting cavity, thereby further limiting the circumferential movement of the part to be clamped 500 along the first shell 100, thereby improving the stability of the part to be clamped 500 in the test fixture.

[0058] For example, by exposing one side of the test section 510 facing away from the accommodating cavity through an opening, during the test, only one side of the test section 510 in the clamped part 500 is used as the test side, and the remaining sides are located in the accommodating cavity, thereby avoiding unnecessary reactions. In the later stage, only the data of the test side needs to be counted, which facilitates the collection and collection of later data and improves the detection accuracy of the test.

[0059] For example, a chamfer may be provided at the connection between the surface of the test section 510 facing away from the accommodating cavity and the first housing 100 to avoid stress concentration.

[0060] As a feasible implementation, the second housing 200 has a protrusion 220 , which extends into the first cavity 110 ; when the to-be-clamped member 500 is located in the accommodating cavity, the protrusion 220 abuts against a side of the to-be-clamped member 500 close to the second housing 200 .

[0061] For example, refer to Figure 4 As shown, the second housing 200 has a protrusion 220, the outer periphery of the protrusion 220 has a protrusion thread, the end of the first cavity 110 away from the outlet is provided with a cavity thread, and the protrusion 220 and the first housing 100 are threadedly connected through the protrusion thread and the cavity thread. In this way, the firmness and sealing of the connection between the first housing 100 and the second housing 200 are improved, and the assembly process of the first housing 100 and the second housing 200 is simplified, and the test efficiency is improved. This detachable connection method also realizes the repeated use of the first housing 100 and the second housing 200.

[0062] For example, after the member to be clamped 500 is placed in the accommodating cavity, the projection 220 abuts against a side of the member to be clamped 500 close to the second housing 200 , thereby limiting the movement of the member to be clamped 500 along the axial direction of the first housing 100 .

[0063] For example, the protrusion 220 of the second housing 200 and the first housing 100 may also be snap-fitted.

[0064] As a feasible implementation, the second housing 200 has a second cavity 210 , and along the direction in which the first housing 100 , the second housing 200 , and the connecting assembly 300 are sequentially connected, the second cavity 210 penetrates the second housing 200 .

[0065] At least part of the connecting component 300 passes through the second housing 200 and extends into the first cavity 110 ; when the part to be clamped 500 is located in the accommodating cavity, the part of the connecting component 300 extending into the first cavity 110 is connected to the part to be clamped 500 and is electrically conductive.

[0066] For example, refer to Figure 1 and Figure 4 As shown, the second cavity 210 of the second housing 200 and the first cavity 110 are connected to each other, along the direction in which the first housing 100, the second housing 200 and the connecting assembly 300 are connected in sequence, that is, Figure 1 In the Y direction shown, the second cavity 210 penetrates the second housing 200, so that at least part of the connecting component 300 can pass through the second cavity 210 and penetrate the second housing 200 and extend into the first cavity 110. During the test, the conductive member 400 transfers the electric energy obtained from the external power source 820 to the connecting component 300, and the part of the connecting component 300 extending into the first cavity 110 transfers the electric energy to the part to be clamped 500, so as to provide the required test environment for the part to be clamped 500.

[0067] As a feasible implementation, the connection assembly 300 includes a connection head 310, a connection rod 320 and a nut 330. The connection head 310 has a connection cavity. The connection rod 320, the nut 330 and at least part of the conductive member 400 are located in the connection cavity.

[0068] A side of the connector 310 close to the second housing 200 has a connection opening that communicates with the connection cavity, and at least a portion of the nut 330 is fixedly installed at the connection opening.

[0069] The connecting rod 320 passes through a connecting opening and is threadedly connected to the nut 330 ; at least a portion of the connecting rod 320 passes through the second cavity 210 and extends into the first cavity 110 .

[0070] When the to-be-clamped member 500 is located in the accommodating cavity, the connecting rod 320 extending into the first cavity 110 is connected to the to-be-clamped member 500 and is electrically conductive.

[0071] For example, refer to Figure 1 and Figure 2 As shown, a groove 530 is provided on one side of the connecting section 520 of the clamped part 500 close to the second housing 200, and a groove thread is provided in the groove 530 for connecting with the connecting rod 320. Similarly, a first connecting thread is provided on the outer periphery of the first end of the connecting rod 320 for connecting with the clamped part 500.

[0072] For example, after the part to be clamped 500 is placed in the accommodating cavity formed by the first shell 100 and the second shell 200, the first end of the connecting rod 320 passes through the connecting opening and the second cavity 210 in sequence, and extends into the first cavity 110. The first end of the connecting rod 320 and the groove 530 of the connecting section 520 are threadedly connected through the first connecting thread and the groove thread. On the one hand, the threaded connecting rod 320 and the connecting section 520 can realize power transmission; on the other hand, this detachable connection method simplifies the connection between the connecting rod 320 and the connecting section 520, and improves the assembly efficiency of the test fixture.

[0073] After the first end of the connecting rod 320 is connected to the connecting section 520 , the nut 330 is threadedly connected to the second end of the connecting rod 320 . Similarly, the second end of the connecting rod 320 is provided with a second connecting thread for threaded connection with the nut 330 .

[0074] For example, refer to Figure 5 As shown, the connection opening at the connector 310 is hexagonal, and at least part of the nut 330 is fixedly installed at the connection opening. In this way, the design of the connection opening allows the connector 310 to be easily connected to the connecting rod 320, and the stability of the connection is maintained by the fixed installation of the nut 330, effectively preventing loosening and falling off.

[0075] For example, the first housing 100 , the second housing 200 and the connector 310 are all made of insulating materials. For example, the first housing 100 and the second housing 200 may be plastic housings, and the connector 310 may be an insulating connector made of plastic.

[0076] As a feasible implementation manner, the connector 310 and the second housing 200 are connected to each other, and the connection points between the connector 310 and the second housing 200 are distributed around the periphery of the second cavity 210 .

[0077] In some embodiments, the first housing 100 and the second housing 200 are connected to each other, and the connection points of the first housing 100 and the second housing 200 are distributed around the periphery of the first cavity 110 .

[0078] For example, the test fixture also includes a first shell flange and a second shell flange, the first shell flange is located at the end of the first shell 100 close to the second shell 200, and the second shell flange is located at the end of the second shell 200 close to the first shell 100. The first shell flange and the second shell flange are arranged, and the first shell flange and the second shell flange arranged on the outer periphery of the first shell 100 and the second shell 200 are connected by bolts to realize the connection between the first shell 100 and the second shell 200, thereby improving the connection stability and connection sealing of the first shell 100 and the second shell 200.

[0079] In this way, the portion where the first housing flange and the second housing flange connect the first housing 100 and the second housing 200 may be the connection point of the first housing 100 and the second housing 200 , and the connection points are distributed around the periphery of the first cavity 110 .

[0080] For example, the test fixture further includes a first connecting flange and a second connecting flange, the first connecting flange is located at an end of the second housing 200 close to the connecting head 310, and the second connecting flange is located at an end of the connecting head 310 close to the second housing 200. The first connecting flange and the second connecting flange are provided, and the first connecting flange and the second connecting flange provided on the outer periphery of the second housing 200 and the connecting head 310 are connected by bolts to realize the connection between the second housing 200 and the connecting head 310.

[0081] In this way, the portion where the first connecting flange and the second connecting flange connect the second housing 200 and the connector 310 can be the connection point between the second housing 200 and the connector 310. By providing the first connecting flange and the second connecting flange, and connecting the first connecting flange and the second connecting flange provided on the outer periphery of the second housing 200 and the connector 310 by bolts, the connection between the second housing 200 and the connector 310 is achieved, thereby improving the connection stability and connection sealing of the second housing 200 and the connector 310.

[0082] In this way, the portion where the first connection flange and the second connection flange connect the second housing 200 and the connector 310 may be a connection point between the second housing 200 and the connector 310. The connection points are distributed around the outer circumference of the second cavity 210.

[0083] For example, the connection method of the first shell 100 and the second shell 200 can also be screwed, and the connection point of the first shell 100 and the second shell 200 is the bolted connection part, and the bolted connection part is distributed around the periphery of the first cavity 110 to improve the connection stability; the connection method of the first shell 100 and the second shell 200 can also be pinned, and the connection point of the first shell 100 and the second shell 200 is the pinned connection part, and the pinned connection part is distributed around the periphery of the first cavity 110 to improve the connection stability; the present application does not limit the connection method of the first shell 100 and the second shell 200.

[0084] Similarly, the connection method between the second housing 200 and the connector 310 can also be screwed or pinned, and the beneficial effects achieved are consistent with the connection method between the first housing 100 and the second housing 200, so it is not repeated here. The present application does not limit the connection method between the second housing 200 and the connector 310.

[0085] As a feasible implementation, the test fixture further includes a sealing member, and there are multiple sealing members, which are respectively arranged at the connection between the first shell 100 and the second shell 200 , and at the connection between the second shell 200 and the connector 310 .

[0086] For example, a first shell groove 120 is provided at an end of the first shell 100 close to the second shell 200, and a second shell groove 230 is provided at an end of the second shell 200 close to the first shell 100. The first shell groove 120 and the second shell groove 230 are connected to each other to form a first connection.

[0087] A first connection groove 240 is disposed at an end of the second housing 200 close to the connection head 310 , and a second connection groove 340 is disposed at an end of the connection head 310 close to the second housing 200 . The first connection groove 240 and the second connection groove 340 are butted against each other to form a second connection point.

[0088] By respectively arranging multiple seals at the first connection and the second connection, the sealing performance at the connection between the first shell 100 and the second shell 200 and the connection between the first shell 100 and the connector 310 can be effectively improved, thereby avoiding reactions on the non-exposed surface of the clamped part 500 during the test and improving the test accuracy.

[0089] For example, the sealing member may be a sealing ring or a sealing strip.

[0090] As a feasible implementation, the test fixture further includes an insulating shell 700 , which is coated on the outside of the conductive component 400 and fixedly connected to the insulating packaging component 600 .

[0091] For example, by covering the insulating shell 700 on the outside of the conductive member 400, the insulating shell 700 can effectively prevent the conductive member 400 from contacting the external environment, avoiding safety problems such as circuit short circuit and leakage, and improving the safety of the test fixture; and the insulating shell 700 can reduce the impact of external interference on the circuit and improve the anti-interference ability of the test fixture. The insulating shell 700 can be a shell made of plastic, rubber or other insulating materials.

[0092] For example, after the first end of the connecting rod 320 is connected to the part to be clamped 500 and the second end of the part to be clamped 500 is threadedly connected to the nut 330, the conductive member 400 and the second end of the connecting rod 320 are welded to achieve electrical conduction between the conductive member 400 and the connecting rod 320 during the test.

[0093] For example, the insulating housing 700 may be a housing made of polyvinyl chloride.

[0094] For example, the conductive member 400 may be a copper wire.

[0095] As a feasible implementation manner, the connection cavity is filled with an insulating packaging member 600 , and the insulating packaging member 600 covers and packages the connection rod 320 and a portion of the conductive member 400 located in the connection cavity.

[0096] For example, after the conductive member 400 and the connecting rod 320 are connected, the insulating package 600 can be filled into the connecting cavity, so that the insulating package 600 covers and encapsulates the connecting rod 320 and the conductive member 400 partially located in the connecting cavity, effectively preventing the connecting rod 320 and the conductive member 400 from contacting the external environment, avoiding safety problems such as circuit short circuit and leakage; in addition, the insulating package 600 can provide additional anti-corrosion protection, preventing the connecting rod 320 and the conductive member 400 from being damaged by corrosive factors such as moisture and chemicals, and extending the service life of the test fixture. In addition, the insulating package 600 can provide mechanical protection for the connecting rod 320 and the conductive member 400, reduce the impact of external shock or vibration on the circuit, and ensure the stability and reliability of the connection.

[0097] For example, the insulating package 600 may be a solidified epoxy resin, or the insulating package 600 may be a solidified unsaturated polyester resin.

[0098] For example, after the test fixture is used, the first housing 100 and the second housing 200 can be disassembled, the clamped part 500 can be removed, and the clamped part 500 can be analyzed. Meanwhile, the rest of the test fixture does not need to be disassembled, and subsequent tests can be continued.

[0099] For example, the first shell 100 can be a hollow cylinder, the height range of the first shell 100 can be 10-20 mm, the bottom diameter range of the first shell 100 can be 22-28 mm, the diameter range of the test cavity can be 9-13 mm, and the length range of the test cavity can be 4-7 mm; the diameter range of the connecting cavity can be 14-18 mm, and the length range of the connecting cavity can be 6-13 mm; the thread specification range of the cavity thread of the first shell 100 can be M15-M17.

[0100] The second shell 200 can be a hollow cylinder. The height range of the second shell 200 including the protrusion 220 can be 19-23 mm, the bottom diameter range of the second shell 200 can be 22-28 mm, the diameter range of the second cavity 210 can be 5-7 mm, and the length range of the second cavity 210 can be 19-23 mm; the thread specification range of the protrusion thread of the protrusion 220 of the second shell 200 can be M15-M17.

[0101] The part to be clamped 500 can be a cap-shaped specimen, the diameter range of the test section 510 is 9-13 mm, the length range of the test section 510 is 4-7 mm, the diameter range of the connecting section 520 is 13-15 mm; the length range of the connecting section 520 is 4-4.5 mm; the thread specification range of the groove thread of the connecting end can be M5-M7.

[0102] The bottom diameter of the connector 310 is in the range of 22-28 mm, the side length of the regular hexagonal connection opening is in the range of 5-7 mm; the cross-sectional area of ​​the conductive member 400 is in the range of 3-5 mm 2 , the length of the conductive member 400 ranges from 2.8 to 3.2 m.

[0103] In some embodiments, the first shell 100 can be a hollow cylinder, the height of the first shell 100 is 15 mm, the bottom diameter of the first shell 100 is 25 mm, the diameter of the test cavity is 11.3 mm, and the length of the test cavity is 5 mm; the diameter of the connecting cavity is 16 mm, and the length of the connecting cavity is 10 mm; the thread specification of the cavity thread of the first shell 100 is M16.

[0104] The second shell 200 can be a hollow cylinder. The height of the protrusion 220 of the second shell 200 is 21 mm. The bottom diameter of the second shell 200 is 25 mm. The diameter of the second cavity 210 is 6 mm. The length of the second cavity 210 is 21 mm. The thread specification of the protrusion thread of the protrusion 220 of the second shell 200 is M16.

[0105] The part to be clamped 500 can be a cap-shaped specimen, the diameter of the test section 510 is 11.3 mm, the length of the test section 510 is 5 mm, the diameter of the connecting section 520 is 14 mm; the length of the connecting section 520 is 4.3 mm; the thread specification of the groove thread at the connecting end is M6.

[0106] The bottom diameter of the connector 310 is 25 mm, the side length of the regular hexagonal connection opening is 6 mm; the cross-sectional area of ​​the conductive member 400 is 4 mm 2 , the length of the conductive member 400 is 3 m.

[0107] Second, refer to Figure 6 As shown, the present application provides a test device, including a box 800, a filling medium 810, an external power supply 820, a wire 830, an auxiliary electrode 840 and the above-mentioned test fixture, the filling medium 810 is located in the cavity of the box 800, the auxiliary electrode 840 and the test fixture are both located in the filling medium 810, and the two levels of the external power supply 820 are respectively connected to the auxiliary electrode 840 and the test fixture through the wire 830.

[0108] For example, after the clamped object 500 is placed in the clamping area of ​​the test fixture, the end of the test fixture provided with the first housing 100 is extended into the filling medium 810 of the box 800, the conductive member 400 of the test fixture is connected to the wire 830, one end of the auxiliary electrode 840 is connected to the wire 830, and the auxiliary electrode 840 is placed in the filling medium 810, and the distance between the auxiliary electrode 840 and the clamped object 500 is controlled, and then the wire 830 connected to the auxiliary electrode 840 and the wire 830 connected to the conductive member 400 are connected. 0 are respectively connected to the positive and negative electrodes of the external power supply 820. At this time, the two electrodes of the external power supply 820 are connected to the circuit, which can maintain a constant potential difference between the two ends of the circuit, thereby forming a current from the positive electrode to the negative electrode in the external circuit. In this way, there is a potential difference between the part to be clamped 500 and the auxiliary electrode 840. The auxiliary electrode 840 transmits current to the part to be clamped 500 through the filling medium 810, and a reaction occurs between the outer surface of the part to be clamped 500 exposed to the opening of the first shell 100 and the filling medium 810 to simulate the actual service environment of the pipeline.

[0109] By way of example, the filling medium 810 may be soil.

[0110] It is understandable that, since the test device of the present application adopts the technical solution of the above-mentioned test fixture embodiment, it at least has the beneficial effects brought by the technical solution of the above-mentioned embodiment, which will not be described one by one here.

[0111] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0112] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A test fixture, characterized in that: It comprises a first housing, a second housing, a connecting component and a conductive member; the first housing, the second housing and the connecting component are connected in sequence; A receiving cavity for placing the clamped component is formed between the first shell and the second shell, and an opening communicating with the receiving cavity is provided on the first shell; the conductive member is connected to and electrically connected with at least part of the connecting assembly, and is used to be electrically connected to an external power source; When the member to be clamped is located in the accommodating cavity, one side outer surface of the member to be clamped is exposed to the opening; the member to be clamped is connected to a portion of the connecting assembly and is electrically conductive.

2. The test fixture according to claim 1, characterized in that: The first shell has a first cavity, and the opening is connected to the first cavity; at least a portion of the second shell extends into the first cavity, and the second shell located in the first cavity and the inner wall of the first shell together form the accommodating cavity; The part to be clamped includes a test section and a connecting section connected to each other. When the part to be clamped is located in the accommodating cavity, the test section is located in the opening, a side of the test section facing away from the accommodating cavity is exposed through the opening, and the connecting section is located in the accommodating cavity.

3. The test fixture according to claim 2, characterized in that: The second shell has a protrusion, and the protrusion extends into the first cavity; when the to-be-clamped member is located in the accommodating cavity, the protrusion abuts against a side of the to-be-clamped member close to the second shell.

4. The test fixture according to claim 2, characterized in that: The second housing has a second cavity, and along the direction in which the first housing, the second housing and the connecting assembly are sequentially connected, the second cavity penetrates the second housing; At least part of the connecting component passes through the second shell and extends into the first cavity; when the part to be clamped is located in the accommodating cavity, the part of the connecting component extending into the first cavity is connected to the part to be clamped and is electrically conductive.

5. The test fixture according to claim 4, characterized in that: The connection assembly comprises a connection head, a connection rod and a nut, wherein the connection head has a connection cavity, and the connection rod, the nut and at least a part of the conductive member are all located in the connection cavity; The connector has a connection opening on one side close to the second housing that is interconnected with the connection cavity, and at least part of the nut is fixedly installed at the connection opening; The connecting rod passes through the connecting opening and is threadedly connected to the nut; At least part of the connecting rod passes through the second cavity and extends into the first cavity; When the to-be-clamped member is located in the accommodating cavity, the connecting rod extending into the first cavity is connected to the to-be-clamped member and is electrically conductive.

6. The test fixture according to claim 5, characterized in that: The connection cavity is filled with an insulating packaging member, which covers and packages the connection rod and a portion of the conductive member located in the connection cavity.

7. The test fixture according to claim 6, characterized in that: It also includes an insulating shell, which covers the outside of the conductive member and is fixedly connected to the insulating packaging member.

8. The test fixture according to claim 6, characterized in that: The connector and the second shell are connected to each other, and the connection points between the connector and the second shell are distributed around the periphery of the second cavity; And / or, the first shell and the second shell are connected to each other, and the connection points between the first shell and the second shell are distributed around the periphery of the first cavity.

9. The test fixture according to any one of claims 6 to 8, characterized in that: It also includes a sealing member, and there are multiple sealing members, which are respectively arranged at the connection between the first shell and the second shell, and at the connection between the second shell and the connecting head.

10. A test device, characterized in that: It comprises a box, a filling medium, an external power supply, a wire, an auxiliary electrode and a test fixture according to any one of claims 1 to 9, wherein the filling medium is located in the cavity of the box, the auxiliary electrode and the test fixture are both located in the filling medium, and two levels of the external power supply are respectively connected to the auxiliary electrode and the test fixture through the wire.

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