Insulation impedance test Rogowski coil fixing tool

Abstract

The utility model provides a Rogowski coil fixing tool for insulation resistance testing, which relates to the technical field of insulation resistance testing, and comprises a fixing tool, in the utility model, the fixing tool is firstly placed on a steel rail surface, the steel rail is adsorbed by utilizing the magnetic force of a strong magnet, a Rogowski coil is placed at a corresponding position of the fixing tool, and a clamping pin is positioned at the upper part of a groove of the tool; the positioning assembly is used for positioning the Rogowski coil, meanwhile, the screw and the positioning pin are matched and locked to prevent the Rogowski coil from shifting, then the positioning assembly is installed at the preset position of the fixing tool, the push block and the first telescopic spring are pushed to drive the moving block and the positioning plate to move, and through cooperation of the rotating block, the first limiting groove and the second limiting groove, the Rogowski coil is positioned. After the push block is loosened, the spring rebounds to enable the positioning plate to tightly press the Rogowski coil, the position of the Rogowski coil is ensured to be fixed, rapid disassembly and assembly, anti-vibration stability and accurate positioning and stable clamping of the Rogowski coil are achieved, and the device is suitable for high-precision measurement of railway insulation resistance.

Description

Technical Field

[0001] This utility model relates to the field of insulation impedance testing technology, and in particular to a Rogowski coil fixing fixture for insulation impedance testing. Background Technology

[0002] Insulation impedance testing is a crucial step in ensuring the safety of electrical equipment. Rogowski coils are widely used in impedance testing. However, existing Rogowski coil testing methods often suffer from a lack of stability and accuracy in their fixtures, leading to significant errors in the test data. Therefore, developing a high-precision and stable fixture can effectively improve testing efficiency and accuracy, meeting the stringent impedance testing requirements of modern electrical equipment.

[0003] However, in practical use, the following shortcomings still exist. For example, the existing Rogowski coil fixing fixture for insulation impedance testing cannot achieve rapid assembly and disassembly and vibration resistance stability. The precise positioning and stable clamping of the Rogowski coil are not suitable for high-precision measurement of railway insulation impedance. The lack of precise positioning and stable clamping functions may lead to repeated adjustments of the Rogowski coil position after installation, increasing debugging time. The railway environment is subject to vibration. If the fixture's vibration resistance stability is insufficient, the Rogowski coil may experience slight movement or displacement, causing deviation of the measurement reference and introducing errors. The Rogowski coil measures current by inducing a magnetic field. Its positional deviation will change its relative position with the circuit under test, causing changes in the intensity and distribution of the induced magnetic field, which will lead to deviations in the measured current value. Insulation impedance measurement is usually calculated based on parameters such as leakage current. Inaccurate current measurement will directly lead to large errors in the calculated insulation impedance, failing to truly reflect the insulation performance of the tested object.

[0004] Therefore, this utility model proposes a Rogowski coil fixing fixture for insulation impedance testing to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a Rogowski coil fixing fixture for insulation impedance testing.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a Rogowski coil fixing fixture for insulation impedance testing, comprising a fixing fixture, and further comprising:

[0007] A fixing component, the fixing component including a locating pin disposed on a fixing fixture, a screw threadedly connected to the fixing fixture, the screw being threadedly connected to the locating pin, and a strong magnet connected to the fixing fixture;

[0008] A positioning assembly includes a housing disposed on one side of a fixed fixture, a push block slidably connected inside the housing, a first telescopic spring connected to the push block, a moving block connected to the other end of the first telescopic spring, a positioning plate connected to the moving block, a rotating block rotatably connected inside the housing, a first limiting groove formed on the moving block, a second limiting groove formed on the push block, one end of the rotating block being disposed in the first limiting groove, and the other end of the rotating block being disposed in the second limiting groove.

[0009] Furthermore, the fixing fixture is provided with a positioning groove.

[0010] The beneficial effects of adopting the above-mentioned further solution are: the positioning groove is compatible with the shape of the Rogowski coil. When in use, the Rogowski coil is placed in it. With the limiting effect of the positioning groove, the position of the Rogowski coil is precisely constrained, ensuring its installation consistency and avoiding changes in the induced magnetic field due to installation deviation, thus providing a basis for subsequent accurate current measurement.

[0011] Furthermore, the fixing fixture is connected with reinforcing ribs.

[0012] The beneficial effects of adopting the above-mentioned further solution are: the reinforcing ribs are connected to the fixed fixture, which increases the support points and stress surfaces of the fixture structure, thereby improving the overall rigidity and strength of the fixture. When the fixed fixture is subjected to external impact or compression, the reinforcing ribs disperse the stress, prevent the fixture from deforming, and ensure the stability of the Rogowski coil fixing environment.

[0013] Furthermore, a second telescopic spring is provided inside the housing, with one end of the second telescopic spring connected to the housing and the other end connected to the push block.

[0014] The beneficial effects of adopting the above-mentioned further solution are as follows: one end of the second telescopic spring is connected to the housing and the other end is connected to the push block. When the push block is pushed, the second telescopic spring is compressed and stores force. After the push block is released, the second telescopic spring restores its deformation and generates elastic force, pushing the push block to reset, so that the positioning plate can fit the Rogowski coil and achieve a dynamic and stable clamping effect.

[0015] Furthermore, a guide rod is connected to the push block, and the guide rod is slidably connected inside the housing.

[0016] The beneficial effects of adopting the above-mentioned further solution are: one end of the guide rod is connected to the push block, which slides inside the housing, providing guidance for the movement of the push block, avoiding deviation or jamming when the push block moves, ensuring that the push block drives the positioning plate to smoothly and accurately fit the Rogowski coil, and ensuring the stable operation of the positioning component.

[0017] Furthermore, the housing is threaded with bolts, which are threaded onto the reinforcing ribs.

[0018] The beneficial effects of adopting the above-mentioned further solution are: the bolts sequentially connect the housing and the reinforcing ribs with threads, and by tightening the bolts, the housing is firmly installed on the fixed fixture, ensuring that the positioning component and the fixed fixture are tightly connected, so that the entire fixed fixture is structurally stable when fixing the Rogowski coil, and avoiding loosening between components that would affect the fixing effect.

[0019] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0020] In this invention, a fixing fixture is first placed on the rail surface. The rail is attracted by the magnetic force of a strong magnet, and the Rogowski coil is placed in the corresponding position of the fixing fixture. The locking pin is located on the upper part of the groove of the fixture to position the Rogowski coil. At the same time, the screw and the locking pin are locked together to prevent the Rogowski coil from shifting. Then, the positioning component is installed in the predetermined position of the fixing fixture. Pushing the push block causes the first telescopic spring to move the moving block and the positioning plate. Through the cooperation of the rotating block, the first limiting groove and the second limiting groove, the push block and the positioning plate move in opposite directions. After the push block is released, the spring rebounds and the positioning plate presses the Rogowski coil to ensure its fixed position. This achieves quick assembly and disassembly and vibration resistance stability, and provides precise positioning and stable clamping of the Rogowski coil. It is suitable for high-precision measurement of railway insulation impedance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a Rogowski coil fixing fixture for insulation impedance testing according to this utility model;

[0022] Figure 2 This is a schematic diagram of the fixing component structure of a Rogowski coil fixing fixture for insulation impedance testing according to this utility model;

[0023] Figure 3 This is a bottom view of the fixing component structure of the Rogowski coil fixing fixture for insulation impedance testing according to this utility model;

[0024] Figure 4 This is a schematic diagram of the positioning component structure of a Rogowski coil fixing fixture for insulation impedance testing according to this utility model.

[0025] Figure 5 This is a schematic diagram of the internal structure of the positioning component of a Rogowski coil fixing fixture for insulation impedance testing according to this utility model.

[0026] Figure label:

[0027] 1. Fixed fixtures;

[0028] 2. Fixing components; 21. Positioning groove; 22. Reinforcing rib; 23. Positioning pin; 24. Screw; 25. Strong magnet;

[0029] 3. Positioning assembly; 31. Housing; 32. Push block; 33. First telescopic spring; 34. Moving block; 35. Positioning plate; 36. Rotating block; 37. First limiting groove; 38. Second limiting groove; 39. Second telescopic spring; 310. Guide rod; 311. Bolt. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figure 1 - Figure 5 As shown, this embodiment provides a technical solution: a Rogowski coil fixing fixture for insulation impedance testing, including a fixing fixture 1, and further comprising:

[0032] Fixing component 2 includes a positioning pin 23 disposed on fixing fixture 1, a screw 24 threadedly connected to fixing fixture 1, the screw 24 threadedly connected to positioning pin 23, and a strong magnet 25 connected to fixing fixture 1.

[0033] Positioning component 3 includes a housing 31 disposed on one side of the fixed fixture 1. A push block 32 is slidably connected inside the housing 31. A first telescopic spring 33 is connected to the push block 32. The other end of the first telescopic spring 33 is connected to a moving block 34. A positioning plate 35 is connected to the moving block 34. A rotating block 36 is rotatably connected inside the housing 31. A first limiting groove 37 is formed on the moving block 34. A second limiting groove 38 is formed on the push block 32. One end of the rotating block 36 is disposed in the first limiting groove 37, and the other end of the rotating block 36 is disposed in the second limiting groove 38. First, the fixed fixture 1 is placed on the rail surface. The rail is attracted by the magnetic force of the strong magnet 25. The Rogowski coil is then placed in the corresponding position of the fixed fixture 1. The positioning pin is located at the upper part of the groove of the tooling to position the Rogowski coil. At the same time, the screw 24 and the positioning pin 23 cooperate to lock and prevent the Rogowski coil from shifting. Then, the positioning component 3 is installed in the predetermined position of the fixed tooling 1. Pushing the push block 32, the first telescopic spring 33 drives the moving block 34 and the positioning plate 35 to move. Through the cooperation of the rotating block 36, the first limiting groove 37 and the second limiting groove 38, the push block 32 and the positioning plate 35 move in opposite directions. After the push block 32 is released, the spring rebounds and the positioning plate 35 presses the Rogowski coil to ensure its fixed position, realizing quick disassembly and assembly and vibration resistance stability. It accurately positions and stably clamps the Rogowski coil and is suitable for high-precision measurement of railway insulation impedance.

[0034] The above solutions also have the problem of failing to ensure the stability of the Rogowski coil's mounting environment when it is being fixed. Figure 1 - Figure 3 As shown: The fixed fixture 1 has a positioning groove 21, which is adapted to the shape of the Rogowski coil. When in use, the Rogowski coil is placed in it. With the limiting effect of the positioning groove 21, the position of the Rogowski coil is precisely constrained, ensuring its installation consistency and avoiding changes in the induced magnetic field due to installation deviation. This provides a basis for subsequent accurate current measurement. The fixed fixture 1 is connected to a reinforcing rib 22. The reinforcing rib 22 is connected to the fixed fixture 1. By increasing the support points and force-bearing surfaces of the fixture structure, the overall rigidity and strength of the fixture are improved. When the fixed fixture 1 is subjected to external impact or compression, the reinforcing rib 22 disperses the stress, prevents the fixture from deforming, and ensures the stability of the Rogowski coil fixing environment.

[0035] like Figure 1 as well as Figure 4 - Figure 5 As shown, a second telescopic spring 39 is provided inside the housing 31. One end of the second telescopic spring 39 is connected to the housing 31, and the other end is connected to the push block 32. When the push block 32 is pushed, the second telescopic spring 39 compresses and stores force. After the push block 32 is released, the second telescopic spring 39 recovers its deformation and generates elastic force, pushing the push block 32 to reset, so that the positioning plate 35 can fit against the Rogowski coil, achieving a dynamically stable clamping effect. A guide rod 310 is connected to the push block 32. The guide rod 310 is slidably connected inside the housing 31, and one end of the guide rod 310 is connected to the push block 32. The pusher 32 slides within the housing 31, providing guidance for its movement and preventing it from shifting or jamming. This ensures that the pusher 32 drives the positioning plate 35 to smoothly and accurately fit the Rogowski coil, guaranteeing the stable operation of the positioning assembly 3. The housing 31 is threaded with bolts 311, which are threaded onto the reinforcing rib 22. The bolts 311 are threaded onto the housing 31 and the reinforcing rib 22 in sequence. By tightening the bolts 311, the housing 31 is securely installed on the fixing fixture 1, ensuring that the positioning assembly 3 and the fixing fixture 1 are tightly connected. This makes the entire fixing fixture 1 structurally stable when fixing the Rogowski coil, preventing loosening between components from affecting the fixing effect.

[0036] Working principle:

[0037] like Figure 1 - Figure 5As shown, firstly, the fixing fixture 1 uses the strong magnet 25 at its bottom to magnetically attract the rail surface, thus positioning the fixture 1 and ensuring its stable fit against the rail, laying the foundation for subsequent operations. Simultaneously, the positioning groove 21 on the fixing fixture 1 perfectly matches the shape of the Rogowski coil. After the Rogowski coil is placed in the positioning groove 21, the groove wall restricts the displacement of the Rogowski coil, ensuring consistent installation position each time and avoiding changes in the induced magnetic field due to positional deviations, thereby ensuring the accuracy of current measurement. Reinforcing ribs 22 are distributed on the fixing fixture 1 to increase... The support points and stress surfaces of the machining fixture structure, when subjected to external impact or compression, the reinforcing ribs 22 can effectively disperse stress, prevent fixture deformation, and provide a stable fixing environment for the Rogowski coil. In the fixing assembly 2, the positioning pin 23 is located at the upper part of the groove of the fixing fixture 1. When the Rogowski coil is placed into the positioning groove 21, the positioning pin 23 restricts the displacement of the coil from above. At the same time, the screw 24 cooperates with the positioning pin 23 to lock, enhancing the fixing effect and preventing its displacement. In the positioning assembly 3, the housing 31 is connected to the fixing fixture 1 by bolts 311. The reinforcing rib 22 is fixed to ensure that the positioning component 3 is tightly connected to the fixing fixture 1. When the push block 32 is pushed, the push block 32 slides smoothly inside the housing 31 under the guidance of the guide rod 310, avoiding deviation and jamming. During this process, the first telescopic spring 33 is compressed, accumulating elastic potential energy, and at the same time driving the moving block 34 to move. One end of the rotating block 36 is in the first limiting groove 37, and the other end is in the second limiting groove 38. As the push block 32 moves, it passes through the rotating block 36, the first limiting groove 37, and the second limiting groove 38. The cooperation of the push block 32 causes the rotating block 36 to rotate, and the rotating block 36 causes the moving block 34 to move, converting the movement of the push block 32 into the reverse movement of the positioning plate 35. When the push block 32 is released, the first telescopic spring 33 and the second telescopic spring 39 restore their deformation, generating elastic force to push the push block 32 back to its original position, so that the positioning plate 35 continuously presses the Rogowski coil, achieving a dynamic and stable clamping effect, ensuring that the Rogowski coil is fixed in position during the measurement process, effectively improving vibration resistance and meeting the requirements of high-precision measurement of railway insulation impedance.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A fixture for fixing a Rogowski coil for insulation impedance testing, comprising a fixture (1), characterized in that, Also includes: The fixing component (2) includes a positioning pin (23) disposed on the fixing fixture (1), a screw (24) is threadedly connected to the fixing fixture (1), the screw (24) is threadedly connected to the positioning pin (23), and a strong magnet (25) is connected to the fixing fixture (1). The positioning component (3) includes a housing (31) disposed on one side of the fixed fixture (1), a push block (32) is slidably connected inside the housing (31), a first telescopic spring (33) is connected to the push block (32), a moving block (34) is connected to the other end of the first telescopic spring (33), a positioning plate (35) is connected to the moving block (34), a rotating block (36) is rotatably connected inside the housing (31), a first limiting groove (37) is provided on the moving block (34), a second limiting groove (38) is provided on the push block (32), one end of the rotating block (36) is disposed in the first limiting groove (37), and the other end of the rotating block (36) is disposed in the second limiting groove (38).

2. The Rogowski coil fixing fixture for insulation impedance testing according to claim 1, characterized in that: The fixed fixture (1) is provided with a positioning groove (21).

3. The Rogowski coil fixing fixture for insulation impedance testing according to claim 1, characterized in that: The fixed fixture (1) is connected to a reinforcing rib (22).

4. The Rogowski coil fixing fixture for insulation impedance testing according to claim 1, characterized in that: A second telescopic spring (39) is provided inside the housing (31). One end of the second telescopic spring (39) is connected to the housing (31), and the other end of the second telescopic spring (39) is connected to the push block (32).

5. The Rogowski coil fixing fixture for insulation impedance testing according to claim 1, characterized in that: The push block (32) is connected to a guide rod (310), which is slidably connected inside the housing (31).

6. The Rogowski coil fixing fixture for insulation impedance testing according to claim 1, characterized in that: The housing (31) is threaded with a bolt (311), which is threaded onto the reinforcing rib (22).

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