High-strength tension insulator test fixture

Abstract

The application relates to a high-strength tension insulator test tool which comprises a base plate and a base fixedly arranged on the base plate, a conical hole is arranged in the middle of the base plate, and a plurality of clamping blocks are slidably connected in the conical hole; the clamping block comprises a sliding part and a clamping end which are fixedly connected with each other, the sliding part is slidably connected with the inner wall of the conical hole, the sliding part is parallel to the generatrix of the conical hole and points to the central axis of the conical hole, and the clamping end is parallel to the central axis of the conical hole; an electromagnet is arranged in the base, a position sensor is arranged on the clamping end, a signal output end of the position sensor is connected with a controller, and the electromagnet is electrically connected with the controller; the high-strength tension insulator test tool can extrude the clamping block to the direction of the test steel rope through the electromagnet, the friction between the clamping block and the steel rope is increased, the clamping block is more tightly clamped with the conical hole under the pulling of the steel rope, the lateral tension during the test can be borne, and the reliability is high.

Description

Technical Field

[0001] This invention relates to the electrical field, and more particularly to a high-strength tension insulator testing fixture. Background Technology

[0002] Insulators are devices installed between conductors at different potentials or between a conductor and a grounding component, capable of withstanding voltage and mechanical stress. They include porcelain insulators, glass insulators, and composite insulators, and are widely used in low- and high-voltage overhead transmission lines. They feature electrical insulation, high mechanical strength, and high stability. During use, insulators must withstand the high tensile forces of the transmission line. To ensure reliability, manufacturers need to conduct a series of reliability tests, including tensile tests, on the insulators they produce. During tensile testing, one end of the insulator is typically fixed to a testing fixture using a steel rope, while the other end is connected to the tensile testing equipment. A high-strength tension test is then performed, with test forces exceeding 200 kN. The testing fixture must withstand enormous lateral tensile forces during testing. Frequent testing often results in deformation or breakage of the testing fixture, or the steel rope detaching from the fixture, affecting the accuracy of the test results and posing significant safety hazards. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a high-strength tension insulator testing fixture. An electromagnet presses the clamping block towards the test steel rope, reducing the pressure exerted on the base and increasing the friction between the clamping block and the steel rope. Under the pull of the steel rope, the clamping block and the tapered hole become increasingly tighter, enabling it to withstand lateral tension during testing and ensuring high reliability. Simultaneously, the electromagnet's action on the magnetic block counteracts the localized pressure exerted on the base by the clamping block, effectively preventing base deformation.

[0004] The technical solution of the present invention is as follows:

[0005] A high-strength tension insulator testing fixture includes a base plate and a base fixedly mounted on the base plate. A conical hole is laterally arranged in the middle of the base, and multiple clamping blocks are slidably connected within the conical hole. Each clamping block includes a sliding part and a clamping end fixedly connected to each other. The sliding part is slidably connected to the inner wall of the conical hole, parallel to the generatrix of the conical hole and pointing towards the central axis of the conical hole. The clamping end is parallel to the central axis of the conical hole. An electromagnet is installed inside the base, and a position sensor is installed on the clamping end. The signal output terminal of the position sensor is connected to a controller, and the electromagnet is electrically connected to the controller.

[0006] The conical hole has one end pointing towards the insulator to be tested, and the clamping blocks are distributed in an equilateral triangle shape inside the conical hole; at the end closest to the insulator to be tested, the clamping end expands outward with a rounded transition.

[0007] The sliding part includes an external non-magnetic sliding layer and a magnetic layer wrapped by the sliding layer. The sliding layer has multiple openings that penetrate into the magnetic layer on the side near the electromagnet.

[0008] The sliding part has a square cross-section. The base has a groove on the side near the conical hole. The cross-sectional size of the groove is slightly larger than that of the sliding part. The groove is parallel to the generatrix of the conical hole. The base has a first slot that connects the groove and the conical hole. A connecting block is fixedly provided on the non-clamping side of the clamping end. The connecting block passes through the first slot and is fixedly connected to the sliding part.

[0009] The base has a hollowed-out cavity in the direction away from the conical hole of the slide groove, and the electromagnet is disposed in the side of the cavity away from the slide groove; the base has a second slot connecting the slide groove and the cavity, and the opening is disposed in the vertical extension direction of the second slot.

[0010] The base is provided with strip-shaped magnetic blocks on both sides of the second slot, and the length direction of the magnetic blocks is parallel to the length direction of the second slot.

[0011] The angle between the generatrix of the tapered hole and the central axis is 5 to 10°.

[0012] The clamping end has protruding serrations on its contact surface with the tensioning steel rope.

[0013] The clamping end has a removable pad on its contact surface with the tensioning steel rope.

[0014] The base plate is provided with a fixing block for fixing the base, and the side of the fixing block near the insulator to be tested is provided with a reinforcing rib.

[0015] The present invention has the following beneficial effects:

[0016] 1. This invention uses an electromagnet to press the clamping block towards the test steel rope, which increases the friction between the clamping block and the steel rope. Under the pull of the steel rope, the steel rope and the clamping block move together towards the insulator to be tested. As the diameter of the conical hole gradually decreases towards the insulator, the clamping block and the conical hole become increasingly tighter, enabling the base to withstand the lateral tension during testing, resulting in high reliability.

[0017] 2. When the clamping block of the present invention is used to fix the steel rope, the radial extrusion of the conical hole causes the steel rope to exert reverse pressure on the clamping block, causing the clamping block to be squeezed against the base. The magnetic repulsion of the electromagnet on the clamping block can reduce the pressure between the clamping block and the base, thereby reducing the force on the sliding part and preventing the sliding part from getting stuck in the groove. At the same time, the extrusion pressure on the base is reduced, which can effectively prevent the base from deforming.

[0018] 3. This invention utilizes the repulsive force of an electromagnet on a magnetic block to counteract some of the squeezing force exerted by the clamping block on a localized area of ​​the base, thereby preventing base deformation and improving testing accuracy and safety.

[0019] 4. The clamping end of the present invention expands outward with an arc transition. At the same time, before the steel rope is inserted, the magnetism generated by the electromagnet is opposite to the magnetism of the magnetic layer. The electromagnet can pull the clamping block towards the larger hole side of the conical hole, so that the clamping end is away from the axis of the conical hole. As such, it can provide a space larger than the cross-section of the steel rope so that the steel rope can be inserted smoothly, and the work efficiency is significantly improved.

[0020] 5. The sliding part of the present invention includes a sliding layer and a magnetic layer. The outer sliding layer is preferably made of ceramic material, which can withstand high pressure and has high wear resistance, thereby increasing the service life of the clamping block. The openings on the sliding layer and the second slot on the base provide channels for the magnetic field of the electromagnet, which facilitates the electromagnet to control the magnetic layer, thereby controlling the movement of the clamping block.

[0021] 6. The angle between the generatrix of the tapered hole and the central axis of the present invention is 5 to 10°. This angle not only ensures the radial support of the clamping block, but also has a good self-locking effect. In addition, this angle makes it easy for the electromagnet to control the movement of the clamping block, and will not cause abnormalities such as jamming or locking.

[0022] 7. The serrations on the clamping end of the present invention can increase the friction between the clamping block and the steel rope. Under the same radial clamping force, it can generate a greater friction force, which can prevent the steel rope from coming out of the clamping block during the test and improve the reliability of the test.

[0023] 8. The present invention has a reinforcing rib on the side of the base that is being pulled, which can disperse the torsional force generated when the base is being pulled, thus significantly improving the strength of the entire tooling and ensuring high safety.

[0024] 9. In Embodiment 2 of the present invention, a removable pad is provided on the end face of the clamping end. Since the clamping end is a vulnerable part, its surface will be worn or deformed after long-term testing, which will affect the test results and test safety. When the pad is worn, it can be replaced in time without replacing the entire clamping block, thus greatly reducing maintenance costs.

[0025] 10. In Embodiment 3 of the present invention, a counting display screen is provided on the side of the test fixture. The counting display screen is electrically connected to the controller. The number of tests can be confirmed in real time through the counting display screen, which can facilitate the operator to confirm the maintenance time of the test fixture and ensure reliability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention;

[0027] Figure 2This is a cross-sectional view of Embodiment 1 of the present invention;

[0028] Figure 3 For the present invention Figure 2 Enlarged view of the circled area;

[0029] Figure 4 This is a side view of one embodiment of the present invention;

[0030] Figure 5 For the present invention Figure 4 A cross-sectional view of position AA;

[0031] Figure 6 For the present invention Figure 5 Enlarged view of the circled area;

[0032] Figure 7 This is a schematic diagram of Embodiment 2 of the present invention;

[0033] Figure 8 For the present invention Figure 7 Enlarged view of the circled area;

[0034] Figure 9 This is a schematic diagram of Embodiment 3 of the present invention.

[0035] The reference numerals in the figure are as follows:

[0036] 1-Base plate, 2-Base, 3-Conical hole, 4-Clamping block, 5-Sliding part, 6-Clamping end, 7-Electromagnet, 8-Position sensor, 9-Controller, 10-Sliding layer, 11-Magnetic layer, 12-Opening, 13-Slide groove, 14-First slot, 15-Connecting block, 16-Cavity, 17-Second slot, 18-Magnetic block, 19-Sawtooth, 20-Panet, 21-Fixing block, 22-Reinforcing rib, 23-Counting display screen, 24-Switch. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0038] Example 1:

[0039] See Figures 1 to 6A high-strength tension insulator testing fixture includes a base plate 1 and a base 2 fixedly mounted on the base plate 1. A conical hole 3 is laterally arranged in the middle of the base 2. Multiple clamping blocks 4 are slidably connected within the conical hole 3. Each clamping block 4 includes a sliding part 5 and a clamping end 6 fixedly connected to each other. The sliding part 5 is slidably connected to the inner wall of the conical hole 3, parallel to the generatrix of the conical hole 3 and pointing towards the central axis of the conical hole 3. The clamping end 6 is parallel to the central axis of the conical hole 3. An electromagnet 7 is installed inside the base 2, and a position sensor 8 is installed on the clamping end 6. The signal output terminal of the position sensor 8 is connected to a controller 9. The electromagnet 7 is electrically connected to the controller 9. The electromagnet 7 can squeeze the clamping block 4 towards the test steel rope, which can increase the friction between the clamping block 4 and the steel rope. Under the pull of the steel rope, the steel rope and the clamping block 4 move together towards the insulator to be tested. As the diameter of the conical hole 3 gradually decreases towards the insulator, the clamping block 4 and the conical hole 3 become more and more tightly locked, thereby increasing the clamping force on the steel rope and preventing the steel rope from coming out of the test fixture during the test. A switch 24 is provided on one side of the base 2. The switch 24 is electrically connected to the controller 9. The switch 24 can directly control the polarity of the electromagnet 7. When it is necessary to pull out the test steel rope, the polarity of the electromagnet 7 can be reversed by the switch 24.

[0040] Furthermore, one end of the small opening of the conical hole 3 points towards the insulator to be tested, and the clamping blocks 4 are distributed in an equilateral triangle within the conical hole 3; at the end near the insulator to be tested, the clamping end 6 expands outward with an arc transition; simultaneously, before the steel rope is inserted, the magnetism generated by the electromagnet 7 is opposite to the magnetism of the magnetic layer 11, and the electromagnet 7 can pull the clamping block 4 towards the larger hole side of the conical hole 3, so that the clamping end 6 is away from the axis of the conical hole 3, which facilitates the smooth insertion of the steel rope; the clamping end 6 is provided with protruding serrations 19 on its contact surface with the tensioned steel rope, which can increase the friction between the clamping block 4 and the steel rope, and generate greater friction under the same radial clamping force, which can prevent the steel rope from coming out of the clamping block 4 during testing.

[0041] Further, see Figures 5 to 6 The sliding part 5 includes an outer non-magnetic sliding layer 10 and a magnetic layer 11 wrapped by the sliding layer 10. The outer sliding layer 10 is preferably made of ceramic material, which can withstand high pressure and has high wear resistance, thereby increasing the service life of the clamping block 4. The sliding layer 10 has a plurality of openings 12 that penetrate to the magnetic layer 11 on the side near the electromagnet 7. The magnetic field of the electromagnet 7 can pass through the openings 12 and control the magnetic layer 11. The cross-sectional shape of the openings 12 can be circular, square, etc., and is not limited here. During the test, the magnetism of the electromagnet 7 is the same as that of the magnetic layer 11. The magnetic repulsion of the electromagnet 7 on the magnetic layer 11 can reduce the pressure between the clamping block 4 and the base 2, thereby reducing the force on the sliding part 5 and reducing the compressive force on the base 2.

[0042] Furthermore, the sliding part 5 has a square cross-section, and the base 2 has a groove 13 on the side near the conical hole 3. The cross-sectional size of the groove 13 is slightly larger than that of the sliding part 5, and the groove 13 is parallel to the generatrix of the conical hole 3. The base 2 has a first slot 14 that connects the groove 13 and the conical hole 3. A connecting block 15 is fixedly provided on the non-clamping side of the clamping end 6. The connecting block 15 passes through the first slot 14 and is fixedly connected to the sliding part 5.

[0043] Furthermore, the base 2 has a hollowed-out chamber 16 in the direction away from the conical hole 3 of the slide groove 13, and the electromagnet 7 is disposed in the side of the chamber 16 away from the slide groove 13; the base 2 has a communicating second slot 17 between the slide groove 13 and the chamber 16, and the opening 12 is disposed in the vertical extension direction of the second slot 17; the second slot 17 provides a channel for the magnetic field of the electromagnet 7, so that the electromagnet 7 can control the magnetic layer 11, and thus control the movement of the clamping block 4.

[0044] Furthermore, the base 2 is provided with strip-shaped magnetic blocks 18 on both sides of the second slot 17. The length direction of the magnetic blocks 18 is parallel to the length direction of the second slot 17. The magnetism of the magnetic blocks 18 is the same as that of the magnetic layer 11, and the magnetic repulsion between the magnetic blocks 18 and the magnetic layer 11 is much smaller than the magnetic force of the electromagnet 7. When testing, the electromagnet 7 generates a magnetic repulsion force on the magnetic blocks 18, which can offset part of the squeezing force of the clamping block 4 on the local position of the base 2 and prevent the base 2 from deforming.

[0045] Furthermore, the angle between the generatrix of the tapered hole 3 and the central axis is 5 to 10°. This angle not only ensures the radial support of the clamping block 4, but also has a good self-locking effect. In addition, this angle makes it easy for the electromagnet 7 to control the movement of the clamping block 4, and will not cause abnormalities such as jamming or locking.

[0046] Furthermore, a fixing block 21 for fixing the base 2 is provided on the base plate 1, and a reinforcing rib 22 is provided on the side of the fixing block 21 near the insulator to be tested; the reinforcing rib 22 can disperse the torsional force generated when the base 2 is pulled, so that the strength of the entire fixture is significantly improved.

[0047] Working principle of the invention:

[0048] Before testing, position sensor 8 did not detect the test steel rope in the conical hole 3. Controller 9 controlled the electromagnet 7 to have a magnetic field opposite to that of magnetic layer 11. Under the action of magnetic attraction, clamping block 4 was pulled to the larger end of the conical hole 3, at which point the opening of clamping block 4 was at its maximum. Then, one end of the steel rope was fixed to one side of the insulator to be tested, and the other end of the steel rope was inserted into the conical hole 3. At this time, clamping block 4 was wrapped around the steel rope. Position sensor 8 on clamping block 4 detected the steel rope and transmitted the information to controller 9. Controller 9 controlled the electromagnet 7 to flip its magnetic field. At this time, magnetic layer 11 was subjected to magnetic repulsion, which then drove clamping block 4 to move towards the smaller hole of the conical hole 3 until clamping end 6 pressed the steel rope. Finally, the other side of the insulator to be tested was connected to the testing equipment.

[0049] During testing, the testing equipment pulls up the insulator, with the other side of the insulator fixed by a steel rope. The synchronous steel rope transmits the tension to the clamping block 4, causing the clamping block 4 to be subjected to lateral tension and squeezed towards the small hole of the conical hole 3. The greater the squeezing force, the greater the radial force of the conical hole 3 on the clamping block 4, and the tighter the steel rope is clamped, preventing the steel rope from coming out during testing. During the test, the polarity of the electromagnet 7 is the same as that of the magnetic layer 11, which can further increase the clamping force of the clamping block 4 on the steel rope. In addition, the magnetic force of the electromagnet 7 can reduce the squeezing of the clamping block 4 on the slide groove 13. At the same time, the magnetism of the magnetic block 18 is the same as that of the magnetic layer 11. The magnetic block 18 is synchronously subjected to the repulsive force of the electromagnet 7, which can offset part of the squeezing force of the clamping block 4 on the base 2.

[0050] After the test is completed, the polarity of electromagnet 7 is switched by switch 24 so that the polarity of electromagnet 7 is opposite to that of magnetic layer 11, and the magnetic attraction force of electromagnet 7 on magnetic layer 11 is greater than the magnetic repulsion force between magnetic layer 11 and magnetic block 18. This causes clamping block 4 to move towards the larger hole of conical hole 3, releasing the lock on the steel rope and allowing the steel rope to be quickly removed from the tooling.

[0051] Example 2:

[0052] The difference between Example 2 and Example 1 is that:

[0053] See Figures 7 to 8 The clamping end 6 is provided with a removable pad 20 on its contact surface with the tension steel rope. As the clamping end 6 is a vulnerable part, its surface will be worn or deformed after long-term testing, which will affect the test results and test safety. When the pad 20 is worn, it can be replaced in time without replacing the entire clamping block 4, which greatly reduces maintenance costs.

[0054] Example 3:

[0055] The difference between Example 3 and Examples 1 and 2 is that:

[0056] See Figure 9The base 2 has a counting display screen 23 on its side, which is electrically connected to the controller 9. When a test is completed, the position sensor 8 records one insertion and one withdrawal of the steel rope. The position sensor 8 transmits the signal to the controller 9. The controller 9 receives the signal, processes the data, and then transmits a digital signal to the counting display screen 23 to increment the count by one. The counting display screen 23 can confirm the number of tests in real time, which can help operators confirm the maintenance time of the test fixture and ensure reliability. Optionally, an alarm indicator light can be set on the counting display screen 23. When the number of tests reaches the set value, the indicator light will light up to remind the operator, which has a better error prevention function.

[0057] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A high-strength tension insulator testing fixture, characterized in that: The device includes a base plate (1) and a base (2) fixedly mounted on the base plate (1). A conical hole (3) is laterally provided in the middle of the base (2). Multiple clamping blocks (4) are slidably connected in the conical hole (3). Each clamping block (4) includes a sliding part (5) and a clamping end (6) fixedly connected to each other. The sliding part (5) is slidably connected to the inner wall of the conical hole (3). The sliding part (5) is parallel to the generatrix of the conical hole (3) and points to the central axis of the conical hole (3). The clamping end (6) is parallel to the central axis of the conical hole (3). An electromagnet (7) is provided in the base (2). A position sensor (8) is provided on the clamping end (6). The signal output terminal of the position sensor (8) is connected to a controller (9). The electromagnet (7) is electrically connected to the controller (9). The small opening of the conical hole (3) points to the insulator to be tested, and the clamping blocks (4) are distributed in an equilateral triangle in the conical hole (3); at the end near the insulator to be tested, the clamping end (6) is widened outward with an arc transition; the sliding part (5) includes an external non-magnetic sliding layer (10) and a magnetic layer (11) wrapped by the sliding layer (10); the sliding layer (10) has a plurality of openings (12) that penetrate to the magnetic layer (11) on the side near the electromagnet (7); the base (2) has a groove (13) on the side near the conical hole (3); the base (2) has a hollowed-out cavity (16) in the direction away from the conical hole (3) of the groove (13), and the electromagnet (7) is located in the cavity (16) on the side away from the groove (13).

2. The high-strength tension insulator testing fixture as described in claim 1, characterized in that: The sliding part (5) has a square cross-section, and the cross-sectional dimension of the groove (13) is slightly larger than that of the sliding part (5). The groove (13) is parallel to the generatrix of the conical hole (3). The base (2) has a first slot (14) that communicates between the groove (13) and the conical hole (3). A connecting block (15) is fixedly provided on the non-clamping side of the clamping end (6). The connecting block (15) passes through the first slot (14) and is fixedly connected to the sliding part (5).

3. The high-strength tension insulator testing fixture as described in claim 2, characterized in that: The base (2) has a second slot (17) that communicates between the slide (13) and the chamber (16), and the opening (12) is located in the vertical extension direction of the second slot (17).

4. The high-strength tension insulator testing fixture as described in claim 3, characterized in that: The base (2) has strip magnetic blocks (18) on both sides of the second slot (17), and the length direction of the magnetic blocks (18) is parallel to the length direction of the second slot (17).

5. The high-strength tension insulator testing fixture as described in claim 1, characterized in that: The angle between the generatrix of the tapered hole (3) and the central axis is 5~10°.

6. The high-strength tension insulator testing fixture as described in claim 1, characterized in that: The clamping end (6) has protruding serrations (19) on its contact surface with the tensioning steel rope.

7. The high-strength tension insulator testing fixture as described in claim 1, characterized in that: The clamping end (6) is provided with a removable pad (20) on its contact surface with the tensioning steel rope.

8. The high-strength tension insulator testing fixture as described in claim 1, characterized in that: The base plate (1) is provided with a fixing block (21) of a fixing base (2), and a reinforcing rib (22) is provided on the side of the fixing block (21) near the insulator to be tested.

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