Testing device for cable stress cone

Abstract

The invention provides a testing device for a cable stress cone, and relates to the technical field of testing devices. The base is placed on a test bed, a base block of a rectangular blocky structure is fixed to the left side of the top end face of the base, two first hydraulic cylinders are fixed to the right end face of the base block, the extending ends of the two first hydraulic cylinders are fixed to a first seat body, a first sliding seat is arranged on the first seat body in a sliding mode, and a pull rod is installed on the first sliding seat. A second hydraulic cylinder is fixed to the right end face of the first seat body, and the extending end of the second hydraulic cylinder is fixed to the first sliding seat. A transmission structure of the worm and the worm gear endows the device with a torsion stretching function, the first motor drives the worm to rotate, and the rotating shaft drives the mounting seat and the binding post to rotate through meshing transmission, so that a torsion moment is applied to the stress cone sleeved between the binding post and the pull rod, a composite test of stretching and torsion is realized, the test dimension is effectively expanded, and the test efficiency is improved. And the actual working condition of the stress cone in a cable bending or complex stress scene can be simulated.

Description

Technical Field

[0001] The invention relates to the technical field of test devices, in particular to a test device for a cable stress cone. Background Art

[0002] The cable stress cone test device is mainly used to test the electrical performance, mechanical performance, thermal performance and comprehensive reliability of the stress cone to ensure that it can effectively improve the electric field distribution and enhance the insulation reliability in cable accessories.

[0003] As disclosed in application number CN200810043883.9, the present invention is a device for testing the quality of a high-voltage cross-linked cable rubber stress cone, comprising a test piece, a voltage-applying end, and a measuring end. The device is characterized in that the test piece is a rubber stress cone, the measuring end is a sealed cylinder, the rubber stress cone is threaded onto a test cable and centered within the sealed cylinder, an epoxy sleeve is provided around the test cable and the rubber stress cone, and a cavity vacuum port is provided. The cavity between the epoxy sleeve and the rubber stress cone is evacuated and filled with pressurized SF₂ or N₂ gas. The epoxy sleeve and the outer shell form a sealed cylinder, and a shell vacuum port is provided. The outer shell is evacuated and filled with pressurized SF₂ or N₂ gas. One end of the test cable extending from the sealed cylinder is connected to a base cable, which serves as the voltage-applying end of the test piece. The device of the present invention significantly shortens testing time and ensures test accuracy and reliability.

[0004] The stress cone test device similar to the above application also has the following shortcomings: Although the breakdown test can be carried out, it is not possible to simultaneously carry out stretching, continuous stretching, and tests under torsion and heating conditions while carrying out the breakdown test, and the test range is narrow; during the stretching process, emergency tests cannot be carried out when the hydraulic cylinder is damaged. Summary of the Invention

[0005] The present invention relates to a test device for a cable stress cone, which solves the problems that although a breakdown test can be performed, stretching, continuous stretching, and tests under torsion and heating states cannot be performed simultaneously during the breakdown test, resulting in a narrow test range; and during the stretching process, an emergency test cannot be performed when a hydraulic cylinder is damaged.

[0006] The present invention provides a test device for a cable stress cone, which specifically includes: a base; the base is placed on a test bench, a rectangular block-shaped base block is fixed at the left position of the top surface of the base, two first hydraulic cylinders are fixed on the right end surface of the base block, the protruding ends of the two first hydraulic cylinders are fixed on the first base body, a first sliding base slides on the first base body, a pull rod is installed on the first sliding base, a second hydraulic cylinder is fixed on the right end surface of the first base body, and the protruding end of the second hydraulic cylinder is fixed on the first sliding base; a second sliding base is fixed on the top surface of the base, a second base body slides on the second sliding base, two coil springs are sleeved on the second sliding base, the right end of the two coil springs contacts the second sliding base, and the left end of the two coil springs contacts the second base body; a rotating shaft rotates on the second base body, a mounting seat is fixed on the left end of the rotating shaft, a terminal post is fixed on the left end surface of the mounting seat, the terminal post is aligned with the pull rod, and the terminal post is electrically connected to an external power supply.

[0007] Furthermore, a worm wheel is welded on the rotating shaft, a worm is rotated on the second base body, and the worm is engaged with the worm wheel; a first motor is fixed on the second base body, and a first motor is fixed on the output shaft of the first motor.

[0008] Furthermore, a force-bearing arm is welded to the right end face of the second base body, and the force-bearing arm is an L-shaped structure. A rectangular block-shaped mounting base is fixed to the top surface of the base, and a second motor is fixed to the front end face of the mounting base. A driving block is fixed to the output shaft of the second motor. When the second motor rotates, the driving block and the force-bearing arm are in a continuous elastic contact state, and under the continuous squeezing of the driving block, the force-bearing arm and the second base body are in a left and right reciprocating movement state.

[0009] Furthermore, the upper end of the driving block is polished, and after the polishing, the upper end of the driving block is an arc-shaped structure.

[0010] Furthermore, the base block, the first hydraulic cylinder, the first seat body, the first sliding seat, the second hydraulic cylinder, the pull rod, the second sliding seat, the second seat body, the coil spring, the rotating shaft, the mounting seat, the terminal, the worm gear, the worm, the first motor, the force arm, the second motor and the driving block together constitute a testing mechanism; a heating mechanism is installed on the second seat body.

[0011] Furthermore, the heating mechanism is composed of a third base body and a heating wire. Two third base bodies are fixed on the left end face of the second base body. Each third base body is installed with a heating wire in a linear array. The heating wires are electrically connected to an external power supply. The heating wires installed in a linear array are located above and below the pull rod and the terminal.

[0012] Furthermore, a scale is embedded on the top surface of the base, and the scale is in contact with the first base body and the second base body.

[0013] Furthermore, a protective mechanism is installed on the base, which consists of a third hydraulic cylinder, a connecting arm and a protective cover. Two third hydraulic cylinders are fixed to the top surface of the base, and a connecting arm is fixed to the protruding end of each third hydraulic cylinder. Both connecting arms are L-shaped structures, and both connecting arms are fixed on the protective cover. The protective cover is a rectangular cover-like structure, and the protective cover covers the outside of the test mechanism and the heating mechanism.

[0014] The present invention provides a test device for cable stress cones, which has the following beneficial effects: The present application constructs diversified testing capabilities through the collaborative design of multiple groups of actuators: the first hydraulic cylinder and the second hydraulic cylinder in the test mechanism form a dual-drive stretching system. Under normal conditions, the second hydraulic cylinder can drive the first sliding seat and the pull rod to achieve precise stretching. When the second hydraulic cylinder is damaged, it can be switched to the first hydraulic cylinder to drive the first seat body to move as a whole to complete emergency stretching. This redundant design ensures the continuity and reliability of the tensile test; at the same time, the transmission structure of the worm and the worm wheel gives the device a torsional stretching function. The first motor drives the worm to rotate, and the rotating shaft drives the mounting seat and the terminal to rotate through the meshing transmission, thereby applying a torsional torque to the stress cone sleeved between the terminal and the pull rod, realizing a composite test of tension and torsion, effectively expanding the test dimension, and can simulate the actual working conditions of the stress cone under cable bending or complex stress scenarios.

[0015] The present application realizes the dynamic reciprocating tensile test of the stress cone through the cooperation of the second motor and the driving block: the arc-shaped polished design above the driving block enables it to form continuous elastic contact with the L-shaped force arm during rotation, and pushes the second seat body to move back and forth left and right on the second sliding seat through periodic extrusion. The elastic action of the coil spring ensures the smoothness of the reciprocating motion; this continuous dynamic loading mode can simulate the periodic stress generated by thermal expansion and contraction or vibration during the long-term operation of the cable. Compared with the static tensile test, it can more truly reflect the fatigue tolerance performance of the stress cone, and further enhance the engineering reference value of the test results.

[0016] This application sets up a heating mechanism: the heating wires distributed in a linear array cover the upper and lower areas of the pull rod and the terminal, which can uniformly heat the stress cone. The temperature is adjusted by an external power supply. It can not only carry out thermal aging tests on the stress cone and observe the degradation trend of the material in a high temperature environment, but also simultaneously carry out breakdown tests and tensile tests under the heating state, simulating the dual impact of temperature rise on insulation performance and mechanical strength during cable operation, realizing the coupled test of temperature field and electrical and mechanical loads, and meeting the test requirements of the synergistic effect of multiple physical fields in actual operation.

[0017] This application adopts the setting of a scale and a protective mechanism: the scale embedded in the base can directly observe the moving distance between the first base and the second base, providing an accurate displacement reference for the tensile test, which is convenient for quantifying the deformation variable and mechanical performance parameters of the stress cone; the protective mechanism drives the lifting and lowering of the protective cover through the third hydraulic cylinder, providing physical protection during the test, preventing the splashing of fragments generated during discharge breakdown or tensile fracture, and ensuring the safety of the operator; when replacing the sample, only the protective cover needs to be raised, and the operation process is simple and efficient, taking into account both safety and ease of use.

[0018] The coordinated operation of the various functional modules in this application enables integrated testing of the electrical, mechanical, and thermal properties of the stress cone. The electrical connection of the terminal to the external power supply allows for direct breakdown testing to observe the insulation withstand capability of the stress cone under power. The application of mechanical loads such as tension, torsion, and reciprocating motion, combined with the temperature control of the heating mechanism, establishes a full-scenario testing system from static to dynamic, and from room temperature to high temperature. This multifunctional integrated design avoids the cumbersome process of switching between multiple sets of equipment required for traditional testing, reducing equipment investment costs and space occupation. At the same time, multi-dimensional testing is completed on the same benchmark platform, ensuring the correlation and comparability of test data, improving test efficiency and result accuracy. In addition, the device's detailed design reflects reliability and durability. The arc-shaped grinding treatment of the drive block reduces rigid impact with the load arm, reduces mechanical wear, extends the service life of key components, and reduces maintenance frequency and cost. The elastic buffering effect of the coil spring absorbs the impact load during reciprocating motion, preventing stress mutations from damaging the specimen and the mechanism itself. The precise guide structure used in the matching of each slide seat and hydraulic cylinder ensures straightness and stability during movement, further improving the accuracy of test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0020] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0021] In the attached figure: Figure 1 The figure shows the axial structural schematic diagram of the test device of the cable stress cone of the present invention; Figure 2 A schematic diagram of the axial structure of a partially cutaway test device for a cable stress cone according to the present invention is shown; Figure 3 A schematic diagram of the main structure of a partially cutaway cable stress cone test device according to the present invention is shown; Figure 4 The figure shows the axial structural diagram of the base and the test mechanism of the present invention; Figure 5The present invention is shown Figure 4 A schematic diagram of the enlarged structure at point A; Figure 6 The present invention is shown Figure 4 Schematic diagram of the axial structure after rotation; Figure 7 The figure shows a partially cutaway axial structural diagram of the protection mechanism of the present invention; Figure 8 The figure shows an axial structural schematic diagram of the heating mechanism of the present invention.

[0022] Reference Signs List 1. Base; 101. Scale; 2. Test mechanism; 201. Base block; 202. First hydraulic cylinder; 203. First seat body; 204. First sliding seat; 205. Second hydraulic cylinder; 206. Pull rod; 207. Second sliding seat; 208. Second seat body; 209. Coil spring; 210. Rotating shaft; 211. Mounting seat; 212. Terminal; 213. Worm gear; 214. Worm; 215. First motor; 216. Force arm; 217. Second motor; 218. Drive block; 3. Heating mechanism; 301. Third seat body; 302. Heating wire; 4. Protective mechanism; 401. Third hydraulic cylinder; 402. Connecting arm; 403. Protective cover. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1: Please refer to Figures 1 to 8 : The present invention proposes a test device for a cable stress cone, comprising: a base 1; the base 1 is placed on a test bench, a rectangular block 201 is fixed at the left position of the top surface of the base 1, two first hydraulic cylinders 202 are fixed to the right end surface of the base block 201, the protruding ends of the two first hydraulic cylinders 202 are fixed to a first seat body 203, a first sliding seat 204 is slid on the first seat body 203, a pull rod 206 is installed on the first sliding seat 204, a second hydraulic cylinder 205 is fixed to the right end surface of the first seat body 203, the protruding end of the second hydraulic cylinder 205 is fixed to the first sliding seat 204; a second sliding seat 207 is fixed to the top surface of the base 1, a second seat body 208 is slid on the second sliding seat 207, two coil springs 209 are sleeved on the second sliding seat 207, the right ends of the two coil springs 209 are in contact with the second sliding seat 207, and the left ends of the two coil springs 209 are in contact with the second seat body 208; the second seat body 208 is rotated There is a rotating shaft 210, a mounting base 211 is fixed to the left end of the rotating shaft 210, a terminal 212 is fixed to the left end face of the mounting base 211, the terminal 212 is aligned with the pull rod 206, and the terminal 212 is electrically connected to the external power supply. When the stress cone is tested, the stress cone is sleeved on the terminal 212 and the terminal 212 is energized. At this time, the breakdown of the stress cone caused by the discharge at the terminal 212 is observed, and the breakdown test of the stress cone is completed. When it is needed When performing a tensile test on the stress cone, the stress cone is sleeved on the terminal 212 and the pull rod 206, driving the second hydraulic cylinder 205 to contract, and the second hydraulic cylinder 205 drives the first sliding seat 204 and the pull rod 206 to move to the left. At this time, the tensile test of the stress cone can be completed; when the second hydraulic cylinder 205 is damaged and cannot contract, the two first hydraulic cylinders 202 are driven to contract. When the two first hydraulic cylinders 202 contract, they can drive the first seat body 203 to move to the left to complete the emergency tensile test.

[0025] Among them, a worm gear 213 is welded on the rotating shaft 210, and a worm 214 rotates on the second base body 208, and the worm 214 is engaged with the worm gear 213; a first motor 215 is fixed on the second base body 208, and a first motor 215 is fixed on the output shaft of the first motor 215. When the stress cone needs to be subjected to a torsional tensile test, the stress cone is sleeved on the terminal 212 and the pull rod 206 to drive the first motor 215 to rotate, and the first motor 215 drives the worm 214 to rotate. Under the meshing transmission of the worm 214 and the worm gear 213, the torsion and tensile test of the stress cone can be completed, thereby expanding the test range of the stress cone.

[0026] Among them, a force-bearing arm 216 is welded on the right end face of the second base body 208, and the force-bearing arm 216 is an L-shaped structure. A rectangular block-shaped mounting base is fixed on the top surface of the base 1, and a second motor 217 is fixed on the front end face of the mounting base. A driving block 218 is fixed on the output shaft of the second motor 217. When the second motor 217 rotates, the driving block 218 and the force-bearing arm 216 are in a continuous elastic contact state. Under the continuous extrusion of the driving block 218, the force-bearing arm 216 and the second base body 208 are in a left-right reciprocating movement state. The left-right reciprocating movement of the second base body 208 can realize continuous tensile testing of the stress cone, further expanding the test range of the stress cone.

[0027] Among them, the upper end of the driving block 218 is polished, and after polishing, the upper end of the driving block 218 has an arc-shaped structure. During use, the wear of the driving block 218 and the force arm 216 can be reduced, thereby reducing subsequent maintenance costs.

[0028] Among them, the base block 201, the first hydraulic cylinder 202, the first seat body 203, the first sliding seat 204, the second hydraulic cylinder 205, the pull rod 206, the second sliding seat 207, the second seat body 208, the coil spring 209, the rotating shaft 210, the mounting seat 211, the terminal 212, the worm gear 213, the worm 214, the first motor 215, the force arm 216, the second motor 217 and the driving block 218 together constitute the test mechanism 2; the heating mechanism 3 is installed on the second seat body 208.

[0029] Among them, the heating mechanism 3 is composed of a third base body 301 and a heating wire 302. Two third base bodies 301 are fixed on the left end face of the second base body 208. Each third base body 301 is installed with a heating wire 302 in a linear array. The heating wires 302 are electrically connected to an external power supply. The heating wires 302 installed in a linear array are located above and below the pull rod 206 and the terminal 212. During the test, the power supply of the heating wire 302 is turned on, and the heat generated at the heating wire 302 can heat the stress cone. By heating the stress cone, the stress cone can be subjected to a heat aging test, and the stress cone can also be subjected to a breakdown test and a stretching test in a heated state.

[0030] Among them, a scale 101 is embedded in the top surface of the base 1, and the scale 101 is in contact with the first base body 203 and the second base body 208. During the test, the stretching distance can be determined by observing the distance the first base body 203 or the second base body 208 moves on the scale 101.

[0031] Example 2, based on Example 1, Figures 1-8As shown, a protective mechanism 4 is installed on the base 1, and the protective mechanism 4 consists of a third hydraulic cylinder 401, a connecting arm 402 and a protective cover 403. Two third hydraulic cylinders 401 are fixed to the top surface of the base 1, and a connecting arm 402 is fixed to the protruding end of each third hydraulic cylinder 401. The two connecting arms 402 are both L-shaped structures. The two connecting arms 402 are both fixed on the protective cover 403. The protective cover 403 is a rectangular cover-like structure. The protective cover 403 covers the outside of the test mechanism 2 and the heating mechanism 3. During the test, protection during the test can be achieved through the protective cover 403. When replacing the stress cone, it is only necessary to drive the two third hydraulic cylinders 401 to extend, and the two third hydraulic cylinders 401 drive the protective cover 403 to move upward. At this time, the stress cone to be tested can be replaced.

[0032] The working principle of this embodiment is as follows: drive the two third hydraulic cylinders 401 to extend, and the two third hydraulic cylinders 401 drive the protective cover 403 to move upward; connect the stress cone to the terminal post 212, drive the two third hydraulic cylinders 401 to drive the protective cover 403 to move downward to complete the closing of the protective cover 403, and energize the terminal post 212. At this time, observe the breakdown of the stress cone due to the discharge at the terminal post 212, and the breakdown test of the stress cone is completed; when it is necessary to perform a tensile test on the stress cone, connect the stress cone to the terminal post 212 and the pull rod 206, drive the second hydraulic cylinder 205 to retract, and the second hydraulic cylinder 205 drives the first sliding seat 204 and the pull rod 206 to move to the left, and the tensile test of the stress cone can be completed at this time; when the second hydraulic cylinder 205 is damaged and cannot retract, drive the two first hydraulic cylinders 202 to retract, and when the two first hydraulic cylinders 202 retract, they can drive the first seat body 20 3 moves to the left to complete the emergency tensile test; when the stress cone needs to be subjected to a torsional tensile test, the stress cone is sleeved on the terminal 212 and the pull rod 206, and the first motor 215 is driven to rotate. The first motor 215 drives the worm 214 to rotate, and the torsional tensile test of the stress cone can be completed under the meshing transmission of the worm 214 and the worm wheel 213; the second motor 217 is driven to rotate, and the driving block 218 is in a continuous elastic contact state with the force arm 216. Under the continuous squeezing of the driving block 218, the force arm 216 and the second seat body 208 are in a left-right reciprocating state. The left-right reciprocating movement of the second seat body 208 can realize a continuous tensile test of the stress cone; the power supply of the heating wire 302 is turned on, and the heat generated at the heating wire 302 can heat the stress cone. By heating the stress cone, the stress cone can be subjected to a thermal aging test, and the breakdown and tensile test of the stress cone in the heated state can also be realized.

Claims

1. A test device for cable stress cone, characterized in that: include: base; The base is placed on the test bench, and a rectangular block-shaped base block is fixed at the left position of the top surface of the base, and two first hydraulic cylinders are fixed on the right end surface of the base block, and the protruding ends of the two first hydraulic cylinders are fixed on the first base body, and a first sliding seat is slid on the first base body, and a pull rod is installed on the first sliding seat, and a second hydraulic cylinder is fixed on the right end surface of the first base body, and the protruding end of the second hydraulic cylinder is fixed on the first sliding seat; a second sliding seat is fixed on the top surface of the base, and a second base body is slid on the second sliding seat, and two coil springs are sleeved on the second sliding seat, and the right end of the two coil springs is in contact with the second sliding seat, and the left end of the two coil springs is in contact with the second base body; a rotating shaft is rotated on the second base body, and a mounting seat is fixed on the left end of the rotating shaft, and a terminal is fixed on the left end surface of the mounting seat, the terminal is aligned with the pull rod, and the terminal is electrically connected to the external power supply.

2. A cable stress cone test device according to claim 1, characterized in that: A worm wheel is welded on the rotating shaft, a worm is rotated on the second base body, and the worm is engaged with the worm wheel; a first motor is fixed on the second base body, and a first motor is fixed on the output shaft of the first motor.

3. A cable stress cone test device according to claim 2, characterized in that: A force-bearing arm is welded to the right end face of the second base body, and the force-bearing arm is an L-shaped structure. A rectangular block-shaped mounting base is fixed to the top surface of the base, and a second motor is fixed to the front end face of the mounting base. A driving block is fixed on the output shaft of the second motor. When the second motor rotates, the driving block and the force-bearing arm are in a continuous elastic contact state, and under the continuous extrusion of the driving block, the force-bearing arm and the second base body are in a reciprocating left and right movement state.

4. A cable stress cone test device according to claim 3, characterized in that: The upper end of the driving block is polished, and after the polishing, the upper end of the driving block is an arc-shaped structure.

5. A cable stress cone test device according to claim 4, characterized in that: The base block, the first hydraulic cylinder, the first seat body, the first sliding seat, the second hydraulic cylinder, the pull rod, the second sliding seat, the second seat body, the coil spring, the rotating shaft, the mounting seat, the terminal, the worm gear, the worm, the first motor, the force arm, the second motor and the driving block together constitute a testing mechanism; a heating mechanism is installed on the second seat body.

6. A cable stress cone test device according to claim 5, characterized in that: The heating mechanism consists of a third base body and a heating wire. Two third base bodies are fixed on the left end face of the second base body. Each third base body is installed with a heating wire in a linear array. The heating wires are electrically connected to an external power supply. The heating wires installed in a linear array are located above and below the pull rod and the terminal.

7. A cable stress cone test device according to claim 6, characterized in that: A scale is embedded on the top surface of the base, and the scale is in contact with the first base body and the second base body.

8. A cable stress cone test device according to claim 7, characterized in that: A protective mechanism is installed on the base, which consists of a third hydraulic cylinder, a connecting arm and a protective cover. Two third hydraulic cylinders are fixed to the top surface of the base, and a connecting arm is fixed to the protruding end of each third hydraulic cylinder. Both connecting arms are L-shaped structures, and both connecting arms are fixed on the protective cover. The protective cover is a rectangular cover-shaped structure, and the protective cover covers the outside of the testing mechanism and the heating mechanism.

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