Cable bunching alternating torsion test device

Abstract

The utility model discloses a cable bunching alternating torsion test device, which comprises a control cabinet and a test box which is electrically connected with the control cabinet and is suitable for temperature alternating, a torsion test device is arranged in the test box and comprises a fixedly arranged rack, a torsion driving device is fixedly arranged at the top of the rack, and the torsion driving device is connected with the control cabinet. The bottom of the torsion driving device is provided with a load bearing device for loading weight on the cable to be tested in a lifting adjusting manner, and the output end of the torsion driving device and the lower part of the load bearing device are fixedly connected with fixing devices for clamping the cable to be tested. According to the utility model, the real cable use condition can be simulated, and the cable product quality can be more scientifically verified.

Description

Technical Field

[0001] This utility model relates to the field of cable testing technology, and in particular to a cable bundle alternating torsion test device. Background Technology

[0002] Currently, the wind power industry in the new energy sector is developing rapidly. Whether it is onshore or offshore wind power, wind turbines have entered the era of high power. Correspondingly, the power transmission cables used are also moving towards higher voltage levels and higher current carrying capacity. The weight of the cables is also constantly increasing. The reliability of the circuit and the operation of the wind turbine both depend on the quality of the cable itself. During the operation of the wind turbine, it is necessary to ensure the fatigue resistance and quality stability of the cable in different seasons, different natural environments, and the natural swaying of the wind turbine head.

[0003] Traditional methods for torturing wind power cables only conduct tests under single temperature conditions, such as normal or low temperatures, without applying any load during the test. However, the ambient temperature of wind turbines is not constant; it varies with diurnal temperature differences and seasonal changes. In actual operation, the cable is laid more than 100 meters above the wind turbine, and the tortuosity occurs at the turbine head. The cable itself bears the weight of a long length of cable below the tortuosity. Therefore, traditional wind power cable tortuosity tests can no longer accurately reflect the actual working environment and operating conditions of the cable. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a cable bundle alternating torsion test device that simulates real cable usage conditions and provides a more scientific verification of cable product quality.

[0005] The technical solution to achieve the purpose of this utility model is:

[0006] A cable bundle alternating torsion test device includes a control cabinet and a test chamber electrically connected to the control cabinet and adapted to perform temperature alternation. The test chamber is equipped with a torsion test device, which includes a fixed frame. A torsion drive device is fixedly mounted on the top of the frame, and a load device that loads weight onto the cable to be tested is adjustablely mounted on the bottom. Fixing devices for clamping the cable to be tested are fixedly connected to the output end of the torsion drive device and the lower part of the load device.

[0007] Furthermore, the front of the control cabinet is equipped with an equipment display system, a test display system, an operating system, and an external system. The equipment display system is used to display equipment parameters, the test display system is used to display test parameters, the operating system is used to control the operation of the test chamber and the torsion test device, and the external system is used to export data and parameters for data traceability.

[0008] Furthermore, the two fixing devices are arranged symmetrically at the center, and the outlet of the upper fixing device and the inlet of the lower fixing device are both fixedly connected to a torsion bending rail for limiting the bending degree of the cable under test. The two torsion bending rails are arranged symmetrically at the center, and the upper fixing device is fixedly mounted to the output end of the torsion drive device through the upper torsion bending rail.

[0009] Furthermore, the torsional bending track includes a main body with a right-angled fan-shaped structure. The fan-shaped surface of the main body is smooth, and the two sides are symmetrically provided with edges that protrude radially along the main body, forming an arc-shaped channel suitable for placing the cable to be tested.

[0010] Furthermore, the torsion drive device includes a fixed mounting plate, a motor is fixedly connected to the bottom of the mounting plate, a disc is rotatably mounted on the top of the mounting plate, a gear ring is fixedly connected to the bottom of the disc, and a through hole is provided in the center of the disc, penetrating the mounting plate. The output shaft of the motor passes through the mounting plate and is coaxially fixedly connected to a gear that meshes with the gear ring. The torsion bending track is eccentrically mounted on the disc, and the outlet of the arc-shaped channel is directly opposite the through hole.

[0011] Furthermore, the fixing device includes two parallel clamping plates and an adjusting assembly connected between the two clamping plates. One clamping plate is fixedly connected to the corresponding torsional bending track, and the other clamping plate can be raised and lowered by the adjusting assembly.

[0012] Furthermore, the adjustment assembly includes multiple sets of adjustment units arranged along the length of the cable to be tested, and each adjustment unit includes adjustment bolts symmetrically arranged on both sides of the cable to be tested and passing through two clamping plates.

[0013] Furthermore, multiple rubber pressure blocks arranged along the length of the cable are detachably fixed on the opposing surfaces of the two clamping plates. The rubber pressure blocks are located on the side of the adjustment unit, arranged perpendicular to the length of the cable to be measured, and have an arc-shaped groove in the middle.

[0014] Furthermore, the load-bearing device includes a frame, and a load-bearing platform is symmetrically provided at the bottom of the frame. A handwheel screw adjustment assembly is connected between the outer side of the load-bearing platform and the frame, and a load-bearing weight is placed on it.

[0015] Furthermore, rollers are rotatably mounted on the four sides of the frame corresponding to the machine frame, and the outer peripheral surface of the rollers is in contact with the machine frame.

[0016] Furthermore, a limiting ring is fixed in the middle of the frame at the location corresponding to the cable to be tested.

[0017] Furthermore, an operating platform is provided at the top of the frame near the torsion drive device, and a fence is provided around the operating platform.

[0018] By adopting the above technical solution, this utility model has the following beneficial effects:

[0019] (1) This utility model controls the changes in the test chamber through a control cabinet and places the entire torsion test device inside the test chamber, thereby realistically simulating the environment in which the wind turbine cable is located. The torsion drive device used to drive the cable torsion is set at the fixed device located above, thereby realistically simulating the cable torsion occurring at the wind turbine head. A load-bearing device is set at the fixed device below to take into account the large self-weight that the actual cable needs to bear. The overall structure is simple, simulating the actual cable usage conditions, and conducting more scientific verification of the cable product quality. In addition, the load-bearing device can be raised and lowered to meet the load requirements of different cables under test, ensuring that the load can be smoothly applied to the cable.

[0020] (2) By adding a torsional bending track, which is similar to the lead-out arc of the wind turbine cable laying head, this utility model further improves the scientific nature of the test.

[0021] (3) The torsion bending track of this utility model has a smooth track to avoid unnecessary wear on the cable, and a raised edge is provided to limit the cable and prevent the test cable from slipping out of the test device.

[0022] (4) The fixing device of this utility model drives one clamping plate to move closer to or further away from another clamping plate through the adjustment component, thereby realizing the spacing adjustment and clamping the cable to be tested. The structure is simple.

[0023] (5) The adjustment assembly of this utility model is provided with multiple adjustment units composed of adjustment bolts. The structure is simple and the adjustment is convenient. At the same time, the clamping range is increased and the clamping reliability is improved.

[0024] (6) By setting a rubber pressure block with an arc-shaped groove, this utility model can ensure tight contact and fixation, while avoiding cable damage caused by hard contact.

[0025] (7) The load-bearing device of this utility model realizes the up and down lifting through the handwheel screw adjustment assembly, which has a simple structure and is easy to adjust.

[0026] (8) By adding rollers, this utility model achieves rolling contact between the frame and the machine frame, reduces friction, and makes the up and down movement smoother.

[0027] (9) By setting a limiting ring, this utility model ensures that the cable sample under test will not deviate from the entire torsion test device due to the torsion during the test.

[0028] (10) By setting up an operating platform with a fence, this utility model makes it easier for manual clamping of the upper end of the cable sample under test, thereby improving the safety of the test. Attached Figure Description

[0029] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0030] Figure 1 This is a simplified three-dimensional diagram of the present invention;

[0031] Figure 2 This is a simplified front view diagram of the present invention;

[0032] Figure 3 This is a simplified structural diagram of the torsion testing device of this utility model;

[0033] Figure 4 This is a simplified structural diagram of the torsion testing device of this utility model from the left view.

[0034] Figure 5 This is a simplified structural diagram of the load-bearing device of this utility model;

[0035] Figure 6 This is a simplified structural diagram of the fixing device of this utility model.

[0036] The labels in the attached diagram are:

[0037] 1. Control cabinet; 1-1. Equipment display system; 1-2. Test display system; 1-3. Operating system; 1-4. External system; 2. Test chamber; 2-1. Chamber door; 2-2. Connecting device; 2-3. Horizontal door handle; 2-4. Vertical door handle; 3. Frame; 4. Drive device; 4-1. Mounting plate; 4-2. Disc; 5. Loading device; 5. Frame body; 5-1. Loading weight; 5-2. Roller; 5-3. Fixing device; 6. Clamping plate; 6-1. Adjusting bolt; 6-2. Rubber pressure block; 6-3. Torsional bending track; 7. Main body; 7-1. Edge; 7-2. Limiting ring; 8. Operating platform; 9. Fence; 10. Detailed Implementation

[0038] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0039] (Example 1)

[0040] like Figures 1 to 6The cable bundle alternating torsion test apparatus shown includes a control cabinet 1, a test chamber 2 electrically connected to the control cabinet 1, and a torsion test device located inside the test chamber 2. The torsion test device includes a frame 3, a torsion drive device 4, a load-bearing device 5, and a fixing device 6. The frame 3 is fixedly mounted, the torsion drive device 4 is fixedly mounted on the top of the frame 3, the load-bearing device 5 is adjustablely positioned at the bottom of the frame 3, and two fixing devices 6 are located at the output end of the torsion drive device 4 and the lower part of the load-bearing device 5, respectively. The control cabinet 1 controls the alternating temperature inside the test chamber 2 to realistically simulate the environment of the wind turbine cable. The two fixing devices 6 clamp both ends of the cable sample to be tested, and the torsion drive device 4 drives the upper fixing device 6 to twist, thus achieving torsion at the upper end of the cable, realistically simulating cable torsion occurring at the wind turbine head. The load-bearing device 5 applies weight to the cable sample to simulate the significant self-weight that a real cable needs to withstand. The overall structure is simple, simulating real cable usage conditions, and providing a more scientific verification of cable product quality.

[0041] Specifically, the front of control cabinet 1 is equipped with an equipment display system 1-1, a test display system 1-2, an operating system 1-3, and an external system 1-4. The equipment display system 1-1 is used to display equipment parameters, the test display system 1-2 is used to display test parameters, the operating system 1-3 is used to control the operation of the test chamber and the torsion test device, and the external system 1-4 is used to export data and parameters for data traceability.

[0042] Both control cabinet 1 and test chamber 2 have their outer structures made of corrosion-resistant lightweight metal materials, while the inner wall of test chamber 2 is made of corrosion-resistant stainless steel. Test chamber 2 is a temperature-adjustable alternating temperature testing device, similar to a common large seasonal testing chamber. Different high and low temperature alternation, high temperature alone, low temperature alone, or ambient temperature test temperature cycle parameters can be set according to the testing scenario. Humidity parameters can also be set according to the actual laying scenario. The lowest temperature can be set to -50℃ to meet the extreme low temperature requirements of different regions and day and night temperatures. The highest temperature can be set to 100℃ to meet the actual operating scenarios of different ambient temperatures and the maximum operating temperature of cables. The maximum humidity is set to 85%RH. Test chamber 2 has a rectangular structure, with a length and width not exceeding 2 meters and a height not exceeding 3 meters, featuring a small footprint and easy installation and operation. The front of test chamber 2 has a door 2-1 with a height of at least 2 meters and a width of at least 1 meter, facilitating the smooth passage of operators and cable samples to be tested. The right side of the chamber door 2-1 is connected to the main body of the test chamber 2 through multiple sets of connecting devices 2-2, which serve as a support. The left side of the chamber door 2-1 of the test chamber is equipped with a horizontal door handle 2-3 and a vertical door handle 2-4, and the chamber door 2-1 and the main body of the test chamber 2 are tightly fitted together by a high-temperature resistant silicone sealing strip.

[0043] The torsion drive device 4 includes a mounting plate 4-1 fixedly mounted on the top of the frame 3. A motor is fixedly connected to the bottom of the mounting plate 4-1, and a disc 4-2 is rotatably mounted on the top. A gear ring is fixedly connected to the bottom of the disc 4-2, and a through hole is provided in the center of the disc 4-1, through which the cable sample to be tested passes. The output shaft of the motor passes through the mounting plate 4-1 and is coaxially fixed to a gear that meshes with the gear ring, thereby driving the disc 4-2 to rotate.

[0044] The load-bearing device 5 includes a frame 5-1, with a load-bearing platform symmetrically arranged at the bottom of the frame 5-1. A handwheel and screw adjustment assembly is connected between the outer side of the load-bearing platform and the frame, and a load weight 5-2 is placed on it. The lifting and lowering of the load-bearing device 5 is adjusted by the handwheel and screw adjustment assembly, allowing it to load the weight onto the cable sample to be tested. Rollers 5-3 are rotatably mounted on the surfaces of the frame 5-1 corresponding to the frame 3. The outer circumference of the rollers 5-3 contacts the frame 3, achieving rolling contact between the frame 5-1 and the frame 3, reducing friction and making the up-and-down movement smoother.

[0045] The upper surface of the disc 4-2 and the lower surface of the frame 5-1 are both fixedly connected to the torsion bending rails 7. The two torsion bending rails 7 are arranged in a centrally symmetrical manner. The two fixing devices 6 are respectively installed on the disc 4-2 and the load-bearing device 5 through the two torsion bending rails 7, and are also arranged in a centrally symmetrical manner. The torsion bending rail 7 includes a main body 7-1 with a right-angled fan-shaped structure. The fan-shaped surface of the main body 7-1 is smooth, and the two sides are symmetrically provided with radially protruding edges 7-2 along the main body 7-1, forming an arc-shaped channel suitable for placing the cable to be tested. The upper torsion bending rail 7 is eccentrically installed on the disc 4-2. The arc-shaped channel is arranged radially along the disc 4-2, with the outlet facing the through hole and the inlet facing the outlet of the fixing device 6, so that when the disc 4-2 rotates, it drives the cable clamped by the fixing device 6 to twist. In order to prevent the cable from twisting and deviating from the entire torsion test device, in this embodiment, a limiting ring 8 is fixedly provided in the middle of the frame 1 at the position corresponding to the cable to be tested.

[0046] The fixing device 6 includes two parallel clamping plates 6-1 and an adjusting assembly connecting the two clamping plates 6-1. One clamping plate is fixedly connected to a corresponding torsional bending track, while the other clamping plate can be raised and lowered via the adjusting assembly. The adjusting assembly includes multiple sets of adjusting units arranged along the length of the cable under test, thereby extending the clamping range and improving the reliability of cable clamping. Each adjusting unit includes adjusting bolts 6-2 symmetrically arranged on both sides of the cable under test and penetrating the two clamping plates 6-1. By rotating the adjusting bolts 6-2, the two clamping plates 6-1 are moved closer and further apart to clamp the cable. Considering that the cable cross-section is circular, this embodiment detachably fixes multiple rubber pressure blocks 6-3 arranged along the cable length on the opposite surfaces of the two clamping plates 6-1. The rubber pressure blocks 6-3 are located on the side of the adjusting unit, arranged perpendicular to the length of the cable under test, and have an arc-shaped groove in the middle, which ensures close contact and fixation with the cable while avoiding cable damage caused by hard contact. In addition, the rubber clamp 6-3 is detachable and easy to replace, meeting the clamping requirements of cables of different diameters.

[0047] Considering that the fixing device 6 located above is too high and not convenient for clamping operations, this embodiment provides an operating platform 9 at the top of the frame 3 near the torsion drive device 4, and the outer perimeter of the operating platform 9 is provided with a fence 10, which facilitates manual clamping of the upper end of the cable sample under test and improves the safety of the test.

[0048] The steps for testing cable samples using this testing apparatus are as follows:

[0049] Step 1: Set parameters, test temperature, test humidity, etc. according to the test conditions. The temperature can be set according to the actual operating conditions of the cable. For example, you can select 80% humidity, low temperature -40℃ for 4 hours, low temperature -20℃ for 2 hours, and high temperature 40℃ for 6 hours. This is one cycle, and the number of cycles should be set at the same time.

[0050] Step 2: Prepare a 5-meter test sample, bundle multiple samples together for testing, and ensure that the cable is the same type and specification as the actual cable being laid; take 2 meters and test its conductor resistance, insulation resistance and other electrical properties according to the standard. When the length is long enough, the mechanical properties of the material layers that make up the cable can also be increased.

[0051] Step 3: Place the remaining 3 meters of the test sample bundled cable onto the operating platform 9, and the operators simultaneously arrive at the corresponding positions;

[0052] The test bundle sample is installed on the upper fixing device 6 according to the sample size. A suitable rubber pressure block 6-3 is selected for cable fixing. The cable sample is then passed through the upper torsion bending track 7, the through hole of the disc 4-2, the limiting ring 8, the load-bearing device 5, and the lower torsion bending track 7 in sequence, and then fixed to the lower fixing device 6 to complete the test installation.

[0053] Step 4: Close chamber door 2-1 of test chamber 2 to seal the test chamber, and personnel should exit. Set the torsion test parameters, such as torsion angle, torsion direction, torsion speed, torsion frequency, and torsion cycle, through control cabinet 1. Start the test after the temperature and humidity parameters of test chamber 2 reach stable test conditions.

[0054] Step Six: After the test, open chamber door 2-1 of test chamber 2 to allow the equipment and cable temperature to return to room temperature. Check for cracks on the cable surface after operating under the test conditions. Peel off the sheath and check for cracks on the insulation surface. Remove the insulation to check if the cable conductor is completely broken or partially broken. At the same time, test the conductor resistance, cable insulation resistance, and other electrical properties, as well as the mechanical properties of the insulation and sheath, in a scientific order. Each cable in the bundled cable needs to be tested according to Step Nine, and the data should be compared with the data before the bundled temperature and humidity alternating torsion test to evaluate the loss of various performance before and after the test. Finally, export and save the test parameters and records through external system 1-4.

[0055] This invention uses a control cabinet 1 to control the changes in the test chamber 2, placing the entire torsion test device inside the chamber to realistically simulate the environment of a wind turbine cable. A torsion drive device 4, used to drive the cable torsion, is positioned at the upper fixed device 6, thus realistically simulating cable torsion occurring at the wind turbine head. A load-bearing device 5 is installed at the lower fixed device 6 to accommodate the substantial weight that a real cable would need to withstand. The overall structure is simple, simulating real cable operating conditions for more scientific verification of cable product quality. Furthermore, the load-bearing device 6 is adjustable in height to meet the different load requirements of the cables under test, ensuring that the load is smoothly applied to the cable.

[0056] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cable bundle alternating torsion test apparatus, characterized by: The utility model provides a test box and control cabinet for cable torsion test, which comprises a control cabinet and a test box electrically connected with the control cabinet and adapted to perform temperature alternation, a torsion test device is arranged in the test box, the torsion test device comprises a fixed rack, a torsion driving device is fixedly arranged on the top of the rack, a weight loading device for loading weight on the cable to be tested is adjustably arranged on the bottom of the rack, and a fixing device for clamping the cable to be tested is fixedly connected to the output end of the torsion driving device and the lower part of the weight loading device.

2. A cable bundle alternating torsion test apparatus according to claim 1, characterized in that: The two fixing devices are arranged in a central symmetry, a torsion bending track for limiting the bending degree of the cable to be tested is fixedly connected to the outlet of the upper fixing device and the inlet of the lower fixing device, the two torsion bending tracks are arranged in a central symmetry, and the upper fixing device is fixed to the output end of the torsion driving device through the upper torsion bending track.

3. A cable bundle alternating torsion test apparatus according to claim 2, wherein: The torsion bending track comprises a main body in a straight-angle sector structure, the sector surface of the main body is smooth, and the two sides are symmetrically provided with edges protruding in the radial direction of the main body, forming an arc-shaped channel suitable for placing the cable to be tested.

4. A cable bunching and alternate torsion testing apparatus as defined in claim 1 wherein: The fixing device comprises two clamping plates arranged in parallel and an adjusting assembly connected between the two clamping plates, one of the clamping plates is fixedly connected with the corresponding torsion bending track, and the other clamping plate is arranged in an up-down adjustable manner through the adjusting assembly.

5. A cable bunching and alternate torsion test apparatus as claimed in claim 4, wherein: The adjusting assembly comprises a plurality of adjusting units arranged in the length direction of the cable to be tested, and the adjusting unit comprises adjusting bolts symmetrically arranged on both sides of the cable to be tested and penetrating through the two clamping plates.

6. A device for testing the bunching of an electrical cable to alternating torsion according to claim 5, characterized in that: A plurality of rubber pressing blocks arranged in the length direction of the cable are detachably fixed to the opposite surfaces of the two clamping plates, the rubber pressing blocks are located on the side of the adjusting unit, are arranged in the direction perpendicular to the length direction of the cable to be tested, and have arc-shaped grooves in the middle.

7. A device for testing the bunching of an electrical cable to alternating torsion according to claim 1, characterized in that: The weight loading device comprises a frame, a weight loading platform is symmetrically arranged on the bottom of the frame, a hand wheel screw adjusting assembly is connected between the outer side of the weight loading platform and the rack, and a weight loading weight is placed on the hand wheel screw adjusting assembly.

8. A cable bunching and alternate torsion test apparatus as claimed in claim 7, wherein: Rollers are rotatably installed on the surfaces corresponding to the rack around the frame, and the outer circumferential surfaces of the rollers are in contact with the rack.

9. A cable bunching and alternate torsion testing apparatus as defined in claim 1 wherein: A limiting ring is fixedly arranged on the middle part of the rack corresponding to the cable to be tested.

10. A cable bunching and alternate torsion testing apparatus as defined in claim 1 wherein: An operation platform is arranged on the top of the rack close to the torsion driving device, and a fence is arranged on the outer periphery of the operation platform.

Images