Testing device and testing method of cable for direct current charging pile

Abstract

The invention discloses a testing device and a testing method for a cable for a direct current charging pile, and belongs to the technical field of charging pile cables, the testing device comprises a support, a torsion device and a stretching device, and the position of the stretching device on the support can be adjusted; the stretching device comprises a fixing block and a sliding rail, the bottom of the sliding rail is connected with the support, and the fixing block is arranged at the top of the sliding rail. The torsion device comprises a torsion motor, a torsion rod and a torsion disc; a hole for accommodating the torsion rod is formed in the top of the bracket; the torsion motor can rotate the torsion rod to drive the torsion disc to rotate. According to the invention, the twisting device is arranged at the top of the support, the stretching device is arranged in the middle of the support, the twisting device can twist a cable, and the twisted cable can be stretched through the stretching device. The cable twisting and stretching combined testing device can perform twisting and stretching combined testing on the cable and simulate the use conditions under various working conditions, so that the durability and other performances of the cable can be evaluated more comprehensively.

Description

Technical Field

[0001] The invention relates to a testing device and a testing method for a cable for a DC charging pile, and belongs to the technical field of charging pile cables. Background Art

[0002] With the rapid development of new energy vehicles, the market demand for DC charging piles, as key equipment for providing power for electric vehicles, continues to increase. In the entire system of DC charging piles, charging cables are an important channel for transmitting electrical energy. The overall quality of charging cables affects the charging efficiency, charging safety, and the overall stability of the system. The cables used in charging piles face the problems of high current and high voltage in the actual use environment, and are often exposed outdoors. The cable body is prone to aging and mechanical damage, which affects the safety and service life of the charging piles.

[0003] At present, the quality inspection of cables is usually the inspection of static parameters. The experimental conclusions obtained from the test in a static environment are different from the life of the cables actually used. After long-term use, the cables are exposed to high temperature, bending and other reasons, which leads to performance degradation. There are certain defects in the current experimental devices for testing cables. Most of the measurement methods are static and cannot simulate the stretching, twisting and other usage conditions of the cables during actual use. Therefore, it is necessary to design a design for the twisting and stretching of the cable for DC charging piles, which is used to simulate the number of twisting and stretching times generated during the actual use of the DC charging pile cable. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a testing device and a testing method for a cable for a DC charging pile, which solves the problem of inaccurate detection of the cable of the DC charging pile.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions: A test device for a cable for a DC charging pile, comprising:

[0006] Brackets, torsion devices, stretching devices,

[0007] The stretching device and the twisting device are both arranged on the bracket.

[0008] The torsion device is arranged on the top of the bracket, the stretching device is arranged in the middle of the bracket by bolts, and the position of the stretching device on the bracket can be adjusted;

[0009] The stretching device comprises a fixed block and a slide rail, the bottom of the slide rail is connected to the bracket, and the top of the slide rail is provided with the fixed block;

[0010] The torsion device comprises a torsion motor, a torsion rod and a torsion plate. The top of the bracket is provided with a hole for accommodating the torsion rod. The torsion motor is provided at one end of the torsion rod and the torsion plate is provided at the other end of the torsion rod.

[0011] The center of the torsion plate and the center of the fixed block are located on the same straight line;

[0012] The fixing block can move along the direction of the slide rail, and a hole for fixing the cable to be detected is provided in the middle of the fixing block;

[0013] The torsion motor can rotate the torsion rod to drive the torsion disk to rotate.

[0014] Preferably, a torsion assembly is arranged inside the torsion disk, and the torsion assembly comprises a guide rail, a sliding block, a torsion block, a driving block, and a locking block. The guide rails are arranged at both ends of the sliding block, a hole for accommodating the torsion block is arranged in the middle of the sliding block, the torsion block is fixed in the middle of the sliding block, the driving block is connected to the torsion block, a hole for accommodating the locking block is arranged in the middle of the driving block, and the locking block is arranged on the torsion block;

[0015] The sliding block can move along the guide rail, and the driving block can drive the torsion block to rotate;

[0016] The torsion assembly can fix the cable to be tested and apply torsion to the cable.

[0017] Preferably, the locking block is a semicircular ring structure, there are two locking blocks, and a fixing key is provided in the middle of the outer side of one of the locking blocks.

[0018] Preferably, a fixing pin is provided in the middle of the torsion block, and the torsion block and the locking block are connected via the fixing pin and the fixing key, so that no rotational misalignment occurs.

[0019] Preferably, a plurality of teeth are arranged on the inner side of the locking block ring, and two locking blocks can fix the cable to be detected after being combined.

[0020] Preferably, the inner ring of the locking block has various sizes, so as to fix cables of different diameters.

[0021] Preferably, one end of the driving block is connected to a motor, and power is provided by the motor.

[0022] Preferably, the torsion assembly can reciprocate between the edge of the torsion disk and the middle of the torsion disk via the guide rail.

[0023] A testing method for a testing device of a cable for a DC charging pile, preferably,

[0024] The following steps are involved:

[0025] Step 1: Setting the fixing block on a side of the slide rail away from the twisting device;

[0026] Step 2: placing the torsion assembly in the middle of the torsion disk;

[0027] Step 3: confirm the length of the cable to be tested, and adjust the position of the stretching device on the bracket so that the distance between the stretching device and the torsion device is the length of the cable to be tested;

[0028] Step 4: Fix one end of the cable to be tested in the middle of the fixing block, and fix the other end in the torsion assembly through the locking block;

[0029] Step 5: Move the fixed block to one side of the slide rail close to the twisting device;

[0030] Step 6: Move the torsion assembly to the edge of the torsion disk;

[0031] Step 7: The torsion motor drives the torsion disk to rotate, and stops rotating after rotating at least half a circle, and the torsion assembly moves to the middle of the torsion disk;

[0032] Step 8: The fixing block moves to a side of the slide rail away from the twisting device.

[0033] Preferably, in step 7, the driving block continuously drives the torsion block to rotate along the rotation direction of the torsion disk.

[0034] The beneficial effects of the present invention are:

[0035] (1) According to the present invention, a torsion device is provided at the top of the bracket, and a stretching device is provided at the middle of the bracket. The torsion device can twist the cable, and the twisted cable can be stretched by the stretching device. The cable can be subjected to a combined torsion and stretching test, simulating the use under various working conditions, so as to more comprehensively evaluate the durability and other performances of the cable.

[0036] (2) Through the present invention, the stretching device arranged in the middle of the bracket can adjust the position on the bracket. In the torsion device and the stretching device arranged at the top of the bracket, the centers of the torsion disk of the torsion device and the fixed block of the stretching device are all in the same straight line. The stretching device arranged in the middle of the bracket is fixed to the bracket by bolts. The contact bolt locking can be moved to a new position and fixed again with bolts. The distance between the torsion device and the stretching device can be adjusted according to the length of the cable with measurement. The test lengths of cables used in charging piles of different models are inconsistent. By adjusting the distance between the torsion device and the stretching device, different models of cables can be adapted. After the position is adjusted, the centers of the torsion disk and the fixed block of the torsion device and the stretching device are all in the same straight line, which can reduce the errors caused by multiple experiments.

[0037] (3) According to the present invention, a torsion assembly is arranged in the torsion disk, and the torsion assembly includes a guide rail, a sliding block, a torsion block, a driving block, and a locking block. Through the cooperation of the guide rail and the sliding block, the torsion assembly can move smoothly along the guide rail, ensuring precise control during the torsion process, avoiding additional friction and shaking, and improving the stability of the test and the accuracy of the data; the locking block in the middle of the driving block can fix the cable to prevent accidental rotation, thereby ensuring the safety of the cable during the operation process before and after the test; the driving block drives the automatic rotation of the torsion block, reducing manual intervention, improving the test efficiency, and is suitable for large-scale, multi-batch cable torsion performance testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the present invention.

[0039] Figure 2 A schematic diagram of the side structure of the present invention

[0040] Figure 3 It is a schematic structural diagram of the torsion assembly of the present invention.

[0041] Figure 4 It is a schematic structural diagram of the torsion block in the torsion assembly of the present invention.

[0042] In the figure: 1- bracket, 2- torsion device, 21- torsion motor, 22- torsion rod, 23- torsion disk, 231- sliding block, 232- torsion block, 233- driving block, 234- locking block, 3- stretching device, 31- slide rail, 32- fixed block. DETAILED DESCRIPTION

[0043] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0044] Example 1

[0045] like Figure 1-Figure 4As shown, a testing device for a cable for a DC charging pile includes a bracket 1, a torsion device 2, and a stretching device 3, wherein the torsion device 2 is arranged on the top of the bracket 1, and the stretching device 3 is arranged in the middle of the bracket 1.

[0046] In this embodiment, the bracket 1 is L-shaped, with the horizontal part longer than the vertical part, and a plurality of screw holes are provided on the bracket 1 in the horizontal direction, and the screw holes can fix the stretching device 3. A hole for accommodating the twisting device 2 is provided at the top edge of the bracket 1 in the vertical direction, and the twisting device 2 is fixed in the hole in the vertical direction of the bracket 1.

[0047] The stretching device 3 includes a slide rail 31 and a fixed block 32. A platform is provided at the bottom of the slide rail 31. Bolts are provided at the bottom of the platform. The bolts can cooperate with the screw holes in the horizontal direction of the bracket 1 and be fixed in the horizontal direction of the bracket 1. A fixed block 32 is provided at the top of the slide rail 31. A moving motor is provided inside the fixed block 32. The fixed block 32 moves along the slide rail 31 through the moving motor. In this embodiment, the structure of the slide rail 31 is rectangular, and the top of the rectangle is concave inward; and grooves concave inward are provided on both sides of the rectangle. The shape of the connection between the bottom of the fixed block 32 and the slide rail 31 is consistent with the overall shape of the slide rail 31. The bottom of the fixed block 32 only covers the bottom of the groove on the side of the slide rail 31 at the matching point with the slide rail 31, and is not in the same plane as the bottom of the slide rail 31, and does not contact the platform at the bottom of the slide rail 31, so as to reduce wear. A hole penetrating the middle is provided on the inner side of the slide rail 31, and the slide rail 31 is fixed to the platform at the bottom by bolts.

[0048] The top of the fixing block 32 is provided with a fixing structure for fixing the cable, specifically two semicircular rings protruding forward, and the semicircular rings can be connected to each other to fix the cable. The center of the semicircular rings after connection is on the same axis as the center of the twisting device 2.

[0049] The torsion device 2 includes a torsion motor 21, a torsion rod 22, and a torsion disk 23. The torsion device 2 is fixed on the bracket 1. A hole for accommodating the torsion device 2 is provided at the top edge of the bracket 1 in the vertical direction, wherein the torsion rod 22 can be fixed in the hole at the top of the bracket 1. In the torsion device 2, the torsion rod 22 is fixed in the hole at the top of the bracket 1. A torsion disk 23 is provided at one end of the torsion rod 22 close to the stretching device 3, and a torsion motor 21 is provided at one end of the torsion rod 22 away from the stretching device 3. The torsion rod 22 is fixedly connected to the torsion disk 23, and the torsion disk 23 rotates with the torsion rod 22, and the torsion motor 21 drives the torsion rod 22 to rotate. The center of the torsion disk 23 and the center of the fixed block 32 of the stretching device 3 are on the same axis.

[0050] A torsion assembly is disposed inside the torsion disk 23, and the torsion assembly can move from the edge of the torsion disk 23 to the center of the circle. When the torsion disk 23 rotates, the torsion assembly can be driven to rotate along the edge of the torsion disk 23. The torsion assembly can fix the cable and rotate the fixed part to apply torque to the cable.

[0051] The torsion assembly includes a guide rail, a sliding block 231, a torsion block 232, a driving block 233, and a locking block 234. There are two slide rails, and grooves for accommodating the slide rails are arranged on both sides of the sliding block 231; the torsion block 232 is arranged in the middle of the sliding block 231 and protrudes a part; in the protruding part of the torsion block 232, a driving block 233 is arranged, and the driving block 233 can drive the torsion block 232 to rotate; the locking block 234 is arranged inside the torsion block 232, and the locking block 234 can connect the cable and fix the cable in the middle of the sliding block 232. The driving block 233 drives the torsion block 232 to rotate on the sliding block 231, which can rotate the cable and provide a certain torque for the cable.

[0052] In this embodiment, the bottom ends of both sides of the slide rail are recessed inward, and both ends of the sliding block 231 can be connected to the guide rail and move on the guide rail. The sliding block 231 is H-shaped as a whole, and grooves connected to the guide rail are provided on both sides. A reciprocating motor is provided inside the sliding block 231, and the reciprocating motor can adjust the position of the sliding block 231 on the guide rail. The guide rail is fixed in the torsion disk 23 and is located on the radius of the torsion disk 23; the sliding block 231 can move on the guide rail, drive the torsion assembly to move from the edge of the torsion disk 23 to the center of the torsion disk 23, and can reciprocate.

[0053] Reference Figure 4 A hole for accommodating the torsion block 232 is provided in the middle of the sliding block 232. The torsion block 232 is cylindrical, and a plurality of protruding teeth are provided on the outer side of the cylinder, and the teeth cover the outer half of the torsion block 232. A hole is provided in the middle of the torsion block, and a fixing pin is provided at the edge of the hole; the hole can accommodate the locking block 234. In this embodiment, the number of the fixing pin is one, and the side of the torsion block 232 without the teeth is fixed to the middle of the sliding block 231, and when the torsion block 232 rotates, the sliding block 231 does not rotate.

[0054] The torsion block 232 not fixed to the outside of the sliding block 231 is connected to the driving block 233, and the driving block 233 can provide rotational power for the torsion block 232. In this embodiment, the top of the driving block 233 is connected to a motor, and the motor drives the driving block 233 to rotate, and the power is provided by the motor.

[0055] A locking block 234 is provided in the middle of the torsion block 232. The locking block 234 can connect the cable and fix the cable on the torsion block 232. In this embodiment, the locking block 234 is a semicircular ring structure, and there are two locking blocks 234. After the locking blocks 234 are connected, a ring is formed, and the cable to be tested can be fixed inside the ring. A plurality of teeth are arranged on the inner surface of the locking block 234. The locking block 234 fixes the point cable through the inner teeth. When a torque is applied to the cable, the teeth can prevent the cable from rotating accidentally, thereby ensuring the safety of the cable during the operation before and after the test.

[0056] A fixing key is provided in the middle of the outer side of the circular ring of one of the locking blocks 234, and the fixing key can be matched and connected with the fixing pin in the middle of the torsion block 232 without causing rotational dislocation.

[0057] There are many types of cables produced, and some different types of cables have different sizes. There are also many types of locking blocks 234. The inner diameters of the rings of different types of locking blocks 234 are different, and the outer diameters of the rings are the same. They can all be fixed inside the torsion block 232. Different types of locking blocks 234 can fix cables to be tested with different diameters.

[0058] One end of the cable is fixed to the torsion device 2, and the other end of the cable is fixed to the tension device 3. Through the cooperation of the torsion device 2 and the tension device 3 arranged on the bracket 1, the cable can be stretched and twisted, and the force applied to the cable during actual use can be measured.

[0059] By testing the cable, we can determine the service life of the cable after stretching and torsion, and judge whether the cable meets the production requirements.

[0060] The specific test method is:

[0061] Step 1: Set the fixing block 32 on the side of the slide rail 31 away from the twisting device 2;

[0062] Step 2: Arrange the torsion assembly in the middle of the torsion disk 23;

[0063] Step 3: Confirm the length of the cable to be tested, and adjust the position of the stretching device 3 on the bracket 1 so that the distance between the stretching device 1 and the torsion device 2 is the length of the cable to be tested;

[0064] Step 4: Fix one end of the cable to be tested in the middle of the fixing block 32, and fix the other end in the torsion assembly through the locking block 234;

[0065] Step 5: Move the fixing block 32 to one side of the slide rail close to the twisting device 2;

[0066] Step 6: Move the torsion assembly to the edge of the torsion disk 23;

[0067] Step 7: The torsion motor 31 drives the torsion disk 23 to rotate, and stops rotating after rotating at least half a circle, and the torsion assembly moves to the middle of the torsion disk 23;

[0068] Step 8: The fixing block 32 moves to the side of the slide rail away from the twisting device 2 .

[0069] In step 7 , the driving block 233 continuously drives the torsion block 232 to rotate along the rotation direction of the torsion disk 23 .

[0070] Step 7 can twist the tested cable, and after the twisting is completed, the cable is stretched through step 8. After the cable is manufactured, the quality standard used is required to measure the quality of the cable. In this embodiment, the motor connected to the drive block 233 can adjust the set torque, and the motor inside the fixed block 32 can adjust the output tension to ensure that the cable is quality tested within the standard that meets the production requirements, prevent the output torque and tension from being too large to cause misjudgment, affect the detection quality, and more comprehensively evaluate the durability and performance of the cable.

[0071] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A test device for a DC charging pile cable, comprising: Brackets, torsion devices, stretching devices, The stretching device and the twisting device are both arranged on the bracket. Features: The torsion device is arranged on the top of the bracket, the stretching device is arranged in the middle of the bracket by bolts, and the position of the stretching device on the bracket can be adjusted; The stretching device comprises a fixed block and a slide rail, the bottom of the slide rail is connected to the bracket, and the top of the slide rail is provided with the fixed block; The torsion device comprises a torsion motor, a torsion rod and a torsion plate. The top of the bracket is provided with a hole for accommodating the torsion rod. The torsion motor is provided at one end of the torsion rod and the torsion plate is provided at the other end of the torsion rod. The center of the torsion plate and the center of the fixed block are located on the same straight line; The fixing block can move along the direction of the slide rail, and a hole for fixing the cable to be detected is provided in the middle of the fixing block; The torsion motor can rotate the torsion rod to drive the torsion disk to rotate.

2. A test device for a DC charging pile cable according to claim 1, characterized in that: A torsion assembly is arranged inside the torsion disk, and the torsion assembly includes a guide rail, a sliding block, a torsion block, a driving block, and a locking block. The guide rails are arranged at both ends of the sliding block, a hole for accommodating the torsion block is arranged in the middle of the sliding block, the torsion block is fixed in the middle of the sliding block, the driving block is connected to the torsion block, a hole for accommodating the locking block is arranged in the middle of the driving block, and the locking block is arranged on the torsion block; The sliding block can move along the guide rail, and the driving block can drive the torsion block to rotate; The torsion assembly can fix the cable to be tested and apply torsion to the cable.

3. A test device for a DC charging pile cable according to claim 2, characterized in that: The locking block is a semicircular ring structure, there are two locking blocks, and a fixing key is arranged in the middle of the outer side of one of the locking blocks.

4. A test device for a DC charging pile cable according to claim 3, characterized in that: A fixing pin is arranged in the middle of the torsion block, and the torsion block is connected with the locking block through the fixing pin and the fixing key, so that no rotational misalignment occurs.

5. A test device for a DC charging pile cable according to claim 3, characterized in that: A plurality of teeth are arranged on the inner side of the locking block ring, and two locking blocks can be combined to fix the cable to be detected.

6. A test device for a DC charging pile cable according to claim 5, characterized in that: The inner ring of the locking block has various sizes and can fix cables of different diameters.

7. A test device for a DC charging pile cable according to claim 5, characterized in that: One end of the driving block is connected to the motor, and power is provided by the motor.

8. A test device for a DC charging pile cable according to claim 2, characterized in that: The torsion assembly can reciprocate between the edge of the torsion plate and the middle of the torsion plate through the guide rail.

9. A method for testing a test device for a DC charging pile cable, wherein the method for testing a test device for a DC charging pile cable is implemented by using the test device for a DC charging pile cable according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Setting the fixing block on a side of the slide rail away from the twisting device; Step 2: placing the torsion assembly in the middle of the torsion disk; Step 3: confirm the length of the cable to be tested, and adjust the position of the stretching device on the bracket so that the distance between the stretching device and the torsion device is the length of the cable to be tested; Step 4: Fix one end of the cable to be tested in the middle of the fixing block, and fix the other end in the torsion assembly through the locking block; Step 5: Move the fixed block to one side of the slide rail close to the twisting device; Step 6: Move the torsion assembly to the edge of the torsion disk; Step 7: The torsion motor drives the torsion disk to rotate, and stops rotating after rotating at least half a circle, and the torsion assembly moves to the middle of the torsion disk; Step 8: The fixing block moves to a side of the slide rail away from the twisting device.

10. The testing method of a testing device for a DC charging pile cable according to claim 9, characterized in that: In step 7, the driving block continuously drives the torsion block to rotate along the rotation direction of the torsion disk.

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