Conductor DC resistance testing device

Abstract

A conductor DC resistance testing device disclosed by the present invention comprises a detection table, a detection bridge, two first clamps and two second clamps, a cavity layer is arranged in the detection table, an S-shaped bent electric heating tube is arranged in the cavity layer, and wrapping covers used for wrapping the detection table after being folded are arranged on both sides of the detection table. First connecting lugs are arranged at the two ends of the wrapping cover, connecting holes are formed in the first connecting lugs, a rotating shaft penetrating through the connecting holes is arranged on the detection table, and a thermometer is arranged on the inner wall of the wrapping cover. After being combined, the two wrapping covers can wrap the outer side of the detection table, the electric heating pipes heat the space in the wrapping covers, meanwhile, the thermometers are used for monitoring the change of the temperature in the wrapping covers, and after the temperature is controlled to range from 15 DEG C to 25 DEG C and is stabilized for a period of time, conductor resistance testing can be conducted on the cable. And finally, the ambient temperature around the cable can be always controlled between 15 DEG C and 25 DEG C, so that the measurement accuracy can be improved.

Description

Technical Field

[0001] This invention belongs to the field of resistance testing technology, and specifically relates to a device for testing the DC resistance of a conductor. Background Technology

[0002] Conductor resistance is one of the core indicators for evaluating the performance of cables. It directly affects the current carrying capacity, heating conditions, and energy efficiency of cables. In modern experiments, digital bridges are instruments that can measure inductance, capacitance, resistance, and impedance.

[0003] Currently, Chinese patent publication number CN218412619U, published on January 31, 2023, discloses a cable testing device, including a testing platform and a testing bridge. The testing bridge is located on one side of the testing platform. A pair of mounting seats are fixedly installed on the top of the testing platform. The pair of mounting seats are located on both sides of the top of the testing platform. A pair of sliding grooves are horizontally arranged on the top of the mounting seats. A slider is movably installed inside the sliding groove. A movable clamp is fixedly connected to the top of the slider. A fixed clamp is fixedly installed on the top of the mounting seat on one side of the sliding groove. The interior of each pair of mounting seats has a vertically opened mounting groove near one end of the sliding groove, and a rotating rod is movably installed between the pair of mounting grooves.

[0004] The cable is clamped by four fixed clamps on the testing platform, and then the conductor resistance of the cable can be tested by a test bridge. During the test, temperature has a great influence on conductor resistance. As the temperature rises, the conductor resistance will also increase. Therefore, the temperature needs to be controlled between 15℃ and 25℃. However, this type of cable testing device cannot control the temperature around the cable under test, which will seriously affect the accuracy of the measurement. Summary of the Invention

[0005] The purpose of this invention is to provide a conductor DC resistance testing device that facilitates the control of the temperature around the cable under test.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a conductor DC resistance testing device, comprising a long strip-shaped testing platform, a testing bridge located on one side of the testing platform, two first clamps disposed at both ends of the testing platform, and two second clamps disposed at both ends of the testing platform and located outside the first clamps. A cavity layer is formed inside the testing platform, and an S-shaped electric heating tube is disposed inside the cavity layer. Both sides of the testing platform are provided with a cover that can be closed to wrap around the testing platform. Both ends of the cover are provided with first connecting ears, and the first connecting ears are provided with connecting holes. A rotating shaft passing through the connecting holes is provided on the testing platform, and a thermometer is disposed on the inner wall of the cover.

[0007] By adopting the above technical solution, after the cable is clamped on the testing table by the first clamp and the second clamp, the wrapping covers on both sides of the testing table can be flipped. The two wrapping covers can then swing upwards around the pivot towards the side that is closer to each other. After the two wrapping covers merge, they can wrap around the outside of the testing table. At this time, the electric heating tube in the cavity layer is activated to heat the space inside the wrapping cover. At the same time, the temperature change inside the wrapping cover is monitored by a thermometer until the temperature is controlled between 15℃ and 25℃ and stabilized for a period of time. Then, the conductor resistance test of the cable can be performed. In the end, it can be ensured that the ambient temperature around the cable is always controlled between 15℃ and 25℃, which helps to improve the accuracy of the measurement.

[0008] A further feature of the present invention is that a plurality of heat-conducting holes communicating with the cavity layer are provided on the upper surface of the middle part of the detection stage.

[0009] By adopting the above technical solution, hot air inside the cavity layer can be vented out using heat-conducting holes.

[0010] A further configuration of the present invention is as follows: the first clamp includes a first slide block slidably connected to the detection table, a first connecting platform disposed on the upper side of the first slide block, two first clamping blocks respectively disposed at both ends of the first connecting platform, a first clamping head disposed on the first clamping block, and a first driving member disposed on the first connecting platform for driving the two first clamping blocks to move toward a side that is closer to or further away from each other, wherein the first clamping heads on the two first clamping blocks are staggered.

[0011] By adopting the above technical solution, when it is necessary to clamp the cable, the first driving component drives the two first clamping blocks to move toward the side that is closer to each other, and then the first clamps on the two first clamping blocks can clamp the cable; when it is necessary to release the cable, the first driving component drives the two first clamping blocks to move toward the side that is farther from each other, and then the first clamps on the two first clamping blocks can release the cable.

[0012] A further configuration of the present invention is as follows: the second clamp includes a second slide block slidably connected to the detection table, a second connecting platform disposed on the upper side of the second slide block, two second clamping blocks respectively disposed at both ends of the second connecting platform, a second clamping head disposed on the second clamping block, and a second driving member disposed on the second connecting platform for driving the two second clamping blocks to move toward a side that is closer to or farther away from each other, wherein the second clamping heads on the two second clamping blocks are staggered.

[0013] By adopting the above technical solution, when it is necessary to clamp the cable, the second driving component drives the two second clamping blocks to move toward the side that is closer to each other, and then the second clamps on the two second clamping blocks can clamp the cable; when it is necessary to release the cable, the second driving component drives the two second clamping blocks to move toward the side that is farther from each other, and then the second clamps on the two second clamping blocks can release the cable.

[0014] A further feature of the present invention is that: a first dovetail plate with a dovetail-shaped cross-section is provided on both the first connecting platform and the second connecting platform, and a first dovetail groove is provided on the lower side of both the first clamping block and the second clamping block for the first dovetail plate to pass through.

[0015] By adopting the above technical solution, the first dovetail groove on the lower side of the first clamping block and the second clamping block is used to embed the first dovetail plate on the first connecting platform and the second connecting platform, which is conducive to the stable movement of the first clamping block and the second clamping block.

[0016] A further configuration of the present invention is as follows: the first driving member includes a first fixing plate disposed in the middle of the first connecting platform, a first fixing hole opened at the center of the first fixing plate, a first bidirectional lead screw passing through the first fixing hole, a first limiting ring disposed on the first bidirectional lead screw and located at both ends of the first fixing hole, a first threaded hole opened on two first clamping blocks and for threaded connection of the first bidirectional lead screw, and a first handle disposed at one end of the first bidirectional lead screw.

[0017] By adopting the above technical solution, the first handle drives the first bidirectional lead screw to rotate. Since the first bidirectional lead screw passes through the first fixed hole and the first bidirectional lead screw is axially limited in the first fixed hole by the first limiting ring, the first bidirectional lead screw can be circumferentially rotated and axially fixedly connected to the first fixed plate. Therefore, as the first bidirectional lead screw rotates, and since the threads at both ends of the first bidirectional lead screw are in opposite directions, the forward and reverse rotation of the first bidirectional lead screw can drive the two first clamping blocks to move toward one side closer to or further away from each other.

[0018] A further configuration of the present invention is as follows: the second driving member includes a second fixing plate disposed in the middle of the second connecting platform, a second fixing hole opened at the center of the second fixing plate, a second bidirectional lead screw passing through the second fixing hole, a second limiting ring disposed on the second bidirectional lead screw and located at both ends of the second fixing hole, a second threaded hole opened on two second clamping blocks and for threaded connection of the second bidirectional lead screw, and a second handle disposed at one end of the second bidirectional lead screw.

[0019] By adopting the above technical solution, the second handle drives the second bidirectional lead screw to rotate. Since the second bidirectional lead screw passes through the second fixed hole, and the second bidirectional lead screw is axially limited in the second fixed hole by the second limiting ring, the second bidirectional lead screw can be circumferentially rotated and axially fixedly connected to the second fixed plate. Therefore, as the second bidirectional lead screw rotates, and since the threads at both ends of the second bidirectional lead screw are in opposite directions, the forward and reverse rotation of the second bidirectional lead screw can drive the two second clamping blocks to move toward one side closer to or further away from each other.

[0020] A further feature of the present invention is as follows: heat-conducting plates are provided at both ends of the electric heating tube; an elongated hole communicating with the cavity layer is provided on the upper surface of the detection platform and at the position of the heat-conducting plate; second connecting ears are provided on both sides of the elongated hole; a fixed shaft is provided between the two second connecting ears; a swing arm is also provided between the two second connecting ears; a swing hole is provided on the swing arm for the fixed shaft to pass through; a reset torsion spring is sleeved on the fixed shaft, one end of which is connected to the swing arm and the other end of which is connected to the second connecting ear; a melting blade is provided at one end of the swing arm for abutting against the cable sheath; a bonding plate is provided at the end of the swing arm away from the melting blade for abutting against the heat-conducting plate after swinging downward; when the reset torsion spring is in its natural state, the melting blade swings downward to a position parallel to the upper surface of the detection platform; and a linkage component is also provided on the second connecting platform for rotating the cable after rotating the second handle.

[0021] By adopting the above technical solution, when the cable is clamped using the first and second clamps, it is necessary to remove the sheath from the surface of the cable. At this time, the swing arm is rotated so that the melting blade is pressed against the outer wall of the cable sheath, and the return torsion spring undergoes elastic torsion. At the same time, the bonding plate is bonded to the heat-conducting plate at the end of the electric heating tube. The electric heating tube is then activated to perform high-power heating. Subsequently, the high heat on the heat-conducting plate is transferred to the melting blade through the bonding plate and the swing arm. Since the melting blade is pressed against the cable sheath under the elastic restoring force of the return torsion spring, and since the cable sheath is mostly made of rubber material, the melting blade can melt and cut the sheath. Furthermore, the linkage component drives the cable to rotate, and then the sheath at the end of the cable can be circumferentially cut. Finally, the cable sheath can be easily pulled off the cable, which facilitates the convenient removal of the sheath from the surface of the cable.

[0022] A further setting of the present invention is as follows: at both ends of the detection table and at the position of the second sliding seat, a chute with a "convex" cross-section is provided. At the lower surface of the second sliding seat, a sliding column passing through the upper side of the chute is provided. At the lower end of the sliding column, a positioning disk embedded in the lower side of the chute and having an outer diameter equal to the width of the lower side of the chute is provided. At the end of the detection table, a fixed seat is provided. A seat hole is provided on the fixed seat. A threaded shaft passes through the seat hole. At both ends of the seat hole on the threaded shaft, third limit rings are provided. At the end of the threaded shaft, a third handle is provided. At the four side edges of the circumference of the second sliding seat, third threaded holes are provided which are pairwise connected and for the threaded connection of the threaded shaft. The linkage assembly includes an opening groove provided on the upper side of the second fixed plate and communicating with the position of the second fixed hole, a driving gear fixed on the second bidirectional screw rod and located in the opening groove, third connecting ears provided at both ends on the upper side of the second fixed plate, two driven gears respectively rotatably connected to the two third connecting ears and meshing with the driving gear, a magnet ring fixed on the second clamping block and through which the second bidirectional screw rod passes, a fixing groove provided at the middle position of the upper end of the second clamping block, a pressing arm with one end rotatably connected in the fixing groove, a pressing iron arm provided at the end of the pressing arm far from the fixing groove and used for pressing against the upper side of the cable under the suction force of the magnet ring, an embedding groove provided on the second clamping block and located between the pressing iron arm and the magnet ring, and a shielding iron plate provided at the side of the second fixed plate and used for embedding in the embedding groove. The pressing iron arm is in a V shape with the opening downward.

[0023] By adopting the above technical solution, the second sliding seat is embedded in the chute with a "convex" cross-section by using the sliding column and the positioning disk. At this time, after the threaded shaft is taken out from the third threaded hole of the second sliding seat, the second sliding seat can be rotated to make the second bidirectional screw rod on the second sliding seat parallel to the detection table. Then, the threaded shaft is threadedly connected to the corresponding third threaded hole again, so as to position the rotated second sliding seat through the threaded shaft. Subsequently, the cable against the molten knife plate can pass through the fixing grooves on the two second clamping blocks, and the cable abuts at the position between the two driven gears. At the same time, the pressing arm in the fixing groove is rotated, so that the pressing iron arm at the end of the pressing arm abuts at the upper side position of the cable. Since the pressing iron arm is subjected to the suction force of the magnet ring below, the pressing iron arm can press downward on the cable. Through the pressing action of the pressing iron arm, the side of the cable can be pressed against the driven gear. Subsequently, the second bidirectional screw rod can be rotated by rotating the second handle. The second bidirectional screw rod can drive the driving gear in the opening groove to rotate, and the driving gear can drive the two driven gears to rotate. At this time, the rotation of the driven gears can drive the cable to rotate. After the cable rotates, the molten knife plate can melt and cut the sheath at the end of the cable. Once the circumferential cutting is complete, the second handle and the second bidirectional screw can be rotated to move the two second clamping blocks toward each other until the embedding groove on the second clamping block allows the side of the shielding iron plate to be embedded. At this point, the shielding iron plate is positioned between the clamping iron arm and the magnet ring, thus shielding the magnetic attraction of the magnet ring to the clamping iron arm through the shielding iron plate. Then, the operator can easily flip the clamping arm so that the clamping iron arm leaves the cable after the circumferential cutting is completed. After removing the threaded shaft from the third threaded hole of the second slide, the second slide can be rotated in the opposite direction to restore the second bidirectional screw on the second slide to a position perpendicular to the testing table. At this time, the cable is clamped by the first clamp of the first clamp and the second clamp of the second clamp, and the cable circumferential cut position is located between the first clamp and the second clamp. Then, by rotating the third handle, the threaded shaft is rotated, thereby driving the second clamp to move away from the first clamp. Then, the sheath of the circumferentially cut cable end can be removed by the first clamp and the second clamp, and finally, the sheath on the surface of the cable can be removed relatively easily.

[0024] A further feature of the present invention is that: vertical plates are provided at both ends of the first slide, the height of the lower surface of the first slide is higher than the height of the melting blade plate which is parallel to the upper surface of the detection table, a second dovetail plate is provided on the inner wall of the vertical plate, and a second dovetail groove with a dovetail-shaped cross-section is provided on both side walls of the detection table for the second dovetail plate to pass through, and a threaded locking hole is provided on the vertical plate to penetrate the second dovetail plate, and a locking bolt for abutting against the inner wall of the second dovetail groove is threadedly connected to the threaded locking hole.

[0025] By adopting the above technical solution, the height of the lower surface of the first slide block is higher than the height of the molten blade plate which is parallel to the upper surface of the detection table. This avoids interference between the sliding of the first slide block and the molten blade plate. The first slide block is embedded in the second dovetail groove using the second dovetail plate on the vertical plate. The first slide block can then slide stably along the detection table. After sliding to the appropriate position, the locking bolt is tightened, and the end of the locking bolt abuts against the inner wall of the second dovetail groove, thereby locking the position of the first slide block after sliding.

[0026] The beneficial effects of this invention are as follows: First, after the cable is clamped on the testing table by the first clamp and the second clamp, the wrapping covers on both sides of the testing table can be flipped. The two wrapping covers can then swing upwards around the pivot towards the side that is closer to each other. After the two wrapping covers are combined, they can wrap around the outside of the testing table. At this time, the electric heating tube in the cavity layer is activated to heat the space inside the wrapping cover. At the same time, the temperature change inside the wrapping cover is monitored by a thermometer until the temperature is controlled between 15℃ and 25℃ and stabilized for a period of time. Then, the conductor resistance test of the cable can be performed. Finally, it can be ensured that the ambient temperature around the cable is always controlled between 15℃ and 25℃, which helps to improve the accuracy of the measurement. When the first clamp needs to hold the cable, the first handle drives the first bidirectional screw to rotate, thereby driving the two first clamping blocks to move toward a side closer to each other, and then the first clamps on the two first clamping blocks can clamp the cable; when it is necessary to release the cable, the first handle drives the first bidirectional screw to rotate in the opposite direction, thereby driving the two first clamping blocks to move toward a side further apart from each other, and then the first clamps on the two first clamping blocks can release the cable. Simultaneously, when the second clamp needs to hold the cable, the second handle drives the second bidirectional screw to rotate, thereby driving the two second clamping blocks to move towards each other, and then the second clamps on the two second clamping blocks can clamp the cable; when it is necessary to release the cable, the second handle drives the second bidirectional screw to rotate in the opposite direction, thereby driving the two second clamping blocks to move towards each other, and then the second clamps on the two second clamping blocks can release the cable. When using the first and second clamps to hold the cable, the surface sheaths at both ends of the cable need to be removed first. At this time, the swing arm is rotated so that the melting blade is pressed against the outer wall of the cable sheath, and the return torsion spring is elastically torn. At the same time, the bonding plate is attached to the heat-conducting plate at the end of the electric heating tube. The electric heating tube is then activated to heat at high power. The high heat on the heat-conducting plate can then be transferred to the melting blade through the bonding plate and the swing arm. Since the melting blade is pressed against the cable sheath under the elastic restoring force of the return torsion spring, and the cable sheath is mostly made of rubber, the melting blade can melt and cut the sheath. Simultaneously, after removing the threaded shaft from the third threaded hole of the second slide, the second slide can be rotated so that the second bidirectional lead screw on the second slide is parallel to the detection table. Then, the threaded shaft is re-threaded into the corresponding third threaded hole, thereby positioning the rotated second slide through the threaded shaft. Then, the cable that is against the melting blade can pass through the fixing grooves on the two second clamping blocks, and the cable is against the position between the two driven gears. At the same time, the clamping arm in the fixing groove is rotated so that the clamping iron arm at the end of the clamping arm is against the upper side of the cable. Since the clamping iron arm is attracted by the magnetic ring below, the clamping iron arm can press down on the cable. Through the clamping action of the clamping iron arm, the side of the cable can be driven to press against the driven gear. Then, by rotating the second handle, the second bidirectional lead screw can be rotated. The second bidirectional lead screw can then rotate the drive gear in the slot, which in turn can rotate the two driven gears. The rotation of the driven gears can then rotate the cable. After the cable rotates, the melting blade can melt and circumferentially cut the sheath at the end of the cable. After the circumferential cutting is completed, by rotating the second handle and the second bidirectional lead screw, the two second clamping blocks can be moved toward each other until the embedding groove on the second clamping block allows the side of the shielding iron plate to be embedded. At this time, the shielding iron plate is located between the clamping iron arm and the magnet ring. Thus, the shielding iron plate shields the magnetic attraction of the magnet ring to the clamping iron arm. Then, the operator can easily flip the clamping arm so that the clamping iron arm is removed from the circumferentially cut cable. After removing the threaded shaft from the third threaded hole of the second slide, the second slide can be rotated in the opposite direction to restore the second bidirectional screw on the second slide to a position perpendicular to the testing table. At this time, the cable is clamped by the first clamp of the first clamp and the second clamp of the second clamp, and the cable circumferential cut position is located between the first clamp and the second clamp. Then, by rotating the third handle, the threaded shaft is rotated, thereby driving the second clamp to move away from the first clamp. Then, the sheath of the circumferentially cut cable end can be removed by the first clamp and the second clamp, and finally, the sheath on the surface of the cable can be removed relatively easily. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural plan view of the present invention; Figure 2 This is a schematic diagram of the detection station in this invention; Figure 3 This is a structural plan view of the end face of the detection stage in this invention, where the two enclosures are closed. Figure 4 This is a partial structural cross-sectional view of the detection stage located in the cavity layer of the present invention; Figure 5 This is an enlarged view of the structure at one end of the detection stage in this invention; Figure 6 This is a cross-sectional view of the structure of the first clamp in this invention; Figure 7 This is a cross-sectional view of the connection relationship between the detection platform and the second clamp in this invention. At this time, the clamping iron arm is pressed down onto the cable by the attraction of the magnet ring below. Figure 8 This is a partial cross-sectional view of the connection relationship between the second connecting platform, the second clamping block and the linkage assembly in this invention. At this time, the two second clamping blocks move toward the side that is closer to each other, and the side of the shielding iron plate is embedded in the embedding groove. The shielding iron plate can be located between the pressing iron arm and the magnet ring, so that the magnetic attraction force of the magnet ring on the pressing iron arm is shielded by the shielding iron plate. The cable is indicated by dashed lines. Figure 9 This is a partial structural cross-sectional view of the detection platform located at the fixed base position in this invention; Figure 10 yes Figure 5 Enlarged view of section A; Figure 11 This is a cross-sectional view of the detection platform in this invention located at the position of the elongated hole. At this time, the melting blade is pressed against the outer wall of the cable sheath under the elastic restoring force of the reset torsion spring, and the cable is represented by a dashed line. Figure 12 This is a plan view of the connection relationship between the driving gear, driven gear, clamping arm, and clamping iron arm in this invention, with the cable represented by a dashed line; Figure 13 This is an enlarged view of the connection relationship between the second clamping block, the magnet ring, the clamping arm, and the clamping iron arm in this invention; Figure 14 This is a top view of one end of the testing platform of the present invention. At this time, the second bidirectional lead screw is parallel to the testing platform, the melting blade is pressed against the cable, the cable is in contact with the position between the two driven gears, and at the same time, the clamping iron arm is pressed down against the cable by the attraction of the magnet ring below.

[0029] In the diagram, 1. Testing platform; 11. Cavity layer; 12. Electric heating tube; 121. Heat-conducting plate; 13. Rotating shaft; 14. Heat-conducting hole; 15. Elongated hole; 16. Second connecting lug; 161. Fixed shaft; 162. Return torsion spring; 17. Slide groove; 18. Fixed seat; 181. Seat hole; 19. Threaded shaft; 191. Third limiting ring; 192. Third handle; 101. Second dovetail groove; 2. Testing bridge; 3. First 4. Second fixture; 31. First slide; 311. Vertical plate; 312. Second dovetail plate; 313. Threaded locking hole; 314. Locking bolt; 32. First connecting platform; 33. First clamping block; 34. First chuck; 35. First driving component; 351. First fixing plate; 352. First fixing hole; 353. First double-acting screw; 354. First limiting ring; 355. First threaded hole; 356. First handle; 4. Second fixture; 41. Second slide; 411. Sliding column; 412. Positioning plate; 413. Third threaded hole; 42. Second connecting platform; 43. Second clamping block; 44. Second chuck; 45. Second driving component; 451. Second fixing plate; 452. Second fixing hole; 453. Second double-acting screw; 454. Second limiting ring; 455. Second threaded hole; 456. Second handle; 5. Cover; 51. First connecting plate; 52. Ear; 53. Connecting hole; 64. Thermometer; 7. First dovetail plate; 8. First dovetail groove; 9. Swing arm; 10. Swing hole; 11. Melting blade; 12. Adhesive plate; 13. Linkage assembly; 14. Opening groove; 15. Drive gear; 16. Third connecting ear; 17. Driven gear; 18. Magnet ring; 19. Fixing groove; 20. Pressing arm; 21. Pressing iron arm; 32. Embedding groove; 43. Shielding iron plate. Detailed Implementation

[0030] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] A conductor DC resistance testing device, with reference to Figure 1 , Figure 2 , Figure 3 , Figure 4The conductor DC resistance testing device includes a long strip-shaped testing platform 1, a testing bridge 2 located on one side of the testing platform 1, two first clamps 3, and two second clamps 4. The two first clamps 3 are located at both ends of the testing platform 1, while the two second clamps 4 are located at both ends of the testing platform 1 and outside the first clamps 3. A cavity layer 11 is formed inside the testing platform 1, and an S-shaped electric heating tube 12 is bolted into the cavity layer 11. The electric heating tube 12 can provide high-power output for high heat or low-power output. After output, it is used to provide low heat. Both sides of the test platform 1 are provided with a cover 5 that can be closed to wrap around the test platform 1. The cover 5 is made of transparent plastic material. Both ends of the cover 5 are integrally provided with a first connecting ear 51. The first connecting ear 51 is provided with a connecting hole 52. The test platform 1 is welded with a rotating shaft 13 that passes through the connecting hole 52. The inner wall of the cover 5 is also equipped with a thermometer 53 for detecting the temperature inside. At the same time, multiple heat conduction holes 14 communicating with the cavity layer 11 are provided on the upper surface of the middle part of the test platform 1.

[0032] Reference Figure 2 , Figure 5 The first clamp 3 includes a first slide 31, a first connecting platform 32, a first clamping block 33, a first chuck 34, and a first driving member 35. The first slide 31 is slidably connected to the testing table 1. Vertical plates 311 are integrally provided at both ends of the first slide 31, and a second dovetail plate 312 is integrally provided on the inner wall of the vertical plate 311. At the same time, a second dovetail groove 101 with a dovetail-shaped cross-section is provided on both side walls of the testing table 1 for the second dovetail plate 312 to pass through. A through-hole is provided on the vertical plate 311. The second dovetail plate 312 has a threaded locking hole 313, on which a locking bolt 314 is threadedly connected for abutting against the inner wall of the second dovetail groove 101; meanwhile, the first connecting platform 32 is welded to the upper side of the first slide 31, and two first clamping blocks 33 are provided on the first connecting platform 32 and are respectively located at both ends of the first connecting platform 32, wherein the first chuck 34 is integrally set on the second clamping block 43, and the first chucks 34 on the two first clamping blocks 33 are staggered.

[0033] Reference Figure 5 , Figure 6The first driving component 35 is disposed on the first connecting platform 32 and is used to drive the two first clamping blocks 33 to move toward each other or away from each other. The first driving component 35 includes a first fixing plate 351, a first fixing hole 352, a first bidirectional lead screw 353, a first limiting ring 354, a first threaded hole 355, and a first handle 356. The first fixing plate 351 is integrally disposed in the middle of the first connecting platform 32, and the first fixing hole 352 is opened in the center of the first fixing plate 351. The first bidirectional lead screw 353 passes through the first fixing hole 352. The first limiting ring 354 is welded to the first bidirectional lead screw 353 and is located at both ends of the first fixing hole 352. The outer diameter of the first limiting ring 354 is larger than the inner diameter of the first fixing hole 352. The first threaded hole 355 is opened on the two first clamping blocks 33 and is used for threaded connection of the first bidirectional lead screw 353. The first handle 356 is welded to one end of the first bidirectional lead screw 353.

[0034] Reference Figure 5 , Figure 7 , Figure 9 The second clamp 4 includes a second slide 41, a second connecting platform 42, a second clamping block 43, a second chuck 44, and a second driving member 45. The second slide 41 is slidably connected to the detection platform 1. At both ends of the detection platform 1 and at the position of the second slide 41, there are convex-shaped grooves 17. A sliding post 411 is welded to the lower surface of the second slide 41, passing through the upper side of the groove 17. A positioning plate 412, with an outer diameter equal to the width of the lower side of the groove 17, is integrally provided at the lower end of the sliding post 411. A fixing seat 18 is welded to the end of the detection platform 1, and a seat hole 181 is provided on the fixing seat 18. A threaded shaft 19 passes through the seat hole 181, and a third limiting ring 191 is welded to both ends of the threaded shaft 19 at the seat hole 181. The outer diameter of the positioning ring 191 is larger than the inner diameter of the seat hole 181. Meanwhile, a third handle 192 is welded to the end of the threaded shaft 19. The four sides of the second slide 41 are provided with three threaded holes 413 that are connected in pairs and are used for threaded connection of the threaded shaft 19. The second connecting platform 42 is welded to the upper side of the second slide 41. Two second clamping blocks 43 are provided on the second connecting platform 42 and are located at both ends of the second connecting platform 42. The second chuck 44 is integrally provided on the second clamping block 43, and the second chucks 44 on the two second clamping blocks 43 are staggered. The first connecting platform 32 and the second connecting platform 42 are both integrally provided with a first dovetail plate 61 with a dovetail-shaped cross section. The lower side of the first clamping block 33 and the second clamping block 43 are provided with a first dovetail groove 62 for the first dovetail plate 61 to pass through.

[0035] Reference Figure 5 , Figure 7The second driving component 45 is disposed on the second connecting platform 42 and is used to drive the two second clamping blocks 43 to move toward each other or away from each other. The second driving component 45 includes a second fixing plate 451, a second fixing hole 452, a second bidirectional lead screw 453, a second limiting ring 454, a second threaded hole 455, and a second handle 456. The second fixing plate 451 is integrally disposed in the middle of the second connecting platform 42, and the second fixing hole 452 is opened in the center of the second fixing plate 451. The second bidirectional lead screw 453 passes through the second fixing hole 452. The second limiting ring 454 is welded to the second bidirectional lead screw 453 and is located at both ends of the second fixing hole 452. The outer diameter of the second limiting ring 454 is larger than the inner diameter of the second fixing hole 452. The second threaded hole 455 is opened on the two second clamping blocks 43 and is threadedly connected to the second bidirectional lead screw 453. The second handle 456 is welded to one end of the second bidirectional lead screw 453.

[0036] Reference Figure 4 , Figure 5 , Figure 10 and Figure 11 Both ends of the electric heating tube 12 are welded with heat-conducting plates 121. An elongated hole 15 communicating with the cavity layer 11 is formed on the upper surface of the testing platform 1 at the position of the heat-conducting plate 121, and the extension direction of the elongated hole 15 is perpendicular to the extension direction of the testing platform 1. A second connecting lug 16 is integrally formed on both sides of the elongated hole 15, and a fixed shaft 161 is welded between the two second connecting lugs 16. A swing arm 7 is also provided between the two second connecting lugs 16, and a swing hole 71 is formed on the swing arm 7 for the fixed shaft 161 to pass through. A shaft 161 is fitted with a fitting whose end is welded to the swing arm 7 and whose other end is connected to the second connecting lug. The reset torsion spring 162 is welded in 16, and a molten blade 72 is integrally provided at one end of the swing arm 7 for contacting the cable sheath. At the same time, an adhesive plate 73 is integrally provided at the end of the swing arm 7 away from the molten blade 72 for attaching to the heat-conducting plate 121 after swinging downward. When the reset torsion spring 162 is in its natural state, the molten blade 72 swings downward to a position parallel to the upper surface of the detection table 1, and at this time the height of the lower surface of the first slide 31 is higher than the height of the molten blade 72 when it is parallel to the upper surface of the detection table 1. The swing arm 7, the molten blade 72 and the adhesive plate 73 are all made of copper material, which has good thermal conductivity.

[0037] Reference Figure 7 , Figure 8 , Figure 12 and Figure 13The second connecting platform 42 is also equipped with a linkage assembly 8 for rotating the cable after rotating the second handle 456. This linkage assembly 8 includes an opening slot 81, a driving gear 82, a third connecting ear 83, a driven gear 84, a magnet ring 85, a fixing slot 86, a clamping arm 87, a clamping iron arm 88, an embedded slot 89, and a shielding iron plate 801. The opening slot 81 is located on the upper side of the second fixing plate 451 and communicates with the position of the second fixing hole 452. The driving gear 82 is welded to the second bidirectional lead screw 453 and is located in the opening slot 81. The third connecting ear 83 is integrally set at both ends on the upper side of the second fixing plate 451. There are two driven gears 84, which are rotatably connected to the two third connecting ears 83 by shafts and bearings, respectively. Simultaneously, the driven gear 84 meshes with the driving gear 82, while the magnet ring 85 is bonded and fixed to the second clamping block 43 and allows the second bidirectional lead screw 453 to pass through. The fixing groove 86 is opened at the middle position of the upper end of the second clamping block 43, and the clamping arm 87 is rotatably connected to the fixing groove 86 at one end through a shaft and bearing. At the same time, the clamping iron arm 88 is welded to the end of the clamping arm 87 away from the fixing groove 86 and is used to press it against the upper side of the cable under the attraction of the magnet ring 85. The clamping iron arm 88 is V-shaped with the opening facing downward. The embedding groove 89 is opened on the second clamping block 43 and is located between the clamping iron arm 88 and the magnet ring 85. The shielding iron plate 801 is welded to the side of the second fixing plate 451 and the side is used to embed into the embedding groove 89.

[0038] Principle: First, after the cable is clamped on the testing table 1 by the first clamp 3 and the second clamp 4, the wrapping covers 5 on both sides of the testing table 1 can be flipped. The two wrapping covers 5 can then swing upwards around the rotating shaft 13 towards the side that is closer to each other. After the two wrapping covers 5 merge, they can wrap around the outside of the testing table 1. At this time, the electric heating tube 12 in the cavity layer 11 is activated. The electric heating tube 12 heats the space inside the wrapping cover 5. At the same time, the temperature change inside the wrapping cover 5 is monitored by the thermometer 53. After the temperature is controlled between 15℃ and 25℃ and stabilized for a period of time, the conductor resistance test of the cable can be performed. In the end, it can be ensured that the ambient temperature around the cable is always controlled between 15℃ and 25℃, which helps to improve the accuracy of the measurement. When the first clamp 3 needs to clamp the cable, the first handle 356 drives the first bidirectional lead screw 353 to rotate, thereby driving the two first clamping blocks 33 to move towards each other, and then the first clamps 34 on the two first clamping blocks 33 can clamp the cable; when it is necessary to release the cable, the first handle 356 drives the first bidirectional lead screw 353 to rotate in the opposite direction, thereby driving the two first clamping blocks 33 to move towards each other, and then the first clamps 34 on the two first clamping blocks 33 can release the cable. Simultaneously, when the second clamp 4 needs to clamp the cable, the second handle 456 drives the second bidirectional lead screw 453 to rotate, thereby driving the two second clamping blocks 43 to move towards each other, and then the second clamps 44 on the two second clamping blocks 43 can clamp the cable; when it is necessary to release the cable, the second handle 456 drives the second bidirectional lead screw 453 to rotate in the opposite direction, thereby driving the two second clamping blocks 43 to move towards each other, and then the second clamps 44 on the two second clamping blocks 43 can release the cable. When clamping the cable using the first clamp 3 and the second clamp 4, the surface sheaths at both ends of the cable need to be removed first. At this time, the swing arm 7 is rotated so that the melting blade 72 is pressed against the outer wall of the cable sheath, and the return torsion spring 162 undergoes elastic torsion. Meanwhile, the bonding plate 73 is bonded to the heat-conducting plate 121 at the end of the electric heating tube 12. Since the melting blade 72 requires high heat, the electric heating tube 12 is activated to perform high-power heating. Subsequently, the high heat on the heat-conducting plate 121 can be transferred to the melting blade 72 through the bonding plate 73 and the swing arm 7. Since the melting blade 72 is pressed against the cable sheath under the elastic restoring force of the return torsion spring 162, and the cable sheath is mostly made of rubber material, the melting blade 72 can melt and cut the sheath. Simultaneously, after removing the threaded shaft 19 from the third threaded hole 413 of the second slide block 41, the second slide block 41 can be rotated so that the second bidirectional lead screw 453 on the second slide block 41 is parallel to the detection table 1. Then, the threaded shaft 19 is threaded again into the corresponding third threaded hole 413, thereby positioning the rotated second slide block 41 through the threaded shaft 19. Then, the cable that is in contact with the melting blade plate 72 can pass through the fixing groove 86 on the two second clamping blocks 43, and the cable is in contact with the position between the two driven gears 84. At the same time, the clamping arm 87 in the fixing groove 86 is rotated so that the clamping iron arm 88 at the end of the clamping arm 87 is in contact with the upper side of the cable. Since the clamping iron arm 88 is attracted by the magnetic ring 85 below, the clamping iron arm 88 can press down on the cable. Through the clamping action of the clamping iron arm 88, the side of the cable can be driven to press against the driven gear 84. Then, by rotating the second handle 456, the second bidirectional lead screw 453 can be rotated. The second bidirectional lead screw 453 can then drive the drive gear 82 in the opening slot 81 to rotate. The drive gear 82 can then drive the two driven gears 84 to rotate. At this time, the rotation of the driven gears 84 can drive the cable to rotate. After the cable rotates, the melting blade 72 can melt and circumferentially cut the sheath at the end of the cable. After the circumferential cutting is completed, by rotating the second handle 456 and the second bidirectional lead screw 453, the two second clamping blocks 43 can be moved towards each other until the embedding slot 89 on the second clamping block 43 allows the side of the shielding iron plate 801 to be embedded. At this time, the shielding iron plate 801 is located between the clamping iron arm 88 and the magnet ring 85. Thus, the shielding iron plate 801 shields the magnetic attraction of the magnet ring 85 to the clamping iron arm 88. Then, the operator can easily flip the clamping arm 87 so that the clamping iron arm 88 leaves the circumferentially cut cable. After removing the threaded shaft 19 from the third threaded hole 413 of the second slide block 41, the second slide block 41 can be rotated in the opposite direction, so that the second bidirectional lead screw 453 on the second slide block 41 returns to the position perpendicular to the test table 1. At this time, the cable is clamped by the first clamp 34 of the first clamp 3 and the second clamp 44 of the second clamp 4, and the cable circumferential cut position is located between the first clamp 3 and the second clamp 4. Then, by rotating the third handle 192, the threaded shaft 19 is driven to rotate, thereby driving the second clamp 4 to move away from the first clamp 3. Then, the sheath of the circumferential cut cable end can be removed by the first clamp 3 and the second clamp 4, and finally, the sheath on the surface of the cable can be removed relatively easily.

Claims

1. A conductor DC resistance testing device, comprising a long strip-shaped testing platform (1), a testing bridge (2) located on one side of the testing platform (1), two first clamps (3) disposed at both ends of the testing platform (1), and two second clamps (4) disposed at both ends of the testing platform (1) and located outside the first clamps (3), characterized in that: The testing platform (1) has a cavity layer (11) inside, and an S-shaped electric heating tube (12) is installed inside the cavity layer (11). Both sides of the testing platform (1) are provided with a cover (5) that can be closed to wrap around the testing platform (1). Both ends of the cover (5) are provided with a first connecting ear (51). The first connecting ear (51) is provided with a connecting hole (52). The testing platform (1) is provided with a rotating shaft (13) that passes through the connecting hole (52). A thermometer (53) is provided on the inner wall of the cover (5).

2. The conductor DC resistance testing device according to claim 1, characterized in that: The upper surface of the middle part of the testing platform (1) is provided with a number of heat-conducting holes (14) that communicate with the cavity layer (11).

3. The conductor DC resistance testing device according to claim 1, characterized in that: The first clamp (3) includes a first slide (31) slidably connected to the detection table (1), a first connecting platform (32) disposed on the upper side of the first slide (31), two first clamping blocks (33) respectively disposed at both ends of the first connecting platform (32), a first chuck (34) disposed on the first clamping block (33), and a first driving member (35) disposed on the first connecting platform (32) for driving the two first clamping blocks (33) to move toward each other or away from each other. The first chucks (34) on the two first clamping blocks (33) are staggered.

4. The conductor DC resistance testing device according to claim 3, characterized in that: The second clamp (4) includes a second slide (41) slidably connected to the detection table (1), a second connecting platform (42) disposed on the upper side of the second slide (41), two second clamping blocks (43) respectively disposed at both ends of the second connecting platform (42), a second clamp (44) disposed on the second clamping block (43), and a second driving member (45) disposed on the second connecting platform (42) for driving the two second clamping blocks (43) to move toward each other or away from each other. The second clamps (44) on the two second clamping blocks (43) are staggered.

5. The conductor DC resistance testing device according to claim 4, characterized in that: The first connecting platform (32) and the second connecting platform (42) are each provided with a first dovetail plate (61) with a dovetail-shaped cross section, and the first clamping block (33) and the second clamping block (43) are each provided with a first dovetail groove (62) for the first dovetail plate (61) to pass through.

6. The conductor DC resistance testing device according to claim 3, characterized in that: The first driving component (35) includes a first fixing plate (351) disposed in the middle of the first connecting platform (32), a first fixing hole (352) opened at the center of the first fixing plate (351), a first bidirectional lead screw (353) passing through the first fixing hole (352), a first limiting ring (354) disposed on the first bidirectional lead screw (353) and located at both ends of the first fixing hole (352), a first threaded hole (355) opened on the two first clamping blocks (33) and for threaded connection of the first bidirectional lead screw (353), and a first handle (356) disposed at one end of the first bidirectional lead screw (353).

7. The conductor DC resistance testing device according to claim 4, characterized in that: The second driving member (45) includes a second fixing plate (451) disposed in the middle of the second connecting platform (42), a second fixing hole (452) opened at the center of the second fixing plate (451), a second bidirectional lead screw (453) passing through the second fixing hole (452), a second limiting ring (454) disposed on the second bidirectional lead screw (453) and located at both ends of the second fixing hole (452), a second threaded hole (455) opened on the two second clamping blocks (43) and for threaded connection of the second bidirectional lead screw (453), and a second handle (456) disposed at one end of the second bidirectional lead screw (453).

8. The conductor DC resistance testing device according to claim 7, characterized in that: Heat-conducting plates (121) are provided at both ends of the electric heating tube (12). An elongated hole (15) communicating with the cavity layer (11) is provided on the upper surface of the detection stage (1) at the position of the heat-conducting plate (121). A second connecting ear (16) is provided on both sides of the elongated hole (15). A fixed shaft (161) is provided between the two second connecting ears (16). A swing arm (7) is also provided between the two second connecting ears (16). A swing hole (71) is provided on the swing arm (7) for the fixed shaft (161) to pass through. One end of the fixed shaft (161) is sleeved on the fixed shaft (161) and connected to the swing arm (7). A reset torsion spring (162) is connected to the second connecting ear (16) at one end and the other end is connected to the second connecting ear (16). A molten blade (72) is provided at one end of the swing arm (7) for abutting against the cable sheath. A bonding plate (73) is provided at the end of the swing arm (7) away from the molten blade (72) for attaching to the heat-conducting plate (121) after swinging downward. When the reset torsion spring (162) is in the natural state, the molten blade (72) swings downward to a position parallel to the upper surface of the detection table (1). A linkage assembly (8) is also provided on the second connecting table (42) for rotating the second handle (456) to drive the cable to rotate.

9. A conductor DC resistance testing device according to claim 8, characterized in that: At both ends of the detection table (1) and at the position of the second slide seat (41), a chute (17) with a "convex" cross-section is provided. A sliding column (411) passing through the upper side of the chute (17) is provided on the lower surface of the second slide seat (41). A positioning disk (412) with an outer diameter equal to the width of the lower side of the chute (17) and embedded in the lower side of the chute (17) is provided at the lower end of the sliding column (411). A fixing seat (18) is provided at the end of the detection table (1). A seat hole (181) is provided on the fixing seat (18). A threaded shaft (19) passes through the seat hole (181). Third limiting rings (191) are provided at both ends of the seat hole (181) on the threaded shaft (19). A third handle (192) is provided at the end of the threaded shaft (19). Third threaded holes (413) which are pairwise connected and for threaded connection with the threaded shaft (19) are provided at four side edges of the periphery of the second slide seat (41). The linkage component (8) includes an opening groove (81) provided on the upper side of the second fixing plate (451) and communicating with the position of the second fixing hole (452), a driving gear (82) fixed on the second bidirectional screw rod (453) and located in the opening groove (81), third connecting ears (83) provided at both ends on the upper side of the second fixing plate (451), two driven gears (84) respectively rotatably connected to the two third connecting ears (83) and meshing with the driving gear (82), a magnet ring (85) fixed on the second clamping block (43) and through which the second bidirectional screw rod (453) passes, a fixing groove (86) provided at the middle position of the upper end of the second clamping block (43), a pressing arm (87) with one end rotatably connected in the fixing groove (86), a pressing iron arm (88) provided at the end of the pressing arm (87) far from the fixing groove (86) and used for pressing on the upper side of the cable under the suction force of the magnet ring (85), an embedding groove (89) provided on the second clamping block (43) and located between the pressing iron arm (88) and the magnet ring (85), and a shielding iron plate (801) provided on the side of the second fixing plate (451) and used for embedding in the embedding groove (89). The pressing iron arm (88) is in a V shape with an opening downward.

10. A conductor DC resistance testing device according to claim 8, characterized in that: Vertical plates (311) are provided at both ends of the first slide seat (31). The height of the lower surface of the first slide seat (31) is higher than the height of the melting knife plate (72) in a state parallel to the upper surface of the detection table (1). Second dovetail plates (312) are provided on the inner walls of the vertical plates (311). Second dovetail grooves (101) with a dovetail cross-section and for passing the second dovetail plates (312) are provided on both side walls of the detection table (1). Threaded locking holes (313) penetrating the second dovetail plates (312) are provided on the vertical plates (311). Locking bolts (314) for abutting against the inner wall of the second dovetail groove (101) are threadedly connected to the threaded locking holes (313).

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