A device and method for detecting insulation effect of cable connection

Abstract

The present invention belongs to the technical field of cable insulation detection, and in particular, is a device and method for detecting the insulation effect of a cable connection. In view of the fact that the detection device does not consider the insulation effect of the insulation covering layer at the cable connection in daily use, the following scheme is proposed, including a detection table, the lower surface of which is welded with legs near the four corners, and a detection box is fixed by bolts near one side of the upper surface of the detection table, and the bottom of the detection box is distributed and installed with insulation resistors, DC power supplies, ammeters and voltmeters near the four corners, and the detection box and the bottom of the box are welded with partitions near both ends, and the middle of the inner wall on both sides of the detection box is provided with a cable transmission hole. The present invention simulates the use scenarios of cables in daily life, eliminates the risk of leakage of the insulation covering layer at the cable connection when in use, improves the perfection of insulation detection, and increases the reliability of detection.

Description

Technical Field

[0001] The present invention relates to the technical field of cable insulation detection, and in particular to a device and method for detecting insulation effect at a cable connection. Background Art

[0002] A cable is a device for transmitting electrical energy or signals, usually consisting of several or several groups of wires. Each group of wires is insulated from each other and often twisted around a central wire. The entire outside is wrapped with a highly insulating covering. During the installation of the cable, the cable may be insufficient in length and another cable needs to be connected to increase the length, and the insulating covering needs to be re-wrapped at the connection.

[0003] When existing devices test the insulation effect of the insulating covering layer at the connection, they ignore the impact of the cable in the daily use environment, such as scratches, rain soaking, bending, etc., resulting in good insulation effect during testing, but there may be potential risks. The insulating covering layer may not completely cover the connection. In actual use, it is easy to have risks such as leakage, causing casualties and posing a safety hazard. Summary of the invention

[0004] Based on the technical problem that traditional detection devices cannot simulate the insulation effect of the insulation covering layer at the cable connection under daily use, the present invention proposes a device and method for detecting the insulation effect of the cable connection.

[0005] The present invention proposes a device for detecting the insulation effect of a cable connection, comprising a detection table, legs are welded to the lower surface of the detection table near the four corners, and a detection box is fixed to the upper surface of the detection table near one side by bolts, an insulation resistor, a DC power supply, an ammeter and a voltmeter are installed on the bottom of the detection box near the four corners, and partitions are welded to the detection box and the bottom of the box near both ends, a cable transmission hole is opened in the middle of the inner walls on both sides of the detection box, and fixing rings are fixed to the inner walls on both sides of the detection box near the circumferential edge of the cable transmission hole by bolts, and a plurality of connecting columns are evenly fixed to the adjacent sides of the two fixing rings, a conveying mechanism is installed on the side of the upper surface of the detection table away from the detection box, and the conveying mechanism includes a guide transport wheel, and a simulation mechanism is installed on the side of the upper surface of the detection table near the servo motor, and the simulation mechanism includes a humidification block.

[0006] Preferably, the conveying mechanism includes a feed block, a feed block is fixed by bolts on the side of the upper surface of the detection table away from the detection box, and feeding ports are opened on both sides of the feed block, a pair of connecting blocks 1 are welded near the top of the side of the feed block away from the detection box, and adjacent sides of the two connecting blocks 1 are opened with axial holes, the axial holes are rotatably connected with the same rotating shaft, and the circumferential outer wall of the rotating shaft is sleeved and fixed with a guide transport wheel near the middle, the bottom ends of the two connecting blocks 1 are welded with loading columns, the bottom ends of the two loading columns are screwed with limiting plates, the circumferential outer walls of the two loading columns are sleeved with connecting blocks 2 near the bottom ends, and the adjacent sides of the two connecting blocks 2 are inserted with the same fixed shaft, and the circumferential outer wall of the fixed shaft is rotatably connected with a guide transport wheel near the middle.

[0007] Preferably, the circumferential outer walls of the two loading columns are sleeved with contraction springs, and the top end of the contraction springs is connected to the bottom end of the first connecting block, and the bottom end of the contraction springs is connected to the top end of the second connecting block.

[0008] Preferably, a servo motor is fixed on the upper surface of the detection platform at a corner near the guide transport wheel, and a driving pulley is sleeved and fixed on the output shaft of the servo motor, a driven pulley is sleeved and fixed on the circumferential outer wall of the rotating shaft near one end of the servo motor, and the circumferential outer walls of the driven pulley and the driving pulley are rotatably connected by the same transmission belt.

[0009] Preferably, a piston pump is plugged and fixed on one side of the upper surface of the inspection platform near the rear end of the guide transport wheel, and a pair of connecting blocks three are fixed on the top of the piston pump, and the same traction shaft is plugged on adjacent sides of the two connecting blocks three, a rotating disk is sleeved and fixed on the end of the circumferential outer wall of the rotating shaft away from the servo motor, and a limiting column is plugged and fixed on the side of the rotating disk away from the servo motor, which is deviated from the center of the circle, and a connecting rod is rotatably connected to the circumferential outer wall of the limiting column, and the end of the connecting rod away from the limiting column is connected to the traction shaft, a water inlet pipe and a water delivery pipe are respectively plugged on the circumferential outer wall of the piston pump near both ends of the bottom, and a check valve is installed on the circumferential outer walls of the water delivery pipe and the water inlet pipe near the piston pump, and a water tank is installed on the lower surface of the inspection platform near a corner of the piston pump.

[0010] Preferably, the simulation mechanism includes a humidifying block, a humidifying block is fixed to the upper surface of the detection table on one side close to the feed block by bolts, and a U-shaped groove is provided on the side of the humidifying block close to the water pipe, an annular spray head and a block are clamped in the U-shaped groove, and spray ports are evenly arranged on the circumferential inner wall of the annular spray head, and the water pipe passes through the block and is connected to the annular spray head.

[0011] Preferably, a pair of fixed blocks are fixed by bolts on one side of the upper surface of the detection table close to the humidification block, and the same support rod is inserted into the adjacent sides of the two fixed blocks close to the bottom and the top, and a pair of semi-trapezoidal cylinders of the same shape and symmetrical to each other are sleeved on the circumferential outer walls of the two support rods, and spring sheets are fixed by bolts on the adjacent sides of the two fixed blocks, and one end of the spring sheet is close to the outer wall of the semi-trapezoidal cylinder.

[0012] Preferably, a pair of guide blocks are fixed by bolts near the middle of the upper surface of the detection platform, and two cable transmission holes are opened on adjacent sides of the guide blocks, a pair of mounting plates are fixed near both ends on adjacent sides of the two guide blocks, and folding plates are staggered and fixed on adjacent sides of the two mounting plates, mounting holes are distributed in an array on adjacent sides of the two mounting plates, and a plurality of fixing columns are welded on the side of the folding plate close to the corresponding mounting plate, and the fixing columns match the mounting holes.

[0013] Preferably, a mounting bar is fixed to the upper surface of the detection platform near the front end by bolts, and a sliding groove is opened on the upper surface of the mounting bar, and the sliding groove is slidably connected to the oscilloscope.

[0014] A method for detecting insulation effect at a cable connection comprises the following steps:

[0015] S1: Insert one end of the tested cable into the feed port of the feed block, start the servo motor, rotate the guide transport wheel at the top, and the guide transport wheel at the bottom rises and squeezes the cable under the action of the contraction spring, and the cable moves horizontally under the action of the two guide transport wheels;

[0016] S2: When the servo motor is started, the rotating disk rotates, driving the connecting rod to make the piston pump work, supplying water to the annular sprinkler head, and the annular sprinkler head sprays water to wet the horizontally moving cable to simulate a rainy day environment;

[0017] S3: When the cable moves horizontally through the cavity formed by the two semi-trapezoidal cylinders, the semi-trapezoidal cylinders wipe and filter the moisture on the cable surface to keep the insulation covering of the cable clean. Then the cable passes into the area between the two guide blocks and is bent by two folding plates to simulate the bending environment.

[0018] S4: Finally, the cable enters the test box to test the insulation layer at the cable connection. The insulation resistor is used to measure the insulation resistance, the DC power supply is used to provide the voltage source, the ammeter is used to measure the current value, the voltmeter is used to measure the voltage value, and the oscilloscope is used to display the voltage and current waveforms. The waveforms are observed and compared to determine whether the insulation effect of the connection is qualified.

[0019] The beneficial effects of the present invention are:

[0020] 1. Through the simulation mechanism, the use scenarios of cables in daily life are simulated to eliminate the risk of leakage of the insulation covering layer at the cable connection during use, improve the completeness of insulation detection, and increase the reliability of detection.

[0021] 2. By setting up guide transport wheels, the sliding friction during cable transportation is changed to rolling friction, reducing friction and making cable transportation smoother and safer.

[0022] 3. By setting multiple groups of mounting holes on the mounting plate, the relative distance of the folding plates can be adjusted more conveniently, thereby changing the bending degree of the cable, and detecting the insulation effect of the insulation layer at the cable connection after different bending degrees, so that the test results are more in line with daily use scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the front-end structure of a device for detecting insulation effect at a cable connection proposed by the present invention;

[0024] Figure 2 This is a schematic diagram of the top structure of a device for detecting insulation effect at a cable connection proposed by the present invention;

[0025] Figure 3 This is a schematic diagram of the side structure of a device for detecting insulation effect at a cable connection proposed by the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of a piston pump for a device for detecting insulation effect at a cable connection proposed by the present invention;

[0027] Figure 5 This is a structural schematic diagram of a device for detecting insulation effect at a cable connection proposed by the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of a mounting plate for a device for detecting insulation effect at a cable connection proposed by the present invention;

[0029] Figure 7 The present invention provides an oscilloscope working principle diagram for a device for detecting insulation effect at a cable connection.

[0030] In the figure: 1, test table; 2, mounting bar; 201, slide; 3, oscilloscope; 4, test box; 401, cable hole 1; 5, guide block; 501, cable hole 2; 6, mounting plate; 601, mounting hole; 7, humidification block; 8, feed block; 9, guide transport wheel; 10, outrigger; 11, fixed block; 12, servo motor; 13, water tank; 14, fixed shaft; 15, connecting block 2; 16, loading column; 17, transmission belt; 18, contraction spring; 19, connecting block 1; 20, rotating shaft; 21. Rotating disk; 22. Limiting column; 23. Connecting rod; 24. Connecting block three; 25. Traction shaft; 26. Piston pump; 27. Water inlet pipe; 28. Check valve; 29. ​​Water pipe; 30. Block; 31. Spraying port; 32. Annular spraying head; 33. Support rod; 34. Semi-trapezoidal cylinder; 35. Spring sheet; 36. Fixed column; 37. Folding plate; 38. Insulating resistor; 39. DC power supply; 40. Ammeter; 41. Voltmeter; 42. Fixed ring; 43. Connecting column; 44. Partition. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Embodiment 1:

[0033] Reference Figure 1-6 , a device for detecting insulation effect at a cable connection, comprising a detection platform 1, legs 10 are welded on the lower surface of the detection platform 1 near the four corners, and a detection box 4 is fixed by bolts on the upper surface of the detection platform 1 near one side, an insulation resistor 38, a DC power supply 39, an ammeter 40 and a voltmeter 41 are installed on the bottom of the detection box 4 near the four corners, and a partition 44 is welded on the detection box 4 and the bottom of the box near both ends, a cable transmission hole 401 is opened in the middle of the inner wall of both sides of the detection box 4, and the inner wall of both sides of the detection box 4 is near the circumference of the cable transmission hole 401 A fixing ring 42 is fixed at the edge by bolts, and a plurality of connecting columns 43 are evenly fixed on the adjacent sides of the two fixing rings 42. A conveying mechanism is installed on the side of the upper surface of the test bench 1 away from the test box 4, and the conveying mechanism includes a guide transport wheel 9. A simulation mechanism is installed on the side of the upper surface of the test bench 1 close to the servo motor 12, and the simulation mechanism includes a humidifying block 7. Through the simulation mechanism, the use scenarios of cables in daily life are simulated, the risk of leakage of the insulating covering layer at the cable connection during use is eliminated, the completeness of insulation detection is improved, and the reliability of detection is increased.

[0034] refer to Figure 3The conveying mechanism includes a feed block 8. The upper surface of the test platform 1 is fixed with the feed block 8 by bolts on the side away from the test box 4, and the two sides of the feed block 8 are provided with feed ports. A pair of connecting blocks 19 are welded near the top of the side of the feed block 8 away from the test box 4, and the adjacent sides of the two connecting blocks 19 are provided with shaft holes, and the shaft holes are rotatably connected with the same rotating shaft 20, and the outer wall of the circumference of the rotating shaft 20 is sleeved and fixed with a guide transport wheel 9 near the middle, and the two connecting blocks 19 are welded with a pair of connecting blocks 19. 9 are welded with loading columns 16 at the bottom ends, and the bottom ends of the two loading columns 16 are screwed with limiting plates. The circumferential outer walls of the two loading columns 16 are sleeved with connecting blocks 15 near the bottom ends, and the adjacent sides of the two connecting blocks 15 are plugged with the same fixed shaft 14, and the circumferential outer wall of the fixed shaft 14 is rotatably connected with a guide transport wheel 9 near the middle; by setting the guide transport wheel 9, the sliding friction during cable transportation is changed to rolling friction, the friction force is reduced, and the cable transportation is more stable and safe.

[0035] refer to Figure 3 The circumferential outer walls of the two loading columns 16 are sleeved with contraction springs 18, and the top of the contraction spring 18 is connected to the bottom end of the connecting block 19, and the bottom end of the contraction spring 18 is connected to the top of the connecting block 2 15; by setting the contraction spring 18, the two guide transport wheels 9 are brought close to each other to ensure that the guide transport wheels 9 are in contact with the cable to prevent the cable from naturally falling to the bottom.

[0036] refer to Figure 3 , Figure 4 A servo motor 12 is fixed to a corner of the upper surface of the detection platform 1 near the guide transport wheel 9, and the output shaft of the servo motor 12 is sleeved and fixed with a driving pulley, and a driven pulley is sleeved and fixed to the end of the circumferential outer wall of the rotating shaft 20 near the servo motor 12, and the circumferential outer walls of the driven pulley and the driving pulley are rotatably connected with the same transmission belt 17, a piston pump 26 is plugged and fixed to the upper surface of the detection platform 1 near the rear end of the guide transport wheel 9, and a pair of connecting blocks 3 24 are fixed to the top of the piston pump 26, and the adjacent sides of the two connecting blocks 3 24 are plugged with the same traction shaft 25, and a rotating disk 21 is sleeved and fixed to the end of the circumferential outer wall of the rotating shaft 20 away from the servo motor 12, and the rotating A limiting column 22 is inserted and fixed at a point deviating from the center of the circle on one side of the disk 21 away from the servo motor 12, and a connecting rod 23 is rotatably connected to the circumferential outer wall of the limiting column 22, and one end of the connecting rod 23 away from the limiting column 22 is connected to the traction shaft 25, and a water inlet pipe 27 and a water delivery pipe 29 are respectively inserted at both ends of the circumferential outer wall of the piston pump 26 near the bottom, and a check valve 28 is installed at one end of the circumferential outer wall of the water delivery pipe 29 and the water inlet pipe 27 near the piston pump 26, and a water tank 13 is installed at a corner of the lower surface of the detection table 1 near the piston pump 26; the servo motor 12 drives the rotating shaft 20, and the rotating shaft 20 drives the rotating disk 21, and the rotating disk 21 rotates, so that the connecting rod 23 rotates back and forth, driving the piston pump 26 to work.

[0037] refer to Figure 4 The simulation mechanism includes a humidifying block 7. The humidifying block 7 is fixed to the upper surface of the test bench 1 on one side close to the feed block 8 by bolts, and a U-shaped groove is provided on the side of the humidifying block 7 close to the water pipe 29. The U-shaped groove is clamped with an annular spray head 32 and a clamping block 30, and the circumferential inner wall of the annular spray head 32 is evenly provided with spraying ports 31. The water pipe 29 passes through the clamping block 30 and is connected to the annular spray head 32; the piston pump 26 pumps water to the annular spray head 32, and the annular spray head 32 sprays water to wet the cable, simulating the state of the cable in a rainy day environment.

[0038] refer to Figure 5 A pair of fixing blocks 11 are fixed by bolts on one side of the upper surface of the test bench 1 near the humidifying block 7, and the adjacent sides of the two fixing blocks 11 are plugged with the same support rod 33 near the bottom and the top, and the circumferential outer walls of the two support rods 33 are sleeved with a pair of semi-trapezoidal cylinders 34 of the same shape and symmetrical to each other, and the adjacent sides of the two fixing blocks 11 are fixed with spring sheets 35 by bolts, and one end of the spring sheet 35 is close to the outer wall of the semi-trapezoidal cylinder 34; the spring sheet 35 is arranged to make the two semi-trapezoidal cylinders 34 move closer to the middle, ensuring that the cable is subjected to a certain pressure when passing through the cavity formed by the two semi-trapezoidal cylinders 34, filtering and removing the water droplets remaining on the cable surface, and ensuring the safety and accuracy of the cable detection.

[0039] refer to Figure 5 A pair of guide blocks 5 are fixed by bolts near the middle of the upper surface of the testing platform 1, and a cable transmission hole 501 is opened on the adjacent side of the guide blocks 5, a pair of mounting plates 6 are fixed near the two ends on the adjacent side of the two guide blocks 5, and a folding plate 37 is staggered and fixed on the adjacent side of the two mounting plates 6, and mounting holes 601 are distributed in an array on the adjacent side of the two mounting plates 6, and a plurality of fixing columns 36 are welded on the side of the folding plate 37 close to the corresponding mounting plate 6, and the fixing columns 36 and the mounting holes 601 match each other; by arranging multiple groups of mounting holes 601 on the mounting plate 6, the relative distance of the folding plate 37 can be more conveniently adjusted, thereby changing the bending degree of the cable, and detecting the insulation effect of the insulation layer at the cable connection after different bending degrees, so that the detection result is more in line with the daily use scenario.

[0040] Embodiment 2:

[0041] A device for detecting insulation effect at a cable connection. This embodiment makes the following improvements on the basis of embodiment 1: Figure 1 , Figure 2 As shown,

[0042] A mounting bar 2 is fixed to the upper surface of the test bench 1 near the front end by bolts, and a slide groove 201 is opened on the upper surface of the mounting bar 2, and an oscilloscope 3 is slidably connected to the slide groove 201; by observing the voltage and current waveforms on the oscilloscope 3, it can be clearly observed whether the waveforms have obvious deformation or abnormality, and by comparing the measurement results with the standard value or the preset range, it can be judged more quickly whether the insulation effect of the connection is qualified.

[0043] refer to Figure 7 , a method for detecting insulation effect at a cable connection, comprising the following steps:

[0044] S1: insert one end of the tested cable into the feed port of the feed block 8, start the servo motor 12, rotate the guide transport wheel 9 at the top, and the guide transport wheel 9 at the bottom rises and squeezes the cable under the action of the contraction spring 18, and the cable moves horizontally under the action of the two guide transport wheels 9;

[0045] S2: When the servo motor 12 is started, the rotating disk 21 rotates, driving the connecting rod 23, and the piston pump 26 works to supply water to the annular spray head 32. The annular spray head 32 sprays water to wet the horizontally moving cable to simulate a rainy day environment;

[0046] S3: When the cable moves horizontally through the cavity formed by the two semi-trapezoidal cylinders 34, the semi-trapezoidal cylinders 34 wipe and filter the moisture on the cable surface, so that the insulation covering layer of the cable remains clean. Then the cable passes into the area between the two guide blocks 5 and is bent by the two folding plates 37 to simulate the bending environment.

[0047] S4: Finally, the cable enters the detection box 4 to detect the insulation layer at the cable connection. The insulation resistor 38 is used to measure the insulation resistance, the DC power supply 39 is used to provide a voltage source, the ammeter 40 is used to measure the current value, the voltmeter 41 is used to measure the voltage value, and the oscilloscope 3 is used to display the voltage and current waveforms. The waveforms are observed and compared to determine whether the insulation effect of the connection is qualified.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for detecting insulation effect at a cable connection, comprising a detection platform (1), wherein legs (10) are welded to the bottom surface of the detection platform (1) near the four corners, and a detection box (4) is fixed to the top surface of the detection platform (1) near one side by bolts, characterized in that: The bottom of the detection box (4) is provided with an insulating resistor (38), a DC power supply (39), an ammeter (40) and a voltmeter (41) distributed near the four corners, and the detection box (4) and the bottom are welded with partitions (44) near both ends. A cable transmission hole (401) is opened in the middle of the inner walls on both sides of the detection box (4), and a fixing ring (42) is fixed by bolts at the circumferential edge of the inner walls on both sides of the detection box (4) near the cable transmission hole (401), and a plurality of connecting columns (43) are evenly fixed on the adjacent sides of the two fixing rings (42). A conveying mechanism is installed on the side of the upper surface of the detection platform (1) away from the detection box (4), and the conveying mechanism includes a guide transport wheel (9). A simulation mechanism is installed on the side of the upper surface of the detection platform (1) near the servo motor (12), and the simulation mechanism includes a humidifying block (7); The conveying mechanism comprises a feed block (8), a side of the upper surface of the detection platform (1) away from the detection box (4) is fixed with the feed block (8) by bolts, and two sides of the feed block (8) are provided with feed ports that communicate with each other, a side of the feed block (8) away from the detection box (4) is welded with a pair of connecting blocks (19) near the top, and adjacent sides of the two connecting blocks (19) are provided with axial holes, the axial holes are rotatably connected with the same rotating shaft (20), and a guide transport wheel (9) is sleeved and fixed near the middle of the circumferential outer wall of the rotating shaft (20), and the bottom ends of the two connecting blocks (19) are welded with a feeding wheel. A load column (16), the bottom ends of the two loading columns (16) are screwed with a limit plate, the circumferential outer walls of the two loading columns (16) are sleeved with a connecting block 2 (15) near the bottom ends, and the adjacent sides of the two connecting blocks 2 (15) are plugged with the same fixed shaft (14), and the circumferential outer wall of the fixed shaft (14) is rotatably connected to a guide transport wheel (9) near the middle; the circumferential outer walls of the two loading columns (16) are sleeved with a contraction spring (18), and the top end of the contraction spring (18) is connected to the bottom end of the connecting block 1 (19), and the bottom end of the contraction spring (18) is connected to the top end of the connecting block 2 (15); A servo motor (12) is fixed to a corner of the upper surface of the inspection platform (1) near the guide transport wheel (9), and a driving pulley is sleeved and fixed to the output shaft of the servo motor (12), and a driven pulley is sleeved and fixed to the circumferential outer wall of the rotating shaft (20) near one end of the servo motor (12), and the circumferential outer walls of the driven pulley and the driving pulley are rotatably connected to the same transmission belt (17); a piston pump (26) is plugged and fixed to a side of the upper surface of the inspection platform (1) near the guide transport wheel (9) near the rear end, and a pair of connecting blocks (24) are fixed to the top of the piston pump (26), and the adjacent sides of the two connecting blocks (24) are plugged with the same traction shaft (25), and the circumferential outer wall of the rotating shaft (20) is connected to the upper surface of the inspection platform (1). A rotating disk (21) is sleeved and fixed at one end away from the servo motor (12), and a limiting column (22) is inserted and fixed at a point deviated from the center of the circle on one side of the rotating disk (21) away from the servo motor (12), and a connecting rod (23) is rotatably connected to the circumferential outer wall of the limiting column (22), and one end of the connecting rod (23) away from the limiting column (22) is connected to the traction shaft (25), and a water inlet pipe (27) and a water delivery pipe (29) are respectively inserted at both ends of the circumferential outer wall of the piston pump (26) near the bottom, and a check valve (28) is installed at one end of the circumferential outer wall of the water delivery pipe (29) and the water inlet pipe (27) near the piston pump (26), and a water tank (13) is installed at a corner of the lower surface of the test bench (1) near the piston pump (26); The simulation mechanism comprises a humidifying block (7), the humidifying block (7) being fixed to the upper surface of the test platform (1) on a side close to the feed block (8) by bolts, and a U-shaped groove is provided on a side of the humidifying block (7) close to the water pipe (29), the U-shaped groove is clamped with an annular spray head (32) and a clamping block (30), and the circumferential inner wall of the annular spray head (32) is evenly provided with spraying ports (31), and the water pipe (29) passes through the clamping block (30) and is connected to the annular spray head (32); A pair of fixing blocks (11) are fixed to the upper surface of the detection table (1) on one side close to the humidifying block (7) by means of bolts, and the same support rod (33) is inserted into the adjacent sides of the two fixing blocks (11) close to the bottom and the top, and a pair of semi-trapezoidal cylinders (34) of the same shape and symmetrical to each other are sleeved on the circumferential outer walls of the two support rods (33), and a spring sheet (35) is fixed to the adjacent sides of the two fixing blocks (11) by means of bolts, and one end of the spring sheet (35) is close to the outer wall of the semi-trapezoidal cylinder (34).

2. A device for detecting insulation effect at a cable connection according to claim 1, characterized in that: A pair of guide blocks (5) are fixed to the upper surface of the detection platform (1) near the middle by bolts, and two cable transmission holes (501) are opened on adjacent sides of the guide blocks (5), a pair of mounting plates (6) are fixed on adjacent sides of the two guide blocks (5) near both ends, and folding plates (37) are staggeredly fixed on adjacent sides of the two mounting plates (6), mounting holes (601) are distributed in an array on adjacent sides of the two mounting plates (6), and a plurality of fixing columns (36) are welded on the side of the folding plates (37) close to the corresponding mounting plates (6), and the fixing columns (36) and the mounting holes (601) match.

3. A device for detecting insulation effect at a cable connection according to claim 2, characterized in that: A mounting bar (2) is fixed to the upper surface of the detection platform (1) near the front end by means of bolts, and a slide groove (201) is provided on the upper surface of the mounting bar (2), and an oscilloscope (3) is slidably connected to the slide groove (201).

4. A method for detecting insulation effect at a cable connection includes a device for detecting insulation effect at a cable connection as claimed in claim 3, characterized in that: The method comprises the following steps: S1: insert one end of the cable to be tested into the feed port of the feed block (8), start the servo motor (12), rotate the guide transport wheel (9) at the top, and the guide transport wheel (9) at the bottom rises and squeezes the cable under the action of the contraction spring (18), and the cable moves horizontally under the action of the two guide transport wheels (9); S2: When the servo motor (12) is started, the rotating disk (21) rotates, driving the connecting rod (23) to operate the piston pump (26) to supply water to the annular spray head (32). The annular spray head (32) sprays water to wet the horizontally moving cable, simulating a rainy day environment; S3: When the cable moves horizontally through the cavity formed by the two semi-trapezoidal cylinders (34), the semi-trapezoidal cylinders (34) wipe and filter the moisture on the cable surface, so that the insulation covering layer of the cable remains clean. Then, the cable passes into the area between the two guide blocks (5) and is bent by two folding plates (37) to simulate a bending environment. S4: Finally, the cable enters the detection box (4) to detect the insulation layer at the cable connection. The insulation resistor (38) is used to measure the insulation resistance, the DC power supply (39) is used to provide a voltage source, the ammeter (40) is used to measure the current value, the voltmeter (41) is used to measure the voltage value, and the oscilloscope (3) is used to display the voltage and current waveforms. The waveforms are observed and compared to determine whether the insulation effect of the connection is qualified.

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