Device for measuring insulation strength of cable

Abstract

The invention discloses a device for measuring the insulation strength of a cable, and belongs to the technical field of cable insulation strength measurement. A device for measuring the insulation strength of a cable comprises a measuring vehicle, a measuring cylinder is fixedly connected to the measuring vehicle, and the measuring cylinder is used for placing a cable body; the cylinder cover is detachably connected to the measuring cylinder; the megger is connected with a rocking handle and is fixedly connected to the side wall of the measuring cylinder, and the megger is connected with a detection clamp; the mounting plate is fixedly connected to the barrel cover, a driving rod is rotationally connected to the mounting plate, and the driving rod is connected with the rocking handle; the rotating plate is rotationally connected to the barrel cover, a water supply cavity is formed in the rotating plate, the bottom of the rotating plate is fixedly connected with multiple groups of spray heads, and the multiple groups of spray heads communicate with the water supply cavity; according to the invention, through cooperation of the electric push rod, the slide block and the connecting rod, automatic rotation of the rocking handle is realized, the operation problems of first rotation and then clamping and first taking and then rotation stopping during single-person operation are solved, and the convenience and efficiency of measurement operation are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of cable insulation strength measurement technology, and in particular to a device for measuring cable insulation strength. Background Technology

[0002] In the field of cable production and testing, the insulation strength of cables is one of the key indicators for measuring their quality and safety. Existing short-section cables are widely used in power switchgear, internal wiring connections in distribution boxes, building power distribution systems, power supply for small electrical equipment, and power equipment maintenance and testing. They are mainly used to connect internal components of power equipment (such as circuit breakers and disconnect switches in switchgear) and different power distribution units to achieve power transmission and distribution, or to simulate actual working conditions in testing scenarios to test performance.

[0003] In existing technologies, the measurement of cable insulation strength is mostly done manually using a megohmmeter. However, there are still some shortcomings in the actual measurement process: when a single person performs the measurement, it is difficult to simultaneously crank the handle and hold the test clamp, making the operation cumbersome and prone to distortion of measurement accuracy; at the same time, the existing technology can only be used to test in a single environment, which may not be able to simulate the insulation performance of cables under different actual working conditions such as wetness and immersion, which may easily lead to insufficient accuracy of the measurement results, failing to effectively reflect the true insulation strength of the cable, and being susceptible to measurement accuracy deviations due to the influence of the external environment. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art by providing a device for measuring cable insulation strength.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for measuring cable insulation strength includes a measuring cart, on which a measuring cylinder is fixedly connected, and the measuring cylinder is used to hold the cable body.

[0007] The cap is detachably attached to the measuring cylinder;

[0008] A megohmmeter with a handle is fixedly connected to the side wall of the measuring cylinder, and a detection clip is connected to the megohmmeter;

[0009] A mounting plate is fixedly connected to the cylinder cover, and a drive rod is rotatably connected to the mounting plate. The drive rod is connected to the crank handle.

[0010] A rotating plate is rotatably connected to the cylinder cover. A water delivery chamber is provided in the rotating plate. Multiple sets of nozzles are fixedly connected to the bottom of the rotating plate, and the multiple sets of nozzles are connected to the water delivery chamber.

[0011] During measurement, the cable body is placed in the measuring cylinder, the cylinder cover is closed on the measuring cylinder, and the drive rod is inserted into the crank handle. The detection clamp is clamped on the branch line of the cable body. The drive rod drives the crank handle to rotate, and the operator reads the display data of the megohmmeter. After measurement, deionized water in the water supply chamber is sprayed onto the surface of the cable body through the nozzle. The drive rod drives the crank handle to rotate again, and the operator reads the display data of the megohmmeter again.

[0012] Preferably, a limiting slide plate is fixedly connected to the mounting plate, a slider is slidably connected to the limiting slide plate, a connecting rod is rotatably connected to the slider, a protruding plate is fixedly connected to the top of the drive rod, the protruding plate is rotatably connected to the connecting rod, an electric push rod is fixedly connected to the cylinder cover, and the drive end of the electric push rod is fixedly connected to the slider.

[0013] Furthermore, a first gear is fixedly connected to the drive rod, and a first gear ring is fixedly connected to the side wall of the rotating plate, wherein the first gear meshes with the first gear ring.

[0014] Furthermore, a rotating ring is rotatably connected to the measuring cylinder, the rotating ring being matched with the cable body, a support plate is fixedly connected to the side wall of the measuring cylinder, a drive motor is fixedly connected to the support plate, a second gear is fixedly connected to the drive end of the drive motor, and a second gear ring is fixedly connected to the rotating ring, the second gear meshing with the second gear ring.

[0015] Furthermore, symmetrically arranged sliding rods are fixedly connected in the measuring cylinder, floats are slidably connected on the sliding rods, and symmetrically arranged guide wheels are fixedly connected in the measuring cylinder. A pull rope is fixedly connected to one set of floats, and the end of the pull rope away from the float passes around the guide wheel and is fixedly connected to the other set of floats.

[0016] When the cable body is placed in the measuring box, the pull rope is in contact with the top of the cable body.

[0017] Furthermore, a counterweight is fixedly connected to the bottom of the float.

[0018] Furthermore, a limiting plate is fixedly connected to the top of the slide bar.

[0019] Furthermore, a water pump is fixedly connected to the cylinder cover, and a water pump and a water delivery pipe are distributed and connected to the water pump. A water tank is fixedly connected to the measuring vehicle. The end of the water pump away from the water pump is connected to the water tank, and the end of the water delivery pipe away from the water pump is connected to the water delivery chamber.

[0020] Furthermore, a limiting block is fixedly connected to the bottom of the drive rod, and a limiting groove is formed in the crank handle, with the limiting block matching the limiting groove.

[0021] Furthermore, the limiting groove is a cross groove.

[0022] Compared with the prior art, the present invention provides a device for measuring cable insulation strength, which has the following advantages:

[0023] 1. This invention achieves automatic rotation of the crank handle through the cooperation of an electric push rod, a slider, and a connecting rod, solving the operational problems of rotating before clamping and removing before stopping the rotation when operating alone, and effectively improving the convenience and efficiency of measurement operations.

[0024] 2. This invention can test the insulation resistance of the cable body under three different environments: dry, wet, and immersion. It fully simulates the actual working conditions of the cable, effectively reduces the influence of the external environment on the measurement accuracy, and improves the accuracy and comprehensiveness of cable insulation strength measurement.

[0025] 3. This invention drives the cable body to rotate via a drive motor, while the drive rod drives the rotating plate and nozzle to rotate, achieving all-round and uniform spraying of the cable body, ensuring the consistency of the cable body's humid environment, and further improving the reliability of the measurement results.

[0026] 4. The present invention includes a counterweight to prevent the float from tipping over and to assist it in quickly resetting, a limiting plate to prevent the float from slipping, and a cross-shaped limiting block and a limiting groove to ensure the connection stability between the drive rod and the crank handle. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a cable insulation strength measuring device proposed in this invention. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the structure of a cable insulation strength measuring device proposed in this invention. Figure 2 ;

[0029] Figure 3 This invention provides a device for measuring cable insulation strength. Figure 2 Enlarged view of section A in the middle;

[0030] Figure 4 This is a cross-sectional view of a cable insulation strength measuring device proposed in this invention. Figure 1 ;

[0031] Figure 5 This is a cross-sectional view of a cable insulation strength measuring device proposed in this invention. Figure 2 ;

[0032] Figure 6 This is a schematic diagram of the connection structure between the slide bar and the float in a cable insulation strength measuring device proposed in this invention;

[0033] Figure 7 This invention provides a device for measuring cable insulation strength. Figure 6 Enlarged view of part B in the image;

[0034] Figure 8 This invention provides a device for measuring cable insulation strength. Figure 6 Enlarged view of section C in the image;

[0035] Figure 9 This is a schematic diagram of the connection structure of the rotating plate of the cylinder cover in the cable insulation strength measuring device proposed in this invention;

[0036] Figure 10 This invention provides a device for measuring cable insulation strength. Figure 9 Enlarged view of part D in the image;

[0037] Figure 11 This is a schematic diagram of the megohmmeter in a cable insulation strength measuring device proposed in this invention.

[0038] In the diagram: 1. Measuring cylinder; 101. Measuring carriage; 1011. Water tank; 1012. Drain pipe; 102. Sliding rod; 1021. Limiting plate; 1022. Float plate; 103. Guide wheel; 104. Support plate; 2. Water pump; 201. Pumping pipe; 202. Water supply pipe; 3. Measuring meter; 301. Detection clamp; 302. Handle; 3021. Limiting groove; 4. Mounting plate; 401. Sliding block; 4011 1. Connecting rod; 402. Limiting slide plate; 5. Cylinder cover; 501. Electric push rod; 6. Protruding plate; 601. Drive rod; 6011. First gear; 6012. Limiting block; 7. Rotating plate; 701. First gear ring; 702. Water delivery chamber; 703. Nozzle; 8. Pull rope; 9. Rotating ring; 901. Second gear ring; 10. Cable body; 11. Counterweight; 12. Drive motor; 1201. Second gear. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] Example 1: Refer to Figures 1-8 A device for measuring the insulation strength of a cable includes a measuring cart 101, on which a measuring cylinder 1 is fixedly connected, and the measuring cylinder 1 is used to hold the cable body 10.

[0041] Cylinder cap 5 is detachably connected to measuring cylinder 1;

[0042] In practice, the cap 5 is engaged with the measuring cylinder 1;

[0043] A megohmmeter 3 with a handle 302 is fixedly connected to the side wall of the measuring cylinder 1, and a detection clip 301 is connected to the megohmmeter 3;

[0044] Mounting plate 4 is fixedly connected to cylinder cover 5. A drive rod 601 is rotatably connected to mounting plate 4. The drive rod 601 is connected to rocker handle 302.

[0045] A rotating plate 7 is rotatably connected to the cylinder cover 5. A water delivery chamber 702 is provided in the rotating plate 7. Multiple sets of nozzles 703 are fixedly connected to the bottom of the rotating plate 7. The multiple sets of nozzles 703 are connected to the water delivery chamber 702.

[0046] During measurement, the cable body 10 is placed in the measuring cylinder 1, the cylinder cover 5 is placed on the measuring cylinder 1, and the drive rod 601 is inserted into the crank handle 302. The detection clamp 301 is clamped on the branch line of the cable body 10. The drive rod 601 drives the crank handle 302 to rotate, and the operator reads the display data of the megohmmeter 3. After measurement, deionized water in the water supply chamber 702 is sprayed onto the surface of the cable body 10 through the nozzle 703. The drive rod 601 drives the crank handle 302 to rotate again, and the operator reads the display data of the megohmmeter 3 again.

[0047] During the actual measurement, no spray is applied to the measuring cylinder 1. At this time, the cable body 10 is in a dry state. The staff will then clamp the test clamp 301 on the corresponding branch line in turn to perform insulation resistance test and record the test data of each group of insulation resistance. After the test of each group of corresponding branch lines is completed, the data of the first test will be statistically summarized.

[0048] After the first measurement is completed, the water pump 2 will draw deionized water from the water tank 1011 and send the drawn deionized water into the water delivery chamber 702 through the water delivery pipe 202. As the amount of deionized water in the water delivery chamber 702 increases, the deionized water in the water delivery chamber 702 will be sprayed out through the nozzle 703. The sprayed deionized water will spray onto the cable body 10, thereby wetting the cable body 10.

[0049] During the second measurement, the staff clamped the test clip 301 onto the corresponding branch line in turn to perform insulation resistance tests and recorded the test data of each group of insulation resistance. After the test of each group of corresponding branch lines was completed, the data of the second test were statistically summarized.

[0050] It should be noted that when measuring insulation resistance, the electric push rod 501 drives the slider 401 to slide, which in turn drives the drive rod 601 to rotate. At this time, it is no longer necessary for the operator to manually crank the crank handle 302. On the one hand, this solves the problem that when the operator manually cranks the crank handle 302, they cannot free up their hands to operate the test clamp 301. This effectively solves the problem in the prior art that it is inconvenient for a single person to rotate the megohmmeter 3 before clamping and remove it before stopping the rotation. On the other hand, it can effectively control the number of rotations of the crank handle 302, thereby ensuring the detection accuracy of the megohmmeter 3.

[0051] Mounting plate 4 is fixedly connected to a limiting slide plate 402, a slider 401 is slidably connected in the limiting slide plate 402, a connecting rod 4011 is rotatably connected to the slider 401, a protruding plate 6 is fixedly connected to the top of the drive rod 601, the protruding plate 6 is rotatably connected to the connecting rod 4011, an electric push rod 501 is fixedly connected to the cylinder cover 5, and the drive end of the electric push rod 501 is fixedly connected to the slider 401.

[0052] A first gear 6011 is fixedly connected to the drive rod 601, and a first gear ring 701 is fixedly connected to the side wall of the rotating plate 7. The first gear 6011 meshes with the first gear ring 701.

[0053] Reference Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 10 When the slider 401 drives the convex plate 6 to rotate via the connecting rod 4011, the convex plate 6 will synchronously drive the drive rod 601 to rotate. When the drive rod 601 rotates, it will synchronously drive the first gear 6011 to rotate. The rotation of the first gear 6011 will drive the first gear ring 701 to rotate, which in turn will drive the rotating plate 7 to rotate.

[0054] A rotating ring 9 is rotatably connected to the measuring cylinder 1. The rotating ring 9 is matched with the cable body 10. A support plate 104 is fixedly connected to the side wall of the measuring cylinder 1. A drive motor 12 is fixedly connected to the support plate 104. A second gear 1201 is fixedly connected to the drive end of the drive motor 12. A second toothed ring 901 is fixedly connected to the rotating ring 9. The second gear 1201 meshes with the second toothed ring 901.

[0055] During the second measurement, the staff simultaneously started the drive motor 12, which drove the second gear 1201 to rotate. The rotation of the second gear 1201 will simultaneously drive the second gear ring 901 to rotate, which will drive the rotating ring 9 to rotate, and thus drive the cable body 10 to rotate. During the spraying process, when the cable body 10 rotates, the cable body 10 can be evenly wetted by the deionized water sprayed by the nozzle 703.

[0056] It should be noted that the connecting wire of the detection clamp 301 is a flexible wire. During the clamping process, the rotation of the cable body 10 will not affect the clamping of the detection clamp 301.

[0057] During spraying, the rotating plate 7 will synchronously drive the nozzle 703 to rotate. Through the rotation of the nozzle 703, the cable body 10 can be sprayed and moistened evenly, thereby ensuring the moistening effect of the cable body 10.

[0058] A symmetrically arranged sliding rod 102 is fixedly connected in the measuring cylinder 1. A float 1022 is slidably connected on the sliding rod 102. A symmetrically arranged guide wheel 103 is fixedly connected in the measuring cylinder 1. A pull rope 8 is fixedly connected on one set of floats 1022. The end of the pull rope 8 away from the float 1022 passes around the guide wheel 103 and is fixedly connected to the other set of floats 1022.

[0059] When the cable body 10 is placed in the measuring box 1, the pull rope 8 is attached to the top of the cable body 10.

[0060] Reference Figures 4-9 After the nozzle 703 sprays water and the megohmmeter 3 measures the insulation resistance of the cable body 10 when it is wet, deionized water is continuously added through the nozzle 703. As the amount of deionized water increases, the liquid level in the measuring cylinder 1 will rise continuously. At this time, the float 1022 will move upward under the buoyancy of the deionized water. The movement of the float 1022 will pull the pull rope 8. Since the pull rope 8 is in contact with the top of the cable body 10, the cable body 10 will be pulled down by the pull rope 8. At this time, the cable body 10 will bend and be immersed in the deionized water in the measuring cylinder 1. At this time, the staff will start the electric push rod 501 again, and the megohmmeter 3 will work again. The staff will clamp the test clamp 301 on the corresponding branch line in turn to perform insulation resistance test and record the test data of each group of insulation resistance. After the test of each group of corresponding branch lines is completed, the data of the third test will be statistically summarized.

[0061] The data from the three tests were compiled and compared to analyze the insulation resistance of each branch line under dry, humid, and immersion environments. By testing the insulation resistance of the cable body 10 under different environments, the measurement accuracy of the cable body 10 can be improved, and the problem of the external environment affecting the measurement accuracy can be reduced.

[0062] A counterweight block 11 is fixedly connected to the bottom of the float 1022.

[0063] Reference Figure 4 A drain pipe 1012 is fixedly connected to the bottom of the measuring cylinder 1. The drain pipe 1012 is used to drain the deionized water in the measuring cylinder 1.

[0064] Reference Figure 5 , Figure 6By setting a counterweight 11 at the bottom of the float 1022, it can prevent the rope 8 from pulling the float 1022 and causing the float 1022 to tip over. On the other hand, it can drive the float 1022 to slide down and reset quickly after the deionized water in the measuring cylinder 1 is discharged.

[0065] A limiting plate 1021 is fixedly connected to the top of the slide bar 102.

[0066] Reference Figure 5 , Figure 6 The limiting plate 1021 fixedly connected to the top of the slide bar 102 can prevent the float 1022 from sliding excessively and falling off the slide bar 102.

[0067] It should be noted that when the nozzle 703 sprays deionized water into the measuring cylinder 1, the height of the deionized water in the cylinder is lower than the bottom of the rotating ring 9, which can prevent the deionized water from flowing out through the connection gap between the rotating ring 9 and the measuring cylinder 1.

[0068] It should also be noted that an elastic rubber pad is fixedly connected to the inner wall of the rotating ring 9. The elastic rubber pad ensures the installation stability of the cable body 10 within the rotating ring 9.

[0069] A water pump 2 is fixedly connected to the cylinder cover 5. A water pump 201 and a water delivery pipe 202 are connected to the water pump 2. A water tank 1011 is fixedly connected to the measuring vehicle 101. The end of the water pump 201 away from the water pump 2 is connected to the water tank 1011. The end of the water delivery pipe 202 away from the water pump 2 is connected to the water delivery chamber 702.

[0070] Reference Figure 5 In practice, the water supply pipe 202 is rotatably connected to the rotating plate 7.

[0071] The bottom of the drive rod 601 is fixedly connected to a limit block 6012, and a limit groove 3021 is opened in the crank handle 302. The limit block 6012 matches the limit groove 3021.

[0072] The limiting groove 3021 is a cross groove.

[0073] Reference Figure 11 By setting the limiting groove 3021 as a cross groove and setting the limiting block 6012 as a matching cross block, the connection stability of the drive rod 601 and the rocker arm 302 can be further improved, thereby ensuring that the drive rod 601 can stably drive the rocker arm 302 to rotate.

[0074] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for measuring cable insulation strength, comprising a measuring carriage (101), characterized in that, A measuring cylinder (1) is fixedly connected to the measuring vehicle (101), and the measuring cylinder (1) is used to place the cable body (10). The cap (5) is detachably connected to the measuring cylinder (1); A megohmmeter (3) with a handle (302) is fixedly connected to the side wall of the measuring cylinder (1), and a detection clip (301) is connected to the megohmmeter (3). Mounting plate (4) is fixedly connected to cylinder cover (5). A drive rod (601) is rotatably connected to the mounting plate (4). The drive rod (601) is connected to the rocker handle (302). A rotating plate (7) is rotatably connected to the cylinder cover (5). A water delivery chamber (702) is provided in the rotating plate (7). Multiple sets of nozzles (703) are fixedly connected to the bottom of the rotating plate (7). The multiple sets of nozzles (703) are connected to the water delivery chamber (702). During measurement, the cable body (10) is placed in the measuring cylinder (1), the cylinder cover (5) is closed on the measuring cylinder (1), and the drive rod (601) is inserted into the crank handle (302). The detection clamp (301) is clamped on the branch line of the cable body (10). The drive rod (601) drives the crank handle (302) to rotate. The operator reads the display data of the megohmmeter (3). After measurement, the deionized water in the water supply chamber (702) is sprayed onto the surface of the cable body (10) through the nozzle (703). The drive rod (601) drives the crank handle (302) to rotate again. The operator reads the display data of the megohmmeter (3) again.

2. The device for measuring cable insulation strength according to claim 1, characterized in that, A limiting slide plate (402) is fixedly connected to the mounting plate (4). A slider (401) is slidably connected in the limiting slide plate (402). A connecting rod (4011) is rotatably connected to the slider (401). A protruding plate (6) is fixedly connected to the top of the drive rod (601). The protruding plate (6) is rotatably connected to the connecting rod (4011). An electric push rod (501) is fixedly connected to the cylinder cover (5). The driving end of the electric push rod (501) is fixedly connected to the slider (401).

3. The device for measuring cable insulation strength according to claim 2, characterized in that, A first gear (6011) is fixedly connected to the drive rod (601), and a first gear ring (701) is fixedly connected to the side wall of the rotating plate (7). The first gear (6011) meshes with the first gear ring (701).

4. The device for measuring cable insulation strength according to claim 1, characterized in that, A rotating ring (9) is rotatably connected to the measuring cylinder (1), and the rotating ring (9) matches the cable body (10). A support plate (104) is fixedly connected to the side wall of the measuring cylinder (1), and a drive motor (12) is fixedly connected to the support plate (104). A second gear (1201) is fixedly connected to the drive end of the drive motor (12), and a second toothed ring (901) is fixedly connected to the rotating ring (9). The second gear (1201) meshes with the second toothed ring (901).

5. The device for measuring cable insulation strength according to claim 1, characterized in that, The measuring cylinder (1) is fixedly connected with symmetrically arranged sliding rods (102), and floats (1022) are slidably connected to the sliding rods (102). The measuring cylinder (1) is fixedly connected with symmetrically arranged guide wheels (103). A pull rope (8) is fixedly connected to one set of floats (1022), and the end of the pull rope (8) away from the float (1022) passes around the guide wheel (103) and is fixedly connected to the other set of floats (1022). When the cable body (10) is placed in the measuring box (1), the pull rope (8) is in contact with the top of the cable body (10).

6. The device for measuring cable insulation strength according to claim 5, characterized in that, A counterweight (11) is fixedly connected to the bottom of the float (1022).

7. The device for measuring cable insulation strength according to claim 5, characterized in that, The top of the slide bar (102) is fixedly connected to a limiting plate (1021).

8. The device for measuring cable insulation strength according to claim 1, characterized in that, A water pump (2) is fixedly connected to the cylinder cover (5). A water pump (201) and a water delivery pipe (202) are connected to the water pump (2). A water tank (1011) is fixedly connected to the measuring vehicle (1). The end of the water pump (201) away from the water pump (2) is connected to the water tank (1011). The end of the water delivery pipe (202) away from the water pump (2) is connected to the water delivery chamber (702).

9. The device for measuring cable insulation strength according to claim 2, characterized in that, The bottom of the drive rod (601) is fixedly connected to a limiting block (6012), and a limiting groove (3021) is opened in the rocker handle (302). The limiting block (6012) matches the limiting groove (3021).

10. A device for measuring cable insulation strength according to claim 9, characterized in that, The limiting groove (3021) is a cross groove.

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