A line insulation resistance tester
By introducing an adjustment component and a slider positioning rod into the line insulation resistance tester, the problem of controlling the probe spacing was solved, improving flexibility and accuracy, adapting to various measurement scenarios, and ensuring the accuracy of measurement results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HANGZHOU SONGTAI POWER TECH CO LTD
- Filing Date
- 2025-10-27
- Publication Date
- 2026-06-02
AI Technical Summary
Existing line insulation resistance testers have difficulty controlling the distance between the test leads when measuring insulation materials or components without a fixed structure, leading to deviations in measurement results. Furthermore, the equipment lacks flexibility and storability.
A line insulation resistance tester was designed. By setting an adjustment component between the positive and negative test leads, including an adjustment rod, a synchronous gear, a scale, and a pointer, the distance between the test leads can be precisely adjusted. A slider and a positioning rod are set on the test leads to stabilize the measurement process and ensure that the test leads are parallel and symmetrical.
It improves the adaptability and accuracy of measurements, ensures the accuracy of probe spacing, reduces measurement deviation, and enhances the flexibility and stability of the equipment.
Smart Images
Figure CN121090877B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of resistance measurement technology, specifically to a line insulation resistance tester. Background Technology
[0002] A line insulation resistance tester is an electronic measuring instrument specifically designed to test the insulation performance of electrical lines and equipment. Its core function is to apply a specific high-voltage DC voltage and measure the resistance value of the insulation layer of the line or equipment through various internal sensors, thereby determining whether its insulation condition is good. It is a key tool for ensuring electrical safety in the power and electrical industries.
[0003] Currently, conventional line insulation resistance testers typically measure insulation resistance by manually controlling two probes to contact the object being tested. When measuring the insulation resistance of the inherent insulation structure of equipment (such as motors, transformers, cables, capacitors, etc.), the "insulation part" of the object being tested is fixed, and the connection point of the probes is determined by the structure of the equipment itself. In this case, the "pole spacing" is essentially the "insulation distance" designed by the equipment and does not require manual adjustment. It is only necessary to ensure that the probes are "correctly connected to both sides of the insulation interface." However, when measuring insulating materials or components without a fixed structure, such as measuring general plastic or resin sheets, 25mm or 50mm is commonly used, and the electrodes must be standard comb electrodes or flat electrodes to ensure that the spacing error is ≤±1mm. This is because the "pole spacing" directly changes the current path length and the size of the test area, thus significantly affecting the measurement results. Therefore, the pole spacing set by the standard or test requirements must be strictly followed. However, it is difficult to control and maintain the distance between the two probes during the measurement process using a purely manual method, which leads to deviations in the measurement results.
[0004] To address the aforementioned issues, existing technologies offer several solutions. For example, patent application number CN201911330215.9 provides a safety tool insulation resistance tester, comprising a handheld main unit housing, a working circuit board, a charger, and electrodes. The electrodes have a semi-encircling structure. The working circuit board's main board consists of an MCU, AD acquisition input, shaping and filtering input, resistance sampling input, relay-based sampling range switching, high-voltage connection L terminal, low-voltage connection E terminal, buzzer circuit, and LCM interface. Its control board consists of a relay-based high-voltage output switching, power switch, start / stop switch, alarm level selection, one-button power on / off circuit, step-down and power supply circuit, and charging interface circuit. Although this design precisely controls the distance between the two probes through sliding, its structure occupies a large space and is difficult to store. Furthermore, when measuring equipment where the "insulation part" of the test object is fixed, the probe installation method prevents the two probes from being separated, resulting in insufficient flexibility. Summary of the Invention
[0005] The purpose of this invention is to provide a line insulation resistance tester to solve the problem that controlling the distance between the two test leads to a large device that is difficult to store and lacks flexibility.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] An insulation resistance tester for circuits includes an insulation resistance meter body. A positive probe and a negative probe are connected to the insulation resistance meter body. Adjustment components are provided on the positive and negative probes. The adjustment components include a mounting base. Synchronous gears are rotatably connected to both sides of the mounting base, and the two synchronous gears mesh with each other. Adjustment rods are hinged to both sides of the mounting base. Two adjustment rods are fixedly connected to the two synchronous gears respectively. One of the adjustment rods is hinged to the positive probe, and a connecting block is hinged to one end of the other adjustment rod. A protrusion is fixedly connected to the connecting block. A groove is formed on the negative probe, and the protrusion is located within the groove. A scale is rotatably connected to the mounting base and fixedly connected to one of the synchronous gears. A pointer is fixedly connected to the mounting base.
[0008] The design is easy to understand. An adjustment assembly is placed between the positive and negative probes. Two adjustment rods on this assembly connect to the positive and negative probes respectively. Operators can control the distance between the probes by simply rotating the two rods. The mounting base also features a dial and a pointer. The dial rotates with the adjustment rods, and the values on the dial are derived from the law of cosines. For any triangle, given the lengths of two adjustment rods and their included angle, the square of the third side is equal to the sum of the squares of the first two sides minus twice the product of the squares of the first two sides and the cosine of their included angle. Therefore, the number the pointer points to on the dial represents the distance between the two sides at the current angle. The distance between the test leads is simple and convenient to operate. Furthermore, the design incorporates a connecting block hinged to one of the adjusting rods. The connection is achieved through a protrusion on the connecting block and a groove on the negative test lead. This allows the connecting block to detach from the negative test lead when measuring equipment with a fixed "insulation part," while the two adjusting rods can be folded and stored on the positive test lead without affecting the measurement. When controlling the distance between the two test leads, simply aligning the protrusion and groove completes the connection between the connecting block and the negative test lead. Therefore, this design is adaptable to various measurement scenarios, improving the versatility of the line insulation resistance tester.
[0009] Preferably, both the positive and negative probes are slidably connected to sliders. A spring is provided on one side of each slider. At least three sliding grooves are formed on the slider, and a positioning rod is slidably connected to each sliding groove. A spring is provided between the positioning rod and the inner wall of the sliding groove. The slider has a number of vent holes (one) equal to the number of sliding grooves, and each vent hole (one) communicates with a plurality of sliding grooves. Both the positive and negative probes have a number of vent holes (two) equal to the number of sliding grooves, and each vent hole (two) communicates with a plurality of vent holes (one). The length of each vent hole (two) is greater than that of each vent hole (one), and the length of each vent hole (two) is A. When the spring is not stretched, one side of each vent hole (one) is flush with one side of each vent hole (two). The maximum sliding distance of the slider is B, where B ≥ A. One end of one of the adjusting rods is connected to the slider on the positive probe, and a groove on the negative probe is formed on the slider.
[0010] It's easy to understand that when a worker manually controls the probes to contact the object being measured, it's difficult to maintain their stability, especially when the object's surface is irregular. This design addresses this by incorporating sliders on both the positive and negative probes. After adjusting the distance between the probes using the adjustment mechanism, the worker contacts the positive and negative probes to the object and pushes the mounting base. The mounting base, via adjusting rods on both sides, drives the sliders on both sides, pulling the springs and causing them to slide. At this point, multiple positioning rods on the sliders move with the sliders to the desired position. The probe slides along the outside of the probe and into contact with the object being measured. Multiple positioning rods slide along the sliding groove. If the surface of the object being measured is irregular, the lengths of the multiple positioning rods will be different. After the probe slides a certain distance, the first vent hole on the probe is blocked by the inner wall of the probe. At this time, the first vent hole cannot communicate with the second vent hole, resulting in the inside of the sliding groove being sealed. The multiple positioning rods cannot continue to move. At this time, the multiple positioning rods abut against the surface of the object being measured at different lengths, thereby providing a certain support for the probe. This reduces the shaking of the probe during the measurement process and improves the measurement accuracy of the line insulation resistance tester.
[0011] Preferably, both adjusting rods are slidably connected to limiting rods, and limiting arc surfaces are provided on both sides of the mounting base. The distance from the surface of the limiting arc surface to the axis of the synchronous gear in the direction towards the center of the mounting base gradually increases. One end of the limiting rod contacts the limiting arc surface, and the other end of the limiting rod is provided with a contact block. The slider is provided with a contact surface, and the contact block contacts the contact surface. A torsion spring is provided at the hinge between the adjusting rod and the slider on the positive electrode side, and a torsion spring is provided at the hinge between the adjusting rod and the connecting block on the negative electrode side.
[0012] It's easy to understand that when the two probes are adjusted and measured, the operator needs to ensure that the probes on both sides of the mounting base are in contact with the object being measured in a symmetrical and parallel manner. If the two probes are not parallel or are parallel but not symmetrical, the value displayed on the dial will not match the actual distance between the two probes, leading to deviations in measurement accuracy. Therefore, this design uses limit rods slidably connected to both adjustment rods. When the operator rotates the two adjustment rods to adjust the distance between the two probes, the two probes are parallel. During the rotation of the adjustment rods, the positive probe and the connecting block are pushed by the torsion springs on both sides to rotate towards the side of the mounting base. At this time, the contact surfaces on the positive and negative probes press against the contact blocks on the limit rods on both sides, causing the limit rods to slide along the adjustment rods and the other end of the limit rods to abut against the limit arc surface. When the adjustment rods rotate, the limit rods will rotate relative to the mounting base. At this time, due to the limit arc surface... As the distance from the surface to the axis of the synchronous gear gradually increases towards the center of the mounting base, when the angle between the two adjusting rods gradually decreases, the limiting rod is pushed by the limiting arc surface and slides along the adjusting rod. At this time, the contact blocks at one end of the limiting rods on both sides will push the positive and negative probes to rotate to both sides through the contact surface, thus keeping the two probes parallel. When the angle between the two adjusting rods gradually increases, the torsion springs on both sides will push the positive and negative probes to rotate inward and push the limiting rods, keeping one end of the limiting rod in contact with the limiting arc surface, thus keeping the two probes parallel. Therefore, no matter how the angle between the two adjusting rods is adjusted, the limiting rods on both sides will adjust the positive and negative probes respectively, keeping the two probes always parallel and symmetrical to each other. This ensures that the actual distance between the two probes is consistent with the value displayed on the dial, thereby avoiding deviations in measurement accuracy and improving the measurement accuracy of the line insulation resistance tester.
[0013] Preferably, a reinforcing plate is slidably connected to one side of the mounting base, the reinforcing plate is in contact with the adjusting rods on both sides, a screw is threadedly connected to one side of the mounting base on the reinforcing plate, a rotating plate is fixedly connected to one end of the screw on the outside of the mounting base, and one end of the screw is in contact with the reinforcing plate.
[0014] It's easy to understand that during measurement, excessive pressure applied by the operator or loosening of the synchronous gear due to prolonged use can cause changes in the angle between the two adjusting rods, leading to variations in the interpole spacing of the two probes and resulting in measurement deviations. This design addresses this by sliding a reinforcing plate on one side of the mounting base. When the operator adjusts the interpole spacing by rotating the two adjusting rods, they can then rotate a rotating plate. This rotating plate drives the screw to rotate, applying pressure to the reinforcing plate. Under this pressure, the reinforcing plate presses against the adjusting rods on both sides, locking them in place and preventing them from rotating. This prevents changes in the angle between the two adjusting rods during measurement, thus ensuring the accuracy of the measurement results.
[0015] Preferably, the positive electrode probe has a storage groove, the adjustment rod on one side of the positive electrode probe is located in the storage groove, and a fixing plate is fixedly connected to the positive electrode probe, the fixing plate being located in the gap between the adjustment rod and the first reinforcing plate.
[0016] As is easily understood, when the two adjustment rods are folded up onto the positive probe, they protrude from one side. When the distance between the probes doesn't need to be controlled during measurement, the adjustment rods on the positive probe can affect the operator's grip. Furthermore, without further fixation, the folded-up rods can pop out during measurement, inconveniencing the operator. Therefore, this design incorporates a storage slot on the positive probe. When the two adjustment rods are folded up, they retract into the slot, improving the operator's grip. After folding, the operator can rotate the rotating plate, which in turn rotates the screw. This pressure on the reinforcing plate, in turn, applies pressure to the fixing plate and the two adjustment rods, completely securing them to the positive probe. This prevents shaking during measurement and avoids inconvenience to the operator, thus improving the probe's stability.
[0017] Preferably, a second reinforcing plate is slidably connected to the mounting base. The second reinforcing plate is in contact with the limiting rods on both sides. The rotating plate is in contact with the second reinforcing plate. The limiting rods can slide not only along the length of the adjusting rod but also along both sides of the adjusting rod. A third reinforcing plate is fixedly connected to each of the two sliders. The third reinforcing plate located on the positive electrode probe side is located between the contact block and the slider. The third reinforcing plate located on the negative electrode probe side is located between the contact block and the connecting block.
[0018] As is easily understood, after the operator adjusts the distance between the two probes using the adjustment assembly, rotating the rotating plate reinforces the two adjusting rods. This prevents the adjusting rods from rotating when pressure is applied to the probes for measurement, thus avoiding affecting the detection accuracy. However, since the probes on both sides are kept parallel and symmetrical by the push of torsion springs, excessive pressure applied during testing can also cause the hinge between the probes and the adjusting rods to rotate, thus affecting the detection accuracy. This design addresses this by sliding a reinforcing plate two on the mounting base. When the operator adjusts the distance between the two probes using the adjustment assembly... After adjusting the distance between the test leads, when the rotating plate is rotated to reinforce the two adjusting rods, the rotating plate will also press the second reinforcing plate. The second reinforcing plate, under pressure, will press the limit rods on both sides. At this time, the contact block at one end of the limit rod will press the third reinforcing plate, clamping the third reinforcing plate and thus restricting the rotation of the positive and negative test leads on both sides. Therefore, this design allows the operator to fix not only the rotation of the adjusting rods but also the rotation of the two test leads when rotating the rotating plate to reinforce the distance between the two test leads after adjusting the distance between them using the adjusting component. This design improves the stability of the adjusting component.
[0019] Preferably, a control rod is slidably connected to the adjusting rod located near the positive electrode probe. One end of the control rod is fixedly connected to a locking block, and the other end is fixedly connected to a sliding switch. The locking block contacts the surface of the mounting base, and a spring is provided between one end of the control rod and the adjusting rod.
[0020] As is easily understood, after the operator rotates the two adjusting rods to adjust the distance between the two test leads to the appropriate distance, it is necessary to rotate the rotating plate on the mounting base to fix the adjusting rod and prevent it from rotating during measurement. However, when the operator releases one hand to rotate the rotating plate, the adjusting rod may still rotate due to various factors, such as the weight of the test leads or hand tremors, requiring the operator to readjust the adjusting rod. Therefore, this design uses a sliding control rod connected to the adjusting rod near the positive test lead. When the operator needs to rotate the two adjusting rods, they need to slide the sliding switch on one test lead and hold it. The control rod compresses the spring three and slides, moving the locking block on the control rod away from the mounting base. Then, the adjusting rod is rotated. When the adjustment is completed and the sliding switch is released to rotate the rotating plate, the spring three pushes the control rod to move, and the locking block on the control rod contacts the surface of the mounting base. The locking block applies pressure to the surface of the mounting base and pre-locks the adjusting rod, thus preventing the adjusting rod from rotating during the rotation of the rotating plate. This improves the stability and adjustment accuracy of the adjusting component.
[0021] Preferably, a rubber pad is fixedly connected to one end of the positioning rod located outside the sliding groove, and the rubber pad is made of a high-friction anti-slip material.
[0022] It's easy to understand that when measuring materials with inclined surfaces, the relatively smooth surface can cause the three positioning rods on the slider to lack support from protrusions or indentations. This can lead to the probes sliding along the inclined surface when pressure is applied, affecting the measurement process and potentially causing wear on the probe tips and the material. This design addresses this by fixing a rubber pad to one end of the positioning rod located outside the sliding groove. The rubber pad is made of a high-friction, anti-slip material. When the rubber pads on the three positioning rods are fully extended and in contact with the material, their high friction and anti-slip properties prevent the probes from sliding along the inclined surface when pressure is applied. Therefore, this design improves the stability of the probes during the measurement process, prevents wear on the probe tips and the material, and extends the lifespan of both the positive and negative probes.
[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0024] 1. This invention, by setting an adjustment component between the positive and negative probes, allows operators to control the distance between the two probes simply by rotating two adjustment rods. The mounting base also features a dial and pointer displaying the current probe spacing, making operation simple and convenient. Furthermore, by hinged a connecting block to one of the adjustment rods, the connecting block can be separated from the negative probe when controlling the probe spacing is not required during measurement. Therefore, this design adapts to various measurement scenarios, improving the versatility of the line insulation resistance tester.
[0025] 2. This invention features sliders on both the positive and negative probes. After adjusting the distance between the probes using the adjustment mechanism, the operator brings the positive and negative probes into contact with the object being measured and pushes the mounting base. The mounting base, via adjusting rods on both sides, drives the sliders on both sides to slide along with the springs. At this time, the three positioning rods, at different lengths, press against the surface of the object being measured, thus providing support for the probes. This reduces probe wobbling during measurement and improves the measurement accuracy of the line insulation resistance tester.
[0026] 3. This invention uses limiting rods that are slidably connected to both adjusting rods. The two limiting rods can adjust the angle of the positive and negative probes respectively. Therefore, no matter how the angle between the two adjusting rods is adjusted, the two probes always remain parallel and symmetrical to each other, ensuring that the actual distance between the two probes is consistent with the value displayed on the dial. This avoids deviations in measurement accuracy and improves the measurement accuracy of the line insulation resistance tester. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the line insulation resistance tester of the present invention;
[0028] Figure 2 This is a schematic diagram of the structure of the positive and negative probes of the present invention;
[0029] Figure 3 for Figure 2 Rear structural diagram;
[0030] Figure 4 for Figure 2 Sectional view at point AA;
[0031] Figure 5 for Figure 2 Enlarged view at point B in the middle;
[0032] Figure 6 for Figure 5 Schematic diagram of the structure after the removal of reinforcement plate 2;
[0033] Figure 7 for Figure 5 Schematic diagram of the internal structure of the mounting base;
[0034] Figure 8 for Figure 3 Enlarged view at point C;
[0035] Figure 9 for Figure 4 Enlarged view at point D;
[0036] Figure 10 for Figure 2 A sectional view;
[0037] Figure 11 for Figure 10 Enlarged view at point E in the middle;
[0038] Figure 12 for Figure 2 A schematic diagram of the structure after removing the positive and negative probes and the left slider;
[0039] Figure 13 for Figure 12 Enlarged view at point F;
[0040] Figure 14 This is a cross-sectional view of the adjusting rod.
[0041] In the diagram: 1. Insulation resistance meter body; 2. Positive probe; 3. Negative probe; 4. Rubber pad; 5. Mounting base; 6. Synchronous gear; 7. Adjusting rod; 8. Connecting block; 9. Protrusion; 10. Groove; 11. Dial; 12. Pointer; 13. Slider; 14. Spring 1; 15. Sliding groove; 16. Positioning rod; 17. Spring 2; 18. Vent hole 1; 19. Vent hole 2; 20. Limiting rod; 21. Limiting arc surface; 22. Contact block; 23. Contact surface; 24. Reinforcing plate 1; 25. Screw; 26. Rotating plate; 27. Storage groove; 28. Fixing plate; 29. Reinforcing plate 2; 30. Reinforcing plate 3; 31. Control rod; 32. Locking block; 33. Slide switch; 34. Spring 3. Detailed Implementation
[0042] This invention provides a line insulation resistance tester, the technical solution of which is as follows:
[0043] Please see Figures 1 to 14 An insulation resistance tester for circuits includes an insulation resistance tester body 1, with a positive probe 2 and a negative probe 3 connected to the body 1. Adjustment components are provided on the positive probe 2 and the negative probe 3. The adjustment components include a mounting base 5, with synchronous gears 6 rotatably connected to both sides of the mounting base 5. The two synchronous gears 6 mesh with each other. Adjustment rods 7 are hinged to both sides of the mounting base 5, and each adjustment rod 7 is fixedly connected to one of the synchronous gears 6. One of the adjustment rods 7 is hinged to the positive probe 2, and a connecting block 8 is hinged to one end of the other adjustment rod 7. A protrusion 9 is fixedly connected to the connecting block 8. A groove 10 is formed on the negative probe 3, and the protrusion 9 is located within the groove 10. A scale 11 is rotatably connected to the mounting base 5, and the scale 11 is fixedly connected to one of the synchronous gears 6. A pointer 12 is fixedly connected to the mounting base 5.
[0044] For further details, please refer to Figures 1 to 14Both the positive probe 2 and the negative probe 3 are slidably connected to a slider 13. A spring 14 is provided on one side of the slider 13. Three sliding grooves 15 are opened on the slider 13. A positioning rod 16 is slidably connected to the sliding groove 15. A spring 17 is provided between the positioning rod 16 and the inner wall of the sliding groove 15. Three vent holes 18 are opened on the slider 13, and the three vent holes 18 are respectively connected to the three sliding grooves 15. Both the positive probe 2 and the negative probe 3 are opened to three vent holes 19, and the three vent holes 19 respectively open to three channels. Vent 18 is connected, and vent 2 19 is longer than vent 18. The length of vent 2 19 is 2cm. When spring 14 is not stretched, one side of vent 18 is flush with one side of vent 2 19. The maximum sliding distance of slider 13 is 2.1cm. One end of one of the adjusting rods 7 is connected to slider 13 on positive probe 2. The groove 10 on negative probe 3 is opened on slider 13. The end of positioning rod 16 located outside sliding groove 15 is fixedly connected to rubber pad 4. Rubber pad 4 is made of high friction anti-slip material.
[0045] Please see Figures 1 to 14Both adjusting rods 7 are slidably connected to limiting rods 20. Limiting arc surfaces 21 are provided on both sides of the mounting base 5. The distance from the surface of the limiting arc surface 21 to the axis of the synchronous gear 6 gradually increases towards the center of the mounting base. One end of the limiting rod 20 contacts the limiting arc surface 21, and the other end of the limiting rod 20 is provided with a contact block 22. A contact surface 23 is provided on the slider 13, and the contact block 22 contacts the contact surface 23. A hinge is provided at the joint between the adjusting rod 7 and the slider 13 on the side of the positive electrode probe 2. A torsion spring is provided at the hinge between the adjusting rod 7 and the connecting block 8 on the side of the negative probe 3. A reinforcing plate 24 is slidably connected to one side of the mounting base 5, and the reinforcing plate 24 contacts the adjusting rods 7 on both sides. A screw 25 is threadedly connected to one side of the mounting base 5 on the reinforcing plate 24. A rotating plate 26 is fixedly connected to one end of the screw 25 on the outside of the mounting base 5, and one end of the screw 25 contacts the reinforcing plate 24. A storage groove 27 is provided on the positive probe 2. The adjusting rod 7 on one side of the positive probe 2 has a storage groove 27. The section rod 7 is located inside the storage slot 27. A fixing plate 28 is fixedly connected to the positive electrode probe 2. The fixing plate 28 is located in the gap between the adjusting rod 7 and the first reinforcing plate 24. A second reinforcing plate 29 is slidably connected to the mounting base 5. The second reinforcing plate 29 contacts the limiting rods 20 on both sides. The rotating plate 26 contacts the second reinforcing plate 29. The limiting rods 20 can slide not only along the length of the adjusting rod 7 but also along both sides of the adjusting rod 7. A third reinforcing plate 30 is fixedly connected to each of the two sliders 13. The reinforcing plate 30 located on the positive electrode probe 2 side is located between the contact block 22 and the slider 13. The reinforcing plate 30 located on the negative electrode probe 3 side is located between the contact block 22 and the connecting block 8. A control rod 31 is slidably connected to the adjusting rod 7 located near the positive electrode probe 2. One end of the control rod 31 is fixedly connected to a locking block 32, and the other end is fixedly connected to a sliding switch 33. The locking block 32 is in contact with the surface of the mounting base 5. A spring 34 is provided between one end of the control rod 31 and the adjusting rod 7.
[0046] Please see Figures 1 to 14When the operator needs to precisely control the distance between the two probes to measure an object, the two adjusting rods 7 are stored in the storage slots 27 on the positive probe 2. The operator rotates the rotating plate 26 on the mounting base 5, which drives the screw 25 to rotate. At this time, the first reinforcing plate 24 and the second reinforcing plate 29 lose the pressure of the screw 25 and the rotating plate 26, respectively, thus causing the adjusting rods 7 on both sides to lose the pressure of the first reinforcing plate 24. At the same time, the fixing plate 28 also loses the pressure of the first reinforcing plate 24. The operator then removes the adjusting rods 7 from the storage slots 27. After both adjusting rods 7 are completely removed, the groove 10 on the negative probe 3 is connected to the protrusion 9 on the connecting block 8. At this time, the positive probe 2 and the negative probe 3 on both sides of the mounting base 5 are connected. The pens 3 are symmetrical. The operator slides and holds the sliding switch 33 on one side of the pens, causing the control lever 31 to compress the spring 34 and slide. The locking block 32 on the control lever 31 moves away from the mounting base 5. The operator then rotates the two adjusting levers 7. At this time, the synchronous gear 6, fixed at one end, rotates. The two synchronous gears 6 mesh to ensure that the rotation angle of the two adjusting levers 7 remains consistent. The operator can then observe the distance between the farthest points of the two adjusting levers 7 outside the mounting base 5 by observing the scale 11 and pointer 12 on the mounting base 5. During the rotation of the adjusting levers 7, the positive pens 2 and the connecting block 8 are pushed by the torsion springs on both sides towards the side where the mounting base 5 is located. At this time, the contact surfaces 23 on the positive and negative pens 2 and 3 respectively... Pressing the contact blocks 22 on the two limiting rods 20 causes the limiting rods 20 to slide along the adjusting rod 7, and the other end of the limiting rods 20 to abut against the limiting arc surface 21. When the adjusting rod 7 rotates, the limiting rods 20 will rotate relative to the mounting base 5. At this time, since the distance from the surface of the limiting arc surface 21 to the axis of the synchronous gear 6 in the direction towards the center of the mounting base 5 gradually increases, when the angle between the two adjusting rods 7 gradually decreases, the limiting rods 20 will be pushed by the limiting arc surface 21 and slide along the adjusting rod 7. At this time, the contact blocks 22 at one end of the limiting rods 20 on both sides will push the positive probe 2 and the negative probe 3 to rotate to both sides through the contact surface 23 respectively. When the angle between the two adjusting rods 7 gradually increases, the torsion springs on both sides will push the positive probe 2 and the negative probe 3 to rotate to both sides respectively. The test lead 3 rotates and pushes the limiting rod 20, keeping one end of the limiting rod 20 in contact with the limiting arc surface 21. Therefore, regardless of how the angle between the two adjusting rods 7 is adjusted, the limiting rods 20 on both sides will adjust the positive test lead 2 and the negative test lead 3 respectively, keeping the two test leads parallel to each other. When the operator rotates the two adjusting rods 7 to the appropriate distance, the sliding switch 33 is released. At this time, the spring 34 pushes the control rod 31 to move, and the locking block 32 on the control rod 31 contacts the surface of the mounting base 5. At this time, the locking block 32 applies pressure to the surface of the mounting base 5 and pre-locks the adjusting rod 7. Then, the operator rotates the rotating plate 26, which drives the screw 25 to rotate, thereby applying pressure to the first reinforcing plate 24 and the second reinforcing plate 29.When the first reinforcing plate 24 is subjected to pressure, it presses against the adjusting rods 7 on both sides, thereby locking the adjusting rods 7 and preventing them from rotating. When the second reinforcing plate 29 is subjected to pressure, it presses against the limiting rods 20 on both sides. At this time, the contact block 22 at one end of the limiting rod 20 presses against the third reinforcing plate 30, thereby restricting the rotation of the positive probe 2 and the negative probe 3 on both sides. The electrode spacing between the positive probe 2 and the negative probe 3 is adjusted. At this time, the operator puts the positive probe 2 and the negative probe 3 into contact with the object being measured and pushes the mounting base 5. The mounting base 5 drives the sliders 13 on both sides to move through the adjusting rods 7 on both sides. Spring 14 slides, and when the three positioning rods 16 on slider 13 contact the object being measured, they slide along the sliding groove 15. The operator continues to push the mounting base 5, and after slider 13 slides a certain distance, vent hole 18 is blocked, preventing it from connecting with vent hole 19. The sliding groove 15 is then sealed, and the three positioning rods 16 cannot move further. The operator then applies further pressure to the mounting base 5 and can observe the display on the insulation resistance meter body 1 to obtain the test data.
[0047] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.
Claims
1. A line insulation resistance tester, comprising an insulation resistance tester body (1), a positive electrode probe (2) and a negative electrode probe (3) connected to the insulation resistance tester body (1), characterized in that, The positive probe (2) and negative probe (3) are provided with adjustment components. The adjustment components include a mounting base (5). The mounting base (5) is rotatably connected to two synchronous gears (6). The two synchronous gears (6) mesh with each other. The mounting base (5) is hinged to two adjustment rods (7). The two adjustment rods (7) are fixedly connected to the two synchronous gears (6) respectively. One of the two adjustment rods (7) is hinged to the positive probe (2). The other adjustment rod (7) is hinged to one end of a connecting block (8). A protrusion (9) is fixedly connected to the connecting block (8). The negative probe (3) has a groove (10). The protrusion (9) is located in the groove (10). A scale (11) is rotatably connected to the mounting base (5). The scale (11) is fixedly connected to one of the synchronous gears (6). A pointer (12) is fixedly connected to the mounting base (5). Both the positive probe (2) and the negative probe (3) are slidably connected to a slider (13). A spring (14) is provided on one side of the slider (13). At least three sliding grooves (15) are provided on the slider (13). A positioning rod (16) is slidably connected to the sliding groove (15). A spring (17) is provided between the positioning rod (16) and the inner wall of the sliding groove (15). A number of ventilation holes (18) are provided on the slider (13) in the same number as the number of sliding grooves (15). The multiple ventilation holes (18) are respectively connected to the multiple sliding grooves (15). Both the positive probe (2) and the negative probe (3) are provided with There are two ventilation holes (19) with the same number as the sliding groove (15). Multiple ventilation holes (19) connect multiple ventilation holes (18). The length of ventilation hole (19) is greater than that of ventilation hole (18). The length of ventilation hole (19) is A. When the spring (14) is not stretched, one side of ventilation hole (18) is flush with one side of ventilation hole (19). The maximum sliding distance of the slider (13) is B. B ≥ A. One end of one of the adjusting rods (7) is connected to the slider (13) on the positive electrode probe (2). The groove (10) on the negative electrode probe (3) is opened on the slider (13).
2. A line insulation resistance tester according to claim 1, characterised in that, Both adjusting rods (7) are slidably connected to limiting rods (20). Limiting arc surfaces (21) are opened on both sides of the mounting base (5). The distance from the surface of the limiting arc surface (21) to the axis of the synchronous gear (6) in the direction towards the center of the mounting base (5) gradually increases. One end of the limiting rod (20) contacts the limiting arc surface (21). The other end of the limiting rod (20) is provided with a contact block (22). The slider (13) is provided with a contact surface (23). The contact block (22) contacts the contact surface (23). A torsion spring is provided at the hinge between the adjusting rod (7) on the positive electrode probe (2) side and the slider (13). A torsion spring is provided at the hinge between the adjusting rod (7) on the negative electrode probe (3) side and the connecting block (8).
3. A line insulation resistance tester according to claim 2, characterised in that, A reinforcing plate (24) is slidably connected to one side of the mounting base (5). The reinforcing plate (24) is in contact with the adjusting rods (7) on both sides. A screw (25) is threadedly connected to one side of the mounting base (5) on the reinforcing plate (24). A rotating plate (26) is fixedly connected to one end of the screw (25) on the outside of the mounting base (5). One end of the screw (25) is in contact with the reinforcing plate (24).
4. A line insulation resistance tester according to claim 3, characterised in that, The positive electrode probe (2) has a storage groove (27), and the adjustment rod (7) on one side of the positive electrode probe (2) is located in the storage groove (27). A fixing piece (28) is fixedly connected to the positive electrode probe (2), and the fixing piece (28) is located in the gap between the adjustment rod (7) and the first reinforcing piece (24).
5. A line insulation resistance tester according to claim 3, wherein The mounting base (5) is slidably connected to a second reinforcing plate (29). The second reinforcing plate (29) is in contact with the limiting rods (20) on both sides. The rotating plate (26) is in contact with the second reinforcing plate (29). The limiting rod (20) can slide not only along the length of the adjusting rod (7) but also along both sides of the adjusting rod (7). The two sliders (13) are fixedly connected to a third reinforcing plate (30). The third reinforcing plate (30) on the positive electrode probe (2) side is located between the contact block (22) and the slider (13). The third reinforcing plate (30) on the negative electrode probe (3) side is located between the contact block (22) and the connecting block (8).
6. The line insulation resistance tester of claim 1, wherein, A control rod (31) is slidably connected to the adjusting rod (7) located near the positive electrode probe (2). One end of the control rod (31) is fixedly connected to a locking block (32), and the other end is fixedly connected to a sliding switch (33). The locking block (32) is in contact with the surface of the mounting base (5). A spring (34) is provided between one end of the control rod (31) and the adjusting rod (7).
7. The line insulation resistance tester of claim 1, wherein, The positioning rod (16) is fixedly connected to a rubber pad (4) at one end outside the sliding groove (15). The rubber pad (4) is made of high friction anti-slip material.