Power bus insulation performance test equipment

Abstract

The invention relates to the technical field of conductor insulation performance testing, in particular to power bus insulation performance testing equipment which comprises a base, a lifting platform is installed on the top of the base through a lifting assembly, a U-shaped frame is fixed to the top of the lifting platform, and a hand-operated megohmmeter is installed on the U-shaped frame through an installation assembly. A positioning mechanism for positioning the power bus mounting bracket is arranged on the vertical section of the right side of the U-shaped frame; and a clamping mechanism for clamping the power bus is arranged on the rear sides of the two vertical sections of the U-shaped frame. The megohmmeter, the positioning mechanism and the clamping mechanism are integrally lifted to a mounting bracket position at the top of a factory by adopting the lifting platform, a tester can complete measurement without high-altitude climbing, meanwhile, a clamping claw of the clamping mechanism is isolated from a track plate through an insulating material, and a pressing pad is isolated from a clamping plate through an insulating material; personnel are prevented from contacting live parts in the testing process, the electric shock risk is effectively eliminated, and the safety of testing personnel is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of conductor insulation performance testing, and specifically to a power busbar insulation performance testing device. Background Art

[0002] A power busbar is a copper bar or aluminum bar combined conductor used for transmitting large-current electric energy, with high conductivity and structural stability; due to its characteristics of large current-carrying capacity and small voltage loss, the power busbar can achieve long-distance transmission of large-capacity electric energy in an intelligent power grid system, and is also used as an important carrier for electric energy transmission in the electrical connections of devices such as intelligent reactors, transformers, and inductors. After a large transformer converts high-voltage electric energy into a voltage level suitable for users, the electric energy is distributed to different load areas through the power busbar.

[0003] The power busbar is fixed in the horizontal or vertical direction through a U-shaped mounting bracket. As Figure 10 shown, the mounting bracket uses a fixing frame with symmetric slots to clamp both sides of the busbar, forming a stable support angle to ensure that the busbar is laid in a straight line and maintains a safe distance. After installation, it is crucial to test the insulation performance between the power busbar and the bracket, detect whether the insulating material is damaged, and whether the installation process causes damage to the insulation layer, and avoid short-circuit faults or leakage risks caused by conductive contact, which is a necessary link to ensure the safe operation of the power system.

[0004] The actual method for testing the insulation performance of the power busbar mainly uses a megohmmeter held manually by a tester. The tester needs to hold the megohmmeter and test the power busbar. However, the position of the power busbar after installation is usually at the top of the factory, so a lifting platform is required to enable the tester to climb to a height and complete the test of the power busbar.

[0005] Although the existing testing method can quickly measure the insulation resistance value between the power busbar and the mounting bracket through manual operation, there are the following technical defects in the implementation process: (1) Safety protection defect: The testing operation requires the tester to hold the megohmmeter manually in a high-altitude state for live detection. Specifically, first, the operating position is restricted by the high-altitude operation space, and the stretching range of the tester's limbs does not match the operation requirements of the instrument, which is prone to the risk of imbalance and falling; second, the L-terminal terminal of the megohmmeter is directly exposed to the operation interface in a live state, forming a non-insulated contact interface, posing an electric shock safety hazard.

[0006] (2) Testing specification defect: The manual sampling point detection method is relatively subjective and arbitrary, resulting in insufficient accuracy of the test results. Specifically, first, when detecting different phase lines of the same power busbar, the tester's selection of sampling points on the mounting bracket has subjective randomness; second, when detecting different power busbars, the selected test points are not unique, and the test points cannot cover all effective areas of the power busbar. Summary of the Invention

[0007] To solve the above technical problems, the technical solution adopted by the present invention is: a power bus insulation performance testing device, including a base. An elevating platform is installed on the top of the base through an elevating component. A U-shaped frame is fixed on the top of the elevating platform. A hand-cranked megohmmeter is installed on the U-shaped frame through an installation component. A positioning mechanism for positioning the installation bracket of the power bus is arranged on the right vertical section of the U-shaped frame. A clamping mechanism for clamping the power bus is arranged on the rear sides of the two vertical sections of the U-shaped frame; the elevating component is used to stably adjust the height of the elevating platform; the positioning mechanism includes a guide plate fixed on the top of the right vertical section of the U-shaped frame. Two guide grooves are opened inside the guide plate. A moving component for positioning and testing the installation bracket is arranged on the two guide grooves. Through the cooperation of the two guide grooves and the moving component, the corner positions of the installation bracket are fitted and the testing positions are switched. A transmission component for driving the moving component is arranged on the moving component, the base and the U-shaped frame; the clamping mechanism includes fixing plates fixed on the rear sides of the two vertical sections of the U-shaped frame. A moving plate is connected to the fixing plates through a horizontally arranged position adjusting component. A vertical spring is connected between the top of the moving plate and a vertical installation block. A clamping component for clamping the exposed position of the power bus is arranged inside the vertical installation block.

[0008] Further, the installation component includes an installation seat fixed on the top of the horizontal section of the U-shaped frame. A hollow groove is opened inside the installation seat. A motor is installed on the top of the horizontal section of the U-shaped frame and at the position of the hollow groove through a motor sleeve. The output end of the motor is fixed with a circular plate. A plurality of circular holes are evenly circumferentially opened on the circular plate. The rocker arm of the megohmmeter is limited through the circular holes. A stabilizing structure for stabilizing the megohmmeter is arranged on the two vertical sections of the U-shaped frame.

[0009] Further, the stabilizing structure includes a bidirectional threaded rod rotatably installed on the two vertical sections of the U-shaped frame. The left end slides through the U-shaped frame and is fixed with a crank. The bidirectional threaded rod is symmetrically threaded with pressure plates on the left and right. A limiting rod for limiting the pressure plate is fixed on the side of the pressure plate close to the corresponding vertical section of the U-shaped frame. The limiting rod slides through the vertical section of the U-shaped frame at the corresponding position.

[0010] Further, the moving component includes a sliding block slidably connected to the two guide grooves through a guide rod. A U-shaped mounting plate is fixed on the top of the sliding block. Transmission push rods slidably penetrate through the front and rear symmetry of the two vertical sections of the U-shaped mounting plate. A compression spring is connected between the side of each transmission push rod and the vertical section of the U-shaped mounting plate. Clamping plates are fixed on the opposite sides of the two transmission push rods. Multiple pressing pads are fixed on the opposite sides of the two clamping plates.

[0011] Further, connecting plates are symmetrically and fixedly arranged on the front and rear sides of the guiding plate. Vertical pushing blocks, corner pushing blocks and horizontal pushing blocks are fixedly arranged on the opposite sides of the two connecting plates. The transmission push rod is pushed by the vertical pushing block, the corner pushing block and the horizontal pushing block in sequence, and the pressing of the mounting bracket and the testing at different positions are completed in cooperation with the pressing pad.

[0012] Further, the transmission assembly includes a limiting slider vertically and slidably connected to the right vertical section of the U-shaped frame. A connecting rod for driving the moving assembly to move is jointly hinged between the limiting slider and the moving assembly. An operating rod is fixedly arranged at the bottom of the limiting slider. The operating rod is foldable and its position is locked by a square block. A limiting structure for limiting the operating rod is arranged between the operating rod and the base.

[0013] Further, the limiting structure includes a vertical groove opened at the right end of the base. A sliding column is slidably connected in the vertical groove. Three positioning sleeves are vertically and evenly fixedly arranged on the side of the sliding column close to the operating rod. The positioning sleeves can cooperate with the square block to position the operating rod. A connecting structure is arranged between the front side of the sliding column and the base.

[0014] Further, the position adjusting assembly includes a plurality of wedge-shaped blocks horizontally and evenly fixedly arranged at the bottom of the fixing plate. A through groove is jointly opened on all the wedge-shaped blocks and the fixing plate. A pull rod is jointly slidably connected between the moving plate and the vertical mounting block. Yielding grooves are symmetrically opened in the front and rear of the vertical mounting block. An embedded plate is fixedly arranged on the side of the pull rod corresponding to the yielding groove. A return spring is connected between the embedded plate and the yielding groove. The pull rod is also foldable and a positioning block for cooperating with the wedge-shaped block is fixedly arranged below the wedge-shaped block.

[0015] Further, the clamping assembly includes a mounting sleeve fixedly arranged at the top of the vertical mounting block. The mounting sleeve is U-shaped and a transmission plate pushed by the pull rod is vertically slidably connected in the horizontal section thereof. A connecting spring is connected between the transmission plate and the horizontal section of the mounting sleeve. Two clamping claws are symmetrically and horizontally slidably connected to the two horizontal sections of the mounting sleeve. Trajectory plates are fixedly arranged at the bottoms of the two clamping claws. Trajectory grooves are opened on the trajectory plates. Pushing rods are fixedly arranged at the left and right ends of the transmission plate corresponding to the trajectory grooves.

[0016] Further, locking and positioning plates are symmetrically and fixedly arranged at the left and right of the top of the moving plate. A locking rod slidably penetrates through each locking and positioning plate. A horizontal spring is connected between the locking rod and the locking and positioning plate. Locking holes are symmetrically opened in the left and right of the vertical mounting block. The locking holes are composed of a flared part and a square part. A locking protrusion is fixedly arranged on the pull rod corresponding to the square part of the locking hole.

[0017] The beneficial effects of the present invention are as follows: First, the present invention uses a lifting platform to lift the megohmmeter, positioning mechanism and clamping mechanism as a whole to the installation bracket position at the top of the factory. The tester can complete the measurement without climbing to high altitudes. At the same time, the clamping claws of the clamping mechanism and the track plate, as well as the pressure pad and the clamping plate, are isolated by insulating materials, and the linkage design of the locking rod and the pull rod ensures stable contact after clamping, avoiding personnel contact with live components during the test, thereby effectively eliminating the risk of electric shock and ensuring the safety of the tester.

[0018] Second, the present invention uses a positioning mechanism to press against the horizontal section, corner and vertical section of the installation bracket in stages through a vertical push block, a corner push block and a horizontal push block, combined with the clamping mechanism to perform all-round clamping of the exposed ends of the live wires of multiple power busbars, so as to realize the measurement of the insulation resistance at multiple points at different positions of the same installation bracket and different busbars. At the same time, the contact points of the selected installation bracket each time are kept consistent due to the positioning effect of the positioning sleeve; at the same time, a megohmmeter with a data storage function is selected to record all test data, thereby avoiding local insulation defects being covered by the overall data and ensuring the comprehensiveness and reliability of the test results.

[0019] Third, the present invention drives the scissor structure of the lifting platform to automatically lift through the cylinder of the lifting component, combined with the transmission component to push the sliding block to move along the horizontal section and inclined section of the guide groove, so that the pressure pad of the positioning mechanism sequentially contacts the horizontal section, corner and vertical section of the installation bracket, and realizes position locking by inserting the square block into the positioning sleeve. At the same time, the clamping mechanism quickly locates the positions of the live wires of different power busbars through the wedge block and the positioning block of the position adjustment component, thereby realizing continuous testing at multiple positions, significantly reducing the manual adjustment steps, improving the test efficiency and reducing the operation complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the drawings and embodiments.

[0021] Figure 1 is the first perspective structural schematic diagram of the present invention.

[0022] Figure 2 is the second perspective structural schematic diagram of the present invention.

[0023] Figure 3 is the partial cross-sectional view of the base, lifting component and lifting platform in the present invention.

[0024] Figure 4 is the structural schematic diagram of the positioning mechanism in the present invention.

[0025] Figure 5 is the forward partial cross-sectional view of the positioning mechanism in the present invention.

[0026] Figure 6 is the structural schematic diagram of the clamping mechanism in the present invention.

[0027] Figure 7 is a front partial sectional view of the clamping mechanism in the present invention.

[0028] Figure 8 is a side partial sectional view of the clamping mechanism in the present invention.

[0029] Figure 9 is Figure 8 an enlarged view of part A in

[0030] Figure 10 is a structural schematic diagram after the installation bracket and the power bus are installed.

[0031] In the figure: 1, base; 11, lifting assembly; 2, lifting platform; 21, U-shaped frame; 22, installation assembly; 221, mounting seat; 222, motor; 223, circular plate; 224, bidirectional threaded rod; 225, pressing plate; 226, limiting rod; 23, megohmmeter; 3, positioning mechanism; 31, guide plate; 311, guide groove; 32, moving assembly; 321, guide rod; 322, sliding block; 323, U-shaped mounting plate; 324, transmission push rod; 325, clamping plate; 326, pressing pad; 327, connecting plate; 328, vertical push block; 329, corner push block; 33, transmission assembly; 331, limiting slider; 332, connecting rod; 333, operating rod; 334, sliding column; 335, positioning sleeve; 336, fixed square plate; 340, horizontal push block; 4, clamping mechanism; 41, fixing plate; 411, moving plate; 412, vertical mounting block; 42, position adjusting assembly; 421, wedge block; 422, pull rod; 423, positioning block; 43, clamping assembly; 431, mounting sleeve; 432, transmission plate; 433, clamping jaw; 434, track plate; 435, push rod; 436, locking and positioning plate; 437, locking rod; 438, locking protrusion. Specific embodiments

[0032] The embodiments of the present invention will be described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention. For those not specified in the embodiments regarding specific technologies or conditions, they shall be carried out according to the technologies or conditions described in the literature in this field or according to the product instructions.

[0033] Refer to Figures 1 - 2, A power busbar insulation performance testing device, including a base 1. On the top of the base 1, a lifting platform 2 is installed through a lifting assembly 11. A U-shaped frame 21 is fixed on the top of the lifting platform 2. A hand-cranked megohmmeter 23 is installed on the U-shaped frame 21 through an installation assembly 22. A positioning mechanism 3 for positioning the installation bracket of the power busbar is arranged on the right vertical section of the U-shaped frame 21. A clamping mechanism 4 for clamping the power busbar is arranged on the rear sides of the two vertical sections of the U-shaped frame 21.

[0034] The lifting assembly 11 is used to smoothly adjust the height of the lifting platform 2. The lifting assembly 11 mainly consists of a scissor structure between the base 1 and the lifting platform 2 and a cylinder installed on the scissor structure. By pushing the scissor structure to expand with the cylinder, the lifting platform 2 is driven to rise.

[0035] In the present invention, the positioning mechanism 3 and the clamping mechanism 4 are respectively used to clamp the installation bracket of the power busbar and the power busbar. Thus, through the connecting wire, the megohmmeter 23 quickly measures the insulation resistance between the installation bracket and the power busbar. And by means of the lifting assembly 11 to lift the positioning mechanism 3 and the clamping mechanism 4 connected to the megohmmeter 23 to the position of the installation bracket at the top of the factory for testing, it can not only prevent the testers from working at heights, but also enable the testers to stay away from the live position, thereby ensuring the safety of the testers during the testing process.

[0036] Specifically, first, place the whole testing device below the position of the power busbar and the installation bracket to be tested and pre-position the installation bracket. At this time, the rear end of the power busbar installed on the installation bracket is the exposed end. Subsequently, drive the scissor structure with the cylinder to make the lifting platform 2 move upward. After the lifting platform 2 finishes rising, at this time, the positioning mechanism 3 is located at the horizontal section of the installation bracket, and the clamping mechanism 4 is located at the exposed end of the installed power busbar. First, complete the contact with the installation bracket through the positioning mechanism 3, and control the clamping mechanism 4 to complete the contact with the exposed end of the power busbar. After both contacts are completed, shake the rocker arm of the hand-cranked megohmmeter 23 through the installation assembly 22, so that the megohmmeter 23 quickly measures the insulation resistance between the power busbar and the installation bracket at the corresponding position. After the measurement is completed, the measured data will be saved in the megohmmeter 23. Subsequently, quickly adjust the contact position with the installation bracket through the positioning mechanism 3 and complete the measurement in turn. Then, after changing the position of the clamping mechanism 4, repeat the above operation and measure the insulation resistance between the other power busbar live wire and the installation bracket. After the measurement is completed, collect the data recorded in the megohmmeter 23 and analyze the data to evaluate the insulation performance of the power busbar and the installation bracket.

[0037] It should be noted that in order to ensure that the megohmmeter 23 can record the insulation resistance between all power buses and the mounting brackets, it is necessary to select a megohmmeter 23 with data storage function, so as to accurately record the insulation resistance at different positions between all power buses and the mounting brackets, facilitate data analysis and the accuracy of results, and ensure electrical safety.

[0038] Refer to Figures 1 - 3 , the mounting assembly 22 includes a mounting seat 221 fixed on the top of the horizontal section of the U-shaped frame 21. A hollow groove is formed in the mounting seat 221. A motor 222 is installed on the top of the horizontal section of the U-shaped frame 21 and at the position of the hollow groove through a motor sleeve. A circular plate 223 is fixed to the output end of the motor 222. A plurality of circular holes are circumferentially and evenly formed in the circular plate 223. The rocker arm of the megohmmeter 23 is limited through the circular holes. A stabilizing structure for stabilizing the megohmmeter 23 is jointly arranged on the two vertical sections of the U-shaped frame 21.

[0039] The stabilizing structure includes a bidirectional threaded rod 224 rotatably installed on the two vertical sections of the U-shaped frame 21. The left end slidably penetrates through the U-shaped frame 21 and is fixed with a rocker handle. Two pressure plates 225 are symmetrically threadedly connected to the left and right on the bidirectional threaded rod 224. A limiting rod 226 for limiting the pressure plate 225 is fixed to the side of the pressure plate 225 close to the corresponding vertical section of the U-shaped frame 21. The limiting rod 226 slidably penetrates through the vertical section of the U-shaped frame 21 at the corresponding position.

[0040] The mounting assembly 22 can not only stably install the megohmmeter 23 for measurement, but also stably measure the insulation resistance between the mounting bracket and the power bus by controlling the rotation of the motor 222 in cooperation with the rocker arm of the megohmmeter 23, and stably act on the megohmmeter 23 through the stabilizing structure, so as to ensure the stability of the megohmmeter 23 during the whole measurement process, and further avoid the situation of loose wiring caused by the shaking of the megohmmeter 23 during the test.

[0041] Specifically, first select a megohmmeter 23 with a suitable voltage according to the rated voltage of the power bus to be measured. Then the tester places the selected megohmmeter 23 on the top of the mounting seat 221 and makes the rocker arm of the megohmmeter 23 penetrate through any circular hole on the circular plate 223. After the megohmmeter 23 is positioned, the tester rotates the bidirectional threaded rod 224 through the rocker handle, so as to drive the two pressure plates 225 to move synchronously through the bidirectional threaded rod 224 until the two pressure plates 225 jointly press against the left and right sides of the megohmmeter 23, thus completing the positioning and stabilization of the megohmmeter 23.

[0042] Refer to Figure 2 、 Figure 4 and Figure 5, the positioning mechanism 3 includes a guide plate 31 fixed to the top of the right vertical section of the U-shaped frame 21. Two guide grooves 311 are formed inside the guide plate 31. Each guide groove 311 consists of a horizontal section, a vertical section, and an inclined section connecting the two. A moving component 32 for positioning and testing the mounting bracket is provided on the two guide grooves 311. By means of the cooperation of the two guide grooves 311 and the moving component 32, the corner positions of the mounting bracket are fitted and the switching of the test positions is carried out. A transmission component 33 for driving the moving component 32 is provided on the moving component 32, the base 1, and the U-shaped frame 21.

[0043] The moving component 32 includes a sliding block 322 slidably connected to the two guide grooves 311 through a guide rod 321. A U-shaped mounting plate 323 is fixed to the top of the sliding block 322. Transmission push rods 324 slidably penetrate through the front and back of the two vertical sections of the U-shaped mounting plate 323 symmetrically. A compression spring is connected between the side of each transmission push rod 324 and the vertical section of the U-shaped mounting plate 323. Clamping plates 325 are fixed to the opposite sides of the two transmission push rods 324. Multiple pressing pads 326 are fixed to the opposite sides of the two clamping plates 325. The pressing pads 326 are made of conductive silicone material; A conducting wire is connected between the pressing pads 326 on the left and right sides. The conducting wire penetrates through the horizontal section of the sliding block 322 and the U-shaped mounting plate 323 and the guide plate 31 and extends to the right side position of the guide plate 31.

[0044] Connecting plates 327 are symmetrically fixed to the front and back sides of the guide plate 31. Vertical push blocks 328, corner push blocks 329, and horizontal push blocks 340 are fixed to the opposite sides of the two connecting plates 327.

[0045] The positioning mechanism 3 is used to position and fully contact the position of the mounting bracket, so as to conduct through the pressing pads 326 and complete the measurement. At the same time, by means of sequentially pushing the transmission push rods 324 by the vertical push blocks 328, corner push blocks 329, and horizontal push blocks 340, the pressing of the mounting bracket and the testing of different positions are completed in cooperation with the pressing pads 326. Furthermore, the insulation resistances of the single power busbar and the horizontal section, vertical section, and corner positions of the mounting bracket are measured, the test data is increased, and the accuracy of the test results is improved. And it can avoid the situation that the overall insulation resistance between the mounting bracket and the power busbar is large and masks the non-compliance of the insulation resistance at local positions.

[0046] Specifically, after the installation and positioning of the megohmmeter 23 are completed, first connect the conducting wire on the pressing pad 326 to the E terminal of the megohmmeter 23 through a connecting wire. After the lifting platform 2 has risen, at this time, the pressing pad 326 is located on the front and rear sides of the horizontal section of the mounting bracket and does not contact the mounting bracket. Subsequently, the transmission assembly 33 drives the sliding block 322 to move away from the megohmmeter 23 first. At this time, the sliding block 322 will move horizontally due to the limiting and guiding effect of the horizontal section of the guiding groove 311 on the guiding rod 321. When the pressing pad 326 moves horizontally to the position of the horizontal push block 340, stop the pushing action of the transmission assembly 33. At this time, the pressing pad 326 will press against the front and rear sides of the horizontal section of the mounting bracket due to the pushing action of the horizontal push block 340 on the transmission push rod 324. Subsequently, quickly test the insulation resistance between the mounting bracket and the power bus at this location through the megohmmeter 23.

[0047] After the test is completed, drive the sliding block 322 to move along the guiding groove 311 through the transmission assembly 33 again. When the sliding block 322 moves to the inclined section of the guiding groove 311, it will first rotate until the sliding block 322 is parallel to the inclined section of the guiding groove 311. Subsequently, the sliding block 322 will move along the inclined section of the guiding groove 311 under the driving action of the transmission assembly 33. During this process, when the pressing pad 326 moves horizontally to the position of the corner push block 329, stop the pushing action of the transmission assembly 33. At this time, the pressing pad 326 will press against the front and rear sides of the corner position of the mounting bracket due to the pushing action of the corner push block 329 on the transmission push rod 324. Subsequently, quickly test the insulation resistance between the mounting bracket and the power bus at this location through the megohmmeter 23. Repeat the above pushing operation again until the insulation resistance between the vertical section of the mounting bracket and the power bus is tested through the megohmmeter 23. During the process of the pressing pad 326 pressing against the mounting bracket, since the pressing pad 326 itself is made of conductive silicone material, it is ensured that the pressing pad 326 can adapt to the uneven surface of the mounting bracket, thereby ensuring the accuracy and conductive effect of the pressing.

[0048] Refer to Figures 2 - 5 , the transmission assembly 33 includes a limiting slider 331 vertically and slidably connected to the right vertical section of the U-shaped frame 21. A connecting rod 332 for driving the sliding block 322 to move is jointly hinged between the limiting slider 331 and the sliding block 322. A operating rod 333 is fixed to the bottom of the limiting slider 331. The operating rod 333 is foldable and its position is locked by a square block. A limiting structure for limiting the operating rod 333 is provided between the operating rod 333 and the base 1.

[0049] The limiting structure includes a vertical groove opened at the right end of the base 1. A sliding column 334 is slidably connected in the vertical groove. Three positioning sleeves 335 are vertically and evenly fixed on the side of the sliding column 334 close to the operating rod 333. The positioning sleeves 335 can cooperate with the square block to position the operating rod 333. A connecting structure is provided between the front side of the sliding column 334 and the base 1. The connecting structure includes a fixed square plate 336 fixed at the right end of the base 1. A plurality of positioning holes are vertically and evenly arranged on the fixed square plate 336. A coordination hole is fixed on the front side of the lowermost positioning sleeve 335. A positioning pin is commonly connected to the coordination hole and the positioning hole.

[0050] The transmission assembly 33 can not only push the sliding block 322 to cooperate with the guide groove 311 to quickly adjust the position of the pressing pad 326, so as to cooperate with the vertical push block 328, the corner push block 329 and the horizontal push block 340 to quickly switch the pressing state of the pressing pad 326, but also adjust the position of the operating rod 333 through the cooperation of the positioning sleeve 335 and the square block, so that the position of the operating rod 333 is stable, thereby ensuring that the pressing pad 326 contacts the mounting bracket stably during the test, and further ensuring the accuracy of the test data and test results.

[0051] Specifically, before the lifting platform 2 rises, first unlock the folded state of the operating rod 333 through the square block, so that the operating rod 333 can extend after the lifting platform 2 rises. At this time, the pressing pad 326 is located on the front and rear sides of the horizontal section of the mounting bracket and does not contact the mounting bracket. Subsequently, the tester pushes the operating rod 333 upward, so as to drive the limiting slider 331 to move upward through the operating rod 333. The limiting slider 331 will drive the sliding block 322 to move along the guide groove 311 through the connecting rod 332. When the pressing pad 326 moves to the positions of the vertical push block 328, the corner push block 329 and the horizontal push block 340, insert the square block into the corresponding positioning sleeve 335 so that the pressing pad 326 stably presses the mounting bracket.

[0052] Refer to Figure 2 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown in

[0053] The positioning assembly 42 includes a plurality of wedge blocks 421 horizontally and evenly fixed at the bottom of the fixed plate 41, a through groove is commonly provided on all the wedge blocks 421 and the fixed plate 41, a pull rod 422 is commonly slidably connected between the movable plate 411 and the vertical mounting block 412, a clearance groove is symmetrically provided in the vertical mounting block 412, an inner plate is fixed on the side of the pull rod 422 and corresponds to the position of the clearance groove, a return spring is connected between the inner plate and the clearance groove, the pull rod 422 is also foldable, and a positioning block 423 cooperating with the wedge block 421 is fixed on the pull rod 422 below the wedge block 421.

[0054] The clamping assembly 43 includes a mounting sleeve 431 fixed on the top of the vertical mounting block 412. The mounting sleeve 431 is U-shaped and has a transmission plate 432 pushed by the tension rod 422 in a vertical sliding connection in its horizontal section. A connecting spring is connected between the transmission plate 432 and the horizontal section of the mounting sleeve 431. The two horizontal sections of the mounting sleeve 431 are symmetrically and horizontally slidably connected with clamping claws 433. Right-angle conductive sheets are symmetrically fixed on the sides of the clamping claws 433. Conductive connectors are provided on the opposite sides of the two clamping claws 433. The conductive connectors slide through the mounting sleeve 431. Track plates 434 are fixed at the bottom of the two clamping claws 433. Track grooves are provided on the track plate 434. The two track grooves are distributed in an inverted eight shape. Push rods 435 are fixed at the left and right ends of the transmission plate 432 and corresponding to the track grooves.

[0055] The top of the movable plate 411 is symmetrically fixed with locking positioning plates 436, and each locking positioning plate 436 is slidably penetrated by a locking rod 437. A horizontal spring is connected between the locking rod 437 and the locking positioning plate 436. The vertical mounting block 412 is symmetrically provided with locking holes, which are composed of a flared part and a square part. The pull rod 422 is fixed with a locking protrusion 438 corresponding to the square part of the locking hole.

[0056] The clamping mechanism 4 can quickly clamp and contact the exposed end of the power bus, so that the power bus can be stably conductive through the clamping mechanism 4, and the clamping claw 433 can be clamped to fully fit the structure of the exposed end of the power bus through the right-angle conductive sheet to ensure the conductive effect of the clamping claw 433. At the same time, the locking rod 437 cooperates with the pull rod 422 to first release the clamp and then move downward as a whole, which can avoid the situation where the position of the power bus changes or the connection between the power bus and the mounting bracket becomes loose after the clamping claw 433 completes the test of the power bus; the position of the clamped power bus can be quickly adjusted by cooperating with the clamping assembly 43 through the adjustment assembly 42, and then the insulation resistance between different power bus live wires and the mounting bracket can be tested, and the positioning of the clamping assembly 43 by the wedge block 421 and the positioning block 423 can ensure that the clamping assembly 43 is accurately aligned with the position of different power bus live wires.

[0057] Specifically, after the installation and positioning of the megohmmeter 23 are completed, first connect the conductive joint on the clamping jaw 433 to the L terminal of the megohmmeter 23 through a connecting wire; after the lifting platform 2 has risen completely, at this time the installation sleeve 431 is located at the position of the power busbar on the far right. Before the installation sleeve 431 rises to the height of the power busbar, first fold the pull rod 422 and pull the pull rod 422. At this time, the pull rod 422 will be located below the position of the transmission plate 432. When the clamping jaw 433 is located on both sides of the exposed end of the power busbar, release the pulling action on the pull rod 422. At this time, the pull rod 422 will push the transmission plate 432 upward due to the elastic force of the return spring, so that the transmission plate 432 moves upward and compresses the connecting spring. As the transmission plate 432 moves upward, the transmission plate 432 will synchronously drive the two push rods 435 to push the track grooves on the two track plates 434, and then make the two track plates 434 and the clamping jaw 433 move toward each other. The clamping jaw 433 will complete the clamping action on the four corners of the exposed end of the power busbar through the right-angle conductive sheet, and at the same time the locking rod 437 will snap into the locking hole.

[0058] Subsequently, control the motor 222 to drive the circular plate 223 to rotate, so as to drive the rocker arm of the megohmmeter 23 to rotate through the circular plate 223 until a stable value appears on the megohmmeter 23. Subsequently, the vertical value will be recorded in the megohmmeter 23. After the insulation resistance of all positions of a single power busbar and the mounting bracket has been measured, the tester manually pulls down the pull rod 422. At this time, the pull rod 422 will first separate from the transmission plate 432, so that the transmission plate 432 resets under the action of the connecting spring and the clamping jaw 433 moves away from the power busbar. As the pull rod 422 continues to move downward, the pull rod 422 will press against the locking rod 437 through the locking protrusion 438, so that the locking rod 437 moves away from the locking hole position. Subsequently, the pull rod 422 will synchronously drive the vertical mounting block 412 to move downward until the installation sleeve 431 moves to a height lower than the power busbar. Subsequently, the operator slides the vertical mounting block 412 and the pull rod 422 horizontally, so that the positioning block 423 quickly snaps into the space between the two wedge-shaped blocks 421 at other positions. Subsequently, repeat the above actions and complete the measurement of the insulation resistance between the live wire of the power busbar at different positions and the mounting bracket.

[0059] After the measurement is completed, all data are collected and analyzed for comparison. The insulation performance is evaluated based on the rated voltage of the power busbar. If the rated voltage of the power busbar is less than or equal to 1000 volts, the insulation resistance data should be greater than or equal to 1 megohm. If there is data less than 1 megohm in the measurement data, it indicates that the insulation performance between the power busbar and the mounting bracket is poor and needs to be checked. If there is no data less than 1 megohm in the measurement data, it indicates that the insulation performance between the power busbar and the mounting bracket meets the requirements; if the rated voltage of the power busbar is greater than 1000 volts, the ratio of the insulation resistance data to the rated voltage, that is, a megohm / b kilovolts, should be greater than or equal to 1. If there is data less than 1 in the ratio of the measurement data to the rated voltage, it indicates that the insulation performance between the power busbar and the mounting bracket is poor and needs to be checked. If there is no data less than 1 megohm in the ratio of the measurement data to the rated voltage, it indicates that the insulation performance between the power busbar and the mounting bracket meets the requirements.

[0060] It should be noted that in order to further ensure the safety of the test personnel, insulation is required between the clamping jaws 433 and the track plate 434 and the mounting sleeve 431 through insulating materials, and insulation is also required between the pressing pad 326 and the clamping plate 325 through insulating materials.

[0061] The working steps of the present invention are as follows: In the first step, the whole test equipment is placed under the power busbar to be tested and the mounting bracket. The position of the mounting bracket is adjusted in advance to ensure that the exposed end at the rear of the power busbar can be contacted by the clamping mechanism 4; a hand-cranked megohmmeter 23 with a matching range is selected according to the rated voltage of the power busbar, and it is placed on the top of the mounting seat 221. The rocker arm passes through the round hole of the round plate 223, and the two-sided pressure plate 225 is driven by rotating the bidirectional threaded rod 224 to tightly press the megohmmeter 23, completing the installation of the megohmmeter 23.

[0062] In the second step, after the megohmmeter 23 is installed, the conductive wire of the pressing pad 326 in the positioning mechanism 3 is connected to the E terminal of the megohmmeter 23 through a connecting wire, and then the conductive joint in the clamping mechanism 4 is connected to the L terminal of the megohmmeter 23 through a connecting wire; then the lifting platform 2 is driven by a cylinder to rise to a preset height, the positioning mechanism 3 moves to the horizontal section of the mounting bracket, and the clamping mechanism 4 aligns with the exposed end of the power busbar; before the lifting platform 2 rises, the folding lock of the operating rod 333 is released, and the operating rod 333 is pushed to drive the limit slider 331 to move upward. Through the connecting rod 332, the sliding block 322 is linked to move along the guiding groove 311 until the pressing pad 326 presses the front and rear sides of the horizontal section of the mounting bracket through the horizontal push block 340, and the square block is inserted into the positioning sleeve 335 to fix the position.

[0063] Step 3: Control the clamping jaw 433 to push the transmission plate 432 by the elastic force of the return spring of the pull rod 422, drive the track plate 434 to drive the clamping jaw 433 to clamp the four corners of the exposed end of the power busbar, and the locking rod 437 is inserted into the locking hole; Shake the rocker arm of the megohmmeter 23, record the stable insulation resistance value and store it.

[0064] Step 4: After completing the horizontal section test, drive the slider 322 to move along the inclined section of the guide groove 311 through the transmission component 33, and stop when the pressure pad 326 contacts the corner push block 329, press the front and rear sides of the corner of the mounting bracket and test; Repeat the operation until the vertical section test is completed; Pull down the pull rod 422 to release the locking of the clamping jaw 433, horizontally slide the vertical mounting block 412 to the next power busbar position, and repeat the clamping and measurement process.

[0065] Step 5: After the insulation resistance measurement between all the live wires of the power busbar and the mounting bracket is completed, control the cylinder to drive the scissor structure to return the lifting platform 2 to its original position, then collect all the test data in the megohmmeter 23, and determine whether its insulation performance meets the requirements according to the rated voltage of the power busbar.

[0066] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and still be covered by the protection scope of the present invention.

Claims

1. A power busbar insulation performance testing device, including a base, characterized in that, A lifting platform is installed on the top of the base through a lifting component. A U-shaped frame is fixed on the top of the lifting platform. A hand-cranked megohmmeter is installed on the U-shaped frame through an installation component. A positioning mechanism for positioning the installation bracket of the power bus is arranged on the right vertical section of the U-shaped frame. A clamping mechanism for clamping the power bus is arranged at the rear of the two vertical sections of the U-shaped frame. The lifting component is used to smoothly adjust the height of the lifting platform. The positioning mechanism includes a guide plate fixed to the top of the right vertical section of the U-shaped frame. Two guide grooves are formed inside the guide plate. A moving component for positioning and testing the installation bracket is arranged on the two guide grooves. Through the cooperation of the two guide grooves and the moving component, the corner positions of the installation bracket are fitted and the test positions are switched. A transmission component for driving the moving component is arranged on the moving component, the base and the U-shaped frame. The clamping mechanism includes fixing plates fixed to the rear sides of the two vertical sections of the U-shaped frame. A moving plate is connected to the fixing plates through a horizontally arranged position adjustment component. A vertical spring is connected to the top of the moving plate and a vertical mounting block. A clamping component for clamping the exposed position of the power bus is arranged inside the vertical mounting block.

2. The power busbar insulation performance testing device according to claim 1, wherein The installation component includes an installation seat fixed to the top of the horizontal section of the U-shaped frame. A hollow groove is formed inside the installation seat. A motor is installed on the top of the horizontal section of the U-shaped frame and located at the position of the hollow groove through a motor sleeve. A circular plate is fixed to the output end of the motor. A plurality of circular holes are evenly formed in the circumferential direction on the circular plate. The rocker arm of the megohmmeter is limited through the circular holes. A stabilizing structure for stabilizing the megohmmeter is arranged on the two vertical sections of the U-shaped frame.

3. The insulation performance testing device for a power bus according to claim 2, wherein, The stabilizing structure includes a bidirectional threaded rod rotatably installed on the two vertical sections of the U-shaped frame. The left end slidably penetrates through the U-shaped frame and is fixed with a crank. Two pressure plates are symmetrically threaded on the bidirectional threaded rod. A limiting rod for limiting the pressure plate is fixed to the side of the pressure plate close to the corresponding vertical section of the U-shaped frame. The limiting rod slidably penetrates through the vertical section of the U-shaped frame at the corresponding position.

4. The insulation performance testing device for a power busbar according to claim 1, wherein, The moving component includes a sliding block slidably connected to the two guide grooves through a guide rod. A U-shaped mounting plate is fixed to the top of the sliding block. Transmission push rods slidably penetrate through the front and rear symmetry of the two vertical sections of the U-shaped mounting plate. A compression spring is connected between the side of each transmission push rod and the vertical section of the U-shaped mounting plate. Clamping plates are fixed to the opposite sides of the two transmission push rods. Multiple pressing pads are fixed to the opposite sides of the two clamping plates.

5. The insulation performance testing device for a power bus according to claim 4, wherein, Connecting plates are symmetrically fixed to the front and rear sides of the guide plate. Vertical push blocks, corner push blocks and horizontal push blocks are fixed to the opposite sides of the two connecting plates. The transmission push rods are pushed by the vertical push blocks, corner push blocks and horizontal push blocks in sequence and the pressing pads are cooperated to complete the pressing of the installation bracket and the testing at different positions.

6. The insulation performance testing device for a power bus according to claim 1, characterized in that, The transmission component includes a limiting slider vertically slidably connected to the right vertical section of the U-shaped frame. A connecting rod for driving the moving component to move is jointly hinged between the limiting slider and the moving component. An operating rod is fixed to the bottom of the limiting slider. The operating rod is foldable and its position is locked through a square block. A limiting structure for limiting the operating rod is arranged between the operating rod and the base.

7. An insulation performance testing device for a power bus according to claim 6, characterized in that, The limiting structure includes a vertical groove opened at the right end of the base. A sliding column is slidably connected in the vertical groove. Three positioning sleeves are vertically and evenly fixed on the side of the sliding column close to the operating rod. The positioning sleeves can cooperate with the square block to position the operating rod. A connecting structure is provided between the front side of the sliding column and the base.

8. The insulation performance testing device for a power busbar according to claim 1, characterized in that, The position adjusting assembly includes a plurality of wedge-shaped blocks horizontally and evenly fixed at the bottom of the fixing plate. A through groove is commonly opened in all the wedge-shaped blocks and the fixing plate. A pull rod is slidably connected between the moving plate and the vertical mounting block. Yielding grooves are symmetrically opened in the front and rear of the vertical mounting block. An embedded plate is fixed on the side of the pull rod corresponding to the yielding groove. A return spring is connected between the embedded plate and the yielding groove. The pull rod is also a folding type and a positioning block cooperating with the wedge-shaped block is fixed at the position below the wedge-shaped block.

9. The insulation performance testing device for a power busbar according to claim 8, characterized in that, The clamping assembly includes a mounting sleeve fixed at the top of the vertical mounting block. The mounting sleeve is U-shaped and a transmission plate pushed by the pull rod is vertically slidably connected in the horizontal section thereof. A connecting spring is connected between the transmission plate and the horizontal section of the mounting sleeve. Two clamping claws are symmetrically and horizontally slidably connected to the two horizontal sections of the mounting sleeve. Trajectory plates are fixed at the bottoms of the two clamping claws. Trajectory grooves are opened in the trajectory plates. Pushing rods are fixed at the left and right ends of the transmission plate corresponding to the trajectory grooves.

10. The power busbar insulation performance testing device according to claim 9, characterized in that, Locking and positioning plates are symmetrically fixed at the left and right of the top of the moving plate. A locking rod is slidably penetrated through each locking and positioning plate. A horizontal spring is connected between the locking rod and the locking and positioning plate. Locking holes are symmetrically opened in the left and right of the vertical mounting block. The locking holes are composed of a flared part and a square part. A locking protrusion is fixed on the pull rod corresponding to the square part of the locking hole.

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