Multi-current controllable capacitor DVDT testing device

Abstract

The invention discloses a multi-current controllable capacitor DVDT testing device, and belongs to the technical field of capacitor DVDT testing devices. Comprising a control cabinet, a detection cabinet, a discharging port, a material conveying device, a movable wiring assembly, a feeding device, a discharging hopper and a safety protection mechanism, a position adjusting motor is used for driving two wiring devices to adjust the distance, the distance between the wiring devices corresponds to the distance between two contacts of a capacitor, a wiring air cylinder is used for driving a wiring end to conduct automatic wiring, and the wiring efficiency is improved. Accurate wiring of capacitors of various specifications is met, and the risk of electric shock caused by manual wiring is avoided. Capacitors to be detected are tidily stacked through the feeding device, continuous feeding is achieved through the feeding plate, the feeding plate, the front barrier strip and the pressing plate form an open type discharging area, and the stacking requirement of the capacitors of various sizes is met. The conveying belt is used for driving the multiple conveying plates, the next capacitor is driven to enter a to-be-detected area while discharging is conducted, and continuous detection and discharging of the multiple capacitors are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitor DVDT testing devices, in particular to a capacitor DVDT testing device with controllable multiple currents. Background Art

[0002] Film capacitors, due to their small size, light weight, high stability, and excellent frequency characteristics, play a key role in a variety of fields, including electronics, communications, medical equipment, energy, power systems, automotive electronics, home appliances, industrial automation, and new energy. They are widely used for charge storage, filtering, coupling, frequency regulation, and radio frequency noise suppression, effectively improving circuit performance and overall system reliability. Testing the DV / DT (voltage rate of change) of film capacitors is an important method for evaluating capacitor performance under conditions of rapid voltage changes. DV / DT testing can help determine the stability and reliability of capacitors in high-frequency or pulse voltage applications.

[0003] During the test, by setting rapidly changing voltage conditions, high-precision test equipment is used to monitor the voltage and current waveforms of the capacitor during rapid voltage changes, and the capacitance stability, loss changes, and whether damage occurs are recorded and analyzed to evaluate its performance in a high voltage change rate environment. This testing process ensures the accuracy of capacitor selection and application, while improving the optimization and reliability of circuit design. However, the test devices currently available on the market require manual cooperation to fully adjust the voltage, resulting in low detection efficiency and posing a great safety hazard to operators. In addition, film capacitors will heat up during testing and, under the action of high voltage electricity, may even spontaneously combust or explode due to their own quality problems. Summary of the Invention

[0004] The object of the present invention is to provide a capacitor DVDT testing device with multiple controllable currents to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a capacitor DVDT testing device with multi-current controllable, comprising a testing cabinet, a control cabinet is provided on one side of the testing cabinet, a discharge port is provided on the other side of the testing cabinet, a lower support plate and an upper support plate are installed in the testing cabinet, a safety protection mechanism and a loading device are installed on the lower support plate, the safety protection mechanism is connected to the upper support plate, a lower hopper is installed on the upper support plate, a mobile wiring assembly is installed in the testing cabinet, and a material transport device is installed in the testing cabinet.

[0006] The control cabinet houses a control system that controls the entire test setup. The test cabinet charges and discharges the capacitors being tested, transmitting the detected electrical signals to the control system, which analyzes the collected signals to determine the capacitor's charge and discharge performance.

[0007] The mobile wiring assembly includes a positioning cylinder and a connecting slider. The positioning cylinder is installed in the detection cabinet. A connecting plate is installed on the output shaft of the positioning cylinder. A positioning motor is installed on the connecting plate. A transmission device is installed on the telescopic connecting plate. The output shaft of the positioning motor passes through the connecting plate and is installed with a threaded rod. The threaded rod is rotatably connected to the connecting plate. A connecting slider is symmetrically and threadedly installed on the threaded rod. The threaded rod is provided with symmetrical and opposite threads. A sliding rod is installed on the connecting plate. The sliding rod passes through the connecting slider. A wiring device is installed on the connecting slider. A protective rod is slidably installed on the wiring device. Both ends of the protective rod are connected to the transmission device.

[0008] The control system starts the positioning motor and rotates the output shaft of the positioning motor according to the distance between the two contacts of the capacitor to be tested. The output shaft of the positioning motor drives the threaded rod to rotate, and the threaded rod drives the connecting slider to rotate. Since the connecting slider is restricted by the sliding rod, the rotation is converted into sliding on the sliding rod. The connecting slider drives the wiring device to slide. Under the action of the symmetrical opposite threads of the threaded rod, the two wiring devices are simultaneously moved closer or farther away until the distance between the wiring devices corresponds to the distance between the two contacts of the capacitor.

[0009] The wiring device includes a wiring housing, the top of the wiring housing is connected to the wiring slider, a wiring rack is slidably installed in the wiring housing, a wiring gear is rotatably installed in the wiring housing, the wiring gear is meshed with the wiring racks on both sides for transmission, a sliding housing is installed at the bottom end of the wiring rack, a limit block is vertically slidably installed in the sliding housing, a sliding column is installed on the top of the limit block, a sliding spring is installed between the limit block and the sliding housing, the sliding column passes through the sliding spring, a wiring terminal is horizontally slidably installed in the sliding housing, a groove is provided on the top of the wiring terminal, the wiring terminal is engaged with the limit block through the groove, a connecting piece is installed on the limit block, the connecting piece is slidably connected to the protective rod, a protective spring is installed between the connecting terminal and the sliding housing, a wiring cylinder is installed on the connecting housing, the wiring cylinder passes through the connecting housing and is connected to the wiring rack.

[0010] The control system activates the positioning cylinder, which drives the entire mobile wiring assembly downward until the wiring device reaches a suitable height for wiring and stops. The control system then activates the wiring cylinder, and the output shaft of the wiring cylinder slides the wiring rack. The wiring rack, through the wiring gear, drives the wiring rack on the other side to slide. The wiring rack drives the sliding housing closer together, bringing the wiring terminals on the sliding housing closer together until the terminals clamp the two contacts of the capacitor, completing the autonomous wiring. The test assembly in the test cabinet then charges and discharges the capacitor to be tested through the terminal terminals and transmits the detected electrical signals to the control system. The control system analyzes the collected signals to determine the capacitor's charge and discharge performance. The control system then activates the loading device, which delivers the next capacitor to be tested to the transport device. The transport device activates, and the transport plate moves the tested capacitor to the lower hopper. The capacitor slides from the lower hopper to the discharge port, and the next capacitor to be tested is simultaneously positioned. This cycle repeats to complete the testing of the entire group of capacitors.

[0011] The transmission device includes a power-assisting plate, which is connected to the connecting plate. A transmission column is slidably installed on the power-assisting plate. An upper connecting block is installed on the top of the transmission column. A power-assisting spring is installed between the upper connecting block and the power-assisting plate. A transmission connecting rod is installed on the top of the upper connecting block. The transmission connecting rod is connected to the protective rod. A slide block is installed at the bottom of the transmission column, and a slide is provided at the bottom of the slide block.

[0012] The assist spring contracts due to the gravity of the upper connecting block, the transfer column and the slide block, and at the same time plays a role in offsetting the gravity, reducing the thrust of the first contact to drive the upper connecting block, the transfer column and the slide block to move upward. By replacing the assist springs with different elastic forces, the thrust required for the first contact can be changed, thereby achieving the purpose of adjusting the thrust required for different first contacts according to different capacitor specifications, and preventing the power-off protection function from being triggered due to too small a thrust.

[0013] 5. A capacitor DVDT test device with multiple current controllable according to claim 4, characterized in that the safety protection mechanism includes a second electric telescopic rod, an electric valve, and a protective box. The protective box is mounted on the lower support plate. The bottom end of the second electric telescopic rod is connected to the lower support plate. The top end of the second electric telescopic rod is mounted with a reset plate. A limit post is slidably mounted on the reset plate. A guard plate assembly is mounted on the limit post. The electric valve is mounted on the bottom end of the upper support plate. The protective box is externally connected to a cold air delivery device. The protective box is made of high-temperature resistant and explosion-proof material. The cold air delivery device is used to fill the protective box with low-temperature, flame-retardant gas.

[0014] The guard plate assembly includes a sliding plate and a sliding nail. A heat conducting plate is installed on the sliding plate. A lower temperature sensing plate is installed on the heat conducting plate. An upper temperature sensing plate is installed on the top of the lower temperature sensing plate. A first contact is installed on the top of the upper temperature sensing plate. The first contact is slidably connected to the slide block. External temperature sensing strips and internal temperature sensing strips are connected on both sides of the heat conducting plate through sliding nails. The external temperature sensing strips are connected to the internal temperature sensing strips. A second contact is installed on the external temperature sensing strip. Card strips are slidably installed on both sides of the sliding plate. A limiting spring is installed between the card strip and the heat conducting plate. A limiting rack is installed on the card strip. A limiting gear is rotatably installed on the sliding plate. A sliding rack is slidably installed on the sliding plate. The sliding rack is meshed with the limiting gear for transmission, and the limiting gear is meshed with the limiting rack for transmission.

[0015] When the capacitor becomes hot due to unqualified performance or problems, the heat conducting plate at the bottom of the capacitor will transfer the heat to the upper temperature sensing piece and the lower temperature sensing piece, which drive the first contact to lift, and the first contact moves in the slide groove of the slide groove block, and drives the slide groove block to slide upward, and the slide groove block drives the transfer column to slide upward, and the transfer column drives the upper connecting block to slide upward, and the upper connecting block drives the protective rod to move upward through the transfer connecting rod, and the protective rod drives the limit block to slide upward through the connecting piece, and the limit block slides out of engagement with the wiring terminal, and the wiring terminal slides in the sliding housing under the action of the tension of the protective spring, and the wiring terminal slides to disconnect from the capacitor contact. At the same time, the control system sends a reminder signal to the staff. After the capacitor has been standing for a period of time without any abnormality, the staff can check the capacitor and reset the wiring device, thereby achieving primary protection for the capacitor.

[0016] When the power is off, the capacitor continues to heat up, and there is even a risk of spontaneous combustion or explosion. The heat conducting plate will continue to transfer heat to the outer temperature sensing strip and the inner temperature sensing strip, causing the outer temperature sensing strip and the inner temperature sensing strip to bend, and the outer temperature sensing strip bends toward the inner temperature sensing strip. The outer temperature sensing strip and the inner temperature sensing strip bend and arch, thereby driving the second contact to move, and the second contact drives the sliding rack to move, and the sliding rack drives the limiting rack to slide in the opposite direction through the limiting gear, and the limiting rack drives the card strip to contract. After the guard plate assembly loses the support of the card strip, it drives the capacitor to fall into the protection box, and the control system closes the electric valve and starts the cold air delivery device at the same time. The cold air delivery device fills the protection box with low-temperature flame-retardant gas to force cooling of the capacitor. After cooling is completed, the control system opens the electric valve and the second electric telescopic rod. The output shaft of the second electric telescopic rod drives the guard plate assembly to reset upward through the reset plate. The cooled card strip is reset under the action of the limit spring, so that the guard plate assembly is placed on the upper support plate again, thereby achieving secondary protection for the capacitor.

[0017] The material transport device includes a material transport connecting rod, which is installed in the detection cabinet. Electric rollers are rotatably installed between the material transport connecting rods, a material transport belt is installed between the electric rollers, and a material transport plate is installed on the material transport belt.

[0018] After loading is completed, the control system turns on the electric roller, which drives the transport belt to rotate, the transport belt drives the transport plate to rotate, and the transport plate drives the capacitor to be tested to slide sideways, so that the capacitor is located in the center of the heat conduction plate.

[0019] The loading device consists of a first electric telescopic rod, a press plate, and a front bar. The bottom of the first electric telescopic rod is mounted on the lower support plate, and the top of the first electric telescopic rod is mounted on the loading plate. The front bar is mounted on the lower support plate, and the press plate is mounted on a press spring, which is connected to the inspection cabinet. The loading plate, front bar, and press plate form an open unloading area to accommodate the stacking needs of capacitors of various sizes.

[0020] The staff first stacks the capacitors to be tested on the loading plate, positioning the front bar between the capacitor's two contacts. The pressure plate, under the action of the pressure spring, presses the capacitors firmly in place. The control system activates the first electric telescopic rod, whose output shaft drives the loading plate upward, which in turn raises the capacitors until the bottom surface of the capacitors to be tested is flush with the top surface of the upper support plate, completing the loading process.

[0021] The upper temperature sensing piece, the lower temperature sensing piece, the external temperature sensing strip and the internal temperature sensing strip are all made of metal materials with high thermal expansion coefficient. The thermal expansion coefficient of the lower temperature sensing piece is greater than that of the upper temperature sensing piece, the thermal expansion coefficient of the external temperature sensing strip is greater than that of the internal temperature sensing strip, and the thermal expansion coefficients of the upper and lower temperature sensing pieces are greater than those of the external and internal temperature sensing strips.

[0022] When two metal sheets with different thermal expansion coefficients are stacked, the metal sheet with a larger thermal expansion coefficient will bend toward the metal sheet with a smaller thermal expansion coefficient. When heated, the lower temperature sensing sheet will bend toward the upper temperature sensing sheet, and the outer temperature sensing strip will bend toward the inner temperature sensing strip.

[0023] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention utilizes a positioning motor to drive the two wiring devices to adjust the spacing so that the spacing of the wiring devices corresponds to the spacing of the two contacts of the capacitor, and the wiring cylinder drives the wiring terminals to automatically connect the wires, which not only meets the precise wiring of capacitors of various specifications, but also avoids manual wiring, improves wiring efficiency, and avoids the risk of electric shock caused by manual wiring.

[0024] The capacitors to be tested are neatly stacked using a loading device, and continuous loading is achieved through a loading plate. An open unloading area is formed by the loading plate, front baffle and pressing plate to meet the stacking needs of capacitors of various sizes.

[0025] The conveyor belt drives multiple conveyor plates, and while unloading, it also drives the next capacitor into the test area, achieving continuous testing and unloading of multiple capacitors without manual loading and unloading, thus improving testing efficiency.

[0026] The upper and lower temperature-sensing plates convert the heat of the capacitor into deformation, which is then transferred to the protective rod. The protective rod then drives the limit block, freeing the terminal from the limit block and disconnecting the capacitor contacts, thus achieving self-power-off protection when the capacitor temperature is too high. The external and internal temperature-sensing strips drive the clamping strip to contract, forcing the overheated capacitor into the protective box for forced cooling, thus preventing the risk of spontaneous combustion or explosion.

[0027] The thermal deformation is transferred to the protection rod by using a transmission device. By replacing the assist springs with different elastic forces, the thrust required for the first contact is changed, thereby achieving the purpose of adjusting the thrust required for different first contacts according to different capacitor specifications, and preventing the power-off protection function from being triggered due to too small a thrust. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is an overall elevation view of the testing device of the present invention; Figure 2 is a partial elevation view of the test device of the present invention; Figure 3 is a partial lower elevation view of the testing device of the present invention; Figure 4 is an elevational view of the mobile wiring assembly of the present invention; Figure 5 is an elevational view of the wiring device of the present invention; Figure 6 The present invention Figure 5 A partial enlarged view of area A in the middle; Figure 7 The present invention Figure 5 A partial enlarged view of the middle B area; Figure 8 The present invention Figure 5 A partial enlarged view of the middle C area; In the figure: 1. control cabinet; 2. detection cabinet; 3. discharge port; 4. material transport device; 5. mobile wiring assembly; 6. loading device; 7. lower hopper; 8. safety protection mechanism; 61. pressing plate; 62. pressing spring; 63. loading plate; 64. first electric telescopic rod; 65. front stop bar; 41. material transport connecting rod; 42. material transport plate; 43. material transport belt; 44. electric roller; 21. lower support plate; 22. upper support plate; 51. connecting plate; 52. positioning motor; 53. sliding rod; 54. threaded rod; 55. wiring device; 56. protection rod; 57. transmission device; 58. connecting slide; 551. wiring housing; 552. wiring cylinder; 553. wiring rack; 554. wiring gear; 555. wiring terminal; 556. sliding housing; 557. limit block; 5 58. Sliding column; 559. Sliding spring; 5510. Connecting plate; 5511. Protective spring; 571. Power-assisting plate; 572. Transmission connecting rod; 573. Upper connecting block; 574. Transmission column; 575. Power-assisting spring; 576. Slide block; 81. Second electric telescopic rod; 82. Reset plate; 83. Limiting column; 84. Guard plate assembly; 85. Protective box; 841. Sliding plate; 842. First contact; 843. Upper temperature sensor; 844. Lower temperature sensor; 845. Card strip; 846. Limiting spring; 847. Limiting rack; 848. Sliding rack; 849. Limiting gear; 8410. Second contact; 8411. External temperature sensor; 8412. Internal temperature sensor; 8413. Slide pin; 59. Positioning cylinder; 86. Electric valve; 8414. Heat transfer plate. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 1-8 The present invention provides a technical solution: a capacitor DVDT test device with multi-current controllable, including a detection cabinet 2, a control cabinet 1 is provided on one side of the detection cabinet 2, a discharge port 3 is provided on the other side of the detection cabinet 2, a lower support plate 21 and an upper support plate 22 are installed in the detection cabinet 2, a safety protection mechanism 8 and a loading device 6 are installed on the lower support plate 21, the safety protection mechanism 8 is connected to the upper support plate 22, a lower hopper 7 is installed on the upper support plate 22, a mobile wiring assembly 5 is installed in the detection cabinet 2, and a material transport device 4 is installed in the detection cabinet 2.

[0031] Control cabinet 1 houses a control system that controls the entire test setup. Test cabinet 2 is used to charge and discharge the capacitors being tested, transmitting the detected electrical signals to the control system, which analyzes the collected signals to determine the capacitor's charge and discharge performance.

[0032] The mobile wiring assembly 5 includes a positioning cylinder 59 and a connecting slider 58. The positioning cylinder 59 is installed in the detection cabinet 2. A connecting plate 51 is installed on the output shaft of the positioning cylinder 59. A positioning motor 52 is installed on the connecting plate 51. A transmission device 57 is installed on the telescopic connecting plate 51. The output shaft of the positioning motor 52 passes through the connecting plate 51 and is installed with a threaded rod 54. The threaded rod 54 is rotatably connected to the connecting plate 51. A connecting slider 58 is symmetrically and threadedly installed on the threaded rod 54. The threaded rod 54 is provided with symmetrical and opposite threads. A sliding rod 53 is installed on the connecting plate 51. The sliding rod 53 passes through the connecting slider 58. A wiring device 55 is installed on the connecting slider 58. A protective rod 56 is slidably installed on the wiring device 55. Both ends of the protective rod 56 are connected to the transmission device 57.

[0033] The loading device 6 comprises a first electric telescopic rod 64, a press plate 61, and a front stop 65. The bottom end of the first electric telescopic rod 64 is mounted on the lower support plate 21, the top end of the first electric telescopic rod 64 is mounted on the loading plate 63, and the front stop 65 is mounted on the lower support plate 21. The press plate 61 is mounted with a press spring 62, which is connected to the inspection cabinet 2. The loading plate 63, front stop 65, and press plate 61 form an open unloading area to meet the stacking requirements of capacitors of various sizes.

[0034] The material transport device 4 includes a material transport connecting rod 41, which is installed in the detection cabinet 2. Electric rollers 44 are rotatably installed between the material transport connecting rods 41, and a material transport belt 43 is installed between the electric rollers 44. A material transport plate 42 is installed on the material transport belt 43.

[0035] The wiring device 55 includes a wiring housing 551, the top of which is connected to the wiring slider, a wiring rack 553 is slidably installed in the wiring housing 551, a wiring gear 554 is rotatably installed in the wiring housing 551, the wiring gear 554 is meshed with the wiring racks 553 on both sides for transmission, a sliding housing 556 is installed at the bottom of the wiring rack 553, a limit block 557 is vertically slidably installed in the sliding housing 556, a sliding column 558 is installed at the top of the limit block 557, and a sliding spring is installed between the limit block 557 and the sliding housing 556. 559, the sliding column 558 passes through the sliding spring 559, and a wiring terminal 555 is installed in the sliding shell 556 for horizontal sliding. A groove is provided on the top of the wiring terminal 555, and the wiring terminal 555 is engaged with the limit block 557 through the groove. A connecting piece 5510 is installed on the limit block 557, and the connecting piece 5510 is slidably connected to the protection rod 56. A protection spring 5511 is installed between the connecting terminal and the sliding shell 556, and a wiring cylinder 552 is installed on the connecting shell. The wiring cylinder 552 passes through the connecting shell and is connected to the wiring rack 553.

[0036] The transmission device 57 includes a power-assisting plate 571, which is connected to the connecting plate 51. A transmission column 574 is slidably installed on the power-assisting plate 571. An upper connecting block 573 is installed on the top of the transmission column 574. A power-assisting spring 575 is installed between the upper connecting block 573 and the power-assisting plate 571. A transmission connecting rod 572 is installed on the top of the upper connecting block 573. The transmission connecting rod 572 is connected to the protective rod 56. A slide block 576 is installed at the bottom of the transmission column 574, and a slide block 576 is provided at the bottom of the slide block 576.

[0037] The assist spring 575 contracts due to the gravity of the upper connecting block 573, the transfer column 574 and the slide block 576, and at the same time plays a role in offsetting the gravity, reducing the thrust of the first contact 842 to drive the upper connecting block 573, the transfer column 574 and the slide block 576 to move upward. By replacing the assist spring 575 with different elastic forces, the thrust required for the first contact 842 is changed, thereby achieving the purpose of adjusting the thrust required for different first contacts 842 according to different capacitor specifications, and preventing the power-off protection function from being triggered due to too small a thrust.

[0038] The safety mechanism 8 includes a second electric telescopic rod 81, an electric valve 86, and a protective box 85. The protective box 85 is mounted on the lower support plate 21. The bottom end of the second electric telescopic rod 81 is connected to the lower support plate 21. A reset plate 82 is mounted on the top of the second electric telescopic rod 81. A limit post 83 is slidably mounted on the reset plate 82. A guard plate assembly 84 is mounted on the limit post 83. The electric valve 86 is mounted on the bottom end of the upper support plate 22. The protective box 85 is connected to a cold air delivery device. The protective box 85 is made of high-temperature resistant and explosion-proof material, and the cold air delivery device is used to fill the protective box 85 with low-temperature, flame-retardant gas.

[0039] The guard plate assembly 84 includes a sliding plate 841 and a sliding nail 8413. The sliding plate 841 is equipped with a heat conducting plate 8414. The heat conducting plate 8414 is equipped with a lower temperature sensing piece 844. The top of the lower temperature sensing piece 844 is equipped with an upper temperature sensing piece 843. The top of the upper temperature sensing piece 843 is equipped with a first contact 842. The first contact 842 is slidably connected to the slide block 576. Both sides of the heat conducting plate 8414 are connected to the external temperature sensing strip 8411 and the internal temperature sensing strip 8412 through the sliding nail 8413. The external temperature sensing strip 8411 and the internal temperature sensing strip 8412 are connected. 8412 is connected, a second contact 8410 is installed on the external temperature sensing strip 8411, and a clamping strip 845 is slidably installed on both sides of the sliding plate 841. A limiting spring 846 is installed between the clamping strip 845 and the heat conducting plate 8414, and a limiting rack 847 is installed on the clamping strip 845. A limiting gear 849 is rotatably installed on the sliding plate 841, and a sliding rack 848 is slidably installed on the sliding plate 841. The sliding rack 848 is engaged with the limiting gear 849 for transmission, and the limiting gear 849 is engaged with the limiting rack 847 for transmission.

[0040] The upper temperature-sensing piece 843, the lower temperature-sensing piece 844, the external temperature-sensing strip 8411 and the internal temperature-sensing strip 8412 are all made of metal materials with high thermal expansion coefficients. The thermal expansion coefficient of the lower temperature-sensing piece 844 is greater than that of the upper temperature-sensing piece 843, the thermal expansion coefficient of the external temperature-sensing strip 8411 is greater than that of the internal temperature-sensing strip 8412, and the thermal expansion coefficients of the upper temperature-sensing piece 843 and the lower temperature-sensing piece 844 are greater than those of the external temperature-sensing strip 8411 and the internal temperature-sensing strip 8412.

[0041] When two metal sheets with different thermal expansion coefficients are stacked, the metal sheet with a larger thermal expansion coefficient will bend toward the metal sheet with a smaller thermal expansion coefficient. When heated, the lower temperature sensing sheet 844 will bend toward the upper temperature sensing sheet 843, and the outer temperature sensing strip 8411 will bend toward the inner temperature sensing strip 8412.

[0042] The working principle of the present invention is as follows: the control system starts the positioning motor 52, and according to the spacing between the two contacts of the capacitor to be tested, the output shaft of the positioning motor 52 rotates, the output shaft of the positioning motor 52 drives the threaded rod 54 to rotate, and the threaded rod 54 drives the connecting slider 58 to rotate. Since the connecting slider 58 is restricted by the sliding rod 53, the rotation is converted into sliding on the sliding rod 53, and the connecting slider 58 drives the wiring device 55 to slide. Under the action of the symmetrical opposite threads of the threaded rod 54, the two wiring devices 55 are simultaneously moved closer or farther away until the spacing between the wiring devices 55 corresponds to the spacing between the two contacts of the capacitor.

[0043] The staff first stacks the capacitors to be tested on the loading plate 63, positioning the front stop 65 between the capacitor's two contacts. The pressure plate 61, under the force of the pressure spring 62, presses the capacitors firmly in place. The control system activates the first electric telescopic rod 64, whose output shaft drives the loading plate 63 upward, which in turn raises the capacitors until the bottom surface of the capacitors to be tested is flush with the top surface of the upper support plate 22, completing the loading process.

[0044] After loading is completed, the control system turns on the electric roller 44, the electric roller 44 drives the conveyor belt 43 to rotate, the conveyor belt 43 drives the conveyor plate 42 to rotate, and the conveyor plate 42 drives the capacitor to be tested to slide sideways, so that the capacitor is located in the center of the heat conducting plate 8414.

[0045] The control system turns on the positioning cylinder 59, which drives the mobile wiring assembly 5 to move downward as a whole until the wiring device 55 reaches the wiring position and stops. The control system turns on the wiring cylinder 552, and the output shaft of the wiring cylinder 552 drives the wiring rack 553 to slide. The wiring rack 553 drives the wiring rack 553 on the other side to slide through the wiring gear 554. The wiring rack 553 drives the sliding housing 556 to slide closer, thereby bringing the wiring terminals 555 on the sliding housing 556 closer together until the wiring terminals 555 clamp the two contacts of the capacitor, thereby completing the autonomous wiring. Afterwards, the detection assembly in the detection cabinet 2 charges and discharges the capacitor to be detected through the wiring terminals 555, and transmits the detected electrical signals to the control system. The control system analyzes the collected electrical signals to determine the charge and discharge performance of the capacitor. Then, the control system turns on the loading device 6 and sends the next capacitor to be tested to the transport device 4. The transport device 4 is turned on, and the transport plate 42 drives the tested capacitor to move to the lower hopper 7. The capacitor slides from the lower hopper 7 to the discharge port 3. At the same time, the next capacitor to be tested is in place. This cycle is repeated to complete the test of the entire group of capacitors.

[0046] When the capacitor becomes hot due to unqualified performance or problems, the heat conducting plate 8414 at the bottom of the capacitor transfers the heat to the upper temperature sensing piece 843 and the lower temperature sensing piece 844. The lower temperature sensing piece 844 and the lower temperature sensing piece 844 drive the first contact 842 to lift up. The first contact 842 moves in the slide groove of the slide groove block 576 and drives the slide groove block 576 to slide upward. The slide groove block 576 drives the transfer column 574 to slide upward. The transfer column 574 drives the upper connecting block 573 to slide upward. The upper connecting block 573 drives the protective rod 56 to move upward through the transfer connecting rod 572. The protective rod 56 drives the limit block 557 to slide upward through the connecting piece 5510, and the limit block 557 slides out of the engagement with the wiring terminal 555. The wiring terminal 555 slides in the sliding housing 556 under the pulling force of the protective spring 5511, and the wiring terminal 555 slides to disconnect from the capacitor contact. At the same time, the control system sends a reminder signal to the staff. After the capacitor has been stationary for a period of time without any abnormality, the staff can check the capacitor and reset the wiring device 55, thereby achieving primary protection for the capacitor.

[0047] When the power is turned off and the capacitor continues to heat up, or even has the risk of self-ignition or self-explosion, the heat conducting plate 8414 will continue to transfer heat to the external temperature sensing strip 8411 and the internal temperature sensing strip 8412, causing the external temperature sensing strip 8411 and the internal temperature sensing strip 8412 to bend, and the external temperature sensing strip 8411 bends toward the internal temperature sensing strip 8412. The external temperature sensing strip 8411 and the internal temperature sensing strip 8412 bend and arch, thereby driving the second contact 8410 to move, and the second contact 8410 drives the sliding rack 848 to move, and the sliding rack 848 drives the limiting rack 847 to slide in the opposite direction through the limiting gear 849, and the limiting rack 847 drives the card bar 845 to contract. After the guard plate assembly 84 loses the support of the clamping strip 845, it drives the capacitor to fall into the protection box 85. The control system closes the electric valve 86 and starts the cold air delivery device at the same time. The cold air delivery device fills the protection box 85 with low-temperature flame-retardant gas to force the capacitor to cool down. After the cooling is completed, the control system opens the electric valve 86 and the second electric telescopic rod 81. The output shaft of the second electric telescopic rod 81 drives the guard plate assembly 84 to reset upward through the reset plate 82. The cooled clamping strip 845 is reset under the action of the limit spring 846, so that the guard plate assembly 84 is placed on the upper support plate 22 again, thereby realizing the secondary protection of the capacitor.

[0048] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A capacitor DVDT test device with multiple current controllable features: The testing device comprises a testing cabinet (2), a control cabinet (1) is provided on one side of the testing cabinet (2), a discharge port (3) is provided on the other side of the testing cabinet (2), a lower support plate (21) and an upper support plate (22) are installed in the testing cabinet (2), a safety protection mechanism (8) and a loading device (6) are installed on the lower support plate (21), the safety protection mechanism (8) is connected to the upper support plate (22), a lower hopper (7) is installed on the upper support plate (22), a mobile wiring assembly (5) is installed in the testing cabinet (2), and a material transport device (4) is installed in the testing cabinet (2).

2. The capacitor DVDT test device with multiple current controllable according to claim 1, characterized in that: The movable wiring assembly (5) includes a positioning cylinder (59) and a connecting slide (58), wherein the positioning cylinder (59) is installed in the detection cabinet (2), a connecting plate (51) is installed on the output shaft of the positioning cylinder (59), a positioning motor (52) is installed on the connecting plate (51), a transmission device (57) is installed on the telescopic connecting plate (51), and the output shaft of the positioning motor (52) passes through the connecting plate (51) and is installed with a threaded rod (54), wherein the threaded rod (54) is connected to the connecting plate The plate (51) is rotatably connected, a connecting slider (58) is symmetrically and threadedly mounted on the threaded rod (54), the threaded rod (54) is provided with symmetrical and opposite threads, a sliding rod (53) is mounted on the connecting plate (51), the sliding rod (53) passes through the connecting slider (58), a wiring device (55) is mounted on the connecting slider (58), a protective rod (56) is slidably mounted on the wiring device (55), and both ends of the protective rod (56) are connected to the transmission device (57).

3. The capacitor DVDT test device with multiple current controllable according to claim 2, characterized in that: The wiring device (55) includes a wiring housing (551), the top of the wiring housing (551) is connected to the wiring slider, a wiring rack (553) is slidably installed in the wiring housing (551), a wiring gear (554) is rotatably installed in the wiring housing (551), the wiring gear (554) is meshed with the wiring racks (553) on both sides for transmission, a sliding housing (556) is installed at the bottom end of the wiring rack (553), a limit block (557) is vertically slidably installed in the sliding housing (556), a sliding column (558) is installed at the top of the limit block (557), and a sliding spring is installed between the limit block (557) and the sliding housing (556). (559), the sliding column (558) passes through the sliding spring (559), a wiring terminal (555) is installed in the sliding housing (556) for horizontal sliding, a groove is provided at the top of the wiring terminal (555), the wiring terminal (555) is engaged with the limit block (557) through the groove, a connecting piece (5510) is installed on the limit block (557), the connecting piece (5510) is slidably connected to the protection rod (56), a protection spring (5511) is installed between the connecting terminal and the sliding housing (556), a wiring cylinder (552) is installed on the connecting housing, the wiring cylinder (552) passes through the connecting housing and is connected to the wiring rack (553).

4. The DVDT test device for capacitors with multiple controllable currents according to claim 3, characterized in that: The transmission device (57) includes a power-assisting plate (571), the power-assisting plate (571) is connected to the connecting plate (51), a transmission column (574) is slidably mounted on the power-assisting plate (571), an upper connecting block (573) is mounted on the top of the transmission column (574), a power-assisting spring (575) is mounted between the upper connecting block (573) and the power-assisting plate (571), a transmission connecting rod (572) is mounted on the top of the upper connecting block (573), the transmission connecting rod (572) is connected to the protection rod (56), a slide block (576) is mounted on the bottom of the transmission column (574), and a slide block (576) is provided with a slide at the bottom.

5. The DVDT test device for capacitors with multiple controllable currents according to claim 4, characterized in that: The safety protection mechanism (8) includes a second electric telescopic rod (81), an electric valve (86) and a protection box (85), wherein the protection box (85) is mounted on the lower support plate (21), the bottom end of the second electric telescopic rod (81) is connected to the lower support plate (21), a reset plate (82) is mounted on the top end of the second electric telescopic rod (81), a limit column (83) is slidably mounted on the reset plate (82), a guard plate assembly (84) is mounted on the limit column (83), the electric valve (86) is mounted on the bottom end of the upper support plate (22), and the protection box (85) is externally connected to a cold air delivery device.

6. The capacitor DVDT test device with multiple controllable currents according to claim 5, characterized in that: The guard plate assembly (84) includes a sliding plate (841) and a sliding nail (8413), a heat conducting plate (8414) is installed on the sliding plate (841), a lower temperature sensing plate (844) is installed on the heat conducting plate (8414), an upper temperature sensing plate (843) is installed on the top of the lower temperature sensing plate (844), a first contact (842) is installed on the top of the upper temperature sensing plate (843), the first contact (842) is slidably connected to the slide block (576), both sides of the heat conducting plate (8414) are connected to an external temperature sensing strip (8411) and an internal temperature sensing strip (8412) through the sliding nail (8413), the external temperature sensing strip (8411) and the internal temperature sensing strip (8412) are connected to each other. (8412) is connected, a second contact (8410) is installed on the external temperature sensing strip (8411), a clamping strip (845) is slidably installed on both sides of the sliding plate (841), a limiting spring (846) is installed between the clamping strip (845) and the heat conducting plate (8414), a limiting rack (847) is installed on the clamping strip (845), a limiting gear (849) is rotatably installed on the sliding plate (841), a sliding rack (848) is slidably installed on the sliding plate (841), the sliding rack (848) is meshed with the limiting gear (849) for transmission, and the limiting gear (849) is meshed with the limiting rack (847) for transmission.

7. The capacitor DVDT test device with multiple controllable currents according to claim 1, characterized in that: The material transport device (4) includes a material transport connecting rod (41), the material transport connecting rod (41) is installed in the detection cabinet (2), electric rollers (44) are rotatably installed between the material transport connecting rods (41), a material transport belt (43) is installed between the electric rollers (44), and a material transport plate (42) is installed on the material transport belt (43).

8. The capacitor DVDT test device with multiple current controllable according to claim 1, characterized in that: The feeding device (6) comprises a first electric telescopic rod (64), a pressing plate (61) and a front baffle (65), wherein the bottom end of the first electric telescopic rod (64) is mounted on the lower support plate (21), the top end of the first electric telescopic rod (64) is mounted with a feeding plate (63), the front baffle (65) is mounted on the lower support plate (21), a pressing spring (62) is mounted on the pressing plate (61), and the pressing spring (62) is connected to the detection cabinet (2).

9. The capacitor DVDT test device with multiple controllable currents according to claim 6, characterized in that: The upper temperature-sensing piece (843), the lower temperature-sensing piece (844), the external temperature-sensing strip (8411) and the internal temperature-sensing strip (8412) are all made of metal materials with a high thermal expansion coefficient. The thermal expansion coefficient of the lower temperature-sensing piece (844) is greater than the thermal expansion coefficient of the upper temperature-sensing piece (843), the thermal expansion coefficient of the external temperature-sensing strip (8411) is greater than the thermal expansion coefficient of the internal temperature-sensing strip (8412), and the thermal expansion coefficients of the upper temperature-sensing piece (843) and the lower temperature-sensing piece (844) are greater than the thermal expansion coefficients of the external temperature-sensing strip (8411) and the internal temperature-sensing strip (8412).

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