Temperature-sensitive withstand voltage testing device for PTC (Positive Temperature Coefficient)

Abstract

The utility model discloses a PTC thermosensitive withstand voltage test device, and specifically relates to the PTC thermistor test technology field, the PTC thermosensitive withstand voltage test device comprises a box body, a clamping test device and a transformer, the clamping test device and the transformer are arranged in the box body, a guide hole is internally provided with a sliding rod in a sliding manner, and the guide hole is internally provided with a compound spring. The head end and the tail end of the compound spring are fixedly installed between the sliding rod and the inner end wall of the guide hole. An insulating plate is fixedly installed at the end, away from the compound spring, of the sliding rod. According to the PTC thermosensitive withstand voltage test device, the clamping test device is arranged to carry out a clamping test on a plurality of thermistors, in the actual use process, the thermistors are placed between the insulating plate and the conductive plate, and the compound spring pushes the insulating plate to clamp the positive and negative electrodes of the thermistors between the conductive plate and the insulating plate, so that the thermistors are clamped between the conductive plate and the insulating plate. The two current-conducting plates are electrically connected with the transformer through wires, and the voltage of the transformer is controlled through the PLC control panel, so that voltage testing is carried out on the plurality of thermistors.

Description

Technical Field

[0001] The utility model relates to the technical field of PTC thermistor testing, in particular to a PTC thermistor withstand voltage testing device. Background Art

[0002] The purpose of the withstand voltage test on PTC thermistors is to check their insulation performance and bearing capacity under certain voltage conditions. When conducting the withstand voltage test, a specified high voltage is usually applied to the two poles of the PTC thermistor for a period of time. If the resistor does not show abnormal phenomena such as breakdown or leakage during the test, it indicates that its withstand voltage performance meets the requirements.

[0003] Most of the existing PTC thermistor withstand voltage test devices are powered on by a multimeter (multi-purpose meter) for testing. Only a single resistor can be tested each time during the test, which is very inconvenient. At the same time, the resistor may be broken down by the voltage during the test, causing damage to the tester and the instrument.

[0004] In view of this, we propose a PTC thermistor withstand voltage test device to solve the above problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a PTC thermistor withstand voltage test device, which can effectively solve the above-mentioned problems.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A PTC thermal-sensitive withstand voltage test device comprises a box body, a clamping test device and a transformer arranged in the box body,

[0008] The clamping test device comprises a test plate, the top of the test plate is symmetrically provided with slots away from the axis, a conductive plate is installed in one side of the slot along the length direction, the two conductive plates are electrically connected to the transformer through wires, and guide holes are equidistantly provided in one side of the slot away from the conductive plate;

[0009] A slide rod is slidably installed in the guide hole, a recoil spring is arranged in the guide hole, and the first and second ends of the recoil spring are respectively fixedly installed between the slide rod and the inner end wall of the guide hole;

[0010] An insulating plate is fixedly mounted on one end of the sliding rod away from the recoil spring.

[0011] Preferably, a through limiting hole is provided at the axis center of the top of the test board, a fixing block is installed in the box body at the lower part of the test board, a communicating hole is provided at the top of the fixing block, and a limiting groove is fixedly installed at the upper end of the communicating hole;

[0012] A connecting rod is movably installed in the limiting hole, and a connecting block is fixedly installed on one end of the connecting rod extending into the communicating hole. Limiting blocks adapted to the limiting groove are symmetrically installed on the outer surface of the connecting block.

[0013] Preferably, a handle is provided at the axis center of the top end of the test plate, and one end of the connecting rod extending out of the limiting hole is fixedly connected to the handle.

[0014] Preferably, a PLC control panel is fixedly installed on the top of the box body, and the PLC control panel is electrically connected to the transformer.

[0015] Preferably, a transparent plastic steel cover is hingedly mounted on the box body at the upper portion of the clamping test device.

[0016] Preferably, a pull handle is fixedly mounted on the end surfaces of the plurality of insulating plates that are away from each other, and the pull handle is L-shaped.

[0017] Preferably, an external power cord is provided at one end of the transformer away from the clamping test device, and a connecting end of the external power cord extends out of the box body.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. In the utility model, a clamping test device is provided to perform clamping test on multiple thermistors. In actual use, the thermistor is placed between an insulating plate and a conductive plate. The return spring pushes the insulating plate to clamp the positive and negative poles of the thermistor between the conductive plate and the insulating plate. Both conductive plates are electrically connected to the transformer through wires. The voltage of the transformer is controlled by a PLC control panel, thereby performing voltage test on multiple thermistors.

[0020] 2. In the utility model, a clamping test device is installed in the box body to prevent the thermistor from flashing and exploding during the test, which may cause injury to the tester. At the same time, a transparent plastic-steel cover hingedly installed on the box body allows the user to more intuitively observe whether the thermistor on the clamping test device is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the box body in the utility model;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the clamping test device in the utility model;

[0024] Figure 4This is a schematic diagram of the connection structure between the sliding rod and the insulating plate in the utility model;

[0025] Figure 5 It is a schematic diagram of the cross-sectional split structure of the handle and the fixing block in the utility model.

[0026] In the figure: 1. box body; 2. transparent plastic steel cover; 3. clamping test device; 31. test plate; 32. slot; 33. conductive plate; 331. wire; 34. guide hole; 35. slide bar; 36. return spring; 37. insulating plate; 38. pull handle; 39. limit hole; 5. PLC control panel; 6. transformer; 61. external power cord; 7. fixing block; 71. connecting hole; 72. limit slot; 8. handle; 81. connecting rod; 82. connecting block; 821. limit block. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0028] like Figure 1 - Figure 5 As shown, a device for testing the PTC thermistor withstand voltage comprises a box body 1, a clamping test device 3 and a transformer 6 arranged in the box body 1, the clamping test device 3 comprises a test plate 31, a top of the test plate 31 is symmetrically provided with a slot 32 away from the starting axis, a conductive plate 33 is installed on one side along the length direction of the slot 32, and the two conductive plates 33 are electrically connected to the transformer 6 through wires 331 respectively, and guide holes 34 are equidistantly provided on one side of the slot 32 away from the conductive plate 33, a slide rod 35 is slidably installed in the guide hole 34, a return spring 36 is arranged in the guide hole 34, the head and tail ends of the return spring 36 are respectively fixedly installed between the slide rod 35 and the inner end wall of the guide hole 34, and an insulating plate 37 is fixedly installed on one end of the slide rod 35 away from the return spring 36;

[0029] In actual use, the thermistor is placed between the insulating plate 37 and the conductive plate 33. The return spring 36 pushes the insulating plate 37 to clamp the positive and negative poles of the thermistor between the conductive plate 33 and the insulating plate 37. Both conductive plates 33 are electrically connected to the transformer 6 through the wire 331. The voltage of the transformer 6 is controlled by the PLC control panel 5, so as to perform voltage tests on multiple thermistors.

[0030] Further, a through limiting hole 39 is provided at the axis center of the top of the test board 31, a fixing block 7 is installed at the lower part of the test board 31 in the box body 1, a connecting hole 71 is provided at the top of the fixing block 7, a limiting groove 72 is fixedly installed at the upper end of the connecting hole 71, a connecting rod 81 is movably installed in the limiting hole 39, a connecting block 82 is fixedly installed at one end of the connecting rod 81 extending into the connecting hole 71, and a limiting block 821 adapted to the limiting groove 72 is symmetrically installed on the outer surface of the connecting block 82;

[0031] When placing the test board 31 into the box body 1, align the limiting hole 39 with the fixing block 7, so that the test board 31 is smoothly placed into the box body 1, and the connecting rod 81 is turned to make the two limiting blocks 821 on the connecting block 82 engage with the limiting groove 72, so that the test board 31 is limited in the box body 1. Conversely, the connecting rod 81 is turned to release the limiting blocks 821 and the limiting groove 72, so that the test board 31 is taken out of the box body 1.

[0032] Furthermore, a handle 8 is provided at the axis center of the top of the test board 31, and one end of the connecting rod 81 extending out of the limiting hole 39 is fixedly connected to the handle 8;

[0033] The handle 8 is provided to facilitate the user to take out the clamping test device 3 . In actual use, the user can rotate the handle 8 to drive the limiting block 821 and the limiting groove 72 to limit the position.

[0034] Furthermore, a PLC control panel 5 is fixedly mounted on the top of the box body 1, and the PLC control panel 5 is electrically connected to the transformer 6;

[0035] The on and off of the transformer 6 can be controlled by setting a PLC control panel 5 , and the voltage value of the voltage output of the transformer 6 can be controlled at the same time, so that the user can control the transformer 6 conveniently.

[0036] Furthermore, a transparent plastic steel cover 2 is hingedly mounted on the box body 1 at the upper portion of the clamping test device 3;

[0037] The box body 1 is provided to prevent the tester from being injured due to flash explosion of the thermistor during the test. At the same time, the transparent plastic steel cover 2 hingedly installed on the box body 1 allows the user to more intuitively observe whether the thermistor on the clamping test device 3 is damaged.

[0038] Furthermore, a pull handle 38 is fixedly mounted on the end surfaces of the plurality of insulating plates 37 that are away from each other, and the pull handle 38 is L-shaped;

[0039] By providing a pull handle 38 fixedly mounted on the insulating plate 37 , the user can pull the slide bar 35 through the pull handle 38 during actual use, thereby preventing the risk of electric shock caused by contact between the limbs and the conductive plate 33 when pushing the slide bar 35 .

[0040] Furthermore, an external power line 61 is provided at one end of the transformer 6 away from the clamping test device 3, and a connection end of the external power line 61 extends out of the box body 1;

[0041] The transformer 6 can be electrically connected to an external power source by providing an external power line 61 .

[0042] It should be noted that the specific installation method of the PLC control panel 5 and the transformer 6, the circuit connection method and the control method used in the present invention are all conventional designs, and the present invention will not elaborate on them in detail.

[0043] The working principle of the utility model is as follows: pull the handle 38 to make the insulating plate 37 on the slide bar 35 away from the conductive plate 33, place the thermistor between the conductive plate 33 and the insulating plate 37, release the handle 38, and the return spring 36 pushes the slide bar 35, so that the positive and negative motors on the thermistor are clamped between the conductive plate 33 and the insulating plate 37, and the two conductive plates 33 are electrically connected to the transformer 6 through the wire 331, and the voltage of the transformer 6 is controlled by the PLC control panel 5, so as to perform voltage testing on multiple thermistors.

[0044] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A device for testing a PTC thermal-sensitive withstand voltage, comprising a box body (1), a clamping test device (3) and a transformer (6) arranged in the box body (1), characterized in that: The clamping test device (3) comprises a test plate (31), the top of the test plate (31) is symmetrically provided with a slot (32) away from the axis, a conductive plate (33) is installed in one side of the slot (32) along its length direction, the two conductive plates (33) are electrically connected to the transformer (6) through wires (331), and guide holes (34) are equidistantly provided in one side of the slot (32) away from the conductive plate (33); A slide rod (35) is slidably installed in the guide hole (34), a recoil spring (36) is arranged in the guide hole (34), and the head and tail ends of the recoil spring (36) are respectively fixedly installed between the slide rod (35) and the inner end wall of the guide hole (34); An insulating plate (37) is fixedly mounted on one end of the sliding rod (35) away from the return spring (36).

2. A PTC thermistor withstand voltage test device according to claim 1, characterized in that: A through-going limiting hole (39) is provided at the axis center of the top end of the test plate (31); a fixing block (7) is installed in the box body (1) at the lower part of the test plate (31); a communicating hole (71) is provided at the top end of the fixing block (7); and a limiting groove (72) is fixedly installed at the upper end of the communicating hole (71); A connecting rod (81) is movably installed in the limiting hole (39), and a connecting block (82) is fixedly installed on one end of the connecting rod (81) extending into the communicating hole (71), and a limiting block (821) adapted to the limiting groove (72) is symmetrically installed on the outer surface of the connecting block (82).

3. A PTC thermistor withstand voltage test device according to claim 2, characterized in that: A handle (8) is provided at the axis center of the top end of the test plate (31), and one end of the connecting rod (81) extending out of the limiting hole (39) is fixedly connected to the handle (8).

4. A PTC thermistor withstand voltage test device according to claim 1, characterized in that: A PLC control panel (5) is fixedly mounted on the top of the box body (1), and the PLC control panel (5) is electrically connected to the transformer (6).

5. The device for testing the PTC thermal-sensitive withstand voltage according to claim 1, characterized in that: A transparent plastic steel cover (2) is hingedly mounted on the box body (1) at the upper portion of the clamping test device (3).

6. The device for testing the PTC thermistor withstand voltage according to claim 1, characterized in that: A pull handle (38) is fixedly mounted on the end surfaces of the plurality of insulating plates (37) that are away from each other, and the pull handle (38) is L-shaped.

7. The device for testing the PTC thermistor withstand voltage according to claim 1, characterized in that: An external power line (61) is provided at one end of the transformer (6) away from the clamping test device (3), and a connection end of the external power line (61) extends out of the box body (1).

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