Withstand voltage test tool

Abstract

The utility model relates to a withstand voltage test tool, which comprises a working table, a pressing plate, a cylinder, a pedal plate, a withstand voltage tester, a test butt joint wire and a controller, the pressing plate is positioned at the upper part of the working table surface, the bottom surface of the pressing plate and the top surface of the working table are respectively provided with conductive sponges, and the pressing plate is driven by the cylinder to lift up and down. The controller comprises a main control MCU and relays electrically connected with the main control MCU, the relays comprise a first relay for controlling the air cylinder and a third relay for controlling the withstand voltage tester, and an output signal of the pedal is connected with the input end of the main control MCU; one end of the test pair wire is connected with the high-voltage output end of the withstand voltage tester, the other end of the test pair wire is provided with a plug-in interface used for being electrically connected with a tested product, and the grounding end of the withstand voltage tester is grounded and electrically connected with the conductive sponge on the pressing plate and the conductive sponge on the table board through grounding wires. And a power line of the withstand voltage tester is grounded and is connected with a normally closed contact of the third relay.

Description

Technical Field

[0001] This utility model relates to the field of pressure resistance testing technology, and specifically to a pressure resistance testing fixture. Background Technology

[0002] A withstand voltage test is a test of the insulation structure's ability to withstand voltage. It involves applying a high voltage to the insulation material of the product under test without damaging it. The withstand voltage test is used to verify whether the product's insulation performance meets safety standards. During the withstand voltage test, a voltage higher than the product's normal operating voltage is applied to the product under test and maintained for a period of time. If the insulation is very good, only a small leakage current will be generated; if the leakage current is large, it indicates poor insulation performance.

[0003] In existing technologies, a withstand voltage tester is typically used to perform withstand voltage tests on the product under test. The high-voltage output line of the withstand voltage tester is connected to the product under test, as are the grounding wires. The power cord of the withstand voltage tester also needs to be grounded. After completing the above wiring, the high-voltage output switch of the withstand voltage tester is manually pressed, and the tester will continuously output high voltage for a set time. This existing testing method is cumbersome, requiring manual operation for both wiring and triggering the high-voltage command. It is only suitable for random sampling tests in a laboratory setting and not for full inspection tests during production. Utility Model Content

[0004] This utility model discloses a pressure resistance testing fixture suitable for online full inspection, which is implemented using the following technical solution:

[0005] A withstand voltage testing fixture includes a workbench, a pressure plate, a cylinder, a foot pedal, a withstand voltage tester, a test connection cable, and a controller. The pressure plate is parallel to the workbench surface and located on the upper part of the workbench surface. Conductive sponges are respectively provided on the workbench surface and on the bottom surface of the pressure plate opposite to the workbench surface. The pressure plate is connected to the cylinder, which drives the pressure plate to move up and down. The controller includes a main control MCU and a relay electrically connected to the main control MCU. The relay includes a first relay for controlling the cylinder and a third relay for controlling the withstand voltage tester. The output signal of the foot pedal is connected to the input terminal of the main control MCU. One end of the test connection cable is connected to the high voltage output terminal of the withstand voltage tester, and the other end of the test connection cable is equipped with a plug-in interface for electrical connection with the product under test. The grounding terminal of the withstand voltage tester is grounded and electrically connected to the conductive sponges on the pressure plate and the workbench surface through a grounding wire. The power line of the withstand voltage tester is grounded and connected to the normally closed contact of the third relay.

[0006] Furthermore, guide rods are provided at both ends of the top of the pressure plate, and the pressure plate moves up and down along the guide rods.

[0007] Furthermore, the first relay is a single-pole single-throw relay, and the solenoid valve of the cylinder is electrically connected to the normally open contact of the first relay.

[0008] Furthermore, the model number of the first relay is G5NB-1A-E-DC12.

[0009] Furthermore, the third relay is a normally open intermediate relay, which includes at least two normally open contacts and two normally closed contacts. The two normally closed contacts of the third relay are short-circuited, and the test connection wire is connected to the normally open contacts of the third relay.

[0010] Furthermore, the model number of the third relay is G2R-2-DC12.

[0011] Furthermore, the withstand voltage test fixture also includes a power meter for testing power. The power meter is controlled by a second relay. The second relay is a normally open intermediate relay, which includes at least two normally open contacts and two normally closed contacts. The power meter is electrically connected to the test docking line, and the live wire and neutral wire of the test docking line are both connected to the normally closed contacts of the second relay.

[0012] Furthermore, the model number of the second relay is G2R-2-DC12.

[0013] The pressure resistance testing fixture designed in this invention is suitable for online full-inspection pressure resistance testing of heating wires in products such as heating pads. Simply place the product under test on the workbench, connect the connector on the product to the mating interface of the test cable, and input a signal to the controller by stepping on the foot pedal. The controller then moves the piston rod of the drive cylinder downwards until the pressure plate presses down on the product under test, causing the conductive sponge at the bottom of the pressure plate to contact the conductive sponge on the workbench. The pressure resistance tester then outputs high voltage to the product under test for the pressure resistance test. The entire testing process is simple to operate, highly safe, and requires no additional grounding connection to the product under test, thus meeting the requirements for online full-inspection testing of products.

[0014] In addition, the power meter can be connected to the control system of the aforementioned withstand voltage test fixture. Different relays can be used to switch between the power meter and the withstand voltage tester, so that different functional tests do not interfere with each other. The entire test process is automatically switched by the control system, eliminating the need for manual triggering of test commands in stages, thus improving the testing efficiency of online full inspection of products. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pressure resistance test fixture in the embodiment;

[0016] Figure 2 This is a block diagram illustrating the control principle of the withstand pressure test fixture in the embodiment.

[0017] Figure label:

[0018] 1. Workbench; 2. Pressure plate; 3. Foot pedal; 4. Conductive sponge; 5. Cylinder; 6. Guide rod; 7. Pressure tester; 8. Controller. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] This embodiment discloses a withstand voltage testing fixture. The product under test in this embodiment is a heating pad as an example. The heating pad contains a heating wire. The insulation layer of the heating wire and the fabric wrapping the heating wire both need to undergo insulation testing. Only products that meet the insulation requirements can be qualified for shipment. Therefore, the withstand voltage testing fixture in this embodiment is designed for power testing and withstand voltage testing of the heating pad.

[0021] The hardware structure of the complete withstand voltage testing fixture in this embodiment is as follows: Figure 1 As shown, it mainly includes a workbench, pressure plate 2, cylinder 5, foot pedal 3, pressure tester 7, test connection wire, controller 8, and power meter. Figure 1 (Not shown in the drawing). The workbench mainly consists of a support frame and a workbench surface 1. A pressure plate 2 that can move up and down is installed above the workbench surface 1. The pressure plate 2 is parallel to the workbench surface 1 to ensure that the product to be tested placed on the workbench surface 1 can be pressed down after the pressure plate 2 is pressed down. A layer of conductive sponge 4 is attached to the bottom surface of the pressure plate 2 and a layer of conductive sponge 4 is attached to the top surface of the workbench surface 1. The conductive sponge 4 is made of polymer composite material through foaming technology. It is conductive and has a certain degree of softness. It is very suitable for pressure resistance testing of flat products such as heating pads. After the pressure plate 2 is pressed down, the conductive sponge 4 on the pressure plate 2 can come into contact with the conductive sponge 4 on the workbench surface 1. A cylinder 5 is fixedly installed on the support frame. The piston rod of the cylinder 5 moves in a direction perpendicular to the pressure plate 2. The piston rod of the cylinder 5 is fixedly connected to the top of the pressure plate 2. The up and down lifting of the pressure plate 2 can be controlled by controlling the movement of the cylinder 5. To further achieve smooth up-and-down movement of the pressure plate 2, guide rods 6 are provided at both ends of the top of the pressure plate 2 in this embodiment, and guide sleeves are provided on the support frame at the positions corresponding to the guide rods 6, so that the guide rods 6 are placed in the guide sleeves.

[0022] In addition to the aforementioned hardware structure, signal control is also combined with... Figure 2The following description is provided. A withstand voltage tester 7, a controller 8, and a power meter are placed on the support frame of the workbench. A foot pedal 3 is installed under the workbench surface 1. The controller 8 is used to control the operation of the cylinder 5, control the power meter to perform power testing on the product under test, and control the withstand voltage tester 7 to output high voltage to perform withstand voltage testing on the product under test. Therefore, the core components of the controller 8 in this embodiment include a main control MCU and relays, connecting the signal output terminal of the foot pedal 3 to the signal input terminal of the main control MCU. The relays are divided into a first relay (corresponding to...) Figure 2 Relay 1), second relay (corresponding to) Figure 2 Relay 2) and the third relay (corresponding to Figure 2 The three relays (relay 3) are connected to the output terminal of the main control MCU respectively. The first relay is used to control the action of the cylinder 5, the second relay is used to control the power meter to complete the test, and the third relay is used to control the withstand voltage tester 7 to complete the test.

[0023] As described above, the first relay in this embodiment is a single-pole single-throw relay, which has one normally open contact and one normally closed contact. The solenoid valve controlling the operation of cylinder 5 is electrically connected to the normally open contact of the first relay. For example, a relay of model G5NB-1A-E-DC12 can be used as the first relay. The second and third relays in this embodiment are both normally open intermediate relays, which have multiple normally open contacts and multiple normally closed contacts. In this embodiment, model G2R-2-DC12 is used as the second and third relays, which has two normally open contacts and two normally closed contacts.

[0024] The withstand voltage tester 7 typically has a high-voltage output terminal and a grounding terminal. A test connection wire is used to connect the high-voltage output terminal of the withstand voltage tester 7 to the test product under test. One end of the test connection wire is electrically connected to the high-voltage output terminal of the withstand voltage tester 7. To facilitate connection between the test connection wire and the test product, a mating connector is installed at the other end of the test connection wire. The test terminal of the test product usually has a connector; when testing is required, the mating connector is simply plugged into the connector. During wiring, the grounding terminal of the withstand voltage tester 7 is grounded. The grounding terminal is connected to the conductive sponge 4 on the pressure plate 2 and the conductive sponge 4 on the worktable 1 via a grounding wire. The two normally closed contacts of the third relay are short-circuited and grounded. The live and neutral wires of the test connection wire are connected to the normally open contacts of the third relay. The power supply wire of the withstand voltage tester 7 is connected to the normally closed contacts of the third relay and grounded. The power meter is also electrically connected to the test dock. Power testing and withstand voltage testing can be achieved by switching control signals. When wiring, connect both the live wire and the neutral wire of the test dock to the normally closed contact of the second relay.

[0025] Assemble the withstand voltage test fixture according to the structure and wiring method given above. The process of performing power and withstand voltage tests on the product under test is described as follows: First, place the product under test flat on the conductive sponge 4 on the workbench 1. Then, connect the connector on the product under test to the mating interface on the test mating line. Since the power meter is controlled by the normally closed contact of the second relay, and the high voltage output terminal of the withstand voltage tester 7 is connected to the normally open contact of the third relay through the test mating line, the withstand voltage tester 7 will not output high voltage before the foot pedal 3 receives a signal. Once the product under test is connected to power, the system automatically performs a power test on the product under test first. The power test result verifies whether the product under test is good. Only after the power test is completed will the withstand voltage test be performed. If the power test fails, it proves that the product under test has a quality defect, and there is no need to continue the subsequent withstand voltage test. After the power test is completed, stepping on the foot pedal 3 inputs a control signal to the main control MCU of the controller 8. At this time, the first relay closes, and the cylinder 5 drives the pressure plate 2 to descend until the conductive sponge 4 on the pressure plate 2 contacts the conductive sponge 4 on the workbench 1. Simultaneously, the second relay switches from its normally closed contact to its normally open contact, disconnecting the power meter's test path. The third relay switches from its normally open contact to its normally closed contact, allowing the withstand voltage tester 7 to output high voltage to the product under test for withstand voltage testing. The third relay remains in its normally closed contact for 3 seconds, subjecting the product under test to a continuous 3KV high voltage for 3 seconds. The leakage current value on the withstand voltage tester 7 is observed. If the leakage current exceeds the specified set value, the withstand voltage tester 7 will issue an alarm signal indicating that the product under test has failed the withstand voltage test. After the withstand voltage test lasts for 3 seconds, the third relay switches back to its normally open contact connection, and the second relay automatically resets and switches back to its normally closed contact connection. This completes the power and withstand voltage test of one product under test.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure resistance testing fixture, characterized in that: The system includes a workbench, a pressure plate, a cylinder, a foot pedal, a withstand voltage tester, test connection wires, and a controller. The pressure plate is parallel to the workbench surface and located on the upper part of the workbench surface. Conductive sponges are provided on the workbench surface and on the bottom surface of the pressure plate opposite to the workbench surface. The pressure plate is connected to the cylinder, which drives the pressure plate to move up and down. The controller includes a main control MCU and relays electrically connected to the main control MCU. The relays include a first relay for controlling the cylinder and a third relay for controlling the withstand voltage tester. The output signal of the foot pedal is connected to the input terminal of the main control MCU. One end of the test connection wire is connected to the high-voltage output terminal of the withstand voltage tester, and the other end of the test connection wire is equipped with a plug-in interface for electrical connection with the product under test. The grounding terminal of the withstand voltage tester is grounded and electrically connected to the conductive sponges on the pressure plate and the workbench surface through a grounding wire. The power cord of the withstand voltage tester is grounded and connected to the normally closed contact of the third relay.

2. The pressure resistance testing fixture according to claim 1, characterized in that: The pressure plate is provided with guide rods at both ends of its top, and the pressure plate moves up and down along the guide rods.

3. The pressure resistance testing fixture according to claim 1, characterized in that: The first relay is a single-pole single-throw relay, and the solenoid valve of the cylinder is electrically connected to the normally open contact of the first relay.

4. The pressure resistance testing fixture according to claim 3, characterized in that: The model number of the first relay is G5NB-1A-E-DC12.

5. The pressure resistance testing fixture according to claim 1, characterized in that: The third relay is a normally open intermediate relay, which includes at least two normally open contacts and two normally closed contacts. The two normally closed contacts of the third relay are short-circuited, and the test connection wire is connected to the normally open contacts of the third relay.

6. The pressure resistance testing fixture according to claim 5, characterized in that: The third relay is model G2R-2-DC12.

7. The pressure resistance testing fixture according to claim 1, characterized in that: The withstand voltage test fixture also includes a power meter for testing power. The power meter is controlled by a second relay. The second relay is a normally open intermediate relay. The second relay includes at least two normally open contacts and two normally closed contacts. The power meter is electrically connected to the test docking line. The live wire and neutral wire of the test docking line are both connected to the normally closed contacts of the second relay.

8. The pressure resistance testing fixture according to claim 7, characterized in that: The model number of the second relay is G2R-2-DC12.

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