Adjustable test fixture for withstand voltage tester

Abstract

The utility model relates to test fixture technical field, concretely is adjustable test fixture for pressure tester, including pressure test stand, fixture platform and clamping mechanism, fixture platform is located pressure test stand top, both ends extend circuit hole plate and open test circuit hole to fix wire, clamping mechanism passes through single cylinder drive linkage device, and the synchronous control upper pressing plate longitudinal pressure holds and side clamping plate horizontal clamping, fixed column passes through screw rod and internal thread hole adjustment horizontal position to adapt to different width measured equipment. This fixture realizes quick positioning and release, and promotes test security and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of test fixture technology, specifically an adjustable test fixture for a pressure resistance tester. Background Technology

[0002] A withstand voltage tester is an important safety testing instrument used to verify the insulation performance of electrical equipment, components, wires, household appliances, and other products. It applies a "high voltage" far exceeding the rated operating voltage between the live parts and the casing (or grounded parts) of the tested equipment, maintains it for a specified time, and then monitors the magnitude of the "leakage current" flowing through the insulating material.

[0003] The test modes include: AC withstand voltage test: the most commonly used test mode. It simulates the actual operating conditions of mains power and can simultaneously assess the withstand voltage strength and dielectric loss of the insulation. During the test, due to the presence of capacitive load, the total leakage current will be relatively large.

[0004] DC withstand voltage test: A high DC voltage is applied. Its advantage is that after charging, the leakage current is only the actual conducted leakage current (no capacitive current), making it easier to detect concentrated defects such as insulation gaps. The device under test needs to be discharged after the test. It is commonly used for products with large capacitive loads, such as capacitors, cables, and large power equipment.

[0005] Before testing the device under test, a specialized test fixture is required to fix it in place. A well-designed and correctly used fixture not only ensures the accuracy and repeatability of the test results but also serves as the first line of defense for the safety of operators. Analysis of most existing test fixtures reveals that they often suffer from insufficient clamping stability or complex operation during manipulation and clamping. For example, using manual rotation of the bolt for clamping and positioning results in slow movement and positioning speed. To address this, this technical solution designs an adjustable test fixture for a withstand voltage tester. Utility Model Content

[0006] The purpose of this invention is to provide an adjustable test fixture for a pressure resistance tester to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: An adjustable test fixture for a withstand voltage tester includes a withstand voltage test frame, a withstand voltage tester, and a fixture platform. The withstand voltage test frame is configured as a side-mounted L-shaped structure, and the fixture platform is located on the top side of the withstand voltage test frame. The withstand voltage tester is installed inside the withstand voltage test frame below the fixture platform. The device to be tested is placed on the fixture platform. Circuit board plates extend outward from both ends of the fixture platform. Multiple test circuit holes are provided on the circuit board. The withstand voltage tester and the device under test are connected through the connection of the test circuit holes via test wires. The test circuit holes are designed to restrain the connecting wires within a certain range to prevent them from moving freely and causing danger. A set of clamping mechanisms is provided on the pressure resistance test frame on one side of the fixture platform. The clamping mechanisms are used to press the top and side walls of the pressure resistance test equipment placed on the fixture platform. At the same time, two sets of fixing columns are provided on the top of the fixture platform away from the clamping mechanisms. The fixing columns cooperate with the side-pressing components of the fixture platform to horizontally position the test equipment placed on the fixture platform. The fixture platform is designed as an integrated structure and is controlled by a cylinder. It can simultaneously control the top and side movements to clamp and fix the test equipment in two directions. The fixed column and the fixture table are detachably connected and can be adjusted within a certain distance in the horizontal direction to facilitate horizontal clamping of test equipment of different widths.

[0008] In this embodiment of the invention, a screw is installed at the bottom of the fixed column, and multiple equally spaced internal threaded holes are opened on the clamping table corresponding to the bottom of the screw along the horizontal direction. The horizontal position of the fixed column is adjusted by the threaded connection between the screw and the internal threaded holes, so as to cooperate with the clamping mechanism to accurately position the measured equipment of different widths. A connecting block is connected to the bottom of the cylinder, and a U-shaped swing frame V fixed on the pressure resistance test frame is connected to the bottom of the connecting block through a swing shaft. A piston rod is connected to the top output end of the cylinder, and the end of the piston rod is connected to the clamping mechanism.

[0009] Compared with the prior art, the beneficial effects of this utility model are: by using a single cylinder to drive the linkage mechanism, the longitudinal pressing of the upper pressure plate and the horizontal clamping of the side clamping plate are controlled synchronously, thereby improving the operating efficiency.

[0010] The horizontal distance can be infinitely adjusted by using a fixed column and a screw to engage with multiple internal threaded holes, making it suitable for equipment of different sizes. The high-voltage conductor is secured by the test line hole to prevent the risk of displacement. Insulating buffer pads are installed on the inner side of the upper pressure plate and side clamps to avoid equipment damage and the risk of electric arc. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an adjustable test fixture for a pressure resistance tester.

[0012] Figure 2 This is a schematic diagram of the adjustable test fixture for a pressure resistance tester from a second perspective.

[0013] Figure 3 This is a schematic diagram of the front view structure of an adjustable test fixture for a pressure resistance tester.

[0014] Figure 4 for Figure 1 A magnified structural diagram of A in the diagram.

[0015] The components include: a withstand voltage test frame 10, a withstand voltage tester 11, a fixture table 12, a clamping mechanism 13, an upper pressure plate 14, a side clamping plate 15, a fixing column 16, an internal threaded hole 17, a circuit hole plate 18, a test circuit hole 19, a cylinder 20, an upper pressure plate swing connecting plate 21, a connecting rod I 22, a U-shaped swing frame I 23, a connecting rod II 24, a U-shaped swing frame II 25, a sleeve 26, a fixing column 27, a sleeve spring 28, a U-shaped swing frame III 29, an end plate 30, a U-shaped swing frame IV 31, a U-shaped swing frame V 32, a connecting column 33, an L-shaped connecting rod 34, and a U-shaped swing frame VI 35. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Please see Figures 1-4 An adjustable test fixture for a withstand voltage tester includes a withstand voltage test frame 10, a withstand voltage tester 11, and a fixture platform 12. The withstand voltage test frame 10 is configured as a side-mounted L-shaped structure. The fixture platform 12 is located on the top side of the withstand voltage test frame 10. The withstand voltage tester 11 is installed inside the withstand voltage test frame 10 below the fixture platform 12. The device to be tested is placed on the fixture platform 12. Circuit hole plates 18 extend outward from both ends of the fixture platform 12. Multiple test circuit holes 19 are provided on the circuit hole plates 18. The withstand voltage tester 11 and the device under test are connected through the connection of the test circuit holes 19 via test wires. The test circuit holes 19 are designed to restrain the connecting wires within a certain range to prevent them from moving randomly and causing danger. A set of clamping mechanisms 13 is provided on the pressure resistance test frame 10 on one side of the fixture platform 12. The clamping mechanisms 13 are used to press the top and side walls of the pressure resistance test equipment placed on the fixture platform 12. At the same time, two sets of fixing columns 16 are provided on the top of the fixture platform 12 away from the clamping mechanisms 13. The fixing columns 16 cooperate with the components that press the fixture platform 12 laterally to horizontally position the test equipment placed on the fixture platform 12. The fixture table 12 is an integrated structure and is controlled by a cylinder 20. It can simultaneously control the top and side movements to clamp and fix the test equipment in two directions. The fixed column 16 is detachably connected to the fixture table 12, and can be adjusted within a certain distance in the horizontal direction to facilitate horizontal clamping of test equipment of different widths.

[0021] In this embodiment of the invention, a screw is installed at the bottom of the fixed column 16, and a plurality of equally spaced internal threaded holes 17 are opened on the clamping table 12 corresponding to the bottom of the screw in the horizontal direction. The threaded connection between the screw and the internal threaded holes 17 is used to adjust the horizontal position of the fixed column 16, thereby cooperating with the clamping mechanism 13 to accurately position the measured equipment of different widths. A connecting block is connected to the bottom of the cylinder 20. The bottom end of the connecting block is connected to a U-shaped swing frame V32 fixed on the pressure test frame 10 via a swing shaft. A piston rod is connected to the top output end of the cylinder 20. The end of the piston rod is connected to the clamping mechanism 13. The clamping mechanism 13 includes a U-shaped swing frame Ⅲ 29 connected to the end of the piston rod. A sleeve 26 is connected to the inner side of the opening of the U-shaped swing frame Ⅲ 29 via two sets of swing rods. The ends of the two sets of swing rods are rotatably connected to an upwardly inclined U-shaped swing frame Ⅱ 25. A fixing post 27 is inserted into the middle of the sleeve 26. A set of end plates 30 with a diameter larger than the fixing post 27 is installed at the top of the fixing post 27. A spring 28 is fitted onto the fixing post 27 between the sleeve 26 and the end plates 30. A connecting block is installed at the bottom of the fixing post 27 via a connecting post 33. The bottom of the connecting block is connected via a rotating... A set of U-shaped swing frames VI 35 fixed on the pressure resistance test frame 10 is rotatably connected to the rotating shaft. An L-shaped connecting rod 34 is installed on the side of the connecting column 33 facing the fixture table 12. A side clamping plate 15 is installed on the side wall of the L-shaped connecting rod 34 facing the fixture table 12. When the cylinder 20 controls the piston rod to extend and retract, it controls the connecting block at the bottom of the connecting column 33 to swing in the U-shaped swing frame V 32, thereby controlling the side clamping plate 15 to swing left and right, adjusting its lateral squeezing force with the device under test on the fixture table 12, so that it cooperates with the fixed column 16 to clamp in the horizontal direction. A connecting block is installed on the top of the end plate 30. The connecting block is connected to a U-shaped swing frame IV 31 via a swing shaft. A set of rectangular upper pressure plate swing connecting plates 21 is provided on the top of the U-shaped swing frame IV 31. A rectangular slot is opened on the inner side of the upper pressure plate swing connecting plate 21 corresponding to the position of the U-shaped swing frame IV 31. The top of the U-shaped swing frame IV 31 is rotatably connected to the rectangular slot via the connecting block and the swing shaft. At the same time, a connecting rod II 24 is connected to the middle of the top side wall of the U-shaped swing frame II 25. The top of the connecting rod II 24 is connected to the U-shaped swing frame I 23 via a swing shaft. The middle of the side wall of the U-shaped swing frame I 23 is connected to the connecting rod II 24 via a swing shaft. Rod I 22 is connected to the upper pressure plate swing connecting plate 21. At the same time, an upper pressure plate 14 is installed on the lower side of the end of the upper pressure plate swing connecting plate 21 away from the connecting rod I 22. That is, when the cylinder 20 controls the piston rod to extend and retract, it pushes the sleeve 26 to slide on the fixed column 27, and then drives the swing angle between the connecting rod I 22 and the connecting rod II 24 to be adjusted. At the same time, under the rotational connection between the top of the U-shaped swing frame IV 31 and the upper pressure plate swing connecting plate 21, the upper pressure plate 14 at the end of the upper pressure plate swing connecting plate 21 is controlled to swing up and down, and the measured equipment placed on the fixture table 12 is longitudinally pressed and positioned. Under the control of cylinder 20, the upper pressure plate 14 and the side clamping plate 15 are simultaneously controlled to quickly position and release the device under test placed on the fixture table 12.

[0022] In one embodiment of the present invention, the test leads between the withstand voltage tester 11 and the device under test are generally dedicated high-voltage test leads, which have high insulation strength, shielding and other characteristics. The connection terminals are generally standard BNC or dedicated high-voltage connectors. During the withstand voltage test, the withstand voltage tester 11 generates a user-defined AC or DC high voltage through a high-voltage transformer and voltage regulator. The high voltage is applied to the device under test through the high-voltage line. At the same time, the withstand voltage tester 11 accurately monitors the leakage current flowing from the high-voltage end through the insulation material of the DUT and finally to the ground circuit. The user then presets an upper limit value for the leakage current, such as 1mA or 5mA.

[0023] Pass: If the actual measured leakage current is consistently lower than this upper limit value throughout the entire test period, it indicates that the insulation performance is good and can withstand the high voltage, and is judged as passing.

[0024] Failure: If the leakage current increases sharply (breakdown) or exceeds the set upper limit, it indicates that there is a defect in the insulation, such as insufficient spacing, impurities, or cracks. The withstand voltage tester 11 will immediately cut off the high voltage and alarm, and judge it as a failure.

[0025] The device under test typically refers to any electrical or electronic product, component, or material whose electrical safety needs to be verified.

[0026] In a preferred embodiment of the present invention, an insulating buffer pad is provided on the side of the upper pressure plate 14 and the side clamping plate 15 that contacts the device under test, in order to reduce the contact pressure on the device under test and to provide safety protection.

[0027] The working principle of this utility model is as follows: In the idle position of this device, all the aforementioned driving components (representing power elements, electrical devices, and compatible power supplies) are connected via wires. The electrical connections are completed in sequence between the working components. The detailed connection methods are well-known in the field. The following mainly describes the working principle and process, without further explanation of the electrical control. The device under test is placed on the fixture table 12. The test lead passes through the test line hole 19 and connects to the withstand voltage tester 11. The screw at the bottom of the fixed column 16 is rotated and the matching internal thread hole 17 is selected for fixing. The distance between the device and the side clamp (15) is adjusted to match the width of the device. The piston rod of the cylinder 20 extends and pushes the U-shaped swing frame Ⅲ 29, which drives the sleeve 26 to slide along the fixed column 27 and compress the sleeve spring 28. The movement of the sleeve 26 drives the U-shaped swing frame Ⅰ 23 through the connecting rod Ⅱ 24. The upper pressure plate swings the connecting plate 21 through the connecting rod Ⅰ 22. The upper pressure plate 14 presses down on the top of the device. The movement of the sleeve 26 pushes the side clamp 15 to move towards the side wall of the device through the L-shaped connecting rod 34, forming a clamp with the fixed column 16.

[0028] Test execution: Apply high voltage to withstand voltage tester 11 and monitor leakage current.

[0029] Release and reset: The piston rod of cylinder 20 retracts, the corresponding structure moves in the opposite direction, the upper pressure plate 14 is lifted, the side clamping plate 15 is retracted, and the equipment is taken out.

[0030] It should be understood that in this application, all rotating, sliding, meshing, belt-driven and other moving parts are well lubricated and not prone to slippage or wear, and each part is provided with a corresponding protective shell. However, in the accompanying drawings of this application, the connection state of each moving part is not shown. It should also be understood that all parts in this application are made of metal or plastic materials with suitable strength in the relevant field to ensure that their structural rigidity meets the actual requirements.

[0031] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An adjustable test fixture for a withstand voltage tester, comprising a withstand voltage test frame (10) and a fixture table (12), characterized in that, The fixture platform (12) is located on the top of the withstand voltage test frame (10), and its two ends extend into circuit hole plates (18), which have multiple test circuit holes (19). The clamping table (12) is provided with a clamping mechanism (13) on one side, including a cylinder (20), a linkage assembly, an upper pressure plate (14) and a side clamping plate (15); The output end of the cylinder (20) is connected to the U-shaped swing frame III (29), the U-shaped swing frame III (29) is connected to the sleeve (26) through the swing rod, the sleeve (26) is sleeved on the fixed column (27) and provided with a sleeve spring (28); The fixed column (27) is hinged to the U-shaped swing frame VI (35) via the connecting column (33), and the connecting column (33) is fixed to the L-shaped connecting rod (34) and the side clamping plate (15); The sleeve (26) is hinged to the U-shaped swing frame II (25), and drives the U-shaped swing frame I (23) via the connecting rod II (24), and then controls the upper pressure plate to swing the connecting plate (21) and the upper pressure plate (14) via the connecting rod I (22); An adjustable fixing post (16) is provided on the other side of the fixture table (12), and the fixing post (16) is provided with a screw that engages with multiple internal threaded holes (17) on the fixture table (12).

2. The adjustable test fixture for a withstand voltage tester according to claim 1, characterized in that, The screw of the fixed column (16) and the internal threaded hole (17) form a horizontal adjustment structure, and the internal threaded hole (17) is equidistantly distributed along the horizontal direction of the fixture table (12).

3. The adjustable test fixture for a withstand voltage tester according to claim 1, characterized in that, The spring (28) is sleeved on the fixed post (27), and its two ends are respectively abutted against the sleeve (26) and the end plate (30).

4. The adjustable test fixture for a withstand voltage tester according to claim 1, characterized in that, Insulating buffer pads are provided on the inner sides of the upper pressure plate (14) and the side clamping plate (15).

5. The adjustable test fixture for a withstand voltage tester according to claim 1, characterized in that, The line hole plate (18) and the fixture table (12) are integrally formed, and the diameter of the test line hole (19) is 1.5-2 times larger than the diameter of the high voltage conductor.

6. The adjustable test fixture for a withstand voltage tester according to claim 3, characterized in that, The end plate (30) is equipped with a connecting block at the top, and the connecting block is connected to a U-shaped swing frame IV (31) via a swing shaft. The bottom of the cylinder (20) is hinged to a U-shaped swing frame V (32), and the top piston rod is hinged to a U-shaped swing frame III (29). The top of the U-shaped swing frame IV (31) is hinged to an upper pressure plate swing connecting plate (21).

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