Withstand voltage tester with protection function

Abstract

The invention discloses a withstand voltage tester with a protection function, and belongs to the technical field of withstand voltage testers. When the withstand voltage tester leaks electricity, after an electromagnet is powered off, no magnetic force is generated between a magnetic attraction block and the electromagnet, and the elastic support of a second spring can drive a pull plate to move; the pull plate drives the clamping block to horizontally move and is separated from the clamping groove in the electroprobe connecting seat, the electroprobe connecting seat is in a free moving state in the terminal sleeve, and then the first spring drives the piston ring to move in the cavity of the fixing ring through the elastic support of the first spring in the fixing ring; the piston ring drives the pressing ring to move outwards and extrudes the connecting plug on the electroprobe connecting seat, the connecting plug can be separated from the power connection terminal and pop out of the terminal sleeve after being pushed, the purpose of rapidly separating the power connection terminal from the connecting plug is achieved, the connection state between the electroprobe assembly and the tester main body can be cut off in time, and the testing efficiency is improved. Threatening of electric leakage to personal safety is prevented, and the use safety of the withstand voltage tester is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of voltage withstand testers, in particular to a voltage withstand tester with a protection function. Background Art

[0002] A hipot tester is an important tool for evaluating the insulation and withstand voltage capabilities of electrical components. It simulates performance under extreme conditions by applying a voltage higher than the normal operating voltage. It is widely used in inductor testing to evaluate inductor performance under extreme conditions.

[0003] Currently, in the process of testing the inductor, the electric pen component connected to the voltage tester is brought into contact with the two ports on the inductor to test the inductor. The electric pen component is usually connected to the power terminal of the voltage tester by plugging. When the wire between the electric pen component and the voltage tester is pulled by external force, or when the voltage tester is hit, the connection part between the electric pen component and the voltage tester is easy to loosen or cause deformation of the connection port, or even cause leakage, thereby affecting the testing work of the voltage tester; when leakage occurs, it is difficult to cut off the connection between the electric pen component and the tester body in time by relying solely on data display or sensing electric shock, which can easily pose a threat to personal safety. Summary of the Invention

[0004] In order to overcome the above-mentioned defects, the present invention provides a voltage tester with a protective function, which solves the problem that when the wires between the electric pen assembly and the voltage tester are pulled by external force or the voltage tester is collided, the connection part between the electric pen assembly and the voltage tester is easily loosened or the connection port is deformed, and even leakage is caused, thereby affecting the testing work of the voltage tester; when leakage occurs, it is difficult to cut off the connection status between the electric pen assembly and the tester body in time by relying solely on data display or sensing electric shock.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a withstand voltage tester with a protective function, comprising a tester body, a card holder is provided on the front of the tester body, an electrical terminal is installed inside the card holder, an end of the electrical terminal away from the card holder is arranged inside the tester body, a plug connector is connected to the outer shell of the electrical terminal, an end of the plug connector away from the electrical terminal is connected to an electric pen connection socket, a terminal sleeve is provided outside the electrical terminal, the terminal sleeve is clamped in the card holder, the electrical terminal passes through the terminal sleeve, a support assembly is provided between the terminal sleeve and the electrical terminal, the support assembly is fixed to the inner bottom of the terminal sleeve, a sealing assembly is connected to one side of the support assembly, the sealing assembly is fixed to the inner wall of the terminal sleeve, and the electrical terminal is located in the middle of the sealing assembly;

[0006] The end of the sealing assembly passes through the terminal sleeve and is connected to the supporting assembly. The plug connector contacts the inner wall of the sealing assembly. A protective sleeve is provided outside the terminal sleeve. The protective sleeve is fixedly connected to the tester body. Locking assemblies are respectively installed on both sides of the protective sleeve. A sliding hole is provided on the outer wall of the terminal sleeve corresponding to the end position of the locking assembly. The end of the locking assembly passes through and slides in the sliding hole. Card slots are respectively clamped on both sides of the electric pen connecting seat, and the end of the locking assembly is clamped in the card slot.

[0007] As a further solution of the present invention: a protective component is installed outside the tester body, a plurality of heat dissipation holes are respectively opened on both sides of the tester body, and a leakage detector is installed on the front of the card holder.

[0008] As a further solution of the present invention: the support assembly includes a fixing ring, which is fixed in the terminal sleeve, a cavity is provided in the fixing ring, a piston ring is provided in the cavity, a pressure ring is fixed on one side of the piston ring, the pressure ring passes through the cavity and overlaps with one end of the plug connector, a plurality of first springs are equidistantly provided on the side of the piston ring away from the pressure ring, the end of the first spring is fixed to the inside of the cavity, and the power terminal is located in the fixing ring.

[0009] As a further solution of the present invention: the sealing assembly includes a ferrule, which is installed in the terminal sleeve, an inflatable cushion is provided in the ferrule, three sealing rings are provided in the inflatable cushion, the sealing rings are in contact with the outer wall of the plug connector, and several air guide tubes are equidistantly provided outside the inflatable cushion, and the ends of the air guide tubes pass through the ferrule and are connected to the support assembly.

[0010] As a further solution of the present invention: the locking assembly includes a pull plate, the inner wall of the pull plate is fixedly connected to a card block, the card block passes through the sliding hole and is clamped in the card slot, the end of the card block is designed as an arc surface, and a handle is provided on the side of the pull plate away from the card block.

[0011] As a further solution of the present invention: electromagnets are respectively provided on both sides of the inner wall of the pull plate, the inner wall of the electromagnet is provided with a magnetic block, the magnetic block is installed on the outer wall of the terminal sleeve, and two groups of second springs are fixed between the pull plate and the terminal sleeve, and the number of second springs in each group is two.

[0012] As a further solution of the present invention: a signal line is provided on one side of the electromagnet, and the other end of the signal line is connected to a main control board inside the main body of the tester.

[0013] As a further solution of the present invention: the protective component includes a fixed frame, which is installed outside the tester body. Rubber strips are installed at the four corners of the fixed frame. The rubber strips are L-shaped, and the four rubber strips are respectively wrapped around the four corners of the tester body.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In the present invention, the electric pen is connected to the electric pen connection socket, and the tester body is started to energize the electric pen to test the inductance. During the test, the leakage detector can detect whether there is leakage on the card holder and the tester body. When leakage occurs, the signal line on the electromagnet is connected to the main control board inside the tester body. The main control board can cut off the power of the electromagnet and close the tester body. After the electromagnet is powered off, no magnetic force is generated between the magnetic block and the electromagnet. The elastic support of the second spring can drive the pull plate to move, so that the pull plate drives the card block to move horizontally and disengage from the power supply. The card slot on the pen connection seat allows the electric pen connection seat to be in a freely movable state in the terminal sleeve. Secondly, through the elastic support of the first spring inside the fixed ring, the first spring drives the piston ring to move in the cavity of the fixed ring, so that the piston ring drives the pressure ring to move outward and squeezes the plug connector on the electric pen connection seat. After the plug connector is subjected to the thrust, it can be separated from the power terminal and pop out of the terminal sleeve, thereby achieving the purpose of quickly separating the power terminal and the plug connector, and can timely cut off the connection between the electric pen assembly and the tester body, preventing leakage from posing a threat to personal safety, and improving the safety of use of the voltage tester.

[0016] 2. In the present invention, the plug connector on the electric pen connector is inserted into the terminal sleeve so that the plug connector can completely cover the power terminal. As the plug connector moves into the terminal sleeve, it can push the pressure ring, which in turn drives the piston ring to move in the cavity inside the fixed ring and compress the first spring. As the piston ring continues to move, the gas inside the cavity is introduced into the inflatable cushion through multiple air ducts, causing the inflatable cushion to expand and drive multiple sealing rings to tightly fit the outer wall of the plug connector. The expansion and compression method is used to achieve a sealed connection between the power terminal and the plug connector, which can prevent dust and water from infiltrating the interior of the tester body, prevent leakage safety accidents, and improve the stability of the test operation. When the tester body is started, the electromagnet can be energized through the signal line. The electromagnet generates magnetic force and attracts the magnetic block, so that the pull plate can drive the clamping block to clamp into the clamping slot outside the electric pen connector, thereby locking the plug connector. This prevents the power terminal and the plug connector from loosening due to external force collision of the tester body or pulling of the wires on the electric pen connector, further improving the operating stability of the withstand voltage tester.

[0017] 3. In the present invention, when the plug connector is pulled out, the plug connector is away from the pressure ring, and the piston ring is supported by the elastic force of the first spring, so that the cavity inside the fixed ring can draw the gas inside the inflatable cushion through the air duct, so that the volume of the inflatable cushion is reduced and restored to its initial state, that is, the sealing ring inside the inflatable cushion is separated from the plug connector, and the sealed connection between the power terminal and the plug connector can be released to facilitate the next plug-in installation of the plug connector. Since a protective component is installed on the outside of the tester main body, a plurality of rubber strips are installed on the fixed frame in the protective component, and the rubber strips are L-shaped and covered at the four corners of the tester main body, which can play a role of insulation protection and improve the impact resistance of the tester main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the tester main body of the present invention when viewed from above;

[0020] Figure 3 It is a structural schematic diagram of the cross section of the card holder of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure in which the power terminal and the plug connector are separated according to the present invention;

[0022] Figure 5 This is a schematic structural diagram of a cross section of a terminal sleeve of the present invention;

[0023] Figure 6 Schematic diagram of the structure of the sealing assembly of the present invention;

[0024] Figure 7 It is a structural schematic diagram of the support assembly of the present invention;

[0025] Figure 8 This is a schematic structural diagram of the connection between the protective cover and the locking assembly of the present invention;

[0026] Figure 9 It is a structural schematic diagram of the locking assembly of the present invention;

[0027] In the figure: 1. Tester body; 2. Card holder; 3. Power terminal; 4. Plug connector; 5. Card slot; 6. Electric pen connector; 7. Terminal sleeve; 8. Support assembly; 801. Fixing ring; 802. Cavity; 803. Piston ring; 804. Pressure ring; 805. First spring; 9. Sealing assembly; 901. Card sleeve; 902. Inflatable cushion; 903. Sealing ring; 904. Air guide tube; 10. Protective cover; 11. Locking assembly; 111. Pull plate; 112. Card block; 113. Electromagnet; 114. Second spring; 115. Handle; 116. Signal line; 12. Magnetic block; 13. Sliding hole; 14. Protective assembly; 141. Fixing frame; 142. Rubber strip; 15. Heat dissipation hole; 16. Leakage detector. DETAILED DESCRIPTION

[0028] The technical solution of the present application will be further described in detail below in conjunction with specific implementation methods.

[0029] like Figure 1-9 As shown, the present invention provides a technical solution: a withstand voltage tester with a protection function, comprising a tester body 1, a card holder 2 is provided on the front of the tester body 1, a protective component 14 is installed on the outside of the tester body 1, a plurality of heat dissipation holes 15 are respectively opened on both sides of the tester body 1, and a leakage detector 16 is installed on the front of the card holder 2. Due to the presence of the leakage detector 16, the leakage detector 16 can detect whether there is leakage on the card holder 2 and the tester body 1, so that the main control board inside the tester body 1 can issue commands in a timely manner;

[0030] The protective component 14 includes a fixed frame 141, which is installed outside the tester main body 1. Rubber strips 142 are respectively installed at the four corners of the fixed frame 141. The rubber strips 142 are L-shaped, and the four rubber strips 142 are respectively covered at the four corners of the tester main body 1. Because the rubber strips 142 are L-shaped and covered at the four corners of the tester main body 1, they can play a role in insulation protection and improve the impact resistance of the tester main body 1.

[0031] The card holder 2 is provided with a power terminal 3 inside, and the end of the power terminal 3 away from the card holder 2 is arranged inside the tester body 1, the power terminal 3 is connected with a plug connector 4 outside, and the end of the plug connector 4 away from the power terminal 3 is connected to the electric pen connection seat 6, the power terminal 3 is provided with a terminal sleeve 7 outside, the terminal sleeve 7 is clamped in the card holder 2, the power terminal 3 passes through the terminal sleeve 7, and a support assembly 8 is provided between the terminal sleeve 7 and the power terminal 3, and the support assembly 8 includes a fixing ring 801, the fixing ring 801 is fixed in the terminal sleeve 7, a cavity 802 is provided in the fixing ring 801, a piston ring 803 is provided in the cavity 802, and a pressure ring is fixed on one side of the piston ring 803 804, the pressure ring 804 passes through the cavity 802 and overlaps with one end of the plug connector 4. A plurality of first springs 805 are equidistantly provided on the side of the piston ring 803 away from the pressure ring 804. The ends of the first springs 805 are fixed to the interior of the cavity 802. The power terminal 3 is located in the fixed ring 801. Through the mutual cooperation between the piston ring 803 and the first spring 805, and the elastic support of the first spring 805 inside the fixed ring 801, the piston ring 803 drives the pressure ring 804 to move outward and squeeze the plug connector 4. After the plug connector 4 is pushed, the terminal sleeve 7 can be ejected, and the plug connector 4 can be quickly separated from the power terminal 3.

[0032] The support assembly 8 is fixed to the inner bottom of the terminal sleeve 7, and a sealing assembly 9 is connected to one side of the support assembly 8. The sealing assembly 9 is fixed to the inner wall of the terminal sleeve 7, and the power terminal 3 is located in the middle of the sealing assembly 9. The sealing assembly 9 includes a ferrule 901, which is installed in the terminal sleeve 7. An inflatable cushion 902 is provided in the ferrule 901, and three sealing rings 903 are provided in the inflatable cushion 902. The sealing ring 903 fits the outer wall of the plug connector 4, and a plurality of air guide tubes 904 are equidistantly provided outside the inflatable cushion 902. The end of the air guide tube 904 passes through the ferrule 901 and is connected to the support assembly 8. Through the mutual cooperation between the inflatable cushion 902 and the sealing ring 903, the gas inside the cavity 802 is introduced into the inflatable cushion 902 through the multiple air guide tubes 904, so that the inflatable cushion 902 expands and drives the multiple sealing rings 903 to fit closely with the outer wall of the plug connector 4, thereby improving the sealing connection effect;

[0033] The end of the sealing component 9 passes through the terminal sleeve 7 and is connected to the supporting component 8. The plug connector 4 contacts the inner wall of the sealing component 9. A protective sleeve 10 is provided outside the terminal sleeve 7. The protective sleeve 10 is fixedly connected to the tester body 1. Locking components 11 are respectively installed on both sides of the protective sleeve 10. The locking component 11 includes a pull plate 111. The inner wall of the pull plate 111 is fixedly connected with a clamping block 112. The clamping block 112 passes through the sliding hole 13 and is clamped in the clamping groove 5. The end of the clamping block 112 is designed as an arc surface. A handle 115 is provided on the side of the pull plate 111 away from the clamping block 112. Due to the clamping block 112, the pull plate 111 can drive the clamping block 112 to be clamped into the clamping groove 5 outside the electric pen connecting seat 6, thereby locking the plug connector 4 and preventing the tester body 1 from being collided by external force or the wire on the electric pen connecting seat 6 from being pulled, which may cause the power terminal 3 and the plug connector 4 to become loose.

[0034] Electromagnets 113 are provided on both sides of the inner wall of the pull plate 111. The inner wall of the electromagnet 113 is provided with a magnetic block 12, which is mounted on the outer wall of the terminal sleeve 7. Two sets of second springs 114 are fixed between the pull plate 111 and the terminal sleeve 7, and each set of second springs 114 has two second springs. By providing the second springs 114, the elastic support of the second springs 114 can drive the pull plate 111 to move, so that the pull plate 111 drives the clamping block 112 to move horizontally and disengage from the clamping slot 5 on the electric pen connector 6, thereby facilitating the separation of the plug connector 4 from the power terminal 3.

[0035] A signal line 116 is provided on one side of the electromagnet 113 , and the other end of the signal line 116 is connected to the main control board inside the tester body 1 .

[0036] A sliding hole 13 is provided on the outer wall of the terminal sleeve 7 corresponding to the end position of the locking component 11. The end of the locking component 11 slides through the sliding hole 13. The two sides of the electric pen connecting seat 6 are respectively clamped with a slot 5, and the end of the locking component 11 is clamped in the slot 5.

[0037] The working principle of the present invention is:

[0038] When in use, the electric pen is connected to the electric pen connection socket 6, the tester body 1 is started to energize the electric pen so as to test the inductance. The leakage detector 16 can detect whether there is leakage on the card holder 2 and the tester body 1. When leakage occurs, the signal line 116 on the electromagnet 113 is connected to the main control board inside the tester body 1. The main control board can cut off the power of the electromagnet 113 and turn off the tester body 1. After the electromagnet 113 is powered off, no magnetic force is generated between the magnetic block 12 and the electromagnet 113. The elastic support of the second spring 114 can drive the pull plate 111 to move, so that the pull plate 111 drives the card block 112 to be horizontal. Move and detach from the card slot 5 on the electric pen connection seat 6, and through the elastic support of the first spring 805 inside the fixing ring 801, the first spring 805 drives the piston ring 803 to move in the cavity 802 of the fixing ring 801, so that the piston ring 803 drives the pressure ring 804 to move outward and squeeze the plug connector 4 on the electric pen connection seat 6. After the plug connector 4 is pushed, it can detach from the power terminal 3 and pop out the terminal sleeve 7, so as to achieve the purpose of quickly separating the power terminal 3 from the plug connector 4, and can timely cut off the connection between the electric pen assembly and the tester body 1. When connecting the plug connector 4 to the power terminal 3, the plug connector on the electric pen connection seat 6 is 4 is inserted into the terminal sleeve 7 so that the plug connector 4 can completely cover the power terminal 3. When the plug connector 4 moves into the terminal sleeve 7, it can push the pressure ring 804, and the pressure ring 804 drives the piston ring 803 to move in the cavity 802 inside the fixed ring 801 and squeeze the first spring 805. As the piston ring 803 continues to move, the gas inside the cavity 802 is introduced into the inflatable cushion 902 through multiple air guide tubes 904, causing the inflatable cushion 902 to expand and drive multiple sealing rings 903 to fit tightly with the outer wall of the plug connector 4. When the tester body 1 is started, the electromagnet 113 can be energized through the signal line 116, and the electromagnet 1 13 generates magnetic force and attracts the magnetic block 12, so that the pull plate 111 can drive the card block 112 to be stuck in the card slot 5 outside the electric pen connecting seat 6, thereby locking the plug connector 4. When the plug connector 4 is pulled out, the plug connector 4 is away from the pressure ring 804, and the piston ring 803 is supported by the elastic force of the first spring 805, so that the cavity 802 inside the fixed ring 801 can extract the gas inside the inflatable cushion 902 through the air guide tube 904, so that the volume of the inflatable cushion 902 is reduced and restored to its initial state, that is, the sealing ring 903 inside the inflatable cushion 902 is separated from the plug connector 4, and the sealed connection between the power terminal 3 and the plug connector 4 can be released.

[0039] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0041] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the descriptions with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more schemes or examples.

Claims

1. A withstand voltage tester with a protective function, comprising a tester body (1), characterized in that: The front of the tester body (1) is provided with a card seat (2), an electric terminal (3) is installed inside the card seat (2), the end of the electric terminal (3) away from the card seat (2) is arranged inside the tester body (1), the outer shell of the electric terminal (3) is connected with a plug connector (4), the end of the plug connector (4) away from the electric terminal (3) is connected with an electric pen connection seat (6), the electric terminal (3) is provided with a terminal sleeve (7), the terminal sleeve (7) is clamped in the card seat (2), the electric terminal (3) passes through the terminal sleeve (7), a support component (8) is provided between the terminal sleeve (7) and the electric terminal (3), the support component (8) is fixed to the inner bottom of the terminal sleeve (7), a sealing component (9) is connected to one side of the support component (8), the sealing component (9) is fixed to the inner wall of the terminal sleeve (7), and the electric terminal (3) is located in the middle of the sealing component (9); The end of the sealing component (9) passes through the terminal sleeve (7) and is connected to the support component (8); the plug connector (4) contacts the inner wall of the sealing component (9); a protective sleeve (10) is provided on the outside of the terminal sleeve (7); the protective sleeve (10) is fixedly connected to the tester body (1); locking components (11) are respectively installed on both sides of the protective sleeve (10); a sliding hole (13) is opened on the outer wall of the terminal sleeve (7) at the position corresponding to the end of the locking component (11); the end of the locking component (11) passes through the sliding hole (13) and slides in the sliding hole (13); the two sides of the electric pen connecting seat (6) are respectively clamped with a card slot (5); the end of the locking component (11) is clamped in the card slot (5).

2. A withstand voltage tester with a protection function according to claim 1, characterized in that: A protective component (14) is installed outside the tester body (1), a plurality of heat dissipation holes (15) are respectively opened on both sides of the tester body (1), and a leakage detector (16) is installed on the front of the card seat (2).

3. The voltage withstand tester with protection function according to claim 1, characterized in that: The support assembly (8) includes a fixing ring (801), the fixing ring (801) is fixed in the terminal sleeve (7), a cavity (802) is provided in the fixing ring (801), a piston ring (803) is provided in the cavity (802), a pressure ring (804) is fixed on one side of the piston ring (803), the pressure ring (804) passes through the cavity (802) and overlaps with one end of the plug connector (4), a plurality of first springs (805) are equidistantly provided on the side of the piston ring (803) away from the pressure ring (804), the end of the first spring (805) is fixed to the inside of the cavity (802), and the power terminal (3) is located in the fixing ring (801).

4. The voltage withstand tester with protection function according to claim 1, characterized in that: The sealing assembly (9) includes a ferrule (901), the ferrule (901) is installed in the terminal sleeve (7), an air cushion (902) is provided in the ferrule (901), three sealing rings (903) are provided in the air cushion (902), the sealing rings (903) are in contact with the outer wall of the plug connector (4), and a plurality of air guide tubes (904) are equidistantly provided outside the air cushion (902), and the ends of the air guide tubes (904) pass through the ferrule (901) and are connected to the support assembly (8).

5. The voltage withstand tester with protection function according to claim 1, characterized in that: The locking assembly (11) includes a pull plate (111), the inner wall of the pull plate (111) is fixedly connected with a clamping block (112), the clamping block (112) passes through the sliding hole (13) and is clamped in the clamping groove (5), the end of the clamping block (112) is designed as an arc surface, and a handle (115) is provided on the side of the pull plate (111) away from the clamping block (112).

6. The voltage withstand tester with protection function according to claim 5, characterized in that: Electromagnets (113) are respectively provided on both sides of the inner wall of the pull plate (111), and a magnetic block (12) is provided on the inner wall of the electromagnet (113). The magnetic block (12) is installed on the outer wall of the terminal sleeve (7). Two groups of second springs (114) are fixed between the pull plate (111) and the terminal sleeve (7), and the number of each group of second springs (114) is two.

7. The voltage withstand tester with protection function according to claim 6, characterized in that: A signal line (116) is provided on one side of the electromagnet (113), and the other end of the signal line (116) is connected to a main control board inside the tester body (1).

8. The voltage withstand tester with protection function according to claim 1, characterized in that: The protective component (14) comprises a fixing frame (141), the fixing frame (141) being mounted outside the tester body (1), and rubber strips (142) being mounted at the four corners of the fixing frame (141), the rubber strips (142) being L-shaped, and the four rubber strips (142) respectively covering the four corners of the tester body (1).

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