Safety mechanism and insulation and voltage resistance testing device

Abstract

The utility model discloses a safety mechanism and an insulation and voltage resistance testing device, and the safety mechanism comprises a conduction part which is grounded. A connecting piece is fixed on the first insulating piece, and the HV / LV wire at the tool end and the HV / LV wire at the instrument end can be connected to the connecting piece; the driving device is in insulated connection with the connecting piece or the conducting piece and can drive the conducting piece to be connected with the connecting piece; the conduction piece is driven to be separated from the connecting piece; wherein the conducting piece and the connecting piece are both conductive. According to the invention, the cost is reduced on the premise of meeting the test requirements.

Description

Technical Field

[0001] This application relates to the technical field of electrical safety, and particularly relates to a safety mechanism and an insulation withstand voltage test device. Background Art

[0002] In the EOL final inspection and test of new energy electric vehicle products, especially electric drive products, insulation withstand voltage test is an important part. By applying thousands of volts of voltage to the product through an insulation withstand voltage tester to verify the safety regulations characteristics of the product and ensure that the product meets the relevant requirements of the regulations. Due to the relatively high test voltage and the fact that new energy products such as inverters themselves have capacitors, if the product does not discharge completely or due to instrument failure, high voltage is applied to the signal line of the tooling fixture, it may cause damage to the human body or the circuit part of the tooling fixture.

[0003] When performing this part of the test, most solutions rely only on the safety strategy of the insulation withstand voltage tester itself to achieve the power-off and product discharge functions after the test. If there is a failure of the insulation withstand voltage tester, since the voltage cannot be directly seen, the safety of the human body or the fixture line cannot be guaranteed.

[0004] Some solutions will construct a safety loop circuit. The general method implemented by this circuit is to control the suction of the high-voltage relay through two interlocked secondary relays to ground the high-voltage terminal, thereby achieving the release of high voltage. Similar solutions have problems such as high component prices, long procurement cycles, limitations in the selection of high-voltage components according to the test voltage, and stability issues. Summary of the Utility Model

[0005] One of the purposes of this application is to provide a safety mechanism to solve the problems raised in the background art.

[0006] A safety mechanism includes:

[0007] A conducting member, which is arranged to be grounded;

[0008] A first insulating member, on which a connecting member is fixed, and the HV / LV wires at the tooling end and the HV / LV wires at the instrument end can both be connected to the connecting member;

[0009] A driving device, which is insulatedly connected to the connecting member or the conducting member, and can drive the conducting member and the connecting member to approach each other so that the conducting member is connected to the connecting member; and drive the conducting member and the connecting member to move away from each other so that the conducting member is disengaged from the connecting member;

[0010] Wherein, both the conducting member and the connecting member have electrical conductivity.

[0011] Further, it further includes an elastic member. One end of the elastic member is fixed, and the other end is insulatedly connected to the conduction member or the connection member. The elasticity of the elastic member has a tendency to drive the conduction member and the connection member closer to each other.

[0012] Further, the safety mechanism further includes a fixing plate, and both the elastic member and the driving device are disposed between the fixing plate and the conduction member.

[0013] Further, the driving device is fixed on the fixing plate, the conduction member is fixed on the second insulating member, the output end of the driving device is connected to the second insulating member, and both ends of the elastic member are respectively connected to the fixing plate and the second insulating member.

[0014] Further, it further includes a detection part for detecting the position of the conduction member. When the conduction member contacts the connection member, the detection part issues a in-place signal, and the driving device stops driving.

[0015] Further, the detection part includes a travel column and a sensor. The travel column is insulatedly connected to the conduction member, the travel column extends towards the first insulating member, the travel column can collapse towards the inside, and the sensor is located inside the travel column. When the sensor detects that the collapse amount of the travel column reaches a preset collapse amount, it issues the in-place signal.

[0016] Further, the number of the connection members is at least two, and there is at least one connection member, and the number of the conduction members corresponding to this connection member is at least 2.

[0017] Further, the conduction member is connected to the arc extinguishing module, and the arc extinguishing module is arranged grounded.

[0018] Further, the number of the driving devices is at least 2.

[0019] Further, the connection member is a copper busbar.

[0020] Further, the driving device is a travel switch, a cylinder or a hydraulic cylinder.

[0021] An insulation withstand voltage test device includes the above-mentioned safety mechanism. The safety mechanism includes a conduction member and a connection member. When in a non-test mode, the conduction member is connected to the connection member, and when in a test mode, the conduction member is disconnected from the connection member.

[0022] Further, it further includes an insulation withstand voltage tester and several connection line groups. The number of the connection members is an even number. Each connection line group includes a tooling end HV line, a tooling end LV line, an instrument end HV line and an instrument end LV line. Each connection line group corresponds to a pair of connection members, so that:

[0023] One end of the HV line at the tooling end and the HV line at the instrument end are both connected to one of the connectors, and the other ends of the HV line at the tooling end and the HV line at the instrument end are respectively connected to the high-voltage terminal of the device under test and the insulation withstand voltage tester;

[0024] One end of the LV line at the tooling end and the LV line at the instrument end are both connected to the other connector, and the other ends of the LV line at the tooling end and the LV line at the instrument end are respectively connected to the low-voltage terminal of the device under test and the insulation withstand voltage tester.

[0025] The technical solution of the present application has at least the following advantages:

[0026] In the present application, a conducting member with conductivity and grounded arrangement is provided, a conductive connector is provided on the first insulating member, and a driving device is provided. The driving device is insulated from the conducting member or the connector. In the non-test state, the driving device drives the conducting member to be connected to the connector, so that the conducting member and the connector are electrically connected, thereby grounding the tooling end and the instrument end at the same time, ensuring safety. In the test state, the driving device drives the conducting member and the connector to be separated from each other, so that the connector and the conducting member are disconnected. Based on the above working mode, except that the voltage level needs to be determined at the initial design stage for the materials and thicknesses of the first insulating member and the components that achieve the above-mentioned "insulated connection" (the material cost of this part is low), since the driving device is not in direct contact with the test voltage, the voltage level requirements for the selection of this part of the devices are not high, and the insulation gap can be further increased by adjusting the distance between the conducting member and the connector. Therefore, there are no special requirements for the selection of components and subsequent spare parts. Therefore, the voltage level requirements for the devices in the safety box in this solution are low. It can not only meet the insulation withstand voltage test at the kilovolt level, but also continue to increase the test voltage. At the same time, there is no need to set special high-voltage components or relays. Compared with the prior art, this solution reduces the cost while meeting the test requirements.

[0027] In the present application, both the LV / HV lines at the instrument end and the LV / HV lines at the tooling end are connected to a conductive connector. During the test process, the test failure caused by the failure of the relay contacts is reduced, ensuring the stability of the test.

[0028] In the present application, a travel post and an elastic member are provided, and a plurality of conducting members are correspondingly provided for at least one connector, which improves the connection redundancy between the conducting member and the connector, ensures that the conducting member and the connector can be connected in the non-test state, and further reduces the test cost compared with the prior art by eliminating the residual voltage detection module. Description of the Drawings

[0029] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 is the wiring principle of the safety circuit in the prior art;

[0031] Figure 2 is the schematic diagram of the common safety circuit implementation in the safety box of the prior art;

[0032] Figure 3 is the schematic diagram of the connection method of the grounding arc extinguishing and residual voltage detection module in the prior art;

[0033] Figure 4 is the schematic diagram of the structure of the present utility model;

[0034] Figure 5 is the schematic diagram of the arrangement of the connecting piece;

[0035] Figure 6 is the schematic diagram of the arrangement of the travel column;

[0036] Figure 7 is the schematic diagram of the arrangement of the conducting piece;

[0037] Figure 8 is the schematic diagram of the arrangement of the conducting piece;

[0038] Figure 9 is the schematic diagram of the arrangement of the conducting piece;

[0039] Figure 10 is the schematic diagram of the arrangement of the driving device;

[0040] Figure 11 is the schematic diagram of the grounding method of the conducting piece;

[0041] Figure 12 is the schematic diagram of the structure of the insulation withstand voltage test device.

[0042] Among them, 1 - the second insulating member; 2 - the first insulating member; 3 - the conducting piece; 4 - the connecting piece; 5 - the driving device; 6 - the elastic member; 7 - the fixing plate; 8 - the tooling end; 81 - the tooling end HV wire; 82 - the tooling end LV wire; 9 - the instrument end; 91 - the instrument end HV wire; 92 - the instrument end LV wire; 10 - the travel column; 11 - the arc extinguishing module; 12 - the insulation withstand voltage tester. Specific Embodiments

[0043] The technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0044] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0045] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can also be the communication inside two elements. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0046] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0047] Embodiment 1

[0048] Principle of Insulation Withstand Voltage Test Figure 1 As shown, through two ports HV1 and HV2, all the high-voltage terminals of the product are connected together with withstand voltage wires, and through two ports LV1 and LV2, all the low-voltage terminals of the product are connected together with withstand voltage wires. The insulation withstand voltage tester applies a specific voltage between the high-voltage terminals and the low-voltage terminals to detect the insulation resistance characteristics or withstand voltage characteristics, etc. of the product.

[0049] Add a safety box between the insulation withstand voltage tester and the tooling. In the non-test state, the safety box connects all the HV / LV wires of the tooling ends ( Figure 1 HV1 / 2, LV1 / 2 on the right side of the safety box) and the HV / LV wires of the tester end ( Figure 1On the left side of the safety box (HV1 / 2, LV1 / 2) and grounded, so that both the instrument end and the product end are grounded. During testing, the switch inside the safety box disconnects all high-voltage terminal wires and low-voltage terminal wires, insulating the test system from the ground.

[0050] As Figure 2 shown, it is a general method for implementing the safety circuit. Specifically: two secondary relays K1 and K2 are in an interlocking structure. When the coil of secondary relay K1 is in the energized state, the coil of K2 is in the de-energized state. At this time, the normally open contact of K1 closes, and the normally closed contact of K2 also closes. The coil of high-voltage relay K100 energizes, and the high-voltage terminal is insulated from the ground.

[0051] When the coil of secondary relay K1 is in the de-energized state, the coil of K2 is in the energized state. At this time, the normally open contact of K1 opens, and the normally closed contact of K2 also opens. The coil of high-voltage relay K100 de-energizes, and the high-voltage terminal is grounded.

[0052] As Figure 3 shown, in order to ensure that there is no electric spark problem when the relay is just grounded after the test, an arc extinguishing device or an RC circuit module can be added between the grounding point of the high-voltage relay and the ground. In order to avoid the failure of the relay contacts, it is necessary to detect whether there is residual voltage after the test is completed, and a residual voltage detection module is connected in parallel between the grounding point of the high-voltage relay and the ground.

[0053] There are problems with this solution:

[0054] 1) There is a risk of poor contact of the contacts of the secondary relay, which may cause the test to fail or there is no grounding after the test. If a secondary relay with better stability is selected, the usage and replacement costs will also increase accordingly.

[0055] 2) The selection of the high-voltage relay and related electrical components needs to match the test voltage. In this case, for different levels of insulation withstand voltage tests, it may be necessary to prepare high-voltage relays of different levels and the secondary relays that match them. If a higher voltage level high-voltage relay is used to cover the original voltage level, the usage and replacement costs will also increase accordingly.

[0056] To address the above problems, this embodiment proposes a safety mechanism, as Figure 4 shown, including a first insulating member 2, a second insulating member 1, a conducting member 3, a connecting member 4, and a driving device 5.

[0057] Both the first insulating member 2 and the second insulating member 1 are made of insulating materials.

[0058] A conducting member 3 with a grounding arrangement is fixed on the second insulating member 1. The conducting member 3 has conductivity. A connecting member 4 is fixed on the first insulating member 2. The connecting member 4 has conductivity. Both the tooling end 8 and the instrument end 9 can be connected to the connecting member 4. Specifically: both the HV line 81 of the tooling end and the HV line 91 of the instrument end are connected to the connecting member 4, or both the LV line 82 of the tooling end and the LV line 92 of the instrument end are connected to the connecting member 4, thereby realizing the rigid connection between the tooling end 8 and the instrument end 9. Specifically, as Figure 5 shown:

[0059] The high-voltage and low-voltage terminals of the instrument end 9 and the tooling end 8 are connected by hard wires and are fixedly arranged on the connecting member 4 one by one. The connecting member 4 is fixed through the first insulating member 2 and is insulated from the ground.

[0060] In this embodiment, the HV line represents the test connection wire on the high-voltage side of the product; the LV line represents the test connection wire on the low-voltage side of the product. Both the HV line and the LV line are high-voltage-resistant wires. The insulation withstand voltage tester applies a high voltage between the high-voltage side and the low-voltage side of the product through the HV line and the LV line to perform an insulation withstand voltage test.

[0061] In at least one embodiment, the output end of the driving device 5 is connected to the conducting member 3 through an insulating component, such as rubber, plastic, etc.

[0062] In at least one embodiment, the output end of the driving device 5 is connected to the second insulating member 1, thereby realizing an insulated connection with the conducting member 3. The driving device 5 can drive the first insulating member 2 and the second insulating member 1 to approach each other, so that the conducting member 3 is connected to the connecting member 4; or drive the first insulating member 2 and the second insulating member 1 to move away from each other, so that the conducting member 3 is disconnected from the connecting member 4.

[0063] Conversely, when the moving end (also called the output end) of the driving device 5 is fixedly connected to the first insulating member 2, the above process can also be realized, which will not be elaborated here.

[0064] The driving device 5 can be a travel switch, a servo motor, a cylinder or a hydraulic cylinder.

[0065] In this embodiment, the connection between the above-mentioned conducting member 3 and the connecting member 4 can be understood as the following several connection methods:

[0066] 1. The conducting member 3 is pressed on the connecting member 4 to realize the conduction between the conducting member 3 and the connecting member 4;

[0067] 2. A snap lock is provided on the connecting member 4. The snap lock is a kind of latch. The conducting member 3 is provided with a head structure that cooperates with the snap lock. The head structure collides with the snap lock under the drive of the driving device 5 to realize a latch connection. When the driving device 5 drives the first insulating member 2 away from the second insulating member 1, under the action of the pulling force, the head structure is disengaged from the snap lock.

[0068] The conducting member 3 is a grounding probe. Both the conducting member 3 and the connecting member 4 are made of metal materials. When the two are connected, the conduction between the conducting member 3 and the connecting member 4 is achieved. In at least one embodiment, the connecting member 4 is a copper bar.

[0069] In this embodiment, the driving device 5 is fixed on the fixing plate 7. The output end of the driving device 5 is connected to the second insulating member 1. The implementation manner of the above safety mechanism is as follows:

[0070] In the non-test state, the driving device 5 drives the second insulating member 1 to gradually move downward and approach the first insulating member 2, so that the conducting member 3 and the connecting member 4 are in contact, thereby grounding the tooling end 8 and the instrument end 9 simultaneously. When testing, the driving device 5 drives the second insulating member 1 to move upward, making the first insulating member 2 away from the second insulating member 1, and separating the conducting member 3 and the connecting member 4. Since the tooling end 8 and the instrument end 9 are only fixed on the first insulating member 2, the test system is in an insulating state. The PLC sends an interlock signal to make this mechanism in a state where high voltage can be output, and at this time, an insulation withstand voltage test can be performed.

[0071] In at least one embodiment, an elastic member 6 is further provided in this mechanism. One end of the elastic member 6 is fixed, and the other end is connected to the first insulating member 2. The elastic force of the elastic member 6 has a tendency to drive the conducting member 3 and the connecting member 4 to approach. The purpose is that in the non-test state, when the conducting member 3 is in contact with the connecting member 4, the elastic force of the elastic member 6 compresses the conducting member 3 to further press the connecting member 4, making the conducting member 3 and the connecting member 4 more tightly connected, and avoiding accidents caused by the loosening of the conducting member 3 in the non-test state.

[0072] In this embodiment, both the elastic member 6 and the driving device are arranged between the fixing plate 7 and the second insulating member 1. The two ends of the elastic member 6 are respectively connected to the fixing plate 7 and the second insulating member 1. When the driving device 5 retracts, the elastic member 6 will be compressed. At this time, the elastic member 6 has a tendency to stretch. In the non-test state and when the driving device 5 fails, the elastic force of the elastic member 6 will drive the second insulating member 1 to immediately approach the first insulating member 2 until the conducting member 3 is pressed on the connecting member 4, ensuring contact redundancy and improving safety and stability.

[0073] The elastic member 6 in this embodiment is a compression spring.

[0074] In order to increase the contact redundancy between the connecting member 4 and the conducting member 3, the number of connecting members 4 is at least two. There is at least one connecting member 4, and the number of conducting members 3 corresponding to this connecting member is at least 2.

[0075] As Figure 6 shown, in at least one embodiment, the number of connecting members 4 is 4. In order to ensure that all conducting members 3 are in the grounded state in the non-test state, 4 groups of conducting members 3 are set at the same time. Each group of conducting members 3 corresponds to each connecting member 4 one by one. AsFigure 7 As shown, the number of each group of conducting members 3 is 4, which improves the contact redundancy between the connecting member 4 and the conducting member 3.

[0076] As Figure 8 shown, in at least one embodiment, the number of connecting members 4 is 4. The number of conducting members 3 corresponding to the connecting members 4 at the ends is 4, and the number of conducting members 3 corresponding to the remaining connecting members 4 is 1.

[0077] In at least one embodiment, as Figure 9 shown, the number of connecting members 4 is 4. Only one of the connecting members 4 is correspondingly provided with a plurality of conducting members 3, and the remaining connecting members 4 are not provided with corresponding conducting members 3.

[0078] To ensure contact redundancy, a detection part is provided on the second insulating member 1. The detection part is electrically connected to the PLC. When the detection part detects that the connecting member is connected to the conducting member, the detection part sends an in-place signal to the PLC, and the PLC controls the driving device to stop driving. The driving device 5 is electrically connected to the PLC.

[0079] In at least one embodiment, the detection part includes a travel post 10 and a contact sensor. The length of the travel post 10 is greater than the length of the conducting member 3, and the difference between the two is equal to or slightly less than the thickness of the connecting member 4. Therefore, a contact sensor can be provided at the bottom of the travel post 10. When the position of the second insulating member 1 causes the travel post 10 to press against the first insulating member 2, the contact sensor sends the in-place signal to the PLC. After receiving the in-place signal, the PLC controls the driving device 5 to stop driving. At this time, it can be ensured that the conducting member 3 is in contact with the connecting member 4.

[0080] In at least one embodiment, the detection part includes a travel post and a sensor. The length of the travel post 10 is greater than the length of the conducting member 3, and the travel post 10 can axially collapse inward, that is, the lower half of the travel post is slidably connected to the upper half. When a force is applied to the lower half, the lower half shrinks into the upper half. The sensor is provided inside the travel post 10. When the length of the lower half entering the upper half reaches a preset collapse amount (the setting of the preset collapse amount needs to consider the length of the conducting member 3, the thickness of the connecting member 4, and the length of the travel post 10, ensuring that when the preset collapse amount is reached, the conducting member 3 is in contact with the connecting member 4), the sensor senses the lower half and sends the in-place signal to the PLC. The PLC controls the driving device 5 to stop driving. At this time, it can be ensured that the conducting member 3 is in contact with the connecting member 4. The sensor here can be an infrared sensor. The infrared sensor includes an infrared emitting device and an infrared receiving device. The infrared emitting device and the infrared receiving device are arranged in parallel at a preset position. When the infrared receiving device cannot receive the infrared rays emitted by the infrared emitting device, it means that the preset collapse amount has been reached, and an in-place signal is sent.

[0081] Therefore, a travel column 10 is provided to ensure contact redundancy and increase the detection of the in-place signal. When the conducting member 3 contacts the connecting member 4, the in-place signal is also in the in-place state.

[0082] In at least one embodiment, the detection unit is integrated on the driving device 5 and is used to calculate the extended length of the driving device 5. When it is detected that the extended amplitude of the output end of the driving device 5 can enable the conducting member 3 to be connected to the connecting member 4, an in-place signal is sent to the PCL. For example, when the driving device 5 is a combination of a servo motor and a ball screw pair, the detection unit calculates the extended length of the screw by collecting the number of rotations of the servo motor, and then calculates the extended amplitude.

[0083] As Figure 10 shown, in at least one embodiment, in order to ensure secondary redundancy, two or more driving devices 5 can be used. When some of the driving devices 5 fail, the other driving devices 5 can still work normally.

[0084] As Figure 11 shown, by setting the elastic member 6, the in-place signal, the multi-conducting member 3 contact, and adding the interlock signal and grounding function of the insulation withstand voltage tester itself, grounding and safety can be ensured. Therefore, the residual voltage detection module can be considered omitted, and only the arc extinguishing module 11 is retained. The arc extinguishing module 11 is grounded and electrically connected to all the conducting members 3 to achieve the grounding of the conducting members 3.

[0085] Embodiment 2

[0086] This embodiment provides an insulation withstand voltage testing device. As Figure 12 shown, it includes the safety mechanism described in Embodiment 1. Combining Figure 5 and Figure 12 shown, this embodiment further includes an insulation withstand voltage tester 12 and a plurality of connecting wire groups. The number of connecting members is an even number. The connecting wire groups include a tooling end HV wire 81, a tooling end LV wire 82, an instrument end HV wire 91, and an instrument end LV wire 92. Each connecting wire group corresponds to a pair of connecting members 4, such that:

[0087] One end of the tooling end HV wire 81 and the instrument end HV wire 91 are both connected to one of the connecting members 4, and the other ends of the tooling end HV wire 81 and the instrument end HV wire 91 are respectively connected to the high-voltage terminal of the device under test and the insulation withstand voltage tester 12;

[0088] One end of the tooling end LV wire 82 and the instrument end LV wire 92 are both connected to another connecting member 4, and the other ends of the tooling end LV wire 82 and the instrument end LV wire 92 are respectively connected to the low-voltage terminal of the device under test and the insulation withstand voltage tester 12.

[0089] When in non-test mode, the conducting member 3 is connected to the connecting member 4. When in test mode, the conducting member 3 is disconnected from the connecting member 4. The insulation withstanding voltage tester 12 applies a specific voltage between the high-voltage terminal and the low-voltage terminal of the device under test to detect the insulation resistance characteristics or the withstanding voltage characteristics, etc. of the device under test.

[0090] In this embodiment, the number of the connecting members 4 is 2 pairs, and the number of the connecting wire groups is 2.

[0091] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A safety mechanism, characterized in that: include: A conductive member, wherein the conductive member is arranged to be grounded; A first insulating member, on which a connecting member is fixed, and the HV / LV line at the tooling end and the HV / LV line at the instrument end can both be connected to the connecting member; A driving device is insulated and connected to the connecting member or the conducting member, and is capable of driving the conducting member and the connecting member closer to each other so that the conducting member and the connecting member are connected; and driving the conducting member and the connecting member away from each other so that the conducting member and the connecting member are disconnected; Wherein, the conducting member and the connecting member are both conductive.

2. The safety mechanism according to claim 1, characterized in that: It also includes an elastic member, one end of which is fixed, and the other end is insulated and connected to the conductive member or the connecting member, and the elasticity of the elastic member has a tendency to drive the conductive member and the connecting member to approach each other.

3. The safety mechanism according to claim 2, characterized in that: The safety mechanism further comprises a fixing plate, and the elastic member and the driving device are both arranged between the fixing plate and the conducting member.

4. The safety mechanism according to claim 3, characterized in that: The driving device is fixed on the fixing plate, the conducting member is fixed on the second insulating member, the output end of the driving device is connected to the second insulating member, and both ends of the elastic member are respectively connected to the fixing plate and the second insulating member.

5. The safety mechanism according to claim 1, characterized in that: It also includes a detection unit for detecting the position of the conductive member. When the conductive member contacts the connecting member, the detection unit sends a position signal and the driving device stops driving.

6. The safety mechanism according to claim 5, characterized in that: The detection part includes a stroke column and a sensor. The stroke column is insulated and connected to the conductive part. The stroke column extends toward the first insulating part. The stroke column can collapse inwardly. The sensor is located inside the stroke column. When the sensor detects that the collapse amount of the stroke column reaches a preset collapse amount, the in-place signal is issued.

7. The safety mechanism according to claim 1, characterized in that: The number of the connecting members is at least two, and there is at least one connecting member, and the number of the conducting members corresponding to the connecting member is at least two.

8. The safety mechanism according to claim 1, characterized in that: The conducting member is connected to an arc extinguishing module, and the arc extinguishing module is grounded.

9. The safety mechanism according to claim 1, characterized in that: The number of the driving devices is at least 2.

10. The safety mechanism according to claim 1, characterized in that: The connecting piece is a copper busbar.

11. The safety mechanism according to claim 1, characterized in that: The driving device is a travel switch, a cylinder or a hydraulic cylinder.

12. An insulation withstand voltage test device, characterized in that: The safety mechanism comprises the safety mechanism described in any one of claims 1 to 11, wherein the safety mechanism comprises a conductive member and a connecting member, wherein the conductive member is connected to the connecting member when in non-test mode, and the conductive member is disconnected from the connecting member when in test mode.

13. The insulation withstand voltage test device according to claim 12, characterized in that: It also includes an insulation withstand voltage tester and a plurality of connecting wire groups, wherein the number of the connecting pieces is an even number, and the connecting wire groups include a tooling end HV line, a tooling end LV line, an instrument end HV line, and an instrument end LV line, and each of the connecting wire groups corresponds to a pair of connecting pieces, such that: One end of the tooling end HV line and the instrument end HV line are connected to one of the connectors, and the other ends of the tooling end HV line and the instrument end HV line are connected to the high voltage terminal of the device to be tested and the insulation withstand voltage tester respectively; One end of the tooling end LV line and the instrument end LV line are connected to another connector, and the other ends of the tooling end LV line and the instrument end LV line are respectively connected to the low voltage terminal of the device to be tested and the insulation withstand voltage tester.

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