Power supply connecting device and electric welding machine testing device

Abstract

The utility model discloses a power supply connecting device and an electric welding machine testing device. The power supply connecting device comprises a socket box and at least two power supply lines. A plurality of groups of jacks are arranged on the socket box, a conductive electrode is arranged in the socket box, and the conductive electrode is arranged on one side of the jacks; the power supply input end of the power supply circuit is used for accessing power supply voltage; the power supply output end of the power supply circuit is connected with the conductive electrode; a switch module is arranged in the power supply line and is used for controlling the conduction state between the power supply input end and the power supply output end; wherein the power supply voltages of at least two power supply lines are different. According to the technical scheme, plugs of different specifications and / or electric equipment with different voltage requirements can be matched, occupation of production resources is reduced, production efficiency is improved, and operation complexity and error risks are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply connection, in particular to a power supply connection device and an electric welding machine testing device. Background Art

[0002] Inspection and debugging of electric welding machines are key steps to ensure that welding equipment meets performance standards and operates safely, and play an important role in the production and manufacturing process of electric welding machines.

[0003] During the production inspection process of welding machines, due to the lack of unified global power supply voltage and socket standards, the input voltage and plug specifications of different countries vary greatly. It is necessary to set up matching sockets according to the specifications of the welding machine plug as inspection tooling to achieve product compatibility testing.

[0004] Since each plug specification requires a corresponding socket tooling, the production line must be equipped with a large number of socket tooling and frequently switch between different products. This not only increases the occupation of production resources and reduces production efficiency, but also increases the complexity of operations and the risk of errors. Utility Model Content

[0005] The utility model provides a power supply connection device and an electric welding machine testing device to match plugs of different specifications or electrical equipment with different voltage requirements, thereby reducing the occupation of production resources, improving production efficiency, and reducing the complexity of operation and the risk of errors.

[0006] According to a first aspect of the present invention, a power supply connection device is provided, comprising: a socket box and at least two power supply lines; the socket box is provided with multiple groups of jacks, and a conductive electrode is provided in the socket box, and the conductive electrode is provided on one side of the jacks; the power supply input end of the power supply line is used to receive the power supply voltage, and the power supply output end of the power supply line is connected to the conductive electrode; a switch module is provided in the power supply line, and the switch module is used to control the conduction state between the power supply input end and the power supply output end; wherein the supply voltages of at least two power supply lines are different.

[0007] Optionally, the switch module includes: a switching power access terminal, a push button switch, a relay and an AC contactor; the relay includes a first coil and a first switch contact, and the first coil and the push button switch are connected in series to the switching power access terminal; the AC contactor includes a second coil and a second switch contact, and the second coil and the first switch contact are connected in series between the live wire and the neutral wire of the power supply line; the second switch contact is connected in series between the power supply input terminal and the power supply output terminal; the second switch contact is a normally open contact.

[0008] Optionally, the relay includes a time relay, and the first switch contact is a normally closed contact; the time relay is used to start timing after the first coil is energized, and to disconnect the first switch contact after the timing reaches a set time.

[0009] Optionally, the power supply connection device further includes at least two circuit breakers, at least one circuit breaker is provided in each power supply line, and the circuit breaker is connected in series with the second switch contact.

[0010] Optionally, the power supply connection device includes at least two connectors, the connectors are connected to the power supply output end, and the connectors are electrically connected to the power supply lines in a one-to-one correspondence.

[0011] Optionally, at least one group of sockets in the power supply connection device includes a live socket, a neutral socket and a ground socket; the conductive electrodes include a first conductive electrode, a second conductive electrode and a third conductive electrode, the first conductive electrode is arranged on one side of the live socket, the second conductive electrode is arranged on one side of the neutral socket, and the third conductive electrode is arranged on one side of the ground socket; the power supply input end includes a first phase input end, a second phase input end, a third phase input end and a neutral input end, and the power supply output end includes a first phase output end, a second phase output end, a third phase output end and a neutral output end; the first phase input end is electrically connected to the first phase output end through a switch module, the second phase input end is electrically connected to the second phase output end through a switch module, the third phase input end is electrically connected to the third phase output end through a switch module, and the neutral input end is electrically connected to the neutral output end; the first phase output end is electrically connected to the first conductive electrode, the neutral output end is electrically connected to the second conductive electrode, and the third conductive electrode is grounded; the connector is electrically connected to the first phase output end, the second phase output end, the third phase output end and the neutral output end respectively.

[0012] Optionally, the connector in the power supply connection device includes a switch group, the switch group includes a first switch, a second switch, a third switch and a fourth switch, the first switch is electrically connected to the first phase output end, the second switch is electrically connected to the second phase output end, the third switch is electrically connected to the third phase output end, and the fourth switch is electrically connected to the neutral line output end.

[0013] Optionally, different groups of sockets in the power supply connection device have different socket arrangements, different socket shapes, or different socket sizes.

[0014] Optionally, the socket box in the power supply connection device includes an upper box body and a lower box body, and the upper box body and the lower box body are fixedly connected; a first positioning column is provided on the side of the upper box body close to the lower box body, and a second positioning column is provided on the side of the lower box body close to the upper box body; the conductive electrode is fixed by the first positioning column and the second positioning column.

[0015] According to a second aspect of the present invention, a welding machine testing device is provided, comprising the power supply connection device provided in the first aspect.

[0016] The power supply connection device and the electric welding machine testing device of the embodiment of the present invention are conducive to achieving compatible matching of plugs of different specifications by setting multiple groups of jacks on the socket box. By setting at least two power supply lines, the power supply input end of the power supply line is connected to the power supply voltage, and the output end of the power supply line is electrically connected to the conductive electrode in the socket box, so that when a plug is inserted into the jack, the power supply voltage can be connected through the conductive electrode and the power supply line. The power supply voltages of at least two power supply lines are different, and a switch module is set in the power supply line. When different switch modules are turned on, different power supply voltages can be provided to the electrical equipment, and then the socket box of the power supply connection device can be adapted to electrical equipment of different voltage specifications. Therefore, the power supply connection device of this embodiment can match plugs of different specifications and / or electrical equipment with different voltage requirements, reduce the occupation of production resources, improve production efficiency, and reduce the complexity of operation and the risk of error.

[0017] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a structural diagram of a power supply connection device provided according to an embodiment of the present utility model;

[0020] Figure 2 is a circuit diagram of another power supply connection device provided according to an embodiment of the present utility model;

[0021] Figure 3 This is an exploded view of a power supply connection device provided according to an embodiment of the present utility model;

[0022] Figure 4 This is a front view of a power supply connection device provided according to an embodiment of the utility model;

[0023] Figure 5 This is a bottom view of a power supply connection device provided according to an embodiment of the present utility model;

[0024] Figure 6 This is a top view of a power supply connection device provided according to an embodiment of the present utility model;

[0025] Figure 7 This is a right side view of a power supply connection device provided according to an embodiment of the present utility model;

[0026] Figure 8 This is a left side view of a power supply connection device provided according to an embodiment of the present utility model;

[0027] Figure 9 It is an axial diagram of a power supply connection device provided according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0028] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] Figure 1 This is a schematic diagram of the structure of a power supply connection device provided by an embodiment of the present invention. This embodiment can be applied to electrical equipment that requires different voltage specifications or different plug specifications. The power supply connection device can be configured in a welding machine test device or other electrical equipment test device. Figure 1As shown, the power connection device includes: a socket box 101 and at least two power supply lines 102; the socket box 101 is provided with multiple groups of jacks 1011, and the socket box 101 is provided with conductive electrodes 1012, which are arranged on one side of the jacks; a power input end 1021 of the power supply line 102 is used to receive the supply voltage, and a power output end 1023 of the power supply line 102 is electrically connected to the conductive electrode 1012; a switch module 1022 is provided in the power supply line, and the switch module 1022 is used to control the conductive state between the power input end 1021 and the power output end 1023; wherein the supply voltages of at least two power supply lines 102 are different.

[0031] Specifically, socket box 101 is provided with multiple groups of jacks 1011, where different groups of jacks can be used to connect plugs of different specifications, allowing socket box 101 to accommodate plugs of different specifications. Multiple groups of jacks 1011 provide different plug connection points, allowing plugs from multiple electrical appliances or devices to be connected to the socket box simultaneously. The layout and number of jacks can be designed based on actual needs. The multiple groups of jacks 1011 may include at least one group of two-prong jacks and / or at least one group of three-prong jacks.

[0032] The socket box 101 is provided with a conductive electrode 1012 for conducting electrical signals. Conductive electrode 1012 is disposed on one side of the socket so that when a plug is inserted into the socket, it can be electrically connected to conductive electrode 1012. Conductive electrode 1012 is electrically connected via power output terminal 1023 of power supply circuit 102. Power input terminal 1021 of power supply circuit 102 is connected to an external power supply voltage. This external power supply voltage can be transmitted via power supply circuit 102 to conductive electrode 1012, and then to the plug connected to conductive electrode 1012, thereby ensuring that current can be effectively transferred from power supply circuit 102 to the device connected to the plug in the socket. The external power supply voltage can be provided by the power grid or a transformer, and accordingly, power input terminal 1021 can be connected to the power grid or the transformer.

[0033] In this embodiment, a switch module 1022 is provided in the power supply circuit 102 for controlling the current conduction state between the power supply input terminal 1021 and the power supply output terminal 1023. The switch module 1022 may include at least one switching device, including but not limited to a circuit breaker and / or a relay. In this embodiment, the supply voltages of at least two power supply circuits 102 are different. By providing the switch module 1022 in the power supply circuit 102, different switch modules 1022 can be selected to conduct according to the power supply voltage required by the electrical device connected to the socket box 101, thereby providing the required power supply voltage to the electrical device. In this way, the socket box 101 of the power connection device can be adapted to electrical devices with different voltage specifications.

[0034] Specifically, when supplying power to an electrical device through the power supply connection device, the plug of the electrical device can be inserted into a corresponding socket on the socket box 101 that matches the plug of the electrical device, so that the plug of the electrical device is electrically connected to the conductive electrode 1012; the power input end 1021 of the power supply circuit 102 is connected to the supply voltage, and at least two power supply circuits 102 are connected to different supply voltages. Based on the supply voltage required by the electrical device, the switch module 1022 in the corresponding power supply circuit is selected to be conductive, providing the electrical device with a supply voltage of the corresponding specification. For example, the electrical device can be an electric welder, and the process of the power supply connection device supplying power to the electrical device can include a test process of the electric welder.

[0035] The power supply connection device of this embodiment is conducive to achieving compatible matching of plugs of different specifications by providing multiple groups of jacks on the socket box. By providing at least two power supply lines, the power supply input end of the power supply line is connected to the power supply voltage, and the output end of the power supply line is electrically connected to the conductive electrode in the socket box, so that when a plug is inserted into the jack, the power supply voltage can be connected through the conductive electrode and the power supply line. The power supply voltages of at least two power supply lines are different, and a switch module is provided in the power supply line. When different switch modules are turned on, different power supply voltages can be provided to the electrical equipment, thereby enabling the socket box of the power supply connection device to adapt to electrical equipment of different voltage specifications. Therefore, the power supply connection device of this embodiment can match plugs of different specifications and / or electrical equipment with different voltage requirements, reduce the occupation of production resources, improve production efficiency, and reduce the complexity of operation and the risk of errors.

[0036] Figure 2 This is a circuit diagram of another power supply connection device provided by an embodiment of the present utility model, referring to Figure 2 In some optional embodiments of the present invention, the switch module 201 includes:

[0037] Switch power supply input terminal, push button switch SB1, relay and AC contactor

[0038] The relay includes a first coil KT1-1 and a first switch contact KT1-2. The first coil KT1-1 and the push button switch SB1 are connected in series to the switch power supply input end; the AC contactor includes a second coil KG1-1 and a second switch contact KG1-2. The second coil KG1-1 and the first switch contact KT1-2 are connected in series between the live wire L11 and the neutral wire N1 of the power supply line; the second switch contact KG1-2 is connected in series between the power supply input end and the power supply output end; the second switch contact KG1-2 is a normally open contact.

[0039] Specifically, the switch power supply input terminal may include a positive input terminal VCC1 and a negative input terminal VEE1, which serve as the power input terminal of the switch module and are connected to the power supply. A push button switch SB1 is used to control the operating state of the switch module. Users can use the push button switch to turn the relay and AC contactor on or off, thereby controlling the conduction state of the power supply circuit. The relay's first coil KT1-1 is connected in series with the push button switch SB1, connected to the positive input terminal VCC1 and the negative input terminal VEE1. When the push button switch SB1 is closed, current flows through the first coil KT1-1, actuating the first switch contact KT1-2, thereby changing the state of the first switch contact KT1-2. The AC contactor's second coil KG1-1 is connected in series with the first switch contact KT1-2, located between the live wire L11 and the neutral wire N1 of the power supply circuit. The second switch contact KG1-2 is connected in series between the power supply input terminal and the power supply output terminal. The second switch contact KG1-2 is a normally open contact, meaning that if the second coil KG1-1 loses power, the second switch contact KG1-2 is open. When the second coil KG1 - 1 is energized, the second switch contact KG1 - 2 is closed, thereby allowing current to flow from the power supply input terminal to the power supply output terminal.

[0040] In some optional embodiments of the present invention, the relay includes a time relay, and the first switch contact KT1-2 is a normally closed contact; the time relay is used to start timing after the first coil KT1-1 is energized, and to disconnect the first switch contact KT1-2 after the timing reaches a set time.

[0041] Specifically, the time relay provides a delay control function, which can delay the circuit from being disconnected for a set time after the first coil KT1-1 is energized. The first switch contact KT1-2 ensures that it remains in a normally closed state within the set time after the time relay is energized, so that the second coil KG1-1 of the AC contactor is in the energized state. The corresponding second switch contact KG1-2 is closed, allowing the supply voltage to be transmitted to the conductive electrodes of the socket box through the power supply line, thereby powering the electrical device. Only after the timing reaches the set time, the first switch contact KT1-2 is disconnected, the AC contactor is disconnected, and the input power of the electrical device is disconnected. For example, the electrical device can be an electric welder, and the delay control process of the time relay can be used in the testing process of the electric welder. That is, when testing the electric welder, the set time length can be set according to the time required to test the electric welder, and the set time length is equal to the duration of the electric welder test.

[0042] In some optional embodiments of the present invention, the power supply connection device further includes at least two circuit breakers CD1 , each power supply line is provided with at least one circuit breaker CD1 , and the circuit breaker CD1 is connected in series with the second switch contact KG1 - 2 .

[0043] Specifically, each power supply circuit is equipped with at least one circuit breaker CD1. This circuit breaker CD1 is designed to automatically disconnect the circuit in the event of a fault or overload, protecting the circuit and equipment from damage. Each circuit breaker CD1 is connected in series with the second switch contact KG1-2, ensuring that the circuit breaker CD1 can effectively protect the corresponding power supply circuit when the switch module 201 controls the circuit.

[0044] In some optional embodiments of the present invention, the power supply connection device includes at least two connectors 202 . The connectors 202 are connected to the power supply output end, and the connectors 202 are electrically connected to the power supply lines in a one-to-one correspondence.

[0045] Specifically, connector 202 is used to connect stripped wires. To use connector 202, the insulation of the wires is stripped to expose the conductors. The conductors are then inserted into connector 202 and securely connected using a fastening device or crimping to ensure smooth current flow. By including connector 202 in the power supply connection device, the power supply connection device can be adapted for use with electrical devices connected to a power supply via stripped wires, further meeting the needs of diverse electrical devices and expanding the application scenarios of the power supply connection device.

[0046] Continue to refer Figure 2 In some embodiments of the present invention, at least one group of jacks DJ1 in the power connection device includes: a live wire jack, a neutral wire jack, and a ground wire jack; the conductive electrodes include: a first conductive electrode A, a second conductive electrode B, and a third conductive electrode C, the first conductive electrode A is arranged on one side of the live wire jack, the second conductive electrode B is arranged on one side of the neutral wire jack, and the third conductive electrode C is arranged on one side of the ground wire jack; the power input terminals include: a first phase input terminal A11, a second phase input terminal A12, a third phase input terminal A13, and a neutral wire input terminal B11. The power supply output terminal includes: a first phase output terminal A1, a second phase output terminal A2, a third phase output terminal A3, and a neutral line output terminal B1; the first phase input terminal A11 is electrically connected to the first phase output terminal A1 through the switch module 201, the second phase input terminal A12 is electrically connected to the second phase output terminal A2 through the switch module 201, the third phase input terminal A13 is electrically connected to the third phase output terminal A3 through the switch module 201, and the neutral line input terminal B11 is electrically connected to the neutral line output terminal B1; the first phase output terminal A1 is electrically connected to the first conductive electrode A, the neutral line output terminal B1 is electrically connected to the second conductive electrode B, and the third conductive electrode C is grounded GND;

[0047] Specifically, at least one set of jacks provides access points for live, neutral, and ground wires, suitable for standard power connections. The conductive electrodes make contact with the plug, allowing current to enter the conductive electrodes from the power source and further transmit to the power-consuming device.

[0048] Continue to refer Figure 2In some embodiments of the present invention, the connector 202 includes a switch group, which includes a first switch CK1-1, a second switch CK1-2, a third switch CK1-3, and a fourth switch CK1-4. The first switch CK1-1 is electrically connected to the first phase output terminal A1, the second switch CK1-2 is electrically connected to the second phase output terminal A2, the third switch CK1-3 is electrically connected to the third phase output terminal A3, and the fourth switch CK1-4 is electrically connected to the neutral line output terminal B1.

[0049] Specifically, the switch group connects power outputs of different phases through each switch. The switch group is used to connect the stripped wires. The first switch CK1-1 is electrically connected to the first-phase output terminal A1 to enable first-phase power output. The second switch CK1-2 is electrically connected to the second-phase output terminal A2 to enable second-phase power output. The third switch CK1-3 is electrically connected to the third-phase output terminal A3 to enable third-phase power output. The fourth switch CK1-4 is electrically connected to the neutral line output terminal B1 to enable neutral line power output. The switch group can achieve power output of different phases.

[0050] The power input terminal is configured for single-phase and three-phase power input. Single-phase input consists of a live wire and a neutral wire. Three-phase power consists of three live wires and a neutral wire. Single-phase power is used for daily power supply in homes and small businesses, connecting most household appliances such as refrigerators, televisions, and computers. Three-phase power is primarily used for high-power equipment such as industrial equipment, heavy machinery, and large air conditioning systems. In this embodiment, the power connection device can connect to three-phase electrical devices via a connector 202 and to single-phase electrical devices via a socket box.

[0051] Figure 3 This is an exploded view of the power supply connection device provided by an embodiment of the utility model. Figure 4 This is a front view of the power supply connection device provided by an embodiment of the utility model. Figure 5 This is a bottom view of the power supply connection device provided by an embodiment of the utility model. Figure 6 This is a top view of the power supply connection device provided by an embodiment of the utility model. Figure 7 This is a right side view of the power supply connection device provided by an embodiment of the utility model. Figure 8 This is a left side view of the power supply connection device provided by an embodiment of the utility model. Figure 9 This is an axial diagram of the power supply connection device provided by the embodiment of the present utility model. Figure 3-Figure 9 In some embodiments of the present invention, different groups of jacks have different jack arrangements, different jack shapes, or different jack sizes.

[0052] Specifically, different outlet box configurations feature different arrangements of jacks. For example, the jacks can be arranged in rows, columns, or diagonally. This allows for adaptability to different plug types and connection requirements. The jacks come in different shapes, such as round, square, and rectangular, to accommodate plugs of varying sizes. This improves the compatibility of the outlet box and supports the connection of a wide variety of devices. The jacks come in different sizes to accommodate different plug types, enabling the outlet box to support devices of varying current ratings and power levels.

[0053] refer to Figure 3 In some embodiments of the present invention, the socket box includes: an upper box body 1 and a lower box body 3, which are fixedly connected; a first positioning column 5 is provided on the side of the upper box body 1 close to the lower box body 3, and a second positioning column 6 is provided on the side of the lower box body close to the upper box body; the conductive electrode 9 is fixed by the first positioning column 5 and the second positioning column 6.

[0054] Specifically, the upper and lower housings 1 and 3 together form the overall structure of the socket box, providing stable support and protection. The first and second locating posts 5 and 6 are used to precisely position and secure the conductive electrode 9, ensuring stability and proper positioning within the socket box. The conductive electrode 9 is secured by the first and second locating posts 5 and 6, ensuring stability and a reliable electrical connection, preventing movement or loosening during use. The fixed connection between the upper and lower housings ensures reliable contact with plugs of varying sizes.

[0055] Continue to refer Figure 3 The power supply connection device also includes: a switch button 2, an insulating panel 4, a connector 7, a relay 8, a right side panel 10, a fixing plate 11, a circuit breaker 12, a circuit breaker fixing plate 13, a contactor 14, a main board 15, a left side panel 16, an electrical guide rail 17, and a cover plate 18.

[0056] Specifically, the insulating panel 4 is used to isolate conductive parts to ensure the safety of equipment and personnel. The right side panel 10 is a panel on the right side of the device, used to protect internal components and provide side enclosure. The fixing plate 11 is a plate-like structure used to fix each component to ensure that each component can be firmly installed in the appropriate position. The circuit breaker fixing plate 13 is used to fix the circuit breaker. The main board 15 is a panel for fixing various components thereon. The left side panel 16 is a panel on the left side of the device, used to protect internal components and provide side enclosure. The electrical rail 17 is used to install and fix various electrical equipment and components. The cover plate 18 is a covering plate on the front of the device, used to close the top of the device and provide overall structural integrity. The switch button 2, connector 7, relay 8, circuit breaker 12 and contactor 14 are described in the above embodiments and will not be repeated here.

[0057] An embodiment of the present invention also provides an electric welding machine testing device, which can execute the power supply connection device provided by any embodiment of the present invention and has functional modules and beneficial effects corresponding to the execution method.

[0058] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this utility model can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this utility model can be achieved. This is not limited herein.

[0059] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A power supply connection device, characterized in that: include: Socket box and at least two power supply lines; The socket box is provided with a plurality of sockets, and a conductive electrode is provided in the socket box, and the conductive electrode is provided on one side of the sockets; The power supply input end of the power supply circuit is used to access the power supply voltage, and the power supply output end of the power supply circuit is connected to the conductive electrode; a switch module is provided in the power supply circuit, and the switch module is used to control the conduction state between the power supply input end and the power supply output end; wherein the supply voltages of at least two of the power supply circuits are different.

2. The power supply connection device according to claim 1, characterized in that: The switch module includes: a switch power supply access terminal, a push button switch, a relay and an AC contactor; The relay comprises a first coil and a first switch contact, wherein the first coil and the button switch are connected in series to the switch power supply access terminal; The AC contactor includes a second coil and a second switch contact, the second coil and the first switch contact are connected in series between the live wire and the neutral wire of the power supply circuit; the second switch contact is connected in series between the power supply input end and the power supply output end; the second switch contact is a normally open contact.

3. The power supply connection device according to claim 2, characterized in that: The relay includes a time relay, and the first switch contact is a normally closed contact; the time relay is used to start timing after the first coil is energized, and to disconnect the first switch contact after the timing reaches a set time.

4. The power supply connection device according to claim 2, characterized in that: It also includes at least two circuit breakers, with at least one circuit breaker being provided in each power supply line, and the circuit breaker being connected in series with the second switch contact.

5. The power supply connection device according to any one of claims 1 to 4, comprising at least two connectors, wherein the connectors are connected to the power supply output end, and the connectors are electrically connected to the power supply lines in a one-to-one correspondence.

6. The power supply connection device according to claim 5, wherein at least one group of the jacks includes a live wire jack, a neutral wire jack, and a ground wire jack; the conductive electrodes include a first conductive electrode, a second conductive electrode, and a third conductive electrode, wherein the first conductive electrode is disposed on one side of the live wire jack, the second conductive electrode is disposed on one side of the neutral wire jack, and the third conductive electrode is disposed on one side of the ground wire jack; The power supply input terminal includes a first phase input terminal, a second phase input terminal, a third phase input terminal and a neutral line input terminal, and the power supply output terminal includes a first phase output terminal, a second phase output terminal, a third phase output terminal and a neutral line output terminal; The first phase input terminal is electrically connected to the first phase output terminal through the switch module, the second phase input terminal is electrically connected to the second phase output terminal through the switch module, the third phase input terminal is electrically connected to the third phase output terminal through the switch module, and the neutral line input terminal is electrically connected to the neutral line output terminal; The first phase output terminal is electrically connected to the first conductive electrode, the neutral line output terminal is electrically connected to the second conductive electrode, and the third conductive electrode is grounded; The connector is electrically connected to the first phase output terminal, the second phase output terminal, the third phase output terminal and the neutral line output terminal respectively.

7. The power supply connection device according to claim 6, characterized in that: The connector includes a switch group, which includes a first switch, a second switch, a third switch and a fourth switch. The first switch is electrically connected to the first phase output terminal, the second switch is electrically connected to the second phase output terminal, the third switch is electrically connected to the third phase output terminal, and the fourth switch is electrically connected to the neutral line output terminal.

8. The power supply connection device according to claim 1, characterized in that: The sockets in different groups have different socket arrangements, different socket shapes, or different socket sizes.

9. The power supply connection device according to claim 1, characterized in that: The socket box includes an upper box body and a lower box body, and the upper box body and the lower box body are fixedly connected; a first positioning column is provided on the side of the upper box body close to the lower box body, and a second positioning column is provided on the side of the lower box body close to the upper box body; the conductive electrode is fixed by the first positioning column and the second positioning column.

10. A welding machine testing device, characterized in that: The invention comprises the power supply connection device according to any one of claims 1 to 9.

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