Safety locking device and contact network grounding management and control system

Abstract

The utility model provides a safety locking device and a contact network grounding management and control system, and relates to the technical field of contact network safety. In the application, the safety locking device comprises: a housing structure; the first circuit board is arranged in the shell structure, an interface circuit and a signal isolation circuit are arranged on the first circuit board, the interface circuit is connected with the signal isolation circuit, and the interface circuit is used for being connected with external control equipment; the second circuit board is arranged in the shell structure, a processor and a relay are arranged on the second circuit board, the processor is connected with the signal isolation circuit and the relay, and the relay is used for controlling the external switch to be in a closed state or a closed state; and the indicating device is arranged on the surface of the shell structure, is connected with the processor and is used for indicating the running state. Based on the above content, the problem that in the prior art, the safety of controlling an isolating switch or a grounding switch in a contact network grounding management and control system is not high can be solved.

Description

Technical Field

[0001] The present application relates to the field of contact network safety technology, and in particular to a safety locking device and a contact network grounding control system. Background Art

[0002] In the application of urban rail transit, the overhead contact network plays an important role as a power supply facility. In the operation and maintenance of the overhead contact network, it is necessary to control the status of devices such as grounding switches and disconnecting switches. For example, the disconnecting switch can only be closed when there is no grounding wire and the grounding switch is in the open state; the grounding wire can be hung or the grounding switch can be closed only when the disconnecting switch is in the open state; the corresponding area can only be entered for operation when the disconnecting switch is in the open state and there is a grounding wire or the grounding switch is in the closed state. However, the inventors have found that in the existing overhead contact network grounding control system, there is a problem of low safety in controlling the disconnecting switch or the grounding switch. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a safety locking device and a contact network grounding control system to improve the problem of low safety in controlling the isolating switch or the grounding switch in the contact network grounding control system in the prior art.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] A safety locking device is applied to a contact network grounding control system, wherein the contact network grounding control system further includes an isolating switch and a grounding switch, and the safety locking device includes:

[0006] A shell structure having a receiving space;

[0007] A first circuit board is arranged in the housing structure, wherein an interface circuit and a signal isolation circuit are arranged on the first circuit board, the interface circuit is connected to the signal isolation circuit, the interface circuit is used to connect to an external control device, and the signal isolation circuit is used to isolate and output a first control signal sent by the external control device and received by the interface circuit;

[0008] A second circuit board is arranged in the housing structure, wherein a processor and a relay are arranged on the second circuit board, the processor is connected to the signal isolation circuit and the relay respectively, the processor is used to receive a second control signal output by the signal isolation circuit for isolating the first control signal, and the relay is used to control the connected external switch in response to the second control signal, so that the external switch is in a closed state or an off state, and the external switch belongs to an isolating switch or a grounding switch in the contact network grounding control system;

[0009] An indicator device is arranged on the surface of the shell structure, wherein the indicator device is connected to the processor, and the indicator is used to indicate the operating status based on the control of the processor.

[0010] In a preferred option of the present application, in the above-mentioned safety locking device, a cascade power supply circuit is also provided on the first circuit board, wherein the cascade power supply circuit includes at least two cascade-connected power supply units, and the at least two cascade-connected power supply units are respectively connected to the signal isolation circuit and the processor, and the at least two cascade-connected power supply units are used to isolate and protect the power supply of the connected external power supply and then output it to the signal isolation circuit and the processor, so as to power the signal isolation circuit and the processor respectively.

[0011] In a preferred embodiment of the present application, in the above safety locking device, the at least two cascade-connected power supply units include:

[0012] a first power supply unit, wherein an input end of the first power supply unit is used to be connected to an external power supply, an output end of the first power supply unit is connected to a power supply end of the processor, and the first power supply unit is used to adjust a voltage of the external power supply to a target voltage to supply power to the processor;

[0013] A second power supply unit, wherein the input end of the second power supply unit is connected to the output end of the first power supply unit, the output end of the second power supply unit is connected to the power supply end of the signal isolation circuit, and the second power supply unit is used to stabilize the voltage of the output end of the first power supply unit and then supply power to the signal isolation circuit.

[0014] In a preferred embodiment of the present application, in the above safety locking device, the first power supply unit includes:

[0015] A first power supply module, wherein the first power supply module belongs to a DC-DC converter, and the first power supply module has a first input pin, a first input ground pin, a first output pin and a first output ground pin, the first input pin is connected to the external power supply, the first input ground pin and the first output ground pin are grounded respectively, and the first output pin is connected to the power supply end of the processor;

[0016] A first capacitor, wherein a first end of the first capacitor is connected to the first input pin, and a second end of the first capacitor is connected to the first input ground pin;

[0017] A second capacitor, wherein a first end of the second capacitor is connected to the first output pin, and a second end of the second capacitor is connected to the second output ground pin;

[0018] a third capacitor, wherein a first end of the third capacitor is connected to the first output pin, and a second end of the third capacitor is connected to the second output ground pin;

[0019] Furthermore, the second power supply unit includes:

[0020] A second power supply module, wherein the second power supply module belongs to a DC-DC converter, and the second power supply module has a second input pin, a second input ground pin, a second output pin, and a second output ground pin, the second input pin is connected to the first output pin, the second input ground pin and the second output ground pin are grounded respectively, and the second output pin is connected to the power supply end of the signal isolation circuit;

[0021] a fourth capacitor, wherein a first end of the fourth capacitor is connected to the second input pin, and a second end of the fourth capacitor is connected to the second input ground pin;

[0022] a fifth capacitor, wherein a first end of the fifth capacitor is connected to the second output pin, and a second end of the fifth capacitor is connected to the second output ground pin;

[0023] a sixth capacitor, wherein a first end of the sixth capacitor is connected to the second output pin, and a second end of the sixth capacitor is connected to the second output ground pin;

[0024] a seventh capacitor, wherein a first end of the seventh capacitor is connected to the second output pin, and a second end of the seventh capacitor is connected to the second output ground pin;

[0025] an eighth capacitor, wherein a first end of the eighth capacitor is connected to the second output pin, and a second end of the eighth capacitor is connected to the second output ground pin;

[0026] a ninth capacitor, wherein a first end of the ninth capacitor is connected to the second output pin, and a second end of the ninth capacitor is connected to the second output ground pin;

[0027] A first resistor, wherein a first end of the first resistor is connected to the second output pin, and a second end of the first resistor is connected to the second output ground pin.

[0028] In a preferred embodiment of the present application, in the above safety locking device, the housing structure includes:

[0029] A main body structure having a receiving space, wherein the main body structure has a first opening, and the first opening is used to connect the internal receiving space and the external space of the main body structure;

[0030] A mounting panel, wherein the mounting panel is disposed on a side of the main structure having the first opening, and the mounting panel has a second opening corresponding to the first opening;

[0031] A button head and a nut, wherein the nut is located on a side of the mounting panel close to the main structure, the first part of the button head is located on a side of the mounting panel away from the main structure, the second part of the button head passes through the second opening and is threadedly connected to the nut, and the indicating device is arranged on the first part and is connected to a processor located in an internal accommodation space of the main structure through a cable.

[0032] In a preferred option of the present application, in the above-mentioned safety locking device, the first opening is formed by an annular structure, and screws are respectively arranged at multiple positions of the annular structure, and the screws are used to fix the nuts located at the first opening.

[0033] In a preferred option of the present application, in the above safety locking device, the annular structure is provided with two hexagon socket headless screws at two opposite positions in the first direction, and the two hexagon socket headless screws are used to fix the nut in the first direction;

[0034] The annular structure is provided with two hexagon socket headless screws at two opposite positions in the second direction, and the two hexagon socket headless screws are used to fix the nut in the second direction, wherein the second direction is perpendicular to the first direction.

[0035] In a preferred embodiment of the present application, in the above safety locking device, the housing structure further comprises:

[0036] A flat washer, wherein the flat washer is located between the mounting panel and the nut, and the flat washer has an opening, and the second portion of the button head passes through the opening and is connected to the nut;

[0037] A rubber ring, wherein the rubber ring is located between the mounting panel and the first portion of the button head, and the rubber ring has an opening, and the second portion of the button head passes through the opening.

[0038] In a preferred embodiment of the present application, in the above safety locking device, the signal isolation circuit includes a dual-channel standard digital isolator, the model of the dual-channel standard digital isolator is CA-IS3722HS, wherein the dual-channel standard digital isolator includes:

[0039] A first input pin and a first output pin, wherein the first input pin is used to connect to a programmable logic controller included in the external control device, and the programmable logic controller is used to send a control instruction issued by a host computer to a processor connected to the first output pin through the dual-channel standard digital isolator;

[0040] A second input pin and a second output pin, wherein the second input pin is used to connect to a keyboard included in the external control device, and the keyboard is used to send a control instruction generated in response to a user operation to a processor connected to the second output pin through the dual-channel standard digital isolator.

[0041] On the basis of the above, the present application also provides a contact network grounding control system, including:

[0042] Disconnectors and earthing switches;

[0043] The above-mentioned safety locking device, wherein the safety locking device is used to control the isolating switch and the grounding switch to enter the off state or the closed state.

[0044] The safety locking device and contact network grounding control system provided by the present application include: a shell structure; a first circuit board arranged in the shell structure, an interface circuit and a signal isolation circuit are arranged on the first circuit board, the interface circuit is connected to the signal isolation circuit, and the interface circuit is used to connect to an external control device; a second circuit board arranged in the shell structure, a processor and a relay are arranged on the second circuit board, the processor is connected to the signal isolation circuit and the relay respectively, and the relay is used to control the external switch to be in a closed state or an off state; an indicator device arranged on the surface of the shell structure, the indicator device is connected to the processor, and the indicator is used to indicate the operating state. Based on the above content, due to the coordinated setting of the interface circuit, the signal isolation circuit, the processor, the relay and the indicator device, the disconnector or the grounding switch can be remotely reliably controlled, thereby improving the problem of low safety of controlling the disconnector or the grounding switch in the contact network grounding control system in the prior art; in addition, due to the setting of the signal isolation circuit, the anti-electromagnetic interference performance of the safety locking device can be effectively improved, and it has a good application effect for the situation where the electromagnetic environment is very bad in the field of rail transit, which is the basis for the normal operation of the safety locking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings.

[0046] Figure 1 A structural block diagram of the contact network grounding control system provided in an embodiment of the present application.

[0047] Figure 2 A circuit block diagram of the safety locking device provided in an embodiment of the present application.

[0048] Figure 3 A schematic diagram of the structure of the safety locking device provided in an embodiment of the present application.

[0049] Figure 4 A schematic diagram of the upper row of terminals of the safety locking device provided in an embodiment of the present application.

[0050] Figure 5 This is a schematic diagram of the definition of the lower row of terminals of the safety locking device provided in an embodiment of the present application.

[0051] Figure 6 A circuit schematic diagram of the first power supply unit provided in an embodiment of the present application.

[0052] Figure 7 A circuit schematic diagram of a second power supply unit provided in an embodiment of the present application.

[0053] Icon: 1-main structure, 2-installation panel, 3-button head, 4-nut, 5-ring structure, 6-flat washer, 7-rubber ring, U1-first power module, C1-first capacitor, C2-second capacitor, C3-third capacitor, U2-second power module, C4-fourth capacitor, C5-fifth capacitor, C6-sixth capacitor, C7-seventh capacitor, C8-eighth capacitor, C9-ninth capacitor, R1-first resistor. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0056] like Figure 1As shown, an embodiment of the present application provides a contact network grounding control system. The contact network grounding control system may include an isolating switch, a grounding switch and a safety locking device, wherein the safety locking device is used to control the isolating switch and the grounding switch to enter an off state or a closed state. It should be noted that, in some embodiments, there may be two safety locking devices, which respectively control the isolating switch and the grounding switch. In other embodiments, the number of the safety locking devices may be greater, so as to control multiple isolating switches and multiple grounding switches. In addition, in other embodiments, the contact network grounding control system may also include external control devices such as a programmable logic controller, a host computer, and a keyboard, and may also include a sensor for collecting information such as the status of the isolating switch and the grounding switch.

[0057] like Figure 2 and Figure 3 As shown, an embodiment of the present application provides a safety locking device, which can be applied to the above-mentioned contact network grounding control system.

[0058] The safety locking device may include a housing structure, a first circuit board, a second circuit board and an indicator. The housing structure has a receiving space, and the first circuit board and the second circuit board are both arranged inside the housing structure, i.e., the receiving space. The indicator is arranged on the surface of the housing structure.

[0059] In detail, an interface circuit and a signal isolation circuit are provided on the first circuit board, the interface circuit is connected to the signal isolation circuit, the interface circuit is used to connect to an external control device, and the signal isolation circuit is used to isolate and output the first control signal sent by the external control device received by the interface circuit. Exemplarily, the interface circuit and the signal isolation circuit can both be one-way, or two-way or more-way, and no specific limitation is made here. For example, one-way can be used to connect to a host computer, and one-way can be used to connect to a keyboard.

[0060] In detail, a processor and a relay are provided on the second circuit board, and the processor is connected to the signal isolation circuit and the relay respectively. The processor is used to receive a second control signal output by the signal isolation circuit for isolating the first control signal, and the relay is used to control the connected external switch in response to the second control signal, so that the external switch is in a closed state or an off state, and the external switch belongs to an isolating switch or a grounding switch in the contact network grounding control system.

[0061] In detail, the indicating device is connected to the processor, and the indicator is used to indicate the operating status based on the control of the processor. For example, the indicating device may include an operating indicator light, a locking indicator light, a peripheral warning light, and a communication warning light. Exemplarily, the operating indicator light, the locking indicator light, the peripheral warning light, and the communication warning light may all be LEDs. In addition, the operating indicator light may flash periodically after the processor is powered on normally. The locking indicator light may light up red after the external switch is closed. The peripheral warning light may flash yellow when there is a communication failure with an external control device such as a keyboard. The communication warning light may flash yellow when there is a communication failure with an external control device such as a host computer.

[0062] Based on the above content, due to the coordinated setting of the interface circuit, signal isolation circuit, processor, relay and indicator device, the disconnector or grounding switch can be remotely and reliably controlled, thereby improving the problem of low safety in controlling the disconnector or grounding switch in the contact network grounding control system in the prior art, and avoiding safety accidents caused by manual control. In addition, due to the setting of the signal isolation circuit, the anti-electromagnetic interference performance of the safety locking device can be effectively improved, which has a good application effect for the situation of very harsh electromagnetic environment in the field of rail transit, and is the basis for the normal operation of the safety locking device.

[0063] It can be understood that, in an alternative embodiment, the housing structure may include a main structure 1 having an accommodating space, a mounting panel 2 , a button head 3 and a nut 4 .

[0064] In detail, the main structure 1 has a first opening, and the first opening is used to connect the internal storage space and the external space of the main structure 1. The installation panel 2 is arranged on a side of the main structure 1 having the first opening, and the installation panel 2 has a second opening corresponding to the first opening. The nut 4 is located on a side of the installation panel 2 close to the main structure 1, the first part of the button head 3 is located on a side of the installation panel 2 away from the main structure 1, the second part of the button head 3 passes through the second opening and is threadedly connected to the nut 4, and the indicating device is arranged on the first part and is connected to the processor located in the internal storage space of the main structure 1 through a cable.

[0065] It is understandable that in an alternative embodiment, the upper and lower 6-position wiring terminals on one surface of the main structure 1 can realize 2-way RS485 communication, 1-way relay C-type node output, and 2-way open input (such as information input collected by sensors). Among them, the definition of the upper row of terminals is as follows Figure 4 , the definition of the lower row terminals is as follows Figure 5shown.

[0066] It is understandable that, in an alternative embodiment, the first opening is formed by an annular structure 5 (such as a circular annular structure), and screws are respectively provided at multiple positions of the annular structure 5, and the screws are used to fix the nut 4 located at the first opening.

[0067] It is understandable that, in an alternative embodiment, the annular structure 5 is provided with two hexagon socket headless screws (the size model may be M4) at two opposite positions in the first direction, and the two hexagon socket headless screws are used to fix the nut 4 in the first direction. The annular structure 5 is provided with two hexagon socket headless screws at two opposite positions in the second direction, and the two hexagon socket headless screws are used to fix the nut 4 in the second direction, wherein the second direction is perpendicular to the first direction.

[0068] It can be understood that, in an alternative embodiment, the housing structure may further include a flat gasket 6 and a rubber ring 7 .

[0069] In detail, the flat washer 6 is located between the mounting panel 2 and the nut 4, and has an opening on the flat washer 6, through which the second portion of the button head 3 passes to connect with the nut 4. The rubber ring 7 is located between the mounting panel 2 and the first portion of the button head 3, and has an opening on the rubber ring 7, through which the second portion of the button head 3 passes.

[0070] It is understandable that, in an alternative implementation, the interface protocol type of the interface circuit may be RS485 (a standard serial communication protocol).

[0071] It can be understood that, in an alternative embodiment, the signal isolation circuit may include a dual-channel standard digital isolator, the model of the dual-channel standard digital isolator is CA-IS3722HS, wherein the dual-channel standard digital isolator includes a first input pin, a first output pin, a second input pin and a second output pin.

[0072] In detail, the first input pin is used to connect to a programmable logic controller included in the external control device, and the programmable logic controller is used to send the control instructions issued by the host computer to the processor connected to the first output pin through the dual-channel standard digital isolator. The second input pin is used to connect to a keyboard included in the external control device, and the keyboard is used to send the control instructions generated in response to user operations to the processor connected to the second output pin through the dual-channel standard digital isolator.

[0073] It can be understood that, in an alternative implementation, a cascade power supply circuit is also provided on the first circuit board.

[0074] In detail, the cascade power supply circuit includes at least two cascade-connected power supply units, and the at least two cascade-connected power supply units are respectively connected to the signal isolation circuit and the processor. The at least two cascade-connected power supply units are used to isolate and protect the power supply of the connected external power supply and then output it to the signal isolation circuit and the processor to power the signal isolation circuit and the processor respectively.

[0075] It can be understood that, in an alternative implementation, the at least two cascade-connected power supply units include a first power supply unit and a second power supply unit.

[0076] In detail, the input end of the first power supply unit is used to connect to an external power supply, the output end of the first power supply unit is connected to the power supply end of the processor, and the first power supply unit is used to adjust the voltage of the external power supply to a target voltage to supply power to the processor. The input end of the second power supply unit is connected to the output end of the first power supply unit, the output end of the second power supply unit is connected to the power supply end of the signal isolation circuit, and the second power supply unit is used to stabilize the voltage at the output end of the first power supply unit before supplying power to the signal isolation circuit. Based on this, the power supply voltage requirements for the processor and the signal isolation circuit can be fully guaranteed, and the problem of safety accidents caused by signal processing failures due to voltage fluctuations can be avoided.

[0077] It is understood that in an alternative embodiment, in combination with Figure 6 The first power supply unit includes a first power supply module U1, a first capacitor C1, a second capacitor C2 and a third capacitor C3.

[0078] In detail, the first power module U1 belongs to a DC-DC converter, and the first power module U1 has a first input pin, a first input ground pin, a first output pin and a first output ground pin, the first input pin is connected to the external power supply, the first input ground pin and the first output ground pin are grounded respectively, and the first output pin is connected to the power supply end of the processor. The first end of the first capacitor C1 is connected to the first input pin, and the second end of the first capacitor C1 is connected to the first input ground pin. The first end of the second capacitor C2 is connected to the first output pin, and the second end of the second capacitor C2 is connected to the second output ground pin. The first end of the third capacitor C3 is connected to the first output pin, and the second end of the third capacitor C3 is connected to the second output ground pin.

[0079] It is understandable that, in an alternative embodiment, the model of the first power module U1 may be F1205S-2WR3, the parameter of the first capacitor C1 may be 1uF / 50V, the parameter of the second capacitor C2 may be 1uF / 16V, and the parameter of the third capacitor C3 may be 0.1uF.

[0080] It is understood that in an alternative embodiment, in combination with Figure 7 The second power supply unit includes a second power supply module U2, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9 and a first resistor R1.

[0081] In detail, the second power supply module U2 belongs to a DC-DC converter, and the second power supply module U2 has a second input pin, a second input ground pin, a second output pin and a second output ground pin, the second input pin is connected to the first output pin, the second input ground pin and the second output ground pin are grounded respectively, and the second output pin is connected to the power supply end of the signal isolation circuit. The first end of the fourth capacitor C4 is connected to the second input pin, and the second end of the fourth capacitor C4 is connected to the second input ground pin. The first end of the fifth capacitor C5 is connected to the second output pin, and the second end of the fifth capacitor C5 is connected to the second output ground pin. The first end of the sixth capacitor C6 is connected to the second output pin, and the second end of the sixth capacitor C6 is connected to the second output ground pin. The first end of the seventh capacitor C7 is connected to the second output pin, and the second end of the seventh capacitor C7 is connected to the second output ground pin. The first end of the eighth capacitor C8 is connected to the second output pin, and the second end of the eighth capacitor C8 is connected to the second output ground pin. The first end of the ninth capacitor C9 is connected to the second output pin, and the second end of the ninth capacitor C9 is connected to the second output ground pin. A first end of the first resistor R1 is connected to the second output pin, and a second end of the first resistor R1 is connected to the second output ground pin.

[0082] It can be understood that, in an alternative embodiment, the model of the second power supply module U2 can be F0505S-1WR3, the parameter of the fourth capacitor C4 can be 1uF / 50V, the parameter of the fifth capacitor C5 can be 10uF / 16V, the parameter of the sixth capacitor C6 can be 0.1uF, the parameter of the seventh capacitor C7 can be 0.1uF / 50V, the parameter of the eighth capacitor C8 can be 0.1uF / 50V, and the parameter of the ninth capacitor C9 can be 0.1uF / 50V.

[0083] In summary, the safety locking device and contact network grounding control system provided by the present application include: a housing structure; a first circuit board arranged in the housing structure, an interface circuit and a signal isolation circuit are arranged on the first circuit board, the interface circuit is connected to the signal isolation circuit, and the interface circuit is used to connect to an external control device; a second circuit board arranged in the housing structure, a processor and a relay are arranged on the second circuit board, the processor is connected to the signal isolation circuit and the relay respectively, and the relay is used to control the external switch to be in a closed state or an off state; an indicator device arranged on the surface of the housing structure, the indicator device is connected to the processor, and the indicator is used to indicate the operating state. Based on the above content, due to the coordinated setting of the interface circuit, the signal isolation circuit, the processor, the relay and the indicator device, the disconnector or the grounding switch can be remotely reliably controlled, thereby improving the problem of low safety of controlling the disconnector or the grounding switch in the contact network grounding control system in the prior art, and avoiding safety accidents caused by manual control. In addition, due to the setting of the signal isolation circuit, the anti-electromagnetic interference performance of the safety locking device can be effectively improved, and it has a good application effect for the situation where the electromagnetic environment in the field of rail transit is very harsh, which is the basis for the normal operation of the safety locking device.

[0084] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A safety locking device, characterized in that: Applied to the overhead contact network grounding control system, the overhead contact network grounding control system also includes an isolating switch and a grounding switch, and the safety locking device includes: A shell structure having a receiving space; A first circuit board is arranged in the housing structure, wherein an interface circuit and a signal isolation circuit are arranged on the first circuit board, the interface circuit is connected to the signal isolation circuit, the interface circuit is used to connect to an external control device, and the signal isolation circuit is used to isolate and output a first control signal sent by the external control device and received by the interface circuit; A second circuit board is arranged in the housing structure, wherein a processor and a relay are arranged on the second circuit board, the processor is connected to the signal isolation circuit and the relay respectively, the processor is used to receive a second control signal output by the signal isolation circuit for isolating the first control signal, and the relay is used to control the connected external switch in response to the second control signal, so that the external switch is in a closed state or an off state, and the external switch belongs to an isolating switch or a grounding switch in the contact network grounding control system; An indicator device is arranged on the surface of the shell structure, wherein the indicator device is connected to the processor, and the indicator is used to indicate the operating status based on the control of the processor.

2. The safety locking device according to claim 1, characterized in that: A cascade power supply circuit is also provided on the first circuit board, wherein the cascade power supply circuit includes at least two cascade-connected power supply units, and the at least two cascade-connected power supply units are respectively connected to the signal isolation circuit and the processor, and the at least two cascade-connected power supply units are used to isolate and protect the power supply of the connected external power supply and then output it to the signal isolation circuit and the processor to power the signal isolation circuit and the processor respectively.

3. The safety locking device according to claim 2, characterized in that: The at least two cascade-connected power supply units include: a first power supply unit, wherein an input end of the first power supply unit is used to be connected to an external power supply, an output end of the first power supply unit is connected to a power supply end of the processor, and the first power supply unit is used to adjust a voltage of the external power supply to a target voltage to supply power to the processor; A second power supply unit, wherein the input end of the second power supply unit is connected to the output end of the first power supply unit, the output end of the second power supply unit is connected to the power supply end of the signal isolation circuit, and the second power supply unit is used to stabilize the voltage of the output end of the first power supply unit and then supply power to the signal isolation circuit.

4. The safety locking device according to claim 3, characterized in that: The first power supply unit comprises: A first power supply module, wherein the first power supply module belongs to a DC-DC converter, and the first power supply module has a first input pin, a first input ground pin, a first output pin and a first output ground pin, the first input pin is connected to the external power supply, the first input ground pin and the first output ground pin are grounded respectively, and the first output pin is connected to the power supply end of the processor; A first capacitor, wherein a first end of the first capacitor is connected to the first input pin, and a second end of the first capacitor is connected to the first input ground pin; A second capacitor, wherein a first end of the second capacitor is connected to the first output pin, and a second end of the second capacitor is connected to a second output ground pin; a third capacitor, wherein a first end of the third capacitor is connected to the first output pin, and a second end of the third capacitor is connected to the second output ground pin; Furthermore, the second power supply unit includes: A second power supply module, wherein the second power supply module belongs to a DC-DC converter, and the second power supply module has a second input pin, a second input ground pin, a second output pin, and a second output ground pin, the second input pin is connected to the first output pin, the second input ground pin and the second output ground pin are grounded respectively, and the second output pin is connected to the power supply end of the signal isolation circuit; a fourth capacitor, wherein a first end of the fourth capacitor is connected to the second input pin, and a second end of the fourth capacitor is connected to the second input ground pin; a fifth capacitor, wherein a first end of the fifth capacitor is connected to the second output pin, and a second end of the fifth capacitor is connected to the second output ground pin; a sixth capacitor, wherein a first end of the sixth capacitor is connected to the second output pin, and a second end of the sixth capacitor is connected to the second output ground pin; a seventh capacitor, wherein a first end of the seventh capacitor is connected to the second output pin, and a second end of the seventh capacitor is connected to the second output ground pin; an eighth capacitor, wherein a first end of the eighth capacitor is connected to the second output pin, and a second end of the eighth capacitor is connected to the second output ground pin; a ninth capacitor, wherein a first end of the ninth capacitor is connected to the second output pin, and a second end of the ninth capacitor is connected to the second output ground pin; A first resistor, wherein a first end of the first resistor is connected to the second output pin, and a second end of the first resistor is connected to the second output ground pin.

5. The safety locking device according to claim 1, characterized in that: The housing structure comprises: A main body structure having a receiving space, wherein the main body structure has a first opening, and the first opening is used to connect the internal receiving space and the external space of the main body structure; A mounting panel, wherein the mounting panel is disposed on a side of the main structure having the first opening, and the mounting panel has a second opening corresponding to the first opening; A button head and a nut, wherein the nut is located on a side of the mounting panel close to the main structure, the first part of the button head is located on a side of the mounting panel away from the main structure, the second part of the button head passes through the second opening and is threadedly connected to the nut, and the indicating device is arranged on the first part and is connected to a processor located in an internal accommodation space of the main structure through a cable.

6. The safety locking device according to claim 5, characterized in that: The first opening is formed by an annular structure, and screws are respectively arranged at multiple positions of the annular structure, and the screws are used to fix the nuts located at the first opening.

7. The safety locking device according to claim 6, characterized in that: The annular structure is provided with two hexagon socket headless screws at two opposite positions in the first direction, and the two hexagon socket headless screws are used to fix the nut in the first direction; The annular structure is provided with two hexagon socket headless screws at two opposite positions in the second direction, and the two hexagon socket headless screws are used to fix the nut in the second direction, wherein the second direction is perpendicular to the first direction.

8. The safety locking device according to claim 5, characterized in that: The housing structure further comprises: A flat washer, wherein the flat washer is located between the mounting panel and the nut, and the flat washer has an opening, and the second portion of the button head passes through the opening and is connected to the nut; A rubber ring, wherein the rubber ring is located between the mounting panel and the first portion of the button head, and the rubber ring has an opening, and the second portion of the button head passes through the opening.

9. The safety locking device according to claim 1, characterized in that: The signal isolation circuit includes a dual-channel standard digital isolator, the model of the dual-channel standard digital isolator is CA-IS3722HS, wherein the dual-channel standard digital isolator includes: A first input pin and a first output pin, wherein the first input pin is used to connect to a programmable logic controller included in the external control device, and the programmable logic controller is used to send a control instruction issued by a host computer to a processor connected to the first output pin through the dual-channel standard digital isolator; A second input pin and a second output pin, wherein the second input pin is used to connect to a keyboard included in the external control device, and the keyboard is used to send a control instruction generated in response to a user operation to a processor connected to the second output pin through the dual-channel standard digital isolator.

10. A contact network grounding control system, characterized in that: include: Disconnectors and earthing switches; The safety locking device according to any one of claims 1 to 9 is used to control the isolating switch and the grounding switch to enter an off state or a closed state.

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