Opening and closing control circuit and device

Abstract

The utility model relates to a switch-on and switch-off control circuit and device, which are used for locally controlling switch-on and switch-off of a drawer switch, the drawer switch comprises a switch-on coil and a switch-off coil, and the switch-on and switch-off control circuit comprises a switch-on power supply loop, a switch-on control unit, a switch-off power supply loop and a switch-off control unit. The first end of the closing power supply loop is used for connecting an opening-closing coil power supply of the drawer switch, and the second end is used for connecting a power supply end of a closing coil; the switching-on control unit is connected with the switching-on power supply loop and the switching-off power supply loop; the first end of the opening power supply loop is connected with the first end of the closing power supply loop, and the second end is connected with the power supply end of the opening coil; and the opening control unit is connected with the closing power supply loop and the opening power supply loop. The utility model not only can locally control the opening and closing of the drawer switch, but also has the advantages of simple circuit structure and high safety.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant equipment maintenance, in particular to a switch-on and switch-off control circuit and a device. Background Art

[0002] In nuclear power plants, drawer switches are important devices that control the power supply of related equipment. Workers need to regularly inspect and maintain the opening and closing functions of the drawer switches.

[0003] However, the circuit diagram of the opening and closing control circuit of some drawer switches is as follows Figure 1 As shown, when the contact circuit 0010Q of the drawer switch is closed, its closing coil 003XE will be energized to control the corresponding contact circuit to be attracted (the contact is not shown), thereby executing the closing action; similarly, when the contact circuit 002DQ is closed, the drawer switch opening coil 004XB will be energized to control the corresponding contact circuit to be attracted, thereby executing the opening action. Since the contact circuit 0010Q and contact circuit 002DQ of this type of drawer switch are controlled by environmental factors such as temperature, flow, and pressure (for example, the contact circuit 0010Q will not be closed until the temperature reaches a certain value), it is difficult for the staff to perform on-site opening and closing operations on it, and thus it is impossible to understand whether the opening and closing functions of these drawer switches are normal. At present, nuclear power plants are in urgent need of a tool that can perform on-site opening and closing operations on this type of drawer switch. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a switch-on and switch-off control circuit and device.

[0005] The technical solution adopted by the utility model to solve the technical problem is: constructing a switch-on and switch-off control circuit for locally controlling the switch-on and switch-off of a drawer switch, wherein the drawer switch comprises a closing coil and an opening coil, and the switch-on and switch-off control circuit comprises a closing power supply circuit, a closing control unit, an opening power supply circuit and an opening control unit;

[0006] The closing power supply circuit has a first end for connecting to the power supply of the closing and opening coil of the drawer switch, and a second end for connecting to the power supply end of the closing coil;

[0007] The closing control unit is connected to the closing power supply circuit and the opening power supply circuit, and is used to control the closing power supply circuit to be turned on, and prohibit the opening power supply circuit from being turned on when the closing power supply circuit is turned on;

[0008] The opening power supply circuit has a first end connected to the first end of the closing power supply circuit, and a second end connected to the power supply end of the opening coil;

[0009] The opening control unit is connected to the closing power supply circuit and the opening power supply circuit, and is used to control the opening power supply circuit to be connected, and to prohibit the closing power supply circuit from being connected when the opening power supply circuit is connected.

[0010] Preferably, the opening and closing control circuit further includes a closing prompt unit and an opening prompt unit;

[0011] The closing prompt unit is connected in series between the first end and the second end of the closing power supply circuit, and is used to output a prompt signal when the closing power supply circuit is connected;

[0012] The switch-off prompt unit is connected in series between the first end and the second end of the switch-off power supply circuit, and is used to output a prompt signal when the switch-off power supply circuit is connected.

[0013] Preferably, the closing prompt unit comprises a first indicator light L1 and a first buzzer B1; the first indicator light L1 and the first buzzer B1 are respectively connected in series between the first end and the second end of the closing power supply circuit;

[0014] The switch-off prompt unit comprises a second indicator light L2 and a second buzzer B2; the second indicator light L2 and the second buzzer B2 are respectively connected in series between the first end and the second end of the switch-off power supply circuit.

[0015] Preferably, the closing control unit includes a closing button S51 and a first switch unit; the closing button S51 includes a first normally closed circuit and a first normally open circuit;

[0016] The opening control unit includes an opening button S61 and a second switch unit; the opening button S61 includes a second normally closed circuit and a second normally open circuit;

[0017] The first normally closed circuit and the switch circuit of the second switch unit are respectively connected in series between the first end and the second end of the opening power supply circuit, and the second normally closed circuit and the switch circuit of the first switch unit are respectively connected in series between the first end and the second end of the closing power supply circuit;

[0018] The first end of the first normally open circuit is connected to the first end of the closing power supply circuit, and the second end of the first normally open circuit is connected to the control end of the first switch unit, so as to connect the switch circuit of the first switch unit when the closing button S51 is pressed;

[0019] The first end of the second normally open circuit is connected to the first end of the closing power supply circuit, the second end of the second normally open circuit is connected to the control end of the second switch unit, and the switch circuit of the second switch unit is connected when the opening button S61 is pressed.

[0020] Preferably, the first switch unit comprises a first relay K1; the normally open circuit of the first relay K1 is the switch circuit of the first switch unit, the first end of the excitation coil of the first relay K1 is the control end of the first switch unit, and the second end of the excitation coil of the first relay K1 is connected to the second end of the closing power supply circuit;

[0021] The second switch unit includes a second relay K2; the normally open circuit of the second relay K2 is the switch circuit of the second switch unit, the first end of the excitation coil of the second relay K2 is the control end of the second switch unit, and the second end of the excitation coil of the second relay K2 is connected to the second end of the disconnecting power supply circuit.

[0022] Preferably, the closing control unit further comprises a first relay protection unit connected to the excitation coil of the first relay K1 for preventing the first relay K1 from burning out;

[0023] The opening control unit further includes a second relay protection unit connected to the excitation coil of the second relay K2 for preventing the second relay K2 from burning out.

[0024] Preferably, the first relay protection unit comprises a first adjustable resistor U1 and a first capacitor C1; the first end of the excitation coil of the first relay K1 is connected to the second end of the excitation coil of the first relay K1 via the first adjustable resistor U1 and the first capacitor C1;

[0025] The second relay protection unit includes a second adjustable resistor U2 and a second capacitor C2; the first end of the excitation coil of the second relay K2 is connected to the second end of the excitation coil of the second relay K2 via the second adjustable resistor U2 and the second capacitor C2.

[0026] Preferably, the opening and closing control circuit further includes a first current limiting protection unit and a second current limiting protection unit;

[0027] The first current limiting protection unit is connected in series between the first end of the closing power supply circuit and the first end of the first normally open circuit, and the second current limiting protection unit is connected in series between the first end of the opening power supply circuit and the first end of the second normally open circuit;

[0028] The first current limiting protection unit and the second current limiting protection unit respectively include a fuse.

[0029] The utility model also constructs an opening and closing control device for locally controlling the opening and closing of a drawer switch. The drawer switch comprises a closing coil and an opening coil. The opening and closing control device comprises a shell, and the above-mentioned opening and closing control circuit is arranged in the shell.

[0030] Preferably, the opening and closing control device further comprises a first connector and a second connector arranged on the drawer switch side;

[0031] The first end of the first connector is connected to the first end of the closing power supply circuit and the first end of the opening power supply circuit through a cable, the second end of the first connector is connected to the second end of the closing power supply circuit through a cable, and the third end of the first connector is connected to the second end of the opening power supply circuit through a cable;

[0032] The first end of the second connector is used to connect the power supply of the opening and closing coil, the second end of the second connector is used to connect the power supply end of the closing coil, and the third end of the second connector is used to connect the power supply end of the opening coil;

[0033] The first, second and third ends of the first connector are detachably connected to the first, second and third ends of the second connector in sequence.

[0034] The implementation of the utility model has the following beneficial effects: providing an opening and closing control circuit, which can not only control the opening and closing of the drawer switch on-site, but also has the advantages of simple circuit structure and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0036] Figure 1 is a circuit schematic diagram of a closing and opening control circuit of a drawer switch in some embodiments;

[0037] Figure 2 It is a circuit principle diagram of the opening and closing control circuit in some embodiments of the utility model;

[0038] Figure 3 It is a structural diagram of the opening and closing control device in some embodiments of the utility model;

[0039] Figure 4 It is a circuit schematic diagram of the first connector and the second connector in some embodiments of the utility model. DETAILED DESCRIPTION

[0040] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0041] Figure 2 The circuit diagram of the opening and closing control circuit in some embodiments of the utility model is used to control the opening and closing of the drawer switch locally. Figure 1 As shown, the drawer switch includes a closing coil 003XE and an opening coil 004XB. Figure 2 As shown, the opening and closing control circuit includes a closing power supply circuit 1, a closing control unit 2, an opening power supply circuit 3 and an opening control unit 4.

[0042] The first end of the closing power supply circuit 1 is used to connect the closing and opening coil power supply of the drawer switch (see Figure 1 The second end of the closing power supply circuit 1 is used to connect the power supply end of the closing coil 003XE (see Figure 1 The network label in is J2_2).

[0043] The closing control unit 2 is connected to the closing power supply circuit 1 and the opening power supply circuit 3. The closing control unit 2 is used to control the closing power supply circuit 1 to be turned on, and to prohibit the opening power supply circuit 3 from being turned on when the closing power supply circuit 1 is turned on, so as to prevent the opening power supply circuit 3 from being turned on when the closing power supply circuit 1 is turned on, and to avoid the drawer switch from being controlled to close and open at the same time, and to prevent the actuator for controlling the closing and opening from being burned out.

[0044] The first end of the opening power supply circuit 3 is connected to the first end of the closing power supply circuit 1, and the second end of the opening power supply circuit 3 is used to connect the power supply end of the opening coil 004XB (see Figure 1 The network label in is J2_3).

[0045] The opening control unit 4 is connected to the closing power supply circuit 1 and the opening power supply circuit 3. The opening control unit 4 is used to control the opening power supply circuit 3 to be connected, and to prohibit the closing power supply circuit 1 from being connected when the opening power supply circuit 3 is connected, so as to prevent the closing power supply circuit 1 from being connected when the opening power supply circuit 3 is connected, and also to protect the actuator.

[0046] In this embodiment, after the opening and closing control circuit is connected to the controlled drawer switch in the above manner, the staff can control the closing power supply circuit 1 to be turned on through the closing control unit 2, so that the power supply of the opening and closing coil will be input to the power supply end of the closing coil 003XE through the closing power supply circuit 1, thereby exciting the closing coil 003XE, thereby controlling the drawer switch to close. Similarly, when the staff controls the opening power supply circuit 2 to be turned on through the opening control unit 4, the opening coil 004XB will be excited, thereby controlling the opening of the drawer switch, thereby realizing the function of locally controlling the opening and closing of the drawer switch; moreover, the closing control unit 2 and the opening control unit 4 respectively form a mutually restrictive circuit structure with the closing power supply circuit 1 and the opening power supply circuit 3, which can prohibit the closing power supply circuit 1 and the opening power supply circuit 3 from being turned on at the same time, avoid controlling the drawer switch to open and close at the same time, and can effectively prevent the utility model from causing adverse effects on the devices in the controlled drawer switch after being connected, thereby improving safety.

[0047] In some embodiments, Figure 2 As shown, the opening and closing control circuit also includes a closing prompt unit 5 and an opening prompt unit 6.

[0048] Specifically, the closing prompt unit 5 is connected in series between the first end and the second end of the closing power supply circuit 1, and the closing prompt unit 5 is used to output a prompt signal when the closing power supply circuit 1 is connected; the opening prompt unit 6 is connected in series between the first end and the second end of the opening power supply circuit 3, and the opening prompt unit 6 is used to output a prompt signal when the opening power supply circuit 3 is connected.

[0049] In this embodiment, after the staff operates the closing control unit 2 (or the opening control unit 4), they can determine whether the closing power supply circuit 1 (or the opening power supply circuit 3) is connected as operated by the prompt signal output by the closing prompt unit 5 (or the opening prompt unit 6), so that the staff can analyze whether the drawer switch and the opening and closing control circuit are normal. For example, if the closing prompt unit 5 has output the prompt signal as operated, but the drawer switch does not perform the closing action as usual, then the staff can infer that the drawer switch is abnormal. On the contrary, if the prompt signal is not output as operated, the staff can infer that the opening and closing control circuit is abnormal.

[0050] In some embodiments, Figure 2 As shown, the closing prompt unit 5 includes a first indicator light L1 and a first buzzer B1. The first indicator light L1 and the first buzzer B1 are respectively connected in series between the first end and the second end of the closing power supply circuit 1.

[0051] Correspondingly, the opening prompt unit 6 may include a second indicator light L2 and a second buzzer B2. The second indicator light L2 and the second buzzer B2 are respectively connected in series between the first end and the second end of the opening power supply circuit 3.

[0052] In this embodiment, through the combination of the indicator light and the buzzer, the closing prompt unit 5 or the opening prompt unit 6 can output sound and light prompt signals at the same time, which helps to improve the prompt effect.

[0053] In some embodiments, Figure 2 As shown, the closing control unit 2 includes a closing button S51 and a first switch unit 21, wherein the closing button S51 includes a first normally closed circuit and a first normally open circuit. Moreover, the opening control unit 4 includes an opening button S61 and a second switch unit 41, wherein the opening button S61 includes a second normally closed circuit and a second normally open circuit.

[0054] Specifically, the first normally closed circuit of the closing button S51 and the switch circuit of the second switch unit 41 are respectively connected in series between the first end and the second end of the opening power supply circuit 3, and the second normally closed circuit of the opening button S61 and the switch circuit of the first switch unit 21 are respectively connected in series between the first end and the second end of the closing power supply circuit 1. The first end of the first normally open circuit of the closing button S51 is connected to the first end of the closing power supply circuit 1, and the second end of the first normally open circuit of the closing button S51 is connected to the control end of the first switch unit 21. Figure 2 As shown, when the staff presses the closing button S51, the first normally open circuit of the closing button S51 will be closed, so that the control end of the first switch unit 21 is energized, thereby connecting the switch circuit of the first switch unit 21. At the same time, the first normally closed circuit of the closing button S51 will be disconnected, thereby prohibiting the opening power supply circuit 3 from being connected. The first end of the second normally open circuit of the opening button S61 is connected to the first end of the closing power supply circuit 1, and the second end of the second normally open circuit of the opening button S61 is connected to the control end of the second switch unit 41, as shown in FIG. Figure 2 As shown, when the staff presses the opening button S61, the second normally open circuit of the opening button S61 will be closed, so that the control end of the second switch unit 41 will be energized, thereby connecting the switch circuit of the second switch unit 41. At the same time, the second normally closed circuit of the opening button S61 will be disconnected, thereby prohibiting the closing power supply circuit 1 from being connected.

[0055] In some embodiments, Figure 2 As shown, the first switch unit 21 includes a first relay K1. The normally open circuit of the first relay K1 is the switch circuit of the first switch unit 21, the first end of the excitation coil of the first relay K1 is the control end of the first switch unit 21, and the second end of the excitation coil of the first relay K1 is connected to the second end of the closing power supply circuit 1. Figure 2 When the first normally open circuit of the closing button S51 is closed, the excitation coil of the first relay K1 is energized to work, so that the normally open circuit of the first relay K1 is attracted, thereby connecting the closing power supply circuit 1.

[0056] In some embodiments, Figure 2 As shown, the second switch unit 41 includes a second relay K2; the normally open circuit of the second relay K2 is the switch circuit of the second switch unit 41, the first end of the excitation coil of the second relay K2 is the control end of the second switch unit 41, and the second end of the excitation coil of the second relay K2 is connected to the second end of the opening power supply circuit 3. Figure 2 When the second normally open circuit of the opening button S61 is closed, the excitation coil of the second relay K2 is energized to work, so that the normally open circuit of the second relay K2 is attracted, thereby connecting the opening power supply circuit 3.

[0057] In some embodiments, Figure 2As shown, the closing control unit 2 also includes a first relay protection unit 22 connected to the excitation coil of the first relay K1 to prevent the first relay K1 from burning out. Further, the first relay protection unit 22 may include a first adjustable resistor U1 and a first capacitor C1. Specifically, the first end of the excitation coil of the first relay K1 is connected to the second end of the excitation coil of the first relay K1 via the first adjustable resistor U1 and the first capacitor C1.

[0058] In this embodiment, the first adjustable resistor U1 and the first capacitor C1 form a freewheeling circuit that can provide freewheeling to the excitation coil of the first relay K1, which can help the first relay K1 absorb the energy released by its excitation coil after power failure, and prevent the excitation coil from burning out due to excessive reverse electromotive force. In addition, the resistance value of the first adjustable resistor U1 can be adjusted according to the power of the excitation coil of the first relay K1.

[0059] In some embodiments, Figure 2 As shown, the opening control unit 4 also includes a second relay protection unit 42 connected to the excitation coil of the second relay K2 to prevent the second relay K2 from burning out. Further, the second relay protection unit 42 may include a second adjustable resistor U2 and a second capacitor C2. Specifically, the first end of the excitation coil of the second relay K2 is connected to the second end of the excitation coil of the second relay K2 via the second adjustable resistor U2 and the second capacitor C2. The principle and function of the second relay protection unit 42 are similar to those of the first relay protection unit 22, and will not be repeated here.

[0060] In some embodiments, Figure 2 As shown, the opening and closing control circuit also includes a first current limiting protection unit 7 and a second current limiting protection unit 8. Specifically, the first current limiting protection unit 7 is connected in series between the first end of the closing power supply circuit 1 and the first end of the first normally open circuit of the closing button S51, and the second current limiting protection unit 8 is connected in series between the first end of the opening power supply circuit 3 and the first end of the second normally open circuit of the opening button S61.

[0061] In this embodiment, the first current limiting protection unit 7 and the second current limiting protection unit 8 are used to respectively prevent the excitation coils of the first relay K1 and the second relay K2 from being burned out due to overcurrent.

[0062] Optionally, the first current limiting protection unit 7 and the second current limiting protection unit 8 include fuses respectively.

[0063] like Figure 3 As shown, the utility model also provides a switch opening and closing control device, which is used to locally control the switch opening and closing of the drawer. Figure 1 As shown, the drawer switch includes a closing coil 003XE and an opening coil 004XB. Figure 3As shown, the opening and closing control device includes a housing 9, and the opening and closing control circuit provided by the embodiment of the utility model is arranged in the housing 9.

[0064] In some embodiments, Figure 3 and Figure 4 As shown, the switch opening and closing control device also includes a first connector 10 and a second connector 20 arranged on the drawer switch side. Figure 2 and Figure 4 The first end J1_1 of the first connector 10 is connected to the first end of the closing power supply circuit 1 and the first end of the opening power supply circuit 3 through a cable, the second end J1_2 of the first connector 10 is connected to the second end of the closing power supply circuit 1 through a cable, and the third end J1_3 of the first connector 10 is connected to the second end of the opening power supply circuit 3 through a cable. Figure 1 and Figure 4 The first end of the second connector 20 is used to connect the power supply J2_1 of the closing and opening coils, the second end of the second connector 20 is used to connect the power supply end J2_2 of the closing coil 003XE, and the third end of the second connector 20 is used to connect the power supply end J2_3 of the opening coil 004XB. Figure 4 The first, second and third ends of the first connector 10 are detachably connected to the first, second and third ends of the second connector 20 in sequence.

[0065] In this embodiment, the staff can set the second connector 20 on the drawer switch side in advance and connect it according to the requirements. Later, as long as the first connector 10 and the second connector 20 are connected, the opening and closing functions of the drawer switch can be tested, which has the advantage of convenient connection.

[0066] Optionally, the first connector 10 is a French plug, and the second connector 20 is a French socket matching the first connector 10 .

[0067] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. A switch-on / off control circuit, used for locally controlling the switch-on / off of a drawer switch, wherein the drawer switch comprises a closing coil and an opening coil, characterized in that: The opening and closing control circuit comprises a closing power supply circuit (1), a closing control unit (2), an opening power supply circuit (3) and an opening control unit (4); The closing power supply circuit (1) has a first end for connecting to a power supply of the closing and opening coil of the drawer switch, and a second end for connecting to a power supply end of the closing coil; The closing control unit (2) is connected to the closing power supply circuit (1) and the opening power supply circuit (3), and is used to control the closing power supply circuit (1) to be connected, and to prohibit the opening power supply circuit (3) from being connected when the closing power supply circuit (1) is connected; The opening power supply circuit (3) has a first end connected to the first end of the closing power supply circuit (1), and a second end used to connect to the power supply end of the opening coil; The opening control unit (4) is connected to the closing power supply circuit (1) and the opening power supply circuit (3), and is used to control the opening power supply circuit (3) to be connected, and to prohibit the closing power supply circuit (1) from being connected when the opening power supply circuit (3) is connected.

2. The opening and closing control circuit according to claim 1, characterized in that: It also includes a closing prompt unit (5) and an opening prompt unit (6); The closing prompt unit (5) is connected in series between the first end and the second end of the closing power supply circuit (1), and is used to output a prompt signal when the closing power supply circuit (1) is connected; The switch-off prompt unit (6) is connected in series between the first end and the second end of the switch-off power supply circuit (3), and is used to output a prompt signal when the switch-off power supply circuit (3) is connected.

3. The opening and closing control circuit according to claim 2, characterized in that: The closing prompt unit (5) comprises a first indicator light L1 and a first buzzer B1; the first indicator light L1 and the first buzzer B1 are respectively connected in series between the first end and the second end of the closing power supply circuit (1); The switch-off prompt unit (6) comprises a second indicator light L2 and a second buzzer B2; the second indicator light L2 and the second buzzer B2 are respectively connected in series between the first end and the second end of the switch-off power supply circuit (3).

4. The opening and closing control circuit according to any one of claims 1 to 3, characterized in that: The closing control unit (2) comprises a closing button S51 and a first switch unit (21); the closing button S51 comprises a first normally closed circuit and a first normally open circuit; The opening control unit (4) comprises an opening button S61 and a second switch unit (41); the opening button S61 comprises a second normally closed circuit and a second normally open circuit; The first normally closed circuit and the switch circuit of the second switch unit (41) are respectively connected in series between the first end and the second end of the opening power supply circuit (3), and the second normally closed circuit and the switch circuit of the first switch unit (21) are respectively connected in series between the first end and the second end of the closing power supply circuit (1); The first end of the first normally open circuit is connected to the first end of the closing power supply circuit (1), and the second end of the first normally open circuit is connected to the control end of the first switch unit (21), so as to connect the switch circuit of the first switch unit (21) when the closing button S51 is pressed; The first end of the second normally open circuit is connected to the first end of the closing power supply circuit (1), the second end of the second normally open circuit is connected to the control end of the second switch unit (41), and the switch circuit of the second switch unit (41) is connected when the opening button S61 is pressed.

5. The opening and closing control circuit according to claim 4, characterized in that: The first switch unit (21) comprises a first relay K1; a normally open circuit of the first relay K1 is a switch circuit of the first switch unit (21); a first end of an excitation coil of the first relay K1 is a control end of the first switch unit (21); and a second end of the excitation coil of the first relay K1 is connected to a second end of the closing power supply circuit (1); The second switch unit (41) comprises a second relay K2; the normally open circuit of the second relay K2 is the switch circuit of the second switch unit (41); the first end of the excitation coil of the second relay K2 is the control end of the second switch unit (41); and the second end of the excitation coil of the second relay K2 is connected to the second end of the opening power supply circuit (3).

6. The opening and closing control circuit according to claim 5, characterized in that: The closing control unit (2) further comprises a first relay protection unit (22) connected to the excitation coil of the first relay K1 and used to prevent the first relay K1 from burning out; The opening control unit (4) further comprises a second relay protection unit (42) connected to the excitation coil of the second relay K2 and used to prevent the second relay K2 from burning out.

7. The opening and closing control circuit according to claim 6, characterized in that: The first relay protection unit (22) comprises a first adjustable resistor U1 and a first capacitor C1; the first end of the excitation coil of the first relay K1 is connected to the second end of the excitation coil of the first relay K1 via the first adjustable resistor U1 and the first capacitor C1; The second relay protection unit (42) comprises a second adjustable resistor U2 and a second capacitor C2; the first end of the excitation coil of the second relay K2 is connected to the second end of the excitation coil of the second relay K2 via the second adjustable resistor U2 and the second capacitor C2.

8. The opening and closing control circuit according to claim 4, characterized in that: It also includes a first current limiting protection unit (7) and a second current limiting protection unit (8); The first current limiting protection unit (7) is connected in series between the first end of the closing power supply circuit (1) and the first end of the first normally open circuit, and the second current limiting protection unit (8) is connected in series between the first end of the opening power supply circuit (3) and the first end of the second normally open circuit; The first current limiting protection unit (7) and the second current limiting protection unit (8) respectively comprise a fuse.

9. A switch-on / off control device, used for locally controlling the switch-on / off of a drawer switch, wherein the drawer switch comprises a closing coil and an opening coil, characterized in that: The opening and closing control device comprises a housing (9), wherein the opening and closing control circuit according to any one of claims 1 to 8 is arranged inside the housing (9).

10. The opening and closing control device according to claim 9, characterized in that: It also includes a first connector (10) and a second connector (20) arranged on the drawer switch side; The first end of the first connector (10) is connected to the first end of the closing power supply circuit (1) and the first end of the opening power supply circuit (3) through a cable, the second end of the first connector (10) is connected to the second end of the closing power supply circuit (1) through a cable, and the third end of the first connector (10) is connected to the second end of the opening power supply circuit (3) through a cable; The first end of the second connector (20) is used to connect the power supply of the opening and closing coil, the second end of the second connector (20) is used to connect the power supply end of the closing coil, and the third end of the second connector (20) is used to connect the power supply end of the opening coil; The first, second and third ends of the first connector (10) are detachably connected to the first, second and third ends of the second connector (20) in sequence.

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