Control circuit for cement plant solid waste project adhesive tape conveyor

Abstract

The embodiment of the utility model provides a control circuit for a cement plant solid waste project adhesive tape conveyor, and belongs to the technical field of adhesive tape conveyor control. The control circuit comprises a main power supply unit, a current transmitter, a control unit, a DCS (Distributed Control System), a field speed detection switch, a field button box switch, a pull rope switch and a deviation switch, and the main power supply unit is used for supplying power to the control circuit; one end of the current transmitter is connected with the main power supply unit and is used for converting alternating current in the main power supply unit into direct current signals; the first end of the control unit is connected with the other end of the current transmitter, and the control unit is used for controlling the adhesive tape conveyor and generating a control signal; the field speed detection switch is connected with the second end of the control unit; the field button box switch is connected with the third end of the control unit; the pull switch is connected with the fourth end of the control unit; the deviation switch is connected with the fifth end of the control unit; and the DCS system is connected with the sixth end of the control unit and is used for outputting a control signal.

Description

Technical Field

[0001] The utility model relates to the technical field of belt conveyor control, in particular to a control circuit for a belt conveyor of a solid waste project of a cement plant. Background Art

[0002] Solid waste refers to solid, semi-solid and gaseous items and materials placed in containers that have lost their original value or have not lost their value but have been discarded or abandoned in production, life and other activities, as well as items and materials that are included in solid waste management according to laws and administrative regulations. According to the source of solid waste and the degree of harm to the environment, solid waste can usually be divided into four categories: domestic waste, general industrial solid waste, hazardous waste and construction waste. In general, construction waste can be recycled and reused after simple classification; domestic waste, general industrial solid waste and hazardous waste all need to be processed and safely disposed of to eliminate environmental and ecological risks. At present, the focus of my country's solid waste pollution prevention and control management is urban domestic waste, general industrial solid waste and hazardous waste.

[0003] The use of new dry-process cement kilns to coordinate the treatment of urban domestic waste and industrial waste can promote the resource utilization and harmless treatment of waste; through coordinated resource utilization, a circular economy chain can be built, promoting enterprises to reduce energy and resource consumption and pollution emissions, and promoting traditional industries such as cement to resolve the contradiction of overcapacity, achieve green transformation, establish a good image of assuming social responsibility and protecting the environment, and achieve harmonious coexistence of enterprises and cities.

[0004] However, in the prior art, the control signal output of the belt conveyor is unstable, and signal interference may occur, which greatly reduces the control cost of the belt conveyor. Utility Model Content

[0005] The purpose of the embodiment of the utility model is a control circuit for a belt conveyor of a solid waste project in a cement plant, which solves the interference problem of AC signals.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a control circuit for a belt conveyor of a solid waste project of a cement plant, and the control circuit comprises:

[0007] A main power supply unit, used to supply power to the control circuit;

[0008] a current transmitter, one end of which is connected to the main power supply unit;

[0009] A control unit, a first end of which is connected to the other end of the current transmitter and is used to control the tape conveyor and generate a control signal;

[0010] An on-site speed detection switch connected to the second end of the control unit;

[0011] A field button box switch connected to the third terminal of the control unit;

[0012] a pull-cord switch connected to the fourth end of the control unit;

[0013] A deviation switch connected to the fifth terminal of the control unit;

[0014] A DCS system is connected to the sixth terminal of the control unit and is used to output the control signal.

[0015] Optionally, the main power supply unit includes:

[0016] A first main power supply, wherein the first main power supply includes three lines, namely a first main power supply line, a second main power supply line and a third main power supply line;

[0017] a first circuit breaker, wherein a first end of the first circuit breaker is connected to the first main power line, a third end of the first circuit breaker is connected to the second main power line, and a fifth end of the first circuit breaker is connected to the third main power line;

[0018] a first contactor, wherein a first end of the first contactor is connected to a second end of the first circuit breaker, a third end of the first contactor is connected to a fourth end of the first circuit breaker, and a fifth end of the first contactor is connected to a sixth end of the first circuit breaker;

[0019] a first thermal relay, wherein a first end of the first thermal relay is connected to a second end of the first contactor, a third end of the first thermal relay is connected to a fourth end of the first contactor, and a fifth end of the first thermal relay is connected to a sixth end of the first contactor;

[0020] an electric energy meter, wherein a tenth terminal of the electric energy meter is connected to the control unit;

[0021] a first resistor, one end of the first resistor being connected to the second end of the first thermal relay, and the other end of the first resistor being connected to the first end of the electric energy meter;

[0022] a second resistor, one end of the second resistor being connected to the fourth end of the first thermal relay, and the other end of the second resistor being connected to the second end of the electric energy meter;

[0023] a third resistor, one end of the third resistor being connected to the sixth end of the first thermal relay, and the other end of the third resistor being connected to the third end of the electric energy meter;

[0024] A current transformer, wherein the first end of the current transformer is connected to the fourth end of the electric energy meter, the second end of the current transformer is connected to the sixth end of the electric energy meter, the third end of the current transformer is connected to the eighth end of the electric energy meter, the fourth end, the fifth end, the sixth end and the seventh end of the current transformer are respectively connected to the fan, and the eighth end of the current transformer is grounded.

[0025] Optionally, the first terminal of the current transmitter is connected to the tenth terminal of the electric energy meter, the eighth terminal of the current transmitter is connected to the fifth terminal of the electric energy meter, and the sixth terminal of the current transmitter is grounded;

[0026] The fourth end of the current transmitter is connected to one end of the nineteenth terminal of the low-voltage cabinet terminal block wiring, and the fifth end of the current transmitter is connected to one end of the twentieth terminal of the low-voltage cabinet terminal block wiring.

[0027] Optionally, the control unit comprises:

[0028] A second circuit breaker, wherein a first end of the second circuit breaker is connected to a fourth end of the electric energy meter, a second end and a third end of the second circuit breaker are respectively connected to one end of a first terminal and a second terminal of a low-voltage cabinet terminal block, and the other ends of the first terminal and the second terminal of the low-voltage cabinet terminal block are connected to a power supply;

[0029] a second relay, one end of the second relay being connected to one end of the normally open switch of the first thermal relay;

[0030] A first indicator light, one end of the first indicator light is connected to one end of the normally open switch of the second relay, the other end of the first indicator light is connected to the other end of the second relay, and the other end of the normally open switch of the second relay is connected to the other end of the normally open switch of the first thermal relay;

[0031] a second indicator light, wherein one end of the second indicator light is connected to one end of the normally closed switch of the first contactor, and the other end of the normally closed switch of the first contactor is connected to the other end of the normally open switch of the second relay;

[0032] An experimental position switch, one end of the experimental position switch is connected to one end of the normally open switch of the first circuit breaker, the other end of the experimental position switch is connected to the other end of the normally open switch of the first circuit breaker, and the other end of the second indicator light is connected to the other end of the experimental position switch;

[0033] a third indicator light, one end of the third indicator light being connected to one end of the experimental position switch, the other end of the third indicator light being connected to one end of the normally closed switch of the first thermal relay, the other end of the normally closed switch of the first thermal relay being connected to the other end of the normally closed switch of the first contactor;

[0034] a fourth indicator light, one end of the fourth indicator light being connected to one end of the experimental position switch, the other end of the fourth indicator light being connected to one end of the normally open switch of the first contactor, the other end of the normally open switch of the first contactor being connected to one end of the normally closed switch of the first thermal relay;

[0035] The other end of the normally open switch of the first contactor is connected to one end of the seventh end of the first contactor, and the other end of the seventh end of the first contactor is connected to one end of the fifth terminal of the low-voltage cabinet terminal block wiring;

[0036] A third relay, one end of the third relay is connected to one end of the sixth terminal of the low-voltage cabinet terminal block wiring, and the other end of the sixth terminal of the low-voltage cabinet terminal block wiring is connected to the second end of the on-site speed detection switch;

[0037] A fourth relay, wherein a first end of the fourth relay is connected to one end of a sixteenth terminal of the low-voltage cabinet terminal block wiring, the other end of the sixteenth terminal of the low-voltage cabinet terminal block wiring is connected to a third end of the on-site button box switch, a second end of the fourth relay is connected to one end of a normally open switch of the fourth relay, the other end of the normally open switch of the fourth relay is connected to one end of the experimental position switch, and a third end of the fourth relay is connected to the other end of the third relay;

[0038] a fifth relay, wherein a first end of the fifth relay is connected to one end of the experimental position switch, a second end of the fifth relay is connected to one end of a normally open switch of the fifth relay, the other end of the normally open switch of the fifth relay is connected to one end of an eleventh terminal of a low-voltage cabinet terminal block wiring, the other end of the eleventh terminal of the low-voltage cabinet terminal block wiring is connected to an eleventh terminal in a DCS system, and a third end of the fifth relay is connected to the other end of a normally closed switch of the first thermal relay;

[0039] A third circuit breaker, wherein a first end of the third circuit breaker is connected to a third end of the fourth relay, a second end of the third circuit breaker is connected to one end of a tenth terminal of a low-voltage cabinet terminal block, and the other end of the tenth terminal of the low-voltage cabinet terminal block is connected to a power supply, a third end of the third circuit breaker is connected to one end of a normally open switch of the fifth relay, a fourth end of the third circuit breaker is connected to one end of a ninth terminal of a low-voltage cabinet terminal block, and the other end of the ninth terminal of the low-voltage cabinet terminal block is connected to a power supply;

[0040] One end of the normally closed switch of the second relay is connected to the other end of the normally open switch of the fifth relay, the other end of the normally closed switch of the second relay is connected to one end of the twelfth terminal of the low-voltage cabinet terminal block wiring, and the other end of the twelfth terminal of the low-voltage cabinet terminal block wiring is connected to the thirteenth terminal of the DCS system;

[0041] One end of the normally open switch of the first contactor is connected to the other end of the normally open switch of the fifth relay, the other end of the normally open switch of the first contactor is connected to one end of the thirteenth terminal of the low-voltage cabinet terminal block wiring, and the other end of the thirteenth terminal of the low-voltage cabinet terminal block wiring is connected to the twelfth terminal of the DCS system;

[0042] One end of the normally open switch of the third relay is connected to the other end of the normally open switch of the first contactor, the other end of the normally open switch of the third relay is connected to one end of the eighteenth terminal of the low-voltage cabinet terminal block wiring, and the other end of the eighteenth terminal of the low-voltage cabinet terminal block wiring is connected to the fourteenth terminal of the DCS system.

[0043] The control unit comprises:

[0044] A second circuit breaker, wherein a first end of the second circuit breaker is connected to a fourth end of the electric energy meter, a second end and a third end of the second circuit breaker are respectively connected to one end of a first terminal and a second terminal of a low-voltage cabinet terminal block, and the other ends of the first terminal and the second terminal of the low-voltage cabinet terminal block are connected to a power supply;

[0045] a second relay, one end of the second relay being connected to one end of the normally open switch of the first thermal relay;

[0046] A first indicator light, one end of the first indicator light is connected to one end of the normally open switch of the second relay, the other end of the first indicator light is connected to the other end of the second relay, and the other end of the normally open switch of the second relay is connected to the other end of the normally open switch of the first thermal relay;

[0047] a second indicator light, wherein one end of the second indicator light is connected to one end of the normally closed switch of the first contactor, and the other end of the normally closed switch of the first contactor is connected to the other end of the normally open switch of the second relay;

[0048] An experimental position switch, one end of the experimental position switch is connected to one end of the normally open switch of the first circuit breaker, the other end of the experimental position switch is connected to the other end of the normally open switch of the first circuit breaker, and the other end of the second indicator light is connected to the other end of the experimental position switch;

[0049] a third indicator light, one end of the third indicator light being connected to one end of the experimental position switch, the other end of the third indicator light being connected to one end of the normally closed switch of the first thermal relay, the other end of the normally closed switch of the first thermal relay being connected to the other end of the normally closed switch of the first contactor;

[0050] a fourth indicator light, one end of the fourth indicator light being connected to one end of the experimental position switch, the other end of the fourth indicator light being connected to one end of the normally open switch of the first contactor, the other end of the normally open switch of the first contactor being connected to one end of the normally closed switch of the first thermal relay;

[0051] The other end of the normally open switch of the first contactor is connected to one end of the seventh end of the first contactor, and the other end of the seventh end of the first contactor is connected to one end of the fifth terminal of the low-voltage cabinet terminal block wiring;

[0052] A third relay, one end of the third relay is connected to one end of the sixth terminal of the low-voltage cabinet terminal block wiring, and the other end of the sixth terminal of the low-voltage cabinet terminal block wiring is connected to the second end of the on-site speed detection switch;

[0053] A fourth relay, wherein a first end of the fourth relay is connected to one end of a sixteenth terminal of the low-voltage cabinet terminal block wiring, the other end of the sixteenth terminal of the low-voltage cabinet terminal block wiring is connected to a third end of the on-site button box switch, a second end of the fourth relay is connected to one end of a normally open switch of the fourth relay, the other end of the normally open switch of the fourth relay is connected to one end of the experimental position switch, and a third end of the fourth relay is connected to the other end of the third relay;

[0054] a fifth relay, wherein a first end of the fifth relay is connected to one end of the experimental position switch, a second end of the fifth relay is connected to one end of a normally open switch of the fifth relay, the other end of the normally open switch of the fifth relay is connected to one end of an eleventh terminal of a low-voltage cabinet terminal block wiring, the other end of the eleventh terminal of the low-voltage cabinet terminal block wiring is connected to an eleventh terminal in a DCS system, and a third end of the fifth relay is connected to the other end of a normally closed switch of the first thermal relay;

[0055] A third circuit breaker, wherein a first end of the third circuit breaker is connected to a third end of the fourth relay, a second end of the third circuit breaker is connected to one end of a tenth terminal of a low-voltage cabinet terminal block, and the other end of the tenth terminal of the low-voltage cabinet terminal block is connected to a power supply, a third end of the third circuit breaker is connected to one end of a normally open switch of the fifth relay, a fourth end of the third circuit breaker is connected to one end of a ninth terminal of a low-voltage cabinet terminal block, and the other end of the ninth terminal of the low-voltage cabinet terminal block is connected to a power supply;

[0056] One end of the normally closed switch of the second relay is connected to the other end of the normally open switch of the fifth relay, the other end of the normally closed switch of the second relay is connected to one end of the twelfth terminal of the low-voltage cabinet terminal block wiring, and the other end of the twelfth terminal of the low-voltage cabinet terminal block wiring is connected to the thirteenth terminal of the DCS system;

[0057] One end of the normally open switch of the first contactor is connected to the other end of the normally open switch of the fifth relay, the other end of the normally open switch of the first contactor is connected to one end of the thirteenth terminal of the low-voltage cabinet terminal block wiring, and the other end of the thirteenth terminal of the low-voltage cabinet terminal block wiring is connected to the twelfth terminal of the DCS system;

[0058] One end of the normally open switch of the third relay is connected to the other end of the normally open switch of the first contactor, the other end of the normally open switch of the third relay is connected to one end of the eighteenth terminal of the low-voltage cabinet terminal block wiring, and the other end of the eighteenth terminal of the low-voltage cabinet terminal block wiring is connected to the fourteenth terminal of the DCS system.

[0059] Optionally, the control unit includes a low-voltage cabinet terminal block wiring, and one end of a fourteenth terminal of the low-voltage cabinet terminal block wiring is connected to the other end of the normally open switch of the fifth relay;

[0060] One end of the sixteenth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the fourth relay;

[0061] One end of the fifteenth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the fourteenth terminal of the low-voltage cabinet terminal block wiring;

[0062] One end of the 22nd terminal of the low-voltage cabinet terminal block wiring is connected to one end of the 15th terminal of the low-voltage cabinet terminal block wiring;

[0063] One end of the nineteenth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the seventeenth terminal, one end of the twenty-third terminal of the low-voltage cabinet terminal block wiring is connected to one end of the twenty-fourth terminal, one end of the twenty-fifth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the twenty-sixth terminal, one end of the twenty-seventh terminal of the low-voltage cabinet terminal block wiring is connected to one end of the twenty-eighth terminal, and one end of the twenty-ninth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the thirtieth terminal.

[0064] Optionally, the other ends of the ninth terminal and the sixth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the first end and the second end of the on-site speed detection switch;

[0065] The other ends of the fourteenth terminal, the twenty-third terminal and the sixteenth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the first end, the second end and the third end of the on-site button box switch;

[0066] The other ends of the fifteenth terminal and the twenty-fifth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the first end and the second end of the pull-wire switch, and the pull-wire switch is provided in at least six groups, the second end of each group of pull-wire switches is connected to the second end of the next group of pull-wire switches, and the third end of each group of pull-wire switches is connected to the first end of the next group of pull-wire switches;

[0067] The other ends of the 22nd, 27th and 29th terminals of the low-voltage cabinet terminal block are connected to the first, second and fifth ends of the deviation switches. The deviation switches are provided in at least four groups, the third end of each group of deviation switches is connected to the first end of the next group of deviation switches, the second end of each group of deviation switches is connected to the second end of the next group of deviation switches, the sixth end of each group of deviation switches is connected to the fourth end of the next group of deviation switches, and the fifth end of each group of deviation switches is connected to the sixth end of the next group of deviation switches.

[0068] Optionally, the other ends of the first terminal and the second terminal of the low-voltage cabinet terminal block are connected to a power source;

[0069] The other ends of the tenth terminal and the ninth terminal of the low-voltage cabinet terminal block wiring are connected to the power supply;

[0070] The other ends of the 20th terminal and the 19th terminal of the low-voltage cabinet terminal block wiring are connected to the sixth terminal and the fifth terminal of the DCS system respectively;

[0071] The other ends of the eleventh terminal, the twelfth terminal, the thirteenth terminal, the eighteenth terminal, the twenty-sixth terminal, the twenty-eighth terminal, the thirtieth terminal, the seventeenth terminal and the twenty-fourth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the eleventh terminal, the thirteenth terminal, the twelfth terminal, the fourteenth terminal, the fifteenth terminal, the sixteenth terminal, the first terminal, the second terminal and the third terminal of the DCS system;

[0072] The other ends of the fifth terminal and the fourth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the twenty-third terminal and the twenty-fourth terminal of the DCS system.

[0073] Through the above technical scheme, the control circuit can realize the driving of the belt conveyor, and can transmit signals such as ready and answer to the DCS system. At the same time, the pull-rope switch, deviation switch, and on-site speed detection switch can be used to monitor material blockage and equipment operation in real time. At the same time, the control unit adopts AC220V AC control, and the pull-rope switch, deviation switch, on-site speed detection switch, and on-site button box switch adopt DC24V DC power supply control, which can not only meet the requirements of equipment operation and realize the automation function in operation management, but also avoid the interference problem of AC signals, and ensure the stability and anti-interference of signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0075] Figure 1It is a framework diagram of a control circuit for a belt conveyor for a solid waste project of a cement plant according to an embodiment of the utility model;

[0076] Figure 2 This is a control circuit schematic diagram of a belt conveyor for a cement plant solid waste project according to an embodiment of the utility model;

[0077] Figure 3 It is a circuit diagram of a main power supply unit of a control circuit for a belt conveyor of a cement plant solid waste project according to one embodiment of the utility model;

[0078] Figure 4 It is a circuit connection diagram of an electric energy meter and a current conveyor for a main power supply unit of a control circuit of a belt conveyor for a solid waste project of a cement plant according to an embodiment of the utility model;

[0079] Figure 5 It is a circuit diagram of a control unit of a control circuit for a belt conveyor of a solid waste project of a cement plant according to an embodiment of the utility model;

[0080] Figure 6 It is a connection circuit diagram of a low-voltage cabinet terminal block wiring of a control unit of a control circuit of a belt conveyor for a solid waste project of a cement plant according to an embodiment of the utility model;

[0081] Figure 7 It is a circuit diagram of a DCS system for a control circuit of a belt conveyor for a solid waste project of a cement plant according to an embodiment of the utility model.

[0082] Description of Reference Numerals

[0083] 1. Main power supply unit 2. Current transmitter

[0084] 3. Control unit 4. DCS system

[0085] 5. On-site speed detection switch 6. On-site button box switch

[0086] 7. Pull rope switch 8. Deviation switch

[0087] QF, first circuit breaker KM1, first contactor

[0088] KH, first thermal relay TA, current transformer

[0089] R1, first resistor R2, second resistor

[0090] R3, the third resistor KH1, the second relay

[0091] KS, third relay D01, fourth relay

[0092] Q1, second circuit breaker Q2, third circuit breaker

[0093] HY, first indicator light HG, second indicator light

[0094] HW, third indicator light HR, fourth indicator light DETAILED DESCRIPTION

[0095] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0096] In the embodiments of the present application, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings or are used to describe the relative positional relationships of components in the vertical, perpendicular or gravity direction.

[0097] In addition, if there are descriptions involving "first", "second", etc. in the implementation methods of this application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various implementation methods can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0098] like Figure 1 As stated, Figure 1It is a framework diagram of a control circuit for a belt conveyor of a solid waste project in a cement plant according to an embodiment of the utility model, the control circuit comprising: a main power supply unit 1, a current transmitter 2, a control unit 3, a DCS system 4, an on-site speed detection switch 5, an on-site button box switch 6, a pull rope switch 7 and a deviation switch 8, wherein the main power supply unit 1 is used to supply power to the control circuit; one end of the current transmitter is connected to the main power supply unit, and is used to convert the AC in the main power supply unit 1 into a DC signal; the first end of the control unit 3 is connected to the other end of the current transmitter 2, and is used to control the belt conveyor and generate a control signal; the on-site speed detection switch 5 is connected to the second end of the control unit 3; the on-site button box switch 6 is connected to the third end of the control unit 3; the pull rope switch 7 is connected to the fourth end of the control unit 3; the deviation switch 8 is connected to the fifth end of the control unit 3; the DCS system is connected to the sixth end of the control unit 3, and is used to output a control signal. In the utility model, the control circuit can realize the driving of the belt conveyor, and can transmit signals such as ready and response to the DCS system. At the same time, the pull-rope switch 7, the deviation switch 8, and the on-site speed detection switch 5 can be used to monitor material blockage and equipment operation in real time. At the same time, the control unit 3 adopts AC220V AC control, and the pull-rope switch 7, the deviation switch 8, the on-site speed detection switch 5, and the on-site button box switch 6 adopt DC24V DC power supply control, which ensures the stability and anti-interference of signal transmission.

[0099] In this embodiment, the connection mode of the main power supply unit 1 can be a variety of connection modes known to those skilled in the art. In one embodiment of the utility model, the main power supply unit includes: a first main power supply, a first circuit breaker QF, a first contactor KM1, a first thermal relay KH, an electric energy meter, a first resistor R1, a second resistor R2, a third resistor R3 and a current transformer TA, wherein the first main power supply is a 380V AC power supply, and the first main power supply includes three lines, namely, a first main power supply line, a second main power supply line and a third main power supply line; a first end of the first circuit breaker QF is connected to the first main power supply line; a third end of the first circuit breaker QF is connected to the second main power supply line; a fifth end of the first circuit breaker QF is connected to the third main power supply line; a first end of the first contactor KM1 is connected to the second end of the first circuit breaker QF; a third end of the first contactor KM1 is connected to the fourth end of the first circuit breaker QF; a fifth end of the first contactor KM1 is connected to the sixth end of the first circuit breaker QF; and a first thermal relay KH The first end of the first thermal relay KH is connected to the second end of the first contactor KM1, the third end of the first thermal relay KH is connected to the fourth end of the first contactor KM1; the fifth end of the first thermal relay KH is connected to the sixth end of the first contactor KM1; the tenth end of the electric energy meter is connected to the control unit 3; one end of the first resistor R1 is connected to the second end of the first thermal relay KH, and the other end of the first resistor R1 is connected to the first end of the electric energy meter; one end of the second resistor R2 is connected to the fourth end of the first thermal relay KH, and the other end of the second resistor R2 is connected to the second end of the electric energy meter. One end of the third resistor R3 is connected to the sixth end of the first thermal relay KH, and the other end of the third resistor R3 is connected to the third end of the electric energy meter; the first end of the current transformer TA is connected to the fourth end of the electric energy meter, the second end of the current transformer TA is connected to the sixth end of the electric energy meter, the third end of the current transformer TA is connected to the eighth end of the electric energy meter, the fourth end, the fifth end, the sixth end, and the seventh end of the current transformer TA are respectively connected to the T end, the S end, the R end, and the PE end of the fan, and the eighth end of the current transformer is grounded. The belt conveyor adopts a 380V line, and uses the first circuit breaker QF, the first contactor KM1, and the first thermal relay KH as the main power supply circuit. The current transformer TA is set to transmit the operating current signal to the electric energy meter, and the current analog signal is transmitted to the DCS system after conversion by the current transmitter BA.

[0100] In this embodiment, the first end of the current transmitter BA is connected to the tenth end of the electric energy meter, the eighth end of the current transmitter BA is connected to the fifth end of the electric energy meter, and the sixth end of the current transmitter BA is grounded; the fourth end of the current transmitter BA is connected to one end of the nineteenth terminal of the low-voltage cabinet terminal block wiring, and the fifth end of the current transmitter BA is connected to one end of the twentieth terminal of the low-voltage cabinet terminal block wiring.

[0101] In this embodiment, the connection mode of the control unit can be a variety of connection modes known to those skilled in the art. In one embodiment of the utility model, the control unit includes: a second circuit breaker Q1, a second relay KH1, a first indicator light HY, a second indicator light HG, a third indicator light HW, a fourth indicator light HR, an experimental position switch, a third relay KS, a fourth relay D01, a fifth relay K0 and a third circuit breaker Q2, wherein a first end of the second circuit breaker Q1 is connected to a fourth end of the electric energy meter, a second end and a third end of the second circuit breaker Q1 are respectively connected to one end of a first terminal and a second terminal of a low-voltage cabinet terminal block, and the other end of the first terminal and the second terminal of the low-voltage cabinet terminal block is connected to power supply; one end of the second relay KH1 is connected to one end of the normally open switch of the first thermal relay KH; one end of the first indicator light HY is connected to one end of the normally open switch of the second relay KH1, and the other end of the normally open switch of the second relay KH1 is connected to the other end of the normally open switch of the first thermal relay KH; one end of the second indicator light HG is connected to one end of the normally closed switch of the first contactor KM1, and the other end of the normally closed switch of the first contactor KM1 is connected to the other end of the second relay KH1; one end of the experimental position switch is connected to one end of the normally open switch of the first circuit breaker QF, and the other end of the experimental position switch is connected to the other end of one end of the normally open switch of the first circuit breaker QF, and the other end of the second indicator light HG is connected to the experimental position switch. The other end of the position switch is connected; one end of the third indicator light HW is connected to one end of the experimental position switch, the other end of the third indicator light HW is connected to one end of the normally closed switch of the first thermal relay KH, and the other end of the normally closed switch of the first thermal relay KH is connected to the other end of the normally closed switch of the first contactor KM1; one end of the fourth indicator light HR is connected to one end of the experimental position switch, the other end of the fourth indicator light HR is connected to one end of the normally open switch of the first contactor KM1, and the other end of the normally open switch of the first contactor KM1 is connected to one end of the normally closed switch of the first thermal relay KH; the other end of the normally open switch of the first contactor KM1 is connected to one end of the seventh end of the first contactor KM1, and the other end of the seventh end of the first contactor KM1 is connected One end is connected to one end of the fifth terminal of the low-voltage cabinet terminal block wiring; one end of the third relay is connected to one end of the sixth terminal of the low-voltage cabinet terminal block wiring, and the other end of the sixth terminal of the low-voltage cabinet terminal block wiring is connected to the second end of the on-site speed detection switch; the first end of the fourth relay D01 is connected to one end of the sixteenth terminal of the low-voltage cabinet terminal block wiring, and the other end of the sixteenth terminal of the low-voltage cabinet terminal block wiring is connected to the third end of the on-site button box switch, the second end of the fourth relay D01 is connected to one end of the normally open switch of the fourth relay D01, the other end of the normally open switch of the fourth relay D01 is connected to one end of the experimental position switch, and the third end of the fourth relay D01 is connected to the other end of the third relay KS;A first end of the fifth relay K0 is connected to one end of the experimental position switch, a second end of the fifth relay K0 is connected to one end of the normally open switch of the fifth relay K0, the other end of the normally open switch of the fifth relay K0 is connected to one end of the eleventh terminal of the low-voltage cabinet terminal block wiring, the other end of the eleventh terminal of the low-voltage cabinet terminal block wiring is connected to the eleventh end in the DCS system, and a third end of the fifth relay K0 is connected to the other end of the normally closed switch of the first thermal relay KH; a first end of the third circuit breaker Q2 is connected to a third end of the fourth relay D01, a second end of the third circuit breaker Q2 is connected to one end of the tenth terminal of the low-voltage cabinet terminal block wiring, the other end of the tenth terminal of the low-voltage cabinet terminal block wiring is connected to a power supply, a third end of the third circuit breaker Q2 is connected to one end of the normally open switch of the fifth relay K0, a fourth end of the third circuit breaker Q2 is connected to one end of the ninth terminal of the low-voltage cabinet terminal block wiring, and the other end of the ninth terminal of the low-voltage cabinet terminal block wiring is connected to a power supply; One end of the normally closed switch of the second relay KH1 is connected to the other end of the normally open switch of the fifth relay K0, the other end of the normally closed switch of the second relay KH1 is connected to one end of the twelfth terminal of the low-voltage cabinet terminal block wiring, and the other end of the twelfth terminal of the low-voltage cabinet terminal block wiring is connected to the thirteenth terminal of the DCS system; one end of the normally open switch of the first contactor KM1 is connected to the other end of the normally open switch of the fifth relay K0, the other end of the normally open switch of the first contactor KM1 is connected to one end of the thirteenth terminal of the low-voltage cabinet terminal block wiring, and the other end of the thirteenth terminal of the low-voltage cabinet terminal block wiring is connected to the twelfth terminal of the DCS system; one end of the normally open switch of the third relay KS is connected to the other end of the normally open switch of the fifth relay K0, the other end of the normally open switch of the third relay KS is connected to one end of the eighteenth terminal of the low-voltage cabinet terminal block wiring, and the other end of the eighteenth terminal of the low-voltage cabinet terminal block wiring is connected to the fourteenth terminal of the DCS system. ;

[0102] The control circuit uses a DC24V AC power supply, that is, the other end of the ninth terminal and the tenth terminal of the low-voltage cabinet terminal block wiring is connected to a DC24V AC power supply, the third circuit breaker Q2 is closed, the fourth relay D01 is energized, and the normally open switch of the fourth relay D01 is closed. The secondary circuit of the low-voltage cabinet uses a 200VAC AC power supply, that is, the other end of the first terminal and the second terminal of the low-voltage cabinet terminal block wiring is connected to a 200VAC AC power supply. The secondary circuit of the low-voltage cabinet is provided with an experimental position switch. When the secondary circuit is pushed to the test position, after the second circuit breaker Q1 in the secondary circuit is closed, the secondary circuit can be debugged without closing the first circuit breaker QF of the main power supply circuit; the non-debugging state is a normal working state, the first circuit breaker QF in the main power supply circuit is closed, the normally open switch of the first circuit breaker QF is closed, the second circuit breaker Q1 in the secondary circuit is closed, the secondary circuit is energized, and the third indicator light HW is on. The third indicator light HW is a white ready indicator light. The fifth relay K0 is energized, and the normally open switch of the fifth relay K0 is closed to feed back a ready signal to the DCS system. After receiving the ready signal, the DCS system drives the driving signal of the DCS cabinet relay to energize the first contactor KM1, and the motor runs. The fourth indicator light HR is on, and the fourth indicator light HR is a red running light.

[0103] In this embodiment, the control unit also includes a low-voltage cabinet terminal block wiring, one end of the fourteenth terminal of the low-voltage cabinet terminal block wiring is connected to the other end of the normally open switch of the fifth relay K0; one end of the sixteenth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the fourth relay D01; one end of the fifteenth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the fourteenth terminal of the low-voltage cabinet terminal block wiring; one end of the twenty-second terminal of the low-voltage cabinet terminal block wiring is connected to one end of the fifteenth terminal of the low-voltage cabinet terminal block wiring; one end of the nineteenth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the seventeenth terminal, one end of the twenty-third terminal of the low-voltage cabinet terminal block wiring is connected to one end of the twenty-fourth terminal, one end of the twenty-fifth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the twenty-sixth terminal, one end of the twenty-seventh terminal of the low-voltage cabinet terminal block wiring is connected to one end of the twenty-eighth terminal, and one end of the twenty-ninth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the thirtieth terminal.

[0104] In this embodiment, the other ends of the ninth terminal and the sixth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the first end and the second end of the on-site speed detection switch; the other ends of the fourteenth terminal, the twenty-third terminal and the sixteenth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the first end, the second end and the third end of the on-site button box switch; the other ends of the fifteenth terminal and the twenty-fifth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the first end and the second end of the pull-rope switch, and the pull-rope switches are provided in at least six groups, and the second end of each group of pull-rope switches is connected to the second end of the next group of pull-rope switches, and each The third end of a group of pull-rope switches is connected to the first end of the next group of pull-rope switches; the other ends of the twenty-second terminal, the twenty-seventh terminal and the twenty-ninth terminal of the low-voltage cabinet terminal block are connected to the first end, the second end and the fifth end of the deviation switch. There are at least four groups of deviation switches, the third end of each group of deviation switches is connected to the first end of the next group of deviation switches, the second end of each group of deviation switches is connected to the second end of the next group of deviation switches, the sixth end of each group of deviation switches is connected to the fourth end of the next group of deviation switches, and the fifth end of each group of deviation switches is connected to the sixth end of the next group of deviation switches.

[0105] In this embodiment, the other ends of the first terminal and the second terminal of the low-voltage cabinet terminal block wiring are connected to a power supply; the other ends of the tenth terminal and the ninth terminal of the low-voltage cabinet terminal block wiring are connected to a power supply; the other ends of the twentieth terminal and the nineteenth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the sixth end and the fifth end of the DCS system; the other ends of the eleventh terminal, the twelfth terminal, the thirteenth terminal, the eighteenth terminal, the twenty-sixth terminal, the twenty-eighth terminal, the thirtieth terminal, the seventeenth terminal and the twenty-fourth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the eleventh end, the thirteenth end, the twelfth end, the fourteenth end, the fifteenth end, the sixteenth end, the first end, the second end and the third end of the DCS system; the other ends of the fifth terminal and the fourth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the twenty-third terminal and the twenty-fourth terminal of the DCS system. The eleventh terminal of the DCS system is used to receive the ready signal, the thirteenth terminal of the DCS system is used to receive the first thermal relay KH signal, the twelfth terminal of the DCS system is used to receive the running signal, the fourteenth terminal of the DCS system is used to receive the speed detection signal, the fifteenth terminal of the DCS system is used to receive the pull rope signal, the sixteenth terminal of the DCS system is used to receive the first deviation signal, the first terminal of the DCS system is used to receive the second deviation signal, the second terminal of the DCS system is used to receive the on-site stop signal, the third terminal of the DCS system is used to receive the on-site start signal, the fifth and sixth terminals of the DCS system are used to receive the current signal, and the twenty-third and twenty-fourth terminals of the DCS system are used to send out the drive signal.

[0106] In this embodiment, when the circuit works normally, the on-site speed detection device adopts the DC control of the control circuit DC24V, the third relay KS is energized, and the normally open switch of the third relay KS is closed to feed back the speed signal to the DCS system. The pull rope switch and the deviation switch adopt the DC control of the control circuit DC24V to feed back the working status signal to the DCS system. If the belt conveyor stops, deviates, or the on-site pull rope action occurs, the DCS signal will be lost.

[0107] The control loop line leads to the on-site button box switch. There are a stop button S1 and a start button S2 in the button box body. When the start button S2 is pressed, the start signal is fed back to the DCS system. When the speed switch, pull rope switch and deviation switch are not actuated, the belt conveyor starts; when the stop switch S1 is pressed, the stop signal is fed back to the DCS system, and at the same time the fourth relay D01 loses power, causing the first contactor KM1 to lose power, the motor stops rotating, the fourth indicator HR red running signal light goes out, the second indicator HG lights up, and the second indicator HG is a green stop signal light.

[0108] When the first thermal relay KH in the main power supply circuit is actuated, the normally closed switch of the first thermal relay KH is disconnected, the normally open switch is closed, the first indicator light HY goes out, and the first indicator light HY turns on as a yellow alarm signal light; the second relay KH1 is energized, the normally open switch of the second relay KH1 is closed, the yellow alarm signal light of the first indicator light HY turns on, the normally closed switch of the second relay KH1 is disconnected, and the signal feedback of the first thermal relay KH to the DCS system is lost.

[0109] In this implementation, considering that the project tape machine will not be too long, in one embodiment of the utility model, the control signal adopts a DC 24V power supply. Since the current direction of DC power remains unchanged, it will not be affected by the magnetic field, thereby avoiding the magnetic field interference problem in AC power and ensuring the stability of the signal output.

[0110] Through the above technical scheme, the control circuit can realize the driving of the belt conveyor, and can transmit signals such as ready and answer to the DCS system. At the same time, the pull-rope switch 7, the deviation switch 8, and the on-site speed detection switch 5 can be used to monitor material blockage and equipment operation in real time. At the same time, the control unit 3 adopts AC220V AC control, and the pull-rope switch 7, the deviation switch 8, the on-site speed detection switch 5, and the on-site button box switch 6 adopt DC24V DC power supply control, which can not only meet the requirements of equipment operation and realize the automation function in operation management, but also avoid the interference problem of AC signals, thereby ensuring the stability and anti-interference of signal transmission.

[0111] The optional implementation modes of the utility model examples are described in detail above in conjunction with the accompanying drawings. However, the implementation modes of the utility model are not limited to the specific details in the above implementation modes. Within the technical concept of the implementation modes of the utility model, various simple modifications can be made to the technical solutions of the implementation modes of the utility model. These simple modifications all belong to the protection scope of the implementation modes of the utility model.

[0112] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of the embodiments of the present utility model will not be described separately.

[0113] In addition, various different embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A control circuit for a belt conveyor in a cement plant solid waste project, characterized in that: The control circuit comprises: A main power supply unit, used to supply power to the control circuit; a current transmitter, one end of which is connected to the main power supply unit; A control unit, a first end of which is connected to the other end of the current transmitter and is used to control the tape conveyor and generate a control signal; An on-site speed detection switch connected to the second end of the control unit; A field button box switch connected to the third terminal of the control unit; a pull-cord switch connected to the fourth end of the control unit; A deviation switch connected to the fifth terminal of the control unit; A DCS system is connected to the sixth terminal of the control unit and is used to output the control signal.

2. The control circuit according to claim 1, characterized in that: The main power supply unit comprises: A first main power supply, wherein the first main power supply includes three lines, namely a first main power supply line, a second main power supply line and a third main power supply line; a first circuit breaker, wherein a first end of the first circuit breaker is connected to the first main power line, a third end of the first circuit breaker is connected to the second main power line, and a fifth end of the first circuit breaker is connected to the third main power line; a first contactor, wherein a first end of the first contactor is connected to a second end of the first circuit breaker, a third end of the first contactor is connected to a fourth end of the first circuit breaker, and a fifth end of the first contactor is connected to a sixth end of the first circuit breaker; a first thermal relay, wherein a first end of the first thermal relay is connected to the second end of the first contactor, a third end of the first thermal relay is connected to the fourth end of the first contactor, and a fifth end of the first thermal relay is connected to the sixth end of the first contactor; an electric energy meter, wherein a tenth terminal of the electric energy meter is connected to the control unit; a first resistor, one end of the first resistor being connected to the second end of the first thermal relay, and the other end of the first resistor being connected to the first end of the electric energy meter; a second resistor, one end of the second resistor being connected to the fourth end of the first thermal relay, and the other end of the second resistor being connected to the second end of the electric energy meter; a third resistor, one end of the third resistor being connected to the sixth end of the first thermal relay, and the other end of the third resistor being connected to the third end of the electric energy meter; A current transformer, wherein the first end of the current transformer is connected to the fourth end of the electric energy meter, the second end of the current transformer is connected to the sixth end of the electric energy meter, the third end of the current transformer is connected to the eighth end of the electric energy meter, the fourth end, the fifth end, the sixth end and the seventh end of the current transformer are respectively connected to the fan, and the eighth end of the current transformer is grounded.

3. The control circuit according to claim 2, characterized in that: The first terminal of the current transducer is connected to the tenth terminal of the electric energy meter, the eighth terminal of the current transducer is connected to the fifth terminal of the electric energy meter, and the sixth terminal of the current transducer is grounded; The fourth end of the current transmitter is connected to one end of the nineteenth terminal of the low-voltage cabinet terminal block wiring, and the fifth end of the current transmitter is connected to one end of the twentieth terminal of the low-voltage cabinet terminal block wiring.

4. The control circuit according to claim 3, characterized in that: The control unit comprises: A second circuit breaker, wherein a first end of the second circuit breaker is connected to a fourth end of the electric energy meter, a second end and a third end of the second circuit breaker are respectively connected to one end of a first terminal and a second terminal of a low-voltage cabinet terminal block, and the other ends of the first terminal and the second terminal of the low-voltage cabinet terminal block are connected to a power supply; a second relay, one end of the second relay being connected to one end of the normally open switch of the first thermal relay; A first indicator light, one end of the first indicator light is connected to one end of the normally open switch of the second relay, the other end of the first indicator light is connected to the other end of the second relay, and the other end of the normally open switch of the second relay is connected to the other end of the normally open switch of the first thermal relay; a second indicator light, wherein one end of the second indicator light is connected to one end of the normally closed switch of the first contactor, and the other end of the normally closed switch of the first contactor is connected to the other end of the normally open switch of the second relay; An experimental position switch, one end of the experimental position switch is connected to one end of the normally open switch of the first circuit breaker, the other end of the experimental position switch is connected to the other end of the normally open switch of the first circuit breaker, and the other end of the second indicator light is connected to the other end of the experimental position switch; a third indicator light, one end of the third indicator light being connected to one end of the experimental position switch, the other end of the third indicator light being connected to one end of the normally closed switch of the first thermal relay, the other end of the normally closed switch of the first thermal relay being connected to the other end of the normally closed switch of the first contactor; a fourth indicator light, one end of the fourth indicator light being connected to one end of the experimental position switch, the other end of the fourth indicator light being connected to one end of the normally open switch of the first contactor, the other end of the normally open switch of the first contactor being connected to one end of the normally closed switch of the first thermal relay; The other end of the normally open switch of the first contactor is connected to one end of the seventh end of the first contactor, and the other end of the seventh end of the first contactor is connected to one end of the fifth terminal of the low-voltage cabinet terminal block wiring; A third relay, one end of the third relay is connected to one end of the sixth terminal of the low-voltage cabinet terminal block wiring, and the other end of the sixth terminal of the low-voltage cabinet terminal block wiring is connected to the second end of the on-site speed detection switch; A fourth relay, wherein a first end of the fourth relay is connected to one end of a sixteenth terminal of the low-voltage cabinet terminal block wiring, the other end of the sixteenth terminal of the low-voltage cabinet terminal block wiring is connected to a third end of the on-site button box switch, a second end of the fourth relay is connected to one end of a normally open switch of the fourth relay, the other end of the normally open switch of the fourth relay is connected to one end of the experimental position switch, and a third end of the fourth relay is connected to the other end of the third relay; a fifth relay, wherein a first end of the fifth relay is connected to one end of the experimental position switch, a second end of the fifth relay is connected to one end of a normally open switch of the fifth relay, the other end of the normally open switch of the fifth relay is connected to one end of an eleventh terminal of a low-voltage cabinet terminal block wiring, the other end of the eleventh terminal of the low-voltage cabinet terminal block wiring is connected to an eleventh terminal in a DCS system, and a third end of the fifth relay is connected to the other end of a normally closed switch of the first thermal relay; A third circuit breaker, wherein a first end of the third circuit breaker is connected to a third end of the fourth relay, a second end of the third circuit breaker is connected to one end of a tenth terminal of a low-voltage cabinet terminal block, and the other end of the tenth terminal of the low-voltage cabinet terminal block is connected to a power supply, a third end of the third circuit breaker is connected to one end of a normally open switch of the fifth relay, a fourth end of the third circuit breaker is connected to one end of a ninth terminal of a low-voltage cabinet terminal block, and the other end of the ninth terminal of the low-voltage cabinet terminal block is connected to a power supply; One end of the normally closed switch of the second relay is connected to the other end of the normally open switch of the fifth relay, the other end of the normally closed switch of the second relay is connected to one end of the twelfth terminal of the low-voltage cabinet terminal block wiring, and the other end of the twelfth terminal of the low-voltage cabinet terminal block wiring is connected to the thirteenth terminal of the DCS system; One end of the normally open switch of the first contactor is connected to the other end of the normally open switch of the fifth relay, the other end of the normally open switch of the first contactor is connected to one end of the thirteenth terminal of the low-voltage cabinet terminal block wiring, and the other end of the thirteenth terminal of the low-voltage cabinet terminal block wiring is connected to the twelfth terminal of the DCS system; One end of the normally open switch of the third relay is connected to the other end of the normally open switch of the first contactor, the other end of the normally open switch of the third relay is connected to one end of the eighteenth terminal of the low-voltage cabinet terminal block wiring, and the other end of the eighteenth terminal of the low-voltage cabinet terminal block wiring is connected to the fourteenth terminal of the DCS system.

5. The control circuit according to claim 4, characterized in that: The control unit includes a low-voltage cabinet terminal block wiring, one end of a fourteenth terminal of the low-voltage cabinet terminal block wiring is connected to the other end of a normally open switch of a fifth relay; One end of the sixteenth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the fourth relay; One end of the fifteenth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the fourteenth terminal of the low-voltage cabinet terminal block wiring; One end of the 22nd terminal of the low-voltage cabinet terminal block wiring is connected to one end of the 15th terminal of the low-voltage cabinet terminal block wiring; One end of the nineteenth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the seventeenth terminal, one end of the twenty-third terminal of the low-voltage cabinet terminal block wiring is connected to one end of the twenty-fourth terminal, one end of the twenty-fifth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the twenty-sixth terminal, one end of the twenty-seventh terminal of the low-voltage cabinet terminal block wiring is connected to one end of the twenty-eighth terminal, and one end of the twenty-ninth terminal of the low-voltage cabinet terminal block wiring is connected to one end of the thirtieth terminal.

6. The control circuit according to claim 5, characterized in that: The other ends of the ninth terminal and the sixth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the first end and the second end of the on-site speed detection switch; The other ends of the fourteenth terminal, the twenty-third terminal and the sixteenth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the first end, the second end and the third end of the on-site button box switch; The other ends of the fifteenth terminal and the twenty-fifth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the first end and the second end of the pull-wire switch, and the pull-wire switch is provided in at least six groups, the second end of each group of pull-wire switches is connected to the second end of the next group of pull-wire switches, and the third end of each group of pull-wire switches is connected to the first end of the next group of pull-wire switches; The other ends of the 22nd, 27th and 29th terminals of the low-voltage cabinet terminal block are connected to the first, second and fifth ends of the deviation switches. The deviation switches are provided in at least four groups, the third end of each group of deviation switches is connected to the first end of the next group of deviation switches, the second end of each group of deviation switches is connected to the second end of the next group of deviation switches, the sixth end of each group of deviation switches is connected to the fourth end of the next group of deviation switches, and the fifth end of each group of deviation switches is connected to the sixth end of the next group of deviation switches.

7. The control circuit according to claim 6, characterized in that: The other ends of the first terminal and the second terminal of the low-voltage cabinet terminal block are connected to a power source; The other ends of the tenth terminal and the ninth terminal of the low-voltage cabinet terminal block wiring are connected to the power supply; The other ends of the 20th terminal and the 19th terminal of the low-voltage cabinet terminal block wiring are connected to the sixth terminal and the fifth terminal of the DCS system respectively; The other ends of the eleventh terminal, the twelfth terminal, the thirteenth terminal, the eighteenth terminal, the twenty-sixth terminal, the twenty-eighth terminal, the thirtieth terminal, the seventeenth terminal and the twenty-fourth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the eleventh terminal, the thirteenth terminal, the twelfth terminal, the fourteenth terminal, the fifteenth terminal, the sixteenth terminal, the first terminal, the second terminal and the third terminal of the DCS system; The other ends of the fifth terminal and the fourth terminal of the low-voltage cabinet terminal block wiring are respectively connected to the twenty-third terminal and the twenty-fourth terminal of the DCS system.

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