A device for controlling the holding brake of a metallurgical crane with dual-circuit output in series

Abstract

This invention discloses a device for controlling a metallurgical overhead crane brake using a dual-circuit output series connection. The device includes a first circuit breaker, a second circuit breaker, and a combined circuit breaker. The input terminals of the first, second, and combined circuit breakers are connected to the live wire, and the output terminal of the first circuit breaker is connected to a digital output module. The Q0.0 and Q0.1 terminals of the digital output module are connected to an A-circuit output relay and a B-circuit output relay, respectively. The A-circuit and B-circuit output relays are connected to the neutral wire. This invention effectively avoids the problems associated with currently used single PLC output circuits, single electrical control circuits, and single contactor main contact control brake contactors. When a fault occurs, the main circuit of the metallurgical overhead crane cannot be de-energized, leading to the risk of the load falling and molten steel spilling, posing a serious threat to the personal safety of personnel and equipment on the ground.

Description

Technical Field

[0001] The invention relates to the technical field of holding brakes, and in particular to a device for controlling the holding brakes of a metallurgical crane in series with dual-circuit outputs. Background Art

[0002] In recent years, with the continuous development of steel enterprises, the productivity and scale of enterprises have been continuously expanded, and the safety accidents that follow have also been increasing. Metallurgical overhead crane is one of the most important equipment in steel enterprises and belongs to the category of special equipment management. How to improve the safety of metallurgical overhead crane is crucial to the production and safety indicators of enterprises.

[0003] At present, the main / auxiliary lifting and trolley travel of metallurgical cranes in steel enterprises mostly adopt single PLC output circuit, single electrical control circuit and single contactor main contact to control the brake contactor. When a fault occurs, the main circuit of the metallurgical crane cannot be powered off, resulting in the risk of hanging objects falling and molten steel spilling from the metallurgical crane, posing a serious threat to the personal safety of ground personnel and equipment safety. Once it occurs, it will bring huge losses to the safety and economy of the enterprise. Summary of the invention

[0004] In response to the above technical problems, the present invention provides a device for controlling the holding brake of a metallurgical crane in series with a dual-circuit output, which can avoid the problem that the currently used single PLC output circuit, single electrical control circuit and single contactor main contact control the holding brake contactor. When a fault occurs, the main circuit of the metallurgical crane cannot be powered off, resulting in the risk of hanging objects falling and molten steel spilling from the metallurgical crane, posing a serious threat to the personal safety of ground personnel and equipment safety.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A device for controlling a metallurgical crane brake in series with dual-circuit outputs, comprising a first circuit breaker, a second circuit breaker and a combined circuit breaker, wherein the inlet terminals of the first circuit breaker, the second circuit breaker and the combined circuit breaker are respectively connected to a live wire, the outlet terminals of the first circuit breaker are connected to a digital output module, the Q0.0 and Q0.1 terminals of the digital output module are respectively connected to an A-circuit output relay and a B-circuit output relay, the A-circuit output relay and the B-circuit output relay are respectively connected to a neutral line, and the outlet terminals of the second circuit breaker are respectively connected to a live wire. The normally open contacts of the A-loop output relay and the B-loop output relay are respectively connected, the normally open contacts of the A-loop output relay are connected to the neutral line through the A-loop output contactor, the normally open contacts of the B-loop output relay are connected to the neutral line through the B-loop output contactor, the outlet end of the combined circuit breaker is connected to the normally open contacts of the A-loop output contactor, the normally open contacts of the A-loop output contactor are connected to the normally open contacts of the B-loop output contactor, and the normally open contacts of the B-loop output contactor are respectively connected to the first brake motor and the second brake motor.

[0007] A first resistor is connected in parallel to the A-loop output relay, which is connected in series with a first capacitor and then connected to the neutral line. A second resistor is connected in parallel to the B-loop output relay, which is connected in series with a second capacitor and then connected to the neutral line.

[0008] The A-loop output contactor is connected in parallel with an A-loop output indicator light, and the B-loop output contactor is connected in parallel with a B-loop output indicator light.

[0009] The beneficial effects of the present invention are as follows: in order to overcome the risk of the main circuit failing to be powered off and causing the metallurgical overhead crane to have hanging objects falling and molten steel spilling due to the failure of the single PLC output circuit, the single electrical control circuit and the single contactor main contact control, the present invention designs a dual PLC output circuit and a dual electrical control circuit, that is, the A circuit output relay and the B circuit output relay are respectively connected to the digital output module, and the A circuit output contactor and the B circuit output contactor are respectively connected to the second circuit breaker, so as to realize the control of the holding brake by the dual PLC output channel, the dual intermediate relay and the dual contactor dual circuit output in series, so as to realize As long as one point in the dual circuit is disconnected, the main circuit can be powered off to achieve safe and reliable braking of the metallurgical overhead crane. In order to protect the circuit stability and power safety of the A-circuit output relay and the B-circuit output relay, the first resistor is connected in series with the first capacitor and then connected in parallel with the A-circuit output relay, and the second resistor is connected in series with the second capacitor and then connected in parallel with the B-circuit output relay. In order to intuitively display whether the second circuit breaker, the normally open contacts of the A-circuit output relay and the normally open contacts of the B-circuit output relay are normally connected and energized, the A-circuit output contactor is connected in parallel with the A-circuit output indicator light, and the B-circuit output contactor is connected in parallel with the B-circuit output indicator light. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a circuit schematic diagram of the present invention. DETAILED DESCRIPTION

[0011] like Figure 1 As shown, a device for controlling the holding brake of a metallurgical crane with dual-circuit output in series comprises a first circuit breaker 1, a second circuit breaker 9 and a combined circuit breaker 14, the inlet terminals of the first circuit breaker 1, the second circuit breaker 9 and the combined circuit breaker 14 are respectively connected to the live wire, the outlet terminal of the first circuit breaker 1 is connected to the digital output module 2, the Q0.0 and Q0.1 terminals of the digital output module are respectively connected to the A-circuit output relay 3 and the B-circuit output relay 6, the A-circuit output relay 3 and the B-circuit output relay 6 are respectively connected to the neutral line, the outlet terminal of the second circuit breaker 9 is respectively connected to the A-circuit output relay normally open contact 17 and the B-circuit output relay normally open contact 18, the A-circuit output relay normally open contact 17 is connected to the neutral line through the A-circuit output contactor 10, and the B-circuit output relay is connected to the neutral line. The output relay normally open contact 18 is connected to the neutral line through the B-loop output contactor 12, the output terminal of the combination circuit breaker 14 is connected to the A-loop output contactor normally open contact 19, the A-loop output contactor normally open contact 19 is connected to the B-loop output contactor normally open contact 20, the B-loop output contactor normally open contact 20 is respectively connected to the first brake motor 15 and the second brake motor 16, the A-loop output relay 3 is connected in parallel with the first resistor 4, the first resistor 4 is connected in series with the first capacitor 5 and then connected to the neutral line, the B-loop output relay 6 is connected in parallel with the second resistor 7, the second resistor 7 is connected in series with the second capacitor 8 and then connected to the neutral line, the A-loop output contactor 10 is connected in parallel with the A-loop output indicator light 11, and the B-loop output contactor 12 is connected in parallel with the B-loop output indicator light 13.

[0012] When the present invention is in use, the first circuit breaker 1 is closed, the PLC dual-channel output circuit is powered on, the second circuit breaker 9 is closed, the electrical control circuit is powered on, the combined circuit breaker 14 is closed, the electrical main circuit is powered on, and when the metallurgical crane needs to open the brake, the PLC program controls the dual-channel outputs Q0.0 and Q0.1 of the digital output module 2, Q0.0 controls the output of the A circuit, and Q0.1 controls the output of the B circuit. The coils of the A-loop output relay 3 and the B-loop output relay 6 are electrically attracted, and the normally open contacts 17 and 18 of the A-loop output relay are closed, so that the coils of the A-loop output contactor 10 and the B-loop output contactor 12 are electrically attracted, and the normally open contacts 19 and 20 of the A-loop output contactor are closed, and the first brake motor 15 and the second brake motor 16 work to open the brake. At the same time, the first resistor 4 and the first capacitor 5 work, and the second resistor 7 and the second capacitor 8 work, and the A-loop output indicator light 11 lights up, and the B-loop output indicator light 13 lights up, realizing the dual-loop output series control of the metallurgical crane brake opening. On the contrary, when the metallurgical crane needs to close the holding brake, the PLC program controls the digital output module 2 to cancel the dual-channel output Q0.0 / Q0.1, the A-loop output relay 3 and the B-loop output relay 6 coils lose power, the A-loop output relay normally open contact 17 and the B-loop output relay normally open contact 18 are disconnected, the A-loop output contactor 10 and the B-loop output contactor 12 coils lose power, the A-loop output contactor normally open contact 19 and the B-loop output contactor normally open contact 20 are disconnected, the first holding brake motor 15 and the second holding brake motor 16 stop working, and the metallurgical crane holding brake is closed.

Claims

1. A device for controlling the holding brake of a metallurgical crane in series with dual-circuit output, characterized in that: The invention comprises a first circuit breaker (1), a second circuit breaker (9) and a combined circuit breaker (14), wherein the incoming terminals of the first circuit breaker (1), the second circuit breaker (9) and the combined circuit breaker (14) are respectively connected to a live wire, the outgoing terminal of the first circuit breaker (1) is connected to a digital output module (2), the Q0.0 and Q0.1 terminals of the digital output module are respectively connected to an A-circuit output relay (3) and a B-circuit output relay (6), the A-circuit output relay (3) and the B-circuit output relay (6) are respectively connected to a neutral wire, and the outgoing terminals of the second circuit breaker (9) are respectively connected to a normally open contact (17) of the A-circuit output relay. ) and a normally open contact (18) of a B-loop output relay, the normally open contact (17) of the A-loop output relay is connected to a neutral line via an A-loop output contactor (10), the normally open contact (18) of the B-loop output relay is connected to a neutral line via a B-loop output contactor (12), the outlet terminal of the combined circuit breaker (14) is connected to a normally open contact (19) of the A-loop output contactor, the normally open contact (19) of the A-loop output contactor is connected to a normally open contact (20) of the B-loop output contactor, and the normally open contact (20) of the B-loop output contactor is connected to a first brake motor (15) and a second brake motor (16), respectively; The A-loop output relay (3) is connected in parallel with a first resistor (4), which is connected in series with a first capacitor (5) and then connected to a neutral line; the B-loop output relay (6) is connected in parallel with a second resistor (7), which is connected in series with a second capacitor (8) and then connected to a neutral line; the A-loop output contactor (10) is connected in parallel with an A-loop output indicator light (11), and the B-loop output contactor (12) is connected in parallel with a B-loop output indicator light (13); When the first circuit breaker (1) is closed, the PLC dual-channel output circuit is energized and operated, when the second circuit breaker (9) is closed, the electrical control circuit is energized and operated, when the combination circuit breaker (14) is closed, the electrical main circuit is energized and operated, when the metallurgical overhead crane needs to open the holding brake, the PLC program controls the dual-channel outputs Q0.0 and Q0.1 of the digital output module (2), Q0.0 controls the output of the A circuit, and Q0.1 controls the output of the B circuit. The coils of the A-circuit output relay (3) and the B-circuit output relay (6) are electrically attracted, and the normally open contact (17) of the A-circuit output relay and the normally open contact (18) of the B-circuit output relay are closed, so that the coils of the A-circuit output contactor (10) and the B-circuit output contactor (12) are electrically attracted, and the normally open contact (19) of the A-circuit output contactor and the normally open contact (20) of the B-circuit output contactor are closed, and the first brake motor (15) and the second brake motor (16) are operated to complete the opening of the brake, and at the same time, the first resistor (4) and the first capacitor (5) are operated, and the second resistor (7) and the second capacitor (8) are operated, and the A-circuit output indicator light (11) is lit, and the B-circuit output indicator light (13) is lit, so that the double-circuit output series control of the metallurgical crane brake is opened.

Images