Live-line work prevention protection system for direct-current electrolytic cell

Abstract

The utility model discloses a direct current electrolytic bath live-line work prevention protection system which comprises an electromagnetic switch, the electromagnetic switch is installed on a crane, the electromagnetic switch is used for sensing a magnetic field around a pole plate in an electrolytic bath, the crane comprises a control box, a first control loop and a second control loop are arranged in the control box, and the first control loop comprises a control switch. The control switch is connected with the control end of the executing mechanism, the executing mechanism is used for executing crane operation, the second control loop comprises a controlled part of the control switch, and the controlled part of the control switch is connected with the electromagnetic switch in series. According to the utility model, the electromagnetic switch is used for detecting the magnetic field intensity around the surface of the electrolytic bath to detect the power-off condition of the electrolytic bath, and the first control loop and the second control loop are interlocked to control the operation of the crane.

Description

Technical Field

[0001] The utility model belongs to the field of electrolysis or electrowinning in the metallurgical process, and particularly relates to a protection system for preventing live working in a DC electrolytic cell. Background Art

[0002] Electrolysis and electrowinning technologies are important applications in the field of electrochemistry, and they play a key role in many industrial processes, such as the production of metals such as copper, nickel, lead, zinc, and aluminum. In this technology, a cathode, an anode, and an electrolyte are arranged in an electrolytic cell or an electrowinning cell. Under the action of direct current, relatively pure metal products are deposited on the cathode, realizing the enrichment and purification of the target metal. With the continuous improvement of the industrialization scale, the current intensity of the direct current used in the electrolysis process is getting higher and higher, and applications range from 1000 A to over 500000 A. Due to the high current intensity, the direct current must be disconnected during the out-of-tank operation. According to the current intensity and the switch settings, the current power-off methods are divided into single-tank power-off, grouped power-off, full-series power-off, etc. In actual production, there have been repeated occurrences in many enterprises of overhead crane live lifting operations caused by reasons such as inadequate power-off confirmation, power-off switch failures, and human misoperations. During this process, a strong current is likely to form an electric arc, leading to production accidents such as cell explosion and rectifier system tripping, seriously threatening personnel safety and equipment safety. Currently, the methods for dealing with such accidents are mostly management measures, relying on operators to improve their sense of responsibility and strengthen verification, etc.; however, the above management measures cannot fundamentally avoid overhead crane live lifting operations and cannot completely eliminate such accident hazards. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art, improve the safety of the electrolysis out-of-tank operation, and provide a protection system for preventing live working in a DC electrolytic cell.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A protection system for preventing live working in a DC electrolytic cell includes an electromagnetic switch, the electromagnetic switch is installed on an overhead crane, the electromagnetic switch is used to sense the magnetic field around the electrode plate in the electrolytic cell, the overhead crane includes a control box, a first control circuit and a second control circuit are arranged in the control box, the first control circuit includes a control switch, the control switch is connected to the control end of an actuator, the actuator is used to perform the overhead crane operation, and the second control circuit includes a controlled part of the control switch, and the controlled part of the control switch and the electromagnetic switch are connected in series.

[0006] The utility model detects the magnetic field intensity around the electrolytic cell surface through the electromagnetic switch to detect the power-off situation of the electrolytic cell, and performs interlocking through the first control circuit and the second control circuit to control the overhead crane operation.

[0007] Preferably, the first control loop is used to control the rise of the actuator, and the control switch is connected to the rise control end of the actuator.

[0008] Preferably, the actuator includes a motor and a sling, the sling is in driving connection with the output shaft of the motor, and the control switch is connected to the control end of the motor.

[0009] Preferably, the electromagnetic switch is provided on the sling.

[0010] Preferably, the control switch adopts a main contact of a contactor, and the controlled part of the control switch adopts a coil of the contactor.

[0011] Preferably, the cell surface of the electrolytic cell is one of copper, nickel, lead, zinc or aluminum electrolytic cell surfaces.

[0012] Preferably, the electromagnetic switch is a reed switch or a Hall switch.

[0013] Preferably, the height between the electromagnetic switch and the electrode plate is 1 to 100 cm.

[0014] Preferably, the first control loop further includes a first switch group, which is connected in series with the control switch, and the first switch group is used to control the first control loop to be turned on and off.

[0015] Preferably, the second control loop further includes a second switch group, the second switch group is connected in series with the electromagnetic switch, and the second switch group is used to control the second control loop to be turned on and off.

[0016] The utility model realizes interlock control of the lifting and rising operation of the crane, eliminates the risk of tank explosion and rectifier tripping caused by the crane lifting the pole plate with power on when the tank surface is not powered off during the electrolysis operation, and ensures the safety of personnel and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is described in further detail below with reference to the accompanying drawings:

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 This is a circuit diagram of the first control loop of the utility model;

[0020] Figure 3 It is a circuit diagram of the second control loop of the utility model.

[0021] Explanation of the accompanying reference numerals: 1. electrolytic cell; 2. electrode plate; 3. electromagnetic switch; 4. wire; 5. crane; 51. lifting device; 52. control box; 53. motor. DETAILED DESCRIPTION

[0022] As Figure 1 shown, a protection system for preventing live working on a DC electrolytic cell provided by the present utility model includes an electromagnetic switch 3, the electromagnetic switch 3 is installed on a crane 5, and the electromagnetic switch 3 is used to sense the magnetic field around the electrode plate 2 in the electrolytic cell 1. The crane 5 includes a control box 52, and a first control circuit and a second control circuit are arranged in the control box 52. The first control circuit is used to control the ascending of the actuator. The electromagnetic switch 3 is connected to the second control circuit through a wire 4. The actuator is used to perform the crane operation. The actuator includes a motor 53 and a lifting appliance 51, and the electromagnetic switch 3 is arranged on the lifting appliance 51. The lifting appliance 51 is in transmission connection with the output shaft of the motor 53.

[0023] As Figure 2 shown, the first control circuit includes a control switch and a first switch group. The control switch adopts the main contact KM-1 of a contactor, and the main contact KM-1 of the contactor is connected to the ascending control end of the motor M. The first switch group includes a circuit breaker Q1, a disconnection switch K1 and a gear switch K2. The circuit breaker Q1 is used to achieve overcurrent thermal protection. The disconnection switch K1 is used to disconnect the main power supply of the motor M. The gear switch K2 is used for gear switching. The present utility model detects the magnetic field intensity around the electrolytic cell surface through the electromagnetic switch to detect the power-off situation of the electrolytic cell, and performs interlocking through the first control circuit and the second control circuit to control the crane operation.

[0024] As Figure 3 shown, the second control circuit includes the controlled part of the control switch and a second switch group. The controlled part of the control switch adopts the coil KM of a contactor, and the coil KM of the contactor is connected in series with the electromagnetic switch GHG. The second switch group includes a power control switch K3, an emergency switch K4 and a limit switch K5. The power control switch K3 is used to control the on-off of the power supply of the second control circuit. The emergency switch K4 is used to quickly cut off the second control circuit of the control coil KM. The limit switch K5 is used to limit the ascending distance of the lifting appliance in the actuator to prevent ascending beyond the safe height and damaging the pulley block.

[0025] The electromagnetic switch adopts a normally closed switch. The electromagnetic switch can adopt a reed switch or a Hall switch. In this embodiment, a normally closed reed switch GHG is adopted.

[0026] In this embodiment, the surface of the electrolytic cell 1 is one of the surfaces of copper, nickel, lead, zinc or aluminum electrolytic cells.

[0027] In this embodiment, since the current passing through the electrode plate 2 is relatively high, the generated magnetic field intensity is large, and the induction range of the electromagnetic switch 3 also increases accordingly. Therefore, the height between the electromagnetic switch 3 and the electrode plate 2 is 1 - 100 cm.

[0028] In this embodiment, during actual use: The sling 51 descends, driving the electromagnetic switch 3 to descend to a certain height range from the electrode plate 2 in the electrolytic cell 1, preparing for the lifting operation. When the electrolytic cell surface is not completely de-energized, the direct current passing through the electrode plate 2 forms an electromagnetic field around the electrode plate 2. The electromagnetic switch 3 senses the electromagnetic intensity, and then the signal sensed by the electromagnetic switch 3 is connected to the control box 52 of the crane 5 through the wire 4. Through the interlock of the second control circuit and the first control circuit in the control box 52, after the normally closed electromagnetic switch 3 receives the electromagnetic signal, the second control circuit is disconnected, the coil KM loses power, so that the contactor contact KM1 of the first control circuit cannot be closed, and the motor M in the actuator will also not be able to operate, thereby preventing the sling 51 from performing the ascending action and realizing the prevention of the occurrence of live lifting accidents.

[0029] The utility model realizes the interlock control of the lifting operation of the crane, eliminates the risks of explosion of the electrolytic cell and rectifier tripping caused by the live lifting of the electrode plate by the crane during the electrolysis operation when the cell surface is not de-energized, and ensures the safety of personnel and equipment.

[0030] The above is only the preferred embodiment of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the utility model should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope defined by the claims.

Claims

1. A protection system for preventing live working on a DC electrolytic cell, characterized in that, It includes an electromagnetic switch which is installed on a crane. The electromagnetic switch is used to sense the magnetic field around the electrode plates in the electrolytic cell. The crane includes a control box, and a first control circuit and a second control circuit are arranged in the control box. The first control circuit includes a control switch which is connected to the control end of an actuator. The actuator is used to perform crane operations. The second control circuit includes the controlled part of the control switch, and the controlled part of the control switch and the electromagnetic switch are connected in series.

2. The DC electrolytic cell anti-electrified operation protection system according to claim 1, wherein, The first control circuit is used to control the ascending of the actuator, and the control switch is connected to the ascending control end of the actuator.

3. The DC electrolytic cell anti-electrified operation protection system according to claim 1, wherein, The actuator includes a motor and a lifting appliance. The lifting appliance is in transmission connection with the output shaft of the motor, and the control switch is connected to the control end of the motor.

4. The DC electrolytic cell anti-electrified operation protection system according to claim 3, wherein, The electromagnetic switch is arranged on the lifting appliance.

5. The DC electrolytic cell anti-electrified operation protection system according to claim 1, wherein, The control switch uses the main contact of a contactor, and the controlled part of the control switch uses the coil of the contactor.

6. The DC electrolytic cell anti-electrified operation protection system according to claim 1, characterized in that, The surface of the electrolytic cell is one of the surfaces of copper, nickel, lead, zinc or aluminum electrolytic cells.

7. The DC electrolytic cell anti-electrified operation protection system according to claim 1, characterized in that, The electromagnetic switch uses a reed switch or a Hall switch.

8. The DC electrolytic cell anti-electrified operation protection system according to claim 1, characterized in that, The height between the electromagnetic switch and the electrode plate is 1 to 100 cm.

9. The DC electrolytic cell anti-electrified operation protection system according to claim 1, characterized in that, The first control circuit further includes a first switch group which is connected in series with the control switch. The first switch group is used to control the opening and closing of the first control circuit.

10. The DC electrolytic cell anti-electrified operation protection system according to claim 1, characterized in that, The second control circuit further includes a second switch group which is connected in series with the electromagnetic switch. The second switch group is used to control the opening and closing of the second control circuit.

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