Electric control system of hydraulic station for opening and blocking eyes in front of a submerged arc furnace

Abstract

This invention discloses an electrical control system for a hydraulic station for opening and plugging holes in a submerged arc furnace, comprising a power supply circuit, a main control switch K3, a first sub-control switch K1, a second sub-control switch K2, a first execution control unit, and a second execution control unit. The first sub-control switch K1 is connected in series with the end of the main control switch K3 furthest from the power supply circuit; the second sub-control switch K2 is connected in series with the end of the main control switch K3 furthest from the power supply circuit; the first execution control unit is connected in series with the end of the first sub-control switch K1 furthest from the main control switch K3; and the second execution control unit is connected in series with the end of the second sub-control switch K2 furthest from the main control switch K3. This scheme controls oil pump No. 1 through the first sub-control switch K1 and the first execution control unit, and controls oil pump No. 2 through the second sub-control switch K2 and the second execution control unit. This ensures that even if one oil pump malfunctions during the opening and plugging of the holes, the other oil pump can still guarantee continuous and stable production.

Description

Technical Field

[0001] This invention relates to the field of smelting production control technology, and in particular to an electrical control system for a hydraulic station for opening and closing holes in a submerged arc furnace. Background Technology

[0002] Submerged arc furnaces are key smelting equipment in the ferroalloy and calcium carbide industries, and the opening and closing of the furnace openings are crucial steps in the production process. Traditionally, these operations were performed manually, which was time-consuming and labor-intensive. Each opening or closing operation often required multiple workers to coordinate, leading to prolonged operation times, excessive heat loss from the furnace, and extended smelting cycles. Furthermore, the splashing of high-temperature molten metal and backfire from oxygen blowing pipes within the submerged arc furnace could cause burns and scalds to operators, and even fires and explosions.

[0003] Therefore, electrical control systems are currently used to drive oil pumps for opening and plugging holes in submersible arc furnaces, replacing manual labor. However, existing electrical control systems typically employ a single-pump independent control mode, meaning one control system controls only the start and stop of one pump. This structure lacks a backup mechanism; if a single control loop or oil pump fails, the machine must be shut down for maintenance before the opening and plugging operation can resume. This not only wastes time but also interrupts the production process, severely impacting the stability of continuous production. In view of this, this solution proposes an electrical control system for the hydraulic station at the furnace front of the submersible arc furnace to address the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide an electrical control system for the hydraulic station of the furnace front opening and plugging hole of a submerged arc furnace, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an electrical control system for a hydraulic station for opening and closing holes in a submerged arc furnace, used for parallel operation control of oil pump No. 1 and oil pump No. 2, comprising: Power supply circuit; The master control switch K3 is connected in series in the output circuit of the power supply circuit; The first sub-control switch K1 is connected in series at the end of the main control switch K3 that is furthest from the power supply circuit; The second sub-control switch K2 is connected in series at the end of the main control switch K3 that is furthest from the power supply circuit, and is connected in parallel with the first sub-control switch K1; The first execution control unit is connected in series at the end of the first sub-control switch K1 that is away from the main control switch K3. The output circuit of the first execution control unit is electrically connected to the control terminal of oil pump No. 1 for the start and stop control of oil pump No. 1. The second execution control unit is connected in series at the end of the second sub-control switch K2 that is furthest from the main control switch K3. The output circuit of the second execution control unit is electrically connected to the control terminal of the No. 2 oil pump for the start and stop control of the No. 2 oil pump.

[0006] Preferably, the power supply circuit includes three-phase power supplies L1, L2, L3 and a neutral line N. The three-phase power supplies L1, L2 and L3 are respectively connected to the input terminal of the main control switch K3. The neutral line N is connected to the common neutral line terminal of the first execution control unit and the second execution control unit, providing a working neutral line for the control circuits in the first execution control unit and the second execution control unit respectively. The control terminal of the No. 1 oil pump is equipped with a first start coil KM1. 线圈 and the first start indicator light HR1, and the first start coil KM1 线圈 It is connected in parallel with the first indicator light HR1 in the control circuit of oil pump No. 1; The control terminal of the No. 2 oil pump is equipped with a second start coil KM2. 线圈 The second start indicator light HR2, and the second start coil KM2 线圈 The second indicator light HR2 is connected in parallel to the control circuit of oil pump No. 2.

[0007] Preferably, the first execution control unit includes: The first main contact switch KM1 is connected in series at the end of the first sub-control switch K1 that is away from the main control switch K3, and is used to switch the power supply of the No. 1 oil pump on and off. The first thermal relay RJ1 is connected in series at the end of the first main contact switch KM1 away from the first sub-control switch K1, and is used for mechanical protection against overload and phase loss of the No. 1 oil pump. The first motor integrated protector ZB1 is connected in series with the first thermal relay RJ1 and the first starting coil KM1. 线圈 Electronic protection between the circuits for the stall, underload, three-phase imbalance and start-up timeout of the No. 1 oil pump.

[0008] Preferably, the first main contact switch KM1 includes: The first spring switch SB1 is connected in series at the end of the first sub-control switch K1 that is furthest from the main control switch K3; The second spring switch SB2 is connected in series between the circuit of the first spring switch SB1 and the circuit of the first thermal relay RJ1; First normally open contact switch KM1 常 It is connected in parallel between the circuits of the first spring switch SB1 and the first thermal relay RJ1, and passes through the first starting coil KM1. 线圈 After being powered on, it controls the first normally open contact switch KM1. 常Close the switch to start oil pump No. 1.

[0009] Preferably, the control terminals of oil pump 1 and oil pump 2 are further connected in parallel with loading solenoid valve Y1 and loading solenoid valve Y2 for oil pressure control of oil pump 1 and / or oil pump 2. A first loading intermediate relay KA1 is connected in series in the control circuit of loading solenoid valve Y1 for controlling the on / off state of loading solenoid valve Y1.

[0010] Preferably, the control circuit of the No. 1 loading solenoid valve Y1 includes: The fifth spring switch SB5 is connected at one end to the phase line output terminal of the main control switch K3; The sixth spring switch SB6 is connected in series with the end of the fifth spring switch SB5 that is furthest from the main control switch K3; First loading coil KA1 线圈 The first loading coil KA1 is connected in series at the end of the sixth spring switch SB6 furthest from the fifth spring switch SB5. 线圈 The end of the switch away from the sixth spring switch SB6 is electrically connected to the neutral wire N; First intermediate relay normally open contact KA1 常 It is connected in parallel to both ends of the sixth spring switch SB6, and passes through the first loading coil KA1. 线圈 After being energized, it controls the normally open contact KA1 of the first intermediate relay. 常 Closed, for starting the No. 1 loading solenoid valve Y1; The first loading indicator light HR3 is connected in parallel to the sixth spring switch SB6 and the first loading coil KA1. 线圈 On the circuit.

[0011] Preferably, the second execution control unit includes: The second main contact switch KM2 is connected in series at the end of the second sub-control switch K2 that is away from the main control switch K3, and is used to switch the power supply on and off for the No. 2 oil pump. The second thermal relay RJ2 is connected in series at the end of the second main contact switch KM2 away from the second sub-control switch K2, and is used for mechanical protection against overload and phase loss of the No. 2 oil pump; The second motor integrated protector ZB2 is connected in series with the second thermal relay RJ2 and the second starting coil KM2. 线圈 Electronic protection for the No. 2 oil pump in the circuit, including protection against stall, underload, three-phase imbalance and start-up timeout.

[0012] Preferably, the second main contact switch KM2 includes: The third spring switch SB3 is connected in series at the end of the second sub-control switch K2 that is furthest from the main control switch K3; The fourth spring switch SB4 is connected in series between the circuit of the third spring switch SB3 and the circuit of the second thermal relay RJ2; Second normally open contact switch KM2 常 It is connected in parallel between the circuit of the third spring switch SB3 and the second thermal relay RJ2, and passes through the second starting coil KM2. 线圈 After being powered on, it controls the second normally open contact switch KM2. 常 Close the switch to start oil pump number 2.

[0013] Preferably, a second loading intermediate relay KA2 is connected in series in the control circuit of the second loading solenoid valve Y2 to control the on / off state of the second loading solenoid valve Y2.

[0014] Preferably, the control circuit of the second loading solenoid valve Y2 includes: The seventh spring switch SB7 is connected at one end to the phase line output terminal of the main control switch K3; The eighth spring switch SB8 is connected in series with the end of the seventh spring switch SB7 that is furthest from the main control switch K3; Second loading coil KA2 线圈 The second loading coil KA2 is connected in series at the end of the eighth spring switch SB8 furthest from the seventh spring switch SB7. 线圈 The end of the eighth spring switch SB8 that is furthest from the ground wire N is electrically connected; Second intermediate relay normally open contact KA2 常 It is connected in parallel to both ends of the eighth spring switch SB8, and passes through the second loading coil KA2. 线圈 After being energized, it controls the normally open contact KA2 of the second intermediate relay. 常 Closed, for starting the No. 2 loading solenoid valve Y2; The second loading indicator light HR4 is connected in parallel to the eighth spring switch SB8 and the second loading coil KA2. 线圈 On the circuit.

[0015] The technical effects and advantages of this invention are as follows: This scheme controls oil pump No. 1 through the first sub-control switch K1 and the first execution control unit, and controls oil pump No. 2 through the second sub-control switch K2 and the second execution control unit. Oil pump No. 1 and oil pump No. 2 are controlled in parallel in this control system. When the system performs oil pump control for opening and closing the plug, oil pump No. 1 and oil pump No. 2 form two oil pump controls with backup. Even if one oil pump fails, the other oil pump can be operated to ensure continuous and stable production. Attached Figure Description

[0016] Figure 1 This is the control circuit diagram of the electrical control system of the present invention.

[0017] Figure 2 This is the main control circuit diagram of the electrical control system of the present invention.

[0018] Figure 3 This is a circuit diagram of the electrical control system for the oil pump start / stop and oil pressure loading control of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides, for example Figure 1 - Figure 3 The diagram shows an electrical control system for a hydraulic station used for opening and closing holes in a submerged arc furnace. This system is used for the parallel operation control of oil pumps No. 1 and No. 2. The control terminal of oil pump No. 1 is equipped with a first start coil KM1. 线圈 and the first start indicator light HR1, and the first start coil KM1 线圈 The first start indicator light HR1 is connected in parallel to the control circuit of oil pump No. 1. In actual settings, the first start indicator light HR1 is used to display the starting and running status of the No. 1 oil pump motor. Normally, a green light indicates normal operation, and a red light indicates abnormal operation. To ensure a clear display of the No. 1 oil pump, a spare first start indicator light HB1' is also connected in parallel, so that even if the first start indicator light HR1 fails, the spare first start indicator light HB1' can still be used to display the motor running status of oil pump No. 1. The control terminal of oil pump No. 2 is equipped with a second start coil KM2. 线圈 And the second start indicator light HR2, and the second start coil KM2 线圈 The second start indicator HR2 is connected in parallel to the control circuit of oil pump No. 2. In the actual setting, the second start indicator HR2 is used to display the running status of the motor of oil pump No. 2. The display logic is the same as that of the first start indicator HR1. Normally, a green light indicates normal operation and a red light indicates abnormal operation. Similarly, in order to ensure the intuitive display of oil pump No. 2, a spare second start indicator HB2' is also connected in parallel to ensure that even if the second start indicator HR2 is damaged, the spare second start indicator HB2' can be used to display the motor running status of oil pump No. 2. It includes a power supply circuit, a main control switch K3, a first sub-control switch K1, a second sub-control switch K2, a first execution control unit, and a second execution control unit. Specifically, the power supply circuit includes three-phase power supplies L1, L2, and L3 and a neutral line N. The three-phase power supplies L1, L2, and L3 are respectively connected to the input terminal of the main control switch K3. The neutral line N is connected to the common neutral line terminal of the first execution control unit and the second execution control unit, providing working neutral lines for the control circuits in the first execution control unit and the second execution control unit respectively. The positive power output is provided through the three-phase power supplies L1, L2, and L3, and the negative power output is provided through the neutral line N, thus forming a closed power supply loop.

[0021] The main control switch K3 is connected in series with the output circuit of the power supply circuit; the first sub-control switch K1 is connected in series with the end of the main control switch K3 away from the power supply circuit; the second sub-control switch K2 is connected in series with the end of the main control switch K3 away from the power supply circuit and is connected in parallel with the first sub-control switch K1. The first sub-control switch K1 and the second sub-control switch K2 are connected in parallel with the output circuit of the main control switch K3 and the power supply circuit, respectively executing the power-on control of oil pump No. 1 and oil pump No. 2.

[0022] The first execution control unit is connected in series at the end of the first sub-control switch K1 that is away from the main control switch K3. The output circuit of the first execution control unit is electrically connected to the control terminal of oil pump No. 1 for the start and stop control of oil pump No. 1. Specifically, the first execution control unit includes a first main contact switch KM1, a first thermal relay RJ1, and a first motor integrated protector ZB1; the first main contact switch KM1 is connected in series at the end of the first sub-control switch K1 furthest from the main control switch K3, and is used to switch the power supply on and off for the No. 1 oil pump; the first thermal relay RJ1 is connected in series at the end of the first main contact switch KM1 furthest from the first sub-control switch K1, and is used for mechanical protection against overload and phase loss of the No. 1 oil pump; the first motor integrated protector ZB1 is connected in series between the first thermal relay RJ1 and the first starting coil KM1. 线圈 Between the circuits, electronic protection is provided for the stall, underload, three-phase imbalance, and start-up timeout of oil pump No. 1. The mechanical and electronic protection of the motor section of oil pump No. 1 are respectively executed by the first thermal relay RJ1 and the first motor integrated protector ZB1 to ensure the normal start-up and operation of oil pump No. 1. At the same time, the operation of the motor section of oil pump No. 1 is monitored in real time. Once an abnormal operation occurs, the operation of the motor section of oil pump No. 1 is terminated through protection.

[0023] Furthermore, the first main contact switch KM1 includes a first spring switch SB1, a second spring switch SB2, and a first normally open contact switch KM1. 常The first spring switch SB1 is connected in series at the end of the first sub-control switch K1 furthest from the main control switch K3; the second spring switch SB2 is connected in series between the circuit of the first spring switch SB1 and the circuit of the first thermal relay RJ1; the first normally open contact switch KM1... 常 It is connected in parallel between the circuits of the first spring switch SB1 and the first thermal relay RJ1, and passes through the first starting coil KM1. 线圈 After being powered on, it controls the first normally open contact switch KM1. 常 The switch is closed to start oil pump No. 1; the first main contact switch KM1 controls the start of the motor section of oil pump No. 1 after the start control is activated.

[0024] The second execution control unit is connected in series at the end of the second sub-control switch K2 furthest from the main control switch K3. The output circuit of the second execution control unit is electrically connected to the control terminal of oil pump No. 2 for the start-stop control of oil pump No. 2. Specifically, the second execution control unit includes a second main contact switch KM2, a second thermal relay RJ2, and a second motor integrated protector ZB2. The second main contact switch KM2 is connected in series at the end of the second sub-control switch K2 furthest from the main control switch K3 for the on / off power supply of oil pump No. 2. The second thermal relay RJ2 is connected in series at the end of the second main contact switch KM2 furthest from the second sub-control switch K2 for mechanical protection against overload and phase loss of oil pump No. 2. The second motor integrated protector ZB2 is connected in series with the second thermal relay RJ2 and the second starting coil KM2. 线圈 Between the circuits, electronic protection is provided for the stall, underload, three-phase imbalance, and start-up timeout of oil pump No. 2. The mechanical and electronic protection of the motor section of oil pump No. 2 are respectively implemented through the second thermal relay RJ2 and the second motor integrated protector ZB2 to ensure the normal start-up and operation of oil pump No. 2. At the same time, the operation of the motor section of oil pump No. 2 is monitored in real time. Once an abnormal operation occurs, the operation of the motor section of oil pump No. 2 is terminated through protection.

[0025] Furthermore, the second main contact switch KM2 includes a third spring switch SB3, a fourth spring switch SB4, and a second normally open contact switch KM2. 常 The third spring switch SB3 is connected in series at the end of the second sub-control switch K2 furthest from the main control switch K3; the fourth spring switch SB4 is connected in series between the third spring switch SB3 and the circuit of the second thermal relay RJ2; the second normally open contact switch KM2... 常 It is connected in parallel between the circuit of the third spring switch SB3 and the second thermal relay RJ2, and passes through the second starting coil KM2. 线圈 After being powered on, it controls the second normally open contact switch KM2. 常 The second main contact switch KM2 is closed to start the No. 2 oil pump; the second main contact switch KM2 controls the start of the No. 2 oil pump motor after starting.

[0026] Furthermore, the control terminals of oil pump 1 and oil pump 2 are also connected in parallel with loading solenoid valves Y1 and Y2 for oil pressure control of oil pump 1 and / or oil pump 2. In this scheme, the combination of oil pump 1 and oil pump 2 with loading solenoid valves Y1 and Y2 makes the motors of oil pump 1 and oil pump 2 and loading solenoid valves Y1 and Y2 mutually redundant. Normally, operating one oil pump and one loading circuit is sufficient to meet the requirements. If one oil pump fails, the other one is immediately started to ensure normal production needs.

[0027] The control circuit of loading solenoid valve Y1 is connected in series with the first loading intermediate relay KA1, which is used to control the on / off state of loading solenoid valve Y1; the control circuit of loading solenoid valve Y1 includes the fifth spring switch SB5, the sixth spring switch SB6, and the first loading coil KA1. 线圈 KA1, the normally open contact of the first intermediate relay 常 The first loading indicator light HR3; one end of the fifth spring switch SB5 is connected to the phase output terminal of the main control switch K3; the sixth spring switch SB6 is connected in series with the end of the fifth spring switch SB5 furthest from the main control switch K3; the first loading coil KA1 线圈 Connected in series at the end of the sixth spring switch SB6 furthest from the fifth spring switch SB5, and the first loading coil KA1 线圈 The end of the sixth spring switch SB6 away from the neutral line N is electrically connected; the normally open contact KA1 of the first intermediate relay 常 Connected in parallel across the two ends of the sixth spring switch SB6, and through the first loading coil KA1 线圈 After being energized, the normally open contact KA1 of the first intermediate relay is controlled. 常 Closed for starting the No. 1 loading solenoid valve Y1; the first loading indicator light HR3 is connected in parallel to the sixth spring switch SB6 and the first loading coil KA1. 线圈 On the circuit.

[0028] The control circuit of loading solenoid valve Y2 (number 2) is connected in series with a second loading intermediate relay KA2 to control the on / off state of loading solenoid valve Y2; the control circuit of loading solenoid valve Y2 includes a seventh spring switch SB7, an eighth spring switch SB8, and a second loading coil KA2. 线圈 KA2, the normally open contact of the second intermediate relay 常 The second loading indicator light HR4; one end of the seventh spring switch SB7 is connected to the phase line output terminal of the main control switch K3; the eighth spring switch SB8 is connected in series with the end of the seventh spring switch SB7 furthest from the main control switch K3; the second loading coil KA2 线圈 The second loading coil KA2 is connected in series at the end of the eighth spring switch SB8 furthest from the seventh spring switch SB7. 线圈One end of the eighth spring switch SB8 is electrically connected to the neutral line N; the normally open contact KA2 of the second intermediate relay 常 It is connected in parallel across the two ends of the eighth spring switch SB8, and passes through the second loading coil KA2. 线圈 After being energized, it controls the normally open contact KA2 of the second intermediate relay. 常 Closed for starting the No. 2 loading solenoid valve Y2; the second loading indicator light HR4 is connected in parallel to the eighth spring switch SB8 and the second loading coil KA2. 线圈 On the circuit.

[0029] It should be noted that, in this scheme, when controlling the operation of oil pump No. 1 and oil pump No. 2, the switches performing the control include the first spring switch SB1, the second spring switch SB2, the third spring switch SB3, the fourth spring switch SB4, the fifth spring switch SB5, the sixth spring switch SB6, the seventh spring switch SB7, and the eighth spring switch SB8. To ensure the fault tolerance of the operation control, these switches are equipped with backup structures, including backup first spring switch SB1', backup second spring switch SB2', backup third spring switch SB3', backup fourth spring switch SB4', backup fifth spring switch SB5', backup sixth spring switch SB6', backup seventh spring switch SB7', and backup... The eighth spring switch SB8' and the spare switches are respectively connected in parallel at the corresponding control switch positions. Among these switches, the first spring switch SB1, the spare first spring switch SB1', the third spring switch SB3, the spare third spring switch SB3', the fifth spring switch SB5, the spare fifth spring switch SB5', the seventh spring switch SB7, and the spare seventh spring switch SB7' are all start control switches, while the second spring switch SB2, the spare second spring switch SB2', the fourth spring switch SB4, the spare fourth spring switch SB4', the sixth spring switch SB6, the spare sixth spring switch SB6', the eighth spring switch SB8, and the spare eighth spring switch SB8' are all stop switches.

[0030] In actual control operations, when operating oil pump No. 1 and / or oil pump No. 2, the following operations need to be performed: When starting up oil pump No. 1, first close the first sub-control switch K1, the second sub-control switch K2, and the main control switch K3 before starting. The motor operation protection for oil pump No. 1 is achieved through the first thermal relay RJ1 and the first motor integrated protector ZB1. The first main contact switch KM1 is controlled by the first starting coil KM1. 线圈 Control; When operating oil pump No. 1, at least the first sub-control switch K1 and the main control switch K3 must be closed. After the first sub-control switch K1 and the main control switch K3 are closed, press the first spring switch SB1 or the standby first spring switch SB1'. At this time, the first loading coil KA1... 线圈When power is applied, the first start indicator light HR1 or the backup first start indicator light HB1' illuminates, and simultaneously the first normally open contact switch KM1... 常 When closed, a self-locking mechanism is formed. At this time, the first main contact switch KM1 is closed, the motor of oil pump No. 1 is energized, and the oil pump runs. To stop the operation of oil pump No. 1, press the second spring switch SB2 or the standby second spring switch SB2'. At this time, the first start coil KM1 in the control circuit... 线圈 When power is lost, the first main contact switch KM1 disconnects again, and the motor of oil pump No. 1 stops running due to power failure.

[0031] After the motor of oil pump No. 1 starts running, press the sixth spring switch SB6 or the standby sixth spring switch SB6'. At this time, the first loading coil KA1 of the No. 1 loading solenoid valve Y1, which controls the oil pressure of oil pump No. 1, will activate. 线圈 When energized, the normally open contact KA1 of the first intermediate relay... 常 When closed, solenoid valve Y1 (loading solenoid valve 1) is energized. After Y1 is activated, it increases the oil pressure of oil pump 1 until the pressure reaches the predetermined production requirement. To stop the oil pressure loading of oil pump 1, press the fifth spring switch SB5 or the standby fifth spring switch SB5'. At this time, the first loading coil KA1... 线圈 Power failure, and simultaneously the normally open contact KA1 of the first intermediate relay 常 Disconnection occurs when the first loading intermediate relay KA1 is disconnected, the first loading solenoid valve Y1 is de-energized, and loading stops.

[0032] When starting the No. 2 oil pump, first close the first sub-control switch K1, the second sub-control switch K2, and the main control switch K3 before starting. The No. 2 oil pump motor is protected by the second thermal relay RJ2 and the second motor integrated protector ZB2. The second main contact switch KM2 is controlled by the second starting coil KM2. 线圈 Control: When operating oil pump No. 2, at least close the second sub-control switch K2 and the main control switch K3. After closing the second sub-control switch K2 and the main control switch K3, press the third spring switch SB3 or the standby third spring switch SB3'. At this time, the second loading coil KA2... 线圈 When power is applied, the second start indicator HR2 or the backup second start indicator HB2' illuminates, and the second normally open contact switch KM2 also illuminates. 常 When the circuit is closed, a self-locking mechanism is formed. At this time, the second main contact switch KM2 is closed, the motor of oil pump No. 2 is energized, and the oil pump starts running. To stop oil pump No. 2, press the fourth spring switch SB4 or the spare fourth spring switch SB4'. At this time, the second start coil KM2 in the control circuit... 线圈 When power is lost, the second main contact switch KM2 disconnects again, and the motor of oil pump No. 2 stops running due to power failure.

[0033] After the motor of oil pump No. 2 starts running, press the eighth spring switch SB8 or the spare eighth spring switch SB8'. At this time, the second loading coil KA2 of the No. 2 loading solenoid valve Y2, which controls the oil pressure of oil pump No. 2, will activate. 线圈 Power is applied, and simultaneously the normally open contact KA2 of the second intermediate relay... 常 When closed, solenoid valve Y2 (loading solenoid valve 2) is energized. After starting, solenoid valve Y2 increases the oil pressure of oil pump 2 until it reaches the required production pressure. To stop the oil pressure loading of oil pump 2, press the seventh spring switch SB7 or the standby seventh spring switch SB7'. At this time, the second loading coil KA2... 线圈 Power failure, and simultaneously the normally open contact KA2 of the second intermediate relay 常 Disconnection occurs, the second loading intermediate relay KA2 disconnects, the second loading solenoid valve Y2 loses power, and loading stops.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electrical control system for a hydraulic station for opening and closing holes in a submerged arc furnace, used for parallel operation control of oil pump No. 1 and oil pump No. 2, characterized in that, include: Power supply circuit; The master control switch K3 is connected in series in the output circuit of the power supply circuit; The first sub-control switch K1 is connected in series at the end of the main control switch K3 that is furthest from the power supply circuit; The second sub-control switch K2 is connected in series at the end of the main control switch K3 that is furthest from the power supply circuit, and is connected in parallel with the first sub-control switch K1; The first execution control unit is connected in series at the end of the first sub-control switch K1 that is away from the main control switch K3. The output circuit of the first execution control unit is electrically connected to the control terminal of oil pump No. 1 for the start and stop control of oil pump No.

1. The second execution control unit is connected in series at the end of the second sub-control switch K2 that is furthest from the main control switch K3. The output circuit of the second execution control unit is electrically connected to the control terminal of the No. 2 oil pump for the start and stop control of the No. 2 oil pump.

2. The electrical control system for the hydraulic station for opening and closing holes in a submerged arc furnace according to claim 1, characterized in that, The power supply circuit includes three-phase power supplies L1, L2, L3 and a neutral line N. The three-phase power supplies L1, L2 and L3 are respectively connected to the input terminal of the main control switch K3. The neutral line N is connected to the common neutral line terminal of the first execution control unit and the second execution control unit, providing a working neutral line for the control circuits in the first execution control unit and the second execution control unit respectively. The control terminal of the No. 1 oil pump is equipped with a first start coil KM1. 线圈 and the first start indicator light HR1, and the first start coil KM1 线圈 It is connected in parallel with the first indicator light HR1 in the control circuit of oil pump No. 1; The control terminal of the No. 2 oil pump is equipped with a second start coil KM2. 线圈 The second start indicator light HR2, and the second start coil KM2 线圈 The second indicator light HR2 is connected in parallel to the control circuit of oil pump No.

2.

3. The electrical control system for the hydraulic station for opening and closing holes in a submerged arc furnace according to claim 2, characterized in that, The first execution control unit includes: The first main contact switch KM1 is connected in series at the end of the first sub-control switch K1 that is away from the main control switch K3, and is used to switch the power supply of the No. 1 oil pump on and off. The first thermal relay RJ1 is connected in series at the end of the first main contact switch KM1 away from the first sub-control switch K1, and is used for mechanical protection against overload and phase loss of the No. 1 oil pump. The first motor integrated protector ZB1 is connected in series with the first thermal relay RJ1 and the first starting coil KM1. 线圈 Electronic protection between the circuits for the stall, underload, three-phase imbalance and start-up timeout of the No. 1 oil pump.

4. The electrical control system for the hydraulic station for opening and closing holes in a submerged arc furnace according to claim 3, characterized in that, The first main contact switch KM1 includes: The first spring switch SB1 is connected in series at the end of the first sub-control switch K1 that is furthest from the main control switch K3; The second spring switch SB2 is connected in series between the circuit of the first spring switch SB1 and the circuit of the first thermal relay RJ1; First normally open contact switch KM1 常 It is connected in parallel between the circuits of the first spring switch SB1 and the first thermal relay RJ1, and passes through the first starting coil KM1. 线圈 After being powered on, it controls the first normally open contact switch KM1. 常 Close the switch to start oil pump No.

1.

5. The electrical control system for the hydraulic station for opening and plugging holes in front of a submerged arc furnace according to claim 4, characterized in that, The control terminals of oil pump No. 1 and oil pump No. 2 are also connected in parallel with loading solenoid valves Y1 and Y2 for oil pressure control of oil pump No. 1 and / or oil pump No.

2. The control circuit of loading solenoid valve Y1 is connected in series with a first loading intermediate relay KA1 for controlling the on / off state of loading solenoid valve Y1.

6. The electrical control system for the hydraulic station for opening and closing holes in a submerged arc furnace according to claim 5, characterized in that, The control circuit of the No. 1 loading solenoid valve Y1 includes: The fifth spring switch SB5 is connected at one end to the phase line output terminal of the main control switch K3; The sixth spring switch SB6 is connected in series with the end of the fifth spring switch SB5 that is furthest from the main control switch K3; First loading coil KA1 线圈 The first loading coil KA1 is connected in series at the end of the sixth spring switch SB6 furthest from the fifth spring switch SB5. 线圈 The end of the switch away from the sixth spring switch SB6 is electrically connected to the neutral wire N; First intermediate relay normally open contact KA1 常 It is connected in parallel to both ends of the sixth spring switch SB6, and passes through the first loading coil KA1. 线圈 After being energized, it controls the normally open contact KA1 of the first intermediate relay. 常 Closed, for starting the No. 1 loading solenoid valve Y1; The first loading indicator light HR3 is connected in parallel to the sixth spring switch SB6 and the first loading coil KA1. 线圈 On the circuit.

7. The electrical control system for the hydraulic station for opening and closing holes in a submerged arc furnace according to claim 2, characterized in that, The second execution control unit includes: The second main contact switch KM2 is connected in series at the end of the second sub-control switch K2 that is away from the main control switch K3, and is used to switch the power supply on and off for the No. 2 oil pump. The second thermal relay RJ2 is connected in series at the end of the second main contact switch KM2 away from the second sub-control switch K2, and is used for mechanical protection against overload and phase loss of the No. 2 oil pump; The second motor integrated protector ZB2 is connected in series with the second thermal relay RJ2 and the second starting coil KM2. 线圈 Electronic protection for the No. 2 oil pump in the circuit, including protection against stall, underload, three-phase imbalance and start-up timeout.

8. The electrical control system for the hydraulic station for opening and closing holes in a submerged arc furnace according to claim 7, characterized in that, The second main contact switch KM2 includes: The third spring switch SB3 is connected in series at the end of the second sub-control switch K2 that is furthest from the main control switch K3; The fourth spring switch SB4 is connected in series between the circuit of the third spring switch SB3 and the circuit of the second thermal relay RJ2; Second normally open contact switch KM2 常 It is connected in parallel between the circuit of the third spring switch SB3 and the second thermal relay RJ2, and passes through the second starting coil KM2. 线圈 After being powered on, it controls the second normally open contact switch KM2. 常 Close the switch to start oil pump number 2.

9. The electrical control system for the hydraulic station for opening and closing holes in a submerged arc furnace according to claim 5, characterized in that, The control circuit of the No. 2 loading solenoid valve Y2 is connected in series with a second loading intermediate relay KA2, which is used to control the on and off of the No. 2 loading solenoid valve Y2.

10. The electrical control system for the hydraulic station for opening and closing holes in a submerged arc furnace according to claim 9, characterized in that, The control circuit of the No. 2 loading solenoid valve Y2 includes: The seventh spring switch SB7 is connected at one end to the phase line output terminal of the main control switch K3; The eighth spring switch SB8 is connected in series with the end of the seventh spring switch SB7 that is furthest from the main control switch K3; Second loading coil KA2 线圈 The second loading coil KA2 is connected in series at the end of the eighth spring switch SB8 furthest from the seventh spring switch SB7. 线圈 The end of the eighth spring switch SB8 that is furthest from the ground wire N is electrically connected; Second intermediate relay normally open contact KA2 常 It is connected in parallel to both ends of the eighth spring switch SB8, and passes through the second loading coil KA2. 线圈 After being energized, it controls the normally open contact KA2 of the second intermediate relay. 常 Closed, for starting the No. 2 loading solenoid valve Y2; The second loading indicator light HR4 is connected in parallel to the eighth spring switch SB8 and the second loading coil KA2. 线圈 On the circuit.

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