RH furnace hot well pump emergency starting system and control method

Abstract

The invention relates to the technical field of smelting, in particular to an RH furnace hot well pump emergency starting system and a control method.The emergency starting system comprises a first water pump motor, a second water pump motor, a starting device and a third water pump motor, and a first power supply and a second power supply for respectively supplying power to the 1 # water pump motor and the 2 # water pump motor are arranged in parallel. A change-over switch SA1 or SA2 on the operation box is correspondingly switched to an in-situ mode, and a starting switch SB1 or a starting switch SB3 is correspondingly pressed at the same time, so that a 1 # water pump motor and a 2 # water pump motor can be separated from an original control system and can be quickly started directly through an emergency starting system, water in a hot water well tank can be quickly pumped back into a water treatment pool, and the water treatment efficiency is improved. Water in the hot water well tank is prevented from overflowing, and certain potential safety hazards are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of smelting, and in particular to an emergency starting system and a control method for a hot water well pump of an RH furnace. Background Art

[0002] The RH furnace in the converter steel plant is mainly used to smelt high-quality steel. At present, during the smelting process of the RH furnace, the turbid ring water produced by smelting will flow into the hot water well tank. Subsequently, the water in the hot water well tank is pumped back to the water treatment turbid ring water tank through three water pumps (two for use and one for backup).

[0003] At present, the three hot water well pumps are controlled by the operator on the operation screen, and the water pumps are controlled by PLC according to the height of the hot water well liquid level. Although the three water pump motors are connected to different two-way power supplies respectively, the control part is shared. When there is a control power failure, PLC communication failure, PLC freeze, output module and other failures, the three hot water well pumps cannot be started quickly in a short time, and the water in the hot water well tank cannot be pumped back to the water treatment pool. In just two to three minutes, the water in the hot water well tank is full and overflows into the RH furnace pit and surrounding areas. In addition, there is a serious safety hazard due to the accumulation of water in the molten steel smelting area. Therefore, on the one hand, the RH furnace must stop smelting immediately and deal with the accumulated water before production. On the other hand, the smelting ladle must be lifted away during emergency disposal, and there are also safety hazards during the lifting process. Summary of the invention

[0004] The present invention provides an emergency starting system and control method for a hot water well pump of an RH furnace to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: An emergency starting system and control method for a hot water well pump of an RH furnace, comprising a 1# water pump motor and a 2# water pump motor powered by a first power supply and a second power supply respectively, a starting device electrically connected to the second power supply respectively, and a 3# water pump motor powered by the first power supply, wherein the first power supply and the second power supply respectively powering the 1# water pump motor and the 2# water pump motor are arranged in parallel, and the starting device comprises an electrical control box installed in an electrical room and an operating box installed in a main control room, and an operating panel of the operating box is provided with a switching switch SA1, a push button switch SB1 and a push button switch SB2 for controlling the 1# water pump motor, and a switching switch SA2, a push button switch SB3 and a push button switch SB4 for controlling the 2# water pump motor, the switching switches SA1 and SA2 act on a "remote / local" mode respectively, and when the switching switches SA1 and SA2 are in the remote mode, the 1# water pump motor and the 2# water pump motor are powered by a circuit of the first power supply, and when the switching switches SA1 and SA2 are in the local mode, the 1# water pump motor and the 2# water pump motor are powered by a circuit of the second power supply.

[0006] Preferably, the RH furnace hot water well pump emergency start system and control method further include a float type liquid level gauge arranged in the hot water well tank for monitoring the water level and an alarm device arranged in the main control room for alarming the water level monitoring status; The alarm device is used to give an alarm when the data of the water level monitored by the float type liquid level gauge is too high.

[0007] Preferably, the alarm device is an alarm light.

[0008] Preferably, the alarm device is a buzzer.

[0009] Preferably, a PLC programmable controller is provided in the main control room, and the PLC programmable controller adopts a PLC-touch screen as the system processing end.

[0010] Preferably, the circuit of the first power supply of the 1# water pump motor is provided with contactors K1 and K3 for suction switching, and the circuit of the first power supply of the 2# water pump motor is provided with contactors K5 and K7 for suction switching. The contactors K1 and K5 are suctioned and switched by manipulating the corresponding switching switches SA1 and SA2, and the contactors K3 and K7 are both controlled by a PLC programmable controller for suction switching.

[0011] Preferably, the circuit of the second power supply of the 1# water pump motor is provided with a contactor K2 and a contactor K4 for suction switching, and the circuit of the second power supply of the 2# water pump motor is provided with a contactor K6 and a contactor K8 for suction switching. The contactors K2 and K6 are suctioned and switched by operating the corresponding switching switches SA1 and SA2, and the contactors K4 and K8 are suctioned and switched by operating the corresponding button switches SB1 and SB3.

[0012] Preferably, the button switch SB1 and the button switch SB3 are both start switches, and the button switch SB2 and the button switch SB4 are both stop switches.

[0013] The technical solution of the present application also provides a control method for an emergency starting system of a RH furnace hot water well pump, comprising the following steps: Step S100, during normal operation, the switches SA1 and SA2 are switched to the remote mode respectively, and at the same time, the PLC remote controller is controlled so that the 1# water pump motor and the 2# water pump motor are both powered by the first power supply; Step S200, when the power supply of the 1# water pump motor fails, according to the prompt of the alarm device, the switch SA1 is turned on the local mode, and at the same time, according to the operation of the button switch SB1, the 1# water pump motor is powered by the second power supply; Step S300, when the power supply of the 2# water pump motor fails, according to the prompt of the alarm device, the switch SA2 is turned on the local mode, and at the same time, according to the operation of the button switch SB3, the 2# water pump motor is powered by the second power supply; Step S400, when the power supply of both the 1# water pump motor and the 2# water pump motor fails, according to the prompt of the alarm device, the switching switch SA1 and the switching switch SA2 are respectively turned to the local mode, and at the same time, according to the operation of the button switch SB1 and the button switch SB3, the 1# water pump motor and the 2# water pump motor are both powered by the second power supply.

[0014] Preferably, in step S200, step S300 and step S400, the specific steps of the alarm device prompting are: monitor the water level according to the float level gauge in the hot water well tank, and when the monitored water level is too high, transmit the monitoring data to the alarm device, and issue an alarm prompt after the alarm device receives the data.

[0015] By adopting the above technical solution, the beneficial effects achieved by the present invention are: In the present invention, by adding an emergency starting device for the hot water well pump of the RH furnace, when the control power supply has a PLC communication failure, a PLC freeze, an output module failure, etc., the switching switch SA1 or the switching switch SA2 on the operation box can be correspondingly switched to the local mode, and the starting switch SB1 or the starting switch SB3 can be pressed correspondingly at the same time, so that the 1# water pump motor and the 2# water pump motor can be separated from the original control system and quickly started directly through the emergency starting system, thereby ensuring that the water in the hot water well tank is quickly pumped back to the water treatment pool, preventing the water in the hot water well tank from overflowing, and reducing certain safety hazards.

[0016] In the present invention, a set of float type liquid level gauge is added to the hot water well tank, and an alarm device is installed in the main control room at the same time, so that when the water level monitored by the float type liquid level gauge is too high, the alarm device installed in the main control room can give an alarm, reminding the staff to quickly start the emergency start device to prevent the water in the hot water well tank from overflowing, ensure normal production, and effectively eliminate safety hazards.

[0017] In summary, the present invention realizes that when the PLC controller is in a fault state, the hot water well pump can be quickly started through the emergency starting device through reasonable electrical schematic design, component selection, installation, wiring and debugging. At the same time, a set of float type liquid level gauge and alarm device are used to effectively prevent the water in the hot water well tank from overflowing, avoiding a series of safety hazards caused by the water overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A circuit diagram of a first power supply and a second power supply connected in parallel according to an embodiment of the present invention; Figure 2 This is a circuit diagram of the first power supply control part of an embodiment of the present invention; Figure 3 A circuit diagram of a second power supply control part according to an embodiment of the present invention; Figure 4 Schematic diagram of the operation panel of the operation box according to the embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure. Example

[0021] like Figure 1-4 As shown, the present invention provides an emergency starting system and control method for a hot water well pump of an RH furnace, comprising a 1# water pump motor and a 2# water pump motor powered by a first power supply and a second power supply respectively, a starting device electrically connected to the second power supply respectively, and a 3# water pump motor powered by the first power supply. Two water pumps can be used for emergency use for water in the hot water well tank. Therefore, in order to reduce costs, an emergency starting system may not be used for the 3# water pump motor. However, it should be noted that, based on cost considerations, this solution only adds emergency starting systems for two water pumps. However, if in actual use, without considering costs, all three water pumps can be used for emergency use, thereby achieving better results when used. The first power supplies respectively powered on the 1# water pump motor and the 2# water pump motor The first power supply is arranged in parallel with the second power supply, and the starting device includes an electrical control box installed in the electrical room and an operation box installed in the main control room. The operation panel of the operation box is provided with a switching switch SA1, a button switch SB1 and a button switch SB2 for controlling the 1# water pump motor, and a switching switch SA2, a button switch SB3 and a button switch SB4 for controlling the 2# water pump motor. The switching switches SA1 and SA2 act on the "remote / local" mode respectively, and when the switching switches SA1 and SA2 are in the remote mode, the 1# water pump motor and the 2# water pump motor are powered by the circuit of the first power supply, and when the switching switches SA1 and SA2 are in the local mode, the 1# water pump motor and the 2# water pump motor are powered by the circuit of the second power supply.

[0022] As a further feature, the RH furnace hot water well pump emergency start-up system and control method also include a float-type liquid level gauge disposed in the hot water well tank for monitoring the water level and an alarm device disposed in the main control room for alarming the water level monitoring status; The alarm device is used to give an alarm when the data of the water level monitored by the float type liquid level gauge is too high.

[0023] Furthermore, the alarm device is an alarm light. When the float-type liquid level gauge monitors that the water level is too high, the alarm light in the main control room can light up to remind the staff to quickly handle the emergency start-up system to avoid water overflow and effectively eliminate safety hazards.

[0024] Furthermore, the alarm device is a buzzer. When the float-type liquid level gauge detects that the water level is too high, the buzzer in the main control room will sound to remind the staff to quickly start the emergency system to prevent the water in the hot water well tank from overflowing, reduce certain safety hazards, and ensure normal production.

[0025] It should be emphasized that the alarm device in this scheme includes but is not limited to alarm lights and buzzers, and alarm speakers can also be used for broadcasting. At the same time, when the alarm device is installed and used, the alarm light and buzzer can be installed together in the main control room to ensure that the double reminder is more reliable, prompting the staff to operate the emergency start system, so that the water level in the hot water well tank can be lowered to reduce safety hazards.

[0026] As a further step, a PLC programmable controller is installed in the main control room, and the PLC programmable controller adopts a PLC-touch screen as the system processing end.

[0027] Furthermore, the circuit of the first power supply of the 1# water pump motor is provided with contactors K1 and K3 for suction switching, and the circuit of the first power supply of the 2# water pump motor is provided with contactors K5 and K7 for suction switching. Contactors K1 and K5 are suctioned and switched by manipulating corresponding switching switches SA1 and SA2, and contactors K3 and K7 are both suctioned and switched by controlling a PLC programmable controller.

[0028] Furthermore, the circuit of the second power supply of the 1# water pump motor is provided with contactors K2 and K4 for suction switching, and the circuit of the second power supply of the 2# water pump motor is provided with contactors K6 and K8 for suction switching. Contactors K2 and K6 are suctioned and switched by operating the corresponding switching switches SA1 and SA2, and contactors K4 and K8 are suctioned and switched by operating the corresponding button switches SB1 and SB3.

[0029] As a further feature, the button switch SB1 and the button switch SB3 are both start switches, and the button switch SB2 and the button switch SB4 are both stop switches.

[0030] Specifically, the button switch SB1 can control the contactor K4 on the second power supply circuit to be attracted and energized, while the button switch SB3 can control the contactor K8 on the second power supply circuit to be attracted and energized, and the button switch SB2 can control the contactor K4 on the second power supply circuit to be disconnected, and the button switch SB4 can control the contactor K8 on the second power supply circuit to be disconnected.

[0031] like Figure 1-4 As shown, the present invention also provides a control method for an emergency starting system of a RH furnace hot water well pump, comprising the following steps: Step S100, during normal operation, the switches SA1 and SA2 are switched to the remote mode respectively, and at the same time, the PLC remote controller is controlled so that the 1# water pump motor and the 2# water pump motor are both powered by the first power supply; Among them, the switching switches SA1 and SA2 are respectively turned on the remote mode, and then the contactors K1 and K5 corresponding to the 1# water pump motor and the 2# water pump motor on the first power supply circuit are energized. At the same time, the staff controls the contactors K3 and K7 to be energized through the PLC remote controller, so that the 1# water pump motor and the 2# water pump motor are powered by the first power supply. During this period, the contactor K9 on the first power supply circuit supplied to the 3# water pump motor can be energized, so that the three water pumps can pump the turbid water back to the turbid water pool of the water treatment. It should be emphasized that the three water pumps are two for use and one for backup, so the emergency start system is not processed for the 3# water pump motor; Step S200, when the power supply of the 1# water pump motor fails, according to the prompt of the alarm device, the switch SA1 is turned on the local mode, and at the same time, according to the operation of the button switch SB1, the 1# water pump motor is powered by the second power supply; Step S300, when the power supply of the 2# water pump motor fails, according to the prompt of the alarm device, the switch SA2 is turned on the local mode, and at the same time, according to the operation of the button switch SB3, the 2# water pump motor is powered by the second power supply; S400, when the power supply of both the 1# water pump motor and the 2# water pump motor fails, according to the prompt of the alarm device, the switching switch SA1 and the switching switch SA2 are respectively turned to the local mode, and at the same time, according to the operation of the button switch SB1 and the button switch SB3, the 1# water pump motor and the 2# water pump motor are powered by the second power supply.

[0032] As a further step, in step S200, step S300 and step S400, the specific steps of the alarm device's prompt are: monitor the water level according to the float level gauge in the hot water well tank, and when the monitored water level is too high, transmit the monitoring data to the alarm device, and issue an alarm prompt after the alarm device receives the data.

[0033] The working principle and use process of the present invention: When the first power supply fails or the control circuit, PLC system, etc. fail, the staff switches the switch SA1 or the switch SA2 on the operation box so that the switch SA1 or the switch SA2 can be switched to the local mode, and then the contactor K1 corresponding to the 1# water pump motor on the first power circuit is disconnected or the contactor K5 corresponding to the 2# water pump motor on the first power circuit is disconnected, and synchronously, the contactor K2 corresponding to the 1# water pump motor on the second power circuit is energized or the contactor K6 of the 2# water pump motor on the second power circuit is energized, and then, when the button switch SB1 is manually pressed, the contactor K4 can be energized, and when the button switch SB3 is pressed, the contactor K8 can be energized, so that the 1# water pump motor and the 2# water pump motor are separated from the original control system and can be quickly started directly through the emergency start system, thereby ensuring that the water in the hot water well tank is quickly pumped back to the water treatment pool, preventing the water in the hot water well tank from overflowing, and reducing certain safety hazards.

[0034] Furthermore, in order to avoid the problem that the staff does not discover the high water level in the first time after a failure occurs, resulting in the failure to activate the emergency start-up system in time, a set of float-type liquid level gauges can be added to the hot water well tank, and an alarm device can be installed in the main control room at the same time. When the float-type liquid level gauge monitors that the water level is too high, the alarm device installed in the main control room can issue an alarm, reminding the staff to deal with it quickly, reduce the occurrence of accidents, ensure normal production, and eliminate safety hazards.

[0035] It should be noted that the staff operates the stop switch SB2 or the stop switch SB4 to stop the corresponding 1# water pump motor or 2# water pump motor. In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An emergency starting system for a RH furnace hot water well pump, characterized in that: The invention comprises a 1# water pump motor and a 2# water pump motor respectively powered by a first power supply and a second power supply, a starting device respectively electrically connected to the second power supply, and a 3# water pump motor powered by the first power supply, wherein the first power supply respectively powered by the 1# water pump motor and the 2# water pump motor is arranged in parallel with the second power supply, and the starting device comprises an electrical control box installed in an electrical room and an operation box installed in a main control room, and an operation panel of the operation box is provided with a switching switch SA1, a button switch SB1 and a button switch SB2 for controlling the 1# water pump motor, and a switching switch SA2, a button switch SB3 and a button switch SB4 for controlling the 2# water pump motor, the switching switches SA1 and SA2 act on a "remote / local" mode respectively, and when the switching switches SA1 and SA2 are in the remote mode, the 1# water pump motor and the 2# water pump motor are powered by the circuit of the first power supply, and when the switching switches SA1 and SA2 are in the local mode, the 1# water pump motor and the 2# water pump motor are powered by the circuit of the second power supply.

2. The RH furnace hot water well pump emergency starting system according to claim 1, characterized in that: It also includes a float type liquid level gauge arranged in the hot water well tank for monitoring the water level and an alarm device arranged in the main control room for alarming the water level monitoring status; The alarm device is used to give an alarm when the data of the water level monitored by the float type liquid level gauge is too high.

3. The RH furnace hot water well pump emergency starting system according to claim 2, characterized in that: The alarm device is an alarm light.

4. The RH furnace hot water well pump emergency starting system according to claim 2, characterized in that: The alarm device is a buzzer.

5. The RH furnace hot water well pump emergency starting system according to claim 1, characterized in that: The main control room is provided with a PLC programmable controller, and the PLC programmable controller adopts a PLC-touch screen as the system processing end.

6. The RH furnace hot water well pump emergency starting system according to claim 5, characterized in that: The circuit of the first power supply of the 1# water pump motor is provided with contactors K1 and K3 for suction switching, and the circuit of the first power supply of the 2# water pump motor is provided with contactors K5 and K7 for suction switching. The contactors K1 and K5 are suctioned and switched by manipulating the corresponding switching switches SA1 and SA2, and the contactors K3 and K7 are both controlled by the PLC programmable controller for suction switching.

7. The RH furnace hot water well pump emergency starting system according to claim 1, characterized in that: The circuit of the second power supply of the 1# water pump motor is provided with contactors K2 and K4 for suction switching, and the circuit of the second power supply of the 2# water pump motor is provided with contactors K6 and K8 for suction switching. The contactors K2 and K6 are suctioned and switched by operating the corresponding switching switches SA1 and SA2, and the contactors K4 and K8 are suctioned and switched by operating the corresponding button switches SB1 and SB3.

8. The RH furnace hot water well pump emergency starting system according to claim 1, characterized in that: The button switch SB1 and the button switch SB3 are both start switches, and the button switch SB2 and the button switch SB4 are both stop switches.

9. A control method for an emergency starting system of a RH furnace hot water well pump as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Step S100, during normal operation, the switches SA1 and SA2 are switched to the remote mode respectively, and at the same time, the PLC remote controller is controlled so that the 1# water pump motor and the 2# water pump motor are both powered by the first power supply; Step S200, when the power supply of the 1# water pump motor fails, according to the prompt of the alarm device, the switch SA1 is turned on the local mode, and at the same time, according to the operation of the button switch SB1, the 1# water pump motor is powered by the second power supply; Step S300, when the power supply of the 2# water pump motor fails, according to the prompt of the alarm device, the switch SA2 is turned on the local mode, and at the same time, according to the operation of the button switch SB3, the 2# water pump motor is powered by the second power supply; Step S400, when the power supply of both the 1# water pump motor and the 2# water pump motor fails, according to the prompt of the alarm device, the switching switch SA1 and the switching switch SA2 are respectively turned to the local mode, and at the same time, according to the operation of the button switch SB1 and the button switch SB3, the 1# water pump motor and the 2# water pump motor are both powered by the second power supply.

10. The control method according to claim 9, characterized in that: In step S200, step S300 and step S400, the specific steps of the alarm device prompting are: monitor the water level according to the float level gauge in the hot water well tank, and when the monitored water level is too high, transmit the monitoring data to the alarm device, and issue an alarm prompt after the alarm device receives the data.

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