A method and apparatus for cold rolling electrical device controls

Abstract

This application provides a control method and apparatus for electrical equipment in cold rolling mills. The method is applied to pickling mills and / or push-pull pickling mills. Each mill includes at least one equipment group, and each equipment group includes at least two drive devices driven by frequency converters. Multiple frequency converters within the same equipment group operate in a master-slave control mode. When the master drive device in any equipment group fails, the controller sends a stop command to the frequency converter of the failed device according to a one-key forced command, and designates a new master drive device from all slave drive devices. The remaining slave drive devices follow the new master drive device. When a slave drive device in any equipment group fails, the controller sends a stop command to the frequency converter of the failed device according to a one-key forced command; the master drive devices within the same equipment group maintain master mode operation, and the remaining unfailed slave drive devices follow the master drive device, thereby preventing prolonged downtime due to partial equipment failure.

Description

Technical Field

[0001] This application relates to the field of cold rolling technology for strip steel, and more specifically, to a method and apparatus for controlling electrical equipment used in cold rolling. Background Technology

[0002] In the cold rolling production process, the pickling and rolling mill and the push-pull pickling mill are key production equipment, and the stable operation of their transmission equipment directly affects production efficiency and product quality.

[0003] The raw material thickness of the pickling and rolling mill is 2.0–6.0 mm. The mill is equipped with multiple sets of tension roll drives and multiple sets of looper drives, all consisting of motors, gearboxes, and couplings. Due to the thickness of the raw material, the mill operates at speeds up to 450 m / min. The motors, gearboxes, and couplings of the tension rolls and loopers are subjected to high-load impacts from frequent acceleration and deceleration over a long period, making them prone to damage. Once the motors, gearboxes, or other equipment of the tension rolls or loopers fail, troubleshooting typically takes more than 10 hours, resulting in a major downtime.

[0004] The push-pull pickling unit is equipped with an outlet double pinch roll system, consisting of four pinch rolls used to pinch the strip during threading and tailing. Because each pinch roll uses an independent speed control mode, arching is prone to occur during strip threading and tailing in actual operation. The arched strip is susceptible to collision with the outlet slitting shear, resulting in surface abrasions. Furthermore, malfunctions in the pinch roll motor, gearbox, or coupling can also lead to prolonged unit downtime.

[0005] In summary, how to effectively prevent prolonged shutdown of cold rolling mills when electrical equipment malfunctions is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this application is to provide a method and apparatus for controlling cold rolling electrical equipment, so as to effectively avoid long-term shutdown of the unit when the cold rolling electrical equipment fails.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows: On one hand, this application provides a method for controlling electrical equipment in cold rolling mills, applied to pickling mills and / or push-pull pickling mills, wherein the mills include at least one equipment group, which is any one of a tension roll group, a looper, or an exit double pinch roll; each equipment group includes at least two transmission devices driven by independent frequency converters, and multiple frequency converters within the same equipment group operate in a master-slave control mode; the method includes: When the main drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed main drive device according to the received one-key forced command, and sends a forced switching command to all slave drive devices in the same equipment group to designate a new main drive device from all slave drive devices, switch its inverter from slave mode to master mode, and the remaining slave drive devices follow the new main drive device to run. When a slave drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed slave drive device according to the received one-key forced command; the master drive device in the same equipment group continues to operate in master mode, and the remaining unfailed slave drive devices follow the master drive device.

[0008] Furthermore, the method is applied to a pickling and rolling mill, which includes multiple tension roll groups. Each tension roll group includes a No. 1 roll driven by a No. 1 frequency converter and a No. 2 roll driven by a No. 2 frequency converter. Under normal circumstances, the No. 1 frequency converter of the tension roll group operates in master mode, and the No. 2 frequency converter of the tension roll group operates in slave mode. The step of the controller sending a stop operation command to the frequency converter of the faulty main drive equipment according to the received one-key forced command, and sending a forced switching command to all slave drive equipment in the same equipment group when the main drive equipment in any equipment group fails includes: When the No. 1 roller in any tension roller group fails, the tension roller group is taken as the tension roller group to be controlled, and the forced command of the No. 1 frequency converter of the tension roller group to be controlled is input through the human-machine interface. When the controller receives a valid forced command from the No. 1 frequency converter of the tension roll group to be controlled, the controller sends a stop operation command to the No. 1 frequency converter of the tension roll group to be controlled, sends a forced switching command for the No. 1 frequency converter to the No. 2 frequency converter of the tension roll group to be controlled, and sends a signal simulating the operation of the No. 1 frequency converter of the tension roll group to the pickling mill interlock control program. When the No. 2 frequency converter of the tension roll group to be controlled receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by its own speed loop; under the control of its own speed loop and torque loop, the No. 2 frequency converter of the tension roll group to be controlled runs at the set speed of the pickling mill.

[0009] Furthermore, the step of the controller sending a stop operation command to the inverter of the faulty slave drive device according to the received one-key forced operation command when any slave drive device in the equipment group fails includes: When the No. 2 roller in any tension roller group fails, the tension roller group is taken as the tension roller group to be controlled, and the forced command of the No. 2 frequency converter of the tension roller group to be controlled is input through the human-machine interface. When the controller receives a valid forced command from the No. 2 frequency converter of the tension roll group to be controlled, the controller sends a stop operation command to the No. 2 frequency converter of the tension roll group to be controlled and sends a signal simulating the operation of the No. 2 frequency converter of the tension roll group to the interlocking control program of the pickling mill. The No. 1 frequency converter of the tension roll group to be controlled operates at the set speed of the pickling mill under the control of its own speed loop and torque loop.

[0010] Furthermore, the method is applied to a pickling and rolling mill unit, which includes multiple loopers. Each looper includes a No. 1 rope pulley driven by looper No. 1 frequency converter, a No. 2 rope pulley driven by looper No. 2 frequency converter, and a No. 3 rope pulley driven by looper No. 3 frequency converter. Under normal circumstances, looper No. 1 frequency converter operates in master mode, while looper No. 2 and looper No. 3 frequency converters operate in slave mode. The step of the controller sending a stop operation command to the frequency converter of the faulty master drive equipment and sending a forced switching command to all slave drive equipment in the same equipment group when the master drive equipment in any equipment group fails includes: When the No. 1 pulley in any loop fails, the loop is designated as the loop to be controlled, and a forced command for the No. 1 frequency converter of the loop to be controlled is input through the human-machine interface. When the controller receives a valid forced command for the No. 1 frequency converter of the looper to be controlled, the controller sends a stop operation command to the No. 1 frequency converter of the looper to be controlled, sends a forced switching command for the No. 1 frequency converter to the No. 2 and No. 3 frequency converters of the looper to be controlled, and sends a signal simulating the operation of the No. 1 frequency converter of the looper to be controlled to the pickling mill interlock control program. When the No. 2 variable frequency drive of the control loop receives the forced switching command of the No. 1 variable frequency drive, its torque loop setting value is switched to the torque component output by its own speed loop; the No. 2 variable frequency drive of the control loop operates at the set speed of the pickling and rolling mill under the control of its own speed loop and torque loop. When the No. 3 frequency converter of the control loop receives the forced switching command of the No. 1 frequency converter, its torque loop setpoint is switched to the torque component output by the speed loop of the No. 2 frequency converter of the control loop; the No. 3 frequency converter of the control loop operates under the control of its own torque loop and the speed loop of the No. 2 frequency converter of the control loop.

[0011] Furthermore, the step of the controller sending a stop operation command to the inverter of the faulty slave drive device according to the received one-key forced operation command when any slave drive device in the equipment group fails includes: When the No. 2 pulley in any looper fails, the looper is designated as the looper to be controlled, and the forced command of the No. 2 frequency converter of the looper to be controlled is input through the human-machine interface. When the controller receives a valid forced command for the No. 2 frequency converter to be controlled, the controller sends a stop operation command to the No. 2 frequency converter to be controlled and sends a signal simulating the operation of the No. 2 frequency converter to the pickling mill interlock control program. The No. 1 variable frequency drive of the control looper operates at the set speed of the pickling and rolling mill under the control of its own speed loop and torque loop. When the No. 3 frequency converter of the control loop does not receive a forced switching command from the No. 1 frequency converter, its torque loop setting value remains the torque component output by the speed loop of the No. 1 frequency converter of the control loop; the No. 3 frequency converter of the control loop operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter of the control loop.

[0012] Furthermore, the step of the controller sending a stop operation command to the inverter of the faulty slave drive device according to the received one-key forced operation command when any slave drive device in the equipment group fails includes: When the No. 3 pulley in any looper fails, the looper is designated as the looper to be controlled, and the forced command of the No. 3 frequency converter of the looper to be controlled is input through the human-machine interface. When the controller receives a valid forced command for the No. 3 frequency converter of the looper to be controlled, the controller sends a stop operation command to the No. 3 frequency converter of the looper to be controlled and sends a signal simulating the operation of the No. 3 frequency converter of the looper to be controlled to the interlocking control program of the pickling mill. The No. 1 variable frequency drive of the control looper operates at the set speed of the pickling and rolling mill under the control of its own speed loop and torque loop. When the No. 2 switch frequency converter does not receive a forced switching command from the No. 1 switch frequency converter, its torque loop setting value remains the torque component output by the speed loop of the No. 1 switch frequency converter; the No. 2 switch frequency converter operates under the control of its own torque loop and the speed loop of the No. 1 switch frequency converter.

[0013] Furthermore, the method is applied to a push-pull pickling unit, which includes an outlet double pinch roller. The outlet double pinch roller includes a No. 1 pinch roller driven by an outlet double pinch roller frequency converter 1, a No. 2 pinch roller driven by an outlet double pinch roller frequency converter 2, a No. 3 pinch roller driven by an outlet double pinch roller frequency converter 3, and a No. 4 pinch roller driven by an outlet double pinch roller frequency converter 4; wherein, pinch rollers 1 and 2 are both lower rollers, and pinch rollers 3 and 4 are both upper rollers; in the No. 3 pinch roller… With the No. 1 and No. 4 pinch rolls in the depressed state and all pinch rolls functioning normally, the No. 1 frequency converter of the exit double pinch roll operates in master mode, while the No. 2, No. 3, and No. 4 frequency converters of the exit double pinch rolls all operate in slave mode. The steps for the controller to send a stop command to the frequency converter of the faulty main drive equipment and a forced switching command to all slave drive equipment within the same equipment group when the main drive equipment in any equipment group fails include: When pinch rollers No. 3 and No. 4 are in the pressed state and pinch roller No. 1 is faulty, input the forced command of the No. 1 frequency converter of the double pinch roller at the outlet through the human-machine interface. When the controller receives a valid forced command for the No. 1 frequency converter of the double pinch roller at the outlet, the controller sends a stop operation command to the No. 1 frequency converter of the double pinch roller at the outlet, sends a forced switching command for the No. 1 frequency converter to the No. 2, No. 3 and No. 4 frequency converters of the double pinch roller at the outlet, and sends a signal simulating the operation of the No. 1 frequency converter of the double pinch roller at the outlet to the interlock control program of the push-pull pickling unit. When the No. 2 frequency converter of the outlet double pinch roller receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by its own speed loop; under the control of its own speed loop and torque loop, the No. 2 frequency converter of the outlet double pinch roller runs at the set speed of the push-pull pickling unit. When the No. 3 frequency converter of the exit double pinch roll receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by the speed loop of the No. 2 frequency converter of the exit double pinch roll; the No. 3 frequency converter of the exit double pinch roll operates under the control of its own torque loop and the speed loop of the No. 2 frequency converter of the exit double pinch roll. When the No. 4 frequency converter of the exit double pinch roll receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by the speed loop of the No. 2 frequency converter of the exit double pinch roll; the No. 4 frequency converter of the exit double pinch roll operates under the control of its own torque loop and the speed loop of the No. 2 frequency converter of the exit double pinch roll.

[0014] Furthermore, the step of the controller sending a stop operation command to the inverter of the faulty slave drive device according to the received one-key forced operation command when any slave drive device in the equipment group fails includes: When pinch rollers No. 3 and No. 4 are in the pressed state and pinch roller No. 2 is faulty, input the forced command of the No. 2 frequency converter of the double pinch roller at the outlet through the human-machine interface. When the controller receives a valid forced command for the No. 2 frequency converter of the double pinch roller at the outlet, the controller sends a stop operation command to the No. 2 frequency converter of the double pinch roller at the outlet and sends a signal simulating the operation of the No. 2 frequency converter of the double pinch roller at the outlet to the interlock control program of the push-pull pickling unit. The No. 1 frequency converter of the double pinch roller at the outlet operates at the set speed of the push-pull pickling unit under the control of its own speed loop and torque loop. When the No. 3 frequency converter of the exit double pinch roller does not receive the forced switching command of the No. 1 frequency converter, the set value of its torque loop remains the torque component output by the speed loop of the No. 1 frequency converter of the exit double pinch roller; the No. 3 frequency converter of the exit double pinch roller operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter of the exit double pinch roller. When the No. 4 frequency converter of the exit double pinch roller does not receive the forced switching command of the No. 1 frequency converter, its torque loop setting value remains the torque component output by the speed loop of the No. 1 frequency converter of the exit double pinch roller; the No. 4 frequency converter of the exit double pinch roller operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter of the exit double pinch roller.

[0015] Furthermore, the transmission device comprises a motor, a gearbox, a coupling, and a frequency converter; the method further includes: When any one of the components in the transmission equipment—motor, gearbox, coupling, or frequency converter—fails, the transmission equipment is deemed to have malfunctioned.

[0016] On the other hand, this application also provides a cold rolling electrical equipment control device, which is applied to a pickling mill and / or a push-pull pickling mill. The mill includes at least one equipment group, which is any one of a tension roll group, a looper, or an exit double pinch roll. Each equipment group includes at least two transmission devices driven by independent frequency converters, and multiple frequency converters within the same equipment group operate in a master-slave control mode. The device is used to execute the cold rolling electrical equipment control method as described in any of the foregoing embodiments, and the device includes: The first control module is used to send a stop operation command to the inverter of the faulty main drive equipment according to the received one-key forced command when the main drive equipment in any equipment group fails, and to send a forced switching command to all slave drive equipment in the same equipment group, so as to designate a new main drive equipment from all slave drive equipment, switch its inverter from slave mode to master mode, and the remaining slave drive equipment follow the new main drive equipment to run. The second control module is used to send a stop operation command to the inverter of the faulty slave drive device according to the received one-key forced command in the event of a failure of the slave drive device in any equipment group; the master drive device in the same equipment group continues to operate in master mode, and the remaining unfaulty slave drive devices follow the master drive device.

[0017] Compared with the prior art, this application has the following advantages: The cold rolling electrical equipment control method provided in this application adopts a master-slave control mode for multiple drive devices in the same equipment group (such as tension roll group, looper, or exit double pinch roll), changing the logic of independent control of a single drive device in traditional methods. This effectively prevents quality problems such as strip arching and scratches caused by asynchronous speeds of multiple drive devices. Furthermore, when a fault occurs in the master or slave drive device in the same equipment group, a single-key forced command is triggered, and the controller automatically isolates the faulty device and reassembles the master-slave control logic of the remaining normal devices, ensuring that all online devices continue to operate collaboratively. The entire process eliminates the need for downtime to wait for the disassembly, replacement, and complex debugging of the faulty device. The pickling mill and / or push-pull pickling mill can shield the faulty device from continued operation, improving production efficiency and product quality. Attached Figure Description

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] Figure 1 A flowchart illustrating a control method for cold-rolling electrical equipment provided in this application; Figure 2 This is one of the flowcharts for controlling the tension roll equipment of a pickling mill provided in this application; Figure 3 A second schematic diagram of a process for controlling the tension roll equipment of a pickling mill provided in this application; Figure 4 This application provides one of the electrical logic diagrams for controlling the tension roll equipment of a pickling mill. Figure 5 The second electrical logic diagram provided in this application for controlling the tension roll equipment of a pickling mill; Figure 6 One of the flowcharts provided in this application illustrates the control of the looper equipment of a pickling and rolling mill. Figure 7 A second schematic diagram of a process for controlling the looper equipment of a pickling and rolling mill provided in this application; Figure 8 The third schematic diagram of a process for controlling the looper equipment of a pickling and rolling mill provided in this application; Figure 9 This application provides one of the electrical logic diagrams for controlling the looper equipment of a pickling and rolling mill. Figure 10 The second electrical logic diagram provided in this application for controlling the looper equipment of a pickling and rolling mill; Figure 11 The third electrical logic diagram provided in this application for controlling the looper equipment of a pickling and rolling mill; Figure 12 A schematic diagram of a process for controlling a double pinch roller device at the outlet of a push-pull pickling unit, provided for this application; Figure 13 One of the electrical logic diagrams provided in this application for controlling the double pinch roller device at the outlet of a push-pull pickling unit; Figure 14 The second electrical logic diagram provided in this application for controlling the double pinch roller device at the outlet of a push-pull pickling unit; Figure 15 The third electrical logic diagram provided in this application for controlling the double pinch roller device at the outlet of a push-pull pickling unit; Figure 16 The fourth electrical logic diagram provided in this application is for controlling the double pinch roller device at the outlet of a push-pull pickling unit. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] As described in the background section, the pickling and rolling mill is equipped with 15 sets of tension roll drives and 12 sets of looper drives. Both the tension roll drives and looper drives consist of motors, gearboxes, and couplings. Due to the thickness of the raw material, the maximum speed of the strip in the pickling and rolling mill is 450 meters per minute. The motors, gearboxes, and couplings of the tension rolls and loopers operate under the impact of frequent acceleration and deceleration over a long period of time. The high-load impact makes the motors, gearboxes, and couplings prone to damage. When the tension rolls and loopers of the pickling and rolling mill malfunction, the entire troubleshooting process includes: identifying the cause of the malfunction, disassembling the motor or gearbox, installing the motor or gearbox, correcting concentricity, optimizing the motor under no-load and under-load conditions. The entire process usually takes more than 10 hours and is considered a major downtime incident.

[0023] The push-pull pickling unit is equipped with exit double pinch rolls for pinching the strip during threading and tail-end rotation. These exit double pinch rolls include pinch rolls No. 1, No. 2, No. 3, and No. 4. Pinch rolls No. 1 and No. 3 form one pair, while pinch rolls No. 2 and No. 4 form the other. Pinch rolls No. 3 and No. 4 are the upper rolls, which can be raised and lowered under the control of hydraulic cylinders. When the strip is threaded, pinch rolls No. 3 and No. 4 lower, and the strip head is fed into the coiler jaws and wound 2-3 times, establishing tension in the coiler. As the strip moves, pinch rolls No. 3 and No. 4 raise. When the strip tail reaches the disc shear for correction, pinch rolls No. 3 and No. 4 lower again until the strip tail reaches the coiler, at which point pinch rolls No. 3 and No. 4 raise. However, there are two problems with the exit double pinch rolls: (1) The exit double pinch rolls of the push-pull pickling unit, pinch rolls No. 1, No. 2, No. 3 and No. 4 adopt separate speed control modes. When the strip head is threaded onto the coiler and the strip tail is swayed, the strip often arches at the exit. The arched strip is prone to collision with the exit slitting shear, resulting in abrasion quality problems. (2) When the motor, gearbox and coupling of the exit double pinch rolls fail, the unit will also be shut down for a long time to deal with the fault.

[0024] Therefore, how to effectively avoid prolonged shutdown of the unit when electrical equipment in cold rolling fails is a technical problem that urgently needs to be solved by those skilled in the art.

[0025] To resolve the above technical issues, please refer to Figure 1 This application provides a method for controlling electrical equipment in cold rolling mills. This method is applied to pickling mills and / or push-pull pickling mills. Each mill includes at least one equipment group, which is any one of a tension roll group, a looper, or an exit double pinch roll. Each equipment group includes at least two transmission devices driven by independent frequency converters, and multiple frequency converters within the same equipment group operate in a master-slave control mode.

[0026] Specifically, the cold rolling electrical equipment control method provided in this application includes the following steps: In step S100, when the main drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed main drive device according to the received one-key forced command, and sends a forced switching command to all slave drive devices in the same equipment group to designate a new main drive device from all slave drive devices, switch its inverter from slave mode to master mode, and the remaining slave drive devices follow the new main drive device to run.

[0027] In step S200, when a slave drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed slave drive device according to the received one-key forced command; the master drive device in the same equipment group continues to operate in master mode, and the remaining unfailed slave drive devices follow the master drive device.

[0028] Understandably, this application, by adopting a master-slave control mode for multiple drive devices within the same equipment group (such as tension roll group, looper, or exit double pinch roll), changes the traditional logic of independent control for a single drive device, effectively preventing quality problems such as strip arching and scratches caused by asynchronous speeds of multiple drive devices. Furthermore, when a main drive device or slave drive device in the same equipment group fails, the operator only needs to trigger a one-button forced command, and the controller can automatically isolate the faulty device and reassemble the master-slave control logic of the remaining normal devices, ensuring that all online devices continue to operate collaboratively. The entire process eliminates the need for downtime to wait for the disassembly, replacement, and complex debugging of the faulty device. The pickling and / or push-pull pickling units can shield the faulty device from continued operation, improving production efficiency and product quality.

[0029] In one optional embodiment, the transmission equipment comprises a motor, a gearbox, a coupling, and a frequency converter. The cold-rolling electrical equipment control method provided in this application further includes: determining that the transmission equipment has failed when any one of the motor, gearbox, coupling, or frequency converter in the transmission equipment fails.

[0030] Understandably, by treating the motor, gearbox, coupling, and frequency converter as a single transmission device for fault diagnosis, this application can more accurately identify faulty transmission devices in the equipment group, thereby triggering corresponding one-key forced operation. This ensures that when any component in the transmission device malfunctions, the transmission device can be isolated in a timely manner and the master-slave control relationship can be reconstructed, avoiding the shutdown of the entire production line due to a local fault.

[0031] To better understand the technical solution of this application, the equipment control method in the pickling and rolling mill will be explained below.

[0032] In one optional implementation, the cold rolling electrical equipment control method provided in this application is applied to a pickling mill. The pickling mill includes multiple tension roll groups, each including a No. 1 roll driven by a No. 1 frequency converter and a No. 2 roll driven by a No. 2 frequency converter. Under normal conditions (i.e., when all equipment is functioning correctly), the No. 1 frequency converter operates in master mode (i.e., No. 1 roll is the master drive device), and the No. 2 frequency converter operates in slave mode (i.e., No. 2 roll is the slave drive device).

[0033] like Figure 2As shown, when the main drive equipment in any equipment group fails, the controller sends a stop operation command to the inverter of the failed main drive equipment according to the received one-key forced command, and sends a forced switching command to all slave drive equipment in the same equipment group. Step S100 includes sub-steps S111 to S113.

[0034] Step S111: When the No. 1 roller in any tension roller group fails, the tension roller group is taken as the tension roller group to be controlled, and the forced command of the No. 1 frequency converter of the tension roller group to be controlled is input through the human-machine interface.

[0035] Step S112: When the controller receives a valid forced command for the No. 1 frequency converter of the tension roll group to be controlled, the controller sends a stop operation command to the No. 1 frequency converter of the tension roll group to be controlled, sends a forced switching command for the No. 1 frequency converter to the No. 2 frequency converter of the tension roll group to be controlled, and sends a signal simulating the operation of the No. 1 frequency converter of the tension roll group to the pickling mill interlock control program.

[0036] In step S113, when the No. 2 frequency converter of the tension roll group under control receives the forced switching command from the No. 1 frequency converter, its torque loop setpoint is switched to the torque component output by its own speed loop. Under the control of its own speed loop and torque loop, the No. 2 frequency converter of the tension roll group under control operates at the set speed of the pickling mill.

[0037] like Figure 3 As shown, when a slave drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed slave drive device according to the received one-key forced command; the master drive device in the same equipment group maintains the master mode operation, and the remaining unfailed slave drive devices follow the master drive device operation. Step S200 includes sub-steps S211 to S213.

[0038] Step S211: When the No. 2 roller in any tension roller group fails, the tension roller group is taken as the tension roller group to be controlled, and the forced command of the No. 2 frequency converter of the tension roller group to be controlled is input through the human-machine interface.

[0039] Step S212: When the controller receives a valid forced command from the No. 2 frequency converter of the tension roll group to be controlled, the controller sends a stop operation command to the No. 2 frequency converter of the tension roll group to be controlled and sends a signal simulating the operation of the No. 2 frequency converter of the tension roll group to the pickling mill interlock control program.

[0040] In step S213, the No. 1 frequency converter of the tension roll group to be controlled operates at the set speed of the pickling mill under the control of its own speed loop and torque loop.

[0041] Understandably, pickling and rolling mills are typically divided into multiple tension zones (such as uncoiling zone, process section, and coiling zone). Tension rolls are positioned between these zones, acting as "tension sources." By applying driving or braking forces, they establish and maintain different, preset tension levels in adjacent zones. Tension rolls are usually driven by motors, transmitting torque through the friction between the roll surface and the strip. Tension rolls are typically arranged in an S-roll configuration, where two or more tension rolls are arranged in an S-shape, allowing the strip to continuously wind through multiple tension rolls in an "S"-shaped path. The strip forms a wrap angle between the rolls, thus achieving a greater driving torque transmitted to the strip under limited tension, driving the strip to run at a set tension and speed. Pickling and rolling mills typically have tension roll groups No. 1, 2, 3, 4, 5, 6, 7, and 8.

[0042] To better understand the one-click forced emergency production solution for a faulty tension roll equipment in a pickling mill provided in this application, the following is a combination of... Figure 4 and Figure 5 The following explanation will be based on the No. 5 tension roller group.

[0043] Tension roll group No. 5 is installed between the acid tank and the No. 1 looper at the outlet of the pickling mill. Tension roll group No. 5 has two rolls: roll No. 1 and roll No. 2, with the strip forming an S-shape between them. To achieve high-precision tension control and speed coordination, rolls No. 1 and No. 2 of tension roll group No. 5 employ master-slave control. This master-slave control ensures load balance between the motors of rolls No. 1 and No. 2, preventing single-motor overload and avoiding strip slippage or tension fluctuations caused by speed asynchrony between rolls No. 1 and No. 2.

[0044] The No. 1 frequency converter (hereinafter referred to as No. 1 frequency converter) of tension roll group 5 drives the motor of roll No. 1 of tension roll group 5, and the No. 2 frequency converter (hereinafter referred to as No. 2 frequency converter) of tension roll group 5 drives the motor of roll No. 2 of tension roll group 5. Under normal operating conditions, frequency converter No. 1 operates in master mode, and frequency converter No. 2 operates in slave mode. In order to ensure that the pickling mill can continue to operate when the gearbox, motor, coupling, or frequency converter of rolls No. 1 and No. 2 of tension roll group 5 fails, this application adopts the following scheme.

[0045] The inverter status display screen of the pickling mill unit has a master-slave inverter forced function button for tension roller group 5. When the master-slave inverter forced button is pressed, a password input window pops up. After entering the correct password, the master-slave control forced function screen opens, displaying the forced button for inverters 1 and 2 of tension roller group 5. The two forced buttons are interlocked, allowing only one forced button to be forced to "1" at a time (e.g., only the forced button signal for inverter 1 or inverter 2 of tension roller group 5 can be "1"). The forced button for inverter 1 of tension roller group 5 is inactive and unusable when the output current of inverter 1 is greater than 0; it is active and usable when the output current of inverter 1 is equal to 0. The activation conditions for the forced button for inverter 2 of tension roller group 5 are similar. This ensures that forced operation can only be performed when either inverter 1 of tension roller group 5 or inverter 2 of tension roller group 5 has stopped running.

[0046] Inverter No. 1 operates in main mode and has a speed loop and a torque loop. The output of the speed loop of inverter No. 1 is used as the set value of the torque loop of inverter No. 1. Inverter No. 1 also sends the set value of the torque component of inverter No. 1 output from the speed loop to the PLC (i.e., the controller) via communication. The PLC sends the received torque component of inverter No. 1 to inverter No. 2 via communication. Inverter No. 2 has two options for the set value of the torque loop: (1) When inverter No. 2 receives the "1" signal sent by the PLC to force inverter No. 1 to stop running, the set value of the torque loop of inverter No. 2 is selected as the torque component output from the speed loop of inverter No. 2. Inverter No. 2 runs independently at the set speed of the unit under the control of the speed loop and torque loop of inverter No. 2. (2) When inverter No. 2 receives the “0” signal sent by PLC to inverter No. 1, that is, when inverter No. 1 is running normally in the main mode, the torque loop setting value of inverter No. 2 is selected by the torque component output by the speed loop of inverter No. 1 sent by PLC. Inverter No. 2 runs under the control of the speed loop of inverter No. 1 and the torque loop of inverter No. 2, thereby realizing the load balance between the No. 1 roller motor of tension roller group No. 5 and the No. 2 roller motor of tension roller group No. 5.

[0047] like Figure 4As shown, when one of the following devices—gearbox, motor, coupling, or inverter—driven by inverter No. 1 malfunctions (i.e., when roller No. 1 in tension roller group No. 5 malfunctions), pressing the inverter No. 1 forced button triggers the PLC to receive a "1" signal from the screen (i.e., the controller receives a valid forced command for inverter No. 1 in tension roller group No. 5). The PLC then sends a stop command to inverter No. 1, a "1" signal to inverter No. 2 (i.e., a forced switching command for inverter No. 1), and simultaneously sends a signal simulating the operation of inverter No. 1 to the pickling mill interlock control program. When inverter No. 1 actually stops, roller No. 1 can remain in a free roller state. When inverter #2 receives a "1" signal from the PLC forcing inverter #1 (i.e., when inverter #2 receives a forced switching command from inverter #1), the torque loop setting value of inverter #2 selects the torque component output from the speed loop of inverter #2. Under the control of inverter #2's speed and torque loops, inverter #2 operates at the set speed of the unit. The strip actually runs at the set speed of the unit under the sole drive of inverter #2. This ensures that if any one of the gearbox, motor, coupling, or inverter of roller #1 driven by inverter #1 fails, the PLC can drive the normally functioning inverter #2 to maintain the normal operation of the unit.

[0048] like Figure 5 As shown, when any one of the components of the gearbox, motor, coupling, or frequency converter driving roller No. 2 (i.e., roller No. 2 in tension roller group No. 5) malfunctions, pressing the forced operation button for frequency converter No. 2 triggers a "1" signal from the PLC (meaning the controller receives a valid forced operation command for frequency converter No. 2 in tension roller group No. 5). The PLC then sends a stop command to frequency converter No. 2 and simultaneously sends a signal simulating the operation of frequency converter No. 2 to the pickling mill interlock control program. When frequency converter No. 2 actually stops, roller No. 2 remains in a free roller state. Frequency converter No. 1 operates at the set speed of the mill under the control of its speed and torque loops. The strip actually runs at the set speed of the mill under the sole drive of frequency converter No. 1. This ensures that when any one of the components of the gearbox, motor, coupling, or frequency converter driving roller No. 2 malfunctions, the PLC can drive the normally functioning frequency converter No. 1 drive system, thus maintaining the normal operation of the mill.

[0049] In another alternative embodiment, the pickling mill also includes multiple loopers, each looper comprising a No. 1 rope pulley driven by looper No. 1 frequency converter, a No. 2 rope pulley driven by looper No. 2 frequency converter, and a No. 3 rope pulley driven by looper No. 3 frequency converter. Under normal circumstances (i.e., when all equipment is functioning correctly), looper No. 1 frequency converter operates in master mode (i.e., looper No. 1 rope pulley is the master drive device), while looper No. 2 and looper No. 3 frequency converters both operate in slave mode (i.e., looper No. 2 and looper No. 3 rope pulleys are both slave drive devices).

[0050] like Figure 6 As shown, when the main drive equipment in any equipment group fails, the controller sends a stop operation command to the inverter of the failed main drive equipment according to the received one-key forced command, and sends a forced switching command to all slave drive equipment in the same equipment group. Step S100 includes sub-steps S121 to S124.

[0051] Step S121: When the No. 1 pulley in any looper fails, the looper is designated as the looper to be controlled, and a forced command for the No. 1 frequency converter of the looper to be controlled is input through the human-machine interface.

[0052] Step S122: When the controller receives a valid forced command for the No. 1 frequency converter of the looper to be controlled, the controller sends a stop operation command to the No. 1 frequency converter of the looper to be controlled, sends a forced switching command for the No. 1 frequency converter to the No. 2 and No. 3 frequency converters of the looper to be controlled, and sends a signal simulating the operation of the No. 1 frequency converter of the looper to be controlled to the pickling mill interlocking control program.

[0053] Step S123: When the No. 2 variable frequency drive of the control loop receives the forced switching command of the No. 1 variable frequency drive, the set value of its torque loop is switched to the torque component output by its own speed loop; the No. 2 variable frequency drive of the control loop operates at the set speed of the pickling mill under the control of its own speed loop and torque loop.

[0054] Step S124: When the No. 3 frequency converter of the control loop receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by the speed loop of the No. 2 frequency converter of the control loop; the No. 3 frequency converter of the control loop operates under the control of its own torque loop and the speed loop of the No. 2 frequency converter of the control loop.

[0055] like Figure 7 As shown, when a slave drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed slave drive device according to the received one-key forced command; the master drive device in the same equipment group maintains the master mode operation, and the remaining unfailed slave drive devices follow the master drive device operation. Step S200 includes sub-steps S221 to S224.

[0056] Step S221: When the No. 2 pulley in any looper fails, the looper is designated as the looper to be controlled, and a forced command for the No. 2 frequency converter of the looper to be controlled is input through the human-machine interface.

[0057] Step S222: When the controller receives a valid forced command for the No. 2 frequency converter to be controlled, the controller sends a stop operation command to the No. 2 frequency converter to be controlled and sends a signal simulating the operation of the No. 2 frequency converter to the pickling mill interlock control program.

[0058] In step S223, the No. 1 frequency converter of the control looper operates at the set speed of the pickling mill under the control of its own speed loop and torque loop.

[0059] Step S224: When the No. 3 frequency converter under control does not receive the forced switching command of the No. 1 frequency converter, the set value of its torque loop remains the torque component output by the speed loop of the No. 1 frequency converter under control; the No. 3 frequency converter under control operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter under control.

[0060] Furthermore, such as Figure 8 As shown, step S200 also includes sub-steps S231 to S234.

[0061] Step S231: When the No. 3 pulley in any looper fails, the looper is designated as the looper to be controlled, and a forced command for the No. 3 frequency converter of the looper to be controlled is input through the human-machine interface.

[0062] Step S232: When the controller receives a valid forced command for the No. 3 frequency converter to be controlled, the controller sends a stop operation command to the No. 3 frequency converter to be controlled and sends a signal simulating the operation of the No. 3 frequency converter to the pickling mill interlock control program.

[0063] In step S233, the No. 1 frequency converter of the control looper operates at the set speed of the pickling mill under the control of its own speed loop and torque loop.

[0064] Step S234: When the No. 2 frequency converter of the control loop does not receive the forced switching command of the No. 1 frequency converter, its torque loop setting value is maintained as the torque component output by the speed loop of the No. 1 frequency converter of the control loop; the No. 2 frequency converter of the control loop operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter of the control loop.

[0065] Understandably, in a pickling and rolling mill, the looper essentially functions as a tension buffer and material storage device. It is positioned between different sections of the mill (such as the pickling section and the rolling mill section), providing a variable strip storage length. On a continuous production line in a pickling and rolling mill, equipment in different sections (such as welding machines, disc shears, tension levelers, and rolling mills) may require temporary stops in the strip flow due to process requirements. The looper absorbs this instantaneous speed difference by releasing or storing a certain length of strip, allowing other sections to operate stably without interruption, thus achieving true continuous rolling. Specifically, the pickling and rolling mill has an inlet looper, an outlet looper (No. 1), and an outlet looper (No. 2).

[0066] To better understand the one-button forced emergency production solution for the faulty looper equipment of the pickling and rolling mill provided in this application, the following is a combination of... Figures 9 to 11 Let's take the entrance loop as an example for explanation.

[0067] The inlet looper is installed between the welding machine and the tension leveler of the pickling and rolling mill. The inlet looper has three pulleys: inlet looper pulley No. 1, inlet looper pulley No. 2, and inlet looper pulley No. 3. The strip steel forms an S-shape between these three pulleys. To achieve high-precision tension control and speed coordination, inlet looper pulleys No. 1, No. 2, and No. 3 employ master-slave control. This master-slave control ensures load balance among the motors of these three pulleys, preventing single-motor overload and avoiding strip slippage or tension fluctuations caused by speed asynchrony among them.

[0068] The No. 1 frequency converter of the inlet looper (hereinafter referred to as No. 1 frequency converter) drives the No. 1 rope pulley motor of the inlet looper, the No. 2 frequency converter of the inlet looper (hereinafter referred to as No. 2 frequency converter) drives the No. 2 rope pulley motor of the inlet looper, and the No. 3 frequency converter of the inlet looper (hereinafter referred to as No. 3 frequency converter) drives the No. 3 rope pulley motor of the inlet looper. Under normal operating conditions, No. 1 frequency converter operates in master mode, while No. 2 and No. 3 frequency converters operate in slave mode. In order to ensure that the unit can continue to operate when any one of the gearboxes, motors, couplings, or frequency converters of the No. 1, No. 2, and No. 3 rope pulleys fails, this application adopts the following scheme.

[0069] The inverter status display screen of the pickling mill unit features a forced function button for the master / slave inverter at the inlet looper. Pressing this button triggers a password input window. Entering the correct password opens the forced control screen, displaying forced function buttons for inlet looper 1, 2, and 3. These three forced function buttons are interlocked, allowing only one button to be forced to a "1" signal at a time. The forced function button for inlet looper 1 is inactive and unusable when its output current is greater than 0; it is active and usable when its output current is 0. The activation conditions for forced function buttons for inlet looper 2 and 3 are similar. This ensures that forced operation can only be performed when inverters 1, 2, or 3 are already stopped.

[0070] Inverter No. 1 operates in main mode and has a speed loop and a torque loop. The output of the speed loop of inverter No. 1 serves as the setpoint of the torque loop of inverter No. 1. Inverter No. 1 also sends the setpoint of the torque component output from the speed loop of inverter No. 1 to the PLC via communication. The PLC sends the received torque component of inverter No. 1 to inverters No. 2 and No. 3 via communication. Inverter No. 2 has two options for the setpoint of the torque loop: (1) When inverter No. 2 receives the forced button signal of inverter No. 1 as "1" (i.e., when inverter No. 2 receives the "1" signal sent by the PLC to force inverter No. 1), the setpoint of the torque loop of inverter No. 2 is selected to receive the torque component output from the speed loop of inverter No. 2. (2) When inverter #2 receives a "0" signal from the forced button of inverter #1 (i.e., when inverter #2 receives a "0" signal from the PLC to force inverter #1), the torque loop setting value of inverter #2 is selected from the torque component output by the speed loop of inverter #1 sent by the PLC. Similarly, the torque loop setting value of inverter #3 also has two options: (1) When inverter #3 receives a "1" signal from the forced button of inverter #1, it selects to receive the torque component output by the speed loop of inverter #2. (2) When inverter #3 receives a "0" signal from the forced button of inverter #1, it selects the torque component output by the speed loop of inverter #1 sent by the PLC.

[0071] When the signals of the forced button for Inlet Loop 1, Inlet Loop 2, and Inlet Loop 2 are all "0", when Inlet 2 receives the "0" signal from the PLC to force Inlet 1, that is, when Inlet 1 is running normally in main mode, the torque loop setting value of Inlet 2 is selected by the torque component output by the speed loop of Inlet 1 sent by the PLC. Inlet 2 runs under the control of the speed loop of Inlet 1 and the torque loop of Inlet 2, thus achieving load balancing between Inlet Loop 2 pulley motor and Inlet Loop 1 pulley motor. Similarly, when inverter #3 receives a "0" signal from the PLC forcing inverter #1, meaning inverter #1 is operating normally in master mode, the torque loop setpoint of inverter #3 is selected from the torque component output by the speed loop of inverter #1, sent by the PLC. Inverter #3 operates under the control of both the speed loop of inverter #1 and the torque loop of inverter #3, achieving load balancing between the inlet loop sheave motor #3 and the inlet loop sheave motor #1. In other words, under normal circumstances, the strip steel actually operates at the unit's set speed under master-slave control driven by inverter #1 in master mode and inverters #2 and #3 in slave mode.

[0072] like Figure 9 As shown, when one of the following devices—gearbox, motor, coupling, or frequency converter—driven by the No. 1 frequency converter of the inlet looper malfunctions (i.e., when the No. 1 rope pulley of the inlet looper malfunctions), pressing the No. 1 frequency converter forced button will cause the PLC to receive a "1" signal from the screen that forces the No. 1 frequency converter (i.e., the controller receives a valid forced command for the No. 1 frequency converter of the inlet looper). The PLC will then send a stop operation command to the No. 1 frequency converter, send a "1" signal to the No. 2 and No. 3 frequency converters that forces the No. 1 frequency converter (i.e., a forced switching command for the No. 1 frequency converter), and simultaneously send a signal simulating the operation of the No. 1 frequency converter to the pickling and rolling mill interlocking control program. When the No. 1 frequency converter actually stops, the No. 1 rope pulley can remain in a free roll state. When inverter #2 receives a "1" signal from the PLC forcing inverter #1 (i.e., when inverter #2 receives a forced switching command from inverter #1), the torque loop setpoint of inverter #2 selects the torque component output from the speed loop of inverter #2. Inverter #2 operates at the set speed of the unit under the control of its speed loop and torque loop. When inverter #3 receives a "1" signal from the PLC forcing inverter #1 (i.e., when inverter #3 receives a forced switching command from inverter #1), the torque loop setpoint of inverter #3 selects the torque component output from the speed loop of inverter #2. Inverter #3 operates under the control of its speed loop and torque loop. This achieves load balancing between the inlet loop pulley motors #2 and #3, allowing the strip steel to actually operate at the set speed of the unit under master-slave control driven by inverter #2 in master mode and inverter #3 in slave mode.

[0073] like Figure 10 As shown, when any one of the components—gearbox, motor, coupling, or frequency converter—of the No. 2 rope pulley driven by the No. 2 frequency converter at the inlet loop malfunctions (i.e., when the No. 2 rope pulley at the inlet loop malfunctions), pressing the No. 2 frequency converter forced button triggers the PLC to receive a "1" signal from the screen (i.e., the controller receives a valid forced command for the No. 2 frequency converter at the inlet loop malfunction). The PLC then sends a stop command to the No. 2 frequency converter, a "0" signal to the No. 3 frequency converter to force the No. 1 frequency converter, and simultaneously sends a signal simulating the operation of the No. 2 frequency converter to the pickling and rolling mill interlocking control program. When the No. 2 frequency converter actually stops, the No. 2 rope pulley remains in a free roll state. The No. 1 frequency converter operates at the set speed of the mill under the control of its speed loop and torque loop. When inverter #3 receives a "0" signal from the PLC forcing inverter #1 (i.e., inverter #3 has not received a forced switching command from inverter #1), the torque loop setting value of inverter #3 selects the torque component output by the speed loop of inverter #1. Inverter #3 operates under the control of the speed loop of inverter #1 and the torque loop of inverter #3. This achieves load balancing between the inlet loop sheave motor #1 and the inlet loop sheave motor #3. The strip steel actually runs at the unit's set speed under master-slave control drive of inverter #1 in master mode and inverter #3 in slave mode.

[0074] like Figure 11 As shown, when any one of the components—gearbox, motor, coupling, or frequency converter—of the No. 3 rope pulley driven by the No. 3 frequency converter at the inlet loop malfunctions (i.e., when the No. 3 rope pulley at the inlet loop malfunctions), pressing the No. 3 frequency converter forced button triggers the PLC to receive a "1" signal from the screen (i.e., the controller receives a valid forced command for the No. 3 frequency converter at the inlet loop 3). The PLC then sends a stop command to the No. 3 frequency converter, a "0" signal to the No. 2 frequency converter to force the No. 1 frequency converter, and simultaneously sends a signal simulating the operation of the No. 3 frequency converter to the pickling and rolling mill interlocking control program. When the No. 3 frequency converter actually stops, the No. 3 rope pulley remains in a free roll state. The No. 1 frequency converter operates at the set speed of the unit under the control of its speed loop and torque loop. When inverter #2 receives a "0" signal from the PLC forcing inverter #1 (i.e., inverter #2 has not received a forced switching command from inverter #1), the torque loop setpoint of inverter #2 selects the torque component output from the speed loop of inverter #1. Inverter #2 operates under the control of the speed loop of inverter #1 and the torque loop of inverter #2. This achieves load balancing between the inlet loop pulley motor #1 and the inlet loop pulley motor #2. The strip steel actually runs at the unit's set speed under master-slave control drive of inverter #1 in master mode and inverter #2 in slave mode.

[0075] Furthermore, the equipment control methods in the push-pull pickling unit will be explained below.

[0076] In one optional embodiment, the cold rolling electrical equipment control method provided in this application is applied to a push-pull pickling unit. The push-pull pickling unit includes an outlet double pinch roll, comprising a No. 1 pinch roll driven by an outlet double pinch roll frequency converter 1, a No. 2 pinch roll driven by an outlet double pinch roll frequency converter 2, a No. 3 pinch roll driven by an outlet double pinch roll frequency converter 3, and a No. 4 pinch roll driven by an outlet double pinch roll frequency converter 4. Pinch rolls 1 and 3 form one pair of pinch rolls, and pinch rolls 2 and 4 form another pair of pinch rolls. Pinch rolls 1 and 2 are lower rolls, and pinch rolls 3 and 4 are upper rolls.

[0077] The control mode of the exit dual pinch rolls changes according to the pressing state of pinch rolls 3 and 4. Specifically, when pinch rolls 3 and 4 are raised, all four pinch rolls operate in their own speed and torque closed-loop modes. When pinch rolls 3 and 4 are pressed down, all four pinch rolls operate in a master-slave control mode. When pinch rolls 3 and 4 are pressed down and all pinch rolls are functioning normally, the No. 1 frequency converter of the exit dual pinch rolls operates in master mode (i.e., pinch roll 1 is the master drive device), while the No. 2, No. 3, and No. 4 frequency converters of the exit dual pinch rolls all operate in slave mode (i.e., pinch rolls 2, 3, and 4 are all slave drive devices).

[0078] like Figure 12 As shown, when the main drive equipment in any equipment group fails, the controller sends a stop operation command to the inverter of the failed main drive equipment according to the received one-key forced command, and sends a forced switching command to all slave drive equipment in the same equipment group. Step S100 includes sub-steps S131 to S135.

[0079] Step S131: When pinch rollers No. 3 and No. 4 are in the pressed state and pinch roller No. 1 is faulty, input the forced command of the No. 1 frequency converter of the exit double pinch roller through the human-machine interface.

[0080] Step S132: When the controller receives a valid forced command for the No. 1 frequency converter of the double pinch roller at the outlet, the controller sends a stop operation command to the No. 1 frequency converter of the double pinch roller at the outlet, sends a forced switching command for the No. 1 frequency converter to the No. 2, No. 3 and No. 4 frequency converters of the double pinch roller at the outlet, and sends a signal simulating the operation of the No. 1 frequency converter of the double pinch roller at the outlet to the interlock control program of the push-pull pickling unit.

[0081] In step S133, when the No. 2 frequency converter of the outlet double pinch roller receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by its own speed loop; under the control of its own speed loop and torque loop, the No. 2 frequency converter of the outlet double pinch roller runs at the set speed of the push-pull pickling unit.

[0082] Step S134: When the No. 3 frequency converter of the exit double pinch roller receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by the speed loop of the No. 2 frequency converter of the exit double pinch roller; the No. 3 frequency converter of the exit double pinch roller operates under the control of its own torque loop and the speed loop of the No. 2 frequency converter of the exit double pinch roller.

[0083] Step S135: When the No. 4 frequency converter of the exit double pinch roller receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by the speed loop of the No. 2 frequency converter of the exit double pinch roller; the No. 4 frequency converter of the exit double pinch roller operates under the control of its own torque loop and the speed loop of the No. 2 frequency converter of the exit double pinch roller.

[0084] Furthermore, when a slave drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed slave drive device according to the received one-key forced command; the main drive device in the same equipment group maintains the main mode operation, and the remaining unfailed slave drives follow the main drive device. Step S200 includes: When pinch rollers 3 and 4 are in the pressed state and pinch roller 2 malfunctions, a forced switching command for the outlet double pinch roller 2 inverter is input through the human-machine interface. When the controller receives a valid forced switching command for the outlet double pinch roller 2 inverter, it sends a stop operation command to the outlet double pinch roller 2 inverter and a signal simulating the operation of the outlet double pinch roller 2 inverter to the push-pull pickling unit interlock control program. The outlet double pinch roller 1 inverter operates at the set speed of the push-pull pickling unit under the control of its own speed loop and torque loop. When the outlet double pinch roller 3 inverter does not receive a forced switching command from inverter 1, its torque loop setpoint remains the torque component output by the speed loop of the outlet double pinch roller 1 inverter; the outlet double pinch roller 3 inverter operates under the control of its own torque loop and the speed loop of the outlet double pinch roller 1 inverter. When the No. 4 frequency converter of the exit double pinch roller does not receive the forced switching command of the No. 1 frequency converter, its torque loop setting value remains the torque component output by the speed loop of the No. 1 frequency converter of the exit double pinch roller; the No. 4 frequency converter of the exit double pinch roller operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter of the exit double pinch roller.

[0085] When pinch rollers 3 and 4 are in the pressed state and pinch roller 3 malfunctions, a forced switching command for the outlet double pinch roller 3 inverter is input through the human-machine interface. When the controller receives a valid forced switching command for the outlet double pinch roller 3 inverter, the controller sends a stop operation command to the outlet double pinch roller 3 inverter and a signal simulating the operation of the outlet double pinch roller 3 inverter to the push-pull pickling unit interlock control program. The outlet double pinch roller 1 inverter operates at the set speed of the push-pull pickling unit under the control of its own speed loop and torque loop. When the outlet double pinch roller 2 inverter does not receive a forced switching command from inverter 1, its torque loop setpoint remains the torque component output by the speed loop of the outlet double pinch roller 1 inverter; the outlet double pinch roller 2 inverter operates under the control of its own torque loop and the speed loop of the outlet double pinch roller 1 inverter. When the No. 4 frequency converter of the exit double pinch roller does not receive the forced switching command of the No. 1 frequency converter, its torque loop setting value remains the torque component output by the speed loop of the No. 1 frequency converter of the exit double pinch roller; the No. 4 frequency converter of the exit double pinch roller operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter of the exit double pinch roller.

[0086] When pinch rollers 3 and 4 are in the depressed state and pinch roller 4 malfunctions, a forced switching command for the outlet double pinch roller 4 inverter is input through the human-machine interface. When the controller receives a valid forced switching command for the outlet double pinch roller 4 inverter, the controller sends a stop operation command to the outlet double pinch roller 4 inverter and a signal simulating the operation of the outlet double pinch roller 4 inverter to the push-pull pickling unit interlock control program. The outlet double pinch roller 1 inverter operates at the set speed of the push-pull pickling unit under the control of its own speed loop and torque loop. When the outlet double pinch roller 2 inverter does not receive a forced switching command from inverter 1, its torque loop setpoint remains the torque component output by the speed loop of the outlet double pinch roller 1 inverter; the outlet double pinch roller 2 inverter operates under the control of its own torque loop and the speed loop of the outlet double pinch roller 1 inverter. When the No. 3 frequency converter of the exit double pinch roller does not receive the forced switching command of the No. 1 frequency converter, its torque loop setting value remains the torque component output by the speed loop of the No. 1 frequency converter of the exit double pinch roller; the No. 3 frequency converter of the exit double pinch roller operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter of the exit double pinch roller.

[0087] To better understand the one-button forced emergency production solution provided in this application for a push-pull pickling unit outlet double pinch roller equipment failure, the following is a combination of... Figures 13 to 16 Please provide an explanation.

[0088] The push-pull pickling unit's inverter status display screen features a master-slave inverter forced function button for the outlet double pinch rollers. Pressing this button triggers a password input window. Entering the correct password opens the master-slave control forced function screen, which displays forced function buttons for outlet double pinch rollers #1, #2, #3, and #4. These four forced function buttons are interlocked, allowing only one button to be forced to a "1" signal at a time. The forced function button for outlet double pinch roller #1 is inactive and unusable when its output current is greater than 0; it is active and usable when its output current is 0. The activation conditions for the forced function buttons for outlet double pinch rollers #2, #3, and #4 are similar. This ensures that forced operation can only be performed when inverter #1, inverter #2, inverter #3, or inverter #4 has already stopped running.

[0089] Inverter No. 1 operates in main mode and has a speed loop and a torque loop. The output of the speed loop of inverter No. 1 is used as the set value of the torque loop of inverter No. 1. Inverter No. 1 also sends the set value of the torque component of inverter No. 1 output from the speed loop to the PLC via communication. The PLC sends the received torque component of inverter No. 1 to inverters No. 2, No. 3 and No. 4 via communication. Inverter No. 2 has two options for the torque loop set value: (1) When inverter No. 2 receives a "1" signal from the forced button of inverter No. 1, it selects to receive the torque component output from the speed loop of inverter No. 2. (2) When inverter No. 2 receives a "0" signal from the forced button of inverter No. 1, it selects the torque component output from the speed loop of inverter No. 1 sent by the PLC. The torque loop setting value of inverter #3 also has two options: (1) When inverter #3 receives a "1" signal from the forced button of inverter #1, it selects to receive the torque component output by the speed loop of inverter #2. (2) When inverter #3 receives a "0" signal from the forced button of inverter #1, it selects the torque component output by the speed loop of inverter #1 sent by the PLC. The torque loop setting value of inverter #4 also has two options: (1) When inverter #4 receives a "1" signal from the forced button of inverter #1, it selects to receive the torque component output by the speed loop of inverter #2. (2) When inverter #4 receives a "0" signal from the forced button of inverter #1, it selects the torque component output by the speed loop of inverter #1 sent by the PLC.

[0090] When the signals of the forced buttons for the No. 1, No. 2, No. 3, and No. 4 frequency converters of the double pinch rolls at the outlet are all "0", when frequency converter No. 2 receives a "0" signal from the PLC to force frequency converter No. 1, that is, when frequency converter No. 1 is operating normally in the main mode, the torque loop setting value of frequency converter No. 2 is selected from the torque component output by the speed loop of frequency converter No. 1 sent by the PLC. Frequency converter No. 2 operates under the control of the speed loop of frequency converter No. 1 and the torque loop of frequency converter No. 2, thereby achieving load balancing between the No. 2 and No. 1 roller motors of the double pinch rolls at the outlet. When inverter #3 receives a "0" signal from the PLC that forces inverter #1 to operate normally in main mode, the torque loop setting value of inverter #3 is selected from the torque component output by the speed loop of inverter #1 sent by the PLC. Inverter #3 operates under the control of the speed loop and torque loop of inverter #1, achieving load balancing between the No. 3 and No. 1 motors of the double pinch rollers at the outlet. Similarly, when inverter #4 receives a "0" signal from the PLC that forces inverter #1 to operate normally in main mode, the torque loop setting value of inverter #4 is selected from the torque component output by the speed loop of inverter #1 sent by the PLC. Inverter #4 operates under the control of the speed loop and torque loop of inverter #1, achieving load balancing between the No. 4 and No. 1 motors of the double pinch rollers at the outlet. That is, when pinch rolls No. 3 and No. 4 are in the pressed state and all pinch rolls are normal, the strip actually runs at the unit's set speed under the master-slave control drive of inverter No. 1 in master mode and inverters No. 2, No. 3 and No. 4 in slave mode.

[0091] like Figure 13As shown, when any one of the components of the gearbox, motor, coupling, or frequency converter of the No. 1 pinch roller driven by the No. 1 frequency converter of the exit double pinch roller malfunctions (i.e., when the No. 1 pinch roller malfunctions), pressing the No. 1 frequency converter forced button will cause the PLC to receive a "1" signal from the screen that forces the No. 1 frequency converter (i.e., the controller receives a valid forced command from the No. 1 frequency converter of the exit double pinch roller). The PLC will then send a stop operation command to the No. 1 frequency converter, send a "1" signal to the No. 2, No. 3, and No. 4 frequency converters that forces the No. 1 frequency converter (i.e., a forced switching command for the No. 1 frequency converter), and simultaneously send a signal simulating the operation of the No. 1 frequency converter to the interlocking control program of the push-pull pickling unit. When the No. 1 frequency converter actually stops, the No. 1 pinch roller can remain in a free roller state. When inverter #2 receives a "1" signal from the PLC forcing inverter #1 (i.e., when inverter #2 receives a forced switching command from inverter #1), the torque loop setting value of inverter #2 selects the torque component output from the speed loop of inverter #2. Inverter #2 operates at the set speed of the unit under the control of its speed loop and torque loop. When inverter #3 receives a "1" signal from the PLC forcing inverter #1 (i.e., when inverter #3 receives a forced switching command from inverter #1), the torque loop setting value of inverter #3 selects the torque component output from the speed loop of inverter #2. Inverter #3 operates under the control of its speed loop and torque loop, achieving load balancing between the outlet double pinch roller motor #3 and the outlet double pinch roller motor #2. When inverter #4 receives a "1" signal from the PLC forcing inverter #1 (i.e., when inverter #4 receives a forced switching command from inverter #1), the torque loop setting value of inverter #4 selects the torque component output from the speed loop of inverter #2. Inverter #4 operates under the control of the speed loop of inverter #2 and the torque loop of inverter #4, achieving load balancing between the outlet double pinch roll motor #4 and the outlet double pinch roll motor #2. The strip actually runs at the unit's set speed under master-slave control driven by inverter #2 in master mode and inverters #3 and #4 in slave mode.

[0092] like Figure 14As shown, when any one of the components of the No. 2 pinch roller driven by the No. 2 frequency converter malfunctions (i.e., when the No. 2 pinch roller malfunctions), pressing the No. 2 frequency converter's forced operation button triggers a "1" signal from the PLC (meaning the controller receives a valid forced operation command for the No. 2 frequency converter). The PLC then sends a stop command to the No. 2 frequency converter and simultaneously sends a signal simulating the operation of the No. 2 frequency converter to the push-pull pickling unit's interlock control program. When the No. 2 frequency converter actually stops, the No. 2 pinch roller remains in a free roller state. The No. 1 frequency converter operates at the unit's set speed under the control of its speed loop and torque loop. When inverter #3 receives a "0" signal from the PLC forcing inverter #1 (i.e., inverter #3 has not received a forced switching command from inverter #1), the torque loop setpoint of inverter #3 remains the torque component output by the speed loop of inverter #1. Inverter #3 operates under the control of the speed loop of inverter #1 and the torque loop of inverter #3, achieving load balancing between the No.3 and No.1 pinch roller motors of the exit double pinch rollers. Similarly, when inverter #4 receives a "0" signal from the PLC forcing inverter #1 (i.e., inverter #4 has not received a forced switching command from inverter #1), the torque loop setpoint of inverter #4 remains the torque component output by the speed loop of inverter #1. Inverter #4 operates under the control of the speed loop of inverter #1 and the torque loop of inverter #4, achieving load balancing between the No.4 and No.1 pinch roller motors of the exit double pinch rollers. The steel strip actually runs at the unit's set speed under the master-slave control drive of inverter No. 1 in master mode and inverters No. 3 and No. 4 in slave mode.

[0093] like Figure 15As shown, when any one of the components of the No. 3 pinch roller driven by the No. 3 frequency converter (i.e., the No. 3 pinch roller malfunctions), pressing the No. 3 frequency converter's forced operation button triggers a "1" signal from the PLC (meaning the controller receives a valid forced operation command for the No. 3 frequency converter). The PLC then sends a stop command to the No. 3 frequency converter and simultaneously sends a signal simulating the operation of the No. 3 frequency converter to the push-pull pickling unit's interlock control program. This allows the No. 3 pinch roller to remain in a free roller state when the No. 3 frequency converter actually stops. The No. 1 frequency converter operates at the unit's set speed under the control of its speed and torque loops. When inverter #2 receives a "0" signal from the PLC forcing inverter #1 (i.e., inverter #2 has not received a forced switching command from inverter #1), the torque loop setpoint of inverter #2 remains the torque component output by the speed loop of inverter #1. Inverter #2 operates under the control of the speed loop of inverter #1 and the torque loop of inverter #2, achieving load balancing between the No.2 and No.1 pinch roller motors of the exit double pinch rollers. Similarly, when inverter #4 receives a "0" signal from the PLC forcing inverter #1 (i.e., inverter #4 has not received a forced switching command from inverter #1), the torque loop setpoint of inverter #4 remains the torque component output by the speed loop of inverter #1. Inverter #4 operates under the control of the speed loop of inverter #1 and the torque loop of inverter #4, achieving load balancing between the No.4 and No.1 pinch roller motors of the exit double pinch rollers. The steel strip actually runs at the unit's set speed under the master-slave control drive of inverter No. 1 in master mode and inverters No. 2 and No. 4 in slave mode.

[0094] like Figure 16As shown, when any one of the components of the No. 4 pinch roller driven by the No. 4 frequency converter malfunctions (i.e., when the No. 4 pinch roller malfunctions), pressing the No. 4 frequency converter's forced operation button triggers a "1" signal from the PLC (meaning the controller receives a valid forced operation command for the No. 4 frequency converter). The PLC then sends a stop command to the No. 4 frequency converter and simultaneously sends a signal simulating the operation of the No. 4 frequency converter to the push-pull pickling unit's interlock control program. This allows the No. 4 pinch roller to remain in a free roller state when the No. 4 frequency converter actually stops. The No. 1 frequency converter operates at the unit's set speed under the control of its speed and torque loops. When inverter #2 receives a "0" signal from the PLC forcing inverter #1 (i.e., inverter #2 has not received a forced switching command from inverter #1), the torque loop setpoint of inverter #2 remains the torque component output by the speed loop of inverter #1. Inverter #2 operates under the control of the speed loop of inverter #1 and the torque loop of inverter #2, achieving load balancing between the No.2 and No.1 pinch roller motors of the exit double pinch rollers. Similarly, when inverter #3 receives a "0" signal from the PLC forcing inverter #1 (i.e., inverter #3 has not received a forced switching command from inverter #1), the torque loop setpoint of inverter #3 remains the torque component output by the speed loop of inverter #1. Inverter #3 operates under the control of the speed loop of inverter #1 and the torque loop of inverter #3, achieving load balancing between the No.3 and No.1 pinch roller motors of the exit double pinch rollers. The steel strip actually runs at the unit's set speed under the master-slave control drive of inverter No. 1 in master mode and inverters No. 2 and No. 3 in slave mode.

[0095] In summary, the cold rolling electrical equipment control method provided in this application can maintain the continuous operation of the unit by effectively switching the torque setting value of the frequency converter torque loop when the motor, gearbox, coupling, or frequency converter of the pickling mill and push-pull pickling unit fails. Specifically, for tension roll groups 1 to 8 of the pickling mill, when the motor, gearbox, coupling, or frequency converter of one tension roll in a tension roll group fails, the torque setting value of the tension roll torque loop can be switched according to the different faulty devices by using a one-button tension roll frequency converter forced switch, allowing the pickling mill to continue operating without the faulty device. For the inlet looper, outlet looper 1, and outlet looper 2 of the pickling mill, each looper has 3 frequency converters driving 3 sheaves. When the motor, gearbox, coupling, or frequency converter of one sheave in a looper fails, the torque setting value of the sheave frequency converter torque loop can be switched according to the different faulty devices by using a one-button sheave frequency converter forced switch, allowing the pickling mill to continue operating without the faulty device. The push-pull pickling unit has four outlet pinch rolls, including pinch rolls 1 to 4. When the motor, gearbox, coupling, or frequency converter of one of the outlet pinch rolls fails, the torque setting value of the pinch roll torque loop can be switched according to the different faulty equipment by using the one-button forced pinch roll frequency converter. The push-pull pickling unit can then shield the faulty equipment from continuing to operate, thereby improving production efficiency and product quality.

[0096] Based on the above-described methodological concept, in one optional embodiment, this application also provides a cold rolling electrical equipment control device. This device is applied to a pickling mill and / or a push-pull pickling mill, which includes at least one equipment group, which is any one of a tension roll group, a looper, or an exit double pinch roll. Each equipment group includes at least two transmission devices driven by independent frequency converters, and multiple frequency converters within the same equipment group operate in a master-slave control mode. This device is used to execute the cold rolling electrical equipment control method as described in any of the foregoing embodiments, and the device includes: The first control module is used to send a stop operation command to the inverter of the faulty main drive equipment according to the received one-key forced command when the main drive equipment in any equipment group fails, and to send a forced switching command to all slave drive equipment in the same equipment group, so as to designate a new main drive equipment from all slave drive equipment, switch its inverter from slave mode to master mode, and the remaining slave drive equipment follow the new main drive equipment.

[0097] The second control module is used to send a stop operation command to the inverter of the faulty slave drive device according to the received one-key forced command in the event of a failure of the slave drive device in any equipment group; the master drive device in the same equipment group continues to operate in master mode, and the remaining unfaulty slave drive devices follow the master drive device.

[0098] Specific limitations regarding the control device for cold rolling electrical equipment can be found in the limitations of the control method for cold rolling electrical equipment described above, and will not be repeated here. Each module in the aforementioned control device for cold rolling electrical equipment can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in the electronic device in hardware form, or stored in the memory of the electronic device in software form, so that the processor can call and execute the corresponding operations of each module.

[0099] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0100] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A control method for cold-rolling electrical equipment, characterized in that, The method is applied to pickling mills and / or push-pull pickling mills, wherein the mills include at least one equipment group, which is any one of tension roll group, looper, or exit double pinch roll; each equipment group includes at least two transmission devices driven by independent frequency converters, and multiple frequency converters within the same equipment group operate in a master-slave control mode; the method includes: When the main drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed main drive device according to the received one-key forced command, and sends a forced switching command to all slave drive devices in the same equipment group to designate a new main drive device from all slave drive devices, switch its inverter from slave mode to master mode, and the remaining slave drive devices follow the new main drive device to run. When a slave drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed slave drive device according to the received one-key forced command; the master drive device in the same equipment group continues to operate in master mode, and the remaining unfailed slave drive devices follow the master drive device.

2. The control method for cold-rolling electrical equipment according to claim 1, characterized in that, The method is applied to a pickling and rolling mill, which includes multiple tension roll groups. Each tension roll group includes a No. 1 roll driven by a No. 1 frequency converter and a No. 2 roll driven by a No. 2 frequency converter. Under normal circumstances, the No. 1 frequency converter of the tension roll group operates in master mode, and the No. 2 frequency converter of the tension roll group operates in slave mode. The step of the controller sending a stop operation command to the frequency converter of the faulty main drive equipment according to the received one-key forced command, and sending a forced switching command to all slave drive equipment in the same equipment group when the main drive equipment in any equipment group fails includes: When the No. 1 roller in any tension roller group fails, the tension roller group is taken as the tension roller group to be controlled, and the forced command of the No. 1 frequency converter of the tension roller group to be controlled is input through the human-machine interface. When the controller receives a valid forced command from the No. 1 frequency converter of the tension roll group to be controlled, the controller sends a stop operation command to the No. 1 frequency converter of the tension roll group to be controlled, sends a forced switching command for the No. 1 frequency converter to the No. 2 frequency converter of the tension roll group to be controlled, and sends a signal simulating the operation of the No. 1 frequency converter of the tension roll group to the pickling mill interlock control program. When the No. 2 frequency converter of the tension roll group to be controlled receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by its own speed loop; under the control of its own speed loop and torque loop, the No. 2 frequency converter of the tension roll group to be controlled runs at the set speed of the pickling mill.

3. The control method for cold-rolling electrical equipment according to claim 2, characterized in that, When a slave drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed slave drive device according to the received one-key forced command; the master drive device in the same equipment group maintains master mode operation, and the remaining unfailed slave drive devices follow the master drive device. The steps include: When the No. 2 roller in any tension roller group fails, the tension roller group is taken as the tension roller group to be controlled, and the forced command of the No. 2 frequency converter of the tension roller group to be controlled is input through the human-machine interface. When the controller receives a valid forced command from the No. 2 frequency converter of the tension roll group to be controlled, the controller sends a stop operation command to the No. 2 frequency converter of the tension roll group to be controlled and sends a signal simulating the operation of the No. 2 frequency converter of the tension roll group to the interlocking control program of the pickling mill. The No. 1 frequency converter of the tension roll group to be controlled operates at the set speed of the pickling mill under the control of its own speed loop and torque loop.

4. The control method for cold-rolling electrical equipment according to claim 1, characterized in that, The method is applied to a pickling and rolling mill unit, which includes multiple loopers. Each looper includes a No. 1 rope pulley driven by a No. 1 frequency converter, a No. 2 rope pulley driven by a No. 2 frequency converter, and a No. 3 rope pulley driven by a No. 3 frequency converter. Under normal circumstances, the No. 1 frequency converter operates in master mode, while the No. 2 and No. 3 frequency converters operate in slave mode. The steps of sending a stop operation command to the frequency converter of the faulty master drive equipment and sending a forced switching command to all slave drive equipment in the same equipment group when the master drive equipment in any equipment group fails include: When the No. 1 pulley in any loop fails, the loop is designated as the loop to be controlled, and a forced command for the No. 1 frequency converter of the loop to be controlled is input through the human-machine interface. When the controller receives a valid forced command for the No. 1 frequency converter of the looper to be controlled, the controller sends a stop operation command to the No. 1 frequency converter of the looper to be controlled, sends a forced switching command for the No. 1 frequency converter to the No. 2 and No. 3 frequency converters of the looper to be controlled, and sends a signal simulating the operation of the No. 1 frequency converter of the looper to be controlled to the pickling mill interlock control program. When the No. 2 variable frequency drive of the control loop receives the forced switching command of the No. 1 variable frequency drive, its torque loop setting value is switched to the torque component output by its own speed loop; the No. 2 variable frequency drive of the control loop operates at the set speed of the pickling and rolling mill under the control of its own speed loop and torque loop. When the No. 3 frequency converter of the control loop receives the forced switching command of the No. 1 frequency converter, its torque loop setpoint is switched to the torque component output by the speed loop of the No. 2 frequency converter of the control loop; the No. 3 frequency converter of the control loop operates under the control of its own torque loop and the speed loop of the No. 2 frequency converter of the control loop.

5. The control method for cold-rolling electrical equipment according to claim 4, characterized in that, When a slave drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed slave drive device according to the received one-key forced command; the master drive device in the same equipment group maintains master mode operation, and the remaining unfailed slave drive devices follow the master drive device. The steps include: When the No. 2 pulley in any looper fails, the looper is designated as the looper to be controlled, and the forced command of the No. 2 frequency converter of the looper to be controlled is input through the human-machine interface. When the controller receives a valid forced command for the No. 2 frequency converter to be controlled, the controller sends a stop operation command to the No. 2 frequency converter to be controlled and sends a signal simulating the operation of the No. 2 frequency converter to the pickling mill interlock control program. The No. 1 variable frequency drive of the control looper operates at the set speed of the pickling and rolling mill under the control of its own speed loop and torque loop. When the No. 3 frequency converter of the control loop does not receive a forced switching command from the No. 1 frequency converter, its torque loop setting value remains the torque component output by the speed loop of the No. 1 frequency converter of the control loop; the No. 3 frequency converter of the control loop operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter of the control loop.

6. The control method for cold-rolling electrical equipment according to claim 4, characterized in that, When a slave drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed slave drive device according to the received one-key forced command; the master drive device in the same equipment group maintains master mode operation, and the remaining unfailed slave drive devices follow the master drive device. The steps include: When the No. 3 pulley in any looper fails, the looper is designated as the looper to be controlled, and the forced command of the No. 3 frequency converter of the looper to be controlled is input through the human-machine interface. When the controller receives a valid forced command for the No. 3 frequency converter of the looper to be controlled, the controller sends a stop operation command to the No. 3 frequency converter of the looper to be controlled and sends a signal simulating the operation of the No. 3 frequency converter of the looper to be controlled to the interlocking control program of the pickling mill. The No. 1 variable frequency drive of the control looper operates at the set speed of the pickling and rolling mill under the control of its own speed loop and torque loop. When the No. 2 switch frequency converter does not receive a forced switching command from the No. 1 switch frequency converter, its torque loop setting value remains the torque component output by the speed loop of the No. 1 switch frequency converter; the No. 2 switch frequency converter operates under the control of its own torque loop and the speed loop of the No. 1 switch frequency converter.

7. The control method for cold-rolling electrical equipment according to claim 1, characterized in that, The method is applied to a push-pull pickling unit, which includes an outlet double pinch roller. The outlet double pinch roller includes a No. 1 pinch roller driven by an outlet double pinch roller frequency converter 1, a No. 2 pinch roller driven by an outlet double pinch roller frequency converter 2, a No. 3 pinch roller driven by an outlet double pinch roller frequency converter 3, and a No. 4 pinch roller driven by an outlet double pinch roller frequency converter 4. Pinch rollers 1 and 2 are both lower rollers, while pinch rollers 3 and 4 are both upper rollers. The method is applied to a push-pull pickling unit, which includes an outlet double pinch roller. When the pinch roller is in the depressed state and all pinch rollers are normal, the No. 1 frequency converter of the exit double pinch roller operates in master mode, while the No. 2, No. 3, and No. 4 frequency converters of the exit double pinch roller all operate in slave mode. The steps of the controller sending a stop command to the frequency converter of the faulty main drive equipment and a forced switching command to all slave drive equipment in the same equipment group when the main drive equipment in any equipment group fails include: When pinch rollers No. 3 and No. 4 are in the pressed state and pinch roller No. 1 is faulty, input the forced command of the No. 1 frequency converter of the double pinch roller at the outlet through the human-machine interface. When the controller receives a valid forced command for the No. 1 frequency converter of the double pinch roller at the outlet, the controller sends a stop operation command to the No. 1 frequency converter of the double pinch roller at the outlet, sends a forced switching command for the No. 1 frequency converter to the No. 2, No. 3 and No. 4 frequency converters of the double pinch roller at the outlet, and sends a signal simulating the operation of the No. 1 frequency converter of the double pinch roller at the outlet to the interlock control program of the push-pull pickling unit. When the No. 2 frequency converter of the outlet double pinch roller receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by its own speed loop; under the control of its own speed loop and torque loop, the No. 2 frequency converter of the outlet double pinch roller runs at the set speed of the push-pull pickling unit. When the No. 3 frequency converter of the exit double pinch roll receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by the speed loop of the No. 2 frequency converter of the exit double pinch roll; the No. 3 frequency converter of the exit double pinch roll operates under the control of its own torque loop and the speed loop of the No. 2 frequency converter of the exit double pinch roll. When the No. 4 frequency converter of the exit double pinch roll receives the forced switching command of the No. 1 frequency converter, its torque loop setting value is switched to the torque component output by the speed loop of the No. 2 frequency converter of the exit double pinch roll; the No. 4 frequency converter of the exit double pinch roll operates under the control of its own torque loop and the speed loop of the No. 2 frequency converter of the exit double pinch roll.

8. The control method for cold-rolling electrical equipment according to claim 7, characterized in that, When a slave drive device in any equipment group fails, the controller sends a stop operation command to the inverter of the failed slave drive device according to the received one-key forced command; the master drive device in the same equipment group maintains master mode operation, and the remaining unfailed slave drive devices follow the master drive device. The steps include: When pinch rollers No. 3 and No. 4 are in the pressed state and pinch roller No. 2 is faulty, input the forced command of the No. 2 frequency converter of the double pinch roller at the outlet through the human-machine interface. When the controller receives a valid forced command for the No. 2 frequency converter of the double pinch roller at the outlet, the controller sends a stop operation command to the No. 2 frequency converter of the double pinch roller at the outlet and sends a signal simulating the operation of the No. 2 frequency converter of the double pinch roller at the outlet to the interlock control program of the push-pull pickling unit. The No. 1 frequency converter of the double pinch roller at the outlet operates at the set speed of the push-pull pickling unit under the control of its own speed loop and torque loop. When the No. 3 frequency converter of the exit double pinch roller does not receive the forced switching command of the No. 1 frequency converter, the set value of its torque loop remains the torque component output by the speed loop of the No. 1 frequency converter of the exit double pinch roller; the No. 3 frequency converter of the exit double pinch roller operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter of the exit double pinch roller. When the No. 4 frequency converter of the exit double pinch roller does not receive the forced switching command of the No. 1 frequency converter, its torque loop setting value remains the torque component output by the speed loop of the No. 1 frequency converter of the exit double pinch roller; the No. 4 frequency converter of the exit double pinch roller operates under the control of its own torque loop and the speed loop of the No. 1 frequency converter of the exit double pinch roller.

9. The control method for cold-rolling electrical equipment according to claim 1, characterized in that, The transmission equipment consists of a motor, gearbox, coupling, and frequency converter; the method further includes: When any one of the components in the transmission equipment—motor, gearbox, coupling, or frequency converter—fails, the transmission equipment is deemed to have malfunctioned.

10. A control device for cold-rolled electrical equipment, characterized in that, The device is applied to a pickling mill and / or a push-pull pickling mill, wherein the mill includes at least one equipment group, the equipment group being any one of a tension roll group, a looper, or an exit double pinch roll; each equipment group includes at least two transmission devices driven by independent frequency converters, and multiple frequency converters within the same equipment group operate in a master-slave control mode; the device is used to execute the cold rolling electrical equipment control method as described in any one of claims 1-9, and the device includes: The first control module is used to send a stop operation command to the inverter of the faulty main drive equipment according to the received one-key forced command when the main drive equipment in any equipment group fails, and to send a forced switching command to all slave drive equipment in the same equipment group, so as to designate a new main drive equipment from all slave drive equipment, switch its inverter from slave mode to master mode, and the remaining slave drive equipment follow the new main drive equipment to run. The second control module is used to send a stop operation command to the inverter of the faulty slave drive device according to the received one-key forced command in the event of a failure of the slave drive device in any equipment group; the master drive device in the same equipment group continues to operate in master mode, and the remaining unfaulty slave drive devices follow the master drive device.

Images