A control method and device for adjusting the lead screw of a cleaning section brush roller

Abstract

The present invention relates to a control method and device for adjusting the lead screw of a brush roller in a cleaning section, and belongs to the technical field of cold rolling control methods and devices. The technical solution of the present invention is: a group of proximity switch sensors and iron stop devices are designed and installed on site, the control system uses the proximity switch sensor to collect the signal of the position change of the lead screw motor shaft, and then converts the changed signal into an effective count value that can be used for control through a certain logic algorithm processing, and realizes the stable adjustment and effective protection of the lead screw adjustment device of the brush roller pressure control mechanism through the counting control method. The beneficial effects of the present invention are: the stable adjustment and effective protection of the lead screw adjustment device of the brush roller pressure control mechanism are realized through the counting control method, and the lead screw adjustment device is prevented from getting stuck or falling out. The utilization rate of the brush roller is increased, the strip cleaning effect is improved, and the occurrence of phenomena such as strip scratches and nodules in the furnace is avoided. The device is simple and easy to maintain, which reduces the maintenance difficulty and workload while also reducing the cost of spare parts.

Description

Technical Field

[0001] The invention relates to a control method and device for adjusting a lead screw of a cleaning section brush roller, belonging to the technical field of cold rolling control methods and devices. Background Art

[0002] With the increasing demand for automotive sheets and high-end home appliance panels, and the widespread application of large-scale continuous annealing units, customers have put forward higher requirements for the surface quality of strip steel, and the cleaning of strip steel before entering the annealing furnace has become particularly important.

[0003] The continuous evacuation cleaning section, located in the furnace front area of ​​the unit, cleans contaminants from the strip surface. Strip reflectivity is a key indicator of strip cleaning effectiveness. However, shortly after the unit went into production, unstable control of the lead screw adjustment mechanism in the brush roller pressure control mechanism caused the adjustment mechanism to frequently become stuck or disengaged, rendering the brush rollers inoperable. This caused the reflectivity of the cleaned strip to drop from the normal 90% to less than 60%, accompanied by strip scratches, slight oxidation, and roller nodules.

[0004] In addition, the low precision of brush roller pressure adjustment during the production process causes premature wear of bristles, excessive consumption of spare parts, and gradual increase in production costs.

[0005] Realizing stable control of the screw adjustment in the continuous retraction cleaning section is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a control method and device for adjusting the screw of the brush roller in the cleaning section, which realizes the stable adjustment and effective protection of the screw adjustment device of the brush roller pressure control mechanism through counting control, avoids the screw adjustment device from getting stuck or falling out, improves the utilization rate of the brush roller, improves the strip cleaning effect, avoids the occurrence of strip scratches, nodules in the furnace and the like, and the device is simple and easy to maintain, reduces the maintenance difficulty and workload, and also reduces the spare parts cost. It has very good promotion value in the field of brush roller adjustment in the cleaning section of the cold rolling mill, and effectively solves the above-mentioned problems existing in the background technology.

[0007] The technical solution of the present invention is: a control method for adjusting the screw of the brush roller in the cleaning section, comprising the following steps: installing a proximity switch sensor and an iron stop device on site, the control system using the proximity switch sensor to collect the change in the position signal of the screw adjustment motor shaft, and then converting the position signal of the screw adjustment motor shaft into an effective count value that can be used for control through a control logic algorithm, and realizing stable adjustment and effective protection of the screw adjustment device of the brush roller pressure control mechanism through counting control.

[0008] The screw adjusts the change in the motor shaft position signal, including a signal that changes from 0 to 1 when the iron stop device rotates from the right side and approaches the proximity switch sensor, and then changes from 1 to 0 when it rotates away from the proximity switch sensor; a signal that changes from 0 to 1 when it rotates from the left side and approaches the proximity switch sensor, and then changes from 1 to 0 when it rotates away from the proximity switch sensor.

[0009] The control logic algorithm uses the actual load value of the brush roller to compare with the load setting value to obtain the current load level and judge the rotation direction of the iron block device. When the load is low, a pulse command is output to the motor to increase the load. During this process, the screw adjusts the motor shaft position signal each time, and the counting variable is increased by 1; when the load is high, a pulse command is output to the motor to reduce the load. During this process, the screw adjusts the motor shaft position signal each time each time, and the counting variable is decreased by 1; that is, the counting variable is increased or decreased by 2 for one rotation in the same direction; when the load is within the set value range, the pulse command output to the motor is stopped; by comparing the counting variable with the protection value, it is determined whether the screw position exceeds the upper limit or the lower limit, and if it exceeds the limit, the pulse command output to the motor is stopped.

[0010] A control device for adjusting a lead screw for a cleaning section brush roller comprises a proximity switch sensor, an iron stop device, a programmable controller, an HMI screen server and an operation client. The iron stop device is mounted on a synchronous gear on the outside of a rotating shaft of a lead screw adjustment motor. When the rotating shaft rotates, the iron stop device is driven to rotate together. The proximity switch sensor and the iron stop device are matched. The programmable controller and the HMI screen server are mounted in an electrical room, and the operation client is mounted in a main operation room. The output end of the proximity switch sensor is connected to the input end of the programmable controller, and the output end of the programmable controller is connected to the lead screw adjustment motor. The HMI screen server and the operation client are respectively connected to the programmable controller.

[0011] The lead screw adjustment motor is a constant speed motor with a high rotation speed and is controlled by a contactor. The control system uses a pulse triggering method to control the forward and reverse rotation of the lead screw adjustment motor.

[0012] The beneficial effects of the present invention are: stable adjustment and effective protection of the screw adjustment device of the brush roller pressure control mechanism are achieved through the counting control method, which avoids the screw adjustment device from getting stuck or falling out. The utilization rate of the brush roller is increased, which improves the strip cleaning effect and avoids the occurrence of strip scratches, nodules in the furnace and other phenomena. The device is simple and easy to maintain, which reduces the maintenance difficulty and workload while also reducing the spare parts cost. It has very good promotion value in the field of brush roller adjustment in the cleaning section of cold rolling mills. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a side view of the present invention;

[0014] Figure 2 is a top view of the present invention;

[0015] Figure 3 It is a control flow chart of the present invention;

[0016] In the figure: proximity switch sensor 1, iron stop device 2, screw adjustment motor 3, screw 4, and rotating shaft 5. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the invention implementation cases will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] A control method for adjusting a brush roller screw in a cleaning section comprises the following steps: installing a proximity switch sensor and an iron stop device on site; a control system using the proximity switch sensor to collect position signal changes of a screw adjustment motor shaft; and then converting the position signal of the screw adjustment motor shaft into an effective count value that can be used for control through a control logic algorithm. Stable adjustment and effective protection of a screw adjustment device of a brush roller pressure control mechanism are achieved through a count control method.

[0019] The screw adjusts the change in the motor shaft position signal, including a signal that changes from 0 to 1 when the iron stop device rotates from the right side and approaches the proximity switch sensor, and then changes from 1 to 0 when it rotates away from the proximity switch sensor; a signal that changes from 0 to 1 when it rotates from the left side and approaches the proximity switch sensor, and then changes from 1 to 0 when it rotates away from the proximity switch sensor.

[0020] The control logic algorithm uses the actual load value of the brush roller to compare with the load setting value to obtain the current load level and judge the rotation direction of the iron block device. When the load is low, a pulse command is output to the motor to increase the load. During this process, the screw adjusts the motor shaft position signal each time, and the counting variable is increased by 1; when the load is high, a pulse command is output to the motor to reduce the load. During this process, the screw adjusts the motor shaft position signal each time each time, and the counting variable is decreased by 1; that is, the counting variable is increased or decreased by 2 for one rotation in the same direction; when the load is within the set value range, the pulse command output to the motor is stopped; by comparing the counting variable with the protection value, it is determined whether the screw position exceeds the upper limit or the lower limit, and if it exceeds the limit, the pulse command output to the motor is stopped.

[0021] A control device for adjusting a lead screw for a brush roller in a cleaning section comprises a proximity switch sensor 1, an iron stop device 2, a programmable controller, an HMI screen server and an operation client. The iron stop device 2 is mounted on a synchronous gear outside a rotating shaft 5 of a lead screw adjustment motor 3. When the rotating shaft 5 rotates, the iron stop device 2 is driven to rotate together. The proximity switch sensor 1 and the iron stop device 2 are matched. The programmable controller and the HMI screen server are mounted in an electrical room, and the operation client is mounted in a main operation room. The output end of the proximity switch sensor 1 is connected to the input end of the programmable controller, and the output end of the programmable controller is connected to the lead screw adjustment motor 3. The HMI screen server and the operation client are respectively connected to the programmable controller.

[0022] The lead screw adjustment motor is a constant speed motor with a high rotation speed and is controlled by a contactor. The control system uses a pulse triggering method to control the forward and reverse rotation of the lead screw adjustment motor.

[0023] Example:

[0024] ① If Figure 1 The proximity switch sensor and iron stop device are installed on site to collect the position change signal of the motor shaft for adjusting the lead screw; the programmable controller and HMI screen server are installed in the electrical room, and the operation client is installed in the main operation room to detect the electrical connection between the proximity switch sensor, programmable controller, HMI screen server and operation client;

[0025] ② Add logic to the program to determine the difference between the actual load value of the brush roller and the process set load value when it is working, and add an error value to the logic; that is, when the actual load value is greater than the set load value + the error value, assign the Boolean value 1 to the load high variable; when the actual load value is less than the set load value - the error value, assign the Boolean value 1 to the load low variable; in other cases, the load high variable and the load low variable are set to 0;

[0026] ③ Add load control enabling logic to control whether the screw adjustment uses the load automatic adjustment function. Load control enabling activation requires the following four conditions to be met: load automatic adjustment is in the ON state, the line speed of the cleaning section exceeds 25m / min, the brush roller is in the operational state, and the supporting brush roller runs for more than 10s.

[0027] ④ When load control is enabled, a cyclic start / stop pulse is generated programmatically. The start and stop time parameters are adjustable. When the load high variable is 1, the cyclic start / stop pulse variable is assigned to the command variable for the screw adjustment motor to decrease the load. When the load low variable is 1, the cyclic start / stop pulse variable is assigned to the command variable for the screw adjustment motor to increase the load.

[0028] ⑤ The system collects the rising edge pulse and falling edge pulse of the proximity switch sensor signal and stores them in two groups of variables respectively.

[0029] ⑥ Add a counting module. When the load automatic adjustment function is used, when the load high variable is 1, the counting storage variable is reduced by 1 each time the rising edge pulse variable or the falling edge pulse variable of the proximity switch sensor signal is triggered; when the load low variable is 1, the counting storage variable is increased by 1 each time the rising edge pulse variable or the falling edge pulse variable of the proximity switch sensor signal is triggered.

[0030] During manual operation and adjustment, when the load reduction button is manually clicked, the count storage variable is reduced by 1 each time the rising edge pulse variable or falling edge pulse variable of the proximity switch sensor signal is triggered; when the load increase button is manually clicked, the count storage variable is increased by 1 each time the rising edge pulse variable or falling edge pulse variable of the proximity switch sensor signal is triggered.

[0031] When the count storage variable is greater than the upper limit of 110, the screw is locked and the load command variable is increased. When the count storage variable is less than the lower limit of 10, the screw is locked and the load command variable is decreased. The upper and lower limits are determined by the mechanical travel of the screw on site.

[0032] ⑦ Considering the inertial motion of the screw adjustment motor from running to stopping, when the load high or low adjustment enters the set value range, the load high or load low variable will be immediately reset to 0, and the proximity switch sensor signal within the inertial motion range will not be counted. To avoid this situation, the load high variable or load low variable needs to be delayed for 1 second to be shut down.

[0033] The present invention achieves stable adjustment and effective protection of the screw adjustment device of the brush roller pressure control mechanism through a counting control method, preventing the screw adjustment device from getting stuck or falling out. This increases the utilization rate of the brush rollers, improves the strip cleaning effect, and avoids strip scratches and furnace nodules. The device used in the scheme is simple and easy to maintain, reducing maintenance difficulty and workload while also reducing spare parts costs. This invention has great potential for promotion in the field of brush roller adjustment in the cleaning section of cold rolling mills.

Claims

1. A control method for adjusting the lead screw of the cleaning section brush roller, characterized in that: The control device for adjusting the lead screw of the cleaning section brush roller comprises a proximity switch sensor (1), an iron stop device (2), a programmable controller, an HMI screen server and an operation client. The iron stop device (2) is installed on a synchronous gear outside the rotating shaft (5) of the lead screw adjustment motor (3). When the rotating shaft (5) rotates, the iron stop device (2) is driven to rotate together. The proximity switch sensor (1) and the iron stop device (2) are matched. The programmable controller and the HMI screen server are installed in the electrical room, the operation client is installed in the main operation room, the output end of the proximity switch sensor (1) is connected to the input end of the programmable controller, and the output end of the programmable controller is connected to the screw adjustment motor (3); the HMI screen server and the operation client are respectively connected to the programmable controller; the control method includes the following steps: Proximity switch sensors and iron stop devices are installed on site. The control system uses the proximity switch sensor to collect the position signal changes of the screw adjustment motor shaft. Then, through the control logic algorithm, the position signal of the screw adjustment motor shaft is converted into an effective count value for control. The counting control method is used to achieve stable adjustment and effective protection of the screw adjustment device of the brush roller pressure control mechanism. The control logic algorithm uses the actual load value of the brush roller to compare with the load setting value to obtain the current load level and judge the rotation direction of the iron stop device. When the load is low, a pulse command to increase the load is output to the screw adjustment motor. During this process, the counting variable is increased by 1 every time the shaft position signal of the screw adjustment motor changes. When the load is high, a pulse command to reduce the load is output to the screw adjustment motor. During this process, the counting variable is decreased by 1 every time the shaft position signal of the screw adjustment motor changes. That is, the counting variable is increased or decreased by 2 for each rotation in the same direction. When the load is within the set value range, the pulse command output to the screw adjustment motor is stopped. By comparing the counting variable with the protection value, it is determined whether the screw position exceeds the upper limit or the lower limit. If it exceeds the limit, the pulse command output to the screw adjustment motor is stopped.

2. A method for controlling a brush roller adjustment screw in a cleaning section according to claim 1, characterized in that: The screw adjusts the motor shaft position signal change, including a signal that changes from 0 to 1 when the iron stop device rotates from the right side to approach the proximity switch sensor, and then changes from 1 to 0 when it rotates away from the proximity switch sensor; When the sensor is rotated from the left to the proximity switch, the signal changes from 0 to 1, and when the sensor is rotated away from the proximity switch, the signal changes from 1 to 0.

3. A method for controlling a brush roller adjustment screw in a cleaning section according to claim 1 or 2, characterized in that: The lead screw adjustment motor (3) is a constant speed motor, and the control system uses a pulse triggering method to control the forward and reverse rotation of the lead screw adjustment motor (3).

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