A method for quickly adjusting the brush roller pressure

Abstract

This invention relates to a method for rapidly adjusting the brush roller reduction, comprising an alkaline washing unit and an acid washing unit. Both the alkaline washing and acid washing units include several sets of brush rollers and their corresponding support rollers. Each set of brush rollers includes a brush roller motor and a brush roller adjustment mechanism. The brush roller motor is connected to an AC frequency converter, and the brush roller adjustment mechanism includes a brush roller screw motor connected to a motor control center (MCC). Both the frequency converter and the MCC are connected to a PLC system. The PLC system obtains the actual load current value of the brush roller motor through the frequency converter. The advantages of this invention are: by calculating the load current deviation of the brush roller motor, the brush roller screw motor performs periodic and uniform movements, avoiding jamming or disengagement of the brush roller screw motor. This increases the utilization rate of the brush rollers, improves the strip cleaning effect, and prevents strip scratches. The method is simple and easy to maintain, reducing maintenance difficulty and workload. It has excellent application value in the field of brush roller adjustment in the cleaning section of cold rolling mills.

Description

Technical Field

[0001] This invention relates to the field of strip cleaning technology, and in particular to a method for rapidly adjusting the pressure of a brush roller. Background Technology

[0002] With the increasing demand for automotive steel sheets and the widespread application of large-scale continuous annealing units, customers have placed higher requirements on the surface quality of strip steel. Therefore, the cleaning of strip steel before it enters the annealing furnace is particularly important. The cleaning section, located in the furnace area of ​​the unit, serves to remove oil and iron from the strip steel surface. Brush roller cleaning in the cleaning section is one of the crucial processes for ensuring the cleanliness of the strip steel surface. However, the slow current adjustment speed of the brush rollers means that impurities on the strip steel surface cannot be effectively removed, directly impacting surface quality and automotive steel sheet production. Summary of the Invention

[0003] The purpose of this invention is to provide a method for quickly adjusting the pressure of a brush roller. By adjusting the pressure pulse setting using the no-load current value of the brush roller motor, the brush roller screw motor can perform periodic and uniform movements, thereby improving the brushing effect.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for rapidly adjusting the pressure of a brush roller includes an alkaline washing unit and an acid washing unit. Both the alkaline washing unit and the acid washing unit include several sets of brush rollers and their corresponding support rollers. Each set of brush rollers includes a brush roller motor and a brush roller adjustment mechanism. The brush roller motor is connected to an AC frequency converter. The brush roller adjustment mechanism includes a brush roller screw motor, which is connected to a motor control center (MCC). Both the frequency converter and the motor control center (MCC) are connected to a PLC system. The PLC system obtains the actual load current value of the brush roller motor through the frequency converter. The method specifically includes the following:

[0006] 1) Calculate the load current deviation of the brush roller motor using the following formula:

[0007] Brush roller motor load current deviation = Target value of brush roller motor load current - Actual value of brush roller motor load current ①

[0008] In formula ①, the target value of the brush roller motor current = the no-load current value of the brush roller motor + the set value of the brush roller pressing current, and the range of the set value of the brush roller pressing current is 0 to 9A;

[0009] 2) Based on the load current deviation of the brush roller motor, the brush roller screw motor performs periodic and uniform movements, as detailed below.

[0010] When the load current deviation of the brush roller motor is greater than 3A, the brush roller screw motor continues to press down.

[0011] b. When the load current deviation of the brush roller motor is between 0.5A and 3A, the pressing pulse of the brush roller screw motor is set to press down at a cycle of m1 seconds pressing down for m2 seconds.

[0012] c. When the load current deviation of the brush roller motor is between -3A and -0.5A, the pressing pulse of the brush roller screw motor is set to lift at a cycle of pressing down for m2 seconds every m1 seconds.

[0013] When the absolute value of the load current deviation of the brush roller motor is less than 0.5A, the brush roller screw motor will not perform any adjustment.

[0014] The brush roller screw motor is a constant speed motor driven by the motor control center (MCC). The brush roller screw motor is connected in sequence to an overheat relay, a contactor, and a circuit breaker. The overheat relay, contactor, and circuit breaker are all located in the motor control center (MCC). By adjusting the brush roller screw motor, the amount of brush roller pressure is controlled, so that the brush roller is locked in the set position by the limit switch.

[0015] The AC frequency converter has a current detection device that detects the actual value of the load current of the brush roller motor, and the current detection device is connected to the PLC system.

[0016] Each set of brush rollers also includes a brush roller pressing limit switch, used to detect whether the brush roller is in the pressing position.

[0017] The no-load current value of the brush roller motor is obtained by manually starting the brush roller motor and detecting the current of the brush roller motor while it is running idle.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] By calculating the load current deviation of the brush roller motor, the brush roller screw motor is made to perform periodic and uniform movements, avoiding jamming or disengagement of the brush roller screw motor. This increases the utilization rate of the brush roller, improves the strip cleaning effect, and prevents strip scratches. The method is simple and easy to maintain, reducing maintenance difficulty and workload. It has great potential for promotion in the field of brush roller adjustment in the cleaning section of cold rolling mills. For the no-load current calibration of the brush roller motor, it is necessary to manually operate the button on the HMI screen while the brush roller is running and raised. This ensures that the brush roller is in a completely no-load state and is not affected by strip friction. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the rapid pressing process of the brush roller.

[0021] Figure 2 This is a schematic diagram of the system for quickly adjusting the brush roller pressure.

[0022] Figure 3 This is a schematic diagram of the rapid pressing process of the brush roller in the embodiment.

[0023] In the diagram: 1-Strip steel 2-Brush roller 3-Support roller 4-Brush roller motor 5-Frequency converter 6-Brush roller screw motor 7-Motor control center. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0025] See Figure 1 , Figure 2 A method for rapidly adjusting the pressing amount of a brush roller 2 includes an alkaline washing unit and an acid washing unit. Both the alkaline washing unit and the acid washing unit include three sets of brush rollers 2 and their corresponding support rollers 3. Each set of brush rollers 2 includes a brush roller motor 4, a brush roller 2 adjustment mechanism, and a brush roller 2 pressing limit switch. The brush roller 2 pressing limit switch is used to detect whether the brush roller 2 is in the pressing position. The brush roller motor 4 is connected to an AC frequency converter 5. The brush roller 2 adjustment mechanism includes a brush roller screw motor 6, which is a constant speed motor driven by a motor control center 7MCC. The method involves adjusting the brush roller screw motor... The screw motor 6 controls the pressing amount of the brush roller 2, locking it in a set position via a limit switch. The brush roller screw motor 6 is sequentially connected to an overheat relay, a contactor, and a circuit breaker. All three are housed within the motor control center 7MCC. Both the frequency converter 5 and the motor control center 7MCC are connected to a PLC system. The AC frequency converter 5 has a current detection device that detects the actual load current of the brush roller motor 4. This current detection device is connected to the PLC system. The method for quickly adjusting the pressing amount of the brush roller 2 includes the following:

[0026] 1) Calculate the load current deviation of brush roller motor 4 using the following formula:

[0027] Brush roller motor 4 load current deviation value = Brush roller motor 4 load current target value - Brush roller motor 4 load current actual value ①

[0028] In formula ①, the target current value of brush roller motor 4 = no-load current value of brush roller motor 4 + set value of brush roller 2 pressing current. Please describe the range of the set value of brush roller 2 pressing current as 2~3A, with zero value when the brush roller just touches the strip. The set value of brush roller 2 pressing current is given based on on-site production operation experience. The no-load current value of brush roller motor 4 is obtained by manually starting brush roller motor 4 and detecting the current of brush roller motor 4 when brush roller 2 is running idle.

[0029] 2) Based on the load current deviation value of brush roller motor 4, brush roller screw motor 6 performs periodic uniform operation, as follows:

[0030] a. When the load current deviation of the brush roller motor 4 is greater than 3A, the brush roller screw motor 6 continues to press down.

[0031] b. When the load current deviation of the brush roller motor 4 is between 0.5A and 3A, the operation of the brush roller screw motor 6 is adjusted to press down at a cycle of m1 seconds pressing down for m2 seconds.

[0032] c. When the load current deviation of the brush roller motor 4 is between -3A and -0.5A, the action adjustment of the brush roller screw motor 6 is to lift it up in a cycle of pressing down for m2 seconds every m1 seconds.

[0033] d. When the absolute value of the load current deviation of the brush roller motor 4 is less than 0.5A, the brush roller screw motor 6 will not perform any adjustment.

[0034] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0035]

Example 1

[0036] When brush roller 2 is in operation and open, manually calibrate the no-load current of brush roller motor 4, confirming that the no-load current value of brush roller motor 4 is 19.5A and the set value of brush roller 2 pressing current is 3A; see Figure 3 In the diagram, N1BST_1BRS_CUR_ON is the start signal for the No. 1 brush roller screw motor; G_1BST_1BRS_CUR_RUN is the signal that the No. 1 brush roller is in operation; N1BST_1BRS_CUR_CL is the signal that the No. 1 brush roller screw motor is rotating in the closed direction; and N1BST_1BRS_CUR_OP is the signal that the No. 1 brush roller screw motor is rotating in the open direction. When the load current deviation of brush roller 2 motor 4 is above 3A and positive, the N1BST_1BRS_CUR_CL signal will remain on, and the brush roller screw motor 6 will remain depressed. When the load current deviation of brush roller 2 motor 4 is above 3A and negative, the N1BST_1BRS_CUR_OP signal will remain on, and the brush roller screw motor... 6. When the load current deviation of brush roller motor 4 is between 0.5A and 3A and is positive, the N1BST_1BRS_CUR_CL signal will be turned on for 1.15 seconds every 5 seconds, and the brush roller screw motor 6 will be pressed down for 1.15 seconds every 5 seconds. When the current deviation is between 0.5A and 3A and is negative, the N1BST_1BRS_CUR_OP signal will be turned on for 1.15 seconds every 5 seconds, and the brush roller screw motor 6 will be raised for 1.15 seconds every 5 seconds. When the load current deviation of brush roller motor 4 is within ±0.5A, both N1BST_1BRS_CUR_CL and N1BST_1BRS_CUR_OP will not be turned on, and the brush roller screw motor 6 will not perform any adjustment.

[0037] This invention calculates the load current deviation of the brush roller motor to ensure that the brush roller screw motor performs periodic and uniform movements, thus preventing the brush roller screw motor from jamming or disengaging. This increases the utilization rate of the brush roller, improves the strip cleaning effect, and avoids strip scratches. The method is simple and easy to maintain, reducing maintenance difficulty and workload. It has excellent promotional value in the field of brush roller adjustment in the cleaning section of cold rolling mills. For the no-load current calibration of the brush roller motor, it is necessary to manually operate the button on the HMI screen while the brush roller is running and raised, which can ensure that the brush roller is in a completely no-load state and is not affected by strip friction.

Claims

1. A method for rapidly adjusting the brush roller pressing amount, characterized in that, The system includes an alkaline washing unit and an acid washing unit. Both units include several sets of brush rollers and their corresponding support rollers. Each set of brush rollers includes a brush roller motor and a brush roller adjustment mechanism. The brush roller motor is connected to an AC frequency converter. The brush roller adjustment mechanism includes a brush roller screw motor, which is connected to a motor control center (MCC). Both the frequency converter and the MCC are connected to a PLC system. The PLC system obtains the actual load current value of the brush roller motor through the frequency converter. The specific method includes the following: 1) Calculate the load current deviation of the brush roller motor using the following formula: Brush roller motor load current deviation = Target value of brush roller motor load current - Actual value of brush roller motor load current ① In formula ①, the target value of the brush roller motor load current = the brush roller motor no-load current value + the brush roller pressing current setting value, and the brush roller pressing current setting value ranges from 0 to 9A; 2) Based on the load current deviation of the brush roller motor, the brush roller screw motor performs corresponding actions, as follows: a. When the load current deviation of the brush roller motor is greater than 3A, the brush roller screw motor continues to press down; b. When the load current deviation of the brush roller motor is between 0.5A and 3A, the pressing pulse of the brush roller screw motor is set to press down at a cycle of m1 seconds pressing down for m2 seconds. c. When the load current deviation of the brush roller motor is between -3A and -0.5A, the pressing pulse of the brush roller screw motor is set to lift at a cycle of m1 seconds and m2 seconds. d. When the absolute value of the load current deviation of the brush roller motor is less than 0.5A, the brush roller screw motor will not perform any adjustment.

2. The method for rapidly adjusting the brush roller pressure according to claim 1, characterized in that, The brush roller screw motor is a constant speed motor driven by the motor control center (MCC). The brush roller screw motor is connected in sequence to an overheat relay, a contactor, and a circuit breaker. The overheat relay, contactor, and circuit breaker are all located in the motor control center (MCC). By adjusting the brush roller screw motor, the amount of brush roller pressure is controlled, so that the brush roller is locked in the set position by the limit switch.

3. The method for rapidly adjusting the brush roller pressure according to claim 1, characterized in that, The AC frequency converter has a current detection device for detecting the actual value of the load current of the brush roller motor, and the current detection device is connected to the PLC system.

4. The method for rapidly adjusting the brush roller pressure according to claim 1, characterized in that, Each set of brush rollers also includes a brush roller pressing limit switch, used to detect whether the brush roller is in the pressing position.

5. The method for rapidly adjusting the brush roller pressure according to claim 1, characterized in that, The no-load current value of the brush roller motor is obtained by manually starting the brush roller motor and detecting the current of the brush roller motor while it is running idle.

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