JPH10251881A - Method for automatically controlling pressure roll in continuous pickling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that since the pressure roll is manually or automatically lowered for 0.15sec as the coil diameter is decreased by 10cm to control the pressure roll in the conventional continuous pickling equipment, the pressing force of the roll is changed only roughly with the change in the diameter of band steel, and the generation of a crease pattern and meandering are not completely suppressed. SOLUTION: The pressure roll is automatically controlled in a continuos pickling equipment as follows. Namely, the revolving speed of the mandrel 5 and tension bridle 11 is detected, the diameter of the remaining coiled and steel 29 is obtained from the revolving speed and the thickness of the band steel 29, and the pressing force of the pressure roll 1 is controlled by a pressure roll controlling microcomputer 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically controlling a pressure roll in a continuous pickling facility. The present invention relates to a new improvement for automatically controlling an air pressure for pressing a pressure roll from an upper surface onto a hot-rolled coil being fed.

[0002]

2. Description of the Related Art Generally, a hot-rolled coil manufactured by hot rolling has an oxidized scale layer called black scale, and in order to remove this scale layer, a continuous pickling tank composed of a plurality of pickling tanks is used. Sent to equipment and removed. In continuous pickling equipment, parallel products with less trough in the sheet width direction are required for smooth operation of the equipment.However, hot-rolled special steel has higher hardness and higher elasticity than ordinary steel. Belt of the steel strip occurs between the take-up reel and the sending mandrel,
The tension was reduced, which hindered smooth operation. Also, on the entry side of the pickling tank, a soft and soft brush roll facility is provided, and the scale layer is peeled off by pressing the brush roll, but a sufficient pressing force is not applied due to the steel type of the coil to be passed. Therefore, the contact pressure is weakened, the removal efficiency of the brush roll is reduced, and scale remains. Furthermore, when a deformed coil such as a corrugated sheet, which is severely deformed in the width direction of the sheet, is passed through a continuous pickling facility, meandering (lateral flow) occurs. And the production was hindered.

As a measure for preventing the above-mentioned phenomenon, conventionally, FIG.
As shown by, each of the pinch rolls 15a, 15b, 16
a, 16b and pressure rolls 1 and 2 without a driving device are provided between the mandrel 5 to be sent to the continuous pickling equipment, and the coiled steel strip 29 on the buggy 19 is passed through the slitting guide 18 and the guide apron 17. A method is used in which an operator manually presses the pressure roll 1 from above so as to contact the steel strip 29 being fed to the continuous pickling equipment from the outside and give a crown to the steel strip 29. By manually pressing the pressure roll against the steel strip, a crown is generated on the plate, and a strong tension is applied between the mandrel and the tension bride roll. Therefore, by acting to eliminate the trough of the steel strip, giving a strain to the steel strip, generating cracks in the scale layer, promoting peeling of the scale, and increasing the tension between the reel to be wound and the reel to be sent out, It prevents meandering (lateral flow) of the steel strip.

[0004]

The automatic control method of the pressure roll in the continuous pickling facility has the following problems because it has been configured as described above. That is, the raising and lowering control of the pressure roll is visually controlled by an operator and manually controlled, and it is difficult to satisfactorily hold down the steel strip. In addition, the operator does not exclusively control the raising and lowering of the pressure roll, but also performs other operations, during which time the manual operation is interrupted, and a state of insufficient pressing force on the steel strip has occurred. Therefore, in order to alleviate the above-mentioned state, the diameter of the coil to be fed is calculated by the pressure roll control microcomputer, and the pressure roll is automatically lowered for 0.15 seconds every time the coil diameter decreases by 10 cm. However, this countermeasure is also insufficient to alleviate the above-mentioned condition, and the fluctuation of the air pressure sent to the air actuator for instructing the pressure roll for 0.15 seconds is large, and the pressing force applied to the steel strip is not stable. Because of this, the steel strip could not be held down, and if the pressing force was too large, there was a problem such as a broken pattern (the shoulder marks at both ends of the roll were transferred to the steel strip).
Manual operation and confirmation by the operator was required. Further, depending on the type of steel to be passed, there is also a problem that the strip is pushed back due to its strong elasticity, and the pressing effect is insufficient and the meandering of the strip cannot be suppressed.

[0005] The present invention has been made to solve the above-mentioned problems, and in particular, a plate between a pinch roll and a mandrel can be formed without damaging a steel strip product being sent to a continuous pickling facility. It is an object of the present invention to provide a method for automatically controlling a pressure roll in a continuous pickling facility capable of reliably pressing.

[0006]

SUMMARY OF THE INVENTION A method of automatically controlling a pressure roll in a continuous pickling facility according to the present invention comprises controlling a pressure roll provided in parallel with the mandrel above a mandrel for feeding a strip to the continuous pickling facility. In the method for automatically controlling a pressure roll in a continuous pickling facility, a first step of taking the diameter of the coiled steel strip from a host computer and pressing the pressure roll against the outer peripheral surface of the steel strip, By a pulse generator provided on a tension bridle roll downstream of the mandrel and the mandrel, a second step of detecting the rotation speed of the mandrel and the tension bridle roll, and inputting the detected rotation speed to a pressure roll control microcomputer, The pressure roll system is used to determine the thickness of the steel strip. A third step of calculating the thickness value of the steel strip with a microcomputer, and taking in the steel type data of the steel strip from the host computer and using a pressure setting data table and steel type data previously stored in the pressure roll control microcomputer; A fourth step of determining an air pressure set value for applying pressure to the pressure roll based on a combination with a thickness value of the steel strip.

The thickness of the steel strip is calculated based on the following equation. CA = (CA _CNT / TBgr × TBpls) 2π × Dmr × P (1) where CA: coil circumference length (mm) CA _CNT : pulse count number for each half rotation of the mandrel TBgr: gear of tension bridle roll the ratio TBpls: pulse number Dmr of the tension bridle rolls: tension bridle roll diameter [pi: pi P: pulse chestnut instrument (mandrel and length ratio of units per pulse of tension _{bridle) △ C = CA 8 -CA 1} /7 (2 ) T = △ C / π (3) where ΔC: circumferential difference every 1/2 turn CA ₁ -CA ₈ : data in memory t: thickness of strip (mm)

Further, in order to grasp the pressure value of the air actuator which is a driving source of the pressure roll, an air pressure value is detected by a pressure converter attached to the air actuator, and the air pressure value is controlled by the pressure roll control. The microcomputer performs a comparison operation between an air pressure set value set from a data table of the pressure roll control microcomputer and a current pressure value to automatically control the air pressure value by inputting the pressure set value to a current pressure. In this method, an electromagnetic valve connected to the air actuator is controlled by a pressure increase / decrease command from the pressure roll control microcomputer so that the values match, and the air pressure sent to the air actuator is automatically controlled.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for automatically controlling a pressure roll in a continuous pickling facility according to the present invention will be described below with reference to the drawings. FIG. 1 shows the overall structure of the present invention. A reference numeral 5 denotes a mandrel having a coiled steel strip 29, and a second pulse generator provided in a second motor M2 for rotating the mandrel 5. 12b is connected to the second rotation speed measurement counter 12B,
A first pressure roll 1 provided on a first pressure roll shaft 3 is provided on an outer periphery of the steel strip 29, and a second pressure roll 2 provided on a second pressure roll shaft 4 is provided on the first pressure roll 1. Is abutted. An air actuator 7 is connected to the second pressure roll shaft 4, and air 7 a from an air source is converted into an air pressure 27 via an electromagnetic valve 28 and a pressure converter 13 as a pressure regulating valve.
Has been entered.

The steel strip 29 is wound by a winding roll (not shown) through a tension bridle roll 11 driven by a first motor M1, and a first pulse generator 12a provided on the first motor M1 is a first pulse generator 12a. It is connected to the rotation speed measurement counter 12A. Each of the counters 12
The count values of A and 12B are input to the pressure roll control microcomputer 6 and the thickness calculation described later is performed. Data 10a such as diameter data and steel type data from the host computer 10 is obtained.
Is input to perform the air pressure setting 26, the control signal 8 is input to the solenoid valve 28, and the current pressure value 14 from the pressure transducer 13 is sent to the pressure roll control microcomputer 6 to calculate the current value. Has been entered. The mandrel 5 is configured as shown in FIG. 4 described above. The coil-shaped steel strip 29 is provided on the buggy 19 and the mandrel 5 is provided with the slitting guide 18 and the guide apron 17. It is sent to the tension bridle roll 11 of FIG.

Next, the operation will be described. First, as shown in FIG. 1, a coiled steel strip 29 mounted on the mandrel 5 is used.
In order to press the surface with the pressure roll 1, the diameter signal of the steel strip 29 from the host computer 10 is taken into the pressure roll control microcomputer 6, and the pressure rolls 1 and 2 are lowered and pressed. When the steel strip 29 is sent out to the continuous pickling equipment (not shown) in this state, the diameter of the steel strip 29 of the mandrel 5 is reduced, and the diameter is grasped and pressed with an optimum pressing force. A pressure roll control microcomputer for detecting the number of rotations of the mandrel 5 and the tension bridle 11 by the pulse generators 12a and 12b of the mandrel 5 and the tension bridle 11, and calculating the length of the strip 29 fed from the number of rotations. 6, the thickness of the remaining coiled strip 29 at the rotation speed and the thickness of the strip 29, that is, the remaining strip 2
In order to obtain the diameter 9, the thickness t of the steel strip 29 needs to be calculated by the pressure roll control microcomputer 6.

When the mounted steel strip 29 is rewound by the mandrel 5, since the springback strength varies depending on the material of the steel strip 29, the air pressure value 27 of the air actuator 7 is controlled as an optimum value. Then, the steel type data of the steel strip 29 is taken in from the host computer 10, a comparison operation is performed based on a combination of the steel type data and the plate thickness value, and the air pressure set value 26 of the data table previously stored in the pressure roll control microcomputer 6 is obtained from the result. A search is performed to determine the air pressure set value 26.

The air actuator 7 has a pressure transducer 13
The current pressure value 14, which is a signal from the pressure transducer 13, is input to the pressure roll control microcomputer 6, and the current pressure value 14 set in the data table is compared with the input current pressure value 14. If the current pressure value 14 is small, the air pressure increase command A is output, and if the current pressure value 14 is large, the air pressure reduction command B is output. By controlling the solenoid valve 28, the air pressure sent to the air actuator 7 is automatically controlled.

[0014]

Next, an actual example will be described. In preparation for passing the steel strip 29 through the continuous pickling equipment, the coil-shaped steel strip 29 transported by the buggy 19 is mounted on the mandrel 5 and the head of the steel strip 29 is fed into the sledge guide 18. Thereafter, as shown in the flow chart of FIG. 2, the strip steel 29 is centered by the sledge guide 18 and sent out until the head passes through the pinch rolls 16a and 16b, and the coiled strip 29 is transferred to the pinch rolls 15a and 15b.
(First step 49). Upper and lower pinch roll 1
When the head of the steel strip 29 is pressed by 5a, 15b, the guide table 17 is lowered, and the pressure rolls 1, 2 are lowered to start the control of pressing the steel strip 29. For the steel strip 29 mounted on the mandrel 5, the diameter of the steel strip 29 is sent from the host computer 10 to the pressure roll control microcomputer 6 (second step 50), and the descending distance of the pressure rolls 1, 2 is set (third step 51). At the same time, the air pressure set value which is the initial pressing pressure stored in the pressure roll control microcomputer 6 is set (fourth step 52).

At the start of the production, the thickness of the steel strip 29 is calculated (fifth step 53), the steel type data is taken in (sixth step 54), and the pressure set value is obtained from the data table 26 based on the steel type data and the thickness value. (7th step 5)
5) The air pressure set value is determined (eighth step 56). When the air pressure set value is set, the air pressure value 27 is detected by the pressure converter 13 attached to the air actuator 7, and this air pressure value 27 is input to the pressure roll control microcomputer 6, and the air pressure value 27
In order to automatically control the air pressure, a comparison calculation is performed between the air pressure set value already set and the current pressure value 14 (the ninth step 5).
7) If the current pressure value is small, a pressure increase command B is issued, if the pressure is large, an air pressure decrease command A is issued, and if the current pressure value is within the error range, a holding signal C for maintaining the current state is output to the solenoid valve 28.
In order that the air pressure set value and the current pressure value 14 match,
The air pressure value 27 is controlled by controlling the solenoid valve 28 (tenth step 58), and this control is repeated.

Next, the above case will be described in more detail. When the steel strip 29 mounted on the mandrel 5 is sent out to the pickling equipment, the diameter of the coiled steel strip 29 gradually decreases, so that the pressure rolls 1 and 2 follow the reduced diameter.
The first pulse generator (PLG) 12a provided on the tension bridle 11 and the mandrel 5 have to be lowered to lower the roll with an optimum pressing force.
The rotation speed is determined by the second pulse generator (PLG) 12b provided in the first stage. The rotation speed of the mandrel 5 and the tension bridle 11 is detected, and the detected rotation speed is input to the pressure roll control microcomputer 6. In addition, the automatic control of the pressure rolls 1 and 2 calculates the timing at which the mandrel has rotated by half from the mandrel rotation speed,
Automatic control is started by a 1/2 rotation signal. And
In order to obtain the thickness value of the steel strip 29, the rotation speed and the roll circumferential speed of the mandrel 5 and the tension bridle 11 are calculated. The calculated circumferential speed is stored in the pressure roll control microcomputer 6, and this control is repeated.

The calculation of the decreasing diameter of the steel strip 29 is performed by calculating the thickness of the steel strip shown in FIG. 3, and the thickness and the steel type of the steel strip are taken into the pressure roll control microcomputer 6 from the host computer 10. For the calculation of the diameter, first, a data memory 60 (data CA1 to CA8) comprising a RAM for storing eight 1/2 circumferential lengths is set, and the eight data CA1 to CA8 are stored in a pressure roll control microcomputer. The shift is performed for each sampling of the program 6. The pulse generators 12a and 12b provided on the mandrel 5 and the tension bridle roll 11 determine the 1/2 circumferential length of the coiled steel strip 29 mounted on the mandrel 5. Pulse signals from the pulse generators 12a and 12b of the mandrel 5 and the tension bridle roll 11 are taken into the pressure roll control microcomputer 6 and are halved.
Calculate the circumference. The coil circumference length CA is obtained by one equation. CA = (CA _CNT / TBgr × TBpls) 2π × Dmr × P (1) where CA _{CNT is} the pulse count number for every half rotation of the mandrel TBgr: the gear ratio of the tension bridle roll TBpls: the pulse number of the tension bridle roll Dmr : Tension bridle roll diameter π: Pi: Pulse increment (length ratio of mandrel and tension bridle per unit pulse)

The circumferential length CA calculated by the above equation (1) is stored in the memory CA1 in the data memory 60 (first step 80), and 1 is added to the memory counter (second step 81). This calculation is repeated, and the value of the memory counter reaches 16 (third step 82).
In order to calculate the remaining diameter of the coil-shaped steel strip 29, the reduced thickness, that is, the circumferential difference ΔC for every 1/2 turn of the coil, is calculated as 2
It is determined using the equations and the three equations. _{△ C = CA 8 -CA 1/} 7 (2) t = △ C / π (3) where △ C: inner circumference difference for each 1/2 Volume CA1～CA8: Data Memory (mm) t: the strip Thickness value (mm)

Next, as shown in the flow of FIG. 2 described above, the steel type data of the steel strip 29 is taken into the pressure roll control microcomputer 6 from the host computer 10 (sixth step 5).
4) The air pressure set value 26 is determined from the combination of the steel type data and the calculated value of the strip thickness value in the pressure set data table 26 stored in the pressure roll control microcomputer 6 in advance (eighth step 56).

The subsequent control can be performed in the same manner as described above. That is, the air pressure value 27 is detected by the pressure converter 13 attached to the air actuator 7, and the air pressure value 27 is input to the pressure roll control microcomputer 6 to automatically control the air pressure value 27. A comparison calculation is performed between the air pressure set value 26 set from the data table of the roll control microcomputer 6 and the current pressure value 14, and if the current pressure value 14 is small, the air pressure increase command B is set. If the error is within the error range, stop the signal and keep the current status
Is output to the solenoid valve 28, and the air pressure value 27 is controlled by controlling the solenoid valve 28 so that the pressure set value 26 and the current pressure value 14 coincide with each other. A constant and good pressing force can be applied.

[0021]

According to the present invention, the diameter of the steel strip, which changes every moment, is obtained from the rotation speed and the thickness of the steel strip, and the air pressure rise / fall signal sent to the air actuator for driving the pressure roll is automatically obtained. By controlling the product, a constant and good pressing force is always applied to the product to generate a good crown, enabling smooth production of continuous pickling equipment without scratching or breaking the strip to be fed. Is what you do. Therefore, the following effects can be stably maintained. 1. Scale peeling can be promoted. 2. Product meandering is prevented. 3. The deflection of the steel strip can be corrected. 4. The operation of the continuous pickling equipment is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a method for automatically controlling a pressure roll in a continuous pickling facility according to the present invention.

FIG. 2 is a flowchart of automatic pressure roll control of the present invention.

FIG. 3 is a flowchart for calculating a thickness of a pressure roll control microcomputer.

FIG. 4 is a perspective view of a conventional apparatus for sending out products to a continuous pickling facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure roll 2 Pressure roll 3 Pressure roll shaft 4 Pressure roll shaft 5 Mandrel 6 Pressure roll control microcomputer 7 Air actuator 10 Host computer 11 Tension bridle roll 12a 1st pulse generator 12b 2nd pulse generator 13 Pressure transducer 14 Current pressure Value 26 Air pressure set value 27 Air pressure value 28 Solenoid valve 29 Strip steel (coil)

Claims (3)

[Claims] 1. A continuous pickling facility for controlling a pressure roll (1) provided in parallel with said mandrel (5) above a mandrel (5) for feeding the strip (29) to the continuous pickling facility. In the automatic control method of the pressure roll in, the diameter of the coiled steel strip (29) the upper computer (10)
Take in the pressure roll (1)
A first step of pressing the outer peripheral surface of the mandrel (5), and a pulse generator (12a, 12b) provided on the tension bridle roll (11) downstream of the mandrel and the mandrel (5); And a second step of detecting the rotation speed of the tension bridle roll (11), and inputting the detected rotation speed to a pressure roll control microcomputer (6),
A third step of calculating the thickness value of the steel strip (29) by the pressure roll control microcomputer (6) to obtain the thickness value (t) of (29); and Capture steel type data and apply pressure to the pressure roll (1) in combination with the thickness value (t) of the steel strip using a pressure setting data table and steel type data previously stored in the pressure roll control microcomputer (6). And a fourth step of determining an air pressure set value (26) for controlling the pressure roll in the continuous pickling equipment. 2. The method for automatically controlling a pressure roll in a continuous pickling facility according to claim 1, wherein the thickness value (t) of the strip steel (29) is calculated based on the following equation. CA = (CA _CNT / TBgr × TBpls) 2π × Dmr × P (1) where CA: coil circumference length (mm) CA _CNT : pulse count number for each half rotation of the mandrel TBgr: gear of tension bridle roll the ratio TBpls: pulse number Dmr of the tension bridle rolls: tension bridle roll diameter [pi: pi P: pulse chestnut instrument (mandrel and length ratio of units per pulse of tension _{bridle) △ C = CA 8 -CA 1} /7 (2 ) T = ／ C / π (3) where ΔC: circumferential difference every 1/2 turn CA1 to CA8: data in memory t: thickness of strip (mm) 3. A pressure transducer (13) attached to the air actuator (7) for grasping a pressure value of an air actuator (7) which is a driving source of the pressure roll (1). Detecting and inputting the air pressure value to the pressure roll control microcomputer (6) and an air pressure set value set from a data table of the pressure roll control microcomputer (6) to automatically control the air pressure value. Perform a comparison operation with the current pressure value, so that the pressure set value and the current pressure value match,
The pressure control controller (6) controls a solenoid valve (28) connected to the air actuator (7) by a pressure increase / decrease command (A, B) from the microcomputer (6), and the air pressure sent to the air actuator (7) 3. The automatic control method for a pressure roll in a continuous pickling facility according to claim 1, wherein the pressure roll is automatically controlled.