JPH07251994A - Method and device for controlling tension of continuous steel plate treating equipment - Google Patents

Abstract

PURPOSE:To calculate a tension additional amount owing to inertia of a plate and a carrier rule itself based on a plate conveyance speed, the rotation speed of a carrier roll, a plate weight, and an inertia moment and to suppress production of a tension fluctuation through correction of a torque reference based on a calculating result. CONSTITUTION:When no tension fluctuation of a plate is produced, control of torque is made on a plate conveyance mechanism 11 so that the conveyance speed Vd on the output side of a plate is adjusted to a value approximately equal to a conveyance speed reference VREFd. When a tension is fluctuated, the tension of a plate on the output side of loop car equipment is detected by a tension detector 5 and based on a deviation between the detecting tension value of a plate l and a tension reference set by a tension setter 6, the conveyance speed reference VREFd is correct%Based on the corrected value, a torque reference is determined by a speed control circuit 9. The torque reference is corrected by an addition part 23 by using an adjustable speed compensating amount calculated by an adjusted speed compensating circuit 22. Based on the corrected torque reference, torque control is applied on the plate conveying mechanism 11 by a torque control circuit 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate material tension control method and apparatus in a continuous steel plate processing facility for continuously surface-treating or cold rolling a plate material such as a steel plate.

[0002]

2. Description of the Related Art As a continuous steel plate processing equipment, a plate material wound in a coil is unwound and conveyed to a surface treatment or cold rolling treatment equipment by a plate material conveying mechanism for performing surface treatment or cold rolling of the plate material. There is one in which a series of processes for winding the product coil is performed after the process.

In such continuous steel plate processing equipment, it is necessary to continuously supply the plate material to the processing equipment without interruption. However, since the coiled supply plate material has a finite length, the plate material is supplied to the processing equipment. Cannot be continuously supplied. For this reason, a facility called a loop car facility is provided on the upstream side of the plate material transport mechanism, and the plate material rewound from the coil is continuously supplied to the processing facility while being retained in the loop car facility. Therefore, even if the rolled coil plate material reaches the end, while the plate material stays in the loop car equipment, the next coil is pulled out and connected to the previous coil plate material by means of welding or the like so that a continuous plate material Supply can be done.

By the way, while the plate material is continuously supplied to the processing equipment, the plate material connected thereto is repeatedly conveyed and stopped at the entrance side of the loop car equipment. Causes fluctuations in the tension of the plate material supplied to the processing equipment. Fluctuations in the tension of the plate material on the inlet side of the surface treatment or cold rolling treatment equipment may cause deformation and scratches of the sheet material in the surface treatment equipment with an annealing furnace, and in the cold rolling equipment Cause fluctuations. Therefore, it is very important to suppress the tension fluctuation of the plate material on the inlet side of the processing equipment from the viewpoint of quality control of the steel sheet, and in order to suppress this, a tension control device has been installed between the exit side of the loop car equipment and the inlet side of the processing equipment. Is used.

Conventionally, such a loop car facility and a tension control device are constructed as shown in FIG. In this loop car facility, the plate material 1 is stretched so as to be able to travel between a plurality of stages of movable carrier rolls 2a and a plurality of stages of fixed carrier rolls 2b, and travels between the carrier rolls 2 of each stage from the entrance side to the exit side of the loop car facility. By doing so, the plate material is retained and released.

That is, when the loop car 3 is moved in the X1 direction in FIG. 3, the movable carrier rolls 2a of a plurality of stages are also moved in the X1 direction. Therefore, the distance between the carrier rolls 2a and 2b is increased, and the plate material travels between 2a and 2b, so that the plate material is retained. On the contrary, when the loop car 3 moves in the X2 direction in FIG. 3 and the movable carrier rolls 2a of a plurality of stages move in the X2 direction, the retained plate material is discharged.

Due to the above operation, the sheet material is continuously conveyed on the exit side of the loop car equipment regardless of the conveying speed Ve on the entrance side of the loop car equipment, and the surface treatment step or cold step of the steel sheet is continuously continued.

On the other hand, in the tension control device, the speed of the plate material on the exit side of the loop car facility is set to the transfer speed reference (VREFd, that is, the target speed) by the transfer speed reference setter 4. Further, the deviation between the plate material tension on the exit side of the loop car equipment detected by the tension detector 5 and the tension reference (TREF) set by the tension setting device 6 is added by the addition unit 7, and the conveyance is performed based on this deviation. The speed reference VREFd is corrected by the speed corrector 8. Furthermore, the corrected transport speed reference is input to the speed control circuit 9 (ASR) and the corresponding torque reference is calculated. Then, the torque control circuit 10 (ATR) controls the torque of the plate material transport mechanism 11 based on the torque reference.

Here, when there is no fluctuation in tension, the transport speed Vd of the plate material is the transport speed reference VR which is the target value of the transport speed.
It is controlled so as to approach EFd. However, since the tension of the plate material fluctuates in practice, the transport speed reference VREFd is corrected based on the detected deviation between the tension value TFBK of the plate material 1 and the tension reference TREF, and the corrected value is used as the basis. A torque reference is obtained from the speed control circuit 9, and the plate material is torque-controlled. Further, the plate material on the entrance side of the loop car facility is also controlled by a means (not shown) on the basis of the required transport speed.

[0010]

By the way, in the equipment shown in FIG. 3, the conveying speed Ve of the plate material on the loop car entrance side is increased.
Changes. This mainly occurs because the plate material stoppage (Ve = 0) for welding work and the conveyance for plate material retention (Ve> 0) are repeated. Further, when the plate material is aligned at the welded portion or when there is a defective portion in the plate material, reverse running of the plate material (Ve <0), which is referred to as reverse movement, may be performed.
Therefore, the conveying speed Ve of the plate material on the loop car entrance side frequently changes, which causes the following problems.

In the loop car facility, a plurality of carrier rolls 2 are installed to convey the plate material 1. When the plate material conveying speeds Ve and Vd on the entrance and exit sides of the loop car equipment do not change, the rotation speeds of all the carrier rolls are constant. However, when the plate material on the entry side of the loop car equipment is accelerated, decelerated, stopped, or runs in reverse, the speed of the carrier roll also changes and in some cases it reverses. At this time, first, a change in the speed of the plate material, a change in the rotation speed of the carrier roll, and a reversal cause a change in the tension of the plate material.

That is, when the speed of the plate material or the rotation speed of the carrier roll changes, the inertia component of the weight of the plate material itself and the inertia component of the carrier roll itself must be accelerated / decelerated. The acceleration / deceleration power required for this is the amount of tension addition or reduction of the plate material. However, the torque control circuit does not predict and control the amount of change in tension due to these inertial forces in advance, but changes as a result and only adjusts the torque with respect to the measured change in tension. Absent. Therefore, changes in the speed of the plate material and the rotation speed of the carrier roll cause a sudden change in the plate material tension on the exit side of the loop car facility. On the other hand, the reversal of the carrier roll itself causes the tension change of the plate material.

Since the carrier roll is not driven by an electric motor or the like, the tension of the plate material increases every time the plate material passes through the carrier roll due to the bending process that occurs when the plate material is wound around the carrier roll. The amount of added tension generated by bending the plate material is called bend loss.

The bend loss Tb [kgf] increases in proportion to the cube of the plate thickness and in proportion to the plate width, and follows the following equation. Tb = K · B · t ³ / r ² (1) K: constant, B: plate width [mm], t: plate thickness [mm], r:
Carrier roll radius [mm] With the expansion of the plate width and plate thickness range in recent years, a plate having a plate thickness of 3.2 mm and a plate width of about 1600 mm has come to be passed. In this case, the bend loss per carrier roll is 100 to 200 kgf.

If the rotation directions of the carrier rolls are all the same as the plate material conveying direction on the exit side of the loop car facility, the total bend loss increases every time the plate material passes through the carrier rolls. Then, if there is no change in the rotation direction of the carrier roll, the final total of bend loss is constant, and tension fluctuation does not occur. However, if some of the carrier rolls are reversed, the direction of the bend loss will change for the reversed carrier rolls.
The plate tension at the exit side of the loop car equipment will change rapidly.

The abrupt change in tension of the plate material due to the change in the inertial force and the bend loss described above causes the yield of the product to be deteriorated and causes the operation failure due to the vibration of the plate material.

However, no measures have been taken so far for the tension fluctuation due to the above-mentioned causes. The present invention has been made in view of the above circumstances,
The first object of the present invention is to provide a tension control method and apparatus for continuous steel plate processing equipment that suppresses tension fluctuations due to plate material speed fluctuations and carrier roll rotation speed fluctuations in loop car equipment, and suppresses tension fluctuations due to bend loss fluctuations in loop car equipment. A second object of the present invention is to provide a tension control method and apparatus for a continuous steel plate processing facility, which suppresses deformation of plate material and fluctuation of plate thickness.

[0018]

In order to solve the above-mentioned problems, the invention according to claim 1 continuously conveys the plate material from the exit side of the loop car equipment for accumulating the plate material between a plurality of carrier rolls to the processing equipment. In the tension control method for continuous steel plate processing equipment equipped with a plate material conveying mechanism, the plate material conveying speed is controlled to match the target value, and the plate material tension detected at the exit side of the loop car equipment and the set plate material tension are set. The target value is corrected based on this value, the torque standard is calculated using this value, and when the plate material tension is controlled by controlling the torque of the plate material transport mechanism using this torque standard, the plate material is inserted into the loop car equipment. Based on the target value of the side transport speed or the inlet side transport speed and the target value of the outlet side transport speed or the outlet side transport speed, the plate material transport speed between the carrier rolls and each carrier Calculating a rotation speed of Lumpur, based on the work sheet conveying speed and the rotational speed and the plate weight and the carrier roll moment of inertia of each carrier roll, it calculates the tensioning caused by the inertia of the plate and the carrier roll itself,
It is a tension control method for a continuous steel plate processing facility that corrects the torque reference so as to suppress the tension fluctuation based on the added tension.

Further, the invention corresponding to claim 2 is a continuous steel plate processing equipment equipped with a plate material transfer mechanism for continuously transferring the plate material to the processing equipment from the exit side of the loop car equipment for accumulating the plate material between a plurality of carrier rolls. In the tension control device, the plate material conveyance speed is controlled to match the target value, and
The target value is corrected based on the plate tension detected on the exit side of the loop car facility and the set plate tension, and the torque standard is calculated using this value.The torque of the plate transport mechanism is calculated using this torque standard. Based on the torque control system to control and the target value of the input side transfer speed or the input side transfer speed and the output side transfer speed or the output side transfer speed target value of the plate material for the loop car equipment, the plate material transfer speed and each carrier roll on the carrier roll Carrier roll speed calculating means for calculating the rotation speed of the, based on the plate material conveying speed calculated by the carrier roll speed calculating means and the rotation speed of each carrier roll, the plate material weight and the carrier roll moment of inertia, the plate material and the carrier roll itself. The tension added component due to inertia is calculated, and the torque obtained by the torque control system is calculated from this tension added component. A tension controller for a continuous steel sheet processing facilities provided with the tension variation suppressing means for correcting quasi.

Further, the invention corresponding to claim 3 is a continuous steel plate processing facility equipped with a plate material transport mechanism for continuously transporting the plate material from the exit side of the loop car facility for retaining the plate material between a plurality of carrier rolls to the processing facility. In the tension control method,
Control the plate material conveyance speed to match the target value, and obtain a value that is the target value corrected based on the plate material tension detected on the exit side of the loop car facility and the set plate material tension,
The torque standard is calculated using this value, and when the plate material tension is controlled by controlling the torque of the plate material transfer mechanism using this torque reference, the input side transfer speed of the plate material to the loop car equipment or the input side transfer speed target value and Calculate the number of rotations of the carrier roll in the same direction as the plate material transport direction based on the output side transport speed or the target value of the output side transport speed, and the number of rolls that rotate in the same direction as the plate material transport direction and the plate thickness and width of the plate material. The tension control of the continuous steel plate processing equipment that calculates the tension added component that is the bend loss generated in the carrier roll based on and the carrier roll radius and corrects the torque reference to suppress the tension fluctuation based on this tension addition. Is the way.

Further, the invention corresponding to claim 4 is as follows:
In a tension control device for a continuous steel plate processing facility equipped with a plate material transport mechanism that continuously transports plate materials from the exit side to a loop car facility where the plate materials are retained between multiple carrier rolls, the plate material transport speed is made to match the target value. Control as
In addition, the target value is corrected based on the plate material tension detected on the exit side of the loop car equipment and the set plate material tension, and the torque reference is calculated using this value, and the plate material transport mechanism is used using this torque reference. Based on the torque control system for controlling the torque of the plate material, the carrier speed of the plate material to the loop car equipment, the target value of the carrier speed of the inlet side, and the target value of the carrier speed of the outlet side or the target value of the carrier speed of the outlet side, the carrier roll is in the same direction as the plate material carrier direction. Carrier roll direction determination means for calculating the number of rotations in the same direction, and the addition of tension, which is a bend loss generated in the carrier roll, based on the number of rotations in the same direction as the plate material transport direction, the plate thickness and plate width of the plate material, and the carrier roll radius. The tension of the continuous steel plate processing equipment provided with a tension fluctuation suppressing means for calculating the amount of the tension and correcting the torque reference calculated by the torque control system based on the added tension. A control device.

[0022]

In the tension control method for continuous steel plate processing equipment according to the first aspect, since the plate material speed between the carrier rolls is constant, it is necessary that the plate material inlet side transfer speed and the plate side material transfer speed in the loop car equipment are known. For example, the plate material conveying speed between the carrier rolls is calculated. Here, since the rotation of the carrier roll accompanies the conveyance of the plate material, the rotation speed of the carrier roll is also calculated. Next, the tension added component due to the inertia of the plate material and the carrier roll itself is calculated based on the plate material conveyance speed, each carrier roll rotation speed, the plate material weight, and the carrier roll moment of inertia, and the torque control is controlled based on this tension addition part. The amount is corrected.

In the tension control device for continuous steel plate processing equipment according to the second aspect, when the carrier feeding speed and the feeding speed of the plate material in the loop car equipment are input to the carrier roll speed calculating means, the inter-carrier roll speed is increased. Since the plate material speed is constant, the plate material conveying speed between the carrier rolls is calculated, and the rotation speed of the carrier roll is also calculated because the rotation of the carrier roll accompanies the plate material conveyance. Here, when the plate material conveying speed and the carrier roll rotation speed are input to the tension fluctuation suppressing means, the tension due to the inertia of the plate material and the carrier roll itself is calculated from the input speed and the plate material weight between the carrier rolls and the carrier roll inertia moment. The added amount is calculated, and the torque reference is corrected by the added tension amount.

In the tension control method for continuous steel plate processing equipment according to the third aspect of the present invention, since the plate material speed between the carrier rolls is constant, it is necessary to know the plate material inlet-side transfer speed and the plate-side transfer speed of the loop car equipment. For example, the plate material conveying speed between the carrier rolls is calculated. Here, since the rotation of the carrier roll accompanies the conveyance of the plate material, the rotation speed of the carrier roll is calculated. Further, the rotation directions of the respective carrier rolls are determined, and the number of rollers that rotate in the same direction as the plate material conveying direction is calculated. Then, based on the number of plates that rotate in the same direction as the plate material conveying direction, the plate thickness and the plate width, and the carrier roll radius, the tension addition component that is the bend loss generated in the carrier roll is calculated, and the plate material conveyance is performed by this tension addition component. The torque control amount for the mechanism is corrected.

In the tension control device for continuous steel plate processing equipment according to the fourth aspect, when the carrier-roll direction determining means is input with the sheet feeding speed and the sheet feeding speed in the loop car equipment, the carrier roll interval is determined. Since the plate material speed is constant, the plate material conveying speed between the carrier rolls is calculated, and the rotation speed of the carrier roll is also calculated because the rotation of the carrier roll accompanies the plate material conveyance. Further, the rotation directions of the respective carrier rolls are determined, and the number of rollers that rotate in the same direction as the plate material conveying direction is calculated. Here, when the number of rotations in the same direction as the plate material conveying direction is input to the tension fluctuation suppressing means, the carrier is generated based on the input number of rotations in the same direction, the plate thickness of the plate material, the plate width, and the carrier roll radius. A tension added component which is a bend loss generated in the roll is calculated, and the torque reference is corrected by this tension added component.

[0026]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a configuration diagram showing an embodiment of a tension control device for continuous steel plate processing equipment according to the present invention.

In FIG. 1, the loop car equipment is the same as that of the conventional example, and the same parts are denoted by the same reference numerals and described, and only different parts are described here. In this tension control device, the transport speed reference setter 4 that sets the transport speed reference VREF is used.
And a tension setter 6 for setting the tension reference of the plate material on the exit side of the loop car facility, a tension detector 5 for detecting the tension of the plate material on the exit side of the loop car facility, and a deviation between the detected plate material tension and the tension reference. An adding unit 7, a speed compensator 8 that corrects the transport speed reference VREFd based on the value calculated by the adding unit 7, a speed control circuit 9 that calculates a torque reference for setting the input transport speed value, and a plate material. A torque control circuit 10 for controlling the torque of the transport mechanism 11 and a plate material transport mechanism 11 for sending the plate material 1 to the next equipment are provided.

Further, the tension controller contacts the carrier rolls with the carrier roll speed calculation circuit 20 for obtaining the plate material speed between the carrier rolls and the rotation speed of each carrier roll from the transfer velocities Ve and Vd on the entrance and exit sides of the loop car facility. The plate width / plate thickness setting device 21 for setting the plate thickness and plate width of the plate material to be used, and the acceleration / deceleration which is the tension added by the acceleration / deceleration power necessary for the rotation of the carrier roll and the acceleration / deceleration of the plate material traveling between the carrier rolls. An acceleration / deceleration compensation circuit 22 that calculates a compensation amount and an addition unit 23 that corrects the torque reference based on the acceleration / deceleration compensation amount are added, and they are configured as a whole. Here, the carrier roll speed calculating circuit 20 is a carrier roll speed calculating means, and the plate width / thickness setting device 21, the acceleration / deceleration compensating circuit 22 and the adding section 23 form a tension fluctuation suppressing means.

Further, the plate material on the entrance side of the loop car facility is also controlled to the required transport speed reference VREFe by means not shown. Furthermore, the entrance-side conveyance speed Ve and the exit-side conveyance speed Vd are obtained by means not shown.

The operation of the tension control device of the continuous steel plate facility thus configured will be described. First, when there is no tension fluctuation, the delivery speed Vd of the plate material is the transfer speed reference V which is the target value of the transfer speed given by the transfer speed reference setter 4.
The plate material transport mechanism 11 is torque-controlled so as to approach REFd.

However, in reality, the tension of the plate material varies due to various reasons. Therefore, the tension detector 5 constantly detects the tension of the plate material on the exit side of the loop car facility, and based on the detected tension value of the plate material 1 and the deviation of the tension reference provided by the tension setting device 6, the transport speed reference setting device. The transport speed reference VREFd given by 4 is corrected, and the torque control is obtained by the speed control circuit 9 based on the corrected value.
This torque reference is corrected by the adder 23 using the acceleration / deceleration compensation amount calculated by the acceleration / deceleration compensation circuit 22, and the plate material transport mechanism 11 is torque-controlled by the torque control circuit 10 based on the corrected torque reference. .

Here, the acceleration / deceleration compensation amount is set in the plate width / plate thickness setter 21 and the plate material speed between each carrier roll and the rotation speed of each carrier roll, which are obtained by the carrier roll speed calculation circuit 20. It is calculated from the plate thickness and the plate width of the plate material contacting the carrier roll.

Next, the operation of the carrier roll speed calculation circuit 20 and the acceleration / deceleration compensation circuit 22 will be described in detail, and how the acceleration / deceleration compensation amount is calculated will be described. In FIG.
Carrier speeds V1, V2 ,. ． ． V2m-1, V2m ,. ． ． Vn
Ve = Ve V2 = Ve−2 · (Ve−Vd) / n V3 = V2 V4 = Ve−4 · (Ve− Vd) / n V5 = V4 ... (2) .V2m = Ve-2m. (Ve-Vd) / n V2m + 1 = V2m.Vn = Vd. Here, n represents the number of plate materials of the loop car, and m represents the number of stages of the carrier roll. Further, the lowermost carrier roll is set to m = 1, and the uppermost carrier roll is set to m.
= N / 2 stages.

The carrier roll speed calculation circuit 20 is
From the equation (2), the speed of each part of the plate material is calculated with respect to the transport speed Ve on the entrance side and the transport speed Vd on the exit side, which change from moment to moment. Further, since the rotation of the carrier roll is accompanied by the transportation of the plate material, the rotation speed of each carrier roll can also be obtained. Carrier roll speed calculation circuit 20
Further extracts the carrier roll corresponding to the plate material portion in the same transport direction as the plate material portion in contact with the tension detector 5. For example, if Vd> 0, acceleration / deceleration compensation is performed on the carrier roll corresponding to V2m> 0.

The acceleration / deceleration compensation circuit first calculates the acceleration / deceleration power due to the inertial force of the plate material between the carrier rolls. Acceleration / deceleration power PC with carrier roll
[Kw] is the moment of inertia of the carrier roll as GDC
If [kg · m ² ], PC = K1 · GDC · V2m · dV2m / dt (3) Here, K1 is a constant and d / dt is a differential operator.

On the other hand, the acceleration / deceleration power PS [kw] due to the plate material between the carrier rolls is the plate material weight W between the carrier rolls obtained by giving the plate thickness value and the plate width value.
When [kg] is given, PS = K2 · W · V2m · dV2m / dt (4) Here, K2 represents a constant.

Next, the acceleration / deceleration power P [kw], which is the sum of the acceleration / deceleration power of the plate material between the carrier rolls and the carrier rolls, obtained from the equations (2) and (3), is used as the torque correction amount. Calculate the quantity [kgf · m].

Tacc = K3 · P / N (5) Here, K3 represents a constant, and N represents an electric motor shaft rotation speed [rpm] in the plate material transport mechanism.

Since the transport speed reference and the actual transport speed of the plate material are almost the same, the transport speed references VREFd and VREFe may be used in place of the plate material transport speeds Vd and Ve in the tension control device of this embodiment. . At this time, the value of the carrier speed reference setter may be input as it is to the carrier roll speed calculation circuit 20, and the circuit can be further simplified.

When the plate width value and the plate thickness value at each position of the carrier roll are input from the plate width / plate thickness setter 21 to the acceleration / deceleration compensation circuit 22, the plate material or a plurality of plate materials having different plate widths are connected. In this case, since the weight of the plate material at each position is calculated, more accurate correction can be performed.

As described above, according to the present embodiment, in the tension control device for continuous steel plate processing equipment, the feeding speeds Ve and Vd of the loop car equipment are input to calculate the feeding speed between carrier rolls and the carrier roll rotation speed. A carrier roll calculation circuit is also provided, and an acceleration / deceleration compensation circuit that calculates the acceleration / deceleration power due to the inertial force of the plate material and carrier roll is provided to correct the torque reference. Not only tension fluctuation due to speed change but also tension fluctuation due to sudden tension fluctuation due to stop or reverse running of loop car equipment entrance / exit side equipment, eventually suppressing deformation of plate material and thickness fluctuation, and stable operation And the yield can be improved. Moreover, since it is only necessary to add simple circuit elements to the conventional device, it is possible to obtain a predetermined effect by inexpensive modification of the conventional device.

FIG. 2 is a block diagram showing another embodiment of the tension control device for continuous steel plate processing equipment according to the present invention. In FIG. 2, the loop car equipment is the same as that of the conventional example, the same portions are denoted by the same reference numerals, and only different portions will be described here.

In this tension control device, the transport speed reference VR
A transport speed reference setter 4 for setting the EF, a tension setter 6 for setting the tension reference of the plate material on the exit side of the loop car facility, and a tension detector 5 for detecting the tension of the plate material on the exit side of the loop car facility, are detected. An adding unit 7 that calculates the deviation between the plate tension and the tension reference, a speed corrector 8 that corrects the transport speed reference VREFd based on the value calculated by the adding unit 7, and a torque reference that sets the input transport speed value. There is provided a speed control circuit 9 for calculating, a torque control circuit 10 for controlling the torque of the plate material transport mechanism 11, and a plate material transport mechanism 11 for sending the plate material 1 to the next facility.

Further, the tension control device determines the carrier roll direction determination circuit 30 for determining the rotation direction of each carrier roll from the transport velocities Ve and Vd on the entry / exit side of the loop car facility.
A plate width / plate thickness setter 31 for setting the plate thickness and plate width of the plate material in contact with the carrier roll, and a bend loss calculation circuit 3 for calculating a bend loss compensation amount due to a change in bend loss.
2 and an adder 33 that corrects the torque reference based on the amount of bend loss compensation are added, and are configured as a whole.
Here, the carrier roll direction determination circuit 30 is a carrier roll direction determination means, and the plate width / thickness setting device 31, the bend loss calculation circuit 32, and the addition section 33 form a tension fluctuation suppressing means.

Further, the plate material on the entry side of the loop car facility is also controlled to the required transport speed reference VREFe by means not shown. Furthermore, the entrance-side conveyance speed Ve and the exit-side conveyance speed Vd are obtained by means not shown.

The operation of the tension control device for the continuous steel plate facility thus configured will be described. First, when there is no tension fluctuation, the plate material transport mechanism 11 is torque-controlled so that the plate material transport speed Vd approaches the transport speed reference given by the transport speed reference setter 4.

However, in reality, the tension of the plate material varies due to various reasons. Therefore, the tension detector 5 constantly detects the tension of the plate material on the exit side of the loop car facility, and based on the detected tension value of the plate material 1 and the deviation of the tension reference provided by the tension setting device 6, the transport speed reference setting device. The conveyance speed reference given by 4 is corrected, and the torque reference is obtained from the speed control circuit 9 based on the corrected value. This torque reference is corrected by the adder 33 using the bend loss compensation amount calculated by the bend loss calculation circuit 32, and the plate material transport mechanism 11 causes the torque control circuit 1 to perform correction based on the corrected torque reference.
Torque is controlled by 0.

At this time, the rotation direction of the carrier roll depends on whether or not the transport direction of the plate material portion in contact with the carrier roll is the same as the transport direction of the plate material portion in contact with the tension detector 5. The carrier roll direction determination circuit 30 determines whether the direction is the same as the direction. Further, the number of carrier rolls that rotate in the same direction as the plate material conveying direction is calculated. The bend loss compensation amount is the number of carrier rolls rotating in the same direction as the plate material transport direction calculated by the carrier roll direction determination circuit 30 and the plate thickness of the plate material in contact with the carrier roll set by the plate width / plate thickness setting device 31. It is calculated from the board width.

Next, the operation of the carrier roll direction determination circuit 30 and the bend loss calculation circuit 32 will be described in detail, and how the bend loss compensation amount is calculated will be described. Also in this embodiment, as in the previous embodiment, the sheet material conveying speeds V1, V2 ,. ． ． V
2m-1, V2m ,. ． ． If Vn is the transport speed on the inlet side of the loop car facility and Vd is the transport speed on the outlet side of Vn,
It can be obtained from equation (2).

The condition that the m-th stage carrier roll rotates in the same direction as the plate material conveying direction is that V2m> 0, and m> n.Ve/ {2. (Ve-Vd)} (6).

Since the value on the right side obtained by the equation (6) is a real number, M = Int [n.Ve/ {2. (Ve-Vd)}] + 1 (7) The carrier roll of is rotating in the same direction as the plate material conveying direction. Therefore, in the n-strand loop car facility, the number N of carrier rolls rotating in the same direction as the sheet material conveying direction is N = 2 · [(n / 2−M) +1] (8). The carrier roll direction determination circuit is currently rotating in the same direction as the plate material transport direction from the formula (8) with respect to the transport speed Ve on the entrance side and the transport speed Vd on the exit side that change from moment to moment. The number N of carrier rolls is obtained.

Next, the bend loss calculation circuit 32 uses the judgment result from the carrier roll direction judgment circuit and the plate thickness and plate width of the plate material from the plate width / plate thickness setter 31 to calculate the tension of the carrier roll according to the equation (1). Calculate the add-on or bend loss. Further, the bend loss compensation amount ΛTq, which is the torque correction amount to the torque control circuit 10, is

[0053]

[Equation 1] Becomes Here, C is a constant obtained from the roll diameter and the gear ratio of the plate material conveying device, and Tbi represents the bend loss of the i-th carrier roll among the carrier rolls rotating in the same direction as the plate material conveying direction.

Since the transport speed reference and the actual transport speed of the plate material are almost the same, the transport speed references VREFd and VREFe may be used in place of the plate material transport speeds Vd and Ve in the tension control device of this embodiment. . At this time, the value of the carrier speed reference setter may be input as it is to the carrier roll speed calculation circuit 20, and the circuit can be further simplified.

Further, when the plate width value and the plate thickness value at each position of the carrier roll are inputted from the plate width / plate thickness setter 31 to the bend loss calculation circuit 32, the plate material and a plurality of plate materials having different plate widths are connected. Even in some cases, since the bend loss is calculated from the plate width value and the plate thickness value at each position, more accurate correction can be performed.

As described above, according to this embodiment, the tension control device for the continuous steel plate processing equipment is provided with the carrier roll direction determining means for calculating the number of carrier rolls rotating in the same direction as the plate material conveying direction, and the bend loss in the carrier rolls is provided. Since a bend loss calculation circuit that calculates the amount of tension applied to the plate material is provided to sequentially correct the torque reference, not only tension fluctuations due to changes in the transport speed at the entry / exit side of the loop car equipment Even if the tension changes suddenly due to stoppage or reverse running, the tension change is suppressed, and thus the deformation of the plate material and the plate thickness change are suppressed, and stable operation and improvement in yield can be achieved. Moreover, since it is only necessary to add simple circuit elements to the conventional device, it is possible to obtain a predetermined effect by inexpensive modification of the conventional device.

Further, torque-based correction means for calculating acceleration / deceleration power corresponding to one embodiment of the present invention,
It is possible to use it in combination with the torque-based correction means based on the bend loss calculation corresponding to another embodiment.
The tension fluctuation of the plate material can be suppressed more than using each of them alone.

Further, in the one embodiment and the other embodiments according to the present invention, the case where the loop car equipment is provided on the inlet side of the steel plate processing equipment has been described. However, in the actual continuous steel plate processing equipment, a loop car equipment is also installed between the steel plate processing equipment outlet side and the product coil winding section, and for the cutting work for winding the plate material as a coil, etc. The situation is similar to. At this time, the plate material on the steel plate processing equipment outlet side, that is, the loop car equipment inlet side is continuously conveyed,
Tension is controlled. It goes without saying that the present invention can also be applied to plate material tension control on the outlet side of such steel plate processing equipment.

[0059]

As described above in detail, according to the present invention, there is provided a tension control method and apparatus for a continuous steel plate processing facility which suppresses tension fluctuations due to plate material speed fluctuations and carrier roll rotation speed fluctuations in loop car equipment. Further, it is possible to provide a tension control method and apparatus for continuous steel plate processing equipment that suppresses tension fluctuation due to bend loss fluctuation in loop car equipment, and thus it is possible to suppress plate material deformation and plate thickness fluctuation.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a tension control device for continuous steel plate processing equipment according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of a tension control device for continuous steel plate processing equipment according to the present invention.

FIG. 3 is a configuration diagram showing a known loop car facility and a conventional tension control device attached to it.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Plate material, 2a, 2b ... Carrier roll, 3 ... Loop car, 4 ... Conveyance speed standard setting device, 5 ... Tension detector, 6
... tension setting device, 7 ... adder, 8 ... speed corrector, 9 ... speed control circuit, 10 ... torque control circuit, 11 ... plate material transport mechanism, 20 ... carrier roll speed calculation circuit, 21 ... plate width /
Plate thickness setting device, 22 ... Acceleration / deceleration compensation circuit, 23 ... Addition unit, 3
0 ... Carrier roll direction determination circuit, 31 ... Plate width / plate thickness setting device, 32 ... Bend loss calculation circuit, 33 ... Addition unit, Vd
Outgoing transport speed, Ve ... Incoming transport speed, VREFd ... Outgoing transport speed reference, VREFde ... Incoming transport speed reference.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G05D 15/01

Claims (4)

[Claims] 1. A tension control method for a continuous steel plate processing facility equipped with a plate material transport mechanism for continuously transporting a plate material from a delivery side of a loop car facility for accumulating plate materials between a plurality of carrier rolls to a plate material transport speed. It is controlled to match the target value, and the target value is corrected based on the plate material tension detected on the exit side of the loop car facility and the set plate material tension, and the torque reference is calculated using this value. Calculated, when controlling the plate tension by controlling the torque of the plate material transport mechanism using this torque reference, when the plate material to the loop car equipment entrance side conveyance speed or entrance side conveyance speed target value and exit side conveyance speed or Based on the delivery-side transport speed target value, the plate material transport speed between the carrier rolls and the rotation speed of each carrier roll are calculated, and the plate material transport speed is calculated. And, based on the rotation speed of each carrier roll, the plate material weight and the carrier roll inertia moment, the tension added component due to the inertia of the plate member and the carrier roll itself is calculated, and based on this tension added component, the tension fluctuation is suppressed as described above. A tension control method for continuous steel plate processing equipment, characterized by correcting a torque standard. 2. A tension control device for a continuous steel plate processing facility equipped with a plate material transport mechanism for continuously transporting plate material from a delivery side of a loop car facility for retaining plate material between a plurality of carrier rolls to a plate material transport speed. It is controlled to match the target value, and the target value is corrected based on the plate material tension detected on the exit side of the loop car facility and the set plate material tension, and the torque reference is calculated using this value. A torque control system that calculates and torque-controls the plate material transport mechanism using this torque reference, and an input side transfer speed or an input side transfer speed target value and an output side transfer speed or an output side transfer speed target of the plate material with respect to the loop car facility. Carrier roll speed calculation means for calculating the plate material transport speed on the carrier roll and the rotation speed of each carrier roll based on the value; Based on the plate material transport speed calculated by the roll speed calculation means, the rotation speed of each carrier roll, the plate material weight, and the carrier roll moment of inertia,
Continuous steel sheet processing facility characterized by being provided with a tension variation suppressing means for calculating a tension added amount due to inertia of the plate material and the carrier roll itself and correcting the torque reference obtained by the torque control system by the tension added amount. Tension control device. 3. A tension control method for a continuous steel plate processing facility equipped with a plate material transport mechanism for continuously transporting a plate material from a delivery side of a loop car facility for accumulating the plate material between a plurality of carrier rolls to a plate material transport speed. It is controlled to match the target value, and the target value is corrected based on the plate material tension detected on the exit side of the loop car facility and the set plate material tension, and the torque reference is calculated using this value. Calculated, when controlling the plate material tension by controlling the torque of the plate material conveying mechanism using this torque reference, when the plate material to the loop car equipment entrance side conveyance speed or entrance side conveyance speed target value and exit side conveyance speed or Calculate the number of rotations of the carrier roll in the same direction as the plate material transport direction based on the delivery-side transport speed target value, and rotate in the same direction as the plate material transport direction. Calculate the tension added component that is the bend loss generated in the carrier roll based on the number and the plate thickness and plate width of the plate material and the carrier roll radius, and based on this tension added component, to suppress the tension fluctuation. A method for controlling tension in a continuous steel sheet processing facility, which comprises correcting the torque standard. 4. A tension control device for a continuous steel plate processing facility equipped with a plate material transport mechanism for continuously transporting plate material from a delivery side of a loop car facility for accumulating plate materials between a plurality of carrier rolls to a plate material transport speed. It is controlled to match the target value, and the target value is corrected based on the plate material tension detected on the exit side of the loop car facility and the set plate material tension, and the torque reference is calculated using this value. A torque control system that calculates and torque-controls the plate material transport mechanism using this torque reference, and an input side transfer speed or an input side transfer speed target value and an output side transfer speed or an output side transfer speed target of the plate material with respect to the loop car facility. Based on the value, the carrier roll direction determining means for calculating the number of the carrier roll rotating in the same direction as the plate material conveying direction, in the same direction as the plate material conveying direction The tension added component, which is the bend loss generated in the carrier roll, is calculated based on the number of rotating members, the plate thickness and the plate width of the plate material, and the carrier roll radius, and the torque obtained by the torque control system by the tension added component. A tension control device for continuous steel plate processing equipment, comprising: a tension fluctuation suppressing means for correcting a reference.