JPH0532134B2

JPH0532134B2 -

Info

Publication number: JPH0532134B2
Application number: JP60117946A
Authority: JP
Inventors: Kazuo Takebe
Original assignee: Nisshin Steel Co Ltd
Current assignee: Nippon Steel Nisshin Co Ltd
Priority date: 1985-05-31
Filing date: 1985-05-31
Publication date: 1993-05-14
Also published as: JPS61276717A

Description

[Brief explanation of the drawing]

第１図は本発明の制御方法を適用したダブルル
ーパ方式の設備の構成を示す図、第２図はその制
御のためのブロツク図、第３図は従来のダブルル
ーパ方式の設備の構成を示す図である。Ａ……横ルーパ、Ｂ……縦ルーパ、１，２……
コイル、３，４……巻戻し装置、３ａ，４ａ……
駆動モータ、５……鋼帯、６……溶接装置、７，
８……ブライドルローラ、７ａ，８ａ……駆動モ
ータ、９……圧延装置、１０，１１……固定ロー
ラ、１２，１３……移動ローラ、１４，１５……
テンシヨンローラ、１６……ロツド、１７……巻
取り装置、１７ａ……駆動モータ、１８……ワイ
ヤ、１９，２０……ブライドルローラ、１９ａ，
２０ａ……駆動モータ、２１，２２……上側移動
ローラ、２３〜２５……下側移動ローラ、２６…
…固定ローラ、２７……巻取り装置、２７ａ……
駆動モータ、２８……ワイヤ、２９……横ループ
長検出器、３０……縦ループ長検出器、３１……
速度検出器、３２……速度検出器。 Figure 1 is a diagram showing the configuration of double looper type equipment to which the control method of the present invention is applied, Figure 2 is a block diagram for its control, and Figure 3 is a diagram showing the configuration of conventional double looper type equipment. be. A...Horizontal looper, B...Vertical looper, 1, 2...
Coil, 3, 4... Rewinding device, 3a, 4a...
Drive motor, 5... steel strip, 6... welding device, 7,
8... Bridle roller, 7a, 8a... Drive motor, 9... Rolling device, 10, 11... Fixed roller, 12, 13... Moving roller, 14, 15...
Tension roller, 16... Rod, 17... Winding device, 17a... Drive motor, 18... Wire, 19, 20... Bridle roller, 19a,
20a... Drive motor, 21, 22... Upper moving roller, 23-25... Lower moving roller, 26...
...Fixed roller, 27... Winding device, 27a...
Drive motor, 28...Wire, 29...Horizontal loop length detector, 30...Vertical loop length detector, 31...
Speed detector, 32...Speed detector.

Claims

[Claims] 1. A first looper and a second looper are successively provided in the middle of a continuous operation line for steel strips, a first bridle roller is provided on the entry side of the first looper, and a first bridle roller is provided on the entry side of the first looper. In a double looper in which a second bridle roller is provided between the looper and the second looper, the dispensing or driving speed of each of the two loopers is simultaneously controlled according to the ratio of the effective loop length of each of the two loopers. A method for controlling a double looper, characterized in that: 2. The speed of the second bridle roller is controlled from the supply speed of the first bridle roller and the supply speed of the exit side of the second looper, and the speed of the second bridle roller is controlled according to the ratio of the effective loop length. 2. The method of controlling a double looper according to claim 1, wherein the speed of said payout or push-in is controlled. 3. The speed control command for the second bridle roller includes a correction factor based on a deviation obtained by comparing the current loop length of each of the two loopers with respect to the effective loop length of each of the two loopers. A method for controlling a double looper according to claim 2. [Scope of Claims] [Industrial Application Field] The present invention relates to a method of controlling a double looper for continuously supplying steel strip to continuous annealing equipment, continuous rolling equipment, etc. without interruption. [Prior art] In continuous operation lines such as continuous steel strip annealing equipment and continuous rolling equipment, a looper is installed after the steel strip connection equipment in order to prevent supply interruptions due to steel strip connection work such as welding. The steel strip can be stored in a loop. The accumulation loop amount (accumulation loop length) is determined by the speed of annealing, rolling, etc. (line speed) and the time required to connect the steel strips.The higher the line speed and the longer the connection time, the greater the loop amount. need to do more. If an attempt is made to improve the throughput of annealing, rolling, etc. or the quality of the connection parts, the amount of loops will need to be increased, which will necessitate the installation of additional loopers. Therefore, in such cases, a double looper method is adopted in which a new looper is installed in an empty space in the factory and is connected to the existing looper. Furthermore, this double-loop method is not limited to the above-mentioned cases; even in the case of a newly constructed continuous operation line, the double-loop method can be used to effectively utilize spaces above ground or underground in a three-dimensional manner to control the length of the line, its building, etc. This method is adopted because it shortens the time required and inevitably reduces the amount of capital investment. FIG. 3 shows one configuration of such double looper type equipment, and shows an example of application to a continuous tandem rolling operation line. Reference numerals 1 and 2 indicate coils of steel strips to be rolled in sequence, which are set in a first unwinding device 3 and a second unwinding device 4, respectively; in this example, the steel strips from the first unwinding device 3 are rolled. 5 is fed out via a welding device 6. The steel strip 5 from this welding device 6 is then used as a bridle roller (feed speed adjusting roller).
7 and 8, the loop length is appropriately accumulated by the horizontal looper A and the vertical looper B, and then supplied to the rolling device 9. 3a and 4a are drive motors for the first and second rewinding devices 3 and 4, respectively, and 7a and 8a are drive motors for the bridle rollers 6 and 7, respectively. The horizontal looper A includes fixed rollers 10, 11, moving rollers 12, 13, and tension rollers 14, 15.
The loop length of the steel strip 5 is accumulated by . The moving rollers 12 and 13 are connected by a rod 16, and by driving a horizontal winding device 17 connected to the rod 16 by a wire 18 with a drive motor 17a, the moving rollers 12 and 13 move in the direction of arrows a and a'. The accumulation loop amount is adjusted by moving in the direction. Bridle rollers 19 and 20 are provided between the horizontal looper A and the vertical looper B, and the steel strip 5 is supplied to the vertical looper B via the bridle rollers 19 and 20. 19a and 20a are drive motors for the bridle rollers 19 and 20. The vertical looper B accumulates the loop length of the steel strip 5 by the upper moving rollers 21, 22, the lower moving rollers 23-25, and the fixed roller 26. teeth,
Due to the winding operation of the winding device 27, they move toward each other and away from each other. That is, by the wire 28 of the winding device 27, when the upper moving rollers 21 and 22 descend, the lower moving rollers 23 to 25 rise, and when the upper moving rollers 21 and 22 rise, the lower moving roller 2
3 to 25 descend to adjust the storage loop amount. 27a is a drive motor for the winding device 27. The overall operation is as follows. That is,
When the steel strip 5 unwound from the coil 1 set in the unwinding device 3 runs out, the bridle rollers 7 and 8 stop and the feeding of the steel strip 5 is interrupted, and the steel strip of the coil 2 is placed at the end of the steel strip 5. The tip is welded by the welding device 6. During this connection work, first, the movable rollers 12 and 13 of the horizontal looper A sequentially move in the direction of arrow a, and the steel strips 5 that have been accumulated there are sequentially paid out (feed out). When the moving rollers 12 and 13 move to the minimum accumulation position (the position indicated by the imaginary line in FIG. 3), the bridle rollers 19 and 20 stop, and the upper moving rollers 21 and 22 of the vertical looper B stop. The lower moving rollers 23 to 25 come close to each other, and the steel strip 5 accumulated there is discharged. In this way, even if welding work is required to connect the steel strips, part or all of the length of the steel strips 5 accumulated in the horizontal looper A and the vertical looper B can be discharged and rolled. The rolling operation in the device 9 continues without interruption. When the welding work is completed, the upper moving rollers 21, 22 of the vertical looper B are first moved in order to quickly drive (take in) the steel strip into both the loopers A, B by the bridle rollers 7, 8, 19, 20. The lower moving rollers 23 to 25 are separated from each other, and the steel strip is accumulated in the vertical looper B. When the storage amount in the vertical looper B becomes full, the bridle rollers 19 and 20 are controlled to a speed that can maintain the storage amount, and then the moving rollers 12 and 13 of the horizontal looper A move in the direction of arrow a'. Steel strips are accumulated in the horizontal looper A. When the steel strip accumulation amount in the horizontal looper A becomes full, the bridle rollers 7 and 8 are controlled to a speed that can maintain the accumulated amount. This speed is a speed synchronized with the speed at which the steel strip enters the rolling device 9, and is the line speed. However, the double looper method explained above,
A control method is adopted in which the steel strips accumulated in both loopers A and B are discharged and the steel strips to be accumulated therein are driven in after one looper is finished. Therefore, the winding devices 17, 27 of the horizontal looper A and the vertical looper B operate at the maximum speed determined by the difference between the speed at which the steel strip enters the rolling device 9 and the speed of the bridle rollers 7, 8. drive motor 17a,
It is necessary to determine the capacity of 27a, which is quite large. Regarding the storage loop lengths in both loopers A and B, a protection loop length that is not normally used is provided to protect against abnormalities in loop control (protection against cutting of steel strips, etc.). This protection loop length corresponds to the distance the steel strip is fed from the speed of dispensing or driving in when an abnormality occurs to the time of stopping, and is proportional to the square of the speed. Therefore, increasing the speed requires increasing the protection loop length, which reduces the effective storage amount in the storage loop length. Furthermore, the higher the speed of driving in and paying out,
It is difficult to center the steel strip within the loop, and the tension within the loop also fluctuates greatly when the loop accelerates or decelerates. [Object of the Invention] The present invention has been made in view of the problems described above, and its purpose is to reduce the capacity of the drive motor of each looper and to shorten the loop length for protection. To provide a control method for a double looper in which the effective loop length can be increased by reducing the loop length, and furthermore, the tension fluctuation within the loop can be reduced and the centering of the steel strip can be improved. [Structure of the Invention] In order to achieve the above object, the present invention is configured to simultaneously control the discharging or driving speed of each of the two loopers according to the ratio of the effective loop lengths of each of the two loopers. Allowing the speed to decrease. [Examples] Examples of the present invention will be described below. 1st
The figure shows one embodiment, and the same parts as in FIG. 3 are given the same reference numerals. In this embodiment, the winding device 17 of the horizontal looper A is provided with a horizontal loop length (accumulation amount) detector 29, and the winding device 27 of the vertical looper B is also provided with a vertical loop length detector 30. A speed detector 32 is provided to detect the speed of the steel strip 5 on the entrance side of the rolling device 9. Here, if the entrance speed of the rolling device 9 is V _M and the speed command to the bridle rollers 7, 8 (given to the drive motors 7a, 8a) is V _E , then, for example, the speed V _M is constant and Also, the speed V _E changes depending on the state of push-in and pay-out. Now, let L _V be the effective loop length of the steel strip accumulated in the vertical looper B, let V _V be the driving speed there, and let L _H be the effective loop length of the steel strip accumulated in the horizontal looper A, and let the driving speed there be Let V _H be L _V /L _H = V _V /V _H (1) In the case of (1), the speed at each looper corresponds to the effective loop length of the corresponding looper. That is,
By increasing the speed of the longer effective loop length and lowering the speed of the shorter effective loop length, the steel strip can be driven into both loopers A and B at the same time until the end.
Therefore, the speed can be slowed down. Therefore, in order to satisfy equation (1), the bridle roller 19 for controlling both loopers A and B,
20 (given to the drive motors 19a, 20a) V ₂ is calculated from V _V = V _M − _{V 2} ...(2) V _H = V ₂ − V _E ...(3), V ₂ =V _E +V _M・L _H /L _V /1+L _H /L _V =V _E +k・V _M /1+k ...(4) Find by ∴k=L _H /L _V. k is a constant determined by the mechanical maximum length of the vertical and horizontal effective loop lengths. From the above, by configuring a speed control loop using the speed commands of V _M , V ₂ , and V _E , the ratio of the loop length of horizontal looper A and the loop length of vertical looper B can be kept constant, and Although it is possible to reduce the payout speed, in reality, errors occur due to various load fluctuations. Therefore, the current loop length of the horizontal looper A is determined by the vertical loop length detector 30 and the horizontal loop length detector 29.
_H , the loop length _V of the vertical looper B is detected, a speed correction command V ₂ ' is obtained by the following equation, and it is superimposed on the aforementioned speed command V ₂ to be used as the speed command for the bridle rollers 19 and 20. V ₂ ′=k′ ( _H /L _H − _V /L _V ) ...(5) k′ is the speed correction coefficient for ratio deviation. As a result of the above, the speed command for the bridle rollers 19 and 20 becomes "V ₂ +V ₂ '", and a speed control loop is configured with this as the target value. FIG. 2 shows this block, where 41 is an arithmetic circuit of equation (4), 42 is an arithmetic circuit of equation (5), 43 is an amplifier, and 44 is an arithmetic circuit of equation (5).
32 is a speed detector for the bridle roller drive motor 19a or 20a, from which a detected speed signal is fed back. FIG. 1 shows a state in which a speed detector 32 is installed on the bridle roller drive motor 19a. Here, any type of loop length detectors 29 and 30 can be used as long as the loop length can be detected, but in order to improve detection accuracy, digital type ones are preferable, and calculations and It is preferable to process correction signals and the like digitally. As a result of the above, it is possible to simultaneously pay out and push in at the ratio of the effective loop length of the double loop, and by making the sum of the speeds the same as each speed of the conventional double loop, it is possible to pay out and drive in the same way as before. becomes. The overall operation is performed as follows. That is, first, the bridle rollers 7 and 8 stop to connect the steel strip, and then in the horizontal looper A and the vertical looper B,
At the same time, the loop length begins to decrease so that its proportion to the effective loop length is the same. If the steel strip connection work is not completed before either the horizontal looper A or the vertical looper B reaches the minimum loop length, the rolling device 9 will stop.
Generally, the steel strip connection work is completed before then.
Then, upon completion of this, the loop driving begins. In addition, since speed correction control is performed so that the ratio of the loop lengths of both loopers A and B does not change, both vertical looper A and horizontal looper B reach the minimum loop length position almost simultaneously, and the effective loop length can be used effectively. In addition, in the above embodiment, the case where the loopers are vertical and horizontal has been explained, but the same control can be achieved even if two loopers are configured in the vertical direction or two in the horizontal direction.
There are no conditions for its composition. [Effects of the Invention] As described above, according to the present invention, it is possible to reduce the speed of discharging and driving the steel strip in each looper, and thus the capacity of the looper drive motor can be reduced to about half that of the conventional case. In addition, the protection loop length for protecting the machine when a control abnormality occurs can be shortened, and the effective loop length can be increased. Furthermore, the ratio of acceleration and deceleration in the looper can be lowered, tension fluctuations in the loop during dispensing and driving are reduced, and the centering of the steel strip in the loop is improved.