JP3354865B2 - Looper speed control method and apparatus for strip material, and continuous processing line for strip material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for controlling a looper of a strip.

[0002]

2. Description of the Related Art Conventionally, in a process line for continuously processing a strip-shaped material such as a steel sheet, a speed difference generated during the handling of materials at an entrance and an exit of the line is absorbed to hinder the operation of the line. A looper is installed to prevent them from coming. The operation of the looper will be described with reference to FIG.

[0003] This figure shows a continuous annealing line.
The steel strip P paid out from the entrance payoff reel 1 passes through an entrance facility 2 such as a welding machine, a washing facility, and an entrance looper, and then is subjected to a continuous annealing furnace 3 having a heating zone, a uniform zone, and a cooling zone.
Through the exit-side looper 4, the steel sheet is continuously temper-rolled by the temper rolling mill 5, and then passed through the inspection looper 6 to the inspection room 7.
And then wound in a coil shape by the tension reel 8.

The inspection looper 6 has a function of storing the steel strip P when the steel strip P is temporarily stopped in order to inspect the surface of the tempered rolled steel strip P in the inspection room 7. . Normally, when the temper rolling mill 5 is stopped at the same time as the stop of the steel strip P, the roll is sunk into the surface of the steel strip P and a stop mark is generated, thereby deteriorating the quality. Therefore, in order to prevent the stop mark, it is necessary to continuously operate the temper rolling mill 5 at a low speed of 30 mpm, for example.
Is stored in the inspection looper 6.

Conventionally, the speed control of the inspection looper 6 is basically performed in three modes: a uniform speed control mode, a stop control mode, and a tuning control mode. That is, usually, the operation is performed by simultaneously accelerating or decelerating the passing speed on the entrance side and the exit side of the looper in the uniform speed control mode. When the steel strip P is stopped (inspection inspection) at the time of the inspection in the inspection room 7, the speed is reduced to near the minimum speed on both the entrance side and the exit side in the uniform speed operation, and then the stop control mode, that is, the exit side with the inspection room The steel strip P is stored by stopping only the threading. When the exit side passing plate is started again, the entrance side and exit side loopers are accelerated to a predetermined speed in a uniform speed operation, and then operated in the tuning control mode. After the completion of the tuning, the vehicle is operated in the normal speed uniform operation mode.

Here, a supplementary explanation of the tuning control mode is position control for moving the looper carriage to a preset looper position. That is, in the case of the looper in which the steel strip P is stored, the position of the carriage is larger than the normal set position, and it is necessary to return the position to the original set position by the next inspection. For this purpose, the looper is driven by giving a so-called looper differential speed that makes the exit side passing speed of the looper faster than the entrance side passing speed. Thus, the looper carriage can be returned to the set position.

[0007]

However, the above-described looper speed control has the following disadvantages.
That is, in the middle of performing the tuning control in a state where the exit side threading speed is faster than the entrance side threading speed, and the looper carriage is close to the tuning position, for example, in the temper rolling mill for passing the welding point of the steel strip. In the case where the rolling speed is extremely reduced (the welding point passing process), a request may be issued to reduce the looper entrance and exit sections. In that case,
The looper inlet side section, assuming that starts deceleration at the same timing as the looper exit side section, as shown in FIG. 6, the looper being the difference between the exit side passage plate velocity V _D and the inlet side communicating plate velocity V _E The speed ΔV is maintained until the deceleration is completed. Therefore, the carriage may move in a direction in which the carriage becomes shorter than the original tuning position L _S , and in some cases, the carriage may reach the emergency stop position L _ES, and may become inoperable.
A similar problem occurs when a stop check is required again during tuning control (FIG. 6). Further, in the inspection looper, an unscheduled acceleration request is rarely generated, but a similar problem may occur when an acceleration request is issued during the tuning control.

In order to prevent such a situation, the target position (end position) of the tuning control is set to the emergency stop position L.
May be set quite a margin from _ES, way to be a deceleration request in the control (acceleration request) is generated does not reach the emergency stop position L _ES deceleration (acceleration) of the end time are considered. However, in this method, since the amount of storage from the target position of the tuning control to the maximum storage position is reduced, the speed difference absorbing function as the original looper is reduced, and for example, the stop time required for inspection is reduced. And other problems arise. As a result, excessive capital investment is required, for example, the size of the looper must be increased.

It is an object of the present invention to provide a belt-shaped looper control method and apparatus which can solve the above-mentioned disadvantages of the prior art and can easily accelerate or decelerate during tuning control by relatively simple means. Aim.

[0010]

According to the present invention, when the looper of a strip is decelerated or accelerated from the state of tuning control, the difference between the inlet side passing speed and the outlet side passing speed of the looper is determined.
A looper speed control method for a strip-shaped material, wherein a deceleration or acceleration control is performed after calculating and controlling the looper differential speed to be zero . The difference between the inlet-side passing speed and the outlet-side passing speed of the looper is calculated, and the
As means for controlling the differential speed to be zero, it is preferable to decelerate the side with a higher passing speed or accelerate the side with a lower passing speed. In particular, in the deceleration control, it is preferable to decelerate the side where the passing speed is fast, and in the acceleration control it is preferable to accelerate the side where the passing speed is slow.

Further, the present invention is a speed control device for decelerating or accelerating a looper of a band material from a state of tuning control, wherein a speed difference detecting device detects a difference between an entrance side passing speed and an exit side passing speed. means, a speed difference control means for controlling decelerating or accelerating the speed difference so that a zero, the speed difference is
And a speed control means for decelerating or accelerating after reaching zero .

The looper is disposed downstream of the temper rolling mill in a continuous processing line equipped with a temper rolling mill, that is, such that the strip passes through the looper after passing through the temper rolling mill. Is preferred. Further, the present invention is a continuous strip band processing line having a temper rolling mill and a looper provided with the above-described strip-shaped looper speed control device. As shown in FIG. 5, this line may have upstream facilities such as annealing.

In any of the control method, the control device, and the continuous processing line of the present invention, it is not necessary to perform (or have means for) performing speed difference control for both acceleration and deceleration. Is usually only sufficient when using speed difference control at the time of deceleration, and only at uniform speed control at the time of acceleration. Further, it is preferable that the predetermined allowable value is substantially zero, that is, a speed difference that is small enough to cause no problem in the movement of the carriage.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to the drawings, in which the preferred embodiment is applied to the above-described conventional inspection looper 6 shown in FIG. FIG. 1 is a schematic diagram showing a main part of an embodiment of the present invention. In the figure, the same members as those of the conventional example are denoted by the same reference numerals.

In FIG. 1, reference numeral 11 denotes an input side motor for driving an input side roll 9a of the inspection looper 6, and an input side passing speed meter 12 such as a pulse transmitter is attached to the shaft thereof.
An output motor 13 drives the output roll 9b of the inspection looper 6. An output-side passing speed meter 14 such as a pulse transmitter is attached to the shaft of the motor. Reference numeral 15 denotes a looper speed control device.
As a function of the looper speed control device 15, a looper differential speed control mode is provided in addition to the conventional alignment speed control mode, stop control mode, and tuning control mode. The function of this looper differential speed control mode is as follows.
Is calculated using the input-side passing speed signal V _E and the output-side passing speed signal V _D respectively input from the input side motor 11 or the input side motor 11 or so that the looper differential speed ΔV becomes zero. The outlet motor 13 is controlled. A target speed command signal S _S , a stop command signal S _0, and a low speed setting signal _SL are set in the looper speed control device 15 via a setting device 16 such as a CRT.

The transport roll on the upper side of the looper moves up and down together with the looper carriage 17 to adjust the amount of band material to be stored. The looper carriage 17 can move between a short limit switch 18 for detecting a physical lower limit position (mechanical short) and a long limit switch 19 for detecting a physical upper limit position (mechanical long). The position is controlled by a carriage control device (not shown) according to the speed difference between the inlet-side passing speed and the outlet-side passing speed. In the carriage control device, an emergency stop position L _ES is set in advance with a margin more than the mechanical short limit, and a target position L _S of the tuning control is set in advance with a margin. Although an emergency stop position is also set on the long limit side, it has been omitted. L _ES and L _S are usually expressed as a ratio of the distance from the short end to the total length of the movable range (mechanical long end-mechanical short end: L _max ).

There is a method in which the upper transport roll is fixed and the lower transport roll is moved by a looper carriage. However, since the upper and lower sides are only reversed, the description is omitted. Hereinafter, the inspection looper 6 by the looper speed control device 15 of the present invention will be described.
Will be described based on the flow of FIG. First, in the inspection looper 6 steady state, the looper speed controller 15 assortment speed control mode is selected, assortment-speed operation by the target speed command signal S _S is performed. Incidentally, since (in the case of the temper rolling machine 5, for example 30 mpm) slow setting signal S _L is preset as a speed limit value, when the target speed command signal S _S is as below low speed setting signal S _L is from looper speed controller 15 slow setting signal S _L is outputted as the speed command value, always kept low speed setting signal S _L that is required for the inspection looper 6. Then, when the inspection request is issued and the steel strip P is inspected in the inspection room 7, the stop control mode is activated to stop the delivery roll 9b and stop the steel strip P. When the speed of the entrance roll 9a of the inspection looper 6 is set to the low speed setting signal S
_This is set by _L , and the storage of the steel strip P is started. After the inspection restart the exit side motor 13 is switched immediately to the tuning control mode and accelerates the thrust of the output side through plate velocity V _D. Exit side passage plate velocity V _D at this time is the target speed command signal S _S + thrust difference speed (see FIG. 3). Then, when the tuning is completed, the inspection looper 6 is operated in the steady state speed matching operation in the speed matching control mode. By the way, if a "deceleration request" is issued to the looper entrance section for some reason during the tuning control, the looper differential speed control mode calculates the looper differential speed ΔV,
The output side motor 13 is decelerated so that the looper differential speed ΔV becomes zero. In this case, if possible, the entrance motor 11 may be accelerated. When the looper differential speed ΔV is set to 0, the input side motor 11 and the output side motor 13 are simultaneously decelerated in accordance with the deceleration command value of “deceleration request”. As a result, FIG. 4 (in the case of the stop inspection)
Alternatively, the looper position does not move at the time of deceleration as shown in FIG. After the end of the deceleration operation, the vehicle immediately accelerates to the normal operating speed,
Thereafter, the mode is switched to the tuning control mode again to restart the tuning control, and when the tuning is completed, the mode is switched to the alignment speed control mode.

In the above example, the case where a "deceleration request" is issued during the tuning control has been described.
It goes without saying that the same can be applied to the case where is issued. The present invention, like the illustrated inspection looper,
A looper having substantially equal acceleration / deceleration performances on the entrance side and the exit side, and having a relatively small storage capacity (even in operation near the minimum speed, a stoppage time on one side is about 5 minutes or less);
The present invention is suitable for a looper having many controls for simultaneously performing acceleration and deceleration on the entrance side and the exit side. For example, even when an inspection room is provided via a looper upstream of the temper rolling mill for the purpose of inspecting the surface of the strip material before the temper rolling, the synchronous target position of the looper is closer to the longest side (that is, the strip material). However, the present invention can be applied without any problem.

Of course, when accelerating or decelerating on one side, the other side is in principle operated at a constant speed by a looper (for example, FIG. 5).
The exit looper 4 and the entrance looper included in the entrance facility 2 in the continuous annealing line shown in FIG.
In the case where simultaneous acceleration and deceleration on the exit side is required, application of the present invention is not prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention was applied to an inspection looper for a line of a continuous annealing facility constructed as shown in FIG. The effective length of the inspection looper is 90m, the acceleration / deceleration rate of the entrance and exit sections of the looper is 30mpm / sec, the maximum speed is 600mpm, and the difference between the entrance and exit plate speed is 100mpm at the maximum. In addition, when the mechanical limit of the inspection looper is set to 0% and the mechanical limit is set to 100%, if the tuning position is set to 0%, the stop time for the inspection in the inspection room can be secured 3 minutes. .

Therefore, the looper is set to 350 mpm in the uniform speed control mode.
In driving, when examining the steel strip in the laboratory, it slowed slow setting signal S _L of the inlet-side through plate speed 30 mpm (temper speed of the mill same 30 mpm). After the inspection was completed, the tuning control was performed in the tuning control mode with the inlet-side passing speed at 350 mpm and the outlet-side passing speed at 450 mpm. During the control, the temper rolling mill was decelerated due to the welding point passing process, so a "demand request" of 30 mpm was issued.

Then, in order to eliminate the looper differential speed ΔV calculated by applying the looper differential speed control mode of the present invention; 100 mpm, the outlet side passing speed is reduced to 350 mpm and the looper differential speed ΔV is reduced. Then, the vehicle was decelerated to 30 mpm in the uniform speed control mode. After 0.3 minutes, the request for deceleration was resolved. After accelerating again, tuning control was performed and the looper position was returned to the set value.

In the conventional example, since the looper differential speed ΔV cannot be set to 0, the looper moves to the shortest emergency and the operation becomes impossible. In order to prevent this, it is necessary to set the looper tuning position to, for example, 17%. Therefore, as described above, the handy that the ability of the looper cannot be used effectively occurs.

[0024]

As described above, according to the present invention,
It has the following excellent effects. (1) Even if a deceleration request is issued during tuning control, the looper differential speed is reduced to zero before deceleration control is performed. Improvements and savings in maintenance costs are possible. (2) Even if the tuning position of the looper is set to, for example, 0% near the mechanical movement limit, the looper does not reach the extreme limit, and the effective length of the looper is used from the mechanical short limit to the long limit. Therefore, generation of stop marks in the temper rolling mill can be suppressed, and the quality of the steel strip can be improved. (3) Since the time required for the looper to move when decelerating at the entrance / exit section of the looper is shortened, the time required for the tension change of the steel strip is shortened, and the meandering of the steel strip in the looper can be prevented. It is possible to improve the yield of the belt.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a main part of an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a control procedure by a looper speed control device of the present invention.

FIG. 3 is a characteristic diagram showing a relationship between a looper position deviation and a drive difference speed.

FIG. 4 is a characteristic diagram showing an operation state when a stop test is performed during tuning control when the present invention is applied.

FIG. 5 is a schematic view showing a conventional example of a continuous annealing line.

FIG. 6 is a characteristic diagram showing an operation state when a stop test is performed during the conventional tuning control.

FIG. 7 is a characteristic diagram illustrating an operation state when a welding point passing process is performed during tuning control when the present invention is applied.

FIG. 8 is a characteristic diagram showing an operation state when performing a welding point passing process during the conventional tuning control.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Payoff reel 2 Inlet equipment 3 Continuous annealing furnace 4 Outgoing looper 5 Temper rolling mill 6 Inspection looper 7 Inspection room 8 Tension reel 9a Incoming roll 9b Outgoing roll 11 Incoming motor 12 Incoming side sheet speed meter 13 Outgoing side Motor 14 Exit side threading speed meter 15 Looper speed controller 16 Setting device 17 Looper carriage 18 Short limit switch 19 Long limit switch P Steel strip L _S Tuning position L _ES Emergency stop position S _S Target speed command signal S ₀ Stop Command signal S _L Low speed setting signal ΔV Looper differential speed V _D Outgoing side passing speed V _E Inlet side passing speed

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Claims (5)

(57) [Claims] When a deceleration or acceleration control is performed on a looper of a band-shaped material from a tuning control state, a difference between an entrance side passing speed and an exit side passing speed of the looper is calculated, and the looper differential speed is determined.
A looper speed control method for a strip-shaped material, wherein the deceleration or acceleration control is performed after the control is made to be zero . 2. A difference between an entrance-side passing speed and an exit-side passing speed of the looper is calculated so that the looper differential speed becomes zero.
As a means for controlling, the side where the threading speed is fast is decelerated,
2. The method according to claim 1, further comprising accelerating a side having a lower passing speed. 3. A speed control device for decelerating or accelerating a band-shaped looper from a state of tuning control, wherein the speed difference detecting means detects a difference between an entrance-side passing speed and an exit-side passing speed.
Strip material and having a speed difference control means for controlling the deceleration or acceleration to the speed difference so that a zero, and a speed control means for the reduction or acceleration after the speed difference reaches zero Looper speed control device. 4. A looper speed control device for a strip-shaped material according to claim 3, wherein said looper is disposed downstream of the temper rolling mill in a continuous processing line having a temper rolling mill. . 5. A continuous strip line processing line having a temper rolling mill and a looper provided with the looper speed control device according to claim 3.