JPS61286021A - Process control device - Google Patents

Abstract

PURPOSE:To improve the quality of a strip by controlling the conveying speed of the strip according to a processing speed and the acceleration rate derived according to the strip quantity then replenishing or delivering the strip to a looper. CONSTITUTION:A looper position input device 10 and a gate circuit 14 are provided and a remaining loop quantity calculator 11 and an arithmetic unit 12 for the acceleration are disposed. The gate circuit 14 opens the gate thereof by the operation signal from an inlet side operation signal generator 9 and inputs the looper position detected by a looper position detector 6 to the device 10. The calculator 11 calculates the remaining strip quantity and outputs the same to the arithmetic unit 12. The arithmetic unit 12 derives the optimum acceleration rate on the inlet side from the processing speed of the detector 5 and controls the inlet side speed. The fluctuation of the strip tension is decreased by the above-mentioned method, by which the quality of the strip is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a process control device in a continuous annealing line or the like, and particularly to an acceleration control device 1 provided for operating an inlet settation. BACKGROUND OF THE INVENTION In process lines such as continuous annealing lines, strips are continuously fed to a central processing section in order to improve operating efficiency.

Therefore, on the entry side of the process line, the tail end of the preceding strip and the tip of the following strip are joined by means such as welding.
Following. During this follow-up, it is necessary to temporarily stop the tail end of the preceding strip, so the P# of the strip to the process processing section is fed out from the looper formed at the input side of the process line, and the strip is continuously processed. Feed the strip to the processing section.

Therefore, it is necessary to have a predetermined amount of strip in the looper in advance, and after following the preceding strip and the following strip, the subsequent strip is supplied to the looper at a speed faster than the process processing speed, and the strip lid is removed. It is necessary to replenish the louver with an appropriate amount of strips.

Figure 2 shows a conventional speed control device on the inlet side of a process line, (1) a speed reference generation circuit that generates a speed reference for the inlet section, (2) ri, an inlet speed generation circuit, and this circuit. The output speed of a motor that drives a roller (not shown) that conveys the input strip is controlled. (3) is the speed setting device, (4) is the acceleration setting device,
The speed reference signal M (υ) is the acceleration rate set in the acceleration setter (4) and generates a speed reference that reaches the speed set in the speed setter (3). (5) is the central processing A processing speed detector detects the process processing speed at the setup, (6) is a louver position detector, (7) If'
The i-synchronous control circuit receives input signals 8 from the speed reference generation circuit (1), processing speed detector (5), and louver position detector (6).
Based on the synchronous control signal (generated slowly, contact (8a),
(8b) is controlled ON and OFF.

Next, the operation will be explained.

In the figure, the speed reference generation circuit (1) is connected to the acceleration setter (
4) Accelerate according to the entrance section acceleration setting device rate setting set in 4), and achieve the speed set in the speed setting device (3)? It is something that is determined and occurs. This speed signal is an acceleration signal for replenishing the looper trip after following the following strip, and is supplied to the inlet speed generating circuit as an inlet speed reference via the contact (8b).

Further, the speed reference generation circuit (1) and the acceleration setter (4) If'i can be used not only to generate the speed reference signal as described above, but also to eliminate it. In this case, the acceleration setter (4) is regarded as a deceleration setter, and from the state of speed reference signal generation, the speed is determined so that the speed set in the speed setter (3) is reached, and the speed disappears. Acceleration setter (4) The circuit, timing, etc. that are considered to be the deceleration setter (B) do not directly relate to the present invention, so a description thereof will be omitted.

In a steady state when a constant stripping amount is formed at the louver KFfr, the process processing speed detected by the processing speed detector (5) is transferred to the inlet speed generating circuit (
2] and conveys the strip at the processing speed.

The above two speed signals supplied to the inlet speed generation circuit (2) are selectively controlled by a synchronous control circuit (ON-OFF control of contacts (8a) and (8b) by a synchronous control signal that generates force). That is, the looper position detector (6) is a detector attached to a mechanical device for strip accumulation installed at an intermediate position between the inlet section and the central processing section. The synchronous control circuit (7) detects the amount of stripping.The synchronous control circuit (7) detects the position detection amount of the louver position detector (6) and the speed reference generation circuit (1).
In order to maintain the louver at a constant position based on the input speed and processing speed of the processing speed detector (5), the synchronization control circuit (7) controls the input speed reference to be the same as the central speed reference.

Now, FIG. 3 shows a pattern of input side and process processing speeds that are continuously rotated in a conventional acceleration control device.

(31) is the processing speed, which is operated at a constant speed to ensure production volume. (32) is the entrance speed,
Section (a) is the entry side stop time, and during this stop time, the preceding coil and the succeeding coil are welded by the welding machine of the entry side section. In the figure, the shaded area (S) is the variation in the amount of strip that occurs due to the speed difference between the input side and the processing section, and the amount of strip that decreased in section (b) is the area (
The louver is replenished by making the entry speed (32) higher than the processing speed (32) in Q).

17) The mechanical device for dispensing and storing the stop amount that varies between sections (b) and (c) is a louver.

[Problem that the invention seeks to solve]

Since the conventional acceleration control device is configured as described above, when the strip is inserted, it accelerates at a predetermined acceleration rate regardless of the amount of remaining louver, and reaches point A (as shown in Fig. 3). There was a drawback that a large amount of tension fluctuation occurred due to speed change at point B (acceleration light r) at point B (acceleration light r), which caused a tension change #J to the subsequent processing section and adversely affected the product.

This invention was made in order to eliminate and alleviate the drawbacks of the conventional devices as described above, and provides an acceleration control device that can suppress tension fluctuations in the strip and alleviate tension fluctuations to post-processing equipment by #J. This is what we provide.

[Means for solving problems]

The acceleration control device according to the present invention derives an acceleration rate for replenishing or dispensing strips to the looper in accordance with the process processing speed and the amount of strips formed on the louver.

[Effect]

The acceleration control device according to the present invention controls the conveying speed of the strip in accordance with the acceleration rate derived according to the process processing speed and the amount of strip, and replenishes or dispenses the strip.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) to (8) have the same structure as the conventional case shown in FIG. 2, so the explanation thereof will be omitted.

(9) is an entry-side operation signal generator, and (10) is a looper position input device that inputs a louver position signal detected when the entry-side operation signal generator (9) generates a signal.

Based on this position signal, the remaining loop amount and loop amount calculator (
11) is calculated.

(12) is an acceleration coal car calculation device that derives an acceleration rate based on the remaining loop amount and process processing speed, and (13) is an output device that sets the acceleration rate derived by this acceleration coal car calculation device to the acceleration setting device (4). , (14) is a gate circuit.

Next, the operation will be explained.

FIG. 4 shows the speed pattern of this invention.

(41) is the processing speed, (2) is the entrance speed, the solid line is the entrance speed of this invention, and the two-dot chain line is the conventional entrance speed. In the figure, the shaded area (81) is the strip length required to accelerate the entry section to mid-speed.

In FIG. 1, the gate circuit (14) opens its gate in response to the operation signal from the inlet operation signal generator (9), and the louver position input device t (10) detects the looper position 1 detected by the louver position detector (6). ). Remaining loop amount calculation unit (il) ri Mill (position input device it) A signal is input from the looper position (10) to calculate the loop amount of the remaining strip and output to the accelerating coal car calculation unit (12). The acceleration calculator (12) calculates the cutting loop amount obtained from the cutting loop amount calculator (11) and the processing speed detector (
Based on the process processing speed detected in step 5), calculations to be described later are performed to derive the optimum acceleration rate on the entry side. The acceleration rate derived by the acceleration magic calculator [12] is output to the output device (13)
It is set in the acceleration setting device (4) via the inlet and is used to control the entrance speed.

Hereinafter, a method of calculating the acceleration rate derived by the acceleration magic calculator (12) will be described.

Now, assuming that the processing speed in the process section is 6v and the entrance side acceleration is αl, the strip length 81 required at this time can be found by equation (1).

Here, if the required strip length Sl is the remaining loop amount l, and the acceleration α1 is transformed into the ice equation, 2 is obtained.
...(2) is obtained. This α
l is the optimum acceleration rate.

In addition, the tension fluctuation is expressed by the tension difference per unit time,
It is shown by the following relational expression.

ΔT π=ΔH×K ・Song・ (3) Here, ΔT: Tension difference ΔH: Speed difference K; Constant, that is, a small speed difference ΔV means that the tension fluctuation is small, and the acceleration rate is It is clear that the present invention, which slows down as much as possible depending on the remaining loop amount, has an advantage over conventional devices.

In the above example, an acceleration control device for the entry section was shown, but for the entry section that causes the succeeding machine to follow the preceding material, a process provided to make the leading material follow the preceding material. In the outlet section of the line, the following method, principle of operation, and configuration equipment are exactly the same as in the inlet section, so if this control device is added to the acceleration control device of the outlet section, the stripping can be performed in the same way. The tension fluctuation is alleviated.

Regarding the adding method for acceleration control of the exit section, in the above explanation, 7 "input side" should be read as "exit side", and the amount of cutting loops can be determined by the maximum loop amount that can be accumulated in the loop and the current amount. It can be thought of as the loop amount that is the difference between the loop amount and the loop amount.

〔Effect of the invention〕

As described above, according to the present invention, the process processing speed and
An acceleration rate is derived according to the amount of strip formed on the looper, and the rate of replenishing or dispensing strips to the looper is controlled by the acceleration rate, so the acceleration rate is slower than the conventional acceleration rate, and strip tension fluctuations are reduced. can be reduced and the quality of the strip itself can be improved.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of an acceleration control device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing the configuration of a conventional acceleration control device, and FIG. 3 is a circuit diagram showing the configuration of a conventional acceleration control device. Figure 4 shows a speed pattern diagram of equipment operated by an acceleration control device according to an embodiment of the present invention. In the figure, (1) is a speed reference generation circuit, (2) is an inlet speed generation circuit, (3) is a speed setter, (4) is a tri acceleration setter, (5) is a t/i processing speed detector, ( 6) is a looper position detector, (7) is a synchronous control circuit, (11) is a remaining looper amount calculator, and (12) is an acceleration hand calculator. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] By discharging or storing the looper formed on the inlet or outlet side of the central processing section, the processing speed of the central processing section is maintained while the material on the inlet or outlet side of the looper is stopped, and then the process speed is maintained. In the process control device that returns the looper amount to the looper amount, the acceleration rate for storing or discharging the strip to the looper and returning the strip to the original looper amount is determined based on the process processing speed of the central processing section and the amount of strip formed in the looper. A process control device characterized in that the accumulating or dispensing speed for returning to the original looper amount is controlled by the acceleration rate.