JPS5819575B2 - Automatic central speed control method in continuous strip processing line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for pickling in the center of the line, such as a continuous pickling line, in which strips or linear workpieces are successively connected and surface treated continuously. This invention relates to a method for automatically calculating and controlling processing speed in a tank.

In general, equipment such as continuous pickling lines that sequentially and continuously process strip or linear workpiece materials (hereinafter referred to as strips) are divided into operation sections: entry, center, and exit. Normally, the input side is used to unwind the strip during processing, remove ash, pass through the tip of the next IJ tube, connect both strips, etc., and the output side is used to complete winding to the desired length. There is downtime when the line is stopped for dividing strips, taking test materials, changing sizes, threading the next coil, etc.

On the other hand, the central part is usually equipment where fluctuations in line speed are undesirable, such as pickling tanks, heat treatment furnaces, rolling mills, etc. Therefore, from the viewpoint of quality and operating costs, speed fluctuations and line stoppages are avoided as much as possible and the equipment is operated at a stable speed. This is strongly requested.

For this reason, a strip storage device is installed on either or both of the input and output sides so that even if the line is stopped at the input or output side, the central section will not be stopped. Is it common?

Normally, the stripping speed in the center of the line is
The operator should consider the calculation speed based on the length of the J-tube, the working conditions on the input side, the number of divisions on the output side, various tasks such as changing the size of the IJ tube, and the amount of IJ tubes stored on the input and output sides. has been decided and set.

However, as lines become larger, faster, and the variety of products diversified, operations that rely on the experience and intuition of operators gradually become unable to cope with this, and as a result, fluctuations in center speed increase and production efficiency declines. , sales losses have often occurred due to insufficient or excessive pickling.

In order to solve the above problems, the strip length of each coil in service is calculated from the coil unit weight, strip width and thickness, and the strip length is calculated based on the ideal working pattern on the line entry and exit sides. A method has also been proposed in which the central speed is set in advance using a calculated value, but in actual operation, work is not always carried out according to the ideal work pattern, and there may be disturbances in work on the entry and exit sides. Since line stoppages due to abnormalities often occur, this method of setting the speed in advance cannot adequately cope with changes that occur during actual operation.

In order to solve the operational and quality problems of slanting, the present invention has been developed to reduce the remaining length of coil strips on the inlet and outlet sides of the line, which change every moment, the stop time until the start of the next coil processing, and , the amount of strip stored on the output side, and is calculated and controlled in real time to minimize fluctuations in the central speed, thereby stabilizing the process, improving quality, and reducing the burden on workers. It is.

The details of the invention are explained below with reference to the figures of the embodiments.

FIG. 1 shows the layout of a continuous pickling line.

In the figure, a coil (trailing coil) 1 loaded into a payoff reel 2 for coil rewinding passes through a pinch roll leveler 3, and after cutting off the off-gauge part at the tip with a shear 4, it is transferred to a welding machine 5. and is connected to the tail end of the preceding coil.

After connection, the input side starts operating in response to a startup instruction, and the I-IJ tube of the coil 1 of the payoff reel 2 is fed into the input side loop calf at high speed.

This entry side loop calf is a storage device provided to compensate for the strip speed difference between the entry side and the center 8. When the entry side speed is higher than the center speed, the loop calf is located on the left side in the figure. Moving from the short end position towards the right long end position increases the amount of storage strip.

If the inlet speed is lower than the center speed, there will be movement in the opposite direction, reducing the storage strip volume.

The surface-treated strip passing through the pickling tank in the center 8 enters the exit loop car 9.

The loop car 9 operates similarly to the inlet loop carf and compensates for the difference in stripping speed between the center and the outlet.

The strip is sent to the exit side via an exit loop car 9, has both ends cut off by a side trimmer 10, and then wound onto a tension reel 13.

When the coil 14 reaches a predetermined length or weight during winding, it is cut into strips by the exit shear 12, and after winding is completed by a tension reel, it becomes a product.

Next, the cut tip is used as the tip of the next coil and is engaged with the next tension reel, and the operation is started again.

In the above equipment, on the entry side, after the preceding coil has been unwound, the tail end is cut and removed by the shear 4, and the subsequent coil is unwound from the payoff reel 2, and the tip is cut and removed by the shear 4 through the pinch roll leveler 3. A stop on the entry side for welding and connecting the leading end of the leading coil and the leading end of the trailing coil, and a high-speed operation after these operations are completed are repeated.

Similarly, on the exit side, stopping for changing the width of the side trimmer 10, cutting the strip by the exit shear 12, winding the strip around another tension reel 13, etc., and high-speed operation are repeated.

On the other hand, the center part is the part containing the pickling tank, and for reasons such as quality and production efficiency, it is required that the strip be fed as fast as possible and at a stable speed.

The present invention, in response to the demand for diagonal climbing, implements splitting of bamboo at a central speed using the above-mentioned equipment as follows.

■ Line speed control The following speed settings are made with the aim of increasing production capacity as much as possible and reducing center speed variation;

a Entrance speed a-1 Maximum speed of the equipment a-2 Sl-IJ knob If a limit is set on the maximum speed due to other circumstances, this speed limit a-3 Entrance loop car is at the long end (in the case of the right end mentioned above) is the center speed and the synchronous speed.

b Median speed b-1 Speed at which the incoming loop car reaches the short end (left end) just before the incoming trailing coil starts operating.

b-2 When the entrance loop car is at the short end, the speed is synchronous with the entrance speed.

b-3 Speed at which the exit loop car reaches the long end just before the next coil operation starts after exit splitting.

b-4 When the exit loop car is at the long end, the exit speed and synchronous speed.

When a limit is set on the maximum speed due to b-5 strip or other circumstances, this is the speed limit.

C Output speed c-1 Maximum speed of equipment c-2 Strip If a limit is set on the maximum speed due to other circumstances, this is the limit speed.

c-3 When the exit loop car is at the short end, the speed is synchronous with the center speed.

Among the above speeds, select the minimum speed for each of the entrance, center, and exit sides.

■ Determining the center speed Since the entrance and exit speeds are determined as above, the center speed is determined as follows.

a Remaining length of the current coil on the entry side constraint X m Entrance speed
VB rl/sec Standard stopping time on the entrance side from the end of the current coil to the start of ash removal coil operation T
B sec Time to complete rewinding of current coil jBs
ec entry side loop car position IB m entry side loop number nE center speed due to tea entry side constraints ■If cEmAec,
In order for the incoming loop car to become the short end just before the start of the next coil operation, VOE (tB + TB) - X + nB IE where t
B=X/VB Therefore, from the time the leading coil is removed until the trailing coil starts operating, X=
VOE = nE IE / TE = (2)b Output side constraint Remaining length until current coil division ym Output side speed VD m/sec Output side standard stop time from current coil exit side stop to next coil operation start TD sec Time until the current coil exit side stops tDSec Position ID from the short end of the exit side loop car m
Effective length of the exit loop LD m Number of exit loop threads nD Median speed due to exit side constraints V OD m/sec, then in order for the exit loop car to reach the long end just before the start of the next operation, VaD (tD + TD )-y+nD(LD ID) and tD=y/VゎTherefore, from the stop of the current coil output side to the start of operation of the trailing coil, y
=o as vcD=nD(Ll) ID)/TD'...
...(4) Median velocity ■c is the above calculation result vcE and V.

Set D to a small value.

Note that in the above formula, the terms related to line acceleration/deceleration are omitted to simplify the explanation, but in practice, accuracy will be improved if acceleration/deceleration is also taken into account in the calculation formula.

In addition, the standard exit stop time, TD sec, from the stop of the current coil exit side to the start of operation of the next coil, TD sec, is the time when the welded part starts from the front stop of the side trimmer when the side trimmer size is changed, and in other cases, the The timing at which the stoppage begins varies according to the work schedule, such as from the previous stoppage.

Therefore, the output standard stop time TD varies depending on the work schedule and is not a constant value.

The center speed during normal operation is set to the smaller value of either formula (1) or (3). According to equations (1) and (3), cE also occurs when one or both of the exit sides are stopped for inspection or for a short period of time for other reasons.
-QvcD-0, the center will automatically stop due to the control mechanism, which is not in accordance with the actual situation.

In order to prevent this problem, VOEVOD is used for temporary stops other than entry-side stop or exit-side stop due to completion of current coil processing.
Set as follows.

That is, for a short period of time tE' when the entrance speed is from vE to VB=
0, consider that TE has become TB +tE', and assume that.

However, in the case of a short-term stop, the expected time of tE' is unknown at the moment of the stop, so either the elapsed time from the start of the stop is processed continuously as tE', or every predetermined time ts elapses. The VOE is corrected as tE-n15 in steps.

In the case of exit side stop, equation (4) is similarly modified.

■ Modification of standard stopping time In the above calculation method, the standard stopping time on the entry and exit sides is determined in advance for each condition such as strip specifications, dimensions, and whether or not the size has changed. In actual work, this time varies considerably and is not always a constant value.

Therefore, the remaining time of the standard stop time is calculated in stages according to the work progress during the stop time, and the central speed is corrected.

In other words, the work during the standard downtime TE is as shown in Figure 2.
Divide into multiple m stages and set standard working time ti for each work division.
A completion signal is sent each time each work category is completed.

Assuming that the work up to section l has now been completed, the remaining standard stop time TEi is the remaining work from section i + 1 to m, so TB 1 = ti + 1 + ti + 2...
...+tm... (5) Therefore, when the preceding coil ash removal is stopped on the entry side later, depending on the work progress during the stop,
Every time one work on the entry side is completed, add T in equation (5) to TE in equation (2).
Substitute Ei to correct VcE.

Similarly, for the output side tD, TD in equation (4) is corrected.

■ In order to implement a control system that exceeds line speed control in real time, a rotating catfish detector 15 is installed on the payoff reel 2, a speedometer 16.20 and a length detector 1 are installed on the inlet and outlet priddle rolls 6 and 11.
7.21 is installed, a loop carf is installed, a loop car position detector 18.19 is installed at 9, and the remaining strip amount nBIB is
, nD (LD ID) is calculated and transmitted by the loop remaining amount meter 23.
．． 24. Work division meter 25.26 that divides standard stop work time and calculates remaining time 25.26, Speed meter 16.20, Transmitter 27.28 for length meter 17.21, Payoff reel rotation speed detector 15 transmitters 29, etc.,
30 charging coil standards, dimensions, for presetting
Weight, 31 product coil dimensions, unit weight, grade, and 3
The speeds are calculated and controlled by an arithmetic unit 22 that commands and controls the speeds of the entrance, center, and exit sides.

That is, in the arithmetic unit 22, the smaller calculated value of VOE or VOD is adopted as the center speed signal, and the drive motor of the center line is controlled based on that signal.

In this embodiment, drive motors (not shown) for the priddles BR and BR provided before and after the center line 8 are controlled by the above signal.

According to the speed control method using these devices, the entry and exit speeds related to the central speed amount are automatically calculated until the remaining amount in the entry and exit loop cars reaches the minimum value. can be controlled, and the fluctuations in the center speed can be minimized.

[Brief explanation of the drawing]

Fig. 1 is a layout diagram of the continuous pickling equipment, with the instruments necessary for the speed swinging leg added in a blank diagram, and Fig. 2 is an auxiliary diagram for descriptive explanation. 23.24...Loop remaining amount calculation, transmitter, 25
．． 26...Setting of stopped work divisions, calculation of remaining stop time at the end of work division i, transmitter,
27.28...S) IJ knob speed, passage amount calculation, transmitter, 29...Rotation speed transmitter, 30...
...Charging coil data presetter-131...
...Product coil data presetter-132...
...Limit speed presetter-122... Arithmetic control device.

Claims (1)

[Claims] 1. A line in which strips or linear workpieces are sequentially connected and processed continuously, and has processing devices on the input side, center, and output side, and further includes processing devices on the input side and the center. In equipment having a material storage device between the center and the outlet side, the first center line speed VCE is determined by the following formula, where: X: remaining length of the current coil E; entry speed TE; Standard downtime (standard stop time on the entry side from the current coil division to the start of the next coil operation) IE: Position from the short end of the entry loop car nE: Second center line speed determined by the entry side loop number formula VOD is calculated in real time, where: y: Remaining length until current coil division vD; Output side speed TD; Standard downtime (output side standard stop time from stopping the current coil output side to starting operation of the next coil) ID; Position from the short end of the exit loop car D; Effective length of the exit loop n I) +Number of exit loops Compare the above first center speed ■cE with the second center speed VOD and find that it is slow. 1. A method for automatically controlling a center speed in a continuous strip processing line, characterized in that the speed of the center line is set as a center speed signal, and a drive motor of the center line is controlled based on this center speed signal. 2. The scope of claims characterized in that the standard downtimes TE and TD are the remaining standard downtimes for each work performed during the same period of time divided into a plurality of work divisions, and each work division operation in progress is completed. 2. A central speed control method for a continuous sl-IJ tube processing pre-processing line as described in item 1.