JPS6338201Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a meandering correction device suitable for metal strip processing lines, particularly low speed lines.

In a metal strip processing line, it is desirable (in some lines this is an essential requirement) that the center of the metal strip to be processed and the center of the processing line pass coincidentally. The deviation of the center of the metal strip from the center of the line is called meandering, and various meandering correction devices are already known to correct this.

One example is Japanese Patent Application Laid-Open No. 19248/1983. The meandering correction device for the metal strip processing line described in this publication includes a detector that detects the lateral movement of the side line of the metal strip, and a signal from the detector that detects the meandering, and inputs the meandering correction device to a first time limit switch that outputs a detection signal when the time interval from the input of the meandering detection signal is greater than a preset interval; It has a second time limit switch that outputs an output, and a cylinder that is operated by a signal from the second time limit switch. However, the device disclosed in Japanese Patent Application Laid-Open No. 57-19248 detects only one side surface, and the detection is either on or off, and the signals in non-meandering areas cannot be distinguished, resulting in a high activation frequency. There were times when the meandering correction did not go as planned.

By the way, in a high-speed line, the speed of meandering eccentricity is fast, and in order to quickly correct this, it is necessary to control continuously from the beginning. On the contrary
It has been found that continuous control is not necessary in low-speed lines such as 100 m/min or less, and that control at certain intervals is sufficient to achieve the purpose.
This idea was made with this point in mind.

Embodiments of the present invention will be described based on the drawings.

FIG. 1 is a perspective view showing the coil unwinding state of the metal band. In the figure, 1 is a metal strip, 2 is an unwinding shaft of the metal strip 1, 3 is a drive device for the unwinding shaft 2, 4a and 4b are floodlights arranged on both sides of the metal strip 1, and 5a and 5b are floodlights 4a and 4b. The light receivers are placed opposite each other, and a metal band 1 is located between them.

The unwound metal strip is fed into the line, and thereafter the metal strip is pulled by the machine on the line and the unwinding shaft is rotated. By applying the brake to the drive device 3, tension is generated in the metal band 1. If the metal strip 1 meanders left and right in such a state, the meandering (center deviation) can be corrected by moving the unwinding shaft 2 in the directions of arrows A and B. The drive device 3 and the unwinding shaft 2 are collectively referred to as an unwinding machine 10, and are configured so that the unwinding machine 10 is displaced in directions A and B with the displacement of a piston 14 in a hydraulic cylinder 13 (Fig. 2). reference).

FIG. 2 is a system diagram showing an embodiment of the present invention,
Numerals 6a and 6b are photoelectric control units to which projectors 4a and 4b and receivers 5a and 5b are respectively connected. 7a and 7b are first on/off timers, which are on during time P and off during time Q, and repeat their operation every cycle time T (however, T=P+Q);
a and 6b, respectively (see Fig. 3). Reference numerals 8a and 8b are second on/off timers, which are turned on during time p and turned off during time q, and repeat their operation every cycle time t (where t=p+q). Note that the first on/off timer 7a,
On time P of 7b and second on/off timer 8a, 8
The on-time p of b can be arbitrarily selected and set. Of course, the one-cycle times T and t can also be freely selected and set. Further, the second on-off timers 8a and 8b are each connected to the first on-off timer 7.
a and 7b, respectively. 9a, 9b
are opening/closing contacts, which are connected to the second on/off timers 8a and 8b, respectively.
The photoelectric control unit 6 is connected via a and 8b.
Control power sources a and 6b are connected to switching contacts 9a and 9b. When the switching contacts 9a and 9b are turned on, the solenoids 11a and 11b are excited. When the solenoid 11a is excited, the hydraulic switching solenoid valve 12 is moved to the right, and the chamber 1 of the hydraulic cylinder 13 is opened.
Pressure oil is sent to 3b to displace the piston 14 to the A side. Similarly, when the solenoid 11a is excited, the hydraulic switching solenoid valve 12 is moved to the left, and the hydraulic cylinder 1
Pressure oil is sent to the chamber 13a of No. 3 to displace the piston 14 to the B side. Photoelectric control unit 6a
The light emitting power from the emitter 4a and the light receiver 5a
The light receiving power from the photoelectric control unit 6
A is connected to transmit the control power from the photoelectric control unit 6 to the first on/off timer 7a. As a result, the light emitting power transmitted from the photoelectric control unit 6a to the light projector 4a causes light to be emitted from the light projector 4a toward the light receiver 5a, and if there is no metal band 1 between the light projector 4a and the light receiver 5a, the light emitter The light receiver 5a receives the light emitted from the light source, and the received light power is sent to the photoelectric control unit 6a, and this received light power is used as a control power source by a converter built in the photoelectric control unit 6a, and is used for the first on/off operation. The signal is sent to timer 7a. In other words, when the metal strip 1 is shifted toward the A side in FIG. 2, the metal strip 1 disappears between the emitter 4b and the receiver 5b, so light is received, and the photoelectric control unit 6b becomes a control power source and turns the first on/off. It is sent to timer 7b.

When the control power supply from the photoelectric control unit 6b enters the first on/off timer 7b, it passes through the on-time period P, and is shut off otherwise. The same applies to the second on/off timer 8b.

FIG. 3 illustrates this operating state. The vertical axis represents each timer and the horizontal axis represents the passage of time.The operation will be explained with reference to this diagram.

The illustrated timer setting is the first on/off timer 7a.
and one cycle time T and t of the second on/off timer 8a
is the same, and the on-time set value p of the second on-off timer 8a is set smaller than the on-time set value P of the first on-off timer 7a.

In this case, we have shown the case where the one cycle time of P and p is the same, but they do not necessarily have to be the same and usually T>t
It is necessary to set the relationship P>p.

At first, the metal band 1 is biased toward the B side and light is received on the A side, and when the time period P of the first on-off timer 7a and the on time period P of the second on-off timer 8a overlap, the control power supply switch is opened and closed. 9a, the opening/closing contact 9a is closed, the solenoid 11a is energized, the hydraulic pressure switching solenoid valve 12 is moved to the right, that is, it is pulled and displaced toward the solenoid 11a, and the pressure oil is transferred to the oil chamber 13.
At the same time, the oil in the oil chamber 13a is discharged, the piston 14 is pushed out, and the unwinding machine 10 is displaced to the A side. As the unwinding machine 10 moves to the A side, the metal band also moves to the A side, and the position of the metal band 1, which was biased to the B side, is corrected. In Fig. 3, it means that it did not return to normal after one correction, but returned to approximately the center (dead zone) after three corrections. After that, metal band 1 was in the center for a while, and then shifted to side A, and then
The same operation as on the A side described above is repeated on the A side, and 1
This shows that it has returned to the center due to the control of the rotation. Incidentally, if the positions of the left and right ends of the metal band are equal to the positions of the light projector and the light receiver, left and right detection signals will always be output, making operation impossible. Therefore, by setting the emitter and receiver closer to the center than the side edges of the metal strip, as shown by C and C' in Figure 2,
The lengths of C and C' become the dead zone. If the meandering tolerance of the metal strip is ±20 mm, it can be satisfied by setting C and C' slightly smaller than that (by the amount of play in the correction operation).

While constantly repeating the above, the metal band 1
It operates in order to keep it in the center. Next, an experimental example will be given where the method is applied to a certain processing line.

Experimental example Experimental line...Continuous polishing line Line speed...30~50m/min Metal strip to be processed...2.3mm thickness x 1020mm width Setting values for T and t...5 seconds Setting value for P...3 seconds p Setting value: 1 second Dead zone C, C': 2 mm each In other words, the deviation of the metal strip is detected every 5 seconds, and if necessary, the solenoid valve is operated for 1 second to correct the position.

As a result, the maximum correction frequency is once every 15 seconds, the minimum is once every 90 seconds, and the average is once every 30 seconds.
The corrective action was confirmed. The ability to correct the offset of the metal strip was able to be controlled within ±3 mm. This depends on the shape of the metal strip, but detection is performed every 5 seconds, and the average operation is once every 30 seconds, so for every 10 detections, there is one correction operation. It was found that a line speed of this level has a sufficient control function.

It is fully possible to set each set value and dead zone as necessary and change the frequency of correction operations.

Furthermore, compared to conventional equipment, this equipment has a rougher hydraulic control mechanism and fewer mechanically operating parts.
The degree of failure is extremely low, and even dust contained in hydraulic oil can be controlled using a general solenoid valve.
It is easy to manage and troubles are reduced at the same level as above.

In addition, in terms of equipment, it can be manufactured at about one-tenth the cost of conventional correction equipment, and the amount of pressure oil used is extremely small. It is now possible to control the amount of pressure oil at less than 1/100th of what was previously used, and it can now be used in common with the operating hydraulic power source for lines that contain a relatively large amount of dust, which has a very large effect. It is extremely effective industrially.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a perspective view showing the unwinding state of the metal strip, FIG. 2 is an overall system diagram, and FIG. 3 is a diagram of the operating state of each timer. DESCRIPTION OF SYMBOLS 1... Metal band, 2... Unwinding shaft, 3... Drive device, 4a, 4b... Emitter, 5a, 5b... Light receiver, 6a, 6b... Photoelectric control unit, 7a, 7b... th... 1 on/off timer, 8a,
8b...Second on/off timer, 9a, 9b...Opening/closing contact, 10...Unwinder, 11a, 11b...Solenoid, 12...Hydraulic pressure switching solenoid valve, 13...Cylinder, 13a, 13b...Oil chamber , 14...piston.

Claims (1)

[Claims for Utility Model Registration] 1. In a meandering correction device that detects eccentricity of a metal band when it is eccentric, switches a hydraulic switching solenoid valve, displaces an unwinding shaft with a hydraulic cylinder, and returns the metal band to its normal position, A light emitter and a light receiver are arranged at both ends of the metal strip, and the signal output side of the light receiver is connected to a hydraulic switching solenoid valve via a first on/off timer and a second on/off timer having different on/off time intervals. Meandering correction device for metal strip processing line. 2. A metal strip processing line as set forth in claim 1 of the utility model registration claim, characterized in that the emitter and light receiver are each arranged slightly closer to the center of the metal strip than at both ends of the metal strip. meander correction device.