JPS6096318A - Automatic speed reducing device with instrument for detecting number of turns of inlet side coil - Google Patents

Abstract

PURPOSE:To prevent the generation of accident such as roll breakage by subtracting the number of revolutions of an unwinder from the number of turns of an inlet side coil detected by laser and calculating the residual number of turns for performing automatic speed reduction. CONSTITUTION:The number of turns of a coil 21 at the inlet side is calculated with a counter 42 by moving a laser emitter 22 and a recepter 23 from one end of the coil 21 to its other end in the direction of an arrow 37. The residual number of turns is calculated by subtracting the number of revolutions of a pulse oscillator 8 of unwinder from the number of turns of an inlet side coil inputted to a counter 42. The coil outer diameter under unwinding is obtained from the sheet thickness inputted to an inlet sheet-thickness setter 12, and the residual length of a coil 6 is accurately calculated. The residual length of unwinding coil 6 is constantly compared with the unwound length under speed reduction, and an accurate speed-reduction starting command is given to a speed commanding unit 13 from an arithmetic unit 51 when the deviation between them reaches a specified value. By this mechanism, the generation of serious accidents, such as the roll breakage caused by the tail end of coil, is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to cold rolling equipment and annealing/surface treatment line equipment, and particularly to an automatic speed reduction device with an inlet coil turns detection device.

[Background of the invention]

In the cold reversible rolling mill, in the first bus rolling, the inlet coil 6 inserted into the unwinding machine 1 shown in FIG. It passes through a deflector roll 4 and is wound up by a winder 5 to become an output coil 7. The rolling speed at this time is given by the speed command device 13, but at the start of rolling, the rolling speed is slow, then accelerated and maintained at or near the maximum speed. After that, after confirming that the remaining length of the inlet coil 6 has decreased, deceleration is performed,
Just before the remaining length runs out, slow down to slow speed.

Thereafter, the unwinding machine 1 is stopped with 2 to 3 windings remaining, and the first pass is completed. Subsequently, rolling in the opposite direction becomes the second pass.

After confirming that the remaining length of the inlet coil 6 has decreased, deceleration is performed. This deceleration rate is prescribed. Therefore, in order to complete the deceleration just before the remaining length runs out, the input coil 6 during deceleration must be determined by the speed before deceleration.
It is necessary to constantly compare the unwound length with the remaining length of the inlet coil 6 to find the point at which deceleration starts.

Conventionally, there are the following three methods for finding the point at which the deceleration starts.

(1) The operator determines when to start deceleration by looking at the speed before deceleration and the remaining length of the inlet coil 6.

(2) In FIG. 1, the inner diameter of the inlet coil 6 and the diameter of the inlet deflector roll 2 are known, and the plate thickness of the inlet coil 6 is determined by the computer 11 using the base material plate thickness setting device 12. Let it be input. Accordingly, by inputting the signals of the rewinding machine pulse generator 8 and the deflector roll pulse generator 9 to the total calculator 11, the remaining length of the inlet coil 6 can be calculated. On the other hand, the rewinding speed is determined by the deflector roll pulse generator 9, and the rewinding length during deceleration is calculated. By constantly comparing these two values, the time to start deceleration is determined, and a deceleration command is issued to the speed command device 13.

(3) The signal from the deflector roll pulse generator 9 in (2) is replaced with the mill pulse generator 10, and the deceleration start point is similarly determined and a deceleration command is issued to the speed command device 13.

Each of these methods has the following drawbacks. Method (1) relies on the operator's visual judgment, so the remaining length at the time of completion of deceleration varies widely and requires skill. (2
In the method (2), the deflector roll 2 often slips between the base material and the reliability of the calculated value is low. Moreover, the amount of calculation becomes enormous. Method (3) uses a mill pulse generator 1
Since the speed is higher than 0, it is necessary to set the rewinding speed by adding all types of reduction ratios to the values, but the setting of the reduction ratios is likely to be inaccurate, and the reliability of the remaining length calculation value is low. Also, performance 'N-
The amount becomes huge. Note that 14 in Figure 2 is a rolling reduction rate setting device.

If these drawbacks cause the start of deceleration to start earlier,
If the slow speed operation becomes longer and the production volume decreases or becomes slower, the tail end of the base material will pass through the mill at a speed higher than the slow speed, resulting in damage to the rolls of the mill or damage to the surrounding machinery. The tail end collides, damaging the machine and causing personal injury due to fragments.

[Purpose of the invention]

The object of the present invention is to use cold rolling equipment, and when decelerating from a steady speed at the end of the first pass, due to the ridges at the start of deceleration,
The goal is to eliminate roll damage and machine damage caused by the production being overrun or the tail end passing through the mill at high speed.

[Summary of the invention]

The key point of the present invention is to detect the number of windings of the incoming coil with a laser beam device before starting the first pass, and to calculate the number of remaining windings by reducing the number of unwinding rotations of the unwinding machine by the number of windings of the incoming coil.
Accurately calculate the remaining length based on the known plate thickness of the inlet coil, calculate and compare the mill speed and the unwinding length during the rolling reduction, find the % optimum deceleration start time, and send a deceleration command to the speed command device. It's on the way out.

[Embodiments of the invention]

FIG. 2 shows a schematic view of the detection of the number of windings on the inlet side of the cold reversible rolling mill of the present invention, FIG. 3 shows a detailed diagram of the detection of the number of windings on the inlet side, and FIG. 4 shows a diagram of the cold reversible rolling equipment.

The rolled coil 21 sent from the previous process is first
In the figure, a laser emitter 22 emits light onto the side surface of a coil 21, and a laser receiver 23 receives the reflected light. FIG. 3 is a detailed drawing of the detection of the number of coil turns on the inlet side, including a detailed drawing of the A-A' cross section of this coil 21. When the coil 21 is cut in section and viewed from the side, the coil is made up of 31% base material, 32% gap, and 32% coil hollow 33.
), the laser emitter 22 emits light thereon, and the base material 31
The laser beam 36 reflected by the laser receiver 23 is received by the laser receiver 23. The amount of received light is measured by the laser light receiving lid detector 38. If the laser emitter 22 and laser receiver 23 are moved in the direction of the arrow 37, the amount of received laser light can be measured by the laser light receiving lid detector 38.
If we take the received light iA of 8 vertically and the time t as the horizontal axis, as shown in the figure, when reflected on the base material 31, the received light amount is 39, and when there is a gap 32, the received light amount is small, 41, and the coil 21
Since no light is received when the outside and the hollow 33, the zero position 4
It becomes 0. In other words, if the coil 21 is moved from one end to the other, two pulses will be generated per turn.

This pulse is added by the turns counter 42 and divided by 2 to calculate the total number of turns of the inlet coil 210.

Next, in Figure 4, which is a diagram of the cold reversible rolling equipment, the inlet coil 6 whose number of turns has been detected is rolled by the mill 3 via the unwinder 1, the inlet deflector roll 2, and the outlet deflector roll. 4, the coil is wound up by a second winder 5, and becomes an output coil 7. The rolling speed at this time is given by the speed command device 13, and at the start of rolling, the rolling speed is slow, then accelerated and maintained at or near the maximum speed. The arithmetic unit 51 subtracts the number of rotations of the rewinding machine pulse generator 8 from the number of turns of the input 111j coil inputted to the number of turns counter 42 to obtain the number of remaining turns.

Since the inner diameter of the coil 6 is known, the outer diameter of the coil being unwound can be determined from the number of remaining turns and the thickness input from the base material plate thickness setting device 12, and the remaining length of the input coil 6 can be accurately calculated. I can do it. On the other hand, due to the signal from the mill pilot generator 52,
Since the deceleration rate is specified, the time from the start of deceleration to the completion of deceleration, that is, the deceleration time is calculated. Furthermore, the rewinding speed can be calculated accurately using the calculated input coil outer diameter and the signal from the unwinding machine pulse generator 8, and the rewinding length during deceleration can be calculated based on the deceleration time. Therefore, the calculated remaining length of the unwinding coil and the unwinding length during deceleration are constantly compared, and when the deviation reaches a prescribed value, a deceleration start command is given from the calculator 51 to the speed command device 13. This results in
The deceleration is completed while leaving exactly a prescribed value of the incoming coil remaining length (generally 3 to 5 turns).

In FIG. 3, which is a detailed diagram of the detection of the number of windings on the inlet side, if the side surface of the base material 31 is not flat, the side surface is treated to make it easier to reflect the laser beam. In addition, the number of windings must be detected several times by moving the laser device.

Also, since the width of the pulse when the amount of light received by the laser light amount detector 38 is large is almost one foot, if there is a clear difference, the accuracy of the number of turns detection can be improved by correcting the number of pulses using another standard pulse width. I can fall.

Further, in FIG. 3, the number of turns can also be detected by moving the coil instead of moving the laser device.

Further, the windings detected in FIG. 3, which is a detailed diagram of the detection of the number of windings on the incoming coil, can be used for automatic deceleration of tandem rolling equipment or automatic deceleration of line equipment for surface treatment, etc.

〔Effect of the invention〕

According to the present invention, it is possible to prevent production from decreasing due to large variations in the remaining length of the inlet coil at the time of completion of deceleration, and
This eliminates the drawbacks of serious accidents such as roll breakage, other machine damage, and personal injury caused by fragments caused by the tail end of the base plate passing through the mill at high speed.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional cold reversible rolling equipment, Fig. 2 is a schematic diagram of the detection of the number of turns of the inlet coil according to the present invention, and Fig. 3 is a detailed diagram of the detection of the number of turns of the inlet coil of the present invention. FIG. 1 is a system diagram of a cold reversible rolling facility of the present invention. 21...Inlet coil%22...Laser emitter%2
3... Laser receiver, 31... Coil base material %32
...Gap, 33...Coil hollow, 36...Laser beam. 37... Laser device moving direction, 38... Laser light reception amount detector, 39... Light reception amount reflected by base material,
40... Light receiving amount tower portion, 41... Portion where the amount of reflection is small due to the base material gap, 42... Winding number counter. Agent Patent Attorney Akio Takahashi Kaya L Kodai 2 Figure 2I Figure 3 $4 Eye

Claims (1)

[Claims] 1. In cold rolling equipment and annealing/surface treatment line equipment, means for detecting the number of turns of a coil before rolling with a laser beam, and subtracting the number of turns of the unwinding machine from the number of turns. 1. An automatic deceleration device with an inlet coil winding number detection device, comprising: means for calculating the remaining number of turns of an unwinding coil and automatically decelerating the winding coil.