JPS6410427B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic deceleration control device, and particularly to a steel plate,
This relates to an entry side automatic deceleration control device used to calculate the start point of deceleration of the speed of a strip material made of various materials such as paper, rubber, plastic, etc. when it is unwound from its coil by an unwinding machine. be.

Entry side automatic deceleration control is to complete the deceleration of the speed of the strip material when the tail end of the strip material being rewound by the unwinding machine leaves the unwinding machine.
This is a control that prevents damage to machinery and equipment and damage to the strip material due to swinging of the tail end of the strip material.

A conventional device of this type is shown in FIG. In Figure 1, 1 is a rewinding machine, 2 is a rewinding machine 1
3 is a pinch roll that rolls into contact with the strip steel plate 4 pulled out from the coil 2; 5 is a rotation amount measuring device connected to the unwinding machine 1 to detect the amount of rotation; 6; is pinch roller 3
7 is a speed calculation circuit that receives the output of the movement amount measuring device 6 and calculates the unwinding speed of the steel plate. 8 is the output of the movement amount measuring device 6. A coil circumference calculation circuit calculates the coil circumference value of the coil 2 being rewound by the unwinding machine 1 in response to the output of the rotation amount measuring device 5, and 9 is a coil calculated by the coil circumference calculation circuit 8. Coil circumference difference calculation circuit for calculating coil circumference difference from circumference value, 1
0 is a deceleration timing calculation that sends out a timing signal DT representing the timing to start decelerating the speed of the steel plate 4 based on the coil circumference difference output calculated by the coil circumference difference calculation circuit 9 and the speed output calculated by the speed calculation circuit 7. It is a circuit.

In the configuration shown in FIG. 1, the amount of rotation of the steel plate 4 being rewound from the coil 2 attached to the unwinding machine 1 is measured by a rotation amount measuring device 5, and the distance of movement of the rewound steel plate 4 is measured by a rotation amount measuring device 5. A signal l proportional to is measured by the steel plate movement measuring device 6. The speed calculating circuit 7 calculates the speed V of the steel plate 4 by measuring the signal l for a certain time t.

The coil circumference calculation circuit 8 calculates the coil circumference value C _i of the coil 2 based on the signal 1 and the one rotation detection signal of the coil 2 measured by the rotation amount measuring device 5 . The coil circumference difference calculation circuit 9 calculates the coil circumference difference ΔC by calculating the difference between the previous coil circumference value C _i-1 and the current coil circumference value C _i every time the coil 2 rotates once. .

Next, the deceleration timing calculation circuit 10 performs the following (1).
From equations (2) and (2), find n for which equation (3) holds true, and from equation (4), find the coil circumference value C _o that corresponds to n found.
From the derived coil circumference value C _o and the coil circumference value C _i determined by the coil circumference calculation circuit 8, the moving speed of the steel plate 4 is started to be reduced when C _o ≧C _i is established.

L _R =V ² /2α+L〓 ...(1) L _o =nπD ₀ +n(n+1)/2×ΔC ...(2) L _R ≦L _o ...(3) C _o =πD ₀ +n×ΔC ... ...(4) Here, V is the moving speed of the steel plate 4, α is the rate of deceleration of the speed of the steel plate, L〓 is the length of the steel plate that should be left in the unwinding machine 1 when the speed of the steel plate 4 has been decelerated, and D ₀ is The diameter of the unwinding machine 1 and n indicate the number of coil turns.

In this way, conventional entry-side automatic deceleration control devices are designed to unwind the coil under conditions where equations (1) to (4) hold, so changes in the space factor of the coil and pinch roll This does not include the amount of slip between the steel plate and the steel plate. Therefore, if equations (1) to (4) no longer hold due to a change in the space factor or a slip, for example, the deceleration start timing will change, resulting in an error in deceleration control. It was hot.

The present invention has been made in order to eliminate the drawbacks of the conventional ones as described above, and by taking into account errors caused by changes in the space factor of the coil, slips between the pinch roll and the steel plate, etc. It is an object of the present invention to provide an automatic deceleration control device that can output a deceleration command more stably than in the case of the present invention.

An embodiment of the automatic deceleration control device of the present invention will be described below with reference to FIG. 2, in which parts corresponding to those in FIG. 1 are denoted by the same reference numerals. In FIG. 2, 15 is a data check circuit for checking the data of the coil circumference value C _i obtained by the coil circumference calculating circuit 8, and 16 is a data check circuit for storing the coil circumference value data checked by this data check circuit 15. A coil circumference difference calculation circuit 17 calculates the circumference difference for each rotation of the coil based on the circumference value, the coil circumference value m rotations earlier, and the space factor correction coefficient; 17 is output from the data check circuit 15; A coil turns calculation circuit calculates the number of coil turns from the coil circumference value and the coil circumference difference, and 18 calculates the timing to start decelerating the speed of the steel plate from the coil circumference difference and speed, and sends out a deceleration timing signal DT. This is a deceleration timing calculation circuit.

The entry side automatic deceleration control device shown in FIG. 2 operates as follows. In FIG. 2, the data check circuit 15
Now, the coil circumference value C _i calculated by the coil circumference calculation circuit 8 is compared with the coil circumference value C _ij calculated previously, and the following formula |C _i −C _ij |≦2πj×hmax...( 5) Only the coil circumference value C _i for which the following is true is sent to the coil circumference difference calculating circuit 16 as the coil circumference value.

Here h _nax is the maximum value of the coil plate thickness, (1)
By checking the data of the formula, variations in the coil circumference due to slip between the pinch roll 3 and the steel plate 4 can be prevented.

Next, the coil circumference calculation circuit 16 uses the coil circumference value C _i from the data check circuit 15 and the unwinding machine 1
Using the coil circumference value C _in m rotations ago and the space factor correction coefficient k, the coil circumference value ΔC _i is determined by the following equation.

ΔC _i = (C _i - C _in /m×k+ΔC _i-1 )/(k+1) ...(6) Here, equation (6) takes into account the space factor of coil 2 and calculates the circumference difference ΔC _i . This is the calculation you are looking for. In other words, when winding the material into a coil in the pretreatment process, the space factor differs depending on whether the coil diameter at the start of winding is small and when the coil diameter at the end of winding is large, and the former is usually better. big. On the other hand, there are also simple variations in the space factor that are not dependent on the coil diameter. Equation (6) is the difference in circumference that corrects the above-mentioned simple variation by dividing the circumference values between this time and m rotations ago and averaging them by m,
The previous circumference value, which is least affected by the space factor change due to the coil diameter, is used, and these are weighted by k:1 to obtain a circumference difference ΔC _i with high accuracy. . The space factor correction coefficient k is an appropriate value selected depending on the material of the coil material, the processing method of the coil pretreatment equipment, etc., and is a weighting adjustment coefficient. The winding number calculation circuit 17 calculates the current winding number i of the coil using the following equation.

i=Ci+C ₀ /ΔCi However, C ₀ is the circumference value of the rewinding machine Furthermore, in the subtraction timing calculation circuit 18, the following formula is used: π×D ₀ ×n+n(n+1)/2×ΔC _i ≦V ² /2α+L〓 ……( 8) Find the number of coil turns n that satisfies the following, and when the number of coil turns satisfies n≧i...(9), start reducing the speed of the steel plate 4.

Here, D ₀ is the diameter of the unwinder, V is the speed of the steel plate,
α is the deceleration rate of the speed of the steel plate, L〓 is the length of the steel plate to be left in the unwinding machine when the speed reduction of the steel plate 4 is completed, and n is the number of turns of the coil.

In the above embodiment, the case where a coiled steel plate in a steel plant is unwound is explained, but it goes without saying that this control device can be applied to coiled materials such as paper as well. Effects similar to those of the embodiment can be obtained.

As described above, according to the present invention, when calculating the deceleration start timing from the coil circumference value, correction of the variation in the timing due to slip etc. is introduced by correcting the coil space factor change and checking the consistency of the circumference value. Therefore, it is possible to average the coil circumference value to prevent variations, and also take space factor into account to eliminate errors in deceleration start timing due to changes in circumference difference, making it possible to eliminate automatic deceleration control on the entrance side of the coil compared to the conventional case. This can be achieved more reliably and with higher precision than .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional automatic deceleration control device, and FIG. 2 is a block diagram showing an embodiment of the automatic deceleration control device according to the present invention. 1: Rewinding machine, 2: Coil, 3: Pinch roll,
4: Steel plate, 5: Rotation amount measuring device, 6: Travel amount measuring device, 7: Speed calculation circuit, 8: Coil circumference calculation circuit, 9: Coil circumference difference calculation circuit, 10: Deceleration timing calculation circuit, 15: Data check circuit, 1
6: Coil circumference difference calculation circuit, 17: Coil turns calculation circuit, 18: Deceleration timing calculation circuit.

Claims (1)

[Scope of Claims] 1. A rotation amount measuring device that measures the rotation amount of an unwinding machine that unwinds the strip material from the coil, a movement amount measuring device that measures the amount of movement of the strip material that is unwound from the coil, and A speed calculation circuit that calculates the moving speed of the strip material based on the movement amount signal measured by the movement amount measuring device, and a circumference value of the coil based on the detection signals from the rotation amount measuring device and the movement amount measuring device. A coil circumference calculation circuit that calculates the coil circumference calculation circuit, a coil circumference value Ci output from this coil circumference calculation circuit, and a coil circumference value C _ij output from the coil circumference calculation circuit before j rotations of the unwinding machine. Therefore, Ci−C _ij ｜≦2πj×hmax, where hmax is the maximum value of the material thickness, a data check circuit that outputs only the circumference value Ci that satisfies , and the coil circumference value output by this data check circuit. Using Ci and the coil circumference value C _in output by the data check circuit before m rotations of the unwinding machine, the coil circumference difference ΔCi is calculated as follows: ΔCi=(Ci−C _in /m×K+ΔC _i-1 )/ (K+1) However, K is the space factor correction coefficient, and ΔC _i-1 is the circumference difference before one rotation of the rewinding machine. A coil turns calculation circuit calculates the coil turns based on the coil circumference difference and the coil circumference value Ci output from the data check circuit, and the coil turns calculated by this coil turns calculation circuit is the same as the coil turns at the start of deceleration. An automatic deceleration control device characterized by comprising a deceleration timing calculation circuit that generates a deceleration timing signal when the temperature decreases.