JPS6247776B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotation amount control device for controlling the amount of rotation of a coil material made of a steel plate or the like.

BACKGROUND ART Processing of coiled materials such as steel plates includes processing in which the coiled materials are driven by a predetermined amount of rotation, then stopped, and then cut. In such processing, it is first necessary to stop the tip of the coil material at a predetermined position, and to achieve this, the amount of rotation of the rotating roll must be accurately controlled in accordance with the coil diameter of the coil material. There is a need.

A conventional rotation amount control device had a configuration as shown in FIG. To explain Figure 1,
A rotating roll 2 is provided in contact with the outer edge of the coil material 1, and drives the coil material 1 to rotate around its rotation axis. The rotation of the rotary roll 2 is detected by a detector 3, and a rotation signal 3a consisting of pulses is output from this and supplied to a counter 4. The counter 4 counts the pulses of the rotation signal 3a and holds a count value corresponding to the amount of rotation of the rotating roll 2. On the other hand, in order to set a desired amount of rotation of the rotary roll 2, a setting circuit 5 is provided, and a rotation amount signal 5a is supplied from this to a comparison circuit 6. The comparison circuit 6 receives a count signal 4a containing the count value supplied from the counter 4.
and the rotation amount signal 5a, and when they match, a match signal 6a is supplied to the gate circuit 7.
The gate circuit 7 is connected to the rotary roll 2 from the drive circuit 8.
A drive signal 8a for driving is input. The gate circuit 7 passes the drive signal 8a until the coincidence signal 6a is input, and the rotating roll 2 is thereby driven.

By the way, the amount of rotation of the rotating roll 2 is the same as that of the coil material 1.
Since it is given in terms of length, as the coil diameter of the coil material 1 changes, the rotation angle of the coil material 1 changes and its stopping position changes.

As described above, the conventional rotation amount control device has the drawback that as the coil diameter changes, the error in the stopping position of the coil material increases.

The present invention has been made in order to eliminate such drawbacks of the conventional ones, and provides rotation amount control that improves the accuracy of the stopping position of the coil material by including the coil diameter of the coil material as a control element. The purpose is to provide equipment.

First, a method for calculating the rotation amount AP of the coil material 1 used in the present invention will be explained. FIG. 3 is a layout diagram of the coil material 1, the rotating roll 2, and the measuring rotating roll (hereinafter referred to as rotating roll) 9.
Regarding the coil material 1, D is the coil diameter, O ₁ is the center point, A is the tip, B is the contact point with the rotating roll 9, P is the stopping point, and α is the angle at which line ₁ intersects the horizontal line passing through the center point O ₁ , θ is the angle between ₁ and line ₁ , γ is the _{line 1 3} connecting center point O ₃ of rotating roll 2 and center point O ₁
indicates the angle at which O intersects the vertical line passing through the center point O ₁ . Regarding rotating roll 2, d/2 is the radius, O ₃
and O ₄ respectively indicate the center point, and h indicates the distance between the center point O ₃ and the point on the horizontal line X. Regarding the rotating roll 9, O ₂ is the center point, r/2 is the radius, J is the intersection of the horizontal line passing through the center point O ₁ and the vertical line passing through the center point O ₂ , and L is the distance between the center point O ₂ and the intersection J shows. Regarding the horizontal line X, D E F G is the center point O ₄ ,
The intersection point with the vertical line passing through O ₁ , O ₃ , O ₂ , H is the fixed center point where the rotating roll 9 moves with radius R while contacting the outer edge of the coil material 1 , l ₁ is the intersection point D and E l ₂ is the distance between the intersection point F and the center point H, and β is the angle at which the line O ₂ H and the horizontal line X intersect. The rotating roll 9 moves from the intersection O _2a to the intersection
The amount of movement up to O ₂ is measured by the measuring device 12 attached to the rotating roll 9, and the angle β obtained thereby is
If we pay attention to the line from (<O ₂ hO _2a ), the following equation holds true.

Rsin(π-β)-L=D+d/2cosγ+h...(1) Also, looking at the line, D+r/2cosα=l ₁ +l ₂ -Rcos(π-β)...(2) On the other hand, L=D+r/2sinα ...(3) From equations (1) to (4) Since γ, l ₁ , l ₂ , R, d, and h in equation (5) are known, the coil diameter D can be calculated by knowing only the angle β. The calculation formula for the coil diameter D is as follows.

Here, a=1/4 {(rd) ² −4(Rsinβ−h) ² } b=[r ² −d ² /4−{(l ₁ +l ₂ +Rcosβ) ² +(Rsinβ−h) ² −l ₁ ² }] ×(r−d)−2d×(Rsinβ−h) ² c=[r ² −d ² /4−{(l ₁ +l ₂ +Rcosβ) ² +(Rsinβ−h) ² − l ₁ ² }] ² −4×(Rsinβ−h) ² ×(d ² /2−l ₁ ² ) Furthermore, if we know the coil diameter D and set the angle θ to a fixed value, then from the tip A of the coil material 1 The amount of rotation AP up to the stopping point P is determined by the following formula.

AP=D/2×θ (7) If the stopping point P at the tip of the coil material 1 is a fixed position, the angle θ is given as a fixed value. On the other hand, the amount of rotation AP of the rotary roll 2 is calculated by substituting D obtained from equation (6) into equation (7). Since the rotation amount AP calculated in this way is given so that the stop position of the tip of the coil material 1 is a fixed position regardless of the size of the coil diameter of the coil material 1, the error in the stop position is reduced.

Next, an explanation will be given with reference to FIG. 2, which is an embodiment of the present invention constructed with attention to equations (5) to (7).

In FIG. 2, numerals 1 to 8 are as already explained. The arithmetic circuit designated by numeral 10 is a normal one, and receives an angle signal 9a of the angle β detected by a measuring device 12 attached to the rotating roll 9, and calculates the value based on the angle signal 9a and equation (5). , the coil diameter D is calculated. The result of this calculation is sent to the calculation circuit 11 by the coil diameter signal 10a.
supplied to The arithmetic circuit 11 is composed of a normal arithmetic circuit, and calculates the rotation amount AP based on equation (6). This calculation result is the rotation amount signal 11
a to the comparator 6.

Explain the operation. As is clear from the above description, the rotation amount signal 11a is a signal for setting the rotation amount of the rotary roll 2 calculated using the angles β and θ as parameters. On the other hand, the rotation of the rotary roll 2 is detected by the detector 3, and becomes a detection signal 3a, which is supplied to the counter 4 and integrated or counted. Count signal 4a which is the result of counting
is the comparator 6 to be compared with the rotation amount signal 11a.
and when the two match, the comparator 6 outputs a match signal 6a. The coincidence signal 6a is input to the gate circuit 7, and the drive signal 8 from the drive circuit 8 is input to the gate circuit 7.
The passage of a is controlled. As a result, the gate circuit 7 outputs a driving signal 8a with a time corrected in accordance with the coil diameter D of the coil material 1, and the coil material 1 is stopped at a predetermined position.

Note that the arithmetic circuits 10 and 11 may be configured as one arithmetic circuit, and the arithmetic processing may be performed sequentially.

As described above, according to the present invention, since the amount of rotation of the rotary roll is corrected according to the coil diameter of the coil material, the stopping position of the coil material can be accurately controlled.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional rotation amount control device.
FIG. 2 is a layout diagram of the coil material and rotating rolls in the present invention, and FIG. 3 is a diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Coil material, 2, 9... Rotating roll, 4... Counter, 6... Comparison circuit, 7... Gate circuit, 8... Drive circuit, 10, 11... Arithmetic circuit, 12... Measuring instrument.

Claims (1)

[Claims] 1 Equipped with two rotating rolls that touch the outer edge of the coil material and drive it to rotate, detect the amount of rotation of one of the rotating rolls, compare this amount of rotation with a preset rotation amount, and compare the amount of rotation between both rollers. A rotation amount control device that controls the rotating roll to drive the rotating roll until the values match, a measuring rotating roll that is in contact with the outer edge of the coil material and moves with a point apart from the coil material as a center point; a first angle at which the horizontal axis intersects with a line connecting the center point of the axis of the rotating roll for measurement, and a preset second angle formed by the tip of the coil material and the stopping point, the coil and an arithmetic circuit that calculates the amount of rotation of the rotary roll based on the set position and diameter of the two rotary rolls that rotate and drive the rotary roll, the diameter of the measuring rotary roll, the position of the center point, and the radius of movement thereof. Characteristic rotation amount control device.