JPH025483B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is directed to a rolling mill having a speed control standard, such as a strip steel mill, for example, to roll a rolled material while controlling tension between the rolling mill and the rolling mill. Calculate the maximum winding speed from the coil diameter during winding of the rolling equipment that has a winding machine that winds up the winding machine and the maximum rotation speed of the winding machine drive device, and check that the rolling machine exit speed does not exceed the maximum winding speed. The present invention relates to a speed control device for a rolling mill that limits the speed control standard of a rolling mill.

[Technical background of the invention]

Figure 1 is a block diagram showing an example of a conventional speed control device for a rolling mill. In the figure, F1, F2, and F3 are rolling mills, respectively, and 1 is a speed command generator (hereinafter abbreviated as MRH device) that generates a rolling speed signal 1a. ), 2-1,
2-2 and 2-3 are unique rolling signals 2-1a and 2-2 given to each of the rolling mills F1, F2, and F3.
A speed command generator (hereinafter referred to as
(abbreviated as SSRH device), 3-1, 3-2, 3-3
is the rolling speed signal 1a output from the MRH machine 1 and the rolling signals 2-1a, 2-2a, 2-3a output from each SSRH machine 2-1, 2-2, 2-3, and each corresponding A multiplier 4 is a mandrel which is applied to the rolling mills F1, F2, and F3. and rolled material 5
are rolling mills F1, F2, F arranged in tandem.
3 in the direction of arrow A in the figure, and then rolled up by a mandrel 4. Therefore, rolling mill F3
becomes the final rolling mill.

Each rolling mill F1, F2, F in such a configuration
The relationship between the speed control standard in No. 3 and the winding speed of the mandrel 4 will be explained. First, a uniform rolling speed signal 1a is applied to all rolling mills F1, F2, and F3.
An MRH machine 1 that generates
2, SSRH device 2-1, 2-2 for each F3,
2-3 is installed, and this SSRH device 2-1, 2-2, 2
-3, the rolling speed signals 2-1a, 2-2a, 2-3a specific to each rolling mill F1, F2, F3 are output. And this rolling speed signal 2-1a, 2-2
a, 2-3a and the rolling speed signal 1a by a multiplier 3-
Multiply by 1, 3-2, 3-3 to obtain each rolling mill F1,
Speed control standards 3-1a, 3-2a, to F2, F3
Give as 3-3a. This speed control standard 3-1
a, 3-2a, and 3-3a to control the rotational speed of each rolling mill driving electric motor (not shown), and each rolling mill F1,
The rolling speeds of F2 and F3 are controlled. Further, a tension control reference 4a is applied to the mandrel 4 to control the rotation speed, and winding is performed while applying tension to the rolled material 5 between the rolling mill F3 and the mandrel 4. This rotational speed N _M can be expressed by the following equation (1). In addition, equation (1) is the rolling mill exit speed
V _M , coil diameter D _M , gear ratio i, and number of rotations of the mandrel drive device are indicated by N _M .

N _M =V _M /π・i・D _M ...(1) [Problems in the background art] By the way, in a rolling equipment with such a configuration, for example, a temperature control device (not shown) is installed to control the temperature. The MRH machine 1 is operated by a rolling speed correction signal (hereinafter referred to as an external correction signal) from an external source (not shown) such as a rolling speed correction signal from a control device, and the rolling speed signal 1a is changed to control all rolling mills F1 and F.
2, the rolling speed of F3 is corrected. In such a case, for example, if the external speed correction signal acts on the MRH machine 1 to increase the rolling speed of all rolling mills F1, F2, and F3,
The output signal 1a from the MRH machine 1 is transmitted to each rolling mill F1,
It acts to increase the rolling speed of F2 and F3.
And speed control standards 3-1a, 3-2a, 3-3
a increases so as to increase the speed of each rolling mill F1, F2, F3, and the rolling speed of all rolling mills F1, F2, F3 is uniformly increased. However, mandrel 4
Depending on the capacity of the drive device (not shown) and the diameter of the coil being wound, the winding speed may vary depending on the rolling machine F3.
It is not possible to increase the rotation speed to a value corresponding to the exit speed of the rolling mill F3, and a speed difference is created between the exit speed of the rolling mill F3 and the winding speed of the mandrel M, and tension is applied to the rolled material 5 between the rolling mill and the mandrel. become unable to do so. This causes negative electrical effects such as the rotational speed of the mandrel drive device becoming overspeed and the power supply device for the mandrel drive device (not shown) being overloaded. Also, since the winding material is not under tension, the shape of the winding shape There was a problem in that the material was not properly conveyed due to poor mechanical properties.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and provides an appropriate tension to the rolled material between the rolling mill and the mandrel without creating a speed difference between the exit speed of the rolling mill and the winding speed of the mandrel. The object of the present invention is to provide a speed control device for a rolling mill that can perform winding.

[Summary of the invention]

That is, the present invention calculates the maximum winding speed for the coil diameter from the diameter of the coil being wound on the mandrel and the maximum number of turns of the mandrel drive device, and prevents the exit speed of the rolling mill from exceeding the maximum winding speed. The speed standards for rolling mills are limited.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to a block diagram shown in FIG. 2, in which the same parts as in FIG. 1 are given the same reference numerals. In the figure, 6 is a coil diameter detector for detecting the coil diameter of the mandrel 4, and 7 is an arithmetic unit which is given the output signal of the coil diameter detector 6 and calculates the maximum winding speed for that coil diameter. 8 is given the calculation result of the calculator 7 and the output signal 2-3a of the SSRH device 2-3 in the final rolling mill F3, so that the exit speed of the rolling mill F3 does not exceed the maximum winding speed of the mandrel 4. A limit value calculator 9 limits the output signal 1a of the MRH device 1, and a limiter 9 limits the value of the output signal 1a from the MRH device 1 to the value calculated by the limit value calculator 8.

With such a configuration, the coil diameter detector 6 always detects the diameter of the coil being wound as shown in FIG. Then, from the output signal from the coil diameter detector 6 and the maximum rotational speed determined by the capacity of the mandrel driving motor, the calculator 7 calculates the maximum winding speed of the mandrel using the following equation (2). Equation (2) expresses the maximum winding speed.
V _MAX , the maximum rotation speed of the mandrel as N _MAX , the output signal from the coil diameter detector 6 as _DA , and the gear ratio as i.

V _MAX =π・i・D _A・N _MAX (2) Next, the output signal from the limit value calculator 8 will be explained. In general, the exit speed of the rolling mill and the
The MRH value and the SSRH value of the rolling mill have a relationship shown in the following equation (3). Equation (3) indicates the outlet speed as V _R , the MRH value as MRH, and the SSRH value as SSRHn.

V _R = MRH×SSRHn ……(3) Using this formula (3), limit value calculator 8
The value limit is calculated using the following equation (4). Equation (4) is
Maximum winding speed is V _MAX , SSRH machine 2 of rolling mill F3
-3 output signal 2-3a is indicated by SSRH _A , and the MRH limit value is indicated by MRH _L.

MRH _L = V _MAX /SSRH _A ...(4) The output signal 1 of the MRH unit 1 is determined by the limiter 9 which inputs the output signal 8a from the limit value calculator 8.
Limit a to the MRH limit value MRH _L.

In this way, for example, suppose that an instruction is given to the MRH machine 1 to increase the speed of the rolling mills F1, F2, and F3 all at once based on an external correction signal (not shown).
As a result, when the output signal 1a from the MRH device 1 increases in the direction that the rolling mill speeds up all at once and its value becomes larger than the maximum winding speed value, the output signal 1a from the MRH device 1 is outputted by the limiter 9 to the limit value calculator. The output signal 1a of the MRH unit 1 is limited so that it does not exceed the calculated value in step 8, and the winding speed of the mandrel 4 does not become slower than the exit speed of the rolling mill F3. Winding can be performed while always applying appropriate tension to the material.

〔Effect of the invention〕

As described above, the present invention prevents the rolling machine outlet speed from exceeding the maximum winding speed of the mandrel during speed increase in rolling equipment consisting of a rolling mill and a winding machine installed behind it. It is possible to provide a speed control device for a rolling mill that limits the speed at the exit side of the rolling mill so that the rolled material is not damaged, thereby ensuring a good winding shape of the rolled material and electrically protecting the mandrel drive device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional speed control device for a rolling mill, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1... Speed command generator (MHR), 2-1, 2
-2, 2-3...Speed command generator (SSRH), 3
-1, 3-2, 3-3... Multiplier, 4... Mandrel, 5... Rolled material, 6... Coil diameter detector, 7
...Calculator, 8... Limit value calculator, 9... Limiter, F-1, F-2, F-3... Rolling mill.

Claims (1)

[Claims] 1. In a rolling equipment where rolled material rolled by multiple rolling mills arranged in a tandem manner is wound up by a winding machine installed behind the rolling mill, the coil diameter of the rolled material wound by the winding machine is detected. a coil diameter detector for detecting the coil diameter; a calculator for calculating the maximum winding speed from the detected value of the coil diameter detector and the maximum rotation speed of the drive device of the winding machine;
The maximum winding speed calculated by this calculator and the speed of the rolling mill are given, and the speed control standard of the rolling mill is limited so that the exit speed of the rolling mill does not exceed the maximum winding speed. Rolling mill speed control device.