JPH077006B2 - Thin steel plate mill Stand steel plate speed measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a steel plate speed measuring device between thin steel plate mill stands during cold rolling and hot rolling.

<Prior art and its problems> In the rolling of thin steel sheet, the thickness and tension are measured between each stand and the rolling reduction and tension control are performed. Plate thickness accuracy is affected by the plate speed between mill stands.

Generally, in rolling, the actual steel plate speed V on the work roll exit side is faster than the work roll speed V _R of the rolling mill.

Conventionally, since the steel plate speed between stands is unknown,
Using a constant called the steel plate divided into'll go-between advanced rate of such material from the experience, predicts the steel sheet speed of between stand as V = V _R (1+), reduction of the next stand, because it was the setting of the tension, etc. However, this is an obstacle to improving the plate thickness accuracy. Therefore, the measurement of the actual steel plate speed between stands is an essential issue for improving the thickness accuracy.

The present invention has been proposed in view of such circumstances,
It is an object of the present invention to provide a steel plate speed measuring device capable of accurately measuring the steel plate speed between mill stands.

<Means for Solving Problems> A steel plate speed measuring device according to the present invention is attached to a side surface of a roll for a tension meter installed between mill stands, and detects a groove or the like at equal intervals in a circumferential direction. Detection disc provided with a section, a detector such as an eddy current type displacement meter which is installed facing the detection disc and can detect the detection target, and a detection target from the detection unit. It consists of a speed converter that counts the detection signals corresponding to the parts and calculates the rotation speed of the roll for tension meter, that is, the steel plate speed between stands based on the count value within a fixed time, and accurately calculates the steel plate speed between mill stands. This is intended to improve the plate thickness accuracy by measuring and using this for rolling and tension control.

<Example> Hereinafter, the present invention will be described based on an illustrated example.

As shown in FIG. 2, a tension roll 2 as a tension meter is arranged between the quadruple rolling mills 1 arranged in tandem, and the tension between steel plates between stands is detected by a load cell method or the like.

The steel plate speed measuring device 3 according to the present invention is installed on the side portion of such tension roll 2.

As shown in FIG. 1, the steel plate speed measuring device 3 includes a steel detection disk 4 attached to the side surface of the tension roll 2,
A detector 5 for detecting a detected portion of the detection disk and a speed converter 6 for processing a detection signal from the detector 5 are provided.

As shown in FIG. 3, the detection disc 4 is a steel plate having the same outer diameter as that of the tension roll and notched grooves 4A formed in the periphery at equal intervals in the circumferential direction. This notch
The detector 5 detects 4A.

As shown in FIGS. 4 to 6, the detector 5 is arranged so as to face the notch groove 4A and is mounted on the support base 7 of the tension roll 2 so that its position can be adjusted. Although various types of detectors can be considered as the detector 5, a vortex type detector 5 is used to measure the gear gap (displacement amount) with the detection disc 4
The notch groove 4A is detected as shown in the figure.

The speed converter 6 counts only the detection signals corresponding to the notch grooves 4A amplified by the amplifier 8 and calculates the rotation speed of the roll, that is, the inter-stand steel plate speed, from the count value within a fixed time. The calculation result is used for plate thickness control.

Here, if the steel plate speed is V, the tension roll diameter is D, the number of notch grooves is N, the speed calculation cycle is t, and the number of input pulses (count value) within time t is Nt, the rotation speed at the outer periphery of the roll 2 V is Therefore, if the tension roll diameter D is initially set, the steel plate speed can be automatically obtained.

Further, the work roll pulse is also input to calculate and output the advanced rate.

Further, the accuracy of the steel plate speed differs depending on the number of notch grooves and the speed calculation cycle, and as is clear from the examination results in Table 1, the higher the number of notch grooves and the longer the speed calculation cycle, the higher the accuracy.

This accuracy is a condition for obtaining the desired accuracy and calculation cycle. For example, speed calculation cycle is within 1 sec, accuracy is 0.1%
To obtain, the number of notch grooves must be 32. Also, 8 sec
If 0.2% or less, the number of notch grooves is two. Conversely, by changing the number of notch grooves, the speed calculation cycle and accuracy also change.

This is an example in which the steel plate speed was measured using the detection disk having four notched grooves and the eddy current displacement meter shown in Table 2, and the results shown in FIG. 9 were obtained.

<Effects of the Invention> As described above, according to the present invention, the detection disk having the detected portion is attached to the side surface of the tension roll, the detected portion is detected by the detector, and the speed converter detects the detected signal based on the detected signal. Since the rotation speed of the tension roll, that is, the steel plate speed between stands, is calculated, the steel plate speed between mill stands can be accurately measured, and by using this for plate thickness control, the plate thickness accuracy can be improved. .

Further, the device is simple and inexpensive, and is not broken even if the plate is broken. Failure recovery time is as short as 3-4 minutes.

Further, it is not affected by the surrounding environment such as rolling oil and has good environment resistance.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an apparatus according to the present invention, FIG. 2 is a schematic view showing a rolling line, FIG. 3 is a front view showing a detection disc, FIG. 4, FIG. 5, FIG. Is a front view, a plan view, a side view showing the sensor, FIG. 7 is a graph showing the output value of the sensor, FIG. 8 is a configuration diagram showing rolling control together with a flow chart, and FIG. 9 is a detection device of the present invention. It is a graph which shows the result of having measured the steel plate speed. 1 ... Quadruple rolling mill, 2 ... Tension roll, 3 ...
Steel plate speed measuring device, 4 …… Detecting disc, 4A …… Notch groove,
5 ... Detector, 6 ... Speed converter, 7 ... Supporting platform, 8
……amplifier.

Claims (1)

[Claims] 1. A device for measuring a steel plate speed between thin steel plate mill stands, which is attached to a side surface of a roll for a tension meter installed between mill stands and has detection parts at equal intervals in a circumferential direction. A detection disc provided, a detector that is installed facing the detection disc and can detect the detected portion, and a detection signal corresponding to the detected portion from this detector is counted for a fixed time. A thin steel plate mill stand steel plate speed measuring device comprising a speed converter for calculating the rotational speed of a roll for a tension meter, that is, the steel plate speed between stands based on the count value in the table.