JPS62208819A - Cutting control device - Google Patents

Abstract

PURPOSE:To improve cropping precision for the tail end of a hot-rolled steel strip by using a distance counter for measuring the shift distance change of a materials within a predetermined range and a time counter for measuring the shift time thereof, and correcting the measured shift distance through the operation of an acceleration rate. CONSTITUTION:A metal 5 passes through a line speed detecting roll 3 and is detected by a tail end detector 1a, the number of pulses from a transmitter 4 until the arrival of the material 5 at the tail end detector 1 is measured in a distance counter circuit 8 from a gate 9 and time is measured in a time counter circuit 14 from a gate 15. The material 5 is carried at a speed added with an extra corresponding to a lead rate and when the detector 1 has detected the speed, the value of the circuit 8 corresponds to the position of a material 6, and not a distance 'L'. Therefore, the value of the circuit 14 is sent to the circuit 8 for the operation of an acceleration rate and a corrected value is inputted in a crop length setting device via a comparison detecting circuit 13 for comparison with the value of a correction setting circuit 12 as corrected in distance and function and for subsequent outputting to a crop shear 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cutting control device for a tail end crop of a heat-controlled rolling equipment of a Yu steel plant.

[Conventional technology]

FIG. 3 is a block configuration diagram showing a conventional crop cutting control device, in which (1) is a tail end detector, (2) is a crop shear, and (3) is a measuring roll for detecting line speed (
(hereinafter referred to as the length measuring roll), (4) is the length measuring roll (
3) is a pulse transmitter attached to, (5) is a material, (8
) is the crop material cut by the crop shear (2), (7) is the crop length setting device, and (8) is the tail end detector (1).
), (9) is a gate that starts counting by the detection signal from the tail end detector (1), and (10) is the tail end detector (1). ) and the crop shear (2), (11) is an operation correction circuit that corrects the operation of the crop shear (2), and (12) is the crop length setting device (7) and the distance correction value. and a crop length correction setting circuit (13) that adds and subtracts the operation correction value of the crop shear (2) and sets the corrected crop length value, and (13) a distance counter circuit (8) and a crop length correction setting circuit (12). This is a comparison detector that compares the values of and issues a start command to Cropshire (2).

Next, the control operation will be explained.

The material (5) that has passed through the length measuring roll (3) is sent to the tail end detector (
1), the tail end is detected, and at the same time as the detection, the gate (9) of the distance counter circuit (8) is opened, and the pulse signal from the pulse oscillator (0) starts measuring in the distance counter circuit (8). The crop length set by the crop length setter (7) includes a correction value by the distance correction circuit (10) between the tail end detector (1) and the crop shear (2), and a correction value for the crop shear (2). The correction value by the operation correction circuit (11) is added or subtracted to determine the crop length correction setting value.When the count value of the counter circuit (8) reaches the distance of this crop correction setting value, the comparison detector (13) ) generates a start command, the crop shear operates, and the crop is cut.

[Problem that the invention seeks to solve]

Since the conventional crop cutting control device is configured as described above, when the material passes through the length measuring roll, it is conveyed at a speed equal to the rolling speed and the lead rate, so the output from the pulse transmitter attached to the length measuring roll is There is a difference between the tail end tracking by pulse counting and the tail end position of the actual material, which results in an error in the tail end crop length. It is necessary to further adjust the crop length setting, and this poses a problem in that efficient crop cutting control cannot be achieved.

This invention was made in order to eliminate the problems of the conventional ones as described above, and it tracks the position of the tail end of the material that has passed through the length measuring roll and improves the accuracy.

<Objective of the present invention is to provide a control device for cutting a tail end crop.

[Means for solving problems]

The cutting control device according to the present invention includes a distance counter circuit that measures the degree of change in the moving distance of a material moving within a predetermined distance, and a time counter circuit that measures the time required for the movement. Compare the magnitude relationship between the calculated movement distance measurement value of the material and the movement distance calculation value of the material that actually moves with acceleration to find the acceleration rate pattern of the material movement speed and calculate the acceleration rate, The moving distance of the material is corrected based on the acceleration rate.

[Effect]

The cutting control device according to the present invention corrects the moving distance of the material using the calculated acceleration rate, thereby eliminating variations in the tail end crop length caused by changes in rolling speed and lead rate setting, and eliminates variations in the tail end crop length caused by negative operation. The tail end of the street can be cropped.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) to (5) and (7) to (13) are the same as in FIG. (6) is the material tracking position measured from the count value by the distance counter circuit (8), (1
0 is a time counter circuit that counts the time until the material (5) reaches the tail end detector (1) from the position of the length measuring roll (3), and (15,) is a time counter circuit that counts the time until the material (5) reaches the tail end detector (1) from the position of the length measuring roll (3). This is a gate that starts time counting and ends the time counting when the detection signal of the tail end detector (1) is input.

Next, the operation of this embodiment will be explained based on the above configuration.

From when the material (5) passes through the length measuring roll (3) is detected by the tail end detector (1a) installed immediately after the length measuring roll (3) until it reaches the tail end detector (1). The number of pulses is measured by the distance counter circuit (8).

On the other hand, the time during that time is counted by the time counter circuit (14). At that time, the material (5) is being conveyed at a speed (l+α)V+ which is a sufficient lead over the rolling speed, so when the tail end is detected by the tail end detector (1), the value of the distance counter circuit (8) is The predetermined distance gIL is not counted and is in the state of material (6).

Here we consider three cases of first order.

In the case of ■ in FIG. 2, that is, in this case, the material speed is equal to the measuring roll exit speed when the tail end of the material is detected by the tail end detector (1).

In the case of ■ in FIG. 2, that is, in this case, the material speed has reached the 'IA length roll exit speed before the tail end of the material is detected by the tail end detector (1).

In the case of ■ in Figure 2, that is.

In this case, when the tail end of the material is detected by the tail end detector (1), the material speed has not yet reached the measuring roll exit speed. .

What is each acceleration rate α in the cases of ■, ■, and ■ above?

Also, T=t2+t.

t2=T-t.

In the case of (2), find the acceleration rate α in each case as in (2), and use this acceleration rate α to calculate the distance counter circuit (8) of the material (5).
By correcting the value of , accurate material tracking is achieved. Also, by determining the acceleration rate α, variations in the tail end crop length due to changes in rolling speed and lead rate setting changes are eliminated.

The tail end crop can be cut according to the crop L+ set by the operator.

〔Effect of the invention〕

As described in H below, according to the present invention, the acceleration rate of the material movement speed caused by changes in the rolling speed and changes in the setting of the lead rate is detected by determining the movement distance of the material, the time required for movement, etc. At the same time, the moving distance of the material is corrected using this acceleration rate, so crop cutting can be efficiently controlled without the need for the operator to adjust the crop length in response to speed changes and lead rate setting changes. , there is an effect that crop cutting can be performed with high precision according to an arbitrary tail end crop length setting value.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of the cutting control device of the present invention, Fig. 2 is an explanatory diagram showing changes in the acceleration rate of each material speed, and Fig. 3 is a block diagram showing the configuration of the conventional crop cutting control device. It is a diagram. In the figure, (1) is the tail end detector, (2) is the crop shear,
(3) is a measuring roll for line speed detection, (4) is a pulse transmitter, (8) is a distance counter circuit, (12) is a crop length correction setting circuit, and (13) is a comparison detection circuit. , (14) is a time counter circuit. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 2 Figure 3

Claims (1)

[Claims] A tail end detector for detecting the tail end of the material conveyed on the rolling line via a measuring roll for detecting line speed is installed at a predetermined distance from the roll and in front of the crop shear. A distance counter circuit that counts the output of the pulse transmitter connected to the roll from the time the detector detects the tail end and calculates the distance from the material tail end to the crop shear based on the counted value, and the material tail end that needs to be cut. A crop length setting circuit that presets the crop length of the cropper compares the distance calculation value with the crop length setting value, and when the distance calculation value reaches the crop length setting value, outputs a tail end crop cutting command to the crop shear. In a cutting control device equipped with a comparison detector, the pulse transmitter output is counted by the distance counter circuit from the time when the tail end of the material is detected passing from the roll to the time when the tail end is detected by the tail end detector, and the output of the pulse transmitter is counted by the distance counter circuit, The movement distance change is calculated, and the time required for the movement of the tail end of the material is measured using a time counter circuit, and based on the movement distance change calculated above, the movement time measurement value, and the preset material speed change value. The acceleration rate pattern of the material speed is specified by comparing the magnitude with the calculated moving distance of the material, the acceleration rate of the material speed is calculated in the distance counter circuit according to the pattern, and the acceleration rate is calculated in the distance counter circuit according to the acceleration rate. A cutting control device characterized in that it corrects a material movement distance calculated by.