JPS61129216A - Automatic sheet thickness control device for rolling mill - Google Patents

Abstract

PURPOSE:To improve sheet thickness accuracy by providing a roller and pulse transmitter for measuring the rolling speed, etc. of a rolling material and measuring the change value of a roller diameter via a gap sensor. CONSTITUTION:The speed of the rolling material 1 is measured by pressing directly the roller 3 to the material 1 on a roller such as deflector roller 2. The pulse transmitter connected via coupling to the shaft end of the roller 3 generates the pulse proportional to the revolution of the roller 3 to measure the speed of the material 1. A gap sensor is provided to a frame 10 in order to correct the diameter of the roller 3 changing with wear. A seat for detection is disposed to the bearing 6 of the reflector roller 2. The change value of the diameter of the roller 3 is determined from the change of the measured gap value of the gap sensor, by which the exact speed of the material 1 is obtd. The sheet thickness accuracy is improved by the above-mentioned method.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an automatic plate thickness control device for a rolling mill, and particularly to a device for controlling the plate thickness of a rolled material by measuring the speed or length of the rolled material using a roller. This invention relates to improvements in equipment for

[Background of the invention]

As specified in Japanese Patent Publication No. 50-17309, thickness gauges and rotating rolls are installed on the inlet and outlet sides of the rolling mill to control the thickness of the rolled material, and the number of revolutions of the rotating rolls is measured.
A method for controlling the ratio of these two rotational speeds to be constant is known.

To measure the rotational speed in this case, it is common to install a pulse oscillator that generates pulses proportional to the rotational speed.

FIG. 5 shows a conventional rolling material speed measuring device.

In the above explanation, the rotation speed of the α-ra is measured, but since the roller diameter is a small value, the speed can be determined.

The roller 3 is installed on the differential V roller 2 and rotates in contact with the rolled material 1. This rotation is transmitted to the pulse generator 5 via the shaft 4, and the pulse generator 5 generates pulses proportional to the rotation speed. Here, by measuring the diameter of the roller 3, the speed of rolling material can be reduced.

However, in order to improve measurement accuracy, the row 23 is made of synthetic resin or the like in order to minimize the moment of quality.

However, since this roller 3 is used by being pressed against the rolled material, the outer diameter becomes smaller due to wear and heat, and the initially set pulse changes, making control impossible and deteriorating the accuracy of the plate thickness.

Therefore, if the operator uses the V-shape frequently, it becomes necessary to measure the roller diameter and adjust the number of pulses.

[Purpose of the invention]

An object of the present invention is to provide a device for controlling the thickness of a rolled material by directly or indirectly measuring the absolute value or change value of the outer diameter due to wear and heat of the roller and manually inputting the measured value to the control device. It's in particular.

[Summary of the invention]

The present invention relates to automatic thickness control of rolled materials, particularly thickness gauges for measuring the thickness of rolled materials on the entry and exit sides of a rolling mill, and rollers and rollers for measuring the speed or length of rolled materials. This control device is equipped with connected pulse transmitters, and is characterized by directly or indirectly measuring the absolute value or change value of the roller diameter and inputting it to the control device to control the thickness of the rolled material. shall be.

FIG. 6 shows a schematic layout of an automatic plate thickness control device that measures the speed of the rolled material and controls the thickness.

The basic principle of this control is the constant quality flow law and the mask 0-AG
It is called C (Auto Gauge Control). It is characterized by directly controlling the reduction system by calculations based on this principle, and is composed of the following equipment.

1) Thickness gauges on the entry and exit sides 2) Rollers and pulse transmitters for measuring the speed of rolled material 3) Control device 4) Rolling down system The rolling down system is a hydraulic system using high-precision, high-response electro-hydraulic servo valves. Reduction is normal. This block diagram is shown in FIG.

The automatic plate thickness control of the rolling mill uses an electro-hydraulic servo system with a feedback loop using a displacement detection mechanism.

Next, the principle of operation will be explained.

Mass flow AGC is based on the basic concept that the amount of rolled material flowing into and out of the rolling mill per unit time is the same.

In a cold rolling mill, it is safe to assume that the width of the strip does not change in practice, so the thickness of the strip at the entrance and exit sides and the length per unit time are determined by the following formula.

This will be explained using Figure 8.V+=v... (1) L+
xT+ = L, x'p, ,,, (2) Here, V: Volume, L: Length, T: Thickness i, and 0: Subscript indicating entrance side and exit side, plate thickness T on the entrance side. Considering that it is equal to the sum of thickness G and deviation ΔG1, LI (GI+ΔG r ) L−T−= L, G−
...(3)T. If the set values G and Ll are chosen to be equal, G++ΔG+=L−...(4), and the sum of the input side plate thickness setting G+ and the deviation ΔGI is equivalent to the length of the outlet side. Become.

Specifically, the pulses from the inlet pulse oscillator are counted up to the outlet plate thickness set value G, and when the pulses become equal to the set value L1, the outlet pulse count is turned off. The deviation ΔG1 measured by the thickness gauge becomes a correction value for the plate thickness, and the rolling reduction is adjusted.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The speed of the rolled material 1 is usually measured by directly pressing it against the rolled material 1 on a roller such as a de7 nocturnal roller 2 or the like.

The roller 3 is the roller and is connected to a shaft 8 having a tapered portion. This taper prevents misalignment and improves detection accuracy.

The shaft 8 has a bearing 11 built into the frame 10.
．． The pulse transmitter 5 is supported by the coupling 13 to 12.
is connected to.

Therefore, the rotation of the roller 3 is transmitted to the pulse generator 5, and the roller 3, which generates pulses proportional to the rotation, is pressed against the rolled material 1 by the cylinder 9 installed on the frame 7 during rolling, and measures the speed. , when not measuring, cylinder 9
It has a structure that allows it to be lifted and fixed.

Since the material of the roller 3 must be a lightweight material such as synthetic resin, it is an unavoidable problem that the outer diameter changes.

Therefore, the present invention has a frame V-frame 10 as shown in FIG.
A gap sensor 4 is attached to the gap sensor 4, and the seat 15 of the object to be detected is attached to the bearing 6 of the deflector roller.

If the gap sensor 4 is initially adjusted with the roller 3 in contact with the rolled material l, the outer diameter of the roller 3 after a certain time of use is φd from FIG. 4, then GL φd=4)−□ ・・・(5) Here D
: Roller diameter after wear L: Distance between frame fulcrum and roller t Near V - Arm fulcrum and gap sensor distance G: Gap after wear D, L, and t are fixed values, and the roller diameter after wear is the gap G. It can be obtained from the measurement K.

Input the measured value of this gap sensor 14 to the control device,
The roll diameter is calculated using equation (5), and the variation is corrected.

Thereby, it is also possible to correct the difference in roller diameter between the entrance and exit sides.

In the present invention, the roller diameter is measured indirectly by the gap sensor 14, but although it is not shown in the drawings other than this embodiment, it is also possible to use a cell scene using an angle sensor, a rack, and a pinio. It has a similar effect.

〔Effect of the invention〕

According to the present invention, by installing a gap sensor, it is possible to indirectly measure the roller diameter, input it over time, and correct the pulse transmitter, making it possible to accurately measure the speed and improve plate thickness accuracy. It is possible to produce rolled material with good quality.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention, Fig. 2 is a cross-sectional view of the roller portion, Fig. 3 is a side view of another embodiment of the invention, Fig. 4 is a calculation diagram of the roller diameter, and Fig. 5 is a side view of an embodiment of the present invention. The figure is a side view of a conventional rolling material speed measurement device, Figure 6 is a schematic layout of mass 70-AGC, Figure 7 is a block diagram of automatic plate thickness control, and Figure 8 is a rolling material on the entry and exit sides. FIG. 3 is a diagram showing the relationship between the thickness and length of the material. 1... Rolled material, 3... Roller, 5... Pulse transmitter.

Claims (1)

[Claims] 1. An automatic plate thickness control device for controlling the thickness of the rolled material, comprising: a thickness gauge for measuring the thickness of the rolled material provided at the entrance and exit sides of the rolling mill; A roller for measuring speed or length, a pulse transmitter connected to this roller, and directly or indirectly measuring the absolute value or change value of the diameter of the roller and inputting it to the control device, 1. An automatic plate thickness control device for a rolling mill, comprising means for controlling the thickness of a rolled material.