SU751462A1 - Apparatus for regulating coiler tension - Google Patents

Description

(54) DEVICE FOR REGULATING TENSION

ON THE ROLLER

one

The invention relates to the field of metal forming and can be used in the production of low-grade steel.

A device for adjusting tension on a coiler is known, which contains tension sensors, control units, additional metal tension control loops {.

This device is very difficult, which reduces reliability and does not provide the necessary adjustment accuracy.

It is also known a device for adjusting the tension on the coiler, containing a series-connected motor of a bar, a coiler, a controlled converter, a current controller, a speed controller and a current limiting unit during winding, incremental speed sensors of the last stand of the mill and a coiler, a reference source 20 mill voltage, a unit for obtaining a derivative of speed, and a programmable multivibrator.

The disadvantage of this device is that the capture and winding of the front end occur by chance, which leads to a decrease in the grade of the riots.

The purpose of this invention is to improve the quality of the winding.

This goal is achieved by the fact that the device is equipped with a metal presence sensor in front of the reel drum and a control unit for error matching along the way, the first input of which is connected to the output of the incremental speed sensor of the winder, the second input to the output of the metal presence sensor in front of the coiler torus of speed.

The drawing shows a block diagram of a device for adjusting the tension on the coiler.

The device comprises a motor 1, a spinning drum 2 which rotates and connected to the output of a controlled converter 3, the control system of which consists of a current regulator 4, a speed regulator 5 and a winding current limiting unit 6.

A source 7 of the reference mill voltage is connected to the input of the speed controller. The input of the current limiting winding unit is connected to the output of a programmable multivibrator 8, the input of which is connected via block 9 to the output of the incremental speed sensor 10 of the last stand of mill I, sitting on the shaft of the rolling motor 12, powered by the converter, to the control system 13, which input

connected to the output of the source 7 of the reference voltage of the mill.

The drive control system of the winder also includes a metal presence sensor 14 in front of the winder, the output of which is connected to the first input of the error control unit 15 along the way, the second input of which is connected to the output of the incremental sensor 16 of the speed of the winder installed on the motor shaft of the winder 1, and the output The control unit 15 for processing by the mismatched on the way is connected to the input of the speed controller of the winder control system.

The device works as follows.

The winder drum consists of individual fingers, evenly spaced along the inner radius of the winding. In order to securely grip the front end of the rolled stock and its winding, it is necessary at the time of the pickup to install the reel so that the front end of the rental falls between the fingers and is gripped by them, which ensures reliable front end winding.

The drum and metal move synchronously, i.e. the speed of the drum and the metal are related by

Lbar -: 60 rpm,

L- to,

where Lbar is the speed of the winder drum,

rpm;

Y - metal speed, m / s; L is the fixed distance traveled by the metal; / С - the number of fingers in the drum

winders.

In order to reliably capture the non-distal end during the passage of the metal past the sensor 14, the impulses from the output of the sensor give a command to compare the counter code of the control unit 15 for misalignment of the path filled with the frequency from the output of the incremental encoder of the coiler speed 16 with a pre-selected code; 2 winders. JB in case of mismatch of the codes at the output of the control unit of the misalignment of the state, a pulse arises, the duration of which is directly proportional to the code difference. By entering the coiler speed controller 5 input, it nodrazgat it so that by the time the metal approaches the drum 2 coiler meets it in a strictly fixed position and at a predetermined speed. There is a capture of the front end of the metal with the fingers of the drum 2 winder.

When the speed of the last mill stand changes during the winding process, the pulse frequency at the output of the incremental sensor 10 located on the motor shaft at the mill stand is changing.

This change is fixed by block 9 to obtain a derivative in discrete automatic control systems, and the output of block 9 is a code whose value is directly proportional to the value of the derivative of the speed of the mill stand. The programmable multivibrator 8, to the input of which the code from the output of block 9 is fed to obtain a derivative in discrete systems, converts it into pulses.

The command for the formation of a pulse comes from block 9 after a certain measurement cycle.

The impulse from the output of the multivibrator 8, which enters the input of the current limiting unit 5 during winding, disconnects it from the speed controller 5 of the winder drive control system, thereby closing the speed control system. The winder engine is subdivided.

The time of subrampling depends on the pulse duration of the programmable multivibrator 8.

At the end of the pulse, the coil current limiting unit 6 is again connected to the speed controller 5, and the coiler drive control system starts to work again to maintain the coil current constant.

The application of the proposed device allows to increase the quality of the reeling and eliminate the possibility of non-grip of the front end of the rolling mill.

Claims (2)

1. USSR author's certificate No. 463492, cl. At 21C 47/00, 1973. 2. USSR author's certificate in application number 2515229 / 25-27, cl. B 21C 47/00, 1978.