SU531577A1 - A device for controlling the electric drive of the volatile cutting mechanisms of rolling mills - Google Patents

Description

one

The invention relates to control systems for the automated electric drive of the rotating volatile cutting mechanisms of pipe and section-rolling Stano1B.

A device for controlling an automated electric drive comprising a motor whose input through a converter is connected to an output of a current controller is known, the input of a current controller is connected to an output of a current sensor and a speed controller, the input of the latter is connected to an output of one or several speed sensors, as well as output digital-to-analog Converter 1. However, this device does not provide the required quality of the end of the product being cut because of the difference in speed of the cutting-off volatile mechanism and cut from Delhi

Closest to the described invention by its technical essence and the achieved result is the control circuit of the flying saw 2. This control circuit contains a motor, the input of which through the converter is connected to the output of the current regulator, the input of the current regulator is connected with; the output of the current sensor and the output of the speed of the torus, the input of the latter is connected to the speed sensor of the flying saw and the speed sensor of the contact roller, as well as to the output of the digital-to-analog converter, whose input

2

associated with the position sensor of the flying saw and the sensor position of the contact roller.

A significant disadvantage of the known flying saw control scheme is that

it does not provide a high-quality end face of the product being cut and does not contribute to an increase in the durability of the cutting tool, since at the moment of cutting the speed of the product and the cutting mechanism may be different.

The purpose of the invention is to obtain a high-quality end of the product with minimal cutting losses, as well as to increase the durability of the cutting tool (increase its useful life). This is achieved by entering

the speed controller is connected via a switch to the multiplier output, the second input of the switch is connected to the output of the controller, one input of the multiplier is connected to the output of the steering angle converter, for example, a selsyn, and another input of the multiplier is connected to the output of the speed sensor

FIG. 1 shows a block diagram of the proposed device; pas figs. 2 - the law of change

the speed of movement of the tool rail in the zone.

The rotating flying cutting mechanism 1 is set in motion by the engine 2, which is powered by an adjustable

converter 3. converter input 3

connected to the output of current regulator 4, the inputs of which are connected to the outputs of the pei-speed controller and current sensor b. The speed controller inputs are connected to the sensor / speed output of the volatile cutting mechanism i and via keys B and Y, respectively, with the outputs of the iO position and multiplication controller 11, and also to the output of the speed sensor 12.

The inputs of the controller 1 and the field are associated with the output of the sensor 1b of the pulses of the follower roller 14 and the output of the sensor of the emulsions of the volatile cutting mechanism. The inputs of the multiplier i 1 are connected to the sensor / speed of the volatile cutting mechanism and to the functional rotational angle 1b of the angle of rotation, for example, the selsyn. Key management 8 and Y is carried out by command commander 1 /.

The device works as follows.

In order to obtain a high-quality end face of the product being cut, it is necessary that, when cutting, the horizontal component of the cutting tool motor speed (UGOR) at all points of the cut zone should coexist with the speed (ed) of the split product (Vrop 1 / ed). From this requirement, it follows that the circumferential speed of movement of the cutting tool in the cutting zone must be changed by law;

1 / OCD-1 / ed / POPs.

The angular speed of the cutting tool should be changed according to the law:

,

Rcos

where R is the radius of movement of the cutting tool; VIISA - the speed of movement of the cut

products;

F - the current value of the angle of rotation of the cutting tool in the cut zone.

In order to obtain the required law of changing the speed of the cutting tool in the cutting zone with a key 8 controlled by commander 17, the position adjuster 10 is disconnected and a rotation angle function 16 is connected to the input of the speed adjuster 5 via a multiplier 11 by key 9. When disconnecting the position adjuster 10 from the speed regulator input b, the current mismatch information along the path of the product and the cutting tool is saved. After the product has been cut, the controller 17 switches the key 9, which disconnects the output of the multiplier 11 from the speed controller 5 and connects the output of the position controller 10 to the speed controller 5. Accumulated during the cutting of the product by the regulator 10 position information about the mismatch of 1 way of the product and the cutting tool is entered and the regulator about the speed to

the beginning of the next cut, which ensures the cut of the product to the specified nominal length.

laKHiM way, the proposed device allows to ENHANCE the quality of the end face of the product being cut and to exclude subsequent operations, for example, with the need for subsequent pipe trimming, as well as to increase the durability of the cutting tool and, as a result, reduce the unproductive mill downtime.

Claims (2)

1. R. A. Kulessky, V. A. Shubenko “Electric Drives of Direct Current with Digital Control, Moscow, Energiya, 1973, p. 14 (analog). 2. R. A. Kulessky, V. A. Shubenko “Electric Drives of Direct Current with Digital Control, Moscow, Energiya, 1973, p. 20 (prototype). 1L P U y. / B 7 15