SU1150617A1 - Device for controlling the rolling mill shears stop - Google Patents

Abstract

A DEVICE FOR CONTROLLING A KENCHER MILLS KICKER, containing a shaft-number sensor connected by an input through a gearbox with an electric drive of the stop, and an output - to the input of the amplifier and the first information input of the comparison unit connected to the tire with the reset input of the device; a switch connected by an output to an input of a first digital display, characterized in that, in order to improve the accuracy of the device and to expand the field of application, 3 of them are entered into a block of starters, a mode key, a block of movement commands, su mmator, remote control key, second digital scoreboard, correction calculation block, temperature evaluation unit, first and second control panels, analog-digital converter, normalization unit and test-loop sensor connected by an output to the input of a normalizing unit connected by an output to an analog-digital converter input, connected to the information input of the temperature estimator, connected by the fault input to the reset bus, and the output to the first information input of the correction block connected to the second information the main input to the output of the first panel and to the first input of the adder, the third information input to the output of the second panel, and the output to the second input of the adder connected to the first output of the input Reference point 5 of the comparator, the second output to the second digital display, and the SP by the third output — with the first information input of the motion command block, connected via the information output input to the amplifier output (and the output — to the input of the mode key connected by the first output to the remote control input, and th output - to the first input of the starter, a second input connected to the output of the control key Distan insulating and output - to the input of the stop of the actuator.

Description

The device is related to automatic control and can be used in rolling or other production where the technological operation of the heated metal is performed repeatedly on a part of a given length using scissors equipped with a moving stop, in particular on blooming, thick sheet rolling mills. A device is known for controlling the position of a linear moving object with an optical beam ij. Although the hot metal cutting shears stop belongs to this class of objects, the device cannot be used due to the relatively small footing dimensions due to shock and vibration, significant air pollution, high metal temperature, closest to that proposed by the technical essence and achieved The result is a remote control device used in rolling production by moving the abutment to the required position in which an industrial television installation or a digital display is used. ator stop position. The device contains an electrically movable stop, a shaft-number sensor, an amplifier, a comparison unit, a switch, a display board. It performs the functions of measuring the position of the stop, comparing the measured and set positions and displaying the deviation from the task to the operator. The operator., Taking into account the deviation value, corrects the position of the abutment using the remote control key zj. The main drawbacks of the device are incomplete automation of control of the stop (only the measurement of the position of the stop and the display of the measurement result are automatically performed), low cutting accuracy due to the fact that the operator when installing the stop using the remote control device only takes into account the metal temperature. After cooling, it turns out that the length of the finished products does not correspond to the specified length. Usually on rolling 17: 2 mills, the actual length is greater than the target. The aim of the invention is to improve the accuracy of the device and the expansion of the field of application. The goal is achieved in that a device for controlling the shear stop of a rolling mill, which contains a shaft-number sensor connected by an input through an electric reducer to the stop, and an output to the amplifier input and to the first information input of the comparator unit connected by a reset input to the bus Reset device, and an output to the input of the switch connected by the output to the input of the first digital display, a starter unit, a mode key, a movement command block, an adder, a remote control key, a second digital scoreboard are entered. a correction calculation unit, a temperature evaluation unit, a first and a second console, an analog-to-digital converter, a normalizing unit and a temperature sensor connected by an output to the input of a normalizing unit connected by an output to an input of an analog-digital converter connected to the information input of a unit for estimating temperature, connected by a fault input with a reset bus, and the output - with the first information input of the correction calculation block connected by the BTopbJM information input to the output of the first console and to the first input of the adder, mp the second information input to the output of the second panel, and the output to the second input of the adder, connected to the first output with the input of the Reference block of the comparison unit, the second output to the input of the second digital display, and the third output to the first information input of the motion command block connected the second information input to the output of the amplifier, and the output to the input of the mode key connected by the first output to the key input, remote control, and the second output to the first input of the starter unit connected by the second input to the output the remote control key and the output to the electric drive input of the stop. The stop control device provides automatic installation of the stop to the specified position, with

the setpoint (task) 1 for the length of finished products is adjusted taking into account the average temperature i of the metal entering the shears and the steel grade:

L; L., u% o.L; .t, (1)

where UL is the adjusted setting;

0 (l, is the linear expansion coefficient for w and steel grade.

The device allows the scissor operator to select one of two modes of operation: automatic or remote. To monitor the work

The devices in the automatic mode and for the implementation of the remote mode serve two digital scoreboards that display the given length it, the products and the actual distance Lrtj from the cutting plane to the stop.

FIG. 1 shows a block diagram of the device for controlling the stop, in FIG. 2 - movement command block diagrams.

The device contains (Fig. 1) electric drive 1 stop, gear 2, sensor Shaft digit 3, amplifier 4, block 5 compare switch 6, first digital board 7, block 8 movement commands, adder 9, key 10 mode, block 11 starters, a remote control key 12, a second digital display 13, a correction calculation unit 14, a first remote control 15, a second remote control 16, a temperature evaluation unit 17, an analog-to-digital converter 18, a normalizing unit 19, a temperature sensor 20.

Blocks 1-7 devices are structurally similar to the prototype. Blocks 1 and 20 are a radiation pyrometer, for example, an IPAA system. The block 17 for estimating the average temperature of a piece is built on the basis of a first-order relay-exponential filter. The consoles 15 and 16 of the input LJ, o, | q are built identically on ten typed packet switches, the number of which corresponds to the randomness of LO numbers (U 14 Correction calculation block 14 is built on elements that allow the multiplication of three numbers represented in binary code. Block 8 move commands

(Fig. 2) consists of a register 21, the first element 22 NOT, the first elements AND (23 (- 23), the second register 24, the first element OR 25, 5 the second element 26 NOT, the second elements AND (27f- 27), the third elements I (28 - 28g)), third elements NOT (29 | - 29p), fourth elements AND (30), fourth elements NOT (31 | - 31 n), second element OR 32.

The control unit emphasis works as follows.

Specified length of finished products

5 (sheets, slabs, blooms, etc.) are entered by the cutting operator through the console 15 before cutting begins. The linear spacing coefficient of the metal entering the cutting site is entered by the operator through the console 16 for inputting the linear expansion coefficient. The temperature of the front burst is controlled by the sensor 20, the normalizing unit

5 19 and analog-digital converter 18 .. The average temperature of the roll is estimated along its movement along the roller table in the area of the sensor 20. In this case,

. Block 17 uses an exponential relay filter:

., (-.) - ti; M), ecAHlC- Uv, 2) u.snii-TsU,

where (), tCi) is the instantaneous and current average temperature value for the I -th time discretization step, Sig "iCi) -t (") l is a sign function,

y, p are known coefficients. The filter is put into operation at the moment when the head part of the roll breaks through the zone of sight of the sensor and is turned off at the moment of passing the needle part. The current average BC) / corresponding to the last reading is an estimate of the average temperature of the roll. It is memorized by block 17.

The correction A C to the operator-specified length L (j, of the finished product is calculated by block 14, and the adder 9 determines the corrected task L ju in accordance with the relation (1). Permission to move the abutment to a new position corresponding to l, t,, gives the operator-cutter by swapping the key 10 to the Automatic position. Preliminarily using the scoreboard 13 and it can visually check the correctness of the calculation of the setpoint L "and the deviation (Lm -1ooch). Unit 8 together with the actuators realizes blowing algorithm: (. if bfcjl a o if lL (pL fulua; 1, if (1f-1 | -a. Symbols 1, О, -1 indicate the states of actuators of the actuator: Forward, Off, Back, -a, and the change zone of the Lujt 7 difference corresponds to the Off state , and - control action. Such an algorithm, in combination with a constant speed electric drive, provides optimal performance control of the stop. The movement command block (Fig. 2) works in the following way. It performs random comparison of binary codes of a given L and actual Lf position of the stop and depending on the result compared to and instructs forward, reverse or proceeds to comparison of the next discharge. The comparison starts with the most significant bit, i.e. the digits at the outputs of registers 21 and 24. In this case the following cases are possible:

about 1

ABOUT

1 o

one

in the first case, the high-order bits of registers 21 and 24 contain the number 1. In this case, the OR elements 32 and 25 do not work, and through the elements NOT 31, and Big and the element AND 28 (elements 23 and 27 open, allowing you to compare the digits of the next bit yes, etc. In the second case, the higher bits of the registers 21 and 24 contain zeros, which leads to the similar operation of the elements 23 „, 27 32, 33. 31 ,, 31 28, 23 ,, 27, 27. In the third case it works the l-UIH 25 element and the Back command is issued, which is executed until the high-order digits of the numbers 1, bf match. In the fourth case, the Forward command appears, then eats The element OR 32 is triggered, and, after opening the elements 23, 27, the following bits are compared according to the described scheme. Thus, the algorithm (3) is realized, which provides the maximum speed of

about 1

one

about 1

0

out and set accuracy of installation of an emphasis.

The stop control device allows the cutter, if necessary, to remotely control the stop, for which the key 10 is set to the Remote position, and the states of the actuator block are changed using the key 1 2.

After cutting to the measuring lengths of the next roll, the scissor operator gives the command to feed to the scissors of the next roll and cuts off its front end. In this case, the information in block 17, where the information on the average temperature of the cut log was stored, is erased by the Reset signal.

Information about the actual distance -5 SRI L f between the cutting plane and the stop is formed by blocks 2 - 6. Gear 2 serves to coordinate the movement of the stop with the rotation of the sensor 3 shaft. The latter allows you to control the position of the stop with a 1 mm distinguishability threshold. The angle of rotation of the sensor shaft is converted into a phase-to-reading from the code mask by photocells. A transducer built into the sensor generates potential, parallel forward and reverse binary codes at the output. The parallel binary code in the comparison unit 5 and the switch 6 is converted into a unitary serial code. Table 7 shows the deviation L (V) -C ", for which the signal L y is fed through the input O of the comparison block 5 from the adder 9.

If necessary, the entrance to the origin can be turned off, then | board 7 displays L, i.e. the actual distance from the cutting plane to the stop. The Reset signal to the input of block 5 is supplied by the operator or the adjuster using a special button if it is necessary to zero the board 7.

l

the effectiveness of the stop control device is achieved by increasing the accuracy of metal cutting. So, at the sheet rolling mill, the maximum error of cutting sheets can be reduced from +115 mm according to the prototype (basic object) to + 15-20 mm. This makes it possible to transfer part of the trim to a suitable metal. In addition, the automatic installation of the stop in a predetermined position allows for a reduction in labor costs.

Sdros

Claims (1)

DEVICE FOR CONTROL OF SCISSORS OF THE ROLLING STABLE, containing a shaft-digital sensor connected by an input through a reducer with an electric stop, and an output by an amplifier input and the first information input of a comparison unit connected by a reset input to the device reset bus, and an output to the switch input connected by the output to the input of the first digital display, characterized in that, in order to improve the accuracy of the device and expand the scope of application, it includes a block of starters, a mode key, a block of movement commands, an adder, remote control key, second digital display, correction calculation unit, temperature estimation unit, first and second panels, analog-to-digital converter, normalizing unit and temperature sensor, connected by an output to the input of the normalizing unit, connected by an output to the input of an analog-to-digital converter, connected an output with an information input of a temperature estimator connected to a dump input with a reset bus, and an output with a first information input of a correction calculation unit connected to a second information input to the output of the first console and to the first input of the adder, the third information input to the output of the second console, and the output to the second input of the adder, connected by the first output to the input Reference pointΞ of the comparison unit, the second output to the input of the second digital display, and the third output with the first information input of the block of movement commands connected to the second * information input to the amplifier output, and the output to the input of the mode key, connected by the first output to the input of the remote control key, and the second output to the first input Lok starter, a second input connected to the output insulating Distan control key, and the output - to the input of the stop of the actuator.