SU1258541A1 - Automatic control system for tensioning a strip - Google Patents

Description

The invention relates to the automation of metallurgical production and can be used to automatically adjust the tension between the cells of a continuous rolling mill strip and a hot rolling mill.

The purpose of the invention is to improve the quality of regulation and reduce the possibility of creating an emergency situation when the strip enters the interspace between gaps. .

Fig. 1 shows a block diagram of an automatic tension control system 5 in Fig. 2, a block diagram of a moment calculation unit; FIG. 3 is a block diagram of the control unit.

The system for automatically adjusting the tension of the strip 1 (Fig. 1) in the interspace between the i- and the cage and the (1 + 1) -th cage, contains a loop holder 2 driven by a DC motor 3, a current sensor A, a moment regulator 5 , the controller 6 of the end positions, the unit 7 for the calculation of the moment, the inputs of which are connected to control devices (not shown) of width 6; thicknesses of the band and specific tension 6 loop 8 regulator, speed regulator 9, lift-up angle sensor 10, control unit 11, the inputs of which are connected to the outputs of the rolled stock sensors in (/ -1) -th i and (1 +1) -th cells (not shown), double integration unit 12, the information input of which is connected to the current sensor 4, and the control input - with the control unit 11, limitation unit 13, comparator 14, the first input of which is connected to the output of the block 12 double integration, the second through the restriction node 13 with the sensor 10 for the angle of lifting the loop rod ate, and the output is connected to the control unit 11, the output of the angle-raising sensor 10 of the looping holder / is connected to the corresponding inputs of the loopback regulator 8, the limitation unit 13, the final position controller 6 and the torque calculation unit 7, the other inputs of which are connected to the corresponding outputs of the block 11 management

The moment calculation unit (Fig. 2) contains three multipliers 15-17, an adder 18, two adjusters 19 and 20, and a switch 21. At the output 15 of the multiplier, a signal is generated that is proportional to the cross section and the weight of the strip between

S

0

five

0

five

0

five

0

five

the cell gap, the multiplier 16 calculates a given tension in the band, and the multiplier 17 forms a linearized indifferent characteristic. The knob 19 enters the value of the unbalanced moment of the looper. In adder 18, the three components are summed up, which determine the required torque on the engine of the loop holder, namely the moment from the weight of the strip in the gap, the unbalanced moment of the loop holder and the component going directly to the creation of tension. The sum of these components determines the moment of the looper motor.

In the initial position, the switch 21 connects the output of the unit to the setting unit 20, which determines the maximum moment of the looping holder. Thus, until the looper comes into contact with the strip, its moment is limited to the maximum value, which allows the endpoint adjuster 6 to rise positions for working with the tempo defined by the task.

The control unit 5 (Fig. 3) contains setting units 22 and 23 of the maximum and working angle of ascent of the looping holder, intensity setting 24, key 25, element 2I – NE 26 and the LV-trigger 27,

The unit works as follows.

When the strip enters the interspace, the sensors for the presence of rolled are triggered and a logical O signal appears at the output of element 26. At that, a command is given to enable block 12 to operate, key 25 closes, and trigger 27 remains in its initial state. At the output of block 11, a signal jjp appears corresponding to the working angle of the ascending loop of the looper, and a linear increase signal |) that determines the task of block 6 for ascending the looper. At the moment of contact with the strip from the comparator unit 14, logical 1 arrives, which switches the trigger $ 27 to a single state. The controllers 8 and 9 of the hinges and speeds are commanded to put them into operation in the interstand tension mode.

312

The automatic tension control system works as follows.

In the initial position, when the rolled nojiocbi is not present in the gap, the loop controller 8 is turned off, the maximum voltage at the output of the moment calculation unit 7 does not limit the output of the regulator 6 to the end

position of the looper, to the input of which from block 11 of the control signal & corresponding to the initial lifting angle, and to the second input the signal p from the sensor 10 of the angle of ascent of the looper.

The end position adjuster unit 6 of the looper operates in the mode of maintaining the looper in a predetermined position. The looper is in its original position, lifted 5-10 mm above the supports and ready to work. When entering a strip in the interskeleton gap, the gauge of the presence of rolled metal in the cage x 0-1) -th, and (| +1) th The control unit 11 logically processes the signals of the presence of metal II at the moment when the strip enters the (i + i) -io stand begins linearly to increase. .gilting the task of jb angle-lifting of the pet-holder. Regulator 8 of the loop despite the fact that at its input is in; i1etts signal set the working angle | J is not enabled and there is no control sigal on its OUTPUT. The regulator of the 6 final positions, the operation and the mode of maintaining the preset angle, begins to raise the holder for a given tempo.

Block 12 double integration solves the equation.

 Tr.

d- CHHH de, 3 - the total moment of inertia of the engine and looper;

 - lifting angle of the looper;

motor current P (tledder;

coefficient of proportionality;

unbalanced moment of the looping holder, the moment of training.

M, p 5

ten

15

20

0

The values of M working their lift angles of the looping holder can be assumed constant.

In the initial position, the integrators of the block 12 are in the initial conditions of integration by the command from the control block 11. At the moment of entering the (1 + 1) -th stand by the command from the control block 11, the block 12 is double integrating, to the input of which a signal arrives proportional to the current of the engine, and the constants M,. p

Mc COS p are set inside it, begins to solve the equation of motion of the looper. At the output of block 12, a simulated signal appears, proportional to the angle of ascent of the looper. This signal at the comparator 14 is compared with the actual lifting angle of the hanger. If the pet trap does not come into contact with the strip, then. the signals arriving at the comparator should be approximately equal, and at its output

5 the logical signal O is present. At the moment of contact of the looper with the strip, its movement slows down, and the angle taken from the double-integration block 11, by the appearance of static current, on the contrary, starts to grow faster, the Comparator reacts to this change in the ratio and its output a sigal logical 1 appears, which stumbles into the control unit. On this signal, the control unit gives the command to activate the loop B regulator and the moment calculation block 7 in operation. The loop controller starts

0 to generate a correction signal in the drive speed controller (1-1-1) of the th stand in order to maintain the looping holder in a given working angle. For this command, the calculation unit can

5 Menta also enters the work. On - its output a signal appears, limiting the output of the regulator 6 end positions at the level corresponding to the moment required

0 to maintain the looper at a predetermined specific tension. The normal operation of the control system begins. The looper supports the specified specific gravity, and the loop controller, acting on the speed controller of the stand, maintains the angle of elevation of the loop holder at the predetermined level.

In case a large loop and looper is formed during refueling, rising to the working angle does not make contact with the Soi strip, then the regulators are activated by limiting the voltage increase t3, proportional to at the second input of the comparator and since the angle modeled by block 12 continues to increase), the comparator 14 is triggered. A logical 1 appears at its output and a control signal is turned on in the control unit. loops on fixes

form a signal for its cleverness, and the looper, lifting, comes into contact with it and begins the process of tension control, similar to that described.

Thus, the use of a double integration unit, a restriction node and a comparator. in conjunction with the proposed linkages, it ensures the timely inclusion of the regulators into operation and thereby improves the quality of the automatic tension control system, and also reduces the possibility of creating an emergency situation during refueling of the strip with slack.

Scream

 17

From dsrmt / uHof rental

Fi & .1

kjiemo ()

VyhoZ

Editor O. Golovach

Compiled by A. Sergeev

Tehred A. Kravchuk Proofreader S. Shekmar

Order 5061/10 Circulation 518 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035 Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

FT4

Fi.Z

Claims (1)

AUTOMATIC STRAP TENSION CONTROL SYSTEM, comprising a loop holder with a drive from a DC motor, a torque calculation unit, a lift angle sensor, a control unit, a current sensor, loop torque, speed and end positions of the loop holder connected to the torque controller, the output of the torque calculation unit is connected with the input of limiting the output of the regulator of the end positions of the loop holder, the input of the speed controller of the drive of the rolling stand is connected to the output of the loop controller, the output of the angle sensor the holder holder is connected to the inputs of the moment calculation unit, loop controllers and end positions of the looper holder, the control unit is connected by its outputs to the moment calculation unit, loop controllers and end positions of the looper holder, characterized in that, in order to improve the quality of regulation and reduce the possibility of creating an emergency situation when the strip enters the inter-cage space, it is equipped with a restriction unit, a comparator and a double integration unit, the information input of which is connected to the sensor ka, and the control unit — with the control unit, the first input of the comparator is connected to the output of the double integration unit, the second — through the restriction unit — to the loop angle sensor, and the output is connected to the control unit. V 1258541