SU723519A1 - Device for control of annular furnace bottom - Google Patents

Description

one

The invention relates to the control of a drive with a step mode of operation, in particular, to an improvement of the system for controlling the drive of the hearth of annular heating furnaces used in the metallurgical industry for heating billets before rolling. The invention can most effectively be used to control the drive of the hearth of an annular heating furnace installed in the line of the tube-rolling unit, and in cases where the process conditions require an hour and a change in the corners of the layout of the blanks.

A device is known for automatically controlling an annular heating furnace, containing a selso-sensor, a gearbox and a commander, by means of which the angle of rotation of the hearth of the annular heating furnace is adjusted, as well as the hearth stops after it is rotated. To change the gear ratio when changing the layout of the blanks on the hearth of the furnace, the device uses a gearbox and a kinematic gearbox with a gear wheel, the number of teeth

which is equal to the number of teeth of the ring pitch Such a device allows for adjusting the hearth drive for a certain step size in accordance with the number of stages in the gearbox. It ensures the operation of the furnace with a rotation angle that is placed an integer number of times in the total working angle of rotation from

0 loading axis to furnace unloading axis 11

The drawback of the device lies in limiting the choice of workers, given by the gearbox,

5 and also in the possibility of operating the furnace only with an angle that is a multiple of the total working angle.

The closest to the invention to the technical essence is a device for controlling the drive of the hearth of the annular furnace, containing an amplifier-switching unit, the output of which is connected to the drive motor of the furnace hearth associated with the pulse sensor

5 and the first control unit consisting of the first connected in series first counter, decoder and valve, the output of which is connected to the first inputs of the OR element and the second counter, the second input of which is connected to the second input of the OR element and the second output of the first decoder, and the output through the second decoder - with the second input of the first valve, the output of the element OR is connected to the first input of the first counter and the first input of the amplifying-switching unit. This device provides automatic operation of the furnace hearth. At any corners of the layout of the workpieces, including corners that are not a multiple of the full working angle P between the loading axis and the unloading axis. In this case, the maximum possible number of blanks p stacked with technologically optimal angular step Z can be loaded on the furnace. The system provides processing () of angular steps with ss value, and then testing one compensating step with the value of - + d, where D Z, It allows you to output all the workpieces strictly to the discharge axis 2. A disadvantage of the known device for controlling the drive of the hearth of an annular furnace is that it allows you to work with only one, albeit optimal, angle at any time period otovok. This leads to large losses of time, nor when changing the pick angle, since loading of blanks with a new laying angle can be started only after full unloading of the blanks of the previous batch laid with a different angle. The time losses are on average 10–15 min with each change of the pick angle and are equal to the time required for a non-stop rotation of the furnace to the full working angle 3 from the loading axis to the unloading axis. Since the change in the angle of the layout of the blanks at the hearth of the furnace can occur several times during the working day, this leads to a significant decrease in the productivity of the furnace. The aim of the invention is to expand the field of application of the device. This goal is achieved by the fact that the device contains a trigger and a second control unit, and the second, third and fourth gates, the third counter and comparison and memory elements are inserted into each control unit, the pulse sensor is connected to the first inputs of the fourth gates, the outputs the trigger is connected to the first inputs of the second and third valves of the respective control units, the trigger inputs are connected to the first inputs of the respective elements of the fifth, the output of the OR element of the second control unit is connected to the second input of the amplifier o-switching battery, the second inputs of the second and third valves are connected respectively to the outputs of the first valves and the second outputs of the first decoders, and the outputs - respectively to the first and second inputs of the third counters, the outputs of which are connected to the first inputs of the comparison elements, the second inputs of which are connected with the outputs of the second counters, and the outputs with the second inputs of the memory elements, the outputs of which are connected to the second inputs of the fourth gate, the outputs of which are connected to the second inputs of the first meters. The drawing shows a structural diagram of the device for controlling the drive of the hearth of the ring furnace. The device comprises first and second control units 1 and 2, trigger 3, pulse sensor 4, amplifier switching unit 5, the output of which is connected to a drive motor b mechanically connected via gearbox 7 to the furnace hearth 8 and pulse sensor 4. Each control unit contains the first counter 9 connected in series, the first decoder 10, the first valve 11, the second counter 12 and the second decoder 13, the output of which is connected to the second input of the first valve 11, as well as the OR 14 element, the second and third vents 16 and 17, the fourth valve 15, third counter 18, reference element 19 and memory element 20. The output of the element OR 14 is connected to the first input of the first input section of the first counter 9, the first input to the output of the first valve 11 and the first input of the second valve 16, the second input to the input of the second operation terminal of the second counter 12 pulses to the second output of the first decoder 10 and. to the second & WAY of the third valve 17, the output of which is connected to the second input of the third-stage MA 18, the first input of which is connected to the output of the second valve 16, and the output to the first input of the comparison unit 19, the second input of which is connected to the second input counter 12, and to the output - the second input of the EI of the memory element 20. The output of the memory element 20 is connected to the second input of the fourth valve 15, the output of which is connected to the second input + 1 of the first counter 9. The first inputs of the fourth valve 15 of the control units 1 and 2 are connected to the sensor 4 pulses. The output of the OR element 14 of the first control unit 1 is connected to the first input of the amplifier-switching unit 5, the output of the OR element 14 of the second control unit 2 is connected to its second input. The input U1 of the trigger 3 is connected to the first input (U1) of the memory element 20 of the first control unit 1, the input (VO) of the trigger to the first input (U1) of the memory element 20 of the second control unit 2, the first output 1 of the trigger 3, is connected to the first the inputs of the second and third valves 16 and 17 of the first control unit 1, and the inverse output O with the first inputs of the second and third valves 16 and 17 of the second control unit 2. In the course of operation, a certain number of b blanks, stacked with the technologically optimal angular step, can be loaded on the furnace. The device ensures that the hearth is minus nj -1 angular - steps of magnitude about and then allows for one compensating step of magnitude tf. + & -, where O 4 d i. x (. When setting up the device, before starting work, the first decoder 10 of the first control unit 1 records the number of pulses corresponding to the angular step size of the first batch of blanks and the number of pulses corresponding to the compensating angular step c + e. In the second decoder 13 This unit controls the number 1, i.e., the number of angular steps cx, the furnace hearth. The first decoder 10 of the second control unit 2 records the number of pulses corresponding to the angular step, the next batch of cooking, and the number of impulses In the second decoder 13 of the second control unit 2, the numbers nji-l, i.e., the number of angular steps, the kiln, are fed into the second decoder 13 of the second control unit 2. The device works as follows 3. the memory element 20 is turned on, which puts the first control unit 1 into operation, wherein the trigger 3 is set to the second state and the third valve 16 and 17 of the first control unit 1 for the passage of pulses. On command from the switching amplifier unit, the drive motor 6 of the furnace 8 is turned on and the furnace of the first step of the furnace starts to work. The pulses from the sensor output 4 of the pulses go to the first input of the fourth valve 15 of the first control unit 1 opened by memory element 20 , and from its output - to the input + 1 of the counter 9. When the counter counts 9, the number of pulses corresponding to the step size oC, L is at the output of оС. The first decoder 10 receives a signal that is fed through the first valve 11 to the input +1 of the second counter 12 and through the second valve 16 to the input + 1 of the third counter 18. From the OR 14 element, the pulses go to the input of the EI of the first counter 9 and The first input of the amplifier of the commutating unit 5, connected with the driving motor 6. The engine 6 is turned off, under the furnace 8 is stopped, the first counter 9 is reset to the initial state by a short pulse, and the second 12 and the third counters 18 are entered by the logical unit, and starts counting the worked steps of the size of Upon a command from the control circuit of the loading and unloading machine, the drive motor 6 of the furnace 8 of the furnace is turned on again to turn the furnace to the next step. Next, the process of turning the furnace hearth 8 to the step оС. and counting the number of these steps by the second 12 and third counters 16 is repeated. After counting, the second counter 12 pulses of the next l-1-st step is the value (below 8 the furnace stops, and the output of the second decoder 13 is a signal which, being fed to the second input of the first valve 11, closes it. When the furnace 8 turns next the signal at the output ot of the decoder 10 appears again at an angle. However, the first valve 11 remains closed, and the command to stop the furnace hearth 8, to reset the first counter 9 and to add the logical unit to the second 12 and third 18 meters enters. Under 8pech continuing m movement, with the first counter 9 counting an additional number of pulses corresponding to the value of D. After that, the output of the C + d of the first decoder 10 is a signal that resets the second counter 12 to the initial state at the EA input, and through the third gate 17 The third counter 18 resets to the input of the EUT, preparing both counters for the next cycle of operation. The element OR 14 resets the first counter to zero to the EO input and gives the command to stop the drive motor 6. At the same time, the furnace stops at 8, equal to os + l, output the first workpiece exactly on the axis of discharge. From this point on, the loading and unloading is performed simultaneously. When stopping the bottom for loading the last billet from the batch going with the angle of the OS layout, the reference signal Input 2 turns on memory input 20 of the second control unit 2. In this case, block 2 is put into operation. The trigger 3 at the input of the OUT enters the state O, and the second and third valves 16 and 17 of the second control unit 2 are opened for the passage of pulses. The second and third valves 16 and 17 of the first block i of the control are closed, prohibiting the passage of pulses to the inputs +1 and EI of the third counter 18 of this block, resulting in information on the number of exhausted by this time

angular steps oC., is stored in the counter 18 unchanged until the moment of departure to the unloading axis — the last batch of the batch laid in increments

woo,

From the moment the target signal is given, Input 2 starts the simultaneous operation of two control units 1 and 2,

After turning on the drive motor 6 of the furnace hearth 8, the pulses from the sensor 4 pulses start to flow into the first counters 9 of both control units 1 and 2. When the n sensor 4 pulse arrives, the number of pulses corresponding to the angular step o (,, at the first exit C of the first decoder 10 of the first control unit 1 appears a signal which causes the furnace 8 to stop, reset the first counter 9 and the writing of the logical unit to the second counter 12. In this case, no logical unit is written to the third counter 18, since the second valve 16 is closed

At the end of the unloading, the drive motor 6 is turned on again to rotate the hearth 8. When the number of pulses from sensor 4 is received, corresponding to the difference of angles of about (-1, the output of the first decoder 10 of the second control unit 2 will cause a signal to stop the furnace hearth 8. The first counter 9 stops counting and returns to the initial state, and the second counter 12, the third counter 1B of the second control unit 2, records the unit. Then, the angle turns equal to c - (.)Referring unloading.

Thus, there is a simultaneous independent operation of two control units, in which the first control unit 1 provides for stopping the bottom for unloading blanks through each corner step, and the second control unit 2 provides for stopping the base for loading blanks through each angular step. Simultaneous independent operation of two control blocks lasts until the last billet from the batch laid with the CW step is left on the furnace unloading axis, i.e. while the billet has billets of two different angle races doc

- When the last batch of a batch stacked with the number accumulated in the second counter 12 of the first control unit 1 becomes equal to the number stored in the third counter 18 of the same block, the output of the comparison element 19 appears which turns off the input of the memory element 20 of the memory, prohibiting the passage of pulses from the sensor 4

and v pylc 6 through the fourth valve 15 to the input of the first counter 9. At this, the joint operation of the two control blocks 1 and 2 is stopped, only the second control block 2 continues, and each time the hearth stops, it can load and unload the blanks of only one new batch. In the first decoder 10 and the second decoder 13 of the first block

1 control you can add new numbers o (,, o (, + Aj, n, j for the subsequent batch of blanks.

When the last batch of the batch is loaded with the pickup angle 2, a job signal Input 1 is sent, which turns on memory input 20 of the first control unit 1, triggers trigger 3 on input Vi to the state. Further, the work cycle continues in a similar way.

,,

The proposed device for controlling the drive of the hearth of an annular furnace in comparison with the best samples of similar equipment ensures the operation

Serving simultaneously with two corners of the layout of blanks when changing these angles. This allows you to switch to loading billets from a furnace with a new pickup angle, do not expect full unloading.

blanks of the previous batch, laid with a different angle, increase the productivity of the furnace and more fully utilize, thereby, the capabilities of the tube-rolling unit, which includes a heating furnace.

Claims (2)

Invention Formula A device for controlling the drive of the hearth of an annular furnace, comprising amplifying switching unit, the output of which is connected to the drive motor of the furnace hearth, connected to the pulse sensor, and the first block 5 of the control consisting of sequentially connected first counter, decoder and valve, the output of which is connected to the first inputs of the OR and the second counter, 0 whose second input is connected to the second input of the OR element and the second output of the first decoder, and the output through the second decoder to the second input of the first valve, the output of the OR element is connected to the first input of the First counter and the first input of the amplifier-switching unit, characterized in that in order to expand the field of application of the device, it contains a trigger and a second control unit, and in each control unit, the second third and fourth valves, the third counter, and comparison and memory elements are inserted, with the pulse sensor with the single inputs of the fourth gates, the trigger outputs are connected to the first inputs of the second and third gates of the respective control units, the trigger inputs are connected to the first inputs of the corresponding memory elements, the output of the OR element of the second control unit is connected to the second input of the amplifying switching unit, the second inputs the second and third valves are connected by the Oootvitsa Yaysg with the outputs of the first. valves and the second outputs of the first decoders, and the outputs, respectively, with the first and second inputs of the third counters, in outputs that are connected to the first the inputs of the comparison elements, the second inputs of which are connected to the outputs of the second counters, and the outputs with the second inputs of the memory elements whose outputs are connected to the second inputs of the fourth gate, the outputs of which are connected to the second inputs of the first counters. Sources of information taken into account in the examination 1, USSR author's certificate 206623, cl. G 05 D 3/00, 1967, 2. USSR author's certificate No. 510690, cl. G 05 D 3/00, 1974 (prototype).