RU1775033C - Device for control of roller-hearth furnace bloom discharge - Google Patents

Abstract

SUMMARY OF THE INVENTION: a workpiece moving in a furnace along the roller conveyors crosses the front end of the photosensor DI, the discharge window opens, the open state of which is fixed by the limit switch. Then, the preform is discharged from the furnace and fixed by an Oz or DA photosensor, by means of which the corresponding line of the discharge discharge pickup roll is turned on. When the workpiece crosses the DS or About photosensor with its front end, the roller table stops, after which the discharge window closes. 2 silt

Description

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The invention relates to technical means of automated control systems and can be used, in particular, to detect the fact of loading and unloading billets, as well as controlling the loading and unloading of billets heated in tempering roller furnaces of rolling mills.

A device is known for controlling the delivery of billets from a furnace, comprising an inverter, an element I, triggers, a pulse shaper in a delay line implemented on a single vibrator and a shaper, two photosensors and a trigger setting button.

Closest to the proposed is a device for controlling the delivery of preforms, containing two sensors, the distance between the points of sight of which is greater than the width of one preform, but less than twice its width, the first sensor is connected to the first inputs of the first and second elements And through an inverter with the first inputs the third and fourth elements I. the output of the first element And is connected through the delay element to the second inputs of the second and fourth elements I. through the trigger to the second input of the third element And, and in the device A pulse shaper has been introduced, the input of which is connected to the second sensor and the second input of the first element And, and the output, to the third input of the third element I. The disadvantages of these devices are that they are designed to determine the fact of delivery from the heating furnace of one, two or more blanks of the same geometric dimensions, regardless of the presence of a gap between them; not suitable for controlling the unloading of billets from a roller furnace, in which the billets are unloaded in one line

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live rolls in the furnace, and along both lines of live rolls; they do not take into account the slippage of the blanks on the rollers of the roller tables in the furnace. All this reduces the accuracy of managing the unloading of workpieces.

The aim of the invention is to increase productivity by improving the accuracy of control of the unloading of workpieces.

This object is achieved in that a device for controlling the unloading of billets from a roller furnace, containing two photosensors, four AND elements, an HE element, further comprises four photosensors, six Memory elements, two limit switches, four drives, an HE element, four AND elements, a prohibition element and an OR element, wherein the output of the first photosensor is connected to the first input of the first memory element, which is connected by the output to the input of the first limit switch, the first output of which is connected to the first input of the first input and the first input of the second element And, and the second output - with the first input of the first element And, which is connected to the first inputs of the third and fourth elements by an output. In I, which outputs are connected respectively to the first inputs of the third and fourth drives, the output of the second photosensor connected to the first input of the second memory element, which is connected to the second input of the first element And the second input of the second element And, which is connected to the input of the second drive by the output, the outputs of the third and fourth photosensors are connected respectively with the inputs of the first and second elements NOT and the first inputs of the third and fourth memory elements, the outputs of the fifth and sixth photosensors are connected respectively to the second inputs of the third and fourth drives and second inputs of the third and fourth memory elements, the outputs of which are connected respectively to the second the inputs of the third and fourth elements And, the first and second input of the sixth element And and the first inputs of the fifth and seventh elements And, which are connected by the second inputs respectively to the outputs of the first o and the second element NOT, the outputs of the fifth and seventh AND elements are connected respectively to the first and second input of the OR element and to the first and second input of the eighth AND element, which is connected to the first input of the sixth memory element, the second input of which is connected to the first output the second limit switch, the output of the sixth memory element is connected to the first input of the fifth memory element and to the third input of the OR element,

which is connected by an output to the second inputs of the first and second memory element and with the first input of the prohibition element, the second input of which is connected to the output of the fifth

memory element, which is connected to the output of the sixth element And by the second input, the output of the inhibit element is connected to the input of the second limit switch, which is connected to the second input by the second output

first drive.

In FIG. 1 shows a block diagram of the proposed device; in FIG. 2 is a diagram explaining the operation of the device.

The device comprises a first photosensor 1, a first memory element 2, a first tip 3, which fixes the unloading window in the upper position, the first drive 4, the first element) And 5, the second photosensor 6, the second memory element 7, the second element And 8,

second drive 9, third 10 and fourth 14 AND elements, third photosensor 12, third memory element 13, first element HE 14, fifth 15 and sixth 16 AND elements, third drive 17, fourth photosensor 18, fourth memory element 19, a second element NOT 20, a seventh AND element 21, a fourth drive 22, a fifth memory element 23, a prohibition element 24, an eighth AND element 25, an OR element 26, a sixth memory element 27,

a second tip 28 securing the discharge window in the lower position, the fifth 29 and sixth 30 photo sensors.

In FIG. 2 is a diagram explaining the operation of the device in accordance with

a sequence of features of the claimed invention.

In the roller furnace there are two lines of roller conveyors No. 1 and No. 2 for moving the workpieces in the furnace. Movements and unloading of workpieces are possible both along one line and along both.

If the workpiece, moving along any line of the roller tables in the furnace, the DI photosensor (sensor

is located from the unloading window at a distance L necessary to fully open the unloading window), a command is issued to open the unloading window. The discharge window opens by an amount h which is larger than the maximum diameter (Dmax) of the workpiece. The opening of the window is fixed by the limit switch Kv. If the workpiece, moving in the direction of unloading from the furnace, crosses the photo sensor Dz with its front end

(located directly in front of the discharge window), and the end switch Kv, which fixes the opening of the discharge window, did not work, a command (emergency) is formed to stop the roller tables in the furnace. If

Kv window limit switch

worked before the photosensor D2 is triggered, a command is issued to stop the unloading window in the open state. Then, after the photosensor Da has been triggered, a circuit is prepared to turn on one of the lines of the unloading pick-up roll No. 1 or No. 2. When the front end being unloaded from the billet furnace crosses which - none of the Oz or DA photosensors installed at the furnace outlet, the drive of the corresponding receiving discharge roller N is turned on; 1 or No. 2.

If the blanks in the furnace are moved in two rows, then if they are dispensed, the Oz and D / i photosensors are triggered in some sequence, and when the given ends of both blanks de-energize the Oz and D4 photosensors, a command is issued to close the discharge window. Similarly, if a workpiece moves in a single row in the furnace, then when it is dispensed, the photosensor of the line from which the workpiece was delivered is triggered, and when the back end of this workpiece de-energizes the photosensor, a command is issued to close the discharge window. The discharge window closes. The closing of the discharge window is fixed by the limit switch Kn. When the workpiece is moving along the receiving roller of discharge roll No. 1 or N; 2, the photosensor DS or De crosses, a command is given to stop the unloading roller tables No. 1 or N ° 2.

The device operates as follows.

If the workpiece, moving along any line of the roller table in the furnace, crosses the front sensor 1, the photosensor will work and the signal from its output will go to the first input of the first memory element 2 and the signal from its output through the first limit switch 3 will go to the first the input of the first drive-4 (unloading window) and to the first input of the And 8. element. The unloading window opens by an amount h which is greater than Pmax - the maximum diameter of the workpiece. When the unloading window is opened by a certain amount, the first limit switch 3 is activated and its first output is de-energized, as well as the unloading window drive 4. The unloading window is stopped in an open state to further advance and unload blanks from the furnace. At the second output of the first end 3, a signal appears which is supplied to the first input of the first AND element 5.

A second photosensor 6 is located in front of the discharge window, which is designed to block the movement of the workpiece along the lines of the roller tables in the furnace if the discharge window does not open to the required size.

In the process of moving the workpiece in the furnace from the output of the second photosensor 6, the signal is fed to the first input of the second memory element 7, the output of which is fed to the second inputs of the first 5 and second 8 elements I. If the first limit switch 3 does not work, and the second the photosensor b is activated, then the second element And 8 is triggered, and an alarm is issued from its output

0 to the second drive 9 to stop the roller tables in the furnace (this situation is only possible in emergency mode).

In normal mode, when the first limit switch 3 trips, and then the second photosensor b is triggered, the first And 5 element will trip. The signal from the output of the first And 5 element goes to the first inputs of the third 10 and fourth 11 And elements.

Moving workpieces in the oven can

0 be both one-row and two-row. When the workpieces in the furnace move in two rows, then during the movement of the workpieces, the workpieces may slip and their front ends can be any amount

5 to be biased. Therefore, when unloading billets from the furnace, it is necessary to take into account the bias of the billets.

Consider the option where the workpiece is first unloaded onto the first line of the receiving unloading roller table, and then with some offset to the second.

If the workpiece is first unloaded on the first line, the third photosensor 12 is activated and the signal from its output

5 to the first input of the third memory element 13 and to the input of the first element NOT 14. From the output of the third memory element 13, the signal is supplied to the first inputs of the fifth 15 and sixth 16 elements And and the second input is third of its element And 10. The third element And 10 is triggered and the signal from its output goes to the third drive 17 of the receiving roller of discharge No. 1. The workpiece moves along the receiving roller of discharge No. 1. Then

5, the second workpiece is unloaded by some offset on the second line of the receiving roller of discharge No. 2. The fourth photosensor 18 is activated, and the signal from its output goes to the first input of the fourth element

0 memory 19 and the input of the second element NOT 20. From the output of the fourth memory element 19, the signal is supplied to the second inputs of the fourth 11 and sixth 16 elements And and to the first input of the seventh element And 21. Fourth

5, the And 11 element is triggered and the signal from its output goes to the fourth drive 22 of the discharge unloading roller No. 2. The workpiece moves along the discharge unloading roller No. 2. In the case of blanks arriving on both lines of the unloading discharge roller and the third 13 and fourth 19 memory elements are triggered , the sixth element And 16 is triggered, and from its output the signal goes to the first input of the fifth memory element 23, and from the output of the last to the ban input of the ban element 24. In the future, the workpiece is moved along the receiving roller tables of unloading No. 1 and No. 2 , the rear end de-energize the third 12 and fourth 18 photosensors. When the third photosensor 12 is de-energized, the input of the first element NOT 14 is de-energized and a signal is received at its output, which is fed to the second input of the fifth element And 15. From the output of the element And 15, the signal goes to the first inputs of the eighth element And 25 and the element OR 26. Similarly, when the fourth photosensor 18 is de-energized, the input of the second element HE 20 is de-energized and a signal appears at its output, which is fed to the second input of the seventh element And 21. From the output of the element And 21, the signal goes to the second inputs of the eighth element And 25 and OR element 26. Ex In this case, the eighth element And 25 is triggered and from its output the signal is fed to the first input (to trigger) of the sixth memory element 27. From the output of the sixth memory element 27, the signal goes to the third input of the OR element 26 and to the second input (reset) of the fifth element 23. The latter is de-energized and, in turn, de-energized, the inhibit input of the inhibit element 24. In the future, the signal through the OR element 26 and the inhibit element 24 is fed to the second limit switch 28 and from the first output of the last signal is fed to the second input of the first drive 4 of the loading window ki. The discharge window moves to the closing side.

In the interval, close the windows for unloading the workpiece, moving along the receiving roller tables of unloading No. 1 and No. 2, will cross the fifth 29 and sixth 30 photosensor with their front ends, respectively, the lines N T and No. 2 of the unloading table. The signals from the outputs of the fifth and sixth photosensors respectively arrive at the stop of the third 17 and fourth 22 drives of the receiving roller conveyor of unloading No. 1 and hi 2 and to the second inputs (dump) of the third 13 and fourth 19 memory elements.

The unloading window, moving, closes after a certain time and in this case the second tip 28 is triggered. The signal from its second output is fed to the second input (reset) of the sixth memory element 27, and the first output is de-energized and the unloading window stops in the closed state.

If the workpieces are moved in a single row in the furnace, i.e. along the line of the rolling table in the furnace No. 1 or ISfe 2, then in this case the operation of the photosensors 1 and 6 and

opening the unloading window is carried out similarly to the above. The first element And 5 is activated and the signal from its output goes to the first inputs of the third 10 and fourth 11 elements I.

0 When moving the blanks on the conveyor line in the furnace No. 1 or No. 2, the third 12 or fourth 18 photosensor is activated. The signal from the photosensors 12 or 18 is supplied respectively to the first input of the third 13

5 or fourth 19 memory elements and to the input of the first or second elements NOT 14 or NOT 20. From the output of the third or fourth memory elements 13 or 19, the signal is supplied respectively to the first input of the fifth 15

0 or the seventh 21 element AND and to the second input of the third 10 or fourth 11 element I. The third 10 or fourth 11 element AND is triggered and the signal from one of these elements goes respectively to the third

5 17 or fourth 22 drive of the receiving roller of discharge unloading No. 1 or No. 2. The workpiece moves along the receiving roller of discharge unloading No. 1 or No. 2.

Since the unloading of billets from the furnace is one day, in this case one of the elements (third or fourth) of the memory 13 or 19 is triggered and the signal is present at one of the input of the sixth element And 6. The sixth element And 6 is de-energized and de-energized

5 output of the fifth memory element 23.

Thus, at the ban output of element 24 there is no signal, and this element, when a signal appears at the input, will work. When the workpiece with the rear end de-energizes the third 12 or fourth 18 photosensor, the input of the first 14 or second 20 elements is NOT de-energized and the output of one of them receives a signal that goes to the second input of the fifth 15 or seventh 21 element I. From the output And element 15 or 21, the signal is supplied respectively to the first or second input of the OR element 26. The signal from the output of the OR element 26 through the inhibit element 24 is fed to the second final

0 switch 28 and from the first output of the limit switch, the signal enters the second input of the first drive 4 of the discharge window,

In the future, the device works similarly.

5 The use of the proposed device for controlling the unloading of billets from a roller furnace will allow, in comparison with known devices, to increase the accuracy of control, to exclude a control error in determining the issue

blanks, improve the technical and economic characteristics of roller furnaces.

The economic effect of using the invention is 70 thousand rubles.

Claims (1)

SUMMARY OF THE INVENTION A device for controlling the unloading of billets from a roller furnace containing two photosensors, four I elements. An element NOT, characterized in that, in order to increase productivity by increasing the accuracy of control, it additionally contains four photo sensors, six memory elements, two limit switches , four drives, an element NOT, four AND elements, a prohibition element and an OR element, wherein the output of the first photosensor is connected to the first input of the first memory element, which is connected by the output to the input of the first th final vyklyuchate- l. whose first output is connected to the first input of the first drive and the first input of the second And element, and the second output is to the first input of the first And element, which is connected by the output to the first inputs of the third and fourth And elements, which, in turn, are connected respectively to the first the inputs of the third and fourth drives, the output of the second photosensor is connected to the first input of the second memory element, which is connected by an output to the second input of the first element And and the second input of the second element And, which is connected to the input by the output the second drive, the outputs of the third and fourth photo-sensors sensors are connected respectively to the inputs of the first and second elements NOT and the first inputs of the third and fourth memory elements, the outputs of the fifth and sixth photosensors are connected respectively to the second inputs of the third and fourth drives and second inputs of the third and fourth memory elements, the outputs of which are connected respectively the second inputs of the third and fourth element And, the first and second input of the sixth element And and the first inputs of the fifth and seventh element And, which are connected by the second inputs respectively e output by the first and second element NOT, the outputs of the fifth and seventh AND elements are connected respectively to the first and second input of the OR element and to the first second input of the eighth AND element, which is connected to the first input of the sixth memory element, the second input of which is connected to the first the output of the second limit switch, the output of the sixth memory element is connected to the first input of the fifth memory element and to the third input of the OR element, which is connected by the output to the second inputs of the first and second memory element and to the first input of the element apreta, a second input coupled to an output of a fifth memory element, which, in turn, a second input connected to the output of the sixth AND gate, barring element output coupled to an input of the second limit switch, which second output is coupled to a second input of the first actuator. 0 & W / FIG. 2