SU1019201A1 - Apparatus for controlling charge of furnace for heating blanks - Google Patents

Abstract

CONTROL DEVICE OF LOADING FURNACE FOR HEATING BLANKS, containing actuators of the pusher and walking beams, control unit of the actuator of the pusher, the output of which is connected to the actuator of the pusher, setting devices of the width of the gauge and the interval between the workpieces connected to the first and second inputs of the control unit of the actuator of the pusher, respectively in the zone of unloading of the furnace, the pusher movement sensor connected to the third input of the control unit of the pusher drive, the sensor of the End full step beams and a comparator unit, the first input of which is connected to the sensor for the end of the full step of the beams, characterized in that, in order to increase the reliability of the device, the walking beams displacement sensor, the workpiece width information transfer unit, the block for determining the work out mechanism, the second sensor for the presence of workpieces, the sensor for moving the dispensing mechanism for cooking and the control unit for driving the walking beams, the first, second, third, fourth, fifth and sixth inputs of which are connected to the first and the second By sensors of the presence of blanks, by the output of the block for determining the coordinate of the mechanism for issuing blanks; by the output of the block for transmitting information about the width of the workpieces, by the sensor for moving the walking beams and by the sensor for terminating the full step of the beams, respectively, the first and second outputs are connected to the second input of the comparator and the first input of the block for determining the coordinates the mechanism for issuing blanks, the displacement sensor of which is connected to its second output, and the third input of which is connected to the sensor of displacement of walking beams, the third input How do you connect to the outlet

Description

The invention relates to the field of automation of technological processes in the ferrous metallurgy and can be used to control walking furnaces with one-sided heating of the metal in hot rolling mills.  A furnace control unit is known which includes drives of the pusher and walking beams, a control unit, a width adjuster, a slab spacing unit, a pusher displacement sensor, a pitch beams displacement sensor, a slave sensor installed at the front of the kiln discharge zone, a counter and full beam spacing sensor.  The furnace load includes, the supply by the pusher of the slab to the Specified position in the furnace loading zone (with a specified interval relative to the position of the previous slab) and transportation by the stepping beams (or the stepping furnace) of a series of slabs in the furnace to supply the slab, to be discharged from the furnace, to a predetermined position in the discharge zone of the furnace by a known device, a control signal fixing the position of the slab in the discharge zone of the furnace is obtained at the output of the slave sensor at the instant of intersection of the line of sight of the last front m end of the slab to be dispensed from the furnace.  At the same time, the horizontal signal is interrupted by the indicated signal before the beam beams are completely completed, and then, using the control unit, the drives of the beams and the pusher are blocked until the kiln is unloaded.  Consequently, the furnace loading cycle is completed by using an additional, incomplete beam step, which is a disadvantage of the known device, since the execution of the additional beam steps accordingly reduces the rate behind the furnace loads and increases the power consumption in each furnace loading cycle (the walking beams drive is incomparably more powerful consumer of electricity relative to all other drives of slab transport mechanisms).  In addition, the disadvantage of this device is also its low reliability, since the device becomes inoperable in case of failure of the sensor for the presence of blanks.  Closest to the invention in. A furnace charging control unit for heating billets containing a drive of a pusher and walking blocks, a control unit, the first and second outputs of which are connected to the drive of the pusher and the first input of the walking beams drive, respectively, setting devices Width of the workpiece and the interval between workpieces connected to the first and the second inputs of the control unit, respectively, the workpiece presence sensor installed in the discharge zone of the furnace, the pusher displacement sensor connected to the even-twisted input of the control unit, the number counter the steps of the beams, the output of which is connected to the fifth input of the control unit, the sensor of the end of the full step of the beams, the comparison unit, the first and second inputs of which are connected to the sensor for the presence of blanks and the end of the full step of the beams, respectively, and the output is connected to the third input of the control unit and the second input drive walking beams, and the sensor presence of workpieces is offset from the front of the discharge zone by the amount of full step beams towards the furnace. .  The furnace loading control by a known device is carried out as follows.  When the pusher travels in the direction away from the furnace, the Y coordinate is measured with its displacement sensor (Fig.  1) the position of the workpiece in the furnace loading zone, which is stored in the control unit: P | e produces a successive series of workpieces in the furnace before the first of them enters the issue area, the size of which is equal to the full step of the beams S, the cycle of the beams is terminated by coincidence of information presence sensor signals.  the workpieces and the full beam spacing sensor, the comparison unit generates a corresponding signal, the amount of movement B in a row is determined according to a counter recording the number N of the full beams t. e.  In S-N; the width of the workpiece WD and the interval between the workpieces are set manually using setters; calculating the required stroke of the pusher 5d and generating the corresponding control signals is performed by the control unit, and 5d "Y h-V-Od- after the operation of the furnace 31 is loaded from the output of the control unit, the control signal is fed to the drive input of the walking beams whose cycle is performed in the absence of blanks in the area of unloading (no signal at the output of the comparison block -3.  The disadvantage of the known device. This is its low reliability in the event of a failure of the sensor for the presence of workpieces, since it eliminates the possibility of determining the position of the rear end of the stopped workpiece to be taken out of the furnace (it can be stopped outside the unloading zone).  As a result, an emergency situation may occur, which leads to the destruction of the valve on the discharge side of the furnace or to the destruction of the order of the workpiece cage in the process of lifting the lag of the mechanism for discharging billets from the furnace.  The purpose of the invention is to increase the reliability of the device.  This goal is achieved by the fact that, in the furnace control unit for heating billets, comprising pusher drives and walking beams, a pusher drive control unit, the output of which is connected to the pusher drive, the widths of the workpiece and the gap between the workpieces are connected to the first and second inputs of the block controlling the drive of the pusher, respectively, the first sensor for the presence of workpieces installed in the discharge zone of the furnace, the sensor for moving the pusher connected to the third input of the control unit of the drive a body, a full step termination sensor for beams and a comparison unit, the first input of which is connected to the full step termination sensor; a moving beam movement sensor, a transmission unit, workpiece width information, a workpiece issuance mechanism coordinate determination unit, the sensor for moving the workpiece dispensing mechanism, the walking beam drive control unit, the first, second, third, fourth, fifth and sixth inputs of which are connected to the first and second sensors of the presence of the workpieces, output m blocks determining coordinates dispensing mechanism preforms output information transmission unit of the workpieces width transducer com movement of walking beams and completion dates Chick full step beams, respectively, and first and second passages, you are connected to a second. the input of the comparator unit and the first input of the block for determining the coordinate of the workpiece discharging mechanism, the displacement sensor of which is connected to its second input, and the third input of which is connected to the displacement sensor of the walking beams, the third input of the comparator unit is connected to the output of the control unit of the pusher drive, the fourth input connected to the movement sensor of the walking beams, with the sensors for the presence of blanks. shifted from the front of the discharge at a distance of no more than the total step of the beams away from the furnace.  The introduction of sensors for movement of beams and the mechanism for issuing blanks allows measuring the path of movement of the transport mechanism of the furnace charge and the mechanism of billets from the furnace. Introduction of a block for transferring information about the width of billets, a block for determining the coordinate of the mechanism for issuing blanks and new connections for the comparator allows you to determine the relative position sensors for the presence of blanks; the coordinate of the position of the front and rear ends of the blanks belonging to the furnace charge and to be discharged from the furnace; determine, relative to the starting point of the mechanism for issuing billets, the coordinates of the position of the trailing edge of the billet issued from the furnace, and also compare the measured widths of the billets moved in the Butt-joint furnace with the given block of transmission information and information about the width of the billets.  The introduction of the second presence sensor, blanks, and the walking beam drive control unit allows the first or second sensors to fail if there are blanks to eliminate the resulting uncertainty in the formation of reference signals in this cycle of beams by performing an additional block step, which, unlike the known device, reads the true position coordinates front and rear ends of the workpiece on the signal of the sensor that did not return in the additional and in all subsequent cycles of the beams.  The use of maneuvering with beams (additional step) is a rather rare phenomenon, since the need for it, on average, arises with a very low frequency f / T, where T is the average uptime of the workpiece sensor.  An approximate numerical value of T can be obtained if the failure rate of the backed-up sensor is known, which, for example, in the case of using a radioisotope indicator, is approximately D, ", from which time T" I | / D, is 1000 h.  At the rate of supplying the blanks to the heating furnace equal to F 10 pcs / h, we find that the need to use the additional step arises, on average, once every 10,000 (T-P blanks issued from this kiln.  FIG.  1 is a block diagram of a redundant Iechi load control device for heating. v wa blanks; in fig.  2 is a block diagram of a pusher drive control unit; in fig.  3 is a block diagram of a beam drive control unit; in FIG.  i - block diagram of the block for determining the coordinate of the mechanism for issuing blanks; in fig.  $ -.  block diagram of the comparison block.  The device (FIG.  1 contains priv. one pusher, drive 2 walking beams, pusher drive control unit 3, the output of which is connected to drive input 1, workpiece width setting device 4 and workpiece interval setting device 5, connected to the first and second inputs of the pusher drive control unit 3, respectively, two sensors 6 the presence of overheads, a pusher displacement sensor 7 connected to the third input of the pusher drive control unit 3, full beam end sensor 8, a comparison block 9 whose output is connected to the drive input of the 2 beams, and the third and first inputs - to the outputs of the pusher drive control unit 3 and the sensor 8, respectively, the walking beam movement sensor 10, connected to the fourth input of the pusher drive control unit 3, the walking beams drive control unit 11, the first output of which is connected to the second input of the comparison unit 9, and the first, second , the fifth and sixth inputs to two sensors 6, to sensors 10 and 8, respectively, block 12 transmitting information about the width of the workpiece, the output of which is connected to the fourth input of block 11 controlling the drive of beams, block 13 determining the coordinate of the mechanics The output code for cooking, the output of which is transferred to the third input of control unit 11 10 1.  6 by the drive of beams, and the first and third inputs are to the second output of the beam drive control unit J1 and the output of sensor 10, respectively, sensor 1 of moving the workpiece discharging mechanism, the output of which is connected to the second input of block 13.  Drive mechanized.  The workpiece delivery maker is kinematically connected with the sensor 1 for moving the workpiece delivery mechanism.  One of the possible versions of the pusher drive control unit 3 is shown in FIG.  2  It contains a bitch Mator 15, the first and second inputs of which (are the first and second inputs of the block 3 are connected to the outputs of setters 4 and 5, respectively, reversible counter 16, the installation inputs of which are connected to the outputs of the adder 15, elements 17 and 18, the first inputs which are connected to outputs one and two sensors 7, respectively (via the third input of block 37, RS Trigger 19, the direct output of which is connected to the second inputs of elements 17 and 18, respectively, and the two-input elements And at inputs 5 and R of the trigger 19, the first inputs are connected to output A and u th - to the outputs B and B of the sensor 7, respectively, element OR 20, the first and second inputs of which are connected to the output of element 18 and sensor 10 (through the fourth input of block 3, respectively, RS flip-flop 21 with two-input elements AND at the inputs S and I, the first inputs are interconnected and connected to the output of the counter 16, and the second to the output of the element 20, the counting input Subtracting the counter 16 and to the output of the element 17, the counting input Addition of the counter 16, respectively, R5 flip-flop 22 and one-shot 23, the input of which is connected to the direct output of the trigger 22, and the output - to the input of the permission to write the code in the counter 16, and the inputs S and R of the trigger 22 are connected to the outputs of the elements 18 and 17, respectively.  The direct output of trigger 21 (output of block 3) is connected to the input of the drive 1 of the pusher and the third input of block 9 of the comparison.  The beam drive control unit 11 (FIG.  3 contains one-shot 2C and 25, the inputs of which are connected to the outputs of sensors 6 (through the first and second inputs of block 11), RS-flip-flops 26 and 27, inputs S of which are connected to the inputs of single-phase 2 and 25, respectively, the element OR 28 and the element And 29, the first and second inputs of which are connected to the direct outputs of the flip-flops 26 and 27, respectively, the element OR 30, the first and second inputs of which are connected to the outputs of the single-oscillators 25 and respectively, the element. And 31 ,.  the first and second inputs of which are connected to the outputs of the element 28 and the sensor 10 (via the fifth input of the block 11), respectively, the counter 32 whose installation inputs are connected to the information transmission unit 12 (via the fourth input of the block 11), the counting input of the counter subtracting is connected to the output of the element 31.  aT) -the output of the counter is connected to the first input of the block 13-determining the coordinates of the extractor (. through the second output of the block 11) the one-shot 33 whose input is connected to the output O of the counter 32, the element OR 3 the first and second inputs of which are connected to the outputs of the one-shot 33 and the element 30, respectively, and the output connected to the permission input of writing the code to the counter 32, RS-flip-flop 35, the inputs S and R of which are connected to the outputs of the single vibrator 33 and element 30, respectively, element I Зb, the first input of which is connected to the inverse output of the trigger 35, and the output to the R inputs of the triggers 2b and 27, element I 37, etc. my input is connected to the output of sensor B (via w front input of block 11), 1-trigger 38, inputs D and C of which are connected to the inverse output of element 29 and direct output of element 37, respectively, 3)-trigger 39, inputs of T and C of which are connected to the direct output of trigger 38, the inverse output of the element 37, respectively, the OR element tO, the first and second inputs of which are connected to the direct outputs of the element 29 and the trigger 39, respectively, the elements AND H1 and fZ, the first inputs of the KOTOIHIX are connected to the direct outputs of the trigger 27 and 26, respectively, the second inputs are connected to the direct output of the trigger 38, the outputs of which are ir ts pulse signals of sensor failures 6, RS trigger k3 with two-input element TBm and at the input, the first and second inputs of which are connected to the direct output R of element 37 and the output of element O, respectively, input-S of the trigger is connected to the output of block 13 (third $ 63 third input unit 11), to the second input of element 36, to the inverse input of element 37 and the inverse trigger trigger (first output of lock 11) is connected to the first input of the 9c5 command unit 1 01 Vlok 13 determining the coordinate of the work out mechanism (FIG. ) contains RS flip-flop k with two-input elements I at inputs S and R, the first inputs of which are interconnected and connected to output E, and the second inputs to outputs F and 3 sensors 1k respectively (via the second input of block 13) I- element OR L5 with two-input and three-input elements And at the inputs, the first input of the two-input element is connected to the output of sensor 10 (via the third input of block 13), and the first and third inputs of the three-input element are connected to the forward output of the trigger and the first output of sensor 1 (through the second input block 13), respectively, The sensor tS, the setup inputs of which are connected to the second output of block 11 (through the first input of block 13), the counting input of the Subtraction counter is connected to the output of element 5, the element NOT whose input is connected to the output O of the counter and to the third input of block 11 through the output of block 13 ), and exit Linked to the second inputs of the input elements AND element 5.  Comparison unit 9 (FIG.  5) contains the element OR NOT 48, the inputs of which are connected to the outputs of blocks 11 and 3 f the second and third inputs of block 9) the element OR, the first and second inputs of which are connected to the output of sensor 8 (first input of block 9) and to the output of the element respectively and the output is the output of block 9 and is connected to the drive input of the 2 beams.  The device works as follows.  The pusher drive control unit 3 begins to function when the pusher enters the furnace with blanks.  Sensor 7 (outputs A, B) triggers trigger 19 (FIG.  2).  After shutdown, drive 1 is reversed.  At the time of the reverse, trigger 22 turns on trigger 22, since trigger 19 is on and the first pulse at output B of sensor 7 is turned on.  When this one-shot 23 generates a pulse, allowing the recording of the sum of the width of the next workpiece WA and the required interval Wc outputs of the setters k S through the adder 15 in the counter 16.  Its code thus corresponds to the value of "/ A- iiW910. With further pusher travel from the furnace, the code decreases by an amount from the starting point to the rear edge of the workpiece loaded into the furnace}, since the sensor 7 pulses arrive at the subtracting input of the counter (two output , elements 18 and 20 At the moment when the pusher passes the starting point, trigger 19 is turned off by signals from outputs three and two sensors 7 (the duration of the signal at output 3 is longer than the pulse period at outputs one and two prohibiting the passage of pulses ithout element 18 "code counter 16 at this time corresponds to the value S. + + A. W- W.  The stroke of the pusher in the loading zone and, consequently, the value of Y does not usually exceed the total step size of the beams 5, which makes it possible to arrange the workpieces in the furnace at any desired UW intervals, and loading of the workpieces can be performed after one or several full cycles of movement of the beams.  The S value for the furnaces of the most widespread wide-strip hot rolling mills is chosen 2 times smaller than the minimum width of the billets.  Accordingly, the obtained value VA & W-V D), which means that it is impossible to load the next billet without performing one or several steps of the beams.  During the step, the impulses of the sensor 10 flow through element 2 to the subtracting input of the counter 16, After performing the S steps of the beams, the stroke of the counter 16 is cooTBeTCTByeTW jH LO U Y, When at. at the next step of the beams, the counter goes through zero, trigger 21 is turned on, the signal from the direct output of which allows the next kiln load cycle and simultaneously enters block 9. After receiving the enable signal, the push wheel drive 1 performs the next load cycle.  When moving to the furnace and pusher the point of reference, trigger 19 is turned on (signals from output one and three sensors 7) t allowing the passage of pulses from output one through element 17 to input Addition of counter 16.  The first of these implications is open / precision trigger 21.  Counter code 16 at the time of the beginning of the counting corresponds to C, $ d, where C is the capacity of the counter, a5d is the calculated load coordinate of the workpiece 1 Thus, after counting the number of pulses corresponding to 5d, counter 16 again passes through zero, while the trigger 21 at the input R is turned off and stops the drive of the pusher.  Further, the order of operation of the drive control unit 3 is repeated.  The block 12 for transmitting information about the width of the blanks is intended for informational support of products moving along a conveyor.  The parameter of the informational accompaniment is the width of the blanks loaded into the furnace, the sensor of which is setpoint k.  When the furnace is loaded, the width in block 12 is memorized by the falling edge of a single signal from the push-drive control unit 3.  The issue of the width code of the workpiece supplied to the unloading position is made to the beam drive control unit 11 when the rear edge of the unloaded workpiece of the line of sight of the datumics 6 passes (output signals of the element 33 (FIG. 3) or the Abfig counter.  V.  At the time of intersection of the front hromka billet line vizioova-.  In one of the two sensors 6, unit 11 begins to function (FIG.  U, If the sensors are installed at a distance D from the front border of the issue area, then to get the trailing edge of the workpiece into the unloading area, the condition must be met, where X is the distance covered by the workpiece from the moment the sensors were installed across the installation plane 6.  The installation of two sensors 6 made it possible to perform hot duplication with monitoring the failed sensor, automatically disconnecting it from the block circuit and turning it on after restoration.  At the moment when the blank crosses the line of sight one of the sensors 6 (Fig.  3) its output signal is fed to the input of one of the 2A or 25 single-shotrs, the output pulse of which (via elements 30, 3) is fed to the input of information recording resolution of the counter 32. The workpiece width code simultaneously records the output width code from the output of the unit 12. flip-flops 2b or 27 and through the elements 28 and 31 permits the passage of pulses from the sensor 10 to the input. Subtracting the counter 32.  If the output of the second sensor 6 appears with a delay, the preset width code is repeated in counter 3 similarly to the one described above.  The walking beams are alternated with the workpieces placed on them before the rear edge of the next workpiece enters the unloading zone, the size of which is equal to the full step of the beams 5. At this moment, the counter code 32 is equal to S + D. FIG.  1) and at its output) a signal appears that enters block 13, which determines the coordinates of the work out mechanism.  In the presence of output signals from, two sensors 6 and the output signal of sensor 8, the end of the full step of the beams, the trigger is turned off through elements 29, tO and 37, prohibiting the beams from moving before unloading this workpiece.  Trigger 43 is turned on and a new cycle of beam movement begins at the input to element 37 and trigger A3 from block 13 of a signal that the workpiece has been unloaded. . At the same time through the elements 35, 37 and 36 descended. Dit turns on the trigger 26 and 27, fixing the output signals of the sensors 6.  The circuit of block 11 is prepared for receiving signals from sensors 6 at the intersection of their sighting with the next blank.  In case of failure of the Shading of one of the sensors type 6 unit 11, work as follows.  At the time of the output signal from the sensor 8, the end of the full step of the beams (through elements 29 and 37 the trigger 38 is turned on. The trigger k3 in this case is not disconnected from, giving permission for one more full step.  At the same time, an output signal appears on one of the elements A-1 or 2, indicating the number of the failed sensor 6.  At the end of the next full step of the beams and the output signal from the Sensor 8 (through element 37), the trigger 39 is activated.  Then t, through the kO element, the trigger is turned off, prohibiting the next uJar of the beams before unloading this workpiece.  In this case, if the rear edge of the workpiece does not intersect the line of sight of sensors 6 (t. e.  At the output O of the counter 32, the signal does not appear and the trigger 35 remains off, switching off of the triggers 26 and 27 occurs 10 t by the signal of the end of the unloading of the workpiece received from the block 13.  If the rear edge of the workpiece intersects the line of sight of the sensors 6, the output O of the counter 32 is the signal that arrives at the input of the one-shot 33.  The output pulse of the one-shot, first, through element 3 enters the write resolution input to counter 32 and the width code of the next workpiece is written to the counter and, second, turns on trigger 35, the signal from the inverse output of which blocks resetting trigger 2b m 27 when finished unloading this blank.  Thus, in the flow of workpieces moving end-to-end, the loss of information on the next workpiece in the case of permanently watered sensors 6 is excluded.  The block 13 for determining the coordinate of the workpiece dispensing mechanism is designed to determine the coordinate of the trailing edge of the workpiece relative to the initial reference point.  The block starts functioning at the moment a signal arrives from block 11, which permits writing the code to the subtracting counter k6.  By this signal from the counter, a code is recorded corresponding to the distance L from the point of origin of the movement to the front border of the zone of issue.  At the same time, at the output of element 7 and the inputs of elements And element 5, there is a signal permitting the passage through the element kS of displacement pulses from / gltchik 10 walking beams or from sensor 1.  When the beams are moved, the counter code k6 is reduced until the beams stop to unload the workpiece.  Then, during the mechanism for issuing blanks to the furnace and crossing the point of origin, trigger kk is turned on and pulses from sensor 1 are subtracted from counter code 6.  At the time of arrival of the mechanism for issuing blanks, a signal appears at the output O of the counter. Cash on the unloading of the workpiece, which enters the block 11, and also through the element C7 closes the inputs of the element 5 prohibiting the passage of pulses to the input of the counter 6.  Trigger C deactivation occurs when the mechanism for issuing blanks from the furnace and crossing the point of origin.  Comparison unit 9 (FIG.  5) generates an output control signal for the drive of 2 beams according to the ratio P b where in the signal for the resolution of the cycle of the beams; the beam cycle prohibit signal according to loading conditions, generated by block 31; the same, according to the terms of issue, formed by block 11; the full beam pitch signal (logical 1 — the step is executed, the logical step is turned off), formed by the sensor 8.  1 01 The indicated relationship is implemented by elements 48 and 49 of block 9.    The main technical and economic advantage in implementing the furnace loading control device for heating billets as compared to the known one is the elimination of equipment downtime due to automation due to increased reliability of the device. .

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Claims (1)

DEVICE FOR LOADING THE FURNACE OF THE FURNACE FOR HEATING PREPARATIONS, comprising pusher and walking beam drives, a pusher drive control unit, the output of which is connected to the pusher drive, workpiece width and workpiece spacing adjusters connected to the first and second inputs of the pusher drive control unit, respectively, the first presence sensor workpieces installed in the unloading zone of the furnace, a pusher displacement sensor, connected to the third input of the pusher drive control unit, a full-beam end sensor and a comparison unit, the first input of which is connected to the sensor of the end of the full step of the beams, characterized in that, in order to increase the reliability of the device, it additionally includes a sensor for moving the walking beams, a unit for transmitting information about the width of the blanks, a block for determining the coordinates of the mechanism for issuing blanks , a second sensor for the availability of blanks, a sensor for displacing the mechanism for issuing blanks and a control unit for the drive of walking beams, the first, second, third, fourth fifth and sixth inputs of which are connected to the first and second sensors the presence of blanks, the output of the block for determining the coordinates of the mechanism for issuing blanks, the output of the block for transmitting information about the width of the blanks, the sensor for moving walking beams and the sensor for ending the full step of the beams, respectively, and the first and second outputs are connected to the second input of the comparison block and to the first input of the coordinate determining block a workpiece dispensing mechanism, the displacement sensor of which is connected to its second output, and the third input of which is connected to the displacement sensor of walking beams, the third input of the comparison unit is connected nen yield · control unit. driven pusher, fourth entrance. which is connected to a sensor for moving walking beams, and the sensors for the presence of workpieces are offset from the front border of the discharge zone by a distance of not more than the full step of the beams away from the furnace.