KR20020051637A - Apparatus and method of controlling coke of vibro feeder automatically - Google Patents

Abstract

PURPOSE: An apparatus and a method for automatically controlling coke discharging amount of a vibro feeder are provided to crush coke to uniformed grain sizes in a rod mill by measuring weight of coke having defective grain sizes and applying the crushing defect ratio to controlling of coke discharging amount of the vibro feeder. CONSTITUTION: The apparatus and a method for automatically controlling coke discharging amount of a vibro feeder comprises the steps of presetting a plurality of standard values for crushing defect ratio(710); setting an initial coke discharging amount(720); measuring weight of crushed coke having defective grain sizes, and comparing the calculated ratio with the plurality of standard values for crushing defect ratio by calculating the measured weight into a ratio for weight of crushed coke corresponding to volume of a bucket(730,740,750); and increasing or decreasing the already set control value for coke discharging amount when the calculated ratio for weight of crushed coke is deviated from any one of the plurality of standard values for crushing defect ratio in the comparison step, and maintaining the already set control value for coke discharging amount when the calculated ratio for weight of crushed coke is not deviated from any of the plurality of standard values for crushing defect ratio(760).

Description

Coke discharge automatic control device of cutting feeder and its method {APPARATUS AND METHOD OF CONTROLLING COKE OF VIBRO FEEDER AUTOMATICALLY}

The present invention relates to a coke discharge amount automatic control device and method for cutting feeder, more specifically, coke discharge control device of the feeder is installed in the bottom of the hopper of the coke crushing process in the steel mill to supply the coke stored in the hopper to the rod mill side In the coke discharge rate automatic control device for measuring the weight of coke having a poor particle size and applying the rate of failure of the crushing to the coke discharge control of the cutting feeder, so that the coke can be crushed to a uniform particle size in the rod mill and It's about how.

In general, coke is indispensable as a heat source for dissolving iron ore in a blast furnace of an ironworks and as a reducing agent of iron ore, and plays an important role in improving gas ventilation in the blast furnace. The reason for crushing the coke to the particle size of the small particles is to improve the mixing distribution of the coke and to stabilize the sintering work when the coke, which is a raw material, is mixed with various raw ores including the main raw material ore in the sintering plant.

1 is a schematic view showing a coke crushing process in a sintering plant according to the prior art, referring to FIG. 1, the conventional coke crushing process is a coke (coke) of various types of particle size from 0.25mm to 50mm ), A hopper (1) for controlling the discharge of the coke of multi-type particle size stored in the hopper (1) for the strength of vibration, and a reference particle size (3mm) among the coke of the multi-type particle size transferred A screw feeder for feeding the coke corresponding to the screen 4 and the reference value exceeding (3 mm to 50 mm) to the coke corresponding to the lower side of the conveyor belt 8 installed in the lower portion of the rod mill 6. 5), a rod mill 6 for crushing coke corresponding to the oversize (3 mm to 50 mm) into coke of 3 mm or less, and a conveyor belt (3, 7, 8, 9) for conveying the coke. .

The cutting feeder 2 at the bottom of the hopper 1 receives the AC power single-phase 440V and adjusts the strength of the vibration of the cutting feeder 2 by the value set by the operator in charge of the cutting feeder 2. The discharge of coke of various kinds of particle size stored in the hopper 1 is controlled, and the discharged coke is conveyed to the screen 4 by the conveyor belt 3. Coke corresponding to the reference particle size (3 mm or less) of the coke of the various types of particle size transferred to the screen (4) is dropped and conveyed to the conveyor belt (8) installed in the lower portion and coke corresponding to the reference value exceeding (3mm ~ 50mm) It is dropped into the screw feeder 5 and charged into the rod mill 6. The rod mill 6 consists of a rod of several hundred rods and the rod has a weight of several tens of kilograms per piece. The specific rod specification is 80φ × 3.5m, 120kg per piece, and the number of loaded rods is 150. When coke corresponding to the oversize (3mm ~ 50mm) is loaded into the rod mill 6, the rod mill 6 rotates and the rotating rod and coke collide with each other and the coke is crushed to 3 mm or less. The crushed coke is conveyed by the conveyor belts 7 and 9 and stored in the raw material bin 11 by the damper 10.

By the way, the coke supplied to the hopper (1) is a coke of the coke plant, the return coke of the first blast furnace plant, the return coke of the second blast furnace plant, the coke loaded on the yard, anthracite coal, etc. , The distribution distribution of coke supplied to the hopper 1 is not good. The rod inside the rod mill 6 performs the crushing operation of the coke while rotating collision with the coke having poor mixing distribution. At this time, the crushing of the rod occurs due to mutual friction, so that the original crushing ability gradually decreases. Therefore, due to the particle size deviation of the coke stored in the hopper 1 and the wear of the rod installed inside the rod mill 6, the crushed coke having an uneven particle size is discharged, so that the operator in charge of the cutting feeder 2 discharges from the rod mill. In order to check the crushed coke conveyed by the conveyor at any time, there was a problem that the set value of the cutting feeder (2) should be changed according to the operation situation. In addition, even if the operator in charge of the cutting feeder 2 changes the setting value of the cutting feeder 2 according to the operation situation as described above, to obtain the crushed coke having the optimum particle size (0.25mm ~ 3mm) required in the sintering process Was difficult.

The present invention has been made to solve the above problems, an object of the present invention is to screen the crushed coke in the rod mill of the coke crushing process in the steel mill, and then measure the weight of the crushed coke with poor particle size at regular intervals, SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for automatically controlling coke discharge amount of a cutting feeder so that the particle size of the crushing coke is made more uniform by applying the incidence of crushing failure to the coke discharge amount control of the cutting feeder.

Another object of the present invention is to provide an apparatus and method for automatically controlling coke discharge amount of a cutting feeder which enables a stable sintering operation by making a good mixing distribution during raw material mixing in a sintering process.

1 schematically illustrates a coke crushing process in a sintering plant according to the prior art.

The configuration diagram shown.

Figure 2 is a perspective view of the crushed coke collection analysis apparatus for implementing the present invention.

3 is a time chart diagram of a crushed coke collection analysis device for implementing the present invention

All.

Figure 4 is a block diagram of the automatic cutting feeder automatic control apparatus according to the present invention.

5 is a detailed circuit diagram of the automatic cutting feeder automatic control apparatus according to the present invention.

6 is a time chart diagram of the automatic cutting feeder automatic control apparatus according to the present invention.

7 is a flowchart of a method for automatically controlling coke discharge amount of a cutting feeder according to the present invention.

Open.

※ Explanation of code for main part of drawing

1: Hopper 2: Feeding feeder 3, 7, 8, 9: Conveyor belt

4: screen 5: screw feeder 6: rod mill

7-1, 7-2, 9-1: Conveyor belt 10: Damper 11: Raw material bin

20: cylinder 1 21: bucket 22: bucket cover

25: Touch Bar 27: Suit 1 28: Screen

29: vibration motor 30: chute 2 31: cylinder 2

32: container 37: load cell

R1 ~ R79: Resistor VR1 ~ VR11: Variable Resistor

D1 ~ D18: Diode ZD1 ~ ZD 4: Zener Diode

C1 to C20: Condenser OP1 to OP20: Op amp

L1 to L9: Light emitting diode ISO1 to ISO3: Photocoupler

AN1 ~ AN5: Endgate U1: Buffer IC

U11 to U13: Invert TM1: Timer IC

F1 ~ F3: FET TR1 ~ TR7: Transistor

LU1 to LU3: Constant voltage IC MEM1, MEM2: Memory circuit

RY1: Relay T1 to T2: Trans

TH1: Thyristor

In order to achieve the above object of the present invention, the automatic coke discharge amount control apparatus and method of the cutting feeder according to the present invention is installed in the bottom of the hopper of the coke crushing process in a steel mill, cutting the coke stored in the hopper to the rod mill side An apparatus for controlling coke discharge amount of a feeder, comprising: a setting unit for setting an initial control value of a cutting feeder; A reference controller configured to output a control value by adding or subtracting a correction value to the set initial control value; A first storage unit for storing the set initial control value or the corrected control value; An operation unit which receives a weight measurement value of crushed coke having a poor particle size from the load cell, and calculates the measured value as a crushing failure occurrence rate with respect to the weight of the crushed coke corresponding to the volume of the bucket; A comparison unit for comparing the calculated failure rate generation rate with a plurality of reference values of a preset failure rate rate and outputting an addition or subtraction signal to the reference control unit; A DI input unit which receives an operation signal of a rod mill and a cutting feeder and outputs the signal to the delay operation unit, and receives an operation signal of a load cell and outputs the signal to the first storage unit and the comparison unit; A delay operation unit configured to configure a feedback circuit of a control value from the reference control unit to the first storage unit when a predetermined time elapses from receiving the signal of the DI input unit; And a cut-off feeder driver for driving the cut-off feeder by receiving the set initial control value or the corrected control value.

In addition, the method for controlling the coke discharge amount of the cutting feeder, the method comprising the steps of: setting a predetermined number of failure failure rate reference value in advance; Setting an initial coke discharge amount; Measuring the weight of the crushed coke having a poor particle size, calculating the measured weight as a ratio of the weight of the crushed coke corresponding to the volume of the bucket, and comparing the crushing failure incidence reference value with the several thresholds; In the comparing step, when the deviation from any one of the several crushing failure occurrence rate reference value is increased or decreased the control value of the preset coke discharge amount, if it does not correspond to any one, maintaining the control value of the preset coke discharge amount Characterized in that, in the above, the several failure rate of the threshold value is set in advance of three or more, 10% or more, 5% or more, less than 1%, the failure rate of the fracture is 10% or more or 5% or more In this case, the correction value is subtracted from the control value of the preset coke discharge amount, and if it is less than 1%, the correction value is added to the control value of the preset coke discharge amount.

Hereinafter, with reference to the accompanying drawings, the automatic coke discharge amount control apparatus and method of the cutting feeder according to the present invention will be described in detail.

Figure 2 is a perspective view of a coke discharge amount automatic control apparatus of the cutting feeder according to the present invention and a crushed coke collection analysis apparatus for implementing the method, Figure 3 is a time chart of the crushed coke collection analysis apparatus for implementing the present invention , Referring to this, the coke corresponding to the particle size of 3mm ~ 50mm is crushed into coke of 3mm or less in the rod mill (6) and then conveyed by the conveyor belt (7-1), the conveyed crushed coke to the bucket (21) Are dropped and stored. At this time, the cylinder 1 (20) is retracted toward the chute 1 (27) side, the bucket cover that was blocking the lower part of the bucket while the touch bar 25 of the bucket 21 is in contact with the buckle (26) on the chute 1 (27). 22 starts to open and when the cylinder 1 (20) is fully retracted, the bucket cover (22) is also fully opened so that the crushed coke stored in the bucket (21) falls to the screen (28) through the chute 1 (27). do. For reference, when the crushed coke is completed dropping to the screen 28, the cylinder 1 (20) is advanced to the conveyor belt (7-1) side, at this time, the bucket cover 22 that was opened in the lower portion of the bucket 21 Is closed by the center of the bucket cover 22 while moving forward toward the conveyor belt (7-1).

When the falling of the coke crushed to the screen 28 is completed, the vibration motor 29 is operated to screen the dropped coke (coke) of less than 3mm coke through the chute 2 (30) of the lower portion of the screen 28 The coke dropped to the belt 9-1 and having a particle size of more than 3 mm is dropped into the container 32 and stored. When the crushed coke of 3mm or more completes storage in the container 32, the load cell 37 measures the weight, and when the weighing of the crushed coke stored in the load cell 37 is completed, the cylinder 2 (31) is a conveyor belt ( 9-1), the container 32 is overturned on the conveyor belt (9-1) to discharge the crushed coke stored in the container (32). The process of collecting and weighing the crushed coke as described above is repeated periodically while the cutting feeder 2 and the rod mill 6 are operated as shown in the time chart diagram of FIG. 3.

Figure 4 is a block diagram of the automatic cutting feeder automatic control device according to the invention, Figure 5 is a detailed circuit diagram of the automatic cutting feeder control apparatus according to the present invention, Figure 6 is a time chart diagram of the automatic cutting feeder automatic control apparatus according to the present invention As a reference to this, the automatic control device of the cutting feeder is the setting unit A1 for inputting the initial control value of the coke discharge amount, which is the basic control value of the cutting feeder, the initial control value or the corrected control fed back from the reference control unit A3. In the first storage unit A2 for storing the value, the reference control unit A3 and the reference control unit A3 for receiving the HIGH signal from the comparison unit A10 and adding or subtracting the correction value to the set value. Control value from the second memory unit A4 for receiving and holding the control value of the control unit, the power supply unit A5 for supplying AC power so as to generate a synchronization signal from the extraction feeder driving unit A6, and the second storage unit A4. Receives the voltage corresponding to the control value The operation signal of the cutting feeder driver A6, which outputs the gate pulse to the thyristor side, and the cutting feeder 2 and the rod mill 6 is input to the cutting feeder 2 and is outputted to the delay operation part A9. The DI input unit A7 for receiving the operation signal of the load cell 37 and outputting the signal to the first storage unit A2, and the cutting feeder 2 and the rod mill 6 of the DI input unit A7. Delay operation unit A9 for operating the relay to configure the feedback circuit from the reference control unit A3 to the first storage unit A2 when the set time has elapsed after receiving the operation signal, and the weight of the crushed coke having a poor granularity from the load cell. An arithmetic unit A8 which receives the measured value and calculates the measured value as a failure rate of crushing with respect to the weight of the crushed coke corresponding to the volume of the bucket; Comparator for comparing the reference value of the failure rate generation failure and the predetermined reference value of the failure rate generation failure corresponding to the weight measurement value of the load cell calculated in the calculation unit (A8) and outputs an addition or subtraction signal to the reference control unit (A3) ( A10), characterized by.

Hereinafter, an embodiment of the automatic cutting feeder automatic control device according to the present invention will be described in detail. When the initial control value of the coke discharge amount is input from the setting unit A1, a voltage corresponding to the control value is applied to the cutting feeder 2. When the operation signals of the cutting feeder 2 and the rod mill 6 are input to the DI input unit A7, after a predetermined time has passed by the time circuit of the delay operation unit A9, the relay of the first storage unit A2 ( When the RY1 is operated and the inverted output signal of the initial control value is fed back to the first storage unit A2, and the operation signal of the load cell 37 is input to the DI input unit A7, the relays RY1-a operate. The storage state of the initial control value input to the first storage unit A2 is maintained. On the other hand, a voltage corresponding to the initial control value is applied to the cutting feeder 2 until the load cell 37 collects the crushed coke and completes the weighing.

When the load cell 37 collects the crushed coke and completes the weighing, and the measured value is input to the calculating unit A8, the measured value is calculated by comparing the calculated failure rate with respect to the weight of the crushed coke corresponding to the volume of the bucket. It is input to the part A10. The comparison unit A10 compares several reference values of a preset failure rate of crushing with the failure rate of crushing calculated by the operation unit A8, and outputs the result to the reference control unit A3 to correct the initial control value. The cutting feeder 2 is controlled by adding or subtracting the value, storing the value in the first storage unit A2 and the second storage unit A4, and outputting it to the cutting feeder driving unit A6.

As described above, the load cell 37 collects the crushed coke, measures the weight, and adds a correction value to the initial control value in the reference control unit A3 by the HIGH signal output from the comparison unit A10. Alternatively, if the value is subtracted and outputted, the value is stored in the first storage unit A2 and the second storage unit A4 until the crushed coke is collected and weighed in the next step. It outputs to A6) and controls the vibration state of the cutting feeder 2, ie, the intensity of vibration.

The several reference values of the pre-crushing failure rate set in the comparison unit A10 is a quantity that does not pass through the screen for the dropped bucket amount when the coke crushed in the rod mill is transported by the bucket and falls on the screen. The target ratio, that is, the reference value of the incidence of crushing failure is set in advance, and the setting criterion is {(measured value / bucket amount) × 100 [%]}, where the bucket amount is the weight of crushed coke corresponding to the volume of the bucket. Means. As shown in the time chart of the cut-out feeder control unit according to the present invention shown in FIG. 8, the allowable range of the crush failure rate is 1% or more and less than 5% and when the weight measurement value in the load cell falls within this range, the reference control unit ( A3) outputs a low signal to maintain the initial set value, and if the reference value of the failure rate of fracture is 10% or more, a high signal is output to the reference control unit A3 to compensate from the initial control value. Subtract the value. In addition, when the reference value of the failure rate of fracture is 5% or more, it is subtracted. When the reference value of the failure rate of fracture is less than 1%, the correction value is added and the value is added to the first storage unit A2 and the second storage unit ( It stores in A4) and outputs it to the cutout feeder drive part A6 to control the vibration state of the cutout feeder 2.

FIG. 7 is a flowchart of a method for automatically controlling coke discharge amount of a cutting feeder according to the present invention. Referring to FIG. 7, the crushed coke corresponding to the volume of the bucket in the calculating part A8 of the control device according to the present invention. Three reference values of the incidence of crushing failure, which are percentage values corresponding to the weight, are set in advance to 10% or more (S1), 5% or more (S2), or less than 1% (S3) (step 710), and the rod mill (6). In order to supply coke to the side, the control value of the initial coke discharge amount of the cutting feeder 2 located under the hopper 1 is set by the setting part A1 of a control apparatus (step 720).

The coke supplied from the rod mill 6 is crushed, the crushed coke is put in the bucket 21 and transferred to the chute 1 (27) side, and dropped to the screen 28 through the chute 1 (27), and Screening the dropped crushed coke, coke having a particle size of 3 mm or less falls through the chute 2 (30) below the screen 28 to the conveyor belt 9-1, and coke having a particle size exceeding 3 mm falls into the container 32. And stored. When the crushed coke exceeding the particle size of 3mm is completed storage in the container 32, the load cell 37 measures the weight and outputs the measured weight value to the calculating unit (A8) side of the control device (step 730).

The calculation unit A8 of the control device that receives the weight of the crushed coke having a poor particle size from the load cell 37 calculates the weight measurement value as the crushing failure occurrence rate M with respect to the weight of the crushed coke corresponding to the volume of the bucket. (Step 740), the comparison unit A10 of the control device that receives the failure rate generation failure M calculated by the calculating unit (A8) is three reference values of the predetermined failure rate generation rate (S) and the calculated failure rate By comparing the occurrence rate (M), if the calculated failure rate (M) is 10% or more and 5% or more, the control value of the preset coke discharge amount is decreased, and when it is less than 1%, the control value of the preset coke discharge amount is reduced. The addition or subtraction signal is output to the reference control unit A3 so as to increase (step 750).

In the reference control unit A3 receiving the addition or subtraction signal output from the comparison unit A10, the correction value is added or subtracted from the initial control value set in step 720 or the correction value is added to or added to the control value set in the previous step. Subtracted to output the corrected coke discharge amount control value to the cutting feeder side (step 760). The control value output from the reference control unit A3 is input to the first storage unit A2 and the second storage unit A4 to hold the control value until the next control value is corrected, and also the feed-out feeder. The driving unit A6 receives the control value from the second storage unit A4 and outputs a gate pulse to the thyristor so as to apply a voltage corresponding to the control value to the cutting feeder 2 (step 770). ). The coke discharge control of the cutting feeder by collecting and weighing the crushed coke is repeated periodically while the cutting feeder 2 and the rod mill 6 are in operation (step 780), and the operation is continued. If not, the coke discharge amount control of the cutting feeder is also terminated (step 790).

As described above, the apparatus for automatically controlling coke discharge amount of the cutting feeder according to the present invention and the method of the present invention provide the weight of the crushed coke having a poor particle size when the coke crushed in the rod mill of the coke crushing process exhibits an incidence of crushing defects out of a reference value. By measuring and applying the generation rate of crushing failure to the coke discharge amount control of the cutting feeder, there is an effect that crushed coke of uniform particle size can be obtained.

In addition, another effect of the present invention is to improve the quality and productivity of the sintered ore by improving the mixing distribution during the mixing of raw materials in the sintering process.

What has been described above is just one embodiment for implementing the coke discharge amount automatic control apparatus and method of the cutting feeder according to the present invention, the present invention is not limited to the above-described embodiment, it is claimed in the claims As will be apparent to those skilled in the art to which the present invention pertains without departing from the gist of the present invention, the technical spirit of the present invention will be described to the extent that various modifications can be made.

Claims (3)

In the coke discharge control device of the cutting feeder is installed in the bottom of the hopper of the coke crushing process in the steel mill to supply the coke stored in the hopper to the rod mill side, A setting unit for setting an initial control value of the cutting feeder; A reference controller configured to output a control value by adding or subtracting a correction value to the set initial control value; A first storage unit for storing the set initial control value or the corrected control value; An operation unit which receives a weight measurement value of crushed coke having a poor particle size from the load cell, and calculates the measured value as a crushing failure occurrence rate with respect to the weight of the crushed coke corresponding to the volume of the bucket; A comparison unit for comparing the calculated failure rate generation rate with a plurality of reference values of a preset failure rate rate and outputting an addition or subtraction signal to the reference control unit; A DI input unit which receives an operation signal of a rod mill and a cutting feeder and outputs the signal to the delay operation unit, and receives an operation signal of a load cell and outputs the signal to the first storage unit and the comparison unit; A delay operation unit configured to configure a feedback circuit of a control value from the reference control unit to the first storage unit when a predetermined time elapses from receiving the signal of the DI input unit; And a cut-off feeder driving unit for driving the cut-off feeder by receiving the set initial control value or the corrected control value. In the coke discharge control method of the cutting feeder is installed in the bottom of the hopper of the coke crushing process in the steel mill to supply the coke stored in the hopper to the rod mill side, Setting a plurality of failure rate occurrence reference values in advance; Setting an initial coke discharge amount; Measuring the weight of the crushed coke having a poor particle size, calculating the measured weight as a ratio of the weight of the crushed coke corresponding to the volume of the bucket, and comparing the crushing failure incidence reference value with the several thresholds; In the comparing step, when the deviation from any one of the several crushing failure occurrence rate reference value is increased or decreased the control value of the preset coke discharge amount, if it does not correspond to any one, maintaining the control value of the preset coke discharge amount Automatic control of coke discharge amount of the cutting feeder characterized in that consisting of. The method of claim 2, The several failure rate reference values are set in advance to 10% or more, 5% or more and less than 1%, and when the failure rate is 10% or more or 5% or more, a correction value is set from the control value of the preset coke discharge amount. And subtracting 1% and adding a correction value to a preset control value of the coke discharge amount.