JP2011174169A - Method and device for controlling layer thickness of sintering starting material for sintering machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling the layer thickness of sintering starting material for a sintering machine, which properly controls the layer thickness of the sintering starting material on the entry side of the sintering machine. <P>SOLUTION: The pre-and post-ignition furnace layer thickness on the ignition furnace entry side and the ignition furnace exit side for the sintering starting material upon a palette is detected while the conveyance speed of the palette and the feeder rotation speed of a drum feeder are detected, and a gate opening command for a split gate is obtained on the basis of: a gate opening reference value for the split gate, which is obtained from the ignition furnace entry-side layer thickness, a first opening correction value based on the palette conveyance speed and the feeder rotation speed; and a second opening correction value based on the amount of decrease from the size of the sintering starting material layer at the initiation of ignition and absorption, which is obtained from the ignition furnace entry-side layer thickness and the ignition furnace exit-side layer thickness. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sintering raw material layer thickness control method and apparatus for a sintering machine that sinters iron ore to produce sintered ore.

  At the sintering plant, iron ore, powder coke, limestone and other sintering materials are charged into the pallet of the sintering machine using a drum feeder, and the sintering material is ignited in an ignition furnace, Suction ore is produced by sucking with the main exhaust fan. The discharge part of the hopper that stores the sintering raw material to the drum feeder is provided with a divided gate that is divided in the width direction of the sintering machine and whose gate opening can be individually adjusted. The raw material layer thickness is controlled so that the strength and particle size of the produced sintered ore are uniform by adjusting the.

  As such a sintering raw material layer thickness control, for example, a detector for detecting the layer thickness of the sintering raw material is arranged immediately before the cut-off plate, and when the sintering machine is started up and the thickness of the charging raw material of the sintering raw material is set. Drum feeder rotation speed that incorporates a pattern table at startup and a pattern table at abnormal layer thickness when a certain layer thickness range is exceeded. , Control of the charging layer thickness of the Dwytroid-type sintering machine by controlling the opening thickness of the cutting gate disposed in the cutting part of the drum feeder so as to control the charging layer thickness to a predetermined thickness A method and an apparatus are known (for example, refer to Patent Document 1).

JP-A-3-243725

However, in the conventional example described in Patent Document 1, the thickness of the charged layer of the sintering material formed on the pallet of the sintering machine is detected on the upstream side of the cutoff gate on the upstream side of the ignition furnace. Since the charging layer thickness is controlled to be a predetermined thickness based on the detected charging layer thickness, the sintered raw material that has passed through the detector that detects the charging layer thickness is ignited. If the density of the sintered raw material charged is low when sucked by the main exhaust fan, even if the thickness of the charging layer is constant, the level will drop only in that part, and the charging layer thickness will be constant. There is an unresolved issue that cannot be said. Furthermore, when the rotation speed of the drum feeder which is a raw material charging device and the conveying speed of the pallet of the sintering machine are changed, there is also an unsolved problem that a delay in reaching the target layer thickness occurs.
Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and by detecting the thickness of the charging layer before and after the ignition furnace, the sintering raw material charging on the inlet side of the sintering machine is performed. It aims at providing the sintering raw material layer thickness control method and apparatus of a sintering machine which can control a layer thickness appropriately.

  In order to solve the above-mentioned problem, a sintering raw material layer thickness control method for a sintering machine according to an embodiment of the present invention includes a sintering cut out from the hopper at a discharge portion of the hopper storing the sintering raw material. A sintering raw material layer thickness control method for a sintering machine comprising a drum feeder for charging raw materials onto a pallet and a split gate that is divided in the width direction of the sintering machine and whose gate opening can be individually adjusted. Detecting the ignition furnace entrance side layer thickness level and the ignition furnace exit side layer thickness level before and after the ignition furnace of the sintered raw material on the pallet, detecting the pallet conveyance speed of the pallet and the feeder rotation speed of the drum feeder, A gate opening reference value for the split gate based on the ignition furnace entry side layer thickness level, a first opening correction value based on the pallet transfer speed and the feeder rotation speed, the ignition furnace entry side layer thickness level, and Ignition furnace A gate opening command value for the divided gate is obtained based on a second opening correction value based on a bulk reduction amount of the sintering raw material layer at the start of ignition / suction obtained from the side layer thickness level. .

  A sintering raw material layer thickness control method for a sintering machine according to another aspect of the present invention is the ignition furnace in which a plurality of the ignition furnace inlet side layer thickness levels are arranged at predetermined intervals in the width direction of the raw material layer thickness. Detected by an inlet side layer thickness level meter, the gate opening reference value is subtracted from the level setting value obtained by subtracting the ignition furnace inlet side sintered raw material layer thickness level detected at the ignition furnace inlet side. This is calculated by multiplying the distance between the charging section, the distance from the charging section of the drum feeder to the ignition furnace inlet side layer thickness level meter, and the raw material bulk density.

Further, in the sintering raw material layer thickness control method for a sintering machine according to another aspect of the present invention, the second opening correction value is set to the bulk reduction amount of the sintering raw material layer at the start of ignition / suction. It is characterized in that it is calculated by multiplying the input amount effect correction parameter.
In addition, the sintering raw material layer thickness control method for a sintering machine according to one aspect of the present invention includes mounting a sintering raw material cut out from the hopper on a pallet in a discharge portion of the hopper storing the sintering raw material. A sintering raw material layer thickness control method for a sintering machine, comprising: a drum feeder to be inserted; and a dividing gate that is divided in the width direction of the sintering machine and whose gate opening can be individually adjusted. Ignition furnace inlet side layer thickness level and ignition furnace outlet side layer thickness level before and after the ignition furnace of the binder are detected, the pallet transport speed of the pallet and the feeder rotation speed of the drum feeder are detected, and the ignition furnace inlet side layer Based on the thickness level, the pallet transfer speed and the feeder rotation speed, a basic gate opening command value is calculated in consideration of the charging amount change with respect to the divided gate, and the ignition furnace entry side layer thickness level and the ignition furnace are determined. Outer layer The gate opening correction value is obtained based on the bulk reduction amount of the sintering raw material layer at the start of ignition / suction obtained from the level, the pallet conveyance speed and the feeder rotation speed, and the basic gate opening command value is obtained as the gate. The gate opening command value is obtained by correcting with the opening correction value.

In the sintering raw material layer thickness control method for a sintering machine according to another aspect of the present invention, the ignition furnace inlet side layer thickness level and the ignition furnace outlet side layer thickness level are detected by the ignition furnace inlet side layer thickness level and point. The furnace exit layer thickness level is measured by a laser distance meter.
The sintering raw material layer thickness control device for a sintering machine according to one embodiment of the present invention also mounts the sintering raw material cut out from the hopper on the pallet in the discharge portion of the hopper storing the sintering raw material. A sintering raw material layer thickness control device for a sintering machine, comprising: a drum feeder to be inserted; and a dividing gate that is divided in the width direction of the sintering machine and whose gate opening can be individually adjusted. Ignition furnace inlet-side layer thickness level meter and ignition furnace outlet-side layer thickness level meter that detect the raw material layer thickness level before and after the ignition furnace of the sintering raw material, a transport speed detector that detects the pallet transport speed of the pallet, and the drum feeder A basic gate opening in consideration of a change in charging amount with respect to the divided gate on the basis of the rotational speed detector for detecting the rotational speed of the feeder, the layer thickness level on the ignition furnace entry side, the pallet transport speed and the feeder rotational speed. Every time A basic gate opening command value calculating unit for calculating a command value, and a bulk reduction amount of the sintering raw material layer at the start of ignition / suction determined from the ignition furnace inlet side layer thickness level and the ignition furnace outlet side layer thickness level; A gate opening correction value calculation unit that calculates a gate opening correction value based on the pallet transfer speed and the feeder rotation speed, and a gate opening based on the basic gate opening command value and the gate opening correction value A gate opening command value calculation unit for calculating the command value is provided.

Further, the sintering raw material layer thickness control device of the sintering machine according to another embodiment of the present invention is a laser distance meter in which the ignition furnace entry-side layer thickness level meter detects the ignition furnace entry-side layer thickness level, The furnace exit-side layer thickness level meter is a laser distance meter that detects the ignition furnace exit-side layer thickness level.
Further, in the sintering raw material layer thickness control device for a sintering machine according to another embodiment of the present invention, the laser distance meter is a plurality of swinging laser distance meters arranged at predetermined intervals in the width direction. It is characterized by being composed.

  According to the present invention, the gate opening command value is divided in consideration of the decrease in the sintering raw material layer thickness at the start of ignition / suction and the charging layer thickness fluctuation due to fluctuations in the pallet conveyance speed and the drum feeder feeder rotation speed. The gate opening degree of the gate can be appropriately controlled, whereby the layer thickness of the sintering raw material on the entrance side of the sintering machine can be controlled to a target value.

It is a perspective view of the sintering machine entrance side which shows one Embodiment of the sintering raw material layer thickness control method of the sintering machine of this invention. It is a block diagram which shows an example of the control apparatus which controls the gate opening degree of the division | segmentation gate in FIG. It is a block diagram which shows the other example of a control apparatus. It is a front view which shows the laser rangefinder which can be applied to this invention. It is explanatory drawing which shows the measurement principle of a laser distance meter. It is explanatory drawing which shows a layer thickness detection principle. It is a figure which shows the layer thickness profile of the width direction.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a sintering material charging portion in a sintering machine, and the sintering material is conveyed by a pallet 1 in the direction of the arrow in FIG. The direction crossing this arrow direction is defined as the width direction of the sintering machine. In the pallet 1, the sintered raw material cut out from the hopper 2 for storing the sintered raw material is charged onto the pallet 1 by the drum feeder 3 to form a sintered raw material charging layer. A total of seven divided gates 4 are arranged at equal intervals in the loading direction of the drum feeder 3 which is a discharge part of the hopper 2 in the width direction of the sintering machine.

  The gate openings of these divided gates 4 are adjusted by individually provided actuators 5, and these actuators 5 adjust the gate openings of the respective divided gates 4 according to gate opening command values from a control device described later. It is possible to increase / decrease the cutting amount of the sintering raw material at the corresponding part. Note that a cut-off plate (not shown) is disposed at the discharge portion of the drum feeder 2. This cut-off plate is a so-called leveling plate, and makes the layer thickness uniform by making up an excess portion in the layer thickness direction of the sintering raw material with an insufficient portion.

An ignition furnace 6 for igniting the sintered raw material from above is provided downstream of the drum feeder 3 by a predetermined distance in the direction of conveying the raw material. A sintering process is started by igniting the sintering raw material in the ignition furnace 6 and sucking it from a wind box below the pallet 1 by a main exhaust fan (not shown).
In the present embodiment, on the entrance side of the ignition furnace 6, the distance from the upper surface of the pallet 1 to a predetermined distance away from the surface of the total of 6 sintering material charging layers is detected, and the entrance sintering material layer thickness level is detected. Ignition furnace inlet side layer thickness level meters 7 configured by, for example, an ultrasonic distance meter or the like for detecting Lv1 are arranged at equal intervals in the width direction of the sintering machine, and the pallet 1 is also provided on the outlet side of the ignition furnace 6. The same output as the ignition furnace inlet side layer thickness level meter 7 that detects the distance from the upper surface to the surfaces of a total of six sintering raw material charging layers and detects the outgoing sintering raw material layer thickness level Lv2. Side layer thickness level meters 8 are arranged at equal intervals in the width direction of the sintering machine.

Further, as shown in FIG. 2, the control device 11 that controls the actuator 5 of each divided gate 4 includes the inlet-side sintered raw material layer thickness level Lv1 detected by the ignition furnace inlet-side layer thickness level meter 7 and the ignition furnace. The outgoing side sintering raw material layer thickness level Lv2 detected by the outgoing side layer thickness level meter 8 is input. Further, the control device 11 is connected with a conveying speed detector 12 for detecting a conveying speed of the sintering machine, that is, a pallet conveying speed Ps, and a rotational speed detector 13 for detecting a feeder rotational speed Dd of the drum feeder 3. The pallet conveyance speed Ps and the feeder rotation speed Dd detected by the containers 12 and 13 are input.
The control device 11 calculates the following equation (1) based on the input-side sintered raw material layer thickness level Lv1, the outgoing-side sintered raw material layer thickness level Lv2, the pallet transport speed Ps, and the feeder rotation speed Dd. Then, the gate opening command value Go (t) after t seconds for the actuator 5 of the divided gate 4 is calculated.

Go (t) = α [(S−Lv1 (t)) L1 · L2 · Ds + a {β (1-1 / Ps) −γ (1−Dd)}
+ B (Lv1 (t) −Lv2 (t + T)) L3 · L4 · Ds + a {β (1-1 / Ps) −γ (1−Dd)}]
……………… (1)
α: Mass-gate opening conversion coefficient [% / kg]
S: Level set value [m]
Lv1 (t): Level measurement value after t seconds [m]
L1: Each ignition furnace entrance side layer thickness level meter interval [m] before the ignition furnace
L2: distance [m] from charging section to ignition furnace entrance side layer thickness level meter installed in front of ignition furnace
Lv2 (t + T): Sintering raw material layer thickness level at the start of ignition / suction L3: Interval between each level meter [m] installed after the ignition furnace
L4: Distance [m] from ignition furnace inlet side layer thickness level meter installed before ignition furnace to ignition furnace outlet side layer thickness level meter installed after ignition furnace b: Charge amount influence correction parameter

Ds: Raw material bulk density [kg / m ³ ]
Ps: Pallet transport speed [m / s]
Dd is the drum feeder rotation speed [min ⁻¹ ]
a: Weighting parameter β: Opening conversion coefficient [% / m / s]
γ is the opening conversion coefficient [% / m / s]
The first term in [] on the right side of the equation (1) is the ignition furnace inlet side detected by the ignition furnace inlet side layer thickness level meter 7, that is, the sintering raw material layer thickness level Lv1 before starting ignition / suction. It is a sintering raw material layer mass error obtained from the difference from the level setting value S, and this sintering raw material layer mass error on the ignition furnace entrance side becomes the gate opening reference value of the divided gate 3.

  Further, the second and fourth terms in [] on the right side in the equation (1) indicate the amount of charge in the sintered raw material charged on the pallet 1 based on the pallet conveyance speed Ps and the feeder rotation speed Dd. This is the first opening correction value that corrects the influence of fluctuation. That is, the second term is a term that takes into account the influence of the sintering machine speed and the drum chute rotational speed in deriving the reference opening Gb (t), and the fourth term is the sintering in deriving the corrected opening Ga (t). This is a term that takes into account the effects of machine speed and drum chute rotation speed.

  Further, the third term in [] on the right side of the expression (1) is the ignition furnace inlet side detected by the ignition furnace inlet side layer thickness level meter 7, that is, the sintering raw material layer thickness level Lv1 before the start of ignition / suction. And the ignition raw material layer thickness level Lv2 detected at the ignition furnace outlet side layer thickness level meter 8, that is, the sintering raw material layer thickness level Lv2 at the start of ignition / suction. This is a mass value error of the sintered raw material layer multiplied by the product value of the input quantity influence correction parameter b, that is, the raw material bulk density Ds ′ at the start of ignition / suction. The opening correction value is 2. That is, since the density of the sintered raw material is increased by the ignition / suction start of the sintered raw material, and the bulk is reduced accordingly, the bulk reduction amount is obtained, and the gate opening reference value is corrected accordingly.

Then, by controlling the actuator 5 of each divided gate 4 based on the gate opening command value Go (t) calculated according to the above equation (1), the sintering charged in the charging portion on the pallet 1. The raw material can be properly controlled.
That is, according to the sintering raw material layer thickness control method of the sintering machine of the present embodiment, the gate opening reference value for the divided gate 4 based on the ignition furnace entry side layer thickness level Lv1, the pallet conveyance speed, and the feeder rotation speed At the start of ignition / suction determined from the first opening correction value based on the above, the sintering material layer thickness level Lv1 detected on the ignition furnace entry side, and the sintering material layer thickness level Lv2 detected on the ignition furnace exit side The gate opening command value Go (t) for the divided gate 4 is calculated based on the second opening correction value based on the bulk reduction amount of the sintering raw material layer.

  For this reason, it is possible to set the gate opening command value in consideration of the decrease in the sintering raw material layer at the start of ignition / suction and the variation in the charging layer thickness due to the variation in the pallet transport speed and the feeder rotation speed of the drum feeder, This gate opening command value can be properly fed back to the actuator 5 of the divided gate 4, whereby the layer thickness of the sintering raw material on the sintering machine entrance side can be properly controlled.

In addition, a plurality of layer thickness level meters for detecting the entry-side sintered raw material layer thickness level are disposed at predetermined intervals in the width direction of the raw material layer thickness, and the gate opening reference value is determined from the level set value according to the ignition furnace. The value obtained by subtracting the ignition furnace entrance-side sintered raw material layer thickness level detected on the entrance side is multiplied by the level meter interval, the distance from the charging unit of the drum feeder to the level meter, and the raw material bulk density. Since the calculation is performed, the mass error of the sintering material layer on the entry side of the point furnace can be accurately obtained.
Furthermore, since the second opening correction value is calculated by multiplying the bulk reduction amount of the sintering raw material layer at the start of ignition / suction by the charging amount influence parameter, the reduction of the sintering raw material layer at the start of ignition / suction It is possible to appropriately feed back the minute as the mass.

Further, the basic gate opening command value Gb (t) and the gate opening correction value Ga (t) are each considered in consideration of fluctuations in the charging layer thickness due to fluctuations in the pallet conveying speed and the feeder speed of the drum feeder. Since the opening degree correction value of 1 is added, the sintering raw material layer thickness at the time of charging can be accurately controlled without being affected by the charging layer thickness fluctuation.
Incidentally, the actuator 5 of each divided gate 4 is controlled only by the inlet-side sintered raw material layer thickness level Lv1 detected by the ignition furnace inlet-side layer thickness level meter 7 disposed on the inlet side of the ignition furnace 6, and divided. When adjusting the gate opening of the gate 4, the gate opening command value Go ′ (t) is calculated based on the following equation (2).
Go ′ (t) = α (S−Lv1 (t)) L1, L2, Ds (2)

  In this equation (2), the gate opening command value Go ′ (t) is calculated from the deviation of the inlet side sintered raw material layer thickness level Lv1 and level set value S on the inlet side of the ignition furnace 6 and the raw material bulk density Ds. Therefore, when the pallet conveyance speed Ps and the feeder rotation speed Dd are constant, the sintering raw material layer thickness level on the entry side of the ignition furnace 6 can be constant, but the pallet conveyance speed Ps and the feeder rotation When at least one of the speeds Dd is changed and the amount of the sintering material charged on the pallet 1 is changed, the inlet side sintering material layer thickness level Lv1 on the inlet side of the ignition furnace 6 is controlled to be constant. I can't do it.

For this reason, as shown in the following equation (3), the gate opening command value Go ″ (t) in consideration of fluctuations in the charged amount of the sintered raw material to the pallet 1 based on the pallet conveyance speed Ps and the feeder rotation speed Dd. Is calculated, it becomes possible to make the entrance side sintered raw material layer thickness level Lv1 on the entrance side of the ignition furnace 6 constant.
Go ″ (t) = α (S−Lv1 (t)) L1, L2, Ds
+ A {β (1-1 / Ps) −γ (1-Dd)} (3)
Although the entrance side sintered raw material layer thickness level Lv1 on the entrance side of the ignition furnace 6 can be made constant by the equation (3), the sintered raw material is ignited in the ignition furnace 6 and is not shown from the lower side of the pallet 1. At the start of the sintering process, the change in the exit-side sintered raw material layer thickness level on the exit side of the ignition furnace 6 when the sintering process is started by suctioning with the main exhaust fan through the wind box is not considered. It has been found that the sintering time differs depending on the thickness of the sintering raw material layer, which affects the sintering strength of the sintered ore.

  Therefore, in the present embodiment, the gate opening command value Go (t) for the actuator 5 of the divided gate 4 is calculated according to the above-described equation (1), so that the outgoing sintered raw material layer thickness level on the outgoing side of the ignition furnace 6 is calculated. By considering Lv2, it becomes possible to control the sintering raw material layer thickness level at the time of disclosure of the sintering process to be constant, and to keep the sintering strength constant without changing the sintering time. Can be maintained. Moreover, since the influence of fluctuations in the amount of the sintering material charged into the pallet 1 is also considered in consideration of the pallet conveyance speed Ps and the feeder rotation speed Dd, the sintering material layer thickness level at the start of the sintering process is set. It can be maintained more appropriately.

Here, for example, as shown in FIG. 2, the control device 11 includes a gate opening reference value calculation circuit 21 that performs the calculation of the first term in [] in the equation (1), and the [ ] A first correction value calculation circuit 22 that performs the calculation of the second term and the fourth term in [], and a second correction value calculation circuit 23 that performs the calculation of the third term in [] in the equation (1), It has.
Specifically, the gate opening reference value calculation circuit 21 calculates the following equation (4) based on the entry-side sintered raw material layer thickness level Lv1 detected by the ignition furnace entry-side layer thickness level meter 7, A gate opening reference value gb (t) representing a sintering raw material layer mass error obtained from the difference between the sintering raw material layer thickness level Lv1 and the level setting value S before ignition / suction start is calculated.
gb (t) = (S−Lv1 (t)) L1, L2, Ds (4)

Further, the first correction value calculation circuit 22 performs the calculation of the following equation (5) based on the pallet conveyance speed Ps and the feeder rotation speed Dd to correct the influence of the amount of the raw material charged into the pallet 1. A first opening correction value ga1 (t) is calculated.
ga1 (t) = a {β (1-1 / Ps) −γ (1-Dd)} (5)
Further, in the second correction value calculation circuit 23, the inlet side sintering raw material layer thickness level Lv 1 detected by the ignition furnace inlet side layer thickness level meter 7 and the outlet side sintering detected by the ignition furnace outlet side layer thickness level meter 8. Based on the raw material layer thickness level Lv2, the following equation (6) is calculated to calculate a second opening correction value ga2 (t) representing an ignition furnace outlet-side sintered raw material layer mass error.
ga2 (t) = b (Lv1 (t) −Lv2 (t + T)) L3 · L4 · Ds (6)

In addition, the control device 11 includes a gate opening reference value gb (t) output from the gate opening reference value calculation circuit 21 and a first opening correction value ga1 (from the first correction value calculation circuit 22). t) and the adder 24 for calculating the basic gate opening command value Gb (t), the second opening correction value ga2 (t) output from the second correction value calculation circuit 23, and An adder 25 for calculating a gate opening correction value Ga (t) by adding the first opening correction value ga1 (t) output from the first correction value calculation circuit 22, an adder 24, And a gate command value calculation circuit 26 that calculates a gate opening command value Go (t) based on 25 outputs Gb (t) and Ga (t).
Here, the gate command value calculation circuit 26 calculates the gate opening command value Go (t) by performing the calculation of the following equation (7), and the gate opening command value Go (t) is used to calculate the gate opening command value Go (t). The actuator 5 is controlled to adjust the opening of the divided gate 4.
Go (t) = α (Gb (t) + Ga (t)) (7)

  Thus, according to the sintering raw material layer thickness control method of the sintering machine of the present embodiment, the gate opening reference value for the divided gate 4 based on the ignition furnace entry-side layer thickness level Lv1, the pallet conveyance speed, and the feeder Ignition / suction determined from the first opening correction value based on the rotational speed, the sintering material layer thickness level Lv1 detected on the ignition furnace entry side, and the sintering material layer thickness level Lv2 detected on the ignition furnace exit side The gate opening command value Go (t) for the divided gate 4 is calculated based on the second opening correction value based on the bulk reduction amount of the sintering raw material layer at the start.

  For this reason, it is possible to set the gate opening command value in consideration of the decrease in the sintering raw material layer at the start of ignition / suction and the variation in the charging layer thickness due to the variation in the pallet transport speed and the feeder rotation speed of the drum feeder, This gate opening command value can be properly fed back to the actuator 5 of the divided gate 4, whereby the layer thickness of the sintering raw material on the sintering machine entrance side can be properly controlled.

  Also, a plurality of ignition furnace inlet side layer thickness level gauges 7 for detecting the inlet side sintered raw material layer thickness level are disposed at predetermined intervals in the width direction of the raw material layer thickness, and the gate opening reference value is set to a level. The value obtained by subtracting the ignition furnace entrance-side sintered raw material layer thickness level detected at the ignition furnace entry side from the value, the distance between the level meter, the distance from the charged portion of the drum feeder to the level meter, and the raw material bulk density Therefore, the mass error of the sintering raw material layer on the point furnace entry side can be accurately obtained.

Furthermore, since the second opening correction value is calculated by multiplying the bulk reduction amount of the sintering raw material layer at the start of ignition / suction by the charging amount influence parameter, the reduction of the sintering raw material layer at the start of ignition / suction It is possible to appropriately feed back the minute as the mass.
Further, the basic gate opening command value Gb (t) and the gate opening correction value Ga (t) are each considered in consideration of fluctuations in the charging layer thickness due to fluctuations in the pallet conveying speed and the feeder speed of the drum feeder. Since the opening degree correction value of 1 is added, the sintering raw material layer thickness at the time of charging can be accurately controlled without being affected by the charging layer thickness fluctuation.

  In the above-described embodiment, the control device 11 includes the gate reference value calculation circuit 25, the first correction value calculation circuit 22, the second correction value calculation circuit 23, the adders 24 and 25, and the gate command value calculation circuit 26. Although the case where it comprised is demonstrated, it is not limited to this, You may make it comprise as shown in FIG. That is, the gate reference value calculation circuit 21, the first correction value calculation circuit 22, and the adder 24 are integrated to form the basic gate opening command value calculation circuit 31, and the second correction value calculation circuit 23. , The first correction value calculation circuit 22 and the adder 25 are integrated to form a gate opening correction value calculation circuit 32, and a basic gate opening command value Gb output from the basic gate opening command value calculation circuit 31. (t) and the gate opening correction value Ga (t) output from the gate opening correction value calculation circuit 32 may be supplied to the gate command value calculation circuit 26.

In this case, the basic gate opening command value calculation circuit 31 performs the calculation of the following equation (8) based on the entry-side sintered raw material layer thickness level Lv1, the pallet conveyance speed Ps, and the feeder rotation speed Dd to change the charging amount. The basic gate opening command value Gb (t) taking into account is calculated.
Gb (t) = (S−Lv1 (t)) L1, L2, Ds
+ A {β (1-1 / Ps) −γ (1-Dd)} (8)
In the gate opening correction value calculation circuit 32, the calculation of the following equation (9) is performed based on the entrance side sintering material layer thickness level Lv1, the exit side sintering material layer thickness level Lv2, the pallet conveying speed Ps and the feeder rotation speed Dd. The gate opening correction value Ga (t) after t seconds is calculated.
Ga (t) = b (Lv1 (t) −Lv2 (t + T)) L3 · L4 · Ds
+ A {β (1-1 / Ps) −γ (1-Dd) (9)

Moreover, in the said embodiment, although the case where an ultrasonic distance meter was applied as the entrance layer thickness level meter 7 and the exit layer thickness level meter 8 was demonstrated, it is not limited to this and is shown in FIG. Laser distance meters LD1 to LD5 can be applied.
Here, the laser distance meters LD1 to LD5 are configured to scan in a swinging manner at a fixed point. The swing type is a method in which a laser rangefinder installed at a fixed position is rotated within the cross section in the width direction and scanned on a line while changing the projection position of the laser beam. This is called a swinging laser rangefinder. Since this swinging laser rangefinder only rotates at a fixed position, the load on the apparatus drive system is small and it is extremely advantageous in terms of durability. Furthermore, it is also possible to divide the section in the width direction and synchronize a plurality of laser distance meters to scan in a swinging manner at a fixed point. When the head is swung by one laser distance meter, it is necessary to install the laser distance meter at a high position above the sintering machine in order to scan the entire width of the sintering machine pallet 1. The reason is that when the laser beam is projected from a low position, a shadow portion where the laser beam does not hit is generated due to the angle of the inclined surface formed by the charged raw material, and a portion where measurement is impossible occurs.

  This principle will be described with reference to FIG. FIG. 5A shows a situation in which laser light is projected from a low position by the laser distance meter LD. Since the angle of repose of the sintered raw material 42 is about 50 ° at the maximum, in this case, the black position is the non-measurable region 43. In order to eliminate the non-measurable region 43, it is necessary to measure in a range of a depression angle larger than that (for example, a depression angle of 60 ° or more). For this purpose, as shown in FIG. A high position is required for the installation position. In particular, since there are many opportunities for the raw material to form a high-angle slope in the sidewall portion, it is preferable to arrange the laser distance meter LD at a position close to the sidewall directly in order to increase the depression angle of the laser beam.

  If installation at such a high position is difficult due to facilities, if the section in the width direction of the sintering machine pallet 1 is divided and scanned by a plurality of laser rangefinders LD, It is possible to lower the installation position. The height of the laser distance meter LD from the surface of the sintering raw material is 0.8 to 4.5 m, preferably 0.8, depending on the limit of the measurement range of the laser distance meter LD, taking a large depression angle of the laser beam. It is desirable to install in ~ 2m. When scanning with multiple units, synchronize the rotational movement of the laser rangefinder LD and scan the entire width direction at a time in a short time, so that the traveling distance of the sintering machine pallet during the scanning time is extremely short. The deviation due to the pallet progression can be substantially ignored. It is better that the time required for one scan is short, and in reality, 10 seconds or less is desirable.

In the distance measurement by the laser distance meter LD, the distance is measured from the change in the incident angle of the reflected light to be detected with respect to the projection light. Therefore, when the laser distance meter is installed at a low position close to the surface of the raw material, a large change in the incident angle is detected. Therefore, it becomes easy to detect the angle change due to the minute distance change, and the effect of improving the accuracy of distance measurement can be obtained.
Therefore, as shown in FIG. 4, a frame 45 is disposed extending in the width direction above the charging layer of the sintering machine pallet 1, and a rotating mechanism is provided on one of the front and rear surfaces of the frame 45, for example, the rear surface. Laser distance meters LD1 to LD5 are mounted on the laser heads LH1 to LH5, and the laser heads LH1 to LH5 are rotated synchronously within a predetermined angle range by the distance meter controller 47.

  This predetermined angle range is selected so that the laser distance meters LDj (j = 1 to 4) and LDj + 1 adjacent to each other overlap on the charging layer at the intermediate position. In this way, when the plurality of laser distance meters LD1 to LD5 are swung in a swinging manner, the laser distance meters LD1 to LD5 only rotate at a fixed position, so the load on the apparatus drive system is small and durable. Very advantageous. Furthermore, by rotating the plurality of laser distance meters LD1 to LD5 synchronously and scanning them in a swinging manner, it is possible to measure the layer thickness of the entire loading layer in the width direction by one scanning. In this case, in the adjacent laser distance meters LD1 to LD5, for example, by aligning all the rotation start position angles to the maximum angle on one side of the rotation range, the laser light emitted from one of the adjacent laser distance meters It is preferable to reliably prevent the light from entering the other adjacent laser distance meter.

When these laser distance meters LD1 to LD5 are used, the measurement location can be limited to a spot of several mm because of its high convergence, so that the position can be specified and measured. By scanning the laser distance meters LD1 to LD5 in the width direction of the sintering machine pallet 1 and measuring the layer thickness of the charging layer, a profile of the layer thickness accurately measured at each position in the width direction is created. It becomes possible.
Thus, when scanning with a plurality of laser rangefinders LD1 to LD5 in a swinging manner, the height from the upper surface of the charging layer 9 takes a large depression angle of the laser beam and is within the measurement range of the rangefinder. It is desirable to install at 0.8 to 4.5 m, preferably 0.8 to 2 m depending on the limit.
In addition, when scanning with multiple units, the pallet travel distance during the scanning time can be made extremely short by synchronizing the rotation of the laser rangefinder and scanning all sections at once in a short time. The displacement due to the pallet progression can be substantially ignored. It is better that the time required for one scan is short, and in reality, 10 seconds or less is desirable.

Here, the distances L1 to L5 measured by the laser distance meters LD1 to LD5 and the rotation angles θ1 to θ5 with respect to the perpendicular passing through the rotation centers of the laser heads LH1 to LH5 at that time are the distance meter control devices described above. 47, the distance meter controller 47 calculates the following formulas (10) and (11) to calculate the measurement position Wk (k = 1 to 5) and the material thickness Hk in the width direction.
Wk = WBk + Lk * sin θk (10)
Hk = HL−Lk * cos θk (11)
Here, WBk is a distance from one end which is a reference point in the width direction of the rotation center point of each laser distance meter LDk, Lk is a measurement distance measured by each laser distance meter LDk, and θk is a rotation center of each laser head LHk. Is an elevation angle with respect to a perpendicular passing through the reference point side, and the reference point side is a negative value, and the opposite side of the reference point is a positive value. HL is the measurement origin of the laser distance meters LD1 to LD5, that is, the height from the upper surface of the sintering machine pallet 1 at the rotation center of the laser heads LH1 to LH5.

  Then, the distance meter control device 47 stores the calculated measurement position Wk and the raw material layer thickness Hk as a pair in the storage unit, and creates a layer thickness profile in the width direction. At this time, with respect to the surface position of the charging layer overlapped by the adjacent laser distance meters LD1 to LD5, the width direction position Wk and the raw material with less change between the measured width direction position and the previous width direction position. The layer thickness Hk is selected.

  That is, as shown in FIG. 6, the laser distance meter LDj + 1 has a steep inclined surface on the laser distance meter LDj side at the intermediate position between the laser distance meters LDj and LDj + 1, and a relatively gentle inclined surface protrusion on the opposite laser distance meter LDj + 1 side. In the case where the portion 48 is present, the laser distance meter LDj can measure all the distances including the top of the protrusion 48, but the laser distance meter LDj + 1 has a steep portion beyond the top of the protrusion 48. Since the inclined surface cannot be captured, the distance of the far flat portion is measured, and a large error occurs in the width direction position Wj + 1 (n) and the raw material layer thickness Hj + 1 (n), and the previous width direction position Wj + 1 ( The amount of change ΔW with respect to n-1) increases rapidly. Therefore, the width direction position Wj (n) and the raw material layer thickness Hj (n) based on the measurement value of the laser distance meter LDj with a small amount of change ΔW in the width direction position are selected.

In this way, the width direction profile of the layer thickness Hk in the width direction of the charging layer shown in FIG. 7 is measured every predetermined time (for example, 10 minutes), and the measured width direction profile of the layer thickness Hk is a distance meter control. The data are sequentially stored in a storage unit 47 a provided in the device 47.
And the average value of the width direction area | region corresponding to each division | segmentation gate 4 is calculated from the width direction profile of layer thickness Hk memorize | stored in the memory | storage part 47a, and this is supplied to the control apparatus 11 as layer thickness level Lv1 and Lv2.

  DESCRIPTION OF SYMBOLS 1 ... Pallet, 2 ... Hopper, 3 ... Drum feeder, 4 ... Divided gate, 5 ... Actuator, 6 ... Ignition furnace, 7 ... Inlet side layer thickness level meter, 8 ... Outlet layer thickness level meter, 11 ... Control device, DESCRIPTION OF SYMBOLS 12 ... Pallet conveyance speed detector, 13 ... Feeder rotational speed detector, 21 ... Gate opening reference value calculation circuit, 22 ... 1st correction value calculation circuit, 23 ... 2nd correction value calculation circuit, 24, 25 ... Adder, 26 ... Gate command value calculation circuit, 31 ... Basic gate opening command value calculation circuit, 32 ... Gate opening correction value calculation circuit, LD1-LD5 ... Laser distance meter, LH1-LH5 ... Laser head, 45 ... Frame 47 ... Distance meter control device, 47a ... Storage section

Claims (8)

Drum feeder for loading sintered raw material cut out from the hopper onto the pallet, and the gate opening can be adjusted individually in the width direction of the sintering machine at the discharge part of the hopper for storing the raw material. A method for controlling a sintering material layer thickness of a sintering machine equipped with a split gate,
Ignition furnace inlet side layer thickness level and ignition furnace outlet side layer thickness level before and after the ignition furnace of the sintered raw material on the pallet,
Detecting the pallet conveyance speed of the pallet and the feeder rotation speed of the drum feeder;
A gate opening reference value for the split gate based on the ignition furnace entry side layer thickness level, a first opening correction value based on the pallet transfer speed and the feeder rotation speed, the ignition furnace entry side layer thickness level, and Obtaining a gate opening command value for the divided gate based on the second opening correction value based on the bulk reduction amount of the sintering raw material layer at the start of ignition / suction determined from the ignition furnace outlet layer thickness level; A method for controlling the thickness of a sintering material layer of a sintering machine. The ignition furnace entry side layer thickness level is detected by a plurality of ignition furnace entry side layer thickness levels arranged at predetermined intervals in the width direction of the raw material layer thickness,
The gate opening reference value is set to a value obtained by subtracting the ignition furnace entrance-side sintered raw material layer thickness level detected on the ignition furnace entrance side from the level setting value, and the level meter interval and the drum feeder insertion The sintering raw material layer thickness control method for a sintering machine according to claim 1, wherein the calculation is performed by multiplying a distance from a part to the ignition furnace inlet side layer thickness level meter and a raw material bulk density.   The second opening degree correction value is calculated by multiplying the bulk reduction amount of the sintering raw material layer at the start of ignition / suction by a charging amount influence correction parameter. Sintering raw material layer thickness control method of a sintering machine. Drum feeder for loading sintered raw material cut out from the hopper onto the pallet, and the gate opening can be adjusted individually in the width direction of the sintering machine at the discharge part of the hopper for storing the raw material. A method for controlling a sintering material layer thickness of a sintering machine equipped with a split gate,
Ignition furnace inlet side layer thickness level and ignition furnace outlet side layer thickness level before and after the ignition furnace of the sintered raw material on the pallet,
Detecting the pallet conveyance speed of the pallet and the feeder rotation speed of the drum feeder;
Based on the ignition furnace entry side layer thickness level, the pallet transport speed and the feeder rotation speed, a basic gate opening command value is calculated in consideration of a change in charging amount with respect to the divided gate, and the ignition furnace entry layer Obtain a gate opening correction value based on the bulk reduction amount of the sintering raw material layer at the start of ignition / suction determined from the thickness level and the ignition furnace outlet layer thickness level, the pallet conveyance speed and the feeder rotation speed, A sintering material layer thickness control method for a sintering machine, wherein the basic gate opening command value is corrected with the gate opening correction value to obtain a gate opening command value.   2. The ignition furnace inlet side layer thickness level and the ignition furnace outlet side layer thickness level are detected by a laser distance meter with respect to the ignition furnace inlet side layer thickness level and the ignition furnace outlet side layer thickness level. 5. A sintering raw material layer thickness control method for a sintering machine according to any one of items 1 to 4. Drum feeder for loading sintered raw material cut out from the hopper onto the pallet, and the gate opening can be adjusted individually in the width direction of the sintering machine at the discharge part of the hopper for storing the raw material. A sintering material layer thickness control device for a sintering machine equipped with a split gate,
Ignition furnace inlet side layer thickness level meter and ignition furnace outlet side layer thickness level meter that detect the raw material layer thickness level before and after the ignition furnace of the sintered raw material on the pallet,
A conveyance speed detector for detecting a pallet conveyance speed of the pallet and a rotation speed detector for detecting a feeder rotation speed of the drum feeder;
A basic gate opening command value calculation that calculates a basic gate opening command value in consideration of a change in the charging amount with respect to the divided gate based on the ignition furnace entry side layer thickness level, the pallet transfer speed and the feeder rotation speed. And
Based on the bulk reduction amount of the sintering raw material layer at the start of ignition / suction obtained from the ignition furnace inlet side layer thickness level and the ignition furnace outlet side layer thickness level, the pallet transfer speed, and the feeder rotation speed, A gate opening correction value calculation unit for calculating a degree correction value;
A sintering material layer thickness of a sintering machine, comprising: a gate opening command value calculation unit that calculates a gate opening command value based on the basic gate opening command value and the gate opening correction value Control device. The ignition furnace entry-side layer thickness level meter is a laser distance meter that detects the ignition furnace entry-side layer thickness level,
The sintering raw material layer thickness control device for a sintering machine according to claim 6, wherein the ignition furnace outlet layer thickness level meter is a laser distance meter that detects the ignition furnace outlet layer thickness level.   The sintering raw material layer of the sintering machine according to claim 7, wherein the laser distance meter is composed of a plurality of swinging laser distance meters arranged at predetermined intervals in the width direction. Thickness control device.

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