JPS581008A - Transporting method for raw material into blast furnace top by belt conveyor - Google Patents

Abstract

PURPOSE:To improve the raw material charging capacity in a blast furnace by adjusting the space between the raw materials to be conveyed by a belt conveyor in the case of storing the same raw materials continuously and in the case of charging separate materials into furnace top hoppers. CONSTITUTION:In the stage of deliverying charging raw materials from hoppers 1A-1D on the ground onto a belt conveyor 2, it is assumed that, for example, the charge partterns C, C , C , O, O are incorporated. The first C, C are stored continuously into the same furnace top hopper 4B and therefore the space l1 between the coke C1 to be conveyed first and the coke C2 to be conveyed in succession to the coke C1 on the conveyor 2 is substantially unnecessary. However, the coke C3 to be conveyed next is charged independently of the portion by one time into the hopper 4A and therefore it is necessary to provide a space l2 between the coke C3 and the coke C2. In the stage of delivering ore O, a space between the same and the coke C3 is required but there is no need for a transport spacing between the ores O and O.

Description

[Detailed description of the invention] This relates to a method of transporting raw materials.

A plurality of top hoppers are installed at the top of the blast furnace, and multiple hoppers are installed above ground to cut out charging materials by brand such as iron ore, coke, etc., and the charging materials cut from these hoppers are transferred to a belt. A blast furnace top charging device is known that transports to the top of the furnace using a conveyor and charges the blast furnace top hoppers alternately into the plurality of top hoppers.

When the charging material is transported to the top of the furnace using such a device, based on a predetermined time schedule,
This is done by cutting specified raw materials intermittently onto a belt conveyor from multiple hoppers installed on the ground.

For example, when charging raw materials with a charge pattern of C, C↓・C↓,0,O↓ (C is coke, 0 is ore, and ↓ is the symbol for dump), coke is charged twice in succession at the top of the furnace. After charging into the hopper, the raw materials for two batches are dumped together,
The charging cycle consists of dumping one batch of coke, then dumping two batches of ore. When raw materials are cut out and transported at predetermined intervals, and these raw materials are charged into the furnace top hopper (C, C).

(0) and (0,0) were charged in batches alternately through a switching chute j.

If the rollers are (C, O) and (0, 0), the coke is dumped in two consecutive batches and the ore is also dumped in two consecutive batches. There is no need to transport at intervals.

Since raw material charging in the blast furnace is performed based on the charging schedule, the charging capacity is determined by how many charges can be charged per day.

Since the raw material transportation time per charge cannot be easily changed due to the equipment, if the cutting time can be shortened by the amount of time that does not require cutting at intervals, the raw material charging capacity will be improved.

The present invention was made in view of the above situation, and is a system in which charging raw materials such as iron ore and coke are intermittently cut out from a plurality of hoppers installed on the ground and placed on a belt conveyor. In the method of alternately charging the furnace top hoppers, only when the raw materials cut from multiple hoppers onto the belt conveyor are continuously charged into the same furnace top hopper, the subsequent belt conveyor This method is characterized in that the timing of cutting the charged raw material to be cut upward is earlier than the normal cutting timing, thereby reducing the distance between the raw materials on the belt conveyor and transporting the raw materials.

The sixth invention will be explained below based on the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

The present invention provides a plurality of hoppers/hoppers installed on the ground.
A, /B, 10. Charged raw materials such as iron ore and coke are intermittently cut from /D onto belt conveyor λ and stored alternately in multiple top hoppers +A and IIB provided at the top of blast furnace 3. Top hopper IIA,
In the method of alternately charging raw materials into the furnace from IIB, when cutting raw materials from hopper/A-/D onto belt conveyor 2, for example, C, O↓, C↓, 0,0 When performing the charge pattern ↓, the first C9C is stored in the same top hopper tIB, so the distance between the coke q conveyed first and the coke O conveyed subsequently on the belt conveyor λ is 4 is not really necessary.

However, since one batch of coke C8 to be transported next is charged individually into the furnace top hopper 4 (A), it is necessary to transport the coke C8 with an interval of lz between it and the coke C2 transported earlier.

The optimum value of this interval 12 is determined in advance depending on the blast furnace, and requires, for example, about aS seconds. When the first ore (0.0) to be cut out next is cut out, an interval equivalent to the above 12 is required between it and the preceding coke C8, and the subsequent ore is cut out in the same furnace. Since the ore is stored in the top hopper, there is no need for an interval between the transportation of ore. In other words, the present invention is applicable when transporting coke and ore on a belt conveyor to the top hopper, when the same raw material is continuously stored, and when it is charged into another top hopper! The purpose is to adjust the distance between the raw materials to be conveyed during conveyance by a belt conveyor.

FIG. 2 is an explanatory diagram illustrating the raw material cutting timing according to the present invention.

In FIG. 2, the clock pulse generator 6 outputs clock pulse signals P1 to P u to the belt conveyor rotating at a constant speed to the right in the drawing. The rear end position of the raw material on the conveyor is determined from the simulator signal generator/S to st +y 5I
Understand it as L4. Then, the preceding coke O1 and the next coke C cut out from any of the hoppers /A to /D! If the coke C is stored in the same top hopper, the timing of the clock pulse signal P2, that is, the preceding coke C
By cutting the raw material from the hopper at the position where the rear end of 1 reaches 84, the interval between the raw materials on the belt conveyor is set to 11, and then when cutting out the coke Os,
At the time of clock pulse m No. P 8, that is, when the rear end of the preceding coke C8 has advanced to the position 816 on the belt conveyor λ, the coke C8 is cut out from the hopper/D, and the belt is separated from the preceding coke C2. The material interval on the conveyor λ is set to 6, which corresponds to f5 seconds, for example. In the figure, hoppers /A~'/D are
If the belt conveyors are arranged side by side in the width direction and have a common cutting port, the above-mentioned 11. This is advantageous for accurately adjusting the value of ls. The pulse signals p, x Pts and the signals 81 to 824 representing the position can be simulated in a computer in accordance with the rotating speed of the belt conveyor 2.

Next, the timing of cutting out raw materials from hoppers /A-/D will be explained based on FIG. 3.

FIG. 3 is a circuit diagram showing an embodiment of the present invention.

In FIG. 3, a simulator signal generator/S, knot elements NBA, NGD, z, and a changeover switch are shown.

A circuit in which AND elements ANA are arranged in series is well known. In this circuit, a signal ``do'' is input to the AND element ANA by the signal 5i11 which is generated from the end of the preceding raw material by the pulse signal P8 from the simulator signal generator /S, and the signal /θ indicating whether or not the raw material discharge is possible is input. At the same time, AND element ANA
When a raw material discharge command is inputted to , C enters ANA, and the raw material discharge command is sent to the ground hopper /A-/D, so the raw material interval on the belt conveyor always takes a value of 12.

The circuit according to the present invention is shown surrounded by dotted lines, and branches into NAND elements NGD-, ? A memory element FFA is provided, and this memory element FF'A
From ゛ to NAND element NGD-,? input a signal to.

The memory element PF"A has the function of obtaining the sl or s2 signal from the transmitter Is and storing the code in the memory element FFA. When both the two signals input to the NAND element NGD-t are "do", the memory The simulator signal s4 and the schedule setting signal // are input to the 0 NAND element NGD-/, which has the function of resetting and outputting "°0". Otherwise, the output will be "do". The changeover switch is for switching between the conventional circuit and the circuit according to the present invention, and is used when switching to control based on the conventional circuit when an abnormality occurs in the circuit according to the present invention.

If the changeover switch l is now in the lower blade position, the simulator-signal generator /j simulates the rear end position of the preceding material being transported on the belt conveyor from sl to 824, and sends a signal to the knot element NBA. Enter as 2/. This signal indicates that the rear end position of the preceding material is s, ””
The value is 0'' up to the value of S15, and the value is ``do'' at the value of sia. On the other hand, when the rear end position of the preceding material is sl and sz, a signal of 1" is inputted to the memory element FFA by the signals n and B, respectively, and either or both of the signals n and B is input into the memory element FFA. Furthermore, the signal 2 is input from the simulator signal generator/S to the NAND element NGD-/, and this signal 2 becomes "1" when the rear end of the preceding material is 84. ° is a signal that is input to the NAND element NGD-t, and the signal // is a charging schedule setting signal. When the signal 2 is emitted to the NAND element NGD-/, and the signal // also takes the value 1, the NAND element NGD-/ outputs a signal of 0°, and the signal /2 A reset signal is input from
", and the output from the memory element FFA is 0"
It is.

When discharging the raw materials to a normal interval lQ, the signal 2/ is 0'' until the simulator signal S16, but at the signal 816, the knot element NB
At this time, the output from the NOT element NBA becomes "0", and this output signal B is input to the NAND element NGD-.
Enter J. On the other hand, the signal /l in the memory element FFA is
Since "do" is not input, "do" is held and the NAND element N
Do is output to GD-j by signal 2B, and NAND element N
GD-J outputs "do" and the AND element ANA outputs,
This “indicates that there is no abnormality in the de and interlock signal/θ”
Then, the next discharge signal is output from the AND element ANA, and the raw material is cut onto the belt conveyor 2.

Next, a case will be described in which subsequent raw materials are discharged at intervals of 11.

In this case, when the rear end of the preceding raw material is 84 in the signal 2, "■" is entered in the NAND element NGD-/, and since the schedule setting signal l/ is also "1", the memory element FFA is
Since the memory element FFA and the NAND element N0D-3 input a signal of "1" to the AND element ANA, the next raw material discharge signal is generated. That is, the raw material is discharged such that the distance from the leading raw material is 11.

As described above, according to the present invention, when raw materials are transported intermittently by a belt conveyor and charged alternately into a plurality of furnace top hoppers provided at the furnace top, the raw materials are continuously charged into the same furnace top hopper. Since the raw material transportation interval can be shortened when the blast furnace is used, the raw material hoisting capacity in the blast furnace can be increased, and it is possible to deal with cases where rapid raw material charging is required due to furnace conditions, and also has the effect of reducing equipment costs. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram illustrating the raw material cutting timing according to the present invention, and FIG. 3 is a hoof diagram showing an embodiment of the present invention.

Claims (1)

[Claims] A method in which charging materials such as iron ore, coke, etc. are cut intermittently onto a belt conveyor from multiple hoppers installed on the ground, and then alternately charged into multiple furnace top hoppers. Only when charging material to be cut onto the belt conveyor is continuously charged into the same furnace top hopper, the cutting timing of the charging material to be subsequently cut onto the belt conveyor is made earlier than the normal cutting timing. A method for transporting raw materials to the top of a blast furnace using a belt conveyor, which is characterized by transporting raw materials with reduced intervals between the raw materials.