JP2855817B2 - Raw material charging method for raw material tank - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for charging a raw material into a raw material tank provided in a steel mill or the like, and more particularly, to a method for charging a raw material into a plurality of raw material tanks for temporarily storing the raw material. And a method for charging a raw material into a raw material tank.

[Conventional technology]

Conventionally, when charging a raw material into a plurality of raw material tanks, an upper limit value and a lower limit value of the amount (stock amount) of the raw material stored in the raw material tank are determined, and the lower limit is determined in the order of the number assigned to each raw material tank. Inspect whether the stock amount is lower than the value, and if it is lower, charge the raw materials until the upper limit is reached, and if the stock amount of all the raw material tanks exceeds the lower limit, sequentially start the respective raw material tanks. Until the upper limit is reached.

FIG. 2 is a block diagram showing a configuration of a raw material charging apparatus to which a conventional raw material charging method is applied.

Five material tank 1 ₁ to 1 _5, an opening portion for charging the top of the raw material each form, also is the raw material cutout device for feeding the raw material to the next step attached to the lower, in a row It is provided continuously. Inside of each raw material tank 1 ₁ to 1 _5, at a position corresponding to the normal upper limit value and the lower limit value of the amount of stock material allowed during each full amount switches 21 ₁ to 21 ₅ and the air quantity switches 22 ₁ - 22 ₅ are provided. Full switch 21
₁ to 21 _5, it reaches the upper limit amount of the raw material inventory amount, and sends a full signal to the sequence control unit 23, air volume switch 22 ₂₁ to
Reference numeral ₂₅ indicates that an empty signal is sent to the sequence controller 23 when the stock amount of the raw material falls below the lower limit.

Above the raw material tank 1 ₁ to 1 _5, traveling device with a belt conveyor 8 which travels driven by the driving motor 11 is provided, running the material from further raw material supply source is above the traveling device with Berutokobeya 8 not shown A belt conveyor 7 is provided for transporting the apparatus onto a belt conveyor 8 with a device. By controlling the drive motor 11, the end on the discharge side of the belt conveyor 8 with the traveling device is positioned immediately above one of the openings of the raw material tanks ₁₁ to ₁₅ , and the raw material tank is placed in the raw material tank. Will be charged.

The sequence control unit 23, for each raw material tank 1 ₁ to 1 _5, checks whether empty signal described above in the order has been sent, when being sent if the raw material tank and controls the drive motor 11 The raw material is charged until a full signal is detected. Once detects no empty signal for all the raw material tank 1 ₁ to 1 _5, the raw material tank that does not send the full signal among these raw materials tank 1 ₁ to 1 _5, in order to detect a full signal The drive motor 11 is controlled so that the raw materials are charged until the start. When all of the raw material tank 1 ₁ to 1 ₅ adapted to deliver full signal, and controls the material supply source (not shown), was supposed to end the raw material charging operation.

[Problems to be solved by the invention]

In the conventional raw material charging method described above, when the overall stock level is low, the raw materials are charged to the upper limit at a stroke for each raw material tank. It is disadvantageous in that it is apt to occur, and that particle size uneven distribution is likely to occur in the raw material tank. Furthermore, while the raw material is being charged from near the lower limit to the upper limit in one raw material tank, the stock amount in the other raw material tank is significantly lower than the lower limit, and the next process from the raw material tank is performed. Supply of raw materials is not smoothly carried out, resulting in lower production capacity, lower efficiency,
Furthermore, there is a drawback that a situation where operation is stopped may be caused.

To avoid such drawbacks, regardless of automatic driving,
It is conceivable that the operator inserts the raw materials by manual control while estimating the stock amount of each raw material tank, but there is a disadvantage that the operation is complicated because of the manual operation.

An object of the present invention is to provide a raw material tank in which a plurality of raw material tanks are charged with no imbalance in the stock amount between the raw material tanks, a raw material tank that is significantly below the lower limit does not occur, and particle size unevenness occurs. It is possible to perform automatic operation without performing. An object of the present invention is to provide a method of charging a raw material into a raw material tank.

[Means for solving the problem]

The method for charging a raw material into the raw material tank according to the present invention is characterized in that one or more automatic raw materials are stored between a lower limit level, which is a lower limit of the amount of raw material stored in each raw material tank, and an upper limit level, which is an upper limit of the amount. Setting an operation intermediate level, setting a first offset value and a second offset value, measuring the amount of the raw material stored in each of the raw material tanks, and setting the one or more automatic operation intermediate Among the levels, a raw material tank in which the amount of stored raw material is smaller than the value obtained by subtracting the first offset value from the value of the minimum automatic operation intermediate level is determined, and the raw material tank having the least amount of raw material is determined for the raw material tank. The raw materials are sequentially charged from the raw material tank until the value of the minimum automatic operation intermediate level becomes the value obtained by adding the second offset value to the minimum automatic operation intermediate level. Automatic driving intermediate level Once the operation is finished which it was, is charged with raw material to each of the respective material tanks to reach the upper level.

[Action]

One or more automatic operation intermediate levels are set between the upper limit level and the lower limit level, and the inventory amount is smaller than a value obtained by subtracting the first offset value from the automatic operation intermediate level from the smaller automatic operation intermediate level. The raw material is charged into the raw material tank until the value reaches the value obtained by adding the second offset value to the intermediate level of the automatic operation, so that the raw material is not charged at once from the lower limit level to the upper limit level. , There will be no unbalance of stock between raw material tanks,
A raw material tank that is significantly lower than the lower limit level is not generated, and particle size uneven distribution does not occur.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a raw material charging apparatus to which an embodiment of a method for charging a raw material into a raw material tank according to the present invention is applied.

This raw material charging apparatus includes five raw material tanks ₁₁ to ₁₅ provided continuously in a row and a raw material tank 11 above the raw material tanks ₁₁ to _15.
A belt conveyor 8 with a traveling device for charging the raw material into any of ₁₁ to ₁₅ and a raw material supplied from a raw material supply source (not shown) above the belt conveyor 8 with the traveling device on the belt conveyor 8 with the traveling device Conveyor 7 for feeding to
When a drive motor 11 for driving and moving the traveling device equipped with a belt conveyor 8, the stock amount calculation unit 5 for calculating an amount (stock amount) of the raw materials that are currently stored in each raw material tank 1 ₁ to 1 ₅ When,
It has an automatic operation setting unit 2 and a sequence control unit 6. In the case of the present embodiment, the raw material tank ₁₁ contains the raw material A and the raw material tank ₁₂
Material B is found in the raw material tank 1 ₃ to 1 ₅ shall raw material C is charged, respectively. Further, the raw material charging process of the raw material tank of the present invention, the raw material tank 1 ₃ raw material C is charged the same raw material
~ ₁₅ has been applied. This is because the present invention is particularly effective when the same raw material is charged into a plurality of raw material tanks.

At the top of each raw material tank 1 ₁ to 1 ₅ is formed an opening for charging the raw material, also the amount of raw material fed from the material cutout device and raw material cutout device (not shown) in the lower portion to the next step raw payout amount measuring unit ₄₁ to ₅ to be measured, respectively. Inside of each raw material tank 1 ₁ to 1 _5, inventory correcting level switch 91 _to 93 ₅ to the upper limit level position to be described later
There are provided respectively, further, the position of the raw material in any case should not be charged any more very full amount level switch 10 ₁ to 10 ₅ are provided. Stock correcting level switch 91 _to 93 _5, the detection and correct full amount signal and sends it to the inventory amount computation unit 5 this if the raw materials to the provided position is charged respectively. Each of the emergency level switches 10 ₁ to 10 ₅ detects when a raw material has been charged to the position where it is provided, and sends an emergency level signal to the inventory operation section 5 and the sequence control section 6. .

The belt conveyor 8 with a traveling device is driven to travel by a driving motor 11, and the discharge-side end of the belt conveyor 8 has a raw material tank ₁₁ to _15.
Is located just above one of the openings. In addition, even if the discharge-side end of the belt conveyor with traveling device 8 is directly above any of the openings, the raw material transported by the belt conveyor 7 falls on the belt conveyor with traveling device 8. I have. As a result, by controlling the driving motor 11, feedstock is charged to any of the raw material tank 1 ₁ to 1 _5. The belt conveyor 7 is provided with a raw material input amount measuring unit 3 for measuring the amount of the raw material transported by the belt conveyor 7.

The stock amount calculating unit 5 integrates the amounts of the raw materials charged into the raw material tanks ₁₁ to _{15 based} on the signal from the sequence control unit 6 and the measured value of the raw material input amount measuring unit 3, and also calculates each raw material discharge amount. Measuring unit
41 _to the ₅ measurements by integrating the amount of material cut out from the raw material tank 1 ₁ to 1 _5, the current for each raw material tank 1 ₁ to 1 ₅ by subtracting these integrated values The inventory amount is calculated and notified to the sequence control unit 6. Since an error on integration is prevented from accumulating, inventory amount computation unit 5, upon receiving the modified full amount signal from the inventory for correction level Sun switch 91 _to 93 _5, inventory for that raw material tank The amount is updated to the value of the upper limit level described later. Further, when receiving a very full amount signal from the very full amount level switch 10 ₁ to 10 ₅ updates the inventory amount of the raw material tank to a value corresponding to the position provided with the said very expiry level switch.

The automatic operation setting section 2 sets three automatic operation intermediate levels between an upper limit level and a lower limit level described later for _three raw material tanks 13 to ₁₅ into which the same raw material is charged. In this case, assuming that the lower limit level is L and the upper limit level is H, the respective automatic driving intermediate levels are as follows: Is represented by Then, the automatic operation setting unit 2 notifies the sequence control unit 6 of the set automatic operation intermediate level. Further, the first and second offset values are input from the outside, and this is notified to the sequence control unit 6. The sum of the two offset values must be smaller than the interval between the automatic driving intermediate levels.

The sequence control unit 6, as well as to the raw material to any of the raw material tank 1 ₁ to 1 ₅ controls the drive motor 11 and the raw material supply source (not shown) is charged, and the raw material is currently charged The stock amount calculation unit 5 is notified of the material tank. Further, when the very full amount signal from any one of the very full amount switches 10 ₁ to 10 ₅ are sent controls the raw material supply source (not shown) so as to stop all the loading operations.

Further, the sequence control unit 6 always receives a notification about the current stock amount from the stock amount calculation unit 5 for the _three material tanks 13 to ₁₅ into which the same material is charged, and 1 ₃ to 1 inventory of ₅ checks whether the 1st small automatic operation intermediate level smaller than the value obtained by subtracting the first offset value, if small if the raw material tank 1 No. in the raw material tank small automatic operation intermediate The driving motor 11 is controlled so that the raw material is charged up to a value obtained by adding the second offset value to the level.
Next, the stock amount of each raw material tank 1 ₃ to 1 _5, to determine whether there is a second small automatic operation intermediate level smaller than the value obtained by subtracting the first offset value, if less material tank If there is, the driving motor 11 is controlled so that the raw material tank is charged with the raw material up to a value obtained by adding the second offset value to the second smallest intermediate level of the automatic operation. Furthermore, the same operation is performed based on the largest automatic operation intermediate level,
Then by controlling the driving motor 11 so that charged raw materials to each raw material tank 1 ₃ to 1 ₅ to its upper limit level, and controls so as to suspend the material supply to the subsequent raw material supply source (not shown).
The charging operation is restarted by an instruction from an external operator.

 Next, the upper limit level and the lower limit level will be described.

The upper limit level, at the time of charging each raw material to each the raw material tank 1 ₁ to 1 _5, is the maximum amount allowed during a normal. The upper limit level is not always consistent with the practical volume of the raw material tank 1 ₁ to 1 ₅ from a source which is charged, particularly large material and density, such as for a fragile particulate material, practical May be significantly smaller than the required volume. On the other hand, the lower limit level is the minimum amount of the raw material that should be present in the raw material tank at normal times. If the raw material is cut out until the raw material tank is almost empty, the falling distance of the raw material at the time of charging the raw material becomes too large to cause an obstacle, and the raw material may not be cut out smoothly. Therefore, a lower limit level is determined.

 Next, the operation of this embodiment will be described.

As described above, the raw material A in the raw material tank 1 _1, the raw material tank 1 ₂ raw material B is in the raw material tank 1 ₃ to 1 ₅ material C is charged, respectively. Turning now the raw material C, the upper limit level is 100% with respect to practical volume of the raw material tank 1 ₃ to 1 _5, the lower limit level is also 40%. Hereinafter, inventory, etc. automatic operation intermediate level displays as a percentage of the practical volume of the raw material tank 1 ₃ to 1 _5. The automatic operation setting unit 2 calculates the upper limit level H and the lower limit level using the above-described formula, To 55%, 70%, 85% as the intermediate level for automatic operation
Is set, and the first and second offset values are each set to 5 from the outside.
% Is input, and these values are notified to the sequence control unit 6.

On the other hand, the stock amount calculation unit 5 notifies the material tank which is currently loaded with the raw material sent from the sequence control unit 6, the measurement value of the raw material input amount measurement unit 3, and the measurement of each raw material discharge amount. part 4 ₁ by the measurement of to 4 _5, each raw material tank 1 ₁ to 1 ₅
Is calculated in real time, and the sequence controller 6 is notified.

The control of the next step of the raw material tank 1 ₁ to 1 ₅ are not shown, at all times, the raw material is cut out and sends a raw material in the next step.

Here, when there is an operation of starting charging by the operator, the sequence control unit 6 starts the operation of charging the raw materials into the raw material tanks ₁₁ to ₁₅ . As described above, since the raw material charging process of the raw material tank of the present invention is applied for the raw material tank 1 ₃ to 1 ₅ in which the same raw material is charged, it will be mainly described raw material tank 1 ₃ to 1 ₅ . Raw material tank 1 ₁ , 1 ₂
With regard to the above, the sequence controller 6 is controlled so that the raw materials are charged by a known method.

First, among the automatic operation intermediate levels (55%, 70%, 85%) notified from the automatic operation setting unit 2 described above, the smallest automatic operation intermediate level (55%) has a first offset value. 50% and a value obtained by subtracting the (5%), than compared with the respective amount of stock material tank 1 ₃ to 1 _5, which is notified from the stock amount calculation unit, the stock amount is the value (50%) Find a lower raw material tank. If there is such a raw material tank,
For these raw material tanks, in order from the raw material tank with the smallest inventory, until the 60% which is the value obtained by adding the second offset value (5%) to the smallest automatic operation intermediate level (55%),
A raw material supply source (not shown) and a drive motor 11 are controlled so that the raw materials are charged. As a result, the raw materials are charged into the corresponding raw material tanks, and the stock of these raw material tanks becomes 60%.

Next, the same operation as described above is performed based on the second automatic operation intermediate level (70%). As a result, the stock amount was 65%
(= 70% -5%)
The stock of these raw material tanks is 75% (= 70% + 5%).

Further, the same operation as described above is performed based on the largest automatic driving intermediate level (85%). As a result,
90% (= 85% +) in the raw material tank below 80% (= 85% -5%)
Up to 5%).

Finally all the upper level of the raw material tank 1 ₃ to 1 _5, or 10
The sequence control unit 6 controls the raw material supply unit (not shown) and the driving motor 11 so that the raw materials are charged until it reaches 0%, and ends the single charging operation.

If the first and second offset values are not set, the following inconvenience occurs. For example, when a plurality of raw material tanks are sequentially charged with a raw material to a certain intermediate level during automatic operation, when the raw material is finally charged into the raw material tank into which the raw material is to be charged, the raw material is charged toward the beginning. The stock amount of the input raw material tank is naturally lower than the automatic operation intermediate level due to the cutout of the raw material. As a result, since the offset value is not determined, the operation of charging the raw materials to the same automatic operation intermediate level is repeated, and the charging operation at the next automatic operation intermediate level cannot be performed forever. is there. Further, even in the case where it is possible to shift to the next intermediate level of the automatic operation, the number of movements of the belt conveyor 8 with the traveling device is increased more than necessary, which may accelerate the deterioration of the equipment and cause a failure. In order to avoid such inconvenience, it is necessary to determine first and second offset values.

〔The invention's effect〕

As described above, according to the present invention, one or more automatic driving intermediate levels are set between the upper limit level and the lower limit level, and the first offset value is set from the lower automatic driving intermediate level to the automatic driving intermediate level. In the raw material tank with less inventory than the value obtained by subtracting the above, the raw material is charged until the value becomes the value obtained by adding the second offset value to the automatic operation intermediate level, so that the raw material tank can be moved from near the lower limit level to near the upper limit level at once. Since there is no charging of raw materials, there is no imbalance in the stock amount between the raw material tanks, no raw material tanks greatly lower than the lower limit level are generated, and no particle size unevenness occurs. There is an effect that a stable operation can be maintained in the charging of the raw material.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a raw material charging apparatus to which one embodiment of a raw material charging method according to the present invention is applied.
FIG. 1 is a block diagram showing a configuration of a raw material charging apparatus to which a conventional raw material charging method is applied. 1 ₁ to ₁₅ ... Material tank, 2 ... Automatic operation setting unit, 3 ... Material input amount measuring unit, 4 ₁ to 4 ₅ ... Material discharge amount measuring unit, 5 ... Stock amount calculating unit, 6 ... ... Sequence control unit, 7 ... Belt conveyor, 8 ... Belt conveyor with traveling device, 9 _{1 to} 9 ₅ ... Level switch for stock quantity correction, 10 ₁ to 10 ₅ ... Extremely full level switch, 11 ... Driving motor, 21 _{1 to} 21 ₅ … full capacity switch, 22 _{1 to} 22 ₅ … empty capacity switch, 23… sequence control unit.

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Hamaya 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References JP-A-61-23028 (JP, A) JP-A-58 -216837 (JP, A) JP-A-52-97556 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B65G 65/30-65/48

Claims (1)

(57) [Claims] 1. A method for charging a raw material into a plurality of raw material tanks for temporarily storing the raw material, wherein the raw material is charged into a plurality of raw material tanks. Setting one or more automatic operation intermediate levels between a certain lower limit level and an upper limit level that is the upper limit value of the amount, setting a first offset value and a second offset value, While measuring the amount of each stored raw material, the stored raw material is obtained by subtracting a first offset value from a value of the minimum automatic driving intermediate level among the one or more automatic driving intermediate levels. The raw material tank having a small amount of the raw material is obtained, and the raw material is sequentially fed from the raw material tank having the least amount of the raw material until the value becomes the value obtained by adding the second offset value to the value of the minimum automatic operation intermediate level. Charged, sequentially, next smallest automatic operation intermediate The above-mentioned operation is repeated based on the level, and when the above-mentioned operation based on the maximum automatic operation intermediate level is completed, the raw material tank is charged into each of the raw material tanks until the upper limit level is reached. How to charge raw materials