JP2000281211A - Storage equipment having carrying control function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide storage equipment having a storage quantity control function to control a storage quantity of a storage vessel containing a long belt conveyer and a distribution shooter. SOLUTION: Stored goods carried out by a carry-out device 20 are carried to a distribution shooter 23 by a common belt conveyer(BC), then branched into a #1BF system and a #2BF system. In addition, the stored goods are carried to a #1BF system hopper 25 by a #1BF system BC 24 and to a #1BF system hopper 27 by a #2BF system BC 26. In this case, this equipment is controlled by a sum system controller for operating the device 20 to control in a predetermined value a total storage quantity of the stored goods stored in the hoppers 25 and 27 and by a difference system controller for operating the shooter 23 to control in a predetermined value a different storage quantity of the stored goods stored in the hoppers 25 and 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage facility having a transport control function, and more particularly to a storage facility having a transport control function for raw materials stored in a hopper into which raw materials are fed by a long belt conveyor and a distribution chute. .

[0002]

2. Description of the Related Art A belt conveyor is used as a transport means for transporting raw materials received in an upper process to a lower process. For example, a belt conveyor is also used when transferring coal to a receiving hopper provided for a plurality of blast furnaces from a coal blending tank that stores coal in which a predetermined brand is mixed at a predetermined ratio in a steel mill. I have.

FIG. 1 is a conceptual view of a coal storage facility of a steel mill. Coal stored in a coal blending tank 11 is carried out by a first belt conveyor 12 and distributed by a distribution shooter 13.
Are distributed in two directions. The coal distributed to the two passes through the second belt conveyor 14, through the # 1 blast furnace receiving hopper 15 and through the third belt conveyor 16, into # 2.
It is conveyed to the receiving hopper 17 for blast furnaces.

In order to stably supply coal to two blast furnaces in this coal storage facility, it is necessary to maintain the coal storage amount of two receiving hoppers 15 and 17 within a certain range. Measure the storage of 17
The distribution ratio is changed so that the amount of coal supplied to the hopper whose storage amount is reduced by the distribution shooter 13 is increased, and when the storage amount of the two receiving hoppers 15 and 17 is larger than the upper limit, the distribution from the coal blending tank 11 is performed. The sequence control of stopping the cutting of coal and restarting the cutting of coal when it becomes lower than the lower limit was applied.

[0005]

However, when the coal blending tank 11 and the two receiving hoppers 15 and 17 are arranged apart from each other, the first, second, and third belt conveyors become longer and the belt conveyors become longer. Even if the amount of coal mounted on the hopper increases and the cutting of coal from the coal blending tank 11 is stopped, the supply of coal to the hopper is continued if the belt conveyor is operating, so the hopper storage amount May rise above the upper limit.

It is conceivable to stop the operation of the belt conveyor and stop the supply of coal when the hopper storage amount rises above the upper limit. However, when the operation of the belt conveyor is resumed, the operation is started with the coal loaded. Because of the necessity, the output of the motor for driving the belt conveyor must be increased, which may increase the equipment cost. Even if the storage value of the hopper drops below the lower limit and the cutting of coal from the coal blending tank 11 is restarted, the coal is not immediately supplied to the hopper, so that the hopper storage amount may be abnormally reduced. .

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a storage facility having a transport control function for controlling a storage amount of a storage tank having a long belt conveyor and a distribution chute.

[0008]

According to a first aspect of the present invention, there is provided a storage facility having a transport control function, comprising: a cutting unit for cutting out an object to be stored from a blending tank; and a common belt for conveying the object to be cut out by the cutting unit. The conveyer and the articles transported by the common belt conveyor are distributed at a controllable distribution ratio of 2
A distribution chute that branches, a first belt conveyor that conveys one of the storage objects branched by the distribution chute, a first storage tank that stores the storage object conveyed by the first belt conveyor, A second belt conveyor that conveys the other storage object branched into two by the distribution shooter;
The second storage tank for storing the articles transported by the second belt conveyor, and the total storage amount of the articles stored in the first storage tank and the second storage tank is a preset total. Sum control means for operating the cutout means to control the storage amount and adjusting the amount of stored material cut out from the blending tank,
The distribution chute is operated to control the difference storage amount between the objects stored in the first storage tank and the second storage tank to a predetermined difference storage amount, and the first belt conveyor and the second belt storage are operated. And a difference system control means for adjusting a distribution ratio of the articles to be supplied to the belt conveyor.

In the present invention, the total storage amount is controlled by the sum control means, and the distribution ratio to the first and second storage tanks is controlled by the difference control means. In the storage facility having the transport control function according to the second invention, the sum system control unit and the difference system control unit are each a proportional integral control unit. In the present invention, the total deviation and the distribution ratio are proportionally and integrated controlled to eliminate the steady-state deviation.

According to a third aspect of the present invention, there is provided a storage facility having a transport control function, comprising: first discharge amount detecting means for detecting a discharge amount of an article to be stored from a first storage tank; Second unloading amount detecting means for detecting the unloading amount of the storage object, wherein the sum control unit detects the output by the first unloading amount detecting means and the second unloading amount detecting means. Adding means for adding the output amount of the stored material and the output of the sum control means.

In the present invention, the carry-out amount of the storage object from the storage tank is applied to the forward control system.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a schematic view of a storage facility having a transport control function according to the present invention, and shows a coal quantity Q _c (t).
Is cut out by the cutting device 20, and the coal blending tank 2
1 to the common belt conveyor 22. A distribution shooter 23 is installed at the end of the common belt conveyor 22, and the amount of coal Q _e (t) reaching the distribution shooter 23.
Indicates that the time for coal transportation by the common belt conveyor 22 is T
_If it is set to ₀ , it can be expressed by [Equation 1].

[0013]

(Equation 1)

The amount of coal Q that has reached the distribution shooter 23
Assuming that the ratio between _e (t) and the amount of coal Q ₁ (t) supplied to the # 1 blast furnace belt conveyor is Α, Equation 2 holds.

[0015]

(Equation 2)

Accordingly, the amount of coal Q ₁ (t) supplied to the # 1 blast furnace belt conveyor is represented by [Equation 3].

[0017]

(Equation 3)

From the distribution shooter 23 to the # 1 blast furnace hopper 2
Assuming that the transfer time by the # 1 blast furnace belt conveyor 24 up to 5 is T ₁ , the amount of coal Q _1i (t) supplied to the # 1 blast furnace hopper 25 is represented by [ _Equation 4].

[0019]

(Equation 4)

From the distribution shooter 23 to the # 2 blast furnace hopper 2
Assuming that the transfer time by the # 2 blast furnace belt conveyor 26 up to 7 is T ₂ , the amount of coal Q _2i (t) supplied to the # 2 blast furnace hopper 27 is represented by [ _Equation 5].

[0021]

(Equation 5)

_Assuming that the amount of coal taken out from the # 1 blast furnace hopper 25 and used is Q _1u (t), the amount M ₁ of coal stored in the # 1 blast furnace hopper 25 is represented by [Equation 6]. You.

[0023]

(Equation 6)

Further, _assuming that the amount of coal taken out from the # 2 blast furnace hopper 27 and used is Q _2u (t), the amount of coal M ₂ stored in the # 2 blast furnace hopper is expressed by [Equation 7]. Is done.

[0025]

(Equation 7)

FIG. 3 is a transfer function diagram of a coal storage facility obtained by Laplace transform of [Equation 1] to [Equation 7].
Here, the coal amount M ₁ stored in the # 1 blast furnace hopper 25 and the coal amount M stored in the # 2 blast furnace hopper 27
Sum M _a and difference M _d between ₂ are represented respectively [Equation 8] and [equation 9].

[0027]

(Equation 8)

[0028]

(Equation 9)

Therefore, when [Equation 6] and [Equation 7] are substituted into [Equation 8] and [Equation 9], [Equation 10] and [Equation 1]
1] is obtained.

[0030]

(Equation 10)

[0031]

[Equation 11]

The sum M _a and difference M _d of the amount of coal accumulated in the hopper, coal stored in the coal amount M ₁ and # 2 blast furnace system hopper 27 stored in the # 1 blast system hopper 25 weight since a primary function of M _2, coal amount M ₁ and M ₂ the sum M _a and difference M _d coal amount accumulated in each hopper is controlled to a constant it can also be controlled to be constant. Further, [Equation 1] to [Equation 5] are substituted for [Equation 10] and [Equation 11], and the transfer time T ₁ by the # 1 blast furnace belt conveyor 24 and the transfer time T by the # 2 blast furnace belt conveyor 26 are further substituted. _{If 2} is equal to T, then [Equation 12] and [Equation 13] are obtained.

[0033]

(Equation 12)

[0034]

(Equation 13)

Here, when [Equation 13] is linearized by focusing on the deviation from the equilibrium state, [Equation 14] is obtained. Note that in each state quantity, a lower case letter indicates a deviation amount from the equilibrium state.

[0036]

[Equation 14]

[0037]

(Equation 15)

In equation (15), the deviation q of the amount of coal carried out of the common belt conveyor 22 from the equilibrium state is shown.
₀ is ignored because it is small. Figure 4 is a transfer function diagram of the deviation system represented by [Equation 14] and [equation 15], the deviation α of the coal feed amount deviation q _c and distribution ratio of the distribution chute of the common belt conveyor 22 and manipulated variable, a control system to control the amount of the deviation m _a and m _d of the sum and difference of the amount of coal accumulated in the hopper proves to be simple integration system with dead time. FIG. 5 is a transfer function diagram for converting the coal transport equipment into a deviation system.

Therefore, a deviation system composed of a sum system and a difference system can be controlled by a simple proportional controller in principle, but a proportional-integral controller is used to eliminate a steady-state deviation. Figure 6 is a transfer function diagram of the control system, sum system, remove the amount of coal to be used is taken out from the # 1 blast furnace system hopper 25 in order to accelerate a response from Q _1u and # 2 blast furnace system hopper 27 And an adder for adding the amount of used coal to the output of the proportional-plus-integral controller as Q _2u as a feedforward signal.

In the difference system, in order to make the output of the difference system proportional integral controller dimensionless, the output of the difference system proportional component controller is replaced by the sum system proportional integral controller Q ₀ = Q _C. (T-T
₀ ). FIG. 7 is a transfer function diagram for a simulation test for verifying the effect of the present invention, and includes a coal transfer facility system 71 of FIG. 3, a hopper storage amount control system 72, an actuator system 73, and a disturbance shown in FIGS. System 7
4 is included.

The coal transfer facility system 71 includes a first waste time element 711 simulating a coal transfer time T ₀ by the common belt conveyor 22, and a coal quantity Q distributed to the # 1 blast furnace belt conveyor 24 by the distribution shooter 23. A multiplication element 712 for calculating ₁ and a _first for calculating the amount of coal Q ₂ distributed to the # 2 blast furnace belt conveyor 26 by the distribution shooter 23.
Addition / subtraction element 713, second waste time element 7 simulating coal transfer time T by # 1 blast furnace belt conveyor 24
14, a third waste time element 715 that simulates the coal transfer time T by the # 2 blast furnace belt conveyor 26, and the amount of coal Q _1i supplied to the # 1 blast furnace hopper 25 by the # 1 blast furnace belt conveyor 24 from # The second addition / subtraction element 716 for subtracting the used coal amount Q _1u of the first blast furnace hopper 25, the # 2 blast furnace hopper 27 from the coal amount Q _2i supplied to the # 2 blast furnace hopper 27 by the # 2 blast furnace belt conveyor 26. The difference between the amount of coal supplied to the # 1 blast furnace system hopper 25 and the amount of use calculated by the third addition / subtraction element 717 and the second addition / subtraction element 716 for subtracting the amount of used coal Q _2u is used to integrate the # 1 blast furnace. Integration element 71 for calculating coal storage amount M ₁ of system hopper 25
8 and # 2 calculated by the third addition / subtraction element 717
It comprises a second integral element 719 to calculate the coal storage amount M ₂ of the difference between the coal supply amount and the amount of the blast furnace system hopper 27 integral to # 2 blast furnace system hopper 27.

The hopper storage amount control system 72, a fourth subtraction element for calculating a total storage amount M _a coal storage amount M ₂ of coal stocks M ₁ and # 2 blast furnace system hopper 27 of # 1 blast system hopper 25 721, # 1 coal storage amount M ₁ of a blast furnace system hopper and # 2
Fifth subtraction element 722 which calculates a difference storage amount M _d of coal storage amount M ₂ of a blast furnace system hopper 27, sixth subtracting the actual total storage amount M _a from the target value M _a0 total storage amount of the hopper An addition / subtraction element 723, a seventh addition / subtraction element 72 for subtracting the actual difference storage amount M _d from the target value M _d0 of the hopper difference storage amount.
4, seventh subtraction element for calculating the sum system controller 725, difference system controller 726, a coal amount Q _C to be supplied to the common belt conveyor 22 by adding the feedforward signal to output a sum based controller 725 727 A fourth waste time element 728 that simulates the coal transport time by the common belt conveyor 22,
And a division element 729 to make the difference system controller 726 dimensionless.

The actuator system 73 includes a cutout unit 731 for cutting out coal, and a distribution shooter 23 for changing a coal distribution ratio. Further, the disturbance system 74 includes a first detection element 741 for detecting the amount of coal usage Q _1u from the # 1 blast furnace hopper 25 and a second detection element for detecting the amount of coal usage Q _2u from the # 2 blast furnace hopper 27. Includes a detection element 742.

FIG. 8 shows a simulation result (No. 1). The amount of coal Q _1u discharged from the # 1 blast furnace hopper is reduced by 10% in 50 minutes, and the storage amount of the # 2 blast furnace hopper is further reduced in 170 minutes. Shows a case where is increased by 5 tons. FIG. 9 shows a simulation result (No. 2). In 50 minutes, the amount of coal Q _1u discharged from the # 1 blast furnace hopper was reduced by 50%.
Further, a case where the storage amount of the # 2 blast furnace hopper is increased by 5 tons in 170 minutes is shown.

As can be seen from these results, even when the amount of coal used from the hopper is reduced by half, the amount of coal stored in each hopper varies only by ± 5 tons, and the above-described control is applied to the actual coal transport system. It is possible that the method can be applied.

[0046]

According to the storage device having the transport control function according to the first aspect of the present invention, even if a long belt conveyor and a distribution chute are used to supply the objects to be stored, the belt conveyor is stored in the storage tank without stopping. It is possible to accurately control the storage amount of the storage object to be stored.

According to the storage device having the transport control function according to the second invention, it is possible to accurately maintain the storage amount of the storage target stored in the storage tank within a predetermined range. According to the storage device having the transport control function according to the third aspect of the invention, by additionally providing the forward control, it is possible to shorten the response time even when the usage amount from the storage tank changes greatly.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a coal storage facility of a steelworks.

FIG. 2 is a schematic diagram of a storage facility having a storage amount control function according to the present invention.

FIG. 3 is a transfer function diagram of a coal storage facility.

FIG. 4 is a transfer function diagram of a deviation system.

FIG. 5 is a transfer function diagram for converting to a deviation system.

FIG. 6 is a transfer function diagram of a control system.

FIG. 7 is a transfer function diagram for a simulation test.

FIG. 8 is a simulation result (1).

FIG. 9 is a simulation result (2).

[Explanation of symbols]

 Reference Signs List 20 cutting-out device 21 coal blending tank 22 common belt conveyor 23 distribution shooter 24 # 1BF belt conveyor 25 ... # 1BF system hopper 26 ... # 2BF system belt conveyor 27 ... # 2BF system hopper

Claims (3)

[Claims] 1. A cutting means for cutting out an article to be stored from a mixing tank, a common belt conveyor for conveying the article to be cut out by the cutting means, and an article to be transported by the common belt conveyor can be controlled. A distribution shooter that bifurcates at a distribution ratio, a first belt conveyor that conveys one of the storage objects bifurcated by the distribution chute, and a second belt conveyor that stores the storage object conveyed by the first belt conveyor. 1 storage tank; a second belt conveyor that conveys the other storage object branched into two by the distribution shooter; and a second storage tank that stores the storage object conveyed by the second belt conveyor. Operating the cut-out means to control the total storage amount of the objects to be stored stored in the first storage tank and the second storage tank to a preset total storage amount. Sum control means for adjusting the amount of the storage target cut out from the mixing tank; and the difference storage amount between the storage targets stored in the first storage tank and the second storage tank to a preset difference storage amount. Operating the distribution shooter to control the distribution ratio of the articles to be supplied to the first belt conveyor and the second belt conveyor, and a difference system control means comprising: Having storage equipment. 2. The storage facility having a transport control function according to claim 1, wherein said sum system control unit and said difference system control unit are each a proportional integral control unit. 3. A first unloading amount detecting means for detecting an unloading amount of the storage object from the first storage tank, and a second unloading amount detecting means for detecting an unloading amount of the storage object from the second storage tank. And the unloading amount detecting means, wherein the sum system control means has an output of the storage object detected by the first unloading amount detecting means and the second unloading amount detecting means. The storage facility having a transport control function according to claim 1 or 2, further comprising an adding means for adding an output of the sum control means.