JP2011232049A - Raw material weighing control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a conventional problem in a raw material weighing control apparatus which is composed of: a weighing tank 1 having a weighing machine 2 such as a load cell for measuring weight of discharged raw material; a fixed-amount discharge device 3 such as a feeder for controlling a discharge rate of the raw material; and a controller 100 for giving commands to stop reception of the raw material and for operating the fixed-amount discharge device 3, to perform a series of operations from raw material reception to raw material discharge in one cycle; the problem being that a subsequent step must wait until completion of weighing when there is a request for raw material discharge to the subsequent step during reception of a raw material.SOLUTION: The controller 100 comprises a fixed-amount discharge control unit 102 for outputting an operation command and a raw material discharge rate command to the fixed-amount discharge device 3 and a raw material reception stop command unit 101 for outputting a raw material reception stop signal. The raw material reception stop command unit 101 comprises a weighing correction unit 103 for correcting a weight value with an integrated value of discharges and a weighing completion determination unit which, when a raw material weight value reaches the corrected weight value, determines the completion of weighing and outputs the raw material reception stop signal. Accordingly, weighing up to the weight value can be achieved even if the raw material is being discharged while the weighing tank 1 is receiving the raw material.

Description

  The present invention relates to a raw material weighing control apparatus.

  In a conventional raw material weighing control device, taking a weighing hopper in a converter as an example, two auxiliary raw material bunker, two feeders, a weighing hopper corresponding to the weighing tank referred to in the present invention, and two weighings. Machine, a charging gate, a charging gate opening / closing mechanism, a detection switch, and a controller. The controller weighs the fixed material in the weighing hopper with a weighing machine and passes it to the converter as a receiving container through the charging gate. There is a type in which the input control is performed and the opening / closing operation of the input gate is repeated from the time when the weighing value of the weighing machine reaches a predetermined value set in advance (for example, Patent Document 1).

JP-A-4-160509 (pages 8-12, FIG. 2)

However, in the conventional raw material weighing control device, when the timing of the raw material discharge request to the subsequent process is accepting the raw material, if the weighing and discharging are performed simultaneously, the weighing machine accepts only the necessary weight at that time. You will not be able to weigh it. For this reason, while receiving raw materials in the weighing tank, even if there is a request to discharge the raw materials to the subsequent process, the raw materials are not discharged until the raw materials are accepted and the weighing is completed, so there is a need to wait for the subsequent process. It was. For this reason, it became a factor which disturbs the cycle of a post process. Here, the post-process means receiving the raw material discharged from the weighing tank and transporting or processing the raw material. Therefore, the present invention starts discharging the raw material while receiving the raw material into the weighing tank. Even so, an object of the present invention is to provide a raw material weighing control apparatus that enables weighing and does not disturb the subsequent cycle of the weighing tank.

  In order to solve the above problem, the present invention is configured as follows.

  The invention according to claim 1 is a weighing tank, a weighing machine for measuring the weight of the raw material in the weighing tank, a quantitative discharge device for discharging the raw material at a commanded speed, and a raw material weighing value measured by the weighing machine. And a quantitative discharge control unit that outputs an operation command and a discharge speed command to the quantitative discharge device based on the raw material discharge request signal from the subsequent process, the raw material weighing value, the raw material discharge request signal, and the discharge speed command A raw material weighing control device including a controller having a raw material acceptance stop command unit that outputs a raw material acceptance stop signal based on the controller.

  According to a second aspect of the present invention, in the raw material weighing control device according to the first aspect, when the raw material discharge request signal requests the discharge of the raw material, the quantitative discharge control unit immediately receives the operation command in response to the operation command. It is characterized by driving.

  According to a third aspect of the present invention, there is provided the raw material weighing control apparatus according to the first aspect, wherein the raw material acceptance stop command unit is configured to calculate the discharge speed from the raw material weighing value when the raw material discharge request signal requests discharge of the raw material. A weighing target correction unit that subtracts a time integrated value of a command to calculate a corrected weighing value, and makes the corrected weighing value equal to the weighing value when the raw material discharge request signal does not require discharging of the raw material; and the raw material A weighing completion determination unit that outputs the raw material acceptance stop signal only when the weighing value is equal to or greater than the corrected weighing value.

  According to the present invention, it is possible to measure even if discharging is simultaneously performed while receiving the raw material, and the raw material can always be discharged from the weighing tank without restriction in accordance with the discharge start request from the subsequent process. A raw material weighing apparatus that does not disturb the cycle can be provided.

The block diagram which shows the structure of the raw material weight control apparatus of this invention Raw material weighing situation explanatory diagram of weighing tank Weighing value and raw material receiving and raw material discharging process status explanatory diagram of the weighing tank of the present invention

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

  FIG. 1 is a block diagram showing the configuration of a raw material weighing control apparatus showing an embodiment of the present invention. In the figure, the raw material weighing control device has a weighing tank 1, a weighing machine 2, a quantitative discharge device 3, and a controller 100. The controller 100 has a raw material acceptance stop command unit 101 and a quantitative discharge control unit 102. . Furthermore, the raw material acceptance stop command unit 101 includes a weighing target correction unit 103 and a weighing completion determination unit 104. The weighing tank 1 stores the received raw material and discharges it to a subsequent process. The post-process is a process for receiving the raw material discharged from the weighing tank 1 and transporting or processing the raw material. The raw material weighing apparatus according to the present invention depends on the form of the post-process and the processing content to be performed. It can be applied. The weighing machine 2 is a load cell or the like, and measures the weight of the raw material in the weighing tank 1. The fixed amount discharge device 3 discharges the raw material at a commanded speed. The controller 100 receives a raw material weighing value that is a weight measurement value of the raw material from the weighing machine 2 and a raw material discharge request signal from a subsequent process, and receives a raw material acceptance stop signal, a discharge speed command, and an operation command for the quantitative discharge device 3. Output. The raw material acceptance stop command unit 101 performs a correction operation of the weighing value, determines that the weighing is completed when the raw material weighing value is equal to or higher than the corrected weighing value, and generates a raw material acceptance stop signal. . Accepting a raw material having a weight specified by a weighing value in this way is called weighing. The weighing operation described above is performed by the weighing target correction unit 103 and the weighing completion determination unit 104, details of which will be described later. The fixed discharge control unit 102 generates an operation command based on a discharge speed command to the fixed discharge device 3 and a raw material discharge request signal input from a subsequent process.

The discharge speed command is determined by the request of the post-process for discharging the raw material. For example, if the subsequent process is a conveyor for transporting raw materials to a blast furnace, a discharge speed for setting the deposition thickness on the conveyor to a specified value is commanded. Assuming that the speed of the belt conveyor is V, the conveying width on the belt of the belt conveyor is L, the specified deposition thickness is Lt, and the bulk specific gravity of the raw material is w0, the discharge speed command Wv defined by the raw material discharge weight per unit time Is defined by equation (1).
Wv = L * V * Lt * w0 Formula (1)
The above is an example of how to calculate the discharge speed command Wv when the subsequent process is a belt conveyor, but is not limited thereto.

  Hereinafter, the operation of the raw material weighing control apparatus according to the present embodiment will be described separately for each case. FIG. 2 is an explanatory view of the raw material weighing state of the weighing tank 1. FIG. 4A shows the operation of accepting only the raw material, and FIG. 5B shows the operation of accepting and discharging the raw material at the same time. (C) shows the operation of discharging only the raw material.

  The raw material weighing control device according to the present invention includes a weighing tank 1 having a weighing machine 2 and a quantitative discharge device 3 that discharges the raw material at a speed in accordance with the speed command. By using the time integrated value, it is possible to achieve weighing according to the weighing value while simultaneously discharging the raw material without waiting for the subsequent process. That is, if a raw material discharge request signal is input from a subsequent process even while the raw material is being received, the quantitative discharge device 3 is operated to discharge the raw material, and the weighing target correction unit 103 causes the speed command time integrated value of the quantitative discharge device 6 to be discharged. The weighing value, which is the target acceptance value of the raw material, is corrected using the calculated value, the weighing completion determination unit 104 determines the completion of weighing using the corrected weighing value, and commands the acceptance stop. .

  FIG. 3 is a diagram for explaining the status of the weighing value, raw material receiving and raw material discharging process of the weighing tank of the present invention. The relationship between the weighing value Wh, the corrected weighing value Whh, the empty value Wl, the discharge start timing and the reception completion timing is shown.

(1) When a raw material discharge request signal is input from a subsequent process after completion of weighing, and there is a raw material discharge request, the raw material is received into the weighing tank 1 in the raw material receiving step shown in FIG. Here, the weighing target correction unit 103 does not correct the weighing value Wh. That is, the corrected weighed value Whh and the weighed value Wh are equal. The weighing completion determination unit 104 sets the weighing completion when the raw material weighing value input from the weighing machine 5 becomes equal to or higher than the corrected weighing value Whh, and outputs a raw material acceptance stop signal to a raw material supply device (not shown). Stop supplying. When a raw material discharge request signal is input from a subsequent process after completion of weighing, the quantitative discharge control unit 102 operates the quantitative discharge device 3 to discharge the weighed raw material to the empty value Wl. The total discharge weight W which is the weight of the weighed raw material discharged from the tank 1 is calculated by the equation (2).
W = Wh−Wl Formula (2)

(2) When a raw material discharge request signal is input from a subsequent process during raw material acceptance and there is a raw material discharge request When the raw material acceptance process and raw material discharge process shown in FIG. Since the weight of the raw material discharged by the apparatus 3 is less than the weight actually measured, if the weighing is continued with the raw material acceptance target value being the weighing value Wh, the weight of the discharged raw material is excessively weighed. . Here, when the discharge speed command for the quantitative discharge device 3 is Wv, the weighing correction unit 103 uses the simultaneous discharge weight Wvt when the raw material is received and discharged at the same time as the time integrated value of the discharge speed command as expressed by the equation (3). Calculate by
Wvt = Wv × tu Formula (3)
Here, tu is the time during which the raw material is received and discharged at the same time until the simultaneous discharge weight Wvt is calculated.
The weighing correction unit 103 corrects the weight value Wh in real time by the simultaneous discharge weight Wvt according to the equation (4), and calculates the corrected weighing value Whh.
Whh = Wh−Wvt Equation (4)

The weighing completion determination unit 104 sets the weighing completion when the raw material weighing value from the weighing machine 2 becomes equal to or greater than the corrected weighing value Whh, and outputs a raw material acceptance stop signal to the raw material supply device as in (1). Then, the supply of the raw material to the weighing tank 1 is stopped. After the weighing is completed, the quantitative discharge control unit 102 operates and discharges the quantitative discharge device 3 up to the empty value Wl. Upon completion of the discharge, the controller 100 determines the total discharged weight W which is the weight of the weighed raw material discharged from the weighing tank 1. Is calculated.
At this time, since the raw material is actually discharged by the amount corresponding to the simultaneous discharge weight Wvt, the weighing control calculation unit 101 calculates the total discharge amount W by Expression (5) by adding the simultaneous discharge weight Wvt.
W = Whh−Wl + Wvt Equation (5)
From Formula (4) and Formula (5), W = Wh-Wl Formula (2)
Thus, even when the raw material acceptance and the raw material discharge are performed at the same time, the raw material can be accepted and discharged by the same total discharge weight W as in the case of (1).
As described above, it is possible to perform the weighing control for simultaneously discharging the raw materials without waiting for the subsequent process.

  As can be seen from FIG. 3, even if a raw material discharge is requested during the raw material reception, the raw material is discharged immediately, and there is no waiting time for the post-process until the weighing is completed, and the time from the start of the discharge to the completion of the reception. Can be shortened.

DESCRIPTION OF SYMBOLS 1 Weighing tank 2 Weighing machine 3 Constant discharge apparatus 100 Controller 101 Raw material reception stop command part 102 Fixed discharge control part 103 Weighing target correction | amendment part 104 Weighing completion determination part

Claims (3)

A weighing tank;
A weighing machine for measuring the weight of the raw material in the weighing tank;
A quantitative discharge device that discharges raw materials at a commanded rate;
A quantitative discharge control unit that outputs an operation command and a raw material discharge speed command to the quantitative discharge device based on a raw material weighing value measured by the weighing machine and a raw material discharge request signal from a subsequent process;
A raw material acceptance stop command unit that outputs a raw material acceptance stop signal based on the raw material weighing value, the raw material discharge request signal, and the raw material discharge speed command;
A raw material weighing control device comprising:   2. The raw material weighing control device according to claim 1, wherein when the raw material discharge request signal requests the discharge of the raw material, the quantitative discharge control unit immediately operates the quantitative discharge device according to the operation command. The raw material acceptance stop command unit calculates a corrected weighing value by subtracting a time integrated value of the discharge speed command from the raw material weighing value when the raw material discharge request signal requests discharging of the raw material, and the raw material discharging request A weighing target correction unit for making the corrected weighing value equal to the weighing value when the signal does not require discharge of the raw material;
2. The raw material weighing control apparatus according to claim 1, further comprising a weighing completion determination unit that outputs the raw material acceptance stop signal only when the raw material weighing value is equal to or more than the corrected weighing value.

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