JP3093107B2 - Metering method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metering / blending method.

[0002]

2. Description of the Related Art When a plurality of raw materials are mixed at a prescribed ratio, the supply amount is controlled by a supply amount control method or a discharge amount control method.

[0003] The supply amount control method is implemented as shown in FIG. Here, the raw material A and the raw material B are mixed at a specified ratio “A:
When B = a: b ″ is blended to obtain a blended raw material having a total amount of C, the hopper 1a is charged with the raw material A. The hopper 1b is charged with the raw material B.

[0004] While weighing the mixing container 2 with the platform scale 3c, the motor 4a is operated to operate the feeder 5a for cutting out the raw material A from the hopper 1a. The feeder 5a is operated until the net weight of the platform scale 3c becomes “C · (a / a + b)”.

Next, the feeder 5b for cutting out the raw material B from the hopper 1b is operated by operating the motor 4b while weighing the mixing container 2 with the platform scale 3c. The feeder 5b operates until the net weight of the platform scale 3c becomes "C".

Alternatively, assuming that the actual dispensed amount of the raw material A is Wa, the required amount of the raw material B is “b · Wa / a = Wb”, so that the net weight of the platform scale 3c is “Wa + Wb”.
The feeder 5b is operated until "".

[0007] The discharge control method is implemented as shown in FIG. The hopper 1a and the feeder 5a are supported by a platform scale 3a. The hopper 1b and the feeder 5b are supported by a platform scale 3b.

The feeders 5a and 5b are operated simultaneously.
Assuming that the initial weight values of the platform scales 3a and 3b are wa and wb, respectively, the control unit 6a operates the feeder 5a until the weight value of the platform scale 3a becomes “wa−C · (a / a + b)”.

The control unit 6b operates the feeder 5b until the weight value of the platform scale 3b becomes "wb-C. (B / a + b)".

[0010]

In the supply amount control method,
Although it can be accurately compounded, each of the raw materials A and B has a scale 3
Since the measurement is performed sequentially at c, there is a problem that it takes too much time.

In the discharge control method, since the raw materials A and B can be simultaneously charged into the mixing container 2, a short processing time is required, but the weight of each discharge mechanism (feeders 5a and 5b) is measured by the platform scales 3a and 3b. Since the end timing of dispensing is controlled by measuring, there is a problem that accurate measurement and blending cannot be performed due to factors such as vibration of the discharge mechanism.

As described above, conventionally, one of the accuracy and the processing time has to be sacrificed. In the conventional metering / mixing, when the accurate metering / mixing is required, the supply amount control method is adopted, and When an appropriate treatment is required, an emission control method is adopted.

[0013] It is an object of the present invention to provide a metering and blending method capable of obtaining a quick and accurate blending result.

[0014]

According to the method of the present invention, when a plurality of raw materials are measured and blended, a plurality of raw materials are simultaneously supplied to a blending container by separate feeders, and the dispensing of the feeder is stopped. The total weight of the raw materials charged into the mixing container is measured, and the required remaining amount for each raw material is calculated from the difference between the total weight of the raw materials charged into the mixing container and the target weight, and the required remaining amount for each raw material is calculated. The amount is sequentially delivered to the compounding container.

[0015]

According to this configuration, a plurality of raw materials are simultaneously charged into the mixing container until immediately before the target total amount of the mixing raw material is filled in the mixing container, and thereafter, the required remaining amount of each raw material is sequentially dispensed and the target total amount is reduced. Approach.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the weighing and blending method of the present invention will be described with reference to specific embodiments shown in FIGS. The same components as those shown in FIGS. 3 and 4 showing the conventional example are denoted by the same reference numerals.

As shown in FIG. 2, a hopper 1a and a feeder 5a for cutting out the raw material A from the hopper 1a are supported by a platform scale 3a. The hopper 1b and the feeder 5b for cutting out the raw material B from the hopper 1b
b. Mixing container 2 arranged at a position to receive the raw materials paid out from feeders 5a and 5b
Is supported by the platform scale 3c.

The main controller 6c controls the operation of the feeder 5a via the controller 6a based on the weight value of the platform scale 3c.
Also, the operation of the feeder 5b is controlled via the control unit 6b. The main control unit 6c includes a compounding ratio of the raw material A and the raw material B “
A: B = a: b "and the total amount C are set, and the main control unit 6c instructs the control units 6a and 6b on the payout amount of the large supply.

The control section 6a is instructed as "C. (a / a + b) .K = wa", and the control section 6b is instructed as "C. (b / a + b) .K = wb". Here, K is a coefficient less than “1”.

The control units 6a and 6b simultaneously instruct the feeders 5a and 5b (first and second feeders) to start operation at # 1 shown in FIG. 1 to start large supply. Feeders 5a, 5b
Assuming that the weighing values of the platform scales 3a and 3b immediately before the start of the operation are Wa and Wb, respectively, in # 2, the control unit 6a
The motor 4a is temporarily stopped upon detecting that the weighed value of "a" has become "Wa-wa".
The controller 6b detects that the weight value of the platform scale 3b has become "Wb-wb", and temporarily stops the motor 4b.

In step # 3, the main control section 6c reads the weight value Wc of the platform scale 3c at this time, and obtains (C-Wc) (a / a + b) = w.
a '(C-Wc) (b / a + b) = w
From the calculation of b ', the necessary remaining amounts wa' and wb 'of the raw materials A and B are calculated.

In step # 4, the main control unit 6c instructs the control unit 6a to supply a small amount while repeatedly reading the weighed value of the platform scale 3c to perform static weighing, and the necessary remaining amount wa 'is added to the mixing container 2. That is, it instructs the control unit 6a to stop the feeder 5a. At this time, the feeder 6b is stopped.

In step # 5, the main control unit 6c instructs the control unit 6b to supply a small amount while repeatedly reading the weighed value of the platform scale 3c to perform static weighing, and the necessary remaining amount wb 'is added to the mixing container 2. And instructs the control unit 6b to stop the feeder 5b. At this time, the feeder 5a is stopped.

In this way, a compounding raw material having a compounding ratio “A: B = a: b” and a total amount C is obtained in the compounding container 2. In the above-described blending operation, the feeders 5a and 5b simultaneously supply large amounts to the blending container 2 by the discharge amount control method based on the weighed values of the platform scales 3a and 3b. When the amount of the raw material charged into the weighing machine is before the quantification, the required remaining amount of each raw material is sequentially and precisely supplied to the mixing container 2 by a small supply based on the weighing value of the platform scale 3c. Accurate compounding measurement can be realized.

In the above embodiment, two types of raw materials were weighed and blended. However, the same applies to the case of three or more types of weighed blends. Before the quantification, the necessary remaining amount of each raw material is precisely paid out to the compounding container 2 sequentially with a small supply.

[0026]

As described above, according to the present invention, when a plurality of raw materials are weighed and blended, a plurality of raw materials are simultaneously supplied to the blending container by separate feeders, and the delivery of the feeder is stopped. Weigh the total weight of the raw materials that have been charged into the blending container, calculate the required remaining amount for each raw material from the difference between the total weight of the raw materials and the target weight that is charged into the mixing container,
In order to sequentially pay out the required remaining amount for each raw material to the blending container, a plurality of raw materials are simultaneously charged into the blending container until just before the target total amount of the raw material is filled in the blending container. By dispensing the amounts sequentially, a quick and accurate blending result can be obtained.

[Brief description of the drawings]

FIG. 1 is a flowchart of the metering / blending method of the present invention.

FIG. 2 is a configuration diagram of a specific example of the metering / blending method of the present invention.

FIG. 3 is an explanatory diagram of a conventional supply amount control method.

FIG. 4 is an explanatory diagram of a conventional emission control method.

[Explanation of symbols]

 1a, 1b Hopper 2 Compounding container 3a, 3b, 3c Scale 5a, 5b Feeder 6a, 6b Control unit 6c Main control unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-274438 (JP, A) JP-A-63-274439 (JP, A) JP-A-58-214817 (JP, A) 49734 (JP, U) JP 5-35812 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01G 19/32 G01G 19/34 G01G 19/38 G05D 11/04

Claims (2)

(57) [Claims] 1. When a plurality of raw materials are weighed and blended, a plurality of raw materials are simultaneously supplied to a blending container by separate feeders, and the delivery of the feeder is stopped, and the total weight of the raw materials charged into the blending container is reduced. Weighing, calculating the required remaining amount for each raw material from the difference between the total weight of the raw materials and the target weight that is charged into the mixing container, and sequentially paying out the required remaining amount for each raw material to the mixing container. . 2. When a plurality of raw materials are weighed and blended, the plurality of raw materials are simultaneously supplied to the blending container by separate feeders in a discharge amount control system, and the delivery of the feeder is stopped. Weigh the total weight of the raw materials, calculate the required remaining amount for each raw material from the difference between the total weight of the raw materials charged into the blending container and the target weight, and measure the required residual amount for each raw material while weighing the blending container. A metering and blending method in which the amount is sequentially dispensed to the blending container by a supply amount control method.