JP2000070696A - Method for charging material in mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the discharge completion periods of respective materials to almost coincide with each other while discharging the materials in the same ratio when the materials are discharged from a weighing tank to a mixer. SOLUTION: When various weighed materials are charged in a mixer 16 through a premix chute 14, the discharge completion times to the set weighed values of the materials in respective weighing tanks 7, 9, 8 are operated and the weighing tank becoming the max. discharge completion time is set to a specific weighing tank. A material discharge gate is fully opened in the specific weighing tank to discharge a material and the opening degrees of the material discharge gates of the weighing tanks other than the specific weighing tank are simultaneously adjusted so as to coincide with the discharge completion period of the material in the specific weighing tank to discharge materials and the discharge of the respective materials is completed at an almost same period while the respective materials of the weighing tanks are discharged in the ratio corresponding to the set weighed values.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of introducing various materials into a lower mixer while premixing the materials in a premix chute, and more particularly, to adjusting the degree of opening of a material discharge gate of each measuring tank to adjust each material. To a mixer in which the completion of the release of the gas is substantially coincident.

[0002]

2. Description of the Related Art For example, in a ready-mixed concrete production plant, gravel, sand cement, water and an admixture, which are concrete materials, are temporarily stored in a material storage tank disposed at the top of the plant, and distributed to lower levels based on a shipping request. Predetermined amounts of various materials are weighed in each measuring tank installed, and after weighing, the material discharge gates at the bottom of each measuring tank are sequentially opened, and various materials are charged into the lower mixer, and kneaded for a predetermined time to produce ready-mixed concrete. are doing. At this time, when charging the materials into the mixer, a premix chute is used to preliminarily mix the respective materials, the materials are released at the same time to reduce the time for charging the materials, and the premix chute is used in the premix chute. There has been proposed a ready-mixed concrete production plant which aims to increase the production capacity by shortening the total time of material input and kneading time without increasing the kneading time in the mixer by premixing (temporary mixing).

[0003]

However, even when various materials are released at the same time using a premix chute, the release completion timing is often not constant because the amounts of the respective materials are different from each other. Therefore, in order to perform more uniform premixing, it is desired that the release completion timings be substantially the same while the materials are released at the same ratio.

In view of the above, the present invention provides a method for charging a material into a mixer in which the materials are discharged from the measuring tank to the mixer at the same ratio while the respective materials are discharged at the same ratio. The task is to

[0005]

In order to solve the above-mentioned problems, the present invention relates to a method for charging a material into a mixer according to the first aspect of the present invention. Calculate the discharge completion time corresponding to the set measurement value of each material in each measurement tank when charging the lower mixer while pre-mixing in pre-mixing, and specify the measurement tank with the maximum discharge completion time among them. At the start of material release, the material release gate is fully opened in the specific measurement tank, and in the measurement tanks other than the specific measurement tank, the release time of the material is approximately the same as the release time of the material in the specific measurement tank. The material is discharged by adjusting the opening of the material discharge gate.

According to a second aspect of the present invention, in the method of charging a material into a mixer, the material discharging speed of each measuring tank is calculated at the time of discharging the material. The material discharge speed is changed by changing the opening degree of the material discharge gate of the measuring tank other than the specific measuring tank in response.

According to a third aspect of the present invention, in the method of charging a material into a mixer, the opening of the material discharge gate is adjusted by:
Before the fuzzy inference rule, the ratio of the set weighing value to the maximum weighing value in each weighing tank, and the ratio of the release completion time of the specific weighing tank and the release completion time when the material discharge gate is fully opened to the set weighing value of each weighing tank are described. The opening of the material discharge gate of each measuring tank with respect to the discharge completion time of the specific measuring tank is defined as the consequent part. It is characterized in that the degree of opening of the material discharge gate of the measuring tank is determined.

According to a fourth aspect of the present invention, in the method of charging a material into a mixer, the material discharge speed is adjusted by calculating a difference value of a discharge speed with respect to a discharge average speed when a material discharge gate is fully opened in a specific measuring tank. In addition to the antecedent part of the fuzzy inference rules, the amount of opening correction of the material discharge gate to obtain the appropriate release speed of the measuring tanks other than the specific measuring tank is defined as the consequent part. The speed is calculated at predetermined time intervals, and fuzzy inference is performed each time based on the degree of change of the release speed in the specific measuring tank, and an appropriate material discharge gate opening correction amount in the measuring tank other than the specific measuring tank is determined. In this case, the material discharge speed of each measuring tank is adjusted.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the method for charging materials into a mixer according to claim 1 of the present invention, taking a ready-mixed concrete production plant as an example, gravel, sand, cement, water and an admixture are measured. When put into a mixer, water and admixture are put directly into the mixer, and gravel, sand and cement are first discharged into a premix chute for premixing before being put into the mixer. At this time, the release of each material is started almost at the same time, and the release speed is adjusted so that the release is completed at about the same time.

In the method, first, a discharge completion time when each material discharge gate is fully opened is calculated with respect to a set measurement value of gravel, sand, and cement. Then, among the measuring tanks of these materials, the measuring tank in which the release time is the maximum is specified, and the specified measuring tank is used. For example, a gravel weighing tank could
Assuming that it takes seconds and takes the longest time, the gravel measuring tank is set as the specific measuring tank. In the specific measuring tank, the opening of the material discharge gate is set to fully open, and at the same time, for the other measuring tanks, the material is released so that the discharge completion timing when the specific measuring tank discharges with the material discharging gate fully open is released. Set the gate opening. When the opening degree of the material discharge gate of each measuring tank is set, the material discharging gate of each measuring tank is opened almost at the same time to start discharging the material. Then, each material can be released almost at the same time, and each material is released at almost the same ratio, so that uniform premixing of each material can be performed.

According to a second aspect of the present invention, in the method of charging a material into a mixer, the material discharge speed is calculated at predetermined time intervals simultaneously with the release of each material, and a change occurs in the material discharge speed of the specific measuring tank. The release speed of the material is also changed in each of the measuring tanks other than the specific measuring tank in accordance with the degree of the change and the degree of the change, so that the discharge completion is completed at the same time, and the respective materials are uniformly premixed.

According to a third aspect of the present invention, there is provided a method for charging a material into a mixer, wherein a set weighing value in each weighing tank, a weighing speed when the material discharge gate is fully opened, a maximum discharge time, and a specific weighing tank are specified. In addition, the fuzzy inference rules are based on the ratio of the set weighing value to the maximum weighing value in the weighing tanks other than the specific weighing tank, and the ratio of the release completion time of the specific weighing tank and the release completion time when the material discharge gate is fully opened to the set weighing value The appropriate opening of the material discharge gate of each measuring tank is determined in accordance with the above formula, and the material discharging gate of each measuring tank is adjusted by adjusting the material discharging gate to the appropriate opening. As a result, each material can be released at substantially the same ratio, and the release can be completed at the same time, so that uniform premixing can be performed.

According to a fourth aspect of the present invention, in the method of charging a material into a mixer, the release speed of each material discharged from each measuring tank at the same time as the discharge of the material is calculated at predetermined time intervals. Calculate the degree of change of the material discharge rate with respect to the material discharge rate when the material discharge gate is fully opened for the specific measuring tank, and from the degree of change of the material discharge rate, use the fuzzy inference rules to determine the appropriate The opening of the material discharge gate is determined, and the opening of the material discharge gates other than the specific measuring tank is adjusted to this proper opening. The material release rate is also changed for the tank. Thus, even if there is a change in the material release rate of the specific measuring tank, the release of each material can be completed at the same time, and uniform premixing can be performed.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a part of a configuration of a ready-mixed concrete production plant, wherein 1 is a gravel storage tank for storing gravel, 2 is a sand storage tank for storing sand, and 3 is a cement storage tank. This is a cement storage tank for storing the material, and the lower part thereof is provided with material discharge gates 4, 5, 6 for discharging the material.

Below these storage tanks, a gravel measuring tank 7 for measuring gravel, a sand measuring tank 8 for measuring sand, and a cement measuring tank 9 for measuring cement are provided. , 8, and 9 are provided with material discharge gates 10, 11, and 12 for discharging the material, and each of the weighing tanks 7, 8, and 9 is provided with a weight detector 13 for detecting the weight of the material to be weighed. Have.

A substantially funnel-shaped premix chute 14 for preliminarily premixing each material discharged from the measuring tank is disposed below these measuring tanks, and a cement for guiding the release of cement is disposed in the center thereof. A discharge tube 15 is provided.

Below the premix chute 14, there is provided a mixer 16 for kneading the materials premixed by the premix chute 14 for a predetermined time.

Reference numeral 17 denotes a material release control device for controlling the release of material from each measuring tank. The material release control device 17 includes a fuzzy control unit 18 for performing fuzzy inference based on a fuzzy set membership function and fuzzy inference rules described later. A calculation unit 19 for calculating the material release time from the weight signal and the set weighing value to be input, and a storage unit 20 for storing various data serving as a prerequisite to the input fuzzy inference rule and data for inference.
It has. The apparatus also includes a setting input section 21 for inputting the data and predetermined setting data, and an input / output section 22 for outputting an opening / closing signal of the discharge gate of the weighing tank and receiving a weight signal.

Then, at the time of material discharge, the material discharge completion time when the material discharge gate is fully opened with respect to the set measurement value in each measuring tank is calculated, and the measuring tank having the maximum discharge completion time is designated as the specific measuring tank. I do. In the specific measuring tank, the material discharge gate is fully opened for discharging, while for measuring tanks other than the specific measuring tank, the opening of the material discharging gate of each measuring tank is set to match the release completion time of the specific measuring tank. To release the material.

During the material discharge, the material discharge speed in each measuring tank is calculated. In particular, if there is a change in the material discharge speed in a specific measuring tank, the material discharge rate in another measuring tank is changed according to the degree of the change. Adjust the opening of the material discharge gate to change the speed.

Next, an example in which a series of these operations are controlled by fuzzy inference rules will be described.

First, the average discharge speed of the material when the material discharge gate is fully opened and the material is discharged at the time of maximum weighing of each measuring tank is measured and stored in advance. Next, when the blending value of the ready-mixed concrete to be manufactured is selected and the set measurement values of the gravel, sand, cement and other materials are set, the arithmetic unit 19 prestores the average in each measuring tank. The release completion time of the material in each measuring tank is calculated from the release speed.

The measuring tank having the longest discharge completion time is defined as a specific measuring tank. For example, if the release of gravel takes the longest, this gravel measuring tank is set as a specific measuring tank.

Next, for the measuring tanks other than the specific measuring tank, that is, for the sand measuring tank and the cement measuring tank, the ratio of the set measuring value to the maximum weighing, and the average of each measuring tank with respect to the completion time of material release in the specific measuring tank. Calculate the ratio of the release completion time at the release speed. Then, the results are input to the fuzzy controller 18.

The fuzzy control unit 18 estimates the proper opening of the material discharge gate in each measuring tank based on these data based on the membership function of the fuzzy set and the fuzzy inference rules. When the proper opening of each material discharge gate is determined, the proper opening signal is sent to each material discharge gate via the input / output unit 22 to open each material discharge gate.

FIG. 2 shows a membership function for qualitatively evaluating the ratio W between the maximum weighing capacity of the weighing tank and the set weighing value. W (i) (i = 0 to 3) in the figure is a constant that defines the form of the membership function and is determined as appropriate. ZR, PS, PM, and PB are names given to the membership function for qualitatively evaluating the magnitude of the ratio W of the set measurement value, and have the following meanings.

ZR: Zero PS: Positive Small PM: Positive Medium PB: Positive Big Also, the vertical axis in the figure is a membership value. The ratio W of the set weighing value set this time using this membership function
Is qualitatively evaluated.

FIG. 3 shows a membership function for qualitatively evaluating the magnitude of the release completion time ratio T. T (i) (i = 0 to 3) in the figure is a constant that defines the form of the membership function and is determined as appropriate. ZR, PS, P
M and PB are names given to the membership function for qualitatively evaluating the magnitude of the ratio W of the set weighing value, and the meaning is as described above.

FIG. 4 is an inference rule for qualitatively determining the appropriate opening S of the material discharge gate of each measuring tank from a qualitative function of the ratio W of the set measured value and the ratio T of the discharge completion time. For example, the inference rule in the lower right corner is IF (Wis PB and Tis PB) T
HEN SisPB. This means that if the percentage of the set weighing value is very large relative to the maximum weighing capacity of the weighing tank and the time to release at the average release rate of the weighing tank is very large relative to the time to complete the release of the specific weighing value. ”(Antecedent),
"Make the material discharge gate of the measuring tank extremely open"
(Consequent part).

FIG. 5 is a membership function for converting the qualitatively determined opening of the material discharge gate into a quantitative value. S (i) (i = 0 to 3) in the figure is a constant that defines the form of the membership function, and is an opening degree of the discharge gate with respect to the set weighing value and the discharge completion time, which is appropriately determined. ZR, PS, PM, and PB are names given to the membership function to qualitatively evaluate the magnitude of the opening S of the material discharge gate with respect to the set weighing value and the discharge completion time, and are used in FIG. Corresponding to the name.
The vertical axis in the figure is the membership value. The applied inference rules determine qualitatively which membership function the degree of opening of the material discharge gate with respect to the set metric value and the discharge completion time belongs to.

When the opening of the material discharge gate with respect to the set weighing value and the discharge completion time is determined in this way and the discharge is started, the weight reduction value of the material in each weighing tank is determined at predetermined time intervals, for example, for example. The weight is detected by the weight detector 13 at a sampling cycle of about 100 ms, and the material release speed is calculated by the calculation unit 19 from the value.

In particular, the material release rate of the gravel measuring tank 7 specified as the specific measuring tank, for example, is sequentially detected,
The difference ΔV between the material release rate and the average release rate obtained by fully opening the material release gate in advance is determined by the fuzzy controller 18.
To enter. The fuzzy control unit 18 estimates the opening correction amount ΔS of the material discharge gate of another measuring tank with respect to the change of the material discharging speed in the specific measuring tank based on the membership function of the fuzzy set and the inference rule from the input data. I do.
Then, based on this correction amount, the degree of opening of the material discharge gate other than the specific measuring tank is corrected so as to obtain a discharging speed corresponding to the change in the material discharging speed in the specific measuring tank.

FIG. 6 shows a membership function for qualitatively evaluating the magnitude of the difference value of the material release rate in the specific measuring tank. ΔV (i) (i = 1 to 7) in the figure is a constant that defines the form of the membership function and is determined as appropriate. NB, NM, NS, ZR, PS, PM, and PB are names given to the membership function to qualitatively evaluate the magnitude of the difference between the material release rates. NB: Negative Big NM: Negative Medium NS: Negative Small ZR: Zero PS: Positive Small PM: Positive Medium PB: Positive Big.

The vertical axis in the figure is the membership value. Using this membership function, the magnitude of the difference ΔV of the material release rates detected this time is qualitatively evaluated.

FIG. 7 is an inference rule for determining the opening correction amount ΔS of the material discharge gate from the qualitative function of the difference value ΔV of the material discharge speed. For example, the inference rule at the lower right is IF (△ VisPB) THEN △ Sis
Represents the meaning PB. This is based on the rule that “if the difference value ΔV of the material discharge speed is very large” (the antecedent part) and “Let the material discharge gate opening correction amount ΔS be very large” (the consequent part). Is shown.

FIG. 8 shows a membership function for converting the qualitatively determined opening correction amount ΔS of the material discharge gate into a quantitative value. △ S (i) in the figure (i = 1 to
7) is a constant that defines the form of the membership function,
The opening correction amount ΔS of the material discharge gate with respect to the difference value ΔV of the material discharge speed is appropriately determined. NB, NM, N
S, ZR, PS, PM, and PB are names given to the membership function to qualitatively evaluate the magnitude of the opening correction amount ΔS of the material discharge gate, and are the names used in FIG. Yes, it is. The vertical axis in the figure is the membership value.

Then, according to the applied inference rule, the difference value of the material discharge speed {the correction amount of the opening degree of the discharge gate with respect to V}
Which membership function S belongs qualitatively is determined.

As described above, the opening of the material discharge gate is determined in accordance with the set weighing value in each weighing tank and the completion time of the release of the material in the specific weighing tank, and the discharge of the material is started. Further, each material is discharged to the premix chute at the same ratio based on the set weighing value, and the release is completed almost at the same time, so that the premix in the premix chute can be effectively performed. Further, by detecting a change in the material release speed of the specific measuring tank and appropriately changing the material releasing speed in the measuring tanks other than the specific measuring tank, more accurate premixing can be performed.

[0040]

As described above, according to the method for charging a material into a mixer according to the first aspect of the present invention, various materials measured by individual measuring tanks are premixed in a premix chute while being premixed in a lower mixer. At the time of setting, when the set weighing value of each material for each weighing tank is set, the discharge completion time in each weighing tank is calculated, and the weighing tank with the longest release completion time is specified and specified weighing is performed. At the start of material release, the material discharge gate is fully opened in the specific measuring tank, and the release time of the material in each measuring tank almost coincides with the release time of the material in the specific measuring tank in the measuring tanks other than the specific measuring tank. The material is discharged by adjusting the opening of the material discharge gate so that each material is discharged at the same ratio into the premix chute before being charged into the mixer, and the discharge is completed almost at the same time. Effectively perform preliminary mixing in the premix chute before the mixer is turned on and be Rukoto.

According to the method for charging a material into a mixer according to a second aspect of the present invention, at the time of discharging the material, the material releasing speed of each measuring tank is calculated, and when the discharging speed in a specific measuring tank changes, the material discharging speed is changed. Since the material release rate was changed by changing the opening of the material discharge gate of the measuring tank other than the specific measuring tank, each material was released at the same ratio even if the release rate in the specific measuring tank changed, In addition, the release can be completed almost at the same time, and the premixing can be effectively performed.

According to a third aspect of the present invention, the degree of opening of the material discharge gate is adjusted by adjusting the ratio of the set weighing value to the maximum weighing value in each weighing tank and the specific weighing tank. The discharge completion time and the ratio of the discharge completion time when the material discharge gate is fully opened to the set measurement value of each measuring tank are defined as the antecedent of the fuzzy inference rule, and the material discharge gate of each measuring tank with respect to the discharge completion time of the specific measuring tank. The opening of the material discharge gate of each measuring tank is determined by fuzzy inference based on the set weighing value at the time of each material release and the discharge completion time of the specific measuring tank, as the consequent part. The opening of the material discharge gate in the tank can be set by fuzzy inference, and the materials can be discharged at the same ratio and the discharge can be completed almost at the same time, so that premixing can be performed effectively.

According to a fourth aspect of the present invention, in the method of charging a material into a mixer, the material discharge speed is adjusted by fuzzily calculating a difference value of a discharge speed with respect to an average discharge speed when a material discharge gate is fully opened in a specific measuring tank. The antecedent part of the inference rules, and the consequent part is the amount of correction of the degree of opening of the material discharge gate that obtains the appropriate release speed of the measuring tanks other than the specific measuring tank. Is calculated every predetermined time,
In each case, fuzzy inference is performed based on the degree of change of the discharge rate in the specific measuring tank, the appropriate amount of opening correction of the material discharge gate in the measuring tank other than the specific measuring tank is determined, and the material discharging rate of each measuring tank is determined. Since the adjustment is made, the opening degree of the material discharge gate of another measuring tank can be set by fuzzy inference according to the change of the material discharging speed of the specific measuring tank, each material is discharged at the same ratio, and The release can be completed at about the same time, and premixing can be performed effectively.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment of a ready-mixed concrete production plant employing a material discharging method according to the present invention.

FIG. 2 is a diagram showing a membership function for evaluating a ratio between a maximum weighing capacity of a weighing tank and a set weighing value.

FIG. 3 is a diagram showing a membership function for evaluating the ratio of release completion time.

FIG. 4 is a diagram showing an example of a rule for estimating an appropriate opening of a material discharge gate.

FIG. 5 is a diagram showing a membership function for evaluating the degree of opening of a material discharge gate.

FIG. 6 is a diagram showing a membership function for evaluating the magnitude of the difference value of the material release rates.

FIG. 7 is a diagram illustrating an example of a rule for estimating an opening correction amount of a material discharge gate.

FIG. 8 is a diagram showing a membership function for evaluating the magnitude of an opening correction amount of a material discharge gate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gravel storage tank 2 ... Sand storage tank 3 ... Cement storage tank 7 ... Gravel measuring tank 8 ... Sand measuring tank 9 ... Cement measuring tank 10 ... Material discharge gate 11 ... Material discharge gate 12 ... Material discharge gate 13 ... Weight detector 14 Premix chute 16 Mixer 17 Material release control device 18 Fuzzy control unit

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 9, 1998 (1998.9.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

According to a fourth aspect of the present invention, in the method of charging a material into a mixer, the material discharge speed is adjusted by calculating a difference value of a discharge speed with respect to a discharge average speed when a material discharge gate is fully opened in a specific measuring tank. with the antecedent part of the fuzzy inference rules, the opening correction amount of the material discharge gate to obtain a proper release rate of the measuring tank other than the specified measuring tank and consequent release of the respective measuring tank simultaneously released for each material The speed is calculated at predetermined time intervals, and fuzzy inference is performed each time based on the degree of change of the release speed in the specific measuring tank, and an appropriate material discharge gate opening correction amount in the measuring tank other than the specific measuring tank is determined. In this case, the material discharge speed of each measuring tank is adjusted.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction contents]

According to a fourth aspect of the present invention, in the method of charging a material into a mixer, the material discharge speed is adjusted by fuzzily calculating a difference value of a discharge speed with respect to an average discharge speed when a material discharge gate is fully opened in a specific measuring tank. with the antecedent of the inference rule, the opening correction amount of the material discharge gate to obtain a proper release rate of the measuring tank other than the specified measuring tank and consequent release rate at each measuring tank simultaneously released for each material Is calculated every predetermined time,
In each case, fuzzy inference is performed based on the degree of change of the discharge rate in the specific measuring tank, the appropriate amount of opening correction of the material discharge gate in the measuring tank other than the specific measuring tank is determined, and the material discharging rate of each measuring tank is determined. Since the adjustment is made, the opening degree of the material discharge gate of another measuring tank can be set by fuzzy inference according to the change of the material discharging speed of the specific measuring tank, each material is discharged at the same ratio, and The release can be completed almost at the same time, and premixing can be effectively performed.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) G05B 13/02 G05B 13/02 NF term (Reference) 4G037 AA04 AA05 BA06 BB06 BB12 BB22 BB23 BC02 BC05 BD05 BD07 BD08 BE01 BE02 BE03 EA03 4G056 AA06 CB02 CB13 CC01 CC31 CC37 CD01 DA05 5H004 GA40 GB01 HA13 HB11 JA03 JA14 KD02 KD18 KD19

Claims (4)

[Claims] 1. A discharge completion time corresponding to a set measurement value of each material in each measuring tank when various materials measured by individual measuring tanks are charged into a lower mixer while being premixed in a premix chute. Among them, the measuring tank with the maximum release completion time is specified and specified as a specific measuring tank.At the start of material release, the material discharge gate is fully opened in the specific measuring tank, and the material is discharged in the measuring tanks other than the specific measuring tank. A method for charging a material into a mixer, wherein the material is discharged by adjusting the opening of a material discharge gate so that the discharge completion time substantially coincides with the material discharge completion time in a specific measuring tank. 2. When the material is discharged, the material discharge speed of each measuring tank is calculated, and when the discharge speed in the specific measuring tank changes, the degree of opening of the material discharging gate of the measuring tank other than the specific measuring tank depends on the degree of the change. 2. The method according to claim 1, wherein the material discharge speed is varied by changing the material discharge speed. 3. The method according to claim 1, wherein the opening of the material discharge gate is adjusted by a ratio of a set weighing value to a maximum weighing value in each weighing tank.
The release completion time of the specific measurement tank and the ratio of the release completion time when the material discharge gate is fully opened to the set measurement value of each measurement tank are defined as the antecedent of the fuzzy inference rule, and each measurement tank relative to the release completion time of the specific measurement tank is used. The degree of opening of the material discharge gate of each measuring tank is determined by fuzzy inference from the set weighing value at the time of releasing each material, the discharge completion time of the specific measuring tank, and the opening degree of the material discharging gate of The method according to claim 1, wherein the material is charged into the mixer. 4. The method according to claim 1, wherein the material release rate is adjusted by setting a difference value of a release rate to an average release rate when the material discharge gate is fully opened in the specific measuring tank as a prerequisite to the fuzzy inference rule. The opening correction amount of the material discharge gate that obtains the proper discharge rate of the measuring tank is taken as the consequent part, and the measuring speed in each measuring tank is calculated every predetermined time simultaneously with the release of each material, each time the specific measuring tank The fuzzy inference is performed based on the degree of change of the release speed, and the material release speed of each measurement tank is adjusted by determining the appropriate correction amount of the opening of the material release gate in the measurement tank other than the specific measurement tank. 3. The method according to claim 2, wherein the material is charged into the mixer.