JPH0822547B2 - Control method of earth-based measuring mixer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a construction mixer for water,
The present invention relates to a control method performed when various materials such as cement and clay are mixed in a required mixing ratio.

[0002]

2. Description of the Related Art A measuring mixer capable of automatically measuring and mixing earth building materials such as cement has already been proposed by the applicant and actually exists. It is as follows.

That is, as shown in FIG. 4, the measuring mixer comprises a mixing and stirring device 1 and a control device 2 for controlling the mixing and stirring device 1. Then, the mixing and stirring apparatus 1 suspends the mixing container 5 on the frame 3 via the load cell 4, and fixes the motor 7 for rotating the stirring blade 6 arranged inside the container 5 to the lid 8. Further, the control device 2 is provided with an electronic weighing device 8 to which a signal is transmitted from the load cell 4 and a main control circuit 9 in which a microcomputer operating in connection with the electronic weighing device 8 is incorporated. The lid 8 is provided with a water supply port 10 and a supply port 11 for cement, clay, sand or the like, and a dispensing port 12 is provided at the bottom of the container 5.

[0004]

In order to achieve the above object, in the present invention, the weight of a mixing container is weighed via a load cell, and various materials such as cement are sequentially weighed by a weighing mixer. While supplying and automatically stirring and mixing, an electronic metering device with a built-in stability detection circuit, a main control circuit with a built-in microcomputer, and an inverter because the rotation speed of the stirring blade drive motor is changed by the frequency change An inverter control analog circuit that is provided with the control signal output from the main control circuit and a motor that receives the signal output from the analog circuit and that is supplied with power for rotating the stirring blade drive motor from the power supply Through the control circuit, the rotation speed of the stirring blade drive motor, the amplitude of the measured value by the load cell is always within the predetermined range Una wherein the controlled is possible to only large possible.

When the above-mentioned metering mixer is used, the control device 2 is operated, so that, for example, the electromagnetic on-off valve 17 is first opened so that the water w as the first material is stored in the container 5. The weight of the water w is detected by the electronic metering device 8 via the load cell 4, and the electromagnetic on-off valve 17 is closed when the water w reaches the required amount in connection with this detection. . Next, the motors 17a and 17d are rotated based on the information previously input to the main control circuit 9 to start the supply of the second material (for example, clay a1), while the motor 7 is rotated to rotate the stirring blades 6 When the second material a1 supplied into the container 5 reaches, for example, about 80% of its expected supply amount under this state, this is mainly controlled by the detection of the electronic weighing device 8. Device 9 will make the decision, and in this connection,
The motor 7 is now stopped in order to carry out a precise weighing. Then, the motors 17a and 17d are operated so that the insufficient amount of the material a1 is slowly replenished in a state where the vibration of the container 5 due to the rotation of the motor 7 is eliminated. When the material a1 in the container 5 reaches the planned supply amount, the electronic metering device 8 outputs a quantitative signal and in association with this, the operation of the motors 17a and 17d is stopped.
The supply of 1 ends. Then, the main control circuit 9 is preliminarily supplied so as to supply the third material (for example, different type of clay a2).
When the required information is input to the motor 7, the motor 7 is automatically rotated again and the material a2 is supplied. At this time, the planned supply amount of the third material a2 is the same as described above. For example, when about 80% of the material is supplied, the motor 7 is stopped, and then the shortage amount of the material a2 is replenished, and when the material a1 in the container 5 reaches the planned supply amount, the motor 17b is supplied. , 17d are stopped, and the supply of the same material a2 is completed. Next, when necessary information is input in advance to the main control circuit 9 so as to supply another material a3 in advance, the material a3 of the second material a1 and a3 is also supplied, as in the case of supplying the second material a1 and a2. The motor 7 is stopped during the supply,
Under this condition, the shortage amount is supplied so that the planned supply amount of the material a3 is supplied into the container 5.
When all the materials a1, a2, a3 are supplied into the container 5 in this way, the motor 7 is automatically rotated again to perform the final mixing process. Is discharged from the outlet 12 to a required place.

[0006]

In the above-mentioned conventional mixing processing by the measuring mixer, each material (excluding water) a1, in order to form various materials into the container 5 with an accurate mixing ratio, Whenever a2 or a3 is supplied, the rotation of the stirring motor 7 is stopped during the supply of the a2 or a3, and the vibration of the container 5 caused by the rotation is eliminated to replenish the shortage amount. Stopping the rotation of the motor 7 significantly reduces the work efficiency, and because the motor 7 is always rotated only at the rated rotation speed in the steady state during stirring, it is caused by the improper rotation speed. As a result, the container 5 vibrates greatly, which causes large noise and damages the surrounding environment. The present invention aims to rationally eliminate such problems.

[0004]

In order to achieve the above object, in the present invention, the weight of a mixing container is weighed via a load cell, and various materials such as cement are sequentially weighed by a weighing mixer. While supplying and mixing automatically, the number of rotations of the motor for rotating the stirring blade should be as large as possible so that the amplitude of the measured value by the load cell is always within a predetermined range. It is characterized by controlling to.

[0005]

The rotation of the motor is controlled so that the amplitude of the measured value (electrical signal) by the load cell, that is, the amplitude of the container is within a certain range. Therefore, even when the motor is rotating, accurate measurement by the load cell is performed. Will be seen. Therefore, even if the motor is not stopped during the material supply, that is, it is possible to continuously measure various materials even while the motor is rotating, and the vibration of the container does not increase. The noise caused by the vibration of the container is reduced. On the other hand, since the motor is rotated at the maximum number of rotations within the allowable range, the deterioration of the mixing action by the stirring blades can be minimized.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram of a control device used for carrying out the present invention, FIG. 2 is a flow chart showing the flow of processing according to the present invention, and FIG. 3 shows changes in the number of rotations of a motor over time. It is a graph. It should be noted that the same parts as those of the conventional example in the apparatus used for implementing the present invention will be described by citing the conventional example.

In the present invention, when the various materials w, a1, a2 and a3 are automatically mixed by using the measuring mixer, the rotation speed of the motor 7 for rotating the stirring blade 6 is set to the value measured by the load cell 4. The amplitude is controlled to be as large as possible so that it does not exceed a certain value.
Therefore, for example, the control device 2 of the measuring mixer is as follows. That is, as shown in FIG. 1, in addition to providing the electronic weighing device 8 with the built-in stability detection circuit 8a and the main control circuit 9 with the built-in microcomputer, the rotation speed of the motor 7 is further changed by the frequency change. And an inverter control analog circuit 19 to which a control signal output from the main control circuit 9 is input, and the inverter 18 outputs a signal output from the analog circuit 19 for signal conversion. The analog control circuit 20 is provided, and the motor control circuit 22 to which the signal generated by the analog circuit 20 is input and which is supplied with the power for rotating the motor 7 from the power supply 21 is also provided. Further, the microcomputer in the main control circuit 9 operates in accordance with a required program created in advance, and for example, the measured value detected by the load cell 4 while the motor 7 is rotating is based on an amplitude of a certain magnitude. When a signal notifying that the motor is vibrating greatly is issued from the stability detection circuit 8a, the rotation speed of the motor 7 is gradually decreased until the amplitude becomes smaller than a certain magnitude, as indicated by the symbol s1 in FIG. To operate,
Further, when the state in which the amplitude is smaller than a certain magnitude is continued for a longer time than a certain time as indicated by the reference numeral s2 in the figure, the rotation speed of the motor 7 is indicated by the reference numeral s3 in the figure. Is increased little by little, and when the amplitude again becomes larger than a certain magnitude in the process of rising in this way, the rotation speed of the motor 7 is again set as indicated by the symbol s4 in FIG. The motor 7 is operated so as to be gradually decreased, and the motor 7 is repeatedly operated.
Of the load cell 4 is controlled so that the amplitude of the measured value by the load cell 4 is always a fixed value or less,
When the rotation of the motor 7 is completed, the rotation number of the motor 7 suitable for the condition at that time is calculated from the data of the rotation number of the motor 7 during the operation so far, and this is stored and stored in the next operation. It is assumed that the motor 7 operates so as to set the initial rotation speed of the motor 7 to the stored value. In this case, the inverter control analog circuit 19 and the signal conversion analog circuit 20 are replaced with an inverter control digital circuit 19 'and a signal conversion digital circuit 20' which are digital circuits and have similar functions. It doesn't matter.

Further, while the material in the container 5 is being stirred by the motor 7, a new material is supplied into the container 5 and the required amount is measured. Since the number of rotations of the motor 7 at the time of this material supply is controlled to a level that does not hinder the material measurement by the electronic measuring device 8, even if a new material is supplied while stirring the material, The measurement will be accurate. The fact that the motor is not stopped when the materials are supplied in this way significantly improves the efficiency of the mixing process.

The present invention is particularly useful in automatically performing a mixing process of a plurality of batches, which will be described below with reference to the flow chart of FIG.

When the automatic operation switch of the control device 2 is turned on when the entire device is in a stopped state, the entire device is brought into a functional state. Then, if the information to measure the water is input in advance, the operation of the apparatus proceeds to YES at the determination position J1 based on this information. At this time, since the load cell 4 senses the weight of the container 5 and transmits the detection signal to the electronic weighing device 8, accurate weighing cannot be performed as it is. The weight is subtracted as the tare weight. Under this state, the electromagnetic opening / closing valve 17 is opened to start water supply, and when the water w in the container 5 reaches the predetermined amount, the electronic metering device 8 detects this and issues a quantitative signal and is related to this. Then, the electromagnetic opening / closing valve 17 is closed and the water supply is stopped. Thus, the water w is in the state of being supplied to the container 5 by the planned supply amount.

When the information for carrying out the weighing of the clay a1 is inputted in advance, the operation of the apparatus proceeds to YES at the judgment position J2 based on this information. At this time
Since the load cell 4 senses the weight of both the container 5 and the water w supplied to the inside of the container 5, the weight value of the electronic weighing device 8 is subtracted from the weight value as the tare weight as described above. Next, the motors 17a and 17d are operated to supply the clay a1, while the motor 7 is rotated. At this time, the number of rotations of the motor 7 is initially set to the rated number of rotations, but as described above, it is controlled so as to reach the maximum value at which accurate measurement can be performed with the passage of time. Therefore, the material a1 in the container 5 can be accurately measured even under the agitated condition. When the clay a1 reaches the planned supply amount, the electronic weighing device 8 detects it and issues a quantitative signal as described above, and in association with this, the motor 17
b and 17d are stopped, and the supply of the clay a2 is stopped, so that the processing reaches the position of the reference sign X3 in FIG. Thus, the clay a2 is in the state of being supplied into the container 5 by the planned supply amount.

Next, when the judgment position J3 is reached, if the information to measure another clay a2 is inputted in advance, the process proceeds to YES, and the clay a2 is operated by the operation according to the above.
Is supplied into the container 5 by the planned supply amount under the condition that the motor is rotating.

Further, if the information that the cement a3 is to be weighed is input in advance when the discriminating position J4 is reached, the operation of the apparatus proceeds to YES based on this information,
By the operation according to the above, the process of subtracting the tare weight from the measured value of the electronic weighing device 8 is performed, and then the cement a3
Is in a state in which the planned supply amount is supplied under the condition that the motor 7 is rotating.

When various materials are supplied into the container 5 in this manner, the motor is rotated for a fixed time arbitrarily set from this point to carry out the final mixing and stirring. Will be stopped. After this, the mixed material in the container 5 is automatically discharged from the outlet 12.

When the payout is completed, the final judgment position J5 is reached. Here, it is judged whether or not the number of mixing processes reaches the preset number of batches, and it is judged that the mixing process is not completed yet. If so, the process proceeds to NO to reach the position of code x2. As a result, the apparatus is automatically started again and the same processing as described above is repeated. On the other hand, when it is determined that the number of mixing processes has reached the preset number of batches, Y is determined at the determination position J5.
The process proceeds to ES, reaches the position of the code X1, and the entire apparatus is stopped.

In the above embodiment, the number of kinds of materials to be mixed and the number of batches can be arbitrarily determined.

[0017]

As described above, according to the present invention, the rotation of the motor is controlled so that the amplitude of the measured value by the load cell is always smaller than a fixed value during the continuous fixed amount supply of various materials. The planned supply amount of the material can be accurately and rapidly supplied even during the stirring of the material in the inside. Therefore, it is not necessary to stop the rotation of the motor every time the material is supplied unlike the conventional case. The efficiency of the mixing process is improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a control device used for implementing the present invention.

FIG. 2 is a flowchart showing a flow of processing according to the present invention.

FIG. 3 is a graph showing changes in the number of rotations of the motor with the passage of time.

FIG. 4 is a schematic diagram of a mixer plant including a measuring mixer.

[Explanation of symbols]

 a1 and a2 and a3 Material 4 Load cell 5 Container 6 Stirring blade 7 Motor

Claims (1)

[Claims] 1. A stable mixer is provided when the weight of a mixing container is measured through a load cell and various materials such as cement are sequentially measured while being supplied at a predetermined fixed amount and automatically stirred and mixed. Electronic measuring device with built-in detection circuit, main control circuit with built-in microcomputer,
An inverter for changing the number of revolutions of the stirring blade drive motor by changing the frequency is provided, and an analog circuit for inverter control to which a control signal issued from the main control circuit is input and a signal issued from the analog circuit are also input. Through the motor control circuit that is supplied with power to rotate the stirring blade drive motor from the power supply, the rotation speed of the stirring blade drive motor can be controlled so that the amplitude of the measured value by the load cell is always within a predetermined range. A method for controlling a measuring mixer for an earth building, which is characterized by being controlled so as to be large.