JPH07256628A - Method for setting speed of variable-speed mixer for mixing ready-mixed concrete or the like - Google Patents

Abstract

PURPOSE:To keep the quality of a mixture in its best state in consideration of the properties of a material to be mixed by a method wherein a frequency conversion means capable of changing the rotational frequency of a motor is actuated by an output signal of a frequency setting means outputting the mixing speed of a mixer corresponding to the properties of a concrete or the like. CONSTITUTION:A central processing means 3 selects a graph having a condition most approximating to that of a slump having compounding data displayed on a screen out of graphs each representing a relation between a slump stored in a storage part 4 and the peripheral speed of a stirring blade, and determines the peripheral speed of the stirring blade for a slump to be mixed on the basis of the graph. The central processing means 3 calculates a corresponding frequency in accordance with the value of the peripheral speed. The frequency is outputted to an interface 5 as a digital signal, which is converted to an analog signal in the interface 5. The analog signal is transmitted to an inverter 6 as a frequency conversion means. The inverter 6 rotates a motor 7 at a frequency in accordance with the amount of the analog signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a mixture of cement and other substances, and more particularly to speed control using a computer of a variable speed mixer for kneading raw concrete and the like.

[0002]

2. Description of the Related Art Conventionally, when setting the speed of a stirring blade,
The kneading machine or work efficiency such as load and kneading time of the kneaded product is targeted, and at least the properties of the fresh concrete, that is, fluidity and separability are not focused.

[0003]

When kneading ready-mixed concrete or the like, the maximum load is reduced as compared with the conventional mixer load, and the kneading keeps the quality of the kneading product in the optimum state in consideration of the properties of the kneading product. While it is being implemented.

[0004]

The present invention is a method for setting the speed of a stirring blade of a mixer by an output signal from a computer when kneading ready-mixed concrete or the like, which comprises an input unit 4 and a central processing unit 3. A variable speed motor 12 having a frequency setting means 9 including a computing means 11 including the following, a frequency converting means 6 for allowing the electric motor 7 to freely change its rotation speed, and a stirring blade 8 connected to the variable speed motor 12. An input step for storing in the storage unit 4 various mixing data of cement production such as fresh concrete and the rotation speed of the variable speed mixer 10 for the property of the mixing data, According to the kneading instruction from, the corresponding blending data is selected from the storage unit 4, and the rotation speed of the variable speed mixer 10 that matches the properties of the selected blending data is selected. A selection step of selecting at calculation means 11,
The rotation speed selected in the selecting step is set to the frequency setting means 9
According to the output step of outputting from the central processing unit 3 to the frequency conversion means 6 of the variable speed motor 12, the electric motor 7 is operated at the frequency from the frequency conversion means 6 and kneading is performed by the stirring blade 8. To be there.

[0005]

The present invention focuses on the fact that grouping is possible by distinguishing the mixing data according to the property, and that high-quality fresh concrete and the like can be kneaded if the speed of the stirring blade is set according to the property. It is a thing.

Among various compounding data, preferable stirring blade speeds are set in advance for the categories that affect fluidity, viscosity, etc., especially for the slump value and the maximum size of coarse aggregate, and stored in the storage unit of the calculating means. The peripheral speed of the stirring blade is selected by the calculation of the calculating means with respect to the specified combination data, and the frequency converting means is associated with the calculating means to rotate the stirring blade at a desired speed. .

[0007]

EXAMPLE An example of the present invention is a twin-screw in which the speed of the stirring blade is stepwise changed by one mixer, mortar is kneaded at a predetermined high speed, coarse aggregate is added, and then concrete is kneaded at a predetermined medium speed. An example of using a forced kneading variable speed mixer will be described with reference to the drawings. In the description, the peripheral speed corresponding to the change in speed is used.

FIG. 1 is a block diagram showing the construction of the embodiment, FIG. 2 is a graph showing the relationship between the slump and the peripheral speed of the stirring blade during mortar kneading, and FIG. 3 is the peripheral speed of the slump and the stirring blade during concrete mixing. It is a graph which shows a relationship. As shown in FIG. 1, the mixer in this embodiment comprises a frequency setting means 9 for determining the peripheral speed of a stirring blade of the mixer and giving an instruction, and a variable speed mixer 10 equipped with an electric motor capable of shifting by frequency conversion. In other words, the frequency setting means 9 is provided with the display means 1 and the interface 5 in the arithmetic means 11 composed of the input section 2, the central arithmetic processing section 3 and the storage section 4, and the variable speed mixer 10 is provided with the frequency conversion means 6. A variable speed motor 12 including an electric motor 7 is provided with a stirring blade 8.

A procedure for using the mixer will be described. First, prior to use, mixture data such as so-called concrete showing the mixture ratio of various cement products such as mortar and concrete to the calculating means 11 shown in the following table is input from the input unit 2 via the central processing unit 3. It is input to the storage unit 4 and stored.

[0010]

Next, a relation indicating the peripheral speed of the stirring blade with respect to the item of the section in the compounding data is input to the calculating means 11. To explain this case, the display means (CR
On the screen of No. 1), the vertical axis shows the peripheral speed of the stirring blade and the horizontal axis shows the slump, which is one of the concrete mix categories, and the coordinates are displayed with a grid displayed vertically and horizontally. To do. Further, this screen is provided with a cursor that can be moved vertically and horizontally on the coordinates. The input unit 2 includes a keyboard for moving the cursor on the display means 1,
It has a role of drawing a graph showing the relationship between the slump and the stirring blade on the coordinates of the screen through the central processing unit 3 by operating the keyboard. For the value of one slump on the horizontal axis, operate the keyboard to align the cursor in the horizontal direction, and then operate the keyboard up to the best value obtained from various tests and experience among the peripheral speeds of the mixer stirring blades on the vertical axis. By moving the vertical cursor, the coordinate value of the mixer stirring blade peripheral speed (indicated by the arrow in FIG. 2) at the intersection of the two cursors can be easily set on the coordinate. It can be completed, and it is completed by continuously connecting the coordinate values created by repeating this several times.

Similarly, the graph at the medium speed (or low speed) rotation at the time of kneading concrete can be also drawn in FIG. A large number of mortar-kneading and concrete-kneading graphs thus created are input to and stored in the storage unit 4 via the central processing unit 3.

The above description shows the case where a graph is created by taking the slump which is one of the categories as an example. However, in addition to this, a graph is created in consideration of other categories such as the maximum size of coarse aggregate. By doing so, a more appropriate value of the peripheral speed can be obtained.

After the above preparation is completed, kneading is possible. First, instruct the desired concrete mixture data from the keyboard of the input device 2, and in the materials in the mixture data,
Fine aggregate, cement, water, admixture, etc. are charged into the mixer according to the kneading amount, and kneading of mortar with a small load is started. At this time, the blending data of the mortar to be kneaded is drawn on the screen of the display means 1, the slump value is confirmed, and the central processing means 3 described above for the slump of the blending data displayed on the screen. From the graphs showing the relationship between the peripheral speeds of the slump and the stirring blade stored in the storage unit 4, the graph having the closest conditions is selected, and the peripheral speed of the stirring blade for the slump to be kneaded is determined based on the graph.

Then, the central processing means 3 calculates the equivalent frequency according to the value of the peripheral speed, and outputs the frequency to the interface 5 as a digital signal, and the interface 5 outputs the analog signal (the digital signal It may be amplified), and the analog signal is transmitted to an inverter 6 which is a frequency conversion means, and the inverter 6 rotates the electric motor 7 at a frequency corresponding to the analog signal amount.

However, the stirring blade 8 is accelerated in accordance with the rotation of the electric motor 7, and finally, the best peripheral speed for mortar kneading (high speed of about 1.5 times that of conventional concrete kneading).
The mortar of high quality is kneaded in a short time.

Next, the coarse aggregate is charged and the concrete is kneaded at a medium speed (or a low speed). In this case, the load becomes larger than that in the mortar kneading and the slump also changes. By selecting the graph for concrete kneading shown in 3 and performing the same operation, the concrete is kneaded at the peripheral speed of the best stirring blade for a certain period of time.

At this time, since gravel is put into high-quality mortar having sufficient tackiness and kneaded uniformly, there is little separation, and uniform and high-quality concrete can be kneaded in a short time.

In this embodiment, an example is shown in which the peripheral speed of the stirring blade is selected based on one section of the compounding data, but in addition to this, the peripheral speed of the stirring blade calculated according to the type of mixer used is taken into consideration. You can put it in. Further, as a display method, the rotation speed or frequency may be displayed instead of the peripheral speed. Furthermore, although the method of determining the peripheral speed has shown the example using the graph, it goes without saying that it may be expressed by other means such as a numerical table.

[0020]

The present invention is constructed as described above and has the following effects. (1) Since the peripheral speed of the mixing blade of the mixer is selected and mixed according to the mixture of the materials to be kneaded, good quality concrete can be kneaded in a short time in various concretes with different properties. . (2) Mixing a large number of concretes and the like can be grouped based on the classification, which simplifies the selection and management of the peripheral speed of the agitating blade and significantly reduces the man-hours. (3) Since the peripheral speed of the stirring blade is set based on the mixing data of concretes, etc., the peripheral speed is constant even when the kneading amount per change is changed compared to the conventional one in which the speed is changed by the load of the stirring blade. Therefore, the influence on the material is the same, and it is possible to always mix stable and high quality ready-mixed concrete.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment.

FIG. 2 is a graph showing the relationship between the slump for mortar kneading and the peripheral speed of the stirring blade.

FIG. 3 is a graph showing the relationship between the slump for concrete mixing and the peripheral speed of the stirring blade.

[Explanation of symbols]

 1 Display unit 2 Input unit 3 Central processing unit 4 Storage unit 6 Frequency conversion means (inverter) 7 Electric motor 8 Stirring blade 9 Frequency setting means 10 Variable speed mixer 11 Calculation means 12 Variable speed motor

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[Procedure amendment]

[Submission date] December 26, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Claims (2)

[Claims] 1. A method for setting a speed of a stirring blade of a mixer by an output signal from a computer when kneading ready-mixed concrete or the like, which comprises an input unit 4 and a central processing unit 3.
Frequency setting means 9 comprising arithmetic means 11
And a variable speed mixer 10 formed of a variable speed motor 12 including a frequency conversion means 6 for freely changing the rotation speed of the electric motor 7 and a stirring blade 8 connected to the variable speed motor 12, Various input data for storing various mixing data of cement products such as fresh concrete and the rotation speed of the variable speed mixer 10 for the property of the mixing data, and corresponding from the storage unit 4 according to a kneading instruction from the outside. The selecting step of selecting the compound data and selecting the rotation speed of the variable speed mixer 10 matching the property of the selected compound data with the calculating means 11, and the central operation of the frequency setting means 9 with the rotating speed selected in the selecting step. By the output step of outputting from the processing unit 3 to the frequency conversion means 6 of the variable speed motor 12, the electric motor 7 is driven at the frequency from the frequency conversion means 6.
The method for setting the speed of a variable speed mixer for kneading of ready-mixed concrete or the like, which is performed in such a manner that the above operation is performed and kneading is performed by the stirring blade 8. 2. The kneading machine for ready-mixed concrete or the like according to claim 1, wherein the frequency setting means 9 includes a display means 1 and the rotation speed of the best variable speed mixer inputted to the storage unit 4 can be displayed and confirmed. How to set the speed of the variable speed mixer.