JP2001170922A - Device for manufacturing ready-mixed concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for manufacturing a ready-mixed concrete which is capable of manufacturing a high quality ready-mixed concrete by accurately measuring the surface moisture content of sand in a sand storage tank and reflecting the measurements upon a variable. SOLUTION: This device for manufacturing a ready-mixed concrete is equipped with a moisture sensor 6 which detects the surface moisture content of sand in the sand storage tank 1 and a pressure sensor 7 which detects a pressure to work on the sand. In addition, a control part 8 for loading the detection signals of both sensors 6, 7 comprises an analytical calculation means 9 which calculates a surface moisture content approximating a true value according to a specified calculation formula based on a moisture signal value and a pressure signal value, a variable correction means 10 which corrects a sand variable based on surface moisture content data to be output from the analytical calculation means 9 and a discharge gate control means 11 which controls the opening/closing of a discharge gate 3 for the sand storage tank 1 based on variable data to be output from the variable correction means 10. Further, the surface moisture content of the sand is more accurately calculated with the help of the moisture sensor 6 and the pressure sensor 7 and the obtained calculation is reflected upon the variable. Thus material are metered and mixed without surplus and shortage as compounded.

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 ready-mixed concrete by measuring and kneading various concrete materials such as gravel, sand, cement, water and an admixture to produce ready-mixed concrete.

[0002]

2. Description of the Related Art In ready-mixed concrete production equipment, gravel,
Various concrete materials such as sand, cement, water and an admixture are weighed by a measuring tank according to a desired composition, and are kneaded by a mixer to produce ready-mixed concrete. By the way, in the production of this ready-mixed concrete, the amount of water input greatly affects the physical properties such as the strength of the concrete. The amount of water brought in is measured accurately, and the measured values of sand and water are set in consideration of the surface water amount of the sand.

[0003] Therefore, a general-purpose moisture sensor using microwaves or the like is provided in a sand storage tank above the measuring tank, and the surface moisture of the sand is measured by the moisture sensor. In some cases, the measured value of water is corrected to produce a ready-mixed concrete having a desired composition.

[0004]

However, a general-purpose moisture meter can perform accurate measurement under a certain condition, but the condition changes every moment as sand enters and exits as in a sand storage tank. At present, there are some measurement errors in some places, and the measurement errors have a considerable effect on the quality of ready-mixed concrete.

In view of the above, the present invention provides an apparatus for producing ready-mixed concrete capable of producing high-quality ready-mixed concrete by accurately measuring the surface water content of sand in a sand storage tank and reflecting the result in a measured value. The task is to provide.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to solve the above-mentioned problems, and as a result, the measurement error of the surface water content of the sand in the storage tank is caused by a change in the amount of stored sand, That is, it has been found that it is closely related to the change in pressure acting on the sand at the measurement location. FIG. 6 is a graph showing test results obtained by measuring the surface water content of the sand with a moisture meter while changing the pressure acting on the sand by placing a weight on the sand stored in the model tank. The surface water percentage output by the meter is plotted with the measured surface water percentage on the horizontal axis. The results of this test show that the moisture meter output changes when the pressure acting on the sand changes, that the higher the pressure acting on the sand, the higher the moisture meter output, and that the higher the surface water content of the sand, the greater the effect of the pressure. It was found that the output of the moisture meter varied.

[0007] Then, it was sought to derive a correlation between the output signal values of the moisture sensor and the pressure sensor and the true surface water rate. For example, as shown in FIG. 3, the moisture sensor output (mv) ÷ the pressure sensor If the output (mv) is plotted on the vertical axis and the measured sand surface water content is plotted on the horizontal axis, it can be seen that the linearity is shown for each pressure acting on the sand. The present inventors have found that it is possible to analyze and determine a surface water rate close to the true value in consideration of the pressure, and have completed the present invention.

That is, in the ready-mixed concrete manufacturing apparatus according to the present invention, a moisture sensor for detecting the surface water content of sand in the sand storage tank, a pressure sensor for detecting pressure acting on the sand, and the moisture sensor And an arithmetic operation means for calculating a surface water rate close to true from the detection signal value of the pressure sensor based on a predetermined formula, and correcting the sand weighing value based on the surface water rate data output from the analysis arithmetic means. Weight value correction means,
Discharge gate control means for controlling the opening and closing of the discharge gate of the sand storage tank based on the measurement value data output by the measurement value correction means.

[0009]

According to the ready-mixed concrete production apparatus of the present invention, before sand is discharged from the sand storage tank at the time of sand measurement, the sand sensor is provided by a moisture sensor and a pressure sensor disposed in the sand storage tank. The surface moisture and the pressure acting on the sand are detected and taken into the control unit. Then, a predetermined calculation formula and an analysis procedure for calculating a surface water rate close to true from the correlation between the moisture signal value, the pressure signal value, and the measured surface water rate are stored in the analysis calculation means of the control unit, and When the detection signal values from the moisture sensor and the pressure sensor are fetched, an analysis process is performed based on this predetermined calculation formula to calculate a near true surface water rate.

Subsequently, the calculated surface water rate data is supplied to a weighing value correcting means, and the sand weighing value is corrected based on the surface water rate data. Then, the corrected sand weighing value data is provided to the discharge gate control means, and the discharge gate control means issues an open signal to the discharge gate of the sand storage tank to start weighing, and the sand amount weighed by the sand weighing tank is corrected. When the measured value is reached, a closing signal is issued to close the discharge gate of the sand storage tank. In addition, the water measurement value is also corrected based on the surface water rate data and measured.

As described above, since the surface water content of the sand is more accurately determined by the moisture sensor and the pressure sensor and is reflected in the measured value, the materials can be mixed and mixed without excess or shortage according to the mixture, and a high quality ready-mixed concrete can be manufactured. .

[0012]

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

In FIG. 1, reference numeral 1 denotes a sand storage tank mounted on a ready-mixed concrete manufacturing apparatus. The sand storage tank 1 has a sand input section 2 at an upper part, and a discharge gate 3 for discharging sand at a lower part. Arranged to temporarily store the sand carried in from the aggregate yard, open and close the discharge gate 3 based on the shipping request, and pay out the sand appropriately to the sand measuring tank 5 equipped with the lower weight detector 4. Weigh quantitatively.

Below the sand storage tank 1, there are provided a moisture sensor 6 for detecting the surface water content of the sand and a pressure sensor 7 for detecting the pressure acting on the sand. In addition, the moisture sensor 6 is attached at a position suitable for detecting the surface water content of the sand portion discharged as one batch at the bottom of the sand storage tank 1,
Further, it is preferable that the pressure sensor 7 is also mounted close to the moisture sensor 6 so that the pressure acting on the sand at the portion where moisture is detected can be detected as accurately as possible.

Reference numeral 8 denotes a control unit for controlling the measurement of the sand,
This control unit is configured using a computer of an operation panel of the ready-mixed concrete manufacturing apparatus. The control unit 8 includes an analysis calculation unit 9 configured to calculate a surface water rate close to true from the detection signal values of the moisture sensor 6 and the pressure sensor 7 based on a predetermined calculation formula.
A weighing value correcting means 10 for correcting the sand weighing value based on the surface water rate data output from the analysis calculating means 9, and a sand storage tank based on the weighing value data output from the weighing value correcting means 10. A discharge gate control means 11 for controlling the opening and closing of one discharge gate 3 and a storage means 12 for storing a set measurement value of sand and the like are provided.

The analysis calculation means 9 stores a predetermined calculation formula and an analysis procedure for calculating a surface water rate close to true from the correlation between the moisture signal value, the pressure signal value and the actually measured surface water rate. From the detection signal values of the sensor 6 and the pressure sensor 7, it is possible to analyze and calculate a surface water rate close to true.

For example, as shown in the graph of FIG. 3, when the moisture sensor output (mv) ÷ the pressure sensor output (mv) is plotted on the ordinate and the measured sand surface water percentage is plotted on the abscissa, it is almost linear for each pressure. In addition, the relationship between the X coefficient and the Y intercept of this linear equation and the pressure is as shown in the graph of FIG.
If the output of the pressure sensor is plotted on the horizontal axis, the correlation is established on the curve equation. Therefore, if this curve equation is obtained by sampling and measuring sand in advance, the X coefficient and the Y intercept of the straight line in FIG. 3 are obtained from the output value of the pressure sensor 7, and the straight line equation (moisture sensor output ÷ pressure sensor By substituting the value of (output), it is possible to obtain a near true surface water content.

As described above, the calculating formula and the analyzing procedure derived from the correlation between the sampling sensor of the sand, the output of the moisture sensor, the output of the pressure sensor and the measured surface water rate are analyzed and analyzed by the arithmetic operation means 9.
Is stored, and a surface water rate close to true can be obtained from the detection signal values of the moisture sensor 6 and the pressure sensor 7. Note that the above-described analysis procedure is an example, and the present invention is not limited thereto. In short, some correlation is established between the moisture sensor output value, the pressure sensor output value, and the actually measured surface water rate. Therefore, it is only necessary to find the correlation equation and the analysis procedure as appropriate from the data result obtained by sampling.

FIG. 5 shows the pressure acting on the sand stored in the model tank using a moisture measuring device that measures the surface water content by the above analysis procedure from the moisture sensor output value and the pressure sensor output value. It is a graph showing the result of measuring the surface water content of the sand while changing, the vertical axis represents the measured value of the surface water content,
The abscissa plots the measured surface water percentage. Looking at the measurement results, as shown in FIG. 6, in the conventional moisture meter, when the pressure acting on the sand at the measurement point changes, the measurement value varies, resulting in a measurement error of ± 0.75%. The measurement error is at least ± 0.32%,
It can be clearly seen that the measurement accuracy has been improved.

Next, a procedure for weighing sand will be described with reference to the flowchart of FIG. S1 to S14 in the figure
Represents each step of the sand weighing procedure.

First, before starting weighing, first, the weight of sand or other material to be weighed is set as a set weighing value in the storage means 12 of the control unit 8 (S1). When the measurement start operation is performed (S2), the discharge gate 3 of the sand storage tank 1
Before the sand is released and the sand is discharged, the moisture sensor 6 disposed below the sand storage tank 1 detects the surface water content of the discharged sand (S3), and the pressure sensor 7 acts on the sand. The pressure is detected (S4), and the detection signal is taken into the control unit 8.

The analysis operation means 9 of the control unit 8 performs an analysis process according to a predetermined arithmetic expression and analysis procedure based on the taken-in moisture signal value and pressure signal value to calculate a surface water rate close to true (S5). This is set as the surface water rate at the time of measurement (S6).

When the surface water rate at the time of weighing is set, the weighed value correction means 10 calculates and corrects the set weighed value of sand previously set and stored in the storage means 12 based on the set surface water rate (S7). . At this time, the set measurement value of the kneading water to be separately measured is also corrected in consideration of the amount of water contained in the corrected sand measurement value.

When the set measurement value of the sand is corrected, the discharge gate control means 11 outputs an open signal to the discharge gate 3 of the sand storage tank 1 to open the discharge gate 3 (S8), and the lower sand The dispensing of sand into the measuring tank 5 is started (S
9).

When the discharge of sand is started, the discharge gate control means 11 starts reading the weight value of the sand detected by the weight detector 4 of the sand weighing tank 5 (S10), and reads the read weight value and the setting. The weight value is compared with the weight value (S11), and it is determined whether or not the weight value has reached the set weight value (actually, a value obtained by subtracting a drop difference from the set weight value) (S12). A closing signal is output to the discharge gate 3 to close the discharge gate 3 (S13), and the discharge of sand is stopped (S14). When the next measurement is to be performed, the procedure returns to step S1 or S2, and the same procedure is repeated.

As described above, before the sand is measured, the surface water content of the sand in the sand storage tank 1 and the pressure value acting on the sand are detected by the moisture sensor 6 and the pressure sensor 7, and a predetermined value is determined based on the detected values. Since the surface water rate is calculated by performing analysis processing according to the calculation formula and the analysis procedure of the above, the set measurement value of sand and further the set measurement value of kneading water are corrected based on this surface water rate and weighed. , Can measure and mix sand and kneading water according to the formulation
High quality ready-mixed concrete can be manufactured.

[0027]

As described above, in the ready-mixed concrete manufacturing apparatus according to the present invention, the moisture sensor for detecting the surface water content of the sand in the sand storage tank and the pressure sensor for detecting the pressure acting on the sand are provided. Analysis operation means for calculating a surface water rate close to true from the detection signal values of the moisture sensor and the pressure sensor based on a predetermined calculation formula; and sand weighing based on surface water rate data output from the analysis operation means. A moisture sensor and a pressure sensor, which have a weighing value correcting means for correcting the value, and discharge gate control means for controlling the opening and closing of the discharge gate of the sand storage tank based on the weighing value data output by the weighing value correcting means. Thus, the surface water content of the sand is accurately measured and reflected in the weighed value, and the materials can be weighed and mixed without excess or shortage according to the blending, so that high quality ready-mixed concrete can be manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a sand measuring device section of a ready-mixed concrete production device according to the present invention.

FIG. 2 is a flowchart showing a sand measuring procedure of the ready-mixed concrete production device according to the present invention.

FIG. 3 is a graph showing a correlation between a moisture sensor output, a pressure sensor output, and an actually measured surface water rate.

FIG. 4 is a graph showing a correlation between an X coefficient and a Y intercept of a straight line in FIG. 3 and an output value of a pressure sensor.

FIG. 5 is a graph showing a relationship between a surface water rate calculated based on a moisture sensor output and a pressure sensor output and an actually measured surface water rate.

FIG. 6 is a graph showing the relationship between the surface moisture content measured by a conventional moisture meter and the actually measured surface moisture content.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sand storage tank 3 ... Discharge gate 4 ... Weight detector 5 ... Sand weighing tank 6 ... Moisture sensor 7 ... Pressure sensor 8 ... Control unit 9 ... Analysis calculation means 10 ... Measured value correction means 11 ... Discharge gate control means

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Norihiro Nishio No. 1 at 1013 Eijima, Okubo-cho, Akashi-shi, Hyogo F-term in Niko Corporation (reference) 4G056 AA07 CA03 DA05 DA08

Claims (1)

[Claims] 1. A moisture sensor for detecting a surface water content of sand in a sand storage tank, a pressure sensor for detecting pressure acting on the sand,
Analysis calculating means for calculating a surface water rate close to true based on a predetermined calculation formula from the detection signal values of the moisture sensor and the pressure sensor; and a sand weighing value based on the surface water rate data output from the analysis calculating means. And a discharge gate control means for controlling opening and closing of a discharge gate of a sand storage tank based on the measurement value data output by the measurement value correction means. apparatus.