JPS58969B2 - Mixing ratio correction device in concrete material mixing ratio setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing ratio correction device for a mixing ratio setting device for setting the mixing ratio of concrete materials using a punch card or the like.

In a batcher plant, the weight of the surface water of the sand obtained by multiplying the set weight of sand by the moisture content value of the sand is subtracted from the weight of the kneading water supplied to the water measuring tank, and at the same time the weight of the sand supplied to the sand measuring tank is calculated. The hardness of the concrete slump is kept almost constant by making a correction by adding the

At this time, if you use an automatic moisture meter, such as a capacitive moisture meter, you can measure the moisture content of the surface water of the sand, but if you use the moisture content value obtained by the same moisture meter as is for the above calculations and corrections, Concrete slump becomes too hard,
There was a problem that it became too soft.

In other words, although the same moisture meter measures relatively correctly when the moisture content is, for example, 9%, it tends to measure too little when the moisture content is about 10% or more, and too much when it is about 8% or less. It is said that if the above calculation and correction are performed in the case above, the material will become too hard, and if the above calculation and correction are performed in the case of less than about 8%, the material will become too soft.

As already mentioned, the factor that determines the hardness of fresh concrete slump is the moisture content of the surface water of the sand, but other factors such as the grain distribution of the sand, the amount of air, and the temperature also have some influence.

Therefore, unless the moisture content of the sand surface water measured by an automatic moisture meter is corrected within a range of ±2% or 2%, there is a problem in that the hardness of the ready-mixed concrete slump manufactured by the Batcha brand cannot be made constant. Ta.

The present invention addresses the above-mentioned problems by opening a metering and discharging device installed at the bottom of each concrete material storage tank for a predetermined period of time from each set voltage corresponding to the mixed weight of each concrete material, thereby discharging each concrete material individually. The concrete material mixing ratio setting device that supplies a predetermined amount from the storage tank to each concrete material measuring tank placed below each tank automatically measures the moisture content of the surface water of the sand stored in the sand storage tank or sand measuring tank. an automatic moisture meter that corrects the voltage corresponding to the moisture content value measured by the moisture meter, and a moisture content value correction device that corrects the voltage corresponding to the moisture content value measured by the moisture meter; This device is characterized by comprising a surface water correction device that adds to the set voltage of sand, and its purpose is to measure the moisture content of the surface water of sand when the moisture content is 10%. If above, reduce to 8%
The hardness of concrete slump can be kept constant even if the surface water of the sand is measured using an automatic moisture meter such as a capacitance moisture meter, which tends to measure the hardness of concrete slump. The present invention provides a mixing ratio correction device.

Next, the mixing ratio correction device in the concrete material mixing ratio setting device of the present invention will be explained with reference to an embodiment shown in FIGS. 1 to 6. FIG. 1 shows the mixing ratio setting device for mixing water;
is a head tank that stores kneading water from a kneading water tank (not shown), 2 is a large-diameter solenoid valve for supplying kneading water (kneading water metering and discharging device), and 3 is a small-diameter solenoid valve for supplying kneading water (kneading water 4 is a mixing water measuring tank, 5 is a mixer, 6 is a card reader, 7 is a punch card having holes according to the mixing weight of each concrete material, 8 is a servo amplifier, 9 is a setting potentiometer, 10 is the servo morph for setting, 1
1 is a measuring dial for kneading water, 12a is a measuring pointer of the same dial 11, 12b is a setting pointer of the same dial 11, 13 is a measuring potentiometer, 14 is a measuring servo motor,
15 is a servo amplifier for measurement, 16 is a potentiometer for measurement transmission, 17 is a pendulum weight, 18 is a comparator, 19 is an operation panel, and when the punch card 7 is inserted into the card reader 6, the set voltage V1 for kneading water is detected by the servo amplifier. 8 to the setting potentiometer 9 and the setting servo motor 0, and the setting servo motor 0 drives the setting amount to control the dial 11 (setting pointer 1).
2b) instructs the setting value.

At this time, press the metering push button switch (not shown) provided on the operation panel 19, open the kneading water supply solenoid valves 2 and 3, and supply the kneading water from the herad tank 1 to the kneading water measuring tank 4. Start.

At this time, the measurement voltage V1' is obtained by the measurement transmission potentiometer 6, and this measurement voltage V1' is sent to the measurement potentiometer 3 and the measurement servo motor 4 through the measurement serve amplifier 15, When driven, the dial 11 (weighing pointer 12a) indicates a measured value.

In addition, the set voltage ■1 output from the card reader 6 and the metering voltage ■1' output from the metering transmission potentiometer 6 are sent to the comparator 18 and compared, and the metering voltage ■1' is approximately 90% higher than the set voltage ■1. %, the large-diameter kneading water supply solenoid valve 2 is closed, and when it reaches 100%, the small-diameter kneading water supply solenoid valve 3 is closed, and the kneading water is discharged from the kneading water head tank 1. Metering into the weighing tank 4 is now completed.

Figure 2 shows the sand mixing ratio setting device, 5 to 8, 15, 1
8. 19 is the same part as each in FIG. 1, 20 is a sand storage tank, 21 is a discharge gate (sand measuring and discharging device) provided at the bottom of the sand storage tank 20, and 22 is for opening and closing the same discharge gate 21. 23 is a sand measuring tank, 24 is a potentiometer for setting, 25 is a servo motor for setting, 26 is a sand measuring dial, 27a is a measuring pointer for the same dial 26, 2
7a is a setting pointer for the same dial 26, 28 is a metering potentiometer, 29 is a metering servo motor, 30 is a metering transmitting potentiometer, 31 is a pendulum weight,
32 is a metering solenoid valve, and when the punch card 7 is inserted into the card reader 6 as described above, the set voltage V2 for sand is sent to the setting potentiometer 24 and the setting servo motor 25 through the servo amplifier 8; The servo motor 25 is driven by a set amount, and the dial 26 (setting pointer 27b) is used to instruct the set value.

At this time, the metering pushbutton switch (not shown) provided on the operation panel 19 is pressed to operate the air ram 22 and discharge gate 2
1 is opened to start supplying sand from the sand storage tank 20 to the sand measuring tank 23.

At this time, the measurement voltage V2' is obtained by the measurement transmission potentiometer 30, and this measurement voltage V2' is sent to the measurement potentiometer 28 and the measurement servo motor 29 through the measurement servo amplifier 15.
9 is driven, and the dial 26 (weighing pointer 27a) instructs the measured value.

Also, the set voltage V2 output from the card reader 6 and the metering voltage V2' output from the metering transmission potentiometer 30 are sent to the comparator 18 and compared, and when the metering voltage V2' becomes approximately 90% of the set voltage V2, the discharge gate 21
Shocking (minimum discharge) is performed at 100%, and when the amount reaches 100%, the discharge gate 21 is closed and the measurement of sand from the sand storage tank 20 to the sand measuring tank 23 is completed.

Note that the cement and gravel mixing ratio setting device is substantially the same as the sand mixing ratio setting device described above, so a detailed explanation will be omitted.

Furthermore, the card reader 6 (setting voltage transmitting device) is
Of course, you can replace it with a volume setting device, magnetic reader, etc. that have the same effect.

Next, to explain the mixing ratio correction device which is the most characteristic feature of the present invention, 33 in FIG. 5 is a capacitance type moisture meter, 34 is a receiving part of the same moisture meter 33, and 35 in FIG. 3.4.5 is a capacitive moisture meter. Positive side electrode, 36 earth side electrode, 37 is the same electrode 35,3
The same electrode 35.36 is an air ram for moving the 6 forward and backward.
is advanced by the air ram 37 and inserted into the sand layer of the sand measuring tank 23, and the change in capacitance between the electrodes 35 and 36 determines the moisture content of the surface water of the sand (the weight of the sand is S, the surface water of the sand is If the weight is W, then W/S x 100%) is measured.

Note that, of course, a moisture meter that measures the moisture content by a change in electrical resistance or by neutrons may be used as the moisture meter.

Although the moisture meter 33 is attached to the sand measuring tank 23 in FIG. 5, it may also be attached to the sand storage tank 20.

Further, numeral 38 in FIG. 5 is a correction volume (moisture content value correction device) for correcting the measured value (moisture content value) output from the receiving unit 34.
The measured value from the receiving section 34 is corrected by adding the correction value from the receiver 34 to the correction value from the receiver 34 by using an adder 39.

Note that the correction volume 38 has an ON/OFF switch (not shown) for when no correction is to be performed.

Further, 40 is an A/
D converter (analog → digital converter), 41 is the same A/
A digital panel meter that numerically displays the signal from the D converter 40, 42 and 43 a buffer (buffer amplifier) that couples the signal from the adder 39 to the A/D converter 44, and 46 the buffer 42. 47 is a digital panel meter that numerically displays the signal from the A/D converter 44; 45 is the M-angle converter 44;
49 is a hold circuit that holds or releases the A/D converter 44 according to the control signal from the operation panel 19; 48 is the A/D converter 4;
4 is a conventional manual moisture correction setting device; 50 is a conventional manual moisture correction setting device;
Reference numeral 51 denotes a surface water correction device, which adjusts the resulting correction voltage by a difference from the set voltage (1) of the kneading water so that the moisture content value (voltage) of sand measured by the moisture meter 33 is corrected by a correction volume 38. The surface water correction device 51 provided in the servo amplifier 8 performs correction by adding the set voltage V2 of the sand at the same time as the set voltage V1.
As already mentioned, V2 is sent to a predetermined device.

In FIG. 5, 53 is a moisture content correction device, 54 is a measurement display control panel which includes a manual moisture correction device 50, servo amplifiers 8, 15, etc. in addition to the surface water correction device 51, and 55 is a moisture content detection unit 52. This is a measurement value printing and recording device that has the following functions.

Next, the operation of the mixing ratio correcting device in the concrete material mixing ratio setting device will be explained.

Figure 6 shows the time schedule for weighing.

In Figure 6, the leftmost sand measurement time in the fourth row from the top is 1.
is the sand supply time from the sand storage tank 20 to the sand measuring tank 23.

When the sand measuring time I is over and the discharge gate 21 is closed, the air ram 37 is actuated in the extension direction by a control signal from the operation panel 19, and the electrodes 35 and 36 of the moisture meter 33 are moved forward. enters the sand tank in the sand measuring tank 23,
The moisture content is measured (see T1 during moisture meter insertion time I in FIG. 6).

At this time, the measured value (moisture content value) is displayed on the digital panel meter 4.
It is digitized and displayed as 1, but the same panel make 41
For example, when the moisture content value is 10%, the correction volume 38
If the moisture content on the panel meter 41 is, for example, 8%, the moisture content is corrected to approximately 7% by operating the correction volume 38.

Next, a control signal is sent from the operation panel 19 to the hold circuit 49 to release the previous value held in the A/D converter 44 and at the same time to hold the moisture content value obtained by the current measurement. (See T2 in the meter insertion time ■), then send a control signal from the operation panel 19 to the air ram 33, and
3 in the reduction direction, the electrodes 35 and 36 of the moisture meter 33
is extracted from the sand layer in the sand measuring tank 23 (see T3 of moisture meter insertion time I in FIG. 6).

At this time, the total amount time I ends, and the total discharge time ■ begins, and each concrete material is discharged from each measuring tank to the mixer 5, and then the mixer kneading time I begins, and at the same time the next total amount time ■ (sand measurement time (including (2)), and the sand and kneading water are measured according to the data in I above.

The same is true thereafter, and when the sand (and kneading water) measurement time begins, the measurement of sand and kneading water is performed based on the previous data.

In this way, in the blending ratio correction device of the present invention, the automatic moisture meter 3
Since the moisture content value measured in step 3 can be corrected by the moisture content correction device 38, the oil dynamic moisture meter tends to measure less when it is 10% or more and more when it is 8% or less. Even if the moisture content of the surface water is measured, the hardness of the concrete slump produced at the Batcha plant can always be maintained constant.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a mixing ratio setting device for kneading water, Fig. 2 is an explanatory diagram showing a sand mixing ratio setting device, and Fig. 3 is an explanatory diagram showing a mixing ratio setting device for sand. Fig. 3 is an electrode of an automatic moisture meter used in the mixing ratio correction device of the present invention. FIG. 4 is a side view showing one example, FIG. 4 is a bottom view thereof, FIG. 5 is an explanatory view showing one embodiment of the mixing ratio correcting device, and FIG. 6 is an explanatory view of its operation. 1... Kneading water storage tank, 2, 3... Kneading water measuring and discharging device,
4...Kneading water measuring tank, 20...Sand storage tank, 21...Sand measuring and discharging device, 23...Sand measuring tank, 33...Automatic moisture meter,
38...Moisture content correction device, 51...Surface water correction device.

Claims (1)

[Claims] 1 The metering and discharging device installed at the bottom of each concrete material storage tank is opened for a predetermined period of time by each set voltage corresponding to the mixed weight of each concrete material, and each concrete material is placed below each concrete material from each storage tank. In the concrete material mixing ratio setting device that supplies a predetermined amount to the material measuring tank, there is an automatic moisture meter that automatically measures the moisture content of the surface water of the sand stored in the sand storage tank or sand measuring tank. A moisture content correction device that corrects a voltage corresponding to a moisture content value, and a surface water correction device that subtracts the voltage corrected by the moisture content correction device from a set voltage of kneading water and simultaneously adds it to a set voltage of sand. A mixing ratio correction device characterized by: