JPH0575974B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an apparatus for measuring surface water content of aggregate.

[Background technology]

Generally, concrete, mortar, etc. are made by mixing appropriate amounts of water and aggregate (sand, gravel, crushed stone) with cement, and then mixing and forming the concrete.The strength of concrete after dry forming is determined mainly by the amount of cement used. It is determined by the amount of water used, and strict control of the amount of water used is an important issue in managing and maintaining the strength of concrete. However, among the materials used above, aggregates, especially aggregates such as sand, small-grained gravel, and crushed stone, have surface water attached to them due to the mixing amount, rain before kneading, watering, etc. It was not possible to strictly control and maintain the strength of concrete by ignoring this. Therefore, it is necessary to measure the surface water percentage of the aggregate and adjust the amount of water used. Conventionally, the surface water percentage of the aggregate has been measured manually, and the surface water percentage of the aggregate can be accurately and accurately measured. It was not possible to measure quickly. Therefore, it is not possible to measure the surface water rate for each mixing batch on the production line and set the optimum amount of water to be used, and it is difficult to strictly control and maintain the strength of concrete to a specified value. There was a problem.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide an apparatus for measuring the surface water content of aggregates that can easily and quickly measure the surface water content of aggregates. It's about doing.

[Disclosure of the invention]

(Structure) FIG. 1 is a block diagram showing the structure of the present invention, and 2 is a block diagram showing the structure of the present invention.
3 is a measuring container 1 for supplying an appropriate amount of sample to the
Water injection means for injecting water W into the measuring container 1; 4 is a water flow control means for controlling the water level in the measuring container 1 to a predetermined water level; 5 is a water supply means for injecting the supplied aggregate S and the injected water W;
6 is a measuring means that automatically measures the weight of the sample when supplying the sample or when water injection is completed; 6 is a measuring means that measures the shape data of the measuring container 1 and the surface dry specific gravity data of the aggregate S (specific gravity data when the surface is dry after removing surface water); 7 is a data input means for inputting data; 7 is a calculation means for calculating the surface water percentage based on the measurement data output from the measurement means 5 and the input data input by the data input means 6; 8 is a transportation means for the weighing container 1; and a container transport cleaning means for cleaning; 9 a lifting means for raising and lowering the water injection means 3 and the water level control means 4; 10 a control device for sequentially controlling the operations of each means 2 to 9;
Reference numeral 11 denotes a concrete mixture control machine that manages the mixing ratio of concrete (particularly the amount of water used) based on the surface water rate calculated by the calculation means 7, and 12 denotes the surface water rate and the water usage calculated using the surface water rate. This is a display/recording device that displays and records data such as correction values. The container transport and cleaning means 8 includes a container moving means 8a for moving the weighing container 1 to a predetermined position, and a mounting means 8 for placing the weighing container 1 on the weighing means 5.
b. Sample dumping means 8 for dumping the aggregates that have been measured
c and container cleaning means 8 for cleaning the inside of the measuring container 1.
It is formed by d. Moreover, B ₁ to _{B 4} are electromagnetic valves.

Therefore, in the present invention, the weight of the aggregate S supplied to the measuring container 1 by the sample supplying means 2 and the weight of the water W injected into the measuring container 1 by the water injection means 3 and the water amount control means 4 are determined. A measuring means 5 for automatically measuring the weight is provided, and a calculating means 7 is provided for calculating the surface water percentage of the aggregate based on the measuring data output from the measuring means 5 and the input data input from the data input means 6. By inputting the surface dry specific gravity data of the aggregate S, the shape data of the measuring container 1, etc. in advance, and supplying the aggregate S appropriately, the surface moisture content of the aggregate S can be automatically measured. This makes it possible to perform measurements easily and quickly. Therefore,
By measuring the surface water content for each kneading batch and controlling the concrete mixing control device 11, the strength of concrete can be strictly controlled and maintained.

The operation of measuring surface water content according to the present invention will be described in detail below. Now, when the data input means 6 fills the measuring container 1 with water to a certain water level h (or when the measuring container 1 is filled with water (a constant water level h due to overflow)), the weight of water is calculated.
Input W ₀ as the shape data, and input the surface dry specific gravity data G of the aggregate S whose surface moisture content is to be measured. Next, as shown in FIGS. 2a and 2b, the weight W ₁ of the empty weighing container 1 that has been washed and the weight W ₂ when an appropriate amount of aggregate S is supplied into the weighing container 1 are measured using the measuring means 5. By measuring and subtracting the weight W ₁ from the weight W ₂ , the aggregate S supplied to the weighing container 1 is
Obtain the weight Ws (=W ₂ - W ₁ ) of Next, water W is injected into the measuring container 1 using the water injection means 3, and
The water quantity control means 4 adjusts the water level to a predetermined water level h as shown in Fig. 2c, the weight _W3 is measured by the measuring means 5, and the weight _W1 is subtracted from the weight _W3 . The total weight W ₄ (=W ₃ −W ₁ ) of the aggregate S and the injected water W is obtained. Next, calculate Vd (=Ws/G), which is the weight Ws of aggregate S divided by surface dry specific gravity G, and calculate the weight Vs of water replaced by aggregate S (=Ws+W ₀ - W ₄ ). is calculated, and based on these calculation data, the surface water percentage P is calculated by the following formula. Here, the surface dry specific gravity G of aggregate S is
As stipulated in JIS, this refers to the specific gravity of aggregate S when only the surface of particles of aggregate S such as sand or gravel is dry and the inside of the particle is saturated with water. This refers to water adhering to the surface of the aggregate S particles in the above-mentioned dry state.

P=Vs-Vd/Ws-Vs×100 (%) In the measurement of the surface water percentage P of the present invention,
The specific gravity of water is assumed to be 1, and this surface water ratio P is displayed and recorded as necessary, and is output to the concrete mixing control machine 11 as correction data of the water used. In addition, when using a cylindrical measuring container 1 with the same diameter at the top and bottom, the fourth
As shown in the figure, a water level detection means 13 using ultrasonic waves, for example, is provided, and the relationship between the distance H to the water surface detected by the water level detection means 13 and the weight is determined, and the shape data of the measuring container 1 is calculated. W ₀ may be calculated in the calculation means 7 (W ₀ =f(H)). In this case, since W ₀ is calculated based on the distance H detected by the water level detection means 13, the measuring container 1 from the data input means 6
It is not necessary to input the shape data (W ₀ ), and the amount of water injected into the measuring container 1 may be appropriate (there is no need to set it to a predetermined height h). FIG. 5 shows a flowchart of the main part of the arithmetic processing.

By the way, in the embodiment, water W is injected after the aggregate S is put into the measuring container 1, but
The aggregates S may be added after the water is injected, and a procedure that reduces the number of air bubbles generated between the aggregates S is selected. Note that a stirring means for stirring the aggregate S and water in the measuring container 1 may be provided in order to remove the air bubbles.

(Embodiment) FIGS. 6 to 17 are diagrams showing the configuration and operation of a specific embodiment. The sample supply means 2 includes a supply bin 20 into which the aggregate S to be measured is put, an air cylinder 22 for opening and closing a cover 21 provided at the lower end opening of the supply bin 20, and a rotation shaft 24 of a rotation motor 23. and an arm 25 which is attached to and holds a supply bottle 20, and an appropriate amount of aggregate S is supplied by positioning the supply bottle 20 above the measuring container 1 placed on the measuring means 5. At the same time, the supply bin 20 is moved above the measuring means 5 so that the aggregate S can be put into the supply bin 20. The water injection means 3 is formed by a water supply tank 30, a water injection pump 31, and a water injection nozzle 32. The operation time of the injection pump 31 is set by a timer program of the control device 10, and the amount of water poured into the measuring container 1 is controlled. As shown in FIG. 9a, the water W should be at least a predetermined water level h and should not overflow from the measuring container 1. The water amount control means 4 includes a drainage tank 40 and a water suction pump 4.
1 and a water absorption nozzle 42, the measuring container 1
The water W inside is drawn out and discharged by the water suction pump 41,
The water level is adjusted to the water suction nozzle 42 as shown in FIG. 9b.
The predetermined water level h is set at the tip position of the water. FIG. 10 shows a case where a water flow control means 4a consisting of an ultrasonic level sensor is provided, and when the output of the water flow control means 4a reaches a preset level (when a predetermined water level detection output is obtained), water is injected. By stopping the operation of the means 3, water is poured into the measuring container 1 up to a predetermined water level h. The elevating means 9 is an elevating air cylinder 45
and a fixed platen 46 to which the water injection nozzle 32, the water suction nozzle 42, or the ultrasonic sensor is attached, and the fixed platen 4 is moved by the lifting air cylinder 45.
A predetermined water level h of water W to be injected into the measuring container 1 can be set by raising and lowering the measuring container 6 and setting the lowest end position to a predetermined position. On the other hand, when the supply bottle 20 of the sample supply means 2 is positioned above the measuring container 1 and the aggregate S is to be introduced, the fixed platen 46 is set at the uppermost position. The weighing means 5 is a digital electronic scale, which weighs the weighing container 1 placed on a scale stand and the contents (aggregate S, water W), outputs the weighed value as a digital signal, and calculates the weight. Send to means 7. The calculating means 7 is formed using a microcomputer, performs a predetermined calculation based on the measured value outputted from the measuring means 5 and the input data, and displays the calculated surface water percentage P (%) on the display/recording device 11 and It is sent to the concrete mix control machine 12. Next, as shown in FIGS. 11 and 12, the container moving means 8a of the container transporting and cleaning means 8 includes a transport drive motor 50 and a bearing 52 which is rotated by the drive motor 50 and fixed to a frame 51.
a and 52b, and an arm pin 56a that is screwed onto the feed screw 53 and driven in the direction of arrow B by rotation of the feed screw 53, and protrudes into the measuring container 1 via a slider 55a. a slide guide device consisting of a mover 54 that engages with the guide rods 57a, 57b and sliders 55a, 55b;
Guide groove 5 on which arm pins 56a and 56b slide
9, and the measuring container 1 is made freely movable between the dumping cleaning position (right end) and the measuring position (left end) by the rotation of the drive motor 50. Here, in the embodiment, a drop-in part 60 as shown in FIG. By dropping the arm pins 56a and 56b into the drop-in portion 60, the weighing container 1 is placed on the weighing means 5. Here, slider 55a,
The arm pin engagement hole 61 bored in 55b is the first
As shown in FIG. 2b, the holes are elongated in the vertical direction, and are adapted to engage arm pins 56a and 56b so as to be movable in the vertical direction. Note that since the depressed portion 60 of the guide groove 59 is provided with an inclined portion 60a, when the sliders 55a, 55b are driven to the right, the arm pins 56a, 56b
is pulled up along the slope 60a, and the weighing container 1
is automatically raised. 1st
Figure 4 shows another example of the container mounting means 8b.
The measuring means 5 is lifted up by a push-up air cylinder 62, and the weighing container 1 is placed on the measuring means 5 to be ready for measurement. FIG. 15 shows still another example of the container mounting means 8b, in which a rotating air cylinder 63 is provided on the sliders 55a, 55b.
An engagement lever 64 is provided which is rotated by the arm pins 56a, 56b of the measuring container 1.
The arm pin 56 can be freely engaged with the arm pin 56.
When a, 56b and the engagement lever 64 are disengaged, the measuring container 1 is lowered and placed on the measuring means 5. The sample dumping means 8c is formed of a reversing air cylinder 65 and a dumping tank 66, and the measuring container 1 is placed in a state where the weighing container 1 is in contact with a container abutting portion 65a provided at the tip of the drive shaft of the reversing air cylinder 65. By being conveyed to the right, the weighing container 1 rotates around the arm pins 56a and 56b and falls sideways as shown by the imaginary line in FIG. In this state, the reversing air cylinder 65
When the container abutment part 65a of the measuring container 1 rises, the weighing container 1 enters an inverted state with the opening diagonally downward, and the contents (the sample aggregate S and water W are dumped into the dumping tank 66.The container cleaning means 8d Water tank 67
, a cleaning pump 68 , and a cleaning nozzle 69 , the water in the water tank 67 is transferred to the cleaning pump 68 .
The aggregate S remaining in the weighing container 1 is washed away by sucking it up and spraying it from the cleaning nozzle 69. Note that if the measuring container 1 is held with its opening facing diagonally downward, water droplets will also fall. FIG. 16 shows another example of the container transport and cleaning means 8.
c and container cleaning means 8d are provided on both sides of the measuring means 5, and two measuring containers 1a and 1b are provided. By cleaning the container 1b, the measurement cycle is shortened. In FIG. 17, the sample supply means 2 is arranged on the side of the measuring means 5, and the aggregate S is placed in the measuring container 1.
The supply is carried out on the side of the measuring means 5. FIG. 18 is a flowchart showing the procedure for measuring the surface water percentage P by controlling each means by the control device 10. Now, the measuring container 1 is moved to the dumping and cleaning position, and the measuring container 1 is turned over. While dumping the aggregate S and water W in the measuring container 1,
The weighing container 1 is cleaned, and the weighing container 1 is turned over and kept stationary in a standby state. next,
When measuring the surface water percentage P, the measuring container 1 is moved and placed on the measuring means 5, aggregate S is supplied into the measuring container 1, water W is injected, and the weight W at each point is measured. ₁ to _W3 are measured by the measuring means 5, the measured data is input to the calculating means 7, and the calculating means 7 calculates the surface water percentage P.

〔Effect of the invention〕

As described above, the present invention includes a sample supply means for supplying an appropriate amount of aggregate, which is a sample to be measured whose surface water percentage is to be measured, into a measuring container, a water injection means for injecting water into the measuring container, and a water injection means for injecting water into the measuring container. A water amount control means for controlling the amount of water injected, a measuring means for automatically measuring the weight of the aggregate supplied to the measuring container and the injected water, and data for pre-inputting data such as surface dry specific gravity data of the aggregate. It is equipped with an input means and a calculation means consisting of a microcomputer that calculates the surface water percentage of the aggregate based on the measurement data output from the measurement means and the input data input from the data input means, and the calculation means consists of a microcomputer that calculates the surface water content of the aggregate based on the measurement data output from the measurement means and the input data input from the data input means. After inputting the weight of water W ₀ when filled with water up to
Pour water into the measuring container to a certain level, measure its total weight _W4 , divide the aggregate weight Ws by the surface dry specific gravity G to calculate Vd, and calculate the amount of water replaced by the aggregate. The calculation means is configured to calculate the weight Vs (=Ws + W ₀ - W ₄ ) of the measuring vessel and calculate the surface water percentage P as P = Vs - Vd / Ws - Vs × 100 (%). By inputting the shape data and surface dry specific gravity data of the aggregate in advance and supplying the aggregate as the measurement sample appropriately, the surface water content of the aggregate can be automatically measured, making it easy to measure the surface water content. With the device of the present invention, it is possible to measure the surface water content of the aggregate for each batch of concrete and adjust the amount of water used to the optimum level, allowing for strict control of strength. , can be held. Furthermore, in the present invention, a microcomputer is used as the calculation means for automatically measuring the surface water percentage, and each means is sequence-controlled so that the surface water percentage can be automatically measured using a predetermined measurement method. Therefore, the surface moisture content can be easily and quickly measured online simply by supplying the surface dry specific gravity data of the aggregate in advance.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a configuration example of the present invention, FIGS. 2 and 3 are explanatory diagrams of the same operation as above, FIGS. 4 and 5 are diagrams showing other configuration examples and operations, and FIG. The figure shows the overall configuration of one embodiment of the same as the above, and FIGS. 7 to 18 are diagrams showing the specific structure and operation of the main parts of the same. 1 is a measuring container, 2 is a sample supply means, 3 is a water injection means, 4 is a water amount control means, 5 is a measuring means, 6 is a data input means, and 7 is a calculation means.

Claims (1)

[Scope of Claims] 1. A sample supply means for supplying an appropriate amount of aggregate, which is a sample to be measured whose surface water percentage is to be measured, into a measuring container, a water injection means for injecting water into the measuring container, and a water injection means for injecting water into the measuring container. a water amount control means for controlling the amount of water poured into the measuring container; a measuring means for automatically measuring the weight of the aggregate supplied to the measuring container and the water injected; and a data input means for inputting data such as surface dry specific gravity data of the aggregate in advance. and calculation means consisting of a microcomputer that calculates the surface water percentage of the aggregate based on the measurement data output from the measurement means and the input data input from the data input means, Input the weight W ₀ of water when water is added as the shape data, measure the weight Ws of the aggregate supplied to the measuring container, then pour water into the measuring container to a certain water level, and the total weight W Measure ₄ ,
Calculate Vd by dividing the weight Ws of the aggregate by the surface dry specific gravity G, and calculate the weight Vs (= Ws + W ₀ − W ₄ ) of water replaced by the aggregate, and calculate the surface water percentage P by P An apparatus for measuring surface water percentage of aggregate, characterized in that a calculating means is formed to calculate as =Vs-Vd/Ws-Vs×100(%).