SU1763203A1 - Method of control over concrete mixture consistency in the process of its preparation - Google Patents

Abstract

Use: preparation of concrete mix in the factories of the construction industry. SUMMARY OF THE INVENTION: The method for controlling the consistency of a concrete mix during the preparation process includes measuring the consistency of the mixture after the first dose of water is supplied, taking into account the maximum moisture content of the aggregates; mixture and the possible maximum error Dosing of components in the direction of reduction, with deviation from the task of the consistency of the concrete mix after adding swarm water dose third dose is determined by the adjusted value and the second dose of water calculated using the calibration according to 1 m3 of concrete mixture the second and third doses water. 2 Il. and C

Description

The invention relates to the field of automation of the management of the process of preparing a concrete mix and can be used in construction industry plants.

There is a known method of controlling the consistency of a concrete mixture by continuously supplying water to the mixer through coarse and accurate metering channels during the mixing process until the power consumed by the mixer motor is of a predetermined value. The disadvantage of this method is low accuracy of mobility control, since the regulation is carried out in the unsteady mode of mixing, when the properties of the concrete mixture throughout the volume of the mixer are not established, and it is still impossible to judge by the power consumed by the electric motor

the true value of the mobility of the concrete mix. In addition, the value of the control signal of the motor power is significantly affected by the condition of the bearings and the mixer gearbox, the volume of the mixture, and the properties of the components of the concrete mix.

Closest to the present invention is a method for controlling the consistency of a concrete mix, which includes measuring the consistency of the mixture after the first dose of water is supplied, taking into account the maximum moisture content of the aggregates, comparing with the target and calculating the second dose of water according to the calibration dependence. Topping up the water in the proposed method is performed according to the table values of the doses of water necessary to achieve a given consistency.

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for a fixed volume of the mixture. Dosing errors arising from the imperfection of the dosing equipment are not taken into account when setting the final dose of water, which leads to a decrease in the accuracy of adjusting the consistency of the concrete mix.

The aim of the invention is to increase the accuracy of the adjustment.

In order to achieve this goal, in a known method of controlling the consistency of a concrete mix in the preparation process, including measuring the consistency of the mixture after the first dose of water is supplied, taking into account the maximum moisture content of aggregates, the second dose of water calculated by the tar dependence depends on the specified moisture content taking into account the volume of the concrete mix and the possible maximum error in dosing the components in the direction of decreasing and with a deviation from the given The consistencies of the concrete mix after adding a second dose of water determine the third dose by the formula

PL2 GPO

m

moa

adjusted second dose

where is the water;

then - the third dose of water calculated by calibration based on 1 m3 of concrete mix;

GTU2 is calculated according to the calibration dependence for 1 m3 of the concrete mix and the second dose of water.

FIG. 1 shows the calibration dependence of the required amount of water for 1 m3 of concrete mix depending on the required consistency; in fig. 2 - dependency graph.

The method is implemented as follows.

The concrete mixers are loaded into the concrete mixer and the first dose of water mi is poured, based on the highest intrinsic moisture of the aggregates. The concrete mix is stirred until a uniform state is reached and its consistency d is measured. If the Ci 5 value: Sz mixing is stopped and the concrete mix is discharged from the concrete mixer, If Ci Cz, then by the measured Ci consistency value and the Cz consistency value specified by the recipe, a second dose of water is added, taking into account the volume of the concrete mix and possible maximum metering error to the side decrease. This dose can be determined as follows:

five

0

five

0

five

at once. According to the calibration dependence in FIG. 1, determine the dose of water required for 1 m of the concrete mix, as the difference of the ordinates of the points of the plot with the abscissas Cs and Ci, respectively. The value is determined by the formula

ma mis Vmin,

where Vmin is the volume of the concrete mix, taking into account the possible maximum metering error in the direction of decreasing. Concrete mix continue to mix. The consistency of the concrete mixture Ca is measured. If the condition Ca C 3 is fulfilled, the mixing is stopped, the concrete mixture is discharged from the concrete mixer. If the actual mixing volume is V Vmin, then the second dose of water is not enough to reach the consistency value Cz with the concrete mix. The actual measured batch volume is determined from the second measured Ca consistency value.

y-GS2

moa

where moa is calculated by the calibration dependence in FIG. 1 second dose of water, required per 1 m3 of concrete mixture to achieve the value of the consistency of Ca with the measured value of the consistency Ci (moa are on the schedule in Fig. 1).

Then a third dose of water, necessary to achieve the prescription consistency Cz, is defined as the mass of water that is needed for 1 m3 of concrete mix, multiplied by the actual volume of mixing that

t then v

t oa

0

five

0

five

where is calculated by the calibration dependence in FIG. 1 to 1 m3 of concrete mix third dose of water.

Improving the accuracy of adjusting the consistency of the concrete mixture is achieved by the fact that the appointment of a third dose of water according to the consistency measured after the first and second doses of water are supplied eliminates the inaccuracy of regulation arising from the metering errors of the components.

Claims (1)

Claims The method of controlling the consistency of a concrete mix in the preparation process, including measuring the consistency of the mixture after the first dose of water is supplied, taking into account the maximum moisture content of the aggregates, comparing with the target and calculating the second dose of water according to the calibration dependence, characterized in that the calibration dependence of the second dose of water adjusted for the volume the concrete mix and the possible maximum error in dosing the components in the direction of decreasing and when deviating the consistency of the concrete mix from one time to another, gp2 - the adjusted second dose of water; This is calculated one third according to the calibration dependence per 1 m of the concrete mix. barely adding a second dose of water; determine 5 doses of water; The third dose is calculated according to the formula 2 — the second dose of water calculated from the correcting dependence on 1 m of the concrete mix. m GP2 GPR GO02 sho2 - calculated according to the calibration dependence per 1 m of the concrete mix, the second dose of water. but 1