SU456260A1 - Apparatus for automatically controlling the process of preparing a mixture of lightweight concrete - Google Patents

Description

one

The invention relates to the field of instrumentation in the production of concrete based on porous coarse aggregate, porous sand and quartz sand.

A device for automatic control of the process of preparing a mixture of lightweight concrete is known, comprising dispensers of coarse, fine, light and fine heavy components with volume capacity sensors and bulk bulk density of components, the outputs of which are connected to analog multiplying units, spacers and weight controllers for the mixture and volume of fine mixtures. components, servomotors drives dosing of small components

The aim of the invention is to obtain a lightweight constant volume constant of a given structure.

This is achieved (that is, that of analog multiplication) —oedic Khvy weight regulator of the mixture with a servomotor drive of a small heavy component dispenser, and the outputs of volume sensors | Groomer (, n (1) of small components - juz rpul to;) we wash away small komgkii-ity with servomotor drive dispenser me.dkogo lightweight component.

The invention is illustrated in the drawing. The device contains the dispensers of coarse 1, small lung 2 and small heavy 3

components, sensors 4–6 of volumetric capacity of metering devices, sensors 7–9 of bulk bulk density of components, blocks of analogous multiplication 10–12, unit. 13 masses of weight, setting device 14 of the mixture of small components, regulator of 15 of the mixture weight, Hi controller of the volume of the mixture of small components, magppt) starters 17, 18 and servomotors 19, 20 other codes up to. Ator melki.ch components

Introduce the notation:

Gf. the total weight of the mixture komionenuv;

YII - bulk nipipna m; kch-; | large) component;

YM - bulk bulk Mjv4-a finely (H)) light component;

Yi is the bulk density of the fine heavy component;

VK is the volume of a large component;

VM is the volume of the small lung component;);

VT is the volume of a small heavy component; - bulk bulk weight of the mixture is full;

The F-factor of the intestinal mix, which is calculated from the structural factor (oi of the volume of the components to the sum of the volumes of the small and large components) and is given by the unit of the volume of the mixture of the small components.

You can write:

 - (K-UK + Tm-UM + b-UT ./-(Ch

- nn + + v,)

To satisfy equality (1), two conditions are necessary:

G, -; - to I / K + Ti VM + Tt VT const; (2)

CC + K + t -: const. (3)

1-If the Const CC, then it is sufficient to fulfill the condition:

1 / „+ I /, city /,„ const, (4)

I de FCM - the total volume of the mixture of small components.

Having solved equation (2), where the variables are CC, YM and 7m, and the function is Um, we substitute the found FT in (4) and find the UMUs Us «Ug.

The values of GC and USM are specified and entered using the setting units 13 and 14. Since there are always a constant amount of materials on the metering tapes -3, the signals of the sensors 7-9 are essentially the signals of the bulk bulk density of the components. On analog multiplication blocks 10-12, the signals from sensors 4-6 of volumetric capacity are multiplied by signals from sensors 7-9. Signals of works

1k-Uk, TM-I / M. .

derived from the outputs of the multipliers are added to the output of the weight regulator 15

and compared with the setpoint 13 signal. The signal from the regulator output through the magnetic starter 17 controls the servomotor 20 of the metering drive of the small heavy component. The signals of the volumetric capacity sensors 5, 6 dispensers of small components are included at the input of the controller 16 for the volume of small components. The signal from the output of the regulator through the magnetic starter 18 controls the servomotor 19 of the drive of the dispenser 2 of a small light component.

Subject invention

Apparatus for automatically controlling the process of preparing a mixture of lightweight concrete containing dispensers of coarse, fine light and fine heavy components

with volumetric capacity sensors and volumetric bulk density of components, the outputs of which are connected to analog multiplication blocks, setting devices and weight controllers for the mixture and the volume of the mixture of small components, servo motors of small component metering drives, characterized in that, in order to obtain lightweight concrete, a constant volume weight of a given structure, the outputs of the analog multiplication units are connected via a weight regulator of the mixture with the servomotor of the metering drive of a fine heavy component, and the outputs of the volume sensors are clusive small components - through the regulator volume mixture of small components

the servomotor of the drive of the doser

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