SU379858A1 - DEVICE FOR REGULATING THE RATIO OF A MIXTURE WITH A GIVEN VOLUME WEIGHT - Google Patents

Description

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The invention relates to the production of lightweight concrete based on porous aggregates, for example, expanded clay, agloporite, slag pumice, etc.

Coarse aggregate of two fractions (10-20 mm and 5-10 mm) and fine aggregate (sand) are usually used to prepare light concrete mixtures. The bulk weight of sand is 2-3 times larger than the bulk weights of the coarse aggregate fractions, which differ slightly from each other.

Devices are known for controlling the mixing ratio, including automatic large and fine aggregate dispensers with units for weight and volume, weight and volume adders for the components of the large aggregate, regulators, amplifiers, and actuators for metering gates.

However, in the known devices, the dosing of aggregates is carried out either by weight or by volume without taking into account changes in the volumetric weight of the components. The variability of the volumetric weight of lightweight aggregates used leads to the variability of the concrete yield factor and the variability index by bulk weight.

The purpose of the invention is to obtain a mixture with a given volumetric weight and an increase in dosing capacity.

This is achieved by the fact that the outputs of the volume aggregator of the coarse aggregate components and the fine aggregate volume sensor are connected to the first controller, which through an amplifier is connected to the actuator mechanism of the small aggregate meter gate, and the outputs of the mass aggregator of the large aggregate component and the small aggregate weight sensor are connected to the second

controller, which through the amplifier is connected to the actuator of the gate of the coarse aggregator dispenser.

The drawing shows a block diagram of a device for controlling the ratio of components of a mixture by the example of expanded clay gravel of two fractions and sand.

Expanded clay gravel of 10-20 mm fraction is in the bunker. The unloading of the bunker is carried out by an automatic dispenser 5

with open control loop.

The position of the metering gate is proportional to the volume of the material to be discharged and monitored by inductive sensor 3, which is a volume sensor. The weight of the material to be discharged is controlled by the inductive weight sensor 4.

The gravel of the 5-10 mm fraction is in the hopper 5 and is discharged by an automatic dispenser 6 with an open control loop. The position of the metering gate, proportional to the volume of the material to be discharged, is monitored by the inductive sensor 7 of the gate position, and the weight by the inductive weight sensor 8. The volume signals of the dosed claydite 5th gravel are folded in the volume adder 9, and the weight signals in the adder 10 of the weight of expanded clay gravel. The sand from the bunker 11 is discharged by an automatic dispenser 12 with an open control loop. The volume of sand discharged is controlled by an inductive sensor 13 of the position of the sand dosing gate, and a weight by an inductive sensor 14 of a sand weight. The total signal of the expanded clay volumes 15 gravel and sand enters the controller 15, which through the amplifier 16 controls the actuator 17 of the sand dosing gate. The required volume of the mixture is set by the volume adjuster 18. The total signal of the weight of expanded clay gravel and sand enters the regulator 19, which through the amplifier 20 controls the actuating mechanisms 21 of the slats of the expanded clay gravity metering units. The required weight 25 of the mixture is set by the weight adjuster 22. To maintain unchanged intergranular voidness of coarse aggregate, specified by technology requirements, its ratio between fractions remains constant during the process of regulation, which is achieved by synchronous control of actuators 21 of gates of dispensers 2 and 6. With a constant bulk density of expanded clay gravel The sand system automatically adjusts the ratio of the complex mixture to equilibrium. If, for example, the bulk weight of expanded clay gravel has increased, then this results in an increase in the Hia signal of the weight accumulator 10. The controller 19 is expanded and through the amplifier 20 turns on the actuators 21 of the valves of the 2 to 6 coarse aggregators. Shibers are raised, increasing the flow area of the dispensers. This causes an increase in the signal 45 of inductive volume sensors associated with the position of the gates. The outputs of these sensors through the volume adder 9 are connected to the input of the volume regulator 15 20, which through the amplifier 16 turns on an executive mechanism 17 of the sand dispenser 12. The gate moves downward, the flow area of the dispenser decreases, and the thickness of the material layer on the dispenser tape decreases. As a result, the weight signal from the sand weight sensor 14 is reduced until the mixture weight regulator 19 is in equilibrium. Then the effect of the regulator 19 on the gates of the dispensers 2 and b is stopped, the signal of the sensor 9 of the total volume of expanded clay gravel ceases to change, and the regulator of the volume 15 of the mixture comes to equilibrium. When the bulk weight of expanded clay gravel is reduced, the ratio of coarse aggregate — sand changes in the direction of increasing the content of sand in a mixture that has a greater bulk density than expanded clay gravel, which leads to maintaining a predetermined volume weight of the complex mixture. The proposed device can be made on the basis of commercially available equipment and instruments. The subject of the invention is a device for adjusting the ratio of a mixture with a given bulk weight, including automatic dosing of coarse and fine aggregates with weight sensors P. volume, weight adders and volume components of coarse aggregate, regulators, amplifiers and actuators of the shiber. dispensers, characterized in that, in order to obtain a mixture with a given volumetric weight and increase dosing performance, the outputs of the volume aggregator of the large aggregate and the small aggregate volume sensor are connected to the first controller, which is connected through an amplifier to the fine aggregate metering gate actuator, the outputs of the adder weight of the components of the coarse spacer and the weight sensor of the fine aggregate are connected to the second controller, which is connected through an amplifier to the executive fur nizm shiber metering large filler.

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