SU138849A1 - Concrete aggregate dispenser - Google Patents

Description

Concrete aggregate dispensers are known with regard to their humidity, including a feeder, devices for continuously measuring the weight and humidity of aggregates, and a system for automatically compensating for variable humidity. However, these dispensers do not provide sufficient stabilization of the quality of the concrete mix with variable humidity components.

The proposed dispenser allows a steady dosage to be applied to a given formulation, regardless of the change in moisture of the materials being metered.

The essence of the invention is that the dispenser is made in a single unit that performs these measurements simultaneously.

In addition, an electronic mixing device can be included in the system for automatic compensation of variable humidity, which allows for controlling the flow rate of water and filler using input signals.

Considering the weight filler dispenser is shown schematically in the drawing. It is an automatic control system consisting of a control object - feeder /; measuring devices - weight sensors 2 and humidity 3; mixing device 4 - amplifier with two independent inputs with adjustable input signals and a common output of amplifying devices 5 - power amplifiers.

The proposed concept allows for a range of design solutions based on its use for various production conditions.

As a working body, the regulator can be applied to the nodes of the existing continuous dispensers vibrating feeders, belt feeders with tape speed control, screw feeders with variable rotation speed of the screw shaft. It is possible to use the weight of the material to be measured.

No. 138849-2 for the existing mechanical systems of continuous injection systems, as well as tensometric, magnetoelastic systems; To measure moisture, it is proposed to use the known effect of slowing neutrocyne fast water molecules. In this case, the measuring device consists of a fast-neutron emitter, made in the form of a strip, installed above the material flow on the feeder; two counters of slow neutrons (one of which is installed under the material flow, and the other at an appropriate distance from the radiator outside the layer of the material being monitored) and the differential specific amplifying circuit, whose arms include counters. The entire measuring device is shielded with lead sheet. Due to the independence of the conversion of fast neutrons to slow ones from the state of aggregation and the spatial arrangement of water molecules, the specified measuring device can control the moisture content of the sand during the dosing process, which has a variable compaction.

The signals received from the weight and humidity sensors are fed to the inputs of the preamplifier - mixer. Pre-amplification can be provided by using semiconductors using electronic or ion devices, as well as varicades and magnetic amplifiers. The potentiometers connected at the inputs of the amplifier are designed to control the magnitude of the signals in order to ensure the required proportionality. The signals are shifted either in lamps with two control grids or through an interstage transformer with two input windings.

Amplification of the signal to obtain the power required for control can be used any existing amplifiers: on ion devices, electronic magnets, and others.

Subject invention

1. A batcher of aggregates of concrete with regard to their humidity, including a feeder, devices for continuously measuring the weight and humidity of aggregates, and a system for automatically compensating for variable humidity, characterized in that, to stabilize the quality of the concrete mix, a device for measuring the weight and humidity of aggregates in a single unit making these measurements simultaneously.

2. Dispenser by. 1, characterized in that an electronic mixing device is included in the automatic variable-humidity compensation system, which allows, by means of input signals, to regulate the flow of water and aggregate brought to a dry state.