SU1399133A1 - Apparatus for preparing lime-sand moulding composition - Google Patents

Abstract

The invention relates to the production of building materials, in particular products from a lime-sand mixture, for example, silica brick, can be used in the mixture preparation departments of a foundry and can improve the quality of the mixture preparation. The device contains a mixer 1 with feed 2 and unloading 3 conveyors with humidity sensors 4 and 5 installed on them, respectively, adders 6 and 7, setting devices 8 and 9, threshold element 10, logic gate 11, actuators 12, 13 and 14, controllers 15 and 16, the actuator 17 of the water supply regulator, the water dispenser 18 with valves 19 and 20, respectively, fpyfioro and accurate dosing, the mixture control unit 21 mounted on the feed conveyor, the shut-off valve 22 which is installed at the outlet of the water dispenser 18, drive electric motor 23 feed conveyor 2, the drive of the electric motor 24 of the mixer 1 and the drive of the electric motor 25 of the discharge conveyor 3. 1 sludge. cl

Description

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The invention relates to the production of building materials, in particular, products from a sand and sand mixture, for example silicate brick, and may also find application in the mixing and preparation departments of the foundry industry.

The purpose of the invention is to improve the quality of the preparation of the mixture.

The drawing shows a block diagram of a device for preparing a lime sand mixture.

The device contains a mixer 1 with feed 2 and discharge 3 conveyors with humidity sensors 4 and 5 installed on them, respectively, adders 6 and 7, setting devices 8 and 9, threshold element 10, logic element 11, starters 12 - 1А, regulator the tori 15 and 16, the actuator 17 of the water supply regulator, the water dispenser 18 with valves 19 and 20, coarse and precise, respectively, metering, the mixture control unit 21 mounted on the feed conveyor, the shut-off valve 22, which is installed at the outlet of the water dispenser 18, motor drive 2 3 feed conveyor 2, when the water of the electric motor 24 of the mixer I and the drive of the electric motor 25 of the discharge conveyor 3.

The device works as follows

The molding mixture, the humidity of which is 2-7% from the reactor (not shown) using feed conveyor 2 enters mixer 1, is humidified to 8-10% depending on the commands

setting devices 8.9 and using the discharge conveyor 3 is fed further to the pressing. Signals of humidity sensors (for example, type of infrared moisture meter) and setting device 8 are fed to the adder 6. The resulting signal goes to the controller 15, From the output of the controller 15, the signal goes to the starter 12 , from the output of which - to the valve 19, Regulation occurs according to the proportional-integral law.

At the same time, the signal from the humidity sensor 5 is fed to the adder 7, where it is summed with the signal of the setting device 9, the resulting signal simultaneously arrives at the element 11 and the controller 16, from the output of which - through the guskatel - at the valve 20 exactly

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dosing. The input element II is connected to the output of the threshold element 10, the input of which is connected to the humidity sensor A. If humidity pos. tapering molding mixture is less than 6% (depending on the setpoint of the threshold element 10, then from the output of the threshold element 10, the signal goes to the AND 1I element, from the output of which to the starter 13, then the signal goes to the coarse metering valve 19. If the humidity of the incoming molding sand equal to or greater than 6%, the signal from the output of the threshold device 10 is missing and the coarse dispensing valve 19 is turned off,

The mixture presence control unit 21, for example, the UKS 1 consists of a mixture presence sensor and a control unit, detects the operation of the shut-off valve 22 n of the electric motors 23-25. In the absence of a molding mixture, the water supply is shut off by the shut-off valve 22, the electric drives of the feed conveyor 2 are turned off, the mixer 1 and discharge conveyor 3,

Thus, the device provides an increase in the yield of high-quality blend by reducing the time and increasing the accuracy of the device self-tuning to ensure the required water flow when the humidity of the molding mixture at the inlet of the mixer varies by 2-7%,

The humidity of the molding mixture is controlled taking into account the humidity of the molding mixture at the loading and unloading of the mixer, and the presence of a control unit for the presence of the mixture, two adders, setters, a threshold element and a logic element And allows you to regulate the flow of water through a common pipeline accurate dosing.

Claims (1)

Invention Formula A device for preparing lime-sand molding mixture containing a mixer with feed and discharge conveyors, an actuator of the water supply unit to be regulated, a first humidity sensor, a threshold element, a first sensor connected to the first inlet of the first adder, characterized by that, in order to improve the quality of the preparation of the mixture. 313 it is equipped with a water metering device with coarse and precise metering valves, a mixture control unit installed on the feed conveyor, a shut-off valve on the water metering outlet, a second humidity sensor mounted on the feed conveyor, three actuators, a logic element I, two regulators and a second an adder with a setting device, the first humidity sensor is installed on the discharge conveyor, the second humidity sensor is connected to the input of the threshold element and the first input of the second adder, the first humidity sensor is the mouth Credited on vnhode from the mixer and connected to second inputs of adders, the second adder output is connected to the input of the first regulator, output 3 which is connected to the first actuator, which is connected to the actuator of the water supply regulator, the output of the first adder is connected to the first input of the element I and the input of the second regulator, the output of which is connected to the second actuator, which is connected to the precision metering valve, the output of the threshold element is connected to the second input of the element I, the output of which is connected to the third starter, which is connected to the coarse metering valve, and the output of the mixture control unit is connected to the drives of electric motors mesitel and discharge conveyor and the drive motor a shut-off valve and feeding EPA.