SU1585056A1 - Automatic installation for producing suspensions from lump material - Google Patents

Abstract

The invention relates to equipment for the preparation of suspensions and is intended for the preparation of clay suspensions used in foundries. The purpose of the invention is to stabilize the density of the suspension. The installation includes a bunker 1 for lump bentonite, water dispensers 2 and bentonite 3, a crusher 4, a sludge separator 5, a holding tank 6 with a submersible pump 7 and a discharge pipe 8. The unit is equipped with a slurry dilution unit 9 made in the form of a tank 10 mounted on a scale 11 and having an overflow tray 12. The pressure pipe 8 is lowered into the lower part of the tank 10, the conical bottom of which is connected via valve 15 and the drain pipe 16 to the homogenizer 17, which is a tank-reactor 18 with a hydrodynamic apparatus 19. Of Water ozator 14 in the tank 10 is poured a portion of water, after which, via a pressure pipeline 8, a suspension of increased density is supplied to the lower part of the tank 10 from the storage tank 6. At the same time, the liquid level in the tank rises and the excess of it is drained over the overflow tray 12. The suspension is poured until the tank reaches 10 a weight corresponding to obtaining a given density at a constant volume of the tank 10, then, following a command from the balance 11, into the control unit 23, feed the suspension is terminated and the resulting mixture enters the homogenizer and then into the drain tank 21 for the finished product. The process is automated using control unit 23. 1 il.

Description

The invention relates to equipment for the preparation of a slurry and can be used in the foundry industry to produce clay slurries used in molding sands.

The purpose of the invention is to stabilize the density of the suspension.

The drawing shows schematically an automatic installation for obtaining a suspension from a clod material, a general view.

The installation includes a bunker 1 for lump bentonite, a bentonite dispenser 2, a water dispenser 3, a crusher 4, a sludge separator 5, a holding tank 6 with a submersible pump 7 and a pressure pipe 8 connecting the holding tank 6 to the slurry dilution unit 9. Node 9 dilution

It is made in the form of a tank 10 installed on the scales 11 and provided with an overflow tray 12. The discharge pipe 8 is lowered into the lower part of the tank 10, which is connected to the water tank 14 by means of a pipe line 13. The conical bottom of the tank 10 is connected via valve 15 to the drain pipe 16 to the homogenizer 17, which is a reactor tank 18, in which the hydrodynamic apparatus 19 is installed and which through the valve 20 communicates with the drain tank 21 equipped with a drain valve 22. connected to control unit 23. The water supply to the water metering device 14 is made through the valve 24,

The installation works as follows.

The lump bentonite is loaded through the grate into the hopper 1 and the dispenser 2 is fed to the crusher 49 where the water dispenser 3 is simultaneously supplied with water in a ratio that provides a suspension with a density much higher than the process values, for example, 1, 1 1.3 g / cm3. The prepared slurry through the sludge separator 5 is discharged into a storage tank 6,

To obtain a suspension of a given density with an error tO, 005 g / cm3, a measured dose of water is poured into the reservoir 10 of the node 9 through the valve 13. After the water dispenser 14 is emptied, the valve 13 is closed in the control unit 23, the valve 13 is closed, and the valve 24 opens and at the same time, the pump 7 is turned on, with which a suspension of increased density from storage tank 6 is poured into the tank 10 through the pressure pipeline 8. Due to the higher density, the suspension accumulates at the bottom of the tank 10, while the liquid level The balloon 10 rises. Having reached the overflow tray 12, the liquid level in the tank 10 is stabilized and a constant volume of liquid in it is provided, and the average density of the mixture will increase due to the supply of new portions of the suspension from the storage tank 6 and the displacement of water through the overflow tray. When the reservoir reaches 10 weights corresponding to obtaining a given density at a constant volume of liquid

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in it, the switch in the dial scale indicator 11 is triggered, at the command of which the pump 7 is turned off using contactors located in the control unit 23, the tap 15 is opened with the valve 20 closed, and the first time relay is started at the same time, which guarantees emptying tank 10, closes the valve 15, after which the set of portions of the mixture in the tank 10 is repeated. Closing the valve 15 is a command to start the second time relay in the control unit 23 and turn on the hydrodynamic apparatus 19, homogenizing the mixture in the tank-reactor 18. After a predetermined time interval (5-10 min), the second one, the time relay turns off the apparatus 19, opens valve 20 to discharge the suspension into the drain tank 21 and starts the third time relay, which, after a calculated interval (3-5 minutes), which guarantees emptying of the reactor tank 18, closes the valve 20.

The proposed installation allows even after sludge separation to obtain a suspension with high accuracy in density, which makes it possible to use it in the foundry industry for the preparation of molding compounds with a low scrap rate.

Compared with the known devices operating on powder bentonite, the proposed installation is additional, due to the elimination of drying and grinding of bentonite, reduces the energy consumption and laboriousness of the process of obtaining a suspension, reduces the loss of bentonite and improves sanitary and hygienic working conditions.

Claims (1)

Formula An automatic installation for obtaining a suspension from a lumpy material, containing a bunker, bentonite and water weighing units, a crusher, a holding tank, a filter, a homogenizer and a drain tank, which is equipped with a reservoir dilution unit to stabilize the density of the suspension with a tapered bottom and an overflow pipe mounted on a weighing platform, located between the storage tank515850566 a joint and a homogenizer, both connected and installed after the crusher, and made with pipelines, and a filter in the form of a separator.    J yes ff G / /,  kCx g