SU719952A1 - Apparatus for dehydrating granular materials - Google Patents

Description

I

This invention relates to a foundry, in particular, to installations for the wet regeneration of molding sands and the dewatering of bulk materials.

A known device for storing washed sand with a device for removing water using a filter and a rolling roller containing a hopper, in the lower part of which a pumping slide with a filter is installed. The filter consists of fixed, intersecting hygroscopic strands, along which water is led out through the openings of the bottom of the gate to the hygroscopic porous material. As water accumulates from. the porous material is pressed by a roller, which is rolled around the entire perimeter of the bottom of the gate 1.

A disadvantage of the known installation is that the filtering device is gradually silted up and needs to be replaced, which requires disassembling the entire installation, turning it off from the process chain and installing additional backup devices.

The closest in technical essence and the achieved result is a laboratory device for the separation

granular materials from the liquid using a vacuum pump. The device includes a funnel in which the filter and filter cake of a sealed Bunsen flask connected to the vacuum pump are placed, a device for assembling the filter and safety devices placed between the vacuum pump and the Bunsen flask. Filtration occurs due to the difference between atmospheric pressure and pressure in a closed cavity. The filter cake is cleaned with a water jet injection pump 2.

The disadvantages of this device are the need to disassemble it to remove sludge, low productivity and lack of mechanization of unloading operations;

The purpose of the invention is to eliminate these disadvantages and increase the efficiency of the device for dewatering bulk materials.

The goal is achieved by the fact that the funnel with the filter is hinged at the bottom of the bunker, and the spraying sprayers are placed above and below the filter.

The drawing shows a diagram of the device.

A device for dewatering bulk materials contains a buiker 1 into which wet material 2, for example, sand, voriku 3, is fixed at the bottom of the hopper 1 at the hinge 4. Spremers 5 are located inside and outside of the funnel 3 attached to the top of the funnel 3. At the bottom of the funnel 3, an ejector 7 is connected to create a vacuum in the funnel. Pipeline 8 supplies water to the sprayers 5, pipe 9 connects the compressed air to the ejector 7, and pipe 10 leads the filtered water to the tank 11. The valve 12 regulates the air supply, the valve 13 controls the flow of the filter 6 to the sprayers 5, and the valve 14 is intended to drain filtered water. The load 15 suspended on the lever 16 keeps the funnel 3 in the working position. The conveyor 17 transmits the dehydrated material for further processing.

The device works as follows.

Wet material 2, for example sand, is loaded into the hopper 1. Moisture under the influence of gravity gradually concentrates in the lower part of the bunker 1 and, passing through the filter 6, enters vdronku 3. The filtered water, entering the funnel 3, through the valve 14 along the pipeline 10 flows into the tank 11. Before unloading the material 2 from the bunker 1, for removal of the waste water from the 1st zone of the lift pipe, the valve 14 is closed, the valve 12 is opened, and through the pipe 9 the compressed air is supplied to the ejector 7. Compressed air passes through the ejector 7, creates a rarefaction s in the funnel 3, in connection with what is intensified posl EHD step of removing residual water from the material 2. The closing valve 12, compressed air supply is stopped. The funnel 3 is retracted to the rinsing position for the filter b, and the material 2 is discharged from the hopper 1 to the conveyor 17. At the time of the material 2, the valve 13 is opened and water is fed to the sprayers 5 through the pipeline 8 to rinse the filter 6. The flushing is performed

both with and without vacuum in the funnel 3.

The washing and drying process takes place much earlier than the emptying of the hopper 1; therefore, after unloading material 2 and returning the funnel 3 to its original position, bunker 1 is ready to receive the next portion of wet material 2. This reduces the auxiliary time in the overall dewatering cycle.

During the flushing of the filter 6 of the same

o water is periodically washed out; the trunk is removed from which the water is filtered out, thus creating a reliable operation of the entire chain of elements involved in the process of dewatering the material.

Thus, the proposed device allows reducing the time and increasing the efficiency of dewatering wet material by creating a vacuum in the bottom of the bunker, increasing the reliability of drainage and durability of the drainage system elements by periodically washing them during the unloading of the bunker, dewatering materials of various size, eliminate

5 time consuming to replace the filter load. ,

Claims (2)

1. USSR Author's Certificate No. 233527, cl. B 65 G 65/56, 1966. 2. Resurrection P. I. Technique of laboratory work. M., “Himi, 1973, p. 434-453. M AND