SU114138A1 - Screw feeder for high-pressure hydraulic transport of coal - Google Patents

Description

Screw feeders for high-pressure hydrotransport of coal of natural moisture are known.

The described screw feeder is characterized by the use of a screw with constant parameters of screw chambers along its entire length and creation by means of counterpressure of water during operation of the coal plug between the free end of the screw and the point of water supply to the pipeline to prevent water leakage.

This embodiment of the screw feeder provides a constant volume of coal transported inside the case.

The drawing shows a screw feeder in two projections.

The screw feeder consists of a pipe case with a feed funnel 2 in which the screw 5 is located. The auger is driven by the electric motor 4 through the gearbox 5. Coal enters the feed funnel, is captured by the screw and is pushed into the nozzle that is the beginning of the bypass device 6 consisting of three valves 7, 8 and 9 with actuators. In the nozzle erodes the coal and its further movement through the pipeline 10 with the help of water supplied under high pressure through the pipeline //.

Instead of a washed out portion of the coal, a new batch is fed and the process is repeated.

The coal transported inside the feed case maintains a constant volume through the use of an auger with constant parameters of screw chambers along its entire length.

The coal plug formed between the cut of the screw and the nozzle under the influence of the backpressure of water prevents the infiltration and leakage of water from the discharge pipe II when the supply of coal to the feeder is blocked. During normal operation of the feeder, the coal plug is pushed by the coal coming from the auger to the discharge nozzle, where it is eroded.

No. 114138-2 -

In order to obtain optimal traffic jams when transporting various grades, the coal feeder is equipped with nozzles of various types.

During normal coal feed to pipeline 10, the valve 7 is closed and the valves 8 9 are open; the water path in this case is shown by solid arrows. When the supply to the feeder is stopped, the valve 7 opens and the valves 8 and 9 close; The path of the water is indicated by dotted arrows.

Subject invention

Claims (2)

1. Screw feeder for high-pressure hydrotransport of coal of natural moisture, characterized in that. in order to provide a constant volume of coal transported inside the housing, it uses a screw with constant parameters of screw chambers along its entire length. 2. A screw feeder according to claim 1, characterized in that, in order to prevent water leaks, a coal plug is created between the free end of the screw and the point of water supply to the pipeline by means of the counterpressure of water during operation.