Air bed layer type gravity winnowing machine

Abstract

The invention discloses an air bed layer type gravity winnowing machine which comprises a rack, a suspension device, a shell, a screen body, an air chamber, a gangue discharging hopper, a clean coal discharging pipe and a main air pipe, and a vibration exciter is fixed to the top of the shell. The automatic laser welding system has the advantages that 1, the vibration exciter is arranged at the top of the shell, gangue and clean coal flow reversely and are separated under the combined action of the vibration exciter and the air chamber below the vibration exciter, and the winnowing effect is good and the efficiency is high through separation of the mixing layer; 2, air sent by the main air pipe firstly enters a communicating chamber and then is blown out to the upper part, the middle part and the lower part of the screen body through a middle air outlet pipe and a side air outlet pipe, so that the air quantity and the air pressure reaching each part of the screen body are consistent, the stability and the filling power of a coal bed layer are ensured, and the separation effect is enhanced; and 3, purified air is sent back to the system, the air pressure of the system is recycled, the type selection of an induced draft fan is small, the energy consumption is low, an air blower is omitted, and the equipment size is reduced.

Description

Technical field: [0001] The invention relates to the technical field of wind separation of raw coal, in particular to an air bed type gravity wind separation machine. Background technique: [0002] Dry coal preparation technology has broad application prospects due to its advantages of no water, low cost, and no pollution after dust removal; a wind separator has been developed, which mainly includes high-frequency vibrating screens, blowers, main air pipes and air chambers, and The chamber is located under the high-frequency vibrating screen, the outlet of the blower is connected with the inlet of the main air pipe, and the main air pipe is connected with the air inlet pipes of each air chamber; put the raw coal on the high-frequency vibrating screen, and at the same time, the air sent by the blower passes through the air The chamber will be blown upwards to the top of the sieve body, and the raw coal above the sieve body will be fluffed by continuous air flow, and under the...

AI Technical Summary

Problems solved by technology

The above wind separator has the following problems: 1. The exciter of the high-frequency vibrating screen is arranged on the side, and the gangue and clean coal flow downward during the vibration of the screen body, and the gangue discharge port and the clean coal discharge port are all set at high The side part of the bottom end of the frequency vibrating screen, gangue will be mixed with some clean coal, and the winnowing effect is poor; The incoming wind has a certain pressure, so it blows directly to the facing sieve body before it diffuses in the air chamber, so that the coal on the sieve body around the air inlet pipe cannot reach the bulkiness of the bed in the center of the air chamber, resulting in the coal bed being unstable. Stability and inconsistent fluffiness will eventually lead to poor winnowing effect; after long-term operation, coal backlog will occur on the bed, which will further affect winnowing effect; The fan, and the induced draft fan needs to be selected in a large size, the equipment cost is high, and the pressure of the purified air after dust removal is high, and the direct discharge will cause a waste of wind pressure; while the blower pressurizes the external air and sends it to the air chamber, which consumes a lot of energy. high

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