Filtering device

Abstract

Provided is a filtering device, which could not reduce the recovery of the heavy proportion object, prevent mid light proportion object from mixing with heavy proportion object. Filtering device has upwelling generating tube (8) making upwelling generate inside the flume (2), and suction catheter (9) sucking mid light proportion object (B) floating undersurface in virtue of upwelling to upper, so the mid light proportion objects (B) of low deposition speed are floated undersurface by the upwelling, and are sucked and dischared to the suction catheter (9), which prevents mixing and depositing into the heavy proportion object (A) of the bottom of the flume (2), and even the heavy proportion objects (A) entering into the suction catheter (9) owing to upwelling, it could not be sucked to the upper by the suction catheter (9) but deposited to outside, without reducing the recovery of the heavy proportion object (A), and preventing mid light proportion object (B) from mixing with heavy proportion object (A).

Description

technical field [0001] The invention relates to a wet type screening device which utilizes the specific gravity difference to screen a mixture in a water tank. Background technique [0002] As a screening device for a mixture using a difference in specific gravity, a wet type screening device that floats and sinks a mixture in a water tank due to a difference in specific gravity is used in various fields. [0003] This kind of wet screening device is used in the following fields, for example, when obtaining sawdust as a raw material for papermaking, from a mixture of heavy objects such as gravel and iron flakes, and separating the heavy objects as foreign objects. Sawdust with a specific gravity greater than 1 can be efficiently recovered, and a conveyor belt (conveyor) is installed in the water tank, and the water in the tank is sucked from the back of the conveyor belt, and supplied to the tank where the heavy specific gravity is deposited. The bottom of the vertical cyli...

AI Technical Summary

Problems solved by technology

[0007] In the above-mentioned waste treatment fields and skeet shooting ranges, etc., when wet screening devices are used to screen heavy specific gravity objects from mixtures, in order to prevent medium and light objects with a specific gravity greater than 1 The specific gravity is mixed in the heavy specific gravity. As the patent document 1 records, the method for considering the adoption is to push back the sinking medium and light specific gravity with the rising water flow, and pick it up by the conveyor belt. The specific gravity may also be picked up by the conveyor belt. Once the heavy specific gravity picked up by the conveyor belt does not return to the water tank, there will be a problem that the recovery rate of the heavy specific gravity will decrease.

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