Method for arranging filter cloth sucking/closing area and filter cloth sucking/closing device on distributing head of filtering machine

Abstract

The invention provides a method for arranging a filter cloth sucking / closing area and a filter cloth sucking / closing device on a distributing head of a filtering machine. A blind area (1), a sucking and drying area (2), an air blowing area (3) and a liquid absorbing area (4) are arranged on the distributing head of the filtering machine; the filter cloth sucking / closing area (5) is arranged between the air blowing area and the liquid absorbing area; the filter cloth sucking / closing device (6) is arranged in the filter cloth sucking / closing area, and can regulate the flow of negative pressure air introduced in the filter cloth sucking / closing area (5). The filter cloth sucking / closing area comprises a three-way pipe, wherein a first passageway in the three-way pipe is communicated with the filter cloth sucking / closing area; a second passageway in the three-way pipe is communicated with the sucking and drying area or the liquid absorbing area; the tail end of a third passageway in the three-way pipe is closed; an adjusting bolt is arranged in the third passageway; the communication condition of the first passageway and the second passageway can be controlled through adjusting the screwed length of the adjusting bolt so as to regulate the flow of the negative pressure air introduced in the filter cloth sucking / closing area; and a filter cloth which has been adsorbed on a filter disc when the filter cloth enters the liquid absorbing area again as the filter disc rotates cannot be scratched by a tank body; therefore, the service life of the filter cloth is improved.

Description

technical field [0001] The invention belongs to the technical field of filters, and in particular relates to a method for setting a filter cloth suction area and a filter cloth suction device on a filter distribution head. Background technique [0002] The filter is mainly used for filtration and dehydration of aluminum hydroxide seed liquid in alumina plant in non-ferrous metal industry, flotation concentrate and coal slime in coal industry, flotation concentrate, tailings and red mud in various mines. [0003] The filter disc of the filter rotates in the filter tank filled with slurry, and the filter disc is wrapped with filter cloth. Through the suction of the vacuum pump, a pressure difference is formed on the rotating filter disc. When the filter disc enters the slurry, it will Entering the liquid suction area, under the action of negative pressure, the liquid is sucked away through the filter disc, and the solid particles in the slurry are blocked by the filter cloth, ...

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Problems solved by technology

[0005] Chinese patent application number 200610152655.6 introduces a distribution head, which adds a transition area between the liquid suction area and the suction dry area of ​​the distribution head, which solves the problem of difficulty in starting the filter

However, when the filter disc enters the blowing area ③, after the compressed air blows the filter cloth on the filter disc, the filter disc rotates into the blind area ①, and the compressed air formed in the blown filter cloth cannot be discharged, and it will rotate with the filter disc. When entering the liquid suction zone ④ again, the blown filter cloth is easy to hang on the filter tank on both sides of the filter disc and be scratched, thus greatly shortening the service life of the filter cloth, affecting production and increasing production costs

At the same time, when entering the negative pressure suction area, the positive pressure gas in the blown filter cloth will consume part of the vacuum, which will affect the production efficiency of the filter.

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