Air pumping valve capable of preventing dust blockage

Abstract

The invention discloses an air pumping valve capable of preventing dust blockage. The air pumping valve capable of preventing the dust blockage comprises a pressing cap, a bolt, a movable rod, an air taking valve body, an ejecting rod and a rotation handle connected with the ejecting rod. The pressing cap is respectively connected with the bolt and the air taking valve, installation threads are arranged at the lower portion of the outer wall of the pressing cap, a bolt is provided with a through hole, the pressing cap is provided with an opening corresponding to the through hole, the movable rod is installed on the through hole and the opening and connected with the ejecting rod, a ventilation gap is arranged between the outer wall of the movable rod and the inner wall of the opening, the movable rod is provided with a flange, a first sealing ring is arranged between the flange and an inner cavity wall of the pressing cap, a spring is installed between the flange and the bolt, a ventilation groove is arranged on the movable rod, an air taking cavity communicated with an air taking pipe is arranged in the air taking valve body, and filter cotton is arranged at the lower end of the through hole. The air pumping valve capable of preventing the dust blockage is simple in structure, can prevent the dust from blocking a ventilation pipe through the filter cotton, enables the filter cotton to drop through the movable rod without damaging vacuum conditions after a sample is ground, and guarantees normal operation of air pumping.

Description

technical field [0001] The invention relates to the technical field of air extraction valves, in particular to an air extraction valve used on a grinding plate of a vacuum sample grinding machine to prevent dust from clogging. Background technique [0002] In shale gas research, it is necessary to grind shale samples under vacuum conditions, and collect the gas released from the samples for qualitative and quantitative analysis. [0003] The existing method for grinding samples is: first put the sample pieces and steel balls into the hollow grinding disc of the vacuum mill; then take out the air in the grinding disc, then rotate the grinding disc, The steel balls in the disk collide with the sample, which grinds the sample and releases gas for collection and analysis. The air valve for extracting the gas from the grinding disc is the key component of the vacuum ball mill. If a conventional stop valve is used, the ground sample powder will block the ventilation pipe or filte...

AI Technical Summary

Problems solved by technology

The air valve for extracting the gas from the grinding disc is the key component of the vacuum ball mill. If a conventional stop valve is used, the ground sample powder will block the ventilation pipe or filter core, so that the air extraction process cannot be carried out.

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