Pre-trap for dust sampling

Abstract

The invention discloses a pre-trap for dust sampling and relates to air detection equipment. The pre-trap comprises a shell, a cylinder and a motor, wherein a cavity is formed inside the shell, and only an upper opening is formed in the shell; a plurality of air holes are formed in the bottom of the shell; the cylinder is arranged in the cavity in the shell and only has an opening; the upper opening of the shell is coincided with the opening of the cylinder; a plurality of small holes are formed in the bottom of the cylinder; a filtering net is distributed on the inner wall of the cylinder; the motor is fixed in the cavity in the shell; a primary gear is connected to the output end of the motor; a secondary gear is arranged on the cylinder in a sleeving manner; the cylinder is arranged onthe inner wall of the shell through a rotating shaft; the primary gear is meshed with the secondary gear with each other; and when the motor is started, the cylinder rotates around the rotating shaft,and then dust dropping to the bottom of the cylinder is thrown to the side wall of the cylinder by virtue of centrifugal force, so that the filtering net at the bottom of the cylinder is difficultlyblocked, and air flux in the cylinder is not decreased after long-term operation. Therefore, the dust sampling result is objective and accurate.

Description

technical field [0001] The invention relates to air detection equipment, in particular to a pre-collector for dust sampling. Background technique [0002] Dust sampler refers to a portable device for collecting dust samples in dusty air. It is widely used in disease prevention, environmental monitoring, labor protection, safety supervision, military, scientific research and teaching, metallurgy, petrochemical, railway, building materials and other departments. Hygienic monitoring and evaluation, specially used to determine the average concentration of dust in the air in the workplace of production teams. In the dust sampler, the pre-collector is a separation device of the dust sampler, which is used to collect dust and conduct relevant data analysis on the dust collected through the internal filter of the pre-collector. However, during the working process of the pre-collector in the current dust sampler, the dust collected by the filter screen in the pre-collector is easy t...

AI Technical Summary

Problems solved by technology

However, during the working process of the pre-collector in the current dust sampler, the dust collected by the filter screen in the pre-collector is easy to accumulate on the filter screen, which will cause the filter screen to be blocked, and then the air in the pre-collector will Insufficient flux, the final dust sampling results are not objective and accurate enough

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