Air particle sampling automatic membrane changing device and sampler equipped with the device

Abstract

The invention discloses an automatic membrane replacing device for air particulate matter sampling and a sampler provided with the device. The automatic membrane replacing device comprises a rack, a filter membrane clamp bin, a filter membrane clamp bin lifting mechanism, a filter membrane clamp rotating mechanism and a membrane pushing mechanism, wherein the filter membrane clamp bin comprises a central shaft; a plurality of filter membrane clamp trays are arranged on the central shaft in a sleeving manner. The filter membrane clamp bin lifting mechanism comprises a linear guide rail and a lifting drive device for enabling the filter membrane clamp bin to move up and down along the linear guide rail. The filter membrane clamp rotating mechanism comprises a rotating drive device for pushing the filter membrane clamp trays to horizontally rotate. A pushing rod motor of the membrane pushing mechanism pushes a pressing plate to move upwards, so that the filter membrane clamp abuts against a gas-flow inlet by virtue of a lower pipe joint. According to the automatic membrane replacing device, the filter membrane clamp bin is small in size and is great in capacity, so that a dozen of filter membranes can be added once, and therefore, long-time sampling needs can be met. Staff is not needed for guarding, so that the labor intensity of an operator is relieved. The lifting mechanism, the rotating mechanism and the membrane pushing mechanism have high positioning precision, so that the reliability is relatively high.

Description

technical field [0001] The invention belongs to air particle sampling technology, in particular to an air particle sampling automatic membrane changing device and a sampler equipped with the device. Background technique [0002] The air particle sampler captures the total suspended particles and inhalable particles in the ambient atmosphere by the filter weighing method, and is used for the routine detection of aerosols. At present, the air particle sampler is mainly staffed on duty, and the filter membrane needs to be replaced manually on site. When continuous long-term sampling or multi-membrane interval sampling is required, it is necessary to regularly go to the sampling site to replace the filter membrane, which brings a lot of repetitive labor to the operator and greatly increases the labor intensity of the operator. For the sampling unit, the on-site duty also increases the input of personnel. Therefore, there is a need for an air particle sampler that can perform r...

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned prior art, although the manual membrane replacement can be replaced by mechanical movement through the multi-degree-of-freedom movement of the mechanical structure, the number of filter membranes accommodated by the sampler is limited by the volume, and currently it can only carry about 7 filter membranes. Difficult to achieve long-term automatic sampling

When the filter membrane is replaced, it is necessary to take the membrane from the filter membrane hole by clamping fingers, transfer it to the sampler, place it in the sampling gas path, take the membrane from the sampling gas path, transfer it back and place it reliably in the filter membrane hole Among them, each filter membrane requires high positioning accuracy in the filter membrane holes, and there are many intermediate steps in the transmission, which requires high positioning accuracy, so the reliability is low

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