Automatic needle discharge type multi-sample gas-liquid sampler based on negative pressure sampling method

Abstract

The invention relates to an automatic needle discharge type multi-sample gas-liquid sampler based on a negative pressure sampling method. The automatic needle discharge type multi-sample gas-liquid sampler comprise a needle-changeable sampler and a sampling container connected with the needle-change sampler, wherein the needle-changeable sampler comprises a first cylindrical cam connected with a first stepping motor, the first cylindrical cam is connected with sampling needles through sliders, the sliders are arranged in a first outer-ring slideway concentric with the first cylindrical cam, a plurality of slide grooves allowing the sliders to move are formed in the first outer-ring slideway, one slider connected with the corresponding sampling needle is arranged in each slide groove, an end cover mounted on the end face of the first outer-ring slideway, and a reset spring is arranged between each slider and the end cover; sampling needle grooves are formed in the first outer-ring slideway, and needle discharge holes are formed in the end cover; the structure of the sampling container is identical with that of the needle-changeable sampler, only the sampling needles are replaced by puncture needles, and the puncture needles are connected with the sampling needles through pipelines. The automatic needle discharge type multi-sample gas-liquid sampler can sample multiple samples in one sampling operation and is simple to operate.

Description

technical field [0001] The invention belongs to the field of automatic detection, in particular to an automatic needle-out multi-sample gas-liquid sampler based on a negative pressure sampling method. Background technique [0002] In some automatic detection occasions, especially in the field of intelligent sampling robots, in order to ensure the scientific validity of the samples taken, it is necessary to perform multi-point sampling on the sampling population, and at the same time ensure that each sample has no cross-contamination. At present, most of the gas and liquid sampling methods commonly used can be classified as negative pressure methods. That is to say, the sampler is inserted into the sampled fluid, and the negative pressure generating device generates a low pressure inside the sampler, and the fluid is pressed into the sampler by atmospheric pressure to complete the sampling. The arrangement of the negative pressure generating device makes the structure of a s...

AI Technical Summary

Problems solved by technology

The setting of the negative pressure generating device makes the structure of a single sampler complicated

Commonly used gas and liquid samplers can only collect a single sample, but when multi-point sampling is performed, a set of samplers needs to be replaced every time a sample is collected, resulting in low efficiency

Especially in the field of automatic sampling, cumbersome and inefficient repeated replacement operations also violate the principle of reducing human operations in automated systems

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