Automatic sample injection device

Abstract

The invention relates to an automatic sample injection device, which comprises a reagent cistern used for storing reagent to be reacted, a sample cistern connected with a water extracting device and used for storing sample solutions, a sample mixing cistern used for caching the reagent to be reacted and the sample solution which are prepared according to a certain proportion, an extracting device which extracts the reagent to be reacted and the sample solution respectively to the sample mixing cistern, and an automatic sample injection control unit used for controlling the extracting device, wherein the extracting device comprises a first peristaltic pump used for extracting the reagent to be reacted in the reagent cistern, a second peristaltic pump used for extracting the sample solution in the sample cistern, and an injection pump connected with the sample mixing cistern, the injection pump realizes the discharge of the liquid in the sample mixing cistern by being pushed back and forth in the sample mixing cistern, the sample mixing cistern and / or the injection pump are / is provided with approach detection modules used for detecting the distance between the sample mixing cistern and the injection pump, and the approach detection modules are connected with the automatic sample injection control unit. The invention has accurate and reliable sample discharge results, and the operation is relatively simple.

Description

technical field [0001] The invention relates to an automatic sampling device, in particular to an automatic sampling device for water samples and reagents used for on-line automatic detection of trace chemical elements in water bodies. Background technique [0002] In order to facilitate routine monitoring in marine biogeochemical research, researchers have gradually transferred the analysis of chemical elements in seawater from the laboratory to the field. The injection method of reagents and reagents is manual injection, and the sample mixing reaction process and reaction time are artificially controlled. This method requires the intervention of staff and is not suitable for on-line analysis of on-site chemical elements. For the on-site online measuring instrument, all the sampling and mixing reaction processes must be completed automatically without human participation. The automatic sampling and mixing reaction process realizes automation while accurately controlling the...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned automatic sampling system, when it is necessary to discharge the liquid in the sample mixing device, it is realized by matching the speed of the stepping motor with the time. The requirements are very strict. If the speed and time parameters are not matched properly, the liquid in the sample mixing device may not be drained completely, or the sample mixing device may be damaged, which poses a great safety hazard in field applications.

Images