Automatic sample feeding device for detecting chemical oxygen demand of water quality

Abstract

The invention relates to an automatic sample feeding device for detecting a chemical oxygen demand of water quality. The automatic sample feeding device comprises a machine box, a Y-axis movement assembly, an X-axis movement assembly and a sample feeding module. The automatic sample feeding device is characterized in that a clamping groove for fixing a test tube rack is formed in a bottom plate of the machine box; a fixing bracket is arranged on the side face of the machine box; the Y-axis movement assembly is fixedly arranged at the upper end of the fixing bracket of the machine box through a screw; the X-axis movement assembly is fixedly arranged on a Y slide block of the Y-axis movement assembly; the sample feeding module is fixedly arranged at the lower end of the fixing bracket. The automatic sample feeding device adopts a quantitative tube device to realize accurate control of liquid feeding amount; a quantitative tube is matched with a liquid level sensor to be used so that an injection molding pump stops a liquid feeding process when the liquid feeding amount reaches the liquid level sensor; a reagent only exists in the quantitative tube and a pipeline and does not flow into the injection molding pump so that pollution and corrosion to the injection molding pump caused by liquid are avoided. According to the automatic sample feeding device, the liquid feeding amount is increased and the sample feeding of two types of liquid can be realized simultaneously.

Description

technical field [0001] The invention relates to a sampling system, in particular to an automatic sampling device for testing water quality chemical oxygen demand. Background technique [0002] With people's attention to environmental quality, water quality monitoring has also been paid more and more attention by the environmental department. At present, most of the sampling methods for laboratory water quality chemical oxygen demand detection are manual sampling, that is, the operator adds the required oxygen to the sample. Potassium dichromate and concentrated sulfuric acid reagents are used for follow-up detection; this manual injection method will affect the injection volume due to the human error of the operator, and the accuracy of the injection cannot be guaranteed, and the operation of concentrated sulfuric acid is also dangerous. The sampling method takes a long time to inject samples, and the work efficiency is relatively low; at present, although there are various ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an automatic sampling device for detecting the chemical oxygen demand of water quality, which has the advantages of simple structure and easy operation, high sampling accuracy and good repeatability It effectively overcomes the problems of long time, complicated operation and unguaranteed sampling accuracy in the manual sampling operation in the laboratory.

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