Automatic sample injector bottle pressing assembly

Abstract

The invention relates to an automatic sample injector bottle pressing assembly, which comprises a needle seat, a needle assembly, a bottle pressing guide rail, a tension spring, a position limiting frame and a bottle pressing block, wherein a sliding block is fixed on the needle seat, the needle assembly is fixed on the needle seat, the bottle pressing guide rail is provided with a sliding groove,the sliding groove and the sliding block form a sliding pair in a matched manner so as to make the bottle pressing guide rail slide relative to the needle seat in a direction parallel to the needle assembly, the upper end of the tension spring is fixed on the bottle pressing guide rail, the lower end of the tension spring is fixed on the needle seat, the position limiting frame is fixed on the bottle pressing guide rail and is used for detecting whether the bottle is deficient by matching with a bottle deficiency detection opticalcoupler, the bottle pressing block is fixed on the lower end ofthe bottle pressing guide rail and is provided with a through hole concentric with the needle assembly, and the needle assembly can penetrate through the through hole of the bottle pressing block. According to the present invention, the automatic sample injector bottle pressing assembly can detect the bottle deficiency, can prevent the automatic sample injector from idle walking, can reduce the failure probability of the puncture action of the automatic sample injector, can improve the reliability, can effectively balance the pressures inside and outside the sample injection bottle, and can ensure the accuracy of the sample injection volume.

Description

technical field [0001] The invention relates to a liquid chromatograph sample injector, in particular to a pressure bottle assembly of an automatic sample injector. Background technique [0002] A liquid chromatograph generally consists of a high-pressure infusion pump, a liquid storage bottle, a sample injector, a chromatographic column, a detector, a waste liquid tank, and a data recording and processing device. One end of the high-pressure infusion pump is connected to the liquid storage bottle through a catheter, the other end is connected to the inlet of the sampler through a catheter, the outlet of the sampler is connected to the inlet of the chromatographic column through a catheter, and the outlet of the chromatographic column is connected to the detector through a catheter. The device is connected with the data recording and processing device through the data line. The working principle of the liquid chromatograph is: the mobile phase is installed in the liquid sto...

AI Technical Summary

Problems solved by technology

In the actual use of the autosampler, it often happens that the needle is deflected and the needle is bent, or the needle is blocked when it moves downwards, causing the motor to lose steps and report an error

There are many reasons for these failures: the bottle-pressing assembly has no missing bottle detection, and the needle does not prevent the needle from pricking downward when the needle is deflected; , causing the motor to lose steps and report an error; the pressure bottle component is biased, resulting in false alarms for bottle lack detection, etc.

These are all detrimental factors that affect the reliability of the autosampler

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