Cap piercing station for closed container sampling system

B - Operations – Transporting – 67 – B

Patent

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Details

B67B 7/52 (2006.01) G01N 1/00 (2006.01) G01N 35/10 (2006.01)

Patent

CA 2413125

A piercing station for piercing sample container caps or thick stoppers. The piercing station has a structural frame with two vertical guide rods. A carriage assembly is slidably mounted on the guide rods and is further driven to move up and down along the guide rods. The carriage assembly carries a blade holder, which in turn holds a piercing blade assembly. The blade assembly includes a center blade and two cross blades interlocked together, such that the blade assembly has a generally modified "H"-shaped cross section for piercing a cap on the sample container. Lubricant left in or on the sample container cap by the piercing station reduces the force required by the sample probe to penetrate thick stoppers for sample aspiration and level sensing. The "H"-shaped cut helps to equalize the pressure in the sample container during sampling, so that clot detection is more effective.

L'invention concerne un poste de perçage permettant de percer des couvercles de récipients d'échantillons ou des opercules épais. Le poste de perçage comporte un cadre formant une structure et présentant deux tiges de guidage. Un tablier est monté de manière à pouvoir coulisser le long des tiges de guidage pour être ensuite soumis à un mouvement alternatif vertical le long des tiges de guidage. Le tablier comporte un porte-lames, qui à son tour maintient un ensemble de lames de perçage. L'ensemble de lames comprend une lame centrale et deux lames perpendiculaires liées par liaison de forme, de manière que l'ensemble des lames présente une section en forme de <= H >= globalement modifiée afin de percer un couvercle sur le récipient d'échantillons. Le lubrifiant laissé dans ou sur le couvercle du récipient d'échantillons par le poste de perçage réduit la force requise par la sonde d'échantillon pour percer des opercules épais afin de permettre l'aspiration des échantillons et la détection d'un niveau. La coupure en forme de <= H>= permet d'équilibrer plus facilement la pression dans le récipient d'échantillons durant l'échantillonnage, ce qui rend la détection de grumeaux plus efficace.

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