Syringe Pushing Unit with Contactless Rear End Detection
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Solution Overview
Problem
In existing injecting apparatus, the piston pushing unit may slightly push the piston, causing a small amount of chemical liquid to be extruded from the syringe, necessitating frequent replacement of the syringe.
Innovation Solution
An injecting apparatus with a rear end detection unit that detects the syringe's rear end in a contactless manner, allowing the control unit to control the pushing unit to move forward only by a predetermined distance after detection, preventing unwanted extrusion of the chemical liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston pushing unit moves until abutting against the end of the piston, then the pushing unit ensures contact with the piston for reliable force transmission, but a small amount of chemical liquid may be extruded from the syringe causing the filled amount to change
Solution Approach 1:
The control unit calculates a forward movement distance that stops the pushing unit before it contacts the piston end, based on predetermined safety margins. This preliminary positioning prevents unwanted extrusion while ensuring reliable force transmission during the actual injection process.
2Ease of operation
If the pushing unit abuts against the piston end, then the syringe is securely positioned, but the syringe may need to be replaced with a new syringe due to amount changes
Solution Approach 1:
The system performs preliminary positioning of the pushing unit at a calculated distance from the piston end before injection begins. This preliminary action secures the syringe in place without causing unwanted extrusion, thereby maintaining positioning accuracy while preventing the need for frequent syringe replacements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reliably prevents the unwanted extrusion of chemical liquid from the syringe, reducing the need for frequent syringe replacements by ensuring the pushing unit stops before contacting the syringe's rear end.
Implementation Method 1
the rear end detection unit including a light emitting portion and a light receiving portion
Data Source
AI summary
A pushing unit is stopped just before abutting against a rear end of a syringe to reliably prevent unwanted extrusion of a chemical liquid from a syringe. An injecting apparatus for injecting a chemical liquid includes: an injection head to which a syringe filled with the chemical liquid is to be mounted; a pushing unit provided on the injection head and pushing a rear end of the syringe; a rear end detection unit provided on the injection head and detecting the rear end in a contactless manner; and a control unit configured to control the injection head, the control unit acquiring a forward movement distance that the pushing unit is to be moved forward after the rear end is detected, and causing the pushing unit to move forward by the forward movement distance after the rear end is detected and to stop at a position separated from the rear end.