Syringe Assembly Device with Motor-Driven Barrel Rotation
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Solution Overview
Problem
Existing syringe assembly devices face challenges in accurately screwing plunger rods into gaskets within barrels due to variations in lead angles and improper gasket positioning, leading to incomplete or inaccurate screwing.
Innovation Solution
A syringe assembly device with a barrel support device for rotational support, a plunger rod support device featuring a chuck and load application mechanism, and a rotation application device that applies axial and downward loads to the plunger rod, ensuring precise screwing by synchronizing the movement of the plunger rod with the gasket's lead angle, and allowing for adjustments through motor control programs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a belt mechanism is used to rotate the barrel for screwing, then the barrel can be rotated to perform screwing operation, but the belt must be precisely adjusted to match the lead angle of the screw, requiring frequent adjustments when lead angle varies
Solution Approach 1:
The patent replaces the mechanical belt transmission system with a motor-driven rotation application device. The motor can be controlled to rotate the barrel at precise speeds and angles, eliminating the need for mechanical belt angle adjustments when lead angles vary. This substitution of mechanical transmission with controlled motor rotation resolves the contradiction by providing both operational capability and adaptability without complex mechanical adjustments.
Solution Approach 2:
The patent introduces a dynamic control system where the rotation speed and angle of the barrel can be adjusted based on the specific lead angle of the screw. Instead of a fixed mechanical belt arrangement, the system dynamically adapts the rotation parameters to match the screw characteristics, allowing easy adjustment when lead angles vary without physical reconfiguration.
2Manufacturing precision
If the plunger rod is lowered by a three-dimensional cam mechanism, then the plunger rod cannot rotate during screwing, but improper gasket positioning causes movement mismatch leading to insufficient screwing
Solution Approach 1:
The patent implements a feedback control mechanism where sensors detect the actual position of the gasket and the movement of the plunger rod during screwing. The control system compares the detected position with the expected position based on the lead angle, and adjusts the rotation speed or plunger rod movement accordingly to ensure complete screwing even when gasket positioning varies.
Solution Approach 2:
The patent allows dynamic adjustment of screwing parameters such as rotation speed, torque, and plunger rod descent rate based on detected gasket positioning. When improper positioning is detected, the system modifies these parameters to compensate and ensure adequate screwing depth, rather than relying on fixed cam-based movement.
3Ease of operation
If an obliquely arranged belt is used to transmit rotation, then the barrel can be rotated, but the belt prevents the barrel from moving up and down freely, requiring precise angle matching
Solution Approach 1:
The patent replaces the oblique belt transmission mechanism with an independent motor-driven rotation system. The motor can rotate the barrel freely without constraining vertical movement, as the rotational force is applied directly through the motor shaft rather than through an angled belt that physically restricts barrel displacement.
Solution Approach 2:
The patent separates the rotation function from the vertical movement function. The rotation application device handles barrel rotation independently, while the plunger rod support device handles vertical positioning and lowering. This functional segmentation allows the barrel to rotate freely without being constrained by the mechanism responsible for rotation.
Data Source
AI summary
A barrel support device supports a barrel rotationally about an axis of the barrel with the axis being arranged vertically and an opening of the barrel through which a plunger rod is inserted being directed upward. A chuck of a plunger rod support device holds the plunger rod in a first holding state in which the plunger rod is prevented from rotating about and sliding along its axis and inserts it into the barrel. Then, the chuck enters a second holding state in which the plunger rod is prevented from rotating about its axis but is not prevented from sliding along its axis. A load application device places a load acting downward on the plunger rod, and a rotation application device rotates the barrel in a direction in which the plunger rod is screwed into a gasket in the barrel.