Spring-Driven Injection Actuator Speed Control
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Solution Overview
Problem
Existing electromechanical injection devices face issues with reliability and service life due to the need for electric motors designed for specific load cases, which can lead to frequent failures and inability to maintain constant pressure, especially when cannulas are narrowed or clogged.
Innovation Solution
The injection device is driven solely by a mechanical energy storage device for the entire stroke length, with the electric transport device acting as a speed limiter to control lifting speeds, allowing for reliable operation and longer service life, and ensuring constant pressure through mechanical loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an electric motor is designed for a specific load case to prevent damage to the injection device, then the risk of damage is reduced, but the motor frequently stops and becomes damaged, leading to frequent failures and reduced service life
Solution Approach 1:
The patent replaces the electric motor with a mechanical energy storage device (spring) as the primary driving force. The spring is pre-tensioned to provide the necessary force for the injection stroke, eliminating the need for an electric motor and its associated control systems. This mechanical substitution resolves the contradiction by providing both adequate force protection and improved reliability through a simpler, more robust system with fewer failure points.
Solution Approach 2:
The patent extracts the electric motor from the system entirely, keeping only the essential mechanical components. By removing the electric motor and its control electronics, the system eliminates the source of frequent failures while retaining the core injection function through the spring-driven mechanism.
2Extent of automation
If an electric motor is used to carry out the injection stroke, then automated injection is achieved, but it is not possible to exert constant pressure on the injection device when the cannula is narrowed or clogged
Solution Approach 1:
The spring-driven mechanical system provides inherent constant force characteristics that maintain steady pressure on the injection device throughout the stroke. Unlike electric motors that require complex control systems to maintain constant pressure, the mechanical spring system naturally delivers consistent force, resolving the contradiction between automation and constant pressure capability.
3Adaptability or versatility
If the electric motor is designed with high power to handle load variations, then the injection device can operate under various conditions, but the motor becomes more complex and prone to failure
Solution Approach 1:
The spring-driven system provides inherent adaptability through its mechanical design that can accommodate various injection conditions without requiring complex control systems. The system's simplicity eliminates the trade-off between versatility and complexity, as the mechanical components can handle load variations naturally without electronic controls.
Solution Approach 2:
The spring-driven actuating device serves multiple functions: it provides the driving force for the injection stroke, maintains constant pressure, and operates reliably across various conditions. This multi-functionality in a single mechanical system replaces what would require multiple complex components in an electric motor-based system.
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 design enhances the reliability and service life of the injection device by eliminating electric motor-related failures and maintaining consistent pressure, even when the cannula is narrowed or clogged, while allowing for precise control of injection processes.
Implementation Method 1
driven by the driving force of a mechanical energy storage device (20) over the entire stroke length
Implementation Method 2
the force storage device has a spring means (22) clamped between the actuating device (12) and the support housing (4)
Implementation Method 3
the electrical transport device (26) here forms a speed limiter which, during an injection, acts in the opposite direction to the drive force in order to limit a lifting speed achieved by the energy storage device
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
An injection apparatus (2) has a carrier housing (4), into which an injection device (8) having at least one injection fluid container (10) that can be pressed out can be inserted, and an actuating apparatus (12) which can be driven along an injection direction (R) in order to activate the injection device (8) and which can be acted on by a mechanical energy storage unit (20) and an electrical transport unit (26). The invention provides for the actuating apparatus (12) to be driven in the injection direction (R) by the mechanical energy storage unit (20) and for the electrical transport unit (26) to form a speed limiter.