Mechanical Spring Break Detection for Packaging Machine Lids
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Solution Overview
Problem
Existing spring break detection systems in packaging machines with hinged lids are prone to errors due to contact corrosion and are complex to assemble and maintain, making it difficult to reliably identify broken springs, which can lead to safety issues during emergency stops.
Innovation Solution
A mechanical spring break detection system using a triggering element connected to the relief spring and a trigger spring, where the triggering element moves into a visible or actuated position when the relief spring breaks, allowing for visual or signal-based detection of spring tension loss, and a detection device such as a switch is used to output a warning or prevent further operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrical circuit system with current application is used to detect spring breaks, then spring fracture detection is possible, but the system becomes error-prone and high-maintenance due to contact corrosion
Solution Approach 1:
The patent replaces the electrical detection system with a purely mechanical detection system. A triggering element is mechanically connected to the relief spring, and when the spring breaks, the triggering element moves under the action of a triggering spring to activate a mechanical switch or detection device. This mechanical substitution eliminates contact corrosion issues and simplifies the system while maintaining reliable spring break detection capability
Solution Approach 2:
The patent extracts the detection function from the electrical circuit system and creates a separate, independent mechanical detection pathway. The triggering element is specifically designed to be connected to the relief spring and extract the mechanical energy state (tension or breakage) to trigger a detection signal, separating the detection mechanism from the actuation system and eliminating the need for electrical contacts in the spring circuit
2Reliability
If a mechanical triggering system is used for spring break detection, then the system becomes robust and reliable, but additional components are required
Solution Approach 1:
The patent merges multiple functions into the triggering element and its associated spring mechanism. The triggering element serves both as a mechanical connector to the relief spring and as the detection actuator. The triggering spring provides both the restoring force and the detection signal generation mechanism, combining what could be separate components into an integrated mechanical detection system that adds minimal complexity
Solution Approach 2:
The mechanical detection system is self-actuating through the triggering spring. When the relief spring breaks, the triggering element automatically moves under the pre-loaded triggering spring force to activate the detection device without requiring external power sources, control systems, or additional actuation mechanisms. The system uses the energy stored in the triggering spring itself to perform the detection function
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
The system provides a robust and reliable method for detecting broken springs, ensuring immediate recognition of spring tension loss and enhancing safety by preventing potential accidents through visual or signal-based alerts.
Implementation Method 1
a triggering spring (49) which prestresses the triggering element (37) into a triggering operating position
Implementation Method 2
the relief spring includes a second end operatively connected to the lid such that the relief spring biases the lid toward the open position
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The packaging machine (1) comprises a machine base (16), a cover (7) hinged to the machine base (16) about a pivot axis (A) between a closed position and an open position, and at least one relief spring (21) having a first end (23) attached to the machine base (16) and a second end (25) operatively connected to the cover (7) such that the relief spring (21) biases the cover (7) towards the open position. A release element (37) is connected to the relief spring (21) and is biased to a release operating position by a release spring (49).