Elevator Safety Device Energy-Saving Trip Mechanism
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Solution Overview
Problem
Elevator safety devices with triggers consume excessive energy due to the need for strong electromagnetic actuators to hold the trigger in its ready position against the force of a main spring, which is not optimized for reduced energy consumption without compromising the trigger's activation force.
Innovation Solution
An elevator safety device with a trigger that uses an electromagnetic actuator indirectly through a converter, reducing the force required to hold the actuating member in its ready position by at least 25% to 50% compared to the main spring's force, and includes a second actuator for resetting the trigger, allowing for a more efficient energy usage during regular operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a strong main spring is used to ensure sufficient activation force, then the trigger reliability is improved, but the energy consumption of the electromagnetic actuator increases
Solution Approach 1:
A converter mechanism is introduced as an intermediary between the electromagnetic actuator and the actuating element. This converter mechanically amplifies the actuator's force, allowing a weaker electromagnetic actuator to effectively hold against a strong main spring, thus reducing energy consumption while maintaining trigger reliability
Solution Approach 2:
The system is designed so that the electromagnetic actuator only needs to maintain the actuating element in its ready position against the spring force, without needing to generate the full activation force. The main spring itself provides the activation force when triggered, separating the holding function from the activation function
2Device complexity
If the electromagnetic actuator directly acts on the actuating element, then the device complexity is reduced, but the actuator force requirement increases
Solution Approach 1:
The converter serves as a mechanical intermediary that translates the actuator's motion into effective engagement with the actuating element. This allows the actuator to operate with lower force requirements while still achieving the necessary holding effect against the main spring
Solution Approach 2:
The converter mechanism transforms the actuator's linear motion into a different dimensional engagement that provides mechanical advantage, effectively multiplying the actuator's force output without increasing the actuator's power consumption
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 solution significantly reduces energy consumption during regular operation while maintaining the necessary force for trigger activation, allowing for reliable and efficient elevator safety device operation.
Implementation Method 1
an electromagnetic actuator (4) that holds the actuating element (2) in its ready position by means of the force it generates electromagnetically against the tension of the main spring (3)
Implementation Method 2
the actuating element (2) is brought into its release position by the main spring (3) as soon as the electromagnetically generated force of the actuator (4) drops away
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Lift safety device (ASE) with a release mechanism (1) comprising an actuating element (2) pre-tensioned by means of at least one main spring (3) and an electromagnetic actuator (4) which holds the actuating element (2) in its ready position by means of the force it generates electromagnetically against the tension of the main spring (3), while the actuating element (2) is brought into its release position by the main spring (3) as soon as the electromagnetically generated force of the actuator (4) drops away, wherein the electromagnetic actuator (4) acts on the actuating element (2) via a transducer, the transducer being designed such that the force which the actuator (4) must exert electromagnetically to hold the actuating element (2) in its ready position is less than the force generated by the tension of the main spring (3).