Elevator Speed Limiter Testing Device for Brake Verification
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Solution Overview
Problem
It is difficult and time-consuming to prove that the braking force transmitted from the speed governor to the governor traction mechanism in an elevator's speed limitation system is sufficient to ensure safe activation of the car brake device, especially when the release mechanism's resistance is increased.
Innovation Solution
A testing device and method that increase the tensile force required to overcome the triggering resistance force of the cabin brake device's triggering mechanism, allowing for a cost-effective and easy-to-use verification of the speed governor's braking capability by connecting the test device to the limiter traction device and the release mechanism separately, ensuring the governor traction mechanism can actuate the release mechanism with a safety factor of at least twice the required force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the release mechanism's resistance force is increased to ensure safer activation, then the safety factor improves, but the difficulty and time required to prove sufficient braking force increases
Solution Approach 1:
The patent introduces a testing device as an intermediary between the limiter traction means and the release mechanism. This testing device includes a force application point and a force measurement point, allowing indirect measurement of the braking force through a mediator system rather than direct measurement, thus simplifying the testing process while maintaining safety verification
Solution Approach 2:
The patent replaces complex direct mechanical measurement of braking force with a simplified measurement system that uses a testing device to apply and measure forces. The testing device substitutes for direct observation of the interaction between the speed governor and release mechanism, making the verification process more manageable
2Device complexity
If direct connection between limiter traction means and release mechanism is used, then the system is simpler, but it becomes difficult to verify sufficient braking force against increased resistance
Solution Approach 1:
The testing device serves as an intermediary that connects to both the limiter traction means and the release mechanism, enabling verification of braking force without altering the direct connection in normal operation. The intermediary testing setup allows measurement and verification while the actual system maintains its simple direct connection
Solution Approach 2:
The testing device enables preliminary verification of the braking system before actual operation with increased resistance. By conducting tests in advance using the testing device, the system ensures that the speed governor can overcome the release mechanism's resistance force before the actual high-resistance condition occurs
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 method and device enable a simple, reliable, and cost-effective verification that the speed governor can safely activate the car brake device even with increased release mechanism resistance, ensuring compliance with safety standards like EN-81 by demonstrating the required braking force and safety factor.
Implementation Method 1
The speed limiter includes means for braking the limiter traction means, which brake the movement of the limiter traction means with a limited braking force
Implementation Method 2
The testing device has a deflection pulley, with the axis of rotation of the deflection pulley being connected to the limiter pulley
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a method and a testing device for testing a speed-limiting system of a lift installation (1). When said speed-limiting system is operating normally, if a lift-car (3) is in an unacceptable motion state then a lift-car braking device (4) is activated by a speed limiter (5) braking a limiter traction means (6) which is connected to a trigger mechanism (11) of said lift-car braking device (4), said trigger mechanism (11) of the lift-car braking device (4) thus being actuated against a trigger resistance force. During testing, the limiter traction means (6) is functionally connected to the trigger mechanism (11) via a testing device (20) that makes it necessary, in order to overcome the trigger resistance force of the trigger mechanism (11), to have a greater tractive force in the limiter traction means (6) than would be the case if said limiter traction means (6) were connected to the trigger mechanism (11) directly.