Elevator Cable Clamping Arm Assembly for Swing Restraint
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Solution Overview
Problem
Elevator traveling cables often swing excessively due to vibration in high-rise buildings, causing wear and safety hazards, as existing solutions fail to effectively mitigate this issue.
Innovation Solution
A clamping device with a base and clamping arm assemblies that apply different damping forces to restrain and release the cable, allowing it to enter and exit a limiting space based on specific force thresholds, preventing excessive swinging and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the traveling cable is allowed to move freely in the elevator hoistway, then the cable can maintain flexibility and accommodate elevator car movement, but the cable swings excessively causing wear and safety hazards
Solution Approach 1:
The clamping device acts as an intermediary between the traveling cable and the elevator hoistway structure. It provides a controlled interaction point that allows the cable to move vertically with the elevator car while preventing harmful lateral swinging movements. The clamping arm assembly with differential damping forces serves as the mediating mechanism that selectively permits or restricts cable motion based on the direction and magnitude of applied forces.
Solution Approach 2:
The invention changes the damping parameter of the clamping device based on the direction of cable movement. The first damping force (Fc1) allows cable entry into the limiting space, while the second damping force (Fc2) prevents cable exit unless an external pulling force is applied. This parameter change approach enables the device to adapt its restraint characteristics dynamically, permitting necessary cable movement while preventing excessive swinging.
2Stability of the object's composition
If a clamping device with high damping force is used to prevent cable swinging, then cable stability improves, but the cable cannot enter the limiting space when needed
Solution Approach 1:
The clamping arm assembly is designed with dynamic characteristics that allow it to respond differently to forces in opposite directions. The differential damping forces (Fc1 for entry, Fc2 for exit) create an asymmetric dynamic response that enables cable entry under normal operating conditions while preventing exit unless an external pulling force exceeds Fc2. This dynamic design allows the device to transition between restrained and permissive states based on the applied force direction and magnitude.
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 clamping device reliably reduces cable swinging, extends its service life, and prevents safety hazards by ensuring the cable is only disengaged with an external force, thus providing a cost-effective solution for elevator systems.
Implementation Method 1
the first-stage damping member applies a damping force to the first-stage force arm when the first-stage force arm rotates either toward or away from the limiting space; and a second-stage damping member, in which the second-stage force arm is associated with the first-stage force arm, and moves in association with the first-stage force arm when the first-stage force arm rotates away from the limiting space; and when the second-stage force arm moves in association, the second-stage damping member applies a damping force to the second-stage force arm
Data Source
AI summary
A clamping device and an elevator system. The clamping device includes: a base having a limiting space and an opening communicating with the limiting space; and a clamping arm assembly, which is arranged at the opening of the base and forms a gap with the opening in a stationary state, the gap being smaller than a size of a clamped part; in which the clamp arm assembly has a first damping force that allows the clamped part to enter the limiting space via the opening, and has a second damping force that allows the clamped part to exit the limiting space via the opening; and the second damping force is greater than the first damping force.