Mobile Car Sheave Shield for Elevator Rope Angle Adjustment
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Solution Overview
Problem
The existing V-shaped traction system in elevator devices fails to provide a safety clearance that meets the safety requirements, as the included angle between suspension ropes varies, posing a risk to maintenance personnel working on the car top.
Innovation Solution
A mobile car sheave shield is designed with a static shield part and a dynamic shield part, where the dynamic shield part, comprising a shield bracket with inner and outer mobile shields, moves synchronously with the traction rope to maintain a constant safety clearance, ensuring the safety of workers by adjusting to changing rope angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a normal static shield is used in a V-shaped traction system, then the shield structure is simple and easy to manufacture, but the shield fails to offer a safety clearance meeting GB12265.1 requirement because the included angle between suspension ropes varies
Solution Approach 1:
The patent transforms the static shield into a dynamic shield that moves with the traction ropes. The dynamic shield part is connected to the car sheave and moves synchronously with the traction ropes, allowing the shield to adapt to varying included angles while maintaining a constant safety clearance of at least 150mm from the car sheave surface, thus resolving the contradiction between reliability and complexity.
Solution Approach 2:
The shield is divided into a static shield part and a dynamic shield part. The static shield part provides fixed protection, while the dynamic shield part moves with the traction ropes to maintain safety clearance. This segmentation allows each part to perform its specific function optimally, ensuring both structural simplicity and safety reliability.
2Reliability
If the shield is designed to move with the traction rope to maintain safety clearance, then the safety clearance constantly meets GB12265.1 requirement, but the device complexity increases due to the dynamic shield part and connecting mechanisms
Solution Approach 1:
The dynamic shield part is merged with the car sheave through connection mechanisms, allowing them to move together as a unified system. This merging ensures that the shield maintains the correct position and safety clearance while minimizing the complexity of independent control mechanisms.
Solution Approach 2:
The dynamic shield part automatically adjusts its position based on the movement of the traction ropes and car sheave, without requiring external control systems. The shield self-regulates to maintain the required safety clearance, reducing the complexity of additional control mechanisms.
Data Source
AI summary
A mobile car sheave shield comprises a static shield part 2 sleeved on a car sheave 1, wherein an opening is formed on upper of the static shield part; a dynamic shield part is arranged on the opening; the dynamic shield part comprises a shield bracket 3; an inner side mobile shield 4 and an outer side mobile shield 5 which are synchronously connected are respectively arranged on two sides of a central axis of the shield bracket from inside to outside; the outer side mobile shield and the inner side mobile shield are slidingly connected on the shield bracket. The present invention has the advantages that: by combining the static shield part and the dynamic shield part, the dynamic shield part is moved by the traction rope, to realize mobile protection of the shield, thus offering a clearance constantly meeting safety requirement and guaranteeing safety of a car top worker.