Axially Displaceable Deflection Roller for Elevator Belt Alignment
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Solution Overview
Problem
In elevator systems, non-driven deflection pulleys often experience skewing and misalignment issues when multiple suspension elements are guided over the same pulley, leading to diagonal pull, noise, and increased wear due to relative movements and the 'stick-slip effect, which existing solutions fail to adequately address.
Innovation Solution
The deflection pulleys are designed to be axially displaceable relative to the shaft, using materials like slippery plastics and sliding sleeves with low friction coefficients, allowing for axial displacement to compensate for misalignment and reduce friction, and incorporating flanged pulleys and sliding coatings to prevent skewing and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple suspension elements are guided over the same deflection pulley, then the pulley system can handle multiple loads, but skewing and misalignment occur leading to diagonal pull and increased wear
Solution Approach 1:
The deflection pulley is designed with axial displaceability, allowing it to dynamically adjust its position along the shaft axis to compensate for misalignment and diagonal pull caused by multiple suspension elements. This dynamic adjustment capability maintains proper alignment without requiring rigid fixed positioning.
Solution Approach 2:
The deflection pulley is segmented into multiple independent deflection pulleys arranged on a common shaft. Each deflection pulley can be independently adjusted axially to accommodate and guide multiple suspension elements separately, preventing them from interfering with each other and reducing skewing effects.
2Reliability
If flanged wheels are used to prevent suspension elements from running off, then guidance is improved, but noise and wear increase due to heavy contact
Solution Approach 1:
The design changes the contact parameters by using axially displaceable deflection pulleys that maintain lighter, more controlled contact with suspension elements. This reduces the impact forces and friction that cause noise and wear, while still providing adequate guidance through the axial adjustment capability.
Solution Approach 2:
The receiving sleeve acts as an intermediary between the shaft and the deflection pulley, enabling smooth axial displacement. This intermediary mechanism allows the pulley to self-adjust and maintain optimal contact conditions without the heavy, noisy contact that would occur with rigid flanged wheels.
3Stability of the object's composition
If the deflection pulley is firmly connected to the shaft, then structural stability is improved, but skewing cannot be compensated and maintenance becomes difficult
Solution Approach 1:
The connection between the deflection pulley and shaft is made dynamic rather than rigid. The receiving sleeve allows controlled axial movement while maintaining rotational stability, enabling the pulley to compensate for skewing during operation and facilitating easier maintenance by allowing axial displacement for inspection and repair.
4Reliability
If axial displacement capability is added to compensate for misalignment, then skewing is reduced, but device complexity increases
Solution Approach 1:
The deflection pulley system is designed to self-adjust axially along the shaft to compensate for misalignment and diagonal pull. This self-service capability eliminates the need for complex external adjustment mechanisms, achieving alignment compensation through the inherent axial mobility provided by the receiving sleeve.
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
This design effectively absorbs axial force components, prevents suspension elements from running off the guide, reduces noise and wear, and allows for easy maintenance by enabling axial displacement and rotation, thereby minimizing skewing and the 'stick-slip effect.
Implementation Method 1
The receiving sleeve 12 is provided with a coating of PTFE (polytetrafluoroethylene, also known as Teflon coating) on its outer surface... the deflection pulleys 9a, 9b, 9c can slide in the axial direction if an axial force component occurs
Implementation Method 2
The receiving sleeve 12 is provided with a coating of PTFE (polytetrafluoroethylene, also known as Teflon coating) on its outer surface, which contacts the inner surfaces of the hubs of the deflection pulleys 9a, 9b, 9c
Data Source
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AI summary
The invention relates to a deflection roller in a flexible drive, preferably in a lift drive with lift or supporting belts, wherein the deflection roller can be rotatably mounted and comprises several deflection disks mounted on a shaft. The flexible intermediate link, the deflection roller or the deflection disks pass around or are wound around a partial circumference an outer peripheral surface and the deflection disks are rotatably arranged and mounted so that they can move axially with respect to shaft.