Adjustable Pulley Array Stem Inclination Mechanism
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Solution Overview
Problem
In mechanical lift installations, the absence of roller inclination adjustment leads to premature wear of cables and vehicles, causing loss of horizontality and increased maintenance costs due to the need for custom wedges to compensate for stem tilts.
Innovation Solution
A mechanical device with adjustable spacers and beveled wedges allows for post-tightening adjustment of the stem's inclination relative to the shoe, ensuring rollers remain vertical, reducing production costs through standardized parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigid wedge is used to compensate for stem tilt, then roller inclination can be adjusted, but manufacturing precision and procurement costs increase due to custom-made requirements
Solution Approach 1:
The adjustment system is divided into modular components: a standardized rigid wedge with fixed geometry, and an adjustable beam that can be positioned at different angles. This segmentation allows the wedge to be mass-produced as a standard part, while the beam provides the necessary adjustment capability through its articulated design.
Solution Approach 2:
The beam is designed to be adjustable in its angular position relative to the shoe and stem assembly. This dynamic capability allows the system to compensate for various stem tilt angles without requiring custom wedges for each case, thereby reducing manufacturing complexity while maintaining precision.
2Ease of manufacture
If stem tilt is compensated without adjustment means, then production costs decrease, but roller inclination defects occur causing cable and vehicle wear
Solution Approach 1:
The rigid wedge is pre-manufactured with precise geometry to provide the necessary inclination compensation. By preparing this standardized component in advance, the system achieves both ease of manufacture through standardization and reliability through pre-calculated geometric compensation for stem tilt.
Solution Approach 2:
The rigid wedge acts as an intermediary element between the shoe and the stem assembly. It mediates the tilt angle by providing a fixed angular offset that compensates for stem inclination, thereby ensuring vertical roller alignment without requiring complex active adjustment mechanisms.
3Manufacturing precision
If adjustable spacers and wedges are used, then roller alignment precision improves, but device complexity increases
Solution Approach 1:
The adjustment capability is localized to specific positions where inclination compensation is needed, rather than making the entire system adjustable. The rigid wedge and adjustable beam are positioned only where stem tilt compensation is required, keeping the rest of the system simple and fixed.
Data Source
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AI summary
The device has adjustment units adjusting inclination of a support (15) relative to a shoe (20) in a lateral direction (D2) after clamping the shoe relative to the support, where the direction is oriented parallel to rotation axes of sheaves. The units have a spacer (36), with a fixed height, inserted between a zone of a top surface of the shoe and a bottom surface (17) of the support. A spacer (37) having a variable height of the units is inserted between the bottom surface and another zone of the top surface, where the latter zone is displaced relative to the former zone in the direction.