Hoisting Device Frame Segmentation for Diecast Manufacturing
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Solution Overview
Problem
The existing hoisting and pulling devices face issues with complex main body frame shapes unsuitable for aluminum diecasting, low gear transmission efficiency, large load on bearings, low durability, and dust invasion in mechanical brake portions.
Innovation Solution
A hoisting and pulling device with a main body frame that includes a load sheave, drive shaft, driving means, and speed reducing means, where bearing plates partition the load sheave containing space and are fixedly attached to the frame using screws, allowing for efficient gear alignment and dust prevention, and a hand wheel cover that guides the hand chain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the speed reducing machine side frame, brake side frame and connecting frame are integrally molded, then the number of parts and integrating steps is reduced and cost is reduced, but the shape of the main body frame becomes complicated which is not suitable for integral molding by aluminum diecasting
Solution Approach 1:
The patent divides the main body frame into multiple separate frames (speed reducing machine side frame, brake side frame, connecting frame) that are not integrally molded but rather assembled together. This segmentation allows each frame to have a simpler, more manufacturable shape suitable for aluminum diecasting, while still achieving the overall function of a unified structure through proper connection and alignment mechanisms.
2Loss of energy
If the speed reducing gear is aligned according to the existing structure, then the gear transmission efficiency is low, the load applied on bearing is large, and durability is low
Solution Approach 1:
The patent optimizes the alignment parameters of the speed reducing gear by precisely controlling the positional relationship between the drive shaft and the speed reducing gear through the separate frame structure. This allows for improved gear meshing parameters, reducing transmission losses and decreasing the load on bearings, thereby enhancing both transmission efficiency and durability.
3Ease of manufacture
If the main body frame is simplified for diecasting, then the manufacturing ease is improved, but the gear alignment precision may be compromised
Solution Approach 1:
The patent introduces connection structures and alignment mechanisms that act as intermediaries between the simplified diecast frames and the precision gear alignment requirements. These intermediary elements ensure accurate positioning and alignment of the speed reducing gear while maintaining the manufacturing simplicity of the separate diecast frames.
Data Source
AI summary
A hoisting and pulling device including a main body frame 2 for forming a load sheave containing space by constituting an inner face by a guide face 25a for guiding a load chain 5 wound around a load sheave, a bearing plate 21b fixedly provided to an inner side of the main body frame 2 for bearing the load sheave and a speed reducing gear on a side of speed reducing means, and a bearing plate 21a for bearing the load sheave 11 on a side of driving means for partitioning the load sheave containing space, the driving means, and the speed reducing means by the bearing plates.According to a hoist of a background art, portability and operability and durability are not compatible with each other and the hoist is not provided with a function of preventing dust of a mechanical brake. Further, a problem is posed also in the operability of the hand chain.