Hoist Support Shaft Segmentation for Accurate Load Measurement
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Solution Overview
Problem
Existing hoist configurations, such as those described in Patent Literature 1, face issues of increased size and complexity due to the use of a thick shaft and a link mechanism for load support, which complicates the detection of loads and makes the system bulky.
Innovation Solution
A hoist design featuring an upper hook with an insertion hole orthogonal to the hanging direction, a support shaft with a large-diameter portion and end large-diameter portions, and a strain deformation portion with a smaller cross-sectional area for accurate load measurement, utilizing a load measurement means attached to the strain deformation portion to measure shear loads, and a coming-off preventing mechanism to secure the support shaft in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick shaft is employed to support the load through a single shaft inserted into the upper hook, then the load support strength is improved, but the hoist size increases
Solution Approach 1:
The support shaft is divided into segments with different diameters: a hook-side large-diameter portion for insertion through the upper hook, an intermediate portion with smaller diameter for insertion into the support hole, and end large-diameter portions for insertion into the support holes. This segmentation allows the shaft to provide sufficient strength where needed while minimizing overall size.
Solution Approach 2:
Different portions of the support shaft have different diameters tailored to their specific functional requirements. The hook-side large-diameter portion provides strength for hook insertion, the intermediate portion minimizes size while maintaining structural integrity, and the end large-diameter portions ensure proper fit in the support holes. This local differentiation resolves the contradiction between strength and size.
2Measurement precision
If a link mechanism is used to support the strain part below the upper hook, then the load detection accuracy is improved, but the configuration becomes complicated
Solution Approach 1:
The strain part is extracted from the complex link mechanism and directly integrated into the support shaft structure. The strain deformation portion is formed as an integral part of the support shaft, eliminating the need for separate link mechanisms while maintaining load detection accuracy.
Solution Approach 2:
The support shaft and strain measurement function are merged into a single integrated component. The support shaft simultaneously provides structural support and houses the strain deformation portion for load measurement, eliminating the need for separate link mechanisms and reducing overall configuration complexity.
3Measurement precision
If the intermediate portion of the support shaft is inserted into the support hole, then the load measurement accuracy is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The support shaft is segmented into portions with different diameters, with the intermediate portion specifically designed to be inserted into the support hole. This segmentation allows the intermediate portion to provide accurate strain measurement while the larger hook-side and end portions provide structural strength, and the segmentation itself helps manage manufacturing precision requirements by allowing different tolerance levels for different sections.
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 allows for a safe and simple configuration with accurate load detection without increasing the hoist's size, preventing the upper hook from coming off and ensuring stable operation by using a strain measurement unit in a support hole of the main frame.
Implementation Method 1
a strain deformation portion that is provided at an intermediate portion extending from, of the support shaft, the hook-side large-diameter portion to the end large-diameter portion, the strain deformation portion having a radial cross-sectional area smaller than that of the intermediate portion, and a load measurement means that is attached to the strain deformation portion and measures a shear load acting on the strain deformation portion
Data Source
AI summary
A hoist comprising: an upper hook; a support shaft that includes a hook-side large-diameter portion inserted through an insertion hole of the hook at a center portion, end large-diameter portions at both ends, an intermediate portion between the hook-side large-diameter portion and the end large-diameter portion, and a strain deformation portion that is provided at the intermediate portion; a main frame that includes a pair of support holes and is suspended and supported by the upper hook via the support shaft with the end large-diameter portion on one side inserted in the one support hole and the end large-diameter portion on the other side inserted in the other support hole; and a load measurement means that is attached to the strain deformation portion and measures a shear load acting on the strain deformation portion, wherein at least a portion of the intermediate portion is inserted in the support hole.