Forklift Scale With Flexure Isolation For Accurate Weighing
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Solution Overview
Problem
Existing forklift scales face issues such as obstructing the operator's view, difficulty in installation and adjustment, inaccurate readings due to flexure or attachment to the forklift, and the need for complex leveling procedures, making them inefficient and inconvenient for use in industrial settings.
Innovation Solution
A forklift scale design featuring a rear frame attached to the lifting carriage with a front frame that is vertically displaceable, incorporating load cells between the frames, and specialized flexures to resist tensile and compressive forces while allowing vertical displacement, allowing for easy installation and accurate weight measurement without obstructing the operator's view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a scale is mounted to a forklift to enable in-transit weighing, then weighing efficiency is improved and time is saved, but the scale structure becomes more complex and installation becomes more difficult
Solution Approach 1:
The scale structure is merged with the forklift's existing lifting carriage and fork assembly. The load cells are integrated into the fork mounting mechanism, and the flexure assemblies are incorporated into the existing structural framework, eliminating the need for separate scale components and reducing overall system complexity despite the added functionality.
Solution Approach 2:
The scale components serve multiple functions: the load cells not only measure weight but also provide structural support for the forks; the flexure assemblies both allow necessary movement and maintain structural integrity; the mounting system integrates weighing capability with the existing forklift operation system, making the entire assembly multi-functional.
2Measurement precision
If load cells are used to measure weight accurately, then measurement precision is improved, but the scale becomes more sensitive to flexure and attachment issues
Solution Approach 1:
The flexure assemblies act as intermediaries between the load cells and the forklift structure. They isolate the load cells from structural flexure and attachment variations, allowing the load cells to measure only the vertical weight force without interference from lateral movements or structural deformations, thus maintaining both precision and reliability.
Solution Approach 2:
The flexure assemblies are designed with specific local properties - they are flexible in vertical and lateral directions to accommodate forklift movement, but rigid enough to provide stable mounting for the load cells. This localized differentiation of mechanical properties ensures that the measurement zone remains stable while the overall structure remains adaptable.
3Adaptability or versatility
If the mast is positioned in a raised position during transport, then load transport capability is improved, but the operator's view is obstructed by the scale
Solution Approach 1:
The scale's measurement and display components are extracted from the central mast area and positioned at the rear of the forklift. The load cells are mounted horizontally at the rear, away from the operator's line of sight, while still being functionally connected to the lifting mechanism through the flexure assemblies, thus maintaining visibility while enabling raised mast operation.
4Measurement precision
If a traditional pallet scale is used for weighing, then accurate weight measurement is achieved, but additional floor space and time are required
Solution Approach 1:
The weighing function is merged with the forklift's load handling capability. The scale measures weight during the normal forking and lifting operation without requiring the load to be placed on a separate scale platform, eliminating the additional time and space requirements of traditional pallet scales while maintaining measurement accuracy through the integrated load cells.
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
The design enables efficient and accurate weighing of loads while minimizing setup time and complexity, maintaining operator visibility and preventing distortion that could lead to inaccurate readings.
Implementation Method 1
A pair of load cells is interposed between the rear frame and the front frame
Implementation Method 2
at least one upper flexure assembly is connecting a top portion of the front frame to a top portion of the rear frame, and at least one lower flexure assembly is connecting a bottom portion of the front frame to a bottom portion of the rear frame
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
A 3-point suspension forklift scale adapted for quick and easy attachment/detachment to/from a forklift - without the need for leveling or other pre- operation setup procedures. Further, due to the single lower reaction point of the forklift scale, there is no concern that the initially installed position of the forklift scale will change during use as a result of a loose adjuster, repositioning due to impact, etc. The forklift scale is designed to accurately determine the weight of a load placed on the forks or other lifting elements of the forklift, regardless of the position of the load thereon. Preferably, a forklift scale of the present invention includes a central viewing window that allows an operator see through the forklift scale when operating an associated forklift.