Roberval Load Cell Nested Stopper Mounting
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Solution Overview
Problem
The existing Roberval-type load cells face difficulties in accurately and easily mounting stopper members to prevent excess loads, as the precise positioning of stopper members with small gaps is challenging, and the conventional stopper mechanisms often interfere with the weighing platform attachment.
Innovation Solution
A Roberval-type load cell design featuring cylindrical stopper members with concentric circular holes allows for easy and accurate mounting by forming first and second circular holes with specific dimensions, ensuring the stopper member's base end fits into the first hole and its tip end creates a predetermined gap within the second hole, preventing excess load damage without obstructing the weighing platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stopper members are provided outside or on the load cell body to prevent excess loads, then the load cell is protected from damage, but the mounting precision and ease of installation deteriorate due to the difficulty of positioning stopper members with small gaps
Solution Approach 1:
The stopper member is nested inside the movable section, with the tip end positioned within the inner peripheral surface of the movable section. This nested configuration eliminates the need for external stopper mounting while maintaining excess load protection functionality.
Solution Approach 2:
The tip end of the stopper member acts as an intermediary element that contacts the strain gauge supporting section internally to prevent excess load transmission. This internal contact mechanism replaces external stopper-contact configurations.
2Reliability
If stopper members are positioned with small gaps to prevent excess loads, then protection is achieved, but the complexity of positioning and mounting increases
Solution Approach 1:
The stopper member is designed to be self-positioning within the movable section. The tip end naturally contacts the strain gauge supporting section at the correct position without requiring external adjustment or complex positioning mechanisms, enabling self-service mounting.
Solution Approach 2:
Instead of positioning stopper members externally with precise gaps, the invention inverts the approach by placing the stopper internally where its tip end contacts the strain gauge supporting section. This reversal simplifies the positioning requirement.
3Reliability
If stopper members are provided externally to prevent excess loads, then load protection is ensured, but the attachment of weighing platforms is obstructed
Solution Approach 1:
The stopper member is nested within the movable section's internal space, specifically with its tip end positioned inside the inner peripheral surface. This internal nesting eliminates external protrusions that would obstruct weighing platform attachment while maintaining protection functionality.
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 configuration facilitates accurate and effortless stopper member mounting, ensuring the load cell can effectively prevent damage from excess loads while allowing for smooth attachment of weighing platforms, enhancing the ease and precision of the mounting process.
Implementation Method 1
The strain gauge 46 has a characteristic in which its electric resistance changes according to a degree of extension or contraction
Data Source
Figure 1
Figure 2A~2D
Figure 3A~3D
AI summary
Provided is a load cell which includes a stopper member for preventing an excess load from being applied to the load cell to prevent damages to the load cell which would be caused by the excess load, and which makes it possible to carry out a work for mounting the stopper member accurately and easily. A load cell 1 of the present invention is a Roberval-type load cell, comprising: an upper beam 2 section extending horizontally; a lower beam section 3 extending below the upper beam section 2 in parallel with the upper beam section 2; a fastening section 4 which connects one end of the upper beam section 2 and one end of the lower beam section 3 to each other and is fastened to a stationary object; a movable section 5 which connects the other end of the upper beam section 2 and the other end of the lower beam section 3 to each other and is displaced vertically by a load applied vertically to the movable section 5; and a cylindrical stopper member 7 having a circular cross-section. The fastening section 4 has a first circular hole 9 having a circular cross-section. The movable section 5 has a second circular hole 10 having a circular cross-section and being concentric with the first circular hole 9. A base end portion of the stopper member 7 is fitted into and fastened to the first circular hole 9 and a tip end portion of the stopper member 7 is located at an inner side of the second circular hole 10 such that there is a space of a specified width between the tip end portion and an inner surface of the second circular hole 10.