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Strain Gauge Load Cell Elastic Element Design Introduction

Strain gauge load cell is made up of elastic elements (external load elastomer), strain resistance transformer elements (resistance strain gauge of different types) and inverters (Wheatstone bridge circuits). Among them, advancement and reasonability of elastic elements is the linchpin to high accuracy and stability of strain gauge load cells.
Strain gauge load cell (hereinafter abbreviated as load cell) is a technology-intensive and skill-intensive high-tech product, featuring diversification, marginalization, synthesis and skillfulness of its design and manufacturing techniques. As an application integrating multiple subjects, technologies and manufacturing processes, the load cell is a physical property-type sensor under the category of physical sensors according to its external information and transformational effect. It is designed based on Hooke's Law, a material rule in physics. This material law is a law indicating objective characteristics of metal materials, which can be written as σ=Eε. Elastic elements are usually the most important mechanical part of any load cell, which can function against reaction of the load. Meanwhile, the load functions on an independent and usually even strain field, which is convenient for measurement of the resistance strain gauge. Basic characteristics of the load cell are closely connected with structural forms and metal materials of elastic elements. In other words, the fixed characteristics of metal materials mainly realize detection of the weight information via the strain transformer elements. Therefore, load cell design mainly consists of the structural and boundary design of elastic elements and the metal material selection of elastic elements. Its main task is to integrate the performance of elastic elements of any structure with the performance of metal materials. It has been widely acknowledged that structure is the basis, materials are the linchpin, processing is at the core and detection provides the guarantee. According to strain differences, load cell can be divided into normal stress elastic elements and shear stress elastic elements.
After that, typical structures and mechanical characteristics of normal stress and shear stress elastic elements widely used at home and abroad are introduced and analyzed in great detail. To be specific, the structural forms, mechanical characteristics and key design points of the typical normal stress elastic elements and shear stress elastic elements. The former including cylinders, circular rings, board rings, reversion and bending ring, straight beam, bending beam, and parallel girder, and the latter including rectangular, I shape, circular section I-shape, and rectangular hollowed section shear beam.

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