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The true face of the load cell - Structural Molecular Dissection

Time:2015.12.03    Click:

Load cell is an automated measurement tool in modern industrial applications , today is the development of multiple types and brands of dazzling, but in the final analysis , the load cell material is nothing more than a combination of the following six :


First , patch adhesive material:
Resistance strain gauge load cells with an adhesive patch main polymer two-component epoxy adhesive , the chemical properties of the product polymer is closely related to the physical and chemical parameters of the individual components , such as purity, molecular chain structure and size , storage time , the ratio of the components of the modified molecule , mixed mode , mixing the curing time , curing time , curing temperature , the percentage of additives and other factors.


Second, the load cell wire material:
Wires are still part of the force sensor consisting of metal weighing sensor wires , electrical wires due to family use, quality differences have personal experience . After all, the bridge wire is powered , the signal output , long-term incentive compensation voltage path , certainly better than silver-plated copper wire conduction effect, certainly better than aluminum copper conduction effect, the effect is self-evident . As more and more various high-frequency interference , the radio waves , the load cell signal is also excellent shielding protection and stability of the method . In addition , environmental erosion, pest abuse, fire retardant , also need a protective layer of material corrosion sensor pest control fire and explosion , and even requires the use of armor protection, protective casing weighing sensors and other methods .


Third , sealant material:
In welding technology and equipment weighing sensor inadequate early stages , are using special silicone rubber sealant . Silicone rubber has a long-term chemical stability , therefore , excellent anti-corrosion, moisture-proof , anti-aging , insulation and other properties, has long been the first choice of all the sealant .


Fourth, wire sealing materials and methods :
Each component of the load cell sensor will affect the final technical performance , some of the force sensor is just a simple way to avoid stationary and mobile sensor wires fixed sensor electronic circuit damage , some of the very short distance conduction load cell or even just rely rubber seal fixed . However, larger, larger weight load cell , without proper wire fixed or sealed manner , that is most likely to produce bottlenecks weighing sensor failure . Especially the installation of the sealing head fixed wire , fasteners and fastening material weighing efforts will give the final performance of the sensor technology impact . Observer found little use in the sealing adhesive fastener installation , to avoid relying on the residual stress caused by the fastening forces of the fixing , the tightening force is not generated due to insufficient leakage problem .


Fifth, the strain gauge and the resistive element material :
Resistance strain gauge load cell complex composition is complex manufactured products , the combination of substrate and strain gage copper in the ever-changing requirements in accordance with the strain , at present, there are about nearly a thousand kinds of products. In general, the base material using a polymer film , made ​​of high purity constantan strain . After the etching process constantan different optically induced strain on the substrate resistance of the gate wire . Thus , not only the quality of resistance strain gauge and the base metal and composite material purity , but also to complex processes, etching technology and processes , etching, chemical materials and post-processing techniques and materials, etc. factors.


Sixth , the elastomeric material :
Load cell elastomer material , generally used in metal material, the material can be used most of the aluminum alloy, alloy steel and stainless steel. Alloy both deformation and deformation stiffness to ensure consistent recovery , corrosion resistance and good weather . The main requirement is that the elastomer can be accurately transmitted information and remain in force when the force of the same strain of consistency and completely reset .

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