The load cell manufacturer tells you what materials you need
At present, the load cell has been applied in various fields of industry, and we need to know what materials we need.
1. Strain gauge and resistive component materials
The composition of the resistance strain gauge is complex, and it is a composite product. The combination of the strain gauge substrate and the strained copper is ever-changing. According to its strain requirements, there are currently nearly a thousand products. Generally, the substrate is made of a polymer film material, and the strain material is high-purity constantan. The Constantan on the substrate is optically treated to etch different resistance-deformed resistance wires. Therefore, the quality of the strain gauge is not only related to the material quality of the substrate and the purity of the composite metal, but also related to the composite process, etching technology and process, etching chemical materials and post-treatment processes and materials.
2. Elastomeric material
The force sensor elastomer material is generally made of metal material. Most of the materials that can be used are aluminum alloy, alloy steel and stainless steel. The alloy material has rigidity to ensure uniform deformation and deformation recovery, and good weathering and corrosion resistance. The main requirement of the elastomer is to be able to accurately transmit the force information and maintain the deformation consistency and complete resetting under the same force.
3. The material of the sealant
In the initial stage of the load cell with insufficient welding technology and equipment, a special silicone rubber sealant series is used. Silicone rubber has long-term chemical stability, so it has excellent properties such as anti-corrosion, moisture-proof, aging-resistant, and insulation. It has long been the first choice for all sealants.
4. Material of the patch adhesive
The adhesive for strain gauge patch mainly uses two-component polymer epoxy adhesive. The properties of polymer chemical products are closely related to the physical and chemical indexes of each component, such as purity, molecular chain structure and size. , storage time, composition ratio, molecular modification, mixing method, mixing and curing time, curing time, curing temperature, additives and percentage.
5. Wire sealing materials and methods
Each component of the load cell affects the final technical performance of the sensor. Some load cells only use a simple and fixed way to avoid the movement of the sensor wires and damage the electronic circuit of the sensor. Some load cells with short conduction distances are even only Rely on the rubber seal. However, a large-volume, heavy-weight load cell, if there is no proper wire fixing or sealing, is the bottleneck that the load cell is most prone to failure. In particular, when the sealing head is fixed, the material and fastening strength of the fastener will also affect the final technical performance of the load cell. Observers have found that it is rare to use fasteners to install sealing adhesives, which avoids residual stresses caused by fastening forces and does not cause leakage due to insufficient fastening force.
6. Force sensor wire material
The wire is still part of the load cell. The metal material of the force sensor wire is due to the difference in quality of the household electrical wires. After all, the wire is the path for bridge power supply, signal output, and long-line excitation voltage compensation. The silver-plated wire is definitely better than the copper wire. The copper wire is definitely better than the aluminum wire. The effect is self-evident.
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