With the advancement of science and technology, mechanical electronic scales have gradually replaced steelyard scales. There may be quantitative changes in efficiency, but there may be limitations in accuracy. Therefore, various electronic scales have appeared on the market, and the emergence of load cells has completed the conversion of force to electricity, which is welcomed by people. The load cell has resistance strain type, electromagnetic force compensation type, capacitive type, vibrating wire type. In commercial weighing instruments, resistance strain gauge load cells are the best choice. It is small in size, quick in response, easy to use and inexpensive.
Different angles can divide electronic scales into different categories.
(1) In terms of principle and structure, electronic scales can be divided into two categories: mechanical and electronic in terms of weighing principle and structural form. The mechanical type mostly adopts the spring dial structure. The price is cheap, no power supply is required, the mechanical structure is limited, the accuracy is difficult to improve, and the function is single. The electronic type has complete functions, high accuracy, and is easy to be highly integrated.
(2) The electronic electronic scale has complete functions, high accuracy, and is easy to be highly integrated. Therefore, in recent years, electronic electronic scales are the most widely used.
How electronic load cells work?
After the load is placed on the carrier, the carrier applies the gravity to the load cell through the force transmission mechanism, and the sensor produces a corresponding change in shape or position after the force is applied. This change will cause the sensor to output a changing amount of electricity, while This change can be accurately detected by electronic meters. After a certain conversion, the weight of the load can be displayed in digital form.
How mechanical load cells work?
Mechanical electronic scales generally use Hooke's principle to make spring scale dial scales or pointer scales. In the past, there were also kitchen scales made using Roberwell's principle.
Load Cells for Electronic Scales.
Electronic strain-type load cells are mostly used. Electronic strain-type load cells are attached to a special elastic body beam. After the weight is pressed, the elastic body is deformed, and the resistance strain gauge is also deformed. The measured weight The size of , is converted into the change of the strain variable, and the resistance value changes. It is the bridge measuring circuit composed of four walls that breaks the balance, and the output voltage obtains the voltage value. It has a good linear relationship, strong resistance to lateral eccentric load and lateral eccentric load, and small error at four corners. These applications are widely used in force measurement.
Material selection of load cell of electronic scale.
The material selection of the load cell of the electronic scale, the use of high-quality elastomer aluminum alloy material is one of the keys to the electronic scale sensor. The weighing accuracy is required to be better than 0.03%F.S. Therefore, it is very important that the positive creep of the aluminum alloy material itself is less than 0.03FS. Only in this way can the comprehensive accuracy of the sensor be ensured. The most widely used aluminum alloy material for electronic scale load cells is M-2048 T8 1, which is obtained by processing under high temperature conditions. Its elastic modulus, strength, thermal expansion coefficient, hardness, linearity, creep , hysteresis and other data are more practical for the use of electronic scales.