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Author: Smartweigh–Multihead Weighter
Multihead weigher is a pull liquid level sensor, which is more common in data format accurate measurement and dynamic accurate measurement. 1. The definition of multihead weigher takes into account the damage of gravity acceleration (g) and vapor buoyancy (f) using the detailed address, and is based on converting one of the accurately measured (mass) into the other one Precise measurement (output) A force sensor for precise mass measurement. 2. The basic elements of multihead weigher Polyurethane material Polyurethane elastomer (vibration isolator, more sensitive beam) leads to elastic deformation under the action of external force, so that the resistance strain gauge (conversion electronic device) pasted on its surface also leads to deformation, resistance After the strain gauge is deformed, its resistance value will cause a change (expansion or decrease), and then this resistance change will be converted into a data signal of an electronic device through a relatively accurate measurement circuit, thus completing the transformation of the external force into a data signal of the electronic device. the whole process.
It can be seen that the resistance strain gauge, polyurethane material polyurethane elastomer and detection circuit are several important parts that cannot be lacking in the resistance judgment type multihead weigher. These three aspects are briefly discussed below. 1. Resistance strain gauge The resistance strain gauge is a piece of resistance strain gauge that spreads a heating wire industrial equipment on a wall or material made of organic materials.
One of his important basic parameters is the alertness index value K. When his two sides are subjected to F force, it is likely to flexion and extension, that is to say cause deformation. Assuming its flexion and extension, its cross-sectional area is reduced, that is, its cross-sectional circle radius is reduced.
The resistivity elasticity coefficient (relative change of resistance) of the resistance strain gauge and the tensile strength (relative change of length) of the heating wire are positively related to the occupancy rate. It must be noted that the specification of the sensitivity index value K value is a parameter that is managed and decided by the characteristics of the raw material for making the metal composite heating wire. It has nothing to do with the appearance, specification, model and specification of the resistance strain gauge. The value is generally 1.7—3.6 Middle; secondly, the K value is a dimensionless quantity, that is, it has no dimension. In the mechanical foundation, ΔL/L is called judgment, denoted as ε, and it is used to illustrate that plasticity generally seems to be very large, which is very inconvenient, and one millionth of it is often used as a company, denoted as με.
2. Polyurethane material Polyurethane elastomer Polyurethane material Polyurethane elastomer is a component with a distinctive appearance. It has two functions. In the beginning, it is responsible for the external force suffered by the multihead weigher, and the external force causes a reaction force to ensure relative equilibrium; The resistance strain gauge is more rational to carry out the daily task of the conversion of the data signal of the electronic device. 3. Detection circuit The function of the detection circuit is to convert the resistance change of the resistance strain gauge into a working standard voltage output.
Because the Wheatstone bridge has many advantages, such as it can suppress the damage of temperature change, can suppress the side force damage, and can solve the compensation difficulty of the multihead weigher more conveniently and quickly, so the Wheatstone bridge has been obtained in the multihead weigher. Wide range of applications. Due to the high sensitivity of the circuit of the full-stacking chain and other arm bridges, the basic parameters of each arm are the same, and various hazards can easily offset each other. circuit.
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