Basic principles and application expertise of checkweighers
The basic principle and application of professional knowledge of checkweigher. belongs to the tension and pressure sensor. It is commonly used for accurate measurement of static data and accurate measurement of dynamics. 1. The definition of checkweigher fully considers the hazards of gravity acceleration (g) and the buoyancy of gas and water (f) of the application address, according to which one is accurately measured (quality) is converted to another is accurately measured ( Output) to accurately measure the quality of the force sensor. 2. The basic concept of checkweigher machine. Polyurethane elastomer (vibration isolator, more sensitive beam) causes elastic deformation under external force, so that the resistance strain gauge (transformation component) attached to its surface will also cause deformation, resistance strain gauge After deformation, its resistance value will change (enlarge or decrease), and then the resistor will be converted into an electronic signal by a relatively accurate measurement power circuit, and then the whole process of converting the external force into an electronic signal is completed. It is not difficult to see that resistance strain gauges, polyurethane elastomers and test power circuits are many key parts that cannot be lacked in resistor strain force checkweighers. The following is a brief explanation of these three levels. 1. Resistance strain gauge The resistance strain gauge is a piece of electrical resistance strain gauge by spreading a piece of electrical heating wire mechanical equipment on a substrate made of organic material. One of his key main parameters is the dexterity index K. When both sides of him are subjected to F force, they may stretch, in other words cause deformation. Assuming it stretches, its cross-sectional area becomes smaller, that is, its cross-sectional circle is reduced by half. The elastic coefficient of the resistor of the resistance strain gauge (relative change of the resistor) and the elongation of the heating wire (the relative change of length and short) are proportionally related. It must be shown that the size of the sensitivity index K value is a parameter determined by the characteristics of the raw material for the metal material heating wire. It has nothing to do with the appearance and size of the resistance strain gauge. The K value of different raw materials is generally 1.73.6 Middle; secondly, the K value is a dimensionless quantity, that is, it has no dimension. In engineering mechanics, ΔL/L is called strain force and is recorded as ε. It is used to show that ductility usually looks very large and inconvenient. One millionth of it is often regarded as an enterprise and recorded as με. 2. Polyurethane elastomer Polyurethane elastomer is a unique part. It has two functions. The first is that it bears the external force of the checkweigher, and the external force causes the recoil to achieve relative balance; second, it creates a high-quality strain field (zone) to make The resistance strain gauges attached to this area ideally perform the daily task of transforming the strain force and electronic signals. 3. Checking the power supply circuit The function of checking the power supply circuit is to transform the resistor of the resistance strain gauge into a working voltage output. Because the Wheatstone bridge has many advantages, such as the ability to suppress the hazards of temperature transitions, the ability to suppress the influence of side forces, and the ability to more easily deal with the compensation problem of the checkweigher, the Wheatstone bridge has gained a reputation in the checkweigher machine. Universal use. Since the full-stack equal-arm bridge circuit has the greatest sensitivity, the main parameters of each arm are the same, and various impacts can easily offset each other, so the checkweigher machine selects the full-stack equal-arm bridge circuit.
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