Basic principles of checkweighers and application of professional knowledge
Basic Principles and Application of Professional Knowledge Checkweighers belong to tension and pressure sensors, which are commonly used in static data measurement and dynamic measurement. 1. The definition of the checkweigher fully considers the gravitational acceleration (g) of the application address and the buoyancy (f) of the gas water, according to the conversion of one of the measurands (quality) into another measurand (output) force sensor to measure quality. 2. The basic concept of checkweigher Polyurethane elastomer (vibration isolator, more sensitive beam) causes elastic deformation under external force, so that the resistance strain gauge (transformation component) pasted on its surface also causes deformation, resistance strain gauge After the deformation, its resistance value will change (expand or decrease), and then the resistor will be converted into an electronic signal through the relative 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 inspection power supply circuits are many key parts that cannot be lacking in resistance strain gauge checkweighers. These three levels are briefly described below. 1. Resistance strain gauge The resistance strain gauge is a piece of electrical heating wire mechanical equipment spread over a substrate made of organic materials, that is, a resistance strain gauge. One of his key main parameters is the dexterity index K. When his two sides are subjected to F force, it may stretch, in other words cause deformation. Assuming that it is stretched, its cross-sectional area becomes smaller, that is, its cross-sectional circular semicircle decreases. The relationship between the resistance elastic coefficient of the resistance strain gauge (the relative change of the resistor) and the elongation of the heating wire (the relative change of the length and the short) is proportional. It must be pointed out that the size of the K value of the sensitivity index is a parameter determined by the characteristics of the raw material for making the metal 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 in the The middle of 1.7-3.6; the second K value is a dimensionless quantity, that is, it has no dimension. In engineering mechanics, ΔL/L is called the strain force, denoted as ε, and it is often used to indicate that the ductility is very large, which is very inconvenient. It is often used as one millionth of the enterprise, denoted as με. 2. Polyurethane elastomer Polyurethane elastomer is a part with a unique appearance. It has two functions. First, it bears the external force of the checkweigher, which causes a recoil force to achieve a relative balance; The resistance strain gauge attached to this area is ideal for the daily task of transforming the strain force and electronic signal. 3. Inspection of the power supply circuit The function of the inspection of the power supply circuit is to change 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 harm of temperature change, to suppress the influence of side force, and to easily deal with the compensation problem of the checkweigher, the Wheatstone bridge has won the 1st place in the checkweigher. universal use. Due to the high sensitivity of the arm bridge circuit such as the full accumulation and release chain, the main parameters of each arm are the same, and the hazards of various influences are very easy to offset each other. Therefore, the checkweigher adopts the full accumulation and release chain and other arm bridge circuits.
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