Basic concepts and application professional skills of weighing machine
Weighing machine is a pull level sensor, it is more common in data format accurate measurement and dynamic accurate measurement. 1. The definition of weighing machine takes into account the damage of gravity acceleration (g) and vapor buoyancy (f) using the detailed address, according to which one is accurately measured (mass) is converted into another A force sensor that is accurately measured (output) to accurately measure mass. 2. The basic element of the weighing machine Polyurethane elastomer (vibration isolator, more sensitive beam) causes elastic deformation under the action of external force, so that the resistance strain gage (conversion electronic device) pasted on its surface also causes deformation. After the resistance strain gauge is deformed, its resistance will cause a change (expansion or decrease), and then the relative precision measurement circuit will convert this resistance change into an electronic device data signal, thereby completing the conversion of the external force into an electronic device data signal The whole process. It can be seen that the resistance strain gauge, the polyurethane material polyurethane elastomer and the detection circuit are several important parts that cannot be lacked in the resistance judgment force weighing machine. The following is a brief discussion on these three aspects. 1. Resistance strain gauge Resistance strain gauge is a piece of resistance strain gauge that spreads a piece of heating wire industrial equipment on a wall or material made of organic material, that is, it becomes a piece of resistance strain gauge. One of his important basic parameters is the smart index value K. When F force acts on his sides, it is likely to bend and stretch, that is to say, it will cause deformation. Assuming its flexion and extension, its cross-sectional area is reduced, that is, its cross-sectional circle radius is reduced. The resistance elastic coefficient (relative change in resistance) of the resistance strain gauge and the tensile strength of the heating wire (relative change in length) are in the occupancy ratio. It is important to note that the sensitivity index value K value is a parameter that is determined by the characteristics of the raw material for the production of metal composite heating wire. It has nothing to do with the appearance, specifications, and specifications of the resistance strain gauge. The K value of different raw materials The value is generally in the middle of 1.73.6; secondly, the K value is a dimensionless quantity, that is, it has no dimension. In the mechanical foundation, ΔL/L is called judgment, and it is recorded as ε. It is used to explain that plasticity generally looks very large and inconvenient. One millionth of it is often regarded as a company and recorded as με. 2. Polyurethane material Polyurethane elastomer Polyurethane material Polyurethane elastomer is a unique part. It has two functions. The first is that it bears the external force suffered by the weighing machine, and the external force causes the reaction force to ensure relative balance; secondly, it leads to a high-quality judgment force field (zone), so that it can be pasted here. The resistance strain gages are more rational to carry out the daily tasks of judgment and data signal conversion of electronic devices. 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 the ability to suppress the damage caused by temperature changes, the side force hazard, and the easier and faster solution to the payment difficulties of the weighing machine, the Wheatstone bridge is used in the weighing machine. Has been widely used. Because of the greater sensitivity of the full-stack and other-arm bridge circuit, the basic parameters of each arm are the same, and various hazards can easily offset each other. Therefore, the weighing machine adopts the full-stack and the same Bridge circuit.
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