SQC cantilever beam sensor SQC-1T load sensor

Description :

　　SQC cantilever beam sensor SQC-1T load sensor detailed description:

　　Measuring element

　　Transform the output of the transformation element into an electrical signal, providing convenience for further transmission, processing, display, recording, or control. Such as the bridge circuit in resistance strain type weighing sensors and the charge preamplifier in piezoelectric weighing sensors. auxiliary power supply

　　Provide energy for the electrical signal output of the sensor. Generally, weighing sensors require an external power supply to operate. Therefore, as a product, it must indicate the power supply requirements, but not as a component of the weighing sensor. Some sensors, such as magneto electric speed sensors, can function normally without the need for an auxiliary power supply due to their high output energy. So not all sensors need to have an auxiliary power supply.

　　principle

　　The resistance strain type weighing sensor is based on the principle that an elastic body (elastic element, sensitive beam) undergoes elastic deformation under external force, causing the resistance strain gauge (conversion element) attached to its surface to also deform. After the resistance strain gauge deforms, its resistance value will change (increase or decrease), and then the corresponding measurement circuit will convert this resistance change into an electrical signal (voltage or current), thus completing the process of converting external force into an electrical signal.

　　From this, it can be seen that the resistance strain gauge, elastic body, and detection circuit are essential components of the resistance strain type weighing sensor. Below is a brief discussion on these three aspects.

　　1、 A resistance strain gauge is a strain gauge made by mechanically distributing a resistance wire on a substrate made of organic material. One of his important parameters is the sensitivity coefficient K. Let's introduce its significance. There is a metal resistance wire with a length of L, a circular cross-section with a radius of r, an area denoted as S, and a resistivity denoted as ρ. The Poisson's coefficient of this material is μ. When this resistance wire is not subjected to external forces, its resistance value is R: R=ρ L/S (Ω) (2-1). When its two ends are subjected to F force, it will elongate, that is, deform. Assuming its elongation Δ L, its cross-sectional area decreases, that is, its cross-sectional circle radius decreases Δ r. In addition, it can be experimentally proven that the resistivity of this metal resistance wire will also change after deformation, denoted as Δ ρ.

　　2、 Elastic body is a structural component with a special shape. It has two functions. Firstly, it can withstand the external force acting on the weighing sensor, generate a reactive force on the external force, and achieve relative static equilibrium; Secondly, it needs to generate a high-quality strain field (zone), so that the resistance strain gauges pasted in this zone can ideally complete the task of converting strain to electrical signals. Taking the elastic body of a weighing sensor as an example, let's introduce the stress distribution.

　　There is a rectangular cantilever beam with blind holes.

　　The bottom center of the blind hole is subjected to pure shear stress, but tensile and compressive stresses will occur in its upper and lower parts. The direction of the principal stress is tension and compression. If a strain gauge is attached here, the upper half of the strain gauge will be stretched and the resistance will increase, while the lower half of the strain gauge will be compressed and the resistance will decrease. The strain expression of the center point at the bottom of the blind hole is listed below, without further derivation.

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