This article describes the characteristics of the torsion ring load cell sensors.
The load cell, with the load cell, has the same working principle, but the object and measurement requirements are different, especially for small-range measurement.
Force measurement requires force measurement. The force line of force measurement is coaxial with the sensor. Therefore, most of the load cell adopts spoke type, torsion ring type, column type and other structures. In some occasions, S-type sensors can be used instead.
Because the twisted ring type can be used in high-altitude spaces, it is mostly used in precision machinery and testing occasions. Below, a brief description of the structure and working principle of the twisted-ring load cell will facilitate the correct selection, such as range, signal processing, etc., to avoid unnecessary measurement errors and the resulting product quality problems.
We can judge whether the design and technical parameters of the sensor meet the requirements of use from the following aspects:
Metal elastomer: It looks like just a metal, but this is the force carrier. The material of the elastomer is the reliable guarantee of the sensor's strength, durability, zero point, linearity, creep resistance, overload resistance, and other technical performance.
Simple test method: keep the force for 30 minutes, after unloading, observe the zero recovery speed and zero return time.
Fixed screw hole: Whether there is a fixed screw hole, the screw hole on the micro sensor not only requires metal material, but also greatly increases the processing difficulty, especially the processing of 17-4PH stainless steel.
Force end point R: This is a landmark distinction. Ordinary machining is a simple plane without arc surface. In this way, the consistency of the force cannot be guaranteed at all, and the arc tangent point cannot be force. The force pressure varies with the change of the force surface.
Height and diameter: Due to the miniature sensor, the volume of the metal elastomer is limited, the size of the force will directly affect the metal carrying capacity.
Some manufacturers reduce the height by increasing the diameter, so that the force is prone to resonance, and the long-term load is also prone to yield damage. Generally, the ratio of diameter to height is about 2:1. The difficulty of production is judged by the diameter φ10. The production difficulty is greatly reduced if the diameter is above φ20. Because the strain gauge is relatively simple to make.
Strain gauge: only imported products with diameter below φ10. φ20 can be replaced by domestic products. Therefore, the diameter of the sensor is also a typical mark for judging the manufacturing capability of the sensor.
working principle:
The elastic body deforms under force, and the resistance strain gauge (four pieces of Wyethden bridge) pasted on the elastic body deforms, the resistance value changes, and the bridge loses balance. Because the excitation voltage is a constant value, the signal end is balanced accordingly Voltage.
Measuring principle:
The sensor signal processor, after low-pass filtering, amplification, and analog/digital conversion, processes the original voltage signal into a standard analog signal that can be measured or a digital signal that can be calculated.
Outlet hole: The protection of the outlet hole indicates the quality of the sensor cable. If it is a high-quality cable that is anti-breaking, no protection device is needed, which affects the strain of the elastic body.
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