Column Type Load Cell

Column type load cell sensor,It is a measuring element. Using simulation and experimental methods, the percentage error of the direct output value of the bridge and the percentage error of the output after strain data fusion with neural network under various eccentric and oblique load conditions of different height column strain load cells are discussed.

Name: column sensor

Deformation: less than 0.5 mm

Purpose: Improve accuracy

Nature: Elastomer

Table of Contents:

1:Basic structure

2:Category ▪ Hollow column load cell sensor;

          ▪ Sector hollow column load cell sensor;

3:Ring torque principle

Basic Structure:

In the measurement process, gravity acts on the elastic body to produce deformation. This strain (positive or negative) is attached to the elastic body and the strain gauge is converted into an electronic signal. In addition to the indispensable strain gauges and elastomers, the sensor usually also includes a housing to protect the strain gauges, sealing elements, etc.

The figure shows the cross section of the elastomer of the column sensor. The picture on the left is suitable for compressive loads, and the picture on the right can withstand tensile and compressive loads through the threaded rod connected to it. Where the strain gauges are pasted, the cross-section of the column is reduced, which creates a large enough strain to obtain accurate results. The deformation of the entire elastic body is very small, therefore, this type of sensor is under rated load.

Column Load Cell sensor Structure

Classification

Hollow column load cell sensor

The upper part of the elastic body is welded and connected with the protective shell through two films. They are very rigid in the horizontal direction to prevent damage to the lateral force, and the measurement direction is very flexible, so that no horizontal component force is generated during the measurement process, and the circuit wiring is also led out from the protective ring through an air-tight glass conduit. In particular, a load cell sensor in a completely sealed package is formed. The strain gauge is not affected by external gas and liquid.

For sensors that measure extremely large loads, an elastic body of another shape is usually used, such as a hollow cylindrical shape or a tube shape. A square cylindrical shape is not suitable because it cannot obtain a uniform strain field that is conducive to strain gauge measurement. The picture shows a hollow cylindrical elastomer, which is relatively easy to manufacture and has extremely high resistance to lateral forces. And sealing is easy to achieve, but it is difficult to stick strain gauges.

Hollow Column Load Cell sensor

Sector Hollow Column Load Cell sensor

The hollow cylindrical elastic body has a load loading problem and has a relatively high hysteresis error. Therefore, in fact, the shape shown in the figure is often used. The hollow column is divided into multiple sectors to reduce the hysteresis, and the load is introduced through a fixed plate.

Sector Hollow Column Load Cell sensor 

Ring Torque Principle

Ring Torque Principle

It is usually necessary to reduce the overall height while improving the accuracy. An elastomer designed according to the ring torque principle can solve this problem. The axial load is introduced through the inner shell, and the sensor shell is self-supporting on the supporting surface. The relative displacement between the inner shell and the outer shell causes the ring between the inner shell and the outer shell to deform relative to the load. The sensor based on this principle can withstand very high lateral force.