The principle of a tension sensor is based on a load cell, using two tension transmission components to transmit force. The internal structure of the force sensor consists of a piezoelectric plate pad fixed to one side of the piezoelectric plate in the center area of the piezoelectric plate, and a piezoelectric substrate located between the other edge and the force transmission component, close to the piezoelectric plate.
Tension sensors can be classified into strain gauge type and micro-displacement type according to their working principle. This article mainly introduces strain gauge type tension sensors.
★ Facilitates the replacement and installation of bearings and tension rollers;
★ Built-in new mechanical 10x overload protection structure;
★ It exhibits minimal temperature drift, good linearity, and repeatability;
★ Robust, error-prone connections ensure long-lasting reliability;
★Drilling and tapping can be performed according to customer requirements;
★ It can eliminate interference from other forces, improving accuracy by measuring only tension.
A strain gauge type tension sensor consists of a tension strain gauge and a compression strain gauge connected together using a bridge circuit. The resistance value of the strain gauge changes with the external pressure, and the amount of change depends on the magnitude of the pressure.
The micro-displacement tension sensor works by applying an external load to the leaf spring, causing it to displace, and then detecting the tension through a differential transformer. Because the displacement of the leaf spring is extremely small, it is called a micro-displacement tension detector.
Tension sensors with different shapes have been designed based on the strength and size of different tensile forces, such as S-shaped tension sensors and plate ring tension sensors.
S-type tension sensors are commonly used mechanical sensors for measuring the tension and pressure of solids. They are often called tension and compression sensors because they look like an S-shape.
Most tension sensors adopt a three-wheel structure. To avoid affecting the operation of the cable, the design is robust and compact, resulting in good measurement repeatability, high accuracy, and easy installation, all thanks to the three-wheel design. Furthermore, the mobility of the center wheel facilitates installation and operation.
Typically, installing a tension sensor involves selecting a guide rail or shaft at the location where the film tension needs to be detected. The bearing housings at both ends of the shaft are then fixed to the tension sensor, and finally, the base of the tension sensor is secured to the machine. Spherical universal bearings are used to prevent interference between the left and right sensors.
