What Are The Detection Methods Of The Automatic Tension Controller?

1. The dancer type (Dancer Arm) tension detection method: it is an indirect tension detection method, which is essentially a position control. When the tension of the automatic tension controller is stable, the tension on the belt and the cylinder force are maintained. Balance so that the float roller is in the center position. When the tension changes, the balance between the tension and the cylinder force is destroyed, and the position of the floating roller will rise or fall. At this time, the swing lever will rotate around the M point and drive the float roller potentiometer to rotate together. In this way, the float roller potentiometer accurately detects the change of the position of the floating roller, and it will feed back the tension controller with the position signal, and the controller calculates and outputs a control signal to control the servo drive system to perform the deviation correction. Then the float rolls return to their original equilibrium position. Since the floating roller type tension detecting device itself is an energy storage structure, it has a good absorption buffering effect on a wide range of tension jumps by using its own residual action, and can also reduce the eccentricity (ellipse) and speed of the coil. The effect of changes on tension. This system requires a small cylinder friction coefficient, fast response, and stable air supply. The weight of the float roller and the swing bar should be light and the rotation should be flexible.

2. Tension sensor (load cell) measurement method: it is a direct detection of tension, closely combined with the machine, no moving parts detection method. Usually two sensors are paired and mounted on the end shafts on both sides of the detection guide roller. The strip applies a load to the guide roller to cause displacement or deformation of the sensor sensor of the tension controller, thereby detecting the actual tension value, and converting the tension data into a tension signal for feedback to the tension controller. Realize tension closed loop control. There are many types of elastic sensors on the market, such as leaf spring type micro-displacement tension sensors, strain gauge tension sensors (such as Italian RE CF series) and pressure magnetic tension sensors (such as Italian RE CB pillow series). The advantage is that the detection range is wide, the response speed is fast, and the linearity is good. The disadvantage is that the peak of the tension cannot be absorbed, and the mechanical acceleration and deceleration is difficult to handle, and it is not easy to realize high-speed switching of the volume. Therefore, when the tension controller system in equilibrium is subjected to strong interference, the system can't react in an instant, and the amplitude of the tension change on the strip will be large, which is unfavorable for the tension control to re-enter the equilibrium state as soon as possible.

3. Floating roller / feedback composite tension detection mode: It can simultaneously detect the floating roller position signal output by the floating roller potentiometer and the tension signal output by the tension sensor, thereby providing higher precision tension control to the system. Its characteristics are: it not only has the absorption or buffering function of the floating roller control for a wide range of tension jump, but also has a good buffering and smoothing effect on the machine acceleration and deceleration, and it is easy to realize high-speed switching of the volume. High precision and high repeatability of closed-loop control of tension sensor.