The structure and application of the tension control system is very important, it must be watched!
Tension control refers to the ability to permanently control the tension of raw materials as they are conveyed on the equipment. This control must be effective for any running speed of the machine, including acceleration, deceleration and uniform speed of the machine. Even in emergency stop conditions, it should be able to ensure that the cut object is not damaged. The tension controller is a system developed by a single-chip microcomputer or some embedded devices and peripheral circuits. It is a control instrument. It can directly set the tension value to be controlled, and then directly input the signal of the tension sensor as the tension feedback value. After the deviation is obtained through comparison, it is input to the controller such as PID for processing.
A typical tension control system is mainly composed of a tension controller, a tension reader, a tension detector, a magnetic powder brake and a clutch. Coil stationary magnetic powder clutches and magnetic powder brakes are automatic devices that control the input current and change the output transition. When the coil is not energized, the input shaft rotates, and the magnetic powder is pressed against the inner wall of the clamp ring under the action of centrifugal force, and the output shaft does not contact the input shaft. At this time, it is idling. When the coil is energized, the magnetic powder generates magnetic flux under the action of the magnetic lines of force, so that the output shaft and the input shaft become a rigid body and rotate, and a slip occurs when overloaded, which is the working state at this time. So as to achieve the purpose of transmitting torque.
In many industries of industrial production, winding control problems are often encountered. For example, in the production process of paper, textiles, plastic films, wires, printed materials, magnetic tapes, metal strips and wires, etc., the unwinding and coiling tension of the strips or wires is critical to the quality of the product. To this end, constant tension control is required That is, the product is subjected to good tension during the winding process, and remains unchanged from beginning to end. The stability of the tension control is directly related to the quality of the slitting product. If the tension is too large, it will cause the tensile deformation of the processed material; if the tension is too small, it will deform the layer-to-layer stress of the coiled material, causing uneven winding and affecting the processing quality. In the strip winding system, the tension control system occupies an important position, and it is quite complicated.
The tension controller also has a manual control function, which generally means that a certain amount of output can be manually given to the actuator by the tension controller (often the current of the motor); some tension controllers also have a roll diameter estimation function, which is generally used On the winding equipment, there are unwinding and rewinding; in addition, there is a taper adjustment function, which can directly set some of the winding taper required by the process inside the controller.
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