How To Get A Clearer Picture Of The Tension Control System?

Definition of tension control system:
It is a system integration of tension sensor and tension controller, mainly used in metallurgy, paper, film, dyeing and finishing, weaving, plastic, wire and other equipment, is a kind of automatic control system to achieve constant tension or taper tension control, its role is mainly to achieve synchronization between the rolls, winding and unwinding uniform control.

The working principle of tension control system:
It includes acceleration, deceleration and even speed of the machine. If the tension is not enough, the raw material deformation is excessive; if the tension is too large, the raw material is easy to be pulled off.
A typical tension control system is mainly composed of tension controller, tension reader, tension detector, brake and clutch. According to the loop can be divided into open-loop, closed-loop or free-loop tension control system; according to the monitoring of different coils can be divided into ultrasonic type, floating roller type, tracking arm type.

Tension control system control mode:
1, manual control, in the receipt, discharge or process of continuous adjustment of the clutch or brake torque, so as to obtain the required tension, which requires the user must always check the tension of the controlled material at any time, at any time to adjust the output torque, if you use a pneumatic brake or clutch, the manual controller can be directly selected from the precision regulator, which allows the user to save a certain amount of equipment costs, but only applies to a number of low-speed composite machines, Extruder, textile machinery and other tension control requirements are not high occasions.
2, semi-automatic way: the use of ultrasonic principles and other automatic detection of the volume diameter, so as to adjust the roll tension, for example: the United States Montalvo (Montefiore) company U3500 ultrasonic tension controller, in essence, is a kind of tension semi-closed-loop control, not only can automatically measure the volume of the warping, control the torque output, but also has a buffer to start the anti-loosening of the volume and inertia compensation and other functions. The program's implementation cost is low, so in the mid-range machinery is widely used.
3, full-automatic way: generally there are also two detection methods. One is through the tension sensor to determine the tension of the coil, and then the controller automatically adjusts the clutch or brake to control the coil tension. This way is the tension of the full closed-loop control, in principle, this program can reflect the changes in real-time tension so the highest control accuracy, so some high-grade finishing mill, high-speed slitting machine and other metallurgical use of fully automatic tension control system.

Tension control system of attention:
1. Installation precautions
a. Pay close attention to avoid installation deviation in installation
(1) The tightening of the gland should be carried out after the coupling is squared, the bolts should be evenly supported to prevent the end face of the gland from being skewed, and the points should be checked with a plug ruler, and the error should not be more than 0.05 millimeter.
(2) Check the fit clearance (i.e. concentricity) between the gland and the outer diameter of the shaft or bushing, which should be even all around, and the tolerance at each point should be no more than 0.01 mm when checked with a plug ruler.
b. Spring compression should be carried out in accordance with the regulations, not allowed to have too large or too small phenomenon, the required error 2.00 mm. Too big will increase the end face specific pressure, another speed end face wear. Too small will cause the pressure is not enough to play the role of sealing.
c. After the installation of the dynamic ring beard to ensure that the shaft can move flexibly, the dynamic ring pressure to the spring should be able to automatically spring back.
2. Precautions when disassembling
a. When disassembling the mechanical seal, be careful, prohibit the use of hand hammer and flat shovel, in order to avoid damage to the sealing element. Can make a pair of steel wire hooks, in the direction of the pair of self-propelled into the drive seat notch, the sealing device to pull out. If scaling can not be dismantled, it should be cleaned before dismantling.
b. If both ends of the pump with mechanical seals, in the assembly, disassembly process to take care of each other, to prevent loss of care.
c. For the operation of the mechanical seal, where there is a loose gland so that the seal to move the situation, the static and dynamic ring parts must be replaced, should not be re-tightened to continue to use. Because in the kind of carpets move, the original running track of the friction vice will change, the sealing of the contact surface is easy to be damaged.

Common applications of tension control systems:
Common printing tension control system generally consists of magnetic particle brake, tension controller, magnetic particle clutch, tension sensor, motor and other equipment. In the printing transmission system, with the same active shaft drive two printing components, feeding and rolling components, so that the components to achieve a strict synchronization of transmission, the paper belt can basically maintain a stable go paper force. But because the printing materials and process conditions vary, just rely on transmission synchronization can not let the paper belt tension always remain stable and consistent. From the following circumstances can change the paper belt tension of the printing machine: 1, change the connection of the new paper roll, so that before and after the connection of the paper belt tension is different. 2, the paper roll has a significant degree of roundness, in the rotation of the radius of the simultaneous changes in the use of the paper belt is not stable. 3, changes in the printing speed will also make the change in the paper belt tension. The greater the printing speed, the greater the paper tape tension, the slower the printing speed, the smaller the paper tape tension. 4, the uneven tightness of the paper roll will also affect the stability of the tension. 5, in the printing process, the paper roll slowly from large to small.

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