|
|
|
|
|
| Solenoids Paper Processing |
|
|
 |
The need to control the moisture content of paper during manufacturing became an application for the BTA®, Rotary Actuator.
When wet paper pulp is laid down in the first stages of paper manufacturing, the removal of moisture to exacting standards is critical to the end product.
A manufacturer had used superheated steam sent down a series of ducts which were spaced over the moving pulp. The ducts cover a span of 8" wide by 6' long and are in banks of 5 or 6 ducts. At the bottom of each duct is a 5" wide damper fitted to a 1/2" diameter by 7' long stainless steel rod. The dampers are either controlled manually by cables or by air actuators as an operator views the pulp. There are also several sensors located along the path of the paper pulp which also measure the various properties of the pulp.
The paper manufacturer was looking for a way to remotely operate the dampers by electric control instead of the cables or air operators now in use.
The actuators were required to rotate the dampers from the closed position to an open position of 45° and varying points in between. The super heated steam flows through the ducts but were not under any pressure. Therefore, the load on the actuators was only that required to turn the damper. Since the damper is centered on the 1/2" diameter rod, the load is nearly all inertia.
Several things had to be considered in this application such as the temperature of the super heated steam, the corrosive and abrasive environment of the paper manufacturing process, the long distance of the remote controls, the control signals available and last but not least the variable positioning required.
After reviewing all of the above requirements, a Size 5 BTA coupled with a PWM controller would solve the problem. Since the environment was undesirable, the units would be placed within a NEMA enclosure along with the PWM controllers. The output shaft would extend through the back of the cabinet and be coupled to the shaft of the damper. The complete NEMA enclosure would contain all of the necessary power supplies and controls for the bank of the dampers. Various control lines and 110 AC would lead into the enclosure.
Completion of the design allowed the manufacturer to electrically and remotely control a difficult environment.
|
|
|
File Format Help
|
|
|
ZIP: Some files need to be unzipped. Unzip utilities available for download for Windows / Macintosh.
For technical difficulties with this page contact us here.
|
|
L260
|
|
|
|
|
