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Fibres are dissolved in water and scooped out with a sieve. This paper web is later pressed and dried. Today gigantic paper machines are used in the various processing steps to turn the pulp into paper. Paper manufacture – this is an enormous challenge for machine builders, as individual components need to be able to withstand extreme pressures. DEPRAG SCHULZ GMBH u. CO. in Amberg, Germany manufactures stainless steel air vane motors which have proven to be the optimal drive solution for numerous areas of application.

In stock preparation for paper machines for example: pulp and wood pulp as well as waste paper fibres are mixed in a certain proportion depending on the type of paper, and then dissolved in water. Chemical bulking agents and additives are also added. This aggressive liquid must be ”agitated” repeatedly. For this application, the engineers have developed DEPRAG POWER LINE air motors with acid-resistant stainless steel housing made from V4A material. The high quality non-corrosive stainless steel drive spindle is resistant to aggressive chemicals. It has a particularly robust radial shaft sealing. The POWER LINE vane motors achieve 1.6 kW at a nominal speed of 4500 1/min, 2.6 kW at a nominal speed of 3500 1/min or 3.6 kW at a nominal speed of 3000 1/min. Furthermore, they are available with stainless steel gears with a gear ratio of 18.3 or 32.6 and a stainless steel adaptor plate.

Air motors can be used in a wide spectrum of applications due to their diverse range of designs, simple construction, light performance weight, high speed ranges and explosion safety. The air motor works on a simple principle. The air created by the compressor causes the motor shaft to rotate.

In the vane motor: the rotor starts to turn in the eccentric cylinder. The vanes held in the rotor slits are pushed against the edge of the cylinder wall by centrifugal force. This creates working chambers for the expanding air. The expansion of compressed supply air changes the compressed air into kinetic energy and rotational movement is generated.

There are many advantages to using air motors as a drive. The main benefit is the high performance density. Depending on design they only need a fifth of the weight of a standard electric motor or a third of the size.

The performance generated is almost constant for this motor type over wide speed ranges. It can be operated over a wide range of varying loads. The motor performance can be adapted by altering the operational pressure and the speed can be smoothly controlled by throttling the air quantity. The air motor can be loaded until standstill without problems or any kind of damage. After the load has been reduced, it restarts immediately and successively as many times as required even on high duty cycles.

More information: DEPRAG SCHULZ GMBH u. CO.