20 ANDRITZ


DEPRAG SCHULZ


Pulp Paper & Logistics


Drive solutions for paper production


Stainless steel air-vane motors provide a versatile drive system for many of the challenging processes in paper making mills, being acid and heat resistant. PPL reports on those offered by Deprag Schulz


P


aper making machines have evolved into gigantic processes that present an


enormous challenge for machine builders because the individual components need to withstand extremely high loads under what are often corrosive conditions. Deprag Schulz GmbH based


at Amberg in Germany manufactures stainless steel air-vane motors are proved to be the optimum drives a range of these applications. In the stock preparation


process 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 repeatedly agitated. For this application, Deprag’s engineers have developed 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. These vane motors achieve 1.6 kW at a nominal speed of 4,500 1/min, 2.6 kW at a nominal speed of 3,500 1/min or 3.6 kW at a nominal speed of 3,000 1/min. Furthermore, they are available with stainless-steel gears with a ratio of 18.3 or 32.6


July/August 2017


The non-corrosive stainless-steel drive spindle of the Power Line motor is resistant to aggressive chemicals


and a stainless-steel adaptor plate.


Air motors can be used in a wide range 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


remote compressor causes the motor shaft to rotate. In the vane motor the rotor turns in an eccentric cylinder. The vanes held in the rotor slits are pushed against the edge of the cylinder wall by centripetal forces. This creates working chambers for the expanding air. The expansion of compressed


supply air changes 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 for a third of the size.


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