The document provides information on Wynveen International BV, a manufacturer of hammer mills and other equipment for the animal feed industry. It discusses Wynveen's hammer mill designs which feature adjustable breaker plates, variable speed drives, and automatic screen change systems, allowing for energy savings. The latest GHM hammer mill model has a 1200mm diameter grinding chamber for grinding a variety of materials at 1500 RPM. Wynveen hammer mills are available in various capacities from 2-60 tons per hour.

1. March | April 2012
Feature title: Grinding by a proven concept, makes your choice simple
International Aquafeed is published five times a year by Perendale Publishers Ltd of the United Kingdom.
All data is published in good faith, based on information received, and while every care is taken to prevent inaccuracies,
the publishers accept no liability for any errors or omissions or for the consequences of action taken on the basis of
information published.
©Copyright 2012 Perendale Publishers Ltd. All rights reserved. No part of this publication may be reproduced in any form
or by any means without prior permission of the copyright owner. Printed by Perendale Publishers Ltd. ISSN: 1464-0058
The International magazine for the aquaculture feed industry

2. FEATURE FEATURE
using the same screen perforation. When of all four corners of the hammers, and reduce
using a high speed you are able to create fine the downtime of the machine , the direction
grinding, while with a lower speed a more of rotation of the hammer mill can be changed
coarse grinding is achieved. and the rotor has double holes for the hammer
To answer the growing need axles. To ensure a good product entrance to
for producing a great number the mill , a feeder is developed which contains
Grinding by a proven concept
of recipes, the screens need an integrated , automatically cleaned magnet
to be changed frequently, for and a stone trap. This will make sure that pos-
which reason Wynveen has sible metal parts and/or stones are prevented
makes your choice simple designed the GHM version with
an optional automatic screen
to end up in the feed mix. The combination of
the two makes the feeder unique .
by Mr Willem de Vaan, General director change system. This gives more To meet the stringent and latest guidelines
at Wynveen International BV, The Netherlands possibilities to grind on various of CE regulations , Wynveen International BV.
perforations without the need has conducted a risk analyses for its hammer
T
to stop the motor during pro- mills. This has be done for both non hazard-
ogether with mixing and pelleting, their new website, introduced during duction and loose a lot of production time. ous environments and ATEX environments.
grinding is one of the important the opening of the new building, one Wynveen has chosen to make use of the To meet both as a standard , the hammer
processes when producing animal can see in a glance what capabilities can sec. The length of ergonomic design already available at the ham- mills are equipped with proper earthing and
feed. Traditionally hammer mills are be offered. Feel free to visit it: www.wynveen. the chamber can vary from mer mills with manual screen exchange, which sensors to detect possible increase of heat.
used in the feed industry for grinding raw com. 750 to 1250mm, depending on the means a horizontal movable screen cassette Where required we make use of a pressure
materials , which is mainly caused by the Besides the design and delivery of complete required capacity. The low speed gives a lower in which four screens (so also four different release membrane and/or flame arrestors. For
relatively simple construction and high varia- turnkey feed mills, Wynveen International BV noise level, less wear and tear and lower bearing perforations selectable) are mounted. reducing the noise and vibration our hammer
tion in particle reduction compared to other is manufacturing the main equipment like load compared to a 3,000 rpm hammer mill. The big advantage versus vertical screen mills are provided with shock absorbers. Much
techniques used at roller mills and crackers. hammer mills, mixers, coater, sifters and con- To suit the various demands in feed mill exchange is the space needed. Often an upper attention was spent to the ergonomic aspect.
veying equipment. capacities, Wynveen International BV. can hopper is positioned above the hammer mill, By designing two big doors, the hammer mills load on the filter cloth of approximately 2 m3/
Roller mills and crackers showed better Wynveen International BV. is manufacturing deliver hammer mills that can deal with differ- which reduces the possibilities for vertical screen are very easy accessible for screen and hammer min of air per m2 of filtering area.
results when it comes to energy consumption, hammer mills in a wide range. The features of ent capacities from two t/h up to 60 t/h. For exchange. To avoid dust and waste of product dur- exchange. Both doors easily roll sideways via a Finally it is impor tant that the filter unit
but the new designed mills feature adjustable the of hammer mills that can be delivered are: the smaller capacities the 3,000 rpm versions ing exchange of the screen, while the motor is still rail and wheels and are equipped with safety is not directly positioned beside the outlet
pre- breaker plates , variable speed drives and • Big diameter 1200 mm - 1500 rpm are still used. In Table 1 you will find the running, it is important to maintain an under pressure switches to make sure that no mistakes can be product stream of the hammer mill to make
automatic screen change systems. This results • Diameter 650 mm - 3000 rpm various possibilities. By introducing frequency in the grinding chamber of the hammer mill. Special made during maintenance . sure that a good airflow and aspiration is
in an energy saving which brings the hammer • Capacities from two t/h up to 60 t/h control on the motor, it became possible to inflatable sealings with labyrinth ensure a correct Other important points to keep in mind safeguarded. ■
mill again in a favoured position, certainly • Frequency controlled drives grind ideal structures and particle size. In fact tightness of the sealing in operation and prevents when designing
when taking in consideration the relatively • Manual or automatic screen exchange you can create a new screen set-up but still that product can leave the grinding chamber. a grinding plant
high costs for wearing parts on roller mills • With or without adjustable breaker To minimise energy consumption adjust- are not only the
and crackers. Given the fact that a hammer plates able breaker plates are introduced. Test have right choice of Your partner in technology,
mill also allows grinding of mixed products, • Two directions of rotation possible proven that hardly any grinding takes place hammer mill , but equipment and plants for
it becomes clear that Hammer mills still are • Motor capacities up to 400kW below the level of the main shaft . By designing also the correct
animal- and aqua feed and
the majority. • Open rotor design two adjustable breaker plates in the top of the energy efficient
Wynveen International BV. has a rich • Temperature control on main bearings machine, an energy saving of approximately motor type and petfood.
tradition in manufacturing of machines and and chamber 30 – 35 percent compared to the old designs very important
equipment for the animal feed industry, pet • Feeder with magnet and stone trap has been achieved. The lower part of the ham- , an adequate
food industry and fish indus- • Ergonomic design mer mill is executed with screens ; by making aspiration set-up.
try. Recently they have moved Already five years ago the Wynveen ham- use of the gravity force a good discharge of Especially the
into their new premises which mer mill got a complete makeover. This with product is possible. The idea of adjustable last item needs
means a doubling of the office the idea to develop a hammer mill that will be breaker plates was to create an asymmetric special attention.
and production floor compared prepared for the future and can deal with the form (ellipse instead of circle) in the grinding The capacity of
to the old building. With this new office challenges of the future. This means minimal chamber. Because of this the product is forced the aspiration
Wynveen International BV is prepared of the energy consumption and the possibility to to leave their natural flow and , because of fan should not
future and has made the logical next step to answer to the need of the various applications the centrifugal force the product will hit the only be in the
meet the growth they are aiming for. With required in nowadays feed mills. Most animal breaker plate, as a result it is bounced back and right relation to
feed mills are looking for then again gets a hit of the hammer. So a more the screen area
table 1: a grinding concept that frequent frontal collision is achieved between of the mill but
Diameter length can produce the particle hammers, breaker plates and product. By mak- also depends
type Capacity t/h* rPM
Chamber Chamber size that fits with the spe- ing the breaker plates adjustable we can create on products
cific required coarseness this ellipse in both directions. which have
450-150 1-2 450 150 3000 of ingredients needed for The hammer mills of Wynveen International to be ground.
650-275 2-3 650 275 3000 the feed to produce. B.V allow a drive motor up to 400kW. Depending on
650-375 3-5 650 375 3000 The latest version of 1 Magnet Furthermore a so called open rotor has been the air volume,
650-550 7 - 12 650 550 3000 the Wynveen hammer 2 Air inlet designed with two functions. One is to create the necessary
670-750 15 - 20 650 750 3000 mills type GHM has a 3 Stone trap sufficient stiffness and balance and secondly filter surface can
670-1150 20 - 30 650 1150 3000 grinding chamber diameter 4 Material direction flap to minimise the temperature increase while be determined. In Wynveen International bv info@wynveen.com
5 Pre braking plates
GHM-750 20 - 35 1200 750 1500 of 1200mm, which gives at grinding. For monitoring purposes the main general, reverse P.O. Box 38 www.wynveen.com
6 Temperature sensor
GHM-1000 30 - 50 1200 1000 1500 a speed of only 1,500 rpm. 7 Screen bearings and the chamber are executed with air cleaned filters 6666 ZG Heteren Tel: +31 (0)26 479 06 99
GHM-1250 45 - 60 1200 1250 1500 a hammer tip speed at the 8 Rotor met beaters temperature sensors. All components can also are used, which The Netherlands Fax: +31 (0)26 479 06 98
*= depending on raw materials ideal level of approx. 90 m/ be delivered in an Atex execution. To make use allow for an air
20 | InternatIonal AquAFeed | March-april 2012 March-april 2012 | InternatIonal AquAFeed | 21

3. 18 | InternatIonal AquAFeed | March-april 2012

4. This digital re-print is part of the March | April 2012 edition of International Aquafeed magazine.
Content from the magazine is available to view free-of-charge, both as a full online magazine on our
website, and as an archive of individual features on the docstoc website.
LINKS
Please click here to view our other publications on www.docstoc.com.
Vo l u m e 1 5 I s s u e 2 2 0 1 2
• See the full issue
• Visit the International Aquafeed website
Filtration in recirculation
particle control
Fish Protein Hydrolysates
– FPH enhance resistance of aquaculture species to
different types of stress
• Contact the International Aquafeed Team
The quest to keep Salmon
in the pink naturally
Aquaculture development in
• Subscribe to International Aquafeed
Sub-Saharan Africa
the international magazine for the aquaculture feed industry
To purchase a paper copy of the magazine, or to subscribe to the paper edition please contact
our Circulation and Subscriptions Manager on the link above.
INFORMATION FOR ADVERTISERS - CLICK HERE
www.aquafeed.co.uk