siegling transilon

conveyor and processing belts

INCLINE- and SWAN-NECK
CONVEYORSRECOMMENDATIONSFOR CONVEYOR DESIGN➀

Incline conveyors
An incline conveyor has a horizontal belt segment at the bottom of the conveyor and a belt
segment rising at an angle. Goods are conveyed
upwards. It is usual to provide a head drive.
However, a tail drive can be provided insteadshould there be insufficient space around thehead drum.
The belt incorporates at least one counter-bend
due to the belt guides being in contact with thetop face.

Siegling – total belting solutions

Swan-neck conveyors
A swan-neck conveyor has a horizontal belt
segment at the bottom of the conveyor, a belt
segment rising at an angle and a further horizontal belt segment at the top of the conveyor.
Goods are always conveyed upwards. A tail drive
can be provided should there be insufficientspace around the head drum. The tension in thebelt should be kept low, as the concave changeof direction on the return side (1) is critical.
The belt incorporates at least two counter-bends
due to the belt guides being in contact with thetop face.

RECOMMENDATIONSFOR CONVEYOR DESIGN
Drive and endless splicing
In the case of incline and swan-neck conveyors, head drives
are used almost exclusively. The upper drum functions as
the drive drum and is provided with a friction lagging. The
motor should be designed for low acceleration because

otherwise many system components can be heavily loaded.
To achieve sufficient stiffness, stepped Z-splices or steppedoverlap splices should be used to create an endless belt.

Profiles and corner radii
It is often advisable to fit profiles to rising conveyor belts.
– Lateral profiles (1) ensure that goods do not slip
downwards.
– Sidewalls (2) ensure that goods do not slip off sideways.
– Central longitudinal profiles on the underside (3) ensurethat the belt does not run off-centre.
– Longitudinal profiles along the belt edges on underside(4) or top face (5) are necessary to maintain the width if
the lateral stiffness of the belt, including any welded
lateral profiles, is insufficient to keep the belt stable at theconvex bend.

➁➀

In these cases the minimum radii at changes of direction
and counter-bends depend not only on the type of belt,
but also on the profiles and sidewalls used.

➁(For details go to www.forbo.com/movement/en-gl >Downloads Siegling Transilon · Technical Information 2,Ref. no. 318-2.)

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2

Belt guides at concave bends
Idler rollers with various geometries are required to hold down thebelt edges at concave bends. The minimum width B is 30 mm ineach case:– Cylindrical rollers (5) for belts without longitudinal profiles on thetop face.

➄➅BB

➆

– Pulleys (6) or guide rollers (7) for belts with longitudinal (guide)
profiles on the top face.
For shallow or fixed conveyor angles, it is sufficient to install one
idler roller (8) on each side of the belt (for counter-bending radiussee previous page).
For greater or variable conveyor angles, several (at least three) idler
rollers (9) can be installed on each side of the belt. Their diameter
may be less than that of a single roller per side. A total change-ofdirection radius > 200 mm must be maintained, however, becausethe arc of contact at the individual rollers can otherwise lead tosplice failures.

Br>

200mm

➇➈3

RECOMMENDATIONSFOR CONVEYOR DESIGN
Special recommendations when using guide profiles
One of the K profiles shown in the table (or, alternatively,a rectangular profile) will be welded to the belt dependingon the dimensions of the conveyor.
Generally, a total tolerance of ± 2 mm transverse to theconveying direction must be assumed for the clearance
between the internal flanks of the guide profiles.

In these cases the lateral play z should be increased to5 + 0.3 % of the belt width [mm]. Where the centre-to-centre
spacing of the guide grooves is fixed due to the construction of the conveyor, the centre-to-centre spacing of theprofiles (i.e. the order size) can be increased.

Furthermore, as the belt extends in the longitudinal direction, a transverse contraction takes place. This corresponds
to approx. 30 % of the extension in the longitudinal direction and must absolutely be taken into account as well forbelts > 1.5 m wide.

Dimensions in mm

1.5 x 45°z

≥ (s+4)zh1.5 x 45°≥ 30
K profile on top face, belt guided by pulley

K profile on underside, belt guided by drive/reversing drum

1.5 x 45°

≥ (s+4)zzh

1.5 x 45°

≥ 30

K profile on top face, belt guided by guide roller

4

F profile on underside, belt guided by drive/reversing drum

– The flank angle α of pulleys and guide rollers (for profiles
on the top face) and drive and reversing drums (for profiles on the underside) must match that of the profile(see table). The outer edges facing the profile must be
chamfered 1.5 x 45° in order to clear the welt. The widthof a pulley groove must be ≥ s + 4 mm. The groove depth
should match the height of the profile.

K6K 10
K 13
K 15
K 17
K 30

b x h x s [mm]6x4x4
10 x 6 x 613 x 8 x 7.5
15 x 8 x 9.5
17 x 11 x 9.5
30 x 16 x 18

Flank angle α of idler roller [°]
75.5
70
7070
70
68sh

Squeezing the profiles leads to greater running resistanceduring operation and possibly to profiles being torn off thebelt. Therefore, the following details are crucial for thegeometry and positioning of idler rollers, drive and reversing
drums:

b– Pulleys and guide rollers must include a lateral fine adjustment option. When the conveyor is idling, the clearance
between the roller flank pointing towards the middle ofthe conveyor and the side of the profile must be set to1 – 2 mm. There should be no contact between roller
flank and profile, and hence squeezing, when the conveyor is idling.

Belt side details
With sidewall ➂Sidewalls can be used to close off the sides of a belt
completely.
Sufficient play is necessary to prevent contact with idler
rollers. It is important to realise that the top edges of thesidewall corrugations are squeezed together at a concave
bend and hence become wider transverse to the conveying direction.

➂Without sidewall ➃As an alternative to sidewalls, static guards with trailing sideskirts can be fitted either side of, but not in contact with,the belt. However, the side skirts can cause increased wearon the top face of the belt. At bends, each side skirt should
be fitted in several narrow strips as it is inadvisable to bend
the material in two directions. Profiles might have to be
moved inwards to provide space for the side skirts.

➃5Siegling – total belting solutions
Committed staff, quality oriented organization and­production processes ensure the constantly high standardsof our products and services. The Forbo Siegling Quality
Management System is ­certified in accordance with ISO 9001.

Forbo Siegling service – anytime, anywhere
The Forbo Siegling Group employs more than 2,300 people.
Our products are manufactured in nine production facilities
across the world. You can find companies and agencies withwarehouses and workshops in over 80 countries.
Forbo Siegling service points are located in more than
300 places worldwide.

Forbo Siegling GmbH
Lilienthalstrasse 6/8, D-30179 HannoverPhone +49 511 6704 0, Fax +49 511 6704 305
www.forbo-siegling.com, siegling@forbo.com

06/18 · Reproduction of text or parts thereof only with our approval. Subject to change.

Ref. no. 255-2

In addition to product quality, environ­­mental protection is
an important corporate goal. Early on we also intro­duced anenvironmental management system, certified in accordancewith ISO 14001.