Upper belt rollers

Upper belt rollers

The term " Upper belt rollers " refers to the idlers that are installed in the upper run of the conveyor belt system and carry the conveyor belt as well as the bulk material that lies on the conveyor belt. 
Because they are installed in the upper run, they are often called " upper run rollers ". Because of their affiliation with a conveyor belt system, all idlers in such a system are often referred to by a collective term " conveyor belt idlers ".

For detailed information on idler dimensions, please refer to "Dimensions and designs".

Quality classes of upper belt pulleys in comparison

We have defined three quality classes ("Compact", "Compact Plus" and "Premium"), which we recommend as the optimal solution depending on your application-specific case. Each quality class corresponds to the type of operating conditions on site and the requirements placed on the idlers, respectively, also the manufacturing effort.

If noise reduction measures are required, we can offer you all idlers in "silent" design.

For more detailed information, please refer to the subchapters on the respective quality classes (see below).

Quality class
Support roller shell
Pipes	Welded, dimensionally rolled steel pipes according to EN 10305-3	Welded, dimensionally rolled steel pipes according to EN 10305-3; with narrowed tolerances (Küpper standard)	Welded, dimensionally rolled steel pipes according to EN 10305-3; with narrowed tolerances (Küpper standard)
Materials	S235JR according to EN 10025-2	S235JR according to EN 10025-2	S235JR according to EN 10025-2
Bearing housing (roller bottoms)
Type	deep-drawn part	forged part, cast part	forged part
Materials	DD13 according to EN 10111	C15 according to EN 10267-2 or S235JR according to EN 10025-2 or EN-GJL-200 according to EN 1561	C15 according to EN 10267-2 or S235JR according to EN 10025-2
Bearing seat	IT7	IT7	IT7
Axes
type	full axis	Full axle or rigid hollow axle	Full axle or rigid hollow axle
Materials	round steel according to EN 10277	round steel according to EN 10083-2 / tube according to EN 10305-3	Round steel according to EN 10083-2 / Pipe according to EN 10305-3
Bearing seat	IT9	IT6	IT6
Bearing
Factory	AKT	AKT	AKT
Bearing type	groove ball bearing	groove ball bearing	groove ball bearing	Spherical roller bearings
Bearing sizes	6204 - 6306	6306 - 6312	6306 - 6312	21312 - 22312
Sealing	2Z	2Z	2Z	-
storage air	C4	C4	C4H	C3
Tolerance classes	P0	P0	P5	P0
Cage	Plastic cage	Plastic cage	plastic cage	steel plate cage brass cage
Lubrication	50 - 60% of free bearing volume	50 - 60% of free bearing volume	Application specific design
Sealing
type	QLR hybrid gasket	QLR Hybrid Gasket	QLR hybrid gasket  Dust cover  Rain cover
Running characteristics
Rotary [mm/m]	0.7*	0.5*	≤ 0.2
Balance grade	≤ G40 according to ISO 1940**	≤ G25 according to ISO 1940**	≤ G14 according to ISO 1940***
*	Mean value of total delivery
**	Tape speed 3 m/s
***	Tape speed up to 10 m/s