Carry rollers

Carry Rollers

The term Carry Rollers or Carrying Rollers refers to the idler rollers that are installed in the upper run of the belt conveyor and carry the conveyor belt and the bulk material lying on the belt. 
Because they are part of a belt conveyor, all idler rollers are often referred to collectively as " belt conveyor rollers ". The carry roller is therefore a type of conveyor belt rollers.

Detailed information on the dimensions of the rollers can be found in the chapter "Dimensions and designs".

Quality classes of carry rollers in comparison

We have defined three quality classes ("Compact", "Compact Plus" and "Premium"), which we recommend as the optimum solution depending on the specific application. Each quality class corresponds to the type of operating conditions on site and the requirements on the idler rollers.

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

More detailed information can be found in the sub-chapters on the respective quality classes (see below).

Quality class
Roller tube
Tubes	Welded cold-sized steel tubes acc. to EN 10305-3	Welded cold-sized steel tubes acc. to EN 10305-3; with restricted tolerances (Küpper Standard)	Welded cold-sized steel tubes acc. to EN 10305-3; with restricted tolerances (Küpper Standard)
Materials	S235JR acc. to EN 10025-2	S235JR acc. to EN 10025-2	S235JR acc. to EN 10025-2
Bearing housing
Type	Deep-drawn part	Forged part, cast part	Forged part
Materials	DD13 acc. to EN 10111	C15 acc. to EN 10267-2 or S235JR acc. to EN 10025-2 or EN-GJL-200 acc. to EN 1561	C15 acc. to EN 10267-2 or S235JR acc. to EN 10025-2
Bearing seat	IT7	IT7	IT7
Shaft
Type	Solid	Solid or bending-resistant hollow shaft	Solid or bending-resistant hollow shaft
Materials	Round bar steel acc. to EN 10277	Round bar steel acc. to EN 10083-2 / Tube acc. to EN 10305-3	Round bar steel acc. to EN 10083-2 / Tube acc. to EN 10305-3
Bearing seat	IT9	IT6	IT6
Bearing
Manufacturer	AKT	AKT	AKT
Type of bearing	Deep-groove ball bearings	Deep-groove ball bearings	Deep-groove ball bearings	Spherical roller bearings
Bearing sizes	6204 - 6306	6306 - 6312	6306 - 6312	21310 - 22312
Sealing	2Z	2Z	2Z	-
Radial bearing clearance	C4	C4	C4H	C3
Tolerance class	P0	P0	P5	P0
Cage	Plastic cage	Plastic cage	Plastic cage	Sheet steel cage or  brass cage
Lubrication	50 - 60% of  bearing´s free internal volume	50 - 60% of  bearing´s free internal volume	Customized solutions
Sealing
Seal type	QLR hybrid seal	QLR hybrid seal	QLR hybrid seal  Dust cover  Roller protector
Running characteristics
Total Indicated Runout (TIR) [mm/m]	0,7*	0,5*	≤ 0,2
Balancing quality	≤ G40 acc. to ISO 1940**	≤ G25 acc. to ISO 1940**	≤ G14 acc. to ISO 1940***
*	Average value of the total delivery
**	Belt speed 3 m/s
***	Belt speed up to 10 m/s