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Grid pulleys / bar drums

Q: What is the function of the mesh discs in a bucket elevator?

Grid pulleys (bar drums) are predominantly used as foot discs in bucket elevators. They ensure reliable belt operation and reduce the risk of bulk material becoming trapped between the belt and the disc, which could damage both components. In particular, wear on the conveyor belt is significantly minimised.

Q: What materials are used for grid pulleys?

The grid pulleys are made from cast iron with lamellar graphite (EN-GJL-200 to EN-GJL-300).

Grid pulleys, also called bar drums, are mainly used as base pulley for bucket elevators and conveyor belts. We manufacture these components in different diameters (355 to 1,000 mm) and crown widths (140 to 500 mm). By combining several grid pulleys on one shaft, which are ball-shaped or spherically shaped, crown widths of over 2,000 mm can also be realised.

The bar-shaped running surface prevents bulk or transported material from getting between the pulley and the belt, where it is crushed and causes the belt to slip. Damage or wear to the drive belt is reduced. All types are manufactured by us as a version with only one stable plate. Deflector cones are therefore not necessary.

Downloads

Grid and belt pulleys(1215 KB)

Accessories

Pre-produced blanks are available up to up to a diameter of 630 mm are available from stock and can be delivered at short notice.

Several grating pulleys are designed as a unit on a shaft crowned or spherical shape. The multi-part design facilitates assembly.

The delivery is also available as a ready-assembled assembly including a precisely fitting shaft to minimise the assembly effort and reduces the costs.

At a glance

Features

Special production according to customers individual specifications or drawings
Standard for peripheral speeds up to 42 m/s
Maximum pulley diameter 2,500 mm
Maximum pulley weight approx. 6,000 kg

Flexible moulding process | Fast delivery

Individual model setups are not required – there are no model costs!
Change requests or adaptations can be accommodated without costs
Tread crowned according to DIN 111 or camber height according to requirements
Adaptation of the geometry to the respective drive situation
Common designs available from stock Flange widths: 140 | 160 | 180 | 200 224 | 250 | 280 300 | 315 | 355 | 400 | 450 | 500 mm
Short-term production and delivery possible
Delivery as ready-assembled assembly incl. precisely fitting shaft possible

Materials

Standard: Cast iron with lamellar graphite EN-GJL-200 to EN-GJL-300 (GG-20 to GG-30), DIN EN 1561

Shaft-hub connection

Finish bore with keyway and set screw
Prepared for Taper-Lock clamping bush connections

Possible designs

Arm or plate pulley
Reinforced versions for higher belt speeds

Balancing standards

Standard according to DIN 21940-11 in quality grade G16
Available in quality grades G6.3 or G2.5 on request

Surface treatment

Primed / black oxide finish as standard
Preservation of the functional surfaces with spray wax/oil
Individual surface treatment and special painting possible

Why Lütgert?

Flexible moulding process without individual models and without model cost

Special designs according to individual customer specifications or drawings

Pulley geometry optimally adapted to the respective drive situation

Individual design, control, recalculation and optimization of your drive

Customised processing (drilling, grooving, surface) acc. to customer specifications

Ideal for prototypes, as well as individual or series parts

Full transparency through creation of released drawings

Documentation of residual imbalances and surface treatments

Documentation to prove material properties, balancing grades and surface treatments

Extensive stock and short-term availability of urgent spare parts

Individual geometry selection due to a high number of variants

Outside- Ø [mm]	Number of bars	Rim width min [mm]	Rim width max [mm]
315	-	140	500
355	18	140	500
400	20	140	500
450	18	140	500
500	18	140	500
520	18	140	500
560	24	140	500
630	30	140	500
710	30	140	500
800	30	140	500
900	36	140	500
1.000	40	140	500

Frequently Asked Questions (FAQ)

What is the function of the grid pulleys in a bucket elevator?

Grid pulleys (bar drums) are predominantly used as foot pulley in bucket elevators. They ensure reliable belt operation and reduce the risk of bulk material becoming trapped between the belt and the disc, which could damage both components. In particular, wear on the conveyor belt is significantly minimised.

What dimensions and variants are available for grid pulleys?

These are typically manufactured in diameters ranging from 315 to 1,000 mm and rim widths from 140 to 500 mm. By combining several discs on a single shaft, it is also possible to achieve very large widths of over 2,000 mm – including convex or roof-convex designs.

What materials are used for grid pulleys?

Grid pulleys are made from cast iron with lamellar graphite (EN-GJL-200 to EN-GJL-300).

What types of shaft-hub connections are possible with grid pulleys?

Depending on the application, various mounting options are available, e.g. cylindrical bore with key(s) and set screw(s), clamping sleeves (e.g. TaperLock) or bespoke designs for flanges and couplings. This ensures flexible integration into existing systems.

Are customised designs and special geometries possible?

Yes, grid pulleys can also be manufactured to customer specifications or drawings. The geometry, bore pattern, flange width and surface treatment can be individually adapted to the specific conveying and drive conditions.

Phone: +49 52 41 / 74 07 0
info@luetgert-antriebe.de
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