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GRZK Enrober Belts are normally driven by toothed wheels. Correct mounting of the drive-  and deflection shafts in the frame results in a maintenance-friendly and exact belt run. In general, a genrober belt installation only has 1 drive shaft with toothed wheels. All other diverting and reversing shafts and/or diverting and reversing rollers are smooth and (possibly) provided with a groove at the location of the belt knots.

The dimensions of the drive wheels depend on the desired number of teeth, pitch of the tire and axle specifications. The wheels are custom made and have a width of 14 mm. Two drive wheels are located in all odd meshes just next to the nodes (see photo opposite). The number of drive wheels on a drive shaft of any belt becomes: (number of meshes/sections + 1)  pieces.

The free  space between wheel and node is approximately 3-5 mm. A different number of wheels with very short belts is possible.

GRZK Enrober Belt pulleys are made of stainless steel, Industrial plastics such as POM and various PA variants, and of other materials on request.

In addition to  the standard Esfo Wire Mesh Belt drive pulleys, the pulleys can be made so wide that they fill a whole mesh

(see photo below).


The drive can also be designed as a solid roller. The  gearing is then fitted in a solid shaft or tube. Please contact us for different sizes, designs and materials, so that we can make a suitable design for you.

The list below shows a preferred range of common drive wheels.Drive wheels with teeth number Z1 can be mounted on shafts up to 25 mm.Wheels with teeth number Z2 can be mounted on axles up to 40 mm.A minimum stock is maintained for a number of wheels.


Figure 1: A stationary or rotating shaft with grooves at the nodes

Figure 2: Stationary shaft or fixed pins with grooved plastic rollers

Figure 3: Solid Industrial plastic tip

The GRZK belts can be diverted in several ways. Since the belt has a top and a bottom, the belt can be bent positively, such as with the drive wheels and the take-over noses, and negatively bent (against bent), such as the encirclement with any positioning axes and rollers.

The detour/turn/takeover shafts and rollers with positive curved enrober belts can be performed in several ways and the detour is usually provided with a groove at the top of the belt connection because it protrudes under the belt. This connection recess is not required for negative belt diversions.

The divert/turn/take over shafts and rollers with positively curved enrober belts can be performed in several ways.

The list below gives the smallest permissible diverting diameters for each strip pitch, both in the positive (Dp) and in the negative bending direction (Dn). This does not alter the fact that if the design has the option of making the deflection diameters larger, this will benefit the life of the belt. Certainly in the case of the somewhat longer transport lengths and associated belt loads.


The top of a GRZK Enrober belt is flat.


The belt connections can be felt on the underside of a GRZK ernober belt. These connections protrude about 1.5 x the wire thickness under the product-carrying wires. eg curved conveyor

GRZK Enrober Belt (drive/layout)

GRZK Enrober belts can optionally be fitted with pressed into the wire drive or centering lugs (trapeze or pointed), or with depressions in the band creating a kind of gutter. Drivers in the form of separately attached axles are also possible. The belt can also be designed as a single transport chain for spread or finger conveyors.


Figure 1: A simple belt setup. The condition is that the products may run over the teeth of the drive wheels and that they are not damaged as a result. (teeth sticking out slightly through the tire)

Figure 2: Here is a case of 2 x crosover with positive bending direction and negative bending about a span axis. For the minimum diameters of the nose and negative deflection roll see page 3.2.


Figure 3:

See also figure 2.

Please note that a enrober belt may only be slightly tensioned. The only purpose of inflation is to allow the tire to run neatly in the drive wheels.

Figure 4: In this figure the belt hangs between the second negative diverting roller and the support roller in the return part. The own weight of this piece of tire ensures that the tire is pulled around the drive wheels with some tension.

Figure 5: In this figure, the belt tension is applied by the weight of a freely movable roller. For example, there is control over the position of the extension and the degree of belt tension. Mainly used for  large temperature differences.

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