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The image below shows an eyelink, plate link and cross rods.
The following materials are used for Twentebelt eyelink conveyor belts:
Other materials are available on demand and/or on advice.
Twentebelt offers a variety of eyelink belts. Click on a belt type to learn more.
Twentebelt offers 4 different side finishes for its eyelink conveyor belts.
1 – Pitch: Centre-to-centre distance of cross rods (ranging from 15,9 to 76,2 mm)
2 – Cross pitch: Centre-to-centre distance of eyelinks (ranging from 2,8 to 50 mm)
3 – Wire diameter (ranging from 1,6 to 3,2 mm)
4 – Number of location wires (ranging from 0 to 8)
Explanation of specification method for eyelink belts. For example: DL-LK 6 – 50 – 2,5 – 5 location wires 1
DL-LK: Welded eyelinks with welded edges
6: Cross-pitch (mm)
50: Pitch (mm)
2,5: Wire diameter (mm)
5: Cross bar wire diameter (mm)
Pitch (mm) | Wire diameter | Cross rod diameter | Minimal centre-to-centre distance between 2 eyelinks | Minimal centre-to-centre distance between 2 eyelinks in welded version |
---|---|---|---|---|
15,9 | 1,8 | 3,2 | 3,6 | Not applicable |
25,4 | 1,6 | 5 | 3,2 | 3,25 |
2 | 4 | 3* | ||
30 | 1,6 | 4 | 3,2 | 3,25 |
2 | 4 | 4,05 | ||
38,1 | 2 | 8 | 4 | 4,05 |
2,5 | 5 | 5,05 | ||
3 | 6 | 6,05 | ||
50 | 1,6 | 5 | 3,2 | 3,25 |
2 | 5 | 4 | 3* | |
2,5 | 5-7 | 5 | 5,05 | |
3,2 | 6 | 6,4 | 6,45 | |
50,8 | 2 | 5-8 | 4 | 3* |
2,5 | 5-8 | 5 | 5,05 | |
3 | 8 | 6 | 6,05 | |
75 | 2,5 | 5-8 | 5 | 5,05 |
3 | 8-10 | 6 | 6,05 | |
76,2 | 3 | 10-13 | Not applicable | 6,05 |
Generally two configurations are possible to provide eyelink belts with support: longitudinal support or herringbone support.
Support return path
The return path only carries the weight of the belt. This is why a lighter support structure is sufficient here. In the longitudinal construction one of two profiles can be left out. The herringbone support can be executed in a less compact form. In the return path, the first 500 mm of the belt slacken. There is no support in order to make the formation of a sag possible. The formation of a sag will prevent the belt from climbing on to the drive. It is also necessary in order to prevent the belt from being pushed instead of pulled through the return path. At both ends the support sections should be slightly bent down, in order to establish a gradually guidance of the belt on to and off the profiles.
Rollers can also serve as a support to restrict the frictional coeffecient. The rollers must be at right angles to the frame, parallel to each other and level. The distance between the rollers is irregular, in order to prevent an irregular run.
Frictional coefficient
Below you will find an indication of the frictional coefficient for the different alternatives:
Side guidance is achieved by vertical profiles at both sides of the installation. These profiles should not get in contact with the belt. They are meant to guide the belt in case it deviates from the carrying path. A clearance of 5 to 10 mm between the profiles and the belt is basically sufficient. The geometry of the frame and the load of the belt are points of attention in the design and the adjustment of the installation, because these factors can influence the run of the belt.
The minimal facility at the input side consists of profiles both on top and on the underside, at the discharge side, however, only on top. The maximal facility consists of profiles over the full length of the carrying path and the return path with the exception of the sagging part. The compromise is the placement of profiles of 300 to 500 mm length every 2000 mm. The appropriate configuration is also determined by the speed, the length, the width and the load of the belt. In case of doubt, please do not hesitate to contact us. We will be pleased to think along with you.
If provided with one tooth per pitch the rollers are one-directional and thus only to be used for drive or for return. Rollers with double strips can be used for both drive and return, if the installation is designed for this purpose.
Of course, this depends on the length and the load. In general, the return shaft is the one for tensioning and adjustment. In case of short belts and insufficient geometry of the frame this can lead to a bad drive (see drawing below).
In most cases a screw tensioning device will suffice. An example of a screw tensioning device can be seen below.
In the case of a continuous tensioning device, hydraulic, pneumatic or with springs, there is always the risk of a certain amount of uncontrolled stretching that tends to elongate the belt. The table below provides the tensioning length per pitch. It has to be taken into account when the shaft has to be adjusted. The tensioning force = (the weight of the belt in the return part x the friction coefficient) x 9,8.
Pitch | Tensioning length |
---|---|
15,9 | 45 |
25,4 | 75 |
30 | 90 |
38,1 | 110 |
50/50,8 | 150 |
75/76,2 | 250 |
Please click on a subject below to learn more.
Below you will find downloads related to eyelink conveyor belts.
Twentebelt Eyelink conveyor belts – Technical brochure – English
Twentebelt Eyelink conveyor belts – Request quotation form – Dutch
Twentebelt Eyelink conveyor belts – Request quotation form – English
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