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Drum motors

Drum motors

1. NBR shaft seals on hardened cylinder barrels

Drum motors axles are usually manufactured from ST37. Commercially available seals rotate directly on the axles. The result, at some point in time, is grooves on the axle. In addition of course – oil leaks. This is not the case with the FTK Förderband Technik Kilian pulley motors: all drum motors are equipped with hardened and polished cylinder barrels made of stainless steel 316.


2. Oil loss is not a problem for us!

Oil change after 50,000 hours of work. Today, for reasons of cost, fewer and fewer users concern themselves with plant maintenance. The maintenance of complex plants is mainly carried out by outside specialists. Simple prefabricated parts, however, are usually used till worn out. This is also the case with drum motors. We have made allowance for this behaviour. The FTK Förderband Technik Kilian drum motors only require an oil change after 50,000 hours of work. In the case of operation with 3 shifts for example, (S1-operation, 365 days/year), not until after five and a half years.


3. Rotatable terminal box

It is not always possible to install the drum motor in such a way that the incoming electric cable can be fed directly into the fitting on the rear side of the terminal box. Either the cable is then arranged in a loop, which increases the danger of damage, or the terminal box is disassembled and reassembled in the correct position, which is very time-consuming. This is not the case with FTK Förderband Technik Kilian drum motors: after loosening an Allen screw® at the upper edge of the terminal box, it is possible to turn it to a maximum of 90° to the left or right. The correct position is thus ensured with the minimum of effort.

4. End caps made of cast iron resp. stainless steel

For various reasons, drum motors these days are equipped with prefabricated components made of aluminium. The main reason is supposedly the weight saving compared to steel or cast iron. The real reason however, is more to do with the possibility of cheaper machining when using aluminium and also the lower wear and tear of the tools. But is the strength of aluminium really comparable with that of the traditional materials? What if there is an impact from the outside or high belt tension? We use only cast iron, not only for the end caps but also for the gearbox casing and the terminal box.


5. Edged axle ends

Most drum motors have axle ends with a spanner flat for fixture to the conveyor belt frame. This is sufficient for the normal operating mode but when the applications are harder, e.g.  with a higher frequency of operation or in reverse operation, even a minimal clearance between the spanner flat and the fixture can cause damage to the fixture. A noise emission begins due to the impact at the change of load and almost always leads to the damaging of the motor. This is particularly the case when aluminium gearbox supports are used. Our edged axle ends offer double security as they are all wrought as 4-edged.  If you manufacture your motor seat accordingly (or you use our plummer blocks), there will be absolutely no risk of rotation. Play safe in normal operating mode too: square instead of spanner flat!


6. Basket shells with increased crowning

All drum motors are designed spherically to guarantee that the belt runs centrally. However, if thin casing is used, the crowning can only amount to 1.5 to 2 mm. That is the absolute minimum limit for motors of a large diameter. For reasons of stability, it is not possible to turn off more. We use a thicker casing for all our products. For this reason we can work with a greater crowning. For example, at D 215, the crowning is 4 mm.


7. Screwed terminal caps

Almost all drum motors, especially those in the diameter range of 80 – 320 mm, are today, for reasons of cost, equipped with press-fitted or bonded terminal caps. This ensures that the purchase of the Drum motor is cheaper but hampers the ease of maintenance of an industrial product. It is impossible to release the lid or, at best, only with the use of special tools. In practice, this means that there are lower procurement costs for the plant manufacturer but higher follow-up costs for the plant operator.

With our screwed terminal caps, this is not the case: with smaller diameters one terminal cap is screwed on and with larger diameters, both terminal caps are screwed on.


8. Ground and honed tooth profiles

The noise emission of a drum motor depends mainly on the machining quality of the toothed parts. Milling and peel milling are not sufficient. The grinding and honing of the tooth profiles gives the best quality. For us, both these procedures are standard. The enhanced running smoothness of our products means less friction and less vibration in connection with a long operational performance.


9. Stainless steel type plates

Have you also been annoyed by destroyed, missing or no longer legible type plates? Our type plates are, as a matter of principle, made of high-alloyed V4A! The type plates are always attached to the terminal caps or terminal box by means of rivets.  Data loss is not possible with our drum motors!


10. Cast iron gearbox support

For various reasons, drum motors these days are equipped with prefabricated components made of aluminium. The main reason is supposedly the weight saving compared to steel or cast iron. The real reason however, is more to do with the possibility of cheaper machining when using aluminium and also the lower wear and tear of the tools. We use only cast iron, not only for the end caps but also for the gearbox casing and the terminal box.