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How Clutches Contribute To Harvest Success

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How Clutches Contribute To Harvest Success
How Clutches Contribute To Harvest Success

Video: How Clutches Contribute To Harvest Success

Отличия серверных жестких дисков от десктопных
Video: Clutch, How does it work ? 2023, January
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A cutting unit cuts grain or rapeseed with the cutter bar and conveys it to the combine harvester. It acts as its "tool", so to speak. The important thing is to capture the crop and feed it forward with the ear of grain via the feeder to the threshing unit without the material jamming along the way.

The Premiumflow high-performance band cutting units from Zürn do this particularly well thanks to active funding on the extended cutting table. With them, the user can increase the threshing performance of his combine by up to 15% and thus make better use of the machine's performance potential without the machine consuming more energy.

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Adapt the cutting unit to different types of fruit

Another advantage is that the cutting unit can be adapted to different types of fruit in just a few simple steps. This is an important argument for the user, because the harvest window is getting shorter and the change between crops due to ripening of new varieties is becoming more common.

In the Premiumflow series, depending on the cutting width, there are up to eight side-by-side, individually foldable band segments in one cutting unit. The segmented design has the advantage that individual belts are easily accessible and can be removed, cleaned or replaced if necessary.

A shaft coupling - many tasks

For the connection of the band segments, Zürn had to find a solution that allowed each individual segment to be installed and removed with little effort - a task that the driver usually does himself. In addition, the connection should dampen vibrations and generally contribute to increasing the service life of the drive train. An important factor is the insensitivity to corrosion, moisture and high mechanical loads. Agricultural engineering is therefore considered to be a particularly demanding industry with a high requirement profile for the components in the machines.

In the present case, a Rotex coupling from KTR was chosen as the connecting element. The shaft coupling is already in use in a wide variety of designs in many agricultural machines: This includes attachments such as field sprayers, fertilizer spreaders and seeders, but also self-propelled machines such as corn choppers, potato harvesters and grape harvesters.

The torsionally flexible, maintenance-free claw coupling consists of two interlocking hubs, between which there is an elastomer gear ring. This type of coupling reduces vibrations in the drive train, absorbs shocks and compensates for shaft misalignments. It also reduces the restoring forces that act on adjacent components such as bearings and seals - this increases the life of the band cutting unit and thus also the operating time.

Made to measure for the cutting unit

KTR has developed a tailor-made coupling solution for the Premiumflow series. This is offered by the “Core Business” business area, which adapts existing coupling series to the respective application.

The basis for the development work was a Rotex size 28 with split hubs, cylindrical bore and keyway. This standard design enables the radial assembly and disassembly of the coupling without having to move or remove adjacent components. As desired, this creates the opportunity to expand individual belt segments. Compared to the catalog version, KTR shortened the coupling hubs to the minimum length in order to keep the distance between the webbing segments as small as possible. This achieves a maximum belt area, which optimizes the crop flow, and also creates the conditions for a good seal between the individual belt segments.

Supplementary information on the header for large combine harvesters from John Deere

The Premiumflow series ribbon cutters were specially developed for John Deere combines, initially in six cutting widths from 5.50 m (18 ft) to 10.70 m (35 ft). The range was later supplemented by the 640PF model with a working width of 12.20 m (40 ft) for the large combine harvesters of this brand.

Permanent connection through clamping and hollow dowel pins

An application-specific solution was also found for the connection of the shaft and coupling hubs. The customer specification was a robust coupling that can be quickly installed and removed in the field. The clamping of the coupling hubs ensures a reliable, non-positive connection. In addition, hollow spring pins ensure that the hubs are correctly positioned on the drilled shafts and that the specified installation dimensions are observed. This is important because the coupling balances the length tolerances of the numerous successive shafts on the cutting unit that is up to 12.20 meters wide. The dowel pins also center the hub halves and align them symmetrically. This ensures even power transmission and even loading of the ring gear.

Overall, the combination of non-positive and positive shaft-hub connection ensures the transmission of high torques in a small installation space. This type of connection also has the advantage that the assembly and disassembly of the coupling can be carried out using standard tools such as a hammer, cotter pin driver and Allen key. This is an important argument in agricultural engineering, where machine operators usually do cleaning work and minor repairs themselves. (sh)

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* Stefan Ahlert is an application engineer at KTR Systems GmbH in Rheine

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