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DRIVE

Any form of drive can be used. The tube can have plugs inserted in the tube or taperlock drives mounted on the tube's outside diameter.

Agricultural machines use the 6 spline 1 3/4" drive to be strong enough for the high power requirement of the standard impellor and to cope with the use (abuse) most machines encounter.

Walterscheid 2500 series PTO shafts are supplied as standard. They are available with various shearbolt torques or with an auto reset version that can be reset by slowing the PTO drive. This is recommended for contractors working in unfamiliar stores.

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FRAME WORK

The basic part is usually a length of box section as it provides a safe and convenient way of mounting the bearing plates. The framework required for standard and special machines is attached to this. The standard agricultural frame is galvanised and uses cat 2 attachments.

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TUBE

Tubes can be matched to any requirement. Diameters and wall thickness can be adjusted to obtain the stiffness, flexibility and length demanded by the situation.

Agricultural models use 75mm and 88.9mm cold drawn tubes as standard with lengths up to 8m/27ft. These cope well with the thin and thick ( 2 metre.) crusts encountered, and have enough flexibility to absorb the shock loads from weedy hard lumps, stray tyres, dead animals etc.

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BEARINGS

The bearings are ball or roller bearings mounted on tapered sleeves. This ensures easy dismantling and a fret free fit between the tube and bearing without the use of damaging grub screws.

Typically the drive end has a self aligning cartridge ball bearing in a machined steel housing capable of resisting the high axial loads from the impellor's thrust. The main bearing can be a spherical ball or roller bearing mounted in a steel housing.

The bearings are not designed to be permanently submerged.

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AUGER

If crusts or solids are present the auger allows the tube to drop freely through them to reach the liquid below essential for the impellor to generate the thrust required for mixing the crust. Equally, when the crust starts to circulate, it can pass the tube unimpeded by the stationary framework found with conventional stirrers thus reducing mixing times and energy consumption. Whilst stirring the tube can be manoeuvred sideways through thick stationary crusts allowing them to be sliced off for quicker stirring.

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IMPELLOR

The impellor's square section boss slides onto the tube's square drive and is held in place by a pin and R clip. This boss can have any number of blades or devices attached as the axial length is not restricted by bearings or framework. Cavitation, caused by too much power for the impellor size, is avoided with the Mix' it System by increasing the number of stages or the diameter of the impellor. Circumferential tips can be added to focus thrust and to increase the amount of crust mixed on each pass by reducing "bouncing off". With the ability to remove the impellor in one minute without tools, impellors can be exchanged for the changing conditions - reverse thrust, weed, aireation, etc. Stock designs are galvanised and deliver between 60 -180hp at 5-700 rpm. Tower stirrers use a high turbulence impellor as the high thrust impellor may lift the machine unless restrained.

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PRODUCT COMPARISON

MIX' IT stirrers were developed because the traditional machines were found to be:

Slow, inefficient, difficult to maintain and not very effective in any thing but runny slurry

Their submerged bearings are a constant source of failure and friction.

Generally their drive shafts are incapable of delivering much power without failing and the impellors are restricted to a size that cavitate in the liquid when much power is applied. (making them erode and even less efficient).

The stationary frame work makes it difficult to penetrate thick crusts and when crusts try to circulate they are impeded by the frame work.

There are no such limitations with the MIX  IT system.

• The conventional drive shaft running in a supporting tube is made redundant by rotating the tube. The strong tube rotates in two grease lubricated bearings on a tractor mounted frame, clear of the slurry, so no longer requires an end bearing running in the liquid.
• With no submerged bearings straw, string, wire, or any aggressive material can be mixed without bearing failure.
• Cavitation is not a problem as the tube's ability to transmit large amounts of power can be utilised by the large diameter impellor with sets of axially spaced blades.
• An auger can be fixed to the rotating tube so the stirrer will drop through any crust to reach the liquid. This combination slices the approaching crust so offers no resistance unlike conventional stirrers with stationary frames.
• The design and construction is simple. All parts are designed to be easily serviced. With no frictional loses from submerged bearing all the energy is available to the impellor.
• Any trade can adapt or create their own designs of impellor to slide onto the square drive.
• The innovative features of these machines have been tried and tested by farmers and contractors since 1988 and the design has been proven to be reliable

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SPECIFICATIONS European pat no. 283316

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