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Blower system operation

29th March 2001, Page 46
29th March 2001
Page 46
Page 46, 29th March 2001 — Blower system operation
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Product is discharged from the multi-compartment body via the outlet pipe at the rate of about a tonne every two minutes. The process needs just under 1.0 bar (13psi) of air pressure, which is supplied by the Holmes blower mounted beneath the trailer.

Power for the blower comes from the PTO-driven VOAC hydraulic pump, rated at 601It/min at 1,000rpm and mounted on the tractive unit.

Simultaneously, a smaller oil pump on the blower's output shaft powers the tipping gear and hydraulics for the auger at the rear end of the body.

The auger is needed to agitate the product, especially meal, and direct it from the sides of the body into the rotary valve's throat.

The hydraulic oil supply is divided into two systems, a lowpressure one supplying the tipper gear, rotary valve and rear (auger) hydraulics at up to 122 bar (1,840 psi), and a highpressure (350 bar/5,150ps1), smaller capacity one feeding the PTO oil drive and blower motor.

Although the former, low-pressure reservoir holds sufficient oil (150 litres/33ga1) to be selfcooling, the smaller (16-ittre/3.5gal) system is integral with the Drum cooler pack.

Once this return oil reaches a predetermined temperature it passes through the pack's cooling radiator, where a fan helps to remove excessive heat before returning it to the Drum unit's reservoir.

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