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NO DEGRADATION OR BRIDGING
Page 84
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w Charrold pneumatic-discharge system features a vibrator panel I hopper feed to the rotary seal HARROLD LTD., St. Peter's Road, Huntingdon, recently demonstrated their new )ermatic bulk tipping vehicle, the pneumatic harge equipment of which has a number of el features and is suitable for handling most mlar materials from grain and feeding stuffs Lggregates and coal. The model demonstrated based on a Bedford KGL chassis equipped an HCB-Angus sandwich power take-off was shown discharging grain.
his vehicle will be exhibited in the demonLion park at Earls Court, while a second )ermatic will be displayed on the company's d (141) mounted on an Albion RE 27AL ;sis and destined for operation as a coaliery vehicle. A shaft-driven Godfrey Roots ver is fitted to the Bedford bulker and a Holmes ver to the Albion, the latter being a larger 7er-running unit than the Roots.
careful study was made of various estalsK1 methods of feeding the rotary seal before as decided that an improved system was tired if self-cleaning were to be combined L characteristics that obviated degradation bridging, a common problem in the case of -free-flowing materials. Auger feed to the was rejected because of its degradation ten:des and mechanical complication, and a ating-platform feed (to a side-located seal) not favoured on account of its complexity cost.
the Tippermatic system a rear-mounted per is fed by a ramp on each side that extends the collection area to the full width of the body, and is equipped with an hydraulically actuated forward-opening flow-control door. The material is therefore fed to the rear of the seal across its entire width which provides balanced loading and virtually eliminates the possibility of crushing the material between the blades of the seal and the casing on the outlet side.
Bridging is prevented by a high-frequency vibrator plate at the back of the hopper, displacement of the plate being only about 0.060 in. The plate is rubber-hinged and vibrated by an eccentric mechanism operated by a small hydraulic motor. It is a very simple piece of equipment compared with a low-frequency vibrating platform.
Of 15 in. diameter, the seal rotor is driven by a Unitdrive hydraulic-motor-and-gearbox integral unit, produced by Adan Hydraulics Ltd., which incorporates an orbital motor of outstanding compactness. Unit construction obviates misalignment and the use of external shafts.
The seal tips are faced with Stellite and are ground to a close tolerance, which provides a long life and minimizes blow-back through the valve.
Controls are grouped on a console on the discharge side of the body, on which the control lever of the Edbro front-end tipping gear is also located.
The capacity of the system is indicated by the fact that it will handle grain or coal at the rate of 45 tons an hour. Materials such as light aggregate can be discharged up to a height of 80 ft.