Unloader


Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Idioms.

unloader

[¦ən′lōd·ər]
(mechanical engineering)
A power device for removing bulk materials from railway freight cars or highway trucks; in the case of railway cars, the car structure may aid the unloader; a transitional device between interplant transportation means and intraplant handling equipment.

Unloader

 

(unloading machine), a machine used to unload bulk goods into spoil banks, bins, or conveyors. Unloaders include dumpers, scoopers, and vibrators, as well as pneumatic and plow unloaders.

Car dumpers and dump trucks are two types of dumpers. Plow unloaders push loads from railroad flatcars to the bunkers beneath them by means of plows, which move back and forth.

Scoopers are used to unload open cars and consist of a combination of either scoop elevators or flight conveyors and a stacker belt conveyor, which are mounted on a self-propelled chassis or gantry; the open car being unloaded is set beneath the chassis or gantry.

The basic element of vibrators is a vibration table, which communicates oscillations to the load. The load pours through the hatches of a car under the impulse of vibration. Loosening clamps are secured on vibration tables to free frozen loads.

unloader

A control mechanism for an electric-motor-driven compressor; controls the pressure head of the compressor; permits the motor to be started at low starting torque by removing the load during this initial period of operation.
References in periodicals archive ?
The primary user of the unloader is Anaconda Nickel Ltd, which imports sulphur for its nickel-cobalt project at Murrin Murrin in Western Australia's Eastern Goldfields, but the system will also be available for other bulk import customers.
Many bulk bags are packaged with an inner liner for purity and safety, so a bulk bag unloader with bag liner tensioning control is needed.
A removable bag-lifting frame with bag strap hooks and fork tubes allows loading of the lifting frame with bag intact, onto a cradle at the top of the unloader frame posts.
The company's bulk bag unloaders have dust-free product discharge from bulk bags.
FREMANTLE PORT Authority's (FPA) new $11 million continuous ship unloader for its Bulk Cargo Jetty at Kwinana is expected to be ready for use in late April.
The machine features a GE-Fanuc 18i-series CNC control, belt driven spindle, 30-hp AC spindle drive, eight-station turret with live tooling options, and complete automatic magazine-type material loader, and finisher part unloader.
Depending on specific production needs, the machine can be equipped with a robotic casting unloader for wheels from 5-50 kg and allows full quality control before the castings are transported.
When a bearing in the Swedish-made speed reducer on the auger drive of a barge unloader caused the reducer to fail, the maintenance supervisor for Texasgulf Chemicals Co.
NORDIC BUSINESS REPORT-15 September 2008-Metso Corporation to supply railcar unloader systems in Australia(C)1994-2008 M2 COMMUNICATIONS LTD http://www.
The unloader is also equipped with FlowFlexer bag activators that raise and lower opposite bottom edges of the bag at timed intervals, loosening compacted materials and promoting material flow into the bag discharge spout.
An option on the unloader side is to drop parts into a shoot or conveyor belt.