Railroad Car Unloaders
The Foremost Railroad Car Unloader is a complete, self-contained material conveying system operating on a vacuum/pressure continuous loading principle which offers the advantages of continuous material flow at high rates over substantial distances. Continuous material flow not only insures maximum efficiency from the blower unit, but also eliminates any potential clogging which might occur (particularly at the bottom of long vertical lines) by intermittently starting and stopping the material flow as in a batching vacuum system.
Download the Railroad Car Unloader Brochure.
The Unloader utilizes a single positive displacement blower (as standard, or an optional dual blower arrangement if required) to create the vacuum as well as generate the positive pressure conveying air flow. The blower is protected from material entrance on the discharge side by a check valve. Further protection is afforded by using both vacuum and pressure relief valves. Critical functions are monitored by gauges. The single material receiver/ air filter features automatic, continuous filter element cleaning. Material build-up on the elements is monitored by a gauge. The rotary valve under the receiver is chain driven by a fractional horsepower gearmotor. In some applications the Filter receiver can be replaced with a cyclone transfer station.
Railcar Unloader Operation
Vacuum is drawn on the material receiver by the motor driven positive displacement blower. Material and air flow from the railroad car to the receiver through the rail car adaptor and flexible hose. In the receiver the material and conveying air are separated. The material falls to the bottom of the receiver and the air passes through a filter (or filters) to the blower. The material in the bottom of the receiver is metered out and fed into the pressure side of the system by a rotary valve. The conveying air on the pressure side is generated by the blower. Material and air flow, under pressure, from the Railroad Car Unloader to the storage silo or bins.
|Model||H.P.||Power Unit Dimensions||Receiver Dimensions||Shipping Weight|
|A (Length)||B (Width)||C (Height)||D||E|
|Typical Conveying Rates|
|Model||100 ft||200 ft||300 ft||400 ft||500 ft||600 ft||700 ft||800 ft||1000 ft|
*Based on Suction Distance of 80 ft. Horizontal and 10 ft. veritical and 3 elbows and on pressure side vertical lift of 40 ft. and 3 elbows.
REQUIRED SERVICES FOR ALL MODELS
Power: 220/440 Volts, 3 Phase, 60 Hz
Compressed Air: 4.5 SCFM at 90-100 psi.
Figure Above: Combination Vacuum/Pressure (Pull/Push) Delivery from Railcar - Material is drawn from the railcar by the vacuum side of a pump assembly and transported by vacuum to a transfer station where it is dropped out of the conveying air stream and re-entrained in a pressurized air stream and conveyed by pressure to silos. The transfer station can be configured as a self cleaning in line filtered receiver or cyclone receiver with off-line air filtration.
The most frequently used of these is the combination (pull-push) system that draws the material out of the rail car by vacuum, passes it through a transfer station and blows it into the silo by pressure. The pull-push system is used most frequently because, for most applications, it is not possible or practical to attach a pressure system to a rail car and a vacuum system is not efficient for the distances, elevations and material transfer rates required to move material from rail car to storage silo. On the basis of the equivalent distances involved from rail car to silo and the required transfer rate, a pull-push system may include one positive displacement blower package using both the vacuum and pressure sides of the pump or two blower packages, one for the vacuum side of the system and one for the pressure side.
Filter Receiver Transfer Station
Vacuum Power Unit
Cyclone Transfer Station