AOpen DE7200 Series Instrucciones de operaciones descargar pdf (Pagina 11)

INTRODUCTION

20 Sep 12 1-3

DE-7200VFDCentrifuge

Rotating Assembly

The rotating assembly consists of a cylindrically shaped, bowl, conveyor assembly, gearbox, and

related components. The bowl consists of a straight cylinder with a conical section at the solid

discharge end and a flat liquid bowl head at the opposite end. Openings are provided at both

ends to permit liquid and solid discharges. The bowl ends are supported by roller bearings having

grease fittings to facilitate periodic lubrication.

Bowl Assembly

The liquid bowl head at the liquid discharge end contains movable weir plates that permit manual

adjustment of the liquid level remaining in the bowl during rotation. Notched locking plates

adjacent to the weir plates facilitate precise adjustment. Although they are individually adjustable,

all plates must be set at the same level. The liquid level or pond depth, along with other factors,

helps determine the liquid content of the discharged solids. The conical bowl at the solid

discharge end forms an upward sloping beach, where solids are dried and continuously

discharged through the solid discharge ports. Replaceable inserts line the solid discharge ports to

minimize the rate of wear due to abrasive action.

Conveyor

The conveyor assembly is a hollow, cylindrical auger that receives the inlet slurry into its interior,

disperses it through feed nozzles to the bowl assembly, and transports the solids to the solids

discharge outlets. An electric motor connected to the input shaft of a three-stage planetary

gearbox turns the conveyor in the same direction as the bowl but at a higher rate of speed. The

outer housing of the gearbox is secured to the bowl, while the output shaft is directly connected to

the conveyor.

The differential speed setting on the control panel determines the conveyor speed in relation to

the bowl speed. This relationship remains consistent; as bowl speed is varied, the conveyor

speed varies commensurately but maintains the differential relationship. For example, a bowl

speed of 2000 RPM and a conveyor differential speed of 10 results in the conveyor rotating at a

rate of 2010 RPM.

The feed tube at the liquid discharge end directs inlet slurry into the interior of the conveyor, which

rapidly disperses the material through feed nozzles into the bowl. Replaceable inserts line each of

the six feed nozzles to minimize wear due to abrasive action. A roller bearing supports the

conveyor at the liquid bowl head, while at the solid end the conveyor is supported by the bearings

that are integral to the conveyor drive gearbox.

Conveyor Drive Gearbox

The conveyor drive gearbox is a three-stage planetary gearbox that rotates the conveyor at a

faster speed than the bowl assembly. The gearbox is mounted on, and consequently driven by,

the bowl assembly, Input and output shafts of the gearbox are supported by internal bearings. The

conveyor drive motor is coupled to the gearbox input shaft by a flexible coupling, which permits

compliance with slight alignment variations. The gearbox contains a gear system that transfers

rotation from the motor and bowl to the conveyor’s output shaft.

The input shaft end of the gearbox is supported by the solid end main bearing, while the output

end is secured to the bowl. The gearbox ratio of 49:1 turns the conveyor at a proportionally faster

rate than the bowl assembly. The control system ensures that the conveyor’s rotational speed

varies directly with bowl speed, maintaining a consistent differential relationship for solids

conveyance.

During an overload condition, excessive solids in the conveyor may overburden the motor or

gearbox, causing motor torque to increase and resulting in an overload alarm. If the conveyor’s

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AOpen DE7200 Series Instrucciones de operaciones Pagina 11

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