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Parallel pusher

Application

Parallel Pushers are used throughout baggage handling, screening and sortation systems to sort individual baggage items from a conveyor line or carousel to adjacent line or sort chute. The Model 593 parallel pusher has been designed to provide a smooth and gentle transfer of varying baggage types. It has also been developed to minimize the impact to the bag by the use of a cycloid motion, so that the pusher blade is not only moving across the belt but also along its direction of travel. A deflector guard is fitted to the tail end of the blade reducing the risk of a bag jam during the return of the blade.

The unit also has the flexibility of being able to transfer bags from different conveyor types at varying junction types; these include:

From To
Transport Conveyor Parallel Conveyor
Perpendicular Conveyor
Horizontal Carousel Gravity Spurs
Spill Chutes or Glacis


Features

  • Flange Mounted Gear Box
  • Impact Resistance Rubber on Blade
  • Cycloid Blade Motion
  • Inverter Controlled (High Speed Applications)
  • High Sort Rate
  • Hydraulic Shock Cylinder
  • Deflector Guard Fitted to Blade
  • Simple Linkage Mechanism for Blade
  • Motion 360° Motor Rotation for One Complete Cycle
  • Sealed For Life Bearings
  • Design Flexibility
  • State of the Art PLC Controls

Application Benefits

  • Drive reliability and ease of maintenance
  • Reduces shock impact to baggage
  • Blade follows closely motion of bag for smooth sort action
  • Ensures smooth cycle action of pusher blade during high cyclic periods
  • Up to 2000 sorts per hour
  • Cushions blade motion when returning to the rest position
  • Prevents mis-tracked baggage being driven into pusher mechanism
  • Reduces shock loads in pusher structure by use of T.D.C. mechanics
  • Eliminates risk of pusher blade over-run
  • Reduces maintenance requirements
  • Accommodates variations such as bed width, belt height, drive components etc.
  • Use of standard PLC technology enables clients handling / screening schemes to be complemented

Design Options

Conveyor Width

Carousel Width

Guarding

Material Finish

Standard Variations

1000 mm

914 mm or 1082 mm

Security fencing or localised guards

Painted mild steel or galvanised steel

General Construction

Pusher Blade
The pusher blade itself is approximately 1250 mm long by 350 mm high. It is a precision fabrication made from aircraft grade aluminium and incorporates the deflector guard as one piece. It is covered with impact resistance high-density rubber foam that is encapsulated within a hard wearing polyester woven fabric to protect the rubber surface from impact and pitting damage.

Link Mechanism
The diverter blade is connected to the drive mechanism via a pair of interconnected link arms. The link arms are fabricated from nominal 30 mm tubing. Each link bar is connected to the blade via a machined pivot shaft which sits in between two off 2-hole flange mounted bearings which are bolted to the top and bottom flanges of the blade. The other end of the link bar is mounted to the pusher frame also via a machined pivot shaft which sits in between two off 4-hole flange mounted bearings. An adjustable tie-rod is fixed between the link bars which ensures the two link bars move in unison ensuring the blade remains parallel during the push stroke.

Drive
The integral geared motor is flange mounted to the underside of the pusher frame. The motor is a 0.75 kW T.E.F.C., 1440 rpm, with integral brake; the gearbox is selected to suit the particular application. A machined drive flange is fixed to the output shaft of the gearbox, which in turn is connected to the link mechanism via an adjustable tie rod. In this way the rotary action of the drive gearbox is transferred into the linear motion of the pusher arm. The drive flange completes 360° of travel for one full pusher cycle.

End of Travel Sensor / Shock Cylinder
A hydraulic shock-absorbing cylinder is mounted to the frame to assist with the ramp down of the pusher at the end of its stroke. The motion of the link bars is such that the velocity of the pusher blade is at its minimum at the start and end of the stroke. A separate proximity type electrical sensor will detect when the blade has reached the end of its cycle. This will cause the power to be cut to the drive motor and the brake to be applied to stop the pusher.

Support Frame
The pusher is mounted on a support frame adjacent to the sortation conveyor or carousel bed structure. This is manufactured from fabricated and formed mild steel. A mild steel sheet guard covers the complete frame for personnel safety. At the point where the pusher deflector guard section of the blade penetrates the rear of the support frame, the guard is locally extended.

Typical Isometric View of Parallel Pusher
Local Guarding Removed

Parallel pusher

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