Our range of flights can be subdivided into five categories:
Extruded rubber flights. Order reference includes height above bare rod. When LF is added to order reference, flight top incorporates a soft lip to improve crop fall protection. These extruded profiles are cut to length either straight or with wing shaped ends. Top length is determined by the clearance between the return rollers. Base length may be the distance between the traction belting, if friction or cam drive is used. Toothed sprockets require sprocket run recess clearances to be cut into the base length. Sideway drifting of the flight is prevented by cutting away a central recess, into which a cable clamp is placed & secured around the flight’s trailing support rod. High stress loads may require the incorporation of hardened rods under the flight. If the flights are heavily loaded, run at steep elevation angle and small 9-10 mm diameter rods are used, then the support rods may require a rod covering to reduce the degree of flight-on-rod tilting.
MRF type flights
60 or 80 mm high rubber flights (as measured from the top of a bare rod) vulcanized to an 8 mm or 10 mm rod. Incorporates fixed end wing to base length sections, centre is adjustable in 25 mm stages.
Removable flight/Snap-on flight
An extruded 145 mm high flight profile (5 ¾ inches above bare rod) slides into & is retained by the upper section of injection moulded plastic segments. The underside of the plastic segments fits rod pitches between 32 to 42 mm and snaps onto the rods after the belts is made. Rubber flight profiles renewal is simplified, flights can also be easily repositioned & can be supplied loose with the belt.
These flights are made in injection moulds from very durable plastic in fixed length and resists high bending & impact forces. Flight type RM 645 (9 Fingers and length of 645 mm) can be cut to length. Type PM 460 is recommended for the sugar beet bunker discharge conveyor (7 fingers and length of 460 mm). It offers in relation to the width and number of traction belting the following overall belt widths:
|belting||belt width||quantity of flights|
|2 x 60 mm||580 mm||1|
|2 x 75 mm||610 mm||1|
|3 x 60 mm||1100 mm||2|
|3 x 75 mm||1145 mm||2|
Greater belt width variations can be obtained with the element type plastic flights. These are mounted next to each other over two rods. The types 65 and 155 are often used in sugar beet ring type elevators. Type 155 incorporates 2 fingers at 85 mm spacing. Type 65 has one finger and 65 mm finger to finger spacing. The spacing of the fingers can be increased by spacer elements. The weight reduction offered by plastic flights reduce centrifugal force influences associated with steel flights.
We manufacture flights to your needs & illustrate here only a small number of popular types. Hardening of pivot & support rods is highly recommended. Types BR 75 and BR 77 are sugar beet harvester designs with the load stress spread over two hardened rivet rods. The vertical finger or loops are welded to an oversized tube, relative to rod diameter and can be of almost any length, diameter or shape. Whilst our drawings only illustrate one means of capturing support from the trailing rivet rod, other support design options are also possible.
Two versions of the BR-type flight are available:
- The BR 75 type’s position is retained by means of a hollow clamping pin being passed through the base tube, between central rod ends. This flight is fitted at the time of manufacture unless you specify that the pivot rod is to be secured by nuts and bolts, or bolts with flow drilled plates.
- The BR 77 type consists of two half sections bolted together in the centre.
A rod covering can be fitted to the pivot rod to reduce the tolerances between tube & rod, thus reducing wear & movement.