Low Speed Backstops

Low Speed Backstops

are located on the pulley or head shafts of gearboxes and prevent reverse motion of conveyor belts or bucket elevators.

➧ Backstop
for installations with low speeds.  The freewheels are designed for the use in inclined conveyor-belts, elevators or pumps. Taconite
seals protect the freewheels from contamination with dust or dirt.

Key Features

Low Speed Backstops FRHD with lever arm are sealed sprag freewheels with ball bearings. They are supplied oil-lled and ready for installation.
The Low Speed Backstops FRHD are arranged on through shafts or shaft ends.
Nominal torques up to 900000 lb-ft.
Bores up to 21 inch.

Application example

Backstop FRHD 900 on the head drum shaft of an inclined conveyor belt system. The lever arm is bolted to the freewheel. The backdriving torque is supported by the lever arm on the base plate. When the conveyor belt is without,any load, the drum shaft can be turned in both directions during maintenance by removing
the bolts

Mounting

The backdriving torque is supported by the lever arm.The lever arm must not be clamped into position. It must have 0,5 inch play in the axial and in the radial direction. The tolerance oft the shaft must be ISO h6 or j6.

Example for ordering

Freewheel size FRHD 800 with a 3,500 inch bore: • FRHD 800, d = 3,5 inch