Backstop FX series

Integrated Freewheels FXR … are sprag freewheels without bearing support and with sprag lift-off X. They consist of the Integrated Freewheels FXM with additional torque limiter. For reversing operation, they can be optionally equipped with a reverse running function. This allows the conveyor belt to run backwards, for example during maintenance work.

The sprag lift-off X ensures a wear-free freewheeling operation when the inner ring rotates at high speed.

In continuous conveyor installations with multiple drives it is important to consider the problem of the unequal distribution of backdriving torque to the individual drives and backstops. As soon as the installation comes to a standstill, the entire backdriving torque is applied primarily to a single backstop, due to differences in the play and elasticity of the drives involved. In installations equipped with backstops without torque limiters, the individual gearboxes and the corresponding backstops must be designed to accommodate the entire backdriving torque of the conveyor installation in order to ensure safety.

The problem of the unequal distribution of backdriving torque is solved by using backstops FXR … with torque limiting. The torque limiter which is built into the backstop slips temporarily when the specified torque is exceeded until the other backstops engage in succession. In this way, the entire backdriving torque of the conveyor installation is distributed to the individual gearboxes and backstops. Furthermore, dynamic peak torques which occur during the locking process are reduced, thereby protecting the gearboxes against damaging peak torques. For this reason the use of backstops FXR … with torque limiting in continuous conveyor installations with multiple drives enables the application of gearboxes with smaller dimensions.


Application as

• Backstop

for continuous conveyor installations with multiple drives in which each drive is equipped with a backstop.


Advantages

• Protection of gearboxes from overload by unequal load distribution in multiple drives
• Protection of gearboxes from dynamic peak torques during the locking process
• Smaller gearboxes can be used without negatively effecting the safety
• Protection of the backstops, as dynamic peak torques are reduced by temporarily slipping