Safety devices
They protect both the drive shaft and the machine against the overload peaks to which they may be subjected during their work. The safety devices must be mounted on the machine side, as determined by international regulations. Correct maintenance of the devices which require lubrication is necessary.
| Type | Description | Application examples |
|---|---|---|
| Pin torque limiter | It acts against excess torque, interrupting the transmission of power when the preset value is exceeded and automatically re-engaging once the cause of the overload is removed. |
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| Shearbolt clutch | It interrupts the transmission of power when the transmitted torque exceeds the settled torque value. This interruption occurs due to the shear nut breaking, which must be replaced in order to restore the initial conditions. |
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| Disc Friction Clutch |
It limits the excess of torque, with regards to the preset tare value, by means of the relative sliding between its components, maintaining the transmission of power. The sliding speed depends on the type of overload (complete block or slowdown). Once the cause of the overload has been removed, the original drive shaft conditions are restored. It also absorbs torque peaks during the start-up process on machines with inertia problems. The setting of the clucth can be adjusted by modifying the working height of the springs. The prolonged sliding of the friction discs causes excessive heating and wear. In this case you need to carry out maintenance and discs must be replaced. |
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| Free wheel |
It transmits the power in the preset work direction and is used to eliminate torque peaks generated by the machine's inertia (rotors, steering wheels) only in the deceleration or sudden or unexpected stop phase. |
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| Friction clutch with free wheel |
They combine the disc clutch and free wheel functions. |
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| CAM Type Cut-out Clutch |
It interrupts the power transmission when a breakdown torque occurs exceeding the pre-established torque value During the action of the limiter, the transmission of power is interrupted, automatically re-engaging by reducing the speed of rotation, if the cause of the overload has been removed or the torque causing the issue has been reduced. |
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