Motorised 24VDC Drop Test Clamp
Crane slung drop test clamp.
Drop test clamp (motorised)
Method of operation
- The clamp is hung from a crane hook by the Ø80mm hook ring.
- The clamp is connected to a control box with a 24VDC supply via a 5-core cable (earth, positive, switched feed, drop signal and negative return see sketch)
- The object to be dropped is connected to the clamp by a ring, typically a chain master link.
The clamp works by an electric motor turning a camshaft. The main drop cam has a hollow segment so that when it aligns with the release arm the jaws of the clamp can open. A high torque brush less stepper motor is used to drive the clamp, the control inverter is used to lock the motor in position The motor drives the cam via a toothed belt and overrun dog clutch. The dog clutch protects the motor and drive from the release torque by allowing the camshaft to accelerate ahead of the drive. A limit switch controls the motor so that the drive rotates the camshaft through 180º in successive steps.
Loading the clamp
- The clamp should be in the open position from the previous drop.
- If it is not. Then press the push button on the clamp for 5 seconds, the clamp will open.
- Place the ring into the mouth of the clamp.
- Press the push button on the clamp and hold for 5 seconds.
- The clamp will close and move to the lifting position.
- Isolate the power.
Releasing the load
- Lift the load to the required height.
- Energise the system.
- Press the release button on the control for 5 seconds.
- The clamp will move to the release position and the load will be dropped.