Will the Wire Rope Break or the Winch Motor Stall First?

[DJT1967]

We have a winch that lifts a load weighing 25kg up a shaft 30m deep. A 2mm Dia wire rope goes up the shaft over a guide pulley and down to the winch reeling drum. There is a load cell on the guide pulley.

The question is this. "If the load cell fails and the load being lifted gets snagged on the steel work as it is lifted will the wire rope break before the motor gearbox on the winch stalls / trips out?"

Wire Rope 2mm Diameter with a Breaking Load of 230kg

Winch Drum 300mm Diameter.

I'm still trying to get the information on the Motor / Gearbox but if someone could point us in the right direction as to what formula we could use to calculate this and also what specific information we would require for the Motor / Gearbox. Thanks in advance for the any help provided.

 

[stewartcs]

We have a winch that lifts a load weighing 25kg up a shaft 30m deep. A 2mm Dia wire rope goes up the shaft over a guide pulley and down to the winch reeling drum. There is a load cell on the guide pulley.

The question is this. "If the load cell fails and the load being lifted gets snagged on the steel work as it is lifted will the wire rope break before the motor gearbox on the winch stalls / trips out?"

Wire Rope 2mm Diameter with a Breaking Load of 230kg

Winch Drum 300mm Diameter.

I'm still trying to get the information on the Motor / Gearbox but if someone could point us in the right direction as to what formula we could use to calculate this and also what specific information we would require for the Motor / Gearbox. Thanks in advance for the any help provided.

A sketch of the system would be nice for clarity.

Assuming my visualization of what you are describing is correct, you'll also need the locked-rotor torque for the motor (I presume it is electric). That torque divided by the drum radius will approximate the tension in the cable. Specifically, you'll need the distance from the axis of rotation of the drum to the point where the cable leaves the drum. The closest wrap will give the maximum value since the radius will be the smallest there.

Thus, as long as that value is less than the breaking strength of the cable, you should be fine. Of course this assumes you are not concerned with the load on the guide pulley.

Hope that helps.

CS

 

[oswaler]

Based on the information provided, it is not possible to accurately determine whether the wire rope or the motor gearbox would fail first in the event of a load cell failure. This would depend on several factors, including the strength and condition of the wire rope, the power and capacity of the motor gearbox, and the amount of resistance or friction in the system.

To calculate the potential failure points, we would need to know the exact specifications of the motor and gearbox, including their power output, torque, and maximum load capacity. We would also need to consider the weight and condition of the load being lifted, as well as any potential resistance or friction in the system.

In general, it is important to regularly inspect and maintain all components of the winch, including the wire rope, motor, and gearbox, to ensure safe and efficient operation. If there are any concerns about the strength or condition of the wire rope, it may be necessary to replace it with a stronger or more durable option to prevent potential failures.

Overall, it is important to prioritize safety and regularly assess all potential failure points in the winch system to prevent accidents and ensure successful lifting operations.