Among the auxiliary devices of the stacker, what can actually clamp the barrels and cans to make the loading and unloading safe?

The bucket clamp is specifically designed to securely grip barrels and cans, which is crucial for ensuring safe loading and unloading during material handling operations. Its structure typically features padded or contoured surfaces that conform to the shape of the containers, thereby providing a firm and stable hold. This minimizes the risk of slippage or dropping, which could lead to injuries or damage to the items being transported.

In contrast, the other devices mentioned are not suitable for this task. The sling clamp is designed for handling larger loads that may need to be suspended, but it lacks the necessary grip to securely hold smaller cylindrical objects like barrels and cans. Fork extensions are used to extend the reach of the forklift's forks, but they do not provide a clamping function. Lastly, a chain hoist is primarily employed for lifting heavy loads vertically rather than for clamping and securing items laterally during transport.