If there is a boxing accident in the container loa […]
If there is a boxing accident in the container loading and unloading operation, the loss is often serious. How to avoid the boxing is a problem that the practitioner must pay attention to at all times. The hidden danger of the boxing accident mainly exists container spreader in the wire rope and the hoisting tool twisting mechanism.
The lifting tools used in various container handling machinery are similar. The four corners of the lifting tool are equipped with a set of twist locks. The hooks of each twist lock are convex downwards. When the hanging box is used, the four twist lock hooks are aligned with the container. The shape lock hole is further lowered by the lifting tool, and the operation of the oil cylinder is performed after the hole is in place, so that the hook rotates 90° the hook buckles the lock hole, and the container and the lifting tool are integrated into one body, which is in a locked state and can be lifted. The unloading operation needs to lower the lifting tool until the hook is not pulled, and then operate the hook to rotate 90° in the unlocked state, after lifting, the lifting tool is separated from the container.
Of course, the standards for container spreaders have high requirements on the safety performance of the twist locks. The hoisting tools produced by various manufacturers have the protection of electric interlock and mechanical interlock double insurance.
The mechanical interlock realizes that the cocking tool can be opened when the hoisting tool is placed, and the hoisting tool cannot be unlocked after being lifted. When the box is placed, the box pin is pressed, the spring is compressed upward, and the upper limit ring of the box pin is lifted up, leaving the working plane where the lock cam is located, and the lock can be rotated. After the lifting tool is raised, the box pin protrudes downward under the action of the spring, the limit ring falls to the side of the lock cam, the cam is blocked, and the lock cannot be rotated.