The grab overhead crane principle
Grab overhead crane is a kind of lifting machinery specially used for loading and unloading bulk materials such as logs, minerals, coal, sand and gravel materials, and is often used in ports, power plants, terminals, chemical industries, etc. The biggest difference with the general overhead crane is that the grab device, can grab bulk materials. The working principle of the grab overhead crane is:
In the case of a rope grab, in the double reel winch, a set of wire ropes is used to support the spreader, and another set of wire ropes is used to drive the grab bar. First, after the grab is opened, it descends onto the bulk material and pulls the wire rope, and the wire rope pulls the beam to close the flap, so that the grab is filled with loose material. The hoisting mechanism raises the spreader, the running mechanism runs to the designated position, the wire rope is kept still, and then the wire rope driving the grab is loosened, the grab open, and the loose material falls down.