Free hook falling hoisting mechanism and crane

Abstract

The invention relates to a free-hook-falling hoisting mechanism and a crane. The free-hook-falling hoisting mechanism comprises a connecting shaft; the winding drum is arranged on the connecting shaft in a sleeving manner, and the winding drum and the connecting shaft synchronously rotate; the brake is located in the axial direction of the connecting shaft, the brake and the connecting shaft are coaxially arranged, and the brake comprises a stator which is fixedly installed; the rotor and the connecting shaft are in coaxial transmission; the coil is arranged on the stator, and the coil is electrically connected with a power supply system on the crane. According to the free-hook-falling hoisting mechanism and the crane, non-contact type large-load braking can be achieved during free hook falling of the winch.

Description

technical field [0001] The invention belongs to the technical field of free-fall hooks, and in particular, relates to a free-fall hook hoisting mechanism and a crane. Background technique [0002] At present, the hoisting mechanism on the crane is driven by the motor in the lifting state and the hook-dropping state. In the actual operation of the crane, the hook needs to be dropped from the height. The hook lowering process is slow, time-consuming, and inefficient, and this process is always driven by a motor, which wastes fuel, falls and lifts frequently, and the hoist is frequently forward and reversed, and the motor is easily damaged. Later, a free-fall hook hoist appeared. . [0003] The free-fall hook type hoist is to let the suspended heavy objects do free-fall motion, so that the hoist can only rely on the gravity of the heavy object to drive it to rotate freely without any driving force. ) braking during the free lowering process, this braking method is particularl...

AI Technical Summary

Problems solved by technology

[0002] At present, the hoisting mechanism on the crane is driven by a motor in both the lifting state and the hook falling state. In the actual work of the crane, the hook needs to be dropped from a high altitude. The lowering process of the hook is slow, time-consuming and inefficient, and this process is always driven by a motor, which wastes fuel, falls and lifts frequently, and the hoist frequently rotates forward and reverse, and the motor is easily damaged. Later, a free-falling hook type hoist appeared.

[0003] The free-falling hook hoist allows the hoisted object to do a free fall movement, so that the hoist can rotate freely without any driving force and only relies on the weight of the weight to drive it. ) in the process of free lowering, this braking method is particularly difficult. At this time, the heavy load on the hoist moves downward with a high-speed free fall, and the required braking force will far exceed the gravity of the hoisting heavy object. The prior art The free-falling hook hoisting mechanism can only be operated with no load or a small load to ensure the safety of the free-falling hook braking. However, this kind of hoist with a small load will limit the hoisting load of the crane. On the other hand, this kind of hoist uses It is a contact brake. The contact brake brakes by generating friction resistance. After a long time, the friction parts will wear out, which will make the generated braking force inaccurate.

Images