How does the overload protection of the hand chain hoist work?

How does the overload protection of the hand Chain Hoist work?
The design of the hand chain hoist overload protection device is to ensure that when the load exceeds the rated load capacity of the hand chain hoist during the lifting operation, a warning can be issued in time and the lifting can be stopped, thereby protecting the safety of the operator and the equipment. The following is the specific mechanism of the overload protection of the hand chain hoist:

1. Early warning and limit mechanism
The overload protection device usually includes two functions: early warning and limit. When the load approaches the rated load capacity of the hand chain hoist, the early warning mechanism will issue a warning signal, such as a sound or light prompt, to remind the operator to pay attention to the load. If the load exceeds the set safety threshold, the limit mechanism will be activated to prevent the hand chain hoist from continuing to work.

2. Elastic deformation and adjustment mechanism
A hand chain hoist overload limit device pre-sets the safety load by setting the maximum elastic deformation of the first spring. When the load exceeds this set value, the movable rod will move out of the through slot, and then the movable rod will move down to jam the gear in the hand chain hoist, making it unable to operate normally

3. Eccentric bracket and push switch
Some overload protection devices use the downward movement of the eccentric bracket to squeeze the overload push switch to achieve the early warning function. However, this design may cause the overload push switch to be triggered by other falling objects when the eccentric bracket does not fall to the overload position, resulting in low early warning accuracy

4. Jammed gear mechanism
In order to improve accuracy, some hand chain hoist overload limit devices use an adjustment mechanism to drive the movable rod to jam the gear in the hand chain hoist. This mechanism uses the distance of the movable column moving down to determine the maximum load capacity, achieve overload limitation, high sensitivity, and low error rate

5. Structural protection
The structure of the hand chain hoist overload protection device may include a fixed box, a fixed hook, a movable column, a limit plate, a first spring, a movable rod, and an adjustment mechanism. These components work together to ensure that the chain hoist stops operating in the event of an overload, preventing accidents

6. Improved safety performance
The introduction of overload protection devices has significantly improved the safety performance of chain hoists. They can not only warn of overload conditions, but also stop the operation of the chain hoist when necessary to avoid failures and accidents caused by overload

In summary, the overload protection of the chain hoist monitors and limits the load through a series of mechanical and electronic devices to ensure safe operation. The design and application of these devices reflect the continuous progress and innovation in the safety performance of modern lifting equipment.