High safety and reliability of the machine is equipped with a load-limiting protection device, can avoid overloading caused by the adverse consequences; lifting hook with a locking device, can prevent the lock from accidentally slipping off; the motor is equipped with a thermal protection device, when the motor due to frequent use of the motor caused by the temperature rise is too high, the device will automatically cut off the motor in order to protect the motor from being burned out; the machine is equipped with an upper and lower limit device, when the hook rises or falls to the limit, the machine will automatically cut off the power supply and then stop the action; the machine is equipped with an emergency stop button so that the operator can immediately turn off the power in critical situations. This machine is equipped with upper and lower limit devices, when the hook rises or falls to the limit position, the machine will automatically cut off the power supply and the hook will stop moving; this machine is equipped with an emergency stop button, so that the operator can immediately turn off the power supply in a critical situation.

The machine adopts high-strength aluminum alloy body with beautiful appearance, compact body, small volume and light weight. It adopts two-level gear transmission, and the high-speed level is helical gear transmission, thus the transmission is smooth and the noise is small.

The main parts of the machine are made of high-grade alloy steel and processed by many special heat treatment processes, which have the characteristics of high strength and good abrasion resistance; the upper and lower hooks are made of high-strength alloy steel with high toughness after strengthened heat treatment, so that even if the machine body is damaged due to overloading, the hooks will only produce solenoidal deformation without brittle fracture.

The machine is equipped with chain storage bag, the chain can be automatically stored in the chain storage bag during operation, in order to prevent the chain from being stuck and stained with dirt when it is falling