How to adjust the brakes of an electric hoist?
Electric hoist brakes are achieved through the motor. Remove the tail cover and four fixing screws of the adjusting nut, and use a wrench to rotate the adjusting nut to the limit position in a clockwise direction. Then, rotate it counterclockwise one turn and install the fastening screws. The adjustment is successful.
For an electric hoist whose motor shaft is perpendicular to the drum shaft, it adopts a turbine drive device, which has a larger size in width, a heavy structure, low mechanical efficiency, and difficult processing. No manufacturer produces this type of product anymore.
For an electric hoist whose motor shaft is parallel to the drum shaft, it has the advantages of a small height and length size. Its disadvantages are a large width size, complex grouping, manufacturing, and assembly, and a large radius of track turning.
For an electric hoist whose motor is installed inside the drum, its advantages are small length size and a compact structure. Its main disadvantages are poor motor heat dissipation conditions, poor grouping, inconvenient inspection, installation and maintenance of the motor, and a complex power supply device.
For an electric hoist whose motor is installed outside the drum, its advantages are good grouping, high universal degree, easy change of lifting height, convenient installation and maintenance. Its disadvantage is a large length size.
What are the safety devices of an electric hoist?
Electric hoist is a widely used lifting machinery tool, and safety protection is important. Some parts inside the chain electric hoist play a role as a safety protection device. What are they and how do they work?
The design of the motor brake is characterized by its ability to immediately function even under full load when the power supply is turned off.
Hook and safety latch
The hook is forged from high-strength steel and undergoes heat treatment to meet strength and hardness requirements. It can rotate horizontally 360° and is equipped with a safety latch to ensure safety during hoisting and lowering.
Phase protection relay
The circuit design of the phase protection relay can protect and prevent the motor from burning out when the phase of the motor power supply is connected incorrectly.
Reverse-phase protection device
It is the protector of the power supply. When the power supply is connected incorrectly, the electric hoist will automatically control the circuit to protect the motor from burning out and avoid damage caused by improper operation.
The up and down limit switches can automatically cut off the power supply when the lifting or lowering exceeds the limit, preventing the chain from going beyond the limit and ensuring safety.
Emergency stop button switch (optional)
The button is used to stop the electric hoist in an emergency. It is a red, mushroom-shaped button located above the button switch. When the button is pressed, the power supply of the equipment will be cut off, and the button will automatically lock. Turning it clockwise can release the button and the electric hoist can be restarted.