What are the power and safety devices of the material elevator?

The power unit of the material elevator consists of the following parts:

First, the design and manufacture of hoists shall comply with the provisions of building hoists (gb/t195). The ratio of drum diameter to wire rope diameter shall not be less than 30. The distance between the flanges at both ends of the drum and the outermost wire rope shall not be less than 2 times the diameter of the wire rope. The steel wire rope on the drum shall not be less than 3 turns.

Second, for the traction machine, the ratio of the diameter of the traction wheel to the diameter of the steel wire rope should not be less than 40. The wrap angle should not be less than 150 degrees.

Third, the ratio of pulley diameter to wire rope diameter should not be less than 30. The pulley shall be equipped with a device to prevent the steel wire rope from falling off. The pulley and the cage are connected by steel.

Fourth, the selection of steel wire rope shall comply with the provisions of steel wire rope for lifting purposes (gb/t8918). The diameter of the steel wire rope of the self lifting cage shall not be less than 8 mm, and the safety factor shall not be less than 12. The diameter of steel wire rope for lifting cage shall not be less than 12mm, and the safety factor shall not be less than 8.

Fifth, when the load reaches 90% of the rated lifting capacity, the lifting capacity limiter should send a warning signal. When the load exceeds 110%, the lifting limiter shall cut off the main power supply for lifting.

Sixth, limit switch. When the cage rises to the upper limit position, trigger the upper limit switch, cut off the power supply of the cage and stop running. The over travel distance of the upper part should not be less than 3 meters. When the cage drops to the limit position, the limit switch is triggered and the cage stops running.

Material upgrading has been banned in many places because there are many potential safety hazards. Therefore, in the process of use, daily inspection and maintenance should be done well. Finally, thank you for your attention, and thank you for your roast and comments!