Based on the classification of elevator drive, can be divided into six categories of AC elevator, DC elevator, hydraulic elevator, rack and pinion elevator, screw elevator,
1, AC elevator
The elevator with AC induction motor as the driving force. According to the dragging method, it can be divided into AC single-speed, AC double-speed, AC voltage regulating speed control, AC variable voltage frequency control, etc. The elevator can be driven by AC induction motor.
2, DC elevator
The elevator with DC motor as driving force, the rated speed of this kind of elevator is generally more than 2.00m/s. The elevator can be divided into two types: AC single speed, AC double speed, AC voltage regulating speed, AC variable voltage frequency regulating speed and so on.
3, hydraulic elevator
generally refers to the use of electric pumps to drive the flow of liquid, by the plunger to make the car lift.
4, rack and pinion elevator
The guide rail is processed into rack and pinion, the car is equipped with gears that mesh with the rack, and the motor drives the gears to rotate the car to lift the elevator.
5, screw elevator
Straight top elevator plunger processed into a rectangular thread, and then with a large thrust bearing nut installed in the top of the cylinder, and then through the motor through the speed reducer (or belt) to drive the rotation of the nut, so as to make the screw lifting the car up or down elevator.
6, linear motor
Linear motor-driven elevator, the power source is linear motor. In addition, the elevator was introduced at the beginning of the steam engine, internal combustion engine as the power to drive the elevator directly, is now basically extinct.
Expanded Information:
The invention of the elevator and its origin
In 1852. Otis's patron - the owner of the Bedstead Manufacturing Company in Yonkers, New York - asked him to build a freight elevator to ship the company's products. As a skilled foreman, Otis didn't see this as a difficult task, and Otis designed a brake.
A truck spring and a brake lever were installed at the top of the platform of the elevator and connected to the guide rails on both sides of the elevator shaft, and a lifting rope was connected to the truck spring so that the weight of the lifting platform alone was enough to pull the spring and avoid contact with the brake lever.
If the rope breaks, the truck spring will weaken the pulling force, the two ends of the standing should bite with the brake lever, you can be firmly fixed in place to prevent the platform from continuing to fall, so the safety of the elevator was introduced.
Baidu Encyclopedia - Elevator
Baidu Encyclopedia - Elisha Graves Otis