Elevator is an important means of transportation in modern buildings, which is related to the safety of people’s life and property How to improve the efficiency of elevator operation, reduce energy consumption of elevator, reduce mechanical wear and prolong the service life of elevator are all very important research topics. Elevator is a complete set of equipment used for fixed elevations in floors. It has characteristics of safe, reliable, comfortable, accurate, easy to operate and transportation efficiency. It consists of lifting traction system, guiding system, safety device and electric control system.
At present the elevator control widely adopted two ways, one is using microcomputer as signal control unit, to complete the elevator signal acquisition, running status and the function set, realize automatic scheduling and collection operation function of the lift, drag the control are done by frequency converter; The second control method USES PLC (Programmable Logic Controller) instead of microcomputer to realize signal set selection control. In terms of control mode and performance, the two methods are not much different. Most domestic manufacturers choose the second method because of the small scale of production and the high cost of designing and manufacturing microcomputer control devices. PLC has high reliability and flexible program design. This design USES Mitsubishi, FX2 series PLC to control the displacement sensor of static magnetic grid to control the elevator flat layer.
Static magnetic grid displacement sensor in the elevator control system for the adjustment of the elevator flat layer controlled, electric control system of the elevator is “central nervous”, its quality is good or bad directly affects the quality of the elevator. Passenger and medical ladders are comfortable to ride, and comfort are related to running time. If you want to ride comfortably, you need to extend the acceleration and deceleration times, so as to extend the running time and reduce the running efficiency of the elevator. Therefore, in order to make the elevator have a high operating efficiency, there should be an appropriate limit for the speed of addition and subtraction, and the change should be stable, which puts forward the following requirements for the electronic control system.
Safe and reliable, easy to troubleshoot, in the premise of meeting the requirements of use, more better if the wire more simple.
The noise and vibration are small, the selection of components should be reasonable, the electromagnetic sound should not be large, the structural parts of the installation parts should be rigid enough and have anti-loosening measures.
It is able to adapt to frequent starting, stopping, adjusting and reversing work requirements, also it with good speed control performance and easy to change working mode. Acceleration, deceleration, and constant speed to be smooth, the velocity curve is also smooth and does not move slightly in front of the station.
Automatic flat layer can be realized, and the flat layer must be accurate.
It can adapt to a large range of variable lifting load and can start heavy load.