The safety and stability of elevators are ensured through a combination of advanced technology, strict regulations, and proper maintenance. Modern elevators are equipped with multiple safety systems, such as brakes, safety gears, door interlocks, and speed governors, which prevent accidents like free fall or uncontrolled movement.
In addition, governments enforce strict standards and inspection procedures to ensure that elevators are installed and operated safely. Regular maintenance and periodic inspections help detect and fix potential issues before they become serious problems.
Finally, proper usage by passengers-such as not overloading the elevator and following safety guidelines-also plays an important role. Together, these factors ensure that elevators operate safely, smoothly, and reliably in daily use.
Safety Protection System
Function
To ensure the safe operation of the elevator and prevent any accidents that could endanger human safety. Components: Primarily consists of a speed governor, safety gear, buffer, door lock, limit switch, and other devices.
Speed governor
A safety device designed to activate the safety gear when the elevator's operating speed exceeds a specific threshold above its rated speed.
Safety Gear
A mechanical safety device that, upon activation by the speed governor, brings the car or counterweight to a halt-maintaining a stationary state-by clamping firmly onto the guide rails.
Buffer
A cushioning safety device located in the elevator pit (at the bottom of the hoistway), designed to absorb the kinetic energy of the car or counterweight.
Door Locking Device
An electromechanical interlock safety device that locks the car door and landing door once they are closed; the elevator is permitted to operate only after the associated safety contacts have engaged.
Limit Switch
A non-automatic resetting safety device designed to forcibly cut off both the main power supply and the control power supply if the car overruns the terminal landing stopping device, acting before the car or counterweight assembly makes contact with the buffer.
Operating Principle Of The Safety Clamp
Buffering Distance And Buffer Stroke
Buffering Distance
The distance between the buffer base and the buffer when the car or counterweight is normally parked at the lowest landing.
Buffer Stroke
The distance traveled as the buffer becomes fully compressed when the car or counterweight bottoms out.
Electrical Control and Signal Systems
Control Cabinet
An electrical enclosure primarily comprising a main control board, frequency inverter, electromagnetic contactors, and various relays, capable of executing functions such as elevator motor speed control, start/stop operations, and other control functions.
Power Failure Cabinet (alp Cabinet)
Power Failure Cabinet
The ALP cabinet is an emergency device developed and designed by elevator manufacturers. In the event of a sudden power outage or phase loss from the external power grid during normal elevator operation, this cabinet responds within 3 seconds by automatically switching the control circuit to initiate emergency operation.
Rotary Encoder
Its function is to provide feedback on the motor speed and elevator car position signals to the control microprocessor. The precision of this feedback directly impacts the system's speed control accuracy and leveling accuracy, thereby influencing key performance indicators such as ride comfort and floor leveling performance.
Car Top Electrical Box
Primarily responsible for collecting car commands and controlling the operation of the door operator.
Traveling Cable
One end is fixedly mounted to the middle section of the hoistway wall, while the other end is attached to the bottom of the car frame.
Primary Functions
To supply power to the car lighting fixtures and door operating mechanisms; to transmit signals from the door operating mechanisms and safety switches; and to transmit signals from the car operating panel, as well as signals for the call response indicators and car position indicators.
Branch Cable
