The elevator speed limiter is a crucial component of the elevator's safety protection system. It acts as a safety control device that comes into play when the elevator car exceeds its normal operating speed or even faces the risk of freefall due to any reason, especially when all other safety devices fail to function. The speed limiter and the safety gear work together to stop the elevator car, serving as an essential safety feature. It continuously monitors and controls the car's speed, and when an overspeed condition occurs—exceeding the elevator's rated speed—the speed limiter promptly sends a signal, triggering a mechanical action that cuts off the power supply, causing the traction mechanism to brake.
If the elevator still fails to brake, the safety gear installed at the bottom of the car will forcibly bring the car to a stop. The speed limiter acts as the signal issuer, while the safety gear is the executor. The combined action of these two components ensures the safety of the elevator. The speed limiter and safety gear system is an indispensable safety device in elevators. In cases of overspeed, uncontrolled operation, or suspension device failure, the speed limiter and safety gear quickly bring the elevator car to a stop on the guide rails and maintain a stationary state, thereby preventing injuries and equipment damage.
The elevator speed limiter continuously monitors the running speed of the elevator car.
When the speed exceeds the elevator's rated speed, the speed limiter immediately issues a command.
This command triggers a mechanical reaction that cuts off the power supply, causing the traction machine to brake. If the elevator does not stop, the safety gear located at the bottom of the car will respond to the speed limiter's command and forcibly fix the car onto the guide rails.
To ensure the proper functioning of the elevator speed limiter, regular maintenance is essential.
Check the speed limiter's exterior for damage, and ensure components such as the rotating shaft pins and tension devices are operating normally.
Regularly apply lubricant to parts like the rotating shaft pins and tension devices to keep them operating smoothly.
Inspect the extension of the speed limiter's rope, and if it exceeds the specified range, shorten it promptly.
The speed limiter's operating speed should be calibrated and tested at regular intervals by the relevant authorities to ensure it functions within the speed limits specified by national standards.
