What is the safety factor for elevator wire ropes used for passenger transportation?
2 Answers
The safety factor for elevator wire ropes used for passenger transportation is 8-10. Below are specific introductions to automotive safety factor indicators: 1. Braking system: Also known as the brake system, it is divided into disc brakes and drum brakes. Disc brakes have the advantages of fast heat dissipation and light weight, especially exhibiting excellent high-temperature resistance during prolonged braking. Drum brakes, as the earliest type of brakes, have now become a technology on the verge of being phased out in the market. 2. Number of airbags: When a car collision reaches a certain severity, the in-vehicle sensor module deploys soft airbags at a speed of 1/100th of a second, protecting the head and chest, reducing head injury rates by 25% and facial injury rates by approximately 80%. Entry-level to mid-range cars are typically equipped with 1-2 airbags, mid-range B-segment cars often have 4 airbags, while more than 6 airbags are found in high-end cars renowned for their safety. The more airbags, the higher the protection level. 3. ABS+EBD configuration: ABS (Anti-lock Braking System) prevents wheel lock-up during braking, significantly reducing the likelihood of vehicle loss of control. EBD (Electronic Brakeforce Distribution), as an auxiliary function of ABS, adds a control software to the ABS control unit and is generally used in combination with ABS to enhance its effectiveness.
Regarding the safety factor of passenger elevator wire ropes, there are clear stipulations in national standards. The safety factor for elevator wire ropes is generally no less than 12, which may seem like a large number but is absolutely necessary. A safety factor of 12 means that the wire rope can actually withstand a maximum tension that is more than 12 times the heaviest load. Why is it set so high? After researching, I found that this accounts for many unexpected situations, such as the impact force when an elevator suddenly stops or is overloaded. Additionally, newly installed elevators must undergo static load testing, where the car is loaded to 150% of its capacity and suspended mid-air to check if the wire ropes show any issues. Regular maintenance also includes periodic inspections of wire rope wear and broken wires. For example, my neighbor, who is a property maintenance worker, mentioned that if more than 15% of the wires in a single strand are broken, the rope must be replaced. These measures are all in place to ensure our safety when using elevators.
