In elevator accidents, upward speeding is a common accident, and its impact is relatively large. The article mainly analyzes the reasons for the upward overspeed, and elaborates the requirements of the elevator upward overspeed protection device, and finally analyzes the common upward speed protection device in the market.

Analysis of the cause of elevator overspeeding

1. Brake failure

In elevators, brakes are generally used to control elevator operation, which is an important component to ensure the safety of elevator operation. Failure of the shaft, arm, brake and other parts of the brake will cause its braking effect to decrease or even disappear; loose brake springs or debris on the brake wheel will have a greater impact on the braking ability of the brake; brake coil Damage or chip jam has a direct impact on the braking ability; the brake circuit is burned and the brake cannot work normally. In addition, unqualified brake quality and incorrect design are also the main reasons for brake failure. In addition, the elevator management unit does not do a good job in daily maintenance work, which makes the elevator prone to upward speeding accidents.

2. The traction machine works abnormally

Due to long-term use, the traction sheave rope groove and the traction rope will be seriously damaged. This is mainly due to the fact that the drive of the elevator relies on equipment such as the traction rope and the traction sheave rope groove to realize the elevator drive, and the traction rope and the traction sheave are not regularly maintained. The operation also has a certain impact. The wear of the wire rope will reduce the diameter of the wire rope, and at the same time make the coefficient of friction change and reduce the traction capacity. When the wear is severe, the traction capacity will be seriously affected, and even when the car is stagnant and the counterweight is on the buffer, the traction machine continues to lift the car, causing an upward overspeed accident.

3. The balance coefficient is unreasonable

The balance coefficient has a direct impact on the driving performance of the elevator, and the unreasonable selection of the balance coefficient will cause the tension on both sides of the car to be asymmetrical, which will have a certain impact on the running stability of the elevator. Some studies have pointed out that when the elevator balance coefficient exceeds 0.5, the excessive difference in tension between the two sides of the car will easily damage the stability of the elevator operation and cause the car to appear overspeed in the upward direction. In addition, if the elevator balance coefficient is lower than 0.4 and no compensation equipment is configured, it will also cause an upward overspeed accident.

4. Transmission failure

A transmission is a transition tool between the motor and the traction wheel. During long-term use, some parts of the transmission, such as gears, shafts, turbines, etc., are prone to wear and corrosion. These factors make the transmission in the elevator When braking, the elevator cannot withstand the instantaneous impact force, which causes an upward speeding accident.

In addition to the above factors, damage to various parts of the elevator may cause upward overspeeding.

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