新闻资讯

Suddenly falling in mid-air, scared to death, see how the fall preventer saved lives!


There was a video that attracted a lot of people's attention. A tourist in a scenic spot was experiencing an extreme amusement project at high altitude. It can be seen that there is a steel bridge between cliffs, but the bridge deck is made up of spaced wooden boards, and the bottom without wooden boards is the abyss.

This tourist passed quickly on the bridge. At the moment when he just reached the finish line, the safety rope on his back suddenly became unhooked, which made everyone who saw the video feel scared.

Although the scenic spot also declared that this is a marketing tool, people are still scared of this dangerous behavior.

safety catcher

In aerial work, in order to ensure safety, it is mandatory to use safety protection equipment. Usually, belt-type or half-length seat belts are used. In this layer of safety protection, there is only one hook on the seat belt, and there is no buffer. If you fall from a height, belt-type or half-length seat belts will easily cause injuries to people's lumbar vertebrae and other parts.

In addition, when using ordinary seat belts, there will be insufficient safety clearance distance, or frequent use of seat belt hooks will affect work efficiency. In order to solve these problems, fall arresters can be used.

The anti-falling device, also known as the speed difference anti-falling device, is a product that can protect people when falling at high altitude.

The high-altitude anti-falling device mainly uses the speed difference of falling objects for self-control, and it can be hung high and used low. Once we have a high-altitude falling accident, the internal braking system can brake and lock the rope quickly, thus preventing us from falling further.

Anti-falling devices are widely used in high-altitude workplaces such as engineering construction, power maintenance, communication maintenance and bridge maintenance.

Working principle of self-locking anti-falling device

We often see that some workers will wear safety ropes and install a special self-locking anti-falling device when doing special operations at high altitude to prevent sudden falling from high altitude, thus ensuring the safety of personnel.

The self-locking anti-falling device can lock itself immediately when a person falls suddenly and quickly, but it will move along the safety rope at will during normal use. However, when the anti-falling device moves suddenly, it will automatically lock on the safety rope, thus realizing the braking and locking.

This kind of anti-falling device can realize automatic locking, mainly relying on the internal gear. When moving upwards, the braking gear will not rotate, but will rotate along the safety rope during the falling process. When a human body falls, the self-locking device uses the eccentric cam braking principle to quickly lock on the vertical safety rope, thus preventing the human body from falling further.

Working principle of speed difference anti-falling device

When there is no solid structure above the working point to fix the safety rope, and it is not possible to erect the safety belt on the working platform temporarily, and it is also inconvenient to use the safety belt, the differential anti-fall device can be used, which is also a supplement and perfection to the protection of aerial work.

The speed difference anti-falling device is mainly composed of a suspension system and an anti-falling braking system. The suspension system is composed of a hook, a nylon rope and a telescopic safety rope, and the anti-falling braking system is mainly composed of a shell, a ratchet, a steel belt and a pawl.

The speed difference anti-falling device uses the falling speed difference of the object to quickly brake and lock the falling object within a set distance, which requires high hanging and low use.

When in use, only the lifting rope needs to be tied to the structure with firm and blunt edges above, and the iron hook on the wire rope on the fall arrester can be hung into the semi-circular ring on the safety belt.

Within the service radius, that is, during normal use, the steel wire rope is free to expand and contract by the internal steel belt, and it is in a semi-tense state under the action of the internal mechanism, so that the operator has safety guarantee.

If the safety rope slips and falls, the pulling speed of the safety rope will be obviously accelerated, and the internal pawl will block the rapidly rotating ratchet wheel, thus realizing automatic locking, so that the pulling length of the safety rope will not exceed 0.2 meters, so that the falling personnel will not be harmed.

When people stop falling rapidly, that is, the safety hazard is relieved, and the internal mechanism of the fall preventer is unlocked and will automatically resume work.

The speed difference anti-fall device adopts double locking structure, which has stable locking, high safety factor and good reliability, and can effectively solve the accident caused by sudden fall when working at high altitude.

What is aerial work?

The definition of aerial work is that aerial work with a falling height of 2 meters or more is likely to fall.

And specifically, it is stipulated that the slope of the working inclined plane is greater than 45℃ below 2 meters; And below 2 meters, there is no stable foothold on the working ground; Also, if you are below 2 meters and step on a vibrating object, it is also regarded as aerial work.

In aerial work, it is preferred to work directly on a stable ground, followed by standing on a stable and solid working platform, using a movable platform or scaffolding, and a ladder. Except for the first kind of work standing on the ground, other aerial work methods need to use anti-falling equipment.

All the equipment used in aerial work must be qualified, and the aerial work personnel are healthy, old and weak, and it is forbidden to work at altitude for those who are drunk and dizzy and afraid.

Aerial work personnel should wear safety helmets, and they must also use fall-proof safety belts. Safety belt lanyards should be hung high and used low, and tied to solid structural parts, not to moving objects. If it is necessary to move safety belts, a safety rope with double hooks should be used to ensure that there is always a hook hanging on the structural parts in the process of moving the safety rope to ensure the safety of personnel.

The picture in this article is taken from YouTube's Free Fall Distance-3D Animation.

Gif in this paper is taken from YouTube "Asap Asap Lock Mobile Fall Arrester for Rope".

The popular science article was transferred from Weibo's article on @ Manufacturing-Principle.