The principle of parachute (belt)! ! ! ! !

The principle of parachute is to use air resistance to slow down the descent speed.

The main components of a parachute are a canopy, a guide umbrella, a rope, a strap system, an opening and an umbrella bag. It consists of textile materials such as umbrella silk (made of silk, cotton cloth and nylon fabric in the early days), umbrella rope, umbrella belt and umbrella thread, as well as some metal parts and rubber parts. Umbrella rope adopts hollow or braided rope with core, which requires compact structure, high strength, softness, good elasticity and small uneven elongation.

The umbrella belt is used as the reinforcement belt and sling system of the umbrella clothing. Umbrella rope is the skeleton of umbrella clothing, which requires light weight, softness, high strength and high elastic modulus, less than the elongation at break of umbrella clothing fabric.

The umbrella belt adopts double-layer or three-layer fabric thick belt, which requires high strength and breaking work. Umbrella thread is the connecting material for sewing umbrella thread, umbrella belt and umbrella rope, which requires high strength, good lubrication and even and stable twist.

Extended data

Parachute is commonly known as "safety umbrella". Parachutes are widely used in the aerospace field, and their main purposes are:

(1) Emergency rescue. Mainly used to save the pilot's life when the plane crashes;

(2) stabilizing effect. Keep the attitude of the aircraft ejection seat stable and the refueling machine of the aerial tanker stable;

(3) slow down. The braking deceleration when the plane landed and the stagnation deceleration of various aviation bombs and parachutes. Parachute can shorten the landing glide from more than 2000 meters to 800 ~ 900 meters;

(4) recycling. Used for air recovery of aircraft, such as unmanned aerial vehicles, test missiles, launch vehicle boosters, high-speed detectors and recoverable spacecraft. There are also recycling equipment on spacecraft and hot air balloon detectors;

(5) air drop. Paratroopers airborne, all kinds of materials and weapons airdropped;

(6) air movement. Such as skydiving, hillside gliding, hanging wing gliding, power flight, traction lift-off, etc.

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