At the beginning, everyone used animal skin stitches to form a tubular layout to get used to the needs of production struggles. After an appropriate period of time, by the end of the seventeenth century, the Dutch Vandelgekin brothers made longitudinally stitched canvas hoses, which were widely used in firefighting affairs at that time. Later, with the appearance of rubber on the world market and the development of its vulcanization process, hoses and hoses armored with fabrics such as metal wire or hemp rope were released. However, some high-temperature media such as steam and hot air in the project, such as liquid hydrogen, low-temperature media such as liquid oxygen and liquid helium, gasoline, kerosene, acids, alkalis, and other corrosive media, are of course not transportable by hose. Especially under high temperature conditions, its safety is more difficult to guarantee.

As a result, everyone gradually focused their attention on the metal pipe and changed the shape of the metal pipe so that the corresponding ripples occurred on the surface of the surface. In this way, it not only has the same flexibility as the hose, but also has the functions of high temperature resistance, low temperature resistance, aging resistance and corrosion resistance. Therefore, the metal bellows, which is the body of the metal hose, broke out in this way.

In 1855, Germany first announced the patent for making bellows. It uses the existing principles of making jewelry to make bellows. Thirty years later, E. Levavaseur of France and H. Witzenmann of Germany collaborated on the development of new metal bellows. In August 1885, they obtained the patent rights of France and Germany.

This is a spiral non-corrugated tube made of metal tape with an S-shaped cross-section wound on special equipment. They are filled with rubber tape, cotton fabric or asbestos rope at the adjacent two turns of the bite to facilitate the corrugated tube. Sealing of the cavity.

In 1894, the layout of this type of bellows was improved: everyone used two metal bands with different diameters to wind them in opposite directions. In this way, the metal belts reach balance with each other under the force state, overcoming the disadvantage of self-opening.

In 1929, the layout of the bellows entered another technical revolution, which completely solved the problem of the loss of the sealing function of the stainless steel metal hose due to uneven changes in the groove of the cushion rubber band or asbestos rope when it twists and turns , And then pioneered the broad perspective of the bellows. All the bellows made of steel and copper-zinc alloy materials are ready for use

Corrugated pipes made of seamless or welded pipes rely on the elastic deformation of the corrugated side walls to maintain a certain compressibility or stretchability. Together, the tube is tightly sealed.

From the beginning of the 1950s, double-layer, three-layer, and multi-layer corrugated pipes, especially ultra-thin wall stainless steel corrugated pipes, developed rapidly. In order to satisfy the application requirements, we use various processes such as welding, electroforming, machining, hydraulic and mechanical spinning to make bellows. The minimum nominal diameter is 2 mm, the maximum nominal diameter is

Up to 400-500 mm, and even a giant bellows with a diameter of 10 meters. The number of corrugations is at least l ~ 2, up to several hundred, thousands, and even tens of thousands.

In terms of the important significance of the bellows as the body of the metal hose, the development of the metal bellows means the development of the metal hose.

After that, everyone covered the outer surface of the corrugated pipe with rubber, plastic or nylon, etc., and armored the mesh sleeve made of metal wire or metal tape to change various joints. In order to get used to the different needs under various application conditions, invented various ways of metal hoses.

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