Armored corrugated pipes refer to expandable tubular products made of plastic. Plastic corrugated pipes save materials, are light in weight, and have excellent physical and chemical properties. They are widely used in civil buildings, municipal projects, and highway bridges. The armored corrugated pipe is a corrugated pipe. The common metal corrugated pipe is carbon steel. The stainless steel or inner layer is plastic. The outer layer is galvanized metal. The metal corrugated pipe can be used for small angle rotation, transmission and expansion. It is widely used in electric power, machinery industry and other industries. Now let's know the forming process of the lower armored corrugated pipe.
Armored corrugated pipes are classified according to forming technology. Corrugated pipes are mainly divided into hydraulic forming corrugated pipes, rolling forming corrugated pipes, mechanical expansion corrugated pipes, and stacked forming corrugated pipes. Hydroforming is a common and widely used forming method for corrugated pipes. It is mainly used to manufacture annular corrugated pipes, which can form corrugated pipes with a wall thickness of 0.08~4mm. Hydroforming is to expand and compress the pipeline under the pressure of the liquid in the pipe blank to form a corrugated pipe. This forming technology is often used for small diameter metal corrugated pipes.
Armored corrugated pipes depend on the rolling of the forming wheel set on the pipe blank. However, some corrugated pipes can only roll one corrugated pipe at a time, and some can only roll several corrugated pipes at a time. This technology is mainly used for the manufacturing of large corrugated pipes. Stacking forming is carried out by stacking corrugated pipe materials on the core to dissolve the core. This process is generally used to manufacture metal corrugated pipes with low hardness and high manufacturing cost.
The armored corrugated pipe adopts the extrusion one-time molding technology. The raw materials are mostly made of high-density polyethylene (HDPE) plastic, which has strong corrosion resistance and long service life. The polyethylene plastic prepared in the production process and several additives are put together. The raw materials after being sent to the machine for mixing are sent to the extruder, which is heated to 230 at high temperature. The plastic particles are dissolved, and the viscous liquid is extruded.
The forming die of armored bellows consists of hundreds of pairs of left and right modules, which can be continuously manufactured by closing and opening each module cycle. When the extrusion die head enters the cavity, the forming chamber of the corrugated pipe is formed with the closing of each die. After the extruder injects molten polyethylene plastic into the mold, the solution quickly fills the texture. As the die moves forward, the cooling system in the die hardens the corrugated pipe for forming. Each die automatically opens for demoulding. The die moves forward and the corrugated pipe continues to be circularly formed.
Then, the armored corrugated pipe uses water-cooled spray to completely harden the plastic, and the long corrugated pipe will continuously extend. The rotation of several toothed turntables can drill holes in the grooves around the bellows, which generally increase the drainage area. The corrugated pipe surface is wrapped with filter cloth for hot pressing, which can prevent the drain hole from being blocked.