The products of McCracken company of the United States and Hess company of Germany have the advantages of fast molding, convenient mold replacement, simple maintenance, no waste residue and covering Φ 300mm~ Φ 1200mm concrete pipe of all sizes. The radial press Rp series vertical radial extrusion pipe making machine of Hess group in Germany can produce up to Φ 2500mm concrete drain pipe up to 6000mm long, its production Φ 300 mm, 3.5 m long cement pipe needs only 90 ~ 100 s for production Φ 1200mm and 3.5m long cement pipe only needs 180s ~ 200s.
Due to the lack of technology accumulation and the technical limitations of developed countries, imitation was mainly used in China in the early stage. On the basis of existing manufacturing technology and equipment, more mature technology was gradually realized through the accumulation of experience. In the 1980s, the vertical radial extrusion pipe making process was introduced and developed by ourselves. In the 1990s, a set of vertical radial extrusion technology and equipment were introduced from McCracken in the United States and ZUBLIN in Germany to manufacture concrete and reinforced concrete drainage pipes. In the mid-1990s, Shandong Cement Research Institute developed 2G series variable speed vertical extrusion pipe making machine after years of research. This achievement won the provincial and ministerial scientific and technological progress award. The machine has multi-level variable speed to adapt to the optimal speed necessary for the production of a variety of pipe diameters, which can not only produce Φ 150mm~ Φ 1000mm series of water pipes, and can also produce 2-6-hole cable pipes, with the function of one machine and multi-purpose. In 2010, a new generation of equipment was re introduced and developed. At present, Macpex machinery which has developed pipe making equipment such as core die vibration, is developing a new vertical radial extrusion pipe making machine.
At present, in addition to the development and improvement of vertical radial extrusion technology, the production of vertical radial extrusion pipe making machine is also moving towards automation and diversification. The touch screen can greatly simplify the operation process through rich pictures and operation options, and the data storage and viewing function can accurately indicate the defects and deficiencies in production for improvement.
