shell

The geometric dimensions of the copper shell formed by chemical deposition on a spherical polyethylene granule were calculated. It is shown that the main factor determining the thickness of the formed copper layer is the initial size of the polyethylene granule. The processes of destruction of the copper shell formed on the polyethylene granule during thermal expansion of the polymer are considered. The values of the limit temperatures in which the copper shell still retains its integrity depending on its thickness are calculated.

The results of experimental studies of copper plating of polyvinyl chloride granules in a chemical precipitation solution are presented. The influence of the surface area of polyvinyl chloride granules on the kinetic regularities of copper reduction and the copper content on metallized granules has been studied. It is established that the surface area of polyvinyl chloride granules has a significant effect on the rate of reduction of copper ions and does not affect the amount of reduced copper.

У статті наведені конструктивні рішення підсилення залізобетонних оболонок баштових градирень із застосуванням попередньо напружених та звичайних зовнішніх залізобетонних ребер або композитних матеріалів, які застосовані на реальних об’єктах України і Польщі.

The design of banding shells of rotary units is analyzed. It is shown that combined welding and cast manufacturing of bandings is used in the case of large structural sizes. The basic materials (30, 35, 25 HSL and 30 HML), being used in this process, are characterized by the tendency of forming of hardening structures due to the thermal cycle of welding. As a result of this, the cracks in the heat-effected zone, which lead to the destruction of the connection under the influence of welding residual stresses.

Determination of the across-section center of the rotary kiln shell and rectilinear of the shell axis by the electronic devises, particully, laser distancers was described.

It is proposed to execute control of linearity of geometrical axis of rotary kilns’ frame by electronic devices. Use of them enhance operativeness and accuracy of measurement.