| 摘要 |
<p>Apparatus for coating the interior walls of pipes with a material which comprises two or more constituents to be mixed in correct proportions within the pipe to be coated, the constituents being fed to a mixing and distributing device within the pipe to be coated by respective positive displacement pumps, is modified in that the operation of said two pumps is controlled by pre-set adjustment elements usable selectively according to the diameter of pipe to be coated and the thickness of coating required. The adjustment elements take the form of screws 86 mounted on indexable heads 76, 77, the selected screw abutting the ends of piston rods 56, 57 so as to cause reversal of the pneumatic rams 54, 55 upon actuation of switches 62, 63 associated with changeover valves. <IMAGE></p> |
