Apparatus for manufacture of corrugated pipes

摘要

An apparatus for manufacture of corrugated pipes by the plastic working method comprises a stand-mounted assembly for clamping and sealing a pipe blank, devised in the form of two clamps arranged coaxially at a certain distance from each other to insert the pipe blank, and furnished with a hydraulic drive. The apparatus also incorporates a device for axial compression, and tools disposed symmetrically in relation to the direction of compression and reciprocating laterally to said direction for embracing the pipe blank. The apparatus contains a device for feeding shaping fluid into the pipe blank. The hydraulic drive according to the present invention comprises hydraulic cylinders, each having a movable link provided with a through passage and mechanically coupled with the respective clamp. The hydraulic drive includes a double-acting pneumohydraulic booster, the hydraulic chambers whereof communicate with hydraulic cylinder chambers through a hydraulic distribution gear, and the pneumatic chambers whereof communicate with a source of compressed gas. The axial compression device comprises at least one pneumohydraulic booster and a two-position pneumoelectric distribution valve, the outlet whereof communicates with a pneumatic chamber of the pneumohydraulic booster for controlling travel of the other link in one of said hydraulic cylinders which effects axial compression of the pipe blank, and the inlet whereof is connected to the compressed gas source. The shaping fluid feeding device incorporates a two-position hydraulic distribution valve, the inlet whereof communicates with hydraulic chambers of the double-acting pneumohydraulic booster through the distribution gear, and the outlet whereof is connected to a pressure regulator. A hydraulic distribution and adjustment gear connects the pressure regulator to a source of shaping fluid and to the internal space of said pipe blank through the through passage provided in the movable link of the other hydraulic cylinder.