英文题目一Overall-mechanized assembling line for Production in the uzbekkhimmash works Shell
翻译内容
The process of shell production applied in the Uzbekkhimmash Works involves a great number of adjusting and transporting operations. The latter are carried out with the help of electric overhead cranes which lengthens the production cycle. To eliminate these deficiencies according to the VNIIPTkhimnefteapparatury, an overall-mechanized assembling line was constructed and introduced in the plant; it is used in the production of boiler sheels of diameters from 600 to 2200mm, lengths up to 2000 mm and wall thicknesses up to 20 mm, of carbon steel and high-alloy steels (Fig. 1). A sheet with the planned edges is brought by crane to the mechanized roll-type conveyer 1 which transfers it to the hydraulic press 2 in which the edges are bent.
The press generating loads of 360 tons is provided with a rotary plunger guaranteeing a bending with the necessary radius of curvature. After the bending of the first edge the sheet passes through the press where the second edge is bent. The die is provided with special hinged props for accurate orientation of the sheet's edges relative to the press.
The sheet with the bent edges is transferred along the roll-type conveyer 3 to a three-roller sheet-bending roll. The conveyers 1 and 3 are controlled from the press control desk; in addition to this the conveyer 3 is controlled from the roller control desk. Inconsistent operation of the conveyers is excluded by a blocking mechanism. The rolls 4 bend the sheet according to the radius of the future shell until the ends of the sheet meet. With the help of the lifting mechanism 5, which is of the form of a runway crane along which two coupled telphers with the load-lifting mechanism move, the half-finished shell is transferred from the roils to the inclined assembling
rails 6 (Fig. 2). The hoisting mechanism is provided with remote control operated by the worker himself.
The half-finished shell then moves along the inclined assembling rails (angle of slope 45') under its own weight. The total length of the rails is 49 m.
Fig. i. Overall-mechanized assembly line for the production of boiler shells, 600-2200 mm in diam: a) schematic
diagram, b) general view.
Fig. 2. Assembling rail with the boiler shells on it.
On stand 7 the shells are assembled and prepared for inner welding of the longitudinal butt. The automatic welding of the longitudinal butt is carried out from inside the shell, on a pneumoflux cushion under a layer of fusing agent by a special eight-pole arrangement. The range of the poles is 2500 mm, the diameter of the electrode wire is 3 mm and the welding rate is 10-50 m/h.
After the inner longitudinal seam has been welded, the half-finished shell is transferred to stand 9 where the seam roots are dressed. On this stand the longitudinal butt of the shell is prepared for welding on the outer side,
