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, which is then carried out on a special device of ten-balcony
type of ABC head. In order to weld shells of various
diameters, the balcony can be displaced in a vertical
direction at a speed of 1.85 m/min. The load-lifting
capacity of the balcony is 1000 kg. After the outside
welding the shell is calibrated on the three-roller roils 11
and is transferred to the x-ray room for quality control of
the welding seam.
In order to prevent the half-finished shells from
rolling by themselves along the rails, in front of each
working post the rails are provided with stopping devices
12 with interceptors. A pneumatic drive enables the
stopping devices to hold the shells on the inclinded rails
and to let them pass, one at a time, to the working stand.
The working stands are provided with outstanding driving
roller-bearings 13 with rubbercoated rollers which make it
possible to hold the shells in the necessary position with
the help of electric drives. All transportation of the
half-finished shells between the individual operations is
carried out without the electric overhead crane, thus
reducing time losses between operations.
The industrial introduction of the over-all mechanized
assembly line permitted a considerable acceleration of the
shell production cycle; it made work easier and eliminated
one of the bottle-necks in the industrial production of
chemical apparatus.
The present efforts of the work's collective are aimed
at the construction of a second assembly line producing
vessels from shells; such a line would permit a complete
mechanization of the entire production process of the
vends of chemical apparatus in the plant.
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英文题目二 Robot based system for the automation of
