Posted by
useongroup on Thursday, June 18, 2009 6:51:19 AM
The composition of
extrusion machines:
Plastic
extrusion machine is the host, which is extrusion system, transmission system and the
heating and cooling system.
Extrusion system including
the screw, barrel, hopper, nose, and die, plastics extrusion systems through
plastics melt into a uniform, and in the process established under the pressure,
the screw continuous extrusion die.
(1) screw: it is the most important
parts of the extruder, which extruder is directly related to the scope of
application and productivity, from high-strength alloy steel made of
corrosion-resistant.
(2) Barrel: a metal cylinder, the general use of
heat-resistant, high strength, strong wear resistance, corrosion-resistant alloy
steel or alloy steel lined composite steel pipe made of. Barrel and screw with
the crushing realization of the plastic, softening, melting, plastics, exhaust,
and compaction, and to evenly transfer molding system for plastic material,
generally the length of its barrel diameter of 15 ~ 30 times in order to be
fully plastic heating and the principle of full plastics.
(3) hopper: hopper
at the bottom with cut-off device, in order to adjust and cut off the material
flow, as the hopper with the side hole and metering device calibration.
(4)
head and die: inside the nose by the sets of alloy steel and carbon steel jacket
structure, there is mold inside the nose, the role of head rotation is to melt
the plastic into a parallel straight-line movements, steady uniform Import
module sets and give the necessary molding plastic pressure, plastic bins in the
machine Plasticating compaction, porous plate by the flow along a certain flow
of the nose through the nose neck mold, mold core set of appropriate to form a
cross-section of the annular gap decreases, so that the core line of plastic
melt in the surrounding dense tubular continuous coating. Nose in order to
ensure a reasonable flow of plastic to eliminate the accumulation of plastic
corners, often have a shunt placement sleeve, plastic extruder to eliminate
pressure fluctuations, but also pressure settings are Central. Machine is also
equipped with a die head and adjust the device calibration, easy adjustment and
calibration, and core concentricity of the die sets.
Extruder die in
accordance with the material flow direction and the angle between the centerline
of screw will head into the head angle (angle of 120o), and at right angles to
the head. The nose of the shell is fixed with bolts in the machine body, the die
head core sitting there, and a fixed nut in the nose into the line port, the
front seat core with core, core and core block the center of a hole for the line
through the core; in the front nose ring with pressure are used to balance
pressure; squeeze forming part of package sets from the mold and die sets of the
composition of blocks, the location of die sets can be bolted through the
support to adjustment mode to adjust the sets of the relative positions of core,
easy to adjust the thickness of the clad extrusion uniformity. Head equipped
with external heating device and temperature measuring devices.