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(5) Installation order of sealing element of bearing pedestal at feeding end:
As shown in Fig.6-4, install two pieces of Part #30 (O-ring180×3.55) and one piece of Part
#31(wearing sleeve I) on the main shaft and grease Part #30;
Install Part #25 (O-ring 345×7) on Part #24 (Front end cover), and install two pieces of Part
#27(lip-shaped oil seal180×210×15) near the bearing side on Part #24. Then install Part #24 on Part
#12(bearing pedestal). Grease the sealing ring and oil seal after installation.
(6)Installation order of sealing elements of bearing pedestal at belt pulley end:
As shown in Fig.6-4, install two pieces of Part #8(O-type sealing ring145×5.3)on Part #7(wearing
sleeve II), and grease Part #8;
Install above subassembly of Part #8 and Part #7 on the main shaft;
Install two pieces of Part #2(oil seal170×200×15)on Part #3(rear end cover), and grease Part #2;
Install Part #1(O-ring 258×7) on Part #3 and grease Part #1before putting Part #3 on Part #12
(bearing pedestal).
6.7 Malfunction and troubleshooting
Trouble
Temperature of extruder
barrel fails to reach the
required temperature.
Temperature
conditioning fails to meet
the requirement.
Products look rough with
uneven lengths
Throughput decreases
Material
cannot
discharged in a sudden
during normal operation
Uneven
discharge
Insufficient expansion
Excessive
Table 6-6
Malfunction and troubleshooting
Causes
Steam conditioning temperature is
low.
Steam
pipeline
blocked.
The inlet of steam pipeline in
extruder barrel is blocked
of
Steam pressure is not enough
Steam pipeline is blocked
Poor conditioning.
Some die plate holes are blocked
Ground particle size too coarse.
Bad quality of die plate
a) Pressure ring or wear ring is
worn out;
b) Screw head is seriously worn
out.
be
Excessive feeding in short-time or
feeding cut-off.
Blocked die holes
intermittent
Low filling degree of extruder
barrels
Insufficient gelatinizaiton
expansion
Excessive temperature.
Troubleshooting
Raise conditioning temperature to
make
of
Jacket
is
80℃-90℃ after conditioning.
Clean the steam pipeline of jacket.
Clean
extruder barrel.
Check steam pressure. Adjust it to
normal 4bar
Clean the steam pipelines
Enhance material conditioning.
Stop production and clean the die
plate
Improve grinding for finer particles
Use the die plate made by the
reputable manufacturer
a) Replace wear ring or pressure
ring
b) Replace screw head
Stop
correct.
Increase feeding.
Increase feeding
Raise the conditioning temperature
Raise
temperature
Increase the rotary speed of main
motor
Decrease the temperature.
70
material
temperature
the
steam
pipeline
production
to
check
the
jacket
heating
to
into
and
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