What are the classifications and structures of double screw extruders?
Ⅰ. Temperature control system of the double screw extruder
1. The temperature of a certain section of the host is too high
(1) Cooling system failure
① Check whether the solenoid valve is normal, and under normal circumstances, disassemble the solenoid valve core and blow with an air pump;
②Whether the water pipe or cylinder is blocked.
(2) The temperature control meter fails
①Whether the OUT2 light of the high temperature section is on;
②The shut-off valve is opened too small.
(3) The solid state relay or bidirectional thyristor is damaged: replace the solid state or thyristor.
(4) The screw shear is too strong: appropriately weaken it.
2. The temperature of a certain zone of the main machine of the double screw extruder is too low
(1) The temperature control meter fails: whether the OUT1 light is on when the temperature is too low;
(2) The heater power is too small or the heater half is damaged or short-circuited;
(3) The shut-off valve is opened too much, disassemble the solenoid valve core and blow with an air pump.
Ⅱ. The host system of the double screw extruder
Automatic parking:
1. Oil pump failure: check whether the motor protection switch has tripped;
2. Melt pressure alarm: check whether the melt pressure alarm value is correct; change the net of the machine head; the temperature of the machine head is low;
3. The ammeter exceeds the limit: increase the speed of the main engine; reduce the feeding amount;
4. Reduce governor failure: check the cause and reset after handling;
5. Whether other auxiliary equipment linked with it alarms.
Ⅲ. The feeding system of the double screw extruder
Automatic shutdown: Whether the governor is faulty; the speed of the feeder is too low; the material is too large; whether the feeding screw is suitable for the material.
Ⅳ. The lubrication system of the double screw extruder
The oil pump does not work: check the wiring; check the motor switch.
Ⅴ. The cooling system of the double screw extruder
1. The water pump does not work: check the circuit; check the motor switch;
2. The cooling water does not pass: the water pump does not work; the water volume is insufficient; whether the water pressure is between 0.2-0.4MPa.
Ⅵ. The vacuum system of the double screw extruder
1. The vacuum pump does not work: check the circuit; check the motor switch;
2. There is no indication on the vacuum gauge:
(1) The valve is not opened;
(2) There is really a leak;
(3) The water intake of the vacuum pump is too small;
(4) The vacuum chamber is blocked.
Ⅶ. The hydraulic station system of the double screw extruder
No pressure: the overflow valve core is blocked; the hydraulic oil is too little; the seal is damaged; the oil filter is damaged.
Ⅷ. The problems that will occur in the operation of the twin-screw extruder machine
1. The gearbox produces oil foam: too much oil is added; the gearbox is not ventilated.
2. The screw plasticization effect is not good: the screw combination of the twin screw extruder machine is too weak; the screw is worn out seriously; the temperature is not suitable.
3. Material emission from vacuum chamber: the main engine speed is too fast; the screw combination is unreasonable; the plasticization of the material is not good.
4. Frequently broken strips: the material is not well plasticized; there are too many impurities in the material; the vacuum is not enough, and there are too many pores.
5. The material is too wet: discharge the water early; move the position of the blow dryer and the pelletizer backward; reduce the speed of the main engine and the pelletizer.
6. The material is too biased: the temperature of the material is too high; the air pressure of the pelletizer is too large.
7. The length of the particles is different: the die is blocked; the temperature of the die is uneven.
8. Hot-cut and easy-to-block pipes: the material temperature is too high; add a section before the tee; the angle of one-meter straight pipes and elbows should not be too large.
9. The pelletizer can't hold down the strips: check if there is air pressure.
10. Particles with burrs: Check whether the cutter of the double screw extruder machine is flush with the die; the gap between the fixed knife and the movable knife.
11. The temperature of the water tank is too high: check whether the external circulating water is flowing; the position of the water tank is too low.
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