The extrusion granulator unit is highly integrated with the machine, electricity and instrument, and the level of automation control is high. Therefore, in the actual operation, there will be more faults that are difficult to diagnose, resulting in too long processing time, which affects the normal operation of the whole polypropylene plant and greatly reduces the production economic benefits. Combining the theoretical knowledge of extrusion granulation production process and the management experience of actual production operation for more than ten years, the author analyzes and judges the common causes of failures in the operation of the unit, and has formulated corresponding solutions and treatment methods to ensure its Long-term stable operation.
The cause of the failure is in the extrusion granulation unit, which causes the friction cleavage unit to disengage during operation. The reasons for the interlocking of the unit can be divided into four categories:
Main motor system failure
1. The main motor torque is too high or too low; 2. The main motor speed is too low; 3. The main motor bearing temperature is too high; 4. The main motor winding temperature is too high; 5. The main motor water-cooled cooler inlet and outlet temperature is too high; 6, the main motor bearing lubricant pump outlet flow is too low; 7, the main motor bearing lubricant pump outlet pressure is too low; 8, the main motor water-cooled cooler water leakage is too high.
Transmission system failure
1. The gearbox shift lever position is deviated; 2. The instrument wind pressure of the friction clutch is too high; 3. The friction clutch speed difference is too large; 4. The gearbox lubricating oil pump outlet pressure is too low; 5. The gearbox lubricating oil pump outlet oil temperature is too high. High; 6, internal friction clutch failure.
Extrusion granulator screw process section failure
1. The melt pressure before and after the throttle valve is too high; 2. The melt pressure of the machine head is too high; 3. The melt pressure difference before and after the change of the screen is too large; 4. The rotation of the driving valve is faulty.
Underwater pelletizing system failure
1. The temperature of the grain-cutting motor winding is too high; 2. The speed of the pelletizer is too low; 3. The torque of the pelletizer is too high; 4. The automatic switching of the particle water bypass is faulty; 5. The water pressure of the pellet is too high or too low; The flow rate of the granule water is too low; 7. The clamping bolt of the granulator is not tight; 8. The bypass valve of the granulating chamber is not closed; 9. The hydraulic clamping pressure of the granulator is too low; 10. The granulating motor is faulty; 11. The axial cutting pressure of the hydraulic cutter is too low.
Among the above-mentioned fault causes, the frequency of occurrence is more: the main motor torque of the main motor system is too high or too low; the friction clutch of the transmission system is faulty; the melt pressure of the system of the extrusion granulator screw process section is high; Granulator system failure, etc. The following is a detailed analysis of these common causes of failure, and the corresponding solutions are given.
The cause of the failure is in the extrusion granulation unit, which causes the friction cleavage unit to disengage during operation. The reasons for the interlocking of the unit can be divided into four categories:
Main motor system failure
1. The main motor torque is too high or too low; 2. The main motor speed is too low; 3. The main motor bearing temperature is too high; 4. The main motor winding temperature is too high; 5. The main motor water-cooled cooler inlet and outlet temperature is too high; 6, the main motor bearing lubricant pump outlet flow is too low; 7, the main motor bearing lubricant pump outlet pressure is too low; 8, the main motor water-cooled cooler water leakage is too high.
Transmission system failure
1. The gearbox shift lever position is deviated; 2. The instrument wind pressure of the friction clutch is too high; 3. The friction clutch speed difference is too large; 4. The gearbox lubricating oil pump outlet pressure is too low; 5. The gearbox lubricating oil pump outlet oil temperature is too high. High; 6, internal friction clutch failure.
Extrusion granulator screw process section failure
1. The melt pressure before and after the throttle valve is too high; 2. The melt pressure of the machine head is too high; 3. The melt pressure difference before and after the change of the screen is too large; 4. The rotation of the driving valve is faulty.
Underwater pelletizing system failure
1. The temperature of the grain-cutting motor winding is too high; 2. The speed of the pelletizer is too low; 3. The torque of the pelletizer is too high; 4. The automatic switching of the particle water bypass is faulty; 5. The water pressure of the pellet is too high or too low; The flow rate of the granule water is too low; 7. The clamping bolt of the granulator is not tight; 8. The bypass valve of the granulating chamber is not closed; 9. The hydraulic clamping pressure of the granulator is too low; 10. The granulating motor is faulty; 11. The axial cutting pressure of the hydraulic cutter is too low.
Among the above-mentioned fault causes, the frequency of occurrence is more: the main motor torque of the main motor system is too high or too low; the friction clutch of the transmission system is faulty; the melt pressure of the system of the extrusion granulator screw process section is high; Granulator system failure, etc. The following is a detailed analysis of these common causes of failure, and the corresponding solutions are given.
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