Brief description:The co-rotating twin-screw industrial extruder consists of several parts including the drive unit, feeding device, barrel, and screws. The functions of each component are similar to those in a single-screw extruder, as shown in Figure 1. The difference from a single-screw extruder is that the twin-screw extruder has two parallel screws placed within a barrel with an "∞" shaped cross-section.
Co-rotating screw industrial extruderPrecautions:
1) No metal objects should be allowed to enter the hopper to avoid damaging the screw.
Before starting the machine, the screw must be turned to rotate for more than one full turn.
3) Normal operation, the host running at low speed without load should not exceed 2 minutes.
4) No one should stand in front of the machine head when starting, to prevent injury from ejected materials.
5) Set the process conditions according to the operation records without exceeding the speed limit;
6) During cleaning, avoid letting water or oil enter the electrical control cabinet, and do not pull or touch any wire ends to prevent loosening and moisture.
7) Regularly check all lubrication points, including forced oiling and pressure lubrication using oil cups;
8) Pay attention to the changes in the soft water quality, and if it turns black, it should be replaced promptly.
9) When straightening the material strips, use your hand or a plastic strip, not a metal strip;
10) Do not touch any rotating parts of the equipment.
Co-rotating screw industrial extruderFrequently Asked Questions and Solutions:
The main motor cannot start
1. Cause of occurrence:
Start-up procedure error.
(2) There is an issue with the main motor thread, communication failure
(3) The interlock device associated with the main motor is activated.
2. Processing Methods:
(1) Check the procedure and restart the machine in the correct sequence.
(2) Check the main motor circuit.
(3) Check if the lubricating oil pump has started, and inspect the status of the interlock devices related to the main motor; if the oil pump is not on, the motor cannot be started.
(4) Check if the emergency button has been reset.
II. Unstable Main Motor Current
1. Cause of occurrence:
Feeding is uneven.
(2) A certain heater malfunctioned and did not heat.
(3) The screw adjustment pad is incorrect, or the phase is wrong, causing component interference.
2. Treatment Methods:
Check the feeder and troubleshoot.
(2) Check if all heaters are working properly, and replace them if necessary.
(3) Check the adjustment pad, pull out the screw to inspect for any interference.
III. The starting current of the main motor is too high
1. Cause of occurrence:
Insufficient heating time, high torque.
(2) A certain heater is not working.
2. Processing Methods:
Before starting, manually turn the machine. If it does not turn easily, extend the heating time or check if each section of the heaters is working properly.
IV. Inconsistent discharge or blockage at the die head
1. Cause of occurrence:
The heater in a certain section is not working, leading to poor plasticization of the material.
(2) The operating temperature is set too low, or the molecular weight distribution of the plastic is wide and unstable.
(3) There may be foreign objects that are not easily melted.
2. Treatment Methods:
Check the heater and replace if necessary.
(2) Verify the set temperatures for each section, and if necessary, consult with the process engineer to increase the temperature settings.
(3) Clean and inspect the extrusion system and die head.
V. Unstable Head Pressure
1. Cause of occurrence:
The main motor speed is uneven.
(2) The feeding motor speed is uneven, causing fluctuations in the feeding amount.
2. Treatment methods:
Check the main motor control system and bearings.
(2) Check the feeding system motor and control system.
VI. Low lubricating oil pressure, oil pump alarm
1. Cause of occurrence:
Lubricating oil is insufficient.
(2) Pipe blockage, the filter has not been cleaned on schedule.
(3) Oil pump damage
2. Processing Methods:
Check and add the correct grade of gear oil.
(2) Check the oil lines and filters and clean them.
(3) Check the oil pump and replace if necessary
VII. The nylon pin is cut off
1. Causes:
The torque of the extrusion system is too high.
(2) The main motor and the input bearing are not concentric.
2. Processing methods:
(1) Check if any metal or other objects have entered and jammed the screw in the extrusion system. When it first occurs, check whether the preheating warm-up time or temperature increase value meets the requirements.
(2) Adjust the main motor.
Extrusion output suddenly decreases
1. Cause of occurrence:
The feeding system has malfunctioned or there is no material in the hopper.
(2) The extrusion system has entered a hard lock-up state, preventing the material from passing through.
2. Processing Methods:
Check the material level in the feeding system or hopper.
(2) Inspect and clean the extrusion system.
Nine, inaccurate temperature control
Causes of occurrence
Temperature controller is not functioning properly
(2) The thermocouple is not making good contact
(3) The cooling system is not functioning properly.
2. Processing Methods
Check the temperature control meter's wiring and parameters, and if necessary, perform auto-tuning or replace the instrument.
(2) Check if the thermocouple is in good contact
(3) Check if the corresponding solenoid valves are operating normally, and ensure that the water lines are unobstructed.
10. Insufficient vacuum or not functioning
Causes of occurrence
Vacuum pump failure
(2) Pipe leakage, blockage
(3) The material does not form a closed cavity
2. Treatment Methods
Check the vacuum pump and ensure that the circulating water is flowing smoothly. The exhaust piping should not be reduced in size.
(2) Check if there is any leakage or blockage in the pipelines, and reinstall if necessary. Pay special attention to the sealing gaskets.
(3) Check if gas is being sucked in at the opening position, and modify the screw structure if necessary.
Eleven, sudden power failure when the extruder is operating normally
Treatment method:
Immediately turn off the main switch of the extruder, and manually rotate the extruder motor by hand or with a crank to discharge as much material from inside the extruder as possible, minimizing the residue in the barrel. If the main motor of the extruder is directly connected to the gearbox and there is no mechanism for cranking the motor, increase the cooling water in the cooling system to rapidly cool down the barrel and screw of the extruder, preventing the material inside from degrading.
Nanjing Xintuo Intelligent Equipment Co., Ltd. was established on May 29, 2020, with Zhou Xianting as the legal representative. The registered capital is 10 million RMB, and the unified social credit code is 91320113MA21LF2H92. The company is located in the Baima Town Industrial Concentration Zone, Lishui District, Nanjing City. It belongs to the other manufacturing industry. Its business scope includes: Permitted projects: import and export of goods; import and export of technology (projects that require approval by relevant departments can only be carried out after obtaining such approval, specific business items are subject to the approval results). General projects: sales of intelligent material handling equipment; research and development of machinery and equipment; general equipment manufacturing (excluding special equipment manufacturing); specialized equipment manufacturing (excluding licensed specialized equipment manufacturing); sales of metal products; wholesale of electronic components; sales of instruments and meters; sales of artificial intelligence hardware; processing and sales of mechanical parts and components; general component manufacturing; sales of plastic products; production and sales of Class I medical devices; sales of Class II medical devices; sales of health supplies and disposable medical supplies; sales of special labor protective equipment; technical services, technical development, technical consultation, technical exchange, technology transfer, and technology promotion (except for projects that require approval, activities can be conducted independently according to the business license). The current operating status of Nanjing Xintuo Intelligent Equipment Co., Ltd. is active (in operation, open, registered).
