Brief description:The co-rotating twin-screw extruder consists of several parts including the transmission device, 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 lies in that the twin-screw extruder has two parallel screws placed within a barrel with an "∞" shaped cross-section.
Twin-screw co-rotating extruderComposition: Transmission section and extrusion section.
1. The transmission part provides torque to the screw, and strong torque output is the guarantee for the efficient operation of the twin-screw extruder; the extrusion part is mainly composed of the barrel, screw elements, and core shaft, where the material completes plasticization, mixing, and extrusion.
All of its technological advancements are also concentrated in these two parts, constituting the hallmark of the updates and iterations of twin-screw extruders.
Compared to other models, one of its major features is the difference in the drive system. It requires evenly distributing power to two screws within a limited space, which is known as torque distribution technology. Different torque distribution technologies determine the load capacity of the gearbox and even directly affect the overall machine's lifespan and performance.
The extrusion section is mainly composed of the barrel, screw elements, and core shaft, serving as the functional area for plasticization and mixing in a twin-screw extruder. The screw clearance, volumetric capacity, rotational speed, core shaft strength, and the lifespan of the screw elements are key indicators for evaluating the performance of the extrusion section of a twin-screw extruder.
Maintenance:
1. The extruder equipment should be placed in a well-ventilated area to ensure heat dissipation from the motor, thereby extending its lifespan; the machine should also maintain good grounding.
2. Regularly check the screws of the cutting tools. After using a new machine for 1 hour, use tools to tighten the screws of the moving and fixed blades, as well as their fixation to the blade holder; lubricating oil should be regularly added to the bearings to ensure proper lubrication; to maintain the sharpness of the cutting edges, frequently inspect the cutting tools and ensure their sharpness to reduce unnecessary damage to other components caused by dull or damaged blades; regularly check if the belt is loose and adjust it in time.
3. Restart - Before the second start of the reinforced blade, the remaining scraps in the machine chamber should be cleared to reduce the starting resistance. The inertia cover and pulley cover should be opened regularly to clean the dust outlet below the flange, as the powder material discharged from the crushing chamber may enter the shaft bearing.
4. Replacement of components – When replacing the cutting tools, the gap between the moving blade and the fixed blade should be 0.8mm for shredders above 20HP, and 0.5mm for those below 20HP. The thinner the recycled material, the larger the gap can be appropriately adjusted.
Twin-screw co-rotating extruderMain motor cannot start
1. Cause of occurrence:
Start-up procedure error.
(2) The main motor thread has issues, communication fault
(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; the motor cannot be started if the oil pump is not running.
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).
