Email:sales@jinbeiextruder.comQingdao Jeebo Machinery Co.,Ltd

Qingdao Jeebo Machinery Co.,Ltd

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Qingdao Jeebo Machinery Co.,Ltd

Add: No.15, Guangdong Road, Beiguan Industrial Park, Jiaozhou City, Qingdao, China

Tel: +86-532-82287388

Представительство в РФ: (423)249-22-82 

Mobile: +86-13792822973(wahtsapp available)

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What Is The Difference Between Parallel And Conical Twin-screw Extruder

                     Difference between Parallel and Conical Twin-screw Extruder

1. Diameter: The diameter of the parallel twin screw is the same, and the diameter of the small end of the conical twin screw is different from that of the big end.
2. Concentricity: The center-to-center distance of the flat twin-screw is the same, and the two axes of the conical twin-screw are at an included angle. The size of the center distance varies along the axis.
3. Length-diameter ratio: Parallel double screw (L/D) refers to the ratio of the effective length of the screw to the outer diameter of the screw, and conical twin screw (L/D) refers to the length of the effective part of the screw and the diameter of the big end and small The ratio of the average of the end diameters.
From the above, we can clearly see that the most significant difference between the parallel and conical twin-screw extruders is that the screw barrels have different geometry, which leads to many differences in structure and performance, although the characteristics of the two are different. But there are their own advantages.
Parallel twin screw extruder:
Due to the small size of the center distance of the two screws, the space for the radial bearings and the thrust bearings supporting the two output shafts and the associated transmission gears in the transmission gearbox is limited. Although the designers have exhausted their brains, they cannot solve the problem. The bearing bearing capacity, the modulus of the gear, the small diameter, and the small diameter of the tail of the two screws result in poor torque resistance. The small output torque and poor resistance to load are the most significant drawbacks of parallel twin-screw extruders. However, the plasticity of the aspect ratio is the advantage of the parallel twin screw. It can increase and decrease the aspect ratio to meet the requirements of the plastic processing technology according to the difference in molding conditions, and the applicable range of the parallel twin screw can be extended, but this is a point. Twin-screw extruders are difficult to achieve.

Conical twin screw extruder:
The two conical screws are horizontally arranged, and the two axes are loaded into the barrel at an included angle. The center distances of the two axes gradually increase from the small end to the large end, so that the two output shafts of the transmission gear box have larger center distances. The gears and gear shafts in the transmission system and the radial bearings and thrust bearings supporting these gear shafts have a large installation space. It can accommodate larger radial bearings and thrust bearings, and each transmission shaft is sufficient to meet the transmission torque. Because of the shaft diameter, large working torque and large load bearing capacity are a major feature of the conical twin-screw extruder.

1. The parallel twin-screw extruder is limited by the small center distance of the two screws. The bearing capacity of the anti-backup bearing is related to its diameter. The large bearing capacity of the diameter is large. Obviously, it is impossible to use a large-diameter, non-return bearing. This contradiction is usually achieved by connecting several small-diameter, non-returning bearings in series and cooperating with strong axial forces. The core problem with this method is that each thrust bearing must bear the same load. The bearing was destroyed prematurely due to overload and the load it was subjected to was overloaded on other bearings. The consequences of this continuous destruction were very serious. It can be seen that the structure of the drive system of the parallel twin-screw extruder is relatively complex. Compared with the conical twin-screw extruder drive system structure, the gear box has high manufacturing costs and complicated maintenance.

2. The conical twin-screw extruder has an included angle due to the arrangement of the two screws, so the two output shafts of the transmission gear box have a large center distance. Two thrust-adjusting thrust balls are arranged in the gear box. The bearing is enough to prevent the axial force formed by the head pressure, which has the characteristics of large bearing capacity, low manufacturing cost of the gear box and convenient maintenance.

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