Plasticizing Device Screw Shaft Thrust Load Management
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Solution Overview
Problem
In plasticizing devices with flat screws, the displacement of the screw shaft due to thrust loads from increased internal pressure between the flat screw and the barrel reduces the clearance and plasticizing capacity, leading to inefficient material processing.
Innovation Solution
A plasticizing device is designed with a bearing part that supports the screw shaft and includes angular ball bearings to absorb thrust loads, maintaining a predetermined gap between the flat screw and the barrel, and a coupling mechanism to prevent thrust load transmission to the speed reducer, ensuring consistent plasticizing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the clearance between the flat screw and the barrel is increased to improve plasticizing capacity, then the plasticizing capacity is improved, but the screw shaft displacement under thrust load increases causing the clearance to become unstable
Solution Approach 1:
A bearing part is introduced as an intermediary component between the screw shaft and the thrust load. The bearing part rotatably supports the screw shaft and receives the thrust load, preventing the screw shaft from displacing under pressure. This allows the clearance between the flat screw and barrel to be maintained at an optimal value for plasticizing capacity while ensuring stability under operational loads.
2Productivity
If the internal pressure between the flat screw and the barrel is increased to improve plasticizing, then the plasticizing efficiency is improved, but the thrust load on the screw shaft increases causing displacement
Solution Approach 1:
The thrust load is extracted from the screw shaft by introducing a bearing part that specifically receives and supports this load. The bearing part is configured to rotatably support the screw shaft while bearing the thrust load generated by increased internal pressure, allowing the screw shaft to maintain its position without displacement even under high plasticizing pressures.
3Reliability
If a rigid coupling between the screw shaft and drive mechanism is used to prevent displacement, then the positional stability is improved, but the thrust load is transmitted to the speed reducer causing potential damage
Solution Approach 1:
The bearing part serves as a mediator that decouples the thrust load from the drive mechanism. It provides rotational support to the screw shaft while independently bearing the thrust load, preventing transmission of this load to the speed reducer. This allows the system to maintain positional stability without subjecting the speed reducer to harmful thrust forces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents screw shaft displacement and maintains a stable gap between the flat screw and the barrel, ensuring constant plasticizing capacity and high rigidity, while protecting the speed reducer from thrust loads.
Implementation Method 1
a bearing part configured to rotatably support the screw shaft and receive a thrust load applied to the screw shaft from the flat screw
Implementation Method 2
a heating unit configured to heat a material supplied to between the flat screw and the barrel
Data Source
AI summary
A plasticizing device includes: a drive motor; a screw shaft rotated by the drive motor; a flat screw having a coupling surface coupled to the screw shaft and a groove forming surface in which a groove is formed, and configured to rotate around the screw shaft; a barrel having a facing surface facing the groove forming surface, and formed with a communication hole; a heating unit configured to heat a material supplied to between the flat screw and the barrel; and a bearing part configured to rotatably support the screw shaft and receive a thrust load applied to the screw shaft from the flat screw. The groove forming surface and the facing surface are separated from each other at a predetermined interval.