Two-Stage Injection Drive Apparatus for Molding Machines
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Solution Overview
Problem
Current servo injection molding machines face challenges in maintaining precise parallelism of linear guides and guide bars, leading to high energy consumption and reduced yield rates due to complex designs and heavy weight, necessitating a more efficient driving mechanism for injection molding machines.
Innovation Solution
A two-stage action injection drive apparatus comprising a material feeding mechanism, slide mechanism, and injection mechanism, where a material feeding screw feeds liquid plastic into a mold smoothly, and a reaction force is used to buffer and then push the screw forward for injection, reducing motor load and increasing yield rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a motor is used to drive two ball screws for moving a pressure plate and screw shaft, then injection molding can be performed, but the linear guides and guide bars are difficult to maintain parallel, increasing device complexity and reducing precision
Solution Approach 1:
The injection drive apparatus is divided into two independent drive systems: a material feeding drive mechanism with a material feeding screw and conveyor belt, and an injection drive mechanism with an injection screw and conveyor belt. This segmentation eliminates the need for multiple ball screws and linear guides, simplifying the overall structure while maintaining precision.
Solution Approach 2:
The patent replaces the complex ball screw and linear guide mechanical system with a simpler conveyor belt-driven system. The conveyor belts transmit motion directly to the screws, eliminating the need for precision-maintained parallel guides and bars, thus reducing device complexity while preserving manufacturing precision.
2Stability of the object's composition
If heavier weight components are used for the driving mechanism, then structural stability is improved, but energy consumption increases
Solution Approach 1:
The injection drive apparatus uses two-stage action with independent drive mechanisms that can dynamically adjust their operation. The material feeding stage operates at lower force requirements, and the injection stage delivers high force only when needed. This dynamic operation reduces average energy consumption while maintaining structural stability through optimized component design rather than excessive weight.
3Productivity
If single-stage injection drive is used, then device complexity is reduced, but motor load increases and yield rate decreases
Solution Approach 1:
The injection molding process is segmented into two distinct stages with independent drive mechanisms: material feeding (suction) stage and injection stage. Each stage has its own motor and conveyor belt system optimized for specific force and speed requirements. This segmentation allows precise control of each stage, improving product yield rate while maintaining reasonable device complexity through functional specialization.
Solution Approach 2:
The two-stage drive mechanism enables independent parameter optimization for each injection stage. The material feeding stage uses lower force and speed parameters, while the injection stage uses higher force parameters. This parameter differentiation reduces overall motor load requirements compared to single-stage systems while improving productivity through optimized process parameters for each stage.
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 apparatus effectively reduces motor load and increases yield rates by smoothly feeding and then squeezing plastic material in two stages, enhancing the efficiency and precision of the injection molding process.
Implementation Method 1
a conveyor belt is arranged between a drive shaft of the material-feeding motor and a disc
Implementation Method 2
a material feeding screw is inserted through the material feeding hole
Implementation Method 3
a reaction force is created to push the material feeding screw when the material feeding hole is almost fully filled with the liquid plastic material
Implementation Method 4
the injection mechanism is driven to move the drive screw so as to drive the slide mechanism pushing the material feeding screw to move forward and squeeze the plastic material
Data Source
AI summary
An injection drive apparatus for injection molding machines is revealed. Liquid material is fed into a mold smoothly by a material feeding screw of a material feeding mechanism. Then a reaction force is generated to push the material feeding screw when the material feeding hole is nearly full of the material. Thus the material feeding screw and the slide mechanism assembled therewith are pushed to move backward. Later the injection mechanism is driven by the slide mechanism to move and act on the drive screw. Thus the slide mechanism threaded with the drive screw is driven to push the material feeding screw moving forward and squeezing the material for injection molding. Therefore, the load of the motor is reduced dramatically and the yield rate of the products produced by injection molding is increased due to the two-stage action-feeding of the material and squeezing of the material for injection.