Electric Injection Moulding Drive Spindle Segmentation
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Solution Overview
Problem
Existing electric injection molding devices for plastic injection molding presses face challenges in achieving efficient drive movements on the drive spindle and plasticizing screw with minimal effort, limiting the ability to generate various rotational speeds and drive torques.
Innovation Solution
The design incorporates a drive spindle with axially adjacent threaded sections of opposite thread courses, coupled with electric motors for the spindle nut and a secondary spindle, allowing for adjustable rotational speeds and torques through a geared coupling mechanism, enabling both translational and rotational movements of the plasticizing screw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single threaded section is used on the drive spindle, then the structure is simple, but the ability to generate different rotational speeds and drive torques is limited
Solution Approach 1:
The drive spindle is divided into multiple axially adjacent threaded sections (first threaded section and second threaded section) with opposite thread courses. Each threaded section can engage with a separate spindle nut, allowing independent control of rotational speed and torque for each section, thereby achieving versatile drive capabilities while maintaining a relatively simple segmented structure.
2Adaptability or versatility
If multiple threaded sections with opposite thread courses are used on the drive spindle, then different rotational speeds and drive torques can be generated, but the device complexity increases
Solution Approach 1:
Multiple threaded sections are merged onto a single drive spindle, sharing common support structures such as the housing, bearings, and control system. This combining approach allows the system to achieve multiple drive functions (different speeds and torques) without proportionally increasing overall device complexity, as several components are shared across the multiple threaded sections.
3Productivity
If high speeds and large forces are achieved through the geared coupling mechanism, then the injection molding performance is enhanced, but the energy consumption increases
Solution Approach 1:
The drive system employs dynamic control where the first and second drive motors can independently adjust their operating parameters (speed and torque) based on the specific injection molding requirements. The geared coupling mechanism provides dynamic speed multiplication or reduction, allowing the system to achieve high speeds when needed while consuming less energy during operations requiring moderate speeds, thereby optimizing the balance between productivity and energy consumption.
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
This configuration allows for efficient, cost-effective, and energy-saving drive movements, enabling high speeds and large forces with flexible movement selection, while maintaining control over drive motor speed and torque, thus enhancing the overall performance of the injection molding process.
Implementation Method 1
The drive spindle (14) has two axially adjacent threaded sections (18, 21) with opposite thread courses. A first spindle nut (20) is in engagement with the first threaded section (18), and a second spindle nut (23) is in engagement with the second threaded section (21).
Implementation Method 2
A first drive motor (30), in particular an electric motor, is assigned to the first spindle nut (20) to drive it. A second drive motor (31), in particular an electric motor, is assigned to the hollow spindle (35) to drive it.
Data Source
AI summary
The device has a drive spindle (14) driving a plasticizing screw in such a manner that the spindle performs translatory feed motion during injection of plastic material in a form cavity, rotating motion around own axis, translatory rotating motion around own axis and rear movement during plasticizing phase of plastic material. A spindle (19) is driven by a drive motor (31) combined with the drive spindle. The drive spindle and the spindle are coupled to each other such that the translatory and rotary movements are transferred to the plasticizing screw in both directions.