Valve Gate Assembly Cooling Plate for Injection Molding
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Solution Overview
Problem
High temperatures in hotrunner systems adversely affect the reliability and service life of electric motors used to control flow through the manifold channels, leading to increased complexity and costs in assembly and maintenance of injection molding apparatuses.
Innovation Solution
An electric motor and transmission assembly are mounted on a cooling plate attached to the heated manifold, allowing for easier assembly and maintenance, and utilizing a gear system to convert rotational motion into linear motion for precise control of the valve pin, with a cooling system to manage heat and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electric motors are mounted on the heated manifold to control flow through manifold channels, then precise control of resin flow is achieved, but high temperatures adversely affect reliability and service life of the electric motor
Solution Approach 1:
The system is divided into separate functional modules: the electric motor is mounted on a cooling plate away from the heated manifold, while the transmission mechanism (lead screw and nut) transfers motion to the valve pin. This segmentation allows the motor to operate in a cooler environment while still achieving precise control through the transmission system.
Solution Approach 2:
A cooling plate serves as an intermediary mounting surface between the heated manifold and the electric motor. The cooling plate with cooling channels provides a thermal barrier, allowing the motor to be positioned close to the manifold for control purposes while protecting it from excessive heat through the intermediate cooling structure.
2Reliability
If electric motors are supported remotely from the manifold, then motor reliability is improved, but assembly and maintenance complexity increases
Solution Approach 1:
The cooling plate is positioned asymmetrically on one side of the manifold, creating a dedicated mounting area for the motor and transmission components. This asymmetric arrangement consolidates multiple components onto a single accessible platform, simplifying assembly and maintenance while maintaining motor protection from heat.
Solution Approach 2:
The cooling plate serves multiple functions simultaneously: it acts as a mounting surface for the electric motor and transmission components, provides thermal protection through cooling channels, and serves as a structural support element. This multi-functionality reduces the number of separate components needed, simplifying the overall assembly.
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 arrangement enhances the reliability and efficiency of the electric motor, reduces maintenance time and costs, and allows for precise control of resin flow, improving production rates and reducing waste and surface defects.
Implementation Method 1
one or both of the electric motor and transmission are in thermal communication with the cooling plate
Implementation Method 2
The cooling plate includes cooling channels
Implementation Method 3
heated manifold and heated nozzles that maintain the resin in a liquid state
Implementation Method 4
a lead screw and nut or other transmission for converting a rotational output from the motor into linear motion of the valve pin
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
A valve gate assembly for an injection molding apparatus having hotrunners includes electric motor and transmission mounted on a cooling block that is itself mounted directly on the hotrunner manifold.