Thermocouple Positioning in Injection Molding Heating Devices
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Solution Overview
Problem
Existing heating devices used in injection molding dies face challenges in accurately positioning and easily replacing thermocouples, as they often require complex procedures due to differences in service lives between thermocouples and heating devices.
Innovation Solution
A heating device design with a thermocouple featuring a positioning section with a varying cross-sectional area and a locking mechanism to prevent displacement, allowing for simple and rapid replacement by enabling insertion from alternative directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the thermocouple is fixed in a crimped sleeve welded to the material tube, then accurate temperature monitoring is achieved, but the replacement of the thermocouple becomes complicated and time-consuming
Solution Approach 1:
The heating device is divided into separable components: the heating device can be removed from the material tube while the thermocouple remains fixed in the material tube. This allows the thermocouple to be replaced independently without replacing the entire heating device, significantly reducing replacement time and complexity.
Solution Approach 2:
The thermocouple is extracted from the heating device structure and directly fixed to the material tube. This separation allows the thermocouple to be accessed and replaced independently, eliminating the need to disassemble the heating device for thermocouple replacement.
2Stability of the object's composition
If the thermocouple passes through the heating device in a hole, then the thermocouple can be positioned, but the replacement procedure becomes complex due to the need to access through the heating device structure
Solution Approach 1:
The thermocouple is extracted from the heating device structure and directly fixed to the material tube. This eliminates the need for holes and access paths through the heating device, simplifying the replacement procedure while maintaining positioning stability through direct attachment to the material tube.
Solution Approach 2:
Instead of passing the thermocouple through the heating device, the approach is inverted: the thermocouple is attached directly to the material tube, and the heating device is then positioned around it. This reversal simplifies both positioning and replacement operations.
3Volume of moving object
If the thermocouple and heating device are integrated, then the assembly is compact, but the service life differences between components cannot be accommodated and replacement becomes difficult
Solution Approach 1:
The system is segmented into independently replaceable components: the heating device can be removed and replaced separately from the thermocouple, which remains fixed to the material tube. This allows each component to be replaced based on its specific service life, providing flexibility while maintaining a compact overall assembly.
Solution Approach 2:
The material tube with integrated thermocouple attachment serves as a universal base that can accommodate different heating devices over time. The thermocouple mounting structure on the material tube remains constant, allowing various heating devices to be replaced without affecting the thermocouple installation.
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
Ensures reliable thermocouple positioning and easy replacement, preventing unintended displacement while maintaining a compact design, thereby extending the service life and operational efficiency of heating devices.
Implementation Method 1
a heating device which has an inner jacket surface and an outer jacket surface with a heating element
Implementation Method 2
accurate temperature monitoring is important, which is achieved in practice by providing a thermocouple as a temperature sensor
Data Source
AI summary
A heating device (100, 200), which can be arranged at an object (101, 201) to be heated, especially an injection molding die, has an inner jacket surface (111, 211) and an outer jacket surface (112, 212), with a heating element (105, 205) and with a thermocouple (103, 203). The thermocouple (102, 203) has at least one positioning section, in which the cross section of the thermocouple (103, 203) deviates in at least one direction of the cross-sectional area from the cross section of at least one section of the thermocouple (103, 203) located adjacent to this positioning section. The heating device (100, 200) has at least one device for locking this positioning section against displacement in and/or opposite to the direction in which the thermocouple (103, 203) extends.