3D Printer Chamber Locking Mechanism with Segmented Pins
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Solution Overview
Problem
Three-dimensional printing systems face safety issues due to potential breaches of the process chamber during operation, which can be hazardous, especially when using inert gases and high-powered energy beams, necessitating a reliable and secure mechanism for chamber closure.
Innovation Solution
A three-dimensional printing system featuring a housing with a door and perimeter seal, utilizing a door locking system with pins and a lock actuator that translates a locking plate between unlocked and locked positions, ensuring secure closure and evacuation/backfilling with inert gas, enhancing safety and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple door closure mechanism is used, then the device complexity is reduced, but the reliability of chamber closure is compromised
Solution Approach 1:
The locking system is segmented into multiple independent pins (at least two pins) that can be individually engaged with the door. Each pin operates independently to provide redundant locking, ensuring that if one pin fails, others maintain chamber closure reliability. This segmentation allows the system to achieve high reliability without requiring an overly complex monolithic locking mechanism.
Solution Approach 2:
The locking plates are positioned and configured in advance to receive the pins in specific engagement positions. The housing structure includes pre-positioned locking plates with receptacles that guide pin engagement before final locking occurs. This preliminary arrangement ensures that when the door closes, the pins automatically engage with the locking plates in the correct sequence and position, enhancing reliability without adding complex control mechanisms.
2Reliability
If multiple locking pins are used to enhance safety, then the reliability improves, but the device complexity increases
Solution Approach 1:
The locking plates serve multiple functions: they guide the pins during door closure, provide engagement surfaces for the pins, and can be actuated to control pin engagement. The same locking plate structure handles both positioning and securing of multiple pins, reducing the need for separate components for each function and thereby limiting the increase in device complexity despite using multiple pins.
Solution Approach 2:
The locking system merges the functions of multiple pins and locking plates into a integrated assembly where the pins and locking plates work together as a coordinated unit. The pins are coupled to the door while the locking plates are coupled to the housing, creating a unified locking mechanism that achieves high reliability through multiple engagement points without requiring separate complex systems for each pin.
3Reliability
If a robust locking mechanism with multiple pins and locking plates is implemented, then the safety and reliability are enhanced, but the ease of operation decreases
Solution Approach 1:
The locking system is designed to be self-actuating through the door closure motion itself. When the door is closed, the pins automatically engage with the locking plates in the engagement positions without requiring separate manual locking actions. The mechanical geometry of the pins and locking plates ensures that proper engagement occurs automatically as the door reaches the closed position, maintaining ease of operation while ensuring reliable locking.
Solution Approach 2:
The locking mechanism incorporates dynamic engagement where the pins and locking plates interact during the door closure motion. The pins can move slightly during engagement to accommodate tolerances, and the locking plates are positioned to receive pins progressively as the door closes. This dynamic interaction simplifies operation by allowing the system to self-adjust during closure while maintaining secure locking at the end position.
Data Source
Figure 1A~1B
Figure 2~3
Figure 4
AI summary
A three-dimensional printing system for manufacturing a three-dimensional article includes a housing, a door, and a door locking system. The housing encloses a process chamber and has a vertical front surface with an opening providing access to the process chamber. The door is coupled to the front surface to be moved between an open position and a closed position. The door locking system includes a plurality of pins, a locking plate, and a lock actuator. The plurality of pins extend along a direction that is perpendicular to the vertical front surface when the door is in the closed position. The locking plate defines a plurality of holes positioned to receive the plurality of pins when the door is rotated into the closed position. The lock actuator is coupled to the locking plate and configured to translate the locking plate between an unlocked position and a locked position.