Removable PCB Transport Rollers for Vacuum Reflow Maintenance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Reflow soldering systems face downtime and reduced productivity due to the need for regular maintenance, cleaning, and replacement of drive parts exposed to high temperatures and mechanical loads within pressure chambers, especially in vacuum environments where contamination and wear are significant.
Innovation Solution
A transport unit with a base part and drive parts that can be easily exchanged, featuring a rotary drive system with gears and adjustable receiving parts, allowing for direct engagement and disengagement of drive wheels and rollers, reducing maintenance needs and enabling efficient handling of printed circuit boards through preheating, soldering, and cooling zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drive parts are permanently fixed in the pressure chamber, then reliability is improved, but maintenance and replacement become difficult
Solution Approach 1:
The drive unit is divided into a base part that remains in the pressure chamber and drive parts that can be removed. The drive wheels are mounted on the drive parts, which can be detached from the base part. This segmentation allows the drive parts to be easily removed for maintenance while keeping the overall system reliable during operation.
Solution Approach 2:
The system transitions from a static, permanently fixed drive part configuration to a dynamic system where drive parts can be easily attached and detached. The rotary drive mechanism enables the base part to engage and disengage drive parts as needed, providing operational flexibility for maintenance while maintaining reliability during soldering processes.
2Ease of repair
If drive parts are made removable for easy maintenance, then ease of repair is improved, but device complexity increases
Solution Approach 1:
The base part serves multiple functions: it provides structural support, houses the rotary drive mechanism, and interfaces with removable drive parts. This multi-functionality reduces the need for separate components for each function, thereby reducing overall device complexity while maintaining ease of maintenance through removable drive parts.
Solution Approach 2:
The rotary drive mechanism acts as an intermediary between the base part and the drive parts. It provides a standardized interface that simplifies the connection and disconnection process, making the system easier to maintain without significantly increasing complexity. The intermediary mechanism ensures reliable power transmission while allowing easy replacement of drive parts.
3Productivity
If traditional conveyor systems are used in vacuum chambers, then productivity is maintained, but contamination and wear increase
Solution Approach 1:
The patent replaces traditional belt-driven mechanical conveyor systems with a rotary drive system that uses direct gear engagement. This substitution eliminates the need for belts that can degrade and contaminate the vacuum environment, while reducing wear through more reliable mechanical engagement. The drive wheels directly engage with the circuit boards or carriers, providing contamination-free operation that maintains productivity.
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 transport unit ensures reliable and robust handling of printed circuit boards, reduces downtime by simplifying the exchange and maintenance of drive parts, and maintains high productivity even in high-stress environments like vacuum chambers, with minimal lubrication requirements and reduced sensitivity to contamination.
Implementation Method 1
drive rollers which are rotatably coupled to the respective drive wheels and which act on the printed circuit board to transport the printed circuit board through the zone
Data Source
AI summary
A transport unit for transporting printed circuit boards along a direction of transport within at least one zone of a soldering system, in particular a reflow soldering system, characterized in that a base part is provided with an output shaft that can be driven, and with at least two output wheels which are rotatably coupled to the output shaft, in that at least two drive parts which can be releasably fastened on and removed from the base part are each provided with a drive wheel in such a manner that the drive parts have drive rollers which are rotatably coupled to the drive wheel, and which act on the printed circuit board to transport the printed circuit board through the zone, and in that, when the drive parts are fastened to the base part, each of the output wheels is in engagement with the associated drive wheel.