Pivoting Infrared Preheating for Plastic Welding Undercuts
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Solution Overview
Problem
Conventional plastic welding devices with preheating arrangements struggle to heat and weld components with complex projections or undercuts, as the preheating arrangement's vertical movement can damage the components or the preheating system, and fast mobility is required for effective preheating, which is not easily integratable and may result in suboptimal welds.
Innovation Solution
A plastic preheating arrangement featuring a support with a pivoting mechanism that allows the preheating device to pivot relative to the support, enabling it to circumnavigate undercuts and heat components effectively, using infrared preheating devices and a lever mechanism for mechanical actuation, allowing for both friction and infrared welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the preheating arrangement is moved vertically after the aligning position is reached, then the preheating arrangement can be positioned between the two components, but damage to or destruction of the projections or undercuts of the component and/or of the preheating arrangement occurs
Solution Approach 1:
The preheating arrangement is made dynamically movable not only vertically but also horizontally along a control line, allowing it to adapt its position dynamically to accommodate complex component geometries without causing damage
Solution Approach 2:
A guide structure or control line acts as an intermediary that constrains and directs the movement of the preheating arrangement, enabling safe navigation around complex projections and undercuts
2Productivity
If a conventional preheating arrangement is integrated on the lifting table, then the preheating arrangement can be moved vertically, but fast mobility required for effective preheating is not achieved and plastic hardens again during welding
Solution Approach 1:
The preheating arrangement is designed with enhanced mobility along the control line, enabling faster positioning and movement during the preheating process to maintain plastic in a softened state throughout welding
Solution Approach 2:
The preheating arrangement performs preliminary heating action quickly and efficiently before welding begins, ensuring the plastic remains in the desired softened state during the subsequent welding operation
3Device complexity
If the preheating arrangement is moved vertically only, then the structure is simple, but components with complex projections or undercuts cannot be heated effectively
Solution Approach 1:
The preheating arrangement transitions from simple vertical movement to dynamic multi-directional movement along a control line, enabling it to access and heat complex component geometries effectively
Solution Approach 2:
The movement capability is extended from one dimension (vertical) to two dimensions (vertical plus horizontal along control line), providing the additional degree of freedom needed to navigate complex projections and undercuts
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
Enables the simple and cost-effective heating of components with complex undercuts, resulting in a desired cosmetic weld seam and reduced fluff formation, while avoiding damage to the components or preheating arrangement.
Implementation Method 1
at least one first preheating device (40) and a pivoting arrangement (20) with which the at least one first preheating device (40) can be pivoted
Data Source
AI summary
The plastic preheating arrangement for a plastic welding device comprises a support, at least one first preheating device and a pivoting arrangement with which the at least one first preheating device can be pivoted relative to a first surface of the support from a starting position into a preheating position. In this manner, an undercut of a first component can be circumnavigated and the first component can be heated by means of the first preheating device.