Single-Side Electrode Heating With Four-Bar Line Contact
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Solution Overview
Problem
Conventional single side heating apparatuses face challenges in achieving accurate line contact between electrodes and workpieces due to improper center of rotation, leading to heating failures and point contact instead of line contact.
Innovation Solution
A single side heating apparatus equipped with a four-bar linkage mechanism that tilts the electrode holder around an axis orthogonal to the contact direction, ensuring the center of rotation is proximate to the contact portion, allowing for proper linear contact without sticking issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the center of rotation of the electrode is spaced apart upward from the electrode, then the electrode can be supported by a simple mechanism, but the line contact portion swings or rotatively displaces to a large extent in the extension direction, causing one end to get stuck on the workpiece and resulting in point contact instead of line contact
Solution Approach 1:
The patent changes the dimension of the rotation center position from being spaced apart upward (vertical dimension) to being located at the contact portion level (horizontal alignment with contact surface). This dimensional repositioning ensures that the electrode rotates around a point that maintains line contact with the workpiece surface, preventing the contact portion from lifting off or getting stuck during rotation.
Solution Approach 2:
The patent changes the critical parameter of rotation center position from a vertically spaced location to a location at the same level as the contact portion. This parameter change fundamentally alters the rotation behavior, ensuring that the electrode maintains continuous line contact with the workpiece throughout its rotational movement, thereby achieving precise heating contact.
2Ease of operation
If motor control is used to control the position of the electrodes, then the position can be adjusted, but it is difficult to make the line contact portion of the electrode line contact with the workpiece in an accurate manner
Solution Approach 1:
The patent employs a self-adjusting mechanism where the electrode automatically orients itself to maintain line contact with the workpiece through passive rotation around a properly positioned center of rotation. The reaction force from the workpiece itself drives the electrode into the correct contact orientation, eliminating the need for complex motor control systems while ensuring accurate line contact.
Solution Approach 2:
The patent replaces the motor control system (active mechanical control) with a passive mechanical mechanism based on proper center of rotation positioning. Instead of using motors to actively control electrode position and orientation, the system uses the geometric arrangement of the rotation center to passively ensure line contact, simplifying the control system while improving contact accuracy.
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 four-bar linkage mechanism enables the contact portion to maintain linear contact with the workpiece, preventing sticking and ensuring effective heating by allowing displacement only in the upper-lower direction, thus improving heating efficiency.
Implementation Method 1
a four-bar linkage provided between the base portion and the electrode holder and configured to rotate to tilt the electrode holder around an axis orthogonal to the one direction by a reaction force received by the electrodes from the workpiece
Implementation Method 2
the one end of the contact portion displaces in the upper-lower direction only, that is substantially the same as the pressing direction. This makes it possible to make the contact portion properly contact with the workpiece without the one end of the contact portion getting stuck on the surface of the workpiece
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3C
AI summary
A single side heating apparatus, which can make contact portions of electrodes properly contact with a workpiece, is provided. A single side heating apparatus (1) equipped with a pair of electrodes (2A, 2B) for heating a workpiece from one side of the workpiece includes: a base portion (3); the pair of electrodes (2A, 2B) each having a contact portion (4) configured to contact with the workpiece in one direction continuously or at a plurality of spaced-apart portions thereof; an electrode holder (5), to which the pair of electrodes (2A, 2B) are fixed; and a four-bar linkage (7) provided between the base portion (3) and the electrode holder (5) and configured to rotate to tilt the electrode holder (5) around an axis (O1) orthogonal to a direction in which the contact portions (4) extend, by a reaction force received by the electrodes (2A, 2B) from the workpiece, wherein the four-bar linkage (7) includes a first link located closer to the electrode holder (5), a second link located closer to the base portion (3), a third link, and a fourth link, the first link being shorter than the second link, and the third link and the fourth link being equal in length.