Integrated Nut Feed System for Resistance Welding Synchronization
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Solution Overview
Problem
Existing nut feed systems for press welders in resistance welding are inefficient and prone to mechanical malfunctioning, leading to slow production and errors, especially in high-speed industries like the automobile sector, due to decoupling of cylinder displacement from feeding operations and lack of effective synchronization with welding actions.
Innovation Solution
A direct nut feed system with a guide cylinder connected to the welding cylinder, featuring a guide piston with a movement stop and a cam-type mechanism for precise component positioning and automatic feeding, ensuring correct alignment and synchronization with the welding process, enhancing productivity and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a rod-shuttle feed system is used to supply nuts through a tube, then automatic feeding is achieved, but the system becomes mechanically complex and prone to malfunctioning due to decoupling of cylinder displacement from feeding operations
Solution Approach 1:
The patent merges the feeding function with the welding cylinder by integrating a feed mechanism directly into the welding cylinder assembly. The feed piston and welding piston share the same cylinder body, eliminating the need for separate rod-shuttle mechanisms and tubes. This integration ensures that feeding operations are mechanically coupled with cylinder displacement, preventing malfunctioning while maintaining automation.
Solution Approach 2:
The patent extracts the feeding mechanism from the complex rod-shuttle system and simplifies it by implementing a direct feed piston within the welding cylinder. This extraction removes unnecessary intermediate components such as tubes, shuttles, and centering pins, reducing mechanical complexity while preserving automatic feeding capability.
2Ease of operation
If the upper electrode remains moved backward during feeding to allow component loading, then feeding space is provided, but welding cycle time increases due to sequential operations
Solution Approach 1:
The patent implements dynamic positioning where the feed piston and upper electrode move and retract in a coordinated manner within the same cycle. The feed piston extends to push the component while the upper electrode retracts to provide loading space, then both return to their working positions simultaneously. This dynamic coordination eliminates idle time and allows overlapping of feeding and welding preparation operations.
Solution Approach 2:
The feed piston performs preliminary component positioning before the upper electrode completes its downward stroke for welding. The component is pushed into place and centered on the lower electrode in advance, so that when the upper electrode arrives, the component is already properly positioned, eliminating the need for sequential waiting periods.
3Device complexity
If manual or semi-automatic loading methods are used to place nuts on sheet metal, then system complexity is reduced, but production speed decreases significantly
Solution Approach 1:
The welding cylinder itself performs the feeding function through its integrated feed piston, making the system self-sufficient. The feed piston automatically pushes components from the tube onto the lower electrode using the same pneumatic or hydraulic power source that drives the welding operation. This self-service approach eliminates the need for separate automated feeding systems while maintaining high production speed.
Data Source
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Figure 1b
Figure 2a
AI summary
The present invention relates to a component feed system for a press welder (1) for resistance welding, wherein said press welder (1) is of the type comprising: a welding cylinder (2) connected to an upper electrode (3); and a lower electrode (4), equipped with a centering pin (5); wherein the upper electrode (3) and the lower electrode (4) are aligned along an axis on which the upper electrode (3) can move, moving closer to or away from the lower electrode (4), by means of the actuation of the welding cylinder (2). Said component feed system further comprises: a component feed tube (8) connectable to a piece of equipment for feeding said components; a component feed head (10) connected to the tube (8), wherein said head (10) is arranged on the axis defined by the electrodes (3, 4), at a height above the height of the lower electrode (4); wherein said head is equipped with housing clamps (11) for housing the components coming from the tube (8).