Cavity Preservation Spray Tool for Vehicle Bodies
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Solution Overview
Problem
Current methods for preserving vehicle body cavities, such as flood waxing, result in excessive wax coating, energy-intensive heating, and high operational costs due to the need for continuous heating and expensive equipment, leading to inefficient and unprofitable processes, especially for paint shops with higher daily capacities.
Innovation Solution
A method using a spray tool with a nozzle and spray head to atomize a mixture of preservative wax at high pressure and air at lower pressure, allowing for precise control of coating thickness and temperature, eliminating the need for excessive wax and heating, and enabling manual or robotic application in series production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flood waxing is used to preserve vehicle body cavities, then the cavities are coated with preservative wax, but an excessively thick coating (at least 1000 μm) is applied resulting in waste of material and contamination of mounting surfaces
Solution Approach 1:
The patent uses a pressure spray system to apply preservative wax in a controlled manner. Compressed air (0.5-5 bar) is supplied to the nozzle to atomize and distribute the wax evenly on cavity inner walls, preventing excessive accumulation and overflow that contaminates mounting surfaces.
Solution Approach 2:
The patent changes the application method from flooding to controlled spraying, adjusting parameters such as wax pressure (40-150 bar), air pressure (0.5-5 bar), and nozzle positioning to achieve optimal coating thickness of 30-200 μm, significantly reducing wax consumption compared to the 1000 μm+ thickness from flood waxing.
2Ease of repair
If the cavity flooding system is heated to 115–120°C to recycle excess wax, then the wax can be reused, but significant energy consumption occurs
Solution Approach 1:
The patent extracts the heating step from the wax application process. By using controlled pressure spraying, excess wax overflow is eliminated, making the energy-intensive heating and recycling step unnecessary. The system achieves sufficient coating without flooding, so no wax needs to be recovered through heating.
Solution Approach 2:
The spray system naturally controls wax distribution through pressure regulation and atomization, preventing the formation of excess wax that would require external heating and recycling systems. The process is self-regulating through proper parameter control.
3Reliability
If a high quantity of preservative wax is applied to achieve specified coating thickness, then the cavity protection is ensured, but the mounting surfaces of chassis components are contaminated with permanent wax residue
Solution Approach 1:
The patent uses compressed air (0.5-5 bar) supplied to the spray nozzle to atomize the wax and control its distribution. This pneumatic assistance ensures wax is deposited only where needed on cavity inner walls, preventing overflow onto mounting surfaces of chassis components.
Solution Approach 2:
The spray system applies wax locally and uniformly on the cavity inner walls through controlled atomization. The mounting surfaces of chassis components remain free of wax contamination, allowing for stable tightening torques and proper assembly.
4Reliability
If the flooding system is used for cavity preservation, then the process can be implemented, but the investment cost and operational expenses are very high making it unprofitable for paint shops
Solution Approach 1:
The patent employs a relatively simple pressure spray system with nozzle(s) connected to a wax supply line and compressed air source. This eliminates the need for complex flooding systems with multiple spray bars, heating zones, and wax recovery infrastructure, significantly reducing both initial investment and operational costs.
Solution Approach 2:
The spray nozzle system is simpler and less expensive than flooding equipment. The method consumes less wax (30-200 μm vs. 1000+ μm), reducing material costs. The overall system is more economical for high-volume production environments.
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
This approach reduces energy consumption, eliminates wax residue on mounting surfaces, and lowers operational costs by achieving precise coating control, ensuring reliable and economical cavity preservation with minimal environmental impact.
Implementation Method 1
The preservative wax is applied in a spray process with a nozzle and spray head, in which the inner walls of the body cavities are coated by atomizing a mixture of the preservative wax, at a pressure in the three-digit bar range, and air, at a pressure in the single-digit bar range
Implementation Method 2
The preservative wax is applied in a spray process with a nozzle and spray head, in which the inner walls of the body cavities are coated by atomizing a mixture of the preservative wax, at a pressure in the three-digit bar range
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a method for preserving cavities, in particular of vehicle bodies, wherein the preservative wax is applied to the inner walls of the body cavities by means of the spraying tool (1) having a nozzle (2) and spraying head (4), characterised in that the inner walls of the body cavities can be coated via the atomisation of the mixture made of the preservative wax at a pressure in the three-digit bar region, and the air at a pressure in the one-digit bar region, wherein the coating cycle is carried out by means of the atomisation (200) of the preservative wax in sequences. The method for preserving cavities can be carried out both manually and robotically.