Rotating Spray Gun for Uniform Coating on Special-Shaped Containers
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Solution Overview
Problem
The existing coating devices struggle to achieve uniform coating film thickness on container inner walls with special shapes, such as mayonnaise bottles, leading to reduced slidability due to uneven coating agent distribution.
Innovation Solution
A coating method and device that adjust the relative positional relationship and rotational speed of the spray gun to the container along its longitudinal direction, allowing for variable rotation speeds and angles based on the container's shape to ensure uniform coating, and incorporating a suction unit to prevent atomized agent from adhering to unwanted areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a commonly used spray gun is used to coat the container inner wall surface, then the coating process is simple, but the coating film thickness becomes uneven on containers with special shapes
Solution Approach 1:
The spray gun is made rotatable about its longitudinal axis, transforming a static coating process into a dynamic one. This rotation allows the spray gun to adapt to different container shapes and sizes, achieving uniform coating film thickness on containers with special shapes while maintaining process simplicity
Solution Approach 2:
The rotation speed of the spray gun is varied according to the container shape and size. By changing this parameter dynamically, the system achieves uniform coating on different container types without requiring multiple specialized spray guns, resolving the contradiction between simplicity and precision
2Device complexity
If the spray gun rotates at a constant speed, then the device structure is simple, but the coating film thickness becomes uneven on containers with non-uniform geometry
Solution Approach 1:
The rotation speed of the spray gun is made variable rather than constant. The rotation speed is adjusted according to the container shape and the position of the spray nozzle relative to the container wall, enabling uniform coating on containers with non-uniform geometry while keeping the device structure relatively simple
Solution Approach 2:
The rotation speed is controlled based on feedback information about the container shape and spray nozzle position. This feedback mechanism ensures that the rotation speed is optimized for each specific coating situation, achieving uniform coating film thickness without requiring complex additional hardware
3Area of stationary object
If the spray gun is inserted deep into the container, then the entire inner wall surface can be coated, but the distance from the spray nozzle to the container inner wall surface becomes non-uniform
Solution Approach 1:
The spray gun is rotated about its longitudinal axis while being inserted into the container. This dynamic rotation ensures that even when the spray gun is inserted deep into the container, the distance from the spray nozzle to various points on the container inner wall surface remains effectively uniform, achieving complete coverage without thickness variations
Solution Approach 2:
The rotation of the spray gun creates a symmetric coating pattern that accounts for the radial distance variations. By rotating the spray gun, the system compensates for the non-uniform distance from the nozzle to different points on the container wall, achieving uniform coating film thickness across the entire inner surface
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 ensures a uniform coating film thickness on containers with complex shapes, preventing agent adherence to unwanted areas and allowing efficient coating in limited spaces without requiring additional container rotation mechanisms.
Implementation Method 1
ejecting the coating agent onto the container inner wall surface from the spray gun
Implementation Method 2
incorporating a suction unit to prevent atomized agent from adhering to unwanted areas
Data Source
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AI summary
Provided are a coating method and a coating device capable of making the coating film thickness of a coating agent uniform with a simple structure even in the case where a container having a special shape is a coating target. Provided is a coating method for coating the inner wall surface of a container (C) with a coating agent (L), the coating method including moving a spray gun (20) that ejects the coating agent (L) and the container (C) relative to each other along a gun longitudinal direction to insert the spray gun (20) into the container (C), and ejecting the coating agent onto the container inner wall surface from the spray gun while adjusting a relative positional relationship between the spray gun (20) and the container (C) in the gun longitudinal direction, rotating the spray gun (20) and the container (C) relative to each other about an axis along the gun longitudinal direction, and changing at least one of a relative rotation speed between the spray gun (20) and the container (C) and an angle range of the rotation in accordance with the shape of the container (C).