Inkjet Painting Head Washing Using Bypass Gas-Liquid Flow
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Solution Overview
Problem
Inkjet-type vehicle painting machines have a low pressure-resistance value, limiting the use of high-pressure washing methods for the painting head.
Innovation Solution
A vehicle painting machine with a bypass flow path and a washing control unit that switches between supply lines to create a gas-liquid mixed state using air and washing liquid, allowing effective washing of the painting head without high pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-pressure washing methods are used to wash the painting head, then washing effectiveness is improved, but the painting head cannot withstand the high pressure due to low pressure-resistance value
Solution Approach 1:
The patent introduces air as an intermediary substance mixed with washing liquid to create a gas-liquid mixed state. This intermediary allows the washing process to achieve better penetration into ducts while reducing the pressure load on the painting head, as the gas phase provides cushioning and the liquid phase provides cleaning action.
Solution Approach 2:
The patent changes the physical state and composition parameters of the washing medium by mixing air with washing liquid. This creates a gas-liquid mixed state that has different flow characteristics and pressure transmission properties compared to pure liquid, enabling effective washing at lower pressures.
2Manufacturing precision
If high-pressure compressed air or microbubbles are used to enhance washing, then washing performance is improved, but the painting head structure cannot withstand the high pressure
Solution Approach 1:
The patent uses air as a mediator that is introduced into the washing liquid flow path. The air mixes with the washing liquid to form a gas-liquid mixed state that provides enhanced washing performance through bubble action and improved fluid dynamics, while the overall pressure remains within the painting head's承受能力.
Solution Approach 2:
The patent applies pneumatic-hydraulic principles by combining gas (air) and liquid (washing liquid) flows. The air supply unit introduces air into the washing liquid, creating a two-phase flow that leverages both pneumatic and hydraulic effects to achieve effective washing without requiring high pressure.
3Ease of manufacture
If the switching unit is switched to supply to the bypass flow path, then the supply line can be filled with washing liquid, but the painting head is not directly washed
Solution Approach 1:
The patent employs preliminary action by first switching the flow path to the bypass to fill the supply line with washing liquid and mix in air, then subsequently switching to the head flow path to deliver the prepared gas-liquid mixed washing medium to the painting head. This two-step preliminary preparation ensures optimal washing conditions.
Solution Approach 2:
The patent uses periodic switching of the flow path configuration. The switching unit alternates between directing flow to the bypass path (for preparation) and the head flow path (for actual washing), creating a periodic cycle that ensures proper filling and mixing before delivering the washing medium to the painting head.
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 better washing of the inkjet-type painting head ducts under low pressure, preventing damage and ensuring effective cleaning without high-pressure compressed air or microbubbles.
Implementation Method 1
washes the painting head with the washing liquid in a gas-liquid mixed state by supplying the air in a state in which the switching unit is switched to a state of supply to the bypass flow path wherein the supply line is filled with the washing liquid
Data Source
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AI summary
[Problem] To provide a vehicle painting machine which enables better washing of ducts inside an inkjet-type painting head, even under a low pressure. [Solution] A vehicle painting machine 10 comprises: a supply line 32 for supplying a paint toward an inkjet-type painting head 31; a bypass flow path 33 which causes the paint in the supply line 32 to bypass the painting head 31; a switching unit 35 for switching the paint from the supply line 32 between head flow paths 31a, 31b and the bypass flow path 33; a supply unit 36 for selectively supplying a washing liquid and air to the supply line 32; and a washing control unit 37 for controlling the switching unit 35 and the supply unit 36 to wash the painting head 31, and the washing control unit 37 washes the painting head 31 with the washing liquid in a gas-liquid mixed state by supplying the air in a state of supply to the bypass flow path 33 wherein the supply line 32 is filled with the washing liquid, and causing the washing liquid to flow by switching a first threeway valve 35 to the head flow path 31a, 31b side in a state in which the air and the washing liquid have formed two layers along a flow direction.