Inkjet Painting Head Washing With Gas-Liquid Two-Phase Flow
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Solution Overview
Problem
Inkjet-type vehicle painting machines have a low pressure-resistance value, making high-pressure washing methods ineffective for cleaning the painting head.
Innovation Solution
A vehicle painting machine with a bypass flow path and a washing control unit that uses a gas-liquid mixed state to wash the painting head, where air and washing liquid form two layers, allowing effective cleaning without high-pressure compressed air or microbubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-pressure washing methods are used to wash the painting head, then washing performance is improved, but the painting head cannot withstand the high pressure due to its low pressure-resistance value
Solution Approach 1:
The invention changes the physical state and pressure parameters of the washing liquid by mixing it with air to create a gas-liquid mixed state. This reduces the pressure required for effective washing while maintaining cleaning performance, allowing the painting head to be washed without damage from excessive pressure
Solution Approach 2:
The invention uses a composite gas-liquid mixed washing liquid instead of pure liquid washing solution. By combining air (gas) with washing liquid, it creates a two-phase flow that provides effective washing action while reducing the hydrostatic pressure burden on the painting head structure
2Manufacturing precision
If air is mixed with washing liquid to form gas-liquid mixed state, then washing performance under low pressure is improved, but the system complexity increases due to additional control requirements
Solution Approach 1:
The washing liquid supply unit is designed to perform multiple functions: it can supply pure washing liquid, supply air, and supply gas-liquid mixed state. This multi-functionality is achieved through a single integrated unit with selectable operating modes, reducing the need for separate systems for each washing mode
Solution Approach 2:
The switching unit acts as an intermediary component that controls the flow paths between the washing liquid supply, air supply, and painting head. It manages the complex sequencing of operations without requiring complex control logic in the supply units themselves, centralizing the control function in a dedicated component
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 thorough cleaning of the inkjet-type painting head ducts under low pressure, maintaining the integrity of the painting head while ensuring effective washing performance.
Implementation Method 1
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, and causing the washing liquid to flow to the head flow path by switching the switching unit to the state of supply to the head flow path in a state in which the air and the washing liquid have formed two layers along a flow direction
Data Source
AI summary
A vehicle painting machine includes a supply line for supplying a paint toward an inkjet-type painting head; a bypass flow path which causes the paint in the supply line to bypass the painting head; a switching unit for switching the paint from the supply line between head flow paths and the bypass flow path; a supply unit for selectively supplying a washing liquid and air to the supply line; and a washing control unit for controlling the switching unit and the supply unit to wash the painting head, and the washing control unit washes the painting head with the washing liquid in a gas-liquid mixed state by supplying the air in a state of supply to the bypass flow path wherein the supply line is filled with the washing liquid, and causing the washing liquid to flow by switching a first three-way valve to the head flow path side in a state in which the air and the washing liquid have formed two layers along a flow direction.