Coating Device Pressure and Flow Control for Automotive Paint
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Solution Overview
Problem
Current coating devices, particularly print heads, face challenges in maintaining a constant delivery volume of high-viscosity coating agents like paints due to factors such as viscosity variations, temperature changes, and shear effects, leading to unsatisfactory paint supply during series painting of motor vehicle body components.
Innovation Solution
The coating device adjusts the coating agent pressure and flow rate in a controlled manner using a metering pump or piston metering device, ensuring defined application conditions by incorporating a pressure sensor, flow measuring cell, and controller to regulate the coating agent supply, thereby ensuring high-quality coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional atomizers (rotary, air, airless, airmix) are used for coating, then coating application is achieved, but overspray is produced and application efficiency is limited
Solution Approach 1:
The invention extracts and eliminates the harmful spray mist generation mechanism from conventional atomizers. By using a print head that directly deposits liquid or gel coating agent without atomization, the harmful overspray is completely removed while maintaining coating application capability.
Solution Approach 2:
The invention replaces the mechanical atomization system (rotary atomizers, air atomizers, airless atomizers, airmix atomizers) with a print head system that uses controlled liquid or gel ejection. This substitution eliminates the spray mist formation and achieves near-100% application efficiency.
2Quantity of substance
If pressure conveying is used to supply coating agent to print head, then delivery volume can be increased, but flow rate becomes unstable due to clogged filters, hoses, or cross-sectional changes
Solution Approach 1:
The invention implements a feedback control system where a flow sensor continuously monitors the actual flow rate of coating agent and provides feedback to a control unit. The control unit adjusts the pump drive accordingly to maintain a predetermined target flow rate, compensating for disturbances such as clogged filters or hoses.
Solution Approach 2:
The invention changes the operating parameters of the pump system by controlling the pump drive based on feedback from the flow sensor. This dynamic parameter adjustment allows the system to maintain stable flow rate despite changes in system conditions such as viscosity variations or partial blockages.
3Manufacturing precision
If high viscosity coating agents are used to achieve quality coatings, then consistent application rate is required, but pressure conveying becomes more difficult and flow rate stability decreases
Solution Approach 1:
The feedback control system continuously monitors flow rate and adjusts pump drive to compensate for the difficulties of conveying high viscosity coating agents. This ensures consistent application rate and coating quality even when handling viscous materials that are prone to flow rate variations.
Solution Approach 2:
The invention uses a pump system specifically designed to handle high viscosity coating agents, with the pump drive being controllable to optimize performance. The feedback-controlled hydraulic or pneumatic pump system overcomes the conveying difficulties associated with high viscosity materials.
4Adaptability or versatility
If paint viscosity varies due to temperature and shear effects, then delivery volume is affected, but conventional pressure conveying cannot compensate for these variations
Solution Approach 1:
The feedback control system detects flow rate variations caused by viscosity changes due to temperature or shear effects and automatically adjusts the pump drive to maintain consistent delivery volume. This adaptability allows the system to compensate for environmental and operational variations.
Solution Approach 2:
The system dynamically changes the pump operating parameters in response to detected flow rate variations. By adjusting pump speed or pressure based on feedback, the system compensates for viscosity changes caused by temperature or shear effects, maintaining consistent delivery volume.
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 solution significantly enhances the application efficiency of coating agents, reducing overspray and ensuring that nearly all applied paint is deposited on the component, achieving application efficiencies of at least 80% and maintaining consistent flow rates for high-quality surface coatings.
Implementation Method 1
a coating agent supply (2, 16), wherein a specific coating agent pressure and a specific flow rate of the coating agent are set, wherein the coating agent supply adjusts the coating agent pressure and/or the flow rate of the coating agent in a controlled manner
Implementation Method 2
pressure sensor (13, 19)
Implementation Method 3
flow measuring cell (18)
Implementation Method 4
controller (20, 28) which controls the coating agent pump (9, 17, 25) depending on the measured coating agent pressure and/or depending on the measured flow rate of the coating agent
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
The invention relates to a coating device for coating components (e.g., automotive body components) with a coating agent (e.g., paint), comprising a printhead (10; 14; 22; 32) for applying the coating agent to the component, and a coating agent supply for supplying the printhead (10; 14; 22; 32) with the coating agent to be applied, wherein the coating agent flows from the coating agent supply to the printhead (10; 14; 22; 32) at a specific coating agent pressure (p) and a specific flow rate (Q). The invention provides that the coating agent supply includes a buffer reservoir (31) which receives the coating agent and buffers pressure fluctuations of the coating agent. Furthermore, the invention includes a corresponding operating method.