Piggable Coating Supply Line for Pressure Stability
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Solution Overview
Problem
The existing coating systems face challenges in conveying liquid materials through long, narrow lines due to pressure losses and irregular intrinsic pressure fluctuations in material sources, affecting reproducibility and efficiency in coating processes, particularly in the automotive industry.
Innovation Solution
The introduction of a piggable secondary supply line connected to a multi-way valve unit allows for a larger volume of material to be conveyed, enabling a specified and reproducible delivery pressure, which compensates for pressure losses and fluctuations by using a secondary pig as the conveying element, and allows for independent cleaning of the secondary supply line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If material is conveyed through long, narrow lines using intrinsic pressure from material sources, then the system structure remains simple, but pressure losses and fluctuations occur that affect delivery reproducibility
Solution Approach 1:
A pig is introduced as an intermediary conveying element that moves through the supply line to push material from the material source to the application device. The pig acts as a mechanical mediator that overcomes the insufficient intrinsic pressure of the material source, enabling reliable material conveyance through long, narrow lines while maintaining system simplicity.
Solution Approach 2:
The system utilizes pressure differentials and fluid dynamics principles where the pig is propelled by pressure from the material source and subsequently pushes material through the supply line. The conveying mechanism relies on pneumatic/hydraulic pressure generation and transmission to achieve reliable material delivery.
2Volume of moving object
If the supply line diameter is kept small to save space, then the system remains compact, but pressure losses increase making material conveyance difficult
Solution Approach 1:
The pig serves as a mechanical intermediary that directly pushes material through the narrow supply line, bypassing the pressure loss limitations that would affect pump-based systems. This allows the use of small-diameter lines while maintaining sufficient conveying pressure.
Solution Approach 2:
The pig is propelled automatically by pressure from the material source itself, then uses its own position and the pressure differential to push material through the line. The system uses the available pressure to move both the pig and the material, eliminating the need for additional pressing devices.
3Manufacturing precision
If material sources operate with irregular intrinsic pressure, then the system remains simple without pressure regulation, but delivery reproducibility deteriorates
Solution Approach 1:
The pig acts as a mechanical intermediary that decouples the irregular pressure from the material source from the material delivery process. Once the pig is propelled, it pushes material at relatively consistent pressure regardless of fluctuations in the material source pressure, achieving reproducible delivery without complex regulation.
Solution Approach 2:
The pig is propelled in advance by the material source pressure before actual material conveyance begins. This preliminary action stores mechanical energy in the pig's position and motion, which then drives consistent material delivery independent of subsequent pressure fluctuations in the material source.
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 configuration enhances the uniformity and reproducibility of material delivery to the application device, effectively addressing pressure loss and fluctuation issues, ensuring consistent coating quality.
Implementation Method 1
a sliding body, a so-called pig, pushes a volume of material in front of it. The pig is acted upon on the side remote from the delivery volume with a pressure fluid
Implementation Method 2
the dispensed coating material is ionized and transported to the object due to electrostatic forces
Implementation Method 3
the dispensed coating material is ionized and transported to the object
Data Source
Figure 1
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AI summary
The invention relates to a coating system for coating objects, comprising an application device (12) and a supply system (26), by means of which the application device (12) can be supplied with a liquid material. The supply system comprises at least one base supply device (46.1) with a piggable supply line (60.1) which extends between a first pigging station (58.1) and a second pigging station (64.1) and can be connected to one of multiple material sources (52) by means of a supply unit (48.1). The piggable supply line (60.1) is a piggable primary supply line (68.1) which can be connected to a discharge line (54.1) of the supply unit (48.1) by means of a valve unit (56.1). A piggable secondary supply line (72.1) is provided which is connected to the valve unit (56.1) and is connected to a secondary pigging station (64.1; 80.1) at the end remote from the valve unit (56.1). The valve unit (56.1) is designed as a multi-way valve such that the discharge line (54.1) of the supply unit (48.1) can be at least selectively connected to the primary supply line (68.1); or the discharge line (54.1) of the supply unit (48.1) can be at least selectively connected to the primary supply line (68.1) and the secondary supply line (72.1); or the primary supply line (68.1) can be at least selectively connected to the secondary supply line (72.1).