Paint Product Dosing With Fixed-Time Injection Ratio Control
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Solution Overview
Problem
Current methods for dosing an injection product into a base product struggle to achieve precise control over the injection duration and amount, especially when the flow rate and quantity of the base product vary, leading to inaccuracies in the desired proportion between the two products.
Innovation Solution
A method involving continuous measurement and calculation of the base product amount based on the injected injection product, with controlled injection valves and channels, ensures precise dosing by injecting the injection product for a fixed time and recalculating the base product amount until the desired ratio is achieved, allowing for precise control without frequent adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the injection duration is adjusted as a function of the quantity of base product flowing and the flow rate of injection product, then the desired proportion between base product and injection product can be obtained, but the control of injection amount becomes difficult due to the short injection time compared to valve operation time
Solution Approach 1:
Instead of controlling the injection valve opening time to achieve precise dosing (which is difficult due to short durations), the patent inverts the approach: the injection valve opens for a fixed predetermined time, and the base product flow rate is adjusted to achieve the desired dosing ratio. This reversal makes the system easier to control while maintaining precision.
Solution Approach 2:
The patent changes the controlled parameter from injection valve opening time to base product flow rate. By keeping the injection product flow time fixed and adjusting the base product flow rate instead, the system achieves precise dosing control without the operational difficulties of controlling very short injection durations.
2Measurement precision
If the injection valve operation time is made much longer than the injection duration, then the valve can operate properly, but the theoretical fine adjustment of injection product duration cannot be implemented correctly
Solution Approach 1:
The patent reverses which parameter is fixed and which is adjusted. Instead of trying to precisely control the injection valve opening time (which has reliability issues when much shorter than valve operation time), the injection valve opens for a fixed reliable duration, and the base product flow rate is adjusted to achieve precise dosing control.
3Manufacturing precision
If frequent adjustments are made to maintain desired proportion, then dosing accuracy can be maintained, but the system complexity and operational difficulty increase
Solution Approach 1:
The patent performs preliminary action by pre-setting the injection valve opening time to a fixed predetermined value. This eliminates the need for frequent real-time adjustments during operation, simplifying the control system while maintaining dosing accuracy through flow rate measurement and calculation.
Data Source
AI summary
A method for dosing an injection product into a base product, in particular, for the production of a finishing and/or protective paint product, including the following steps: (a) supply of a mixing device, (b) establishment of a continuous flow of base product, (c) injection of the injection product into the continuous flow for a given time, (d) measurement of the amount of injection product injected, (e) calculation of a desired amount of base product based on the amount of injection product injected, steps (c), (d) and (e) being repeated when the amount of base product having passed since the start of step (c) is equal to the amount of base product desired, the injection product being injected into the base product only during step (c).