Threaded Piston Metering for Multi-Component Adhesives
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Solution Overview
Problem
Existing metering and mixing devices face challenges with metering accuracy, particularly at high quantitative ratios of components, such as 50:1 or higher, and require specialized cartridges with internal threads, limiting the use of simple tubular cartridges.
Innovation Solution
A metering and mixing device with discharging pistons featuring an outer thread that rotates to drive forward, allowing for precise metering by adjusting thread pitch and circumferential speed, and accommodating both cylindrical and tubular bag cartridges without the need for internal threads, using a combination of linear and rotational driving mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If threaded bars are plunged with full length into components to be mixed, then metering precision is improved, but cartridge structure complexity increases requiring special cartridges with internal threads
Solution Approach 1:
Instead of placing the thread on the discharging piston (as in conventional designs), the patent inverts the approach by placing the thread on the discharging piston's outer surface that engages with the cartridge's inner wall. This allows the piston to screw into the cartridge during rotation, providing precise metering control while maintaining compatibility with simple tubular cartridge structures without requiring complex pre-threaded cartridges.
Solution Approach 2:
The discharging piston with an outer thread performs the function of both pushing the component forward and simultaneously screwing into the cartridge through rotational motion. This self-service mechanism integrates metering and discharge functions in one component, achieving precise metering control without requiring separate threading mechanisms or complex cartridge structures.
2Manufacturing precision
If specialized cartridges with internal threads are used, then metering accuracy at high quantitative ratios is improved, but ease of manufacture decreases
Solution Approach 1:
The patent inverts the conventional approach by placing the threading mechanism on the discharging piston rather than on the cartridge. This allows simple tubular cartridges to be used without requiring complex internal threading, significantly easing cartridge manufacturing while maintaining precise metering accuracy through the piston's rotational screwing action.
Solution Approach 2:
The patent changes the parameter of where the thread is located - from the cartridge (conventional) to the discharging piston (innovative). This parameter change allows the use of simple tubular cartridges that are easy to manufacture, while the threaded piston provides the necessary metering precision through its rotational engagement with the cartridge's inner wall.
3Manufacturing precision
If threaded bars are rotated to drive pistons forward, then metering precision is improved, but device complexity increases requiring rotational driving mechanisms
Solution Approach 1:
The patent merges the linear pushing function and rotational screwing function into a single discharging piston with an outer thread. The piston simultaneously performs both linear discharge and rotational engagement with the cartridge, integrating multiple functions into one component and reducing overall device complexity while maintaining precise metering control.
Solution Approach 2:
The discharging piston with an outer thread performs the dual function of pushing the component forward and screwing into the cartridge through its own rotational motion. This self-service mechanism eliminates the need for separate rotational driving mechanisms, providing precise metering while simplifying the overall driving system.
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 precise metering and mixing of multi-component substances across varying ratios without the need for specialized cartridges, ensuring high accuracy and flexibility in production conditions.
Implementation Method 1
at least one discharging piston (11) has an outer thread (11.1), such that the discharging piston (11) will be driven forward by the thread (11.1) when the discharging piston (11) is rotated relative to the cartridge (3.1)
Data Source
AI summary
A metering and mixing device is disclosed for multi-component substances, such as multi-component adhesives, which includes at least two associated cartridge accommodating devices for accommodating replaceable cartridges having individual substance components, a discharging device for disclosing (e.g., simultaneously discharging) the substance components from the cartridges through component outlets by discharging pistons that plunge into the cartridge accommodating device or cartridges, and a mixing device, which is connected to the component outlets, mixes the discharged substance components, and outputs the substance components in the mixed state. At least one discharging piston can have a thread such that the discharging piston can be driven forward by the thread when the discharging piston is rotated relative to the cartridge accommodating device.