Synchronized Ejection Piston Drive for Multi-Component Adhesive Mixing
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Solution Overview
Problem
Existing dosing and mixing devices for multi-component substances face challenges in ensuring simultaneous expulsion of components with different structures and mechanical properties, leading to potential mismatches during the mixing process.
Innovation Solution
A gear unit with synchronized actuation of ejection pistons and a switchable clutch mechanism ensures that component B is expelled only when component A is provided, using a gear unit with a displaceable assembly and counter-pressure spring elements to automatically switch the clutch when a certain reaction pressure is reached, ensuring synchronized expulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ejection pistons with different drive mechanisms (axial for component A, rotary for component B) are used to accommodate cartridges with different structures and sizes, then adaptability to different cartridge types is improved, but synchronization of component expulsion becomes difficult to control
Solution Approach 1:
A clutch device acts as an intermediary mechanism between the two independently driven ejection pistons. The clutch device includes a clutch element that can engage or disengage based on reaction pressure, mediating the synchronization between the axial-driven piston (component A) and rotary-driven piston (component B). This allows different drive mechanisms to work together reliably without requiring complex control systems.
Solution Approach 2:
The system uses reaction pressure feedback from the cartridge to control synchronization. When the axial ejection piston encounters resistance (reaction pressure) during component A expulsion, this feedback signal triggers the clutch device to engage, which then activates the rotary ejection piston for component B. This feedback mechanism ensures both components are expelled simultaneously despite different drive mechanisms.
2Reliability
If a clutch device with displaceable assembly and counter-pressure spring is used to automatically switch based on reaction pressure, then synchronization control is improved, but device complexity increases
Solution Approach 1:
The clutch device is designed to operate automatically based on reaction pressure without requiring external control signals or complex electronics. The counter-pressure spring element and displaceable assembly create a self-regulating system where the reaction pressure from component A expulsion automatically triggers the engagement of the clutch, which then activates component B expulsion. This self-service mechanism reduces control system complexity while maintaining reliable synchronization.
3Adaptability or versatility
If the first ejection rod is designed as a toothed rack for axial drive and the second as a spindle with thread for rotary drive, then adaptability to different cartridge mechanical properties is improved, but manufacturing precision requirements increase
Solution Approach 1:
The ejection mechanism is segmented into two independent drive systems: an axial toothed rack for component A and a rotary spindle with thread for component B. Each segment is optimized for specific cartridge types and mechanical properties. The gear unit connects these segmented drives through the clutch mechanism, allowing each segment to be manufactured with standard precision while achieving overall system adaptability.
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 ensures precise and reliable expulsion of both components, preventing mismatches and ensuring accurate mixing, even with cartridges of different sizes and mechanical properties, and allows for easy reloading with minimal resistance.
Implementation Method 1
a gear unit for connecting a drive machine (9), which has coupling means for forcibly connecting an ejection of at least two material components by correspondingly synchronized actuation of the corresponding ejection pistons (11, 211) via an ejection rod (4, 5) each
Implementation Method 2
at least one ejection piston has a thread which can generate a forward drive of this ejection piston by rotation
Implementation Method 3
the displaceable assembly (or the clutch element assigned to it) is assigned a counter-pressure spring element, which provides a counter-pressure force that opposes the reaction pressure when component A is discharged
Data Source
Figure 1~2
Figure 3A~4
Figure 5
AI summary
The invention relates to a drive apparatus (1B) of a metering and mixing device (1A) for multi-component materials, in particular multi-component adhesives, which metering and mixing device has at least two cartridge-accommodating devices (2, 3) for accommodating replaceable cartridges (2.1, 3.1) having individual material components, a discharging device for simultaneously discharging the material components from the cartridges (2.1, 3.1) through component outlets by means of discharging plungers (11, 16) that plunge into the cartridge-accommodating device (2, 3), and a mixing device (7), which is connected to the component outlets and mixes the discharged material components and dispenses the material components in the mixed state, comprising a transmission unit (8) for connecting an in particular electric drive machine (9), wherein the transmission unit (8) has coupling means (24) for the forced connection of a discharge of at least two material components by correspondingly synchronized actuation of the corresponding discharging plungers (11, 16) by means of respective discharging rods (4, 5).