Grinding Spindle Eccentric Shaft Oscillation Mechanism
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Solution Overview
Problem
Existing grinding units lack a simple and robust design with minimal installation space, limiting their versatility and effectiveness in processing large-area surfaces such as wood or wood substitutes.
Innovation Solution
A grinding unit with a torsionally rigid and longitudinally displaceable eccentric shaft mounted on the grinding spindle, featuring a spring-loaded sanding disc that moves on a circular path with minimal rotation relative to the spindle, allowing for efficient processing of large surfaces using interchangeable sanding discs or brushes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional grinding unit design is used, then the structure may be complex or require large installation space, but the invention achieves a simple and robust design with small installation space
Solution Approach 1:
The grinding unit is divided into separate functional modules: the eccentric shaft assembly, the sanding plate assembly, and the mounting interface. This segmentation allows each component to be optimized independently while maintaining overall simplicity and robustness.
Solution Approach 2:
The eccentric shaft design serves multiple functions: it provides the oscillating motion, supports the sanding plate, and interfaces with the grinding spindle. This multi-functionality reduces the number of separate components needed, achieving simplicity without sacrificing reliability.
2Ease of operation
If the sanding disc is freely movable in at least one direction of rotation relative to the grinding spindle, then the abrasive moves on a circular path with little or no rotation of its own, but this requires precise control of the eccentric shaft
Solution Approach 1:
The sanding plate is made freely movable relative to the grinding spindle through the eccentric shaft mechanism, allowing dynamic adjustment of the abrasive's circular path. This dynamic design enables precise contact pressure control while the eccentric shaft handles the rotational control automatically.
Solution Approach 2:
The eccentric shaft self-generates the oscillating motion and controls the sanding plate's movement without requiring external control systems. The mechanism uses the spindle's rotation to automatically create the desired circular path, reducing control complexity.
3Manufacturing precision
If spring elements are used to press the grinding unit against the workpiece surface, then precise contact pressure is achieved, but the device complexity increases
Solution Approach 1:
The spring elements are integrated into the existing structure, using the weight of the eccentric shaft and sanding plate assembly to provide the contact pressure. This self-service approach achieves precise contact pressure without requiring separate complex pressure control mechanisms.
Solution Approach 2:
The contact pressure is controlled by adjusting the spring element stiffness and pre-load, which are straightforward parameter changes rather than complex control systems. This allows precise pressure control while keeping the device simple.
4Productivity
If the eccentric shaft is made torsionally rigid and longitudinally displaceable, then the grinding unit can process large-area surfaces efficiently, but the shaft design becomes more complex
Solution Approach 1:
The eccentric shaft is designed with segmented structural features that provide torsional rigidity in the critical regions while allowing longitudinal displacement. This segmentation enables efficient processing of large surfaces without requiring an entirely complex shaft design.
Solution Approach 2:
The eccentric shaft may use composite construction or material combinations that provide the required torsional rigidity and longitudinal displacability. This approach achieves high productivity while keeping the shaft design manageable through material selection rather than complex geometry.
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
The solution enables efficient processing of large-area surfaces with precise contact pressure and reduced rotation, enhancing the grinding unit's versatility and effectiveness for applications like woodworking, while maintaining a compact design.
Implementation Method 1
The tool is pressed against the workpiece surface to be processed by spring elements arranged in the grinding unit. For example, there are spring elements, e.g. disc springs, which are combined into stacks or packages.
Implementation Method 2
an electric motor in a housing causes an oscillating movement of a grinding disk covered with an abrasive by means of an eccentric shaft
Implementation Method 3
the sanding plate is suspended from the housing in such a way that it can oscillate transversely to the eccentric shaft. The center of the sanding disc is supported on the eccentric pin by means of a roller bearing.
Implementation Method 4
a grinding unit with an eccentric shaft arranged in a grinding spindle for supporting a grinding disk carrying an abrasive
Implementation Method 5
the abrasive moves on a circular path with little or no rotation of its own in relation to the grinding spindle
Data Source
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AI summary
The grinding unit has a grinding spindle (10) that is arranged on the eccentric shaft (50), and a grinding structure (170) for holding the grinding wheel (140). A rolling bearing is supported on free end of eccentric shaft through grinding disc housing, in opposite to rotation direction of spindle. The eccentric shaft is equipped with balancing portions. A freewheel is arranged between eccentric shaft and grinding spindle.