Electro Spindle Turret Head for Low-Vibration Surface Grinding
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Solution Overview
Problem
Existing grinding heads experience vibrations and shocks during operation, leading to potential material damage and inefficient distribution of grinding element wear, with existing solutions either failing to fully mitigate noise or being unsuitable for flexible or curved surfaces.
Innovation Solution
An operating head with a train of electric spindles, utilizing permanent magnet motors for high power density and a fluid-dynamic cylinder for mass compensation, along with a joint for energy transmission, allows for reduced volume and high mechanical performance, enabling effective grinding on thin or curved surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mechanical transmission with internal ring gear and spur gears is used to drive grinding rolls, then the grinding elements can be distributed uniformly on the surface, but continuous shocks and vibrations circulate through the gear train, risking resonance and potential damage
Solution Approach 1:
The patent replaces the mechanical gear transmission system with an electric motor directly coupled to each spindle. This eliminates the internal ring gear and spur gears that transmitted shocks and vibrations, while maintaining the ability to drive multiple grinding rolls independently and uniformly
Solution Approach 2:
The patent divides the grinding head into multiple independent spindle units, each with its own electric motor. This segmentation allows each spindle to be driven independently without mechanical coupling through a common gear train, thereby isolating vibration sources while maintaining uniform grinding element distribution across the surface
2Device complexity
If traditional mechanical spindles with hydraulic or pneumatic cylinders are used, then the structure can be compact with the cylinder axis coinciding with the spindle body, but the overall dimensions remain large and flexibility for curved surfaces is limited
Solution Approach 1:
The patent replaces hydraulic or pneumatic cylinder-spindle mechanisms with electric motors directly mounted on the operating head. This substitution dramatically reduces the volume and overall dimensions while maintaining the compact structure, as electric motors are significantly more space-efficient than hydraulic/pneumatic actuation systems
Solution Approach 2:
The patent changes the actuation mechanism from hydraulic/pneumatic to electric, which fundamentally alters the size and dimensional parameters of the operating head. The electric motor allows for a more compact design with reduced radial and axial dimensions, enabling flexibility for working on curved surfaces
3Device complexity
If multiple spindles are connected to a common mechanical transmission system, then the device complexity is reduced, but vibrations and shocks from one spindle can resonate with others, reducing reliability
Solution Approach 1:
The patent segments the drive system into multiple independent electric motor-spindle units, each operating autonomously without mechanical coupling to other spindles. This eliminates the resonance problem that occurs in common mechanical transmission systems while maintaining manageable device complexity through standardized motor units
Solution Approach 2:
The patent introduces electric motors as intermediary devices between the power source and the spindles. Each motor acts as an independent mediator, converting electrical energy to mechanical rotation without mechanical coupling to other spindles, thereby preventing vibration and shock transmission that would cause resonance in a common mechanical transmission 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
The solution provides a compact, high-performance grinding head with reduced overall dimensions, capable of uniformly processing flexible or curved surfaces without overworking edges or corners, while minimizing vibrations and optimizing abrasion efficiency.
Implementation Method 1
Each spindle (12) is connected to a respective synchronous motor with permanent magnets, the rotor and the stator of which belong to a synchronous motor with permanent magnets, the permanent magnets mounted on the rotor surface or inserted inside the rotor
Implementation Method 2
at least one fluid-dynamic cylinder (20) of vertical approach connected to the central structure (10) to balance an overall mass
Data Source
Figure 1~2
Figure 3
AI summary
An operating head with electro spindles comprises a central structure (10) rotating orthogonally to a work plane, able to support a plurality of electro spindles distributed on a circumference with the same angular distance, the axis of rotation of each electro spindle disposed radially with respect to the axis of rotation of the central structure (10). The central structure (10) comprises a substantially polygonal prismatic turret provided on each side face of a flanged seat (11) adapted to receive and support a cylindrical casing (12) of each electro spindle.