Vacuum-Held Drill Base With Balanced Self-Feed Force
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Solution Overview
Problem
Existing drilling systems require manual adjustment of holding and driving forces, leading to operator fatigue and unreliable self-holding on varying object surfaces, with existing self-holding devices failing to account for opposing forces during drilling.
Innovation Solution
A self-holding and self-driving drill system with a vacuum gripper base and air extraction mechanism, featuring a peripheral and inner seal, and a drilling assembly with piston tubes, which maintains a holding force greater than the driving force through differential pressure and surface area ratios, ensuring consistent contact with the object surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual holding force is applied by operator, then drilling operation can be performed, but operator fatigue occurs and operation becomes tedious
Solution Approach 1:
The drilling system automatically maintains holding force through vacuum pressure without requiring continuous manual adjustment. The vacuum gripper base self-regulates the holding force by maintaining a vacuum seal between the base and object surface, eliminating the need for operator intervention and preventing fatigue.
Solution Approach 2:
The manual mechanical holding force application is replaced with a vacuum-based holding system. The vacuum gripper base uses atmospheric pressure differential to generate holding force, substituting the operator's mechanical force application with an automated pneumatic system.
2Force
If vacuum gripper is used for self-holding, then holding force is generated, but drill pushing force can lift the base from surface
Solution Approach 1:
The holding and driving functions are separated into distinct components. The vacuum gripper base provides holding force through vacuum pressure, while the drilling assembly provides driving force through pneumatic actuators. This segmentation allows independent optimization of each function and prevents interference between holding and driving forces.
Solution Approach 2:
Different regions of the system have different pressure characteristics. The first volume (vacuum chamber) maintains low pressure for holding, while the second volume (actuator chamber) maintains low pressure for driving. This local pressure differentiation enables simultaneous holding and driving operations without compromising base stability.
3Reliability
If feedback mechanism with sensors and actuators is used, then holding force can be adjusted, but system cost increases prohibitively
Solution Approach 1:
The system passively maintains holding force through vacuum pressure without requiring active sensing or control. The vacuum seal automatically adjusts to maintain contact, eliminating the need for sensors, actuators, and control systems while keeping the design simple and cost-effective.
Solution Approach 2:
The vacuum gripper base is designed with a compliant seal that anticipates and compensates for drilling forces before they can cause base lift-off. The seal element conforms to surface irregularities and maintains vacuum seal integrity under varying loads, providing passive compensation without active control.
4Adaptability or versatility
If vacuum gripper performance varies across materials, then universal application is limited, but material-specific adjustment complicates operation
Solution Approach 1:
The vacuum gripper base is designed to work with multiple object surface materials through its compliant seal element. The seal can conform to different surface geometries and materials, providing universal applicability across wood, metal, plastic, and other materials without requiring material-specific adjustments.
Solution Approach 2:
The seal element is designed to be dynamically compliant, allowing it to adapt its shape and pressure distribution based on the object surface characteristics. This dynamic compliance enables consistent vacuum sealing performance across different materials and surface conditions without manual adjustment.
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 system provides reliable, fail-proof, autonomous operation by maintaining a consistent holding force greater than the driving force, preventing the drill from lifting off the surface, thus reducing operator fatigue and ensuring safe operation across different materials.
Implementation Method 1
The activity of the air extraction means creates a low-pressure environment in a first volume contained by the sealing element, the vacuum gripper base, and an object surface. A delta pressure between the first volume and the immediate environment generates a holding force which causes the sealing element to conform to the object surface
Implementation Method 2
a driving force is exerted upon the drilling apparatus by a low-pressure environment in the second volume. The driving force is equal to an opposing force exerted upon the drilling apparatus by the object surface during regular operation
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A self-holding drilling system (100) utilizes a vacuum gripping base (110) and an air extraction pump to apply a holding force toward an object surface while maintaining surface-ward pressure on a drilling apparatus mounted therein. The pump extracts air from two discrete, but coupled volumes: a volume associated with the vacuum gripping base and a volume related to one or more piston tubes (130) mounted transversely to the vacuum gripping element and movably coupled to the drilling apparatus. The surface area of the piston tubes is less than the surface area of the vacuum gripping base, which ensures the holding force is sufficient to prevent the drilling system from lifting from the object surface while also ensuring a driving force on the drilling apparatus is always less than the holding force. Thus, the operation of the drilling apparatus automatically drills into an object surface without requiring manual pressure on the drilling apparatus.