Removable Milling Device for Grab Frame Drilling Machine
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Solution Overview
Problem
Traditional clamshell grab drilling methods struggle with excavating hard ground, as they are inefficient and noisy, and alternative methods like drill bits and hydromills are slow, expensive, and cumbersome, especially on small construction sites.
Innovation Solution
A drilling machine equipped with a removable milling device featuring mill drums and motors, which can be easily mounted and dismounted to convert the machine between clamshell grab and milling modes, allowing for efficient excavation of hard areas without the need for drill bits or hydromills.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a drill bit is used to break hard ground, then the hard area can be broken, but the effectiveness decreases with each release due to cuttings accumulation, and the method is very slow
Solution Approach 1:
The patent replaces the impact-based drill bit system with a milling system that uses rotational cutting drums with multiple cutting tools. This substitution eliminates the problem of cuttings accumulation absorbing impact shock, as the milling drums continuously cut through hard ground with multiple points of contact, maintaining consistent effectiveness throughout operation.
Solution Approach 2:
The milling device is designed to be interchangeable with the grab buckets, allowing the same material handler to perform both excavation and hard ground breaking functions. This multi-functionality eliminates the need for separate drill bit operations and grab operations, significantly improving productivity by completing hard ground breaking in a single continuous operation.
2Strength
If a hydromill is used to excavate rock, then rock excavation is effective, but the technique is long to implement and particularly expensive, and requires a bulky grit trap
Solution Approach 1:
The milling device is divided into modular components (support structure, milling drums, cutting tools, hydraulic motors) that can be independently manufactured and assembled. This segmentation allows the system to be installed on existing material handlers without requiring a complete system replacement or bulky supporting infrastructure like a grit trap.
Solution Approach 2:
The milling device incorporates movable and adjustable components, including the ability to position and orient the milling drums dynamically during operation. This dynamic design allows adaptation to various excavation conditions and site constraints, eliminating the need for fixed, bulky installation infrastructure.
3Strength
If drill bit is used to break hard ground, then hard area can be broken, but noise pollution and vibrations are generated
Solution Approach 1:
The patent replaces the high-impact drill bit mechanism with a rotational milling system that cuts through hard ground using multiple cutting tools on rotating drums. This substitution fundamentally changes the mechanical action from impact-based to cutting-based, dramatically reducing noise and vibration while maintaining the ability to break hard ground effectively.
4Productivity
If milling device is added to the grab frame, then hard ground can be excavated efficiently, but the device complexity increases
Solution Approach 1:
The milling device is designed as an interchangeable attachment that replaces the grab buckets rather than adding to the existing frame structure. This approach maintains the original grab frame complexity while adding milling capability through a separate, self-contained unit that mounts to existing attachment points.
Solution Approach 2:
The milling device consists of modular segments (support, drums, motors, securing devices) that can be independently installed and maintained. This segmentation reduces overall system complexity by allowing each component to be optimized independently and replaced without affecting the entire 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 efficient excavation of hard ground with reduced noise and vibration, increased trench length, and the ability to make notched joints, while being modular and adaptable for various excavation tasks.
Implementation Method 1
at least a first mill drum, at least a first motor for driving in rotation the first mill drum about a first rotation axis
Data Source
AI summary
The invention relates to a drilling machine (10) including a grab frame (12) which comprises a body (16) extending along a longitudinal direction (L), a movable member (32), a first arm (34) pivotable relative to the movable member, a second arm (36) pivotable relative to the movable member (32), the second arm having a lower end part, at least one actuator device (37) connected to the body to move at least the first arm (34) relative to the body; The invention is characterized in that said drilling machine (10) includes a removable milling device (100) including a first dismountable securing device (120) for removably fixing the support (110) to the body (16), and a second dismountable securing device (150) for removably fixing the support (110) to the first arm, whereby the milling device can be easily dismounted from the frame.