Rotating Cutting Head for Tunnel Roof Shaping
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Solution Overview
Problem
Current methods for driving tunnels and galleries are time-consuming, energy-intensive, and costly due to the need for extensive rock cutting and stabilization, particularly in forming desired roof shapes and securing the rock face.
Innovation Solution
A method and rig that utilize a rotating cutting head with radially outwardly directed cutting elements to create vaulted roof profiles by performing side cuts at a skewed angle, reducing the number of cuts required and stabilizing the rock face more effectively, while minimizing energy consumption and wear on cutting tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional cutter wheels with bar-like working tools are used to sweep and cut rock surfaces, then rock working can be performed, but the process is time-consuming and energy-intensive
Solution Approach 1:
The cutting head is divided into multiple independent cutting elements (cutting teeth, cutters, or cutting rolls) arranged radially around the rotation axis. Each element independently cuts rock, allowing parallel processing and significantly increasing productivity while reducing energy consumption per unit compared to single-point cutting methods
Solution Approach 2:
The cutting head is designed with a rotational symmetry around a central axis, with cutting elements arranged radially outwardly. This spherical/rotational geometry allows the entire cutting head to rotate and present multiple cutting points simultaneously to the rock face, enabling continuous cutting action that increases tunneling speed and reduces energy consumption
2Reliability
If multiple cuts are performed to form desired roof shapes and secure rock faces, then stabilization is achieved, but the number of operations increases time consumption
Solution Approach 1:
The cutting head is designed to perform multiple cutting operations simultaneously in a single rotational cycle. By arranging cutting elements radially, the system pre-cuts multiple sections of the roof and rock face in one operation, reducing the total number of sequential cuts needed and thereby decreasing time consumption while maintaining structural stability
Solution Approach 2:
The rotational cutting head continuously engages with the rock face, maintaining constant cutting action as it rotates. This continuous operation eliminates idle time between cuts and ensures uninterrupted rock working, significantly reducing the total time required compared to intermittent cutting methods
3Productivity
If cutting elements are positioned distributed around the envelope surface of the cutting head, then cutting efficiency is improved, but device complexity increases
Solution Approach 1:
The cutting head is designed as a universal rotational assembly where multiple cutting elements (teeth, cutters, or rolls) share a common rotational function. This multi-functional design allows a single structural unit to perform multiple cutting operations simultaneously, improving productivity without proportionally increasing device complexity
Solution Approach 2:
Multiple cutting elements are merged into a single integrated cutting head assembly that rotates together. By combining the functions of multiple individual cutters into one unified rotational structure, the system achieves high cutting efficiency while keeping the overall device structure manageable and coordinated
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 approach allows for faster and more efficient tunneling with reduced energy consumption, fewer cuts needed to achieve a stable vaulted roof profile, and easier rock face stabilization compared to traditional methods, resulting in cost savings and improved operational efficiency.
Implementation Method 1
a cutting head (4) having outwardly directed cutting elements (7), wherein the cutting head (4) is applied against a rock surface to be worked by this area of the envelope surface being brought to engagement with the rock
Implementation Method 2
rock cutting elements (7) distributed around the area of the envelope surface of the cutting head (4)... performing tunnel side cuts essentially in parallel with said longitudinal axis with the rotated cutting head advancing with the angle of operation being a skewed angle
Data Source
AI summary
A method and rig for driving tunnels, galleries, shafts or the like. The rig has a movable base unit that over a support unit supports a carrying unit which in turn carries a cutting head having outwardly directed cutting elements. The method includes rotating the cutting head around a general axis of rotation and applying the cutting head against a rock surface to be worked. The carrying unit is swung into a first chosen mutual position in respect of the support unit. The support unit is rotated into a second chosen mutual position with respect to the base unit around an axis that is essentially longitudinal with respect to the base unit. An angle of operation of the cutting head is controllable.