Dual-Mode Cutting Arm Drive for High-Torque Rock Undercutting
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Solution Overview
Problem
Conventional rock cutting machines face challenges in transmitting high torque efficiently during undercutting operations, leading to low transmission speeds and the need for costly and time-consuming customization for different mining sites, especially when cutting hard rock exceeding 120 MPa strength.
Innovation Solution
A cutting apparatus with a drive train configuration that allows for two operating modes: a first mode with higher torque at lower velocities and a second mode with higher velocities at lower torque, utilizing an auger drive and planetary drive coupled in series, enabling adaptable transmission ratios and safer arm movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanisms which allow for high torque transmission are used during undercutting operation, then torque transmission reliability is improved, but transmission speed becomes very low
Solution Approach 1:
The patent applies dynamics by making the drive train configuration changeable during operation. The system can switch between first and second operating modes, where the first mode provides high torque transmission for undercutting operations and the second mode provides higher transmission speeds for other operations. This dynamic reconfiguration resolves the contradiction by allowing the system to optimize for either torque or speed depending on the operational requirements.
2Strength
If conventional rock cutting machines are used for hard rock exceeding 120 MPa strength, then cutting capability is limited, but customization for different mining sites becomes necessary and costly
Solution Approach 1:
The patent applies universality by designing a cutting apparatus that can operate in multiple modes (first and second operating modes) to handle different rock types and mining conditions. The drive train can be selectively configured to provide either high torque for hard rock undercutting or higher speeds for other operations, making the machine adaptable to various mining sites without requiring costly customization. This multi-functionality allows a single machine design to serve multiple purposes across different geological conditions.
3Productivity
If the at least one arm is slewed laterally outward and raised during forward cutting, then cutting efficiency is improved, but significant torque is required which limits movement speed
Solution Approach 1:
The patent resolves this contradiction by implementing a dynamic drive train that can switch between operating modes. During undercutting operations where high cutting efficiency is required, the first operating mode provides the necessary high torque for lateral slewing and raising of the arm. For other operations where speed is more critical, the second operating mode provides higher transmission speeds. This dynamic adaptation allows the system to achieve both high productivity during cutting and faster movement during repositioning.
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 configuration enables reliable torque transmission, rapid mine development, and efficient cutting of hard rock with variable cross-sectional areas, while minimizing collateral damage and optimizing arm movement for safe operation.
Implementation Method 1
significant torque needs to be transmitted in particular when operating in undercutting mode
Implementation Method 2
drive train configuration that allows for two operating modes: a first mode with higher torque at lower velocities and a second mode with higher velocities at lower torque
Implementation Method 3
utilizing an auger drive and planetary drive coupled in series, enabling adaptable transmission ratios
Implementation Method 4
planetary drive coupled to one another in series
Data Source
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AI summary
Cutting apparatus (100) suitable for creating tunnels or subterranean roadways and the like comprising: at least one arm (121) pivotally mounted to the apparatus and adapted to pivot in an upward and downward direction; at least one arm actuator (122, 130) to actuate pivoting movement of the at least one arm (121); wherein the actuator (122) comprises: a drive motor unit (130) and a drive train (123) coupled to the drive motor unit,the drive motor unit and drive train being configured for selective operation in one of: a first operating mode in which a first pivoting velocity and first torque are transmitted to the at least one arm (121), or a second operating mode in which a second velocity and second torque are transmitted to the at least one arm (121), the first velocity being lower than the second velocity and the first torque being higher than the second torque.