Rotatable Tool Holder on Pivoted Arm for Heading Machine
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Solution Overview
Problem
Existing heading machines with pivotable disc tools are limited in their ability to deviate from straight road courses and change profile heights without complex conversion work, and they face challenges in advancing performance, especially when dealing with hard rock, due to their design and the need for continuous contact with the material.
Innovation Solution
The heading machine features a rotatably mounted tool holder on a pivoted arm with a transverse rotational axis, allowing disc tools to contact the material over part of the tool holder's circumference, enabling variable road widths and heights with improved advancing performance by varying the tool holder's orientation and using a crawler track for mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If disc tools are arranged to operate in an undercutting manner with continuous contact with the material, then the cutting action is maintained, but the advancing performance is limited and the machine requires complex bracing structures
Solution Approach 1:
The cutting tools are mounted on a rotatable tool holder that can be pivoted in the vertical direction, allowing dynamic adjustment of the cutting configuration. The tool holder rotates about an axis perpendicular to the longitudinal axis of the arm, enabling the tools to engage the material in a non-continuous manner that increases penetration depth while maintaining control through rotational motion
Solution Approach 2:
The cutting action is segmented by allowing the tool holder to rotate, so that disc tools contact the material over only part of the circumference rather than continuously. This segmentation of the cutting action allows for deeper penetration between contact points while reducing the need for complex continuous support structures
2Adaptability or versatility
If the tool holder is designed for full-thickness cutting with continuous tool contact, then cutting stability is maintained, but the machine cannot be configured as autonomously moveable and requires bracing between roof and floor
Solution Approach 1:
The tool holder is mounted on an arm that can be pivoted in the vertical direction, creating a dynamic system that can adapt to different cutting positions and profiles. This pivoting capability allows the machine to operate autonomously without requiring fixed bracing between roof and floor, while the rotational mechanism maintains cutting stability through controlled tool engagement
Solution Approach 2:
The arm structure serves multiple functions: it supports the tool holder, provides pivoting capability for vertical adjustment, and enables the machine to cut different profile heights and road widths. This multi-functionality eliminates the need for separate bracing structures while maintaining operational stability
3Productivity
If disc tools are arranged to increase the proportion of broken material through undercutting, then cutting effectiveness on certain rock states is improved, but the penetration depth remains limited and advancing performance is constrained
Solution Approach 1:
The tool holder rotates about an axis perpendicular to the arm's longitudinal axis, creating a dynamic cutting pattern that combines undercutting action with rotational motion. This allows the tools to engage the material at different angles during rotation, increasing penetration depth while maintaining the ability to follow curved road courses through the pivoting arm mechanism
4Adaptability or versatility
If the machine is designed with fixed tool holder configuration, then structural simplicity is maintained, but changing profile heights requires complex conversion work
Solution Approach 1:
The arm is designed to pivot in the vertical direction, allowing the tool holder to be positioned at different heights and angles. This dynamic positioning capability enables the machine to cut various profile heights without requiring complex conversion work, as the pivoting mechanism can be adjusted to accommodate different operational requirements
Data Source
AI summary
In a heading machine (1, 24) with at least one cutting unit with a rotatably mounted tool holder (10, 39) with disc tools (11, 12, 40, 41), which tool holder is connected in a pivotable manner to the machine frame, the heading machine (1, 24) has a running gear, in particular a crawler track (2), the tool holder (10, 39) is mounted rotatably on an arm (6, 26), which can be pivoted in the vertical direction and the rotational axis (9) of the tool holder (10, 39) runs transversely with respect to the longitudinal axis of the arm (6, 26).