Vertical Lifting Coal Miner Without Rocker Arm
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Solution Overview
Problem
The existing drum coal-mining machines with rocker arms have complex and unreliable cutting transmission systems, prone to failure due to stress concentration and gear engagement forces, which complicates the mining process and reduces reliability.
Innovation Solution
A vertical lifting type drum coal-mining machine without a rocker arm, featuring a compact cutting transmission system with lifting guide rails and sliding cushion blocks, replacing the rocker arm structure and using two-stage gear transmission to simplify the mechanical chain, enhancing stability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rocker arm structure with multiple idler pulley groups is used to achieve cutting reduction, then the mining height requirement is met, but the transmission system becomes complex and reliability decreases
Solution Approach 1:
The patent removes the rocker arm structure entirely from the coal-mining machine, extracting the problematic component that caused complex transmission chains. Instead of modifying the rocker arm, the invention replaces it with a vertical lifting mechanism using guide rails and sliding blocks, fundamentally simplifying the transmission system while maintaining cutting reduction functionality through a different mechanical approach
Solution Approach 2:
The patent inverts the traditional cutting reduction approach by eliminating the rocker arm's multiple pulley groups and replacing them with a vertical lifting mechanism. The cutting drum achieves vertical movement through guide rails and sliding blocks rather than through the rocker arm's complex pulley system, fundamentally reversing the mechanical approach to achieve the same functional goal with simpler components
2Manufacturing precision
If multiple idler pulley groups are disposed in the cutting reduction transmission process, then the required mining height is achieved, but the reliability of the transmission system is reduced
Solution Approach 1:
The patent removes the multiple idler pulley groups from the transmission system, extracting the components that created stress concentration and reliability issues. The replacement vertical lifting mechanism uses guide rails and sliding blocks that distribute forces more evenly, eliminating the bearing hole seats and gear engagement points that were prone to failure
Solution Approach 2:
The patent inverts the transmission approach by replacing the horizontal pulley-based cutting reduction with a vertical rail-based lifting mechanism. This fundamental reversal eliminates the multiple gear engagement points and bearing hole seats that caused reliability problems, using instead a smoother sliding contact system with better force distribution
3Adaptability or versatility
If the rocker arm structure is used, then cutting reduction function is achieved, but stress concentration and gear engagement forces cause easy failure
Solution Approach 1:
The patent extracts the rocker arm structure entirely, removing the component subject to stress concentration and tremendous gear engagement forces. The cutting reduction function is achieved through the vertical lifting mechanism's guide rails and sliding blocks, which distribute mechanical stresses more evenly and eliminate the bearing hole seats that were failure points
Solution Approach 2:
The patent replaces the rocker arm's mechanical gear engagement system with a vertical lifting mechanism using guide rails and sliding blocks. This substitution eliminates the gear engagement forces and bearing hole seat stresses that caused frequent failures, using instead a sliding contact system with better load distribution and fewer stress concentration points
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 solution provides a more reliable and stable coal-mining process by reducing mechanical vibrations, distributing mining forces evenly, and eliminating the need for multiple idler pulley groups, resulting in improved mechanical transmission reliability and reduced failure rates.
Implementation Method 1
lifting cylinders symmetrical-arranged are disposed on a left outer wall and a right outer wall of the left cutting and lifting reduction gear box. The lifting cylinders drive the left cutting and lifting reduction gear box to make lifting motion along the lifting guide rails
Implementation Method 2
The friction between sliding cushion blocks and lifting guide rails reduces mechanical vibrations during lifting
Data Source
AI summary
A vertical lifting type drum coal-mining machine without a rocker arm includes a central control box, left and right cutting and lifting reduction gear boxes, left and right guide rail fixing box bodies, left and right traction reduction gear boxes, and left and right traveling gear boxes. The left and right cutting and lifting reduction gear boxes are provided with slideways in fit with lifting guide rails of the left and right guide rail fixing box bodies. Lifting cylinders drive the left and right cutting and lifting reduction gear boxes to make lifting motion. A cutting gear reduction mechanism adopts two-stage fixed-axle gear transmission and two-stage planetary gear transmission, is free from multiple idler pulley groups and has simple transmission chain. The fit between the lifting guide rails and the slideways enables the entire machine to be compact in structure, and the reliability and stability of operation are improved.