Drive Shaft Insertion Device Cooling Water Flow
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Solution Overview
Problem
Core drilling machines experience excessive heat buildup due to high energy consumption, leading to reduced performance and risk of damage or injury from overheated components, particularly when drilling in mineral rock without effective cooling.
Innovation Solution
A drive shaft with a cavity along its rotational axis, featuring an insertion device that guides water through the shaft in two directions, maximizing heat absorption by increasing contact area and flow volume, and including a guide element configured spirally, planar, or as a tube with longitudinal ribs to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water is fed along the drive shaft into the drilling tool for flushing, then the drill bit can be flushed effectively, but the drive shaft and core drill experience excessive heat buildup
Solution Approach 1:
The system uses the flushing water itself to cool the drive shaft by guiding it through the cavity in multiple directions, allowing the water to absorb heat from the drive shaft walls before reaching the drill bit. This self-service approach eliminates the need for separate cooling systems.
Solution Approach 2:
The insertion device with guide elements acts as an intermediary between the water supply and the drive shaft, directing water flow to maximize heat absorption from the drive shaft cavity walls while still delivering water to the drill bit for flushing.
2Temperature
If the water flow path is extended through the cavity to increase heat absorption, then cooling efficiency improves, but the water contact time and flow rate may be reduced
Solution Approach 1:
The guide elements are configured with spiral, planar, or tubular geometries that extend the water flow path through the cavity volume, increasing the surface area for heat exchange without significantly increasing the axial length of the drive shaft.
Solution Approach 2:
The guide elements utilize curved and spiral configurations to extend the water flow path length within the available cavity volume, maximizing heat absorption opportunity while maintaining compact dimensions.
3Temperature
If the guide element is configured with complex geometries (spiral, planar, tubular with ribs), then the contact area with water increases for better cooling, but the device complexity increases
Solution Approach 1:
The insertion device combines multiple functions: it guides water flow, provides cooling surfaces, and can be configured in various geometries (spiral, planar, tubular) to adapt to different drive shaft cavity sizes and cooling requirements, making it a universal solution for different applications.
Solution Approach 2:
The guide elements are positioned strategically within the cavity to maximize contact with the hottest regions of the drive shaft walls, concentrating cooling effectiveness where it is most needed rather than distributing it uniformly.
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 effectively cools the drive shaft and core drill, preventing damage and user injury by efficiently utilizing water for both flushing and cooling, thereby maintaining performance and safety during core drilling operations.
Implementation Method 1
the water is then guided to cool the drive shaft first in a first direction and then in a second direction, wherein the water has direct contact with the inside of the cavity at least in the first direction
Implementation Method 2
higher heat absorption may be generated by the water and thus better cooling
Data Source
AI summary
A drive shaft for a machine tool, for example a core drilling machine, able to be connected to a drilling tool, in particular a core bit, is disclosed. The drive shaft contains a cavity which substantially extends over the whole length of the drive shaft and along the rotational axis. The cavity contains at least one inflow opening where, through the at least one inflow opening, water can be fed along the drive shaft into the drilling tool. In the drive shaft, an insertion device is provided in the cavity, through which water is guided for cooling the drive shaft, firstly, in a first direction and then in a second direction, where the water comes into direct contact with the inner side of the cavity at least in the first direction.