Flexible Feed Hose Valve Nesting for Resin Injection
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Solution Overview
Problem
Existing methods for injecting grouting resin into drilled holes for rock reinforcement are inefficient and prone to issues such as hole collapse and difficulty in retracting the feed system.
Innovation Solution
A novel apparatus comprising an injector head with a mixing device and a flexible feed hose that surrounds the fluid inlet system, allowing for controlled injection of resin base component A and catalyst B into drilled holes, with a valve assembly for controlling the feed and a design that prevents the feed hose from increasing the diameter of the feed system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a valve assembly is added to control resin feeding, then the control precision is improved, but the device complexity increases and the feed system diameter increases
Solution Approach 1:
The valve assembly is positioned inside the feed hose, creating a nested configuration where the valve is contained within the hose lumen. This nesting approach allows the valve to be integrated without increasing the overall external diameter of the feed system, resolving the contradiction between adding control functionality and maintaining compact dimensions.
Solution Approach 2:
Instead of adding the valve assembly in the radial direction (which would increase diameter), the invention places it in the axial direction inside the existing feed hose pathway. This dimensional repositioning allows control functionality to be added without increasing the feed system's external diameter.
2Manufacturing precision
If the feed system diameter is increased to accommodate valve assembly, then the control precision is improved, but the ease of operation deteriorates due to difficulty in retracting from collapsed holes
Solution Approach 1:
By nesting the valve assembly inside the feed hose rather than mounting it externally, the overall diameter of the feed system remains unchanged. This maintains the ability to retract the feed system from collapsed drilled holes while still providing precise control over resin feeding through the integrated valve.
3Manufacturing precision
If a rigid feed system is used for stable resin feeding, then the manufacturing precision is improved, but the ease of operation deteriorates due to difficulty in feeding into and retracting from drilled holes
Solution Approach 1:
The feed hose is made flexible to enable dynamic movement during feeding and retraction operations, while the valve assembly inside provides static control precision. This combination allows the system to adapt to varying operational conditions (easy feeding/retraction) while maintaining stable resin feeding control.
Solution Approach 2:
The feed hose is constructed as a flexible tube that can bend and deform to navigate collapsed or irregular drilled holes. This flexibility enables easy insertion and retraction operations while the internal valve assembly maintains precise control over the resin feeding process.
4Adaptability or versatility
If multiple separate components are used for injector head, mixing device, and valve assembly, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The injector head, mixing device, and valve assembly are combined into a single integrated apparatus where the valve assembly is positioned inside the feed hose connected to the injector head. This merging reduces the number of separate components to be managed while maintaining the adaptability of each functional element for different resin feeding applications.
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 enables efficient and controlled injection of grouting resin into drilled holes, preventing hole collapse and facilitating easy removal of the feed system, while being cost-effective and suitable for use in various rock drilling rigs and existing mining devices.
Implementation Method 1
the feed hose is flexible so that it bends, and its cross profile deforms temporarily during the axial movement if needed
Implementation Method 2
An outer surface of the feed hose has a low friction coefficient. Also, this feature facilitates feeding of the feed system and allows the feed system to be retracted also from damaged drilled holes
Implementation Method 3
The mixing device is configured to mix the fed resin base component A and the catalyst B together
Implementation Method 4
The injector head comprises a valve assembly for controlling feeding of the grouting material
Data Source
AI summary
An apparatus for injecting grouting material, mining machine and method of injecting grouting resin into several drilled holes is provided. The apparatus includes an injector head provided with a mixing device, which are both insertable into a drilled hole by a flexible feed hose. The injector head includes a valve assembly mounted inside a distal end portion of the feed hose.