Portable Rail Broaching Machine for Precision Sensor Mounting
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Solution Overview
Problem
Existing techniques for creating holes in railroad rail webs fail to produce accurate diameters and smooth inner surfaces required for strong press fitting of sensors, which is essential for precise sensor measurement accuracy.
Innovation Solution
A portable broaching machine with a support structure, pulling head, acme screw, and gearbox assembly that allows for manual or battery-powered operation, using a broach to accurately increase the diameter and smooth the inner surface of pilot holes drilled in the rail web, ensuring a strong press fit for sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hole creation techniques are used, then the process is simple, but the hole diameter accuracy and inner surface smoothness are insufficient for strong press fit
Solution Approach 1:
The broaching machine is divided into modular components including a broach tool with multiple cutting stages, a support structure with adapter plates, and a manual or powered actuation system. This segmentation allows each component to perform a specific function while maintaining overall system portability and ease of assembly/disassembly for field operations.
Solution Approach 2:
Alignment pins and corresponding alignment bushings serve as intermediary elements between the adapter plates and broach tool, ensuring precise positioning and maintaining the required hole diameter accuracy and surface smoothness throughout the broaching process.
2Weight of moving object
If hydraulic actuators are used in broaching machines, then powerful linear motion is achieved, but the machine becomes heavy and non-portable for field applications
Solution Approach 1:
The patent replaces hydraulic actuation systems with manual mechanical actuation methods including chain drives, gear mechanisms, or simple lever systems. This substitution dramatically reduces machine weight and complexity while still generating sufficient linear motion power to push the broach through the rail web for creating precision holes.
3Ease of operation
If a portable broaching machine is designed, then field applicability is improved, but the structural complexity increases
Solution Approach 1:
The adapter plates are designed with movable components including sliding broach tools, adjustable alignment mechanisms, and detachable mounting features. This dynamic design allows the structure to adapt to different rail configurations and field conditions while maintaining portability and reducing the need for complex fixed structures.
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 the creation of holes with precise diameters and smooth surfaces, facilitating accurate sensor installation and data collection, while being lightweight, compact, and suitable for field applications, eliminating the need for hydraulic actuators and ensuring alignment accuracy.
Implementation Method 1
an acme screw engaging the pulling head for linearly moving the pulling head along a portion of the support structure
Implementation Method 2
A gearbox assembly is also supported by the support structure and engages with the acme screw for translating an applied rotational force into linear motion of the acme screw and the pulling head
Implementation Method 3
using a broach to accurately increase the diameter and smooth the inner surface of pilot holes drilled in the rail web
Data Source
AI summary
A broaching machine includes a support structure, a pulling head for releasably coupling to an end of a broach, and an acme screw coupled to the pulling head for linearly moving the pulling head along a portion of the support structure. A gearbox assembly is supported by the support structure and is coupled to the acme screw for translating an applied rotational forced into linear motion of the acme screw and the pulling head. A first adapter plate is supported by the support structure for mating with a compatible second adapter plate coupled to a railroad rail. The first adapter plate includes an aperture allowing a broach coupled to the pulling head to linearly travel through a pilot hole formed through the railroad rail in response to the applied rotational force and responsive linear motion of the acme screw and the pulling head.