Adzer Machine Head Assembly Failsafe Spring Mechanism
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Solution Overview
Problem
Adzer machines face issues during hydraulic failure conditions, where double-acting hydraulic cylinders can suddenly lose pressure, causing uncontrolled movement of skids into cross ties or between them, leading to damage during transport operations.
Innovation Solution
A head assembly with a single-acting hydraulic cylinder and a spring mechanism that biases the skid back toward the lift frame, ensuring controlled movement and preventing damage by retracting the skid in case of hydraulic failure or at the end of the resurfacing operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If double-acting hydraulic cylinders are used to raise and lower skids, then the skids can be positioned during transport and resurfacing operations, but during hydraulic failure the skids may drop uncontrolled causing damage
Solution Approach 1:
A spring mechanism is pre-installed between the skid and lift frame to provide automatic cushioning and position control during hydraulic failure. The spring is positioned to engage when hydraulic pressure is lost, preventing uncontrolled skid movement before damage can occur.
Solution Approach 2:
The spring acts as an intermediary element between the hydraulic cylinder and skid system. It mediates the force transmission, providing a mechanical backup that maintains skid position control when the hydraulic system fails.
2Reliability
If single-acting hydraulic cylinder with spring is used, then skid position is controlled during hydraulic failure, but the system complexity changes
Solution Approach 1:
The return stroke function is extracted from the hydraulic cylinder and assigned to a mechanical spring system. This allows the use of a simpler single-acting hydraulic cylinder instead of a more complex double-acting cylinder, while maintaining the required bidirectional skid movement capability.
Solution Approach 2:
The spring mechanism provides self-service by automatically returning the skid to its elevated position when hydraulic pressure is lost or reduced. The system uses the natural elastic properties of the spring to perform the return function without requiring additional hydraulic control.
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
Prevents uncontrolled skid movement and damage to the adzer machine and railroad tracks by maintaining skid position during hydraulic failures and facilitating safe transport by automatically retracting the skids when pressure is lost.
Implementation Method 1
a spring connecting the skid to the lift frame
Data Source
AI summary
A head assembly is provided for use with adzer machine. The head assembly may have a lift frame, and a cutting head rotationally connected to the lift frame. The head assembly may also have a skid, and a single-acting hydraulic cylinder connecting the skid to the lift frame. The head assembly may further have a spring connecting the skid to the lift frame.