Control Valve for Railroad Car Door Position Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In hydraulic or pneumatic systems used for railroad car door control, there is a risk of inadvertent door opening due to accidental or intentional activation of the movable element, leading to coal being unloaded prematurely, as air pressure can flow before the car reaches the unloading area, necessitating a solution to prevent piston movement until a predetermined position is reached.
Innovation Solution
A control valve with a locking mechanism that prevents piston movement until a solenoid activator is triggered at a specific position along the railroad tracks, ensuring air pressure is only applied when the car is over the unloading area, utilizing interlock elements and solenoids to manage fluid pressure and prevent unintended door operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air pressure is supplied to the movable element to enable door opening, then the doors can be opened for coal unloading, but the doors may open prematurely before the railroad car reaches the unloading area
Solution Approach 1:
The control valve is positioned and configured so that air pressure can only be supplied to the movable element when the railroad car reaches the predetermined unloading area. The valve body and movable element are arranged to ensure that the control action (door opening) occurs only after the railroad car has arrived at the correct location, preventing premature opening while maintaining productivity
Solution Approach 2:
The control valve acts as an intermediary device between the air pressure source and the movable element. It controls and regulates the supply of air pressure, ensuring that pressure is only transmitted to the movable element when the railroad car is at the predetermined position, thus mediating between the conflicting requirements of door opening capability and premature opening prevention
2Ease of operation
If the movable element is made accessible for manual operation, then door control is flexible, but inadvertent activation can occur causing premature door opening
Solution Approach 1:
The control valve serves as an intermediary between the manual operation mechanism and the movable element. Even when manually operated, the valve controls the air pressure supply path, ensuring that manual activation only results in door opening when the railroad car is at the predetermined unloading area, thus maintaining ease of operation while preventing inadvertent activation
Solution Approach 2:
The control function is extracted and separated from the movable element itself, placing it in the control valve body. This separation allows manual operation to be performed on the valve while the actual door opening action is controlled by the valve's position relative to the railroad car, reducing the risk of inadvertent activation
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
Ensures that doors only open and close when the railroad car is at the correct position, preventing coal from being unloaded prematurely and maintaining safety and efficiency in the unloading process.
Implementation Method 1
a solenoid activator (17) that is activated when each railroad car is at a first predetermined position along a predetermined path, which is defined by the railroad tracks. This results in movement of a plunger (93) of the solenoid (17)
Implementation Method 2
fluid pressure acting on at least one of opposite ends of the movable element. An interlock element is supported by the housing and is movable substantially perpendicular to the axis along which the movable element moves
Data Source
AI summary
Pivotally mounted doors forming the floor of a railroad car are prevented from opening inadvertently through not allowing fluid pressure to be applied to a door opening piston until the fluid pressure exceeds a predetermined amount. A control valve can control the position of a spool.