Hopper Wagon Inlet Closure Linkage Mechanism
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Solution Overview
Problem
Existing inlet closure systems for covered hopper wagons face issues where piston rods project above the end walls when fully open, impeding access and being vulnerable to damage during loading, as they conflict with loading chutes and commodities.
Innovation Solution
The design incorporates a linkage system with a second link that forms a non-straight angle, keeping the piston rod below the upper edge throughout the closure member's movement, and a common pivot point on an upright structural support, eliminating the need for additional sub-frames and reducing obstruction and damage risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If piston rods are used to actuate doors in a conventional configuration, then the doors can be moved between open and closed configurations, but the piston rods project above the end walls and impede access to the inlet during loading
Solution Approach 1:
The patent changes the spatial arrangement by introducing a linkage mechanism that redirects the piston rod's motion path. The linkage comprises first and second links pivotally connected, where the first link connects to the piston rod and the second link connects to the door, allowing the actuation force to be transmitted without the piston rod projecting above the end wall during door opening.
Solution Approach 2:
The linkage acts as an intermediary mechanism between the piston rod and the door. Instead of the piston rod directly acting on the door (which would cause obstruction), the linkage mediates this connection, transmitting the actuating force through a path that remains below the end wall while still achieving the desired door motion.
2Ease of operation
If piston rods are exposed above the end walls, then door actuation is achieved, but the piston rods become vulnerable to damage from contact with loading chutes and bulk commodity material
Solution Approach 1:
The linkage serves as a protective intermediary that shields the piston rod from direct exposure to damaging elements. By routing the actuation force through the linkage mechanism below the end wall, the piston rod remains protected from contact with loading chutes and bulk material, eliminating the vulnerability while maintaining actuation functionality.
Solution Approach 2:
The patent extracts the vulnerable portion of the actuation system (the exposed piston rod) from the operating environment. By using the linkage to transmit force, the actual piston rod is taken out of the hazardous zone above the end wall, leaving only the necessary actuation function while removing the vulnerable component from the damage-prone area.
3Reliability
If a simple removable sheet cover is used, then the inlet can be protected, but the sheet must be stored when not in use and manual operation is required
Solution Approach 1:
The patent merges the protection function with an automated actuation system. Instead of using a simple removable sheet that requires manual handling and storage, the invention integrates the door closure with automatic actuation mechanisms, combining the protective function with automated operation to eliminate the need for separate storage and manual intervention.
4Reliability
If doors are arranged as an opposing pair rotating about horizontal axes, then the inlet can be substantially covered when closed, but the piston rods conflict with loading chutes during loading
Solution Approach 1:
The patent resolves the spatial conflict by changing the dimension in which the actuation mechanism operates. The linkage mechanism allows the door to rotate about a horizontal axis (maintaining inlet coverage) while the force transmission path is redirected below the end wall, eliminating the conflict with loading chutes that would occur with direct piston rod actuation.
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
The invention relates to an inlet closure system for covering an inlet (I) formed in an upper region of a container body (12). The container body may a storage region of a hopper, a hopper vehicle (10) such as a hopper railway wagon or other storage devices. The inlet closure system comprises at least one closure member (14a, 14b) arranged substantially above the inlet and moveable between a first closed configuration in which the inlet is substantially closed and a second fully open configuration in which the inlet is substantially open, and at least one actuator (18a, 18b) mounted on an end wall (12b) of the container body for moving the closure member. The actuator remains below an upper edge (12be) of the end wall when the closure member is in the second fully open configuration.