Connecting Rod Two-Level Locking Device for Hopper Car Bottom Doors
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Solution Overview
Problem
Existing two-level locking solutions for hopper cars with mechanical impact self-unloading type bottom door mechanisms are limited in adaptability and cannot reliably prevent accidental opening of bottom doors due to vibrations or other factors, leading to commodity leakage and safety issues.
Innovation Solution
A connecting rod type two-level locking device is introduced, featuring a planar four-bar linkage mechanism with a transmission shaft, door opening arms, rollers, a standstill locking disk, and a linkage mechanism, which provides a truss structure that prevents accidental opening by ensuring the linkage mechanism cannot rotate if the first roller is subjected to an upward force, using a torsion spring for additional locking force and a reserved amount to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical impact self-unloading type bottom door opening and closing mechanism is used, then the bottom door can be opened and closed conveniently for automatic unloading, but the bottom door is liable to automatically open due to vibration resulting in commodity leakage or safety issues
Solution Approach 1:
The locking device applies preliminary anti-action by using the gravity of the first roller to continuously press the locking pawl against the locking surface, creating a pre-locking force that prevents the bottom door from opening accidentally during vibration or transportation. This preliminary counteracting force ensures the bottom door remains securely locked unless intentionally opened.
2Adaptability or versatility
If a traditional two-level locking solution based on locking operation handle principle is used, then the locking mechanism can be implemented, but the adaptability is limited and cannot meet the requirements of bilaterally opening and closing the bottom doors
Solution Approach 1:
The locking device achieves universality by designing a symmetric structure where the first roller can swing between two positions to lock both the left and right bottom doors. The same locking mechanism components serve multiple functions: the first roller locks the door in the closed position, while also enabling controlled opening when swung to the other side, making the mechanism adaptable for bilateral operation without requiring separate locking systems for each door.
3Ease of operation
If the first roller is subjected to upward force during operation, then the door opening arm can move to open the bottom door, but the linkage mechanism might rotate unintentionally causing accidental opening
Solution Approach 1:
The locking pawl applies preliminary anti-action by continuously engaging with the locking surface through the pressure of the first roller's gravity, creating a pre-locking force that prevents the linkage mechanism from rotating unintentionally. This counteracting force must be overcome by intentional operation of the second roller to swing the first roller and disengage the locking pawl, ensuring the bottom door cannot open accidentally during normal operation or vibration.
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 connecting rod type two-level locking device effectively prevents accidental opening of hopper car bottom doors, ensuring reliable operation and adaptability, even under conditions of vibration, thereby enhancing safety and preventing commodity leakage.
Implementation Method 1
the first roller forms a sliding pair with the slotted hole through the first locating pin
Implementation Method 2
using a torsion spring for additional locking force
Implementation Method 3
a planar four-bar linkage passing a dead point
Implementation Method 4
the linkage locking pawl abuts against the convex teeth, and the connecting rod type two-level locking device is a truss
Data Source
AI summary
The present invention discloses a connecting rod type two-level locking device, a hopper car bottom door and a hopper car, and belongs to the technical field of rail wagons. The connecting rod type two-level locking device includes a transmission shaft, a door opening arm, a first roller, a second roller, a first locating pin, a standstill locking disk and a linkage mechanism. The hopper car bottom door includes the connecting rod type two-level locking device. The hopper car includes the bottom door. Even if the connecting rod type two-level locking device is accidentally stressed, the linkage mechanism cannot rotate, and at this time, the slave arm cannot rotate neither. The accidental opening of the hopper car bottom door can be avoided. The hopper car is more reliable to use.