Railway Closure Detector Contact System With Snap-Action Mechanism
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Solution Overview
Problem
Existing closure detectors for railway signal detection have complex structures, leading to large size, high manufacturing and maintenance costs, and poor seismic performance.
Innovation Solution
A contact system with a simplified structure comprising a base, drive spindle, swing link, operating plate, snap plate, movable contacts, and fixed contacts, where the operating plate and snap plate are connected to the drive spindle via splines, and the movable contacts are mounted on a movable contact block with a connecting shaft, enabling rapid and accurate switching between closure and separation positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two sets of movable contacts, two sets of fixed contacts, rocker slot, nail, slider structures are used to achieve contact or disengagement, then the contact switching function is realized, but the overall structure becomes extremely complicated
Solution Approach 1:
The patent merges multiple separate contact components (movable contacts, fixed contacts, rocker slot, nail, slider) into a unified contact assembly where the operating plate integrates the functions of multiple previous components. The snap plate and operating plate work together as an integrated mechanism, eliminating the need for separate rocker slots, nails, and sliders while maintaining the contact switching function.
Solution Approach 2:
The operating plate serves multiple functions simultaneously: it acts as a connection element between the drive spindle and movable contacts, provides the contact surface for making/breaking electrical connections, and incorporates the snap-action mechanism through its interaction with the snap plate. This multi-functionality reduces the overall component count and structural complexity.
2Reliability
If complex structure equipment is used, then contact switching can be achieved, but high cost is incurred on manufacturing, installation and routine maintenance
Solution Approach 1:
By combining multiple functions into fewer components (the operating plate integrates connection, contact, and actuation functions), the patent reduces the total number of parts that need to be manufactured, assembled, and maintained. This directly lowers manufacturing costs and simplifies installation procedures while maintaining reliable contact switching capability.
3Reliability
If traditional closure detector structure is used, then contact detection is achieved, but large size is resulted
Solution Approach 1:
The patent employs a nested arrangement where the movable contacts are positioned within the space defined by the fixed contacts and base structure. The snap plate is disposed around the upper end of the drive spindle, and the operating plate is placed between the snap plate and base, creating a compact nested configuration that minimizes the overall volume of the closure detector while maintaining full detection functionality.
Data Source
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AI summary
A contact system employs a swing link (1) to drive set of movable contacts (5) to engage with a left or right set of contacts (24, 25) respectively on two sides thereof, so as to achieve indication of a detachment or close attachment position. Particularly, a drive shaft (2) along with an operating plate (3) and a snap plate (4) on the drive shaft (2) are driven by the swing link (1) to change a motion trajectory of a roller (10) on a movable contact shaft (12), aided by action of a snap-action claw (11) and a tension spring (9), thereby achieving, quick action of set of movable contacts (5), and realizing a contact with or disconnection from set of fixed contacts (6) to achieve indication of the separation or in closure position. The system has a simple structure and a small size, responds quickly and accurately, and is cheap to manufacture, install, and maintain.