Under-floor Lifting Jack for EMU Train Maintenance
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Solution Overview
Problem
Existing under-floor lifting jacks (UFLJs) are not compatible with various types of electric multiple unit (EMU) trains, as they are designed for specific train types, leading to inefficiencies and waste in maintenance facilities that need to service multiple EMU train types.
Innovation Solution
A UFLJ system with adjustable bogie lifting means and body hoists, controlled by a main electric control unit, allowing for synchronized lifting and precise positioning of different EMU train types, featuring multiple bogie lifting means and a laser distance-measuring device for accurate alignment and lifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a UFLJ is designed for a single type of EMU train, then the lifting precision and positioning accuracy are improved, but the adaptability to different EMU train types deteriorates
Solution Approach 1:
The bogie lifting means are designed with adjustable positioning capabilities, allowing the lifting points to be dynamically repositioned along the longitudinal direction to accommodate different bogie positions of various EMU train types. The body hoists are also movable along dedicated rails, enabling dynamic adjustment of lifting positions. This dynamic configurability maintains high positioning accuracy while achieving compatibility across multiple train types.
Solution Approach 2:
The system allows changing of key parameters including the positioning of bogie lifting means, the number of pits, and the configuration of body hoists based on the specific requirements of different EMU train types. By adjusting these parameters, the system maintains precise lifting control while adapting to various train dimensions and bogie positions.
2Adaptability or versatility
If multiple types of UFLJ are constructed to match different EMU train types, then the adaptability is improved, but the device complexity and construction cost increase
Solution Approach 1:
The UFLJ system is designed as a universal platform that can service all four types of EMU trains (CRH1, CRH2, CRH3, and CRH5) through configurable adjustments. Instead of requiring separate dedicated systems for each train type, a single multi-functional UFLJ with adjustable parameters achieves compatibility across all types, significantly reducing the number of systems needed from multiple specialized units to one universal system.
Solution Approach 2:
The system is divided into independently adjustable modules including multiple bogie lifting means that can be independently positioned, separate body hoist units that move along rails, and configurable pit arrangements. This modular segmentation allows each component to be adjusted according to the specific requirements of different EMU train types, enabling one system to replace multiple specialized systems.
3Ease of manufacture
If the distances between adjacent pits and lengths of bogie lifting means are fixed, then the manufacturing simplicity is improved, but the adaptability to different EMU train dimensions deteriorates
Solution Approach 1:
While maintaining standardized fixed distances between pits for structural simplicity, the system incorporates movable and adjustable components within those fixed frameworks. The body hoists move along dedicated rails between fixed pit positions, and the bogie lifting means can be repositioned within their spans, allowing the standardized structure to adapt to different train dimensions without requiring complete redesign of the pit layout.
Data Source
AI summary
The invention discloses an under-floor lifting jack for high-speed EMU train, comprising: a main control electric part for controlling the jack, multiple bogie lifting means arranged in pits, fixed rails on the ground between adjacent pits, and body hoists movable along dedicated rails on both sides of the bogie lifting means, wherein lifting rails of the bogie lifting means and the fixed rails form continuous rails, and one or more of the bogie lifting means are set in each pit and adapted for lifting individually or synchronously in combination according to the wheel positions of different types of electric multiple unit trains under the control of the main control electric part. The invention is compatible with the maintenance of various EMU trains, thus the same lifting jack can satisfy maintenance requirements of various EMU trains, resulting in high compatibility and construction cost-reduction of the maintenance base for the EMU train.