Railway Switch Clamp Lock with Adjustable Preload Soleplate
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Solution Overview
Problem
The existing VCC switch mounting on a sleeper, which uses a polyamide sole to attenuate vibrations, has limited effectiveness in optimizing the life of railway tracks and reducing ballast damage, as the attenuation phenomenon is short-lived.
Innovation Solution
A VCC assembly with a sole providing a rigidity of 100-220 kN/mm, fixed to a crosspiece using a clamping device that generates a preload, allowing for adjustable compression and extended preload control, and a method for on-site replacement of the sole without full dismantling, utilizing a multilayer structure or nitrile material for stiffness and strategically positioned clamping points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyamide base plate is used to attenuate vibrations, then the attachment of the TSU to the sleeper is optimized and track lifespan is extended, but the attenuation effect is quickly limited and becomes ineffective
Solution Approach 1:
The patent changes the rigidity parameter of the base plate from a fixed polyamide material property to an adjustable system by introducing a clamping device that can generate defined preload. This allows the rigidity to be tuned within the range of 100-220 kN/mm, transforming the base plate from a passive vibration attenuator to an actively controllable mounting system that maintains effectiveness over time.
Solution Approach 2:
The invention introduces a dynamic clamping device with adjustable preload capability, transforming the static polyamide base plate into a dynamic system. The clamping device allows operators to adjust and control the preload on the base plate, enabling the mounting system to adapt to changing conditions and maintain optimal vibration attenuation throughout the service life of the track equipment.
2Reliability
If the base plate rigidity is increased to improve vibration attenuation, then the preload control is enhanced, but the replacement and maintenance of the base plate becomes more difficult
Solution Approach 1:
The patent segments the mounting system into distinct components: the base plate, the clamping device, and the cross member. This segmentation allows the base plate to be replaced independently without removing the entire VCC assembly or the clamping device, significantly simplifying maintenance operations while maintaining the required rigidity of 100-220 kN/mm for effective vibration attenuation.
Solution Approach 2:
The clamping device is designed with preliminary positioning features and a defined preload mechanism that facilitates easier removal and installation of the base plate. The strategic positioning of clamping points and the standardized interface between components prepare the system for quick maintenance operations, reducing the time and effort required for base plate replacement.
3Duration of action of moving object
If a clamping device with defined preload is used to control compression, then the attenuation phenomenon is extended, but the device complexity increases
Solution Approach 1:
The clamping device is designed to perform multiple functions: it provides mechanical fastening of the base plate to the cross member, generates defined preload for controlled compression, and enables adjustable rigidity within the 100-220 kN/mm range. By consolidating these functions into a single device, the patent avoids the need for separate components, thereby limiting the increase in overall device complexity while achieving extended vibration attenuation.
4Reliability
If the base plate is made from multilayer structure or nitrile material to achieve desired rigidity, then the vibration attenuation is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent specifies that the base plate can be made from nitrile, EPDM, or similar materials with specific rigidity characteristics, or from a multilayer structure combining polyamide with softer materials. These composite material choices provide the desired rigidity range of 100-220 kN/mm for optimal vibration attenuation while remaining manufacturable through standard rubber and polymer processing techniques.
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
This solution extends the attenuation effect of vibrations, reduces premature ballast damage, and simplifies the sole replacement process by allowing for fine adjustment and incremental preload calibration, thereby enhancing the durability and maintenance efficiency of railway tracks.
Implementation Method 1
a clamping device (7) passing through the base plate (6) adapted to generate a defined preload on the base plate (6)
Implementation Method 2
This base plate, made of polyamide, contributes to optimizing the attachment of the TSU's metal structure to the sleeper by reducing the impact of the switch on the sleeper when a train passes over it. This vibration damping during train passage thus optimizes the lifespan of the track
Data Source
Figure 1~2
AI summary
An assembly (1) formed by a structure (2) comprising a clamp lock mounted on a sleeper (5) via a soleplate (6); the soleplate (6) has a rigidity of between 180 et 200 kN/mm, and the base of the structure (2) is secured to the sleeper (5) by means of a clamping device (7) passing through the soleplate (6) and designed to generate a defined preload on the soleplate (6).