Foaming Ballast Bed Reactive Plastic Injection
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Solution Overview
Problem
Existing methods for injecting reactive plastic into ballast frameworks to enhance stability against track forces often clog and require solvent rinsing, leading to inefficiencies and environmental concerns.
Innovation Solution
A method using a high-pressure mixing head to meter and mix reactive components, applying the liquid mixture in a free-flowing manner to the ballast structure, allowing it to foam and rise, with a controlled start time to prevent clogging and minimize raw material loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive plastic is injected into ballast framework using traditional injection methods, then ballast stability is improved, but the injection device clogs and requires solvent rinsing
Solution Approach 1:
The reactive plastic is applied in liquid form before foaming occurs, allowing it to flow through the ballast framework cavities in advance. The foaming process is then initiated separately, causing the material to expand and rise into position without clogging the injection device.
Solution Approach 2:
The reactive plastic undergoes a phase transition from liquid to foam during the process. It is applied as liquid that flows through the framework, then undergoes chemical foaming that transforms it into expanding foam, which rises into the cavities and stabilizes the ballast stones.
2Reliability
If reactive plastic is injected into ballast framework using traditional injection methods, then ballast stability is improved, but raw material loss occurs
Solution Approach 1:
The liquid reactive plastic is applied in advance to the ballast framework, allowing it to penetrate and distribute through the cavities before foaming. This preliminary application ensures complete coverage and prevents material loss that would occur with traditional injection methods.
Solution Approach 2:
The foaming process itself serves to deliver the reactive plastic into the cavities. As the liquid foam generates gas bubbles and expands, it automatically rises into the ballast framework cavities, eliminating the need for separate injection devices and preventing raw material loss.
3Duration of action of stationary object
If reactive plastic is applied to stabilize ballast stones, then service life is extended, but environmental pollution occurs due to solvent rinsing
Solution Approach 1:
The harmful solvent rinsing step is completely removed from the process. The reactive plastic is applied as liquid that foams in situ, eliminating the need for solvents to clean the equipment or environment, thus removing the source of environmental pollution.
Solution Approach 2:
The liquid-to-foam phase transition occurs directly in the ballast framework without requiring solvent rinsing. The foaming process itself completes the application and stabilization function, eliminating the need for environmentally harmful cleaning solvents.
4Reliability
If traditional injection methods are used for reactive plastic, then ballast stability is improved, but cleaning time and equipment complexity increase
Solution Approach 1:
The system is self-cleaning by design. The liquid reactive plastic flows through the application device, foams in the ballast framework, and the foam expansion automatically clears any residual material from the equipment, eliminating the need for manual cleaning and saving time.
Solution Approach 2:
The foaming process serves dual purposes: it stabilizes the ballast stones and simultaneously cleans the application equipment. The expanding foam acts as a self-cleaning mechanism that removes residual plastic from the device without requiring separate cleaning operations.
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 approach ensures a clean and efficient foaming process that stabilizes ballast stones without raw material loss, enhancing the service life of ballast beds while being environmentally friendly.
Implementation Method 1
the reactive components are metered to at least one high-pressure mixing head and mixed there
Implementation Method 2
the liquid discharged from the high-pressure mixing head is applied in a free-flowing manner to the surface of the ballast structure
Implementation Method 3
the reactive mixture is then foamed and thereby allowed to rise
Implementation Method 4
foaming the cavities in the ballast framework of a ballast bed with reactive plastic... to prevent the ballast stones from twisting and shifting
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a method and device for partially or completely foaming the hollow spaces in the ballast structure of a ballast bed, below which a subgrade (7) is located, having a reactive plastic, wherein the reactive components are mixed in a high-pressure mixer (1,26) and wherein the start time for the reactive mixture (4) is adjusted such that the foaming process substantially only begins when the reactive mixture has reached the subgrade (7).