Road Paver Suction Device for Bitumen Vapor Extraction
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Solution Overview
Problem
Existing road finisher suction systems are inadequate in minimizing harmful asphalt vapors, such as hydrocarbons and bitumen fumes, posing health hazards to operators and requiring high maintenance and space occupation.
Innovation Solution
A road finisher with a suction device featuring a confusor-like inlet nozzle above the transverse distributor, which provides enhanced suction performance by directing suction flow uniformly across the screed, and an optional air flushing system to shield rising vapors, allowing for easy retrofitting and minimal weight increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a suction system with air ducts and fans is installed on the paver structure, then harmful vapors can be removed, but the cleaning and maintenance effort due to deposits in the air duct system becomes high
Solution Approach 1:
The suction device is extracted from the paver structure and mounted on the screed instead. This separates the vapor extraction function from the main machine structure, allowing the suction device to be easily removed for cleaning without disassembling integrated air ducts. The confusor-like inlet connection is directly attached to the screed, enabling straightforward access for maintenance.
Solution Approach 2:
The suction device is designed as a separate, modular unit with the confusor-like inlet connection that can be detached from the screed. This segmentation allows the suction component to be independently removed for cleaning, reducing maintenance effort compared to integrated air duct systems that require extensive disassembly.
2Object-affected harmful factors
If a suction system with integrated air ducts is installed on the paver structure, then harmful vapors can be removed, but space is occupied in the paver
Solution Approach 1:
The suction device is extracted from the paver structure and mounted on the screed instead. This relocates the space requirement from the paver's main body to the screed assembly, freeing up space within the paver structure while maintaining vapor extraction functionality.
3Device complexity
If a short suction funnel is positioned above the transverse distributor, then the structure is simple, but the suction performance is insufficient
Solution Approach 1:
The confusor-like inlet connection is designed to move with the screed, maintaining its position relative to the transverse distributor as the screed adjusts. This dynamic positioning ensures consistent suction performance throughout operation while keeping the overall structure relatively simple compared to fixed, complex ducting systems.
Solution Approach 2:
The confusor-like inlet connection incorporates a diffuser geometry that gradually expands the flow area, transforming the velocity distribution and pressure fields to optimize suction performance. This geometric parameter optimization enhances vapor capture efficiency without requiring a complex overall structure.
4Object-affected harmful factors
If the suction inlet is positioned above the transverse distributor, then vapors can be extracted, but the view of the transverse distributor from the driver's cab is obscured
Solution Approach 1:
The suction device is positioned on the screed in a location that utilizes three-dimensional space effectively, placing the inlet connection above the transverse distributor for vapor extraction while positioning the main body of the suction device below the platform level. This spatial arrangement in multiple dimensions allows vapor extraction functionality while maintaining an unobstructed view from the driver's cab.
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 solution effectively reduces the amount of bitumen fumes affecting operators, is inexpensive to build and maintain, and does not obstruct the view or accessibility, while being easily transportable and adjustable for optimal performance.
Implementation Method 1
a suction device (10) with a confusor-like inlet nozzle (8) above the transverse distributor (7)
Implementation Method 2
for directing suction flow uniformly across the screed
Implementation Method 3
an optional air flushing system to shield rising vapors
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a road paver comprising a chassis (2) that carries a driver's cab (1), an undercarriage (3), at least one drive assembly (4), a hydraulic system, a cover (5) mounted in an articulated manner, an asphalt feed arrangement comprising a storage hopper (6), a longitudinal conveyor device which conveys material from the storage hopper (6) to a cross-distributor (7), and a steam suction system (10) which is operated by means of a vacuum generator and comprises at least one suction flow path whose withdrawal line (11) comprises a suction inlet above the cross-distributor (7) and an outlet at a height above the driver's cab (1). At the suction inlet-side end of said withdrawal line (11), at least one confuser-like inlet nozzle (8) is provided which is arranged to be secured to, and movable with, said cover (5), and which aspirates behind the cross-distributor (7) in the travel direction (F) such that accessibility in the region above the cross-distributor (7) is not affected and the view out to the cross-distributor (7) from the driver's cab is not obscured.