Bitumen Welding Machine Tool-Free Pressure Roll Exchange
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Solution Overview
Problem
Welding machines used for joining bitumen webs face frequent interruptions due to the soiling of pressure rolls, requiring time-consuming manual cleaning, which affects the quality and continuity of the welding process.
Innovation Solution
A welding machine design that includes a second exchangeable pressure roll without the need for tools, allowing quick replacement and maintaining contact pressure, combined with a metallic pressure roll and a stripper element for efficient cleaning during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure roll is used for welding bitumen webs, then good welding quality is achieved through high contact pressure, but the pressure roll becomes heavily soiled by liquid bitumen requiring frequent manual cleaning
Solution Approach 1:
The pressure roll is segmented into a roll body and a separately exchangeable contact surface. The contact surface can be removed and replaced without tools when soiled by bitumen, allowing quick maintenance while preserving the roll body. This segmentation enables the contact surface to be cleaned or replaced independently, solving the problem of frequent manual cleaning interruptions.
Solution Approach 2:
The contact surface is designed as a consumable component that can be discarded when heavily soiled and replaced with a fresh one. The roll body is recovered and reused, maintaining its structural integrity and weight function. This approach allows rapid replacement of the soiled contact surface without discarding the entire pressure roll assembly.
2Reliability
If manual cleaning of the pressure roll is performed frequently, then welding quality is maintained, but the welding process is interrupted for lengthy periods
Solution Approach 1:
By segmenting the pressure roll into an exchangeable contact surface and a permanent roll body, the cleaning operation is transformed into a rapid surface replacement task. This reduces the time required from lengthy manual cleaning to a quick tool-free exchange, maintaining welding quality while minimizing production interruptions.
Solution Approach 2:
The system enables operators to perform maintenance themselves without requiring specialized cleaning equipment or extensive training. The contact surface can be removed and replaced by the operator directly at the welding position, eliminating the need for separate cleaning stations or prolonged downtime.
3Stress or pressure
If a silicone pressure roll is used to respond elastically to forces, then good contact pressure distribution is achieved, but the roll surface becomes unevenly soiled by plasticized bitumen
Solution Approach 1:
The silicone roll body providing elastic pressure distribution is segmented from the contact surface. The silicone properties are retained in the roll body for optimal pressure distribution, while the contact surface is made of a different material that resists bitumen adhesion. This segmentation allows each component to have optimized properties for its specific function.
Solution Approach 2:
The pressure roll assembly becomes a composite structure combining silicone (for elastic pressure distribution) with a bitumen-resistant contact surface material. This composite approach allows the system to simultaneously achieve good contact pressure distribution and resistance to surface contamination by bitumen.
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
Enables continuous operation with increased contact pressure and stable position, reducing the need for manual cleaning and minimizing interruptions in the welding process.
Implementation Method 1
a heating system for local heating of the webs of sealing material
Implementation Method 2
at least one pressure roll installed on the chassis for pressing together the webs of sealing material to be joined by means of heat
Data Source
AI summary
A welding machine for joining overlapping webs of sealing material, with a powered chassis supported by rolls, with a heating system for local heating of the webs of sealing material that is mounted laterally to the chassis (4) and can be placed between the webs of sealing material in edge regions, with at least a first pressure roll installed on the chassis for pressing together the webs of sealing material to be joined by means of heat, where a second pressure roll serving as a replacement pressure roll is placed in the chassis, whose weight rests on the drive shaft and which can be exchanged without tools for the first pressure roll that is coupled to the drive shaft of the welding machine and presses together the bitumen webs to be joined. In addition, the pressure roll (3) may have at least one contact surface made of hard metallic material; and a stripper element is provided whose free end contacts the contact surface or is in close proximity to the same. Therefore, even with materials to be welded that will contaminate the pressure roll, the welding machine is capable of operating for long periods.