Screening Box Explosion Protection via Integrated Anti-Propagation Device
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Solution Overview
Problem
Existing screening machines for potentially explosive dusts, such as small wood shavings, face issues with bulk, complexity, and maintenance due to external chemical suppressor systems and flexible pipes, which are prone to fatigue and limited reliability.
Innovation Solution
Integration of an active anti-propagation device within the screening box, featuring pipes with delivery nozzles and chemical suppressors attached directly to the walls, ensuring comprehensive coverage and reduced maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical suppressors are positioned on supports outside the screening box and connected by flexible pipes, then explosion protection is provided, but the bulk and complexity of the screening machine increase
Solution Approach 1:
The chemical suppressors and piping system are merged with the screening box structure itself. The suppressors are mounted directly on the box walls and the pipes are integrated into the box framework, eliminating external supports and reducing overall system complexity while maintaining explosion protection functionality
Solution Approach 2:
The screening box structure serves multiple functions: it contains the screening compartments and simultaneously serves as the mounting structure for the explosion protection system. The walls and framework of the box are utilized to support suppressors and route pipes, making the structure multi-functional and reducing the need for separate protection system components
2Reliability
If flexible pipes are used to connect external chemical suppressors to the screening box, then explosion protection is achieved, but the pipes are subjected to fatigue from oscillation movements and require frequent replacement
Solution Approach 1:
The piping system is merged with the rigid screening box structure rather than being external and flexible. The pipes are mounted directly to the box walls and framework, which provides stable support that eliminates fatigue from oscillation movements, significantly extending pipe durability and reducing maintenance requirements
Solution Approach 2:
The rigid box structure serves as a stable foundation that cushions and absorbs the oscillation movements before they can affect the piping system. By anchoring pipes to the box structure at multiple points, the system pre-compensates for vibration effects, preventing fatigue accumulation in the pipes
3Productivity
If the screening box has a length of up to ten meters or more with multiple compartments, then screening capacity is increased, but covering the entire volume with extinguishing jets becomes more difficult
Solution Approach 1:
The screening box is divided into multiple compartments, and the explosion protection system is correspondingly segmented with suppressors and piping distributed throughout each compartment. This segmentation ensures that extinguishing agents can be delivered effectively to each section, maintaining reliable coverage across the entire extended length of the screening machine
Solution Approach 2:
The explosion protection system is tailored to each local compartment with appropriately positioned suppressors and piping configurations. Each compartment receives customized protection based on its specific geometry and dust accumulation characteristics, ensuring effective extinguishing coverage throughout the entire screening box volume
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 provides reliable and safe protection against explosive atmospheres with reduced bulk and complexity, ensuring effective extinguishing coverage of the entire screening box volume, enhancing maintenance efficiency and reliability.
Implementation Method 1
at least one pipe (28) provided with a plurality of delivery nozzles (29) for delivering an extinguishing chemical substance in fluidic communication with one or more compartments (23) of the screening box (12)
Data Source
AI summary
Screening machine (10) for screening solid materials, comprising a screening box (12) shaped so as to have a plurality of perimeter walls (16, 17, 19, 21), an upper wall (15) and an opposite bottom wall (13), in order to make said solid materials to be screened flow inside it. Said screening machine (10) comprises at least one active anti-propagation device (24) integral with said screening box (12).