Conveyor Belt Air Stream Separation for Waste Purity
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Solution Overview
Problem
Existing material separation devices, such as those using conveyor belts, fail to achieve complete separation of material mixtures, particularly in cases of contaminated compost, where plastic and other materials are not separated in a pure form due to overlapping flows.
Innovation Solution
A device that utilizes a counterflowing air stream to accelerate and separate materials on a conveyor belt, with adjustable speed and airflow direction, allowing heavier materials to follow different parabolic paths and enabling effective separation by regulating airflow through nozzles and ducts, and using supplementary conveyor belts for further transport and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conveyor belt with a drop zone is used for material separation, then the material mixture can be transported and partially separated, but the separation is not complete and material components overlap on the conveyor belt
Solution Approach 1:
The patent introduces an air stream generated by a fan that acts on the falling material stream to separate materials by weight. The air flow creates different parabolic trajectories for materials of different densities, with lighter materials (plastic) being carried further by the air stream than heavier materials (stones, glass, metals). This pneumatic separation mechanism resolves the contradiction by achieving complete separation without requiring complex mechanical sorting systems.
Solution Approach 2:
The patent utilizes the parameter of air resistance and weight to create different flight paths for materials. By controlling the air stream velocity and angle, materials with different weight-to-air-resistance ratios follow distinct parabolic curves, enabling complete separation. The conveyor belt speed is also adjusted to optimize the separation effect while maintaining productivity.
2Manufacturing precision
If air flow is used to separate materials, then separation efficiency improves, but energy consumption increases
Solution Approach 1:
The patent employs a recirculating air stream system where air is drawn from the separation zone, filtered, and fed back to the fan for reuse. This creates a closed-loop system that minimizes energy loss by maintaining a relatively constant air pressure and flow rate, reducing the energy required to generate the air stream compared to continuous fresh air intake systems.
Solution Approach 2:
The system recovers and recycles the air stream after it has performed its separation function. The air is captured in a housing, passed through a filter to remove dust and particles, and then returned to the fan for reuse. This recovery mechanism significantly reduces energy consumption by avoiding the need to continuously generate new air streams.
3Productivity
If the conveyor belt speed is increased to improve separation, then materials can be better distributed, but the separation precision may be compromised
Solution Approach 1:
The patent employs variable speed control of the conveyor belt and fan, allowing dynamic adjustment of the separation process. The speeds can be optimized for different material compositions and contamination levels, enabling the system to maintain high separation precision while adapting to different productivity requirements. This dynamic control resolves the contradiction by allowing both parameters to be optimized based on real-time conditions.
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 allows for efficient and energy-saving separation of materials by weight, even in contaminated compost, with adjustable airflow ensuring precise separation of materials with similar air resistance, and reduces the need for additional air treatment systems.
Implementation Method 1
Lighter materials, such as plastic films, are slowed down first, aided by the blower, while heavier materials, such as stones, glass, and metals, travel the furthest
Implementation Method 2
If the conveyor belt has a sufficiently high transport speed, the material mixture in the interruption zone essentially falls along a predetermined parabolic curve
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a device (1) for separating a material mixture (2), in particular waste material, in particular plastic and/or bio-waste, comprising a treadmill (3), which has an adjustable inclination in particular, for transporting at least one part of the material mixture (2) in a transport direction (4). The material mixture (2) is deposited on the treadmill (3) substantially in an evenly distributed manner in particular in a transport width (5). The device also comprises a fall region (6) for generating a falling stream (7) of the material mixture (2) for the material mixture (2) transported on the treadmill (3) in a transport direction (4) at an interruption region (8) of the treadmill (3). In particular, the treadmill (3) has an adapted transport speed such that the material mixture falls substantially in a specified parabolic curve in the interruption region (8). The device also comprises an air flow means (9) for generating an air flow (10), in particular a directed air flow, in particular with an adjustable flow angle (11), and the air flow means (9) is oriented substantially opposite the transport direction (4) of the material mixture (2) towards the at least partially free-falling material stream (7).