Foreign Matter Separator Valve Malfunction Detection
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Solution Overview
Problem
Existing foreign part separators in spinning preparation machines face challenges in reliably detecting and separating foreign substances without causing significant fiber loss, as malfunctions in pneumatic valves can go undetected during operation, leading to inefficiencies and potential backflow of separated materials.
Innovation Solution
Incorporating a flow sensor in the compressed air line to monitor air flow disruptions, allowing for immediate detection of valve malfunctions and enabling real-time remediation, along with solenoid valves and a blower nozzle bar with individually controllable nozzles for precise air jet activation, and a vortex design in the waste chamber to prevent air backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high number of valves and long holding time are used to improve separation reliability, then foreign matter can be reliably separated, but a large amount of air is drawn into the waste chamber causing pressure increase and backflow of air into the conveying channel
Solution Approach 1:
The blow bar is divided into multiple individually controllable valve sections (e.g., 6-12 valves) arranged along the material flow direction. Each valve can be independently activated based on the detected position of foreign matter, allowing localized blowing actions rather than activating all valves simultaneously. This segmentation enables precise control of air injection, maintaining separation reliability while reducing overall air consumption and preventing excessive pressure buildup in the waste chamber.
Solution Approach 2:
The system uses periodic detection and response cycles where foreign matter is detected by sensors (e.g., optical sensors), triggering a timed sequence of valve activations. The valves are activated in a specific temporal sequence (delay time and holding time) matching the material flow speed and foreign object trajectory. This periodic, timed activation ensures foreign matter is reliably separated while limiting the duration and volume of air injection, preventing excessive pressure accumulation that would cause backflow.
2Device complexity
If valve malfunctions are not monitored during operation, then the system operates without additional monitoring complexity, but valve failures go undetected leading to high compressed air consumption and loss of sorting function
Solution Approach 1:
A feedback mechanism is implemented where the control system monitors the operational status of each valve in real-time during material flow. When a valve fails to activate or malfunctions, the system detects this through feedback signals (e.g., from position sensors or pressure sensors) and automatically adjusts the control strategy. For example, if a valve is stuck closed, the system may activate adjacent valves to compensate; if a valve is stuck open, the system reduces activation of other valves to compensate for excess air consumption. This feedback loop maintains sorting reliability without requiring complex separate monitoring systems.
Solution Approach 2:
The system performs self-diagnosis and self-adjustment during operation. The control unit continuously monitors valve performance and automatically compensates for detected malfunctions by adjusting the activation patterns of other valves. This self-service capability allows the system to maintain effective foreign matter separation even when individual valves malfunction, reducing the need for external monitoring complexity while preserving sorting function reliability.
3Reliability
If a long holding time is used to account for varying speeds of foreign particles, then all particles can be reliably hit, but more air is drawn into the waste chamber increasing pressure and causing backflow
Solution Approach 1:
Instead of applying a uniform long holding time to all valves, the system applies different activation timings and durations to different valve sections based on local conditions. Valves are activated in sequence along the material flow direction, with each valve's holding time optimized for the specific position and detected foreign object trajectory. This local quality approach ensures each foreign particle is reliably targeted by the appropriate valve at the optimal time, while minimizing the cumulative air volume injected into the waste chamber, thereby preventing excessive pressure buildup and backflow.
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
Enhances productivity by allowing for immediate detection and correction of air flow disturbances, reducing fiber loss, and ensuring reliable separation of foreign substances without re-entrainment into the conveying channel.
Implementation Method 1
a flow sensor (53) associated with the device and located inside the compressed air line (43) to detect the air flow
Implementation Method 2
the fiber material is pneumatically conveyed in a rectangular channel
Implementation Method 3
a device for generating a blowing air stream that runs in the direction of the fiber material and removes the fiber material stream with the foreign bodies completely or partially from the fiber transport channel
Implementation Method 4
at least one device for removing the foreign substances, which has a device for generating a blowing air stream... connected to a compressed air line and valves
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to an apparatus for detecting and removing foreign matter (41) in or from between fiber material, in particular cotton, during spinning preparation or ginning, comprising a fiber transport channel (2) for a fiber material flow, a sensor system (7', 7'') for detecting the foreign matter and at least one device (13) for removing the foreign matter being associated, one behind the other in the direction of transport (A), with said fiber transport channel. Said device (13) comprises a device (14) for producing a blow air flow which runs in a direction towards the fiber material flow and which entirely or partially removes the fiber material flow containing the foreign matter from the fiber transport channel (2). For the purpose of producing the blow air flow, the device (13) comprises a plurality of blow nozzles (32, 32a- 32n) which are arranged across the width of the fiber transport channel (2) and which are connected to a compressed air line (55) and to valves (36, 36a-36n). The aim of the invention is to create an apparatus of the above type which allows in a simple manner detection of a disturbance of the air flow, for example a malfunction of a valve (36, 36a-36n) directly already during operation. For this purpose, the apparatus is associated with at least one sensor (49, 53) which is designed to detect the air flow through the valves (36, 36a-36n) and/or through the blow nozzles (32, 32a-32n) and/or through the compressed air line (43) and/or the compressed air channel.