Spinning Unit Airflow Isolation for Leak And Blockage Detection
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Solution Overview
Problem
Existing methods for detecting leaks and blockages in spinning units of rotor or air-jet spinning machines are inaccurate, leading to inefficiencies, increased energy consumption, and production of defective yarn due to improper compressed air flow management.
Innovation Solution
A method using a control and regulation unit to sequentially close compressed air valves, measuring differential volume flow rates, and comparing them to predefined limits to identify leaks and blockages in spinning units, with an evaluation unit providing visual or acoustic alarms for operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compressed air flow is continuously monitored at each spinning unit, then leaks and blockages can be detected, but measurement precision is insufficient leading to inaccurate detection
Solution Approach 1:
The system divides the compressed air supply network into individual segments corresponding to each spinning unit. By closing valves sequentially to isolate each spinning unit and measuring the air flow in each segment separately, the system achieves accurate detection of leaks and blockages at the individual unit level, overcoming the imprecision of previous global monitoring approaches.
Solution Approach 2:
The system performs preliminary actions by closing the compressed air valves in a defined sequence before conducting measurements. This preliminary isolation of each spinning unit ensures that subsequent measurements are not contaminated by air flow from other units, thereby improving measurement precision and detection reliability.
2Productivity
If compressed air source is designed to meet maximum required flow rate, then all spinning units can be supplied immediately, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts the compressed air supply by opening and closing valves in a defined sequence based on actual production needs. Instead of continuously supplying maximum flow, the system activates only the necessary spinning units at each moment, optimizing the balance between productivity and energy consumption.
Solution Approach 2:
The compressed air valves are operated periodically in a defined sequence, opening and closing to supply different spinning units at different times. This periodic activation pattern allows the system to maintain high overall productivity while avoiding the continuous high energy consumption associated with supplying all units simultaneously.
3Reliability
If compressed air flow is maintained above required rate to compensate for losses, then leaks can be covered, but energy consumption increases
Solution Approach 1:
The system implements feedback by measuring the compressed air flow at each spinning unit and using this information to identify leaks and blockages. This feedback mechanism allows the system to maintain air supply reliability by detecting and addressing losses at their source, rather than continuously over-supplying all units to compensate for unknown losses, thereby reducing energy waste.
4Reliability
If sequential valve closing method is used to improve detection accuracy, then detection reliability improves, but operation time increases
Solution Approach 1:
The system performs preliminary actions by closing valves in a defined sequence before measurements are taken. This preliminary isolation prepares each spinning unit for accurate measurement, ensuring detection reliability while minimizing the total time required by establishing the measurement configuration in advance.
Solution Approach 2:
The system dynamically manages the detection process by sequentially activating and isolating individual spinning units. This dynamic approach allows measurements to be conducted in an optimized sequence that improves detection reliability while minimizing the overall detection time through efficient resource allocation.
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 method allows for reliable detection of leaks and blockages, optimizing machine productivity and yarn quality by preventing defective production and reducing energy consumption.
Implementation Method 1
At least one compressed air flow meter, such as a mass flow or volume flow transmitter, serves to monitor the compressed air flow within the compressed air supply line
Implementation Method 2
The airflow is typically generated by at least one compressed air source. Depending on the type of spinning machine, this can be a suction air system, which is used, for example, in a rotor spinning machine to create a negative pressure for spinning, or a compressed air source, which is used, for example, in an air-jet spinning machine to create a positive pressure for spinning
Data Source
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AI summary
The invention relates to a method for detecting leaks and/or blockages in a spinning unit of a spinning device of a rotor or air-jet spinning machine, and to a rotor or air-jet spinning machine for carrying out the method. To provide a method for reliably detecting leaks and/or blockages in a spinning unit of a spinning device of a rotor or air-jet spinning machine, and to provide a rotor or air-jet spinning machine for carrying out this method, the method comprises the following steps: - placing the spinning machine in a test mode in which the compressed air valves are set to an "open" state, in particular an adjustable state, to allow a supply of compressed air to the spinning units, - switching on the compressed air source to supply a compressed air flow, provided that the at least one compressed air source is switched off, - closing the compressed air valves successively in a defined sequence.wherein, each time a compressed air valve closes, the prevailing compressed air flow rate is measured and the measurement result is transmitted to the evaluation unit and assigned to the at least one spinning unit associated with the compressed air valve and compared with a predetermined limit value or limit value range stored in the evaluation unit or a storage unit connected to the evaluation unit; - Identifying by the evaluation unit the spinning unit whose assigned compressed air flow rates deviate from the limit value or limit value range, whereby it is assessed whether the measured compressed air value is below or above the assigned limit value or limit value range.