Vacuum Control for Open-End Rotor Spinning Machines
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Solution Overview
Problem
Open-end rotor spinning machines face inefficiencies due to constant negative pressure application across all work stations, limiting the number of simultaneous spinning positions and increasing energy consumption, especially during machine restarts or power failures.
Innovation Solution
Implementing a method where negative pressure is applied only to spinning devices that are actively producing yarn or restarting, with the central control unit regulating vacuum supply in groups or sections, and using solenoid valves to manage pressure distribution, allowing for demand-adapted vacuum consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If negative pressure is applied to all work stations continuously, then fiber transport and yarn production are maintained, but energy consumption increases and the number of simultaneous spinning positions is limited
Solution Approach 1:
The patent applies dynamic control by switching the negative pressure supply on and off for different work stations based on their operational state. The control unit monitors whether each work station is in spinning mode or piecing mode and dynamically adjusts the vacuum supply accordingly, allowing the system to adapt to changing production requirements and maximize the number of simultaneous spinning positions while managing energy consumption
Solution Approach 2:
The patent segments the work stations into different groups based on their operational requirements. The control unit can divide work stations into those requiring negative pressure (spinning mode) and those that don't (piecing mode or idle), allowing independent control of vacuum supply to each segment. This segmentation enables more work stations to operate simultaneously by ensuring sufficient vacuum pressure is available for active spinning positions
2Productivity
If negative pressure is applied to all work stations, then yarn production is maintained, but vacuum pressure is insufficient when multiple positions need to start simultaneously
Solution Approach 1:
The control unit dynamically adjusts the negative pressure supply based on real-time operational needs. When multiple work stations need to start simultaneously, the system activates negative pressure supply to those specific stations, ensuring sufficient vacuum pressure is available where needed. This dynamic allocation prevents vacuum pressure depletion that would occur with static continuous supply to all stations
Solution Approach 2:
The patent applies local quality by providing negative pressure selectively to specific work stations based on their individual operational state rather than uniformly to all stations. Work stations in spinning mode receive negative pressure while those in piecing mode or idle do not, ensuring that vacuum pressure is concentrated where it is needed to maintain adequate pressure levels for simultaneous startups
3Ease of operation
If negative pressure is applied during piecing, then fiber flow continues normally, but piecing quality deteriorates due to fiber suction through the opening roller
Solution Approach 1:
The control unit dynamically switches the negative pressure supply based on the operational mode of each work station. During piecing operations, the control unit deactivates negative pressure supply to allow the thread end to be fed through the opening roller without fiber suction interference. Once piecing is complete and spinning mode is restored, negative pressure is reactivated to maintain normal fiber flow and spinning continuity
Solution Approach 2:
The patent applies periodic action by temporarily interrupting negative pressure supply during the piecing phase and then restoring it during the spinning phase. This periodic switching of vacuum supply aligns with the cyclic nature of piecing operations, ensuring that negative pressure is applied only when needed for fiber transport and not during piecing when it would interfere with thread end feeding
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 approach enables more efficient operation by allowing more spinning positions to start simultaneously, reducing energy consumption, and optimizing vacuum usage, leading to faster machine startup and cost savings without affecting yarn quality.
Implementation Method 1
a rotor housing that can be subjected to negative pressure and in which a spinning rotor rotates at high speed
Implementation Method 2
which generates an air flow in the fiber guide channel, loosens the fibers from the opening assembly and conveys them through the so-called channel plate adapter into the spinning rotor
Implementation Method 3
The centrifugal acceleration causes the fibers to slip into the collecting groove of the spinning rotor
Implementation Method 4
the end of the thread is fed into the thread take-off tube of the spinning chamber in the opposite direction to the yarn take-off direction and sucked in by the negative pressure in the rotor housing
Data Source
AI summary
The invention relates to a method for operating an open-end rotor spinning machine (1) comprising a plurality of workstations (4), each of which has a spinning device (5) with a vacuum-operated rotor housing (21) in which a spinning rotor (23) rotates at high speed for producing a yarn (16) and a winding device (7) for producing a cross-wound bobbin (18), wherein the connection of the workstations to a central vacuum supply can be switched off. According to the invention, the application of vacuum to the rotor housing is limited to the spinning devices that produce yarn and the spinning devices that start spinning again.