Textile Machine Vacuum System Sub-Negative Pressure Control
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Solution Overview
Problem
Textile machines with multiple workstations face challenges in maintaining sufficient negative pressure, especially after interruptions, due to limited suction force in the vacuum system, leading to prolonged downtime and reduced production capacity.
Innovation Solution
A method that sets a sub-negative pressure level below the minimum required pressure, allowing a larger number of workstations to receive additional negative pressure simultaneously by limiting the number of workstations supplied during events like machine stoppages or lot changes, utilizing a control unit to manage and adjust the negative pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the vacuum system supplies additional negative pressure to multiple workstations simultaneously after a machine stoppage, then the ramp-up time is reduced, but the minimum negative pressure required for regular production operation falls below the minimum level
Solution Approach 1:
The patent changes the pressure parameter by introducing a sub-negative pressure level that is below the minimum negative pressure. This allows the system to temporarily operate at lower pressure levels during ramp-up operations, enabling more workstations to receive additional negative pressure simultaneously without compromising the reliability of regular production operations.
Solution Approach 2:
The patent implements dynamic pressure management where the vacuum system can switch between different pressure levels (minimum negative pressure for regular operation and sub-negative pressure for ramp-up operations). The control unit dynamically adjusts the number of workstations receiving additional negative pressure based on the current operational state, allowing the system to adapt to different production phases.
2Power
If the drive motor of the vacuum unit runs at maximum speed to increase negative pressure level, then the suction force is maximized, but the system cannot provide sufficient negative pressure to all workstations requiring additional negative pressure simultaneously
Solution Approach 1:
The patent changes the pressure parameter by introducing a sub-negative pressure level that is below the minimum negative pressure. This allows the system to temporarily operate at lower pressure levels during ramp-up operations, enabling more workstations to receive additional negative pressure simultaneously without compromising the reliability of regular production operations.
Solution Approach 2:
The patent applies partial action by selectively supplying additional negative pressure to a limited number of workstations at a time. The control unit manages which workstations receive additional pressure based on the current system state, allowing the vacuum system to operate at maximum power for specific workstations rather than attempting to serve all workstations simultaneously.
3Manufacturing precision
If the number of workstations supplied with additional negative pressure is limited to maintain minimum pressure level, then production quality is maintained, but the time to resume full production capacity increases significantly
Solution Approach 1:
The patent changes the pressure parameter by introducing a sub-negative pressure level that is below the minimum negative pressure. This allows the system to temporarily operate at lower pressure levels during ramp-up operations, enabling more workstations to receive additional negative pressure simultaneously without compromising the reliability of regular production operations.
Solution Approach 2:
The patent implements periodic action by alternating between different operational phases: regular production operation at minimum negative pressure and ramp-up operations at sub-negative pressure. The control unit manages this periodic switching, allowing the system to maintain quality during regular operation while enabling faster production resumption during ramp-up phases.
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 significantly reduces ramp-up time and increases the number of workstations that can be supplied with additional negative pressure, ensuring minimal impact on quality and enabling faster resumption of production, particularly in scenarios like electricity disruptions or lot changes.
Implementation Method 1
a vacuum system with limited suction force to exert the negative pressure on the workstations
Implementation Method 2
constant negative spinning pressure is required to operate the workstations of open-ended rotor spinning machines
Data Source
AI summary
A method for operating a textile machine with several identical workstations which each have a basic requirement for negative pressure for regular production operation and an additional requirement for negative pressure following an interruption to production at the workstation, and with a vacuum system with limited suction force to exert the negative pressure on the workstations. A minimum negative pressure (pmin) is set and the number workstations simultaneously supplied with additional negative pressure is limited so that the minimum negative pressure (pmin) is always met. In accordance with the invention, a sub-negative pressure (psub) is specified which is below the minimum negative pressure (pmin) and, if a specified event occurs, the number of workstations simultaneously supplied with additional negative pressure is temporarily limited so that the sub-negative pressure (psub) is always met.