Textile Carding Drum Gap Control Through Electrical Contact Detection
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Solution Overview
Problem
Current methods for calibrating the carding gap in carding machines are inaccurate and prone to measurement uncertainties, leading to potential collisions between components due to temperature changes and operational imbalances, which affect yarn quality and machine safety.
Innovation Solution
A method for automatically adjusting and maintaining a defined distance between a rotatably mounted drum and other components using electrical insulation and contact detection, allowing for precise calibration with reference values stored in the machine control system, and actuator control to maintain optimal distances despite temperature and operational changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration with feeler gauge is used, then the carding gap can be adjusted, but measurement precision and reliability are poor due to human error and temperature changes
Solution Approach 1:
The patent replaces the manual mechanical feeler gauge measurement system with an electrical measurement system. Electrical measuring devices with probes contact the drum and component surfaces to automatically measure the carding gap, eliminating manual measurement errors and providing precise, repeatable measurements that are not affected by human factors.
Solution Approach 2:
The patent implements automatic calibration where the machine control system autonomously performs the carding gap measurement and adjustment process. The system uses electrical measuring devices to measure the gap and automatically actuates adjustment mechanisms without requiring manual intervention, ensuring consistent and reliable calibration results.
2Productivity
If small carding gap is set for high carding quality, then yarn quality improves, but collision risk increases due to temperature changes
Solution Approach 1:
The patent implements a feedback control system where electrical measuring devices continuously or periodically measure the actual carding gap during operation. The machine control system receives this measurement data and automatically adjusts the carding gap to maintain the optimal setpoint, compensating for temperature changes and ensuring both high carding quality and machine safety.
Solution Approach 2:
The patent makes the carding gap dynamically adjustable during operation rather than fixed. The system can automatically change the carding gap in response to operating conditions such as temperature changes, allowing the machine to maintain optimal performance while preventing collisions that would occur with a fixed small gap setting.
3Reliability
If large carding gap is set to prevent collision, then machine safety improves, but carding quality deteriorates
Solution Approach 1:
The feedback control system continuously monitors the actual carding gap and automatically adjusts it to maintain the optimal value. This eliminates the need to set a large safety margin gap, as the system actively prevents collisions by maintaining the precise optimal gap, thereby preserving both machine safety and carding quality.
4Measurement precision
If automatic adjustment system is implemented, then measurement precision and reliability improve, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into the machine control system, including electrical measurement, data processing, and automatic actuation control. The control system serves as a universal platform that coordinates the electrical measuring devices, processes measurement data, and commands the adjustment mechanisms, reducing overall system complexity despite the added automation capabilities.
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
Ensures precise and safe operation by preventing collisions, maintaining optimal carding gaps, and adapting to changing conditions, thereby improving yarn quality and machine reliability.
Implementation Method 1
the drum and the at least one further component are connected to an electrical energy source but are electrically insulated from one another
Data Source
Figure 1
Figure 2a~2b
Figure 2c~2d
AI summary
The invention relates to a method for automatically setting and maintaining a defined distance between a rotatably mounted cylinder (4) and at least one further component of a textile machine, wherein: the cylinder and the at least one further component have a card clothing or a separating knife; the cylinder (4) and the at least one further component are connected to an electrical energy source but are electrically isolated from each other; at least one component is brought with the card clothing or separating knife thereof into contact with the card clothing of the cylinder (4), and at least one electrical contact is established, so that said distance (a) between the at least one component and the cylinder (4) is stored as a reference value in the machine controller, and the machine controller specifies a distance (a1, a2, a3) between the at least one component and the cylinder (4) as a command variable (F) for a regulator (R), and the regulator (R) actuates an actuator (A) by means of a control variable (S) to produce the distance (a1, a2, a3). The invention also relates to a textile machine.