Decentralized Pilot Control for Carding Machine Sensor Cabling
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Solution Overview
Problem
The existing spinning preparation machines, such as cards, face significant challenges with lengthy and expensive electrical cabling and shielding due to the large number of sensors and actuators, leading to complex and time-consuming error detection and correction processes.
Innovation Solution
The implementation of a pilot control system that processes data from sensors and drives independently of the machine control, allowing for shorter cabling, reduced interference susceptibility, and easier error detection, with the pilot control arranged near the drum and communicating through a digital BUS system for efficient data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical cables are used to connect sensors and drives to the machine control system, then data transmission can be achieved, but the cabling becomes lengthy and expensive requiring extensive shielding against high-frequency currents
Solution Approach 1:
The control system is segmented into decentralized pilot controls distributed at different locations in the machine. Each pilot control handles local sensors and drives independently, eliminating the need for long centralized cabling. This segmentation reduces cable length and complexity while maintaining reliable data transmission locally.
Solution Approach 2:
A digital bus system is introduced as an intermediary communication medium between pilot controls and the machine control system. This digital bus replaces extensive analog cable networks, simplifying the overall cabling structure while enabling reliable data exchange between distributed components.
2Adaptability or versatility
If numerous sensors and actuators are installed throughout the machine, then monitoring and control capabilities are improved, but the number of electrical cables increases to several hundred meters requiring expensive shielding
Solution Approach 1:
The machine control is divided into multiple independent pilot controls distributed at relevant locations. Each pilot control manages a subset of sensors and actuators locally, reducing the need for extensive centralized cabling. This segmentation maintains comprehensive monitoring and control capabilities while significantly reducing installation costs.
Solution Approach 2:
The control architecture transitions from a centralized two-dimensional plane (all cables running to a central control cabinet) to a three-dimensional distributed network where pilot controls are positioned throughout the machine. This spatial redistribution minimizes cable lengths and eliminates the need for expensive shielding.
3Extent of automation
If all sensor data is routed through the central control cabinet, then centralized processing is achieved, but error detection and troubleshooting become very time-consuming
Solution Approach 1:
The control system is segmented into autonomous pilot controls that process and evaluate sensor data locally. This distributed intelligence enables immediate error detection at the source without requiring centralized analysis of all signals. Troubleshooting is simplified as each pilot control can be independently diagnosed and repaired.
Solution Approach 2:
Each pilot control incorporates local feedback mechanisms that immediately detect and report errors to both the local operator interface and the central control system. This multi-level feedback approach enables rapid error detection and localization, significantly reducing troubleshooting time while maintaining centralized oversight.
4Object-affected harmful factors
If electrical cables are shielded against high-frequency currents, then interference is reduced, but the installation effort and cost increase significantly
Solution Approach 1:
The analog electrical cable system requiring physical shielding is replaced with a digital bus system that transmits data in digital form. This substitution eliminates the need for expensive shielding materials and complex installation procedures while maintaining signal integrity through digital protocols that are inherently more resistant to electromagnetic interference.
Data Source
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Figure 2
AI summary
The invention relates to a spinning preparation machine, in particular a carding machine (K), having an inlet side for fibre flakes, which are fed to a rotating drum (4) by means of rollers, and, between fixed carding elements and circulating flat bars (14) and the drum (4), are opened into individual fibres, oriented and cleaned, and the resultant fibrous web is transferred from the drum (4) to a doffer (5), downstream of which at least one take-off unit for the further processing or storage of the fibrous web (19) is arranged, comprising a machine controller (26) configured to process and regulate at least the production data. The invention is characterized in that the spinning preparation machine has at least one pilot controller (24) configured to process data from sensors and/or drives independently of the machine controller (26) and to control the drives connected to the pilot controller (24).