Rubber Mixing Control via Volatile Gas Detection
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Solution Overview
Problem
The production of silica-containing rubber mixtures for tire manufacturing is inefficient and poses safety risks due to the release of flammable alcoholic gases during the mixing process, requiring high-energy suction and random sampling for monitoring.
Innovation Solution
A process where volatile organic compounds, especially alcoholic gases, are continuously detected in the suction device, triggering closed-loop control of process parameters such as rotor speed, suction output, and mixing time to maintain safety limits and optimize energy usage, with safety shutdowns and gas dilution methods to prevent hazardous conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-performance suction is used to remove alcoholic gases, then safety is improved, but energy consumption increases enormously
Solution Approach 1:
A sensor continuously monitors the concentration of alcoholic gases in the suction stream and feeds this information back to the control unit. The control unit adjusts the suction device's operating state dynamically based on the measured concentration, maintaining safety while minimizing energy consumption when gas concentrations are low.
Solution Approach 2:
The suction device transitions from static high-performance operation to dynamic operation where the suction strength is continuously adjusted based on real-time gas concentration measurements. This allows the system to use only the necessary suction power at any given moment rather than continuously operating at maximum capacity.
2Reliability
If random sampling is used to monitor alcoholic gases, then safety monitoring is achieved, but detection precision is insufficient and requires high-performance suction
Solution Approach 1:
The sensor performs continuous monitoring of alcoholic gas concentrations in the suction stream rather than random sampling. This provides constant real-time data about gas concentrations, enabling precise detection and immediate response to hazardous conditions while allowing for more efficient suction operation.
3Reliability
If continuous monitoring and closed-loop control are implemented, then safety and energy efficiency are improved, but device complexity increases
Solution Approach 1:
The system uses a sensor to continuously measure alcoholic gas concentration in the suction stream and feeds this information back to a control unit. The control unit automatically adjusts the suction device's operating parameters based on the measured concentration, creating a closed-loop control system that maintains safety while optimizing energy consumption.
Solution Approach 2:
The sensor acts as an intermediary between the mixing chamber and the suction device, providing real-time information about gas concentrations. This intermediary enables the control unit to make informed decisions about suction operation without requiring direct complex interaction between all system components.
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 ensures safer and more energy-efficient rubber mixture production by real-time monitoring and control, reducing the risk of explosions and enhancing throughput while minimizing energy consumption.
Implementation Method 1
the gas mixture present in and above the mixing chamber is sucked out by means of the suction device
Implementation Method 2
volatile organic compounds, especially alcoholic gases, present in the gas mixture sucked in are detected continuously in the suction device
Data Source
AI summary
A process for producing a rubber mixture in a mixing apparatus having at least one mixing chamber (4, 4′) in which rotors (5) are disposed, wherein a plant control system process parameters (especially the speed of the rotors (5), the suction output of a suction device (13, 14, 15) and the mixing time) are controlled by open- and closed-loop control is provided, wherein at least one rubber is mixed in the mixing chamber with at least one filler, especially silica, preferably with addition of at least one coupling agent, especially a silane, and wherein the gas mixture present in and above the mixing chamber is sucked out by the suction device, wherein volatile organic compounds, especially alcoholic gases, present in the gas mixture sucked in are detected continuously, wherein, in the event of exceedance of a concentration of organic compounds in the gas mixture sucked in that has been defined as the control limit, the concentration measured is employed as control variable in the plant control system for closed-loop control of at least one of the process parameters, and wherein, in the event of exceedance of a concentration of organic compounds in the gas mixture sucked in that has been defined as the safety limit, there is a safety shutdown of the mixing apparatus via the plant control system.