Tire Sealing Agent Application Force Control
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Solution Overview
Problem
Existing pneumatic tire sealing agent application systems face challenges in maintaining uniformity and adhesion due to deviations in the force applied by pressure rollers, especially at increased rotational speeds, leading to inconsistent sealing agent layers.
Innovation Solution
An application system with a pressure roller mounted on a freely rotating axis, equipped with a pneumatic spring and force sensor, and a control unit that adjusts the spring's actuation value to maintain a consistent force using feedback control and artificial intelligence algorithms to account for tire and sealing agent variations, ensuring uniform application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational speed of the pneumatic tire is increased to reduce application cycle time, then productivity is improved, but the force uniformity applied by the pressure roller deteriorates leading to inconsistent sealing agent layers
Solution Approach 1:
A force sensor is integrated into the pressure roller assembly to continuously measure the actual pressing force applied to the sealing agent layer. This measured force is fed back to a control unit that calculates corrective adjustments to the pneumatic spring actuation, compensating for variations caused by high rotational speeds and ensuring consistent force application throughout the application cycle.
Solution Approach 2:
The system dynamically adjusts the actuation parameters of the pneumatic spring based on real-time force measurements and tire rotational speed. By modifying the pneumatic pressure and timing parameters in response to changing operating conditions, the system maintains optimal pressing force uniformity even at increased rotational speeds that improve productivity.
2Adaptability or versatility
If a pressure roller with spring actuation is used to adapt to tire shape variations, then adaptability is improved, but force control precision deteriorates due to significant deviations from desired force values
Solution Approach 1:
The force sensor provides continuous feedback on the actual pressing force, enabling the control unit to calculate and apply corrective adjustments to the pneumatic spring actuation. This closed-loop control compensates for force deviations caused by tire shape variations, maintaining precise force control while preserving the adaptability benefits of spring actuation.
Solution Approach 2:
The system replaces purely mechanical spring actuation with a hybrid pneumatic-mechanical system where pneumatic pressure is dynamically controlled based on force sensor feedback. This substitution enables precise electronic control of the pressing force while maintaining the mechanical advantage of spring-based adaptation to tire shape variations.
3Device complexity
If a purely mechanical spring system is used for pressure roller actuation, then device complexity is reduced, but the ability to compensate for rotational speed variations and maintain force uniformity deteriorates
Solution Approach 1:
A force sensor is integrated into the pressure roller assembly to continuously measure the actual pressing force applied to the sealing agent layer. This measured force is fed back to a control unit that calculates corrective adjustments to the pneumatic spring actuation, compensating for variations caused by high rotational speeds and ensuring consistent force application throughout the application cycle.
Solution Approach 2:
The system replaces purely mechanical spring actuation with a hybrid pneumatic-mechanical system where pneumatic pressure is dynamically controlled based on force sensor feedback. This substitution enables precise electronic control of the pressing force while maintaining the mechanical advantage of spring-based adaptation to tire shape variations.
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
The system significantly reduces force variability, achieving more uniform and adherent sealing agent layers, improving the efficiency and accuracy of the application process.
Implementation Method 1
a pneumatic spring (16) that is suitable for pushing against the pressure roller (12) in order to constantly press the pressure roller (12) itself against the just deposited layer of sealing agent (2)
Implementation Method 2
a force sensor (18) that is suitable for determining the value of the force (F) which is exerted by the pneumatic spring (16) upon the pressure roller (12)
Data Source
AI summary
An application system and method for applying a sealing agent to the inner surface of a pneumatic tire includes: rotating, by means of a support device, the pneumatic tire about an axis of rotation; applying a layer of sealing agent to the inner surface of the pneumatic tire by means of a dispensing head arranged within the pneumatic tire itself; pressing, by means of a pressure roller, the just applied layer of sealing agent against the inner surface of the pneumatic tire; pushing the pressure roller against the just applied layer of sealing agent by means of an actuator which generates a force having a desired value; determining, by means of a force sensor, a measured value of the force generated by the actuator; and cyclically varying the force generated by the actuator as a function of the measured value of the force.