Folding Drum Arm Control for Green Tire Manufacturing
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Solution Overview
Problem
Existing tire blank rolling up installations lack control over arm pressure and trajectory, leading to inconsistent rubber application, which affects the mechanical properties and quality of the tires produced.
Innovation Solution
The installation allows independent control of arm rotation and sliding relative to the support, enabling precise control of arm position and pressure, and adjustable trajectories through a crown-mounted system with helical ramps and connecting rods, ensuring consistent rubber application regardless of support speed or position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If arms are driven in translation and rotation by a pneumatic cylinder, then the support can slide towards the blank, but the pressure applied by the arms to the raw rubber layer cannot be controlled
Solution Approach 1:
The system separates the control of arm translation and arm rotation into independent mechanisms. The support structure handles translation while the crown mechanism handles rotation, allowing independent control of each degree of freedom. This segmentation enables precise pressure control through the crown's rotational position while maintaining the simplicity of pneumatic-driven translation.
Solution Approach 2:
The system transitions from a static, coupled control mechanism to a dynamic, independently controllable system. The crown can rotate independently to adjust arm orientation and pressure application, while the support can slide independently to position the arms. This dynamic independence allows real-time adjustment of pressure and trajectory during the rubber layer application process.
2Productivity
If the support slides towards the blank to apply the raw rubber layer, then the arms can reach the blank, but the trajectory of the arms cannot be adjusted according to different tire types
Solution Approach 1:
The crown mechanism provides dynamic adjustment capability for arm trajectory. By rotating the crown to different angular positions, the system can adapt the arm trajectory to match different tire blank shapes and sizes. This dynamic reconfiguration allows the same support structure to handle multiple tire types without modifying the fundamental sliding motion.
Solution Approach 2:
The support structure serves multiple functions: it provides the sliding motion necessary to bring arms to the blank, and through the crown mechanism, it enables trajectory adjustment for different tire types. This multi-functionality allows a single apparatus to maintain high productivity across various tire production scenarios without requiring separate specialized equipment for each tire type.
3Manufacturing precision
If the arms are rotated by the sliding support, then the arms can apply rubber layer, but the position and pressure control is dependent on support position and speed
Solution Approach 1:
The control system is segmented into independent components: the support handles positional control through sliding, while the crown handles rotational control independently. This segmentation allows each component to be optimized for its specific function without increasing overall complexity. The pneumatic cylinder continues to drive the support sliding, maintaining simplicity, while the crown adds rotational control capability.
Solution Approach 2:
The crown acts as an intermediary mechanism between the support structure and the arms. It receives the sliding motion from the support and converts it, along with its own rotational input, into the final arm position and orientation. This intermediary role allows independent control of arm rotation from support position, improving precision without requiring direct coupling between all control elements.
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 solution improves the reproducibility and quality of tire production by allowing flexible arm movement and pressure control, adapting to different tire shapes and sizes, resulting in enhanced mechanical properties and consistent tire quality.
Implementation Method 1
at least one helical ramp formed on an external face of the support, and at least one roller bearing against the ramp and fixed to the ring
Data Source
Figure 1~2
Figure 3~4
Figure 5~8
AI summary
Folding-up system for manufacturing green tires (2), comprising: • - a drum (6), • - a support (14) mounted so as to be able to slide in relation to the drum (6), • - arms (38) that are pivotally connected to the support (14), and • - driving means (32) for rotating the arms (38) in relation to the support (14) independently of a sliding movement of the support (14) in relation to the drum (6); and associated method.