Tyre Carcass Length Measurement Using Belt Pack Sensing
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Solution Overview
Problem
Current methods for detecting deviations in bead-to-bead length of tire carcass are time-consuming, destructive, and not feasible during the tire manufacturing process, leading to potential chassis vibrations and inefficiencies.
Innovation Solution
A non-destructive method using an inductive sensor to measure belt pack distances and a triangulation sensor or laser scan micrometer to determine tread thickness variations, allowing indirect measurement of bead core-to-bead core length deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods for detecting deviations in bead-to-bead length are used, then measurement can be performed, but the process is time-consuming and destructive
Solution Approach 1:
The patent replaces mechanical measurement methods with electromagnetic radiation (THz frequency) to measure belt pack position and calculate bead core-to-bead core length. This substitution enables non-contact, non-destructive measurement that is significantly faster than traditional mechanical methods while maintaining measurement precision.
Solution Approach 2:
The measurement is performed on the tire blank before vulcanization, allowing early detection of bead core-to-bead core length deviations. This preliminary measurement prevents defective tires from proceeding to subsequent manufacturing steps, saving time by avoiding rework or destruction later in the process.
2Measurement precision
If current methods for detecting deviations in bead-to-bead length are used, then measurement can be performed, but the method is destructive
Solution Approach 1:
The patent uses electromagnetic radiation (THz frequency) to penetrate and reflect off the belt pack, enabling measurement without physical contact or destruction of the tire structure. This allows the tire blank to remain intact and continue through the manufacturing process.
Solution Approach 2:
The belt pack acts as an intermediary reflector for the electromagnetic radiation. By measuring the reflection from the belt pack position, the system indirectly determines the bead core-to-bead core length without directly measuring the carcass, enabling non-destructive measurement.
3Measurement precision
If current methods for detecting deviations in bead-to-bead length are used, then measurement can be performed, but intervention in manufacturing processes cannot be timely
Solution Approach 1:
The measurement is performed on the tire blank immediately after assembly and before vulcanization, allowing real-time detection of deviations. This enables immediate feedback to the manufacturing process, allowing for timely intervention and adjustment to prevent production of defective tires, thereby improving overall manufacturing efficiency.
4Measurement precision
If multiple sensors are positioned to measure belt pack distances and tread thickness, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The radiation source and receiving device are designed to perform multiple measurement functions. By positioning sensors to measure both belt pack distance and tread thickness using the same electromagnetic radiation system, the device achieves multi-functionality, improving measurement precision without proportionally increasing complexity.
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
Enables precise, non-destructive detection of bead core-to-bead core length variations, facilitating early intervention in manufacturing processes and preventing undesirable chassis vibrations.
Implementation Method 1
an inductive sensor, wherein the distances of the belt pack to the inductive sensor are measured and recorded
Implementation Method 2
by means of a further sensor, for example a triangulation sensor, a laser scan micrometer or another scan micrometer, which is positioned in particular with positional accuracy to the inductive sensor, the distances to the tread surface are measured and recorded
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a method and device for determining deviations in the bead-core-to-bead-core length of a carcass (6), containing textile reinforcing elements, of a raw tyre or of a vulcanised tyre having a belt assembly (4), that is reinforced with steel reinforcing elements, and a tread (5), wherein, during travel of the tyre on a device by means of which the tyre can be made to rotate about the tyre axis (a), in particular in a uniform manner, at least one inductive sensor (8) is positioned in a defined and fixed position at a distance in front of the periphery of the tread (5) of the tyre, and while the tyre is made to rotate, in particular in a uniform manner, over at least one complete revolution, the distances (a1) of the tyre belt assembly (4) from the inductive sensor (8) are measured and recorded.