Turn-up Device Bladder Rotation Reduces Friction Wear

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Solution Overview

Problem

Traditional tire building processes face issues with wear of turn-up bladders, bead setting components, and main shafts due to inadequate structural design and material selection, leading to increased production costs and reduced efficiency.

Innovation Solution

A turn-up device comprising a building machine main shaft, outer sleeve device, ply down finger assembly, bladder device, bead setting device, and bead locking device, with a multilayer bladder structure and optimized manufacturing process for the main shaft, allowing for improved rotation and reduced friction, enhanced adhesion, and prolonged equipment life.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a traditional bladder is used for turn-up process, then the turn-up function is achieved, but the bladder suffers serious wear due to friction with the rotating carcass material

Engineering Contradiction:

Improvebladder service lifeVSAvoidfriction wear

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The bladder is designed to rotate together with the building drum at the same speed, transforming from a static component to a dynamic one that moves with the system. This eliminates relative motion between the bladder surface and the carcass material, thereby preventing friction wear and extending bladder service life.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention converts the potentially harmful friction interaction into a beneficial synchronized rotation relationship. By making the bladder rotate with the building drum, the friction that previously caused wear is eliminated, and the bladder's rotation becomes a feature that maintains consistent contact without relative motion damage.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If a simple bead setting structure is used, then the device complexity is reduced, but the apex bead ring is not firmly bonded and bead setting members are severely worn

Engineering Contradiction:

Improvebead bonding strengthVSAvoidbead setting structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The bead setting device is divided into multiple functional components including a bead setting member with pressing portion, a dedicated bead setting structure, and associated driving mechanisms. This segmentation allows each component to perform its specific function effectively, ensuring firm bonding of the apex bead ring while managing complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bead setting operation is performed as a preliminary step before the turn-up process. The bead setting member presses the apex bead ring into position and bonds it firmly in advance, preventing subsequent displacement or damage during the turn-up operation, thereby ensuring reliable bead bonding.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If improper material selection and manufacturing process are used for main shaft, then the device complexity is reduced, but the main shaft is prone to premature wear and damage

Engineering Contradiction:

Improvemain shaft durabilityVSAvoidmain shaft manufacturing

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The main shaft is constructed using composite materials or surface treatments that combine the strength and wear resistance of hard materials with the toughness of base metals. This may include coated shafts or shafts with reinforced surfaces, providing enhanced durability against premature wear and damage while maintaining manufacturability through established industrial processes.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The manufacturing process of the main shaft involves optimizing material parameters such as hardness, tensile strength, and surface finish through controlled heat treatment, material selection, and processing parameters. These parameter changes ensure the main shaft achieves the necessary durability and wear resistance without excessive manufacturing complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11534996B2Turn-up device and tire building method using turn-up device

Publication Date: 2022.12.27 EVE RUBBER RES INST

AI summary

A turn-up device, comprising a building machine main shaft, an outer sleeve device, a ply down finger assembly, a bladder device, a bead setting device, and a bead locking device. The outer sleeve device, the ply down finger assembly and the bladder device are all sleeved on the building machine main shaft. The outer sleeve device is located on the outer sides of the ply down finger assembly and the bladder device along the radial direction of the building machine main shaft. The bead setting device is located on the outer sleeve device. A tire building method using the turn-up device can improve the building quality of tire beads, improve the service life of capsule, and provide promising precision of carcass.