Rotatable Bushing for Conveyor Belt Alignment
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Solution Overview
Problem
Conveyor belt alignment systems face limitations due to restricted range of adjustment in conventional ball bushings, leading to premature failure and misalignment issues, especially with uneven loading and carry-back material causing misalignment.
Innovation Solution
The introduction of a rotatable 'Oil-Lite' bushing system with a freely rotating block and lubrication fittings, allowing greater range of rotation and accommodation of shaft deflection, combined with a guide control bar and pivot mechanism for continuous belt alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional ball bushings are used in the pivoting member, then the structure is simple and easy to manufacture, but the range of adjustment is limited and the bushings bottom out before required alignment movement is achieved
Solution Approach 1:
The bushing block is made freely rotatable about a vertical axis, transforming the static bushing structure into a dynamic one that can adapt to varying alignment requirements. This rotational freedom allows the bushing to accommodate greater ranges of movement without bottoming out, directly resolving the contradiction between adjustment range and structural simplicity.
Solution Approach 2:
The bushing design allows for changes in the angular position parameter through free rotation about the vertical axis. This parameter change capability enables the bushing to accommodate larger alignment movements while maintaining structural integrity, overcoming the limitation of conventional fixed-position bushings.
2Reliability
If conventional ball bushings are used, then the manufacturing cost is low, but corrosion occurs and premature failure happens
Solution Approach 1:
The bushing material properties are changed through the use of corrosion-resistant materials such as stainless steel or coated surfaces. This material parameter change prevents corrosion and extends the service life of the bushing, resolving the contradiction between reliability and manufacturing ease.
Solution Approach 2:
A corrosion-resistant coating or material layer acts as an intermediary between the bushing and the corrosive environment. This protective layer prevents direct contact between the bushing material and corrosive agents, thereby preventing corrosion and premature failure while maintaining manufacturability.
3Manufacturing precision
If tracking adjustments are made to correct misalignment, then belt alignment is improved, but the belt may be stretched in inappropriate areas
Solution Approach 1:
The pivoting members with freely rotatable bushings provide continuous feedback on belt alignment status and automatically adjust to correct misalignment. This feedback mechanism allows for gradual, controlled corrections that maintain belt integrity while achieving precise alignment, preventing the excessive adjustment that causes stretching.
Solution Approach 2:
The dynamic rotation capability of the bushing allows the tracking rollers to adapt their position continuously during operation. This dynamic adjustment enables precise belt alignment through small, progressive movements rather than large, disruptive corrections, thereby maintaining belt strength and integrity.
4Productivity
If carry back material is present on the conveyor, then material handling is complete, but material build up causes rollers and pivot mechanism to seize into misalignment position
Solution Approach 1:
The freely rotatable bushing acts as an intermediary that prevents direct seizure between the pivot mechanism and carry back material. The rotational freedom allows the bushing to move independently, preventing material accumulation from causing the pivot mechanism to seize, thereby maintaining both productivity and reliability.
Solution Approach 2:
The dynamic rotation capability of the bushing prevents material build-up from causing misalignment. As the bushing can freely rotate, it prevents the pivot mechanism from being forced into a fixed misaligned position by accumulated material, ensuring continuous operation without seizure.
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 provides improved belt alignment with increased range of adjustment, reducing downtime and extending the operational life of both the alignment system and conveyor by effectively maintaining belt alignment and preventing material buildup.
Implementation Method 1
a bushing block pivotally mounted in said bushing chamber for free rotation about a vertical axis
Implementation Method 2
Suitable lubrication fittings are preferably provided on the housing for lubrication of the bushing
Data Source
AI summary
A conveyor alignment system including pivoting members that support tracking rollers at corresponding shaft ends. Each shaft end being pivotally and non-rotatably attached to corresponding pivoting members by a rotating bushing mounted in a corresponding one of the pivoting members. A guide control bar is pivotally connected at each end to a corresponding torque arm, where the bar includes guide rollers positioned at both edges of the conveyor belt for lateral control of the belt. A spacer is mounted to the support bracket and has a designated height. The spacer deflects the support bracket by the height so that a first end of the shaft is closer to the a first side of the belt than an opposing, second end of the shaft to increase the tension of the rollers on the first side of the belt and reduce the tension of the rollers on another side of the belt.