Cam-Driven Brush Assembly for Preform Rail Jam Prevention
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Solution Overview
Problem
Conventional gravity feed rail systems in plastic container manufacturing experience jamming and blocking issues due to preforms getting stuck, leading to lower quality products and production line shutdowns, which are exacerbated by tighter tolerances intended to prevent jamming.
Innovation Solution
A brush system with a cam mechanism and motor-driven brush assembly that moves in perpendicular directions to guide and realign preforms along the rail, minimizing jamming and improving movement by engaging and adjusting the position of preforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tighter tolerances are used between inner flanges and preform neck, then jamming is reduced, but friction increases leading to lower quality bottles
Solution Approach 1:
A brush assembly is introduced as an intermediary element between the preform neck and the inner flanges of the gravity rail. The brushes contact the preform neck and provide guidance and alignment, reducing the direct contact and friction between the preform neck and the rail flanges. This mediator allows for slightly looser tolerances while preventing jamming, and simultaneously reduces friction damage to the preform.
Solution Approach 2:
The system changes the physical state and properties of the contact interface by introducing flexible brush elements instead of rigid contact surfaces. The brushes can deform and adapt to the preform neck dimensions, providing consistent contact with reduced friction coefficients compared to rigid flange-preform contact. This parameter change in the contact mechanism allows for improved reliability without increasing friction damage.
2Device complexity
If conventional gravity rail system is used, then simple transfer is achieved, but jamming and blocking occur requiring production line shutdowns
Solution Approach 1:
The brush assembly serves as a mediator that enhances the performance of the simple gravity rail system without fundamentally changing its operation. The brushes continuously contact and guide the preforms, preventing jamming and blocking that would otherwise require production line shutdowns. This maintains the simplicity of the gravity rail concept while eliminating the productivity-killing interruptions.
Solution Approach 2:
The brush assembly operates continuously along the gravity rail, providing constant guidance and alignment of preforms as they move through the system. This continuous action prevents intermittent jamming and blocking events that would disrupt production continuity. The brushes are constantly engaged with the preforms, ensuring smooth transfer without interruptions to the manufacturing process.
3Manufacturing precision
If tighter tolerances are applied to prevent preform neck contact issues, then alignment improves, but friction increases causing preform damage
Solution Approach 1:
The brush assembly acts as an intermediary that provides precise alignment guidance without requiring tight tolerances between the preform neck and rail flanges. The flexible brush elements can adapt to slight variations in preform dimensions while maintaining consistent alignment, thereby achieving manufacturing precision without the harmful friction effects of tight tolerance rigid contact.
Solution Approach 2:
The system changes the contact parameters from rigid high-friction interfaces to flexible low-friction brush contacts. The brushes provide sufficient guidance forces for precise alignment while their flexible nature and lower coefficient of friction prevent damage to the preform surface and threading, resolving the contradiction between alignment precision and preform integrity.
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 brush system effectively reduces jamming and blocking, ensuring smooth transfer of preforms, maintaining product quality, and preventing production line interruptions.
Implementation Method 1
a cam including a follow extending perpendicularly from the cam... Rotation of the cam causes the bracket and the brush assembly to move in a first direction, and the brush holder and the plurality of brushes of the brush assembly to move in a second direction substantially perpendicular to the first direction
Data Source
AI summary
Brush systems for transferring preforms along a rail include a cam including a follow extending from the cam, and a bracket positioned adjacent the cam. The bracket includes a slot for receiving the follow of the cam. The brush system also includes a brush assembly coupled to the bracket. The brush assembly includes a yoke positioned adjacent to and operably connected to the cam, a brush holder coupled to the yoke, opposite the cam, and a plurality of brushes positioned within the brush holder. Additionally, the brush system includes a motor coupled to and configured to rotate the cam. Rotation of the cam causes the bracket and the brush assembly to move in a first direction, and the brush holder and the plurality of brushes of the brush assembly to move in a second direction substantially perpendicular to the first direction.