Stretch Packaging Machine Friction-Gradient Loading Mechanism
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Solution Overview
Problem
In stretch packaging machines, containers with openings tend to tumble when moved onto lift mechanisms, leading to potential spills and positional inaccuracies during packaging.
Innovation Solution
The machine employs a lift mechanism with loading members having varying frictional coefficients, where the first group on the near side has a low friction coefficient to prevent catching and the second group on the far side has a high friction coefficient to maintain positional precision, ensuring the container is securely conveyed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform friction coefficient is used for all loading members, then the structure is simple, but the container tumbles and loses positional precision
Solution Approach 1:
The loading members are divided into two groups with different friction coefficients: the first group (near side) has a lower friction coefficient to prevent tumbling, while the second group (far side) has a higher friction coefficient to maintain positional precision. This local differentiation resolves the contradiction by optimizing each region's friction properties according to its specific functional requirements during container conveyance.
2Stability of the object's composition
If high friction coefficient is used for all loading members, then positional precision is maintained, but the container catches and tumbles
Solution Approach 1:
The first group of loading members on the near side uses a lower friction coefficient to allow smooth container passage and prevent tumbling, while the second group on the far side uses a higher friction coefficient to secure the container and maintain positional precision. This localized property variation simultaneously achieves both stability and precision.
3Ease of operation
If low friction coefficient is used for all loading members, then the container moves smoothly, but the container slides to unintended position
Solution Approach 1:
The first group of loading members (near side) employs a lower friction coefficient to enable smooth container movement and prevent catching, while the second group (far side) uses a higher friction coefficient to prevent sliding to unintended positions. This spatial differentiation of friction properties resolves the contradiction between smooth movement and positional accuracy.
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 configuration effectively prevents container tumbling and enhances positional precision during packaging, ensuring accurate and spill-free operation.
Implementation Method 1
the frictional coefficient of at least a first group of the loading members, which is configured to contact with the container and disposed on a near side in the moving direction in which the container is moved by the container movement mechanism, is smaller than the frictional coefficient of a second group of the loading members disposed on a far side in the moving direction
Data Source
AI summary
A stretch packaging machine is provided with a lift mechanism and a tray movement mechanism. The lift mechanism has a plurality of loading members on which a tray is loaded and which lift up the tray toward film such that the tray contacts the film sealing an opening at the top of the tray. The tray movement mechanism is configured to move the tray slidingly over the loading members of the lift mechanism to a predetermined position on the loading members. A frictional coefficient of at least first loading members is such that contact between the tray and the loading members disposed on the near side in the moving direction in which the tray is moved by the tray movement mechanism is smaller than the frictional coefficient of second loading members disposed on the far side in the moving direction.