Suction Device Oblique Motion for Sack Bottom Opening
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Solution Overview
Problem
Existing sack manufacturing plants face challenges with intermittent operation, high demands on drives, and limited throughput due to inefficient bottom opening mechanisms, particularly for wide bases where uneven opening movements cause material twisting, leading to difficulties in inserting spreading tools.
Innovation Solution
A bottom opening device with suction devices that can move in an oblique direction, articulated on pivot arms and a carrier carriage, allowing precise control and adjustment of suction points relative to the bag body's centerline, ensuring uniform separation and preventing twisting, while being robust, simple, and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple swivel arm mechanism is used for opening the tubular sack body, then the device complexity is reduced, but the opening movement becomes uneven causing material twisting for wide bases
Solution Approach 1:
The suction devices are mounted on a movable carrier carriage that can be positioned at different locations along the guide rail, allowing the opening mechanism to adapt dynamically to different base widths. This dynamic positioning enables uniform opening movement across varying sack dimensions while maintaining a relatively simple overall device structure.
Solution Approach 2:
The opening mechanism is segmented into independent components: the carrier carriage, the guide rail, and the suction devices. This segmentation allows the carrier carriage to move independently along the guide rail, providing precise control over the opening process without requiring a complex integrated mechanism.
2Device complexity
If intermittent operation is used for bottom opening, then the drives are simpler, but the throughput of sack bodies is limited
Solution Approach 1:
The carrier carriage can move continuously along the guide rail, enabling continuous operation of the bottom opening process. This continuous movement allows multiple sack bodies to be processed in sequence without interruption, significantly increasing throughput while maintaining relatively simple drive system requirements.
3Device complexity
If suction devices are fixed in position, then the device complexity is reduced, but the adaptation to different base widths is limited
Solution Approach 1:
The carrier carriage providing movable mounting for suction devices enables dynamic positioning adjustment along the guide rail. This allows the same device to adapt to different base widths by simply repositioning the carrier carriage, achieving high versatility without complex positioning systems.
4Manufacturing precision
If linear opening movement is implemented, then the separation uniformity is improved, but the device complexity increases compared to rotational movement
Solution Approach 1:
The linear opening movement is achieved through segmented, independent components: the guide rail provides the track, the carrier carriage provides the moving platform, and the suction devices perform the separation function. This segmentation achieves uniform linear movement without requiring a complex integrated mechanism.
Solution Approach 2:
The carrier carriage acts as an intermediary between the guide rail and the suction devices, enabling linear movement while keeping the overall mechanism simple. This intermediary component translates the guiding function into uniform linear motion for precise separation.
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 continuous operation with high production rates, precise opening of sack bottoms of varying widths, and reliable transfer to subsequent processing stations without material distortion, improving handling of sacks made from stretched plastic tapes or films.
Implementation Method 1
suction devices which can be moved towards one another until they rest against the tube walls of the end region of the bag body located between them and can then be moved away from one another while exerting a suction force on the respective tube wall
Data Source
Figure 1~2
Figure 3~6
Figure 4
AI summary
A device (1) for opening an end region (10e) of a tubular bag body (10), extending between an open end (10k) of the tube body and a base centerline (10j), comprises a transport device (2) on which the bag body (10) with adjacent tube walls (10a, 10b) is transported at a transport speed (V) in a transport direction (T), the base centerline (10j) being aligned in the transport direction (T). Furthermore, suction devices (13, 14) movable back and forth transversely to the transport direction (T) are provided, which can be moved towards each other until they bear against the tube walls (10a, 10b) of the end region (10e) of the bag body (10) located between them, and can then be moved away from each other by exerting a suction force on the respective tube wall, thereby pulling the tube walls apart.The suction devices (13, 14) are additionally movable back and forth in an inclined direction (S), which is aligned on the one hand in the transport direction (T) and on the other hand at an angle (α) to the floor centerline (10j).