Stack Rotation Mechanism with Selective Suction Retention
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Solution Overview
Problem
Existing methods for rotating stacks about a vertical axis on conveying devices are not structurally simple and reliable, particularly when rotating by specific angles like 90 degrees, as they often require complex mechanisms and high frictional forces.
Innovation Solution
A device with a selective restraining force applied to the underside of the stack using a suction mechanism and freely rotatable rollers to reduce friction and enhance torque, allowing controlled rotation by lifting the stack at the restraint point and in front of it, with independently controlled conveyor sections for precise angle measurement and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotating conveyor with parallel transport devices is used to rotate stacks, then the stack can be rotated about a vertical axis, but the device structure becomes complex and the frictional forces increase
Solution Approach 1:
The conveyor system is divided into a driven feed conveyor and a separate rotating conveyor with independently controllable transport devices. This segmentation allows each component to perform its specific function optimally, reducing overall system complexity while maintaining rotation reliability.
Solution Approach 2:
The rotating conveyor features transport devices whose speed and running direction can be controlled or regulated independently. This dynamic control capability enables flexible adjustment of rotation parameters without requiring complex mechanical linkages, thereby reducing structural complexity while ensuring reliable rotation.
2Force
If the stack is lifted at the restraint point to reduce frictional force, then the rotational movement is improved, but the stack may shift on the conveying surface
Solution Approach 1:
A retaining device with suction capability is introduced as an intermediary between the stack and the conveying surface. This intermediary applies a selective restraining force at the restraint point, holding the stack in place while allowing controlled lifting to reduce friction, thus preventing unwanted shifting during rotation.
Solution Approach 2:
The suction force parameter is adjusted to create a restraining force that exceeds the frictional force. By changing the suction parameter, the system achieves optimal balance between reducing friction for rotation and maintaining sufficient holding force to prevent stack shifting.
3Measurement precision
If independently controlled conveyor sections are used to achieve reliable rotation over large angular range, then measurement precision is improved, but device complexity increases
Solution Approach 1:
An angle measuring device is integrated into the rotating conveyor to detect and control the rotation angle. This feedback mechanism provides real-time information about the stack's angular position, enabling precise control over the rotation range without requiring overly complex mechanical guidance systems.
Solution Approach 2:
The independently controlled transport devices serve multiple functions: they convey the stack forward, provide the lifting action for rotation, and work in coordination with the angle measuring device to achieve precise angular control. This multi-functionality reduces the need for separate dedicated components for each function.
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 reliable and efficient rotation of stacks over a large angular range with reduced frictional forces, ensuring stable holding and increased torque, allowing for precise control and reduced propulsion forces during rotation.
Implementation Method 1
The retention force caused by the suction force at the pivot point is greater than the frictional force applied by the conveyor to the underside of the stack
Implementation Method 2
a reduced frictional force between the conveying surface and the underside of the stack is generated on the retained longitudinal side
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a method and apparatus for rotating a stack (2), resting on a conveying surface, about an axis perpendicular to the conveying surface, wherein a retention force that counteracts the conveying direction (5) is allowed to act selectively on the underside of the stack (2) on a longitudinal side in the front region in the conveying direction, said retention force bringing about a rotational movement when the stack (2) is transported further.