Linear Actuator Leverage Assembly for Controlled Roll Nip Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Roll-molding processes involving viscous resins require controlled movement and loading of calendering rolls to avoid damage from high nip pressures, which existing technologies struggle to manage effectively, especially in continuous touch fastener manufacturing.
Innovation Solution
A linear actuator leverage assembly with a structural base, rail member, lever arm, and drive cylinder that moves the mold roll along a specific path to increase leverage and apply controlled pressure, allowing for precise movement and loading of the mold roll relative to a reaction surface, enabling the creation of a pressure zone for resin molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If hydraulic cylinders are used to force rolls together to create high nip pressure, then the required pressure for molding viscous resin is achieved, but the risk of damaging roll surfaces increases when pressure is applied without resin in the nip
Solution Approach 1:
The system performs preliminary action by ensuring resin is present in the nip zone before high pressure is applied. The resin delivery system is positioned and controlled to supply resin to the nip area prior to the rolling elements applying pressure, preventing direct metal-to-metal contact and surface damage.
Solution Approach 2:
Resin acts as an intermediary substance between the rolling elements and the substrate. The resin delivery system introduces this intermediary material into the nip zone, allowing pressure to be applied to the resin rather than directly to the roll surfaces, thereby protecting the rolls from damage.
2Ease of operation
If conventional linear actuators are used to move mold rolls, then simple actuation is achieved, but controlled movement and loading under high pressure conditions is insufficient
Solution Approach 1:
The system transitions from static to dynamic control by incorporating a lever arm mechanism that allows the actuator to move through different positions. This dynamic arrangement enables precise control of the mold roll's movement and loading, adjusting the mechanical advantage at different stages of the operation to achieve both simplicity and precision.
Solution Approach 2:
The system adds a dimensional element by introducing a lever arm that moves through angular positions rather than just linear displacement. This angular dimension provides additional control capability, allowing the actuator to apply force at different angles and positions to precisely control the mold roll's movement and loading under pressure.
3Device complexity
If direct linear actuation is used to apply pressure to the mold roll, then the actuator structure is simple, but leverage and pressure application efficiency are insufficient
Solution Approach 1:
The lever arm mechanism provides dynamic leverage by changing the mechanical advantage ratio as the actuator moves through its range of motion. This dynamic leverage amplifies the actuator's output force at critical moments during the pressing cycle, significantly improving pressure application efficiency without requiring a more complex actuator system.
Solution Approach 2:
The system uses the lever arm to rapidly transition through the pressing phase, applying high pressure efficiently over a short duration. The mechanical advantage provided by the lever arm allows the actuator to quickly overcome resistance and complete the molding action, improving overall power efficiency by minimizing the time and energy required for pressure application.
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 solution allows for controlled and efficient application of nip pressure, ensuring the integrity of roll surfaces while effectively molding resin into cavities, enhancing the production of touch fastener products by ensuring precise and consistent resin layer formation.
Implementation Method 1
a linear actuator with a first end coupled to the base and a second end connected to the lever arm at a second pivot
Implementation Method 2
the lever arm pivots about the bearing surface as a fulcrum, increasing leverage applied by the actuator to the rail
Implementation Method 3
increasing leverage applied by the actuator to the rail
Implementation Method 4
the linear actuator includes a drive cylinder configured to be actuated under fluid pressure
Data Source
AI summary
A linear actuator leverage assembly including a base with a side surface and a back surface defining between them a corner, a rail member coupled to the base, a lever arm with a bearing surface, and a linear actuator. The lever arm is pivotally connected to the rail member at a first pivot and to the linear actuator at a second pivot. The linear actuator is configured to move the rail member with respect to the base over a linear stroke of the linear actuator that moves the second pivot of the lever arm along a continuous motion path. The motion path includes a first path segment generally parallel to the side surface and a second path segment, over which the lever arm pivots about the bearing surface as a fulcrum, thereby increasing leverage applied by the actuator to the rail.