Electric Veneer Lathe Actuators for Precise Peel Thickness
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Solution Overview
Problem
Conventional rotary veneer lathes and machine centers using hydraulic actuators face issues such as variations in peeling thickness, environmental concerns, frequent maintenance, and positioning errors due to the use of hydraulic systems.
Innovation Solution
The implementation of electric linear actuators with a roller screw assembly, a servo motor, and a linear transducer, which provides precise positioning and predictive maintenance capabilities, reducing the need for complex hydraulic systems and minimizing maintenance requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydraulic actuators are used for positioning veneer lathe carriages, then the system can achieve positioning function, but variations in peeling thickness occur and veneer quality deteriorates
Solution Approach 1:
The patent replaces hydraulic actuators with electric linear actuators that use a roller screw mechanism. This substitution eliminates the fluid compression variability inherent in hydraulic systems, providing more consistent and precise positioning of the veneer lathe carriage, thereby improving peeling thickness consistency and veneer quality.
Solution Approach 2:
The invention changes the actuation mechanism from hydraulic (fluid-based) to electric with roller screw (mechanical-based). This parameter change in the actuation system eliminates the compressibility issue of hydraulic fluid, resulting in more precise and repeatable carriage positioning that maintains consistent peeling thickness.
2Reliability
If hydraulic systems are used in veneer lathes, then positioning function is achieved, but environmental contamination occurs due to oil leaks
Solution Approach 1:
The patent substitutes hydraulic systems with electric linear actuators, eliminating the need for hydraulic fluid. This replacement removes the source of oil leaks and environmental contamination while maintaining the positioning function through electric motor-driven roller screw mechanisms.
Solution Approach 2:
The invention converts the harmful aspect of hydraulic systems (oil leaks causing environmental contamination) into a benefit by adopting an electric system that is inherently cleaner. The electric linear actuator provides the same positioning function without the harmful byproduct of hydraulic fluid leakage.
3Ease of operation
If hydraulic actuators are used for carriage positioning, then movement function is achieved, but frequent maintenance and repair are required
Solution Approach 1:
The patent replaces complex hydraulic systems with simpler electric linear actuators. This substitution reduces maintenance requirements by eliminating hydraulic components such as pumps, valves, and fluid seals that require frequent inspection and repair, while maintaining smooth carriage movement through the roller screw mechanism.
Solution Approach 2:
The electric linear actuator with roller screw mechanism is designed to be more self-sufficient and reliable, reducing the need for frequent maintenance. The solid mechanical components require less attention compared to hydraulic systems, allowing the carriage movement function to operate with minimal intervention.
4Ease of operation
If hydraulic actuators are used for positioning, then positioning function is achieved, but positioning errors occur due to system limitations
Solution Approach 1:
The patent replaces hydraulic actuators with electric linear actuators featuring roller screws and linear transducers. This substitution provides more precise positioning by eliminating hydraulic fluid compression variability and incorporating direct measurement capabilities through linear transducers, thereby reducing positioning errors.
Solution Approach 2:
The invention incorporates linear transducers in the electric linear actuator system that provide feedback on the actual position of the carriage. This feedback mechanism allows for precise control and correction of positioning, eliminating the positioning errors that occur in open-loop hydraulic systems.
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 electric linear actuators offer consistent peel thickness, higher production rates, reduced maintenance needs, and improved veneer quality by eliminating backlash and fiber density-related thickness variations.
Implementation Method 1
The carriage includes a roller screw assembly with a servo motor operable to rotate a screw of the roller screw assembly, thereby moving a nut of the roller screw assembly along the screw
Implementation Method 2
The carriage includes a linear transducer configured to detect a position of the carriage
Data Source
AI summary
Embodiments of an electric linear actuator may include a roller screw assembly, an electric motor coupled to the roller screw assembly, and a linear transducer operatively coupled with the roller screw assembly. The motor may be configured to drive the roller screw assembly to extend and retract another component, such as a rod. In some embodiments, the linear transducer may be configured to detect a position of the rod. The roller screw assembly may be coupled directly to the motor via a gear coupling, with the motor disposed generally in axial alignment with the roller screw assembly. Other embodiments disclosed herein include a veneer lathe carriage with electric linear actuators and corresponding apparatuses, methods, and systems.