Electric Actuator Sod Stacking Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sod harvesting systems face challenges with slow and inaccurate stacking due to hydraulic actuators, which are costly, prone to vibration, and require frequent maintenance, and struggle with stacking on sloped surfaces and maintaining stack stability.
Innovation Solution
An electric actuator-based stacking mechanism that allows movement in three axes with position feedback sensors and temporary pallet support wings, enabling precise and efficient stacking of sod slabs without the need for hydraulic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If hydraulic actuators are used for stacking, then the stacking mechanism can be implemented, but the response time is slow and positioning accuracy is limited
Solution Approach 1:
The patent replaces hydraulic actuators with electric actuators (linear motors and rotary motors) to drive the stacking head. This substitution eliminates the slow response and positioning inaccuracies inherent in hydraulic systems, enabling faster and more precise stacking operations while maintaining the mechanical stacking function.
2Productivity
If servo-hydraulic control valves are used to improve speed and accuracy, then performance improves, but cost increases significantly
Solution Approach 1:
The patent substitutes electric actuators for servo-hydraulic control valves, achieving high-speed and high-precision stacking control through electrical means. This eliminates the need for expensive servo-hydraulic components while maintaining or improving performance, making the system more cost-effective for sod harvesting equipment.
Solution Approach 2:
The patent employs cost-effective electric actuators and standard feedback sensors rather than expensive precision hydraulic components. This approach uses more affordable components that can be easily replaced if needed, reducing overall system cost while achieving the required productivity.
3Productivity
If proportional valves are used, then some performance improvement is achieved, but vibrations are generated and additional ground rollers are needed
Solution Approach 1:
The patent replaces proportional hydraulic valves with electric actuators that provide smooth, vibration-free motion control. The electric motors inherently generate less vibration and do not require additional ground rollers to dampen vibrations, eliminating this harmful effect while maintaining improved stacking productivity.
4Ease of operation
If hydraulic systems are used, then actuation is achieved, but warm-up period is required and fuel is wasted
Solution Approach 1:
The patent replaces the hydraulic fluid system with an electrical actuation system. Electric actuators can be immediately activated without warm-up periods, allowing the stacking mechanism to be ready for operation instantly. This eliminates the fuel waste associated with heating hydraulic fluid while maintaining ease of operation.
5Ease of operation
If hydraulic cylinders with seals are used, then actuation is achieved, but seal life is short and leaking occurs after high velocity moves
Solution Approach 1:
The patent substitutes hydraulic cylinders with electric actuators that have no seals requiring maintenance. The electric motor-driven mechanism eliminates the sealing components that are prone to failure from high-velocity movement, significantly improving actuator reliability and eliminating leaking issues while maintaining full actuation capability.
6Force
If rotary hydraulic motors are used, then rotation is achieved, but angular position control is inadequate on sloped surfaces
Solution Approach 1:
The patent replaces rotary hydraulic motors with electric rotary motors that provide precise angular position control through electrical feedback. This substitution maintains the rotational force capability while dramatically improving angular position accuracy, enabling the stacking head to maintain correct positioning on sloped surfaces without drift.
7Measurement precision
If hydraulic valves with small clearances are used, then control precision is improved, but sensitivity to contaminants increases and filtration requirements increase
Solution Approach 1:
The patent replaces precision hydraulic valves with electric actuators that have no moving parts with small clearances. This eliminates sensitivity to contaminant particles and removes the need for aggressive filtration systems, simplifying the overall device while maintaining or improving control precision through electrical means.
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 provides faster, more accurate, and cost-effective sod stacking with improved stability and reduced maintenance needs, allowing continuous harvesting without the need for pallet compaction, and operates effectively on sloped surfaces and varying temperatures.
Implementation Method 1
The stacking head is moveable in x, y, and r axes. The stacking mechanism includes one or more electrical actuators to apply forces to move the stacking head in the x, y, and r axes
Data Source
AI summary
The present invention extends to a stacking mechanism having electrical actuators for stacking slabs of sod on a sod harvesting machine. The electrical actuators allow the stacking head to be driven in three axes. The stacking mechanism also includes position feedback sensors for reporting the position of the stacking head to enable precision when operating the stacking head at a fast rate. The stacking mechanism of the present invention also provides temporary pallet support wings to enable the continued stacking of slabs of sod on one pallet even while another pallet is being dropped from the sod harvesting machine.