Variable Force Feed Roller Hydraulic System for Chipper Jamming
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Solution Overview
Problem
Existing chipper systems face challenges in consistently applying the right force to feed rollers to effectively grab and pull large, heavy materials into the chipping mechanism, leading to either slipping or jamming issues.
Innovation Solution
A hydraulic fluid system independent from the feed roller drive pump is used to apply a variable and controlled force between the feed rollers, allowing for efficient and effective engagement of materials, with a dedicated pump for down pressure application and an adjustable pressure mechanism for manual override.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a constant force system is used to direct feed rollers together, then the system structure is simple, but the feed rollers cannot effectively pull large, heavy materials without slipping or causing jams
Solution Approach 1:
The patent applies a variable force system where the force between feed rollers can be dynamically adjusted based on material size and type. The hydraulic system allows the force to vary from light (for small materials) to heavy (for large, heavy materials), resolving the contradiction between structural simplicity and operational effectiveness.
Solution Approach 2:
The system changes the force parameter dynamically to match different feeding conditions. By adjusting hydraulic pressure, the force between rollers is optimized for each specific material being fed, enabling effective handling of both small and large materials without slipping or jamming.
2Force
If a large hydraulic pump is used to apply sufficient down pressure for large materials, then the feed rollers can pull heavy materials, but hydraulic inefficiency increases
Solution Approach 1:
The system uses a small hydraulic pump that dynamically adjusts pressure output based on real-time feedback from load-sensing technology. This allows the pump to deliver high force only when needed for large materials, while maintaining low power consumption during normal operation with smaller materials, thus resolving the contradiction between force application and energy efficiency.
Solution Approach 2:
The hydraulic system incorporates load-sensing feedback mechanisms that monitor the actual force required and adjust pump output accordingly. This feedback control ensures the small pump delivers exactly the right amount of pressure needed, avoiding energy waste while maintaining sufficient down pressure for heavy materials.
3Reliability
If the feed roller force system is always on to ensure continuous feeding, then feeding reliability is high, but energy consumption increases
Solution Approach 1:
The hydraulic feed control system operates periodically rather than continuously, activating only when feeding conditions require intervention. The system monitors material flow and applies hydraulic force selectively during critical moments, maintaining feeding reliability while minimizing energy consumption during normal autonomous operation.
Solution Approach 2:
The system incorporates automatic mode operation where the chipper autonomously regulates feed roller force based on detected material conditions. This self-service capability eliminates the need for continuous manual or powered intervention, maintaining reliable feeding through intelligent control while reducing energy consumption.
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
This solution enables the chipper to effectively pull large, heavy tree trunks into the chipper, optimizing feeding characteristics and minimizing hydraulic inefficiency by using a smaller pump for maintaining desired down pressure and allowing for manual control to overcome jams.
Implementation Method 1
hydraulic fluid from a pump that is independent from a feed roller drive pump is used to effectively and efficiently apply an appropriate force between feed rollers
Data Source
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AI summary
A feed system that is configured to more effectively grab and pull brush and tree materials into a chipper is provided. The system of the present disclosure is configured such that a large, heavy tree trunk can be effectively pulled into the chipper. The system includes a hydraulic pump that applies variable down pressure on a feed roller.