Hydraulic Flow Sensing for Precise Milling Machine Frame Height
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Solution Overview
Problem
Existing milling machines face challenges in accurately determining the height and orientation of their frames relative to the ground surface, as external sensors like ultrasonic grade sensors lack precision and require inconvenient setup, while proximity sensors can only position the frame at discrete heights.
Innovation Solution
A milling machine equipped with a fluid flow based height measurement system, featuring hydraulic actuators, flow sensors, and a controller that determines the frame's height based on hydraulic fluid flow parameters, allowing for precise adjustment and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external ultrasonic sensors are used to determine frame height, then height measurement capability is provided, but measurement precision is insufficient and device complexity increases due to additional connections
Solution Approach 1:
The flow sensor is integrated into the existing hydraulic fluid conduit that connects the hydraulic reservoir to the actuator, merging the measurement function with the existing hydraulic system infrastructure. This eliminates the need for separate external sensor installations and complex wiring connections while achieving precise height measurement through flow parameter monitoring
Solution Approach 2:
The hydraulic fluid itself serves as an intermediary carrier of height information. By measuring flow parameters (pressure, flow rate) of the hydraulic fluid in the conduit, the system indirectly determines frame height without requiring direct physical contact sensors on the frame, thus simplifying the measurement system while maintaining precision
2Adaptability or versatility
If proximity sensors are mounted on leg columns to position the frame, then positioning capability is provided, but only discrete heights can be achieved and adaptability is reduced
Solution Approach 1:
The system transitions from static discrete positioning (proximity sensors at fixed locations) to dynamic continuous positioning. The flow sensor continuously monitors hydraulic fluid parameters during actuator movement, enabling the frame to be positioned at any height within the actuator's range of motion, not just at predetermined discrete levels
Solution Approach 2:
The system uses changes in hydraulic fluid flow parameters (pressure, flow rate) as the actuator moves to different positions. By monitoring these parameter changes in real-time, the system can determine the exact frame height at any point during adjustment, enabling continuous rather than discrete positioning
3Measurement precision
If hydraulic actuators with flow sensors are used to adjust frame height, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The hydraulic fluid conduit serves multiple functions: it transports hydraulic fluid to power the actuator AND simultaneously serves as the sensing pathway for height measurement. The same hydraulic infrastructure that enables movement also provides the measurement capability, eliminating the need for separate sensing systems and reducing overall device complexity
Solution Approach 2:
The hydraulic system serves itself by using its own fluid and conduits for both actuation and measurement purposes. The flow sensor leverages the existing hydraulic fluid flow that is already present in the system for actuator operation, converting this necessary operational flow into a useful measurement signal without requiring additional fluid pathways or separate measurement 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 system enables accurate and flexible positioning of the milling machine frame at any desired height and orientation, improving operational efficiency and accuracy compared to traditional sensing methods.
Implementation Method 1
a flow sensor disposed in the fluid conduit. The flow sensor may be configured to determine a flow parameter associated with a flow of the hydraulic fluid into or out of the at least one actuator
Data Source
AI summary
A milling machine may have a frame, a milling drum attached to the frame, and ground engaging tracks that support the frame and propel the milling machine in a forward or rearward direction. The milling machine may have a tank that stores hydraulic fluid. The milling machine may also have at least one actuator connecting the frame to the tracks. The actuator may adjust a height of the frame relative to a ground surface. A fluid conduit may connect the tank to the actuator. The milling machine may have a flow sensor in the fluid conduit. The flow sensor may determine a flow parameter associated with a flow of the hydraulic fluid into or out of the actuator. The milling machine may also have a controller that determines a height of the frame relative to the ground surface based on the flow parameter.