Milling Machine Plunge Velocity Control via Surface Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Milling machines, such as cold planers and reclaimers, face challenges in controlling the plunge velocity when cutting through different materials, as plunging too quickly can cause damage, and the optimal rate depends on the depth of cut and material density.
Innovation Solution
Incorporating a density sensor, such as a ground penetrating radar sensor, to measure the surface density and a controller to adjust the plunge rate of the cutting rotor based on the measured density, ensuring a controlled and safe cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting rotor plunges quickly into the surface, then productivity increases, but the machine may be damaged due to excessive force on hard materials
Solution Approach 1:
The density sensor measures the surface material density before the cutting rotor plunges, allowing the control system to pre-determine the appropriate plunge velocity. This preliminary measurement enables the system to adjust the plunge rate in advance based on material properties, preventing machine damage while maintaining productivity.
Solution Approach 2:
The system uses a feedback loop where the density sensor continuously measures surface material density, the controller processes this information, and the plunge velocity is automatically adjusted accordingly. This closed-loop control ensures the plunge rate adapts to varying material conditions, balancing productivity and machine protection.
2Reliability
If the cutting rotor plunges slowly into the surface, then machine damage is prevented, but productivity decreases
Solution Approach 1:
The plunge velocity is made dynamic rather than fixed. The control system continuously adjusts the plunge rate based on real-time density measurements, allowing the machine to operate at higher velocities when materials are softer and at lower velocities when materials are harder, thereby optimizing both productivity and machine protection.
Solution Approach 2:
The system changes the operational parameter (plunge velocity) based on the measured material density. By adjusting this parameter dynamically according to material conditions, the system achieves high productivity on suitable materials while preventing damage on harder materials, resolving the contradiction between speed and safety.
3Device complexity
If the plunge rate is fixed, then the control system is simple, but it cannot adapt to varying material densities
Solution Approach 1:
The patent replaces complex mechanical adjustment mechanisms with an electronic sensing and control system. The density sensor and electronic controller automatically adjust plunge velocity based on material properties, providing adaptability without requiring complex mechanical linkages or manual intervention, thus maintaining relatively simple overall system design.
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 effectively manages the plunge rate of the cutting rotor, preventing machine damage by adjusting the velocity according to the material density, allowing for efficient cutting across varying surfaces.
Implementation Method 1
Incorporating a density sensor, such as a ground penetrating radar sensor, to measure the surface density
Data Source
AI summary
A milling machine can include a frame; a cutting rotor coupled to the frame, the cutting rotor configured to be lowered a selected distance into a surface; and a controller, the controller being configured to control a plunge rate of the cutting rotor into the surface based on a measured density of the surface.