Abrasive Flow Sensing for Closed-Loop Waterjet Feed Control
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Solution Overview
Problem
Existing methods for estimating and controlling abrasive material flow in liquid jet cutting systems are inaccurate and require time-consuming manual sampling, leading to inefficiencies and potential operational issues.
Innovation Solution
A system and method for measuring abrasive flow rates using sensor assemblies positioned within or outside a conduit, calculating flow rates based on the time taken for a column of abrasive to pass between sensors, and adjusting operating parameters in a closed-loop configuration to maintain desired flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual sampling method is used to measure abrasive flow rate, then measurement can be performed with simple equipment, but measurement precision and reliability are insufficient
Solution Approach 1:
The patent replaces manual mechanical sampling and weighing with optical sensing systems. Sensors detect the passage of abrasive material through the conduit by monitoring changes in light transmission or reflection, automatically calculating flow rates without physical intervention. This substitution of mechanical measurement with optical detection resolves the contradiction by providing precise automated measurement while keeping the overall system relatively simple.
Solution Approach 2:
The patent introduces an intermediary measurement chamber or section with sensors that detect abrasive flow characteristics. This intermediary zone allows for non-intrusive measurement of the abrasive stream using optical, capacitive, or other sensing methods, enabling accurate flow rate determination without directly interfering with the main abrasive delivery system.
2Productivity
If simulated cutting mode sampling is used, then equipment operation is simplified, but time consumption increases due to manual collection and weighing
Solution Approach 1:
The patent enables continuous automated measurement of abrasive flow rates during normal system operation. Sensors continuously monitor the abrasive stream, and the control system continuously calculates flow rates, eliminating the need to stop production for manual sampling. This continuous measurement approach maintains productive action while eliminating time losses associated with manual measurement procedures.
Solution Approach 2:
The measurement system performs self-service by automatically detecting abrasive flow, calculating rates, and providing feedback without requiring manual intervention. The sensors and control system work autonomously to measure and monitor flow rates, freeing operators from time-consuming manual sampling and weighing tasks while maintaining measurement capability.
3Reliability
If no real-time measurement is implemented, then system operation is simpler, but abrasive consumption control and cut quality consistency deteriorate
Solution Approach 1:
The patent implements feedback control where sensors continuously measure abrasive flow rates and provide real-time data to the control system. The control system uses this feedback to automatically adjust abrasive delivery parameters, ensuring consistent flow rates and thereby consistent cut quality. This feedback loop resolves the contradiction by providing reliable quality control through automated real-time monitoring and adjustment.
Solution Approach 2:
The patent replaces manual monitoring and adjustment procedures with automated optical or electronic sensing systems. These sensors detect flow rate variations and trigger automatic control responses, eliminating the need for manual intervention while ensuring consistent cut quality. The substitution of mechanical/manual processes with automated sensing and control resolves the contradiction between reliability and device complexity.
4Productivity
If manual measurement procedures are used, then equipment cost is lower, but operational efficiency and abrasive consumption optimization are reduced
Solution Approach 1:
The patent implements feedback control where real-time measurement data is used to automatically optimize abrasive consumption. The control system adjusts delivery parameters based on measured flow rates to maintain optimal efficiency, preventing both under-delivery (which reduces productivity) and over-delivery (which wastes abrasive). This feedback mechanism resolves the contradiction by optimizing the balance between productivity and material consumption.
Solution Approach 2:
The system performs self-optimization of abrasive consumption through automated sensing and control. The measurement system continuously monitors flow rates and the control system automatically adjusts parameters to maintain optimal efficiency without manual intervention. This self-service capability enables the system to optimize productivity while minimizing abrasive consumption, resolving the contradiction between operational efficiency and material usage.
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
Enables accurate, real-time control of abrasive flow, reducing the need for manual measurements, optimizing cutting processes, and minimizing abrasive consumption while ensuring consistent cut quality and system reliability.
Implementation Method 1
sensors spaced apart at fixed, known distances adjacent the conduit... sensors can be positioned outside the conduit or within the conduit
Implementation Method 2
sensors spaced apart at fixed, known distances adjacent the conduit... detecting a top surface of the column of abrasive material
Data Source
AI summary
The present disclosure relates to abrasive material delivery systems for liquid jet cutting systems. The abrasive material delivery systems can include a valve configured to adjust an inflow of abrasive material into the abrasive material delivery system from a source of abrasive material. The systems can include a chamber downstream of the valve and configured to receive the inflow of abrasive material from the valve. The systems can include a metering component configured to control an outflow of abrasive from the chamber to a cutting head of the liquid jet cutting system. In some embodiments, the systems include a sensor configured to monitor movement of a top surface of a portion of abrasive material within the chamber as the top surface moves through the chamber; and a processing device operably connected to the sensor and configured to determine an abrasive flow rate through the metering component based on a speed of the top surface as monitored by the sensor.