Servo Coolant Pump Control for CNC Flow Anomaly Detection
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Solution Overview
Problem
Conventional coolant pumps in CNC machines are inefficient, consuming excess energy, prone to wear due to frequent switching, and unable to detect low coolant levels or flow issues, leading to potential damage to parts and tools.
Innovation Solution
A smart coolant pump utilizing a servo motor with integrated torque and speed sensing, coupled with a controller that adjusts speed and flow rate based on real-time coolant requirements, enabling early detection of anomalies and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple coolant pump is used that is either on or off depending on the operation, then the device complexity is reduced, but the energy consumption increases and the pump wear increases due to frequent switching
Solution Approach 1:
The patent applies dynamics by transitioning from a static on/off pump control system to a dynamic variable speed control system. The smart pump controller continuously adjusts the pump speed based on real-time coolant flow requirements detected by sensors, enabling the pump to operate at optimal speeds for different machining operations rather than switching completely on or off. This dynamic adjustment reduces energy consumption while maintaining adequate coolant supply.
Solution Approach 2:
The patent implements feedback control by using coolant flow sensors and pressure sensors to continuously monitor the actual coolant delivery conditions. This feedback information is fed back to the smart pump controller, which automatically adjusts the pump speed to maintain proper coolant flow to the machining zone. This closed-loop feedback system eliminates the need for frequent on/off switching and optimizes energy usage.
2Device complexity
If a simple coolant pump is used that is either on or off depending on the operation, then the device complexity is reduced, but the reliability decreases due to inability to detect low coolant level or flow blockage
Solution Approach 1:
The patent implements feedback control by using coolant flow sensors and pressure sensors to continuously monitor the actual coolant delivery conditions. This feedback information is fed back to the smart pump controller, which automatically adjusts the pump speed to maintain proper coolant flow to the machining zone. This closed-loop feedback system eliminates the need for frequent on/off switching and optimizes energy usage.
Solution Approach 2:
The smart coolant pump system performs self-diagnosis and self-protection by continuously monitoring its own operating parameters through integrated sensors. When abnormal conditions such as low coolant level or flow blockage are detected, the system automatically alerts the operator and can stop the machining operation to prevent damage, enabling the system to protect itself without external intervention.
3Device complexity
If a conventional constant-speed coolant pump is used, then the device complexity is reduced, but the productivity decreases due to unnecessary energy usage and inability to adjust to specific machining requirements
Solution Approach 1:
The patent applies dynamics by transitioning from a static on/off pump control system to a dynamic variable speed control system. The smart pump controller continuously adjusts the pump speed based on real-time coolant flow requirements detected by sensors, enabling the pump to operate at optimal speeds for different machining operations rather than switching completely on or off. This dynamic adjustment reduces energy consumption while maintaining adequate coolant supply.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the pump speed parameter based on the specific machining operation being performed. Different machining operations require different coolant flow rates, and the smart pump controller modifies the pump speed parameter in real-time to match these requirements, optimizing both productivity and energy efficiency for each specific operation.
Data Source
AI summary
A smart coolant pump for a robotic or computer-controlled machine. The smart pump uses a servo motor rather than a conventional industrial motor such as an induction motor. The smart pump has inherent torque and speed sensing, and a controller integrated with the computer-controlled machine controller. The motor torque/speed sensing and coolant pressure/flow sensing enable immediate detection of any anomalous conditions such as low coolant level or coolant port blockage. The smart pump can be configured to run at a certain speed and provide a specific coolant pressure and flow rate for each machining operation performed at the station, and to run at a very low speed between machining operations. This speed configurability saves energy and allows the pump and coolant to run at lower temperatures compared to conventional constant-speed coolant pumps.