Compressor Control for Pneumatic Tool Pressure-Loss Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drilling devices face pressure losses that result in suboptimal operation of pneumatic tools due to unknown and potentially damaging air pressure at the tool location, leading to reduced drilling efficiency and potential damage.
Innovation Solution
A method for controlling the compressor that regulates the operating pressure and flow rate to ensure the pneumatic tool never exceeds its maximum allowed pressure and consumption, using a control unit to manage pressure and flow rate adjustments based on predetermined values and safety margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operating pressure set point of the compressor is equated to the maximum pressure of the drilling hammer, then the drilling hammer is protected from damage, but the drilling hammer will never operate at its optimum power or drilling speed due to pressure losses
Solution Approach 1:
The system implements feedback control by continuously monitoring the actual pressure at the drilling hammer location (via pressure sensors in the drilling rod) and using this information to dynamically adjust the compressor's operating pressure set point. This allows the system to compensate for pressure losses in real-time, ensuring the drilling hammer receives its optimal pressure while remaining protected from excessive pressure damage.
Solution Approach 2:
The operating pressure set point of the compressor is made dynamic rather than static. The control unit continuously adjusts the set point based on the measured actual pressure at the drilling hammer, allowing the system to adapt to changing conditions such as varying pressure losses, drilling depth, and rod extensions. This dynamic adjustment enables optimal drilling performance while maintaining safety margins.
2Length of moving object
If the drilling rod is extended to drill deeper into the ground, then the drilling depth is increased, but additional pressure losses occur that further reduce the pressure at the drilling hammer
Solution Approach 1:
The system performs preliminary action by proactively adjusting the compressor's operating pressure set point in anticipation of pressure losses. When the drilling rod is extended or pressure losses increase, the control unit detects this and automatically increases the set point before the pressure at the drilling hammer drops below optimal levels. This prevents the need for reactive adjustments and maintains continuous optimal performance.
3Stress or pressure
If the compressor supplies higher pressure to compensate for pressure losses, then the pressure at the drilling hammer can be maintained, but the drilling hammer may be exposed to damaging pressure levels
Solution Approach 1:
The feedback control mechanism continuously monitors the actual pressure at the drilling hammer and uses this information to precisely regulate the compressor output. The control unit compares the measured pressure with the desired pressure and adjusts the operating set point accordingly, ensuring the drilling hammer receives exactly the pressure it needs without exceeding safety limits. This closed-loop control eliminates the need for over-compensation.
Data Source
AI summary
Method for controlling a compressor which drives a pneumatic tool, with a maximum allowed pressure (p_max) and an associated compressed air consumption (q_max). The method includes the step of regulating the operating pressure (p_compr) of the compressor, and: if the operating pressure (p_compr) is lower than p_max minus a value (Z), controlling the compressor such that the flow rate supplied by the compressor is not limited; and if the operating pressure (p_compr) is higher than or equal to p_max, controlling the compressor such that the flow rate supplied by the compressor does not exceed the compressed air consumption (q_max) at p_max; and if the operating pressure (p_compr) is higher than p_max minus the value (Z) and is lower than p_max, controlling the compressor such that the operating pressure (p_compr) remains lower than p_max.