Surface Treatment Machine Flow-Rate Control for Extended Range
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Solution Overview
Problem
Surface treatment machines with liquid treatment systems face challenges in accurately determining the residual liquid amount in the reservoir, leading to unpredictable treatment range and inefficient route planning, especially when liquid delivery is not constant due to factors like gravity feeding or pump sensitivity.
Innovation Solution
A surface treatment machine equipped with a flow-rate sensor and control unit that adjusts the liquid delivery through a piloted valve or pump to maintain a predetermined threshold flow-rate, displaying real-time residual range and allowing operators to optimize liquid supply based on selected parameters, ensuring consistent treatment efficiency and extended machine range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feeding duct section opening is adjusted to ensure sufficient liquid amount in unfavorable situations, then treatment effectiveness is improved, but machine range is reduced due to unsteadiness of flow-rate
Solution Approach 1:
A flow-rate sensor continuously measures the actual liquid flow-rate to the treatment element and provides feedback to a control unit. The control unit automatically adjusts the feeding duct section opening to maintain a predetermined threshold flow-rate, eliminating the need for manual conservative adjustments and ensuring both treatment effectiveness and maximum machine range.
Solution Approach 2:
The system dynamically changes the opening parameter of the feeding duct section based on real-time flow-rate measurements. By automatically adjusting this parameter to maintain a constant flow-rate, the system resolves the contradiction between ensuring sufficient liquid (requiring larger opening) and maximizing range (requiring smaller opening).
2Productivity
If the machine speed is increased to improve productivity, then treatment coverage per time is improved, but liquid supply becomes insufficient requiring feeding duct adjustment that reduces range
Solution Approach 1:
The flow-rate sensor detects changes in liquid supply caused by speed variations and provides feedback to the control unit. The control unit automatically adjusts the feeding duct opening to compensate for speed-related flow-rate changes, allowing the operator to maximize productivity without compromising range.
Solution Approach 2:
The system makes the feeding duct opening dynamic rather than static, automatically adapting to changing operating conditions including machine speed. This dynamic adjustment allows the system to maintain optimal flow-rate across varying speeds, resolving the contradiction between productivity and range.
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 solution enables precise control of liquid delivery, maximizing the machine's range by maintaining a constant flow-rate, optimizing treatment efficiency, and allowing operators to plan routes effectively without unnecessary replenishments, thus reducing operational costs and improving treatment coverage.
Implementation Method 1
a sensor configured to measure the liquid flow-rate traveling from the reservoir to the delivery mouth
Implementation Method 2
a control unit configured to set the adjustment element when the actual flow-rate diverges from the predetermined threshold flow-rate until the actual flow-rate reaches again said predetermined threshold flow-rate
Data Source
AI summary
A surface treatment machine, comprising a frame configured to translate with respect to a surface to treat, a surface treatment element connected to said frame and configured to treat with liquid a surface, a reservoir connected to the frame arranged to provide liquid to the surface treatment element through a delivery mouth; an adjustment element arranged to feed adjustably the liquid supplied from the reservoir to the delivery mouth. It is then provided a sensor configured to measure the flow-rate of the liquid from said reservoir towards the delivery mouth. A control unit receives from the sensor a signal proportional to the flow-rate for adjusting the adjustment element responsive to this value, in order to deliver the liquid with optimization of the flow-rate. It is possible then to maximize the range of the machine, and to optimize the working time of the operator.