Pneumatic Distributor Torque-Based Mass Flow Control
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Solution Overview
Problem
Pneumatic distribution machines face challenges in accurately regulating the mass flow of powdery and particulate materials due to errors in sensory detection of actual mass flow, leading to distribution errors and the need for complex calibration tests, which are time-consuming and prone to errors.
Innovation Solution
The method involves using the torque of a rotor in the pneumatic conveying system as a controlled variable, determined by sensors and transmitted to a control device, which calculates the actual mass flow based on a stored functional relationship between torque and mass flow to adjust the metering element to a target mass flow, eliminating the need for calibration tests and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensory detection methods are used to measure actual mass flow, then mass flow control is enabled, but detection precision is insufficient leading to distribution errors
Solution Approach 1:
The patent replaces optical or electromagnetic sensory detection systems with a mechanical measurement approach. A rotor with blades is positioned in the material flow path, and the torque required to rotate the rotor at a constant speed is measured. This mechanical torque measurement is directly proportional to the mass flow rate, providing more reliable and precise detection compared to sensory methods. The mechanical system converts the mass flow directly into a measurable physical quantity (torque) that has a clear linear relationship with flow rate.
2Reliability
If calibration tests are performed to correct detection errors, then distribution accuracy is improved, but time consumption and operational complexity increase
Solution Approach 1:
The rotor-based measurement system is inherently self-calibrating and material-independent. The torque measurement automatically adapts to different material properties (density, particle size, flow characteristics) because the rotor operates directly within the material stream. The system continuously measures actual mass flow in real-time operation without requiring separate calibration procedures. The control device uses the raw torque signal directly to regulate the dosing element, eliminating the need for time-consuming calibration tests while maintaining high distribution accuracy across different materials.
3Measurement precision
If complex calibration procedures are implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the measurement function from complex calibration systems and simplifies it to a fundamental mechanical principle. Instead of using sophisticated sensors requiring calibration against known standards, the system uses a rotor whose torque measurement directly reflects mass flow. The relationship between torque and mass flow is physically inherent and does not require external calibration references. This extraction of the essential measurement function reduces device complexity while maintaining or improving measurement precision.
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
This approach provides precise and automatic mass flow control, independent of the type of material, allowing for real-time adjustments during operation, reducing errors, and eliminating the need for calibration tests, thus enhancing operational efficiency and accuracy.
Implementation Method 1
The rotor (21) is subjected to a material flow (M) to be measured in order to generate a torque (MR) representative of an actual mass flow of the material flow (M)
Implementation Method 2
at least one blower (4) for applying an air flow to the at least one conveying line (6) of the pneumatic conveying system
Data Source
Figure 1~2
Figure 3
Figure 4A
AI summary
A method for controlling the mass flow rate of the metering elements (17) of a pneumatic distribution machine is proposed. In this method, a target mass flow rate of the metering element is input to or determined by a control unit. Simultaneously, the torque of a rotor (21) in the pneumatic conveying system of the distribution machine, representative of the actual mass flow rate of the metering element, is measured by sensors and transmitted to the control unit. The actual mass flow rate of the metering element is then determined based on a functional relationship stored in the control unit between the rotor torque and the mass flow rate of the metering element acting upon it. Subsequently, the deviation of the actual mass flow rate from the target mass flow rate of the metering element is determined, and a manipulated variable representative of the operating state of the metering element is generated to readjust the metering element to the target mass flow rate.The invention further relates to a pneumatic distribution machine suitable for carrying out such a method.