Today, I will introduce a national invention authorized patent-a flow metering device for paste conveying pipeline. The patent was applied for by Hebei University of Engineering, and the authorization was announced on December 14, 2016.
Content descriptionThe utility model belongs to a flow metering device for a coal gangue filling transportation pipeline, in particular to a flow metering device for a paste transportation pipeline.
Background of the inventionAt present, the method of measuring the flow rate of filling pipes is mainly the method of detecting radioactive elements. Due to its radioactivity, this method poses a threat to the underground filling environment and the health of the staff, and it has limitations in wide-scale promotion. Other flow detection methods are still immature in the experimental research stage, and a feasible, low-cost, and large-scale flow detection device that can be used in filling systems is needed.
Summary of the inventionExisting pipe-filled flow metering devices have high requirements for installation environment, and general measurement devices have harsh installation requirements, which makes it impossible to guarantee the accuracy of the flow rate measurement of the transportation pipeline; at the same time, they have limitations and incompatibility in use.
This device uses the Doppler effect of the flow of the transmission pipeline on the light, and measures the flow of the pipeline according to the Doppler shift difference when the light propagates in the optical fiber. The method has the characteristics of high measurement accuracy and small error, and can realize the flow measurement of the gangue gypsum transport pipeline. According to the principle of optical Doppler frequency shift. When the incident light emitted by a light source that is stationary relative to the paste enters the flowing paste, the light will meet the solid particles during the propagation process. Because of the relative motion between the light source and the scattering particles, the light received by the particles will be the first At the same time, each paste will become the scattering center, the light will be scattered by the paste particles, the detector is relatively stationary with the paste tube, and the received scattered light will undergo a second frequency shift.
A flow metering device for a paste conveying pipeline is mainly composed of a laser, an optical fiber, a coupler, a transmitting probe, a receiving probe, a photoelectric detection circuit, a voltage amplifier circuit, a low-frequency filter circuit, an analog-to-digital converter and a spectrum analysis unit; the laser is connected and coupled The two output ends of coupler 1 are connected to the transmitting probe and the input end of coupler 2, and the two output ends of coupler 2 are respectively connected to the receiving probe and the photoelectric detection circuit. After the photoelectric detection circuit, there is a voltage connected in turn. Amplification circuit, low frequency filter circuit, analog-to-digital converter and spectrum analysis unit.
The main working principle of the sensor is that the laser emitted by the laser is divided into two ways, one of which is received by the receiving probe through the transmitting probe through the optical fiber in the pipeline, and the received light signal is the light signal carrying the paste flow information. The light signal passes through the photodetector PIN. The light signal is converted into photocurrent; the weak photocurrent is converted into voltage by the photoelectric detection circuit and amplified by the voltage amplifier circuit; the voltage of the previous stage is amplified to the volt level; the high voltage in the circuit is filtered by the low frequency filter circuit. Frequency interference signal and noise; The signal is converted into a digital signal by an analog-to-digital converter; Finally, the signal is processed by a spectrum analysis unit to obtain frequency information, and finally the filling pipeline flow rate is calculated.
The device has good versatility, can be applied to the flow measurement of all coal mine filling and transportation pipelines, and has the advantages of real-time monitoring of the flow, high accuracy, and convenient installation. Applying this device to the filling pipeline can accurately measure the filling flow.
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