First, the electromagnetic flowmeter structure The electromagnetic flowmeter's structure mainly by the magnetic circuit system, the measurement catheter, the electrode, the shell, the lining and the converter and so on the composition.
Second, the principle of electromagnetic flowmeter
1. Magnetic flowmeter magnetic circuit system: Its role is to produce a uniform DC or AC magnetic field. The DC magnetic circuit is realized by a permanent magnet. The advantage is that the structure is relatively simple and less disturbed by the AC magnetic field, but it is easy to polarize the electrolyte liquid in the measurement conduit so that the positive electrode is surrounded by negative ions and the negative electrode is positive ions. Enveloping, that is, the polarization phenomenon of the electrode, and the internal resistance of the two electrodes will increase, which will seriously affect the normal operation of the instrument. When the pipe diameter is larger, the permanent magnet is also relatively large, heavy and uneconomical, so the electromagnetic flowmeter generally uses an alternating magnetic field, and is generated by 50HZ power frequency power supply excitation.
2, electromagnetic flowmeter measuring catheter: Its role is to allow the measured conductive liquid through. In order to make the magnetic flux to be diverted or short-circuited when passing through the measuring tube, the measuring tube must be made of non-magnetic material, low conductivity, low thermal conductivity, and a certain mechanical strength. Stainless steel, glass fiber reinforced plastic, high strength without magnetic permeability Plastic, aluminum and so on.
3, electromagnetic flowmeter electrode: Its role is to lead out and be measured in proportion to the induced potential signal. The electrodes are generally made of non-magnetic stainless steel and are required to be flush with the lining so that the fluid passes unimpeded. Its installation position should be in the vertical direction of the pipeline to prevent deposits from accumulating on it and affect the measurement accuracy.
4. Magnetic flowmeter lining: There is a complete electrical insulating lining on the inside of the measuring conduit and the flange sealing surface. It is in direct contact with the liquid to be measured. Its role is to increase the corrosion resistance of the measuring tube and prevent the induced potential from being short-circuited by the metal measuring tube wall. Lining materials are mostly corrosion-resistant, high-temperature resistant, wear-resistant polytetrafluoroethylene plastics, ceramics and so on.
5, electromagnetic flowmeter converter: The induced potential signal generated by the liquid flow is very weak, affected by a variety of interference factors, the role of the converter is to amplify and convert the induced potential signal into a unified standard signal and suppress the main Interference signal. Its task is to amplify the induced potential signal Ex detected by the electrode into a uniform standard DC signal.
The main components of Shine Core Veneer Dryer is as follows:1.Drying system :the Veneer Dryer adopts the most scientific drying principle ,and the hot air in the hot air stove is injected directly into the upper and lower bellows of the machine by centrifugal blower. The hot air blows to the upper and lower sides of the running veneer through the nozzles of the upper and lower bellows, so that the veneer is heated evenly and thus plays the role of drying 2.Control system: Adopt endless gearbox to adjust feed speed according to your veneer thickness and moisture content to achieve ideal drying effect. 3.Transmission system :the veneer is fed into the machine through the feed inlet vertically, and the chain drives the upper and lower rows of rollers, running relatively. The veneer moves forward by the self-weight pressure of the upper roll, and during the veneer passes through the two rollers and the upper and lower air nozzles, it achieves the effect of drying and ironing. So the veneer dried by this machine is flat, smooth and without marks. 4.Heating system:Steam heating, heat conduction oil heating, hot stove type heating,waste wood or other biomass materials. Users can choose one most suitable model. but biomass fuel is the most economic one which can save the drying cost to the user to the most .
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