Ultrasonic flowmeters, under the premise of fixed installation conditions, improve the signal processing capability and diagnostic capability of the flowmeter itself, which can effectively reduce noise. Under normal conditions, the measurement accuracy of the flow meter is very important. If the accuracy cannot be guaranteed, the application of a flow meter to measure the flow of a noise-producing regulator valve will inevitably produce erroneous results. Therefore, improving the flowmeter's identification and detection of acoustic pulses, while improving the signal filtering capability, can improve the accuracy of the measurement.
In order to reduce noise interference, the flowmeter should be installed upstream of the regulating valve. The advantage is that the pressure is higher and the signal is stronger. It will not amplify the noise. Lengthening the upstream and downstream straight sections of the flowmeter and installing isolation devices between the flowmeter and the noise source will reduce noise. However, the length of the straight pipe may need multiple pipe diameters to reduce noise interference. Therefore, installing isolation equipment is more convenient and effective. Experiments show that filters, heat exchangers and turbine equipment are all good noise-reducing devices. Ultrasonic flow meter elbows and blind tees can also reduce noise. The best way is to install a blind tee. After the fluid passes through the blind tee, the noise is reflected back. The use of two valves to share the pressure drop also reduces noise, but it is usually more costly.
Ultrasonic noise reducer has a significant noise reduction effect. Denoisers use a single composite reflective device with the same wavelength as the flowmeter, foam or some viscous, elastic, absorbent devices to eliminate noise. Tests show that this method can reduce 30% of the noise. The noise reducer can be installed directly downstream of the flowmeter. The flange connection will not affect the accuracy of the flowmeter. Ultrasonic noise dampers usually block and have a certain pressure drop, so they lose some of their advantages. However, in some cases, the pressure drop of the noise reducer is negligible compared with the noise caused by the larger pressure drop of the regulating valve. Ultrasonic flow meters can use noise reducers to reduce noise in space-constrained situations such as offshore platforms.
Welded mesh is mainly used on the surface of the rock layer to prevent the rock from falling after being broken. The welded mesh is linked with a large number of bolts to form an integrated support system, which greatly improves the safety of the mine.
ANTO welded wire mesh is made of high-strength steel wire, welded by high-frequency welding machines. the welding are not easy to crack.
In coal mine roadway support,coal mine steel mesh is used in combination with steel mesh, bolts and joists,to form an integral bearing structure with bolts as the mainstay. It can increase the bearing area of the bolts, prevent small turquoises from falling between the bolts, greatly improve the overall supporting performance of the bolt system, and make it possible to apply the bolt support to the conditions where the roof is relatively broken or the joints and cracks are developed. And in the roadway affected by mining. Moreover, it can also be used in the case of a large roadway width, thereby significantly improving the supporting effect of the bolt and further expanding the application range of the bolt supporting.
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