Precautions for use of centrifugal pumps 1. Preparation before starting up In order to ensure the safe operation of the pump, the necessary checks should be made before starting the machine: firstly turn the coupling or pulley slowly, observe whether the pump is turning correctly, whether the rota ......
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Since both the fluorite and calcite minerals contain Ca 2+ cations, they can be floated with fatty acid anion collectors , and calcite inhibitors also inhibit fluorite. For clearly defined standards of content of fluorspar concentrate CaC0 3, the premium, one, two, three fluorite concentrate CaC0 3 ......
1 Overview of the automatic dustproof device before use Xuzhuang coal mine for the low-gas coal mine, coal dust is a strong burst of coal dust, coal dust prevention and control work has been a top priority of mine safety work xuzhuang. In recent years, in order to meet the development needs of mode ......
The vortex flowmeter can only measure one-way. When installing, pay attention to ensure that the direction of the medium flow is consistent with the direction indicated by the arrow of the flowmeter. 2. The vortex flowmeter 1 is installed vertically. The medium passes through the flow meter from bo ......
A few days ago, CUCH released the TOP10 data on the SUV market in March. There was little change in the short-listed models. The Haval H6 snatched the championship that Po Chun had won last month. However, the data is not much different from Baojun 510, which shows the future championship battle. ......
By using the “torque-power angle self-balancing†characteristic of the motor, a single-current-loop closed-loop start of the motor and a smooth switching of the position-sensorless control based on the sliding mode observer to the sliding mode observer are realized. At the same time, t ......
Zhao Xia, Yang Lun, Yan Xiaobin, and Yan Wei, researchers of the State Key Laboratory of Power Transmission and Distribution Equipment and System Safety and New Technologies (Chongqing University), wrote in the 3rd issue of the Journal of Electrotechnics in 2018 that the integrated energy system U ......
The heavy-duty heavy-duty semi-trailer heavy-duty drive refers to the actual driving after the semi-trailer is loaded. Heavy semi-trailer driving is not easy, not only requires a lot of physical strength, but also has a high demand for lightweight high-bar semi-trailer driving skills. Because of t ......
On the morning of March 10, the third press conference of the 13th session of the National Committee of the Chinese People's Political Consultative Conference was held. The theme of the meeting was "The CPPCC members talked about improving security and improving people's livelihood.&qu ......
The automatic booster pump is divided into several types according to different types of automatic switches. Different types of adjustment pressure methods are slightly different: Spring pressure switch: This kind of pressure switch is the most primitive, and it mainly uses the pressure generated ......