A cutting machine is a specialised, often hand-held, power Tool used for cutting hard materials, ceramic tile, metal, concrete, and stone for example. This tool is very similar to an angle grinder, chop saw, or even a die grinder, with the main difference being the Cutting Disc itself (a circular diamond blade, or resin-bonded abrasive cutting wheel for a disc cutter vs. an abrasive grinding wheel for an angle grinder). This tool is highly efficient at cutting very hard materials, especially when compared to Hand Tools.
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Pump selection principles and procedures
Pumps are widely used in a wide range of general-purpose machinery and equipment, which is widely used in petroleum, chemical, power metallurgy, mining, ship selection, light industry, agriculture, civil and defense departments in the national economy Occupies an important position. Vigorously reduce the pump energy consumption, the use of energy conservation is of great significance. How to choose that can be the pump you want? Xiaobian tell you, the principles and steps of pump selection. Selection of pumps First, the principle of selection Currently in all areas of the national economy, due to the selection is not reasonable, many of the pumps in an unreasonable operating conditions, low operating efficiency, wasting a lot of energy. Some pump because the selection is not reasonable, can not be used, or the use of maintenance costs increase, low economic benefits. Thus it can be seen that the rational selection of pumps is also of great significance for saving energy. The so-called rational selection of pumps, is to comprehensively consider the pump unit and pumping station investment and operating costs and other comprehensive technical and economic indicators, to make it in line with economic, security and applicable principles. Specifically, the following aspects must be met: 1. Flow and lift requirements must be met, ie, the point of operation of the pump (the point of intersection of the device characteristic curve with the pump performance curve) is often maintained in an efficient range so that Provincial power is not easy to damage the parts. 2. The selected pump should not only small size, light weight, low cost, but also have good characteristics and high efficiency. 3. Has good anti-cavitation performance, so that both to reduce the depth of excavation of the pump room, but also to pump cavitation, smooth operation, long life. 4. According to the selected pump built pumping station, less investment, low operating costs. Second, the selection step a), lists the basic data: 1, the characteristics of the media: media name, specific gravity, viscosity, corrosion, toxicity and so on. 2, contained in the media due to the body particle diameter, content how much. 3, the medium temperature: (℃) 4, the required flow, the general industrial pump in the process can be ignored in the pipeline leakage, but must consider the impact of process changes on the flow. Agricultural pumps if the use of open channel water, but also must consider the leakage and evaporation. 5, pressure: suction tank pressure, drainage tank pressure, pressure drop in the piping system (head loss). 6, the piping system data (diameter, length, type and number of pipe fittings, water tank to the pressure tank geometric elevation, etc.). B) If necessary, plant characteristics should also be made. In the design and layout of the pipeline, should pay attention to the following: A, a reasonable choice of pipe diameter, pipe diameter, the same flow, the flow velocity is small, the resistance loss is small, but the price is high, the pipe diameter is small, will lead to a sharp increase in resistance loss Large, so that the selected pump lift, with increased power costs and operating costs have increased. Therefore, it should be considered technically and economically. B, discharge pipe and its fittings should consider the maximum pressure that can bear. C, pipe layout should be arranged as straight pipe, pipe fittings to minimize and minimize the length of the pipeline, you must turn when bending the elbow bend radius should be 3 to 5 times the pipe diameter, the angle is greater than 90 ℃. D, the discharge side of the pump must be installed valves (ball valve or globe valve, etc.) and check valve. The valve is used to adjust the operating conditions of the pump. The check valve prevents the pump from reversing when the fluid is flowing backwards and prevents the pump from hitting the water hammer. (When the liquid back, it will have a huge reverse pressure, so that the pump damage) Third, to determine the flow, head a, if the production process has been given the smallest, normal, maximum flow, should be considered the maximum flow. b, if the production process is only given normal flow, should consider leaving a certain margin. For ns> 100 large low-flow pump with its head, the flow margin taken 5%, ns c, if the basic data only to the weight flow, should be converted into volume flow. Further Reading: pump valve pipe fittings Exhibition Water Expo Xiamen exhibition of marine equipment Internet + Forum Yiwu Fair 2016 exhibition mold top ten brands of the Internet information industry (Xiamen) Technology Co., Ltd. Author: Asian pumps Network Editor: Yao Xiaoxia (QQ / WeChat:) http://beng.liuti.cn/ (Service Hotline:)