Pump purchase: In recent years, with the adjustment of agricultural structure, farmers make full use of low mountain slope and wasteland resources, large-scale development of efficient agriculture, but these plots are often difficult to run-off irrigation. Need to buy water pumps for irrigation. So, how to choose a suitable agricultural water pump has become a peasant friends need to solve a problem? The following tips for peasant friends for reference. First, according to local conditions to buy pumps. Commonly used agricultural pumps have three types, namely centrifugal pumps, axial pumps and Francis pumps. Centrifugal pump higher head, but the water is not large, suitable for mountain and well irrigation area; axial pump large amount of water, but the lift is not too high, suitable for use in plain areas; Francis pump water and head lift between the centrifugal pump And axial flow pump, suitable for plain and hilly areas. Users should according to the local conditions, water and water to buy height. Second, we must properly exceed the election pump. After determining the type of pump, to consider its economic performance, with particular attention to the pump head and flow and the choice of supporting power. It must be noted that there is a difference between the head (total head) indicated on the pump label and the head of water (actual head) when it is used, as there is a certain loss of resistance when the water flows through the pipe and the pipe. Therefore, the actual head is generally 10% -20% lower than the total head, the amount of water is also reduced accordingly. Therefore, the actual use, only by the signs of the head and flow rate of 80% to 90% estimated that the pump supporting the power of choice, according to the signs indicated on the power of choice, in order to make the pump start quickly and use safety, power machine Power can be slightly larger than the pump power required, generally higher than about 10% is appropriate; if there is power, when purchasing a pump, you can press the power of the power machine to buy matching pump. Third, we must strictly purchase water pumps. When purchasing a pump to be tested "three cards", that is, agricultural machinery to promote permits, production permits and product inspection certificate, only three cards all can avoid the purchase of obsolete products and inferior products. Use and maintenance of the pump: Farmers buy the pump, how to use the pump to maximize the effectiveness of it? If the use of unreasonable will shorten the life of the pump, so the correct use of the method is to extend the pump life, reduce economic losses, an important factor. First, for the submersible pump, start before doing some necessary checks: the rotation of the pump shaft is normal, there is no stuck phenomenon; impeller position is normal; cable and cable plug without rupture, abrasions and broken phenomenon . Operation should pay attention to observe the voltage changes, the general control of the rated voltage within ± 5%. In addition, the location of the pump in the water is very important, should be selected as much as possible in the water volume, non-silt, good water quality, vertical suspension in the water, not allowed to cross, so as not to fall into the mud or suspended matter blocked by the pump imports, and Lead to sharp drop in water or even pumping to the water. Second, for the self-priming pump, should be placed in a well ventilated place to run, in order to facilitate rapid cooling, reduce the motor temperature. Otherwise, prolonged operation, easy to burn the motor. If a farmer is using a self-priming pump, the motor is overheated and the coil burned out because the plastic film covering the motor is not removed. In addition, before starting, be sure to check the pump body of water, otherwise, not only affect the self-priming performance, but also easy to burn shaft seal components. Under normal circumstances, 3-5 minutes after the pump starts water should be, or should immediately stop checking. Third, when the pump fails, should not disassemble yourself. Because of their demolition, I do not know where the fault is caused by blindly dismantling a pass; Second, there is no special tools and often damage the original parts intact. The best way is to have the experience, the maintenance of scale maintenance, and timely replacement of "over age" parts and some wearing parts. Under normal circumstances, the pump should be repaired once every six months, to eliminate "sick" work. Fourth, in non-use period, the pump should be promptly removed from the water, and empty the pump water, especially in the cold winter. Then place it in a dry place, conditional users can also apply butter in the key parts of the pump, add lubricant to the bearings to prevent corrosion of parts. In addition, the non-use of the pump, not the longer the better. If you do not use for a long time, not only easy to rust parts, but also reduce the service life of the pump.
Friction Welding Machine is used for welding of homogeneous metals or different metals, which are connected by the friction welding with heat. The two work pieces are rubbed together with mechanical rotary motion and axial pressure (friction pressure). Heat will be generated during that course and the working pieces will be then heated to plastic state. The rotary motion will then stop and the machine will place a greater pressure (forge force) on the pieces at a certain duration. As result, the contact surface of work pieces will be connected.
Due to its advanced technology, stable quality and reliable performance, friction welding machine is widely used in aerospace, electric power, bearing, automobile, motorcycle, metal cutting tool, textile machinery, petroleum geological drilling, construction and other high-tech and traditional industries.
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