In recent years, a number of new cogeneration units around the new generation to replace the original heating boiler, but some units are troubled by the pump to the pump trouble, similar to the pumping of water and other issues Seriously affected the safe power supply and heating. Below Asia Fluid Network Xiaobian boiler feed pump failure, combined with some expert data to give some analysis of countermeasures. Boiler feed pump pumping water? Trouble shooting and maintenance There is pressure on the pressure gauges of the coupé boiler feed pump, but still no water is mainly due to the resistance of the outlet pipe is too large, the rotation direction is wrong. Impeller clogged, boiler feed pump speed is not enough. Check or shorten the water pipe, check the motor. Clean the impeller to increase the speed of the boiler feed pump. Boiler feed pump flow is mainly due to pump damage, pipeline blockage or leakage caused. For the belt-driven boiler feed pump also consider whether due to belt slip caused by low speed caused by insufficient flow. After checking the belt to check the pipeline, the flow blockage is still inadequate leakage should consider whether the impeller damage. Check the impeller and bearings and other parts of the lubrication, to avoid poor lubrication due to poor lubrication or damage caused by insufficient flow. Boiler feed pump does not absorb water, pressure gauge and vacuum gauge pointer violently beating the reason is insufficient filling water. Pipelines and connections leak. Check the bottom valve hand leaks, then irrigation foot water, tighten the leak. Boiler feed pump power consumption is too large The main reason is the packing pressed too tight, and fever, impeller wear, boiler feed pump flow increases. The solution to adjust the packing gland, check the pump shaft is bent, replace the impeller, increase water resistance, lower flow. Caused by the boiler feed pump overheating due to friction caused by bearing damage, or due to lack of lubrication system, poor oil quality caused. Therefore found to the boiler feed pump after overheating should first check whether the lubrication system is lack of oil or oil contains impurities, followed by the investigation bearing is damaged. For overheated boiler feed pump body that has just been overhauled, check that the clearance of the rolling bearing or bracket cover is too small. After the above inspection, the boiler feed pump body still appears to be fever Check the pump shaft is bent or two axes are not the same, check the impeller balance, adjust the pump shaft or adjust the two-axis concentricity, clear the impeller balance hole, in order to ensure that the boiler feed pump Pump shaft and impeller rotation balance, troubleshooting. Boiler feed pump abnormal sound, the boiler feed water pump is not the main suction pipe resistance is too large, there is air infiltration at the water absorption, said the liquid temperature is too high. Overhaul the suction pipe, check the end of the valve, reduce the height of water absorption, blockage of gas leakage, reduce the temperature. Bearing overheating, the reasons for the pump vibration motor and pump do not heart, bearing lack of oil or wear. High-speed motor and pump center, refuel or replace the bearings. Set up to the boiler feed pump parts failure and replacement records, a detailed grasp of the various components of the damage time in order to facilitate the replacement of components in time before the end of life to avoid damage to parts and found not timely damage to the unit. In addition, but also to strengthen the pump lubrication system maintenance, regular inspection of the amount of lubricant, lubrication of parts in a timely manner to avoid "dry grinding" and so on. Lubricant before adding to pay attention to check the oil and add cleanliness of the mouth, to avoid adding impurities into the bearing damage. In the conservation should pay attention to the feed pump system piping inspection and maintenance, timely leakage of plugging, rust-proof coating on the outside of the pipeline should always be checked, the coating spalling timely spraying, in order to ensure that the tube Road corrosion resistance. Maintenance also need to pay attention to the pump water treatment system inspection and maintenance. (Editor: Ye Qianwen) An expanded reading: 2016 China World Expo 2016 Beijing Oil Show pump valve pipe fittings exhibition information 2016 exhibition information
Surface Grinding is used to produce a smooth finish on flat surfaces. It is a widely used abrasive machining process in which a spinning wheel covered in rough particles (grinding wheel) cuts chips of metallic or nonmetallic substance from a workpiece, making a face of it flat or smooth.
Surface grinding is the most common of the grinding operations. It is a finishing process that uses a rotating abrasive wheel to smooth the flat surface of metallic or nonmetallic materials to give them a more refined look by removing the oxide layer and impurities on work piece surfaces. This will also attain a desired surface for a functional purpose.
The surface grinder is composed of an abrasive wheel, a workholding device known as a chuck, and a reciprocating or rotary table. The chuck holds the material in place while it is being worked on. It can do this one of two ways: ferromagnetic pieces are held in place by a magnetic chuck, while non-ferromagnetic and nonmetallic pieces are held in place by vacuum or mechanical means. A machine vise (made from ferromagnetic steel or cast iron) placed on the magnetic chuck can be used to hold non-ferromagnetic workpieces if only a magnetic chuck is available.
Factors to consider in surface grinding are the material of the grinding wheel and the material of the piece being worked on.
Typical workpiece materials include cast iron and mild steel. These two materials don't tend to clog the grinding wheel while being processed. Other materials are aluminum, stainless steel, brass and some plastics. When grinding at high temperatures, the material tends to become weakened and is more inclined to corrode. This can also result in a loss of magnetism in materials where this is applicable.
Surface Grinding
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