In terms of bearings alone, there is nothing wrong with these regulations, because when the surface temperature of the bearing reaches 75 °C, the contact of the rolling elements is far more than 75 °C, while the tempering temperature of ordinary bearings is 150 °C, and its hardness is in HRC62. Between 64, as long as the temperature does not exceed 120 °C, the hardness of the bearing components will not decrease. When the temperature exceeds 120 °C, the metallographic structure and hardness will change. When the temperature exceeds 0 °C, the hardness will be proportional to a certain temperature rise gradient. Sexual decline. In order to avoid the bearing from accelerating damage due to excessive temperature, it is necessary to draw the working temperature limit of the bearing to attract people's attention. However, if the upper temperature limit is not included in this temperature range, it can be regarded as "normal" or " Allow "this meaning. For equipment such as fans that have only a single heat source under normal operating conditions, as long as the installation is correct, lubrication and maintenance are good, the general bearing temperature will not exceed 50 ° C; that is, the temperature rise does not exceed the ° ° C, if the temperature rise exceeds 20 ° C It should be noted that it should be treated as an abnormal symptom. Strengthening inspection and maintenance to ensure the normal operation of Fule-type fans Strengthening maintenance management is the key to ensuring the safe operation of Fule-type fans and extending the service life of bearings and triangle tapes. First, strengthen inspections, find out abnormal situations and report in time, find out the reasons for timely treatment, and eliminate the faults in the bud; second, rational use of oil to maintain a good lubrication state; third, carefully observe the post work, familiar with the normal working state of the fan, Find out the cause of the failure, and prescribe the right medicine, and strive to solve the problem fundamentally. High-speed fans mostly use self-aligning ball bearings. The cages of small bearings are generally stamped and formed. The size of the isolation guide ring has a great influence on the rotation accuracy of the bearing. The balance of the cage itself is also important. Therefore, it should be selected and maintained. The frame has a smaller gap and a more regular bearing. In addition to differences in roughness, clearance and geometrical accuracy of domestic and imported bearings, the most prominent difference in appearance is that the cage (referring to small self-aligning ball bearings) is too loose, and the radial displacement of the inner and outer rings of the balls and bearings Both are too large and the rotation accuracy is lowered, which is one of the main reasons for the wear and tear of the cage. In the course of more than ten years of production practice, the company has carried out many transformations on the pulverized coal supply system, and has successively adopted the removal of the screw conveyor under the warehouse, the automatic blowing with the solenoid valve, the transformation of the internal angle of the warehouse, the installation of the gas storage tank and the valve body. Plated blessings and other measures, but with little effect, still have the following main problems: (l) The pulverized coal warehouse design is unreasonable. First, the coal powder silo is a concrete silo, which cannot be insulated. As a result, the inner wall of the silo often dews, causing the inner wall to stick to the coal powder, forming a crust, and long-term retention will cause spontaneous combustion and coking, which is easy to cause There was a fire in the warehouse. Second, the volume of pulverized coal bins is too large, and there are many dead corners and stagnant areas. The utilization rate is extremely low, only 30% to 40%, and it is difficult to clean up. This is also the main reason for coal spontaneous combustion and coking affecting coal feeding. (2) The design of the position of the two people in the coal powder warehouse is unreasonable as shown in Figure la. The coarser coal powder collected by the cyclone dust collector enters the center population B, and the fine coal powder collected by the bag dust collector enters the person. The population A of the warehouse side, the coarse and fine coal powder is unevenly mixed, resulting in the coal powder used in the kiln head being too fine, and the coal powder used in the decomposition furnace is too thick. When the fine coal powder is burned in the kiln head, the flame is short and the combustion is rapid, causing local high temperature of the cylinder and burning the kiln skin. The crude pulverized coal entering the decomposing furnace is incompletely burned, producing a large amount of CO, causing C; the CO content of the outlet exceeds the standard, causing a tripping of the electric precipitator. (3) Low precision of pulverized coal metering equipment The measuring device used for measuring the amount of coal fed to the kiln head and the decomposition furnace is two belt scales at the bottom of the warehouse. Due to the uneven and volatile fluctuation of the coal powder bin, combined with the long-term use, the metering accuracy of the device is low, which greatly affects the accuracy and stability of the coal supply in the kiln system. (4) The failure rate of the lock air supply valve is high. The four lock air valves used in the pulverized coal supply system are the key equipment to ensure the normal operation of the system. Due to the coking and agglomeration in the warehouse, when the material is unloaded, the agglomerates often jam the rotary lock valve and are forced to stop the kiln for repair and replacement.
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