1. Increase the pressure of the gas seal and adjust the compression spring. The Fuller pump is in use, and the tongue valve needs to be continuously switched. When the tongue valve is opened, that is, when discharging, there is inevitably a part of the low-pressure compressed air that transports the material into the discharge chamber. Since the spiral portion of the cylindrical portion is long and the resistance is large, this portion of the compressed air is not easily caught at the dropping funnel. The only way out is to discharge the bearing in the direction of the bearing through several aprons on the front of the discharge end bearing. When the gas seal pressure is low, the airflow cannot be resisted, and the portable raw material powder enters the bearing, causing the bearing to heat up.
In order to solve this problem, it is necessary to increase the pressure of the gas seal, at least to be greater than the pressure of the compressed air conveying the material. In addition, the tightness of the compression springs of several sealing rubber rings must be adjusted to a moderate degree. Too tight to increase wear, the bearing is still prone to heat; too loose, the apron will not play a sealing role, easy to make raw meal into the bearing.
2. The axial clearance of the movable bearing must ensure that the screw shaft of the Fuller pump is generally long. Take the diameter of the 300 Fuller pump as an example. The total length of the screw shaft of the pump is 3155 mm. The distance between the fulcrums at both ends is considered to be 2800 mm. The temperature difference of the casing is calculated at 30 ° C, 40 ° C and 50 ° C, and the thermal elongation of the screw shaft is 0.950, 1.266, 1.582 mm, respectively. For such a large amount of elongation, one of the bearings at both ends must be a movable bearing. According to the design principle, the movable bearing is generally installed at the discharge end, and the axial clearance must be ensured, otherwise the bearing will inevitably heat up. Therefore, a minimum clearance of about 2 mm should be left between the outer end cover of the bearing end of the discharge end and the bearing.
3. The amount of oil in the bearing should be improperly applied to the bearing, which will also cause the bearing to heat up.
When lubricating greases for general rolling bearings, add 1/2 to 2/3 of the bearing space volume of grease. If there is too much grease, the bearing will heat up. If it is too little, the operation cycle will be shortened, the refueling cycle will be frequent, and the second will be caused by insufficient oil.
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