Mill bearing oil spill transformation-Wenzhou Bearing wholesale

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Mill bearing oil spill transformation

点击数：4476 日期：2014/4/4

Due to the need of the new 1, No. 2 coke oven project, I plant coal preparation plant for the new 2 PFCK-1825 hammer crusher, crushing capacity design is 500 ~ 550t/h, mainly for the new 1, 2, 1 coke oven and the old 1 ~ 4 coke oven coking coal pulverization. 1, equipment status and problems The main functions of the type PFCK-1825 hammer crusher of fuel injection system: one is to offer the hydraulic oil, work with the transmitted torque for hydraulic coupler; two is to provide the lubricating oil for the bearing crusher rotor, bearing lubrication. Mill raw seal both ends of the rotor bearing for dry oil seal, it relies on the rotor running in the sealing ring and the relative motion between the end cover, will join the dry oil mix into the appearance of oil membrane, and thus play a role in sealing. This sealing method for vibration smaller working environment is better. Due to the mill working environment is heavy load, low speed, and the impact load is more frequent, vibration crusher rotor generally maintained at 180 ~ 250 μ m of displacement, the resulting crusher rotor bearing seat in the process of operation, failure stem oil seal, oil bearings two end everywhere leakage 2, analysis of leakage (1) the hydraulic system pressure is too high. Mill supply system of the normal operating pressure is 0.15 ~ 0.20MPa, beyond the high limit, non standard seal bearing the two end of the sealing ring will withstand the pressure of overload, resulting in bearing seat face oil. (2) the flow of the hydraulic system is too large. Standard flow supply system of the original design of 30L/min, but the mill capacity increase, the flow is not suitable for checking, but from the actual operating conditions, flow and the operation condition does not adapt. (3) bearing seat structure is not reasonable, only unilateral oil return hole, and the end cover is not oil baffle plate, lubricating oil poor oil return, stranded in the bearing unilateral, resulting in too much oil and leakage. (4) the quality of the sealing ring is poor, not high temperature. (5) the installation shaft sealing ring burr parts, when the rotor shaft during normal operation, Mao Cihuai bad sealing ring sealing ring, causing premature failure. 3, improvement measures Pressure and flow regulating system 3.1 According to the actual detection of the above analysis and field, we use the calibration of flow and pressure of re approved. (1) to determine the system pressure. Because the standard pressure range of fuel supply system in 0.15 ~ 0.20MPa, and the lubrication of mill bearing does not need so much pressure. Through field calibration, bearing lubrication pressure only 0.12 ~ 0.18MPa, which approved the bearing seat of hydraulic system pressure is 0.15MPa, and set up the relief valve in the system. (2) to determine the system flow. Standard flow pulverizer oil supply system for 30L/min, a bearing seat bearing lubrication field calibration of the flow rate of 18 ~ 25L/min. Flow hydraulic system thus approved lubrication of bearing for 20L/min, and is additionally provided with a regulating valve in the system. (3) check balance. When the pressure is 0.15MPa, the oil supply system flow not to 20L/min. In this regard, for school again in the actual process, allowing the system pressure and flow can be adjusted in a short region, in order to achieve the lubrication, the bearing seat bearing cleaning purposes. After checking the optimum conditions, the rotor bearing seat bearing lubrication: pressure is 0.15 ~ 0.20MPa, flow rate of 18.5 ~ 21.5L/min. Improvement of the 3.2 bearing seat (1) in the bearing seat, in the next part, add lubricating oil channel matching and bearing oil groove, to ensure that the lubricating oil into all bearing, lubrication, cleaning, the heat transfer effect. (2) in the lower bearing seat added about 2 return oil hole, satisfy the lubrication oil flow road. (3) on the left and the right end cover increased oil baffle, baffle between the oil plate and rotating shaft to maintain 0.50 ~ 1.0mm gap, play the dual function of sealing and oil baffle. (4) on the left and the right end cover and the axis of rotation between the labyrinth seal, the end cap new sealing ring special and adjusting the gland, the sealing ring and adjusting the gland according to the hydraulic system pressure, flow transformation. 3.3 implementation process According to the drawings on, a lower bearing seat, left and right end cover, an oil retaining ring and other spare parts was improved, while new regulation of gland and seals and other parts. The original device comprises a bearing is removed, then the right adjustment cover, sealing ring and the end cover is installed, then the heating of the bearing is mounted on the rotor shaft, and a locking cap after preparation for air cooling. Air cooled to a lower bearing seat lifting in place, the rotor shaft with care in the lower bearing seat, then install the upper bearing seat. By connecting screw bolt, a lower bearing seat as a whole, the installation on the left side of the end cover, sealing ring and adjusting. No leakage half section bearing seat device thin oil lubrication with multi-layer sealing method, integral bearing seat can also use this structure, the sealing effect than the mechanical seal and seal better. 4, reform effect (1) ensure the safe operation of crusher, whether in low speed or high speed condition, bearing in the bearing seat without bearing heating, damage fault caused by bad lubrication. (2) from a technical adjustment of the sealing mode, effectively solves the leakage problem of the bearing surface. (3) to optimize the mill supply system configuration, system pressure, flow more accord with the actual production. (4) improved consumption of hydraulic oil 1500kg/a, improvement consumes only 150kg/a, saving the sealing element 20 sets of /a.

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