The underground conditions are harsh, and it is relatively difficult to replace the floating oil seal on site, so the cause of oil leakage should be analyzed in advance before replacement, the tools should be prepared, and the personnel and time should be reasonably arranged for on-site operation to minimize unnecessary repetitive work. Reasonable arrangement will greatly shorten the operation time and improve work efficiency.
1. Preliminary preparation
1. Analysis of the causes of oil leakage.
Before replacing the floating oil seal, it is necessary to preliminarily judge the cause of oil leakage according to the on-site situation
If the floating oil seal runs continuously for more than 90 days, and the oil leakage increases from less to more, the gap of the floating oil seal is too large, and the gasket needs to be prepared in advance, and the floating oil seal position should be adjusted to the appropriate compression amount according to the need
If the floating oil seal begins to leak oil at the beginning of use, and the oil leakage is large, accompanied by high temperature, the gap of the floating oil seal is too small, and the gasket needs to be prepared in advance to adjust the position of the inner ring of the bearing to the appropriate compression
Contact the floating seal manufacturer to get the compression amount of the floating seal.
2. Prepare tools.
According to the analysis of the cause of oil leakage, prepare gaskets of corresponding sizes, with a thickness of 02~0.4 mm is appropriate, and can be freely combined during installation;
Prepare to disassemble the jack bolt for the drum and the flange, with a strength of 12Level 9 is appropriate;
Prepare socket wrenches and afterburner rods for matching jacking wires;
Prepare waste bearing balls (or rollers), which require a smaller diameter than the method bluetop wire hole, which can be easily inserted;
Prepare a depth and shallow ruler, and if there is no depth and shallow ruler, you can use 2 vernier calipers (measuring range of more than 200 mm) instead;
Prepare monocoque hydraulic struts and square fallen logs.
2. Disassembly
1. Disassemble the drum.
Drive the shearer to the head or tail position with the knife feeding mode, ensure that the rocker arm that needs to replace the floating oil seal is close to the side of the roadway, and leave enough room for the scraper conveyor to retreat
Open the end face cover plate of the drum, take out the flange bolt of the drum connection, and eject the drum with the ejector screw, where the match is a gap fit, and the mating surface is short, and it is relatively easy to eject;
Operate the shearer, drop the rocker arm, the drum is in contact with the ground, and at the same time, the backward scraper conveyor separates the rocker arm from the drum, and the traction shearer moves the rocker planetary head to the open area.
2) Dismantle the method (with centering seat).
Put 4 8 high-strength jacking wires evenly into the method blue top wire hole, and put waste bearing balls (or rollers) at the bottom to transition support to increase the jacking wire pressure and reduce the working intensity. During operation, it should be noted that the ejector wire in each position should be evenly stressed. This process takes a relatively long time, and the method starts to exit relatively slowly, and then gets faster and faster;
Under normal circumstances, flange and centering seat can be dismantled together, and can be disassembled separately when encountering particularly tight, difficult to disassemble situation, and the disassembly step is consistent with described.
3. Measurements
At present, there are two main types of floating oil seals for planetary reducers in the cutting part of shearers. There is a difference in the way they are measured.
1. As shown in Figure 2, the floating oil seal measures size a and b, and the depth and shallow ruler (vernier caliper) are evenly measured at 4 points on the circumference, and the average value is measured to obtain the gap c=a-b, which is compared with the compression required by the floating oil seal.
2. As shown in Figure 3, the floating oil seal measures the dimensions a, b and c, and measures 4 points evenly on the circumference with a shallow ruler (vernier caliper), and the average value is measured to obtain the gap a-b-c, and the gap with the floating seal is required to be 3 mm 05 mm comparison.
3. According to the measurement results, decide whether to install a gasket to adjust the gap.
If the measured clearance is within the required clearance range of the floating oil seal, there is no need to install an adjustment gasket and install it directly
If the measured clearance is larger than the required clearance of the floating oil seal, it is necessary to install an adjustment gasket at the position of the floating oil seal, which can be freely combined according to the thickness of the gasket
If the measured clearance is smaller than that required by the floating seal, an adjustment gasket needs to be installed at the position of the inner ring of the bearing, which can be freely combined according to the thickness of the gasket.
4. Installation
1) First of all, check the floating sealing ring, do not allow any impurities to enter the floating sealing ring, if impurities are found, be sure to clean;
2) Clean the surface of the sealing seat, the two-stage planetary reducer and the connecting flange to ensure that the oil seal installation position is free of oil stains, stains, iron filings, etc.;
3) Encapsulate the floating oil into the sealing seat and the connecting flange, wear clean gloves during installation, press the oil seal into it, ensure that the oil seal is installed in place, and do not knock on the surface of the floating seal ring
4) After the oil seal is installed in place, evenly apply a layer of clean oil film on the surface of the floating seal ring to prevent dry grinding between the sealing surfaces in the early stage of the floating oil seal operation, and pay attention to avoid the sealing ring being stained with oil when applying the oil film
5) The flange is installed on the planetary reducer seal seat, and then pressed, and the hydraulic monomer strut can be used in the pressing process
6) After the method is installed, try to rotate for 15 20 min, confirm that there is no oil leakage, and then install the drum.
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