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Large jaw crusher main bearing replacement repairing process

Source: China Bearing Network Time: 2014-08-01
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Most of the main bearings of large jaw crushers use split plain bearings; the bearing liners are mostly made of babbitt alloy; the demand for scraping skills of such bearings is high; the scraping is not good or the gap adjustment is improper; Researching tiles or burning watts. We have summarized an excellent set of methods for changing the shaving and gap adjustment; the analysis is as follows; for us to refer to.
1 The work to be done when removing the old tile. 1) Measure the thickness of the gasket of the old bearing pad joint.
.2) Measure the level of the spindle.
.3) Carefully check whether the spindle can be smooth; whether there are any defects such as rust and bruise; if any, try to eliminate it.
.4) Measure the headspace, backlash and axial clearance of the old bearing bush.
2 Detecting the touch condition of the tile back and the bearing seat according to the requirements of “JB/T5000. 10-1998 Heavy Machinery General Skills Condition Device”; it is necessary to scrape the tile back; make it meet the skill requirements of the rule. Otherwise; equipment operation When the bearing bush and the bearing seat are simply reversed slip or transition. In order to avoid this appearance, the pin and sleeve positioning methods are usually selected; as described herein, the main bearing with the positioning pin is provided.
3 The skill requirements of the bearing scraping are based on the requirements in JB/T5000. 10-1998 Heavy Machinery General Skills Equipment; the spindle scraping should reach the following skill specifications.
.1) The main shaft and the bearing bush should be evenly and finely touched; there must be a certain cooperation gap; the upper and lower bearing pads and the spindle touch angle are some of the oil wedges; and the wedge shape is gradually transitioned from the maximum to the zero.
.2) The touch angle is not too big or too small. The touch angle is too. The 嵬哐 嵬哐 吭黾 吭黾 谎 谎 谎 厥 厥 谎 谎 谎 谎 谎 谎 谎 厥 谎 谎 谎 谎 谎 倜 倜 倜 倜 倜 倜 倜 倜 倜 倜The touch angle is too large; it will affect the composition of the oil film; the damage will be smooth. Therefore; under the premise of not affecting the bearing condition of the bearing bush; the smaller the touch angle, the better.
.3) The more the theoretical touch mottled within the touch angle range; the finer and more uniform the better.
4 Scraping the spindle bushing The bearing bushing should be based on the shaft; the two are scraped with the inner hole scraper after grinding. The scraping process is to scrape the tile first; then scrape the tile first; then scrape the entire tile; Scratch side clearance and oil storage point. The shaving of the bearing bush can usually be divided into three processes: rough scraping, fine scraping and fine scraping. When scraping, it should be selected to be light, heavy, scraped, and scraped. When scraping the bearing bush; not only make the touch point and touch angle meet the skill requirements; and the top side clearance needs to reach the regular value.
.1) The upper and lower tiles are coarse and fine-scraped. The two lower tiles are mainly installed in the bearing housing; then a layer of developing agent (such as red powder, red Qiang oil, etc.) is applied to the main shaft; Inside the bearing; and turn two or three turns in the forward and reverse directions; then take out the spindle; perform rough scraping according to the scattering condition of the colored points on the bearing. During the rough scraping, you can use the positive rake angle. The first few times can be heavier; Scratch some metal; in order to speed up the progress of the scraping. When the touch area reaches 50%, it should be finely scraped. During the fine scraping, a small rake angle scraping can be used, and the cutting edge should be at an angle of 45° to the center line of the bearing bush; Do not use excessive force; avoid the ripples of the knife. The scraped blade should be inserted around; until the touch mottle in the touch angle range is evenly covered; the spindle horizontal error is stopped between 0. 2mm/m. The method and demand are basically the same as the requirements of the rough and fine scraping method of the lower tile. The difference is that the upper tile is placed above the main shaft for research.
.2) The upper and lower tiles are finely scraped and the lower tiles are passed through the coarse and fine scraping; the touch mottle is still large; further research is required. First, the tile joints are added to the upper and lower tile joints; Install the spindle, upper tile, positioning pin, and tighten the screw; make the spindle change a few times in the normal working direction; then remove the upper tile and hang the spindle; perform the lapping operation. When scraping, it is best to scrape with negative rake angle Until the touch surface on the touch surface meets the skill needs to stop. 3) After the scraping side gap and the oil storage point are finished, the side gap and the oil storage point should be scraped. When scraping the side gap; the two ends should be left a little; avoid The oil flows out from both sides of the tile; then ensure that the bearing is smooth. There is some and no touch between the tiles; it should be gradually transitioned; no significant boundaries are allowed. Then the oil is scraped on the curved arc of the bearing. Point; oil storage point is used to store smooth oil. The oil storage point can be round or flat; the depth is usually 0. 3 ~ 0. 5mm, the area is 15 ~ 30mm2, the total area should not exceed the touch arc surface scraping Oil storage point; the oil storage point is used to store smooth oil. The oil storage point can be round or flat; The depth is usually 0. 3 ~ 0. 5mm; the area is 15 ~ 30mm2, the total area should not exceed 1/5 of the touch curved surface.
5 Measurement and adjustment of bearing clearances The clearance of bearing bushes determines the thickness of the oil wedges; and affects the accuracy of the spindle. The excessive clearance of the bearing bushes causes the equipment to oscillate; the life of the equipment is reduced, and the gap between the bearing bushes is too small and will cause burnt tiles. Therefore; Dispatching the bearing clearance is an important issue; it is necessary to make it reach the specification of the rules.
.1) The adjustment of the top clearance C and the height of the top clearance of the measurement method can be adjusted by increasing or decreasing the thickness of the gasket at the joint surface of the bearing. The smaller the number of gaskets; the better the bearing compaction condition; the smoother the equipment works. Therefore, in the case of ensuring that the tile is not present; the less the better the gasket. The measurement method of the top void is usually measured by the pressure lead method.
.2) Adjustment of the side clearance and measurement of the side clearance between the bearing bush and the journal; usually the feeler is used to measure. When measuring, the length of the stopper into the gap should not be less than 1/4 of the shaft diameter. The side clearance of the bearing surface of the bearing bush should be even and flat.
.3) Measurement of axial clearance The axial clearance of the bearing bush; usually measured with a feeler gauge.
Through many years of theory; we think that the top clearance of the bearing bush should be 0. 15% ~ 0.2% of the shaft diameter; the backlash should be 60% ~ 100% of the top gap; axial gap should be 1 ~ 3mm is the best.
6 When assembling and commissioning; firstly, clean the bearing bush, journal, oil collector and smooth oil pipeline. Then assemble the bearing shell and connecting rod and the like. When the device is equipped with a V-belt, it should be slightly smaller than normal operation. Loose. When testing the car; first start the oil pump; and make the oil supply slightly larger than normal operation. If there is no obvious increase in oil temperature and significant increase in current during the test run; Can be put into normal use.
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