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Split sliding bearing device
Source: China Bearing Network Time: 2013-11-12
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1 Smooth principle The smooth formation of this bearing has roughly three processes; the shaft is at its lowest position due to its own component when the shaft is stopped; the smooth oil is extruded by the journal; the wedge-shaped oil gap is formed between the bearing and the side of the journal; When rotating; because the viscosity of the oil adheres to the metal surface; the oil layer rotates with the shaft; when the oil layer passes through the wedge-shaped oil gap; because the molecules are kneaded and their own kinetic energy; the pressure on the shaft will rise axially; when it reaches a certain At the time of speed; the oil pressure on the shaft increases; the shaft and the bearing surface are completely separated by the oil film; then the liquid dynamic pressure is smooth. The conditions for the liquid dynamic smoothness are:
1 The journal and the bearing should have a certain clearance after cooperation; usually equal to 1/1000~3/1000 of the neck diameter,
2 It is necessary for the journal to have a certain line speed; to establish a satisfactory oil wedge pressure,
3 It is necessary to continuously fill the oil with a certain viscosity between the two working surfaces.
2 split sliding bearing device
(1) Housing assembly. When the bearing bush, bearing housing and bearing cover device are installed, the bearing back and the bearing housing hole should be touched well; if the bearing is not in compliance, the thick-wall bearing bush should be scraped based on the bearing housing hole; â–³h higher than the split surface of the bearing housing; usually â–³ h = 0. O5~ 0. Im m .
(2) The contact area between the bearing outer surface and the bearing seat; the upper tile shall not be less than 40; the lower tile shall not be less than 50; and the required touch area shall be uniform; the bottom of the lower tile and the two sides shall not be allowed to have a gap; once there are gaps on both sides of the lower tile; The pressure is increased; it will cause rapid wear and tear. The touch mottle between the bearing bush and the bearing seat should be 1~2 points/cm; too little will cause the bearing bush to aggravate the wear and deformation.
(3) Bearing and journal device. When mounting the bearing; it is necessary to pay attention to the contact angle and touch point between the bearing bush and the journal. The center angle corresponding to the touch surface between the bearing bush and the journal is called the touch angle; the angle is too large. Smooth oil film composition; damage smoothing; make the bearing shell wear quickly, too small will add bearing pressure; will also make the bearing tile wear and tear. Usually touch angle 0 60 ~ 90.. The touch point between the bearing bush and the journal is related to machine characteristics Medium load and continuous operation; 2~3 points/cm; heavy load and high-speed operation machine 3~4 points/cm; to make the touch angle and touch mottle meet the needs; it is necessary to carry out scraping. First scrape the lower tile; Apply a thin layer of red lead oil on the journal; place the shaft on the bearing bush; rotate it in the horizontal and vertical directions and take it off once; if it is found that the imprint is uneven, it should be scraped; Unevenness; should be scraped; repeated times; until the imprint on the bearing pad spread evenly; fit the demand to stop.
(4) Adjustment of bearing clearance. The radial sliding bearing has a top clearance and a side clearance. The top clearance can adhere to the liquid conflict; its numerical value is related to the shaft diameter, the number of revolutions, and the viscosity of the oil. Usually controlled at I/lO00d~3 Between /lOOOd (d is the diameter of the shaft). The role of the backlash is to accumulate and cool the smooth oil; constitute the oil wedge; its value is changed; the more the gap to the bottom of the shaft, the more the history For Jiayu sacs, the top gap is measured by the lead-press method; when measuring, first remove the upper part of the bearing; and select a soft lead wire with a diameter of 1.5 to 2 times the top gap and a length of 10n 40mm; On the bearing neck and on the bearing joint surface; then put the bearing cap; evenly tighten the nut; then use the feeler gauge to check the backlash; the plug feeler should not be less than 1/4 of the journal. The gap of the bearing joint should be It is even and flat; then open the bearing cap; take out the flattened wire and measure the thickness of the wire with a ruler.
If the measured head clearance is greater than the specified value; then the thin surface of the joint surface should be cut; or the joint surface should be scraped, such as the top clearance. The feeler gauge is small when the gap is measured; it is scraped when the touch angle is guaranteed.
3 2700×3600 ball mill hollow bearing device ball mill hollow shaft bearing is split type; single-sided oil wedge sliding bearing; front and rear two bearing bushes each bearing about F=50t; bearing width B=450mm; journal diameter d-100mm; bearing village is Zc nSnSb/1-6 Babbitt alloy; its partial pressure ratio is 15-20kg/cm; P=18kg/cm; the touch angle is 0 80. It is necessary to repeat the scraping of the front and rear bearing under the satisfactory device. When the touch point reaches 3-4 points / cm and spread evenly; then scrape 45., 25mm × 25ram net; the knife flower width is about 5mm; finally re-grind the car 2 to 3 turns; investigate the front and rear bearing lower tile; 4 to 5 bright spots in the netting; and evenly distributed; use the diameter 2ram lead wire to measure the headspace according to the above method; the front tile top clearance is 1.15mm; the rear tile headspace is 1.22mm; The backlash; and then the final measurement of the front tile is 0.58 ram; the back tile backlash is 0.65 mm; both meet the skill needs. From February 1996 to the present; normal operation; no abnormal situation.
4 Conclusion The analysis of the sliding bearing application process is divided into three periods; the first stage is the running and plastic deformation period, the second stage is the normal operation period, the working time is related to the quality of the grinding tile and the quality of the device, and the oil film is damaged during the second stage burning; The temperature rise is sharply worn; it is also the most dangerous period. Therefore, it is necessary to pay attention to the quality of the scraper and the quality of the device when installing the sliding bearing; make the backlash backlash within the range of skill requirements; extend the application period; usually should pay attention to the investigation; Protection; to ensure the normal operation of the equipment.
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