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Grinding and installation of thrust bearing of cone crusher

by:JNSN     2021-12-28
1. The function and structure of the thrust bearing The function of the thrust bearing of the cone crusher is to support the hollow eccentric shaft and reduce the running resistance of the hollow eccentric shaft. At the same time, the accuracy of its installation directly affects the meshing gap of the bevel gear, ensuring a reasonable clearance between the hollow eccentric shaft sleeve and the main shaft, and avoiding the phenomenon of 'runaway'. 2. Grinding and scraping of the thrust bearing During the operation of the crusher, the upper circular plate 2 of the thrust bearing and the hollow eccentric shaft 1 are connected with pins and rotate accordingly; the lower three-claw circular plate 5 passes through the surrounding three claws It is inlaid with the bottom cover 7; and the middle circular plate 3 and the middle circular plate 4 slide relatively. Then there are a total of 3 sets of contact surfaces, that is, between the parts 2 and 3, between the parts 3 and 4, and between the parts 4 and 5, which need to be rubbed to ensure a good running state. The purpose of grinding is to make the plane bearing evenly compressed and create conditions for good liquid lubrication. The whole process can be divided into two parts: rough scraping and fine scraping. The flatness of the two contact surfaces can be checked first during the grinding, and red lead powder can be applied evenly and thinly to detect. The two contact surfaces can be rotated in a clockwise direction first, and the second time can be rotated in a counterclockwise direction. Cross research. Then start rough scraping. When scraping, you can use a special 25mm flat blade or a slightly larger caliber. During rough scraping, all the contact surfaces after grinding are scraped off, the ones that are not in contact cannot be scraped, the movement distance of the knife trace should not be greater than 25mm, and the scraped knife trace should be hook-shaped. So repeatedly scraping after the research. Part of the contact points can be reserved for each scraping. When the two mutual contact points are basically evenly distributed, the oil storage point can be scraped with a monthly spatula. At this time, it should be noted that the larger the diameter, the contact point is required from the center of the circular plate. The distribution points should be as good as possible. Repeatedly grind and scrape, so that the contact points between the two contact surfaces are required to be no less than 3 points per 25mmX25mm. The grinding of the three contact surfaces can be done in the same way as above. Taking into account the different materials of the discs, the harder discs can be selected for grinding and scraping first, and use this as the reference surface. Uneven contact points on the contact surface or too many or too few contact points will affect the flat running state of the plane bearing. In the field troubleshooting, it has been found many times that the movement speed of the three-jaw circular plate is not zero. The circular three-jaws on the three-jaw circular plate are forced to be damaged, which aggravates the circular wear of the circular plate (friction plate). It becomes an irregular ellipse, which causes the crusher to malfunction or cause the phenomenon of 'speeding'. 3. The installation of the thrust bearing to ensure the installation accuracy of the thrust bearing on the cone crusher is a necessary condition for the normal operation of the crusher. The installation can follow the following steps: (1) The installation of the thrust uranium bearing should be consistent with the order of the contact surfaces during grinding. (2) First, the three-claw circular plate should be stable when placed in the bottom cover. If there are casting burrs and remaining molding sand in the bottom cover, clean up, and then pour lubricating oil until it is exactly flush with the three-claw circular plate. To test whether it is stable. For testing, use a spreader to lightly strike around the three-jaw disc. If the oil splashes from the circumference of the disc, it proves that there is still a gap between the three-jaw disc and the bottom cover, and it should be cleaned and repaired again. (3) After that, the middle round plate and the round plate are installed in sequence, and the above-mentioned method can still be used for the detection method. (4) Finally, install the hollow eccentric shaft, spherical tile holder and main shaft. When the hollow eccentric shaft is hoisted, the counterweight of the big gear should be placed above the small bevel gear so that the outer ends of the bevel gear are aligned. After the spherical bush is installed, the spherical bearing seat and the machine seat should be fitted as far as possible. It should be tight and not loose. During this period, three data were successively measured: the gap between the conical bevel teeth a; the gap between the main shaft and the cone sleeve b; the gap between the end surface of the hollow eccentric shaft and the bottom of the spherical tile holder c. (5) Integrate the above three data into a unified consideration to install the gap piece of the taper bearing, that is, determine the position of the three-jaw disc and the bottom cover of the machine. The gap piece is made of ordinary plates, but it is possible to avoid the use of steel plate thickness superimposition to complete. If the gap is greater than 3.5mm, consider reducing the thickness of the gasket at the connection between the bottom cover and the frame or directly reduce the total height of the bottom cover itself, according to field experience.
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