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Grinding, scraping and installation of thrust bearing of cone crusher

by:JNSN     2022-03-15
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 clearance of the bevel gear, ensuring a reasonable matching clearance between the hollow eccentric shaft sleeve and the main shaft, and avoiding the 'flying car' phenomenon. 2. Grinding and scraping of the thrust bearing During the operation of the crusher, the upper circular plate 2 of the thrust bearing is connected with the hollow eccentric shaft 1 by a pin and rotates accordingly; the lower three-claw circular plate 5 passes through the peripheral three claws Inlaid with the bottom cover 7; while the middle circular plate 3 and the middle circular plate 4 slide relative to each other. Then there are 3 sets of contact surfaces, namely, between parts 2 and 3, between parts 3 and 4, and between parts 4 and 5, to ensure their good running state by grinding and scraping. The purpose of grinding and scraping is to make the plane bearing press evenly and create conditions for good liquid lubrication. The whole process can be divided into two parts: rough scraping and fine scraping. When grinding and scraping, you can first check the flatness of the two contact surfaces. You can use red dan powder to apply evenly and thinly to detect. Let the two contact surfaces rotate clockwise first, and then rotate counterclockwise for the second time. Cross-study. Then start rough scraping. When scraping, you can use a 25mm flat-mouth special blade or a slightly larger diameter. When rough scraping, all the contact surfaces after grinding will be scraped off, and those that are not in contact cannot be scraped. The moving distance of the knife trace should not be greater than 25mm, and the scraped knife trace should be in the shape of a hook. This is repeated after grinding and scraping. Some contact points can be reserved for each scraping. When the two mutual contact points are basically evenly distributed, the oil point can be scraped with the shovel blade. The distribution points should be better. Repeatedly grind and finely scrape, so that the contact points between the two contact surfaces are required to be no less than 3 points per 25mmX25mm. The grinding and scraping of the three contact surfaces can be performed in the same way as above. Considering the different materials of each circular plate, a hard circular plate can be used to grind and scrape 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. During the on-site troubleshooting, it was found many times that the movement speed of the three-claw circular plate was not zero, and the three claws on the circumference of the three-claw circular plate were forcibly damaged, which aggravated the wear of the circular plate (friction plate) according to the circumference. It becomes an irregular oval, which makes the crusher malfunction or causes a 'flying car' phenomenon. 3. The installation of the thrust bearing ensures 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 small thrust bearing should be consistent with the order of the contact surfaces during grinding and scraping. (2) The three-claw disc should be placed smoothly in the bottom cover. If there are casting burrs and remaining molding sand in the bottom cover, clean it up, and then pour lubricating oil to the position just flush with the plane of the three-claw disc. to check whether it is stable. To test, use a spreader to gently strike around the three-claw disc. If the oil splashes outward from the circumference of the disc, it proves that there is still a gap between the three-claw disc and the bottom cover, which should be cleaned and repaired. (3) Then install the middle circular plate and the circular plate in sequence, and the detection method can still use the above method. (4) Finally, install the hollow eccentric shaft, spherical bracket and main shaft. When the hollow eccentric shaft is hoisted, the counterweight of the large gear should be placed above the small bevel gear, so that the outer ends of the bevel gear are aligned. During the period, three data were measured successively: the gap between the conical bevel teeth a; the gap between the main shaft and the taper sleeve b; the gap c between the end face of the hollow eccentric shaft and the bottom of the spherical shoe. (5) Considering the above three data in a unified way, the gap piece for installing the taper bearing, that is, the position of the three-claw disc and the bottom cover of the machine is determined. The gap sheet is made of ordinary plates, but it is possible to avoid the superposition of steel plate thickness to complete. If the gap is greater than 3.5mm, it should be considered to reduce 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 on-site experience.
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