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1. The mating contact angle between the spherical tile and the hollow shaft journal It is considered that the mating contact angle of the spherical tile and the hollow shaft journal is larger than the small angle, at least not <60 degrees. In fact, because the national building materials industry standard JC334.1-94 4.3.2.1c, its "contact wrap angle should be <35 degrees. This is based on a large number of practices. In theory, the Zui small wrap angle depends on The material of the bearing alloy, because the bearing alloy is a soft material, the bearing alloy produces a certain deformation under the action of the simplified gravity, so the contact wrap angle is too small and not good. When the contact wrap angle is small, the hollow shaft can be effectively ensured. The journal does not hold the watts under normal working conditions. Moreover, since the contact wrap angle is relatively small, there is a backlash with a large angular range, which ensures that the lubricating oil can smoothly enter the contact area, thereby ensuring lubrication of the contact area. It is beneficial to the heat dissipation of the hollow shaft journal and the spherical tile. It can be seen that the contact wrap angle should be <35°, and the treatment of the bush waffle surface becomes faster and easier to improve the working quality of the contact surface.
These misunderstandings have hindered the progress of the work in the process of mining machinery mining and processing, so in the future production process, we must pay great attention to these misunderstandings and prevent problems before they occur.
2. Some people think that the ball mill is better than the matching side gap between the spherical tile and the hollow shaft journal. When the hollow shaft is not easy to be introduced into the oil film, or when the surface of the spherical tile is burned, it often appears that the oil cannot smoothly enter the contact area between the hollow shaft journal and the spherical tile. Many people think that it is a spherical tile and a hollow shaft journal. The matching side gap is too small, but it may not be. The matching side gap between the spherical tile and the hollow shaft journal is clearly defined in the national building materials industry standard JC334.1-94, 4.3.2.la. The matching side gap must form a relatively standard wedge-shaped backlash, which contributes to the oil guiding, and the similarly thick or stepped side gap is not conducive to the introduction of oil. Almost equal thick large backlash has the tendency to pour oil to the sides of the tile, which is not conducive to the formation of oil film.
3. Spherical tile opening oil tank, oil pit Some people advocate opening the oil groove on the spherical tile, and the large area contact area is opened, so that the oil can easily enter the contact area along the oil groove. The form of the oil groove is "w" shape, and some are openings. 8" glyph, some are closed "8" shape, and some are still open the oil tank and open the oil pit and so on. Moreover, the oil groove and the oil pit reduce the effective contact area, and more importantly, the full width contact n cannot be ensured in the direction of the width of the tile, and the local contact in the width direction causes the contact stress to concentrate, which forms the oil film. It is unfavorable. In fact, this practice cannot pass the building material industry standard JC334.1-94, 4.3.2.1. Acceptance of the requirements specified in b. A large number of facts prove that there are many spherical tiles, and there is no oil tank. There is no abnormality after long-term operation. Therefore, from all aspects of analysis and practice verification, the oil tank is not very good, on the contrary, some balls and watts started by the high-pressure pump, you must be careful to open the oil tank, if you are not careful, it may cause the spherical surface tile to be scrapped.
4. Some people often do some treatment on the surface of the hollow shaft journal when manipulating the spherical tile. Common practice is to first use a multi-strand straw rope and twist the fine sandpaper, bypass the hollow shaft journal one turn, pull it by two people, then use the multi-strand straw rope to pull back and forth, and polish the hollow shaft journal. deal with. Some use sandpaper to repeatedly sand the hollow shaft journal. In fact, this method is not desirable because it will cause the hollow shaft journal to lose roundness and become a prismatic structure, which is not conducive to the formation of oil film. In fact, after long-term operation of the hollow shaft journal, in addition to the bearing of the bearing alloy on the surface of the hollow shaft journal due to severe burning, the roundness of the hollow shaft journal is already in good condition, generally does not need to be large. The so-called polishing treatment of the area. Even if a severely burnt tile is used to bond the bearing alloy on the mandrel shaft journal, only a partial, slight surface treatment is required to prevent the roundness of the hollow shaft journal from being broken.
5. After the long-term operation of the spherical tile, it is necessary to periodically perform the shaving of the tile surface. Some people think that after the spherical tile is operated for a certain period of time, the contact angle with the hollow shaft journal will become larger, and the contact surface of the tile will become very bright due to normal wear. The original oil spots will no longer exist. Such tiles will lurk in the danger of holding tiles or burning tiles during use, so regular tile surface shaving is required. In fact, during long-term operation, the contact surface between the spherical tile and the hollow shaft journal has been very well worn, which is difficult to achieve with any high-quality scraping. Therefore, the spherical tile in normal use is shaved. It is not enough. As for the long-term operation of the spherical tile, the contact angle with the hollow shaft journal does not become large, because during the operation, the contact between the hollow shaft journal and the spherical tile is not strict with the uncertain dynamic load. The ground is limited to the wrap angle of the initial run. These uncertain loads are enough to cause the enlarged contact wrap angle to wear at any time, thus automatically limiting the expansion of the true wrap angle. As for the loss of the initial oil point on the spherical tile, it is more conducive to the formation of the oil film. In fact, there are spherical tiles that have been in operation for many years and have not been subjected to any scraping treatment.
5 misunderstandings in the main bearing processing of ball mill
In the installation, repair and maintenance work of the main bearing of the tube mill industrial tube mill, there are often some wrong methods. Some practices are not only invalid, but harmful. Let’s discuss the mistakes brought about by the cement grinding equipment. Some damage.