For the edge-driven ball mill, the pinion and the large gear will produce tooth surface wear after running for a period of time. In order to extend the service life of the gear, the method of changing the gear working face is generally adopted, that is, the non-working surface is adjusted to the working surface, commonly known as "turning over" . After the two tooth faces of the gear are worn, they are replaced. But turning or replacing the big gear is very difficult.
Due to the large diameter of the large gears, the two halves have a misalignment of the butt joints. After the combination, there is an error in the installation of the flanges of the ball mill cylinders. Therefore, the connection bolt holes and the flange holes of the ball mill will have a certain misalignment. It is necessary to re-ream the connecting bolt hole and the large gear flange hole to position the large gear. In the past, the 38-44 manual reamer was used for reaming. In this operation, the quality of the hole processing is not high, and it takes a lot of time and labor intensity. After research and exploration, we chose a magnetic drill to ream the large gear flange.
The specific operations are as follows:
Using two steel plates with a thickness of 20mm, three 38mm holes are drilled and cut into a circular arc with a radius of R1135mm, which is the inner diameter of the large gear flange. It is bolted to the large gear as a magnetic drill. The base plate, such that the fixed steel plate is on the plane of the large gear flange, the magnetic seat drill sits on the steel plate, the drill pipe and the large gear flange are coaxial with the hole to be reamed, the position is adjusted, and a suitable drill bit can be installed. With drill (1).
The selected magnetic drill type is J3Z-HL02-38A, the rated number of revolutions is 115r/min, the maximum stroke is 200mm, the drilling diameter is 38mm, the electromagnetic force is 17000N, and the input power is 1700W.
It takes at least 3 minutes for the magnetic drill to drill one hole, and then handle it with a manual reamer if necessary, so that it takes at most 10 minutes. The eight reaming holes of the large gear can be completed in only 2 hours, which not only ensures the quality of the hole but also shortens the time, reduces the labor intensity of the mechanics, and has great economic benefits. Similarly, the ball mill can also be operated with a magnetic drill when the hollow shaft is reamed.
It can be seen that the ceramic composition of ceramic vitrified bricks, sanitary porcelain, enamel split bricks and ceramic pots is roughly the same, mainly containing quartz and mullite. Among them, ceramic vitrified brick powder has higher glass phase content, followed by sanitary porcelain, while split brick and ceramic flower pot have less glass phase content.
The glass phase content of several ceramic wastes was determined by HF acid solution method for the glass phase content of several ceramic wastes. The test results are shown in 2.
It can be seen from 2 that the glassy phase of the vitrified brick has a higher content of the glass phase, and the porcelain powder is second, and the enamel-opening brick and the ceramic flowerpot contain less glass phase. This is basically consistent with the results of X-ray diffraction analysis.
From the ceramic raw materials, the traditional vitrified brick billet contains more feldspar minerals, the firing temperature is higher, and the liquid phase produced in the firing is more; the billet of the tantalum ceramic product contains more quartz, feldspar minerals. The content is small, and the firing temperature is low, and the liquid phase generated during firing is less. Therefore, the water absorption rate of the vitrified brick is lower, and the glass phase content is higher; while the water absorption rate of the tantalum brick and ceramic pot is higher, the glass phase content is lower, the pozzolanic property of several ceramic wastes and the cement mortar 28d compressive pressure The strength ratio is tested for pozzolanicity of several ceramic wastes according to the requirements of Appendix A of GB/T 2847-2005 "Pozzolanic mixed materials used in cement". The volcanic ash test of several ceramic wastes was qualified.
Several ceramic waste powders were used as the 28d compressive strength ratio test of cement mortar. The results are shown in 3.
It can be seen from 3 that the 28d compressive strength ratio of the cement mortar of the above ceramic wastes is higher than the requirement of the 28d compressive strength ratio of the pozzolanic mixture in the cement industry not lower than 62%. Among them, the 28d compressive strength of cement mortar with vitrified brick grinding powder is relatively high, the sanitary porcelain disc powder is second, and the compressive strength of cement mortar with split brick powder and ceramic inner wall brick powder is relatively low. Comparing Table 2 with Table 3, it can be seen that the glass phase content of ceramic waste is higher, and the compressive strength ratio of cement mortar 28d is also higher.
(1) Ceramic polished brick powder and waste ceramic vitrified brick Although the main components are similar, the former has a high chlorine content and is used for cement mixed materials. Among the four kinds of ceramic wastes such as ceramic vitrified brick waste, porcelain waste, tannin and ceramic waste, the ceramic glass brick waste has a higher glass phase content, the porcelain waste is second, the tannin and the ceramic waste are glass phase. The content is low.
(2) Ceramic vitrified brick waste, porcelain waste, tantalum split brick waste and ceramic ceramic waste have volcanic ash activity, and the compressive strength ratio of cement mortar 28d is higher than 62%. The ceramic vitrified brick is 82.1%, the porcelain waste is 80.8%, the tantalum waste is 78.3%, and the ceramic waste is 77.3%.
The ceramic waste with higher glass phase content has a higher compressive strength of cement mortar 28d.
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