Exposed gear structure special for aluminum oxide mill and installation and operation method of exposed gear structure

Abstract

The invention belongs to the technical field of transmission systems of ore grinding equipment in the aluminum oxide industry, and particularly discloses an exposed gear structure special for an aluminum oxide mill and an installation and operation method of the exposed gear structure. A first half gear and a second half gear are combined together to form a complete exposed split gear, the combination face of the first half gear and the second half gear is in a half contact type, the combination face of front-row combination bolts is in a contact type, and the combination face of rear-row combination bolts is in a recessed non-contact type. During installation, refined bolts of a combination bolt set between the contact type combination faces of the first half gear and the second half gear are installed firstly, then the combination bolt set between the contact type combination faces of the first half gear and the second half gear is installed, and after the mill operates for one week, under the hot state, large gear combination bolts are tightened again. The problems that in the mill operation process, the gear combination faces are opened due to thermal stress, and consequently mill vibration, gear tooth breakage, bolt expansion breakage and the like are caused are solved, the influence of thermal stress on a large gear is overcome, and stable operation of the mill is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of transmission systems for ore grinding equipment in the alumina industry, and specifically discloses a special open gear structure for alumina mills and an installation and operation method thereof. Background technique [0002] With the rapid development of China's electrolytic aluminum industry, China's alumina industry has also achieved rapid development, and the alumina grinding equipment has shown a trend of large-scale. At present, the largest size of the grinding machine used in the alumina industry in China is Φ6×9.5m overflow type Ball mill, due to the special nature of the alumina industry, the internal temperature of the alumina mill is as high as 95°C, while the surface temperature of the large gear is about 50°C. As the specifications of the mill increase, the thermal stress caused by the temperature difference will affect the The impact of the split gear is prominent, which leads to the openi...

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Problems solved by technology

[0002] With the rapid development of China's electrolytic aluminum industry, China's alumina industry has also achieved rapid development, and the alumina grinding equipment has shown a trend of large-scale. At present, the largest size of the grinding machine used in the alumina industry in China is Φ6×9.5m overflow type Ball mill, due to the special nature of the alumina industry, the internal temperature of the alumina mill is as high as 95°C, while the surface temperature of the large gear is about 50°C. As the specifications of the mill increase, the thermal stress caused by the temperature difference will affect the The impact of the split gear is prominent, which leads to the opening phenomenon of the joint surface of the split gear of the large-scale mill, which not only causes permanent deformation or even bursting of the joint bolt of the split gear, but also causes deformation of the teeth at the joint surface of the split gear. The meshing of the large and small gears is abnormal, causing the vibration of the mill

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