1. The little pineapple snaggletooth
In the daily use of Ball Mill, the little pineapple snaggletooth happens most often, the reasons are as follows:
(1). The little pineapple design strength is weak, and the manufacturing quality requirements is relatively low.
(2). The lubricating of the little pineapple is bad, the mesh is bad which lead to localized wear, bubbling, and material quality coming off. The local stress concentration is worsened which speed up the snaggletooth.
(3). Supercharge caused by the too many steel balls added into the Coal Ball Mill in production primary which lead to the coal ball mill electric current reaches to 130A. Decrease the steel ball loading capacity, keeping the current at around 120A. (the current raises 1A with one ton steel ball added,)
2. The little pineapple tooth surface abrasion
The gear wheel surface generally presents bubbling, peeling, scallops, and such corrosive pitting phenomenon. Besides the little pineapple tooth surface temperature is high which makes the coal grinding ball mill gear teeth attrition condition seriously.
The reasons are as follows:
(1). The coal grinding ball mill protection cover sealing is not good. There is no sealing on the association point of activity and inertia between the Coal Mill hollow shaft and shelter which speed up the ash entering to the big pineapple. The preheater of the boiler is the three branch warehouse, with one way the secondary air of the blower, one way the primary air of the primary air fan. As the primary air pressure is over-high, it blows down the ash accumulated from the smoke side carrying by the preheater heating surface and takes it away. The pipeline weld bond of the hot air system is unqualified which leads to serious leakage. The ash then enters to the wheel gear shield and speed up its attrition.
(2) The alignment pin problem: It is regulated that the temperature difference measured along the little cutter teeth width should be no more than 8??, and the highest temperature on the tooth surface should be no more than 100??. Hit the alignment pin in after the intervals between each part is normal. When the temperature difference is more than 8??, raise the bearing end of low temperature. One of the reasons for the ball mill tooth surface attrition is that the alignment pin is not hit due to the great work amount which is also the reason why some individual little cutter teeth surface is high and the two ends temperature difference is relatively large.
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1) The concrete base weight required is only 3 times of that of other similar machines thus the construction expenses is greatly reduced
2) Small vibration while using and doesn't need shock-absorbing device
3) Large load adjustment scope, so it can run under various environments
4) Can bear very strong explosion pressure
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Based on the provided text, it appears that the information is related to the daily use and maintenance of a ball mill in a coal grinding process. It describes two common issues: the snaggletooth phenomenon and tooth surface abrasion on the gear wheel. It also mentions the reasons for these issues and suggests measures to prevent them.
1. Snaggletooth Phenomenon: This refers to the occurrence of localized wear and material coming off on the gear teeth of the ball mill. The reasons for this phenomenon are explained as follows:
- Weak Design and Low Manufacturing Quality: The little pineapple gear (a component of the ball mill) is designed with low strength and the manufacturing quality requirements are relatively low. This can contribute to its vulnerability and increase the risk of snaggletooth.
- Bad Lubrication and Mesh: Inadequate lubrication and improper meshing of the little pineapple gear can lead to localized wear, bubbling, and material quality coming off. This causes stress concentration, which accelerates the snaggletooth phenomenon.
- Supercharge from Steel Ball Overloading: Adding too many steel balls into the ball mill during production can cause supercharge, leading to higher electric current (in this case, reaching 130A). To prevent this, it is recommended to decrease the steel ball loading capacity and keep the current at around 120A. Additionally, it is mentioned that the current increases by 1A for each ton of steel ball added.
2. Tooth Surface Abrasion: This refers to the wear and corrosive pitting phenomenon on the gear wheel surface of the ball mill. The reasons for this issue are explained as follows:
- Poor Protection Cover Sealing: Inadequate sealing on the association point between the Coal Mill hollow shaft and shelter allows ash to enter the gear wheel area, causing attrition. Specifically, the high primary air pressure in the preheater blows down the ash accumulated from the smoke side, and pipeline weld bond leakage in the hot air system contributes to the problem.
- Alignment Pin Problem: The alignment pin should be properly hit in after specific intervals between each part for temperature control. If the temperature difference measured along the little cutter teeth width exceeds 8℃, the bearing end of low temperature should be raised. Failure to hit the alignment pin due to a large workload can lead to high temperature on some individual cutter teeth surfaces and a relatively large temperature difference between the two ends.
Overall, the text emphasizes the importance of factors such as design, manufacturing quality, gear lubrication, steel ball loading capacity, protection cover sealing, and alignment pin usage in minimizing snaggletooth and tooth surface abrasion issues in a ball mill.
Regarding the second part of your text, it seems to mention the advantages and features of a ball mill, including:
1) Lower concrete base weight requirement compared to similar machines, reducing construction expenses.
2) Less vibration during use, eliminating the need for shock-absorbing devices.
3) Large load adjustment range, allowing the mill to operate in various environments.
4) Ability to withstand strong explosion pressure.
5) Use of new materials and craftsmanship on the grinding roller, ensuring a long service life and low maintenance cost.
6) The ability to start and stop with load or without load due to the gap between grinding parts.
However, the last sentence is incomplete, and it mentions rotary kilns but does not provide any information related to them.