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xiaoxiaoxuan wrote 201 articles and got 9 comments. The last article was submitted on 19/08/17

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How to choose the important parameters of coke ultra-fine grinding sliding main bearing?

Date 26/07/17 06:28 Views 35 Сomments 0

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Coke ultra-fine grinding sliding main bearing supporting the ultra-fine grinding of the weight of the whole body, its performance directly affects the normal operation of ultra-fine grinding. The bearing capacity and damage form of the main bearing is the design, manufacture, installation and use of the coke superfine grinding main bearing.
Coke ultrafine mill sliding main bearing supporting the ultra-fine grinding of the weight of the whole body, its performance directly affects the normal operation of ultra-fine grinding. The main bearing bearing capacity and damage form is the coke superfine grinding main bearing design, manufacture, installation, use should pay attention to the two issues. This article from the main bearing of several important parameters to discuss how to select them in order to improve the bearing capacity of the main bearing and effectively prevent the bearing wear, heat, burn the phenomenon of the occurrence.
1) ultra-fine grinding the main bearing width ratio L / D selection
According to the theory of hydrodynamic lubrication, it can be seen that the L / D ratio of the sliding bearing is one of the important factors that affect the bearing capacity of the bearing. When the L / D increases, the bearing capacity of the oil film will increase, L / D selection is mainly to consider the bearing capacity of the bearing. But the actual selection of L / D, should also take into account the bearing side leakage problem. For cement mill and wet raw material mill, generally according to the size of the feed to determine the diameter of the hollow shaft, when the hollow shaft diameter is determined, and then according to the specific pressure to determine the width of the spherical tile. The diameter ratio L / D of the ultrafine grinding is generally 0.25 ~ 0.35, and the width ratio of cement mill and raw material is L / D = 0.35 ~ 0.55.
2) Hollow journal shoulder and shoulder pad on both sides of the gap value
Ultra-fine grinding operation to produce a lot of heat, after the heat to elongation, when the ultra-fine grinding stop, the cylinder temperature to decline, so that shorten the simplified. Therefore, in the design of ultra-fine grinding must consider the thermal expansion and contraction of the cylinder, the problem is through the hollow shaft journal shoulder pad and the gap between the two sides to solve the gap. On the use of ultra-fine grinding, if found to keep the gap value is too small lead to overheating, can be the end of the bearing pad on the side of the cylinder side to increase the angle to prevent the hollow shaft shoulder and the end of the pad to ask the chamfer of the arc In the case of thermal expansion after the collision, while taking into account other cooling measures to reduce the amount of thermal expansion of the grinding body, reducing the main purpose of overheating burner.
3) bearing pad and hollow shaft journal with the backlash
In order to make the bearings get good lubrication, reduce friction, prolong life, bearing and hollow shaft journal between the backlash must have the appropriate value. The gap between the General Assembly there will be oil and vibration, oil wedge pressure, oil film is difficult to form, bearing and journal friction and heat, burn the bearing and shaft. And too small backlash, will reduce the size of the oil wedge, lubricants can not successfully enter the contact area, resulting in reduced oil consumption, bearing cooling difficulties, bearing temperature.
In addition, the combined backlash must form a more uniform wedge-shaped backlash, which contributes to the introduction of oil, and the approximation of the thick or stepped backlash is not conducive to the introduction of oil, almost equal thickness of the large side of the oil To the sides of the tile side of the tendency to pour, is not conducive to the formation of oil film.
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