Key words: floating seal; crusher; damage; phenomenon; measure
The floating seal is a high-performance seal that combines a floating ring seal, a comb seal and a gap seal. It uses a professional de-weighting device to ensure the best clearance of the seal, and uses oil film tension and multiple sealing technology to effectively prevent it. Leaked. This sealing technology is not only simple in structure, flexible in form, but also highly adaptable. At present, floating seals have been applied in various devices such as generators, blowers, steam turbines, compressors, and shearers and crushers. In specific applications, the floating seal has good heat resistance, cold resistance, durability, high speed and pollution resistance. In China's coal mining equipment, the floating seal is mainly used on the rocker and crusher of the shearer. Our company mainly undertakes the coal mining machine of Joyi Company. In the process of application and maintenance, the phenomenon of floating seal damage is easy to occur in the shearer crusher, which not only affects the normal operation of the shearer, but also wastes A lot of manpower and material resources have brought serious losses to coal mining enterprises. Below, we will introduce the analysis of the phenomenon and preventive measures of the floating seal of the Jiuyi shearer crusher.
1. The phenomenon that the floating seal of Jiuyi shearer crusher is easy to be damaged
1. The working principle of the floating seal. In the crusher of the Jiuyi shearer, the floating seal is mainly composed of a metal seal and a rubber O-ring. Among them, a set of metal sealing rings and rubber O-rings are installed on the sealing base of the frame in the crusher, and another set of sealing rings are placed on the sealing base of the driving head of the crusher. In the specific application process, when the crusher is installed, the two O-rings will be deformed to produce a certain elastic force. Under the action of the elastic force, the two metal seals will be pressed together. In this way, when the drum rotates, the metal sealing ring achieves the purpose of sealing by relative operation. If the metal seal is damaged during the sealing process, it can be operated by the rubber seal to prevent the leakage of the lubricating oil and the entry of dust.
2. The phenomenon of the floating seal of the Jiuyi shearer crusher is easy to be damaged. In the process of coal mining, the crusher of the shearer can crush large pieces of coal to meet the requirements of coal mining and coal transportation. However, in the process of use, the crusher has a serious oil leakage due to the damage of the floating seal. When we dismantled the crusher of the well, we found that the rubber O-ring in the crusher had been damaged and lost. In this case, there is a large gap between the metal sealing ring in the crusher and the sealing base, and the lubricating oil in the crusher is lost from the gap between them. Through the observation of the work of the crusher, we found that the main reason for the damage of the floating seal is the deterioration of the lubricating oil quality of the crusher. During the working process of the crusher, the quality of the lubricating oil in the crusher will decrease with the loss of time, which will affect its lubricating performance. In this state, the resistance of the crusher drum will increase when operating. When the mutual frictional resistance between the metal sealing rings is greater than the mutual frictional resistance between the rubber O-rings and the metal sealing ring, the two metal sealing rings will not rotate relative to each other, and the rubber O-rings and metal The sealing ring is relatively operated, so that the rubber O-ring seal will be pulled, worn or even broken during operation.
Second, the preventive measures for the fragile phenomenon of the floating seal of Jiuyi shearer crusher
In order to improve the working efficiency of the shearer crusher, we must take some precautions to reduce the probability of floating seal problems. From the above discussion, we can see that the main cause of damage to the floating seal is the deterioration of the quality of the crusher lubricant. Therefore, we must take some measures to improve the condition of the lubricant. Specifically, we can take the following measures.
1. Control the oil change interval of the crusher. In the specification of the Jiuyi shearer, the oil change intervals of the rocker gearbox of the shearer and the gearbox of the crusher are clearly defined, and their oil change intervals are 250 hours. However, in the actual application process, we found that the lubricating oil in the rocker gearbox in the shearer is still in good condition and the lubrication performance is relatively high when the oil change cycle is reached. However, when the gearbox in the crusher has not reached the oil change cycle, its lubricating oil condition has begun to deteriorate sharply, which seriously affects the normal operation of the crusher. In view of this, based on work experience, we recommend changing the oil change interval of the gearbox in the crusher to about 120 hours, thereby improving the condition of the crusher lubricating oil and avoiding serious damage to the floating seal due to the deterioration of the lubricating oil quality.
2. Make sure there is enough cooling water in the crusher. During the use of the crusher, long-term operation will accelerate the aging of the rubber seal ring and further reduce the quality of the lubricant. Therefore, we need to ensure that there is enough cooling water in the crusher. In addition, we can also make two small holes in the shroud of the crusher drum, so that the cooling water in the crusher can be sprayed onto the drum through the two holes on the drum guard, so that it can play a good dust removal function and avoid dust. Enter the drum of the crusher to avoid damage to the floating seal.
3. Management and maintenance of the shearer crusher. Strengthening the management and maintenance of the crusher is also an important measure to solve the damage of the floating seal. For example, if the shearer is deactivated for a long time, when it starts again, we need to first rotate the drum of the crusher, and then start after the parts of the crusher are well lubricated. In addition, in the daily work of the crusher, we must strengthen the management of the lubricating oil, regularly check the quality of the lubricating oil, and once the problem is found, it should be processed and replaced in time to ensure the safety of the floating seal.
Conclusion
In summary, the crusher plays an important role in the coal production process. In the process of using the crusher, the floating seal can play a good sealing function to avoid dust entry and oil leakage. However, from the reality, in the operation of the crusher, the floating seal is prone to damage, resulting in serious oil leakage, which affects the normal operation of coal production. In view of this, we need to take some measures to ensure the quality of the lubricating oil in the crusher, thereby reducing the occurrence of floating seal damage, promoting the rapid development of China's coal mining industry, and making it better serve China's economic and social development.
The Tapered Roller Bearing belongs to the separation type bearing, and the inner and outer rings of the bearing have a conical raceway. This type of bearing is divided into single, double and four row tapered Roller Bearing according to the number of the roller. The single row Tapered Roller bearing can bear the radial load and the single direction axial load. When a bearing is subjected to a radial load, an axial force will be produced, so another bearing that can withstand the axial force of the opposite direction is needed to balance it.
There is a single row tapered roller bearing outer ring, the inner ring and a conical roller by maintaining a basket frame into the inner module. The outer ring can be separated from the inner ring assembly. According to the standard of the ISO tapered roller bearing dimension, any standard type tapered roller bearing outer ring or inner ring assembly should be able to achieve international interchangeability with the same type of outer ring or inner ring assembly. For example, the outer ring of the same type should conform to the ISO492 (GB307) rule besides the external dimension and tolerance. The conical angle of the inner ring assembly and the diameter of the component cone must also comply with the relevant provisions of the interchangeability.
Usually, the conical angle of the outer raceway of the single row tapered roller bearing is between 10 degrees ~19 degrees, and it can simultaneously bear the joint action of axial load and radial load. The larger the cone angle, the greater the ability to bear the axial load. The bearing of the big cone angle, the postposition code plus the B, the cone angle between 25 degrees ~29 degrees, can bear a large axial load. In addition, the single row tapered roller bearing can adjust the size of the clearance during the installation process.
The outer ring (or inner ring) of a double row tapered roller bearing is a whole. The two inner ring (or outer ring) has similar small end faces, and the middle has a spacer. The clearance is adjusted by the thickness of the spacer, and the pre interference of double row tapered roller bearings can also be adjusted by the thickness of the spacer.
The performance of the four row tapered roller bearing is basically the same as that of the double row tapered roller bearing, but the radial load of the double row tapered roller bearing is greater than that of the double row tapered roller bearing, and the limit speed is slightly lower, which is mainly used for heavy machinery.
Multi seal double, four row tapered roller bearings, ZWZ provides long life, multi seal double, four row tapered roller bearings. The new design of the bearing is personalized and the traditional design method of the fully sealed bearing is changed. A new seal structure combined with seal and dust-proof is adopted to improve the sealing effect and improve the sealing performance. Compared with open structure bearings, the life of multi seal double and four row tapered roller bearings increased by 20% to 40%, and the consumption of lubricants was reduced by 80%.
Tapered roller bearings are widely used in automobile, rolling mill, mine, metallurgy, plastic machinery and other industries.
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