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Xiangyang Yingpai Ronghua Bearing Co., Ltd.
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Sliding shoe bearing technology solutions to transform the mill Rolling mill
With the large-scale, large-diameter cement grinding mill equipment more than 3.8m in diameter tube mills are using sliding shoe bearing technology , the sliding shoe bearing alloy buses bearing large, because the contact surfaces of the bearing in the mill machine cylinder diameter, bearing diameter increased, the line speed of the bearing more than doubled , friction torque ratio hollow shaft grinder mill increase in the rotation produced more than doubled , increasing friction power, and therefore sliding shoe bearing mill bearing power consumption needs of about 15% , the power required to overcome the friction torque is calculated radius of gyration mill revolutions × × × coefficient of friction of bearing the weight of the mill , easy to see, bearing the radius of gyration the increase will directly lead to increased friction moment , resulting in increased power consumption . In addition , there are more part of the sliding shoe bearing friction exists temperature is too high , resulting in the need to stop grinding, cooling, make the mill operating rates decline . To this end we propose should be transformed as soon as possible .
Sliding shoe bearing cylinder mill work in surface contact with the sliding bearing , under the action of positive pressure , oil deterioration phenomenon is very serious. With the ball sliding shoe temperature, the viscosity of the lubricant to reduce the carrying capacity decline and even cause dry friction , but also a serious Burnt . Shoe and larger amount of heat from the temperature rise of the main slide and collide with each other inside the grinding mill produced between the portion of material and gas away from the part dissipated by the cylinder , the cylinder and the heat is transmitted to the slide Sheung Wan, sliding shoe with an increasing temperature . To solve these problems , my company after careful study, access to large amounts of data , with many years of experience in production , transformation program to develop the following :
A grinder to remove the shoe sliding bearings , bearing support will be achieved to reduce the mill bearing friction moment .
Because the cylinder and Rolling line contact at work, fuel consumption is small, oil deterioration phenomenon is very small. By looking for information , we know that the coefficient of friction is 0.04-0.035 sliding bearings , rolling bearing and the friction coefficient of 0.0025 , a difference of nearly 16 times . Therefore , after the transformation , we can reduce the friction torque main bearing swivel to achieve the purpose to reduce the use of motor power , saving energy , calculated friction torque converter motor power is:
Mill weight load factor × × × coefficient of friction bearings turning radius × mill revolutions / 97360 ( power conversion factor )
Φ4.2 × 13m mill three kinds of bearings in the form of electrical power consumed :
Rolling : 630.000kg × 0.7 × 0.0025 × 1.00cm × 15.6 ÷ 973.60 = 17.66kw.h
Bus alloy ( hollow shaft ): 630.000kg × 0.70 × 0.035 × 1.00cm × 15.6 ÷ 973.60 = 247.31kw.h
Sliding shoe bearing : 630.000kg × 0.70 × .035 × 2.00cm × 15.6 ÷ 973.60 = 494.6kw.h
For example : Rolling Ф32 × 13m mill ; motor power 1600kw, grinding 135t. Ф4213 mill power 3550kw, grinding should be installed 280t, now calibrated loading is 230t.. As a result of the increase seen sliding shoe bearing and mill turning diameter grinding loading corresponding decrease of nearly 50t, this is a more prominent effect on Mill production , from three different forms bearing motor power consumption look, babbitt bearings Rolling consume more electrical power than 198kw, sliding shoe bearing Rolling consume more electrical power than 477kw, to this end , will be transformed into a rolling bearing sliding shoe bearing will be of great energy saving potential.
Φ3.8 × 13m mill three kinds of bearings in the form of electrical power:
Rolling : 480.000kg × 0.7 × 0.0025 × 1.00cm × 16.3 ÷ 973.60 = 14.06kw.h
Bus alloy ( hollow shaft ): 480.000kg × 0.7 × 0.035 × 1.00cm × 16.3 ÷ 973.60 = 196.88kw.h
Sliding shoe bearing : 480.000kg × 0.7 × 0.035 × 2.00cm × 16.3 ÷ 973.60 = 393.77kw.h
For example : Ф3.2 × 13m mill ; motor power 1600kw, grinding 130t. Ф3.8 × 13m mill power 2500kw, grinding should be installed 225t, now calibrated loading is 174t.. As a result of increased visibility and sliding shoe bearing diameter rotary mill , the grinding media loading is reduced corresponding to 51t, which is more prominent on the mill production , from three kinds of different forms of electrical power consumed by the bearings see , babbitt bearings Rolling consume more electrical power than 182kw, sliding shoe bearing Rolling consume more electrical power than 379kw, to this end , will be transformed into a rolling bearing sliding shoe bearing will be of great energy saving potential.
2 transformation method
Method ( 1 ) : In the original installation location on the sliding shoe bearing design trunnion ring , ring in the lower bracket design groups supporting wheel , each supporting wheel design of the two rollers, idler roller bearing mounted on both ends of care one on each side of the roller link plate design with a shaft fixed to the connecting plate , and the other roller is also designed so that the connecting plate is designed to nearly triangular, with the base connected to a pin fixed to the base . When the mill rotates , the role of positive pressure , the automatic alignment center . Because the design into consideration the carrying capacity , each roller design into two , to ensure that there are four end mill shell supporting wheel support , safe and reliable, reduce wear and increase the service life .
Method ( 2 ) : Using the sliding shoe bearing inner ring with mounting rolling bearings , rolling elements and cage , outer ring installed in the main bearing housing , this transformation method is relatively simple , slightly higher investment , the relatively large size bearings , running stable. Transformation, manufacturing time 50 days 60 days , on-site installation of one week -10 days.
3 mill instead of rolling bearing characteristics LMGU :
3.1 reduce the operating current
Reasonable choice Rolling mill applied , when the friction coefficient is only 0.0025 rotation , the sliding bearing is 1/16 . Sliding shoe bearing motor power consumption by nearly 14 %. By calculating and using examples , turning around 0.5-7 % of Rolling mill motor power consumption is only supporting the motor power , which would reduce the normal operating power consumption, achieve savings in electricity costs , reduce production costs, improve economic efficiency of enterprises goals.
3.2 reduce the starting current
Due to the large sliding friction bearings , shaft at startup phase friction between the bearing and the acceleration principle reach up to a fixed number of revolutions of the motor torque to overcome a lot of friction , usually starting current is 5 to 6 times the operating current much. After rolling bearing , the starting current is only about two times the operating current , the larger reason for the surplus power the motor when the old mill is working properly because of sliding bearings . After the main bearings use rolling bearings supporting the motor power can be reduced or increased load capacity grinding mill , both to improve the motor efficiency , reducing wasted effort , but also increase the production to Taiwan .
3.3 saves a lot of oil
As the sliding shoe bearing lubrication is the use of high and low voltage supply , usually in the pre- start and stop grinding mill with high-pressure system in the normal operation of the low-pressure fuel system . Low pressure system piping design into three -way , two-way , respectively, which pass into the oil pan two years before the shoe , slip rings and oil cooling dynamic bearing lubrication ; another road leads to the shower hose shoe cover side of the slip ring cooling the upper portion of cooling lubricants consume large . After the energy-saving bearings, oil lubrication station can be canceled , sump lubrication , bearings after rolling through the lower part of the oil tanks , oil will bring , both to meet the lubrication requirements. Oil replaced every six months , to be replaced once just 200kg . If roller bearings manner , using low-pressure fuel system between the trunnion ring and roller, when transmitted to the roller barrel temperature in the lubricant , reducing friction power consumption, reduced friction and heat, while lubricating after rubbing the oil , which can heat away , the cooling water in the lubrication oil station the role of the temperature down to ensure good operating rate . Requires a small amount of circulating oil can. Lubricants can save 80%.
3.4 increase the grinding load , improve mill output
Since the mill operating current decline of about 15% , so you can increase the amount of grinding load above 10% , the inevitable increase in grinding time to achieve the effect of improving the mill production . Taiwan when production increased about 15 %, the production costs will drop, tons of cement margins will improve .
End 3.5 overhaul, very easy to clean bearings
Because the bearing rolling elements and cage semi- circle of all exposed, oil and debris are easy to clean. The GB bearings, the whole outer ring moves a small amount of rolling elements and cage can not be fully exposed, and therefore can not be all of the oil and clean the debris will affect future role .
3.6 Rolling can replace parts
LMGU rolling bearing inner ring , an outer ring , cage and rolling elements of the four components, each component can be replaced at any time , avoiding the old bearings every bad one component , it is necessary to replace the entire bearing shortcomings . To make this bearing to the series, standardization of direction , I assumed the People's Republic of building materials industry standard drafting " cement industrial bearing ( bearing ) " through the consideration of industry experts, by the National Development and reform Commission approved on December 1, 2006 start promulgated and implemented.
3.7 reduce maintenance , improve the operation rate
Bearing life is generally 1-3 years , the mill spindle will wear , if care is not good, some manufacturers have to change a few months bearing . When work does not allow sliding bearings lack of lubrication , cooling water or excessive bearing temperature rise occurred. Once the downtime would occur , so running low prevalence of the phenomenon . After rolling bearing as long as a small amount of dry oil filling in time , will be able to operate normally , no special care mill, and the actual useful life of rolling bearings in 8 to 12 years , you can be assured. This will reduce the amount of maintenance and downtime part , improve equipment operation rate .
3.8 Cooling water conservation , improved sanitation
After rolling bearing , wet mill and cement raw mill can save bearing circulating cooling water installations , does not affect bearing life ; Rolling Block after dry oil lubrication , no oil contamination occurs, improved sanitation .
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