Slide shoe mill to tumbling bearing mill transformation skills plan

With cement grinding equipment for large-scale, large-diameter mill tube diameter above 3.8m are used in the choice of sliding bearing technology, the sliding bearing alloy bearing alloy is large, because the bearing touch surface is in the mill The outer diameter of the cylinder, the bearing diameter increases, the thrust of the bearing thrust washer more than doubled, the friction torque of the mill during the rollover episodes more than double the hollow shaft mill, the conflict power consumption Add, so the friction bearing bearing mill power consumption needs about 15%, to overcome the conflict resistance torque required power accounting for the mill component × reverse radius of the bearing × mill rotation × collision coefficient, aluminum-tin alloy Difficult to see the bearing, the bearing radius of the reverse addition will directly lead to the friction hydraulic dedicated oil-free bushing resistance torque added to form a power consumption added. In addition, there are more parts of the slide bearing conflict temperature rise is too high, which led to stop the demand, cooling, reducing the operating rate of the mill. Therefore, we propose that we should make the transformation as soon as possible.

Lubricator bearing mill in the operation of the cylinder and the sliding bearing is the surface touch, under the effect of positive pressure, fat deterioration of the appearance of very serious. Follow the ball mill temperature increase, so that the viscosity of the oil is reduced, the load can decline, and even the formation of dry friction, but also severe burning. The temperature rise of the shoe mainly comes from the heat generated by the collision and sliding of the grinding bodies inside the mill and is partly carried away by the material and the gas and partly emitted by the cylinder and the heat of the cylinder reaches the slippery Ring, slipper temperature added. In order to deal with these questions, our company through careful study, access to a lot of materials, with many years of production experience, develop the following skills transformation plan:

1 Remove the sliding mill bearing support, instead of rolling bearing support mill bearing friction torque reduction will be completed.

Because the cylinder and rolling bearings in the operation is a line touch, with a small amount of oil, oil deterioration of the appearance of small. By looking for the material, we know that the coefficient of friction of the sliding bearing is 0.04-0.035 and the coefficient of friction of the rolling bearing is 0.0025, a difference of nearly 16 times. Thus, after the transformation, it is possible to reduce the main bearing reversal conflict resistance torque, to reduce the motor transport rate of effort, save energy intent, the conflict resistance torque conversion motor power accounting method is:

Mill component × load factor × collision coefficient × bearing reverse radius × mill revolutions / 97360 (power conversion factor)

Φ4.2 × 13m mill 3 kinds of bearing methods consumed by the motor power:

Rolling bearings: 630.000 kg × 0.7 × 0.0025 × 1.00 cm × 15.6 ÷ 973.60 = 17.66 kw.h

Bus alloy (hollow shaft): 630.000 kg × 0.70 × 0.035 × 1.00 cm × 15.6 ÷ 973.60 = 247.31 kw.h

Slide bearing: 630.000kg × 0.70 × .035 × 2.00cm × 15.6 ÷ 973.60 = 494.6kw.h

For example: rolling bearings Ф32 × 13m mill; motor power 1600kw, grinding body 135t. Ф4213 mill power 3550kw, grinding body should be loaded with 280t, now the standard load is 230t. Seen because of the choice of sliding bearings and mill reverse diameter addition, the corresponding reduction of grinding body load of nearly 50t, which is an outstanding impact on mill output value from 3 different ways of bearing the cost Motor power to see, pasteurized alloy bearing roller bearing cost more than motor power 198kw, slipper bearings bearing cost more than rolling motor power 477kw, for this reason, the slide bearing into a rolling bearing will have great potential for energy saving .

Φ3.8 × 13m mill 3 kinds of bearing method of motor power:

Rolling bearings: 480.000 kg × 0.7 × 0.0025 × 1.00 cm × 16.3 ÷ 973.60 = 14.06 kw.h

Bus alloy (hollow shaft): 480.000 kg × 0.7 × 0.035 × 1.00 cm × 16.3 ÷ 973.60 = 196.88 kw.h

Slide 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 body 130t. Ф 3.8 × 13m mill power 2500kw, grinding body should be installed 225t, now calibration load is 174t. Seen because of the choice of slide bearings and mill reverse diameter addition, grinding body corresponding reduction in the amount of loading 51t, which is an outstanding impact on mill output value from the three different methods of bearing the motor cost Power, Babbitt bearing alloy bearing cost more than rolling motor power 182kw, slipper bearings bearing cost more than the motor power 379kw, for this reason, the slide bearings will be transformed into rolling bearings will have a great energy saving potential.

2 ways to transform

Approach (1): In the original position of the equipment slide bearing planning ring, the lower part of the care ring planning two sets of wheels, each set of two roller care planning roller, the roller bearing equipment at both ends of the roller care Each side of the roller is planned with an adapter plate fixed with a shaft on the adapter plate, and the other roller is so planned that the adapter plate is planned to be nearly triangular with the bottom engaging with a fixed base. When the mill tumbling, under the effect of positive pressure, take the initiative to find the center of the circle. Because planning takes into account the carrying capacity of each set of roller into two plans to ensure that one end of the mill cylinder support four wheels, safe and reliable, reduce wear and tear, improve the service life.

Approach (2): the use of slipper bearings roller device rolling bearing inner ring, rolling body and cage, outer ring device in the main bearing, this method is simpler transformation, a slightly higher funding, the bearing standard is relatively large, Work smoothly. Transformation, production time 50 days -60 days, on-site equipment 1 week -10 days.

3 mill to use LMGU rolling bearing features:

3.1 reduce operating current

Selection of reasonable rolling bearings used in the mill, the onset of the rolling conflict coefficient of only 0.0025, 1/16 of the sliding bearings. Sliding shoes bearing motor power consumption of nearly 14%. Through accounting and practical examples, when the mill tumbling rolling bearings consumed motor power accounted for only about 0.5-7% of the motor power, so it will reduce the normal operating power consumption, saving electricity costs, reduce production costs, improve business efficiency Policy.

3.2 reduce the starting current

Because of the large frictional resistance of the plain bearing, the shaft and the bearing collide with each other to stop when the principle of acceleration arrives at a fixed number of revolutions at the time of starting. The motor must overcome a large collision resistance torque, and the starting current is usually 5 to 6 times of the operating current many. The choice of rolling bearings in the future, the starting current is only about 2 times the operating current, the normal operation of the old mill adequate power when the abundant power that is because of the reasons for sliding bearings. The main bearing to use rolling bearings in the future, to reduce the matching motor power or add grinding mill body load, both to improve the motor efficiency, reducing no painstaking, but also to improve Taiwan's output value.

3.3 save a lot of glossy oil

Because the smoothness of the sliding bearing is the choice of high and low pressure oil supply, usually before the mill start and stop grinding with high pressure system, in normal operation by the low pressure system for oil. Low pressure system pipeline planning into three, during which two separate from the oil pan before passing two sliding shoes, cooling slip ring and lubrication oil bearing; the other way to slipper cover over the drain pipe, the slip ring The upper part of the cooling cooling, consume a lot of glossy oil. Energy saving through tumbling bearings, you can withdraw thin oil smoothing station, the oil tank smooth, rolling bearing body in the lower oil pool leading to, it will bring smooth oil, both to meet the smooth requirements. Six months to replace a glossy oil, replace only 200kg can be. If the roller bearing method is adopted, the low pressure system is used between the support ring and the idler roller. When the cylinder temperature is transmitted to the idler roller, the frictional power is reduced under the effect of the lubricating oil to reduce the conflict and generate heat while the smooth Oil through the conflict at the time, can take away the heat between the effect of cooling water at the thin oil station, the temperature down to ensure a good equipment operating rate. A very small number of circulating oil can be. Can save 80% glossy oil.

3.4 Add grinding body load, improve mill output

Because the operating current of the mill is reduced by 15%, the loading capacity of the grinding body can be increased by 10% or more. The addition of the grinding body must reach the effect of increasing the output value of the grinding machine stage. When the output value of Taiwan increases by 15%, the production cost will be reduced and the profit margin of cement will improve.

3.5 by the end of repair, cleaning bearings is very convenient

Because the rolling body and the cage half full disclosure, waste oil and debris are simple and clean. The GB bearings, the whole outer ring movement is small, rolling bodies and cages can not be fully revealed, it is impossible to clean all the clean oil and debris, will affect the future results.

3.6 Rolling bearings can replace parts

LMGU rolling bearings from the inner ring, outer ring, cage and roll body composed of four parts, can replace each part at any time, to avoid the old bearing a component for each bad, it is necessary to replace the shortcomings of the entire set of bearings. In order to make this kind of bearing to the direction of serialization and standardization, our company has assumed the drafting work of the building materials industry standard "bearing bush (bearing) of cement industry" of the People's Republic of China, passed the examination of experts in the industry, and carried out by the state of the People's Republic of China And change the committee agreed to December 1, 2006 began to be promulgated.

3.7 reduce the amount of repair, improve operating rate

Sliding bearing service life is usually 1 to 3 years, the mill spindle will wear, if the maintenance is not good, some manufacturers have to change a few bearings a few months. Plain bearings are not allowed to show normal operation short and shiny oil, cooling water or bearing the appearance of high temperature rise. Once the attack will be shut down for repair, so the prevalence of low operating rates. The choice of rolling bearings in the future only a small number of timely replenishment of dry oil, you can normal operation, does not require specialized care mill, and rolling bearing the actual useful life of 8 to 12 years, users can safely use. This will reduce part of the repair and shutdown appearance, improve equipment operation rate.

3.8 to save cooling water, improve sanitation

The choice of rolling bearings in the future, wet grinding and cement mill material can be omitted bearing circulating cooling water equipment, does not affect the bearing life; rolling bearing oil smooth choice in the future, no oil pollution as the appearance of an attack, improved sanitation.

Hunan Jintai Hardware and Machinery Co.,Ltd. is a professional manufacturer on various kind of bearings over 15 years China factory.
We are making all kinds of slide bearings including DU PTFE composit bushing, DX POM composite bushing,bimetal bushing,wrapped bronze bushing, cast sliding bushings and wear plate bearing pad, sintered bronze bushing and sintering parts, ball transfer bearings, etc.
The shapes of bearings can be in sleeve, flanged, spherical, plate, washer, pad, ring, square etc.
Base materials in carbon steel, harden steel, iron, stainless steel, bronze, brass, copper, bronze-steel alloy.Lubricant materials in PTFE, teflon, POM, nylon, plastic, oil, graphite, grease, MoS2, etc.
Export to America,Canada,Brazil,Peru,Argentina,Chile,Paraguay,Europe,Finland,France,Germany,Italy,Spain,Sweden,
Britain,Estonia,Ukraine,Turkey,Austrial,Russia,Korea,Malaysia,Singapore,Thailand,Egypt,Kenya,Somali,
Congo,Zimbabwe,South Africa,etc.