Analysis of Mining Industry Future Development

With the accelerating process of mining, the underground mine is mined much deeper than before , and many open pit mines have begun to enter the underground mining. which means the ore mining will be more and more difficult, the need for large-scale mining equipment requirements are also increasing. And now the country is integrated coal mine planning into a pattern of small place, small-scale mining, the gradual conversion to the pattern of large-scale mines. The mountain climbers Heavy enterprise staff also lamented, mine development rapidly becomes higher requirements for mining machinery and equipment, they have to research more effort to design a better performance, more practicality strong mining machinery and equipment. Only the pace of development of mining equipment, in order to allow a more stable development of the China Mining. The essential equipments of mining are crusher, the mining crusher refers to the crushing machinery whose content is   more than 50% of the total content, the row compound particle size is greater than three millimeters. It is invented by British Hengan. according to the feeding and nesting size, the crushing operations are often divided into coarse crushing, medium crushing and crushing. The commonly used equipments are compound crusher, single stage hammer breaker, vertical crusher, gyratory crusher, roll crusher machines, double roll crusher, combo crusher, and so on.

As we all know, the society now is a "resource" type society, how to find a good exploitation of resources has also become a topic at home and abroad. on the one hand, national ore reserves, on the other hand we need to meet the demand of national mining. With the pace of mining, mineral processing equipment should further follow-up, the ore crushing gravel production line impact breaker, cone crusher created more and more high. The competitiveness of the domestic production of the mine series equipment manufacturers have to make to strengthen the job. Only the better quality of the domestic mining machinery plant equipment, the technology is better guaranteed to win in the competition and foreign manufacturers of mining machinery. Thus prosperity to the country's mining industry, rather than hundreds of millions of dollars of large mining equipment purchased from abroad.
Only under the conditions of the global, national market, and constantly adjust mine "need" and "seeking" to,can we ensure the mines in the country can smoothly and profitability survival . Of course, we hope more mineral products can be exported to foreign countries, the national economic construction will be more prosperity .

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symons cone crusher : http://www.ore-mills.com/cone-crusher.html
impact crusher : http://www.ore-mills.com/impact-crusher.html

Reason of the Impact Crusher Widely Applied

 In the field of ore crushing,the figure of impact breaker are  everywhere. It is normal that people will ask : why the impact breaker  can be applied so widely ? Our company found that, in fact, this is inseparable to the features of impact breaker itself .
The first point , when we use the impact crusher, its materials selection scale is much wider than the other crushing machine, as long as the materials of the particle size is not more than 500 mm ,these kinds of material can be used to be crush. In addition, if it is applied to rough broken , it can even crush the materials whose  diameter is two cubic meters . Impact crusher is such a kind of machine, crushing enterprises can either  use them to  conduct the rough broken, and can also be used for fine crushing, it is undoubtedly save the acquisition costs of machinery equipment.
At the same time, when this impact crusher is used for crushing materials ,  most of the finished products produced are in cubic shape. This kind of product meet the needs of many construction fields, such as highway pavement of high-grade construction, the construction of hydropower facilities are in need of strict construction materials, while the products of impact Crusher just meet this demand.
There is another point makes the  crushing enterprises favorite  impact crusher this kind of device,  that is  its simple structure, easy installation. When crushing enterprise use this Crusher, it is unnecessary to install the complex foundation ,we can simple install them . Even in way, the machine will not appear the phenomenon of vibrating when they work .  In addition, the simple structure principle also makes maintenance or repair operation workers can easily, and ensure the smooth production of company .

The crusher is widely used in mining, metallurgy, building materials, road, railway, water conservancy and chemical industry and many other sectors. Common crushing machines are winnowing mill, hammer crusher, impact crusher, roll crusher, compound crusher. Jaw crusher (jaw crusher), having large crushing ratio, uniform particle size, simple structure, reliable operation, easy maintenance, operating costs and economic characteristics. PF-I series impact crusher can process materials side length is 100 to 500 mm, the compressive strength is up to 350 MPa, great crushing ratio, cubic particles advantages of material was broken; PF-II series impact crusher machine, suitable for crushing hard materials, such as cement crusher, with a production capacity of the material advantages of small particle size.
With these excellent features, the impact crusher  is definitely favored by the impact crusher, and be widely used by the enterprises.
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The Development Future of Grinding machinery Industry

The construction of chinese high-speed railway, the increase demand of clean power demand, the rapidly increased urbanization process, all bring the most indirectly benefits for the crushing machinery industry . From the international market, with the economic recovery after the international financial crisis era, the same broad vision of the machinery industry market. International Mould & Metal & Plastic Industry Suppliers Association, Luo Baihui hint, labor costs, the price of comparative disadvantage are the main elements of the Chinese construction machinery low-end products with strong competitiveness, with the deepening of the economic expansion method change, this competition the disadvantage would be difficult to be continuous. We all know that according to the feeding and nesting size, the crushing operations are often divided into coarse crushing, medium crushing and crushing. The commonly used equipments are impact breaker, compound crusher, single stage hammer crusher, vertical crusher, gyratory crusher, roll crusher machines, double roll crusher, combo crusher, and so on.
It is also for this that the high-end and Raymond manufacturers  integration will become the two main lines of the machinery industry expanded in the future, which is a construction machinery enterprises underappreciated, beyond new opportunity for expanded competition. Currently, a skills revolution brewing a new breakthrough is in the start-up period, a number of key areas, the international division of labor and trade format will emerge deep-grade transfers. Most of China's construction machinery industry in the low end of the international division of labor, will face a major fight. To the domestic high-speed rail, highways and large ports to establish, for example, these areas are proposed for construction machinery high reliability requirements of high-precision, high-end construction machinery course inevitable.
Besides, the other main driving force of modern crushing machinery industry is the integration of all powers of enterpries, Concentrated different enterprise disadvantages . In 2009, the government announced the implementation of the relevant departments hurried into the views of the group of enterprises Chief emphasis will belong mechanical engineering machinery production industry as a country-driven and chief emphasis on group's focus on one of the line jaw breaker price industry. It is also based on the familiarity of the objective environment, many of the construction machinery industry leader planned domestic market at the same time, through mergers and acquisitions of foreign famous construction machinery crusher enterprises and R & D institutions, improve their own resource strength, speed up the international market development.
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Cone crusher : http://www.mine-crusher.com

Detailed Classification of the Home Crusher

Nowdays, the highway, railway, rural roads, construction sand and other industrial buildings are all need the application of crusher machine . Most of the gravel crushers are used for crushing of granite, limestone, marble, blue and white stone, and other hard stone particles, solid particle content of greater than three millimeters total displacement of more than 60% of the solid particles requires a crusher crushed. Domestic manufacturing and production crusher enterprises, but the more famous is our cmpany, the crusher types our company produced are various, and widely used in mining, metallurgy, building materials, road , railway, water conservancy and chemical industry and many other sectors.
If we divide the crusher according of the types, two types are produced- medical crusher and mining crusher. Medical crusher is mainly used for the crushing of the stones of the various organs of the human body, and general physical resonance stones crushing of the human body, it can avoid a lot of the medical risks and medical incidents. Mine crusher for all kinds of stone crushing, according to the principle of broken particles of different sizes and different products, and can be divided into many models in China, commonly used crusher Crusher, is rotary crusher, hammer breaker, compound crusher, hydraulic cone breaker and roll crusher and so on. The crusher is widely used in mining, metallurgy, building materials, road, railway, water conservancy and chemical industry and many other sectors. Common crushing machines are winnowing mill, hammer crusher, impact breaker, roll crusher, compound crusher. Jaw crusher (jaw crusher), having large crushing ratio, uniform particle size, simple structure, reliable operation, easy maintenance, operating costs and economic characteristics. PF-I series impact breaker can process materials side length is 100 to 500 mm, the compressive strength is up to 350 MPa, great crushing ratio, cubic particles advantages of material was broken; PF-II series impact breaker machine, suitable for crushing hard materials, such as cement crusher, with a production capacity of the material advantages of small particle size.

Many Chinese crusher manufacturing and R & D companies adhering to the decades of experience in the manufacturing, research and development, and always adhere to the principle of seeking truth from facts, and efforts to engage in innovative research and development, strict quality control, no recycling recalled mechanical implementation of the international development strategy, and international standards, promote leapfrog development of the enterprise, and to make a contribution to the development of innovation for China's domestic industrial economy.
 
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The Green New Times of Crusher

In recent years, to promote the development of Chinese economy, improve the national income , the government investment to the heavy industry are gradually increase.
Mining machinery crusher has become an important pillar of Chinese national economic development, which has been widely used in industrial construction, and is indispensable to China's industrial equipment. With the continuous development of science and technology, the development of the crusher are constantly in our new discovery in the crusher, injected new innovative technology, has laid a solid crusher better applications in industry foundation.
In environmental protection and energy saving era , our government's investment to the green production and technology research of crushing industry has exceeded the other countries. "Green" is a symbol of vitality, as the main colors of the natural vegetation. "Green" is about preventing the deterioration of the natural environment, improve the environment to make it suitable for a work of human labor and life. "Green" reflects the natural human yearning Chong along the beautiful natural pursuit, and for environmental protection, governance and ultimately to achieve harmony with nature.  Environmental protection is the human conscious conservation of natural resources and make reasonable use to prevent contamination and destruction of the natural environment; comprehensive management of the contamination and destruction of the environment must be prepared( such as the waste produced by the hammer crusher), to create the environment suitable for human life and work. Environmental protection are the various actions taken by humans to solve real or potential environmental problems, and to coordinate the relationship between humans and the environment to ensure sustained economic and social development of the general. The methods and means includes:engineering technology, administration, legal, economic, publicity and education.

Our company has become one of important company whose main work is green production, and main philisophy are to promote the economic growth , and pratice enviroment protect.  Low-carbon environment has now become the main purpose of the development of the industry of crusher, chinese crusher development  has entered the era of green development.

The economic globalization has deeply rooted in our country, the energy saving, low-carbon have become the major trend of the development of various economic undertakings, and this trend has become the the crusher industry development direction. Told the development of China in this day and age, we have to look to see the world, drawing on the experience of other countries. Now some developed countries have developed their technology revolution with the core part of high efficiency, low-carbon.
Chinese government made extraordinary efforts and remarkable achievements in this regard, in this time of global economic develop rapidly, indevelopment innovation, chinese will not miss this green production, at the same time, the green production of crusher will make impressive constribution to it. 
 
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Hammer crusher : http://www.hxjqcrusher.com/crusher/Hammer-crusher.html

How to promote the Innovation Development

 Due to the large mineral resources development and utilization, the available resources continues decrease, the ore mining grade gradually dwindles, as a result, the smelting and subsequent processing of the ore-dressing product quality requirements are increasing. At the same time, human environmental awareness is increasing. These realities put forward more requirements to the mineral processing equipment ,thus promoting the mineral processing equipment to develop toward the direction of bigger, better and efficient energy-saving  .
Although our country has abundant mineral resources, with the rapid socio-economic development, the demand for a variety of mineral resources increased dramatically; the rather low prevalence exploitation of our mineral resources, technical content and low prominent phenomena are widespread . In the global  resources shortage times, the form of extensive management will become increasingly undesirable. The beneficiation equipment (such as the impact breaker)are equipment of mining, refining, beneficiation equipment development of high efficiency is the most important of the mining machinery industry, the good news is, a lot of mining machinery and mining equipment companies have invested a lot of money and effort into beneficiation equipment high the efficiency of innovation and technology, has made ??great development of innovative mineral processing equipment.
Accelerate the beneficiation equipment development in  industry, use the technology to imitate the technology for tracking the technological innovation, technology integration transformation, with the rapid social development, environmental protection, low-carbon energy has gained the production and development, mineral processing equipment industry is also upgrading , improve the product quality, improve production efficiency, reduce equipment energy consumption and environmental pollution should be noted to ensure the achievement of sustainable development. In addition, with the strengthening of the global exploitation of mineral resources, China's exports of mineral processing equipment continued to grow, according to industry data showing a strong momentum of development.
Our company forges ahead in the competitive market, the advanced digital, intelligent automation based mineral processing equipment we researched and developed occupy the commanding heights of industry. Our company gained popularity , now the equipment we produced has become China's large-scale mineral processing equipment, crushing machinery production and export bases. facing the economic demand of low-carbon energy development , our company independent innovated on the equipment design , and finally  developed a variety of mineral processing equipment, they  have already invested in the market and gained highly popularity of the customers,  making great contribution to the sustainable edvelopment for the entire mining machinery industry.

Sand washer supplier : http://www.china-crusher.com/sand-washer3.html
ore beneficiation : http://www.mine-crusher.com/news_115.htm

Work Principle Introduction of the Vibrating Screen

According to the structure and working principle of the screening machinery, it can be roughly divided into the following categories:
(1) Fixed Screen Working part is fixed, the material screening relys on the sliding movement along the working face. Fixed grid screen is a kind of screen that applicated more in the concentrator. Which is used for the coarse crushing or medium crushing in the pre-screening. It is simple in structure, convenient manufacture, does not consume power,we can directly unload the ore to the screening surface. The main disadvantage are the followings : the  productivity is low, the screening efficiency is low , which is generally only 50-60%.
(2) Roller Screen The working face is constituted by the horizontally arranged rolling shaft, there are plates on the rolling shaft ,the fine materials are obtained through the gap between rollers or plates. the bulk materials are driven by the roller to one end and finally discharged from the other end. The concentrator rarely use this sieve.
(3) the cylindrical sieve The working portion is the cylindrical shape. the entire sieve  rotate around the axis of the cylinder, in the general case, the inclination cylinder axis is usually not very large . Fed into the material from one end of the cylinder, the finer level materials adopted by the screening hole of the cylindrical working surface , coarse-grained materials are discharged from the other end of the cylinder. The rotational speed of the cylindrical screen is very low, works smooth, power balance is good. But the sieve is easy to plug, screening efficiency is low, and the work area is small,  productivity is low. The concentrator rarely use it to make the screening equipment.
(4) plane motion sieve The body wobbles or vibrates in-plane . According to their their plane motion trajectory, it is divided into linear motion, circular motion, elliptical motion and complex motion. Shaking screen and vibrating sieve (different from the vibrating grizzly feeder)fall into this category. Shaking screen crank linkage as transmission parts. Motor drives the eccentric shaft rotation  via a belt and pulley , so the body  do the reciprocating movement along a certain direction through the connecting rod . The movement direction  Perpendicular to the strut or suspended rod line ,duo to the the oscillating motion , the materials on the screening face move towards the discharge mouth at a certain speed, at the same time, the materials get screening .
Compared with the above sieves, the shaking screen has the advantages of higher productivity and high screening efficiency . The disadvantage is that the poorly balanced driving force . Concentrator rarely use it nowdays , but replaced by the vibrating sieve whose structure is more reasonable .

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General Knowledge of the Rotary Dryer

What is rotary dryer ?
Let me tell you now, it is a kind of  drying device. The materials in the drying rotating cylinder coaxial  columns sets are dried by the lifting process of spiral blade and intermittent spiral lifting plate exhumation between the inner and outer cylinder   .
The work principle of the rotary dryer:
Rotary dryer adopts the sleeve sets column structure to doubled   shorten the length of the dryer,duo to the radiating surface is significantly reduced, resulting in heat consumption decreased,  so the thermal efficiency is greatly improved by the double increase of the heat exchange surface. As to the materials which can not touch the tobacco materials, multi-drum rotary dryer provided the inner and outer cylinders respectively within the smoke pipe and the annular pipe, the energy-efficient is same. It is not difficult to see that this machine is the most ideal sleeve rotary cooler for the hot feed and cold media.
Rotary dryer features:
1. high degree of mechanization, large production capacity,   continuous operation.
2. Structure is excellent, simple, material running smooth through the barrel resistance, easy operation.
3. Less failure, low maintenance costs, low power consumption.
4 Wide application scale, good dry product uniformity.

Rotating the structure of the dryer
Rotary dryer can be designed based on the user needs, such as the gas furnace, combustion chamber or supporting hoist, belt conveyor, quantitative feeder, cyclone, induced draft fan.
The main parts of the cylinder are as follows: the front roller circle, rear roller rings, gears, gear roll; drag roller, pinion, discharging part, Yang plate, reducer, motor, hot air channel, feed chute, furnace part .
Installation and Commissioning of the dryer:
1, the installation of the dryer should be strictly carried out according to the requirements on the assembly drawing and foundation drawing  , before the installation of the dryer, we should clear all spare parts of the rotary dryer to gurantee the clean and completeness of equipment.
2, since the dryer is a long body large equipment, so the installation should be carried out according to this method:
cross the program baseline, made the right crosshairs on the basis of standard board , level the high line, the center baseline should achieve the standard , including the consideration of not being covered.
 installed the base and the tugboat
Level the horn location, draw the center line of the base, tugboat, in accordance with the requirements of the drawings, identify the location of the installation of the base with the tugboat tone flat positive first foundation hole grouting, when the concrete reaches a certain intensity, tighten the anchor bolts. After the re-inspection,  install the cylinder.

Commonly Problems Analysis of the Dryer

The dryer is mainly used to dry certain humidity or granularity   materials  in mineral processing, building materials, metallurgy, chemical industry and other departments.
The rotary dryer's  materials adaptability is strong, can be used to dry various materials, and the equipment is simple and reliable, so it is widely used.
In the production process, if done incorrectly,   multiple issues will appear, the following are the analysis of the commonly problems of dryer, including the problems reason and solutions.
[1] dryer raw materials fire
Reasons:
1. improper use of the dryer equipment;
2. The dryer equipment is too small to achieve the drying effect,  and force heat to cause a fire;
3 dryer equipment design principle problems;
4 the raw materials suction does not work,  which leads to the dryer in fire.
Solution:
1, consulate with the manufacturer to obtain a copy of the device manual to learn the correct way to use the dryer;
2, replace or retrofit dryer equipment;
3, require manufacturers to replace or retrofit dryer equipment;
4, check whether the dryer equipment is installed correctly ,  leaks , increase the air pressure or not.
[2] raw materials does not dry once time 
Reasons:
1, the dryer is too small;
2 wind net wind pressure, flow calculation error;
3. Dryer's improper use.
Solution:
1, increase the temperature of the dryer, but this method is easy to cause a dryer fire, the best way is to replace or modify the drying equipment.
2, based on the actual situation, ask the dryer manufacturers to provide change programs design  on the basis of re-calculating wind pressure, flow rate   .
3, consulate with the manufacturer of the dryer to obtain equipment manual to learn the correct way for using;
[4] dryer blasting
Reasons:
Dryer temperature is too high, resulting in drying equipment fire;
2, dryer equipment plugged.
Solution:
1, reduce the temperature of the dryer;
2. Clean the dryer equipment.
[5] splitter chimney material
Reasons:
1, the dryer separator is too small;
2, separator design error;
3, dryer air mesh wind pressure calculation error.
Solution:
1, replace or retrofit dryer separator;
2, negotiate with the dryer manufacturers for the settlement design;  
3, consultation with the manufacturers.
[6] materials wet and dry is uneven, system bar of the dryer machine can not work properly.
Reasons:
1, drying equipment used improperly;
2, dryer raw materials get lumps (such as the northern winter raw thawed group).
Solution:
1,  consultation with the manufacturer to obtain equipment manual to learn the correct way for using;
2, crush the lump materials ,and then dry them. 

How to Select the Dryer Heat Carrier

Dryer (dryer) machine is a kind of commonly used drying apparatus whose operation is simple, the process amount is large. the decision of the heat carrier and the choice of its highest temperature depend primarily on its pollution tolerance ,the processed materials properties , and the other factors. The matters we need to note are mainly the following four points:
1, if the dry objects are not allowed to be contaminated, and does not allow air to dilute, the heat should go through the drum wall to enter, at this time, the drum should be loaded in the bricks indoors, the outer should be accessed the flue gas,we can also  set out barrel shelters pipe or tube these surface heat exchanging devices, The heating medium may be flue gas, steam, or electrical heating.  2, if the processing material is not allowed to be contaminated (like the materials be processed in the rotary kiln), and the necessary temperature gas is high, we can use the furnace for the heat carrier, this product is energy saving and environmental protection  ,the heat obey is high, the combustion gas through cleansing disposal penalty can be used again,  the gas stove in energy efficiency is energy-saving 20% than the burner ,and the manual costs are saved much.  Generally, the normal operation of   gas furnace only need one operator, in addition, this machine can use and stop un-continuously, it can does not work  as long as 10 days.3, if the processing solid materials are not afraid of high temperature, and not the non-final products, we allowed the processing materials to be slightly contaminated, the stove or flue gas can be used as the heat carrier, and we can  obtain a high volume rate of evaporation .For example, for drying the materials which contain higher water content , when using the gas inlet temperature of 300 degrees,  the dryer volume the evaporation rate is 5kg/M3/h ,heat obedience to 30% -50%; if the gas inlet temperature is 500 degrees, volume evaporation rate is 35kg/M3/h; thermal obedience is 50% -70%.  4  we can also use the direct heating,that is to say,  the heat is transferred from the metal wall to the dried materials, rather than rely on hot air and material directly contact, such as the external heating tumble dryer.
If the dryer (dryer) does not contain the heat carrier, we can imagin that the dried material contained moisture can not be carried out, the  dried materials can not be quickly dried. And the provision of heat carrier device is not random, we need to  determine it according to the nature of the material itself.

Beneficiation Knowledge about the Ore Grades

Ore grade / ore grade Minerals bit, also known as the ore grade, refers to the degree of enrichment , unit content of useful component metal deposits and non-metallic deposits (such as apatite, sylvite, fluorite, etc.). Which is the main indicator to measure the quality of mineral resources, which is usually expressed in% g / t, g / meters.
　　　
The ore grade determines the  value level,    develop utilization, process  and utilization of direction , production technology process of mineral resources  .According to the content of useful minerals, mineral bits are divided into three categories: (1) Cut-off grade. This is the lowest grade to divide the ore and non-ore boundaries , the materials which have not met this indicator are called as rock or mineralized rock; (2)   average grade. the ore body,   ore block or the entire mining area reaches the total average grade of?industrial  ore reserves  , which has been used to gauge the level of mineral rich and the poor; (3)   industrial-grade, or critical grade.  The minium average ore grade that can be used in industry , that is, in the current economic conditions,   the minimum grade that can be used in the technology research and develop ment.
In general,the high grade ore is bonanza, otherwise known as lean ore. The higher the bit of minerals, the  use value is greater , the production and technical indicators are better; the lower the grade,   the utilization value is smaller,   the production  technical indicators are worse.different mineral resources   grade requirements indicators are not the same. For example,in Chinese regulation, the iron ore industry grade is 20-60% ,  the general requirements of manganese ore manganese content is20-25%, the amount of aluminum bauxite should be more than 40%. , Smelting technology continues to progress with the development of the productive forces (such as the ore beneficiation technology ), and the ore critical grade changes gradually .Such as the early 19th century, people only develop the mine whose copper content is larger than 10% , but today , the mine whose copper content is only 0.5% be exploited .

When carrying out the ore trade, we need to understand the Folk habit way  of various price calculation and specific units .1, gross tons (natural tons): contains the packaging,the direct weighing weight 2  metal tons   : price according to the metal contained in the ores,for example : unit lead ore grade of 100 ton is  45% , after conversing , the metal tons = 100 tons X45% = 45 tons of metal 3.  tons degree: per ton per degree.  4. dry tons: the weight after deducting the moisture. 5 .grams ton:  the  contained grams  number of metal in per ton ore , which is commonly used in the gold, silver and other precious metals.

How to Improve the Quality of Impact Crusher Rotor

Due to the impact crusher (sand making machine) long-term works in harsh conditions, it exacerbate the rotor bearing wear. Without rotor ,the crusher can not work, the rotor is irreplaceable for the crusher.  But it is also fragile,  the  bearing switch is not only expensive, but also   difficult, which often resulted the production halts. How to take effective measures to improve the life of impact crusher rotor bearing is  the largest concern for our customers . We need to pay more attention to the  normal conditions  of impact Crusher (sand making machine) rotor :
 
1)Rightly choice the rotor bearing model . Double row spherical roller bearings have strong bearing capacity, aligning performance these advantages, so this bearings is many peoples'  good choice. In addition, the calculation of the selected bearing life should be 5000 ~ 10000h .
2)  Improve the crusher bearing force status. The role of impact loading on the bearings depends on the impulse acting on the rotor and the bearing support flexibility. Increased bearing support flexibility will reduce the impact load bearing. for this, we can add the appropriate thickness of rubber between the bearing and the support frame board in order to improve the bearing support flexibility. Because of adding the rubber plate, increasing the support softness, thereby absorbing a part of the vibration energy and improve the bearing stress condition, finally  achieved the purpose of prolonging lifetime.
 3) Reasonable adjust the cooperation relationship between each other. The main force impact crusher rotor bears is the impact load, each part of roller cone bears different  load impact   , the roller cone which under the force of unit load impact  bears the largest force, when the inner and outer ring raceway contacts with the rolling body,  the force is the largest. Duo to the non-stop rotation of the inner ring work, the point of contact on the track will recycle from the maximum force to the minium force , therefore the inner ring is required to cooperate tight, so it will not appear the phenomenon of one point staying in the  maximum force point . while the outer ring is different, the outer ring is relatively fixed, the  maximum force  points will stay in a fixed point, therefore, if the outer ring is loose, it is likely to move slightly under the impact load,  thus increase the maximum force points, and extend the life of the outer ring.