Friday, May 27, 2016

Resistant plastic in 2015 to open 6 new factory in China accounted for half of the global

Resistant plastic in 2015 to open 6 new factory in China accounted for half of the global

According to the k-car network news, France manufacturer resistance to plastic (Plastic Omnium SA) worldwide in 2015 will have six new factories opened, three of which are in China.
Resistant plastic Jean-Michel Szczerba, Chief Operating Officer, said in 2015, the company opened three factories in China, Wuhan bumper factory capacity will supply GM's joint ventures in China, Changsha bumper factory Volkswagen and Fiat's business in China, Beijing factory fuel systems used to supply China's domestic automakers.
Three new factories are located in United States, Tennessee (Tennessee) and Kansas State (Kansas), as well as Russia in Saint Petersburg. Financial report released in February this year, figures showed plastic resistance, in 2014, the company's revenue grew by 4.9% to 4.88 billion euros, net profit rose to 401 million euros 8.6%.
In the company's overall revenues, contributed the 43% share of Western Europe, North America accounted for 26%, Asia's share of only 17%, but it is the fastest-growing areas, last year the company's revenue in China grew by 23% to 430 million euros. Thanks to global demand for innovative lightweight and environmentally friendly products to promote, further expand capacity across the plastics in the world (mainly China and North America) and new product lines, the company plans to 2018, including its smaller, Ministry of the environment, its overall global revenue of 7 billion euros.

In 2016, India rubber imports will grow by 18%

In 2016, India rubber imports will grow by 18%

India Cochin news, India industry officials said recently that the country's natural rubber imports in next fiscal year will increase 18% to 500,000 tons, low price to promote growth in domestic consumption, as well as overseas. India rubber traders Union President George Valy India rubber between meetings, said that domestic and overseas huge price differential will ensure that the increase in imports. Most of the country from Thailand, and Malaysia, Indonesia and Viet Nam buy rubbers.
The current fiscal year ending March 31, imported about 425,000 tons of rubber.
India rubber price of us $ 2.10 per kilogram, Malaysia US $ 1.41, CEAT company, Apollo tyres company (Apollo Tyres), JK tyres and industrial company, MRF companies and tire manufacturers, Balkrishna Industries Ltd increased imports. Rajiv Budhraja, General Manager of the automotive tire manufacturers Association said fiscal 2015/16, India rubber consumption will increase to 1.1 million tons, compared with the current annual growth of 10%, in anticipation of increased demand for tyre industry. Its two-wheel tire usage is expected to be increased $literal%, growth in demand for tyres grow at, 2-4% commercial vehicle growth.
Rubber-tire manufacturers will benefit from the largest consumer groups India auto sales growth because the new Government under the leadership of the country's economic prospects. Budhraja added that rubber prices rose slightly in recent week will help rubber farmers resume tapping, used widely because of low prices before some rubber farmers to delay. Prices are good and the weather improved slightly, output is expected to grow 15%. India natural rubber production next year is likely to exceed 800,000 tons, produced about 700,000 tons this year.

Thursday, April 21, 2016

Plastics machinery industry development trends at home and abroad

(1) From the beginning of the development of plastic products, plastic machinery to provide users from the article, formula, equipment and service and other full-service. (2) in accordance with user requirements, design and manufacture of technology designed for users to solve their difficulties in the application of the device. (3) Reference timely technical development of related industries, will use all the latest scientific and technological achievements to the industry. Scientific and technological achievements such as electronics, telecommunications and automotive industries, aerospace industry. Advances in materials science followed by (4), so that new equipment to adapt to the processing of new raw materials. (5) establish a key factor in the success of the user's device in the market competition is the idea, and strive to equipment operation speed, high efficiency and energy saving. There optimal reorganization case between (6) business, but no large-scale chemical enterprise that jointly. As the foreign professional collaboration very mature, large-scale plastic machinery manufacturing enterprises will not be much. Domestic trends (1) break the existing boundaries of the industry, plastics machinery for various industries stereotypical to develop in depth, and thus it is possible to guide the consumer market transition, but note that the guide must be correctly oriented. (2) When conditions permit, through various means, including joint ventures, cooperation, and continue to learn from foreign advanced products and technology and equipment for the development of our presses, improve the technical level. (3) middle and low domestic market capacity will be squeezed smaller and smaller. Some companies differentiation restructuring, some companies will reduce the proportion of plastics machinery in favor of diversification, some domestic companies will avoid vicious competition and further open up foreign markets. (4) social and professional collaboration will gradually mature. Some manufacturers will focus on the local market will be one big business. (5) individual vision and powerful enterprises started to increase investment in science and technology, accelerate to absorb high-quality management and technical personnel in an attempt to further develop and seek to compete with the world powers.

AC drive applications in the rubber and plastics machinery

1 Introduction
In recent years, China's rubber machinery plastic With the rapid development of national economy, rubber, plastics machinery in the model category, variety series, has been greatly improved the level of automation.
At present, China rubber and plastics machinery manufacturing enterprises of nearly more than 500; 200 large and medium enterprises, the backbone of nearly 10 companies. High-tech, science and technology innovation in products continue to apply, a new drag control are emerging, modern microelectronic technology, digital technology, power electronics technology continues to push new, it has attracted the attention of domestic and foreign counterparts. Especially China's entry into the World trade Organization (WTO) after a lot of international production of rubber and plastic products manufacturers to enter China, some well-known rubber and plastics manufacturers and its supporting power electronics components and manufacturing equipment manufacturers also large quantities to China transfer to China's rubber and plastics machinery manufacturing industry has brought opportunities and challenges.
2 mill stacker device on the machine
of production of open mill has already formed a series of major industrial countries of the world and open mill specifications, size, shape substantially similar. Open mill manufacturing practices: operational measures to increase security, improve working conditions and reduce the area, improve the life of the equipment, the full model range, reduce energy consumption, to meet various user requirements. Under the guidance of the application of the above ideas AC variable speed technology. For example:
stacker asynchronous motor YP112M-4 three-phase voltage 380V power 3kW and put material YP100L-6 three-phase asynchronous motor Voltage 380V Power 1.1kW, respectively Fuji FRN3G11S, FRN1.1G11S AC inverter.
Tabletting machine is the most widely used open mill in an aircraft, it can be supporting the use of the mixer, the mixer refining of Plastic compounds or mix through two rollers strong compression and shear, than mixer mixing chamber at a relatively low temperature (about 85 ℃) shake refining, the processing of rubber plasticity real stability.
After turning the material provided with the transmission, the process may be varied according to the requirements of real-time speed, changing the direction of propagation of the original compound, so as to avoid excessive linear molecular structure of the compound, dispersing various compounding agents tend to make uniform. Due to the shift stacker equipped with the device, effectively compensate for the shortage of rubber mixer for mixing. Won the rubber plasticity stable compound uniformly mixed, so that the pressure of the contraction coefficient product consistency, greatly reducing the compound rate of return, reduce energy consumption, increase efficiency, and more importantly, to improve the products intrinsic quality. 3 extruded rubber sheeting in the film unit cooler film cooling machine and mixer, tableting machines. The mixer refining of plastic compound or rubber, after tableting, film into the machine to soak after coating release agent into the hanging rods, cooled and dried, and finally continuous lamination. This film is a cooling machine Japan, Britain, Taiwan and other manufacturers strengths as a whole, increasing the innovation caught the film robot parts, gear used in Japan Fuji AC drive to achieve grasping film automation, automatic transmission speed synchronization Control System. Since the film is cooled by a machine composed of three models, the full range of tens of meters long, sub-floor and two upper floors are arranged for users of the new engineering processes to achieve rubber mixer production line automation, continuous production, high production efficiency, reduce operating personnel, reduce labor intensity, reduce environmental pollution, has significant advantages. Its motor using YVP112M-4 motors, three-phase AC voltage of 380V, 50Hz; used Fuji FRN4G11S AC drive inverter. 4 120 plastic machinery extruder machine adopts Shanghai Nanyang Electrical Machinery Plant YTSP315 AC asynchronous motors, power is 132kW, the Swedish ABB company ACS550-02,170kVA configure inverter power supply unit, consisting of AC variable speed system, energy saving variable speed operation, high-precision sensor and configured as a speed feedback for high-precision automatic control. 5 Conclusion Throughout rubber and plastics machinery product appearance and internal quality, product designers and manufacturers regard the stability of product quality, reasonable, safety, energy-saving, innovative products as the guiding ideology, is a rubber factory plastics plant to provide excellent equipment. Our rubber and plastic machinery manufacturing in the minicomputer AC variable frequency technology has been applied widely, but relatively few applications on the mainframe AC drive technology. The reason for this is expensive, and bulky equipment and input current decomposable out high harmonics on the grid have some contamination. Situation from rubber and plastics machinery manufacturing applications AC drive our point of view is still in its infancy, from a development perspective AC induction motor applications AC drive technology has a very large market space. With the development of new power electronic devices and high-performance microprocessors and control applications, the drive will become increasingly high performance and low cost, the volume will be smaller, high-performance and multi-functional and will be further pollution of improvement converter frequency Control technology will become more common. According to relevant statistics, the total capacity of the motor using frequency control, only the total installed capacity of electric motor 10, to reach the NDRC motor system energy saving target long way to go.

Melt pressure sensor in the installation and maintenance of plastic machinery

in the Chinese building materials extrusion production line, high-temperature melt pressure sensors to improve melt quality, improve production safety and the protection of production equipment and other aspects play an important role. Meanwhile, melt pressure transducer is very sensitive element, only the appropriate installation and maintenance in order to make the role into full play.   In the extrusion process, the product of some quality standards (such as dimensional accuracy or surface roughness added mineral filler parts, etc.) are required to optimize extrusion pressure control, g melt pressure transducer to achieve this important elements required. By setting the melt pressure sensor and a pressure control device in a mold inlet connection, enabling more stable yields, while reducing material waste. Melt pressure sensors to improve melt quality, improve safety and protect the equipment and extend its service life and other aspects of production plays an important role.   In addition, measurement of pressure through the filter and melt pump to ensure production safety and optimize the performance of equipment is also very important. If the melt into the mold is blocked, the following screen prompts sensor will alert the operator. When the sensor upstream of the filter alarm, indicating that the internal extruder pressure is too high, may cause excessive wear of the screw. For the application of the melt pump manufacturers, the need to measure the inlet pressure and outlet pressure of the melt to ensure that the melt can be continuously flow into the mold, since any impediment may cause damage to a melt pump.   In the extrusion production line assembly melt pressure sensor can be measured only a single point pressure sensor can also be used to measure a series of the entire production line of sensors. Melt pressure sensor and data logger, voice alarm device connected to the use of process control systems can adjust machining parameters of the extruder. At the same time, the pressure sensor is very sensitive element, if not the correct installation and maintenance, it is very easy to damage. Here are a few simple way to help extend the life of the pressure sensor, and can help users get accurate and reliable measurement results.   ● properly installed   damage is usually melt pressure sensors are due to improper mounting position caused. If the sensor is installed in the force is too small pores or irregularly shaped holes, it may cause vibration sensor film impact damage. Select the appropriate tooling mounting holes, help control the size of the mounting holes. In addition, proper installation torque is conducive to the formation of a good seal. However, if the installation torque is too high, it is easy to cause slippage melt pressure sensors, in order to prevent this from happening, usually before the sensor is mounted on the threaded portion of the application of its anti-off compound. After the use of this compound, even with high torque, the sensor is difficult to be moved   ● Check the size of the mounting hole   dimensions of the mounting holes if inappropriate, melt pressure sensor in the installation process, which is very vulnerable to a threaded portion wear. This will not only affect the sealing performance of the device, and the sensor is not functioning well, and may even produce a security risk. Only appropriate mounting holes to be able to avoid wear and tear thread (thread industry standard 1 / 2-20UNF2B), usually using the mounting holes on the mounting holes measuring instrument for testing, in order to make appropriate adjustments.   ● Keep the mounting hole clean   to keep clean and prevent the mounting hole jam melt ensuring the normal operation of the equipment is very important. Before the extruder to be cleaned, all melt pressure sensor from the barrel should be removed to avoid damage. When removing the sensor, the melt may flow into the mounting holes and hardened, if these residual melt is not removed when the installation again melt pressure transducer may cause damage to the top. Cleaning Kit to make these melt residue removal. However, repeat cleaning process is likely to deepen damage mounting holes for melt pressure sensors caused.   If this happens, it should take measures to raise the melt pressure transducer position in the mounting hole.   ● Select the appropriate location   when the melt pressure transducer mounting position too close to the upper reaches of the production line, the molten material may not be worn on top of the sensor; if the melt pressure sensor is mounted too far back in the position in the high-temperature melting may occur between the pressure sensor and the stroke of the screw body stagnation region of the molten material, where the melt may produce degradation, the pressure signal may be transmitted distortion; if the melt pressure transducer too deep barrel, it is possible during the rotation of the screw touch the top of the high-temperature melt pressure sensor and cause damage. Generally, melt pressure transducer may be located on the screen in front of the barrel, before and after the melt pump or mold.   ● Carefully clean   before using a wire brush or special compound extruder barrel cleaning, should all melt pressure sensors are removed. Because the two cleaning methods are likely to cause vibration film melt pressure sensor damage. When the barrel is heated, it should be removed melt pressure sensor and use does not produce wear a soft cloth to wipe the top, while the holes melt pressure sensors also require drills and bushings with clean clean.   ● Keep dry   despite melt pressure transducer circuit design can withstand harsh extrusion processing environment, but most of the high-temperature melt pressure sensor can not be absolutely waterproof, in a wet environment is not conducive to the normal operation. Therefore, the need to ensure that water cooling extruder barrel in the water will not leak, will adversely impact on the sensor. If the sensors have to be exposed to water or moisture in the environment, it is necessary to select a special high-temperature melt pressure sensor has a very strong water repellency.   ● Avoid low interference   in the extrusion process, in terms of raw materials for plastics, from solid to molten state should have plenty of time to soak. If the extruder before the start of production has not yet reached operating temperature, the high-temperature melt pressure sensor and the extruder will be subject to a certain degree of damage. In addition, if the melt pressure sensor from the cold extruder were removed, the material may be adhered to the top of the melt pressure sensor vibration caused by damage to the membrane.

Analysis | Plastic Machinery: poor production increased servo applications

China's plastic products industry is a sunrise industry, light industry in China is the biggest new industry. China's consumption of plastic currently over 60 million tons, accounting for the world's total consumption of 238 million tons of plastic a quarter, more than the United States ranks first in the world. Per capita consumption of 46kg, 40kg more than the world average, and become a true world plastics production, consumption, import and export power. As can be seen from the production of plastics in primary forms and import scale, the production of plastics in primary forms showed a steady upward trend, especially in the last two years, growth momentum is more obvious. And also showed imports rose to a new level, showing China's demand for plastics in primary forms has been a steady upward pattern.
  In 2010, China's production of plastic products and good economic performance, each product output continues to remain higher than the same period last year, a good development trend, but the whole industry output growth rate fell slightly compared with the first three quarters.
  2010 - November domestic plastic products in total output of 51.454 million tons accumulated over the same period in 2009 an increase of 20.9.
  Latest customs statistics show that in November 2010 exports of plastic products 654,276 tons to 1 month to 6,763,415 tons. 14.2 increase compared with the same period last year. With the continuous development of science and technology, China's share of plastic products in the international market will continue to expand.
  Source: National Bureau of Statistics of
  China's plastics machinery has become one of the traditional machinery manufacturing industry the fastest growing industry, the annual demand increase. The rapid development of China's plastics machinery industry due to the following factors: First, the rapid development of the domestic plastic processing industry, strong demand for plastics machinery; the second is the demand for high-tech equipment brought about by the elimination of obsolete equipment upgrades and equipment.
  Statistics can be seen that growth triggered the production of plastic products plastics machinery sales growth. Plastics processing industry good prospects for development, will remain the main driving force of the rapid development of plastic machinery industry. After joining the WTO, to the development of China's plastics machinery industry has brought at least two advantages: First, help exports; the second is conducive to the introduction of technology, including joint ventures and wholly owned foreign businesses to do business brings advanced manufacturing technology.
  According to the China Plastics Machinery Industry Association show that three quarters of 2010, China's plastics machinery manufacturing industry output value reached 30.129 billion yuan, an increase of 72.93, higher than the national machinery industry output value increased over the same period the growth rate (34.59). Moreover, the proportion of imports of plastic machinery two years ago a significant decline. In 2008 China imported equipment in the press market share of over 50, but three quarters of 2010 data, accounted for only 29 or so.
  Benefit from the plastics machinery downstream plastics industry booming, optimistic about the development prospects of our presses. The plastics industry has long been present instead of the traditional household light industry and other general products, high-tech products but with the national strategic emerging industries closely linked. Thus, modern equipment manufacturing, plastics machinery and machine tools industry as a polymer material has been developed manufacturing countries attached great importance to and support. At present, the industry focus on the development of large injection molding machines and other products, high-speed railway, new energy, marine and other industries supporting the development of special equipment.
Servo System in the plastic machinery industry in the application has not yet universal
  following polymer materials wood, cement, plastic products, the fourth largest metal structural material after increasingly by people of all ages, is self-evident, plastics machinery industry ushered in the development of its gold period. After 50 years of development, scientific and technological strength of China's plastics machinery industry, market-oriented, the degree of internationalization has significantly increased manufacturing capacity are constantly strengthened, has become the world's first production of plastic machinery manufacturing country. Even so, the servo system in the plastics machinery industry has not yet spread.
  But with the country's increasing emphasis on energy conservation, as well as a series of policies promulgated by the state support. Rushed the development of plastic machinery industry, will bring the heyday of servo product development. The servo system is mainly used in plastic injection molding machinery and equipment, bag machines, blow molding machines and other devices.
Injection molding machine
  a major role in the servo system is energy-saving injection molding machines, rotary encoders and pressure sensors for flow and pressure, respectively, feedback, high performance servo motors to make the appropriate adjustments by changing the pressure flow speed and torque, and then ensure energy saving, environmental protection and high-response, high accuracy.
  Injection molding process is generally clamping, injection gel, sol, packing, cooling stages, mold, etc., each stage requires different pressure and flow. The traditional pump motor at the highest pressure and power equipment needs to determine, at a constant speed to provide a constant flow rate, the excess hydraulic oil through the relief valve reflux, so a lot of energy and thus wasted. Servo clamping, packing and cooling stage the maximum output pressure, but keep the speed is near zero speed, and thus power consumption is minimized. In the case of injection requires low speed, such as social speed is the maximum speed of 30, about 70 can save energy. Original servo motor capable of high efficiency rare earth permanent magnet synchronous motor, pump motor for the traditional three-phase asynchronous motors. Due to the low three-phase asynchronous motor efficiency and power factor, average conditions in the injection molding machine, the servo motor pump motor efficiency than the traditional 10.
Making machine
  as machinery and equipment for production of bags making machine, positioning accuracy and stability directly affect the quality and production efficiency caused by plastic bags. Replace stepper and other control mechanism by a servo motor, can improve production efficiency and reduce waste production, greatly improving the performance of the machine.
  The basic structure of bag making machine comprising: a body, the upper and lower cutter, variable frequency drive mechanism, upper and lower feed rollers, servo actuator, put the rack, discharge DC motor, can be color standard test frame, removable control box, electric control boxes. The section is responsible for feeding the drive by AC servo system.
  Making machine generally has two sealing and cutting way: Blank Bag decides long seals cuts and seeker sealing, when you select Blank bags decides long seals cuts color photoelectric eye does not work, PLC program based on cutting bag length, mechanical gear ratio, servo drives electronic gear ratio, the servo motor encoder lines and the feed roller perimeter, calculate the number of pulses the servo system required for positioning and driven by the drive servo motor driven feed roller rotation fed a length of plastic bags in order to achieve white bags set long closure cut; when selecting seeker sealing and cutting, the process is as follows, the servo start signal is turned on, the servo motor preset motion curves accelerated motion in accordance with the PLC program, constant speed, deceleration, low-speed chase color, when the PLC received chase when the color signal by interrupting the servo motor way stop immediately.
Blow molding machines
  plastic blow molding machine is the use of extrusion blow molding process to produce hollow plastic containers dedicated, efficient equipment. Currently, plastic blow molding applications increasingly widespread, has become the fastest-growing method of molding a plastic, so that the vast majority of products are hollow plastic extrusion blow molding methods. However, extrusion blow molding highlights the shortcomings of extrusion blow molded products is difficult to control the thickness uniformity. But through the wall thickness of the position control system that can effectively control the thickness and the whole system, so that the wall thickness uniformity is greatly improved.
  Wall thickness control system is a degree of opening of the mandrel gap control system, namely, the position servo system. In the production process of the hollow vessel, in order to ensure the quality of products, require the amount charged can accurately track the set value, but also requires the response process as quickly as possible. A simple 10-point wall thickness controller, for example, in a continuous extrusion mode, the parison die extrusion a minimum time of about 5s, 5s in the time function curve to achieve a limited length, it needs to be is divided into 10 paragraphs, on the time axis, each paragraph only about 0.5s time, according to the tracking theory, the wall thickness controller unit pulse transition time for the passage of time should be 1 / 5-1 / 10, ie 0.05-0.1 s, which requires the system response very quickly. In response so quickly, we must also ensure that the position of the amount charged to accurately track the set value, otherwise, the thickness control would be meaningless. To achieve the control effect of the two requirements for heavy-duty systems, the difficulty is the wall thickness control system design. In addition, since taking l0 points on the parison profile curve to describe the process must be interpolated curve between point and point, try to make a smooth contour curve.
2011 growth will be nearly two plastic machinery
  plastic machinery are the workhorses polymer composites, is a vibrant, promising industry, the development of the plastics industry has a significant leverage effect leveraging a direct impact on various sectors of the national economy development of. All plastic raw materials shall be subject to plastic machinery and mold manufacture to molding is widely used plastic products, therefore, plastics machinery has become the aerospace, defense, petrochemical, marine, electronics, optical communications, building materials, packaging, electrical appliances, automotive and transportation, agriculture, light industry and other sectors of the national economy important technical equipment, and is a strategic emerging industries supporting equipment. Such as carbon fiber used in large aircraft fuselage, artificial heart bypass stents and other products manufactured by modern presses.
  It is noteworthy that, in the case of machinery industry import and export trade surplus remained generally, import and export of plastic machinery trade deficit failed to change in 2010, the trade deficit of nearly $ 900 million. However, the average unit price of import and export facilities by 2009 than 7: 1, reduced to 2010, 5: 1, which indicates that China's plastics machinery to promote industrial restructuring, transformation and upgrading has achieved initial results.
  Projections indicate that in 2011 China Plastics Industry output will reach 1 trillion yuan, an annual growth rate of about 18 plastics industry demand.
  The above is taken from the section from the media market research book "2011 China AC servo market research report"

SKF bearings used in plastics machinery of the five types of bearings

Shanghai Institute Axis Trading Co., Ltd. today mainly to introduce SKF bearings used in plastics machinery bearing the five types of structures and characteristics. 
  First introduced the most widely used of a class: SKF bearings deep groove ball bearings 
  SKF bearings deep groove ball bearings are characterized by: each ring in the structure of deep groove ball bearings have a cross-section about the equatorial circumference of the ball three one-continuous groove type raceway. Deep groove ball bearings are mainly used to bear radial load, but also bear certain axial load. When the bearing radial clearance increases, with the nature of angular contact ball bearing can withstand both directions alternating axial load. Compared with the same size of other types of bearings, such bearings friction coefficient is small, extreme high speed, high precision, user selection of the preferred bearing type. 
  Second, SKF bearings tapered roller thrust structure, the performance characteristics of the bearings: 
  Since thrust tapered roller bearings in rolling element tapered roller in the structure due to the raceway bus rolling bus washer are intersect at the bearing axial line a point, so that the rolling surface can form pure rolling, limit speed higher than the thrust cylindrical roller bearings. Due to less production of thrust tapered roller bearings, the model of the plant has produced more non-standard dimensions, and less standard form factor series, the full production, which is currently no national dimensions of these bearings standard introduction. 
  Third, the structure of SKF bearings Axial angular contact ball bearings, the performance characteristics: 
  Axial angular contact ball bearing contact angle is generally 60 common thrust angular contact ball bearings are generally two-way thrust angular contact ball bearings, mainly used for precision machine tool spindles, general double row cylindrical roller bearings are used together with, it can withstand two-way axial load, with high precision, good rigidity, low temperature, high speed, easy assembly and disassembly. 
  Fourth, double row tapered roller bearing structure, performance characteristics: 
  SKF row tapered roller bearing structure range is the maximum amount of 35,000 type, there is a double outer ring raceway and two inner ring, there is a barrier between the inner ring circle, changing the thickness of the spacer adjustable clearance. Such bearing radial load at the same time can withstand two-way axial load, and can limit the axial displacement of the housing within the bearing axial clearance range. 
  Fifth, SKF bearings tapered roller bearing structural features of: 
  SKF bearings tapered roller bearings are mainly used to bear radial load mainly radial and axial load. Compared with the angular contact ball bearings, bearing capacity, low speed limit. Tapered roller bearings can withstand axial load in one direction, a direction to limit axial displacement of shaft or housing.