As the most reliable bearing manufacturer in China, ZWA has a presence on many production sites throughout the world. We have earned our status thanks to the development of bearings adapted to the requirements imposed by temperature, dust and heavy loads. Our bearings also provide the reliability and durability of the equipment of our end-users.
ZWA will continue to develop highly reliable bearings that will lead to further productivity improvements in the papermaking industry, and it will continue to contribute to the development of the industry.
Current Situatuin of Chinese Paper-making Bearings
The characteristics of modern paper machine are: high speed, wide width, continuous, professional. In recent years, Chinese paper market is booming. But domestic paper machine and imported paper machine, has always been occupied by imported brand bearings, domestic bearings are difficult to shake up the position of imported bearings, from the host supporting to terminal maintenance, almost reached a consensus that “imported bearings must be used”. From pulp to finished paper of the whole production line, it is almost difficult to see the figure of domestic bearings. The annual output and consumption of bearings in China have long been ranked first in the world, but it is difficult to get the first place in some really important industries.
Technical Requirements for Paper-making Bearings
Paper production line requires continuous production, especially professional corrugated paper machine, copper sheet paper machine, culture paper machine and so on is a very huge production line, each roller is often hundreds, a production line used bearings is a large number of models, From the wet end of the forming roller, vacuum roller, drive roller, to press section at the center of the squeezing roller, boots, controllable high roller, roller and cadre’s moving roller, cylinder, guide roller and molding department of sizing, calender roller, paper roller, as well as a multitude of guide roller, the working condition of the function of the roller and alone is varied, the bearing is used in the multifarious, and once the bearing appear problem, It will affect the operation of the whole production line, and even cause abnormal shutdown, with huge loss. Therefore, paper machine bearings have always been the world of imported bearings, because imported brand bearings do have very stable quality and life.
ZWA since it was founded in 2004, has been mainly for export and import brand OEM, therefore, we have very rich experience in quality management, from raw material procurement, testing, manufacturing and product design and quality management has been implemented according to the international first-class standard, and use of processing equipment and testing equipment, also is in accordance with the international standard.
At present, we have dozens of customers in the domestic paper industry, bearings stable use for many years, customers have been praised, in the customer cost savings and shorten the procurement cycle, made outstanding contributions; In terms of stable production, we have successfully replaced many imported brand bearings to escort customers’ equipment. Through our continuous efforts, we have mastered almost all the design and manufacturing process of paper machine bearings, through years of efforts, our quality stability and life, fully reached the level of imported bearings.
We have complete technical guidance and on-site services, including bearing selection, installation, maintenance, failure analysis and other services.
Thrust bearing is a special bearing specially used to bear axial force, that is, the bearing with the force of the vertical direction of the shaft.
Why choose ZWA thrust bearing
We are your most trusted construction partner offering comprehensive services that ensure high-quality bearings within your timeframe and budget.
Failure and avoid methods
Here we list the possible causes and solutions of bearing failure, so that you can quickly solve the problem.
ZWA thrust bearing
Thrust bearings are divided into thrust ball bearings and thrust roller bearings.
Thrust ball bearings include thrust ball bearings and thrust angular contact ball bearings. A raceway ring with a raceway gasket and a ball and a cage assembly is called a raceway ring with a shaft, and a raceway ring with a housing is called a seat ring. Two-way bearings match the center ring with the shaft. Unidirectional bearing can bear unidirectional axial load, and bidirectional bearing can bear bidirectional axial load. The bearing with spherical mounting surface of the seat ring has self-aligning performance, which can reduce the influence of installation error. This kind of bearing is mainly used in automobile steering mechanism, machine tool spindle.
Thrust roller bearings are divided into thrust cylindrical roller bearings, thrust spherical roller bearings, thrust tapered roller bearings, thrust needle roller bearings. Thrust cylindrical roller bearings are mainly used in oil drilling rigs, iron and steel machinery. This kind of thrust spherical roller bearing is mainly used in hydraulic generator, vertical motor, ship propeller shaft, tower crane, extruder and so on. Tapered thrust roller bearing – most commonly used in automotive applications. They can support greater thrust loads than the ball type due to the larger contact area. They are designed to accommodate combined loads, i.e., simultaneously acting radial and axial loads.
Thrust ball bearing – used in low thrust applications where there is little axial load. They are available in two designs: single direction and double direction.
Cylindrical thrust roller bearing – give good carrying capacity.
Tapered thrust roller bearing – most commonly used in automotive applications. They can support greater thrust loads than the ball type due to the larger contact area. They are designed to accommodate combined loads, i.e., simultaneously acting radial and axial loads.
Spherical thrust roller bearing – Spherical roller thrust bearings offer the highest load rating density of all thrust bearings.
Mechanical Equipment In Coal Mine Production Has The Following Characteristics:
The working environment is hostile, the equipment is always surrounded by dust, water vapor and harmful gas;
Working conditions are harsh, most of the mechanical equipment is in high speed, heavy load, vibration, impact, friction and corrosive working conditions;
Long running time, most of the mechanical equipment continuous operation day and night, year-round;
Poor lubrication conditions, due to the harsh environment, harsh working conditions, and short downtime, which makes the mechanical parts can not get good lubrication and maintenance.
Thus,these characteristics cause the staggering economic lost every year, only by choosing the correct bearing, timely regular maintenance, , improve the quality of maintenance, to ensure that all production equipment in a good condition. Mining operators can ensure high productivity and achieve the desired service life of the equipment.
Features of Bearings for Mining Equipment
Cage: Solid brass cage, high strength, good toughness; Special split cage design, more suitable for mining industry.
Inner ring: high precision raceway processed by double raceway cutting mill.
Roller: the roller after processing is sorted for several times to ensure that the size tolerance of the roller in the same bearing is less than 2um.
Outer ring: the outer ring surface has oil holes and grooves; After secondary tempering stabilization treatment, it has higher impact resistance.
Clearance: A special clearance standard for longer service life of bearings on mine equipment.
Degree of coincidence: by controlling the curvature of roller, the degree of coincidence of roller and raceway contact surface is increased from 60% to 80%-90%.
Bearing Common Faults on the Impact of Life
When bearing damage inspection, we can verify the bearing problems and damage factors according to the bearing damage status.
The metal on the raceway surface falls off, and the raceway surface of the bearing and inner and outer rings suffers the advantage of periodic pulsating load, and then produces periodic contact stress. When the number of stress cycles reaches a certain value, the fatigue drop occurs on the working surface of the bearing or inner and outer raceway. If the load of the aligning ball bearing is too large, it will make the fatigue worse. In addition, the bearing installation is not correct, shaft bending, will also produce raceway drop.
Bearing burn, burn bearing raceway, bearing has a backfire color. The factors of burns are improper lubrication, bearing lubricating oil quality meets the requirements or metamorphosis, involving bearing installation is too tight and other problems.
Plastic deformation, bearing raceway and roller contact surface appear uneven pits, self-aligning ball bearing plastic deformation is introduced. The reason is that the local stress of the working surface of the bearing exceeds the compliance limit of the material under the advantage of large static load or impact load. This situation occurs in the bearing with low speed change respectively.
Bearing seat ring crack, bearing seat ring crack factors may be joint bearing too tight, bearing outer ring or inner ring loose, bearing accommodation parts out of shape, installation bearing surface processing effect is not good and other problems. The rapid development of China’s bearing industry, bearing types from less to more, product quality and technical level from low to high, career scale is also from small to large, once formed a complete product category foundation, production layout is more reasonable career production system.
The mining sector, like any other business, has a strong focus on safety and the environment, with an emphasis on productivity, cost control and profitability.
In order to meet these needs of customers, ZWA has been committed to excellent bearing research and development by combining high-quality materials, lubrication and advanced bearing design technology.
After several years of painstaking research, ZWA has achieved “long life and high limit speed” of bearings. For customers in the harsh environment of the mining site greatly improve production efficiency, while reducing maintenance costs.
In the production of food industry, it’s common to separate preliminary products (like cerement, salt, and aginomoto etc) into several grades based on the dimension of particles. Sometimes, in order to proceed next process and improve the product quality, water or other disturbance have to been eliminated, in this case, screening machine will be applied
Due to the variety of processing objects, processing properties and technological conditions in the food industry, the food machinery used must meet the processing requirements of terminal products, and has specific requirements for food product quality, safety and health, nutrition and convenience.
In addition to having the commonness of general mechanical products, bearings used in food machinery also need to meet the market applicability. Bearings used in food machinery need to ensure the safety of the machinery itself, reduce the risk of machinery to a minimum, and ensure the safety of production, industrial health and the safety and health of workers in production.
The rapid development of downstream industry and people’s pursuit of quality of life, inevitably requires enterprises to invest in the corresponding food machinery equipment to meet the needs of production, but also on the food machinery of high precision, intelligent, high-speed level of higher requirements at the same time, but also to meet the personalized needs of enterprises.
ZWA is mainly committed to the design and manufacture reducer bearings and vibrating screen bearings which applied in food machinery . The major accessories of vibrating screen are bearings expect for motors. The quality of bearings will directly affect the function of vibrating screens. After several years of studying and researching , ZWA have made great progress in producing spherical roller bearings for vibrating screen. Now, ZWA have produced spherical roller bearings in vibrating screen in series.
In the application of bearings for the vibrating machines, since the vibrating screen or exciter cause the acceleration of the roller and cages in bearings, extra requirements for designing the bearings will be proposed.In order to meet the high requirements for high accelerating speed and various loads on the dimension, direction and eccentricity.
ZWA researched and developed the spherical roller 223 series based on the same dimension and functions, and produced CCJA and CAFA type spherical roller bearings especially applied in vibrating machines.