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        Sealed Bearings



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        The factors need to be considered for bearing seals
        Bearings are a kind of commonly used mechanical hardware products. Good bearings need to have excellent sealing performance during use. At present, the seals of bearings can be divided into two types: self-contained sealing and external sealing. Generally, the self-contained sealing is relatively simple and the cost is also relatively low; and the ... Bearings are a kind of commonly used mechanical hardware products. Good bearings need to have excellent sealing performance during use. At present, the seals of bearings can be divided into two types: self-contained sealing and external sealing. Generally, the self-contained sealing is relatively simple and the cost is also relatively low; and the external sealing performance device is a sealing device with various properties inside the end cap. Some factors need to be considered in the sealing process to ensure that the sealing performance is better. The factors that need to be considered for bearing external sealing are: 1. Bearing lubricant (grease and lubricating oil); 2. The working environment of the bearing and the size of the occupied space; 3. Advantages of the support structure of the shaft, allowing angular deviation; 4. The circumferential speed of the sealing surface; 5. The working temperature of the bearing; 6. Manufacturing costs. According to the working conditions of the bearing and the requirements of the working environment for sealing degree, we often use various sealing forms in engineering design to achieve a better sealing effect. View Details
        Configuration type of common rolling mill bearings
        (1) Spherical roller bearings. The configuration of the early rolling mill bearings on the rolling mill is different from the present. At that time, two sets of spherical roller bearings were mainly installed side by side on the same roller neck. This configuration basically meets the production conditions at that time, and the rolling speed can r... (1) Spherical roller bearings. The configuration of the early rolling mill bearings on the rolling mill is different from the present. At that time, two sets of spherical roller bearings were mainly installed side by side on the same roller neck. This configuration basically meets the production conditions at that time, and the rolling speed can reach 600 rpm. (2) Four-row cylindrical roller bearing + thrust bearing. The inner diameter of the cylindrical roller bearing is tightly matched with the roll neck, and it can bear radial force. The cylindrical roller bearing has advantages of large load capacity, high limit speed, high precision, easy processing, low production cost, convenient installation and disassembly and the inner and outer rings can be separated. The thrust bearing bears axial force, and the specific structure type can be selected according to the characteristics of the rolling mill. While for heavy-duty low-speed, we can equip with thrust roller bearings to withstand the thrust load with a small axial clearance. When the rolling speed is high, it is equipped with angular contact ball bearings so that speed limit is high and the axial clearance can be controlled. This type of bearing configuration not only has long bearing life, high reliability, but also has many advantages such as high precision and easy control of rolling products. Therefore, it is widely used in wire rod mills, sheet mills, foil mills, and support rolls for cold rolling mills and hot rolling mills. (3). Four-row tapered roller bearings. The tapered roller bearings can withstand both radial and axial forces, and no need to configure thrust bearings. The inner diameter of the tapered roller bearing is loosely matched with the roll neck. It is very convenient to install and disassemble, but sometimes it will cause sliding creep due to the loose fit. Therefore, the inner diameter is often processed with a spiral oil groove. This type of configuration is widely used in the working roll of four-roll hot rolling mill and a cold rolling mill, and roll for blanking machine, steel beam rolling mill. View Details
        Factors affecting the performance of ZYS Spindle
        Heating of spindle is the factor which effects the operation precision of ZYS spindle. The internal heat source of the spindle comes from two aspects: 1. the heating of the spindle bearing; 2. the heating of the motor in the spindle. Solving the motor heating problem needs the cooling motor stator, which can be realized by circulating water cool... Heating of spindle is the factor which effects the operation precision of ZYS spindle. The internal heat source of the spindle comes from two aspects: 1. the heating of the spindle bearing; 2. the heating of the motor in the spindle. Solving the motor heating problem needs the cooling motor stator, which can be realized by circulating water cooling method to take away the heat of the motor; to solve the heating problem of the spindle bearing, it is necessary to take away the heat generated from the operation of the bearing in time. Traditional thin oil lubrication is to transport a large amount of lubricating oil and then achieve invasive lubrication; at the same time, lubricating oil will take the heat away. There are disadvantages of this lubrication way. One is the waste of a large amount of lubricating oil; the other is that the lubricating oil produces a large amount of circulating heat by friction between the molecules of the lubricating oil and the pipeline during the cycle, which causes the oil temperature to rise. The lubricating oil can not only not play a good cooling effect, but also lead to the increase of bearing temperature, which is not conducive to the performance of spindle bearings. Therefore, eliminating the friction heat between molecules in liquid is the key to solve the problem. Practice shows that oil-gas lubrication can fundamentally avoid the occurrence of this situation. First, oil-gas lubrication provides a small amount of lubricating oil to meet the requirements of the bearing. Secondly, oil-gas lubrication does not produce heat from molecular friction of lubricating oil, while clean compressed air takes away the heat produced by bearings and keeps the spindle running at a stable temperature. This can effectively solve the problem of thermal deformation caused by the rise of temperature. View Details
        Daily maintenance of bearings
        Bearings are an important part of machinery. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. Maintenance work is the top priority for bearings to work properly, maintain performance, and extend life. Everyone should take it seriously. Next, let's... Bearings are an important part of machinery. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. Maintenance work is the top priority for bearings to work properly, maintain performance, and extend life. Everyone should take it seriously. Next, let's take a closer look at the daily maintenance work of the bearings. First, keep the bearings lubricated and clean Before inspecting the bearing, clean the surface of the bearing first and then remove the parts around the bearing. Pay special attention to the oil seal, which is a very fragile part. Please be careful when inspecting and disassembling the bearing to avoid damage to the part. If you have been experiencing bad symptoms when inspecting the oil seal of bearing and its surrounding parts, be sure to replace it to avoid damage to the bearing caused by a bad oil seal. Second, to ensure the quality of bearing lubricants The quality of the lubricant has a direct impact on bearing service life. The inspection method for the bearing lubricant is as follows: the lubricant is rubbed between the two fingers, and if there is a contaminant, it can be felt; or a thin layer of lubricant is applied on the back of the hand, and then the sealing is checked. Then it is to replace the lubricant of the bearing. Third, the working environment of the bearing When inspecting bearings, never expose them to contaminants or moisture. If the work is interrupted, cover the machine with a piece of oil-paper plastic or similar material. The working environment of the bearing is also very important. Fourth, the bearing seal The purpose of bearing sealing is to prevent dust, moisture and impurities from entering the bearing, but also to prevent the loss of lubricant. A good seal ensures that the machine works properly, reduces noise and extends the life of the parts. ?The above is the relevant introduction of the daily maintenance work of the bearing. It is mainly explained from four aspects. In fact, these four aspects are also related to each other. Therefore, bearing maintenance work is carried out closely around the four words of clean, lubrication, sealing and environment. View Details
        Installation and maintenance of slewing bearing
        Slewing bearings require careful handling. Slewing bearings should always be transported and stored in horizontal position and be stored in dry roofed areas. Use eyebolts for horizontal handling. Impact, particularly in radial direction, must be avoided. The surface of slewing bearing should be applied with anti-corrosion oil, and the anti... Slewing bearings require careful handling. Slewing bearings should always be transported and stored in horizontal position and be stored in dry roofed areas. Use eyebolts for horizontal handling. Impact, particularly in radial direction, must be avoided. The surface of slewing bearing should be applied with anti-corrosion oil, and the anti-corrosion period is 6 months. Long storage (as backup, for example) periods will require special preservation. Requirements on supporting structures The support in the companion structures must be kept aligned to the track center. In order to prevent local overload and ensure smooth rotation, the supporting structures should be processed to remove internal stress after all the welding procedures. The contact surfaces for the bearing should be machined carefully and should be within flatness tolerances. View Details
        General information about Bearing test machine
        The company has conducted in-depth research on the testing technology and reliability theory of all kinds of bearings, engaging in the development and manufacture of bearing testing equipments and undertaking the simulation testing, life testing and other performance tests for all kinds of bearings. We can also develop and manufacture the fully aut... The company has conducted in-depth research on the testing technology and reliability theory of all kinds of bearings, engaging in the development and manufacture of bearing testing equipments and undertaking the simulation testing, life testing and other performance tests for all kinds of bearings. We can also develop and manufacture the fully automatic control simulation testing machines for the bearings used in various machineries(aviation, spaceflight, railway, automobile, motorcycle, machine tool, motor, etc.) Bearing life test machine Bearing life test results is an important index of comprehensive evaluation of bearing quality. It can reveal the quality level of bearing structure design, manufacturing process, material and lubrication etc. This series of machine is controlled by industrial computer automatically. The load, speed, operation time and other main parameters can be preset, and the machine can work according to the set procedures. The test machine can also monitor, record automatically on bearing load, temperature, vibration, motor speed, current and other parameters. When the testing bearing failure or something wrong with the test machine, the machine will alarm downtime and record down the reason automatically, to realize unattended and intelligent management. Auto bearing testing machine This series of machine are realized the computer automatic control, monitoring test parameters, recording, alarm downtime and other functions. This series of machine test subject design is unique, simulation accurately, high machining accuracy, high components configuration, so as to ensure the stability and reliability of the bearing test. Sealed bearing testing machine This kind of machine are often used to evaluate the bearing performance of a particular level and the durability of the bearing performance, such as the seal, friction, high-speed, high temperature resistance performance. Control mode can be automatic computer control or manual control. Bearing parts testing machine A lot of experiments and data statistics show that when bearing fatigue failure, the most probability is roller failure. Therefore, steel ball contact fatigue testing machine and roller fatigue testing machine are used to test the fatigue life of rolling elements. And then study the internal relationship between rolling element's fatigue life, material, manufacturing process, finished product quality etc. View Details
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