According to the annual report of the National Bureau of Statistics, in 2004, the number of state-owned and state-controlled enterprises in the bearing industry in the country and non-public enterprises with annual sales of more than 5 million yuan have reached 927. In 2003, the industry-wide bearing production was 4.1 billion sets, bearing sales revenue was 39.2 billion yuan, Bearing sales in China has leapt to No. 4 in the world, a world bearing manufacturing power. In particular, miniature, small deep groove ball bearings have become the world's largest production capacity of the country. Deep groove ball bearings as a subclass of bearings, because of its wide range of applications, long service life, is widely used in modern equipment manufacturing industry, processing equipment and equipment to improve the accuracy and quality has been greatly improved, it can be said deep groove ball bearings In the future the device will be a large number of applications, its market prospect will be more extensive. The widespread use of deep groove ball bearings thanks to the common understanding of the majority of equipment workers, with its excellent performance is accepted by everyone. Deep groove ball bearings generally consists of a pair of ferrules with a cage, a set of rigid balls and a cage structure, deep groove ball bearing type code 6. Is the most common production, the most widely used type of bearing deep Groove ball bearing has the advantages of simple structure and convenient use, and is the largest in production batch with a certain axial load. When the radial clearance of the bearing is enlarged, it has the function of angular contact ball bearing and can bear larger axial load. Deep groove ball bearings are mainly used to bear pure radial load, but also can withstand both radial and axial load, when it is only subjected to pure radial load, the contact angle is zero. Deep groove ball bearings with large radial clearance, angular contact with the performance of the bearings can withstand greater axial load. Deep groove ball bearings friction coefficient is small, the speed limit is also very high, especially in the Axial load is high under high-speed operating conditions, deep groove ball bearings than thrust ball bearings more advantages compared with other types of bearings of the same size, the friction coefficient of such bearings is small, high speed limit at high speed should not Thrust ball bearings can be used in the case of such bearings to withstand axial load.Shared deep groove ball bearings installed on the shaft, the axial displacement of the shaft or housing can be limited to the bearing axial clearance within the same time, when the shell When the hole and the shaft (or the outer ring to the inner ring) are tilted relative to each other (no more than 8-16 depending on the play), the bearing can still work normally. However, if there is a tilt, it is inevitable to reduce the service life of the bearing. Deep groove ball bearings and other types of bearings of the same size compared to the smallest friction loss, high speed limit, the higher speed should not be used thrust ball bearings, these bearings can be subjected to pure axial load .If the increase in its manufacturing Accuracy, and the use of bakelite, bronze, aluminum and other materials solid cage, the speed can be increased. The characteristics of deep groove ball bearings Deep groove ball bearings with simple structure, compared with other types of easy to achieve high manufacturing precision, so easy to series mass production, manufacturing costs are lower, the use of very common. When the larger radial clearance is selected, the axial bearing capacity increases and the contact angle is zero when subjected to pure radial force. The contact angle is greater than zero when there is axial force. Generally used stamping cage, car body cage, and sometimes also used nylon frame. In addition to the basic type of deep groove ball bearings, there are a variety of variants, such as: with a deep groove ball bearing dust cover; with rubber Deep groove ball bearings with sealing groove, deep groove ball bearings with retaining groove, deep groove ball bearings with large load capacity with ball gap, double row deep groove ball bearings, but they all share the following common features: Structurally, each ring of a deep groove ball bearing has a continuous groove raceway approximately one-third the cross-sectional circumference of the ball. It is mainly used for radial and axial loads. 2, the bearing radial clearance increases, with the nature of angular contact ball bearings can withstand axial load alternating two directions; 3, small friction, high speed; 4, simple structure, low manufacturing costs, Easy to reach higher manufacturing precision; 5, the general use of stamping cage, diameter greater than 200mm or high-speed operation of the bearing, the car entity cage. Deep groove ball bearings installation and application of maintenance Deep groove ball bearings are the most representative of the rolling bearing, a wide range of uses. Suitable for high speed or even very high speed operation, and very durable, low maintenance costs, long operating cycle.But require professional and technical personnel regular inspection and maintenance, in order to ensure the operation of the safety, reliability, and improve the operation cycle and quality.One, Deep groove ball bearings assembly Deep groove ball bearing assembly requirements of assembly personnel have higher professional skills in the assembly process strictly enforce the technical requirements and operating procedures bearing installation is good or bad, will affect the bearing accuracy, life expectancy And performance Therefore, please fully consider the installation of bearings, bearings should be installed in accordance with the following operating standards. 1 Clean the bearings and related parts (grease-lubricated bearings and double-side oil seal or dust cover, seal ring bearings before installation without cleaning). 2 Check the size of the relevant parts and finishing conditions. 3 Installation method Bearing installation should be based on the bearing structure, size and bearing components with the nature of the fit, the pressure should be added directly to the tight fit of the ferrule end face, not through the rolling body to transmit pressure. Bearing installation generally use the following method: Press fit: bearing inner ring and the shaft so tight fit, the outer ring and the bearing seat hole is loose fit, the press can be used to press the first bearing mounted on the shaft, and then the shaft together with the bearing Into the bearing seat hole, when pressed in the bearing inner ring end surface, the pad made of a soft metal material to do the mounting sleeve (copper or mild steel), bearing outer ring and bearing seat tight fit, the inner ring and the shaft is more Loose fit, the bearing can be pressed into the bearing housing hole, then the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole .If the bearing ring and the shaft and seat hole are tight fit, the installation of indoor and outdoor The ring should be pressed into the shaft and seat hole at the same time, the structure of the assembly sleeve should be able to simultaneously hold the end face of the bearing inner ring and outer ring. Heating fit: through the heating bearing or bearing seat, the use of thermal expansion will change the tight fit into a loose fit installation Method is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference, the bearing or separable bearing ferrule into the fuel tank before heating evenly heating 80-100 ℃, Remove from the oil and attach to the shaft as soon as possible , In order to prevent cooling after the inner ring face and shoulders fit not tight, the bearing can be further cooled after axial fastening bearing outer ring and light metal bearing with a tight fit, the use of heated bearing hot-mounting method, Avoid scratching the mating surface. When heating the bearing with fuel tank, there should be a grid at a certain distance from the bottom of the tank, or the bearing should be hung with a hook, the bearings can not be placed on the bottom of the tank, so as to prevent impurities from entering the bearing or uneven heating. The tank must have a thermometer, Strict control of the oil temperature shall not exceed 100 ℃, to prevent the tempering effect, reducing the hardness of the ferrule. Bearing installation method, under normal circumstances is the majority of shaft rotation, so with the inner ring and the shaft for over-win with the bearing outer ring and the bearing chamber with the clearance fit. Bearing operation Check the bearing installation should be carried out immediately Operation check, has determined the installation is normal .In two, the deep groove ball bearing operation and maintenance Reliable maintenance work is to ensure that the bearing long-cycle operation of the main means of equipment for a period of time should be timely and professional and technical personnel to inspect and maintain the equipment, Mainly in the following areas: 1 Check the bearing operating temperature, below 65 degrees. 2 Check the amount of axial movement of running parts. The main bearing clearance is not meet the requirements. , Corrosion, pits, cracks, etc. 4 lubricating oil or grease lubrication, to be promptly replaced or added, but not too much, requiring one third to one half of the lubricating oil, grease one third Third, the case analysis of urea deep hydrolysis device as fertilizer industry wastewater treatment terminal device, the core equipment hydrolysis pump for multi-level, high Speed, high-temperature, high-pressure equipment. Over the years running unstable, so that the production of urea be greatly affected. Mainly in the bearing short life cycle, machine vibration and other failures .After everyone's analysis that its
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