Bevel Gearbox Very Broad
The types and applications of metallurgical gearbox are very extensive, mainly through meshing and transmission between gears to accelerate, Bevel Gearbox decelerate, change the direction of transmission, change torque or distribution power to meet the needs of various metallurgical equipment power transmission. Bevel Gearbox Metallurgical gear box is not only used for a variety of mainframe equipment, such as rod wire, profile or plate of rough, finishing and vertical roll, such as the main transmission gear box, but also for a number of auxiliary equipment transmission system, flying shears, coiling machine, punching machine, slitting machines and conveyor raceway. As one of the most critical metallurgical equipment, whether the metallurgical gearbox can operate stably and reliably is related to the normal operation of the whole production line, which will lead to serious consequences if it fails. Metallurgical gearbox is usually in heavy load, impact load, high or low speed, high temperature or high pollution and other harsh operating environment, it is due to the particularity of the working environment and continuous reliable work demand, Bevel Gearbox metallurgical gearbox for the matching bearings put forward more stringent requirements. With high performance bearings, the correct selection of bearings, tolerances, initial clearance and mounting dimensions are prerequisites for ensuring continuous and reliable operation of the gearbox.
Metallurgical gear box bearings are generally adopted with double row roller bearing combination to meet heavy load and high-power power transmission requirements. Roller bearings are tapered roller bearings, cylindrical roller bearings and self-aligning roller bearings. The type of bearings used in metallurgical gear boxes shall be determined by the force conditions of the gear shafts and the characteristics of the various bearings. Double row tapered roller bearings have a good radial and axial composite load capacity, Bevel Gearbox bearing internal clearance can be adjusted, and to enhance the rigidity of the transmission system, therefore, tapered roller bearings are metallurgical gear box design preferred bearing type. However, tapered roller bearings are also deficient, such as high price and do not have self-aligning and eccentric ability, so the metallurgical gearbox is also a large number of other types of bearings, such as self-aligning or cylindrical roller bearings.
Metallurgical gearboxes are often mixed with different types of bearings to achieve optimal design. Compared with the tapered roller bearing, the self-aligning roller bearing has lower cost and can withstand the axial composite load under the specific stress condition. The biggest advantage of self-aligning roller bearings is the ability to adjust the heart, can work under eccentric conditions. When the bearing outer dimension is similar, the double row cylindrical roller bearing can be used to obtain the higher radial bearing capacity, but the bearing can not withstand axial load. Usually, when cylindrical roller bearings are selected for radial and axial composite loading conditions, Bevel Gearbox a thrust bearing or other type of bearing should be used to withstand axial load.
With double row tapered roller bearings, one end of the bearing is usually set to "fixed end", that is, the bearing inside and outside the end of the ring is not left the gap, Bevel Gearbox the axial positioning and bearing the axial load; the other end is a "floating end" to absorb the gear shaft thermal expansion and cumulative tolerances. The "floating end" bearing only bears radial load, the bearing outer ring end face and the bearing seat end cover and the retaining shoulder should reserve enough clearance to cancel the axial displacement of the gear shaft after the heated expansion, the detailed structure is shown in Fig. 1. In order to improve the transmission torque, the meshing mode of helical gears is used extensively in metallurgical gear box. Under heavy load conditions, helical gears are not easy to produce impact vibration noise, stable operation and large load carrying capacity, Bevel Gearbox so helical gears are better than spur gears under heavy-duty transmission conditions.
However, the helical gear engages in an additional axial thrust and acts on the "fixed end" bearing. When the axial thrust is large, it is an ideal solution to choose double row tapered roller bearing as "fixed end" or to add thrust bearing. When the gear shaft has only a single helical gear meshing, and the gear shaft "fixed end" selects the spherical roller bearing, attention should be paid to the ratio between the maximum axial and radial force of the bearing. Self-aligning roller bearing because of its own structural characteristics, when the bearing is subjected to axial force more than its own diameter of 1/3 or 1/4 (according to the specific bearing series), the bearing will appear one side roller force, the other side roller no-load situation. Non-force end rollers in the rotation process can not be guided and positioned in the raceway, the occurrence of roller skew, skid and impact cage, etc., serious may lead to cage fracture, Bevel Gearbox bearing premature failure. Double row tapered roller bearings are guided by pure rolling and roller end face, which can be used for larger axial force and single row roller bearing conditions by controlling the bearing clearance, Bevel Gearbox and the characteristics and differences of the two types of bearings can be seen in Fig. 2. "Fixed end" bearings bearing radial axial composite load, in order to share the shaft endurance and improve the service life, "fixed end" generally placed in the radial force of the smaller side, "floating end" placed in the radial force of the larger end.