Double row ball slewing bearing is composed of two rows of ball-shaped rollers, which can bear large axial load, radial load and overturning moment at the same time, with higher safety factor. It is widely used in mechanical equipment such as medium and large cranes, mining equipment and excavators.
Double row ball slewing bearing is called "mechanical joint" in the mechanical industry. It is the original mechanical transmission necessary for the relative rotation between two objects, and can bear axial force, radial force and overturning moment.
The raceway of double row ball slewing bearing is surface induction hardened, and the hardening depth can reach HRC55-62 under quenching and hardening. Because transmission is required, double row ball slewing bearing is usually made of one of the rings. The heat treatment status of the gear is usually normalizing or quenching and tempering. The tooth surface can also be quenched according to the user's requirements, with a quenching hardness of HRC50-60, which can ensure sufficient depth. According to different applications, gear quenching can be divided into full tooth quenching and single tooth induction quenching. Single tooth induction quenching can be divided into tooth surface and tooth root quenching and tooth surface quenching.
Double row ball slewing bearing can work at a temperature of -300℃-700℃. Users need to adapt to double row ball slewing bearings with lower or higher temperatures. Double row ball slewing bearings are used in particularly harsh environments, such as marine climates, dust or abrasive particles, dust, cement, coal, etc. Special seals, protection devices and appropriate oil stains must be used. Therefore, in order to make your bearings work properly, daily maintenance and maintenance should be done.
Double row ball slewing bearing is the same as other common bearings. They have rolling bearings and seat rings, but they are different. Double row ball slewing bearings have many different characteristics. Double row ball slewing bearings are larger in size, sturdy in structure, and especially suitable for tower cranes, car cranes and other loading and unloading machinery with medium and above diameters. Generally, double row ball slewing bearings must not only bear axial force, radial force, but also larger overturning moment, so as to bear various loads. Therefore, a set of double row ball slewing bearings usually plays the role of several sets of ordinary rolling bearings.
Double row ball slewing bearings operate at low speeds, usually 50rpm. In many cases, double row ball slewing bearings cannot work continuously, but can only rotate at a certain angle. There are also significant differences in manufacturing processes such as materials and heat treatment between double row ball slewing bearings and rolling bearings. Generally, double row ball slewing bearings have gear rings for rotating drive and sealing devices for dust prevention. The installation method of double row ball slewing bearings is different. It is not like ordinary main spindle bearings, but is installed in the bearing box and fixed to the upper and lower bearings by screws.
Double row ball-type slewing bearing is also called "slewing bearing" because its shape is similar to a plate, so it can bear the comprehensive load of large bearings. It can also bear larger axial load, radial load and overturning moment. Used in conjunction with ordinary bearings. The use function. It is generally suitable for bearing large overturning moment and relative rotation of mechanical equipment. It is an efficient and high load-bearing combination bearing. Therefore, due to the special properties of double row ball slewing bearings, double row ball slewing bearings have been widely applied.