Slewing ring soft tape mounting position
Slewing ring device comprises a large variety of slewing ring bearings, slewing raceway and the like. Its role is to support a heavier body around a center of rotation. Raceway slewing ring device generally require heat treatment processing, the usual process is: forging → roughing → quenching → finishing → raceway flame surface hardening → raceway grinding and other processes. Wherein the raceway flame surface hardening will form a flexible tape. The so-called soft zone is an area without heat treatment. Forming a flexible tape heat treatment process is necessary. In the final heat treatment process due to the slewing ring raceway diameter of a circle larger than usually flame surface hardening, which way is the use of acetylene heating needs hardened surface and then adding water cooling, the process is done continuously. Heating flame spray gun and water cannons mounted together, at the same time along the circular piece of circular motion. When the motion to near 360 degrees immediately stop heating and water. That is, water heating and circular area overlapping phenomenon does not occur. If the heating and sprinkler circular region overlapping phenomenon occurs (heat treatment on the circle angle greater than 360 degrees) of the workpiece cracks occur. Tangential width of the region without the heat treatment is typically 15 mm. The 15 mm area in slewing ring is called a soft band. In English often become Soft Zone. Under normal circumstances, the presence of the workpiece on the manufacture of soft steel tape position marked with the words character "S" to illustrate specific soft band position. Regular imported or domestic products usually have this very important marker.
Because of the presence of inevitability flexible tape the rotary support device, which requires a user to use and selection of slewing ring means to be reasonable installation location of its flexible tape in order to improve bearing life. The general principle is to try to be flexible with the installation process of change in the load carrying pressurized with a minimum soft position. Typically ring soft tape rotation device mounted in a vertical position to pitching rotation surface projection line position on the ring of flexible tape reclaimer rotary device to be installed perpendicular to the centerline of the boom cut through the center of rotation, for example, shipment or heap 90 position in the face of the left or right side of the cantilever, which stood on the rotation center. Typically mechanical design soft belt in this position does not exist to support the roll of the rotary support means maximum force status. Under the mounting position of the rotary ring soft tape device to be determined according to the situation and the rotation angle of the center of gravity range of the device. If the angle of rotation is about 100 degrees, the maximum rotation position above the center of gravity in the front part, recommended that the lower ring soft tape installed in the rear, namely 180 degree position. If you change the position of the center of gravity above the rotary part of the position is equal before and after, you can install at any angle position loop soft band.
Location soft with mounting demands from nature will be to improve bearing life, from both users and manufacturers point of view is reasonable location for the upper and lower slewing ring soft tape better. So, as a manufacturer of slewing ring slewing ring should be accurately labeled soft band position as a manufacturer and installer should be reasonably flexible tape slewing ring installation position as required.
