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Slewing bearing

About: Slewing bearing is a research topic. Over the lifetime, 1498 publications have been published within this topic receiving 5309 citations.


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Book ChapterDOI
01 Jan 2015
TL;DR: A denoising method based on multi-scale principal component analysis (MSPCA) and the ensemble empirical mode decomposition (EEMD) is proposed with a new intrinsic mode functions (IMFs) selection strategy, and results show that EEMD- MSPCA is more effective in multi- scale fault frequency extraction of low-speed slewing bearing.
Abstract: In view of the large low-speed slewing bearing, the vibration signals are always very weak and overwhelmed by other strong noise, which makes fault feature extraction from the signals very difficult. In order to solve this problem, a denoising method based on multi-scale principal component analysis (MSPCA) and the ensemble empirical mode decomposition (EEMD) is proposed with a new intrinsic mode functions (IMFs) selection strategy. After that, the vibration signal is reconstructed by the selected IMFs. Finally, a method of multi-scale fault frequency extraction of slewing bearing based on EEMD is applied to denoise the vibration signals. The application of this method is demonstrated with laboratory accelerated slewing bearing life test data. Results show that EEMD-MSPCA is more effective in multi-scale fault frequency extraction of low-speed slewing bearing.

2 citations

Patent
08 Apr 2015
TL;DR: In this article, a central shaft finely-adjusted precise transmission rotary speed reducer is proposed to adjust the meshing gap of a worm wheel and the worm and meanwhile eliminating the axial and radial gaps of the slewing bearing.
Abstract: The utility model relates to a central shaft finely-adjusted precise transmission rotary speed reducer which comprises a base (1). The base (1) comprises a shaft housing (1.1) and a base ring (1.2), wherein a worm (2) is arranged in the shaft housing (1.1), a slewing bearing (3) is arranged in the base ring (1.2) and comprises an inner ring (3.1) and an outer ring (3.2), the inner ring (3.1) comprises a positioning shaft neck (3.1.1) and a bearing shaft neck (3.1.2), the positioning shaft neck (3.1.1) and the bearing shaft neck (3.1.2) are arranged eccentrically, and an upper angular contact bearing and a lower angular contact bearing (4) are arranged between the inner ring (3.1) and the outer ring (3.2). The central shaft finely-adjusted precise transmission rotary speed reducer is compact in structure and capable of accurately adjusting the meshing gap of a worm wheel and the worm and meanwhile eliminating the axial and radial gaps of the slewing bearing. Therefore, the central shaft finely-adjusted precise transmission rotary speed reducer is high in drive accuracy and excellent in waterproof performance.

2 citations

08 Oct 2012
TL;DR: In this article, the pitch surfaces of the bearing were analyzed and examples of the damage caused by the excessive load of rolling elements were presented as well as some suggested actions to limit the occurrence of such damage.
Abstract: Selected slewing bearings and their application have been described in this article. Basic causes of the damage pitch surfaces of slewing bearings have been analysed and examples of the damage have been presented as well. Special attention was paid to these kinds of damage which appeared most often in the case of the pitch surfaces of the bearings and those ones which very often cause premature exchange of the bearing and its scrapping. On the basis of the conducted studies it was stated that the main cause of the damage to the pitch surfaces of the bearings is the excessive load of rolling elements. Based on the results of the conducted analysis, actions limiting the occurrence of the damage to the pitch surfaces of the bearings, which lead to their premature exchange, have been proposed. One of the suggested actions, limiting the premature exchange of bearings, is the necessity of exceptionally thorough design and selection of the slewing bearings, including the conditions of their foundation

2 citations

Patent
20 Apr 2016
TL;DR: In this article, an intelligent asphalt material conveying device consisting of a fixing support, a sliding rail, a moving frame, a hydraulic oil cylinder, a receiving hopper, a slewing bearing I and a screw conveyer I is presented.
Abstract: The invention discloses an intelligent asphalt material conveying device. The intelligent asphalt material conveying device comprises a fixing support, a sliding rail, a moving frame, a hydraulic oil cylinder, a receiving hopper, a slewing bearing I and a screw conveyer I. The moving frame is assembled on the sliding rail, one end of the hydraulic oil cylinder is connected with the sliding rail, the other end of the hydraulic oil cylinder is connected with the moving frame, and the moving frame slides left and right along the sliding rail through telescoping of the hydraulic oil cylinder. The receiving hopper is fixed to the moving frame. The screw conveyer I is located below the receiving hopper and connected with the receiving hopper through the slewing bearing I, and the slewing bearing I drives the screw conveyer I to rotate by 180 degrees. The invention further discloses a pavement maintenance vehicle comprising the intelligent asphalt material conveying device. The screw conveyer I can rotate under drive of the slewing bearing I, an asphalt material can be conveyed and spread in any area within the slewing radius, the material conveying distance is large, the material conveying range is wide, and accuracy and high efficiency are achieved. The device slides left and right through the hydraulic oil cylinder and has multiple states such as a traveling folding sate and a stretching conveying state.

2 citations

Patent
27 Mar 2013
TL;DR: In this paper, a rotary excavating drilling machine and a slewing hydraulic system are described, where the main steering valve and two working oil ports are connected through the first and second oil ways, respectively.
Abstract: The utility model relates to the technical field of piling machinery, and discloses a rotary excavating drilling machine and a slewing hydraulic system of the rotary excavating drilling machine. The slewing hydraulic system comprises a main steering valve, a slewing motor, a first oil way, a second oil way and a third oil way. Two working oil ports of the main steering valve are respectively connected with two working oil ports of the slewing motor through the first oil way and the second oil way. Moreover, when the first oil way is in an oil-inlet condition, the slewing motor drives a slewing bearing to rotate clockwise, and when the second oil pipe is in the oil-inlet condition, the slewing motor drives the slewing bearing to rotate counterclockwise. An oil inlet end of the third oil way is connected with a power head clockwise rotating pressure oil way, and an oil outlet end of the third oil way is connected with the second oil way. The slewing hydraulic system used for the rotary excavating drilling machine improves the braking torque of the slewing bearing, and avoids slew failure. In addition, the slewing hydraulic system can improve the braking capacity of the slewing bearing in any place, and no homemade chassis is needed.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202115
202055
201982
2018124
2017134
2016175