Excavator slewing bearing butter leakage fault interpretation

Excavator slewing bearing butter leakage fault resolution 2020 - 05 - 05 Li Xuan abstract: rotary bearing for hosting excavator unit weight of the upper body and work load, and in the process of excavator work start braking frequently, rotary movement time by 60% ~ 75% of the total cycle time of operation, so the butter lubrication has the important effect of excavator product quality reliability. This paper mainly discusses the excavator slewing bearing butter abnormal leakage fault analytical thinking. Key words: excavator, Slewing bearing. Butter rotary bearing leakage butter is often excavator fault, because of its special assembly location, subject to the loading conditions, such as, the fault at the scene of the engineering maintenance difficulties, has always been a difficulty in excavator enterprises. Although companies have made a different degree of exploration and research, but cannot completely solve the actual encounter all sorts of problems. How the fundamental solution to the problem of rotary bearing leakage butter, has a very broad research space. This article from the following several aspects may be the cause of leakage rotary bearing butter: 1, the structure and principle of the excavator slewing bearing with grease lubrication, the lubrication is divided into two parts, both rotary bearing inner chamber lubrication part, and the internal gear ring and rotary motor pinion lubrication part. Rotary bearing inner chamber located on the outside its seat by the lubricating oil mouth filling grease lubrication. Rotary bearing inner ring and rotary motor pinion by in advance to join grease lubrication. As shown in figure 2. Rotary bearing have both inside and outside two seals. Outside the lower seal fixed on the inner ring cylindrical surface, main effect is dustproof, foreign body into the rotary bearing inner cavity is used to prevent the outside world. Sealed inside the upper located outside a circle round, main effect is to prevent the rotary bearing inner cavity grease overflow. 2, common failure cause analysis ( 1) Uneven grease filling of each brand console manufacturers of excavator in the operating and maintenance instructions, the general rotary bearing grease filling with clear requirements. Including filling cycle and filling method. Such as 250 - 300 h filling time, 90 per rotation & deg; Filling a to grease evenly from outer seal overflow. But customers in the use process, often cannot be carried out in accordance with the requirements listed in the process of market visit we did research, 15 'none of the customers according to the requirements, and even some drivers every day filling grease, causing abnormal leakage. （ 2) Slewing bearing slewing bearing seal structure defect of sealing structure of sealing strip plays an important role, as shown in figure 3, due to the small size 7 by sealing strip and the slewing bearing can not fully fit, easy cause leakage of grease. And the size change of 8, part of the Angle also changes, thus improve the effect of the joint. As shown in figure 4. （ 3) Sealing strip material analysis for specific work environment, slewing bearing sealing strip material's resistance to aging and yellow oily material, such as the rotary bearing abnormal leakage butter play a key role. As shown in figure 5, the two different material of rotary bearing sealing strip your butter tolerance experiment was carried out. After 600 h, sealing strip 1 has hardened inelastic, while no significant difference between before sealing strip with 2 trials. As shown in figure 6. At present domestic rotary bearing sealing performance is good and bad are intermingled, in the case of abnormal leakage of rotary bearing butter, can take a strip from shaw hardness, tensile strength, hardness change, variant, tensile elongation, tensile strength, compression rate of change, volume change, parameters such as density, resistance to butter conditions, low temperature is analyzed, and strip benchmarking performance comparison and guidance to improve. （ 4) Sealing strip putting the rickety fall off in the return accident rotary bearing is analyzed, found a sealing strip falls off phenomenon, as shown in figure 7. To strip off and on the sealing strip as assembly when the paste after tensile ability is not enough. Strict control over the use of glue in homework engineering brands and models, and the control of the sticking points, so as to ensure the stability of tensile ability, prevent the sealing strip off. （ 5) Bad if grease manufacturer or user, use the drop point does not accord with a standard grease, grease easy emulsification dilution, also easy to cause leakage. Therefore, the factory grease into the quality management system, to detect whether the indicators meet the national standards on a regular basis. Users to timely guidance to the market, the use of manufacturer of high quality accessories and products. Author introduction: Li Xuan, male, han ethnic group, in 2004 graduated from shandong university of science and technology, process equipment and control engineering, mountain reconstruction machine co. , LTD. Technology center, engineer. Source: the basic construction of 21, 2015