Crawler crane planetary reduction confidential system reform

Crawler crane planetary reduction classified 2020 - of the sealing system upgrading 06 - 23 Yu Zongkui ( China metallurgical group co. , LTD. Asset management branch) Abstract: a crawler crane walking speed reducer in the working process of the severe gear oil leakage phenomenon, dismantling found internal gear ring shell around the metal powder and metal debris. Using common rectangular skeleton oil seal instead of the original floating sealing ring seal, solve the problem of the speed reducer gear oil spill. Key words: crane; Planetary reducer; Transform fault phenomenon of a crawler crane company walking speed reducer severe gear oil leakage phenomenon, in the process of working through inspection found that the spill site in reducer shell with the connection part of the driving wheel. Preliminary judgment is reducer and floating seal between the driving wheel system damage caused by oil spill. The secrets of decelerate of planet of sealing parts in gear ring between the shell and the inner sleeve, through a set of floating ring seal. Floating seal ring by two floating ring and two o-ring, o-ring, respectively, and the inner surface of the flange end cover and reducer inner ring form static seal. 2 floating ring under the pre-tightening force of o-ring, close to smooth formation dynamic seal. As shown in figure 1. Floating sealing ring wear or displacement and damage of o-ring, is likely to result in system internal gear oil leakage. Figure 1 deceleration confidential sealing structure 2 dismantling machine of decelerate of planet of the cause of the problem analysis, found the internal gear ring shell around the metal powder and metal pieces, two two-way thrust bearing severe damage, floating seal ring has broken into pieces, sealing parts have been run. As shown in figure 2. Figure 2 ring gear casing metal powder and metal debris analysis thinks, reducer after floating ring is broken for some reason, the pieces of metal stuck in the middle of the bearing rolling into particles, cause bearing roller contact serious wear and tear. Rupture of metal debris stuck in reducer between inner ring and narrow the gap between the flange end cover, machine of decelerate of ceaseless and rolling inner ring shaft neck flange end cover and the inner hole sealing, causing the floating seal ring sealing o-ring surface squeezed injury. 3 repair plan analysis, slow confidential sealing parts serious damage, only replace the floating seal ring can't solve the problem of oil leakage, also need to change speed reducer inner ring and the flange end cover. The speed reducer for some foreign brands one-piece reducer ( With hydraulic motor) Expensive and coordination &liaision instead no guarantee, if the replacement parts, considering decided to the reducer seal system for the transformation. Specific retrofit scheme is as follows. 3. 1 modification seal structure with rectangular skeleton oil seal instead of the original floating sealing ring seal. The original floating seal one group of floating seal ring installation outer gear ring flange on the end cover, we have reprocessed flange end cover, the original floating sealing ring location processing rectangular skeleton oil seal, oil seal an inner hole size according to the skeleton oil seal diameter tight fitting processing. Then reducer inner ring shaft neck seal a cylindrical, according to the rectangular inner hole size fit processing skeleton oil seal, and ensure the surface finish. As shown in figure 3. Figure 3 3 reducer after transforming structure. 2 increase exhaust venting device reducer, when running, make its internal pressure of the internal gear oil games, in order to prevent leak due to stress, also need to add pressure discharge device. Comprehensive consideration, decided to increase on the speed reducer motor connection end a set of pressure discharge device ( See figure 3) , i. e. , the speed reducer upper inner ring axial position processing vent and install breathable cap, to release internal stress reducer. 4 assembly debugging and operation after completion, fix a series of processing to improve reduction unit is installed. Oil seal assembly to avoid the lip is cut, bearing installation of rear axle to the clearance should be controlled in 0 ~ 0. Between 15 mm. Reduction unit after completion of loading, to no-load running, no oil leaking in the confirmation and then put into normal operation. During operation, observe carefully confirm reducer operating normally and no leakage. Using ordinary rectangular skeleton oil seal instead of the original floating ring seal, and can solve the problem of speed reducer gear oil seal, solve the field use, achieve the expected effect, for subsequent similar failure experiences for the renovation of the emergency. Source: engineering machinery and maintenance 2019, 03