Horizontal vibration type tamping vibration shaft fracture failure analysis and optimization

Horizontal vibration type vibration tamping device 2020 - shaft fracture failure analysis and optimization 06 - 12 Wang Yahu ( Golden eagle heavy engineering machinery co. , LTD. ) Abstract: this paper expounds the working principle of tamping equipment vibration and horizontal vibration type vibration reasons of shaft rupture are analyzed, and the axial vibration of structure optimization and constraints, validated by finite element method to the optimization measures, the actual application results show that the shaft vibration greatly prolong the service life. Key words: vibrating shaft; The finite element analysis; Optimization of 1 foreword horizontal vibration tamping device are introduced American Hasrco Rail technology in the production of a new type of stamping device, after put into use at home, in the job about 100 km or so frequent fracture of the medial axis vibration fault, fault position focused on the bottom of the shaft vibration R4 rounded corners. 2 horizontal vibration type tamping vibration principle of horizontal vibration type tamping vibrator assembly work principle diagram is shown in figure 1. Hydraulic motor with eccentric shaft connected by coupling, 50 hz for pounding picks the oscillation frequency, frequency under this dao picks a positive displacement amplitude of vibration is about 9. 5mm。 3 vibrating shaft fracture cause analysis of horizontal vibration type tamping vibration shaft parts structure as shown in figure 2, the stamping device framework analysis, pounding picks when working under the thrust force and clamping force of reaction route for vibration dao picks dao picks support plate holding pin shaft bearing lubricating oil tank shell stamping framework. Figure 1 horizontal vibration device type tamping vibration principle figure 2 shaft parts structure from the vibration state of shaft fracture analysis, the main reasons are as follows: ( 1) The shaft vibration in R4 rounded by the bearing and the bearing of the upper of the constraints, the shaft vibration R4 rounded corners in the following sections and there is no support between bearing seat, only one oil seal, the R4 fillet position is cantilever structure, and R4 rounded corners is a stress concentration point position. （ 2) Stamping plant next and clamping process, because of the existence of Angle and holding force under vibration shaft by a transverse shear force, under the action of alternating stress in long time or in a harden location under the condition of operation condition is poor, may lead to shaft vibration fatigue fracture. （ 3) Compared with the connecting rod swing type tamping vibration device, the horizontal vibration type dao picks the stamping device inside the dao 2 pick of two back-to-back, in the form of homework dao picks the back-to-back arrangement will 4 dao picks with stone in the middle of the frantic jumble form a closed rectangular ( As shown in figure 3) , so under the pounding picks when pushing a frantic jumble downward movement in the middle of the stone, increased the resistance, and vibration between two adjacent dao picks will be through the clip stone frantic jumble of mutual transfer between the dao picks, make between dao picks received additional additional load. A diagram in figure 3 pick arrangement 4 vibrating shaft fracture treatment by the above analysis and combined with stamping plant actual situation, to improve the stress of the shaft vibration process, from the following two aspects to vibration shaft for processing, as shown in figure 4. （ 1) To improve the vibrating shaft structure, change the rounded corners of R4 to R6, thus improving the rounded place of stress concentration. （ 2) Extended bearing seat, between the housings with dao picks parts ( The cantilever part) Add support bearing, reduce the cantilever length, the clamping force of reaction through the bearing to the stamping device body, make the position of the largest stress to avoid the stress concentration. Figure 4 improved structure diagram 5 finite element analysis. 1 original plan analysis in ANSYS to establish vibration shaft entity model, the dividing method of using adaptive intelligent grid, local human intervention, chassis discrete for 185780 nodes, form a solid entity unit no. 185 15986. Entity model and finite element model is shown in figure 5. Figure 5 axis vibration entity model and finite element model of shaft vibration load of 17 kn radial clamping force and 12. 5 kn axial thrust force downward, according to its structural characteristics in the rolling bearing radial displacement constraints, the two steps limit axial constraints imposed. Figure 6 original vibration axis equivalent stress nephogram analysis results as shown in figure 6, shaft vibration maximum equivalent stress to 53. 6 mpa, is located in the dao picks the transition arc. 5. 2 the improved scheme analysis according to the vibration of the shaft structure and improved installation way to establish finite element model of axial vibration, on the basis of the original constrained bearing level increase dao picks a radial constraints. The new scheme dao 36 picks a stress. 6 mpa, the location of maximum stress is constant, the stress value was reduced by 32% (compared with the original As shown in figure 7) 。 Figure 7 new scheme shaft vibration equivalent stress nephogram 6 improved axial vibration test improvement after stamping device in taian new tasks, ZG4412 and ZG5222 two DCL - 32 x continuous tamping car homework 337 km and 322 km respectively, to improve the vibration of the shaft well, after all did not appear afore-mentioned fracture failure again. 7 conclusion horizontal vibration type tamping vibration device inside shaft fracture of two main factors: one is the shaft vibration R4 rounded bottom lack of constraints, and the shaft as a cantilever structure, in a long time, frequent alternating stress under the action of breaking from the weak; 2 it is pounding picks arrangement has greatly increased the stamping device under resistance, vibration axis force is relatively bad. Based on the above analysis, improvement measures taken by greatly prolong the service life of the shaft vibration; At the same time also suggests that localization of tamping equipment due to significant change, such as using the environment still has a lot of can improve the perfect space. （ Source: in machinery)