Analysis Of Local Stress At The Slide Of Crane Box Telescopic Arm

As an indispensable material lifting and handling machinery,truck cranes have played a huge role in engineering practice.Among them,the telescopic boom crane has been greatly affected by its outstanding performance due to its small space occupation,large working distance and high working height.welcome.And as the lifting weight and working height continue to increase,higher requirements are placed on the strength,stiffness and stability of the telescopic boom.As the key component of the crane,the telescopic boom slider plays the role of guiding and transmitting loads.The forces in the sliding contact area are very complicated,which easily causes stress concentration,which affects the local stability of the telescopic boom.Therefore,it is necessary to study the influence of the parameter change and distribution position of the telescopic boom slider on the local stability of the crane.It is of great significance to further improve the bearing capacity and local stability of the boom.This article compares and summarizes the current research on the local stability of the telescopic boom at home and abroad.Starting from the contact non-linearity of the telescopic boom and the slider,(1)introduces the structural characteristics of the box-type telescopic boom,the section form,and summarizes the research on elastic contact.Method;(2)ANSYS software was used to establish a finite element model of rectangular cross section,U-shaped cross section,and elliptical cross section of the box-type telescopic boom and slider,and appropriate contact parameters were set;(3)The ANSYS contact nonlinear analysis method was used to study the influence of rectangular,U-shaped,and oval cross-sections on the maximum stress of the telescopic boom,the maximum stress of the slider and the maximum displacement of the boom under the conditions of 45 ° and 78.18 °.(4)Adjust the slider length and support position of the elliptical section telescopic boom,and summarize its influence on the maximum stress change of the elliptical telescopic boom,the maximum stress of the slider and the maximum displacement of the boom under the conditions of 45 ° and 78.18 °.The conclusion is as follows:(1)Compared with the three cross-section forms,the stress distribution of the telescopic boom with an oval cross section is more uniform,the telescopic boom with a U-shaped cross section is second,and the stress distribution on the telescopic boom with a rectangular cross section and the slider is more concentrated,which is not conducive to the stability of the boom;The maximum stress of the slider of the elliptical section telescopic arm and the U-shaped section telescopic arm are relatively close.(2)Changes in the telescopic boom section form,slider length,and slider support position have a more significant effect on the local stability of the telescopic boom at 45 °than at 78.18°.(3)The optimal length of the telescopic arm slider with elliptical cross section is 304 mm,and the optimal support position of the telescopic arm slider is 17 ° between the two sliders.(4)The change of the slider length has a greater effect on the maximum displacement of the telescopic arm,and the change in the support position of the slider has a greater effect on the maximum stress of the elliptical telescopic arm and the maximum stress of the slider,and has a smaller effect on the maximum displacement of the arm head.