Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (4): 1204-1212.doi: 10.13229/j.cnki.jdxbgxb20200372

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Analysis on retracting phenomenon of boom cylinder of loader under unloading condition

Peng TAN(),Xin-hui LIU,Wei CHEN(),Bing-wei CAO,Kuo YANG   

  1. College of Mechanical and Aerospace Engineering，Jilin University，Changchun 130022，China
  • Received:2020-05-27 Online:2021-07-01 Published:2021-07-14
  • Contact: Wei CHEN E-mail:tanpeng19@mails.jlu.edu.cn;Chenwei_1979@jlu.edu.cn

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Abstract:

This paper first analyzes the mechanism of retraction of boom cylinder, and then puts forward a method to solve the problem of boom cylinder retraction by optimizing the force multiplication coefficient of lifting mechanism based on ADAMS. The kinematic ADAMS simulation model of the working mechanism and the AMEsim simulation model of the working hydraulic system are built. Experiments are carried out to verify the correctness of the simulation model. After constructing the objective function and the constraint function, the new hinge point coordinates of the working mechanism are obtained through the optimization of ADAMS. Simulation and optimization results show that, under the premise of satisfying other working performances of the loader, the lifting mechanism force multiplication coefficient in the unloading condition is increased by 30.8%, and the retraction of the boom cylinder is reduced by 89.3%. This research provides a theoretical basis for the design of the future working mechanism.

Key words: wheel loader, retraction phenomenon, force multiplication coefficient, lifting mechanism, simulation and optimization

CLC Number: 

  • TH243

Fig.1

Experiment of boom cylinder retraction"

Fig.2

Pressure curve of boom cylinder without rod chamber"

Fig.3

Cylinder displacement curve"

Fig.4

Stress analysis of unloading condition"

Fig.5

Working cycle process"

Fig.6

Experimental curve"

Fig.7

Simulation curve"

Fig.8

Sensitivity analysis results"

Fig.9

Curve of force multiplication coefficient"

Fig.10

Curve of bucket closing angle"

Fig.11

Curve of unloading height"

Fig.12

Curve of unloading distance"

Fig.13

Curve of rocker arm transmission angle"

Fig.14

Curve of pull rod drive angle"

Table 1

Performance parameter values of working device"

参数初始值优化值
举升机构倍力系数0.130.17
平动性Δα/（°）11.8611.50
卸载角/（°）-44.89-45.09
卸载高度/mm3162.163167.79
卸载距离/mm1049.881080.00
摇臂传动角/（°）57.28~168.9956.69~160.00
拉杆传动角/（°）18.33~159.3216.60~162.47

Table 2

Design variable values before and after optimization"

设计变量初始值优化值
DV_1（Ay）/mm681.00684.50
DV_2（Ay）/mm935.50932.87
DV_4（By）/mm1613.501614.30
DV_7（Dx）/mm1195.001201.29
DV_8（Dy）/mm1558.501561.88
DV_10（Ey）/mm937.74927.61

Fig.15

Working device hydraulic system simulation model"

Fig.16

Simulation pressure curve of boom cylinder without rod chamber"

Fig.17

Simulation cylinder displacement curve"

Fig.18

Optimized pressure curve of boom cylinder without rod chamber"

Fig.19

Optimized cylinder displacement curve"

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