Cui Guangzhen,Lu Hua,Xiao Yanqiu,et al.Design and Stiffness Analysis of the Partial-face TBM Propulsion Mechanism[J].Journal of Mechanical Transmission,2023,47(02):60-69.
Cui Guangzhen,Lu Hua,Xiao Yanqiu,et al.Design and Stiffness Analysis of the Partial-face TBM Propulsion Mechanism[J].Journal of Mechanical Transmission,2023,47(02):60-69. DOI: 10.16578/j.issn.1004.2539.2023.02.008.
Design and Stiffness Analysis of the Partial-face TBM Propulsion Mechanism
Aiming at the weak stiffness of the series support mechanism of the partial-face boring machine
poor adaptability of the non-circular TBM section
and difficulties in dealing with the blind area of excavation
a partial-face TBM propulsion mechanism based on the 6-SPS parallel mechanism is designed
and a stiffness prediction model establishment method considering the local flexibility of the platform is proposed. Firstly
the geological conditions is selected
the propulsion reaction force is calculated according to the total thrust prediction model
and the propulsion mechanism is designed. On the basis of inverse kinematics; the rectangular coordinate boundary search method is used to calculate the position workspace of the mechanism. Then
by deriving the micro-displacement mapping between branch chain and the platform
the branch chain is considered
the gravity of the moving platform is regarded as an external load
and the finite element software is used to identify the flexibility coefficient at the contact point between the platform and the branch chain; a semi-analytical static stiffness model of the propulsion mechanism is established
which is verified by the finite element software. Finally
the influence of the local flexibility of the platform on the stiffness performance is compared and analyzed
and the results show that the stiffness model considering the local flexibility of the platform is more accurate. This study provides a theoretical basis for the design and development of the partial-face TBM propulsion mechanism.
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