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小口径地下管道挖掘机是一种在不破坏原有路面和建筑物基础上,可实现自行挖掘并铺设地下管线的新型工程机械。而切削刀盘是地下管道挖掘机的关键部件,因此它的结构形式及强度设计十分重要。针对小口径地下管道挖掘机整体结构尺寸较小,内部空间有限的问题,提出一种分步掘进式内外双刀盘结构,并建立刀盘的三维有限元模型。应用ABAQUS分析软件对刀盘在实际切削条件下的工况进行数值模拟分析,应用ANSYS分析软件对刀盘的强度进行分析,分别得到刀盘推力和扭矩随时间的变化曲线、土体在受到切削时从累积塑性应变直至破坏的变化规律以及刀盘的受力情况。研究表明:采用内外双刀盘结构,切削推力及切削扭矩小,与理论计算大致吻合,刀盘应力小于许用应力。
Small diameter underground pipeline excavator is a new type of construction machinery that can excavate and lay underground pipeline on the basis of not destroying the original pavement and building. The cutter head is a key component of underground pipeline excavators, so its structure and strength design is very important. Aiming at the problem of small overall size and limited internal space of small diameter underground pipeline excavator, a step-by-step internal and external double cutter structure is proposed and a three-dimensional finite element model of cutterhead is established. ABAQUS analysis software was used to simulate the working condition of cutterhead under actual cutting conditions. The strength of cutterhead was analyzed by ANSYS software, and the curves of cutter thrust and torque with time were obtained respectively. From the cumulative plastic strain until the destruction of the law of variation and the force of the cutter head. The research shows that the cutter thrust and cutting torque are small, which are roughly consistent with the theoretical calculation. The cutterhead stress is less than the allowable stress.