用于贮木场及板院装卸归楞和短途运输木材的正面和侧面叉车的门架机构具有长行程的起升油缸,结构如同细长柱体,其类型分成柱塞式和活塞式。前者造价高、维修复杂,但截面惯量大,工作时不易失稳;后者价靡,装配维修方便。但截面惯量小,尤其当偏载起动时,更需校验发生挠曲变形时的油缸整体稳定性。兹参考试验实测工况,结合理论分析进行验算。 Mast mechanisms for storage yards and boards Frontal and side-lift trucks for loading and unloading haul and short-haul timber Long-stroke lifting cylinders, structured like slender cylinders, are of the plunger and piston type. The former cost is high, the maintenance is complicated, but the cross-section inertia is large, and the work is not easy to lose stability; the latter is expensive, and the assembly and maintenance are convenient. However, the inertia of the section is small, especially when the partial load is started, it is more necessary to check the overall stability of the cylinder when the deflection occurs. Reference to the experimental test conditions, combined with theoretical analysis of checking.