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抓钩集材机的双臂式吊臂是具有二个自由度的多杆机构。图1所示为国产4160抓钩集材机的双臂式吊臂。它由主臂1,主臂油缸2,立臂3和立臂油缸4组成。抓钩5通过摆动油缸装于主臂的自由端。图2所
Two-armed jibs for grappling skidders are multi-bar mechanisms with two degrees of freedom. Figure 1 shows a 4160 grab crane skimmer arm boom. It consists of the main arm 1, the main boom cylinder 2, arm 3 and vertical arm cylinder 4 composition. Grasping hook 5 through the swing cylinder mounted on the free end of the main arm. Figure 2