Boom structure, mechanical engineering and measurement display table

The present invention provides a boom structure, the moment lifting boom structure acquisition method, mechanical engineering and measurement indicator, wherein the boom structure comprising: a base boom; a first arm, a first arm a first end connected by a first pivot arm base; a first link, a first end of the first link is connected by a second pivot arm base, the second pivot axis positioned away from the first pivot side of the first swing arm; a second link, a first end of the second link by a third pivot is connected to the first arm, the third pivot is located substantially away from the side of the first pivot arm, a second end of the second link by a fourth pivot connected to the first end of the first link together; a first drive member, a first driving member includes a first push rod, a first end portion connected to the push rod the fourth pivot. Aspect of the present invention solves the lifting arm when the boom structure of the work in the prior art vary considerably, and thus the problem is difficult to control the lifting moment.