Universal joint of rotary drilling rig

Abstract

The invention provides a universal joint of a rotary drilling rig which is connected between a guide rod and a triangular frame of a parallel connecting rod mechanism and is used for realizing that the guide rod rotates frontwards, rearwards, leftwards and rightwards with respect to the triangular frame. The universal joint comprises a body part which has a hinged hole for being hinged with the triangular frame and realizes front-and-rear rotation of the guide rod with respect to the triangular frame, a universal joint flange which is formed in a manner that the side surface of the body part extends out, is rotatably supported on the guide rod by a pressing plate and is used for realizing left-and-right rotation of the guide rod with respect to the triangular frame, and a guide rod shaft which is connected and supported on the body part, penetrates through the guide rod, is used for supporting the guide rod and can rotate with respect to the guide rod. The universal joint of the rotary drilling rig provided by the invention can disperse the stress of the guide rod and lower the intensity requirement of the guide rod, thereby reducing the weight of the guide rod and decreasing the cost.

Description

technical field [0001] The invention relates to a rotary drilling machine, in particular to a universal joint for movably supporting a guide rod of the rotary drilling machine. Background technique [0002] Rotary drilling rig is a basic machine suitable for digging holes in building foundation engineering. It is widely used in various foundation constructions such as cast-in-situ piles and foundation reinforcement. [0003] figure 1 It is the structural diagram of the existing rotary drilling rig, such as figure 1 As shown, it includes an upper rotating body 101 , a guide rod 102 , and also includes a parallel linkage mechanism 103 , a tripod 104 , a rear pull rod cylinder 105 , and a heave cylinder 106 . Wherein, the lower side of the parallel link mechanism 103 is fixed to the upper rotating body 101, the upper side is fixed to the tripod 104, the tripod 104 is hinged to the guide rod 102, and the tripod 104 is moved up and down by the undulating oil cylinder 106, so th...

AI Technical Summary

Problems solved by technology

In this construct, as in Figure 7 As shown in the stress analysis of the prior art in , the load is concentrated on the installation surface of the universal joint of the guide rod 5, the installation surface not only bears the support force, but also bears the moment load M of out-of-plane bending, so that the guide rod The strength balance of 5 is abnormally disordered. Not only the mounting surface of the guide rod 5 needs to be strengthened, but also the strength of the guide rod 5 itself needs to be greatly strengthened. Therefore, the installation of universal joints on the mounting surface of the guide rod 5 in the prior art has resulted in The force on the guide rod 5 is too concentrated, so that the guide rod 5 must be greatly strengthened, which increases the manufacturing cost

Images