Longqin Gao

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In the process of tightening up and screwing off the iron roughneck, it is required that the center of clamping pliers and the center of drill pipe are coincident, so as to avoid the damage of the circular guide in clamping system, and to ensure the iron roughneck work normally. While the traditional method of centering is artificial in iron roughneck, its(More)
The first generation wormlike crawling robot has 8 ropes providing pulling force to change relative position of segments and to accomplish crawling movements. In order to solve problems of rope breaking, force control and length control of ropes appear in trails, the characteristic of pure rolling is studied and kinematics equations are established firstly.(More)
Iron roughneck is a kind of rotating screw device for drill pipes, which is multi-functional, safe and efficient. In the production process, through the automatic control method or remote operations by control platform, it can accomplish the movements, such as rotating screw, thread making, back-off, etc., so it is a very important auxiliary equipment in(More)
The operational principle of bar-type engine oil cooler is introduced in this paper, and the assembly process of bar-type engine oil cooler unit is described. The control system project of the shortest path assembly is presented based on the assembly process. This project adopts PCL-839 control card as the controller to control AC servo motor and step(More)
Since the spot is elliptical when the cylindrical laser irradiates on the spatial plane, the pose of the spatial plane can be described by the elliptical spot. At the same time, the laser spot in the CCD plane is also elliptical. The information of the spatial plane will include in the image ellipse. The monocular vision has been established, and the(More)
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