38results about How to "The movement method is clear" patented technology

The invention discloses a three-transverse-movement parallel mechanism. The three-transverse-movement parallel mechanism comprises a fixed support, a movable platform and three branched chains arranged between the fixed support and the movable platform, wherein the branched chains are of the same structure; and each branched chain comprises a rotation fork, a driving arm, two parallel and equal-length driven arms and four T-shaped shafts, wherein each rotation fork is rotationally connected with the fixed support, and each driving arm is rotationally connected into the corresponding rotation fork; and one end of each driven arm is connected with the corresponding driving arm through two corresponding T-shaped shafts, and the other end of each driven arm is connected with the movable platform through two corresponding T-shaped shafts. By means of the parallel mechanism, over-constraining can be effectively eliminated, the structure is simple and compact, and the manufacturing cost is better reduced.

The invention discloses a parallel mechanism with three-dimensional translation and one-dimensional rotation. The parallel mechanism comprises a fixed frame, a moving platform and four branched chains which are symmetrically arranged between the fixed frame and the moving platform and have the same structure. Each branched chain comprises a near frame rod and two far frame rods parallel to each other, wherein one end of the near frame rod is fixedly connected with the drive end fixed on the fixed frame and the other end of the near frame rod is fixedly connected with an upper connection shaft; and one end of each far frame rod is ball-hinged with the upper connection shaft, and the other end of each far frame rod is ball-hinged with a lower connection shaft fixedly connected to the movingplatform. The moving platform comprises a main platform and a secondary platform which are connected by a rotary pair and vertical to each other, wherein both ends of the main platform and the secondary platform are connected with the corresponding lower connection shafts respectively. The parallel mechanism is simple in structure, has definite mode of motion and can meet the requirements of complex holding-releasing operations; and because the drive ends are symmetrically arranged, the rigidity of the mechanism in the whole working space is improved, and simultaneously by replacing the main platform and the secondary platform, or adding a reversing mechanism, the rotational degree of freedom is realized in three orthogonal directions.

The invention discloses a parallel mechanism with two-dimensional translation and two-dimensional rotation. The parallel mechanism comprises a fixed frame, a moving platform and four branched chains which are symmetrically arranged between the fixed frame and the moving platform and provided with a drive device respectively, wherein the four branched chains have two types of structures; the branched chain with one type of structure comprises a straight line guide rail, a drive block arranged in the straight line guide rail and a fixed-length connecting rod of which both ends are provided withrotary hinges; the branched chain with the other type of structure comprises a straight line guide rail, a drive block arranged in the straight line guide rail and a fixed-length connecting rod of which both ends are provided with spherical hinges; the four branched chains with the two types of structures are in crossed arrangement; one end of the fixed-length connecting rod is connected with themoving platform, and the other end of the fixed-length connecting rod is connected with the drive block; and the moving platform is connected with a main platform and a fork-shaped shaft, of which the axial lines are vertical to each other, by a rotary pair, and the main platform can rotate around the axial line of the fork-shaped shaft. The parallel mechanism has the advantages that: the structure is simple; the mode of motion is definite; the requirements on complicated holding-releasing operations are met; and because the connecting rod is the fixed length rod which helps to reduce the inertia load, the parallel mechanism has higher rigidity in different operational ranges, and the high-speed movement is easily realized.

The invention relates to the technical field of automobile parts, in particular to a four-degree-of-freedom parallel mechanism. The four-degree-of-freedom parallel mechanism comprises a fixed frame, a movable platform and four branch chains. The branch chains are symmetrically arranged between the fixed frame and the movable platform and of the same structure. The movable platform is mainly composed of a main platform and a vice platform. The vice platform is connected with the main platform in a sleeving mode through a bevel gear pair. The axis of a big bevel gear of the bevel gear pair and the axis center of the main platform are coaxial, and the big bevel gear is fixed to one side of the vice platform. A small bevel gear of the bevel gear pair is installed on the main platform. The axis of the big bevel gear is perpendicular to the axis of the small bevel gear. An end effector is installed on the lower portion of the small bevel gear. The four-degree-of-freedom parallel mechanism is simple in structure and clear in motion mode. A large rotation angle range is obtained due to the large transmission ratio of the bevel gear pair, so that a magnification mechanism does not need to be used, and the motion speed is greatly increased.

The invention discloses a high-speed parallel robot mechanism capable of realizing SCARA motion. The high-speed parallel robot mechanism comprises fixed brackets, a mobile platform as well as a first support chain, a second support chain, a third support chain and a fourth support chain which are arranged between the mobile platform and the fixed brackets, wherein each of the first support chain and the second support chain comprises a slide plate, a rotating shaft A, two parallel far frame rods with equal length and a rotating shaft B, the slide plate is connected with the fixed brackets through a slide pair, the rotating shaft A is rotationally connected with the slide plate, one end of each far frame rod is in spherical joint with the rotating shaft A, the other end is in spherical joint with the rotating shaft B, and the rotating shaft B is rotationally connected with the mobile platform; and each of the third support chain and the fourth support chain comprises a slide plate and two parallel far frame rods with equal length, the slide plate is connected with the fixed frame through a slide pair, one end of each far frame rod is in spherical joint with the slide plate, and the other end is in spherical joint with the mobile platform. The high-speed parallel robot mechanism is skillful in design, compact in structure and can adapt to complicated gripping and releasing environments.

The invention discloses a vertical rolling bearing equivalent friction coefficient measuring device. The vertical rolling bearing equivalent friction coefficient measuring device comprises a machine body, a sliding table, a mandrel, two bearing pedestals, a rotating speed sensor and a data acquisition / processing / calculation / display device, wherein one of the bearing pedestals is fixedly connectedwith the machine body, and the other one is fixedly connected with the sliding table; an A to-be-tested rolling bearing outer ring is arranged on a bearing pedestal shoulder which is fixedly connectedwith the machine body, and a B to-be-tested rolling bearing outer ring is arranged on a bearing pedestal shoulder which is fixedly connected with the sliding table; an A to-be-tested rolling bearinginner ring is arranged on the shaft shoulder at one end of the mandrel, and a B to-be-tested rolling bearing inner ring is arranged on the shaft shoulder at the other end of the mandrel; the sliding table is capable of horizontally moving along the axial direction of the inner cylindrical surface of the bearing pedestals under the guide of a guide component; and the data acquisition / processing / calculation / display device is used for collecting and processing the angular speed signal, monitored by the rotating speed sensor, of the mandrel, and calculating the equivalent friction torque and equivalent friction coefficient of the tested rolling bearing. The measuring device has the capability of rapidly and precisely measuring the equivalent friction torque and equivalent friction coefficientof the rolling bearing.

The invention discloses a four-freedom-degree high-speed parallel robot mechanism which comprises a fixed frame, a moving platform, a first branched chain, a second branched chain, a third branched chain and a fourth branched chain. The first branched chain, the second branched chain, the third branched chain and the fourth branched chain are arranged between the fixed frame and the moving platform. The first branched chain and the second branched chain each comprise a rotating fork, a close frame bar, two parallel and equilong far frame bars and a rotating shaft, wherein each rotating fork is rotationally connected with the fixed frame, one end of each close frame bar is rotationally connected with the corresponding rotating fork, the other end of each close frame bar is spherically hinged to the corresponding far frame bars, each far frame bar is spherically hinged to the corresponding rotating shaft, and each rotating shaft is rotationally connected with the moving platform. The third branched chain and the fourth branched chain each comprise a close frame bar and two parallel and equilong far frame bars, wherein one end of each close frame bar is rotationally connected with the fixed frame, the other end of each close frame bar is spherically hinged to the corresponding far frame bars, and each far frame bar is spherically hinged to the moving platform. The mechanism is ingenious in design and compact in structure and can adapt to complex grabbing and releasing environments.

The invention discloses a parallel mechanism with a two-degree-of-free translation function. The parallel mechanism comprises a fixed frame, a movable platform, two driving branched chains identical in structure and a driven branched chain, the two driving branched chains are symmetrically arranged between the fixed frame and the movable platform and on two sides of the driven branched chain, the driven branched chain comprises two rod members in left-right parallelism, the upper ends of the rod members are connected with the fixed frame through a rotating pair while the lower ends of the same are connected with the end portion of a horizontal connecting rod, the fixed frame, the two rod members and the horizontal connecting rod form a parallelogram structure, a vertical connecting rod perpendicular to the horizontal connecting rod is fixedly connected below the middle portion of the horizontal connecting rod, and the movable platform comprises a transverse rod and a vertical rod which is vertically fixed above the middle portion of the transverse rod and connected with the vertical connecting rod through a moving pair. The parallel mechanism is low in manufacturing cost, smoother in operating and higher in motion transmitting efficiency.