3 results about "Rotational deformation" patented technology

The invention relates to a corrugated pipe expansion joint large-displacement working condition shear rigidity testing tool and system, and the tool comprises a fixed end, a movable end which is disposed at one side of the fixed end, and is spaced from the fixed end, so as to form a testing space for installing a to-be-tested model machine; the movable end comprises a shearing loading plate and guide grooves, the guide grooves are formed in the two sides of the shearing loading plate, the extending direction of the guide grooves is perpendicular to the axis of the to-be-tested sample machine, and the shearing loading plate is connected with the guide grooves in a sliding mode. Through the constraint effect of the guide groove, the bending moment is borne by the guide groove, it is ensured that the moving end only generates translational displacement, rotation deformation is avoided, meanwhile, the stress level of key components is reduced, and the accuracy and reliability of a test result are improved.

The application discloses a fin effect clamp jaw force-deformation theoretical modeling method based on a co-rotation model, decomposes a fin effect clamp jaw structure into a plurality of beam units, decouples local deformation and rigid body motion of each beam unit through co-rotation theoretical modeling, respectively establishes an axial deformation model and a rotational deformation model, and introduces an effective length correction coefficient to consider the influence of physical hinge connection; a tangent stiffness matrix of the beam unit is constructed and assembled into a global tangent stiffness matrix; a Newton-Raphson iteration method is used to realize force balance solving of a load increment step, and a global force-displacement relationship is constructed; and through adjustment of a global node force vector, various planar load scenarios such as single-point, multi-point and distributed load are adapted. The application breaks through the limitation of small deformation assumption, accurately represents large deformation behavior, improves the calculation efficiency by hundreds of times compared with finite elements, controls the average error within 6%, can quantize the influence of structural parameters such as connection type, beam quantity, beam inclination angle and top angle, and provides a theoretical basis for fin effect clamp jaw engineering design.

The utility model discloses a movable joint for preventing oil pipes from rotating together, which comprises a first sealing element and a second sealing element, a movable nut is movably sleeved on the first sealing element, and the first sealing element, the second sealing element and the movable nut are connected through a locking mechanism. The locking mechanism comprises a semicircular protrusion, a square male head, a semicircular groove and a square counter bore female head. The sealing device has the advantages that the square male head is machined on the first sealing piece, the square counter bore female head is machined on the second sealing piece, the two sealing pieces are inserted together, when the movable nut is screwed, the two sealing pieces cannot rotate or displace and can be better centered, the movable nut cannot drive the sealing pieces to rotate along with the movable nut, and the sealing effect is good. The protruding height of the square male head is smaller than the depth of the groove of the square counter bore female head, the sealing ring is matched, the situation that the sealing face cannot be sealed can be prevented, the structure is simple, manufacturing is convenient, installation and operation are labor-saving, and the risk of distortion, deformation and leakage of the movable joint connecting pipe is greatly reduced.