5results about How to "Improve contact stiffness" patented technology

The application discloses a compression-torsion coupling mechanism and a phononic crystal damping device with adjustable band gap, and belongs to the technical field of phononic crystal damping. The compression-torsion coupling mechanism comprises two plastic elastic plates arranged oppositely, the two plastic elastic plates are connected through a plurality of connecting rods, the connecting rods are connected with the corresponding plastic elastic plates through spherical hinges at two ends, electromagnetic coils are arranged on opposite surfaces of the two plastic elastic plates, the two electromagnetic coils are respectively connected with power supplies, and holes matched with tubular target structures are arranged on the plastic elastic plates. The phononic crystal damping device with adjustable band gap comprises a plurality of sleeves, the plurality of sleeves are used for being regularly and intervalled on the tubular target structure, at least one compression-torsion coupling mechanism is arranged between the two sleeves, the compression-torsion coupling mechanism is convenient to design and manufacture, the installation spacing of the phononic crystal damping unit can be changed through remote and reversible electromagnetic driving, and therefore the effect of adjustable band gap is achieved, and the operation is simple.

The invention relates to a six-degree-of-freedom underactuated parallel variable-stiffness platform which mainly structurally comprises a six-degree-of-freedom industrial robot and a parallel variable-stiffness robot, and the parallel variable-stiffness robot is mainly composed of a lead screw sliding block linear actuator, a variable-stiffness branch chain, a fixed bottom plate, a movable platform and a baffle. Wherein the three lead screw sliding block linear actuators and the three variable stiffness branched chains are core mechanisms. Movement of the six-degree-of-freedom underactuated parallel variable-stiffness platform is achieved through large structural deflection of the flexible connecting rods, and due to passive Cartesian flexibility generated by inherent elasticity of the flexible connecting rods, contact stiffness can be changed, so that contact force is reduced, assembly deviation is treated in time, and the service life of the six-degree-of-freedom underactuated parallel variable-stiffness platform is prolonged. Reliable multi-task assembly tasks of the robot are efficiently completed, a robot controller adopts a rigidity / motion hybrid control method, expected force can be obtained, and expected directional deformation is achieved.

The utility model relates to a noise-reduction motor shell and a motor. The noise-reduction motor shell comprises an end cover, an inner-layer shell and an outer-layer shell, wherein the inner-layer shell and the outer-layer shell are fixedly connected with the end cover; wherein the inner shell is internally provided with an inner cavity, and the inner cavity is used for installing a motor stator and a motor rotor; the outer shell is arranged on the outer side of the inner shell in a sleeving manner; an annular gap is formed between the outer-layer shell and the inner-layer shell, the annular gap is filled with a damping material, and the damping material forms a constraint damping layer with prestress between the inner-layer shell and the outer-layer shell. According to the scheme, the constraint damping layer is arranged between the inner shell and the outer shell, so that the continuity of the overall vibration mode of the shell can be destroyed, the transmission path of vibration waves can be blocked, and when the vibration of the motor stator is transmitted to the inner shell, the vibration waves can be transmitted to the constraint damping layer through the interface of the inner shell and the constraint damping layer; due to the high internal friction characteristic of the damping material, vibration energy is converted into heat energy in the material, energy attenuation is achieved, and structural vibration is effectively reduced.

The invention discloses an axial folding mechanism and a band-gap-adjustable photonic crystal vibration reduction device, and belongs to the technical field of photonic crystal vibration reduction. The axial folding mechanism comprises a plurality of folding plates, a plurality of hinges and a plurality of spherical hinges, wherein the folding plates are connected together through the hinges and the spherical hinges. The plurality of folding plates are assembled in a Mipu paper folding stacking structure, adjacent sides of two adjacent folding plates are connected through hinges, and contact points of three adjacent folding plates are connected through spherical hinges; folding plate electromagnets are arranged on the folding plates located at the two ends of the axial paper folding mechanism, and the two folding plate electromagnets are connected with a power source. The photonic crystal vibration damper with the adjustable band gap comprises a plurality of sleeves, and the sleeves are used for regularly sleeving a tubular target structure at intervals; a plurality of axial folding mechanisms are arranged between the two sleeves in the axial direction of the sleeves. The device is convenient to design and manufacture, the mounting distance of the photonic crystal vibration reduction units can be changed through remote and reversible electromagnetic driving, so that the band gap adjustable effect is achieved, and operation is easy and convenient.

This utility model belongs to the field of locking connection technology, specifically relating to a barbell / dumbbell quick locking device, including an inner cylinder with an axial through hole and an outer sleeve sleeved outside the inner cylinder. The outer wall of the inner cylinder has a first conical surface, and the inner wall of the outer sleeve is provided with a second conical surface matching the first conical surface. An inclined surface is provided on the outer wall of the inner cylinder on the larger diameter side of the first conical surface. An unlocking button for driving the inclined surface to move axially is provided on the top transverse groove of the outer sleeve. Steel balls are fitted in the first through holes circumferentially spaced on the first conical surface of the inner cylinder. An annular cover plate is connected to the end face of the outer sleeve on the groove side. A spring for driving the inner cylinder to move away from the cover plate is provided between the cover plate and the inner cylinder. The advantages are: simple structure, convenient use, stable performance, reliable locking, and suitable for locking and positioning components on shafts or pipes.