59results about How to "Reduce turning force" patented technology

The invention relates to an electromagnetic drive device, comprising a drive part (10), which has a circular or oval cross-section, can move in a to-and-fro manner in the stroke direction (H), and which has a permanent magnet arrangement that is magnetized transversal to the stroke direction (H). Said permanent magnet arrangement has at least one pair of oppositely magnetized magnet parts (11-14)that are placed one behind the other in the stroke direction, and is situated in the interspace of a yoke arrangement (16) having pole pieces (19-22) that, in the magnetizing direction, are provided on opposite sides of the drive part (10). The yoke arrangement (16) has two pairs of pole pieces (19, 21 and 20, 22), which delimit the interspace and which are connected to one another via two yoke areas (23, 24) extending essentially parallel to the stroke direction (H). At least one of the yoke areas (23, 24) is surrounded by a coil (25, 26) that can be flown through in order to effect a stroke. A pair of oppositely magnetized magnet parts (11, 12 and 13, 14) of the permanent magnet arrangement is assigned to each pair of pole pieces (19, 21 and 20, 22). This makes it possible to easily obtain a very slim design.

A passive joint device, a cable guide, and a power transmission mechanism are provided. The passive joint device supports a rotation-side member so as to be rotatable in the vertical direction with respect to a fixed-side member about a horizontal axis, and is provided with: a cylindrical cam member, which is fixed to the fixed-side member, has a cylindrical surface about the horizontal axis, and has a pair of cam surfaces symmetrically arranged on the cylindrical surface by taking the horizontal axis as the center and obliquely formed along the horizontal axis; a pedestal having a pair of cam followers disposed inside a horizontal shaft fixed to the rotation-side member so as to be capable of sliding along the horizontal shaft, the cam followers being in surface contact with the pair of cams; and a spring which is disposed inside a horizontal shaft fixed to the rotation-side member and which biases the pedestal toward the fixed-side member along the horizontal shaft, wherein the pair of cam followers is brought into contact with the pair of cam surfaces by the force of the spring, and the pair of cam surfaces are pressed to apply an upward rotational force to the rotation-side member so as to reduce a downward rotational force of the rotation-side member generated by the weight applied to the rotation-side member.

The invention discloses a manual multifunctional wire tightening device and a wire tightening method. The device comprises a rack, a rope winding drum, a gear transmission and a pulley block. According to the manual multifunctional wire tightening device and the wire tightening method which are disclosed by the invention, the speed is changed by a gear and the pulley block and the tractive force is reduced, so that the hand-cranking and manual rotating force is greatly reduced and the weight of a machine body is only about 30kg and is flexible to construct and carry. The traction operation can be carried out by a single person in a hand-cranking and manual mode at the position far away from a strain power pole or a hoisting device by over ten meters; and the manual multifunctional wire tightening device is different from the heavy weight of a conventional maneuvering winching machine and the time wasting and labor wasting of a mode of manually winching and circling by a plurality of people. The manual multifunctional wire tightening device and the wire tightening method are particularly suitable for the field erection construction of various specifications and types of wires.

The invention relates to a runner-type piezoelectric beam energy harvester with a suspended shaft end, and belongs to the field of piezoelectric power generation. A left end cover and a right end cover are arranged at the left side and the right side of a runner respectively; metal substrates provided with cantilever beams are crimped between the left end cover and the side wall of the runner and the right end cover and the side wall of the runner respectively; each metal cantilever beam and an adhered piezoelectric crystal plate form a piezoelectric vibrator; an excited magnet is arranged at a free end of each piezoelectric vibrator, is arranged close to the runner and is arranged in a rectangular guide groove in the side surface of the runner; a cantilever shaft of a gear is arranged in a center hole of the runner and the end part is connected with the right end cover; the cantilever shaft and a ring cavity in the runner form a slideway; a cylindrical exciter made of a non-ferromagnetic material is arranged in the slideway; and exciting magnets are inlaid into two ends of the exciter. The runner-type piezoelectric beam energy harvester with the suspended shaft end has the features and advantages that a fixed support is not needed, the structure is simple and the rotating force on the exciter is small; the piezoelectric vibrators are reasonable in structure and the stresses of various points are the same after deformation; the piezoelectric vibrators are high in generating capacity, high in reliability and wide in effective band; and the runner-type piezoelectric beam energy harvester can be applied to the occasion of coaxial cantilever shaft gear and multi-gear as a standard component.

The invention relates to a large-stroke precision two-stage electric cylinder. The large-stroke precision two-stage electric cylinder comprises a two-stage piston assembly, an electric input assemblywhich provides power for the expansion and contraction of the two-stage piston assembly and a cylinder body assembly with the cross section being square, wherein the electric input assembly is fixed on the cylinder body assembly, the two-stage piston assembly is sleeved in the cylinder body assembly, one end of the two-stage piston assembly is in transmission connection with the electric input assembly, and the other end of the two-stage piston assembly stretches out of the cylinder body assembly. The large-stroke precision two-stage electric cylinder is characterized in that the two-stage piston assembly comprises a first-stage lead screw piston assembly which is in transmission connection with the electric input assembly and a second-stage lead screw piston assembly which is coaxially installed in the first-stage lead screw piston assembly, the first-stage lead screw piston assembly is in transmission connection with the second-stage lead screw piston assembly, the movement of a leadscrew of the first-stage lead screw piston assembly drives the second-stage lead screw piston assembly to synchronously move, and synchronous expansion and contraction of the first-stage lead screw piston assembly and the second-stage lead screw piston assembly are achieved. The large-stroke precision two-stage electric cylinder is small in installation space, capable of meeting large-stroke requirements, high in transmission speed, high in use reliability and high in durability and stroke precision.

The invention discloses an outdoor foldable fan. The outdoor foldable fan comprises a stator and a rotor of a motor, wherein the stator and the rotor can slide relative to each other. The rotor is provided with a polygonal through hole. A polygonal rotating shaft is arranged on the polygonal through hole. One end of the polygonal rotating shaft is connected with a front end face through a first bearing. The circumferential direction of the front end face is rotationally connected with one end of a plurality of front frameworks. The outer side of the stator is rotationally connected with one end of each of a plurality of back frameworks. The other end of each back framework is correspondingly and rotationally connected with the other end of the corresponding back framework. The portion, between the front end face and the motor, of the polygonal rotating shaft is rotationally provided with fan blades. The polygonal rotating shaft is provided with a protruding ring used for locating the fan blades. The other end of the polygonal rotating shaft is connected with a supporting rod through a second bearing. The supporting rod is identical with the polygonal rotating shaft in peripheral structure. The outer ring of the second bearing is rotationally connected with the supporting rod. The side face of the stator is provided with a clamping portion. The end of the supporting rod is provided with a drill bit. The outdoor foldable fan can be folded and is large in blowing capacity, convenient to carry and convenient to place and locate in various outdoor environments.