46results about How to "Uniform preload" patented technology

The invention discloses an automatic flexible assembling and calibration platform and method for a meter-scale reflector. The automatic flexible assembling and calibration platform for the meter-scalereflector comprises a base and a rotary table rotatably mounted on the upper portion of the base; the rotary table comprises an assembling panel and a jacking plate; a positioning pin which can be close to or far away from the jacking plate is arranged on the assembling panel in the circumferential direction of the jacking plate; a flexible cleaning pad is arranged on the upper surface of the jacking plate; and lock screw assemblies are arranged on the two sides of the assembling panel. By adopting the automatic flexible assembling and calibration platform and method for the meter-scale reflector, the problem in automatic flexible batch assembling and calibration of the meter-scale reflector is solved, the cleaning problem caused by manual intervention is avoided, the assembling and calibration efficiency is greatly improved, the pre-tightening forces in all positions of the reflector are uniform, the front-wave error caused by reflection is reduced, and the assembling and calibrationquality and stability of the reflector can be improved; and meanwhile, the assembling and calibration platform and method can be popularized and applied to the assembling and calibration process of other precise optical elements.

The invention relates to a three-dimensional elliptical vibration cutting device, belonging to the field of cutting and ultra-precision cutting machining of materials which are difficult to machine. A diamond cutter is guided through flexible hinge mechanisms respectively along an X direction, a Y direction and a Z direction, and further, is driven by three piezoelectric stacks respectively alongthe X direction, the Y direction and the Z direction; the piezoelectric stacks of the X direction and the Z direction are preloaded by preloading screw bolts along respective axial direction; the piezoelectric stack of the Y direction is preloaded through a screw bolt screwing wedge; the preloading processes of the three directions are mutually independent; through regulating and matching the initial phase position and the amplitude of a driving signal for each of the three piezoelectric stacks, the projections of the cutter location point movements of the diamond cutter in an X-Y plane and aY-Z plane are elliptical motions, and the projection of the cutter location point movements of the diamond cutter in an X-Z plane is reciprocating elliptical motion or linear motion. The three-dimensional elliptical vibration cutting device has a novel and simple structure, is easy to implement, and is beneficial to obtaining the best cutting machinability of the diamond cutter.

The invention discloses an integrated side pressure V-shaped spring. The basic parameters of the integrated side pressure V-shaped spring include the material thickness and the width and height of a single-side opening of the spring. The integrated side pressure V-shaped spring is formed by directly bending a plane material by an annular column. The axis of the annular column is the center line of the spring. The single-side opening of the spring is a variable and changes along with changes of the angle of a conical head of the column. The central cross section of the spring is of left and right V-shaped openings. The angle theta of each V-shaped opening is smaller than 180 degrees. The two sides of the V-shaped openings can be of the same height and can also be of the different heights. The whole spring is of an annular structure.

A lifting jack with a lifting pre-tightening device comprises an upper clamping jack body, a main jack body, a lower clamping jack body and the lifting pre-tightening device which are sequentially connected. The lifting pre-tightening device is composed of upper lifting clamping sheets, a pressing plate and a pre-tightening block. The pre-tightening block is a short cylinder with a boss at the bottom, and n conical holes used for mounting of the upper lifting clamping sheets are formed in the short cylinder. The pressing plate is in the shape of a circular ring, m through holes are formed in the circular ring, and an inner step is arranged in the circular ring. In the work state, the pre-tightening block is fixedly arranged on the upper clamping jack body of the main jack body, and the upper lifting clamping sheets are arranged in the conical holes, corresponding to the steel strands needing to be adjusted, of the pre-tightening block; and the pressing plate is located outside the pre-tightening block, the inner step of the pressing plate is clamped on the boss of the pre-tightening block, and bolts and gaskets penetrate the through holes in the outer surface of the pressing plate, so that the pressing plate, the pre-tightening block and the upper clamping jack body are connected. According to the lifting jack with the lifting pre-tightening device, in the lifting process, the problematic steel strands can be evenly pre-tightened in time, m is an integer from 2 to 20, and n is an integer from 7 to 66.

The invention discloses a giant magnetostriction rotary ultrasonic vibration device comprising a knife handle, a primary winding, and two sets of bearing systems. A secondary winding is arranged on the knife handle, and the primary winding and the secondary winding are connected through inductive coupling; a giant magnetostriction transducer is installed at the lower part of the knife handle; thegiant magnetostriction transducer is sleeved with the two sets of bearing systems; and the bottoms of two sets of bearing systems are opposite and the two sets of bearing systems are connected by screw threads. An air cooling system is adopted to cool the giant magnetostriction transducer, and the problem of heat generation of the giant magnetostriction transducer in actual processing can be effectively solved; copper stranded wires are adopted by driving coils, compared with commonly used copper wires, the copper stranded wires are more conducive to heat dissipation, and the operating temperature of the coils is reduced; a thin-walled sleeve inside a transducer shell and a flange are arranged to ensure the coaxiality of the flange and the transducer shell, and the giant magnetostriction rod is subjected to uniform pre-tightening force; and the sleeve is arranged to facilitate the outward diffusion of heat generated by the giant magnetostriction rod and the coils.

The invention relates to a multi-rotor bionic habitat drone and an attachment movement method, belonging to the technical field of robot applications. The perching device (B) is fixed directly above the multi-rotor UAV (A) through the connecting plate (1), including N symmetrically installed toe mechanisms (C~F) and power system (G); threaded push rod motor (2 ) forward or reverse rotation to drive the perching device (B) to shrink or expand; the above-mentioned toe mechanisms (C-F) include curly soles (10), adhesive materials (9), guide rollers (8) and claw push rods (11 ); the first end of the hook push rod (11) is hinged with the threaded flange bracket (4), and the guide roller (8) is installed on the second end of the hook push rod (11) and is always connected with the second end of the curly sole (10) Tangent to the lower surface of the end. The perching device of the present invention can be charged in the air, and simultaneously adapts to the horizontal top surface, the horizontal cylindrical surface and the horizontal circular hole top surface, so as to realize the all-weather multi-habitation function of the multi-rotor UAV.

The invention relates to a loosening prevention structure and a contact assembly and circuit breaker using the same, which are used for solving the problem that a threaded connection structure in the prior art is easy to loosen during switch-on and switch-off of the circuit breaker. In the loosening prevention structure disclosed by the invention, a canted-coil spring is arranged between a first connection element and a second connection element, thus, the canted-coil spring can be pressed by a first push surface or a second push surface to make the canted-coil spring compressed and deformed along a plug-in direction (namely, an axial direction of the first connection element) of the two connection elements and then apply a pre-tightening force, far away from the second connection element along an axial line, to the first connection element during the process that the first connection element is screwed into the second connection element, thread teeth, adapted to each other, of the first connection element and the second connection element can be contact and are engaged by means of the pre-tightening force, and an effect of preventing a thread joint surface from loosening is achieved; and meanwhile, the canted-coil spring is beneficial for enabling relatively uniform force applying and deformation of all positions where the canted-coil spring between the first push surface and the second push surface is arranged, a more uniform pre-tightening force can be provided for the first connection element, and a loosening prevention effect is better.

The invention relates to an extrusion forming mold. The extrusion forming mold comprises a mold sleeve; a ladder-shaped inner cavity penetrating a vertical direction is disposed in the mold sleeve; the inner cavity comprises a mold plate cavity, a mold core cavity and an open cavity successively along an axial direction; a mold core is arranged in the mold core cavity; a mold plate is arranged in the mold plate cavity; an outer peripheral surface of the mold plate is sleeved by an elastic ring that elastically contracts and expands in a radial direction; the elastic ring is provided with an inner peripheral surface matching the outer peripheral surface of the mold plate in a flexible support manner and an outer peripheral surface matching with the inner wall of the mold plate cavity in a flexible support manner. With the extrusion forming mold, cracking phenomenon of the mold plate can be prevented and a service life of the mold is prolonged.