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87results about How to "Reduce the number of joints" patented technology

Overconstrained parallel mechanism with equivalent Tricept mechanical movement

The invention discloses an overconstrained parallel mechanism with equivalent Tricept mechanical movement. First and third driving branches are the same in structure; rotating pairs at the outer sides of universal hinges of the two driving branches are connected with a fixed platform; rotating pairs at the inner sides of the universal hinges are perpendicular to movement pairs; and spherical pairs are connected with a movable platform. The rotating pair at the outer side of the universal hinge of the second driving branch is connected with the fixed platform, and is pointed to the center of the fixed platform; the rotating pair at the inner side of the universal hinge is parallel to rotating pairs at the upper ends of the branches, and is perpendicular to movement pairs of the branches; and the rotating pairs at the upper ends of the branches are connected with the movable platform, and are parallel to opposite edges of the movable platform. A rotating pair at the outer side of a universal hinge of a middle constrained branch is connected with the fixed platform, and is pointed to the lower end point of the second branch; a rotating pair at the inner side of the universal hinge is parallel to the connecting line of upper end points of the first and third branches, and is perpendicular to the movement pairs; and the movement pairs are vertically connected with the movable platform. The overconstrained parallel mechanism has equivalent kinematics with the Tricept mechanism, remains excellent movement characteristics of the Tricept mechanism, has smaller movement pairs compared with the Tricept mechanism, and has higher rigidity and movement precision.
Owner:YANSHAN UNIV

Hexagonal space capturing rope net and knotting method thereof

The invention discloses a hexagonal space capturing rope net. The hexagonal space capturing rope net comprises six reinforcing ropes of equal length and six side line ropes of equal length, wherein ends of the six reinforcing ropes are co-knotted to form a central rope knot; the six reinforcing ribs are outwards radial by taking the central knot as a center point; the other ends of the adjacent reinforcing robes are connected through the side line ropes; the joint of each side line rope and each reinforcing robe is led out of a traction rope; more than one screen is arranged in an area formed by the reinforcing ropes and the side line ropes in a converting mode. The invention also correspondingly discloses a knotting method for hexagonal space capturing rope net. The knotting method comprises the following steps: fixing reinforcing robes, sewing the screen, and sewing the side line ropes. According to the rope net and the knotting method thereof disclosed by the invention, the storage state consistency requirements of the rope net can be met, and the inner uniformity after the ropes are stretched is guaranteed, so that the topological structure conversion requirements of the rope net from the storage state to the stretching state are effectively met, and the stretching performance of the rope net is improved.
Owner:NAT UNIV OF DEFENSE TECH

Operation robot and mechanical arm thereof

The invention provides an operation robot and a mechanical arm thereof. The mechanical arm comprises a horizontal moving joint, a first rotating joint, a connecting arm and a vertical moving joint. The first rotating joint comprises a first rotating shaft and a first outer cylinder arranged on the first rotating shaft in a sleeving mode, and the first outer cylinder can rotate around the first rotating shaft. The connecting arm is connected with the first outer cylinder and the vertical moving joint. The vertical moving joint comprises a connector and is used for driving an external component connected with the connector to move in the vertical direction. The horizontal moving joint is connected with the first rotating shaft and used for driving the first rotating joint to move in the horizontal direction. According to the operation robot and the mechanical arm thereof, the horizontal movement of the mechanical arm can be achieved through the horizontal moving joint, and the vertical movement of the mechanical arm can be achieved through the vertical moving joint; as the number of the joints is small, the structure relation is simplified, the appearance size of the mechanical arm is reduced, and the overall mass of the mechanical arm is reduced; besides, the precision of movement control is high, additional movement displacement can be avoided, and operation is easier and more convenient.
Owner:SHANGHAI MICROPORT MEDBOT (GRP) CO LTD

Fuel cell engine cooling system

The invention relates to a fuel cell engine cooling system which comprises an inner circulation pipeline and an outer circulation pipeline which are connected through a pipeline, wherein the internalcirculation pipeline comprises a fuel cell stack, a heat exchanger, a cooling liquid pump and a deionization filter, the heat dissipation outlet end of the fuel cell stack is sequentially connected tothe heat exchanger, the cooling liquid pump and the deionization filter and returns to the heat dissipation inlet end of the fuel cell stack, and cooling liquid circularly flows in the pipeline. Theouter circulation pipeline comprises a heat exchanger, a four-way valve, a booster pump, a whole vehicle radiator and an expansion valve, wherein the heat absorption outlet end of the heat exchanger is sequentially connected with the four-way valve, the booster pump, the whole vehicle radiator and the expansion valve and returns to the heat absorption inlet end of the heat exchanger, and the phasechange coolant circularly flows in the outer circulation pipeline. Since the heat exchanger is introduced, a traditional single cooling loop is changed into a double-circulation cooling loop, so thatthe problems that an original system radiator is too large in area, a pipeline is too long, ion precipitation is difficult to control and the like are solved, the cooling effect is good, and the design cost of a cooling system is reduced.
Owner:BEIJING NOWOGEN TECH CO LTD

Five-degree-of-freedom hybrid robot based on 2R1T parallel mechanism

A five-degree-of-freedom hybrid robot based on a 2R1T parallel mechanism comprises a fixed platform, a movable platform, an L-shaped vertical rack, a moving platform, three branch chain chains and a single-degree-of-freedom swing head. The movable platform is arranged on the fixed platform. The L-shaped vertical rack is arranged on the side face of the fixed platform. The three branch chain chains are arranged between a top platform and the moving platform of the L-shaped vertical rack. The single-degree-of-freedom swing head is arranged under the moving platform. The first branch chain and the third branch chain are identical in structure. The axis, close to the L-shaped vertical rack, of a U pair of the second branch chain is parallel to the axes of two revolute pairs of the first branch chain and the third branch chain. The axis, close to a connecting rod, of the U pair is parallel to the axis of the revolute pair of the second branch chain and perpendicular to the axis of a sliding pair. The axis of the revolute pair of the second branch chain is parallel to the axes, close to the moving platform, of the two U pairs of the first branch chain and the third branch chain. According to the five-degree-of-freedom hybrid robot based on the 2R1T parallel mechanism, the structure is simple, real-time control is facilitated, the working space of a machine tool can be enlarged easily, and the sensitivity of the machine tool is improved.
Owner:YANSHAN UNIV

Ball float type liquidometer with vernier display

The invention relates to a ball float type liquidometer with vernier display. The ball float type liquidometer comprises a ball float chamber and a ferromagnetic spherical floating ball arranged therein, a vernier outside the ball float chamber, a calibrated scale and a vernier guide rail. The vernier comprises magnetic steel, a frame and a rolling system which is horizontally fixed and sleeved in the frame; the rolling system comprises rolling wheels which are provided with radial grooves along a circumferential surface, rolling bearings and shafts; the magnetic steel is disposed between the ball float chamber and the frame and is fixed outside one side surface close to the ball float chamber on the frame, and the magnetic pole of the magnetic steel is right oriented towards the floating ball; the vernier guide rail is sleeved in the frame and is disposed between the magnetic steel and the rolling system; and the rolling system enables the rolling wheels to roll vertically along the vernier guide rail at groove positions through a magnetic coupling force between the magnetic steel and the floating ball. The ball float type liquidometer is simple and scientific in structure, reliable in application performance, easy to manufacture and low in cost, reduces defects in the prior art and effectively meets needs in correlation fields.
Owner:DALIAN JIAXIN ELECTROMECHANICAL INSTR CO TD

Super-high performance concrete frame structure fabricated building and construction method thereof

The invention discloses a super-high performance concrete frame structure fabricated building and a construction method thereof. A splicing unit at least comprises beam, column and floor integrated pieces prefabricated by super-high performance concrete. The height of each column is the height of a building storey; the beams are perpendicular to the side walls of the columns; the floors are located on the upper surfaces of the beams; connecting parts are arranged on the side edges of the floors; and the two ends of the columns stretch out of the end faces of the floors and the beams. When fabricating is constructed, after the prefabricated integrated pieces adjacent to the building plane, the super-high performance concrete is poured into joints between the connecting parts of the side edges of the floors to enable the prefabricated integrated pieces to form a whole. The upper storey and the lower storey of the building are connected through the columns of the beam, column and floor integrated pieces. The prefabricated integrated pieces adopt the super-high performance concrete as structure materials, and the reasonable connecting arrangement is configured, so that the average thickness of the floor and the amount of connectors and the joints between prefabricated members both are decreased substantially. The self-weight of the building is reduced substantially under the premise of guaranteeing the rigidity and strength of the building, and construction difficulty is reduced.
Owner:HUNAN UNIV

Wheel-leg composite type robot moving device and wheel-leg composite type robot

ActiveCN111391934ASolve the problem of many jointsReduce the number of jointsVehiclesLeg typeDrive wheel
The invention discloses a wheel-leg composite type robot moving device and a wheel-leg composite type robot. The wheel-leg composite type robot moving device comprises an installation part used for being connected with a robot body, a crotch joint driving part, a hip joint driving part, a first rod, a second rod, an ankle joint driving part, a wheel driving part and wheels, wherein the crotch joint driving part, the hip joint driving part, the first rod, the second rod, the ankle joint driving part, the wheel driving part and the wheels are connected successively in series. The second rod andthe ankle joint driving part are in fixed connection and other parts are in rotating connection. The installation part is connected with the crotch joint driving part. The crotch joint driving part isused for driving the hip joint driving part to rotate around the axis of the output end of the crotch joint driving part. The hip joint driving piece is used for driving the first rod to rotate around the axis of the output end of the hip joint driving piece. The ankle joint driving piece is used for driving the ankle joint driving piece to rotate around the axis of the output end of the ankle joint driving piece. The wheel driving piece is used for driving the wheel to rotate around a rotating shaft of the wheel. Compared with a traditional wheel leg type moving device, the wheel-leg composite type robot moving device has advantages that the number of joints is smaller, and control is simpler.
Owner:SHANGHAI AEROSPACE SYST ENG INST

A hexagonal space capture rope net and its preparation method

ActiveCN104790119BReduce the number of jointsWith variable topologyToolsKnotting netsEngineeringRopes course
The invention discloses a hexagonal space capturing rope net. The hexagonal space capturing rope net comprises six reinforcing ropes of equal length and six side line ropes of equal length, wherein ends of the six reinforcing ropes are co-knotted to form a central rope knot; the six reinforcing ribs are outwards radial by taking the central knot as a center point; the other ends of the adjacent reinforcing robes are connected through the side line ropes; the joint of each side line rope and each reinforcing robe is led out of a traction rope; more than one screen is arranged in an area formed by the reinforcing ropes and the side line ropes in a converting mode. The invention also correspondingly discloses a knotting method for hexagonal space capturing rope net. The knotting method comprises the following steps: fixing reinforcing robes, sewing the screen, and sewing the side line ropes. According to the rope net and the knotting method thereof disclosed by the invention, the storage state consistency requirements of the rope net can be met, and the inner uniformity after the ropes are stretched is guaranteed, so that the topological structure conversion requirements of the rope net from the storage state to the stretching state are effectively met, and the stretching performance of the rope net is improved.
Owner:NAT UNIV OF DEFENSE TECH

Decoupled two-translation one-rotation parallel robot

The invention provides a decoupled two-translation one-rotation parallel robot. The robot comprises a fixed platform, a disc slider, a motion worktable and three branch chains connected between the disc slider and the motion worktable. The robot is characterized in that the fixed platform is provided with three mutually orthogonal planes, and each plane comprises a rectangular hollow structure; the disc slider is movably embedded into the rectangular hollow structures of the fixed platform through balls inlaid in the edge; one end of a first telescopic rod of the first branch chain is connected with the motion worktable through a first rotation pair, and the other end is fixedly connected with the disc slider; one end of a fixed-length rod of the second branch chain is connected with the motion worktable through a second rotation pair, and the other end is fixedly connected with the disc slider; one end of a second telescopic rod of the third branch chain is fixedly connected with the motion worktable, and the other end is fixedly connected with the disc slider. The robot adopts the first telescopic rod, the second telescopic rod and the rotation pairs in one branch chain as driving joints, and complete decoupling control at two-translation one-rotation degrees of freedom is realized.
Owner:SHANDONG UNIV OF TECH

Technical scheme for grounding of single-core cable especially for high-speed railway

The invention relates to a technical scheme for grounding of a single-core cable especially for a high-speed railway, wherein the technical scheme is mainly suitable for a 27.5-kV single-core cable. According to the technical scheme, on the basis of characteristics of the high-speed railway traction power supply system, a 27.5-kV cable is divided into a plurality of units by combining a simulation result of a system model established by using a PSCAD / EMTDC, structural characteristics of a cable, and practical engineering information; and one end of the 27.5-kV cable in each unit is grounded directly and the other end is grounded by a protection layer voltage limiting device. The length of the cable of each grounding unit does not exceed 600m and a metal protection layer of an intermediate connector of each two grounding units is removed, thereby realizing independence of the grounding units. The cable grounding requirement at the two ends of the intermediate connector between each two grounding unit and the grounding requirement of the protection layer voltage limiting device match the grounding requirement of the 27.5-kV cable power supply loop.
Owner:CHINA RAILWAY ELECTRIFICATION SURVEY DESIGN & RES INST

Redundant-degree-of-freedom mechanical arm path planning method and device and engineering machinery

The invention provides a redundant-degree-of-freedom mechanical arm path planning method and device and engineering machinery, and relates to the technical field of mechanical arm path planning. The redundant-degree-of-freedom mechanical arm path planning method comprises the steps of determining a target pose to be reached by an execution tail end of a mechanical arm; determining joints which can keep the initial angles when the execution tail end of the mechanical arm is located at the target pose in all joints of the mechanical arm; determining path data of the execution tail end of the mechanical arm reaching the target pose based on the determined joints, specifically, the path data comprise the target angles of all the joints of the mechanical arm, and the target angle of at least one joint is equal to the initial angle of the joint; and determining the motion paths of the mechanical arm according to the path data, and making the motion path meeting the preset rule in the motion paths as the final motion path of the mechanical arm. According to the redundant-degree-of-freedom mechanical arm path planning method, the motion path of the mechanical arm is planned based on the locked joints, and thus the shaking of the execution tail end of the mechanical arm in the motion process can be effectively reduced.
Owner:ZOOMLION HEAVY IND CO LTD

Construction method for following up and injecting thixotropic slurry outside box body in pipe roofing supporting and pushing construction

The invention discloses a construction method for following up and injecting thixotropic slurry outside a box body in pipe roofing supporting and pushing construction, and belongs to the technical field of bridge and culvert construction. The method comprises the following steps: fixing a slurry injection pipe without holes outside a box body; preparing thixotropic slurry; mounting slurry ejection equipment; drilling an slurry injection hole in a soil immersion section of the slurry ejection pipe; jacking the box body; performing pressure injection on the thixotropic slurry; discharging soil of a culvert; suspending slurry injection; drilling the slurry injection hole in the soil immersion section of the slurry ejection pipe, continuously jacking the box body, and circulating the subsequent processes till the box body is jacked to a proper position; performing pressure injection on cement past to solidify the soil bodies on three sides of the box body. The method solves the problems that in the prior art, the quantity of slurry injection pipe connectors is large, a large quantity of conveying pipes are required, the construction technology is relatively complex, the construction period is relatively prolonged, and the construction cost is high.
Owner:CHINA RAILWAY SIXTH GRP CO LTD +1
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