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618results about How to "Increase stiffness" patented technology

Two-dimensional parallel micromotion platform driven by piezoceramic

The invention discloses a two-dimensional parallel micromotion platform driven by piezoceramic, which comprises a base, a motion platform, piezoceramic drivers, a displacement magnifying mechanism, a guiding mechanism and the like, wherein a first piezoceramic driver and a second piezoceramic driver are arranged in cylindrical grooves in the base respectively in a mutual perpendicular manner; and the output ends of the drivers closely lean against an input hinge of the displacement magnifying mechanism to transmitting movement to the motion platform through the displacement magnifying mechanism and the guiding mechanism. Through the adoption of the secondary magnifying mechanism and the compound parallel four-pole guiding mechanism, the two-dimensional parrel micromotion platform has the advantages that the structure of the micromotion platform is compact; high natural frequency is ensured when the large stroke movement is realized; the X-axis direction and the Y-axis direction can be effectively decoupled; zero friction, zero clearance, high-precision, high stability, quick respond of the movement transmission are ensured by the combination of the piezoceramic drivers and the flexure hinge platform; displacement sensors are arranged in the X-axis direction and the Y-axis direction respectively by the motion platform; and the full-closed loop control of the micromotion platform is convenient to realize.
Owner:SHANDONG UNIV

Wheel-leg composite type four-leg robot

Provided is a wheel-leg composite type four-leg robot. The wheel-leg composite four-leg robot is characterized by comprising an inner car frame, an outer car frame, a cushioning assembly, two pairs of upper leg parallel connection assemblies and four wheel type legs with identical structures. The inner car frame is arranged inside the outer car frame. The inner car frame is connected with the outer car frame through the cushioning assembly. The upper leg parallel connection assemblies of two front legs arranged below the outer car frame are symmetric with each other in a left and right mode, and two front-wheels type legs connected with the parallel connection assemblies are symmetric in a left and right mode. The upper leg parallel connection assemblies of two rear legs arranged below the inner car frame are symmetric with each other in a left and right mode, and two rear-wheels type legs connected with the parallel connection assemblies are symmetric with each other in a left and right mode. Each leg is in a (2-UPS+U) R series and parallel hybrid connection. The wheel-leg composite type four-leg robot has the advantages that the load is big, the rigidity is good, the coupling is small, the obstacle crossing advantage of the leg mechanism is fully applied, the complexity of the control and a mechanical structure is lowered, the installation is easy and convenient, and the maintenance is convenient. The positions and stress information of upper legs and lower legs can be obtained through sensors, and the self-adaption control in an unknown environment can be achieved.
Owner:秦皇岛燕盛智能科技有限公司

Large-scale thin-wall valve body lost foam casting process

The invention relates to a large-scale thin-wall valve body lost foam casting process, comprising the following steps of: (1) pre-foaming polystyrene beads; (2) curing the polystyrene beads; (3) moulding a white mould; (4) drying the white mould; (5) assembling the white mould; (6) brushing lost foam casting fireproof coating on the surface of the obtained white mould; (7) drying the white mould coated with the coating; (8) burying a box and compacting; (9) pouring molten iron; (10) insulating heat after pouring is finished, and then opening the box; and (11) cleaning off redundant anti-deformation ribs, and polishing and levelling by adopting a grinding wheel to obtain a thin-wall valve body. According to the process disclosed by the invention, when the white mould of the valve body is moulded, a cross-shaped rib which can prevent a round hole from deforming is additionally arranged in a flange hole, stiffness of the white mould is increased, deformation can be prevented; a T-shaped rib, an I-shaped rib and a diagonal tie rib are additionally arranged in an inner cavity of a square hole after assembling and adhesive bonding, an anti-deformation rib for a square opening is additionally arranged outside the square opening, and therefore deformation of the white mould after assembling is effectively overcome. When a casting is cleaned, the anti-deformation ribs inside and outside are removed, thus deformation of a workpiece is avoided and rejection rate is reduced.
Owner:SHANXI MOFAN MACHINERY MFG

Metamorphic parallel-connection robot palletizer mechanism

The invention discloses a metamorphic parallel-connection robot palletizer mechanism. One end of a first driving rod of the metamorphic parallel-connection robot palletizer mechanism is connected with a rack; the other end of the first driving rod is connected with one end of a fourth connecting rod; the other end of the fourth connecting rod is connected with a seventh connecting rod; one end of a second driving rod is connected with the other end of the rack; the other end of the second driving rod is connected with one end of a fifth connecting rod; the other end of the fifth connecting rod is connected with the fourth connecting rod; one end of a first connecting rod is connected with the rack; the other end of the first connecting rod is connected with one end of a second connecting rod and is also connected with the first driving rod, the fourth connecting rod and a third connecting rod; one end of the third connecting rod is connected with the first driving rod, the fourth connecting rod and the second connecting rod simultaneously; the other end of the third connecting rod is connected with one end of a sixth connecting rod; the other end of the sixth connecting rod is connected with one end of the seventh connecting rod; the other end of the seventh connecting rod is connected with a tail end implanter; one end of a spring is connected with the second connecting rod; the other end of the spring is connected with the third connecting rod. Compared with a conventional open-chain type parallel-connection robot palletizer, the metamorphic parallel-connection robot palletizer mechanism has the advantages of high rigidity, high bearing property, small error accumulation, and the like.
Owner:GUANGXI UNIV

Bridge deck structure composed of prefabricated UHPC (Ultra High Performance Concrete) slabs and steel bridge deck and construction method thereof

InactiveCN105064208AReduce building heightIncrease stiffnessBridge structural detailsBatch productionHigh performance concrete
The invention relates to a bridge deck structure composed of prefabricated UHPC (Ultra High Performance Concrete) slabs and a steel bridge deck and a construction method thereof. The bridge deck structure comprises the steel bridge deck and the UHPC slabs covering the steel bridge deck, wherein the UHPC slabs are arranged at intervals, UHPC cast-in-situ belts are arranged between adjacent UHPC slabs, and the bottoms of the UHPC slabs are connected with the steel bridge deck through cement based adhesives so as to form the composite bridge deck structure. Shear connectors can be appropriately arranged in the cast-in-situ belts so as to enhance the connecting effect of the prefabricated slabs and the steel bridge deck. The construction method of the structure comprises the following steps: constructing steel beams and the steel bridge deck; manufacturing and installing the UHPC slabs; constructing the UHPC cast-in-situ belts; and constructing the surface of the bridge deck. The structure is reasonable in stress, high in strength and stiffness, capable of effectively avoiding the generation of steel bridge deck defects, simple, capable of reducing relatively large shrinkage in a cast-in-situ process of UHPC, and easy to realize batch production in factories; and the structure has important practical values and favorable economic benefits.
Owner:FUZHOU UNIVERSITY

RV speed reducer cycloidal gear contour profiling method based on deformation quantity compensation

The invention discloses an RV speed reducer cycloidal gear contour profiling method based on deformation quantity compensation, and relates to the field of design and manufacturing of an RV speed reducer cycloidal gear. On the basis of the profiling gear contour determined by three conventional gear contour profiling methods, the extrusion deformation quantity of the cycloidal gear contour in the practical operation process is used as the profiling quantity to be compensated back into the gear contour of the cycloidal gear; the condition better conforms to the cycloidal gear contour profiling of an RV speed reducer applied to high-precision and high-load conditions; the transmission error of the RV speed reducer under the high-load condition can be further eliminated; and the rigidity of the speed reducer is improved. The method provided by the invention comprises the following steps of 1, obtaining the cycloidal gear contour M by using the three conventional profiling methods; 2, performing stress analysis on a cycloid pin gear engagement pair; and obtaining the cycloidal gear contour deformation quantity through calculation; and 3, using the deformation quantity as the profiling quantity to be compensated back into the cycloidal gear contour M for obtaining the final profiling contour.
Owner:SOUTH CHINA UNIV OF TECH +1

Deep sea net box cultivating apparatus for offshore wind field

ActiveCN105104271AReduces the effects of oxidation and corrosionIncrease stiffnessClimate change adaptationAgricultural fishingWind forceElectric energy
The invention discloses a deep sea net box cultivating apparatus for offshore wind field, which comprises an offshore wind turbine foundation, wherein an operation platform is mounted on the top portion of the offshore wind turbine foundation; a rotary sleeve ring fixing system is mounted on a lower end of the offshore wind turbine foundation; the rotary sleeve ring fixing system is connected to a rotary arm mechanism; the rotary arm mechanism is connected to an offshore net box module through a cable connecting rod component; the rotary sleeve ring fixing system comprises a reinforced cylinder sleeve; an upper rotary sleeve ring and a lower rotary sleeve ring are respectively mounted on an upper end and a lower end of the reinforced cylinder sleeve; and the upper rotary sleeve ring and the lower rotary sleeve ring are respectively connected to the rotary arm mechanism through an upper connecting buckle and a lower connecting buckle. According to the utility model, by adopting the apparatus provided herein, the offshore wind field can be applied with various purposes; organic combination between the offshore wind power generation and the offshore net box cultivation is realized; the space of the offshore wind field and the offshore wind power are fully utilized, thus improving the overall economy benefits.
Owner:佛山市榕岸海洋工程装备有限公司

Rectangular concrete filled steel tubular column - steel beam connection node and construction methods thereof

InactiveCN103161224AIncrease stiffnessReduce stress concentration and brittlenessBuilding constructionsFlangeMaterials science
The invention belongs to the technical field of architectural structure engineering and relates to a rectangular concrete filled steel tubular column - steel beam connection node. The rectangular concrete filled steel tubular column - steel beam connection node comprises an upper through partition board (3), a lower through partition board (4), a connection board (5) and a high-strength bolt (6). The rectangular concrete filled steel tubular column - steel beam connection node is characterized in that the upper through partition board (3) and the lower through partition board (4) penetrate through the wall of a rectangular concrete filled steel tubular column (1) and are in bevel welding connection with the periphery of the wall, the connection board (5) is connected between the lateral wall of the rectangular concrete filled steel tubular column (1) and a web of a steel beam (2), the lower through partition board (4) is connected with the bottom flange of the steel beam (2) through the high-strength bolt (6), and the upper through partition board (3) is in bevel welding connection with the upper flange of the steel beam (2). The invention further provides two construction methods of the rectangular concrete filled steel tubular column - steel beam connection node. The rectangular concrete filled steel tubular column - steel beam connection node and the construction methods thereof have the advantages that location is fast for site installation, the construction period can be shortened obviously, and the prefabricated construction progress is promoted.
Owner:TIANJIN UNIV

Polyhedral rolling mechanism

ActiveCN102673669AIncrease stiffnessUniform force distributionVehiclesEngineeringChain structure
A polyhedral rolling mechanism is characterized by comprising an upper platform, a lower platform, a first branched chain, a second branched chain, a third branched chain and a fourth branched chain. Structures and sizes of the upper platform and the lower platform are identical, and structures and sizes of the first branched chain, the second branched chain, the third branched chain and the fourth branched chain are identical; the upper end of the first branched chain and an A1 side of the upper platform are fixed, the lower end of the first branched chain and a B1 side of the lower platform are fixed; the upper end of the second branched chain and an A2 side of the upper platform are fixed, and the lower end of the second branched chain and a B2 side of the lower platform are fixed; the upper end of the third branched chain and an A3 side of the upper platform are fixed, and the lower end of the third branched chain and a B3 side of the lower platform are fixed; the upper end of the fourth branched chain and an A4 side of the upper platform are fixed, and the lower end of the fourth branched chain and a B4 side of the lower platform are fixed; and the polyhedral rolling mechanism is formed through the connection. According to the polyhedral rolling mechanism, a closed chain structure is utilized, the robot rigidity is enhanced, loading capacity is improved, structure and control are simple and moving and veering in a plane can be achieved.
Owner:BEIJING JIAOTONG UNIV
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