1206results about How to "No gap" patented technology

The invention discloses a flexible micro-positioning stage with two degrees of freedom, the design of the flexible micro-positioning stage with two degrees of freedom comprises a flexible mechanism and an integral structure, two piezoelectric ceramic drivers are adopted in the structure, the tail part of each driver is connected with a base through a bolt, and the top end of each driver is connected with a spherical joint through a thread, thereby realizing Hertz contact. The flexible mechanism of the positioning stage mainly comprises three parts of the base, flexible branched chains with entirely consistent structures and a supporting movable platform thereof. Two displacement sensors are used for measuring actual output of the movable platform and respectively fixed between the base and the movable platform through an L-shaped support and a Z-shaped support. The flexible micro-positioning stage is characterized by high resolution and fast dynamic response speed, and can be taken as an auxiliary positioning platform of a nano-imprint lithography positioning system for realizing micro-feeding and precise positioning.

The invention discloses a telescopic bidirectional loading and unloading conveyor, which belongs to the field of storage and logistics. The telescopic bidirectional loading and unloading conveyor comprises a base joint, a primary expansion joint, a secondary expansion joint, a belt conveying mechanism, a telescopic mechanism, and an elevator mechanism, wherein a front pedestal and a back pedestalare respectively arranged below the two ends of the base joint, and the back part of the base joint is hinged on the back pedestal; a lifting oil cylinder of the elevator mechanism is hinged on the front pedestal and a piston rod of the elevator mechanism is hinged on the front part of the base joint; the primary expansion joint is nested in the cavity of the base joint and can expand and contract along the base joint under the driving of the primary expansion joint; the secondary expansion joint is nested in the cavity of the primary expansion joint and can expand and contract along the primary expansion joint; the belt conveying mechanism comprises a conveying motor, a belt driven roller and a conveying belt; turnabout drums are respectively arranged at the front and back ends of the base joint, the primary expansion joint and the secondary expansion joint; and the conveying belt can be orderly wrapped on the belt driven roller and each turnabout drum to form a sealed conveying ring. The loading and unloading conveyor has the advantages of bidirectional conveying, convenient move, adjustable conveying height and distance, safety and reliability.

The invention relates to an electrical-connecting device for an underwater automatic machine, which comprises an active abutting piece and a passive abutting piece; the active abutting piece comprises a clamping-jaw lead screw, clamping-jaw mechanisms, a clamping-jaw driving mechanism, a sealing end cover, an active abutting body, an n+4-core watertight connector, an n-core penetrating piece, a contact-point seat, a contact-point mechanism, a contact-point driving mechanism and a positioning cone, wherein the clamping-jaw mechanisms are circumferentially and uniformly distributed and fixed on the lateral wall of the active abutting body, the clamping-jaw driving mechanism is connected with the clamping-jaw lead screw and is used for driving the clamping-jaw mechanisms to realize the reliable abutting and separation of the active abutting piece and the passive abutting piece, and the contact-point driving mechanism is used for driving the contact-point seat and the contact-point mechanism to move and is matched with a spring in the contact-point mechanism, so that extruding contact is formed between a contact point and a plug to realize large-current transmission; the passive abutting piece comprises the plug, an inserting rod, a passive abutting body with a cavity, a plug seat and an n-core watertight connector; and a sealing ring is respectively arranged at the mutually-connecting part of parts contacted with water. The electrical-connecting device for the underwater automatic machine has the advantages of good sealing effect, high mechanical-connecting strength and strong connecting and conducting capability, can be used for large-power electricity transmission and is suitable for being used in deep water.

The invention discloses a method for actuating a spark plug (1) in an international combustion engine, wherein the spark plug (1) is assigned a first ignition coil (42) and second ignition coil (43). Triggered by a start signal (24), the primary winding (6) of the first ignition coil (42) is charged, and the primary winding (7) of the second ignition coil (43) is charged with a delay D, for which 0<=D, by supplying a direct current, wherein, whilst each primary winding (6, 7) , is charged, the respective secondary winding (4, 5) is blocked; the primary current supplied to the primary windings (6, 7) is measured; after a period T, the primary winding (6) of the first ignition coil (42) is discharged, and with the delay D the primary winding (7) of the second ignition coil (43) is discharged; the secondary current flowing through the spark plug (1) is measured; thereafter the primary windings (6, 7) of the first and second ignition coil (42, 43) start to be charged alternately when the secondary current falls below a threshold; the primary windings (6, 7) are discharged alternately when the primary current reaches an upper threshold; the above steps are repeated until the duration of discharge between two electrodes (1a, 1b) of the spark plug (1) reaches a predefined value Z.

The invention provides a six-degree-of-freedom quasi-zero-rigidity vibration isolation system based on a Stewart platform. The system comprises an upper platform, a lower platform and six same landing legs fixed between the upper platform and the lower platform through hinge blocks. The three hinge blocks are distributed in an equilateral triangle mode, two corresponding landing legs are fixed to each hinge block, the adjacent landing legs are perpendicular, and the upper platform has six degrees of freedom relative to the lower platform. The six landing legs have the quasi-zero-rigidity characteristic, so that the vibration isolation system has the quasi-zero-rigidity characteristic on the six degrees of freedom, the all-order resonant frequency of the vibration isolation system is small, and the wide vibration isolation frequency range is achieved. The system has the advantages of being high in bearing capacity and low in resonant frequency, has the good restraint effect on low-frequency vibration, and is suitable for vibration isolation of flywheel systems and optical cameras in the spaceflight field and vibration isolation of equipment such as precision machine tools and precision measuring systems in the civil field.

The invention belongs to the field of civil engineering technology, and particularly relates to a bolted steel filling plate-sleeve connection node for a beam-post wood structure. The connection node comprises a wood beam, a wood post, a steel filling plate, a sleeve, a bolt, a gasket and a nut. The the beam-post connection node is formed by inserting steel filling plates in grooves of the wood beam and the wood post, the sleeve is embedded in the bolt hole on the beam-post connection node; after the bolt passes through the sleeve, the sleeve is pressed by the gasket through a stretch-draw bolt, so that the sleeve pushes against the steel filling plates to generate larger pressure, friction generated by pressure is utilized for shear resistance and the increasing and decreasing of pressure stress is utilized for bending resistance. The connection node is definite in force transfer and convenient for construction, and gaps at the nodes almost have no influence on the load-carrying property and rigidity of the structure; in addition, the introduction of the sleeve can also prevent the local bearing damage of the wood below the gasket and reduce the contact pressure stress at the bolt of the wood beam (post), thus being beneficial to the exertion of strength of the wood. Compared with the existing connection mode, the connection node of the beam-post wood frame has large and stable bending-resistant rigidity.

The invention discloses a dual-head 3D printer capable of rotatably switching printing heads. The dual-head 3D printer is characterized by comprising a fixing plate, an installation plate which is arranged on the fixing plate, a first printing head and a second printing head, wherein the first printing head and the second printing head are installed on the installation plate in parallel; the fixing plate is provided with a fixed rotating shaft, and the installation plate is connected to the fixed rotating shaft in a way of rotating around the axis of the fixed rotating shaft; the first printing head is arranged below the fixed rotating shaft to the left side, and the second printing head is arranged below the fixed rotating shaft to the right side; and the dual-head 3D printer also comprises a drive mechanism for driving the installation plate to rotate along the fixed rotating shaft. The installation plate is driven by the drive mechanism to rotate, so that the structure that the heights of the two printing heads can be adjusted up and down relatively in the vertical direction, the working printing head is always maintained at a relatively low position, and the non-working printing head is maintained at a relatively high position; thus, the non-working printing head does not influence the surface of a molded workpiece, and the printing quality is improved.

A precise positioning platform consists of output platform, base, three gentle and agreeable mechanisms, three piezoelectric drivers, three positioning devices, three displacement sensors and controllers. It is featured as arranging mechanism and sensors in 120 degree angle towards outside along output platform to ensure precision, stability and linearity of movement and to provide translation in X and Y direction as well as rotation in Z direction, using drivers to ensure quick response speed for achieving nanoresolution and subnauoprecision of positioning.

The invention discloses an integrated type six degrees of freedom precision positioning platform. The integrated type six degrees of freedom precision positioning platform comprises a base, a lower platform component, a middle platform component and an upper platform component. The integrated type six degrees of freedom precision positioning platform utilizes a piezoelectric ceramics brake to enable the lower platform component to achieve rectilinear motion along an X direction and a Y direction of a coordinate system, enable the middle platform component to achieve a rectilinear motion along an Z direction of the coordinate system and a rotary oscillation around an axis which is parallel to the X axis and an axis which is parallel to the Y axis, and enables the upper platform component to rotate around the Z axis. The integrated type six degrees of freedom precision positioning platform can achieve precise control position on the six degrees of freedom and effectively avoids displacement coupling among axes due to the fact that the middle platform component and the lower platform component are designed into a symmetric structure. Meanwhile, the transmission platform can achieve integral manufacture, is driven by the piezoelectric ceramics brake, has the advantages of being free from friction and coupling, being high in precision, long in journey and high in resolution rate and can meet complex manufacturing and operation requirements of nanometer science and technology studies.

The invention discloses a two-degree of freedom precise positioning work table, which comprises a base, a moving platform, a rigid support which is connected with the bottom of the base, and four flexible branched chains which are connected between the moving platform and the base, wherein each flexible branched chain comprises a moving block and three groups of flexible plate spring structures; each flexible plate spring structure consists of two '-'-shaped flexible plate springs; a first group and a second group of the flexible plate spring structures are respectively positioned at the left side and the right side of the moving block; the lower ends of the two '-'-shaped flexible plate springs of a third group of the flexible plate spring structures are connected with the side wall of the upper end of the moving block, and the upper ends thereof are connected with the side wall of the moving platform; four piezoelectric ceramics driving devices are respectively horizontally arranged; a ball-shaped joint of each driving device is supported on the side wall of the lower end of the moving block; and conducting strips of two position sensors are respectively connected with the upper plane of the rigid support and the lower plane of the moving platform. The positioning work table can be taken as an auxiliary positioning platform of a nanometer embossing photoetching positioning system to realize the microscale feeding and the precise positioning.

The invention provides a rubber conductive particle, comprising a rubber base material and metal plated film on the surface of the particle. The metal plated film can comprise one layer or a plurality of layers, and has a total thickness of 0.05mum to 1mm. The rubber conductive particle has a cylindrical shape or a platform shape, has a cross section of a circular shape, an elliptical shape, or a polygon shape, and has a cross section diameter of 1mm to 10mm. The preparation method of the rubber conductive particle comprises: first preparing a rubber sheet material with moulding, injecting, extruding, or calendering methods; then plating the metal plated film on the surface of the rubber sheet material by employing plating technique; and carrying out punching, shearing or laser cutting on the sheet material to obtain the rubber conductive particle. The rubber conductive particle of the invention is characterized by good conductivity of metal coating, thin thickness of the coating, reduction of raw material consumption, low manufacturing cost, and no pollution basically, and can be used as a conduction contact component of a push-button circuit board.

A piezoelectric clamping micromanipulator with flexible drive and amplification and adjustable range is composed of microactuator, flexible multiplying mechanism, size pre-regulator, and clamping micromanipulator. Its advantages are compact structure, high reliability, and low non-linear error.

The invention belongs to the material test technical field, to be more exactly, relates to a fatigue test sample clamp with high temperature resistance, high pressure resistance and aqueous corrosion resistance and an usage method thereof, which solves the problems of high temperature irresistance, high pressure irresistance, aqueous corrosion, large screw thread slit and poor centering in the current sample clamp. The clamp is provided with a column, a platform, an upper press cap, a lower press cap and a conversion adapter; the lower part of the column of the clamp is fixed on a cover of anautoclave, the upper part of the column of the clamp is fixed on the platform, and respectively and tightly pressed by lock nuts, the lower part of the conversion adapter is connected with a stretching shaft of a fatigue machine, through elevating the stretching shaft, an upper convex plate and a lower convex plate of the test sample are respectively placed in a platform groove and a conversion adapter groove, two dimidiate semirings are pressed on upper convex plate and the lower convex plate of the test sample, the upper press cap and the lower press cap are sleeved, the press cap bolts arescrewed for fixing two ends. The fatigue test sample clamp can be used in the autoclave for carrying out various fatigue tests (stress-stress, stress-tension, tension-tension and the like) under the high temperature high pressure solution environment, and has the advantages of simple structure and low cost.

The invention discloses a method of preparing a metal soft magnetic compound material by tape casting. The method mainly comprises the following steps: 1) mixing a passivant and a solvent according to a mass fraction of the passivant being 0.1-0.5% to obtain a passivation liquid, mixing the passivation liquid with magnetic metal powder according to a mass ratio of 0.01-1, stirring and drying to obtain passivation powder; 2) mixing the passivation powder with an organic solvent, a dispersant, a binder and a plasticizer, uniformly stirring, filtering through a screen and defoaming to prepare uniformly dispersed slurry; 3) tape casting; and 4) drying and curing. The method disclosed by the invention has the advantages that the metal soft magnetic compound material prepared by tape casting has the characteristics of high electrical resistivity and higher saturation flux density than conventional ferrite. By means of a mature tape casting process, the production process of the metal soft magnetic compound material is simplified and the cost is lowered; and the metal soft magnetic compound material has a wide application prospect in preparation of electron devices such as thin-film inductors.

The invention discloses a three-degree-of-freedom microoperation orthogonal parallel operating platform used for ultraprecise location, which realizes space three-dimensional translation ultraprecise location. The three-degree-of-freedom microoperation orthogonal parallel operating platform is provided with a static platform and a movable platform, wherein a piezoelectric ceramic driver is fixedly vertically arranged on each panel of the static platform, a drive of each piezoelectric ceramic driver is connected with the top end of a branched chain, the tail end of each branched chain is vertically connected with the movable platform, three branched chains are formed by sequentially serially connecting a flexible movable pair, a parallelogram structure, a first rotating pair and a second rotating pair according to position relationships of vertical, vertical and parallel among axial lines, the top end of each branched chain is a movable pair, the tail end of each branched chain is a second rotating pair, the three movable pairs are mutually orthogonal, and the three second rotating pairs are mutually orthogonal. According to the invention, the advantages of a parallel mechanism and a flexible movement pair are combined, a movement is generated by depending self elastic deformation, and output reaches high precision of micro level even nano level.

The invention discloses a double-reed large-turning angle flexible joint, relates to the technical field of mechanical kinematic pairs, and solves the problem that the conventional flexible hinge is small in motion range. The double-reed large-turning angle flexible joint is characterized in that a first shell is integrally formed by a 210-degree arc plate and a 90-degree arc plate; the side wall of the 210-degree arc plate and the side wall of the 90-degree arc plate are integrally connected, and the thickness of the 90-degree arc plate is smaller than that of the 210-degree arc plate; the 210-degree arc plate of the first shell is arranged outside a 90-degree arc plate of a second shell, the 90-degree arc plate of the first shell is arranged inside a 210-degree arc plate of the second shell, and a gap is formed between the first shell and the second shell; a first flexible plate is inserted into the first shell and the second shell through a first through groove and a second through groove; a second flexible plate is inserted into the first shell and the second shell through the remaining parts of the first through groove and the second through groove. The double-reed large-turning angle flexible joint is applied to the field of large-stroke precision transmission mechanisms and flexible transmission.

The invention relates to a spray freeze-drying preparation technology for a polyunsaturated fatty acid oil microcapsule, which comprises the following technological steps: mixing oil containing polyunsaturated fatty acid with emulsifier and water to obtain mixture; homogenizing the mixture to obtain emulsion; atomizing the emulsion into liquid drops which are sprayed into a spray drying device with temperature of negative 60 DEG C to negative 10 DEG C, wherein powder embedding materials are contained at the bottom part of the spray drying device, and blasting low-temperature gas to fully mix the materials in the spray drying device and to keep the temperature in the spray drying device to be the set temperature; and further drying and screening to obtain polyunsaturated fatty acid oil microcapsule products. The invention has the advantages that the drying temperature of the preparation technology is low, the speed is fast and the nutritional ingredients are not apt to be damaged; the technology is simple and convenient and the automatic mass production can be realized; and the oil embedding rate of the obtained independent polyunsaturated fatty acid oil microcapsule particles is high, the embedding performance is good, the product shelf life is long and the stability is good.

The invention provides a flexible back supporting device for a large-caliber reflector. The supporting device comprises the large-caliber reflector, a lens back plate, a supporting plate, a joint plate, a screw, flexible branch hinges, sliding flexible hinge supports, a flexible hinge connecting rod and a driving system. The three flexible branch hinges and the joint plate together form a combined hinge to constrain three degrees of horizontal moving freedom of the large-caliber reflector, the pitching and deflecting movements of the large-caliber reflector are achieved through flexible hinge blocks of the sliding flexible hinge supports and the driving system, when the driving system is tightly locked, the two degrees of rotating freedom of the large-caliber reflector are constrained, and the degree of the plane inner rotating freedom of the large-caliber reflector is constrained through the flexible hinge connecting rod. The flexible hinge structure is adopted as the supporting and positioning mechanism of the large-caliber reflector, nanoscale positioning precision is achieved, and the structural stability and the precision stability are ensured through matched design of the flexibility and the moving precision of the large-caliber reflector. The flexible back supporting device has the advantages of being simple in structure, stable in movement, free of friction or gaps, needless for lubrication and high in moving sensitivity.