63results about How to "Simple and symmetrical structure" patented technology

The invention relates to a free 6-UPS three-linkage parallel robot, belonging to the robot and mechanical producing area. The invention is characterized in that: three couples of straight driving branches are arranged in symmetry right triangle between the upper platform (1) and the base (2), while each couple comprises: two same SPU synchronous flexible driving branch while the upper end of each branch has a ball couple, the middle has a moving couple and the lower end has a universal couple connected to the base (2); the moving couple is formed by a mechanical or hydraulic synchronous flexible driver; the distance between two ball couples of each couple of straight driving branch is the same as the distance between two universal couple vertical axles (9). The invention is characterized in less freedom, easy control, large working space, simple structure and high accuracy. The invention can be used in large radio telescope, three-dimensional measure and sensor, etc.

Provided is an SPS+UPU+(2RPS+R) type four-freedom-degree parallel robot. The robot comprises a base, a movable platform, an SPS type support chain, an RPR type support chain, two RPS type support chains of the identical structure, a connecting rod and two T type shafts. The middle of the connecting rod is rotationally connected with the middle of the base, the two ends of the connecting rod are rotationally connected with the lower ends of the two RPS type support chains, and the upper ends of the two RPS type support chains are connected with ball pairs of the movable platform. The SPS type support chain and the RPR type support chain are symmetrically arranged on the two sides of the connecting rod, the two ends of the SPS type support chain are connected with the base and another ball pair of the movable platform, and the two ends of the RPR type support chain are connected with the movable platform and a universal pair of the base through the two T type shafts. The movable platform has the four-freedom-degree kinetic characteristic, and four freedom degrees comprise three horizontal-moving freedom degrees and one freedom degree of rotation around the connecting rod. The SPS+UPU+(2RPS+R) type four-freedom-degree parallel robot is simple in structure; the working space for the position and the gesture of the movable platform is large, flexibility is good, precision is high, bearing capacity is high, and control is easy.

The invention provides a redundant-drive three-shaft series-parallel rotary platform. The series-parallel rotary platform consists of a base platform (1), a central platform (2), an upper platform (5), four drive branches distributed around and a central limiting branch, wherein the central limiting branch is fixedly connected with the central platform (2) and is connected with the upper platform (5) by a fifth universal joint (U5); the central platform (2), the upper platform (5), the central limiting branch and the drive branches form a two-shaft parallel rotary platform with redundant drive; and the base platform (1) is connected in series with the two-shaft parallel rotary platform by a first rotation pair (R1) to form the redundant-drive three-shaft series-parallel rotary platform. The redundant-drive three-shaft series-parallel rotary platform has the characteristics of simple and symmetric structure, high loading capacity, small performance difference within work space and the like.

The invention provides a despun capture integrated device. The despun capture integrated device comprises a capture mechanism, a coupling and a despun mechanism, and the despun mechanism comprises anelectric generating machine mounted on a servicing spacecraft; the capture mechanism is connected with the despun mechanism through the coupling, after a target is captured by the capture mechanism, the despun mechanism is driven by rotation of the target to generate electricity, and thus rotation of the target is eliminated. According to the despun capture integrated device, the structure is compact, automatic centering is achieved, clamping is reliable, energy consumption is low, applicability of interfaces is wide, the despun capture integrated device can be used for targets in high speed self-spin or plane-spin states and the targets which the interface of a rotary body shape is located on a rotary shaft, continuous capturing and releasing of the targets can be achieved, stability of the targets and accuracy of gesture are guaranteed, and the despun capture integrated device has great application value in space operation tasks such as repairing, auxiliary on-orbit and off orbit offailed satellites.

The invention provides a voltage dynamic balance management system of a power lithium battery pack, which relates to a charging and discharging balancing circuit of a series power battery pack. The voltage dynamic balance management system comprises a microprocessor, Hall sensor modules, channel selecting modules, a switch driving circuit module and a DC / DC (Direct Current / Direct Current) transformer, wherein the microprocessor is used for gating a single battery in the battery pack by a first channel selecting module; an input end of the DC / DC transformer is connected with two ends of the battery pack; an output end of the DC / DC transformer is connected with two ends of the single battery by the switch driving circuit module and the switch driving circuit module; an input end of a first Hall sensor module is connected with a charging current input end and a discharging current output end of a charging and discharging switch; an output end of the first Hall sensor module is connected with the microprocessor; an input end of a second Hall sensor module is connected with a balancing charging current output end of the switch driving circuit module; an output end of the second Hall sensor module is connected with an input port of the microprocessor; an input end of the switch driving circuit module is connected with an output end of a second channel selecting module; and an output end of the circuit driving circuit module is connected with two ends of the single battery of the battery pack.

The invention discloses a material trolley positioning mechanism of an AGV. The material trolley positioning mechanism comprises installing supports, a bearing assembly and a clamping device, whereinthe two installing supports are symmetrically arranged, a running passage for allowing the AGV to pass is formed between the installing supports, the bearing assembly is arranged on the side, close tothe running passage, of the installing supports and is used for lifting the AGV, and the clamping device is arranged on the installing supports and can clamp the material vehicle in the running passage. In addition, the invention further discloses a butt jointing method applying the material vehicle positioning mechanism of the AGV. Compared with the prior art, the material vehicle positioning mechanism of the AGV can support the bottom of the material vehicle away from the ground or lift to a preset height through the bearing assembly, then the position deviation of the material vehicle in the X axis direction and the Y axis direction is corrected through the clamping device, and therefore positioning of the material vehicle in the X direction, the Y direction and the Z direction is realized; and the positioning precision of the material vehicle positioning mechanism of the AGV is higher, the structure of the material vehicle positioning mechanism of the AGV is simple and symmetrical, so that the production efficiency can be further improved, and the production cost is saved.

The invention provides an electromagnetic metasurface. The electromagnetic metasurface comprises a plurality of encoding sub-modules, each encoding sub-module comprises a first dielectric plate, a second dielectric plate, a metal reflection floor, a third dielectric plate and an air pressure switch which are sequentially arranged in the preset direction, a basic unit empty groove and a vertical through hole are formed in each second dielectric plate, and the bottom of each basic unit empty groove is communicated with the corresponding vertical through hole; a liquid metal liquid storage tank is arranged in the third dielectric plate and is communicated with the vertical through hole in the second dielectric plate; the metal reflection floor is composed of a metal patch with a hole, and anopening is formed in the center of the metal reflection floor and communicated with the vertical through hole; and the air pressure switch is arranged at the bottom of the third dielectric plate and is communicated with the liquid metal liquid storage tank in the third dielectric plate.

The invention relates to an active low-pass filter based on a positive feedback inductance substitution method, belonging to the field of analog filter design. The active low-pass filter comprises capacitor units, an input unit and an active inductance unit, wherein the capacitor cell is used to integrate the low-pass filtering performance; the second capacitor and the fourth capacitance are used to transform active inductance; the input unit is used to convert an input signal in a voltage domain; the active inductance unit is used to realize the active inductance based on positive feedback. According to the invention, a high-order active low-pass filter is designed by the inductance substitution method on the basis of the positive feedback technology, so that the filter can be influenced by process variation hardly; since analog signals are processed by using a current multiplexing technology and the voltage domain, high linearity can be obtained with low power consumption; few transistors are used, the structure is symmetrical and simple and is easy to design; and meanwhile, different pass band grains can be realized through adjusting the width ratio of a first PMOS (P-channel metal oxide semiconductor) tube to a third PMOS tube and a second PMOS tube to a fourth PMOS tube in an input part.

The invention relates to a semiautomatic vertical underground garage and belongs to the field of underground building engineering. Road boundary lines, road center lines, the ground, a garage entrance and a garage exit of a ground structure are aboveground parts of the garage; a card reader, a vehicle carrying elevator, an elevator door and a hoist are lifting mechanisms of the garage; a human carrying elevator, a walking stair, a ventilating duct shaft, garage stand columns, a garage main body structure, parking spaces and equipment pipes are underground parts of the garage. The garage structure is symmetrical and simple, reinforced concrete or steel pipe concrete is used as the material of the main body structure and the construction cost is low; the spacing of the structural columns is reasonably arranged and the usable area of the garage is maximized. In addition, since the garage is provided with auxiliary facilities, the demand of the operation management of the garage can be met, emergency situations can be coped with and the use safety is guaranteed.

The invention relates to an investment casting technology, in particular to a method for evaluating temperature field distribution in an orientated solidification process. The method comprises the following steps of: designing a mold of the same platform size, symmetrically assembling wax patterns pressed by using the mold in a module by adopting a specific crystallographic orientated seed crystal, and casting a specifically-orientated mono-crystal casting; and qualitatively evaluating the temperature field distribution situation through a rule that the temperature field distribution is more uniform when corresponding branched areas on the left and right sides of a platform are more symmetrical. According to the method, the temperature field distribution situation in the orientated solidification process can be represented qualitatively under the condition of not measuring the temperature field distribution in the orientated solidification process by using a temperature measuring instrument. Due to the adoption of the method, the problem of difficulty in accurately evaluating the temperature field distribution in the orientated solidification process can be solved, and bases are provided for qualitative judgment of the temperature field distribution situation in the orientated solidification process in practical production.

The invention provides a support frame mechanism for a rigid and flexible parallel serial condenser rotating at two degrees of freedom. The support frame mechanism comprises a condenser, a movable platform, a rack, a passive rod, a first winch, a second winch, a third winch, a first steel wire rope, a second steel wire rope and a third steel wire rope. The moving platform is provided with a first rope fastener, a second rope fastener and a third rope fastener, the three winches are respectively connected with the three rope fasteners on the movable platform through the three steel wire ropes, the passive rod comprises a Hooke joint and a support rod, one end of the support rod is connected to the center of the movable platform through the Hooke joint, and the other end of the support rod is fixedly connected onto the rack. By driving the three winches to extend and retract the three steel wire ropes connected onto the movable platform, the condenser rotates at two degrees of freedom, so that the motion of tracking the sun is completed. The mechanism is simple in structure, high in reliability, symmetric, and low in production cost, and can be modularized.

The invention provides a reconfigurable electromagnetic metamaterial. The metamaterial comprises a plurality of electromagnetic metamaterial units, each electromagnetic metamaterial unit comprises a first dielectric plate, a second dielectric plate, a metal reflection floor, a third dielectric plate and an air pressure switch which are sequentially arranged in the preset direction, a stepped emptygroove and a vertical through hole are formed in each second dielectric plate, and the bottom of each stepped empty groove is communicated with the corresponding vertical through hole; a liquid metalliquid storage tank is arranged in the third dielectric plate and is communicated with the vertical through hole in the second dielectric plate; the metal reflection floor is composed of a metal patch with a hole, and an opening is formed in the center of the metal reflection floor and communicated with the vertical through hole; and the air pressure switch is arranged at the bottom of the thirddielectric plate and is communicated with the liquid metal liquid storage tank in the third dielectric plate.

The invention provides a device and a method for carrying out acidolysis by adopting an I-type glass tube. The device comprises the I-type glass tube for providing an acidolysis reaction space, a magnet, a magnetic stirrer, a sample boat for storing samples, a connecting joint arranged at a top tube opening of the I-type glass tube and a magnetic stirrer, wherein an acidolysis reaction solution iscontained in the I-shaped glass tube, the magnet is located on one side of the outer wall of the I-shaped glass tube, the magnetic stirrer is located on one side of the inner wall of the I-shaped glass tube, and the magnet and the magnetic stirrer are attracted and fixedly arranged on the I-shaped glass tube. The sample boat is placed in the I-shaped glass tube in a manner that an opening is upward, and the sample boat is supported on the magnetic stirrer; by adopting a symmetrical structure, on the basis of ensuring the quality of experimental data, the operation is simpler and more convenient, the experimental process is greatly simplified, and the risk of experimental failure is reduced.

The invention discloses a high-speed precision pneumatic main shaft. In a turbine shaft (16), a back end bearing (1) and a middle bearing (5) are arranged in a box body (11); the turbine shaft (16) and a turbine (22) are integrated, and the outer diameter of the turbine (22) is not larger than the outer diameter of the turbine shaft (16); a nozzle driven by air current impact corresponding to the turbine (22) is arranged in the box body (11); air outlets (27) are formed at the two ends of the turbine chamber of the turbine (22); in an executing mechanism, a front end bearing (8) is arranged in the box body (11); the turbine shaft (16) is connected with the executing mechanism through an integral micro flexible connecting mechanism. The high-speed precision pneumatic micro main shaft has the advantages of novel and reasonable design, simple and compact structure, small size, simple manufacturing process, high rotating speed and small jumping errors, can be taken as a micro main shaft of a micro machine tool for performing fine cutting and fine grinding as well as a micro main shaft of other electromechanical or manual tool machines revolving at high speeds, ultrahigh speeds and high accuracies, and the like.

The invention discloses a dual-frequency multilayer planar reflection array antenna which comprises a directional feed source and a high-frequency reflection surface, a high-frequency hollow-out site,an anti-reflection surface, a low-frequency reflection surface and a low-frequency complete site which are sequentially laminated and placed in parallel. The dual-frequency multilayer planar reflection array antenna is simple in structure; by respectively designing the high-frequency reflection surface and the low-frequency complete site on both different upper and lower layers, on the basis of afrequency selective anti-reflection technology, independent design of antenna units can be implemented on two separated electromagnetic wave frequency bands; and the dual-frequency multilayer planarreflection array antenna supports dual-frequency dual-polarization simultaneous working and can fulfill the design aims of high gain and low minor lobe on each frequency band and under each type of polarization.

The present invention discloses a helical rotor of high-concentration hydrapulper. Said helical rotor includes the following several portions: rotor core, helical blades, toothed blades and base plate. The upper portion of said rotor core is made into the form of circular cylinder and its tower portion is made into the form of cone, the bottom portion of said cone body is connected with the described base plate, the circular cylinder body portion of said rotor core is equipped with three helical blades, the toothed blades are placed on the base plate and connected with the helical blades respectively. Besides, said invention also provides the working principle of said hydrapulper and its operation method.

The invention discloses an isolated high-frequency dual-active-bridge converter based on a gallium nitride device. The converter comprises a high-voltage three-phase full-bridge circuit module, a low-voltage three-phase full-bridge circuit module, a three-phase energy transfer inductor, a three-phase high-frequency coaxial transformer and a DSP module. The isolated high-frequency dual-active bridge converter provided by the invention is symmetrical and simple in structure, and the electronic power switch adopts a gallium nitride power device, so that the switching frequency of the dual-active bridge converter can be improved to a range of 100kHz-1MHz. The three-phase high-frequency coaxial transformer adopts a coaxial structure, so that the volume and the weight of passive elements are reduced, the electromagnetic interference is reduced, the power density of the converter is improved, electric energy can be transmitted in two directions, and the transmission direction can be quickly switched. According to the embodiment of the invention, high switching frequency and high power density can be provided in an application occasion with strict limitation on volume and weight, and the technical problems of relatively low switching frequency and relatively large volume and weight of a traditional dual-active bridge converter in the prior art are solved.

The invention discloses a photonic crystal waveguide sextupole split mode interference FANO resonant structure. The structure comprises a two-dimensional photonic crystal linetype waveguide composed of a plurality of dielectric cylinders with the refractive index, the two-dimensional photonic crystal linetype waveguide comprises two waveguide ports and one point defect resonant cavity, wherein thetwo waveguide ports are arranged on the two sides of the point defect resonant cavity respectively. The point defect resonant cavity comprises four dielectric cylinders and one point defect dielectric cylinder with the cross section long side being perpendicular to a waveguide axis and the length-width ratio being 1.43-1.45. Two dielectric cylinders are symmetrically arranged on the two sides ofthe point defect dielectric cylinder respectively, and the centers of the four dielectric cylinders and the point defect dielectric cylinder are distributed and arranged at equal intervals. The structure provided by the invention is compact, bright mode and dark mode of Fano resonance can be conveniently controlled, and Fano resonance is easy to achieve integration with other photonic crystal devices.

The invention discloses a dual-frequency high-power over-mode waveguide bend, and belongs to the technical fields of microwave and millimeter wave. The bend comprises a 90-degree bend oval waveguide,and an input end transitional structure and an output end transitional structure arranged at the two ends; and the waveguide bend inner wall is in smooth transition. By virtue of mode selection characteristic, different working modes can be selected in different frequency bands to realize dual-frequency operation; and the dual-frequency high-power over-mode waveguide bend has the advantages of simple and symmetrical structure, convenience in processing and assembling, high broadband efficiency, extremely wide bandwidth particularly in a TE<11> mode, large cross section dimension, high power capacity and the like.

The invention belongs to the technical field of robots, and particularly relates to a swinging and translation plane mechanism. The swinging and translation plane mechanism comprises a base, a first swinging device, a telescopic device, a second swinging device and a movable platform, wherein the movable platform is connected with the base through the first swinging device, the telescopic device and the second swinging device correspondingly, the first swinging device and the second swinging device are both hinged with the movable platform, the end of the telescopic device is fixedly connectedwith the base, and the first swinging device and the second swinging device are arranged on two sides of the telescopic device respectively. According to the swinging and translation plane mechanism,only a few motors are needed, a simpler and symmetrical structure is used to finish translation, the prior art is improved through innovative improvement of the structure, the same effect is achievedby reducing the number of parts, the advantage of fast platform speed is embodied while the structure is simple, and the working efficiency is improved. In addition, the invention provides a workingmethod of the swinging and translational plane mechanism, so that the working stability and efficiency of the mechanism are improved.

The invention discloses a micro spindle for fine machining. A turbine 19 is arranged in the middle of a spindle rotor 16 and is driven by a high-speed airflow provided by a turbine nozzle 18, the spindle rotor 16 adopts a front-end porous static pressure gas radial bearing 13 and a rear-end porous static pressure gas radial bearing 14 radial support, a baffle 21 is arranged at the rear end of the spindle rotor 16, a front-end porous static pressure gas thrust bearing 3, a rear-end porous static pressure gas thrust bearing 2 axial support, a rear-end bearing supporting part 20, the turbine nozzle 18 and a front-end bearing supporting part 17 are sequentially installed in a box body 1 and are fixed through an installing plate 11, and a micro cutter 15 is clamped at the front end of the spindle rotor 16 through a thermal expansion and cold contraction effect. The micro spindle is reasonable in design, simple in structure, small in size, convenient to manufacture, high in rotating speed and small in bounce error, can serve as the micro spindle for a micro machine tool for fine machining and can be also used as the micro spindle for other high-speed high-precision micro electro mechanical devices or manual tool machines and the like.

The invention relates to an ultra-low voltage nand gate circuit, which belongs to the field of design of ultra-low voltage circuits implemented by adopting the CMOS (complementary metal oxide semiconductor) process. A single-end input and single-end output structure is constituted by two ultra-low voltage nand gate basic units; and the output ends of the first and the second ultra-low voltage basic units are connected together as the output end of the single-end input and single-end output structure of the ultra-low voltage nand gate circuit. Or a differential input and differential output structure is constituted by four ultra-low voltage nand gate basic units; the input ends of the second and the third ultra-low voltage nand gate basic units are connected as the two differential input ends of the circuit; the input ends of the first and the fourth ultra-low voltage nand gate basic units are connected as the two differential input ends of the circuit; and the output ends of all the basic units are used as the two differential output ends of the circuit respectively. The body biasing technology of a PMOS (positive-channel metal oxide semiconductor) transistor is adopted, thereby being capable of working under ultra-low voltage, being symmetrical and simple in structure, being easy to design, and being good in symmetry of rising edge and falling edge of output signals.

The invention discloses a stator winding, a motor stator and a motor. Each phase of winding is formed by connecting 6Y branches in parallel, and the number of slots of each pole and each phase is 2. Each phase of winding is at least provided with a plurality of conductor groups I arranged at intervals in the circumferential direction of the stator core, and is further provided with a plurality ofconductors I and / or a plurality of conductor groups II arranged along the circumferential direction of the stator core, wherein the conductor groups I are arranged on the innermost layer and the outermost layer of the stator core in the radial direction; the conductor group I arranged at the innermost layer in the radial direction of the stator core and the conductor group I arranged at the outermost layer in the radial direction of the stator core are arranged in a staggered manner along the circumferential direction of the stator core; other layers in the same radial direction as the conductor group I are the conductor I and / or the conductor group II; and other layers which are not in the same radial direction with the conductor group I are the conductors I or the conductor groups II; The adjacent conductor group I and / or conductor group II and / or conductor I are stacked along the radial direction of the stator core, and two in-slot sections inserted into the adjacent slots of the stator core are arranged in different layers in the two adjacent slots in the same radial direction of the stator core. The structure is simple, magnetic circuits are symmetrical, and loop current is eliminated.

The invention provides an 8-shaped like planar broadband circularly polarized antenna. The planar broadband circularly polarized antenna comprises a dielectric substrate, a top-layer radiation unit and a bottom-layer radiation unit, wherein the top-layer radiation unit is arranged on an upper surface of the dielectric substrate; the bottom-layer radiation unit is arranged on a lower surface of the dielectric substrate; the top-layer radiation unit and the bottom-layer radiation unit are the same in sizes and structures; the top-layer radiation unit consists of a top-layer metal strip radiation unit and a top-layer metal half-wave dipole unit which are connected with each other; the bottom-layer radiation unit consists of a bottom-layer metal strip radiation unit and a bottom-layer metal half-wave dipole unit which are connected with each other; and the top-layer radiation unit and the bottom-layer radiation unit are arranged in an inversesymmetry way like the number 8 relative to the dielectric substrate. The structure is suitable for the broadband circularly polarized antenna. Through adoption of the 8-shaped like planar broadband circularly polarized antenna, the antenna structure is symmetric and simple; convenientfeed is achieved; and broadband wide-beam circularly polarized radiation can be realized. Moreover, the antenna is small in size, and low in manufacturing cost.