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57results about How to "Expand the operating area" patented technology
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Improved-overmodulation based method for improving alternating current motor torque output capacity
ActiveCN104917438AExpand the operating areaImprove voltage utilizationElectronic commutation motor controlAC motor controlPower inverterEngineering
The invention relates to an improved-overmodulation based method for improving the alternating current motor torque output capacity. The method comprises: a current PI regulator outputting voltage vectors Ud and Uq of d and q axes according to id*, iq*, id, and iq; when the alternating current motor is operating in a non-weak magnetic region, obtaining voltage vectors Ualpha and Ubeta of alpha and beta axes by performing coordinate transformation on Ud and Uq; when the alternating current motor is operating in a weak magnetic region, obtaining optimized voltage vectors Udn and Uqn of the d and q axes by applying a voltage optimization method to Ud and Uq, and obtaining Ualpha and Ubeta by performing coordinate transformation on Udn and Uqn; setting different modulation regions according to the magnitude of Ualpha and Ubeta, and outputting corrected voltage vectors Ud* and Uq* of the d and q axes according to Ualpha and Ubeta; and finally, performing spatial voltage vector modulation to generate a switch action signal for on / off control of an IGBT in an inverter. Compared with the prior art, the method of the invention has the advantages that the bus voltage is high in utilization rate, the increase of output torque is large, and the current response is quick.
Owner:TONGJI UNIV
Sewing machine and method of controlling operation of the same
ActiveCN102560915AAchieving perfect stitchesExpand the operating areaProgramme-controlled sewing machinesLeather sewingEngineeringSewing machine
A sewing machine is provided, which includes a table, support posts, upper and lower frames, a head unit, a bed unit, an X-axial head-unit-transport means and an X-axial bed-unit-transport means. An object is placed on the table. The support posts are provided on opposite sides of the table. The upper and lower frames connect the support posts to each other. The head unit is provided on the upper frame so as to be movable in an X-axis direction. The head unit has a head-unit-rotating means for rotating a sewing head. The bed unit is provided on the lower frame so as to be movable in the X-axis direction. The bed unit has a bed-unit-rotating means for rotating a sewing bed. The X-axial head-unit-transport means moves the head unit on the upper frame horizontally. The X-axial bed-unit-transport means moves the bed unit on the upper frame horizontally.
Owner:SUNSTAR KK
Optical generator
The invention relates to an optical generator for providing different combustion modes during combusting different fuels in different combustion chambers. The optical generator is characterized in that an elongated cylinder (302), an elongated cylinder sleeve (303), an elongated piston (203) and a circular gasket (101) are additionally mounted between an original cylinder (305) and a cylinder cover (301), a valve timing mechanism (308) is assembled on the cylinder cover (301), a circular aluminum alloy briquetting (201) and a transparent combustion chamber window (202) are mounted at the upper part of the elongated piston (203), a reflector (304) at 45 degrees with the axis of the piston is obliquely arranged at the lower part of the elongated piston (203), an angle scaler (5) is arranged on a generator crankshaft (307), an air cylinder pressure quartz sensor (7) is assembled on the cylinder cover (301), and a valve lift-range inductor sensor (9) is mounted on the valve timing mechanism (308).
Owner:JILIN UNIV
Deburring equipment for aluminum alloy hub
InactiveCN107378679AAchieve removalIncomplete removalEdge grinding machinesGrinding drivesHydraulic cylinderFixed frame
The invention discloses a deburring device for an aluminum alloy wheel hub, which comprises a machine body, a hydraulic cylinder is arranged in the middle of the top of the body, a support seat is fixedly connected to the bottom of the body, and a workbench is arranged in the middle of the body. The invention achieves the purpose of removing the burrs on the upper and lower edges of the workpiece by setting the hydraulic cylinder, the first motor, the support rod and the first slide rail, and solves the problem of incomplete removal of the burrs on the workpiece. , a rotating rod and a rotating table solve the problem of low efficiency of the existing deburring equipment. By setting anti-slip lines on the bottom surfaces of the four support seats, the situation of equipment sliding during use is avoided. A debris collection tank is set up on the side to avoid potential safety hazards caused by the accumulation of debris on the workbench. By fixing the second motor on the second motor fixing frame, the stability of the second motor is effectively improved and the stable operation of the equipment is ensured. .
Owner:汤月红
Device and method for controlling a belt-type continuously variable transmission for a vehicle
InactiveCN102667255AMaintain presumption accuracyExpand the operating areaGearing controlControl theoryGear ratio
Disclosed is a continuously variable transmission that expands the operating range over which belt-slip control is allowed, while maintaining the estimated precision of the belt-slip state. This reduces belt friction, thereby reducing the drive energy used. A belt (44) is wrapped around a primary pulley (42) and a secondary pulley (43), and a secondary hydraulic pressure is controlled to produce a belt clamping force in accordance with input torque from an engine (1). The disclosed belt-type continuously variable transmission for a vehicle is provided with a belt-slip control means (fig. 8) and an input-torque change-rate limitation means (step S23 in fig. 12). When the rate of change of the input torque is less than a given value, the belt-slip control means controls the secondary hydraulic pressure on the basis of a phase difference (?) between a vibration component due to oscillation in the actual secondary hydraulic pressure and a vibration component due to oscillation in an actual gear ratio. The input-torque change-rate limitation means uses prescribed acceleration limitation allowance conditions to determine whether or not the acceleration of the vehicle may be limited (steps S21, S22, and S26 in fig. 12), and if so, limits the input-torque change rate to less than the aforementioned given value.
Owner:NISSAN MOTOR CO LTD +1
Rotor, axial gap type motor, driving method of motor, compressor
InactiveCN101107762ASmall torqueIncrease working pointMagnetic circuit rotating partsMagnetic circuit stationary partsMotor driveReverse salient
A rotor, an axial gap type motor comprising the rotor having reverse salient polarities and rotatable around a prescribed axis, a motor driving method, and a compressor. A plurality of magnets (12a, 12b) are annularly disposed on a substrate (11) with their polarities set symmetrical about a shaft hole (10). For example, the magnets (12a, 12b) present N-poles and S-poles on their stator side (toward you from paper surface). The plurality of magnetic substances (13a, 13b) are disposed vertically to the rotating axis direction, more specifically, extendedly between the magnets (12a, 12b).
Owner:DAIKIN IND LTD
Exhaust gas purifier and system for exhaust gas purification
ActiveCN102057139AExpand the operating areaReduce heatGas treatmentInternal combustion piston enginesEngineeringProduct gas
An exhaust gas purifier (10) which includes an NOx catalyst (12) of the selective reduction type and a DPF (14) which have been serially arranged, the purifier being disposed in the exhaust passage (2) of an internal combustion engine. The purifier (10) further includes a passage for urea supply (16) having a hydrolysis catalyst (15) deposited therein and a passage for HC supply (18) having an oxidation catalyst (17) deposited therein, the passages (16) and (18) being disposed in parallel on the upperstream side of both the NOx catalyst (12) of the selective reduction type and the DPF (14). The purifier (10) furthermore includes a urea feeder (20) which supplies urea to the passage for urea supply (16) and an HC feeder (21) which supplies HCs to the passage for HC supply (18). Due to the constitution, the system for exhaust gas purification (1), which employs both the NOx catalyst (12) of the selective reduction type and the DPF (14), reconciles the injection of an ammonia solution with the direct injection of HCs into the exhaust pipe in a compact space.
Owner:ISUZU MOTORS LTD
Converter control method
ActiveCN102007678AImprove power factorSmall sizeAC motor controlAc-dc conversion without reversalEffective powerControl signal
It is possible to control a DC voltage in accordance with fluctuation of a power source voltage without requiring detection of an effective power source voltage value. A PI control unit (702) performs PI control for a difference (deltaVdc) between a DC voltage instruction (Vdc*) and a DC voltage (Vdc) and outputs a d-axis current instruction value (Id*). A PI control unit (704) performs PI control for a difference (deltaId) between a d-axis current instruction value (Id*) and a d-axis current (Id) and outputs a d-axis voltage instruction value (Vd*). A PWM control unit (709) outputs a switching control signal (G1) which controls a converter switching operation according to the d-axis voltage instruction value (Vd*) and a q-axis voltage instruction value (Vq*). A DC voltage instruction (Vdc*) is generated by a voltage instruction calculation unit (710) according to the d-axis voltage instruction value (Vd*).
Owner:DAIKIN IND LTD
Multi-position cutting device for furniture manufacturing
InactiveCN110843041AEfficient translationImprove mobile efficiencyProfiling/shaping machinesBark-zones/chip/dust/waste removalElectric machineryEngineering
The invention relates to the field of furniture manufacturing, and particularly relates to a multi-position cutting device for furniture manufacturing. The multi-position cutting device comprises a horizontally-arranged fixed mounting plate, wherein supporting mounting plates are symmetrically arranged at the two ends of the upper side of the fixed mounting plate; the supporting mounting plates are vertically arranged; a movable guide column is horizontally arranged between the upper ends of the supporting mounting plates; guide mounting frames are longitudinally arranged on the supporting mounting plates right opposite to the two ends of the movable guide column; a guide mounting cylinder is arranged on the outer side of the movable guide column in a matched mode; and steering motors arevertically arranged in the middle of the lower end of the guide mounting cylinder. Through a guide moving structure, an operation structure of the device can efficiently move horizontally, and the operation area is remarkably improved; meanwhile, a rotary lifting structure is matched, so that the cutting angle and the station are increased, and the operation efficiency and quality are improved; and chippings are collected and guided out, so that the operation surface is clean and tidy, the moving efficiency of plates is improved, and the machining efficiency is further improved.
Owner:江苏傲森博林家具有限公司
Single-phase switched reluctance motor capable of alternating operation through adoption of direct current motor principle and reluctance motor principle
InactiveCN107222079AImprove power densityImprove operational efficiencyDynamo-electric machinesPosition angleMagnetic reluctance
The present invention provides a single-phase switched reluctance motor capable of alternating operation through adoption of a direct current motor principle and a reluctance motor principle. The single-phase switched reluctance motor is a stator and rotor structure having double salient poles, the stators are internally provided with excitation windings, the rotor salient poles are provided with corresponding armature windings capable of allowing the motor to run according to the direct current motor principle, the current direction of the rotor armature windings is in tangent relation with the magnetic line of a magnetic field formed by stator excitation windings, a code disc capable of association with stator salient pole distances and rotor salient pole distances and reflection of position angles of feature points at the position where the rotors are rotated, and optocouplers are employed to perform direct detection to control the switching of two motor running modes of magnetic resistance and direct current. The motor power density and the running efficiency are improved, and the torque generated through alternating operation according to the direct current motor principle and the reluctance motor principle is overlapped to reduce the torque ripple.
Owner:杭州小爻科技有限责任公司
Laitance removing device suitable for semi-flexible pavement
ActiveCN105274926AExpand the operating areaImprove cleaning efficiencyRoads maintainenceRoad surfaceEngineering
The invention discloses a laitance removing device suitable for a semi-flexible pavement. The laitance removing device comprises a rack and an air blower. The rack comprises a rectangular frame. Two supporting rods extend downwards vertically from the front ends of the two sides of the rectangular frame respectively. A scraper beam close to the ground is arranged between the two supporting rods. The lower portions of the two supporting rods are each provided with a baffle beam. The two baffle beams extend to the front portions of the two sides of the rectangular frame respectively and the tail ends of the baffle beams are each provided with a guide wheel borne on the pavement. A rubber baffle is arranged below each baffle beam. A laitance scraper is arranged on the rear side face of the scraper beam. The bottom of the laitance scraper is tightly attached to the pavement and the laitance scraper is provided with a slope extending from the rear edge of the upper surface of the scraper beam to the position, behind the scraper beam, of the pavement. The air blower is arranged on the rectangular frame, an exhaust duct of the air blower extends obliquely to the position, behind the slope on the laitance scraper, of the pavement and to the position close to the lower edge of the slope, and the tail end of the exhaust duct is parallel to the laitance scraper.
Owner:GUANGZHOU UNIVERSITY
Multidirectional fruit picking and collecting integrated device
PendingCN108684315AImprove ease of useImprove picking efficiencyPicking devicesEngineeringIntegrated devices
Owner:HEFEI UNIV
Self-stirring type dredging device for river channels
InactiveCN102493514AExpand the operating areaImprove work efficiencySoil-shifting machines/dredgersHydraulic motorEngineering
The invention relates to a self-stirring type dredging device for river channels; the self-stirring type dredging device comprises a main frame assembly which is arranged on a walking assembly; rubber tracks are arranged at the two sides of the walking assembly; a closed type power assembly is arranged on the main frame assembly; a movable arm assembly is articulated at the front end of the main frame assembly; a movable arm oil cylinder is articulated between the main frame assembly and the movable arm assembly; the front end of the movable arm assembly is articulated with a bucket rod assembly; a bucket rod oil cylinder is articulated between the bucket rod assembly and the movable arm assembly; a rotary stirring device is fixed at the front end of the bucket rod assembly; a rotary hydraulic motor is fixedly connected on the rotary stirring device; a bulldozing device is arranged at the front end of the walking assembly; and the movable arm oil cylinder, the bucket rod oil cylinder, the rotary hydraulic motor and the bulldozing device are controlled by the closed type power assembly. The self-stirring type dredging device is flexible, efficient and safe.
Owner:SHANDONG UNIV
Step-type anchoring robot of fully mechanized excavation face
PendingCN111608705ASimple structureSmooth goingDrilling rodsUnderground chambersSupporting systemControl engineering
The invention discloses an anchoring intelligent device, belongs to the field of fully mechanized excavation face mechanical and electrical equipment and comprises four parts including a net struttingsystem, an anchoring system, a ground supporting system and a power and turning system, wherein the net strutting system is installed above the ground supporting system; the anchoring system is installed by screws under a main beam and a middle main bear inside the net strutting system; the ground supporting system is installed under the middle beam and the middle main beam inside the net strutting system and provides support for the whole device; and through pin connection, two ends of the power and turning system are connected to the main beam and the middle main beam inside the net strutting system respectively. Further, the robot disclosed by the invention is small in size and compact in structure, has functions of realizing multi-anchor-rod coordinated operations and auxiliary pavement of an anchor net and has high anchoring efficiency; and the device adopts a step-type advancing mode, so that running is steady, turning is flexible and maneuvering performance is good.
Owner:ANHUI UNIV OF SCI & TECH
Stirring pile ship used for underwater soft foundation construction
ActiveCN104846813AHigh working reliabilityIncrease job securityWaterborne vesselsBulkheads/pilesMarine engineeringWater flow
The invention discloses a stirring pile ship used for underwater soft foundation construction. The stirring pile ship comprises a double-body ship, a hollow construction work area is arranged between the front end and the tail end of the double-body ship, a longitudinal movement trolley capable of moving in the longitudinal direction of the construction work area is arranged on two ship bodies of the double-body ship, and a transverse movement trolley capable of moving in the transverse direction of the construction work area is arranged on the longitudinal movement trolley. The transverse movement trolley is provided with a stirring device used for working on an underwater soft foundation located below the construction work area. The stirring pile ship has the advantages that the draft and stranding work construction can be conducted in the various conditions with soil, with ebb water flow and without ebb water flow by means of the double-body ship, high bearing and storing buoyancy is achieved, and reliable work stability and adaptability are achieved; a construction device can be used for conducting construction work on the underwater soft foundation needing to be constructed at any time by moving the longitudinal movement trolley and the transverse movement trolley, the work area is large, and therefore the working efficiency is effectively improved.
Owner:ZHEJIANG RECLAIM NINGBO HONGYANG CONSTR
A mixing pile ship for underwater soft foundation construction
ActiveCN104846813BHigh working reliabilityIncrease job securityWaterborne vesselsBulkheads/pilesMarine engineeringWater flow
The invention discloses a stirring pile ship used for underwater soft foundation construction. The stirring pile ship comprises a double-body ship, a hollow construction work area is arranged between the front end and the tail end of the double-body ship, a longitudinal movement trolley capable of moving in the longitudinal direction of the construction work area is arranged on two ship bodies of the double-body ship, and a transverse movement trolley capable of moving in the transverse direction of the construction work area is arranged on the longitudinal movement trolley. The transverse movement trolley is provided with a stirring device used for working on an underwater soft foundation located below the construction work area. The stirring pile ship has the advantages that the draft and stranding work construction can be conducted in the various conditions with soil, with ebb water flow and without ebb water flow by means of the double-body ship, high bearing and storing buoyancy is achieved, and reliable work stability and adaptability are achieved; a construction device can be used for conducting construction work on the underwater soft foundation needing to be constructed at any time by moving the longitudinal movement trolley and the transverse movement trolley, the work area is large, and therefore the working efficiency is effectively improved.
Owner:ZHEJIANG RECLAIM NINGBO HONGYANG CONSTR
Casting technology of rare earth alloy brake disc casting for high speed railway passenger train
ActiveCN107671228AReduce oxidationExpand the operating areaFoundry mouldsFoundry coresRare earthAlloy
The invention relates to a rare earth alloy brake disc casting for a high speed railway passenger train, in particular to a casting technology of the rare earth alloy brake disc casting for the high speed railway passenger train. The casting technology mainly includes the steps that the purity of original molten steel is strictly controlled, alloying treatment is conducted on molten steel by usinghigh-purity rare earth alloy or rare earth iron alloy, full zircon sand modeling is used, and the brake disc casting is poured smoothly. By means of a smelting and pouring method of the casting technology, the casting is homogeneous and refined in structure, inclusions are reduced, and the impact toughness and fatigue resistance of a brake disc material are improved, so that the high speed railway passenger train runs more safely and stably.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Novel notebook computer
ActiveCN109799878ANovel structureSwitch freelyDigital data processing detailsWork patternEngineering
Provided is a novel notebook computer comprising a first body, the screen unit is mounted above the first body in an elastic turnover manner; the second body is pivotally mounted on one side of the first body through a first rotating shaft; the third body is pivotally mounted on the other side of the first body through a second rotating shaft; the screen unit is overlapped on the first body through the locking part; wherein the second body and the third body are respectively overlapped above the screen unit, a driving part is arranged on the second body and / or the third body, and when the second body and the third body are turned over and opened, the driving part acts on the locking part so as to enable the screen unit to be elastically turned over from the first body. The scheme is novelin structure, can be divided into a working mode and a cinema mode, and can be freely switched; The structure is relatively open, and the main board can be designed at places where the left and rightswing covers are not commonly used to easily dissipate heat; And when the computer is turned off, the interface is relatively closed to reduce dust entering the machine.
Owner:SAMSUNG ELECTRONICS SUZHOU COMP +1
Impeller without hydraulic head hump
ActiveCN103883557AReduce refluxImprove operational reliabilityPump componentsPumpsImpellerArray data structure
The invention relates to impellers of vane pumps, in particular to an impeller without hydraulic head humps and solves the problem of instability in operation of a pump set resulted from hydraulic head humps of an existing impeller. The impeller comprises vane front and rear cover plates, a hub and a plurality of groups of vanes uniformly distributed between the vane front and rear cover plates, the vanes, the vane front cover plate and the vane rear cover plate are connected integrally, the vanes rotate through a shaft connected with the hub, fluid passages are reserved among the vanes, and fluid enters from vane inlet sides along an operation face to flow to vane outlet sides. Edges, close to the vane front cover plate, of inlet sides of each group of vanes are in forward triangular structures. Inlet angles, at distances 0.6-1.0 time of lengths of the inlet sides by taking intersection points of the vane rear cover plate and the vane inlet sides as starting points, of each group of vanes are smaller than 5 degrees. Impeller streamline length at the vane front cover plate is increased, inlet backflow of a small-flow area of a vane pump can be reduced, energy loss caused by air vortexes is avoided, flow hydraulic head humps are avoided, and stability in operation of the pump set is improved.
Owner:KSB SHANGHAI PUMP
Mobile-communication networking method and system
InactiveCN106792691AImprove robustnessReduce communication delaySecurity arrangementNetwork planningEmbedded systemBase station
The invention discloses a mobile-communication networking method and a mobile-communication networking system. The mobile-communication networking method comprises the following steps: acquiring data packages generated by base-station equipment or uplink transmitted by first terminal equipment residing in the current sub-network; judging the target equipment of the data packages whether belongs to the current sub-network or not,if not, then transmitting the data packages until the data packages are authenticated and accessed to the trunk equipment of the current sub-network so that the trunk equipment downlink transmits the data packages to the target equipment through the adjoining second sub-network operating authentication and access with the trunk equipment at the same time. The mobile-communication networking method can effectively improve the communication efficiency of the terminal equipment of the networking system.
Owner:COMBA TELECOM SYST CHINA LTD
Internal combustion engine and method for controlling same
ActiveCN108431388AAvoid hibernationAvoid stockpilingValve arrangementsElectrical controlCombustionInternal combustion engine
The present invention is equipped with a control device (40) for adjusting a fuel injection valve (12) and a resting mechanism (30), and performing a control for switching between: all-cylinder operation (Oa), during which the combustion cycle is always underway in all cylinders 11; and reduced-cylinder operation (Or), during which the combustion cycle is always underway in a number of cylinders (11) that is less than a cylinder number (Nc). Therein, the reduced-cylinder operation (Or) involves performing a partial operation during which all cylinders (11) repeatedly alternate between an operating state and a resting state.
Owner:ISUZU MOTORS LTD
Angle-adjustable spraying and dust-settling device for coal mine
InactiveCN113622986AEasy to useEasy to moveDust removalFire preventionReciprocating motionElectric machine
The invention relates to an angle-adjustable spraying and dust-settling device for a coal mine. The angle-adjustable spraying and dust-settling device comprises a bottom plate, rolling wheels rotationally installed at the bottom of the bottom plate, a water tank arranged on the bottom plate, a water pump arranged on the water tank, a hose arranged on a water outlet of the water pump, a first explosion-proof motor fixedly installed on the upper surface of the bottom plate and a positioning rod vertically installed on the first explosion-proof motor, wherein a water inlet pipe of the water pump extends into the water tank, the output end of the first explosion-proof motor faces upwards and is coaxially provided with a threaded rod, the threaded rod is in threaded fit with a horizontally-arranged moving table, and the hose extends to be supported above the moving table and a movable arm and is connected with the movable arm. According to the angle-adjustable spraying and dust-settling device for the coal mine, the movable table is driven by the first explosion-proof motor to reciprocate up and down along the threaded rod so as to adjust the height of an atomizing cover connected with the hose, and the movable arm is driven by a second explosion-proof motor to swing back and forth in a transverse sector type mode so as to enlarge the spraying operation area of the atomizing cover.
Owner:XISHAN COAL ELECTRICITY GRP
Method for designing stabilizer of an uncertain power system based on interval time lag influence
ActiveCN112186780ATake advantage ofFully considerPower oscillations reduction/preventionRobustificationFeedback controller
The invention relates to a method for designing a stabilizer of an uncertain power system based on interval time lag influence, which comprises the following steps of: constructing a new augmentationvector and a multiple integral LyapunovKrasovskii functional, then introducing a double Wirtinger inequality to estimate a functional derivative on the basis of a single Wirtinger integral inequality,and adopting a convex combination method, so that a system robustness stability criterion with lower conservative property is obtained. On the basis, a memory-free and memory feedback controller of the system is designed, and a step linearization method is applied to obtain a stabilizer existence condition based on a strict linear matrix inequality. Finally, simulation analysis verifies that themethod provided by the invention effectively enlarges the stable operation region of the power system, and the designed controller has better control performance.
Owner:HENAN POLYTECHNIC UNIV
Automatic intelligent grease sprayer
PendingCN107442314AAchieve anti-corrosion and anti-rustEfficient sprayingLiquid spraying apparatusElectricityControl system
The invention discloses an automatic intelligent grease sprayer, and belongs to the field of rail maintenance devices. The automatic intelligent grease sprayer is used for maintaining rail station plugs, and comprises a frame base, wherein an oil inlet of a plunger pump is connected with a grease tank, an oil outlet of the plunger pump is connected with at least one grease nozzle, and power is provided for the plunger pump through a pump driving mechanism; and a control system comprises a controller and a sensor, the sensor is arranged at a position for sensing a station plug on the frame base and is connected with the controller through a lead in a way of electric signals, and the controller is also connected with a travelling mechanism assembly and a control device in the pump driving mechanism through leads in a way of electric signals. The automatic intelligent grease sprayer can achieve precise spraying at station plug positions of a steel rail, is simple in structure, high in working efficiency and strong in stability, does not need doping of machine oil, and can spray long-acting grease; and the anticorrosion time of station plugs is long, so that the steel rail maintenance cost is reduced.
Owner:山东华盛中天工程机械有限责任公司
Impeller without hump
ActiveCN103883557BReduce refluxImprove operational reliabilityPump componentsPumpsImpellerWorking fluid
An impeller with a head without a hump, which relates to the impeller of a vane pump, which solves the problem of unstable operation of a pump set caused by a hump in the head of an existing impeller. A group of blades, the blades are integrally connected with the blade front cover plate and the blade rear cover plate, the blades rotate through the shaft connected to the hub, and there are fluid channels between the blades, and the fluid flows along the working surface from the blade inlet side to the blade outlet side, wherein : The outer edge of the inlet edge of each group of blades adopts a forward triangular structure near the front cover of the blade; each group of blades starts from the intersection point of the rear cover of the blade and the inlet edge of the blade, and at a distance of 0.6-1.0 times the length of the inlet edge, The angle of the inlet angle is less than 5 degrees. The impeller increases the length of the impeller streamline at the front cover of the blade, which can reduce the inlet return flow of the small flow area of the vane pump, avoid the generation of vortex and energy loss, and the flow head will not produce a hump, which increases the stability of the pump operation.
Owner:KSB SHANGHAI PUMP
A drone relay measurement method
ActiveCN108768494BExpand the operating areaMaximize inspection efficiencyAssess restrictionParticular environment based servicesSimulationUncrewed vehicle
The invention provides a method for unmanned aerial vehicle relay measurement and control, comprising the following steps: S1. Establishing multiple ground stations, extending the measurement and control range by means of ground station networking, and performing dynamic network access authentication with a unique address identification for the measurement and control airborne equipment ; S2. UAV switches among multiple ground stations, and selects a suitable ground station; S3. Classifies UAV data, and uses different transmission methods for different classification data to transmit to the command center. In the UAV relay measurement and control method described in the present invention, multiple ground stations are networked on the ground to realize uninterrupted handover of UAV control rights, and the command center can continuously monitor the status and video of the UAV; When the drone's range capability exceeds the measurement and control range of a single ground station, the drone's operating area will be expanded, and the random network connection and withdrawal of airborne equipment will be realized to maximize the efficiency of drone inspections.
Owner:TIANJIN AEROSPACE ZHONGWEI DATA SYST TECH CO LTD
A static pressure pile boat for inserting plastic drainage boards
ActiveCN107237328BExpand the operating areaIncrease insertion efficiencyWaterborne vesselsSpecial purpose vesselsSoil characteristicsArchitectural engineering
The invention discloses a static pressure pile ship for installing a plastic drain board by insertion. The static pressure pile ship comprises a catamaran, and a hollow construction area is provided between the bow and stern of the catamaran; and the catamaran is provided with a static pressure operating system used for conveying, arranging and cutting out a drain board, and a mobile device used for driving the static pressure operating system to move back and forth in the construction area, and the mobile device is used for driving the static pressure operating system for constructing different positions in the construction area. The static pressure pile ship for installing the plastic drain board by insertion has the advantages of high working reliability, safety, insertion efficiency, construction quality and adaptability, environmental protection and no noise, and the practical construction requirements can be met under the conditions of different soils with or without falling tide water flow; and the plastic drain board is inserted into the soil with a static pressure construction method for drainage, consolidation and improvement of the soil characteristics, and the bearing capacity of a soft foundation is improved, so that the soft function soil is formed into consolidated soil with certain strength.
Owner:ZHEJIANG RECLAIM NINGBO HONGYANG CONSTR
A method for improving torque output capability of AC motors based on improved overmodulation
ActiveCN104917438BIncrease torqueQuick responseElectronic commutation motor controlAC motor controlVoltage vectorSwitching signal
The invention relates to a method for improving the torque output capability of an AC motor based on improved overmodulation, comprising: a current PI regulator outputs dq-axis voltage vectors Ud and Uq according to id*, iq*, id, and iq; In the field-weakening area, Ud and Uq obtain the αβ-axis voltage vectors Uα and Uβ after coordinate transformation. When the AC motor runs in the field-weakening area, Ud and Uq obtain the dq-axis optimized voltage vectors Udn and Uqn through the voltage optimization method. Udn and Uqn are obtained by After coordinate transformation, Uα and Uβ are obtained; according to the size of Uα and Uβ, it is divided into different modulation areas, and the corrected dq axis voltage vectors Ud* and Uq* are output by Uα and Uβ; finally, space voltage vector modulation is performed to generate switching action signals to control On and off of the IGBT in the inverter. Compared with the prior art, the invention has the advantages of high bus voltage utilization rate, large output torque boost, fast current response speed and the like.
Owner:TONGJI UNIV
Conveying type digging machine without blocking chain
The invention provides a conveying type digging machine without a blocking chain. A lower suspension frame, an upper suspension frame and a gearbox are mounted on a frame, and a stone removing main belt wheel and a stone removing plate gear are mounted on a conveying blade gear shaft. A conveying main belt wheel and a conveying blade gear are mounted on a stone removing plate gear shaft, and a direction changing main gear is connected with a direction changing main gear shaft. A stone removing plate is connected with a stone removing plate hub, a stone removing plate shaft is connected with the frame, and the stone removing plate hub is connected with the stone removing plate shaft. A conveying blade hub is connected with a conveying blade shaft, the conveying blade shaft is connected with the frame, and conveying blades are connected with the conveying blade hub. A conveying blade conveying belt is connected with the conveying main belt wheel and a conveying driven belt wheel, and a stone removing transmission belt is connected with the stone removing main belt wheel and a stone removing belt wheel. The operating area of a harvester is enlarged, the operating efficiency and quality of the harvester are improved, and actual production requirements can be effectively met.
Owner:郝玲
Auxiliary turning device for turning-throwing machine
ActiveCN103694013BEasy to operateExpand the operating areaBio-organic fraction processingOrganic fertiliser preparationEngineeringOrganic glass
The invention relates to an auxiliary turning device for a turning-throwing machine. The auxiliary turning device comprises connecting pieces (1) arranged on the left and right sides, wherein the connecting pieces (1) comprise connecting plates (1.1); arc-shaped mounting plates (1.2) are arranged on the upper parts of the connecting plates (1.1); mounting plates (1.3) are arranged on the lower parts of the connecting plates (1.1); a turning plate (2) is connected between the mounting plates (1.3) of the connecting pieces (1) arranged on the left and right sides; the turning plate (2) is in an L shape; a fragile strip (3) is arranged on a downwards side plate of the L-shaped turning plate (2); the fragile strip (3) is made of organic glass or plastics. According to the auxiliary turning device for the turning-throwing machine, a turning-throwing operation area of the turning-throwing machine is improved.
Owner:JIANGYIN LIANYE BIOTECHOLOGY
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