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233results about How to "Avoid affecting measurement accuracy" patented technology
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Multifunctional high-accuracy hardened concrete test-piece treatment machine
ActiveCN103344452AAvoid runningReduce pollutionWithdrawing sample devicesPreparing sample for investigationElectric machineryStructural engineering
The invention discloses a multifunctional high-accuracy hardened concrete test-piece treatment machine. The multifunctional and high-accuracy hardened concrete test-piece treatment machine comprises a rack, a motor, a speed changing box, a rotating shaft, a drilling bit, a test-piece clamping device, a test-piece horizontal movement mechanism and a vertical lifting mechanism, wherein the rotating shaft is driven by the motor and the speed changing box; the drilling bit is fixed at the free end of the rotating shaft; the vertical lifting mechanism acts on the rotating shaft to enable the rotating shaft to rise and fall in the vertical direction; a test piece is fixed on the test-piece horizontal mvoement mechanism by the test-piece clamping device; the test-piece horizontal movement mechanism can move along the forward-rearward-leftward-rightward directions on the horizontal plane. The multifunctional high-accuracy hardened concrete test-piece treatment machine disclosed by the invention has the advantages that the treatment problems of grinding, core drilling, hole drilling, end-surface abrading and the like before the test are solved; the multifunctional high-accuracy hardened concrete test-piece treatment machine integrates multiple concrete test piece treatment functions, is high in working efficiency and high in processing accuracy, and is used for carrying out various performance tests on the hardened concrete test piece.
Owner:CCCC FOURTH HARBOR ENG INST +3
Laser radar coaxial optical system and laser radar
The invention relates to the technical field of artificial intelligence, and in particular relates to a laser radar coaxial optical system. The laser radar optical system comprises a transmitting optical unit and a receiving optical unit; the transmitting optical unit comprises a laser, a collimating lens and an MEMS galvanometer; the receiving optical unit comprises a receiving lens and an aperture reflector, wherein the collimating lens, the aperture reflector and the MEMS galvanometer are sequentially arranged on the subsequent optical path of the light beam transmitted by the laser; afterbeing collimated through the collimating lens, the light beam transmitted by the laser passes through the small hole of the aperture reflector, and enters the MEMS galvanometer; the MEMS galvanometerdeflects and reflects incidence laser onto a target object; and reflected light of the target object is reflected through the MEMS galvanometer, and enters the receiving optical unit. According to thelaser radar coaxial optical system and the laser radar in the invention, coaxial optical path design is adopted; transmitting and receiving optical paths are combined through the aperture reflector;exit laser is scanned from the combined laser through the MEMS galvanometer; the laser radar optical system is convenient to debug; furthermore, due to beam combination, optical signal loss is low; and the detection distance is greatly increased.
Owner:BENEWAKE BEIJING TECH CO LTD
A laser radar system
ActiveCN109917348BGuaranteed exit efficiencyCollimation is effectiveWave based measurement systemsRadar systemsLight beam
The present invention provides a laser radar system, comprising a transmitting module and a scanning module sequentially arranged along a first optical path. The transmitting module comprises a laser transmitting unit and a telecentric lens assembly. The laser transmitting unit comprises a plurality of light sources for transmitting a plurality of laser beams. The telecentric lens assembly is used for respectively collimating each of the plurality of laser beams into parallel beams, and enabling the plurality of parallel beams to be converged along the first optical path and to be incident to the scanning module. The scanning module is used for reflecting the converged parallel beams to a three-dimensional space, and receiving and reflecting an echo beam reflected by a target to be detected. According to the laser radar system of the present invention, laser beams emitted at different angles can be guaranteed to be efficiently collimated and emitted, the emergence efficiency of laser is guaranteed to the maximum extent, and some of laser beams transmitted by the plurality of light sources are protected from being scattered outside the scanning module to form the stray light in the operation process of the laser radar system.
Owner:HESAI TECH CO LTD
System for measuring the image quality of an optical imaging system
InactiveUS7796274B2Avoid affecting measurement accuracyImprove the immunityRadiation pyrometryUsing optical meansImaging qualityOptical measurements
A measuring system (100) for the optical measurement of an optical imaging system (150), which is provided to image a pattern arranged in an object surface (155) of the imaging system in an image surface (156) of the imaging system, comprises an object-side structure carrier (110) having an object-side measuring structure (111), to be arranged on the object side of the imaging system; an image-side structure carrier (120) having an image-side measuring structure (121), to be arranged on the image side of the imaging system; the object-side measuring structure and the image-side measuring structure being matched to each other in such a way that, when the object-side measuring structure is imaged onto the image-side measuring structure with the aid of the imaging system, a superposition pattern is produced; and a detector (130) for the locally resolving acquisition of the superposition pattern. The imaging system is designed as an immersion system for imaging with the aid of an immersion liquid (171). A structure carrier to be arranged in the region of the immersion liquid is assigned a protective system (125) in order to increase the resistance of the measuring structure to degradation caused by the immersion liquid. A measurement of immersion systems under immersion conditions is thereby possible without detrimental influence of the immersion liquid on the measuring accuracy.
Owner:CARL ZEISS SMT GMBH
Laser radar system
ActiveCN109917348AGuaranteed exit efficiencyCollimation is effectiveWave based measurement systemsRadar systemsThree-dimensional space
The invention provides a laser radar system which comprises a transmitting module and a scanning module which are sequentially arranged along a first optical path. The transmitting module comprises alaser transmitting unit and a telecentric lens group; wherein the laser transmitting unit is provided with a plurality of light sources and is used for emitting a plurality of laser beams; the telecentric lens group is used for respectively collimating the laser beams into parallel light beams and enabling the plurality of parallel light beams to be converged along a first light path and transmitted to the scanning module; and the scanning module is used for reflecting the converged parallel light beams to a three-dimensional space and receiving and reflecting echo light beams reflected by a to-be-detected target. The laser radar system can ensure that laser beams emitted at different angles are effectively collimated and emitted, the laser emitting efficiency is ensured to the maximum extent, and the situation that in the working process of the laser radar system, laser beams emitted by a plurality of light sources are partially scattered outside a scanning module to form stray lightcan be avoided.
Owner:HESAI TECH CO LTD
Foundation pit excavation model test device used in complicated groundwater environment
ActiveCN105716960AAvoid starvationAvoid problemsMaterial strength using tensile/compressive forcesConfined waterPore water pressure
The invention discloses a foundation pit excavation model test device used in the complicated groundwater environment. The foundation pit excavation model test device comprises a model box, a water tank, symmetry-plane soil retaining units, a foundation pit supporting structure, a pressure-bearing empty space, a confined water pressure adjusting system and a measuring system, wherein the water tank is arranged at the upper right part inside the model box; the symmetry-plane soil retaining units are fixed on the model box; the pressure-bearing empty space is arranged at the bottom of the model box; the confined water pressure adjusting system comprises a miniature water pressure transmitter, an organic glass cylinder device and a flowmeter. According to the foundation pit excavation model test device, dynamic change of water table level and confined water pressure in a foundation pit excavation process can be simulated; water-soil pressure and deformation of a foundation pit under the action of dynamically changed water table level and confined water pressure are measured, related test data are disposed, the issues about foundation pit stress, deformation development rules and the like are determined, effective test data support is provided for research of foundation pit problems caused by complicated groundwater environment such as the dynamic change of the water table level and the confined water pressure and the like, and the basis is provided for a later theoretical analysis model.
Owner:ZHEJIANG UNIV
FPGA-based high precision time interval measurement method and system
InactiveCN110442012AHigh measurement accuracyReduces the probability of flipping noise and metastable phenomenaElectric unknown time interval measurementTime delaysPhysics
The invention relates to an FPGA-based high precision time interval measurement method. The method comprises the following steps: performing rough measurement on the time intervals between two pulsesby adopting a pulse filling counting method to obtain a rough measurement result of the time interval; based on an FPGA tap delay chain, performing fine measurement on a phase difference less than a clock cycle to obtain a fine measurement result of the time interval; and determining a final measurement result of the time interval according to the rough measurement result and the fine measurementresult. According to the method, a wide range of time intervals can be measured by combining the rough measurement and the fine measurement and utilizing the high precision time delay interval of tensof picoseconds of an FPGA delay unit. The invention also discloses an FPGA-based high precision time interval measurement system.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Concrete material high temperature splitting testing machine, and high temperature splitting testing method
ActiveCN105403467ASolve the deformationSimple structureMaterial strength using tensile/compressive forcesFire - disastersHot Temperature
The invention provides a concrete material high temperature splitting testing machine, and a high temperature splitting testing method. The concrete material high temperature splitting testing machine comprises a loading device used for applying pressure on concrete test pieces, a heating device used for heating the concrete test pieces, and a displacement acquisition device used for measuring splitting deformation of the concrete test pieces. In concrete experiments, artful combination of the heating device and the loading device is realized, and the displacement acquisition device is also used, so that a comprehensive test system which can be used for concrete test piece high temperature splitting testing is formed, synchronous heating and loading is realized, and realistic simulation of the environment of concrete at fire disaster high temperature can be realized; and the results of concrete material tests using the concrete material high temperature splitting testing machine are extremely close to the results of the practical splitting performance of concrete at fire disaster high temperature, so that guarantees are provided for study on high temperature and fire-resistant performance of concrete materials.
Owner:ZHENGZHOU UNIV
Taper position gauge for accurately measuring big end diameter error of taper hole
The invention discloses a taper position gauge for accurately measuring a big end diameter error of a taper hole. The gauge comprises a dial gage, a gage setting piece, a measurement rod, a gauge lower body, a gauge upper body, a spring and a tightening screw, wherein the measurement rod is movably mounted in the gauge lower body; the upper part of the gauge lower body is connected with the gauge upper body for mounting the dial gage; the top end of the measurement rod is contacted with a contact of the dial gage; the gauge upper body is internally equipped with the spring for supplying elastic force to the measurement rod; and a measurement head matched with the to-be-measured taper hole is mounted at the lower part of the measurement rod. According to the gauge, with the adoption of the dial gage and the gage setting piece, a base plane distance can be measured accurately; the qualification of a part can be judged accurately; and the gauge is quick and convenient in measurement, and high in reliability.
Owner:HEBEI HUABEI DIESEL ENGINE
Capillary rheometer and method for measuring rheological properties of polymer materials
ActiveCN102507383AEliminate biasImprove comparabilityDirect flow property measurementCapillary channelEngineering
The invention discloses a capillary rheometer and a method for measuring rheological properties of polymer materials. The capillary rheometer comprises a charging barrel, wherein the front end of the charging barrel is provided with a feed port, and the rear end of the charging barrel is provided with a discharging port. A first capillary channel, a material flowing pipeline and a second capillary channel are arranged in the charging barrel, and the feed port is communicated with the discharging port sequentially through the first capillary channel, the material flowing pipeline and the second capillary channel. The cross-sectional area of the material flowing pipeline is larger than that of the first capillary channel and the second capillary channel. The method can simultaneously measure shearing rheological parameters and extensional rheological parameters of the polymer materials. During measuring polymer composite materials, the method can avoid the influence of artificial factors, reduce the errors in measurement for several times, and increase the accuracy of measurement.
Owner:SOUTH CHINA UNIV OF TECH
Undisturbed soil scouring test system
InactiveCN105021485APrevent disturbing the soil sampleImprove test accuracyInvestigating abrasion/wear resistanceInlet valveWater flow
A disclosed undisturbed soil scouring test system comprises a water pump, a water inlet pipe, a flow valve, a water inlet valve, a rectangular pipe, a water outlet pipe, two piezometric pipes, a pushing system, a pressure-regulating valve and a secondary settling basin; the water inlet of the water inlet pipe is connected with the water pump, the water outlet of the water inlet pipe is connected with the water inlet of the rectangular pipe, the water outlet of the rectangular pipe is connected with the water inlet of the water outlet pipe, and the water outlet of the water outlet pipe is connected with the secondary settling basin; the flow valve is disposed at the water inlet end of the water inlet pipe, and the water inlet valve is disposed on the water inlet pipe and at the downstream of the flow valve; the pushing system is communicated with the bottom of the rectangular pipe; the two piezometric pipes are disposed on the rectangular pipe and respectively at two sides of the pushing system; and the pressure-regulating valve is disposed at the water outlet end of the water outlet pipe. The undisturbed soil scouring test system is capable of generating a high-speed water flow for scouring undisturbed soil, and is applicable to research on incipient velocity of sediment in different particle sizes from sand grain to clay particle and undisturbed soil scouring rate tests.
Owner:HOHAI UNIV
Optical fiber frequency domain interferometry ranging system and method based on DFB array swept light source
ActiveCN109029271AAvoid affecting measurement accuracyWide sweep rangeUsing optical meansMach–Zehnder interferometerOptical fiber coupler
The invention belongs to a laser interferometry ranging technology, and provides an optical fiber frequency domain interferometry ranging system and method based on a DFB array swept light source, inorder to improve the contrast of an interference signal to the maximum extent and realize a wide swept range and very good coherence at the same time. Swept laser generated by the DFB array swept light source firstly enters a wideband optical fiber coupler with a light splitting ratio of 20 to 80, and 20% of split light enters a referential Mach-Zehnder interferometer (MZI); 80% of other light passes through a wideband optical fiber coupler with a light splitting ratio of 10 to 90, and 10% of the light enters a reference arm in two interference arms; and 90% of other light enters a test arm, the test arm adopts a three-terminal circulator structure, the swept laser enters an optical fiber probe from the three-terminal circulator and then is emitted to the surface of a to-be-tested workpiece, the reflected light from the surface of the to-be-tested workpiece is collected by the same optical fiber probe, and then the three-terminal circulator enters a coupler for beam combination to interfere with reference light. The interferometry ranging system and method is mainly applied to the laser interferometry ranging occasions.
Owner:TIANJIN UNIV
Low-temperature resistance temperature coefficient tester
InactiveCN101021502AAvoid affecting measurement accuracyImprove sealingMaterial resistancePlatinumElectrical resistance and conductance
The invention relates to a device to test temperature coefficient of metal and alloy low-temperature resistance, especially a device to test metal and alloy resistance continuously in -196deg.C-+200deg.C. The device is composed of three parts including thermostatic part, temperature measurement and control and resistance measurement. Thermostatic part contains cold source (I), heater (II), sealing element (III), thermostatic chamber (III) and insulation course (IV) etc. temperature measurement and control contains platinum hot resistance, copper-constantan thermojunction (or platinum hot resistance) and SWP-N intelligent digital apparatus. Resistance measurement adopts double bridge and potentiometer method. The invention can realize measurement of metal and alloy resistance at any temperature in -196 deg.C-+200deg.C by using the same thermostatic container.
Owner:SINO PLATINUM METALS CO LTD
Power joint device used for exoskeleton
ActiveCN108214452AHigh lateral torqueImprove structural strengthProgramme-controlled manipulatorFriction lossPhysics
The invention relates to a power joint device. The device comprises a joint body, a power device and a measuring device; the measuring device comprises a first angular measuring device, the first angular measuring device comprises a first magnet and a first magnetic field induction circuit, the first magnet is connected with one end of a motor output shaft, and is close to a first motor cover plate, the first magnetic field induction circuit is arranged on the inner side of the first motor cover plate and is close to the first magnet, a motor rotates to drive the motor output shaft to rotate,and further drive the first magnet to rotate, and the first magnetic field induction circuit induces the rotating angle of the first magnet so as to measure the rotating angle of the motor. Through the first magnet and the first magnetic field induction circuit which are in the non-contact coupling manner, measuring of the motor rotating angle is achieved, mechanical friction losses are avoided, simpleness, lightness, thinness and low cost are achieved, compared with an existing integrated type encoder scheme, mechanical structural design complexity is greatly simplified, a magnetic field generated by the magnet is a static magnetic field, the environment interference influence is avoided, and reliability is high.
Owner:SHENZHEN CONCHIN TECH CO LTD
Supersonic wave wind-speed and wind-direction measuring apparatus and measuring method
PendingCN106645792AAvoid influenceAvoid fragileIndication/recording movementFluid speed measurementShadow effectSupersonic waves
The invention discloses a supersonic wave wind-speed and wind-direction measuring apparatus and measuring method. The apparatus comprises an installation base, supersonic wave sensors, a temperature sensor and a wind-speed and wind-direction measuring unit arranged in the installation base. The four supersonic wave sensors are divided into two groups which are disposed on the orthogonal axises of the same horizontal plane with two facing the other two in a horizontal manner. The temperature sensor is arranged on the upper surface of the installation base. The wind-speed and wind-direction measuring unit acquires the forward transmission time and the backward transmission time of the two groups of the supersonic wave sensors as well as the voltage signal inputted by the temperature sensor to obtain the actually measured data about the initial wind-speed, wind-direction and temperature. Then, a BP neural network model is established so as to obtain the corrected wind-speed and wind-direction expression. Based on the initial wind-speed, wind-direction and temperature, the corrected wind-speed and wind-direction are obtained. According to the invention, the BP neural network model is employed to correct the wind-speed and wind-direction, which eliminates the measurement errors caused by the shadow effect and obtains more accurate wind-speed and wind-direction values.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
IGBT module online monitoring method
ActiveCN106249069AAccurate aging stateAccurate judgment of aging statusEnvironmental/reliability testsPower flowComputer module
The invention provides an IGBT module online monitoring method comprising a to-be-tested IGBT module and at least one test IGBT module. The to-be-tested IGBT module and the at least one test IGBT module constitute a bridge circuit. The aging state of the to-be-tested IGBT module is tested according to the following steps: inputting a short-circuit driving voltage to the to-be-tested IGBT module and making the to-be-tested IGBT module work under saturated current, and inputting a work driving voltage to the test IGBT module to make the test IGBT module work normally; and detecting the short-circuit current value of the to-be-tested IGBT module under saturated current, and judging the aging state of the to-be-tested IGBT module according to the short-circuit current value. The aging state of an IGBT module can be monitored accurately without shutdown or disassembly, so the aging state of the IGBT module can be judged accurately, and economic loss caused by detection in a shutdown state and the influence on the accuracy of measurement caused by IGBT module damage due to disassembly are avoided effectively.
Owner:CHONGQING UNIV
Model testing device for foundation under action of dynamic pressure bearing water
ActiveCN105862933ADoes not affect the microstructureAvoid starvationFoundation testingIn situ soil foundationTransformerEngineering
Owner:ZHEJIANG UNIV
Method of measuring distance between ground force bearing points of plane and system
ActiveCN105136391AEasy to measureAccurate measurementStatic/dynamic balance measurementClassical mechanicsEngineering
The invention discloses a method of measuring a distance between ground force bearing points of a plane and a system. The plane is drawn on three weighing platforms, and positions of force applying points on the weighing platforms can be conveniently and accurately measured by adopting a torque balancing principle. The advantage that force borne by four weighing sensors on each weighing platform can be independently outputted is used, the torque balancing principle is adopted, the positions of force applying points on the weighing platforms can be conveniently and accurately measured, distances between ground force bearing points of the plane measured by the method are the positions of ground actual force applying points, the fact that the traditional length measurement tool such as a tape measure is used for measuring the connection line length of plane wheel geometric center points rather than the ground actual applying points of the plane wheels, and thus the plane gravity center measurement result is influenced can be avoided, the method provides accurate distance parameters for calculating the gravity center of the plane, and the calculated plane gravity center data can be ensured to be accurate and reliable.
Owner:中航电测仪器(西安)有限公司
Wireless sensor measurement system of self-calibration integrated circuit
InactiveCN101996480AAvoid affecting measurement accuracySimple structureMeasurement devicesTransmission systemsCalibration algorithmIntegrated circuit
The invention discloses a wireless sensor measurement system of a self-calibration integrated circuit. In the system, the output end of a phase-locked loop is connected with the input end of a power amplifier, and the output end of an amplitude detector is connected with a first data processor; the reference voltage output end of an energy converter is connected with an analog / digital (A / D) converter, the output end of the A / D converter is connected with the input end of a second data processor, and the output end of the second data processor is connected with a load modulator; and the load modulator, the energy converter and one of a pair of resonance coils are connected in parallel, and the power amplifier, the other one of the pair of resonance coils and the amplitude detection are connected in sequence, wherein the A / D converter is provided with a self-calibration circuit, and a self-calibration algorithm circuit is integrated on the first data processor. The wireless sensor measurement system has the advantage that the influences of environment variation, technical errors and the like on measurement precision are weakened.
Owner:ZHEJIANG UNIV
Settlement test method for embankment filling construction
InactiveCN101684632AEasy accessAvoid affecting measurement accuracyRoadwaysHeight/levelling measurementEngineeringSteel tube
The invention relates to a settlement test method for an embankment filling construction. In the invention, a settlement plate is laid flat; a protective cover is placed above the settlement plate; the opening on the lower part of the protective cover faces a connecting steel tube on the settlement plate; the filling height of the embankment is flush with the top part of the protective cover; if the embankment uprises, then a cushion block is placed on the top part of the protective cover repeatedly; a box staff is spanned over any section of a settlement tube after taking away the protectivecover; and the elevation of the settlement plate is measured by using a balance level. The settlement test method for embankment filling construction overcomes the defects that a conventional construction vehicle must make a round when meeting a conduit extending out of a ground surface, and that the embankment settlement cannot be measured or cannot be measured accurately caused by easily breaking or bending the conduit. In construction, the settlement tube is embedded under a marked elevation of filling so as to prevent the construction vehicle from crashing the settlement tube aslant; a deformation space is reserved, the structure is simple, operation is convenient, construction is easy, cost is low and application effect is very good.
Owner:刘汉龙
Static measuring method and device for centroid position of vehicle
ActiveCN109341951AAvoid measurement errorsHigh measurement accuracyStatic/dynamic balance measurementObservational errorMeasurement device
A static measurement method and device for the centroid position of a vehicle belong to the technical field of vehicle centroid measurement. The invention aims to solve the problem that the action point of force borne by a vehicle cannot be accurately measured in the prior art. According to the static measurement device for the centroid position of a vehicle, the lower parts of symmetrical parallelogram mechanisms are connected to a base, and the upper parts of the symmetrical parallelogram mechanisms and a measurement platform are connected by measurement platform hinges. Four wheel force measurement boards are arranged in four empty slots of the measurement platform. The wheel force measurement boards are placed on the tops of the symmetrical parallelogram mechanisms, and four force sensors are evenly distributed between the wheel force measurement boards and the symmetrical parallelogram mechanisms. A tilt angle sensor is installed on the bottom of the measurement platform. The upper end of an electric cylinder is connected with the measurement platform, and the lower end of the electric cylinder is supported by the base. The measurement platform and the base are connected by base hinges. The positions of the stress points of the wheels on the wheel force measurement boards can be calculated according to the measured values of the force sensors, and thus, the spatial coordinates of the stress points of the wheels can be obtained. The measurement error caused by the inaccurate stress positions of the wheels is avoided, and the measurement accuracy is improved.
Owner:CHANGCHUN UNIV OF SCI & TECH
Method and device of wirelessly outputting thermoelectric force signal for multi-point temperature measuring of rotator
InactiveCN102161167AAvoid affecting measurement accuracySimple signal extraction deviceAuxillary equipmentMeasurement/indication equipmentsComputer moduleElectronic switch
The invention discloses a method and a device of wirelessly outputting thermoelectric force signals for multi-point temperature measuring of a rotator. The device comprises K type thermocouples, a thermoelectric force signal acquisition and emission module, a wireless reception module and a PC, wherein the wireless reception module is connected with the PC via a wire; a plurality of K type thermocouples are respectively arranged on a rotator, the temperature of which is to be measured; the K type thermocouples are connected with multipath electronic switches via wires; the thermoelectric force signal acquisition and emission module is fixed in the center of the rotator tail or sleeved on the rotator, so that the center of gravity of the thermoelectric force signal acquisition and emission module is concentric with a rotation axis of the rotator. The PC of the invention arranges serially acquired signals into thermoelectric force signal sequence of different paths at different time points according to the number of paths, and realizes real time acquisition, output and display of multi-point temperature of the rotator, well solving the leading out problem of multiple singles under rotation state and avoiding the generation of additional thermoelectric force.
Owner:SOUTH CHINA UNIV OF TECH
Intelligent girder segment matching installation control system
ActiveCN107345388AAvoid local deformationAvoid affecting measurement accuracyBridge erection/assemblyProgramme control in sequence/logic controllersControl systemStructural engineering
The invention discloses an intelligent girder segment matching installation control system. The intelligent girder segment matching installation control system comprises an angle sensor and a central control unit, wherein the angle sensor is arranged at the front end of a girder segment to be installed and is used for collecting the data of the included angle between the girder segment to be installed and an installed girder segment; the central control unit is in communication connection with the angle sensor so as to receive the included angle data of the girder segment to be installed and convert the included angle data into altitude data xi of an installation point of the angle sensor; and the central control unit judges whether the height difference of the altitude data xi of the installation point and the theoretical installation height h1 of the girder segment to be installed at the position of the installation point is larger than 2 mm or not, and if yes, the central control unit sends a starting signal to a bridge floor crane. According to the intelligent girder segment matching installation control system, by setting the position relation between the angle sensor and the girder segment and measuring the relative included angle between the girder segments, errors caused by steel girder vibration is avoided, the procedures of the whole girder segment matching process are simplified, informationized and intelligentialized, the control precision is fundamentally guaranteed, and meanwhile the labor cost is also reduced.
Owner:CCCC SECOND HARBOR ENG
Anemorumbometer
ActiveCN104950132ASimple structureThe method is simple and reliableFluid speed measurementEngineeringElectric signal
The invention relates to an anemorumbometer which comprises a wind speed measuring part and a signal processing part, wherein the wind speed measuring part comprises a casing and a wind speed measuring mechanism; the casing comprises three parts, namely, a wind inlet drum, a wind guide drum and a wind outlet drum; the wind speed measuring mechanism comprises a rotating blade and sensors; the rotating blade comprises a blade root and blade bodies circularly and evenly distributed around the blade root; a wind inlet gap exists between every two adjacent blade bodies, and one sensor is mounted on each blade body and is a Hall element; the rotating blade is connected onto the periphery of a support rod of a support plate through the blade root in a sleeve manner and can rotate relative to the support rod; the signal processing part comprises a conditioning circuit and an operating module, electric signals transmitted by the Hall elements are conditioned and operated, and the wind speed and direction are acquired.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
Diamond tool bit parameter measurement device and diamond saw blade welding machine
ActiveCN105300298AHigh measurement accuracyStrong controllabilityUsing optical meansWelding apparatusMeasurement deviceDistance detection
The invention provides a diamond tool bit parameter measurement device and a diamond saw blade welding machine, belonging to the machine tool technology field. The invention solves the problem that the prior art has the problem of lack of measurement accuracy. A thickness measurement assembly in the diamond tool bit parameter measurement device and the thickness measurement assembly in the diamond saw blade welding machine comprise two oppositely-arranged laser distance detection sensors; the two laser distance measurement sensors are connected to a control circuit; and a workpiece to be detected can go through between the two laser distance detection sensors. The invention can dramatically improve the measurement accuracy by adopting two laser distance detection sensors. The installation plate and the rack are not connected through a floating connection structure, which simplifies the structure, guarantees the measurement accuracy and improves the measurement accuracy.
Owner:项俊俊
In-situ soil body layered settlement monitoring device and method
ActiveCN110172959ASimple structureReasonable designIn situ soil foundationWater resource assessmentDeformation monitoringEngineering
The invention discloses an in-situ soil body layered settlement monitoring device and method. The device comprises a circular base arranged on the top of an exploratory well and multiple settlement monitoring devices. Each settlement monitoring device comprises an anchoring mechanism, a settlement transmission mechanism and a settlement measuring mechanism, wherein the anchoring mechanism comprises a circular base and multiple steel nails, the settlement transmission mechanism comprises a measuring rope, a telescopic pipe and a protection pipe, and the settlement measuring mechanism comprisesa stand column, a pulley mechanism, a measuring scale and a balance weight. The method includes the following steps that firstly, the settlement measuring monitoring devices are installed; secondly, backfill consolidation is conducted; thirdly, the settlement measuring mechanisms are fixed and adjusted; and fourthly, layered settlement monitoring and data treatment are conducted. By means of the in-situ soil body layered settlement monitoring device and method, design is reasonable, the cost is low, time and labor are saved, installation is convenient, soil body deformation monitoring at different heights of an in-situ soil body is achieved, and practicability is high.
Owner:CHINA JK INST OF ENG INVESTIGATION & DESIGN +1
Method and apparatus of measuring large-sized vertical shaft throw
InactiveCN1455237AAvoid affecting measurement accuracyAvoid disadvantagesStructural/machines measurementEngineeringMeasurement precision
Owner:李正才
Radial strain measurement device for compression test at high temperature and high pressure
ActiveCN109342214AAvoid affecting measurement accuracyAvoid slight shakingMaterial strength using tensile/compressive forcesMeasurement deviceHearth
The invention discloses a radial strain measurement device for a compression test at high temperature and high pressure. The radial strain measurement device comprises a kettle body and a heating furnace, wherein the kettle body is of a cylindrical hollow tube structure, a heating-section bulge ring is arranged in the middle of the kettle body and located in the center of a hearth of the two-halfopening-closing type heating furnace; a pressure device is arranged at the upper end of the kettle body; a support device is arranged at the lower end of the kettle body; a radial measurement device is arranged in the middle of the kettle body in the horizontal direction; a sample is arranged in the middle of a cavity of the kettle body; a measurement head of the radial measurement device makes contact with the side wall of the sample; a filling hole communicated with the inner cavity of the kettle body is formed in the side wall of the kettle body above the heating-section bulge ring. The radial strain measurement device can adapt to various media and samples, can be used for tests at high temperature and high pressure, meets the requirement for measurement precision, is convenient and reliable to use and low in maintaining cost and has good effect.
Owner:INST OF GEOCHEM CHINESE ACADEMY OF SCI
Small propeller rotation speed measurement device and measurement method thereof
PendingCN109975574AHigh measurement accuracyReduced measurement accuracyDevices using optical meansElectricityLaser transmitter
The invention relates to a small propeller rotation speed measurement device and a measurement method thereof and belongs to the field of automatic detection. The measurement device comprises telescopic supporting legs, a first measurement ring which is set horizontally, a second measurement ring which is set horizontally, a laser transmitter, a laser receiver, a supporting frame and a data collection computer. The telescopic supporting legs are fixedly connected with a bottom surface of the first measurement ring. The second measurement ring is located above the first measurement ring. One end of the supporting frame is fixedly connected with the first measurement ring, and the other end is fixedly connected with the second measurement ring. The laser transmitter is fixedly connected withthe first measurement ring. The laser receiver is fixedly connected with the second measurement ring. The laser receiver and the laser transmitter are set oppositely. The data collection computer iselectrically connected with the laser receiver. The measurement device has the beneficial effects that the whole measurement device is completely independent, is integrated and is not connected with apropeller and a control system thereof, so mounting is convenient and repaid and measurement is facilitated.
Owner:GUIZHOU MINZU UNIV
Aluminum powder mixing and metering device
ActiveCN103128858APrevent precipitationAvoid stratificationSold ingredients supply apparatusProduction lineAluminium powder
The invention discloses an aluminum powder mixing and metering device which comprises a mixing system, a metering system, a pipeline system, a metering and feeding control valve, and a metering and discharging control valve. A discharging port of the mixing system is connected with a feeding port of the pipeline system. A pipeline circulating pump is connected on the pipeline system. The pipeline system is provided with an adding and discharging port and a circulating discharging port, wherein the adding and discharging port is connected to a feeding port of the metering system through the metering and feeding control valve, the circulating discharging port is connected to a returning port of the mixing system, and a discharging port of the metering system is connected to a feeding port of an aerated concrete pouring mixer through the metering and discharging control valve. The operating sequence and operating modes of the metering and feeding control valve and the metering and discharging control valve are controlled by an electrical control system of an aerated concrete production line. According to the aluminum powder mixing and metering device, aluminum powder needed for production in one shift can be supplied through one time of mixing, and therefore the operation is convenient; and moreover, aluminum paste can be automatically measured and added so that errors which are possibly caused by manual adding of the aluminum paste are avoided.
Owner:FUJIAN QUNFENG MACHINERY
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