792results about How to "Quick measurement" patented technology

The invention relates to a fuel cell test system integrated with an electrochemical alternating current impedance test function, which comprises a fuel cell stack, an air supply unit, a fuel supply unit, a cooling supply unit, a control unit, an acquisition and driving unit and an electrochemical impedance measurement system, the output ends of the air supply unit, the fuel supply unit and the cooling supply unit are connected with the fuel cell stack, the acquisition and driving unit is connected with the fuel supply unit, the control unit is connected with the acquisition and driving unit, and the electrochemical impedance measurement system is connected with the fuel cell stack and the control unit. By adopting the fuel cell test system, method and device integrated with the electrochemical alternating-current impedance test function, the processor and the computer readable storage medium, rapid measurement and impedance calculation of electrochemical impedance in a fuel cell stack test process are realized, the integration level is high, the cost is greatly reduced, the operation is simple, and the test efficiency is high. Errors caused by repeated setting of load parameters are avoided, the measurement efficiency is high, and the measurement precision is high.

The invention discloses an unmanned aerial vehicle ground-to-air conversion-based arch bridge cantilever attitude and line shape real-time monitoring method, which comprises the following steps that: after segments are assembled on the ground, a plurality of prisms which are not positioned on the same straight line and a plurality of targets which are not positioned on the same straight line are arranged on the upper surfaces of the segments; three-dimensional point clouds of the segments are constructed, and coordinates of the three-dimensional point clouds are corrected through the targets; constructing a key point set, constructing a prism coordinate system (XYZ) L0, and converting coordinates of the key point set to the prism coordinate system (XYZ) L0; when the segments are spliced in the air, whether the prisms are subjected to construction disturbance deviation or not is checked, and the spatial positions and postures of chord members and flange holes of the segments are obtained according to the prism disturbance deviation condition. According to the invention, the world coordinates of the chord member pipe orifice center and the flange hole center of the main arch segment can be accurately obtained, and the spatial position and posture of the segment can be effectively reflected.

The invention relates to the technical field of new energy grid-connected converters, in particular to a disturbance amplitude design method and device for broadband frequency coupling characteristic measurement, and the method comprises the steps: obtaining the noise amplitude distribution data and spectrum characteristic data of a measured grid-connected converter; determining measurement signal values under different frequencies according to the noise amplitude distribution data and the spectral characteristic data, and estimating a signal-to-noise ratio index of broadband frequency coupling characteristic measurement according to the measurement signal values; determining a measurement error distribution range of the broadband frequency coupling characteristic according to the signal-to-noise ratio index, and determining a measurement precision evaluation result of the broadband frequency coupling characteristic according to the measurement error distribution range; and calculating the disturbance amplitude increase multiple of the broadband frequency coupling characteristic measurement according to the measurement precision evaluation result and the expected measurement error index, and designing the disturbance amplitude of the next broadband frequency coupling characteristic measurement based on the disturbance amplitude increase multiple. Therefore, the problems of poor measurement precision, low measurement efficiency and the like in the prior art are solved.

The invention discloses an inhaul cable based on an optical fiber technology and a cable force measuring method thereof, and the method comprises the steps: obtaining the monitoring data and state data of the inhaul cable, carrying out the temperature compensation of the monitoring data, obtaining a temperature compensation wavelength, correcting the temperature compensation wavelength, obtaining a first correction wavelength, correcting the first correction wavelength, obtaining a second correction wavelength, and obtaining the cable force of the inhaul cable. Determining a first inhaul cable force according to the second correction wavelength, constructing an inhaul cable force measurement model, optimizing the inhaul cable force measurement model according to the cable force error, and inputting monitoring data and state data of a to-be-measured inhaul cable into the optimized inhaul cable force measurement model to obtain a cable force measurement result. The inhaul cable based on the optical fiber technology is installed on a structure to obtain light wave signals, the light signals are processed, the cable force of the inhaul cable is calculated, and the cable force of the inhaul cable is measured in the using process of the inhaul cable based on the optical fiber technology.

The invention relates to the technical field of clip-on ammeters, and discloses an intelligent clip-on ammeter which comprises a clip-on ammeter body, a clip-on head is rotatably connected in the clip-on ammeter body, a wrench is fixedly connected to the left side of the clip-on head, and a fixing mechanism is arranged on the periphery of the clip-on ammeter body. The clamp-type ammeter comprises a clamp-type ammeter body, a fixing mechanism is arranged at the bottom of the clamp-type ammeter body, a handheld mechanism is arranged at the rear side of the clamp-type ammeter body, a limiting mechanism is arranged at the bottom of the fixing mechanism, and the fixing mechanism comprises a fixing assembly and a pressing assembly. When the clamp-on ammeter is used, the clamp-on ammeter body is fixed under the action of the base, the fixing frame and the concave frame, and the connecting shaft is connected with the fixing sleeve, so that the clamp-on ammeter body can be lifted under the action of the supporting rod, and the clamp-on ammeter body can measure the current of a cable at a high position.

The present invention relates to a plasma thruster plume parameter multi-point measurement device and a measurement method, the multi-point measurement device comprises: a vacuum chamber; a vacuum pump unit connected to the vacuum chamber; an industrial control unit connected to the vacuum pump unit, used to provide and maintain the vacuum environment of the vacuum chamber; and a measurement unit; the measurement unit comprises: at least two three-dimensional mobile platforms arranged in the vacuum chamber; a detection structure arranged on the three-dimensional mobile platform; a collection unit connected to the detection structure and used to collect data; the detection structure adopts a Langmuir probe, an RPA probe or a Faraday probe. The present invention can improve the plasma measurement efficiency, can continuously measure the multi-point symmetry of the plume, break the limitation of the use of the Langmuir probe, and shield the error interference in the probe circuit. At the same time, the multi-point measurement device of the present invention has a simple structure, is stable and reliable, and has strong practicality.

The invention discloses a crystal defect position size metering system and metering method, and the system comprises a rotating device which is provided with a crystal; the frame body is erected above the rotating device; the first laser device is arranged on one side of the frame body, and the first laser device horizontally irradiates towards one side of the crystal; the second laser device is arranged at the upper end of the frame body, the second laser device irradiates vertically and downwards, and the second laser device moves in the X-axis direction; the third laser device is arranged on the other side of the frame body, and the third laser device horizontally irradiates towards one side of the crystal; the plano-convex cylindrical mirror is arranged on a light path, close to the first laser, between the first laser and the crystal; the circular lens is arranged between the first laser and the plano-convex cylindrical mirror; and the detector is arranged at the position of the crystal and is used for detecting scattered light of a crystal defect point. The method has the advantage of rapid measurement and calculation of crystal defect position dimensions.

The utility model discloses a tool for controlling the elevation of an induction plate of a linear motor, which comprises a cross beam and a measuring assembly, and a first positioning assembly and a second positioning assembly are respectively arranged at two ends of the cross beam, the measuring assembly comprises a sliding seat which is slidably installed on the cross beam and is used for measuring the transverse distance of the measuring points of the induction plate, and a caliper which is installed on the sliding seat and is used for measuring the vertical distance of the measuring points of the induction plate. Through the positioning assemblies arranged on the two sides of the cross beam and the measuring assembly moving on the cross beam, measurement of the transverse distance and the longitudinal distance of the measuring points of the induction plate is achieved, the high-precision requirement for height installation of the induction plate is met, the elevation control precision in the installation process of the induction plate is improved, the construction quality is improved, and the risk of construction rectification is reduced.

The invention discloses an aerosol particle size and particle shape measurement system and method. The system comprises an image acquisition module, an aerosol microscopic imaging device, a system parameter calibration module, a particulate matter acquisition module, a particle size calculation module and a particle shape calculation module. The aerosol microscopic imaging device obtains contour information of aerosol based on a transmission-type microscopic imaging method; the image acquisition module acquires an aerosol particle image through the aerosol microscopic imaging device, and draws a corresponding gray value on each pixel point of the image to obtain a complete aerosol particle image; the system parameter calibration module is used for calibrating system parameters; the particulate matter acquisition module acquires particulate matters of the aerosol particle image; the particle size calculation module calculates the aerosol particle size; the particle shape calculation module calculates the aerosol particle shape. According to the invention, the problems of small depth of field, repeated particle calculation, low calculation efficiency and the like in aerosol optical microscopic imaging are solved, and high-precision and high-efficiency measurement of the particle size and the particle shape of the aerosol is realized.

The invention relates to the technical field of measurement, and provides a water depth measurement device convenient to use, which comprises a measurement ship body, a bearing frame, a suspension frame assembly, a water depth measurement mechanism and a measurement auxiliary mechanism, a winding wheel and a first angle sensor in the length metering assembly are fixedly connected with a first transverse rotating shaft, the second driving part is in transmission connection with the first angle sensor, a gravity ball in the falling part is wound around the surface of the winding wheel through a steel wire, and the measurement auxiliary mechanism comprises a fixing assembly and a swing assembly. A longitudinal pipe in the fixing assembly is installed above the fixing shell, a balance column in the swing assembly is connected with the fixing shell, a swing arm is fixedly connected between the balance column and a second transverse rotating shaft, a threading ring is fixedly connected with the balance column, the balance column is in sliding connection with an arc-shaped guide rail, and a steel wire penetrates through the longitudinal pipe and the threading ring. The device has the advantages of being convenient to use and accurate in measurement.

The invention relates to an on-line evaluation system and an on-line evaluation method for the cold start-up capability of a fuel cell. The on-line evaluation system comprises a fuel cell stack, an on-line evaluation system and a DCDC, the on-line evaluation system specifically comprises an acquisition unit used for acquiring the voltage of a fuel cell stack and the current of a DCDC input end; the impedance spectrum measurement unit is used for carrying out impedance calculation; the impedance spectrum analysis unit is used for calculating polarization process information of impedance; the excitation signal unit is used for receiving an instruction of the impedance spectrum measurement unit and controlling the amplitude and the frequency of alternating current excitation superposed on the DCDC direct current; the storage unit internally comprises a maximum water capacity database; and the control unit is used for extracting the maximum water capacity database information, obtaining the maximum water capacity of the current state in combination with the calculated polarization process information, and further transmitting a control signal to the fuel cell stack. Compared with the prior art, the polarization process information can be acquired in real time, and the cold start capability of the fuel cell can be acquired and evaluated on line in combination with the maximum water capacity database.

The invention provides a rope tension measuring device, which comprises a base provided with a linear chute and two fixed wheels; the driving wheel is installed in the sliding groove, and the driving wheel can slide along the sliding groove; one end of the sensor is connected with the driving wheel; one end of the adapter arm is connected with the other end of the sensor; the handle is provided with an opening groove, and the opening of the opening groove is rotationally connected with the other end of the adapter arm; one end of the rocker arm is rotationally connected to the base, and the other end of the rocker arm is arranged in the open slot and rotationally connected with the open slot; meanwhile, the invention further provides a rope tension measuring method. A rope is placed between the fixed wheel and the movable wheel, when the handle is rotated, the movable wheel can slide along the sliding groove to extrude the rope until the rope is bent, the sensor measures the longitudinal pressing force of the rope, and the tension of the rope is determined based on the longitudinal pressing force of the rope.

The invention relates to the technical field of vehicle detection, and particularly discloses a vehicle overall dimension measurement method. The method comprises the following steps: 1, respectively installing a left laser radar and a right laser radar on two sides of a detection area where a vehicle runs, 2, unifying point cloud data sets collected by the left laser radar and the right laser radar to the same coordinate, and denoising the point cloud data according to a set threshold range to obtain a left point cloud data set L and a right point cloud data set R; 3, subtracting the X coordinate of the R from the X coordinate of the L to obtain the width of the vehicle; obtaining a Z coordinate value from the data set R or L to obtain the height of the vehicle; 4, detecting the time T1 and T2 of the vehicle entering and exiting the detection area through the left laser radar and the right laser radar; the photoelectric switch array measures the average speed V of the vehicle, and the vehicle length is obtained through calculation according to a formula; and 5, measuring the wheelbase of the vehicle through the photoelectric switch array. The objective of the invention is to solve the problems that three laser radars are adopted to measure the overall dimension of a vehicle, the required vehicle site is large, and the equipment cost is high.

The invention discloses an LNG (Liquefied Natural Gas) ship rudder horn subsection assembly positioning method, which comprises the following steps of: butting a middle subsection and a rudder horn subsection on a jig frame, then adjusting the rudder horn subsection from front, back, left and right directions, placing a concentricity measuring device right below a lower rudder hole after the rudder horn subsection is adjusted in place, hanging a conical plumb bob at the center of an upper rudder hole by utilizing a steel wire rope, and finally measuring the concentricity of the rudder horn subsection. Adjusting the height of an outer opening of a non-butt-joint part of the rudder horn section, and measuring the distance from the steel wire rope to the inner wall of the lower rudder hole by using a right-angle measuring ruler on the concentricity measuring device in the process, so as to ensure the vertical coplanarity of the circle center of the upper rudder hole and the circle center of the lower rudder hole; the concentricity measuring device can ensure that the conical plumb bob is always in a static state, so that the influence on the measuring precision caused by the movement of the conical plumb bob due to external interference in the measuring process can be avoided, the accuracy of measured data is ensured, and the positioning precision of rudder horn sections and the positioning precision of a rudder system are further ensured.

The invention provides a male head type D-SUB connector multi-pin error measurement method. The method comprises the following steps: establishing a D-type feature library for identifying the shape of a target male head type D-SUB connector; clustering the obtained initial point cloud to obtain a plurality of impure D-SUB point cloud clusters; sequentially calculating shape features of the impure D-SUB point cloud clusters under the two-dimensional silhouette by using an image feature invariance method, and comparing the shape features with the D-type feature library to obtain a pure D-SUB point cloud cluster closest to the target; plane fitting is carried out on the D-shaped end face and the multi-pin top end in the point cloud cluster; round hole edge points are extracted from all points in the D-shaped end face fitting plane and clustered, round hole point clouds corresponding to all pins are segmented, and 3D space circle fitting is conducted on all the round hole point clouds to obtain the circle centers of the round holes; clustering each point in the multi-pin top fitting plane, and segmenting pin point clouds corresponding to each circular hole; and calculating the space offset between the circle center of the circular hole and the mass center of the point cloud of the corresponding pin, namely the pin deflection error. The method and the device have relatively high measurement precision and efficiency.

The invention relates to the technical field of fire fighting equipment, in particular to a sampling pipe network cleaning device of an air sampling early warning system, which comprises a user side, a cloud platform side, an industrial suction and discharge device, a controller, a dust quantity analyzer and an air sampling assembly, and is characterized in that the controller is in signal connection with the dust quantity analyzer and the industrial suction and discharge device; the controller is in network connection with the cloud platform end through network data transmission, the cloud platform end is in communication connection with the user end, the industrial suction and discharge device is connected with the dust quantity analyzer through a dust suction hose, and the dust quantity analyzer is connected with the air sampling assembly through a purging valve interface. According to the invention, efficient and professional detection pipe network cleaning can be realized; the device can greatly reduce the inhalation dosage of poisonous and harmful dust by personnel in poisonous and harmful places, prevents the personnel from entering the poisonous and harmful environment in daily life, and can perform online comparison on historical data and current data to timely adjust the cleaning period of the detection pipeline.

The invention relates to the technical field of spectral measurement, in particular to a spectral confocal measurement system for a static surface profile, which comprises a shimming polychromatic light surface light source for emitting a light source beam, a surface field chromatic aberration objective lens for receiving the light source beam and irradiating light rays with different wavelengths to different depths of a measured object, light returned by the measured object is projected to the digital micro-mirror device, the digital micro-mirror device controls the dip angle change of the micro-mirror array and simulates a small hole array structure so as to regulate and control the reflection direction of the light projected by the surface view field chromatic aberration objective lens, and the surface view field hyperspectral imager receives a reflected light beam regulated and controlled by the digital micro-mirror device and transmits the reflected light beam to the digital micro-mirror device. And the reflected light beam is subjected to spectral analysis and imaging processing. According to the invention, a rapid and high-precision measurement method without physically moving the measured object is realized, the measurement speed and precision are improved, and the complexity and maintenance requirements of the system are reduced.

The invention relates to a real-time measurement method for an enthalpy value in an ablation process of a thermal protection material in an electric arc wind tunnel test, is used for a ground test of an electric arc wind tunnel thermal protection system, and belongs to the research field of ground aerodynamic thermal tests of aircrafts. The non-equilibrium temperature (rotation, rotation and electron) and the concentration of atomic nitrogen and atomic oxygen of a stagnation point area of a stagnation point model of the heat-proof material are obtained, online measurement of the local center stagnation point enthalpy value of the heat-proof material is achieved, the whole-process real-time monitoring of the material ablation process is achieved, the enthalpy value simulation range of various types of arc wind tunnels such as tubular, segmented and laminated arc wind tunnels can be covered, and the performance of the heat-proof material is improved. The method has very wide applicability; and rapid and long-time measurement of the whole ablation process of the heat-proof material can be realized, the response frequency can be up to 100Hz, and the measurement period is greater than or equal to 1h.

The invention relates to the technical field of bridge detection, and discloses bridge crack automatic detection equipment, which is characterized in that a support column is mounted above a detection instrument to ensure the stability of the detection instrument, the height of the support column is adjusted through a hydraulic rod to adapt to bridges with different heights and spans, and the operation of the equipment can be controlled through a control panel. The device box is installed on the sliding block, various detection instruments can be placed in the device box, parameters such as the length, the width and the height of a bridge are measured through the distance measuring instrument, the vibration condition of the bridge is detected through the wireless data transmission bridge vibration detector, and the position and the depth of a concrete crack are detected through the concrete crack comprehensive detector. The industrial endoscope is used for detecting the internal structure condition of the bridge, the bridge flatness detector is used for detecting the flatness of the surface of the bridge, and all detection data are checked and recorded on the control panel so as to be conveniently analyzed and processed.

A method for high-efficiency combined machining of an aspheric optical element comprises the steps that a tool clamp is manufactured according to the shape of the optical element to be machined, the lower surface of an optical element blank is ground and polished, and the optical element blank is fixed to the tool clamp; performing aspheric surface forming processing on the upper surface of the optical element blank through rough grinding and accurate grinding to obtain an aspheric surface sample piece; measuring the surface shape data of the aspheric sample piece by using a contourgraph; the surface shape data are imported into an air bag polishing machine tool, an NC code for compensation machining is obtained through calculation, a tool clamp and the aspheric surface sample piece are fixed to a transition clamp of the polishing machine tool together, and rough polishing and fine polishing are conducted on the upper surface of the aspheric surface sample piece through different air bag polishing heads; and after machining is completed, measuring the surface shape data of the aspheric surface sample piece by adopting a contourgraph, soaking the aspheric surface sample piece and the tool clamp in an acetone solution after the aspheric surface sample piece is qualified, and taking out the sample piece. The process is scientific and reasonable, the surface shape of the element can be rapidly measured, the clamping error is reduced, the machining quality and the machining efficiency are improved, and the production cost is reduced.

The invention discloses a construction drawing digital review system and method based on creativity and creativity, and relates to the technical field of construction drawing review. The system adopts an ASP.NET Core cross-platform technical system, has two deployment modes of a single body mode and a cluster mode, is realized in combination with a micro-service architecture, and comprises a client supporting various domestic browsers and instant messaging tools, performs construction drawing review whole-process management through a construction project multi-drawing joint review system, and performs construction drawing review whole-process management through the construction project multi-drawing joint review system. The application layer provides docking with a third-party system and a mobile office function, the universal module provides a cross-application sharing function, and the platform layer provides system basic service. According to the method, digital joint review of the construction drawing is realized by adopting the creative technology, the whole process of project registration, drawing uploading, suggestion book generation, signature management and the like is covered, the standardization and normalization of construction drawing review are effectively improved, and the review efficiency and accuracy are greatly improved.

The invention provides a flexible high-energy laser sensing film sensor. The flexible high-energy laser sensing film sensor comprises a sensing film and a laser high-reflection film layer on the surface of the sensing film. The sensing film is composed of a flexible substrate, an upper surface transition layer, a lower surface transition layer, an upper surface thermistor layer, a lower surface thermistor layer, an upper surface lead layer, a lower surface lead layer, an upper surface protection layer and a lower surface protection layer. The thin film type double-sided resistor array is used for monitoring the laser irradiation transient thermal effect in real time, the laser detection threshold value is increased in combination with the laser high-reflection film layer, and rapid and accurate measurement of laser irradiation parameters such as laser power density, light spot size and irradiation position can be achieved; the device solves the problem that the existing devices such as a laser power meter and a laser spot analyzer are limited in light sensing diameter and are difficult to be suitable for large-spot-size laser parameter measurement and laser sensing alarm, and has the advantages of flexibility, large area, simple structure, low cost and the like.

The invention relates to an efficient and accurate packaging box size detection mechanism which comprises a bearing and positioning mechanism and a detection mechanism. The bearing and positioning mechanism comprises a bottom plate, and two bearing plates which are distributed left and right are mounted on the bottom plate; the bearing plate is provided with two bearing areas which are distributed front and back, and the bearing plate is further provided with a positioning assembly; the positioning assembly comprises a front-back positioning assembly and a left-right positioning assembly; the positioning assembly is provided with two first push blocks and two second push blocks and is used for pushing the packaging box to the middle position of the bearing area; the detection mechanism comprises a first translation mechanism and a detection assembly; the detection assembly comprises two detection units; the first translation mechanism is used for driving the detection assembly to move, so that the two detection units are respectively located right above the bearing areas on the front sides of the two bearing plates or are respectively located right above the bearing areas on the rear sides of the two bearing plates. According to the efficient and accurate packaging box size detection mechanism, rapid and accurate measurement of the size of the packaging box can be realized, and the detection efficiency and accuracy are improved.

The invention belongs to the technical field of medical instruments, and particularly relates to esophagus-cardia pressure detection equipment. Cardia pressure measurement belongs to one part of esophagus pressure measurement, but the effect of the cardia pressure measurement is very important. The method is mainly used for evaluating the functional state of the esophagus, especially the harmony and strength of esophageal muscles. The invention discloses an esophageal-cardia pressure detection device. The esophageal-cardia pressure detection device mainly comprises a first air bag body (21), a second air bag body (22) and a pressure detection sensor module (24). According to the cardia achalasia diagnosis device, multiple groups of different types of sensors are arranged at the position of the cardia, and the cardia achalasia diagnosis device can provide more comprehensive data and analysis results for diagnosis of the cardia achalasia and the gastroesophageal reflux disease. The esophagus-cardia pressure detection process can be completed within 5-10 min through the detection device, the detection speed is high, the pressure of the esophagus and cardia can be rapidly measured, the pressure measurement time is shortened, and pain of a patient is relieved. And the practicability is high.

The utility model belongs to the field of quilt processing, and particularly relates to a household quilt production fixing device which comprises a base. Linear modules are symmetrically and fixedly installed on the side wall of the top of the base, a sewing machine is fixedly installed at the sliding ends of the two linear modules, adjusting devices are fixedly installed on the two sides, not provided with the linear modules, of the base correspondingly, fixing structures are installed on the two adjusting devices in a matched mode, and a measuring device is installed on the tops of the fixing structures in a matched mode. A seventh connecting block slides, a spring is compressed by the seventh connecting block to retract the seventh connecting block into a mounting frame, and then a second inserting block is pulled upwards to drive a fixing clamp to be taken out, so that the function of quickly replacing the fixing clamp is realized, and the problem that the fixing clamp on an existing quilting machine is usually fixedly mounted on a device through a bolt; and when the fixing clamp is damaged in use, a lot of time is needed for replacement, so that the working efficiency of the device is influenced.

The utility model discloses an air gauge for measuring blades, which belongs to the technical field of air gauges and comprises a frame, a conveying belt is arranged on the inner side of the frame, and U-shaped frames are symmetrically mounted at the top of the frame. According to the utility model, when a blade needs to be measured, the blade is limited at the top of the support through the clamping mechanism, the blade is driven to move towards the first U-shaped frame through the conveying belt, when the blade passes through the first U-shaped measuring head, the width of the blade is measured through the U-shaped measuring head and the pneumatic gauge, then the blade continues to move, and when the support moves to the toothed bar, the blade is driven to move towards the first U-shaped frame through the conveying belt. According to the pneumatic measuring instrument for measuring the blade, the toothed bar is meshed with the transmission teeth, the support drives the blade to rotate by 90 degrees, then the blade passes through the second U-shaped measuring head, the thickness of the blade is measured, the size of the blade can be rapidly measured while the blade is conveyed in and out through the pneumatic measuring instrument for measuring the blade, and the measuring efficiency of the blade is effectively improved.

The invention provides a harmonious locomotive axle box body pull rod seat measuring device, which relates to the technical field of locomotive framework detection and comprises an ejector rod positioning mechanism, a rotatable pneumatic three-jaw chuck, a laser limiting distance measuring module and a stepping lead screw module which are arranged on a bottom plate. A linear guide rail is mounted at the bottom of the ejector rod positioning mechanism, so that the ejector rod positioning mechanism linearly moves in the Y-axis direction, and the ejector rod positioning mechanism is perpendicular to the X-axis where the stepping lead screw module moves, so that the rotatable pneumatic three-jaw chuck can be accurately positioned to the center of an inner hole of the axle box; a thrust ball bearing is mounted at the bottom of the rotatable pneumatic three-jaw chuck, so that free rotation of the pneumatic three-jaw chuck is guaranteed; the laser limiting distance measuring module comprises a measuring module and an infrared limiting module. The axle box pull rod seat dimension measuring device can accurately and efficiently measure the dimension of the axle box pull rod seat.

The invention relates to the technical field of isotope detection, in particular to a hydrogen and helium isotope online analysis device based on flight time, which comprises a cavity, a laser, and a rack, an extraction electrode, a film, a slit and a detector which are arranged in the cavity, and the outside of the cavity is connected with a vacuum pump to enable the cavity to be in vacuum; the laser ionizes hydrogen and helium isotopes on the rack into hydrogen positive ions and helium positive ions by using pulse laser through an incidence window arranged on the cavity, and takes the emission time of the pulse laser as a starting time signal of the flight time detection system; hydrogen positive ions and helium positive ions are led out and accelerated to proper energy through an electric field between the rack and the extraction electrode, the hydrogen positive ions and the helium positive ions penetrate through the thin film, pass through the slit and are measured by the detector, and a stop time signal of the flight time detection system is given; a flight time spectrum is obtained by using a flight time detection system through a time amplitude conversion system, and online analysis of the hydrogen and helium isotope content is realized. The measurement is fast.

The invention relates to the technical field of medical instruments, and discloses a multifunctional integrated portable insulin injection pen which comprises a refill frame, a medicament refill is inserted and mounted in the refill frame, a connector is fixedly mounted at the bottom of the refill frame, and a needle sleeve is in threaded connection with the bottom of the connector. According to the multifunctional integrated portable insulin injection pen, through cooperation of a clamping piece and a second clamping groove and adsorption of a magnetic block, the storage box can be conveniently installed, unused needle heads can be placed, used needle heads can be contained, practicability is greatly improved, a clamping column is matched with an installation hole, a blood glucose measuring assembly can be rapidly installed, integration is achieved, and the multifunctional integrated portable insulin injection pen is convenient to use. The pen cap is matched with the refill frame and the like, repeated use of the needle head is effectively avoided, infection is prevented, limiting of the pulling plate can be relieved by pressing the fixing block, the needle head is convenient to take and place, and the situation that the pulling plate is loosened when the needle head is placed in a luggage case and the like, consequently, the unused needle head falls out and is polluted, and follow-up use is affected is prevented.