38 results about "Accuracy class" patented technology

The invention relates to a truss manipulator for loading and unloading. The truss manipulator for loading and unloading is composed of a support structure, a horizontal movement assembly, a vertical movement assembly, an automatic handgrip, and a transition connection plate between two shafts, wherein the horizontal movement assembly is fixedly installed at the top end of the support structure; the vertical movement assembly runs on the horizontal movement assembly; and the automatic handgrip is installed at the bottom end of the vertical movement assembly. According to the invention, a single-vertical-column supporting main body structure is adopted, and reinforcing ribs are designed and used for improving the strength and the rigidity of the truss main body structure; and transmission in a horizontal movement is realized in a manner of matching a V-shaped slide rail with independent gear and rack, each of the gear and the rack is provided with modulo-two oblique teeth with an accuracy class of 6, the transmission manner can greatly meet requirements on a high speed, and the transmission accuracy can be controlled to be less than 0.1mm.

The invention provides a calibration device used for error measurement of a super-high voltage transformer, comprising an admittance network consisting of a standard capacitance box and a standard conductive box, a precise voltage divider, an induction-typed shunt and a null instrument. The calibration device can be used as the error measurement device when the voltage transformer is being calibrated by the capacitance-typed voltage proportion standard, adopts the difference value measurement principle to calibrate the ratio difference and the phase difference of the voltage transformer to be tested, realizes directly reading the ratio difference and phase difference of the voltage transformer to be calibrated by the conductivity quantity and capacitance quantity of the admittance network, and can calibrate the electromagnetism-typed or capacitance-typed voltage transformer within the voltage range of 110-1000KV. When calibrating the voltage transformer used for the measurement with the accuracy class of 0.05 or above, the uncertainty introduced by the calibration device is less than or equal to 5.3*10 and when calibrating the voltage transformer used for the power with the accuracy class of 0.05 or above, the uncertainty introduced by the calibration device is less than or equal to 2.3*10.

The invention relates to a transmitting and measuring method for a sea-crossing height. The method comprises the following steps: according to the measurement accuracy class of the sea-crossing height, choosing a sea-crossing graph, and arranging a sea-crossing site; measuring the waggle quantity of an offshore platform so as to obtain a change range of a vertical angle of a total-station instrument of the platform; according to the sea-crossing distance, the measurement class and the level of the instrument, determining the survey time number of the sea-crossing height measurement and an observing and surveying group number of the vertical angle during semiobservation; according to the wobble quantity of the platform, determining the number of times of reading the vertical angle collimated once; connecting an electronic data recorder with the total-station instrument, setting parameters of the number of the times of reading the vertical angle collimated once, a time interval between the twice adjacent reading and the like, performing synchronous opposite direction observation by a triangulated height method, and automatically recording and storing observation data by the electronic data recorder; calculating and outputting an observing and surveying outcome table of the vertical angle in a standard format by using interior work software; according to observation data of the sea-crossing distance, the altitude of the vertical angle, the altitude of the instrument, the altitude of a target and the like, calculating a sea-crossing altitude difference observing and surveying value. The transmitting and measuring method disclosed by the invention is particularly suitable for transmitting and measuring the sea-crossing height of the total-station instrument of a measuring station under the condition of wobble.

The invention discloses an electric energy meter calibrating device error online evaluation method, including the following steps: (1) pre-processing basic data; (2) establishing an error evaluation model; (3) estimating errors of a calibrating device, using electric energy meter basic error experimental data as input, and using an error evaluation algorithm, to obtain calibrating device error distribution, so as to obtain statistical information of error distribution mean values and mid-values, and complete calibrating device error estimation; (4) predicting errors of the calibrating device,based on electric energy meter calibrating device error estimation history, using a time sequence prediction method to complete calibrating device error trend prediction. The method integrates large amount of basic error experimental data of low-accuracy class electric energy meters into a virtual standard electric energy meter equivalent to high accuracy level, and performs real-time online monitoring and trend prediction on errors of the electric energy meter calibrating device, and completes electric energy meter calibrating device error online evaluation, so as to improve normalization, economical efficiency, and timeliness of calibrating device error evaluation.

The invention discloses a large-diameter electronic water meter online verification method and relates to the technical field of water meter verification. The method comprises the following steps of: S1, determining the maximum allowable error value of a water meter according to the accuracy class of the water meter and the temperature of a water flow; S2, fixing an externally clamped ultrasonic flowmeter to a measured pipeline to measure an actual flow value in the pipeline; S3, measuring the actual flow values of various measurement points at the respective measurement points of the measured pipeline; S4, measuring each measurement point multiple times and taking an average flow value; and S5, obtaining a difference between the average flow value and a displayed flow value to obtain the online verification result of the large-diameter electronic water meter. In the verification process, the externally-clamped ultrasonic flowmeter measures the actual flow value in the measured pipeline, which does not affect the normal living and production water of residents and factories, and does not occupy or interrupt the normal use of the large-diameter electronic water meter, namely achieves the online verification of the large-diameter electronic water meter.

The invention discloses a PCD (pitch circle diameter) drill bit with a chip breaker groove, which comprises a shank, a cutter body and PCD blades, wherein two cooling liquid holes are formed in the axial direction of the cutter body and penetrate through the shank and the cutter body; two chip pockets are formed on the cutter body in the axial direction thereof, are oppositely symmetrical in an end-view, occupy one quadrant of circle; the two PCD blades are embedded at the front end of the cutter body as drill lips in a welding way; the vertex angle at the drill tip is 130 degrees; the relief angle at the end edge of the drill bit is 8 to 12 degrees; the angle of a chip separating groove is 10 degrees; a PCD round blade is 0.3 mm; the relief angle of the round blade is 15 degrees; a round blade of the cutter body is 0.5 mm; and a chip breaker groove which has a 15-degree front angle and the width of 1 mm is formed at the place which is 0.11 mm near the end edge of the drill bit on a PCD upper surface. When the PCD drill bit is used for cutting machining, as the end edge of the drill bit has the function of chip breaking, the original long chip can be turned into short chip to be smoothly discharged from a chip space without scratching a hole wall, so that the surface roughness of the hole can be improved, the accuracy class requirement of the hole can be easily met, a lot of machining time can be saved, and the production cost can be reduced.

The invention relates to the field of noise measuring, in particular to a method of noise measuring point arrangement. The method of determining the noise measuring point arrangement based on a mean deviation comprises the steps that a mean deviation threshold of the measuring point arrangement is obtained according to a noise measuring accuracy class; a measuring distance is determined; a measuring surface is obtained; positions and quantity of initial noise measuring points are determined according to the accuracy class and the measuring distance; a mean deviation measured value is calculated according to a noise measuring result; the mean deviation measured value and the mean deviation threshold of the measuring point arrangement are compared; measuring point arrangement completion or measuring point increase is decided; and the measuring points are rearranged until the mean deviation measured value is smaller than or equal to the threshold. The method is used for determining the noise measuring point arrangement based on the mean deviation, so that the measuring uncertainty caused by noise measuring point arrangement factors can be quantified, and can be controlled effectively; and therefore, the uncertainty of a noise sound power level measuring result can meet an uncertainty requirement specified by the corresponding accuracy class.

The invention discloses a method for calculating production capability of airplane assembly line workers. The method is used for solving the technical problem that an existing multidimensional layering production capability accounting method is low in precision. The technical scheme is that the method comprises the steps of first decomposing the assembly process to assembly work elements, calculating theoretical working hours consumed by each assembly unit in a system according to decomposing results, respectively considering three worker production capability influencing leading factors which are assembly accuracy class, learning effect and assembling strength with effectively working hours of workers as the standard, quantitatively correcting the theoretical working hours, finally solving other productivity key parameters through the effectively working hours of workers in each process, and calculating the production capability of a whole assembly line in unit time. With an assembling line for a rear fuselage of an airplane of some model as an example, according to tests, compared with a method for estimation of working hours by experience in the background art, the method improves worker effectively working hours solving precision by 15.4% and improves annual output solving precision by 8%.

The invention relates to a ship alarming method which comprises a step of providing a ship alarming system based on the traveling speed and a driver's fatigue state. The system comprises a transducer assembly, a distance measuring sensor assembly, ship speed detection equipment, control equipment and driver's fatigue state detection equipment, wherein the control equipment is connected with the transducer assembly, the distance measuring sensor assembly, the ship speed detection equipment and the driver's fatigue state detection equipment respectively; the measurement accuracy class of the transducer assembly is controlled on the basis of the ship traveling speed output by the ship speed detection equipment; whether the ship traveling speed is alarmed is determined on the basis of measurement results of the transducer assembly and the distance measuring sensor assembly; and whether the driver's fatigue state is alarmed is determined on the basis of the detection result of the driver's fatigue state detection equipment. With adoption of the ship alarming method, the ship traveling safety is improved, accidents of ship hull collision are avoided, economic loss of a ship operator is reduced, and the screw and goods on the ship are prevented from damage.

The invention discloses a mechanical thread tapper. A conical rod is arranged at one end of a clamping body; a clamping surface is formed at one end of the conical rod; a clamping hole is formed at the other end of the clamping body; a positioning sleeve is arranged in the clamping hole by a clamping sleeve; and a plurality of positioning bolts are arranged at positions on the same section of the clamping hole. The mechanical thread tapper can improve tapping efficiency; the adopted four positioning bolts can conveniently adjust the coaxiality of a screw tap; meanwhile, the positioning sleeve has a smaller volume and can be processed to higher accuracy class conveniently, so that the tapping accuracy is improved; and the high-precision positioning sleeve is also favorable for the coaxiality of the screw tap such as the coaxiality and perpendicularity with a drilling machine, so that the vibration of the screw tap at work is reduced, and the instantaneous stress of the screw tap is reduced. After the specification of the screw tap is changed, only the corresponding positioning sleeve is required to be installed. In the invention, the coaxiality and perpendicularity can ensure that the tapping torque of the screw tap is small, so a standard screw tap can be used for processing on the drilling machine, the cost is saved, and the tapping efficiency is greatly improved.

A conventional electric energy calibrator-based dynamic performance tracing method is disclosed and comprises the following steps: (1) a standard device which is 0.01 grade in accuracy class in a steady state test signal condition is chosen; (2) 0.05 grade high precision three phase standard electric energy meter without any automatic measuring range switching function is chosen as a 0.05 grade conventional electric energy calibrator; (3) in the steady state test signal condition, the 0.01 grade standard device is used for subjecting the 0.05 grade conventional electric energy calibrator to conventional calibration, and that the 0.05 grade conventional electric energy calibrator meets requirements for steady state indexes is ensured; (4) a 0.1 grade electric energy meter dynamic performance measurement device which needs to be calibrated is chosen; (5) in a dynamic test signal condition, the 0.05 grade conventional electric energy calibrator is used for calibrating dynamic performanceaccuracy indexes of electric energy meter dynamic performance measurement devices which are 0.1 grade and less than 0.1 grade in accuracy class via electric energy comparison; (6) in the dynamic testsignal condition, the calibrated electric energy meter dynamic performance measurement devices are used for calibrating the dynamic performance accuracy indexes of a detected electric energy meter.

The invention discloses an optical current measurement device. The optical current measurement device comprises a sensing head system, a dynamic calibration system, a photoelectric demodulation systemand an optical fiber splitter, wherein the sensing head system comprises one or more crystal light valve magnetic field sensors, one or more solenoids, a P1 current terminal and a P2 current terminal, wherein the two ends of each crystal light valve magnetic field sensor are connected with the optical fiber splitter through optical fibers; the dynamic calibration system is connected with a downlink optical interface of the optical fiber splitter through an optical fiber; the photoelectric demodulation system comprises a light source, a photoelectric demodulation unit and an optical cable andis connected with the optical fiber splitter through the optical cable. According to the optical current measurement device, influence of factors such as temperature, magnetic field and the like is eliminated, a current signal is amplified once by the solenoids, meanwhile, by means of differential dual-optical-path detection, external magnetic field interference is eliminated, measurement precision of an optical transformer is greatly improved, the minimum rated current capable of being measured is 0.5 A, and the accuracy class is 0.2S level.

The invention provides a planar sawing machine. The planar sawing machine comprises a first bracket, a second bracket, a third bracket, a sawing device, a steel plate and a conveying device, wherein the sawing device is arranged on the first bracket, the conveying device is arranged on the third bracket, one end of the steel plate is arranged on the second bracket, the other end of the steel plate is arranged below the conveying device on the third bracket, the steel plate is conveyed to the interior of a guider of the second bracket through a transmission wheel by the conveying device, and the sawing device which is used for sawing the steel plate is arranged at an opening of the guider; the sawing device is arranged in the direction that the sawing device and the first bracket form an angle of 90 degrees. The planar sawing machine provided by the invention is fully-automatic, the angle can be adjusted, the size is small, the yield is stable, the quality is good, particularly, the accuracy class cannot be achieved by conventional tool/instrument machining, and a machining process is low in labor intensity and is pollution-free.

The invention discloses a dual optical path ionized gas detector and a detection instrument. The detector comprises two photoionization light sources, a substrate and an electrode, wherein a through hole is formed in the substrate; light windows of the two photoionization light sources are oppositely arranged across the through hole, the inner wall of the through hole and the two photoionization light sources define an ionization chamber, and the ionization chamber is communicated with the outside by virtue of an air inlet passage and an air outlet passage; and the electrode extens into the ionization chamber. The detection instrument comprises the detector. The detector disclosed by the invention has the advantages that dual optical path design is smartly adopted, so that radiation intensity of a light source is greatly improved; receiving sectional area of the electrode is increased in a multiplying manner; detection result of the detection instrument can be improved by one measurement accuracy class, measurement response time is also greatly shortened, and response is faster; meanwhile, the detector has a self-cleaning function.