76results about How to "Easy Calibration" patented technology

The invention provides a method for regulating and controlling a hydrodynamic balance valve with a real-time load feedback function, and the method comprises the steps: collecting the strain, water level, gas, vibration and motor current data of the balance valve in real time, constructing and utilizing a comprehensive load balance model, and calculating the effective safety torque of the balance valve in real time at an edge calculation layer; a mechanical wear degradation factor is calculated based on the action history and the current variance of the locking mechanism, and the instantaneous instability risk probability is calculated in combination with the effective safety torque and the current locking torque; according to the instantaneous instability risk probability, an output mode of a locking mechanism is dynamically adjusted to execute a graded locking action; and periodically calculating a full-life-cycle health degree index, and automatically generating a maintenance or replacement work order when the full-life-cycle health degree index is lower than a preset threshold value. According to the invention, the conversion from passive alarm to active defense is realized, and the safety and operation and maintenance efficiency of the urban balance valve in rainstorm, heavy load and corrosion environments are obviously improved.

The utility model relates to the technical field of insulation board processing, especially to a high -strength insulation board anti -bending performance detection device, including frame, be provided with processing mechanism on the frame and be used for insulation board processing, processing mechanism includes: take and put subassembly, set up on the frame and be used for insulation board taking and placing, feed assembly, including the right table board of fixed right end on the top of frame, the right end inside the frame is equipped with first hydraulic cylinder, and the output of first hydraulic cylinder is fixed with base plate, and the top of four corners of base plate is all fixed with guide rod, and guide rod and right table board penetrate through sliding installation, and the top between four corners's guide rod is fixed with the supporting plate, detection component sets up on the frame and is used for insulation board bending degree detection, through the hydraulic drive four -corner guide rod realizes the steady feed of insulation board, and the cylinder controls detection component intelligent avoidance, and hydraulic loading cooperates sensor accurate measurement anti -bending performance, realizes the full -process automation from feed, taking and placing to detection, ensures the test accuracy and operation efficiency.

The invention provides a post-processing federated long-tail classifier calibration method and device based on random noise driving, and the method comprises the steps: carrying out the multi-round federated learning training between a central server and a plurality of clients, and carrying out the aggregation to obtain a pre-training global model comprising a feature extractor and a classifier; at the central server side, freezing the feature extractor, and constructing a virtual balance data set based on random noise sampling and uniform label sampling; optimizing parameters of the classifier by using the virtual balance data set and a calibration loss function to obtain a calibrated classifier; and for a to-be-classified test sample, predicting the to-be-classified test sample by using the feature extractor of the central server side and the calibrated classifier. The method is applied to an image classification task in federated learning, classifier deviation caused by long-tail distribution can be effectively calibrated under the conditions that data privacy is completely protected and no auxiliary information is needed, and the recognition performance and the overall prediction calibration degree of the model on the tail category are remarkably improved.

The invention discloses a hot water circulating pump with couplings, and relates to the field of centrifugal pumps, the hot water circulating pump comprises a base, the top surface of the base is fixedly connected with a base plate, a protective cover, a first support and a pump body, and the end face of the pump body is provided with a machine seal gland. Therefore, maintenance cost is reduced, potential safety hazards are reduced, the coaxiality calibration process is simplified, repeated measurement and adjustment of the position of the motor are not needed, time and labor are saved, coaxiality can be guaranteed, overload protection can be achieved, overload burning of the motor can be avoided, safety accidents are reduced, the operation safety of the whole hot water circulation system is improved, and the service life of the hot water circulation system is prolonged. And overload protection can be adaptively changed according to the size of the motor, so that coaxiality calibration and overload protection adjustment are synchronously carried out, secondary measurement and adjustment are not needed, and the automation degree of the device is improved while time and labor are saved.

The application relates to a navigation tool calibration method, device and storage medium for surgical navigation, and relates to the technical field of medical treatment. The method comprises the following steps: acquiring a first image, the first image being obtained by image acquisition equipment when the vertex of a navigation rod is in contact with a target positioning point on a second tracking tool; acquiring a first transformation matrix and a second transformation matrix based on the first image, the coordinates of at least three first positioning points in a first coordinate system and the coordinates of at least three second positioning points in a second coordinate system; and acquiring target coordinates of the vertex of the navigation rod in the first coordinate system based on the first transformation matrix, the second transformation matrix and the coordinates of the target positioning point in the second coordinate system. In the calibration process, an axis rotation process in the related art is avoided by introducing a tracking tool, the calibration effect of the navigation tool is improved, and the calibration efficiency is improved.

The utility model provides a punching device for metal door production, and relates to the technical field of metal door production equipment, the punching device comprises a workbench and a punching assembly, the punching assembly is arranged at the top of the workbench, an adjusting assembly is arranged on the punching assembly, and a calibration assembly is arranged on the adjusting assembly; the punching assembly comprises an upper die and a lower die, the lower die is fixedly connected to the workbench, and the upper die is arranged on the side, close to the lower die, of the workbench. The calibration assembly comprises a shell and a moving block, the shell is arranged on one side of the lower die, a sliding rod is slidably connected to the shell, by arranging the calibration assembly, one side of the metal door can extrude the pressing plate, the pressing plate pushes the sliding rod to move in the direction away from the metal door, and the sliding rod drives the moving block to slide on the shell in the direction of the sliding rod through a connecting piece; in the process, the clamp moves along with the moving block and rapidly fixes the metal door, meanwhile, it is ensured that the fixed metal door is located at the designated position, and the punching precision and the working efficiency are improved.

The invention provides an open-loop amplification compensation circuit, a compensation method and a non-contact valve positioner. The open-loop amplification compensation circuit comprises a Hall sensor; the differential amplification module is cascaded with the output end of the Hall sensor so as to generate a valve position voltage signal based on the output voltage and the compensation voltage of the Hall sensor; the compensation module is used for changing the magnitude of the output compensation voltage through two paths of control signals; the processing module is used for determining the voltage compensation amount according to the valve position voltage signal when the current environment temperature changes and the control current percentage does not change; or when the current environment temperature is changed and the control current percentage is also changed, the voltage compensation amount is determined according to the valve position voltage signals before and after the change; and the two paths of control signals are generated based on the voltage compensation amount. An open-loop compensation mode is adopted, and hysteresis of closed-loop compensation does not exist.

The utility model belongs to the technical field of cubic presses, and particularly relates to a cubic press holding-up hammer correcting block which comprises a correcting block body, a connecting block is installed on the outer wall of the correcting block body, an adjusting rod is connected to the connecting block in a threaded mode, a center plate is fixedly connected to one end of the adjusting rod, a rotating ring is fixedly connected to the outer wall of the center plate, and the rotating ring is fixedly connected to the outer wall of the center plate. A supporting plate is rotationally connected to the outer wall of the rotating ring, a connecting groove matched with the rotating ring is formed in the supporting plate, a receding groove is formed in the supporting plate, and a supporting frame is connected to the inner wall of the receding groove in a clamped mode; the position of the supporting plate can be adjusted through an adjusting rod, a connecting groove and a rotating ring, so that the device is adjusted according to the position of the jacking machine after jacking, the jacking machine is corrected, and an assembly capable of correcting the position of the jacking end after contraction is formed in cooperation with a receding groove, a threaded rod and a supporting frame; and the device can be used for conveniently correcting the jacking and retracting positions of the jacking end of the cubic press.

The utility model belongs to the technical field of sensor calibration, and particularly relates to a calibration device for a methane sensor, which comprises a shell, a support plate, a mounting plate, a control panel, a plurality of storage tanks, a support disc, an adjusting component I, an adjusting component II, a sensor connecting seat, an adjusting component III and a plurality of conveying pipes, a supporting column is fixedly installed in the shell, the supporting discs are rotatably installed on the supporting column, the multiple storage tanks are installed on the supporting discs in a clamped mode and arranged with the supporting column as the center, the supporting plate is rotatably installed in the shell, and the first adjusting assembly is arranged on the supporting plate and connected with the supporting column. The sensor connecting base is fixedly installed on the supporting plate, and the second adjusting assembly is arranged on the supporting plate and connected with the sensor connecting base. The system has the advantages of reasonable design, simple operation, high calibration efficiency, good accuracy, strong anti-interference capability, high safety and the like, and has high practical value and popularization value.

This invention discloses a multifunctional analyzer combining CL-LIBS-LA-ICP-MS, comprising a laser optical path module, an electronic excitation system, a spectral detection module, a sample chamber, and a mass spectrometry detection module. The laser optical path module includes a laser source, a beam adjustment system, a scanning galvanometer, and a coaxial microscopic observation system. The spectral detection module includes a light signal collection end, an echelle grating spectrometer, a gated camera, and a timing control module. Another aspect of this invention discloses an analytical method, comprising setting the environment to vacuum and performing CL imaging scanning; selecting a LIBS test area based on the CL imaging scan image and performing LIBS scanning; selecting a third test area based on the LIBS scan results, filling the sample chamber with carrier gas, and performing laser ablation mass spectrometry detection. This invention eliminates the positioning error caused by sample transfer between multiple instruments during combined techniques, provides more comprehensive information on the structure and composition of the sample, and further improves the detection efficiency of the entire method through two screening test ranges.

The utility model discloses a kind of chain releasing device and automatic opening door placket machine, it is related to clothing technical field, chain releasing device, including seat and zip placing plate, seat includes the fixed seat for being connected with the bottom plate of sewing machine, and the rotating seat rotatably connected in fixed seat;Zip placing plate is connected with rotating seat, and the length direction of zip placing plate is opened with the accommodating groove for placing zip in one side;When rotating seat is rotated to first angle relative to fixed seat, the length direction of zip placing plate extends along first direction and the opening of accommodating groove is upwards to be used for placing zip;When rotating seat is rotated to second angle relative to fixed seat, the length direction of zip placing plate extends along second direction and the opening of accommodating groove is downwards, which is angle setting with first direction, for sewing machine to sew zip;The cooperation of seat and zip placing plate can accurately realize the placement, inversion and subsequent sewing of zip, effectively improve the drawbacks of calibration and positioning by experience and skill.

The application discloses a creep life prediction method for a nickel-based single crystal alloy considering a primary orientation deviation angle, and comprises the following steps: S1, acquiring a primary orientation deviation angle of a sample; S2, performing a creep test on the sample to obtain creep test data; S3, establishing a creep constitutive damage equation, constructing a correlation formula of a primary orientation deviation angle influence factor and the primary orientation deviation angle, and introducing the primary orientation deviation angle influence factor into a material degradation term in the creep constitutive damage equation for correction; S4, calibrating undetermined parameters in the corrected creep constitutive damage equation by using the creep test data; and S5, establishing a finite element model of a nickel-based single crystal high-temperature alloy sample based on the calibrated creep constitutive damage equation, and calculating the creep life of the sample by using the finite element method. The application changes the influence of the primary orientation deviation on the creep life from "systematic theory coupling" to "engineering precise quantification", and is more suitable for actual engineering application requirements.

This utility model relates to a short-time self-locking protection circuit for robot joints, including a three-phase drive circuit for a motor and a short-time self-locking protection circuit. The short-time self-locking protection circuit includes capacitor C1, capacitor C2, resistor R1, diode D6, optocoupler U1, and three parallel MOSFETs Q1, Q2, and Q3. One end of capacitor C1 is connected to the negative terminal of diode D6, capacitor C2, and resistor R1; the positive terminal of diode D6 is connected to power supply Vcc_2; and the other end of capacitor C1 is connected to the other end of capacitor C2 and ground. This utility model has the following advantages: 1. Reduced cost: avoids the use of high-cost mechanical brake devices. 2. Improved reliability: reduces the use of mechanical parts, lowering the risk of failure due to mechanical wear. 3. Facilitates handling and calibration: in the event of power failure, the motor can return to a non-self-locking state after a period of time, facilitating handling and attitude calibration.

The invention discloses a cabin relative pose measurement method based on non-cooperative assembly characteristics, and the method employs a displacement sensor and a visual camera to form a double-sided measurement device, synchronously measures the assembly characteristics of a cabin, calculates and decouples the relative poses of six degrees of freedom, and provides a basis for pose adjustment assembly. According to the method, heterogeneous measurement data fusion and coordinate system unification of the displacement sensor and the visual camera are achieved, mutual decoupling and synchronous posture adjustment of six degrees of freedom can be achieved, the posture adjustment convergence rate is increased, and the assembly efficiency can be effectively improved.

The invention relates to the technical field of logging while drilling, and discloses a stratum simulation box for a lateral resistivity logging while drilling tool and a design method of the stratum simulation box. The design method comprises the following steps: determining an electrode structure of an azimuth electrode system of the lateral resistivity logging-while-drilling tool; determining a resistance network of the stratum simulation box based on an electrode structure and a working principle of the azimuth electrode system; according to the resistance network of the stratum simulation box and a working principle, determining a calculation scheme of each resistance parameter in the resistance network of the stratum simulation box; and determining each resistance value of the stratum simulation box resistance network under the typical stratum condition by utilizing a three-dimensional finite element program. The formation simulation box for the while-drilling lateral resistivity logging instrument is designed and generated through the method, various formations simulated by the formation simulation box can be measured by the while-drilling lateral resistivity logging instrument indoors, the working state of the instrument can be checked conveniently, and the instrument can be debugged, maintained and calibrated conveniently; and the time for repeatedly testing and verifying the performance of the instrument is greatly saved.

The utility model discloses an on-line thickness detection device and system. The device comprises a C-shaped arm beam, a guide roller mechanism, a lead screw transmission mechanism, a first displacement sensor assembly and a second displacement sensor assembly. The guide roller mechanism is used for rolling a to-be-detected pole piece, the first displacement sensor assembly is used for detecting a first distance of the upper surface of the rolled to-be-detected pole piece, and the second displacement sensor assembly is used for detecting a second distance of the lower surface of the rolled to-be-detected pole piece. The screw rod transmission mechanism is used for driving the C-shaped arm beam to move; the two displacement sensors are connected through the C-shaped arm beam, the upper surface distance and the lower surface distance of the to-be-detected pole piece are detected through the two displacement sensors respectively, the thickness of the to-be-detected pole piece is calculated through the distance between the displacement sensors and the upper surface and the distance between the displacement sensors and the lower surface of the to-be-detected pole piece, the structure is simple, and accuracy is high.

The utility model relates to gas detection technical field, the utility model provides a kind of portable gas calibration device, can realize portable flow adjustable, gas species selectable, configuration accurate, simple operation and safe use. The utility model device can produce five kinds of standard gas in hydrogen in air, hydrogen in oxygen, hydrogen in nitrogen, oxygen in hydrogen and oxygen in nitrogen, when producing hydrogen in air, can not use standard gas cylinder, by extracting field air after pretreatment as carrier gas to carry out gas distribution;When producing other gas, only need to be equipped with a bottle of carrier gas standard gas. The utility model gas distribution principle is simple, concentration is accurate, greatly facilitates the calibration of on-site analyzer, realizes portable flow adjustable, gas species selectable, configuration accurate, simple operation.

The application discloses a multi-agent material calculation consistency calibration method, belonging to the cross field of material science, artificial intelligence and computational physics. The method adopts a master-slave structure multi-agent system, containing one master agent and at least three slave agents. The master agent is responsible for overall coordination, embedding physical mechanism constraints, consistency calibration and output results. The method steps are: constructing a calculation system, introducing physical mechanism constraints and embedding slave agent calculation models, collecting calculation data, performing bias analysis, adjusting parameters or correcting results through iterative calibration, and finally verifying and outputting the final results. The application introduces physical mechanism constraints, combines bias analysis and iterative calibration, and solves the problems of poor consistency of existing multi-agent material calculation results and easy violation of physical laws. Experiments show that the method reduces the deviation of the calculation results and the experimental measured values to below 3%, improves the calibration efficiency by more than 40%, and improves the calculation accuracy by more than 35% compared with the prior art, thereby improving the accuracy and engineering practicability of high-throughput calculation of material performance.

The invention provides a curved-surface foam processing method. The curved-surface foam processing method comprises the following steps: S1, performing three-dimensional modeling on curved-surface foam and uniformly dividing the curved-surface foam into a plurality of small foam blocks; s2, the foam blank is clamped and fixed to a platform with a groove; s3, the foam blank is machined into small foam blocks through a three-axis machine tool; and S4, splicing and assembling the processed small foam blocks to obtain the complete curved-surface foam. The machining device has the effect of achieving high-profile-precision machining of large curved-surface foam.

The invention discloses a dual-band broadband direction finding system and method based on antenna group gating. The dual-band broadband direction finding system comprises an antenna array, a signal conversion unit, a channel gating unit, a digital processing unit and a control and interaction unit, the antenna array is used for integrally covering the first antenna group and the second antenna group based on unified geometric framework arrangement, and realizing unified output of cross-band direction finding results; the signal conversion unit is used for converting a radio frequency signal into a signal which can be processed by the digital processing unit; the channel gating unit is used for realizing configurable connection between the first antenna group or the second antenna group and a receiving channel of the digital processing unit; the digital processing unit is used for completing signal sampling, feature extraction and direction estimation operation and outputting a direction finding result; and the control and interaction unit is used for outputting parameters and results. According to the invention, the high-frequency direction-finding antenna group and the low-frequency direction-finding antenna group are respectively constructed under a unified hexagonal geometric framework, so that the system gives consideration to omnidirectional coverage, direction-finding sensitivity and engineering implementation feasibility under the condition of a wide frequency band.

The invention provides a compliance-perception integrated fingertip and a robot dexterous hand, the compliance-perception integrated fingertip comprises a proximal section rack, a middle section phalanx connecting rod and a rigid fingertip, and the proximal section rack, the middle section phalanx connecting rod and the rigid fingertip are hinged and connected in series to form a rigid connecting rod; the continuous elastic plate and the middle phalanx connecting rod are arranged in a crossed mode, and a plurality of flexible strain sensors are distributed on the surface of the continuous elastic plate. According to the compliance-perception integrated fingertip and the robot dexterous hand, a rigid and elastic mixed plane four-bar mechanism structure is adopted, the driver module drives the elastic plate to drive the four-bar mechanism to move, when no load exists, the fingertip and the finger middle joint can be linked according to a specific transmission proportion, and the movement mode of human fingers is simulated; when loaded, the elastic plate provides passive compliance to adapt to a contact posture, and meanwhile, the strain sensor realizes contact force sensing by detecting deformation of the elastic plate, so that motion transmission, passive compliance and force sensing functions are integrated.

The utility model provides a kind of track inertial navigation measurement system, including track detection car, two wireless digital display displacement meters are symmetrically arranged and are installed in the downside of track detection car horizontal axis by connecting seat, and the mobile measuring end of one wireless digital display displacement meter is slidably connected to the downside of track detection car by sliding piece, the bottom of sliding piece is connected with first rolling piece, and the mobile measuring end of another wireless digital display displacement meter is connected with second rolling piece, and first rolling piece and second rolling piece are respectively rollingly connected to the inside standard track gauge of left and right tracks, and automatic leveling base is connected to the upper side of middle part of track detection car by fixing part and is built-in with multi-axis sensor.The utility model can directly measure track gauge value by two wireless digital display displacement meters, three-dimensional coordinate measurement component can obtain the three-dimensional coordinates of the center of automatic leveling base, then according to the azimuth angle, inclination and track gauge value measured by multi-axis sensor, the three-dimensional coordinate values of left and right tracks are calculated, so that the space attitude of track can be quickly measured for the initial adjustment of track.

The application provides an underground tunnel crack repairing intelligent drilling device, a mechanical arm and a method, relates to the field of underground intelligent repairing equipment, and aims to solve the problems of low intelligence degree and easy damage of a detection assembly caused by drilling impact during drilling of a crack in an underground project. A matched detection assembly is arranged on a drilling assembly, crack state parameters can be collected during drilling, and auxiliary positioning can be performed. The detection assembly is installed on a support plate through a sliding pair with a resilient piece. When vibration occurs during construction, part of the vibration can be absorbed by the resilient piece. The direction of action of the resilient piece is consistent with the drilling direction, so that the impact effect generated during drilling is improved, and the detection equipment is protected.

The application belongs to the technical field of power supply, and particularly relates to a power supply control method and system, electronic equipment and storage medium. The method comprises the following steps: acquiring setting data from a memory, an upper computer or a device panel as a setting value; collecting sampling data through a high-speed analog-to-digital converter, and performing high-speed digital signal processing by using a programmable logic chip, and then performing stable voltage, stable current and stable power control; acquiring control parameters corresponding to the load characteristics closest to the current setting value from the storage data as the initial data of starting up, or quickly searching for the corresponding output real-time tracking reference value and the intermediate state value of loop control; and through closed-loop control, the output reaches the setting value for different load characteristics. The application reduces the design difficulty of analog circuit, improves the response characteristics, and is convenient for realizing higher performance power supply control; meanwhile, the signal processing can be dynamically realized by adjusting the register parameters, which is convenient for automatic calibration and mass production.

This utility model discloses a wastewater treatment agent quantitative dosing device and a wastewater tank, comprising a multi-axis displacement unit, a quantitative dosing unit connected to the moving end of the multi-axis displacement unit, and a control unit. The quantitative dosing unit includes a storage component, a dosing pump, a quantitative component, and a spraying component interconnected by pipelines. The quantitative component includes a quantitative tank and a float plate disposed within the quantitative tank. The float plate divides the quantitative tank into an upper chamber and a lower chamber. The lower chamber connects to the dosing pump and the spraying component. A fixed sensor and a loading component corresponding to the sensor are disposed in the upper chamber. The loading component is connected to the float plate. The control unit is electrically connected to the sensor, the dosing pump, and the spraying component. This utility model improves the efficiency and quality of wastewater treatment and reduces the risks and costs of manual operation.

The utility model relates to a kind of helicopter pressure gauge tester, including shell, air pressure pump, trim pump and partial pressure chamber, shell inside is separately provided with air pressure pump, trim pump and partial pressure chamber, the input end of air pressure pump is connected with shell outside, the output end of air pressure pump is connected with the input end of trim pump, stop valve is set on the communication pipeline between air pressure pump and trim pump, the first output end of trim pump is connected with the input end of partial pressure chamber, the first output end of partial pressure chamber is provided with first connecting port, to-be-measured pressure sensor is electrically connected with to-be-measured pressure gauge by cable, shell is provided with single item ac 220V power socket, the second output end of partial pressure chamber is provided with second connecting port, the utility model can effectively solve the problem that pressure detection instrument is used multiple times, and improve calibration accuracy.

The utility model relates to the technical field of lamp testing equipment, in particular to an aviation obstruction light waterproof performance testing device which comprises a testing box, four limiting rods are evenly and fixedly installed in the testing box, a supporting plate is jointly installed on the four limiting rods in a sliding mode, and an inflator pump is fixedly installed at the center of the bottom end of the supporting plate. According to the aviation obstruction beacon testing device, the clamping plates are matched with the limiting plates to rapidly fix the aviation obstruction beacon, the clamping plates are driven by the connecting rods to contract, aviation obstruction beacons of different sizes can be fixed, the adaptability can be improved, the stability of the aviation obstruction beacon can be improved through the anti-skid blocks, the testing effect can be guaranteed, and the testing efficiency is improved. The air injection hole in the aviation obstruction beacon can be conveniently adjusted to the position which is located on the same horizontal axis with the inflator pump, the threaded lead screw is matched to drive the rotary base to horizontally move, the air injection hole of the aviation obstruction beacon can accurately move to the position below the inflator pump, rapid calibration of the air injection hole and the inflator pump is achieved, and testing of the waterproof performance is facilitated.

The utility model relates to photovoltaic support technical field especially is photovoltaic module with multifunctional installation support, including installation frame and two connecting frames, all rotatory settings have support rod on the connecting frame, all settings have connecting rod between two support rods and two connecting frames, still be equipped with fixed rod between two support rods, be provided with adjusting assembly between two connecting rods, the installation frame has the pressure plate of sliding connection through the connecting mechanism, be provided with drive assembly on the connecting mechanism, the lower extreme of support rod is provided with base, be provided with lifting structure between base with support rod, through drive assembly and connecting mechanism cooperation control the position of pressure plate, make pressure plate sustain downward force, thereby guarantee the pressure plate to photovoltaic module carry out pressure tightly fixed, when the specification of photovoltaic module changes simultaneously, the position of pressure plate pressure tightly also changes along with it, adapt to different specifications photovoltaic module.

The application relates to the technical field of measuring equipment, and discloses a measuring equipment calibration device which comprises a base, a first baffle, a second baffle and a tripod, the base is provided with a first measuring groove and a second measuring groove, the first baffle and the second baffle are perpendicular to the base, the second baffle is provided with a third measuring groove and a fourth measuring groove, an electronic level and a mirror are arranged on a ruler on the base, the tripod is used for assembling an optoelectronic autocollimator, and a needle gauge is arranged in each of the first measuring groove, the second measuring groove, the third measuring groove and the fourth measuring groove. Compared with the prior art, the ruler is adjusted by the needle gauge to form an angle difference with the base, different diameter needle gauges can effectively form multiple groups of angles, the angles in the pitch and lateral deviation directions can be generated at the same time, and the repeatability and stability of the reproduced angles are improved. The application also provides a measuring equipment error calibration method which is completed by using the above measuring equipment calibration device and has the advantages of simple operation, good stability and the like.

The application provides a wafer clamping device, comprising: a cavity, a through hole is opened in the top; a telescopic device is arranged in the cavity, the telescopic device has a telescopic end; a bearing table is arranged at the telescopic end and coaxially arranged with the telescopic end, the bearing table is used for bearing a wafer; a clamping centering mechanism is arranged in the cavity, the clamping centering mechanism comprises at least three clamping pieces arranged movably; a working state, the telescopic device drives the bearing table to extend out of the cavity through the through hole, when the wafer is placed on the bearing table, the telescopic device is retracted, and the clamping centering mechanism drives all the clamping pieces to clamp the wafer at the same time. The wafer clamping device provided by the application can automatically center the wafer during clamping and fixing of the wafer, so that the accuracy of the position of the wafer placed on the bearing table is ensured, and the production efficiency is improved.