44results about How to "Accuracy meets" patented technology

The invention discloses a two-stage space-time diagram network and multi-source information fusion time sequence probability prediction method and device, and relates to the technical field of artificial intelligence and big data analysis. The method comprises the following steps: acquiring historical wind speed sequence data and corresponding target variable sequence data; preprocessing the data, and constructing a training sample according to a preset time sliding window; constructing a time sequence probability prediction framework of the two-stage space-time diagram network and multi-source information fusion; based on the fluctuation correlation of the historical sequence data, constructing an adjacent matrix between nodes; inputting the training sample and the adjacent matrix between the nodes into a wind speed prediction model, training the model through a designed threshold perception loss function of a wind speed-power nonlinear relationship, and outputting a multi-node wind speed prediction probability of a first stage; and inputting the multi-node wind speed prediction probability and the multi-source environmental factor data into the gradient boosting tree model for second-stage prediction, and outputting a multi-node wind power prediction result. According to the invention, prediction errors can be reduced.

The utility model provides an operation smoke collecting device under a simulated operation microenvironment, which comprises a box body, a lifting support arranged on the box body, a group of rotor flow meters arranged on the lifting support, a group of detection pipeline components arranged on the box body in a penetrating manner, one end of each detection pipeline component is communicated with the corresponding rotor flow meter, and the other end of each detection pipeline component is positioned in the box body. And the box body is also provided with an air inlet hole and an electrotome wire inlet hole. The smoke collection micro experimental environment under the simulated surgical operation is provided, the functions are convenient and fast to use, the production efficiency is improved, the environmental pollution is reduced, and the experimental safety is improved. The particulate matter monitoring module and the compound collecting module provided by the device can effectively meet the detection requirement of the operation smoke in the microenvironment.

The invention discloses a mathematical model-based chemical process simulation data management system and method, and relates to the technical field of data management. The system comprises a data feature system construction module, a dynamic mapping rule generation module, a cross-scale collaborative data processing module and a matching relation adaptive optimization module. The method comprises the following steps: constructing a multi-scale data quantization feature system and generating feature vectors; establishing a dynamic mapping mechanism and an association matching rule set, wherein the association matching rule set comprises a cross-scale collaborative weight and a working condition dynamic threshold factor; checking data in multiple dimensions, complementing missing attributes and pushing the data as required; the feature vectors and mapping rules may be iteratively optimized through deviation analysis. The problem of data and model hidden mismatching is solved, working condition fluctuation is adapted, cross-scale simulation accuracy and robustness are improved, and safe and efficient circulation of data is achieved.

The invention discloses a chip image registration method, device and equipment, and relates to the technical field of image processing, and the chip image registration method comprises the steps: obtaining a preset overlapping ratio, and calculating and obtaining a preset overlapping region of adjacent chip images according to the preset overlapping ratio; according to the matching similarity in the preset overlapping area, obtaining the actual overlapping rate of the chip image; and according to the actual overlapping ratio, registering the adjacent chip images to obtain a target chip image. Through the above mode, according to the preset overlapping rate, the actual overlapping rate is obtained in the preset overlapping region according to the similarity, so that registration is completed according to the actual overlapping rate in the subsequent matching process, the size of the overlapping region in the registration process is accurate, and the phenomenon that the registration accuracy is poor in the subsequent registration process is avoided. And due to the fact that the calculation amount is increased due to the too large area and information loss is caused due to the too small area, the registration efficiency is improved, and the registration precision requirement is met.

The application relates to the technical field of intelligent sensors, and discloses a method and system for detecting appearance defects of a covered soil type liquefied hydrocarbon storage tank. The method comprises the following steps: acquiring ground surface temperature distribution data above a soil layer, generating an initial temperature sequence and separating a medium-high frequency disturbance component, determining a soil heat capacity delay effect parameter and correcting the temperature sequence; a super-temperature difference threshold value is used to strip the soil thermal physical influence to obtain a pure thermal anomaly signal; a thermal distribution law is restored and mapped to a three-dimensional coordinate system of the storage tank to determine a preliminary defect boundary; a gradient is calculated to accurately locate a corrosion layer damage position, heat insulation attribute data and a fire risk assessment model are fused to generate an early warning report containing a defect position, a risk level and a processing suggestion. The method can realize accurate and efficient detection of appearance defects of the storage tank and meet the high-precision and continuity requirements of safety monitoring.

This invention provides a method for analyzing the operating state of a motor simulator, relating to the field of motor simulation technology. The method includes: obtaining the corresponding quadrature-axis current and direct-axis current through simulation based on the acquired rated parameters, operating state parameters, and preset motor parameters of the motor simulator; constructing a corresponding geometric boundary model based on the direct-axis current and quadrature-axis current using preset constraints; and obtaining the operating state of the motor simulator based on the positional relationship between the geometric boundary model and the operating point, wherein the operating point is determined by the direct-axis current and quadrature-axis current. This invention can improve the accuracy of motor simulator testing.

The application discloses a kind of point cloud data processing method and device, it is related to computer vision technical field, the method includes: according to the original three-dimensional point cloud data of target object, the three-dimensional point cloud data corresponding to the guiding part of target object is determined;According to the three-dimensional point cloud data corresponding to guiding part, the space orientation of original three-dimensional point cloud data is corrected, and first three-dimensional point cloud data is obtained;The three-dimensional point cloud data corresponding to guiding part in first three-dimensional point cloud data is eliminated, and second three-dimensional point cloud data is obtained;From second three-dimensional point cloud data, extract the middle axis skeleton point cloud data;Based on middle axis skeleton point cloud data, determine point cloud rotation parameter;Based on point cloud rotation parameter, first three-dimensional point cloud data is rotated, and normalized three-dimensional point cloud data is obtained.The application can improve the precision of point cloud data normalization, to meet the demand of high-precision modeling or automated measurement.

The invention discloses a table look-up type deformation matching and electromagnetic mapping digital twinning system and a table look-up type deformation matching and electromagnetic mapping digital twinning method. The system pre-constructs a multi-physical field simulation database with speed as a main key, stores a deformation three-dimensional model, pressure field data, radar cross section (RCS) data and feature point displacement, and establishes a reduced scale model deformation-speed association list. In the manual mode, the speed is directly input to call corresponding multi-physical field data; in an automatic mode, the displacement of the feature points of the reduced scale entity model is detected in real time through a displacement detection module, the current deformation quantity is calculated, a speed major key is reversely matched by adopting a minimum absolute difference method based on the association list, and then corresponding multi-physical field data is called; and synchronously displaying the deformation three-dimensional model, the pressure field pseudo-color distribution and the RCS map on a visual rendering platform, and realizing digital mapping from entity deformation to a multi-physical field state.

The present application relates to a kind of based on multi-modal fusion's weld magnetic detection system and method, system includes: multi-modal sensor component, for obtaining the two-dimensional image data and three-dimensional point cloud data of weld;Industrial control module, for according to two-dimensional image data and three-dimensional point cloud data, using instance segmentation model and three-dimensional point cloud feature extraction network to identify weld area, and extract weld three-dimensional structure information, according to weld three-dimensional structure information to generate detection path, based on detection path to carry out weld defect analysis and positioning;Mechanical arm actuating mechanism, for connecting detection probe, drive detection probe to move according to detection path, and detection probe real-time acquisition weld detection signal and transmission to industrial control module.The present application realizes the full process automation of weld identification, three-dimensional modeling, detection path generation and defect identification, compared with prior art has significant technical advantage and practical application value.

The invention provides a photocuring composition, a preparation method thereof, a three-dimensional printed part and application of the three-dimensional printed part, and belongs to the technical field of three-dimensional printing. The photocuring composition comprises the following components in parts by weight: 10-40 parts of acrylic resin; 30 to 70 parts of a reactive diluent; 0.5 to 25 parts of pigment; and 0.2 to 15 parts of a photoinitiator. Wherein the active diluent comprises an oxetane compound.

The invention relates to the technical field of petroleum geological exploration and geophysical data processing, and discloses a fault rod extraction method and system based on a morphological erosion algorithm, which can be used for removing noise in low signal-to-noise ratio data and accurately segmenting a fault fracture zone, and carrying out erosion operation based on a directional anisotropic structural element customized by a tectonic stress field. The erosion operation is carried out along the dominant direction of the fault, the fracture zone is compressed towards the core axis of the fault by using the iterative erosion and feedback correction means constrained by the fault trend model, and the artificial limb on the fault rod is eliminated and the missing part on the fault rod is complemented by using the multi-attribute fusion verification and topological optimization method. According to the fault rod extraction method, a fault rod has higher authenticity and spatial continuity, a generated data body is input into a three-dimensional Kriging interpolation gap filling and then is converted through a coordinate system, so that the output fault rod data body can directly meet the precision required by tectonic framework modeling, and the fault rod extraction method suitable for low-signal-to-noise-ratio data is provided.

This application provides a forming system, including a forming machine; two first platforms, respectively located on opposite sides of the forming machine; each first platform is equipped with an alignment mechanism and a side-pushing mechanism, the alignment mechanism including a side baffle, the side-pushing mechanism including a first push plate, the side baffle and the first push plate being configured to push against opposite sides of the sheet material to be pressed on the first platform; two second platforms, respectively located on the side of the two first platforms away from the forming machine, each second platform being equipped with a vision positioning component; along a second direction, a rear stop mechanism and a side-pushing device are respectively arranged on opposite sides of the lower mold, the rear stop mechanism including a rear stop member, the side-pushing device including a third platform and a second push plate; along a first direction, vision inspection components are respectively arranged on opposite sides of the forming machine; and a traverse component. The forming system reduces the labor intensity of workers, achieves high forming consistency, and avoids safety hazards by forming the sheet material to be pressed.

The invention discloses a photovoltaic inverter maximum power point tracking method, electronic equipment and a medium. The method comprises the following steps: setting a first MPPT voltage according to an open-circuit voltage; obtaining first MPPT power according to the voltage average value at the end of the zero crossing point in the first power grid period and the second power grid period in the first control period and the first MPPT voltage; calculating a first MPPT current based on the first MPPT power and the first MPPT voltage; setting a second MPPT voltage according to the open-circuit voltage; obtaining second MPPT power according to the voltage average value at the end of the zero crossing point in the third power grid period and the fourth power grid period in the second control period and the second MPPT voltage; calculating a second MPPT current based on the second MPPT power and the second MPPT voltage; when the deviation between the first MPPT current and the second MPPT current is smaller than a threshold value, the maximum MPPT current and the minimum MPPT current between the first MPPT current and the second MPPT current are taken, and the weighted sum of the maximum MPPT current and the minimum MPPT current serves as the current value of the photovoltaic maximum power point tracking point.

This application discloses a current calibration loop and method for current calibration of a current-controlled DAC. The current calibration loop includes: a selected reference current source and a selected current source to be calibrated; a clamping management module that clamps the output nodes of the two sources to the same fixed potential to discharge the static current of the two output nodes in different calibration modes, retaining only the current difference; an error comparison module that amplifies the current difference into a voltage difference and outputs the comparison result; a calibration control logic module that generates a calibration control signal based on the comparison result; and a calibration module that injects error compensation current into the output nodes according to the calibration control signal, so that the compensated output current of the selected current source to be calibrated is equal to the reference current provided by the selected reference current source. By discharging most of the static current and retaining only the current difference for comparison, it can respond promptly to a wide current range, significantly improve the current calibration accuracy, and adapt to various calibration modes.

The invention relates to the technical field of five-axis machine tools, in particular to a five-axis machine tool rotary table driving device which comprises a rotary table, a sliding base and a machine tool body, the rotary table is rotationally connected to the sliding base along the vertical rotation axis, and the sliding base is slidably connected to the machine tool body in the X-axis direction. The linear driving device has the beneficial effects that the detection precision, the driving precision and the driving stability of the linear driving device are improved through the precise alignment of the reference point of the reading head assembly and the rotation center and the cooperative matching of rigid locking and thermal extension self-adaptive release functions realized by the clamp at the tail end of the lead screw; therefore, the adaptability of the linear driving device to use scenes with high precision requirements is improved, and the requirements for high-precision machining in the high-end manufacturing fields such as aerospace and mold manufacturing are met.

The invention relates to a mobile zoom optical system which comprises a first optical element group, a second optical element group and a third optical element group which are sequentially arranged from an object side to an image side in the optical axis direction, the first optical element group is fixed, and the second optical element group and the third optical element group are movable. The first optical element group comprises a first lens barrel and a first lens, and the second optical element group comprises a second lens barrel, and a second lens, a second spacing element, a third lens and a fourth lens which are assembled in the second lens barrel. And the third optical element group comprises a third lens cone, and a fifth lens, a sixth lens and a seventh lens which are assembled in the third lens cone and have negative focal power. The mobile zoom optical system satisfies the following conditions: 1.60 lt; f < 234 > / dbslt; 2.05, 2.06, 2.07; 3.35 lt, 3.35 lt; r3 / EPb2lt; 5.50); 1.75 lt, 1.75 lt; r4 / EPb2lt; and 4.55.

The present application belongs to the technical field of power system fault current limiting and switching device, and particularly relates to a method and system for analytically calculating the transient recovery voltage of a fast switch of a fault current limiter. By constructing an equivalent circuit of a power system configured with a fault current limiter under terminal fault, the time-domain characteristics of the transient recovery voltage after arc extinction of the fast switch are solved based on Kirchhoff's law; the Laplace transform is performed on the time-domain characteristics to obtain a frequency-domain expression; and the precise analytical calculation of the transient recovery voltage is completed through the inverse Laplace transform. The system is divided into three units corresponding to the equivalent circuit construction and time-domain characteristic calculation, the Laplace transform, the inverse Laplace transform and the transient recovery voltage calculation. The calculation model of the present application is consistent with the actual engineering scene, the analytical process is clear and rigorous, the randomness of faults and the differences in device characteristics can be fully reflected, the calculation accuracy is greatly improved, and the actual engineering needs for fault current limiter configuration and fast switch selection can be met.

The utility model discloses an anti-skidding plastic ruler which comprises a ruler body and an anti-skidding device, the ruler body is made of hard plastic, and the anti-skidding device is made of soft plastic. The anti-skid device is fused with the external area of the corner of the ruler body, the anti-skid device is distributed along the edge of the ruler body, the anti-skid device can bend and deform, the bending angle is adjustable, and a user can adjust the bending degree of the anti-skid device according to needs so as to adapt to different use scenes and operation requirements; the antiskid device made of soft materials and the rigid plastic ruler body are integrally designed, and through distribution and function optimization of the antiskid device and the rigid plastic ruler body, the antiskid performance of the ruler is improved, the operation convenience is enhanced, and the durability is improved; in addition, the deformable taking area is designed at the corner of the ruler body, so that the problem that a traditional ruler is prone to sliding is solved, and the experience of a user in the taking, placing and using processes is optimized.

The present application belongs to the technical field of 3D AOI industrial vision detection, and relates to a fiducial point detection method and device for electronic devices and a readable storage medium. A fiducial point to-be-positioned region image is collected, the fiducial point to-be-positioned region image is detected, and at least one coarse positioning circular region where the fiducial point is located is obtained. Based on the radius of each coarse positioning circular region and the radius of a standard fiducial point, the positioning score of each coarse positioning circular region is calculated. The coarse positioning circular region with a positioning score greater than a preset positioning score threshold is taken as a target coarse positioning circular region. The edge points of the target coarse positioning circular region are extracted multiple times, the edge points extracted each time are fitted, and multiple fitting circles corresponding to the target coarse positioning circular region are obtained. The difference between the radius of each fitting circle and the radius of the standard fiducial point is calculated, the fitting circle with the smallest difference is taken as the best fitting circle, and thus the fiducial point of the electronic device is obtained, effectively improving the detection precision and detection efficiency of the fiducial point.

The invention provides a multi-GHz clock tree dynamic phase calibration system and a deviation suppression method, and relates to the technical field of high-speed electronic system clock synchronization. According to the multi-GHz clock tree dynamic phase calibration system based on standing wave integrity monitoring and the deviation suppression method, a phased array radar realizes accurate beam pointing through sub-picosecond clock synchronization of hundreds of array elements, and the compensation precision of the system for environmental interference in a radar cabin is greatly improved in a full temperature range of-40 DEG C to 65 DEG C; phase deviation caused by temperature is suppressed and reduced through dynamic phase calibration, and radar ranging errors are reduced; and cable vibration bending compensation is carried out, phase deviation caused by bending and vibration is compensated for aiming at cable bending and vibration scenes among array elements, the speed measurement precision is improved, and the high-precision distance measurement and speed measurement requirements are met.

The application discloses a microwave antenna structure shape-keeping topology optimization method based on reliability, and belongs to the technical field of structure shape-keeping topology optimization, and steps include: S1, constructing a microwave antenna structure reliability shape-keeping topology optimization model with unit density as a design variable, with structure volume minimization as an objective function, and with shape-keeping accuracy reliability and flexibility reliability as constraint conditions; S2, adopting a sequential optimization and reliability evaluation method, and decoupling and solving the reliability shape-keeping topology optimization model in an alternating iteration mode of inner loop reliability analysis and outer loop topology optimization; and S3, outputting a microwave antenna structure shape-keeping topology optimization result meeting the reliability requirement. By adopting the method, the engineering uncertainty factors are fully considered, the structure lightweight design is realized under the premise of guaranteeing the microwave antenna shape-keeping accuracy and stiffness reliability, and the optimization solving efficiency and the structure robustness are improved.

The application discloses a kind of round runout detection devices of shaft, including shaft body support, shaft body support, height adjusting mechanism and dial gauge;The shaft body support has two, is connected installation rail respectively, shaft body support is installed on each, one of the shaft body support side is equipped with driving motor;The shaft body support is symmetrically provided with a pair of support rollers along center line, and the two ends are matched with the shaft body support;Positioning sliding block is connected on the installation rail, and the top is installed dial gauge;The height adjusting mechanism is arranged between two shaft body supports, and the top surface is respectively connected with two shaft body supports.The height-adjustable shaft body support of the present application cooperates with the height adjusting mechanism, solves the problem that the traditional device is difficult to adapt to different diameter shaft parts, improves the convenience of clamping and measurement repeatability;Dial gauge is flexibly moved on installation rail by positioning sliding block, realizes multi-point, arbitrary position detection along axis, overcomes the defects of single measurement point and limited coverage of traditional fixed dial gauge.

The utility model discloses a kind of connector rotary drive mechanism, it is related to connector production technical field, including support, outer shroud, drive motor, pedestal, main shaft and the like components. Drive motor is located in outer shroud and is installed on pedestal, its driving end is connected with main shaft, and main shaft is rotatably connected to pedestal. Main shaft end is sequentially connected chuck mounting seat and pneumatic chuck, for clamping connector. Main shaft bottom end is equipped with baffle, and photoelectric sensor is equipped below. When working, pneumatic chuck clamps connector, drive motor drives main shaft and the like components forward rotation, cooperates with laser-engraving equipment and inscribes parameter, after rotating a circle, baffle triggers sensor, then reverse rotation resets, and circulates operation. The mechanism can accurately drive connector rotation, ensure laser-engraving quality, improve production efficiency and product qualification rate.

The utility model relates to a roll tail detection device and a connection device. The roll tail detection device comprises a first coiled material which is being uncoiled and a detection device, the detection device comprises a first detection device and a second detection device, the first detection device is used for detecting the outer diameter of the remaining first coiled material after uncoiling, and when the outer diameter reaches a first numerical value, the second detection device is started to collect an image of the remaining first coiled material and recognize the coiled tail of the first coiled material. When the coiled material is about to reach the coil tail, the second detection device is started to recognize the image of the remaining first coiled material and recognize the coil tail, so that unnecessary resource consumption is effectively reduced, and the resource utilization efficiency is improved; meanwhile, the second detection device is triggered by accurately monitoring the outer diameter through the first detection device, it is ensured that the second detection device is started and accurately collects an image containing roll tail features when the second detection device is about to arrive at the roll tail, then high-precision roll tail recognition is achieved, and high efficiency and high precision of roll tail recognition are met.

The application relates to the technical field of measurement, in particular to an intelligent measurement method and device based on urban planning and architectural design. The method comprises the following steps: setting a flight route of a flying device, a target scanning area and a scanning position. Then, according to the measurement characteristics of a target measurement object in the target scanning area, a target wave band is selected from preset wave bands as a scanning wave band of a sub-area; the sub-area in the scanning range of the flying device at each scanning position is grouped, the sub-area is scanned according to the corresponding scanning wave band of each group, and point cloud data is acquired; the actual point cloud quantity in each grid space after fusion is compared with a standard point cloud quantity, the flight route of the flying device and the actual point cloud data are adjusted according to the comparison result; and a three-dimensional model is constructed according to the adjusted point cloud data and corresponding image data. The application solves the problem of low measurement precision and realizes efficient and accurate measurement of a target measurement area.

The invention provides a micro-pulse peristaltic pump type diabetes insulin pump which comprises a shell, a micro-pump medicine bin assembly, a micro motor and a gear assembly are arranged in the shell, and the micro-pump medicine bin assembly is detachably connected with the shell; a medicine bin containing insulin and a micro peristaltic pump used for pumping the insulin are arranged in the micro pump medicine bin assembly, and the two ends of a pump pipe of the micro peristaltic pump are connected with the medicine bin and an external medicine conveying guide pipe respectively. The micro motor is a flat motor, and the ratio of the diameter to the length of an armature of the micro motor is 8: 1. The insulin pump is different from a plunger type insulin pump existing in the current market, a power device adopts a micro peristaltic pump and is combined with a micro flat torque type motor, a speed reducing mechanism does not need to be arranged, the output torque is effectively increased in a limited space, and the dual requirements of the insulin pump for high-precision and low-power-consumption driving are met; the equipment is obviously simplified, and the weight of the equipment is reduced. Meanwhile, flexible supplement of liquid medicine can be achieved through the detachable medicine bin, the medicine bin can be repeatedly used, and the material consumption is reduced.

The invention provides a calibration test system and method for a satellite-borne nadir hyperspectral imaging load, and belongs to the technical field of hyperspectral imaging load test.The calibration test method mainly comprises the steps that (1) installation and debugging of the calibration test system are completed in an ultra-clean room, and the load is installed to a theoretical position; (2) selecting a calibration light source according to a load wave band and a view field range, and sequentially completing spectrum calibration and radiation calibration through the calibration test system; (3) installing a sample gas pool assembly in the calibration test system to complete the sample gas test of the load; and a debugging light path is established, and the spatial resolution test of the load is completed. Through the technical scheme provided by the invention, on the basis of meeting the calibration test requirement and precision, the calibration test process can be simplified, the calibration test efficiency is improved, and the method is suitable for the calibration test of the hyperspectral imaging load of the same type.

The invention provides a high-speed comparator offset front-end self-calibration circuit, and belongs to the technical field of analog-to-digital converter circuits in integrated circuit design. The self-calibration circuit comprises a calibration logic circuit, a calibration voltage generation circuit, a back gate bias of a comparator differential input geminate transistor and a comparator. Wherein the comparator and the back gate bias of the comparator differential input geminate transistor are constituent parts of the ADC circuit; and the calibration voltage generation circuit comprises a p-end calibration voltage generation circuit and an n-end calibration voltage generation circuit, and the two end calibration voltage generation circuits are symmetrical in structure. An original ADC circuit is multiplexed, only a small amount of calibration control logic and a counter are introduced to achieve self-calibration logic, a simple calibration voltage generation circuit is combined, calibration voltage is fed back to a back gate of a comparator differential input geminate transistor, the offset voltage of the comparator is adjusted in an approximation mode through the bulk effect, and the self-calibration logic is achieved. On the premise that the speed of the comparator is not influenced, low cost and high calibration precision are realized.

The utility model relates to the technical field of medical instruments, in particular to an endoscope lens adjusting structure and an endoscope, the endoscope lens adjusting structure comprises a mounting seat and a plurality of lens components which are sequentially sleeved, one of two adjacent lens components is a sleeving piece, and the other one is a sleeved piece; the sleeving piece is provided with an inserting hole for the sleeved piece to be inserted so as to limit the sleeved piece in the radial direction, an adjusting assembly is arranged between the sleeving piece and the sleeved piece, and the adjusting assembly comprises an adjusting screw in threaded connection with the sleeved piece and a positioning base plane; according to the utility model, the radial position precision of the lens assemblies is ensured by utilizing the shaft hole matching between the mounting seat and the lens assemblies and between the two adjacent lens assemblies, and then the rotary motion of the thread is converted into the axial position movement of the lens assemblies by utilizing the thread transmission principle, so that the precise adjustment of the axial position is realized; the precision of lens adjustment can be effectively met, tiny movement of the lens position is achieved, and the purposes of light spot gathering and light spot position adjustment are achieved.

The utility model relates to an electrical proportional double -core regulating valve, include: valve body, main air passage, actuating mechanism, wherein, the actuating mechanism includes: diaphragm assembly, pressure chamber, by setting in the upper diaphragm cover and lower diaphragm cover of valve body top and diaphragm assembly common enclosure together, electrical proportional valve interface, spring adjusting mechanism, set up in the upper diaphragm cover upper portion, for the diaphragm assembly applies the initial pressure downward, valve core subassembly, including coaxial arrangement big valve core and small valve core, the upper end of small valve core is connected with diaphragm plug, and the lower end is inserted into main air passage, and the head of small valve core is conical structure, big valve core is set in small valve core outside. Through the coordinated work design of unique size two valve cores, small valve core is responsible for the fine adjustment when small flow, and big valve core is responsible for the on-off when big flow, effectively expands the adjustment range, can satisfy to the complicated situation of both high accuracy and wide range requirement to flow control.