143results about How to "Guaranteed repeatability" patented technology

The invention discloses a core optical image equalization processing method based on a domain adaptive residual error full connection network, comprising the following steps: S1, estimating illumination components based on a Retinex theory and dynamic Gaussian filtering, realizing brightness domain adaptive division according to the difference of the illumination components, and recording boundary position coordinates of each partition; s2, cutting the original color digital rock core image according to the boundary coordinates of each partition recorded in the step S1, and storing the cut original color digital rock core image as an independent image file; s3, constructing a residual error full-connection network combining a transfer learning strategy and a domain adaptation algorithm, wherein a training target is to minimize a domain adaptation loss function to obtain an optimal prediction model; s4, using the optimal prediction model to correct an image edge region and outputting a brightness-equalized core image; according to the method, the brightness equalization effect can be remarkably improved while image details are kept, and the accuracy and generalization ability of the lithology recognition model can be greatly improved.

This utility model discloses an automotive duct cutting device with a rapid positioning mechanism, relating to the field of duct cutting technology. It includes a worktable and an upper clamp. A groove is formed on the upper side of the worktable. A first motor is fixedly connected to one side of the worktable, and a lead screw is fixedly connected to one side of the output shaft of the first motor. The lead screw is rotatably connected to the inner side of the groove. A slider is threaded onto the outer side of the lead screw, and a cutting mechanism is mounted on the upper side of the slider. A lower clamp is fixedly connected to the upper side of the worktable, and a spring-loaded mechanism is installed between the upper and lower clamps. A cavity is formed inside the worktable, located below the groove, and a positioning mechanism is installed inside the cavity. This device uses a motor-driven connecting rope to quickly pull down the upper clamp to press the duct, combined with precise control of the cutting position by the lead screw, and automatic release using a tension spring. The entire process is coordinated by a processor, achieving fully automatic, efficient, and precise operation of the duct from positioning and cutting to release.

The invention provides a non-contact on-line measuring device and method for excavator structural members, a double-scanning system cooperation mode is adopted, a tracker and a ball cage scanner are respectively used on two sides of a detection device, the ball cage scanners are installed on a cooperative robot to execute automatic scanning actions, and meanwhile, the robot is driven by the robot to move. The tracker and the robot are both installed on the linear guide rail, displacement operation can be carried out, the scanning and collecting range of the system is expanded, and therefore full scanning work of the large structural part is completed. The two scanning systems scan and collect the structural member from the left side and the right side at the same time, then data are spliced together, a three-dimensional point cloud model of the structural member is obtained, size information is analyzed and extracted, a detection report is generated, communication with a workshop data management system is carried out, and measurement data are integrated and applied.

The invention provides an epoxy modified cement-based material, the epoxy modified cement-based material comprises an organic phase structure and inorganic crystals, and the inorganic crystals are radially distributed on the surface of the organic phase structure; the organic phase structure is a spherical or sphere-like structure with the diameter of 3-15 microns; the inorganic crystal is of a needle-shaped, rod-shaped or sheet-shaped structure with the length being 0.3-3 microns and the diameter being 0.05-0.5 microns. The epoxy modified cement-based material disclosed by the invention shows good adhesion and dispersion resistance under water or in a humid environment, can realize rapid underwater construction, and keeps stable performance for a long time under harsh conditions such as a marine environment and a humid environment; the engineering requirements of multiple fields such as building structure repairing, underwater repairing, rapid first-aid repair, ocean protection and road and bridge engineering are met, and the integration of high strength, high toughness, strong interface bonding and long-acting durability is realized.

The invention belongs to the technical field of hair tail essential oil, and discloses persistently-shaped double-layer hair tail essential oil and a preparation method thereof.The preparation method comprises the following steps that a water-phase component with a shaping function is prepared, and the water-phase component comprises a water-soluble film-forming polymer; preparing an oil phase component with a repairing function, wherein the oil phase component comprises vegetable oil and an oil-soluble coloring agent; and filling: filling the water-phase component and the oil-phase component, and layering the water-phase component and the oil-phase component. The shaping and repairing agent has double synergistic effects of shaping and repairing, the oil-phase component provides deep nourishing, the water-phase component provides lasting shaping force and is used after being shaken up, perfect combination of shaping and repairing is achieved, and the problem that a traditional product is single in function is solved; lasting shaping; the unique visual experience is realized.

The invention provides a parameterization calculation method for a top cover modal and a pitch diameter of a water turbine, and belongs to the technical field of hydraulic mechanical structure dynamics and simulation automation. The method comprises the steps of parameter input, parametric modeling, automatic simulation control, pitch diameter identification and analysis and result output: after a parameter set is input, constructing a parametric modeling module based on Python and ANSYS Spaceclaim, and automatically generating a three-dimensional geometric model containing a basic panel, a rib plate and a connecting hole; an automatic simulation control module is constructed based on Python and ANSYS Workbench, and full-process automatic simulation is completed to obtain a modal analysis result; pitch diameter characteristic parameters are automatically recognized through a least square discrete Fourier transform algorithm of non-equiangular sampling and confidence degree judgment; and outputting results to form a standardized database. According to the method, automation and quantification of the whole process are achieved, modeling and simulation efficiency is improved, manual misjudgment is avoided, the method is suitable for different types of water turbine top covers, and reliable data support is provided for structural optimization and resonance risk assessment.

The invention belongs to the technical field of metal explosive cladding manufacturing, and discloses an explosive welding initiating explosive forming mold, an initiating explosive column and an explosive welding method. The mold comprises a pipe body and a cone assembled in the pipe body. The top end of the cone is upward, and a gap is reserved between the bottom face of the cone and the lower end face of the tube body, so that an upper columnar charging cavity and a lower conical energy gathering cavity are formed in the tube body. By means of the simple split design, traditional manual explosive pit digging operation is converted into a standardized process, the energy-gathered initiating explosive column with the highly-consistent shape, size and explosive loading amount is prepared, personal errors are thoroughly eliminated, and repeatability of initiation energy is guaranteed. And meanwhile, the bottom energy gathering cavity structure is beneficial to improving the energy utilization rate, and is particularly suitable for explosive welding of the multi-layer metal plate with the medium thickness. The device has the remarkable technical advantages of simple structure, low cost, time-saving operation, safety, high efficiency, batch production and the like.

This invention relates to an equivalent accelerated testing method for plexiglass based on creep constitutive equations, belonging to the technical field of accelerated testing of polymer structures. Addressing the testing requirements for the creep performance of plexiglass structures, this invention shortens the testing cycle and saves testing costs through the design of testing temperature and pressure. Simultaneously, the reduced testing time indirectly saves manpower and material resources, and also reduces the frequency of random risks such as power outages and equipment failures. Therefore, the testing method of this invention has significant timeliness and economic efficiency, and can effectively improve the accuracy of quantitative analysis, possessing important value for engineering practice.

The invention relates to the field of agricultural product processing equipment, in particular to a phase adjusting structure and an automatic adjusting tea frying machine based on the phase adjusting structure, the phase adjusting structure comprises a driving part and a transmission assembly, the transmission assembly comprises a transmission shaft, a connecting rod group and a swing rod, and the phase adjusting structure further comprises an eccentric wheel, the screw rod and screw sleeve adjusting mechanism is used for adjusting the distance between the fulcrum of the swing rod and the eccentric wheel, so that the initial angle and the swing amplitude of the frying plate are adjusted. The machine further comprises a rack, a controller and a frying plate; the synchronous belt transmission part is connected with the movable part; and the manual driving part and the automatic driving part are connected with the synchronous belt transmission part. The whole rigidity is effectively improved, vibration in the operation process is restrained, the repeated precision of the motion trail of the frying plate is guaranteed, the service life of the structure is prolonged, complexity and control redundancy of the mechanical structure are avoided, automatic adjustment is achieved, the machining efficiency is higher, and safety is higher.

The chain system fixed-point resampling method belongs to the technical field of rotating machinery signal processing, and aims to solve the problems that the time domain signal regularity of a single chain link is poor, the dynamics characteristics of the whole system are difficult to directly reflect, and the frequency domain feature extraction cannot be performed. The method comprises the following steps: extracting original data of discrete motion units from multi-body dynamics simulation results; at the preset data monitoring point position of the system, the nearest discrete motion unit is searched as a monitoring unit in real time by calculation; according to the data type, one of a direct method, a synthetic method and an average method is adopted to process the original data of the monitoring unit, and feature data representing the dynamics state of the fixed position are generated; and finally, the feature data are written into a file in time sequence. The time sequence data of the fixed position are collected through the fixed-point resampling method, and the problems that the data is strong in contingency, poor in regularity, and difficult to perform in-depth frequency domain and statistical analysis due to tracking a single motion unit are solved.

The invention discloses a tension testing device for cable detection, and relates to the field of tension testing devices, the tension testing device comprises a testing rack, the testing rack is movably provided with a testing pull-up seat, and the testing pull-up seat is provided with a pull-up clamp; the device further comprises a cable position detection device, and the cable position detection device is installed on the test rack. It needs to be explained that in the embodiment of the invention, sudden stop is triggered through mechanical swing of the cable holder, the skew fault can be identified in the initial stage, the tension coaxiality deviation caused by skew cable clamping and deformation and sinking of the pull-up seat is avoided, and the major safety accident of cable collapse is effectively avoided; according to the cable tension test device, the test data distortion caused by such factors is eliminated, the accuracy and repeatability of a cable tension test result are ensured, meanwhile, through reverse mechanical triggering, real-time detection and sudden stop of tiny deformation and sinking of the pull-up seat are realized, and hidden safety hazards are eliminated in advance.

The invention discloses a cylindrical battery measurement method based on machine vision, which comprises a double-line scanning correlation system, the double-line scanning correlation system comprises a top surface camera and a bottom surface camera, and the measurement method comprises the following steps: S100, the top surface camera collects a cylindrical battery top surface depth map, and the bottom surface camera collects a cylindrical battery bottom surface depth map; s200, intercepting a point set of a predetermined area of the top surface of the cylindrical battery as a top surface measurement point cloud, and intercepting a point set of a predetermined area of the bottom surface as a bottom surface measurement point cloud; s300, importing a predetermined calibration matrix T, and transforming the top surface measurement point cloud and the bottom surface measurement point cloud into the same coordinate system; and S400, respectively fitting the plane equation of the top surface measurement point cloud and the plane equation of the bottom surface measurement point cloud in the same coordinate system to calculate the distance between the top surface and the bottom surface so as to obtain the height dimension of the cylindrical battery. Manual direct measurement is avoided, measurement is achieved through computer vision, and the measurement reliability is improved.

The application discloses a method for obtaining a left ventricular papillary muscle target section and an ultrasonic evaluation method thereof, which comprises obtaining a standard basic section conforming to a guideline, and then determining a corresponding target section and a two-dimensional ultrasonic probe adjustment mode according to a front-lateral or rear-medial papillary muscle type to be imaged and a current standard basic section. Through taking the probe pose when the standard basic section is obtained as a benchmark, the two-dimensional ultrasonic probe is rotated by a specified angle or is directionally tilted under the premise of maintaining an acoustic window unchanged, so that an image of the target section clearly displaying a specific papillary muscle long axis or short axis shape is obtained; the problem of incomplete papillary muscle imaging and distorted shape caused by the fixed section of the conventional two-dimensional ultrasonic is solved, the target section can be repeatedly and stably obtained, and the integrity and accuracy of the papillary muscle ultrasonic imaging are significantly improved.

This invention relates to the field of biology and discloses a method for functional module analysis of gene expression data from multiple centers. The method includes single-center module identification, single-center robust module identification, single-center overlapping robust module merging, multi-center consensus module identification, sub-module identification of the consensus module, and functional annotation of the sub-modules. Specifically, it includes the following steps: S1, identifying genes with high-confidence module attribution in at least three centers; S2, identifying single-center robust modules; and S3, obtaining the identification results of the multi-center consensus module and its sub-modules. This method improves reproducibility by ensuring the reproducibility of single-center module analysis results through high robustness and consistency. It also improves reproducibility by extracting sub-modules from the consensus module results based on the robust module partitioning results of each center, preserving the differences in module partitioning between centers, and further improving the reproducibility of our consensus module and sub-module results in any single center.

The present disclosure provides a kind of nanofiber thermal conductivity measuring device, the measuring device includes: middle hollow base, first and second side wall are formed around the hollow place and oppositely arranged third and fourth side wall;Two conductive electrodes are formed on the first and second side wall respectively;And support layer, adhesive layer and suspension electrode are sequentially stacked from bottom to top, the suspension electrode is supported on the first and second side wall by support layer, current is applied to the suspension electrode by two conductive electrodes to make it as hot end, the thermal resistance of suspension electrode is greater than the thermal resistance of the nanofiber to be measured, and the two ends of nanofiber are supported on the suspension electrode and the fourth side wall respectively.The suspension electrode in the present disclosure has the characteristics of long electrode length and small current flow area, so it has much greater thermal resistance than conventional single fiber measuring device, and can solve the problem of low signal-to-noise ratio in low thermal conductivity nanofiber thermal conductivity measurement.

This invention discloses a method and system for anisotropic patterning correction of wafer warpage, comprising: obtaining the target anisotropic curvature compensation value of the wafer to be corrected; calculating the target equivalent thin film stress value to be achieved by the stress balance layer based on the curvature compensation value, the mechanical parameters of the wafer substrate, and the preset thickness of the patterned stress balance layer; determining the geometric parameters of the patterned stress balance layer using a quantitative relationship model, based on the target equivalent thin film stress value, the intrinsic stress of the selected thin film material, and Poisson's ratio; and fabricating a corresponding patterned stress balance layer on the back side of the wafer to complete the warpage correction. By designing the patterned stress balance layer, the anisotropic control of the overall thin film stress state of the back stress layer can be achieved; curvature compensation, both in magnitude and direction, can be independently designed for warpage differences in different directions of the wafer, thereby adapting to and correcting various complex asymmetric warpage morphologies.

The invention discloses a ship engine methanol fuel supply pipeline detection device, and relates to the technical field of pipeline detection, the ship engine methanol fuel supply pipeline detection device comprises a cabinet, and the upper surface of the cabinet is fixedly provided with a panel. By arranging the case and the panel, a firm protective shell and a flat operation platform are provided for the whole detection device, the case is made of an anti-corrosion material so as to adapt to the marine environment, and the panel serves as an installation reference of each functional module; the spraying mechanism is used for rapidly injecting a detection solution into the methanol fuel supply pipeline, a first connecting frame is fixedly arranged on the outer surface of the spraying mechanism, and the first connecting frame is fixedly connected to the inner wall of the panel. By arranging the spraying mechanism and the first connecting frame, a high-pressure injection system of a detection solution is formed, the first connecting frame provides accurate mounting and positioning for the spraying mechanism, and the spraying mechanism is responsible for generating controllable pressure to quickly inject the detection solution into a to-be-detected pipeline, so that the effect of sealing and detecting a supply pipeline is achieved.

The utility model discloses a plurality of point position locating crossbeam welding fixture, including component fixed clamp, the component fixed clamp includes base, and the base top is fixedly connected with mainboard through bolt, and the rear side top of mainboard is rotatably connected with the lower extreme of upper clamping seat through pin shaft, the rear side of mainboard still rotatably connected with clamping pneumatic cylinder, and the output shaft end of clamping pneumatic cylinder still rotatably connected with the rear end of upper clamping seat through pin shaft, and the action of clamping pneumatic cylinder can drive the front end opening and closing of upper clamping seat, thereby realizes the compression of crossbeam, the left side of mainboard still is equipped with movable positioning pin mounting seat through bolt, the movable positioning pin mounting seat includes first mounting plate and second mounting plate who set up mutually perpendicularly, the utility model discloses adopt the cooperative drive of multiple pneumatic cylinders, and control first, second positioning pin acts simultaneously from different directions, and accurately inserts workpiece original hole position, realizes the multiple point position cooperative positioning of complex crossbeam, and greatly improves the group precision.

This invention discloses a sublingual microcirculation imaging system with pressure detection and feedback control. The system comprises a shell, handle, inner support, focusing ring, circuit board, image sensor, probe, pressure sensor, and integrated unit. The integrated unit adjusts the focusing ring to control the probe movement based on the clarity of the sublingual microcirculation video and pressure information, until the video is stable and clear and the pressure reaches the target pressure value or a preset pressure range. This invention achieves real-time, accurate measurement and digital display of the probe-mucosal contact pressure in sublingual microcirculation imaging, enabling medical personnel of varying experience levels to quickly master and apply appropriate pressure, ensuring the standardization and repeatability of the examination.

This invention belongs to the field of high-temperature heat pipe performance testing technology, specifically relating to a fully autonomous adaptive heat pipe heat transfer performance testing method. It includes the following steps: Step S1: Generating a heat flux density benchmark based on geometric features; Step S2: Using P... base Based on this, differentiated power loading is performed using a stage-dependent loading coefficient β. During step S2, steps S3 to S5 are executed in parallel: Step S3: Parallel execution of adaptive physical stage switching based on a dual criterion of "temperature-anomaly"; Step S4: Parallel execution of autonomous steady-state determination for each power loading at key temperature points in the linear heat transfer stage and during each power loading in the limit approximation stage; Step S5: Parallel execution of full-cycle automated safety protection based on monitoring the second derivative of the evaporation section temperature. The beneficial effects are: improved adaptability of the testing method, compatible with heat pipes of different geometric dimensions; and effective improvement of testing efficiency through the implementation of a staged control strategy.

A RAP asphalt mixture asphalt extraction device relates to the field of road engineering material testing technology, and is used to solve the problems of insufficient filtration accuracy, low filtration efficiency, cumbersome operation, and lack of flow monitoring in existing technologies. The device includes an integrated frame (1), on which a stirring extraction module (2) and a pressurized filtration module (3) are installed. The liquid outlet of the stirring extraction module (2) is connected to the liquid inlet of the pressurized filtration module (3) through a guide pipe (5). The pressurized filtration module (3) includes three industrial syringe assemblies connected in series. Each assembly contains filter plates with different filtration accuracies. The device also includes the connection and working cooperation between the propulsion assembly and the syringe plunger (301-1) of the industrial syringe assembly. Gradient filtration is achieved by sequentially passing through a three-stage filtration unit with millimeter-level filtration layer, micron-level filtration layer, and nano-level filtration layer. This device can realize integrated operation, gradient filtration purification, pressurized high-efficiency filtration, and real-time monitoring of liquid flow.

The application discloses a kind of capacitive displacement sensors, it is related to sensor technical field, including shell, first polar plate, second polar plate and flexible hinge rod;Two first polar plate are parallel and aligned arrangement;Second polar plate is arranged between two first polar plate;Flexible hinge rod includes semi-flexible hinge and the first connecting rod and second connecting rod located in the two sides of semi-flexible hinge, first connecting rod is fixedly connected with the second end of second polar plate, second connecting rod is hinged with shell, on the side opposite to shell and second polar plate still hinged with counterweight structure, when first polar plate is in horizontal state, counterweight structure makes second polar plate in no-load state in horizontal state, when first polar plate is in vertical state, second polar plate in no-load state is in natural state of drooping;Through the above two aspects, keep the consistency of the measurement reference of sensor under different working conditions, guarantee the repeatability and stability of measurement result, to better meet the high-precision displacement measurement scene demand.

The application discloses a normal fault dislocation and earthquake time sequence coupling simulation test device and method in a supergravity environment, and the method comprises a rigid model box, a fault dislocation system, two normally closed electromagnetic valves, a manual hydraulic pump and a hydraulic oil pipe, wherein the fault dislocation system is arranged in the rigid model box; the two normally closed electromagnetic valves and the manual hydraulic pump are arranged outside the rigid model box; the manual hydraulic pump is connected with the two normally closed electromagnetic valves through the hydraulic oil pipe, and the two normally closed electromagnetic valves are connected with the fault dislocation system through the hydraulic oil pipe. The application realizes high-precision reproduction of the dynamic response of a rock-soil body and the structural disaster process under the time sequence coupling effect of fault dislocation and earthquake vibration by integrating a centrifuge supergravity field, a vibration table earthquake vibration simulation and a fault dislocation system, and provides an advanced test platform for studying the surface deformation law caused by fault dislocation and the coupling disaster mechanism of rock-soil engineering structures such as a roadbed, a slope and a tunnel.

The invention discloses a symmetric quasi-optical cavity design method for dielectric constant measurement, which belongs to the technical field of quasi-optical cavity design and comprises a mirror design method and a coupling design method. The design method of the mirror is as follows: the quasi-optical cavity is composed of a transmission-type spherical mirror with a symmetrical structure, and parameters needing to be designed mainly comprise the curvature radius of the spherical mirror, the aperture radius of the spherical mirror, the distance between the two spherical mirrors and the material of the spherical mirror; factors considered during design comprise intrinsic spectral line purity, stability of an open cavity, an open cavity Q value and a girdling radius; the coupling design method comprises the following step of feeding a signal into and out of the symmetrical quasi-optical cavity by adopting a coupling ring mode. According to the design method of the symmetric quasi-optical cavity, the coupling ring is innovatively placed between the two spherical mirrors for signal feed-in / feed-out, a traditional fixed small hole coupling mode is replaced, the coupling strength of the coupling ring is flexibly adjusted through parameters such as the ring diameter, the wire diameter and the position, and the problems that after small hole coupling machining, adjustment cannot be conducted, and flexibility is poor are solved.

The present application relates to the field of computer, particularly to a kind of injection molding machine storage control method, device and system, wherein injection molding machine storage control method can quickly pre-adjust screw before plasticizing, so that actual back pressure is below set back pressure, prevent the emergence of nozzle drooling and other problems caused by back pressure being too high in plasticizing stage;Further, through the coordinated adjustment of injection motor and plasticizing motor in plasticizing stage, the change of actual back pressure is more close to the set value, avoid the phenomenon of screw sudden stop, and the plasticizing motor starts to slow down when the screw reaches a certain position, instead of starting to slow down and stop running when reaching the end position of storage, so that the screw retraction speed is smaller, the end position of storage is smaller, and the repeatability of the end position of storage is guaranteed, so as to ensure the repeatability of production products.

This invention belongs to the field of high-voltage insulation testing of solid-sealed poles, and relates to a three-position opening distance tooling for solid-sealed poles and its usage method. It includes: a top cover; a sleeve assembly, the sleeve assembly comprising a sleeve body, a cam mechanism, and a handle; wherein the top cover is slidably connected to the sleeve body and can move axially relative to the sleeve body; the cam mechanism is hinged to the sleeve body and has at least three transition structures; the handle is drivenly connected to the cam mechanism; by rotating the handle, the cam mechanism is driven to rotate, and the different transition structures of the cam mechanism respectively drive the top cover to move relative to the sleeve body to a position corresponding to a different preset opening distance. A single device enables rapid switching of at least three different opening distances, thereby adapting to the different opening distance requirements of various high-voltage insulation tests and significantly improving the versatility of the tooling. It solves the problem of existing solid-sealed pole product opening tooling having many types and time-consuming and labor-intensive installations.

The application discloses a preparation method of high-purity sodium nitrate in the technical field of inorganic chemical industry, and comprises the following steps: dissolving crude sodium nitrate in deionized water and heating and stirring to obtain a crude solution; pre-saturating and activating a multi-dimensional cerium tungsten titanium heteropoly acid salt grafted mesoporous silica-aluminum skeleton material in saturated sodium nitrate aqueous solution; adding the activated material into the crude solution to perform stirring reaction, and filtering to obtain a sodium nitrate mother liquor; performing vacuum concentration, natural cooling crystallization, centrifugal separation and drying on the mother liquor, so that high-purity sodium nitrate is obtained. The method can efficiently remove impurities in sodium nitrate, and the product has high purity.

This invention relates to the field of optoelectronic device testing technology, and more particularly to a testing device for magneto-optical switches. The technical solution includes a worktable, a light source connection mechanism, an optical frequency conversion mechanism, an optical domain processing and detection mechanism, and a control console. The light source connection mechanism drives a tunable test laser to connect to the magneto-optical switch; the optical frequency conversion mechanism combines the output light of the magneto-optical switch with the pump light through an optical fiber combiner, and then performs frequency up-conversion via a PPLN waveguide to convert the infrared light into visible light; the optical domain processing and detection mechanism uses an optical beam splitter to branch the signal to an optical modulator group, a polarization decoding mechanism, etc., for parallel processing and detection. This invention overcomes the speed limitation of infrared detection through optical frequency conversion, achieving high-speed, high-precision synchronous comprehensive testing of multiple parameters such as the opening and closing time, insertion loss, isolation, and polarization-related loss of the magneto-optical switch. It features a high degree of automation and stable and reliable test results.

The application discloses a servo cut-off valve group, which comprises a first valve body and a second valve body integrated on a valve seat. Both the valve bodies are provided with valve cavities, and the valve cavities are internally provided with valve spools driven by a servo motor through a screw rod. The valve bodies are provided with outer ring channels communicated with inlet and outlet of the valve seat on the side surfaces, the outer ring channels are communicated with the valve cavities through a plurality of uniformly distributed lateral flow channels, and the inner walls of the valve cavities are further provided with inner ring channels. The longitudinal flow channels at the bottoms of the two valve cavities are communicated with each other through channels in the valve seat. When the two valve spools synchronously rise above the lateral flow channels, fluid can sequentially pass through the flow channels, and the valve is opened; when the two valve spools synchronously descend to completely cover the lateral flow channels, the valve is closed. The two valve cavities are communicated at the bottoms to form a pressure balance cavity, so that the valve spools are hardly subjected to axial thrust when the valve is closed, and high pressure is converted into sealing force in the radial direction of the valve spools, thereby fundamentally solving the high pressure leakage problem of traditional cut-off valves, and the application is especially suitable for high pressure equipment such as filter presses.

This invention discloses a method and equipment for detecting mold etching. The detection method includes acquiring a global image of a turntable and the mold to be inspected on it, and establishing a turntable coordinate system; identifying the detection area of ​​the mold to be inspected through a controller, and dividing the detection area into an etching texture detection area, a surface defect detection area, and a cavity size and position detection area to determine the coordinate range of the points corresponding to each detection area; the controller generates a detection motion trajectory for each detection area based on the coordinate range of the points; the controller controls a rotary drive device to drive the turntable to rotate, positioning the mold to be inspected at the shape detection station, defect detection station, and dimensional tolerance detection station; in this way, the quality qualification judgment of all indicators of mold etching can be completed, and the trajectory matching of different detection items can be achieved, avoiding the detection blind spots caused by the disconnect between the trajectory and the detection requirements, so as to adapt to the detection of molds with complex cavities and multi-area etching, and ensure the comprehensiveness and accuracy of the detection.