132results about How to "Shorten test time" patented technology

The invention discloses a Fluent-based numerical simulation and experimental design method for shaking of liquid in a tank of a tank truck, and belongs to the technical field of numerical simulation of fluid dynamics (CFD). The method includes the steps that the hole opening position of the wave-proof plate serves as an independent variable, multiple hole opening position schemes are designed, liquid shaking related indexes are determined to serve as dependent variables, a geometric model is established according to the actual structure of a tank truck tank body, a fluid mechanics model and boundary conditions are set, a solver is configured, output parameters and numerical simulation initial values are set, and an experiment is executed. The liquid shaking process of a certain swash plate trepanning scheme is simulated, acting force data, namely shaking index data, between liquid shaking and the inner wall of the tank body is recorded, the advantages and disadvantages of each trepanning position scheme are evaluated based on the shaking index data, and the optimal scheme is determined. According to the method, a real object experiment is replaced by CFD numerical simulation, parameter setting is carried out, the experiment cost and the experiment risk are remarkably reduced, the experiment efficiency is improved, and data support can be provided for industry design.

This invention relates to the field of nuclear safety equipment testing technology. It provides a method for optimizing parameters in accelerated reliability testing of nuclear safety-grade valves. The method involves the following steps: establishing a correlation model between accelerated stress and life parameters; calculating the acceleration factor and formulating an initial test plan; deriving the theoretical sample size based on the success-failure test method combined with confidence requirements; constructing an extended coefficient table using the range-extended test method to optimize test parameters; generating multiple accelerated test plans through chi-square distribution verification; eliminating plans that do not meet the life characteristic threshold; determining the optimal sample size, number of failures, and test cycle through comprehensive test cost and risk analysis; and finally outputting a complete test plan including the action interval time. This method solves the problems of limited test samples, insufficient failure data, low confidence levels, and difficulty in adapting accelerated models in existing high-reliability valve technologies.

The present application relates to a method for predicting fatigue crack propagation rate of a diffusion bonded dissimilar titanium alloy laminate structure, which is based on the mechanical properties of the constituent materials of the dissimilar titanium alloy laminate structure, i.e., the quasi-static tensile properties of the two titanium alloy plies. The method for predicting fatigue crack propagation rate of the diffusion bonded dissimilar titanium alloy laminate structure first establishes the relationship between the fatigue crack propagation rate of the laminate structure and the mechanical properties of the laminate structure, and then establishes the relationship between the mechanical properties of the laminate structure and the mechanical properties of the dissimilar titanium alloy single ply, thereby describing the relationship of the fatigue crack propagation rate of the laminate structure. Compared with the prior art, the method of the present application has the advantages of simple and convenient test, engineering precision, rapid and practical, etc., and effectively reduces the test cost and test time required for crack propagation test of the dissimilar titanium alloy laminate structure processed from different parameters.

The utility model relates to the technical field of magnetic device testing, in particular to a magnetic device multi-station testing mechanism which comprises a carrying mechanism and a testing mechanism, the carrying mechanism comprises a portal frame, a carrying transmission module, a carrying connecting frame and a carrying grabbing module, and the testing mechanism comprises a Y-axis transmission module, a testing station and a testing jig. The carrying transmission module is arranged on the portal frame, the multiple carrying grabbing modules are arranged, the carrying connecting frame is arranged on the Y-axis transmission module, the multiple carrying grabbing modules are arranged on the carrying connecting frame side by side, the testing station is provided with an upper testing module and a lower testing module, and the upper testing module and the lower testing module are oppositely arranged. Therefore, the magnetic device on the test fixture can be tested. The device is high in automation degree, a series of operations such as carrying of magnetic devices and testing of each item are automatically completed, manual intervention is reduced, and labor cost is reduced.

The utility model belongs to the technical field of steel-plastic composite belt testing, and particularly relates to a strength testing device of a steel-plastic composite belt for an optical cable, which comprises a support table, and a control box is arranged above the support table; the testing mechanism comprises a testing table and a driving push rod, the testing table is fixed to the top of the supporting table, a supporting plate is fixed to the testing table, an air pressure rod is fixed to the supporting plate, an output shaft of the air pressure rod is fixedly connected with the testing plate, the testing plate is slidably connected with the testing table, and the driving push rod is arranged in the control box and fixed to a connector. The fixing mechanism comprises a connecting plate, a connecting shaft is fixed to the connecting plate, a rotating cylinder is rotationally connected to the interior of the connecting plate and is in threaded connection with a fixing rod, and the fixing rod is fixedly connected with the fixing plate; under the condition that the steel-plastic composite belt is not disassembled, detection in different modes is carried out, the tensile strength and the bending strength of the steel-plastic composite belt can be effectively tested, the steps of repeated disassembly and assembly can be reduced, and the detection efficiency of the test is improved.

The utility model discloses a handrail swing durable tool which comprises a bottom plate and a cross beam, the cross beam is fixed on the bottom plate, a swing mechanism is arranged on the bottom plate, a force sensor is hinged to the swing mechanism, and a connecting mechanism is arranged on the force sensor. A simulated handrail is arranged on the cross beam, and after a detected hanging ring is fixed between the connecting mechanism and the simulated handrail through cooperation of the connecting mechanism and the simulated handrail, the detected hanging ring of the handrail is driven to swing through the swing mechanism; the tool further comprises a control system capable of controlling the tool, and the swing mechanism and the force sensor are in electric signal connection with the control system. According to the utility model, the tested armrest hanging ring can be automatically swung, the test time is greatly shortened, the cost is reduced, the bearing capacity of the tested armrest hanging ring can be monitored and displayed in real time, and the test result is ensured to be accurate and reliable.

The utility model provides a kind of sensor coil testing device, including base, the middle part of base top surface is equipped with positioning slot and the mounting hole being communicated with positioning slot, positioning slot is used to position and place coil to be tested;Probe assembly, it is fixed in mounting hole, for with multiple pin on coil to be tested simultaneously electrically connected;Cover, the side of cover length direction is rotatably connected with the side of base length direction by rotating member, cover is equipped with limiting slot and the connecting hole being communicated with limiting slot, connecting hole is equipped with the connecting piece for with probe assembly electrically connected;When cover is covered on base, positioning slot and limiting slot form fixed space adapted with coil to be tested by surrounding, and probe assembly and the pin of coil keep electrically connected.The utility model can realize reliable anti-misoperation function when coil is placed, can realize with all pin of coil simultaneously electrically connected when testing, can complete all electrical parameter test at a time, improve test efficiency.

The application relates to the field of testing and aims to solve the problem of low testing efficiency, and provides a display screen testing method, electronic equipment and computer storage medium. The display screen testing method is applied to electronic equipment including N display screens, N is an integer greater than or equal to 2, the method comprises the following steps: obtaining the testing configuration of a current testing scene; obtaining the multi-screen configuration attribute of the testing configuration, the multi-screen configuration attribute is used for indicating the target display screen to be tested in the current testing scene; determining M target display screens to be tested in the N display screens according to the multi-screen configuration attribute, M is an integer greater than or equal to 2, and M is less than or equal to N; obtaining the screen information of the M target display screens; controlling the M target display screens to display according to the screen information of the M target display screens; and applying corresponding stress to the displayed M target display screens according to the current testing scene. Two or more target display screens to be tested can be configured in the testing scene, and the testing efficiency is improved.

The application discloses an anchor rod accelerated corrosion test method based on surrounding rock dissolution, stress and temperature, which comprises the following steps: step one, determining the actual temperature value, corrosion ion composition and PH value of seawater, and preparing a corrosion solution; step two, obtaining 12 groups of surrounding rock test blocks in a roadway, putting the test blocks into a vacuum container and adding the corrosion solution, taking out the corroded surrounding rock test blocks, and collecting the dissolution solution; step three, installing an anchor rod on each surrounding rock test block and adjusting the prestress of the anchor rod; step four, placing the surrounding rock test blocks in a liquid storage tank and adding the dissolution solution to the liquid storage tank; step five, after a corrosion period, taking down the anchor rod, and calculating the corrosion rate and corrosion weight loss rate of the anchor rod; step six, performing phase analysis on the corrosion products on the surface of the anchor rod, testing the mechanical properties of the anchor rod and a tray, obtaining the fracture characteristics of the surface of the anchor rod, and analyzing the corrosion mechanism. The application considers the influence of the dissolution of surrounding rock and seawater on the corrosion of the anchor rod, truly simulates the corrosion condition of seawater on the anchor rod under the surrounding rock environment, and accurately judges the actual service life of the anchor rod.

The present application relates to the technical field of integrated circuit layout detection, and particularly relates to a curve layout test pattern generation method and system based on machine learning, comprising: obtaining historical curve layout data and preprocessing to obtain an effective data set; extracting geometric and defect correlation features, and obtaining a feature matrix through correlation analysis and dimension reduction; generating a defect mode label by K-means clustering combined with contour coefficient correction clustering number; inputting the feature matrix and the label into a classification model to output parameters to generate an initial test pattern, and obtaining an optimized test pattern through redundancy and coverage optimization; importing a test system for verification, and if the verification does not meet the standard, the model is retrained, and if the verification meets the standard, the final pattern is output. The present application realizes accurate identification of defect modes with the aid of machine learning, balances detection accuracy and efficiency, improves the applicability of test patterns, and is suitable for integrated circuit curve layout detection.

This invention provides a method and system for reconstructing the full-band electrochemical impedance spectroscopy (EIS) of lithium-ion batteries. The method includes: performing distributed relaxation time (DRT) analysis on each group of battery EIS samples to obtain DRT spectra; aligning the DRT spectra on the logarithmic time constant axis and performing ensemble statistics, selecting peaks and / or valleys that stably appear under multiple operating conditions based on statistical stability, and mapping them to obtain a set of conditionally invariant characteristic frequencies; selecting characteristic frequency points that satisfy the sampling budget from the set of conditionally invariant characteristic frequencies, and performing sparse EIS measurements on the target battery at these characteristic frequency points to obtain sparse complex impedance inputs; generating a full-band complex impedance sequence based on the sparse complex impedance inputs using an autoregressive reconstruction model; and performing battery state estimation and fault diagnosis based on the full-band complex impedance sequence. This invention significantly improves the continuity of the spectral shape and the generalization ability across operating conditions under sparse sampling conditions, while reducing the full-spectrum testing time and sampling burden.

This application provides a method for assessing the thermal fatigue life reliability of thermal interface materials. The method includes: applying boundary conditions and temperature loads to a simulation model of the thermal interface material; specifying the physical quantities of the thermal interface material to be output by the simulation model; and enabling the simulation model to perform simulation. Based on the simulation results, the method determines the thermal fatigue life reliability of the thermal interface material within a preset temperature variation range. This application solves the problem in related technologies where the assessment of the thermal fatigue life reliability of thermal interface materials relies on actual reliability testing after chip packaging, resulting in long processing times and high costs.

The application discloses a kind of complex lighting conditions underwater artificial crack dataset construction method, it is related to image dataset production technical field, including, collection crack picture and extract crack curve generation coordinate information, based on this, construct crack 3D model and prepare concrete standard test block;The test block is placed in water, and underwater crack image under conventional, dim and uneven illumination is collected, and is classified after pre-processing according to illumination condition;Stable Diffusion model based on LoRA fine-tuning is used, and different illumination condition images are input respectively to train and optimize, and style expansion image is generated, and pre-processing image constitutes unlabeled data together;Through image enhancement algorithm processing the data, after the enhanced image is labeled, the label is corresponded with the original image, and the underwater artificial crack dataset under complex lighting conditions is constructed, the application solves the problem that actual underwater crack disease is difficult to collect, meets the core demand of engineering practice, and provides richer data support for underwater structure crack detection and segmentation model training.

The invention belongs to the technical field of aircraft fire extinguishing design, and provides a large amphibious aircraft water throwing efficiency data expansion method, which comprises the following steps: carrying out a pre-flight test of an aircraft to obtain test state points of aircraft water throwing efficiency, including typical test state points and atypical test state points; carrying out water throwing efficiency tests on different test state points, summarizing and analyzing test data, carrying out water throwing efficiency tests on test state points corresponding to invalid data again, summarizing the test data again, and fitting the test data to obtain different water throwing efficiency relation curves; and typical test state point results are extracted to fit coefficients of the water throwing efficiency relation curve, the coefficients are combed, a change relation curve of the water throwing efficiency and different test state points is constructed, and a change curve of the water throwing efficiency along with the water throwing height under each test state point of the airplane is expanded. According to the method, data validity judgment can be improved, the test process is accelerated, and unpredictability of environment variable control caused by an overlong test period is avoided.

The utility model discloses a kind of multi-channel capacitor internal explosion test system, it is related to capacitor test technical field.Multi-channel capacitor internal explosion test system includes: test oven, for placing multiple capacitors to be measured, and provide test environment for multiple capacitors to be measured;Several multi-channel test board cards, each multi-channel test board card has multiple test channels, each test channel has constant-current circuit, voltage acquisition point and current acquisition point, constant-current circuit is electrically connected with corresponding capacitor to be measured, for setting the constant-current current flowing through corresponding capacitor to be measured;Master module, with multi-channel test board card electric connection;Power module, with master module and multi-channel test board card electric connection respectively;ADC module, with voltage acquisition point, current acquisition point and master module electric connection respectively.The multi-channel capacitor internal explosion test system of the utility model embodiment can simultaneously carry out ageing test and internal explosion test to multiple capacitors, improve test efficiency.

This utility model relates to the field of lubricating oil performance testing technology, specifically a two-phase separation temperature testing device, including a sapphire autoclave. A testing component is mounted on the top of the sapphire autoclave, and a protective component is mounted on one side of the autoclave. The testing component includes a sealed top cover, and a first sample inlet tube is fixedly connected inside the sealed top cover. This two-phase separation temperature testing device, by installing the testing component, allows the first and second sample inlet tubes to be inlet pipes for refrigerant and refrigeration oil at room temperature. A "constant pressure injection vessel" achieves high-temperature, constant-pressure refrigerant injection, thereby changing the refrigerant / refrigeration oil ratio in the system. This allows for continuous testing without cooling, saving testing time.

The utility model discloses a cable test system, which comprises a test tool, a routing line instrument and a tested cable which are connected in sequence, and is characterized in that the routing line instrument is used for forming a line configuration scheme according to timing information and the number of cable cores and controlling the on and off of the instrument according to the line configuration scheme; therefore, when the instrument is conducted, the test tool carries out corresponding tests on the tested cable. According to the utility model, the multi-core cable test time can be reduced.

The invention relates to an equal-water-level moisture-permeable cup device capable of accurately quantifying moisture evaporation fraction and a measuring method thereof. The equal-water-level moisture-permeable cup device comprises a moisture evaporation system, a moisture fraction metering system and an automatic water supply system, the moisture evaporation system comprises a moisture permeable cup and a water storage bottle, and the moisture permeable cup is connected with the water storage bottle through a U-shaped pipe; the water content metering system comprises a liquid level sensor for monitoring the height of the liquid level in the water storage bottle in real time, and an acquisition card for converting the liquid level variable quantity into an electric signal; the automatic water supply system comprises a water supply tank, a guide pipe, a clamping mechanism and a relay. Weight errors caused by condensation / moisture absorption or long time intervals in a traditional weighing method are eliminated, the total water supplementing amount can be calculated in a high-precision mode by monitoring the descending volume of the liquid level in the water tank or the reduced reading weight of the electronic balance, then the evaporation amount is reversely deduced, the water vapor permeability is calculated, and the water vapor permeability is calculated. The accuracy of a water vapor permeability result is ensured, and the moisture permeability of the textile material is accurately evaluated.

This utility model discloses an automatic testing system for flight controllers, relating to the field of unmanned aerial vehicle (UAV) technology. It includes a control unit, a sensor unit, a storage unit, a detection unit, a power supply unit, a display unit, an input unit, and an interface unit. The control power supply includes a master MCU and a slave MCU. The control unit is connected to the sensor unit, storage unit, detection unit, power supply unit, display unit, input unit, and interface unit. The sensor unit includes a compass, a barometer, and an IMU, and is connected to the detection unit. The storage unit contains a TF card. This utility model eliminates the need for additional instruments, reducing the cost of purchasing equipment. Furthermore, only the automatic testing system needs to be learned, reducing the learning difficulty and manual training costs for workers. Simultaneously, the flight controller is connected to the system via a single cable, reducing connection difficulty and shortening testing time from approximately 2 hours to about 10 minutes.

The invention relates to an AI accelerator performance prediction method and device, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: running an AI model on a reference AI accelerator, and obtaining various bottom layer performance data generated when the AI model runs; acquiring a first ratio between the consumed duration of the underlying processing process corresponding to each type of underlying performance data and the total consumed duration of underlying processing; obtaining a performance difference ratio between the target AI accelerator and the reference AI accelerator; according to the performance difference ratio and the first specific value, calculating a second specific value between the time consumed when the target AI accelerator executes the same underlying processing process as the reference AI accelerator and the total time consumed by underlying processing; and obtaining the performance multiple of the target AI accelerator compared with the reference AI accelerator according to the first ratio and the second ratio. By adopting the method, the evaluation cost and the prediction time of the target AI accelerator can be reduced, and the test efficiency and the prediction accuracy are improved.

This invention specifically discloses a test device for testing the reflective performance of traffic road markings. The device includes a test chamber, with an asphalt road sample placed at the bottom. Reflective road markings are applied to the road surface, and a drainage device is provided on the side of the asphalt road. An environmental simulation device and a road marking light-sensing test device are respectively installed above the road markings to be tested. The environmental simulation device consists of a heating device, a cooling device, a raindrop device, and a friction device, simulating the effects of different environmental and vehicle factors on traffic markings. The road marking light-sensing test device consists of a sliding block, a rotating shaft, an illumination lamp, and a retroreflection coefficient measuring instrument. This invention can simulate complex environments such as wet-dry cycles, wheel friction, and alternating hot and cold temperatures on the road markings on the asphalt sample. Finally, the data received by the retroreflection coefficient measuring instrument is used to analyze the reflective performance of the road markings, thus more realistically reflecting the reflective performance of traffic road markings.

This invention relates to a method, apparatus, and system for optimizing the sensitivity, extinction ratio, and EMI of long-distance optical modules. The method mainly includes: detecting the output sensitivity of the optical module at different temperatures; compensating and adjusting the voff voltage based on the sensitivity shift at different temperatures; after compensating and adjusting the voff voltage, compensating and adjusting the bias current based on the optical power shift at different temperatures; detecting the output extinction ratio of the optical module at different temperatures; compensating and adjusting the Vmod voltage based on the extinction ratio shift at different temperatures; detecting the EMI of the optical module at different temperatures; if the EMI is unqualified, compensating and adjusting the Vmod voltage; if the EMI is still unqualified after multiple compensation and adjustments of the Vmod voltage, compensating and adjusting the RX amplitude voltage and RX pre-emphasis voltage to ensure that the sensitivity, extinction ratio, and EMI of the optical module are all qualified. This invention can optimize the sensitivity and extinction ratio of the optical module to the optimal value at various temperatures while ensuring EMI compliance.

This invention proposes a high- and low-voltage line strong discharge monitoring system and method based on video image recognition, relating to the field of strong discharge monitoring. It includes a camera for acquiring video streams of high- and low-voltage lines and sending them to an image analyzer; the image analyzer extracts keyframe images from the video streams, extracts static and dynamic spark features based on the keyframe images, and inputs a feature vector composed of these features into an extreme learning machine for spark recognition, generating a discharge warning signal, which is then sent to a remote server; the remote server receives and displays the discharge warning signal. This invention improves the accuracy of video spark image recognition and can quickly and accurately determine the discharge location, ensuring the safe and stable operation of the power grid and reducing economic losses caused by transmission line discharge faults, thus having significant social and economic implications.

The application provides a test method and application for quantifying silicon-carbon and graphite capacity in a mixed electrode, and relates to the technical field of batteries. The test method uses XRD technology to obtain diffraction peak intensity of each phase of graphite in a pure graphite negative electrode sheet, calculates specific capacity constants corresponding to each phase of graphite according to the relationship between the diffraction peak intensity of each phase of graphite and the relative specific capacity of each voltage platform of the pure graphite negative electrode sheet, then obtains the diffraction peak intensity of each phase of graphite in a silicon-carbon / graphite mixed negative electrode sheet through XRD, combines the calculated specific capacity constants corresponding to each phase of graphite, measures the real specific capacity contribution of silicon-carbon and graphite under each SOC condition in the mixed negative electrode sheet, and calculates the lithium intercalation amount of the negative electrode material according to theoretical calculation. The test method can be applied to the determination of the silicon-carbon and graphite capacity in silicon-carbon / graphite mixed electrodes with different silicon doping ratios, the test result is real and reliable, continuous and stable, and the test time can be saved.

The embodiment of the utility model provides a heating element testing device. The heating element testing device comprises a piece taking mechanism, a bearing mechanism and a detection mechanism. The piece taking mechanism comprises a piece taking head, and the piece taking head is used for taking a heating element to be tested; the bearing mechanism comprises a carrier, and the carrier is used for bearing the heating element taken by the material taking head; the detection mechanism comprises a test plate and a test coil, the test coil is arranged at one end, close to the carrier, of the test plate, at least part of the heating element enters the test coil, and the performance of the heating element arranged on the carrier is tested through the test coil and the test plate. According to the heating element testing device provided by the embodiment of the invention, the testing time can be shortened, the production efficiency can be improved, and the heating element can be prevented from being deformed in the testing process to influence the performance by utilizing a machine in a vacuum adsorption and flexibility mode.

This utility model relates to the technical field of pile foundation skin friction testing, and discloses a device for rapidly testing the negative skin friction of pile foundations in high-fill mountainous areas. The device includes backfill soil, beneath which lies a strongly weathered rock layer, and below that, a moderately weathered rock layer. A data acquisition system is installed on the left side of the top surface of the backfill soil, and a loading oil pump is installed on the right side. Utilizing the end resistance from the rock foundation load test to provide the reaction force, combined with data from pile stress sensors, the distribution characteristics of negative skin friction on the pile side in high-fill areas can be rapidly and quantitatively analyzed, providing a measured basis for pile foundation bearing capacity assessment and engineering design. This method uses the upward displacement of the pile under the action of a load cell to replace the settlement of the foundation soil, thereby efficiently testing the negative skin friction, significantly reducing testing costs and saving testing time.

The invention relates to the technical field of detection, and relates to a single-molecule protein detection method based on a microarray chip and a chemiluminescence immunoassay technology. An antigen-antibody complex reaction solution is randomly segmented into tens of thousands of microarray holes with the single-hole volume at the pL level by utilizing a microarray chip containing 0.5-200 thousands of micropores with the diameter of 5-30 [mu] m. Each micropore is used as an independent reaction unit for detection and comprises one or zero antigen-antibody compounds, a chromogenic substrate or exciting light is added to collect signal data in all the micropores, and the number of all the antigen-antibody compounds in a reaction system is directly and quantitatively detected according to a Poisson distribution calculation formula. And calculating the concentration of the antigen captured in the microarray chip. The method disclosed by the invention has the advantages of small background signal interference, high sensitivity, specificity, accuracy and precision, simplicity and rapidness in operation, low cost and obvious advantages in the technical field of single molecule detection, and the lower limit of detection reaches fg / ml.

The application provides a method and system for stress testing of an artificial intelligence system with a heterogeneous architecture. The method for stress testing of an artificial intelligence system with a heterogeneous architecture includes: performing statistics on historical test data of previous stress tests in a historical database to determine the correlation between test environments, test case types, fault modes, and test durations; generating a personalized test strategy for each of a plurality of test environments under test of the artificial intelligence system with a heterogeneous architecture under test based on the correlation between the test environments, the test case types, the fault modes, and the test durations; and performing stress testing on the plurality of test environments under test in parallel based on the personalized test strategy of each of the test environments under test.

The application provides a kind of pneumatic gas butterfly valve tightness test system, including gas generating device, import side pneumatic butterfly valve, gas heating device, export side pneumatic butterfly valve and waste gas treatment device;The gas generating device is connected by first pneumatic tee valve and main gas pipeline, and the waste gas treatment device is connected by second pneumatic tee valve and main gas pipeline;It also includes temperature sensor and first gas pressure sensor arranged at the gas outlet side of gas heating device, second gas pressure sensor installed at the air outlet of export side pneumatic butterfly valve and first smoke sensor installed on export side pneumatic butterfly valve.The beneficial effect: the test system generates gas by gas generating device, secondary heating and pressure regulating method to meet the strict test requirements.Test gas can be recycled multiple times by gas heating device and cooling device for multiple variable tests, reducing test cost and improving gas utilization rate.

This utility model discloses a PCBA production testing fixture, including a base, a tray, a backplate, a fan board slot, a main control board slot, a service interface board, and hand-tightening screws. The tray is located on top of the base and has threaded holes. The hand-tightening screws are used to secure the mainboard PCBA to the tray. A longitudinally arranged service card guide rail is provided on the front top of the base, allowing the service interface board to move longitudinally along the guide rail. A fan board slot and a main control board slot are provided on one side of the top of the base. A backplate is fixedly installed on the rear top of the base, and a backplate connector is fixedly connected to the backplate. Using this utility model, the mainboard PCBA can be assembled and disassembled without disassembling the backplate PCBA, fan, or main control board. No additional tools are required to assemble the mainboard PCBA. This invention greatly simplifies the assembly process during PCBA testing, reduces overall testing time, significantly improves production testing efficiency, and can meet the needs of mass production testing.