135results about How to "Save test space" patented technology

The invention relates to an indoor rock mechanics testing device, in particular to a rock hollow cylinder torsion shear apparatus capable of realizing complex stress path, and belongs to the technical field of geotechnical engineering techniques. The torsion shear apparatus comprises a base, a sleeve, a lower pressure head, an upper pressure head, a piston, an upper seat, a head cover, a connecting rod and a torsion device. The rock hollow cylinder torsion shear apparatus disclosed by the invention has the advantages that the puzzle that the stress path of the rock indoor testing device is single is solved; axial force, inner confining pressure, outer confining pressure and torque can be loaded on a rock sample separately or together; the defect that the four external forces interfere with one another during loading is overcome; the magnitude variation of principal stress or the rotating stress path of the principal axis of stress can be simulated; the rock hollow cylinder torsion shear apparatus is reasonable in structure, easy to manufacture, easy to operate, accurate in measuring system and high in automation degree and can be used for indoor tests of rock complex loading paths.

The invention discloses a pseudo-static test device which comprises a reaction wall (1) and a gate-type reaction frame (2). A main beam (3) of the gate-type reaction frame (2) is vertical to the wall surface of the reaction wall (1); the upper end of a vertical actuator (4) is connected with the main beam (3) through a spherical hinge (5), and the lower end is pressed on a distribution beam (9) parallel with the main beam (3). The pseudo-static test device also comprises an H-shaped steel beam (10), a water sac (11) and a columnar member to be tested (13) which are arranged under the distribution beam (9) in sequence. Two bending supports (7) are arranged under the columnar member to be tested (13) close to the two ends respectively. The pseudo-static test device also comprises an anchor rod (12), a steel baffle plate (14) and a horizontal actuator (6). One end of the anchor rod (12) passes through the steel baffle plate (14), and the other end is connected to a vertical channel in the reaction wall (1) through a bolt. The pseudo-static test device can test resistance-displacement full curves of beams and columns and the like under the combined actions of transverse uniform distribution load and axial force two loads.

The invention provides a handheld wave-absorbing material reflectivity measuring device. The handheld wave-absorbing material reflectivity measuring device comprises a metal test platform, a to-be-measured sample plate or a standard sample plate, a supporting cover, an arched guide rail, a near-field focusing antenna, a wave-absorbing partition plate, sliding blocks, a lifting rod, a push-pull rod and a receiving and transmitting module. According to the handheld wave-absorbing material reflectivity measuring device, the near-field focusing antenna which is a novel double-antipodal structure Vivaldi antenna replaces a horn antenna to serve as a receiving and transmitting antenna, the antenna is small in size and weight, and has the low standing-wave ratio in a wide band, the high gain and the low side lobe characteristic, a near-field linear polarization plane wave can be generated, the far-field radiation environment is simulated on a near field, a test area moves from an antenna far-field area to an antenna near-field area, and test space is reduced; due to reduction of the distance between the to-be-measured sample plate and the antenna, the to-be-measured sample plate can be more intensively irradiated through an electromagnetic wave, and the influence of background reflectance on the test accuracy is reduced; meanwhile, electromagnetic wave incidence and a reflection angle can be accurately adjusted, the accuracy of a receiving-and-transmitting antenna positioning angle is improved, and the complex rate of operation is reduced.

The invention relates to a device and a method for testing inside relative humidity of a cement base material (such as cement mortar, concrete and the like) during hydration. The inside relative humidity testing device consists of a temperature humidity sensor, a sleeve, a filter membrane, sealant and a conducting wire, wherein the temperature humidity sensor is connected with the conducting wireand then sleeved into the sleeve, the temperature humidity sensor is flushed with the top end of the sleeve, the sealant is poured into the bottom of a sensing chip of the temperature humidity sensorfrom the bottom end of the sleeve, and the waterproof ventilated hydrophobic filter membrane is covered at the top end of the sleeve and adhered to the side of the sleeve by the sealant. The testing method comprises the following steps: embedding the device in the middle part of the cement base material, introducing the conducting wire to the outside of a tested object, then pouring the concrete,connecting the conducting wire and a test module, and then directly reading the test module or connecting the test module to a computer for automatic monitoring. The device has small volume and high precision; the testing method is simple; and the device and the method are not only suitable for measuring the inside relative humidity of the cement base material (such as cement mortar, concrete andthe like) at each age, but also suitable for measuring the relative humidity under various different spaces and environments.

The invention discloses a high-pressure transducer testing system which comprises an upper computer part and a lower computer part electrically connected with a high-pressure transducer. The upper computer part comprises a human-computer interface module and a PLC (Programmable Logic Controller) module, and the lower computer part comprises a power unit module, a motor module, an input side module and an output side module which are sequentially and electrically connected. The testing system can universally support the debugging and the testing of the high-pressure transducer in the development process of the high-pressure transducer and directly detect the control algorithm and the effect of the high-pressure transducer to further ensure the testing safety, improve the testing efficiency and reduce the energy consumption.

The invention provides a test bed for automobile doors. The test bed comprises a mechanical actuator mechanism, an electric control system and a sensing unit respectively coupled to the mechanical actuator and the electric control system. The mechanical actuator mechanism can be arranged inside an automobile and comprises an attachment mechanism, a transmission mechanism, a fixed bracket, a lifting platform and a servo motor adapted to drive the transmission mechanism. The attachment mechanism is attached to an automobile door. One end of the transmission mechanism is coupled to the attachment mechanism. The other end of the transmission mechanism is coupled to the servo motor. The sensing unit comprises an angle sensor, a force sensor and a speed detection unit fixed on the surface of the automobile door. According to the technical scheme of the invention, the test bed for automobile doors occupies a small space, and is easy in installation and strong in flexibility. During the test process, the loss of a to-be-tested automobile door and a testing mechanism is effectively reduced.

The invention discloses an overall drawing test device for a mining anchor rod, relating to the field of mining anchor rod test and aiming at providing an adaptive test device for the mining anchor rod. The overall drawing test device for the mining anchor rod comprises a movable beam (1), a first guide rail (2), a drawing oil cylinder (3), a pull rod (4), an oil cylinder seat (5), a transverse beam (6), a front clamping head (7), a rear clamping head (8) and a pin shaft (9), wherein a first rolling wheel (10) capable of rolling along the first guide rail (2) is arranged on the movable beam (1); the oil cylinder seat (5) is fixedly connected to the transverse beam (6); a second guide rail (11) is paved on the transverse beam (6); and a row of first pin shaft holes (12) are arranged in the transverse beam (6). According to the overall drawing test device for the mining anchor rod, an overall drawing performance test function of the mining anchor rod is realized; and the overall drawing test device has the characteristics of simple structure and adjustability for test height.

The invention relates to a device and method for detecting spray droplet deposition uniformity of an agricultural drone. The device comprises one machine frame, an X-directional movement mechanism, aY-directional movement mechanism, a Z-directional movement mechanism, an objective table, a laser ranging module, an array cavity tray container and the other machine frame; in the field of pesticidespraying, the flight height and speed of the drone and the influence of a rotor wing wind field on drifting and depositing of droplets in air can be researched indoors by adopting the detecting deviceand a spray droplet deposition uniformity detecting method provided by the invention; moreover, test space can be saved, and the device and the method have the characteristics of rapidness and intuitiveness.

The invention discloses a device for detecting the luminous flux of a two-axis motion type lamp and belongs to the field of photometric detection. The technical scheme of the invention is as follows: the invention provides a device for detecting the luminous flux of a two-axis motion type lamp. The device comprises a lamp bracket, a wireless photometric probe, a polar angle motor, an azimuth car, a circular orbit, a motion controller, a monitoring computer, a left limit and a right limit, wherein the azimuth car comprises a groove-embedded roller, a gear, a connecter, an azimuth motor, and a photometric probe installation platform; the wireless photometric probe is driven by the polar angle motor to realize motion in the longitude direction, and driven by the azimuth motor to realize motion in the latitude direction; and the motion controller controls the motion positions of the polar angle motor and the azimuth motor according to instruction requirements of the monitoring computer, the wireless photometric probe returns an obtained illumination value obtained by test at each testing position back to the monitoring computer, and the monitoring computer after completing the calculation of spherical illumination integrations can accurately obtain the total luminous flux value of the lamp. The device disclosed by the invention is high in luminous flux testing accuracy, small in required darkroom space, simple in structure, convenient in maintenance and low in investment cost, accords with international standard requirements, and satisfies the needs of lamp production enterprises and third-party certification / authentication organizations in the aspect of detecting the luminous fluxes of lamps.

The invention discloses a sunk duct piece test platform which comprises a soil pit, a duct piece, a loading system and a control system, wherein the soil pit is an open-ended cylindrical concave pit dug and constructed underground; the duct piece is placed in the middle of the soil pit in a manner that the axis of the duct piece is vertical; the loading system comprises a string ring structure, a hydraulic cylinder group and two tensile hydraulic cylinders; the string ring structure is embedded into the internal wall of the soil pit; the hydraulic cylinder group comprises three rows of loading cylinders; each row of loading cylinders is provided with 16 hydraulic cylinders; one end of each hydraulic cylinder is connected with the external wall of the duct piece; the other end of each hydraulic cylinder is fixedly connected with the internal wall of the string ring structure; the hydraulic cylinder group loads the duct piece; one end of each tensile hydraulic cylinder is fixedly connected with the internal wall of the string ring structure; the other end of each tensile hydraulic cylinder is connected with the internal wall of the duct piece by an anchor rod and loaded on an anti-floating point of the duct piece; and the control system comprises a pump station, an upper and lower half-ring control component, a middle whole ring control component and an anti-floating point control component, is connected with the loading system and controls the loading system to load the duct piece. The platform saves the space, is easy and simple to operate, and can simulate an anti-floating condition of the duct piece, and a test result accords with the engineering practice.

The invention provides a functional circuit test system for a printed circuit board assembly, and is used in the technical field of tests in printed circuit board assemblies. The system comprises an impedance test gauge head, a relay group, a travel switch, a self-locking control circuit and a switching circuit, wherein the travel switch and the self-locking control circuit are directly connected with the impedance test gauge head respectively; the self-locking control circuit is connected with the switching circuit which is connected with a functional circuit test module; the travel switch is connected with a probe group of a pressing tool, and is used for judging whether the tested printed circuit board assembly and the probe group of the pressing tool are well pressed or not; and the impedance test gauge head is used for measuring and judging whether a measured impedance value of the tested printed circuit board assembly is in a proper range or not, transmitting a test passing signal when the measured impedance value is in the proper range, and transmitting a control signal to the self-locking control circuit to enable the self-locking control circuit to enter a self-locked state to switch the test system to the functional circuit test module.

The invention discloses a wind-power-controllable wind load testing device and method of a vehicle-mounted mast lifting system. A set equivalent wind power value is converted into a corresponding voltage signal to be sent to each proportional pressure-regulating valve, the size of an opening is regulated by using the proportional pressure-regulating valves, and furthermore, the pressure of an air cylinder is regulated, so that the thrust of the air cylinder can be continuously regulated; a movable pulley is pushed by a piston rod of the air cylinder, so that a tension is generated on a steel wire rope; the tension generated on the steel wire rope is acted on a multisection telescopic vehicle-mounted mast and a counter weight through a tension sensor, voltage values are transmitted to a computer through the tension sensor, all the voltage values are converted into corresponding tension values through the computer, and voltages are output through control and regulation, so that the actual tension value acquired by the tension sensor is gradually close to and up to the actually output wind power value; and a strain value of a strain foil is acquired in real time during test, so that the deformation and stress conditions of a mast during wind load test can be detected. By using the wind-power-controllable wind load testing device and method of the vehicle-mounted mast lifting system, the test space can be saved, the stroke of the piston rod can be reduced; and the testing precision can be improved, and different wind power detecting requirements can be met.

The invention discloses a cylindrical test specimen lateral dynamic uniform distribution load testing apparatus. The apparatus comprises a reaction wall (11), holders (9), a steel baffle (8), an anchor arm (7) and a horizontal actuator (12). One end of the horizontal actuator (12) is fixed at the reaction wall (11), and the other end of the horizontal actuator (12) abuts against one end of a test specimen (6) close to the reaction wall (11). The apparatus further comprises a door-type guide rail (1) perpendicular to a foundation plane (10), a weight-bearing beam (2) capable of falling free along the door-type guide rail (1), a drop hammer (3) fixedly connected to lower middle part of the weight-bearing beam (2), a water bag (5) on the upper portion of the test specimen (1), and a steel distribution beam (4) above the water bag (5). The apparatus is capable of testing the dynamic response characteristics of beams, columns and other cylindrical test specimens under interaction of transverse uniform dynamic load and axial force.

The invention belongs to the technical field of power system communication, relating to a laboratory icing simulating test method of optical power ground wires (OPGWs), which can simulate and test the performance changes of running lines in various icing thicknesses states in a laboratory. The method carries out an experimental comparative study on the electrical properties, the communication andthe mechanical properties of the OPGWs under an icing condition by utilizing a laboratory icing simulating test system, mainly carries out the experimental studies on lightning resistance, short-circuit current, attenuation, tensile strength, stress strain and the like on the OPGWs with different structures, types, technical parameters, materials and the like and then determines a comprehensive solution on resistance of the OPGWs on icing disasters through analyzing test data.

The invention provides a terrain transformation and reconfigurable comprehensive test device and a test method. The test device includes a load-bearing base and a plurality of test units arranged and fixed on the load-bearing base; each test unit includes a test shell and is used to adjust the test shell. The height adjustment mechanism of the body; the cross-section of the test shell is polygonal, the sides of adjacent test shells are in close contact, and the upper surfaces of each test shell are spliced ​​to simulate terrain and road surface. After constructing a test device with a certain scale, it is only necessary to use the surface function model established according to the terrain characteristics, select the position coordinates (X, Y) of the test shell, calculate and obtain the height Z of the test unit, and adjust the height of each test unit to obtain Simulated terrain with different surface characteristics. The transformed and reconstructed terrain and pavement basic data can be recorded and verified. Therefore, the test device does not need to be rebuilt, the universality of the test device is improved, and the test site and test funds are saved.

The invention discloses an infrared-thermal-imaging-based continuous component bulk high-flux multi-field screening device and method, the device includes a control center, an experiment box, a loading platform, a temperature control module, a current control module, a vacuum generation device and an infrared thermal imaging system. In an experiment, different field excitations are inputted, according to different material characteristics, the upper surface of a to-be-detected sample has different temperature responses. Thermal radiation information of all sample surfaces is parallelly acquired. Color of each block of sample in a corresponding region in a thermal radiation energy image is identified by visual inspection to obtain temperature information. A temperature response curve of each block of sample is generated. According to a mathematical model of the test system, the physical characteristics of the material are calculated, and then screening results are obtained.

The invention relates to an external deformation fatigue test loading device for a web clearance plane between a vertical stiffening rib and a wing plate. Two ground anchors for fixing a test piece are oppositely arranged on a concrete leveling layer. The test piece is connected with a loading beam through a connecting assembly. The loading beam is an H-shaped beam. The middle of an upper flange plate is connected with a servo hydraulic actuator. According to the external deformation fatigue test loading device, the test piece is fixed to the ground anchors through high-strength bolts, the servo hydraulic actuator provides two concentrated cyclic loads for the web vertical stiffening rib through the loading beam and the connecting assembly, and the acting force of a cross strut in a steel plate girder bridge on the web stiffening rib can be truly simulated; in addition, due to reasonable simplification, the scale of the test piece is reduced, the test space is saved, the structure is simplified, the requirement for loading shipping tons is reduced, the test piece is high in replaceability and easy to disassemble, a large number of variable parameter tests can be conveniently and economically carried out, and the application prospect is wide.

The invention discloses a fatigue testing device of a damping pad. The fatigue testing device comprises a temperature box, a left fixing plate, a load bearing plate and a right fixing plate are arranged in the temperature box at intervals from left to right, multiple supporting rods are penetratingly arranged at the edges around the left fixing plate, the load bearing plate and the right fixing plate at intervals, a dynamic load hydraulic actuator is fixedly arranged on the right side wall of the left fixing plate and connected with a dynamic load force sensor which is connected with the left side wall of a dynamic load pressurizing plate, a static load pressurizing plate is arranged exactly on the right of the dynamic load pressurizing plate, and the damping pad is placed between the static load pressurizing plate and the load bearing plate; a static load hydraulic actuator is arranged on the left side wall of the right fixing plate and connected with a static load force sensor, and the left end of the static load force sensor is connected with the static load pressurizing plate. By the fatigue testing device, test operating personnel can conveniently and reliably test temperature stress and fatigue load of the damping pad, and testing cost is lowered remarkably.

The invention provides a test system and a test method of a wireless network device, relates to the test technology of network devices, and particularly relates to parallel test technology of wireless network devices. The test method of the wireless network device comprises the following steps: S200: a test platform coordinates first and second testers to alternately test transmitter radio frequency parameters of a first frequency wireless port and a second frequency wireless port of the tested wireless network device in turn; and S400: the test platform coordinates the first and second testers to alternately test receiver radio frequency parameters of the first frequency wireless port and the second frequency wireless port of the tested wireless network device in turn.

The invention relates to an outer-of-face deformation fatigue test loading device for a web gap at the position of steel bridge horizontal gusset plates. The outer-of-face deformation fatigue test loading device is characterized in that two opposite concrete leveling layers are provided with ground anchors for fixing a tested piece respectively, the two force-transmission horizontal gusset plates are arranged on the tested piece in parallel and connected with a loading beam through connecting assemblies, the loading beam is an I-shaped beam, and a servo hydraulic actuator is connected to the middle of an upper flange plate of the loading beam. According to the outer-of-face deformation fatigue test loading device, the tested piece is fixed to the ground anchors through high-strength bolts, the servo hydraulic actuator provides two concentrated cyclic loads for the force-transmission horizontal gusset plates through the loading beam and the connecting assemblies, the true stress of the position of the web gap of the tested piece at the position of the horizontal gusset plates is simulated, and the fatigue testing result is accurate; due to the fact that the scale of the tested piece is reasonably simplified and reduced, testing space is saved, and the requirement for the loading tonnage is lowered; in addition, the tested piece is high in replaceability and easy to disassemble, a large number of tests for variable parameters can be conveniently and economically carried out, and the application prospects are broad.

An airplane body wallboard pressurizing test device relates to the technical field of airplane strength test device designing. Long bottom beams are parallely and fixedly arranged on a same plane. Short bottom beams are fixedly arranged on the long bottom beams and are perpendicular with the long bottom beams; a square steel frame is fixed on the short bottom beams and furthermore the shape of the square steel frame matches a supporting bottom box. Each connecting part comprises a small pulling plate, a middle pulling plate, a large pulling plate, a long pulling plate, double ears, a load equalizer and a single ear; wherein the small pulling plate, the middle pulling plate, the large pulling plate, the long pulling plate, the double ears, the load equalizer and the single ear are successively connected. A tested member covers and presses the supporting bottom box, and furthermore the tested member is connected with a supporting part through the connecting part. The tested member is connected with a hydraulic servo control device and inflates the tested member for realizing a pressurizing test on the airplane body wallboard. The airplane body wallboard pressurizing test device provided by the invention has advantages of saving testing space, reducing weight of the test device; effectively ensuring uniform load bearing in an adaptive loading manner; reducing a connecting process, effectively increasing loading frequency, realizing uniform boundary load, saving space and realizing repeated use.

The invention relates to the related field of airplanes, in particular to a ground verification test method for simulating catapult-assisted take-off impact response during catapult-assisted take-offof an airplane. The ground verification test method for simulating the catapult-assisted take-off impact response during the catapult-assisted take-off of the airplane comprises the steps of selectingone section from an airframe structure as a ground verification test piece and an airframe test section according to a main force transmission path of catapult load of a carrier plane; placing overload sensors and bonding strain sensors on the main force transmission paths and key parts of a landing gear and the airframe structure; arranging laser displacement sensors; fixedly restricting the rear end of the test piece on a force bearing wall; and placing a rubber pad at the wheel center of the landing gear to restrict the vertical downward displacement of the test piece in the load applyingprocess. According to the ground verification test method for simulating the catapult-assisted take-off impact response during the catapult-assisted take-off of the airplane, as the main airframe structures on the front landing gear and the main force transmission paths are used as test pieces, the scale of the test pieces is greatly reduced, and the design and manufacturing cost is reduced. Through coordinated loading of multi-passage oil cylinders, the correctness of the load in the whole catapulting process is guaranteed.

The invention relates to a removable rocking plate type wave generation system applicable to a low temperature towed ice water pool. The system comprises at least one wave generator, vertical brackets, horizontal brackets, rail supporting seats and rails. Each wave generator includes a rocking plate, pendulum shafts, a servo drive system, a sealing box, and a pool bottom foundation steel frame. For each wave generator, the servo drive system is placed in the sealed box; the two rocking plate pendulum shafts are connected with an output shaft of a double-output shaft reducer respectively through couplings; the rocking plate pendulum shafts extend out of the sealing box through sealing interfaces and are connected with bearings fixed on the foundation steel frame; and the servo drive system swings by driving the rocking plate with the pendulum shafts. The pool bottom foundation steel frames of the adjacent wave generators are fixedly connected to ensure the concentricity of the pendulum shafts of each wave generator. The foundation steel frames of the wave generators at the two sides and adjacent to the wall position of an ice water pool are respectively fixedly connected to the vertical brackets, the rails and the rail supporting seats are respectively fixed to upper portions of the two side walls of the ice water pool, and the vertical brackets are connected to the rail supporting seats through the horizontal brackets.

The invention relates to a three-dimensional self-control plant aerial fog cultivation apparatus with a novel temperature and light uniformizing control function. The three-dimensional self-control plant aerial fog cultivation apparatus comprises a three-dimensional planting barrel, a nutrient solution supply system, a light uniformizing rotary system, a temperature control system and a humidity control system; the fixing end of the light uniformizing rotary system is fixedly arranged relative to the ground, and the three-dimensional planting barrel is fixed on the rotary end of the light uniformizing rotary system; and the three-dimensional planting barrel comprises at least one planting space for planting and researching plants, the temperature control system and the humidity control system are respectively used for controlling the temperature and the humidity in the planting space; and the temperature control system comprises a temperature controller, a fan and a wet curtain arranged in the planting space, the temperature controller is electrically connected with the fan, and air currents generated by the fan pass through the wet curtain.

The invention discloses an SCAR markerer of a sorghum head smut resistance germ No. 3 physiological strain, which takes 7050B which is immune to head smut, Tx622B which is high sensitive to the head smut and F2 hybridized by Tx622B / 7050B as test pieces and adopts a BSA method to make a molecular marker on a sorghum head smut resistance gene by applying an RAPD (Random Amplified Polymorphic DNA) screening technology. The invention establishes and optimizes a sorghum RAPD reaction system to obtain three RAPD markers of S18799, S336-11419 and S336-2716 which are tightly interlocked with the sorghum head smut resistance gene, also converts the S18799, the S336-11419 and the S336-2716 to stable SCAR markerers and uses the markers to carry out rapid PCR (Polymerase Chain Reaction) detection on the F2 generation and a part of sorghum resistant varieties and finds out a molecular marker specific band from the resistant varieties, thereby establishing an SCAR markerer rapid PCR detection method of the sorghum head smut resistance germ No. 3 physiological strain, supplying a basis for molecular marker assisted breeding and providing the technical support for practicing the molecular marker assisted breeding and shortening the breeding period.

The invention provides a high-temperature and high-humidity reverse bias test system and method for a semiconductor device. In the test system and the test method, a protective tube is arranged outside a test box; the special protective tube can be replaced by an ordinary protective tube; therefore, the test cost is easily reduced; furthermore, a test space occupied by the protective tube in the text box is reduced; therefore, more test stations can be easily provided in the test box; and the batch test efficiency is increased.

A built-in online dynamic balance device test bed for a main shaft comprises an electric spindle fixed on a vibration isolation damping workbench through an electric spindle base. The front end of theelectric spindle is connected with a rear flange connecting piece through a knife handle connecting piece, and the rear flange connecting piece is flexibly connected with a front flange connecting piece arranged at the rear end of a driven shaft. The driven shaft is fixed to a base through a front bearing support and a rear bearing support, and the base is fixed on the vibration isolation dampingworkbench. The front section of the driven shaft is provided with a built-in hole for installing an online dynamic balance device, and a threaded hole used for mounting the front flange connecting piece is formed in the rear section of the driven shaft. Counterweight threaded holes are uniformly distributed in an unbalanced simulation plate arranged on the outer side of the middle of the driven shaft, and the mass distribution of the unbalanced simulation plate is changed through installation of screws. The simulation of unbalanced vibration is carried out. The test research requirements of abuilt-in online dynamic balance device can be completely met, and the built-in online dynamic balance device test bed is convenient to construct.

The invention discloses a piece of vertical test equipment for electronic assemblies, comprising a box body assembly, a plurality of first main board assemblies and a processor. The first main board assemblies are disposed in the box body assembly. Each first main board assembly comprises a main board, a first main socket, an adapter plate, a first sub socket and a central processor. The main board is vertically disposed in the box body assembly. The first main socket is disposed on the main board and electrically connected to the main board. The adapter plate is electrically connected to the first main socket and substantially vertical to the main board. The first sub sockets are disposed on the adapter plate. The central processor is disposed on the main board and electrically connected to the main board. The processor plugs a plurality of electronic assemblies in the first sub sockets along a vertical direction to perform a test respectively, and plugs out the electronic assemblies after the test is finished.