181results about How to "Improve experimental efficiency" patented technology

This application belongs to the field of scanning probe microscopy technology, and particularly relates to a transverse scanning tunneling microscope and a scanning imaging method. The scanning tunneling microscope body includes a base, a first piezoelectric tube, a guide rail, a scanning imaging unit, and a sample stage. The fixed end of the first piezoelectric tube is fixedly mounted on the base; the free end of the first piezoelectric tube is fixedly connected to the lower surface of the guide rail. The sample stage is perpendicular to the guide rail and fixedly mounted at one end of the upper surface of the guide rail. The scanning imaging unit is placed on the upper surface of the guide rail. A probe is provided on the scanning imaging module, with the probe tip pointing towards the sample fixed on the sample stage. The scanning imaging unit drives the probe to perform insertion, retraction, or scanning imaging relative to the sample stage while the magnetic field direction is parallel to the sample surface. This application enables efficient scanning imaging of the sample surface when the magnetic field direction is parallel to the sample surface.

The utility model discloses a hydrochloric acid ammonia gas corrosion test case relates to test case technical field, including test case main part, support seat, waste gas treatment tank, support seat top both sides are connected with test case main part and waste gas treatment tank respectively. The utility model discloses a ammonia gas injection pipe and hydrochloric acid injection pipe inject proper amount of ammonia gas and hydrochloric acid gas into test case main part, wherein the hydrochloric acid conduit and ammonia gas exhaust pipe correspondingly connected of ammonia gas injection pipe and hydrochloric acid injection pipe are upside down distribution in test case main part, are favorable to the full mixing of hydrochloric acid gas and the ammonia gas below, form even corrosive gas environment, this can ensure that the corrosion effect that each part in test case receives is more consistent, thereby obtains accurate test result, wherein the test case main part inner wall has been daubed anticorrosive layer coating), can effectively prevent the corrosion of hydrochloric acid and ammonia gas to test case main part inner wall.

The utility model provides a kind of dissolving aid mixing and feeding device, wherein: dissolving aid storage box bottom is equipped with the storage box blanking plug-in board of being able to pull out, the lower part of storage box blanking plug-in board is equipped with dissolving aid subpackaging box;Dissolving aid subpackaging box is equipped with the longitudinal lifting adjusting base plate that can longitudinally slide, with slide between the two, dissolving aid subpackaging box has longitudinal slit, the handle of longitudinal lifting adjusting base plate outwardly extending is equipped with longitudinal slit sealing strip in both sides, longitudinal lifting adjusting base plate moves longitudinally;Turnover device is connected with multiple dissolving aid subpackaging boxes, and the below of guide tube outlet is equipped with a material cup.The utility model has the advantages that: solve the present carbon sulfur analysis instrument dissolving aid manual addition each time and cannot be fixed, easily cause the fluctuation of experimental blank, influence the accuracy and precision of experiment, manual operator workload increases, the shortcomings, such as low experimental efficiency, relatively simple structure, low in cost, experimental blank is stable, improves experimental efficiency and accuracy.

The utility model discloses an animal fixing device for experiments, relates to the technical field of medical experiments, and solves the problem that an animal cannot be turned over quickly and conveniently while being fixed by the conventional animal fixing device. The operation panel and the telescopic frame are arranged in the box body, one end of the operation panel is hinged to the box body through a pin shaft, the operation panel is provided with a protrusion, the box body is provided with a groove, the protrusion is matched with the groove, the operation panel is provided with a through groove, the telescopic frame is connected with the through groove in a sliding mode, and the telescopic frame is connected with the through groove in a sliding mode. According to the utility model, the experimental part of the experimental animal can be simply and quickly changed, the operation of personnel is convenient, and the efficiency can be improved.

The application belongs to the technical field of medicine, and particularly relates to a method for embedding micro-organoids or cells with agarose. The method for embedding micro-organoids or cells with agarose comprises the following steps: 1) fixing micro-organoids or cells with a fixing solution; 2) washing the fixed organoids or cells, removing supernatant after centrifugation, and obtaining organoid or cell precipitate; 3) pre-embedding organoids or cells with agarose; 4) taking out the agarose pre-embedded organoids or cells after demolding, and transferring the agarose pre-embedded organoids or cells to an embedding box, and sequentially performing ethanol gradient dehydration, transparent treatment and paraffin wax immersion treatment on the sample according to a specific procedure; and 5) paraffin embedding. Compared with the prior art, the application has the following beneficial effects: improving organoid / cell density; by agarose embedding, reducing the relative dispersion volume of organoids / cells, significantly improving the density of the sample in the slice, facilitating observation and detection, and having good detection effect.

The utility model discloses a nitric acid preparation device for simulating an early atmospheric photochemical reaction of the earth. The nitric acid preparation device comprises an ultraviolet photochemical reaction system, a reaction gas source feeding system, a water vapor generator and a nitric acid freezing collector, the ultraviolet photochemical reaction system comprises an ultraviolet light source and a reaction chamber, and the ultraviolet light source is used for providing ultraviolet light required by reaction into the reaction chamber; the reaction gas source supply system is communicated with the reaction chamber and is used for supplying gas required for generating nitric acid through ultraviolet light chemical reaction into the reaction chamber; the water vapor generator is used for providing water vapor for the reaction chamber; the water vapor generator is connected with the reaction chamber; the nitric acid freezing collector is connected with the reaction chamber and is used for collecting nitric acid generated by photochemical reaction in the reaction chamber. The utility model realizes the preparation of nitric acid by simulating the early atmospheric photochemical reaction of the earth.

The invention discloses a transient absorption spectrum scanning data validity control and sample state determination method and system, and the method comprises the steps: obtaining a two-dimensional data matrix of multiple times of scanning, carrying out the time zero point alignment and intensity normalization preprocessing, extracting a spectrum vector at a key delay time point, and calculating the spectrum shape similarity to determine the spectrum shape consistency, and constructing a dynamic proportion parameter in a sentry band to judge dynamic trend consistency, and marking abnormal scanning and executing a processing strategy according to the results of the dynamic proportion parameter and the dynamic trend consistency. According to the invention, objective determination of validity of scanning data is realized, spectral distribution form and dynamic behavior change are described, real-time abnormity determination and control in an experiment process are supported, and reliability and repeatability of an experiment result are improved.

The utility model relates to corrosion -resistant microtube heat measurement technical field discloses a kind of corrosion -resistant microtube heat measurement devices of constant power drive, including measuring instrument, the controller is arranged in measuring instrument side wall, the connecting pipe is fixedly connected in measuring instrument side wall, the microtube body is slidably connected in the connecting pipe inside, the card slot one is set in the microtube body inside, the dismounting assembly is arranged in the connecting pipe inside;The dismounting assembly includes trapezoidal clamping post, the trapezoidal clamping post is slidably connected in the connecting pipe inside, the trapezoidal clamping post is engaged with the card slot one. In the utility model, by sliding sleeve driving groove moves, groove moves and trapezoidal clamping post is separated from card slot one, then microtube body is separated by sliding in connecting pipe, and then microtube body can be quickly replaced, so as to reach the effect that microtube is conveniently replaced, the problem that traditional device microtube replacement is complicated is solved, and the operation flexibility and experimental efficiency of device are improved.

The invention belongs to the technical field of coal rock mechanical property testing, particularly relates to a mechanical testing device and method for coal rock loading, and solves the problems that an existing device is single in function, fragments splash, cleaning is inconvenient, and protection and cleaning are not linked. The device comprises a supporting mechanism, and a modular loading mechanism is detachably mounted on the supporting mechanism and comprises a static extrusion loading module and a dynamic impact loading module; the linkage type protection mechanism is provided with two protection half barrels, and fragments can be prevented from splashing when the two protection half barrels are closed; the sweeping mechanism is started when the protective half barrels are unfolded, a rotating ring drives a Z-shaped plate to rotate, an annular inclined panel is driven to vibrate, and fragments are swept; the device integrates a static extrusion function and a dynamic impact function, so that the equipment utilization rate and the application range are improved; protection and cleaning are linked, safety is guaranteed, cross contamination is avoided, and the experiment accuracy and efficiency are improved.

The invention is suitable for the technical field of fluid mechanics experiments, and provides a Tesla valve visualization experiment device and method based on semiconductor heating and cooling, and the device comprises a Tesla valve heat dissipation plate, a fluid supply and vacuum system, a heating, cooling and temperature control module, a data acquisition and visualization module, a supporting and fixing module and a power supply module. A valve body structure formed by combining an acrylic plate and a copper plate engraved with a Tesla valve runner is matched with a high-precision high-speed camera, so that the real-time visual observation of the flowing state of fluid in the Tesla valve is realized. According to the invention, visualization of the Tesla valve flow channel experiment is realized, the flowing form of fluid in the Tesla valve flow channel can be clearly presented, the Tesla valve performance verification method is suitable for Tesla valve performance verification under different structure parameters, different fluid media and temperature conditions, and reliable experiment support is provided for structure optimization and application expansion of the Tesla valve.

The utility model relates to the technical field of medical instruments, in particular to a special clamping and connecting mechanism for a dental handpiece diagnosis and treatment in-vitro simulation platform. According to the technical scheme, the dental handpiece comprises a platform body, a shaft fixing base and a dental handpiece body, a sliding base is arranged on the platform body in a front-back sliding mode, the shaft fixing base is arranged on the sliding base in a left-right sliding mode, and the dental handpiece body is arranged on the shaft fixing base through a positioning assembly. The positioning assembly adopts an upper and lower double-clamping fixing design, so that the clamping coaxiality of a machine needle of the dental handpiece body can be ensured, and the positioning assembly consists of a handpiece left fixing clamp, a special connector, a handpiece right fixing clamp, a shaft fixing top seat and a positioning shaft. According to the utility model, an upper and lower double-clamping structure is adopted, so that the stability of the dental handpiece body during high-speed operation is enhanced, and looseness is prevented; the positioning assembly is precise, the clamping coaxiality of the machine needle is ensured, and the experimental error is reduced; the specially-made connector is provided with a customizable arc surface and a customizable round concave part, so that the connector is adaptive to various mobile phone models.

The application provides a gold mine rolling bottle leaching experiment system and experiment method, relates to the hydrometallurgy technical field, and the system comprises: the central controller and the multi-axis mechanical arm which are electrically connected; the central controller is used for obtaining and analyzing a preset experiment task to obtain a job instruction sequence; according to each job instruction, a control signal is sent to the multi-axis mechanical arm; the multi-axis mechanical arm is used for grabbing a rolling bottle to a weighing platform when receiving an empty bottle grabbing signal; according to a solid sample adding signal, a sample adding speed is determined, and the gold mine powder is added to the rolling bottle at the sample adding speed; when receiving a first moving signal, the rolling bottle is transported from the weighing platform to a liquid sample adding station; when receiving a liquid sample adding signal, the rolling bottle is injected with acid and alkali liquid; when receiving a cap screwing signal, the rolling bottle is transported to a cap screwing station and is sealed by screwing a cap; when receiving a second moving signal, the rolling bottle is transported to a preset clamping position of a rolling bottle machine to realize rolling bottle leaching. The application improves the experiment efficiency of the gold mine rolling bottle leaching experiment.

This invention discloses a thread friction coefficient testing machine, including a test drive unit, a main base, a pad, and a detachable fixture. The fixture includes an assembly base, a clamping actuator with an anti-rotation groove, and a circumferential locking pin, the tail end of which protrudes from the base. When the threaded pair slips, the locking pin is removed and the clamping actuator is rotated from the outside, allowing the fixture, along with the internally jammed fasteners, to be removed as a whole without destructive operation. This design not only achieves non-destructive and rapid unloading of the threaded pair, but its protruding clamping end and axial adjustment hole also expand the equipment's ability to test the friction coefficient of short bolts, significantly improving the maintainability, operating efficiency, and testing applicability of the equipment.

The invention provides a magnetic resonance compatible multispectral fluorescence mesoscopic imaging system, which comprises a fixing device located in a magnetic resonance cavity of magnetic resonance equipment and used for fixing an experimental object to be observed; the optical equipment comprises a light emitter, a light collector and a light conduction assembly, the light emitter is used for emitting light rays of at least two different wave bands, the light rays emitted by the light emitter are used for exciting fluorescence in an experiment object, and the light emitter and the light collector are both located outside the magnetic resonance cavity; and the computer is used for producing images. The system can realize synchronous acquisition of magnetic resonance imaging and multispectral mesoscopic fluorescence imaging when an experimental subject is in a waking state.

This utility model relates to the technical field of pipette holders, and discloses a pipette holder including a base. A rotating rod is rotatably connected to the top of the base, and a rotating handle is fixedly connected to the top of the rotating rod. A fixed plate is fixedly connected to the outer top side of the rotating rod. Multiple guide blocks are fixedly connected inside the fixed plate, and protective sleeves are fixedly connected to the bottom of each guide block. A pipette assembly is disposed inside the protective sleeve. A rotating disk is fixedly connected to the bottom of the rotating rod, and multiple slots are formed inside the rotating disk. A fixed ring is fixedly connected to the inner right side of the base, and a sliding groove is formed on the inner bottom side of the fixed ring. With this utility model, users no longer need to search among numerous pipettes; they can quickly rotate the required pipette to a convenient position, greatly saving operation time and improving experimental efficiency.

The application discloses a kind of live wire electric fire simulation experiment device, including power supply, sliding rheostat, mounting bracket, experimental live wire and sensor;Power supply, sliding rheostat, experimental live wire are sequentially connected in series;Mounting bracket includes balance, the top of balance is fixed with two mounting seats, two mounting seats are slidably sleeved with stand, two stands are fixed with wire fixing mechanism, experimental live wire is detachably installed on stand by wire fixing mechanism;One stand is fixedly installed with insulation layer cutting mechanism, another stand is fixedly installed with wire changing mechanism, two wire fixing mechanisms are arranged between insulation layer cutting mechanism and wire changing mechanism. When using the application to carry out live wire fire simulation experiment, it is not necessary to manually replace the experimental live wire, and the operation is simple, which helps to improve the experimental efficiency.

The application discloses a transverse stepped gap groove clamp for a classical four-point bending experiment, which comprises an upper clamp, a lower clamp and a positioning connecting piece, standard installation through holes are arranged on the upper clamp, the lower clamp and an experimental sample, the positioning connecting piece passes through the standard installation through holes to realize the connection of the upper clamp, the experimental sample and the lower clamp, stepped gap groove arrays are arranged on working surfaces of the upper clamp and the lower clamp in contact with the experimental sample, the stepped gap groove array comprises a plurality of grooves arranged along the length direction of the upper clamp and the lower clamp, the depth of the groove is arranged along the height direction of the upper clamp and the lower clamp, the depth of the groove is increased or decreased along the length direction of the experimental sample according to a preset gradient, and the height of the groove is arranged along the thickness direction of the upper clamp and the lower clamp. The application can meet the requirement that the four-point bending experiment cannot realize high-throughput gap simulation in a stress corrosion environment, and is used for improving the accuracy, reliability and efficiency of the experiment.

The present application belongs to the field of chemical detection and analysis, and particularly relates to a quantitative analysis method of tire surface spray substances. The quantitative analysis method of tire surface spray substances comprises the following steps: S1. establishing a standard curve; S2. pretreating a to-be-tested sample; S3. qualitatively analyzing the to-be-tested sample; S4. calculating the concentration of 6PPD in the to-be-tested sample; and S5. quantitatively analyzing each component of the to-be-tested sample. The present application provides a reasonable and rapid quantitative analysis method of tire surface spray substances, which can more effectively qualitatively and quantitatively analyze tire surface spray substances, provide basic data basis for optimizing a formula and adjusting a process, save unnecessary multiple formula and process adjustment tests, and improve experimental efficiency.

The application discloses an experimental testing device and a testing method suitable for high-temperature lead-bismuth erosion, and belongs to the technical field of nuclear energy experimental testing devices. The device comprises a variable frequency motor, a motor support, a main shaft, a stuffing box, a shaft seat, a flange cover, a tank body, a mounting base, a test piece disc and a medium rotation prevention device. The output shaft of the variable frequency motor penetrates through the top cover of the motor support, the upper end of the main shaft is connected with the output shaft of the variable frequency motor through an elastic column pin coupling, and the stuffing box and the shaft seat are sleeved on the outside of the main shaft. The lower part of the motor support is detachably connected with the shaft seat, the shaft seat is detachably connected with the top of the flange cover, the flange cover is detachably connected with the top of the tank body, and the tank body is welded on the mounting base. The lower end of the main shaft extends into the tank body, and three test piece discs are arranged at equal intervals in the tank body, and test pieces are detachably installed on the test piece discs. The medium rotation prevention device is embedded in the tank body. The top edge of the tank body is connected with a protective gas inlet and a protective gas outlet, and the bottom is provided with a lead-bismuth medium inlet and outlet.

The invention discloses an ultra-low temperature vacuum system of a Tokamak or star imitator adaptive to nuclear fusion, and relates to the technical field of nuclear fusion equipment, the ultra-low temperature vacuum system comprises a vacuum chamber, a plasma state sensor is embedded in the inner wall of the vacuum chamber, the outer end of the vacuum chamber is provided with a sealing interface, the outer end of the sealing interface is provided with a primary filter, and the primary filter is provided with a secondary filter. A getter bin is installed at the outer end of the primary filter, an auxiliary pump is installed at the outer end of the getter bin, a stop valve is installed at the outer end of the auxiliary pump, a cold trap is installed at the outer end of the stop valve, the side wall of the cold trap is connected with a refrigerating machine through a pipeline, and a main pump is installed at the outer end of the cold trap. By arranging a series of structures, the pain point of decoupling of a traditional system and plasma operation is thoroughly solved, all the components cooperate to guarantee the ultrahigh vacuum environment, interference of impurity gas on plasma constraint is greatly reduced, and the stability and success rate of a nuclear fusion experiment are remarkably improved.

The application is a kind of simulation field drilling experimental device and experimental method for hydrate drilling fluid, which comprises a multilayer experimental cylinder, a water depth environment simulation device, a drilling running device, a drilling fluid feeding device, a slurry returning device and a data acquisition system. The multilayer experimental cylinder comprises at least two cylinder sections, and each cylinder section is independently configured with rock layers to simulate various formation environments. The water depth environment simulation device injects pressure into the multilayer experimental cylinder to simulate the environmental pressure of water depth. The drilling running device simulates downhole drilling. The drilling fluid feeding device is used to circulate and inject drilling fluid into the multilayer experimental cylinder through a drill pipe and a drill bit. The slurry returning device is used to circulate and return the drilling fluid to the drilling fluid feeding device and evaluate the hydrate content in the returned fluid. The application simulates the temperature and pressure environment of offshore gas field with low temperature and high pressure in the laboratory experimental device, and sets different rock layer compositions and experimental conditions of hydrate content, which can optimize the formula of drilling fluid and reduce the risk of hydrate generation during drilling.

The utility model discloses a hydrostatic test tool for a conductive copper pipe, which relates to the technical field of hydrostatic tests for conductive copper pipes and comprises a support structure and a test mechanism. The test mechanism comprises a lifting seat, a connecting piece, a first sealing piece, a second sealing piece, a lifting assembly and a moving assembly; a supporting plate, a supporting rod, a clamping piece, a clamping block, a limiting block, a limiting rod and a limiting spring can support and limit a conductive copper pipe, and a hydraulic cylinder, a moving rod, a second rack, a second gear, a first gear, a first rack, a lifting rod and a guide rod control a first sealing piece and a second sealing piece through a lifting base to adjust the height. The driving motor, the bevel gear structure, the lead screw transmission device and the connecting piece control the first sealing piece and the second sealing piece to seal the conductive copper pipe, hydrostatic tests can be rapidly carried out on different conductive copper pipes, and the test efficiency of the hydrostatic test tool is improved.

The utility model discloses an intermittent single-layer wet screening device for a laboratory. The intermittent single-layer wet screening device comprises a screen up-down vibration driving device and a water tank horizontal movement driving device, the water tank horizontal movement driving device comprises a water tank, a supporting arm, an underflow valve, a base, a water tank cover plate and a rotating motor; the screen up-down vibration driving device comprises a vibration motor, a cross beam, a vertical arm, a screen bottom support and a screen cover plate. Manual ore screening can be simulated, so that manual wet screening adopted in a current experiment can be replaced, manpower is effectively saved, and experiment efficiency is improved.

The application relates to the technical field of scroll tube, in particular to a sand blasting device for scroll tube experiment, which comprises a base, a first motor is installed in the base, a rotating disc is rotatably arranged on the base, an output shaft of the first motor is connected to the rotating disc, a blanking groove is arranged on the rotating disc, at least two blanking grooves are arranged at intervals, a discharge pipe is fixedly connected to the base, an air inlet pipe is connected to the peripheral wall of the discharge pipe, a suction pipe is connected to one end of the discharge pipe, one end of the suction pipe is located above the rotating disc, a pressing plate is fixedly connected to one end of the suction pipe, one side plate surface of the pressing plate is attached to the rotating disc, a blanking hopper is fixedly connected to the base, the bottom of the blanking hopper is attached to the rotating disc, a blanking opening is arranged in the bottom of the blanking hopper, the sand blasting experiment of the scroll tube can be conveniently carried out, and the experimental efficiency is improved.

This invention discloses a vascular organ-on-a-chip that simulates human blood pressure, comprising a substrate, a channel layer, a cell dynamic culture module, a solution mixing module, and a cell mechanical property measurement module. The cell dynamic culture module includes a first culture channel and a second culture channel, with a serpentine channel connecting the upstream of the first culture channel and the upstream of the second culture channel. The solution mixing module includes two oppositely arranged solution mixing channels, which are respectively connected to the first culture channel and the second culture channel. The cell mechanical property measurement module includes multiple measurement channels arranged side-by-side, with one end of each measurement channel connected to the other end of one solution mixing channel and the other end connected to the other end of another solution mixing channel. This invention simulates the human blood pressure environment within the vascular organ-on-a-chip, enabling simultaneous cell culture under parallel gradient pressure within the chip, and combining the vascular organ-on-a-chip with cell mechanical property measurement.

The application discloses a device and method for preventing pollution and blockage of a cold stage system of a scanning electron microscope, the device comprising a main low-temperature gas path system and a normal-temperature nitrogen branch, low-temperature nitrogen discharged from the main low-temperature gas path system is divided into two paths, and is respectively connected to a cold hydrazine and a cold stage and is independently controlled through a flow valve. In order to solve the problems that a sample is easily polluted and a gas path is easily blocked during temperature rising in the prior art, a normal-temperature nitrogen branch is additionally arranged on the cold stage gas path through a three-way valve. During a system temperature rising stage, the cold stage low-temperature gas path is closed and the normal-temperature nitrogen branch is opened, dry nitrogen is blown to the cold stage, the cold stage is rapidly heated under positive pressure protection, meanwhile, the cold hydrazine continuously obtains low-temperature nitrogen, and an ultralow temperature is maintained. The above-mentioned measures ensure that a large temperature difference (such as > 150 DEG C) always exists between the cold hydrazine and the cold stage, ensure that pollutants are preferentially captured by the cold hydrazine, effectively protect the surface of the sample to be clean, and fundamentally prevent the gas path from being blocked due to moisture backflow.

The invention belongs to the technical field of spacecraft ground test equipment, and particularly relates to a microgravity simulation device for spacecraft component ground test, which comprises a base, an air floatation support mechanism, an ultrasonic standing wave stabilization mechanism, a self-adaptive clamping mechanism, a servo drive error compensation mechanism, a control system and a test platform. The air floatation supporting mechanism provides vertical non-contact supporting force to offset gravity, the ultrasonic stabilizing mechanism maintains horizontal stability, the self-adaptive clamping mechanism is adaptive to parts of multiple sizes, and the servo compensation mechanism corrects deviation in real time. The composite suspension structure is combined with PID-fuzzy closed-loop control, the simulation error is controlled within 4.0%, the defects that existing equipment is low in precision, short in time, prone to pollution and poor in universality are overcome, long-time stable simulation can be achieved, and reliable support is provided for part ground verification.

The utility model relates to the technical field of mechanical transmission equipment, in particular to a two-stage planetary gearbox device for a fault diagnosis experiment. According to the technical scheme, the planetary gear train comprises a first-stage planetary gear train module, a second-stage planetary gear train module and a split type box body, the first-stage planetary gear train module is composed of an input shaft, a first-stage sun gear, three first-stage planetary gears evenly distributed by 120 degrees and a detachable planetary carrier, the input shaft is connected with the sun gear through a flat key, and a first-stage inner gear ring is fixed to a gasket through an inner gear ring pin; a secondary module is coupled with a primary planet carrier through a connecting shaft, a secondary sun gear of the secondary module is connected with an output shaft through a flat key, a secondary planet carrier also adopts a shaft body separation structure in threaded connection, a split type box body is fixed by an upper box body bolt and a lower box body bolt, a supporting block is arranged in the split type box body to stabilize an inner gear ring, and an input shaft end cover and an output shaft end cover are rapidly packaged through screws. According to the device, through the modular planet carrier design and the split type quick-release box body, quick replacement of gears is achieved, the device is suitable for multi-working-condition transmission performance comparison tests in a laboratory, and the experiment efficiency is remarkably improved.