32results about How to "Guaranteed airtight" patented technology

The utility model discloses a stern shaft hole sealing tool for moving a ship, which comprises a hole sealing cover plate and a cover plate pressing device, the hole sealing cover plate is rotatably connected with the side wall of a stern shaft through a connecting piece in a turnover manner, one end of the cover plate pressing device is fixedly connected with the side wall of the stern shaft, and the other end of the cover plate pressing device extends to the upper part of the upper end surface of the hole sealing cover plate. According to the tail shaft hole sealing tool for ship moving, through the hinge, the steel plate with the holes and the matched pressing device, the behaviors, such as welding and polishing of the front face of a steel casting, of damaging the steel casting are avoided, meanwhile, through the rubber gasket and the glass cement, sealing of a tail shaft hole is guaranteed, the phenomena of water leakage and the like possibly occurring during ship moving are avoided, and the service life of the tail shaft hole is prolonged. Work such as desilting and cabin washing after water enters the ship body is avoided, and subsequent manpower, material resources and time are saved.

The utility model discloses a wellhead optical cable blowout prevention valve, and relates to a wellhead. And the configuration technology field. The wellhead optical cable blowout prevention valve comprises a blowout prevention cabin base, a shell is welded to the blowout prevention cabin base, an underground optical cable penetrates through the blowout prevention cabin base and is welded, coiled, fixed and protected with a wellhead optical cable in the shell, optical cables are arranged in the blowout prevention cabin base, and the same optical cables are arranged in the shell; the sealing assembly is arranged on the shell, the sealing assembly comprises a fluorine rubber plug, a brass gasket, a plurality of fluorine rubber sealing rings I, a spring chuck, a locking nut, a plurality of fluorine rubber sealing rings II, a plurality of limiting rings and a fluorine rubber sealing ring III, and the shell, the optical cable and the blowout prevention cabin base are sealed by the sealing assembly in a multi-stage sealing mode; a plurality of sealing structures are adopted, airtightness is guaranteed, the whole body is made of 316L stainless steel, rusting is prevented, strength is improved, the pressure resistance can reach 70 MPa or above, and the optical fiber is plated with gold and welded to the sealing joint.

The invention discloses a TOP LED bracket substrate sealing welding method and a welding device, and relates to the technical field of LED bracket packaging. The sealing welding method comprises the following steps: first filling plastic between two metal plates; welding the plastic position by using a stir friction welding process; cutting off the middle part of the welding belt along the width direction of the welding belt to form a strip-shaped through groove; processing the metal plate into a lead frame, and filling the strip-shaped through groove with plastic to obtain a bracket substrate; the invention uses a stir friction welding process to weld the plastic filled between the metal plates, so as to ensure the sealing performance of the connection between the plastic and the metal plates, and refills the plastic, so that the connection between the plastic and the welding belt is actually the connection between the plastics, and no gap will be generated when the temperature changes due to different thermal expansion coefficients, thereby ensuring the airtightness of the TOP LED bracket after molding.

The utility model discloses a drying device for drying ceramic green bodies, which comprises a box body, a blanking platform and a controller, the box body comprises a drying chamber and a heating chamber, the drying chamber and the heating chamber are connected through a hot air pipe and an air return pipe, a track is arranged at the bottom of the drying chamber, and a material platform is arranged on the track. A hot air branch pipe and an air return branch pipe are arranged on the side wall of an inner cavity of the drying chamber, a humidifier is arranged on the upper portion of the inner cavity of the drying chamber, a moisture removal valve and a fresh air valve are arranged on the top of the drying chamber, an electric heating plate is arranged in the heating chamber, and a sliding rail is arranged on the discharging platform. By controlling the temperature and humidity in the drying chamber, the drying process is rapid and effective, the green body is not prone to cracking, high-quality drying of the green body is guaranteed, the drying time is shortened, and the purpose of efficient production is achieved.

The present invention addresses the problem of providing a coating container capable of ascertaining the remaining amount of a drawing material and hygienically ensuring airtightness. A coating container according to one embodiment is provided with: a front tube; an outer cylindrical member; an inner cylindrical member fixed to the outer cylindrical member; and a push rod for pressing the drawing material by advancing inside the inner cylindrical member, thereby causing the drawing material to appear from the opening of the front cylinder. The outer cylindrical member has a through hole formed in a side surface of the outer cylindrical member. At least a portion of the inner cylindrical member exposed from the through hole is provided as a transparent portion, and the inside of the inner cylindrical member is visible through the transparent portion. The push rod is provided with a visual recognition part which can be visually recognized from the outer side of the inner cylindrical part through the transparent part. The remaining amount of the drawing material can be grasped by visually recognizing the state of the visual recognition part which can be visually recognized through the transparent part.

The application provides a method for obtaining SVF by mechanically treating fat, and a connecting device for obtaining SVF by mechanically treating fat, which comprises a shell, an interface pipe, a wheel disc, and a roller; the wheel disc is rotatably connected to the inside of the shell through a shaft, the roller protrudes from the shell and is engaged with the wheel disc; a limiting structure is in rolling engagement with a limiting block. In use, two injection devices are connected to the interface pipe of the connecting device at the same time, the wheel disc is rotated to select a corresponding processing hole to be communicated with the interface pipe, and the injection device is pushed to make fat pass through the connecting device for obtaining SVF by mechanically treating fat and enter the other injection device. The connecting device has a convertible hole diameter, can adjust the hole diameter shape and quantity between the injection devices, and achieves the purpose of cutting and emulsifying fat in different degrees.

The utility model belongs to the field of unloading machine, belongs to vertical spiral unloading machine, the utility model discloses a rack, vertical material conveying mechanism and horizontal material conveying mechanism, vertical material conveying mechanism is installed on the rack vertically, horizontal material conveying mechanism is installed on the rack horizontally, vertical material conveying mechanism top with horizontal material conveying mechanism intercommunication, and material is transported from vertical material conveying mechanism to horizontal material conveying mechanism, and then is unloaded by horizontal material conveying mechanism again, vertical material conveying mechanism includes vertical spiral machine, feeder and scraper, vertical spiral machine bottom feed inlet is installed with feeder, and the both sides of feeder are provided with scraper, and vertical spiral machine top outlet communicates with the feed inlet of horizontal material conveying mechanism. Solve the problem of keeping high productivity, and have flexibility and reliability simultaneously, be applicable to the bulk material unloading operation problem of a variety of complex working conditions, abandon the redundancy material collector and double spiral configuration, through the synergistic effect of single vertical spiral mechanism and adjustable scraper, simplify the equipment structure, reduce the manufacturing cost and maintenance difficulty.

The cylinder device comprises a cylinder body and a cylinder cover, the cylinder body and the cylinder cover are detachably connected, a plurality of first holes are formed in the cylinder body, a plurality of floating pieces are distributed on the peripheral wall of the cylinder body in a central symmetry mode, and the floating pieces are connected with the cylinder cover. The floating piece is of an oval cavity structure and is arranged in the vertical direction of the barrel. The device disclosed by the utility model is simple and easy to use, convenient to operate, economical and practical, and the hollow structural design of the cylinder body is beneficial to keeping survival of the Octopus ocellatus parents. The water volume of the transportation water tank can be fully utilized, and the transportation cost is reduced; it is guaranteed that the octopus ocellatus parents have independent spaces in water, and the octopus ocellatus parents are prevented from being extruded and damaged in the transportation process; the method can be used for living body transportation of octopus ocellatus parents on

This utility model relates to the field of disinfection technology for pure water purification equipment, and discloses a heat-sterilized reverse osmosis pure water machine, including a base plate. Two filter tanks are fixedly connected to the top right side of the base plate. Inlet pipes are slidably connected to the top of each of the two filter tanks. Quick-release mechanisms are provided at the bottom of each of the two inlet pipes. Protective mechanisms are provided on the front and rear sides of the top of the base plate. Sealing mechanisms are provided on the outer walls of each of the two inlet pipes, used to seal the top of the filter tanks. The quick-release mechanism includes two mounting rings. In this utility model, when installing the reverse osmosis membrane, the moving block is inserted into the slot along the sliding groove under the spring force. The limiting block slides within the limiting groove to ensure stability. When the reverse osmosis membrane becomes clogged after long-term use and needs replacement, pressing the moving block compresses the spring to disengage it from the slot, allowing the mounting bracket to be removed. This achieves convenient and quick replacement of the reverse osmosis membrane, reducing maintenance difficulty and replacement time.

The invention discloses comprehensive environment aging test equipment, relates to the technical field of aging test devices, and aims to solve the problem that existing comprehensive environment aging test equipment is not tight in sealing. Comprising an outer box and an inner box, the inner box is arranged in the outer box, fixing assemblies are symmetrically installed on the inner walls of the two sides of the inner box, each fixing assembly comprises two parallel fixing strips, and a sample frame is installed between the two fixing strips on the inner walls of the two sides of the inner box. The sealing rings are mounted between the left door plate and the outer frame as well as between the right door plate and the outer frame, the sealing rings are made of specially-made silicone rubber sealing strips resistant to high and low temperatures so as to ensure the sealing of the test area, and the irradiation compensation unit is used for performing irradiation intensity compensation analysis on the metal halogen lamp to obtain execution power. And then the metal halogen lamp is controlled to operate at the execution power, so that the irradiation intensity of the lamp tube can be well compensated, and the influence on the accuracy of a test result due to the reduction of the irradiance caused by attenuation of the metal halogen lamp is avoided.

A kind of desktop fume exhaustor with oil collection guide structure, the front end of fume exhaustor shell is inclined and arranged downward;The front end of fume exhaustor shell is provided with inwardly retracting retracting ring wall;Retracting ring wall is provided with annular mounting groove for mounting filter screen assembly;Retracting ring wall and the front end of fume exhaustor shell form oil collection groove;Lower oil outlet is opened near the bottom end of oil collection groove;The top of base body is provided with inclined oil guide cavity, which is below the lower oil outlet;Inclined oil guide cavity is communicated with one side of the upper end of oil guide column;Inclined oil guide cavity and oil guide column are integrally formed structure.The utility model, oil collection groove and inclined oil guide cavity are both large-space buffer oil guide space, and oil stain is not easy to produce blockage.By designing inclined oil guide cavity and oil guide column as integrally formed structure, the gap of traditional multi-section oil guide pipe column joint is completely eliminated, the whole oil circuit is ensured to be airtight, and the cleanliness and reliability of product are significantly improved.

The invention discloses a medicine bottle structure capable of discharging medicine quantitatively, which comprises a bottle body used for storing medicine powder; the upper cover is in threaded connection with the bottle body; the flexible expansion body is arranged in the bottle body; wherein the flexible expansion body is filled with gas, the two sides of the flexible expansion body are provided with protruding parts which are symmetrically arranged, the protruding parts penetrate through the side wall of the bottle body, the outer side surfaces of the protruding parts are fixedly installed on the bottle body, and the top of the upper cover is provided with a discharging nozzle. Compared with the prior art, the problem that the single-time obtaining amount of the powdery medicine in the medicine bottle cannot be controlled is solved.

The invention provides a semi-halberd closed connecting structure, and relates to the technical field of indoor construction structures. The semi-halberd closed connecting structure comprises a wallboard and two connecting base plates. The wallboard comprises a wall panel and two frame plates, the two frame plates are connected to the upper end and the lower end of the wall panel respectively, the wall panel is filled with a core plate, the two connecting base plates are fixed to a floor and a ceiling respectively, clamping grooves are formed in the two connecting bases, and the two frame plates are clamped into the two mounting clamping grooves respectively. The semi-halberd closed connecting structure has the beneficial effects that the semi-halberd type supporting halberd plate is adopted to support the side plate on the connecting seat, so that the structural strength of the connecting seat can be improved; a mounting clamping groove is formed between the two side plates on the connecting seat, so that the end part of the wall plate is tightly clamped in the mounting clamping groove, and the sealing of the clean room is ensured; the connecting base is fixed through the expansion screw, the end of the expansion screw is located in the receding groove of the frame plate, and the problem that a traditional anchor connecting structure is not airtight is solved.

The present invention relates to an extraction and filtration device for extracting a target substance from a solid sample, wherein the main body is an extraction bottle. After the extraction is performed using the extraction bottle, the extraction bottle is converted into an extraction liquid filtration kit to facilitate filtering the extraction liquid. The extraction bottle comprises a bottle body (4) with an open top and a bottom, a first sealing screw cover (1), a second sealing screw cover (8) and a fastening clamp (9), wherein a screw cover fastening groove (14) is arranged on the outer surface of the second sealing screw cover (8); a bottle mouth fastening groove (5) is arranged on the outer surface of the lower end of the bottle body (4) near the position of the lower screw mouth (6) of the extraction bottle; the fastening clamp (9) is in a double arc shape, including a bottle mouth arc circle (91) and a screw cover arc circle (92). The present invention can conveniently realize multiple extractions by extraction methods such as ultrasonic extraction method and oscillation extraction method, thereby improving the accuracy of sample analysis.

The utility model relates to the technical field of liquid sampling, in particular to an atomized liquid PH value detection device which comprises a support, an extraction disc installed on a machine frame and used for extracting atomized liquid in a sealed mode, a hose convenient to replace and a detector for PH detection. The extraction disc comprises a sampling pipe for extracting stock solution through air pressure, a ball valve for controlling opening and closing of the extraction disc and an anti-corrosion needle tube, a tank to be detected is placed on the support, the extraction disc is installed on the support, the detector is placed beside the support, a sample tank is placed on the detector, one end of the hose is connected to the extraction disc, and the other end of the hose is connected to the top of the sample tank. The ball valve is mounted at the bottom of the sampling pipe and positioned on the lower surface of the sampling disc. Through the air pressure change of the sampling pipe, atomized liquid is rapidly extracted and transferred, reinspection and repeated sampling are facilitated, the hose is conveniently and rapidly replaced, the atomized liquid is prevented from leaking, meanwhile, good sealing performance is achieved, and the sampling pipe and the ball valve are spliced and installed, independent disassembly and cleaning are facilitated, and long-term use is facilitated.

The utility model provides an air door adjusting control device which comprises an air duct and further comprises an air door assembly which comprises a frame-shaped groove formed in the inner wall of the air duct, an air door body arranged in the frame-shaped groove in a sliding mode and a push rod fixedly connected with the air door body. The linkage assembly comprises a supporting column and a rotating plate connected with the push rod; and the pushing assembly is used for driving the linkage assembly to rotate. Through cooperation of the air door assembly, the linkage assembly and the pushing assembly, the linkage assembly can rotate through work of the pushing assembly, the linkage assembly can drive and pull the air door assembly to move when rotating, the mode that a traditional air door shaft drives an air door to rotate is replaced, and it can be ensured that the air door body seals a hot air channel and a cold air channel; and the refrigerating or heating effect of the air conditioner is ensured.

The invention relates to a full-diameter long rock core oil washing method which comprises the following steps: placing a rock core in a constant-temperature box to enable soluble substances in the rock core to be in a flowing state, then placing the full-diameter long rock core in a full-diameter rock core holder again, establishing an oil washing process, and removing impurities and crude oil contained in the rock core by adopting an oil washing agent reciprocating displacement mode. And multiple rounds of oil washing are carried out through the oil washing agent, one round of oil displacement is set as six cycles, and the oil washing agent in the intermediate container is sampled after each round of oil washing is finished until the oil washing qualification standard is reached. The oil washing method is simple and convenient, the oil washing efficiency can be greatly improved, oil washing is convenient, good sealing performance is achieved, the used oil washing agent is low in price and easy to obtain, and the oil washing cost is reduced.

The utility model relates to the field of range hoods, and discloses a top-side double-suction range hood which comprises a shell, electric push rods are fixedly connected to the two sides of the interior of the shell, couplings are fixedly connected to the output ends of the electric push rods, driving rods are rotationally connected to the interiors of the couplings, and a connecting rod is rotationally connected to one side of each driving rod; a plurality of rotating rods are rotatably connected to one side of the outer wall of the connecting rod, a plurality of rotating shafts are rotatably connected to the two sides of the interior of the shell, one side of the outer wall of each rotating shaft is rotatably connected to one side of the interior of the corresponding rotating rod, and a flow guide plate is fixedly connected to the center of the outer wall of each rotating shaft. According to the double-suction range hood, the rotating rod drives the rotating shaft to further drive the flow guide plate to rotate, so that the orientation of the flow guide plate is controlled, smoke is conveniently sucked, the problem that the efficiency of a smoke suction hole in the other side is low when a cooking range on one side is used due to the fact that the smoke suction hole of the double-suction range hood is fixed is solved, and the usability and the smoke suction efficiency of the range hood are improved.

The utility model provides an electrical linkage ventilation system for a high-voltage large-capacity frequency converter, which comprises an axial flow fan, a shutter arranged on the front side of the axial flow fan and an automatic plugboard arranged on the rear side of the axial flow fan, the automatic plugboard is connected with the axial flow fan through a connecting frame, and the connecting frame comprises a plugboard moving part and a plugboard driving part. An inserting plate driving motor is arranged on the inserting plate driving part, and the automatic inserting plate is driven by the inserting plate driving motor to move left and right on the inserting plate moving part; the automatic plugboard is provided with a plugboard opening limit switch and a plugboard closing limit switch which are respectively and electrically connected with the main power supply and a fan motor of the axial flow fan, after the automatic plugboard moves rightwards in place, the plugboard opening limit switch is closed, the fan motor is electrified, the axial flow fan runs, and after the automatic plugboard moves leftwards in place, the plugboard closing limit switch is closed. And when the fan motor is powered off, the axial flow fan stops running. The device is good in leakproofness, and when the device stops running, dust, rain and snow cannot enter the device room to pollute the device.

The utility model belongs to the technical field of food processing tools, and particularly relates to a cream gun bottle cap which comprises a bottle cap body, one end of the bottle cap body is an open end and is a threaded hole, and the other end of the bottle cap body is a closed end. The cream outlet is formed in one side of the closed end of the bottle cap body and is communicated with the inner side of the bottle cap body; the air inlet hole is formed in the other side of the closed end of the bottle cap body and communicated with the inner side of the bottle cap body; the outer valve sleeve is arranged at the closed end of the bottle cap body, and the air inlet penetrates out of the middle of the outer valve sleeve; wherein the outer valve sleeve and the bottle cap body are integrally formed.

The utility model relates to a microbial fertilizer fermentation device. The microbial fertilizer fermentation device comprises a box body, a stirring assembly and a discharging assembly, a fermentation chamber used for containing fermented materials is arranged in the box body. The stirring assembly comprises a first power source and a telescopic stirring rod, and the first power source drives the telescopic stirring rod to rotate in the fermentation chamber to achieve material mixing. The discharging assembly is composed of a cutting plate and a discharging push plate, and a discharging opening communicated with the fermentation chamber is formed in the side wall of the bottom of the box body. The discharging push plate can move in the direction close to or away from the discharging opening and is used for pushing out bacterial manure; the cutting plate is movably arranged above the discharging push plate and moves in the horizontal direction, the lower surface of the cutting plate abuts against the upper surface of the discharging push plate, and the functions of cutting and pushing the bacterial fertilizer are achieved. The device ensures uniform mixing of fermented materials through the stirring assembly, realizes efficient discharging through cooperation of the discharging assembly, and has the characteristics of reasonable structure and simplicity and convenience in operation.

The present invention relates to an air microorganism sampling device, comprising a sampling can, a hollow frame, a supporting frame and a collection box; a hollow frame is embedded in the upper opening of the sampling can, a sampling bucket is docked in the hollow frame, a supporting frame is arranged on the peripheral wall of the end of the hollow frame embedded in the sampling can, and a drainage module is arranged at the output portion of the supporting frame. The air microorganism sampling device can supply the liquid beads in the supply box 1 to the output frame through a supply passage 1 through a hollow plate, a linkage rod and a sealing gasket, and when the output frame approaches the grille, the output nozzle directly acts on the liquid beads in the grille, and the liquid beads wrap the aerosol-like substances and impurities, so that under the action of gravity and roundness, these aerosol-like substances and impurities can better enter the collection seat, so that the removal effect of the aerosol-like substances and impurities is greatly improved, and the efficiency of introducing air microorganism samples is improved, ensuring that the overall device can keep working without stopping during the sampling process.

The utility model provides an assembly type roof system which comprises a roof frame and a unit plate connected to the roof frame, the end portion of an aluminum plate of the unit plate is provided with a connecting portion extending into the roof frame, and the connecting portion is connected with the roof frame in a sealed mode. First frames connected through end sealing plates are arranged at the ridge and the roof of the roof frame, supporting structures fixed to the main body steel structure are arranged on the first frames, connecting intervals are formed between the adjacent first frames, and the end sealing plates are provided with inner pressing plates and outer pressing plates on the indoor sides and the outdoor sides of the first frames correspondingly. The inner pressing plate and the outer pressing plate jointly cover the first frames on the adjacent sides, and the inner pressing plate is provided with an adjusting bolt which penetrates through the connecting interval to be connected with the outer pressing plate. All curtain wall plates are unitized and can be directly assembled on site, the construction period problem is solved, and the design time and the machining and manufacturing time are saved.

The application provides a docking mechanism small cavity leak rate test tool and test method related to the field of leak rate test, which comprises an upper head assembly and a leak detection pipeline assembly, the leak detection pipeline assembly is connected to the upper head assembly, the upper head assembly is sealed and locked with a docking mechanism product to be tested to form a small cavity space, the leak detection pipeline assembly inflates the small cavity space of the docking mechanism product to be tested, and the internal pressure of the small cavity is tested in real time. Through the design of the upper head assembly, the setting of the pre-tightening force of the docking lock mold simulation part hook, the functional performance of the passive part of the docking mechanism is fully simulated, the cooperation of the active and passive parts of the docking mechanism during the small cavity leak rate test is avoided, the complexity of the test tool system is effectively simplified, the operation process is simplified, and the operation difficulty is reduced. Through the series connection of the gas pressure sensor in the leak detection pipeline, the product pipeline pressure is monitored in real time, the difficulty of the leak rate test is reduced in the mechanical and electrical combination mode, and the reliability of the leak rate test is ensured by the reverse installation of the stop valve to ensure the air tightness after being closed.

The utility model discloses a special numerical control lathe machining center for graphite, which comprises a lathe body, a protective cover and a telescopic mechanism, a collecting cavity is arranged on the lathe body, an opening and closing door is arranged on the lathe body corresponding to the collecting cavity, a knife rest is arranged on the lathe body, and a three-jaw chuck is further arranged on the lathe body. A protective cover corresponding to the three-jaw chuck is arranged on the lathe body, a telescopic mechanism corresponding to the tool rest is arranged on the protective cover, a through opening is formed in the right end of the protective cover, a protective door is arranged in the through opening, a lifting mechanism corresponding to the protective door is arranged on the protective cover, inclined blocks are symmetrically arranged in the protective cover front and back, and a dust removal mechanism is arranged at the upper end of the protective cover. When the graphite dust collection device is used, the fan is started to suck external air into the protective cover, and the graphite dust in the protective cover can be conveniently blown into the collection cavity by the sucked air through matching with the inclined block structure, so that the graphite dust can be conveniently cleaned in the later period.

The utility model discloses a through-wall assembly of an energy storage cabinet, and belongs to the technical field of energy storage cabinets. In order to solve the problems that in the prior art, a through-wall rubber part is poor in sealing performance and prone to falling off, according to the through-wall assembly of the energy storage cabinet, the cable can be kept airtight when being arranged in the cable through the cable by arranging the cable on the metal plate, and when the metal plate is installed in a square hole of a wall body, the cable is not prone to falling off. The turnover plate is directly turned down to be parallel and attached to the metal plate, at the moment, the turnover plate makes contact with the wall body and is attached to the wall body, the structure that the turnover plate and the metal plate jointly clamp the wall body is formed, and it is guaranteed that the through-wall assembly can be firmly installed on the wall body. The screw holes are further arranged, the metal plate is further ensured to be firmer during installation, the cable gland and the metal plate are connected through the threads, the cable gland and the metal plate can be tightly installed and can be detached at the same time, and the using flexibility of the cable gland is enhanced.

The utility model relates to a spaceflight core circuit board batch screening test fixture, which relates to the technical field of spaceflight electronic equipment testing, and comprises an upper shell and a lower shell, and the upper shell covers the lower shell; eight sunken open grooves are formed in the bottom face of the interior of the upper shell and the bottom face of the interior of the lower shell, supporting and limiting protrusions are arranged at the positions, close to edge openings of the bottom faces, of the sunken open grooves, and three positioning holes are formed in the edge opening of each sunken open groove; one end of the inner bottom surface of the upper shell and one end of the inner bottom surface of the lower shell are each provided with a through vacuum pumping hole and a pin header wiring hole. DB25 connecting holes communicated with the pin header wiring holes are formed in the side faces of the upper shell and the lower shell, screw holes are formed in the two sides of each DB25 connecting hole, and dispensing holes are formed in the outer side edge openings of the pin header wiring holes. The test fixture has the advantages that the test efficiency is greatly improved, and the test fixture has great generalization performance.