167results about How to "Adjust volume" patented technology

The invention relates to a test device and a method for various types of oil pumps, and particularly discloses a sealing type test device and a method applicable to various types of oil pumps. The test method concretely comprises the following steps of: (1) setting the step length of the initial value of the inlet pressure value Gs of the oil pumps to be tested and the gradual decrease Gs value according to the oil pump work points; (2) setting the upper and lower limit values of each step Gs through a visual interface of the monitoring software in a host computer; (3) setting the upper and lower limit values of the test media temperature T through the visual interface of the monitoring software in the host computer; (4) obtaining a net positive suction head calculation formula through deduction and simplification; and (5) gradually decreasing the Gs value according to the step length and finely regulating a throttle valve to enable the oil pump full pressure to be stabilized to the test point pressure value. The test device and the method have the advantages that the sealed space pressure regulation range is large, the pressure of the sealed space can be fast, stably and highly reliably regulated, in addition, the environment is protected, and the tested data are accurate.

The invention discloses a variable-compression-ratio mechanism for engines, a variable-compression-ratio engine and an automobile. The variable-compression-ratio mechanism comprises a through hole, pistons, rotating rings, limit parts, and a worm, wherein the through hole is positioned in a cover body; the pistons are positioned in the through hole and can move in the through hole in the axial direction, each piston comprises a thread part and a sealing part in the axial direction, opposite circumferential surfaces of the sealing parts and opposite circumferential surfaces of the through hole are in torque resisting matching, and external threads are formed in the external surface of each thread part; the rotating rings are mounted at the outer parts of the thread parts in a sleeving manner, internal threads are formed in the internal circumferential surfaces of the rotating rings and are in screwed matching with the external threads, and a plurality of bar-shaped teeth which are distributed at intervals in the circumferential direction are arranged at the external circumferential surfaces of the rotating rings; the limit parts are respectively positioned on two sides of the axial direction of the rotating rings and connected with the inner wall of the through hole; the worm is perpendicular to the pistons and is positioned in the cover body, at least one end of the worm is positioned outside the cover body, and helical teeth of the worm are meshed with the bar-shaped teeth of the rotating rings. The variable-compression-ratio engine with an air cylinder cover of the scheme is simple in structure and convenient to operate, and the knockings generated when the engine is highly loaded can be can be avoided by regulation of compression ratio.

The invention provides a drum type washing machine with a retractable drum and a drum retracting method. The washing machine comprises an outer drum assembly including a first outer drum and a second outer drum which is sleeved with the first outer drum and capable of retracting. The washing machine further comprises a door body and an inner drum assembly. The door body is arranged at the front end of the second outer drum. The inner drum assembly is provided with a first inner drum and a second inner drum which is sleeved with the first inner drum and capable of retracting. A structure ensuring synchronous retraction is arranged between the second outer drum and the second inner drum. By arranging the retractable second outer drum and the second inner drum, the volume of the inner drum of the washing machine is adjusted. By arranging the door body at the front end of the second outer drum, clothes are conveniently placed and the door body and the second outer drum can be conveniently sealed. In addition, operation is not required to be performed on the second outer drum and the second inner drum respectively due to the structure for synchronous retraction between the second outer drum and the second inner drum. Therefore, operation efficiency is improved.

The invention discloses a lubricating oil filling device for a bearing. The lubricating oil filling device comprises an oil injection cavity, wherein an oil outlet is formed in the middle of the rightside of the oil injection cavity, and the middle of the left side of the oil injection cavity is slidably connected with a telescopic rod; an air cylinder is slidably connected to the tail end of theleft side of the telescopic rod, a sealing ring is connected to the joint of the left side of the oil injection cavity and the telescopic rod through viscosity, the tail end of the right side of thetelescopic rod is fixedly connected with a baffle through welding, rubber plugs are fixedly connected to the joints of the baffle and the oil injection cavity through viscosity, and a spring is fixedly connected to the telescopic rod; an oil storage tank is fixedly arranged below the oil injection cavity, and the oil storage tank is formed by a cavity defined by fixing plates and a telescopic cup;and the lower surface of the oil injection cavity is fixedly connected with the fixing plates through welding, and a sliding rail is fixedly connected to a groove formed in each fixing plate throughviscosity. The lubricating oil filling device is scientific and reasonable in design, feasible in scheme and high in market popularization value.

The invention belongs to the technical field of artificial cornea production and more particularly provides an active regenerating artificial cornea implant and a preparation method thereof. The artificial cornea implant comprises 5-30 shares of chitosan, 5-30 shares of collagen, 0.1-0.5 share of chondroitin-sulfuric acid, 5-10 shares of polyethylene glycol, 5-25 shares of polyvinyl alcohol and 15-80 shares of triple-distilled water; preferably the artificial cornea implant also comprises appropriate amount of cornea cell growing factor, fibronectin and laminin. The preparation method of the active regenerating artificial cornea implant is as below: dissolving the chitosan, the collagen and the chondroitin-sulfuric acid in hydrochloric acid, acetic acid and water respectively, and then infusing the mixture of the components which are agitated uniformly at the room temperature into a mould for drying, and then obtaining the product after water immersion, cleaning and drying. The artificial cornea implant has good biocompatibility, high substance rigidity and good transparency; the preparation method is easy to be operated, the raw materials are easy to be obtained and are cheap, and large-scale industrialized production can be performed.

The invention provides a marine fuel cell hydrogen storage and supply system. The hydrogen storage and supply system comprises a protective cover, a hydrogen storage system, a hydrogen filling system and a hydrogen supply system. A plurality of ventilation openings are formed in the protective cover; the hydrogen storage system comprises a hydrogen storage and supply system base, a hydrogen cylinder bracket, a hydrogen cylinder fixing device, an excessive hydrogen concentrated discharge port and a plurality of hydrogen cylinders; the hydrogen filling system is used for filling hydrogen into the hydrogen storage system, a hydrogen filling port is formed in the hydrogen filling system, and the hydrogen filling port is connected with a hydrogen filling pipeline; and the hydrogen supply system is connected with the hydrogen storage system and a fuel cell, conveys the hydrogen stored in the hydrogen storage system into the fuel cell, and comprises a hydrogen supply pipeline connected with the hydrogen filling pipeline, and the hydrogen supply pipeline is connected with the fuel cell. The system is compact in overall structure, light in weight, small in size, more stable in structural design and capable of adapting to driving of ships in complex and changeable marine environments, and meanwhile a space is saved.

The invention relates to an integrated reactor and a method for removing ammonia nitrogen and organic matter from drinking water. The integrated reactor comprises a biological oxidation area and an ultrafiltration membrane filtering area; a tube type static mixer is arranged before the biological oxidation area and the ultrafiltration membrane filtering area which are positioned in the same reaction tank; and the biological oxidation area is positioned between the tube type static mixer and the ultrafiltration membrane filtering area. Organic matter with medium molecular weight or volatile organic matter is adsorbed by activated carbon; ammonia nitrogen and organic matter with small molecular weight is removed by microorganisms on the surface of biofilm packing and powdered activated carbon; and bacteria, microbial films and the like are removed by filtering and an ultrafiltration membrane to ensure safety of the microorganisms. Particulate matter with high density in water, microbialfilms falling off, powdered activated carbon and the like enter a sludge chamber under the gravity action, and are discharged by a sludge discharge pipe. The integrated reactor can be used for drinking water treatment of a polluted water source, and can also be applied to treatment of municipal sewage and recycled water.

The invention discloses an ingredient mixing device for mixed flour processing and a use method thereof, and relates to the technical field of flour processing. The device comprises batching barrels, a circular turntable, a mixing barrel and a driving mechanism, wherein the multiple batching barrels which are uniformly distributed along the circumference are arranged at the edge of the circular turntable, a rotating shaft at the bottom of the circular turntable is fixedly connected with an output shaft of a first motor, the first motor is fixed on a supporting table, and the mixing barrel is arranged below the batching barrels; the mixing barrel is fixedly mounted on the driving mechanism; and the driving mechanism is mounted on the supporting table. Through cooperation of an upper electromagnetic valve, a metering cylinder and a lower electromagnetic valve, quantitative adding of ingredients can be achieved, through arrangement of an adjusting sleeve, a mounting plate and a bolt, the volume of the metering cylinder can be freely adjusted, the whole device achieves automatic ingredient mixing, the production efficiency is high, and the problems that an existing ingredient mixing device is low in machining efficiency, automatic production is difficult to realize, and quantitative feeding is difficult to realize are solved.

The invention relates to the intelligent medical field based on Internet of Things, in particular to an intelligent medicine box system. The system comprises an intelligent medicine box, a mobile terminal, a computer web end and a cloud server, wherein the intelligent medicine box is wirelessly connected with the mobile terminal to add medicine taking plans, and the mobile terminal and the computer web end are both connected with the cloud server to achieve data communication. The system has the advantages that medicine taking plans and remind voice can be set on the intelligent medicine box through the portable mobile terminal, medicine taking plans and medicine information can be checked through the mobile terminal, the computer web end and the intelligent medicine box, multiple functions are realized, and the intelligent medicine box is reasonable in design and structure, small in size and convenient to carry and has multiple functions.

The invention discloses a height limit detection method and device based on machine vision recognition, and the method comprises the following steps: adjusting the focal length of a camera of a photographing mechanism, and calibrating an image coordinate system of the camera; acquiring a vehicle image; acquiring height information of the target vehicle according to the longitudinal scale corresponding to the depth scale line of the target vehicle in the vehicle image; acquiring an image of a height limiting rod in front of the target vehicle; obtaining height information of a target height limiting rod according to a longitudinal scale corresponding to a scene depth scale line of the height limiting rod image where the target height limiting rod is located in the height limiting rod image;comparing the height information of the target height limiting rod with the height information of the target vehicle; obtaining a height difference. According to the detection method, vehicle overallheight detection and height limiting rod height detection can be realized, analysis is performed by comparing the heights of the detection vehicle and the height limiting rod, and whether the heightis ultrahigh is judged according to the analysis result.

The invention relates to a luggage case, in particular to a telescopic luggage case with a drying function. The telescopic luggage case comprises a case cover, a case bottom, separating plates and telescopic links, wherein multiple separating plates are arranged, the case cover, the separating plates and the case bottom are sequentially arranged from top to bottom, and the case cover and the separating plate which are adjacent, the adjacent separating plates as well as the separating plate and the case bottom which are adjacent are connected by virtue of the telescopic links respectively; a first flange is arranged at the edge of the lower surface of the case cover, and a first wrapping fabric is arranged between the first flange and the adjacent separating plate; a second flange is arranged at the edge of the upper surface of the case bottom, and a second wrapping fabric is arranged between the second flange and the adjacent separating plate; and a third wrapping fabric is arranged between the adjacent separating plates. The luggage case provided by the invention has the advantages that articles can be classified and placed, the luggage case can be conveniently used by people, and the luggage case also has a volume-adjustable driving function, so that the people can carry fragile objects conveniently.

The invention discloses adjustable fertilizer spreading equipment for agricultural planting, comprising a frame and a fertilizer spreading unit; a support plate is mounted on the frame; a mounting plate is mounted on the supporting plate, and the fertilizer spreading unit is mounted on the mounting plate; a height adjusting mechanism and an angle adjusting mechanism are respectively arranged between the mounting plate and the supporting plate and between the supporting plate and the frame; the fertilizer spreading unit comprises a mounting frame, a double-shaft motor, a worm, a worm wheel, a connecting rod, a cylindrical shell, a fertilizer hopper and a fertilizer transfer roller; an air bag is mounted in a fertilizer transfer groove, and an air supply pipe is connected to the center of afertilizer transfer drum; the air supply pipe extends into a fertilizer rotating cylinder and is connected with the air bag through a gas distribution pipe and a gas pipe joint. The fertilizer spreading unit, the height adjusting mechanism and the angle adjusting mechanism are provided; automatic swinging type fertilizer spreading is provided, so that the fertilizer spreading range is enlarged, and fertilizer spreading efficiency is improved; the air bag and an air pump are provided, air is charged into or removed from the airbag through the air pump, the volume of the fertilizer transfer groove can be adjusted, and the effect of adjusting the fertilizer spreading amount is achieved.

The invention discloses an inner container of a water tank and a water heater. The inner container of the water tank comprises a separating plate which can divide the inner container of the water tank into a water storing chamber and an adjusting chamber, wherein the separating plate is provided with a first position and a second position; the separating plate at the first position can move or be deformed to increase the capacity of the water storing chamber when one side of the water storing chamber is stressed; the separating plate at the second position can be returned through the air pressure in the adjusting chamber. According to the inner container of the water tank and the water heater, the separating plate is arranged in the inner container of the water tank and divides the inner container of the water tank into the water storing chamber and the adjusting chamber; the separating plate position can be controlled through the air pressure in the adjusting chamber, so as to achieve the purpose of adjusting the capacity of the water storing chamber; in addition, the capacity of the water storing chamber can be increased while the pressure in the water storing chamber increases, thus the pressure in the water storing chamber can be reduced, and as a result, the inner container of the water tank can be prevented from being expanded and broken; meanwhile, the reliability and applicable scope of the water tank and the water heater can be improved.

The invention discloses a hydraulic end assembly and a plunger pump with the same. The hydraulic end assembly comprises a fluid suction valve and a fluid draining valve, wherein the fluid suction valve is internally provided with a fluid suction valve cavity, and a fluid suction valve element assembly is arranged in the fluid suction valve cavity; and the fluid draining valve is internally provided with a fluid draining valve cavity, and a fluid draining valve element assembly is arranged in the fluid draining valve cavity. The fluid suction valve and the fluid draining valve are arranged in parallel and are detachably connected, and the fluid suction valve cavity and the fluid draining valve cavity communicate with each other through a plunger cavity. The fluid suction valve element assembly is used for controlling the fluid suction valve cavity and the plunger cavity to be connected and disconnected for sucking fluid. The fluid draining valve element assembly is used for controllingthe fluid draining valve cavity and the plunger cavity to be connected and disconnected for draining fluid. According to the hydraulic end assembly and the plunger pump with the same, the problem thatan existing hydraulic end assembly is inconvenient to dismount, mount, maintain and repair is solved; and meanwhile, the excess flow is increased, volume efficiency is improved, the performance of the hydraulic end assembly and the plunger pump is also improved, and the using requirements under the complicated work conditions are met.

The invention relates to a portable fault-detection maintenance support toolbox with a sorting function. The portable fault-detection maintenance support toolbox comprises a box body and grooves, a box door is arranged on the outer side of the left end of the box body, and a frame body is connected to the outer side of the box body. A side chamber is formed in the left end of the box body, and theinner end of the side chamber is connected with horizontal partition plates. An outer handle is fixed to the outer side of the right end of the box body. Air holes are formed in the inner sides of the grooves, and the grooves are located around the frame body. Storage compartments are connected to the bottom ends of the air holes, and openings are formed in the tops of the right ends of the storage compartments. The portable fault-detection maintenance support toolbox has the beneficial effects that the portable fault-detection maintenance support toolbox with the sorting function is providedwith the openings through which drying materials such as a desiccant can be added to the storage compartments, and the interior of the box body is dried through the air holes; and through the clamping between clamping columns and clamping grooves, sealing covers can be firmly fixed to the outer sides of the openings to seal and fix the openings.

The invention provides a method and device for processing cakes. The method comprises the following steps: preparation of egg white raw materials of liquid cakes, storage of egg white raw materials of liquid cakes, preparation of yolk raw materials of liquid cakes, aeration of egg white raw materials of liquid cakes, mixture of yolk raw materials of liquid cakes and aerated egg white raw materials of liquid cakes and formation baking of mixture of liquid cakes. Compared with the prior art, the method has the advantages of continuous production, convenient control of the swelling degree and the swelling uniformity of cakes, easy regulation of the air capacity of cakes as required, insusceptibility to manpower and human factors and the like.

The invention provides a soft package lithium battery pack and an assembly method thereof. The soft package lithium battery pack comprises an iron box, wherein a plurality of lithium battery modules are detachably connected in the iron box, power line guide holes are formed in the lithium battery modules, the plurality of lithium battery modules are connected in series / parallel via the power lineguide holes, the iron box is also provided with a battery management system (BMS) assembly and a communication interface, the communication interface is electrically connected with the BMS assembly and is electrically connected to a power selection module, and the power selection module is arranged in the iron box and is used for selecting and switching an output voltage of the soft package lithium battery pack. The soft package lithium battery pack has the advantages of stable structure, stable performance and long service lifetime and is simple to assemble.

The invention discloses a microoperation device and method based on the capillary force and belongs to the technical field of microoperation. A liquid drop generation mechanism, a moving operation mechanism and a top view mechanism are all arranged on a vibration reduction table. The influence of external vibration on operation of the micro device can be reduced by operating on the vibration reduction table, so efficient and high-precision picking, transferring and releasing of the micro device are completed under the action of capillary force. A micro propelling pump, an industrial camera anda three-dimensional electric displacement platform can be integrally controlled through a computer, and automatic control over the operation process of the micro device can be achieved, the micro-operation device based on the capillary force is simple in structure, capable of achieving automatic control, convenient to operate and easy to achieve industrial production.

The invention relates to a variable volume phase balance measurement device for multicomponent gas hydrate. The variable volume phase balance measurement device comprises a variable volume reactor, wherein a high pressure-resisting transparent inner cylinder of the variable volume reactor is positioned in an inner cavity of a stainless steel jacket and is coaxial with the inner cavity; a heat insulating layer is attached to the inner wall of the stainless steel jacket; a water circulation interlayer is arranged between the heat insulating layer and the high pressure-resisting transparent innercylinder; an adjustable plunger piston enters the inner part of the high pressure-resisting transparent inner cylinder through the bottom of the stainless steel jacket; a servo motor drives the adjustable plunger piston to vertically move in the high pressure-resisting transparent inner cylinder through a ball screw; a gas pipeline, a water injection pipeline and a pressure monitoring pipeline are arranged on an upper cover of the stainless steel jacket; the three pipelines are respectively communicated with the high pressure-resisting transparent inner cylinder; the side wall of the stainless steel jacket is uniformly provided with four visual windows along a circumferential direction. The variable volume phase balance measurement device disclosed by the invention can realize phase balance measurement of the gas hydrate under the variable volume condition and improves the reliability of phase balance measurement.

The invention relates to a device for fluidization loading or taking out a low-temperature protection agent for a biological tissue. The device is characterized by comprising a solution circulating module, a solution supplying module, a sample container, a temperature control box and a controller. The sample container is arranged in the temperature control box; the sample container is provided with a liquid inlet and a liquid outlet; the solution circulating module communicates with the liquid inlet and the liquid outlet of the sample container, so that a solution flows through the sample container in a circulating way; the solution supply module communicates with the solution circulating module so as to supply the solution to the solution circulating module; the controller is respectively and electrically connected with the solution supplying module, the solution circulating module and the temperature control box. According to the automation device, the threshold treatment temperature can be reduced, and meanwhile, the speed rate for loading and taking the low-temperature protection agent in and out of the biological tissue is accelerated.

The invention discloses a quantitative feeding device for agricultural breeding, and relates to the technical field of agricultural breeding. The quantitative feeding device mainly aims at solving theproblem that in existing agricultural breeding, the feeding amount is difficult to control by manually adding feed. The quantitative feeding device comprises a bottom plate, a trough and a feeding unit, wherein the trough is fixedly installed on the upper surface of the bottom plate; the feeding unit comprises a material cylinder, partition plates and a driving mechanism for driving the partitionplates to rotate; the driving mechanism comprises a standing plate, a spring, an arc-shaped rack, a single-stage flywheel, a bevel gear pair, a worm and a worm gear; and air bags for adjusting the volume are installed on the two side walls of each partition plate. The feeding unit is arranged, quantitative feeding is achieved through the weight of livestock, the automation degree is high, and thebreeding effect is good; and the air bags are arranged, the purpose of adjusting the volume of the space between the adjacent partition plates is achieved by adjusting the size of the air bags, and therefore the feeding amount is adjusted to meet the breeding requirements in different periods.

The invention discloses a measuring cup adjusting device which comprises a rotary disc, a fixing disc and an adjustable measuring cup arranged on the rotary disc. The rotary disc is connected with a rotary shaft. A fixing seat is sleeved outside the rotary shaft. The fixing seat is connected with the rotary shaft through a rolling bearing. The fixing disc is sleeved on the fixing seat in a sliding mode. The upper end and the lower end of the fixing disc are provided with an upper adjusting ring and a lower adjusting ring respectively, wherein the upper adjusting ring and the lower adjusting ring are in threaded connection with the fixing seat. The fixing disc is clamped tightly between the upper adjusting ring and the lower adjusting ring. The fixing seat is fixed on a supporting board. The fixing disc conducts vertical motion in the axial direction through the action of the upper adjusting ring and the lower adjusting ring, so that the distance between the rotary disc and the fixing disc is adjusted, the purpose that the volume of the measuring cup is adjusted is achieved, and the measuring cup adjusting device is simple in structure and the adjusting mode is convenient and rapid.

The invention provides an extension-type draw-bar box, relates to the technical field of daily necessities and aims to solve the technical problem that an existing draw-bar box is inconvenient to use.A box body of the draw-bar box consists of an upper half box shell and a lower half box shell. A vertical upper-layer sliding groove and a lower-layer sliding rail are fixed to the upper half box shell and the lower half box shell respectively, the upper half box shell is installed on the lower half box shell through cooperation of the vertical upper-layer sliding groove and a rail groove of thelower-layer sliding rail so that the upper half box shell can vertically slide relative to the lower half box shell. The upper half box shell is provided with a movable button, a locking rod is pivoted to the upper-layer sliding groove, one end of the locking rod is fixedly connected with the button, and a locking hook is formed at the other end of the locking rod. Multiple locking holes for the locking hook end of the locking rod to be clamped are formed in the lower-layer sliding rail, and the upper-layer sliding groove is provided with a locking rod return spring for driving the locking hook end of the locking rod to move towards the lower-layer sliding rail. The extension-type draw-bar box can be adjustable in size and volume according to the quantity of articles to be carried.

A heat pipe comprises a condenser, an evaporator, a working fluid, a displacement vessel and at least one connecting pipe. The volume available for the working fluid inside the displacement vessel is adjustable, said volume being adapted to change by a rotating movement of a body.In one embodiment external heat pipes allow several different heat sources to be connected. Advantages include that the capability of transferring heat can be adjusted and fine tuned to the desired value. Less force is required to rotate the body inside the displacement vessel. No energy input is required to hold the body in a desired position. The construction is simple and inexpensive to manufacture. In particular the construction is easy to manufacture in different volumes, since the diameter of the displacement vessel and rotating body can be the same but with a longer displacement vessel.

The invention discloses a self-air-inflation high-breathability shaping pillow which comprises a base plate made of silica gel. A plurality of independent and protruding upper layer silica gel air bags are arranged on one face of the base plate. Upper layer air flow channels are arranged between the upper layer silica gel air bags. A plurality of through holes communicated with the upper layer air flow channels are formed in the base plate in a penetrating mode. A concave part for placing of a human body head is arranged in the middle of the self-air-inflation high-breathability shaping pillow. The wall thickness of the upper layer silica gel air bags is 0.3 mm-2 mm, the height is 3 mm-50 mm, and the volume is 100-300000 cubic millimeters. The self-air-inflation high-breathability shaping pillow is simple in structure, good in breathability, high in comfort and capable of carrying out self inflation.

The invention discloses a braking device. The braking device comprises an air cylinder used for controlling a proportionality coefficient, wherein the air cylinder is connected with an executive component by virtue of a pipeline; the air cylinder comprises a shell which can contain gas, the shell is provided with a through hole, a connecting rod can be inserted into the interior of the shell from the exterior of the shell through the through hole, and the connecting rod and the through hole are slidably connected by virtue of a screw thread; a baffle used for adjusting the volume of the shell is arranged inside the shell; one end, inserted into the interior of the shell, of the connecting rod is connected with the baffle; the circumference of the baffle and the inner side wall of the shell are in slidably tight fit; and a sealing element used for avoiding gas leakage of the shell is also arranged at the circumference of the baffle. The braking device has the advantages that the connecting rod is adjusted, so that the volume of the shell is regulated, and then regulation on the proportionality coefficient is conveniently realized.

The invention relates to the field of luggage, in particular to a luggage box with the variable size. The luggage box includes a first shell and a second shell, the insides of the first shell and thesecond shell form a luggage placement groove, a first baffle is placed at the upper end of the luggage placement groove, the upper surface of the first baffle is hinged with the top of the first shell, the first baffle fits the inner wall of the first shell, and a groove is formed in the first baffle; the upper end of the luggage placement groove is provided with a second baffle, the first baffleand the second baffle jointly form the upper end plate of the luggage placement groove, a strip-like groove is formed in the second baffle, rubber fiber cloth used for connecting the second baffle with the second shell is arranged in the strip-like groove, and a zipper located between the second baffle and the second shell is arranged on the rubber fiber cloth. The luggage box achieves the adjustment of the size of the luggage, and the luggage box is convenient for people to use in daily life.

The invention provides a caudal vein catheterization system, and belongs to the technical field of medical experiment equipment. The caudal vein catheterization system comprises an operation table, aclamping device and an angle adjusting mechanism; a groove is formed in the top of the operation table, and the clamping device is arranged in the groove and comprises a first arc-shaped claw and a second arc-shaped claw; a hinge shaft is fixedly arranged on one side of the first arc-shaped claw in the axial direction, and two ends of the hinge shaft are respectively and rotationally connected with two ends of the groove through bearings; one side of the second arc-shaped claw is hinged to the hinge shaft, and the arc surfaces of the first arc-shaped claw and the second arc-shaped claw are opposite to each other; a plurality of clamping teeth are evenly arranged on the opposite sides of the first arc-shaped claw and the second arc-shaped claw in the length direction and are used for inserting a mouse head limiting plate and a mouse tail limiting plate; one end of each of the first arc-shaped claw and the second arc-shaped claw is provided with a clamping piece for adjusting the openingdegree; and a square groove is formed in one end of the operation table, and the angle adjusting mechanism is arranged at the bottom of the square groove and is used for adjusting the clamping deviceto rotate in the groove. According to the caudal vein catheterization system, the tail of a mouse is fixed, dosing accuracy is improved, and meanwhile, the caudal vein catheterization system conformsto the animal ethics spirit.