34results about How to "The process is simple and convenient" patented technology

The present invention provides a preparation method and application of a carbon-coated lithium sulfide hollow sphere positive electrode material, which belongs to the field of new energy technology. The lithium sulfide / carbon composite positive electrode material is composed of a carbon layer coating a lithium sulfide hollow sphere to form a three-dimensional network structure. Preparation method: lithium sulfate spheres are prepared by spray drying, and then fully mixed with a carbon source precursor and subjected to in-situ oxidation and reduction. The composite positive electrode material prepared by the present invention can effectively reduce the cost of lithium sulfide and shorten the material preparation cycle, wherein the carbon layer has a large contact area with the hollow lithium sulfide sphere, which can significantly enhance the conductivity and electrochemical activity of the material.

The present application relates to a kind of preparation method and application of metal phthalocyanine-graphite phase carbon nitride / graphene ternary composite material, it solves the problem of poor dispersibility, easy aggregation and poor conductivity of metal phthalocyanine material as electrocatalyst.Existing Preparation method steps include: metal phthalocyanine, graphite phase carbon nitride are added to sulfuric acid, after heating stirring, solution A is prepared by cooling;Solution B is prepared by stirring after adding sodium nitrite to solution A under ice bath;Graphene oxide is ultrasonically dispersed in distilled water to prepare solution C;Solution B is added dropwise to solution C and stirred, then ascorbic acid is added and stirred, the product is centrifuged, washed and dried to prepare metal phthalocyanine-graphite phase carbon nitride / graphene ternary composite material.The ternary composite material prepared by the method is a two-dimensional sheet structure, has high dispersibility, large specific surface area, good conductivity and structural stability;The product of the present application can be used for electrocatalytic reduction of carbon dioxide.

The present disclosure relates to a dual-polarized radiation unit for an antenna, an antenna and an antenna system. A dual-polarized radiation unit for an antenna includes: four dipoles, wherein radiation arms of the four dipoles are planar and symmetrical about the two mutually perpendicular lines, wherein the two mutually perpendicular lines divide the radiation unit into four regions, and a center portion of the four regions is direct current-conducting, and wherein each of the four regions has a hollow region.

The utility model relates to the technical field of unmanned aerial vehicles, and discloses a back electromotive force suppression device for a multi-rotor unmanned aerial vehicle, which comprises a vehicle body, the outer side of the vehicle body is fixedly connected with four extension arms, the bottom ends of the four extension arms are respectively provided with a driving assembly, the top ends of the driving assemblies are fixedly connected with paddles, and the blades are fixedly connected with the outer side of the vehicle body. The interior of the extension arm is slidably connected with a suppressor, the interior of the suppressor is provided with a clamping groove, the interior of the extension arm is provided with a placement groove, the interior of the placement groove is slidably connected with a clamping column, the outer side of the clamping column is fixedly connected with a pushing piece, and the interior of the placement groove is provided with a first pushing spring; the bottom end of the clamping column is rotationally connected with a driving piece. According to the utility model, the clamping column is clamped with the clamping groove, so that the suppressor can be quickly fixed and dismounted, the dismounting and maintenance process is simpler and more convenient, the maintenance difficulty is reduced, the maintenance flexibility is improved, and the downtime is shortened.

The utility model discloses a glass fiber reinforced plastic cylinder excircle glue scraping and cleaning device, which relates to the technical field of glass fiber reinforced plastic production, and comprises a mounting rack and glass fiber reinforced plastic, the two sides of the mounting rack are symmetrically and rotatably connected with mounting discs, and the side wall of one side of the mounting rack is fixedly connected with a first motor; the output end of the first motor is fixedly connected with the side wall of one mounting disc, the glass fiber reinforced plastic is arranged between the two mounting discs, the glue scraping assembly is installed at the top end of the mounting frame and used for evenly scraping glue on the outer circle of the glass fiber reinforced plastic, and the auxiliary cleaning assemblies are installed on the two sides of the glue scraping assembly and used for cleaning the outer circle of the glass fiber reinforced plastic. The blowing device is used for blowing away chippings or fiber dust generated during glue scraping and reducing adhesion; in the axial winding process of the glass fiber reinforced plastic, the glue scraping box reciprocates left and right along the outer ring wall of the glue scraping box, uniform glue scraping is continuously carried out, compared with manual glue scraping, the process is simpler and more convenient, and the product quality is guaranteed.

The application discloses a model-driven neural network-based offset min-sum LDPC code decoding algorithm and relates to an offset min-sum LDPC code decoding algorithm. The application is designed to solve the problems of the traditional LDPC decoding algorithm in convergence speed, calculation complexity, flexibility and the like. The application comprises the following steps: 1, a model-driven offset min-sum algorithm network model is constructed, wherein the network model comprises an input layer, a check node layer, a variable node layer and an output layer; 2, the input layer is used to calculate the received channel LLR by using a received signal y to perform initialization; 3, the check node layer is used to calculate the CN-to-VN LLR value; 4, the variable node layer is used to calculate the VN-to-CN LLR value; and 5, the output layer is used to calculate a final decoding output. The application belongs to the technical field of decoding.

A kind of preparation method of super copper / carbon nanotube composite material, by the treatment of strong oxidant potassium permanganate and hydrogen peroxide, carbon nanotube is oxidized and peeled off, and high-dispersity oxidized and peeled off carbon nanotube aqueous solution is obtained, copper, the precursor of oxidized and peeled off carbon nanotube composite material is co-deposited using pulse electrodeposition method, and super copper / carbon nanotube composite material is obtained by annealing-rolling-annealing treatment.Oxidized and peeled off carbon nanotube is inserted in copper matrix, and uniform distribution is realized.In addition, pulse electrodeposition process and annealing treatment can effectively reduce the oxygen content of composite material and optimize material structure.Therefore, the super copper / carbon nanotube composite material of the present application is superior to the characteristics of pure copper in electricity, heat and mechanics, and the preparation method is simple and easy to operate, and has good and wide application prospect in the field of electronic power, energy and other related fields.

The utility model discloses a photoresist spin coating cleaning device. Comprising a spin-coating unit for coating a substrate with glue, a workbench is arranged under the spin-coating unit, a bearing unit for driving the substrate to ascend, descend and rotate is installed on the upper surface of the workbench, a baffle formed by enclosing is arranged on the periphery of the bearing unit, and the baffle is fixedly connected with the upper surface of the workbench and forms a dissolving tank with an upward opening. A dissolving solution for dissolving residual glue on the side wall of the substrate is injected into the dissolving tank, the bottom of the dissolving tank is communicated with an activated carbon adsorption column, one end of the activated carbon adsorption column is communicated with a circulating unit, and the liquid outlet end of the circulating unit is aligned with the substrate, so that the treated dissolving solution secondarily cleans the substrate. The photoresist spin-coating cleaning device solves the technical problem that the photoresist remains on the side surface of the substrate after spin-coating and is difficult to clean.

The embodiments of the present disclosure disclose a line laser module and a self-moving device. The line laser module comprises: a fixing base, and a photographic apparatus and a line laser emitter, which are arranged on the fixing base, wherein the line laser emitter is located at at least one side of the photographic apparatus, and is used for emitting a laser, the projection of which is of a line shape, and the photographic apparatus operates in mutual cooperation with the line laser emitter, and is used for collecting an environment image; and an infrared filter is arranged in front of the photographic apparatus, such that only infrared light can enter the photographic apparatus. The self-moving device comprises an infrared light supplement lamp, and the photographic apparatus respectively collects, at different time points, a first environment image for ranging and a second environment image for article recognition.

This application discloses a dry connection structure for a prefabricated double-sided composite shear wall and a prefabricated beam, including a double-sided composite shear wall, a prefabricated beam, and multiple fasteners. The double-sided composite shear wall has a slot extending along its thickness direction. A beam end connector is provided at the end of the prefabricated beam, which is inserted into the slot. The beam end connector has multiple mating plates, each located in a different plane and conforming to the inner wall of the slot, forming an operating cavity between the mating plates. Each fastener passes through the corresponding mating plate from one side of the operating cavity and connects to the double-sided composite shear wall. The dry connection structure for the prefabricated double-sided composite shear wall and prefabricated beam provided by this application simplifies the pre-connection process, eliminating the need for specialized welding technicians. The multiple mating plates of the beam end connector conform to the inner wall of the slot, providing multi-directional positioning and easily ensuring accurate pre-installation of the double-sided composite shear wall and prefabricated beam.

The present application relates to a kind of functionization outer diameter unequal thickness magnetic ring and its magnetizing method, belong to permanent magnet motor technical field, the inner diameter of unequal thickness magnetic ring is circular, and the outer diameter is change curve, wherein, the change curve of outer diameter is constant in main magnetic pole portion thickness, and the thickness is reduced in the transition position between adjacent main magnetic pole portion;The unequal thickness magnetic ring adopts bonded neodymium iron boron material.The present application is composed of a functionization outer diameter bonded neodymium iron boron magnetic ring and its matching multipole magnetizing fixture, wherein the outer diameter of magnetic ring adopts two kinds of functionization size, by reducing the thickness of magnetic pole transition area, the harmonic component of surface magnetism of magnetic ring is controlled, and the amplitude of cogging torque is reduced.The multipole magnetizing core of matching magnetizing fixture can magnetize magnetic ring into surface alternately distributed multiple magnetic poles.

The invention relates to a device (10) for nerve stimulation having an electrically conductive stimulation wire (20) having a diameter (AD), a distal end (20a) and a proximal end (20b), the stimulation wire being arranged in an electrically insulating hose (40) having an inner diameter (IS), an outer diameter (AS), a distal end (40a) and a proximal end (40b), the inner diameter of the hose being greater than the diameter of the stimulation wire, so that a gap (46) for supplying a fluid is formed in the hose, a stimulation electrode (30) is arranged at the distal end of the stimulation wire in an electrically conductive manner, which stimulation electrode projects beyond the distal end of the hose, and wherein the proximal end of the stimulation wire projects beyond the proximal end of the hose and is guided to the outside of the hose in a curved manner about the proximal end of the hose, and wherein an electrically conductive stimulation cable (50) is electrically conductively connected to the proximal end of the stimulation wire, and wherein the stimulation electrode (30) is electrically conductively connected to the proximal end of the stimulation wire. An injection hose (60) is sectionally sleeved on the proximal end of the hose to form a seal.

The utility model discloses an integrated water meter well relates to water meter well technical field, this integrated water meter well, including well body, water distributor no.

The utility model relates to the technical field of fixing plates, and discloses a plastic plate fixing structure of an automobile audio, which comprises an automobile audio body and a fixing plate assembly, the automobile audio body is positioned on the left side of the fixing plate assembly, and the fixing plate assembly comprises a first fixing plate and a second fixing plate. The rear side ends of the first fixing plate and the second fixing plate are rotationally connected together, and limiting clamping grooves capable of conducting positioning are formed in the wall faces, close to each other, of the first fixing plate and the second fixing plate. When the automobile sound equipment body and the fixing plate assembly need to be connected together, the limiting column can be rotated in the forward direction until the limiting column is separated from the positioning connecting groove, then the limiting column is turned leftwards, the first connecting plate drives the connecting bolt to rotate until the limiting column is far away from the second connecting plate, and then the first fixing plate and the second fixing plate are turned over and separated; then the outer wall of the automobile sound equipment body is clamped into the two limiting clamping grooves, and then the first fixing plate and the second fixing plate are connected together.

The invention provides bis (phthalazinone) structure polymer toughened bismaleimide resin as well as a preparation method and application thereof, and relates to the technical field of high polymer material synthesis. The bis (phthalazinone) structure polymer toughened bismaleimide resin is mainly prepared from a bismaleimide monomer, an allyl compound, a bis (phthalazinone) structure polymer, other optional thermoplastic resin toughening agents, an optional co-curing component and an optional curing agent, the bis (phthalazinone) structure polymer has excellent heat resistance and good solubility, the heat resistance of the bis (phthalazinone) structure polymer is matched with that of high-temperature-resistant bismaleimide resin, and the bis (phthalazinone) structure polymer can be used as a toughening agent to remarkably improve the impact toughness of the bismaleimide resin and a composite material thereof and maintain the excellent heat resistance of the bismaleimide resin; therefore, the bismaleimide resin can be suitable for more application scenes.

The utility model provides a fixing structure for an advertisement sign, which comprises a base and two mounting seats, a mounting frame is fixedly mounted on the base, adjusting components are arranged on the two mounting seats, each adjusting component comprises a rotating gear, a bidirectional rack plate, a rack plate and a movable plate, and the rotating gear is fixedly mounted on the mounting frame. The interiors of the two mounting bases are rotationally connected with rotating shafts through bearings correspondingly, and gears are fixedly mounted on the rotating shafts. By arranging an adjusting assembly, a rotating hand wheel and limiting a bidirectional rack plate, under the cooperation of a gear, two movable plates cannot move, so that the positions of two mounting plates are fixed, a user is allowed to carry out accurate adjustment according to the size of the identification label, it is ensured that the identification label can be stably and horizontally mounted, and the working efficiency is improved. The device is simple in structure and convenient to use, can adapt to the identification labels of various sizes, reduces the requirement for replacing the device due to size mismatching, meanwhile, enables the identification labels to be easy and rapid to install and detach, saves time and labor cost, and improves working efficiency.

The utility model provides an intelligent connection stabilizing device for a switch, which relates to the technical field of switch equipment, and comprises a machine body, the top of the machine body is connected with an L-shaped flip cover through a hinge, the front surface of the machine body is provided with a transmission interface, the front surface of the transmission interface is connected with a transmission joint in an inserted manner, and the transmission interface and the transmission joint are both inverted T-shaped. The equipment mainly provides an automatic back-insertion structure to prevent the transmission connector from loosening from the transmission interface and being unable to return automatically, and through the sliding connection and cooperation of the sliding rails and the sliding grooves, when the transmission connector is loosened, the transmission connector only moves horizontally to be loosened, keeps horizontal all the time, does not bend down, and is easily pushed by subsequent assemblies. When the inner touch control switch pops up, the signal transmitter can be controlled to transmit instruction signals to the signal receiver of the air cylinder controller, the inner touch control switch is similar to a switch of an electric lamp and is a starting button, and the signal receiver is matched with the signal transmitter.

The utility model discloses a small -size sample grinding equipment relates to plant sample preparation technical field, and the device includes support platform: the top fixedly connected with the grinding jar of collection box is linked with its intercommunication, the top cover of grinding jar is covered with the closure, the top fixedly connected with the fixed frame of closure, the inner chamber of grinding jar is provided with grinding assembly, grinding assembly includes the rotary column of rotary connection in the inner chamber of grinding jar, the bottom fixedly connected with the grinding ball of rotary column surface, the surface of grinding ball is provided with a plurality of annular distribution's blanking groove, the inner chamber rotationally connected with drive column of fixed frame. The cooperation of servo motor, drive bevel gear and force bevel gear can be used in this application, improves the driving source, under the cooperation of grinding assembly and grinding jar, the plant frozen block is ground, and under the cooperation of collection box and blanking box, the powdered plant frozen block is collected and stored, and the purpose of easy to grind sample preparation and grinding is reached.

The present invention belongs to the field of cell culture technology, and specifically relates to a cryopreservation protection solution and a cryopreservation method for adipose mesenchymal stem cells. The cryopreservation protection solution for adipose mesenchymal stem cells includes a basal liquid, a nutrient agent and an antifreeze agent; the basal liquid is: a culture medium; the nutrient agent is: transferrin, linoleic acid, cholesterol; the antifreeze agent is: hydroxyethyl starch, bergenia lactone, geraniol. The cryopreservation protection solution provided by the present invention adds a nutrient agent and an antifreeze agent to the basal liquid culture medium, especially the added antifreeze agents hydroxyethyl starch, bergenia lactone, and geraniol, which can effectively reduce the damage caused to cells during the cryopreservation process, improve the activity of frozen cells after recovery, and effectively ensure that the adipose mesenchymal stem cells after cryopreservation can still be used in scientific research or clinical practice. The present invention also provides a cryopreservation method for adipose mesenchymal stem cells, which is simple in process and easy to operate.

The invention discloses a method, a device, equipment and a medium for realizing operator cold number recovery and reuse. The method comprises the following steps: firstly, obtaining a to-be-recovered and reused number in an operator cold number recovery and reuse order; then, using Selenium to simulate browser operation to execute recovery operation on the to-be-recovered and reused number, and obtaining a recovery result of the to-be-recovered and reused number; then simulating browser operation through Selenium to execute allocation operation to obtain an allocation result of the number to be recycled and reused; then state checking operation is carried out on the to-be-recycled and reused number to obtain the to-be-recycled and reused number which is successfully allocated; and finally, outputting the successfully allocated to-be-recycled and reused number, so that a shop assistant opens an account for the successfully allocated to-be-recycled and reused number, thereby completing the recycling and reuse of the operator cold number based on Selenium. According to the method, the cold number recovery and reuse of the operator are realized based on Selenium, and the efficiency and accuracy of the operator in the cold number recovery and reuse process can be remarkably improved.

The utility model discloses a miniature circuit breaker convenient to maintain, which relates to the field of circuit breakers and comprises a circuit breaker main body, two wiring terminals are movably mounted in the circuit breaker main body, a fixing assembly is movably mounted on the circuit breaker main body at the same time, and the fixing assembly is composed of an insulating connecting rod, a first spring, a connecting plate, a connecting rod and a connecting latch. The number of the insulating connecting rods, the number of the first springs, the number of the connecting plates, the number of the connecting rods and the number of the connecting latches are all two, the insulating connecting rods are fixedly installed at one ends of the wiring terminals, the insulating connecting rods are sleeved with the first springs, and the fixing assembly is arranged on the circuit breaker body and connected with the two wiring terminals at the same time. When the circuit breaker body needs to be separated from the electric wires, the fixing assembly can be pushed by hands, so that the two wiring terminals are pushed to move through the fixing assembly at the same time, fixed connection between the circuit breaker body and the two electric wires is removed at the same time, the process is simple and convenient, and finally maintenance of the circuit breaker body is facilitated.

There is provided an information processing apparatus including: a readout section configured to read out a tree-structured learned model that is obtained by performing a learning process on a tree-structured model by using a first data set; a leaf node identification section configured to input a second data set to the tree-structured learned model and identify a first leaf node that is a leaf node corresponding to the second data set in the tree-structured learned model; and a ratio information generation section configured to generate information related to a ratio between a number of all leaf nodes of the tree-structured learned model, and a number of the first leaf nodes or a number of second leaf nodes. The second leaf nodes are leaf nodes that do not each correspond to the first leaf node among the leaf nodes of the tree-structured learned model.

The utility model discloses an application for peritoneal dialysis, which belongs to the field of medical application and comprises an application body, a notch, a protective shell, a screwing cylinder, a pressing plate, a seepage plate, a threaded cylinder, a feeding nozzle, a top block, a leak hole, a spring and a supporting block. During use, concentrated sodium chloride prepared in advance is injected into the protective shell through an injector, the screwing barrel is rotated after the concentrated sodium chloride is injected, the screwing barrel rotates on the threaded barrel and moves towards the application body at the same time, and the pressing plate is driven to move by the screwing barrel; the pressing plate moves to extrude concentrated sodium chloride located in the protective shell, so that the concentrated sodium chloride permeates into the application body through the seepage plate, the tunnel portal of a patient can be applied after permeation is completed, the whole process is simple and convenient, the patient can conduct wet application at home, the time for the patient to go to a hospital is shortened, and the patient experience is improved. And convenience is provided for the daily life of the patient.

The invention discloses a steam turbine defect composite voiceprint diagnosis device, and particularly relates to the technical field of steam turbine diagnosis, the steam turbine defect composite voiceprint diagnosis device comprises a track body, a diagnosis assembly, a mounting and dismounting mechanism and a telescopic assembly; the diagnosis assembly is arranged on the track body; the diagnosis assembly comprises a moving plate, a base, a rotating arm A, a connecting arm, a rotating arm B, a fixed plate, a voiceprint detector, a vibration sensor and a camera body; the moving plate is slidably arranged on the track body through the driving assembly. The base is connected with the moving plate through the mounting and dismounting mechanism; the rotating arm A is rotationally connected with the base through a rotating motor A; the connecting arm is arranged above the rotating arm A; the rotating arm B is rotationally connected with the connecting arm through a rotating motor B; the fixed plate is arranged on one side of the rotating arm B; the voiceprint detector, the vibration sensor and the camera body are all arranged on the fixing plate; the device is reasonable in structural design, capable of achieving efficient, continuous and automatic monitoring, comprehensive in coverage and low in use cost, and the diagnosis accuracy is greatly improved.

The utility model discloses a hotpot condiment cutting device, which relates to the technical field of hotpot condiment preparation and comprises a containing plate, a platform, a clamping mechanism, a positioning mechanism and a cutting mechanism. The containing plate is placed on the platform, and solid hotpot condiments are contained in the containing plate; the positioning mechanism comprises a telescopic assembly and a positioning plate connected with the telescopic assembly. The positioning plate is used for being tightly attached to the rear wall of the containing disc. The clamping mechanism is used for clamping and fixing the right wall and the left wall of the containing disc. The cutting mechanism is located over the containing disc, comprises a lifting assembly and a cutting part and is used for automatically cutting the hotpot condiment. According to the scheme, the containing disc is very simple and convenient to place; the cutting mechanism can automatically cut the hotpot condiment without manual operation; and after cutting is completed, the clamping mechanism loosens the containing disc, the telescopic assembly extends, and therefore the containing disc is pushed out from the position below the cutting mechanism, and the process of manually pulling the containing disc is omitted.

The application provides a non-noble metal catalyst and a preparation method and a method for preparing aromatic amines by catalytic transfer hydrogenation reduction of aromatic nitro compounds, and relates to the technical fields of catalysis and organic synthesis. The non-noble metal catalyst provided by the application comprises carbon cloth and iron trioxide loaded on the carbon cloth. The application provides application of the non-noble metal catalyst in preparation of aromatic amines by catalytic transfer hydrogenation reduction of aromatic nitro compounds. The catalyst is used in preparation of aromatic amines by catalytic transfer hydrogenation reduction of aromatic nitro compounds, and high-pressure environment is not needed, the condition is mild, reduction of different aromatic nitro compound substrates can be realized, and the catalyst has the characteristics of high catalytic activity, high selectivity and recyclability. The results of examples show that when the catalyst is used in preparation of aromatic amines by catalytic transfer hydrogenation reduction of aromatic nitro compounds, the conversion rate of the aromatic nitro compounds is 85-95%, and the selectivity of the corresponding product aromatic amines is 90-98%.

The application provides a signal long-time accumulation detection method, comprising the following steps: receiving echo data, filtering and matching the received echo data, using a Fourier transform method to obtain a coherent accumulation result of each frame from the filtered and matched echo data, using a velocity interval segmentation method to correct Doppler distance of the coherent accumulation result, performing modulus superposition on the corrected Doppler distance to obtain a non-coherent accumulation result, detecting the non-coherent accumulation result, and selecting a larger non-coherent accumulation result as an output result. The signal long-time accumulation algorithm has the advantages of small calculation amount, small required cache space and the like, and is suitable for engineering application of a general detection system radar.

The invention discloses a synthetic method of 4, 4 '-dihydroxybiphenyl. The method comprises the following steps: mixing 4, 4 '-dinitrobiphenyl, a metal catalyst and an organic solvent, introducing hydrogen, and carrying out hydrogenation reduction reaction to obtain 4, 4'-diaminobiphenyl; the preparation method comprises the following steps: mixing 4, 4 '-diaminobiphenyl and a silicon dioxide grafted modified multi-branched carboxylic acid polymer, carrying out a heating reaction, and removing a solvent from a reaction solution to obtain 4, 4'-dihydroxybiphenyl. 4, 4 '-dinitrobiphenyl is used as a substrate of the reaction, and an intermediate 4, 4'-diaminobiphenyl is obtained after hydrogenation reduction; the target product 4, 4 '-dihydroxybiphenyl is synthesized by taking the silicon dioxide grafted and modified multi-branched carboxylic acid polymer as a hydrolysis reagent, so that the efficiency and selectivity of the reaction for preparing the 4, 4'-dihydroxybiphenyl are effectively improved, the reaction condition is mild, the operation process is simple and convenient, and the method has wide industrial application potential.

The utility model belongs to the technical field of lamps, and provides a lampshade-replaceable lighting device which comprises a base, a lamp body, an aluminum substrate, a diffusion cover and a transparent cover, the lamp body is mounted on the base, a mounting groove is formed in the side, away from the base, of the lamp body, and a first clamping block is arranged on the bottom wall of the mounting groove; a second clamping block is arranged on the side wall of the mounting groove; the aluminum substrate is mounted in the mounting groove; the diffusion cover is mounted in the mounting groove, a clamping hole is formed in the diffusion cover, and the clamping hole is connected to the first clamping block in a clamped mode; the transparent cover is installed in the installation groove, the diffusion cover is covered with the transparent cover, the transparent cover is provided with a clamping groove, and the clamping groove is connected to the second clamping block in a clamped mode. The structure is simple and compact, the transparent cover is easy and fast to disassemble and assemble, a user can replace the transparent cover by himself / herself conveniently, and the application scene is wide.

The utility model relates to injection device field, concretely is a device and pre -filled syringe of having anti -stab protection, the device of having anti -stab protection includes medicine storehouse shell, hidden needle cover, hidden needle connecting rod, connecting rod spring, medicine bottle support, medicine bottle gland, hidden needle limiting piece and pre -filled medicine bottle, hidden needle cover and hidden needle connecting rod connect and set up in medicine storehouse shell, the one end of hidden needle connecting rod is away from hidden needle cover and is sequentially provided with hidden needle limiting piece and medicine storehouse gland, be provided with the knob on hidden needle limiting piece, the knob drives hidden needle limiting piece rotation, limit or release hidden needle connecting rod's axial movement, hidden needle connecting rod and pre -filled medicine bottle cover set up in medicine bottle support, and connecting rod spring is arranged between hidden needle connecting rod and medicine bottle support, the fixing of hidden needle cover is realized through the clamping of hidden needle connecting rod and hidden needle limiting piece, and further avoid needle head to expose outside hidden needle cover, prevent needle head from being hurt by mistake. Reset through the device elasticity, the process is simple, and the degree of automation is high, and the user operation difficulty is low.