38results about How to "Complete form" patented technology

The present invention relates to the technical field of concrete curing, and specifically to a concrete curing device for building construction, comprising a base and a placing bin arranged on the base, wherein an L-shaped supporting plate is movably arranged on the placing bin, a placing assembly is symmetrically arranged on the L-shaped supporting plate, a plastic film is arranged on the placing assembly, a water tank is arranged on the placing bin, and the placing assembly comprises a baffle plate symmetrically arranged on the L-shaped supporting plate, a placing plate arranged on one side of the baffle plate, a rotating plate movably arranged on the placing plate, and a movable seat movably arranged on an end of the rotating plate away from the placing plate. The present invention can provide a relatively closed environment for the plastic film, effectively isolate it from external moisture and dust, thereby protecting the plastic film from moisture and dust, so that it can be taken and used at any time, and at the same time, it can also avoid the risk of interaction with other construction equipment during the taking process, which may cause injury to the staff.

The invention discloses a preparation method of a seawater shellfish single-cell suspension suitable for dynamic detection. The preparation method comprises the following steps: extracting gill filament tissues from living shellfish; washing gill filaments, and absorbing moisture; cutting the gill filament tissue into pieces; carrying out enzymolysis digestion on the gill filament tissue fragments by using an enzyme mixed solution consisting of collagenase II, hyaluronidase and deoxyribonuclease I; centrifuging and resuspending the cells; and filtering to obtain a single-cell suspension. Aiming at the condition that the shellfish tissue structure is relatively loose, cleaning liquid, enzyme liquid components, enzymolysis time, centrifugal speed and the like are optimized, and the high-quality single-cell suspension is obtained. According to the preparation method of the single-cell suspension, non-lethal sampling of seawater shellfish is conducted, the requirement for dynamic detection of shellfish traits in the industry can be met, enzymolysis is more sufficient, experiment time is shorter, operation steps are simple and convenient, obtained cells are more complete in morphology, the caking rate is extremely low, and the living cell rate is higher; and the requirements of construction of various single cell sequencing platform libraries can be fully met.

The invention belongs to the technical field of photocatalytic materials, and provides a foamed ceramic-based catalyst as well as a preparation method and application thereof. The method comprises the following steps: S1, sequentially carrying out surface alkali treatment, surfactant modification and surface grafting modification on an organic foam template to obtain a modified foam template; s2, preparing a plurality of ceramic slurry with different solid contents, wherein the ceramic slurry comprises the following components: a binder, a rheological agent, a dispersant, a plasticizer, a zirconium oxide stabilizer, zirconium oxide, manganese dioxide, titanium dioxide, silicon dioxide and a solvent; s3, according to the slurry hanging sequence of the solid contents from high to low, ceramic slurry with different gradient solid contents is sequentially coated and hung on the surface of the modified foam template, drying and sintering are conducted, and the foamed ceramic-based catalyst is obtained. According to the invention, the surface of the organic foam template is modified, the components of the ceramic slurry are reasonably designed, and the ceramic slurry with gradient solid content is adopted for multiple times of slurry hanging, so that the porosity and compression strength of the foamed ceramic-based catalyst are simultaneously improved.

This invention provides a high-hygroscopic, water-free composite gel-type calcium and magnesium salt tablet and its preparation method, which is made from the following raw materials in parts by weight: 45-70 parts calcium and magnesium salt, 15-25 parts gum arabic, 3-15 parts mica powder, 2-12 parts polyethylene oxide, 0.5-2 parts sodium nitrite, and 2-30 parts gelatin. This tablet exhibits high hygroscopicity and excellent physical properties.

The application discloses a kind of coronary angiography three-dimensional reconstruction method and system, it is related to medical image processing technical field, including: obtaining multi-angle coronary DSA angiography projection image and executing pre-processing, extract blood vessel initial center line and both sides initial contour, calculate each section contrast agent relative concentration, combined with blood vessel local curvature, concentration difference sign change and anatomical feature adaptive segmentation blood vessel section, filter reliable reference side and generate mirror virtual contour, calculate three kinds of contour deviation, construct multi-constraint objective function and correct center line section by section, integrate corrected center line and fit lumen parameter, solve blood vessel feature point three-dimensional coordinate and complete three-dimensional reconstruction.The application has the advantages that: effectively suppress the center line deviation caused by contrast agent concentration uneven, consider correction accuracy and blood vessel form continuity, the size of three-dimensional model output is accurate, topological correct, can be directly used for clinical quantitative diagnosis and interventional operation planning.

This utility model relates to the field of biomedical technology and discloses a professional shaker for gynecological liquid-based cytopathology, comprising a base, an outer shell, an inner shell, and a support assembly. A vibrating base plate is mounted on the top of the base, and a vibrating assembly is mounted on the bottom of the vibrating base plate, located within the inner cavity of the base. The outer shell is mounted on the top surface of the vibrating base plate, and a top cover is detachably connected to the top of the outer shell. A first magnetic connection part is mounted on the bottom of the inner side wall of the outer shell. The inner shell is located within the inner cavity of the outer shell, and a second magnetic connection part is mounted on the bottom of the outer side wall of the inner shell, magnetically connected to the first magnetic connection part. The top of the inner shell contacts the top cover. The support assembly is mounted on the inner wall of the inner shell, and several cell fluid tubes are detachably connected to the support assembly. This utility model enables precise vibration and temperature control, allowing for the simultaneous and efficient processing of multiple gynecological samples, thus improving work efficiency.

This invention discloses a method and system for defect identification of molybdenum-rhenium alloy pipe fittings based on high-definition microscopic images. The method includes the following steps: acquiring high-definition images of the molybdenum-rhenium alloy pipe fittings using a high-definition microscope; preprocessing the high-definition images of the molybdenum-rhenium alloy pipe fittings to obtain an image of the molybdenum-rhenium alloy pipe fittings to be detected; performing region growing algorithm processing on the image of the molybdenum-rhenium alloy pipe fittings to be detected to obtain a defect region to be detected; identifying defects in the defect region to be detected to obtain the type of defect; and determining that the molybdenum-rhenium alloy pipe fittings has a defect problem based on the type of defect.

The invention relates to a wetting liquid formula for improving a sample preservation effect and a preparation method. The wetting liquid formula comprises 15-50% of an anti-aggregation reagent; 5%-10% of a buffer solution; 1%-20% of an ionic strength maintaining reagent; 0.01% to 0.5% of an antimicrobial agent; 0.1%-5% of a mucus dissolving reagent; 0%-0.5% of a cleaning agent and 0.1%-0.5% of penicillanes The content percentage is calculated according to the amount of the prepared 1L solution. The sample conveying time efficiency and stability can be improved, and more flexible sample treatment and sample conveying time can be provided for a user.

A yeast cell microinjection method and system based on quartz nanoinjection needle belong to the field of microbial single cell operation and microinjection technology. It includes: preparing high rigidity quartz nanoinjection needle and holding needle; biochemical weakening pretreatment is carried out on yeast cells to weaken the cell wall; a microdroplet environment is constructed in a culture dish; single cells are fixed by negative pressure suction in the microdroplet, the quartz nanoinjection needle loaded with injection material penetrates the weakened cell wall in the axial direction, and the material is delivered by positive pressure; the needle is withdrawn and the cell is released. The microinjection method is realized by the yeast cell microinjection system. The high bending stiffness quartz nanoinjection needle is combined with the cell wall weakening treatment, and the stable, low damage puncture of the small size and high rigidity yeast cell is realized; at the same time, the stable osmotic pressure and operation culture space are provided by the microdroplet environment, which is suitable for gene operation and accurate delivery of material at single yeast cell level.

The utility model relates to tofu processing technical field discloses a kind of box turning and dividing machine for bean brain forming processing, including translation frame and rack, the bottom of the one side of translation frame is equipped with box turning and tearing cloth track, the top of the other side of translation frame is equipped with tearing cloth and puts on turning plate track, the inside rotation of translation frame is equipped with rotating cage, the inside fixed of rotating cage is equipped with moving rail, the inside sliding of moving rail is equipped with box turning and transverse movement trolley, the sliding of box turning and transverse movement trolley inside is equipped with tofu longitudinal movement trolley, the top of rack is equipped with longitudinal fixed knife, the top of rack is equipped with transverse moving knife;The utility model is linked by rotating cage, box turning and transverse movement trolley, tofu longitudinal movement trolley, realize tofu from tearing cloth, overturn, cutting to the one-stop automation operation of reset, replace traditional manual handling, face and cutting process, reduce process linkage time, improve unit time production capacity.

Embodiments of the present application relate to the field of data processing, and disclose a cutting path generation method, a cutting method, a system, an electronic device and a medium. The cutting path generation method of a tooth corrector comprises: acquiring cutting path information of a to-be-cut pressure film assembly and a target cutting position of the pressure film assembly, the cutting path information containing cutting speeds of each cutting point; when the cutting speeds of each cutting point meet preset change conditions, acquiring point offset information of each cutting point according to preset laser cutting parameters, the cutting speeds of each cutting point and the target cutting position; adding the point offset information to the cutting path information to generate updated cutting path information. In this way, when the cutting speed meets the conditions, the cutting point is offset, the laser spot power density at the offset cutting point is reduced, the energy accumulation problem caused by the slow cutting speed can be eliminated, and a tooth corrector that meets the user's correction requirements and has a complete shape can be generated.

The application discloses an engineered exosome targeting human urokinase-type plasminogen activator receptor uPAR and a preparation method and application thereof. Firstly, a high-affinity anti-human uPAR single-domain antibody VHH is prepared; then, a human umbilical cord mesenchymal stem cell engineering cell line expressing a VHH-PTGFRN fusion protein is constructed, and the engineered exosome is prepared and purified by combining three-dimensional hypoxic culture, chemical induction and size-exclusion chromatography technology. The engineered exosome comprises four comparative samples, wherein the core sample Exo^(VHH / miR) can simultaneously display the anti-uPAR VHH on the membrane surface to realize targeted delivery and enrich miR-193b-3p in the chamber to realize gene silencing, and the synergistic effect of the two can efficiently remove the uPAR high-expression senescent cells and inhibit the senescence-associated secretory phenotype SASP. The engineered exosome has the advantages of standardized preparation process, high yield and high purity, strong targeting, excellent curative effect and good safety, and can be used for preparing a treatment preparation for anti-aging and aging-related diseases, and has important clinical application value.

The utility model discloses a crop underground biomass collecting device. Comprising a cylinder, meshes and a mesh bag. The barrel is provided with a cavity, a top opening and a bottom opening, and the top opening and the bottom opening are both communicated with the cavity. The net piece is arranged on the cylinder body, the net piece covers the bottom opening, the net bag can be contained in the cavity, and the net bag can be contained in or taken out of the cavity. According to the crop underground biomass collecting device, in the operation process of an experiment, firstly, the barrel is buried in a field, the barrel and the mesh bag are filled with soil, and crops are planted in the soil in the mesh bag. After the crops grow for a certain period of time, the barrel body, the mesh sheets, the mesh bag and the crops in the barrel body are taken out of the field at the same time. The part, located above the soil, of the crop is cut off, the soil in the cylinder is removed in the modes of vibration, cleaning and the like, and clean crop roots with complete forms are left in the mesh bag. The crop root system is used for observation and experiment in the next step, and it can be guaranteed that observation and experiment results are more accurate.

The invention relates to the technical field of meat product segmentation, and discloses a meat product segmentation platform with a sterilization structure, the meat product segmentation platform comprises a main pipeline, two ends of the outside of the main pipeline are provided with a feeding bin and a discharging bin, the bottom of the main pipeline is fixedly connected with a drainage pipe, and the main pipeline is provided with a segmentation mechanism for segmenting meat on one side of the discharging bin; a feeding mechanism is arranged in the main pipeline, a plurality of ultraviolet lamp strips are fixedly connected to the interior of the main pipeline, and a steam disinfection mechanism is arranged in the main pipeline. The cutting knife is driven by the rotating ring and the connecting rod to conduct centrifugal or centripetal deflection, so that meat products are cut, in the cutting process, the whole cut deviates inwards, and after cutting is completed, the whole cut is in the center gathering state, and therefore the exposed area of the cut is effectively reduced, the probability that the meat products are polluted by bacteria is reduced, and the cutting quality of the meat products is improved. And moreover, the whole shape of the meat product is more complete due to the inwards-contracted notches.

The utility model discloses a stable support convenient for peeling vegetables, which comprises a cutter frame, the upper end of the cutter frame is fixedly provided with a cross rod, and the two sides of the cross rod are respectively provided with a cutter mechanism in a sliding manner; the base is connected with the bottom end of the tool frame through a connecting part; the stabilizing mechanism is arranged on the base in a sliding manner; the clamping mechanisms are configured to be two groups, and the two groups of clamping mechanisms are slidably arranged on the positions, located on the two sides of the stabilizing mechanism, of the base correspondingly; the stabilizing mechanism comprises a stabilizing frame, an arc-shaped seat is arranged at the bottom end in the stabilizing frame, a mounting cavity is formed in the inclined part of the stabilizing frame, and a concave part is arranged at the upper section position of the middle of the stabilizing frame; the control cavity is formed in the arc-shaped seat; the slide way is formed in the inner side of the control cavity; the downward pressing assembly is mounted on the sunken part; and the stability augmentation assembly is arranged in the mounting cavity, and a general control part is connected between the pressing assembly and the stability augmentation assembly.

The present invention discloses a modular cement embankment brick production mold with an interlocking structure, including a forming mold and an upper mold located above the forming mold, wherein the forming mold is provided with a forming cavity, the upper mold is provided with a receiving cavity corresponding to the forming cavity, the receiving cavity is provided with an extrusion block consistent with the shape of the forming cavity, the extrusion block extends downward into the forming cavity under the action of an external force to extrude and mold the material in the forming cavity; the upper mold is provided with a feeding channel, and the feeding channel is used to introduce the connected cement mortar into the forming cavity below the receiving cavity for molding. The present invention facilitates the material to fully fall into the forming cavity and extrude the material in the forming cavity by moving the extrusion block downward from the receiving cavity to the forming cavity, so that the molding is more complete; in the process of the driving device driving downward, the scraping of the receiving cavity and the extrusion of the forming cavity are automatically completed.

The present invention is a divisional application with application number 202010060063.1, and the present invention relates to the use of a lectin-macromolecular carrier coupling complex in isolating glycosylated exosomes from clinical samples, wherein the lectin-macromolecular carrier coupling complex comprises: a macromolecular carrier; and a lectin coupled to the outside of the macromolecular carrier. The lectin-macromolecular carrier coupling complex provided by the present invention can easily, quickly and accurately separate glycosylated exosomes from clinical samples, with high separation efficiency and good repeatability. The separated exosomes are in complete morphology without rupture or fragmentation, and can be directly used for glycosylated exosome liquid detection, or directly for immunological related detection, or directly extracting related nucleic acids in exosomes for genetic detection and analysis.

The present application relates to the technical field of metal magnesium production, and particularly relates to a metal magnesium vertical reduction furnace loading structure and method, wherein the loading structure comprises a spherical charger, the spherical charger is provided with a magnesium vapor overflow hole, the spherical charger is filled with pellet material, a plurality of spherical chargers are connected by steel ropes one by one, and the plurality of spherical chargers are arranged in a reduction tank during processing of the reduction furnace. The spherical charger is filled with pellet material, and the spherical charger is arranged in the reduction tank, so that the problem of difficulty in magnesium vapor overflow, low reduction efficiency and slag sticking caused by falling and crushing of the pellet material when the pellet material is directly poured into the reduction tank is solved.

The invention relates to the technical field of spleen and stomach nourishing pastries, in particular to a formula and a preparation process of a spleen and stomach nourishing pastry with homology of medicine and food. The cake is prepared by mixing the following raw materials by weight: 18-45 g of wheat flour, 4-18 g of glutinous rice flour, 3-18 g of Chinese yam powder, 2-20 g of dried orange peel powder, 2-18 g of lotus seed powder, 1-15 g of hawthorn powder, 180-300 g of eggs, 15-55 g of milk, 18-60 g of corn oil and 18-60 g of xylitol. The invention has the beneficial effects that the formula is scientific, balanced in nutrition and appropriate in proportion, and the raw materials are all medicinal and edible materials with the efficacy of nourishing the spleen and the stomach, so that the efficacy of nourishing the spleen and the stomach is good. The composition is prepared into a pastry form, so that an excellent sensory evaluation result can be obtained without any food additive, and the pastry is complete in form, uniform in color, excellent in taste, soft, fine and smooth, does not stick to teeth, has fragrance, and is clear in tissue structure and free of impurities; the pastries prepared from the composition have satiety, and are suitable for long-term taking and capable of nourishing spleen and stomach.

This invention discloses a vortex-ring circulating air supply device and method for ventilation of agricultural crop storage, relating to the field of ventilation equipment technology. It includes a housing and a fan assembled within the housing. Pairs of vortex-ring duct assemblies are spaced apart along the Y-axis on the housing. A circulating wind-blocking assembly is disposed within the housing. The circulating wind-blocking assembly includes a cut-off component, a cut-off drive module, and a clutch drive module. The cut-off drive module can drive the cut-off component to move along the Y-axis, and the clutch drive module can drive the cut-off component to engage or disengage from the cut-off drive module. The vortex-ring circulating air supply device and method for ventilation of agricultural crop storage provided by this invention allow the paired vortex-ring duct assemblies to be alternately blocked under the action of the vortex-ring duct assemblies, and the blocking state can be maintained for a preset time. This allows the airflow within the vortex-ring duct assemblies to be rectified to form a complete vortex ring, achieving efficient air supply to a specific area.

The utility model relates to the technical field of bamboo shoot strip cutting, in particular to cutting equipment for small-diameter bamboo shoot strips, which comprises a cutting device and a fixing seat. The cutting device comprises a knife rest, a cutting mechanism and a guide mechanism, the knife rest is installed on the fixing base, and the cutting mechanism and the guide mechanism are oppositely arranged on the two sides of the horizontal plane where the knife rest is located and used for cutting bamboo shoot strips. The bamboo shoot strip cutting device can effectively reduce labor intensity, improve working efficiency and further guarantee the quality of cut finished products of bamboo shoot strips.

The present invention discloses a fiber bundle molding system and method with micropores, including a yarn storage rack, a coating device, a hole-forming device, and a winding device. The yarn storage rack, the coating device, the hole-forming device, and the winding device are sequentially arranged on the fiber bundle molding path. The yarn storage rack includes a yarn storage disk. The coating device can coat resin or film-like material on the surface of the fiber bundle. The hole-forming device includes a multi-degree-of-freedom head and a hole-forming bottom plate. The multi-degree-of-freedom head includes a plurality of hole-forming needles, a needle plate seat, and a needle stripping plate. The molding system of the present invention has the function of preparing micropores of various shapes and sizes. It is based on widening the fiber bundle. The formed micropores have good effect, the morphology remains intact, the spacing is adjustable and controllable, the fiber continuity is good, and the damage to the fiber is reduced. It can be used for rapid molding of high-performance fiber preforms.

The application discloses a method for separating and purifying waxberry protoplasts. The method mainly comprises the following steps: culturing and obtaining sterile seedlings or cluster seedlings of the waxberry, and selecting tender new leaves at the top of the second to third leaves; cutting the leaves into strips and then placing the leaves in a permeation liquid for pretreatment; then placing the leaves in an enzymolysis liquid containing cellulase R-10, dissociation enzyme R-10 and pectinase Y-23, and performing enzymolysis under constant temperature, darkness and shaking conditions; and finally filtering through a cell sieve, centrifuging and resuspending to obtain the waxberry protoplasts. The yield of the protoplasts obtained by using the method is as high as 3.56x10 6 The application realizes efficient separation and purification of the waxberry protoplasts for the first time, and provides a key technical basis for molecular breeding and genetic improvement of the waxberry.

The invention discloses a preparation method of Chinese prickly ash essential oil microcapsule chewable tablets with a blood fat reducing effect, and belongs to the field of functional foods. According to the microcapsule, Chinese prickly ash essential oil extracted by supercritical CO2 is used as a core material, chitosan-sodium alginate complex coacervation is used as a wall material, calcium chloride is used as a cross-linking agent, the Chinese prickly ash essential oil microcapsule is prepared by adopting an extrusion method more suitable for the oil-soluble core material, the property of the microcapsule is stable, functional components of the Chinese prickly ash essential oil can be effectively reserved, and the embedding rate reaches 96.5%. The zanthoxylum bungeanum essential oil microcapsule chewable tablet with the blood fat reducing effect is prepared from the following raw material components in percentage by mass: 4-12% of zanthoxylum bungeanum essential oil microcapsules, 25-45% of skimmed milk powder, 25-45% of a filling agent and 10-26% of erythritol. And the method has high functional food application value.

This application relates to the field of thermochromic materials technology, and particularly to a double-shell thermochromic reversible microcapsule, its preparation method, and its application. The double-shell thermochromic reversible microcapsule provided in this application includes a shell material and a core material. The shell material, from the inside out, consists of a cured epoxy resin and polymethyl methacrylate (PMMA), which are bonded together by a silane coupling agent. By weight, the core material includes 2-10 parts of a leucochromic agent, 6-16 parts of a chromogenic agent, 25-40 parts of a phase change material, and 1-2 parts of an antioxidant. The microcapsules prepared in this application have an enthalpy value of up to 190 KJ / KG and can withstand at least 200 thermal cycling experiments with an enthalpy decay of less than 5%.

The invention discloses vegetable oil gel replacing lard oil and a preparation method of Suzhou-style moon cakes. The preparation method comprises the following steps: firstly, preparing oleogels: selecting whey protein, oat beta-glucan and corn oil / peanut oil / palm oil as raw materials, and preparing three soft solid oleogels by adopting an emulsion template method; secondly, preparing the Suzhou-style moon cake: respectively stirring the wrapper and the bakery shortening by using a dough mixer, wrapping the bakery shortening into the wrapper according to a proportion, wrapping, folding and rolling the wrapper to obtain the moon cake wrapper; and wrapping the stuffing into the mooncake skin, and baking to obtain the Suzhou-style mooncake. According to the invention, whey protein and oat beta-glucan are adopted as a composite gel for the first time to prepare a novel formula of oil gel, compared with a common lard substitute, the oil gel has physical properties similar to those of solid fat, and the characteristics of protein and polysaccharide are combined through an emulsification technology, so that the content of trans-fatty acids ingested by a human body is reduced; reference is provided for green food research, and the method has important significance in promoting development of healthy fat substitutes.

The invention belongs to the field of food processing, and particularly relates to sea cucumber fresh-keeping liquid as well as a preparation method and application thereof. The fresh-keeping liquid is prepared from a grape seed extract, a spearmint extract and epsilon-polylysine hydrochloride. The compound fresh-keeping liquid is adopted, so that the taste of the instant sea cucumber is improved, the phenomenon of quality deterioration of the instant sea cucumber is improved, and the storage stability of the instant sea cucumber is enhanced.

The invention relates to a solid polymer electrolyte, a preparation method and a sodium ion battery, the solid polymer electrolyte comprises a polymer matrix, sodium difluoro (oxalato) borate and carbonic ester, and the mass volume ratio of the polymer matrix to the sodium difluoro (oxalato) borate to the carbonic ester is 1g: (0.1-0.5) g: (0.5-2) ml. The solid polymer electrolyte disclosed by the invention is high in ionic conductivity, can show excellent cycling stability when being used for the sodium solid-state battery, and particularly has excellent cycling stability under a high-rate condition, and the capacity retention rate of the prepared sodium solid-state battery can reach 72.1% after the sodium solid-state battery is stably circulated for 6000 circles under the rate of 3C.

The application discloses a tretinoin-matrine ionic liquid photocured hydrogel microneedle patch and a preparation method and application thereof, relates to the technical field of medical materials.The microneedle patch of the application takes methacrylated hyaluronic acid (HAMA) and polyether F127 diacrylate (F127DA) as a mixed matrix, and encapsulates tretinoin-matrine ionic liquid (RA-Mat IL) as an active ingredient; the preparation process comprises the following steps: ionic liquid preparation, needle tip layer and backing layer solution preparation, mold filling and drying, integrated photocuring and demolding, and the like.The microneedle patch can be directly attached to the skin surface, can effectively treat mild to moderate psoriasis and repair damaged skin barrier, and has a good application prospect in the fields of inflammatory skin disease treatment and wound repair.

The utility model provides an air pipe fixing self-tapping screw tip protective cap and an air pipe connecting structure, the protective cap is used for being installed at the self-tapping screw tip for protection, and the protective cap comprises a nut, a cap body and a sealing ring; the nut and the cover body are integrally connected, one end of the nut is sealed by the cover body, the other end of the nut is an open end with an internal thread, and the internal thread is used for being in threaded connection with an external thread of a self-tapping screw; a sealing groove is formed in the opening end face of the nut, the sealing ring is embedded in the sealing groove, and the sealing ring protrudes out of the opening end face of the nut so as to extrude the sealing ring to achieve sealing of the opening end of the nut when the nut is connected to the tip end of the self-tapping screw in a threaded mode. The protective cap for the tip of the air pipe fixing self-tapping screw has the advantages of being firm in structure, good in sealing performance, convenient to install, long in service life and good in safety.