83 results about "Nitrocellulose" patented technology

A rapid dual test kit (1) for DHA and EPA detection and method of preparation thereof; that detects DHA and EPA within 0-20 minutes, preferably 1 min; comprising of-a test device (2), a test diluent (29), a dropper (32), a pack insert (33) and a silica gel (34), an immuno-chromatographic strip (3) further comprising of a sample release pad (5), a conjugate pad (6), a nitrocellulose membrane (7), and an absorbent pad (8) arranged in a sequential overlapping manner over a backing material (4); encased in a test device (2) consisting of three open areas namely a sample port (11), test line viewing area (30), and control line viewing area (31); allowing lateral flow of sample (29) from sample release pad (5) to absorbent pad (8) via capillary action; and the method of preparation of kit is disclosed.

This utility model discloses a concentration device for the production of nitrocellulose, including a tank and an annular frame. An annular groove is formed on the inner wall of the annular frame, and a cross is rotatably connected to the inner side of the annular groove. A barrier frame is fixedly connected to the bottom of the cross, and a barrier net is fixedly connected between adjacent support members of the barrier frame. Two opposing lifting grooves are formed on the inner wall of the tank. Slider blocks are fixedly connected to the outer surfaces of both sides of the annular groove, and the two sliders are located inside the two lifting grooves and slidably connected to them. This utility model uses the barrier frame and barrier net to separate the material, thereby preventing the material from being carried out during liquid extraction, which could lead to blockage and material reduction, thus improving concentration efficiency.

This invention discloses a quantitative test strip for HBV PreS1 antibody based on the AIE molecule, its preparation method, and its applications, relating to the fields of molecular biology, immunology, and biodetection technology. The test strip includes a sample pad, a labeling pad, a nitrocellulose membrane (NC membrane), an absorbent pad, and a base plate. The NC membrane detection line is coated with HBV PreS1 antigen to capture PreS1 antibodies in the sample. The labeling pad contains an immobilized Anti-Human IgG antibody conjugated to the AIE molecule, which binds to the PreS1 antibodies in the sample to form an immune complex. The test strip of this invention enables rapid detection of PreS1 antibodies and achieves enhanced fluorescence in the detection results. Combined with a fluorescence reader or fluorescence card reader, the detection results can be digitally and quantitatively analyzed. It is simple to operate, rapid in detection, and significantly improves detection sensitivity and enables quantitative analysis.

This invention relates to the field of biodetection technology, and more particularly to a fluorescent test strip for detecting canine parvovirus, along with hybridoma cells, monoclonal antibodies, and their applications. The test strip of this invention has fluorescent microspheres coated with canine parvovirus monoclonal antibody and fluorescently labeled rabbit IgG within the conjugate pad; a detection line and a control line are disposed on the surface of a nitrocellulose membrane, with the detection line coated with canine parvovirus monoclonal antibody and the control line coated with rabbit anti-IgG; wherein the canine parvovirus monoclonal antibody is secreted using hybridoma cells with accession number C202355. The test strip of this invention can be used to simultaneously detect feline parvovirus, canine parvovirus, and various genotypes of canine parvovirus, exhibiting high sensitivity and specificity, and possessing the technical advantages of accuracy, speed, and simplicity.

The present application relates to the technical field of light polyurethane varnish, especially to the field of IPC C09D175 / 175, more particularly to a clear finish for home products, a preparation method and application thereof. The components include: A component and B component, the weight ratio between the A component and the B component is 1:(0.3-0.6); the A component, by weight percentage, the raw materials include: 50-70% alkyd resin, 1-15% nitrocellulose, 1-5% polyamide wax, 1-5% additives, 3-8% matting powder, and the first solvent makes up the balance; the B component, by weight percentage, the raw materials include: 50-90% TDI curing agent, 0.1-2% dehydrating agent, and the second solvent makes up the balance. The short oil alkyd resin is used in combination with 3106-B-70 and 33089 from Changxing Chemical Industry, which can effectively solve the problem of large difference between positive and negative gloss in the actual production process.

The invention discloses a micro gas generator homogeneous mixed medicament for a safety belt and a preparation method of the micro gas generator homogeneous mixed medicament, the micro gas generator homogeneous mixed medicament is prepared from the following components in percentage by mass: 90-97% of green gas generating medicament particles and 3-10% of nitrocellulose medicament particles uniformly dispersed in gaps of the green gas generating medicament particles, and the sum of the mass percentages of the components is 100%. By utilizing the advantages of high combustion speed and low ignition threshold of the nitrocellulose agent, the ignition delay and the combustion period of the mixed agent are shortened, the exposure time of the safety belt elbow in a high-temperature environment is shortened, the structural strength of the safety belt elbow is ensured, the problem of elbow explosion in a bonfire test is finally solved, and meanwhile, the environment-friendly characteristic of a green gas-producing agent is reserved; in addition, through the two-time charging process of the automatic production line, the mixed charging efficiency is high, and the product consistency is good.

The utility model discloses a detection kit for rapidly detecting chicken, duck and pork mixed in beef and mutton. The detection kit comprises a detection card and a plastic card, the detection card is formed by sequentially lining absorbent paper and a sample pad below a nitrocellulose membrane, cutting the nitrocellulose membrane into test strips, and packaging the test strips in the plastic card; due to the fact that specific species antibodies of chickens, ducks and pigs are preset in the detection kit, chicken, duck or pork components which are as low as 3% and mixed in milligram-level samples can be sensitively detected at a time through antigen-antibody reaction.

The invention relates to the technical field of non-invasive glycosylated hemoglobin detection, and discloses non-invasive glycosylated hemoglobin detection test paper and method.The non-invasive glycosylated hemoglobin detection test paper comprises a sampling layer, a combination cushion layer is bonded to the lower surface of the sampling layer, and a nitrocellulose membrane layer is bonded to the side face, away from the sampling layer, of the combination cushion layer; a water absorption layer is adhered to one side surface, far away from the combined cushion layer, of the nitrocellulose membrane layer; a PVC bottom plate is adhered to one side surface, far away from the nitrocellulose membrane layer, of the water absorption layer; through cooperation of the structures, the pain feeling during sampling can be reduced, and the tissue fluid collecting efficiency is improved.

The invention discloses a test strip biosensor for detecting uranyl ions, the test strip biosensor comprises a reaction system and a test strip, the reaction system comprises a DNAzyme substrate chain and a DNAzyme enzyme chain; the test strip comprises a substrate, a sample pad, a coupling pad, a nitrocellulose membrane and an absorption pad, the sample pad, the coupling pad, the nitrocellulose membrane and the absorption pad are sequentially overlapped on the substrate, a gold nanoparticle-DNA probe I compound is fixed on the coupling pad, a test line and a control line are arranged on the nitrocellulose membrane, an SA-biotin-DNA probe II is fixed on the test line, and an SA-biotin-DNA probe II is fixed on the control line. And an SA-biotin-DNA probe III is fixed on the control line. Compared with the prior art, the biosensor can realize high-sensitivity and high-specificity detection of uranyl ions by integrating a DNA enzyme induced cleavage reaction and a gold nanoparticle mediated colorimetric detection technology, the detection process is simple and rapid, and an important technical support is provided for field monitoring of UO2 < 2 + > in environment and biological samples.

The application belongs to the technical field of paint, and provides a solvent type spraying anti-flocculation black paste, a preparation method and application thereof.The solvent type spraying anti-flocculation black paste comprises the following components in percentage by weight: aldehyde ketone resin, 5-10%; nitrocellulose, 5-15%; dispersing agent, 1-4%; modified carbon black powder, 5-10%; anti-sedimentation agent, 0.5-2%; mixed solvent, 65-80%.The solvent type spraying anti-flocculation black paste has excellent anti-sedimentation effect, good storage stability, can reduce color floating and flocculation in the spraying construction process, has excellent spraying anti-flocculation effect, and can greatly improve the spraying construction performance.

The application discloses a nitrocellulose feeding process, which comprises the following steps: adding a solvent, pouring the solvent into a stirring kettle; adding an additive, after the solvent is added, the additive is poured into the stirring kettle; feeding nitrocellulose, after the additive is added, the nitrocellulose is gradually fed into the stirring kettle according to the feeding sequence from low to high viscosity, so that the nitrocellulose is soaked in the solvent; pressing the nitrocellulose, the nitrocellulose is pressed downward by using a cotton pressing rod, so that the nitrocellulose is immersed in the solvent; and fully soaking, after the nitrocellulose is pressed, the nitrocellulose is statically soaked in the stirring kettle for more than 30 minutes. The feeding process of the nitrocellulose is optimized, the solvent is first poured into the stirring kettle instead of feeding the nitrocellulose first and then pouring the solvent, the cotton feeding process is slowed down, the nitrocellulose is sequentially fed according to the characteristics of the nitrocellulose, and the step of pressing the nitrocellulose is further added; after the nitrocellulose is completely immersed in the solvent, the method can reduce the risk of nitrocellulose production to the maximum extent and improve the safety of production.

The utility model relates to the technical field of nitrocellulose membrane processing, and discloses nitrocellulose membrane production equipment which comprises a kettle body, a supporting seat arranged on the outer surface of the kettle body, a placing seat arranged on the upper surface of a kettle cover, a driving motor arranged on the upper surface of the placing seat, and a rotating shaft arranged at the output end of the driving motor through a coupler, one end of the rotating shaft penetrates through the kettle cover and extends into the kettle body, stirring blades are mounted on the outer surface of the rotating shaft, a plurality of mounting grooves are formed in the inner wall of the kettle body, baffles are arranged in the mounting grooves, a groove is formed between every two adjacent mounting grooves, and a connecting assembly is arranged in each groove. According to the utility model, a welding fixing mode in the prior art is replaced by the arranged connecting assembly, so that the baffle plate with plastic deformation can be conveniently and quickly replaced, the risk of fatigue failure of a welding seam caused by alternating stress is avoided, the physical damage of cutting replacement to the kettle body structure is eliminated, and a better practical effect is achieved.

The utility model relates to the technical field of recovery devices, and discloses a nitrocotton separation and recovery device which comprises a bottom plate, supporting rods are fixedly mounted at four corners of the lower surface of the bottom plate, and a baffle is arranged in the middle of the lower surface of the bottom plate; side plates are fixedly installed on the two sides of the upper surface of the bottom plate, a flow groove is formed between the bottom plate and the side plates, and a plate opening is formed in the middle in the bottom plate. And the baffle movably penetrates through the plate opening of the bottom plate. Through the arrangement of the baffle, the two sets of through openings and the sealing sleeve, the screw can be driven by the forward and reverse motor to rotate clockwise for several circles, the screw is matched with the supporting block to drive the baffle to move upwards, the baffle moves upwards to enable the through opening in the lower side and the filter screen to intercept nitrocotton, and when too much nitrocellulose is accumulated on the filter screen to block the nitrocotton, the motor drives the screw to rotate anticlockwise for several circles, so that the nitrocotton is blocked. Compared with a filter screen dismounting and mounting mode, the mode that the two sets of through openings are used alternately does not need to stop discharging waste water, and practicability is high.

This invention relates to a method for the large-scale production of "I"-shaped test strips for hygiene products, belonging to the field of medical test strip processing. The "I"-shaped test strip is an improvement and breakthrough of conventional test strips, reducing the foreign body sensation and other discomfort caused to users when used in hygiene products without affecting the test strip's detection function. The large-scale production process includes cutting colloidal gold-nitrocellulose boards, attaching colloidal gold-nitrocellulose strips to a substrate, attaching sample pads and absorbent pads to the substrate, laminating a top waterproof membrane, and rolling the formed test strips. This process can continuously produce high-quality "I"-shaped test strip rolls, meeting the diverse production needs of the hygiene product industry.

The invention discloses a high-gloss formula of nitro gloss paint for pencils and a preparation method, and particularly relates to the field of paint gloss paint. The coating comprises the following components: 18-22 parts of nitrocellulose with a nitrogen content of 12%, 8-12 parts of organosilicon modified resin, 5-8 parts of a gloss enhancing auxiliary agent, 2-4 parts of rare earth doped functional particles, 1.5-2.5 parts of a leveling agent, 1.5-2 parts of a cross-linking agent, and 50-60 parts of a solvent. The preparation method comprises the following steps: dissolving nitrocellulose and organosilicon modified resin; adding a gloss enhancing aid and rare earth doped functional particles, and dispersing to form a rare earth ion-silica chain-resin oriented network; the rare earth doped functional particles are prepared by doping a silica network with rare earth ions Ce < 3 + > and Eu < 3 + > and introducing an amino functional group, and the glossiness, the adhesive force, the wear resistance and the stability of a paint film are remarkably improved through the oriented network.

The invention relates to the technical field of nitrocotton processing, in particular to a closed micro-pressure discharge acid preparation machine which comprises a tank body, acid inlet pipes, a breather valve, a pressure detector and a controller, an acid outlet is formed in the bottom of the tank body, at least two acid inlet pipes are arranged at the top of the tank body, one end of each acid inlet pipe extends into the tank body, and the other end of each acid inlet pipe extends into the tank body. The breather valve is installed at the top of the tank body and communicated with the tank body, the pressure detector is installed at the top of the tank body, the detection end of the pressure detector extends into the tank body, and the controller is electrically connected with the breather valve and the pressure detector. The stirring device is arranged in the closed tank body, so that the acid preparation work can be completed in a limited closed space, the safety of the surrounding environment and personnel is guaranteed, meanwhile, the breather valve and the pressure detection device are arranged at the top of the tank body, overpressure is avoided, and the later-period nitrate smoke tail gas treatment pressure and treatment cost are reduced; and the treatment pressure caused by emission of a large amount of nitrate smoke is reduced.

The utility model relates to nitrocellulose compression technical field discloses a kind of nitrocellulose cotton pressing equipment, including compression box, the front end of compression box is equipped with door by hinged rotary installation, the upper end of one side of compression box is fixedly installed with air extractor, the air extraction end of air extractor is communicated with exhaust pipe, another end of exhaust pipe is communicated with processing box.The utility model technical scheme can make driven gear drive fixed rod to rotate, rubber stick on fixed rod will follow rotation, make rubber stick constantly knock filter screen, again cooperate spring on filter screen, drive filter screen reciprocating motion, to reach the cleaning of adherend below filter screen, to guarantee the oxygen discharge effect in nitrocellulose inside, rack can also make extrusion plate move to right, so that extrusion plate carries out cotton pressing treatment to nitrocellulose in compression box, to reach the cotton pressing treatment to nitrocellulose while cleaning filter screen, to facilitate subsequent cotton pressing operation of nitrocellulose.

The ferromagnetic substance collecting device comprises an aluminum foil box with an opening in the upper end, a stirrer is arranged over the aluminum foil box, and a stirring head of the stirrer can stretch into the aluminum foil box; one side, close to the bottom end, of the aluminum foil box is connected with the nitrocellulose recovery device through a liquid conveying pipeline a, and the other side of the aluminum foil box is connected with the solvent recovery device through a liquid conveying pipeline b. The method comprises the following steps: putting nitrocellulose into an aluminum foil box, adding water, stirring to separate out and dissolve ferromagnetic substances in the nitrocellulose into the water, adsorbing the ferromagnetic substances at the bottom of the aluminum foil box through the attraction of a magnet, collecting the ferromagnetic substances at the bottom, washing and drying to obtain the content of the ferromagnetic substances in the nitrocellulose. The device is simple in structure, nitrocellulose is evenly dispersed through stirring, ferromagnetic substances are adsorbed from the bottom through the magnet, physical separation of target impurities and a matrix (nitrocellulose) is achieved, and operation is easy.

The invention discloses a lateral flow biosensor for joint detection of SAA and CRP based on an AIE material and application, the lateral flow biosensor comprises a sample pad, a combination pad, a nitrocellulose membrane and a water absorption pad, the combination pad is coated with fluorescent nano-microsphere labeled antibodies AIE490NP-SAA, AIE490NP-RIgG and AIE610NP-CRP, and the nitrocellulose membrane is coated with fluorescent nano-microsphere labeled antibodies AIE490NP-RIgG and AIE610NP-CRP. A detection line T line and a quality control line C line are sprayed on the nitrocellulose membrane, the T line is formed by an SAA coating antigen and a CRP coating antigen which are coated on the nitrocellulose membrane, and the C line is formed by a goat anti-rabbit IgG antibody coated on the nitrocellulose membrane. The prepared lateral flow biosensor can simultaneously detect CRP and SAA, has high sensitivity and good repeatability, and has wide application prospects in differential diagnosis of early infectious diseases.

The invention relates to a porous arylamine polymer stabilizer (POP-EDA) suitable for nitrocotton, which is prepared from a node unit 1, 3, 5-tribromobenzene and a connecting unit ethylenediamine. As chain fatty amine, ethylenediamine not only can introduce NOX absorption active sites, but also can construct a non-conjugated spatial network arylamine polymer structure. Compared with a conventional stabilizing agent, the polymer has high thermal stability and a relatively high specific surface area, not only has efficient physical adsorption capacity on nitrogen oxides generated by decomposition of nitrocotton, but also can stably and chemically fix the nitrogen oxides, so that autocatalytic decomposition of the nitrocotton is inhibited, and the service life of the nitrocotton can be effectively prolonged. The problems of poor thermal stability, few reaction active sites, generation of by-product gas, poor stabilizing effect and the like of the existing small-molecule stabilizing agent are solved, and the stability of the nitrate-based energetic material can be widely enhanced.

The application discloses a portable chromatographic detection device and application thereof, and belongs to the technical field of detection devices. The device comprises a top cover, a base, a test strip and a flexible PCB circuit board. The test strip comprises a sample pad, a binding pad, a nitrocellulose membrane, a water absorption pad and a supporting back plate. The nitrocellulose membrane has a patterned electrode as an electric channel, and is divided into a clamping area and a detection area for solution flow. The clamping area is connected with the flexible PCB circuit board through a magnetic attraction connector. One end of the detection area is connected with the water absorption pad in a top-overlapping manner, the other end of the detection area is connected with the binding pad in a top-overlapping manner, and the other end of the binding pad is connected with the sample pad in a top-overlapping manner. Hollow windows are formed in the top cover at the sample pad and the nitrocellulose membrane. The detection device is convenient to carry, has various functions, is high in sensitivity and integration, can be used in combination with computers, mobile phones and other equipment, and is particularly suitable for use in families, fields and other places.

The invention relates to the technical field of biological detection, and particularly discloses a preparation method and application of a Brucella antibody immunochromatography detection test strip based on colloidal carbon. The Brucella antibody immunochromatography detection test strip provided by the invention comprises a PVC (Polyvinyl Chloride) bottom plate, a sample pad, a combination pad, a nitrocellulose membrane and a water absorption pad are arranged on the PVC bottom plate; the binding pad contains lipopolysaccharide of colloidal carbon labeled brucella, the nitrocellulose membrane is provided with brucella lipopolysaccharide and a goat anti-mouse igG antibody which are respectively used as a detection line (T) and a quality control line (C), and the colloidal carbon technology-based immunochromatography test paper is established by detecting different specimens and comparing with other detection methods. The test strip prepared by the invention has the advantages of no subjective influence of a detector, simplicity and convenience in operation, high detection sensitivity, strong specificity and the like.

The utility model relates to nitrocellulose microporous membrane chromatography rate test technical field discloses a kind of multi-channel nitrocellulose microporous membrane lateral chromatography rate test device, comprising: base, with overflow groove and multiple liquid storage tanks, each liquid storage tank is located in the side of overflow groove;Liquid baffle, liquid baffle is between base and each liquid storage tank;Anti -skid component, installation is in base, anti -skid component has multiple groups, multiple anti -skid components one to one corresponding in multiple liquid storage tanks;Object table, detachably installed in base, object table is located in each liquid storage tank, object table has slope, slope is used to carry multiple samples, so that the bottom of each sample extends into each liquid storage tank and is abutted on each anti -skid component;And water absorption plate, including water absorption part and extension, water absorption part is located in the top of liquid baffle, extension is located in overflow groove.The utility model's test device, realize multi-channel test, improve test efficiency, and guarantee the consistency and accuracy of test.

This invention discloses a biosensor for detecting uranyl ions using a test strip, comprising a reaction system and a test strip. The reaction system includes a DNAzyme substrate chain and a DNAzyme enzyme chain. The test strip includes a substrate and a sample pad, a coupling pad, a nitrocellulose membrane, and an absorbent pad sequentially overlapped on the substrate. A gold nanoparticle-DNA probe I complex is immobilized on the coupling pad. A test line and a control line are provided on the nitrocellulose membrane. An SA-biotin-DNA probe II is immobilized on the test line, and an SA-biotin-DNA probe III is immobilized on the control line. Compared with existing technologies, this biosensor integrates a DNase-induced cleavage reaction with gold nanoparticle-mediated colorimetric detection technology, achieving high sensitivity and high specificity detection of uranyl ions. Furthermore, the detection process is simple and rapid, providing a solution for detecting UO2 in environmental and biological samples. 2+ This provides important technical support for on-site monitoring.

The application relates to the technical field of cosmetic detection, and particularly discloses a test paper card for detecting boric acid and / or borate in cosmetics and a detection method. The test paper card for detecting boric acid and / or borate in cosmetics comprises an activated sample pad, a functional reaction film and a PVC bottom plate which are sequentially attached, the activated sample pad is a glass fiber membrane soaked by a pretreatment reagent, the functional reaction film is a nitrocellulose membrane coated by a chromogenic reagent, the functional reaction film comprises an attaching area and a chromogenic area, the activated sample pad is located in the attaching area, and the chromogenic area is exposed to the environment. The application can be used for detecting whether boric acid and / or borate is contained in cosmetics, and can improve the sensitivity and stability of the detection of boric acid and / or borate in cosmetics.

The invention belongs to the technical field of virus detection, and particularly relates to a porcine delta coronavirus N protein monoclonal antibody and a latex immunochromatography test strip containing the antibody. According to the invention, a prokaryotically expressed PDCoV N protein is used as an immunogen to immunize a mouse, and a specific monoclonal antibody 2G3 and a specific monoclonal antibody 9C4 are screened through cell fusion and a subcloning technology. The test strip comprises a PVC (polyvinyl chloride) bottom plate, a sample pad, a combination pad, a nitrocellulose membrane (NC membrane) and a water absorption pad, a quality control line C and a detection line T are respectively arranged on the NC membrane. The test strip can specifically recognize PDCoV, the lowest detection limit can reach 103.0 TCID50 / mL, the test strip has no cross reaction with other clinical common diarrhea viruses, the result interpretation only needs 15 min, and the test strip has the advantages of being rapid, sensitive, easy and convenient to operate and the like.

The invention provides an avibactam / ceftazidime blood concentration rapid joint detection test strip and a preparation method, system and application thereof. The system comprises an immunochromatography test strip and a time-resolved fluorescence detection system. The immunochromatography test strip comprises a sample pad, a combination pad, a nitrocellulose membrane detection area and an absorption pad; the sample pad is made of glass fibers treated by cane sugar or a surfactant; the combination pad is loaded with a time-resolved fluorescent microsphere coupled monoclonal antibody probe; an avibactam detection line T1, a ceftazidime detection line T2 and a quality control line C are arranged in the nitrocellulose membrane detection area according to the flowing direction; the absorption pad is made of cellulose materials. Compared with the prior art, rapid combined detection of the avibactam / ceftazidime blood concentration can be realized within 15 minutes, and the method has the advantages of high sensitivity, wide linear range, strong anti-interference capability and simplicity and convenience in operation, and can meet the bedside rapid detection requirement.

The invention belongs to the technical field of biological detection, and discloses an allergen-specific IgE antibody detection card, a kit and application. The allergen specificity IgE antibody detection card comprises a combination pad and a nitrocellulose membrane, wherein the combination pad is coated with a mouse anti-human IgE antibody marked by AIE polystyrene fluorescent microspheres and a rabbit IgG antibody marked by AIE polystyrene fluorescent microspheres; a detection line of the nitrocellulose membrane is coated with a specific antigen, and a quality control line of the nitrocellulose membrane is coated with a goat anti-rabbit IgG antibody. The kit prepared from the reagent card is used for detecting the allergen-specific IgE antibody, has the characteristics of high detection sensitivity, high specificity, simplicity in operation, cost saving and the like, and has a very large market and a good application prospect.

The present application relates to a kind of solid deflagration expansion fixed type ultrasonic wave drilling anchoring device and method, belong to ultrasonic wave drilling anchoring technical field.Solve the problem of insufficient anchoring force.It includes feeding device and drilling anchoring device, the feeding device is established with drilling anchoring device cooperation, feeding device is used to drive drilling anchoring device, drilling anchoring device is used to realize fixed.The present application when reaching certain drilling depth, solid fuel in the end of drill pipe cavity is ignited by electrode, ignites solid fuel nitrocellulose, occurs violent combustion and explosion, produces a large amount of energy, and the end of drill pipe is extruded and deformed;Deformed expansion cavity will extrude the inner wall of borehole, produce certain expansion force, provide larger effective anchoring force for the whole device, realize the fixation of the whole device, provide larger anchoring force for sampler under simple structure.