472 results about "Needle penetration" patented technology

A preform tooling arrangement includes a base plate comprising a male die surface and a stripper plate comprising a female die surface. A plurality of perforations are disposed in the base plate and / or the stripper plate. The stripper plate is moveable with respect to the base plate. The preform tooling arrangement is configured to receive a fibrous preform between the male die surface and the female die surface. The preform tooling arrangement is a dual-purpose fixture configured to accommodate z-needling and densification, all while the fibrous preform remains in the same fixture (i.e., the preform tooling arrangement). The perforations are configured to receive one or more textile needles for through thickness reinforcement of the fibrous preform.

The invention provides a leakage-proof load-bearing non-woven fabric hand bag and a manufacturing process, and relates to the technical field of non-woven fabric hand bag manufacturing. A multi-layer composite structure design is constructed, and a layered non-woven fabric hand bag manufacturing technology based on outer layer protection, middle functions and inner layer load bearing is provided; on this basis, the process steps of vacuum adsorption permeation, differential cooling and the like of the high-porosity PET needle-punched non-woven fabric and the overheat melting PLA material are introduced, and the needle-punched density, the PLA melting temperature, the vacuum degree, secondary heating and the cooling rate of the bent position / non-bent position are strictly controlled, so that PLA is fully permeated in PET fiber pores, and the local rigidity is directionally enhanced; the comprehensive performance of the leakproof load-bearing non-woven fabric hand bag and the manufacturing process hand bag is obviously improved.

The invention discloses a component global homogenized C / C-UHTCs composite material and a preparation method thereof.The preparation method comprises the steps that non-woven cloth is laid, then needling is conducted in the Z direction to obtain a carbon fiber preform, chemical vapor deposition is conducted on the carbon fiber preform to obtain a C / C composite material, molten salt infiltration treatment is conducted on the C / C composite material, a C / C-UHTCs porous body containing a UHTCs interface layer is obtained, and the C / C-UHTCs porous body containing the UHTCs interface layer is obtained; carrying out reactive infiltration treatment on the C / C-UHTCs porous body by adopting silicon-containing alloy powder to obtain a C / C-UHTCs composite material; the C / C-UHTCs composite material prepared by the preparation method provided by the invention has the advantages of extremely high density, extremely low porosity, no fiber damage, intact interface and uniformization of components, the mass ablation rate is a negative value after the C / C-UHTCs composite material is ablated by oxyacetylene flame at 2600 DEG C for 180s, and the C / C-UHTCs composite material has extremely excellent ablation resistance.

The invention provides a right-angle needling mechanism and needling equipment, and belongs to the technical field of carbon fiber product production equipment. Comprising a first right-angle needling assembly, a second needling assembly, a position adjusting assembly and an angle adjusting assembly, wherein the position adjusting assembly drives the first right-angle needling assembly and the second needling assembly to be close to or away from a prefabricated body; the angle adjusting assembly changes the needling angles of the first right-angle needling assembly and the second needling assembly; the angle adjusting assembly, the first right-angle needling assembly and the second needling assembly are located on the adjusting assembly, the first right-angle needling assembly comprises a first right-angle needle plate, and the second right-angle needling assembly comprises a second right-angle needle plate. And the first right-angle needle plate and the second right-angle needle plate are respectively used for needling one side of the right-angle part of the prefabricated body. According to the technical scheme, effective needling operation can be conducted on square prefabricated bodies with angles, especially right-angle parts of the prefabricated bodies.

The invention discloses a preparation method of composite geotechnical cloth, belongs to the technical field of geotechnical material processing, and solves the problems of insufficient interlayer bonding strength, poor permeation stability and incapability of adapting to regional differentiation mechanical requirements in the traditional process. According to the method, two layers of synthetic fiber geotextile and a layer of polymer geomembrane are selected, and a gradient needling machine is adopted to implement a double-station gradient needling process, specifically, thick needle needling pre-reinforcement is synchronously conducted on the upper side and the lower side till the membrane thickness is 50-60% of the depth, then fine needle needling finishing is conducted till the membrane thickness is 70-80% of the depth, the needling density is preset to be 20-70 needles / cm according to different stress areas of a membrane material, and the needling density is 20-70 needles / cm according to different stress areas of the membrane material; in the process, data of needling depth, needling density and membrane material tension are collected in real time through a dynamic monitoring system, parameters are automatically adjusted, and finally a stable structure is formed through heat setting treatment at 120-140 DEG C for 8-12 minutes. The composite geotextile prepared by the method has a high-strength bonding interface and excellent anti-seepage performance, and is suitable for the engineering fields of water conservancy project anti-seepage, road base reinforcement, refuse landfill isolation and the like.

The invention discloses a high-temperature-resistant thermal protection coating reinforced composite material and a preparation method thereof, belongs to the field of light thermal insulation materials, and solves the problems that high-temperature sintering is needed in the preparation process of an existing thermal protection coating, and the coating effect is affected. The method comprises the following steps: mixing a functional material, a reinforcing agent and a sintering aid, ball-milling, and sieving to obtain a filler; adding the binding agent into the dispersing agent and stirring; adding the filler into the dispersing agent solution, and performing ultrasonic treatment and stirring to obtain a mixture; spraying the mixture onto a fiber web tire, and curing; a fiber web tire loaded with the thermal protection coating is obtained; laying the fiber web tire on the surface of the fiber felt, and combining the fiber web tire and the fiber felt through a needling process to obtain a fiber preform; placing the fiber preform in a mold, pouring resin into the mold, and sealing the mold; and carrying out sol-gel and normal-pressure drying to prepare the high-temperature-resistant thermal protection coating reinforced composite material. The prepared composite material is low in density, low in heat conductivity and excellent in ablation resistance.

The invention discloses an automatic measuring device for yield stress of a 3D printing material, and the device comprises a pedestal which is provided with a rotary test bench, and the rotary test bench is provided with a to-be-tested object placement cavity with an opening in the top; the column rod is arranged on the base; the cross beam is arranged at one end of the post away from the base; one end of the needle penetration testing mechanism is connected to the cross beam and located above the to-be-tested object placing cavity, and the other end of the needle penetration testing mechanism is placed in the to-be-tested object placing cavity during measurement and used for performing needle penetration testing on a material in the to-be-tested object placing cavity; the lifting mechanism is arranged on the cross beam, the side edge of the lifting mechanism is connected with the needle penetration testing mechanism, and the position of the needle penetration testing mechanism is adjusted through the lifting mechanism; the controller is electrically connected with the rotary test board and the needle penetration test mechanism; the controller is electrically connected with the lifting mechanism and the rotary test board, so that the descending height of the lifting mechanism and the rotating angle of the rotary test board are controlled through a computer, and intelligent and accurate control over the device is achieved.

The invention relates to the technical field of absorption cores, in particular to an absorption core and a preparation method and application thereof. The invention discloses an absorption core body. The absorption core body comprises a plurality of upper layers and lower layers, wherein the upper layers are sequentially attached together from top to bottom, and the lower layers are attached to the lower portions of the upper layers. The upper layer is a wood pulp layer made of 100% fluff pulp or the upper layer is needle-punched cloth; and the lower layer is spunlace cloth or dust-free paper. The absorption core body comprises the upper layer and the lower layer, the upper layer is fluffy and soft, and liquid can be rapidly transmitted to the lower layer; the lower layer is compact and not prone to deformation, liquid can be rapidly and transversely conducted, the liquid can be stored, reverse osmosis to the upper layer is not prone to occurring, meanwhile, larger strength can be provided for the core body, and the core body is not prone to breakage.

The utility model relates to the field of acupuncture cotton slitting, in particular to an acupuncture cotton slitting device capable of adjusting cutting size, which comprises a rack, a slitting component is arranged at the top of the rack, a boss is arranged on one side of the rack, a feeding roller is arranged at the top of the boss, a winding roller is arranged on the other side of the rack, and a cutting component is arranged on the winding roller. The slitting device comprises a rack, a slitting assembly is arranged at the top of the rack, a motor is arranged at one end of the slitting assembly, the slitting assembly comprises a transmission part and a plurality of cutter parts, and the plurality of cutter parts are uniformly arranged on the transmission part; the slitting assembly is arranged on the machine frame and divided into the transmission part and the cutter part, the cutter blades in the cutter part move left and right on the transmission roller to adjust the intervals between the cutter blades, when the intervals are adjusted to be proper, the fixing rods are twisted, the fixing rods are adopted to be attached into the fixing grooves, and then the cutter blades are cut off. And the effect of stabilizing the cutting blade is achieved.

The utility model relates to a film hole puncturing device for mushroom planting, which belongs to the technical field of mushroom planting, and comprises a support plate and a second roller, and the second roller is provided with a receiving structure; the collecting structure comprises a mounting hole formed in the second rotating roller and eight placement grooves formed in the second rotating roller, eight passing grooves communicating with the eight placement grooves are formed in the second rotating roller, the eight passing grooves communicate with the mounting hole, the second rotating roller is provided with eight sliding grooves through the eight passing grooves, and the eight sliding grooves communicate with the mounting hole. The second rotating roller is slidably connected with eight sliding blocks through the eight sliding grooves, and the eight sliding blocks are each provided with a rack plate. And by arranging a retracting structure, a second rotating block is rotated, so that needles are completely retracted into a placement groove, then a third rotating block is rotated, so that a second threaded rod extrudes a second rotating roller, the positions of the needles are fixed, the effect of retracting the needles is achieved, and the situation that the device scratches people when not in use is avoided.

The invention discloses a preparation method of a high-density carbon-carbon composite material, which comprises the following steps: soaking a needled prefabricated body in a resin mixed solution, vacuumizing and dipping, drying in a drying oven, then putting into a mold, carrying out hot-pressing curing molding, and carbonizing to obtain the high-density carbon-carbon composite material. According to the preparation method, the carbon-carbon composite material with the density larger than 1.2 g / cm < 3 > can be obtained through one-time dipping and one-time hot pressing, the production period is short, energy consumption is low, the production cost is remarkably reduced, and the carbon-ceramic composite material with the density larger than 1.2 g / cm < 3 > can be obtained through one-time dipping and one-time hot pressing. And the prepared carbon-carbon composite material can achieve a high-density effect when the density is low, and has the characteristics of good air tightness, difficulty in deformation at high temperature and the like.

The invention discloses a multifunctional rotary body prefabricated body inner wall needling device which comprises a rack, a hollow clamping rotary disc is installed at the bottom of the rack, a prefabricated body buffering supporting mold is fixed to the hollow clamping rotary disc, a needling supporting beam is installed in the prefabricated body buffering supporting mold, and a needling mechanism is movably arranged in the middle of the needling supporting beam. The two ends of the needling supporting beam penetrate out of the prefabricated body buffering supporting mold and the hollow clamping rotary disc to be connected with an X-axis moving assembly arranged on the machine frame. By means of the design, the technical problems that the outer wall needling connection density of an existing rotary body prefabricated body is lower than the inner wall needling connection density, composite material layering can be caused under the severe flight environment, and needling of a cylindrical part prefabricated body and a conical part prefabricated body cannot be completed on the same device at the same time are solved.

The invention belongs to the technical field of material detection, and relates to a modified asphalt penetration measuring device and a use method thereof.The modified asphalt penetration measuring device is characterized in that the lower side of an installation frame is connected with a first limiting rod, and the farthest distance between the center of a standard needle installed on a measuring head assembly and the lower end of the first limiting rod is larger than or equal to 10 mm; the lowest point of the first limiting rod is higher than a standard needle installed on the measuring head assembly, two opposite second limiting rods are arranged on the installation frame in a sliding mode, and the two second limiting rods are located on the two sides of the position between the second limiting rods and the standard needle on the measuring head assembly respectively. The distance between the test point of the standard needle on the asphalt and the edge of the sample container is greater than or equal to 10mm by utilizing the limiting of the limiting rod I, so that the edge effect is avoided, the test point is close to the central area of the asphalt, and the measurement precision is improved; besides, the two limiting rods II are used for centering, limiting and stabilizing the sample containing vessel, so that the distance between the test points can be ensured to be greater than or equal to 10mm only by ensuring that the angle between the adjacent standard needles is close to 120 degrees, and mutual influence is avoided.

The invention relates to the technical field of coiled materials, in particular to an asphalt waterproof coiled material and a preparation method thereof. The preparation method comprises the following steps: firstly, coating a boron nitride nanosheet with porous alkenyl organic silicon constructed by adopting phenyltrimethoxysilane, 1, 4-bis (triethoxysilyl) benzene and vinyltrimethoxysilane as a framework, adding the boron nitride nanosheet and SBS into asphalt to obtain modified asphalt, then coating the modified asphalt on the surface of a polyester base, and finally coating the modified asphalt on the surface of the polyester base. And flattening and cooling to obtain the waterproof coiled material. The porous alkenyl organosilicone-coated boron nitride nanosheets adopted in the invention significantly improve the penetration, softening point and ductility of asphalt, and improve the tensile property, heat resistance and waterproofness of the waterproof coiled material prepared from the asphalt, and the waterproof coiled material is suitable for long-term use in a complex environment.

The utility model discloses needling equipment with a mesh belt mesh feeding mechanism. The needling equipment comprises the mesh belt mesh feeding mechanism and a needling mechanism, the mesh belt mesh conveying mechanism comprises two conveying meshes which are arranged up and down at an interval, and a fiber mesh is conveyed between the two conveying meshes; the up-down conveying net is composed of a plurality of net belts which are sequentially arranged in parallel, and gaps allowing needles of the needling mechanism to penetrate through are formed between the adjacent net belts. The mesh belt mesh conveying mechanism is adopted to replace a common mesh pressing roller, a mesh stripping plate and a mesh supporting plate, the phenomenon that a fluffy fiber mesh is blocked when entering a needling area due to the fact that the fiber mesh rebounds due to the fact that gaps exist between the mesh pressing roller and the mesh stripping plate as well as between the mesh pressing roller and the mesh supporting plate can be avoided, the fiber mesh is clamped and synchronously conveyed between the upper conveying mesh and the lower conveying mesh, and the needling efficiency is improved. The efficiency of the needling equipment can be greatly improved, and the process speed limitation of the traditional needling equipment is broken through.

A method for producing a composite material part comprising —a step of producing a preform formed of unidirectional continuous fibers oriented in at least one fiber orientation, —a step of applying non-woven filaments to the preform, and —a step of needling the filaments by means of a needling device comprising a plurality of needles, each needle being provided with a notch extending along a notch axis perpendicular to the main longitudinal axis of the needle, or several notches each extending along a notch axis perpendicular to the main longitudinal axis of the needle, the notch axes being parallel to each other, the needles and the preform being arranged so that the notch axes form a non-zero angle with the fiber orientation.

The invention relates to the technical field of needling machine equipment, in particular to a needling device suitable for a special-shaped composite material preform, which comprises a mounting seat, a speed reducing motor is connected to the mounting seat, the output end of the speed reducing motor is connected with a rotating shaft, the rotating shaft is connected with an eccentric through hole of an eccentric wheel, and the eccentric wheel is rotatably connected in a cylindrical needle bearing; the cylindrical needle bearing is inserted into a second through hole in the end of the push plate, the push plate is in sliding fit with the mounting base, the other end of the push plate is connected with the quick-change needle row, the other end of the quick-change needle row faces the tool, the bottom of the mounting base is connected with the horizontal moving part, and the quick-change needle row is adjusted to face the normal direction of a prefabricated body and conducts needling on the prefabricated body. The surface of the R-angle prefabricated body and the surface of the conical prefabricated body can be needled, and then the purpose of tight combination of fibers in the prefabricated body is achieved.

The invention discloses a needling mass transfer device based on a mechanical reciprocating structure, and relates to the technical field of mass transfer, the needling mass transfer device comprises a marble base, and a mechanical needling system, a blue film moving system and a PCB moving system which are arranged on the marble base, the mechanical needling system is arranged on a portal frame, and the portal frame is fixed at the top of the marble base; the PCB moving system is fixed to the center of the marble base, and the blue film moving system is arranged above the PCB moving system in a crossing mode and located below the mechanical needling system. According to the needling mass transfer device based on the mechanical reciprocating structure, the mechanical structure is used for driving the mechanical structure to conduct vertical needling through the rotating motor, and chips evenly distributed on a blue film are flexibly needled to a target welding spot; and non-direct motor driving, flexible contact and theoretically no transfer speed upper limit Mini LED chip mass transfer can be realized.

The utility model belongs to the technical field of batteries, and particularly relates to a positive plate, a battery and electric equipment, the positive plate comprises a positive current collector and an active material layer, the positive current collector is provided with a protection structure, the protection structure is arranged between the positive current collector and the active material layer, and the active material layer is arranged between the positive current collector and the active material layer. The protection structure comprises a ceramic layer and a gel layer, and the ceramic layer, the gel layer and the active material layer are sequentially arranged on the surface of the positive current collector in the thickness direction of the positive current collector; the ceramic layer and the gel layer can effectively form a dual-protection structure on the surface of the positive current collector, and when the battery is subjected to a needling test, the negative active material firstly contacts with the active material layer, then respectively contacts with the gel layer and the ceramic layer, and finally reaches the surface of the positive current collector, so that the negative active material can be effectively protected. Therefore, the contact area of the negative electrode active material and the positive electrode current collector is effectively reduced, the needling test passing rate of the battery is further improved, and the safety performance of the battery is improved.

The invention provides a castable setting time measuring device, which comprises a sample barrel, a test needle and a vertical reciprocating motion part, and also comprises a test needle penetration point displacement assembly, and the test needle penetration point displacement assembly comprises a sample barrel rotation driving part used for driving the sample barrel to rotate so as to change the penetration position of the test needle through the rotation of the sample barrel; the test needle horizontal moving part is arranged at the top of the sample barrel, and is connected with the test needle through the vertical reciprocating moving part, so that the test needle can be driven by the vertical reciprocating moving part to penetrate into a next penetration point again after the test needle moves by a fixed distance on the test needle horizontal moving part; the sample barrel rotation driving part, the test needle horizontal moving part and the vertical reciprocating moving part are all connected with a PLC (Programmable Logic Controller); the PLC is used for controlling the sample barrel rotation driving part, the test needle horizontal moving part and the vertical reciprocating moving part to act, so that the penetration position of the test needle corresponds to the penetration point position on a set penetration track. According to the invention, the accuracy of test results is improved.

The invention provides a needling method cement blanket and a processing technology thereof, and relates to the technical field of cement blankets, the needling method cement blanket comprises a top fabric layer, function complementation is achieved through a three-layer composite structure of the top fabric layer, a curable layer and a bottom fabric layer, a top polyester non-woven fabric has filtering and protecting effects, particles of the curable layer can be prevented from seeping out, and the effect of preventing the particles from seeping out is achieved. The high-strength polypropylene fiber woven fabric at the bottom layer provides stable support, so that the shape stability in construction and use is guaranteed; the integrated connection characteristic is prominent, all the layers are tightly combined through the needling technology, the layering problem is avoided, and the overall reliability is improved. The real-time monitoring module arranged on the needling machine can dynamically capture the thickness change of the curable layer, the response time is shortened to be within 0.5 second, and the thickness deviation can be found in time; deviation correction is automatic, when the thickness exceeds the threshold value of + / -0.5 mm, the spreading speed is automatically adjusted, manual intervention is not needed, the thickness out-of-tolerance rate is reduced to 1% or below from 15% or above of a traditional technology, and the problem of uneven thickness is thoroughly solved.

The invention belongs to the technical field of material processing engineering, and relates to a resistance welding method for a thermoplastic composite material and an implementation device. According to the method, an implantation layer is clamped between two to-be-welded parts, pricking needles of a pricking electrode array are used for pricking the implantation layer from top to bottom and are electrified after making contact with a conductive core layer, and resistance welding is achieved; the acupuncture electrode array adopts a special arrangement mode, so that the current can be uniformly distributed, and the stable introduction and connection of the current are ensured by optimizing the pricking needle structure. The device comprises a power supply, an insulating bottom plate, an insulating force application block, an acupuncture electrode array and a pressurizing device, and is simple in structure and convenient to operate. Compared with the prior art, the method has the advantages of being uniform in current distribution, stable in connection, low in preparation cost and high in welding quality, and is suitable for connection of thermoplastic composite materials in the fields of aerospace, automobile manufacturing, electronics and the like.

The invention relates to the technical field of medical equipment, in particular to an analyte sensor needle assisting device and an analyte sensor implanting device. The analyte sensor implanting device adopts the locking structure to lock the monitor frame and the shell assembly, after the locking structure is unlocked through the unlocking part, the monitor frame moves in the direction close to the human body under the elastic force of the implanting elastic piece, and under the action of the stopping structure, the monitor frame can drive the guide needle frame to move and enable the guide needle to pierce the human body, so that the human body is prevented from being damaged. The analyte sensor is implanted into the human body. According to the invention, the elastic force is applied by implanting the elastic piece to complete the penetration of the guide needle, so that the requirement on the manual operation force is reduced. The guide needle frame can move in the direction away from the human body under the action of the needle returning elastic force of the needle returning elastic piece, then the guide needle is pulled out of the human body, the guide needle can be inserted in place under the action of the implantation elastic piece, the release structure can stably complete the release effect on the stop structure, and the operation difficulty of operators is reduced.

The invention provides high-precision PPS / PTFE membrane filter material processing equipment and a processing technology thereof, and relates to the technical field, the high-precision PPS / PTFE membrane filter material processing equipment comprises a rack, a lifting guide rod is slidably connected to the rack, a needling mechanism is fixedly mounted at the lower end of the lifting guide rod, and the needling mechanism comprises a needling beam plate, a sliding needle frame, an inner needle connecting rod, an outer needle cylinder and a bundling assembly; the sliding needle frame is connected to the needling beam plate in a sliding mode, a plurality of driving guide blocks are arranged on the lower side of the needling beam plate, a driving rack is arranged on the lower side of an extending block, a driving gear is arranged at the upper end of an inner needle connecting rod, and a wedge-shaped sliding block is rotationally connected to the upper side of the driving gear; the collecting assembly comprises a collecting support, a collecting worm, a collecting worm gear, a transmission chain and a collecting wheel, the outer needle cylinder is provided with a communicating sliding groove, and the collecting wheel protrudes out of the outer wall of the outer needle cylinder. According to the invention, the bundling assembly can be used for bundling and filling the puncture hole, so that the purpose of needling without holes is achieved, and the filtering efficiency is ensured.

The invention discloses a carbon footprint measuring and calculating method and system in the production process of a needle-punched geotextile product, and belongs to the technical field of carbon footprint accounting, and the method comprises the steps: obtaining a plurality of production processing links of the needle-punched geotextile product; obtaining production data and auxiliary equipment data of a plurality of production processing links; acquiring a carbon emission factor matched with the production data and the auxiliary equipment data; and constructing a carbon footprint accounting model, and performing calculation based on the carbon footprint accounting model, the carbon emission factors, the production data and the auxiliary equipment data to obtain the carbon footprint in the production process of the needle-punched geotextile product. According to the method, the carbon footprint in the needle-punched geotextile production process can be comprehensively and accurately measured and calculated, an enterprise is assisted to locate a carbon emission key link, an energy-saving and emission-reducing strategy is formulated according to the carbon emission key link, the environmental competitiveness and the sustainable development capacity are improved, and effective technical support and reference examples are provided for carbon footprint measurement and calculation in related industries.

The invention discloses a needle-punched glass fiber aerogel sound-absorbing plate which comprises the following components: 30-50% of a silicon dioxide aerogel precursor, 20-40% of a needle-punched glass fiber felt, 1-3% of a silane coupling agent, 0.5-1% of a dispersing agent, 0.2-0.5% of a defoaming agent, 3-8% of reinforced fibers and 2-5% of a binder. Through needled glass fiber mat reinforcement, silane interface modification and normal-pressure drying processes, collaborative optimization of high strength (compressive strength is greater than 0.64 MPa), high sound absorption performance (sound absorption coefficient is greater than 0.8) and low heat conductivity coefficient (0.018) of the material is realized. The preparation process is simple, the cost is low, and the material is suitable for noise treatment in the fields of buildings, automobiles, aerospace and the like and has remarkable economic benefits and environmental benefits.

The invention provides a machine learning-based acupuncture combined transcranial magnetic stimulation scheme selection method, which comprises the following steps of: performing acupuncture on an object, recording acupuncture data, and obtaining acupuncture text characteristics; the acupuncture data comprises acupuncture object data and acupuncture operation data, the acupuncture object data comprises gender, age, disease name, symptom, medical history and living habit, and the acupuncture operation data comprises body position, acupuncture point, acupuncture sequence, needle inserting, needle moving and duration; performing transcranial magnetic stimulation on the needled object for multiple times to obtain transcranial magnetic stimulation data, the transcranial magnetic stimulation data including hot spot positioning, working parameters, process data and effect data, and obtaining transcranial magnetic stimulation features; establishing association between acupuncture text features and transcranial magnetic stimulation features, constructing a database storing multiple groups of acupuncture combined transcranial magnetic stimulation schemes, and selecting a layered random forest regression model for training; and selecting an acupuncture combined transcranial magnetic stimulation scheme from the database according to actual data by using a reverse prediction method.

The invention belongs to the field of petrochemical engineering, and particularly relates to high-stability rubber composite modified asphalt and a preparation method thereof. The rubber composite modified asphalt provided by the invention comprises the following components in parts by mass: 100 parts of petroleum asphalt, 2-3 parts of an SBS modifier and 20-30 parts of a rubber modifier. 0.1-0.3 part of a stabilizer and 2-3 parts of a cosolvent; the petroleum asphalt is 70 # road petroleum asphalt, and the needle penetration is 60-801 / 10mm; the SBS modifier is a styrene-butadiene-styrene block copolymer, the mass ratio of a styrene chain segment to a butadiene chain segment in the block copolymer is 30: 70, and the weight-average molecular weight of the block copolymer is 150000-250000; the rubber modifier is desulfurized rubber particles, and the particle size is 30-60 meshes. The rubber composite modified asphalt provided by the invention has excellent storage stability on the basis of meeting basic index requirements of asphalt products.

A nail penetration test device, which can improve the performance of nail penetration tests. The device comprises: a voltage acquisition module, which comprises a first connection port and a second connection port, the first connection port being connected to a nail, and the second connection port being connected to a first electrode terminal of a battery cell; and a nail mechanism, which is used for controlling the nail to move towards the battery cell. The voltage acquisition module is used for measuring the voltage between the nail and the first electrode terminal during the process of the nail moving towards the battery cell, the voltage being used for determining an initial penetration position of the nail on the battery cell.