89results about How to "High energy absorption" patented technology

A method of selectively transferring devices arrayed on a first substrate to a second substrate on which an adhesive resin layer is previously formed is disclosed. The method includes steps of selectively heating the adhesive resin layer on the second substrate by laser irradiation from the back surface side of the second substrate, and curing the selectively heated portions of the adhesive resin layer, thereby adhesively bonding those to be transferred of the devices to the second substrate. At this time, portions, corresponding to the devices, of the adhesive layer is heated directly or indirectly via the devices or wiring portions by laser irradiation from the back surface side of the substrate. The heated portions of the adhesive resin layer selectively exhibit the adhesive forces. The heated portions of the adhesive layer are then cured, so that only the devices to be transferred are selectively transferred to the second substrate. As a result, only the devices to be transferred can be certainly, efficiently, and accurately transferred without exerting adverse effect on other parts.

The invention discloses a three-cylinder type large-capacity magneto-rheological damper for vibration control of a large civil engineering structure, which comprises a magneto-rheological damping cylinder (9), a puddle damping cylinder (5), an auxiliary cylinder (19), a magneto-rheological main piston (23), a puddle piston (6), a piston rod (17), a sealing baffle (20), a damping channel (16), a cylinder cover (3) and a spherical hinge joint (13), wherein magneto-rheological liquid (11) is filled in the magneto-rheological damping cylinder, and an annular excitation coil (8) capable of generating a magnetic field is arranged in the magneto-rheological damping cylinder; and the puddle damping cylinder is arranged adjacent to the magneto-rheological damping cylinder, and elastic puddle (7) is filled in the inner cavity of the puddle damping cylinder, thus the damper can generate large damping under the condition of large displacement, and the safety of the damper can be improved. By arranging a displacement splitting mechanism (18), the magneto-rheological damper has high rigidity and large damping in a low-frequency region and has low rigidity and small damping in a high-frequency region. Compared with the traditional magneto-rheological damper with the same size, the maximum capacity of the damper of the invention is improved by more than one time, and the vibration control of the large civil engineering structure is more effective.

A buffer combining polymeric elastic components and metal friction components comprises a shell, one set of the polymeric elastic components, one set of metal spacers, a wedge block installation cylinder, a set of wedge block bodies, a pressing block, a mandrel, a nut and a thread connection looseness preventing piece. The elastic components, the metal spacers, the wedge block installation cylinder, the wedge block bodies and the pressing block are fixedly connected with the shell through the nut and the thread connection looseness preventing piece which are arranged at the end of the mandrel. The buffer has the beneficial effects that compared with an existing elastic body buffer, the buffer is higher in energy absorption rate; the working environment of the elastic components and the metal spacers is superior to that of elastic components and metal spacers of the existing elastic body buffer; and the buffer is simple in structure, small in part number, low in manufacturing cost, easy to use, maintain and operate and high in reliability.

The invention discloses a composite light structure with a high energy absorbing rate and good buffer ability and a structure main body. The composite light structure with the high energy absorbing rate and good buffer ability comprises a housing and an inner support, wherein the housing is sealed and hollow; the inner support is connected in the housing; the inner support is of a dot matrix structure; the inner support comprises a plurality of unit cells which are arranged according to a preset rule; and each cell unit is in the shape of a framework comprising a plurality of supporting rods. The composite light structure with the high energy absorbing rate and good buffer ability and the structure main body disclosed by the invention have the characteristics of relatively small weight, relatively high specific areas, strong energy absorbing ability and relatively strong buffer ability.

The invention provides a preparation method of a carbon nanotube reinforced foamed aluminum composite material for vibration attenuation and energy absorption, relates to the manufacturing of an alloy with open or closed pores, and specifically relates to the preparation method of the carbon nanotube reinforced foamed aluminum composite material for vibration attenuation and energy absorption with urea as a pore-forming agent and nickel as a carbon nanotube synthesis catalyst; the preparation method comprises the following steps: preparing the mixed powder of nickel nitrate, urea and aluminum powder; preparing a foamed aluminum blank; and preparing the carbon nanotube reinforced foamed aluminum composite material. The method is used for overcoming the defects of structural defect, low mechanical properties and low buffer energy-absorption property, large density and no lightweight property of the foamed aluminum materials prepared in the prior art, complex preparation process, relatively high cost and difficult realization of functional structure integration of the foamed aluminum serving as an energy-absorption material.

The invention discloses an energy-saving, self-adaptive and intelligent streetlamp system. The energy-saving, self-adaptive and intelligent streetlamp system comprises a master control module, an LEDintegrated module, a solar cell panel, a storage battery module and a grid-connected running module and also comprises an information receiving and closed-loop feedback module, a power regulation module, a light-emitting part adjustment module and a cell panel adjustment module, wherein the power storage module is used for storing surplus electric energy which is generated by a solar cell panel and cannot be consumed, the light-emitting part adjustment module is controlled by the master control module and is used for adjusting the height and an irradiation angle of a light-emitting part according to environmental data, the LED integrated module is used for substituting a traditional streetlamp light-emitting part, and the power adjustment module is used for adjusting an output power and controlling light-emitting brightness under control of the master control module. By the energy-saving, self-adaptive and intelligent streetlamp system, the lighting effect of a streetlamp can be optimized, the night sight distance is extended, the travelling safety at night is improved, the energy utilization ratio is improved, and the effects of energy saving and emission reduction are achieved.

The invention discloses an automobile anti-collision system. The automobile anti-collision system comprises an energy absorbing box connected with an automobile anti-collision beam and a front longitudinal beam in the front-back direction. The energy absorbing box comprises a main body, pushing rods, first pressing plates, first springs, a second pressing plate, a connecting seat, connecting rods,a sliding rail, sliding blocks, second springs and pistons. First partition cavities are formed in the end, close to the anti-collision beam, of the main body in an up-down symmetry mode. The first pressing plates are mounted in the first partition cavities through the first springs. The anti-collision system further comprises a main control module, a sensor detection module, a radio frequency module, a GPS positioning module, a display module, a pre-warning module and an execution module. The automobile anti-collision system integrates an energy absorbing box passive anti-collision mechanismwith the high energy absorption rate and the good anti-collision effect and active anti-collision control, automobile collision can be effectively prevented, the loss caused by automobile collision can be reduced to a great extent, the anti-collision effect is remarkable, thus the travelling safety is ensured, and practicability is high.

The invention belongs to the technical field of fiber manufacturing, and more specifically relates to an antibacterial deodorizing nanometer fiber, and a preparation method thereof. The antibacterialdeodorizing nanometer fiber is prepared from, by weight, 22 to 26 parts of nanometer titanium dioxide, 30 to 35 parts of chitosan, 3 to 5 parts of rose flower, 55 to 60 parts of Glacial Acetic Acid, 2to 4 parts of single layer graphene, 2 to 3 parts of bamboo fiber micropowder, 1 to 2 parts of carboxymethylcellulose sodium, and 1 to 2 parts of garlic essential oil. The antibacterial deodorizing nanometer fiber possesses excellent bacteria killing and inhibiting and deodorizing effect; the antibacterial validity and broad spectrum activity of chitosan nanometer fiber are improved; the raw materials are relatively cheap; no high temperature treatment is needed in the preparation process; the preparation process is simple and convenient; cost is low; efficiency is high; no pollution is caused; and energy consumption is low.

The invention relates to a railway vehicle anti-creeping buffering structure which comprises a buffering beam, traction beams, a vehicle hook base, an anti-creeping energy absorbing structure and a vehicle hook energy absorbing structure. The vehicle hook base is fixedly connected to the end portions, located at the crosswise middle position of a vehicle body chassis, of the traction beams, the vehicle hook energy absorbing structure is fixedly connected to the vehicle hook base, the anti-creeping energy absorbing structure is fixed to the middle position of the buffering beam and comprises an anti-creeping tooth and two energy absorbing pipes, the anti-creeping tooth is fixed to the front ends of the two energy absorbing pipes, and the rear ends of the energy absorbing pipes are fixed to the vehicle hook base. According to the railway vehicle anti-creeping buffering structure, the anti-creeping energy absorbing structure and the vehicle hook energy absorbing structure are connected to the parts, located at the crosswise middle position of a vehicle body, of the traction beams, the effective energy absorbing length can be increased, the energy absorbing amount is increased to the maximum, and mutual interference of the anti-creeping energy absorbing structures on the end portions of two vehicles when the vehicles pass through curves is avoided.

The invention relates to a limiting device of an electric trolley of a bridge type crane. The limiting device comprises a trolley frame and wheels, wherein the left and right ends of the trolley frame are both provided with rail sweeping plates the lower ends of which are provided with notches; the center of the lower part of the trolley frame is provided with a safe ruler; running tracks are arranged under the wheels; the running tracks, close to the left and right ends, are symmetrically provided with approach switch groups comprising approach switches A close to the inner side and approach switches B close to the outer side; the frontage surfaces of the running tracks close to the outer sides of the approach switches B are provided with fixed bases; the upper sides of the fixed bases are provided with telescopic cylinders; the top ends of the telescopic cylinders are provided with brake blocks which are provided with brake grooves. The limiting device has the advantages of simple structure, limiting accuracy, good braking effect and convenience in installation and maintenance.

A high polymer elastic component and metal friction component combined buffer with a polygonal housing comprises a housing, a group of high polymer elastic components, a group of metal spacers, a wedge-shaped block mounting body, a wedge-shaped block body, a press block, a mandrel, a nut and a thread connecting anti-loosening part, wherein the high polymer elastic components, the metal spacers, the wedge-shaped block mounting body, the wedge-shaped block body and the press block are fixedly connected with the housing through the nut and the thread connecting anti-loosening part, which are at the end part of the mandrel. The invention has the beneficial effects that the high polymer elastic component and metal friction component combined buffer has higher energy absorbing rate than the traditional elastomer buffer, and working environments of the elastic components and the metal spacers of the high polymer elastic component and metal friction component combined buffer are better than those of the traditional elastomer buffer; and the high polymer elastic component and metal friction component combined buffer also has the advantages of simple structure, low part number, low manufacturing cost, simple use and maintenance and high reliability.

The invention discloses an automobile intelligent shape memory alloy energy absorbing structure and a control method thereof. The automobile intelligent shape memory alloy energy absorbing structure comprises an anti-collision beam main body, a front buffering energy absorber, a side collision preventing energy absorber and a microcomputer control system, wherein the anti-collision beam main body is connected with a longitudinal beam through a sleeve type energy absorbing box; the front buffering energy absorber is connected with the anti-collision beam main body through a shape memory alloy wire; the side collision preventing energy absorber is spliced at the two ends of the anti-collision beam main body; the rear end plate of the side collision preventing energy absorber is connected with the end part of the anti-collision beam main body through a shape memory alloy wire; and the microcomputer control system can control the heating temperature of the shape memory alloy wire. The invention further discloses a control method for the automobile intelligent shape memory alloy energy absorbing structure. The invention is advantaged in that the automobile intelligent shape memory alloy energy absorbing structure can perform multi-stage controllable collision energy absorption under a plurality of collision environments to furthest protect passengers and vehicles.

The invention discloses a composite type energy-absorbing anti-creeper of a rail vehicle. The composite type energy-absorbing anti-creeper comprises a piston rod, a flange, an inner sleeve and an outer sleeve, wherein the inner sleeve is arranged in the outer sleeve in a sealing mode; damping liquid is arranged in the inner sleeve; one end of the piston rod is equipped with a piston which can be in sliding connection to the inner sleeve; a damping hole is formed in the inner sleeve; a damping hole sealer is arranged on the damping hole; a guide hole which is in sliding connection to the pistonrod is formed in the flange; one side of the flange is fixedly connected to one end of the inner sleeve and one end of the outer sleeve; the other side of the flange is equipped with a cutting tool;and the cutting tool extends into a guide slot in the piston rod. According to the anti-creeper disclosed by the invention, a cut cutting part pushes the piston to extrude the damping liquid to absorbenergy, so that energy absorption and electric load resistance of the device are greatly improved, and therefore, the anti-creeper is high in collision force stability and energy-absorbing efficiency, and is good in energy-absorbing adjustability; and damping hole sealers of different specifications are selected, so that rail vehicle collision working conditions under different speed grades can be met, and therefore, collision resistance of the rail vehicle are improved.

The invention belongs to the field of passive safety protection, and relates to a thin-wall pipe, in particular to a folded paper type thin-wall pipe. The problems of irregular deformation and poor force stability of a common thin-wall pipe during compression are solved. The folded paper type thin-wall pipe comprises a plurality of single-layer folded paper circular rings, wherein the plurality ofsingle-layer folded paper circular rings are sequentially connected along the axial direction to form a pipe body.

The invention discloses a doorsill beam assembly which comprises a side wall outer plate, a side wall doorsill beam, a front floor doorsill beam, a doorsill lower longitudinal beam outer plate and a doorsill lower longitudinal beam inner plate. The side wall outer plate and the side wall threshold beam are fixed so that a first buffer cavity can be defined between the side wall outer plate and theside wall threshold beam. The front floor threshold beam and the side wall threshold beam are fixed to define a second buffer cavity between the front floor threshold beam and the side wall thresholdbeam, and the second buffer cavity is formed in the inner side of the first buffer cavity; the doorsill lower longitudinal beam outer plate and the doorsill lower longitudinal beam inner plate are fixed to define a third buffer cavity between the doorsill lower longitudinal beam outer plate and the doorsill lower longitudinal beam inner plate, and the third buffer cavity is formed in the inner side of the first buffer cavity and located on the rear side of the second buffer cavity. According to the doorsill beam assembly, by arranging the multi-stage energy absorption structure, the energy absorption capacity of the whole doorsill beam can be effectively increased, and then the collision safety of a vehicle is improved, so that the riding safety of passengers is guaranteed.

The invention discloses a preparation method of foamed nickel based on a P-curved space structure, and belongs to the field of high-temperature structural material preparation. The preparation methodmainly comprises the following steps: 3D printing a P-curved space structure by using PLA material, preparing a coating slurry, and pouring the coating slurry. Regarding the foamed nickel material prepared according to the method, the porosity and structure of the to-be-prepared foamed nickel material can be directly controlled by controlling the parameters of the P-curved space spatial structure,so as to achieve suitable mechanical properties. The foamed nickel material having a P-curved space structure not only has the characteristics of high porosity, small specific gravity, large specificsurface area, high specific strength, good damping and shock absorption performance, excellent heat insulation and sound insulation performance which common foamed metal has, the foamed nickel material according to the method also has an adjustable porosity to meet the specific performance requirements, so that the prepared foamed nickel is more suitable for the needs of the various industrial productions.

The invention is suitable for the technical field of passive safety protection devices, and provides a combined energy absorber. The combined energy absorber comprises a collision baffle, a flanged pipe, a base and an energy absorption assembly, wherein one end of the flanged pipe is fixedly connected with the collision baffle, and a plurality of cutting grooves are formed in the pipe wall of theflanged pipe in the axis direction of the flanged pipe; the other end of the flanged pipe abuts against the base, and the side, which is away from the flanged pipe, of the base is used for being connected with a vehicle body; and the energy absorption assembly is arranged in the flanged pipe and fixedly connected with the collision baffle. According to the forming die, the base abuts against the other end of the flanged pipe, and the plurality of cutting grooves are formed in the pipe wall of the flanged pipe in the axis direction of the flanged pipe, so that the flanged pipe can crack, overturn, curl and absorb energy under the constraint of the base in the collision process. Meanwhile, the energy absorption assembly is arranged in the flanged pipe, so that the base can compress the energy absorption assembly to absorb energy in the operation process, and the overall energy absorption capacity of the energy absorber is improved.

A selective laser melting method of blocky ternary eutectic oxide ceramic adopts a CO2 laser selective melting method, the scanning rate and the laser power of the CO2 laser selective melting method are controlled within ranges shown in the specification, and a melt material in a laser scanning area obtains higher supercooling degree, the nucleation rate is increased, so that the eutectic structure is refined, and the mechanical properties of a sample is improved. The large-size blocky Al2O3-GdAlO3-ZrO2 eutectic ceramic is obtained through preparation, and the size of the prepared Al2O3-GdAlO3-ZrO2 eutectic ceramic reaches 20*18*3.5 mm<3> after the Al2O3-GdAlO3-ZrO2 eutectic ceramic is subjected to linear cutting. The scanning rate can reach 5000 mm / s at most, the energy absorption rate ofthe ceramic material to a CO2 laser is high, and complete melting and solidification forming of the oxide ceramic material are better facilitated. Meanwhile, a laser beam selectively melts and solidifies a powder layer according to a path and parameters set by a computer, layer-by-layer stacking is carried out, and a solidified eutectic ceramic sample with a large size and a complex shape can beprepared.

The invention discloses a reinforced body-in-white frame, which comprises a vehicle body front end frame, a lower vehicle body frame, a side wall frame, a top cover frame and a tail frame. The upper portion of the vehicle body front end frame is fixedly connected with the front portion of the top cover frame. The rear portion of the vehicle body front end frame is fixedly connected with the frontportion of the lower vehicle body frame. The rear portion of the lower vehicle body frame is fixedly connected with the front portion of the tail frame. The upper portion of the tail frame is fixedlyconnected with the rear portion of the top cover frame. The longitudinal section of a front buffer beam and the longitudinal section of an energy absorption box of the vehicle body front end frame areboth in a shape like a Chinese character 'mu', and anti-collision supporting plates are arranged in the middle of the front buffer beam and a front end module. According to the reinforced body-in-white frame, the energy absorption capacity of the energy absorption area of the vehicle body front structure in the head-on collision process is increased, the transverse rigidity and the forecabin yawing mode of the vehicle body front structure are improved, the head-on collision safety performance and the force transmission efficiency are improved, the overall strength of the vehicle body frame isimproved, and therefore the riding comfort is improved.

The invention discloses a metal energy absorption device which comprises a metal anti-climbing plate, a metal energy absorption pipe and a deformation induction structure, the deformation induction structure comprises a first section, a second section, a third section and a fourth section which are sequentially connected, and the average peripheral diameter of the first section, the average peripheral diameter of the second section, the average peripheral diameter of the third section and the average peripheral diameter of the fourth section are sequentially increased; the upper end of the metal energy absorption pipe is fixedly connected with the metal anti-climbing plate, and the lower end of the metal energy absorption pipe at least sleeves the periphery of the first section of the deformation induction structure and is tightly connected with the first section; planing cutters are arranged on the upper end face of the first section along the periphery, induction grooves are formed in the inner wall of one end of the metal energy absorption pipe in the length direction, and the positions and the number of the planing cutters are matched with the positions and the number of the induction grooves. According to the metal energy absorption device, energy absorption in four forms and four stages of planing, bulging deformation, tearing and curling deformation is achieved for the metal energy absorption pipe, the four deformation modes and generated impedance force are all conducted according to pre-design, the whole process is orderly and controllable, and the energy absorption efficiency is high.

The invention discloses a lightweight high-explosion-resistant unit plate and a protection product thereof. The unit plate comprises an outer metal plate layer, a middle metal plate layer, an inner metal plate layer, an energy absorption layer and a foam metal plate layer which are arranged in parallel. The energy absorption layer comprises a plurality of energy absorption sub-layers, and each energy absorption sub-layer comprises a plurality of energy absorption pipes which are arranged in parallel. The energy absorption pipes of every two adjacent energy absorption sub-layers are perpendicular to each other. The energy absorption layer is arranged between the outer metal plate layer and the middle metal plate layer, and the foam metal plate layer is arranged between the middle metal plate layer and the inner metal plate layer. The outer surfaces of the outer metal plate layer, the middle metal plate layer, the inner metal plate layer, the energy absorption pipes and the foam metal plate layer are all sprayed with explosion-resistant paint. The lightweight high-explosion-resistant unit plate has the advantages of being high in resistance, small in weight and convenient to transport, and is suitable for manufacturing explosion-resistant doors, explosion-resistant walls, explosion-resistant roofs and wall column protection plates.

The invention discloses a high-temperature resisting anti-cracking clutch facing. The high-temperature resisting anti-cracking clutch facing is prepared from the following raw materials in parts by weight: 2 to 4 parts of styrene-butadiene rubber, 0.3 to 0.6 part of modified bamboo fibers, 0.3 to 0.6 part of ceramic fibers, 5 to 7 parts of strengthened material, 1 to 2 parts of single-layer graphene, 5 to 7 parts of nano-silica, 1 to 3 parts of nano titanium dioxide, 4 to 6 parts of zinc stearate, 0.5 to 1 part of sulfur and 15 to 18 parts of phenolic resin. The high-temperature resisting anti-cracking clutch facing has the advantages of high strength, good toughness, stable friction coefficient, good anti-jitter performance, high rotating burst strength, stable friction performance at high temperature and low possibility of producing degradation phenomenon; in addition, the high-temperature resisting anti-cracking clutch facing is an environment-friendly product. According to a preparation technology of the high-temperature resisting anti-cracking clutch facing disclosed by the invention, the preparation technology targeted for specific components is optimized, so that the fusionand the crosslinking of the components are more sufficient; in addition, the preparation process is green and environmentally friendly.

The invention discloses an automobile side wall frame reinforcing assembly, which comprises an A-pillar reinforcing assembly, a B-pillar reinforcing assembly, a threshold reinforcing assembly, a C-pillar reinforcing assembly, a D-pillar reinforcing assembly, a side wall roof side rail reinforcing assembly and a rear side wall connecting assembly. The rear end of the upper part of the A-pillar reinforcing assembly is fixed at the front end of the side wall roof side rail reinforcing assembly. The rear end of the lower part of the A-pillar reinforcing assembly is fixed to the front end of the threshold reinforcing assembly. The upper end part of the B-pillar reinforcing assembly is fixed on the A-pillar reinforcing assembly. The lower end of the B-pillar reinforcing assembly is fixed to thethreshold reinforcing assembly. The rear end of the threshold reinforcing assembly is fixed to the front end of the rear side wall connecting assembly. The upper end of the C-pillar reinforcing assembly is fixed to the side wall roof side rail reinforcing assembly. The upper end of the D-pillar reinforcing assembly is fixed to the rear end of the side wall roof side rail reinforcing assembly. According to the automobile side wall frame reinforcing assembly, the energy absorption capacity of an automobile body structure in the side collision process can be increased, the invasion amount and theinvasion speed are reduced, and threshold overturning is reduced.

YThe multi component structure of the vanes of an aerogenerator aims to solve the low absorbing efficiency and strength and costly feature of the existing aerogenerator with vanes of multi component fault wind exhaust, improving wind power absorbing rate 15%, improving power supply due to the expansion of vane area by 20% and reducing cost by10% with the vanes of the same strength.

The invention provides an energy absorbing type rear protection device capable of automatically adjusting height. The energy absorbing type rear protection device capable of automatically adjusting the height comprises two ground clearance detection mechanisms, two 4-shaped brackets, a transmission mechanism, B-shaped cross beams and energy absorbing units; the two 4-shaped brackets are symmetrically mounted on the external side surfaces of two longitudinal beams at the tail part of a commercial vehicle; the two 4-shaped brackets are connected with each other through the transmission mechanism; the B-shaped cross beams are connected to the end surfaces, facing the vehicle tail, of the 4-shaped brackets through the energy absorbing units; the two ground clearance detection mechanisms are correspondingly connected to the internal sides of the two longitudinal beams at the tail part of the commercial vehicle through connecting pins; each ground clearance detection mechanism comprises a connecting head, a connecting rod and a plate with a universal wheel; the connecting heads are mounted on the internal sides of the longitudinal beams at the tail part of the commercial vehicle throughconnecting pins; and the connecting heads can rotate around the connecting pins. According to the energy absorbing type rear protection device capable of automatically adjusting the height, the obstacle crossing ability is realized, collision energy can be stably absorbed stage by stage, the rigidity in the height direction is distributed in a graded manner, and an automobile suffering rear-end collision can be effectively prevented from getting to the bottom of a truck.

The invention belongs to the technical field of vacuum application, and relates to vehicle-mounted energy-saving and environment-friendly vacuum rapid precooling equipment for fruit and vegetable. Thevacuum rapid precooling equipment comprises a vacuum heat insulation outer box and a honeycomb expansion plate heat sink inner box, and vacuum heat insulation layers are arranged between the vacuum heat insulation outer box and the honeycomb expansion plate heat sink inner box; the honeycomb expansion plate heat sink inner box is formed by supercharging and bulging double-layer metal plates, and / or the inside surface of the honeycomb expansion plate heat sink inner box is blackened; and thus, the rapid cooling of the stored fruit and vegetable is benefited. Vacuum pressure is provided for thehoneycomb expansion plate heat sink inner box by a vehicle exhaust gas utilization device through a working medium generator, an injection pump and the like; the vacuum pressure is supplemented and provided for the honeycomb expansion plate heat sink inner box through a holding pump and a differential pressure valve II; and the honeycomb expansion plate heat sink inner box is maintained in the low temperature state through a refrigerator and a low temperature valve. The equipment stated in the application is rational in structural design, and the effects of energy saving and emission reduction are achieved; the equipment is high in practicability, and especially suitable for cold chain logistics transportation of fruit and vegetable product origins; the effective preservation and long-time storage of the fruit and vegetable are ensured, and the application range is wide, and the economic benefits are very obvious.

The invention discloses an electron beam surface alloying method for 45# steel. The electron beam surface alloying method comprises the steps of preset coating on the surface of the 45# steel and scanning through continuous electron beams, wherein the preset coating comprises the step that tungsten powder is sprayed on the surface of the 45# steel by plasma thermal spraying to form a spraying bonding layer; and scanning through continuous electron beams comprises the step that electron beam scanning is carried out on the surface of the 45# steel so as to obtain a surface alloying modification layer on the surface of the 45# steel. According to the electron beam surface alloying method, the continuous electron beam scanning technology is combined with the plasma thermal spraying, the novel medium-carbon steel-based composite material which takes a high-performance alloying element as a reinforced phase is prepared by adopting the unique advantages of the continuous surface treatment, so that the procedures are greatly simplified, the cost is reduced, the turnover time is shortened, and the surface performance of the 45# steel is improved and the service life of the 45# steel is prolonged by preparing the alloy layer with high hardness, high abrasion resistance and high corrosion resistance.

The invention provides a multi-wavelength laser processing light path system of melting additive manufacturing equipment. The system is suitable for the field of metal additive manufacturing. The light path system device comprises a laser (6), an optical lens (5), a collimator (4), a movable frequency conversion device (3), a focus lens (2) and a scanning galvanometer (1). According to the multi-wavelength laser processing light path system, the position and the angle of the movable frequency conversion device are controlled through a control system, thereby achieving switching processing among different wavelengths. A processing device can sinter and form different powder, and meanwhile, the energy absorption rate of different powder is effectively improved, so that the processing efficiency is improved.

The invention discloses a foamed aluminum ribbed sandwich panel which comprises two aluminum panels, at least one foamed aluminum and at least one rib, wherein the at least one rib and at least one foamed aluminum are adhered to form a foamed aluminum sandwich structure of which the shape and size are completely the same as those of the cross section of each aluminum panel; the at least one rib is perpendicular to the top surface and bottom surface of the foamed aluminum sandwich structure; and the two aluminum panels comprise an upper aluminum panel and a lower aluminum panel and are respectively adhered to the top surface and the bottom surface of the foamed aluminum sandwich layer. The foamed aluminum ribbed sandwich panel with the structure is applied to serve as an energy absorption buffer device for bearing impact loads which are uniformly distributed and has the advantage of high energy absorption efficiency.

The invention discloses a cargo compartment floor lower energy absorption structural unit for improving the crashworthiness of aircrafts. The cargo compartment floor lower energy absorption structuralunit comprises an upper face plate, a lower face plate, a plurality of composite material thin-walled square tubes and a foam material layer. The cargo compartment floor lower energy absorption structural unit has the advantages that the upper face plate and the lower face plate are made from high-strength aluminum alloy or carbon fiber / epoxy resin composite materials, the composite material thin-walled square tubes which are arranged between the upper face plate and the lower face plate are made from carbon fiber or glass fiber composite materials, accordingly, the cargo compartment floor lower energy absorption structural unit is relatively low in paid weight cost as compared with metal energy absorption structural units with identical volumes, load on the aircrafts can be relieved, andthe economic performance can be improved; each composite material thin-walled square tube crazes along four apex angles in falling and crashing procedures, layer bundles are bent, layered and the like to fail, and most energy can be ultimately absorbed in layer bundle bending failure-mode (open-mode) squashing forms.