1842results about How to "Increase in size" patented technology

The invention discloses a water pressure testing device for steel pipe compression resistance detection and a testing method thereof.The device comprises a supporting assembly, a moving assembly and a fixed sealing assembly, the supporting assembly comprises a base and a pair of supporting frames fixedly connected with the top of the base, and the moving assembly is arranged above the base; the moving assembly is arranged on the base and fixedly connected with the base, and the fixed sealing assembly is connected with the moving assembly, used for fixing the steel pipe and capable of sealing the two ends of the steel pipe. The driving motor drives the positive and negative screw rod to rotate, so that the pair of moving plates move in opposite directions, the abutting blocks can abut against the inner wall of the steel pipe in the opposite moving process of the moving plates, the steel pipe can be stabilized through the abutting effect of the abutting blocks, the displacement phenomenon of the steel pipe during water pressure testing is avoided, and when the moving plates move, the steel pipe is prevented from moving. The steel pipe can be subjected to double-layer sealing, the sealing effect is good, and the accuracy of a test result can be improved.

A buffering hardware hinge outside a cup comprises a hinge cup and a hinge arm, the hinge cup and the hinge arm are connected in a hinged mode through an upper connecting rod and a lower connecting rod, a guide groove penetrating through a body is formed in the bottom of the hinge cup, and a driving plate is installed at the outer bottom of the hinge cup in a covering mode; a sliding block is arranged on the top of the driving plate and installed in the guide groove in a sliding mode. The end, facing the hinge cup, of the upper connecting rod extends outwards to form a driving arm, and when the hinge is closed, the driving arm acts on the sliding block to push the sliding block to slide in the guide groove; a buffer is fixedly mounted at the outer bottom of the hinge arm, a piston rod or a cylinder body part of the buffer is connected with the driving plate, and the buffer has a damping effect on the movement of the driving plate, so that the damping effect when the hinge is closed is realized. The device has the beneficial effects that the buffer is installed outside the hinge arm, through the design of the guide groove and the driving plate, the external space is effectively utilized, and the problem that the internal space is limited is avoided.

The invention provides an ultrafast laser welding method and device for large-spacing heterogeneous materials. The ultrafast laser welding method specifically comprises the steps that a lower workpiece and an upper workpiece are stacked and clamped through a clamp; a laser beam is collimated, then enters a scanning galvanometer and is focused through a field lens after being emitted, first scanning laser energy is absorbed by a lower-layer material to generate plasma, the plasma continuously expands and overflows, meanwhile, the lower-layer material is melted to fill a gap, and the quasi-optical contact condition is achieved; free expansion of plasmas in second scanning is effectively inhibited, laser energy is limited near a welding seam, the melting volume of the area is remarkably increased, and the welding strength is remarkably improved; and the third scanning and the second scanning are consistent in mechanism, the material melting amount is increased, and finally welding head strengthening is achieved. Through the scanning galvanometer and the field lens, a focusing light spot moves along a specified route in the contact surface of the upper and lower workpieces, so that the workpieces are melted and combined. After three times of scanning, the large-spacing heterogeneous material can finally obtain a high-strength and high-quality welding joint.

The invention relates to the technical field of sodium ion batteries, in particular to a sodium ferric sulfate positive electrode material and a preparation method and application thereof. The preparation method of the sodium ferric sulfate positive electrode material comprises the following steps: obtaining a carbon foam substrate; weighing raw materials according to the stoichiometric ratio of the sodium ferric sulfate positive electrode material, and adding the raw materials into a solvent to obtain a mixed solution; depositing the mixed solution on a carbon foam substrate by adopting an electrostatic spray deposition method to obtain a precursor film; and sintering the precursor film to obtain the sodium ferric sulfate positive electrode material. According to the preparation method, the carbon foam is adopted as a substrate material, the sodium ferric sulfate precursor is prepared through electrostatic spray deposition, and then the sodium ferric sulfate material is obtained through sintering treatment, so that the specific discharge capacity, the rate capability and the cycle performance of the sodium ferric sulfate material are all remarkably improved.

The invention discloses a prothallus proliferation culture medium and a rapid propagation method for rare and endangered plant cibotium barometz. The prothallus proliferation culture medium of cibotium barometz is used for accelerating the proliferation of gametophytes, and the prothallus maturation time is shortened; meanwhile, the invention provides a rapid propagation method of cibotium barometz, which comprises the following steps: carrying out artificial sterile culture on cibotium barometz spores, rapidly germinating in a culture bottle to form prothalli, culturing on a prothalli proliferation culture medium, inducing and transforming gametophytes in a specific matrix outside the bottle to form sporophytes by virtue of an incomplete tissue culture method, and transplanting. According to the method, the formation of prothallium is accelerated, the sporophyte conversion rate is increased, the reproduction rate is increased while the domestication and reproduction of sporophyte seedlings are accelerated, a large number of cibotium barometz seedlings which grow healthily can be obtained, the survival rate reaches 90%, the spore breeding period is obviously shortened, the operation requirement is not strict, and the method is suitable for large-scale popularization and application. The technical problems that the seedlings in the tissue culture bottle are easy to pollute, fragile and low in seedling rate are solved.

The utility model provides a vertical reactor for green ammonia production, which comprises a shell, an internal part is arranged in the shell and divides the shell into a first cavity and a second cavity, an annular space is formed between the outer wall of the internal part and the inner wall of the shell, and a third cavity, a fourth cavity and an electric heater are arranged in the internal part. The device further comprises a lower heat exchanger, an upper catalyst frame assembly, a catalyst reaction cavity and a fifth cavity, a dead gas heat insulation cavity is further formed between the catalyst reaction cavity and the electric heater, and gas inlets are formed in the shell and comprise an annular gap gas inlet, a main gas inlet and a temperature adjusting gas inlet. The shell is cooled through basically constant external cold gas, large temperature fluctuation is prevented, operation under the fatigue working condition is avoided, the service life of the shell is prolonged, the heat dissipation performance of the shell is improved, the service life of the shell is prolonged, and the service life of the shell is prolonged. And the temperature of the catalyst reaction can be adjusted through external cold gas, so that the reaction efficiency of the catalytic reaction is improved.

The invention relates to the field of manufacturing of sensitive elements and sensors in the electronic core industry, in particular to a piezoelectric MEMS acoustic device and a manufacturing method thereof. The device structurally comprises a substrate, an insulating layer, a silicon substrate, a multi-layer composite film structure and a protective layer from bottom to top in sequence, wherein the multi-layer composite film structure is formed by alternately growing electrode layers and piezoelectric layers, and the first layer and the last layer of the multi-layer composite film are the electrode layers; a bonding pad is arranged on the multi-layer composite film structure; the protective layer covers the upper surface of the device; a suspended back cavity structure is arranged between the substrate and the insulating layer; the silicon substrate, the multi-layer composite film structure and the protective layer are connected through an opening communicated with the back cavity; according to the device provided by the invention, the volume of the piezoelectric material is increased mainly by adding the piezoelectric layer, and the energy conversion efficiency of the structure is effectively improved, so that the sensitivity of the transducer is improved.

The real-time blood glucose monitoring device comprises a shell, and the shell is provided with a containing space and a mounting opening communicating the containing space with the outside; the monitoring assembly is arranged in the accommodating space and comprises an electronic unit and a detection unit; the puncture assembly is arranged in the containing space and comprises a puncture part, and the puncture part partially penetrates through the monitoring assembly so that the detection unit can be partially contained in the puncture part; the bottom cover is detachably connected with the shell to seal the mounting opening, the bottom cover is provided with a matching wall which is arranged in the containing space in a protruding and extending mode, the matching wall is provided with a first sealing piece which abuts against the bottom face of the monitoring assembly in a sealing mode to form a sealing cavity, and part of the detection unit and part of the puncturing piece are arranged in the sealing cavity; the area defined by the first sealing piece is smaller than the area of the cross section of the sealing cavity. And the cross section area of the sealing cavity is larger than the area enclosed by the first sealing element, so that the airtightness test is easier to carry out on the basis of ensuring the sealing effect, and the test precision and accuracy are improved.

The invention relates to the technical field of air traffic management, in particular to a low-altitude airspace unmanned aerial vehicle hot-spot-free flight path rapid planning method and system, and the method comprises the steps: receiving a hot-spot-free flight path planning request, and determining the constraint condition of hot-spot-free flight path planning based on the hot-spot-free flight path planning request; based on the starting position, the ending position and the constraint condition, generating a directed graph representing the flight path of the unmanned aerial vehicle in a space-time grid constructed by the eight-in-and-out-point grid airspace model; the edges of the directed graph are endowed with weights based on the airspace use cost and the energy consumption cost, a weighted directed graph is generated, the weighted directed graph is searched based on the airspace use cost and the energy consumption cost, and an optimal path in the weighted directed graph is obtained and serves as a hot-spot-free track; according to the method, the search complexity can be reduced, the execution efficiency is improved, and the airspace use overhead is reduced.

The invention relates to the technical field of clothes processing equipment, in particular to a heat pump washing and drying integrated machine. The problem that an existing heat pump washing and drying all-in-one machine is poor in drying efficiency is solved. Therefore, the heat pump washing and drying all-in-one machine comprises a barrel module and a heat pump module, the heat pump module comprises a first drying air duct, a fan and a second drying air duct which are connected in sequence, an evaporator is arranged in the second drying air duct, and a condenser is arranged in the first drying air duct; a fresh air inlet is formed in the second drying air channel and located between the evaporator and the draught fan. The fresh air inlet is formed in the second drying air duct, in the process of executing the drying program, external dry fresh air can be introduced, the drying efficiency can be improved, in addition, the fresh air inlet is formed between the evaporator and the fan, more fresh air can be introduced, and the drying efficiency is improved. And the temperature of the entering fresh air is not affected by the temperature of the evaporator, and the drying efficiency can be better improved.

The invention belongs to the technical field of batteries, and discloses a battery assembly method and a battery, and the method comprises the following steps: S1, coating a plurality of side surfaces of a pole group with insulating films; s2, a composite cover plate is arranged on the first surface of the pole group; s3, performing hot melting on the insulating film and the first insulating layer; s4, assembling the pole group of which the first surface is provided with the composite cover plate into the cavity of the battery shell; s5, installing a composite cover plate on the second surface of the pole group; s6, welding the composite cover plate and the battery shell; s7, welding the composite pole with the composite shell; and S8, realizing current conduction between the composite pole and the tab. Current conduction is finally realized by the tab and the composite pole, so that the influence of other welding procedures on the connection quality of the tab and the composite pole is avoided, and the tab extends out of the battery shell to realize current conduction with the composite pole, so that the occupation of the internal space is reduced, the utilization rate of the space is improved, and the production cost is reduced. And a space is provided for enlarging the pole group, and the energy density is improved.

The utility model relates to the technical field of vibration motors, in particular to a horizontal linear vibration motor, which comprises a shell with an accommodating space, a vibrator assembly, an elastic piece, a stator assembly and a cover plate, and is characterized in that the vibrator assembly comprises a mass block, magnetic steel and a damping piece, and is suspended in the shell through the elastic piece; the mass block comprises an integrally-formed cuboid body, the surface of the side, facing the cover plate, of the body is concavely provided with a receding coil and a groove penetrating through the body in the width direction, the center of the groove is provided with a square blind groove for containing the magnetic steel, and the blind groove forms the four walls of the mass block. The long side wall of the mass block is vertically and concavely arranged from the free end face of the mass block and penetrates through the long side wall to be used for installing a through groove of the damping piece, a first boss is horizontally and convexly arranged on the edge of the bottom of the long side wall, facing one side of the shell, of the body, and the groove forms a second boss on the free end face of the short side wall of the mass block. The performance of the horizontal linear vibration motor is improved, and the vibration effect of the motor is enhanced.

The invention discloses a preparation method and application of high-dispersion small-particle-size iron phosphate. The method comprises the following steps: 1) dissolving an iron source in a phosphoric acid solution to obtain ferrous dihydrogen phosphate; 2) adding a cellulose additive into the solution obtained in the step 1), stirring and heating; 3) heating to 60-95 DEG C, adding hydrogen peroxide, carrying out oxidation reaction, and aging; and 4) filtering the solvent, washing, drying, and roasting to obtain the iron phosphate. The iron phosphate provided by the invention is in a sheet shape, no agglomeration exists between sheets, the particle size can be as low as 1 micron or below, the grinding efficiency of lithium iron phosphate can be effectively improved, and the electrochemical performance of a lithium battery positive electrode material prepared from the lithium iron phosphate can be effectively improved.

The embodiment of the invention provides a cylindrical battery, a battery pack and an electric device. The cylindrical battery comprises a shell, an electrode assembly and an end cover, the end cover comprises a base body and an end part, the base body comprises a first part and a second part, and the projection of the first part surrounds the projection of the second part in the axial direction. The first part is in insulated connection with the shell; the second part is connected with the first part and the end part; the first portion includes a first surface facing the electrode assembly, and the second portion includes a second surface facing the electrode assembly, the second surface being closer to the end portion than the first surface in the axial direction. And the second surface of the second part is closer to one side of the end part, so that a larger accommodating space is favorably provided for the electrode assembly in the shell of the cylindrical battery, the volume of the electrode assembly is favorably increased, and the energy density of the cylindrical battery is improved.

The invention relates to the technical field of composite current collectors, and discloses a composite current collector. Comprising the following operation steps: S1, uniformly mixing thermal expansion microspheres and a polymer material, and performing melt extrusion and two-way stretching to obtain a current collector base film; s2, depositing a transition layer on each of the two surfaces of the current collector base film to obtain a composite collector film A; s3, depositing a metal layer on each of the two surfaces of the transition layer of the composite film A to obtain a composite film B; and S4, depositing a protective layer on each of the two surfaces of the metal layer of the composite film B to obtain the composite current collector.

The invention relates to an assembling, testing and braiding all-in-one machine which comprises a machine table, a first assembling mechanism and a second assembling mechanism, the machine table is connected with a first feeding disc, the machine table is provided with a feeding and cutting mechanism corresponding to the first feeding disc, one side edge of the machine table is provided with a mounting part, and the mounting part is provided with a receding cavity facing the first feeding disc; the first assembling mechanism comprises a first assembling structure and a second assembling structure, the first assembling structure and the second assembling structure are provided with a first mounting mechanism and a second mounting mechanism corresponding to the mounting part, and the machine table is provided with a second feeding disc and a third feeding disc corresponding to the mounting part in the conveying direction deviating from the first assembling mechanism; the second assembling mechanism is provided with a transfer overturning part facing the second assembling mechanism, the second assembling mechanism is provided with a transfer testing part far away from the transfer overturning part, and the transfer testing part is connected with a braiding machine far away from the transfer overturning part. The invention aims to realize high integration of the machine table, improve the working procedure linkage, and improve the space utilization rate and the processing efficiency.

The utility model discloses an in-situ groundwater heavy metal pollution remediation device. Comprising two permeable reactive barriers arranged at intervals in the groundwater pollution plume runoff direction. A filling cavity is formed between the two permeable reactive barriers, and filling materials are arranged in the filling cavity. According to the utility model, a double-unit permeable reactive barrier is adopted to carry out an in-situ remediation method, the first unit is filled with a zeolite and volcanic rock composite filter material to adsorb and capture heavy metal pollutants, and the second unit is filled with an active charcoal composite filler to further efficiently adsorb residual heavy metals. In addition, a plant planting zone is constructed for planting heavy metal hyperaccumulation herbaceous plants, pollutants such as heavy metal in underground water are thoroughly removed through the absorption and stabilization effect of plants, and the underground water is purified. The device adopts stable, economic, efficient and safe active filler to adsorb and remove heavy metals in underground water, and has the advantages of efficient restoration, strong applicability, ecological environmental protection and the like.

The utility model relates to the technical field of electric excavators, and discloses an electric excavator cabin arrangement structure and an electric excavator, and the electric excavator cabin arrangement structure comprises a mounting platform. The installation platform is divided into a first installation area and a second installation area which are adjacent in the length direction of the installation platform, the first installation area and the second installation area extend in the width direction of the installation platform, and the second installation area is divided into an upper layer and a lower layer which are arranged up and down; a hydraulic main valve, a rotary motor and a controller are installed in the first installation area in the width direction of the installation platform, and a storage battery is installed on the side, away from the second installation area, of the first installation area. In the width direction of the mounting platform, a hydraulic main pump, a motor and a heat dissipation mechanism are mounted on the lower layer of the second mounting area, and a hydraulic oil tank and a battery pack are mounted on the upper layer of the second mounting area. The arrangement space of the cabin is optimized, the structure is compact, and the space utilization rate is improved.

The invention relates to the technical field of diaphragm testing, and provides a diaphragm porosity testing method which comprises the following steps: preparing a diaphragm sample, and obtaining sample basic parameters of the diaphragm sample; completely infiltrating the diaphragm sample with water; testing the soaked diaphragm sample placed in the sample tank through a lithium battery diaphragm gap analyzer according to preset parameters and sample basic parameters to obtain actual test parameters of the diaphragm sample; and obtaining the porosity delta of the diaphragm sample according to the actual test parameters. According to the diaphragm porosity testing method, the cost is low, the influence on a human body and the environment can be avoided, the safety of the testing process is improved, meanwhile, the non-destructive testing of the diaphragm sample can be realized, and the testing result is more accurate, so that the improvement of the battery performance evaluation accuracy is facilitated, and the testing efficiency is improved. Therefore, the research and development of the lithium battery diaphragm and the quality control in the production process are facilitated.

The utility model provides a battery and a battery pack, and relates to the technical field of batteries. The battery cell is located in the shell, and at least one end of the battery cell in the first direction is provided with a tab; an insulating coating is arranged on the inner side wall of one end, opposite to the tab, of the shell in the circumferential direction; the width of the shell in the first direction is H, the width of the insulating coating in the first direction is h, and h is larger than or equal to 0.05 H and smaller than or equal to 0.2 H. The insulating coating is arranged on the inner side wall of the alignment area of the shell and the tab, so that a good insulating relationship is kept between the tab and the shell, the risk of short circuit caused by falling of insulating glue is reduced, the tab can be arranged closer to the shell, and the space in the shell is further released; by reasonably arranging the distribution area of the insulating coating, the insulating effect between the shell and the tabs can be ensured, and the thickness of the shell in other areas can be reduced, so that the design energy of the battery is increased.

The utility model discloses a vacuum impregnation tank, which belongs to the technical field of vacuum impregnation tanks, and is characterized by comprising a vacuum impregnation tank body, a plurality of connecting pipes, a control box, a door body and a carrier plate, a cleaning mechanism is arranged in the vacuum impregnation tank body, and a first turntable is arranged on the front side of the vacuum impregnation tank body; the top of the vacuum impregnation tank body is fixedly connected with a fixed plate; the cleaning mechanism comprises a threaded rod, a plurality of bristles and a scraping ring, the surface of the scraping ring is in contact with the inner wall of the vacuum impregnation tank body, and the surfaces of the bristles are in contact with the inner wall of the vacuum impregnation tank body. The problems that dust on the surface of an impregnated object can be attached to the inner wall of the vacuum impregnation tank body, the inner wall of the large-size vacuum impregnation tank body is inconvenient to clean, a large amount of manpower needs to be consumed, and the using effect is affected are solved.

The invention belongs to the technical field of batteries, and discloses a battery assembly method and a battery, the method comprises the following steps: S1, installing a protective end plate on a first surface and / or a second surface of a pole group; s2, the outer sides of a plurality of side faces of the pole group are coated with insulating films, and the insulating films and the protection end plates are subjected to hot melting to form pole group units; s3, loading the pole group unit into the cavity of the battery shell; s4, arranging the composite cover plates at the openings in the two sides of the battery shell; s5, welding the composite cover plate and the battery shell; s6, welding the composite pole and the composite shell; and S7, realizing current conduction between the composite pole and the tab. Current conduction is finally achieved through the tabs and the composite pole, so that the influence of other welding procedures on the connection quality of the tabs and the composite pole is avoided, and due to the fact that the tabs stretch out of the battery shell and the composite pole to achieve current conduction, occupation of the internal space of the battery shell is reduced, and the utilization rate of the space is improved.

The invention provides a cylindrical battery, a battery pack and a power utilization device, the cylindrical battery comprises a top cover and an anti-explosion piece, the top cover comprises a base body, a connecting part and an end part, the end part protrudes out of the base body along the axial direction of the cylindrical battery, and the connecting part is connected with the end part and the base body; at least part of the anti-explosion piece and the top cover are arranged in the axial direction. The base body comprises an extension part and a downward pressing part, the downward pressing part is arranged on one side, facing the axis of the cylindrical battery, of the extension part, the downward pressing part faces the anti-explosion piece and protrudes out of the extension part, and the downward pressing part is attached to the anti-explosion piece. According to the cylindrical battery, the downward pressing part is arranged on the top cover of the cylindrical battery, and when the anti-explosion piece is overturned and exploded under the action of air pressure in the battery, the downward pressing part limits the overturning distance of the anti-explosion piece, so that the risk that the explosion pressure of the anti-explosion piece is too large or the anti-explosion piece does not explode is reduced, meanwhile, the deviation of the explosion pressure is reduced, and the safety performance of the cylindrical battery is improved.

The utility model discloses an auxiliary rotating mechanism for metal plate welding, and relates to the technical field of welding assistance. The device comprises a fixing table and a pressing fastener, the pressing fastener for pressing and fixing a sheet metal part is placed at the top of the fixing table, a rotating assembly for driving the fixing table to rotate is arranged at the bottom of the fixing table, and an inner fastening assembly for clamping and fixing the sheet metal part is installed at the bottom of the fixing table in a hinged mode. The pressing fastener is attracted through the electromagnet, so that the pressing fastener is pressed downwards, a sheet metal part between the placing plate and the pressing fastener is pressed and fixed, the pressing fastener is adjusted according to the size of the sheet metal part, and the sliding rod is rotated to drive the T-shaped pressing plate to move and expand to enlarge the size of the pressing fastener. The fixing table is driven by the first motor to rotate, so that the sheet metal part fixed on the fixing table rotates along with the fixing table, the welding position of the sheet metal part is adjusted to be aligned with the welding bracket, and stable welding work is facilitated.

The invention discloses a molecular film type automotive nitrogen and oxygen separation device which comprises a turbocharger, a nitrogen and oxygen separator, a gas inlet valve, a gas outlet valve, a negative pressure pump and an electric control throttling valve. The turbocharger is driven by a turbine in an automobile turbocharger, so that the air is compressed to be conveyed to two paths of the nitrogen and oxygen separation device, the nitrogen and oxygen separation device can separate oxygen from the air, the air with high oxygen content is output, and the air is supplied to an engine for use through the gas outlet valve. The two paths of the nitrogen and oxygen separation device work alternately, when the temperature of the two paths of the nitrogen and oxygen separation device is too high to influence oxygen production efficiency, a main air inlet pipeline is opened to provide air normally by controlling the opening degree of the electric control throttling valve, and thus the phenomena of gas circuit plugging and engine stalling are avoided. According to the automotive nitrogen and oxygen separation device, the two branch paths work alternately, high concentration oxygen can be supplied to the engine continuously so that fuel can burn and act, and the burning utilization rate of the fuel is improved.

The invention belongs to the technical field of magnetic particle imaging, particularly relates to a time sequence magnetic nanoparticle imaging device and method for detecting nerve response activity, and aims to solve the problems that the sensitivity of magnetic particle signal detection is not high, a large coil assembly is needed for achieving high magnetic field intensity, the calculation amount is large, and the calculation mode is complex. According to the device, a signal generator outputs a voltage signal, amplifies the voltage signal and then accesses a selection coil and a driving coil; the two selection coils are arranged in a Maxwell configuration and have the same axis; the driving coils are arranged at intervals of 90 degrees from top to bottom, from left to right and from front to back by taking the FFR as the center; the excitation coil, the receiving coil and the selection coil are coaxial; and the high-pass filter filters the signal received by the receiving coil and imports the signal into a computer through a signal acquisition card for time sequence fMPI image sequence reconstruction. According to the invention, the magnetic particle signal detection sensitivity is improved, the volume of the coil assembly is reduced, the calculation complexity and the calculation amount are simplified, and the magnetic particle imaging robustness is improved.

The invention discloses a phase stirring reverberation chamber, a testing device and a testing method. The phased-array antenna is placed in the reverberation chamber cavity, the to-be-tested device is placed in the testing area in the reverberation chamber cavity, the phased-array antenna is used for carrying out beam scanning to change the state in the reverberation chamber, a field with uniform statistics is formed in the testing area, and the effect of a mechanical stirring device can be achieved in the reverberation chamber; the method which is high in operability and low in cost is provided for electromagnetic compatibility simulation and testing in the reverberation chamber. The testing process does not need a mechanical stirrer, so that the volume of the reverberation chamber cavity can be reduced and the volume of the testing area can be increased. And meanwhile, the device has the characteristics of high speed and easiness in operation, and can be widely applied to the condition of carrying out EMC test on a conventional reverberation chamber.

The invention discloses a large-deformation tunnel surrounding rock-structure rigidity coordination indoor experiment testing structure, and belongs to the technical field of tunnel structure testing. The testing structure comprises a first reaction frame and a second reaction frame, and the two reaction frames are connected through four steel strands and bolts to form a square frame. Yieldable I-shaped steel, a spring, a longitudinal connecting structure, a yielding component, a surrounding rock simulation system and a jack I are sequentially connected and arranged in the square frame in the direction from the reaction frame I to the reaction frame II; the surrounding rock simulation system comprises two square steel plates and a plurality of square surrounding rock simulators clamped between the two square steel plates; four steel strands penetrate through the four corners of the two square steel plates respectively and are fixedly connected with the second reaction frame, and the two ends of the steel strands are fixed through bolts. The test structure provided by the invention can effectively simulate the stress states of the surrounding rock and the support under the rigidity coordination effect of each support structure in the large-deformation tunnel.

The invention relates to the technical field of electronic adhesives, in particular to an n-hexane-containing polyurethane electronic adhesive and a preparation method thereof.The n-hexane-containing polyurethane electronic adhesive is prepared from, by weight, 40-45 parts of polyether polyol, 25-30 parts of polypropylene glycol, 35-40 parts of isocyanate, 1-2 parts of 1, 4-butanediol, 0.02-0.03 part of a catalyst, 6-7 parts of flame-retardant heat-conducting filler, 1.2-1.5 parts of foaming microcapsules and 1-2 parts of a foam stabilizer; by adding the flame-retardant heat-conducting filler and the foaming microcapsule taking normal hexane as a core, the problem that the existing polyurethane electronic glue is poor in heat-conducting property after foaming is solved, and meanwhile, the polyurethane electronic glue also has good flame-retardant property.

The invention relates to a snack food 3D printing device based on double materials and three nozzles and application of the snack food 3D printing device, and belongs to the technical field of food processing and equipment manufacturing. A double-material double-nozzle 3D printing system and a single-nozzle auxiliary gel system are arranged in the printing platform system; the air supply system is connected with the double-material double-nozzle 3D printing system and the single-nozzle auxiliary gel system through pipelines. A conveying system is further arranged in the printing platform system and connected with the physical field auxiliary drying system. According to the preparation method, collaborative technologies such as double-material combined gel, double-nozzle 3D printing, single-nozzle dehydration coagulation acceleration and physical field curing or drying are adopted, the leisure hawthorn product processing problems that a nozzle of single-nozzle 3D printing is prone to blockage, double-nozzle 3D printing is prone to collapse, the printing efficiency is low, and a printed product is simple in shape are solved, the application range of the 3D printed product is widened, and the production cost is reduced. And a technical support is provided for development of specially-shaped haw snacks.