184results about How to "Meet structural requirements" patented technology

The invention discloses an elastic membrane-type low-frequency sound insulation metamaterial structure which comprises two frames and a silicone rubber elastic membrane arranged between the two frames. A plurality of mass blocks are pasted on one side of the silicone rubber elastic membrane, and the mass blocks are separated with one another through the frames. The elastic membrane-type low-frequency sound insulation metamaterial structure solves the problems that a traditional sound insulation material is poor in low-frequency sound insulation performance, large in thickness, heavy in mass and the like and meets the five requirements of low-frequency sound insulation, wherein the five requirements include the low-frequency sound insulation requirement for noise below 500 Hz, the broadband requirement, the requirement for low structural thickness and low weight, and the requirement of easy design processing and low processing difficulty. The elastic membrane-type low-frequency sound insulation metamaterial structure has excellent low-frequency sound insulation performance, can effectively isolate low-frequency noise ranging from 200 Hz to 500 Hz, and can be applied to various carrying tools such as planes, automobiles, trains and ships and various types of building decoration. A brand new sound insulation solution is provided for creating low-noise working and living environments.

The invention discloses an inorganic heat insulation load-bearing concrete, belonging to the technical field of heat preservation load-bearing concrete. The invention aims at solving the problem of providing a concrete which not only can meet the requirements of stress performance of structural components of buildings, but also has good heat preservation property. The adopted scheme comprises: the concrete comprises the components with mix proportion by weight (kg/m<3>): the ratio among composite lightweight doped-aggregate, cement, sand, carpolite, ceramsite, pulverized fuel ash, water and admixture is (6-225): (200-800): (300-700): (500-1600): (150-650): (10-600): (80-400): (0.1-200); wherein the composite lightweight doped-aggregate is one or mixture of more in vitrified micro-bead, vermiculite, expanded perlite and modified expanded perlite, and has the density of (50-180)kg/m<3>. Therefore, the load-bearing concrete can be widely applied to the field of building technology.

The invention discloses a double-flexible-grinding-head magnetorheological polishing device. In the device, a vertical gantry of a bed body and an X-axis are both fixed on a horizontal base; a worktable is fixed on a sliding block of the X-axis; a Y-axis is fixed on a horizontal beam of the vertical gantry; and a first Z-axis and a second Z-axis are arrangedon the Y-axis in parallel. A large flexible grinding head is installed on the first Z-axis; and a small flexible grinding head is arranged on the second Z-axis. A high-flow circulation system connected with the large flexible grinding head and a low-flow circulation system connected with the small flexible grinding head are arranged on a trolley. A control cabinet is arranged at the rear part of the vertical gantry; and a circulation system cabinet and a cleaning system are arranged at the side surface of the vertical gantry. The double-flexible-grinding-head magnetorheological polishing device provided by the invention has the advantages of high accuracy, high rigidness, high stability and high dynamic property. The double-flexible-grinding-head magnetorheological polishing device not only can be used for processing of large-caliber phase elements, but also can be used for high-accuracy processing of large-caliber planar optical elements within the range of full caliber. The optimal matching of the processing efficiency and the processing accuracy can be realized.

The invention relates to a foldable house and an assembling and disassembling method thereof, and belongs to the technical field of moveable house structures. The foldable house comprises a first unit and a second unit, wherein the first unit and the second unit are structurally symmetric and can be integrally assembled with each other to form the foldable house; the first unit and the second unit both comprise bottom plates and mountain wall plates which are hinged to two opposite sides of the bottom plates; side wall plates are arranged between the two mountain wall plates; the bottoms of the side wall plates are hinged to the bottom plates; a top plate is hinged to the tops of the side wall plates; side surface connecting parts and top connecting parts of both the first unit and the second unit are respectively assembled integrally through detachable side connecting members and top connecting members. The foldable house is smart in structural design, small in space, light in weight, rapid in assembly and disassembly, and convenient and rapid in transport, and can be repeatedly assembled and disassembled for use.

The invention provides a low-frequency ultra-wide band gap petal-shaped local resonance acoustic meta-material. The low-frequency ultra-wide band gap petal-shaped local resonance acoustic meta-material comprises a support in the shape of a Chinese character 'tian', elastic films, hemispheres and a plurality of pairs of petal-shaped structures. Square frames periodically extend in x and y directions to form the support in the shape of a Chinese character 'tian'. The elastic films are pasted to the upper parts of the square frames. Corresponding to the square frames, the hemispheres are periodically pasted on the upper parts of the elastic films. The petal-shaped structures are identical in geometrical size, symmetrically surround the peripheries of the hemispheres and are fixed on the elastic films. One square frame, the corresponding elastic film arranged on the upper part of the square frame, the hemisphere and the petal-shaped structures form one cell. The single layer structure made of one kind of cell is adopted for realizing an ultra-wide band gap, the composition or stacking of a plurality of kinds of cells is not needed, the arrangement difficulty of the structure is lowered, and the acoustic stability of the structure is improved; in addition, in a low frequency range, a relative band gap ([delta]f/fc) is as high as 84%, and the proportion of the band gap range in an effect frequency total range is substantially improved.

The invention discloses a turbulence device for a postcombustion chamber of a hybrid rocket engine, which is suitable for ground heat run test of the hybrid rocket engine, is applied to a central single-channel hybrid rocket engine, but is not limited by specific propellant forms. The turbulence device comprises a combustion chamber component, a spoiler component, a spoiler postcombustion chamber component, a sealing and connecting component and a spray pipe component. The spoiler component and the spoiler postcombustion chamber component are combined into a whole so as to be connected with the spray pipe component through the sealing and connecting component and the spoiler postcombustion chamber component. The spoiler component consists of an internal metal spoiler and an external heat insulating structure, and spoiling holes are uniformly distributed in a circle taking the axis of the engine as the center. The spoiler component is used for realizing the turbulence function in gas in the central area, requirements on structural strength and thermal protection of the turbulence device can be satisfied during the working process of the engine, all the components are connected through a stepped fold line mode and O-shaped sealing ring connection, so that the requirements on airtightness and thermal protection are ensured during the working of the engine.

The invention belongs to the field of casting, and particularly relates to high-strength, deformation-resisting and collapsible precoated sand and a preparation technology thereof. The precoated sand and the preparation technology aim to solve the technical problem that a sand core made of precoated sand according to a ratio is low in strength and prone to deformation. The high-strength, deformation-resisting and collapsible precoated sand is composed of crude sand, phenolic resin, curing agents, lubricants and disperser, wherein the crude sand is composed of 20%-30% of nice foundry sand and 70%-80% of quartz sand, the addition quantity of the phenolic resin is 0.9%-1.2% of the mass of the crude sand, the addition quantity of the curing agents is 9%-13% that of the phenolic resin, the addition quantity of the lubricants is 0.1%-0.15% of the mass of the crude sand, and the addition quantity of the disperser is 0.05%-0.4% of the mass of the crude sand. The invention further provides the preparation technology of the precoated sand. The precoated sand has the advantages of high temperature and normal temperature strength, high deformation resistance, good formability, easy collapsibility, good mobility and low gas-forming amount, and completely meets the production technology requirements of an engine with complex structure and high performance.

The present invention relates to a prestress type steel-concrete structure design, and belongs to the field of civil engineering. The prestress type steel-concrete structure using performance design method is characterized by: considering constraint and distribution thereof, wherein the using performance design during structure construction designing comprises calculating deflection of a frame beam under a normal use limit state and carrying out checking computation on a maximum crack width of the frame beam. Considerations of the constraint and the distribution thereof are the entity generated by the internal forces, the constraint causes the influence of the secondary axial force, such that the prestressed frame beam becomes a tension bending member from a flexural member so as to impact deflection and crack width of the prestressed frame beam. With the calculation formula of the design method provided by the present invention, the influence of the secondary axial force is considered, and the prestress type steel-concrete structure design theory is quantitatively established by using a constraint viewpoint.

The invention relates to a flexural bearing capacity designing method for a frame beam adopting a pre-stressed steel reinforced concrete structure and belongs to the field of civil engineering. The flexural bearing capacity designing method for the frame beam adopting the pre-stressed steel reinforced concrete structure is characterized in that when the frame beam adopting the pre-stressed steel reinforced concrete structure is designed, the influence on a flexural bearing capacity and bending moment of a front section of the frame beam caused by lateral restraint is considered; and by adopting a method that the calculation is influenced by the restraint during the structure construction, a new formula for calculating the flexural bearing capacity and the bending moment is provided. According to the design method disclosed by the invention, complex restraint conditions of the pre-stressed steel reinforced concrete structure and the influence on the calculation of the flexural bearing capacity of the front section of the frame beam caused by the restraint and distribution of the pre-stressed steel reinforced concrete structure are fully considered, so that the design of the structure better meets the requirement of an actual structure and better safety performance is obtained.

The invention relates to a prestressed cable foundation design for a large-span space structure, belonging to the field of civil engineering. A prestressed cable foundation design method for the large-span space structure is disclosed by the invention, which changes the current situation that the foundation and upper part of the current large-span space structure are designed separately, establishes a simplified design method for the prestressed concrete foundation tie beam of the large-span space structure in consideration of the interaction between the upper structure and the foundation, fills in the blank in the foundation design of the large-span space structure, and develops an interaction analysis method for the foundation and the upper structure of the large-span space structure. Based on this, the designed structure fully considers the mutual mechanism between the upper structure and the foundation of the large-span space structure in each stage of construction, normal usage and bearing, and also distinguishes the structure analysis model and calculation method in different stages in detail so as to meet the requirement of the practical structure more and have better safety performance.

The invention relates to the field of medical apparatuses and instruments, and particularly relates to a traction fixing belt for a lumbar vertebra. The traction fixing belt for the lumbar vertebra comprises a belt body, wherein a telescopic air bag layer is arranged in the belt body; the belt body consists of PU (polyurethane) leather, pure-cotton cloth and the telescopic air bag layer; the telescopic air bag layer is formed by using a one-step air bag molding technique; after being inflated, at joints of all transverse air passages and all longitudinal air passages of the telescopic air bag layer, all the longitudinal air passages are outwards convex; the whole air bag layer is in an inverted C shape. The structural requirements of the normal physiological curve of a human body are met much more; the belt is attached to a waist more easily; moreover, an air faucet is provided with an inflation connector; the inflation connector is of a copper structure; the conventional rotation deflation is changed through the connector; the push-pressing deflation is used; the deflation is uniform; the belt shrinks stably; the left end and the right end of the belt body are provided with a hook and loop fastener, so that the traction fixing belt for the lumbar vertebra is more convenient and quicker to use and disassemble.

The invention relates to a wind power blade girder cloth paving method, and is used for paving a wind power blade girder. The method comprises the following steps of 1, a wind power blade girder paving device is provided, the device comprises a girder die and guide rail assemblies arranged on two sides of the girder die, and a girder die cavity is formed in the girder die, a moving frame, the moving frame is in sliding connection with the guide rail assemblies through a driving assembly, two paving mechanisms arranged on the movable frame, each paving mechanism comprises a cloth roll supporting mechanism and a cloth guide mechanism, which are used for storing cloth rolls, and the cloth guide mechanism is used for paving the cloth rolls on the cloth roll supporting mechanism in the grinderdie cavity; 2, a first layer is paved through a first laying mechanism; 3, a second layer is paved through a second laying mechanism; and 4, methods of the step 2 and the step 3 are circulated and repeated until the girder paving is completed. The paving method has the advantages that labor is saved, labor intensity is reduced, and working efficiency is improved.

The invention discloses a working method of a floor mopping robot, which belongs to the technical field of cleaning equipment working methods. The floor mopping robot enters a self-cleaning program under the condition that the starting condition of a self-cleaning program is met. In the self-cleaning procedure, the floor mopping robot returns to a base station firstly, then the floor mopping robotcompletes cleaning of a to-be-cleaned wiping surface on a wiping piece on the premise that the electric quantity meets the preset requirement, and the floor mopping robot enables the wiping piece torotate for a period of time to complete dehydration after the wiping piece is cleaned. The purpose of automatic cleaning of the wiping piece can be achieved through the self-cleaning program, a user does not need to manually detach or replace the wiping piece, the use cost of the whole floor mopping robot can be reasonably reduced on the premise that the intelligent degree of the floor mopping robot is improved, and the use experience of the user is improved.

The present invention relates to a concrete load-bearing wall with compound heat-insulating layer. Said load-bearing wall includes wall body and connecting beam. In the wall body of external wall two layers of prefabricated heat-insulating concrete wall bodies are set, said prefabricated heat-insulating concrete wall body is a concrete plate whose external surface is covered with heat-insulating material, every layer of prefabricated heat-insulating concrete wall body is composed of several trough-type or L-shaped prefabricated heat-insulating concrete wall body units. Besides, said invention also provides the concrete assembly and construction method and steps of said compound heat-insulating concrete load-bearing wall.

The invention discloses a high-strength high-temperature-resistance anti-deforming precoated sand and a processing technology thereof, and belongs to the technical field of new materials. The high-strength high-temperature-resistance anti-deforming precoated sand is prepared from the following components of, by weight, 100 parts of roughing sand, 2 to 4 parts of ferroferric oxide, 1.5 to 5.6 partsof antiadhesion sand, 1.8 to 3 parts of anti-veining additive, 1.5 to 5 parts of phenolic resin, 0.5 to 1.5 parts of No.1 enhancer, 0.3 to 1.0 part of No.2 plasticizer, 0.1 to 0.5 part of urotropinesolution, and 1.2 to 2.5 parts of lubricating agent. According to the precoated sand provided by the invention, by improving and optimizing the matching ratio of raw ingredients and a preparation process, the precoated sand has the advantages of high temperature resistance, high deformation resistance, good formability, high strength, good fluidity and low gas content at the same time, fully meetsthe production technology requirements of engines of complicated structures and with high performance, and particularly meets the production technology requirements of small sand cores with complicated shapes and thick walls, so that not only are the high-temperature strength and the collapsibility of the sand core after casting during a nonferrous metal casting process ensured, but also the mechanical property of a casting piece can be further improved.

The invention discloses an ordered double porosity Al203-TiO2 and a preparation method thereof and application thereof; the preparation method comprises the following steps: adding the mixture of an aluminum source and a titanium source into solution A, hydrolyzing, collecting the sedimentation, and roasting at the 200-1000 DEG C temperature for 3-5 hours after drying, thus obtaining the product. The aluminum source is selected from aluminum iso-propoxide or aluminum tri-sec-butoxide; the titanium source is selected from the titaniumethoxide, metatitanic acid isopropyl ester or metatitanic acid N-Butyl acetate; and the solution A is the aqueous solution containing acidic material, the solution of the mixture of the water containing the acidic material cosolvent, the aqueous solution containing the alkaline matterial or the solution of the mixture of the water containing the alkaline material and the cosolvent. The ordered double porosity Al203-TiO2 composite oxides prepared by the method can be used as a catalyst carrier. The ordered double porosity Al203-TiO2 is provided with an ordered macropore-middle pore structure, can meet the structural requirement put forward by different reaction pair catalysts, has simple preparation technology and is apt to the large-scale industrialization production.

The invention relates to a transparent medium antenna which comprises a radiation carrier and a substrate, wherein the radiation carrier is made of graphene; the substrate is a transparent, plastic and viscous substrate; and the radiation carrier is bonded on the substrate. Compared with the prior art, the antenna keeps transparent and ultrathin within a visible spectrum range; the antenna can achieve all functions of a traditional technology antenna; the conductivity of the antenna is much higher than that of a traditional copper antenna; the antenna is convenient to use, and can be mounted in any position inside and outside equipment in a bent shape by the substrate; the wear resistance, the tensile property and the flexibility of the antenna are much higher than those of the traditional copper antenna; and the antenna is convenient to mount, and can meet a stricter structural requirement.

The invention discloses a heat exchange surface coating heat transfer performance testing system which comprises a boiling pool. The boiling pool is connected with a condenser. The boiling pool comprises a shell. The upper end of the shell is connected with an upper cover plate. The lower end of the shell is connected with a lower cover plate. A hole is formed in the lower cover plate. The hole is used for containing a testing workpiece. A bottom pressing plate is arranged below the lower cover plate. A heat insulation silica gel pad and a heat conduction paster are arranged between the lower cover plate and the bottom pressing plate. The testing system further comprises a heater. The heater comprises a direct-current voltage stabilizing power source and a ceramic heating piece. The testing system further comprises a data collection system. The data collecting system comprises a plurality of thermocouples, a temperature patrol instrument and an upper computer. The testing system has the advantages that the application range is wide, the cost performance is high, operation is easy, replacement is easy and convenient, the requirement for machining test workpieces is simple, and the testing accuracy and stability are good.

The invention provides an automatic forming method of a high-speed rail composite material vehicle body. The method comprises the following steps of (1) firstly carrying out partition treatment on a cylindrical section of the vehicle body, and dividing the vehicle body into a multi-cavity carbon fiber composite material structure with different section shapes; (2) carrying out pultrusion molding on the multi-cavity carbon fiber composite material for a high-speed rail through pultrusion equipment; (3) positioning and gluing adjacent high-speed rail vehicle body composite material assemblies through a positioning and clamping tool; (4) carrying out winding through a forming device for winding a reinforcing layer, and completing forming of the reinforcing layer in the blank direction and +/-45-degree direction in the length direction of the high-speed railway vehicle body assemblies ; (5) adopting a shot blasting surface treatment mode; and (6) coating and spraying the surface of the carbon fiber composite material high-speed railway vehicle body. Automatic vehicle body integration and automatic forming are achieved, the number of connecting pieces is greatly reduced, and the reliability, safety and comfort of the vehicle body structure are guaranteed, and automatic forming of the high-speed railway vehicle body is completed.

The invention discloses a gear differential type under-actuated three-joint mechanical finger structure and an operation method thereof. The structure comprises three three-joint fingers, wherein thethree three-joint fingers are arranged at an angle of 120 degrees, each three-joint finger comprises a lower knuckle, a middle knuckle and an upper knuckle, the lower knuckles, the middle knuckles andthe upper knuckles are connected in a meshing mode through gears, joint shafts at the joints of the lower knuckles, the middle knuckles and the upper knuckles are provided with decoupling devices forachieving under-actuation correspondingly, the lower knuckles of the three three-joint fingers are connected with a bevel gear transmission system through gears correspondingly, the bevel gear transmission system is formed by meshing four bevel gears with the sub-taper angle being 30 degrees, the bevel gear transmission system is connected with a stepping motor, and the stepping motor drives thebevel gear transmission system to achieve motion control over the three three-joint fingers. The structure is simple in structure, few in driving elements and capable of being self-adaptive to the surface shape of a grabbed object, and then nondestructive and reliable grabbing is achieved.

An energy-saving cooker is composed of a main body consisting of wall and bottom, and a corrugated metallic plate fixed to the external surface of said bottom for increasing the electromagnetic wave receiving area, so saving electric energy.