245results about How to "No structural damage" patented technology

The invention relates to the field of intelligent magnetic materials and in particular relates to a graphene @Fe3O4 compound water base magnetorheological fluid and a preparation method thereof, solving the problems that existing magnetorheological fluids are easy to settle and the stability and magnetorheological effects of the magnetorheological fluids are difficult to optimize at the same time. The preparation method comprises the following steps: preparing a Fe3O4 water base magnetic fluid with FeCl2.4H2O and FeCl3.6H2O; sequentially adding concentrated sulfuric acid, potassium permanganate and hydrogen peroxide to natural flake graphite and sodium nitrate to prepare graphite oxide; and then carrying out ultrasonic dispersion on home-made graphite oxide to prepare graphene oxide, finally adding a surfactant, the Fe3O4 water base magnetic fluid and a reducing agent to graphene oxide, washing the solution with deionized water until the solution is neutral, and then dispersing graphene @Fe3O4 compound magnetic particles in the deionized water to undergo ultrasonic dispersion, removing the precipitates and taking the supernatant, namely the stable graphene @Fe3O4 compound water base magnetorheological fluid, wherein the magnetic particles are graphene @Fe3O4 and account for 5-35wt% of the whole. The method has the advantages of good stability, low zero field viscosity, high shear strain and wide operating temperature range.

The invention relates to an electric automatic levelling brace for realizing multipoint electric automatic levelling, and aims to provide an electric automatic levelling brace with large lifting weight, rapid and reliable touchdown, good repeatability of levelling precision, high precision, safety, convenience, convenient maintenance and simple electric connection. The electric automatic levelling brace comprises a levelling bearing disc connected with a levelling brace cylinder body and a direct current servo motor with an electric control unit. The top of the levelling brace cylinder body is provided with a transmission chain which is connected with an output shaft of a speed reducer and a leading screw pair for rotary motion; the leading screw pair drives a levelling telescopic cylinder body manufactured with a screw and the levelling bearing disc fixedly connected with the leading screw pair together to do linear lifting motion; a microswitch for feeding back the lifting position to an external control system is arranged on the cylinder wall of the levelling brace cylinder body; a small displacement triggering shaft records the moving position, triggers the microswitch at a triggering point and transfers an electrical signal of the lifting position of the levelling brace to the outside; and the small displacement triggering shaft is connected external control equipment through the microswitch and forms a closed loop levelling system with the servo motor connected with the speed reducer .

The invention discloses a micro-nano fiber grating laser writing method and a micro-nano fiber grating laser writing device. The method comprises the following steps of: tapering normal multi-mode fibers; manufacturing micro-nano fibers; and then taking 193 nm ultraviolet laser as a scribing means. The device comprises a fiber clamp, and an ArF excimer laser, a 45-degree full power reflector, a cylindrical lens and a phase mask plate which are sequentially arranged, wherein the ArF excimer laser is used for emitting 193 nm ultraviolet laser; the tapered fiber is fixed on the fiber clamp; micro-nano fiber regions of the fibers are arranged in front of the phase mask plate in parallel; the 193 nm ultraviolet laser emitted by the ArF excimer laser is reflected through the 45-degree full power reflector and then vertically emitted to the cylindrical lens; and the phase mask plate is arranged in front of the cylindrical lens. According to the method and the device, extra processing for the fibers is not required, the mechanical strength and the toughness of the fibers are kept, the cost is low, the scribing efficiency is high, the bandwidth is narrow, the mode is controllable and the repeatability is high.

The invention provides carbon nanotube conductive paste, a preparation method thereof and a lithium ion battery. The carbon nanotube conductive paste comprises the constituents based on 100 percent bymass: 0.5-10% of conductive functional body, 0.1-5% of dispersing agent and 85-97.5% of solvent, wherein the conductive functional body comprises a rough multi-walled carbon nanotube with a tube diameter being 40-150 nanometers and a fine multi-walled carbon nanotube with a tube diameter being 5-40 nanometers, the difference between the tube diameters of the rough multi-walled carbon nanotube andthe fine multi-walled carbon nanotube is more than or equal to 20 nanometers, the mass ratio of the rough multi-walled carbon nanotube and the fine multi-walled carbon nanotube is (8-2):(2-8), and the tube lengths of the rough multi-walled carbon nanotube and the fine multi-walled carbon nanotube are 30-100 micrometers. The carbon nanotube conductive paste provided by the invention has the characteristics of low settlement, no obvious layering, uniform conductive network and the like, the carbon nantoubes are uniformly dispersed, the volume resistivity is about 50 milliohm per centimeter, andthe viscosity is smaller than 15,000 mPa.s.

The invention discloses a low back pressure saturation method for loess liquidation experiment. The method comprises the following steps: preparing an original or remolded loess test sample; mounting an experiment device; checking the experiment device; preheating the experiment device for more than 20 minutes; mounting the test sample; charging water into a pressure chamber, subsequently adjusting the confining pressure and the back pressure to be zero, zeroing the pore water pressure and the volume change, and finally adjusting the initial shaft pressure to be zero; initializing the confining pressure and the back pressure, and after the confining pressure and the back pressure are stabilized, gradually exerting the confining pressure and the back pressure in sequence step by step. The method adopts the loess test sample which is saturated by using a low back pressure saturation method, the saturability is greater than about 95%, the reproducibility of the experiment is remarkably improved when being compared with that of water head saturation, the analysis on the original loess micro structure before and after the back pressure saturation shows that the horizontal and vertical structure of the test sample is generally complete when the low back pressure saturation method is adopted, the result shows that under the low back pressure condition, the saturability can be improved by using the method, the structure of the test sample is not damaged, and the method has the characteristics of high saturability, relatively high control precision and the like.

The invention discloses a basin-type rubber bridge bearing replacing method, which comprises: arranging a jack by side of a bearing, raising the box girder, cutting the connection between the bearing and a column and a box girder, replacing the bearing. The invention has the advantages that the disabled bearing is replaced by the invention method does not damage the bridge structure, improves the bridge traffic conditions, eliminates the potential dangers of the bridge, and has low cost and short time of the replacement.

The invention relates to a method for detecting the degradation condition of mulching film source micro-plastics in soil. The method comprises the steps of: taking soil to be detected, screening micro-plastics having relatively large particle diameter after drying, then, adding into saturated NaCl solution, sufficiently oscillating, so that the micro-plastics suspend in the solution, standing, sothat suspension liquid and soil solids are layered, then, pouring the suspension liquid, performing suction filtration, cleaning the filtered micro-plastics by using absolute ethyl alcohol, and then,drying by putting in a vacuum drying box, so that a sample to be detected is obtained; and, taking the sample to be detected, and analyzing change of the micro-plastic carbon-based index, the crystallization degree and the sample surface morphology by using a Fourier infrared spectrometer and a scanning electron microscope, so that the degradation condition is evaluated. The method in the invention is simple, convenient and rapid; the degradation change condition of the mulching film source micro-plastics in the soil can be directly seen; furthermore, the micro-plastic structure does not needto be destroyed; and the ecological risk of the soil after the mulching film source micro-plastics are degraded can be further evaluated through the method in the invention.

The invention discloses a rapeseed substrate block seedling transplanting device. The device comprises a rack, a driving rotating shaft, a chain wheel, multiple seedling delivery side plates, a seedling pushing device, multiple main seedling delivery plates, multiple seedling separating devices and multiple seedling taking devices, wherein the chain wheel is arranged on the driving rotating shaft,the seedling delivery side plates are uniformly arranged on the rack side by side, the seedling pushing device is located above the seedling delivery side plates, the main seedling delivery plates are connected with the driving rotating shaft separately, the seedling taking devices are connected with a seedling taking shaft separately, the number of the seedling delivery side plates, the number of the main seedling delivery plates, the number of the seedling separating devices and the number of the seedling taking devices are all equal, and the seedling delivery side plates, the main seedlingdelivery plates, the seedling separating devices and the seedling taking devices are arranged correspondingly one to one; the end side of an opening of each seedling delivery side plate is in butt joint with the corresponding main seedling delivery plate, each seedling separating device is arranged on the tail end of the corresponding main seedling delivery plate, and each seedling taking deviceis located above the corresponding seedling separating device. The rapeseed substrate block seedling transplanting device has the advantages that seedling delivery, seedling separating and seedling taking planting of rapeseed substrate block seedlings can be completed at a time, the device is suitable for seedling raising and transplanting of cube substrate blocks of different sizes in a certain range, bowl bodies are not consumed during seedling raising, and the work cost can be saved.

A delayed consolidation method for foundation or road bed features that a ring of vertical impervious curtain wall is built surrounding the foundation and an horizontal impervious linked with said virtical impervious curtain wall in sealing form is built up under building. Its advantages are low cost, short period, and damage to foundation earth.

The present invention discloses a dopamine-based modified polymer film and a preparation method thereof, and belongs to the field of environmental materials. The dopamine-modified polymer film preparation method comprises: (1) self-polymerizing dopamine on the surface of polymer powder, and adhering the generated poly dopamine function layer onto the surface of the polymer powder; and (2) preparing the film from the dopamine-modified polymer powder by using a solution phase conversion film forming method. According to the present invention, the film forming material is modified with dopamine and then the film is formed, such that the film structure can be controlled flexibly and conveniently according to the use need; the prepared film has good hydrophilicity and good pollution resistance, and can be further subjected to functionalized modification; the modification does not damage the film material, and does not sacrifice the physical and chemical properties of the original film; the method has advantages of simple process, good effect, energy saving and environmental protection; and the prepared film has good hydrophilicity and good pollution resistance, and is suitable for various film separation fields.

The invention belongs to the field of environmental protection technology and denitration catalysis, and particularly relates to a reutilization method of an inactivated SCR denitration catalyst. Thereutilization method specifically comprises the following steps: soot blowing, cleaning by a cleanout fluid, reductive acid leaching, auxiliary agent loading, active component loading and the like. Bytaking the integral inactivated SCR denitration catalyst as a raw material, the low-temperature SCR denitration catalyst is obtained by carrying out in situ regeneration. The regeneration catalyst has very high catalytic activity and sulfur poisoning resistance in a temperature range of 150-300 DEG C.

The invention discloses a method used for determining the evapotranspiration of crops on site, belonging to the field of agricultural science and technology. The method comprises the steps as follows: data on soil water potential and soil volumetric moisture content of more than 5 layers of soil layers with different depths is measured on site in real time; wherein, at least one layer is below the root layer of the crops; a plurality of data pairs on unsaturated hydraulic conductivity-volume water content of all soil layers above the zero flux plane below the root layer are obtained when the zero flux plane exists below the root layer of the crops, thus obtaining the mathematical relationship of unsaturated hydraulic conductivity-volume water content of all soil layers, therefore, the water flux of all soil layers below the root layer can be obtained, thus determining the evapotranspiration by a water balance method. The method of the invention can be used for determining the evapotranspiration of the crops on site, destroys no soils, is convenient and precise, and can work out the evapotranspiration of the crops at the time interval without observing the zero flux.

The invention provides a polyvinyl chloride mixture, a door seal, a refrigerating device and a manufacturing method. The polyvinyl chloride mixture comprises the following components in percentage by mass: 40-50% of polyvinyl chloride resin powder, 25-35% of a plasticizer, 2-5% of an auxiliary plasticizer, 3-10% of elastomer, 1.5-2.5% of a thermal stabilizer, 10-20% of inorganic filler, 1-2% of a lubricant and 0.5-1% of an anti-mildew antibacterial agent. Through the technical scheme, adhesion and migration of the door seal between a liner HIPS or ABS and a PCM side plate and a spray plate are effectively improved, resilience and permanent compression deformation of the door seal are improved, twisting, dropping and other problems of the door seal are effectively improved, and durability of the door seal is obviously improved; the door seal has an anti-mildew antibacterial property, so that the quality of the door seal is improved and influence of mildewing of the door seal on a human body is avoided.

The invention relates to fabricated wall temporary connecting and fixing equipment. The fabricated wall temporary connecting and fixing equipment comprises a base plate, a flat plate, supporting devices, clamping devices and pushing devices. The flat plate is mounted on the base plate. The supporting devices are symmetrically mounted at the left and right ends of the base plate. The clamping devices are mounted on the corresponding supporting devices. The pushing devices are mounted on the flat plate. Through the fabricated wall temporary connecting and fixing equipment, the following problemsexisting during fabrication of an existing fabricated wall can be solved. The problems are shown as follows: when most of fabricated walls are assembled in place and joint construction is not completed, the fabricated walls can be placed stably and the occurrence possibility of accidents is greatly improved; and when traditional reinforcing devices are adopted, threaded holes need to be formed inthe walls, steel plates are mounted to the threaded holes of the walls through threaded rods, the upper ends of supporting rods are welded to the steel plates, the lower ends of the supporting rods are embedded on the ground, a lot of time and labor are wasted, and structural damage is caused to the fabricated walls. The fabricated wall temporary connecting and fixing equipment has the advantagesof being good in pushing and reinforcing effect, high in working efficiency and the like.

The invention discloses modified polysulfone powder based on dopamine and a preparation method of a dopamine-modified polysulfone membrane. The preparation method of the dopamine-modified polysulfone powder comprises the steps that 1, autopolymerization of dopamine on the surface of polysulfone powder is conducted, and a generated polydopamine functional layer is adhered to the surface of the polysulfone powder; 2, the dopamine-modified polysulfone powder is prepared into the membrane through a solution phase-inversion membrane-forming method. The preparation method has the advantages that dopamine is adopted to modify membrane-forming material polysulfone, and then membrane forming is conducted so that the membrane structure can be flexibly and conveniently regulated and controlled according to the use demand; the prepared polysulfone membrane has the good hydrophilic property and anti-fouling performance and can be further subjected to functional modification; the membrane material is not damaged during modification, the physical and chemical properties of an original membrane are not sacrificed, the method is simple, the effect is good, energy conservation and environment friendliness are achieved, and the method is suitable for industrial production and application.

The invention discloses a preparation method of a proton exchange membrane fuel cell catalyst. The preparation method is characterized by comprising the following steps of: refluxing a sp2-hybridized carbon nanomaterial through concentrated HNO3, washing, drying in vacuum, calcining and purifying; performing plasma surface functionalization on the purified sp2-hybridized carbon nanomaterial by plasma discharge; and adding the sp2-hybridized carbon nanomaterial into reducer-containing solution and metal salt precursor solution in a strongly alkaline inert atmosphere for a reduction reaction so as to obtain the proton exchange membrane fuel cell catalyst. The preparation method has the advantages that: high-density uniformly-distributed surface functional groups can be produced on the surface of the carbon nanomaterial, the structure of the carbon nanomaterial is prevented from being damaged, migration of electrons between metal nanoparticles and the sp2-hybridized carbon nanomaterial is prevented from being obstructed and high electro-catalysis performance is kept.

The invention discloses a piezoelectric type decoupling micro-vibration measurement system. The piezoelectric type decoupling micro-vibration measurement system comprises a base plate, three side plates, eight independent shearing type piezoelectric type sensors, a wiring plate, a loading plate and a data collecting and processing system. The eight shearing type piezoelectric type sensors are coincident and simple in structure, are independently assembled, are located between the base plate and the loading plate and are vertically connected through bolts, each sensor can measure a transverse force and a longitudinal force, and three decoupling dynamic forces and three decoupling dynamic force moments of a disturbance vibration source in the center of the loading plate are measured by reasonably combining the eight sensors; a wire led out from the sensor combination is connected to a corresponding port in the wiring plate, and the port is connected with the data collecting and processing system through a wire. By means of the piezoelectric type decoupling micro-vibration measurement system, the vibration forces and the vibration force moments of the micro disturbance vibration source can be directly measured accurately, calibrating is simple, the measured frequency range is accurate, and the measurement reliability is high.

The invention belongs to the technical field of 3D printing and after-treatment and in particular discloses a method for eliminating a 3D printing wax type supporting material. The method comprises the following steps of uniformly stirring an alcohols organic solvent, an alcohols polymer organic solvent and plant oil according to a certain ratio to prepare a mixed organic solvent; and at a certain temperature, placing a 3D printing sample into the mixed organic solvent, soaking, after removing the wax type supporting material, taking out the 3D printing sample, repeatedly washing with water, and drying to obtain a final wax-free 3D printing sample. The method can directly dissolve residual wax in the sample, ensures the basic requirement for completely eliminating a wax type material, has low requirements for environment, low cost and high efficiency, is simple in operation, does not influence the size, the structure, the surface performance and the like of a resin forming material and is suitable for elimination after-treatment processes aiming at the wax type materials in laboratories or factories and in particular for after-treatment links for 3D printing employing the wax type supporting material.

The invention provides a small-size portable high-accuracy disturbance measuring system. The system consists of an upper installation part, a lower installation part, eight piezoelectric force sensors (four sensors are arranged along a vertical direction and the other four sensors are arranged along a horizontal direction) and a data acquiring and processing system, wherein the upper and lower installation parts are connected through a screw to form a whole; and a vertical pressure sensor and a transverse pressure sensor are arranged in an integral part consisting of the upper and lower installation parts and drive washers to compress the sensors through bolts respectively. The eight sensors are arranged reasonably so that three dynamic forces and three dynamic bending moments of a disturbance source can be measured. The disturbance source is arranged outside the system according to a specific requirement. The piezoelectric sensors are connected with the data acquiring and processing system through leads. The measuring system can accurately measure the disturbing force of a tiny disturbance source and has high measuring reliability. The system has a small size per se, light weight and capability of testing the disturbing force under various environments so that the range of application is expanded to a large extent.

The invention relates to a nickel-doped and carbon/silica-coated synergistically modified cobalt lithium fluorophosphates cathode material and a preparation method thereof. The preparation method comprises the following steps: (1) respectively adding a lithium source, a cobalt source, a fluorine source and a nickel source compound into deionized water in a certain stoichiometric ratio, stirring, adding a certain amount of a phosphate source compound into the solution, further stirring, transferring into a high pressure reaction kettle, airtightly heating, reacting, then naturally cooling, taking out, and drying, so that a precursor is obtained; (2) mixing the obtained precursor and a carbon source compound, grinding, and calcining for two stages in inert atmosphere, so that a carbon-coatednickel-doped Li2Co1-xNixPO4F/C material is obtained; and (3) weighing a certain amount of silica, putting into a breaker, adding deionized water, carrying out ultrasonic treatment, then adding the Li2Co1-xNixPO4F/C material, stirring, drying, and grinding, so that the Li2Co1-xNixPO4F/C+SiO2 target material is obtained. The prepared material is uniform in particles and good in crystallinity and has relatively high specific capacity and good cycle performance; and meanwhile, the synthetic process is simple and easy, and the production cost is low.

The invention discloses rotating equipment for civil engine hole detection. The rotating equipment comprises a support component, an XYZ axis adjusting mechanism, a driving mechanism, a rotating rackand a telescopic support component, wherein two ends of the support component are supported by an inner ring in the front end of an engine blade; the XYZ axis adjusting mechanism is arranged in the middle of the support component; the driving mechanism is arranged on the XYZ axis adjusting mechanism; the rotating rack is connected with a front corn of an engine fan; one end of the telescopic support component is connected with the support component; and the other end of the telescopic support component is propped against the inner ring. By adopting the rotating equipment disclosed by the invention, conventional manual operation for rotating an engine blade can be replaced, the whole hole detection process can be carried out by one operator instead two operators, and the labor can be thus saved; the engine blade can be controlled by a servo motor to rotate positively and negatively at a uniform speed, then convenience can be brought to hole detection operators to observe the engine blade, and the hole detection precision can be improved; and in addition, the rotating equipment has the advantages of being simple to operate, convenient to carry over, rapid to mount/dismount, and the like.

The invention discloses a lead-acid storage battery vulcanization repair process, which is characterized by comprising the following steps: performing battery vulcanization repair by steps of storage battery preparation, water and power supply, primary discharge test, assembly, repair solution making, repair, secondary discharge test, delivery and clearing up. The lead-acid storage battery vulcanization repair process of the invention can effective promote the softening and decomposition of lead sulfate crystals and restore the capacity of the lead-acid storage battery considerably. The process can restore over 96 percent of used storage batteries and make the capacity of the storage batteries close to the rated capacity of the storage batteries and the service life of the storage batteries to design service life. The repair process avoids causing damages to the internal physical and electrochemical structures of the lead-acid storage battery, reduces the environmental pollution caused by waste storage batteries, saves resources, energy resources and is low in carbon; due to high maneuverability, the process is easy to promote; and with high efficiency and low cost, the process isexpected to bring great economic benefits to the society.

The invention discloses a vacuum nano-electroplating waterproof breathable fabric and a production process thereof. The fabric comprises a fabric base material, a high-density waterproof layer and a nano-water-repellent plating layer, the high-density waterproof layer is combined with the surface of the fabric base material by a hot-pressing and compounding mode, a nano-water-repellent plating layer film is deposited on the high-density waterproof layer by a vacuum nano-film coating mode, and the surface of the nano-water-repellent plating layer can have 10-15 dynes. The fabric is treated by the aid of a vacuum nano-film coating technique, so that the fabric has better waterproof and hydrophobic functions, original characteristics (heat retention, breathability, comfort, portability and the like) of the fabric can be effectively kept, nano-scale film coating is implemented, dosage of materials is less, the fabric can be prepared from low-cost materials and has the advantages of low cost, adverse by-products are omitted in the whole treatment process, the fabric is green and environmentally friendly, and film layers are stable and not easy to decompose.

The invention discloses a flange cover plate overturning device for syringe fixation. The device comprises a body, a friction piece capable of rotating relative to the body, a fixing frame connected with the body in the hinging manner and used for accommodating a syringe and a protective sleeve arranged on the outer side of the syringe in a sleeving manner, wherein the friction piece comprises a cambered part, the circle center of the cambered part is concentric with the circle center of the body, and the body rotates relative to the fixing frame in a first direction, and is connected in a hinging manner in a second direction. According to the device, the body is ensured to rotate only 90 degrees relative to the fixing frame without separation, and the body is also prevented from being structurally damaged due to rapid falling under the action of gravity when being separated from the fixing frame.