40results about How to "With damping" patented technology

The invention discloses a rubber reinforced cement functional composite material and a preparation method thereof. The rubber reinforced cement functional composite material is prepared from waste rubber and cement or cement mortars by the following steps of: applying coupling adhesives to surfaces of waste rubber grains and / or powder by using coupling agents; mixing the waste rubber grains and / or powder with the cement or the cement mortars; adding water into the rubber-cement mixed materials for uniform stirring, and performing pavement, pressing, demoulding and maintaining to obtain the functional composite material product having a high mechanical strength and endurance. The composite material has the characteristics of noise reduction, sound isolation, high impact resistance, damping vibration attenuation, wear resistance, static resistance, water resistance and the like, has the advantages of insulation, environmental protection and the like and can be used in the field of functional materials, such as buildings, roads, railways, tunnels, noise barriers and the like. The functional composite material and the method thereof also provide a new way for solving the global problem of 'black pollution' of increasing waste tyres and have a wide application prospect.

The invention belongs to the technical field of composite materials and preparation thereof, and relates to a biomass composite material and a preparation method thereof. The biomass composite material is prepared from bio-based epoxy resin reinforced by plant fiber fabric, wherein on or two of continuous-filament woven fabric of ramie, flax, jute, China-hemp, kenaf or sisal hemp can be adopted as the plant fiber fabric; the fabric is twill, plain or satin fabric, or gridding cloth, and has the surface density of 80-300g / m<2>; the source of biomass epoxy resin is rosin, itaconic acid, gallic acid or epoxy soybean oil; an abietic anhydride-based curing agent is used as the resin; one or two of organic urea derivatives, thiourea derivatives, quaternary ammonium salts, quaternary ammonium phosphate, imidazole salts and acetylacetone metal complexes are used as accelerants; the glass transition temperature of the composite material is adjustable in a range of 80-160 DEG C. A prepreg is prepared by using a solution method or a hot melting method; the prepreg is good in viscosity and long in shelf life, and can be cured at high temperature or medium temperature.

The invention relates to a high-energy consumption self-decoupling magnetorheological damper with damping force decoupling property and failure self-protection function. The damper not only has high energy consumption and output, but also can effectively prevent subsidence of magnetorheological fluid, therefore, the invention is suitable for civil engineering structures. The damper mainly comprises a master cylinder body (6), an auxiliary cylinder body (13), a main piston (8), two auxiliary pistons (23), a piston rod (25), and novel composite-structure energy accumulators (14 and 15). Permanent magnets (9) arranged in the main piston (8) and the two auxiliary pistons (23) can effectively prevent subsidence of magnetorheological fluid, and can still provide corresponding damping force under the condition of power supply failure to enhance the safety of the structure. Magnetic circuit guiding components improve the utilization factor of the magnetic field. A mechanical spring self-decoupling device is mainly operated on the condition that the damper is under low-frequency driving, thereby overcoming the disadvantage of low output of the damper under low-frequency driving.

The invention discloses a urethane foam composite board comprising panels and a composite core plate, wherein the two panels comprise an optically flat damping sheet and porous damping sheets, wherein one surface of the optically flat damping sheet is provided with a non-setting adhesive layer, and the porous damping sheets are arranged in a square or a triangle shape regularly; the composite core plate forms a single-side core plate by splicing one side of a perforated urethane forming board with the porous damping sheets; the single-side core plate and the optically flat damping sheets are foamed, cured and bound to be a multi-layer structure complex by A and B constituent urethane foam composite materials in a forming die, and the urethane foam composite board is obtained after deburring the multi-layer structure complex. The invention has the integrated function of damping, noise reduction, heat and sound insulation and sound absorption, and has simple preparation method and convenient installation and use, thereby being beneficial to popularization and application.

The invention discloses a photovoltaic power generation system virtual synchronous machine control method, a control device, a converter and a system. The present invention connects the energy storage device and the energy storage converter on the DC side where the photovoltaic inverter is connected to the photovoltaic module; collects the voltage and current of the photovoltaic module and executes the maximum power point tracking algorithm to obtain the target value of the DC voltage, according to the The DC voltage target value controls the energy storage converter to operate in a constant output DC voltage mode; the DC power output by the photovoltaic module is multiplied by the conversion efficiency of the photovoltaic inverter, and the SOC of the superimposed energy storage device is optimized to adjust the power component as the photovoltaic inverter. The active power command is used to control the photovoltaic inverter to operate in a virtual synchronous machine mode according to the active power command. The invention only needs a small battery capacity to meet the application requirements, ensures the maximum power generation of the photovoltaic panel, optimizes the availability and life of the battery, and provides power support for the grid.

The invention discloses a door closer capable of self-locking and remote control, comprising a cylinder liner, a connecting pipe, a piston, a connecting rod, a right limit block, a first spring, a pull rod, an upper limit block, a lower limit block, and an electromagnetic switch , the second spring and the rotating shaft; the door closer of the present invention is designed with a self-locking device, so that after the door closer is self-locked, the door closing function becomes invalid, but at the same time, the damping effect is maintained, and the door with the door closer installed can be in any position , when a fire occurs, the fire door can be closed by remote fire control or manually triggering the self-locking device of the door closer, and the status is fed back to the fire control center at the same time; action, the fire door is closed. Secondly, when the door closer is self-locking, the fire door is in any state, which is convenient for people to use. Furthermore, unless the self-locking condition of the door closer is triggered, the door closer will not self-lock. In addition, the door closer still has a certain damping when it is self-locking, and the damping is adjustable.

The invention provides a foundation structure of pile-raft composite seismic-isolation groove under strong earthquake, which comprises multiple pile foundations and multiple seismic-isolation bearings, and a plurality of matrix-arranged pile foundations are arranged in the foundation soil, and the pile top of each pile foundation is fixed The shock-isolation support is installed, and also includes the shock-isolation groove, the shock-isolation groove is installed on the vibration-isolation seat, the inner wall of the shock-isolation groove is laid with a hot-melt rubber layer, and the shock-isolation groove is laid sequentially from bottom to top. Rubber mats, pebble cushions, geogrids, rubber gravel mats, composite geomembranes, epoxy pours, asphalt sand mats and rafts. The invention can effectively attenuate or eliminate earthquake energy, avoid shaking and vibration of superstructures, and reduce disasters caused by earthquakes. The anti-seismic effect is outstanding, the construction is simple, the construction period is short, and the cost is reduced.

The invention discloses a material for a diaphragm of a loudspeaker and a preparation method thereof, belonging to the technical field of electroacoustic products. The material for the diaphragm is prepared by using electrospinning technique; fibroin and carbon nanotubes are blended to form the loudspeaker diaphragm with a micro-nano fibrous net structure; and in post-treatment, an ethanol solution is used for dipping and a polyurethane, polyacrylate or polyvinyl chloride coating is used for finishing, so the diaphragm has certain mechanical strength. According to the invention, supply of raw materials is sufficient; the preparation method is simple and has low energy consumption; the ultra-thin loudspeaker diaphragm is prepared while the strength of the diaphragm is guaranteed; the prepared diaphragm has high specific elasticity, good damping vibration attenuation performance and the characteristics of good sound effect and high fidelity; and the fibroin protein loudspeaker diaphragm has biodegradability, which is beneficial for environmental protection.

The invention relates to a damping type high-magnification rubber expansion film for vehicles and a preparation method of the film. The damping type high-magnification rubber expansion film comprises the following components by weight: 38-42 parts of rubber, 55-57 parts of a damping filler, 2 parts of a vulcanizing agent, 0.2 part of an accelerator, and the balance of one or more foaming agents. A certain proportion of the damping filler and the specific foaming agent are added into an original system, so that the problems that an expansion film has no damping function and is low in rate in the automobile production process are solved, the film has damping performance and high expansion rate on the basis of sound absorption and insulation, the damping vibration attenuation performance is improved, and the thickness of the film is reduced when a same cavity gap is blocked, so that the cost can be reduced to a certain extent.

The invention relates to the technical field of medical devices, and specifically discloses a disposable safety blood collection needle, which at least includes a housing, a needle core, a needle cap, an inner sleeve, a driving spring and a retracting spring. The inner sleeve has a first position and the second position, the driving spring is located between the needle core and the housing and has a first pre-tightened state; the needle core is provided with a pair of opposite first steps facing the side of the needle cap, and the inner sleeve A pair of oppositely disposed first elastic arms are provided, and a second step for abutting against the first step is provided on the first elastic arms; a separation mechanism is provided in the housing. The driving spring of the present invention has multiple functions. In the process of compressing the inner sleeve, due to the need to overcome the elastic force of the driving spring and compress the driving spring, the force required to trigger the ejection of the needle core is greater, which can prevent unconsciousness due to small The excessive force causes the needle core to be falsely triggered; the structural design is ingenious, and the state of whether the needle core is ejected is accurately judged.

The invention relates to a glass fiber net reinforcement part, an exterior wall heat-preservation anti-cracking structure and a construction method of the exterior wall heat-preservation anti-cracking structure. The glass fiber net reinforcement part is of an integral sheet structure formed by two fixing sheets with the same shape and a connecting bridge connected between the two fixing sheets, and a threaded hole penetrating through a screw is formed at the center position of the fixing sheet. In addition, the glass fiber net reinforcement part is designed to be used for reinforcing the connecting strength of an anti-cracking mortar layer and a heat preservation layer, the glass fiber net reinforcement part has a simple structure, has low cost, can be constructed conveniently, and has a good fixing effect, can compensate the strength loss when the binding power between the anti-cracking mortar layer and the heat preservation layer is low, and can ensure the bonding quality and the construction reliability of the follow-up surface layer, the construction operation is simple, the construction difficulty is not increased, the original construction quality and the construction efficiency are not influenced, the using amount of the anti-cracking mortar can be used to a certain extent, the cost is reduced and the glass fiber net reinforcement part can be widely applied to exterior wall construction.

The invention discloses an inverter reactive power control method based on a virtual synchronization mechanism. At present, the inverter reactive power control method is not accurate in control. Whenthe grid voltage fluctuates slightly, the voltage cannot be controlled without any difference; when the grid voltage drops deeply, and the whole reactive power ability of the inverter cannot be played. The reactive power control method is divided into three phases: when it is monitored that the voltage of the grid-connected point is normal, a reactive power control module aims to control the output reactive power of the inverter; when the voltage drop of the grid-connected point is monitored, the reactive power control module superimposes the voltage of the grid-connected point to reduce the voltage drop; and when it is monitored that the voltage of the grid-connected point is further dropped, an LVRT control module controls the inverter to switch to a low voltage ride-through control modeto perform low voltage ride through. The invention can automatically and flexibly control the output reactive power of the inverter, improve the reactive power utilization rate of the inverter, stabilize the grid-connected point voltage, reduce the grid voltage drop degree, and does not affect the low voltage ride through capability of the inverter.

The invention discloses a method for preparing a corn-cob structure morph-genetic ceramic-based composite material, which comprises the following steps of: preparing a corn-cob structure template or a corn-cob structure / precursor composite template; raising the temperature of the corn-cob structure template or the corn-cob structure / precursor composite template to the temperature of between 500 and 2,000 DEG C at the temperature rise speed of 3 to 20 DEG C per minute in the protective atmosphere of vacuum or inert gases; maintaining the temperature for 1 to 10 hours, and cooling to obtain a morph-genetic carbon template or morph-genetic ceramic composite material; after impregnating in the precursor solution or precursor sol, raising the temperature to the temperature of between 1,300 and 2,000 DEG C at the temperature rise speed of 3 to 20 DEG C per minute in the protective atmosphere of vacuum or inert gases; maintaining the temperature for 1 to 10 hours, and performing vacuum carbothermal reduction to obtain the corn-cob structure morph-genetic ceramic-based composite material; or performing liquid-phase siliconizing or gas-phase siliconizing on the morph-genetic carbon template in the protective atmosphere of vacuum or inert gases to obtain the corn-cob structure morph-genetic ceramic-based composite material. The composite material prepared by the invention has the advantages of light weight, shock absorption, sound absorption, high temperature resistance, antioxidation, antifriction and abrasive resistance, load bearing, excellent sensing property, and wide application prospects.

The invention discloses a preparation method of a bionic erosion-resisting composite material enhanced phase based on rose willow. The preparation method comprises the following steps: step1, extracting the rose willow by utilizing ammonia water; step 2, oxidizing the extracted rose willow obtained in the step 1 by utilizing a KMNO solution; step 3, impregnating the rose willow obtained in step 2 by utilizing organic solvent, and rapidly evaporating the organic solvent; step 4, carbonizing the rose willow obtained in step 3; step 5, impregnating the carbonized matter obtained in the step 4 in organic silicon resin solution under the vacuum negative pressure condition; step 6, sintering the carbonized matter impregnated with the organic silicon resin obtained in the step 5 at a high temperature. By adopting the preparation method, while partial chemical components and the porous structural shape of the rose willow are maintained, the indexes of the composite material such as the erosion resistance, rigidness and the like are enhanced; the prepared bionic composite material has the characteristics of vibration absorption, friction reduction and abrasion resistance, and a better choice and various concepts can be provided for bionic erosion-resisting composite material.