36results about How to "Play the role of sound absorption" patented technology

The invention discloses wear-resistance rubber for vehicles. The wear-resistance rubber is prepared from the following components in parts by weight: 20-45 parts of neoprene, 15-45 parts of nitrile rubber, 3-6 parts of vulcanizer, 4-9 parts of accelerant, 5-12 parts of an anti-aging agent, 3-15 parts of plasticizer, 6-10 parts of zinc oxide, 5-9 parts of stearic acid, 9-12 parts of glass fiber, 3-7 parts of silicon dioxide, 2-5 parts of sodium urea formaldehyde polymer, 2-5 parts of sulfur and 3-6 parts of carbon black. Compared with the prior art, the wear-resistance rubber has the advantages that the sodium urea formaldehyde polymer and glass fibers are added into rubber to increase the wear resistance, so that the wear resistance of the rubber is greatly improved; and meanwhile, metal wires are contained inside the rubber, and the effect of absorbing sounds can be achieved.

The present invention provides a lightweight composite organic heat preservation and sound insulation prefabricated board for fabricated buildings. The lightweight composite organic heat preservationand sound insulation prefabricated board for the fabricated buildings comprises two organic sound absorption boards, a damping silicone rubber layer, two fiber cement pressure plates, wherein the twoorganic sound absorption boards are made of wood organic matter, white rot fungus hyphae and foaming agents; the damping silicone rubber layer is arranged between the two organic sound absorption boards, and is used for being connected with the organic sound absorption boards and cutting off the transmission of a sound wave; and the two pieces of fiber cement pressure plates are arranged on the outside side of the organic sound absorption boards. According to the lightweight composite organic heat preservation and sound insulation prefabricated board for the fabricated buildings, the wood organic matter is decomposed by wood rot fungi to produce dense pores, the covering effect of wood rot fungi hyphae is used, so that the organic sound absorption boards have excellent sound-absorption effect on the basis of meeting the use requirements of strength characteristic. The invention further provides a preparation method for the lightweight composite organic heat preservation and sound insulation prefabricated board for the fabricated buildings, the preparation process is simple, and the production cycle is short.

The invention discloses cement-based self-leveling mortar and a preparation method thereof. The cement-based self-leveling mortar is prepared from a cement-based self-leveling mortar matrix and a mixture with sound insulation and waterproof functions, wherein the mixture with the sound insulation and waterproof functions comprises a sound absorption material, a waterproof material and a cementingmaterial. According to the invention, three important characteristics including water resistance, sound insulation performance and self-leveling performance are perfectly fused together, and performance conflicts in respective raw material performances are effectively solved, so the self-leveling mortar with excellent performance and sound insulation and water resistance functions is obtained.

The invention discloses an automatic vacuum packaging mechanism for spicy fish. The automatic vacuum packaging mechanism comprises a bottom plate, supporting seats are arranged on the two sides of thetop of the bottom plate, motors are installed on the outer surfaces of the supporting seats, the output ends of the motors are connected with rotating shafts, rotating rollers are arranged on the outer surfaces of the rotating shafts, the outer surfaces of the rotating rollers are in transmission connection through a conveying belt, a lower groove is fixed to the outer surface of the conveying belt, and a sealing groove is formed in the top of the lower groove. During heat sealing, a vacuum pump pumps waste gas into a purifying box, an activated carbon layer and a silver ion filtering layer primarily filter and purify the waste gas, and an ultraviolet lamp irradiates a photocatalyst layer at the moment, so that the photocatalyst layer generates a catalytic effect, and harmful substances in the waste gas are degraded; and a sound absorption layer can play a role in sound absorption during exhausting, and through blocking of all the purification layers and sound absorption of the soundabsorption layer, the exhausting speed of air is reduced, noise during exhausting is reduced, and the working environment is guaranteed.

The invention provides a sound barrier unit plate. The sound barrier unit plate comprises a main body plate layer and a sound absorption plate layer, wherein the main body plate layer and the sound absorption plate layer are integrally connected; the main body plate layer is prepared from active concrete; the sound absorption plate layer is prepared from porous sound absorption concrete. The soundbarrier unit plate provided by the invention has excellent performance of high strength and durability, the compressive strength is 155 to 162MPa, the bending strength is 23 to 25MPa, the anti-seepage grade reaches P10 and the anti-freezing grade reaches F600; the chloride ion penetration resistance of the sound barrier unit plate is measured through an electric flux and the electric conduction amount is less than or equal to 40C; the average sound insulation amount of a sound barrier prepared from the sound barrier unit plate provided by the invention is 50 to 60dB; the sound barrier unit plate provided by the invention has excellent sound absorption performance and good sound insulation effect.

The invention provides a cast-in-situ hollow floor with pores formed by a combined reticular box-shaped component. The cast-in-situ hollow floor comprises a reinforced concrete girder or a profile steel concrete girder, a reinforced concrete ribbed beam, an upper flange plate, a lower flange plate and the combined reticular box-shaped component, wherein the combined reticular box-shaped component comprises a box roof, a box body and a box bottom; the box body and the box bottom are made of reticular bodies; reinforcing ribs of the reticular bodies are vertically placed; each reticular body comprises a reticular plate, the reinforcing rib and a connecting piece, which constitute an integral structure; the lower flange plate is directly compounded with the reticular bodies at the box bottom of the combined reticular box-shaped component. The cast-in-situ hollow floor with the pores formed by the combined reticular box-shaped component adopts the unsealed combined reticular box-shaped component to substitute the existing fully-sealed hollow fillers and solid fillers as the cast-in-situ hollow floor pore-forming technology. The cast-in-situ hollow floor with the pores formed by the combined reticular box-shaped component is beneficial to realization of energy conservation integration of a building and the multifunctional use of hollow floor.

The invention provides a preparation method of a porous network composite material with shielding and sound absorption functions. The preparation method comprises the following steps: (1) carbonizing pre-pressed blocky loofah sponge or phenolic resin-treated blocky loofah sponge in a tubular furnace, and taking the blocky loofah sponge charcoal which is not modified or modified by copper particles as a subsequent material; (2) mixing epoxy resin with trichloromethane, then adding pinecone carbon, adding barium titanate, a curing agent and the like to prepare an epoxy resin-pinecone carbon mixture, firstly paving a layer of epoxy resin-pinecone carbon mixture on the bottom layer of a mold, then paving the blocky loofah sponge carbon, finally paving a layer of epoxy resin-pinecone carbon mixture, and finally, conducting curing in a hot press. The composite material has the advantages that the composite material not only has high conductivity, excellent electromagnetic shielding performance and certain sound absorption performance, but also has good mechanical performance, and reference value is provided for producing home decoration materials with the electromagnetic shielding performance and the sound absorption performance.

The invention belongs to the technical field of submarines, in particular to a self-coupling vessel submersible pump jet propulsion device instead of a propeller. impeller stators are fixedly connected to the inner wall of an outer shell, the other ends of the impeller stators are fixedly connected with a protective sleeve, an intermediate shaft is arranged in the protective sleeve, a rotary sleeve is also sleeved on the intermediate shaft, the rotary sleeve is fixedly connected with the intermediate shaft, impeller rotors are fixedly installed on the outer surface of the rotary sleeve, and the rotary sleeve and the impeller rotors are all located in the outer shell; a casing is also arranged on the outside of the intermediate shaft, a first cavity and a second cavity are arranged betweenthe casing and the intermediate shaft, the first cavity is provided with a first bearing, the second cavity is provided with a second bearing, the inner wall of the casing is fixedly provided with a coil stator, and the outer surface of the intermediate shaft is fixedly provided with a coil rotor, the coil stator and the coil rotor are cooperated.

The invention discloses a frequency-adjustable sound absorption and insulation light composite board which comprises a perforated board, the perforated board is an open box-shaped body provided with a frame, a sound absorption layer, the damping layers, a middle thin board, a sound insulation layer and a sound insulation board are sequentially arranged in the box body from bottom to top in a tightly attached mode, the sound insulation board is fixedly connected with the frame of the perforated board, the damping layers are bonded to the plate face, opposite to the sound insulation layer, of the middle thin plate in a periodic arrangement mode. The sound absorption and insulation light composite board is simple in structure, diversified in form and convenient to manufacture, particularly, the periodic damping structure greatly reduces the surface density and cost of the sound absorption and insulation light composite board compared with a traditional laying full-damping structure, and the resonance and coincidence effect of components are restrained through laying of periodic damping. The periodic arrangement mode of the damping layers realizes sound insulation of noise sources with different frequencies.

The invention belongs to the technical field of chemical substance storage and discloses a ventilation device for storage of high-purity nano alumina. The ventilation device comprises a frame, one end of the frame is fixed together with a protection cover through bolts, a supporting frame is fixed inside the frame, a motor is fixed on the supporting frame, one end of the motor is connected with a fan blade through a rotating shaft, a sound absorbing structure is pasted on the inner surface layer of the frame, a first filtering layer is arranged at the other end of the frame, and a second filtering layer is arranged on one side of the first filtering layer. The first filtering layer can play a role in filtering impurities in air, and the ventilation device is convenient to demount and maintain.

The invention discloses a glue-free self-sinking floor capable of simplifying a process flow. The glue-free self-sinking floor capable of simplifying the process flow comprises an abrasion-resistant layer, a printed color film layer, a base material upper layer, a grid fiber layer, a base material middle layer, a base material lower layer and an anti-slip film layer which are sequentially arrangedfrom top to bottom; the base material upper layer, the base material middle layer and the base material lower layer are each prepared from the following components in percentage by weight: 14.5-15.5%of PVC resin powder, 0.7-0.8% of an environment-friendly calcium zinc stabilizer, 0.7-0.8% of carbon black, 8.5-9.5% of plasticizer and 74-75% of calcium carbonate. The invention further discloses amanufacturing method of the glue-free self-sinking floor. According to the glue-free self-sinking floor capable of simplifying the process flow and the manufacturing method of the glue-free self-sinking floor, the proportion of the filler calcium carbonate can be greatly increased by improving the formula of a base material, so that a unified formula is adopted in the base material upper layer, the base material middle layer and the base material lower layer, the process flow is greatly shortened, and the manufacturing cost is reduced; and in addition, the production cost is further reduced byimproving the composite process.

The invention belongs to the technical field of evaporation concentrators and especially relates to an electromagnetic induction evaporation concentrator. The electromagnetic induction evaporation concentrator comprises an evaporation chamber, a separator, a first heating device and a second heating device, wherein the first heating device and the second heating device both comprise a magnetic conduction circular tube and an induction coil, the induction coil is wound on the magnetic conduction circular tube, and the induction coil is electrically connected with an alternating current induction power supply; the lower portion of the evaporation chamber is sleeved with a magnetic conduction circular tube of the first heating device, a secondary steam outlet of the evaporation chamber is communicated with a steam inlet of the separator, and a pipeline of a steam outlet of the separator is sleeved with the magnetic conduction circular tube of the second heating device. The electromagneticinduction evaporation concentrator has the beneficial effects that a compressor is omitted, and the cost is low; the application range is wider; more energy is saved than MVR; the efficiency is higher; when the organic solvent is evaporated and concentrated, safety and reliability are realized; the problem of noise pollution does not exist, and the silicic acid cotton plays a role in sound absorption; replacement and maintenance are convenient, and the service life is long.

The invention provides a water-based damping coating. Compared with the prior art, the water-based damping coating provided by the invention comprises the microcapsule formaldehyde remover, the microcapsule adopts amino acid, tea polyphenol, an adsorbent and the like as a core material, has excellent formaldehyde removal performance and can remove formaldehyde for a long time, and a beta-cyclodextrin cross-linked polymer is adopted as a wall material and has a hollow cylindrical structure with two open ends, not only can formaldehyde molecules be effectively captured, but also a very excellent sound absorption function is achieved, so that the microcapsule formaldehyde remover has dual functions of formaldehyde removal and sound absorption; the microcapsule formaldehyde remover and other components of the coating cooperate with each other, so that the water-based damping coating has excellent sound insulation performance and long-acting formaldehyde removal performance at the same time, and also has relatively high low-temperature stability and water resistance.

The invention discloses a formaldehyde self-absorption type foam glass insulation board, and belongs to the field of foam glass insulation boards. The formaldehyde self-absorption type foam glass insulation board is characterized in that purification balls are fixedly connected to the interiors of insulation holes inside a foam glass insulation board body, adsorption balls are fixedly connected to the interiors of the purification balls, the interiors of the adsorption balls are made of nano crystalline, activated carbon is evenly distributed on the outer surfaces of bamboo fibers communicating with the outer surfaces, the formaldehyde purification effect can be effectively achieved, and therefore indoor formaldehyde can be conveniently removed, staggered nets are arranged in a staggered mode, drying pieces are fixedly installed at the joints of the staggered nets, light balls with the interior made of silica gel are fixedly installed at the outer ends of the drying pieces, under the action of waterproof pieces, the hydrophobic effect can be effectively achieved, water erosion can be effectively prevented, sound absorption pieces are evenly distributed inside ventilation grooves, binding holes are evenly distributed inside the sound absorption pieces, and the sound insulation effect is greatly enhanced.

The invention relates to the field of core mold vibration machining, in particular to an anti-vibration and vibration-reduction device for a core mold. According to the anti-vibration and vibration-reduction device for the core mold, the structure is simple, and noise and vibration are reduced. The anti-vibration and vibration-reduction device comprises a compartment body with the open top and a base. Inlets are formed in the two sides of the compartment body correspondingly, and a rectangular frame body is arranged on the top face of the bottom of the compartment body. A first separation space is formed between the frame body and the inner wall of the compartment body, and the base is located in the frame body. A second separation space is formed between the frame body and the base, and avertically-arranged first vibration-reduction device is arranged on the bottom face of the base. Sound-absorbing cotton is arranged on the inner wall of the compartment body. The anti-vibration and vibration-reduction device is convenient to machine and reliable in operation.

The invention relates to the field of foaming rubber strips, in particular to a self-adhesive damping foaming rubber strip with a sandwich structure for a vehicle, a preparation method and a damping structure. The invention discloses a self-adhesive damping foaming adhesive tape with a sandwich structure for a vehicle. The self-adhesive damping foaming adhesive tape is prepared from the following components: ethylene propylene diene monomer, an ethylene-vinyl acetate copolymer, an ethylene-acrylate copolymer, acrylic resin, hydrogenated petroleum resin, polyisobutene, mica powder, a foaming agent and a cross-linking agent. The preparation method comprises the following steps: 1) mixing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, acrylic resin, hydrogenated petroleum resin, polyisobutene and mica powder to obtain a rubber intermediate; 2) adding a foaming agent and a cross-linking agent, and mixing to obtain a material to be used; and (3) preparing the to-be-used material into a flaky finished product. The damping structure has the advantages of reducing structural noise and improving the damping effect.

The invention discloses a warehouse sealing door, which is of a two-way opposite opening form. The warehouse sealing door comprises door leaves and a door lock, wherein the door leaves are installed on a door frame through door shafts; the door lock is arranged on the door leaf on one side; the door leaves are divided into a left door leaf and a right door leaf, wherein the left door leaf and theright door leaf independently comprise a sealing door frame and a door sheet arranged in the sealing door frame; the sealing door frame is of a rectangular structure assembled by four frames; and thedoor lock comprises fixed clips symmetrically fixed on the upper end and the lower end of the door frame, and a locking device arranged on the outer side of one door leaf, wherein the locking device comprises a stop lever vertically arranged on the outer side of one door leaf, clamping hoop heads and a locking mechanism arranged on the stop lever, and the clamping hoop heads are independently arranged on two ends of the stop lever and are cooperated with the fixed clips. The warehouse sealing door disclosed by the invention is good in airtightness and resistance to shock, external water vaporsand dust can be effectively prevented from entering a granary, the sealing door is convenient in an opening and closing operation, door opening and closing efficiency is high, and time and labor aresaved.