39results about How to "Good noise absorption" patented technology

Provided is a noise-absorbing sheet that is highly effective at absorbing noise from magnetic and/or electric fields, the noise-absorbing effect being effective in wider bandwidths. A noise-absorbing sheet upon which at least two layers are stacked, wherein the noise absorbing sheet is characterized in that a magnetic layer containing a magnetic material and a layer of a noise-absorbing fabric in which a metal is deposited on constituent fibers are layered on said sheet, and the common logarithmic value of the surface resistivity of at least one side of the noise-absorbing fabric is 0 to 6.

The invention provides an acoustic liner mounting device applied to a microphone array method acoustic impedance test system. The acoustic liner mounting device comprises an acoustic liner mounting groove and an acoustic liner which are connected with an acoustic liner experiment test section; ear plates are arranged at the two ends of the top surface of the acoustic liner mounting groove, and areembedded into the acoustic liner experiment test section; steps matched with the acoustic liner are arranged on the ear plates on the two sides, and the acoustic liner is installed in the acoustic liner mounting groove through the steps. the top surface of the acoustic liner mounting groove is flush with the acoustic liner experiment test section, and the airflow surface of the acoustic liner isflush with the airflow surface of the acoustic liner mounting groove. According to the acoustic liner mounting device applied to the microphone array method acoustic impedance test system, the problems of low assembly precision, poor sealing performance and low measurement precision of an existing acoustic liner mounting device are well solved.

The invention provides multifunctional deburring equipment for aluminum alloy production. The multifunctional deburring equipment comprises supporting columns, shock absorbing seats, a working table,a protective curtain structure, a motor, a polishing stone structure, a waste residue box structure, a rolling shaft, a polishing wheel, a supporting block and a rolling drum. The supporting columns are in bolted connection with the four corners of the lower surface of the working table correspondingly, the shock absorbing seats are in bolted connection with the lower ends of the supporting columns, the protective curtain structure is welded to the upper surface of the working table, and the motor is in bolted connection with the upper surface of the supporting block arranged on the left side.According to the multifunctional deburring equipment, collecting of waste residues generated in the deburring process is facilitated through arrangement of a waste residue box, and cyclic utilizationcan be achieved; adsorption of dust generated in the working process is facilitated through arrangement of a suction fan, and cleanliness of the working environment can be maintained; and the situation that burr and sweeps are blocked in a polishing area is facilitated through arrangement of a protective curtain, and the sweeps are prevented from splashing to accidentally injure workers.

The invention belongs to range hood equipment for kitchens, and particularly relates to a range hood noise reduction method and device and a range hood using the device. The noise reduction device comprises a cover part covering a flue duct system of the range hood, wherein the cover part covers the area from the butt joint part between a range hood body and a fan to an air outlet of the fan, a closed cavity is formed among the cover part, the air outlet fan of the range hood and impellers, and a sound absorption material layer is arranged on the inner surface of the cover part. According to the technical scheme, noise in a noise gathering area can be processed, the noise performance index during operation of the range hood is greatly improved, the noise absorption ratio on the clapping part is greatly improved, and good use experience is provided for a user. According to the device, a semi-closed sound absorption structure with a wedge part is located at a neck part of the range hood,namely the air outlet fan position, so that the structure is not in direct contact with a flue duct, the semi-closed sound absorption structure is not easy to cover by oil stain of the range hood, sothat good sound absorption performance can be kept in a long period.

The invention discloses an ultrasonic automatic welding machine with a dust removal function. The ultrasonic automatic welding machine comprises a welding head used for ultrasonic welding of a product to be welded, a servo motor driving mechanism used for driving the welding head, a support made of stainless steel and used for bearing the welding head and a control mechanism, a base and a rack. The base is used for bearing the product to be welded and is provided with a containing cavity for containing the product to be welded; the rack is used for bearing the support and the base; the rack comprises a working table in contact with the base and four supporting legs which are used for supporting the working table and located on the lower portion of the working table; and the rack is of a hollow structure, the hollow supporting legs and the hollow working table are connected into a cavity, one supporting leg is connected with a first water storage tank through a water inlet pipe, and the other supporting leg is connected with a second water storage tank through a water outlet pipe. The ultrasonic automatic welding machine is simple in whole structure, high in practicability, long in service life and easy to use and popularize.

The invention discloses a waterborne colorful rock slice paint added with rice husk silicon nitride based porous ceramic powder. Rice husks are carbonized and then sintered with silicon nitride to obtain porous ceramic powder, the porous ceramic powder is added in paint preparation to enhance the mechanical strength and wear resistance of a coating film, and at the same time porous ceramic has small pore size, high porosity and good sound absorption effect. The colorful rock slice paint imitates the granite pattern, has the advantages of elegant appearance, excellent weather resistance, long service life, and good noise adsorption effect, can be used in walls of cinemas, theaters, subways and the like, the construction is convenient, and the use effect is excellent.

The invention discloses a graphene wave-absorbing film coating and a preparation method thereof. The graphene wave-absorbing film coating comprises the following components by weight: 10-30 parts of polymer resin, 0.05-5 parts of graphene powder, 30-85 parts of iron-silicon-aluminum alloy powder, 30-80 parts of ferrite, 30-80 parts of iron slurry, 1-10 parts of aluminum powder, 1-5 parts of an auxiliary agent, an 2-20 parts of deionized water. The coating is prepared by simply mixing and stirring all the components. The coating takes polymer resin as a carrier, and graphene and a metal wave absorption and shielding material are added. After the coating is applied and dried to form a film, good noise absorption and shielding effects can be achieved.

The invention discloses an ultrasonic welding machine with a temperature shock resistance function. The ultrasonic welding machine comprises a welding head, a servo motor driving mechanism, a support, a base and a rack. The support is made of carbon steel; the base is used for bearing a product and is provided with a containing cavity for containing the product to be welded; the rack is used for bearing the support and the base; the rack comprises a working table in contact with the base and four supporting legs which are used for supporting the working table and located on the lower portion of the working table; and the rack is of a hollow structure, the hollow supporting legs and the hollow working table are connected into a cavity, one supporting leg is connected with a first water storage tank through a water inlet pipe, and the other supporting leg is connected with a second water storage tank through a water outlet pipe. The mounting height of the first water storage tank is larger than that of the second water storage tank, and one side wall of the first water storage tank and one side wall of the second water storage tank are transparent and provided with scales; and the top face of the first water storage tank and the top face of the second water storage tank are each provided with a hand hole. The ultrasonic welding machine is simple in whole structure, high in practicability, long in service life and easy to use and popularize.

The invention discloses a manufacturing process for a lightweight and noise reduction wind power yaw brake. The manufacturing process includes the following steps: S1. processing an external surface of a cylinder body insert member to make the insert member rough; S2. engraving a sandwich material into a predetermined shape by utilizing an engraving machine; S3. coating the surface of the insert member with epoxy glue, and wrapping in a unidirectional basalt fiber prepreg material; S4. paving the sandwich material on the surface of the cylinder body insert member wrapped in the basalt fiber prepreg material; S5. paving the unidirectional basalt fiber prepreg material on the surface of the sandwich material, and then paving the surface twill type basalt fiber prepreg cloth on the surface toform into a preformed body; and S6. placing the preformed body of the step S5 in a mold, and placing in a pressing machine for stitching for 2-5 hours at 120-200 DEG C after mold matching. The manufacturing process adopts a molding process, takes PVC, PET, PMI, PU, and the like as the sandwich material, and basalt fibers are a reinforcement body and are embedded in a cylinder body. The yaw brakewith light weight and a noise absorbing function is prepared by the molding process.

The invention discloses a rubber-plastic composite lock-catch rubber floor and a production method thereof. The floor comprises a surface layer and a bottom layer, wherein the surface layer and the bottom layer are pressed together through environmentally-friendly glue, and the bottom layer is locked through slotting; the surface layer is made of vulcanized rubber, has the advantages of good elasticity, ageing resistance, abrasion resistance and skid resistance and is composed of, by mass, 50-80 parts of styrene butadiene rubber, 10-30 parts of natural rubber, 0-30 parts of nitrile rubber, 4-8parts of zinc oxide, 4-10 parts of stearic acid, 3-6 parts of accelerant, 2-4 parts of anti-ageing agent, 20-40 parts of white carbon black, 30-50 parts of kaolin, 50-80 parts of flame retardant, 2-5parts of sulphur and 2-10 parts of pigment, and the bottom layer is a plastic hard micro-foaming layer and low in price and has the advantages, better than those of vulcanized rubber, of shock absorption, noise absorption and slotting installation; after the surface layer and the bottom layer are bonded through the environmentally-friendly glue, the bottom layer is locked through slotting, so that installation is convenient, simple and easy.

The invention relates to the technical field of materials and particularly relates to a composite silencing material which comprises a silencing block body, wherein the silencing block body comprises a silencing bottom board, a fiber density board, a second-level silencing board, a first-level silencing board and an acoustic board; the fiber density board is arranged at the front end of the silencing bottom board; the second-level silencing board and the first-level silencing board are arranged at the front end of the fiber density board; the acoustic board is arranged at the front end of the first-level silencing board; and the acoustic board is of a mesh structure. In the invention, since a three-level silencing structure is arranged in the silencing block body, a perfect hierarchical silencing effect can be realized; and the composite silencing material has the characteristics of convenience in use, easiness in operation, good practicability, low cost and the like.

The invention discloses laminating equipment for sound-proof laminating cotton. The equipment comprises an input platform, a laminating device and an output platform; the laminating device is installed at an outlet end of the input platform, the laminating device comprises a laminating conveying platform and a guiding device, a film feeding and supplying frame is arranged on the upper portion of the laminating conveying platform, and a plastic film is guided to the film guiding device through the film feeding and supplying frame; by means of the film guiding device, three faces of the sound-proof cotton in the length direction are laminated, by means of cooperation of a film discharging and supplying frame and a glue spraying device, the other face of the sound-proof cotton in the length direction is laminated, the upper film and the lower film are bonded, holes are penetrated in the surfaces of the films, and finally hot melt sealing is conducted. Accordingly, the sound-proof cotton is wrapped by a layer of the plastic film, a certain moisture-proof effect is achieved, the phenomenon that a large amount of batt and cotton flock are generated and fly in use, and then the environment is polluted can be prevented, and by making the holes penetrated in the plastic film, the sound-proof cotton can absorb noise conveniently.

The invention relates to an ecological tree protection plate, a manufacturing process and an ecological tree pool structure, relates to the technical field of landscaping, and solves a problem of poorplant growth caused by poor water permeability and air permeability of the tree protection plate. The ecological tree protection plate comprises a plurality of porous particles and a polymerization part for polymerizing the porous particles into a set shape; the porous particles are formed by pressing or firing an organic material and a mixed adhesive according to a set ratio, and a porous spongehoneycomb structure is formed in an inner portion; and the plurality of porous particles are bonded or pressed with one another. The ecological tree protection plate is good in water permeability andair permeability.

The invention discloses a multifunctional silencer which comprises a cylinder body and a bottom pipe; the bottom of the cylinder body is connected with the top of the bottom pipe. The multifunctionalsilencer further comprises a discharge pipe, the discharge pipe is connected with the top of the cylinder body, a first silencing layer is arranged on the lower middle portion of the cylinder body, and a second silencing layer is arranged on the upper middle portion of the cylinder body. Noise is eliminated through the first silencing layer and the second silencing layer and discharged upwards through the discharging pipe, the noise is greatly reduced, the noise is reduced to be within the standard requirement range, and pollution to the environment is reduced.

The invention provides a compressor soundproof cover. The cover comprises a soundproof cover body, wherein the soundproof cover body comprises a soundproof side plate, and a soundproof top plate, thesoundproof side plate and the soundproof top plate form the soundproof cover body, a wrapping layer is arranged on the inner side of the soundproof cover body, a soundproof foam layer fills the position between the wrapping layer and the soundproof cover body, the wrapping layer is mounted on a fixing ring through an elastic installation rope, the fixing ring is installed on the soundproof cover body through a fixing plate, a fixing seat is arranged at the lower end of the soundproof cover body, the fixing plate is arranged on the outer side of the fixing seat, the fixing ring is arranged on the inner side of the fixing seat, and the two ends of the wrapping layer are installed on the fixing ring on the inner side of the fixing seat. According to the cover, a soundproof layer can make fullcontact with a compressor, noise absorption can be better completed, and in addition, the device is very convenient to assemble and use.

The invention discloses a high-strength and high-safety plastic-wood floor mounting structure. The high-strength and high-safety plastic-wood floor mounting structure is characterized in that boards are arranged on a keel along the length direction of the keel, two sides of each board are respectively provided with an L-shaped first protruding block and an L-shaped second protruding block, and theadjacent first protruding block and second protruding block can be clamped to each other; the inner wall of each square through hole is provided with an irregular shape; a plurality of slots are arranged in the keel, the lower end of each board is provided with a plurality of bolts matched with the slots, and the bolts sequentially penetrate the lateral wall of the keel to be detachably fixed tokeel; the upper surface of each treading layer is provided with a plurality of antiskid protruding strips along the length direction of the corresponding board; the square through hole is arranged inthe middle of each board, the lateral walls of each square through hole are provided with lateral slots, a plate matched with the square through hole can be inserted into the square through hole, andthe lateral walls of the plate is provided with ribs matched with the lateral slots. The mounting structure is convenient in laying, good in noise absorption effect and selectable in mounting strength.

The invention discloses an anti-loosening nut and production equipment. The anti-loosening nut and production equipment comprises a base, a supporting plate and an automatic nut cold header, wherein sleeves are installed at the two ends of the top of the base through bolts; PP buffer films are installed at the inner bottom ends of the sleeves through screws; pistons are arranged in the sleeves; supporting columns are installed at the tops of the pistons through bolts; the supporting plate is welded to the tops of the supporting columns; a protective cover is installed at the top of the supporting plate through screws; a refrigeration box is installed on one side of the protective cover through screws; a microcomputer time control switch is installed on one side of the refrigeration box through screws; semiconductor refrigeration pieces are installed at the two ends of the top of the refrigeration box through installation grooves; and an air inlet is formed between the semiconductor refrigeration pieces. The anti-loosening nut and production equipment is diversified in function, easy to operate, convenient to produce, capable of meeting various requirements in use and suitable for wide application and popularization.

The invention discloses a rotor type compressor noise absorbing device. The device is used for eliminating noise generated during rotor type compressor rotation. The rotor type compressor noise absorbing device comprises a shell (1) used for sleeving a rotor type compressor barrel. A noise absorbing layer (2) is arranged on the inner side wall of the shell (1). The noise absorbing layer is used for absorbing the noise generated during compressor rotation, and the purpose of eliminating noise is achieved. The device is simple in structure, the noise lowering volume for specific frequency at 6.3K and 12.5 K can reach 5 decibels or above, and the total noise lowering volume of the whole machine can reach 5 decibels or above as well.