363results about How to "Good vibration and noise reduction" patented technology

The invention discloses a water-based sound-proof damping coating and a preparation method thereof. The water-based sound-proof damping coating comprises the following raw materials in part by weight: 15 to 35 parts of polymer emulsion, 35 to 55 parts of inorganic filler, 10 to 20 parts of powdery flame retardant, 2 to 5 parts of auxiliary agent, and 10 to 20 parts of deionized water. The preparation method comprises the following steps of: uniformly mixing the deionized water and a wetting and dispersing agent, and adding part of inorganic filler with stirring at a high speed to prepare inorganic filler water dispersible slurry; and adding the polymer emulsion into the inorganic filler water dispersible slurry with stirring at the high speed, sequentially adding the powdery flame retardant, the rest part of inorganic filler, reinforcing fibers, a mould inhibitor and an antifoaming agent, and finally adding a thickening agent to adjust consistency. The coating of the invention has excellent vibration and noise reduction effect, is mainly used for internal coating of carriage floors, side walls and roofs of vehicles, and can play a good role in inhibiting vibration and reducing noise.

The invention relates to a rail, especially steel rail for railway or electric trolley. Damp rail comprises rail body, on whose non-working surface connector with convex rib or convex-concave structure is set, constraint body connected with rail body, set corresponding to connector, whose inner surface processes convex rib or convex-concave structure and damping body, set between connector and constraint body or among connector, rail body and constraint body, forms labyrinth constraint damping structure, which is set continuously or distantly along length direction of rail body. The rail can decrease shake generated by rail and control the shake and noise of rail in original source, while alleviate availably steel and wheel attrition generated by liberative energy of rail shaking so that there is good damping and noise reduction effect, and operating life of wheel and rail, safety and amenity of train running is largely improved.

The invention discloses an involute gear tooth profile modification method. The method is characterized in that addendum modification is performed on a driving wheel and a driven wheel which are mutually meshed, so that the tooth surface and the addendum of a gear are in transition by a formed modification curve; the modification curve is tangent to a non-modified involute of the tooth surface and the addendum, and the smooth transition of the tooth surface and the smooth transition of the modification curve and the addendum are ensured, so contact deformation and contact stress during the meshing-in and meshing-out of gear teeth are improved. The invention further discloses a tooth profile and the gear which are obtained by the method, and the application of the method. By adopting the method, the smooth transition of the tooth surface and the smooth transition of the modification curve and the addendum are ensured, so that the meshing-in and meshing-out impact of the gear is reduced, the transmission stability is ensured, the vibration and noise reduction of a gear system is benefited, and the service life of the gear is prolonged.

The present invention provides a periodic damping structure for automobile and absorption vibration denoise method thereof. A plurality of damping plates are periodic pasted on a substrate according with certain relative interval, the absorption vibration denoise method is a periodic damping structure pasting method. Parameters need determining includes a damping plates pasting position and a damping plates self physical dimension: length, width, thickness and shape feature, and relative position among damping plates. Length of the damping plates does not go beyond required absorption vibration part dimension, width of the damping plates is 1cm-10cm, thickness of the damping plates is 2-10 times of the substrate thickness, relative interval distance between centres of the damping plates is 10cm-50cm, the damping plates number is larger than or equal to three periodic times. The structure processes innovate to the paste method of damping material for automobile according with phonon crystal band-gap mechanism and can reach preferable vehicle absorption vibration denoise effect. The structure has advantages of simple and reasonable structure, easy to process forming, convenient to install, low cost, long service life and obvious absorption vibration denoise effect.

The invention discloses a steel rail noise reduction damper and a making and mounting method thereof and a vibration absorbing and noise reduction method thereof. The steel rail noise reduction dampercomprises resonance plates, elastic damping layers, a connecting body and a mounting plate; one ends of the mounting plate and the resonance plates are connected to the side surface of the connectingbody; and the elastic damping layers are filled between the resonance plates and the mounting plate and between the two adjacent layers of resonance plates. The other ends of the mounting plate and the resonance plates are all impending to form cantilever beam structures. As the damper is connected to a steel rail, each mass layer / restriction layer of the damper is rigidly connected and elastically connected; through rigid connection, the vibration of the steel rail is rapidly transmitted and transferred to each restriction layer of the damper so that the damper can generate resonance deformation, and therefore, the vibration of the steel rail is absorbed, and the noise of the steel rail is reduced. According to the steel rail noise reduction damper, a better vibration absorbing and noisereduction effect can be realized, a safer and more reliable mounting mode is realized, the dampers with different performance parameters can be mixed and used in a matched manner according to needs,the resonance frequency number can be further increased, and the vibration absorbing and noise reduction frequency band can be expanded.

The invention relates to a wide-temperature-domain high-damping environment-friendly damping material for an electronic product and a preparation method thereof. The damping material is prepared from the following components in percentage by mass: 40-48% of butyl rubber, 4.2-5% of dioctyl sebacate, 16-19% of brominated p-tert-octyl phenolic resin, 0.3-0.6% of an anti-aging agent, 10-25% of carbon black, 2.0-2.5% of zinc oxide, 0.6-0.8% of stearic acid and 12-15% of an antioxidant. The damping material has good damping vibration reduction performance and good mechanical property in a relatively wide temperature range, and has wide application temperature range, high damping factor and good environmental protection performance, conforms to the requirements of European Union environmental directive ROHS, meets the needs in using various electronic equipment, can be popularized to the vibration control and noise control of the instruments and electronic systems on airplanes, ships and vehicles, and has broad application prospect.

The invention discloses a design method and a device for a wedge-mounting vibration-absorbing noise-reducing fastener of a floating rail. The device consists of a high molecular elastic part (2), an inverse V-shaped bracket (3), a wedge block (4), a bottom plate (5), a pitch-adjustment pinch plate (6), an anti-collision liner plate (7), bolts (8), height-adjustment liner plates (10), and coupling liner plates (11). The radian of one end surface of the high molecular elastic part is matched with that of the side surface of a steel rail, while the other end surface of the high molecular elastic part is provided with the inverse V-shaped bracket which is fixed by the wedge block of a groove of the bottom plate. The contact surface that the wedge block contacts the bottom plate is an insection surface, and the contact surface that the wedge block contacts the bottom plate and the inverse V-shaped bracket is an inclined (wedge) surface, thereby ensuring that the rail bottom of the steel rail is in a suspended state and the whole steel rail performs elastic movement under the supporting of the inverse V-shaped bracket. The insulating anti-collision liner plate is arranged to limit the vertical displacement of the steel rail. Both ends of the bottom plate are provided with racetrack type pin holes, and the rail gauge is adjusted by adjusting the installation space between the pitch-adjustment pinch plate and the pin hole of the bottom plate. The height-adjustment liner plates and the coupling liner plates are arranged under the bottom plate according to the height adjustment need and are fixed on an underrail foundation by the bolts.

The invention discloses a long-life pavement structure for a steel bridge deck and a pavement method of the pavement structure. The long-life pavement structure comprises an anti-corrosion layer, a lower adhesive layer, a lower gravel layer, a structural layer, an upper adhesive layer, an upper gravel layer and a wearing layer which are sequentially arranged on the steel bridge deck from bottom to top. The pavement structure has excellent antiskid and waterproof performances, low-temperature cracking resistance, high-temperature rutting resistance, fatigue resistance and water stability, is fine in deformation compatibility with a steel plate and wear-resistant, surface aggregates do not easily fall off, the pavement method of the pavement structure is high in mechanization degree and strong in feasibility, the paved steel bridge deck can be put into operation in a short time, only the wearing layer of the pavement structure is damaged, only regular surface milling and top facing repair are needed, the pavement structure does not need to be structurally reconstructed in a long service life period, maintenance is facilitated, maintenance cost is saved, and the pavement method conforms to the design concept of a long-life pavement and also conforms to the energy conservation and environmental protection concept of modern society.

The invention provides a color coated steel plate with vibration and noise reduction functions and a method for manufacturing the color coated steel plate, and belongs to the technical field of color coated steel plates. The method includes steps of uncoiling a color coated steel coil and cleaning and drying the color coated steel coil after the color coated steel coil is uncoiled; passivating a base plate of the color coated steel plate and drying the passivated base plate to obtain a steel plate to be coated with protective layers; coating a first protective layer on the surface of a first conversion coating of the steel plate to be coated with the protective layers, coating a second protective layer on the surface of a second conversion coating, baking the steel plate, then feeding the steel plate into a water tank to cool down the steel plate, and drying the steel plate by hot air after the steel plate is discharged from the water tank to obtain a steel plate to be subjected to damping treatment; coating vibration and noise reduction damping paint on the surface of the first protective layer of the steel plate to be subjected to damping treatment, and forming a vibration and noise reduction damping layer on the surface of the first protective layer to obtain an aftertreatment steel plate; and feeding the aftertreatment steel plate into a baking oven to bake the aftertreatment steel plate, feeding the aftertreatment steel plate into the water tank to cool down the aftertreatment steel plate after the aftertreatment steel plate is discharged from the baking oven, drying the aftertreatment steel plate by hot air after the aftertreatment steel plate is discharged from the water tank, and rolling the aftertreatment steel plate to obtain a finished product. The color coated steel plate and the method have the advantages that vibration amplitude and vibration are reduced, noise is suppressed, technological steps are simple, and continuous and efficient production can be realized.

The present invention relates to automobile braking system technology, and discloses one kind of brake block of environment friendly composite material and its making process. The present invention features that the brake block is made with nanometer modified resin, composite mineral fiber, organic fiber, mineral fiber, ceramic fiber, artificial graphite, baritite and other materials in certain weight proportion, and through mixing, hot pressing and heat treatment. The brake block has the advantages of no pollution, good damping and noise reducing performance, low cost, long service life, high braking stability, etc.

The invention relates to an organic piezoelectric damping coating which comprises the following components in percentage by mass: 100 parts of resin base stock, 30-200 parts of piezoelectric ceramic powder, 0.5-5 parts of conductive carbon black and 0.5-50 parts of auxiliary agent. A preparation method of the organic piezoelectric damping coating comprises the following steps of: mixing and stirring the piezoelectric ceramic powder, the conductive carbon black and the resin base stock to obtain a mixture, carrying out ultrasonic dispersion on the mixture, then adding the auxiliary agent to ensure that the piezoelectric ceramic powder and the carbon black are uniformly distributed in the resin base stock to form a coating, and polarizing the prepared coating in a direct-current oil bath electric field to obtain the organic piezoelectric damping coating. The organic piezoelectric damping coating has favorable damping performance (tanDelta is more than or equal to 0.1) in a wide temperature range (-50-100DEG C) as a damping coating, can be widely applied to vibration damping and noise reduction of rooms, airplanes, ships, vehicles and various machinery and has remarkable vibration damping and noise reduction effects.

The invention discloses application of micro-capsule self-repair technology in automobile brake shoe made of a composite material. The novel automobile brake shoe made of the composite material which contains self-repair micro-capsules selects dicyclpentadiene (DCPD) microcapsules coated with poly(urea-formaldehyde) as the self-repair micro-capsules, takes an inorganic nano-modified phenolic resin as a matrix and composite mineral fiber (FKF fiber) as main reinforced fiber, is added with a small amount of other fiber-assisted enhanced hybrid reinforcements such as glass fiber and Dutch rock wool at the same time, selects ten materials such as flaky vermiculite, barite, chromite powder, fluorite, calcium carbonate and the like as friction-increasing fillers, selects three materials such as grain graphite and the like as friction-reducing fillers, selects three materials such as cashew nut shell oil friction powder and the like as organic fillers, and is developed according to preferable process conditions. When the brake shoe produces a micro-crack during the friction and wear, the stress concentration of the tip of the crack can cause the rupture of the micro-capsules, a repair agent is released to the surface of the crack by capillary action, and then a polymerization reaction is triggered through a catalyst to ensure that fractured surfaces are adhered together, thereby repairing the surface of the crack.

The invention relates to a metal rubber flexible radials gear, which is characterized in that: a gear ring which is evenly provided with rectangular through holes along the internal diameter and the circumferential direction; a hub which is designed to be separated from the gear ring, the position where is corresponding to the gear ring is provided with a keyway; the gear ring and the hub are ensured to be capable of rotating relatively in a certain range via the matching surface; a key is matched with the keyway of the hub, and is connected with the hub in to a whole by a high intensity bolt; two metal rubber blocks are respectively put into the gear ring holes on the two sides of the key. The metal rubber flexible radials gear is capable of suppressing the high frequency component of noise, and is in particular to have a good effect of dumping vibration and reducing noise. In addition, the invention is capable of proofing oil, resisting high temperature and corrosion like the common metals, therefore the using life of the metal rubber flexible radials gear is far longer than the common flexible radials gear.

The invention relates to a tramcar vibration-absorbing and noise-damping structure which is composed of a first rubber element, a second rubber element and a rail bottom cover. The first rubber element and the second rubber element are positioned on two sides of a grooved steel rail respectively, the rail bottom cover is wrapped at the bottom of the grooved steel rail, barbs extending inwards from the bottom of the grooved steel rail are arranged on two sides of the rail bottom cover to fix the rail bottom cover at the bottom of the grooved steel rail, and the first rubber element and the second rubber element are connected to the barbs on the two sides respectively. The tramcar vibration-absorbing and noise-damping structure is suitable for rail-bound grooved steel rails and applicable to different section forms, vibration-absorbing and noise-damping effect on a tramcar system can be effectively realized, and stray current between the grooved steel rail and concrete can be effectively isolated.

The invention discloses a water-based damping paint for an automobile. The water-based damping paint comprises the following components in percentage by weight: 20-40 percent of water-based acrylic emulsion, 0.3-0.8 percent of a surfactant, 0.1-0.5 percent of a bactericide, 0.1-0.5 percent of an anti-freezing agent, 0.3-0.8 percent of a dispersant, 50-70 percent of fillers, 0.2-0.5 percent of a thickening agent and 0.5-1 percent of water. The invention also provides a preparation method of the water-based damping paint for the automobile. The water-based damping paint for the automobile is used for solving the problems of transportation, construction and environmental protection characteristics of the prior art, has high solid content, wide temperature range and excellent shock absorption and noise reduction effects and also has the advantages of fire resistance, environmental protection, convenient construction and the like.

The invention discloses a broadband noise-reduction steel rail. The composition of the broadband noise-reduction steel rail is as follows: damping material bodies (2) are bonded in rail web recessions at the both sides between the fasteners of the steel rail (1), and the shapes of the damping material bodies (2) are adaptive to the rail web recessions of the steel rail (1); upper metal blocks (3) are embedded on the upper portions in the damping material bodies (2), an inner lower metal block (4) and an outer lower metal block (5) are embedded on the lower portions in the damping material bodies (2), and the opposite surfaces of the inner lower metal block (4) and the outer lower metal block (5) are contacted. The broadband noise-reduction steel rail is wide in vibration and noise reduction band, good in noise-reduction effect, reliable in performance, and long in service life.

The invention aims at providing a local resonance type photonic crystal vibration damping gear. The local resonance type photonic crystal vibration damping gear comprises a gear ring and a wheel hub, local resonance type photonic crystal rods are mounted on an arm of a wheel, two ends of each local resonance type photonic crystal rod are connected with the gear ring and the wheel hub in an interference manner, a welded manner or a screw fastening manner, the local resonance type photonic crystal rods comprise support rods, cladding layers and vibrators, and the cladding layers and the vibrators are mounted on the support rods from inside to outside. The local resonance type photonic crystal vibration damping gear is simple in structure and convenient to manufacture, is enabled to have good damping and noise reducing effects in a low and medium frequency area by converting torsional waves of the gear into bending waves of the support rods, is reliable to use and low in requirements on working environments, and can be used for reducing vibrating noise of a gear box under a low-and-medium-load working condition, improving working environments of workers and the like.

The invention relates to a manual draining device which comprises an outer barrel, an inner barrel and a base. The inner barrel is rotatably nested inside the outer barrel and is driven by a manual mechanism to rotate, the outer barrel is fixed onto the base, a shaft is connected with the bottom of the inner barrel, the other end of the shaft penetrates the bottom of the outer barrel to be connected with the base, and the shaft is at least provided with two supporting shaft sleeves which are respectively arranged on the outer barrel and the base. The manual draining device has the advantages that the manual draining device is simple in structure, the coaxiality and the stability of the shaft can be guaranteed owing to the flexible or elastic shaft sleeves, vibration generated in running procedures can be absorbed and remedied by the aid of flexible or elastic connection, and the manual draining device can stably run in draining procedures and is low in vibration.

The invention discloses a wheel noise reduction method and a multi-layer type wheel noise reduction block. According to the wheel noise reduction method, the multi-layer type wheel noise reduction block is arranged on a wheel for vibration attenuation and noise reduction, a mounting board is arranged in the multi-layer type wheel noise reduction block, a first hole and a second hole are formed inthe two ends of the mounting board correspondingly, and two end portion bolts penetrate through the first hole and the second hole to be screwed onto the wheel; a first outer restraint layer is arranged on the side, close to an axle, of the multi-layer type wheel noise reduction block; a suspension type inner restraint layer is arranged between the mounting board and the first outer restraint layer; a hollow spindle penetrates through the suspension type inner restraint layer, one end of the spindle makes contact with the mounting board, and the other end of the spindle makes contact with thefirst outer restraint layer; the suspension type inner restraint layer is vulcanized and stuck between the mounting board and the first outer restraint layer through a first damping layer; and a middle bolt penetrates through the first outer restraint layer, the spindle and the mounting board and then is screwed into the inner side portion of the circumferential direction of the wheel, and accordingly the middle of the multi-layer type wheel noise reduction block is connected to the wheel.

The invention relates to rail accessories, in particular to a rail fixing device with the function of vertical guidance. The rail fixing device comprises a base disposed on a sleeper. The base is fixedly connected with the sleeper through anchor bolts. The rail fixing device is characterized by further comprising a guide component and a vertical support element. The guide component comprises a guide element and a guide support located on two sides of a rail web of a steel rail. The transverse stiffness of the guide element is at least 120KN / mm. The guide element is tightly contacted with the steel rail at least from the top and bottom of the rail web of the steel rail and transversely limits the steel rail. The guide element is clamped by the guide support. Slide contact surfaces are arranged between the guide element and the guide support and are parallel to the vertical direction of the steel rail, and the guide element and the guide support can slide relative to each other along the vertical direction of the steel rail. The vertical support element is located below the steel rail and has elastic supporting capacity at least in the vertical direction of the steel rail. The guide component on two sides of the rail web is used for guiding, the vertical support element below the steel rail is used for supporting and power consuming, and accordingly stressing stability of the steel rail is improved effectively and the safety is better.

The invention discloses a high polymer composite for an embedded rail system, which comprises the following components by weight percentage: 100% of base material, a filling material, 2-25% of damping liquid, 0-15% of curing agent, an appropriate amount of defoaming agent, an appropriate amount of colorant and an appropriate amount of plasticizer, wherein the base material is polyurethane modified epoxy resin; the filling material comprises the following components by weight percentage: 20-100% of rubber particle, 5-200% of cork powder, 5-100% of slag, 5-60% of expanded perlite and 5-45% of cement expanded perlite. The high polymer composite can meet three-way rigidity requirements of the rail system, has good damping capacity and fatigue resistance, does not crack after three million fatigue tests, is excellent in electrical insulation, green and environment-friendly, and can be recycled and smashed as filling for repeated use.

The invention belongs to the field of vibration and noise reduction, and particularly relates to a constraint damping device capable of increasing the structure damping and achieving a good vibration and noise reduction function. A constraint damping noise reduction plate comprises a connecting plate and a constraint plate, wherein a connecting plate splicing rib and a constraint plate splicing rib are correspondingly arranged at spliced parts of the connecting plate and the constraint plate respectively; at least one of the connecting plate splicing rib and the constraint plate splicing rib is provided with a positioning groove in the mutually matched side face; an elastic isolating strip made of an elastic material is also arranged between the connecting plate splicing rib and the constraint plate splicing rib; the elastic isolating strip is partially embedded into the positioning groove; the connecting plate and the constraint plate are connected through an elastic isolating strip splicing buckle; the elastic isolating strip and a damping layer keep the connecting plate and the constraint plate elastically isolated. The constraint damping noise reduction plate is simple in structure and convenient to use, and can better block own vibration transfer, so as to achieve a better vibration and noise reduction effect.

The invention discloses an axial-flow type maze throttling structure. The axial-flow type maze throttling structure is mainly and technically characterized in that a maze throttling assembly composed of a maze outer sleeve and a maze inner core is arranged in an outer side pressure-bearing body, the maze inner core is arranged in the center position, and the maze outer sleeve wraps the periphery of the maze inner core; a plurality of platy transverse partitions are arranged between the maze outer sleeve and the maze inner core, and a plurality of through holes are distributed in a bottom plate of the maze inner core; the transverse partitions on the maze outer sleeve and the transverse partitions on the maze inner core are sequentially arrayed in a staggered mode, a certain gap is kept between every two adjacent transverse partitions, certain gaps are kept between the inner diameters of transverse partitions on the maze outer sleeve and the outer diameter of the cylindrical face of the maze inner core, certain gaps are kept between the outer diameters of the transverse partitions on the maze inner core and the diameters of the cylindrical holes in the outer sleeve, and therefore a maze passageway which allows fluid to continuously turn by 90 degrees is formed; the maze outer sleeve is made of two same symmetrical half pieces. The axial-flow type maze throttling structure has the advantages that the good throttling and speed reduction effect, the good vibration and noise reduction effect, the good effect of preventing damage caused by washing and the good effect of reducing and eliminating damage caused by gas corrosion are achieved, the axial-flow type maze throttling structure can not be blocked by sundries when running, and the axial-flow type maze throttling structure is simple and compact in structure, small in occupied space, small in part number and low in manufacturing cost.

The invention relates to a method for preparing a decorative interior acoustic insulating material. The method comprises the following steps: (1) putting the nano-carbon black, silicon dioxide sol and an addition agent into a waterborne polyurethane emulsion, and ultrasonically processing to obtain a composite emulsion for use; (2) mixing the expanded vermiculite, magnesite and montmorillonoid with a silane coupling agent, grinding and dispersing for 2-2.5h, mixing the obtained materials with the other remaining materials, sufficiently stirring and performing melt extrusion and granulation in a twin-screw extruder at the temperature of 180-190 DEG C to obtain a modified mother granule; and (3) melting the modified mother granule in a screw extruder, ejecting the fused mass through a melt-blow die head spinneret orifice at the temperature of 230-250 DEG C, uniformly spraying the composite emulsion prepared by the step (1) to a silkscreen after the fiberyarns are collected to form a web on a receiving device, and obtaining the acoustic insulating non-woven material after the composite emulsion is fully cured and dried. By adopting the material, the specific surface area is large, the structure is more compact than that of the traditional non-woven material and the noise reduction effect is obvious.

The invention provides a generalized photonic crystal acoustic shield which comprises a generalized photonic crystal column shell and a generalized photonic crystal semispherical shell connected with the generalized photonic crystal column shell. An annular boss is arranged at the bottom end of the generalized photonic crystal column shell, threaded holes are formed in the annular boss in the circumferential direction, the annular boss is connected with a base, and the generalized photonic crystal column shell and the generalized photonic crystal semispherical shell are at least provided with two cycle components from inside to outside. Each cycle component is composed of a nonmetal layer and a metal layer in sequence from inside to outside, wherein the nonmetal layer and the metal layer are attached to each other. The cycle components are attached mutually. The generalized photonic crystal acoustic shield has the advantages of being high in sound insulation, easy to mount, demount and transport, low in design and manufacturing cost and the like, and the generalized photonic crystal acoustic shield has the good vibration reduction effect on vibration within a band gap range.

The invention belongs to the technical field of vibration and noise reduction of rail transit, in particular to a steel spring vibration isolator which can provide nonlinear elastic bearing capacity.The invention solves the problems of poor vibration control effect and low leveling construction efficiency of the floating ballast bed system under the condition of varying dynamic load. At least oneof that static load support spr and the combined support spring respectively comprises a helical steel spring, A static load bearing spring and a combined bearing spring are arranged in parallel or the combined bearing spring is sleeved outside the static load bearing spring, and the static bearing spring supports the upper shell, at least a part of the combined bearing spring is provided with asolid damping structure, or the lower shell is provided with a damping material, and the combined bearing spring is at least partially arranged in the damping material; The invention has the advantages of simple structure, strong adaptability to dynamic load change and good vibration isolation performance, and can be widely applied to complex vibration isolation engineering where dynamic load is easy to change.

The invention relates to a cord thread winding type reducing arc flexible tube with large displacement compensation capacity. The two ends of an arc flexible tube body are connected with flange joints. The two ends of the arc flexible tube body have different drift diameter sizes, the arc surface of the arc flexible tube body is an axisymmetric and tapered arc surface relative to the central axisof the arc flexible tube body, and the drift diameter size of the flange joints is matched with the drift diameter size of the arc flexible tube body at the connecting end. The arc flexible tube bodyis a single arc tube body arching outward in the radial direction, the circular arc radius of the arc tube body is equal to the circular arc chord length of the arc tube body, and the two ends of thearc tube body are in circular arc transition with the flange joints. The arc flexible tube body sequentially comprises an inner rubber inner, a framework layer and an outer rubber layer from inside tooutside, and the inner rubber layer and the outer rubber layer are rubber layers. The flange joints adopt a three-flange integrated flange joint structure and is integrated with the arc flexible tubebody by vulcanization. The cord thread winding type reducing arc flexible tube with large displacement compensation capacity can be used for reducing flexible connection of a pipeline and has good large displacement compensation capacity and vibration reduction impact resistance capacity.

The invention provides an anti-detonation, fireproof, insulating and noise reduction ocean platform bulkhead structure which comprises a pair of sandwich plates which are arranged in parallel in an up-and-down mode and a shock resistance structure. The shock resistance structure comprises upper trapezoid sets and lower trapezoid sets which are respectively composed of three leaf springs. Damping materials are arranged between the upper trapezoid sets and the lower trapezoid sets. The adjacent upper trapezoid sets and the lower trapezoid sets are connected through damping springs. The upper trapezoid sets and the lower trapezoid sets are filled with first stuffing. Each sandwich plate comprises a pair of upper skin plate and lower plate which are arranged in parallel, and the outer surfaces of the skin plates are coated with insulating layers, wherein a laminboard is arranged between the two skin plates, and the gaps between the laminboard and the skin plates are filled with second stuffing. The anti-detonation, fireproof, insulating and noise reduction ocean platform bulkhead structure has the advantages of being capable of resisting detonation and fire, insulating, capable of reducing noise, simple in structure, capable of facilitating coating construction and quality inspection, short in construction time, suitable for rush repair and the like.

The invention relates to a vibration isolation system with back pressing devices, and belongs to the technical field of vibration reduction of civil engineering structures. The vibration isolation system is used for controlling influences of vibration of machinery equipment on external environments or relieving influences of vibration of the external environments on the machinery equipment. The vibration isolation system comprises a counterweight bench and vibration isolators, the vibration isolators are located between a base and the counterweight bench which is supported on the vibration isolators, elastic supporting elements are arranged in the vibration isolators, and the elastic supporting elements are at least composed of metal helical springs; and the vibration isolation system further comprises the back pressing devices, each back pressing device comprises a back pressing elastic element and a connecting part, one end of each back pressing elastic element acts on the counterweight bench, the other end of each back pressing elastic element acts on the corresponding connecting part, the connecting parts is connected with the base or vibration isolator bases, and the direction of acting force of the back pressing elastic elements on the counterweight bench is opposite to that of supporting force of the elastic supporting elements on the counterweight bench. Compared with the prior art, according to the vibration isolation system with the back pressing devices, the inherent frequency is easy to control, and the vibration isolation effect is better guaranteed.

The invention discloses a drum washing machine provided with damping counterweights. The drum washing machine comprises an outer drum of the washing machine and the counterweights assembled on the outer drum of the washing machine, wherein at least one hollow chamber is formed in each counterweight and is at least partially filled with damping particles. The chambers are formed in the counterweights and filled with the damping particles, during working of the washing machine, the washing machine generates vibration to drive the damping particles in the counterweights to vibrate, and the damping particles consume kinetic energy generated in the working vibration process of the washing machine by collision friction among the particles and between the damping particles and the walls of the hollow chambers, so that the purposes of vibration reduction and noise reduction are achieved. The drum washing machine has good vibration reduction and noise reduction effects, the damping particles have wide damping frequency domain and low generated additional mass, materials are saved, and the washing machine is suitable for popularization and use.