30results about How to "Good sound absorption and noise reduction" patented technology

The invention discloses a high-power container type diesel generating set. The high-power container type diesel generating set comprises an auxiliary container, a power container and a connecting metal flexible pipe which is arranged between the auxiliary container and the power container, wherein the power container comprises a machine room and an electric appliance room, the machine room is internally provided with a diesel engine, a main generator, a starting motor, a storage battery and a charger, and the electric appliance room is internally provided with a high-voltage cabinet, a grounding cabinet and a control cabinet; the top part of the auxiliary container is in an open type, and a box door is in a shutter type; and the connecting metal flexible pipe comprises large-caliber steel wire braiding flexible pipes and small-caliber steel wire braiding flexible pipes, two large-caliber steel wire braiding flexible pipes are connected by adopting a movable flange, and two small-caliber steel wire braiding flexible pipes are connected by adopting a quick-change connector. According to the high-power container type diesel generating set disclosed by the invention, the generator and an auxiliary unit are respectively arranged in the two box bodies, the two box bodies are connected by adopting the steel wire braiding flexible pipes, and thus the high-power container type diesel generating set can effectively adapt to places with large environmental temperature difference and strong sandstorm and has the characteristics of noise reduction, shock absorption, easiness in disassembling and hoisting and the like.

The invention relates to the preparation method of an acupuncturing 3D sound-absorbing body. The preparation method comprises the following steps:(a) weighting the first polyester staple fiber and fiber A respectively; (b) then entering into the cotton rolling equipment to carry out opening and mixing;(c) the fiber after processed by the cotton rolling equipment entering into a cotton mixing machine for further uniform mixing;(d) entering into the combing equipment and forming a fiber network after opening; (e) the fiber network entering into a stacking device for stacking;(f) forming cellucotton after first acupuncturing of the stacked fiber network; (g) placing a cotton blanket on the cellucotton, then carrying out the second acupuncturing to form into a acupuncturing cotton blanket;(h) cutting the acupuncturing cotton blanket into acupuncturing cotton blanket blocks by the cutting equipment; (i) enabling the acupuncturing cotton blanket blocks to enter into the heat setting equipment for heat setting; and(j) squeezing the acupuncturing cotton blanket blocks by a mould, so as to obtain the acupuncturing 3D sound-absorbing body. The 3D sound-absorbing body provided by the invention has the effects of sound absorption, noise reduction and decoration.

The invention discloses a dry method automobile acoustic absorption roof. The roof is prepared from a roof blank plate through postprocessing forming. The roof blank plate is composed of five layers of plate structures, wherein the first plate layer is prepared from glass fibers and polyethylene adhesive powder with the weight ratio being 2-2.5 to 1; the second plate layer is made from modified expanded polystyrene; the third plate layer is prepared from fiberglass modified polyethylene adhesive powder; the fourth plate layer is prepared from modified expanded polystyrene; and the fifth plate layer is prepared through glass fibers and polyethylene adhesive powder with the weight ratio being 2-2.5 to 1. Through the dry method automobile acoustic absorption roof, the weight of the dry method roof is lowered, the product lightweight is achieved, and the NVH acoustic absorption performance of the roof can be improved.

The invention provides a multi-functional short-staple rope twisting machine. The multi-functional short-staple rope twisting machine comprises anti-slip mats, left supporting legs, right supporting legs, a machine base, a U-shaped supporting frame, a rope twisting motor, a rotary disc, a linear sliding rail, U-shaped sliders, winged screws, rope twisting hooks, a rope taking and wheel replacing structure, a structure for coiling a rope after rope twisting, a rope twisting length measurement determining rail structure and an anti-overflow shield structure, wherein the anti-slip mats are transversely glued to the lower surfaces of the horizontal sections on the lower portions of the left supporting legs and the lower surfaces of the horizontal sections on the lower portions of the right supporting legs respectively. Due to the arrangement of a fixing rod, a movable sleeve, a fixing hook and a square-head bolt, the moving position of the fixing hook is easily adjusted according to the horizontal requirements of rope twisting, and it can be ensured that rope twisting work is smoothly conducted; due to the arrangement of an adjusting slider, a stainless steel sliding rail, a measurement ruler and an adjusting bolt, the rope twisting length is easily ensured, and the rope twisting length consistency can be ensured.

The invention relates to a degradable vehicle interior decoration composite material and a processing process thereof, and provides a degradable vehicle interior decoration composite material having characteristics of high strength, beautiful outlook and low cost and meeting vehicle interior decoration member base requirements, and a processing process thereof, wherein the degradable vehicle interior decoration composite material comprises, by mass, 35-45% of polylactic acid fibers and 55-65% of natural fibers, wherein the natural fibers are fibrilia, the fibrilia is one or compounding of more than any two selected from hemp fibers, jute fibers, flax fibers and / or sisal fibers, the natural fibers further comprise bamboo fibers, a ratio of the fibrilia to the bamboo fibers is 1:0.1-0.5, and the diameter of the bamboo fibers is 0.1-0.9 mm. According to the present invention, the degradable vehicle interior decoration composite material has advantages of green environmental protection raw materials, light weight, no toxicity, no odor, complete biodegradation and recycling, and the mechanical property, the thermal stability, the combustion characteristics, the organic matter volatility, the odor and other indicators of the product completely meet the technical requirements of the vehicle interior decoration material.

The invention provides a water-based damping coating as well as a preparation method and an application thereof. The water-based damping coating is prepared from the following components in parts by weight: 30 to 60 parts of water-based emulsion, 10 to 20 parts of basalt fiber, 30 to 60 parts of inorganic filler, 1 to 5 parts of dispersing agent, 0.3 to 1.5 parts of defoaming agent, 1 to 6 parts of rheological additive, 2 to 6 parts of flame retardant and 30 to 60 parts of water. According to the water-based damping coating, the basalt fiber fibers are added, so that the mechanical property, especially the ductility, of the water-based damping coating is enhanced, the damping coefficient is increased, the anti-cracking and anti-bubbling effects can be achieved in the actual application process, and a better appearance effect and a better use effect are obtained.

The invention discloses a laminating 3D (three-dimensional) sound absorber and a preparation method thereof. The laminating 3D sound absorber comprises a covering layer, a first polyester staple fiber mesh layer and a fiber cotton layer which are sequentially compounded, needled holes are uniformly distributed in the surface of the fiber cotton layer, the hole diameter of each needled hole is not larger than 2mm, the depth of each needled hole is larger than two thirds of the thickness of the fiber cotton layer, and needling density is 1.0 needle / cm<2>-1.5 needles / cm<2>. Recyclable polyester fibers are used as raw materials and do not contain harmful substances, the harmful substances cannot be released, the materials can be recycled, and fiber cotton and coverings are adhered together through molten first polyester staple fibers. After the laminating 3D sound absorber is attached onto a wall, a cavity can be formed by the laminating 3D sound absorber and the wall, keels are omitted, and vibration transfer of sound is decreased, so that sound absorption and noise reduction effects are preferably achieved. The laminating 3D sound absorber is fine in sound absorption effect, and particularly, low-frequency sound absorption effects are obviously improved.

The invention discloses a high-power container type diesel generating set. The high-power container type diesel generating set comprises an auxiliary container, a power container and a connecting metal flexible pipe which is arranged between the auxiliary container and the power container, wherein the power container comprises a machine room and an electric appliance room, the machine room is internally provided with a diesel engine, a main generator, a starting motor, a storage battery and a charger, and the electric appliance room is internally provided with a high-voltage cabinet, a grounding cabinet and a control cabinet; the top part of the auxiliary container is in an open type, and a box door is in a shutter type; and the connecting metal flexible pipe comprises large-caliber steel wire braiding flexible pipes and small-caliber steel wire braiding flexible pipes, two large-caliber steel wire braiding flexible pipes are connected by adopting a movable flange, and two small-caliber steel wire braiding flexible pipes are connected by adopting a quick-change connector. According to the high-power container type diesel generating set disclosed by the invention, the generator and an auxiliary unit are respectively arranged in the two box bodies, the two box bodies are connected by adopting the steel wire braiding flexible pipes, and thus the high-power container type diesel generating set can effectively adapt to places with large environmental temperature difference and strong sandstorm and has the characteristics of noise reduction, shock absorption, easiness in disassembling and hoisting and the like.

The invention discloses sound-absorbing environmentally-friendly recycled asphalt concrete and a preparation process thereof, relates to the technical field of asphalt concrete processing, and solvesthe problem that asphalt concrete cannot effectively reduce urban noise during use due to poorer stability of noise reduction of the asphalt concrete. The asphalt concrete comprises the following components, in parts by weight: 75-80 parts of novel aggregate, 4-6 parts of SBS modified asphalt, 0.2-0.3 part of mineral powder, 16-22 parts of a recycled asphalt mixed old material, 0.04-0.08 part of aregenerant, 2.5-4.5 parts of a fibrous filler, 4-6 parts of a high-temperature-resistant sound-absorbing material, 3-3.5 parts of expanded vermiculite, 0.6-1.2 parts of water glass, and 0.4-0.8 partof microporous calcium silicate. The sound-absorbing environmentally-friendly recycled asphalt concrete provided by the invention has good sound-absorbing noise-reducing effects, can maintain good stability during use, and has a longer overall service life.

The invention relates to an ultra-quiet pavement paving material and application. The ultra-quiet pavement paving material comprises an aggregate, rubber and a two-component solvent-free polyurethanebinder, wherein the mass percentage of the two-component solvent-free polyurethane binder is 5.0-6.0%; the mass percentage of the rubber is 4-12%; the balance is the aggregate; and the two-component solvent-free polyurethane binder is synthesized by an epoxy resin and a polyurethane binder prepolymer according to a mass ratio of 1:(3-6). According to the pavement paving material which is providedby the invention, cubic rubber particles are adopted to be in contact with the aggregate to form connected pores, play good roles in sound absorption and noise reduction, and are easy to form stone-rubber-stone skeleton structures and can be in good contact with the aggregate, and thus the stability and the durability of the mixture can be ensured.

The invention relates to the preparation method of an acupuncturing 3D sound-absorbing body. The preparation method comprises the following steps:(a) weighting the first polyester staple fiber and fiber A respectively; (b) then entering into the cotton rolling equipment to carry out opening and mixing;(c) the fiber after processed by the cotton rolling equipment entering into a cotton mixing machine for further uniform mixing;(d) entering into the combing equipment and forming a fiber network after opening; (e) the fiber network entering into a stacking device for stacking;(f) forming cellucotton after first acupuncturing of the stacked fiber network; (g) placing a cotton blanket on the cellucotton, then carrying out the second acupuncturing to form into a acupuncturing cotton blanket;(h) cutting the acupuncturing cotton blanket into acupuncturing cotton blanket blocks by the cutting equipment; (i) enabling the acupuncturing cotton blanket blocks to enter into the heat setting equipment for heat setting; and(j) squeezing the acupuncturing cotton blanket blocks by a mould, so as to obtain the acupuncturing 3D sound-absorbing body. The 3D sound-absorbing body provided by the invention has the effects of sound absorption, noise reduction and decoration.

The invention relates to a noise isolating type solar cell for a building exterior wall. The noise isolating type solar cell is composed of a noise isolating material, a solar cell body and a waterproof adhesive. The noise isolating material is tailored according to the shape and the size of the building exterior wall, then the waterproof adhesive is smeared on the two faces of the noise isolating material, the solar cell body sticks to one face of the noise isolating material, and the outer face of the noise isolating material directly sticks to the exterior surface of the wall of a building. According to the noise isolating type solar cell, the power generation function is achieved, the sound absorption and noise reduction functions are achieved, and the noise isolating type solar cell for the building exterior wall is specially suitable for being used in residential buildings or commercial buildings which face streets in cities.

The invention belongs to the technical field of heat insulation materials, particularly relates to a preparation process of a rubber and plastic heat insulation material, and aims to solve the problems that a heat insulation material in the prior art cannot meet the performance requirements of heat insulation, water resistance, fire prevention and the like at the same time, and is low in strength, not resistant to pressure, small in stamping resistance, easy to age, not durable, poor in comprehensive performance and the like. The preparation process of the rubber and plastic heat insulation material comprises the following steps: adding silicone rubber, cyclohexyl methacrylate and diethylene glycol dibenzoate into recycled waste foamed plastic, mixing, adding a heat insulation filler, epoxidized soybean oil, oleamide, stearic acid, sulfur, an antioxidant, a flame retardant and a foaming agent, and mixing to obtain the rubber and plastic heat insulation material. The obtained rubber and plastic heat insulation material has excellent heat insulation and heat preservation, sound absorption and noise reduction, fire prevention, flame retardance, moisture prevention, water prevention and the like, is high in strength, has good stamping resistance and aging resistance, is excellent in comprehensive performance and long in service life, and can be widely applied to the fields of buildings, metallurgy, chemical engineering, electric power and the like.

The invention discloses light-steel house spray-building type bark-like wall paint. The light-steel house spray-building type bark-like wall paint is prepared from 30-40 parts by weight of shell powder, 20-30 parts by weight of acrylic floor paint, 10-15 parts by weight of diatom mud, 5-10 parts by weight of plant fibers, 10-15 parts by weight of gypsum, 1-5 parts by weight of a pigment, 7-15 parts by weight of glue and 1-3 parts by weight of additives. The light-steel house spray-building type bark-like wall paint has composite colors, three-dimensional texture, luxurious and elegant decorative effects, realistic bark imitation effects and natural, beautiful and decent texture, can be used for imitation of various patterns of the bark, has strong moisture-proof, waterproof, fire-proof, mildew-proof and alkali-resistant functions, is environmentally friendly, does not contain any toxic or harmful substances after testing, does not influence the human health and realizes direct use after spraying.

The invention discloses a dry-process sound-absorbing ceiling for automobiles, which is formed by post-processing the ceiling slabs. The ceiling slabs are composed of 5-layer board structures, wherein the first layer board is made of weight ratio Made of 2-2.5:1 glass fiber and polyethylene rubber powder; the second layer is made of modified expanded polystyrene; the third layer is made of glass fiber modified polyethylene rubber powder : the fourth layer is made of modified expanded polystyrene; the fifth layer is made of glass fiber and polyethylene rubber powder with a weight ratio of 2-2.5:1, and the present invention is used to reduce the dry ceiling The weight of the product can be reduced, and the NVH sound absorption performance of the ceiling itself can be improved.

The present invention discloses high-damping buffering and sound-absorbing rubber. The high-damping buffering and sound-absorbing rubber consists of main materials and an auxiliary agent, wherein the main materials are a brominated butyl rubber and polynorbornene. The high-damping buffering and sound-absorbing rubber disclosed by the prevent invention has the advantages of being wide in raw material source, low in cost, simple and convenient in preparation method, good in sound-absorbing and noise reducing effect, and the like.

The invention proposes an environment-friendly and energy-saving material for the surface layer of sports venues, which belongs to the technical field of composite materials, and is prepared from the following raw materials in parts by weight: 30-50 parts of polyether diol, 10-20 parts of polyether triol, 3-10 parts of toluene diisocyanate, 2-5 parts of diphenylmethane diisocyanate, 4-8 parts of modifier, 3-7 parts of silicon-aluminum porous microspheres, 0.2-1 part of anti-settling agent, 0.5-1 part of zinc oxide 15-25 parts of mineral oil, 22-35 parts of white carbon black. The main material of the present invention is a polyurethane material. By adding the above-mentioned modified materials and additives, the prepared material has good properties such as flame retardancy, heat preservation, sound absorption and noise reduction, weather resistance and wear resistance, and anti-skid performance. The service life of the material has broad application prospects.

A corn straw fiber gypsum board having sound-absorbing and noise-reducing functions is disclosed. Corn straw fibers are soaked with hot water to remove surface pectin layers. After anaerobic fermentation, the degree of surface roughness is obviously increased, the relative content of hemicellulose of the straw is reduced, and adhesive capability is enhanced. Compared with traditional alkali processing methods, effects are same, environment pollution is avoided and the cost is saved. The pretreated corn straw fibers are clad with modified polyvinyl alcohol for modification. During molding of the gypsum board, the modified corn straw fibers are in full contact with water, and the surface polyvinyl alcohol is softened to a certain degree or dissolved, penetrated into a gypsum substrate around the fibers, and interweaves the fibers and the gypsum substrate along with water evaporation, and therefore interface bonding of the corn straw fibers and the gypsum substrate is enhanced, mechanical properties and a waterproof property of a product are improved, and a product has characteristics of high absorptivity, good warm-keeping effects, significant sound-absorbing and noise-reducing effects, and the like.

The invention discloses a manufacturing method of an anti-fading spraying material. The anti-fading spraying material is prepared from the following raw materials in parts by weight: 100-300 parts ofpolyvinyl alcohol, 5-15 parts of a nano zinc oxide antibacterial agent, 3-7 parts of a film-forming agent, 1-3 parts of a defoaming agent, 1-5 parts of a thickener, 50-150 parts of shell powder, 50-150 parts of mica powder, 10-20 parts of manganese naphthenate, 50-70 parts of hydrophobic amino acid, 20-40 parts of titanium dioxide, 6-10 parts of montmorillonite, 100-200 parts of deionized water, 10-20 parts of a carbon dioxide adsorbent, 5-10 parts of cerium, and 5-10 parts of calcium. According to the manufacturing method of the anti-fading spraying material, the waterproof performance of thespraying material is improved, the volume of montmorillonite can be expanded by several times after montmorillonite makes contact with water, montmorillonite becomes paste, the volume of montmorillonite shrinks after montmorillonite is heated and dehydrated, and the spraying material has very high adsorption capacity and cation exchange performance.

The invention relates to a lava slab and a processing method thereof. The lava slab comprises slurry for the lava slab and glass fiber cloth. The slurry comprises the following raw materials in partsby weight: 35-45 parts of cement, 35-45 parts of magnesium oxide powder, 5-10 parts of vermiculite powder, 2-3 parts of perlite particles, 1-2 parts of heterochain high molecular polymers, 2-3 parts of cement modifiers and 30-40 parts of water. The produced lava slab has porous holes, and can realize a good sound absorption and noise reduction effect, which fills in the gap of the prior art that the cement board does not have the effect of sound absorption and noise reduction, and improves the competitiveness of the lava slab to enter the middle- and high-end market. In addition, the slurry includes 5-10 parts of vermiculite powder, and the scheme has the following effects: the lava slab has porous holes, and vermiculite has a higher layer charge number, so that the vermiculite has a higher cation exchange capacity and a stronger cation exchange adsorption capacity; therefore, the porous lava slab with the addition of vermiculite powder has an increased release area of negative oxygenions.

The invention is suitable for the technical field of living electric appliances, and provides a noise reduction device and a clothes treatment device. The noise reduction device comprises a body and asound absorption piece, and a first cavity and a second cavity which do not directly communicate are formed in the two ends of the body; the sound absorption piece is arranged outside the body in a sleeving manner; and an annular flow channel is formed between the body and the sound absorption piece, and the annular flow channel communicates with the first cavity and the second cavity. The clothes treatment device comprises the noise reduction device, a fan and a fan sound insulation assembly. According to the noise reduction device, the first cavity and the second cavity which do not directly communicate are formed in the two ends of the body, and the first cavity communicates with the second cavity through arranging the annular flow channel. Thus, the contact area and the contact time of noise and the sound absorption piece are increased, the sound absorption piece can better play a role in sound absorption and noise reduction, the noise generated in the actual use process of the clothes treatment device is effectively reduced, and the use comfort of a user is improved.

The invention discloses a noise reducing device for a warp knitting workshop. The noise reducing device includes a pipe body, a magnet, a plane volute spiral spring and a lifting hook, a lower base isinstalled at a bolt on the lower part of the pipe body, an upper end cover is installed at a bolt on the upper part of the pipe body, installation grooves are formed in the inner side face of the upper end cover and the inner side face of the lower base, a convex block is arranged on the upper part of the upper end cover, the pipe body is internally provided with a main shaft, sound-absorbing cotton is wound on the outer side of the main shaft, and the front side and the rear side of the tail end of the sound-absorbing cotton are connected with a second pull ring and the hook in a sewn mode correspondingly. According to the noise reducing device for the warp knitting workshop, the sound-absorbing cotton, the second pull ring and the hook are arranged, during use, the sound-absorbing cotton can absorb noise generated by machines, thus reducing the noise of the warp knitting workshop, meanwhile, by cooperating with use of the second pull ring and the hook, the sound-absorbing cotton oftwo devices are conveniently connected, a wall curtain made from the sound-absorbing cotton is conveniently combined, and thus sound absorption and noise reduction are well conducted on the warp knitting workshop, so that the practicability of the noise reducing device is improved.

The invention discloses a sound-absorbing and environmentally friendly recycled asphalt concrete and its preparation process, relates to the technical field of asphalt concrete processing, and solves the problem that the asphalt concrete cannot effectively reduce urban noise during use due to its poor noise reduction stability question. It includes the following components in parts by weight: 75-80 parts of new aggregate; 4-6 parts of SBS modified asphalt; 0.2-0.3 parts of mineral powder; 16-22 parts of regenerated asphalt mixed old material; 0.04-0.08 parts of regeneration agent ; 2.5-4.5 parts of fiber filler; 4-6 parts of high-temperature-resistant sound-absorbing material; 3-3.5 parts of expanded vermiculite; 0.6-1.2 parts of water glass; 0.4-0.8 parts of microporous calcium silicate. The sound-absorbing and environment-friendly recycled asphalt concrete in the present invention has a good sound-absorbing and noise-reducing effect, can maintain good stability during use, and has a long overall service life.

The invention discloses an acoustic metamaterial sound absorber which comprises an upper layer structure and a lower layer structure, the upper layer structure comprises an upper layer base body, a plurality of circular holes distributed in a linear array or a plane array are formed in the upper layer base body, and a film which covers the circular holes and has preset tension is arranged on the upper surface of the upper layer base body. A first permanent magnet located in the center of the circular hole is pasted on the film, and a closed metal circular ring surrounding the circular hole is arranged on the lower surface of the upper-layer base body; the lower-layer structure comprises a lower-layer base body with a frame support, a second permanent magnet is arranged at the position, corresponding to the round hole, of the lower-layer base body, and the magnetic pole directions of the first permanent magnet and the second permanent magnet are the same; the upper-layer structure and the lower-layer structure are bonded to form an integral structure. According to the invention, better sound absorption and noise reduction effects can be realized.

The invention provides a sound absorption and noise reduction multi-layer blow-off pipe which comprises a pipe body. The pipe body comprises a PE layer used as a main body. A graphitic layer is arranged inside the PE layer. A hydrophobic anti-corrosion layer is arranged inside the graphitic layer. A fire-proof layer is arranged outside the PE layer. A sound absorption layer is arranged outside the fire-proof layer. A PVDF layer is arranged outside the sound absorption layer. A noise insulation layer is arranged outside the PVDF layer. An anti-oxidation layer is arranged outside the noise insulation layer. According to the blow-off pipe, the multiple layers of structures are compounded, the service life is long, and the sound absorption and noise reduction functions are achieved.

The invention discloses a laminating 3D (three-dimensional) sound absorber and a preparation method thereof. The laminating 3D sound absorber comprises a covering layer, a first polyester staple fiber mesh layer and a fiber cotton layer which are sequentially compounded, needled holes are uniformly distributed in the surface of the fiber cotton layer, the hole diameter of each needled hole is not larger than 2mm, the depth of each needled hole is larger than two thirds of the thickness of the fiber cotton layer, and needling density is 1.0 needle / cm<2>-1.5 needles / cm<2>. Recyclable polyester fibers are used as raw materials and do not contain harmful substances, the harmful substances cannot be released, the materials can be recycled, and fiber cotton and coverings are adhered together through molten first polyester staple fibers. After the laminating 3D sound absorber is attached onto a wall, a cavity can be formed by the laminating 3D sound absorber and the wall, keels are omitted, and vibration transfer of sound is decreased, so that sound absorption and noise reduction effects are preferably achieved. The laminating 3D sound absorber is fine in sound absorption effect, and particularly, low-frequency sound absorption effects are obviously improved.

The invention is applicable to the technical field of household appliances and provides a muffler and a clothes treatment device. The above-mentioned muffler includes a body; a sound-absorbing part; it is sleeved on the outside of the body; wherein, an air channel is formed between the body and the sound-absorbing part, and the air channel includes a sound wave propagating around the inner surface of the sound-absorbing part Circular flow channel. The above-mentioned clothes treatment device includes the above-mentioned muffler, a fan, and a fan sound insulation assembly. The muffler can increase the contact area and contact time between the noise and the sound-absorbing parts by adopting a circular flow channel, which is beneficial to the sound-absorbing parts to better play the role of sound absorption and noise reduction, so that the noise generated by the clothing treatment device during actual use It has been effectively reduced and the comfort of users has been improved.

The invention provides a multi-functional short-staple rope twisting machine. The multi-functional short-staple rope twisting machine comprises anti-slip mats, left supporting legs, right supporting legs, a machine base, a U-shaped supporting frame, a rope twisting motor, a rotary disc, a linear sliding rail, U-shaped sliders, winged screws, rope twisting hooks, a rope taking and wheel replacing structure, a structure for coiling a rope after rope twisting, a rope twisting length measurement determining rail structure and an anti-overflow shield structure, wherein the anti-slip mats are transversely glued to the lower surfaces of the horizontal sections on the lower portions of the left supporting legs and the lower surfaces of the horizontal sections on the lower portions of the right supporting legs respectively. Due to the arrangement of a fixing rod, a movable sleeve, a fixing hook and a square-head bolt, the moving position of the fixing hook is easily adjusted according to the horizontal requirements of rope twisting, and it can be ensured that rope twisting work is smoothly conducted; due to the arrangement of an adjusting slider, a stainless steel sliding rail, a measurement ruler and an adjusting bolt, the rope twisting length is easily ensured, and the rope twisting length consistency can be ensured.

The invention belongs to the technical field of mahjong tiles, and particularly relates to a mahjong tile for a full-automatic mahjong machine, the mahjong tile comprises a shell, a shell cover, a core part and a magnet, one side of the core part is provided with an accommodating groove, the core part is arranged in the shell, the magnet is arranged in the accommodating groove, and the shell cover covers the shell. The core part is prepared from the following components in parts by weight: 50 to 70 parts of polyether polyol, 100 to 120 parts of isocyanate, 20 to 30 parts of a chain extender, 0.5 to 1.5 parts of a catalyst, 80 to 120 parts of hollow glass beads, 100 to 150 parts of loess, 1 to 3 parts of an expanding aid and 5 to 15 parts of water. According to the mahjong tile, the core part used for fixing the magnet is arranged between the shell and the shell cover, the core part generates the porous structure through foaming of the polyurethane and the loess, and the porous structure of the loess and the hollow glass beads are combined, so that the core part has good sound absorption and noise reduction effects; meanwhile, the hollow glass beads can effectively restrain structure defects caused by excessive volume expansion generated by high temperature and can effectively restrain volume shrinkage caused by hardening, so that the mass and the volume of the formed core part are both in a controllable range.