33results about How to "Reduce noise hazards" patented technology

A device aiding the flight management of an aircraft during a phase of landing on an airport includes means for automatically determining an adaptive aiming point that is shifted along the runway in the downstream direction and which can be used by different usual landing aid means of the aircraft.

The invention discloses a main driving mechanism of a six-arm cutterhead used for a shield machine. The main driving mechanism comprises a shield machine cutterhead and a main driving mechanism. The main driving mechanism is characterized by mainly comprising a synchronous variable frequency motor (1), a gear device (2) and a main bearing (3), wherein the output end of the variable frequency motor (1) is tightly connected with the input end of the gear device (2); the output end of the gear device (2) is connected with the main bearing (3) and drives the main bearing (3) to rotate; the main bearing (3) is connected with a shield machine cutterhead by connected flanges (4); the upper part of the main bearing is provided with a sealing assembly (5); the synchronous variable frequency motor (1) is provided with brake; and the variable frequency motor (1), the gearing device (2) and the main bearing (3) are connected to form a dismountable integral structure. In the invention, the synchronous variable frequency motor serves as a driving mode, full-amount torque can be reached when speed is regulated within a range from 0 to 50Hz, and the main driving mechanism has the beneficial effect of small starting current, high efficiency and small noise harm and is simple to maintain.

The invention discloses an inverse armature brazing machine with double feeding of brazing wire belts and a welding technology thereof. The inverse armature brazing machine comprises an armature preparation plate, a machine base, a loading supporting base, a servo clamping and indexing mechanism, an armature loading supporting roller mechanism, an armature supporting rectification mechanism, a wire pressing and welding mechanism, a first brazing wire belt feeding mechanism, a second brazing wire belt feeding mechanism, a brazing filler metal plate and a smoke absorption mechanism. According to the machine, the brazing wire belts can be fed to the welding areas between outer-layer wires and inner-layer wires and the welding areas between the inner-layer wires and a commutator segment at the same time so as to be located in the middle of a conducting loop in welding and become the largest heat emission spot, and therefore the problem that a commutator emits heat excessively and then becomes expanded and deformed in the traditional lateral brazing wire belt feeding and welding process is solved, and the problems that temperature rise is excessive and the service life is short due to the small sectional area of arc welding connection and welding spot connection caused by single feeding of the brazing wire belts are solved; two wire processes of argon arc welding are eliminated in the armature welding process, the welding efficiency is high, welding is more reliable, less brazing filler metal is used, and the welding benefit is better.

The invention discloses a method for coating wire with ice-snow prevention layers. The method comprises the following steps of spraying waterproof paint on the surface of the wires to form a coating layer, regulating the coating layer on the surface of the wire to enable the coating layer to reach the set thickness, and drying the coating layer of the wire at a temperature between 50 and 70 DEG C. The invention also discloses a coating device of the method. Because the invention adopts pressure coating, gaps among aluminum strands on the outermost layer of the wire can be filled up; through the adjustment of a diameter-setting mold, the coating layer is not only uniform in the surface, but also controllable in thickness, so the whole coated wire is smooth and compact in the surface, and snow or frozen rain is not easy to solidify on the surface of the wire; and a steel wire on a center layer of the wire is not easy to pollute by rainwater or corrosive atmosphere. Therefore, the wire not only has the characteristics of preventing ice and snow and resisting corrosion, but also has the advantages of reducing the vibrating and waving harm of breeze, lowering the level of corona and radio interference and enabling power transmission lines to be lower in noise hazard and friendlier to environment.

The invention discloses an energy-saving and environment-friendly screening device for constructional engineering construction building material gravel. An upper rail and a lower rail with the same structure are arranged in the machine body; a first material passing screen is borne on the upper rail and the lower rail, and a second material passing screen is borne on the two lower rails. An inclined panel with a material leaking hole is arranged in the middle of the first material passing sieve; an outflow square hole is formed in the right side of the first material passing sieve; sliding plates inclining towards the inner side of the middle part are arranged on the left and right sides of the bottom of the first material passing screen; a driving support is installed on the left side ofthe first material passing screen, a linkage rod and a driving motor are arranged in the driving chamber, the linkage rod is connected with a driving disc through a power rod, the power rod is hingedto the midpoint of the linkage rod and the outer circle side of the driving disc, and a second driving support connecting plate penetrates through the left side wall of the machine body and then is connected with the linkage rod. By arranging the first material passing screen, the second material passing screen and the driving chamber, gravel can be screened conveniently, and the beneficial effectof being environmentally friendly is achieved. The screening device is suitable for being widely applied to gravel screening.

The invention discloses a BIM-based machine room arrangement and construction guidance method, relates to the technical field of building construction, aims to solve the technical problem that inan existing machine room design mode, the installation and connection conditions of various devices can be known only after construction is completed, real-time model guidance does not exist, so that repeated construction is easily caused, and material waste is cause;. According to the technical scheme, the method is characterized by comprising the following steps that S100, surveying and mapping are conducted on site, and a surveying and mapping database is established according to data obtained through surveying and mapping; s200, BIM modeling is performed according to the data obtained by surveying and mapping, and the position of the equipment is planned in advance in the modeling process; s300, path planning is conducted on the line pipes, the water pipes and the air pipes used in the machine room, and adjustment is conducted in real time according to planning; s400, according to the basis provided by the model, modular production is conducted on the line pipes, the water pipes and theair pipes of the machine room; and S500, modular assembling and splicing are conducted on the site of the machine room. The effects of reducing material waste in the construction process and effectively saving resources are achieved.

A small oil squeezing device comprises a rack (1), wherein a feed barrel (2) is arranged on the rack; a dense screen is arranged at the middle section of the feed barrel (2); a squeezing device (3) is arranged at the bottom end of the feed barrel (2); a motor (4) is arranged at the middle section of the squeezing device (3); an oil outlet pipeline (5) is arranged on the squeezing device (3); an oil collecting basket (6) is arranged at the tail end of the oil outlet pipeline; during usage, rapeseeds are evenly poured into the feed barrel (2), the screen filters out redundant impurities, the motor (4) runs to perform preheating from the temperature of the squeezing device (3) for rotating and inward pressing, and oil is discharged via the oil outlet pipeline (5) and flows to the oil collecting basket (6); a power plug (7) is arranged on the rack (1), and low-voltage and direct-current type power supply is adopted for working; a control panel (8) is arranged for setting of the squeezing time and rate; a user can squeeze rapeseed oil at home directly and conveniently, carrying is not required, time and labor are saved during squeezing, the noise hazard is reduced, and the oil squeezing efficiency can be effectively improved.

The invention relates to a drilling coring machine for highway pavement detection. The drilling coring machine comprises a movable frame and a base; a bracket, a handle and vertical columns are connected and fixed to the top of the base from left to right; and the movable frame and the vertical columns constitute an up-down sliding structure through a fixed frame and a screw rod fixedly connectedto the bottom of a rotating handle. The drilling coring machine for highway pavement detection has the beneficial effects that by adopting the structures of a first side plate, a second side plate anda rubber baffle, a barrier can be formed on the outer circle of a drilling tube, noise generated when the drilling tube works is blocked, and thus the effect of lowering the noise hazard is achieved;the second side plate can be conveniently rotated to be opened, and thus the working efficiency of constructors is not affected; and through the design of a visual window, a worker can observe the drilling tube outside the first side plate and the second side plate, so that the more convenient effect is achieved.

The invention discloses a heat-insulated, sound-proof and shock-absorbent fiber mat and a preparation method. The heat-insulated, sound-proof and shock-absorbent fiber mat comprises a damping sound-proof felt, a PVC layer, a heat dispersion layer, a honeycomb layer, a sound-absorbing cotton layer, filling powder and shock-absorbent nets. The damping sound-proof felt is arranged on the outer surface of the heat-insulated, sound-proof and shock-absorbent fiber mat, the PVC layer is attached to the inner surface of the damping sound-proof felt, the heat dispersion layer is attached to the inner surface of the PVC layer, the honeycomb layer is attached to the inner surface of the heat dispersion layer, the sound-absorbing cotton layer, is arranged in the middle of the honeycomb layer, honeycomb holes in the honeycomb layer are filled with the filling powder, and the shock-absorbent nets are arranged in the heat dispersion layer and the honeycomb layer respectively. In the heat-insulated, sound-proof and shock-absorbent fiber mat and the preparation method, multiple layers of sound-proof layers are arranged, and in each layer, a suitable raw material is selected and a scientific raw material ratio is adopted. The prepared heat-insulated, sound-proof and shock-absorbent fiber mat can reduce noise and absorb shock, unnecessary noise hazards are reduced, safe driving can be ensured, the structure is simple, and the fiber mat is convenient to use.

The invention discloses an advertising board with a characteristic of resonance and sound-absorption, which is a sealed container body comprising a framework, a front advertisement surface and a back advertisement surface, wherein the front advertisement surface and the back advertisement surface have different vibrating frequencies and the container body forms a resonator. Compared with the existing advertising board, the advertising board of the invention has all the functions of the advertising board of the prior art; moreover, as the front advertisement surface and the back advertisement surface of the invention have different materials, thus having different vibrating frequencies, the container body forms a resonator, which can effectively absorbs low-frequency noises, reduces the harm done by noises and therefore returns a quiet city.

The invention discloses an automatic disc product rivet machine device. The automatic disc product rivet machine device comprises a frame assembly, a rotating disc assembly, a pressing machine assembly, an automatic discharging suction cup assembly, a discharging jacking assembly, a primary rivet mold feeding and discharging assembly, a secondary rivet mold feeding and discharging assembly, a safety grating, an emergency button, a starting button, a touch screen, a three-color lamp, an approach switch and a rotating disc assembly; the primary rivet mold feeding and discharging assembly, the safety grating, the secondary rivet mold feeding and discharging assembly, the automatic discharging suction cup assembly and the discharging jacking assembly are mounted in the frame assembly, the approach switch is arranged on the right side of the discharging jacking assembly, the rotating disc assembly is located below the primary rivet mold feeding and discharging assembly, the secondary rivet mold feeding and discharging assembly and the automatic discharging suction cup assembly, the emergency button, the start button and the touch screen are all arranged outside the frame assembly, and the three-color lamp is located at the top end of the side face of the frame assembly. Two automatic rivet working procedures are adopted to be finished at one time, rivet time is shortened, work time is shortened, and labor intensity is reduced.

The invention discloses a tumbler for meat product processing, which comprises a tumbler mechanism, a drive mechanism and a PLC electric control unit. A device and a transmission rod, a transmission rod is installed inside the tumbling chamber, tumbling paddles are installed at the upper and lower ends of the transmission rod, a vacuum generator is installed above the inside of the tumbling chamber, and the upper end of the vacuum generator is installed There is an air extraction pipe, an organic cover is installed on the upper end of the tumbling chamber, the driving mechanism includes a motor, a rotating shaft, a gear and a transmission belt, a rotating shaft is installed at one end of the motor, a gear is installed above the rotating shaft, and the PLC A frequency converter is installed at one end of the electric control unit, and a silencer is installed at the other end of the PLC electric control unit, and a material box is installed at one end of the silencer. The invention adopts an intelligent operating system, improves the degree of automation, and makes the effect of the tumbling product uniform.

The invention discloses a noise reduction type gas compressor, and belongs to the technical field of air compressors. The noise reduction type gas compressor comprises a sealing box, a noise reductioncomponent is fixedly connected to the inner wall of the sealing box, an air compressor body is fixedly installed at the bottom of the inner side of the sealing box, the air inlet end of the air compressor body is fixedly connected with an air inlet pipe communicating with the air compressor body, and the air outlet end of the air compressor body is fixedly connected with an exhaust pipe communicating with the air compressor body. According to the noise reduction type gas compressor, air on the outer side of the air compressor body is pumped away through a vacuum pump, transmission of noise ofthe air compressor body can be well weakened, meanwhile, a first reflecting layer, a second reflecting layer, a vacuum glass layer and the like can reflect and weaken noise, a damping layer can alsoreduce noise generated by the air inlet pipe and the exhaust pipe, a pressing block and an elastic pad can stabilize the air compressor body, the noise generation capacity of the air compressor body can be weakened, finally the influence of noise generated by a machine on the outside can be weakened, and harm to people is weakened.

The invention discloses sound elimination enclosure plates and an enclosure system which can effectively reduce the noise hazard. The enclosure system comprises a building base, a plurality of supporting pieces fixedly connected with the building base and the sound elimination enclosure plates; the sound elimination enclosure plates comprise plate face parts, connecting fixing parts (3) and overlapping buckling parts (4), wherein the connecting fixing parts (3) and the overlapping buckling parts (4) are located on the two sides of the width directions of the plate face parts; the connecting fixing parts (3) are used for being fixedly connected with the supporting pieces; every two adjacent sound elimination enclosure plates are buckled on the connecting fixing parts (3) in an overlapping mode through the overlapping buckling parts (4) to achieve bolt-free overlapping buckle connection; and the plate face parts comprise convex strips (1) and grooves (2) which longitudinally penetrate through the length direction and are arranged / formed at intervals. When external sound passes through the sound elimination enclosure plates, the sound noise is subjected to reflection and refraction at the grooves (2), energy conversion is generated, sound waves are converted into mechanical energy and heat energy, the sound elimination effect is achieved, the length directions of arrangement of all the sound elimination enclosure plates are perpendicular to the supporting pieces, and the sound elimination enclosure plates and the enclosure system can be widely applied to the field of metal enclosure.

The invention provides a humidifying and silencing ventilation pipeline device. A plurality of supporting racks are included and arranged in a ventilation pipeline. The section of each supporting rackis in a symmetric streamline shape, the head-tail direction of each supporting rack is kept to be consistent with the gas flowing direction, and gas jet flow flows towards the tails of the supportingracks from the heads of the supporting racks. An inner pipeline is arranged on the inner side of the front portion of each supporting rack, and a plurality of water spraying holes are formed in the wall faces of the two sides of the front portion of each supporting rack, wherein the inner pipeline comprises a driver, a transmission rod, a supporting pipe, an inner water conveying pipe and a rotary water spraying pipe, water can be sprayed from the positions of the water spraying holes, and the water spraying direction can be adjusted. Drying layers are arranged on the two sides of the rear portion of each supporting rack, water discharging grooves are formed in the lower positions of the drying layers, and the drying layers can absorb water of the surrounding environment and discharge water into the water discharging grooves. The water discharging grooves communicate with a water discharging pipe outside the ventilation pipeline. According to the humidifying and silencing ventilationpipeline device, on the basis of optimizing of the pipeline inner gas flow field, the humidifying noise lowering technology is utilized, spreading of noise in the ventilation pipeline is restrained, and background noise is lowered.

The invention discloses a gasoline-electricity hybrid power supply system and a control method of the gasoline-electricity hybrid power supply system, relates to an automatic power supply unit and a control method for realizing the automatic power supply unit, and aims at solving the problems of single power supply mode and short service life of the existing power supply unit. The power supply system comprises a diesel generating set, three alternating-current contactors, a rectifier, an AC / DC (alternating current / direct current) input power module, a BMS (Battery Management System), two lithium ion battery packs, a main controller and a diesel engine controller, wherein the diesel generating set and mains supply are used for supplying power to the two lithium ion battery packs and load simultaneously by adopting a double-input power supply mode according a principle that the mains supply is preferentially used, and when the diesel generating set and the mains supply do not work, the lithium ion battery packs are used for supplying power to the load; when the capacities of the lithium ion battery packs are smaller than a set value, the diesel generating set is started to supply power to the load and charge the lithium ion battery packs simultaneously, and finally stops working when full charging is achieved. The technology is used for the power supply system.

The invention discloses a main driving mechanism of a six-arm cutterhead used for a shield machine. The main driving mechanism comprises a shield machine cutterhead and a main driving mechanism. The main driving mechanism is characterized by mainly comprising a synchronous variable frequency motor (1), a gear device (2) and a main bearing (3), wherein the output end of the variable frequency motor (1) is tightly connected with the input end of the gear device (2); the output end of the gear device (2) is connected with the main bearing (3) and drives the main bearing (3) to rotate; the main bearing (3) is connected with a shield machine cutterhead by connected flanges (4); the upper part of the main bearing is provided with a sealing assembly (5); the synchronous variable frequency motor (1) is provided with brake; and the variable frequency motor (1), the gearing device (2) and the main bearing (3) are connected to form a dismountable integral structure. In the invention, the synchronous variable frequency motor serves as a driving mode, full-amount torque can be reached when speed is regulated within a range from 0 to 50Hz, and the main driving mechanism has the beneficial effect of small starting current, high efficiency and small noise harm and is simple to maintain.

The invention relates to the technical field of solid wood boards, and discloses a cutting device for the solid wood board. The cutting device comprises a working frame, wherein the working frame is provided with a long roller and a short roller; a clamping rod is arranged on the side face of the working frame, and a spring is arranged on the clamping rod in a sleeving mode; the clamping rod is in threaded connection with a large nut, and the clamping rod is connected with a clamping plate; the clamping plate is provided with a rolling wheel, so that the solid wood board is clamped during going forward to prevent swinging from side to side when being cut; the bottom of the inner wall of the working frame is fixedly connected with the top of a conical funnel, the bottom of the conical funnel is fixedly connected with the top of a wood chip box, and the right side of the wood chip box is fixedly connected with a chip removal opening; the right side of the inner wall of the working frame is fixedly connected with the left side of a fixed supporting plate, and the top of the fixed supporting plate is fixedly connected with the bottom of a motor; and the output end of the motor is fixedly connected with a cutting knife. Sound insulation cotton is arranged on the inner wall of a top cover, and cotton woven cloth is arranged on the back face of the top cover, so that wood chip splashing can be reduced, and too large noise can be avoided. Therefore, noise harm is reduced, and the cleanliness of the operation surrounding environment is improved.

The invention discloses a hot galvanizing noise reduction and edge thickness control baffle, device and method, and relates to the field of noise reduction baffles. The hot galvanizing noise reductionand edge thickness control baffle comprises a baffle, a mounting block on the upper portion of the baffle and a noise reduction plate, wherein the hot galvanizing noise reduction and edge thickness control baffle is divided into a working area, a transition area and a noise reduction area, the lower end of one side, far away from the transition area, of the working area is arc-shaped, the transition area and the noise reduction area are provided with airflow guide grooves, and the noise reduction area is also provided with the noise reduction plate. The hot galvanizing noise reduction and edge thickness control device comprises the hot galvanizing noise reduction and edge thickness control baffle, strip steel and an air knife plate, when the strip steel is treated by the hot galvanizing noise reduction and edge thickness control device, the noise pollution is reduced due to the special structure of the baffle and the matched use method of the device, and the edge thickness control ofthe treated strip steel is better.

The invention relates to the technical field of motor damping, in particular to a motor mounting frame, a fan assembly and an air purifier. The motor mounting frame comprises a shaft sleeve and a bearing. A through hole is formed in the shaft sleeve. The bearing is directly or indirectly in assembly connection with the shaft sleeve. A positioning shaft hole is formed in the bearing and is parallelto the axis direction of the through hole. A shaft sleeve convex edge is arranged along at least part of an outer edge of the shaft sleeve. Fixed positions are formed on the shaft sleeve convex edges. The motor mounting frame provided by the invention is provided with the shaft sleeve convex edge along at least part of the outer edge of the shaft sleeve, and the fixed positions are formed on theshaft sleeve convex edge, so that the motor mounting frame can be fixed through the fixed positions. A motor shaft is convenient to rotate in the motor mounting frame according to the specific axis without relative shaking when the motor mounting frame is fixed, and the smooth and steady operation of a motor is ensured.

The invention relates to the technical field of medical equipment, in particular to a breathing machine. The breathing machine comprises a respirator and a humidifier, the respirator and the humidifier are arranged side by side and communicate with each other, the respirator comprises a respirator shell and an air pumping mechanism arranged in the respirator shell, the air pumping mechanism comprises an air pumping outer shell, an air pumping inner shell arranged in the air pumping outer shell and an air pumping assembly arranged in the air pumping inner shell, the air pumping outer shell is provided with an air pumping port assembly penetrating through the respirator shell and communicating with the outside of the respirator shell, a silencing channel communicating the air pumping outer shell and the air pumping inner shell is arranged between the air pumping outer shell and the air pumping inner shell, and the air pumping inner shell is provided with an air supply port assembly which penetrates through the air pumping outer shell and the respirator shell and communicates with the humidifier. The breathing machine has the following effects that the silencing channel is used for reducing airflow noise and working noise of the air pumping assembly so as to reduce noise hazards when the breathing machine works.

Provided is a noncontact intelligent multi-sound electronic horn. At present, automobile electronic horns are single in tones, make the same sound (being consistent in the sound level) under any circumferences, and make relatively larger noise when the using sites are different. The noncontact intelligent multi-sound electronic horn is formed by a circuit board assembly and a mechanical assembly,wherein the circuit board assembly is formed by a communication module (1), a master control circuit module (2), a drive circuit module (3), a switch module (4) and a closed loop reactive circuit (5);the circuit board assembly is connected with a coil assembly in the mechanical assembly in a welding mode to form a horn system (6), thus implementing a noncontact intelligent multi-sound electronichorn; and the mechanical assembly is formed by a membrane assembly (7), the coil assembly (8), a housing assembly (9), a plastic shell assembly (10) and auxiliary members. The invention is applied toa noncontact intelligent multi-sound electronic horn.

The invention discloses a method for coating wire with ice-snow prevention layers. The method comprises the following steps of spraying waterproof paint on the surface of the wires to form a coating layer, regulating the coating layer on the surface of the wire to enable the coating layer to reach the set thickness, and drying the coating layer of the wire at a temperature between 50 and 70 DEG C. The invention also discloses a coating device of the method. Because the invention adopts pressure coating, gaps among aluminum strands on the outermost layer of the wire can be filled up; through the adjustment of a diameter-setting mold, the coating layer is not only uniform in the surface, but also controllable in thickness, so the whole coated wire is smooth and compact in the surface, and snow or frozen rain is not easy to solidify on the surface of the wire; and a steel wire on a center layer of the wire is not easy to pollute by rainwater or corrosive atmosphere. Therefore, the wire not only has the characteristics of preventing ice and snow and resisting corrosion, but also has the advantages of reducing the vibrating and waving harm of breeze, lowering the level of corona and radio interference and enabling power transmission lines to be lower in noise hazard and friendlier to environment.

The invention provides a humidifying and silencing ventilation pipeline device. A plurality of supporting racks are included and arranged in a ventilation pipeline. The section of each supporting rackis in a symmetric streamline shape, the head-tail direction of each supporting rack is kept to be consistent with the gas flowing direction, and gas jet flow flows towards the tails of the supportingracks from the heads of the supporting racks. An inner pipeline is arranged on the inner side of the front portion of each supporting rack, and a plurality of water spraying holes are formed in the wall faces of the two sides of the front portion of each supporting rack, wherein the inner pipeline comprises a driver, a transmission rod, a supporting pipe, an inner water conveying pipe and a rotary water spraying pipe, water can be sprayed from the positions of the water spraying holes, and the water spraying direction can be adjusted. Drying layers are arranged on the two sides of the rear portion of each supporting rack, water discharging grooves are formed in the lower positions of the drying layers, and the drying layers can absorb water of the surrounding environment and discharge water into the water discharging grooves. The water discharging grooves communicate with a water discharging pipe outside the ventilation pipeline. According to the humidifying and silencing ventilationpipeline device, on the basis of optimizing of the pipeline inner gas flow field, the humidifying noise lowering technology is utilized, spreading of noise in the ventilation pipeline is restrained, and background noise is lowered.

A method and apparatus for assisting in flight management of an aircraft during a landing phase. The device comprises means for automatically determining an adaptive aiming point (P1f) which is offset in the downstream direction along the runway (15) and which can be used by different common landing aids of the aircraft.

The invention relates to a continuous travel track (5) to be supported by a bridge structure (1) comprising at least two bridge segments (4) and a bearing framework for supporting said segments (4), the travel track (5) comprising: continuous flagstone (50) extending from one end of the bridge (1) to the other; an anti-friction layer (55) arranged beneath the continuous flagstone (50); and a crossing plate (53) arranged beneath the continuous flagstone (50). Said travel track comprising at least one anti-rising device (54).

The invention discloses sound elimination enclosure plates and an enclosure system which can effectively reduce the noise hazard. The enclosure system comprises a building base, a plurality of supporting pieces fixedly connected with the building base and the sound elimination enclosure plates; the sound elimination enclosure plates comprise plate face parts, connecting fixing parts (3) and overlapping buckling parts (4), wherein the connecting fixing parts (3) and the overlapping buckling parts (4) are located on the two sides of the width directions of the plate face parts; the connecting fixing parts (3) are used for being fixedly connected with the supporting pieces; every two adjacent sound elimination enclosure plates are buckled on the connecting fixing parts (3) in an overlapping mode through the overlapping buckling parts (4) to achieve bolt-free overlapping buckle connection; and the plate face parts comprise convex strips (1) and grooves (2) which longitudinally penetrate through the length direction and are arranged / formed at intervals. When external sound passes through the sound elimination enclosure plates, the sound noise is subjected to reflection and refraction at the grooves (2), energy conversion is generated, sound waves are converted into mechanical energy and heat energy, the sound elimination effect is achieved, the length directions of arrangement of all the sound elimination enclosure plates are perpendicular to the supporting pieces, and the sound elimination enclosure plates and the enclosure system can be widely applied to the field of metal enclosure.

The invention discloses an inverse armature brazing machine with double feeding of brazing wire belts and a welding technology thereof. The inverse armature brazing machine comprises an armature preparation plate, a machine base, a loading supporting base, a servo clamping and indexing mechanism, an armature loading supporting roller mechanism, an armature supporting rectification mechanism, a wire pressing and welding mechanism, a first brazing wire belt feeding mechanism, a second brazing wire belt feeding mechanism, a brazing filler metal plate and a smoke absorption mechanism. According to the machine, the brazing wire belts can be fed to the welding areas between outer-layer wires and inner-layer wires and the welding areas between the inner-layer wires and a commutator segment at the same time so as to be located in the middle of a conducting loop in welding and become the largest heat emission spot, and therefore the problem that a commutator emits heat excessively and then becomes expanded and deformed in the traditional lateral brazing wire belt feeding and welding process is solved, and the problems that temperature rise is excessive and the service life is short due to the small sectional area of arc welding connection and welding spot connection caused by single feeding of the brazing wire belts are solved; two wire processes of argon arc welding are eliminated in the armature welding process, the welding efficiency is high, welding is more reliable, less brazing filler metal is used, and the welding benefit is better.