530 results about "Noise pollution" patented technology

The invention discloses a heterogeneous sensing early warning system based on decoupling perception and adversarial robust learning, and the system comprises a feature extraction module which processes heterogeneous sensor original data collected in real time through a multi-layer decoupling encoder, separates target related features and environment interference features, and suppresses noise pollution from the source; the multi-dimensional collaborative fusion module adopts a cross-domain adversarial robustness learning framework to carry out space-time sequence alignment and deep fusion on decoupling features to generate high-robustness joint representation, and a data missing problem is processed through a cross-modal generative feature completion mechanism; and the cognitive enhancement closed-loop decision module constructs a cognitive heuristic confidence evaluation model based on joint representation, realizes graded early warning by combining real-time quality scoring and behavior prediction, and dynamically optimizes system parameters through a feedback mechanism. According to the method, the problems of poor target detection robustness, high delay and low accuracy in a complex dynamic environment are solved, the detection precision is remarkably improved, the false alarm rate is reduced, and the all-weather adaptive capacity is enhanced.

The invention relates to the technical field of electrical fault monitoring, in particular to an intelligent mobile substation electrical fault monitoring method, which comprises the following steps of: synchronously acquiring an electrical monitoring signal, a multi-dimensional environment noise signal and a dynamic working condition parameter of a mobile substation through a multi-source sensor; the method comprises the following steps: constructing an environmental noise floor vector group by adopting multi-scale spectrum mode decomposition, filtering an environmental noise interference component from an electrical monitoring signal through orthogonal projection filtering, and outputting a baseline correction signal; a working condition disturbance response field matrix is constructed based on time domain and frequency domain correlation analysis of dynamic working condition parameters, gradient sensitivity coefficients are calculated, and components strongly related to working condition disturbance and residual components weakly related to equipment faults are separated out; reconstructing the residual component into a pure fault feature vector; and finally, fault type diagnosis and risk early warning are carried out on the basis. The method effectively solves the problem of fault feature annihilation caused by noise pollution in a complex environment and the problem of false alarm and missing alarm caused by confusion of working condition disturbance and real fault signals.

The invention discloses a noise exposure evaluation method and system considering an unmanned aerial vehicle, and the method comprises the steps: obtaining urban environment data and unmanned aerial vehicle related data, carrying out the sound source modeling of the noise of the unmanned aerial vehicle, simulating the propagation of the noise of the unmanned aerial vehicle in an urban environment, and generating an unmanned aerial vehicle noise map; combining and calculating the unmanned aerial vehicle noise map and the current city noise map in combination with the current city noise map to obtain a city noise map; identifying crowd distribution conditions in different time periods and mapping the crowd distribution conditions to geographic space to form crowd distribution maps in different time periods, and performing feature identification and analysis on crowds in combination with multi-source data to obtain a crowd distribution map with crowd feature information; and according to the urban noise map and the crowd distribution map, calculating the total amount of regional noise pollution and the per capita noise pollution index, and calculating the noise exposure levels of different crowds. According to the method, the noise exposure evaluation method is perfected, and the space-time accuracy of unmanned aerial vehicle noise exposure evaluation is improved.

The invention discloses a road environment semantic segmentation method based on cross-modal difference modulation and a visual basic model, and the method is based on a DINOv3 visual basic model of a frozen weight, and introduces a complementary difference fusion module and a bidirectional context flow alignment module through the design of double-flow frozen coding and difference perception interaction. According to the method, a cross attention weight is generated by calculating a local high-frequency difference, so that transverse anti-noise complementation of RGB texture information and a Depth geometric structure is realized, and single-mode noise pollution is effectively inhibited; the two-way cross-scale alignment mechanism of top-down space mask guidance and bottom-up channel feature feedback is constructed by the two-way cross-scale alignment mechanism, and the scale barrier of deep and shallow layer features is broken. Therefore, joint feature representation with deep synergy of semantics and structures is obtained, inhibition of the model to environmental noise and reservation of tiny object details are balanced in a complex road scene, and pixel-level semantic segmentation with high generalization and high precision is realized.

The invention relates to a community low altitude-oriented aircraft path planning and traffic capacity evaluation system. The system comprises an airspace facility modeling module, a facility relation judgment module, a hierarchical airspace segmentation module, a noise-speed-safe distance constraint calculation module, a dynamic obstacle marking module, a multi-target path planning module and a bottleneck identification and traffic capacity evaluation module. The method comprises the following steps: modeling airspace facilities, and judging a facility relationship based on spatial geometric attributes and function use requirements of the facilities; performing hierarchical grid division on the low altitude of the community, calculating a safety distance along the movement direction and a safety distance perpendicular to the flight direction, and performing obstacle marking on grids around the building based on the safety distances and the flight direction; and performing path search based on an improved A * algorithm, identifying a bottleneck region, extracting parameters, and calculating the maximum allowable speed of the bottleneck region and the total traffic capacity of the bottleneck region. The system can relieve environmental troubles such as safety compliance dispute and noise pollution caused by operation of the low-altitude aircraft.

The present invention relates to the technical field of electric fault monitoring, and specifically to an intelligent mobile substation electric fault monitoring method. The method synchronously collects electrical monitoring signals, multi-dimensional environmental noise signals and dynamic operating parameters of the mobile substation through multi-source sensors; adopts multi-scale spectral modal decomposition to construct an environmental noise basis vector group, filters out environmental noise interference components from the electrical monitoring signal through orthogonal projection filtering, and outputs a baseline correction signal; constructs an operating condition disturbance response field matrix based on time domain and frequency domain correlation analysis of dynamic operating condition parameters, calculates gradient sensitivity coefficients, separates components strongly correlated with operating condition disturbances and residual components weakly correlated with equipment faults; reconstructs the residual components into pure fault feature vectors; and finally performs fault type diagnosis and risk warning based on the pure fault feature vectors. The method effectively solves the problem of fault feature annihilation caused by noise pollution in complex environments, and the problem of false alarms and missed alarms caused by confusion between operating condition disturbances and real fault signals.

The utility model relates to the field of power transformation engineering sound barriers, in particular to a power transformation engineering movable noise reduction barrier capable of being patrolled externally, which comprises a plurality of steel columns, a steel bottom beam positioned at the lower sections of the steel columns and a steel top beam positioned at the upper sections of the steel columns, and the plurality of steel columns, the steel bottom beam and the steel top beam form a sound barrier frame. A sound barrier plate is arranged between every two adjacent steel columns, and the sound barrier frame and the sound barrier plates form a noise reduction barrier. The sound barrier construction period of the transformer substation and the converter station is shortened. According to the utility model, on-site material, machine tool and personnel investment is reduced, construction waste emission is reduced, noise pollution is reduced, and carbon emission is reduced. Daily patrol of operators is facilitated, the device can be quickly moved when the device needs to be carried during maintenance, a channel is reserved for carrying the device, the power failure time is effectively saved, and the working efficiency is improved. The technical problems that the construction period is long, resources are wasted, pollution is serious, and replacement and carrying are inconvenient can be solved.

The invention discloses a simulation analysis method and system for transformer vibration noise under direct current magnetic bias, and the method comprises the steps: building a transformer geometric model, and carrying out the mesh generation of the transformer geometric model; external excitation of the transformer is set in the field-circuit coupling model of the transformer under the direct-current magnetic bias condition, and magnetic density distribution of the transformer under different magnetic bias currents is obtained through simulation; in the transformer electromagnetic structure coupling model, calculating to obtain vibration acceleration of the transformer under different bias currents; the vibration acceleration of the transformer serves as excitation, and sound pressure levels around the transformer under different bias currents are calculated; and analyzing the influence rule of different bias currents on the vibration noise of the transformer through the characteristic quantity of the frequency spectrum signal. According to the invention, the vibration noise characteristics of the transformer under different magnetic bias currents can be accurately simulated, and technical support is provided for judging whether the transformer has a direct current magnetic bias phenomenon or not. The method can improve the evaluation efficiency and simulation accuracy, and improve the noise pollution and overall performance of the transformer.

The invention discloses a non-Gaussian noise pollution spiral shaft rod type part measurement signal processing method, which can realize reliable purification of measurement signals, stable separation of bending deviation and spiral raceway morphology items and fitting reconstruction when pollution such as heavy tails, multiple peaks, burrs and sheet abnormal points exists. The method comprises the following steps: acquiring and synchronously registering measurement data of rotation and axial movement, establishing a joint fitting model for decomposing readings into deformation items and spiral raceway morphology items, and expressing the morphology items by multi-order harmonics, and a three-stage process is adopted to complete baseline establishment and coarse elimination, phase locking and fine filtering in sequence, and the harmonic order of the optimal spiral raceway morphology item is determined in a self-adaptive manner and finally reconstructed. The invention provides an effective solution for the problems that the continuous rotary scanning measurement signal of the spiral shaft rod type part is unstable in recovery and is easy to distort in reconstruction under the non-Gaussian noise pollution.

The invention relates to the technical field of industrial safety, and discloses an electrolytic aluminum short circuit port key operation parameter online monitoring and explosion safety protection system which comprises a parameter real-time monitoring module, a threshold activation judgment module, a digital twin modeling module, a risk dynamic prediction module, a protection decision analysis module and an intervention scheme execution module. By constructing a multi-source signal cooperative verification mechanism, when short-circuit parameters are monitored in real time, a self-adaptive digital filtering algorithm is adopted to dynamically match magnetic field intensity and temperature disturbance characteristics, noise stripping and baseline calibration are carried out on original voltage and current signals, the monitoring accuracy of core parameters such as short-circuit resistance is ensured, false alarm triggering is avoided, and real-time monitoring of the short-circuit parameters is realized. And meanwhile, by establishing a parameter credibility scoring model, when signal distortion exceeds a tolerance threshold, a standby sensing channel is automatically switched, so that the risk of production interruption caused by noise pollution is further reduced, and the anti-interference capability and the operation stability of the system are improved.

The invention discloses an audio signal measurement method and device, an electronic device and a storage medium, and relates to the field of audio signal measurement, and the method comprises the steps: deploying a detection microphone nearby a tested device, and arranging a reference microphone in a noise field, so as to synchronously collect a mixed signal containing a test signal and noise, and a pure ambient noise reference signal. After the noise of the two signals is subjected to correlation evaluation and the consistency of noise sources is confirmed, dynamically changing noise components are accurately stripped from the signals of the tested equipment by utilizing real-time noise data acquired by the reference microphone and through an adaptive noise cancellation algorithm, so that pure test signals are restored. Therefore, the problem of non-stationary noise pollution is solved through an active signal processing means instead of depending on imperfect physical sound insulation, and accurate and efficient measurement of the performance of the microphone in a noisy environment is realized.

The invention relates to the technical field of audio signal processing, and discloses an industrial noise identification method and system, and the method comprises the steps: obtaining an audio signal, and carrying out the time-frequency decomposition, and obtaining preliminary decomposition data; classifying the coupling features of the preliminary decomposition data to obtain a coupling region boundary value; if the boundary value of the coupling region exceeds a preset boundary threshold value, performing filtering processing to obtain separated noise spectrum data; calculating an overlapping proportion of the separated noise spectrum data and a preset target sound; if the overlapping proportion causes extraction deviation, extracting dynamic change characteristics of the separated noise spectrum data and fusing the dynamic change characteristics into a spectrum extraction process to obtain an accurate noise spectrum; calculating an intensity value according to the accurate noise spectrum, and determining an intensity evaluation result; and comparing the intensity evaluation result with a preset pollution threshold, calculating a noise pollution degree and outputting a noise identification result. The method is suitable for industrial environment noise monitoring, and can accurately extract the noise spectrum.

The embodiment of the invention relates to a noise reduction device and power equipment. The noise reduction device comprises an air duct structure and a first expansion chamber. The air duct structure includes an air duct wall defining an air duct including an inlet and an outlet. The air duct wall comprises a first wall, and a first hole is formed in a first area of the first wall. The first expansion chamber is adjacent to the first wall of the air duct structure and comprises a first expansion chamber wall, the first expansion chamber wall and the first wall define a first space, and the first space communicates with the air duct through the first hole. The first aperture is configured such that acoustic impedance within the duct increases at the first region by an amount exceeding a first threshold to prevent acoustic waves of a first frequency band entering the duct through the inlet from passing through the outlet. Through the technical scheme of the embodiment of the invention, the noise emitted by the noise source can be effectively reduced, and the noise pollution of the environment is reduced.

The invention provides an intelligent city data acquisition method and system based on the industrial Internet, and relates to the technical field of data processing, and the method comprises the steps: obtaining the state information of industrial equipment in a monitoring region within a certain historical time, and noise data collected by a plurality of noise sensors; obtaining a noise thermodynamic diagram of the monitoring area according to the noise data; obtaining noise pollution state information of the monitoring area according to the noise thermodynamic diagram; determining source industrial equipment causing noise pollution according to the noise pollution state information and the noise thermodynamic diagram; establishing a noise pollution prediction model to obtain a mapping relationship between the state information of the source industrial equipment and noise pollution state information; and predicting the noise pollution of the monitoring area through the noise pollution prediction model. According to the method, the possible noise pollution condition can be warned in advance, support is provided for an enterprise to optimize the production process of industrial equipment and improve the management level, and decision support can be provided for management of an intelligent city.

The utility model discloses an air source heat pump unit with noise reduction and sound insulation, which relates to the technical field of air source heat pump units and comprises a front cover component and an air source heat pump body, the air source heat pump body is mounted in the front cover component, one side of the front cover component is connected with a movable plate, and a base component is mounted at the bottom of the front cover component. The back side of the front cover assembly is connected with a back plate assembly, and wall hanging pieces are symmetrically installed on the side, away from the front cover assembly, of the back plate assembly up and down. According to the air source heat pump unit with the noise reduction and sound insulation functions, the noise reduction pad and the damping plate are arranged on the inner wall of the front cover body, meanwhile, the noise reduction net rack is installed on the surface of one side of the back plate main body, and the movable plate is matched for combined use, so that the noise reduction and sound insulation functions can be provided for operation of the air source heat pump main body as much as possible, and noise pollution caused by device operation is reduced; in addition, through the use of the base assembly and the wall hanging piece, the whole device can be selectively fixed to the wall or the ground according to use requirements.

The utility model relates to the technical field of improving the mute effect of an automobile tire, and discloses a mute structure for improving the mute effect of the automobile tire, mute cotton formed by a polyurethane matrix is embedded in the inner wall of the tire, the matrix is provided with micropores, and reinforced fibers are respectively arranged in the transverse direction and the longitudinal direction of the matrix. And the polyurethane matrix is bonded with the inner wall of the tire through a glue layer. The silence cotton can effectively absorb and disperse vibration and noise generated in the running process of the tire through the combination of the micropore structure and the reinforced fibers. In addition, the use of the polyurethane matrix ensures that the mute cotton has good elasticity and durability, so that the mute effect of the mute cotton is kept in long-term use. According to the utility model, not only is the comfort of the automobile improved, but also the noise pollution to the environment is reduced. By adopting the organic silicon sealing glue as the bonding layer, the tight combination of the mute cotton and the inner wall of the tire is ensured, the abnormal sound possibly generated in the driving process is avoided, and the high practical value and the market application prospect are achieved.

The invention relates to the technical field of intelligent traffic equipment, in particular to an induction blind sidewalk brick, a trigger type tactile stick and a blind sidewalk cooperation system. The sensing blind sidewalk brick comprises a blind sidewalk brick body and a sensing device, wherein a cavity is formed in the blind sidewalk brick body; the trigger device is arranged on the blind sidewalk brick body and is used for receiving a trigger signal triggered by short-distance wireless induction; the sensing device is arranged in the cavity and is in signal connection with the triggering device, and the sensing device sends out a warning signal after the triggering device receives the triggering signal; wherein the trigger device is a tactile stick trigger device; a trigger signal triggered by short-distance wireless induction is sent out by the tactile stick. According to the tactile stick, a point-to-point identification relation is established through close-range induction (magnetism, metal and radio frequency), and the effect that the brick responds only when a visually impaired person carrying the tactile stick arrives is achieved; the selective triggering suppresses broadcast flooding caused by scene noise (raindrops, footsteps, baby carriages and the like), so that information fatigue and urban noise pollution are avoided.

The utility model relates to the technical field of environmental protection engineering, construction engineering waste treatment and resource recovery, and discloses an environment-friendly concrete waste recovery device which comprises a base, a crushing box is fixedly arranged at the top of the base through a fixing frame, a conveying belt is rotationally arranged on one side of the crushing box, and the other end of the conveying belt is rotationally arranged on one side of a screening box. According to the environment-friendly concrete waste recycling device, the crushing box, the screening box, the dust removal box and the sound insulation plate are arranged, aggregate crushed through the crushing box enters the screening box to be screened, the aggregate of different sizes is collected, dust generated in the screening process is removed through the dust removal box, and the dust removal effect is good. And meanwhile, noise generated in the recycling process can be reduced to a certain degree by a sound insulation plate, and the effects that dust generated in the treatment process can be effectively reduced, aggregate of different sizes can be screened and recycled respectively, and noise pollution generated in the recycling process can be effectively reduced are achieved.

The invention discloses a GIS-based sound environment threshold value rapid query method, and particularly relates to the technical field of environment noise monitoring and intelligent city management. The method comprises the following steps: acquiring meteorological data and topographic data, analyzing the influence of the environment on noise propagation, calculating an actual noise influence range by combining time information and utilizing a dynamic noise propagation model, adjusting a basic noise limit value, and forming a more accurate dynamic threshold value; in combination with real-time noise monitoring data and traffic flow data, a spatial buffer area algorithm is adopted to evaluate a noise exceeding range, complaint frequency weight is introduced to calculate the noise pollution severity of complaint points, and an optimal treatment scheme is intelligently matched; by continuously monitoring the treatment effect, if the noise pollution is not effectively reduced, the treatment strategy is dynamically adjusted, and the noise propagation model is continuously optimized, so that the accuracy of noise prediction and management is improved, a self-adaptive optimization intelligent noise supervision system is constructed, and the scientificity and intelligent level of urban noise treatment are improved.

The utility model relates to the technical field of drainage pipe fittings, in particular to a waterproof hammer drainage pipe fitting which comprises an inner pipe and an outer pipe, one end of the inner pipe is a closed end, and a water outlet is formed in the side wall of the inner pipe; the outer pipe is arranged outside the inner pipe in a sleeving manner and is connected with the inner pipe; and the water outlet is communicated with the outer pipe. The closed end is arranged to bear the impact of water flow, after the flow speed of the water flow is reduced, the water flow is guided through the water outlet and the appearance inner wall, the water flow speed is further reduced, and therefore pipeline vibration and noise pollution are avoided.

The invention discloses a noise reduction type disrotatory fog gun, and relates to the technical field of environmental protection. The noise reduction type contra-rotating fog gun comprises an air guide barrel, a first sound absorption barrel, a contra-rotating air outlet device and a spraying device. The first sound absorption cylinder is arranged in the air guide cylinder, a first sound absorption cavity is formed between the first sound absorption cylinder and the air guide cylinder, a plurality of first sound absorption holes are densely formed in the first sound absorption cylinder, the first sound absorption holes communicate with the first sound absorption cavity, the contra-rotating air outlet device is installed in the first sound absorption cylinder, and the spraying device is installed at the air outlet end of the air guide cylinder; the contra-rotating air outlet device comprises a driving part, a first impeller, a reverse transmission assembly and a second impeller, the driving part is connected with the first impeller, the reverse transmission assembly is connected between the first impeller and the second impeller, and the first impeller and the second impeller are coaxially arranged. According to the noise reduction type disrotatory fog gun, long-distance water mist blowing can be achieved, the operation requirements of different scenes are met, noise can be effectively reduced, and noise pollution is relieved.

The invention relates to the technical field of pest control, and particularly discloses piercing-sucking type pest vibration interference equipment and an ultrasonic audio frequency orientation system thereof, the piercing-sucking type pest vibration interference equipment comprises an upper fixing plate and a lower fixing plate which are of an arc-shaped structure, and a vibration interference unit is fixedly installed between the upper fixing plate and the lower fixing plate. According to the piercing-sucking type pest vibration interference equipment and the ultrasonic audio frequency orientation system thereof, low-frequency interference signals and ultrasonic carrier signals are modulated on the basis of frequency spectrum characteristics of target pest interference signals, modulated ultrasonic signals are sent out through an energy converter (namely an orientation player) in the vibration interference unit, and then the target pest interference signals are sent out. The ultrasonic waves are self-demodulated into high-directivity interference signals in the air, and the interference signals are accurately transmitted to the edge position or the irregular dead angle area of the field, so that the interference signals of an omnidirectional player in the field are prevented from being attenuated to be invalid when reaching the edge position or the dead angle area of the field; the two players are matched with each other, so that the power of the internal omnidirectional player does not need to be greatly improved, and noise pollution is avoided.

The utility model provides a kind of sound insulation and noise reduction composite air pipe structure, it is related to composite air pipe technical field, including composite air pipe assembly, sound insulation component is provided on the composite air pipe assembly, the side of the composite air pipe assembly is provided with mounting assembly, the composite air pipe assembly includes air pipe main body and protective support cover.The utility model is by sound absorption box and is set in the inside of air pipe main body, cooperate sound absorption hole is favorable to absorb part noise, in turn is favorable to weaken part noise, by sound insulation board and is set in the outside of air pipe main body, it is favorable to further weaken noise, reduce its diffusion to outside, by both part is favorable to realize sound insulation and noise reduction, reduce noise transmission to external environment, in turn reduce noise pollution, by the outside of protective support cover is provided with buffer pad, it is favorable to absorb part vibration when air pipe main body operates, reduce vibration diffusion to building structure by support.

This invention discloses an intelligent aging cabinet for an automatic aging system in the audio industry, relating to the field of aging equipment technology. The aging cabinet body has an inlet and an outlet on opposite sides. A first and second isolating component intermittently unblocks either the inlet or outlet. During the process from when the audio product enters the aging station to when the aging cabinet body outputs the audio product that has completed the aging test, at least one of the first and second isolating components, together with the aging cabinet body, isolates the internal environment of the aging cabinet body from the external environment. This reduces noise pollution to the surrounding environment. Thus, while some audio products are still undergoing aging tests inside the aging cabinet, some audio products that have completed the aging test can be output from the aging cabinet body, while simultaneously inputting some audio products awaiting aging tests into the aging cabinet body. This shortens the waiting time for inputting and outputting audio products, resulting in higher overall efficiency when aging tests are performed on batches of audio products.

The utility model discloses a feed processing pulverizer which comprises an outer box, the top of the outer box is provided with a feeding hopper, the outer box is internally provided with a pulverizing assembly, and the pulverizing assembly comprises a mounting plate, a feeding pipe, a discharging pipe, a movable pulverizing disc, a movable pulverizing face, a rotating shaft, a static pulverizing disc, a static pulverizing face, an inner box and a main motor. The number of the mounting plates is two, the two mounting plates are symmetrically arranged front and back, an inner box is fixedly connected between the two mounting plates, and a feeding pipe is fixedly connected to the top of the inner box. The outer box, the feeding hopper and the crushing assembly are arranged, the space between the outer box and the inner box is filled with foam particles, generated vibration and noise can be absorbed in the crushing process, and therefore noise pollution is reduced, meanwhile, the crushing assembly is provided with a plurality of movable crushing discs and static crushing discs which are horizontally arranged, fine feed particles can be fully crushed, and the crushing efficiency is improved. And due to the arrangement of the upper layer and the lower layer, the crushing is finer.

The present invention relates to the production of a sound-insulating textile surface comprising two fabric layers laminated to each other with the coated surfaces remaining on the inner surface, while the fabric surfaces remain on the outer surface. Providing benefits such as preventing noise pollution, improving sound acoustics and increasing privacy in many sectors from construction sites to production facilities, from homes to offices, from automobiles to industrial areas. The versatility of this fabric offers significant advantages, both aesthetically and functionally.

The utility model relates to the technical field of magnetic core processing, in particular to a material pushing mechanism for magnetic core processing. The magnetic core machining pushing mechanism comprises a base, a connecting frame, a conveying belt, fixing plates, guide rods, springs, a pushing plate and the like, the connecting frame is slidably connected into the base, the fixing plates distributed front and back are fixedly connected to the top of the connecting frame, the conveying belt is rotatably connected to the outer portion of the connecting frame, and the pushing plate is slidably placed between the two fixing plates. The right side of the push plate is fixedly connected with symmetrically-distributed guide rods, the fixing plate is in sliding connection with the transversely-aligned guide rods, the guide rods are sleeved with springs used for assisting resetting, and the two ends of the springs are connected with the fixing plate and the guide rods respectively. The conveying belt is arranged to place the magnetic core, the magnetic core is pushed into the positioning mechanism of the machining equipment, the magnetic core can be prevented from being directly contacted with the base to be abraded, the integrity of the surface of the magnetic core is protected, noise can be prevented, and noise pollution in the working environment is reduced.

The utility model relates to the technical field of lubricating oil pumps, and discloses a lubricating oil pump for a gearbox, which comprises a shell, the top end of the shell is connected with a top cover through a magnetic component, the inner wall of the shell is fixedly connected with a sound insulation pad, the inner wall of the shell is fixedly connected with a pump body, and the left end of the pump body is provided with a driving shaft. A first oil inlet pipe is fixedly connected to the right end of the pump body, a first fixing ring is fixedly connected to the outer wall of the first oil inlet pipe, a second fixing ring is arranged at the right end of the first fixing ring, a second oil inlet pipe is fixedly connected to the inner wall of the second fixing ring, and first clamping rings are arranged on the outer walls of the first fixing ring and the second fixing ring. According to the lubricating oil pump, when the filter plate needs to be maintained and replaced, operation is easy and convenient, complex tools and professional skills are not needed, the maintenance time and cost can be saved, the maintenance efficiency of equipment is improved, the sound insulation pad is arranged on the inner wall of the shell, noise generated when the pump body operates is effectively absorbed, and noise pollution generated when the lubricating oil pump works is reduced.

The utility model discloses an air pump structure with a mute support, which relates to the technical field of air pump installation and comprises a base, an installation plate arranged on the top end face of the base, a bolt used for fixing arranged on the installation plate, an installation box fixedly connected to the installation plate, an air pump device arranged inside the installation box, and a vibration reduction component arranged at the top of the air pump device. A sound absorption component is arranged at the top of the air pump device, a supporting frame is welded to the bottom of the base, and a mute foot pad is installed at the bottom of the supporting frame. Through the arrangement of the vibration reduction assembly, the influence on other parts when the air pump device vibrates can be reduced, and noise generated by vibration when the air pump device works is reduced; through the arrangement of the sound absorption structure, noise generated when the air pump device works can be reduced, interference of the noise to the surrounding environment is reduced, a quiet working environment is created, the problem that a traditional air pump is serious in noise pollution is solved, and the air pump can be suitable for places with the high noise requirement.

The invention relates to the technical field of hub polishing, in particular to a rear axle hub special polishing device capable of preventing environmental pollution, which comprises a base, a second sound insulation layer is arranged on the base, a first sound insulation layer forming a double-layer structure with the second sound insulation layer is arranged in the second sound insulation layer, and a top cover is overturned on the second sound insulation layer. And a silencing mechanism is arranged on the second sound insulation layer, and the silencing mechanism comprises a rotating rod rotating at the center of the bottom of the second sound insulation layer. In the working process, an interlayer between the second sound insulation layer and the first sound insulation layer gradually tends to be in a vacuum environment, energy can be rapidly attenuated when sound waves are transmitted in an air rarefied medium, noise generated by polishing is rapidly attenuated, and the situation that workers are injured by the noise due to long-time work is avoided; and the pollution of noise to the environment is reduced.