34results about How to "Good noise canceling" patented technology

Due to variations arising during manufacturing, axial fans often are slightly imbalanced, resulting in noise during operation, which is undesirable in many contexts, for example when the fan is used for ventilation purposes in a motor vehicle. A fan with improved vibration and noise damping can be achieved by elastically suspending the fan wheel within a first ring formed of a hard plastic, the first ring having a tubular extension formed of a softer plastic, and serving to mechanically connect the first ring to a surrounding annular carrier part. Optionally, the first ring and extension unit can include a spring element. Preferably, the first ring and tubular extension are produced by a multi-component forming technology such as two-plastic technology. The fan is preferably driven by an electronically commutated motor (ECM).

The invention discloses a rescue cabin for coal mine development, which includes a cabin body, side doors are hinged on the left and right side walls of the cabin body, handles are connected to the side doors, and supports are longitudinally arranged inside the cabin body Beam, the top of the support beam is provided with a first reinforcement rib, the bottom end of the support beam is provided with a second reinforcement rib, a hydraulic cylinder is provided between the support beam and the side door, and the two ends of the hydraulic cylinder are respectively It is connected to the support beam and the side door through the rotation of the pin shaft. A sleeve is uniformly arranged in the middle of the bottom of the cabin, and the top of the sleeve is opened. The inside of the sleeve is provided with a spring, and the top of the spring is connected with a A guide column, the top of the guide column is fixedly connected with a bed body, a first aid box is provided at the bottom of the bed body, a battery pack is provided on the left side of the first aid box, and an oxygen cylinder is provided on the right side of the first aid box , an LED light is installed in the middle of the top of the cabin, which is suitable for widespread promotion.

The invention discloses a multi-view dense point cloud data fusion method based on a two-sided filter and belongs to the technical field of optical three-dimensional non-contact measurement. The multi-view dense point cloud data fusion method based on the two-sided filter comprises the steps that (1) multi-view dense point cloud data are input, (2) a topological relation is established, (3) point data classification is conducted based on the two-sided filter, (4) Mean-shift clustering fusion is conducted, and (5) a fusion result is output. When the method is used for fusing the multi-view dense point cloud data, the two-sided filter and the Mean-shift clustering are introduced, recognition of an overlapping region and a non-overlapping region is not needed, in this way, the efficiency of fusing a great number of multi-view dense point cloud data is improved, the smoothness of a point cloud obtained after fusion are improved, and the defects of an existing point cloud fusion technology are effectively overcome.

The invention discloses an environmentally friendly ceramic raw material crushing device. The device includes a crushing barrel and a supporting frame. The crushing barrel is located on the supportingframe. The top of the crushing barrel is provided with a charging opening. A cover matching the charging opening is arranged at the charging opening. A first-stage crushing device is arranged in theupper part of the crushing barrel. A vibrating screen plate is arranged under the first-stage crushing device. The vibrating screen plate is located at the middle part of the crushing barrel. A second-stage crushing device is arranged in the bottom part of the crushing barrel. A swinging screen plate is arranged on the bottom of the second-stage crushing device. An annular baffle plate is arrangedbetween the second-stage crushing device and the vibrating screen plate. The baffle plate is inwardly inclined and is of a funnel shape with large top and small bottom. The upper edge of the baffle plate is fixedly connected to the inner wall of the crushing barrel. The wall of the crushing barrel is of a double-layer structure. The space between the two layers of walls of the crushing barrel isfilled with noise reducing cotton. The bottom of the crushing barrel is provided with a discharging opening. According to the invention, multiple crushing can be carried out in the same device, and the environmentally friendly ceramic raw material crushing device has a good crushing effect and a good noise reduction function and effectively improves the production environment of workers.

The invention discloses a crushing multistage screening device for building gravel aggregate, and belongs to the technical field of screening devices. The crushing multistage screening device comprises a screening box, a first filter plate is arranged at the top end of the screening box, a feeding hopper is arranged in the middle of the upper surface of the screening box, the top end of the screening box is further provided with a driving motor, the output end of the driving motor is provided with crushing cutters, the two sides of each crushing cutter are provided with first crushing teeth, the bottom end of the screening box is provided with a screening mechanism, the screening mechanism comprises a second supporting plate, a second filter plate is arranged above the second supporting plate, a first hydraulic cylinder corresponding to the second filter plate is arranged at one end of the upper surface of the second supporting plate, and a third filter plate is arranged above the second filter plate. The crushing multistage screening device has the advantages that the structure is simple, the use is convenient, the crushing function is good, the gravel can be crushed according tothe actual use requirements of the user, the functions of the screening device are richer, and the production efficiency of the user is improved.

The invention belongs to the technical field of image processing, and discloses an image processing method, system, medium and device based on a sparse auto-encoder, and the method comprises the stepsof presetting the deviation of all neural networks as a given vector or matrix, and carrying out the continuous updating; introducing a cognitive feedback weight matrix into the deviation, and improving the accuracy of the sparse auto-encoder network by utilizing the feedback deviation; controlling the sparse auto-encoder based on a regularization method of the H1 norm. The invention discloses adenoising sparse auto-encoder based on feedback deviation and H1 regularization. In the model, a feedback bias matrix is introduced, so that the bias of the network can be more accurately controlled.The feedback deviation changes with the number of iterations. H1 regularization can reduce overfitting and can also prevent more important features from being excessively smoothed. Experimental results show that the method is effective and is superior to the existing DnCNN-3, DAEP and EPCNN methods.

The invention discloses a polishing device for metal surface treatment and belongs to the technical field of metal surface treatment. The polishing device comprises a shell, wherein a polishing mechanism is arranged at the top end of the shell; the bottom end of the polishing mechanism is fixedly connected with the shell in a welding manner; a fixing mechanism is arranged in the shell and comprises a second support plate; a first support plate is arranged above the second support plate; support pieces are arranged at the two ends of the upper surface of the second support plate; an electric telescopic rod is arranged at the top ends of the support pieces; a second limiting plate corresponding to the electric telescopic rod is arranged at the two ends of the lower surface of the first support plate; and a limiting base is arranged above the first support plate. The polishing device is simple in structure and convenient to use, has an excellent fixing function, and can adjust the workpiece position during the polishing process to realize a better polishing effect to the workpiece and improve the working efficiency of a user.

The invention discloses an environment-friendly treatment device for waste paper regeneration. The invention belongs to the technical field of environmental protection equipment. The device includes afirst support plate, wherein a crushing box is arranged on the upper surface of the first supporting plate; discharge pipes are arranged on the two sides of the crushing box; a crushing mechanism isarranged above the first supporting plate and comprises a second supporting plate, a supporting piece is arranged at the joint of the second supporting plate and the first supporting plate, water outlet pipes are arranged at the two ends of the lower surface of the second supporting plate, a third supporting plate is arranged below the second supporting plate, and a driving motor is arranged on the upper surface of the third supporting plate. The device is simple in structure, convenient use, when the waste paper treatment device is used, waste paper and water are mixed while the waste paper is crushed through mutual cooperation of the crushing part and the stirring part, and secondly, the waste paper can be crushed through the crushing part at different heights and can be ground, so thatthe waste paper crushing effect of the treatment device is better, and the production efficiency of a user is improved.

The invention discloses a bonding riveting installation structure of a composite top cover used for a rail traffic vehicle and belongs to the technical field of rail traffic vehicle light weight and passive safety. The structure comprises the composite top cover and a vehicle body upper suspension girder. The upper surface on the inner side of the vehicle body upper suspension girder is of a three-level stair structure, the outer side of the vehicle body upper suspension girder is made of a metal section of an inequilateral right-angle structure, the lower surface of the side edge of the composite top cover is of a two-level stair structure, a one-level stair structure of the lower surface of the side edge of the composite top cover and a two-level stair structure of the upper surface on the inner side of the vehicle body upper suspension girder are bonded through sealant, and elastic glue is arranged between the one-level stair structure of the lower surface of the side edge of the composite top cover and the three-level stair structure of the upper surface on the inner side of the vehicle body upper suspension girder which are connected through rivet nuts and bolts; and the rivetnuts are embedded in the one-level stair structure of the lower surface of the side edge of the composite top cover, and bolt holes matched with the rivet nuts are formed in the corresponding positions on the three-level stair structure of the vehicle body upper suspension girder. The structure is suitable for being applied and popularized in the technical field of rail traffic vehicle light weight and passive safety.

The invention discloses a noise reducing extractor hood. The extractor hood comprises a crate; the crate is provided with a fume collecting cavity; a draught fan device is installed inside the fume collecting cavity; a first noise reducing structure is arranged between the crate and the draught fan device; the first noise reducing structure comprises a first thin fill close to the draught fan device and a second thin film close to the inner wall of the fume collecting cavity; and a sealed first noise reducing cavity is formed between the first thin film and the second thin film. In the operation process of the extractor hood, a noise sound wave generated by operation of the draught fan device enters the first noise reducing cavity through the first thin film, and exits through the second thin film; under resonance action of the first thin film and the second thin film as well as the first noise reducing cavity, a sound absorption bandwidth is expanded and can absorb sound waves of different frequencies so the sound waves of different frequencies can be absorbed and reduced effectively; and the sealed first noise reducing cavity can effectively prevent fume from entering, working environment of the extractor hood is satisfied, and a good noise reducing function is maintained.

The invention provides a discharging device for a high-efficiency rolling noise reduction type industrial machine. The discharging device comprises a motor, a conveyer belt, a discharging hole, a hollow box, a feeding plate, a feeding hole, hollow barrels, T-shaped rods I, springs I, an L-shaped material plate, T-shaped rod IIs, springs II and a columnar tank, wherein the motor is fixed at the right end of the hollow box; the discharging hole is formed in the lower part of the front end surface of the hollow box; the conveyer belt is arranged in the discharging hole; the feeding plate is arranged below the feeding hole; the hollow barrels are arranged at the left part and right part of the upper end surface of the interior of the hollow box; the T-shaped rods I are connected to the hollowbarrels through the springs I; the T-shaped rods II are arranged at the four corners of the lower end surface of the T-shaped rods II; and the lower ends of the T-shaped rods II are connected to the columnar tank through the springs II. The discharging device realizes the buffering of processing products; the working noise of the discharging device is substantially reduced; and the discharging device is convenient to use and low in construction cost and has an excellent noise reduction function and high reliability.

The invention relates to a polyurethane plate, and particularly provides a heat preservation and sound insulation polyurethane plate. The heat preservation and sound insulation polyurethane plate comprises an upper color plate and a lower color plate. The lower surface of the upper color plate is connected with a polyurethane core layer. A sound adsorption layer is arranged on the lower surface of the polyurethane core layer. A heat preservation material plate is arranged between the sound adsorption layer and the lower color plate and is thinner than the polyurethane core layer. At least two sound adsorption grooves are formed in the surface, making contact with the upper color plate, of the polyurethane core layer. The lengths of the sound adsorption grooves and the length of the polyurethane core layer are consistent. A plurality of through holes are formed in the surface, opposite to the sound adsorption grooves, of the upper color plate. Sound adsorption holes are formed in the bottoms of the sound adsorption grooves and are connected with the sound adsorption layer. The heat preservation and sound insulation polyurethane plate provided by the invention is simple in structure, low in weight, high in structural strength, close in connection, good in heat preservation performance and capable of adsorbing sound and reducing noise. A preparation method of the polyurethane core layer is simple in manufacturing process and high in production efficiency, and the prepared polyurethane core layer is good in heat preservation performance and high in heat conductivity.