Double-layer cylindrical shell vibration response simulation method and device

The invention provides a double-layer cylindrical shell vibration response simulation method and device, and belongs to the field of mechanical engineering.The method comprises the steps that the function relation of a double-layer cylindrical shell vibration displacement response model is determined; according to dimensional analysis, converting the parameters to obtain a scaling relational expression of which the dependent variable is the ratio of the vibration displacement response to the shell length and the independent variable is dimensionless; according to the scaling relational expression, obtaining a conversion relation between each control parameter of the double-layer cylindrical shell and a corresponding control parameter of the scaling model based on a similarity law; according to the actual control parameters and the conversion relation of the double-layer cylindrical shell, control parameters of the scaling model are obtained for vibration response simulation, and based on ...

Electric power anchor rod

The invention belongs to the technical field of electrical equipment installation, and particularly relates to an electrical anchor rod which comprises a ceramic tube and installation openings, the installation openings are formed in the two ends of the ceramic tube, a fixed threaded plate is fixedly arranged in the ceramic tube on one side of each installation opening, and a fixed threaded rod is arranged at the circle center of the fixed threaded plate in a threaded sealing fit mode. One end of the fixed threaded rod extends out of the outer end face of the mounting opening, the end, extending out of the outer end face of the ceramic tube, of the fixed threaded rod is connected with an opening drag hook, a sealing head is arranged on the outer end face of the mounting opening and located on the outer side of the fixed threaded rod, and the circle center of the sealing head is evenly provided with a plurality of first sealing rings in the linear direction; a plurality of springing bins ...

Keyword-statistic-based traffic event identifying method

The invention discloses a keyword-statistic-based traffic event identifying method. The method comprises the following steps of: 1) collecting historical information; 2) analyzing the type of a historical traffic event and traffic influence parameters; 3) extracting and classifying keywords in the historical traffic event; 4) acquiring statistic probabilities between the keyword in the historical traffic event and the event type and between the keyword in the historical traffic event and the traffic influence parameters; 5) automatically identifying the traffic event according to test data of the historical traffic event; 6) determining confidence coefficients of the probabilities for the type and the traffic influence parameters of the traffic event with each keyword; and 7) identifying a sudden traffic event in real time by using a matching statistic probability between the keyword and the traffic influence parameters and a confidence coefficient list. By the method provided by the invention ...

Seven-white (seven traditional Chinese medicines) freckle-removal moisturizing cream

The invention discloses seven-white (seven traditional Chinese medicines) freckle-removal moisturizing cream. The cream comprises the compositions according to the weight: 10g of seven-white freckle-removal moisturizing cream traditional Chinese medicine micro-powder, 12.5g of stearic acid, 17.0g of glycerol monostearate, 5.0g of bee wax, 75.0g of earth wax, 410.0ml of liquid paraffin, 67.0g of white vaseline, 10.0g of aluminum distearate, 1.0g of calcium hydroxide, 1.0g of ethylparaben and 401.5ml of distilled water, wherein the seven-white freckle-removal moisturizing cream traditional Chinese medicine micro-powder comprises the compositions in parts by weight: 30g of dahurian angelica roots, 30g of tribulus, 10g of bletilla, 30g of largehead atractylodes rhizome, 30g of Japanese ampelopsis roots, 15g of white poria and 30g of pearl powder. The seven-white freckle-removal moisturizing cream traditional Chinese medicine micro-powder is high in uniformity and easy to blend and coat, and ...

Automatic feeding device for forming and processing refractory bricks

The invention discloses an automatic feeding device for refractory brick forming machining. The automatic feeding device comprises a conveying device, a feeding box and a forming mold. The conveying device is driven by a PLC intelligent motor. The feeding box is installed on the fixing frame and located below the end of the conveying device. A feeding hole is formed in the top of the feeding box, a discharging hole is formed in the bottom of the feeding box, a lower cover movably connected with the side part of the feeding box is arranged at the discharging hole, and the lower cover is opened or closed by a controller; a pressure-sensitive sensor is installed at the bottom of the feeding box, and the pressure-sensitive sensor is in signal connection with the controller and is in wireless connection with the PLC intelligent motor. And the forming die is positioned below the discharge hole. The weight of each refractory brick is accurately controlled, and the quality of the refractory bricks ...

High-temperature solution polymerization process for copolymerization of ethylene and alpha-olefin

The invention provides a process for preparing a polyolefin elastomer by copolymerization of ethylene and alpha-olefin, a specific feeding mode is adopted, part of ethylene monomer, alpha-olefin, a solvent and a cocatalyst are mixed in a static mixer and then enter a polymerization reaction kettle together with a catalyst, so that the mass transfer time is prolonged; ethylene is uniformly dispersed and the impurity removal effect is improved, so that the activity of the catalyst is improved; particularly, a tubular reactor and a tank reactor are connected in series, so that the conversion rate of ethylene and alpha-olefin can be effectively increased, and the reaction system is relatively stable; the tubular reactor and the tank reactor are combined, so that the heat exchange area is large, the reaction heat can be better removed, and the reaction is stable. The reactor has the advantages of high catalytic efficiency, avoidance of multi-kettle reaction, large heat exchange area, high conversion ...

Two-stage anaerobic membrane bioreactor

The invention discloses a two-stage anaerobic membrane bioreactor the main body of which is of a cylindrical tank structure, wherein a water distribution pipe is arranged at the bottom of a reaction chamber, and a fixed support is arranged at the upper part of the reaction chamber; a methane collector and inclined plates are fixed on the fixed support, the methane collector is formed by combiningfour opposite inclined plates together, and a methane collecting pipe is arranged at the upper part of the methane collector; the upper part of the reaction chamber is equipped with an annular effluent weir which is made of steel, stainless steel or reinforced concrete and is fixed on the main body, the water distribution pipe is arranged at the bottom of the reaction chamber, and the steel fixedsupport is arranged at the upper part of the reaction chamber; a membrane component is fixed on the fixed support and is composed of a membrane framework and a membrane element in the framework; an annular ...

Novel no steel ring mouldable formula brassiere

The utility model discloses a novel no steel ring mouldable formula brassiere, including down hold in the palm line, brassiere cup, can dismantle joints, folding cloth, baldric, side wing piece and moulding cotton enclose, the upper surface that holds in the palm the line down is equipped with brassiere cup and folding cloth, and folding lay put hold in the palm the line under on the middle part on surface, the brassiere cup includes that the lower breast holds in the palm and holds in the palm with last chest, and the lower breast asks fixed connection in the upper end of last chest support, the surface of brassiere cup is equipped with moulding cotton circle, and the last fixed surface of brassiere cup is connected with the junction the upper surface of junction is equipped with can dismantle the joint, and the junction is connected with the baldric through dismantling to connect. This novel no steel ring mouldable formula brassiere holds in the palm and to hold in the palm with last ...

Industrial process of producing xylanase with Aspergillus usamii

Traditional Chinese medicine instant granules for resisting HPV and improving immune functions and preparation method thereof

The invention discloses traditional Chinese medicine instant granules for resisting HPV and improving immune functions and a preparation method thereof, belonging to the technical field of traditional Chinese medicines. The traditional Chinese medicine instant granules for resisting HPV and improving the immune functions consist of astragalus membranaceus, manyflower solomonseal rhizome, prepared radix rehmanniae, Chinese dodder seeds and prepared rhubarb according to a mass ratio of 3:3:2:2:1 in sequence. The traditional Chinese medicine instant granules take astragalus membranaceus, manyflower solomonseal rhizome and prepared radix rehmanniae according to a mass ratio of 3:3:2 for medicine use, have significant functions of resisting virus and enhancing the body immunity, can be used for treating various viral skin diseases such as verruca vulgaris, toe wart, verruca plana and condyloma acuminate, and can be used for shortening the disease course and effectively reducing recurrence. According ...

Recyclable garbage sorting device

The invention belongs to the field of garbage sorting, and provides a recoverable garbage sorting device which comprises a drum screen, a sorting device and a sorting device, one end of the conveying mechanism is arranged below the drum screen; the infrared sensor is arranged on the drum screen and is used for triggering the alarm to send out an alarm signal under the condition that living animals exist in a preset range of the drum screen; the suspension type electrostatic generator is arranged above the conveying mechanism; the flat plate type metal detector is arranged below the conveying mechanism and used for sending the position information of the metal garbage; the clamping manipulator is arranged above the conveying mechanism and is used for clamping the metal garbage; and the winnowing equipment is arranged at the other end of the conveying mechanism. The problems that living animals enter garbage treatment to cause harm and interfere with subsequent component separation can be ...

Paper cup defect detection method and device

The invention provides a paper cup defect detection method and device, and belongs to the field of product detection, and the method comprises the steps: obtaining a to-be-detected paper cup image; inputting the paper cup image into the trained detection model, and outputting a defect detection result of the paper cup; wherein the detection model is a YOLO v5 network model, a CBAM module is added behind the last layer C3 module of the Backbone part, a weighted bidirectional feature pyramid network is used for feature fusion in the Neck part, a fourth-scale detection layer is constructed on an output layer, and training is carried out according to a paper cup image training sample marked with a defect label; wherein the dimension of the fourth dimension detection layer is larger than the dimensions of the other three original detection layers. According to the method, the expression ability of defect features in a complex environment is improved, the fusion ability of the features is enhanced ...

Maleic acid acrylamide copolymer hydrogel and preparation method thereof

The invention relates to the field of hydrogel preparation, in particular to maleic acid acrylamide copolymerized hydrogel and a preparation method thereof. The preparation method of the maleic acid acrylamide copolymerized hydrogel comprises the following steps: S1, mixing a hydrogen bond donor, a hydrogen bond acceptor and a cross-linking agent, and stirring at 70-100 DEG C until a transparent and clear liquid is obtained, so as to obtain a deep eutectic solvent; s2, adding an initiator and maleic acid into the deep eutectic solvent at the temperature not lower than 32 DEG C, uniformly stirring to form a mixture solution, transferring the mixture solution into a tubular reactor, and preparing polymer gel by adopting a thermal-initiated front-end polymerization technology; s3, soaking and washing the polymer gel, and freeze-drying to obtain the maleic acid acrylamide copolymerized hydrogel. According to the method, copolymerization of a low-activity monomer and a high-activity monomer ...

Multifunctional travel suitcase

The invention relates to a multifunctional travel suitcase, and relates to a suitcase for travelling. The multifunctional travel suitcase is composed of a rotary box, a base box and lateral plates and is characterized in that the lateral plates are arranged at two sides of the base box; the rotary box is arranged at the upper part of the base box between the two lateral plates; an outer zipper is arranged on the tops of the base box and the rotary box, so that the base box and the rotary box are connected together; the rotary box is hinged with the lateral plates through a rotating shaft; a box zipper is arranged at the inner sides of the base box and the rotary box; the lateral plates are made of a hard material; and the lateral plates as the back plates of the base box and the rotary box are made of a hard material. The multifunctional travel suitcase disclosed by the invention has the characteristics of being novel in structure, simple and convenient to process, convenient to use, low ...

Novel dynamic vibration absorber optimization design method and device

The invention provides a novel dynamic vibration absorber optimization design method and device, and relates to the field of mechanical engineering.The method comprises the steps that a motion differential equation set of a vibration absorber system is determined according to the connection relation of elements in the vibration absorber system, and the motion differential equation set is converted into a regularization motion differential equation set according to an improved time scale and design parameters to be optimized; converting the regularized motion differential equation set into a first-order state equation according to a system state variable, and determining a corresponding output equation according to an optimization design target; performing H-infinity optimization calculation according to the first-order state equation and the output equation; the improved time scale is determined according to the natural angular frequency of the controlled vibration mode of the main system ...

Two-stage anaerobic membrane bioreactor

The invention discloses a two-stage anaerobic membrane bioreactor the main body of which is of a cylindrical tank structure, wherein a water distribution pipe is arranged at the bottom of a reaction chamber, and a fixed support is arranged at the upper part of the reaction chamber; a methane collector and inclined plates are fixed on the fixed support, the methane collector is formed by combining four opposite inclined plates together, and a methane collecting pipe is arranged at the upper part of the methane collector; the upper part of the reaction chamber is equipped with an annular effluent weir which is made of steel, stainless steel or reinforced concrete and is fixed on the main body, the water distribution pipe is arranged at the bottom of the reaction chamber, and the steel fixed support is arranged at the upper part of the reaction chamber; a membrane component is fixed on the fixed support and is composed of a membrane framework and a membrane element in the framework; an annular ...

Plastic product edge cutting process

The invention provides a plastic product edge cutting process applied to the field of cutting, and the cutting process effectively realizes the conversion of plastic pipe cutting from a shearing and extruding process to a straight cutting process through the arrangement of the steps of extruding, pushing and clinging and a full-cycle micro-cutting process. The tearing effect of a cutter on the end face of the cutting edge of the plastic pipe in the cutting process is reduced, the cutting efficiency and the cutting quality of the plastic pipe are improved, the cutting difficulty is reduced, meanwhile, the probability of deformation and galling of the cutting edge of the plastic pipe can be effectively reduced, the damage degree of the plastic pipe is reduced, and the use performance of the plastic pipe is effectively guaranteed. And the service life of the connection at the cutting edge is prolonged.