204results about How to "Moderate length" patented technology

A polyurethane caulking material for expansion joints of a ballastless track of a high speed railway is disclosed. The caulking material is prepared from two parts A and B. the part A is composed of the following raw materials, by weight, 100 parts of isocyanate and its prepolymer, 10-150 parts of a plasticizer, 5-150 parts of a solid filler, 1-20 parts of a diluents, 1-5 parts of an adhesion promoter, 0-10 parts of a thixotropic agent and 1-3 parts of a water-removal agent. The part B is composed of the following raw materials, by weight, 10-20 parts of modified polyhydric alcohol, 1-5 parts of a diluent, 2-30 parts of a plasticizer, 5-30 parts of a solid filler, 0-5 parts of a thixotropic agent, 0.5-2 parts of an antifoaming agent, 0.1-1 part of an anti-aging agent and 0-0.01 part of a catalyst. The mass ratio of the part A to the part B is 4:1-10:1. The polyurethane caulking material has advantages of good low-temperature curing performance, high displacement capability, low tensile modulus, good bond property and excellent endurance quality and fatigue resistance, and is suitable for expansion joints of a ballastless track of a high speed railway as well as expansion joints of roads and airfield runways.

The invention relates to a portable rechargeable electric welding machine. The portable rechargeable electric welding machine solves the problems that no-load voltage between trigger weld handles of an existing generating electric welding machine threatens personal safety, the electric welding machine is not within a visibility range of a welder, and safety of an intermediate link is uncontrollable. Five groups of batteries are adopted to serve as a direct-current power source, are in series connection to form a 320V direct-current welding power supply mode, and are in parallel connection to form a non-welded mode. A sixth group of batteries are arranged in a casing and are connected with an alternating current output end through an inverter. A welding module comprises an inversion power output circuit, a transformer, an output rectifying circuit and a main control unit. The direct-current power source is connected with the inversion power output circuit, the inversion power output circuit is connected with the transformer, and the transformer is connected with the output rectifying circuit. Battery packs serve as the direct-current power source, an external power source is not used, the electric welding machine can be placed within a safety rang of an electric welding position, a weld line length is appropriate, pull of a weld line is avoided, danger is avoided, and the electric welding machine is always within the visibility range of the welder, is in a controllable state and is high in safety.

The invention discloses a blast hole explosion blocking method. The method includes the following construction steps that a, buffering air bags are obtained and are each of a cylindrical structure; b, an explosive is arranged at the middle portion in a blast hole, so that an explosive containing section is formed, then the blast hole is blocked through drilling cuttings, and therefore a dense blocked section is formed; c, the buffering air bags obtained in the step a are sequentially placed in the blast hole, so that a buffering air bag set is formed; d, the step b and the step c are finished repeatedly, so that dense blocked sections and the buffering air bags are arranged alternately; e, the blast hole is blocked through the drilling cuttings, blockage work of the remaining portion of a hole opening is finished, and the last dense blocked section is formed. According to the construction method, due to the fact that the buffering air bag set occupies a large space, the use number of blocking materials is reduced, and labor intensity of workers is relieved; the acting time of explosion gas in the blast hole can be prolonged, so that the explosion crushing effect is improved, the blast hole is effectively prevented from being punched, and the explosion operation safety level is improved.

The invention relates to colored regenerated polyester staple fibers and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out reactive melting and blending on reclaimed polyester and a polyester oligomer melt to obtain a primary depolymerized melt; then carrying out alcoholysis reaction on the primary depolymerized melt and ethylene glycol to obtain a deep depolymerized melt; then carrying out TVOC (Total Volatile Organic Compound) removal and cracking functional group repairing on the deep depolymerized melt to obtain a low-TVOC-content polyester oligomer melt; then carrying out condensation polymerization on the low-TVOC-content polyester oligomer melt to obtain a low-TVOC-content regenerated polyester melt; finally, controlling color matching of the low-TVOC-content regenerated polyester melt by a computer color matching system to obtain a colored regenerated polyester melt; enabling the colored regenerated polyester melt to enter a melt direct spinning system to prepare the colored regenerated polyester staple fibers. The finally prepared colored regenerated polyester staple fibers provided by the invention have relatively small color aberration; the content of TVOC is 30ppm to 300ppm and the content of nonylphenol and isomers thereof is 80ppm to 200ppm.

The invention discloses a fluorescence in situ hybridization method for metaphase chromosome of mulberry. The fluorescence in situ hybridization method comprises the following steps: the enzymolysis wall degaradation hypotonic flame drying method is adopted to prepare a chromosome slide sample, so that a high-quality mulberry chromosome flake can be obtained; then 5S rDNA and 25S rDNA probes are prepared, and the probes are in repetitive sequence, strong in fluorescence signal, easy to detect and high in repeatability; finally, fluorescence in situ hybridization of the chromosome is conducted to obtain the mulberry chromosome in complete form. The fluorescence in situ hybridization method can be used for mulberry chromosome identification and structure research, and provides a new way for evolution research and the like of mulberry.

The invention relates to biodegradable regenerated polyester and a preparation method thereof. First polyester reclaimed materials and polyester low polymer melt react to obtain preliminary depolymerization melt, and then the preliminary depolymerization melt and ethylene glycol react to obtain deep depolymerization melt, the deep depolymerization melt and ethylene glycol steam perform convection flow to obtain low TVOC content polyester oligomer melt, aliphatic divalent polyether esterification product is prepared, the polyester oligomer melt and the aliphatic divalent polyether esterification product undergo pre-condensation reaction to obtain low TVOC content precondensible polyester melt, the precondensible polyester melt undergoes final polycondensation reaction to obtain low TVOC content regenerative polyester melt, and finally the low TVOC content regenerative polyester melt enters a melt cooling pelleting system to obtain the biodegradable regenerated polyester. The method is moderate in overall process flow length and process control difficulty and has high efficiency, and the content of TVOC and nonylphenol and an isomeride thereof in the finally made biodegradable regenerated polyester is low.

The invention relates to a portable electric welding machine which solves the problems that a motor-generator welder which is used in existing electric power engineering construction causes floating voltage between weld handles and threatens personal safety, the motor-generator welder is not in a range of visibility of an electric welder, and safety of intermediate links are uncontrollable. The portable electric welding machine comprises an outer shell and a rectification and filtration module arranged inside the outer shell, a battery pack arranged inside the outer shell is used as a direct-current power source, the battery pack is connected with a direct/alternating inverting module, the direct/alternating inverting module is connected with the rectification and filtration module, the rectification and filtration module is connected with an insulated gate bipolar translator (IGBT) power switch element to conduct frequency modulation on direct current, and the IGBT power switch element is connected with a weld module. The battery pack is used as a direct current power source, an external power source is not needed, the portable electric welding machine can be placed in a safe range of an electric welding position, the length of a weld line is quite proper, a site of messy weld lines does not occur, dangers are prevented from happening, the portable electric welding machine is located in the range of visibility of the electric welder all the time and is in a controllable state, and therefore safety is high.

The invention relates to a polyester reclaimed material recycling method. First a polyester reclaimed material and polyester oligomer melt undergo reaction melt blending to obtain preliminary depolymerization melt, the preliminary depolymerization melt is mixed with ethylene glycol to perform alcoholysis reaction to obtain deep depolymerization melt, the deep depolymerization melt is filtered and then undergoes TVOC desportion and cracking functional group restoration in a vertical reactor to obtain a low TVOC content polyester oligomer melt with the TVOC content smaller than 20 ppm, the low TVOC content polyester oligomer melt undergoes condensation polymerization to obtain low TVOC content regenerative polyester melt, and finally the low TVOC content regenerative polyester melt enters a melt cooling pelleting system to obtain a regenerative polyester chip. The method is moderate in overall process length and process control difficulty and has high efficiency, and the content of TVOC, nonylphenol and an isomeride thereof in the finally obtained regenerative polyester chip is low.

The invention relates to a cage-type wire twisting machine capable of accurately measuring meter, comprising a twisted cage, a wind up seat, a driving device, a take-up reel and electric equipment, wherein, the twisted cage, the wind up seat, the driving device and the take-up reel are fixed in contraposition mode, wherein, the electric equipment comprises a meter measuring device and a transducer module; the meter measuring device is arranged between the wind up seat and the driving device; the meter measuring device is electrically connected with the transducer; the two output ends close to switches in the meter measuring device are respectively connected with the input ends of the two counter units; the output ends of the two counter units are respectively connected with a multifunctional input terminals of the transducer; and the reset ports of the two counter units are respectively connected with a reset switch. The cage-type wire twisting machine provided by the invention has simple structure and low cost; the counter unit A is cooperative with the counter B to work, when the cable marker reaches the take-up reel, the cage-type wire twisting machine can automatically halt, counting error can not generate because of the distance between the meter measuring device and the take-up reel, thus ensuring the length of the cable wound on a spool, enabling the product to satisfy the requirements of users, and saving the cable materials.

The invention discloses a gene chip for detecting 15 clinical common pathogenic microorganisms. The gene chip comprises specific detection probes fixed on a solid phase vector, wherein the probes are designed for 16SrRNA gene and ITS gene sequences of staphylococcus aureus, klebsiella pneumoniae, pseudomonas aeruginosa, proteus mirabilis, Escherichia coli, shigella, enterobacter aerogenes, pseudomonas fluorescens, candida albicans, candida glabrata, candida tropicalis, candida parapsilosis, aspergillus terreus, aspergillus flavus and rhizopus oryzae, and screened and verified by repeated tests, and have high hybridization specificity and accuracy. The chip provided by the invention ensures simple detection operations and relatively lower cost, saves time, is applied to the screening of the clinical common pathogenic microorganisms, the early rapid diagnosis of critical patients and the diagnosis of suddenly occurring infection event pathogens and favorable for clinically rapidly diagnosing infection sources and functions in the early detection and early diagnosis of clinical diseases.

The invention discloses an interface modification method of a lithium battery composite single crystal positive electrode material. The method comprises the following steps: 1) preparing an acrylonitrile monomer solution, adding a photoinitiator into the acrylonitrile monomer solution, atomizing the monomer solution, spraying the atomized monomer solution on the surface of the single crystal positive electrode material, and placing the treated positive electrode material in a mechanical fusion machine for fusion; 2) in a mechanical fusion machine, carrying out the polymerization reaction on the fused material under the irradiation of an ultraviolet lamp, and uniformly coating the surface of the positive electrode material with an ionic liquid monomer; 3) after the polymerization reaction is finished, placing the polymer-coated positive electrode material in a tubular furnace, and carrying out heat treatment at 150-300 DEG C to obtain the composite single crystal positive electrode material with the modified interface. After interface modification, the surface of the single crystal positive electrode is uniformly coated with the polymer, so that the contact area of the battery positive electrode material and the electrolyte can be reduced, side reaction and corrosion are avoided, the cycle life of the single crystal positive electrode material is prolonged, the rate capability of the single crystal positive electrode material is improved, and the single crystal ternary positive electrode material with excellent comprehensive performance for the lithium battery is obtained.

The invention relates to a tobacco stem sorting device for tobacco stem shredding. The device is composed of a vibrating feeder 1, a stem sorting screen plate 2, a longitudinal partition board 4, a material level control system 6 and a stem sorting machine vibrating groove 7. When the tobacco stem sorting device is matched with a tobacco stem shredding machine, tobacco stem sorting is achieved before shredding, cut stems are proper in length and are neither too long nor too short, thickness is even, cut stems are more reasonable in structure and more close to cut tobacco in form, and blending uniformity is high in cigarettes.

The invention discloses a rotor profile of a double-screw compressor. The rotor profile of the double-screw compressor comprises a male rotor profile (1) and a female rotor profile (2). The rotor profile is characterized in that teeth of a male rotor and a female rotor are bilateral asymmetric teeth taking a pin tooth arc, a circular arc, an arc enveloping curve, an ellipse, an ellipse enveloping curve and a rolling arc secondary curve as basic constitutional units. By adopting the rotor profile of the double-screw compressor, the efficiency of a main machine of the screw compressor can be improved by 4%, and the input specific powder of a whole unit achieves the first level of energy efficiency in the national standard.

The invention discloses zooplankton rrnL gene amplification primers and a screening method, application and an application method thereof, and belongs to the biotechnical field. According to common zooplankton rrnL gene sequences, 9 PCR (polymerase chain reaction) amplification primers are designed, comprising 5 upstream primers and 4 downstream primers; the primers have wide coverage and high amplification efficiency for zooplankton, and PCR products of the primers are compatible with a high-throughput sequencing platform; after the upstream primers and the downstream primers are combined in pairs, products with the lengths of 190-390 bp can be amplified; by a multi-primer combination method, nonspecific amplification can be reduced and the success rate of PCR can be improved; the PCR products can be widely used for performing species identification, biodiversity analysis and other researches through Barcode sequences.

The invention relates to a device for manufacturing a tubular lampshade and a manufacture method. The device comprises an opening die for being installed on a head of an extruder, wherein die cavities for molding a tubular lampshade are arranged in the opening die and connected with material flow channels arranged in the opening die. The device is characterized that the die cavities comprise three parts, namely the independent first molding cavity for molding the transparent part of the lampshade as well as the second die cavity and the third die cavity for molding the residual part of the lampshade, wherein the section of the third die cavity is same with the section of the lampshade to be molded; the two material flow channels are not communicated, an outlet of the first material flow channel is connected with the first die cavity and positioned above the first die cavity, and an outlet of the second material flow channel is connected with the second die cavity and positioned below the second die cavity. The manufacture method comprises the following steps: respectively simultaneously charging transparent prescription materials and opaque prescription materials into different material flow channels and integrally molding the tubular lampshade with a transparent part and an opaque part. Compared with the prior art, the invention can integrally extrude and mold the tubular lampshade with the residual part of the transparent part and the opaque part and has favorable seal effect.

The invention provides a polycarboxylic acid water reducing agent used for a polyether with a molecular weight of 1200 and a preparation method of the polycarboxylic acid water reducing agent. The polycarboxylic acid water reducing agent comprises the following components in parts by weight: 310-330 parts of a polyether macromonomer with a molecular weight of 1200, 4-14 parts of acrylic acid, 2-9parts of a carboxylate monomer, 2-5 parts of a fluoro functional monomer, 0.9-1.8 parts of hydrogen peroxide, 4-10 parts of a flexible chain monomer, 0.32-0.5 part of a reducing agent, 0.3-0.7 part ofa chain transfer agent, 6-10 parts of a neutralizing agent, and the balance water, wherein a total mass is 1000 parts, and after preparation is performed, a mass fraction of a finished product is 40%, and an acid-ether ratio is 2.7-3.3. The method is performed according to the following steps: 1, material addition for the first time; 2, addition of the hydrogen peroxide; 3, addition of a solutionA and a solution B; and 4, preparation of the finished product. The polycarboxylic acid water reducing agent and method provided by the invention adopt the polyether monomer with the molecular weightof 1200 as a raw material to obtain a suitable side-chain length which can be stretched in the environment, and the problem of weaken steric hindrance brought by a short side chain is compensated.

The invention provides an electric pole assembly capable of being dismounted rapidly and an assembling method thereof, and relates to the technical field of electric power equipment. The electric pole assembly capable of being dismounted rapidly comprises a body. A cylindrical boss is arranged at the upper end of the body. A tenon is arranged on the cylindrical boss. A cylindrical groove is formed in the lower end of the body. A mortise is arranged above the cylindrical groove. The shape and size of the cylindrical boss are matched with the shape and size of the cylindrical groove, and the shape and size of the tenon are matched with the shape and size of the mortise. A cable hole is formed in the central axis of the body. Pin holes with the same size are formed in identical positions of the cylindrical boss and the cylindrical groove and used for mounting a cement pin, the two ends of the cement pin are each connected with a protective gasket and a cement nut in sequence, and each protective gasket is of an arc-shaped structure. A construction rope fixing pile is arranged on the outer wall of the body. The electric pole assembly capable of being dismounted rapidly is reasonable in structure, proper in size, convenient to transport and capable of being dismounted and assembled easily and rapidly, and the joint is firm and safe; and the production process is simple, the cost is low, and the electric pole assembly capable of being dismounted rapidly and the assembling method thereof are suitable for being used and popularized widely.

The invention discloses an automatic control device for reducing header loss of a wheat harvester and a control method of the automatic control device. The automatic control device is used in cooperation with a rack, a header, a cutting knife, an auger, a reel, a reel support, a reel lifting oil cylinder and a reel driving motor of the harvester, and comprises a running speed sensor, a header height sensor, a reel height sensor, a reel rotating speed sensor and a crop height detection device, wherein the crop height detection device is connected to a crop height detection leveling device used for guaranteeing that the crop height detection leveling device is always in a horizontal state, and under the control of a harvester controller and a PID controller, the rotating speed of a reel, the height of the reel and the height of the header can be automatically adjusted according to the running speed of the harvester, so that the reel can vertically enter the harvester all the time and is prevented from beating wheat ears, the reel position is always located at the upper position of the gravity center after straw is cut off, and the grain loss caused by beating the wheat ears by the reel and other losses caused by disordered and crowded straw feeding are further reduced.

The invention provides a manual excrement taking device and belongs to the technical field of medical apparatuses and instruments. The problem that at present, an old person suffering from constipation is easily subjected to blood pressure rise, cerebral apoplexy and the like during defecation is solved. The manual excrement taking device comprises an excrement taking tube, wherein an excrement taking rod is arranged in the excrement taking tube, an axial liquid guide hole is formed in the excrement taking rod, a blunt excrement scraping blade is arranged at the front end of the excrement taking rod extending out of the excrement taking tube, a screw is arranged at the rear end of the excrement taking rod extending out of the excrement taking tube, a driving nut is connected onto the screw in a screwed mode and driven by an elastic clamp to move in the axial direction of the screw and further drives the excrement taking rod to perform rotary excrement scraping. The manual excrement taking device has the advantages of facilitating excrement taking performed by medical workers and usage by a patient, being capable of well treating constipation obstruction of the old, and the like.

The invention relates to the field of energy-saving buildings, in particular to an energy-saving building photovoltaic curtain wall capable of adjusting the opening degree conveniently. According to the technical scheme, the energy-saving building photovoltaic curtain wall capable of adjusting the opening degree conveniently comprises a mounting frame, a supporting rod is fixed to the mounting frame, a photovoltaic plate is hinged to the other end of the supporting rod, and a swing rod mechanism used for driving the photovoltaic plate to obliquely rotate is further mounted on the mounting frame; and the other end of the swing rod mechanism is hinged to the photovoltaic plate, a cam mechanism used for driving the swing rod mechanism to move is mounted on the mounting frame, the other end ofthe cam mechanism is connected with a chain sprocket mechanism for driving the cam mechanism to move, the other end of the chain sprocket mechanism is connected with a pedal mechanism, and the pedalmechanism is mounted on the ground. According to the energy-saving building photovoltaic curtain wall, the opening degree can be adjusted remotely through a pedal, and the problems that an existing photovoltaic curtain wall is difficult to open and close, and the opening degree cannot be adjusted at will are solved.