205results about How to "Overcome longevity" patented technology

The invention discloses high-temperature resisting methyl vinyl silicone rubber as well as a prescription and a preparation process thereof. The high-temperature resisting modified silicon rubber material which has more than 300 DEG C of application temperature and can not crack when according with requirements of 550 DEG C, 4mm distance and high-temperature radiation for more than 12 minutes is prepared by adopting the following steps of: adding cerium oxide and polymide into the prescription in which methyl vinyl silicon crude rubber is taken as a rubber raw material to improve the heat-resisting temperature, adding hydroxy silicone oil, dimethyl silicon oil and a silane coupling agent to improve the oil-resisting performance, adding precipitation method white carbon black and gas-phase method white carbon black to improve the tearing-resistance strength, adding quartz power and kieselguhr to improve the tensile strength and matching technical schemes of the preparation process. The high-temperature resisting methyl vinyl silicone rubber overcomes the problems and the defects of poor high-temperature and aging resistance performance and short service life of the common silicone rubber in the prior art, satisfies the special requirements for the heat-resisting performance, the electrical strength and the mechanical strength of automotive rubber products, and ensures that the silicone rubber products achieve the aims of improving the high-temperature resistance performance and prolonging the service life.

The invention discloses an oil return control device, an air conditioning system and an oil return control method of the air conditioning system. The oil return control device comprises an oil separation mechanism and an oil return control assembly, wherein the oil separation mechanism is arranged at an exhaust port of a lower row of exhaust cylinders in a compressor comprising two or more parallel cylinders, and is used for separating and obtaining lubricating oil from exhaust gas of the lower row of exhaust cylinders, and the oil return control assembly is arranged between the oil separationmechanism and an oil pool at the bottom of the compressor, and is used for controlling the lubricating oil to return to the oil pool according to the pressure difference between exhaust ports of thetwo or more exhaust cylinders in the compressor. According to the scheme, the defects that in the prior art, a lower cylinder is prone to wear, short in service life, low in running reliability and the like can be overcome, so that the beneficial effects that the lower cylinder is not prone to wear, long in service life and high in running reliability are achieved.

An alternating-current permanent magnet type electric power steering system based on a DSP (Digital Signal Processor) and an electric power steering method belong to the field of automobiles. The electric power steering system comprises a torque turn angle sensor, a vehicle speed sensor, a current sensor, a side acceleration sensor, a yaw acceleration sensor, a motor rotor position sensor, a signal conditioning circuit, a DSP controller, a permanent magnet synchronous motor, a motor drive circuit, a system protection circuit and a communication interface circuit. The side acceleration sensor, the yaw acceleration sensor and the torque turn angle sensor transmit the measured signals to the DSP, after being processed by the DSP through algorithms, the signals such as the electrical angle of the power-assisted motor, the three-phase current and the current vehicle speed are measured by the rotor position sensor, the vehicle speed sensor and the current sensor, and the power-assisted steering and the turn angle control are carried out according to the input signals. With the adoption of the electric power steering system and the electric power steering method, smooth switching between the power-assisted steering control and the vehicle stability is realized, the switching between the turn angle control and the torque control is achieved by a corresponding lower level motor, so that the driving stability of a vehicle and the steering comfort are guaranteed.

The invention provides a magnetic mesoporous silica gel material extracting agent used for enriching and/or separating trace organic pollutants in an environment water sample, and a preparation method thereof. A core of the extracting agent provided by the invention is a silicon gel microsphere (i.e. magnetic silicon gel microsphere) wrapped with a plurality of Fe3O4 magnetic nano particles, and a shell of the extracting agent is a mesoporous silicon gel shell layer with inner and outer surfaces modified by C18 silanization. The extracting agent integrates huge special surface area, excellent extracting capacity and ultrahigh extracting volume of a mesoporous material, magnetic separating capacity of a magnetic material, strong extracting capacity of C18 groups and special volume exclusion function of a vertical channel of the mesoporous material. In addition, the extracting agent provided by the invention has the advantages of high extracting efficiency, low preparation cost and simple preparation method, and is very suitable for preprocessing samples of the trace organic pollutants in a bulk-mass water sample.

The invention relates to a method for oxidation desulfurization of fuel oil. According to the method, (1) peroxide or a mixture of peroxide and oxygen (air) and (2) a heterogeneous catalyst which has catalytic action and contains Pd, Pt, Ru, Au and Ag are involved, and under the effect of the catalyst, the peroxide is decomposed to generate high-oxidbillity free radicals to be used for oxidized removal of sulphur-containing substances in the fuel oil. The molar mass of the catalyst on a metal basis is 1/5000-1/2 that of sulfide, and the molar mass of an oxidizing agent is 1/2-100/1 that of the sulfide. Compared with a conventional method, the method has the advantages of being high in desulfurization efficiency, moderate in reaction condition and simple in process and having easiness in separation.

The invention provides a superhydrophobic coating prepared from particles with ultrahigh roughness. The superhydrophobic coating is prepared from the following components: particles with protrusions or holes and unsmooth structures, protective particles, a bonding agent and an assistant, wherein the volume ratio of the particles with the protrusions or the holes and the unsmooth structures to the protective particles to the bonding agent is (0.1-7):(1-7):(1-10). A lotus effect technical theory is applied to obtain a super-hydrophobic, underwater superhydrophobic oil or super-amphiphobic surface coating, further the performance of the coating is improved, and the defects of the conventional superhydrophobic coating that the structure is easy to damage, the service life is short and the like are overcome. The prepared coating has super hydrophobic properties (super-hydrophobic, underwater superhydrophobic oil or super-amphiphobic properties), self-cleanness and excellent wear resistance; substrate materials suitable for the coating are glass, plastic, rubber, textiles, paper, metal, cement, ceramic materials or the materials covering other coatings.

The new type nodal real-time gas densitymonitoring method and sensor has one near infrared DFB semiconductor laser and operates on the characteristic absorption of methane in the near infrared spectrum region. One monomode fiber power coupler is used in separating the laser beam into several beams led through fibers to fiber gas absorption cells in mine, and the laser beams through the absorbed gas are then led through fiber to the input optical switch. The selected signal through the calibrating cell is projected to the laser detector. By means of wavelength modulating technology and second harmonic detecting technology, the present invention realizes gas density measurement in high sensitivity, high resolution, no gas interference and fast response. Background light strength signal fitting method is adopted to eliminate the influence of light strength fluctuation on the measurement.

The invention relates to a preparation method of a TiBw/Ti-6Al-4V composite bar adopting a quasi-continuous reticular structure and solves problems that existing Ti-6Al-4V composites are harsh in technological condition, high in equipment requirement, low in production efficiency, difficult to produce on a large scale and the like. The method comprises steps as follows: low-energy ball milling and mixing are performed on spherical Ti-6Al-4V powder and TiB2 powder firstly; then TiB2/Ti-6Al-4V mixed powder is placed in a metal sheath for cold press molding, and vacuum degassing and sheath sealing welding are performed to obtain an extrusion billet; finally, short-time pre-sintering is performed on the obtained extrusion billet, and hot extrusion deformation is performed on the pre-sintered extrusion billet to obtain a required material. The method can be applied to preparation of a TiBw/Ti-6Al-4V composite adopting the quasi-continuous reticular structure.

The invention discloses a novel polyether-ether-ketone (peek) bar which is designed for solving the problems of slow crystallization speed caused by too large viscosity during processing and being too difficult to be processed caused by good metal cohesiveness after the forming by processing existing in a present PEEK bar. The invention comprises the following components according to weight proportion: 55.5 parts to 100 parts of peek resin, 2 parts to 4 parts of lubricant, 0.05 part to 0.5 part of nucleating agent and 0.05 part to 43 parts of filler. The invention also discloses the preparation method and use of the bar and has the advantages of fast molding, good processing performance and wide use.

The invention is concerned with a kind of process equipment for produce production, especially a kind of wire feeding welding machine with fuse for fusible core. The worktable fixed on the frame has turning plate frame with at least four tasks and the task has movable clamp extended among the radial direction, and at the corresponding position to each task, there are tube push framework, wire feeding welding upper cap framework, welding down cap framework, location framework and stuff-accepting framework on the surface of worktable. Except the stuff-accepting framework, each of the aforesaid framework drives by each cam and drive pole under the worktable. The tube push framework connects with tube feeding equipment, and the wire feeding welding upper cap framework connects with upper cap feeding equipment, the welding down cap framework connects with down cap feeding equipment. The worktable and / or turning plate has equipment that keeps clamp moving. The drive axis drives by motor, the feeding equipment, heating equipment and motor of the tube, upper cap and down cap monitors by power control equipment.

The invention discloses a miniaturized LED integrated array device and a preparation method thereof, and relates to the technical field of luminescence display. With the device and method, the problem of limited use due to bending incapability of a conventional planar LED micro-display device can be solved. The working process of the miniaturized LED integrated array device is as follows: current is injected from an upper electrode and flows out of a lower electrode, so that an electric field is formed in the device, and positive and negative carriers emit light at a luminescent layer in a composite manner; a part of the light is oriented upwards, passes through an euphotic layer and comes out of a micro-lens; and a part of the light is oriented downwards, reaches a reflection layer, is reflected by the reflection layer, passes through the luminescent layer and the euphotic layer, and then comes out of the micro-lens. The luminescent device is based on the luminescence principle of composite luminescence of the carriers in a p-n structure and has the non-linear characteristics of the current and voltage of a diode so that the luminescent brightness also has the non-linear characteristics according to the size of the injected current. The brightness of pixel elements is controlled through a circuit so that luminescence display is realized.

The invention relates to a steel cable comprehensive maintenance, cleaning and maintaining system of a winch for a boat. A guide wheel support frame is coaxially and fixedly arranged on a deck in front of the winch, a guide wheel is arranged on the guide wheel support frame, a steel cable is wound on a groove wheel arranged in the winch, a cleaner is coaxially sheathed on the steel cable arranged between the guide wheel and the winch, an oil coater is coaxially sheathed on the steel cable arranged between the cleaner and the winch, the cleaner is respectively communicated with a compressed air pipe of an air compressor and a pressure fresh water pipe of a pressure boosting water pump, and the oil coater is communicated with a pressure oil pipe of a small-size grease pump. The system has the advantages that the cleaner and the oil coater are sequentially arranged on the steel cable in front of the winch, the cleaner comprises the steps of pressure fresh water cleaning and compressed air blow-drying, and the goal of steel cable cleaning is reached; and pressure lubricating grease is uniformly smeared on the oil coater through the cleaned steel cable, moisture in the steel cable is squeezed out through the pressure lubricating grease, the fresh lubricating grease is fully filled inside the steel cable, the corrosion of the steel cable is effectively lightened, and the service life of the steel cable is prolonged.

The invention discloses a vehicle detection method. A detection area is set on a field image to be detected, the field to be detected is subjected to video monitoring, and the detection for vehicles is completed by utilizing line bumping records of the vehicles passing the detection area. The vehicle detection method adopts the virtual detection area set in the field image to be detected to replace an entity detection sensor adopted by the prior detection means so as to overcome the inherent defects of poor reliability, short service life, high maintenance difficulty, large destructiveness on surrounding environment and the like of the prior detection means, has the obvious advantages of quick and precise detection, small computation, good real-time, high measuring accuracy and the like, and can be applied to various urban road conditions.

A composite suspension device for torsion bar coil springs comprises two symmetrical suspension devices with double wishbones, wherein each suspension device comprises a suspension support (5), a telescopic shock absorber (4), an upper suspension lever (3) and a lower suspension lever (3), a main flexible element employs a coil spring (1) and a supplementary element uses a torsion bar spring (9). The invention can be used for rear axles of off-road vehicles. The suspension system realizes large travel, heavy load and variable rigidity characteristic, simultaneously reduces processing difficulty of coil springs, decreases shear stress which each elastic element receives in operational process, thereby prolonging the service life of coil springs, increasing reliability of the suspension system and the entire car and decreasing processing and manufacturing costs of the suspension system.

The invention relates to a general partition wall vibrating process and device for recovering volatile organic matters. The process comprises the following steps of: (1) adsorbing; (2) desorbing; and (3) cooling, condensing and recovering. An adsorption-desorption device comprises a tank body or a tower body, and is characterized in that: an external wall heat exchanger is arranged on the adsorption-desorption device; an internal partition wall heat exchanger is arranged inside the adsorption-desorption device; and the bottom of the tank body or the tower body is provided with a vibrator by connecting. The invention has the advantages that: (1) the adsorption and desorption processes are efficiently and safely finished; (2) the defects of difficulty in separating during recovery of VOCs (Volatile Organic Compounds) with TSA (Temperature Swing Adsorption), shorter service life and lower efficiency of an adsorption agent, and the like are overcome, the recovered VOCs have high purities, and the consumption of a cooling agent is lowered; and (3) the process and the device are suitable for recovering organic matters of low, middle and high boiling points, and particularly, the problem of difficulty in recovering a solvent of a high boiling point is solved.

The invention discloses a reflective optical fiber sensor device, which comprises a light source, an optical detector and a sensor probe, wherein the sensor probe is used for receiving and processing the incident light emitted by the light source and sending the obtained reflected light to the optical detector. The reflective optical fiber sensor device can overcome the defects that the sensor in the prior art has large volume, cannot be used in an environment with electromagnetic interference and has short service life and poor corrosion resistance, and has the advantages of small volume, wide application range, long service life and good corrosion resistance.

The invention provides a mine dust concentration measuring device which comprises a sensitive element, a control circuit module and an upper computer. The sensitive element comprises inductive type metal electrodes, the control circuit module comprises a measuring circuit, a signal conditioning circuit, an A/D switching circuit and a microprocessor, the sensitive element generates micro electric charge signals on the metal electrodes, the micro electric charge signals are processed through the measuring circuit, the signal conditioning circuit, the A/D switching circuit and the microprocessor in real time and then are transmitted to the upper computer, and the upper computer carries out information preprocessing and feature extraction, sets up a soft measurement model, and then outputs dust concentration measuring signals. The invention further provides a dust concentration measuring method. The mine dust concentration measuring device and the measuring method thereof have the advantages that the defects that measuring errors are large, influences of humidity are obvious, the service life is short and maintenance is inconvenient in an existing mine dust concentration measuring method are overcome effectively, accurate measurement data for coal mine improvement are provided, the borehole operation environment is improved, and the physical health of workers and the safety production of coal mines are protected.

The present invention discloses a method for monitoring and protecting lithium precipitation of a lithium ion battery. The method comprises the steps of: in a charging process of a lithium ion battery, monitoring the potential change of a negative electrode of the lithium ion battery relative to a reference electrode online; when the potential of the negative electrode is reduced to a lithium precipitation warning value relative to the potential of the reference electrode, stopping charge or changing a charge policy to achieve monitoring and protection of the lithium precipitation of the lithium ion battery. According to the scheme, the defects are overcome that the maintenance is difficult, the service life is short and the safety is poor, and the method for monitoring and protecting lithium precipitation of the lithium ion battery is small in maintenance difficulty, long in service life and good in safety.

The invention relates to a plane two-degree-of-freedom seven-rod closed chain type reach stacker for containers. The plane two-degree-of-freedom seven-rod closed chain type reach stacker for the containers comprises a suspension arm and a suspension lifting and telescoping mechanism, wherein the suspension arm comprises a rotating arm and a telescopic arm; the rotating arm is hinged to the rear part of a frame; the telescopic arm is mounted on the rotating arm through a sliding pair; a clamping device is arranged at the front end of the suspension arm; the suspension arm lifting and telescoping mechanism comprises five-rod linkage mechanisms which are symmetrically arranged on the two sides of the suspension arm; each five-rod linkage mechanism comprises a front rocker, a front connecting rod, a rear connecting rod and a rear rocker; the front rockers and the rear rockers are hinged to the front part and the middle part of the frame respectively; the hinged points between the front connecting rods and the rear connecting rods are arranged on the telescopic arm. Ascending, telescoping and descending of the crane are realized under the drive of the five-rod linkage mechanisms. The plane two-degree-of-freedom seven-rod closed chain type reach stacker for the containers has the advantages of small movement inertia, flexible track output, high precision, high rigidity, excellent dynamic performance, high reliability and the like.

The invention discloses a manufacturing method of a stator structure of a submersible motor, wherein the stator structure comprises a stator case, an iron core, a stator winding and a winding lead wire; the upper end and the lower end of the stator case are respectively welded with an upper flange end ring and a lower flange end ring in a sealing way and also fixed with a stainless steel shielding sleeve and a lead wire sealing device that is used for sealing and wrapping the edge of the winding lead wire; insulating fluid sealant is filled in the clearances among the stator case, the stainless steel shielding sleeve, the upper flange end ring, the lower flange end ring, the iron core and the stator winding. The method for manufacturing the stator structure of the submersible motor includes the following sequential steps of manufacturing the stator case and the stainless steel shielding sleeve by rolling according to the argon arc welding means; manufacturing the stator winding and the iron core; lathing the upper flange end ring, the lower flange end ring and a small V-shaped convex ring; assembling, sealed-welding and reshaping; preparing the insulating fluid sealant; filling the insulating fluid sealant; and sealing. The stator structure has the benefits of complete sealing of the stator winding of the motor, high watertight and insulating performances, simple structure and safe and reliable operation.

The invention discloses a three-rod double-slide large-angle inclined jacking core-pulling ejector pin device, which comprises an inclined slide seat (1), an inclined slide foot (2), an inclined ejector pin (3), a parallel guide rod (4), an auxiliary slide block (5) and an auxiliary guide rod (6). According to the three-rod double-slide large-angle inclined jacking core-pulling ejector pin device, the auxiliary slide block is arranged between the inclined slide seat and the inclined slide foot and slides in a sliding chute A of the inclined slide seat, the inclined slide foot slides in a sliding chute B of the auxiliary slide block; the inclined ejector pin is orthogonally and fixedly connected with the inclined slide foot, the parallel guide rod and the inclined ejector pin are parallel and orthogonally slide through the inclined slide foot, and the auxiliary guide rod orthogonally slides through the auxiliary slide block; and when the three-rod double-slide large-angle inclined jacking core-pulling ejector pin device works, the auxiliary slide block is driven to obliquely slide along the sliding chute A of the inclined slide seat by the auxiliary guide rod, the inclined slide foot slides in the sliding chute B of the auxiliary slide block, then, the inclined ejector pin and an inclined core-pulling block are driven to be jacked out and reset. According to the technical scheme, through the driving function of the auxiliary slide block and the auxiliary guide rod, the inclined jacking core-pulling ejector pin device can reach the aims of wear reduction, life prolongation, easiness in resetting, and enlargement in inclined jacking applied angle.

The invention relates to a plane two-degree-of-freedom seven-rod servo drive reach stacker for containers. The plane two-degree-of-freedom seven-rod servo drive reach stacker for the containers comprises a suspension arm, a suspension arm lifting mechanism and a suspension arm telescoping mechanism, wherein the lower end of a rotating arm of the suspension arm is hinged to the middle of a frame; a telescopic arm of the suspension arm is mounted on the rotating arm in a sliding manner; the suspension arm lifting mechanism comprises a lifting rocker and a lifting connecting rod; the lower end of the lifting rocker is hinged to the front part of the frame; the upper end of the lifting connecting rod is hinged to the rotating arm; the lifting rocker is hinged to the other two ends of the lifting connecting rod; the suspension arm telescoping mechanism comprises a telescopic rocker and a telescopic connecting rod; the lower end of the telescopic rocker is hinged to the rear part of the frame; the front end of the telescopic connecting rod is hinged to the telescopic arm; the telescopic rocker is hinged to the other two ends of the telescopic connecting rod. The plane two-degree-of-freedom seven-rod servo drive reach stacker for the containers realizes clamping, lifting and carrying operation of the containers under the combined drive of the suspension arm lifting mechanism and the suspension arm telescopic mechanism, and has the advantages of small movement inertia, flexible track output, high precision and the like.

The invention relates to a drill stem thickening process and a thickening module. The thickening module comprises a thickening module 1 and a punching module 2. a third time thickening module is a final forming module, namely an inner thickening copying module, which comprises a clamping area 11, a transition belt 12, a thickening area 13, a transformation transition belt 14 and a starting area 15 which are orderly connected with the thickening area 13. The length of the transition belt of the thickening module is prolonged and the transition is performed in the manner of S-shaped smooth transition. The invention overcomes the shortcomings of the prior art that the shape of the transition belt in the drill stem is uneven, lathe work is required, the stress concentration is easily occurred, the service life of the drill stem is short, and the like. Compared with the prior art, the thickening transition belt in the drill stem can naturally smooth transit so the stress concentration in the deformation area and the probability of generating vortex caused by size change during usage are greatly decreased, the stress at the thickened tube joint part is reduced, the inner transition belt of the final products is unnecessary to form, the use life of the drill stem is prolonged and the drill stem quality is ensured.

The invention discloses a non-pre-buried type abnormal-shaped bent water channel hot-work die and a manufacturing method of the non-pre-buried type abnormal-shaped bent water channel hot-work die. The manufacturing method is characterized in that casting-state die workblank manufacturing is achieved by combining a ceramic core or a 3D printing core with a traditional sand casting method, and includes the steps of die workblank manufacturing, casting-state die workblank coarse machining and casting-state die workblank finish machining. The die workblank manufacturing includes the steps of manufacturing a cavity, an abnormal-shaped bent water channel core and a casting system, assembling the die, smelting steel, carrying out rapid casting, and carrying out cleaning, shot blasting, annealing, post-processing and flaw detection on the abnormal-shaped bent water channel core and a water collecting groove inlet-and-outlet core. The casting-state die workblank coarse machining includes the steps of casting-state die workblank profile coarse machining, quenching and tempering. The casting-state die workblank finish machining includes the steps of casting-state die workblank profile finish machining, casting-state die workblank matching face finish machining and profile PVD plating. The non-pre-buried type abnormal-shaped bent water channel hot-work die and the manufacturing method of the non-pre-buried type abnormal-shaped bent water channel hot-work die solve the problems that an abnormal-shaped bent water channel with optimized values cannot be achieved through a traditional mechanical drilling manner and the cooling rate of the traditional mechanical drilling manner is uneven, and have the advantages that the profile temperature is even, and the die machining cost is reduced.

Provided is a chloride-free extreme pressure microemulsion cutting fluid. The cutting fluid is prepared from the following raw materials, by weight, 4-5 parts of boric acid, 1-2 benzotriazole, 1-2 parts of octyl decanoic acid, 1-2 parts of lauryl sodium sulfate, 3-4 parts of polyacrylamide, 2-3 parts of urea, 0.8-1.2 parts of span 40, 0.5-1 part of lanthanum nitrate, 12-15 parts of kerosene, 6-8 parts of auxiliary agents and 200 parts of water. The cutting fluid contains no harmful substances of sodium nitrite, phenol, chlorine, mercury and the like, and is safe and environmentally friendly. Through application of boric acid and lanthanum nitrate, the cutting fluid has excellent extreme pressure performances, and workpieces are not easy to damage. The cutting fluid is advantaged by stable emulsification, no delamination, no coacervation, long service time and low cost. The cutting fluid is suitable for processing of a plurality of materials such as cast iron, steel, aluminum, copper, magnesium alloy and the like, and can meet a plurality of processing technology requirements of turning, drilling, grinding, center processing and the like.

The invention discloses a mechanical backup device for a petroleum logging tool, which comprises a cylindrical housing; a plurality of backup parts capable of being accommodated in the housing are uniformly arranged on the outer side of the housing in the circumferential direction; the backup parts improve the success rate of pricking probes into a sleeve wall effectively through adopting a mechanical backup way; the force of pricking the probe in a sleeve is large, and the action consistency is high; the three probes uniformly distributed on the circumference can be firmly pricked on the sleeve wall to form a stable measuring environment, the working efficiency is high, the reliability is strong, and the operation is simple; a driving force for driving the backup parts is provided, without adopting hydraulic expansion and contraction of a rubber part, so that the defects that the rubber is easy to age and the service life is short are overcame, so that the mechanical backup device can be repeatedly used; and the selectivity of the driving force is wide, and power can be provided for the mechanical backup device through hydraulic driving or motor driving.

The silane crosslinked polyethylene pipe union includes a silane crosslinked polyethylene pipe body produced by using the material comprising at least organosilicon monomer as grafting initiator, hydrolytic polycondensation catalyst and polyethylene as well as through extrusion or injection and reaction of crosslinking polycondensation and with spigots added. It is used to consitute permanent connection with silane crosslinked polyethylene pipe.

The invention discloses a preparation method of a C10<+> heavyweight aromatic hydrocarbon transalkylation catalyst. The preparation method is characterized in that firstly, the catalyst is prepared from a main active component named a HY molecular sieve with the mass percentage of 50-80% and the grain size of 30-100 nanometers, an adhesion agent named aluminum oxide of 15-40% and a modifying agent component named metal or a metallic oxide of 1-8%; secondly, the catalyst is prepared by the following steps: 1) mixing the nano HY molecular sieve with aluminum oxide, adding a squeeze aid, a pore-enlarging agent or an intensity additive with the mass percentage of no more than 5%, carrying out extrusion molding with a dilute nitric acid solution with mass percentage concentration of 4%, airing naturally, drying at 100-120 DEG C for 10-15 hours, then carrying out temperature programming to 550 DEG C, and roasting for 4-6 hours, thereby preparing a semi-finished catalyst; and 2) adding the product in the step 1) into a metal salt solution of the modifying agent component, dipping at room temperature with the equal volume for 6-30 hours, drying at 100-120 DEG C for 10-15 hours, then carrying out temperature programming to 550 DEG C, and roasting for 4-6 hours, thereby obtaining the finished product of the catalyst.

The invention provides antibacterial paint, anticorrosive paint, an antibacterial and anticorrosive coating and an oil transportation pipeline. The antibacterial and anticorrosive coating comprises a slow-release antibacterial layer and a heavy anticorrosive layer, wherein the thickness of the heavy anticorrosive layer is 50-200 micrometers, and the thickness of the slow-release antibacterial layer is 20-80 micrometers. The inner wall of the oil transportation pipeline is coated with the heavy anticorrosive layer, and the surface of the heavy anticorrosive layer is coated with the slow-release antibacterial layer. Compared with the prior art, the slow-release antibacterial and anticorrosive oil transportation pipeline has the advantages that the defects that an oil transportation pipeline on the market is poor in antibacterial effect and high in cost, and an existing oil transportation pipeline with the antibacterial effect is short in antibacterial life and poor in anticorrosive property are overcome.

The invention belongs to the technical field of steel refining, and particularly relates to a device and a method for single snorkel vacuum degassing refining of molten steel by employing bottom injection. The device disclosed by the invention comprise an air supply system, a powder spray system, a single snorkel vacuum degassing refining furnace, wherein an airflow distributor on the air supply system is branched into three gas circuits which are connected with the powder spray system; a powder airflow delivery pipe in the powder spray system is connected with a bottom powder injection element; the bottom powder injection element is built at the bottom of a ladle furnace of the single snorkel vacuum degassing refining furnace; and an opening is formed in the lower end of a vacuum chamber of the single snorkel refining furnace and is inserted into a steel ladle molten pool. The method for single snorkel vacuum degassing refining of molten steel by employing bottom injection comprises the following steps: firstly, blowing a gas and stirring molten steel; blowing powder into the steel ladle through the bottom powder injection element under the transportation of a carrier gas flow; and after the blowing time is ended, entering the next work circle. The device and the method are easy to achieve, short in production cycle, and high in production capacity; equipment investment and operation costs on an overhead bunker and a wire feeding mechanism are reduced; the technological operation is simple; and energy conservation and emission reduction are facilitated.