1692results about How to "Guaranteed compactness" patented technology

The invention discloses a method for preparing a high-strength polyacrylonitrile-based carbon fiber precursor. The method comprises the steps of: using azodiisobutyronitrile to trigger acrylonitrile and a comonomer to perform homogeneous solution polymerization in dimethyl sulfoxide to obtain spinning solution, and controlling the temperature of the spinning solution to be between 40 and 70 DEG C and the solid content to be between 18 and 24 percent; performing monomer removal on the spinning solution under the pressure of between -60 and -78kPa, and performing deaeration treatment under the pressure of between -78 and -97kPa; then extruding the spinning solution into a spin duct in a coagulation bath with a temperature of between 35 and 65 DEG C and a dimethyl sulfoxide concentration of between 50 and 70 percent for molding through a spinneret, and obtaining PAN-based as-spun fiber through 45 to 75 percent of minus stretch in the coagulation bath; then molding and stretching through a secondary coagulation bath, a third coagulation bath, a fourth coagulation bath and a fifth coagulation bath; and obtaining the high-strength polyacrylonitrile-based carbon fiber precursor through solvent removal by water scrubbing, hot water stretch, oiling, drying and densification, steam stretch, and hot air setting. The tensile strength of the high-strength polyacrylonitrile-based carbon fiber precursor reaches 10.2cN / dtex.

The invention discloses a steering gear of an unmanned vehicle and a control method thereof, wherein the steering gear is characterized by comprising a motor, a worm gear and a worm, an electromagnetic clutch and an encoder, wherein the motor is a steering drive mechanism; the worm gear and the worm are meshed with each other, and the worm is directly coupled with the output shaft of the motor; the electromagnetic clutch is fixedly coupled with the drive end of the electromagnetic clutch; and the encoder is fixedly coupled with a steering column of a steering wheel by the driven end of the electromagnetic clutch and is connected onto the output shaft of the rear end of the motor. The invention can realize the automatic steering control of the unmanned vehicle, can be freely switched between two modes of unmanned driving and manual driving the switching of which are not interfered with each other, and has compact structure, low cost, higher transmission efficiency, higher intelligent degree of vehicle automatic steering; and both the structure and the appearance of the original vehicle are not damaged, and the steering gear is easy to be assembled and dismantled and is applicable to other occasions with high automatic rotation requirements.

The invention aims to provide a synchronous phase-shifting Fizeau interference device capable of performing real-time high-accuracy measurement on the surface appearance of an object. A synchronous phase-shifting technology is combined with a Fizeau interference method, and the technical problems that the traditional interferometer has low stability and low measurement accuracy and cannot measure objects in real time and the like are solved. The synchronous phase-shifting Fizeau interference device capable of measuring in real time comprises an illumination unit, an interference unit and a synchronous phase-shifting unit. Due to the adoption of a coaxial interference light path, a space-bandwidth product of a charge coupled device (CCD) is fully utilized; and compared with an off-axis light path, the coaxial interference light path has a higher spatial resolution; a flat glass plate in the traditional Fizeau interferometer is replaced by a 1 / 4 wave plate, so that object light and reference light have orthogonal polarization directions, and the compactness of the structure of the device is kept under the synchronous phase-shifting; and moreover, four phase-shifting interference patterns can be obtained through single exposure, and the real-time property of measurement is realized on the premise of guaranteeing a high spatial resolution.

A storage mamagement method of embedded database,includes that: (1) the storage strategy of data in the memory is that: if logic structure accords with physical structure, the structure is into a divided system area, a main storage database area, a user working area, a log area and a preformed area; the storage strategy of data in the external memory is that: logic structure is divided into a database table, a segment and a database block; physical structure includes a physical file and a physical block; (2) the physical file organization of database is that: a data dictionary is placed at the heading, a user table since then; (3) the memory management of data dictionaryin the external memory is that: the described information of physical file is stored in the file header, denotative definition kind and attribute definition kind adopt a three section type storage form; data dictionary adopt a page type memory management method in the memory; (4) a permanent memory data is stored using T tree and a a permanent external memory data is stored using B+ tree; data and its index are managed using a extended segment memory management method. The invention improves the utilization rate of memory space, and accelerate the speed of data to access.

A vehicle comprises a transaxle, a battery and a load carrying bed. The transaxle includes a casing incorporating a drive train and supporting an axle and includes an electric motor mounted on the casing to drive the axle via the drive train. The battery is provided for supplying electric power to the electric motor. The transaxle and the battery are disposed below the load carrying bed so as to overlap the load carrying bed when viewed in plan.

A process for preparing zirconium oxide nano-particles used for coated thermal barrier layer includes such steps as preparing the mixed solution of zirconium oxychloride and yttrium oxide (or chloride), adding ammonia water, washing for dispersing, hydrothermal reaction to generate Y-stabilized ZrO2 nano-particles, separating, coating by aluminium oxide, drying, granulating and heat treating.

The invention discloses a halogen-free cleaning-free rosin flux, and preparation and application thereof, and particularly relates to a flux suitable for surface mount lead-free welding paste, preparation of the flux and application of the flux. The flux comprises 20-50% (mass fraction, the same below) of rosin, 5-25% of film-forming agent, 30-50% of high boiling solvent, 3-8% of activator and 2-5% of thixotropic agent, and the flux does not contain any halogen. In order to control growth of interface IMC (intermediate compound) during welding, 0.3-1% of combined inhibitor is added. The welding paste prepared with the flux and lead-free tin-silver-copper powder has the advantages of excellent printing performance, fine weldability, less post-weld residue, thin and even welding spot interface IMC and excellent mechanical property, and is capable of meeting the requirement of high-end electronic products on packaging.

The invention discloses a laser scanning method for laser melting in a selected area. The laser scanning method comprises the following steps: dividing a workpiece area into a plurality of latticed regular triangles with side length being 1mm-10mm and a plurality of irregular figures at borders according to the cross section information of a workpiece, taking a gap G between the adjacent figures from -1mm to 1mm; scanning the irregular figures at the borders as the zoning regular triangles and adopting an equidistant scanning line for successively finishing the zoning figure scanning; according to the zoning direction, adopting the equidistant scanning line for successively finishing the gap scanning; scanning along a practical outline of the workpiece or the outline deviating within 1mm inward or outward to the practical outline of the workpiece according to the requirement, or repeatedly scanning along a plurality of outlines deviating from the practical outline of the workpiece within 1mm, thereby finishing the cross section canning for the workpiece. According to the scanning method provided by the invention, the scattering effect of residual stress in the workpiece during a laser scanning process is improved, the laser scanning direction during the scanning process does not need to be repeatedly changed, the scanning efficiency is high, the technique control is simple, and the compactness and the precision of the workpiece are ensured.

The invention belongs to the technical field of nano-materials and chemical power sources and particularly provides a nano-Si or nano-Sn containing composite cathode material for a lithium ion battery and a preparation method thereof. The composite cathode material of the invention comprises the following components: cathode active substances, nano-Si or nano-Sn, and macromolecule polymers. The method taking the above components as raw materials comprises the following steps: firstly, preparing mixed solution; then, removing organic solvent; further coating the mixed solution with the macromolecule polymers; then, removing organic solvent; and finally, carrying out carbonization treatment to obtain the finished product. The invention has the advantages of fewer components, low cost, simple process and low energy consumption; and the composite cathode material prepared by the method of the invention has a core-shell structure and has the characteristics of high capacity, high stability and high capability of rapidly charging and discharging. Therefore, the composite cathode material of the invention is widely applicable to lithium ion batteries, super-capacitors and other components based on new energy resources and particularly applicable to lithium ion batteries for electric vehicles.

The invention discloses a dispersive modulation-based non-mirror image optimal frequency domain imaging system and a dispersive modulation-based non-mirror image optimal frequency domain imaging method. In the system, a transmission-type optimal scanning delay line is arranged in a reference arm for modulating dispersion so as to ensure the identity of the axial positions of a sample under different dispersion states; by changing a rotation angle of an oscillating mirror in the transmission optimal scanning delay line, the rapid modulation of dispersion is realized, and two group of interference spectrum signals of the same sample are acquired under two different dispersion states; the two group of acquired interference spectrum signals are respectively multiplied by corresponding dispersion compensation factors so as to accurately compensate the dispersion of imaginary part subjected to corresponding Fourier transform; subtraction operation is performed on the two group of interference spectrum signals subjected to dispersion compensation, then, the imaginary part of the corresponding repeated reflection signal disappears, and the real part still contains the dispersion factor; and finally, the interference spectrum signals subjected to subtraction are subjected to dispersive compensation again and then subjected to Fourier inverse transformation so as to obtain the actual reflection signal of the sample for non-mirror image reconstruction of the sample image.

Each power source switching unit (8) of a electric power system (1) constituted of a power operating system having a power generator (3) driven by an external power source (40) and an engine (4) is constituted of a means for sensing information on a selected power source and supply power in time series, calculating a supply power quantity every power source on the basis of sense data, and storing these sensing and calculated data. This power source switching unit (8), disposed every power load group, comprises a means for communication with another power source switching unit (8). A power source management system, constituted of the power source switching unit (8), comprises a means for transmitting the sensed data or calculated data of each power source switching unit (8) to the control system of the power generating system, a means for receiving data transmitted from the power source management system, and an image display means for displaying the received data by graphing.

A transaxle is adaptable to a vehicle equipped with a longitudinal engine including an engine output shaft to be oriented in a longitudinal direction of a vehicle. The transaxle comprises a transmission output shaft to be oriented in a lateral direction of the vehicle so as to be drivingly connected to a drive wheel of the vehicle, a hydrostatic transmission and a mechanical transmission for transmitting power from the engine output shaft to the transmission output shaft, and first and second power take-off shafts for taking off power from the mechanical transmission. The engine is joined to the transaxle so that the engine, the hydrostatic transmission and the mechanical transmission are assembled together. The first and second power take-off shafts are distributed rightward and leftward from the engine.

The invention relates to a lithium ion battery diaphragm. The lithium ion battery diaphragm comprises a polyolefin substrate and a composite coating, wherein the coating is connected with the polyolefin substrate through a binder, the coating is formed by stacking a plurality of inorganic particle layers, and each two adjacent inorganic particle layers of the coating are connected with each other through a binder; each inorganic particle layer consists of flaky inorganic particles, and the flaky inorganic particles are distributed in parallel or at a small angle in the coating. The invention also relates to a preparation method of the lithium ion battery diaphragm. The preparation method comprises the following steps: preparing flaky inorganic particles; screening first inorganic particles and second inorganic particles; preparing coating slurry; coating the polyolefin substrate with the coating slurry, and drying the polyolefin substrate with the coating to obtain a product. The lithium ion battery diaphragm is high in flatness, low in coarseness, low in water absorption rate, low inn coating expansion degree, capable of effectively reducing the natural crimpness of single-side coated diaphragm and capable of improving the assembling efficiency and rate of finished products of a laminated battery.

The invention relates to a bridge deck structure of a steel bridge, in particular to a steel and ultra-high performance concrete combined bridge deck structure, comprising a steel bridge deck, an ultra-high performance concrete layer is coated above the steel bridge deck, a bridge deck pavement layer is coated above the ultra-high performance concrete layer, and the ultra-high performance concrete layer is internally provided with reinforced bars. The steel and ultra-high performance concrete combined bridge deck structure has the advantages of small construction height, large stiffness, good binding performance between combined layers, good durability, good fatigue resistance, little vehicle impact and the like.

The invention provides a spinning process of covering yarn with high hollowness degree, a prepared covering yarn and a process for weaving towel by utilizing the covering yarn. The spinning process comprises the following steps of: compositing and twisting two crude cotton yarns and water-soluble vinylon filament with number of 4.1-7.3 tex to prepare a spun yarn with cotton fiber covering the water-soluble vinylon filament; and hydrolyzing the water-soluble vinylon filament to obtain the covering yarn with the high hollowness degree. The strength and the hollowness degree of the covering yarn with the high hollowness degree, prepared by the spinning process disclosed by the invention, are higher than the strength and the hollowness degree of a common hollow covering yarn with the same yarn count, the overing yarn with the high hollowness degree is soft and fluffy and has strong water absorbability and improved heat insulation performance; and the woven towel prepared by the process of the invention is light and fluffy, and has good heat insulation performance and resilience, high water absorption speed, large unit-area water absorption amount and high drying speed.

The invention discloses an automatic coiling and uncoiling device for a distribution circuit power cable. The automatic coiling and uncoiling device comprises a base, wherein a chamber I is arranged at the bottom of the base; a sliding plate is arranged in the chamber I; universal idler wheels are arranged at four corners at the lower end of the sliding plate; an extension spring is arranged between the sliding plate and the top wall of the chamber I; a jacking device is arranged on the base; a coiling device, a tensioning device and a cable uncoiling device are arranged on the base in turn; the coiling device comprises an outer support ring and an inner support ring; a rolling structure is arranged between the outer support ring and the inner support ring; a rotating ring is fixedly connected with the middle part of the inner support ring; coiling plates are respectively arranged at the two ends of the rotating ring; the tensioning device comprises a tensioning bracket and a tensioning roller; the two ends of the tensioning roller are arranged on the tensioning bracket; and the cable uncoiling device comprises an uncoiling mechanism capable of reciprocating and an uncoiling driving motor connected with the uncoiling mechanism. According to the invention, the coiling device, the tensioning device and the cable uncoiling device are successively arranged, so that the automatic coiling and uncoiling of the cable can be realized and the winding intensity, tightness and uniformity of the cable can be guaranteed.

A seal structure of an electric kettle comprises a body with a handle and a bottom cover of the body. A heating element is disposed in the body. The body is provided with a body opening corresponding to the heating element. A seal part is disposed at the connection of the body opening with the heating element. The seal part or the body is provided with a snap ring outside. The snap ring for fixing the heating element is hermetically connected with the body, or the seal part or the body is provided with a retractable strip, or a metal tying wire for fixing the heating element is hermetically connected with the body. The seal part is provided with a groove part with an upward opening, or the inner wall of a silicone seal ring and the outer wall of the heating element form a groove part with an upward opening, or a contact face of the seal part is in extrusion-deforming fit with the cross section of the body opening. The seal part is added to the heating element and provided with the snap ring, the retractable strip or the metal tying wire outside, and accordingly the heating element is hermetically connected with the body, poor tightness, seepage and the like are effectively prevented, and product quality is improved.

A power transmission apparatus for a working vehicle according to the present invention comprises: substantially symmetrically disposed first and second transaxles each of which includes an input shaft and a housing supporting a single axle; and a working apparatus driving power take-off device including an input member. A gear casing is spanned between the housings of the respective transaxles. A primary drive shaft is disposed in the gear casing so as to be drivingly connected to a prime mover. A traveling drive train is disposed in the gear casing so as to drivingly connect the primary drive shaft to the input shafts of the respective transaxles. A working apparatus drive train is disposed in the gear casing so as to drivingly connect the primary drive shaft to the input member of the working apparatus driving power take-off device.

The invention relates to an aqueous two-component polyurethane topcoat coating, which consists of a component A and a component B. The component A comprises the following raw materials in weight part: 15-32 parts of aqueous hydroxyl polyacrylate dispersoids, 12-30 parts of aqueous anionic polyacrylate dispersoids, 0.02-2 parts of antifoaming agent, 0.5-3 parts of leveling agent, 1-5 parts of wetting and dispersing agent, 0.2-4 parts of anti-sagging auxiliary agent, 0.3-1.5 parts of adhesion accelerant, 1-3 parts of anti-aging agent, 12-20 parts of ultraviolet-resistant filler, 10-20 parts of volume filler, and 8-30 parts of water. The component B comprises the following raw materials in weight part: 60-80 parts of hydrophilically modified aliphatic polyisocyanate curing agent and 20-40 parts of solvent. The topcoat coating is safe and environment-friendly, and the paint film thereof is smooth in appearance. Meanwhile, the aqueous two-component polyurethane topcoat coating is excellent in corrosion resistance and aging resistance, and simple in preparation method.

Provided is an intelligent tunnel lining trolley, characterized by comprising a door-shaped main steel frame, a concrete pouring informationized monitoring system, an end template, a template cleaningand surface lubricating system, an automatic running gear, and a layered window-by-window pouring and cleaning system. The tunnel lining trolley is simple in structure and reasonable in design, and real-time monitoring of each parameter in a concrete pouring process is realized, automation degree of equipment is improved, cleaning and template surface lubrication operation flow are simplified. The intelligent tunnel lining trolley provides convenience for on-site management and construction, and has certain environmental protection property and very high security.

The invention discloses a preparation method of a resin binder diamond abrasive product used for accurate grinding. The preparation method comprises the following steps: firstly, surface treatment is carried out on diamond abrasive material by a surfactant, the diamond abrasive material is pre-mixed with liquid resin, filler and the like, then the mixture is added into a material mixing device with accurate temperature control, and thermal mixing is carried out on the mixture at a certain temperature, so that uniform forming material with better plasticity is formed, finally, the forming material is poured into a grinding wheel forming die at a certain temperature and under a certain pressure and then is solidified under a certain condition, so that the resin binder diamond abrasive product is prepared. The resin binder diamond abrasive product prepared in the invention has the advantages that the tissues are uniform, the internal defects are less, the reliability is high, and the like, and therefore, the preparation method is particularly suitable for preparing diamond grinding wheels with fine granularity and super fine granularity in complex shapes.

The invention relates to a self-balancing external prestressing strengthening method for a bridge structure. The self-balancing external prestressing strengthening method is characterized by comprising the following steps of: carrying out interface processing at a connecting place (5) of a top flange of a concrete beam; (2) inserting reinforced bars at the connecting place (5) of the top flange of the concrete beam; (3) installing the reinforced bars at the connecting place (5) of the top flange of the concrete beam; (4) installing the reinforced bar of a steering block (6) and a diverter (9) at the bottom of the beam; (5) symmetrically adding diaphragm plates at a place far away from the end of the beam by 2-3m, and installing an anchorage device (10); (6) concreting the connecting place (5) of the top flange of the beam, the steering block (6) and the newly added diaphragm plates (8); and (7) installing and tensioning an anchoring external cable, thus obtaining a self-balancing external prestressing strengthening structure. An external prestressing system can be used for detecting and adjusting the stress of the cable at any time, inspecting the corrosion condition of the cable and can also be used for maintaining and replacing the cable when necessary. The self-compacting concrete solves the problems of dense reinforcement assembly, complex structure, narrow space of formworks and traditional structural members, cavities caused by the blocking of aggregates and the like, effectively ensures the dense degree of placing concrete and increases the strengthening effect. The self-balancing external prestressing strengthening method can be used for strengthening heavy railroad brides, concrete box girders and T beams.

The invention relates to the technical field of building construction, in particular to a measurement, control and construction method for a curved roof formwork system. Projection division is carried out on a curved surface of a concrete roof in measurement location, and the space elevation of any point on the curved surface can be accurately calculated through the coordinate plane conversion calculation formula. With the axis as the basis, the horizontal projection of the curved surface is divided into a plurality of small-specification grids, then the elevation of the grid nodes of the grids is calculated for carrying out measurement and location, and finally the grids are connected to form a smooth spatial curved surface for serving as the basis of setting up the curved roof formwork system. According to the elevation, back purlins are cut in a lofting mode, common formworks and bamboo clamp plates are used cooperatively for forming a bottom formwork of the curved roof formwork system, steel pipe cross rods are set up to support the bottom formwork, and bent steel bars are laid on the bottom formwork which is set up. According to the invention, the measurement difficulty and the construction labor intensity are lowered, the construction progress is accelerated and the construction quality is improved.

The invention relates to the technical field of concrete, and particularly relates to neutron irradiation preventing low-hydration-heat barite concrete. The neutron irradiation preventing low-hydration-heat barite concrete comprises the following components in content: 163.8-168kg / m<3> of water, 200-280kg / m<3> of cement, 90-140kg / m<3> of slag powder, 9.5-10.5kg / m<3> of boron glass powder, 850-900kg / m<3>of iron ore sand, 340-360kg / m<3> of iron sand, 1558-1600kg / m<3> of barite, 300-330kg / m<3> of barite sand, 0.85-0.95kg / m<3> of polypropylene fiber and 4% to 7% of a polycarboxylate-type water reducing agent. The neutron irradiation preventing low-hydration-heat barite concrete disclosed by the invention is larger than 3600kg / m<3> in apparent density, larger than 110kg / m<3> in retained crystal water and good in neutron irradiation prevention effect; when being applied to a large-size concrete structure of which the minimum geometric dimension is larger than 1.2m, the neutron irradiation preventing low-hydration-heat barite concrete is low in hydration heat, the internal and external temperature difference is smaller than or equal to 20 DEG C, the adiabatic temperature rise is smaller than or equal to 55 DEG C, and the neutron irradiation preventing low-hydration-heat barite concrete is applicable to a large-size radiation-proof structure. The concrete can reach relatively high requirements in aspects such as retained crystal water, fluidity, cohesiveness and water retention property and has the advantages of guaranteeing the strength and the compactness and controlling the hydration heat.

The invention relates to the technical field of biomaterials, is particularly suitable for the field of preparation of biomedical tissue engineering support materials, in particular to a method for preparing porous materials used by a tissue engineering support. The method is to adopt mechanical processing technology to prepare the porous materials, to use the porous materials in the tissue engineering support, and to provide a three-dimensional space for adhesion, growth and so on of cells. The mechanical processing method comprises laser processing technology and digital control drilling processing technology. The porous materials prepared by the mechanical processing method have a permeable porous structure, wherein the porosity is between 5 and 99 percent, and the aperture is between 50 and 900 mu m. The method can prepare various metallic materials, wherein the laser drilling technology can also prepare porous polymer materials, ceramic materials, composite materials and so on and have wide application scope.

This invention relates to soft magnetic compound materials, which are characterized by the following: the said materials comprise iron material, isolation agent and lubrication agent with their weight percentage as 92-99 úÑ, 0.5-5 úÑ , 0.5-3 úÑ; the said iron material is powder material, which comprise deoxidized powder, atomized iron powder, hydroxide powder and iron alloy with iron of 80-99.8úÑ; Particle distribution of 20-500; the said isolation agent adopts nanometer calcium carbonate powder or ceramics powder or magnetic oxidation power; the said lubrication is micro powder. The process comprises the following steps: mixing, shaping, solidifying and stainless processing.

The invention provides a prestressed mud jacking trolley and a circulating mud jacking method. The prestressed mud jacking trolley comprises a mortar pump, a high-speed pulping machine, a low-speed pulp storage barrel, a water-binder ratio test instrument, a pressure sensor, an electromagnetic flow-meter, a pulp inlet-overflow valve, a pulp return valve, a pressure regulating valve and a computer, wherein the low-speed pulp storage barrel is connected with the water-binder ratio test instrument, and is connected with the mortar pump through a pulp suction pipe; the mortar pump is connected with a prestressed pipeline of a constructed object through a pulp inlet pipe; the prestressed pipeline is connected with the low-speed pulp storage barrel through a pulp return pipe; the pressure sensor, the electromagnetic flow-meter, the pulp inlet-overflow valve, the pulp return valve and the pressure regulating valve are arranged on the pulp inlet pipe and the pulp return pipe; and the computer receives measurement data and controls the power-on and power-off of the pulp inlet-overflow valve, the pulp return valve and the pressure regulating valve through signals. The prestressed mud jacking trolley and the circulating mud jacking method have the advantages as follows: the prestressed mud jacking trolley achieves high integration and is convenient to use; the mud jacking pressure and the pulp performance can be controlled accurately; the pulp amount can be metered accurately; and the technical problem that the mud jacking in the prestressed pipeline is not full and not compact can be solved by exhausting air in the pipeline in a circulating manner.

The invention discloses a zirconia ceramic ferrule. With zirconia ceramic powder as a main material, an ethylene-vinyl acetate copolymer, an oleic acid, polymethacrylate, atactic polypropylene and paraffin are added in the mixing process, and thus the prepared zirconia ceramic ferrule is good in abrasive resistance, strong in ageing resistance, strong in environmental adaptability, and high in strength. The invention also discloses a production process of the zirconia ceramic ferrule. The process comprises the following steps: sequentially drying, mixing, preforming, crushing, injection molding, thermal debinding, sintering, grinding and the like. High-pressure low-speed injection is adopted in the injection molding process; the compactness and absence of an air hole are ensured; the preparation method is simple, easy to control, low in cost, and high in production efficiency; the pass rate of the produced product is high; and the production process is suitable for production of the zirconia ceramic ferrule.

The invention relates to a method for casting an air sucking valve steel casting part. The method comprises the steps (1) using central cross sections of flange holes on two sides of the casting part as parting surfaces, manufacturing a metal mold, using water glass quartz sand to manufacture an upper portion and a lower portion, using water glass limestone sand as back sand, using the water glass quartz sand as facing sand to manufacture sand cores and brushing zircon power coatings on the surfaces of the upper portion, the lower portion and the sand cores; (2) placing the sand cores into a cavity of the lower portion, placing outer cold irons on flange end faces of the lower portion, placing open risers and riser pads on the upper portion, placing second outer cold irons on two end faces of an inner flange of the lower portion, correspondingly placing blind risers and riser pads on the upper portion, placing inner cold irons at the valve rod hole positions of a second sand core and a fourth sand core and leading a straight pouring channel and a horizontal pouring channel of a pouring system into flange edges on two sides at the parting surface positions; (3) assembling the mold after the cores fall; (4) smelting furnace burden and pouring the casting part; and (5) performing cooling, mold opening and core falling to clean the casting part. By means of the method for casting the air sucking valve steel casting part, casting part cracks can be decreased, an internal structural of the casting part is compact, and the rate of finished products is high.