46results about How to "Stable blowing" patented technology

An impeller, a fan apparatus, and a method of manufacturing the impeller are provided. The impeller includes a support portion, a plurality of rotor blades, and a joining member. The joining member is a substantially annular member provided to strengthen the rotor blades against influence of a centrifugal force, and extends in a circumferential direction along a circle centered on a central axis so as to join the rotor blades to one another. In each of the rotor blades, a point of intersection of a leading edge of the rotor blade with a radially outer end of the rotor blade is positioned forward, with respect to a rotation direction, relative to a point of intersection of the leading edge with an outside surface of the support portion. The joining member is positioned radially inwards of the radially outer end of each of the rotor blades.

The invention provides an automatic controlling method for a converter oxygen lance used for converting low-carbon steel. The method comprises a data collecting and analyzing step, a raw material controlling step, and an oxygen lance position controlling step. The method is characterized in that: during an entire low-carbon steel converting procedure in a converter, an oxygen lance position is controlled according to the variation of the accumulated amount of oxygen in the converter; the oxygen lance position is fixed as a slagging position since the converting is started to 20% of a total converting time is reached; the oxygen lance is automatically adjusted according to a determined scheme since 20% of the total converting time is reached to 90% of the total converting time is reached; the oxygen lance position is fixed as a carbon catching position since 90% of the total converting time is reached to 100% of the total converting time is completed, and a converting end point is determined according to the decarbonization speed; when a tapping requirement is satisfied, the oxygen lance is stopped, and the converting is stopped. With the method provided by the invention, the entire converting procedure can be continuously and dynamically corrected, such that oxygen lance position automatic controlling can be realized.

An impeller, a fan apparatus, and a method of manufacturing the impeller are provided. The impeller includes a support portion, a plurality of rotor blades, and a joining member. The joining member is a substantially annular member provided to strengthen the rotor blades against influence of a centrifugal force, and extends in a circumferential direction along a circle centered on a central axis so as to join the rotor blades to one another. In each of the rotor blades, a point of intersection of a leading edge of the rotor blade with a radially outer end of the rotor blade is positioned forward, with respect to a rotation direction, relative to a point of intersection of the leading edge with an outside surface of the support portion. The joining member is positioned radially inwards of the radially outer end of each of the rotor blades.

The invention relates to an alloy structure steel 42CrMo slab and a production method thereof. The method comprises the following steps: (1) charging molten iron containing less than or equal to 0.030% of S, less than or equal to 0.120% of P and less than or equal to 0.85% of Si into a furnace; (2) smelting steel rods containing more than or equal to 0.10% of C and less than or equal to 0.008% of P in the converter at the temperature of 1650-1680 DEG C; (3) performing LF (low frequency) refining and adjusting the target values of the components, so that C is 0.41-0.43% of C, Si is 0.23-0.27%, Mn is 0.58-0.62%, S is less than or equal to 0.010%, P is less than or equal to 0.015%, Cr is 0.92-0.98%, Mo is 0.17-0.19%, Cu is less than or equal to 0.20% of Cu and Ni is less than or equal to 0.30%, wherein the discharge temperature of molten steel is 1560+45 DEG C in a first furnace and 1550+45 DEG C in a continuous casting furnace; (4) performing VD (vacuum degassing) refining under the vacuum of less than or equal to 67Pa for 15 minutes, meanwhile, performing weak argon blowing stirring of 0.15-0.20MPa, feeding 140-150m of CaSi wire with the diameter of phi13mm after breaking, and then performing weak argon blowing for more than or equal to 10 minutes, wherein the discharge temperature is 1560+/-5 DEG C in the first furnace and 1550+/-5 DEG C in the continuous casting furnace; and (5) performing continuous casting: controlling the water distribution of each secondary cooling zone of a slab caster by adopting a primary water meter, wherein the light pressing interval fs is 0.45-0.95, the distribution coefficients are shown in table 2, and the pressing quantity is 3.8mm. The method meets the production requirements of large-section 42CrMo slabs.

The invention discloses a direct injection molten iron desulphurization spray gun for a metal particle magnesium or magnesium-based or calcium-based desulphurization agent. The direct injection molten iron desulphurization spray gun comprises a connecting flange and a gun barrel which are sequentially connected and communicated, wherein the gun barrel comprises a connecting section gun barrel and a gun body section gun barrel; the connecting section gun barrel comprises a gun core; a distributor is connected with the lower end of the gun core of the gun body section gun barrel; the distributor comprises an upper end short connecting pipe, a lower end plug platform and a plurality of through holes formed in the wall of the short connecting pipe; and each through hole is communicated with a jetting pipe, and the jetting pipes are distributed in a fire-proof pouring material liner positioned outside the side wall of the distributor. The direct injection molten iron desulphurization spray gun disclosed by the invention can be used for enhancing the jetting strength, extending the desulphurization reaction area and intensifying the gasification and dissolution of metal particle magnesium through structural design, and can be used for enhancing the adaptability on low-quality metal particle magnesium and jetting desulphurization of molten iron tanks with different sizes, extending the adaptive capacity of a process and reducing the consumption cost of the molten iron desulphurization metal particle magnesium through the improvement of desulphurization process steps.

The invention relates to a frustum slit type anti-blocking ladle bottom-blown powder injection device, and belongs to the technical field of steel refining. A frustum slit type powder injection component is filled with refractory material, and four frustum-shaped slits are symmetrically distributed in the refractory material. The frustum slit type anti-blocking ladle bottom-blown powder injectiondevice realizes high-efficiency, continuous and stable injection, has high injection rate and low pulsing probability, can obviously improve uniform powder air flow delivery rate in slits, and is stable in injection, low in abrasion of air bricks, safe and reliable.

The invention discloses a method for producing nickel-based steel from high-phosphorus molten iron, and relates to the technical field of steel smelting. By adopting converter smelting, the P contentof used molten iron is 0.130% to 0.150%, by adopting a method of slag retention at the early stage and double slag at the later stage, the final smelting temperature is 1580-1620 DEG C, in the middleand later periods of smelting, the bottom stirring flow is 350-400 NL/min, the final slag alkalinity is 4.0, the final slag control amount is 10-12 tons, the converter decarburization rate is larger than or equal to 99%, and the dephosphorization rate is larger than or equal to 96%; and through LF refining, RH vacuum treatment, arc continuous casting machine pouring, by adopting TMCP rolling and ACC water cooling to 300 +/-20 DEG C, air cooling is performed to room temperature, a steel plate is heated to 550 +/-10 DEG C, tempering is performed for 3*h min, and air cooling is performed to roomtemperature. The converter process is optimized, a product is conveyed to a heating furnace to be heated after vacuum treatment and casting of an arc-shaped continuous casting machine, TMCP rolling and ACC water cooling are adopted, and after tempering treatment, performance detection is qualified.

The invention relates to a premelting composite slugging agent for a converter and a preparation method thereof. The slugging agent comprises raw materials of lime, ferric oxide powder, activated aluminum oxide powder, low-sulfur cement, silica powder and an activating agent, wherein the raw materials comprise the following components in percentage by mass: 15-35% of CaO, 15-35% of Fe2O3, 5-15% ofAl2O3, 5-15% of MgO, and not greater than 15% of SiO; and the slugging agent contains not greater than 0.25% of impurity element S. According to the slugging agent, the raw materials are environmentally friendly; the melting point is low; the slagging speed is high; the breathability of slags can be obviously improved; the splashing in the converting process is reduced; and meanwhile, the slugging effect in the converting process can be effectively improved through the slugging agent, and the converting process is stable; the slugging agent avoids re-drying and gun adhering; in addition, theend point oxygen of a converter can be decreased after the converting slugging effect is improved, so that the oxidization of the slags can be reduced; the steel iron consumption is decreased; and theproduction cost is reduced.

The invention provides a molten steel deoxidizing and microalloying method. The molten steel deoxidizing and microalloying method comprises the following steps of blowing oxygen to the top of a top-bottom combined blowing converter, blowing inert gas to the bottom of the top-bottom combined blowing converter for smelting, or blowing inert gas to the bottom of molten steel in an electric furnace for smelting; after main chemical components are qualified, blowing a deoxidizing agent to the bottom with inert gas as a carrier for refining; and when the oxygen content in the molten steel is less than or equal to 200 ppm, blowing alloyed powder into the molten steel with inert gas as a carrier for microalloying treatment, wherein the blowing amount of the alloyed powder is less than or equal to10 kg/t of the molten steel.According to the molten steel deoxidizing and microalloying method, the inert gas is blown to the bottom, and after the deoxidizing agent is blown into the molten steel todeoxidize the molten steel, the alloyed powder is blown for direct microalloying, so that components of the molten steel can be more uniform; a brand new concept is provided for directly microalloyingmicroalloy elements in the steel material production process; the microalloy elements existing in the form of solid solution can be effectively obtained out of a steel material, and thus, the steel performance is improved.

The invention provides a converter multi-mode smelting method based on a molten iron grading system. The converter multi-mode smelting method comprises the following steps: firstly, selecting grading indexes of molten iron, formulating the molten iron grading system, designing blowing modes matched with different grades of molten iron according to the different grades of molten iron, firstly obtaining components and temperature of the molten iron before charging, and selecting the corresponding blowing mode to assist in completing smelting. According to the method, the molten iron with large component fluctuation is classified based on the 'differential' thought in mathematics, the molten iron falling into the same category can be regarded as stable, the same blowing mode is adopted, stable blowing of the converter can be achieved, blowing accidents caused by large fluctuation of the molten iron are avoided, the dephosphorization effect can be improved to a certain degree, and material consumption can be reduced, the slag production amount is reduced, the smelting period is shortened, and the good metallurgical effect is achieved.

The present invention provides a linear low density polyethylene (LLDPE) resin composition for a weathering resistance agriculture film and a preparation method thereof. The resin composition comprises, by weight of LLDPE, (1) 100% of LLDPE, (2) 0.05-0.3% of a compound cross-linking aid, and (3) 10-30% of ultra-low density polyethylene (ULDPE) weathering resistance master batch. With the composition, a broad width shed plastic film (a width of more than or equal to 8 m and a thickness of more than or equal to 80 mum) can be blown out without any blending, fisheyes on the surface of the shed plastic film are less, weathering resistance is excellent, and natural damage can not occur after the shed plastic film continuously covers a greenhouse for more than 40 months. The present invention further provides a preparation method for the resin composition, wherein the preparation method has advantages of short procedure, simple process, low development cost, stable product quality and the like.

The invention discloses a gilding blowing device which is provided with an upper die table and a lower die table, a gilding plate is arranged on the upper die table, a coining steel plate is arranged on the lower die table, the lower die table is connected with a first lifting driving assembly, the gilding blowing device further comprises a blowing pipe, blowing heads are arranged on the blowing pipe at intervals, the blowing pipe is arranged on a lifting seat, and the lifting seat is movably arranged on the lower die table. When the gripper row penetrates through the upper die table and the lower die table, the lower die table ascends to conduct gold stamping operation, the second lifting driving assembly drives the lifting base and the air blowing pipe to ascend, the air blowing head is made to be higher than the lower die table, when the lower die table descends, the air blowing head blows air, and before the gripper row moves, the air blowing head is driven by the second lifting driving assembly to blow air. The second lifting driving assembly drives the lifting base and the air blowing pipe to descend, so that the air blowing head is lower than the lower die table. After gold stamping is completed, paper and a gold foil base material can be stably blown to be separated, then the paper is driven by the gripper row to be conveyed backwards, and the gold stamping quality is guaranteed.