46results about How to "Improve cleanliness level" patented technology

The invention relates to a method for producing silicon deoxygenation low-sulfur high-carbon steel through an LF refining double slag method. An electric furnace-LF-VD continuous casting technology isadopted. The method includes the steps that in the electric furnace tapping process, carbon powder is mixed firstly, then a silicon alloy and a manganese alloy are added for conducting deoxygenationalloying treatment, and lime, calcium carbide and aluminum-free refining slag are added for conducting modification treatment; secondly, after an LF enters a station, lime, calcium carbide, silicon iron and aluminum-free refining slag are added into the furnace for making high-alkalinity reducing refining slag; thirdly, low-alkalinity reducing slag is made, and the content of components in moltensteel is adjusted; and fourthly, the LF withdraws from the station after refining, VD and continuous casting processes are conducted in sequence, and the silicon deoxygenation low-sulfur high-carbon steel is obtained. The method is simple, reliable, high in operability and easy to achieve, the production cost of the whole process is reduced, the sulfur removing efficiency is high, the cleanlinesslevel of molten steel is high, the problem that when a non-molten-steel pretreatment sulfur removing process is adopted for producing high-quality silicon deoxygenation low-sulfur high-carbon steel, sulfur removing is difficult is solved well, and therefore the product quality is improved, and the economic benefits of a steel enterprise are increased.

The invention relates to a low steady-speed radial flow clean room air-conditioning air supply and return system which comprises a radial flow air supply channel device, a wall-mounted air return channel device, an air-conditioning outlet static pressure box, an air-conditioning air return port static pressure box and an air-conditioning fresh air port filtering device, the radial flow air supply channel device comprises a clean room roof, a static pressure box type air supply channel, a pressure equalizing partition plate, an arc-shaped radial flow cover, a damping layer and a high efficiency filter bank, and the wall-mounted air return channel device comprises a sandwich wall type air return duct and a filtering device mounted at an air return port of the lower end of the sandwich wall type air return duct. The air supply and return system has the advantages that the operation resistance of the air supply and return system is reduced, the diffusion speed of harmful suspended particles in a clean room is the lowest, fewer high efficiency filter banks are used, the clean room is low in construction investment, energy-saving in operation and convenient to maintain, the air cleanliness class of the clean room is improved by more than 30% as compared with that of a mixed airflow clean room, clean time can be shortened by more than 40%, and airflow in the clean room is reasonably distributed.

The invention discloses a direct drive type reversible wafer transmission robot. A lifting and dropping and swing mechanism is installed on the inner portion of a base seat, the lifting and dropping and swing mechanism is connected with one end of a big arm, the other end of the big arm is connected with one end of a small arm, the other end of the small arm is connected with one end of a reverse wrist, and the other end of the reverse wrist is connected with a vacuum adsorption tail end. When the wafer transmission robot moves, a three-connection rod which composed of the big arm, the small arm and the reverse wrist fixes a specific speed movement, and a straight line expansion movement in the radial direction is achieved; a motor is used for driving the vacuum adsorption tail end, so that a reverse movement of the reverse wrist is achieved; by the adoption of the direct drive motor to drive directly, an interior structure of the robot is simplified, the number of intermediate links is reduced, and the rotating precision and the rotating efficiency of the robot are improved. Due to fewer part mechanisms, the robot is convenient to assemble and produce. A steel belt is used rotatably, so that the rotating precision is provided, the reliability of the robot is enhanced, the production of contaminant particles is lowered, and the level of cleanliness of the robot is improved. The degree of freedom of reversing of the robot is increased by the reverse wrist, and the range of application of the robot is enlarged.

The invention provides a method for increasing the molten steel circulating flow quantity in the RH refining process and belongs to the technical field of molten steel refining. According to the method for increasing the molten steel circulating flow quantity in the RH refining process, a process procedure of converter / electric furnace-refining RH-continuous casting is adopted to produce high-quality pure steel, in the RH refining process, by means of utilization of an existing steel ladle argon bottom blowing system, argon is blown into the bottom of a steel ladle, argon bubbles blown in thebottom move along with a molten steel flow field, molten steel is lifted to enter an RH dipping pipe ascending pipe, coordinated control between steel ladle argon bottom blowing and dipping pipe inside gas lifting is realized, so that adverse effects in actual production that the air blowing hole position of an RH dipping pipe cannot be remolded and the lifting gas flow quantity is too large to blow through the molten steel inside the dipping pipe to reduce the lifting driving force instead are overcome, and the purpose of increasing the steel circulating flow quantity in the RH refining process is finally achieved. The method for increasing the molten steel circulating flow quantity in the RH refining process has the advantages of being simple and reliable, high in operability and convenient to realize, the RH circulating flow quantity is increased, the decarbonization efficiency is high, the refining time is obviously shortened, and the molten steel purity is improved.

The invention discloses a tracking analysis method for large size inclusions in steel. The method includes the steps that (1) in a tundish preparation phase, a rare earth compound is added to a coating or a ramming material of a tundish working lining; a rare earth compound is added into a tundish covering agent; and in the LD tapping process, a rare earth compound is added to a steel ladle, rareearth elements in the three rare earth compounds are different, and mold powder contains potassium oxide or sodium oxide; (2) a sample is taken and analyzed by a sample-electrolysing method to determine content of the inclusions in the steel; and (3) the inclusions selected by the sample-electrolysing method are fixed on a metal block, the morphology and composition of the inclusions are observedunder a scanning electron microscope, and sources and distribution of the inclusions in the steel are analyzed according to the contents of the rare earth elements and potassium or sodium. According to the tracking analysis method for the large size inclusions in the steel, sources and distribution of the inclusions in the steel can be thoroughly found out, targeted improvement measures are put forward for improving the cleanliness level of continuous casting slab, the production process is optimized, and the product quality is improved.

Provided is a reversible tail end assembly applied to a wafer conveying robot. A wrist shell of the robot is connected with one end of a small arm, a servo motor is installed in the wrist shell, a motor belt wheel is installed on an output shaft of the servo motor, a steel strip is connected between the motor belt wheel and a swing mechanism belt wheel, the swing mechanism belt wheel is fixed on a swing mechanism, one end of the swing mechanism is fixed in the wrist shell, the other end of the swing mechanism is connected with a vacuum adsorption tail end, and the left end of the swing mechanism is connected with a vacuum air tube joint. In other embodiments, the servo motor can also be replaced with other motors. When a wafer is adsorbed, vacuums are firstly generated in a fixed bent tube and a fixed outer tube, a vacuum can also be generated in a rotating inner tube while the rotating inner tube rotates, vacuum pressure is generated in a hollow duct of the vacuum adsorption tail end and an inner duct of a vacuum tail end connecting shaft, the wafer is adsorbed by means of a difference between internal pressure and external pressure, and vacuum pressure is generated in an inner duct of the swing mechanism while the swing mechanism rotates. Line winding is prevented, and coaxial design of a reversal action and a vacuum generation action is achieved.

The invention provides a pollution testing device and method. The pollution testing device comprises an air inlet pipe, a static pressure cavity, a filter, an operating cavity, a fixed porous plate, an air return porous plate, an air return cavity and an air return pipe, wherein one end of the air inlet pipe is connected with an external air source, and the other end of the air inlet pipe is connected with the static pressure cavity; the filter is arranged between the static pressure cavity and the operating cavity; an opening is formed in the back surface of the operating cavity; the fixed porous plate is arranged at the bottom of the operating cavity; the air return porous plate is arranged between the operating cavity and the air return cavity; and one end of the air return pipe is connected with the air return cavity, and the other end of the air return pipe is connected with the air inlet pipe. According to the pollution testing device and method, multiple pollution tests can be realized, the characteristics that the material and the motion part release particles and molecular pollutants can be tested simultaneously, and the device is diversified in functions and simple in structure.

The invention provides a baking device used for removing a trace of organic pollutants on the surface of a light machine element. According to the baking device, the organic pollutants on the surface or the sub-surface of the metal or fused quartz light machine element are baked out through an infrared baking lamp in a low-vacuum baking manner, and the organic pollutants are taken out of a vacuum box through a trace of circulating air. An air filter and an AMC filter are used for the baking device, and secondary pollution of particles and organic matter in air to the surface of the light machine element is avoided. According to the baking device, by regulating vacuum pressure and baking temperature, it can be guaranteed that the organic pollutants on the surface or the sub-surface of the light machine element are removed under the condition that the performance of the light machine element is not changed, and meanwhile a high cleanliness level is achieved. The baking device has the beneficial effects that the organic pollutant removing effect is good, the structure is simple, no secondary pollution is caused, and use is easy; and the baking device can be expanded to be applicable to the fields, such as aviation and aerospace, with high requirements for cleanliness.

The invention discloses an air purification system with high blast capacity. The system comprises an air inlet filter tank provided with a top channel at the lower end, an electric induction device arranged on the bottom of an air return channel in a transverse covering mode, an electrical charge dust collection device arranged in the air return channel at the upper end of the electric induction device, an electrostatic dust removal device transversely arranged at one end of the top channel, a first returned air filter and a second returned air filter, wherein the outlet end of the electrical charge dust collection device is communicated with the inlet end of the electrostatic dust removal device, and the outlet end of the electrostatic dust removal device is communicated with the outlet end of the air inlet filter tank. The technical problem of poor purified air blast capacity is solved.

The invention discloses a low-energy air purification system. The low-energy air purification system comprises an intake filtering unit, an air return channel, a first blade wheel, an air return filtering unit and electrostatic dust collection devices, wherein a first flow equalization device is transversely arranged at the lower end of the intake filtering unit; the air return channel is arranged in the indoor side wall; the first blade wheel is transversely arranged between the intake filtering unit and the first flow equalization device, a center rotary shaft of the first blade wheel penetrates an indoor ceiling upwards and is connected with a drive mechanism, and a bottom channel is transversely arranged at the indoor bottom; an intake opening of the air return filtering unit communicates with the indoor bottom space, and an air outlet of the air return filtering unit communicates with the bottom channel; and the electrostatic dust collection devices are arranged in the portion, on the two sides of the air return filtering unit, of the bottom channel, an inlet of each electrostatic dust collection device communicates with the bottom channel, and an outlet of each electrostatic dust collection device communicates with the bottom of the air return channel. The low-energy air purification system solves the technical problem that energy consumption is too high by means of an existing air purification system.

The invention discloses a direct drive type reversible wafer transmission robot. A lifting and dropping and swing mechanism is installed on the inner portion of a base seat, the lifting and dropping and swing mechanism is connected with one end of a big arm, the other end of the big arm is connected with one end of a small arm, the other end of the small arm is connected with one end of a reverse wrist, and the other end of the reverse wrist is connected with a vacuum adsorption tail end. When the wafer transmission robot moves, a three-connection rod which composed of the big arm, the small arm and the reverse wrist fixes a specific speed movement, and a straight line expansion movement in the radial direction is achieved; a motor is used for driving the vacuum adsorption tail end, so that a reverse movement of the reverse wrist is achieved; by the adoption of the direct drive motor to drive directly, an interior structure of the robot is simplified, the number of intermediate links is reduced, and the rotating precision and the rotating efficiency of the robot are improved. Due to fewer part mechanisms, the robot is convenient to assemble and produce. A steel belt is used rotatably, so that the rotating precision is provided, the reliability of the robot is enhanced, the production of contaminant particles is lowered, and the level of cleanliness of the robot is improved. The degree of freedom of reversing of the robot is increased by the reverse wrist, and the range of application of the robot is enlarged.

The invention discloses an air purification system adopting wet dust removal. The air purification system comprises an air return channel, an electric induction device, a spray device, an air inlet filter unit and an electrostatic dust removal device, wherein the electric induction device is arranged on the indoor top, the inlet end of the electric induction device communicates with the air return channel, and a high-voltage negative power supply is arranged in the electric induction device; the inlet end of the spray device communicates with the outlet end of the electric induction device, and an air cleaning agent is arranged in the spray device; the outlet end of the air inlet filter unit is arranged on one side of the outlet end of the spray device, and the inlet end of the air inlet filter unit communicates with an air inlet of an air conditioning system; and the inlet end of the electrostatic dust removal device is arranged on the other side of the outlet end of the spray device, and the outlet end of the electrostatic dust removal device communicates with the indoor top space. According to the air purification system, the technical problems of poor dust removal effect of the air purification system and difficulty in increasing the quality of indoor air are solved.

The invention discloses a secondary charged dust removing air purification system. The secondary charged dust removing air purification system comprises a return air channel, an electric induction device, a charged dust collection device, an inlet air filter unit and an electrostatic dust removing device, wherein the electric induction device is arranged at the top of the interior of a room; the inlet end of the electric induction device communicates with the return air channel; the electric induction device is internally provided with a high-voltage negative power source; the inlet end of the charged dust collection device communicates with the outlet end of the electric induction device; direct current high voltages are connected to the upper side and the lower side of the charged dust collection device; the outlet end of the inlet air filter unit is arranged on one side of the outlet end of the charged dust collection device; the inlet end of the inlet air filter unit communicates with an air supply outlet of an air conditioning system; the inlet end of the electrostatic dust removing device is arranged on the other side of the outlet end of the charged dust collection device; and the outlet end of the electrostatic dust removing device communicates with a space at the top of the interior of the room. According to the secondary charged dust removing air purification system, the technical problem that fine dust in air cannot be effectively filtered is solved.

The invention discloses a smelting method for producing IF steel with low oxygen level in the whole process, and belongs to the technical field of iron and steel smelting. The steps of the present invention are as follows: step 1: slag dumping at the end of converter steel smelting, leaving 10-15 tons of slag in the converter, adding 50-100 kg of coke powder to remove oxygen in the slag, and then performing slag splashing to protect the furnace; step 2: charging the converter ;Step 3: Converter main blowing; Step 4: After the converter main blowing, measure the molten steel temperature and carbon content through the sub-lance, and control the auxiliary blowing oxygen amount according to the measured value; Step 5: After the auxiliary blowing, before tapping Bottom blowing for 30 seconds; Step 6: Converter tapping; Step 7: Molten steel enters the RH process; Step 8: After the ladle is lifted, turn on the vacuum pump to vacuum and decarburize. The invention can reduce the degree of peroxidation of molten steel in converter tapping, reduce the oxidizability of ladle top slag, and reduce deoxidized inclusions Al 2 o 3 The amount of production is increased, the cleanliness level of molten steel is improved, and the cost is reduced, which has significant economic benefits.

The invention discloses an air purification system for circulating cyclone dust removal, comprising: an air inlet filter unit, the lower end of which is provided with a top passage; The upper end of the top passage is connected, and the outlet end of the cyclone mixing device is connected with the top passage; the air washing device, the indoor return air processed by the cyclone mixing device is sent into the air washing device; the first round A wind filter, which is arranged in the center of the bottom of the room, and the first return air filter communicates with the air inlet of the air conditioning system; and a second return air filter, which is arranged on both sides of the indoor bottom, and the second return air Filters deliver conditioned room air directly to the cyclonic mixing unit. The invention solves the technical problems of large net occupation space and low processing efficiency of the air purification system.

The invention discloses an air purification system with high blast capacity. The system comprises an air inlet filter tank provided with a top channel at the lower end, an electric induction device arranged on the bottom of an air return channel in a transverse covering mode, an electrical charge dust collection device arranged in the air return channel at the upper end of the electric induction device, an electrostatic dust removal device transversely arranged at one end of the top channel, a first returned air filter and a second returned air filter, wherein the outlet end of the electrical charge dust collection device is communicated with the inlet end of the electrostatic dust removal device, and the outlet end of the electrostatic dust removal device is communicated with the outlet end of the air inlet filter tank. The technical problem of poor purified air blast capacity is solved.

The invention relates to a method for producing silicon deoxygenation low-sulfur high-carbon steel through an LF refining double slag method. An electric furnace-LF-VD continuous casting technology isadopted. The method includes the steps that in the electric furnace tapping process, carbon powder is mixed firstly, then a silicon alloy and a manganese alloy are added for conducting deoxygenationalloying treatment, and lime, calcium carbide and aluminum-free refining slag are added for conducting modification treatment; secondly, after an LF enters a station, lime, calcium carbide, silicon iron and aluminum-free refining slag are added into the furnace for making high-alkalinity reducing refining slag; thirdly, low-alkalinity reducing slag is made, and the content of components in moltensteel is adjusted; and fourthly, the LF withdraws from the station after refining, VD and continuous casting processes are conducted in sequence, and the silicon deoxygenation low-sulfur high-carbon steel is obtained. The method is simple, reliable, high in operability and easy to achieve, the production cost of the whole process is reduced, the sulfur removing efficiency is high, the cleanlinesslevel of molten steel is high, the problem that when a non-molten-steel pretreatment sulfur removing process is adopted for producing high-quality silicon deoxygenation low-sulfur high-carbon steel, sulfur removing is difficult is solved well, and therefore the product quality is improved, and the economic benefits of a steel enterprise are increased.

The invention discloses a low-energy air purification system. The low-energy air purification system comprises an intake filtering unit, an air return channel, a first blade wheel, an air return filtering unit and electrostatic dust collection devices, wherein a first flow equalization device is transversely arranged at the lower end of the intake filtering unit; the air return channel is arranged in the indoor side wall; the first blade wheel is transversely arranged between the intake filtering unit and the first flow equalization device, a center rotary shaft of the first blade wheel penetrates an indoor ceiling upwards and is connected with a drive mechanism, and a bottom channel is transversely arranged at the indoor bottom; an intake opening of the air return filtering unit communicates with the indoor bottom space, and an air outlet of the air return filtering unit communicates with the bottom channel; and the electrostatic dust collection devices are arranged in the portion, on the two sides of the air return filtering unit, of the bottom channel, an inlet of each electrostatic dust collection device communicates with the bottom channel, and an outlet of each electrostatic dust collection device communicates with the bottom of the air return channel. The low-energy air purification system solves the technical problem that energy consumption is too high by means of an existing air purification system.

The invention relates to a production method for silicon deoxidation low-sulfur high-carbon steel. An electric furnace-LF-VD-continuous casting process is adopted. The production method comprises thesteps that 1, in the steel tapping process of an electric furnace, carbon powder is added firstly, then a silicon alloy and a manganese alloy are added for deoxidation alloying treatment, and then lime, calcium carbide, aluminum-free refining slag are added to conduct modification treatment on slag; 2, after an LF enters a station, reductive refining slag is made; 3, after it is determined that the sulfur content in molten steel is controlled to be under a target value, the content of all components in the molten steel is adjusted to be within the required high-carbon steel component range; and 4, the LF leaves the station after refining, VD and continuous casting processes are sequentially conducted, and the silicon deoxidation low-sulfur high-carbon steel is obtained. The production method is provided under the overall background of the molten-iron-free pretreatment desulfurization process in traditional smelting production of the silicon deoxidation low-sulfur high-carbon steel, thelimit of production of the silicon deoxidation low-sulfur high-carbon steel through the molten-iron-free pretreatment desulfurization process on equipment is overcome, in the LF refining process, therefining slag with the specific components and properties is smelted, and the dual purposes of efficient desulfurization of the molten steel and plastification control over inclusions are realized.

The invention discloses an air purification system capable of removing dust efficiently. The air purification system comprises an air return channel, a top channel, an air inlet filter bank and an electrostatic dust removal device, wherein the bottom of the air return channel is communicated with the interior of a room, the top channel is communicated with the top of the interior of the room, an electrical charge device is arranged in the top channel, the top of the air return channel is communicated with the inlet end of the electrical charge device, and a first through hole and a second through hole are oppositely formed in the center of the top channel; the inlet end of the air inlet filter bank is communicated with an air feeding port of an air regulation system, and the outlet end of the air inlet filter bank is arranged in the first through hole; the inlet end of the electrostatic dust removal device is arranged in the second through hole, and the outlet end of the electrostatic dust removal device is communicated with the top space in the room; the electrical charge device is connected with alternating high voltage, and the electrical charge device and the outlet end of the air inlet filter bank are gathered at the inlet end of the electrostatic dust removal device. The technical problem of low dust removal efficiency is solved.