53results about How to "Guaranteed cleanliness requirements" patented technology

The invention relates to medium-carbon alloy cast steel shots and a manufacturing method thereof, which is characterized in that, each medium-carbon alloy cast steel shot comprises the following chemical components in percentage by mass: 0.35 percent of carbon, 0.11 percent of silicon, 0.45 percent of manganese, 1.2 percent of chrome, 0.015 percent of sulfur, 0.020 percent of phosphor and the balance of iron and inevitable impurities. The manufacturing process comprises the following steps of: mixing and smelting, namely, smelting the raw material composition mixed proportionally into liquid steel, pouring the liquid steel into a tundish and performing deoxygenation by adopting an deoxidant; preparing shots by a centrifugally forming method, namely, pouring deoxygenized liquid steel into a centrifugal disc which rotates at a high speed, throwing out the liquid steel under the action of a centrifugal force to make the liquid steel fall into a cooling water pool, and taking the liquid steel out and drying the cooled steel to obtain formed cast steel shots; and performing heat treatment, namely, heating the formed cast steel shots until the temperature reaches 860 to 880 DEG C, performing cold quenching after keeping the temperature for 20 to 40 minutes, tempering for 40 to 80 minutes at the temperature of between 350 and 500 DEG C, and after tempering, cooling rapidly by a steel plate vibrating screen water cooling method to produce the medium-carbon alloy cast steel shots. The medium-carbon alloy cast steel shots and the manufacturing method thereof have the advantages of guaranteeing the high rigidity of the steel shots, avoiding crack generated in the centrifugally forming process and the heating tempering process, improving the toughness and the like.

The invention relates to the field of ventilation systems, in particular to a bidirectional automatic dust removal and intelligent ventilation system and a bidirectional dust removing method. The bidirectional automatic dust removal and intelligent ventilation system is arranged in a communication computer room and is provided with a dust removing outlet and an air supply outlet. The bidirectional automatic dust removal and intelligent ventilation system comprises an air supply unit, a dust removing unit, a control system, an air conditioner, a mixed air supply duct, an air exhaust duct and an air hood. The air supply unit brings a micro positive pressure environment for the computer room during air supply so as to automatically exhaust hot air of the communication computer room and remove dust of a strainer at the same time; and the air supply unit brings a micro negative pressure environment for the communication computer room during air exhaust and dust removal so as to pump outdoor cold air into the communication computer room. The bidirectional automatic dust removal and intelligent ventilation system has the advantages of reducing the hardware cost of the system, and reducing the use cost and maintenance cost of the system. The air exhaust unit is not provided with an air blower, so that the failure rate of the air exhaust unit due to the damage of the air blower is reduced, the energy efficiency ratio of the whole system is improved, and the energy consumption of the whole system in normal use is reduced.

The invention discloses a big-thickness slab manufacturing technique belonging to the technical field of ferrous metallurgy. According to the technique, more than two continuous casting slab blanks are overlapped, and then the four sides of the blanks are combined and welded by using a combined welding technique of gas shielded welding, submerged-arc welding and electron-bombardment welding so as to form one big-thickness slab. The invention breaks through the limit of complex manufacturing process, no guarantee in inner quality or low production efficiency in the traditional big-thickness slab manufacturing technique and provides a method for producing a big-thickness slab with high quality and high efficiency by using the traditional continuous cast slab blanks, and the method is simple in operation, small in investment, high in production efficiency, flexible in organization form, capable of well satisfying the requirement of a raw material used for producing the big-thickness slab with high piece weight and high compression ratio and realizing mass industrial production, and especially suitable for the production of the big-thickness slab with the thickness of more than 600mm, and is widely applied to the manufacturing of high-quality super-thick steel plates used for various important technique equipment.

The invention discloses a technique for manufacturing a 150-400mm thick carbon constructional steel plate by using continuous casting slabs, belonging to the field of metal materials. The continuous casting slabs subjected to converter steelmaking and secondary refining are used in the technique; and the chemical components of the slabs include 0.14-0.20wt% of C, 0.20-0.50wt% of Si, 0.08-1.40wt% of Mn and less than or equal to 0.010wt% of S; at least two continuous casting slabs subjected to surface machining and cleaning are overlapped, four sides of the continuous casting slabs are combined and welded to form a big-thickness blank, the blank is arranged in a bogie-type furnace or a soaking pit furnace for heating, and then is rolled, water-cooled and subjected to heat treatment after being discharged from the furnace so as to produce the 120-400mm thick carbon constructional steel plate. The technique has the following characteristics of simple production process, high yield, high ultrasonic flaw detection rate of more than 98% and excellent performance.

The invention discloses a production method of rack steel for a self-elevating oil extraction platform, and belongs to the field of metal materials. At least two continuous casting sheet billets are used as raw material. The continuous casting sheet billets are welded into billets with large thickness by combining gas shielded welding, submerged arc welding, and vacuum electron beam welding or full-vacuum electron beam welding. The billets with large thickness are heated in a bogie-type furnace or a soaking furnace. The heated billets are rolled through a heavy plate mill, water-cooled, and heat treated to obtain the rack steel for the self-elevating oil extraction platform. The rack steel produced by the method is fine in steel plate comprehensive mechanical performance, high in operability, low in cost, and high in production efficiency.

The invention discloses an air conditioning monitoring system which is applied to semiconductor cleaning equipment. The system comprises a main frame, a fan unit, a fan fixed support, a wind uniformizing device, an adjustable laminar flow device, a gas pressure sensor, a static impedance device, a static monitor and an air cleanliness test device. The air conditioning monitoring system is mainly used for eliminating various pollution sources in the internal environment of a semiconductor cleaning machine to cause the internal part of the semiconductor cleaning machine to be always in a steady laminar flow environment with a constant pressure value, effectively prevents and removes particles and dust in the air, conveniently knows the internal cleanliness of equipment, and effectively eliminates static electricity generated in the internal part of the equipment, therefore the possibility that silicon wafers are polluted by critical defects is reduced, finally, the rate of finished products of chips is increased, and the production cost of electron parts and components is reduced.

The invention discloses a conveying device conveying remaining glass bottles in a bottle outlet opening of a sterilizing dryer to a filling machine. The conveying device comprises a rack, at least one linear driving mechanism installed on the rack, at least one elevator mechanism and at least one bottle-pushing block, wherein the elevator mechanism is driven by the linear driving mechanism to perform linear reciprocating motion, and the bottle-pushing block is connected with the elevator mechanism and driven by the linear driving mechanism and the elevator mechanism to go up and down and carry out linear bottle-pushing motion. A sliding block in a screw rod sliding block mechanism is driven through a motor to perform the linear reciprocating motion, and a lifting air cylinder is also driven to perform the linear reciprocating motion. The lifting air cylinder drives the bottle-pushing block to perform linear lifting motion and convey the glass bottles into the filling machine smoothly. Not only is unnecessary manpower reduced, but also contamination to the bottles is avoided, and requirements for cleanliness of the glass bottles are ensured.