Abstract: The present invention relates to a process for separating 2,7-DMN, characterized in that a mixture containing at least 50% by weight of 2,7-DMN and the other DMN isomers obtained by preliminarily concentrating a fraction in the range of 250.degree.-270.degree. C. of catalytically cracked petroleum oil is preliminarily adjusted to a temperature of 60.degree.-90.degree. C. to form a slurry containing the crystal of 2,7-DMN, which is placed in a tightly sealed pressure vessel, adiabatically pressurized to the range of 500-2,500 kgf/cm.sup.2 and solidified to form a state of co-existing of solid and liquid phases, liquid is then discharged under pressure from the solid-liquid co-existing system, the solid remaining in the vessel is pressed to discharge the liquid remaining between the solid particles, which are integrated to give 2,7-DMN having a purity of 98% by weight or more.

Abstract: The instant invention is an improvement in the method of producing optically pure sterioisomers from a racemic mixture. The method is based on the well-known fact that a supersaturated solution or melt of the racemic mixture can be seeded with just the crystals of the desired stereoisomer, which will then crystallize out selectively, leaving the undesired stereoisomer behind in the liquid mother liquor. The desired isomer, in crystaline form, can then be separated by simple liquid/solid separation from the undesired isomer remaining behind in the mother liquor. In the conventional method, supersaturation is achieved by careful cooling of a saturated solution or melt. In the present invention, supersaturation is achieved by increasing the ambient pressure over the saturated solution or melt of the racemic mixture, and relying on the fact that the melting temperature of a substance increases with increasing pressure, provided there is an increase in molar volume when the substance melts.

Abstract: In a method of controlling the pulverization and dryness of a flammable material such as coal, the system is provided with both a push blower upstream from the pulverizer and a pull blower downstream from the pulverizer. The system is controlled so as to maintain the pressure within the pulverizer at an average equal to substantially the atmospheric pressure. In the method for controlling the pulverizing rate, a preset desired differential pressure across the pulverizer is maintained constant while the pulverizing motor speed and the pulverizing material feed rate are modified.

Abstract: A master/slave fluid-pressure apparatus having a first valve respective to angular movement of a master arm for producing fluid pressure which is applied as a pilot pressure to shift a closed-center three-position directional valve in one direction, which then allows a fluid-pressure actuator to be operated to cause a slave arm to follow the master arm in angular motion. The angular movement of the slave arm actuates a second valve coacting therewith to develop a fluid pressure which is applied as another pilot pressure to the directional valve. When the fluid pressure from the second valve reaches a predetermined point, the directional valve is shifted in the opposite direction to stop operation of the fluid-pressure actuator. The first and second valves may either be pressure reducing valves or relief valves.

Abstract: A method for controlling combustion of atomized fuel in industrial furnaces, in which flame radiation and temperature distributions in a furnace are controlled into optimum conditions in terms of heat efficiency by adjusting a feed rate of an atomizing medium and/or a distal end position of a burner.

Abstract: A method for injecting a pulverized fuel into a blast furnace uses a pulverulent fuel injecting burner which is protruded into a blow pipe through a wall thereof near the tuyere of a blast furnace. The burner injects a pulverized fuel into the blast furnace along with a hot blast of air at a temperature higher than 950.degree. C. flowing through the blow pipe. The tip end of the burner is located at a distance L between 100 and 350 mm upstream from the boundary between the tuyere of the blast furnace and the blow pipe. According to one embodiment, the tip of the furnace is tapered by an angle .theta..ltoreq.1400L.sup.2 -1290L+295. According to a second embodiment, the inner diameter B.sub.1 of the blow pipe, and the inner and outer diameters of the burner tip (d and D) are selected such that 0.1.ltoreq.(D/Bi).ltoreq.0.25 and 0.6.ltoreq.(d/D).ltoreq.0.8. According to a third embodiment, the burner tip is removable.

Abstract: A flux-cored welding electrode for gas-shielded arc welding comprising a mild steel sheath and a flux core, said flux core having the following composition based on the total weight of the electrode:TiO.sub.2 -4 to 8.5%Mg-0.2 to 0.8%Ti-0.03 to 0.7%B-0.002 to 0.025%Mn-1.0 to 3.0%Si-0.01 to 1.2%Metal fluorides-0.1 to 0.30% as F-contentOxides-not more than 8.5%, including TiO.sub.2.

Abstract: A method an apparatus for combustion with a minimum of NOx emission in various industrial furnaces and boilers. By injecting air for combustion into a furnace through the burner tile or air baffle in the deviated flow pattern asymmetrical with respect to the burner tile or baffle axis, the quick mixing of the air and fuel in early stages of combustion is suppressed to provide for a relatively gentle combustion and allow the burnt gas self-circulation to take place effectively, thereby minimizing the emission of nitrogen oxides.

Abstract: This invention discloses a method of vibrating coiled wires in a circumferential motion in a solution bath. The method comprises the steps of suspending a set of coiled wires from a hook whose supporting portion extends parallel to a beam and which is secured to the underside of the beam supported on shock absorbing members, vibrating the beam and the hook by at least one rotary vibrator whose rotating shaft is placed on and parallel to the beam and whose direction of vibration varies continually and cyclically in the plane perpendicular to the beam, and transmitting the vibration of the rotary vibrator to the coiled wires through the hook so that the coiled wires suspended from the hook are rotated along the circumferential direction in the solution bath.

Abstract: Disclosed is a method for the automatic, nondestructive, measurement of the eccentricity of a core wire in a coating composition coated upon an electrode, the measurement being formed by at least two sets of optical means, each including a light source and a line sensor. One of the optical sensors is positioned to measure the diameter of a coated portion of the core wire while at least one of the remaining sensors is positioned to measure the diameter of an uncoated portion. The positions and diameters of both portions are compared to find the eccentricity of the core wire. Where three sensors are used to measure the position and thickness of the exposed wire portion, the eccentricity of a misaligned or bent rod can be determined.

Abstract: An anticorrosive treatment for preventing white rust on galvanized steels, comprises applying to the surface of a galvanized steel sheet an acidic solution containing molybdic acid or a molybdate in a concentration of 10-200 g/l calculated as molybdenum and adjusted to a pH value of 1-6 by addition of an organic or inorganic acid.

Abstract: Arm having a gravity-balancing function effective for use in welding robots as well as robots employed in a variety of industrial fields. Projectively provided over the fulcrum of an arm (1) is a rotary sheave (2), whose position is perpendicularly maintained regardless of the vertical swaying of the arm (1). A wire (6) is extended from an action point (A) on a line traced by the center of gravity of the arm (1), to the rotary sheave (2), and is connected to a spring mechanism (3) which may extend by the length of elongation equal to the distance between the action point (A) and the rotary sheave (2), whereby a moment due to the weight of the arm (1) is completely balanced to provide an arm with gravity-balancing.

Abstract: Disclosed is a method and apparatus for cold-working annular workpieces by applying thereto an internal fluid pressure to cause an enlargement of the diameter thereof through plastic deformation, in which the openings at opposite ends of an annular workpiece are closed by a pair of presser plates through packings which are radially expansible along with the annular workpiece. The contacting surface pressure of the packings and presser plates are controlled to a predetermined value by an arithmetic unit operating on detected values of a main pressure acting internally on the annular workpiece, an auxiliary pressure pressingly holding the presser plates against the respective packings and varitions in the shape of the annular workpiece undergoing the plastic deformation.

Abstract: A method and apparatus for the controlled cooling of a hot rolled steel rod. A hot rolled steel rod issued from a final stand of mill train is rapidly cooled, and then formed into a coil. The coiled rod is transported in a generally horizontal direction with its loops held at an angle of 30.degree. to 60.degree. relative to the direction of transportation and with a pitch of at least 2d/sin .alpha. where d is a diameter of the rod and .alpha. is the above-mentioned angle. A cooling medium, e.g. air, is forcibly applied to the coiled rod upwardly from below the coiled rod to cool the coiled rod uniformly at such a cooling rate as to achieve a phase transformation to obtain a structure consisting essentially of fine pearlite. The apparatus includes a cooling device for the rapid cooling, a laying head for the coil forming, a conveyor for transporting the coiled rod while supporting its loops at the angle and pitch, a coolant supply, and a mechanism for collecting the treated rod.

Abstract: Iron ore pellets having superior reduction and load softening properties in blast furnace operations. The pellets are prepared from a raw material to which is added an amount of magnesia or a MgO feeding source such as that the ratio of MgO to the SiO.sub.2 content of the raw material is at least about 0.5 and the CaO content in the raw material is adjusted so that the ratio CaO/SiO.sub.2 is less than about 0.05.

Abstract: A recovery type flux feeding assembly is disclosed. The assembly includes a virgin flux hopper and a waste flux hopper with a flux feed conduit connected to the bottom of the waste flux hopper. The hoppers are separated by a drop stop which selectively permits flux from the virgin flux hopper to enter the waste flux hopper so that the flux exiting through the flux feed is a mixture of the two. A flux return assembly consists of a flux recovery port positioned adjacent the waste flux from the weld, a cyclone attached to the top of the waste flux hopper and a conduit connecting the two. An air injector injects air into a midpoint of the conduit between the flux recovery port and the cyclone so that the cyclone is kept at a positive pressure and the waste flux therein is not sucked out. Conduits are included between the tops of the hoppers for equalizing the pressures therebetween.

Abstract: A melting flux composition for submerged arc welding which comprises 6-15% by weight of MgO, 5-10% by weight of CaO, 10-20% by weight of CaF.sub.2, 14-19% by weight of Al.sub.2 O.sub.3, 20-25% by weight of TiO.sub.2, 15-20% by weight of SiO.sub.2, and 5-10% by weight of MnO. Optionally, the composition further comprises B.sub.2 O.sub.3 or other oxide components, such as iron oxide and alkali metal oxides.

Abstract: A method for preventing a leakage loss of gases in an oil-free screw type rotary compressor including a housing, a rotor assembly comprising a pair of male and female rotor members rotatably mounted within said housing and a cooling jacket surrounding said housing, said housing and said pair of male and female rotor members defining therebetween an axially progressive series of sealed cavities for a gas, which method comprises the steps of returning as cooled a leakage gas from rotor shaft seals on the discharge side of said compressor to a first of said axially progressive series of sealed cavities, the leakage gas being returned to the compressor at a point where the suction cycle has been completed and the compression cycle has yet to begin.

Abstract: An apparatus for evaporating ordinary temperature liquefied gases. The apparatus includes an ordinary temperature liquefied gas storing vessel, an evaporating chamber for evaporating a liquefied gas, and a liquid level detecting chamber for detecting the liquid level in the evaporating chamber. The detecting chamber is disposed between the storage vessel and the evaporating chamber. The liquid outlet from the storage vessel and detecting chamber are connected together by a conduit equipped with a liquid pressure reducing valve, the bottom of the detecting chamber and the liquid inlet to the evaporating chamber are connected together by a liquid conduit, and the respective gas outlets from the detecting chamber and evaporating chamber are connected to a gas warming chamber.

Abstract: A method for warm forging a cup-shaped piece is disclosed. In warm forging a blank is heated between 400.degree. and 800.degree. C. and is inserted within a die having a cross sectional area substantially larger than that of the blank. The ends of the blank are clamped between a recess in the die and a recess in an upsetting punch and the upsetting punch compresses the blank until its sides become sufficiently bulged to almost touch, or touch, the sides of the die. The upsetting punch is then removed and a backward extruding punch is press fitted into the bulged blank and the blank is extruded to form a cup. The extrusion punch is lubricated and cooled by lubricant and coolant applicators at a position remote from the die so that the blank is not prematurely cooled by the coolant.