SU66397A1 - Conveyor machine for continuous casting of steel into ingots - Google Patents

Description

The known conveyor machine for the continuous casting of steel into ingots, consisting of the upper and lower conveyors, having a tooth on the rear side, forming a lath, to the links of which half of the molds are attached, has significant drawbacks. It is made of a very high height, has a very low productivity, gives smudges in ingots, etc.

The proposed machine is characterized in that the channel inlet is located at an angle providing the pressure of the metal. The front part of the lower conveyor, forming the inlet part of the channel, is made concave, and the top is convex. In the machine, a special mechanism is used to force-seal the joints of the molds over the channel. It consists of gears interlocking with the slats in pairs and placed at the ends of the channel. Gears located at the inlet end of the channel rotate in the direction of movement of the channel, and gears located at the output end of the channel in the opposite direction. This eliminates the disadvantages of the known machine, both; bakes sufficiently tight seams and eliminates the possibility of gaps.

FIG. 1 shows the proposed conveyor machine (general view); in fig. 2 and 3 — the mechanism of forced compaction of the joints of molds in fig. 4 is a section along the line A-A in FIG. one; in fig. 5-front part of the machine with casting device; in fig. 6-mechanism automatic control of the speed of movement of the machine.

The machine consists of two chain conveyor belts 7 and 2, bearing on itself the halves of 3 molds. In the working (filled) area, the upper branch of the lower conveyor 2 slides along parallels 4 curved along the curve. The lower branch of the upper conveyor lies on the working part of the lower conveyor and the halves of the molds, laying one on top of the other.

form a channel of shaped section corresponding to a given profile of the cast ingot. The location of the machine is such that the top color of the axis of the cast channel is close to the vertical, and the axis of the lower part of the channel goes to the horizontal. The ingot obtained by pouring the channel on leaving the car with its own weight is rectified, moving along the horizontal roller table without harm to its integrity. Such an arrangement of the machine allows casting at high speeds with strictly limited small hydrostatic pressure inside the ingot, which makes the casting process completely safe. The transverse gaps between the molds, necessary for thermal expansion of the conveyor chains, are set tightly without loading, and the drive with a special sealing mechanism. The ANFTA 5 (Fig. 2, 3) sits on the key on the shaft 6. It has a spring connection with the coupling 7, which is rigidly mounted on the sleeve 8. Freely rotating on the shaft 6H on the sleeve S, an asterisk 9 for the chain 10 Gal. At the other end of the shaft 6, a gear wheel is seated on a key; it is engaged with teeth 12 on the back surface of the links of the conveyor. Chain 10 Gall is transferred to the sprocket 13, which is rigidly mounted on Ba; iy 14. On the shaft 14, a gear 15 is seated on a key and is coupled to the teeth 12. The springs 16 are connected to the flanges 5a w7a of the couplings 5 and 7. The coupling 7 with an asterisk 9 Gall chains, which sit on a common hub,. mounted freely on the shaft 6, the sprocket 13, the shaft 14 and the gear 15 under the action of the same spring 16 rotate in the direction opposite to the rotation of the shaft 6, the coupling 5 and gears //. The reaction of the compressed spring 16 tends to turn the coupling 5, and with it the shaft 6 and the gear //, in the same direction. Thus, the gears // and 15 years, by the influence of the spring 16, will rotate in opposite directions towards each other, stretching the lower branch of the Gall chain and causing the conveyor link to move in the area between the gears // and 15 towards each other, compacting it, , the gaps between the molds on the entire filled area of conveyors. The forced sealing of the gaps does not interfere at all with the expansion of the molds, leaving the gaps all the time compressed due to even greater compression of the springs 16.

The filling device of the machine (Fig. 5) consists of a mixing-type bucket 18, swinging around axis 19 with a double rack support 20, supporting trunnion 21. The tilt of the bucket is driven by motor drive onto the support rails. The bucket 18 has in its lower part an outlet nozzle 22, covered by a stopper 23. In the open upper part of the channel, formed by conveyors, a trunk 24 of the sprue bowl 25 is inserted. The trunk and the bowl have a refractory lining. The trunk ends with a dosage nozzle 26 of high refractory material. To automatically control the speed of the car, a mirror is attached to the trunk; The periscope 27 (Fig. 6), having a head with an inclined metal mirror 28, is set at an angle of 140 °. At the turn of the periscope tube, a second mirror 29 is installed at an angle of 45 °. Outlet end 30 of the periscope is blocked stack.: | lentil 31. Cold gas is injected into the tee 55, the purpose of which is to prevent the periscope of the hot gases emitted from steel from entering the periscope tube by cooling it with a mirror 28 and, at the same time, creating a neutral environment; of izchenii of scissors. The light beam from the meniscus of the liquid steel in the molds is transmitted by reflection in the mirrors on photoelectric 33, and the latter controls the servo motor to adjust the speed of the machine.

The drive of the machine acts on the axis of the upper sprocket 34 and 35.

conveyor connected gears. In order to control the speeds of the machine, the drive is built according to a Leonardi circuit with a DC motor. The drive can also be carried out with the help of a friction reducer or a hydraulic clutch, which, like Leonardi’s, can be controlled within wide limits. To deoxidize the steel with an additive to the aluminum sprue, an automatic aluminum metering unit is installed on the machine, consisting of a coil 36 (Fig. 5) for winding aluminum wire, driven with a notched surface of the roller 37 and a pressure roller 38. The driving roller 37 receives movement through the gearbox 39 Gall 40 chains from the shaft of the sprocket 4S, which sits on the shaft of the upper star of the 4 machine conveyors. The wire from the coil 36 is laid by 37 driven rollers and 38 rollers. As the drive roller is rotated, a wire 42 is imparted with a forward motion, the end of which is charged into the runner 25, where the aluminum melts, and the steel is increased. To cool the returning molds, after the stripping of the ingot, the spray arms 43 are installed. The sprayers are arranged so that the water spreads into a mist. This circumstance makes it possible to obtain a large thermal effect at low water consumption.

Molds are covered with soot before pouring with the help of burners 44 installed in the front of the machine.

The first section of the receiving roller table rests on the springs and under the frame of the roller table attached an electric motor with an unbalanced flywheel. The purpose of this motor is to create vibration of an ingot passing through the roller table, while another ingot represents a crust of hardened steel. Filled in the middle with liquid metal. Vibration SLC-accelerates the crystallization process and disintegrates the growing long-axis dendrites. For this purpose, a microvibrator can be applied, if necessary.

Before pouring, the cup 22 and the nozzle 26 are installed, having dimensions in accordance with a given arbitrariness, efficiency. The ladle is heated by oil or gas nozzles, and the trunk trunk 24 of the sprue bowl is equipped with a 25-electric heating coil of resistance between the lining and the casing. The stopper 23 is closed. A cast iron seed of equal size with the channel formed by the molds is laid in the canal of the machine. The purpose of the seed is to create a temporary bottom in the channel open at both ends.

The xMetal from the kiln is fed in an ordinary ladle and moves as fast as possible into the / 5 mixer ladle. The mixer is given the appropriate slope required to create the desired head that provides the specified machine performance. After that, a quick jerk opens the stopper 23, which is not used throughout the casting process. The metal jet fills the sprue cup 25 and through the trunk 24 is poured into the molding channel. At the moment when the channel starts to fill with liquid metal, the conveyor belts are launched into operation with a speed corresponding to the amount of flowing metal. The height of the metal head remains at the same level in the runner bowl throughout the entire process, thus guaranteeing the constancy of the amount of metal entering the machine. Maintaining a constant level in the runner bowl is made by changing the inclination of the bucket 18, i.e. by changing the pressure on the free hole in the glass 22. Having a fixed factor in the subsequent process, the steel debit, the movement of the conveyors strictly subordinate to this factor

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No. 66397

speed controller so that the level of liquid steel is strictly at the same level as the trunk, and the end of the refractory nozzle 26 is flooded all the time to the required depth to prevent air from being ejected into the metal and to avoid the development of a wave on the surface of the steel mirror, which, by washing cold mold molds, can create captives that spoil the surface of the ingot. The liquid steel during the working area crystallizes around the walls of the molds, and, at the time of stripping, the ingot is a box with the walls of the hardened steel with a liquid core. Upon leaving the machine, the ingot is vigorously irrigated with water to accelerate the crystallization of the ingot. But irrigation of the ingot with water should not cool it below 1200 °.

The speed control of conveyors, in order to maintain the level of steel in the molds, is done automatically using a mirror periscope. The luminous meniscus of the steel on the verge with the mold is reflected by the mirror 28 to the mirror 29, and from here through the lens 57, acting on the photocell 33, the servomotor connected to the excitation regulator of the Leonardi B installation of one or the other side works.

The ingot axis in the machine is in the shape of an arc, but when the ingot leaves the machine, the latter straightens with its own gravity on a horizontal non-forced roller table, along which it rolls up to a pair of scissors.

Subject invention

Claims (3)

1. A conveyor machine for the continuous casting of steel into ingots, consisting of upper and lower conveyors, fitted on the rear side with rail-forming teeth, with halves of molds attached to the links, characterized in that the channel inlet is angled. metal. 2. The form of execution of the conveyor machine according to claim I, characterized in that the front part of the lower conveyor that forms the inlet part of the channel is concave and the upper part is convex. 3. The form of execution of the conveyor machine according to PP-1 and 2, for example, using for compulsory sealing of the joints-links of the molds during the channel of the mechanism consisting of gears coupled to the rails at the ends of the channel, of which the gears, located at the entrance end of the channel, receive rotation in the direction of movement of the conveyor, and gears, located at the output end of the channel, in the opposite direction. .- .. i1 JC / " ft Fig Fig a S