JPS6145968Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a holding/detaching device for a long nozzle of a ladle used in continuous casting.

Prior Art In continuous casting, when pouring molten metal in a ladle into a mold, a method is used in which the molten metal is first received in a tundish and then poured into the mold from the tundish, thereby controlling the amount of molten metal poured.

When the molten metal falls from this ladle to the mold,
May oxidize on contact with air.

Conventionally, a sand seal method was used to prevent oxidation between the ladle and the tundish. In this method, the area where the molten metal falls is completely surrounded by a seal box, and an inert gas such as argon is blown into the box to prevent the molten metal from coming into contact with oxygen.

In recent years, as the demand for oxidation-free casting has increased, long nozzles have come into widespread use. A long nozzle is attached to the ladle, and its tip is dipped into the molten metal in the tundish. This prevents contact between the molten metal and oxygen. This method also prevents slag from being entrained in the molten metal.

To attach the long nozzle to the ladle, (1)
There are three methods: (2) mounting on a ladle, (2) mounting on a seal box, and (3) manual adjustment.

The method of attaching it to a seal box has the following drawbacks. A large, expensive nozzle is required to match the movement of the ladle's slide valve.
Furthermore, since it is not possible to follow the movement of the ladle up and down, there is a risk that the molten metal will oxidize when the ladle goes up. On the other hand, in the manual adjustment installation method, a separate machine is used to replace the nozzle, but the nozzle position adjustment is
It is done manually.

On the other hand, with the method of fixing the long nozzle to the ladle, the position of the ladle must be raised extra high so that the long nozzle does not intersect with the tundish when replacing the ladle. Moreover, an expensive long nozzle must be prepared for each ladle.

For this reason, a device is used in which the long nozzle is detachably attached to the injection nozzle under the ladle. When a ladle is placed on a ladle car or swing tower (swivel ladle support device), misalignment inevitably occurs. Therefore,
When attaching and detaching the long nozzle, it is necessary to be able to easily adjust the position when attaching the long nozzle to the slide valve of the ladle. Also, when casting,
In particular, it is necessary that the long nozzle can smoothly follow the movement of the slide valve as the slide valve operates. FIG. 1 shows an example of a long nozzle holding device (Japanese Utility Model Application No. 56-29649). Here, the injection amount of the molten steel 2 in the ladle 1 is controlled by the nozzle opening/closing device 3, and it falls into the nozzle 4, and is passed through the long nozzle 5 attached to the nozzle 4 under a predetermined pressure.
The liquid is injected into the tundish 6 through the inside.

The long nozzle 5 is attached as follows. The long nozzle 5 is rotatably supported by a holder 7, and the arm 8 holds the holder 7 with a handle 9.
It is supported so that it can swing. The arm 8 passes through the support 10 and is supported by a plurality of rollers 12 provided in the frame 11 so as to be able to move forward and backward, and
The frame 11 is swingably supported around a pin 13. The support base 14 rotatably supports the column 10. The cylinder 15 is the frame 1 mentioned above.
5 and the support 10 are connected in an expandable and contractable manner.

When this long nozzle holding device is used, even when the ladle moves back and forth and left and right, the long nozzle 9
follows the movement of the nozzle 4 while remaining in close contact with the nozzle 4 at a predetermined pressure. Also, after the casting is finished,
When replacing the long nozzle, the cylinder 15 is operated to lower the long nozzle 7 and separate it from the nozzle 4. After transporting the ladle 1 and opening the upper part, the cylinder 15 is activated to raise it sufficiently as shown by the two-dot chain line in FIG.
0 and remove the long nozzle on the work deck.

When attaching and detaching the long nozzle, a very large vertical stroke is required from the standby position before casting to the long nozzle exchange device. The above-mentioned holding device uses a tilting mechanism that can obtain a large lifting stroke with a small cylinder stroke. However, this mechanism could not follow the linear elevation of the ladle because the locus of elevation of the position of the long nozzle was an arc. Also, Utsukai Showa 57-
No. 141850, Japanese Utility Model Application Publication No. 58-66066, and Japanese Patent Application Publication No. 57-159258 also disclose devices for attaching and detaching long nozzles and the like. Each of them has a different configuration and allows the long nozzle to move up and down, move forward and backward, turn, tilt, etc.
This makes it easy to attach and detach long nozzles, etc. Among these, Utility Model Application Publication No. 57-141850 uses a parallelogram link that can be freely moved forward, backward, left, and right, and furthermore, the arm that is attached horizontally to the arm constituting this link is kept in an extended and tight state. Therefore, it is possible to follow the movement of the sliding nozzle.

Purpose of the invention The purpose of the invention is to create a new arrangement that allows for easy position adjustment of the long nozzle and that can follow the movement of the ladle in any direction from the start to the end of casting, especially the operation of the slide valve. An object of the present invention is to provide a holding/detaching device for a long nozzle for a pot.

Structure of the invention Therefore, in the present invention, two cylinders are combined to adjust the position and follow the slide valve, and the lifting stroke necessary for nozzle replacement is obtained by the above-mentioned tilting mechanism. The basic feature of following the lifting and lowering of the machine is that it is supported by the lifting cylinder.

That is, the holding/detaching device for a long ladle nozzle according to the present invention includes a holder for holding the long nozzle, a rod having the holder at its tip, and a first arm for holding the rod slidably in the axial direction. a tilting device for holding the first arm and tilting the axis of the rod in a vertical plane parallel to the axis of the rod; A second arm section that is equipped with a rotation device that rotates the rod, a column to which this second arm section is attached horizontally, a cylinder that raises and lowers this column vertically, and a support that supports the column so that it can rotate in a horizontal plane. The first arm portion includes a first cylinder that extends and retracts the rod in the axial direction, and a second cylinder that is attached to the first cylinder so as to extend and retract in parallel to the rod. The second arm is provided with a stopper member so as to come into contact with the tip of the piston rod of the second cylinder in a contracted state.

Here, the arm section is provided with a tilting device that tilts the rod in a vertical plane parallel to the axis of the arm section, and also tilts the rod in a plane perpendicular to the axis of the arm section. Since a rotating device for rotating around the axis is provided, the stroke of the cylinder can be shortened during attachment and detachment, and the long nozzle can be moved through a narrow space.

Embodiments Examples of the present invention will be described with reference to the accompanying drawings.

FIG. 2 shows a state in which a long nozzle 23 is attached to a slide valve 22 of a ladle 21 using this embodiment. In addition, here, the long nozzle 23
is inserted into the container 24, and
The tundish tray 24 is covered with a cover 25.

This embodiment is installed on a base 31 on a tundish car lift frame. Therefore, the holding/detaching device according to this embodiment follows the movement of the tundish 24. A swing frame 33 is installed on a base 31 via a large-diameter ring-shaped bearing 32. Similarly, a hydraulic motor 34 is provided on the base 31, and by driving the hydraulic motor 34, the swing frame 33 can be rotated on the base 31 by a gear rack mechanism. As shown in Fig. 3, two guide bars (pillars) 35, 3
5 is attached to the rotating frame 33 via bearings 36, 36, . . . so as to be able to move up and down in the vertical direction. An arm 3 is attached to the upper end of the guide bars 35, 35.
Attach one end of 7 horizontally. A hydraulic cylinder 38 for lifting and lowering is installed vertically at the center of rotation of the rotating frame 33, and the upper end of a plunger 39 of this cylinder 38 is connected to one end of the arm 37. In this way, the arm 37 is connected to the lifting cylinder 3
8, the pair of guide bars 35, 35 can be guided to move up and down.
When rotated around , it is rotated in a horizontal plane.

The arm section is constructed as follows. That is, as shown in FIG. 5, a rotary actuator 41 is attached to the tip of the arm 37 horizontally and perpendicular to the longitudinal direction of the arm 37. At the tip of the rod of the rotary actuator 41, a cylinder 42 for fine position adjustment is installed perpendicularly to the rod.
Attach the outer cylinder part 43. The rotary actuator 41 is thus able to pivot the cylinder 42 in a vertical plane parallel to the axis of the arm 37.

Furthermore, as shown in FIGS. 2a and 2b, the rod 44 of the cylinder 42 is slidably held in the outer cylindrical portion 43 of the cylinder 42 via a sliding holder 45 and a bush 46. A nozzle holder 48 is attached to the tip of the rod 44 with a clasp 47 to support the long nozzle 23. On the other hand, the cylinder 42
At the other end opposite to the rotary actuator 4 for twisting, the cylinder 42 and therefore the rod 44 can be pivoted about its central axis.
Attach 9 via the slide coupling spring.
Further, a hydraulic cylinder 50 for a reference lock is attached to the outer cylinder portion 43 in parallel with the cylinder 42. Furthermore, a stopper member 49' is attached to the lower part of the rotary actuator 49, and the piston rod of the cylinder 50 is passed through the hole provided in this stopper member, so that the tip of the piston rod is inserted into the stopper member 49' when the cylinder 50 is contracted. , and serves as a reference (zero point) for adjusting the position of the cylinder 42. Note that the hydraulic cylinder 42 and rotary actuator 49 are connected to a water cooling jacket 51.
and a heat insulating cover 52 for heat resistance protection.

When adjusting the position of the long nozzle 23, the reference locking cylinder 50 is retracted and locked, and the fine adjustment cylinder 42 slides the rod 44 in the axial direction.
2 and the long nozzle 23 supported by the holder.

Next, during casting, the fine adjustment cylinder 42 is fixed and the reference lock cylinder 50 is kept in an extended state (position A in FIG. 2). When the rod 44 is subjected to some external force in the direction of expansion and contraction, the arm portion of this embodiment including the rod 44 moves to the fine adjustment cylinder 42.
The bush 46 slides within the stroke range of the reference lock cylinder 50. In this way, the long nozzle 23 can follow the movement of the slide valve 22 of the ladle 21 in the horizontal plane. On the other hand, as described above, since the lifting cylinder 38 is used to raise and lower the arm portion, the long nozzle 23 can also follow the vertical movement of the slide valve 22.

The attachment and detachment of the long nozzle to the ladle 21 will be explained using FIGS. 4 and 5. In FIG. 4, positions B and C indicate the lowered and raised positions of the ladle 21, respectively. On the other hand, position D is
The position of the arm 37 when the long nozzle 23 is attached to the ladle 21 is shown. Position E indicates the upper limit position of arm 37.

When waiting for casting, the long nozzle 23 in the exchange rack 61 is located at the nozzle exchange position F in FIG.
is held in the holder 48 and then moved onto the tundish 24. The arm part is lowered to the lowest position by the lifting cylinder 38. The reference locking cylinder 50 is locked in the contracted state. next,
Turn the ladle 21 and move it to position C.

The long nozzle 23 is positioned as follows. With the lifting cylinder 38, the long nozzle 23
is raised to just below the slide valve 22. The position is determined using the rotation motor 34 and the fine adjustment cylinder 42. After fixing the fine adjustment cylinder 42,
The lifting cylinder 38 is further raised and the upper end of the long nozzle 23 is pressed against the slide valve 22. Finally, the reference lock cylinder 50 is unlocked.

At the start of casting, the lifting cylinder 38 lifts the ladle 2
1, the ladle 21 descends to the casting position B. During casting, as explained above,
The rod 44 follows the movement of the slide valve 22 by sliding on a bush 46.

When casting is completed, the ladle 21 is raised to position C and then retracted.

The long nozzle 23 is replaced as follows. The arm portion is raised to the upper limit position E using the lifting cylinder 38. The rotary actuator 41 tilts the long nozzle 23 by about 30 degrees (position G) to prevent the long nozzle 23 from colliding with the deck 62 during the next turn. Next, with the swing motor 34,
Rotate the arm part to the nozzle replacement position F, and adjust the inclination of the long nozzle 23 using the rotary actuator 41.
Return it to its original state. The elevating cylinder 38 lowers the long nozzle 23, stores the long nozzle 23 in the exchange rack 61, and further lowers it to remove the long nozzle 23 from the holder 48.

Next, the replacement rack 61 is turned and the long nozzle 23 to be used next is placed in the replacement position. The arm part is raised by the lifting cylinder 38, and this new long nozzle is held in the holder and raised to the upper limit.
Next, in the same manner as in the above-mentioned removal, the long nozzle 23 is tilted by about 30 degrees, rotated, and moved to the top of the tundish 24 to restore the original inclination of the long nozzle 23. Next, the long nozzle 23 is attached to the slide valve using the same procedure as above.

The above is a case of retracting the ladle 21, but when replacing the long nozzle 23 while leaving the ladle 21 in the raised position C, the procedure is as follows.
The arm portion is raised to position H in FIG. 4 using the lifting cylinder 38. Next, using the rotary actuator 41 for twisting, the motor 38 for lifting and lowering, and the turning motor 34, as shown in FIG. from position H to position L by appropriately combining
The long nozzle 23 is placed in the space between the cover 25 and the ladle 21. Next, the rotation motor 34 moves to the nozzle exchange position F. The twisting rotary actuator 41 is used to restore the long nozzle 23 to its original inclination, and then the long nozzle 23 is replaced in the same manner as described above.

Effects of the invention The movement of the ladle in any direction can be followed, so
Oxidation-free casting is possible even if the ladle moves up and down during casting. Therefore, the quality and yield of slabs are improved.

Since it is sufficient to prepare the minimum number of long nozzles required, there is no need to prepare expensive nozzles for each ladle.

The long nozzle can be attached and detached without any human effort.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a conventional long nozzle holding device. Figures 2a and b are, respectively,
FIG. 2 is a front partial sectional view and a partially enlarged view of the embodiment. FIG. 3 is a partial sectional view taken along the - line in FIG. 2. FIG. 4 is a front partial sectional view showing the positions of the arm portion and the ladle. FIG. 5 is a plan view showing replacement of the long nozzle. Figure 6 shows
It is a figure which shows the method of pulling out the tundish cover of a long nozzle upward. 21...Ladle, 22...Slide valve, 23
...Long nozzle, 24...Tandate dish, 3
1...Base, 32...Bearing, 33...Swivel frame, 34...Motor, 35...Strut, 36...Bearing, 37...Arm, 38...Elevating cylinder,
41...Rotary actuator, 42...Cylinder, 44...Rod, 45...Sliding holder, 4
6... Bush, 48... Holder, 49... Rotary actuator, 50... Reference lock cylinder.

Claims (1)

[Scope of utility model registration request] A holder that holds a long nozzle, a rod that has this holder at its tip, a first arm that holds this rod slidably in the axial direction, and a holder that holds this first arm and that is attached to the axis of the rod. a second arm portion comprising a tilting device capable of tilting the axis of said rod in a vertical plane parallel to said rod and a rotating device configured to rotate said rod in a plane perpendicular to said rod axis; The above-mentioned first arm section is made up of a support column to which a second arm section is attached horizontally, a cylinder that raises and lowers the support column in the vertical direction, and a base that supports the above-mentioned support column so that it can pivot on a horizontal plane. comprising a first cylinder that expands and contracts the rod in the axial direction, and a second cylinder that is attached to the first cylinder so as to expand and contract in parallel to the rod, and
A holding/detaching device for a long nozzle for a ladle, characterized in that a stopper member is provided on the second arm portion so that the tip of the piston rod of the second cylinder comes into contact with the piston rod in a contracted state.