JPH0211970Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sleeve brick cutting device for a molten metal storage container, which cuts a sleeve brick for a porous plug attached to the bottom of a molten metal storage container such as a ladle. It is something.

[Prior Art] In recent years, with the increasing demand for ordinary steel and special steel, various ladle refining methods have been developed and put into practical use. These ladle refining methods include the VAC processing method (a method for manufacturing stainless steel at low cost by vacuum ladle refining) and LF.
There are processing methods (processing methods that deoxidize and desulfurize molten steel while electrically heating the molten steel in a ladle), but in these processing methods, as shown in Figure 6, in order to stir the molten steel 10, Attach the porous plug 13 to the bottom 12 of the ladle 11, and
Argon or nitrogen gas is blown into the molten steel through a pipe 14a connected to the molten steel for stirring. To install the porous plug 13, as shown in FIG. The above porous plug 13
The structure was such that they were joined and attached using mortar (also called Toro) 16 and 17.

However, as shown in FIG. 7, this porous plug 13 suffers from severe erosion and is replaced regularly.
3 is attached to the tuyere brick 14 via the sleeve brick 15, so the life of the tuyere brick 14 is longer than that of the porous plug 13 and the sleeve brick 15. Since the service life of the tuyere brick is short, the porous plug 13 and the sleeve brick 15 are removed from the tuyere brick 14 and replaced after a predetermined number of uses.

In this replacement work, it is necessary to replace the porous plug 13 and the sleeve brick 15 while they are red-hot (brick temperature 800°C or higher). However, due to the high temperature and thermal expansion accompanying the high temperature, the sleeve brick 15 Since it is baked into the brick 14 and firmly bonded, it cannot be easily removed by mere punching, and is carried out by highly skilled workers in the next work process.
The sleeve brick 15 has been removed.

That is, as shown in FIG. 8, after the ladle 11 is placed on the ladle tilting stand 18 and placed horizontally, the porous plug 13 is punched from the inside of the ladle 11 by a percussion punching machine 19. After punching, the baked sleeve brick 15 is removed to some extent with an air hammer (also called a neutral hammer) and a crowbar, and the remaining sleeve brick 15 is cut with a fusing lance and removed with a crowbar, and finally, The process was to wash off the tip again using a fusing lance and finish it off.

On the other hand, related inventions include:
There is a method for replacing a brick for blowing gas in a container for molten metal as described in Japanese Patent No. 119624.

[Problem that the invention attempts to solve]

However, in the above conventional example, when removing the baked sleeve brick, an air hammer,
Since crowbars and fusing lances are used, only highly skilled personnel can perform the work.Moreover, due to the standard work process time limit associated with the next process, hot repairs are required, resulting in a large number of repairs. There was a problem with the need for workers.

In addition, when replacing the sleeve brick in the above process, the brick is red hot, which causes the temperature in the workplace to rise to 50°C.
The temperature reached ~60°C, which caused problems in terms of safety and poor workability.

Furthermore, since the bricks were red hot, the chisel of the air hammer wore out quickly, and a large amount of fusing lances were used, making it impossible to reduce costs.

The method for replacing the brick for blowing gas in a container for molten metal described in the above-mentioned Japanese Patent Application Laid-Open No. 51-119624 relates to a method for attaching a porous plug, and the porous plug is attached by holding the porous plug with a metal object. The sleeve brick is removed after tapping the porous plug, but if the sleeve brick becomes stuck to the tuyere brick, it is removed by conventional means.

The present invention was developed in view of the above circumstances, and its purpose is to provide a sleeve brick cutting device for a molten metal storage container that can efficiently remove baked sleeve bricks in a short time without requiring a high degree of skill. do.

[Means to solve problems]

A sleeve brick cutting device for a molten metal storage container according to the present invention in accordance with the above object is provided with a center ring fixed to the axis of the sleeve brick attached to the bottom of the molten metal storage container and having an opening formed in the center. A mounting member that is freely removably attached to a member and has an opening formed in the center, a support member that is fixed to the mounting member, and a rotary impact machine with a blow function that is attached to the support member so that it can move forward and backward. , and a drill with a blowing hole which is detachably attached to the tip of the rotary impact machine with a blow function and whose cutting part has a substantially truncated conical shape to match the object to be processed.

Here, the above-mentioned blow-hole drill has a plurality of cutters having a trapezoidal cross section arranged according to the outer shape of the object to be processed, and the cutters arranged in the ridge direction are held in a dovetail shape, and the longitudinal section thereof is It is preferable to use a cutter holder having a trapezoidal surface and a drill body to which the cutter holder is fixed in a dovetail shape.

[Effect]

Next, the usage and operation of the molten metal storage container sleeve brick cutting device of the present invention will be described in detail.

First, a center ring fixing member having a predetermined opening formed in the center is attached in advance to the axis of a sleeve brick attached to the bottom of a molten metal storage container placed horizontally on a suitable tilt stand.

A mounting member having an opening formed in the center is attached to the center ring fixing member, a support member is attached to the mounting member, and a rotary impact machine with a blow function is attached to the support member so as to be movable back and forth. is attached, and a drill with a blow-off hole is attached to the tip of the drill, the cutting portion of which is shaped like a truncated cone to match the object to be processed. Therefore, the sleeve brick is cut by moving a drill with a blow hole set on the axis of the sleeve brick and applying rotation and vibration if necessary, but the drill with a blow hole is not the target of processing. Since its shape is molded to suit the object, the sleeve brick will be completely removed after the porous plug is taken out.

Once the center of rotation of the drill with a blowout hole is set to the axis of the sleeve brick, the center ring fixing member is attached to the axis of the sleeve brick, so the center of rotation of the drill with a blowout hole is set to the axis of the sleeve brick, so the center of rotation of the drill with the blowhole is always set to the center of the sleeve brick and the blowhole. The rotation center of the attached drill is aligned,
By rotating and moving back and forth the blowhole drill, the partially or completely baked sleeve brick is removed.

In this case, the drill for cutting the sleeve brick is equipped with a blow-off hole, and the rotary impact machine with a blow function is equipped with a blow mechanism, so that atomized cooling water can be sent through the blow-off hole. , the cutter, and the bricks are cooled and the cut brick waste is removed.

〔Example〕

Next, an embodiment embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.

Here, FIG. 1 is a side view showing the state of use of a sleeve brick cutting device for a molten metal storage container according to an embodiment of the present invention, and FIG. 2 is a side sectional view of a drill with an outlet hole used in the above embodiment. , FIG. 3 is a cross-sectional view taken along arrow A-A in FIG. 1, FIG. 4 is a cross-sectional view taken along arrow B-B in FIG. 2, and FIG. 5 is a sleeve brick cutting of the molten metal storage container according to the above embodiment. FIG. 3 is a side view of the device in use.

As shown in FIGS. 1 and 5, the sleeve brick cutting device 20 for a molten metal storage container includes a center ring fixing member 23 attached to the bottom 22 of a ladle 21, which is an example of a molten metal storage container, and An attachment member 24 is detachably attached to the center ring fixing member 23, a support member 25 is fixed to the attachment member 24, and a rotary impact machine with a blow function (commonly known as
26 (referred to as a drifter), and a drill 27 with a blowing hole attached to the tip of the rotary impact machine 26 with a blow function. These will be explained in detail below.

The center ring fixing member 23 includes a flange portion 28 having an opening in the center and a flange portion 28 having an opening at the center.
8, and teeth 30 (three teeth in the embodiment, but a larger number may be provided) provided at a predetermined interval at the tip of the short body portion 29. When the axial center position of the sleeve brick 31 on the bottom part 22 of the ladle 21 and the axial center position of the center ring fixing member 23 are aligned, the flange portion 28 is attached to the iron skin constituting the outer surface of the ladle 21. 32
It is welded and fixed to the

The mounting member 24 that is detachably engaged with the center ring fixing member 23 includes a ring-shaped clamper 34 having teeth 33 that mesh with the teeth 30 of the center ring fixing member 23 and a screw clamp guide 35. It becomes. The teeth 33 are formed at predetermined intervals and have a structure in which the teeth 30 of the center ring fixing member 23 fit into them at a predetermined angle, and the contact surfaces of the teeth 30 and the teeth 33 are in contact with each other. A matching spiral taper is formed, and as the ring-shaped clamper 34 rotates, the screw-type clamp guide 35 is attached to the center ring fixing member 2.
It is designed to be attached to the end face of 3 in a pressed state.

In this case, it is assumed that the screw type clamp guide 35 that is screwed into the ring-shaped clamper 34 is screwed to a predetermined position. Further, the ring-shaped clamper 34 is configured to be rotated by a predetermined angle by a telescoping cylinder (or motor) not shown.

This screw type clamp guide 35 is attached to the support member 2.
5 is fixed to the support member 25, two guides 36 are attached to the support member 25, and a rotary impact machine 26 with a blowing function attached to a slide base 37 is mounted on the guides 36.

The slide base 37 is tensioned forward and backward by sprockets 37 and 38, and a chain 40 that meshes with a drive sprocket 38a is attached to the lower part of the slide base 37, and the sprocket 38a is rotated by the rotation of a drive motor (not shown). The chain 40 moves back and forth, and the rotary impact machine 26 with a blow function mounted on the slide base 37 moves forward and backward.

This rotary impact machine 26 with a blow function has a well-known structure, and has a water pipe 39 and an air pipe 39a at the rear.
The chuck part 41 at the front part is connected to a drive motor to rotationally drive the chucked drill 27 with an outlet hole.

In addition, stoppers 42a and 43a are provided at the front and rear ends of the guide 36 to prevent the rotary impact machine 26 with a blow function from moving beyond a certain distance.

The drill 27 with a blow hole attached to the chuck portion 41 of the rotary impact machine 26 with a blow function will be explained with reference to FIGS. 2 and 4. The drill 27 with a blow hole is hollow inside. The drill body 42 includes a drill body 42, a mounting lid 47 attached to the rear end of the drill body 42, and a cap 51 attached to the tip. A plurality of cutters 44 are attached.

The drill body 42 has a truncated cone shape that is slightly smaller in outer shape than the sleeve brick 31 that is the object to be processed, and has a plurality of dovetail grooves 45 having a trapezoidal cross section in the ridge direction.
(Partially shown in FIG. 4) is formed up to the front end, and each dovetail groove 45 has a cutter holder 43 having a trapezoidal cross section.
is fitted into the drill body 42 so as not to come off from the surface thereof, and an attachment cover 47 is attached to the rear end of the drill body 42 by screwing.

As shown in FIG. 2, the cutter holder 43 is formed with a dovetail groove 48 having a trapezoidal cross section in the lateral direction.
A cutter 44 made of WC material (ceramic material may also be used) also having a trapezoidal longitudinal section is fitted and fixed.

On the other hand, a plurality of screw holes of a predetermined size are formed in the drill body 42, and a spool nozzle 49 is attached to the screw holes to form a blowing hole 50. Water is supplied from the blow-off hole 50 from the water pipe 39 and air pipe 39a attached to the rear of the rotary impact machine 26 with a blow function, and water containing water is atomized by a mixer disposed inside. It's designed to blow out air.

A cap 51 is attached to the tip of the drill body 42, and the cap 51 is provided with cutters 52 and 53 which are similarly engaged with grooves having a trapezoidal cross section, and a blowout hole 54 is formed in the center of the cutters 52 and 53. There is. A pendant switch 56 connected by a flex cable 55 is connected to the rear of the support member 25, so that the sleeve brick cutting device 20 of the molten metal storage container can be controlled from the rear of the support member 25. ing.

Next, the usage method and operation of the sleeve brick cutting device 20 for a molten metal storage container according to the above embodiment will be explained in more detail.

First, as shown in FIG.
is transported to the ladle repair pit 58 by an overhead crane (not shown), and then installed and fixed in the horizontal direction by the tilting stand 18.

Next, the porous plug 57 and the sleeve brick 31 are punched out from the inside of the ladle 21 by the conventional percussion punching machine 19, but the sleeve brick 31 and the tuyere brick 59 are thermally expanded and seize together. Only the porous plug 57 remains without being punched out and is removed.

Next, the sleeve brick cutting device 20 of the molten metal storage container according to the above embodiment is transported to the bottom 22 of the ladle 21 by an overhead crane, and as shown in FIG. After approximately aligning the axial center of the plug with the drill 27 with a blowing hole attached to the sleeve brick cutting device 20 of the molten metal storage container, the teeth 30 of the center ring fixing member 23 are fitted into the mounting member 24. let

It is assumed here that the center ring fixing member 23 is fixed to the bottom of the ladle 21 by welding.

Next, the ring-shaped clamper 34 is rotated by a cylinder (not shown) so that the teeth 30 and the teeth 33 of the ring-shaped clamper 34 are brought into contact with each other, and the sleeve brick cutting device 20 of the molten metal storage container is ladleed. 21 is fixed at a predetermined position on the bottom of the drill 21, and centering of the drill 27 with the blowing hole is performed.

At this point, the water piping 39 and the air piping 39a are installed, the heat shield plate 60 is placed in a predetermined position, and work preparation is completed.

Next, by operating the pendant switch 56, the rotary impact machine 26 with a blow function is advanced to a predetermined position, and then the drill 27 with a blowing hole is moved forward.
Rotate. In this case, the cutter 4 is
4,52,53 Make sure that water-containing air for cooling is blown out. Another reason why the water-containing air is blown out from the drill with the blow hole is that it cools the bricks to be cut, lowers the heat of cutting, and blows the cut bricks forward. The point is that the cutting is performed on the

The cutters 44, 52, 53 are arranged according to the outer shape of the sleeve brick 31, so that the rotary impact machine 26 with a blow function moves a predetermined distance until it comes into contact with the stopper 42a. Sleeve brick 3 attached to mouth brick 59
1 will be completely removed. Incidentally, if necessary, it is also possible to remove the adhered sleeve brick 31 by appropriately vibrating the blow-hole drill 27.

This completes the work, so the rotary impact machine with blow function 26 is moved backwards, and the mounting member 2
4, the sleeve brick cutting device 20 of the molten metal storage container is removed from the ladle 21.

Next, when used a suitable number of times, the cutters 44, 52, and 53, which are the teeth of the blow-hole drill 27, will wear out, but in order to replace them, the drill body 4
This is done by removing the cap 51 from the cutter holder 2, pulling out the cutter holder 43 inserted in the ridge direction toward the front end, and pulling out the cutter 44 from the cutter holder 43 in the lateral direction.

Since the cutter 44 is attached in this way, the cutter 44 can be replaced extremely easily.
It becomes extremely easy to attach and detach the cutter (also called a chip), which was conventionally attached by screwing or brazing.

[Effect of idea]

As is clear from the above description, the sleeve brick cutting device for a molten metal storage container according to the present invention is capable of cutting sleeve bricks baked into the bottom of a molten metal storage container without requiring a high level of skill. It became possible to remove it in a short time.

Furthermore, since the operator can operate the device from the rear, safety and workability are significantly improved.

Therefore, the sleeve brick cutting device for molten metal storage containers according to the present invention can contribute to improving productivity and workability at reduced costs in response to the recent increase in demand for special steel such as VAC treatment. There was nothing I could do.

[Brief explanation of the drawing]

Fig. 1 is a side view showing how a sleeve brick cutting device for a molten metal storage container according to an embodiment of the present invention is used; Fig. 2 is a side sectional view of a drill with an outlet hole used in the above embodiment; The figure is a sectional view taken along the line A-A in FIG. 1, FIG. 4 is a sectional view taken along the line B-B in FIG. 2, and FIG. 5 is a sectional view taken along the line B-B in FIG. Fig. 6 is a side sectional view showing the operating state of the ladle refining method according to the conventional example, and Fig. 7 is a side sectional view showing the installation and melting state of the sleeve brick according to the conventional example. , and FIG. 8 is a side sectional view showing a state in which a sleeve brick according to a conventional example is removed. Explanation of symbols, 20... Sleeve brick cutting device for molten metal storage container, 21... Ladle, 22... Bottom, 23... Center ring fixing member, 24...
Mounting member, 25...Supporting member, 26...Rotary impact machine with blow function, 27...Drill with blowout hole, 31...Sleeve brick, 39...Water piping,
40...Air piping, 43...Cutter holder,
44, 52, 53... cutter, 45, 48...
Dovetail groove, 50, 54...Blowout hole, 57...Porous plug.

Claims (1)

[Claims for Utility Model Registration] (1) A sleeve attached to the bottom of a molten metal storage container, which is fixed to the axis of a brick, and which is freely removably attached to a center ring fixing member with an opening formed in the center. A mounting member having an opening formed in the mounting member, a support member fixed to the mounting member, a rotary impact machine with a blow function mounted on the support member so as to be movable in a forward and backward manner, and a rotary impact machine with a blow function. 1. A sleeve brick cutting device for a molten metal storage container, comprising: a drill with a blow-off hole which is detachably attached to the tip of the drill and whose cutting part has a substantially truncated conical shape to match the object to be processed. (2) A drill with a blow-off hole has a plurality of cutters with a trapezoidal cross section arranged according to the external shape of the object to be processed, and the cutters arranged in the direction of the ridge line are held in a dovetail shape, and the longitudinal section of the cutter is Sleeve brick cutting for a molten metal storage container according to claim 1, which has a cutter holder having a trapezoidal shape and a drill body that fixes the cutter holder in a dovetail shape. Device.