JPS5917348B2 - Furnace repair device with pipe scraping function - Google Patents

Description

[Detailed description of the invention] This invention provides a RH furnace, a DH furnace, a ladle, a tundish,
Related to hot repair equipment for gutters, converter mixers, etc.

In particular, repair work for RH furnaces, DH furnaces, and reactor reactors that have traditionally been carried out cannot be performed by remote control, and therefore requires manual intervention. In this case, high-temperature materials from inside the furnace tend to fall into the work area.
5 It was extremely dangerous.

In order to overcome these drawbacks, several automated repair devices have been developed in recent years, and one form of these is the DH furnace,
A lance for spraying refractory material is brought to the bottom of a reactor such as an RH furnace in a rotary and movable state, and the nozzle at the tip of the lance is remotely controlled under the same reactor to repair areas. After that, there is a method in which unset refractory material is sprayed from the same nozzle onto the damaged parts of the furnace inner wall or the damaged parts of the furnace outer wall.

5. However, conventional repair equipment does not give sufficient consideration to protecting the spray pipe and the pipe drive mechanism that rotates or raises and lowers the spray pipe from slag spray material falling from the reactor, and in this respect, I had this problem.

υ Also, during repair work, molten metal, slag, etc. adhered to the spray pipe, which prevented the pipe from moving up and down smoothly.

The present invention was created in consideration of the current situation, and its purpose is to reliably protect the spray pipe, pipe i5, and drive mechanism from falling objects, and to effectively remove deposits on the surface of the spray pipe. It is an object of the present invention to provide a furnace repair device that can remove and perform spraying work smoothly and safely.

The present invention is a repair device equipped with a vertical spray pipe υ that can be raised and lowered toward a furnace, and in which the vertical spray pipe can be freely inserted into an outer cylindrical body, and the top of the outer cylindrical body is directed upward. It has a conical shape with a decreasing diameter, and a falling object sliding surface is formed on the peripheral surface, and the shape of the upper end opening of the conical top is approximately the same as the cross-sectional shape of the spray pipe, and the shape is relative to the i5 same opening. This invention relates to a furnace repair device having a function of scraping off deposits on a pipe, characterized in that the spray pipe is slidable and deposits on the surface of the spray pipe are scraped off at the periphery of the opening.

Hereinafter, the repair device according to the present invention will be explained in detail with reference to embodiments shown in FIGS. 1 to 4.

FIG. 1 shows the installed state of the repair device according to the present invention. In the figure, 1 is an RH reactor supported movably on an upper frame 2, and the reactor has a suction pipe 3 and a drain pipe 4 protruding from the bottom, extending downward and having an opening at the lower end. ing.

A lower pedestal 5 (which may be movable) is further provided below the RH reactor, and on the lower pedestal is a molten metal receiving container 6 (indicated by a dotted line) used for degassing work. is brought by a moving carriage 7 (indicated by a dotted line). After degassing, the molten metal receiving container 6 is moved from the dotted line position, and in place of it, the repair device 8 according to the present invention is brought along the rail 9 directly below the RH reactor 1 to the position shown by the solid line in FIG. Take. Regarding other things in FIG. 1, 11 is a monitoring window provided at the top of the RH reactor 1, 12 is a monitoring worker, and 13 is a remote control device 14, 1.
5 shows an operator who operates the repair device 8.

2 and 3 show the detailed structure of the repair device 8 according to the present invention.

In the figure, reference numeral 16 indicates a hollow vertical spray pipe equipped with a removable spray nozzle 17 at the upper end.
It is attached to a traveling carriage 18, which can freely run on the top thereof, through a space 19 so that it can be inserted therethrough.

Further, the blowing pipe 16 can be moved up and down (advance and retreat) with respect to the RH reactor 1 by a delivery mechanism 20 to be described later, and further can be rotated about an axis by a rotation mechanism 21. The traveling carriage 18 is equipped with a drive motor 22, and can run on the rail 9 in any direction when the drive motor is operated.

The delivery mechanism 20 is mounted on the traveling carriage 18, and substantially surrounds the spray pipe 16 concentrically, and further includes an outer cylindrical body 23 that supports the spray pipe in a manner that allows it to move up and down but not rotate.
Two pairs of upper and lower feed rollers 24 and 25 are rotatably attached to the upper and lower ends of the outer cylinder, respectively, and are fixed to the lower outer wall of the outer cylinder 23, and the output shaft is connected to the lower feed roller. It consists of a feeding drive motor 36 which is rotatably connected to 25.

27 is a thrust bearing that rotatably supports the outer cylindrical body 23 on the traveling carriage 18.

Note that the upper delivery roller 24 can also be attached to the spray pipe 16. In the above configuration, preferably the blowing pipe 16 has a non-circular cross section or a cross section with at least a portion of a straight line (for example, a rectangular shape), and the feeding roller 24
, 25 are also straight, and the feed roller is pressed against the spray pipe 16 to make flat surface contact.

Further, the outer cylinder body 23 has a conical top portion 28 whose diameter decreases upward, and thereby forms a falling object sliding surface on the circumferential surface, and allows the feeding mechanism 20 and the rotation mechanism 21 to be moved from the falling object. can be protected. Further, the upper end opening of the conical top has substantially the same cross-sectional shape as the spray pipe 16, so that the slag spray material and the like adhering to the spray pipe 16 can be scraped off as the spray pipe 16 moves up and down. The rotation mechanism 21 is also mounted on the traveling carriage 18, and substantially the outer cylindrical body 23
A cylindrical support frame 29 that concentrically surrounds and rotatably supports the middle part of the frame 29, a worm wheel 30 that is fixed to the outer periphery of the lower part of the outer cylinder 23, and a worm that meshes with the worm wheel. It consists of a shaft 31 and a rotation drive motor 32 mounted on the traveling carriage 18 to rotate the worm shaft.

In the figure, reference numerals 33 and 34 are a refractory supply hose and a spray auxiliary material (water) supply hose that are rotatably connected to the spray pipe 16 via a flexible connecting fitting 35.

Next, the operation of the repair device according to the present invention will be described.

First, after the degassing operation is completed, the molten metal receiving container 6 is removed from the dotted line position, and the lower frame 5 or the traveling trolley 18 is run on the rails 9 to bring it directly below the RH reactor 1.

Thereafter, the feeding mechanism 20 is driven to raise the spray pipe 16 with the feeding rollers 24 and 25 in a press-contact state, and the spray nozzle 1 is raised.
7 into the RH reactor 1. Next, the rotating mechanism 21 is driven to integrally rotate the outer cylinder 23, the delivery rollers 24, 25, and the blowing pipe 16 around the axis of the blowing pipe, and the blowing end of the blowing nozzle 17 is connected to the RH reactor 1. The refractory supply hose 33 and spraying auxiliary material (water) are placed opposite the wall surface to be constructed, and then from other equipment necessary for the repair work such as a refractory tank and compressor etc. placed in separate locations (not shown). For example, the refractory and water are supplied into the spray pipe 16 via the supply hose 34, and the spray pipe 16
The sprayed refractory that has become a slurry inside can be sprayed from the spray nozzle 17 onto the wall surface to be constructed. The above repair work is performed using the remote control device 14, 1.
5, this can be done safely and reliably. Furthermore, in the repair device according to the present invention, the blowing pipe 16 is connected to the fourth
As shown in the figure, it is also possible to adopt a structure consisting of a lower blowing pipe 16a that is rotatable about its axis and an upper blowing pipe 16b that is eccentric from the same axis.

By doing this, for example, in the repair work outside the reactor 1, the axis of the lower blow pipe 16b can be aligned with the DH furnace 4.
The axis is the same as the axis of the suction pipe 41 of 0, and then the rotation mechanism 2
1, the upper blowing pipe 16b and the blowing nozzle 17 can rotate around the suction pipe 41 at a constant distance from the outer periphery thereof.

As described above, the repair device according to the present invention has the following effects.

(1) The outer cylindrical body that surrounds the spray pipe so that it can be inserted freely has a conical top whose diameter decreases upward, so that the rotating mechanism, feeding mechanism, etc. of the spray pipe can be protected from falling objects from the reactor. 1 drive mechanism can be effectively protected.

Further, the diameter-reduced upper end opening prevents slag spray material, metal, etc. from adhering to the spray pipe. (2) Conventional spray pipes with a circular cross section require a drum-shaped delivery roller, which results in different circumferential speeds at the contact surface, greater wear and tear on the spray pipe and delivery roller, and the risk of slipping. Since the spray pipe according to the invention has a non-circular cross section and the pressure contact surface is a flat surface, the above-mentioned problem does not occur.

(3) When rotating the conventional blow pipe and feed roller having the above-mentioned circular cross section or drum shape around the blow pipe axis, the relative rotation angle between the blow pipe and the feed roller becomes misaligned, and the blow nozzle rotates. Although there is a possibility that the movement angle and the rotation angle of the rotation mechanism may be different, since the spray pipe according to the present invention has a non-circular cross section and is in flat surface contact with the feeding roller, the above-mentioned problems will not occur and this will be ensured. It is possible to perform integral rotation.

(4) Even with the conventional spray pipe and delivery roller in (3), the same effect as the spray pipe according to the present invention can be achieved by providing keys and keyways therein, but on the other hand, the spray pipe This causes stress concentration in the notches, etc., and the strength of the pipe is significantly reduced.

However, in the spray pipe according to the present invention, such stress concentration does not occur. (5) Since there is no need to provide a key or a keyway, the structure of the rotation mechanism and the feeding mechanism can be simplified, which is advantageous in terms of production costs and maintenance.

(6) With respect to the spray pipe that rotates around the axis, at least the spray nozzle is eccentric from the rotation axis and the blowing direction is directed inward, so that spraying work on the outer circumferential surface of, for example, a suction pipe can be performed. This can be done uniformly and effectively simply by rotating the spray pipe around its axis. (7)
Since the vertical blowout pipe is arranged so as to be able to pass through the lower frame or running carriage on which the pipe drive mechanism is mounted, 1) the blowing pipe can have a large payout stroke, and 2) it can also be attached to the lower frame or running carriage. Since there is no need to raise and lower the pipe drive mechanism integrally, the mechanism can be made small and simple, and 3) there is no need to make the overall length of the spray pipe longer than necessary.

(8) In the present invention, the spray pipe structure has a double pipe structure in which the spray pipe is an inner pipe and the outer cylinder is an outer pipe, and both pipes are further provided with the above-mentioned feeding roller. With the above configuration, the inner and outer pipes can smoothly slide relative to each other and rotate integrally, so that wear of the pipes can be prevented as much as possible, and the operation of the pipes can be ensured. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a layout diagram of a repair device according to the present invention, Fig. 2 is a partially cutaway front view of the same device, Fig. 3 is a partially cutaway perspective view of the same device, and Fig. 4 is a spraying of another embodiment. FIG. 3 is a layout diagram of the repair device including a pipe. 1: RH reactor, 2: upper frame, 3: suction pipe, 4: discharge pipe, 5: lower frame, 6: molten metal receiving container, 7: moving trolley,
8: Repair equipment, 9: Rail, 11: Monitoring window, 12: Monitoring worker, 13: Operating worker, 14: Remote control device, 15: Remote control device, 16: Vertical spray pipe, 17: Spray nozzle , 18: Traveling trolley, 19:
Blank space, 20: Feeding mechanism, 21: Rotating mechanism, 22: Drive motor, 23: Outer cylinder, 24: Upper feeding roller, 25: Lower feeding roller, 26: Feeding drive motor, 27: Thrust bearing, 28 : conical scraper, 29: cylindrical support frame, 30: annular worm wheel, 31: worm shaft, 32: rotation drive motor, 41: suction pipe.

Claims (1)

[Claims] 1 A repair device equipped with a vertical spray pipe that can be raised and lowered toward the furnace, the vertical spray pipe being able to be freely inserted into an outer cylinder, and having a conical shape whose diameter decreases upward with the top of the outer cylinder. A falling object sliding surface is formed on the peripheral surface, and the shape of the upper end opening of the conical top is approximately the same as the cross-sectional shape of the spray pipe, so that the spray pipe can slide freely relative to the opening. A furnace repair device having a function of scraping off deposits on a pipe, characterized in that deposits on the surface of the spray pipe are scraped off at the periphery of the opening.