JP2808142B2 - Preheating dryer for RH furnace - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for preheating and drying an RH furnace used for vacuum degassing.

[Prior art] The RH furnace is mainly composed of a small tank, such as an upper tank, an intermediate tank, and a lower tank, and an immersion pipe. The immersion pipe is a well-known suction pipe and discharge pipe for molten metal. Function as
Because it is immersed in the molten metal, slag adheres or melts,
Early repair and replacement were required.

Also, at the start of the degassing operation, the inside was preheated with a burner to reduce the thermal shock from the molten metal.

[Problems to be solved by the invention]

However, since sufficient preheating was not performed on the outer surface of the immersion tube, cracks were generated due to thermal shock, and refractory materials were severely worn, so that there was a problem that the life was short.

The present invention has been made in view of such circumstances, and provides a RH furnace preheating drying device that can perform not only preheating inside an RH furnace including a dip tube, but also preheat the outside of a dip tube. With the goal.

[Means for solving the problem]

The preheating dryer of the RH furnace according to the present invention according to the above object,
(1) A burner hood whose upper end is in contact with a mounting flange of a pair of immersion pipes which is moved up and down by a driving device and which is mounted on an RH furnace, and which is disposed at an intermediate portion of the burner hood and which is provided outside of the immersion pipe by a swirling flow. And an internal heating burner arranged to be able to move up and down inside the pair of immersion pipes, and to dry and preheat the immersion pipe and the lower tank, the intermediate tank, and the upper tank to which the immersion pipe is attached. And

[Action]

The preheating dryer of the RH furnace according to the present invention has a burner hood whose upper end abuts on the mounting flange of the immersion tube, so that the entire immersion tube can be surrounded, and an intermediate portion of the burner hood is provided. Since the external heating burner is attached, the drying process can be performed when the dip tube is repaired, and the external preheating of the dip tube can be performed when the degassing process is performed.

In addition, since an internal heating burner that can move up and down is provided at the center of each immersion tube, the immersion tube, the lower tank, the intermediate tank, and the upper tank can be dried and preheated.

〔Example〕

Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

Here, FIG. 1 is an overall plan view of a repair cart of the repair equipment of the RH furnace, FIG. 2 is a side view thereof, and FIG. 3 is a front sectional view of a preheating drying device of the RH furnace mounted on the repair cart. 4 is the same side sectional view, FIG. 5 is the sectional view taken along the line AA in FIG. 3, and FIG.
The figure is a sectional view taken along the line BB in FIG.

According to one embodiment of the present invention as shown in FIGS.
The repair truck 11 equipped with the RH furnace preheating drying device 10 is mounted so as to be able to run on the same rail 12 as a ladle truck used for normal work, and a cable winding for supplying power and the like is provided on a side portion. A winding machine 13 and a hose winding machine 14 for winding an air hose and a water hose are provided.

In addition to the preheating drying device 10, the repairing trolley 11 has a lower surface slag cutter 15 and an outer peripheral slag cutter 16 of a dip tube constituting a slag cutter device, and a television camera device 17 for observing the state of erosion inside the RH furnace. And the television camera device 17
An external spraying device 18 constituting a spraying device mounted on the same truck as an internal spraying device 19 constituting a spraying device
And a material supply device 20 for supplying a spray material to these,
The immersion tube includes a press-fitting device 21 for press-fitting a refractory into the inside of the immersion tube, and an opening / closing slide deck 59 for packing work.

The lower surface slag cutter 15 attached to the repairing trolley 11 includes a frame 23 on which guides are arranged before and after the blades 22 are arranged at the upper end, and electric cylinders 24, 25 on both sides for raising and lowering the frame 23. The repair trolley 11 is reciprocated back and forth by aligning the blade 22 arranged at the upper end of the frame 23 with the vicinity of the lower ends of the immersion pipes 26 and 27 of the RH furnace. The slag attached to the lower ends of the tubes 26 and 27 is removed.

The outer peripheral slag cutter 16 is provided with means for expanding and contracting the opposed blades 28 and 29 which are arranged in parallel with a radius of curvature substantially the same as the outer diameter of the dip tubes 26 and 27, and means for expanding and contracting the blades 28 and 29. A device that rotates together with the device,
Stop the repair trolley 11 so that it is located exactly at the center of the immersion pipe 26 (similarly for 27). First, raise the whole to a predetermined height, and then determine the distance between the blades 28 and 29 according to the diameter of the immersion pipe 26. The blades 28 and 29 are rotated and moved up and down in contact with the immersion tube 26 to drop slag adhered to the periphery of the immersion tube 26.

On the other hand, the television camera device 17 is mounted on a trolley 30 perpendicular to the traveling direction of the rail 12, and an external spraying device 18 is arranged on the trolley 30 in addition to the television camera device 17.

The inside of the RH furnace 31 can be observed by the television camera device 17, and the outer surface spraying device 18 can repair the outer surfaces of the immersion tubes 26 and 27.

An inner spraying device 19 is provided at the center of the repair cart 11.
However, the inner surface spraying device 19 is attached to the tip of a spray pipe 32 which can be moved up and down and swivelable by a motor drive source (not shown) to damage the inner surfaces of the immersion pipes 26 and 27 with the repair material blown out from the tip. It can be sprayed on the place.

The material supply device 20 attached to the external spraying device 18 and the internal spraying device 19 constituting the above-described spraying device has a butterfly valve provided at an upper portion, a repair material stored therein, and a material cutting device at a lower portion. It has a well-known structure having a tank provided, in which the repair material is transported by compressed air, water is mixed on the way, and supplied to the spray nozzle at the upper end.

A press-fitting device 21 is provided at an end of the repairing trolley 11. The press-fitting device 21 includes a cylindrical body inserted into immersion pipes 26 and 27, an elevating platform that moves the cylindrical body up and down, A material supply pipe disposed inside the body and having a discharge port coinciding with the outer surface of the cylindrical body, and having an axial center aligned with a lower part of one of the immersion pipes 26 and 27 to be repaired. After arranging the cylinder, the cylinder is raised and the lower flange of the cylinder is immersed in the pipe 26,
After being brought into contact with the lower end of 27, the repair material is poured into the material supply pipe by a hose (not shown), and discharged from the distal end to the outside of the cylindrical body to perform filling and repair at a damaged portion. Opening / closing slide decks 59 for patching work are provided on both sides of the press-fitting device 21 so that local damage to the immersion tubes 26 and 27 can be repaired by putty work.

On the other hand, in order to dry the repair material supplied by the outer spraying device 18, the inner spraying device 19 or the press-fitting device 21, and to preheat the RH furnace, a preheating drying device 10 is attached to the repairing cart 11. It is attached, and this is shown in Fig.3 ~
This will be described in detail with reference to FIG.

The preheating drying device 10 includes an upper burner hood 33, a mounting base 34 for the burner hood 33, an electric cylinder 35 that constitutes a central elevating unit, and internal heating units disposed in left and right holes of the burner hood 33, respectively. Burners 37, 36,
The internal heating burners 37, 36 have lifting means 38, 39, and an external heating burner 40 provided at an intermediate portion of the burner hood 33.

The burner hood 33 is provided with a space portion 41 having a bicircular cross section as shown in FIG. 5 in which the dip tubes 26 and 27 are completely fitted, and when the burner hood 33 is fitted, the dip tubes 26 and 27 are attached. The flanges 42 and 43 come into contact with the upper end of the burner hood 33.

The external heating burner 40 is composed of a normal oil burner, and blows out combustion gas to an intermediate portion of the immersion tubes 26 and 27,
The outside of the immersion tubes 26 and 27 is heated by the swirling flow.

And the mounting base 34 of the burner hood 33 to which the external heating burner is mounted is, as shown in FIG.
It is vertically movably mounted via guides 45 to 48 mounted on a fixed frame 44 around it, and an electric cylinder 35 as a driving device is mounted at the center as shown in FIGS. 3 and 6. The burner hood 33 can be moved up and down.

The lower part of the burner hood 33 has two cylinders 49,
Internal heating burners 37, 36 are disposed separately from each other, and the internal heating burners 36 (similarly, 37) are attached to a lifting carriage 52 supporting a support member 51, as shown in FIG. The lift truck 52 is attached to a chain stretched over upper and lower sprockets 53, 54, and is driven by a deceleration motor 55 (56) that rotationally drives the upper sprocket 53.
52 goes up and down. The sprocket 53,
The motor 54 and the deceleration motors 55 and 56 are mounted on the mounting base 34 inside as shown in FIG.

The mounting base 34 is moved up and down by the electric cylinder 35 so that the upper end of the burner hood 33 comes into contact with the mounting flanges 42 and 43 of the immersion pipes 26 and 27. In this case, the combustion air supplied to a blower (not shown) is supplied. Air pipe 57
Is provided with a telescopic tube 58, which is connected by extending the telescopic tube 58 so that primary air can be supplied to the internal heating burners 36 and 37, respectively.

Each of the internal heating burners 36 and 37 includes an LPG burner for pilot and a heavy oil burner for internal heating, and heats the inside of the immersion tube and the inside of the RH furnace.

Therefore, when using the preheating drying apparatus 10, the repair carriage 11 is driven to align the axes of the immersion pipes 26 and 27 with the axes of the burner hoods 33, and then the electric cylinder 35 is actuated to mount. The gantry 34 is raised so that the tip of the burner hood 33 comes into contact with the mounting flanges 42, 43 of the dip tubes 26, 27.

In this state, the external heating of the immersion tubes 26 and 27 is performed by igniting the external heating burners 40, and the internal heating burners 36 and 37 are raised and lowered to predetermined positions and ignited to ignite the interior of the immersion tubes 26 and 27. And, preheating drying of the inside of the RH furnace 31 is performed.

Also, by keeping the tip of the burner hood 33 in contact with the mounting flanges 42, 43 of the immersion tubes 26, 27,
Heat shielding from the heated immersion tubes 26, 27 can be performed.

〔The invention's effect〕

As is clear from the above description, the repair equipment for the RH furnace according to the present invention repaired a dip tube, a lower tank, and an intermediate tank generated when performing degassing of molten metal using the RH furnace. In some cases, the repair material can be dried internally and externally.

In addition, before the degassing process, not only the inside of the immersion tube but also the outside is efficiently preheated, so that thermal shock can be reduced and a long life can be given to the immersion tube.

Also, by contacting the upper end of the burner hood with the mounting flange of the immersion tube, heat from the immersion tube heated by the RH treatment can be shielded, so that work near the immersion tube can be performed safely. It was decided.

[Brief description of the drawings]

FIG. 1 is an overall plan view of a repair trolley of the repair equipment of the RH furnace, and FIG.
FIG. 3 is a front sectional view of the same, FIG. 3 is a front sectional view of a RH furnace preheating drying device mounted on a repairing car, FIG.
The figure is a sectional view taken along the line AA in FIG. 3, and FIG. 6 is a sectional view taken along the line BB in FIG. [Explanation of reference numerals] 10: Preheating dryer, 11: Repairing trolley, 12: Rail, 13
…… Cable winding machine, 14 …… Hose winding machine, 15 ……
Bottom slag cutter, 16 ... Peripheral slag cutter, 17 ...
... TV camera device, 18 ... Outside spraying device, 19 ... Inner spraying device, 20 ... Material supply device, 21 ... Press-in device,
22 ... blade, 23 ... frame, 24, 25 ... electric cylinder, 2
6, 27 ... dip tube, 28, 29 ... blade, 30 ... trolley, 31 ... R
H furnace, 32 ... Blowing pipe, 33 ... Burner hood, 34
…… Mounting stand, 35 …… Electric cylinder, 36, 37 …… Internal heating burner, 38, 39 …… Elevating means, 40 …… External heating burner, 41 …… Space, 42, 43 …… Mounting flange,
44 …… Fixed stand, 45-48 …… Guide, 49, 50 …… Cylinder,
51 ... Supporting member, 52 ... Lifting truck, 53, 54 ... Sprocket, 55, 56 ... Deceleration motor, 57 ... Air pipe,
58 …… Telescopic tube, 59 …… Slide deck

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yoshinori Tsuruhara 111-1 Showa-cho, Kure City, Hiroshima Prefecture Inside Nisshin Steel Co., Ltd.Kure Works of Shikai Kaisha (72) Inventor Shigeo Kawamoto 11-1 Showa-cho, Kure City, Hiroshima Prefecture Kawamoto Construction Furnace Industry Co., Ltd.Kure Office (72) Inventor Norio Shiraoka 11-1, Showa-cho, Kure City, Hiroshima Prefecture Kawamoto Construction Furnace Industry Co., Ltd.Kure Office (72) Inventor Yasuhiro Higashishima Kitakyushu, Fukuoka Prefecture 1-9-10 Sanno, Yahata-Higashi-ku, within Kuzuki Kogyo Co., Ltd. (72) Inventor Hirofumi Yamaguchi 1-9-10 Sanno, Yawata-Higashi-ku, Kitakyushu-shi, Fukuoka Kutsuki Kogyo Co., Ltd. (56) References JP JP-A-55-28354 (JP, A) JP-A-63-227713 (JP, A) JP-A-63-162855 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) C21C 7 / 10 F27D 1/16

Claims (1)

(57) [Claims] 1. A burner hood having an upper end in contact with a mounting flange of a pair of immersion pipes which is lifted and lowered by a driving device and mounted on an RH furnace, and a burner hood arranged at an intermediate portion of the burner hood and provided with a swirling flow. An external heating burner for heating the outside of the immersion pipe, and a pair of immersion pipes are arranged so as to be able to move up and down, respectively. A preheating drying apparatus for an RH furnace, comprising an internal heating burner.