JP2001335825A - Device for blowing oxygen and powdery material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatize the replacing work of a lance pipe for blowing oxygen and powdery material in an arc type electric furnace for steelmaking. SOLUTION: The blowing device for supplying the oxygen and the powdery material into molten metal in the arc type electric furnace for steelmaking, is constituted of a carriage which is formed so as to be freely moved at the front of the furnace, to insert the tip part of the lance pipe for blowing the oxygen and the powdery material from an inserting hole of the lance pipe at the bottom part of the blowing device, a lance pipe supplying mechanism which holds the lance pipe and also, supplies the new lance pipe according to the wear of the lance pipe, a lance pipe connecting mechanism which connects the new lance pipe with the worn and shortened lance pipe, and a rubber connecting mechanism which connects the base end part side of the new lance pipe in press-contact with a hose joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen furnace for automatically supplying oxygen and powder to a molten metal in a furnace by inserting the lance pipe insertion hole provided in a side portion of an electric arc furnace for steelmaking. And a powder blowing device.

[0002]

2. Description of the Related Art Conventionally, an arc type electric furnace for steel making, which heats electric energy as a heat source, employs oxygen,
As a means for supplying carbon or the like, a lance pipe for blowing oxygen, carbon powder or the like is used. A hose joint (rubber hose connection end) for connecting to a rubber hose for supplying oxygen and powder is connected to the base end of the blowing lance pipe, but the tip of the lance pipe is always in molten steel. Because of the immersion, the molten steel is gradually melted in contact with the high-temperature molten steel, so that the lance pipe for exhaustion has been remarkably consumed and frequent replacement of the lance pipe has to be performed. However, the replacement work of this blowing lance pipe is extremely hot because the work site is near the molten metal with high heat, and the dust adhering to the scrap steel is hoisting and falling. Therefore, the working environment is poor, and the molten metal in the furnace may be scattered to the workers. Therefore, there is a problem in terms of safety and working environment. Therefore, the oxygen and powder injection lance pipes are installed on a trolley, and the trolley is moved so that the operator can replace the oxygen injection lance pipe in a safe place. The replacement work of the lance pipe for blowing oxygen and powder was carried out at a remote safe position.

[0003]

However, such replacement work of the lance pipe for blowing oxygen is generally performed by removing the hose joint of the air supply hose screwed to the base end side of the shortened lance pipe for blowing oxygen. Then, screw the thread portion of the new blowing lance pipe into this screw portion and connect it, or insert the thread portion on the base end side of the new blowing lance pipe into the joint portion of the air supply hose. Then, a rubber packing is attached, and the rubber packing is strongly deformed by a fastening tool to seal so that gas leakage does not occur. Therefore, the rubber packing is strongly deformed, so that the slip-through easily occurs.
It is dangerous if the rubber packing is not replaced in about 0 to 40 times. Therefore, such a replacement work of the blowing lance cannot be automated by mechanizing and automatically connecting and disconnecting by screwing the lance pipe and the joint. The effort and time for that was enormous.

[0004]

Means for Solving the Problems The present inventor has made extensive studies in view of the above problems, and as a result, it has been impossible to mechanize and automate the connection by screwing a lance pipe and a hose joint. From the knowledge that the base end side of the lance pipe and the hose joint are connected by pressure contact and held as it is, it can be equivalent to connection and release by screwing, so automation by mechanization is possible Based on the above, the present invention has been completed.

[0005] That is, the oxygen and powder blowing apparatus of the present invention is characterized in that the tip of the lance pipe for blowing oxygen and powder is inserted from the lance pipe insertion port provided on the side of the electric furnace for steelmaking. In the oxygen and powder blowing device for supplying oxygen and powder to the molten metal in the inside, in order to insert the tip of the lance pipe for blowing oxygen and powder into the bottom of the blowing device from the insertion opening of the lance pipe. A trolley formed to run freely in front of the furnace, an inclined gantry for inclining a lance pipe on the trolley and inserting it into the furnace, and a lance pipe mounted on the inclined gantry for blowing oxygen and powder. A lance pipe supply mechanism for blowing oxygen and powder for gripping and supplying a new lance pipe according to consumption of the lance pipe; A lance pipe stocker for replenishing the supply section with a lance pipe, a lance pipe connecting mechanism for connecting a new lance pipe to the worn and shortened lance pipe, and a base end side of the new lance pipe. And a rubber hose connection mechanism for pressing and connecting the hose joint to the hose joint.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [I] Oxygen and Powder Injection Device (1) Overview As shown in FIG. A device for supplying oxygen and powder to the molten metal 4 in the furnace 2 by inserting the tip 3a of the lance pipe 3 for blowing oxygen and powder from the lance pipe insertion port 2a provided in the section. The blowing device 1 basically includes a lance pipe insertion port 2 and a tip portion 3a of a lance pipe 3 for blowing oxygen and powder.
A trolley 5 formed to run in front of the furnace for insertion from a
A gantry 6 for inclining the lance pipe 3 on the carriage 5 and inserting the lance pipe 3 into the furnace 2; and holding the lance pipe 3 placed on the gantry 6 for blowing oxygen and powder, A lance pipe supply mechanism 7 for supplying oxygen and powder for supplying a new lance pipe 3 in accordance with the consumption of the lance pipe 3, and a lance pipe for supplying the lance pipe supply mechanism 7 for supplying oxygen and powder. Lance pipe stocker 8, a lance pipe connecting mechanism 9 for connecting a new lance pipe 3 to the worn and shortened lance pipe 3, a base end 3b side of the new lance pipe 3 and a hose. And a rubber hose connecting mechanism 11 for connecting the joint 10 by pressing.

(2) Components Each component of the oxygen and powder blowing apparatus 1 of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view of an oxygen and powder blowing apparatus 1 of the present invention, and FIG. 2 is a plan view thereof.
As shown in FIGS. 1 and 2, the oxygen and powder blowing apparatus 1 of the present invention includes a carriage 5 for allowing the floor surface 12 to run freely and an inclined base 6 for inclining the lance pipe 3. Lance pipe supply mechanism 7 for supplying lance pipe 3 for oxygen and powder blowing,
A lance pipe stocker 8 for stocking the lance pipe 3, a lance pipe connecting mechanism 9 for connecting the lance pipe 3, and a rubber hose connecting mechanism 11 for connecting the lance pipe 3 and the hose joint 10. It is basically composed of the oxygen and powder blowing device portion 14 configured. If necessary, as shown in the plan view (a) and the side view (b) of the lance pipe storage mechanism 15 of FIGS. 3 (a) and (b),
5 is preferably provided.

(A) Moving device table (a) Truck At the bottom of the moving device table 13, as shown in FIG.
A truck 5 having wheels 16 for allowing the floor 12 to run freely is provided. The cart 5 has moved only in the lateral direction X with respect to the furnace 2 in FIGS.
It is also possible to make it possible to move also in the front-back direction Y. (b) Inclined pedestal An inclined pedestal 6 is provided at the upper part of the carriage 5 in the front-rear direction, and a hydraulic or pneumatic cylinder 17 is mounted on the rear side of the inclined pedestal 6. Therefore, by injecting hydraulic or pneumatic pressure into the hydraulic or pneumatic cylinder 17, the tilting gantry 6 can be inclined forward.

(B) Oxygen and powder blowing device part (a) Oxygen and powder blowing lance pipe supply mechanism FIG. 4 is a plan view of a powder blowing lance pipe feeding mechanism (lance pipe is not shown) ( a) and a front view (b), and FIG. 5 is a plan view (a), a front view (b), and a side view (c) of a lance pipe transfer guide roller in a powder blowing lance pipe. As shown in FIG. 2, the lancepipe rail 18a for blowing oxygen and the lancepipe rail 1 for blowing powder are provided on the inclined base 6 as shown in FIG.
8b, at least two rails 18a, 18b are mounted in the front-rear direction. Also, as shown in FIGS. 4 and 5,
Upper and lower rotating rollers 19a and 19b are formed on the front sides of the rails 18a and 18b, respectively, and saddles 20b are formed on the rear sides. The lance pipe 3 is moved by the upper and lower rotating rollers 19a and 19b. The center portion is clamped, and the saddle 20b grips the base end 3a side of the lance pipe 3.

Accordingly, as shown in FIGS. 4 and 5, the saddle 20b grips the base end 3a of the lance pipe 3 and travels on the rails 18a and 18b, whereby the lance pipe 3 rotates up and down. The vehicle can travel forward and backward by passing between the rollers 19a and 19b. Since the tip 3a side of the oxygen and powder blowing lance pipe 3 is constantly immersed in the molten steel 4 and is gradually melted in contact with the high-temperature molten steel 4, the length is gradually shortened. The saddle 20 on the rails 18a, 18b
The lance pipe 3 for blowing oxygen and powder is inserted into the furnace 2 by gradually moving the b toward the front side. Then, as shown in FIG. 1, when the saddles 20a, 20b travel to the position A (replacement position requiring a lance pipe), the saddles 20a, 20b are moved.
When b moves backward to the position C (retreat limit), the lance pipe stocker 8 prepares to supply a new lance pipe 3. Saddle 20 for lance pipe for oxygen injection
a and the saddle 20b for a lance pipe for blowing powder are:
Since there is a difference in the degree of wear between the lance pipe 3 for blowing oxygen and the lance pipe 3 for blowing powder, the lance pipes 3 can travel separately.

(B) Lance pipe stocker FIG. 6 is a front view (a) and a side view (b) of the powder injection lance pipe supply mechanism in a state where the powder injection lance pipe stocker is lowered. 10 is an enlarged sectional view (a) of a lance pipe stocker for blowing powder. In order to supply a new lance pipe 3 from the lance pipe stocker 8 onto the rails 18a and 18b, first, as shown in FIG.
Must be retracted to the position C (retraction limit) of the interval at which the can be inserted. Next, as shown in FIG. 7, hydraulic or pneumatic pressure is fed to the cylinder 23 of the positioning portion 22 of the lance pipe coupling mechanism 9 to move the stopper 24 to the old lance pipe 3.
Abut from the side of Then, as shown in FIG. 6, the position of the stocker 8 is lowered by the elevators 21a and 21b of the lance pipe stocker 8.

(C) Lance pipe connecting mechanism FIG. 7 is an enlarged front view (a), an enlarged plan view (b) and an enlarged side view (c) of the positioning portion in the lance pipe connecting mechanism, and FIG. FIG. 3 is a front view (a), a plan view (b), a cross-sectional view taken along line AA (c), and a side view (d) of the pipe connection mechanism. A new lance pipe 3 is attached to the shorter lance pipe 3 at the tip end side of the rails 18a and 18b.
Is provided with a lance pipe connecting mechanism 9 for connecting the two. In order to connect the new lance pipe 3 to the shortened lance pipe 3, first, the tip 3a side of the new lance pipe 3 at the lowermost stage of the lance pipe stocker 8 is stopped by the stopper of the positioning part 22 of the lance pipe coupling mechanism 9. The base end 3b of the shortened old lance pipe 3 placed on 24
Position so that it can be inserted into the hole of the connection coupling 25 on the side.

Further, the base end 3b of the new lance pipe 3
The side is placed on the guide plate 26 of the rubber hose connection mechanism 11 of the saddle 20b. Then, as shown in FIGS. 1 and 6, the saddle 20b is advanced on the rail 18b to a position B (lance pipe connection position), and a coupling for connection on the base end portion 3b side of a new lance pipe 3 is formed. 25 is the hose joint 1 of the rubber hose connection mechanism 11 of the saddle 20b.
When the new lance pipe 3 is pushed toward the distal end 3a while abutting on the rubber ring 10a, the coupling 2 on the distal end 3a side of the old lance pipe 3 as shown in FIG.
5 is pressed against the stopper 24 of the positioning portion 22 of the lance pipe coupling mechanism 9, so that the tip of the new lance pipe 3 is inserted into the hole of the connection coupling 25 on the base end 3b side of the old lance pipe 3. 3a side can be inserted. Then, while maintaining such a state, the upper hydraulic or pneumatic cylinder 27
a and a new lance pipe 3 which is worn and shortened by caulking the connection coupling 25 sandwiched from above and below by the indenters 28a and 28b of the upper and lower caulking portions 28 which are raised and lowered by the lower hydraulic or pneumatic cylinder 27b. Can be connected.

(D) Rubber Hose Connection Mechanism FIGS. 9A and 9B are a front view (a) and a plan view (b) of a rubber hose connecting portion for connecting and holding the base end side of a new lance pipe and a hose joint by pressing. ) And a side view (c). A new lance pipe 3 is connected to the lance pipe 3 which has become worn and shortened, and the lance pipe 3 becomes one.
In order to supply oxygen to the lance pipe 3 for blowing oxygen, it is necessary to connect a rubber hose 29a for supplying oxygen. Further, in order to feed the powder into the lance pipe 3 for blowing powder, it is necessary to connect a rubber hose 29b for powder supply. Therefore, a rubber hose connecting mechanism 11 for pressing and connecting the hose joint 10 to the hose joint 10 is provided on the base end side of each lance pipe 3. The rubber hose connection mechanism 11 includes a hydraulic or pneumatic cylinder 3
0, the indenter 31 is lowered, and the indenter 31 is brought into contact with the distal end portion 25a side of the connection coupling 25 on the base end portion 3b side of the lance pipe 3 so that the hydraulic or pneumatic cylinder 32
Thus, the proximal end 25b side of the connection coupling 25 can be pressed against and connected to the rubber ring 10a of the hose joint 10 by the lever 33 that moves. Therefore, the connection with the hose joint 10 can be maintained by keeping the lever 33 moved by the hydraulic or pneumatic cylinder 32.

(C) Lance pipe storage mechanism FIG. 3 is a plan view (a) and a side view (b) of a lance pipe storage mechanism in which a lance pipe is loaded on a lance pipe stocker, and FIG. 11 is a lance pipe storage mechanism. FIG. When the lance pipe 3 loaded on the lance pipe stocker 8 is used, a new lance pipe 3
Is moved to the lance pipe storage unit 15 to be loaded on the lance pipe stocker 8. Lance pipe storage unit 15
As shown in FIG. 11, a bundle of lance pipes 35 is placed on a belt 34, the binding is released, the belt 34 is wound up or loosened by a motor 36, and one of the belts is put on a stopper portion 37. Take out the stopper part 37
The lance pipe 3 is moved to the lance pipe stocker 8 by loosening the lever 38 and moving it along the guide 39 and moving the lever 40. When one of the lance pipe stockers 8 of the lance pipe stocker 8 is full, the lance pipe 3 is moved to the adjacent lance pipe stocker 8 for oxygen injection and moved. When the lance pipe stocker 8 for oxygen blowing becomes full, the lance pipe 3 moves and is moved to the lance pipe stocker 8 for powder blowing.

[II] Applications Conventionally, the oxygen and powder blowing apparatus of the present invention has been used by an operator to blow oxygen and powder from a lance pipe insertion port provided on the side of an electric arc furnace for steelmaking. Inserting the tip of the lance pipe and automatically replacing the lance pipe for blowing oxygen and powder to supply oxygen, carbon, etc. to the interface between the molten metal and slag in the furnace to save labor. It can be used as a device.

[0017]

A coupling 25 for connecting a lance pipe is attached to the proximal end of the lance pipe 3, and an indenter 31 is brought into contact with the distal end 25a of the coupling 25 for connecting the lance pipe 3 so that the indenter 31 is hydraulically or pneumatically operated. The coupling 25 is connected by a lever 33 moved by a cylinder 32.
The hose joint 10 is connected to the base end 3b of the lance pipe 3 by maintaining the state where the base end 25b of the lance pipe 3 is pressed against the rubber ring 10a of the hose joint 10. Conventionally, to connect a hose joint to the base end of the lance pipe, it is necessary for an operator to screw a screw part screwed to the hose joint to a screw part screwed to the base end of the lance pipe. Although it could not be possible, by taking the above-mentioned connection form, it becomes possible to mechanically automate the replacement work of the lance pipe for blowing oxygen and powder, and further, a lance pipe supply mechanism for blowing oxygen and powder, and Lance pipe stocker,
Furthermore, by combining a lance pipe storage mechanism, it has become possible to mechanically automate and save labor.

[0018]

The present invention will be further described with reference to the following examples.
Explain physically. Example 1 Injection of oxygen and powder having a total length of 8 m as shown in FIGS. 1 and 2
Using the device, the steel furnace was equipped on the side of the electric arc furnace for steelmaking.
42.5 mm in diameter and long from the lance pipe insertion opening
Add a 4m lance pipe and add 10m oxygen
Lance pipes and powder injection lance pipes 1
9kg / cm ²Pressure inside the furnace
Oxygen and coke powder with a particle size of 0.1 to 1 mm
Powder was supplied.

As a result, when the lance pipe for blowing powder becomes short and the total length of the lance pipe becomes 6 m,
Since the saddle is advanced to the position A in FIG. 1, the saddle is retracted to the position C in order to connect a new lance pipe, and then the lance pipe stocker for powder injection of the lance pipe supply mechanism is connected. Descend. Then, when the saddle is advanced again and gradually advances to the position B, the distal end side of the new lance pipe is inserted into the hole of the connection coupling on the proximal end side of the old lance pipe, and the old lance pipe is inserted. As the lance pipe is pushed, the connection coupling on the tip side of the old lance pipe hits the stopper of the positioning part of the lance pipe connecting mechanism, and the upper hydraulic or pneumatic cylinder and the lower hydraulic or pneumatic cylinder of the lance pipe connecting mechanism. Raise and lower the indenter of the upper and lower caulking part, sandwich the connection coupling for the lance pipe that has been worn and shortened from both the upper and lower directions, crimp and deform this connection coupling, and insert it into the connection coupling A new lance pipe is connected to the old lance pipe by pressing against the tip of the new lance pipe.

Next, the indenter is lowered by the hydraulic or pneumatic cylinder of the rubber hose connecting mechanism, and the indenter is brought into contact with the distal end side of the connection coupling on the base end side of the lance pipe, and is moved by the hydraulic or pneumatic cylinder. The connection with the hose joint is maintained by pressing the base end side of the connection coupling to the rubber ring of the hose joint with the lever to be connected. Then, the lance pipe in which the new lance pipe was connected to the old lance pipe was inserted from the lance pipe insertion opening of the arc furnace for steelmaking, and the lance pipe for blowing oxygen and powder was inserted and the blowing of oxygen and powder was restarted. .

[0021]

As described above, the oxygen and powder blowing apparatus of the present invention automates the work of replacing a lance pipe for blowing oxygen and powder in a steelmaking arc electric furnace that heats using electric energy as a heat source. Therefore, there is no need for the operator to work in front of the furnace near the high-temperature molten metal at a very high temperature and in a poor working environment in which dust falls, and the molten metal in the furnace scatters to the workers. Since there is no such thing, it is also good in terms of safety.

[Brief description of the drawings]

FIG. 1 is a front view of the oxygen and powder blowing apparatus of the present invention.

FIG. 2 is a plan view of the oxygen and powder blowing apparatus of the present invention.

FIG. 3 is a plan view (a) and a side view (b) of a lance pipe storage mechanism in which a lance pipe is being loaded on a lance pipe stocker.

FIGS. 4 (a) and 4 (b) are a plan view (a) and a front view (b) of a powder blowing lance pipe supply mechanism.

FIGS. 5 (a), (b) and (c) are a plan view (a), a front view (b) and a side view (c) of a lance pipe transfer guide roller in a powder blowing lance pipe. It is.

6 (a) and 6 (b) are a front view (a) and a side view (b) of a powder injection lance pipe supply mechanism in a state where the powder injection lance pipe stocker is lowered.
It is.

7 (a), 7 (b) and 7 (c) are an enlarged front view (a), an enlarged plan view (b) and an enlarged side view (c) of a positioning portion in the lance pipe coupling mechanism.

8 (a), 8 (b), and (c) and (d)
Fig. 3 is a front view (a), a plan view (b), a cross-sectional view taken along line AA (c), and a side view (d) of a lance pipe connecting mechanism for connecting a lance pipe for powder blowing.

FIGS. 9 (a), 9 (b) and 9 (c) are front views (a) of rubber hose connecting portions for connecting and holding a base end side of a new lance pipe and a hose joint by press-contacting. ),
It is a top view (b) and a side view (c).

FIG. 10 is an enlarged sectional view (a) of a lance pipe stocker for blowing powder.

FIG. 11 is a front view of a lance pipe storage mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oxygen and powder injection apparatus 2 Electric arc furnace for steelmaking 2a Lance pipe insertion opening 3 Lance pipe for oxygen and powder injection 3a Tip 3b Base end 4 Molten metal 5 Dolly 6 Inclined pedestal 7 Lance for oxygen and powder injection Pipe supply mechanism 8 Lance pipe stocker 9 Lance pipe connection mechanism 10 Hose joint 10a Rubber ring 11 Rubber hose connection mechanism 12 Floor surface 13 Moving device base portion 14 Oxygen and powder blowing device portion 15 Lance pipe storage mechanism 16 Wheels 17 Hydraulic or pneumatic Cylinder 18a Oxygen blowing lance pipe rail 18b Powder blowing lance pipe rail 19a Upper rotating roller 19b Lower rotating roller 20a, 20b Saddle 21a, 21b Elevator 22 Positioning unit 23 Cylinder 24 Stopper 25 Connection Coupling 25a distal end 25b proximal end 26 guide plate 27a upper hydraulic or pneumatic cylinder 27b lower hydraulic or pneumatic cylinder 28 upper and lower caulking sections 28a, 28b indenter 29a rubber hose for oxygen supply 29b rubber hose for powder supply 30 hydraulic or pneumatic cylinder 31 Indenter 32 Hydraulic or pneumatic cylinder 33 Lever 34 Belt 35 Bundle of lance pipes 36 Motor 37 Stopper part 38 Lever 39 Guide 40 Lever A A position (Lens pipe replacement required position) B B position (Lance pipe connection position) C C Position (retreat limit)

Continued on the front page (72) Inventor Yukio Hagiwara 1395 Ikejiri, Yumezen-cho, Shima-gun, Hyogo Pref.

Claims (4)

[Claims] 1. An oxygen- and powder-feeding lance pipe is inserted through a lance pipe insertion port provided on a side of an arc type electric furnace for steelmaking to supply oxygen and powder to molten metal in the furnace. A trolley formed so as to be able to run in front of a furnace in order to insert the tip of a lance pipe for blowing oxygen and powder into the bottom of the blowing apparatus through an insertion port of the lance pipe; A gantry for inclining a lance pipe on a trolley and inserting the lance pipe into the furnace, and holding the lance pipe for oxygen and powder injection placed on the gantry, according to the consumption of the lance pipe A lance pipe supply mechanism for supplying a new lance pipe for supplying oxygen and powder, and a lance for supplying a lance pipe to the lance pipe supply section for supplying oxygen and powder. A lance pipe connecting mechanism for connecting a new lance pipe to the lance pipe that has been worn and shortened, and a lance pipe connecting mechanism for pressing and connecting the base end side of the new lance pipe and the hose joint. An oxygen and powder blowing apparatus, comprising: a rubber hose connection mechanism. 2. The oxygen and powder supply system according to claim 1, wherein the rubber hose connection mechanism holds the coupling side of the lance pipe for blowing oxygen and powder while pressing the coupling side against a seal member formed on the hose holding portion. Blow device. 3. The oxygen and powder blowing apparatus according to claim 1, further comprising a lance pipe storage mechanism for supplying a lance pipe for blowing oxygen and powder to the lance pipe stocker. 4. The oxygen and powder blowing apparatus according to claim 1, wherein a lance pipe connection coupling is connected to a side of the lance pipe connected to the hose joint of the lance pipe.