JPH08276256A - Device for supplying powder for continuous casting - Google Patents

Abstract

PURPOSE: To scatter casting powder also in the back range part of a strand nozzle of a tundish on the surface of molten steel in a mold. CONSTITUTION: A powder container 1 is mounted on a swing arm 12, and a turning shaft 15 is arranged at the tip part of the swing arm 12 perpendicular downward, and an articulated robot arm 3 is fitted to the turning shaft 15. A powder scattering tube 2 is fitted to the tip hand 33 of the robot arm 3, and therefore, the tip part of the powder scattering tube 2 can freely be shifted to the front and back and the right and left directions. The powder scattering tube 2 is turned in the peripheral direction of the tube by an electric motor M2 arranged at the base end part thereof. The tip part of the powder scattering tube 2 has a bending part 21 bent downward and this bending part 21 executes the oscillating movement by the rotation of the powder scattering tube 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a powder distribution pipe in a powder supply device for continuous casting.

[0002]

2. Description of the Related Art As a conventional powder supply device, there is one disclosed in Japanese Patent Publication No. 4-57427 proposed by the applicant of the present application, the outline of which is shown in FIG. 6 and FIG. The front view and FIG. 7 are the same plan views. This powder supply device comprises a final powder storage container 1, a spray feeder 2, and an articulated robot arm 3. The final powder container 1 is mounted on the tip of a revolving arm 12 supported on the upper end of the column 11. The swing arm 12 rotates around the column 11. The final powder container 1 always receives the supply of casting powder from the storage popper via the supply pipe 13. This replenishment is done by pneumatic or mechanical transport. In the final powder storage container 1, a measuring device such as a load cell platform scale 14 is arranged, and the amount of the cast powder can be measured. In the robot arm 3, the base arm 31, the intermediate arm 32, and the tip hand 33 have a first joint 34 and a second joint 35, respectively.
It is movably connected by. The base arm 31 is attached to the tip of the revolving arm 12. Tip hand 3
A powder spraying tube 2 is fixed to 3. The powder-dispersing pipe 2 is provided with a spring feeder that rotates a spring in the pipe by an electric motor 21 provided at the base end of the powder-dispersing pipe 2 to disperse the casting powder from the tip onto the molten steel surface of the mold 4.

Reference numeral 5 denotes a tundish car equipped with a tundish 6, 6a denotes a strand nozzle, and 7 denotes a ladle. A sprinkling powder sprinkling state monitoring sensor 9 is arranged near the tip of the intermediate arm 32 of the articulated robot arm. Thereby, the molten steel exposed portion (hot spot) in the mold 4 is detected. Then, based on this detection, the articulated robot arm 3 is moved by automatic control by a computer to move the tip of the powder spraying tube 2 to a hot spot for spraying. There is also a method of spraying by moving the robot arm 3 according to a predetermined program without using a sensor. The base end of the powder spray tube 2 and the final powder storage container 1
The discharge port at the lower end of is connected by a flexible transfer pipe. The flexible transfer pipe is a transfer pipe such as a flexible pipe having a degree of freedom capable of following the movement of the robot arm 3. The flexible transfer pipe is arranged from the discharge port of the powder storage container 1 along the distal end of the revolving arm 12 and the robot arm 3 and reaches the base end of the powder spraying pipe 2, although not shown.

[0004] The casting powder is transferred from the final powder container 1 through the flexible transfer pipe to the powder distribution pipe 2 by natural fall. This free fall is
Although it is based on the energy saving idea that utilizes the height difference between the final powder storage container 1 arranged at a high place and the powder distribution pipe 2 at a low place, a means for forcibly transferring can also be added. The operation of this conventional example is as follows. (1) When the tundish car 5 stops at a predetermined position on the mold 4, the turning arm 12 rotates to move the feeding device from the retracted position I to the feeding position II. (2) The tip of the revolving arm 12 is rotated so that the supply device faces the mold. (3) The robot arm 3 moves to move the tip of the powder spray tube 2 onto the hot spot, and the casting powder is sprayed from the tip. (4) When replacing the tundish car, the supply device is returned to the retracted position in the reverse order of (1) and (2). In the above conventional example, a robot arm is used, but there is also a type that does not use this, and there is also a type in which the discharge port of the powder storage container and the base end of the powder spray pipe are directly connected. To do.

FIG. 5 is an explanatory view showing molten steel exposed portions of two types of molds and showing a non-spattering area of powder by a conventional powder supply device. In FIG. 5 (A), it is a plane explanatory view of the mold 4 having the substantially rectangular opening 41, and 62 is the portion where the tundish strand nozzle is located. Therefore, the nozzle does not interfere and the tip end opening 22 of the powder dispersion pipe 2 does not reach the molten steel surface in the region behind the nozzle. Therefore, the shaded area 1 in the figure
0 is a blind spot area where powder is not scattered. Similarly, FIG. 5B is a plan explanatory view of another type of mold, which has a substantially H-shaped opening 41.
There are two tundish strand nozzles. Therefore, in the portions 62, 62 where the nozzle is located, the nozzle interferes and the tip end opening 22 of the powder spraying pipe 2 does not reach the molten steel surface in the region behind the nozzle. Therefore, the two areas of the shaded portions 10 and 10 in the figure are blind spots where powder is not scattered.

[0006]

In the above-mentioned conventional powder supply device, the final powder container can be arranged at a high position in the working space of the mold so that it can be arranged on the operator side in a good working environment. Therefore, by using a robot arm, it is possible to evenly spread the casting powder sprayed from the powder spray pipe on the molten steel surface of the mold by computer control to eliminate the non-scattering surface, that is, to eliminate the blind spot. It was the original purpose. However, even in the above-mentioned conventional device, as shown in FIG. 5, the tip of the powder spray pipe does not reach the area behind the strand nozzle 6a of the tundish 6, and the casting powder is sprayed in this area. This was not possible, and this area was the blind spot in the spray area. An object of the present invention is to eliminate the non-dispersion region of the casting powder on the molten steel surface in the mold.

[0007]

In order to solve the above-mentioned problems, a first aspect of the present invention comprises at least a powder storage container and a powder spray pipe, and a discharge port of the powder storage container and a powder spray pipe are provided. In a continuous casting powder supply device that directly connects to the base end, or connects both via a powder transfer pipe, and sprays the pouring powder onto the molten steel surface in the mold from the tip opening of the powder spray pipe. Further, a rotating means for rotating at least the tip end portion of the powder distribution pipe 2 in the pipe circumferential direction is provided, and a bent portion 21 in which the tip end portion of the powder distribution pipe 2 is bent downward is provided.

A second aspect of the present invention comprises at least a powder storage container and a powder spray pipe, and the discharge port of the powder storage container and the base end of the powder spray pipe are directly connected, or both of them are connected. In a powder supply device for continuous casting, which is connected through a powder transfer pipe and which spreads casting powder from the tip opening of the powder distribution pipe onto the molten steel surface in the mold, at least the tip part of the powder distribution pipe 2 is in the pipe circumferential direction. An opening 22 is provided which is provided with a rotating means for rotating and which is opened in the peripheral portion of the tip of the powder spraying pipe 2.
Is provided.

[0009]

In the first aspect of the present invention, since the tip end portion of the powder spray tube 2 is bent and the tip end portion of the powder spray tube 2 is rotated in the pipe circumferential direction, the tip end is bent. The part 21 performs a swinging motion, and the pouring powder can also be sprayed onto the molten steel surface behind the strand nozzle 6a of the tundish 6. That is, the powder spray pipe 2 is located immediately on the side surface of the strand nozzle 6a of the tundish 6, and the powder spray pipe 2 is rotated and sent forward, so that the casting powder is also sprayed on the molten steel surface behind the nozzle 6a. can do. In the second aspect of the present invention, the tip end opening portion of the powder dispersion pipe 2 is closed, the opening portion 22 that opens to the peripheral portion of the tip of the powder distribution pipe is provided, and the powder distribution pipe 2 rotates. , The opening 22 on the peripheral side surface of the powder distribution pipe 2 is rotated,
Similarly to the above, the pouring powder can be sprinkled on the molten steel surface behind the strand nozzle 6a. The size of the spraying area behind the nozzle is, of course, the first
The powder-dispensing tube 2 of the invention described in (1) has a wider tip portion, and the longer the bent portion 21 at the tip of the powder-dispersing tube, the wider the spraying area.

[0010]

Embodiments will be described below with reference to the accompanying drawings. FIG. 1 is a front view showing an embodiment of the present invention. A turning shaft 15 is provided in the vertical direction at the tip of the turning arm 12, and a base end arm 31 of the robot arm 3 is fixed to the turning shaft 15. The intermediate arm 32 is connected to the lower end of the base arm 31 via the first joint 34. Further, the tip hand 33 is connected via the second joint 35. As a result, the intermediate arm 32 is rotated in the vertical direction (within the vertical plane) by the first joint 34, and the tip hand 33 is also rotated in the vertical direction (within the vertical plane) by the second joint 35. The powder spray tube 2 is fixed to the tip hand 33. A bent portion 21 bent at a right angle downward in the drawing is formed at the tip of the powder spray tube 2, and a tip opening 22 is formed.
Is facing down. An electric motor M2 as a rotating means for rotating the powder distribution pipe 2 around the central axis of the pipe body (in the circumferential direction of the pipe) is provided at the base end portion of the powder distribution pipe 2 on the root side. There is. By the operation of the electric motor M2, the powder spraying pipe 2 is rotated, and the bending portion 21 at the tip end portion thereof swings. As the rotating means, various driving means such as an air cylinder can be adopted instead of the electric motor M2.

Inside the powder distribution pipe 2, a spring feeder for sending the casting powder to the tip opening side of the distribution pipe 2 is built in, and the electric motor M1 operates this. The powder storage container 1 for storing the final casting powder is mounted on the swivel arm 12, and the discharge port of the powder storage container 1 and the base end of the powder distribution pipe 2 are connected by the powder transfer pipe 8 made of a flexible tube. The casting powder is transferred by a natural drop in the powder transfer pipe 8 and transferred from the powder storage container 1 to the powder distribution pipe 2. In this embodiment, a fixed amount feeder is provided at the discharge port of the powder storage container 1, and a fixed amount of powder is supplied into the powder transfer pipe and then supplied to the powder spray pipe 2. The casting powder supplied to the powder distribution pipe 2 is transferred inside the powder distribution pipe 2 by the spring feeder, and is spread on the molten steel surface in the mold from the opening 22 at the tip thereof.

FIG. 2 is a side view of the tip end side of the powder spraying tube 2, showing the swinging state of the bent portion 21. In this embodiment, the vertical length of the bent portion 21 is set within the range of 80 mm to 100 mm, and the range of the rotation angle is set so as to be rotated 45 degrees to the left and right. . FIG. 3 is an explanatory view illustrating a state in which casting powder is sprinkled on the molten steel surface in the mold 4 using the powder sprinkling tube 2 according to the present invention,
Particularly, the state in which the powder is sprayed behind the strand nozzle 6a is illustrated. In this figure, the front side is the back surface of the nozzle 6a. The powder spray pipe 2 is moved from the position P1 to a position P2 on the side of the strand nozzle 6a while spraying powder, and then the powder spray pipe 2 is rotated in the pipe circumferential direction. Sprinkle the powder while sending it to the front side of the middle page. Further, in this state, move the powder distribution pipe 2 from position P2 to position P
3, the powder spray tube 2 is moved to the back side of the paper surface in the figure, and spraying is performed to the back side of the strand nozzle 6a. Position P4 on the opposite side of the strand nozzle 6a
The same applies to the spraying at the position P5, and the powder spraying tube 2 is moved in the opposite direction to move from the position P4 to the position P5, and the casting powder is sprayed over the entire area behind the strand nozzle 6a. Can be done.

FIG. 4 is a perspective explanatory view of the tip end portion of the powder distribution pipe 2 according to another embodiment of the present invention. The tip of the powder distribution pipe 2 is closed, and the opening 22 is provided in the lower portion of the peripheral surface of the tip of the powder distribution pipe 22. As a result, the powder spraying tube 2 rotates in the circumferential direction of the tube, so that the opening 22 swings with a certain width. The operation procedure is the same as that of the powder spray pipe 2 of the above-mentioned embodiment, and the casting powder can be sprayed uniformly over the entire blind spot area on the back surface of the nozzle. In this embodiment, since the bent portion as in the above embodiment is not provided, the opening 2
The swinging distance of 2 is naturally shortened. In the figure, reference numeral 24 denotes a spring feeder, and this spring feeder 24 is a transfer means for transferring the powder transferred to the base end portion of the powder distribution pipe 2 to the opening 22 side.

Although the embodiments have been described above, the feature of the present invention is that the powder dispersion pipe 2 is used.
It depends on the tip shape and its rotational movement. In the above-described embodiment, the powder spray pipe 2 is configured so that the entire pipe is rotated in the pipe circumferential direction, but at least only the tip portion of the powder spray pipe 2 may be rotated. Of course. The length of the bent portion 21 at the tip of the powder spraying tube 2 can be appropriately set as needed. The bending angle is not limited to the right angle downward as in the above embodiment, but may be 90 degrees or less or more. The swinging rotation angle can also be freely set within the range of 90 degrees from the lower side to the upper side in the vertical direction. In the second example of the above-mentioned embodiment, a desired size can be formed also at a position where the opening 22 of the powder spraying tube 2 is provided at an appropriate position below the peripheral side surface of the tip.

[0015]

According to the present invention having the above-mentioned structure, when the casting powder is sprayed on the surface of the molten steel in the conventional mold, the casting powder is spread over the entire area on the surface of the molten steel behind the strand nozzle which is a blind spot. It has become possible to spray evenly. As described above, the invention of the present application exerts a great effect.

[Brief description of drawings]

FIG. 1 is a front view illustrating an embodiment of the present invention.

FIG. 2 is an explanatory view of a main part of a side surface of an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an operating state of an embodiment of the present invention.

FIG. 4 is a perspective view of a main part of another embodiment of the present invention.

FIG. 5 is an explanatory view showing a molten steel exposed portion of two types of molds and showing a powder non-dispersion region by a conventional powder supply device.

FIG. 6 is a front view of a conventional example.

FIG. 7 is a plan view of a conventional example.

[Explanation of symbols]

 2 Powder spraying pipe 21 Bending part 22 Opening part 3 Robot arm M2 Electric motor

Claims (2)

[Claims] 1. A powder storage container and at least a powder distribution pipe, wherein the discharge port of the powder storage container and the base end of the powder distribution pipe are directly connected, or both are connected via a powder transfer pipe. However, in a powder feeder for continuous casting that sprays the casting powder onto the molten steel surface in the mold from the opening of the tip of the powder spray tube, at least the tip of the powder spray tube (2) is rotated in the circumferential direction. A powder supply device for continuous casting, characterized in that a means (1) is provided and a bent portion (21) is formed by bending the tip of the powder distribution pipe (2) downward. 2. A powder container and at least a powder spray pipe, wherein the discharge port of the powder container and the base end of the powder spray pipe are directly connected, or both are connected via a powder transfer pipe. However, in a powder feeder for continuous casting that sprays the casting powder onto the molten steel surface in the mold from the opening of the tip of the powder spray tube, at least the tip of the powder spray tube (2) is rotated in the circumferential direction. A powder supply device for continuous casting, characterized in that it is provided with a means and an opening (22) opened at the peripheral portion of the tip of the powder distribution pipe (2).