JPH11239854A - Powder charging apparatus for continuous casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder charging apparatus which is large in degree of spatial freedom around a mold, and caused no troubles in installing other equipment by abutting a sliding member mounted on a lower part of a chute on a guide so that a tip part of a powder charging chute is made to confront an upper part on a mold side when the powder charging chute is turned, and connecting a hopper above the chute to a powder storage tank through a powder feeder. SOLUTION: A guide 9 to guide a charging chute 4 is provided in the vicinity of a tip part of a traveling truck 2 so that its tip part is made to confront an upper part of a mold side part when the chute 4 is turned. Because a sliding member abutted on the guide 9 is mounted on a lower part of the chute 4, the chute 4 is also moved on a chute holding part 5 according to the movement of the sliding member along the guide 9, the position of the tip is constantly moved in parallel to the long side of a mold 1 even when the angle of the chute 4 is changed, and the distance between the tip of the chute 4 and the mold 1 is kept constant. The space can also be saved by using a powder feeder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder casting apparatus for continuous casting, and more particularly to a powder casting apparatus capable of uniformly spreading powder on the surface of molten steel in a casting mold for continuous casting, and quickly and automatically feeding powder to a desired location as needed. The present invention relates to a powder input device capable of performing the above-mentioned operations.

[0002]

2. Description of the Related Art In continuous casting of steel, a surface of molten steel (hereinafter referred to as a molten metal surface) injected into a mold is coated with SiO ₂ , C
Powder containing aO or the like as a main component is introduced to prevent oxidation of the molten metal surface, absorb inclusions in the steel in the mold, and lubricate the mold wall and molten steel. In recent years, a powder automatic input device has been developed for this powder input operation instead of manual operation, and mechanical input is generally performed.

[0003] Various systems have been proposed as conventional powder feeding devices, and some of the typical systems are briefly described as follows. A screw feeder is arranged in parallel with the long side of the mold and on the center of the mold, and the powder is fed from the slit or many discharge holes at the bottom of the case of the feeder body corresponding to the long side of the mold to the mold surface in the long side direction. A method of feeding in parallel and linearly (Japanese Utility Model Laid-Open No. 51-114413). Contrary to the above, a discharge end of a spring feeder, a screw feeder, or the like faces the inside of the mold from a direction perpendicular to the long side of the mold, and the feeder is moved or turned in parallel to move the powder input position in the long side of the mold. A possible method (Japanese Utility Model Publication No. 51-48581).

The powder is directly fed into the mold by pneumatic feeding, and the tip of the pneumatic pipe is moved in the same manner as described above, or the pneumatic pipe is formed into a loop, and the loop pipe is made to face the mold, and the loop pipe is formed. A method of feeding powder from the lower slit or multiple holes (Japanese Patent Publication No. 53-25532)
No. 51-14207). A feeding device having a powder discharge hole substantially equal to the length of the mold in the long side direction, and a method of feeding using a fluidization of powder by a belt feeder or pneumatic feeding (Japanese Utility Model Application Laid-Open No. 54-13631).
No. 7). A method that has a plurality of powder feed mechanisms and feeds them into molds in appropriate amount units (JP-A-51-100932).

However, with the recent high-speed casting and continuous casting of high-grade steel types in continuous casting, the importance of powder has increased, and higher quality powder has been used. There is a demand for a dosing method that maximizes the powder effect. In order to improve the effect of the powder, it is necessary to form a substantially uniform molten powder layer over the entire surface of the molten metal. It is difficult to expect that the molten metal will spread over the entire surface of the molten metal.

Further, even if powder is poured linearly along the center of the mold in a direction parallel to the long side of the mold, the effect is increased more than the point-like charge, but it cannot be said that a sufficient effect is obtained. We have to shift to introducing the whole area. However, even with the method of uniformly pouring powder into each part of the entire surface of the bath,
There are the following problems, and it cannot be said that it is an efficient input.

First, due to the effect of the jet from the nozzle immersed in the molten steel, there is a flow of the molten steel on the surface of the molten metal. It has been confirmed that there will be more than places.
Secondly, the required amount of powder is not the same in other places, and it is difficult to maintain perfect verticality of the nozzle due to physical errors when mounting the immersion nozzle in the tundish. The immersion nozzle is still slightly tilted, and this is one of the factors. Due to differences in the molten steel jet velocity flowing out from the nozzle tip and variations in the molten steel temperature, etc. Strictly speaking, the required powder input amounts are all different.

For example, it has been confirmed in actual work that the required amount of powder on the right side and the left side of the nozzle may differ by more than 20% in a normally symmetric mold. Further, since the required amount at each position changes as the casting time elapses, it is not always appropriate to take a fixed input amount at each position. Therefore, in the conventional charging method described above in view of these points, an improper linear charging method or a fixed charging method that does not consider the difference in required powder amount at each position is used. However, it was not possible to maximize the powder effect. In addition, there is a lack of quickness when performing partial powder dosing (it takes a long time to do so), and there are structures that can hinder other equipment around the mold or casting work. There is also a drawback that it is defective.

[0009] In contrast to the above conventional examples having such various disadvantages, the present applicant proposed in Japanese Patent Publication No. 60-57937 a powder casting apparatus for continuous casting in which these defects were eliminated and used for many years in actual work. doing. This device is shown as a side view in FIG. 5A and a plan view in FIG.

The powder in the powder storage tank 11 is supplied to a powder input chute 4 having a movable tip by a feeder 12 and is extruded into a mold 1 by a pusher 3 so that the powder is uniformly dispersed on the surface of molten steel. It is automatically loaded at the desired location. The configuration is such that a powder holding chute 4 is slidably held in a chute axial direction by a chute holding portion 5 which is rotatably mounted on the traveling carriage 2, and is located near the mold 1 at a position parallel to the long side of the mold.
The feeding chute 4 is provided with a guide 9 that slides in contact with the feeding chute 4, and a flexible screw conveyor is arranged as a powder feeder 12 having a tip connected to the feeding chute 4 and a rear end connected to a powder storage tank 11. That is, a pusher 3 for extruding an appropriate amount of powder supplied into the chute 4 into the mold is provided in the input chute 4.

[0011]

As described above, according to Japanese Patent Publication No. 60-57937, it is required that the powder can be uniformly supplied to the surface of the molten metal in the continuous casting mold, and that the required input amount is partially increased. This is an apparatus having an excellent effect that a corresponding treatment can be performed quickly even in this case. However, when the powder input chute 4 (hereinafter, referred to as input chute) is turned in the longitudinal direction of the mold, the input chute is used as it is. 4 The tip has an arc-shaped trajectory, and may be separated from the mold (particularly when the width is long in a flat mold).

Therefore, the rear end of the input chute 4 is projected from the chute holder 5, and the rod of the pressing cylinder 7 installed on the input chute holder 5 is attached thereto to apply a pressing force in the mold direction, and to apply the input chute. 4 is provided with a sliding roller 8 at the lower part on the tip side thereof, which is configured to abut on a guide 9 fixed on a mold cover in parallel with the long side of the mold 1, so that the input chute 4 turns and the input chute Even if the angle of 4 changes, the input chute 4 is always pushed forward by the pressing force of the pressing cylinder 7 and the tip of the input chute 4 moves in parallel with the long side of the mold 1. Consideration is made so that the distance between the two is almost constant.

In such an apparatus, the guide must be fixedly disposed on the mold cover, and therefore the guide must be always attached to the mold cover. Furthermore, in recent years, it has become increasingly necessary to install various measuring instruments near the mold in order to stabilize the casting state, and thus it is required that the mold cover has as much space as possible as much as possible.
Further, since the mold cover portion is heated by radiation and heat transfer from molten steel, the cover is easily deformed by the heat, and this is not a preferable location for disposing the guide.

The present invention solves the drawbacks of the conventional powder dosing equipment, and has excellent workability, and has a large degree of freedom around the mold in terms of space, and does not hinder the installation of other equipment. It is intended to provide a device.

[0015]

The present invention adopts the following means to solve the above-mentioned problems. (1) A chute holding portion rotatably mounted on the traveling trolley holds the powder input chute slidably in the axial direction of the chute. A guide is provided so that the leading end faces above the side of the mold, and a sliding member is attached to the lower part of the charging chute to make contact with the guide, and the leading end is connected to a hopper provided above the charging chute. A powder feeder having an end connected to a powder storage tank, and a pusher for pushing out an appropriate amount of powder supplied to the chute into the casting chute in the charging chute; .

(2) The powder casting apparatus for continuous casting according to claim 1, wherein the guide is an arc having a shape opposite to the circular arc drawn by the tip of the chute. (3) The powder casting apparatus for continuous casting according to claim 1, wherein the guide has a polygonal shape that is approximated in the opposite direction to the turning arc drawn by the tip of the charging chute.

(4) The degree of the arc of the guide is determined by the distance between the sliding member attached to the turning chute and the axis of the chute. 2. The powder feeding device for continuous casting according to 1.). (5) The guide has a rail shape having a vertical sliding surface in a vertical cross section, and a sliding member abutting on the guide is a vertical cylindrical rolling roller, and a shaft bearing member of the rolling roller is loaded. The powder casting apparatus for continuous casting according to any one of claims 1 to 4, wherein the powder casting apparatus is fixed to a lower portion of the chute.

(6) The guide has a groove rail shape having a vertical concave section, and the sliding member abutting on the guide is a vertical cylindrical rolling roller fitted in the concave groove rail, 5. The powder casting device for continuous casting according to claim 1, wherein the shaft bearing member of the rolling roller is fixed to a lower portion of the loading chute. (7) The guide has a rail shape having a vertical cross-section convex shape, and the sliding member abutting on the guide is two vertical cylindrical rolling rollers rolling on both sides of the convex rail, The powder casting apparatus for continuous casting according to any one of claims 1 to 4, wherein a shaft bearing member of the rolling roller is fixed to a lower portion of the casting chute.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a powder feeding device according to the present invention will be described with reference to the drawings. FIG. 1 shows an example of a powder feeding device according to the present invention.
Reference numeral 1 denotes a mold for continuous casting, and reference numeral 2 denotes a traveling carriage on the long side of the mold 1 and traveling on a rail. On the carriage, a loading chute 4 having a pusher 3 is slid with respect to a loading chute holding section 5. The chute holder 5 is attached to the traveling vehicle 2 via a pivot 6. Although not particularly shown, the turning drive unit may be of any type such as a combination of a screw jack and a crank, a worm gear system or a gear system. Here, reference numeral 11 denotes a powder storage tank mounted on the rear part of the traveling vehicle 2, and a powder feeder 12 connects between the powder storage tank 11 and the hopper 13 (located in front of the retracted pusher 3). For example, a flexible screw conveyor is provided.

Further, the present invention provides a case where the charging chute 4 is turned in the longitudinal direction of the mold as described in the above-mentioned section.
If it is left as it is, the leading end of the chute forms an arc-shaped trajectory, and the distance from the mold fluctuates, which is not preferable. Therefore, an optimal guide mounting position has been developed in order to compensate for the defect by the guide.

First, the guide 9 installed on the mold cover is stopped, and the guide 9 for guiding the throwing chute 4 near the tip of the traveling vehicle 2 is turned when the throwing chute 4 turns. It is provided so as to face the upper side. The guide 9 is formed so as to draw an arc opposite to the trajectory of the turning arc drawn by the tip of the throwing chute 4. This inverted arc shape is specified by the distance between the chute 4 and the turning axis. Further, as shown in FIG. 3, the guide 9 can be formed in an inverted polygonal shape approximated to a turning arc drawn by the tip of the input chute 4, and in this case, the guide 9 sets the length of one side of the polygonal shape. It is more preferable that the input chute 4 is formed so as to match the distance that the input chute 4 moves in the mold width direction.

Since the sliding member 8 abutting on the guide 9 is attached to the lower portion of the input chute, when the sliding member 8 moves along the guide 9, the input chute 4 also moves accordingly. Because of the movement on the holding unit 5, even if the angle of the injection chute 4 changes, the tip position of the injection chute 4 always moves in parallel with the long side of the mold 1, and as a result, the tip of the injection chute 4 The distance can be kept constantly constant.

FIG. 2 is a plan view of the powder dosing device to which the charging chute 4 of FIG. 1 is attached. It shows that it keeps a certain distance from. The charging chute 4 is formed in a gutter shape, and the material thereof is not particularly limited. However, since it is used in a high-heat atmosphere, it has corrosion resistance and heat resistance, and also has good slippage and does not easily adhere to powder. It is good to choose.

The width of the chute 4 is preferably a width suitable for the size of the section so that when the entire surface of the mold is divided into an optimum number, the powder can be uniformly poured into the entire section. In addition, pusher 3
Is preferably constituted by, for example, a pneumatic or hydraulic cylinder so that the extrusion speed thereof can be adjusted. In addition, in order to charge the powder uniformly over one section,
A guide blade can be attached to the tip of the charging chute. Thus, the powder can be charged in a short time by the charging chute 4 and the pusher 3, and the width of the chute in the longitudinal direction of the mold and the pressing force of the pusher 3 in the short side direction are uniform for each section. Spraying becomes possible.

The moving speed of the input chute 4 in the longitudinal direction of the mold can follow, for example, automatic control by a sensor.
In addition, it is desirable that the speed be as high as possible from the viewpoint that the powder is charged into the required portion quickly. By doing so, the number of powder inputs can be increased. Further, in order to ensure that the closing chute 4 is stopped at a predetermined position, a necessary number of limit switches, cam switches, and the like may be provided on the traveling carriage 2 or a pulse encoder may be used.

Further, the powder supply will be described in detail.
Powder feeder (flexible screw conveyor) 1
A hopper 13 is provided at a position above the input chute 4 at the front end of the hopper 2, and a slide gate (not shown) is provided below the hopper 13, and the gate is opened to supply one powder to be injected into the mold. Discharge on the chute 4 and close the gate. After this, the powder feeder 12 continues to be driven even when the pusher 3 pushes the powder into the mold and continues to supply the powder to the hopper 13, so that the continuous operation can be performed and the cycle time is shortened. Can be achieved. If this powder feeder 12 is used, it can be fed with one screw, and the space is small.

Further, if the traveling carriage 2 is capable of moving forward and backward with respect to the mold 1, it can be retracted when the tundish car travels at the time of casting, so that it does not hinder other operations, and does not interfere with other equipment. Interference can be avoided. In the case of the traveling method, it is necessary to have a certain degree of accuracy of the stop position of the bogie at the time of powder input, so that high-speed and low-speed two-stage switching is desirable. It is preferable to attach a device.

Next, the guide 9 and the contact member 8 that comes into contact with the guide 9 in the apparatus of the present invention will be described. The guide 9 is provided at an appropriate place near the front end of the traveling carriage 2 and the shooting chute 4 is provided.
The tip of the input chute 4 is provided so as to face the upper side of the mold with respect to the swivel arc, and the shape thereof is formed so as to be substantially opposite to the swivel arc of the input chute 4 and attached to the lower portion of the input chute 4 The degree of arc is specified and designed based on the distance between the sliding member 8 and the rotation axis of the input chute 4. Thus, the charging chute 4 can keep a constant distance from the mold over the entire length of the mold in the long side direction (width direction).

The contact between the guide 9 and the sliding member 8 may take various forms. For example, as shown in FIG. A rod of the pressing cylinder 7 installed on the input chute holding section 5 is attached, a pressing force is applied in the mold direction, and a support member 10 for holding a vertical cylindrical sliding roller shaft is provided below the input chute 4. When this is vertically contacted with a cross-sectional rail guide 9a having a vertical sliding surface, the input chute 4 turns, and the input chute 4
The chute 4 is always pushed forward by the pressing force of the pressing cylinder 7 even if the angle changes, and the tip of the chute 4 moves parallel to the long side of the mold 1.

As shown in FIG. 4 (a), the guide 9 is a groove rail 9b having a concave cross section, the sliding member 8 is a rolling roller which can be inserted into the rail groove, and holds the shaft of the rolling roller. The supporting member 10 to be fixed is fixed to a lower portion of the input chute 4.
The diameter of the rolling roller inserted into the concave rail groove is slightly smaller than the width of the concave inner surface, and by contacting any one of the concave inner surfaces, the guide of the input chute 4 is accurately performed. Can be done. In this case, the pressing cylinder 7 as described above is not required, and there is an effect that the equipment cost can be reduced.

Further, as shown in FIG.
Is a rail 9c having a convex cross section, and the sliding member 8 is composed of two rolling rollers that roll while sandwiching both sides of the convex rail 9 and a supporting member 10 that holds the axis of the rolling roller. By fixing the bearing member 10 below the input chute 4, the same effect as that shown in FIG. 4A can be obtained.

Next, an example of a powder supply operation using the apparatus of the present invention will be described. When the powder carrier is driven, the traveling vehicle 2 is driven and stopped when it reaches a predetermined position, and the vehicle 2 is fixed at that position. At this time, the storage tank 11
Drives the powder feeder 12 and puts the powder into the hopper 1
When the chute 4 is moved toward a desired pouring point on the surface of the mold 1, the slide gate of the hopper 13 is opened to supply powder onto the chute 4. Next, the pusher 3 is operated, and the powder is poured and sprayed on the surface of the molten metal. Since the powder application is not a point or linear application but a planar application, the powder application is uniformly applied over the entire divided portion.

As described above, since the amount of powder consumed on the surface of the molten metal varies depending on the position of the mold and changes with time, the number of injections of the sections having a large amount of powder consumption is optimally set in advance and programmed. The apparatus of the present invention can be operated based on the above, and the powder can be charged automatically. In addition, it is possible to constantly grasp the level of the molten metal by means of a separately installed molten metal level detecting device, link this to the powder charging device, and replenish the powder to the required location each time the molten metal level changes.

[0034]

According to the powder dosing device of the present invention, the powder dosing effect is maximized and the mold cover does not have a guide for the powder dosing equipment.
The degree of freedom in space around the mold is increased, which is preferable for casting. Further, since the guide itself is installed on the traveling carriage, it is possible to freely take an optimal structure when the guide comes into contact with the sliding member. In addition, there is no occurrence of unevenness and the like, and a countermeasure against powder injection can be performed on the input device main body side, so that the device becomes independent and has a great effect of contributing to continuous casting work.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a powder feeding device of the present invention.

FIG. 2 is a plan view showing a part of FIG. 1;

FIG. 3 is a diagram showing an example of a guide having a polygonal shape.

FIG. 4 is a diagram showing an example of a contact state between a charging chute and a sliding member.

FIG. 5A is a side view and FIG. 5B is a plan view showing an example of a conventional powder feeding device.

[Description of Signs] 1 Mold 2 Traveling Cart 3 Pusher 4 Powder Injection Chute 5 Chute Holder 6 Rotating Axis 7 Pressing Cylinder 8 Sliding Member (Rolling Roller) 9 Guide 10 Bearing Member 11 Powder Storage Tank 12 Powder Feeder 13 Hopper

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Takanori Yoshiaki 6-11 Akane, Kawasaki-ku, Kawasaki-shi, Kanagawa

Claims (7)

[Claims] 1. A chute holding portion rotatably mounted on a traveling vehicle holds a powder input chute slidably in the axial direction of the chute. A guide is provided to make the tip of the injection chute face upward of the mold side, and a sliding member is attached to the lower part of the injection chute to abut the guide, and the tip is connected to a hopper provided above the injection chute. A powder feeder having a rear end connected to a powder storage tank, and a pusher for pushing out an appropriate amount of powder supplied to the chute into the casting chute in the charging chute. Input device. 2. The powder casting apparatus for continuous casting according to claim 1, wherein the guide is an arc having a shape opposite to a turning arc drawn by the tip of the injection chute. 3. The powder casting apparatus for continuous casting according to claim 1, wherein the guide has a polygonal shape that is approximately opposite to the turning arc drawn by the tip of the chute. 4. The guide according to claim 1, wherein a degree of the arc is determined by a distance between a sliding member attached to the turning chute and the axis of the chute.
4. The powder casting apparatus for continuous casting according to claim 3. 5. The guide has a rail shape having a vertical sliding surface in a vertical cross section, and a sliding member abutting on the guide is a vertical cylindrical rolling roller, and a shaft bearing member of the rolling roller. The powder casting apparatus for continuous casting according to any one of claims 1 to 4, wherein the powder is fixed to a lower portion of the casting chute. 6. The guide has a groove rail shape having a vertical cross-sectional concave shape, and a sliding member abutting on the guide is a vertical cylindrical rolling roller fitted into the concave groove rail,
5. The powder casting device for continuous casting according to claim 1, wherein the shaft bearing member of the rolling roller is fixed to a lower portion of the loading chute. 7. The guide has a rail shape having a vertical cross-section convex shape, and a sliding member abutting on the guide is composed of two vertical cylindrical rolling rollers rolling on both sides of the convex rail. The powder casting apparatus for continuous casting according to any one of claims 1 to 4, wherein a shaft bearing member of the rolling roller is fixed to a lower portion of the casting chute.