A continuous casting ladle sand discharge device and its use method

Abstract

The present invention belongs to the field of metallurgical equipment technology, specifically relating to a continuous casting ladle drainage sand discharge device and its use method. The present invention utilizes an annular left-connected sand trough and an annular right-connected sand trough, forming a full-ring inner bore, as a channel for the molten steel to fall. A drainage cone is positioned at the upper end of the channel. As the drainage sand falls, the cone acts to cause it to fall into the interiors of the first and second sand holding chambers below, enabling recovery. When the molten steel contacts the drainage cone, the high temperature causes the cone to melt and flow along with the molten steel from the channel into the tundish below, preventing the molten steel from contacting the annular left and right sand troughs. After the drainage sand is recovered, a separation mechanism separates the annular left and right sand troughs to either side of the molten steel flow. This effectively prevents splashing caused by contact between the annular left and right sand troughs during movement, thereby extending the service life of the discharge device.

Description

Technical Field

[0001] The present invention belongs to the technical field of metallurgical equipment, and in particular relates to a continuous casting ladle sand discharge device and a method for using the device. Background Art

[0002] With the vigorous development of modern science and technology, the quality requirements for steel in various fields are becoming increasingly stringent. At present, the drainage sand used in the ladle of most large-scale steel production enterprises is usually mainly chromium ore. The chromium ore ladle drainage sand is mainly composed of chromite and quartz phase. The quartz phase contains a large amount of impurities such as Al2O3, K2O and CaO. Some chromite contains impurities such as magnesium silicate. If the drainage sand is directly flushed into the molten steel during the ladle pouring process, some of the drainage sand will not float up and be discharged during the subsequent continuous casting process, seriously affecting the quality of the steel. At present, most steel companies do not perform special cleaning on the drainage sand used in the ladle. Some companies have adopted air blowing cleaning or other similar methods. However, the drainage sand cleaning process during the ladle pouring process is not thorough.

[0003] Chinese patent document CN211638303U (202020197278.3) discloses a drainage sand cleaning device for the continuous casting ladle pouring process, the device is provided with an uncovered inverted frustum-shaped iron shell, a rotating cover is provided on the bottom side, and a sand discharge port is provided on the rotating cover; a conical cardboard shell is provided on the uncovered inverted frustum-shaped iron shell, the device is also provided with a holding rod, the holding rod is a steel pipe, and a positioning hole is provided in the middle of the holding rod; a holding rod positioning support device is provided on the pouring platform, and the holding rod is placed on the holding rod positioning support device through the positioning hole. When in use, the above-mentioned drainage sand receiving device is placed directly below the ladle water inlet, the ladle slide is opened, and the ladle drainage sand flows out. At the moment the molten steel flows out of the water inlet, the drainage sand receiving device is quickly removed, thereby realizing the discharge control of the drainage sand during the continuous casting ladle pouring process and avoiding the contamination of the molten steel by the drainage sand. Although the above-mentioned device can recycle the drainage sand through the uncovered inverted cone-shaped iron shell, the molten steel has already flowed out when the drainage sand receiving device is removed. When the drainage sand receiving device is removed, the drainage sand receiving device will inevitably pass through the molten steel flow, causing the molten steel to splash, which is easy to cause danger and cause the drainage sand receiving device to burn, increasing the subsequent cleaning work of the drainage sand receiving device and the separation of the drainage sand and steel slag. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned problems and provides a continuous casting ladle drainage sand discharge device and its use method. The present invention utilizes an annular left-connected sand trough, an annular right-connected sand trough, and a drainage cone to cooperate with each other to achieve effective recovery of drainage sand without affecting the normal fall of molten steel, thereby preventing the molten steel from contacting the annular left-connected sand trough and the annular right-connected sand trough. After the drainage sand is recovered, the annular left-connected sand trough and the annular right-connected sand trough are separated to the opposite sides of the molten steel flow by a separation mechanism, thereby preventing the annular left-connected sand trough and the annular right-connected sand trough from contacting the molten steel during movement and causing splashing, thereby improving safety.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solution: a device for discharging drainage sand from a continuous casting ladle, comprising an annular left-connected sand trough, an annular right-connected sand trough, a drainage cone and a separation mechanism;

[0006] The annular left-connected sand trough is provided with a first sand holding cavity along the circumference, and the annular right-connected sand trough is provided with a second sand holding cavity along the circumference. The annular left-connected sand trough and the annular right-connected sand trough are combined with each other to form a complete ring, and the inner hole of the complete ring serves as a molten steel channel;

[0007] The diversion cone is arranged at the upper end of the molten steel channel;

[0008] The annular left-connected sand trough and the annular right-connected sand trough are arranged on a separation mechanism so as to be movable left and right. The separation mechanism is used to control the left and right movements of the annular left-connected sand trough and the annular right-connected sand trough to realize the combination and separation of the two.

[0009] The present invention also provides a technical solution in which the annular left-connected sand trough is provided with an annular left baffle at the upper end of the outer wall of the first sand holding chamber, and the annular right-connected sand trough is provided with an annular right baffle at the upper end of the outer wall of the second sand holding chamber. To ensure that the drainage sand slides completely from the drainage cone surface into the first and second sand holding chambers, the annular left baffle is provided at the upper end of the outer wall of the first sand holding chamber, and the annular right baffle is provided at the upper end of the outer wall of the second sand holding chamber. These baffles are used to block splashing drainage sand during the sliding process, thereby preventing the drainage sand from falling into the tundish.

[0010] The present invention also provides a technical solution in which the lower end surface of the diversion cone is provided with an embedded ring that matches the inner diameter of the molten steel channel, and the diversion cone is inserted into the molten steel channel via the embedded ring. To facilitate the fixation of the diversion cone, the embedded ring is provided on the lower end surface of the diversion cone, matching the inner diameter of the molten steel channel. This allows the diversion cone to be quickly inserted into the molten steel channel via the embedded ring without affecting the separation of the annular left-connecting sand trough and the annular right-connecting sand trough.

[0011] The present invention also provides a technical solution in which the molten steel channel is a tapered hole with a larger inner diameter at the top and a smaller inner diameter at the bottom. To prevent unstable molten steel flow and splashing, the molten steel channel is configured as a tapered hole with a larger inner diameter at the top and a smaller inner diameter at the bottom. This provides a certain degree of buffering and drainage for the molten steel when it flows onto the sidewalls of the channel.

[0012] The present invention also provides a technical solution in which a first refractory layer is provided on the outer wall of the annular left sand trough on the side of the molten steel channel, and a second refractory layer is provided on the outer wall of the annular right sand trough on the side of the molten steel channel. To improve the service life of the annular left and right sand troughs and the molten steel channel's resistance to molten steel impact, the first refractory layer is provided on the outer wall of the annular left sand trough on the side of the molten steel channel, and the second refractory layer is provided on the outer wall of the annular right sand trough on the side of the molten steel channel. Even if molten steel falls onto the outer walls of the annular left and right sand troughs on the side of the molten steel channel, it will not cause burns.

[0013] The technical solution of the present invention is as follows: the separation mechanism includes a first clamping rod and a second clamping rod hinged to each other, and the ends of the first clamping rod and the second clamping rod are respectively fixed with an annular left sand groove and an annular right sand groove arranged oppositely.

[0014] The technical solution of the present invention further includes a moving device for moving the position and adjusting the height of the separation mechanism. To facilitate the recovery of drainage sand, the annular left and right sand troughs can be more accurately moved to appropriate positions below the ladle nozzle. The separation mechanism is mounted on the moving device, and the moving device is used to move the position and adjust the height of the separation mechanism.

[0015] The present invention also provides a technical solution: the moving device includes a rotating link, a rotating shaft, and a lifting bracket, the separating mechanism being disposed at one end of the rotating link, the other end of which is hinged to the lifting bracket via the rotating shaft. By disposing the separating mechanism at one end of the rotating link and then hingedly connecting the other end of the rotating link to the lifting bracket via the rotating shaft, the connecting rod structure enables adjustment of the separating mechanism's left, right, front, and back positions, resulting in a simple structure. Furthermore, the lifting bracket allows adjustment of the separating mechanism's height.

[0016] The technical solution of the present invention is as follows: a first sand unloading plate is provided at the bottom of the annular left-connected sand trough, one end of the first sand unloading plate is hinged to the annular left-connected sand trough, and the other end of the first sand unloading plate is connected to the annular left-connected sand trough by a fastener;

[0017] A second sand discharge plate is provided at the bottom of the annular right sand trough, one end of which is hinged to the annular right sand trough, and the other end of which is connected to the annular right sand trough via a fastener. To facilitate the removal of recovered drainage sand from the annular left and right sand troughs, a first sand discharge plate is provided at the bottom of the annular left sand trough and a second sand discharge plate is provided at the bottom of the annular right sand trough. The first and second sand discharge plates are opened and closed by fasteners, thereby achieving rapid recovery and cleaning of the drainage sand in the annular left and right sand troughs.

[0018] The present invention also discloses a method for using the continuous casting ladle sand discharge device, comprising the following steps:

[0019] S1. Use the separation mechanism to combine the annular left-connected sand trough and the annular right-connected sand trough into a complete ring, and then set a drainage cone at the upper end of the molten steel channel;

[0020] S2. Move the sand drainage device of the continuous casting ladle between the ladle and the tundish so that the molten steel channel is located directly below the ladle outlet;

[0021] S3. Open the drain port of the ladle, and the drainage sand enters the first sand holding chamber and the second sand holding chamber under the guidance of the drainage cone;

[0022] S4. When the drainage sand is exhausted, the drainage cone will melt under the high temperature of the molten steel and flow into the tundish along with the molten steel through the molten steel channel;

[0023] S5. While the molten steel flows down, the separation mechanism is used to separate the annular left sand trough and the annular right sand trough on both sides relative to the steel flow direction, and then the annular left sand trough and the annular right sand trough are moved away from above the tundish, thereby realizing the recovery of the drainage sand.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention utilizes a full-ring inner hole formed by the combination of an annular left-connected sand trough and an annular right-connected sand trough as the molten steel channel for its descent, with a diversion cone positioned at the upper end of the channel. As the diversion sand falls, the diversion cone acts to allow it to fall into the first and second sand holding chambers below, enabling recovery. When the molten steel contacts the diversion cone, the high temperature causes it to melt and flow along with the molten steel from the channel into the tundish below, preventing damage to the discharge device caused by contact between the molten steel and the annular left and right sand troughs.

[0026] After the recovery of the drainage sand is completed, the annular left sand trough and the annular right sand trough are separated to both sides of the molten steel flow through the separation mechanism, which can effectively avoid the annular left sand trough and the annular right sand trough from contacting with the molten steel during the movement when the external discharge device is recovered, thereby increasing the service life of the external discharge device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of the continuous casting ladle sand discharge device of the present invention;

[0028] Figure 2 A three-dimensional diagram of the device for discharging drainage sand from a continuous casting ladle according to the present invention;

[0029] Figure 3This is a schematic diagram of the working state of the continuous casting ladle sand discharge device of the present invention;

[0030] In the picture: 400 steel ladle, 500 tundish;

[0031] 1 annular left-connected sand trough, 2 annular right-connected sand trough, 3 drainage cone, 31 embedded ring;

[0032] 100 first sand holding chamber, 200 second sand holding chamber, 300 molten steel channel;

[0033] 11 annular left baffle, 12 first refractory layer, 13 first sand discharge plate;

[0034] 21 annular right baffle, 22 second refractory layer, 23 second sand discharge plate;

[0035] 4 first clamping rod, 5 second clamping rod, 6 rotating connecting rod, 7 rotating shaft, 8 lifting bracket. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] like Figure 1 and Figure 2 As shown, a continuous casting ladle drainage sand discharge device includes an annular left-connected sand trough 1, an annular right-connected sand trough 2, a drainage cone 3 and a separation mechanism.

[0038] The annular left-connected sand trough 1 is circumferentially provided with a first sand containing cavity 100 opening upward, and the annular right-connected sand trough 2 is circumferentially provided with a second sand containing cavity 200 opening upward. The annular left-connected sand trough 1 and the annular right-connected sand trough 2 are combined with each other to form a complete ring, and the inner hole of the complete ring serves as a molten steel channel 300.

[0039] The diversion cone 3 is arranged at the upper end of the molten steel channel 300. The outer diameter of the lower end surface of the diversion cone 3 is larger than the inner diameter of the molten steel channel 300. The diversion cone 3 is made of a rigid high-temperature resistant material with a melting point lower than that of molten steel. The material of the diversion cone 3 is iron sheet or cardboard.

[0040] The annular left-connected sand trough 1 and the annular right-connected sand trough 2 are arranged on a separation mechanism so as to be movable left and right. The separation mechanism is used to control the left and right movement of the annular left-connected sand trough 1 and the annular right-connected sand trough 2 to realize the combination and separation of the two.

[0041] The annular left-connected sand trough 1 is provided with an annular left baffle 11 at the upper end of the outer wall of the first sand holding chamber 100 , and the annular right-connected sand trough 2 is provided with an annular right baffle 21 at the upper end of the outer wall of the second sand holding chamber 200 .

[0042] The lower end surface of the guide cone 3 is provided with an embedded ring 31 that matches the inner diameter of the molten steel channel 300 , and the guide cone 3 is inserted into the molten steel channel 300 through the embedded ring 31 .

[0043] The molten steel channel 300 is a tapered hole with a larger inner diameter at the top and a smaller inner diameter at the bottom.

[0044] A first refractory layer 12 is provided on the outer wall of the annular left-connected sand trough 1 located on the side of the molten steel channel 300 , and a second refractory layer 22 is provided on the outer wall of the annular right-connected sand trough 2 located on the side of the molten steel channel 300 .

[0045] Among them, Figure 2 As shown, the separation mechanism includes a first clamping rod 4 and a second clamping rod 5 that are hinged to each other. The ends of the first clamping rod 4 and the second clamping rod 5 are respectively fixed with an oppositely disposed annular left sand trough 1 and annular right sand trough 2. The other ends of the first clamping rod 4 and the second clamping rod 5 are provided with operating handles.

[0046] The continuous casting ladle sand discharge device also includes a moving device, which is used to move the position of the separation mechanism and adjust the height of the separation mechanism. The hinge axis of the first clamping rod 4 and the second clamping rod 5 is set on the moving device.

[0047] Specifically, such as Figure 2 As shown, the moving device includes a rotating link 6, a rotating shaft 7 and a lifting bracket 8. The hinge axis of the first clamping rod 4 and the second clamping rod 5 is set at one end of the rotating link 6. The hinge axis of the first clamping rod 4 and the second clamping rod 5 is threadedly connected to the rotating link 6. The other end of the rotating link 6 is hinged to the lifting bracket 8 through the rotating shaft 7. The lifting bracket 8 includes a hydraulic lifting rod, which connects the hinge axis of the first clamping rod 4 and the second clamping rod 5 to the piston rod of the hydraulic lifting rod, and uses the hydraulic lifting rod to control the lifting and lowering of the separation mechanism. Figure 2 As shown, in order to ensure the stability of the separation mechanism, a rotating tray is provided below the hinge axis of the first clamping rod 4 and the second clamping rod 5 to support the first clamping rod 4 and the second clamping rod 5 .

[0048] A first sand unloading plate 13 is provided at the bottom of the annular left-connected sand trough 1 , one end of the first sand unloading plate 13 is hinged to the annular left-connected sand trough 1 , and the other end of the first sand unloading plate 13 is connected to the annular left-connected sand trough 1 through a fastener.

[0049] A second sand discharge plate 23 is provided at the bottom of the annular right-connected sand trough 2. One end of the second sand discharge plate 23 is hinged to the annular right-connected sand trough 2, and the other end of the second sand discharge plate 23 is connected to the annular right-connected sand trough 2 via a fastener. The fastener can be a screw or bolt, or a pin or a snap-fit ​​structure, so as to quickly open and close the first sand discharge plate 13 and the second sand discharge plate 23.

[0050] The moving device in the present invention may also be a lifting trolley, and the separation mechanism may also be a clamping claw to achieve the combination and separation of the annular left-connected sand trough 1 and the annular right-connected sand trough 2.

[0051] A method for using the above-mentioned continuous casting ladle sand discharge device comprises the following steps:

[0052] S1. Use a separation mechanism to combine the annular left-connected sand trough 1 and the annular right-connected sand trough 2 into a complete ring, and then set a drainage cone 3 at the upper end of the molten steel channel 300.

[0053] S2, such as Figure 3 As shown, the continuous casting ladle sand discharge device is moved between the ladle 400 and the tundish 500 so that the molten steel channel 300 is located directly below the lower water port of the ladle 400.

[0054] S3. The drain port of the ladle 400 is opened, and the drainage sand enters the first sand holding chamber 100 and the second sand holding chamber 200 under the guidance of the drainage cone 3.

[0055] S4. After the drainage sand is completely drained, the drainage cone 3 will melt under the high temperature of the molten steel and flow into the tundish 500 along with the molten steel through the molten steel channel 300.

[0056] S5. While the molten steel flows down, the separation mechanism is used to separate the annular left-connected sand trough 1 and the annular right-connected sand trough 2 from both sides of the steel flow direction, and then the annular left-connected sand trough 1 and the annular right-connected sand trough 2 are moved away from above the tundish 500, thereby realizing the recovery of the drainage sand.

Claims

1. A device for discharging drainage sand from a continuous casting ladle, characterized by: It comprises an annular left-connected sand trough (1), an annular right-connected sand trough (2), a drainage cone (3) and a separation mechanism; The annular left-connected sand trough (1) is provided with a first sand containing cavity (100) along the circumference, and the annular right-connected sand trough (2) is provided with a second sand containing cavity (200) along the circumference. The annular left-connected sand trough (1) and the annular right-connected sand trough (2) are combined into a complete ring, and the inner hole of the complete ring serves as a molten steel channel (300); The diversion cone (3) is arranged at the upper end of the molten steel channel (300); The annular left-connected sand trough (1) and the annular right-connected sand trough (2) are arranged on a separation mechanism so as to be movable left and right. The separation mechanism is used to control the left and right movements of the annular left-connected sand trough (1) and the annular right-connected sand trough (2) to achieve the combination and separation of the two. The annular left-connected sand trough (1) is provided with an annular left baffle (11) at the upper end of the outer wall of the first sand holding chamber (100), and the annular right-connected sand trough (2) is provided with an annular right baffle (21) at the upper end of the outer wall of the second sand holding chamber (200); The separation mechanism comprises a first clamping rod (4) and a second clamping rod (5) which are hinged to each other, and the ends of the first clamping rod (4) and the second clamping rod (5) are respectively fixed with an annular left-connected sand trough (1) and an annular right-connected sand trough (2) which are arranged opposite to each other; The continuous casting ladle sand discharge device further comprises a moving device, which is used to move the position of the separation mechanism and adjust the height of the separation mechanism; The moving device comprises a rotating connecting rod (6), a rotating shaft (7) and a lifting bracket (8); the separation mechanism is arranged at one end of the rotating connecting rod (6); and the other end of the rotating connecting rod (6) is hinged to the lifting bracket (8) via the rotating shaft (7).

2. The continuous casting ladle sand discharge device according to claim 1, characterized in that: The lower end surface of the diversion cone (3) is provided with an embedded ring (31) matching the inner diameter of the molten steel channel (300), and the diversion cone (3) is inserted into the molten steel channel (300) through the embedded ring (31).

3. The continuous casting ladle sand discharge device according to claim 1, characterized in that: The molten steel channel (300) is a tapered hole with a larger inner diameter at the top and a smaller inner diameter at the bottom.

4. The continuous casting ladle sand discharge device according to claim 1, characterized in that: A first refractory layer (12) is provided on the outer wall of the annular left-connected sand trough (1) located on one side of the molten steel channel (300), and a second refractory layer (22) is provided on the outer wall of the annular right-connected sand trough (2) located on one side of the molten steel channel (300).

5. The continuous casting ladle sand discharge device according to claim 1, characterized in that: A first sand unloading plate (13) is provided at the bottom of the annular left-connected sand trough (1), one end of the first sand unloading plate (13) is hinged to the annular left-connected sand trough (1), and the other end of the first sand unloading plate (13) is connected to the annular left-connected sand trough (1) via a fastener; A second sand unloading plate (23) is provided at the bottom of the annular right-connected sand trough (2), one end of the second sand unloading plate (23) is hinged to the annular right-connected sand trough (2), and the other end of the second sand unloading plate (23) is connected to the annular right-connected sand trough (2) via a fastener.

6. A method for using the continuous casting ladle sand discharge device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Using a separation mechanism, the annular left-connected sand trough (1) and the annular right-connected sand trough (2) are combined into a complete ring, and then a drainage cone (3) is provided at the upper end of the molten steel channel (300); S2, moving the continuous casting ladle sand discharge device to between the ladle (400) and the tundish (500), so that the molten steel channel (300) is located directly below the ladle (400) outlet; S3, opening the drain port of the ladle (400), and guiding the drainage sand into the first sand holding chamber (100) and the second sand holding chamber (200) under the guidance of the drainage cone (3); S4. After the drainage sand is completely drained, the drainage cone (3) melts under the high temperature of the molten steel and flows into the tundish (500) along with the molten steel through the molten steel channel (300); S5. While the molten steel flows downward, the annular left-connected sand trough (1) and the annular right-connected sand trough (2) are separated from each other on both sides relative to the steel flow direction by using a separation mechanism, and then the annular left-connected sand trough (1) and the annular right-connected sand trough (2) are moved away from above the tundish (500), thereby realizing the recovery of the drainage sand.

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