An automatic slag addition device for continuous casting

Abstract

This utility model belongs to the field of continuous casting production technology and discloses an automatic protective slag adding device for continuous casting. It includes a storage tank with a top cover assembly for feeding, stirring, and preventing agglomeration. A moving assembly is located below the storage tank to support its movement, and a feeding assembly is installed on the bottom of the storage tank for continuously conveying and distributing protective slag. The moving assembly includes a frame with four wheels evenly distributed at the four corners of its bottom. A drive mechanism providing power to move the frame is located at one end. The frame is fixedly connected to the storage tank via four support columns evenly distributed at the four corners of its top surface. The feeding assembly includes a discharge pipe with a distributing mechanism at its bottom for spreading the protective slag. This automatic protective slag adding device for continuous casting, through a dual homogenization mechanism of "horizontal + vertical," forms a three-dimensional slag distribution pattern, achieving extremely high-quality protective slag coverage.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical continuous casting production technology, and in particular relates to an automatic protective slag addition device for continuous casting. Background Technology

[0002] Continuous casting protective slag is a functional material placed on the surface of molten steel in the crystallizer during continuous casting. It achieves multiple metallurgical functions through a unique three-layer structure (liquid slag layer, sintered layer, and powdered slag layer). Its core functions include: heat insulation (the powdered slag layer reduces radiative heat loss from the molten steel, lowers superheat, maintains stable meniscus temperature, and prevents bridging or crusting); oxidation isolation (the liquid slag layer covers the molten steel surface, preventing air contact with the molten steel, preventing secondary oxidation and nitrogen absorption, and ensuring the cleanliness of the molten steel); lubrication and heat transfer regulation (the liquid slag penetrates into the gap between the billet shell and the crystallizer to form a slag film, reducing billet pulling resistance, and adjusting the heat transfer rate by the thickness of the slag film, preventing the billet shell from being too thin or too thick); and inclusion adsorption (the protective slag can dissolve non-metallic inclusions that float to the steel-slag interface, improving the purity of the molten steel). Therefore, when adding protective slag, the principles of frequent, small, and even addition should be followed to ensure that the protective slag fully functions.

[0003] Comparing with Chinese Patent No. CN223129294U, a device for adding protective slag in continuous casting of round billets is disclosed. The device includes a base, with U-shaped support rods symmetrically fixed to the top of the base. The support rods are connected to a hopper box via a lifting assembly. An agitating assembly is installed inside the hopper box. A feeding pipe is connected to the bottom of the hopper box via a conveying pipe, and the feeding pipe contains the adding assembly. In use, a first motor controls multiple agitating rods to rotate at a uniform speed via a rotating rod. These rods agitate the protective slag accumulated inside the hopper box and the conveying pipe, preventing slag blockage and allowing the protective slag in the conveying pipe to enter the feeding pipe normally, thus enabling proper adding of the protective slag.

[0004] However, the aforementioned patent can only spread the protective slag at fixed points, making it difficult to spread it evenly on the surface of the molten metal. It is easy to pile up and cause local areas to be too thick or too thin, which seriously reduces the quality of the protective slag filling and covering. Therefore, a new device needs to be designed. Utility Model Content

[0005] The purpose of this invention is to provide an automatic protective slag addition device for continuous casting, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An automatic protective slag adding device for continuous casting includes a storage tank. A top cover assembly for feeding, stirring, and preventing agglomeration is installed on the top of the storage tank. A moving assembly for supporting movement is located below the storage tank. A feeding assembly for continuously conveying and distributing protective slag is installed on the bottom surface of the storage tank. The moving assembly includes a frame with four wheels evenly distributed at the four corners of its bottom. The wheels roll along two parallel limiting tracks. A drive mechanism providing moving power is located at one end of the frame. The frame is fixedly connected to the storage tank via four support columns evenly distributed at the four corners of its top surface. The feeding assembly includes a hopper bolted to the bottom surface of the storage tank. A conveying pipe is obliquely upward-facing in front of the hopper. A discharge pipe is located at the top of the conveying pipe. A third motor is installed at the top of the conveying pipe, and a spiral conveying rod is installed at the output end of the third motor. A distributing mechanism for spreading protective slag is located at the bottom of the discharge pipe.

[0007] Furthermore: the drive mechanism includes a support shaft disposed between the two traveling wheels at the same end of the traveling frame, a gear reducer disposed in the middle of the support shaft, a second motor disposed on the gear reducer, the second motor being fixedly mounted on the traveling frame and passing through the traveling frame and being keyed to the gear reducer.

[0008] Furthermore: the storage box is a rectangular box with an open top, and the bottom of the storage box is provided with a through hole.

[0009] Furthermore: the bulk material mechanism includes a rotating bulk material rack rotatably installed inside the discharge pipe, the surface of the rotating bulk material rack is covered with a bulk material net, a fourth motor is provided at one end of the rotating bulk material rack, the fourth motor is fixedly installed on the outside of the discharge pipe, and passes through the discharge pipe and is connected to the rotating bulk material rack with a key.

[0010] Furthermore, the rotating bulk material rack is a cylindrical structure consisting of several rods evenly distributed along the circumference between two parallel, vertically erected discs.

[0011] Furthermore: the upper cover assembly includes an upper cover plate, a feeding hopper is provided on the top of the upper cover plate, two first motors are symmetrically mounted on the upper cover plate, a drive shaft is installed at the output end of the first motor, and several stirring blades are circumferentially mounted on the bottom of the drive shaft.

[0012] Furthermore: the two first motors rotate relative to each other.

[0013] Compared with existing technologies, the beneficial effects are: The traveling component drives the entire device to reciprocate at a constant speed along the limiting tracks on both sides of the crystallizer, ensuring that the protective slag is evenly covered along the length of the molten metal surface. The rotation of the rotating material rack and the material net disperses the falling protective slag flow, changing its trajectory and ensuring that it is evenly distributed along the width of the molten metal surface, avoiding stacking and local over- or under-thickness. This dual homogenization mechanism of "horizontal + vertical" forms a three-dimensional slag distribution mode, which can achieve extremely high-quality protective slag coverage and form a slag layer of uniform thickness. This more effectively isolates air, prevents steel oxidation, and maintains heat, ultimately improving the surface and internal quality of the continuously cast billet, and realizing a fully automatic slag addition operation with high quality, high efficiency, and high stability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an automatic protective slag addition device for continuous casting as described in this utility model; Figure 2 This is a top-view axonometric drawing of the walking component of an automatic continuous casting protective slag adding device described in this utility model; Figure 3 This is a bottom-view axonometric drawing of the walking component of an automatic continuous casting protective slag adding device described in this utility model; Figure 4 This is a schematic diagram of the upper cover assembly of an automatic protective slag addition device for continuous casting as described in this utility model; Figure 5 This is a schematic diagram of the feeding component of an automatic protective slag feeding device for continuous casting as described in this utility model; Figure 6 This is a right perspective view of the feeding component of the automatic protective slag feeding device for continuous casting described in this utility model; Figure 7 This is a schematic diagram of the bulk material mechanism of an automatic protective slag adding device for continuous casting as described in this utility model.

[0015] In the attached diagram, the following are the reference numerals: 101, walking frame; 102, support column; 103, gear reducer; 104, support shaft; 105, walking wheel; 106, limit track; 107, second motor; 201, upper cover plate; 202, feed hopper; 203, first motor; 204, drive shaft; 205, stirring blade; 301, collection hopper; 302, conveying pipe; 303, discharge pipe; 304, third motor; 305, screw conveyor rod; 306, fourth motor; 307, rotating bulk material rack; 308, bulk material net; 4, storage box; 5, through hole. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-7 An automatic protective slag addition device for continuous casting includes a storage tank 4, with a top cover assembly for feeding, stirring and preventing agglomeration installed on the top of the storage tank 4, a walking assembly for supporting and moving the storage tank 4 below, and a feeding assembly for continuously conveying and dispersing protective slag on the bottom surface of the storage tank 4.

[0018] In this embodiment: the storage box 4 is a rectangular box with an open top, and the bottom of the storage box 4 is provided with a through hole 5; the upper cover assembly includes an upper cover plate 201, the top of the upper cover plate 201 is provided with a feeding hopper 202, two first motors 203 are symmetrically installed on the upper cover plate 201, a drive shaft 204 is installed at the output end of the first motor 203, and several stirring blades 205 are circumferentially installed at the bottom of the drive shaft 204; the two first motors 203 rotate relative to each other; the protective slag is poured from the feeding hopper 202 into the storage box 4, the upper cover plate 201 supports the first motors 203 to drive the drive shaft 204 to drive the stirring blades 205 to rotate, stir the protective slag in the storage box 4 and push it to the middle, so that the protective slag passes through the through hole 5 at the bottom of the storage box 4 and falls into the collection hopper 301; In this embodiment: the walking assembly includes a walking frame 101, with four walking wheels 105 evenly distributed at the four corners of the bottom of the walking frame 101. The walking wheels 105 roll along two parallel limiting tracks 106. A drive mechanism for providing walking power is provided at one end of the walking frame 101. The walking frame 101 is fixedly connected to the storage box 4 through four support columns 102 evenly distributed at the four corners of the top surface. The drive mechanism includes a support shaft 104 disposed between two walking wheels 105 at the same end of the walking frame 101, with a gear reducer 1 disposed in the middle of the support shaft 104. 03. A second motor 107 is installed on the gear reducer 103. The second motor 107 is fixedly installed on the walking frame 101 and passes through the walking frame 101 and is connected to the gear reducer 103 by a key. The walking frame 101 supports the second motor 107 to rotate forward and backward. After the gear reducer 103 reduces the speed and increases the torque, it drives the support shaft 104 to drive the walking wheel 105 to rotate and roll along the limit track 106. This causes the storage box 4 and the feeding assembly fixed on the support column 102 on the walking frame 101 to move back and forth, so as to evenly spread the protective slag on the surface of the molten metal. In this embodiment: the feeding assembly includes a hopper 301 bolted to the bottom of the storage box 4. A conveying pipe 302 is obliquely upwardly arranged in front of the hopper 301. A discharge pipe 303 is arranged at the top of the conveying pipe 302. A third motor 304 is installed at the top of the conveying pipe 302. A spiral conveying rod 305 is installed at the output end of the third motor 304. A material dispersing mechanism for spreading protective slag is arranged at the bottom of the discharge pipe 303. The material dispersing mechanism includes a rotating material dispersing frame 307 rotatably installed inside the discharge pipe 303. The surface of the rotating material dispersing frame 307 is covered with a material dispersing net 308. A fourth motor 306 is arranged at one end of the rotating material dispersing frame 307. The fourth motor 306 is fixedly installed on the outside of the discharge pipe 303 and passes through the discharge pipe 303 and the rotating material dispersing frame 307. 07. Parallel key connection; The rotating bulk material rack 307 is a cylindrical structure with several rods evenly distributed around the circumference between two parallel vertical discs; The protective slag falls into the collection hopper 301, and the conveying pipe 302 supports the third motor 304 to drive the spiral conveying rod 305 to rotate, pushing the protective slag in the collection hopper 301 to move upward along the conveying pipe 302 and be discharged from the top discharge pipe 303. At the same time, the discharge pipe 303 supports the fourth motor 306 to drive the rotating bulk material rack 307 to rotate, so that the protective slag falling along the discharge pipe 303, under the action of the rotation of the bulk material net 308, part of it passes through the bulk material net 308 and falls directly out of the discharge pipe 303, and the other part is changed in direction by the bulk material net 308 and falls out of the discharge pipe 303, so as to achieve the uniform distribution of the protective slag.

[0019] Working principle: The protective slag is poured from the feed hopper 202 into the storage box 4. The upper cover plate 201 supports the first motor 203, which drives the transmission shaft 204 to rotate the stirring blade 205, stirring the protective slag in the storage box 4 and pushing it towards the center. The protective slag then passes through the through hole 5 at the bottom of the storage box 4 and falls into the collecting hopper 301. The conveying pipe 302 supports the third motor 304, which drives the screw conveyor 305 to rotate, pushing the protective slag in the collecting hopper 301 to move upwards along the conveying pipe 302 and out through the discharge pipe 303 at the top. At the same time, the discharge pipe 303 supports the fourth motor 306, which drives the rotating material distribution frame 307 to rotate, causing the protective slag to move upwards along the conveying pipe 302 and out through the discharge pipe 303 at the top. The protective slag falling from the discharge pipe 303, under the rotation of the loose material net 308, part of it passes through the loose material net 308 and falls directly out of the discharge pipe 303, while the other part is changed in direction by the loose material net 308 and falls out of the discharge pipe 303, thus achieving uniform distribution of the protective slag. In addition, the walking frame 101 supports the second motor 107 to rotate forward and backward. After the gear reducer 103 reduces the speed and increases the torque, it drives the support shaft 104 to drive the walking wheel 105 to rotate and roll along the limit track 106. This causes the storage box 4 and the feeding component fixed on the support column 102 on the walking frame 101 to move back and forth, so as to evenly spread the protective slag on the surface of the molten metal.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic slag-adding device for continuous casting, comprising a storage tank (4), wherein the top of the storage tank (4) is equipped with a top cover assembly for feeding, stirring, and preventing agglomeration, characterized in that: It also includes a walking component for supporting movement provided below the storage tank (4), and a feeding component for continuously conveying and dispersing protective slag installed on the bottom surface of the storage tank (4); The walking assembly includes a walking frame (101), and four walking wheels (105) are evenly distributed at the four corners of the bottom of the walking frame (101). The walking wheels (105) roll along two parallel limiting tracks (106). One end of the walking frame (101) is provided with a drive mechanism for providing walking power. The walking frame (101) is fixedly connected to the storage box (4) through four support columns (102) evenly distributed at the four corners of the top surface. The feeding assembly includes a hopper (301) bolted to the bottom of the storage box (4). A conveying pipe (302) is obliquely upward in front of the hopper (301). A discharge pipe (303) is arranged at the top of the conveying pipe (302) in a certain direction. A third motor (304) is installed at the top of the conveying pipe (302). A spiral conveying rod (305) is installed at the output end of the third motor (304). A material dispersing mechanism for spreading protective slag is provided at the bottom of the discharge pipe (303).

2. The automatic protective slag addition device for continuous casting according to claim 1, characterized in that: The drive mechanism includes a support shaft (104) disposed between two walking wheels (105) at the same end of the walking frame (101). A gear reducer (103) is disposed in the middle of the support shaft (104). A second motor (107) is disposed on the gear reducer (103). The second motor (107) is fixedly mounted on the walking frame (101) and passes through the walking frame (101) and is connected to the gear reducer (103) by a key.

3. The automatic protective slag addition device for continuous casting according to claim 2, characterized in that: The storage box (4) is a rectangular box with an open top, and the bottom of the storage box (4) is provided with a through hole (5).

4. The automatic protective slag addition device for continuous casting according to claim 1, characterized in that: The bulk material mechanism includes a rotating bulk material rack (307) rotatably installed inside the discharge pipe (303). The surface of the rotating bulk material rack (307) is covered with a bulk material net (308). A fourth motor (306) is provided at one end of the rotating bulk material rack (307). The fourth motor (306) is fixedly installed on the outside of the discharge pipe (303) and passes through the discharge pipe (303) and is connected to the rotating bulk material rack (307) with a key.

5. The automatic slag addition device for continuous casting according to claim 4, characterized in that: The rotating bulk material rack (307) is a cylindrical structure with several rods evenly distributed along the circumference between two parallel vertical discs.

6. The automatic protective slag addition device for continuous casting according to claim 1, characterized in that: The upper cover assembly includes an upper cover plate (201), a feed hopper (202) is provided on the top of the upper cover plate (201), two first motors (203) are symmetrically installed on the upper cover plate (201), a drive shaft (204) is installed at the output end of the first motor (203), and several stirring blades (205) are circumferentially installed at the bottom of the drive shaft (204).

7. The automatic protective slag addition device for continuous casting according to claim 6, characterized in that: The two first motors (203) rotate relative to each other.

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