Automatic sand filling device for electric arc furnace

Abstract

The utility model discloses an automatic sand filling device for an electric arc furnace. Comprising a fixed base, a rotating arm and a sand filling hopper, the rotating arm is connected to the fixed base in a sleeving mode, the sand filling hopper is connected to the rotating arm, an opening and closing valve plate is hinged to a sand outlet of the sand filling hopper, and the opening and closing valve plate is connected with an opening and closing driving unit, so that a closing position for blocking the sand outlet and a sand outlet position far away from the sand outlet are achieved; the opening and closing driving unit is arranged on the side wall of the sand filling hopper, and the rotating arm is connected with a rotating driving unit used for driving the sand filling hopper to be switched between the standby position and the working position. The sand filling hopper is switched between the standby position and the working position through the rotary driving unit, the opening and closing valve plate is hinged to the sand outlet of the sand filling hopper, opening and closing of the opening and closing valve plate are achieved through the opening and closing driving unit, the needed action space is small, interference to other equipment is avoided, and manual operation can be reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of metallurgical industry, and in particular to an automatic sand filling device for electric arc furnace. Background Technology

[0002] Modern electric arc furnace (EAF) steelmaking plants generally adopt a short-process production line integrating EAF, refining, and continuous casting. The EAF uses eccentric bottom tapping technology (EBT) to achieve slag-free tapping. During EBT tapping, the cradle tilts forward towards the tapping side, opening the tapping mechanism. The tapping port filler automatically falls under the static pressure of the molten steel, allowing the molten steel to flow into the ladle. After tapping, the furnace is straightened, the tapping mechanism is closed, and sand and scrap steel need to be added to the tapping port for re-ignition and remelting. The EAF sand-filling device is a piece of equipment used to fill the tapping port with sand. Currently, most EAF sand-filling devices are operated manually, and the opening and closing of the sand hopper outlet is also done manually. However, this method presents safety hazards due to high operating temperatures, strong heat radiation, significant dust and noise pollution, and high labor intensity. For example, patent CN 217377940 U discloses a rotary electric furnace sand filling device. The sand filling hopper rotates on a fixed base via a rotating arm. When it rotates above the steel tapping port, the operator manually rotates the operating handle to fill the sand. The opening and closing of the sand tapping port is also manually operated. This operation method requires a relatively large working space and is prone to interference with other equipment on site. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides an automatic sand-filling device for an electric arc furnace, comprising a fixed base, a rotating arm, and a sand-filling hopper. The rotating arm is sleeved on the fixed base and can rotate horizontally around the fixed base. The sand-filling hopper is connected to the rotating arm, and an opening / closing valve plate is configured on the sand outlet of the sand-filling hopper. The opening / closing valve plate is hinged to the sand-filling hopper, and the opening / closing valve plate is connected to an opening / closing drive unit, thereby having a closed position that blocks the sand outlet and a sand-discharging position away from the sand outlet. The opening / closing drive unit is disposed on the side wall of the sand-filling hopper, and the rotating arm is connected to a rotary drive unit for switching the sand-filling hopper between a standby position away from the steel tapping outlet and a working position located above the steel tapping outlet.

[0004] Furthermore, the rotary drive unit is interlocked with the opening and closing drive unit.

[0005] Furthermore, the hinge point between the opening / closing valve plate and the sand filling hopper is located on the side of the sand filling hopper closer to the opening / closing drive unit.

[0006] Furthermore, the end face of the sand outlet has an included angle with the cross-section of the sand filling hopper, the opening and closing drive unit is located on the side of the sand outlet of the sand filling hopper at a height, and the output end of the opening and closing drive unit is hinged to the bottom of the opening and closing valve plate.

[0007] Furthermore, the end face of the sand outlet is a plane, or the end face of the sand outlet is an arc-shaped surface.

[0008] Furthermore, the opening and closing valve plate includes a side plate and a bottom plate adapted to the end face of the sand outlet. The side plate is connected to the bottom plate, and the end of the side plate away from the bottom plate is hinged to the sand filling hopper. The side plate is located outside the sand filling hopper, and the bottom plate is connected to the opening and closing drive unit. When the sand outlet position is reached, part of the bottom plate is located outside the side wall of the sand filling hopper.

[0009] Furthermore, the base plate includes a first base plate segment and a second base plate segment, which are connected. The surfaces of the first and second base plate segments are both perpendicular to the surfaces of the side plates, and there is an angle between the surfaces of the first and second base plate segments. The sand outlet includes a first sand outlet end face and a second sand outlet end face. The opening and closing valve plate is in the closed position. The first sand outlet end face is correspondingly arranged with the first base plate segment, and the second sand outlet end face is correspondingly arranged with the second base plate segment.

[0010] Furthermore, a mounting bracket is provided on the side wall of the sand filling hopper, the opening and closing drive unit is hinged to the mounting bracket, and the output end of the opening and closing drive unit is hinged to the opening and closing valve plate.

[0011] Furthermore, it also includes a mounting base, on which the rotary drive unit is disposed, and the output end of the rotary drive unit is hinged to the rotating arm.

[0012] Furthermore, the fixed base is provided with a fixed shaft on its upper part, and the end of the rotating arm is provided with a rotating shaft mounting hole, which is rotatably connected to the fixed shaft.

[0013] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0014] 1) The automatic sand filling device for electric arc furnace provided by this utility model has a sand filling hopper that switches between standby and working positions via a rotary drive unit. A valve plate is hinged to the sand outlet of the sand filling hopper. The valve plate is opened and closed by the opening and closing drive unit. The required working space is small, which avoids interference with other equipment and reduces manual operation.

[0015] 2) The automatic sand filling device for electric arc furnace provided by this utility model has an interlocked rotary drive unit and an opening and closing drive unit. After the sand filling hopper is rotated into place, the opening and closing valve plate is opened to carry out the sand filling operation, thus avoiding the occurrence of misoperation.

[0016] 3) The automatic sand filling device for electric arc furnace provided by this utility model has a valve plate hinged to the sand filling hopper. The valve plate is driven by the opening and closing drive unit, which can be installed on the side wall of the sand filling hopper, away from the steel outlet, to avoid heat radiation from the steel outlet and extend the service life of the opening and closing drive unit.

[0017] 4) The automatic sand filling device for electric arc furnace provided by this utility model has a sand filling hopper that is rotatably mounted on a fixed base via a rotating arm, and a rotary drive unit that is hinged to the rotating arm. This can effectively reduce the driving force of rotation and lower the requirements for the rotary drive unit.

[0018] 5) The automatic sand filling device for electric arc furnace provided by this utility model has a simple structure, is easy and reliable to operate, occupies little space, and has wide applicability. It can be used in conjunction with various types of electric arc furnaces. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the automatic sand-filling device for electric arc furnace provided by this utility model;

[0021] Figure 2 The front view of the opening and closing valve plate in the automatic sand filling device for electric arc furnace provided by this utility model.

[0022] Figure 3 A top view of the opening and closing valve plate in the automatic sand filling device for electric arc furnace provided by this utility model;

[0023] Figure 4 Top view of the automatic sand-filling device for electric arc furnace provided by this utility model;

[0024] Figure 5 This is a schematic diagram of the installation of the rotary drive unit in the automatic sand filling device for electric arc furnace provided by this utility model.

[0025] 1-Base; 2-Fixed base; 21-Fixed shaft; 22-Shaft end baffle; 3-Rotating arm; 31-Rotating shaft mounting hole; 4-Rotation drive unit; 41-Mounting seat; 42-Spherical single-ear connecting rod; 5-Sand filling hopper; 51-Sand hopper body; 52-Discharge hopper; 53-Sand outlet; 6-Opening and closing valve plate; 61-Base plate; 62-Side plate; 7-Opening and closing drive unit; 71-Mounting bracket; 72-Bearing seat. Detailed Implementation

[0026] 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, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. In the accompanying drawings, the dimensions and relative dimensions of certain parts may be enlarged for clarity.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "connected" should be interpreted broadly. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] In the description of this utility model, the terms "upper", "lower", "left", "right", "front", "back", "center", "horizontal", "vertical", "top", "bottom", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, in the description of this utility model, the terms "first" and "second" are used merely for descriptive distinction and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Additionally, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0030] As per the instruction manual Figure 1 As shown, this utility model provides an automatic sand filling device for an electric arc furnace, including a fixed base 2, a rotating arm 3, and a sand filling hopper 5. The rotating arm 3 is sleeved on the fixed base 2 and can rotate horizontally around the fixed base 2. The sand filling hopper 5 is connected to the rotating arm 3. An opening and closing valve plate 6 is arranged on the sand outlet 53 of the sand filling hopper 5. The opening and closing valve plate 6 is hinged to the sand filling hopper 5. The opening and closing valve plate 6 is connected to an opening and closing drive unit 7, so that it has a closed position that blocks the sand outlet 53 and a sand outlet position away from the sand outlet 53. The opening and closing drive unit 7 is arranged on the side wall of the sand filling hopper 5. The rotating arm 3 is connected to a rotary drive unit 4 for driving the sand filling hopper 5 to switch between a standby position away from the steel outlet and a working position above the steel outlet.

[0031] Specifically, to prevent the sand filling hopper 5 from being positioned above the steel outlet regardless of whether it is operating, and to avoid the high temperature of the steel outlet affecting the equipment, the sand filling hopper 5 is designed as a rotating structure. When sand filling is not required, the sand filling hopper is moved away from the steel outlet. See the attached instruction manual for details. Figure 4 As shown, the rotating arm 3 is sleeved on the fixed base 2 and can rotate horizontally around the fixed base 2. The sand filling hopper 5 is connected to the rotating arm 3. The rotating arm 3 is connected to the rotary drive unit 4, so that the sand filling hopper 5 has a working position above the steel outlet and a standby position away from the steel outlet. The sand filling hopper 5 can perform sand replenishment operation in the standby position.

[0032] In an optimized implementation, the rotary drive unit 4 is interlocked with the opening and closing drive unit 7.

[0033] Specifically, the opening and closing drive unit 7 is a cylinder, and / or the rotary drive unit 4 is a cylinder. The sand filling device also includes a controller, and both the opening and closing drive unit 7 and the rotary drive unit 4 are electrically connected to the controller. The rotary drive unit 4 and the opening and closing drive unit 7 are interlocked. The rotary drive unit is equipped with a limit switch, which is electrically connected to the controller. The limit switch ensures that the rotary drive unit drives the rotating arm to rotate to the correct position. In use, after the rotary drive unit 4 drives the sand filling hopper 5 to the working position, the opening and closing drive unit 7 receives the opening signal and then opens the opening and closing valve plate 6 to perform the sand filling operation. This prevents the opening and closing valve plate 6 from malfunctioning when the sand filling hopper 5 is in other positions, ensuring that the material in the sand filling hopper 5 can be delivered to the target position.

[0034] Specifically, the fixed base 2 is mounted on the base 1 by bolts.

[0035] In an optimized implementation, the fixed base 2 has a fixed shaft 21 on its upper part, and the end of the rotating arm 3 has a rotating shaft mounting hole 31. The rotating shaft mounting hole 31 is sleeved on the fixed shaft 21, and the rotating shaft mounting hole 31 is rotatably connected to the fixed shaft 21. A sliding bushing is fitted between the fixed shaft 21 and the rotating shaft mounting hole 31, allowing the rotating arm 3 to rotate horizontally around the fixed base 2. A shaft end baffle 22 is locked above the rotating shaft mounting hole 31, and the shaft end baffle 22 is connected to the fixed shaft 21.

[0036] Optimized implementation methods, as shown in the appendix to the instruction manual. Figure 5 As shown, it also includes a mounting base 41, which is disposed on one side of the fixed base 2. The rotary drive unit 4 is disposed on the mounting base 41, and the output end of the rotary drive unit 4 is hinged to the rotating arm 3.

[0037] Specifically, the rotating arm is provided with a rotating hinge point A, and the rotating drive unit 4 is preferably a cylinder. The cylinder is connected to the mounting base 41, and the output end of the cylinder is connected to a spherical single-ear connecting rod 42, which is hinged to the rotating hinge point A. The cylinder can drive the rotating arm to rotate the sand filling hopper, thereby moving it closer to or away from the steel outlet.

[0038] The working principle of the sand filling device is as follows: after each steel tapping, when magnesium oxide is needed to fill the steel tapping channel, the sand filling device needs to swing from the standby position to the working position. At this time, the rotary cylinder receives the sand filling command and drives the rotating arm to swing the sand filling bucket to the working position. Then, the opening and closing drive unit drives the opening and closing valve plate to open and carry out the sand filling operation. After the sand filling is completed, the opening and closing valve plate is closed. Then, the rotary cylinder drives the sand filling bucket back to the standby position, and the sand loading machine automatically loads sand into the bucket to prepare for the next filling of the steel tapping port.

[0039] Specifically, the sand filling hopper 5 includes a sand hopper body 51 and a discharge hopper 52. The bottom of the sand hopper body 51 is provided with a conical part, and the discharge hopper 52 is connected to the conical part. The discharge hopper 52 is a square hopper, and the sand outlet 53 is located at the bottom of the discharge hopper 52. The sand outlet 53 is equipped with an opening and closing valve plate 6. When magnesia sand is needed to fill the steel tapping channel, the opening and closing drive unit 7 receives an instruction and drives the opening and closing valve plate 6 to move. The opening and closing valve plate 6 rotates around the hinge point, opening the valve plate. The magnesia sand in the sand filling hopper 5 falls under the action of gravity, completing the sand filling work. Driven by the opening and closing drive unit 7, the opening and closing valve plate 6 rotates in the opposite direction around the hinge point, closing the valve plate. Sand is replenished in the sand filling hopper 5, waiting for the next sand filling instruction. The opening and closing drive unit 7 is set on the side wall of the sand filling hopper 5, which can be far away from the steel tapping port to avoid heat radiation from the steel tapping port and extend the service life of the opening and closing drive unit 7.

[0040] Specifically, in order to facilitate the opening and closing drive unit 7 on the side wall of the sand filling hopper 5 to drive the opening and closing valve plate 6, the end face of the sand outlet 53 is inclined, and the two ends of the sand outlet 53 are at different heights, that is, there is a certain angle between the end face of the sand outlet 53 and the cross-section of the sand filling hopper 5, and the angle is an acute angle.

[0041] In some embodiments, the angle between the end face of the sand outlet 53 and the cross-section of the sand filling hopper 5 is 10 to 45°.

[0042] In an optimized implementation, the hinge point between the opening / closing valve plate 6 and the sand filling hopper 5 is located on the side of the sand filling hopper 5 closer to the opening / closing drive unit 7.

[0043] In an optimized implementation, the end face of the sand outlet 53 is either flat or curved. In this embodiment, the bottom of the front and rear walls of the hopper is curved near the right side, and the right side of the sand outlet is higher than the left side. The front and rear side walls of the hopper 52 are provided with mounting hinge holes B, and the opening and closing valve plate 6 is hinged to the mounting hinge holes B.

[0044] Furthermore, the opening and closing drive unit 7 is located on the higher side of the sand outlet 53 of the sand filling hopper 5, the mounting hinge hole B is located near the right side of the discharge hopper 52, and the output end of the opening and closing drive unit 7 is hinged to the bottom of the opening and closing valve plate 6.

[0045] Optimized implementation methods, as shown in the appendix to the instruction manual. Figure 2 and 3 The diagram shows the structure of the opening / closing valve plate 6. The valve plate 6 includes side plates 62 and a base plate 61 adapted to the sand outlet 53. The shape of the base plate 61 is set according to the contour of the sand outlet of the hopper 52 to facilitate sealing the sand outlet 53. The base plate 61 is adapted to the contour of the discharge port of the hopper 52. There are two side plates 62, which are respectively connected to the front and rear ends of the base plate 61. The end of the side plate 62 away from the base plate 61 is hinged to the sand filling hopper 5. The side plate 62 is located outside the sand filling hopper 5. The base plate 61 is connected to the opening / closing drive unit 7. When in the sand discharge position, part of the base plate 61 rotates to the outside of the side wall of the sand filling hopper 5. The end of the side plate 62 away from the base plate 61 is provided with a mounting hinge hole C1, which is hinged to the mounting hinge hole B of the hopper 52 by a pin. The bottom of the base plate 61 is provided with an extension, and the extension is provided with a mounting hinge hole C2, which is hinged to the output end of the opening and closing drive unit 7.

[0046] Specifically, the base plate 61 mates with the end face of the sand outlet 53 to seal the sand outlet 53. In this embodiment, the sand outlet 53 includes a first sand outlet end face on the right and a second sand outlet end face on the left. The first and second sand outlet end faces together constitute the sand outlet 53, and the first and second sand outlet end faces are continuous end faces. (See attached specification) Figure 2As shown, the base plate 61 includes a first base plate segment 611 and a second base plate segment 612, connected by a connection 612. The first and second base plate segments are continuous plates, and the surfaces of both the first and second base plate segments are perpendicular to the surface of the side plate 62. The surfaces of the first and second base plate segments 611 and 612 form an angle. When in the closed position, the first and second base plate segments 611 and 612 are inclined surfaces with different inclination angles. The inclination angle of the first base plate segment 611 is greater than that of the second base plate segment 612. The mounting hinge hole C1 of the side plate is located near the first base plate segment 611, and the mounting hinge hole C2 is located at the bottom of the first base plate segment 612. When the valve plate is in the closed position, the first base plate segment corresponds to and seals the first sand outlet end face, and the second base plate segment corresponds to and seals the second sand outlet end face. The base plate is composed of the first base plate segment and the second base plate segment, which facilitates rotation under power and occupies little space, improving the agility of opening and closing the valve plate; and when the valve plate is in the closed position, the base plate can better fit against the sand outlet, sealing the sand outlet.

[0047] In an optimized implementation, a mounting bracket 71 is provided on the conical part of the sand hopper body, and a bearing seat 72 is provided on the mounting bracket 71. The opening and closing drive unit 7 is disposed on the bearing seat 72. The opening and closing drive unit 7 can rotate on the mounting bracket 71 through the bearing seat 72. The output end of the opening and closing drive unit 7 is hinged to the mounting hinge hole C2 through a pin.

[0048] In an optimized implementation, the opening and closing drive unit 7 is a cylinder. The working principle of the opening and closing valve plate 6 is as follows: when the cylinder receives an opening command, the piston rod retracts, and the opening and closing valve plate rotates around the mounting hinge hole B. The opening and closing valve plate rotates towards the side wall of the hopper, opening the valve plate and allowing the material in the sand filling hopper to fall under gravity, completing the sand filling operation. When the steel outlet channel is blocked, the cylinder reverses its action, the piston rod extends, and the opening and closing valve plate rotates around the mounting hinge hole B, closing the valve plate and allowing sand to be replenished to the sand filling hopper in preparation for the next sand filling operation.

[0049] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0050] Those skilled in the art will understand that this invention can be implemented in many other specific forms without departing from the spirit and scope of this invention. Although embodiments of this invention have been described, it should be understood that this invention is not limited to these embodiments, and those skilled in the art can make changes and modifications within the spirit and scope of this invention as defined in the appended claims.

Claims

1. An automatic sand-filling device for an electric arc furnace, comprising a fixed base, a rotating arm, and a sand-filling hopper, wherein the rotating arm is sleeved on the fixed base and can rotate horizontally around the fixed base, the sand-filling hopper is connected to the rotating arm, and an opening / closing valve plate is disposed on the sand outlet of the sand-filling hopper, characterized in that, The opening and closing valve plate is hinged to the sand filling hopper. The opening and closing valve plate is connected to an opening and closing drive unit, so that it has a closed position to block the sand outlet and a sand outlet position away from the sand outlet. The opening and closing drive unit is disposed on the side wall of the sand filling hopper. The rotating arm is connected to a rotary drive unit for driving the sand filling hopper to switch between a standby position away from the steel outlet and a working position above the steel outlet.

2. The automatic sand-filling device for an electric arc furnace according to claim 1, characterized in that, The rotary drive unit is interlocked with the opening and closing drive unit.

3. The automatic sand-filling device for an electric arc furnace according to claim 1, characterized in that, The hinge point between the opening / closing valve plate and the sand filling hopper is located on the side of the sand filling hopper closer to the opening / closing drive unit.

4. The automatic sand-filling device for an electric arc furnace according to claim 3, characterized in that, The end face of the sand outlet has an angle with the cross-section of the sand filling hopper. The opening and closing drive unit is located on the side with the higher sand outlet of the sand filling hopper. The output end of the opening and closing drive unit is hinged to the bottom of the opening and closing valve plate.

5. The automatic sand-filling device for an electric arc furnace according to claim 4, characterized in that, The end face of the sand outlet is either flat or curved.

6. The automatic sand-filling device for an electric arc furnace according to claim 1, characterized in that, The opening and closing valve plate includes a side plate and a bottom plate adapted to the end face of the sand outlet. The side plate is connected to the bottom plate, and the end of the side plate away from the bottom plate is hinged to the sand filling hopper. The side plate is located outside the sand filling hopper, and the bottom plate is connected to the opening and closing drive unit. When located at the sand outlet position, part of the bottom plate is located outside the side wall of the sand filling hopper.

7. The automatic sand-filling device for an electric arc furnace according to claim 6, characterized in that, The base plate includes a first base plate segment and a second base plate segment, which are connected. The surfaces of the first and second base plate segments are both perpendicular to the surfaces of the side plates, and there is an angle between the surfaces of the first and second base plate segments. The sand outlet includes a first sand outlet end face and a second sand outlet end face. The opening and closing valve plate is in the closed position. The first sand outlet end face is correspondingly arranged with the first base plate segment, and the second sand outlet end face is correspondingly arranged with the second base plate segment.

8. The automatic sand-filling device for an electric arc furnace according to claim 1, characterized in that, The side wall of the sand filling hopper is provided with a mounting bracket, the opening and closing drive unit is hinged to the mounting bracket, and the output end of the opening and closing drive unit is hinged to the opening and closing valve plate.

9. The automatic sand-filling device for an electric arc furnace according to claim 1, characterized in that, It also includes a mounting base, on which the rotary drive unit is mounted, and the output end of the rotary drive unit is hinged to the rotating arm.

10. The automatic sand-filling device for an electric arc furnace according to claim 1, characterized in that, The fixed base is provided with a fixed shaft on its upper part, and the end of the rotating arm is provided with a rotating shaft mounting hole, which is rotatably connected to the fixed shaft.

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