A low pressure control system for a steelmaking plant refining furnace

Abstract

The utility model provides a kind of low pressure control system of steel workshop refining furnace, it is related to iron and steel smelting field, and it includes: ladle car, the upper end of ladle car is equipped with bearing table, ladle is located on bearing table, electrode is equipped in ladle, motor is equipped in ladle car, motor is connected with power supply, motor can drive ladle car to move;Electrode lifting mechanism, the clamping end of electrode lifting mechanism is connected with electrode, electrode lifting mechanism can drive electrode to move in vertical direction;Low pressure control system configuration is as follows: electrode lifting mechanism has first position, when the clamping end of electrode lifting mechanism is below first position, the connection of motor and power supply is disconnected, the utility model fundamentally solves the problem that electrode and ladle, furnace body collide caused by the misoperation of ladle car when electrode is not raised in traditional system, significantly reduces equipment damage and safety accident risk.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel smelting, and in particular to a low-pressure control system for a refining furnace in a steelmaking workshop. Background Technology

[0002] As a core piece of equipment in the steelmaking process, the reliability and safety of the refining furnace's control system directly affect production efficiency and molten steel quality. During refining, the ladle car must move the ladle between workstations, while the electrode lifting mechanism must precisely adjust the depth of electrode insertion into the ladle to achieve arc heating. Traditional control systems typically employ independent control strategies, meaning the ladle car movement and electrode position adjustment belong to different control units, lacking a dynamic interlocking protection mechanism. In actual operation, if the ladle car movement is misoperated before the electrode is fully raised to a safe height, it can easily lead to mechanical collisions between the electrode and the ladle, furnace cover, or other equipment, causing serious safety accidents such as electrode breakage and molten steel splashing.

[0003] In existing technologies, some solutions involve setting mechanical limit blocks at the end of the ladle car track or using manual visual judgment to determine the electrode height. However, mechanical limit devices are susceptible to failure due to high-temperature environments and cannot adapt to the flexible adjustment requirements of multiple workstations. Manual intervention methods suffer from problems such as response lag and high risk of misjudgment. In addition, conventional electrode lifting mechanisms mostly use pure hydraulic drives or simple chain drives, which have defects such as low positioning accuracy and uncontrollable lifting speed, making it difficult to meet the stringent requirements of refining processes for dynamic electrode adjustment. Utility Model Content

[0004] The purpose of this invention is to provide a name that avoids collisions between the electrodes and the ladle / furnace body caused by the ladle car malfunctioning when the electrodes are not raised.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a low-pressure control system for a refining furnace in a steelmaking workshop, comprising: a ladle car, the upper end of which is provided with a support platform, the ladle being placed on the support platform, an electrode being provided inside the ladle, a motor being provided inside the ladle car, the motor being connected to a power source, and the motor being able to drive the ladle car to move; an electrode lifting mechanism, the clamping end of which is connected to the electrode, and the electrode lifting mechanism being able to drive the electrode to move in the vertical direction; the low-pressure control system is configured such that: the electrode lifting mechanism has a first position, and when the clamping end of the electrode lifting mechanism is below the first position, the connection between the motor and the power source is disconnected.

[0006] Furthermore, the electrode lifting mechanism includes a column, a hydraulic cylinder, a horizontal arm, and a clamp. The hydraulic cylinder and the horizontal arm are both connected to the column. The hydraulic cylinder can drive the column to move in a vertical direction. The clamp is located at one end of the horizontal arm and can clamp the electrode.

[0007] Furthermore, the low-voltage control system also includes a first limit detector, and a limit stop is provided on the column. The first limit detector is located on the movement path of the limit stop. When the limit stop touches the first limit detector, the clamp is located in the first position.

[0008] Furthermore, the low-voltage control system also includes a second limit detector, which is located on the movement path of the limit contact and is located below the first limit detector.

[0009] Furthermore, the low-voltage control system includes a forward and reverse rotation control circuit, and the power supply is connected to the motor through the forward and reverse rotation control circuit, which can control the working state of the motor.

[0010] Furthermore, the forward and reverse control circuit includes a forward control branch and a reverse control branch. Both the forward control branch and the reverse control branch include a control switch SA. The control switch SA can control the opening and closing state of the forward control branch and the reverse control branch. The control switch SA is connected to the first limit detector, and the first limit detector can control the opening and closing state of the control switch SA.

[0011] Furthermore, the upper end of the ladle is provided with a furnace cover, and the upper end of the electrode extends outside the furnace cover.

[0012] Analysis reveals that this utility model discloses a low-pressure control system for a refining furnace in a steelmaking workshop. This utility model sets a "first position" for the electrode lifting mechanism and a linked power-off mechanism. When the electrode has not risen to a safe height, the system automatically cuts off the power to the ladle car motor, forcibly preventing the ladle car from moving. This design fundamentally solves the problem of electrode collisions with the ladle and furnace body caused by malfunctions of the ladle car when the electrode has not risen, significantly reducing the risk of equipment damage and safety accidents. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein: Figure 1 A schematic diagram of the structure of an embodiment of this utility model.

[0014] Figure 2 A circuit diagram of a low-voltage control system according to an embodiment of this utility model.

[0015] Explanation of reference numerals in the attached drawings: 1. Ladle car; 2. Ladle; 3. Furnace cover; 4. Horizontal arm; 5. Clamp; 6. Electrode. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0017] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0018] The accompanying drawings illustrate one or more examples of the present invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the present invention. As used herein, the terms “first,” “second,” “third,” and “fourth,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of a single component.

[0019] like Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, a low-pressure control system for a refining furnace in a steelmaking workshop is provided. The low-pressure control system includes: The ladle car has a support platform at its upper end, on which the ladle is placed. Electrodes are located inside the ladle, and a motor is also located inside the ladle car. The motor is connected to a power source and can drive the ladle car to move. A furnace cover is located at the upper end of the ladle, and the upper ends of the electrodes extend outside the furnace cover.

[0020] Specifically, the main structure of the ladle car is made of high-temperature resistant steel, and a support platform is provided on its upper part for fixing the ladle. Electrodes are installed inside the ladle. A motor drive device is located at the bottom of the ladle car, which drives the ladle car to move.

[0021] An electrode lifting mechanism is provided, with its clamping end connected to the electrode. The electrode lifting mechanism can drive the electrode to move vertically. The low-voltage control system is configured such that the electrode lifting mechanism has a first position, and when the clamping end of the electrode lifting mechanism is below the first position, the connection between the motor and the power supply is disconnected.

[0022] Specifically, the electrode lifting mechanism includes a column, a hydraulic cylinder, a cross arm, and a gripper. Both the hydraulic cylinder and the cross arm are connected to the column. The hydraulic cylinder drives the column to move vertically, while the gripper, located at one end of the cross arm, holds the electrode. The hydraulic cylinder is fixed to the bottom of the column, with its piston rod connected to the column. Power is provided by a hydraulic pump station to drive the column to rise and fall vertically, thereby causing the cross arm and electrode to move synchronously. The cross arm is horizontally fixed to the top of the column, with one end extending above the ladle. The cross arm is made of a material with high bending strength to bear the weight of the electrode and gripper. The gripper is installed at the end of the cross arm and typically uses mechanical grippers or an electromagnetic locking device to ensure the electrode is securely fixed during lifting. The part of the gripper that contacts the electrode is usually equipped with an insulating layer. The electrode lifting mechanism achieves smooth lifting and lowering of the electrode through the linear drive of the hydraulic cylinder, while the cantilever design of the cross arm optimizes the spatial layout and avoids interference with other components of the ladle car.

[0023] Specifically, the low-voltage control system also includes a first limit detector. A limit stop is provided on the column. The first limit detector is located on the movement path of the limit stop. When the limit stop touches the first limit detector, the gripper is in the first position.

[0024] The limit stop is typically a metal protrusion fixed to the side wall of the column and moves up and down with the column. When the clamping end rises to the first position, the limit stop triggers the first limit detector, which controls the closure of the switch SA.

[0025] Preferably, the low-voltage control system further includes a second limit detector located on the movement path of the limit contact head, below the first limit detector. The second limit detector is used to calibrate the lowest position that the gripper can move, preventing the gripper from exceeding its permissible range of movement.

[0026] Specifically, such as Figure 2As shown, the low-voltage control system includes a forward and reverse rotation control circuit. The power supply is connected to the motor through the forward and reverse rotation control circuit, which can control the operating state of the motor. The forward and reverse rotation control circuit includes a forward rotation control branch and a reverse rotation control branch. Both the forward rotation control branch and the reverse rotation control branch include a control switch SA. The control switch SA can control the opening and closing state of the forward rotation control branch and the reverse rotation control branch. The control switch SA is connected to a first limit detector, which can control the opening and closing state of the control switch SA. The forward control branch includes a normally open switch SB1, a control switch SA, a normally closed contact of the second contactor KM2, and the coil of the first contactor KM1, all connected in series. The reverse control branch includes a normally open switch SB2, a control switch SA, a normally closed contact of the first contactor KM1, and the coil of the second contactor KM2, all connected in series. The forward and reverse control branches are connected in parallel. One end of the parallel forward and reverse control branches is connected to the second phase L2 of the three-phase power supply via a fuse, and the other end is connected to the third phase L3 of the three-phase power supply via a fuse. The first phase L1, the second phase L2, and the third phase L3 of the three-phase power supply are sequentially connected to the input terminal of the motor M via the normally open contact of the first contactor KM1. The first phase L1, the second phase L2, and the third phase L3 of the three-phase power supply are connected to the input terminal of the motor M in reverse order via the normally open contact of the second contactor KM2. When the clamp moves to or above the first position during operation, the control switch SA closes. At this time, pressing the normally open switch SB1 will make the ladle car move forward, and pressing the normally open switch SB2 will control the ladle car to move backward.

[0027] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects: This utility model sets a "first position" for the electrode lifting mechanism and a linkage power-off mechanism. When the electrode has not been raised to a safe height, the system automatically cuts off the power supply to the ladle car motor, forcibly preventing the ladle car from moving. This design fundamentally solves the problem of electrode collision with the ladle and furnace body caused by the ladle car's malfunction when the electrode has not been raised in the traditional system, significantly reducing the risk of equipment damage and safety accidents. In addition, the mechanical triggering method of the limit contact head and the first limit detector avoids sensor misjudgment or signal delay problems, further ensuring the reliability of the operation.

[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low-pressure control system for a refining furnace in a steelmaking workshop, characterized in that, include: A ladle car, wherein a support platform is provided at the upper end of the ladle car, the ladle is placed on the support platform, electrodes are provided inside the ladle, and a motor is provided inside the ladle car, the motor is connected to a power source, and the motor can drive the ladle car to move; An electrode lifting mechanism, wherein the clamping end of the electrode lifting mechanism is connected to the electrode, and the electrode lifting mechanism is capable of driving the electrode to move in the vertical direction; The low-voltage control system is configured such that the electrode lifting mechanism has a first position, and when the clamping end of the electrode lifting mechanism is below the first position, the connection between the motor and the power supply is disconnected.

2. The low-pressure control system for a refining furnace in a steelmaking workshop according to claim 1, characterized in that, The electrode lifting mechanism includes a column, a hydraulic cylinder, a horizontal arm, and a clamp. The hydraulic cylinder and the horizontal arm are both connected to the column. The hydraulic cylinder can drive the column to move in the vertical direction. The clamp is located at one end of the horizontal arm and can clamp the electrode.

3. The low-pressure control system for a refining furnace in a steelmaking workshop according to claim 2, characterized in that, The low-voltage control system also includes a first limit detector. The column is provided with a limit stop. The first limit detector is located on the movement path of the limit stop. When the limit stop touches the first limit detector, the clamp is located at the first position.

4. The low-pressure control system for a refining furnace in a steelmaking workshop according to claim 3, characterized in that, The low-voltage control system further includes a second limit detector, which is located on the movement path of the limit contact and is located below the first limit detector.

5. The low-pressure control system for a refining furnace in a steelmaking workshop according to claim 3, characterized in that, The low-voltage control system includes a forward and reverse rotation control circuit. The power supply is connected to the motor through the forward and reverse rotation control circuit, which can control the working state of the motor.

6. The low-pressure control system for a refining furnace in a steelmaking workshop according to claim 5, characterized in that, The forward and reverse control circuit includes a forward control branch and a reverse control branch. Both the forward control branch and the reverse control branch include a control switch SA. The control switch SA can control the opening and closing state of the forward control branch and the reverse control branch. The control switch SA is connected to the first limit detector, and the first limit detector can control the opening and closing state of the control switch SA.

7. The low-pressure control system for a refining furnace in a steelmaking workshop according to claim 1, characterized in that, The ladle is provided with a furnace cover at its upper end, and the upper end of the electrode extends outside the furnace cover.

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