Scraper lifting device, metal processing device, and scraper lifting method

Abstract

To provide a scraper lifting device capable of pressing a scraper to the lower part of a furnace and suppressing the transmission of the impact of the scraper to an electric actuator after the drive is released.SOLUTION: A scraper lifting device 12 for vertically moving a scraper for scraping and collecting metal fallen on a furnace lower surface of a converter includes a scraper 20, a link mechanism 30 connected to the scraper 20 and composed of a plurality of movable members 32 and 34, and an electric actuator for vertically moving the scraper 20 by moving at least one of the plurality of movable members 32 and 34. The electric actuator and the movable members 32 and 34 are connected such that the movable members 32 and 34 can move relative to the electric actuator in a moving direction of the electric actuator.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a scraper lifting device that vertically moves a scraper that scrapes up metals accumulated in the lower part of a furnace below a converter, a metal processing device, and a scraper lifting method. [Background technology]

[0002] During converter operation, ingots adhere to the converter throat during tapping and other times. When the ingots adhered to the throat reach a certain size, they fall to the lower part of the furnace below the converter and pile up there. Because ladle carts and steel receiving carts enter the area below the converter, if the accumulated ingots are left as they are, they may collide with the ladle carts or steel receiving carts and derail. For this reason, it is necessary to periodically clean the ingots that have accumulated at the lower part of the converter. The ground below the converter is very uneven, so it is inefficient to clean the accumulated ingots using general heavy machinery such as shovels.

[0003] For this reason, Patent Document 1 discloses a fallen object treatment device in which a scraper connected to a hydraulic cylinder via a link mechanism is provided in front of a slag ladle cart that runs on rails. According to Patent Document 1, by providing a scraper on the slag ladle cart that runs on rails, it is possible to efficiently clean up the metals that have accumulated below the converter even when the ground below the furnace is very uneven. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 5-9541 Summary of the Invention [Problem to be solved by the invention]

[0005] In the falling object processing device disclosed in Patent Document 1, the weight of the scraper is constantly applied to the hydraulic cylinder, which causes hydraulic oil leakage and causes the scraper to naturally fall. In order to prevent this natural fall, it is possible to use an electric cylinder having a ball screw and a motor instead of the hydraulic cylinder. However, since the electric cylinder has inferior shock resistance compared to the hydraulic cylinder, simply replacing the hydraulic cylinder with the electric cylinder raises the problem that the electric cylinder is more likely to break down due to the impact received by the scraper.

[0006] As a configuration for preventing the transmission of impact to the electric cylinder, a method of using a winch to suspend the scraper with a wire and raise and lower it is also possible to consider this method. However, this method has the problem that since there is no force pressing the scraper downward, when the metal gets under the scraper, the scraper floats and the metal cannot be peeled off properly.

[0007] The present invention has been made in consideration of the problems with the conventional technology, and its purpose is to provide a scraper lifting device, bullion processing device, and scraper lifting method that can press the scraper against the lower part of the furnace and prevent the impact of the scraper from being transmitted to the electric actuator after the drive is released. [Means for solving the problem]

[0008] The means for solving the above problems are as follows. [1] A scraper lifting device that moves a scraper in an up-down direction to scrape up bullion accumulated in the lower part of a furnace below a converter, the scraper lifting device comprising: the scraper; a link mechanism connected to the scraper and composed of a plurality of movable members; and an electric actuator that moves at least one of the plurality of movable members to move the scraper in an up-down direction, the electric actuator and the movable member being connected such that the movable member can move relative to the electric actuator in the direction of movement of the electric actuator. [2] The scraper lifting device described in [1], which has a stopper that limits the movement of the movable member so that the range of movement of the movable member relative to the electric actuator is narrowed. [3] A metal processing apparatus comprising the scraper lifting device according to [1] or [2], and a work cart that moves the scraper lifting device along the lower part of the furnace. [4] A scraper lifting method using the scraper lifting device described in [1] or [2], comprising: moving the movable member with the electric actuator; and then moving the electric actuator in the reverse direction. [5] A scraper lifting method using the scraper lifting device described in [2], comprising moving the electric actuator in the reverse direction so that the range of movement of the movable member relative to the electric actuator is equal to or greater than the range in which the movement of the movable member is restricted by the stopper. Effect of the Invention

[0009] In the scraper lifting device according to the present invention, the movable member constituting the link mechanism connected to the scraper and the electric actuator are connected at a connection part between the movable member and the electric actuator so that the movable member can move relative to the electric actuator in the moving direction of the electric actuator. This allows the scraper to be driven so as to press against the lower part of the furnace, and after the drive is released, the impact of the scraper is prevented from being transmitted to the electric actuator. By using the scraper lifting device configured in this way, the free fall of the scraper can be prevented by using the electric actuator, and the failure of the electric cylinder can also be prevented. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic cross-sectional view of a metal processing apparatus according to a first embodiment. [Diagram 2] FIG. 2 is a schematic view taken along the line A in FIG. [Diagram 3]FIG. 3 is a schematic partial cross-sectional view showing the movement of the electric cylinder and the movable member. [Figure 4] FIG. 4 is a schematic cross-sectional view of a metal processing apparatus according to the second embodiment. [Diagram 5] FIG. 5 is a schematic diagram showing a drive transmission configuration for transmitting the drive force of the electric motor to the link mechanism. [Figure 6] FIG. 6 is a cross-sectional view taken along line CC of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the present invention will be described through the embodiments of the present invention. Fig. 1 is a cross-sectional schematic diagram of an ingot processing apparatus 10 according to a first embodiment of the present invention. Fig. 2 is a schematic diagram viewed from an arrow A in Fig. 1. The configuration of the ingot processing apparatus 10 according to the first embodiment will be described with reference to Figs. 1 and 2. The ingot processing apparatus 10 is used to scrape up ingots accumulated in the lower part of a furnace below a converter using a scraper 20, and clean the lower part of the furnace.

[0012] The metal processing apparatus 10 has a scraper lifting device 12 that raises and lowers the scraper 20, and a work cart 14 that moves the scraper lifting device 12 along the lower part of the furnace. The work cart 14 may be any type that can run along the lower part of the furnace below the converter, and may have a drive device for self-propelling. The scraper lifting device 12 is not limited to the work cart 14, and may be attached to a steel receiving cart or a ladle cart that can run along the lower part of the furnace.

[0013] The scraper lifting device 12 has a scraper 20, an electric cylinder 22, a link mechanism 30 having two movable members 32, 34, and a slide guide 48. The scraper 20 is used to drop into the lower part of the furnace below the converter and scrape up the accumulated metal. The scraper 20 is preferably shaped so that its lower end protrudes in the scraping direction. This makes it easier for the scraper 20 to scrape off the metal accumulated in the lower part of the furnace below the converter, and the scraped off metal can be easily scraped up and cleaned. The slide guide 48 is attached to the front of the work cart 14 and regulates the movement direction of the scraper 20 in the vertical direction.

[0014] The electric cylinder 22 has a motor 23 and a rod 24 that is extended and retracted by the motor. A long hole 26 that is long in the same direction as the drive direction of the electric cylinder 22 is provided at the tip of the rod 24. The electric cylinder 22 is an example of an electric actuator.

[0015] The link mechanism 30 is configured by rotatably connecting the ends of two movable members 32, 34 to each other. The number of movable members constituting the link mechanism 30 may be two or more. One end of the link mechanism 30 is rotatably connected to the scraper 20, and the other end is rotatably connected to the upper part of the side of the work cart 14. In addition, it is preferable that the movable members 32, 34 are bent toward the side away from the work cart 14. As a result, by bringing the angle formed by the movable members 32, 34 closer to 180°, the scraper 20 can be moved downward and pressed against the lower part of the furnace.

[0016] At least one of the movable members 32, 34 constituting the link mechanism 30 is connected to the rod 24 of the electric cylinder 22 so as to be movable in the movement direction of the electric cylinder 22. In the example shown in Fig. 1, the movable members 32, 34 are connected to the electric cylinder 22 by engaging the long hole 26 of the rod 24 with a pin 36 that connects the movable members 32, 34. By connecting the pin 36 of the movable members 32, 34 by engaging with the long hole 26 of the rod 24 in this manner, the electric cylinder 22 and the movable members 32, 34 can be connected so that the movable members 32, 34 can move relative to the electric cylinder 22 in the movement direction of the electric cylinder 22.

[0017] The stopper 40 is a member that limits the movement of the movable members 32, 34 so that the range of movement of the movable members 32, 34 relative to the electric cylinder 22 is narrowed. In the example shown in Fig. 1, the movable members 32, 34 abut against the stopper 40 before the pin 36 of the movable members 32, 34 abuts against the end face of the elongated hole 26. The stopper 40 is provided with a space 42 through which the movable members 32, 34 and the rod 24 of the electric cylinder 22 can move within the stopper 40, and a wall 44 that limits the movement of the movable members 32, 34 in the direction away from the work cart 14. The wall 44 is provided with an opening 46 through which the rod 24 can pass.

[0018] When the scraper 20 is pressed against the lower part of the furnace, the metal processing device 10 drives the electric cylinder 22 to move the rod 24 in a direction to shorten it. As a result, the angle of the movable members 32, 34 approaches 180°, and the position where the movable member 34 and the scraper 20 are connected moves downward, so that the scraper 20 is pressed against the lower part of the furnace. By pressing the scraper 20 in this way, it is possible to prevent the metal from getting under the scraper 20 and the scraper 20 from floating up, and to prevent the metal from being unable to be peeled off properly.

[0019] Fig. 3 is a partial cross-sectional schematic diagram showing the movement of the electric cylinder 22 and the movable members 32, 34. Fig. 3(a) is a partial cross-sectional schematic diagram showing a state in which the scraper 20 is pressed against the lower part of the furnace. Fig. 3(b) is a partial cross-sectional schematic diagram showing a state in which the scraper 20 is released from the pressing against the lower part of the furnace. Fig. 3(c) is a partial cross-sectional schematic diagram showing a state in which the scraper 20 is moved upward by receiving an impact from the ingot.

[0020] 3(a), with the scraper 20 pressed against the lower part of the furnace, the electric cylinder 22 is driven to move the rod 24 toward the working cart 14. This movement of the rod 24 causes the end of the long hole 26 of the rod 24 to engage with the pin 36 of the movable members 32, 34, and the movable members 32, 34 are moved. This movement of the movable members 32, 34 causes the scraper 20 connected to the end of the movable member 34 to move downward, so that the scraper 20 can be pressed against the lower part of the furnace below the converter.

[0021] 3(b), when the scraper 20 is released from the pressure against the lower part of the furnace, the rod 24 of the electric cylinder 22 is moved in the direction opposite to the direction in which the scraper 20 is pressed against the lower part of the furnace. As a result, even if the scraper 20 moves upward due to an impact from the metal, the engagement between the pin 36 of the movable members 32, 34 and the long hole 26 is released, and a gap is generated between the pin 36 and the long hole 26, so that the impact is prevented from being transmitted to the electric cylinder 22.

[0022] It is also preferable to move the rod 24 of the electric cylinder 22 away from the work cart 14 so that the range of movement of the movable members 32, 34 relative to the electric cylinder 22 is equal to or greater than the range in which the movement of the movable members 32, 34 is restricted by the stopper 40. As a result, the movable members 32, 34 abut against the wall portion 44 of the stopper 40 before the pin 36 of the movable members 32, 34 abuts against the end face of the elongated hole 26, so that the impact of the scraper 20 is not transmitted to the electric cylinder 22. In this state, the ingots processing device 10 scrapes up the ingots accumulated in the lower part of the furnace below the converter, and cleans the lower part of the furnace.

[0023] As shown in FIG. 3(c), when the scraper 20 receives an impact from the metal and moves upward, the movement of the scraper 20 causes the movable members 32, 34 to move away from the work cart 14. However, as described above, since the rod 24 of the electric cylinder 22 has been moved, the movable members 32, 34 abut against the wall portion 44 of the stopper 40 before the pins 36 of the movable members 32, 34 abut against the end faces of the elongated holes 26. In this way, the impact caused by the upward movement of the scraper 20 is received by the stopper 40, and the impact is not transmitted to the electric cylinder 22. In addition, the lateral impact of the scraper 20 is received by the slide guide 48 and the frame of the work cart 14. Therefore, the lateral impact is not transmitted to the electric cylinder 22 either.

[0024] In this way, the scraper lifting device 12 according to the first embodiment can press the scraper 20 against the lower part of the furnace, and can suppress the upward and lateral impacts generated when scraping up the deposits from being transmitted to the electric cylinder 22. As a result, by using the electric cylinder 22, it is possible to suppress the free fall of the scraper 20, and also to suppress the breakdown of the electric cylinder 22.

[0025] In addition, in the metal processing apparatus 10 having the scraper lifting device 12 according to the first embodiment, the metals accumulated in the lower part of the furnace below the converter are scraped up and cleaned in the state shown in Fig. 3(b). When the metals get under the scraper 20, the scraper 20 is pressed against the lower part of the furnace by the electric cylinder 22 as shown in Fig. 3(a). This makes it possible to scrape off the metals successfully even when the metals get under the scraper 20.

[0026] Next, a second embodiment of the present invention will be described. FIG. 4 is a schematic cross-sectional view of a bullion processing apparatus 60 according to the second embodiment. FIG. 5 is a schematic view showing a drive transmission structure for transmitting the driving force of an electric motor 68 to a link mechanism 30. In the bullion processing apparatus 60 shown in FIGS. 4 and 5, the same components as those in the bullion processing apparatus 10 shown in FIG. 1 are given the same reference numerals, and their description will be omitted. The bullion processing apparatus 60 shown in FIG. 4 has a scraper lifting device 62 and a work cart 14. The scraper lifting device 62 is different from the bullion processing apparatus 10 shown in FIG. 1 in that it has an electric motor 68, a first clutch 70, and a second clutch 72. The electric motor 68 is another example of an electric actuator.

[0027] In the bullion processing device 60, a first clutch 70 is provided on the electric motor 68, and a second clutch 72 is provided on one end side of the movable member 32, and the first clutch 70 and the second clutch 72 transmit the rotational drive of the electric motor 68 to the movable member 32. In this way, the rotational drive of the electric motor 68 is transmitted to the movable member 32, and the movable member 32 is rotated clockwise to make the angle between the movable members 32, 34 approach 180°. As a result, the scraper 20 moves downward, and the scraper 20 can be pressed against the lower part of the furnace.

[0028] In addition, the second clutch 72 is provided with a protrusion 74 that receives the rotational drive from the first clutch 70, and a notch 76 that does not receive the drive. By providing the second clutch 72 with the protrusion 74 and the notch 76 in this way, the scraper 20 can be pressed against the lower part of the furnace when necessary, and during cleaning, even if the scraper 20 moves upward due to the impact generated when scraping up the deposits, the impact is prevented from being transmitted to the electric motor 68.

[0029] Fig. 6 is a CC sectional view of Fig. 5(a). Fig. 6(a) is a CC sectional view of the scraper 20 in a state where it is pressed against the lower part of the furnace, and Fig. 6(b) is a CC sectional view of the scraper 20 in a state where it is released from the pressing against the lower part of the furnace.

[0030] As shown in FIG. 6(a), when the scraper 20 is pressed against the lower part of the furnace, the first clutch 70 and the second clutch 72 are engaged, so that the clockwise rotational drive of the electric motor 68 is transmitted to the movable member 32, and the movable member 32 is rotated clockwise to press the scraper 20 against the lower part of the furnace. On the other hand, as shown in FIG. 6(b), when the scraper 20 is released from the pressing against the lower part of the furnace, the electric motor 68 is rotated counterclockwise (in the reverse direction). Then, since the notch 76 is located downstream of the first clutch 70 in the clockwise direction, even if the scraper 20 is impacted and rises, causing the movable member 32 to rotate counterclockwise, the first clutch 70 and the second clutch 72 are not engaged by the notch 76, so that the impact is prevented from being transmitted to the electric motor 68.

[0031] The size of the notch 76 of the second clutch 72 is preferably set to a size such that, when the movable members 32, 34 rotate counterclockwise upon receiving an impact, the movable members 32, 34 collide with the stopper 40 before the first clutch 70 and the second clutch 72 are locked. Then, the electric motor 68 is rotated in the reverse direction so that the range in which the second clutch 72 can rotate relative to the first clutch 70 is equal to or larger than the range in which the rotation of the movable members 32, 34 is restricted by the stopper 40. This ensures that the impact of the scraper is not transmitted to the electric motor 68.

[0032] In this way, in the scraper lifting device 62 according to the second embodiment, the scraper 20 can be pressed against the lower part of the furnace, and the upward impact generated when scraping up the deposits can be prevented from being transmitted to the electric motor 68. As a result, by using the electric motor 68, the free fall of the scraper 20 can be prevented, and the breakdown of the electric motor 68 can also be prevented.

[0033] In addition, in the metal processing device 60 having the scraper lifting device 62 according to the second embodiment, the metals accumulated in the lower part of the furnace below the converter are scraped up and cleaned in the state shown in Fig. 6(b). When the metals get under the scraper 20, the scraper 20 is pressed against the lower part of the furnace by the electric cylinder 22 as shown in Fig. 6(a). This makes it possible to scrape off the metals well even when the metals get under the scraper 20. EXAMPLES

[0034] The scraper lifting device 12 shown in Fig. 1 was attached to a steel receiving cart that could travel under the furnace, and was used to clean the underside of the furnace for about three months. The travelling speed of the cart during cleaning was about 40 m / min, and the weight of the metals accumulated in the lower part of the furnace under the converter was 1 to 100 kg.

[0035] After three months of cleaning, the electric cylinder 22 was inspected, but no noticeable malfunction was found, and the scraper 20 could be raised and lowered without any problems. Furthermore, when metal was caught under the scraper 20, the scraper 20 was pressed against the lower part of the furnace, so the scraper did not float, and the metal accumulated in the lower part of the furnace could be scraped up, and the lower part of the furnace could be cleaned. [Explanation of symbols]

[0036] 10 Metallurgy Processing Equipment 12 Scraper lifting device 14 Work trolley 20 Scraper 22 Electric Cylinder 23 Motor 24 Rod 26 Slot 30 Link mechanism 32 Movable parts 34 Movable parts 36 pin 40 Stopper 42 Space section 44 Wall 46 Opening 48 Slide Guide 60 Bullion Processing Equipment 62 Scraper lifting device 68 Electric Motor 70 First clutch 72 Second clutch 74 Protrusion 76 Cutout

Claims

1. A scraper lifting device that moves a scraper that scrapes up metal accumulated in the lower part of the furnace below the converter in the vertical direction, The scraper; A link mechanism connected to the scraper and composed of a plurality of movable members; An electric actuator that moves at least one of the plurality of movable members to move the scraper in a vertical direction; having A scraper lifting device, wherein the electric actuator and the movable member are connected so that the movable member can move relative to the electric actuator in the movement direction of the electric actuator.

2. The scraper lifting device according to claim 1 , further comprising a stopper that limits movement of the movable member so that a range of movement of the movable member relative to the electric actuator is narrowed.

3. The scraper lifting device according to claim 1 or 2, A work cart that moves the scraper lifting device along the lower part of the furnace; The bullion processing device comprising:

4. A scraper lifting method using the scraper lifting device according to claim 1 or 2, A scraper lifting and lowering method comprising: moving the movable member by the electric actuator, and then moving the electric actuator in the reverse direction.

5. A scraper lifting method using the scraper lifting device according to claim 2, A scraper raising and lowering method comprising: moving the electric actuator in the reverse direction so that the range of movement of the movable member relative to the electric actuator is equal to or greater than the range in which the movement of the movable member is limited by the stopper.

Images