Scraper lifting device and metal processing device

Abstract

To provide a scraper lifting device in which the dead weight of the scraper is not applied to a hydraulic cylinder when it is not used.SOLUTION: A scraper lifting device 14 for vertically moving a scraper that scrapes and collects metal fallen on a lower surface of a furnace of a converter includes a scraper 20, a lifting guide 26 that vertically movably supports the scraper 20, a translation cam 22 that vertically moves the scraper 20 by being laterally moved, and a hydraulic cylinder 24 that laterally moves the translation cam 22. The translation cam 22 has an inclined surface 32 for moving the scraper in the vertical direction, and a horizontal surface 34 or an inclined surface having an inclination opposite to that of the inclined surface.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a scraper lifting device and a metal processing device in which the weight of the scraper is not applied to a cylinder when not in use. [Background technology]

[0002] During converter operation, ingots adhere to the converter's throat during tapping and other times. When the ingots adhered to the throat reach a certain size, they fall to the bottom of 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 below the converter. The ground below the converter is very uneven, and it is inefficient to clean the accumulated ingots using general heavy machinery such as shovels.

[0003] For this reason, Patent Document 1 discloses a device for treating objects that fall below a converter furnace, 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 provided below the converter furnace. According to Patent Document 1, by providing the 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 furnace, 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 treatment device disclosed in Patent Document 1, the weight of the scraper is always applied to the hydraulic cylinder, which causes hydraulic oil leakage and causes the scraper to fall naturally. In order to prevent this natural fall, hooks must be provided on the slag ladle cart and the scraper, and when not in use, a steel bar or the like with holes at both ends must be hung on both hooks to provide a stopper to prevent the scraper from falling. If such a stopper is provided, the stopper must be attached and detached before and after cleaning work is performed using the falling object treatment device, which increases the workload of the operator.

[0006] The present invention has been made in consideration of the problems with the conventional technology, and its object is to provide a scraper lifting device and metal processing device in which the weight of the scraper is not placed on the hydraulic cylinder when not in use. [Means for solving the problem]

[0007] 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 metal that has fallen onto the underside of a converter, the scraper lifting device comprising: the scraper; a lifting guide that supports the scraper so that it can move in the up-down direction; a linear cam that moves the scraper in the up-down direction when moved laterally; and a hydraulic cylinder that moves the linear cam in the laterally direction, wherein the linear cam has a slope that moves the scraper in the up-down direction, and a horizontal plane or a slope with an inclination opposite to that of the slope. [2] The scraper lifting device described in [1], wherein the linear cam has two or more horizontal surfaces or inclined surfaces of opposite inclination that are positioned differently in the vertical direction. [3] The scraper lifting device described in [2], wherein the hydraulic cylinder has a position detection function for detecting a stroke position. [4] A metal processing apparatus comprising a scraper lifting device according to any one of [1] to [3] and a work cart that moves the scraper lifting device along the underside of the furnace. Effect of the Invention

[0008] According to the present invention, the linear cam has one or more horizontal surfaces or slopes with an inclination opposite to that of the slope that moves the scraper up and down, so that the weight of the scraper is not applied to the hydraulic cylinder when not in use. This prevents hydraulic oil from leaking from the hydraulic cylinder and prevents the scraper from falling naturally. As a result, there is no need to provide a stopper on the scraper, so the operator does not have to attach and remove the stopper, and the workload of the operator due to this work is suppressed. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic cross-sectional view of a metal processing apparatus 10 according to the present embodiment. [Diagram 2] FIG. 2 is a schematic front view of the metal processing apparatus 10. As shown in FIG. [Diagram 3] FIG. 3 is an enlarged schematic diagram of the contact portion between the translation cam and the moving member 28. As shown in FIG. [Figure 4] FIG. 4 is a schematic side view showing a contact portion between another example of the linear cam and the moving member 28. As shown in FIG. [Diagram 5] FIG. 5 is a schematic side view showing the shape and dimensions of the linear cam used in the examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the present invention will be described through the embodiments of the present invention. Fig. 1 is a schematic cross-sectional view of an ingot processing apparatus 10 according to this embodiment. Fig. 2 is a schematic front view of the ingot processing apparatus 10. The configuration of the ingot processing apparatus 10 will be described with reference to Figs. 1 and 2. The ingot processing apparatus 10 uses a scraper 20 to scrape up ingots accumulated on the underside of a furnace below a converter, and cleans the underside of the furnace.

[0011] The metal processing apparatus 10 has a scraper lifting device 14 that raises and lowers the scraper 20, and a work cart 12 that moves the scraper lifting device 14 along the underside of the furnace. The work cart 12 has wheels 16 and may be any type capable of traveling along the underside of the converter, and may also have a drive device for self-propelling.

[0012] The scraper lifting device 14 has a scraper 20, a linear cam 22, a hydraulic cylinder 24, a lifting guide 26, a moving member 28, a rail 30, and a seal member 42. The scraper 20 is used to drop onto the underside of the converter and scrape up the accumulated metal. The scraper 20 is preferably shaped so that its lower end is inclined so as to protrude in the scraping direction. This makes it easier to scrape off the metal accumulated on the underside of the converter, and the scraped metal can be easily scraped up.

[0013] The linear cam 22 is a cam having an inclined surface 32 that moves the movable member 28 and the scraper 20 up and down when moved laterally, and a horizontal surface 34 that does not move them up and down even when moved laterally. The linear cam 22 moves laterally on a rail 30 provided below the linear cam 22.

[0014] In this embodiment, due to the inclined surface 32 of the linear cam 22, when the linear cam 22 moves to the right in the drawing, the moving member 28 and the scraper 20 move upward, and when the linear cam 22 moves to the left, the moving member 28 and the scraper 20 move downward.

[0015] The rod 40 of the hydraulic cylinder 24 is connected to the linear cam 22. As a result, by extending and retracting the rod 40 of the hydraulic cylinder 24, the hydraulic cylinder 24 moves the linear cam 22 in the lateral direction. It is preferable to use a hydraulic cylinder having a position detection function that can detect the stroke position of the rod 40 as the hydraulic cylinder 24.

[0016] The lifting guide 26 is provided at the front of the working cart 12 in the traveling direction, and supports the moving member 28 and the scraper 20 connected to the moving member 28 so that they can move in the vertical direction. The lifting guide 26 is provided with oblong holes 27 that are longer in the vertical direction than in the lateral direction, at positions corresponding to guide pins 38 of the moving member 28, which will be described later.

[0017] The movable members 28 are provided at two different positions in the width direction of the metal processing device 10, and are U-shaped members with one end abutting against the linear cam 22 and the other end connected to the scraper 20. Each movable member 28 is provided with two guide pins 38 arranged side by side in the vertical direction, and wheels 36. The two guide pins 38 each engage with the elongated hole 27 of the lift guide 26. This restricts the movement direction of the movable member 28 to the vertical direction.

[0018] 1 shows an example in which the moving direction of the moving member 28 is restricted to the up-down direction by engaging two guide pins 38 with the elongated holes 27, but this is not limiting. For example, instead of the guide pin 38 of the moving member 28, a guide pin with an elliptical cross section may be provided, and the guide pin may be engaged with the elongated holes 27 to restrict the moving direction of the moving member 28 to the up-down direction.

[0019] In addition, in the metal processing device 10 according to the present embodiment, an example is shown in which the scraper 20 and the moving member 28 are included, but the present invention is not limited to this. For example, a scraper having the function of the moving member 28 described above may be used, and in this case, the scraper lifting device 14 may not include the moving member 28.

[0020] The wheels 36 are provided on the moving member 28 at a position where it comes into contact with the linear cam 22. The moving member 28 comes into contact with the inclined surface 32 and horizontal surface 34 of the linear cam 22 at the wheels 36. By providing the wheels 36 at a position where it comes into contact with the linear cam 22 in this way, the moving member 28 can smoothly follow the shape of the linear cam 22. This reduces the frictional force at the contact portion between the moving member 28 and the linear cam 22, and makes it possible to move the linear cam 22 laterally even with a low-output hydraulic cylinder 24.

[0021] The sealing member 42 seals gaps occurring in the movable area of ​​the movable member 28. The sealing member 42 is, for example, a bellows-shaped sheet. By providing the sealing member 42 that seals gaps in the movable area of ​​the movable member 28 in this manner, dust is prevented from entering the work cart 12 even in a dusty environment such as the lower part of a converter furnace. This makes it possible to prevent dust from accumulating on the rail 30 and causing malfunction of the linear cam 22.

[0022] FIG. 3 is a side view showing the contact portion between the linear cam 22 and the moving member 28. The operation of the linear cam 22 and the moving member 28 will be described with reference to FIG. 3. The moving member 28 is connected to the scraper 20. Therefore, the weight of the moving member 28 and the scraper 20 is supported by the two contact portions between the linear cam 22 and the moving member 28. Therefore, when the linear cam 22 is stopped at a position where the wheel 36 is in contact with the slopes 32a and 32b during non-use, a force that moves the linear cam 22 to the left is continuously applied by the weight of the moving member 28 and the scraper 20 and the slopes 32a and 32b. If this force continues to be applied to the hydraulic cylinder 24 through the rod 40, a hydraulic oil leak occurs in the hydraulic cylinder 24, and the rod 40 starts to move to the left. Due to this movement of the rod 40, the linear cam 22 also starts to move to the left, and as a result, the moving member 28 and the scraper 20 fall naturally.

[0023] In contrast, in the scraper lifting device 14 according to this embodiment, the linear cam 22 is provided with horizontal surfaces 34a, 34b, and 34c, and when not in use, the linear cam 22 is stopped at a position where any of the horizontal surfaces 34a, 34b, and 34c abuts against the wheel 36. As a result, the weight of the moving member 28 and the scraper 20 can be supported by the horizontal surfaces 34a, 34b, and 34c, so that no force is generated to move the linear cam 22 laterally while the device is stopped. As a result, hydraulic oil leakage from the hydraulic cylinder 24 is prevented, and the moving member 28 and the scraper 20 are prevented from falling naturally. Therefore, in the scraper lifting device 14 according to this embodiment, it is not necessary to provide a stopper on the scraper 20, and the operator does not need to attach or remove the stopper, which suppresses the increase in the operator's workload due to the work.

[0024] The linear cam 22 has two or more horizontal planes 34a, 34b, and 34c that are different in position in the vertical direction. This allows the linear cam 22 to be stopped at a position where the horizontal planes and the wheels 36 come into contact, not only when the scraper 20 is not in use, but also when, for example, the scraper 20 is fixed downward to scrape up the metals deposited on the underside of the converter, and prevents the weight of the moving member 28 and the scraper 20 from being applied to the hydraulic cylinder. In the scraper lifting device 14 according to this embodiment, the horizontal plane 34a is a horizontal plane used when the scraper 20 is not in use. The horizontal plane 34c is a horizontal plane used when the scraper 20 is lowered to the lowest end to clean the deposits deposited on the underside of the converter. The horizontal surface 34b is a horizontal surface used for cleaning up some of the deposits when there is a large amount of deposits of metals and the like and when attempting to clean up the deposits by lowering the scraper 20 to the lowest end, the reaction force from the deposits is too great and the work cart cannot move forward.

[0025] In the case where the linear cam 22 has two or more horizontal planes 34a, 34b, 34c that are positioned differently in the up-down direction, it is more preferable that the hydraulic cylinder 24 is a hydraulic cylinder having a position detection function that can detect the stroke position of the rod 40. This allows the stroke of the rod 40 to be controlled, and the position of the linear cam 22 can be controlled so that the wheels 36 abut on each horizontal plane. Note that instead of a hydraulic cylinder having a position detection function that detects the stroke position, a limit switch may be provided on the rail 30 to detect the position of the linear cam 22, and the hydraulic cylinder 24 may be controlled using the detected position of the linear cam 22.

[0026] Fig. 4 is a schematic side view showing another example of a linear cam and a contact portion between the linear cam and the movable member 28. In the linear cam 50 shown in Fig. 4, the same components as those of the linear cam 22 and the movable member 28 shown in Fig. 3 are given the same reference numerals, and their description will be omitted. The linear cam 50 shown in Fig. 4 differs from the linear cam 22 in that it has inclined surfaces 52b and 52c with an inclination opposite to that of the inclined surfaces 32a and 32b, instead of the horizontal surfaces 34b and 34c.

[0027] As shown in FIG. 4, when the wheel 36 abuts on the boundary between the slope 32a and the slope 52b, no force is generated to move the linear cam 22 laterally due to the weight of the moving member 28 and the scraper 20. In this way, the linear cam may have a slope with an inclination opposite to that of the slope that moves the moving member 28 and the scraper 20 vertically instead of a horizontal surface. This prevents the force that moves the linear cam 50 laterally due to the weight of the moving member 28 and the scraper 20 when not in use, so that the hydraulic oil leak is prevented from occurring in the hydraulic cylinder 24, and the moving member 28 and the scraper 20 do not fall naturally. In this embodiment, the inclination is, for example, a right-upward slope when the slope that moves the moving member 28 and the scraper 20 vertically is a right-downward slope. EXAMPLES

[0028] Next, an example will be described. Fig. 5 is a schematic side view showing the shape and dimensions of the linear cam used in the example. The linear cam used in the example has three horizontal surfaces at different positions in the vertical direction, and two inclined surfaces that move the moving member and scraper in the vertical direction, similar to the linear cam 22 shown in Fig. 3.

[0029] Of the three horizontal surfaces, the top one is used when not in use, the bottom one is used when the scraper is lowered to the lowest position to clean the deposits that have accumulated on the underside of the converter, and the middle one is used when the scraper is lowered to the lowest position to clean the deposits, but the reaction force from the deposits is too strong and the work cart cannot move forward.

[0030] In order to stop the hydraulic cylinder when the wheels of the moving parts reach each horizontal plane, a hydraulic cylinder with a thrust of 6000 kgf and a stroke of 1500 mm was used, which had a position detection function that could detect the stroke position of the rod. As described above, the wheels of the moving parts were positioned at each horizontal plane when not in use and when cleaning deposits, and this metal processing equipment with a linear cam was used in operation for six months. As a result, no trouble occurred with the scraper lifting device, and cleaning under the converter was possible without any problems. Furthermore, no natural fall of the scraper was observed during this time. [Explanation of symbols]

[0031] 10 Metallurgy Processing Equipment 12 Work trolley 14 Scraper lifting device 16 wheels 20 Scraper 22 Linear cam 24 Hydraulic Cylinder 26 Lifting guide 27 Slot 28 Moving parts 30 Rail 32 Slope 32a, 32b Slopes 34 horizontal plane 34a, 34b, 34c horizontal plane 36 wheels 38 Guide pin 40 Rod 42 Sealing material 50 Linear cam 52b, 52c Slopes

Claims

1. A scraper lifting device that moves a scraper that scrapes up metal that has fallen to the bottom surface of a converter in the vertical direction, The scraper; A lift guide that supports the scraper so as to be movable in the vertical direction; A linear cam that moves the scraper in a vertical direction by being moved laterally; A hydraulic cylinder that moves the linear cam laterally; having The scraper lifting device, wherein the linear cam has a slope that moves the scraper up and down, and a horizontal surface or a slope having an inclination opposite to that of the slope.

2. The scraper lifting device according to claim 1 , wherein the linear cam has two or more horizontal surfaces or inclined surfaces with opposite inclinations that are different in vertical positions.

3. The scraper lifting device according to claim 2 , wherein the hydraulic cylinder has a position detection function for detecting a stroke position.

4. A scraper lifting device according to any one of claims 1 to 3; A work cart that moves the scraper lifting device along the underside of the furnace; The bullion processing device comprising:

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