WO2017217083A1

WO2017217083A1 - Sliding gate

Info

Publication number: WO2017217083A1
Application number: PCT/JP2017/014066
Authority: WO
Inventors: 八反田　浩勝; 河生　喜信
Original assignee: 東京窯業株式会社
Priority date: 2016-06-15
Filing date: 2017-04-04
Publication date: 2017-12-21
Also published as: JP6510466B2; JP2017221960A

Abstract

Provided is a sliding gate whereby removal of surface pressure application during control of opening/closing of a nozzle outlet can be reliably avoided while removal of surface pressure application and opening/closing of the nozzle outlet in a state of surface pressure application between a fixed plate and a slide plate is realized by a simple configuration by a slide movement by the same slide device. The sliding gate according to the present invention is provided with: a fixed plate; a slide plate; a slide device for causing a slider case for retaining the slide plate to move in sliding fashion in an opening/closing direction of a nozzle outlet; a surface pressure application mechanism for applying a surface pressure between the fixed plate and the slide plate during restriction of sliding movement beyond the normal sliding range of the slider case by the slide device and removing application of surface pressure during allowance of sliding movement beyond the normal sliding range; and a stopper mechanism, the position of which is moved to selectively switch between allowance and prohibition of sliding movement beyond the normal sliding range.

Description

Sliding gate

The present invention relates to a sliding gate capable of applying a surface pressure between a fixed plate and a slide plate and releasing the surface pressure.

Conventionally, there is known a sliding gate provided at a tapping hole at the bottom of a molten steel container and capable of applying a surface pressure between a fixed plate and a slide plate (see, for example, Patent Document 1). Each of the fixed plate and the slide plate is provided with a through hole through which molten steel in the molten steel container flows. The above sliding gate moves the two plates relative to each other by sliding movement of the slide plate by the cylinder as the slide device while applying a surface pressure between the fixed plate and the slide plate, thereby opening and closing the through holes of both plates To control the opening and closing of the outlet of the nozzle inserted into the outlet of the molten steel container, that is, the molten steel flow rate.

The above sliding gate is provided with a surface pressure load mechanism. The surface pressure load mechanism is capable of applying a surface pressure by the spring between the fixed plate and the slide plate and releasing the surface load by causing the cylinder to move back and forth the surface pressure bar that receives the surface pressure by the spring. It is possible. Specifically, during the control of molten steel flow rate at the sliding gate, this surface pressure load mechanism retracts the surface pressure bar with a cylinder to prevent surface leakage between the two plates and control the surface pressure between the two plates. To load. When replacing the plate, the surface pressure bar is advanced by the cylinder to release the surface pressure load between the two plates.

In the sliding gate described above, when the surface pressure bar is retracted by the cylinder, the engaging portion of the surface pressure bar engages with the roller provided on the spring case containing the spring, whereby the surface pressure by the spring is reduced. Loaded between the fixed plate and the slide plate. Further, when the surface pressure bar is advanced by the cylinder, the engagement between the engagement portion of the surface pressure bar and the roller of the spring case is released, so that the load of the surface pressure by the above-described spring is released.

JP 2011-212702

As described above, in the sliding gate where the surface pressure bar is advanced and retracted in the cylinder to open and close the outlet of the nozzle and the surface pressure bar is advanced in the cylinder to replace the plate, the opening and closing control of the outlet of the nozzle is underway. It is necessary to prevent the situation where the surface pressure load is released. If such a configuration is not provided, the surface pressure bar is unexpectedly advanced during the opening and closing control of the outlet of the nozzle, whereby the engagement portion of the surface pressure bar and the roller of the spring case are released. During the opening and closing control of the outlet of the nozzle, there is a possibility that the surface pressure load by the spring between the fixed plate and the slide plate may be released by mistake.

The present invention has been made to solve the above-described problems, and the opening and closing of the nozzle outlet and the release of the surface pressure load in the state where the surface pressure is applied between the fixed plate and the slide plate are the same. An object of the present invention is to provide a sliding gate which can be reliably prevented from being released during opening / closing control of a nozzle outlet while realizing with a simple configuration by sliding movement by a sliding device. Do.

The invention according to claim 1 made in order to solve the above-mentioned problems comprises: a fixed plate attached and fixed to a nozzle outlet of a molten steel container; and the nozzle outlet which is slid relative to the fixed plate. A slide plate for opening and closing, a slide device for slidingly moving a slider case on which the slide plate is detachably held in the opening and closing direction of the nozzle outlet, and slide movement of the slider case by the slide device is a normal slide range In the case where the surface pressure is applied between the fixed plate and the slide plate in the case of being restricted inside, while the slide movement of the slider case beyond the normal slide range by the slide device is permitted. A surface pressure load mechanism for releasing the load of the surface pressure, and Sliding, which includes a stopper mechanism which is moved to selectively switch between a state in which the slide movement of the slide is restricted within the normal slide range and a state in which the slide movement of the slider case is permitted to slide outside the normal slide range. It is a gate.

According to this configuration, when the sliding movement of the slider case by the sliding device is normally restricted within the sliding range by the positional movement of the stopper mechanism, a surface pressure is applied between the fixed plate and the sliding plate. On the other hand, when the sliding movement of the slider device beyond the normal sliding range of the slider case is permitted by the positional movement of the stopper mechanism, the surface pressure load between the fixed plate and the sliding plate is released. Therefore, the opening and closing of the nozzle outlet and the release of the surface pressure load can be realized with a simple structure by the slide movement by the same slide device. In addition, release of the surface pressure load can be reliably avoided during the opening and closing control of the nozzle outlet.

The invention according to claim 2 is the sliding gate according to claim 1, wherein the stopper mechanism restricts the sliding movement of the slider case within the normal sliding range to slide beyond the normal sliding range of the slider case. It is a sliding gate moved to a first position where movement is prohibited and a second position different from the first position where slide movement beyond the normal sliding range of the slider case is permitted.

According to this configuration, the sliding range of the slider case can be switched by moving the stopper mechanism between the first position and the second position.

The invention according to claim 3 is the sliding gate according to claim 2, wherein the stopper mechanism is moved between the first position and the second position and can be abutted against the slider case. And a lever for moving the stopper block between the first position and the second position.

According to this configuration, the sliding range of the slider case can be switched by moving the stopper block that can be brought into contact with the slider case between the first position and the second position using the lever.

The invention according to claim 4 is the sliding gate according to any one of claims 1 to 3, wherein in the surface pressure load mechanism, the slider case is slid and moved beyond the normal slide range by the slide device. A roller lever which rotates in the releasing direction by being pressed by the slider case, and a cam which is connected to the roller lever via a link and which rotates in the releasing direction as the roller lever rotates in the releasing direction , And is a sliding gate that releases the load of the surface pressure by rotation of the cam in the release direction.

According to this configuration, the roller lever is pressed by the slider case which is slid and moved beyond the normal slide range and is rotated in the release direction, and the cam is rotated in the release direction, so that the space between the fixed plate and the slide plate The surface pressure load can be released.

The invention according to claim 5 is the sliding gate according to claim 4, wherein the surface pressure load mechanism is a surface pressure between the fixed plate and the slide plate when the rotational position of the cam is a predetermined rotational position. A spring for generating a spring force for applying a load and releasing the generation of the spring force by the rotation of the cam in the release direction, and the generation of the spring force by the spring is released to release the surface pressure It is a sliding gate that releases the load.

According to this configuration, when the rotational position of the cam is a predetermined rotational position, a surface pressure is applied between the fixed plate and the slide plate by the spring force of the spring, and the surface pressure is generated by the rotation of the cam in the release direction. It is possible to release the load.

The invention according to claim 6 is the sliding gate according to claim 5, wherein the fixing plate is detachably held, and a mounting plate rotatably supporting a spring box accommodating the spring, and the mounting plate. The rotatably supported bottom plate slidably holding the slider case, and the spring box can be taken out with the first predetermined prohibition position where the slide plate is prohibited from being removed from the slider case A first pivoting mechanism for pivoting between the first predetermined possible position, and a second predetermined prohibited position where the bottom plate can not be removed from the slider case, and the second predetermined prohibited position can be removed. Second rotating machine that rotates between the predetermined possible positions of When a sliding gate comprising a.

According to this configuration, the spring box is positioned at the first predetermined prohibition position by rotation by the first rotation mechanism, and the bottom plate is positioned at the second predetermined prohibition position by rotation by the second rotation mechanism. Thus, the slide plate can be prevented from being taken out of the slider case, and the spring box is positioned at the first predetermined possible position by rotation by the first rotation mechanism and by rotation by the second rotation mechanism. By positioning the bottom plate at the second predetermined possible position, the slide plate can be taken out of the slider case.

According to a seventh aspect of the present invention, in the sliding gate according to the sixth aspect, the first predetermined prohibited position of the spring box by the first pivoting mechanism is movably supported by the bottom plate. It is a sliding gate provided with the stopper member which permits / restrict | limits rotation to a 1st predetermined possible position.

According to this configuration, the stopper member movably supported by the bottom plate can permit / regulate rotation of the spring box from the first predetermined prohibited position to the first predetermined possible position.

It is a block diagram of the sliding gate which concerns on one Embodiment of this invention. It is a figure showing the state at the time of surface pressure load of the surface pressure load mechanism with which the sliding gate concerning this embodiment is provided. It is a figure showing the state at the time of surface pressure release of the surface pressure load mechanism with which the sliding gate concerning this embodiment is provided. It is a figure showing the state in the contact possible position of the stopper mechanism with which the sliding gate concerning this embodiment is provided. It is a figure showing the state in the non-contacting position of the stopper mechanism with which the sliding gate which concerns on this embodiment is provided. It is a front view of the sliding gate concerning this embodiment. It is a principal part side view of a sliding gate concerning this embodiment.

Hereinafter, specific embodiments of the sliding gate of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a sliding gate 10 according to an embodiment of the present invention. 1 (A) shows a sectional view of the sliding gate 10 at the pouring position, FIG. 1 (B) shows a sectional view of the sliding gate 10 at the pouring stop position, and FIG. 1 (C). Sectional drawing in the surface pressure release position of the sliding gate 10 is each shown in FIG.

The sliding gate 10 which concerns on this embodiment is an apparatus attached to the molten steel containers 12, such as a ladle and a tundish. The molten steel container 12 is a container made of, for example, an iron plate in which molten steel which is a high temperature molten metal for casting is accommodated. On the inner side of the molten steel container 12, a mass brick as a refractory material is disposed.

The bottom of the molten steel container 12 is provided with a spout 16 for draining the stored molten steel. An insert nozzle 18 is attached and fixed to the spout 16. The insert nozzle 18 is a pouring nozzle inserted in the spout 16. Hereinafter, the insert nozzle 18 is referred to as the upper nozzle 18. The upper nozzle 18 is a member made of a material having high fire resistance (for example, alumina, carbon, etc.) and capable of continuous casting.

The sliding gate 10 is provided corresponding to the upper nozzle 18. The sliding gate 10 includes a fixed plate 20 and a slide plate 22. The sliding gate 10 has a function of controlling the outflow of molten steel from the upper nozzle 18 by sliding movement of the slide plate 22 with respect to the fixed plate 20 to control the communication between the nozzle holes 26 and 32 described later. The fixed plate 20 and the slide plate 22 are each a brick member formed in a plate shape. The fixed plate 20 and the slide plate 22 are arranged to be stacked one on top of the other. The slide plate 22 can slide while sliding along the opposing surface with respect to the fixed plate 20.

The fixing plate 20 is a top plate fixed to the molten steel container 12 via the mounting plate 24 and is detachably mounted to the mounting plate 24 and thus the molten steel container 12. The fixed plate 20 has nozzle holes 26 through which molten steel flows. The nozzle holes 26 are provided for pouring molten steel contained in the molten steel container 12 into an external mold or the like. The nozzle hole 26 has an inner diameter substantially the same as the inner diameter of the outlet 28 of the upper nozzle 18. The fixing plate 20 is fixed to the molten steel container 12 so that the nozzle hole 26 communicates with the outlet 28 of the upper nozzle 18. The fixing plate 20 may have a cushioning material or a tin plate attached as a shock absorbing material on the contact surface with the mounting plate 24.

The slide plate 22 is a lower plate slidably movable relative to the fixed plate 20 and the molten steel container 12, and is detachably attached to the molten steel container 12 and the slide device 30. The slide device 30 is a mechanism for sliding the slide plate 22 relative to the molten steel container 12 and hence the fixing plate 20. The slide device 30 performs slide movement of the slide plate 22 using a hydraulic cylinder or a motor. The slide movement of the slide plate 22 by the slide device 30 is performed linearly along the facing surface.

The slide plate 22 has a nozzle hole 32 through which molten steel flows. The nozzle holes 32 are provided for pouring molten steel contained in the molten steel container 12 into an external mold or the like. The nozzle holes 32 have substantially the same inner diameter as the outlet 28 of the upper nozzle 18 and the inner diameter of the nozzle holes 26 of the fixed plate 20.

The slide device 30 does not allow the nozzle hole 32 to communicate with the nozzle hole 26 at a position where the slide plate 22 communicates the nozzle hole 32 with the nozzle hole 26 of the fixed plate 20 (hereinafter referred to as pouring position A). It is possible to slide to a position (hereinafter referred to as pouring stop position B).

A nozzle 36 for pouring water is attached and fixed to the slide plate 22. The pouring nozzle 36 is disposed on the surface of the slide plate 22 opposite to the fixed plate 20. Hereinafter, the pouring nozzle 36 is referred to as a lower nozzle 36. The lower nozzle 36 is a member made of a material having high fire resistance (for example, alumina, carbon, etc.) and capable of continuous casting.

The lower nozzle 36 has an outlet 38 through which molten steel flows. The outlet 38 has an inner diameter substantially the same as the inner diameter of the outlet 28 and the like of the upper nozzle 18. Fixing of the lower nozzle 36 to the slide plate 22 is performed so that the positional relationship in which the outlet 38 communicates with the nozzle hole 32 of the slide plate 22 is established.
Next, the normal operation of the sliding gate 10 of the present embodiment will be described.

The slide device 30 slides the slide plate 22 to the pouring position A when casting is requested by flowing the molten steel out of the molten steel container 12 containing the molten steel. At the pouring position A, the nozzle holes 32 of the slide plate 22 communicate with the outlet 28 of the upper nozzle 18 inserted into the outlet 16 of the molten steel container 12 and the nozzle holes 26 of the fixed plate 20. In this case, the molten steel accommodated in the molten steel container 12 is discharged from the outlet 28 of the upper nozzle 18 through the nozzle hole 26 of the fixed plate 20, the nozzle aperture 32 of the slide plate 22 and the outlet 38 of the lower nozzle 36. It is poured. Therefore, by making the nozzle holes 32 of the slide plate 22 communicate with the nozzle holes 26 of the fixed plate 20 and thus the outlet 28 of the upper nozzle 18 by the slide device 30, the molten steel in the molten steel container 12 flows out to realize casting. Can.

Further, when the above-described casting stop is required, the slide device 30 slides the slide plate 22 from the pouring position A to the pouring stop position B. When the slide plate 22 is located at the pouring stop position B, the nozzle holes 32 of the slide plate 22 are not communicated with the nozzle holes 26 of the fixed plate 20 and the outlet 28 of the upper nozzle 18 is closed. The outflow of the molten steel contained in is stopped and the above casting is stopped.

Next, with reference to FIGS. 2 to 7, the surface pressure load mechanism provided in the sliding gate 10 of the present embodiment and the mechanism associated with the surface pressure load mechanism will be described.

FIG. 2 shows a state in which the surface pressure load mechanism 40 provided in the sliding gate 10 of the present embodiment is loaded with a surface pressure. FIG. 3 shows a state in which the surface pressure load mechanism 40 provided in the sliding gate 10 of the present embodiment releases the surface pressure. 2A and 3A show a side view of the sliding gate 10, and FIGS. 2B and 3B show a bottom view of the sliding gate 10, respectively.

FIG. 4 is a view showing a state of the stopper mechanism provided in the sliding gate 10 of the present embodiment in the abuttable position. FIG. 5 is a view showing the state of the stopper mechanism provided in the sliding gate 10 of the present embodiment in the non-contacting position. 4A and 5A show a top view of the sliding gate 10, and FIGS. 4B and 5B show a side view of the sliding gate 10, respectively.

FIG. 6 shows a front view of the sliding gate 10 of the present embodiment. 6 (A) shows a state at the time of surface pressure load, and FIG. 6 (B) shows a state at the time of surface pressure release. Moreover, FIG. 7 shows the principal part side view of the sliding gate 10 of this embodiment. 7A shows a state in which the rotation of the spring box is restricted, and FIG. 7B shows a state in which the rotation of the spring box is permitted.

The sliding gate 10 of the present embodiment includes a surface pressure load mechanism 40. The surface pressure load mechanism 40 is a mechanism for loading a surface pressure between the fixed plate 20 and the slide plate 22 and releasing the surface pressure load. When the sliding plate 22 is slid between the pouring position A and the pouring stop position B and slides between the two positions during normal operation of the sliding gate 10, the surface pressure load mechanism 40 The contact pressure is applied between The magnitude of the applied surface pressure allows relative movement of the slide plate 22 with respect to the fixed plate 20 while preventing molten steel leakage from between the

plates

20 and 22.

After the slide plate 22 reaches an end position on one side (hereinafter referred to as a surface pressure load position D) of the surface pressure load mechanism 40, an end position on the opposite side to the surface pressure load position D (hereinafter referred to as a surface). The above-mentioned surface pressure is applied until the pressure release position C is reached). In addition, the surface pressure load mechanism 40 releases the load of the above-mentioned surface pressure from the time the slide plate 22 reaches the surface pressure release position C until the surface pressure load position D is reached.

Hereinafter, the pouring position A and the pouring stop position B including the pouring position A and the pouring stop position B will be referred to as a normal slide range as appropriate. The normal pressure release position C is not included in the normal slide range. The surface pressure release position C is a position on the opposite side of the pouring position A with respect to the pouring stop position B as shown in FIG. Also, the surface pressure load position D may be included in one end of the normal slide range described above, or may not be included in the normal slide range, but from the surface pressure release position C to the pouring stop position B (It should be noted that this range does not include the surface pressure release position C itself, but includes the pouring stop position B itself).

The fixing plate 20 is fixed to the molten steel container 12 via a mounting plate 24. The mounting plate 24 is attached and fixed to the molten steel container 12. The mounting plate 24 may be attached to the molten steel container 12 using a bolt or a bracket. The mounting plate 24 is provided with a recess for receiving the fixing plate 20. The fixing plate 20 is detachably held by the mounting plate 24.

The slide plate 22 is detachably held by a box-shaped slider case 42. The slider case 42 is provided with a recess 44 for housing the slide plate 22. The slider case 42 detachably holds the slide plate 22 at the recess 44. The slider case 42 is slidably held by the bottom plate 46. The slider case 42 is connected to the slide device 30 via a rod 48. The slide device 30 slides the slider case 42 holding the slide plate 22 with respect to the mounting plate 24 and thus the fixing plate 20 by moving the rod 48 on the bottom plate 46.

The bottom plate 46 is rotatably supported by the mounting plate 24 about the hinge pin 50. The hinge pin 50 has an axis extending in the sliding direction of the slider case 42. The bottom plate 46 can be pivoted relative to the mounting plate 24 about the hinge pin 50 including the slide device 30 while holding the slider case 42. The rotation of the bottom plate 46 is performed between the state in which the slide plate 22 is kept horizontal (that is, the closed state) and the state in which the short side of the slide plate 22 stands substantially vertically (that is, the open state). And it is sufficient. The bottom plate 46 is in a position where the slide plate 22 is not removed from the slider case 42 in the closed state. Further, in the open state, the bottom plate 46 is in a position where the slide plate 22 can be removed from the slider case 42.

The sliding gate 10 also comprises a stopper mechanism 52. The stopper mechanism 52 selectively selects the state in which the sliding movement of the slider case 42 is restricted within the normal sliding range, and the state in which sliding movement to the surface pressure release position C beyond the normal sliding range of the slider case 42 is permitted. It is a mechanism to switch. The stopper mechanisms 52 are provided symmetrically with respect to the slider case 42, and are provided on both end sides of the slider case 42 in the direction orthogonal to the sliding movement direction.

Each stopper mechanism 52 has a stopper block 54 and a lever 56. The stopper block 54 is a block-shaped member, and is movably supported by the mounting plate 24 or the like. The stopper block 54 is a member that is movable in the orthogonal direction orthogonal to the direction in which the slider case 42 slides and controls the movement of the slider case 42. The stopper block 54 is advanced to a position where it can be abutted against the slider case 42 (hereinafter referred to as a contactable position) in order to restrict the sliding movement of the slider case 42 within the normal sliding range. (State shown in FIG. 2). Further, the stopper block 54 is moved backward to a position where it is not in contact with the slider case 42 (hereinafter referred to as a non-contacting position) in order to allow sliding movement beyond the normal sliding range of the slider case 42 (hereinafter referred to as non-contacting position). State shown in FIG.

The lever 56 is a member formed in the shape of an arm that can be manually operated by the operator, and is rotatably supported by the bottom plate 46. The lever 56 is connected to the stopper block 54, and it is possible to move the stopper block 54 in the above-mentioned orthogonal direction by its rotation operation. The lever 56 moves the stopper block 54 to the abuttable position by the rotation operation in the first direction in order to restrict the slide movement of the slider case 42 within the normal slide range. Further, the lever 56 moves the stopper block 54 to the non-contacting position by the rotation operation in the second direction in order to allow the slide movement beyond the normal slide range of the slider case 42.

The cotter pin 57 or the safety pin 58 is attached to the lever 56 so that the lever 56 is attached to the bottom plate 46 side. It is prohibited when it is supported, and it is permitted when the cotter pin 57, the safety pin 58, etc. are removed from the lever 56.

The surface pressure load mechanism 40 has roller levers 60 and 62. Each of the roller levers 60 and 62 is a lever that rotates by being abutted against and pressed by the slider case 42. The roller lever 60 is pressed between the fixed plate 20 and the slide plate 22 by being pressed by the slider case 42 when the slider case 42 is slid past the normal sliding range and reaches the surface pressure release position C. Rotate in the direction to release the surface pressure load. The roller lever 62 is pressed by the slider case 42 when the slider case 42 returns to the normal slide range and is slid and reaches the surface pressure load position D after the surface pressure load described above is released. As a result, it rotates in the direction to apply the above-mentioned surface pressure.

Hereinafter, the roller lever 60 will be referred to as the surface pressure releasing roller lever 60, and the roller lever 62 will be referred to as the surface pressure loading roller lever 62, as appropriate. The surface pressure release roller lever 60 is integrally attached and fixed to a roller shaft 64 extending in a direction orthogonal to the direction of slide movement of the slider case 42. Two surface pressure release roller levers 60 are provided on the roller shaft 64. The surface pressure load roller lever 62 is integrally fixed to the above-mentioned roller shaft 66 extending in the orthogonal direction. Two surface pressure load roller levers 62 are provided on the roller shaft 66.

The

roller shafts

64 and 66 are each pivotally supported on the side surface of the bottom plate 46. The roller support of the roller shaft 64 to the bottom plate 46 is performed at a position where the slider shaft 42 abuts on the surface pressure release roller lever 60 when the surface pressure release position C is reached. The surface pressure release roller lever 60 is rotatable around the axis of the roller shaft 64. Further, the support of the roller shaft 66 to the bottom plate 46 is performed at a position where the slider case 42 abuts on the surface pressure load roller lever 62 when the slider case 42 reaches the end position opposite to the surface pressure release position C. . The surface pressure load roller lever 62 is rotatable about the axis of the roller shaft 66.

At the end of the sliding direction of the slider case 42,

contact portions

68 and 70 are provided. The contact portion 68 is a surface provided at one end of the slider case 42. The contact portion 70 is a surface provided at the other end of the slider case 42. The contact portion 68 is a pressing portion that contacts the surface pressure release roller lever 60 provided on the roller shaft 64 and presses the surface pressure release roller lever 60. The contact portion 70 is a pressing portion that contacts the surface pressure load roller lever 62 provided on the roller shaft 66 and presses the surface pressure load roller lever 62.

The surface pressure release roller lever 60 and the surface pressure load roller lever 62 are connected to each other via a link 72. The links 72 are provided on both end sides in the orthogonal direction orthogonal to the direction of sliding movement of the slider case 42. Each link 72 extends in the sliding direction of the slider case 42. Both ends in the sliding direction of each link 72 are pivotally supported on the side surface of the bottom plate 46 at the same position as the pivotally supported position of the

roller shafts

64 and 66. The surface pressure release roller lever 60 and the surface pressure load roller lever 62 interlock with each other via the link 72 and rotate.

The surface pressure load mechanism 40 also has a cam 74. Two cams 74 are provided for each link 72. Each cam 74 is a member formed in a convex shape so that a part of the outer periphery has a long outer diameter (long diameter) compared to other portions. The cam 74 is pivotally supported on the side surface of the bottom plate 46. The two cams 74 of each link 72 are arranged side by side in the sliding direction of the slider case 42. Each cam 74 is integrally connected to the link 72, and is connected to the roller levers 60 and 62 via the link 72. Each cam 74 rotates by the action of the link 72 as the roller levers 60 and 62 rotate.

The surface pressure load mechanism 40 also has a spring box 76 and a toggle hook bar 78. The spring box 76 and the toggle hook bar 78 are provided for each link 72. The spring box 76 of each link 72 is rotatably supported by the mounting plate 24 about the hinge pin 80. The hinge pin 80 has an axis extending in the sliding direction of the slider case 42.

Each spring box 76 contains a plurality of springs 82. Each spring box 76 is formed in a box shape so as to be able to accommodate a plurality of springs 82. The plurality of springs 82 are arranged in parallel in the spring box 76. The spring 82 is an elastic body capable of generating a spring force for applying a surface pressure between the fixed plate 20 and the slide plate 22.

Each spring box 76 is capable of pivoting relative to the mounting plate 24 about the hinge pin 80 while accommodating the spring 82. The rotation of the spring box 76 is performed between the state in which the spring 82 extends in the vertical direction (i.e., the closed state) and the state in which the spring 82 extends in the substantially horizontal direction (i.e., the open state). The spring box 76 is in a position where the slide plate 22 is not removed from the slider case 42 in the closed state. In the open state, the spring box 76 is in a position where the slide plate 22 can be removed from the slider case 42.

The rotation of the spring box 76 is preferably performed so as not to interfere with the rotation of the bottom plate 46. For example, the pivoting of the spring box 76 from the closed state to the open state may not be realized unless the bottom plate 46 is in the closed state, that is, before it is pivoted to the open state.

Each spring box 76 is composed of a fixed portion 84 to which one end of the spring 82 is fixed and a plate-like movable portion 86 to which the other end of the spring 82 is fixed. The spring box 76 is rotatably supported by the mounting plate 24 on the side of the fixing portion 84 about the hinge pin 80. The movable portion 86 can be slightly displaced relative to the fixed portion 84 in the direction in which the spring 82 expands and contracts. A spring force generated by a spring 82 can act between the fixed portion 84 and the movable portion 86.

The toggle hook bar 78 is connected to the movable portion 86 via the support bar 88. The toggle hook bar 78 is disposed on the opposite side of the fixed portion 84 to the movable portion 86. The support bars 88 are attached one by one to both ends of the movable portion 86 in the sliding direction of the slider case 42, and extend through the fixed portion 84 in the expansion and contraction direction of the spring 82. The toggle hook bars 78 are attached to their support bars 88 so as to connect the two support bars 88 at both ends in the sliding direction. The toggle hook bar 78 is a rod-like member extending in the sliding direction of the slider case 42, and can be displaced in the expansion and contraction direction of the spring 82.

The above-mentioned cam 74 pivotally supported by the bottom plate 46 can be engaged with the toggle hook bar 78 which is displaceably attached to the bottom plate 46 side. The engagement of the cam 74 with the toggle hook bar 78 is released when the slider case 42 is rotated by reaching the surface pressure release position C and pressing the roller lever 60, and the slider case 42 is loaded with the surface pressure. This is realized in the case of reaching the position D and being rotated by pressing the surface pressure load roller lever 62.

When the cam 74 is not engaged with the toggle hook bar 78, the cam 74 does not act to displace the toggle hook bar 78 in the contracting direction of the spring 82, and the spring 82 is maintained in a normal state. In this case, no surface pressure is applied between the fixed plate 20 and the slide plate 22. On the other hand, when the cam 74 is engaged with the toggle hook bar 78, the cam 74 acts to displace the toggle hook bar 78 in the contracting direction of the spring 82, and the spring 82 is contracted. In this case, surface pressure is applied between the fixed plate 20 and the slide plate 22.

A stopper plate 90 is movably supported by the bottom plate 46. The stopper plate 90 is a plate-like member extending in the sliding direction of the slider case 42. The stopper plates 90 are provided on both end sides of the slider case 42 in the orthogonal direction orthogonal to the sliding direction. Each stopper plate 90 is supported so as to be movable to the bottom plate 46, specifically, pivotable about the same axis as one of the two cams 74.

The stopper plate 90 is provided to allow / regulate rotation of the spring box 76 about the hinge pin 80, specifically, between the closed state of the spring box 76 and the opened state of the spring box 76. It is done. When the spring box 76 is in the closed state, the stopper plate 90 is pushed down to a position where it is hooked on the toggle hook bar 78 corresponding to the spring box 76. The stopper plate 90 restricts the rotation of the spring box 76 by being in the hooking position on the toggle hook bar 78. The stopper plate 90 permits rotation of the spring box 76 when the operator is rotated from the above-described rotation restricted state to a position where the toggle hook bar 78 is not caught.

Next, the operation of the surface pressure load mechanism 40 provided in the sliding gate 10 of the present embodiment will be described.

When the sliding movement of the slide plate 22 by the sliding device 30 is restricted within the normal sliding range between the pouring position A and the pouring stop position B during normal operation of the sliding gate 10, the surface pressure load mechanism The surface load 40 applies a surface pressure between the fixed plate 20 and the slide plate 22. The surface pressure load by the surface pressure load mechanism 40 is realized by sliding the slider case 42 to the surface pressure load position D by the slide device 30.

Specifically, when the slider case 42 is slidingly moved to the surface pressure load position D, the contact portion 70 is engaged with and brought into contact with the surface pressure load roller lever 62 and the surface pressure load roller lever 62 Press and rotate. In this case, with the rotation of the surface pressure load roller lever 62, the link 72 operates to rotate the cam 74, and the major diameter portion of the cam 74 engages with the toggle hook bar 78 and the toggle hook bar 78 is a spring box. Push down against 76. When such depression is performed, the above-described surface pressure is loaded by the generation of a spring force due to the contraction of the spring 82.

When such a surface pressure load is realized, the stopper block 54 of the stopper mechanism 52 is moved forward to the abuttable position. When the stopper block 54 is in the abutable position, the sliding movement of the slider case 42 is restricted to a range until it abuts on the stopper block 54, so sliding movement beyond the normal sliding range of the slider case 42 is prohibited Be done. For this reason, after the above-described surface pressure load is realized, the slide plate 22 is slid within the normal sliding range between the pouring position A and the pouring stop position B during normal operation of the sliding gate 10. In this case, the surface pressure load between the fixed plate 20 and the slide plate 22 is maintained.

When replacement of the fixed plate 20 and the slide plate 22 is required from the state of such surface pressure load, it is necessary to release the surface pressure load by the surface pressure load mechanism 40 in order to realize the replacement. The surface pressure load mechanism 40 releases the surface pressure load between the fixed plate 20 and the slide plate 22 according to the replacement request.

Specifically, after the above replacement request, first, the cotter pin 57 attached to the lever 56, the safety pin 58, etc. are removed to allow the lever 56 of the stopper mechanism 52 to be turned manually by the operator's manual operation. After that, the stopper block 54 is moved backward to the non-contacting position by rotating the lever 56. When the stopper block 54 is moved backward to the non-contacting position, sliding movement beyond the normal sliding range of the slider case 42 is permitted. Then, when the stopper block 54 is moved backward to the non-contacting position, next, the slider case 42 is slid by the slide device 30 to the surface pressure release position C beyond the normal slide range.

When the slider case 42 reaches the surface pressure release position C, the contact portion 68 is engaged with and brought into contact with the surface pressure release roller lever 60 to press and rotate the roller lever 60. In this case, with the rotation of the surface pressure release roller lever 60, the link 72 operates to rotate the cam 74, and the engagement of the cam 74 with the toggle hook bar 78 is released, and the toggle hook bar 78 is a spring box. It is pulled up against 76 and lifted up. When such lifting is performed, the spring force due to the contraction of the spring 82 disappears, and the above-described surface pressure load is released.

As described above, when the surface pressure load between the fixed plate 20 and the slide plate 22 is released, the stopper plate 90 is then pivoted to a position where the stopper plate 90 is not caught by the toggle hook bar 78 by the manual operation of the operator. When such rotation is realized, the rotation of the spring box 76 is permitted. When the stopper plate 90 is pivoted to a position where it is not caught on the toggle hook bar 78, the spring box 76 is then pivoted from the closed state to the open state by the manual operation of the operator. When the spring box 76 is turned to the open state, the bottom plate 46 is then turned from the closed state to the open state by the manual operation of the operator.

When the bottom plate 46 is pivoted to the open state, the bottom plate 46 and the mounting plate 24 are largely separated, so the slide plate 22 of the slider case 42 held by the bottom plate 46, and the mounting plate 24. It is possible to detach the fixed plates 20 held by the two, and to replace the

plates

20 and 22.

Then, after the

plates

20 and 22 are replaced as described above, surface pressure is applied between the fixed plate 20 and the slide plate 22 in a procedure reverse to the above procedure. Specifically, after the

plates

20 and 22 are replaced, the bottom plate 46 is pivoted from the open state to the closed state, and thereafter, the spring in a state where the stopper plate 90 is pivoted to a position where it is not caught by the toggle hook bar 78 The box 76 is pivoted from the open state to the closed state. Then, the stopper plate 90 is rotated to a point where it is hooked on the toggle hook bar 78. In this case, rotation of the spring box 76 to the open state is prohibited. When each of the bottom plate 46 and the spring box is turned to the closed state as described above, next, the surface pressure load mechanism 40 loads surface pressure between the fixed plate 20 and the slide plate 22.

Specifically, the slider case 42 is slid to the surface pressure load position D by the slide device 30. When the slide movement is performed, the slider case 42 rotates the surface pressure load roller lever 62, and the cam 74 is rotated by the operation of the link 72, and the major diameter portion thereof engages with the toggle hook bar 78. In such an engaged state, the toggle hook bar 78 pushes down against the spring box 76, so that a spring force is generated due to the contraction of the spring 82 to apply the above-mentioned surface pressure.

After the surface pressure is applied, the lever 56 of the stopper mechanism 52 is rotated by the manual operation of the operator, whereby the stopper block 54 is moved forward to the abuttable position, and thereafter the cotter pin 57 or the safety of the lever 56 Pins 58 etc. are attached. When the stopper block 54 is moved forward to the abuttable position, the slide movement of the slider case 42 is restricted to a range until it abuts on the stopper block 54, so that the slide beyond the normal slide range of the slider case 42 Movement is prohibited.

As described above, in the sliding gate 10 of the present embodiment, when the stopper block 54 of the stopper mechanism 52 is in the contactable position by the forward movement accompanying the operation of the lever 56, the sliding movement of the slider case 42 by the sliding device 30 is Normally, the slider case 42 can be inhibited from reaching the surface pressure release position C by restricting it within the sliding range. In this case, while the desired surface pressure is applied between the fixed plate 20 of the mounting plate 24 and the slide plate 22 of the bottom plate 46 in the sliding gate 10, the slider case 42 is within the normal sliding range by the slide device 30. The sliding movement is performed to control the opening and closing of the outlet 28 of the upper nozzle 18.

On the other hand, when the stopper block 54 is in the non-contacting position due to the backward movement caused by the operation of the lever 56, the slide range of the slider case 42 by the slide device 30 is made wider than the normal slide range and exceeds the normal slide range. The slide movement can be permitted, and the slider case 42 can be allowed to reach the surface pressure release position C. Then, when the slider case 42 is slid beyond the normal slide range by the slide device 30 and reaches the surface pressure release position C, the surface between the fixed plate 20 of the mounting plate 24 and the slide plate 22 of the bottom plate 46 The pressure load can be released.

Accordingly, with the surface pressure applied between the fixed plate 20 and the slide plate 22, the opening and closing of the outlet of the upper nozzle 18 accompanied by the sliding movement within the normal sliding range of the slider case 42 and the release of the surface pressure load Can be realized by the slide movement of the slider case 42 by the same slide device 30. That is, if the slide movement is regulated within the normal slide range, the nozzle outlet can be opened and closed, and if the slide movement beyond the normal slide range is allowed, the above-mentioned surface pressure load can be released. . Therefore, the opening and closing of the nozzle outlet and the release of the surface pressure load can be realized with a simple configuration as a whole.

Further, in the sliding gate 10 of the present embodiment, the range switching of the sliding movement of the slider case 42 by the sliding device 30 can be performed by contacting the stopper block 54 of the stopper mechanism 52 between the contactable position and the noncontacting position by operating the lever 56. This is achieved by switching between positions and switching whether or not the slider case 42 can contact the stopper block 54.

Specifically, when the stopper block 54 is in the abutable position, even if the slider case 42 tries to slide and move beyond the normal sliding range, the slider case by the sliding device 30 is abutted by abutting on the stopper block 54. The 42 slide movements are normally restricted within the slide range, and slide movements beyond the normal slide range are prohibited. On the other hand, when the stopper block 54 is in the non-contacting position, the slider case 42 does not contact the stopper block 54 when attempting to slide past the normal sliding range, so the normal sliding range of the slider case 42 Slide movement beyond is acceptable.

The movement (in particular, the backward movement) of the stopper block 54 is realized by removing the safety pin 58 or the like from the lever 56 and manually rotating the lever 56 after the removal. For this reason, in order to realize the switching of the sliding range of the slider case 42 accompanying the movement of the stopper block 54 and hence the stopper block 54, it is sufficient to move the stopper block 54 by the turning operation of the lever 56, The work load is reduced. Further, in order to realize the movement of the stopper block 54 and thus the switching of the sliding range of the slider case 42, it is not necessary to provide a separate surface pressure load / release tool, so cost reduction and work load reduction are achieved. It is designed.

Further, if the safety pin 58 or the like is not removed from the lever 56, or if the lever 56 is not rotated in the direction to retract the stopper block 54, the stopper block 54 is not retracted and the slider case 42 has a surface pressure. It does not reach the release position C. Also, when the surface pressure is loaded between the fixed plate 20 and the slide plate 22, the stopper block 54 is moved backward and the slider case 42 reaches the surface pressure release position C beyond the normal sliding range. As long as the surface pressure load is released. Therefore, the release of the surface pressure load between the fixed plate 20 and the slide plate 22 can be reliably prevented from being performed during the opening and closing control of the nozzle outlet.

Therefore, according to the sliding gate 10 of the present embodiment, while the opening and closing of the nozzle outlet and the release of the surface pressure load are realized by the slide movement by the same slide device 30 with a simple configuration, the surface pressure load is released by It is possible to reliably avoid what happens during the opening and closing control of the outlet.

By the way, in the above embodiment, the hinge pin 80 is in the “first position” where the contactable position is described in the claims, and in the “second position” where the non-contacting positions are in the claims. In the "first pivoting mechanism" described in the claims, the "stopper member" in which the stopper plate 90 is claimed in the "second pivoting mechanism" in which the hinge pin 50 is recited in the claims To each.

The present invention is not limited to the above-described embodiment and modifications, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 sliding gate 12 molten steel container 18 upper nozzle 20 fixed plate 22 slide plate 24 mounting plate 28 outlet 30 slide apparatus 40 surface pressure load mechanism 42 slider case 46

bottom plate

50, 80 hinge pin 52 stopper mechanism 54 stopper block 56 lever 60 surface pressure Roller lever for release 62 Roller lever for

surface pressure load

64, 66 Roller shaft 72 Link 74 Cam 76 Spring box 78 Toggle hook bar 82 Spring 90 Stopper plate

Claims

A fixed plate attached and fixed to the nozzle outlet of the molten steel container;
A slide plate slidingly moving relative to the fixed plate for opening and closing the nozzle outlet;
A slide device for sliding a slider case in which the slide plate is detachably held in the opening and closing direction of the nozzle outlet;
When the slide movement of the slider case by the slide device is regulated within a normal slide range, a surface pressure is applied between the fixed plate and the slide plate, while the slide case of the slider case by the slide device A surface pressure load mechanism that releases the load of the surface pressure when slide movement beyond the normal slide range is permitted;
A stopper mechanism which is moved so as to selectively switch between a state in which the slide movement of the slider case is restricted within the normal slide range and a state in which the slide movement of the slider case beyond the normal slide range is permitted;
A sliding gate characterized by comprising:
The stopper mechanism restricts the sliding movement of the slider case within the normal sliding range to inhibit sliding movement of the slider case beyond the normal sliding range, and the normal sliding range of the slider case The sliding gate according to claim 1, wherein the sliding gate is moved to a second position different from the first position for permitting sliding movement beyond.
The stopper mechanism may be moved between the first position and the second position, and may be in contact with the slider case, and the stopper block may be positioned between the first position and the second position. 3. A sliding gate according to claim 2, further comprising: a lever for moving the position of the sliding gate.
The surface pressure load mechanism includes a roller lever that rotates in a releasing direction by being pressed by the slider case when the slider case is slid and moved beyond the normal slide range by the slide device; A cam connected via a link and rotating in the releasing direction as the roller lever rotates in the releasing direction, and the load of the surface pressure is released by the rotation of the cam in the releasing direction A sliding gate according to any one of the preceding claims, characterized in that:
The surface pressure load mechanism generates a spring force for applying a surface pressure between the fixed plate and the slide plate when the rotational position of the cam is a predetermined rotational position, and the cam release direction 5. The sliding gate according to claim 4, further comprising a spring whose generation of the spring force is released by the rotation thereof, wherein the load of the surface pressure is released by releasing the generation of the spring force by the spring.
A mounting plate for releasably holding the fixing plate and rotatably supporting a spring box accommodating the spring;
A bottom plate rotatably supported by the mounting plate and slidably holding the slider case;
A first rotation mechanism for rotating the spring box between a first predetermined prohibition position where the slide plate is prohibited from being removed from the slider case and a first predetermined possible position where the slide plate can be removed;
A second rotation mechanism configured to rotate the bottom plate between a second predetermined prohibition position where the slide plate is prohibited from being removed from the slider case and a second predetermined possible position where the slide plate can be removed;
The sliding gate according to claim 5, comprising:
The bottom plate includes a stopper member movably supported by the bottom plate for permitting / regulating rotation of the spring box from the first predetermined prohibition position to the first predetermined possible position by the first rotation mechanism. The sliding gate according to claim 6, characterized in that: