JP2009068044A - Snout supporting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a snout supporting device where the change of the inclination angle of a snout upon fitting caused by thermal expansion is prevented, and the grasping of the position of the tip part of the snout is possible. <P>SOLUTION: In the snout supporting device 10 where, regarding a snout 12 in which the upper end part is connected to the outlet side of a continuous annealing furnace 11, in such a manner that the lower part side of the snout 12 is immersed into a hot dip metal plating bath 13 at a prescribed tilted angle θ, the upper part side of the snout 12 is held, the device comprises: a guide frame 14 in which the upper part is pin-supported to the upper part of the snout 12, and which is supported in such a manner that an angle formed with a horizontal face is made into the tilted angle θ; and a snout fitting means 15 fitting the snout 12 to the guide frame 14 while it is freely expanded and contracted in the longitudinal direction thereof in accordance with the temperature variation of the snout 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a support device for a snout that prevents a change in an inclination angle during mounting due to thermal expansion of the snout.

Conventionally, in a continuous molten metal plating apparatus, in order to prevent the steel plate processed in the continuous annealing furnace from being oxidized by the outside air before entering the molten metal plating bath (plating pot), the continuous annealing furnace outlet side A duct-shaped snout is provided between the molten metal plating bath. Here, the snout is connected to the continuous annealing furnace outlet side via a bellows, the upper part of the snout is rotatably supported by a fulcrum pin, and the side part of the snout is adjusted for the inclination angle when the snout is attached. It is supported through an angle adjusting means for performing (see, for example, Patent Document 1).

JP-A-3-134146

When a snout is installed between the outlet side of the continuous annealing furnace and the molten metal plating bath and the continuous molten metal plating process is started, the temperature of the snout and the angle adjusting means gradually rises. Therefore, the snout rotates around the fulcrum pin due to the thermal expansion generated in the snout. As a result, the tip of the snout moves in the molten metal plating bath, and the amount of horizontal movement of the tip of the snout can reach as much as 100 mm. On the other hand, mechanical parts are densely packed around the molten metal plating bath, and positioning of the tip side of the snout is important. If the position of the tip side changes due to the thermal expansion of the snout, the allowable positioning width of the machine parts around the molten metal plating bath is reduced, and in particular, it is provided adjacent to the steel plate passing through the inside of the tip of the snout. There is a problem that the positioning of the snout pump is very difficult. Here, it is conceivable that the angle adjustment means that adjusts the inclination angle during the installation of the snout may be used to restore the original installation angle of the snout that has changed due to thermal expansion. This is very complicated. Although it is possible to provide an automatic adjustment mechanism that automatically detects the temperature change of the snout and operates the angle adjustment means so that the inclination angle of the snout does not change, it is always possible to secure an installation space for the automatic adjustment mechanism Not limited, there is a problem that the equipment cost increases.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a support device for a snout capable of preventing a change in an inclination angle during mounting due to thermal expansion of the snout and capable of grasping the position of the tip of the snout. .

The snout support device according to the first aspect of the present invention that meets the above-mentioned object is provided with a snout whose upper end is connected to the outlet side of the continuous annealing furnace so that the lower side of the snout is immersed in a molten metal plating bath at a predetermined inclination angle. In the support device of the snout that holds the snout,
A guide frame whose upper part is pin-supported on the upper part of the snout and supported so that an angle formed with a horizontal plane is the inclination angle;
Snout mounting means for mounting the snout on the guide frame while freely expanding and contracting in the longitudinal direction according to the temperature variation of the snout.

In the snout support device according to the first aspect of the present invention, the snout mounting means includes a wheel provided on an upper side of the snout, and the wheel provided so that an angle formed with a horizontal plane of the guide frame is the inclination angle. It can be set as the structure which has a rail which supports and moves.
In the snout support device according to the first aspect of the present invention, the snout mounting means may include a wheel provided on the guide frame and abutting on the upper side of the snout from below to support the snout.

The snout support device according to the second invention that meets the above-mentioned object is such that the upper part is pin-supported and connected to the outlet side of the continuous annealing furnace, and the lower part is immersed in a molten metal plating bath at a predetermined inclination angle. In the support device of the snout that holds the snout,
The snout is supported so as to be freely expandable and contractable in the longitudinal direction according to the temperature variation of the snout, and has a snout support means for adjusting an angle formed with a horizontal plane to be the inclination angle.

In the snout support apparatus according to the second invention, the snout support means includes a wheel that contacts the snout from below and supports the snout, and a lifting mechanism that adjusts the height position of the wheel. can do.
In the snout support device according to the second invention, the snout support means includes a rail provided on a side portion of the snout in parallel with the longitudinal direction of the snout, and a wheel that moves in contact with the rail from below. In addition, it may be configured to have a lifting mechanism for adjusting the height position of the wheel.

In the support device of the snout according to claims 1 to 6, since the snout is freely expanded and contracted in the longitudinal direction according to the temperature fluctuation of the snout to prevent the change of the inclination angle, the temperature of the snout changes during operation. However, it is possible to prevent the snout from interfering with the machine parts around the molten metal plating bath. Further, since the thermal expansion of the snout appears only in the longitudinal direction, the position of the tip of the snout can be easily grasped.For example, as the sink roll diameter in the molten metal plating bath decreases, the snout is separated from the mechanical parts around the molten metal plating bath. The approach angle of the snout is adjusted so as not to interfere, and the steel plate can pass on the axis of the snout.
In particular, since the support device for a snout according to claims 2 to 6 has a simple configuration, the equipment cost can be reduced and the maintenance burden can be reduced.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a side view of the support device for a snout according to the first embodiment of the present invention, FIG. 2 (A) is a partially omitted front view of the support device for the snout, and FIG. FIG. 3 is a side view of the snout support device according to the second embodiment of the present invention, and FIG. 4 is a side view of the snout support device according to the third embodiment of the present invention. FIG. 5A is a side view of a snout support device according to a fourth embodiment of the present invention, FIG. 5B is a cross-sectional view taken along the line Q-Q of FIG. It is a side view of the support apparatus of the snout which concerns on 5th Embodiment.

As shown in FIG. 1, the snout support device 10 according to the first embodiment of the present invention includes a snout 12 whose upper end is connected to the outlet side of the continuous annealing furnace 11, and a lower side of the snout 12 is a molten metal plating bath. 13, the upper part of the snout 12 is held so as to be immersed at a predetermined inclination angle θ, that is, an inclination angle set when the snout 12 is attached. Then, the snout support device 10 is pin-supported at the top of the snout 12 and supported so that the angle formed with the horizontal plane becomes the inclination angle θ, and the snout 12 is attached to the guide frame 14 by the snout 12. Snout attachment means 15 is provided for attachment while freely expanding and contracting in the longitudinal direction in accordance with temperature fluctuations. This will be described in detail below.

Here, the snout 12 has, for example, a rectangular upper cylindrical body 16 in cross-sectional view, and a rectangular lower cylindrical body 17 in a cross-sectional view with a flange connected to the upper cylindrical body 16. Then, the upper part of the upper cylindrical body 16 is connected to the outlet 19 of the continuous annealing furnace 11 through the metal bellows 18, and a snout tip hardware 20 is externally attached to the lower part of the lower cylindrical body 17, and the tip side of the snout tip hardware 20 is melted. It is immersed in the metal plating bath 13.

As shown in FIGS. 2A and 2B, the guide frame 14 is provided, for example, so as to protrude from the side plate members 21 and 22 disposed on both sides of the upper cylindrical body 16 and the lower side of the side plate members 21 and 22. Arm member 23 (in FIG. 2A, illustration of the arm member 23 is omitted). Further, the guide frame 14 includes an upper shaft 26 that is an example of a pin member that penetrates through attachment members 24 and 25 provided on both sides of the upper side of the upper cylindrical body 16 and is fitted to the side plate members 21 and 22 at both ends. Have. The upper shaft 26 is supported by bearings 27 and 28 provided between the mounting member 24 and the side plate member 21 and between the mounting member 25 and the side plate member 22, respectively. The bearings 27 and 28 are, for example, continuously annealed. It is attached to a beam member 29 constituting the equipment frame of the furnace 11. Further, between the arm member 23 and the beam member 29, it is an example of an angle adjusting mechanism that determines the mounting angle of the snout 12 so that the lower side of the snout 12 is immersed in the molten metal plating bath 13 at a predetermined inclination angle θ. A turnbuckle 30 is attached using a universal joint 31.

The snout mounting means 15 is provided on wheels 32 and 33 provided on both sides of the upper side of the snout 12 and side plates 21 and 22 of the guide frame 14 and supports and moves the wheels 32 and 33, respectively. The first rail 34 and the second rail 35 disposed in parallel with the first rail 34 so as to sandwich the wheels 32 and 33 together with the first rail 34 from the radial direction. , 33 are arranged with a slight gap between the first rail 34 and the second rail 35. Here, the wheels 32 and 33 are provided at both ends of the lower shaft 38 supported on both sides by attachment members 36 and 37 provided on both sides on the lower side of the upper cylindrical body 16. Further, when the wheels 32 and 33 are supported by the first rail 34, they are orthogonal to the axis of the upper shaft 26 and the axis of the lower shaft 38, and the axis of the upper shaft 26 and the axis of the lower shaft 38. The first rail 34 is provided on the side plate members 21 and 22, respectively, with the mounting position thereof adjusted so that the line segment connecting the two and the axis of the snout 12 are parallel to each other. The upper side of the snout 12 can be held by supporting the wheels 32 and 33 with the first rail 34.

With the above-described configuration, the guide frame 14 can be provided with the upper portion thereof pin-supported on the upper portion of the snout 12. Further, by operating the turnbuckle 30 and changing its length, the distance between the arm member 23 and the beam member 29 can be adjusted, the guide frame 14 can be tilted with the upper shaft 26 as a fulcrum, and the guide frame 14 The angle formed between the axial center and the horizontal plane can be adjusted to the inclination angle θ when the snout 12 is attached. Since the line connecting the axis of the upper shaft 26 and the axis of the lower shaft 38 and the axis of the snout 12 are parallel, adjusting the angle between the axis of the guide frame 14 and the horizontal plane to the inclination angle θ causes the snout. 12 can be arranged so that its lower side is immersed in the molten metal plating bath 13 at an inclination angle θ.

Next, the operation of the snout support device 10 according to the first embodiment of the present invention will be described.
As shown in FIG. 1, the angle adjustment is performed at room temperature so that the upper end portion is connected to the outlet side of the continuous annealing furnace 11 and the lower side is immersed in the molten metal plating bath 13 at an inclination angle θ using the support device 10 of the snout. Hold the snout 12. Then, the steel plate 40 is introduced into the molten metal plating bath 13 via the snout 12 via the turn-down roll 39 disposed on the outlet side of the continuous annealing furnace 11, and the sink provided in the molten metal plating bath 13. The plating process of changing the transfer direction with the roll 41 to a plating machine (not shown) is started. Here, when the plating process is started, the heated steel plate 40 that has passed through the continuous annealing furnace 11 passes through the snout 12, and the lower side of the snout 12 is heated by the heat from the molten metal plating bath 13. Therefore, the temperature of the snout 12 increases gradually.

Here, in the snout 12, the upper part of the upper cylindrical body 16 of the snout 12 is pin-supported on the upper part of the guide frame 14, and the lower side of the upper cylindrical body 16 is provided in the guide frame 14 via the wheels 32 and 33. Supported by rails 34. Therefore, when a longitudinal temperature distribution is formed in the snout 12 and the longitudinal expansion occurs in the snout 12, the expansion of the snout 12 is caused by the snout 12 via the wheels 32, 33. It is absorbed by the linear motion that moves up. Since the first rail 34 is attached to the guide frame 14 such that the angle formed with the horizontal plane is the inclination angle θ, the inclination angle θ of the snout 12 does not change even if the snout 12 is thermally expanded. . Further, when the operating temperature of the continuous annealing furnace 11 is lowered or the operating temperature of the molten metal plating bath 13 is lowered, the temperature of the snout 12 is lowered and the snout 12 contracts in the longitudinal direction. The contraction is absorbed by the linear motion in which the snout 12 moves on the first rail 34 via the wheels 32 and 33, and even if the snout 12 contracts, the inclination angle θ of the snout 12 does not change.

As shown in FIG. 3, the snout support device 42 according to the second embodiment of the present invention has a side plate member 44 of the guide frame 43 as compared with the snout support device 10 according to the first embodiment. The turnbuckle 48 can be freely provided between the lower surface of the arm member 46 projecting from the lower side of 45 and the support member 47 erected on the installation base (not shown) of the equipment frame of the continuous annealing furnace 11. It is characterized by being attached using a joint 49. For this reason, the same code | symbol is attached | subjected to the same structural member and description is abbreviate | omitted. By providing the turnbuckle 48 between the arm member 46 and the support member 47, the inclination angle θ of the snout 12 can be easily adjusted. The operation of the snout support device 42 is the same as the operation of the snout support device 10, and thus the description thereof is omitted.

As shown in FIG. 4, the snout support device 50 according to the third embodiment of the present invention has a configuration of the snout mounting means 51 as compared with the snout support device 42 according to the second embodiment. It is different. For this reason, only the snout attachment means 51 will be described, and the same components as those of the snout support device 42 will be denoted by the same reference numerals and description thereof will be omitted.
The snout attachment means 51 is provided on the side plate members 44 and 45 of the guide frame 43 via attachment bases 52, respectively, and is a wheel that supports the upper cylinder 16 by contacting the upper side of the snout 12, that is, the upper cylinder 16 from below. 53. As a result, the upper cylinder 16 can be supported by the upper shaft 26 and the wheel 53, and the turnbuckle 48 provided between the arm member 46 and the support member 47 is operated to adjust the mounting angle of the upper cylinder 16. Thus, the snout 12 can be installed at the inclination angle θ.

Next, the operation of the snout support apparatus 50 according to the third embodiment of the present invention will be described.
As shown in FIG. 4, the angle adjustment is performed at room temperature so that the upper end portion is connected to the outlet side of the continuous annealing furnace 11 and the lower side is immersed in the molten metal plating bath 13 at an inclination angle θ using the support device 50 of the snout. Hold the snout 12. When the plating process of the steel plate 40 is started, a temperature distribution that changes in the longitudinal direction is formed in the snout 12, and the snout 12 expands in the longitudinal direction. Here, since the snout 12 is supported by the upper shaft 26 and the wheel 53, the snout 12 can freely expand in the longitudinal direction thereof. For this reason, even if the snout 12 expands, the inclination angle θ of the snout 12 does not change. Further, when the operating conditions of the plating process are changed and the temperature of the snout 12 is lowered and the snout 12 is contracted in the longitudinal direction, the snout 12 can be freely contracted in the longitudinal direction. Therefore, the inclination angle θ of the snout 12 is It does not change.

As shown in FIGS. 5 (A) and 5 (B), the snout support device 54 according to the fourth embodiment of the present invention is pin-supported at the top and is connected to the metal bellows 18 at the outlet 19 of the continuous annealing furnace 11. Is held so that the lower side of the snout 12 is immersed in the molten metal plating bath 13 at a predetermined inclination angle θ, and the snout 12 is moved in the longitudinal direction according to the temperature variation of the snout 12. It has a snout support means 55 that supports it so that it can freely expand and contract, and adjusts the angle formed with the horizontal plane to the inclination angle θ. This will be described in detail below.

Support members (not shown) having insertion holes in the center are provided on both sides of the upper side of the snout 12, and a shaft 59 is inserted through the support members. Both sides of the shaft 59 are supported by bearings 60, and the bearings 60 are attached to a frame beam 61 that constitutes the equipment frame of the continuous annealing furnace 11. Thereby, it can connect with the exit side of the continuous annealing furnace 11 in the state which pin-supported the upper part of the snout 12. FIG.

The snout support means 55 includes, for example, rails 62 and 63 provided on the both sides of the snout 12 in parallel with the longitudinal direction of the snout 12, respectively, and wheels 64 and 65 that move in contact with the rails 62 and 63 from below. And an elevating mechanism 66 that adjusts the height positions of the wheels 64 and 65, respectively. Here, the elevating mechanism 66 includes an arm member 68 that is pivotally connected to the lower portion of the frame beam material 61 constituting the equipment frame of the continuous annealing furnace 11 using a pin 67, and a length adjusting member to the arm member 68. And a wheel support member 70 which is connected via a turnbuckle 69, which is an example, and has wheels 64 and 65 rotatably attached to the tip. With this configuration, the wheels 64 and 65 are brought into contact with the rails 62 and 63 from below, and the turnbuckle 69 is operated to adjust the height positions of the wheels 64 and 65 with respect to the lower surface of the frame beam 61. By doing so, the snout 12 can be tilted about the shaft 59 as a fulcrum, and the angle formed by the axis of the snout 12 and the horizontal plane can be matched with the tilt angle θ when the snout 12 is attached.

Next, the operation of the snout support device 54 according to the fourth embodiment of the present invention will be described.
As shown in FIGS. 5A and 5B, the upper part is connected to the exit side of the continuous annealing furnace 11 using the support device 54 of the snout, and the lower part is immersed in the molten metal plating bath 13 at an inclination angle θ. The angle is adjusted at normal temperature so that the snout 12 is held. Then, when the steel plate 40 processed in the continuous annealing furnace 11 enters the molten metal plating bath 13 via the snout 12 and starts the plating process, the temperature of the snout 12 gradually increases, A temperature distribution changing in the longitudinal direction is formed. For this reason, the snout 12 is expanded in the longitudinal direction, but the expansion of the snout 12 is absorbed by a linear motion in which the snout 12 moves while rotating the wheels 64 and 65 via the rails 62 and 63. For this reason, even if the snout 12 is thermally expanded, the inclination angle θ of the snout 12 does not change. Further, when the operating temperature of the continuous annealing furnace 11 is lowered or the operating temperature of the molten metal plating bath 13 is lowered, the temperature of the snout 12 is lowered and the snout 12 contracts in the longitudinal direction. The contraction is absorbed by a linear motion in which the snout 12 moves while rotating the wheels 64 and 65 via the rails 62 and 63, and even if the snout 12 contracts, the inclination angle θ of the snout 12 does not change.

As shown in FIG. 6, the snout support device 71 according to the fifth embodiment of the present invention is compared with the snout support device 54 according to the fourth embodiment of the present invention. This is characterized by a different configuration. For this reason, only the snout support means 72 will be described, and the same components are denoted by the same reference numerals and description thereof will be omitted.

The snout support means 72 includes a wheel 74 that supports the snout 12 by contacting a receiving plate 73 provided on each side of the outer wall of the snout 12, for example, and a lifting mechanism that adjusts the height position of the wheel 74. 75. Here, the elevating mechanism 75 is a turn that is an example of a length adjusting member provided in a standing state on a support base 76 that rotatably supports the wheels 74 and a base beam member 77 that constitutes a part of the base. A support member 79 that supports the support base 76 through the buckle 78 so as to be movable up and down, a guide member 80 that is provided on both sides of the support member 79 to prevent rolling when the support base 76 is raised and lowered, and the guide member 80 is attached to the base. And a frame 81 fixed to the beam member 77. By adopting such a configuration, the wheel 74 is brought into contact with the receiving plate 73 from below, and the turnbuckle 78 is operated to adjust the height position of the wheel 74, so that the snout 12 is supported on the shaft 59 as a fulcrum. The angle between the axis of the snout 12 and the horizontal plane can be adjusted to the inclination angle θ when the snout 12 is attached.

Next, the operation of the snout support device 71 according to the fifth embodiment of the present invention will be described.
As shown in FIG. 6, angle adjustment is performed at room temperature so that the upper part is connected to the outlet side of the continuous annealing furnace 11 and the lower side is immersed in the molten metal plating bath 13 at an inclination angle θ using the support device 71 of the snout. Hold the snout 12. Then, when the steel plate 40 processed in the continuous annealing furnace 11 enters the molten metal plating bath 13 via the snout 12 and starts the plating process, the temperature of the snout 12 gradually increases, A temperature distribution changing in the longitudinal direction is formed. For this reason, the snout 12 expands in the longitudinal direction. However, since the snout 12 is supported by the wheels 74 that contact from below through the receiving plate 73, the snout 12 can freely expand in the longitudinal direction. For this reason, even if the snout 12 is thermally expanded, the inclination angle θ of the snout 12 does not change. Further, when the operating temperature of the continuous annealing furnace 11 is lowered or the operating temperature of the molten metal plating bath 13 is lowered, the temperature of the snout 12 is lowered and the snout 12 contracts in the longitudinal direction. Since the snout 12 can freely contract in the longitudinal direction, even if the snout 12 contracts, the inclination angle θ of the snout 12 does not change.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, in the snout support device according to the third embodiment, rails parallel to the longitudinal direction are attached to both sides of the snout, and the wheels provided on the guide frame are brought into contact with the rail from below the snout. It can also be supported.
In the fifth embodiment, the snout is supported by the wheel via the receiving plate provided on the snout. However, the wheel can be supported by directly contacting the lower surface of the side of the snout.

It is a side view of the support device of a snout concerning a 1st embodiment of the present invention. (A) is a partially omitted front view of the support device of the same snout, (B) is a side view taken along the line PP of (A). It is a side view of the support apparatus of the snout which concerns on the 2nd Embodiment of this invention. It is a side view of the support apparatus of the snout which concerns on the 3rd Embodiment of this invention. (A) is a side view of a support device for a snout according to a fourth embodiment of the present invention, and (B) is a cross-sectional view taken along the line Q-Q of (A). It is a side view of the support apparatus of the snout which concerns on the 5th Embodiment of this invention.

Explanation of symbols

10: Snout support device, 11: Continuous annealing furnace, 12: Snout, 13: Molten metal plating bath, 14: Guide frame, 15: Snout mounting means, 16: Upper cylinder, 17: Lower cylinder, 18: Metal Bellows, 19: Exit, 20: Snout tip hardware, 21, 22: Side plate member, 23: Arm member, 24, 25: Mounting member, 26: Upper shaft, 27, 28: Bearing, 29: Beam member, 30: Turn Buckle, 31: Universal joint, 32, 33: Wheel, 34: First rail, 35: Second rail, 36, 37: Mounting member, 38: Lower shaft, 39: Turn-down roll, 40: Steel plate, 41 : Sink roll, 42: support device for snout, 43: guide frame, 44, 45: side plate member, 46: arm member, 47: support member, 48: turnbuckle, 49: universal joint 50: Snout support device, 51: Snout attachment means, 52: Mounting base, 53: Wheel, 54: Snout support device, 55: Snout support means, 59: Shaft, 60: Bearing, 61: Frame beam material, 62 63: Rail, 64, 65: Wheel, 66: Lifting mechanism, 67: Pin, 68: Arm member, 69: Turn buckle, 70: Wheel support member, 71: Snout support device, 72: Snout support means, 73 : Backing plate, 74: wheel, 75: lifting mechanism, 76: support base, 77: base beam material, 78: turnbuckle, 79: support member, 80: guide member, 81: frame

Claims (6)

In the snout support device for holding the snout so that the upper end of the snout is connected to the outlet side of the continuous annealing furnace and the lower side of the snout is immersed in a molten metal plating bath at a predetermined inclination angle.
A guide frame whose upper part is pin-supported on the upper part of the snout and supported so that an angle formed with a horizontal plane is the inclination angle;
Snout support means for attaching the snout to the guide frame while freely expanding and contracting the snout in the longitudinal direction in accordance with temperature fluctuations of the snout. The snout support device according to claim 1, wherein the snout mounting means is provided so that an angle formed between a wheel provided on an upper side of the snout and a horizontal plane of the guide frame is the inclination angle. A support device for snout, comprising: a rail to be supported and moved. 2. The snout support device according to claim 1, wherein the snout mounting means includes a wheel that is provided on the guide frame and that abuts on the upper side of the snout from below to support the snout. apparatus. In the support device of the snout where the upper part is pin-supported and connected to the outlet side of the continuous annealing furnace, and the lower part is immersed in a molten metal plating bath at a predetermined inclination angle, the snout is held.
The snout has a snout support means for supporting the snout so that it can freely expand and contract in the longitudinal direction according to the temperature variation of the snout, and adjusting the angle formed with the horizontal plane to be the inclination angle. Support device. 5. The snout support device according to claim 4, wherein the snout support means includes a wheel that contacts the snout from below and supports the snout, and an elevating mechanism that adjusts a height position of the wheel. Snout support device. The snout support device according to claim 4, wherein the snout support means includes a rail provided on a side portion of the snout parallel to the longitudinal direction of the snout, and a wheel that moves in contact with the rail from below. A snout support device comprising a lifting mechanism for adjusting a height position of the wheel.

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