JP6597466B2 - Shielding device for walking beam furnace - Google Patents

Description

  The present invention relates to a shielding device for a walking beam heating furnace.

  In a rolling process at a steel mill, a walking beam heating furnace is used that conveys a steel piece such as a slab while heating in a furnace chamber. In the walking beam heating furnace, in order to move the moving beam by a driving mechanism provided below the furnace chamber, an opening through which the moving beam post is inserted from the driving mechanism toward the furnace chamber is provided. For this reason, there exists a subject that the raise of the carbon dioxide concentration in a furnace chamber and the fall of the combustion efficiency by a heat loss arise through an opening part. Therefore, as disclosed in Patent Documents 1 and 2, it is known to provide a shielding device that shields the opening.

JP 2000-290722 A JP 55-85882 A

However, since the shielding device described in Patent Document 1 is provided in the furnace chamber, there is a problem that deformation and deterioration are likely to occur due to exposure to a high temperature atmosphere, and durability is inferior.
The shielding device described in Patent Document 2 has a problem in durability because of its complicated structure.

  The objective of this invention is providing the shielding apparatus which shields the opening part of the walking beam type heating furnace which can improve durability.

  The shielding device for the walking beam type heating furnace of the present invention is a shielding device that communicates with the furnace chamber of the walking beam type heating furnace and shields the opening through which the moving beam is inserted. A first shielding plate provided below and fixed to the opening; and a second shielding plate provided on the moving beam, wherein the opening is shielded by the first shielding plate and the second shielding plate. It is characterized by doing.

  According to the present invention, since the shielding device that shields the opening of the walking beam heating furnace is provided below the furnace chamber, the shielding device is less likely to be directly affected by radiant heat, Deterioration can be suppressed. Further, since the shielding device is configured by the first shielding plate fixed to the opening and the second shielding plate provided on the moving beam, the structure of the shielding device can be simplified. Accordingly, the durability of the shielding device for the walking beam heating furnace can be improved.

  The shielding device for the walking beam type heating furnace of the present invention is preferably provided in a furnace chamber support portion that supports the furnace chamber below.

  According to the present invention, since the shielding device is arranged in the furnace chamber support portion, the shielding device can be arranged using the space in the furnace chamber support portion, and the height of the entire walking beam heating furnace can be suppressed. .

  In the shielding apparatus for a walking beam heating furnace according to the present invention, it is preferable that the first shielding plate is inclined downward from a proximal end portion fixed to the opening portion toward a distal end portion.

  According to the present invention, since the first shielding plate is inclined downward from the proximal end portion toward the distal end portion, the falling object in the opening can slide down along the inclination of the first shielding plate, and the falling object Can be prevented from staying on the first shielding plate.

  In the shielding device for a walking beam heating furnace according to the present invention, it is preferable that the second shielding plate is inclined downward from a proximal end portion fixed to the moving beam toward a distal end portion.

  According to the present invention, the falling object in the opening can slide down along the inclination of the second shielding plate, and the falling object can be prevented from staying on the second shielding plate.

  The shielding apparatus for the walking beam type heating furnace of the present invention is provided on a moving frame that supports the moving beam, a sealing trough that contains a liquid for sealing the furnace chamber, and the first shielding plate with the liquid. It is preferable that the cooling pipe extends downward from the first shielding plate, and an opening end thereof is immersed in the liquid accommodated in the seal trough.

  According to the present invention, since the opening end on the lower side of the cooling pipe is immersed in the liquid accommodated in the seal trough, the liquid in the seal trough is removed by the lifting operation of the seal trough when the moving beam is moved. The first shielding plate can be cooled by using the motion of the moving beam.

  It is preferable that the shielding device for the walking beam heating furnace of the present invention includes a receiving box provided on the second shielding plate for receiving a fallen object.

  According to the present invention, since falling objects can be received in the receiving box, it is possible to prevent the falling objects from falling into the sealing trough and accumulating. Moreover, if an openable inspection port is provided, the fallen object received by the receiving box can be collected via the inspection port.

The side view which shows the walking beam type heating furnace which concerns on one Embodiment of this invention. The perspective view which shows the sealing device of a walking beam type heating furnace. The side view which shows the shielding apparatus of a walking beam type heating furnace. Operation | movement explanatory drawing of a shielding apparatus. Operation | movement explanatory drawing of a shielding apparatus. The side view which shows the shielding apparatus which concerns on the modification of this invention. The side view which shows the shielding apparatus which concerns on the modification of this invention. The perspective view which shows the shielding apparatus which concerns on the modification of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In addition, in this embodiment, when expressing a direction, it is based on the conveyance direction (front direction of FIG. 1, the right direction of FIG. 3) of a steel piece, the front is the said conveyance direction, the back is the opposite direction, and the up, down, left and right are the said Each direction seen from the transport direction.

[Walking beam heating furnace overall structure]
In FIG. 1, a walking beam heating furnace 1 includes a furnace chamber 2, a furnace chamber support 3 that supports the furnace chamber 2 below, a plurality of fixed beams 4, a plurality of moving beams 5, and a furnace chamber 2. , A shielding device 6 for shielding the openings 22 and 31 through which the moving beam 5 is inserted, a water sealing device 7 as a sealing device for sealing the furnace chamber 2, and a moving device for moving the moving beam 5. 8 and.

  The furnace chamber 2 is formed of a refractory material such as a refractory brick. The furnace chamber 2 includes a hearth 21 and an opening 22 that penetrates the hearth 21 and opens up and down. The opening 22 has an oval shape that is long in the front-rear direction, and is formed in a minimum size that can secure a moving space in the front-rear direction of the moving beam 5.

The furnace chamber support section 3 is provided below the furnace chamber 2 and supports the furnace chamber 2 from the hearth 21 side. This furnace chamber support part 3 is provided with an opening part 31 that opens up and down. The opening 31 is provided directly below the opening 22 and communicates with the inside of the furnace chamber 2 through the opening 22.
In the case of the present embodiment, as shown in FIG. 2, the furnace chamber support portion 3 includes a plurality of H-section steels arranged in parallel and an H-section steel spanned between them. Consists of cross beams welded to each other (hearth cross beam). Moreover, the opening part 31 is comprised with the frame formed with the H-section steel in a cross beam.

  The fixed beam 4 is provided in the furnace chamber 2, and a plurality of fixed beams 4 are arranged in the left-right direction. Each fixed beam 4 includes a plurality of support columns 41 erected on the hearth 21 at intervals in the front-rear direction, and beams 42 that extend over the upper ends of the support columns 41 and extend in the front-rear direction. Yes.

  The moving beam 5 is disposed between the adjacent fixed beams 4. Each moving beam 5 includes a plurality of support columns 51 erected on the moving frame 81 at intervals in the front-rear direction, and a beam 52 extending over the upper ends of the plurality of support columns 51 and extending in the front-rear direction. I have. Among these, the column 51 is inserted through the openings 22 and 31, and the beam 52 is disposed in the furnace chamber 2.

  The shielding device 6 is provided below the furnace chamber 2 and is accommodated in the opening 31. The shielding device 6 shields the opening 31 so as to shield the opening 22 communicating with the opening 31. Details of the shielding device 6 will be described later.

As shown in FIG. 2, the water sealing device 7 is provided in a seal trough 71 containing sealing water as a liquid for sealing the furnace chamber 2 and a lower portion of the furnace chamber support portion 3, and the lower end side is a seal trough. A seal box 72 immersed in seal water in 71 and a scraper 73 supported by the seal box 72 are provided.
The seal trough 71 is a water tank having an open top, and is provided on the upper surface of the moving frame 81. The seal trough 71 extends in the front-rear direction and accommodates the lower ends of all the seal boxes 72 provided for one moving beam 5.
The seal box 72 is a cylindrical member and is generally formed of a steel plate having corrosion resistance in order to prevent high temperature corrosion. The seal box 72 is fixed to the lower surface of the first shielding plate 61 described later, and communicates with the inside of the furnace chamber 2 through the openings 31 and 22.
The scraper 73 is attached to a bracket 74 extending in the front-rear direction from the front surface portion and the rear surface portion of the seal box 72, and is supported by the seal box 72 via the bracket 74.

  The moving device 8 is disposed in a space below the furnace chamber support 3 together with the water sealing device 7. The moving device 8 includes a moving frame 81, a motor 82 such as a hydraulic motor or an electric motor, a cam 83 that is connected to the output shaft of the motor 82 and abuts against the bottom surface of the moving frame 81, and the moving frame 81 in the front-rear direction. And a hydraulic cylinder (not shown) that is reciprocated.

[Shielding device]
In FIG. 3, the shielding device 6 includes a first shielding plate 61 fixed to the opening 31, a second shielding plate 62 provided on the moving beam 5, and a cooling pipe 63 that cools the second shielding plate with seal water. And a receiving box 64 provided on the second shielding plate 62 and an open / close inspection port 65 for inspecting the inside of the opening 31.

  The first shielding plate 61 is made of an SS material or an SUS material, or made of a steel material and a refractory material such as ceramics, and has an annular shape formed along the opening edge of the opening 31. And openings 22 and 31 are shielded. In the first shielding plate 61, an outer edge portion 61 </ b> A as a base end portion is fixed to the lower surface of the opening portion 31, and an inner edge portion 61 </ b> B as a distal end portion projects toward the center side of the opening portion 31. The first shielding plate 61 is inclined downward from the outer edge portion 61A toward the inner edge portion 61B.

  The second shielding plate 62 is provided in the opening 31 and shields the openings 22 and 31. The second shielding plate 62 is supported by the column 51 of the moving beam 5 and has a shape protruding from the column 51 in an umbrella shape. This 2nd shielding board 62 is also comprised by what was formed with steel materials, such as SS material and SUS material, and what was formed with the said refractory materials, such as said steel materials and ceramics.

The cooling pipe 63 prevents the first pipe 63A provided in the first shielding plate 61, the second pipe 63B extending downward from the first shielding plate 61, and the backflow to the seal trough 71 side. And a check mechanism 63C.
The first pipe 63 </ b> A extends along the inclination of the first shielding plate 61, penetrates the first shielding plate 61 from the lower surface of the first shielding plate 61 to the inner edge of the first shielding plate 61, and seals trough 71. Open toward.
The second pipeline 63B is connected to the first pipeline 63A at the lower surface of the first shielding plate 61 and communicates with the first pipeline 63A. The lower open end of the second pipe line 63B is immersed in seal water accommodated in the seal trough 71.
The check mechanism 63C is provided in the second pipeline 63B.

  The receiving box 64 is configured by a cylindrical box-like body having an upper opening, and the side surface and the bottom surface thereof are formed in a mesh shape. By this receiving box 64, it is possible to receive falling objects such as a scale lump falling into the opening 31, a dropped refractory, and a large solid lump such as a skid button. For this reason, falling objects can be prevented from falling into the seal trough 71 through the opening 31, and damage to the scraper 73 due to falling objects can be prevented.

  The inspection port 65 is provided in the cross beam which comprises the furnace chamber support part 3, and is comprised so that opening and closing is possible. By opening the inspection port 65, the shielding device 6 in the opening 31 can be inspected, or the fallen object accommodated in the receiving box 64 can be recovered.

[Operation of walking beam heating furnace and shielding device]
In the walking beam heating furnace 1 described above, the steel piece transfer operation by the moving beam 5 and the operation of the shielding device 6 will be described.
First, in the moving beam 5, the beam 52 is positioned below the beam 42 of the fixed beam 4 as indicated by a solid line in FIG. 1. At this time, the second shielding plate 62 shields the openings 22 and 31 at positions indicated by solid lines in FIG.

  And if a steel piece is carried in in the furnace chamber 2, the motor | power_engine 82 will be driven and the cam 83 will rotate and the moving frame 81 will raise. Thereby, as shown by a two-dot chain line in FIG. 1, the moving beam 5 rises, and the steel piece is pushed up by the beam 52. At this time, the second shielding plate 62 shields the openings 22 and 31 at a position indicated by a two-dot chain line in FIG. Further, since the seal trough 71 rises together with the moving frame 81, the seal water in the seal trough 71 flows into the second pipe 63B of the cooling pipe 63 and rises and flows through the first pipe 63A to be the first shielding. The plate 61 is cooled. Thereafter, the seal water is discharged from the first pipe line 63 </ b> A into the opening 31, flows down in the seal box 72, and returns to the seal trough 71.

  Next, a hydraulic cylinder (not shown) is driven, the moving frame 81 moves forward, and the steel piece moves forward. Thereby, as shown in FIG. 5, the moving beam 5 moves forward. At this time, the second shielding plate 62 shields the openings 22 and 31 at positions indicated by solid lines in FIG. Further, since the seal trough 71 moves forward together with the moving frame 81, the scraper 73 scrapes and moves the fallen object that has fallen into the seal trough 71 backward. Subsequently, the prime mover 82 is driven, the moving beam 5 is lowered together with the moving frame 81, and the steel piece is transferred from the moving beam 5 to the fixed beam 4. At this time, the second shielding plate 62 shields the openings 22 and 31 at a position indicated by a two-dot chain line in FIG. Then, a hydraulic cylinder (not shown) is driven, the moving beam 5 moves rearward together with the moving frame 81, and returns to the position indicated by the solid line in FIG. Thereafter, the same operation as described above is repeated, and the steel pieces are sequentially conveyed forward.

[Effect of the embodiment]
According to this embodiment, there are the following effects.
That is, since the shielding device 6 is provided under the furnace chamber 2, deformation and deterioration of the shielding device 6 due to a high temperature atmosphere can be suppressed. Moreover, since the shielding apparatus 6 is comprised by the 1st shielding board 61 fixed to the opening part 31, and the 2nd shielding board 62 provided in the moving beam 5, the structure of the shielding apparatus 6 can be simplified. it can. Therefore, the durability of the shielding device 6 can be improved.
Moreover, since the shielding apparatus 6 is provided under the furnace chamber 2, the shielding apparatus 6 can be maintained easily and the maintainability of the shielding apparatus 6 can be improved.
Furthermore, since the shielding device 6 is disposed in the furnace chamber support portion 3, the shielding device 6 can be disposed using the space in the furnace chamber support portion 3, and the height of the walking beam type heating furnace 1 is suppressed. be able to. Therefore, the construction cost of the walking beam heating furnace 1 can be reduced, and the work period of the installation work can be shortened.

  Moreover, since the 1st shielding board 61 inclines below toward the inner edge part 61B from the outer edge part 61A, the fallen object in the opening part 31 can slide down along the inclination of the 1st shielding board 61, and it falls. An object can be prevented from staying on the first shielding plate 61.

  In addition, since the opening end on the lower side of the cooling pipe 63 is immersed in the sealing water accommodated in the seal trough 71, the lifting and lowering operation of the seal trough 71 when moving the moving beam 5 causes the inside of the seal trough 71 to move. Seal water can be caused to flow into the cooling pipe 63, and the first shielding plate 61 can be cooled using the motion of the moving beam 5.

  Further, since the fallen object can be received by the receiving box 64, it is possible to prevent a large solid fallen object from falling and accumulating in the seal trough 71, and to prevent the scraper 73 from being damaged. Further, since the openable inspection port 65 is provided, the fallen matter received by the receiving box 64 can be collected through the inspection port 65.

[Modification]
The present invention is not limited to the above-described embodiment, and various improvements and design changes can be made without departing from the spirit of the present invention, and includes the following modifications.

  For example, the shielding device 6 may include a shielding member 66 that connects the first shielding plate 61 and the second shielding plate 62 as shown in FIG. The shielding member 66 is formed of a flexible material and is configured to be deformable in accordance with the movement of the moving beam 5. As the shielding member 66, a member formed in a mesh shape that allows a small fallen object to pass therethrough may be provided over the entire gap between the first shielding plate 61 and the second shielding plate 62. A plurality of shielding members 66 may be provided in the gap between the shielding plate 61 and the second shielding plate 62 at intervals in the circumferential direction, and the gaps may be intermittently closed in the circumferential direction.

  The shielding device 6 may include a cooling pipe 67 shown in FIG. The cooling pipe 67 includes a first pipe 67A configured in the same manner as the first pipe 63A, a second pipe 67B having a curved portion 67D curved upward, and a check mechanism provided in the curved portion 67D. 67C. If such a cooling pipe 67 is provided, the seal water in the seal trough 71 can be caused to flow into the cooling pipe 67 even when the seal trough 71 descends together with the moving frame 81.

The shielding device 6 may be provided in the seal box 72. For example, the first shielding plate 61 is fixed to the sealing box 72 in the sealing box 72, and the second shielding plate 62 is a moving beam in the sealing box 72. It may be supported by five struts 51.
The shielding device 6 may be provided over the opening 31 and the seal box 72. For example, the first shielding plate 61 is provided in the opening 31 and the second shielding plate 62 is a moving beam within the seal box 72. It may be supported by five struts 51.

In the embodiment, the first shielding plate 61 is fixed to the lower surface of the opening 31, but may be fixed to the opening 31 in the opening 31.
Moreover, the 1st shielding board 61 may be comprised as a part of seal box 75, as shown in FIG. The seal box 75 includes an upper first cylindrical portion 75A, and a narrow width portion 75B as a first shielding plate in which the width of the front, rear, left and right is gradually narrowed downward from the lower end of the first cylindrical portion 75A. The second cylindrical portion 75C is provided at the lower end of the narrow width portion 75B. In this case, the first shielding plate is fixed to the opening 31 via the first cylindrical portion 75A by the first cylindrical portion 75A being supported by the opening 31.

The first pipes 63A and 67A of the cooling pipes 63 and 67 do not need to be opened in the opening 31. For example, the first pipes 63A and 67A other than the connection part with the first pipes 63A and 67A on the bottom surface of the first shielding plate 61. You may open at a position. Even in this case, the seal water discharged from the cooling pipes 63 and 67 flows down in the seal box 72 and returns to the seal trough 71.
In the above embodiment, the first shielding plate 61 is cooled by using the motion of the moving beam 5. However, in order to increase the cooling capacity, the space below the furnace chamber 2 is used to pump water. Also good.

  In the above-described embodiment, the side surface and the bottom surface of the receiving box 64 are formed in a mesh shape. It may be formed.

  In the above-described embodiment, the inspection port 65 is provided in the transverse beam that constitutes the furnace chamber support unit 3. However, when the seal box 75 has the configuration shown in FIG. At this time, an opening may be provided in the cross beam so that the inspection port 65 can be opened and closed from the outside of the cross beam.

  In the said embodiment, although the water sealing apparatus 7 was used as a sealing apparatus, the furnace chamber 2 may be sealed with liquids other than sealing water.

  The moving device 8 is not limited to that of the above-described embodiment, and may be a device that moves the moving frame 81 by, for example, a hydraulic cylinder having an output shaft connected to the bottom surface of the moving frame 81 or the like.

  DESCRIPTION OF SYMBOLS 1 ... Walking beam type heating furnace, 2 ... Furnace chamber, 3 ... Furnace chamber support part, 4 ... Fixed beam, 5 ... Moving beam, 6 ... Shielding device, 7 ... Water sealing device, 8 ... Moving device, 22 ... Opening part , 31 ... opening, 61 ... first shielding plate, 62 ... second shielding plate, 63 ... cooling pipe, 64 ... receiving box, 71 ... seal trough, 81 ... moving frame.

Claims (6)

A shielding device that communicates with the walking beam furnace and shields the opening through which the moving beam is inserted.
The shielding device is provided under the furnace chamber,
A first shielding plate fixed to the opening;
A second shielding plate provided on the moving beam,
The walking beam type heating furnace shielding apparatus, wherein the opening is shielded by the first shielding plate and the second shielding plate. In the shielding apparatus of the walking beam type heating furnace according to claim 1,
A walking beam type heating furnace shielding apparatus, wherein the shielding apparatus is provided in a furnace chamber support section for supporting the furnace chamber below. In the shielding apparatus of the walking beam type heating furnace according to claim 1 or 2,
The shielding apparatus for a walking beam heating furnace, wherein the first shielding plate is inclined downward from a proximal end portion fixed to the opening portion toward a distal end portion. In the shielding apparatus of the walking beam type heating furnace of any one of Claims 1-3,
The shielding apparatus for a walking beam type heating furnace, wherein the second shielding plate is inclined downward from a proximal end portion fixed to the moving beam toward a distal end portion. In the shielding apparatus of the walking beam type heating furnace of any one of Claims 1-4,
A sealing trough provided in a moving frame supported by the moving beam and containing a liquid for sealing the furnace chamber;
A cooling pipe for cooling the first shielding plate with the liquid,
The cooling pipe is extended from the first shielding plate, and an opening end thereof is immersed in the liquid accommodated in the seal trough. In the shielding apparatus of the walking beam type heating furnace of any one of Claims 1-5,
A walking beam heating furnace shielding apparatus, comprising a receiving box provided on the second shielding plate for receiving a fallen object.

Images