JP2004293927A - Carriage type heating furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carriage type heating furnace capable of surely sealing a specific space (clearance) between a hearth member and a carriage base part with a simple mechanism. <P>SOLUTION: This carriage type heating furnace 1 comprises a sealing means 6 provided with a seal member having a contact face of which a lower face is substantially flush with an opposite end part of the base part, at an end part of the hearth member 4 faced to the base part 5 of the carriage, and sealing the specific space (clearance) a by being kept into contract with lower faces of both end parts of the hearth member and the carriage base part, a supporting means vertically movably supporting the seal member, a pressing spring 8 for pressing the seal member to raise the same, and an opening and closing means for raising the seal member by the energizing force of the pressing spring to seal the specific space, and lowering the seal member against the energizing force of the pressing spring to open the specific space. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a trolley heating furnace. More specifically, the present invention relates to a trolley-type heating furnace having sealing means for sealing a gap generated between a pedestal portion of a trolley and a hearth member.
[0002]
[Prior art]
The heating furnace, which uses a trolley to load the object to be heated into the furnace and performs heat treatment, etc., has a predetermined space between the left and right outer edges of the trolley and the left and right inner edges of the hearth so that the trolley can enter and exit smoothly. Hereinafter, this is referred to as a gap). For this reason, the hot air escapes out of the furnace from the gap, causing a decrease in the furnace temperature and a decrease in the combustion efficiency. In particular, a decrease in the furnace temperature in the vicinity of the gap due to the intrusion of the outside air causes a variation in the quality of the object to be heated. . Furthermore, there is also a problem that the lower structure of the bogie is exposed to the high temperature in the furnace, thereby causing erosion of structural members and the like.
[0003]
For this reason, many proposals have been made for a sealing method for sealing a gap formed between the inner edge of the hearth member and the outer edge of the pedestal portion of the bogie. For example, a sealing edge is formed below the left and right inner edges of the hearth and the left and right outer edges of the bogie, and a shield plate that can be turned around the rotation axis and attached to the lower end of the sealing edge is attached outside the sealing edge, There is disclosed a bogie-type heating furnace in which the shield plate is inverted by operating a cylinder to seal a gap between the hearth and the bogie (see Patent Document 1).
[0004]
FIG. 6 shows a bogie type heating furnace according to the prior art. 6 is symmetrical, only the left side of the figure will be described. The heating furnace includes a side wall 32, a top wall 31, and a hearth 33. The hearth 33 has an open center, and a bogie 34 riding on a rail 36 via wheels 35 can freely enter and leave the opening.
[0005]
33 'is a sealing edge attached so as to protrude downward from the left and right inner edges of the open part of the hearth 33, 34' is protruding downward from the left and right outer edges of the bogie 34, and the sealing edge 33 ' This is the seal edge on the side of the bogie 34 that is on the same plane as the lower end.
[0006]
Reference numeral 37 denotes a shielding plate which is in contact with the sealing edges 33 ′ and 34 ′ from below and can seal the gap a between the sealing edges 33 ′ and 34 ′. Supported. Reference numeral 43 denotes a link plate for transmitting the movement of the rod 42 of the cylinder 41 to the rotation shaft 38.
[0007]
Next, the operation of the heating furnace will be described.
[0008]
When the cart 34 on which the object to be heated is placed enters the furnace, the cylinder 41 is operated to open the shield plate 37 (leave it away). When the carriage 34 enters the furnace, the front door of the furnace is closed, or before closing, the cylinder 41 is operated to invert the shielding plate 37 to press the sealing edges 33 'and 34' from below to seal the gap a. Then, heat treatment is performed in this state.
[0009]
When the heating process is completed, the front door is opened, and the cylinder 41 is operated to open the shielding plate 37 (release), and the carriage 34 is taken out of the furnace.
[0010]
However, this sealing method is not always satisfactory because it requires a large number of cylinders, has a complicated mechanism, and has a high manufacturing cost.
[0011]
[Patent Document 1]
Japanese Utility Model Publication No. Sho 62-36056
[Problems to be solved by the invention]
An object of the present invention is to provide a bogie-type heating furnace having a sealing means that can be reliably sealed with a simpler mechanism and that can reduce equipment costs and maintenance costs.
[0013]
[Means for Solving the Problems]
The present inventors have focused on the use of a pressing spring as a pressing force of a seal body for sealing a gap in order to solve the above problem.
[0014]
That is, the carriage type heating furnace of the present invention has a heating chamber above and a carriage introduction chamber below the heating chamber, and the carriage section into which the heating chamber and the carriage introduction chamber are introduced, and the carriage. A bogie type heating furnace divided by a hearth member facing each other with a predetermined space on both sides of the part,
An end of the hearth member facing the base of the carriage has a contact surface that is substantially the same lower surface as an opposite end of the base, and further includes the hearth member and the base. A sealing body that abuts against the lower surface of each of the ends and seals the predetermined space; a support unit that vertically supports the sealing body; a pressing spring that presses and raises the sealing body; Opening and closing means for lifting the seal body by the urging force of a spring to seal the predetermined space, and for lowering the seal body against the urging force of the pressing spring to open the predetermined space; It is characterized by having sealing means having.
[0015]
[Action]
In the trolley heating furnace of the present invention, the end of the hearth member and the opposite end of the trolley stand form substantially the same lower surface, so that they come into close contact with the sealing surface of the seal body. The gap (predetermined space) can be reliably sealed.
[0016]
Further, since the lifting of the seal body and the pressing on the gap are realized by the urging force of the pressing spring, the sealing surface of the seal body can evenly contact the sealing surface of the gap.
[0017]
The pressing of the seal body by the cylinder according to the prior art may release the pressing force of the seal body due to a failure of the pressurizing device system for operating the cylinder or a failure of the cylinder itself. There is no such danger because it is pressed by an extremely simple mechanism.
[0018]
【Example】
Hereinafter, an embodiment of a truck type heating furnace according to the present invention will be described with reference to FIGS.
[0019]
FIG. 1 is a schematic side view showing the outline on the left side when the bogie type heating furnace as an embodiment of the present invention is viewed from the opening side. The sealing device is disposed immediately below the left and right hearths. FIG. 2 is a schematic side view of a main part of the left sealing device, and the arrow B side is an opening (door side) of the heating furnace. It should be noted that the right side is configured symmetrically with respect to FIGS. 1 and 2 and the operation can be described in the same manner, so that the description is omitted.
[0020]
The trolley type heating furnace of the present invention includes a heating furnace main body 1 including a side wall 2, a top wall 3, and a hearth member 4, a trolley 5 capable of freely entering and leaving the open portions of the left and right hearth members 4, and a hearth member 4. And a sealing means 6 for sealing a gap a extending in the insertion direction of the bogie 5 formed by the edge 4a of the bogie 5 and the base edge 5a of the bogie 5. The heating chamber 1 and the carriage 5 form a heating chamber and a carriage introduction chamber.
[0021]
The sealing means 6 seals the gap a, a supporting means for vertically supporting the sealing body 7, a pressing spring 8 for pressing and rising the sealing body 7, and a pressing force of the pressing spring 8. Opening / closing means for raising the seal body 7 to seal the gap a and lowering the seal body 7 against the urging force of the pressing spring 8 to open the gap a.
[0022]
FIG. 3 is an enlarged view of the sealing means of the bogie type heating furnace. The sealing body 7 is formed by using a long channel steel as a skeleton material, and a sealing material 7a made of heat-resistant and elastic ceramic fiber or glass wool is provided in a space surrounded by the web portion and the flange portion. Is filled. The sealing surface 7b contacts the sealing edge 4a of the hearth member 4 forming the gap a and the base sealing edge 5a of the bogie 5.
[0023]
The sealing edge 4a is an L-shaped steel 1 (L1) that is welded to the edge of the hearth member 4 and extends in the loading direction of the bogie, and a lower surface of the L-shaped steel 1 is opposed to the L-shaped steel 1 and is located on the hearth. L-shaped steel 2 (L2) welded along the step A of the member 4. Further, the sealing edge 5a is formed by welding an L-shaped steel 3 (L3), which is welded to an edge of the pedestal portion of the trolley 5 opposite to the edge of the hearth member 4, and extends in the bogie loading direction. L-shaped steel 4 (L4) is welded against the shape steel 3 and along the step B of the bogie. Here, the horizontal plane of the L-shaped steel 2 on the hearth member side and the horizontal plane of the L-shaped steel 4 on the bogie base portion side are substantially on the same plane, and abut the sealing surface 7b of the sealing body 7 to seal the gap a. Can be stopped.
[0024]
The seal body 7 is supported at appropriate locations by shafts 9, and each shaft 9 is vertically inserted into a fitting member 12 that is vertically fixed to a mounting frame 10. Further, the lower end of each shaft 9 is fixed to the connecting member 11, so that the sealing member 7 can be simultaneously moved up and down in the longitudinal direction by moving the connecting member 11 up and down. The mounting frame 10 is fixed to the furnace wall 2 or the base 17 or the like. Note that the shaft 9, the mounting frame 10, the connecting member 11, and the like constitute support means for the seal body.
[0025]
A pressing spring 8 that presses and raises the seal member 7 is inserted between the seal member 7 and a fitting member 12 with the shaft 9 fixed to the mounting frame 9. Can be pushed up in the direction of arrow A.
[0026]
A bearing portion 13 is attached to an appropriate position in the bogie loading direction on a mounting frame 10 for attaching the seal body 7 to the heating furnace main body 1, and a rod 14 is rotatably supported by the bearing portion 13. A cam 16 having a roller 15 at its tip is fixed to an appropriate position in the axial direction of the rod 14 so as to contact the connecting member 11. Since the rod 14 is located above the connecting member 11 in parallel with the connecting member 11, the cam 16 also rotates with the rotation of the rod 14 so that the connecting member 11 can be moved up and down. At this time, since the roller 15 moves while rotating on the surface of the connecting member 11, the rotating operation of the rod 14 can be performed smoothly without damaging the connecting member 11.
[0027]
The rod 14 is supported by a bearing 18 fixed to the base 17 of the heating furnace main body 1, and its tip projects through the furnace wall to the outside of the furnace, and can be operated from the outside of the furnace by a handle 19. I have. A stopper 20 is provided near the handle 19 to prevent the rod 14 from reversing. As described above, the opening / closing means is constituted by the rod 14, the cam 16, the handle 19, and the like.
[0028]
In the trolley-type heating furnace of the present invention configured as described above, first, when the trolley 5 is inserted into the heating furnace main body 1 and heating is performed, the long diameter of the cam 16 is adjusted by rotating the handle 19 of the rod 14. The seal body 7 is lowered so as to be perpendicular to the connecting member 11 as shown in FIG.
[0029]
Next, when the carriage 5 is loaded into the furnace, the front door of the furnace is closed, and the handle 19 of the rod 14 is rotated to rotate the cam 16 so that the long diameter of the cam 16 is parallel to the connecting member 11 as shown in FIG. . By the rotation of the cam 16, the pressing spring 8 compressed via the shaft 9 and the connecting member 11 expands by the urging force and simultaneously presses and raises the seal body 7. As a result, the seal surface 4b of the hearth member 4 and the seal surface 7b of the seal body 7 abut on the seal edge 5a of the five trucks, and the gap a is sealed. Here, since the sealing surface 7b of the sealing body 7 is formed of the sealing material 7a having elasticity, the sealing edges 4a and 5a bite into the sealing material 7a, and the sealing of the gap a becomes more complete. Thereafter, the heating process of the material to be heated proceeds with the gap a sealed.
[0030]
When the heating process of the material to be heated is completed and the carriage 5 is carried out from the heating furnace main body 1, the handle 19 of the rod 14 is rotated so that the long diameter of the cam 16 becomes perpendicular to the connecting member 11 as shown in FIG. To The rotation of the cam 16 lowers the shaft 9 fixed to the connecting member 11 against the urging force of the pressing spring 8, so that the integrally formed seal body 7 also lowers to contact the gap a. The connection is released. Then, the pressing spring 8 is compressed.
[0031]
It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.
[0032]
For example, the sealing surface 7b of the sealing body 7 is not limited to a flat surface, but may be a cross-section having a vertex at a portion facing the gap a of the sealing surface 7b or a convex shape such as an isosceles triangle. preferable.
[0033]
By making the sealing surface 7b of the sealing body convex as described above, more reliable sealing can be realized. In addition, it can be expected that foreign matter such as scale in the furnace that has fallen on the seal surface easily slides off the seal surface when the gap a is opened and is removed. Furthermore, even when foreign matter such as scales falls on the seal body 7 at the open position, the foreign matter easily slides down and is prevented from accumulating on the seal surface because the sealing surface is inclined. In this way, inconveniences such as incomplete sealing due to the presence of foreign matter between the sealing surface and the sealing edge of the gap or damage to the sealing surface can be prevented.
[0034]
Further, in the present invention, the handle 19 is manually rotated to rotate the rod 14. However, the cylinder may be attached to the handle 19 and rotated by air pressure or hydraulic pressure, or the electric motor may be rotated. Use is also possible.
[0035]
【The invention's effect】
According to the present invention, the urging force of the pressing spring is used as the driving force for sealing and opening the gap formed between the heating furnace main body of the bogie type heating furnace and the bogie with the seal body. Can be manufactured. Further, since the mechanism is simple, the occurrence of troubles such as failures is small. Therefore, the present invention greatly contributes to reduction of the manufacturing cost and the maintenance cost of the bogie type heating furnace.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a main part of a left half of a carriage type heating furnace of the present invention.
FIG. 2 is a schematic side view showing a sealing means of the carriage type heating furnace of the present invention.
FIG. 3 is a partial cross-sectional side view for explaining a gap opening state of the sealing means of the present invention.
FIG. 4 is a partial cross-sectional side view for explaining a gap sealing state of the sealing means of the present invention.
FIG. 5 is a schematic front view of the opening / closing means of the present invention.
FIG. 6 is a schematic side view of a main part of a bogie type heating furnace having a sealing device according to the prior art.
[Explanation of symbols]
1: Bogie type heating furnace 2: Side wall 3: Top wall 4: Furnace hearth 5: Bogie 6: Sealing means 7: Seal body 8: Press spring 9: Shaft 10: Mounting frame 11: Connecting member 13: Bearing 14: Rod 16: Cam 19: Handle 30: Dolly type heating furnace of the prior art a: Gap (predetermined space)

Claims (1)

It has a heating chamber above and a trolley introduction chamber below the heating chamber, and opposes with a predetermined space on both sides of the trolley where the heating chamber and the trolley introduction chamber are introduced and on both sides of the pedestal. A truck type heating furnace partitioned by a hearth member,
An end of the hearth member facing the base of the carriage has a contact surface that is substantially the same lower surface as an opposite end of the base, and further includes the hearth member and the base. A sealing body that abuts against the lower surface of each of the ends and seals the predetermined space;
Support means for vertically supporting the seal body,
A pressing spring that presses and raises the seal body,
Opening and closing means for lifting the seal body by the urging force of the pressing spring to seal the predetermined space, and for lowering the seal body against the urging force of the pressing spring to open the predetermined space; ,
A bogie type heating furnace comprising a sealing means having:

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