JP2017122527A - Heat seal structure of carriage type heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat seal structure excellent in durability and capable of preventing the thermal damage for a long period of furnace body hardware, a conductive cable, rails, travel devices below the carriage while regarding heat seal structure of a carriage type heating furnace in a heat seal structure between the depth wall of the heating furnace and the carriage.SOLUTION: A heat seal structure of a carriage type heating furnace in that by drawing near a carriage 10 reciprocating on rails to a depth wall 5 provided across a travel route of a rail 2 for heating the furnace wall interior which covers its upper part so as to heat a heated object on the carriage. The depth wall 5 includes: a cutting part 7 for accommodating the progress front end part of the carriage; and a hardware hanging down body 21 swingable in the depth direction by providing a rotational axis above the cutting part 7, in which the lower end part of the hardware hanging down body 21 abuts an upward contact surface 15 of the carriage 10 so that the hardware hanging down body 21 blocks between the depth wall 5 and the progress front end part of the carriage 10 for heat sealing.SELECTED DRAWING: Figure 1

Description

  The present invention is a heat-sealing structure of a cart-type heating furnace that heats the inside of a furnace wall that covers the upper part of a cart that reciprocates on a rail and heats the inside of the furnace wall that covers the top, In particular, the present invention relates to a heat seal structure at a front end portion of the carriage.

  A cart-type heating furnace is known as a heating furnace used for heating large steel materials and the like in the atmosphere. The carriage on which the steel material or the like is placed moves forward on a rail (track) following the heating furnace, enters the heating furnace, becomes a floor of the heating chamber, and heat treatment of the steel material or the like thereon is performed. Further, after the heat treatment, the carriage again moves backward on the rail to the opposite side, and the next machining process or the like is performed by conveying the steel material or the like from the heating furnace to the outside.

  By the way, the side wall of the furnace body of the heating furnace forming the heating chamber is provided with a gap between the traveling path of the carriage so as not to interfere with the movement of the carriage. Such a gap leads to intrusion of low-temperature air from the outside of the furnace and leakage of high-temperature combustion gas to the outside of the furnace during heat treatment, and causes a decrease in temperature uniformity of the heating chamber. . Further, the heat flow leaking from the heating chamber causes heat damage to the furnace hardware, conductive cables, rails, traveling devices under the carriage, and the like outside the heating furnace. Therefore, a heat seal structure has been proposed that closes these gaps after a carriage enters the heating chamber.

  For example, Patent Document 1 discloses a heat seal structure in which a movable seal body is provided on a side wall portion. An arm is swingably attached to a shaft provided at the lower end of the side wall, and an air cylinder is attached between the arm and the side wall. Further, a seal body extending in the longitudinal direction is attached to the tip of the arm. When the air cylinder is driven after the carriage enters the heating chamber, the seal body is pressed against the gap between the side wall and the carriage from below to close the gap and provide a heat seal.

  Moreover, since a gap is also formed between the rear wall of the heating furnace and the carriage, a heat seal structure is required similarly. The back wall is installed so as to close the back side of the furnace across the front of the traveling path of the carriage, but the carriage that has entered the heating chamber approaches the back wall and does not break the back wall in front of it. Stop. At this time, there is a gap between the front end of the carriage and the back wall, but the carriage is carrying heavy objects and it is difficult to control the stop operation due to inertial force, and the state on the rail is always constant due to scale etc. Due to the fact that it is not always maintained, the stop position of the carriage is displaced, and the size of this gap also changes. Therefore, unlike the side wall, the heat seal structure is given a structure that does not depend on the size of the gap.

  For example, Patent Document 2 discloses a heat seal structure in which a seal body is elastically inserted into a gap between a rear wall and a front end of the carriage. A seal support arm is attached to one end of a swing lever that is pivotally supported by the lower end of the back wall and extends upward in the furnace, and the other end of the swing lever is biased to the back by a spring. Further, one end of a flexible sheet made of ceramic fiber is attached to the tip of the seal support arm as a seal body, and the opposite end is fixed to the back wall. As a result, one end of the seal body is elastically pressed against the front end of the carriage to ensure a heat seal even if the size of the gap between the rear wall and the front end of the carriage changes. It is said that a heat seal can be reliably obtained even by shrinkage.

  Furthermore, in patent document 3, the heat seal structure which deform | transforms so that a movement of a trolley may follow between back walls is disclosed. The carriage advancing end is provided with a rear seal plate extending obliquely downward toward the bottom of the back wall, and at the lower end of the back wall, a bag made of a refractory fiber sewing product at a position corresponding to the rear seal plate. A rear sand bag filled with is suspended. As a result, the carriage can be moved to the stop position, and the end of the rear seal plate can be pressed against the rear sand bag for heat sealing. Since the rear sandbag has appropriate elasticity or resilience, it is in close contact with the rear seal plate and returns to its original shape when it is separated from the rear seal plate.

JP 2000-8120 A JP-A-2-143092 Japanese Patent Laid-Open No. 2005-9759

  By the way, in a heat seal structure in which a flexible refractory material such as ceramic fiber is given to the gap between the rear wall of the heating furnace and the carriage, and the change in the size of the gap due to the movement of the carriage is absorbed, such a refractory material is used. However, it was necessary to change frequently before gas leakage or the like occurred. For this purpose, the work can be performed only after the furnace is stopped and cooled down, which is very labor and costly.

  The present invention has been made in view of the situation as described above. The object of the present invention is to provide a heat seal structure between the rear wall of the heating furnace and the carriage, which is excellent in durability and has a furnace body hardware. Another object of the present invention is to provide a heat seal structure capable of preventing thermal damage in a traveling device or the like underneath a conductive cable, rail, or bogie over a long period of time.

  The heat sealing structure for a trolley-type heating furnace according to the present invention heats the interior of the furnace wall that covers the upper part of the trolley that reciprocates on the rail by approaching the inner wall provided across the traveling path of the rail, A heat sealing structure of a trolley type heating furnace for heating an object to be heated on a trolley, wherein the back wall has a cutting portion that accommodates a front end portion of the trolley, and the depth of the upper portion of the cutting portion is a rotation axis. A metal hanging body swingable in a direction is provided, a lower end portion of the hardware hanging body abuts on an abutting surface facing the upper side of the carriage, and the hardware hanging body is formed on the back wall and the carriage. A heat seal is provided so as to close the space between the front end portion and the front end portion.

  According to this invention, the cutting part which accommodates the front-end part of a trolley | bogie can be given inside a back wall, the position of a heat seal can be moved to the front side of a trolley | bogie, and the thermal influence on the trolley | bogie by the leakage of combustion gas can be made small. At the same time, it is possible to reduce the thermal effect on the heat seal body and to improve its durability. Also, by making the seal body a swinging body of a metal hanging body, it is possible to reduce the leakage of gas by reducing the sandwiching of scale and refractory fragments, and to reduce the load of excessive force on the heat seal body. Durability can be increased.

  In the above-described invention, the contact surface may be an inclined surface that is inclined downward toward the forward end portion. According to this invention, it is possible to further reduce the influence of the scale and the refractory fragments on the contact surface, reduce the leakage of high temperature gas, reduce the thermal effect on the carriage, and reduce the excessive force on the heat seal body. The load can be reduced and its durability can be improved.

  In the above-described invention, a plurality of the hardware hanging bodies may be provided along the back wall. According to this invention, even if the contact surface changes its height in the width direction of the carriage due to a scale or the like, each of the plurality of hardware suspensions absorbs this change in height and leaks high-temperature gas. As a result, the thermal effect on the carriage can be reduced, and the load of excessive force on the heat seal body can be reduced, and its durability can be improved.

It is a side view of the heat seal structure of the back wall of the cart type heating furnace by this invention. It is a side view of the principal part of a heat seal structure. It is a front view of the principal part of a heat seal structure.

  First, the heat seal structure of the back wall of the cart-type heating furnace which is one embodiment according to the present invention will be described in detail with reference to FIGS. In FIG. 1, the right side is the back side and the left side is the front side, that is, the entrance side of the heating furnace. Also, the right side of the paper is the front of the carriage.

  As shown in FIG. 1, the cart 10 of the cart-type heating furnace can reciprocate by a wheel 11 on the rail 2 on the floor surface 1 as a traveling path, and can enter the heating furnace or move backward. The cart 10 includes a frame 12 made of H-shaped steel or the like that supports a wheel 11, and a cart refractory 13 on which an object to be heated such as a steel material to be heat-treated is placed. That is, when the carriage 10 is entered into the heating furnace and stopped at the stop position, the carriage refractory 13 serves as a hearth and defines the lower surface of the heating chamber 30 on the upper side. In other words, this heating furnace can heat the object to be heated on the cart refractory 13 by heating the heating chamber 30 that is inside the furnace wall that covers the top of the cart 10.

  The carriage 10 is a substantially rod-like carriage extending from the lower part of the frame 12 toward the back side from the lower end of the frame 12 toward the carriage stopper 3 provided on the floor 1 in order to restrict the forward movement from the stop position. The position restricting body 19 is provided at the approximate center in the width direction (direction perpendicular to the paper surface). Moreover, the front end part of the frame 12 is provided with a cart-side seal body 14 made of a refractory material. The cart-side seal body 14 projects forward from the end of the cart refractory 13 and extends over the entire width of the cart 10. The cart-side seal body 14 is provided with an abutment surface 15 that abuts a hanging body 21 (described later) facing upward. In the present embodiment, the contact surface 15 is an inclined surface that is inclined downward toward the front of the carriage 10.

  On the back side of the heating furnace, a back wall 5 that is a furnace wall crossing the front of the traveling path of the carriage 10 traveling on the rail 2 is provided. The back wall 5 is made of a structural hardware and a refractory (not shown), and has a cutting portion 7 recessed in the back side in the vicinity of the lower end thereof. The cutting part 7 is provided with a support metal 6 attached to the structural hardware of the back wall 5 and protruding to the near side. The support metal 6 supports a shaft body 22 extending in the width direction of the heating furnace (a direction perpendicular to the paper surface) together with its bearing and is positioned above the cutting portion 7. A hanging body 21 is suspended from the shaft body 22 below the support metal 6 and is swingable in the depth direction of the heating furnace. The suspended body 21 is provided along the back wall 5 over a position corresponding to the full width of the carriage 10.

  The suspended body 21 is a substantially plate-like body extending in the width direction of the heating furnace, and has a contact portion 21a formed of a curved surface that protrudes downward at the lower end thereof. Moreover, the drooping body 21 and the shaft body 22 are hardware manufactured using metal materials, such as stainless steel and structural rolled steel. The surface of the hanging body 21 is preferably coated with a refractory. The refractory coating is obtained by thermal spraying of alumina powder or the like, for example. In addition, it is preferable to coat the surface of metal members other than the hanging body 21 accommodated in the cutting part 7 similarly with a refractory.

  As described above, the carriage 10 that has entered the heating furnace moves to the stop position so as to approach the back wall 5 on the rail 2 and comes into contact with the carriage stopper 3 and the carriage position regulating body 19 or a carriage (not shown). 10 stops at the stop position under the control of the driving device. At this time, the front end portion of the bogie refractory 13 of the bogie 10 is disposed closer to the wall surface 8 above the cutting portion 7 of the back wall 5, but the bogie refractory 13 and the wall surface 8 with respect to the stop position of the bogie 10. A gap is formed between the two. Such a gap is provided so as not to collide with the back wall 5 in consideration of a shift in the stop position of the carriage 10 for which it is difficult to strictly control the stop position because it is a heavy object.

  As shown in FIG. 2 (a), when the carriage 10 is stopped at the stop position, the carriage-side seal body 14 protruding forward from the end of the carriage refractory 13 is accommodated in the lower part of the cutting section 7, The contact surface 15 is brought into contact with the contact portion 21 a of the hanging body 21. Since the suspended body 21 can swing in the depth direction of the heating furnace, for example, as shown in FIG. 2B, the suspended body 21 follows the contact surface 15 according to the movement or stop of the carriage 10. That is, the hanging body 21 is swung so as to move the contact portion 21a to the back side while responding to changes in the height and depth direction of the contact surface 15. At this time, the hanging body 21 presses the contact surface 15 toward the front side and the lower side by a force based on its own weight with the shaft body 22 as the rotation axis. Thereby, between the trolley | bogie side sealing body 14 and the hanging body 21 between the trolley | bogie 10 and the back wall 5 can be obstruct | occluded, and it can heat-seal.

  In particular, the drooping body 21 is a metal object using a metal material, and can withstand repeated use without being worn out. For example, when a flexible refractory fiber or the like is used as a sealing body, fraying occurs and frequent repairs are required. In order to repair the sealing body attached to the back wall in the trolley type heating furnace, it is necessary to sufficiently reduce the temperature in the furnace, and time and energy loss are large, which hinders continuous operation of the heating furnace. On the other hand, in the present embodiment, the frequency of repair can be reduced by the hanging body 21 that does not cause fraying and the like, and does not hinder the continuous operation of the heating furnace. Moreover, the metal object accommodated in the cutting part 7 containing the drooping body 21 can suppress deterioration by a heat | fever by coating with a refractory material, and this can also reduce the frequency of repair. In this way, the durability of the heat seal structure can be improved, and thermal damage to the furnace body hardware, conductive cables, rails, traveling devices under the carriage, etc. can be prevented over a long period of time.

  Furthermore, since the hanging body 21 is made of a swinging gold object, it is difficult for scales and refractory fragments to be caught, and it is possible to reduce the possibility of pinching them with the contact surface 15. That is, the heat seal can be stably maintained.

  Further, since the cart-side seal body 14 is accommodated in the lower portion of the cutting portion 7, these gaps are located in front of the cart 10 relative to the upper wall surface 8 of the back wall 5 and are separated from the cart 10. . That is, for example, even when a high-temperature combustion gas in the heating chamber 30 leaks from the heat seal due to a scale sandwiched between the contact surfaces 15, the combustion gas is guided to a position spaced forward from the carriage 10. Therefore, the thermal effect on the carriage 10 can be reduced. Further, the combustion gas is guided further forward with respect to the rail 2 with respect to the position where the carriage 10 can travel. As a result, even if there is a leakage of combustion gas, the stable traveling of the carriage 10 is not affected.

  The abutment surface 15 may be, for example, a horizontal plane. However, if the abutment surface 15 is an inclined surface as in the present embodiment, a margin of an appropriate dimension for reliably abutting against the hanging body 21 is provided in the depth direction and Can be given in each of the vertical directions. Thereby, it can respond easily to the shift | offset | difference of the stop position of the trolley | bogie 10. FIG. In addition, the inclined surface makes it difficult for scale and refractory debris to stay on the contact surface 15, so that the contact surface 15 and the contact portion 21 a can be satisfactorily contacted with no gap. Furthermore, even when a scale or the like that has become hot due to heating falls when the carriage 10 is at the stop position, the carriage 10 is guided to a position spaced forward from the carriage 10 in the same manner as the high-temperature gas described above, and the heat to the carriage 10 is increased. The impact can be reduced.

  Moreover, since the cart 10 is stopped so that the wall surface 8 above the cutting portion 7 of the back wall 5 and the rear end portion of the cart refractory 13 are brought close to each other, the cutting portion 7 can be regarded as a shadow from the heating chamber 30. It arranges in the position which becomes. Thereby, radiation of the direct heat from the heating chamber 30 into the cutting part 7 can be prevented, and deterioration of hardware such as the suspended body 21 provided in the cutting part 7 can be suppressed.

  Furthermore, the shaft body 22 is located at the upper part of the cutting part 7. As a result, even if a scale or the like falls along the wall surface 8 of the back wall 5, the shaft body 22 is not swung down on the shaft body 22 or its surrounding bearings, and the shaft body 22 for swinging the hanging body 21 is rotated. Does not interfere. Thereby, the obstruction | occlusion between the trolley | bogie side seal body 14 and the hanging body 21 can be maintained favorable.

  By the way, as shown in FIG. 3, the hanging body 21 extends over the position corresponding to the entire width of the carriage 10 as described above, but it is preferable that a plurality of the hanging bodies 21 are provided in the width direction along the back wall 5. . Thereby, for example, even when a scale or refractory fragments stay on the contact surface 15 and the contact position on the contact surface 15 changes in the width direction, the change is absorbed by each of the plurality of hanging bodies 21. It is possible to easily maintain the blockage between the carriage 10 and the back wall 5.

  As described above, according to the heat seal structure of the present embodiment, the position of the heat seal can be moved to the front side of the carriage, and the influence of heat on the carriage due to the leakage of combustion gas can be reduced. Does not affect. In addition, the drooping body 21 can be obtained from a metal material, so that fraying due to repeated use can be reduced and gas leakage can be reduced. This reduces the frequency of repairs and does not hinder continuous operation of the heating furnace. In this way, the heat seal structure is excellent in durability, and it is possible to prevent thermal damage in the furnace body hardware, conductive cables, rails, traveling devices under the carriage, etc. over a long period of time.

  The exemplary embodiments according to the present invention have been described so far, but the present invention is not necessarily limited thereto. Those skilled in the art will recognize a variety of alternative embodiments without departing from the scope of the appended claims.

2 Rail 5 Back wall 7 Cutting part 10 Bogie 14 Bogie side seal body 15 Contact surface 21 Hanging body 21a Contact part 22

Claims (3)

A trolley-type heating furnace that heats the inside of the furnace wall that covers the upper part of the trolley that reciprocates on the back wall provided across the rail travel path and heats the object to be heated on the trolley The heat seal structure of
The inner wall has a cutting part that accommodates the front end of the carriage, and is provided with a metal hanging body that can swing in the depth direction with the upper part of the cutting part as a rotation axis. The lower end of the hardware hanging body The carriage is provided with a heat seal so that the portion abuts against an abutting surface facing the upper side of the carriage, and the metal hanging body closes between the inner wall and the front end of the carriage. Heat seal structure of the type heating furnace.   The heat sealing structure for a trolley-type heating furnace according to claim 1, wherein the abutting surface is an inclined surface inclined downward toward the forward end portion.   The heat-seal structure for a trolley-type heating furnace according to claim 1, wherein a plurality of the metal hanging bodies are provided along the inner wall.

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