JP5553127B2 - Elevating heat treatment furnace - Google Patents

Description

  The present invention relates to an elevating heat treatment furnace suitable for degreasing or firing a ceramic molded body.

  Conventionally, for example, as a firing furnace for heat-treating a ceramic molded body to be heat-treated, a heating chamber is formed inside a cylindrical furnace body, a heat source is disposed in the heating chamber, and the furnace gas is circulated by a blower. -Heating elevating heat treatment furnaces have been proposed. In this elevating heat treatment furnace, an elevating table that can be raised and lowered is arranged at the bottom of the furnace body, and a bowl containing a ceramic molded body is placed on the elevating table, and degreasing and the like are performed while rotating the elevating table. Heat treatment is performed.

  In such an elevating heat treatment furnace, the binder decomposition gas generated during degreasing becomes a problem when the ceramic molded body is heat-treated. Since this binder decomposition gas is heavier than air, it goes further to the bottom from the furnace body. In order to insert the lifting table into the heating chamber, a narrow gap is provided between the side surface of the lifting table and the wall surface of the opening formed in the bottom of the furnace body. Since the temperature in the gap is lower than the temperature in the furnace, there is a problem that the binder decomposition gas is liquefied or solidified as it goes from the furnace body to the bottom and accumulates in a tar form.

  To solve the above problems, an annular gas introduction pipe is arranged in the gap between the side surface of the lifting table and the wall surface of the opening formed in the bottom of the furnace body, and atmospheric gas is blown from the gap into the heating chamber. An elevating heat treatment furnace that suppresses the binder decomposition gas from being liquefied in a tar shape and accumulated in a gap between the elevating table and the furnace body has been proposed (see Patent Document 1).

Japanese Patent Laid-Open No. 10-141861

  However, even in the elevating heat treatment furnace proposed in Patent Document 1, a large number of organic gases are generated, particularly in the degreasing process for the ceramic molded body, and the phenomenon that the surface of the elevating table is liquefied in a tar shape occurs. Therefore, it was difficult to obtain a sufficient sealing effect. That is, in the blowing of gas into the heating chamber by the gas introduction pipe arranged in an annular shape, it was possible to prevent the accumulation of tar-like accumulation at the blowing location, but the tar-like shape at the location where no gas was blown out. The accumulation of deposits could not be suppressed. Also, the binder decomposition gas that goes through the gap between the side surface of the lifting table and the wall surface of the opening formed at the bottom of the furnace body cannot be suppressed even by blowing out the gas into the heating chamber. There was a problem of accumulation in a tar-like liquefied state at the bottom.

  Therefore, a main object of the present invention is to provide an elevating heat treatment furnace that prevents the binder decomposition gas from accumulating in a tar shape at the surface of the elevating table and at the bottom of the furnace body.

An elevating heat treatment furnace according to the present invention includes a furnace body, an opening formed at the bottom of the furnace body, a heat source disposed inside the furnace body, and a furnace body close to or away from the opening of the furnace body. An elevating heat treatment furnace having an elevating table for taking in and out an object to be heat treated, a curtain-like seal portion disposed in a gap between the bottom of the furnace main body and the elevating table, and an atmosphere inside the furnace main body In order to blow out the same kind of gas toward the side surface of the lifting table, a gas outlet provided below the seal portion , a plate-like mounting plate provided below the lifting table, and a furnace body A seal plate that extends from the bottom side of the outside and is provided so as to be in contact with the mounting plate, and a bottom surface outside the furnace body between the seal plate and the side surface of the lift table and close to the side surface of the lift table Protected from the side And having a wall, a lifting type heat treatment furnace.

According to the elevating heat treatment furnace according to the present invention, a seal portion is provided in the gap between the wall surface of the opening and the side surface of the elevating table, and by blowing out atmospheric gas from a gas outlet provided below the seal portion, It is possible to prevent the binder decomposition gas from accumulating in a tar-like liquefied state on the bottom side from the furnace body. Therefore, when the elevating heat treatment furnace according to the present invention is repeatedly used, the number of times of removing tar-like dirt stuck due to the binder decomposition gas can be greatly reduced, and the maintenance time can be shortened. An elevating heat treatment furnace can be obtained.
Moreover, in the elevating heat treatment furnace according to the present invention, since the protective wall is disposed further inside the seal plate, an elevating heat treatment furnace capable of preventing the accumulation of tar-like accumulation on the side surface of the seal plate is obtained. Can do.

  The above-described object, other objects, features, and advantages of the present invention will become more apparent from the following description of embodiments for carrying out the invention with reference to the drawings.

It is a schematic sectional drawing about one Embodiment of the raising / lowering type heat processing furnace concerning this invention. It is an enlarged view of the A section of the elevating heat treatment furnace shown in FIG. It is a schematic sectional drawing of other embodiment of the seal part in the raising / lowering type heat processing furnace of FIG. 1, (a) is a seal part provided between the wall surface of an opening part, and the 1st side surface of a mounting part. (B) is a case where the seal portion is provided between the bottom surface and the blocking surface of the furnace body, and (c) is a first portion of the bottom surface of the furnace body and the mounting portion. The case where it is provided between the side surfaces is shown. It is a schematic sectional drawing which is a reference example of the raising / lowering type heat treatment furnace shown in FIG. It is an enlarged view of the B section of the elevating heat treatment furnace shown in FIG.

DESCRIPTION OF SYMBOLS 1, 2 Elevating-type heat treatment furnace 10 Furnace main body 10a Bottom surface 12 Lifting table 14 Rotating device 14a Rotating shaft 14b Motor 16 Seal plate 16a Inner side surface 18 Protective wall 18a Side surface 20 Mounting plate 20a Heat resistant sealing material 22 Furnace body support part 24 Furnace chamber 26 opening 26a wall 28 seal part 28a one end 28b one side 28c other end 28d other side 30 hearth part 32 heating chamber 34 gas supply pipe 36 heater 38 blower 38a motor 38b blade part 40 exhaust duct 40a lid part 42 circulation Passage 44 Partition member 44a Inlet vent hole 44b Outlet vent hole 46 Placement part 46a First side face 46b Placement plane 48 Support part 48a Second side face 48b Shielding face 48c Bottom face 50 Support plate 50a Disc part 50b Leg part 52 Gas Introduction pipe 52a Gas introduction part 52b Piping 52c Gas Outlet 60 Seal member 60a Inner end 60c Lower surface g1 First gap g2 Second gap F Circulation direction

  An embodiment of the elevating heat treatment furnace according to the present invention will be described. FIG. 1 is a schematic cross-sectional view of an embodiment of an elevating heat treatment furnace according to the present invention, and FIG. 2 is an enlarged view of part A of the elevating heat treatment furnace shown in FIG.

  This elevating heat treatment furnace is, for example, a device for removing a binder component / organic agent contained in a ceramic molded body in a low temperature range in a process of firing a ceramic molded body that is a heat-treated object, that is, a degreasing process of the ceramic molded body. It is an elevating heat treatment furnace used for. Hereinafter, an embodiment of an elevating heat treatment furnace according to the present invention will be described in detail.

  The elevating heat treatment furnace 1 shown in FIG. 1 includes a furnace main body 10, a lifting table 12 for placing the rod W, a rotating device 14 for rotating the lifting table 12 in the furnace main body 10, and an atmosphere. A seal plate 16 and a mounting plate 20 for preventing gas and the like from leaking out of the elevating heat treatment furnace 1, and a protective wall 18 for preventing adhesion of tar-like accumulation to the seal plate 16; And a furnace body support portion 22 for supporting the furnace body 10.

  The furnace main body 10 is provided in the elevating heat treatment furnace 1 for accommodating and heat-treating an object to be heat-treated such as a ceramic molded body and maintaining heat in the furnace. The furnace body 10 is formed in a cylindrical shape. The furnace body 10 is formed of a heat insulating material such as ceramic brick or fiber. A cylindrical opening 26 is formed at the bottom of the furnace body 10. The lift table 12 is arranged in the opening 26 so that the ceramic molded body can be taken in and out of the furnace body 10 in the vicinity of or away from the opening 26. A curtain-like seal portion 28 is formed along the wall surface 26 a of the opening 26.

The seal portion 28 is provided to prevent the binder decomposition gas from flowing from the furnace body 10 toward the bottom. The seal portion 28 is formed in a cylindrical shape. A part of the one surface 28b of the one end portion 28a of the seal portion 28 is fixed with, for example, a screw along the lower end side of the wall surface 26a of the opening portion 26. In this case, the one end portion 28a of the seal portion 28 is disposed on the upper side, and the one surface 28b indicates the outer surface. When the lifting / lowering table 12 is inserted into the opening 26, the other end 28c of the sealing portion 28 is in a radial manner toward the sealing plate 16 side, which is the outer peripheral side, while being in contact with a shielding surface 48b of the lifting / lowering table 12 described later. Bend. As a result, a part of the other surface 28 d of the other end 28 c of the seal portion 28 comes into surface contact with the shielding surface 48 b of the lifting table 12. In this case, the other end 28c of the seal portion 28 is disposed on the lower side, and the other surface 28d indicates the inner surface. As such, the seal portion 28 is arranged in a curtain shape in the first gap g <b> 1 formed by the lifting table 12 and the opening 26. Further, the elevating table 12 is also rotated, the surface contact with the other surface 28d of the other end portion 28c of the seal portion 28 and the blocking surface 48b of the lifting tape b le portion 12 is maintained. The seal portion 28 is formed of an elastic body, and is formed of, for example, silicon, urethane, rubber material, or the like.

  Further, the upper surface of the bottom of the furnace body 10 is covered with the hearth plate 30. The hearth plate 30 is provided in order to suppress the binder decomposition gas from being liquefied into tar and directly accumulated in the furnace body 10. The hearth plate 30 is formed of, for example, a heat resistant metal such as stainless steel.

  A furnace chamber 24 is provided inside the furnace body 10. The furnace chamber 24 includes a heating chamber 32 for heat-treating a ceramic molded body that is a heat-treated object placed on the ridge W, and a gas supply pipe for supplying atmospheric gas into the furnace chamber 24. 34, a heater 36 as a heat source, a blower 38 for circulating atmospheric gas in the furnace chamber 24, an exhaust duct 40 for exhausting exhaust gas, and for circulating atmospheric gas or the like in the furnace chamber 24. A circulation passage 42 is provided.

  In the heating chamber 32, a large number of objects to be heat-treated such as ceramic molded bodies are provided in order to accommodate the ridges W stacked in a state of being spaced apart from each other. The heating chamber 32 is formed by a cylindrical partition member 44 in the furnace chamber 24. The partition member 44 is disposed in the center of the furnace chamber 24. The partition wall member 44 is formed with a large number of vent holes on one side and the opposite side so that the atmospheric gas supplied from the gas supply pipe 34 flows in the heating chamber 32 in the horizontal direction. Is done. An inlet vent hole 44a is formed on one side, and an outlet vent hole 44b is formed on the opposite side. A gas supply pipe 34 is provided on the upper surface side of the partition wall member 44.

  The gas supply pipe 34 is provided to supply atmospheric gas into the furnace chamber 24. The supplied atmospheric gas is circulated through the circulation passage 42 by the blower 38. The gas supply pipe 34 is disposed on the upper surface side of the partition wall member 44 so as to protrude to near the center of the furnace chamber 24. A heater 36 as a heat source is disposed at a position spaced apart from the supply port of the gas supply pipe 34 in the blowing direction.

  The heater 36 is provided to heat the atmospheric gas supplied from the gas supply pipe 34. The heater 36 is disposed on the upper surface side of the partition wall member 44 in the furnace chamber 24 and in the center. The heater 36 is provided in the middle of the circulation passage 42. The heater 36 is configured by, for example, a U-shaped or bar-shaped heat source.

  The blower 38 is provided to circulate hot air in the circulation passage 42 in the furnace chamber 24. The blower 38 includes a motor 38a as a prime mover and a blade portion 38b. The motor 38a is disposed outside the furnace body 10, and the blade portion 38b is disposed on the furnace chamber 24 side. The blower 38 is provided directly above the inlet vent hole 44 a of the partition wall member 44 and provided on the upper side surface of the furnace body 10. The blower 38 acts to draw in the atmospheric gas supplied from the gas supply pipe 34 by rotating the blade portion 38b by the motor 38a. The drawn atmospheric gas is heated by passing through the heater 36. The blower 38 acts to send the heated atmospheric gas to the circulation passage 42 and to guide it to the inlet vent 44 a of the heating chamber 32. The atmospheric gas that has passed through the heating chamber 32 passes through the outlet vent hole 44 b and is guided upward through the circulation passage 42. That is, the atmospheric gas is circulated by the blower 38 in the direction of the circulation direction F. The atmospheric gas circulated by the blower 38 is exhausted from the exhaust duct 40 formed in the furnace body 10.

  The exhaust duct 40 is provided for exhausting atmospheric gas (exhaust gas) in the furnace chamber 24. The exhaust duct 40 is provided above the outlet vent hole 44 b and is provided on the upper surface side of the furnace body 10. The exhaust duct 40 is connected to an exhaust gas treatment device (not shown). A lid 40 a that can be opened and closed is provided inside the furnace chamber 24 of the exhaust duct 40. Adjustment of whether the exhaust gas is discharged from the exhaust duct 40 or returned to the furnace chamber 24 and circulated is performed by controlling the opening and closing of the lid 40a.

  The circulation passage 42 is provided for circulating and circulating the atmospheric gas in the furnace chamber 24. In this embodiment, the circulation passage 42 is directed upward from the outlet vent hole 44b, further to the blower 38 through the partition member 44 of the heating chamber 32, and to the inlet vent hole 44a of the heating chamber 32. Formed as follows.

  The raising / lowering table 12 is provided in order to mount the eaves W for accommodating in the furnace main body 10. The lifting table 12 is formed in a convex shape when viewed from the side. The lifting table 12 includes a mounting portion 46 formed in a columnar shape and a support portion 48 formed in a columnar shape having a diameter larger than that of the mounting portion 46. A placement unit 46 is disposed on the support unit 48. The central axis of the support part 48 and the central axis of the mounting part 46 are coaxial. Each central axis extends in a direction perpendicular to the upper surface of the hearth part 30. Further, a first side surface 46 a is formed on the side surface of the mounting portion 46 in the lifting table 12, and a second side surface 48 a is formed on the side surface of the support portion 48. The first side surface 46a is provided so as to be close to the wall surface 26a of the opening 26 when the lifting table 12 is inserted into the opening 26, and the second side surface 48a is disposed on the protective wall 18 described later. It is provided so as to be close to the gas outlet 52c of the gas introduction pipe 52 to be provided. The first side surface 46a is provided to face the wall surface 26a of the opening 26 when the lifting table 12 is inserted into the opening 26, and the second side surface 48a is a protective wall 18 described later. And so as to face each other. Further, a first gap g1 is formed between the first side surface 46a and the wall surface 26a of the opening 26. A second gap g <b> 2 is formed between the second side surface 48 a and the protective wall 18. The first gap g1 is provided to enable the lifting table 12 to be smoothly inserted into the heating chamber. Since the first gap g1 is removed from the circulation passage 42, the influence of heat caused by the hot air circulating in the furnace chamber 24 is small and is lower than the temperature in the furnace chamber 24. A placement plane 46 b is formed on the side of the heating chamber 32 in the placement portion 46 of the lifting table 12. On the placement plane 46b, a support plate 50 for placing a ridge W for accommodating a heat-treated object such as a ceramic molded body is disposed. The support plate 50 includes a disc portion 50a and leg portions 50b. The disc part 50a is formed horizontally and is provided for placing the ridge W thereon. And the leg part 50b is provided in order to raise the ridge W from the mounting plane 46b of the raising / lowering table 12 by the height. In addition, a shielding surface 48b is formed on the surface other than the portion where the placement portion 46 is disposed in parallel to the placement plane 46b. When the elevating table 12 is raised, the shielding surface 48b has a function of shielding heat by being close to the bottom surface 10a side of the furnace body 10. A bottom surface 48 c is formed on the support device 48 on the rotating device 14 side. The center of the bottom surface 48 c is connected to the rotating shaft 14 a of the rotating device 14.

  The rotating device 14 is provided for rotationally driving the lifting table 12 in the furnace body 10. The rotating device 14 includes a rotating shaft 14a and a motor 14b as a prime mover for rotating the rotating shaft 14a. One end of the rotating shaft 14 a is connected to the center of the bottom surface 48 c of the support portion 48 of the lifting table 12. And the other end of the rotating shaft 14a is connected with the motor 14b. Therefore, the lifting table 12 is rotationally driven by the rotation of the motor 14b of the rotating device 14. In this way, when the lifting table 12 is rotationally driven, the ceramic molded body placed on the ridge W is heated evenly, and further, the ceramic molded body is equivalent to the atmospheric gas supplied by the gas supply pipe 34. Touch. In order to move the eaves W into and out of the heating chamber 32, an elevating device (not shown) for moving the elevating table 12 and the rotating device 14 up and down is provided.

The seal plate 16 is provided in order to prevent atmospheric gas or the like from leaking out of the elevating heat treatment furnace 1. Seal plate 16 is at least the lifting tape b le 12 and the rotary shaft 14a from the bottom surface 10a of the furnace body 10 downward is extended to the extent that can accommodate. The seal plate 16 is formed in a cylindrical shape coaxially with the rotation center of the lifting table 12. A protective wall 18 is formed further inside the seal plate 16. Further, the mounting plate 20 is provided so as to come into contact with the lower end portion of the seal plate 16 when the elevating table 12 is raised.

  The protective wall 18 is provided to prevent the tar-like accumulation of binder decomposition gas from adhering to the inner surface 16 a of the seal plate 16. The protective wall 18 extends from the bottom surface 10 a of the furnace body 10 downward to a range where it is possible to prevent tar-like accumulation from adhering to the seal plate 16. The protective wall 18 is formed in a cylindrical shape coaxially with the rotation center of the lifting table 12. Further, the protective wall 18 is formed inside the seal plate 16. Therefore, a space is formed between the seal plate 16 and the protective wall 18. In the space between the inner side surface 16a of the seal plate 16 and the side surface 18a of the protective wall 18, a gas introduction pipe 52 is disposed. Gas outlets 52c of a gas introduction pipe 52, which will be described later, are provided on the side surface 18a of the protective wall 18 in, for example, a horizontal row. Accordingly, the gas outlets 52 c are provided radially so as to surround the side surface 18 a of the protective wall 18. When the lifting table 12 is inserted into the opening 26, the side surface 18a of the protective wall 18 and the second side surface 48a of the lifting table 12 face each other, and a second gap g2 is formed.

  In the gas introduction pipe 52, the binder decomposition gas that tends to leak from the first gap g <b> 1 formed between the first side surface 46 a of the mounting portion 46 and the wall surface 26 a of the opening portion 26 is lower than the furnace body 10. It is provided to prevent heading to. The gas introduction pipe 52 includes a gas introduction part 52a and a pipe 52b. The gas introduction part 52a is provided with a gas outlet 52c for supplying the same kind of atmospheric gas as the atmospheric gas supplied from the gas supply pipe 34 to the second gap g2. One end of the pipe 52b is connected to the gas introduction part 52a, and the other end of the pipe 52b is connected to a gas supply source (not shown). The gas introduction part 52 a is formed between the protective wall 18 and the seal plate 16 so as to surround the second side surface 48 a of the lifting table 12 (in a ring shape). The gas outlet 52c is a direction orthogonal to the ascending / descending direction of the elevating table 12 and intersects the second side surface 48a of the elevating table 12 perpendicularly (that is, the axis center direction of the elevating table 12). It is formed to face. Further, the gas introduction pipe 52 is formed below the seal portion 28.

  In a narrow space such as the second gap g2, the pressure on the second side surface 48a is increased by blowing the same type of gas as the atmospheric gas from the gas blowing port 52c provided in the protective wall 18. Therefore, the binder decomposition gas that tends to leak from the first gap g1 formed between the first side surface 46a of the mounting portion 46 and the wall surface 26a of the opening portion 26 does not easily pass through the second gap g2. Become. Therefore, the binder decomposition gas is prevented from going to the bottom from the furnace body 10 and is pushed back into the furnace chamber 24. Further, since the gas outlets 52c are formed radially so as to surround the second side surface 48a around the axis of the lifting table 12, the binder decomposition gas is not affected by the rotational drive of the lifting table 12, It is possible to prevent easy passage through the second gap g2. Then, the binder decomposition gas pushed back by the gas outlet 52 c is exhausted by the exhaust duct 40. Note that, as described above, the atmospheric gas introduced through the gas introduction pipe 52 is the same type as the atmospheric gas supplied through the gas supply pipe 34, so there is no possibility of disturbing the atmosphere in the furnace chamber 24.

  The mounting plate 20 is formed in a disc shape coaxially with the rotation center of the lifting table 12. The rotating shaft 14a passes through the center of the mounting plate 20. A heat-resistant sealing material 20 a is provided on the upper surface of the mounting plate 20 so as to be coaxial with the rotating shaft 14 a and to face the lower end portion of the sealing plate 16. Further, when the elevating table 12 is raised, the lower end portion of the seal plate 16 and the heat resistant sealing material 20a are pressed against each other. The heat resistant sealing material 20a is formed of, for example, a heat resistant rubber material. Thereby, atmospheric gas etc. are prevented from leaking from the elevating heat treatment furnace 1 to the outside.

  The furnace body support portion 22 is provided to support the furnace body 10. The furnace body support 22 is formed on the lower end side of the outer peripheral wall of the furnace body 10. The furnace body support portion 22 is formed in a cylindrical shape coaxially with the rotation center of the lifting table 12. An elevating table 12 and a rotating device 14 are arranged inside the furnace body support portion 22.

  Next, the operation of the elevating heat treatment furnace 1 having the above configuration will be described. First, the lifting table 12 is lowered by the lifting device, and a plurality of ridges W are stacked and placed on the lifting table 12. Thereafter, the elevating table 12 is raised toward the opening 26 by the elevating device, and the basket W is accommodated in the heating chamber 32. At this time, the other end portion 28c of the seal portion 28 is in contact with the shielding surface 48b of the elevating table 12, and when the elevating table 12 is further raised, the other end portion 28c of the seal portion 28 is directed toward the seal plate 16. It is bent radially so as to slide on the shielding surface 48b. Then, a part of the other surface 28d of the other end 28c of the seal portion 28 comes into surface contact with the shielding surface 48b of the elevating table 12. Further, when the lifting table 12 is disposed in the opening 26, the placement plane 46b of the lifting table 12 and the hearth part 30 form the same plane.

  Next, the elevating table 12 is rotated in one direction by the motor 14b of the rotating device 14, and a circulating gas flow in the circulation direction F is generated in the furnace chamber 24 by driving the heater 36 and the blade portion 38b. The atmospheric gas supplied through the gas supply pipe 34 is supplied into the furnace chamber 24. Since the supplied atmospheric gas is drawn by the blower 38, it passes through the heater 36. Thereby, atmospheric gas is heated. The heated atmospheric gas is sent to the circulation passage 42 and blown into the heating chamber 32 through the inlet vent hole 44a. At this time, since the elevating table 12 is rotating, the ceramic molded body placed on the ridge W is evenly heated and touches the atmospheric gas evenly. Thus, the ceramic molded body accommodated in the basket W in the heating chamber 32 is degreased.

  In this degreasing step, the binder decomposition gas generated from the ceramic molded body, which is a heat-treated object, is exhausted from the exhaust duct 40 and is heavier than the atmospheric gas, so that a part of the binder decomposition gas is connected to the first side surface 46a of the lifting table 12. It tries to flow into a first gap g1 formed between the opening 26 of the furnace body 10 and the wall surface 26a. At this time, the opening portion 26 is provided with a seal portion 28, and part of the other surface 28d of the other end portion 28c of the seal portion 28 and the shielding surface 48b of the lifting table 12 are in surface contact. It is possible to prevent the binder decomposition gas from easily flowing through the first gap g1 to the lower side of the furnace body 10. Further, the gas blowout port 52c of the gas introduction pipe 52 provided in the protective wall 18 surrounds the second side surface 48a of the support portion 48 of the lifting table 12 and is in a narrow space such as the second gap g2. Since the atmospheric gas of the same type as the atmospheric gas supplied from the gas supply pipe 34 is struck, liquefaction of the binder decomposition gas can be prevented and it can be prevented from flowing downward from the furnace body 10. In addition, the accumulation of tar-like accumulation on the side surface 18a of the protective wall 18 can be prevented. Further, although the lifting table 12 is rotationally driven by the rotating device 14, a part of the other surface 28 d of the other end 28 c of the seal portion 28 and the lifting table 12 are not affected by the rotational driving of the lifting table 12. Since the surface contact with the shielding surface 48b is maintained, and the ambient gas can be applied from the gas introduction pipe 52 so as to surround the second side surface 48a of the support portion 48 of the lifting table 12, the binder decomposition gas is , It is possible to prevent the furnace body 10 from flowing into the lower side.

  And after completion | finish of a degreasing process, the raising / lowering table 12 is lowered | hung, the eaves W is taken out from the raising / lowering table 12, and it carries to the following main baking furnace, and main baking is implemented.

  The elevating heat treatment furnace 1 according to the present invention has a seal portion 28 in a first gap g1 formed between the wall surface 26a of the opening 26 formed in the furnace body 10 and the first side surface 46a of the elevating table 12. Further, the gas is introduced from the gas introduction pipe 52 into a narrow space such as the second gap g2 between the second side surface 48a of the lifting table 12 and the side surface 18a of the protective wall 18. . By combining the seal portion 28 and the gas introduction pipe 52 in the elevating heat treatment furnace 1 as described above, even when the elevating table 12 is rotationally driven, the binder decomposition gas containing the tar component is supplied to the furnace body 10. Further, it is difficult to easily flow toward the bottom through the first gap g1, and further, the atmosphere gas is driven toward the side surface so as to surround the second side surface 48a by the gas introduction pipe 52. Liquefaction of the binder decomposition gas that has flowed through the first gap g1 can be prevented, and it can be made difficult to flow further downward from the furnace body 10 through a narrow space such as the second gap g2. In addition, the accumulation of tar-like accumulation on the side surface 18a of the protective wall 18 can be prevented. Therefore, it is possible to prevent the occurrence of tar-like accumulation on the lower side of the furnace body 10.

  Further, according to the elevating heat treatment furnace 1 according to the present invention, since the cylindrical protective wall 18 is provided inside the seal plate 16, the first gap formed by the elevating table 12 and the opening 26. It is possible to prevent the tar-like accumulation due to the binder decomposition gas that has passed through g <b> 1 from adhering to the inner surface 16 a of the seal plate 16.

  In the elevating heat treatment 1 according to the present embodiment, the seal portion 28 is provided between the wall surface 26a of the opening 26 and the first side surface 46a of the placement portion 46 as shown in FIG. It may be provided between the bottom surface 10a and the blocking surface 48b of the furnace body 10 as shown in FIG. 3B, or the furnace body 10 as shown in FIG. You may provide between the bottom face 10a and the 1st side surface 46a of the mounting part 46. FIG.

  The seal part 28 shown to Fig.3 (a) is formed in a cylindrical shape, for example. A part of one surface 28b of the one end portion 28a of the seal portion 28 is fixed with, for example, a screw along the lower end side of the wall surface 26a of the opening portion 26. When the lifting table 12 is inserted into the opening 26, the other end portion 28c of the seal portion 28 is bent upward (on the other surface 28d side) while being in contact with the first side surface 46a of the lifting table 12. As a result, a part of one surface 28b of the other end portion 28c of the seal portion 28 comes into surface contact with the first side surface 46a of the elevating table 12.

  The seal portion 28 shown in FIG. 3B is formed in a cylindrical shape, for example. A part of the one surface 28b of the one end portion 28a of the seal portion 28 is fixed to the bottom surface 10a of the furnace body 10 with, for example, screws. When the elevating table 12 is inserted into the opening 26, the other end 28c of the seal portion 28 faces the seal plate 16 side (the other surface 28d side) which is the outer peripheral side while being in contact with the shielding surface 48b of the elevating table 12. Bend radially. As a result, a part of one surface 28b of the other end portion 28c of the seal portion 28 comes into surface contact with the shielding surface 48b of the lifting table 12.

  The seal portion 28 shown in FIG. 3C is formed in an annular shape, for example. A part of the one surface 28b of the one end portion 28a of the seal portion 28 is fixed to the bottom surface 10a of the furnace body 10 with, for example, screws. On the inner diameter side of the seal portion 28, there is the other end portion 28c, and an opening hole smaller than the diameter of the placement portion 46 of the lifting table 12 is formed inside the other end portion 28c. Since the opening hole is formed to be smaller than the diameter of the mounting portion 46, when the mounting portion 46 of the lifting table 12 is inserted into the opening hole, the opening hole and the other surface 28d of the other end portion 28c of the seal portion 28 are mounted. The other end 28c is bent upward (on the other surface 28d side) while being in surface contact with the first side surface 46a of the mounting portion 46.

Next, a reference example of the elevating heat treatment furnace will be described. 4 is a schematic cross-sectional view of an elevating heat treatment furnace which is a reference example of the elevating heat treatment furnace shown in FIG. 1, and FIG. 5 is an enlarged view of part B of the elevating heat treatment furnace shown in FIG. . In this reference example, the same parts as those in the elevating heat treatment furnace 1 shown in FIGS. 1 and 2 are denoted by the same reference numerals and description thereof is omitted.

In the elevating heat treatment furnace 2 according to this reference example , unlike the elevating heat treatment furnace 1, a seal member 60 is provided for the protective wall 18 instead of the gas introduction pipe 52. The seal member 60 is formed in an annular shape, for example. The seal member 60 is provided so as to project from the protective wall 18 in the radial direction. The inner diameter of the seal member 60 is larger than the diameter of the mounting portion 46 of the lifting table 12 and smaller than the diameter of the support portion 48 of the lifting table 12. An inner end 60a is provided on the inner diameter side of the seal member 60, and an opening hole is formed inside the inner end 60a. Since the opening hole is formed to be smaller than the diameter of the support portion 48, when the support portion 48 of the elevating table 12 is inserted into the opening hole, the lower surface 60 c of the inner end portion 60 a of the seal member 60 and the support portion 48. The inner end portion 60a is bent upward while being in surface contact with the second side surface 48a. The seal member 60 is formed of an elastic body, and is formed of, for example, silicon, urethane, rubber material, or the like.

In the elevating heat treatment furnace 2 according to the present reference example , the same effects as the elevating heat treatment furnace 1 are exhibited, and the following effects are also exhibited. That is, by providing the sealing member 60 in place of the gas introduction pipe 52, it is not necessary to separately arrange the gas introduction pipe 52, so that it is not necessary to prepare facilities necessary for installing the gas introduction pipe 52. .

In the temperature Fushiki heat treatment furnace 1, the bottom surface 10a side of the furnace body 10, while the inside of the sealing plate 16 has a protective wall 18 provided is not limited thereto, particularly providing protective wall 18 It does not have to be. In this case, the gas outlet 52c of the gas introduction pipe 52 is provided on the inner side surface 16a of the seal plate 16, and the seal plate 16 and the second side surface 48a of the lifting table 12 are formed as close as possible. Is desirable.

Further, in the temperature Fushiki heat treatment furnace 1, a curtain-like seal portion 28 may a part of the seal portion 28 is also fixed to the furnace body 10 side may be fixed to the elevating table 12. Therefore, the curtain-like seal portion 28 is fixed so that at least one end portion of the one end portion 28a or the other end portion 28c of the seal portion 28 is a free end.

In the temperature Fushiki heat treatment furnace 1, the gas blow-out port 52c of the gas introduction pipe 52, are provided at equal intervals in a horizontal row on the side surface 18a of the protective wall 18 is not limited thereto, the lateral two rows It may be provided in a zigzag diagonally. Therefore, the arrangement of the gas outlets 52c of the gas introduction pipe 52 only needs to be a structure in which atmospheric gas can be driven into the second side surface 48a in a narrow space such as the second gap g2.

Furthermore, the temperature Fushiki heat treatment furnace 1, a heater 36 as a heat source is a top side of the partition member 44 in the furnace chamber 24, and has been arranged in the center is not limited thereto If provided in the middle of the circulation passage 42, it may be provided on the lower side of the furnace chamber 24.

Further, the temperature Fushiki heat treatment furnace 1 and 2, is constituted by a heat treatment furnace of cylindrical it is not limited thereto and may be a square tube shape (box-type). Further, the elevating table 12 is not limited to a rotary turntable and may be a table that only elevates. Therefore, the shape of the lifting table 12 may be rectangular, and is not limited to a disk shape. Further, the lifting table 12 may be a cylindrical table.

  The elevating heat treatment furnace according to the present invention is used, for example, as a furnace for degreasing or firing a ceramic molded body.

Claims (1)

A furnace body;
An opening formed in the bottom of the furnace body;
A heat source disposed inside the furnace body;
An elevating table for taking in and out the object to be heat-treated into or out of the furnace body close to or away from the opening of the furnace body,
An elevating heat treatment furnace having
A curtain-like seal portion disposed in a gap between the bottom of the furnace body and the lifting table;
In order to blow out the same kind of gas as the atmosphere gas inside the furnace body toward the side surface of the lifting table, a gas blowout port installed below the seal part;
Equipped with a,
A plate-like mounting plate provided below the lifting table;
A seal plate that extends from the bottom side of the outside of the furnace body and is provided so as to be in contact with the mounting plate;
A between the side surface of the lifting table and the sealing plate, characterized Rukoto to have a, and extended by a protective barrier from the outside of the bottom side of the furnace body so as to approach the side surface of the elevating table An elevating heat treatment furnace.

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