JP2011149560A - Heating device for heating casting before and after coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating device for heating casting before and after coating, capable of properly heating the casting before coating at high speed with high heat efficiency, further properly performing heating treatment after the coating, and further suppressing equipment cost and an installation area. <P>SOLUTION: This heating device includes a fluid bed heating furnace 10 which applies a powder and granular material 2 as a heat medium and in which the workpiece 1 before coating is immersed in a fluid bed section 11a, a hot air generator applying an electrothermal heater as its heating heat source and generating hot air for heating and fluidizing the heat medium, a curing furnace 30 to which an exhaust gas discharged from the fluid bed heating furnace 10 is introduced, and the workpiece 1 after the coating is also introduced to accelerate curing of the coating of the workpiece 1, and an air blower recovering the exhaust gas discharged from the curing furnace 30, distributing the exhaust gas to the hot air generator for heating it, and distributing the hot air to the fluid bed heating furnace 10 again. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a casting pre- and post-coating heating apparatus that heats a casting before painting and accelerates hardening of the casting after painting.

  Castings coated for rust prevention or the like are used in pipes through which liquids such as water are sent and valve boxes of valves provided in the pipes. This casting is heat-treated before coating in order to improve the processing speed in the coating process and to ensure the coating quality. Moreover, after coating a casting, post-heating is also performed in order to accelerate the hardening of the coating.

  Such heat treatment before and after painting will be described in detail below. First, there are a coating method using a liquid paint and a coating method using a powder paint as a coating method for casting parts, and the coating method using the liquid paint includes immersion and brush coating. Spray coating, electrostatic coating, etc., and coating methods using the powder coating include sprinkling coating, spray coating, fluidized bed immersion coating, electrostatic coating, etc. Done. When performing any of these coating methods, it is required to improve the quality of the coating film by reliably applying paint and forming a film, and heating in the film forming process and the curing process. It is desired to increase the processing speed to improve the production efficiency, and as a process corresponding to these demands, pre-coating heating (pre-heating process) for heating the casting material in advance is performed.

  The heating temperature for this pre-coating heating is set taking into account the temperature drop in the casting material, the composition of the painting line for painting the casting material, and the painting line so that it can be processed at the optimum temperature corresponding to the type of paint and the painting method. Is done.

  As a conventional heating apparatus that performs pre-coating heating or the like, mainly a combustion gas atmosphere furnace (for example, Patent Document 1) that generates a combustion gas using gas or oil as a fuel and heats a workpiece such as a casting with the combustion gas. Etc.) are used. In addition, a warm water heating tank etc. are also used when heating temperature may be 100 degrees C or less.

  However, in the pre-coating heat treatment that is performed before coating with the resin-based paint, the heating temperature may be less than 300 ° C., but when heating for powder coating, about 150 is required to melt the paint. Since it is necessary to be able to be heated to a temperature equal to or higher than ° C., a method of heating by convective heat transfer using a combustion gas having a small heat capacity as a heat medium is mainly used.

  Also, when the casting material is powder-coated in a high-speed processing line, a curing ring disposed over a long distance is used to perform post-heating treatment to accelerate the curing of the coating after painting. A furnace was needed.

JP 2009-57621 A

  However, when using a heating device that uses combustion gas as the heat medium, the stored heat of the recovered exhaust gas is recovered with a heat exchanger, or fresh cold air is always replenished to supply the oxygen necessary for fuel combustion. Therefore, there is a drawback that the equipment cost for the heat exchanger is increased and the thermal efficiency is lowered. In addition, if the heat treatment speed is increased by using a heating device that heats the combustion gas having a small heat capacity as a heat medium by convection heat as described above, a long heating path is required and a large heating furnace is required. In addition to the extremely high equipment costs, there are also disadvantages that a large installation area is required.

In addition, when the curing furnace is linearly arranged over a long distance in order to promote hardening after the casting is painted, a large installation area and a long installation space are required.
The present invention eliminates the above-mentioned drawbacks and problems, can cast the casting before coating satisfactorily at high speed and high thermal efficiency, and can also perform the heat treatment after coating satisfactorily. An object of the present invention is to provide an apparatus for heating before and after coating a casting that can reduce the cost and the installation area.

  In order to eliminate the above-mentioned drawbacks and problems, the present invention is a heating apparatus for casting before and after coating, which heats a workpiece made of a casting before coating, and also after coating, using the powder as a heat medium, before coating A fluidized bed heating furnace in which the workpiece is immersed in the fluidized bed portion, a heating heat source is an electric heater, a hot air generator for generating hot air to heat and flow the heating medium, and the fluidized bed heating furnace Exhaust exhaust gas is introduced, and a workpiece after painting is introduced, a curing furnace that accelerates hardening of the paint on the workpiece, and the exhaust gas exhausted from the curing furnace is recovered to generate the hot air And a blower for sending the hot air to the fluidized bed heating furnace again.

  According to this configuration, since the workpiece made of a casting is heated by immersing it in the fluidized bed portion using the granular material as a heat medium, the workpiece that is the casting before coating can be heated at high speed and with good thermal efficiency. . In other words, since the work is immersed and heated in the fluidized bed part using the granular material as a heat medium, the work is evenly and evenly heated from the entire surface compared to a gas atmosphere furnace, etc. without causing local overheating, etc. Heating can be performed stably, and the installation space can be kept relatively small. In addition, since the heating heat source is an electric heater, even when hot air heated by the electric heater is introduced into the fluidized bed heating furnace and the curing furnace and heated, as in the case where the combustion gas is introduced, There is no need to recover the retained heat of the recovered exhaust gas with a heat exchanger or to introduce oxygen or cold air to use it for combustion air, and only the fluidized bed heating furnace recovers the discharged hot air In addition, extremely high thermal efficiency can be maintained by recirculating it to a curing furnace. In addition, since one hot air generator can be used for both pre-coating heating and post-coating heating, the equipment cost can be reduced and the installation space can be reduced as compared with the case where a heating heat source is provided individually. Can be suppressed.

  Further, the casting pre- and post-coating heating apparatus of the present invention has a curing furnace disposed substantially above the fluidized bed heating furnace, and the fluidized bed heating furnace is connected to the fluidized bed heating furnace through a communication passage that connects the fluidized bed heating furnace and the curing furnace. The exhaust gas is configured to be introduced into a curing furnace.

  In this way, by arranging the curing furnace at a position above the fluidized bed heating furnace, it is only necessary to provide a communication path that connects the fluidized bed heating furnace and the curing furnace. Exhaust gas is easily introduced into the curing furnace naturally, and it is not necessary to provide a separate blower for actively sending the exhaust gas discharged from the fluidized bed heating furnace to the curing furnace. As well as operation and maintenance costs.

  Further, the casting pre- and post-coating heating apparatus of the present invention includes a fluidized bed heating furnace having a carry-in passage through which a workpiece is carried into the fluidized bed heating furnace main body and a carry-out passage through which the work from the fluidized bed heating furnace main body is carried out. The fluidized bed heating furnace provided at the end of the carry-out passage section is disposed lower than the connection portion between the carry-in passage and the fluidized bed heating furnace main body. The furnace outlet is arranged lower than the connection part between the carry-out passage and the fluidized bed heating furnace main body.

  With this configuration, the high-temperature exhaust gas discharged from the fluidized bed portion of the fluidized bed heating furnace main body becomes difficult to be discharged through the carry-in passage and the carry-out passage, thereby minimizing a decrease in thermal efficiency. .

  The casting pre- and post-coating heating apparatus of the present invention is characterized in that the work inlet and outlet of the curing furnace are arranged lower than the main body of the curing furnace. According to this configuration, it is difficult for high-temperature exhaust gas introduced into the curing furnace to be discharged from the inlet and outlet of the curing furnace, and it is also possible to minimize a decrease in thermal efficiency.

  The casting pre- and post-coating heating apparatus of the present invention has a curing furnace having a shape in which the workpiece after painting can be U-turned in the curing furnace, and a shape in which the workpiece conveyance path in the curing furnace is U-turned. It is characterized by that.

  With this configuration, it is possible to perform post-painting heating (curing) over a long distance in a curing furnace of approximately the same length as the fluidized bed heating furnace, while minimizing the installation area and installation space of the heating device before and after coating. Can be suppressed.

  The casting coating equipment of the present invention also includes a heating device for before and after casting coating, a coating device, and a work heated in a fluidized bed heating furnace to the coating device and curing the workpiece coated with the coating device. And a conveying means for conveying to the furnace. With this configuration, the casting can be applied continuously and efficiently.

  According to the present invention, a workpiece made of a casting is heated by immersing it in a fluidized bed portion using a granular material as a heat medium, so that the workpiece is evenly distributed from the entire surface at a higher speed than in a gas atmosphere furnace or the like. In addition, it can be stably heated without causing local overheating and the installation space can be kept relatively small. Moreover, extremely high thermal efficiency can be maintained by using an electric heater as the heating heat source and collecting the discharged hot air and circulating it not only in the fluidized bed heating furnace but also in the curing furnace. Moreover, a single hot-air generator can be used for both pre-painting and post-coating heating, reducing equipment costs and keeping the installation space small compared to the case where individual heating heat sources are provided. be able to.

  Further, by providing a curing furnace at a substantially upper position of the fluidized bed heating furnace and providing a communication passage that connects the fluidized bed heating furnace and the curing furnace, the exhaust gas of the fluidized bed heating furnace is communicated through the communication passage. Can be naturally introduced into the curing furnace, and it is not necessary to provide a separate blower that actively transports the exhaust gas discharged from the fluidized bed heating furnace to the curing furnace. At the same time, operation and maintenance costs can be reduced.

  In addition, the fluidized bed heating furnace is provided with a carry-in passage and a carry-out passage, and the fluidized bed heating furnace inlet and the fluidized bed heating furnace outlet are arranged lower than the connection portion between the fluidized bed heating furnace main body and the carry-in passage and the carry-out passage. The high-temperature exhaust gas discharged from the fluidized bed part of the fluidized bed heating furnace main body becomes difficult to be exhausted through the fluidized bed heating furnace inlet and the fluidized bed heating furnace outlet, thereby minimizing a decrease in thermal efficiency. Can be suppressed.

  In addition, the curing furnace is shaped so that the workpiece after painting can be U-turned in the curing furnace, and the shape of the workpiece conveying path in the curing furnace is U-turned. Now, while being able to perform heating (curing) after painting over a long distance, the installation area and installation space of the pre- and post-coating heating device can be minimized.

  In addition, as a coating facility of the present invention, the casting pre- and post-coating heating device, the coating device, and the workpiece heated in the fluidized bed heating furnace are transported to the coating device and the workpiece coated with the coating device is cured in the curing furnace. By providing the conveying means for conveying the casting, the casting can be coated continuously and efficiently, and a high production efficiency can be maintained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front cross-sectional view of a casting pre- and post-coating heating apparatus (painting equipment) according to an embodiment of the present invention. It is side surface sectional drawing of the heating apparatus before and behind the same coating. It is a simple top view of the heating apparatus before and behind the painting (coating equipment). It is side surface sectional drawing of the curing furnace of the heating apparatus before and behind the same coating.

DESCRIPTION OF EMBODIMENTS Hereinafter, a casting pre- and post-coating heating apparatus and coating equipment according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the casting pre- and post-coating heating apparatus 100 according to the embodiment of the present invention heats a workpiece 1 made of a casting before coating and also heats the casting before and after coating, which is also heated after coating. Device 100. This pre- and post-coating heating apparatus 100 uses a fluidized bed heating furnace 10 in which a granular material 2 made of ceramic particles is used as a heat medium, and a work 1 before coating is immersed in the fluidized bed portion 11a, and a heating heat source is an electric heater. And a hot air generator (electric heating device) 21 for generating hot air to heat and flow the granular material 2 as the heat medium, and exhaust gas discharged from the fluidized bed heating furnace 10 are introduced and painted. A later work 1 is introduced, a curing furnace 30 that promotes hardening of the coating of the work 1, and exhaust gas discharged from the curing furnace 30 is collected and sent to the hot air generator 21 to be heated. The blower 22 that sends hot air to the fluidized bed heating furnace 10 again and the workpiece 1 are moved while being immersed in the fluidized bed portion 11a of the fluidized bed heating furnace 10 while being transported along the heating transport path R1 (see FIG. 3). A heating conveyor 40 as a fluidized bed conveying means, and a curing conveying means for moving the work 1 in the curing furnace 30 while conveying the workpiece 1 along a curing conveying path R2 (see FIG. 3). A ring conveyor 50 is provided.

  The fluidized bed heating furnace 10 includes a fluidized bed heating furnace main body 11 in which a fluidized bed portion 11a in which the workpiece 1 is immersed, a substantially cylindrical carrying passage 12 for carrying the work 1 into the fluidized bed heating furnace main body 11, It consists of a substantially cylindrical unloading passage 13 for unloading the work 1 immersed in the fluidized bed heating furnace body 11. In the fluidized bed portion 11a of the fluidized bed heating furnace main body 11, a hole in which hot air is jetted upward is formed at the bottom of the furnace body 11b which is a substantially box shape in which the powder particles 2 are accumulated and linearly along the longitudinal direction. A large number of hot-air jet pipes 11c are arranged in a horizontal direction at predetermined intervals, and the granular material 2 is heated and fluidized by the hot air discharged from these hot-air jet pipes 11c.

  The fluidized bed heating furnace main body 11 is formed with a fluidized bed space portion 11d in which the exhaust gas discharged from the fluidized bed portion 11a is temporarily retained above the fluidized bed portion 11a in the furnace body 11b. It is also possible to dispose (pass) the workpiece 1 in the fluidized bed space 11d. And the heating conveyor 40 is arrange | positioned so that the workpiece | work 1 can pass the conveyance path | route R1 for heating formed in the carrying-in channel | path 12, the fluidized bed heating furnace main body 11, and the carrying-out channel | path 13.

  A plurality of heating conveyors 40 are disposed above the fluidized bed heating furnace 10 at a predetermined interval with respect to the conveying rails 41 extending along the longitudinal direction of the fluidized bed heating furnace 10, and the conveying rails 41. Each part is composed of a hanger body 42 and the like that is movable and moves while the work 1 is suspended by a chain 42a or the like. In addition, you may comprise so that the hanging position of the workpiece | work 1 can be raised / lowered with the hanger body 42 etc., and adjustment is possible. Further, the workpiece 1 is conveyed continuously or intermittently in the fluidized bed heating furnace 10 by the heating conveyor 40.

  Here, as shown in FIG. 1, one end of the carry-in passage 12 (the front end of the heating transport path R1) is a fluidized bed heating furnace inlet 12a through which the work 1 is introduced into the fluidized bed heating furnace 10, and the carry-in passage 12, the location of the fluidized bed heating furnace inlet 12a is the lowest and extends obliquely upward with respect to the transport direction to the fluidized bed heating furnace main body 11 (specifically, the fluidized bed space 11d of the fluidized bed heating furnace main body 11). The connection portion 12b is formed to be the highest. The fluidized bed heating furnace main body 11 extends horizontally in the conveying direction, and when the work 1 is introduced into the fluidized bed heating furnace main body 11, it is immersed in the fluidized bed portion 11a and heated while being conveyed. . On the other hand, one end of the carry-out passage 13 (the rear end of the heating conveyance path R1) is a fluidized-bed heating furnace outlet 13a from which the workpiece 1 is taken out from the fluidized-bed heating furnace 10, and in the carry-out passage 13, the fluidized bed heating furnace The connection part 13b with the main body 11 (specifically, the fluidized bed space part 11d of the fluidized bed heating furnace body 11) is the highest, extends obliquely downward with respect to the transport direction, and the location of the fluidized bed heating furnace outlet 13a is the lowest. Are arranged as follows.

  As shown in FIG. 3, the curing furnace 30 that promotes the coating hardening of the workpiece 1 after painting is U-shaped in plan view so that the workpiece 1 after painting can be U-turned in the curing furnace 30. In addition, the fluidized bed heating furnace 10 is disposed at a substantially upper position, in this embodiment, on both sides obliquely above. In addition, as shown in FIG. 2, the partition wall that partitions the fluidized bed heating furnace 10 and the curing furnace 30 is formed with a large number of communication passages (communication holes) 25 communicating between these furnaces. 25, the exhaust gas of the fluidized bed heating furnace 10 is introduced into the curing furnace 30. The exhaust gas accelerates the coating hardening of the workpiece 1 after coating. The U-turn portion (curved path portion) of the curing furnace 30 has the same height as the main body portion 31 of the curing furnace 30, while the carry-in passage portion 32 of the curing furnace 30 is inclined toward the downstream side in the transport direction. The carry-out passage portion 33 of the curing furnace 30 is formed so as to be inclined downward toward the downstream side in the transport direction. Thereby, the entrance 32 a and the exit 33 a of the work 1 of the curing furnace 30 are arranged lower than the main body 31 of the curing furnace 30.

  A curing conveyor 50 as a curing conveying means for moving the workpiece 1 along the curing conveying path R2 in the curing furnace 30 is positioned above the curing furnace 30 in the longitudinal direction of the curing furnace 30. A plurality of transport rails 51 extending along the transport rail 51 are arranged at predetermined intervals with respect to the transport rail 51, and each part can run freely and move in a state where the workpiece 1 is suspended by a chain 52 a or the like. Etc. The curing conveyor 50 allows the workpiece conveyance path (curing conveyance path R2) in the curing furnace 30 to have a U-turn shape, similar to the shape of the curing furnace 30. In addition, you may comprise so that the hanging position of the workpiece | work 1 can be raised / lowered with the hanger body 52 etc., and adjustment is possible. The workpiece 1 is conveyed continuously or intermittently in the curing furnace 30 by the curing conveyor 50.

  Further, an exhaust suction hole 36 and an exhaust suction passage 37 for sucking the exhaust gas in the curing furnace 30 are provided at an upstream end portion and a downstream end portion in the main body portion 31 of the curing furnace 30 with respect to the workpiece conveyance direction. The exhaust sucked from the inside of the furnace 30 is removed by passing through the dust collector 23 and then collected on the blower 22 side. Then, the recovered exhaust gas is heated by the hot air generator (electric heating device) 21 so as to be sent again to the fluidized bed heating furnace 10 and the curing furnace 30 and circulated.

  Further, in the casting pre- and post-coating heating apparatus 100 configured as described above, the casting heated in the fluidized bed heating furnace 10 at a position facing the fluidized bed heating furnace outlet 13a and the inlet 32a of the curing furnace 30. A coating apparatus 110 for coating the workpiece 1 is provided. Further, in the vicinity of the coating apparatus 110, a transfer robot 120 that transfers the workpiece 1 between the fluidized bed heating furnace 10 and the coating apparatus 110 and between the coating apparatus 110 and the curing furnace 30 is disposed. The transport robot 120 transports the heated workpiece 1 sent to the exit portion of the fluidized bed heating furnace 10 to the coating apparatus 110 and introduces the workpiece 1 coated by the coating apparatus 110 into the curing furnace 30 introduction position. Transport to. The coating equipment 200 is configured by the pre- and post-coating heating apparatus 100, the coating apparatus 110, and the transfer robot (transfer means) 120.

  In the above configuration, the workpiece 1 is continuously (or intermittently) introduced from the fluidized bed heating furnace inlet 12a in the pre- and post-coating heating apparatus 100, passed through the carry-in passage 12 of the fluidized bed heating furnace 10, and then conveyed. However, it is immersed in the fluidized bed part 11a of the fluidized bed heating furnace body 11 and heated (heat treatment before coating). And after taking out from the fluidized-bed part 11a of the fluidized-bed heating furnace main body 11 and passing the carrying-out channel | path 13, it is introduce | transduced into the coating apparatus 110 by the conveyance robot 120, and is painted. Further, the workpiece 1 painted by the coating apparatus 110 is transferred to the curing furnace 30 side by the transfer robot 120, and is introduced into the curing furnace 30 by the curing conveyor 50 in the curing furnace 30. Heating by the exhaust gas (heat treatment after painting) accelerates the curing of the coating of the workpiece 1, and thereafter, the workpiece (casting 1) for which the curing of the coating has finished is continuously (from the outlet 33 a of the curing furnace 30 ( (Or intermittently).

  According to the above configuration, since the workpiece 1 made of casting is heated by immersing it in the fluidized bed portion 11a using the granular material 2 as a heat medium, the workpiece 1 that is the casting before coating is heated at high speed and with good thermal efficiency. can do. That is, since the workpiece is immersed and heated in the fluidized bed portion 11a using the granular material 2 as a heat medium, the workpiece 1 can be subjected to local overheating, etc. at high speed and evenly from the entire surface as compared with a gas atmosphere furnace or the like. It can be stably heated without being generated, and the installation space can be kept relatively small. Further, since the heating heat source of the hot air generator 21 is an electric heater, even if hot air heated by the electric heater is introduced into the fluidized bed heating furnace 10 and the curing furnace 30 and heated, the combustion gas is generated. There is no need to recover the retained heat of the recovered exhaust gas with a heat exchanger or to introduce oxygen or cold air to use it for combustion air as in the case of introduction, and recover the exhausted hot air Thus, extremely high thermal efficiency can be maintained by circulating and using not only the fluidized bed heating furnace 10 but also the curing furnace 30. Moreover, since both the heating before painting and the heating after painting can be performed by one hot air generator 21, the equipment cost can be reduced and the installation space can be reduced as compared with the case where the heating heat sources are individually provided. It can be kept small.

  Further, by providing the curing furnace 30 above the fluidized bed heating furnace 10 (in the oblique direction in this embodiment), only the communication passage 25 that connects the fluidized bed heating furnace 10 and the curing furnace 30 is provided. Thus, the exhaust gas of the fluidized bed heating furnace 10 is naturally easily introduced into the curing furnace 30 through the communication path 25, and the exhaust gas discharged from the fluidized bed heating furnace 10 is actively sent to the curing furnace 30. It is not necessary to provide a separate blower or the like, which can reduce the manufacturing cost and the operation and maintenance cost.

  Further, as described above, the fluidized bed heating furnace 10 is provided with the carry-in passage 12 and the carry-out passage 13, and the fluidized bed heating furnace inlet 12a and the fluidized bed heating furnace outlet 13a are connected to the fluidized bed heating furnace main body 11, the carry-in passage 12 and the carry-out passage. Since it is disposed lower than the connecting portions 12 b and 13 b with the passage 13, the high-temperature exhaust gas discharged from the fluidized bed portion 11 a of the fluidized bed heating furnace main body 11 (that is, easily collected upward) is introduced into the carry-in passage 12 and the carry-out passage 13. As a result, the decrease in the thermal efficiency of the fluidized bed heating furnace 10 can be minimized. Therefore, in order to process the workpiece 1 continuously or intermittently, it is possible to maintain a relatively high thermal efficiency while having a configuration in which an opening / closing door for exhaust gas outflow cannot be provided in the middle of the conveyance path.

  Further, since the inlet 32a and the outlet 33a of the work 1 of the curing furnace 30 are arranged lower than the main body 31 of the curing furnace 30, the high temperature introduced into the curing furnace 30 (that is, it tends to accumulate upward). Exhaust gas is less likely to be discharged from the inlet 32a and the outlet 33a of the curing furnace 30, so that the thermal efficiency of the curing furnace 30 can be minimized. Therefore, even in this configuration, in order to process the workpiece 1 continuously or intermittently, a configuration in which an opening / closing door for exhaust gas outflow and the like cannot be provided in the conveyance path can maintain a relatively high thermal efficiency.

  In addition, as described above, the post-coating heating (curing) can be performed over a long distance with substantially the same length as the fluidized bed heating furnace 10 by making the curing conveyance path R2 into a U-turn shape. However, the installation area and installation space of the pre- and post-coating heating apparatus 100 can be minimized.

  Moreover, according to said structure, as the casting coating equipment 200 of this invention, the said coating back-and-front heating apparatus 100, the coating apparatus 110, and the conveyance robot 120 as a conveyance means which conveys the workpiece | work 1 among these are provided. By providing, a casting can be continuously coated. In addition, by disposing the coating apparatus 110 at a position facing the fluidized bed heating furnace outlet 13a and the inlet 32a of the curing furnace 30, the workpiece 1 is transferred to the coating apparatus 110 of the pre- and post-coating heating apparatus 100. It can be performed quickly and the casting can be painted efficiently. In addition, although it is optimal when it coats using a powder paint as a painting method, it is not restricted to this, It can apply also to the method of painting using a liquid paint.

  Note that the position (time) at which the workpiece 1 is immersed in the fluidized bed portion 11a is a predetermined position corresponding to the shape of the transport rail 51 when the length of the suspension chain of the heating conveyor 50 is fixed. However, the present invention is not limited to this, and when the workpiece 1 can be controlled to freely move up and down by the hanger body 52 of the heating conveyor 50, the flow corresponds to the size and heat capacity of the workpiece 1. You may comprise so that the position (time) to immerse in the layer part 11a can be adjusted.

1 Workpiece (casting)
2 Powder (heat medium)
DESCRIPTION OF SYMBOLS 10 Fluidized bed heating furnace 11 Fluidized bed heating furnace main body 11a Fluidized bed part 11b Furnace body 11c Hot-air jet pipe 11d Fluidized bed space part 12 Carry-in passage 12a Fluidized-bed heating furnace inlet 13 Carry-out passage 13a Fluidized-bed heating furnace exit 21 Hot air generator ( Electric heating device)
DESCRIPTION OF SYMBOLS 22 Blower 23 Dust collector 25 Communication path 30 Curing furnace 31 Main-body part 32 Carry-in passage part 32a Inlet 33a Outlet 37 Exhaust suction passage 40 Heating conveyor (conveying means for fluidized bed)
50 Curing conveyor 100 Pre- and post-coating heating device 110 Coating device 120 Transfer robot 200 Coating equipment R1 Heating route R2 Curing route

Claims (6)

A casting pre- and post-coating heating device that heats a workpiece made of a casting before painting and also heats after the painting,
A fluidized bed heating furnace in which the granular material is used as a heat medium, and the workpiece before painting is immersed in the fluidized bed portion,
The heating heat source is an electrothermal heater, and a hot air generator that generates hot air that heats and flows the heat medium;
Exhaust gas discharged from the fluidized bed heating furnace is introduced, and a workpiece after coating is introduced, a curing furnace that promotes hardening of the coating of the workpiece,
A blower that collects exhaust gas discharged from the curing furnace and sends it to the hot air generator for heating, and sends the hot air to the fluidized bed heating furnace again.
An apparatus for heating before and after coating a casting, characterized by comprising:   A curing furnace is disposed substantially above the fluidized bed heating furnace, and the exhaust gas of the fluidized bed heating furnace is introduced into the curing furnace through a communication path that connects the fluidized bed heating furnace and the curing furnace. The casting pre- and post-coating heating apparatus according to claim 1, wherein The fluidized bed heating furnace is provided with a carry-in passage through which the work is carried into the fluidized bed heating furnace main body, and a carry-out passage through which the work from the fluidized bed heating furnace main body is carried out,
The fluidized bed heating furnace inlet provided at the end of the carry-in passage portion is disposed lower than the connection portion between the carry-in passage and the fluidized bed heating furnace main body,
The casting of the casting according to claim 1 or 2, wherein an outlet of the fluidized bed heating furnace provided at an end portion of the unloading passage is disposed lower than a connection portion between the unloading passage and the fluidized bed heating furnace main body. Front and rear heating device.   3. A casting pre- and post-coating heating apparatus for castings according to claim 1 or 2, wherein the workpiece inlet and outlet of the curing furnace are arranged lower than the main body of the curing furnace. The curing furnace is shaped so that the workpiece after painting can be U-turned in the curing furnace,
The casting pre- and post-coating heating apparatus according to any one of claims 1 to 4, wherein the workpiece conveying path in the curing furnace is U-turned.   The casting pre- and post-coating heating device according to any one of claims 1 to 5, a coating device, and a workpiece heated in a fluidized bed heating furnace to a coating device and a workpiece coated with the coating device. A casting coating facility comprising a conveying means for conveying to a curing furnace.

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