JP5384226B2 - Hot air heating device - Google Patents

Description

  The present invention relates to a hot air processing apparatus for performing heat treatment on a workpiece such as an aluminum alloy with hot air.

  Conventionally, for example, a hot air circulation type or a multistage hearth rotary type has been used to heat-treat a workpiece such as an aluminum alloy. The former has the advantage that the temperature in the furnace can be reduced and the quality can be stabilized, and the latter can save space in the heat treatment facility. Further, a hot air circulation furnace combining such a hot air circulation type and a multistage hearth rotary type is also disclosed (for example, see Patent Document 1).

JP 2008-138916 A

  As shown in FIG. 12, the hot air circulating furnace 30 described in Patent Document 1 includes a plurality of storage chambers 31 on which workpieces W are placed in a donut shape and a multistage manner, and the hot air sent to the donut shape central portion 32 is supplied. Then, the doughnut-shaped central portion 32 is sent to the storage chamber 31 located around the doughnut-shaped central portion 32, moved horizontally from the inner surface side to the outer surface side of the storage chamber 31, and then circulated through the ring passage 33. Thereby, the workpiece | work W mounted in the some storage chamber 31 is heat-processed.

  The hot air circulating furnace 30 has the advantages that the temperature variation in the furnace can be reduced and a large number of workpieces W placed in the plurality of storage chambers 31 can be heat-treated simultaneously.

  However, in the invention described in Patent Document 1, since hot air is sequentially sent from the upstream to the downstream with respect to the workpiece W, the innermost workpiece W among the three workpieces W placed in the respective storage chambers 31. The hottest hot air acts on the workpiece W placed on the outer surface side, and the hot air whose temperature is reduced by the heat absorbed by the workpiece W on the inner surface side acts on the workpiece W placed on the outer surface side. Accordingly, since all the workpieces W cannot be heated uniformly, the quality of the workpieces W varies.

  Accordingly, an object of the present invention is to provide a hot air processing apparatus that can uniformly heat all the workpieces and hardly causes variations in quality of the workpieces.

In order to achieve the above object, a hot air heating device (1) according to claim 1 of the present invention comprises a cylindrical hot air chamber (3) to which hot air from a burner (2) is supplied, and the hot air chamber. A heating chamber (4) formed so as to surround (3) and supplied with hot air from the hot air chamber (3), and adjacent to the outer periphery of the hot air chamber (3) in the heating chamber (4) A plurality of shelves (5) on which the work (W) is mounted, which are arranged in a radial and multi-stage fashion and are rotatable about the hot air chamber (3), and which heat-treats the work (W) A device (1), which communicates with the hot air chamber (3), supplies hot air from the hot air chamber (3) to the inside, and supplies hot air from above to the work (W). A hollow chamber (6) having a plurality of hot air outlets (7) is formed on the shelf (5). Further, the hot air chamber (3) is divided into two by a hot air chamber partition plate (17) extending vertically, and the heating chamber (4) is divided into two. 18), is divided Rutotomoni provided at a position not interfering with the extending collinearly and the rotatable shelf (5) in the hot air chamber partition plate (17) in plan view, the burner (2) to the two Each hot air chamber (3) is provided .

  Moreover, the hot air heating device (1) according to claim 2 is characterized in that a wall is provided on the side of the shelf (5) on the side of the hot air chamber (3) to block hot air from the side.

  According to the hot air heating device of the first aspect of the present invention, the hot air intake port that communicates with the hot air chamber and takes the hot air of the hot air chamber into the inside, and the plurality of hot air outlets that supply the hot air to the work from above are provided. Since the formed hollow chamber is provided above the shelf, all the workpieces can be heated uniformly.

That is, even when a plurality of workpieces are placed in the radial direction from the hot air chamber side to the outer peripheral side on the shelf, hot air from above is applied to all the workpieces from the hot air outlet of the chamber, regardless of the placement location. Therefore, there is no workpiece heated by hot air that has been absorbed by other workpieces and has fallen in temperature. Therefore, all the workpieces can be heated evenly.
In addition, since the chambers are provided above the respective shelves, the work can be uniformly heated even if the shelves are provided in multiple stages.
In addition, the heating chamber partition plate that divides the hot air chamber into two by the hot air chamber partition plate and divides the heating chamber into two portions is located on the same line as the hot air chamber partition plate and does not interfere with the rotating shelf Therefore, the hot air having different temperatures supplied from the divided hot air chambers is not easily mixed in the heating chamber. Therefore, for example, the temperature of the heating chamber on the low temperature side is difficult to be raised due to the influence of the heating chamber on the high temperature side, and thus it is easy to control each temperature of the heating chamber.

  Moreover, according to the hot air heating apparatus of Claim 2, in addition to the effect of the invention of Claim 1, since the wall was provided in the hot air chamber side of the shelf and the hot air from the side was interrupted, Hot air can be supplied to the workpiece only from above. Therefore, the workpiece can be heated more uniformly.

It is a top view which shows the heating installation provided with two hot-air heating apparatuses which concern on embodiment of this invention. It is the sectional view on the AA line of FIG. It is an enlarged view of the hot air heating apparatus shown in FIG. It is an enlarged view of the hot air heating apparatus shown in FIG. It is a side view which shows the hot air chamber partition plate and heating chamber partition plate in the hot air heating apparatus of FIG. It is a principal part enlarged view which shows the chamber of the hot air heating apparatus shown in FIG. 2 and FIG. It is sectional drawing which shows the other aspect of the chamber in the hot air heating apparatus which concerns on this invention. It is sectional drawing which shows the further another aspect of the chamber in the hot air heating apparatus which concerns on this invention. It is a top view which shows the state which the rotation floor surface of the turntable shown in FIG. 3 rotated. It is a graph which shows the temperature change of the workpiece | work heated by the hot air heating apparatus which concerns on this invention, and the hot air heating apparatus which concerns on a prior art example. It is sectional drawing which shows the hot air heating apparatus which concerns on other embodiment. It is sectional drawing which shows the hot air heating apparatus which concerns on a prior art example.

  With reference to FIG. 1 thru | or FIG. 6, the hot-air heating apparatus 1 which concerns on embodiment of this invention is demonstrated. FIG. 1 is a plan view showing a heating facility provided with two hot-air heating devices 1, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 3 is an enlarged view of the hot air heating apparatus 1 shown in FIG. 1, and FIG. 4 is an enlarged view of the hot air heating apparatus 1 shown in FIG. FIG. 5 is a side view showing a hot air chamber partition plate and a heating chamber partition plate in the hot air heating apparatus of FIG. 1. FIG. 6 is an enlarged view of a main part showing the chamber 6 of the hot air heating device 1 shown in FIGS. 2 and 4.

  The hot air heating device 1 is for performing a heat treatment on a workpiece W such as an aluminum alloy, and includes a hot air chamber 3, a heating chamber 4, and a shelf 5.

The hot air chamber 3 has a cylindrical shape that extends vertically, and has an opening at the top and a bottom at the bottom. A plurality of hot air intakes 20 through which the heating chamber 4 takes hot air from the hot air chamber 3 are formed on the wall surface 3 a forming the hot air chamber 3. Hot air from the burner 2 is received into the hot air chamber 3 from above. Hot air that has entered from above does not leak out to the outside (heating chamber 4) from locations other than the hot air chamber intake 20. In the center of the hot air chamber 3, a fixed shaft 8 is provided in the vertical direction for the purpose of supporting the hot air chamber 3.
In the present embodiment, the burner 2 and the hot air chamber 3 are communicated with each other by the duct 15, and a fan is provided in a portion adjacent to the burner 2 inside the duct 15 (may be between the burner 2 outside the duct 15 and the duct 15). 13 was provided. In addition, since the sand S adheres to the work W in the molding process of the work W and the sand S accumulates on the floor surface of the hot air heating device 1, the fan 13 considers durability to the sand S. The sirocco radical fan instead of the axial fan. The hot air from the burner 2 is supplied to the hot air chamber 3 and the heating chamber 4 through the duct 15 by the fan 13 at a high speed (10 to 15 m / s).

  The heating chamber 4 is provided around the hot air chamber 3 so as to surround the hot air chamber 3, and receives the hot air from the hot air chamber 3 from the inner peripheral side thereof. That is, the heating chamber 4 refers to the inside of the hot air heating apparatus 1 excluding the hot air chamber 3 and the duct 15. Under the heating chamber 4, a rotatable turntable 16 having a donut-shaped rotating floor surface 16 a surrounding the hot air chamber 3 is provided. In addition, rotation of the rotating floor 16a of the turntable 16 is performed by the motor 14 provided in the lower part thereof.

The shelf 5 is for placing the work W to be heat-treated, and is arranged on the rotating floor 16a of the turntable 16. The shelves 5 are arranged in a radial pattern so as to be adjacent to the outer periphery of the hot air chamber 3, and are provided in a multi-stage shape (here, four stages). A group of the shelves 5 in the height direction formed in a multi-stage shape is referred to as a block here, and eight blocks are provided for one hot air heating device. A plurality of workpieces W can be placed side by side on each shelf 5 in the radial direction and the circumferential direction. The radial direction refers to the direction from the center of the hot air chamber 3 toward the outer circumferential direction, and the circumferential direction refers to the rotational direction of the rotating floor 16a.
Further, between the shelves 5 on the rotary floor surface 16a of the turntable 16, that is, between the blocks, eight partition plates 19 for shelves that extend radially and vertically from the outer periphery of the hot air chamber 3 are provided. The shelf partition plate 19 extends upward to substantially the same height as the hot air chamber 3, but the shelf partition plate 19 does not interfere with any part when the rotating floor surface 16 a of the turntable 16 rotates. Absent.

  In this hot air heating device 1, the hot air chamber 3 and the heating chamber 4 each supply hot air having a temperature higher than the set target temperature of the workpiece W, and hot air having substantially the same temperature as the set target temperature of the workpiece W. The second zone Q is divided into two. That is, the hot air chamber 3 is divided into two substantially at the center by the hot air chamber partition plate 17 extending vertically, and the heating chamber 4 is separated by the heating chamber partition plate 18 extending on the same line as the hot air chamber partition plate 17 in plan view. It is divided into two.

Here, in the present embodiment, the shelf 5 rotates together with the rotating floor surface 16 a of the turntable 16, so that the heating chamber partition plate 18 is provided only at a position that does not interfere with the rotation of the shelf 5. Specifically, as shown in FIG. 5, the heating chamber partition plate 18 has two openings 18a above the rotating floor surface 16a of the turntable 16, and the wall surface 3a of the hot air chamber 3 is separated between the openings 18a. The hot air chamber partition plate 17 is provided. The upper end 17 a of the hot air chamber partition plate 17 is joined to the heating chamber partition plate 18. Therefore, heat cannot be directly exchanged between the first zone P and the second zone Q of the heating chamber 4 except for the opening 18 a of the heating chamber partition plate 18.
The first zone P of the hot air chamber 3 and the first zone P of the heating chamber 4 are the same in plan view, for example, the first zone P of the hot air chamber 3 is on the right side and the second zone Q of the hot air chamber 3 is on the left side. If present, the first zone P of the heating chamber 4 is on the right side and the second zone Q of the heating chamber 3 is on the left side.

  Further, in each of the first zone P and the second zone Q, a first burner 2 a and a second burner 2 b are provided as dedicated burners 2. The first duct 15a extends from the first burner 2a to the first zone P of the hot air chamber 3, and from the second burner 2b to the second zone Q of the hot air chamber 3, the first duct 15a extends from the first burner 2a. A separate second duct 15b extends. Further, a guide wall 9 is provided for the purpose of smoothly returning the hot air in the heating chamber 4 to the duct 15.

  In the present embodiment, as shown in FIG. 6, a hollow chamber 6 is provided immediately above each shelf 5. The chamber 6 communicates with the hot air chamber 3 on the side and has a hot air intake port 20 for taking in the hot air of the hot air chamber 3 inside, and a plurality of chambers 6 arranged in the radial direction and the circumferential direction on the lower surface depending on the position of the work W A hot air outlet 7 is provided. That is, the chamber 6 in which a plurality of hot air intake ports 20 formed on the wall surface 3 a of the hot air chamber 3 above the position of each shelf 5 are opened to the side larger than the opening amount of the hot air intake port 20 is formed. Cover each one. Then, hot air is supplied uniformly from above the hot air outlet 7 to all the workpieces W placed on the shelf 5 along the radial direction. Since the side of the shelf 5 on the hot air chamber 3 side is the wall surface 3a forming the hot air chamber 3, hot air is not supplied from the side to the workpiece W.

In addition, the hot air outlet 7 can be opened and closed. For example, each time the type of the workpiece W to be heat-treated is changed, the size of the workpiece W, the number of workpieces W placed on one shelf 5 and the position of the workpiece W are changed. Accordingly, it is possible to select which hot air outlet 7 is opened and the opening amount of the hot air outlet 7 can be selected.
Moreover, the upper wall 6a of the chamber 6 extends horizontally from the hot air chamber 3 toward the outer peripheral side, and inclines downward from the middle (approximately 1/3 of the outer peripheral side).

In addition to the form shown in FIG. 6, the chamber 6 has an entire upper wall 6 a inclined downward from the hot air chamber 3 side toward the outer peripheral side as shown in FIG. Moreover, as shown in FIG. 8, the upper wall 6a can be made horizontal from the hot air chamber 3 side toward the outer peripheral side, and the cross section of the chamber 6 can be made substantially rectangular.

  Further, the hot air heating device 1 is provided with an opening 4 a for carrying in and out the work W on the upstream side of the wall surface in the first zone P of the heating chamber 4. In FIG. 1, the rotating floor surface 16 a of the hot air heating device 1 on the upper side of the paper is a counterclockwise rotation, and the rotating floor surface 16 a of the hot air heating device 1 on the lower side of the paper is a clockwise rotation. In the vicinity of the opening 4a and outside the hot air heating device 1, one robot 10 that carries both the work W in and out is installed. Further, in the vicinity of the robot 10, a loading station 11 for loading the workpiece W from the outside and a loading station 12 for loading the workpiece W to the outside are provided one by one. These one robot 10, carry-in station 11, and carry-out station 12 can correspond to the two hot air heating devices 1 arranged close to each other.

  The hot air heating device 1 according to the present embodiment operates as follows. A case where the workpiece W such as an aluminum alloy is heated to 500 ° C. will be described. First, the first zone P is heated to 500 ° C. or higher (for example, 510 ° C.) by the first burner 2a, and the second zone Q is heated to 500 ° C. by the second burner 2b.

  Next, the workpiece W carried into the carry-in station 11 is grasped by the robot 10 and carried onto the shelf 5 installed in the heating chamber 4 of the first zone P from the opening 4a and mounted thereon. A plurality of the workpieces W can be placed side by side in the radial direction and the circumferential direction. The workpiece W placed on the shelf 5 is heated to 510 ° C. while moving with the rotational movement of the shelf 5. Here, since this 1st zone P is set to 510 degreeC, compared with the case where it sets to 500 degreeC, it can heat efficiently in a shorter time.

  Further, since a chamber 6 having a plurality of hot air outlets 7 arranged in the radial direction and the circumferential direction is provided on the lower surface immediately above the shelf 5, hot air is applied to all the workpieces W placed in the radial direction from above. Can be supplied evenly. Accordingly, all the workpieces W can be uniformly heated to 500 ° C. or more in a shorter time.

  The workpiece W heated to 500 ° C. or higher in the first zone P then moves to the second zone Q by the rotational movement of the shelf 5. Since the second zone Q is set to 500 ° C., the workpiece W heated to 500 ° C. or higher is gradually cooled to 500 ° C., and continues to rotate while maintaining the temperature. This completes the heat treatment.

  Note that the rotating floor surface 16a of the turntable 16 does not continue to rotate slowly at the same rotational speed, but the shelf partition plate 19 is identical to the heating chamber partition plate 18 in plan view as shown in FIG. The rotation stops when the position is on the line. Then, after a lapse of a predetermined time, it is rotated by 回 転 rotation (since there are eight shelf partition plates 19 in this embodiment), the shelf partition plate 19 is again aligned with the heating chamber partition plate 18. . After that, when a predetermined time elapses, the rotation is again 1/8.

  Then, after the workpiece W moves again to the first zone P together with the shelf 5, it is unloaded from the heating chamber 4 by the robot 10 through the opening 4a, mounted on the unloading station 12, and unloaded from there.

The hot air heating device 1 configured as described above divides the hot air chamber 3 into two by the hot air chamber partition plate 17, the duct 15 a extends from the first burner 2 a to the first zone P of the hot air chamber 3, and the second Since the duct 15b separate from the duct 15a extending from the first burner 2a extends to the second zone Q of the hot air chamber 3 from the burner 2b, each of the divided hot air chambers 3 can be controlled at different temperatures. . Therefore, hot air having different temperatures can be supplied to the heating chamber 4.
Then, the temperature of the hot air supplied to the first zone is set higher than the set target temperature of the workpiece, and the temperature of the hot air supplied to the second zone is set to substantially the same temperature as the set target temperature of the workpiece. Can be heated to a predetermined temperature in a short time. Therefore, the time required for a series of heat treatments can be shortened.
In addition, since the high-speed hot air is supplied to the hot air chamber 3 and the heating chamber 4 by the fan 13, the time required for increasing the temperature of the workpiece W is also shortened. Therefore, the entire heat treatment time can be further shortened.

Further, the heating chamber partition plate 18 that divides the heating chamber 4 into two is positioned so as not to interfere with the shelf 5 that extends on the same line as the hot air chamber partition plate 17 and rotates on the rotating floor surface 16a of the turntable 16. Since the hot air having different temperatures supplied from the divided hot air chamber 4 is supplied to the heating chamber 4, it is difficult to mix them. Therefore, since the second zone Q of the low temperature side heating chamber 4 is not easily affected by the first zone P of the high temperature side heating chamber 4, each temperature control of the heating chamber 4, that is, the temperature control of the workpiece W can be easily performed. .
In addition, since the shelf partition plate 19 extending radially up and down from the outer periphery of the hot air chamber 3 is provided between the shelves 5 on the rotating floor 16a of the turntable 16, the shelf partition plate 19 is connected to the heating chamber partition plate 18. It becomes a lid | cover with respect to the opening part 18a, and the hot air of the different temperature supplied from the divided hot air chamber 3 is hard to mix more. Therefore, it is easier to control the temperature of the workpiece W.

Further, a hollow chamber 6 communicating with the hot air chamber 3 and having a hot air intake port 20 for taking in the hot air of the hot air chamber 3 into the inside and a plurality of hot air outlets 7 for supplying hot air to the work W from above is a shelf. 5 is provided, there is no workpiece W heated by hot air that has been absorbed by other workpieces W and its temperature is lowered, and all the workpieces W can be heated uniformly. Therefore, the quality of all the workpieces W becomes uniform.
Furthermore, since the chambers 6 are provided above the respective shelves 5, the work can be uniformly heated even if the shelves 5 are provided in a multistage manner.
Moreover, since the side of the shelf 5 on the hot air chamber 3 side is a wall surface 3a forming the hot air chamber 3, the hot air is supplied to the work W only from above the work W, and the hot air is supplied from the side of the work W. Will not be supplied. Therefore, the workpiece W can be heated more uniformly.

  Further, since the hot air outlet 7 can be opened and closed, the hot air outlet 7 can be opened and closed according to the size and position of the workpiece W, and the workpiece W can be efficiently heated.

  Further, as shown in FIG. 7, the upper wall 6 a forming the chamber 6 is inclined downward toward the outer periphery, thereby attaching to the workpiece W placed on the shelf 5 positioned above the chamber 6. When the sand (sand-type sand) S falling, it can be rolled and dropped by the upper wall 6a. As a result, it is possible to prevent a situation where the sand S accumulates on the upper wall 6a of the chamber 6 and maintenance management becomes troublesome.

  Moreover, the hot air supplied to the chamber 6 can be concentrated by reflecting the hot air on the upper wall 6 a of the chamber 6 inclined downward, and can be effectively blown out from the hot air outlet 7. Thereby, powerful hot air can be supplied to the workpiece | work W and it can heat more effectively.

  Moreover, since the hot air heating apparatus 1 which concerns on this embodiment has provided the opening part 4a for carrying in and carrying out the workpiece | work W in the upstream of the 1st zone P of the heating chamber 4, the preset target temperature of the workpiece | work W is provided. It is difficult for heat to escape to the outside from the second zone Q of the heating chamber 4, which is set to substantially the same temperature. Therefore, the temperature management of the second zone Q of the heating chamber 4 is easy. Moreover, the workpiece | work W can be effectively heated up from the rotation upstream side to the downstream side of the 1st zone of the heating chamber 4 which is high temperature. Therefore, a stable quality workpiece W can be obtained.

  In the present embodiment, the hot air chamber 3 is divided into two and the two burners 2 are provided. However, the present invention is not limited to this, and the hot air chamber is divided into three or more and the number of divisions is determined. A number of burners 2 may be provided. By doing so, finer temperature control can be performed.

  Further, even when the hot air chamber 3 is not divided as shown in FIG. 11, as long as the hot air outlet 7 arranged in the radial direction is formed on the lower surface of the chamber 6 and the chamber 6 is formed, the radial direction is sufficient. Since all of the workpieces W arranged in a row can be heated uniformly, a workpiece W having a uniform quality can be obtained, which is beneficial. In this case, it is not necessary to provide a plurality of burners 2 having different temperature settings.

  Moreover, although the heating chamber 4 was divided into two by the heating chamber partition plate 18, the heating chamber 4 does not need to be divided. In this case, warm air having different temperatures is mixed in the heating chamber 4, but since the warm air after heating the workpiece W is mixed, the temperature control of the workpiece W is easier than in the conventional example. Needless to say, there is no influence in uniformly heating the workpieces W arranged in the radial direction.

  Furthermore, although the shelf partition plate 19 is provided between the shelves 5 on the rotating floor 16a of the turntable 16, the shelf partition plate 19 is not provided in the same manner as the heating chamber partition plate 18 is not necessary. May be.

  In addition, the temperature of the hot air supplied to the first zone P is set higher than the set target temperature of the work W, and the temperature of the hot air supplied to the second zone Q is set to be substantially the same as the set target temperature of the work W. The temperature of the hot air supplied to the first zone P may be set higher than the temperature of the hot air supplied to the second zone Q. By doing so, for example, after gradually raising the temperature of the workpiece with hot air supplied from the second zone Q, the workpiece W can also be heated at once with the hot air supplied from the first zone P, It is also possible to gradually cool the work W with the hot air in the second zone Q after the work is heated at a stretch with the hot air in the first zone P. That is, when a workpiece W other than an aluminum alloy is to be subjected to heat treatment, various types of heat treatment can be performed depending on the type of the workpiece W as necessary.

  Moreover, although the opening part 4a was provided in the wall surface of the heating chamber 4, carrying in and carrying out of the workpiece | work W is not restricted from this opening part 4a.

  Further, the side of the hot air chamber 3 on the side of the shelf 5 is the wall surface 3a of the hot air chamber 3, and hot air is not supplied to the work W from the side. In addition, hot air may be supplied from the side. Here, the temperature of the workpiece W on the radial hot air chamber 3 side is higher than that of the workpiece W on the outer side in the radial direction, but even in this case, the hot air is evenly applied to all the workpieces W arranged in the radial direction from above. Therefore, it is possible to uniformly heat the workpieces W arranged in the radial direction as compared with the conventional example.

  Moreover, although the hot air blower outlet 7 which supplies a hot air to the workpiece | work W from the upper direction was provided in the lower surface of the chamber 6, hot air was supplied only from the side of the workpiece | work W like the prior art, without providing the chamber 6 itself. Also good. That is, if the hot air chamber 3 is divided and hot air having different temperature settings is supplied to each of the hot air chambers 3 from the number of burners 2 corresponding to the number of divisions, the heat treatment time is shortened compared to the conventional example. can do.

  Although the hot air outlet 7 can be opened and closed, there is no problem if the type of the workpiece W and the position on the shelf 5 do not change even if the hot air outlet 7 cannot be closed.

Further, although eight shelves 5 are provided in a radial manner, each is provided in four stages, but the number of shelves 5 is not limited thereto.
Further, although the rotating floor 16a of the turntable 16 is repeatedly stopped and rotated, it may continue to rotate slowly at the same rotation speed.

DESCRIPTION OF SYMBOLS 1 Hot-air heating apparatus 2 Burner 2a 1st burner 2b 2nd burner 3 Hot-air chamber 3a Wall surface 4 Heating chamber 4a Opening part 5 Shelf 6 Chamber 6a Upper wall 7 Hot-air outlet 8 Fixed shaft 9 Guide wall 10 Robot 11 Carry-in station 12 Carry-out station DESCRIPTION OF SYMBOLS 13 Fan 14 Motor 15 Duct 15a 1st duct 15b 2nd duct 16 Turntable 16a Rotating floor 17 Hot air chamber partition plate 17a Upper end 18 Heating chamber partition plate 18a Opening 19 Shelf partition plate 20 Hot air intake 30 Hot air circulation Furnace 31 Containment chamber 32 Donut center 33 Ring passage P First zone Q Second zone S Sand W Workpiece

Claims (2)

A cylindrical hot air chamber to which hot air from a burner is supplied;
A heating chamber that is formed so as to surround the hot air chamber and is supplied with hot air from the hot air chamber;
The heating chamber includes a plurality of shelves that are radially and multi-staged so as to be adjacent to the outer periphery of the hot air chamber, and that are rotatable around the hot air chamber, and on which the workpiece is mounted, and heat-treat the workpiece. A hot air heating device to be applied,
A hollow chamber formed with a hot air intake port that communicates with the hot air chamber and takes in hot air from the hot air chamber and a plurality of hot air outlets that supply hot air to the work from above is formed above each of the shelves. Furthermore, the hot air chamber is divided into two by a hot air chamber partition plate extending vertically, and the heating chamber partition plate that divides the heating chamber into two is collinear with the hot air chamber partition plate in plan view. hot air heating apparatus, wherein the extension and Rutotomoni provided at a position that does not interfere with the rotatable shelf, to the burner provided in each shed hot air chamber to the two on.   The hot air heating apparatus according to claim 1, wherein a wall is provided on a side of the shelf on the side of the hot air chamber to block hot air from the side.

Images