JP2014009879A - Rotary heat treatment furnace - Google Patents

Abstract

Disclosed is a rotary heat treatment furnace in which the quality of an object to be heated is less likely to vary and the structure is simple.
A substantially cylindrical furnace body 31 and a plurality of storage chambers 32a that are rotatably supported inside the furnace body 31 and store an object to be heated W are arranged in a radial and multi-stage manner in a central portion 32b. The storage rotary body 32 having a substantially donut shape in plan view in which a gap is formed, a rotation drive device 33 that rotates the storage rotary body 32, a fan 34 that sends hot air to the furnace body 31 side, and the fan 34 and the furnace body 31 A first flow path 35 communicating with each other, a cylindrical cylindrical wall 36 provided on the outside of the storage rotator 32 so as to be separated from the inner wall of the furnace body 31 and having a plurality of hot air intake ports 36a formed therethrough, A second flow path 37 that communicates between the lower end of the central portion 32b of the storage rotator 32 and the fan 34 is provided, and hot air from the fan 34 is transmitted from the outside of the storage rotator 32 through the hot air intake port 36a to the central portion. Send to 32b.
[Selection] Figure 2

Description

  The present invention relates to a rotary heat treatment furnace that heats an object to be heated such as an aluminum alloy by circulating hot air.

Conventionally, for example, in order to heat-treat an object to be heated such as an aluminum alloy, a heat treatment furnace such as a hot air circulation type or a multistage hearth rotary type has been used. 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.
A rotary heat treatment furnace combining such a hot air circulation type and a multistage hearth rotary type is also disclosed (for example, see Patent Document 1).

  As shown in FIG. 7, the rotary heat treatment furnace described in Patent Document 1 includes a housing body 11 in which a plurality of storage chambers 12a are arranged radially (in a multistage manner) in the furnace body 11 (storage chamber 12a). The heated object W is stored and the hot air sent into the central portion 12b is sent from the central portion 12b to the storage chamber 12a located around the hot air. And after moving a hot air to the outer surface side from the center part 12b side of the storage chamber 12a in the horizontal direction, it is made to circulate through an annular channel.

  According to the rotary heat treatment furnace 10 described in Patent Document 1, a plurality of storage chambers 12a are formed in a radial and multi-stage shape, and the object to be heated W is stored therein to perform heat treatment. Heat treatment can be performed on the heated object W.

However, in the invention described in Patent Document 1, since hot air is sent in one direction from one side to a plurality of objects to be heated W, for example, as shown in FIG. Is stored, it is not possible to uniformly heat all the articles to be heated W.
That is, first, the hottest hot air acts on the object to be heated W closest to the center portion 12b among the objects to be heated W to raise the temperature of the object to be heated W, while the hot air is applied to the object to be heated W. As a result of the heat absorption, the temperature decreases. Thereafter, the hot air whose temperature has been lowered acts on the outer heated object W to raise the temperature of the heated object W. In this way, the temperature of the hot air acting on the object to be heated W on the central portion 12b side is high, and the temperature of the hot air acting as the outer object to be heated W becomes low, so that all the objects to be heated W are uniformly distributed. It cannot be heated, and accordingly, the quality of the article to be heated W varies.

Therefore, the present applicant has already filed a patent application for a rotary heat treatment furnace in which quality variation countermeasures have been taken (see Patent Document 2).
As shown in FIG. 8, the rotary heat treatment furnace 10 is provided with a hollow chamber C corresponding to the storage chamber 12a, and hot air from the central portion 12b is passed through the hollow chamber C to all the objects to be covered. Hot air is supplied to the heated object W from above.

  According to the rotary heat treatment furnace 10 described in Patent Document 2, the hot air that heats the article to be heated W does not heat the other article to be heated W before heating the article to be heated W. The temperature of the hot air acting on the heated object W is substantially equal, and all the objects to be heated W can be heated uniformly.

Separately from this, a rotary heat treatment furnace in which hot air is applied to the article to be heated W from below is also disclosed (for example, see Patent Document 3).
In this rotary heat treatment furnace 20, as shown in FIG. 9, hot air is once sent to the furnace bottom by a fan 24, hot air is introduced into the lowermost storage chamber 22a, and the hot air is stored in the uppermost storage chamber 22a. Are sent in order.

JP 2008-138916 A JP 2011-7471 A JP 2004-257658 A

However, the invention described in Patent Document 2 has a problem that the chamber C must be provided in each of the storage chambers 12a, so that the structure becomes complicated and the cost increases accordingly.
In addition, when the number of the objects to be heated W stored in one storage chamber 12a is changed, the number and positions of the outlets formed on the lower surface of the chamber C where hot air blows toward the object to be heated W are changed. There is also a problem that must be done.

  Further, in the invention described in Patent Document 3, since hot air passes from the lowermost storage chamber 22a to the uppermost storage chamber 22a, the number of objects W to be heated on which the hot air acts during one round of hot air is reduced. Many. Therefore, in the uppermost storage chamber 22a through which the hot air finally passes, since the hot air has already been absorbed by the article to be heated W, the quality of the article to be heated W varies.

  Accordingly, an object of the present invention is to provide a rotary heat treatment furnace in which the quality of an object to be heated is less likely to vary and the structure is simple.

  In order to achieve the above object, a rotary heat treatment furnace (30) according to claim 1 of the present invention is rotatable in a substantially cylindrical furnace body (31) and inside the furnace body (31). The storage rotator (32) having a substantially donut shape in plan view in which a plurality of storage chambers (32a) for storing the object to be heated (W) are supported and arranged in a plurality of radial and multi-stage shapes and a gap is formed in the central portion (32b). ), A rotation drive device (33) for rotating the storage rotating body (32), a fan (34) for sending hot air to the furnace body (31) side, the fan (34) and the furnace body (31) The first flow path (35) that communicates with the rotary body (32) and the outer side of the storage rotating body (32) are spaced apart from the inner wall of the furnace body (31), and a plurality of hot air intake ports (36a) penetrate therethrough. A cylindrical cylindrical wall (36) formed in the storage rotor (32) A second flow path (37) communicating between the lower end of the portion (32b) and the fan (34), and hot air from the fan (34) is passed through the first flow path (35) to the furnace body. (31) and the hot air is sent from the outside of the storage rotating body (32) to the central portion (32b) via the hot air intake port (36a), and the hot air is further sent to the second flow path ( The hot air is circulated so as to return to the fan (34) from the central portion (32b) of the storage rotating body (32) through 37).

  Further, in the rotary heat treatment furnace (30) according to claim 2, the amount of opening of the hot air intake port (36a) is different between upstream and downstream of the rotation by the rotation drive device (33). It is characterized by.

  Further, the rotary heat treatment furnace (30) according to claim 3 is configured to rectify the hot air from the first flow path (35) to the hot air intake (36a) on the inner wall of the furnace body (31). A plate (38) is provided.

  Further, the rotary heat treatment furnace (30) according to claim 4 is characterized in that the rotary drive device (33) is disposed above the furnace body (31).

  Here, the symbols in the parentheses indicate corresponding elements or corresponding matters described in the drawings and the embodiments for carrying out the invention described later.

According to the rotary heat treatment furnace according to claim 1 of the present invention, a storage rotating body in which a plurality of storage chambers for storing an object to be heated are arranged, and a cylindrical shape in which a plurality of hot air intakes are formed to penetrate therethrough. Since the hot air is sent from the outside of the storage rotating body to the central portion through the hot air intake port, it can be heated uniformly regardless of the position of the stored object to be heated.
That is, the outside of the furnace body is at room temperature, while the inside of the furnace body is set to, for example, 500 to 600 degrees, and there is such a temperature difference between inside and outside of the furnace body. However, it is difficult to completely block the heat radiation from the furnace body to the outside, but in the present invention, the heat radiation is easy to dissipate, and it is arranged at the outer part of the storage rotating body that becomes lower temperature than the central part side. Since hot hot air is first applied to the heated object, a temperature difference due to the position of the stored heated object is unlikely to occur, and as a result, the quality of the heated object is unlikely to vary.
Moreover, since the structure of the rotary heat treatment furnace is simple, the manufacturing cost and maintenance cost of the rotary heat treatment furnace are low.
In addition, a second flow path communicating between the lower end of the central portion of the storage rotator and the fan is provided, and the hot air is circulated so as to return the hot air from the central portion of the storage rotator to the fan via the second flow path. Therefore, the foundry sand adhering to the object to be heated falls below the central part of the storage rotating body and is difficult to soar.
In addition, since there is a space above the storage rotating body, for example, as in the invention described in claim 4, the rotation driving device can be arranged above the furnace body.

Moreover, according to the rotary heat treatment furnace of claim 2, in addition to the operational effect of the invention of claim 1, the opening amount of the hot air intake is different between upstream and downstream of the rotation by the rotary drive device. As a result, the amount of hot air fed through the hot air intake port is different, and as a result, the amount of heat supplied to a plurality of objects to be heated can be controlled by only one fan.
That is, even in an environment where there is only one fan and only hot air at a constant temperature can be supplied, by increasing the amount of heat supplied to the object to be heated by increasing the opening amount of the hot air intake port on the upstream side of the rotation, The object to be heated can be heated rapidly, while on the downstream side of the rotation, the amount of heat supplied to the object to be heated is reduced by reducing the opening amount of the hot air intake port, so that the temperature is increased on the upstream side of the rotation. The object to be heated can be kept warm at that temperature.
Thus, even if there is only one fan, temperature control for each zone is possible.

  Further, according to the rotary heat treatment furnace described in claim 3, in addition to the effects of the invention described in claim 1 or 2, hot air from the first flow path is guided to the hot air intake port on the inner wall of the furnace body. Since the rectifying plate is provided, hot air can easily enter the storage chamber from the hot air intake port, and the temperature of the storage chamber can be increased efficiently.

According to the rotary heat treatment furnace described in claim 4, in addition to the operational effects of the inventions described in claims 1 to 3, the rotary drive device is disposed above the furnace body, so that the rotary drive device is heated. Troubles caused by foundry sand adhering to objects are unlikely to occur. In other words, when the rotary drive device is placed below the furnace body, the foundry sand falls into the rotary drive device and enters the interior, but if it is placed above the furnace body, such a situation does not occur. The frequency of maintenance of the apparatus can be reduced.
In addition, as in the case where the rotary drive device is disposed below the furnace body, it is not necessary to dive under heavy objects such as the furnace main body and the storage rotor during maintenance of the rotary drive device, so that the maintenance work can be performed safely. It can be carried out.
Furthermore, the structure in which the rotation drive device is disposed above the furnace body is simpler than the structure in which the rotation drive device is disposed below the furnace body.

  In addition, the point which sends a hot air to the center part from the outer side of a storing rotary body like the rotary heat processing furnace of this invention is not described at all in the patent documents 1 thru | or 3 mentioned above.

1 is a schematic perspective view showing a rotary heat treatment furnace according to a first embodiment of the present invention. It is a longitudinal cross-sectional view of the rotary heat treatment furnace shown in FIG. It is a cross-sectional view of the rotary heat treatment furnace shown in FIG. It is a longitudinal cross-sectional view which shows the rotary heat processing furnace which concerns on 2nd embodiment of this invention. It is a cross-sectional view of the rotary heat treatment furnace shown in FIG. It is a cross-sectional view showing a rotary heat treatment furnace according to a third embodiment of the present invention. It is a longitudinal cross-sectional view which shows the rotary heat processing furnace which concerns on a prior art example. It is a longitudinal cross-sectional view which shows the rotary heat processing furnace which concerns on another prior art example. It is a longitudinal cross-sectional view which shows the rotary heat processing furnace which concerns on another conventional example.

(First embodiment)
With reference to FIG. 1 thru | or FIG. 3, the rotary heat processing furnace 30 which concerns on 1st embodiment of this invention is demonstrated.
The rotary heat treatment furnace 30 is a heat treatment furnace for performing a heat treatment on an object to be heated W such as an aluminum alloy, and includes a furnace body 31, a storage rotating body 32, a rotation driving device 33, a fan 34, a first flow. A path 35, a cylindrical wall 36, and a second flow path 37 are provided.
And the rotary heat processing furnace 30 which concerns on this embodiment has the characteristics in the direction of the circulation of the hot air made to act on the to-be-heated material W especially.

The furnace body 31 has a substantially cylindrical wall surface 31a extending vertically, a ceiling 31b, and a furnace bottom 31c. In principle, the furnace body 31 is heat-insulated so that heat in the furnace body 31 is difficult to escape to the outside.
An opening 31d is formed in the furnace body 31 on the side opposite to the fan 34 described later, and a furnace door 31e is provided in the opening 31d.
And as shown in FIG. 1, the to-be-heated material W is carried in and carried out from the furnace main body 31 in the furnace main body 31 from this opening part 31d. The opening 31 d is opened at least as high as the storage rotator 32. In order to minimize heat dissipation from the opening 31d, the furnace door 31e may be divided in the height direction according to the number of stages of the storage chamber 32a described later.

The storage rotator 32 includes a plurality of storage chambers 32a in which the object to be heated W is stored in a radial and multistage manner, and a gap is formed in the central portion 32b. In other words, the storage rotary body 32 has a substantially donut shape in plan view. And it is rotatably supported inside the furnace body 31.
In addition, the inner side of the cylindrical central wall 32c constituting the central side of the storage chamber 32a is a void. This gap extends from the upper end to the lower end of the storage rotator 32.
The central wall 32c is formed with a hot air outlet which is a through hole, and thereby the respective storage chambers 32a communicate with the gaps in the central portion 32b.

Each of the storage chambers 32a has a fan shape in plan view, and eight storage chambers 32a are provided in the same horizontal plane. The storage chambers 32a are partitioned by a partition wall 32d extending radially from the central wall 32c to the cylindrical wall 36.
The storage rotator 32 is supported in a state of being hung from the rotation driving device 33 so as to be smoothly rotated. That is, the upper end and the lower end of the storage rotator 32 are not in contact with the furnace body 31, or even if they are in contact, the frictional resistance is small.
A plurality of articles to be heated W stored in one storage chamber 32a are arranged in the radial direction of the storage rotating body 32 (from the hot air intake port 36a to the hot air discharge port). Of course, when the object to be heated W is large, only one object to be heated W is stored in one storage chamber 32a.

The rotation drive device 33 is a power source that rotates the storage rotator 32, and is mounted on the ceiling 31 b of the furnace body 31.
In the present embodiment, as indicated by a broken-line arrow in FIG. 3, the rotation driving device 33 rotates the storage rotator 32 clockwise in plan view.
The central wall 32c of the storage rotator 32 extends to the rotation drive device 33, and the rotation drive device 33 rotates the entire storage rotator 32 by applying power to the center wall 32c. However, what means is used to rotate the storage rotator 32 is not limited to this.

In the state shown in FIG. 3 where one storage chamber 32a is the front of the opening 31d of the furnace body 31 and the workpiece W is easily carried in and out, the rotary drive device 33 is stopped. Then, after a predetermined time has elapsed, the rotary drive device 33 rotates the retracted rotating body 32 by 1/8 rotation, and stops rotating when the state shown in FIG. 3 is reached again. After that, when the predetermined time has elapsed, the storage rotator 32 is rotated 1/8 again.
Thus, the rotation drive device 33 repeats the operation and the stop, and rotates the retractable rotating body 32 intermittently.

The fan 34 is provided outside the furnace body 31 and sends hot air from a burner 39 (which may be another heat source such as a heater) to the furnace body 31 side. That is, the discharge port of the fan 34 faces the furnace body 31 side, and the suction port of the fan 34 faces the burner 39 side.
As the fan 34, an axial fan, a sirocco radical fan, or the like can be used.
One fan 34 and one burner 39 are provided for each rotary heat treatment furnace 30.

The first flow path 35 is provided from the wall surface 31 a of the furnace body 31 and communicates between the fan 34 and the furnace body 31.
Similarly to the furnace body 31, the outside of the first flow path 35 is in a normal temperature atmosphere, and therefore, a predetermined heat insulation process is performed so that heat does not easily escape from the first flow path 35 to the outside.

The cylindrical wall 36 is a cylindrical wall provided on the outer side of the storage rotating body 32 so as to be separated from the inner wall of the furnace body 31. There is a gap between the cylindrical wall 36 and the tip of the partition wall 32d of the storage rotator 32 (the radially outward end) so that the storage rotator 32 can rotate inside the cylindrical wall 36. The partition wall 32d of the storage rotating body 32 does not interfere with the cylindrical wall 36.
Further, the cylindrical wall 36 is fixed to the furnace body 31, unlike the storage rotator 32, and the cylindrical wall 32 does not rotate even when the storage rotator 32 rotates.
A space between the inner wall of the furnace body 31 and the cylindrical wall 36 is an annular flow channel 41 that is continuous with the first flow channel 35.

The storage rotator 32 rotates with time. For example, as shown in FIG. 3, each storage chamber 32 a faces the opening 31 d of the furnace body 31 and rotates in a state where the heated object W is easily carried in and out. A plurality of hot air intake ports 36a are formed through the cylindrical wall 36 so as to correspond to the storage chamber 32a.
Specifically, on the immediately downstream side of the storage chamber 32a for carrying in and out the article to be heated W, there are three hot air intake ports 36a for one storage chamber 32a and three storage chambers 32a (FIG. 3). The hot air intake port 36a was formed only in the three storage chambers 32a located above. Further, on the downstream side, two hot air intake ports 36a are formed for one storage chamber 32a, and the hot air intake ports 36a are formed by two storage chambers 32a. Further, on the downstream side, one hot air intake port 36a is formed for one storage chamber 32a, and the hot air intake port 36a is formed by two storage chambers 32a.
That is, the hot air intake port 36a is formed in the cylindrical wall 36 so that a large amount of hot air acts on the article W to be heated immediately after being stored in the storage chamber 32a.
Here, the sizes of the hot air intake ports 36a are all equal.
As described above, the opening amount of the hot air intake port 36a is different between upstream and downstream of the rotation by the rotation driving device 33.
Although FIG. 1 is a diagram in which a hot air intake port 36a is formed in the storage chamber 32a, this diagram is merely expressed in this way for convenience of explanation in order to explain the outline. As described above with reference to FIG. 3, the hot air intake port 36 a is formed in the cylindrical wall 36.
Here, a portion of the cylindrical wall 36 facing the opening 31b of the furnace body 31 is formed with a carry-in / out port 36b that is opened larger than the hot air intake port 36a in order to carry the article to be heated W into the storage chamber 32a. ing.

The second flow path 37 is provided from the lower end of the central portion 32 b of the storage rotator 32, and communicates between the lower end of the central portion 32 b of the storage rotator 32 and the fan 34.
A burner 39 is provided in the middle of the second flow path 37, and hot air that has been absorbed by the article to be heated W and has a reduced temperature is reheated in the second flow path 37 by the burner 39.
Of course, in the second flow path 37 as well as the first flow path 35, a predetermined heat insulation treatment is performed.

Next, the circulation of hot air in the rotary heat treatment furnace 30 configured as described above will be described.
First, hot air from the fan 34 is sent into the furnace body 31 (annular flow path 41) via the first flow path 35.
Next, the hot air is divided into two branches from the junction of the first flow path 35 and the annular flow path 41 and flows into the annular flow path 41.
Next, the hot air is sent from the outside of the storage rotating body 32 (storage chamber 32a) to the central portion 32b through the hot air intake port 36a. At this time, it acts on the article to be heated W stored in the storage chamber 32a, and accordingly, the hot air is absorbed and the temperature is lowered.
The hot air collected at the central portion 32 b of the storage rotator 32 flows out from the lower end of the central portion 32 b of the storage rotator 32 via the second flow path 37.
The hot air is heated by the burner 39 and then returns to the fan 34.
In this way, the article to be heated W is heated by the hot air flowing from the outside toward the center portion 32b.

According to the rotary heat treatment furnace 30 configured as described above and circulating hot air, the storage rotary body 32 in which a plurality of storage chambers 32a for storing the article to be heated W are arranged, and the hot air intake ports 36a pass through a plurality. Since the hot air is sent from the outside of the storage rotating body 32 to the central portion 32b through the hot air intake port 36a, it is uniform regardless of the position of the stored heated object W. Can be heated.
That is, the outside of the furnace body 31 is normal temperature, while the inside of the furnace body 31 is set to, for example, 500 to 600 degrees, and there is such a temperature difference between the inside and outside of the furnace body 31. Although it is difficult to completely block the heat radiation from the furnace body 31 to the outside even if the heat insulation treatment is performed, in this embodiment, it is easy to radiate the heat and the storage rotation becomes lower than the central portion 32b side portion. Since hot hot air is first applied to the object to be heated W arranged on the outer portion of the body 32, a temperature difference due to the position of the stored object to be heated W hardly occurs. As a result, the quality of the object to be heated W is improved. Difficult to occur.

Further, even if the number of objects to be heated W stored in one storage chamber 32a is changed, it is not necessary to change the configuration of the rotary heat treatment furnace 30 for heating.
Moreover, since the structure of the rotary heat treatment furnace 30 is simple, the manufacturing cost and maintenance cost of the rotary heat treatment furnace 30 are low.

Furthermore, a second flow path 37 that communicates between the lower end of the central portion 32b of the storage rotator 32 and the fan 34 is provided, and hot air is allowed to flow below the central portion 32b of the storage rotator 32 so that the second flow path 37 is Since the hot air is circulated so as to return from the central portion 32b of the storage rotator 32 to the fan 34, the foundry sand adhering to the article to be heated W falls below the central portion 32b of the storage rotator 32 and soars. hard.
Further, since there is a space above the storage rotator 32, the rotation drive device 33 can be disposed above the furnace body 31.

Moreover, since the opening amount of the hot air intake port 36a is made different between upstream and downstream of the rotation by the rotation drive device 33, the amount of hot air fed through the hot air intake port 36a becomes different, respectively. As a result, the amount of heat supplied to the plurality of objects to be heated W can be controlled by only one fan 34.
That is, even in an environment in which there is only one fan 34 and only hot air having a constant temperature can be supplied, the amount of heat supplied to the article to be heated W is increased by increasing the opening amount of the hot air intake port 36a on the upstream side of the rotation. Thus, the object to be heated W can be rapidly heated. On the other hand, by reducing the amount of heat supplied to the object to be heated W by reducing the opening amount of the hot air intake port 36a on the downstream side of the rotation, It is possible to keep the heated object W heated at the upstream side at that temperature.
Thus, even if there is only one fan 34 and one burner 39, temperature control for each zone is possible.

Furthermore, since the rotation drive device 33 is disposed above the furnace body 31, troubles caused by foundry sand attached to the article to be heated W with respect to the rotation drive device 33 hardly occur. That is, when the rotary drive device 33 is disposed below the furnace body 31, casting sand falls into the rotary drive device 33 and enters the interior, but such a situation does not occur when the rotary drive device 33 is disposed above the furnace body 31. Therefore, the frequency of maintenance of the rotation drive device 33 can be reduced.
Further, as in the case where the rotary drive device 33 is disposed below the furnace body 31, it is not necessary to dive under heavy objects such as the furnace body 31 and the storage rotor 32 during maintenance of the rotary drive device 33. Maintenance work can be performed safely.
Further, the structure in which the rotation drive device 33 is disposed above the furnace body 31 is simpler than the structure in which the rotation drive device 33 is disposed below the furnace body 31.

(Second embodiment)
Next, a rotary heat treatment furnace 30 according to the second embodiment of the present invention will be described with reference to FIGS. 4 and 5. In addition, the same code | symbol was attached | subjected to the same part as 1st embodiment.
In the present embodiment, the rectifying plate 38 for guiding the hot air from the first flow path 35 to the hot air intake port 36 a is provided on the inner wall of the furnace body 31.

This rectifying plate 38 is provided in front of each hot air intake port 36a as shown in FIG. 4 and is inclined so as to change the direction of hot air flowing upward or downward in the annular flow path 41 into a substantially horizontal direction, and As shown in FIG. 5, the hot air flowing in the circumferential direction in the annular flow path 41 is inclined so as to be changed to the direction toward the central portion 32 b of the storage rotating body 32.
In addition, since the inner wall of the furnace main body 31 to which the rectifying plate 38 is attached does not exist in the opening 31d of the furnace main body 31, there is no rectifying plate 38 at this position. Here, although the inner wall of the furnace body 31 does not exist at the junction of the first flow path 35 and the furnace body 31, a support member (not shown) is provided on the inner wall of the furnace body 31 in the vicinity of the junction. A current plate 38 is attached via a support member.
The only difference between this embodiment and the first embodiment is the presence or absence of the rectifying plate 38, and the other components are the same as those of the first embodiment.

According to the rotary heat treatment furnace 30 configured as described above, since the rectifying plate 38 for guiding the hot air from the first flow path 35 to the hot air intake port 36a is provided on the inner wall of the furnace body 31, the hot air intake is provided. Hot air can easily enter the storage chamber 32a from the port 36a, and the temperature in the storage chamber 32a can be increased efficiently.
If a spray nozzle is provided at this time, the flow of hot air can be further controlled.

(Third embodiment)
Next, a rotary heat treatment furnace 30 according to a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol was attached | subjected to the same part as 1st embodiment.
The difference of this embodiment from the first embodiment is a hot air intake port 36a, and the other components are the same as those of the first embodiment.

In the present embodiment, the size of the hot air intake port 36a is made different in order to make the opening amount of the hot air intake port 36a different between upstream and downstream of the rotation by the rotation drive device 33.
In other words, the number of hot air intake ports 36a corresponding to each storage chamber 32a is set to one, and the size of the hot air intake ports 36a is increased on the upstream side, while the hot air intake ports 36a on the downstream side. The size of was reduced.
Even with such a configuration, temperature control for each zone is possible with one fan 34 and one burner 39.

In the first to third embodiments, the opening amount of the hot air intake port 36a is increased on the upstream side of the rotation, and the opening amount of the hot air intake port 36a is decreased on the downstream side of the rotation. In the case where it is preferable to gradually raise the temperature of the article to be heated W, it is possible to reduce the opening amount of the hot air intake port 36a on the upstream side of the rotation. Of course, the number and size of the hot air intake ports 36a when the opening amount is increased and when the opening amount is decreased can be appropriately selected.
Further, the opening amount of the hot air intake port 36a may be the same on both the upstream side and the downstream side of the rotation by the rotation driving device 33.

  Moreover, although the rotational drive apparatus 33 was arrange | positioned above the furnace main body 31, you may arrange | position below the furnace main body 31 like the past.

  Further, the position of the rectifying plate 38 is not limited to that in the second embodiment, and the rectifying plate 38 can be appropriately disposed.

Furthermore, in the first to third embodiments, the storage rotator 32 is repeatedly stopped and rotated, but it may continue to rotate slowly at the same rotational speed.
Moreover, the 1st flow path 35 and the 2nd flow path 37 are connected, and the fan 34 may be incorporated in it.

  Moreover, although the number of the storage chambers 32a in the same horizontal plane is eight, it is not limited to this number. When the number is N, the rotation driving device 33 rotates the storage rotator 32 by 1 / N rotation.

DESCRIPTION OF SYMBOLS 10 Rotary heat treatment furnace 11 Furnace main body 12 Containment rotor 12a Containment chamber 12b Center part 20 Rotary heat treatment furnace 22a Containment chamber 24 Fan 30 Rotary heat treatment furnace 31 Furnace main body 31a Wall surface 31b Ceiling 31c Furnace 31d Opening 31e Furnace door 32 Storage rotator 32a Storage chamber 32b Central part 32c Central wall 32d Partition wall 33 Rotation drive device 34 Fan 35 First flow path 36 Cylindrical wall 36a Hot air intake port 36b Carry-in / out port 37 Second flow path 38 Rectifier plate 39 Burner 41 Annular flow path C Chamber W Object to be heated

Claims (4)

A substantially cylindrical furnace body;
A storage rotor that is supported in a rotatable manner inside the furnace body, and has a storage chamber for storing an object to be heated, which is arranged in a plurality of radial and multistage shapes and has a gap formed in the center thereof.
A rotation driving device for rotating the storage rotating body;
A fan for sending hot air to the furnace body side;
A first flow path communicating between the fan and the furnace body;
A cylindrical cylindrical wall provided on the outer side of the storage rotating body and spaced apart from the inner wall of the furnace body, and formed with a plurality of hot air intakes penetrating;
A second flow path communicating between the lower end of the central portion of the storage rotating body and the fan;
While sending hot air from the fan into the furnace body through the first flow path,
Sending the hot air to the center from the outside of the storage rotating body through the hot air intake port,
Further, the hot air is circulated so that the hot air is returned from the central portion of the storage rotating body to the fan via the second flow path.   2. The rotary heat treatment furnace according to claim 1, wherein the amount of opening of the hot air intake port is different between upstream and downstream of rotation by the rotation driving device.   The rotary heat treatment furnace according to claim 1 or 2, wherein a rectifying plate for guiding hot air from the first flow path to the hot air intake port is provided on an inner wall of the furnace body.   The rotary heat treatment furnace according to any one of claims 1 to 3, wherein the rotary drive device is disposed above the furnace body.