JP6924169B2 - Rotary heat treatment furnace - Google Patents

Description

The present invention relates to a rotary heat treatment furnace provided with a heating chamber and a soaking chamber, which circulates hot air to heat a work (object to be heated) such as an aluminum alloy.

Conventionally, for example, in order to heat-treat a work such as an aluminum alloy, a hot air circulation type heat treatment furnace provided with a heating chamber and a soaking chamber has been used (see, for example, Patent Document 1).

The heat treatment furnace described in Patent Document 1 includes a retractable rotating body in which a plurality of workpieces are stored, a burner arranged on the side thereof, and one fan, and while rotating the stored rotating body, hot air is blown from the side by the fan. It is a configuration to supply.
Since this heat treatment furnace has a structure in which a burner and a fan are provided on the side of the retractable rotating body, the installation flat area is inevitably large, and the manufacturing cost is high.

On the other hand, a heat treatment furnace provided with a burner and one fan above the retractable rotating body is disclosed (see, for example, Patent Document 2).
In this heat treatment furnace, a burner and one fan are provided above the retractable rotating body, and a pair of curved partitions are fixed in the vertical direction to a cylindrical body provided directly below the fan, and an inlet set by both partitions. A heating zone and a soaking zone are formed by changing the speed of hot air by making the opening angle narrower than the outlet opening angle.

Since the burner and the fan are arranged above the retractable rotating body, the heat treatment furnace described in Patent Document 2 has an advantage that the installation flat area can be reduced and the size can be reduced.

International Publication No. 2015/105026 Japanese Patent No. 4378432

However, as described above, the heat treatment furnace described in Patent Document 2 has an advantage that the installation flat area can be reduced and the size can be reduced, but the inlet opening angle formed by the pair of curved partitions and the inlet opening angle Since a heating zone (heating chamber) and a heat equalizing zone (heat equalizing chamber) are formed depending on the outlet opening angle, there is a problem that it is difficult to control the temperature of both zones.
This is because since the partition is fixed, its shape (that is, the inlet opening angle and the outlet opening angle) cannot be changed, and it is difficult to freely control the amount of hot air supplied to both zones.
Further, the heat treatment furnace described in Patent Document 2 has a problem that the structure is complicated because it requires a curved partition, which makes the production difficult and the production cost increases.

Therefore, an object of the present invention is to provide a rotary heat treatment furnace having a simple structure, which can reduce the installation flat area and miniaturize, and can easily control the temperature of the heating chamber and the soaking chamber. To provide.

In order to achieve the above object, the rotary heat treatment furnace (1) of the present invention has a plurality of storage chambers (21) arranged concentrically in the circumferential direction inside a planar circular furnace wall (10). A flat donut-shaped rotary storage body (20) is provided, and the internal space of the rotary storage body (20) is divided into two by two partition walls (22) extending in the radial direction from the center thereof. A rotary heat treatment furnace divided into spaces, one of which is a heating chamber (23) and the other of which is a soaking chamber (24).
A heating circulation fan (30) is provided above the heating chamber (23).
It is characterized in that one or more heat equalizing circulation fans (30) are provided above the heat equalizing chamber (24).

Further, in the rotary heat treatment furnace (1) of the present invention, the heat equalizing chamber (24) is provided with two heat equalizing partition walls (22) extending in the radial direction from the center of the internal space of the rotating storage body (20). Two heat equalizing chambers (24) divided into spaces
It is characterized in that one heat equalizing circulation fan (30) is provided above each of the two heat equalizing chambers (24).

Further, in the rotary heat treatment furnace (1) of the present invention, the two heat equalizing chambers (24) are communicated with each other except for the heat equalizing partition wall (22) that divides the two heat equalizing chambers (24). It is characterized by that.

Further, in the rotary heat treatment furnace (1) of the present invention, hot air sent from the heating circulation fan (30) is sent from the inner peripheral surface side of the rotary accommodating body (20) to the storage chamber (21) of each stage. It is characterized in that it is configured to invade, pass outward in the circumferential direction, then rise, and return to the heating circulation fan (30).

Further, in the rotary heat treatment furnace (1) of the present invention, hot air sent from the soaking circulation fan (30) descends on the inner peripheral surface side of the rotary accommodating body (20), and the lower side thereof is the circumference. It is characterized in that it passes outward in the direction, rises on the outer peripheral surface side of the rotary accommodating body (20), and returns to the soaking heat circulation fan (30).

Further, the rotary heat treatment furnace (1) of the present invention has an entrance / exit opening (14) for moving the work (W) in and out of the storage chamber (21) on the upstream side of the heating chamber (23). The feature is that one is provided.

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

According to the rotary heat treatment furnace of the present invention, a flat donut-shaped rotary storage body in which a plurality of storage chambers concentrically arranged in the circumferential direction are provided in one or multiple stages inside a flat circular furnace wall is provided. In a rotary heat treatment furnace provided, the internal space of the rotating storage body is divided into two spaces by two partition walls extending in the radial direction from the center, one of which is a heating chamber and the other of which is a soaking chamber. Since one heating circulation fan is provided above the heating chamber and one or more soaking circulation fans are provided above the soaking chamber, the installation flat area of the rotary heat treatment furnace is reduced and the size is reduced. Can be achieved. Therefore, the manufacturing cost can be reduced.

Further, by providing one heating circulation fan above the heating chamber and one or more soaking circulation fans above the soaking chamber, the rotation speeds of the heating circulation fan and the soaking circulation fan are controlled. By doing so, the amount of hot air supplied or acted on from the heating chamber and the soaking chamber to the respective storage chambers can be freely adjusted. Therefore, the temperature of each storage chamber can be easily controlled.

Further, since a curved partition unlike the heat treatment furnace described in Patent Document 2 is not required, the structure can be simplified and the manufacturing cost can be further reduced.

Further, in the rotary heat treatment furnace of the present invention, the heat equalizing chamber is divided into two space portions by a heat equalizing partition wall extending in the radial direction from the center of the internal space of the rotating storage body, and the two are divided into two spaces. Since one heat equalizing circulation fan is provided above each of the two equalizing chambers, the amount of hot air supplied to each equalizing chamber can be adjusted by each equalizing heat circulation fan.
Thereby, the temperature of the storage chamber corresponding to each heat equalizing chamber can be easily controlled.

Further, in the rotary heat treatment furnace of the present invention, the two heat equalizing chambers are communicated with each other except for the heat equalizing partition wall that separates the two heat equalizing chambers, so that hot air is sent to the two heat equalizing chambers by one fan. Can be supplied.
Thereby, the structure of the heat treatment furnace can be further simplified.

Further, according to the rotary heat treatment furnace of the present invention, hot air sent from the heating circulation fan invades the storage chamber of each stage from the inner peripheral surface side of the rotary storage body and moves outward in the circumferential direction of the rotary storage body. Since it is configured to rise after passing and return to the heating circulation fan, the temperature of the storage chamber of each stage of the rotating storage body corresponding to the heating chamber is effectively and evenly adjusted at a temperature sufficiently high to heat the work. Can be controlled to.

Further, according to the rotary heat treatment furnace of the present invention, the hot air sent from the soaking heat circulation fan descends on the inner peripheral surface side of the rotary accommodating body, passes under the inner peripheral surface side in the circumferential direction, and is rotationally accommodated. Since the outer peripheral surface side of the body is raised and returned to the heat equalizing circulation fan, the temperature of the storage chamber of each stage of the rotary storage body corresponding to the heat equalizing chamber is suitable for equalizing the heat of the work. Can be controlled effectively and evenly.

Further, according to the rotary heat treatment furnace of the present invention, since one opening / exit opening for taking in / out the work from / to the storage chamber is provided on the upstream side of the heating chamber, the work is taken in / out through one opening. be able to.
Thereby, the structure of the rotary heat treatment furnace can be further simplified. Further, since there is only one opening, it is possible to suppress the release of hot air from the rotary heat treatment furnace, and it is possible to enhance the heating and soaking effect.

It is a vertical sectional view which shows the rotary heat treatment furnace which concerns on embodiment of this invention. It is a top view of the rotary heat treatment furnace shown in FIG. 1 (robot omitted). It is a cross-sectional view of the rotary heat treatment furnace shown in FIG. It is a cross-sectional view which shows the other aspect of this invention. It is a cross-sectional view which shows still another aspect of this invention. It is a cross-sectional view which shows still another aspect of this invention.

The rotary heat treatment furnace 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The rotary heat treatment furnace 1 according to the present embodiment heats a work (heated object) W such as an aluminum alloy by circulating hot air, and heat-treats the furnace wall 10, the rotary housing 20, the burner 40, and the heat circulation. A fan 30 and a soaking heat circulation fan 31 are provided.

The furnace wall 10 is composed of a flat circular peripheral wall portion 11, a bottom wall portion 12 integrally provided at the bottom portion of the peripheral wall portion 11, and a top wall portion 13 integrally provided at the upper end portion of the peripheral wall portion 11. It is composed.

The rotary accommodating body 20 is concentrically provided inside the furnace wall 10, and a plurality of accommodating chambers 21 for accommodating the work W are arranged in the circumferential direction, and the rotating accommodating bodies 20 are arranged in a multi-stage shape in a flat donut shape. Each storage chamber is independent of the upper and lower storage chambers and the left and right storage chambers in the circumferential direction by a partition wall 21a.
The rotary housing 20 of the present embodiment is not limited, but is set to rotate in the clockwise direction. Further, the rotary storage body 20 is intermittently rotated in order to facilitate the loading and unloading of the work W.

The rotating storage body 20 has an internal space formed by forming a flat donut shape. In this internal space, three partition walls 22 extending in the radial direction from the center thereof are provided at equal intervals in the circumferential direction to have the same volume. It forms three space parts with. One of them is a heating chamber 23, and the other two are a soaking chamber 24.

The outer peripheral side of the heating chamber 23 is open, and each storage chamber 21 is provided with a straightening vane (not shown) for guiding hot air. Further, on the outer peripheral side of the heat equalizing chamber 24, a guide wall 24a for supplying hot air below the rotary accommodating body 20 is provided.

The burner 40 is composed of a gas burner, and one is provided at a portion of the peripheral wall portion 11 facing the upper end portion of the central portion in the circumferential direction of the heating chamber 23. By doing so, high-temperature hot air can be more effectively supplied to the heating chamber 23. The type of burner 40 is not limited.

One heating circulation fan 30 is provided on the top wall portion 13 at a location facing the heating chamber 23, and is arranged so as to supply hot air from directly above the heating chamber 23 to below. This hot air entered the storage chamber 21 of each stage from the inner peripheral surface side of the rotary storage body 20 and passed outward in the circumferential direction by opening the outer peripheral side of the heating chamber 23 and providing a rectifying plate. After that, it rises and returns to the heating circulation fan 30.

Further, one heat equalizing circulation fan 31 is provided on the top wall portion 13 at a location facing one heat equalizing chamber 24, and one is provided at a location facing the other heat equalizing chamber 24 on the top wall portion 13. Each of them is arranged so as to supply hot air from directly above to below the corresponding heat equalizing chamber 24. By providing the guide wall 24a on the outer peripheral side of the heat equalizing chamber 24, this hot air descends on the inner peripheral surface side of the rotary accommodating body 20 and passes through the lower side in the circumferential direction to the outer peripheral side of the rotary accommodating body 20. It rises on the outer peripheral surface side of 20 and returns to the soaking heat circulation fan 31.

Further, in this rotary heat treatment furnace 1, one opening / exit opening 14 for the work W is provided for each of a plurality of storage chambers 21 in each stage at a position of the furnace wall 10 facing the upstream side of the heating chamber 23. It is opened and closed by the door portion 14a. One robot R is arranged on the outside of the furnace wall 10 in the vicinity of the entrance / exit opening 14, and the work W is taken in and out of the storage chamber 21 of each stage by using this one robot R.

The rotary heat treatment furnace 1 according to the present embodiment can be operated as follows.
First, the rotary storage body 20 is rotated while the work W is stored in the storage chamber 21 of each stage by the robot R.
The work W stored in the storage chamber 21 is first heat-treated by hot air supplied from the heating chamber 23. Since one heating circulation fan 30 is arranged directly above the heating chamber 23, the amount of hot air supplied from the heating chamber 23 to the storage chamber 21 is adjusted by adjusting the rotation speed thereof, and the temperature thereof is adjusted. Can be controlled. Therefore, the work W of the storage chamber 21 can be heated at a temperature suitable for heat treatment.

The outer peripheral side of the heating chamber 23 is open, and a rectifying plate is provided so that hot air enters each storage chamber 21 from the inner peripheral surface side of the rotary storage body 20 and passes outward in the circumferential direction. Therefore, the work W of each storage chamber 21 can be effectively heated.

The hot air that has passed through each storage chamber 21 then rises and returns to the heating circulation fan 30, is reheated by the heat of the burner 40, and is then supplied to the heating chamber 23 and each storage chamber 21 again.
The work W is heat-treated by repeating such circulation.

The work W heat-treated by the hot air passing through the heating chamber 23 reaches the outer peripheral side of one (first) soaking chamber 24 by the rotation of the rotating storage body 20, and is heat-treated by the hot air passing through the heat equalizing chamber 24. Will be done. Since the heat equalizing circulation fan 31 is provided directly above the heat equalizing chamber 24, the temperature of the hot air acting on each storage chamber 21 can be freely controlled by adjusting the rotation speed thereof. As a result, the work W can be effectively treated at a temperature suitable for soaking.

The hot air descends on the inner peripheral surface side of the rotary accommodating body 20 by the guide wall 24a provided on the outer peripheral side of the heat equalizing chamber 24, passes the lower side thereof outward in the circumferential direction, and is a rotary accommodating body. Ascend on the outer peripheral surface side of 20. In this way, since the hot air is set so as not to enter each storage body, the work W of each storage body can be subjected to a more suitable soaking heat treatment.

The hot air rising on the outer peripheral surface side of the rotary accommodating body 20 returns to the heat equalizing circulation fan 31, is reheated by the heat of the burner 40, and is then supplied to the heat equalizing chamber 24 again. By repeating such circulation, the work W is continuously heat-treated.

The work W that has been heat-treated by the hot air that has passed through the one (first) heat equalizing chamber 24 reaches the outer peripheral side of the other (next) heat equalizing chamber 24 by the rotation of the rotary storage body 20, and the heat equalizing chamber 24 It is soothed by hot air passing through.
Since the heat equalizing circulation fan 31 is also provided directly above the heat equalizing chamber 24, the temperature of the hot air acting on each storage chamber 21 can be freely adjusted by adjusting the rotation speed thereof. As a result, the work W can be effectively heat-treated at a temperature corresponding to the work W.

Further, since the heat equalizing circulation fan 31 is provided in each of the one heat equalizing chamber 24 and the other heat equalizing chamber 24, one of the heat equalizing chambers 24 can be changed by changing the rotation speed of each heat equalizing circulation fan 31. It is also possible to change the temperature of the storage chamber 21 heated by the hot air of the above and the temperature of the storage chamber 21 heated by the hot air of the other soaking chamber 24.
Thereby, if necessary, the work W can be subjected to a two-step leveling heat treatment at different temperatures.

The work W of the storage chamber 21 that has been subjected to the leveling heat treatment reaches the vicinity of the entrance / exit opening 14 formed in the peripheral wall by the rotation of the rotary storage body 20. Therefore, the entrance / exit opening 14 is opened by opening the door portion 14a, and the work W is taken out through the entrance / exit opening 14 by the robot R and conveyed to the next step. A new work W is put into the storage chamber 21 from which the work W has been taken out by the same robot R, and the above-mentioned heat treatment and bacterial heat treatment are performed. In this way, a large number of work Ws can be continuously heat-treated.

Since each storage chamber 21 is independent of the storage chambers 21 on the top, bottom, left and right in the circumferential direction by the partition wall 21a, when the entrance / exit opening 14 is opened, the hot air from the other storage chambers 21 is exposed to the outside. Can be prevented from escaping to. Therefore, it is possible to prevent the temperature loss in the rotary heat treatment furnace 1.

In the above embodiment, the two heat equalizing chambers 24 are partitioned by the partition wall 22, but the present invention is not limited to this, and as shown in FIG. 4, between the two heat equalizing chambers 24. The two heat equalizing chambers 24 can be communicated with each other except for the partition wall 22 (omitted).
In that case, the number of heat equalizing circulation fans 31 provided directly above the fan 31 may be two, or one as shown in FIG.

Further, in the rotary heat treatment furnace 1 of the above embodiment, one heating chamber 23 and two heat equalizing chambers 24 are formed by three partition walls 22, but the present invention is not limited to this, and FIG. As shown, one heating chamber 23 and one soaking chamber 24 can be formed as the two partition walls 22.
In this case, the heating circulation fan 30 and the soaking circulation fan 31 are not limited to one, but one can be provided for each.

1 Rotary heat treatment furnace 10 Furnace wall 11 Peripheral wall 12 Bottom wall 13 Top wall 14 Entrance / exit opening 14a Door 20 Rotating storage 21 Storage room 21a Partition 22 Partition wall 23 Heating room 24 Heat equalizing room 24a Guide wall 30 Heating Circulation fan 31 Uniform heat circulation fan 40 Burner R Robot W work

Claims (6)

Inside the flat circular furnace wall, a flat donut-shaped rotary storage body in which a plurality of storage chambers arranged in the circumferential direction are concentrically arranged in one or multiple stages is provided, and the internal space of the rotary storage body is created. A rotary heat treatment furnace that is divided into two spaces by two partition walls extending in the radial direction from the center, one of which is a heating chamber and the other of which is a soaking chamber.
A heating circulation fan is provided above the heating chamber.
A rotary heat treatment furnace characterized in that one or more heat equalizing circulation fans are provided above the heat equalizing chamber. The heat equalizing chamber is divided into two space portions by a heat equalizing partition wall extending in the radial direction from the center of the internal space of the rotating storage body.
The rotary heat treatment furnace according to claim 1, wherein one heat equalizing circulation fan is provided above each of the two heat equalizing chambers. The rotary heat treatment furnace according to claim 2, wherein the two heat equalizing chambers are communicated with each other except for the heat equalizing partition wall that divides the two heat equalizing chambers. The hot air sent from the heating circulation fan enters the storage chamber of each stage from the inner peripheral surface side of the rotating storage body, passes outward in the circumferential direction, and then rises and returns to the heating circulation fan. The rotary heat treatment furnace according to any one of claims 1 to 3, wherein the rotary heat treatment furnace is configured in the above. The hot air sent from the soaking heat circulation fan descends on the inner peripheral surface side of the rotary accommodating body, passes the lower side thereof outward in the circumferential direction, and rises on the outer peripheral surface side of the rotary accommodating body. The rotary heat treatment furnace according to any one of claims 1 to 4, wherein the rotary heat treatment furnace is configured to return to the soaking circulation fan. The rotary heat treatment according to any one of claims 1 to 5, wherein one entrance / exit opening for taking in / out a work from the storage chamber is provided on the upstream side of the heating chamber. Furnace.

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