JP4054597B2 - Hot air circulation oven - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot air circulation oven that performs heat treatment on an object to be processed such as a plate-like body.
[0002]
[Prior art and problems to be solved by the invention]
For example, a hot air circulation oven that circulates hot air heated to a predetermined temperature by a heater in a sealed heating chamber is used in a heat treatment furnace that performs batch heat treatment in a low and medium temperature range up to 700 ° C. ing.
However, in an oven as described above, conventionally, after the heat treatment is completed, outside air is introduced into the heating chamber, the internal temperature is lowered to about 100 ° C., and then the door is opened and cooled to a temperature at which it can be taken out. The processing object was taken out from the room. For this reason, there has been a problem that the cooling time for cooling the heating chamber becomes longer and the batch processing time for the object to be processed becomes longer. In order to shorten the cooling time in the heating chamber, it has also been proposed to open the heating chamber immediately after the heat treatment and cool it with the outside air, but when the chamber is opened in this way, the stainless steel plate disposed in the chamber The interior metal plate such as the metal plate is rapidly cooled, and the metal plate contracts greatly as compared with the exterior metal plate of the heating chamber, and there is a possibility that the life of the heating chamber is impaired due to distortion.
[0003]
In addition, when batch processing is performed on the workpieces, the workpiece to be heat-treated next can be introduced into the heating chamber until the cooling in the heating chamber is finished and the workpiece after the heat treatment is taken out. In addition, in order to heat the next object to be processed, it is necessary to increase the internal temperature of the heating chamber to a predetermined processing temperature again, so that it takes time to increase the temperature and the batch processing time becomes longer. was there.
[0004]
In view of the above-described conventional problems, the present invention provides hot air that can shorten the batch processing time of the processing object without impairing the life of the heating chamber even when the processing object is batch processed continuously. An object is to provide a circulating oven.
[0005]
[Means for Solving the Problems]
The present invention is an oven in which heat treatment is performed batchwise in a low and medium temperature range up to 700 ° C.,
A heating chamber in which a furnace port is formed in the floor, and heat treatment is performed on the workpiece by hot air circulated inside;
A load chamber provided below the heating chamber and communicating with the heating chamber via the furnace port;
The load chamber is provided so as to be movable up and down, and the mounted workpiece is introduced into the heating chamber at the raised position, and a hearth member that closes the furnace port, and a lift that raises and lowers the hearth member in the load chamber. Mechanism,
Rutotomoni provided continuously to the load chamber, in a position to bypass the path for carrying an object to be processed before the heat treatment from the outside to the load chamber has a cooling section for cooling the object to be processed after the heat treatment, the heat treatment Previous and turned-ejecting chamber that extraction is carried out to the outside of the workpiece after the on and heat treatment and cooling to the load chamber of the object to be processed,
A transport mechanism for carrying in the workpiece before heat treatment from the loading / unloading chamber to the load chamber, and carrying out the workpiece after heat treatment and before cooling from the loading chamber to the loading / unloading chamber;
A hot-air circulation oven, characterized in that an object to be processed from one are Ete Bei a transfer mechanism for transferring to the other between the hearth member and the transport mechanism (claim 1).
[0006]
In the hot-air circulating oven configured as described above, the object to be processed after the heat treatment can be cooled by the cooling unit provided in the input / output chamber connected to the heating chamber through the load chamber. Therefore, unlike the conventional example, it is not necessary to cool the heating chamber for each treatment. Further, while the workpiece after heat treatment is cooled in this cooling unit, the next workpiece is transferred into the load chamber by the transfer mechanism and transferred from the transfer mechanism to the hearth member via the transfer mechanism. Thereafter, by raising the hearth member by the lifting mechanism, the next object to be processed can be introduced into the heating chamber, and the object to be processed can be heat-treated. Furthermore, by raising the hearth member by the lifting mechanism, the furnace port can be closed and the heating chamber after the heat treatment can be sealed.
[0007]
Furthermore, Oite to the hot-air circulating oven emissions, the cooling unit, so is provided in a position to bypass the carry-in path of the workpiece prior to heat treatment in the closing-ejecting chamber, against the object to be treated before the heat treatment It can prevent reliably that the carrying-in operation | movement by the said conveyance mechanism is prevented by the to-be-processed object after the heat processing cooled by the said cooling part.
[0008]
Further, in the hot air circulation oven (Claim 1) , the transport mechanism has a mounting member for mounting an object to be processed, and is mounted on the mounting member between the load chamber and the loading / unloading chamber. A moving carriage for moving the mounted processing target is provided,
The transfer mechanism includes a transfer member provided on the hearth member so as to form the same plane as the mounting member when the workpiece is transferred between the hearth member and the movable carriage. The transfer member is configured to transfer the workpiece from the mounting member side to the hearth member side by the raising operation of the hearth member by the lifting mechanism, and to the hearth by the lowering operation of the hearth member by the lifting mechanism. it is preferable to transfer the object to be processed mounting member side from the member side (claim 2).
In this case, since the transfer member can transfer the workpiece between the hearth member and the mounting member by the raising / lowering operation of the hearth member by the lifting mechanism, the structure of the transfer mechanism is simplified. be able to.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the hot-air circulating oven of the present invention will be described with reference to the drawings.
1, 2, and 3 are respectively a cross-sectional view as viewed from the right side, a cross-sectional view as viewed from the front side, and a plan view as viewed from the upper side (including a partial cross-section) of the hot-air circulating oven according to one embodiment of the present invention. ). 1 to 3, the oven 1 according to the present embodiment is heated via a heating chamber 3 covered with a heat insulating material 2, a load chamber 4 provided below the heating chamber 3, and the load chamber 4. The chamber 3 is provided with a loading / unloading chamber 5 in which the workpiece W before the heat treatment is loaded into the load chamber 4 and the workpiece W after the heat treatment is unloaded. The oven 1 is configured to perform batch processing by placing the workpiece W on the rack member 6 and moving the heating chamber 3, the load chamber 4, and the loading / unloading chamber 5. (Details will be described later).
[0010]
Above the heating chamber 3, a heater 7 and a sirocco fan 8 are provided. The sirocco fan 8 circulates hot air heated to a predetermined temperature by the heater 7 in the room as indicated by an arrow X in FIG. .
In addition, a furnace port P is formed on the floor of the heating chamber 3 so that the workpiece W installed on the rack member 6 can be loaded and unloaded from the inside of the load chamber 4. 3, the object W in the room is heat-treated with the hot air in a state where the hearth member 10 moved up and down in the load chamber 4 by the elevating mechanism 9 airtightly closes the furnace port P.
[0011]
As shown in FIG. 1, the elevating mechanism 9 includes a motor (not shown) disposed in a machine chamber 11 provided on the side of the load chamber 4, a chain 9a driven by the motor (not shown), and the chain 9a. Thus, the lifting / lowering fork 9b moved in the vertical direction in the load chamber 4 is driven, and the lifting / lowering fork 9b is driven in accordance with an instruction signal from the control unit 12.
The hearth member 10 is provided in the load chamber 4 so as to be movable up and down, and is configured to introduce the workpiece W to be loaded into the heating chamber 3 at the raised position and close the furnace port P. Specifically, the hearth member 10 is in contact with an upper portion 10 a disposed in the furnace port P when the member 10 closes the furnace port P, and a partition plate that partitions the heating chamber 3 and the load chamber 4. The lower portion 10b for sealing the furnace port P is fixed to the elevating fork 9b. The upper portion 10a is provided with transfer members 13a and 13b, which will be described later, and the hearth member 10 supports the rack member 6 and the workpiece W via the transfer members 13a and 13b.
[0012]
Inside the load chamber 4, a moving mechanism 15 for moving the movable carriage 14 carrying the rack member 6 and the workpiece W between the loading / unloading chamber 5 is disposed. The moving mechanism 15 includes an electric motor (not shown) that rotates in accordance with an instruction signal from the control unit 12, and the moving mechanism 15 is connected via a chain member 15a by the rotation of the electric motor. The movable carriage 14 is moved between the stop positions set in the load chamber 4 and the loading / unloading chamber 5 as indicated by a solid line and a two-dot chain line in FIG.
The movable carriage 14 and the moving mechanism 15, transports the workpiece W before the heat treatment from the feeding-ejecting chamber 5 is transferred into the load chamber 4, the workpiece W after the heat treatment turned-ejecting chamber 5 from the load chamber 4 The transport mechanism is configured.
[0013]
The movable carriage 14 has a pair of mounting members 14a and 14b that contact the rack member 6 and mounts the workpiece W, and rail members (see FIG. 5) provided on the floors of the load chamber 4 and the loading / unloading chamber 5. And four wheels 14c guided by (not shown).
In addition, when the carriage 14 is stopped at the stop position in the load chamber 4 as shown in FIG. 1, the moving carriage 14 has a mounting member 14 a, 14 b between the pair of transfer members 13 a, 13 b. It is supposed to be inserted through. These transfer members 13a and 13b constitute a transfer mechanism for transferring the workpiece W from one side to the other between the hearth member 10 and the mounting members 14a and 14b. The hearth member 10 is provided so as to protrude upward from the portion 10a. The transfer members 13a and 13b form the same plane as the mounting members 14a and 14b when the rack member 6 and the workpiece W are transferred between the hearth member 10 and the mounting members 14a and 14b. The rack member 6 and the workpiece W on the mounting members 14a and 14b are transferred to the hearth member 10 side by the raising operation of the hearth member 10 by the lifting mechanism 9, and the hearth member 10 is lowered by the lifting mechanism 9 By operation, the rack member 6 and the workpiece W on the hearth member 10 are transferred to the mounting members 14a and 14b.
[0014]
As shown in FIG. 3, in the charging / unloading chamber 5, there are a first support 16 a for constituting a charging unit into which the workpiece W before heat treatment is charged and a workpiece W after cooling. A second support base 16b for constituting the take-out part to be taken out and a third support base 16c for constituting a cooling part for cooling the workpiece W after the heat treatment are provided. The rack member 6 and the workpiece W can be arranged on 16a to 16c. Further, the second and third support tables 16b and 16c are arranged at positions in the loading / unloading chamber 5 so as to bypass the loading path of the workpiece W to be processed before being heat transferred to the load chamber 4. Furthermore, the third support 16c cools the workpiece W on the support 16c by the outside air flowing between the openings provided in the left-right direction in FIG. A conveyor (not shown) for moving the workpiece W before and after the heat treatment is disposed on the left opening side of the loading / unloading chamber 5, and a loading / unloading mechanism (not shown) is provided from the control unit 13. In accordance with the instruction signal, the rack member 6 and the workpiece W are carried in or out between the loading / unloading chamber 5 and the conveyor. In the loading / unloading chamber 5, the rack member 6 and the workpiece W are appropriately moved on the movable carriage 14 and the first to third support bases 16 a to 16 c by the carry-in / out mechanism. . In addition to the above description, forcible cooling means such as a blower may be provided in the vicinity of the third support base 16c to shorten the cooling time of the workpiece W on the support base 16c.
[0015]
In the oven 1 of the present embodiment configured as described above, the workpiece W before the heat treatment is installed on the rack member 6 in the input / exit chamber 5 from the outside as indicated by an arrow A in FIG. In this state, it is loaded by the carry-in / out mechanism and placed on the first support 16a. Thereafter, when the workpiece W is moved as indicated by arrow B by the loading / unloading mechanism and placed on the mounting members 14a and 14b of the moving carriage 14, the control unit 12 is moved by the moving mechanism 15 as indicated by arrow C. The movable carriage 14 carrying the workpiece W before heat treatment is moved from the loading / unloading chamber 5 to a stop position in the load chamber 4. And the control part 12 operates the raising / lowering mechanism 9 and raises the hearth member 10 slightly from the state shown in FIG. 1, thereby moving the workpiece W on the mounting members 14a, 14b to the transfer members 13a, It is transferred onto 13 b and transferred onto the hearth member 10. Subsequently, the control unit 12 moves the movable carriage 15 into the loading / unloading chamber 5 and then raises the hearth member 10 by the elevating mechanism 9 to heat the workpiece W as indicated by an arrow D in FIG. It arrange | positions inside the chamber 3 and heat-processes the to-be-processed object W. FIG.
[0016]
Then, the heat treatment of the workpiece W is completed, the control unit 12 as shown by the arrow E in FIG. 2, lowers the hearth member 10 by the elevating mechanism 9, the workpiece W before after heat treatment and cooling Move into the load chamber 4. The control unit 12 moves the moving carriage 14 from the loading / unloading chamber 5 to the stop position in the load chamber 4 by the moving mechanism 15 and then operates the lifting mechanism 9 to show the hearth member 10 in FIG. The workpiece W on the transfer members 13a and 13b is transferred onto the mounting members 14a and 14b by being slightly lowered from the above state.
Subsequently, the control unit 12 moves the movable carriage 14 into the loading / unloading chamber 5 as shown by an arrow F in FIG. 3, and then raises the hearth member 10 by the elevating mechanism 9 to make the furnace port P airtight. Obstructed. Further, the workpiece W after heat treatment and before cooling is moved from the movable carriage 14 onto the third support base 16c by the carry-in / out mechanism as shown by the arrow G in FIG. It is cooled for a predetermined time on 16c. Thereafter, as shown by an arrow H in FIG. 3, the workpiece W is moved from the third support 16 c onto the second support 16 b by the loading / unloading mechanism, and then the arrow W in the same figure. As shown in the figure, it is carried out of the loading / unloading chamber 5 by the loading / unloading mechanism.
In addition, while the control unit 12 is cooling the workpiece W after the heat treatment on the third support 16c, the control unit 12 puts the next workpiece W into the loading / unloading chamber 5 to perform the above operation. Are sequentially performed to subject the workpiece W to heat treatment.
[0017]
As described above, in the hot-air circulating oven 1 of the present embodiment, the load chamber 4 is provided below the heating chamber 3, and the charging / discharging chamber 5 configured separately from the loading chamber 4 is further provided. The to-be-processed object W after heat processing is cooled with the 3rd support stand (cooling part) 16c arrange | positioned in the chamber 5. FIG. Thus, unlike the conventional example, it is not necessary to cool the inside of the heating chamber 3 for each process, and the life of the heating chamber 3 due to this cooling can be prevented from being reduced. In addition, since the next workpiece W can be heat-treated while the workpiece W after the heat treatment is cooled on the cooling unit, even when the workpieces W are batch-processed continuously. Compared with the conventional example, the processing interval of the workpiece W can be made much shorter, and the processing speed can be easily increased. Furthermore, since the control part 12 moves the to-be-processed object W after heat processing to the said cooling part, and raises the hearth member 10 with the raising / lowering mechanism 9, and has closed the furnace port P airtightly, The inside of the heating chamber 3 can be sealed, and the temperature in the heating chamber 3 after the heat-treated object W is taken out in combination with the cooling of the object W after the heat treatment in the cooling section. Reduction can be suppressed as much as possible. As a result, the internal temperature of the heating chamber 3 can be maintained at a predetermined temperature, and particularly when batch processing the workpieces W, the processing speed is reduced while minimizing the loss of thermal energy. The batch processing time of the workpieces W can be shortened.
[0018]
Further, in the present embodiment, the cooling unit (third support 16c) is provided in a position that bypasses the carry-in path of the workpiece W before the heat treatment in the loading / unloading chamber 5. As a result, when the moving carriage 14 and the moving mechanism 15 (conveying mechanism) carry the workpiece W before the heat treatment from the loading / unloading chamber 5 to the load chamber 4, the post-heat treatment cooled on the cooling section is performed. It is possible to surely prevent the workpiece W from being obstructed, and to easily automate the cooling treatment of the workpiece W and the heat treatment of another workpiece W without providing a plurality of the transport mechanisms. Can do.
Moreover, in this embodiment, the said transfer members 13a and 13b transfer the to-be-processed object W between the said member 10 and mounting member 14a, 14b by the raising / lowering operation | movement of the hearth member 10 by the raising / lowering mechanism 9. FIG. . Therefore, the workpiece W can be transferred between the hearth member 10 and the movable carriage 14 without providing a transfer robot or the like.
[0019]
In the above description, the first to third support bases 16a to 16c are arranged in the input / extraction chamber 5 and the input unit, the extraction unit, and the cooling unit are provided in the chamber. The invention is not limited as long as the workpiece W after the heat treatment can be cooled by the cooling section. For example, the plurality of movements that can operate independently in the load chamber 4 and the loading / unloading chamber 5 are possible. A cart may be provided, and the support tables 16a to 16c may be omitted .
[0020]
【The invention's effect】
The present invention configured as described above has the following effects.
According to the hot air circulation type oven of claim 1, since it is not necessary to cool the heating chamber for each treatment, the life of the heating chamber is not impaired by cooling unlike the conventional example, and the length of the oven is reduced. Life can be extended. Also, unlike the above-described conventional example, while the processing object after the heat treatment is cooled in the cooling unit, the next processing object can be heat-treated in the heating chamber, so that the processing object is continuously batched. Even in the case of processing, the processing speed can be easily increased as compared with the conventional example, and the processing capacity of the oven can be improved. Moreover, since the furnace port can be closed by the hearth member and the heating chamber after the heat treatment can be sealed, coupled with the fact that the object to be treated after the heat treatment is cooled by the cooling unit, The temperature drop in the heating chamber after taking out can be suppressed as much as possible. As a result, the internal temperature of the heating chamber can be maintained at a predetermined temperature, and the batch processing time of the object to be processed can be shortened by preventing a decrease in the processing speed even when the object to be processed is batch processed continuously. it can.
[0021]
Furthermore, in the hot-air circulating oven, the cooling unit is provided at a position that bypasses the carry-in path of the object to be processed before the heat treatment in the loading / unloading chamber. Since it is possible to reliably prevent the operation from being hindered by the object to be processed after the heat treatment being cooled in the cooling section, automation of the cooling process for the object to be processed after the heat treatment and the heat treatment for the next object to be processed is performed. It can be performed with a simple configuration, and even when an object to be processed is continuously processed, the processing speed of the oven can be improved by increasing the processing speed.
[0022]
According to the hot air circulation oven of claim 2, the transfer member transfers the workpiece between the hearth member and the mounting member by the raising / lowering operation of the hearth member by the lifting mechanism. It is possible to easily transfer the object to be processed between the hearth member and the movable carriage without providing the above, and the configuration of the oven can be simplified.
[Brief description of the drawings]
FIG. 1 is a right side view (including a partial cross-section) of a hot-air circulating oven according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view seen from the front side of the hot air circulation oven.
FIG. 3 is a plan view (including a partial cross section) seen from above the hot air circulation oven.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot-air circulation type oven 3 Heating chamber 4 Load chamber 5 Loading / unloading chamber 9 Lifting mechanism 10 Hearth members 13a and 13b Transfer member (transfer mechanism)
14 Moving cart (conveyance mechanism)
14a, 14b Mounting member 15 Movement mechanism (conveyance mechanism)
16c 3rd support stand (cooling part)
P furnace opening

Claims (2)

An oven in which heat treatment is performed batchwise in a low-medium temperature range up to 700 ° C,
A heating chamber in which a furnace port is formed in the floor, and heat treatment is performed on the workpiece by hot air circulated inside;
A load chamber provided below the heating chamber and communicating with the heating chamber via the furnace port;
A hearth member that is provided in the load chamber so as to be movable up and down, introduces the workpiece to be loaded into the heating chamber at the elevated position, and closes the furnace port;
An elevating mechanism for elevating and lowering the hearth member in the load chamber;
Rutotomoni provided continuously to the load chamber, in a position to bypass the path for carrying an object to be processed before the heat treatment from the outside to the load chamber has a cooling section for cooling the object to be processed after the heat treatment, the heat treatment Previous and turned-ejecting chamber that extraction is carried out to the outside of the workpiece after the on and heat treatment and cooling to the load chamber of the object to be processed,
A transport mechanism for carrying in the workpiece before heat treatment from the loading / unloading chamber to the load chamber, and carrying out the workpiece after heat treatment and before cooling from the loading chamber to the loading / unloading chamber;
A hot air circulation oven, characterized in that there Bei Ete a processing object from one and the transfer mechanism for transferring to the other between the hearth member and the transport mechanism. The transport mechanism has a mounting member for mounting an object to be processed, and is provided with a moving carriage that moves a processing part mounted on the mounting member between the load chamber and the loading / unloading chamber,
The transfer mechanism includes a transfer member provided on the hearth member so as to form the same plane as the mounting member when the workpiece is transferred between the hearth member and the movable carriage. The transfer member is configured to transfer the workpiece from the mounting member side to the hearth member side by the raising operation of the hearth member by the lifting mechanism, and to the hearth by the lowering operation of the hearth member by the lifting mechanism. The hot air circulation oven according to claim 1, wherein the object to be processed is transferred from the member side to the mounting member side.

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