JP6749738B2 - Heat treatment furnace - Google Patents

Description

The present invention is provided with a door for opening and closing an opening provided on the side wall of the furnace, and opening and closing the door to introduce the object to be treated into the furnace through the opening, and to supply hot air heated by a heating device. The present invention relates to a heat treatment furnace for heating an object to be processed by spraying the object to be processed from above to below. In particular, as the hot air heated by the heating device as described above is blown downward from above the object to be treated introduced into the furnace, the object to be treated is heated from above to below. When the hot air blown toward the furnace is circulated inside the furnace and the door is opened and closed to introduce the object to be processed into the furnace through the opening, outside cold air is passed through the opening where the door is opened. It is characterized in that the temperature inside the furnace is prevented from lowering by suppressing the flow of the hot air inside the furnace and the blowing out of the hot air inside the furnace to the outside.

BACKGROUND ART Conventionally, when heating an object to be processed in a heat treatment furnace, a door for opening and closing an opening provided in a side wall of the furnace is provided, and the door is opened and closed to bring the object to be processed into the inside of the furnace. There is used one that is introduced and blows hot air heated by a heating device downward from above the object to be processed to heat the object to be processed.

Here, in such a heat treatment furnace, when the door is opened and closed to introduce the object to be processed into the furnace through the opening, the cool air outside the furnace is passed through the opening where the door is opened. There is a problem that the temperature inside the furnace is lowered by flowing into the inside of the furnace or blowing hot air inside the furnace to the outside.

Therefore, in Patent Document 1, an air curtain device is provided on the outside of the door, and the air curtain device is operated to form an air curtain outside the opening only when the door is opened. However, it has been proposed that this air curtain prevents external cold air from flowing into the furnace and hot air inside the furnace from blowing out through the opening of the door. There is.

Further, in Patent Document 2, an air curtain mechanism that blows air from the lower portion of the door is provided, air is blown from the lower portion of the door to form an air curtain at the opening, and the door is opened. It has been proposed that the outside cold air be prevented from flowing into the furnace and the hot air inside the furnace from being blown outside.

However, in any of the above-mentioned Patent Documents 1 and 2, as the air curtain, the outside air whose temperature is lower than that of the inside of the furnace is used, and the door is opened to pass the object to be processed through the opening. When introducing into the furnace or taking out heated objects from the inside of the furnace, the outside air with low temperature used for the air curtain flowed into the inside of the furnace, and the outside air with low temperature was heated. There is a problem that only the upper surface of the object to be processed is cooled when the object is processed, and the processing on the object becomes uneven.

In addition, when the low-temperature outside air flows into the furnace as described above, rotating the blower fan that circulates the hot air inside the furnace causes the low-temperature outside air that has flowed into the furnace When the door is opened, the rotation of the blower fan was also stopped because the temperature inside the furnace decreased, but there was also the problem that it took time to stop and restart it. ..

JP-A-5-5124 JP, 2007-187398, A

The present invention is provided with a door for opening and closing an opening provided on the side wall of the furnace, and opening and closing the door to introduce the object to be treated into the furnace through the opening, and to supply hot air heated by a heating device. It is an object of the present invention to solve the above-mentioned problems in a heat treatment furnace in which an object to be processed introduced into the furnace is blown downward to heat the object to be processed.

That is, in the present invention, the hot air heated by the heating device is blown downward from above the object to be treated introduced into the furnace to heat the object to be treated. The hot air blown toward the inside is circulated inside the furnace, and when the door is opened and closed to introduce the object to be processed into the inside of the furnace, the outside cool air flows through the opening where the door is opened. An object of the present invention is to prevent the temperature inside the furnace from decreasing by suppressing the flow of hot air inside the furnace and the blowing out of the hot air inside the furnace to the outside.

In the heat treatment furnace according to the present invention, in order to solve the above problems, a door for opening and closing the opening provided in the side wall of the furnace is provided, and the object to be treated is opened and closed by opening and closing the door. In a heat treatment furnace in which a hot air heated by a heating device is introduced into the furnace and is blown downward from above the object to be processed, the hot air is circulated inside the furnace in a heat treatment furnace. Together with the slit-shaped shielding hot air outlet for blowing the hot air downward from above along the opening , in circulating the hot air inside the furnace, the object to be treated inside the furnace A pair of guide regulation plates along the introduction direction of the workpiece are installed so as to be arranged on both sides of the workpiece to be introduced, and hot air is guided between the pair of guide regulation plates from above to below the workpiece and the hot air led beneath the object was so that provided the circulation guide member for guiding the outside of the guide regulating plate of the provided on both sides of the workpiece.

Then, in the heat treatment furnace according to the present invention, from the slit-shaped shielding hot air outlet as described above, when hot air is blown downward from above along the opening, the door is opened as described above. When the workpiece is opened and introduced into the furnace through the opening or when it is pulled out from the inside of the furnace, it is blown downward from above along the opening from the slit-shaped shielding hot air outlet. Due to the hot air that is generated, an air curtain is formed by the hot air in the opening, so it is more likely that the outside air will flow through the opening that opens the door than the conventional air curtain that uses cold air (normal temperature air) outside the furnace. Cold air is prevented from flowing into the furnace, and hot air circulated inside the furnace is prevented from blowing outside.

Further, in the heat treatment furnace, it is preferable to provide a slit-shaped opposite side hot air outlet for blowing the hot air downward from above along the inner surface of the side wall on the side opposite to the opening. Thus, the slit-shaped opposite hot air outlet is provided, and when hot air is blown downward from above along the inner surface of the side wall on the side opposite to the opening, the hot air is opened by this hot air outlet. The side wall on the side opposite to the section is heated, and the temperature of the inner surface of the side wall on the side opposite to the opening becomes low due to the external cold air conducting heat to the outer wall, and the temperature inside the furnace decreases or becomes uneven. Is prevented. Note that the "slit-shaped" blow-out port here includes a blow-out port having holes arranged in a row.

Further, in the heat treatment furnace, when circulating the hot air heated by the heating device inside the furnace, the hot air heated by the heating device above the object to be treated introduced into the furnace by the blower fan. It is possible to spray downward from to heat the object to be processed, and to guide the hot air after heating the object to be heated to the heating device to circulate it.

In the heat treatment furnace of the present invention, the hit to the circulating hot air inside the furnace as, the process is introduced to a pair of guide regulating plate along the direction of introduction of the workpiece in the interior of the furnace The hot air was introduced from above the object to be processed through the pair of guide regulation plates, and the hot air guided below the object was provided on both sides of the object. and to provide a circulating guide member for guiding the outside of the guide regulating plate. In this way, the guide regulating plates prevent the hot air from being guided to the positions on both sides apart from the top of the object to be processed, and the hot air flows downward from above the object to be processed through the pair of guide restricting plates. The hot air guided to the lower side of the object to be processed is guided to the outside of the guide regulation plates provided on both sides of the object to be processed by the circulation guide member. Will be circulated. In addition, the hot air guided to the lower side of the object to be processed is guided by the circulation guide member to the outside of the guide regulating plates provided on both sides of the object to be circulated inside the furnace. During the course of this, the hot air is heated sufficiently by the heating device to be circulated, and the hot air that is sufficiently heated is stably directed downward from above the object to be treated introduced into the furnace. Then, the object to be processed is sufficiently heated.

Here, it is preferable that the guide regulating plate is made of a heat storage material and that the guide regulating plate is provided from the side wall of the opening to the side wall opposite to the opening. By doing so, heat is accumulated in the guide regulating plate, the object to be treated is uniformly heated by the radiation from the guide regulating plate, and when the object to be treated is newly introduced, As described above, the heat is stored in the object, and the object is quickly heated by the radiation from the guide regulating plate. The heat storage material here may be any material such as a plate-shaped ceramic fiber board, a ceramic plate, or a carbon plate.

Further, in another heat treatment furnace of the present invention, a door for opening and closing the opening provided on the side wall of the furnace is provided, and the object is introduced into the furnace from the opening by opening and closing the door, The hot air heated by the heating device is blown downward from above the object to be treated, and in the heat treatment furnace for heating the object to be treated, the hot air is circulated inside the furnace, and the hot air is aforesaid. A slit-shaped shielding hot-air blowout port that blows downward from above is provided along the opening of, and a plurality of roller members for introducing and holding the object to be treated are provided inside the furnace, and the roller member is provided. from above the object to be processed held on the Upon blowing hot air downward, and to providing a plurality of slit-shaped hot air blow port in the axial direction of the roller member above the object to be processed. With this configuration, the hot air blown out from the slit-shaped hot air outlet along the axial direction of the roller member is smoothly guided below the roller member without being disturbed by the roller member and circulated inside the furnace. Become so.

Further, in another heat treatment furnace of the present invention, a door for opening and closing the opening provided on the side wall of the furnace is provided, and the object is introduced into the furnace from the opening by opening and closing the door, The hot air heated by the heating device is blown downward from above the object to be processed, and in the heat treatment furnace for heating the object to be processed, the hot air is circulated inside the furnace, and the hot air is aforesaid. A slit-shaped shielding hot-air blowing outlet that blows downward from above along the opening is provided, and the hot air blown from the shielding hot-air blowing outlet is provided at the lower end of the opening inside the furnace. It was to provide a shield for the guide member for guiding to. In this way, the hot air blown downward from above along the opening from the shielding hot air outlet is guided to the inside of the furnace by this shielding guide member, and the door at the lower end of the opening is It will be prevented from being blown outside through the gap of.

In the heat treatment furnace in the present invention, when the door is opened as described above and the object to be treated is introduced into the furnace from the opening, hot air is blown from the slit-shaped shielding hot air outlet to the opening. Since the air is blown downward from above, the hot air blown downward from above along the opening from the slit-shaped shielding hot air outlet forms an air curtain of hot air in the opening. Rather than an air curtain that uses cold air (normal temperature air) outside the furnace, the cold air outside flows into the furnace through the opening where the door is opened, and the hot air circulated inside the furnace It is prevented from blowing outside.

As a result, in the heat treatment furnace of the present invention, when the door is opened and the object to be treated is introduced into the furnace from the opening as described above, or when the object is pulled out from the inside of the furnace, the temperature inside the furnace is It is possible to prevent lowering, and it is not necessary to stop the operation of blowing the hot air heated by the heating device from the upper side to the lower side of the object to be processed. The processed product can be processed efficiently.

In the heat treatment furnace according to the embodiment of the present invention, showing a state in which a door provided on the side wall of the furnace is opened to introduce the object to be processed into the furnace through the opening, and the furnace is installed along the introduction direction of the object to be processed. It is the schematic cross section explanatory drawing cut. In the heat treatment furnace according to the above-described embodiment, it is a partially enlarged cross-sectional explanatory view showing a state in which a door provided on the side wall of the furnace is opened to introduce the object to be processed into the furnace through the opening. In the heat treatment furnace according to the above embodiment, a state in which the object to be treated is introduced into the furnace to close the door to heat treat the object to be treated, and a schematic cross section of the furnace cut along the introduction direction of the object to be treated is shown. FIG. In the heat treatment furnace according to the embodiment described above, showing a state in which the object to be treated is introduced into the furnace to close the door to heat treat the object, and the furnace is installed along a direction orthogonal to the introduction direction of the object to be treated. It is the schematic cross section explanatory drawing cut. It is a schematic plan view seen from the upper surface side of the heat treatment furnace according to the embodiment.

Hereinafter, a heat treatment furnace according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. The heat treatment furnace according to the present invention is not limited to the one shown in the following embodiment, and can be appropriately modified and implemented within a range not changing the gist of the invention.

Here, in the heat treatment furnace according to this embodiment, as shown in FIGS. 1 to 5, an opening 12 is provided on one side wall 11 a of the furnace 10 for loading and unloading the workpiece W into and from the furnace 10. There is. A door 13 for opening and closing the opening 12 is provided outside the opening 12, and the inside and outside of the furnace 10 are shielded around the surface of the door 13 facing the side wall 11a of the furnace 10. The packing material 13a is attached.

Further, a plurality of roller members 14 for holding the object W to be processed are provided in the furnace 10 through the opening 12 at predetermined intervals in the feed direction of the object W to be processed, and each roller member 14 is rotated. The object to be processed W is moved.

Further, in the above heat treatment furnace, when the heated hot air is blown downward from above the workpiece W held by the roller member 14, it is provided in the central portion of the ceiling 15 of the furnace 10. The blower fan 16a rotated by the rotating device 16 is provided inside the furnace 10 so as to penetrate the ceiling 15 and penetrates the ceiling 15 in the peripheral portion of the ceiling 15 separated from the rotating device 16. The heating unit 17 a is provided with a plurality of heating devices 17 extending inside the furnace 10. In addition, in this embodiment, an example in which four heating devices 17 are provided in the peripheral portion of the ceiling 15 away from the rotating device 16 is shown, but more heating devices are provided depending on the size of the furnace 10. 17 may be provided.

Further, in the heat treatment furnace, when the blower fan 16a is rotated to blow the hot air heated by the heating device 17 downward from above the workpiece W held by the roller member 14, the furnace 10 A pair of guide regulation plates 18 along the introduction direction of the object to be processed W are provided inside the chamber from the side wall 11a provided with the opening 12 to the side wall 11b on the side opposite to the opening 12. The upper guide members 19 are provided on both sides of the object to be processed W and between the upper end of each guide regulating plate 18 and the blower fan 16a. Then, the hot air after being heated by the heating device 17 is guided to the blower fan 16a via the upper guide member 19, and the hot air is directed from the side wall 11a provided with the opening 12 to the opening 12 by the blower fan 16a. The hot air is guided downward from above the object W to be processed through a pair of guide regulating plates 18 provided so as to reach the side wall 11b on the side. With this configuration, the hot air after being heated by the heating device 17 can be appropriately blown from above the object W to be processed held by the roller member 14 through the space between the pair of guide regulating plates 18.

In this embodiment, the guide regulating plate 18 is made of heat-accumulating ceramic fiber. In this way, the heat generated by the heating device 17 and the hot air is stored in the guide regulating plate 18 made of a heat-accumulating ceramic fiber, and the object to be treated introduced into the furnace 10 by radiation from the guide regulating plate 18. Even if W is uniformly heated and a new object W is introduced into the furnace 10, the new object W can be quickly heated by the heat accumulated in the guide regulation plate 18. Like

Further, in the heat treatment furnace of this embodiment, when the hot air is blown from above the workpiece W through the pair of guide regulation plates 18 by the blower fan 16a as described above, the space between the pair of guide regulation plates 18 is increased. In the same manner as the guide regulating plate 18, the hot air guide member 20 for guiding the hot air blown downward by the blower fan 16a to the object to be processed W is provided on the side wall provided with the opening 12. It is provided so as to extend from 11a to the side wall 11b on the side opposite to the opening 12.

Here, as the hot air guide member 20, one provided with a plurality of slit-like hot air outlets 21 that are contracted downward along the axial direction of the roller member 14 is used. On the side of the opening 12 side, a shielding hot air outlet 21a having a long slit-shaped portion for blowing hot air downward from above along the opening 12 is provided, while the side wall on the side opposite to the opening 12 is provided. Along the inner surface of 11b, there is provided a hot air outlet 21b on the opposite side in which a slit-shaped portion for blowing hot air downward is extended.

Then, when hot air is blown downward from above from the shielding hot air outlet 21a along the opening 12, an air curtain by the hot air is formed in the opening 12, and the door 13 is opened as described above. Then, when the object W to be treated is introduced into the furnace 10 through the opening 12, cold air outside flows into the furnace 10 through the opened opening 12 and is circulated inside the furnace 10. Hot air is prevented from blowing outside. Also, when hot air is blown downward from above along the inner surface of the side wall 11b on the side opposite to the opening 12 from the opposite side hot air outlet 21b, the side wall 11b on the side opposite to the opening 12 is heated by this hot air. As a result, the temperature of the inner surface of the side wall 11b on the side opposite to the opening 12 is lowered by the temperature of the outside (outer surface) cool air being conducted through the side wall 11b, and the temperature around the object to be processed W is lowered. It is possible to prevent unevenness. The cold air referred to here is room temperature air outside the furnace 10.

Further, in the heat treatment furnace of this embodiment, a roller member 14 for loading and unloading the workpiece W into and from the furnace 10 is provided in the opening 12 and an opening on the outer side of the roller member 14 is provided. A shielding guide member 22 having an L-shaped cross section is provided at the lower end of the portion 12 to guide the hot air blown from the shielding hot air outlet 21a to the inside of the furnace 10. By doing so, the hot air blown downward from above along the opening 12 from the shielding hot air outlet 21a flows to the outside of the roller member 14 provided at the opening 12. Even in this case, the hot air is guided to the inside of the furnace 10 by the shielding guide member 22, and the hot air is suppressed from flowing out from the lower end of the opening 12.

Further, in the heat treatment furnace of this embodiment, when the hot air is blown downward from above the workpiece W held by the roller member 14, in the hot air guide member 20 as described above, Since the hot air is blown from the upper side to the lower side from each slit-shaped hot air outlet 21 along the axial direction, the hot air blown from each hot air outlet 21 passes between the roller members 14 to pass through the roller members 14. It will be smoothly guided downward. (See Figure 2.)

Further, in the heat treatment furnace of this embodiment, as described above, when circulating the hot air guided between the roller members 14 and below the roller members 14 inside the furnace 10, as described above, Circulation guide members 23 for guiding the hot air guided downward to the outside of the guide regulation plates 18 on both sides of the workpiece W are provided below the roller members 14 toward both sides of the furnace 10.

Then, the hot air guided to the lower side of the roller member 14 as described above is guided to the outside of the guide regulating plates 18 on both sides above the roller member 14 holding the object to be processed W by the circulation guide members 23 on both sides. The hot air that is guided and thus guided upward through the outside of the guide regulation plates 18 on both sides is heated by the heating devices 17, and the hot air that has been heated by the heating devices 17 is heated by the upper guide member. The air is guided to the blower fan 16a via 19, and hot air is blown by the blower fan 16a from above to below the workpiece W held by the roller member 14 through the hot air guide member 20 as described above. It circulates inside the furnace 10.

With this configuration, when the door 13 is opened and the workpiece W is introduced into the furnace 10 through the opening 12 as described above, the opening 12 is opened from the slit-shaped shielding hot air outlet 21a. The hot air blown downward from above along the direction forms an air curtain of the hot air in the opening 12, and outside cold air flows into the furnace 10 through the opening 12 in which the door 13 is opened. It is possible to prevent the temperature inside the furnace 10 from lowering due to the hot air circulated inside 10 blowing out to the outside, and the hot air heated by the heating device 17 is blown by the blower fan 16a. It is not necessary to stop the operation of spraying W from the upper side to the lower side, and the object W can be efficiently processed.

Further, even while the object W to be processed is introduced into the furnace 10 and the door 13 is closed, the hot air flow from the shielding hot air outlet 21a acts to heat the inner surface of the door 13, so that the door 13 is closed. It is prevented that the temperature of the cold air outside of the door conducts through the door 13 and the temperature around the object W is lowered or becomes non-uniform.

In the above embodiment, the air curtain is blown with hot air in the vertical direction from the upper side to the lower side of the workpiece W, but the structure may be devised to blow the air curtain in the horizontal direction. Alternatively, the spray may be applied from the bottom to the top.

10: Furnace 11a: Side wall 11b on the opening side: Side wall 12 on the side opposite to the opening 12: Opening 13: Door 13a: Packing material 14: Roller member 15: Ceiling 16: Rotating device 16a: Blower fan 17: Heating device 17a : Heating part 18: Guide regulation plate 19: Upper guide member 20: Hot air guide member 21: Hot air outlet 21a: Shielding hot air outlet 21b: Opposite hot air outlet 22: Shielding guide member 23: Circulation guide member W : Object to be processed

Claims (7)

A door for opening and closing the opening provided in the side wall of the furnace is provided, and the door is opened and closed to introduce the object to be processed into the furnace through the opening, and the hot air heated by the heating device is treated as described above. In a heat treatment furnace that blows downward from above the object to heat the object to be processed, the hot air is circulated inside the furnace, and the hot air is directed downward from above along the opening. A slit-shaped shielding hot air outlet for spraying is provided , and when circulating the hot air inside the furnace, a pair of guide regulation plates along the introduction direction of the object to be treated inside the furnace are introduced. The hot air is guided downward from above the object to be processed through the pair of guide regulation plates, and the hot air guided below the object to be processed is provided on both sides of the object to be processed. A heat treatment furnace, which is provided with a circulation guide member for guiding to the outside of the guide regulation plate . The heat treatment furnace according to claim 1 , wherein the guide regulating plate is made of a heat storage material, and the guide regulating plate is provided from a side wall of the opening to a side wall opposite to the opening. And a heat treatment furnace. A door for opening and closing the opening provided in the side wall of the furnace is provided, and the door is opened and closed to introduce the object to be processed into the furnace through the opening, and the hot air heated by the heating device is treated as described above. In a heat treatment furnace that blows downward from above the object to heat the object to be processed, the hot air is circulated inside the furnace, and the hot air is directed downward from above along the opening. Providing a slit-shaped shielding hot air outlet for spraying, providing a plurality of roller members for introducing and holding the object to be treated inside the furnace , from above the object to be treated held on the roller member. When blowing hot air downward, a plurality of slit-like hot air outlets are provided above the object to be processed along the axial direction of the roller member, which is a heat treatment furnace. A door for opening and closing the opening provided in the side wall of the furnace is provided, and the door is opened and closed to introduce the object to be processed into the furnace through the opening, and the hot air heated by the heating device is treated as described above. In a heat treatment furnace that blows downward from above the object to heat the object to be processed, the hot air is circulated inside the furnace, and the hot air is directed downward from above along the opening. A slit-shaped shielding hot air outlet for spraying was provided, and a shielding guide member for guiding the hot air blown out from the shielding hot air outlet to the inside of the furnace was provided at the lower end of the opening. Characteristic heat treatment furnace. The heat treatment furnace according to claim 3 or 4, wherein when the hot air is circulated inside the furnace, a pair of guide regulation plates introduced along the introduction direction of the object to be treated is introduced into the furnace. The hot air is provided so as to be arranged on both sides of the object to be processed, and the hot air is guided downward from above the object to be processed through the pair of guide regulation plates, and the hot air guided below the object is provided to both sides of the object to be processed. A heat treatment furnace characterized in that a circulation guide member for guiding the outside of the guide regulation plate is provided . The heat treatment furnace according to any one of claims 1 to 5 , wherein the hot air is blown downward from above along the inner surface of the side wall on the opposite side of the opening from the slit-like hot air on the opposite side. A heat treatment furnace characterized by having an outlet. In the heat treatment furnace according to any one of claims 1 to 6, in circulating the hot air heated by the heating device inside the furnace, the hot air heated by the heating device is supplied to the furnace by a blower fan. It is characterized in that the object to be treated introduced therein is blown downward to heat the object to be treated, and hot air after heating the object to be treated is guided to the heating device to be heated and circulated. And a heat treatment furnace.

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