JP4192310B2 - Apparatus for forming gaps between stacked heat-treated products - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for forming a gap between stacked heat-treated products, which are intended for heat-treated products stacked in a stack for efficient heat treatment in a heat treatment furnace.
[0002]
[Prior art]
1, 2, 3, and 4 are for explaining an embodiment of the present invention. In these drawings, configurations denoted by reference numerals 1 to 25 and 33 to 45 have been conventionally known. It is a configuration. Therefore, a conventional example will be described with reference to FIGS.
[0003]
In these heat treatment furnaces shown in FIGS. 1 and 2, reference numeral 1 denotes a batch type vacuum furnace as an example of a vacuum heating furnace. Reference numeral 2 denotes a furnace shell in the vacuum furnace, which is composed of a cylindrical main body 3, a cooling equipment surrounding wall 3 a connected to one end of the main body 3, and a door 4 provided at an entrance on the opposite side. is there. These are all constituted by a water cooling jacket, for example. Reference numeral 5 denotes a heat insulating wall provided as necessary, which is composed of a main body 6 and a door 7 provided at the entrance / exit of the main body 6 and a door 8 provided on the opposite side thereof, and the inner space is a heat treatment chamber. It has become. The doors 7 and 8 are closed when the processed product is heated and opened when the processed product is cooled. Reference numeral 10 denotes a mounting table provided in the heat treatment chamber, and the space above it is a storage space 11 for processed products. Reference numeral 12 denotes a heating means disposed around the storage space 11, and an electric heater is used as an example and is attached to a heat insulating wall.
[0004]
Next, reference numeral 17 shown in FIG. 2 is a vacuum device for evacuating the inside of the furnace shell 2, and an oil rotary pump or other known vacuum pumps are used. An exhaust pipe 18 connects the inside of the furnace shell 2 and the vacuum device 17. Although not shown, the furnace shell 2 is connected with a gas supply means (not shown) for sending a heat treatment gas (for example, hydrogen, reactive gas) according to the heat treatment of the processed product.
[0005]
Next, referring again to FIG. 1, reference numeral 21 denotes a known cooling structure for the processed product, which will be described below. 22 is a cooler and 23 is a circulation fan, which is operated by a fan motor 24. Reference numeral 25 denotes a motor cover for holding a vacuum.
[0006]
Next, processing of the processed product using the vacuum furnace will be described. The doors 4 and 7 are opened, and the processed product 31 is moved from the left direction in FIG. 1 toward the mounting table 10 and placed thereon. Next, the doors 4 and 7 are closed, the vacuum device 17 is operated, and the inside of the furnace shell 2 is evacuated, and it is heated by energization of the heater 12, and heating of the processed product 31 is started.
[0007]
If predetermined heat is applied to the processed product 31, the energization to the heater 12 is stopped, the cooling gas is introduced into the furnace shell 2, and the cooler 22 and the fan 23 are operated as is well known. Then, the processed product 31 is cooled. When the cooling is completed, the doors 4 and 7 are opened, and the processed product 31 that has been processed is taken out.
[0008]
Next, FIG. 3 shows a continuous vacuum furnace as another example of a conventional vacuum heating furnace. The vacuum furnace 1e includes a front chamber 33, a main processing chamber 34, and a cooling chamber 35. The front chamber 33 has an inlet 36 for receiving processed products, and a door 37 operated by an opening / closing device 38 is provided there. Partitions 39 partition the front chamber 33 and the main processing chamber 34, and the main processing chamber 34 and the cooling chamber 35, respectively. Each partition wall 39 is provided with an opening for passing a processed product, and a door 40 operated by an opening / closing device 41 is provided in the opening. The main processing chamber 34 is provided with heat retaining means as shown in the previous embodiment. Individual vacuum devices are connected to the front chamber 33 and the main processing chamber 34, respectively. The cooling chamber 35 has an outlet 42, which is provided with a door 43 operated by an opening / closing device 44. The cooling chamber 35 is connected with a gas supply means (not shown) for feeding a cooling gas. Reference numeral 45 denotes a conveying means provided through the front chamber 33, the main processing chamber 34, and the cooling chamber 35, for example, using a roller.
[0009]
The vacuum furnace 1e as described above is used, for example, for sintering a powder metal molded product. The treated product 31e is first placed in the front chamber 33, and a known pretreatment is performed. Next, the processed product 31e is put into the main processing chamber 34, where the main heat treatment is performed in a vacuum state. In this case, the vapor generated from the processed product 31e is prevented from condensing in the same manner as in the previous embodiment. When the predetermined heat treatment is finished in the main processing chamber 34, the processed product 31e is put into the cooling chamber 35, where it is cooled to a normal low temperature, and then sent out from the outlet 42. In the vacuum furnace 1e, both or one of the front chamber 33 and the cooling chamber 35 may be provided with a heat retaining means as shown in the previous embodiment. In addition, the part considered to be the same as that of the previous figure functionally, or the structure equivalent to the previous figure attaches the alphabet e to the same code | symbol as the previous figure, and the overlapping description was abbreviate | omitted.
[0010]
[Problems to be solved by the invention]
When heat-treating stacked heat-treated products using this conventional heat treatment furnace, the stacked state of the heat-treated products 31 is shown in FIG. 4 (A) in order to put a large amount of the heat-treated products 31 into the small heat insulation wall body 6. As described above, it is preferable to eliminate the gap between the plurality of heat-treated products 31 on the tray 26 so as to be in a close contact state. However, when densely stacked as shown in FIG. 4A, the circulation state of the atmospheric gas is poor both in a low temperature range (for example, 500 ° C. or lower) and in a high temperature range, and a sufficient convection heating (cooling) effect cannot be expected. Further, as a matter of course, there is a problem in that there is no heating effect due to sufficient radiant heat in a low temperature range, the temperature distribution is poor, the temperature raising (cooling) time becomes long, and variations occur.
[0011]
In order to solve the above problems, as shown in FIG. 4 (B), the heat-treated products 31 stacked on the tray 26 are placed on the processed product shelves 30 framed by the support pillars 28 and the shelves 27, respectively. A gas circulation space (gap) 29 is formed above each heat-treated product 31.
In this way, as apparent from the comparison between FIGS. 4A and 4B, the height H2 in FIG. B becomes higher than the height H1 in FIG. In this case, there arises an economic problem that the inside of the furnace shell 2 and the main body 6 of the heat insulating wall must be enlarged corresponding to the height H2. At the same time, when the processed product shelf 30 is formed as shown in FIG. 4B, the heat capacity increases by the amount of the material, and the amount of contamination such as moisture and oxygen increases. In addition, there is a problem that the extra cost for manufacturing the processed product shelf 30 (the cost of the processed product shelf 30 being a consumable item) increases.
[0012]
The gap forming apparatus between the stacked heat-treated products of the present application is provided to solve the above-mentioned problems of the prior art.
The purpose of the present application is to normally stack a plurality of heat-treated products 31 in a dense manner so as to reduce the bulk in the height direction and to form a space between the plurality of heat-treated products 31 as necessary. It is an object of the present invention to provide an apparatus for forming a gap between stacked heat-treated products.
The other purpose is to make the shape of the shelf interposed between the heat-treated products 31 simple by making the upper and lower heat-treated products 31 in close contact with each other. An object of the present invention is to provide an apparatus for forming gaps between stacked heat-treated products in which the number of product shelves 30 is reduced and the heat capacity, moisture, oxygen amount, etc. associated therewith are reduced.
Another object is that in a continuous furnace, the bulk of the heat-treated product 31 may be increased in a furnace that treats the heat-treated product 31 at a relatively low temperature, but in a furnace that treats the heat-treated product 31 at a high temperature. An object of the present invention is to provide an apparatus for forming a gap between stacked heat-treated products that can reduce the volume of the heat-treated products 31.
Other objects and advantages will be readily apparent from the drawings and the following description associated therewith.
[0013]
[Means for Solving the Problems]
An apparatus for forming a gap between stacked heat-treated products in the present invention includes a connector for detachably connecting to each heat-treated product, and a connector in a state of being connected to the heat-treated product. A device for forming a gap between stacked heat-treated products having driving means for separating the connectors located above and below, and a space for positioning the heat-treated products in a stacked state in a heat treatment furnace In order to form a gap between the upper and lower sides of the stacked heat-treated products to be left in the space, the connector is arranged on the side.
Preferably, a connector for detachably connecting to each of the heat-treated products and a connector located on the upper and lower sides of the connectors in a state of being connected to the heat-treated products are separated from each other. A device for forming a gap between stacked heat-treated products provided with a driving means for the space, and a side of a space where the heat-treated products in a stacked state are located in at least one heat treatment furnace in a multi-chamber continuous heat treatment furnace On the other hand, the connector is arranged in order to form a gap between the upper and lower sides of the stacked heat-treated products to be placed in the space .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, drawings showing embodiments of the present invention will be described. In FIGS. 1 to 5, the functions, properties, features, etc. of the components, members, etc. that are given the same reference numerals as those in FIGS. 1 to 4 can be understood as the same as the above description except for the new configurations. Description of the parts to be performed is omitted.
[0015]
Next, an apparatus for forming a gap between stacked heat-treated products will be described.
In the gap forming device 50 provided in the heat treatment furnace 1, 51 is arm support rods fixedly provided on both sides of the storage space 11 of the article to be heat treated 31 and is connected to the furnace shell 2, and the arm 52 The former part 52a is pivotally supported. 53 is a connector for detachably connecting to each heat-treated product, and is configured by attaching a roller to the tip of the arm 52. In the illustrated example, the article to be heat-treated is a small item, and a large number of cases are accommodated in the case 31, and the reference numeral substantially designates the case as the article 31 to be heat-treated. The heat-treated product 31 may be in the form of one large lump in addition to a case-containing accessory. In the illustrated example, the case 31 has a weak configuration, so that the convex portions 27a are formed on both sides of the shelf 27 made of carbon. As shown in FIG. 5 (B), a case 27 or a lump that can be handled as an article 31 can be directly attached to or detached from the connector 53 by attaching a convex portion 27a or forming a concave portion for engagement / disengagement. May be combined.
[0016]
54 is a drive means for separating the connectors located on the top and bottom of the connectors 53, 53, 53 in a state of being connected to the heat-treated products 31, 31, 31, 31; The arm 52 and a drive source for lifting the arm 52, for example, a hydraulic cylinder 54a are provided. Reference numeral 55 denotes a vertical drive member, which is connected to the arm 52 at the continuous portion 56. The vertical drive member 55 may be a chain or a wire that can be freely expanded and contracted by bending. The interval between the connecting portions 56, 56 is such that the lower part is small and the upper part is large. As shown in the drawing, the height position of the lifting roller 53a serving as the connector 53 is such that when the article to be heat-treated 31 is inserted into or removed from the outside of the furnace, the protrusion 27a for engagement is provided. They are located at the upper and lower intermediate positions where they do not collide.
[0017]
In the above configuration, when the article to be heat-treated 31 is inserted into the storage space 11 in the furnace 2 and the heat treatment is started, the hydraulic cylinder 54a is operated to pull up the chain that is the vertical drive member 55. Then, as shown in FIG. 5A, the uppermost chain 55a extends, the lifting roller 53a rises, lifts the convex part 27a of the uppermost shelf, and is placed on the upper part of the heat-treated product 31 located on the lower side. A slight gas circulation space 29 is formed. Subsequently, the next-stage chain 55b extends, the next-stage lifting roller 53a rises, the convex part 27a on the next-stage shelf plate is lifted, and a gas flow space 29 is also formed above the heat-treated product 31 in the next stage. To do. In this way, the gas circulation space 29 is formed in the upper part of each of the heat-treated products 31 that are sequentially located in the lower stage.
[0018]
In this manner, even if the article to be heat-treated 31 is inserted into the furnace 2 in the state shown in FIG. 4A, the treated product shown in FIG. A gas circulation space 29 is formed above each of the heat-treated products 31 as if it were supported by the shelf 30.
[0019]
As described above, when the gap 29 is present on the upper side of the article to be heat-treated 31, the heating and cooling effects in the low temperature range are remarkably promoted.
For example, as shown in FIG. 4B, the upper and lower dimensions of the gas flow gap 29 are formed on the upper part of the heat-treated product 31, and the upper part of the heat-treated product 31 is in close contact with the upper stage as shown in FIG. In the case where the gap is zero, the temperature distribution of the heat-treated product 31 is improved as follows in the former as compared with the latter.
(1) When the furnace atmosphere temperature is 100 ° C., the former is excellent at 4.8 ° C., whereas the latter is inferior at 6.7 ° C.
(2) When the furnace atmosphere temperature is 150 ° C, the former is excellent at 5.0 ° C, while the latter is inferior at 7.8 ° C.
(3) When the furnace atmosphere temperature is 550 ° C, the former is excellent at 8.1 ° C, while the latter is inferior at 11.2 ° C.
[0020]
Next, the gap forming means (device) 50 shown in FIG. 6 shows an example using a rod-like body generally having high heat resistance (higher heat resistance than the chain of FIG. 5A) as the vertical drive member 55. According to this rod-like body, a cooling means can be attached because it is not bent.
If the connecting point 56 of each arm 52 is different from the base in the length direction of the arm as described above, even if the lifting dimension in the arrow direction of the vertical drive member 55 is the same, the arm Lifting dimensions in the direction of the arrows of the respective connectors 53 with the base portion 52a as a fulcrum are different from each other, and as shown in FIG. Can do. These gap forming means 50 are provided inside the furnace shown in FIGS. 1 and 2, but when natural air is used for cooling, an apparatus 50 is installed outside the furnace and the article 31 to be heat treated is shown there. 4 (A) may be brought in and used as shown in FIG. 5 (A).
[0021]
Next, for the continuous furnace shown in FIG. 3, the gap forming means 50 is provided in the front chamber 33 and the cooling chamber 35 that are heat-treated at a relatively low temperature. This arrangement state is preferably arranged on both sides of the passage of the heat-treated product 31 based on the same idea as in FIGS. Of course, it may be arranged in the main processing chamber 34. When arranged in this manner, in the front chamber 33 and the cooling chamber 35, as shown in FIG. 5A, heat treatment is performed with good ventilation efficiency by opening gaps 29 between the upper and lower portions of the stacked heat-treated products 31. In the main processing chamber 34, the gap 29 is eliminated, that is, the overall height dimension of the laminated heat-treated product 31 is reduced, and a large amount of the heat-treated product 31 is placed in a high-temperature treatment furnace. The effect of heat treatment can be expected.
[0022]
【The invention's effect】
As described above, the present invention normally has a plurality of heat-treated products stacked and transported in a small volume, and is subjected to high heat treatment, for example, in heat treatment in a low temperature range, if necessary. There is an effect that gaps are formed between the stacked heat-treated products, the temperature raising and cooling rates are increased, the temperature distribution is improved, or the cooling is uniform.
[0023]
In addition, since there is no need for a space between the stacked heat-treated products in the normal state, the treated product shelf 30 interposed between the heat-treated products can be reduced to a simple material, thereby reducing material costs and heat capacity. be able to.
[0024]
When installed in a continuous furnace, in the low temperature range, the gap-forming means 50 is used to bulk up the laminated heat-treated products (by forming an interval 29), for furnaces manufactured with a small capacity for high-temperature processing. A processing method such as eliminating the gap 29 and corresponding to a small bulk shape can be expected.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a vacuum furnace.
2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a schematic cross-sectional view of a continuous vacuum furnace.
FIG. 4 is a schematic cross-sectional view shown for comparison of stacked states of heat-treated products.
FIG. 5 is a schematic cross-sectional view for explaining a connection state of stacked heat-treated products.
FIG. 6 is a schematic front view showing a different example of the gap forming device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vacuum furnace 2 Furnace shell 3 Furnace shell main body 4 Door 5 Thermal insulation wall 6 Thermal insulation wall main body 7 Door 8 Door
10 mounting table
11 Reservation space
12 Heating means
17 Vacuum equipment
18 Exhaust conduit
21 Cooling structure
22 Cooler
23 fans
24 fan motor
25 Motor cover
26 trays
27 Shelf
27a Convex
28 Support pillar
29 Distribution space
30 Processed product shelf
31 Heat treated products
33 Front room
34 Main processing room
35 Cooling room
36 entrance
37 Door
38 Switchgear
39 Bulkhead
40 doors
41 Switchgear
42 Exit
43 Door
44 Switchgear
45 Transport means
50 Gap forming means
51 support
52 arms
52a base
53 connector
53a Lifting roller
54 Drive means
54a Hydraulic cylinder
55 Vertical drive member
56 connections

Claims (2)

A drive for detachably connecting a connector for removably connecting to each product to be heat-treated and a connector located above and below among the connectors in a state of being connected to the product to be heat-treated A gap forming device between stacked heat-treated products,
On the side of the space to position the thermally treated product state stack in the heat treatment furnace, in order to form a gap between the upper and lower cross of the heat-treated product of the stacked state is of stripping in the space, in that a said coupling element A device for forming a gap between stacked heat treated products. A drive for detachably connecting a connector for removably connecting to each product to be heat-treated and a connector located above and below among the connectors in a state of being connected to the product to be heat-treated A gap forming device between stacked heat-treated products,
A multi-chamber type side of the space is positioned to be heat-treated product of the state stack at least a room heat treatment furnace in a continuous heat treatment furnace, to form a gap between the upper and lower cross of the heat-treated product of the stacked state is of stripping to the space Therefore, an apparatus for forming a gap between stacked heat-treated products, wherein the connector is arranged.

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