JPH0726694U - Continuous heat treatment furnace - Google Patents

Abstract

(57) [Summary] [Objective] To provide a heat treatment furnace capable of shortening the cycle time and improving the production efficiency. [Structure] A processing chamber 30 whose inside can be sealed, a pre-chamber 31 which is provided so as to be connected to an inlet of the processing chamber and which replaces the inside with the same atmosphere as the processing chamber, and an outlet of the processing chamber The rear chamber 32, which is provided as a substitute and replaces the inside with the atmosphere.
And a first transfer device 33 for transferring the object to be processed M from the front chamber to the processing chamber, and a second transfer device 35 for transferring the object to be processed from the processing chamber to the rear chamber,
The inside of the processing chamber is divided into a heating zone 42 and a cooling zone 44, and a transfer device 34 for continuously transferring the objects to be processed carried in from the front chamber in a line from the heating zone to the cooling zone. Is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat treatment furnace capable of continuously performing heating and cooling treatments, and more particularly, to a continuous heat treatment furnace in which a substitution chamber for displacing the same atmosphere as the treatment chamber is provided before and after the treatment chamber. Is.

[0002]

[Prior art]

 In recent years, as a continuous heat treatment furnace, a multi-chamber heat treatment furnace, which is more advantageous in terms of production efficiency and energy efficiency than a single-chamber batch heat treatment furnace, has been widely used.

FIG. 12 shows a hot press machine as an example of a conventional multi-chamber continuous heat treatment furnace. In this hot press device, a hot press chamber 2 is formed by a heat insulating material in the center of the device main body 1, a front chamber 3 is arranged in front of the inlet, and a cooling chamber 4 is arranged behind the outlet. It is of a three-chamber type and is configured to transfer the object to be treated 5 from the front chamber 3 to the hot press chamber 2 and the cooling chamber 4 for continuous treatment.

The object 5 to be processed is one in which an upper punch 8 and a lower punch 9 are mounted above and below a cylindrical die 7 filled with a powdery sample 6.

The hot press chamber 2 is provided with an upper press ram 10 and a lower press ram 11 on the upper and lower sides thereof, respectively, and is provided with a heater 12 inside, and the workpiece 5 is placed on the upper end of the lower press ram 11. Then, while heating the workpiece 5 with the heater 12, the press cylinder 13 is operated to push up the lower press ram 11 to support its bottom surface with a stopper (not shown), and the upper press ram 10 holds the upper punch 8 against the die 7. And relatively lowers the sample 6 in the object to be processed 5 at high temperature.

The front chamber 3 is for storing the unprocessed object 5 and the cooling chamber 4 is for cooling the unprocessed object 5. A door 14 for opening and closing the insertion port is provided in the front part of the vehicle, and an intermediate door 15 for opening and closing a passage leading to the hot press chamber 2 is provided in the rear part thereof. A door 16 for opening and closing the outlet is provided at the rear of the vehicle, and an intermediate door 17 for opening and closing the passage leading to the hot press chamber 2 is provided at the front. The intermediate door 15 is provided with a door 18 provided at the front of the hot press chamber 2, and the intermediate door 17 is provided with a door 19 provided at the rear of the hot press chamber 2 by air cylinders 20 and 21, respectively. It is designed to be pulled up.

The hot press chamber 2, the antechamber 3, and the cooling chamber 4 can individually adjust the atmosphere such as the degree of vacuum and the temperature inside them. An atmosphere gas supply device, a temperature control device, and the like are provided.

Further, inside the front chamber 3 and the cooling chamber 4, there are provided telescopic type transfer devices 22, 23 which are respectively extendable and retractable and whose front end portions can enter the hot press chamber 2. The transfer device 22 in the front chamber 3 transfers the unprocessed object 5 from the front chamber 3 to the hot press chamber 2, and the transfer device 23 in the cooling chamber 4 transfers the processed object 5 after processing. The hot press chamber 2 is taken out to the cooling chamber 4.

In the conventional continuous heat treatment furnace, the object to be treated 5 stored in the front chamber 3 is transferred into the hot press chamber 2 by the transfer device 22, and the intermediate door 15 and the door 18 are closed to perform hot processing. After adjusting the vacuum degree and temperature in the press chamber 2 to a predetermined level, the hot press process is performed there. After the process is completed, the intermediate door 17 and the door 19 are opened and the workpiece 5 is transferred to the cooling chamber 4 by the transfer device 23. It is transferred, cooled there for a predetermined time, and then taken out from the outlet. When the object 5 is transferred from the front chamber 3 to the hot press chamber 2 or from the hot press chamber 2 to the cooling chamber 4, prior to opening or closing the door or intermediate door between them. Adjust the atmosphere in both rooms to the same atmosphere.

Immediately after the object 5 to be processed is transferred from the front chamber 3 to the hot press chamber 2, the object 5 to be processed next is stored in the front chamber 3, and the finished object 5 after the hot pressing process is finished. When the processed material 5 is transferred to the cooling chamber 4, the processed material 5 in the front chamber 3 is immediately transferred to the hot press chamber 2 and continuously processed, so that the cycle time can be shortened as compared with the case of batch processing. It can be shortened and productivity can be improved. For example, if the processing time is 9 hours for hot pressing (including 6 hours as the temperature rising time prior to pressing) and 3 hours for cooling, the cycle time in a batch heat treatment furnace is Although it takes 12 hours, in the above-mentioned three-chamber continuous hot pressing apparatus, since hot pressing and cooling can be performed at the same time, the cycle time can be shortened to 9 hours as shown in FIG. .

[0011]

[Problems to be solved by the device]

 However, in the above-mentioned conventional hot press apparatus, since the object 5 to be processed is heated in the hot press chamber 2 from a low temperature state, as shown in FIG. It takes time). Therefore, although the cycle time can be shortened compared to the batch type, it is not always fully satisfactory. Therefore, for the purpose of further shortening the cycle time, a preheating chamber is provided in place of the front chamber 3 in the three-chamber hot pressing apparatus, and the preheating chamber is provided before the object 5 is transferred to the hot pressing chamber 2. It is considered that the temperature rising time in the hot press chamber 2 is shortened by preheating in 2.

However, in a series of hot press treatments, the proportion of the temperature rise time occupied in the entire treatment time is usually quite large, and the tendency tends to increase especially with hot press at high temperatures. Is getting stronger. In some cases, even in hot pressing at a relatively low temperature, it may be necessary to heat for a long time for the purpose of degreasing, etc., and on the contrary, a cooling time longer than the heating time is required. In some cases. In other words, in a series of treatments, the heating time, hot pressing time, and cooling time often differ greatly, so even if the hot pressing machine has three chambers, a preheating chamber, a hot pressing chamber, and a cooling chamber. However, there was a problem that the processing time in each room was unbalanced and the advantage of having three rooms was not fully utilized.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat treatment furnace capable of shortening the cycle time and improving the production efficiency.

[0014]

[Means for Solving the Problems]

 The continuous heat treatment furnace according to claim 1 is a treatment chamber whose inside can be hermetically sealed, a front chamber which is provided continuously to an inlet of the treatment chamber, and which replaces the inside with the same atmosphere as the treatment chamber, A rear chamber that is connected to the outlet of the processing chamber and replaces the inside with the atmosphere; a first transfer device that transfers the object to be processed from the previous chamber to the processing chamber; A second transfer device for transferring an object to be processed is provided in the rear chamber, and the inside of the processing chamber is divided into a heating zone and a cooling zone to heat the object to be processed carried in from the front chamber. It is characterized in that it is provided with a transfer device that transfers continuously in a line from the zone to the cooling zone.

A continuous heat treatment furnace according to a second aspect is the continuous heat treatment furnace according to the first aspect, wherein the heating zone of the processing chamber is provided with a press device for pressurizing an object to be processed. It is characterized by being. A continuous heat treatment furnace according to claim 3 is the continuous heat treatment furnace according to claim 1 or 2, characterized in that a chain pusher type transfer device is adopted as the transfer device.

A continuous heat treatment furnace according to claim 4 is the continuous heat treatment furnace according to any one of claims 1 to 3, wherein the processing chamber is further divided into a plurality of chambers. It is characterized by a door that can be opened and closed. The continuous heat treatment furnace according to claim 5 is the continuous heat treatment furnace according to any one of claims 1 to 4, wherein the inlet side and the outlet side of the processing chamber have the first transfer device. Alternatively, it is characterized in that a waiting chamber for accommodating an object to be processed, which has been transferred by the transfer device, and waiting it is provided.

[0017]

[Action]

 In the continuous heat treatment furnace according to the first aspect, a large number of objects to be processed are arranged and continuously transferred inside the processing chamber, during which heating and cooling are performed in a desired pattern. Therefore, it is possible to simultaneously heat and cool a large number of objects to be processed.

According to the continuous heat treatment furnace of the second aspect, since the press device is provided in the substantially central portion of the processing chamber, a large number of objects to be processed are continuously transferred. Pressurization is performed in a series of smooth flow processes.

According to the continuous heat treatment furnace of the third aspect, since the chain pusher type is adopted as the transfer device, the heat resistance and durability of the transfer device are improved. Further, the chain pusher type transfer device has a simple structure and is small in size, and accordingly, the entire heat treatment furnace is downsized accordingly.

According to the continuous heat treatment furnace of the fourth aspect, the processing chamber is provided with a door that can be opened and closed so as to further divide the processing chamber into a plurality of chambers. By dividing the zone into multiple chambers, more strict temperature control becomes possible.

According to the continuous heat treatment furnace of the fifth aspect, the processing chamber is provided with a standby chamber on each of the inlet side and the outlet side for temporarily storing the object to be treated and waiting it. Due to the configuration, regardless of the length of time required to replace the atmosphere in the front and rear chambers with the same atmosphere as the processing chamber, the transfer of the workpieces can be performed continuously without interruption. .

[0022]

【Example】

 Hereinafter, an embodiment in which the present invention is applied to a continuous heat treatment furnace having a hot press machine will be described with reference to FIGS. 1 to 11. As shown in FIG. 1, the continuous heat treatment furnace of this embodiment includes a processing chamber 30, a front chamber 31 provided in front of the inlet of the processing chamber 30, and a rear chamber provided behind the outlet of the processing chamber 30. This is a three-chamber type in which the chamber 32 is connected in a straight line, and each of these chambers is partitioned by doors 36 to 39, and the object M is treated in a sealed and independent atmosphere. is there.

The inside of the processing chamber 30 can be maintained in a vacuum, and a heating zone 42 for heating and hot pressing the object M to be processed and an object M to which the hot pressing process has been performed. And a first standby chamber 90 1 and a second standby chamber 90 1 for cooling. On the other hand, the insides of the front chamber 31 and the rear chamber 32 are each replaced with a vacuum. Then, as shown in FIG. 1, the processing object M loaded into the front chamber 31 through the loading door 36 from the external loader 62 disposed in the front stage of the front chamber 31 is transferred to a transfer device and a transfer device (for details, see FIG. 33 to 35, the chambers 31, 30 and 32 are sequentially transferred to the front, and as described later, heating, hot pressing, and cooling are performed, and the processed object M is processed. It is adapted to be taken out from the carry-out door 39 to the external unloader 63 at the rear stage of the rear chamber 32.

The object to be processed M is composed of a plurality of works m, m, ... In a state where the works m, m ... Are placed on the trays 60, 60. It is designed to be transferred in 32. As shown in FIG. 6, each of the works m, m ... is made up of one work m, m .. A total of 4 blocks, that is, a total of 12 works m, m ... Are placed on the right side. Further, as shown in FIG. 4, the works m, m ... Are fitted at their lower ends into the through holes 81 of the trays 60, 60. In addition, these trays 60, 60 ... Are connected two by two by joints 83, 83.

As shown in FIG. 1, the heating zone 42 of the processing chamber 30 is surrounded by a heat insulating wall 40, and is provided with a heater 41 that is controlled to perform heating in a predetermined temperature pattern. Has been. Further, the inside thereof is divided into a plurality of chambers 45 to 50, and the above-mentioned processing is performed in each chamber 45 to 50 in several stages. That is, as indicated by the temperature gradient in the processing chamber 30 at T in FIG. 1, after the temperature is raised from room temperature to 500 degrees in the first temperature rising zone 45, the temperature is soaked to 500 degrees in the first soaking zone 46. Then, the temperature is raised from 500 degrees to 600 degrees in the second temperature raising zone 47, then soaked to 600 degrees in the second soaking zone 48, and then hot-pressed in the hot press zone 49, and then the heat retaining zone. The heat is maintained at 50. In order to perform these heatings, as shown in FIG. 4, upper and lower four sided heaters 58, 58 ... And intermediate heaters 59, 59.

As shown in FIG. 5, the upper press ram 66 provided above and below the hot press strip 49 is suspended from the upper press frame 65, and the upper press ram 66 faces upward with respect to the lower press frame 67. The lower press ram 69 pushed up by the attached press cylinder 68 is provided on each of four axes. As mentioned above, since one tray 60 has a total of twelve works m, m, etc., divided into four blocks, one work block has three works m, m. It is designed to press m ... at the same time. Then, when the press cylinder 68 is actuated and the lower press ram 69 is pushed up while the object M to be processed is transferred to the fixed position of the hot press band 49, it is supported by the through hole 81 by the flange 82. The works m, m ... Are lifted up slightly from the tray 60, and the upper surfaces of the works m, m ... Are pressed against the lower surface of the upper press ram 66. After the pressing is completed, the lower press ram 69 is lowered, the works m, m ... Are lowered onto the tray 60, and then the tray 60 is transferred from the hot press band 49 to the heat retaining belt 50.

As shown in FIG. 1, the cooling zone 44 has a water cooling double wall 43 at its wall portion.

As shown in FIG. 1, the front portion of the front chamber 31, the rear portion of the rear chamber 32, the front chamber 31 and the first standby chamber 90, and the second standby chamber 91 and the rear chamber 32. A loading door 36, an unloading door 39, an intermediate entrance door 37, and an intermediate exit door 38 are provided in each. As shown in FIGS. 3 and 7, these doors 36 to 39 are all airtight doors whose airtightness is maintained by O-rings 85, 85.

Further, as shown in FIG. 1, the front part of the first temperature rising zone 45, between the first temperature rising zone 45 and the first soaking zone 46, the first soaking zone 46 and the second soaking zone 46. 47, between the second heating zone 47 and the second soaking zone 48, between the second soaking zone 48 and the hot press zone 49, between the hot press zone 49 and the warming zone 50, and the warming zone 50. At the rear part, there are respectively a first temperature rising zone entrance door 51, a first temperature-increasing zone entrance door 52, a second temperature-raising zone entrance door 53, a second temperature-zone inlet door 54, a hot press zone entrance door 55, and a guard. A tropical entrance door 56 and a tropical entrance door 57 are provided. These doors 51 to 57 are adiabatic doors that form a part of the adiabatic wall 40.

The airtight doors 36 to 39 and the heat insulating doors 51 to 57 can be opened and closed vertically, and opened and closed by the air cylinders 64, 64, ... It is supposed to be done. As shown in FIG. 5, when the heat insulating doors 51 to 57 are closed, the lower end surfaces thereof are brought into close contact with the upper surfaces of the trays 60, 60 to insulate them. This heat insulation reduces the temperature difference between the works m, m ... Arranged on one tray 60 to improve the heat uniformity.

As shown in FIGS. 3, 5 and 7, the transfer device and the transfer devices 33 to 35 are trays 60, 60 ... The first transfer device 33 is provided at the bottom of the front chamber 31 and is used for transfer from the front chamber 31 to the processing chamber 30. The second transfer device 34 is provided at the bottom of the processing chamber 30 and is used for transfer inside the processing chamber 30, and the transfer device 35 is provided at the bottom of the rear chamber 32 to transfer from the processing chamber 30 to the rear chamber 32. Is being used for. That is, in this continuous heat treatment furnace, the transfer path of the object M to be processed is extended in a straight line in the horizontal direction.

As shown in FIG. 6, the trays 60, 60 on which the objects to be processed M are placed, the front and rear ends of the objects to be processed M in the transfer direction are in close contact with each other, and the hearth roller 61 of each of the belts 45 to 50. , 61 ... are continuously arranged on the top of the tray 60, and the rows of the trays 60, 60. The trays 60, 60 ... The entire row is moved forward from the heating zone 42 to the cooling zone 44 by pushing the portion forward of the workpiece M in the transfer direction. Here, the trays 60, 60 ... Are transferred at a pitch of moving one tray every 4 minutes, for example. Then, the objects to be treated M placed on the trays 60, 60, ... Are sequentially arranged at this speed in the front chamber 31, the first standby chamber 90, the heating zone 42, the cooling zone 44, the second standby chamber 91, and the rear chamber. While the chamber 32 is advancing, the required processing is performed.

As shown in FIGS. 8 and 9, each of the transfer devices and the transport devices 33 to 35 has dog plates 77a to c connected to the tips of the link chains 76, 76, respectively, and further, the dog plates 77a to 77c. ... c are rotatably connected to the pusher tilting 78a-c, and side chains 79, 79 ... Are attached to the side surfaces of the link chains 76, 76 ... And dog plates 77a-c. .. are rotated by a geared motor (not shown) to reciprocate the link chains 76, 76 along the chain guides 80, 80. is there.

On the other hand, the first and second standby chambers 90 and 91 are provided on the inlet side and the outlet side of the processing chamber 30, respectively, and temporarily store the transported object M to be processed and wait it. . That is, when the time required to replace the vacuum in the front chamber and the rear chamber 31, 32 is longer than the constant speed at which the object to be processed M is transported, the supply of the object to be processed M is interrupted. This is for accommodating and waiting the number of objects M to be processed within the vacuum replacement time so as not to end up. In the present embodiment, the movement interval of one pitch of the workpiece M is 4 minutes, and the vacuum replacement time in the front chamber and the rear chambers 31 and 32 is 8 minutes. Therefore, the first and second standby chambers 90 , 91 accommodates two objects to be processed M, respectively.

Next, a method of loading the workpiece M into the front chamber 31 and a method of unloading the workpiece M from the rear chamber 32 will be described with reference to FIGS. 10 and 11. The continuous heat treatment furnace is automatically operated by a control device (not shown) when a switch (not shown) is operated to start the device.

The arrows in FIGS. 10 and 11 indicate the movement paths of the pusher tilts 78 a to c of the transfer device and the transfer devices 33 to 35. As shown in FIG. When 60, 60 ... Are loaded into the front chamber 31, the loading door 36 of the front chamber 31 is opened, and the two trays 60, 60 in the connected state are moved from the position (A) to the front by the external loader 62. It is pushed to the front position (B) of the chamber 31. Then, the pusher tilting 78a of the first transfer device 33 is engaged with the opening 60a formed in the front part of the rear tray 60, so that one tray is separated from the position of (C) in the front chamber 31. The trays 60, 60 are pushed to the fixed position (D). Then, the dog plate 77a is returned to the fixed position (C) behind the front chamber 31.

Next, the front chamber 31 is vacuum-displaced to equalize the pressure with the processing chamber 30, the intermediate inlet door 37 is opened, and the pusher tilting 78a is moved from the position (C) to the rear end surface of the rear tray 60. Abutting on each other, the two trays 60, 60 are moved to the rear position (E) of the first standby chamber 90. That is, the trays 60, 60 are moved by two. Next, the trays 60, 60 are pushed from (F) to (G) by the transfer device 34 of the first standby chamber 90 in the same manner as the above-mentioned movement from (C) to (D). Thereafter, the dog plate 77b is returned to the position (F), and while pushing the rear end portion of the rear tray 60, the trays 60, 60 are conveyed one by one as shown in (H) and (I). .

Next, as shown in FIG. 11, when the processed object M which has been processed is carried out from the second standby chamber 91 to the rear chamber 32, the rear chamber 32 and the processing chamber 30 are equalized in pressure. After that, the intermediate outlet door 38 of the rear chamber 32 is opened, and the pusher tilting 78c is guided to the position indicated by (J) in the second standby chamber 91. Then, after the pusher tilting 78c is engaged with the opening 60a of the rear tray 60 to pull out the trays 60, 60 from (J) to (K), the intermediate outlet door 38 is closed. Then, after the rear chamber 32 is returned to the atmospheric pressure, the carry-out door 39 is opened and the trays 60, 60 are carried out from (K) to (L). After that, the pusher tilting is hooked on the opening 60b of the front tray 60 by the external unloader 63, and the two front and rear trays 60, 60 are carried out from (M) to (N).

In the embodiment having the above-mentioned structure, a large number of objects M to be processed are arranged inside the processing chamber 30 and continuously transferred, and desired heating, hot pressing, and cooling can be performed during that time. The object M to be processed can be processed. Further, the furnace length of each of the heating zone, the hot pressing zone and the cooling zone inside the processing chamber 30 should be set to a length corresponding to the ratio of the time required for each step of heating, hot pressing and cooling the object M to be treated. In this case, the material to be processed M can be transferred at a constant speed without any stagnation, and necessary processing can be performed while the material to be processed M is moving forward in each chamber, thus improving the production efficiency. be able to.

From the above, in the present embodiment, the cycle time can be set to a time interval (4 minutes) in which one tray 60 on which the object M is placed moves, and further, the furnace length of the processing chamber 30 By increasing the number of trays 60, 60 ... Which can be arranged in the processing chamber 30 by increasing the number of trays, the time interval for moving one tray 60, 60. Can be made.

Since the processing chamber 30 is provided with heat-opening doors 51 to 57 that can be opened and closed so as to divide the inside of the processing chamber 30 into a plurality of chambers, a stricter temperature during heating can be obtained. Degree management is possible. Further, since the object M to be processed does not pass through the low temperature atmosphere during the transfer of each chamber, the temperature drop can be prevented.

The processing chamber 30 is provided with first and second standby chambers 90 and 91 on the inlet side and the outlet side thereof, for temporarily storing the transported object M to be processed and waiting it. Therefore, even if it takes a long time to replace the vacuum in the front chamber 31 and the rear chamber 32, the transfer of the object M to be processed is not interrupted and the production efficiency is not lowered. Further, as shown in FIG. 10, a first standby chamber 90 is provided on the inlet side of the processing chamber 30, and the first transfer device and the transfer devices 33 and 34 are arranged in a high temperature atmosphere when the object M to be processed is transferred. Since the transfer device and the transfer device do not get inside, the possibility of failure can be reduced without damage to the transfer device and the transfer device, and heat loss can be prevented.

Further, since the transfer device and the transfer devices 33 to 35 of the present embodiment adopt the chain pusher type, the structure is easy and the size is small. Therefore, the entire device can be downsized accordingly. it can.

Further, the pressing method with the hot press band 49 is a so-called lower pressing method in which the lower press ram 69 is pushed up by the press cylinder 68, and since the object M to be processed is pressed while being raised, the lower press ram 69 is pressed. The pressing effect of both 69 and the upper press ram 66 can be obtained, and the pressing force can be uniformly distributed over the entire object M to be processed.

In this embodiment, since the hot press band 49 is provided with four pressing shafts for the object M to be processed, the production efficiency is increased as compared with the case of a single shaft, but the pressing shafts are further used. A large number may be installed, and doing so has the effect of further improving production efficiency. Further, when it is necessary to perform preliminary pressing or cold pressing, pressing shafts may be provided in the temperature rising zones 45, 47, the soaking zones 46, 48 and the heat retaining zones 50.

Further, in this embodiment, the lower press ram 69 is configured to be pushed up by the press cylinder 68 to perform downward pushing, but in addition to this, the upper press ram 66 is configured to be pushed down by the press cylinder, and the upper press ram 66 is configured to be pushed down. It is also possible to carry out upward pushing by means of both, or both of the lower press ram 69 and the upper press ram 66.

Further, in the present embodiment, the cooling of the cooling zone 44 is naturally performed in the water-cooled double wall 43, but instead of this, in the case where the entire processing chamber 30 is in a gas atmosphere In the cooling zone 44, gas atmosphere cooling is applied, and the cooling time can be shortened. Furthermore, if the cooling gas is forcedly circulated by the circulation fan, rapid cooling in the middle and low temperature range is possible. In this case, the circulation fan can be installed either by an internal fan system that is installed on the side of the furnace body or an external fan system that circulates through the furnace duct.

[0048]

[Effect of device]

 According to the continuous heat treatment furnace of claim 1, a large number of objects to be processed can be continuously transferred in parallel to the inside of the processing chamber, during which heating and cooling processing can be performed in a desired pattern. Therefore, it is possible to simultaneously heat and cool a large number of objects.

According to the continuous heat treatment furnace of the second aspect, since the press device is provided in the heating zone of the processing chamber, a series of circular slides through which the object to be processed is continuously transferred. The pressure treatment can be performed in the course of a simple flow.

According to the continuous heat treatment furnace of the third aspect, since the chain pusher type is adopted as the transfer device, the effect of improving the heat resistance and durability of the transfer device can be obtained. Further, since the chain pusher type transfer device has a simple structure and is small in size, the effect of reducing the size of the entire heat treatment furnace can be obtained.

According to the continuous heat treatment furnace of the fourth aspect, since the processing chamber is provided with a door that can be opened and closed to divide the processing chamber into a plurality of chambers, By dividing the zone into a plurality of chambers, it is possible to achieve the effect of enabling more strict temperature control.

According to the continuous heat treatment furnace of the fifth aspect, the processing chamber is provided with standby chambers at the inlet side and the outlet side thereof for temporarily holding the object to be treated, respectively. Therefore, regardless of the length of time required to replace the atmosphere in the front and rear chambers with the same atmosphere as in the processing chamber, the transfer of the processed material is not interrupted and the production efficiency is improved. be able to.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing a front chamber portion of the embodiment.

FIG. 3 is an enlarged front cross-sectional view of a rear portion in the transfer direction of the object to be processed of the same embodiment.

FIG. 4 is a side sectional view showing a press device portion of the embodiment.

FIG. 5 is an enlarged front cross-sectional view of the central portion in the transfer direction of the object to be processed according to the embodiment.

6 is a view taken along the line AA of FIG.

FIG. 7 is an enlarged front cross-sectional view of a front portion of the object to be processed in the transfer direction of the embodiment.

FIG. 8 is a side view showing a front end portion of the chain pusher type transport device in the embodiment.

FIG. 9 is a front view of the same.

FIG. 10 is a diagram showing an operation procedure of the first and second conveyance devices.

FIG. 11 is a diagram showing an operation procedure of the third transport device.

FIG. 12 is a front sectional view showing an example of a conventional heat treatment furnace.

FIG. 13 is a diagram for explaining a treatment process of a conventional heat treatment furnace.

[Explanation of symbols]

 30 processing chamber 31 front chamber 32 rear chamber 33 first transfer device 34 transfer device 35 second transfer device 42 heating zone 44 cooling zone 49 hot press band (press device) 51 first temperature rising band inlet door (door) 52 1 soaking zone entrance door (door) 53 2nd temperature rising zone entrance door (door) 54 2nd soaking zone entrance door (door) 55 hot press zone entrance door (door) 56 heat preservation tropical entrance door (door) 57 preservation Tropical exit door (door) 90 First waiting room (waiting room) 91 Second waiting room (waiting room) M Object to be processed

Claims (5)

[Scope of utility model registration request] 1. A processing chamber whose inside can be hermetically sealed, a front chamber which is provided continuously to an inlet of the processing chamber, and which replaces the inside with the same atmosphere as the processing chamber, and a continuously connected outlet of the processing chamber. And a first transfer device for transferring an object to be processed from the front chamber to the processing chamber, and an object to be processed from the processing chamber to the rear chamber. A second transfer device for transferring is provided, and the inside of the processing chamber is divided into a heating zone and a cooling zone, and the objects to be processed carried in from the front chamber are arranged in rows from the heating zone to the cooling zone. A continuous heat treatment furnace, which is provided with a transfer device for continuously transferring in a state. 2. The continuous heat treatment furnace according to claim 1, wherein the heating zone of the processing chamber is provided with a press device for pressurizing the object to be processed. Furnace. 3. The continuous heat treatment furnace according to claim 1, wherein the carrier device is a chain pusher type carrier device. 4. The continuous heat treatment furnace according to claim 1, wherein the processing chamber is provided with an openable / closable door for further partitioning the inside of the processing chamber into a plurality of chambers. A continuous heat treatment furnace characterized in that 5. The continuous heat treatment furnace according to any one of claims 1 to 4, wherein the first transfer device or the transfer device transfers the processing chamber to an inlet side and an outlet side thereof, respectively. A continuous heat treatment furnace, which is provided with a standby chamber for temporarily storing an object to be processed and waiting it.