JPH0638312Y2 - Door device for continuous vacuum furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a door device used in a continuous vacuum furnace.

[Conventional technology]

Generally, in a continuous vacuum furnace, two heating chambers (heating spaces) surrounded by a heat insulating material are provided in series in the same vacuum chamber, and the heating object is heated at different furnace temperatures in each heating chamber. Most of them are structured. FIG. 3 shows an example of a conventional furnace of this kind. The furnace body 1 is divided into a front chamber 4, a vacuum chamber 5 and a cooling chamber 6 by partition walls 2 and 3, and the inside of the vacuum chamber 5 is thermally insulated. Two heating chambers 8 and 9 surrounded by a wall 7 are provided,
A similar heating chamber 10 is also provided in the front chamber 4. Door 11a at the exit of heating chamber 10, door 11b at the entrance of heating chamber 8, heating chamber 8
The exit door 11c, the entrance door 11d of the heating chamber 9, and the exit door 11e of the heating chamber 9 are opened and closed by an opening / closing device 12, respectively. The opening / closing device 12 connects each door 11 (generic name of the doors 11a to 11e) via a parallel link 14 to a frame body 13 which is vertically guided by a guide (not shown) fixed to the furnace body 1,
The frame 13 is moved up and down by a piston rod of an air cylinder 15 attached to the top of the furnace. After the lower end of the door 11 comes into contact with the stopper (not shown), the frame 13 is further lowered to press the doors 11 against the end walls of the heating chambers 8 to 10 to close the openings and to close the frame 13. Door if pulled up
11 is detached from each opening and drawn to the frame 13 side, and is then lifted upward while being suspended from the frame 13. Reference numeral 16 is a hearth roller, 17 is an object to be transferred by the hearth roller, and 18 is a heating device including an electric heater.

[Problems to be solved by the device]

In the continuous vacuum furnace 19 having the above structure, since the heating chambers 8 and 9 are in the same vacuum chamber 5, the doors 11c and 11d between the heating chambers are different from the other doors in that one side is exposed to atmospheric pressure on the other side. No vacuum pressure is applied to the heating chambers 8 and 9 and the airtightness between the doors 11c and 11d and the heating chambers 8 and 9 is not required.
It suffices if the opening is closed to such an extent that the radiation loss from 9 and the thermal interference between both heating chambers can be kept small, but since a complicated switchgear 12 was used like other doors, There were problems such as high equipment costs and long reactor length.

The present invention solves the above-mentioned conventional problems, and aims to provide a door device for a continuous vacuum furnace which has a simple structure and saves space.

[Means for Solving the Problems]

However, the door device of the continuous vacuum furnace of the present invention has a plurality of heating chambers surrounded by a heat insulating wall and having a heating device therein.
In a continuous vacuum furnace installed side by side in the same vacuum chamber, a partition door having a tapered cross section that becomes thinner toward the bottom is arranged between the openings of both adjacent heating chambers so that it can be raised and lowered. An elevating drive device for elevating and lowering is provided, and a collar portion having an inclined surface corresponding to the tapered inclined surface of the partition door on the front surface is provided around each of the opening portions, and the collar portion between the heating chambers is provided. The feature is that the partition door is inserted and removed.

In the door device of the present invention, it is preferable that the door reaching the descending end and the front surface of the collar portion are in contact with each other, but they may not necessarily be in contact with each other, and the amount of heat dissipation from the heating chamber to the outside is not necessarily required. There may be a clearance (for example, about several mm) between the partition door and the front surface of the brim so that the amount of space is suppressed to a small amount.

[Action]

In the door device of the present invention, the partition door driven downward by the elevating drive device is inserted between the openings of the adjacent heating chambers and fitted between the flanges of the heating chambers so that the space between the opening portions is closed. Since the heating is interrupted, the vacuum heating process at different heating temperatures can be performed in each heating chamber with almost no thermal interference from other heating chambers. If the partition door is raised by the lifting drive device, the openings will be in communication with each other, and the object to be processed can pass through. Since the partition door is wedged between the collars, it is prevented from contacting each other during the descending and ascending strokes to cause wear or damage, and at the descending end the front surface of the partition and the collar. The gap between and can be made small.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, those parts which are the same as or correspond to those in FIG. 3 are designated by the same reference numerals, and a detailed description thereof will be omitted. 21 is a partition door,
A heat insulating material 23 made of carbon fiber is provided on both surfaces of a core plate 22 made of a heat-resistant metal, which has a tapered longitudinal section that becomes thinner toward the lower side.
Are laminated to form a wedge plate. The partition door 21 includes an opening 24 that is an outlet of the heating chamber 8 and the heating chamber 9.
The rollers 27, which are arranged between the openings 25 which are the entrances of the two, and which are pivotally attached to the shafts 26 projecting from both side end surfaces thereof, are engaged with the vertically extending guide rails 28 fixed to the furnace body 1. Therefore, the partition door 21 is supported by the furnace body 1 so as to be able to move up and down. Reference numeral 29 is a lifting drive device composed of an air cylinder attached to the top of the furnace body, and its piston rod is connected to the partition door 21. On the other hand, on all four sides of the openings 24 and 25, the partition door 21
Frame-shaped brim portions 31 and 32 projecting toward the front are provided, and the front surfaces 31a and 32a of the brim portions 31 and 32 are provided with the partition door 21.
Forming an inclined surface corresponding to both inclined surfaces.

In the continuous vacuum furnace 33 having the above structure, the heating chamber of the front chamber 4
The object to be treated 17 which has been subjected to heat treatment such as preheating or dewaxing in 10 is sequentially heated in a vacuum state in the heating chambers 8 and 9, and then cooled in the cooling chamber 6. At this time, the doors 11b and 11e and the partition door 21 are closed in a state in which the objects to be treated 17 are loaded in the heating chambers 8 and 9, respectively, and the insides of the heating chambers 8 and 9 are maintained in a vacuum state. Although the heating process is performed at different heating temperatures, the lifting drive device 29
The partition door 21 further lowered from the state shown in the figure to the fully closed state indicated by the chain line 34 in FIG.
Cut off between 25 and 25. As a result, mutual thermal interference between the heating chambers 8 and 9 is prevented, and the vacuum heating processing at different heating temperatures can be performed in the heating chambers 8 and 9 without any trouble. Further, since the clearance between the partition door 21 and the flange portions 31 and 32 (the front surfaces 31a and 32a thereof) is small, the heat loss from the heating chamber 8.9 to the outside can be suppressed to a small amount.

If a soft insulating material is used as the heat insulating material 23, and if both edge portions of the partition door 21 are pressed against the front surfaces 31a, 32a of the brim portions 31, 32 when the partition door 21 descends, heat insulation is further improved. It is improved and preferable. In addition, an elastic member such as a spring is interposed between the support portion of the roller 27 for the partition door 21 and the support portion of the guide rail 28 for the furnace body 1, or a play that allows the partition door 21 to move a small amount in the front-rear direction. A mechanism may be provided to reduce the clearance between the partition door 21 and the flange portions 31 and 32 when the door is lowered.

The present invention is not limited to the above embodiment, and for example, the specific structure of the partition door, its guide mechanism, the lifting drive device, etc., and the overall structure of the vacuum furnace may be other than those described above.

[Effects of the Invention] As described above, according to the present invention, a door device for opening and closing adjacent openings of heating chambers arranged side by side in the same vacuum chamber has a simple structure and can be manufactured at a low cost. A useful door device is provided that does not take up space.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a continuous vacuum furnace showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is an example of a conventional continuous vacuum furnace. It is a figure equivalent to FIG. 1 which shows. 1 ... Furnace body, 2 ... Partition wall, 3 ... Partition wall, 5 ... Vacuum chamber, 7 ...
Insulation wall, 8 ... Heating chamber, 9 ... Heating chamber, 16 ... Hearth roller,
17 ... Object to be treated, 18 ... Heating device, 21 ... Partition door, 24 ... Opening part, 25 ... Opening part, 26 ... Shaft, 27 ... Roller, 28 ... Guide rail, 29 ... Lifting drive device, 31, 32 ... Collar Part, 31a, 32a ... Front, 33 ... Continuous vacuum furnace.

Claims (1)

[Scope of utility model registration request] 1. A continuous vacuum furnace in which a plurality of heating chambers surrounded by a heat insulating wall and having a heating device inside are arranged side by side in the same vacuum chamber, and a partition having a tapered cross section that becomes thinner toward the lower side. A door is arranged between the openings of adjacent heating chambers so as to be able to move up and down, and an elevating and lowering drive device for elevating and driving the partition door is provided, and a tapered inclined surface of the partition door is provided around each of the openings. 2. A door device for a continuous vacuum furnace, characterized in that a brim portion having an inclined surface corresponding to the above is provided, and the partition door is fitted into and removed from the brim portions of both heating chambers.