JPS6333952Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an intermediate door device for partitioning two or more chambers in a vacuum furnace for metal heat treatment.

As shown in FIG. 1, a conventional intermediate door device of this type has a configuration in which a heating chamber b is provided in a furnace body a, and the object to be heat-treated is heat-treated in the heating chamber b. A heat-resistant door (heat-insulating door) c to be opened and closed is connected via a link f to an opening/closing bar e that is raised and lowered by a cylinder d, and the furnace body a
Vacuum seal door g that separates the interior from other rooms
is connected via a link j to an opening/closing bar i that is raised and lowered by a cylinder h, and the heat-resistant door c and the vacuum seal door g are opened and closed independently by separate cylinders d and h, and the vacuum seal door g is sealed by interposing a sealing rubber l to the receiving seat k of the furnace body a.

However, in this conventional method, the insulation door and the vacuum seal door are independent and open and close separately, so the mechanism is complex, a lot of space is required, and the size of the intermediate door becomes large. The disadvantage is that the overall length of the furnace is also longer. Furthermore, when the vacuum seal door g is opened, the seal rubber l is exposed and is damaged by radiant heat from the adjacent heating chamber, requiring frequent replacement of the seal rubber.

The present invention aims to eliminate such drawbacks and to extend the life of the seal rubber with a simple structure.It has two or more heat treatment chambers, and a vacuum seal door is installed between the chambers. In a vacuum furnace having an intermediate door consisting of a door, a heat shielding plate divided into a plurality of parts is movable separately from each other so as to heat-shield the entire surface of the seal rubber for the vacuum sealing door, and The present invention is characterized in that the opening/closing and the movement and retraction of each of the heat shielding plates to the front surface of the seal rubber are linked.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a diagram showing one embodiment of the present invention, and shows the entire structure adopted as an intermediate door of a two-chamber vacuum furnace.
That is, a heating chamber 2 formed by having a high-temperature refractory 3 in a vacuum container 1, a gas fan cooling chamber 4 equipped with a fan 5, and a two-chamber gas fan partitioned by an intermediate door portion 6 between both chambers 2 and 4. In a cooling vacuum furnace, a vacuum seal is used to seal the vacuum container 1 by bringing a heat-resistant door 7 that opens and closes one end of the high-temperature refractory 3 of the heating chamber 2 into contact with a receiving seat 8 that is integrated with the vacuum container 1. The vacuum seal door 9 is connected to a vertical opening/closing bar 11 connected to the door 9 and raised and lowered by a cylinder 10 via an opening/closing link 12, and the vacuum seal door 9 and the heat-resistant door 7 are opened by operating the cylinder 10.
This constitutes an intermediate door portion 6 which can be opened and closed at the same time.

The intermediate door portion 6 configured as described above can also be employed as an intermediate door portion of a continuous vacuum furnace having a front heating chamber 2a and a rear heating chamber 2b in the vacuum vessel 1 as shown in FIG.

The intermediate door device of the present invention is characterized in that, in the above configuration, the seal rubber 13 attached to the receiving seat 8 integrated with the vacuum container 1 is designed to shield heat when the doors 7 and 9 are opened.

That is, as shown in FIGS. 4 to 6, a seal rubber 13 is fitted into a groove formed along the opening of the receiving seat 8, and the front surface of the seal rubber 13 is inserted into the groove when the vacuum seal door 9 is opened. The heat shielding plate for covering is divided into several parts (in the example, it is divided into three parts) 14a, 14
b, 14c, and left and right L-shaped heat shielding plates 14
a and 14b are opened and closed diagonally up and down in parallel with the receiving seat 8 by cylinders 17 and 18 along diagonally arranged guides 15 and 16, and the lower heat shield plate 14c is opened and closed by an appropriate lever device or the like. The cylinder 10 (second and third
When the opening/closing bar 11 is raised and the vacuum seal door 9 is opened via the link 12, the cylinders 17 and 18 are simultaneously extended or a lever device or the like is actuated, and the vacuum seal door 9 is also extended. When the operation to close the heat shield plate 1 starts, the heat shield plate 1 is automatically closed.
4a, 14b, and 14c are interlocked by being electrically connected so that they are retracted from the front surface of the seal rubber 13. 19 is an object to be heat treated.

With the above configuration, the heat-resistant door 7 and the vacuum seal door 9 in FIGS. The seal rubber 13 for the vacuum seal door performs a vacuum seal when the vacuum seal door 9 is closed as shown in FIG.

When the heat-treated object 19 is heat-treated, the doors 7 and 9
However, in the present invention, both doors 7 and 9 are opened at the same time with one opening/closing bar 11, so the opening/closing bar 11
Since only one cylinder 10 is required, the width of the intermediate door portion 6 can be made narrower than in the conventional system, and the overall length of the furnace can also be shortened.

When the cylinder 10 starts to raise the opening/closing bar 11, the heat shielding plate 14, which had been evacuated until now,
An operation command is given to the moving cylinders 17 and 18 of a and 14b and the operating lever device of the heat shield plate 14c, and each heat shield plate 14 is opened in parallel with the opening operation of the doors 7 and 9.
a, 14b, and 14c are moved toward the seal rubber 13. The heat shield plates 14a and 14b are connected to the guide 15,
The heat shield plate 14c is moved obliquely along the line 16 and brought into alignment as shown in FIG. As a result, when the vacuum seal door 9 and the heat-resistant door 7 are opened, the heat can be shielded from the radiant heat from the high-temperature parts of the adjacent heating chamber, the heated inner wall of the heat-resistant door 7, and the object to be heat-treated, and the seal rubber 13 can be protected. can.

Note that the heat shield plates 14a and 14b are connected to the cylinder 17,
Although the heat shield plates 14a, 14b, 14 are moved by the heat shield plates 14a, 14b, 14 in electrical connection with the opening operation of the doors 7, 9, it is optional to use other means.
In addition to operating c, it is also possible to make them mechanically interlock. Further, the division of the heat shield plate may be other than three. Further, in the above embodiment, the seal rubber 13 is attached to the receiving seat 8, but it is also possible to attach the seal rubber 13 to the vacuum seal door 9. In this case, it is sufficient to cover the lower portion of the seal rubber with the shielding plate 14 when the vacuum seal door 9 is opened, but it is also possible to cover the entire front surface of the seal rubber. This heat shield plate can be moved in conjunction with the opening and closing of the door 9.

As described above, according to the device of the present invention, the heat shield plate is divided into multiple parts and is movable separately, and is linked to the opening and closing of the vacuum seal door, etc., so that the entire surface of the vacuum seal rubber exposed to high temperatures can be protected. As a result, the life of the expensive seal rubber can be extended, thereby eliminating the need to replace the seal rubber, and improving the efficiency of maintenance and equipment operation.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the intermediate door of a conventional vacuum furnace.
Fig. 2 is a sectional view of a two-chamber vacuum furnace employing the device of the present invention, and Fig. 3 is a sectional view of a continuous vacuum furnace.
Figure 4 is an enlarged view of part A in Figures 2 and 3, Figure 5 is a sectional view showing the state of protection of the seal rubber when the door is opened, and Figure 6 is a view taken in the direction of arrow B in Figure 5. . 1... Vacuum container, 2... Heating chamber, 7... Heat resistant door, 9... Vacuum seal door, 10... Cylinder, 1
1... Opening/closing bar, 13... Seal rubber, 14
a, 14b, 14c...heat shielding plate, 15, 16...
...Guide, 17,18...Cylinder.

Claims (1)

[Scope of utility model registration request] In a vacuum furnace having two or more heat treatment chambers and an intermediate door consisting of a vacuum seal door and a heat-resistant door between the chambers, the entire surface of the seal rubber for the vacuum seal door is divided into multiple parts so as to be able to shield heat. An intermediate for a vacuum furnace, characterized in that the heat shield plates are movable separately from each other, and the opening and closing of the vacuum seal door and the heat-resistant door are linked with the movement and retreat of each of the heat shield plates to the front surface of the seal rubber. door device.