JPH04357376A - Valve device of furnace - Google Patents

Abstract

PURPOSE:To protect a packing effectively with simple constitution by moving vertically a valve body with a lift frame vertically moved and removably sticking packing in a valve device for opening and closing an opening through which an objected to be processed by a vacuum furnace, gas atmospheric furnace, etc., is put in and out. CONSTITUTION:When a lift frame 12 is lowered from a state in which an opening 3 is opened by a valve body 13 lifted together with the lift frame 12, the front face of the lower portion 16a of a packing 16 is covered with a heat shielding cover 17, so that the lower portion 16a protected from high heat in a furnace 1 by the heat shielding cover 17. When the valve body 13 is opposed to the opening 3 as it is lowered, a guide piece 25 abuts against a stopper 19 to stop the lowering of the valve body 13, while the heat shielding cover 17 is continuously lowered, so that the lower portion 16a of the packing is exposed to the upper side of the heat shielding cover 17. Then, the valve body 13, along with the following lowering of the lift frame 12, is shifted to close the opening by the guide piece 25 which moves the upper inlined part 23 of a guide groove 22 so that the packing 16 is pressed against a valve seat 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device installed in an opening for loading and unloading a workpiece in a vacuum furnace, gas atmosphere furnace, or the like.

0002

2. Description of the Related Art As shown in FIG. 4, a valve body 13f is connected to an elevating frame 12f that is vertically movable along an opening 3f on the side of a furnace 1f through a connection mechanism consisting of a plurality of parallel links 14f. connected. The valve body 13f is constructed by attaching a packing 16f to the front surface of a main body 15f. Valve body 1
The valve body 13f is located below the vertical movement path of the opening 3f.
A stopper 19f is provided at a position opposite to f to catch the downward movement.

In the valve device having such a structure, when the lifting frame 12f descends, the valve body 13f first descends together with it, and then when the lowering is stopped by the stopper 19f, the lifting frame 12f stops descending. The force acts as a force pushing the valve body 13f in the horizontal direction toward the opening 3f via the parallel link 14f, and the packing 16f is brought into close contact around the opening 3f. When the opening 3f is opened, the lifting frame 12f is raised to perform an operation opposite to the above.

0004

[Problems to be Solved by the Invention] In this conventional furnace valve device, when the valve body 13f is lowered or raised, the lower portion 16af of the packing 16f passes in front of the opening 3f, which causes high heat in the furnace. There is a problem with it being damaged by exposure to. In order to prevent damage, the lower part 1 of the packing 16f is
When the front surface of 6af is covered with a heat shielding cover, the cover becomes a hindrance to the packing 16f coming into close contact with the periphery of the opening 3f. For this reason, a separate mechanism is required to position the heat shield cover in front of the packing 16f and evacuate it from there in conjunction with the vertical movement of the valve body 13f, which complicates the configuration of the valve device. There was a problem.

The present invention has been made to solve the problems (technical problems) of the prior art described above, and has a mechanism in which the vertical movement of the valve body and the close contact and separation of the packing are performed by the vertical movement of the lifting frame. The purpose of the present invention is to provide a furnace valve device with a simple configuration, which is capable of covering the front side of the packing with a heat shield cover and removing it in conjunction with each other, and is equipped with a structure for protecting the packing. There is.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the furnace valve device of the present invention includes a lifting frame that can move up and down along an opening on the side of the furnace, and a connecting mechanism to the lifting frame. It consists of a valve body for closing the opening connected through the body, and a stopper for catching the downward movement of the valve body at a position where the valve body faces the opening. In a furnace valve device comprising a packing for contacting around the opening, which is attached to the front surface facing the opening, the lower part of the packing of the valve body is located at the lower part of the lifting frame. A heat insulating cover is attached to the front of the furnace, and the connecting mechanism has a position where the heat insulating cover protects the packing from radiant heat from inside the furnace and the opening is closed as the elevating frame moves up and down. Sometimes it is equipped with a guide groove for moving it to a position where it will not become an obstruction.

[0007]

[Operation] When the elevating frame descends, the valve body first descends in front of the opening with the front surface of the packing covered by the heat shielding cover. Next, when the lowering of the valve body is stopped by the stopper, the heat shield cover, which descends together with the elevating frame, retreats from the front surface of the packing. Next, the valve body is advanced toward the opening by the upper portion of the guide groove, and the packing is brought into close contact with the periphery of the opening.

[0008]

Embodiments Below, drawings showing embodiments of the present application will be explained. FIG. 1 shows a structure around a gate valve device in a continuous vacuum furnace as an example of a furnace valve device. An example of such a vacuum furnace is a roller hearth vacuum furnace. In the figure, 1 is a furnace, for example a heating furnace. Furnaces with other heat treatment functions may also be used. Reference numeral 3 denotes an opening provided on the side surface of the furnace 1, through which the object to be treated passes, and is formed, for example, in a rectangular shape. Reference numeral 5 indicates a valve seat that includes a portion around the opening 3. Reference numeral 6 indicates a well-known heat insulating wall provided within the furnace 1.

Next, reference numeral 8 indicates a gate valve device. Reference numeral 9 denotes a valve box in the gate valve device 8, which is connected to the furnace 1, and its inner space is sealed from the outside. Reference numeral 12 indicates an elevating frame provided within the valve box 9. Although not shown, the elevating frame 12 is guided vertically parallel to the surface direction of the opening 3 by a guide member attached to the valve box 9, and is moved up and down by a drive device not shown. It is now possible to do so. Reference numeral 13 denotes a valve body for closing the opening 3, which is formed in a rectangular shape corresponding to the opening 3, and is connected to the connecting mechanism 1.
It is connected to the elevating frame 12 via 4. The valve body 13
It is composed of a main body 15 and a packing 16 attached to the front surface of the main body 15 for contacting the valve seat 5 around the opening 3. 17 is the lower part 16 of the packing 16
A heat insulating cover is shown for covering the front surface of the frame 12, and is attached to the lower part of the elevating frame 12 using a connecting piece 18. The lower part of the packing mentioned above refers to the part that passes in front of the opening 3 of the furnace 1 and is exposed to the high heat inside the furnace 1 when the valve body 13 moves up and down. For example, in the case of the packing 16 which is rectangular as in this example, the term refers to the lower side of the packing 16. In the case of a circular packing, this is the range determined by the relationship between the diameter of the packing and the diameter of the opening 3 in the lower half of the packing. Reference numeral 19 denotes a stopper for stopping the lowering of the valve body 13 at a position where the valve body 13 faces the opening 3, and is attached to the valve box 9.

Next, the connection mechanism 14 will be explained. Support plates 21 and 21 are attached to the lifting frame 12, and in this example, they are formed integrally with the lifting frame 12, and are located on the left and right sides of the main body 15 of the valve body 13 as shown in (B). Reference numeral 22 denotes a vertically long guide groove formed in each support plate 21, and as the elevating frame 12 moves up and down, the heat shield cover 17 moves into the packing 16 as shown in FIG.
Location to protect against radiant heat from inside the furnace and Figures 2 and 3
When the opening 3 is closed, the opening 3 is moved to a position where it will not become an obstruction. The guide groove 22 is composed of an upper portion 23 that slopes toward the front (the right side of the opening 3 in (A)) and a lower portion 24 extending in the vertical direction below the upper portion 23 . Guide pieces 25 and 25 are attached to the left and right sides of the main body 15 of the valve body 13, and are positioned in the guide grooves 22 and 22 of the left and right support plates 21 and 21, respectively. The guide piece 25 is constructed with a roller so that it can move smoothly within the guide groove 22. Said guide groove 22
When the guide piece 25 is located in the upper part 23 of the guide groove 22 as shown in FIGS. 2(A) and 3(A), the length of
As shown in (B) of each figure, the lower part 16a of the packing 16 is exposed above the heat shield cover 17, and the guide piece 25 is exposed in the lower part of the guide groove 22 as shown in (A) of FIG. 24, the lower portion 16a of the packing 16 is of such length that it is hidden behind the heat shield cover 17, as shown in FIG. 24(B). Furthermore, guide groove 2
In addition to being straight in the vertical direction, the lower part 24 of No. 2 may be inclined in the same way as the upper part 23 or at a smaller slope than that of the upper part 23.

[0011] Opening and closing of the opening 3 will be explained. The valve body 13 rises together with the elevating frame 12, and the elevating frame 12 descends from the state where the opening 3 is open as shown in FIG. 1(A). During this process, the guide piece 25 is located at the lower end of the guide groove 22, and the front surface of the lower portion 16a of the packing 16 is covered by the heat shield cover 17. Therefore, even if the lower part 16a descends past the opening 3, the furnace 1
The heat shield cover 17 prevents the high heat inside from reaching the lower part 16a.
occluded by

The lifting frame 12 is further lowered and the valve body 13 is moved downward as shown in FIG.
When facing the opening 3 as shown in FIG. 2A, the guide piece 25 comes into contact with the stopper 19 as shown in FIG. 2B. Therefore, the valve body 13 is received by the stopper 19 and its downward movement is stopped. If the elevator frame 12 continues to descend thereafter, the heat shield cover 1
7 also descends together, and when the guide piece 25 reaches the lower end of the upper part 23 of the guide groove 22 as shown in FIG. 2(A), the lower part 1 of the packing 16 as shown in FIG.
6a is exposed above the heat shield cover 17.

When the elevating frame 12 continues to descend and the guide piece 25 moves within the upper portion 23 of the guide groove 22, the downward force of the elevating frame 12 is applied to the valve body 1 via the upper portion 23.
Acts as a force pushing 3 forward. Therefore, the valve body 13 moves forward toward the opening 3 and closes the opening 3 as shown in FIG. 3A, and the packing 16 is pressed against the valve seat 5 to seal the opening 3.

The stopper 19 for catching the lowering of the valve body 13 may be adapted to catch the main body 15 of the valve body 13. In that case, it is advisable to take measures to prevent interference with the stopper 19, such as by cutting off a portion of the connecting piece 18.

[0015] When opening the opening 3, the lifting frame 12
3, the valve body 13 moves in the opposite direction to that in the above case, and the opening 3 is opened.

The heat treatment in the furnace having the above configuration is as follows. With the opening 3 closed by the valve body 13, the furnace 1
Heat treatment of the object to be treated is performed within the chamber. After the heat treatment is completed, the valve body 13 is raised to open the opening 3 and the furnace 1
The object to be processed inside is transferred to the next stage through the opening 3. When the above transfer is completed, the valve body 13 again opens the opening 3.
is closed, and the next workpiece is heat-treated in the furnace 1.

[0017]

As described above, in the present invention, the connection mechanism between the lift frame 12 and the valve body 13 is attached to the valve body 13 in the guide groove 22 of the support plate 21 attached to the lift frame 12. Because of the structure in which the guide piece 25 is positioned, when the opening 3 of the furnace 1 is closed by the valve body 13, the lowering of the lifting frame 12
First, the valve body 13 descends in front of the opening 3 with the front surface of the lower part 16a of the packing covered with the heat shield cover 17, and then, when the downward movement of the valve body 13 is stopped by the stopper 19, it descends together with the lifting frame 12. The heat shielding cover 17 is retracted from the front surface of the lower part 16a of the packing, and then the valve body 13 is advanced toward the opening 3 by the upper part 23 of the guide groove 22, and the packing 16 is brought into close contact with the periphery of the opening 3. There are features that can be used. On the other hand, when the opening 3 is opened, the raising and lowering frame 12 has the feature that the completely opposite effect to the above is performed. That is, by the vertical movement of the lifting frame 12, the valve body 13 moves up and down, and the packing 16 comes into close contact with and separates from the mechanism, which is used to cover and remove the front surface of the packing 16 with the heat shield cover 17. There are features that can be used to This has a great effect in simplifying the configuration of the furnace valve device, which is provided with a structure for protecting the packing 16.

[Brief explanation of drawings]

FIG. 1 (A) is a longitudinal cross-sectional view showing the structure near the valve device of the furnace, showing a state in which the valve body is in the middle of being raised and lowered, and (B) is a cross-sectional view taken along the line BB in (A).

FIGS. 2A and 2B are views similar to FIGS. 1A and 1B, showing a state in which the valve body is located at the lower end.

3A and 3B are views similar to FIGS. 1A and 1B, showing a state in which the packing of the valve body is in close contact with the valve seat of the furnace.

FIG. 4 is a longitudinal sectional view showing the structure of a conventional furnace valve device.

[Explanation of symbols]

3 Opening 12 Lifting frame 13 Valve body 14 Connection mechanism 16 Packing 17 Heat shield cover 22 Guide groove 25 Guide piece

Claims (2)

[Claims] 1. A lifting frame that is movable up and down along an opening on a side of the furnace, a valve body for closing the opening connected to the lifting frame via a connecting mechanism, and a valve that prevents the lowering of the valve body. The valve body includes a stopper for receiving the body at a position facing the opening, and the valve body includes a stopper for abutting around the opening, which is attached to the front face of the body opposite to the opening. In the furnace valve device comprising a packing, a heat insulating cover is attached to the lower part of the lifting frame to be positioned in front of the lower part of the packing of the valve body, while the connecting mechanism includes: As the lifting frame moves up and down, the heat shield cover is equipped with a guide groove to move the packing to a position that protects it from radiant heat from inside the furnace, and to a position where it does not become an obstruction when the opening is closed. Features a furnace valve device. 2. The coupling mechanism includes left and right support plates, which are attached to the lifting frame and located on the left and right sides of the main body of the valve body, and each of which has a vertically elongated guide groove formed therein; It is composed of left and right guide pieces attached to the left and right sides and located in the respective guide grooves of the left and right support plates, and the length of the guide groove is such that the guide pieces are located in the upper part of the guide groove. In this state, the lower part of the packing is exposed at a position above the heat shielding cover, and in the state where the guide piece is located at the lower end of the guide groove, the lower part of the packing is hidden behind the heat shielding cover. 2. The furnace valve device according to claim 1, wherein the guide groove has an upper portion inclined forward.