JP2961957B2 - Method of opening valve body in furnace and valve device of furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of opening a valve provided in an opening for taking in and out an object to be processed in a furnace such as a vacuum furnace or a gas atmosphere furnace, and a method for opening a valve in the opening. The present invention relates to a valve device provided for opening and closing.

[0002]

2. Description of the Related Art As shown in FIG. 6, an opening 3d of a furnace 1d is provided.
Is closed via a plurality of link arms 83 to a lifting frame 82 that is raised and lowered by a lifting cylinder 81. The valve body 13d is composed of a main body 15d and a packing 16d provided around the opening-facing surface of the main body.

In such a structure, when opening the opening 3d after the heat treatment in the furnace 1d, first, the valve element
13d is separated from the side of furnace 1d. That is, when the lifting frame 82 is raised, the pressing of the valve 13d against the side of the furnace by the link arm 83 is released, and the valve 13d is separated from the side of the furnace. As a result, the packing 16d moves away from the periphery of the opening 3d. When the lifting frame 82 is further raised, the valve 13d is also raised, and the furnace opening 3d is opened.

[0004]

In this conventional furnace valve device, when the valve 13d rises as described above, the packing 16
Since d passes in front of the opening 3d, it is exposed to high heat radiation from inside the furnace and is damaged, resulting in a problem that its life is shortened. For this reason, there has been a problem that an extremely troublesome work of frequently removing the valve body 13d from the valve box 9d together with the lifting frame 82 and replacing the packing 16d in the valve body 13d has been a problem.

The present invention has been made to solve the above-mentioned problems (technical problems) of the prior art, and it is intended to prevent damage to a packing caused by high heat radiation, extend the life of the packing, and increase the replacement work. It is an object of the present invention to provide a method for opening a valve element in a furnace and a valve device for the furnace, which can be reduced in width.

[0006]

In order to achieve the above object, a method of opening a valve body in a furnace according to the present invention is a method in which a packing of a valve body is applied in close contact with a periphery of an opening on a side surface of the furnace. The valve body is separated from the side of the furnace so that the packing is separated from the periphery of the opening,
Next, in a method of opening a valve body in a furnace that raises the valve body to open the opening, a heat shield plate large enough to shield heat between the packing and the opening is provided. In preparation for opening the opening, the valve body is separated from the side surface of the furnace, and then the heat shield is positioned between the furnace and the valve body to remove the packing. The valve body and the heat shield are raised together with the heat shield being shielded by the heat shield and then interposed between the opening and the packing.

[0007]

When opening the opening of the furnace, the valve body is first separated from the side of the furnace. Next, a heat shield plate is positioned against the front surface of the valve body. Next, the valve body and the heat shield are raised together. During the ascent process, high heat radiation from inside the furnace through the furnace opening is blocked by the heat shield, and the packing is protected from the high heat radiation.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a structure near a gate valve device in a continuous vacuum furnace as an example of a valve device of a furnace. Such a vacuum furnace is, for example, a roller hearth vacuum furnace. In the figure, reference numeral 1 denotes a furnace, for example, a heating furnace. There may be a furnace having another heat treatment function. Reference numeral 3 denotes an opening provided on a side surface of the furnace 1 for passing an object to be processed, and is formed, for example, in a rectangular shape. Reference numeral 5 denotes a valve seat having a portion around the opening 3. Reference numeral 6 denotes a well-known heat insulating wall provided in the furnace 1. Reference numeral 7 denotes another furnace provided in cascade with respect to the furnace 1, and reference numeral 7a denotes an opening on the side surface thereof, which faces the opening 3 of the furnace 1.

Next, reference numeral 8 denotes a furnace 1 as an example of a furnace valve device.
7 shows a sluice valve device for partitioning the space between the seven halves. 9 is a gate valve device 8
Is connected to the furnace 1 and the furnace 7, and the inner space thereof is sealed from the outside. 10 is the valve box 8
It is an inspection port provided at the upper part of, and is always closed by the lid 11. Reference numeral 13 denotes a vertically movable valve body for closing the opening 3, which is formed in a rectangular shape corresponding to the opening 3. The valve body 13 is provided with a packing 16 for abutting on the valve seat 5 provided around a surface of the main body 15 facing the opening 3 in the main body 15.
It is composed of This packing 16 is used for the opening 3
The front shape is provided in a rectangular state corresponding to the front shape. Reference numeral 17 denotes a vertically movable heat shield plate for shielding the packing 16 from heat, and is formed large enough to shield the heat between the packing 16 and the opening 3. In the present embodiment, as shown in FIG. 2, it is formed in a rectangular frame shape so that it can be located between the packing 16 and the opening 3 in the rectangular state. However, the heat shield plate 17 may have a plate shape in which the central portion is not removed. Numeral 18 denotes a vertically movable heat insulating door for closing the opening 7a of the furnace 7.

Next, reference numeral 21 denotes a lifting device. This lifting device 21
Is the valve body lifting mechanism 22, the heat shield plate lifting mechanism 23, and the heat insulating door lifting mechanism
24. These will be described with reference to FIG. First, the valve body lifting mechanism 22 will be described. Reference numeral 27 denotes a hoisting shaft, which is provided at a position slightly above the ascending position so as not to hinder the vertical movement of the valve body 13, the heat shield plate 17, and the heat insulating door 18. It is rotatably supported by 28. Reference numeral 29 denotes a ring for winding the valve body, which can be hoisted without slipping on the cord, for example, a chain sprocket, and is mounted on the hoisting shaft 27 so as to be relatively rotatable. Reference numeral 30 denotes a clutch interposed between the hoisting shaft 27 and the wheel body 29, for example, an electromagnetic clutch is used. Reference numeral 31 denotes a cord, for example, a chain, the upper end of which is connected to the ring body 29 and the lower end of which is connected to the main body 15 of the valve body 13, respectively. Above ring
The connection of the cable body 31 to the cable body 29 is such that the cable body 31 is hung on the front and rear sides of the ring body 29, and the end opposite to the side connected to the valve body 13 is hung downward. Alternatively, the end opposite to the side connected to the valve body 13 may be mechanically fastened to the ring body 29, and the cable body 31 May be wound sequentially. In the latter case, the loop body 29 may be a pulley having a smooth peripheral surface, and the rope body 31 may be a wire. In any case, the upper end of the cord 31 is connected to the ring 29. Although not shown, the wheel body 29 is provided with a stopper for stopping its rotation at a certain angle and stopping the lowering of the valve body 13 at a certain position, that is, at a position facing the opening 3. . The stopper may be configured to receive the lowering of the valve body 13 itself. Reference numeral 32 denotes a driving mechanism for rotating and driving the hoisting shaft 27. Reference numeral 33 denotes a hoisting cylinder in the mechanism, for example, an air cylinder is used.
Reference numeral 34 denotes a chain, the lower end of which is connected to a piston rod of a cylinder 33, and the upper end of which is connected to a chain sprocket 35 attached to a hoisting shaft 27. The connection can be performed in the same manner as the connection of the cable body 31 to the ring body 29. In such a drive mechanism 32, the hoisting shaft 27 can be driven to rotate forward and backward by the expansion and contraction of the cylinder 33. Note that, as the drive mechanism 32, a motor with a speed reducer or another rotary drive mechanism may be used.

Next, the heat shielding plate elevating mechanism 23 will be described.
Reference numeral 37 denotes a ring for winding the heat shield plate, which is, for example, a chain sprocket, and is fixed to the winding shaft 27. Reference numeral 38 denotes a cord, for example, a chain, the upper end of which is connected to the ring body 37, and the lower end of which is connected to the heat shield plate 17. The connection of the cable body 38 to the ring body 37 can be performed in the same manner as the connection of the cable body 31 to the ring body 29. Reference numeral 39 denotes a ring for guiding the cable body 38,
It is mounted on a shaft 41 which is rotatably mounted on the valve box 9 with a bearing 40. In the heat-insulating-plate elevating mechanism 23, the hoisting shaft 27 and the drive mechanism 32 in the valve element elevating mechanism 22 are commonly used. By the configuration, the valve body lifting mechanism 22
Is connected to the ring body 37 of the heat shielding plate elevating mechanism 23 via the clutch 30.

Next, the heat insulating door elevating mechanism 24 will be described.
Reference numeral 43 denotes a ring for winding up the heat-insulating door, for example, a chain sprocket is used, is rotatably mounted on the winding shaft 27, and is integrated with the ring 29 in the valve body lifting mechanism 22.
Reference numeral 44 denotes a cord, for example, a chain, the upper end of which is connected to the ring 43, and the lower end of which is connected to the heat insulating door 18. Wheel
The connection of the cord 44 to 43 can be performed in the same manner as the connection of the cord 31 to the ring 29. Reference numeral 45 denotes a guide ring, which is mounted on a shaft 47 which is rotatably mounted on the valve box 9 with a bearing 46.

Next, reference numeral 50 shown in FIG. 2 is a tightening mechanism for pressing the valve body 13 against the side surface of the furnace 1, which is also called a clamping device. The mechanism will be described with reference to FIGS. Reference numeral 51 denotes a clamp shaft, which is rotatably supported by a bearing 52 attached to the valve box 9. Reference numeral 53 denotes a clamp arm attached to the clamp shaft 51, and a free end contacting the valve body 13 is constituted by a rotatable roller 54. A drive mechanism (not shown) having the same configuration as that of the drive mechanism 32 is connected to the clamp shaft 51 of the tightening mechanism, and the clamp arm operates as indicated by an arrow in FIG.

Next, the operation of the valve device 8 and the treatment of the workpiece in the furnace 1 will be described with reference to the following Table 1.
In Table 1, the upper end or the lower end of the valve body 13 and the heat shield plate 17 indicate a state in which they are at the ascending position or the descending position, respectively.
In Table 1, a left-pointing arrow “←” indicates the same state as the state before it (the same state as the column immediately to the left in the table).

[0015]

The opening 3 of the furnace 1 is closed by the valve 13,
In a state where the valve body 13 is tightened to the furnace 1 by the tightening mechanism 50 and the packing 16 is in close contact with the valve seat 5, a heat treatment of the workpiece is performed in the furnace 1 as is well known. When the heat treatment is completed, the valve 13 is opened as follows. First, the fastening mechanism 50 is loosened. Then, the end of the ring body 29 on the side of the opening 3 is located slightly closer to the side opposite to the side of the opening 3 than the position immediately above the valve body 13 which is fastened to the side surface of the furnace 1. Therefore, the valve 13 is separated from the side of the furnace 1, and the packing 16 is separated from the valve seat 5. Next, when the cylinder 33 is extended, the ring body 37 rotates, the cable body 38 is extended, and the heat shield plate 17 is moved between the valve body 13 and the opening 3 from the raised position shown in FIG. Aim the packing of the valve body 16
And descends to the descending position opposite to. Next, the clutch 30 is engaged and the cylinder 33 is contracted. As a result, the ring body 29 and the ring body 37 rotate integrally, and the rope bodies 31, 38 are wound up. Then, the valve body 13 rises from the lowering position facing the opening 3 to the raising position retracted above the lowering position. The heat shield plate 17 also rises from the lowered position to a raised position retracted above the same together with the valve body 13 in a synchronized state. In this case, the ring 43 also rotates integrally with the ring 29,
44 is wound up, and the heat insulating door 18 rises together with the valve 13. By raising the valve 13 and the heat shield 17 as described above, even if the packing 16 rises in front of the opening 3,
High heat radiation from the furnace 1 is blocked by the heat shield 17
Thus, the packing 16 is prevented from being damaged.
The valve 13 and the heat shield 17 do not necessarily need to be raised at the same speed. That is, the heat shield plate 17 has the opening 3 with respect to the packing 16.
The heat shield plate 17 may be raised at a predetermined speed ratio with respect to the rise of the valve body 13 so that the heat shield plate 17 is located at a position where high heat radiation is blocked.
The raising (or lowering) of the valve body 13 and the heat shield plate 17 in such a relationship is referred to as synchronization in the present specification.

As described above, the valve body 13, the heat shield plate 17, and the heat insulating door 18
In the state in which all are raised, the object to be processed in the furnace 1 is sent out to the next stage through the opening 3. When the delivery is completed, the cylinder 33 is extended again. Also in this case, since the clutch 30 is in the connected state, the ring body 29 and the ring body 37 rotate integrally and the rope bodies 31 and 38 are extended, and the valve body 13 and the heat shield plate 17 are synchronized. Descend. Even during this lowering, the high heat radiation from the opening 3 to the packing 16 is
Blocked by 17. When the valve body 13 moves down to the lower position facing the opening 3, the clutch 30 is disengaged and the cylinder 30 is disengaged.
33 is contracted. As a result, only the ring body 37 rotates, and the heat shield plate
17 is raised to the raised position. When it reaches the raised position, the tightening mechanism 50 is actuated, the valve body 13 is pressed against the side surface of the furnace 1, and the packing 16 comes into close contact with the valve seat 5. In this state, the next heat treatment of the object is performed in the furnace.

Next, FIG. 4 showing a different embodiment of the present invention will be described. In this example, separate hoisting shafts 61 and 62 are provided for the valve body elevating mechanism 22e and the heat shield plate elevating mechanism 23e, and the respective hoisting wheels 29e and 37e are fixed to the hoisting shafts. There is a drive mechanism on each hoisting shaft outside the valve box 9e.
32e and 32e 'are connected. The rings 29e and 37e are clutches
Connected via 66. That is, interlocking tuning sprockets 63 and 64 are mounted on each of the hoisting shafts 61 and 62, one of which is directly mounted via the clutch 66, and the other is directly mounted. The clutch 66 may be provided between the hoisting shaft 62 and the sprocket 64.

In such a configuration, the heat shield plate 17e is raised or lowered by the drive mechanism 32e 'with the clutch 66 being disengaged, and the drive mechanism 32e, By raising or lowering the valve body 13e and the heat shield plate 17e together by 32e ', the same operation as in the above embodiment can be performed. In addition, portions that are considered to have the same or equivalent configuration as those in the previous figure in terms of function are denoted by the same reference numerals as in the previous figure with the letter e, and redundant description is omitted. (Also in the following figure, the same idea is added with the letter "f" and duplicate description is omitted.)

Next, FIG. 5 shows a ring 37f of the heat shielding plate elevating mechanism 23f.
This shows an example in which a clutch 71 is also provided between the shaft 71f and the winding shaft 27f. In this example, as in the example of FIG.
In the case where the packing is provided on the valve seat 5 of FIG. 1 instead of the packing 13 on the valve 13 and the furnace is hermetically sealed by bringing the valve body 13f into close contact with the packing, the opening of the furnace is opened. However, when a high-temperature object to be processed is conveyed therethrough, radiant heat from the object can be shielded by the heat shield plate 17f to protect the packing. The operation of each member in that case is as shown in Table 2 below.

[0021]

[0022]

As described above, in the present invention, when the valve body 13 is raised to open the opening 3 of the furnace 1 after the heat treatment in the furnace, the packing 16 of the valve body 13 is used. Even if the gas passes through the opening 3 which receives high heat radiation in the furnace, the radiation is blocked by the heat shield plate 17 which rises together with the valve 13 so that the packing 16 can be prevented from being damaged by heat. This has the advantage that the life of the packing 16 can be prolonged and the troublesome replacement work as in the prior art can be greatly reduced.

Further, in the valve device of the present invention, the valve 13
Even if the high heat radiation of the furnace with respect to the packing 16 is blocked by the heat shield plate 17, the valve body 13 and the heat shield plate 17 are connected to different winding rings 29, 37 from each other. When the opening 3 of the furnace is closed by the valve body 13, the heat shield plate 17 is raised and packing is performed.
16 can be exposed and the opening 3 by the packing 16
This has the effect that the hermetic seal can be performed without hindrance.

In addition, even when the valve body 13 and the heat shield plate 17 are wound up by separate rings 29 and 37 as described above, when the valve body 13 is raised as described above, the distance between the two rings 29 and 37 is increased. By connecting the clutch 30, the valve body 13 and the heat shield plate 17 can be raised in synchronization with each other, and there is an effect that the packing 16 can be reliably protected by the heat shield plate 17.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a structure near a gate valve device of a furnace.

FIG. 2 is a vertical cross-sectional view showing a state where the valve box is cut at the position of line II-II in FIG. 1 (a heat insulating door is not shown).

FIG. 3 is an enlarged sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a schematic perspective view showing a different embodiment.

FIG. 5 is a schematic perspective view showing still another example.

FIG. 6 is a longitudinal sectional view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace 3 Opening 13 Valve 16 Packing 17 Heat shield 29 Ring for winding valve 31 Cable 37 Ring for winding heat shield 38 Cable

Claims (2)

(57) [Claims] 1. A valve body in which a packing in a valve body is closely attached to a periphery of an opening on a side surface of a furnace is separated from a side surface of the furnace so that the packing is separated from a periphery of the opening. Next, in a method of opening a valve body in a furnace that raises the valve body to open the opening,
A heat shield plate large enough to shield the heat between the packing and the opening is prepared in advance, and in opening the opening, the valve body is separated from the side of the furnace. After that, the packing is shielded by the heat shield by positioning the heat shield between the furnace and the valve body. Thereafter, the heat shield is interposed between the opening and the packing. A method for opening a valve body in a furnace, wherein the valve body and the heat shield plate are raised together in a state. 2. A valve body for closing an opening on the side of the furnace,
The valve body between a lower position facing the opening and a raised position retracted above the main body, and a packing attached around the surface of the main body facing the opening. A valve body elevating mechanism for moving the
A valve device for a furnace, comprising: a fastening mechanism for fastening the valve body to the furnace in order to bring the packing in the valve body into close contact with the periphery of the opening. A heat shield plate of a size sufficient to shield the heat between the heat shield plate, a lower position facing the packing of the valve body at the lower position, and a higher position retracted above the lower position. A heat-insulating plate elevating mechanism for moving up and down between the valve body and the valve body elevating mechanism and the heat-insulating plate elevating mechanism are provided for the windings respectively provided near the respective ascending positions of the valve body and the heat-insulating plate. A ring body, and a cable body having an upper end connected to each of the ring bodies and a lower end connected to the valve body and the heat shield plate, respectively, and a winding body for winding the valve body and heat insulation. A valve device for a furnace, wherein the valve device is connected to a ring for winding a plate via a clutch.