JPH08355Y2 - Inner cover sealing device for bell-type coil annealing furnace - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner cover sealing device for a bell-type coil annealing furnace that seals between a base and an inner cover in a bell-type coil annealing furnace.

[0002]

2. Description of the Related Art In a bell-type coil annealing furnace in which an inner cover and an outer cover are packaged on a coil stacked on a base in several stages and the coil is annealed by a heating device provided in the outer cover, coil oxidation is prevented. In order to make the coil surface glossy, atmospheric gas is constantly circulated in order to maintain the reduced state inside the inner cover during heating. Further, the leakage of the atmospheric gas leads to an increase in the consumption of the atmospheric gas and the oxidation of the coil due to the invasion of the external air, so that the seal between the inner cover and the base is essential.

Therefore, conventionally, a sealing device shown in FIGS. 2 and 3 has been known as a sealing device for preventing leakage of atmospheric gas. In the sealing device of FIG. 2, an annular base 32 is continuously arranged around the coil support base 31 of the base 30, and the endless seal ring 3 is continuously provided along the upper surface thereof.
3 are arranged. Further, a plurality of bases 34 are arranged outside the annular base 32, and the upper stage locking portions 36 are provided on the bases 34.
A clutch 35 having a lower locking portion 37 is attached rotatably along a horizontal plane.

In this sealing device, the outer peripheral flange portion 39 of the inner cover 38 is placed on the annular base 32, and the upper and lower engaging portions 36 and 37 of the clutch 35 are connected to the flange portion 3.
9 and the annular base 32, respectively, and the seal ring 33 seals between the outer peripheral flange portion 39 and the annular base 32.

Next, in the sealing device of FIG. 3, the base 40
The inner cover accommodating portion 44 is continuously provided outside the coil support base 41 in FIG. The inner cover accommodating portion 44 is surrounded on the inside and outside by the water cooling jackets 42 and 43, and the bottom portion 45 is widened inward and outward. Also, the bottom 4
5, an annular rubber bellows 46 that expands and contracts in the inward and outward directions,
47 are arranged to face each other, and respective rubber bellows 46, 4
7 is connected to the pressure adjusting device 48. Incidentally, 49 is an outer cover, and 50 is an inner cover.

In this sealing device, the outer peripheral lower end portion 51 of the inner cover 50 is inserted into the inner cover accommodating portion 44. In addition, the rubber bellows 46, 47 are provided with a pressure adjusting device 4
Atmosphere gas etc. is supplied from 8 and the rubber bellows 46, 4
7 contacts the inner and outer surfaces of the inner cover 50 and the inner cover accommodating portion 44, and the base 40 and the inner cover 50 are sealed.

[0007]

However, in the sealing device of FIG. 2, the sealing surface with which the seal ring 33 is in contact,
That is, the upper surface of the annular base 32 and the lower surface of the outer peripheral flange portion 39 must be accurately processed. Further, if the distortion allowance of the seal ring 33 is increased, the tightening ability of the clutch 35 must be increased, which leads to an increase in the size of equipment and a cost increase. Further, when the inner cover 38 is pressed, a force acts on the inner cover 38 upward, and the tightening force of the seal ring 33 is reduced, so that the sealing performance is reduced.
Furthermore, there is a problem that dust is likely to adhere to the upper surface of the seal ring 33 to cause deterioration in sealing performance.

On the other hand, in the sealing device of FIG. 3, rubber bellows 46 and 47 are doubly arranged inside and outside the inner cover 50, and the inner cover accommodating portion 44 is a hermetically sealed chamber having a complete gas tight structure. Therefore, the structure of the inner cover accommodating portion 44 is complicated, and the rubber bellows 46, 4
A great deal of labor is required for mounting 7 and connecting to the pressure adjusting device 48. In addition, it is difficult to clean the dust that has fallen into the inner cover accommodating portion 44, and poor cleaning results in poor sealing performance and poor contraction of the rubber bellows 46 and 47. Further, in a furnace that employs a vacuum purge, air is trapped between the bottom surface of the inner cover accommodating portion 44 and the rubber bellows 46, 47, and it is difficult to raise the vacuum degree of the inner cover 50, and the air pressure is reduced. When the temperature of the pooled portion rises, the air in that portion leaks into the inner cover 50 and the degree of vacuum is lowered.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an inner cover sealing device is provided with a recess formed continuously in the circumferential direction along the outer peripheral side wall portion of the coil support base. Inside the inner cover, a groove and a dust receiving step portion located above the groove, an endless bending / expanding tube accommodated in the concave groove, an expansion / contraction device for inflating the bending / expansion tube to closely contact the inner peripheral surface of the inner cover. A dust blocking plate continuously provided in the circumferential direction along the peripheral side wall portion, a plurality of first locking portions provided on the inner cover, and a plurality of first locking portions provided on the base for engaging with the first locking portions. It is configured by a second locking portion that prevents the inner cover from moving upward, and a cooling device that cools the bending tube.

[0010]

In the inner cover sealing device described above, the bending / expanding tube expanded by the expanding / contracting device comes into contact with the inner cover mounted on the coil supporting base to seal between the inner cover and the coil supporting base. Further, the engagement of the first locking portion and the second locking portion prevents the inner cover from moving upward. Further, the bending device is cooled by the cooling device, and thermal deterioration is prevented.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a cross section of an inner cover seal portion in a bell-type coil annealing furnace. A coil support base 2 formed on a base 1 is provided with a recess groove 4 in an outer peripheral side wall portion 3 and a dust receiving step portion 5 located thereabove. Each is continuously formed in the circumferential direction, and water cooling jackets 6 are formed above and below and inside the concave groove 4. An annular rubber bellows 7 is arranged in the groove 4, and the rubber bellows 7 is connected to a gas supply device 9 via a seal gas switching valve 8.

An inner cover support base 10 is fixed to the outside of the coil support base 2, and a latch support base 11 is fixed to the outside of the inner cover support base 10. A latch 12 which is a second locking portion is attached to the latch support base 11 by the coil support base 2.
It is connected so that it can swing toward. A base 13 is fixed to the outside of the latch 12 and a rod 15 of a cylinder 14 provided on the base 13 is connected to the latch 12.

A water cooling jacket 17 is formed on the lower end side of the inner cover 16, and a flange portion 18 which also functions as a first locking portion is provided outside the water cooling jacket 17. Further, the inner cover 16 is provided with a dust shelter plate 19 continuously formed at a predetermined height on the inner surface thereof in the circumferential direction, and a seal portion 20 continuously provided on the outer surface thereof in the circumferential direction. Reference numeral 21 is an outer cover, and 22 is a seal plate provided on the bottom of the outer cover 21.

In the above structure, when the inner cover 16 is not exteriorly mounted on the base 1, the expansion / contraction gas such as an inert gas in the rubber bellows 7 is exhausted by the seal gas switching valve 8 and the rubber bellows 7 is contracted. ing. Also,
The latch 12 is retracted in the direction of the arrow a ′ by the cylinder 14 to open the entrance path of the inner cover 16.

When the inner cover 16 is mounted, the inner cover 16 is lowered from above the base 1, and the outer peripheral flange portion 18 is placed on the inner cover support 10. The outer cover 21 is mounted on the inner cover 16, is supported by the base 13, and the seal plate 22 is placed on the seal portion 20. Then, the engagement between the first locking portion and the second locking portion, that is, the latch 12 advances by the cylinder 14 in the direction of arrow a and is locked by the outer peripheral flange portion 18, and the upward movement of the inner cover 16 is restricted. . Further, as the expansion / contraction device, expansion / contraction gas is supplied from the gas supply device 9 to the rubber bellows 7, the rubber bellows 7 expands, and the coil support base and the inner cover 16 are expanded.
The space between the inner cover 16 and the inner cover 16 is sealed, and the inner atmosphere of the inner cover 16 is prevented from leaking. Further, cooling water is supplied to the water cooling jackets 6 and 17 which are cooling devices for cooling the bending tube, and thermal deformation and deterioration of the rubber bellows 7 are prevented.

The inner cover 1 is circulated by circulation of atmospheric gas.
The dust that floats inside 6 and falls near the inner surface is
It is received by the dust shield 19. Further, the dust that has entered between the coil support base 2 and the inner cover 16 without being caught by the dust catching plate 19 is captured by the dust receiving step 5. Therefore, very little dust drops on the rubber bellows 7, and the accumulated dust can be easily removed when the inner cover 16 is not attached. Moreover, the sealing surface of the rubber bellows 7 is located in the vertical direction, and dust is not accumulated on the sealing surface. Therefore, the sealing property of the rubber bellows 7 is stably maintained for a long period of time.

In the above embodiment, the rubber bellows 7 is provided on the outer peripheral side wall portion 3 of the base 1 in only one step. However, a plurality of steps, such as two steps and three steps, may be provided to form a multiple seal structure. However, in order to prevent air accumulation between the upper and lower rubber bellows, for example, when arranging two stages of rubber bellows, first seal the inner cover only with the lower rubber bellows, and after vacuum processing, the upper rubber bellows. It is necessary to re-seal with.

[0018]

As is apparent from the above description, according to the inner cover sealing device of the present invention, the bending / expanding tube is brought into close contact with the inner peripheral surface of the inner cover, and the cooling device prevents thermal deformation of the bending / expanding tube. To be prevented. Further, impurities such as dust hardly accumulate on the sealing surface of the bending tube, and even if impurities are attached, they can be easily removed when the inner cover is not attached. Further, no air accumulation portion is formed around the bending and stretching tube. Therefore, the space between the inner cover and the base is completely sealed, and it is possible to completely prevent leakage of atmospheric gas and invasion of outside air into the inner cover.

[Brief description of drawings]

FIG. 1 is a sectional view of a sealing device according to the present invention.

FIG. 2 is a sectional view of a conventional sealing device.

FIG. 3 is a sectional view of a conventional sealing device.

[Explanation of symbols]

1 ... Base, 2 ... Coil support, 3 ... Outer peripheral side wall, 4 ...
Recessed groove, 6 ... Water cooling jacket, 7 ... Rubber bellows, 8 ... Seal gas switching valve, 9 ... Gas supply device, 12 ... Latch, 14
… Cylinder, 16… Inner cover, 17… Water cooling jacket, 18… Flange part.

Claims (1)

[Scope of utility model registration request] 1. A bell type coil annealing furnace, wherein an inner cover sealing device for sealing between a coil support base of a base and an inner cover is continuously provided in a circumferential direction along an outer peripheral side wall portion of the coil support base. Concave groove and a dust receiving step portion located above the concave groove, an endless bending / expanding tube housed in the concave groove, an expansion / contraction device for inflating the bending / expanding tube to make close contact with the inner peripheral surface of the inner cover, and A dust shelter plate continuously provided in the circumferential direction along the inner peripheral side wall of the cover, a plurality of first locking portions provided on the inner cover, and engaging with the first locking portions provided on the base. A bell-shaped coil annealing furnace inner cover sealing device comprising: a second locking portion that prevents the inner cover from moving upward; and a cooling device that cools the bending tube.