JPH09267114A - Shaft sealing device for submerged device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute repairing work for changing the components of a seal in a short time. SOLUTION: In this device, the shaft part 4 of a roll 2 arranged in a liquid tank 1 is supported with a bearing on the outside of the liquid tank 1 and also the shaft part 4 is liquid-tightly sealed between the side wall 3 of the tank and a shaft bearing 5. A flange 21 consisting of an inner race part 22 and outer race part 23 which are mutually attachable and detachable and whose outside diameter is larger than the roll diameter is provided on the shaft part 4, an annular channel member 27 which is opened on the flange side is provided on the side wall 3 of the liquid tank 1, an expandable and shrikable tube 28 and a sealing member 29 are arranged in this channel member and the sealing member 29 is pressed against the outer race part 23 under expansion of the expandable and shrinkable tube 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged roll shaft sealing device arranged in a process line for cold rolling, surface treatment, etc., and can easily repair damage or wear of a seal mechanism member. It also facilitates the replacement work of the roll itself.

[0002]

2. Description of the Related Art A conventional device of this type is shown in FIG. 3 in a schematic vertical sectional view, in which 1 is a liquid tank,
Reference numerals 2 respectively denote rolls horizontally arranged in the liquid tank. Here, the roll 2 is the side wall 3 of the liquid tank 1.
Bearing 5 fitted on its shaft part 4 on the outside of the
Is supported by being mounted on the bearing base 6, and leakage of the liquid in the liquid tank 1 is prevented by a mechanical seal 7 provided between the side wall 3 and the bearing 5.

By the way, in the mechanical seal 7 here, while the rotary ring 8 is mounted on the shaft portion 4,
One end of the rubber boot 10 is liquid-tightly connected to the side plate 9 fixed to the tank side wall 3, and the other end of the rubber boot 10 presses the annular carbon seal 11 against the rotating ring 8 via the rigid ring 12. The rubber boot 10 has the elastic restoring force of the annular carbon seal.
The liquid 11 is prevented from leaking by pressing 11 against the rotating ring 8 with a required force. In the figure, 13 indicates a nut for fastening and fixing the bearing 5 at a predetermined position of the shaft portion 4, and 14 indicates a bearing cover.

[0004]

However, in such a conventional technique, the rubber boot including the rigid ring 12 is used.
Both the inner diameter of 10 and the inner diameter of the annular carbon seal 11 are
Since the outer diameters of the bearing 5 and the rotating ring 8 are set to be smaller than each other, for example, deterioration of the rubber boot 10
When liquid leakage occurs due to wear or breakage of the annular carbon seal 11, it is necessary to remove the bearing 5 and the rotary ring 8 from the shaft portion 4 in order to replace these components. Since 5 is normally shrink-fitted to the shaft portion 4, it takes a lot of time and work man-hours for removing them and fitting them again, and it takes 3 to 4 times to complete the parts replacement. There is a problem in terms of repair work efficiency, which means that it takes a long time, and eventually in processing efficiency in the process line.

In addition, in this prior art, it is necessary to remove the side plate 9 from the side wall 3 when the roll 2 is replaced, and the work of attaching and detaching the face plate 9 requires more than one hour. There was also.

The present invention has been made as a result of studies aimed at solving such problems of the prior art, and an object of the present invention is to make the replacement of the constituent members of a mechanical seal simple and easy. It is an object of the present invention to provide a submerged roll shaft sealing device capable of greatly shortening the working time and a submerged roll shaft sealing device capable of simply and quickly exchanging rolls.

[0007]

SUMMARY OF THE INVENTION A submerged roll shaft sealing device of the present invention supports a shaft portion of a roll disposed in a liquid tank by bearings outside the liquid tank.
A liquid-tight seal is provided between the side wall of the liquid tank and the shaft bearing, and the shaft part is composed of an inner ring part and an outer ring part that are mutually removable, and the minimum outer diameter of the inner ring part is A flange that is larger than the outer diameter of the shaft bearing is provided, and an annular channel member that opens to the flange side is attached to the side wall of the liquid tank, and the expansion and contraction tube and the seal member that are annular together are provided in the channel member. The seal members are sequentially arranged from the side wall side, and the seal member is pressed against the outer ring portion of the flange under the expansion of the expansion / contraction tube.

In this device, since the mechanical seal is formed on the outer peripheral side of the inner ring portion whose minimum outer diameter is larger than the outer diameter of the shaft bearing, a seal component, for example,
When it is necessary to replace the expansion / contraction tube, seal member, etc., simply remove the outer ring part of the flange from the inner ring part, and the required replacement work can be performed easily, easily, and in a short time while leaving the shaft bearing intact. You can do it at home.

Further, according to another aspect of the present invention, there is provided a roll-in-liquid shaft sealing device, wherein an opening having a size larger than the diameter of the roll is provided on one side wall of the liquid tank for accommodating the roll, through which the roll penetrates. At the outer surface of the side wall, an annular channel member that opens toward the outside is attached, and an expansion and contraction tube and a sealing member that are both annular in this channel member are sequentially arranged from the side wall side, and the sealing member is While expanding the expansion / contraction tube, press the flange on the shaft part of the roll outside the liquid tank, and attach the side plate that allows the shaft part of the roll to penetrate through the opening on the other side wall of the liquid tank. At the same time, an annular channel member that opens inward is provided on the inner surface of the side plate. A sealing member, sequentially arranged from the side plate, the sealing member, under inflation of inflation and deflation tubes, provided on the shaft of the roll inside the liquid tank,
It presses against another flange having an outer diameter equal to or smaller than the roll diameter.

In this apparatus, none of the flanges provided on each shaft portion of the roll is connected to any of the constituent members of the mechanical seal, and one side wall of the liquid tank has a size larger than the roll diameter. Since the flange that has an opening and the flange that exists inside the tank has an outer diameter that is less than or equal to the roll diameter, when replacing the roll, simply pull it out from the opening provided on one side wall. The roll can be taken out of the liquid tank without any troublesome attachment / detachment work of the seal component, which also applies when a new roll is accommodated in the tank through its opening. Therefore, the roll replacement work can be easily and easily performed in a short time.

[0011]

Embodiments of the present invention will be described below.
The description will be made based on the drawings. FIG. 1 is a vertical sectional view showing an embodiment of the present invention. In the figure, the same parts as those described in the prior art are designated by the same reference numerals.
Here, the rolls 2 horizontally arranged in the liquid tank 1
The bearing 5 is attached to the shaft portion 4 of the roll 2 on the outer side of the one tank side wall 3 through which the flange penetrates, and the flange 21 is provided on the shaft portion 4 between the bearing 5 and the side wall 3.
Install by shrink fitting and weld fixing. Therefore, this flange 21 rotates integrally with the rotation of the roll 2. Here, the flange 21 includes an inner ring portion 22 having a minimum outer diameter D ₀ larger than the outer diameter of the bearing 5, and the inner ring portion 22.
And an outer ring portion 23 that is detachably attached to the inner ring portion 23.
The outer ring portion 23 is fitted on the outer circumference of the inner ring portion 22, and the thin portions of both of them are tightened by a plurality of bolts 24.

The outer ring portion 23 is mounted by fitting the inner ring portion 22 having a uniform outer diameter with the outer ring portion 23 having an inner diameter corresponding to the outer diameter and at the mating surfaces of the inner and outer ring portions 22, 23. The bolts may be screwed together, or the inner and outer rings may be integrated without being divided.

Further, here, preferably, the outer ring portion 23
A super hard material is attached to the contact surface with a seal member described later by thermal spraying or a super hard alloy plate 25 to improve wear resistance of the outer ring portion 23, and by extension, the flange 21.

On the other hand, on the side wall 3, an opening 26 having a diameter D ₂ larger than the diameter D _{1 of the} roll 2 is provided.
An annular channel member 27 that opens in a channel shape toward the flange side is attached to the outer surface of the side wall 3 around 26.
Inside the channel member 27, an expansion and contraction tube 28 and a sealing member 29, which are both annular, are arranged sequentially from the side wall side, for example, a carbon seal. The expansion / contraction tube 28 here has a pressure passage 30 connected thereto, for example, by supplying pressurized air to the inside through a pneumatic passage,
It expands according to the set pressure, and functions to move the seal member 29 into the channel member 27 so as to advance and displace.
The seal member 29 is pressed against the outer ring portion 23 of the flange 21, preferably the superhard alloy plate 25, with a required force. By the way,
When the clearance between the seal member 29 and the superhard alloy plate 25 under the contraction of the expansion / contraction tube 28 is 5 mm and the expansion amount of the expansion / contraction tube 28 is 15 mm, the wear allowance of the sealing member 29 is limited. The capacity can be 10 mm.

Here, the supply pressure to the expansion / contraction tube 28 varies depending on the liquid level of the liquid tank 1, the contact condition of the seal member 29, etc., but normally 1 to 3 kg under the action of the pressure reducing valve. The pressure of / cm ² can sufficiently prevent the liquid from leaking.

On the other hand, the expansion / contraction tube 28 can be contracted to some extent only by stopping the supply of the pressure to the expansion / contraction tube 28.
Then, the seal member 29 can be completely contracted by being pushed in once, and thus the accidental detachment of the seal member 29 can be sufficiently prevented.

In the shaft sealing device as described above, when it becomes necessary to replace the constituent members of the mechanical seal, such as the expansion / contraction tube 28 and the seal member 29, the bearing 5 is left as it is, and the outer ring of the flange 21 is kept. By simply removing the part 23 from the inner ring part 22, it is possible to easily and easily replace the required components within a short period of time, greatly reducing the number of man-hours required for repair and increasing the operation rate of the process line. It can be effectively improved.

FIG. 2 is a view showing the seal structure of the shaft portion 34 with respect to the other side wall 33 of the liquid tank 1. Here, a cylindrical portion 35 having an inner diameter smaller than the diameter D ₁ of the roll 2 and protruding to the outside of the tank 1 is provided on the side wall 33, and an opening 36 of the cylindrical portion 35 penetrates the shaft portion 34 of the roll 2. A face plate 37 that allows the above is attached, and an annular channel member 38 that opens in the shape of a channel toward the inside of the tank 1 is provided on the inner surface of the face plate 37. 39 and sealing member
40 are sequentially arranged from the face plate side, and the sealing member
40 is provided on the shaft portion 34 of the roll 2 under the same expanded state of the expansion / contraction tube 39 as described above.
The outer surface of the flange 41 having an outer diameter of ₁ or less, that is, an outer diameter smaller than the tubular portion 35 in the figure is pressed.

Also in such a seal structure, by selecting the pressure supplied into the expansion / contraction tube 39 through the pressure passage 30 and appropriately adjusting the pressing force of the seal member 40 against the flange 41, Regardless of the contact state between the two and the liquid level in the tank, it is possible to sufficiently prevent the liquid from leaking.

By the way, on the other side wall 33 of the liquid tank 1,
This kind of seal structure and one side wall 3
The seal structure shown in FIG. 1 is applied to one roll 2.
The flanges 21 and 41 are
Is not connected to the base components, and one side
The opening 26 provided in the wall 3 has a roll diameter D₁Larger diameter D
_TwoIn addition, the flange 41 on the side wall 33 side is
Diameter D₁Since it has the following diameter,
If it becomes necessary to replace the wall from one side wall 3 side
Special removal work of seal components by simply pulling out
The roll 2 from the liquid tank 1 without performing any
You can take it out easily, easily and quickly.
Means that a new roll 2 is introduced into the liquid tank 1 through the opening 26.
The same applies when accommodating.

As is clear from the above description,
According to the shaft sealing device shown in FIG. 1, the bearing 5 is left as it is,
By simply removing the outer ring portion 23 of the flange 21 from the inner ring portion 22, the required seal component can be easily and quickly replaced,
Further, according to the shaft sealing device which is a combination of the seal structure shown in FIG. 1 and the seal structure shown in FIG. 2, the roll 2 can be simply inserted / removed through the opening 26 provided in the one side wall 3. Can be replaced easily and quickly.

[0022]

As described above, according to the present invention, the repair work for replacing the constituent members of the mechanical seal can be completed in a very short time, and the work time required for the roll replacement can be greatly shortened. be able to. In addition, here, by adjusting the supply pressure to the expansion / contraction tube, it is possible to always exhibit an excellent sealing function.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a seal structure for the other side wall of the liquid tank.

FIG. 3 is a schematic vertical sectional view showing a conventional structure.

[Explanation of symbols]

 1 Liquid tank 2 Roll 3,33 Side wall 4,34 Shaft part 5 Bearing 21, 41 Flange 22 Inner ring part 23 Outer ring part 24 Bolt 25 Super hard alloy plate 26, 36 Opening 27, 38 Channel member 28, 39 Expansion / contraction tube 29, 40 Seal member 30 Pressure passage 35 Cylindrical part 37 Face plate

Claims (2)

[Claims] 1. A shaft portion of a roll arranged in a liquid tank is supported by a bearing outside the liquid tank, and
A shaft sealing device for sealing a shaft portion liquid-tightly between a side wall of a liquid tank and a shaft bearing, wherein the shaft portion is provided with a flange composed of an inner ring portion and an outer ring portion which are detachable from each other, and the inner ring The minimum outer diameter of the portion is made larger than the outer diameter of the shaft bearing, and an annular channel member that opens to the flange side is attached to the outer wall of the liquid tank, and the expansion and contraction tube and the sealing member that are annular in the channel member. Are sequentially arranged from the side wall side, and the seal member is pressed against the outer ring portion of the flange under the expansion of the expansion and contraction tube, the shaft sealing device for the submerged roll. 2. A liquid tank for accommodating a roll is provided with an opening having a size larger than the roll diameter on one side wall through which the roll penetrates, and an annular shape which is open outward on the outer surface of the side wall around the opening. A channel member is attached, and an expansion and contraction tube and a sealing member, which are both annular, are sequentially arranged in the channel member from the side wall side, and the sealing member is expanded on the shaft portion of the roll under the expansion of the expansion and contraction tube. While pressing against the provided flange, in the opening provided in the other side wall, while attaching a face plate that allows the shaft portion of the roll to penetrate, the inner surface of the face plate is provided with an annular channel member that opens inward, Inside the channel member, an expansion and contraction tube and a seal member, both of which are annular, are sequentially arranged from the face plate side, and the seal member is expanded and contracted. A shaft sealing device for a submerged roll, wherein the shaft is pressed against another flange provided on the shaft portion of the roll and having an outer diameter equal to or smaller than the roll diameter.