JPH0332522Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a roll sealing device suitable for application to an atmospheric gas sealing roll used in a vacuum evaporation plating device for steel strips, a continuous annealing furnace, and the like.

In lines where steel strips are continuously subjected to treatments such as annealing, heat treatment, and plating, the pressure, temperature, composition, etc. of the atmospheric gas in each chamber of the equipment are determined according to the purpose.
It is necessary to minimize the movement of gas between adjacent rooms or the outside air, which requires a sealing device at the boundary.

Particularly when the pressure difference between the chambers is large, a large amount of atmospheric gas flows through the gap at the boundary, which not only makes it difficult to maintain gas conditions, but also makes it difficult to maintain gas conditions. There were disadvantages such as increased capacity of processing equipment and higher equipment costs.

Figures 1 and 2 show an example of a conventionally used roll seal device, in which 1 is a steel strip with a thickness of t, 2,
A sealing roll 3 is provided at the boundary between the chambers 5 and 6 in the casing 4 in order to restrict the movement of atmospheric gas between the chambers. Gas flows from the high-pressure chamber to the low-pressure chamber, the gap between the rolls δ ₁ and the gap on the back of the rolls δ′ ₁
and flows through the gap δ″ ₁ between the roll end faces.

The gaps δ ₁ , δ′ ₁ , δ″ ₁ are preferably as small as possible, and δ
′ ₁
and δ″ ₁ can be suppressed to the minimum structurally allowable gap, but since δ ₁ varies in the thickness t of the steel strip being threaded, the roll must be set to the maximum thickness. For this reason, when passing a thin steel strip, the gap becomes large and the gas flow rate increases, making it difficult to maintain atmospheric conditions.Therefore, as a countermeasure against variation in plate thickness, conventional measures have been taken to reduce the plate thickness. A method of adjusting the roll position has also been adopted, but in this case, the structure is complicated and the operation requires manpower.

The present invention eliminates the above-mentioned conventional drawbacks and provides a roll sealing device that does not change the sealing performance even if the thickness of the steel strip to be threaded changes as described above in a fixed roll seal roll. That is. In other words, the gist is:
In a roll sealing device that has a pair of upper and lower sealing rolls that can rotate freely with a steel strip in between, the upper roll is mounted on a bearing via an arm so as to be swingable about a pin, and the upper and lower rolls are A seal bar that maintains the gap without contacting the sealing roll with a gap adjustment mechanism is installed in front or behind the roll in response to the flow of the steel strip, and can be adjusted to keep the gap δ ₂ to a minimum. It is an object of the present invention to provide a roll seal device that can reduce the movement of gas and stabilize the gas conditions in each chamber.

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 3 and 4 show one embodiment of the present invention, and FIG. 4 shows a cross section from A to A in FIG. 3. Now, in FIG. 3, 1 is a steel strip, and 2 and 3 are sealing rolls. 4 is the casing, and the lower roll 3 is the bearing 9
Since the upper roll 2 is rotatably fixed to the casing 4 via the arm 7 and the bearing 8, the roll 2 can swing around the pin 17 as shown by the arrow. I can do it.

10 and 11 are upper and lower seal bars, which can slide within the guide ₁₆ of the casing 4 as _shown in FIG. Hold. 15
is a graphite provided at the tips of the seal bars 10 and 11, and should the rolls 2 and 3 and the seal bar 1
Even if the rolls 0 and 11 come into contact, the rolls 2 and 3 will not be scratched.

Next, to explain the effect, the gap between chambers 5 and 6 through which the atmospheric gas flows is δ ₂ ,
Only δ' ₂ and δ ₃ are present, and the gap corresponding to δ ₁ in FIG. 1 is zero because the rolls 2 and 3 are in contact with the steel strip 1. Therefore, the flow rate is reduced and the gas conditions in each chamber are stabilized. Also, the gaps δ ₂ and δ′ ₂ are adjusted by adjusting pin 1.
Since the tip 14 of 3 is eccentrically attached as shown in FIG. 4 and the B-B cross section of FIG. 4 (FIG. 5), it can be easily adjusted by rotating the adjustment pin 13. Furthermore, in the event that a foreign object should become caught between the rolls 2, 3 and the seal bars 10, 11, the spring 12 will be bent and the device will not be damaged.

When the present invention was tested using the following concrete example structure, extremely excellent effects were obtained.

Diameter of upper and lower sealing rolls 2 and 3: approx. 200mm
φ The roll seal device shown in FIG. 3 was prepared with gaps δ ₁ and δ _{2 between 0.2 and 1.0 mm between the rolls 2 and 3} and the seal bars 10 and 11, and the pressure on the upstream chamber 5 side and the pressure on the downstream chamber 6 side were When tested with the following settings (using four sealing devices as a vacuum differential pumping system), sealing was performed with good performance.

Upstream chamber 5 side pressure Downstream chamber 6 side pressure 760 ^Torr 200 ^Torr 200 ^Torr 40 ^Torr 40 ^Torr 5 ^Torr 5 ^Torr 10 ^-1Torr As explained in detail above, in this invention, the upper roll of the roll seal is made swingable. Even if the thickness of the steel strip to be threaded changes, the sealing performance will not change. In addition, a seal bar is installed in front or behind the upper and lower rolls to prevent the flow of the steel strip from coming into contact with the sealing roll. can be maintained at optimum dimensions, thereby reducing the movement of atmospheric gas and stabilizing the gas conditions in each chamber.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an example of a conventional roll seal device, FIG. 2 is a front sectional view thereof, third is a side sectional view of a roll seal device showing an embodiment of the present invention, and FIG. 4 is a side sectional view showing an example of a conventional roll seal device. 3 is a cross-sectional view taken along line A-A, and FIG. 5 is a cross-sectional view taken along line B-B in FIG. 4. Explanation of the main parts of the diagram, 1... Steel strip, 2, 3...
Seal roll, 4...Casing, 7...Arm, 10, 11...Silver, 12...Spring, 1
3...adjustment pin, 17...pin.

Claims (1)

[Scope of utility model registration request] In a roll sealing device that has a pair of upper and lower sealing rolls that can rotate freely with a steel strip in between, the upper roll is mounted on a bearing via an arm so as to be swingable about a pin, and the upper and lower rolls are A roll sealing device characterized in that a seal bar is provided in front or behind the roll with respect to the flow of the steel strip, and the seal bar maintains a gap without coming into contact with the sealing roll by a gap adjustment mechanism.