JPS6242000Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bar fixing device for a steam-heated drying cylinder that can be applied to a drying cylinder for a paper machine.

The drying cylinder conventionally used in paper machines is a cast iron roll that has a hollow cylindrical shape with both ends closed. Steam is introduced into the cylinder, and the heat is used to dry the paper that is passed through the cylinder's outer circumferential surface. Ta.

FIG. 1 is a longitudinal sectional view of a conventional drying cylinder, and FIG. 2 is a cross-sectional view thereof. 1 and 2, a plurality of bars 2 are arranged on the inner wall of a cylinder body 1 at approximately equal intervals in the longitudinal direction of the surface. This bar 2 is fixed by bolts to a plurality of sets of expansion rings 3 and 3', and is expanded using two sets of turnbuckles 4 provided at the ends of the expansion rings 3 and 3'. By expanding the ends of the open rings 3 and 3', the outer surface of the bar 2 was pressed against the inner wall of the cylinder body 1.

However, as explained above, the conventional structure does not take into account the influence of thermal expansion caused by steam on the expansion rings 3, 3'. That is, if the tightening of the turnbuckle 4 was appropriately adjusted when the bar 2 was attached, the expansion ring would bend due to thermal expansion during use, making it impossible to evenly fix the bar 2, which could cause the bar 2 to shift.

Also, when installing, adjust the tightening of the turnbuckle 4 in consideration of the thermal expansion of the expansion ring.
When the thermal expansion was insufficient immediately after the start of operation, there was a possibility that the bar 2 would not be fixed uniformly and would shift.

The present invention aims to provide a bar fixing device for a steam-heated drying cylinder that can evenly press the bar fixed to the expansion ring against the inner wall of the cylinder body both when starting up the paper machine and during operation. A coil spring is attached between the ends of adjacent expansion rings in a set of expansion rings, and the shaft of the bolt inserted into the end of one expansion ring is Passing through the center of the coil of the coil spring, it is inserted into the end of the other expansion ring, and by tightening the nut, the adjacent expansion rings are fixed, and by setting the nut in the appropriate position, In one set of expansion rings, the coil springs prevent uneven compression of the expansion rings, and the bar can be evenly pressed against the inner wall of the cylinder. Further, since the bar is fixed to the inner wall of the cylinder body by the expansion ring and the coil spring, the thermal expansion of the expansion ring can be absorbed by the coil spring, and the bar can be evenly pressed against the cylinder wall.

The embodiment of the present invention will be explained below with reference to the drawings. Fig. 3 is a longitudinal cross-sectional view of a drying cylinder showing an embodiment of the present invention, Fig. 4 is a cross-sectional view of the drying cylinder, and Fig. 5 is a detailed view of section A in Fig. 4. be. 3 and 4, a plurality of bars 12 are arranged on the inner wall of the cylinder body 11 at approximately equal intervals in the longitudinal direction.
This bar 12 is fixed to a plurality of sets of expansion rings 13 by bolts.

In addition, in one set of expansion rings, adjacent expansion rings 1
A coil spring 14 is provided between the ends of the expansion ring 13, and the shaft of the bolt 15 inserted into the hole at the end of one of the expansion rings 13 is connected to the coil spring 14.
passes through the center of the coil, and is inserted into the hole at the end of the other expansion ring 13, and is tightened with the nut 16, thereby fixing the adjacent expansion rings 13, 13, respectively, and forming a pair of expansion rings 13. The ring is assembled. The bar 12 is fixed to the inner wall of the drying cylinder 11 using a plurality of sets of the expansion rings. Note that δ is the gap between the expansion ring 13 and the nut 16.

Next, to explain the operation, in one set of expansion rings, each expansion ring 13 has a coil spring 14.
The coil spring 14 prevents the entire expansion ring from being compressed unevenly, and allows the bar 12 to be evenly pressed against the inner wall of the cylinder 11. Further, the thermal expansion of the expansion ring is absorbed by the coil spring 14, and the bar 12 can be evenly pressed against the inner wall of the cylinder 11.

Since the present invention is constructed as explained in detail above, during the operation of the paper machine, the deflection due to thermal expansion of the expansion ring is absorbed by the coil spring, and the outer surface of the bar is evenly moved toward the inner wall of the cylinder without shifting. Can be crimped. Therefore, there are no drawbacks such as the bar not being fixed uniformly and shifting as in the prior art.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a part of a conventional drying cylinder for a paper machine, FIG. 2 is a sectional view of FIG.
FIG. 3 is a side sectional view showing a part of a bar fixing device for a drying cylinder showing an embodiment of the present invention, and FIG.
5 is a detailed view of section A in FIG. 4. Explanation of main parts of the figure, 11...Cylinder body, 1
2...Bar, 13...Expansion ring, 14...Coil spring, 15...Bolt, 16...Nut.

Claims (1)

[Scope of utility model registration request] A large number of bars arranged in parallel in the axial direction on the inner wall of a drying cylinder of a paper machine are attached to a plurality of expansion rings arranged in the circumferential direction with bolts, and
A coil spring is interposed between adjacent ends of the expansion ring,
A bar fixing device for a steam-heated drying cylinder, characterized in that a bolt is passed through the coil spring and passed between adjacent ends of the expansion ring, and the bolt is fixed between the ends with a nut.