JPH0134734Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a rotating roll having a vibration damping function.

This type of rotating roll structure is used as a basic mechanical element in various equipment, but the roll according to the present invention is made by inserting plate-shaped materials such as paper or metal between stacked rolls and continuously bonding them. Or stretch it out,
The present invention relates to a double-tube vibration damping roll that is particularly suitable for conveying machines such as rolling mills and corrugated board machines.

FIG. 1 shows a sectional view of the conventional roll structure. In the figure, 1 is an inner cylinder whose main purpose is to maintain bending rigidity as a roll, and 2 is an outer cylinder that is covered with the inner cylinder 1 and has a relatively thin wall to have a buffering capacity against external forces. Inner cylinder 1 and outer cylinder 2
The air gap 3 formed between the
A low melting point metal M having a melting point between °C, e.g. Pb,
Alloys such as Bi and Sn are sealed. Also, depending on the equipment, it may be necessary to heat the roll.
For example, in corrugating machines, a method is adopted in which heated steam is introduced into the hollow C of the roll in order to rapidly gel the liquid starch glue used to bond two sheets of paper in the nip of the roll to impart adhesive strength.

The inventors of the present invention proposed a method of encapsulating low melting point metal M in Utility Application No. 196797/1987, but low melting point metal M
The main reason for encapsulating it is that it has significantly better thermal conductivity than fluids such as water and oil, and its vibration damping ability due to its viscosity.

In the prior application, the low melting point metal M is in a molten state during steady operation, and it can be expected to have a vibration damping effect and heat transfer properties.

However, a problem may occur at the start-up of the equipment, that is, when steam is introduced into the roll hollow part C when the entire roll is at approximately room temperature, and the following points will be explained.

When the above-mentioned heating method is applied to the double-tube vibration damping roll of the prior application shown in Fig. 1, heated steam will be introduced into the hollow part C of the roll. When introduced, the inner cylinder 1 is first heated in the transitional stage leading to a steady state, so the inner cylinder 1 rapidly expands thermally and is sealed in the gap 3 between it and the outer cylinder 2, which is still a cold body. In order to compress the low melting point metal M which is still in a solid state, a large load is applied to the outer cylinder 1 via the low melting point metal M, which causes strength design problems such as breakage of the outer cylinder 1 and fatigue. There is a risk that this may occur. However, the above problem occurs until the low melting point metal M is melted, and once it is melted, the low melting point metal M becomes a fluid by the method already proposed by the present inventors in Japanese Patent Application No. 58-003716. A method can be used to release M to the outside of the roll.

This invention was created in view of the above problems.
The purpose of the present invention is to provide a double-tube vibration damping roll that solves the problem of strength in a simple manner.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 shows a front view including a partial cross section of the double-tube damping roll according to the present invention.

In the figure, reference numeral 1 denotes an inner cylinder, both ends of which are connected to a shaft end 4 by fitting, welding, or other means.
Further, the inner cylinder 1 is covered with a relatively thin outer cylinder 2 for the reason described above, and the same low melting point metal M as described above is filled in the gap 3 formed between the inner cylinder 1 and the outer cylinder 2. be done.

Further, the inner cylinder 1 is provided with conductive holes 6, 6' and communicated with the pipe 8 via retaining rings 7, 7' which also serve as seals. The pipe 8 is wound spirally around the circumference of the inner cylinder 1, and is continuously wound from one pipe end 8A to another pipe end 8B. Here, the pipe 8 may be fixed on the circumference of the inner cylinder 1 by welding or the like as appropriate. Pipe ends 8A, 8B
and the conductive holes 6, 6' may be fixed with retaining rings 7, 7' as in this example, the pipe 8 may be directly welded to the conductive holes 6, 6', or other well-known methods may be used. A combination method can be used. In addition, as for the pipe 8, instead of connecting the conduction holes 6 and 6' with a spiral piping on the outer periphery of the inner cylinder 1 as in this example, it is possible to make a short pipe by drilling a number of conduction holes 6 and 6'. Various piping methods can be considered, such as connecting with multiple piping, but
Basically, a pipe 8 is arranged in the gap 3, and both ends of the pipe 8 are connected to conductive holes 6, 6' made in the inner cylinder 1.
All you have to do is communicate with the .

Now, in equipment using the above-mentioned rolls, when the equipment is started up, the entire roll is likely to be at room temperature, but if heated steam is introduced into the roll hollow part C in this state, the inner surface of the inner cylinder 1 will be heated. At the same time, the heated steam is guided to the pipe 8 through the conduction holes 6, 6', so the pipe 8 is heated, rapidly heating the low melting point metal M in contact with the outer peripheral surface of the pipe 8, and also heating the low melting point metal M. Rapid heat transfer also occurs in the outer cylinder 2 which is in contact with the outer cylinder 2. Therefore, unlike conventional heat sources that exist only on the inner surface of the inner cylinder 1, heat is not transferred sequentially through the three layers consisting of the inner cylinder 1, the low melting point metal M, and the outer cylinder 2, but the heat source is located in the middle layer. Since the heat transfer conditions are also provided, the heat transfer conditions are significantly improved.

In other words, the temperature difference between the three layers becomes significantly smaller, and the difference due to thermal expansion of each layer becomes smaller, so that transient overload can be avoided.

Next, another embodiment of the present invention will be explained with reference to FIG. FIG. 3 shows a front view including a partial section. In this embodiment as well, the basic roll configuration, that is, the structural conditions of the inner cylinder 1, outer cylinder 2, and shaft end portion 4 are the same as described above. In this example, another method is proposed as the heating means provided in the gap 3. That is, the heater 9 is spirally wound around the outer peripheral surface of the inner cylinder 1, or
They are placed appropriately. The heater 9 may be of various types, but for example, a planar heating element with a central heating element made of nickel alloy foil covered with heat-resistant insulating layers on both sides is easily applicable. I think so.

The heater 9 can be attached in various ways, such as by attaching it to the outer circumferential surface of the inner cylinder 1 with a heat-resistant adhesive or by disposing a supporting member in the gap 3. Further, a lead wire 10 is discharged to the outside of the roll through a hole 11 made in the inner cylinder 1 and a hollow part C in order to connect the heater 9 to a power source for generating heat. Note that 12 is a seal plug for preventing the low melting point metal M from flowing out.

Now, regarding the function of this embodiment, when starting up equipment using this roll, before introducing heated steam into the roll hollow part C, the heater 9 is heated until the melting point of the low melting point metal M is reached. Low melting point metal M
A method is used in which the material is heated to melt it in advance. Once melted, the low melting point metal can be released to the outside of the roll by a method such as installing an accumulator as described above, thereby making it possible to prevent the phenomenon of fluid pressure increasing.

Thereafter, the roll may be heated by introducing heated steam into the hollow part C of the roll. The heater 9 may be used only as a preheating means, or may be used as a combined means for heating the roll during steady operation of the equipment.

If the double-tube damping roll according to the present invention is used as in the above-mentioned embodiments, problems regarding roll strength can be avoided and an excellent roll structure can be provided.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view showing a conventional double-tube type vibration damping roll, and FIGS. 2 and 3 are front views including partial cross-sections, respectively, showing an embodiment of the present invention. 1...Inner cylinder, 2...Outer cylinder, 6...Communication hole, 8...
...pipe, 9...heater.

Claims (1)

[Scope of utility model registration request] An outer cylinder is placed on the inner cylinder of the roll, and a low melting point metal that is solidified at room temperature and melts at high temperature is sealed in the gap formed between the inner cylinder and the outer cylinder. In a roll body into which steam for heating is introduced, a means for heating the low melting point metal is provided in a gap formed between the inner cylinder and the outer cylinder. A double-tube damping roll featuring: