JPS5853457Y2 - Cooling roll device - Google Patents

Description

[Detailed description of the invention] This invention has a double structure that has an outer cylinder part that cools the roll surface using the latent heat of vaporization of the liquid, and an inner cylinder part that can transfer heat to the outside by a circulating coolant. This invention relates to a cooling roll device.

There is a high demand for cooling rolls in various fields including the rubber industry, plastic industry, and printing industry.

For example, when molding a plastic film, if the entire surface is not cooled and rolled up almost uniformly, problems such as adhesion, uneven thickness, changes in surface gloss, and meandering during running may occur. Write.

In addition, in offset printing of wallpaper, etc., if the cooling after printing is not uniform, the shrinkage will be different, causing problems such as patterns not matching when pasting.

Furthermore, it is said that when ink is kneaded in the inking device of a printing press, the temperature rises by about 10-odd degrees Celsius.

The lower the ink temperature, the less abrasion occurs and the better the print quality. Therefore, some rolls in the inking device are provided with a cooling function to maintain the ink temperature at a predetermined constant value. Therefore, uneven cooling causes changes in the physical properties of the ink and causes uneven printing.

Conventional cooling rolls used in these applications are
The simplest method is a water-cooled type in which a coolant simply flows inside the roll.

However, in a cooling roll with this structure, the temperature of the water gradually rises along the path that the cooling water passes, resulting in a thermal gradient in the width direction of the roll, which has the serious drawback of not being able to cool the roll uniformly. .

Furthermore, as shown in Japanese Patent Publication No. 49-18857, the inside of the cooling port roll is kept at a reduced pressure, a thin film of water or other liquid is formed on the inner surface of the roll, and the liquid is continuously evaporated from the thin film. Cooling rolls configured to obtain a highly efficient cooling effect using latent heat of vaporization are also known.

The cooling roll with this structure is excellent in that it has a high cooling effect and can perform crab cooling, but according to the experience of actually manufacturing and using it, it is necessary to keep the amount of liquid inside the roll constant. Various other equipment is required, including a level meter and a vacuum rotary joint to maintain a vacuum state and connect to external equipment so that it can rotate freely.
It has disadvantages such as being mechanically complex and expensive9, causing many troubles during operation, and being troublesome to operate and maintain.

The purpose of this invention is to eliminate the drawbacks of the conventional technology as described above, to enable uniform cooling in the roll width direction, to be applicable regardless of the diameter, simple structure, long life, and easy operation and maintenance. An object of the present invention is to provide an improved cooling roll device that is simple and less prone to failure.

In order to achieve such an object, the cooling roll according to the present invention has a rotatably supported cooling roll whose interior is connected to a sealed outer cylinder part by a coaxially provided cylindrical partition wall.
It is completely divided into an inner cylinder part that can communicate with the outside using the shaft part, and a coolant supplied from the outside flows inside the inner cylinder, and the inside of the outer cylinder is kept in a reduced pressure state and has a small The structure is such that a large amount of liquid is sealed.

The roll surface is cooled using the latent heat of vaporization of the liquid in the outer cylinder, and the vapor is cooled and liquefied by the partition wall, and a coolant flows through the inner cylinder to cool the partition wall. be.

The features of the present invention are exactly in this configuration, and the above object has been achieved thereby.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

The cooling roll 1 has a structure in which a rotating shaft 2 passes through the center, and is rotatably supported by bearings 3a and 3b at both ends.

The inside of the cooling roll 1 is further divided into an outer cylinder part 5 and an inner cylinder part 6 by a cylindrical partition wall 4 provided coaxially.

The outer cylinder part 5 has a completely sealed structure, and the inside thereof is maintained at a reduced pressure, and a small amount of liquid 7 is sealed.

The degree of pressure reduction is determined by the roll temperature to be maintained and the liquid used.

As the liquid that can be used, for example, water may be used, or any other liquid such as fluorocarbons (among them, those having a low boiling point and being in a gaseous state at room temperature are called fluorocarbon gases) can be used.

This liquid is selected depending on the roll temperature to be maintained and the constituent material of the roll.

Furthermore, in this embodiment, the rotating shaft 2 also has a double structure of an inner tube 8 and an outer tube 9, one end of which is closed and the other end connected to an external cooling device 11 via a rotary joint 10. It is structured so that it can pass.

Here, the rotary joint 10 is a device that can connect the rotary shaft 2 that rotates and stationary piping in a state that prevents liquid leakage. The cooled coolant (usually water) flows through the rotary joint 10 into the inner tube 8 of the rotating shaft 2 and through the numerous through holes 12 at the end of the roll.
It enters the inner cylinder part 6 through the passage.

The coolant that has entered the inner cylinder section 6 flows in the opposite direction while cooling the partition wall 4, flows through the through hole 13 into the outer tube 9 of the rotating shaft 2, passes through the rotary joint 10, and is transferred to the external cooling device 11. Reflux to.

On the other hand, in the outer cylinder section 5, when the roll surface is heated, the thin film force of the liquid attached to the inner peripheral surface of the roll due to the rotational action evaporates in a state close to boiling because it is under reduced pressure, and the latent heat of vaporization at that time The rolls are cooled by

The steam adheres to the partition wall 4, is cooled and liquefied, becomes droplets and drips onto the inner peripheral surface of the roll, and heat exchange is performed in this cycle.

If only the coolant is flowing, roll width direction a.

The temperature at point bee has a temperature gradient such as c>b>a, but if the latent heat of vaporization of the liquid is used as described above, the temperatures at points e, f, and g are kept almost constant.

In addition, in the above embodiment, the force l that creates the air gap 14 between the inner tube 8 and the outer tube 9 of the rotating shaft 2 is to prevent heat exchange at that position. It is designed to enhance.

Reference numeral 15 in the figure is a sheet cooled by the cooling roll 1.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to such a structure. For example, the coolant is fed from one end of the rotating shaft through the rotary joint, and Similarly, it is also possible to adopt a configuration in which the coolant is increased via a rotary joint.

Since the present invention is a cooling roll device configured as described above, uniform cooling can be achieved without generating a thermal gradient in the width direction of the roll, and it can be manufactured regardless of the roll diameter. It has a simple structure and long life, is easy to operate and maintain, is less prone to breakdowns, has high cooling efficiency, and has many excellent practical effects, making it useful in the rubber industry, plastic industry, printing industry, and other industries. It can make significant contributions in various fields.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA. 1... Cooling roll, 2... Rotating shaft, 4
......Bulk wall, 5...Outer cylinder part, 6.
...Inner cylinder part, 7...Liquid, 10.
...Rotary joint, 11...Cooling device.

Claims (1)

[Scope of utility model registration request] The interior of the rotatably supported cooling roll is completely divided by a coaxial cylindrical partition into an outer cylinder part with a sealed structure and an inner cylinder part that can communicate with the outside using a shaft part. A cooling roll device in which a coolant supplied from the outside flows through the inner cylinder, the outer cylinder is maintained at a reduced pressure, and a small amount of liquid is sealed.