JPH01153809A - Pressure roller - Google Patents

Abstract

PURPOSE:To aim at facility of the adjustment of a pressurizing force and bearing distribution on an object to be pressurized by providing a pressure roller consisting of a plurality of magnets having variable magnetic force arranged in the axial direction of a roll independently from each other. CONSTITUTION:A plurality of mutually independent pressure rollers 4 are provided in each roller shell of rolls 1, 2 rotating round respective shafts 5. Each pressure roller 4 has each shoe-like electromagnet which is fitted in contact with the inside face of each roller shell of the rolls 1, 2 for sliding along each holding portion 4b. The electromagnets 4a facing to each other in both rolls 1, 2 have mutually opposite magnetic polarities. Accordingly, the pressurizing force on an object 3 to be pressurized is generated between mutually opposite electromagnets 4a so that the pressurizing force and bearing distribution can be adjusted easily, in addition, roll shafts can be formed thin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure roll device used for rolling or dewatering products in paper machines, food machines, etc.

[Conventional technology]

In a conventional pressure roll device for rolling or dewatering a product, as shown in FIG. The structure is such that In this roll, the object to be pressed 3'
In order to adjust the surface pressure of the roller, as shown in the same figure, a method is used in which a crown is applied to the outer periphery of the roll using a plurality of roll pressurizing devices 4' that utilize pressure and pressure installed in the roll using hydraulic pressure. ing.

[Problem that the invention seeks to solve]

In the conventional device described above, surface pressure is applied to the object to be pressed by pressing the outer surface of the roll against the object to be pressed, so it is necessary to support the reaction force for pressing, and the roll shaft 5'
At the end, this pressing supports the reaction force. For this reason, the entire roll is always in a deformation mode that supports the reaction force at both ends, and even if adjustments are made using the pressure device 4', there will be no surface pressure distribution on the object to be pressed in the axial direction of the roll. It is extremely difficult to do so. In particular, as shown in FIG. 9, it has been empirically determined that a position approximately 1/4 of the length of the roll from both ends of the roll becomes a node in the surface pressure distribution, making it impossible to adjust the surface pressure. Also,
The shaft 5' needs to have a diameter sufficient to transmit the pressure reaction force.

Furthermore, in the conventional device, when the pressurized object 3' comes in with unevenness as shown in FIG. Since a surface pressure distribution is applied, the applied force is constant, and the pressed object 3' that has been rolled or dehydrated by the rolls becomes thinner overall while still having unevenness, as shown in Fig. 10 (B). It will come out in the same condition. This is a problem in the paper manufacturing industry, which requires products of uniform thickness.

The present invention attempts to solve these problems.

[Means for solving problems]

The present invention provides a pressure roll device equipped with a pair of rolls in which a roll pressure device is installed in at least one of the rolls, wherein the roll pressure devices are arranged in a plurality of roll pressure devices independently of each other and arranged in the axial direction of the rolls. Equipped with a magnet with variable magnetic force.

[Effect]

The present invention is equipped with a roll pressurizing device in which a plurality of mutually independent magnets with variable magnetic force are arranged in the axial direction within the roll shell, so by adjusting the magnetic force of the magnets, the roll acts on the object to be pressurized. Pressure force can be easily changed and adjusted. In addition, by adjusting the magnetic force of some of the magnets and adjusting the force acting on the roll by the roll pressure device in the axial direction, the crown on the outer periphery of the roll can be adjusted to create an arbitrary surface pressure distribution on the pressurized object. It is possible to easily apply a pressing force with .

Furthermore, when two magnets are used as each magnet in the pressurizing device and the ends with the same magnetic poles are arranged to face each other, in addition to the above-mentioned effect, the outer periphery of the roll due to the thicker part of the pressurized object is The repulsive force of the magnet is strengthened or weakened by moving the two rolls closer or farther apart according to the deformation, thereby applying a strong surface pressure to the thick part of the object to be pressed and a weak surface pressure to the thin part, A product with uniform thickness can be obtained.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

In this embodiment, rolls 1 and 2 each rotate around an axis 5.
A magnetic roll pressing device 4 having a plurality of independent electromagnets is provided inside the roll shell. In each of the pressurizing devices 4, a shell-shaped electromagnet 4a in contact with the inner surface of the roll shell of the roll 1.2 is slidably attached to a support portion 4b, and the support portion 4b is attached to the roll shaft 5. .

Further, the roll pressure device 4 of the roll 1 and the roll pressure device 4 of the roll 2 are provided to face each other as shown in the figure, and the electromagnet 4a of the roll pressure device 4 in the roll 1 and the roll pressure device 4 in the roll 2 are provided to face each other as shown in the figure. The portions of No. 4 facing the electromagnet 4a are configured to have opposite magnetic poles. In addition, the electromagnet 4
The coil a is connected to an electric wire outside the roll by wiring (not shown).

In this embodiment, the opposing electromagnets 4a and 4a of the roll pressurizing devices in the rolls 1 and 2 attract each other, so that the pressurized object passes through the rolls 1 and 2 via the rolls 1 and 2. Pressure force is applied to 3. Further, by changing the magnetization strength of all the electromagnets 4a, the pressing force acting on the pressurized object 3 can be adjusted. Furthermore, by changing the magnetization strength of some of the electromagnets 4a arranged in the axial direction of the rolls 1 and 2, the surface pressure distribution in the axial direction of the rolls can be adjusted.

Note that each of the above operations can be performed even while the roll is in operation by controlling the current flowing to the electromagnet 4a from outside the roll.

Furthermore, in this embodiment, the pressing force is generated between the opposing electromagnets 4a, and the roll shaft 5 does not need to transmit the pressing reaction force, so the coaxial shaft 5 can be made thinner.

FIG. 2 shows a second embodiment of the present invention, in which the roll pressure device 14 in the roll 2 has the same structure as in the first embodiment, and the roll pressure device 14 in the other roll 1 has the same structure as the first embodiment. device 14
' is provided with one electromagnet 14'a which is slidably attached to a support part 14'b fixed to the roll shaft 5 and extends over the entire length in the y direction of the roll shaft 1. The opposing portions of the electromagnet 14 of the roll pressing device 14 and the electromagnet 14'a of the roll pressing device 14' are configured in a 5IC configuration so as to have opposite magnetic poles as in the first embodiment. The electromagnets of the roll pressurizing devices 14, 14' are connected to electric wires outside the rolls by wiring (not shown).

In this embodiment, as in the first embodiment, the pressing force acting on the pressurized object 3 can be adjusted by changing the magnetization strength of the electromagnet of the roll pressurizing device 14, 14' during operation. At the same time, by changing the magnetization strength of some of the electromagnets of the roll pressurizing device 14, the surface pressure distribution in the roll axis direction can be adjusted, and the roll axis 5 can also be made thinner.

Further, the same functions and effects as described above can be obtained by using a magnetic material instead of an electromagnet for the portion of the roll pressurizing device 14' in the roll 1 that corresponds to the side of the electromagnet 14'.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, instead of the electromagnets in the first and second embodiments, cylindrical electromagnets are arranged in the axial direction of the roll.

In this embodiment as well, the same operations and effects as in the above-mentioned first and second embodiments can be achieved.

A fourth embodiment of the present invention will be described with reference to FIG. In this embodiment, mutually independent roll pressurizing devices are arranged in the axial direction of one of the rolls 2 rotating around the shaft 5.

The roll pressurizing device is attached to the shaft 5 by a support portion 34c. The roll pressurizing device also includes magnets 34a and 34b. The magnets 34a and 34b are a pair of electromagnets, or one is an electromagnet and the other is a permanent magnet, and opposing parts have the same magnetic pole.
The upper end of is placed so that it touches the inside of the shell of roll 2 [
There is. Further, the electromagnet is connected to a power source outside the roll by wiring (not shown).

In this embodiment having the above configuration, the magnets 34a, 34
b repel each other, thereby applying a pressing force to the roll shell by the magnet 34a, and applying a pressing force to the pressurized object 3 between the rolls.

As shown in FIG. 5, when a pressurized object 3 that is partially thick in the roll axis direction comes between the rolls, the magnets 34a * 34b of the roll pressurizing device in the thick part move closer to each other. In inverse proportion to this, the magnets 34a, 34
The repulsive force between b increases, and the pressure applied to the roll shell by the magnet 34a of the roll pressurizing device in that part increases, applying strong surface pressure to the thick part of the object 3 to be pressurized, and vice versa. When the pressure object 3 is in a thin part, the magnets 34a and 34'b
The distance between the magnets 34a and 34b becomes larger, the repulsive force between the magnets 34a and 34b decreases, and the surface pressure on the pressurized object 3 decreases. In this way, as shown in FIG. 6, the thickness of the pressurized object 3 can be corrected and made uniform. In addition, by changing the strength of the magnetic field 4t1 of the electromagnets among the magnets, it is possible to adjust the pressing force that acts on the pressurized object 3 during the operation of the roll, and the magnetic strength of some electromagnets can be adjusted. By changing , it is possible to adjust the surface pressure distribution in the axial direction of the roll during operation of the roll.

A fifth embodiment of the present invention will be explained with reference to FIG. This embodiment employs a magnet 44L attached to the inner surface of the roll shell of the roll 2 rotating around the roll shaft 5 in place of the magnet 34a of the fourth embodiment. The other magnet 441) has a structure similar to that of the fourth embodiment, and is attached to the a-rule shaft 5 via a support portion 44c.

Further, as in the fourth embodiment, the opposing portions of the magnets 44a and 441) have the same magnetic pole, and both of the magnets 44a and 44b are electromagnets, or one is an electromagnet and the other is a permanent magnet.

In this embodiment, one electromagnet 44a of the pressurizing device material is
rotates together with the roll 2, and due to the repulsive force generated between both magnets, the same actions and effects as in the fourth embodiment can be achieved.

〔Effect of the invention〕

In the present invention, the roll pressure device provided in at least one roll shell of a pair of rolls of the pressure roll device includes a plurality of variable magnetic force magnets arranged independently of each other in the axial direction of the rolls. As explained above in 1.
It is very easy to adjust the pressing force acting on the object to be pressed via the roll using the a-le pressure device, and also adjust the surface pressure distribution acting on the object to be pressed in the axial direction of the roll. be able to.

Furthermore, if the pressure applied to the pressurized object is changed depending on the thickness of the pressurized object, the flatness of the pressurized object can be corrected to make its thickness uniform, It is also possible to improve the quality of the product.

[Brief explanation of the drawing]

FIG. 1 (7! is an R sectional view of the first embodiment of the present invention,
Figure (B) is a side view of the same side, Figure 2 is a vertical cross-sectional view of the second embodiment of the present invention, Figure 3 (N is a vertical cross-sectional view of the third embodiment of the present invention, Figure 3 (B) ) is a side view of the same, FIG. 4(A) is a front view of a part of the fourth embodiment of the present invention in longitudinal section, FIG. 4(B) is an enlarged view of the main part of FIG. 4(A), Fig. 5 is an explanatory diagram of the operation of the embodiment, Fig. 6 is an explanatory diagram of the pressurized object pressurized by the embodiment, and Fig. 7 (N is the main part of the fifth embodiment of the present invention). 7 (B) is a side view of the same, FIG. 8 is an explanatory diagram of the conventional pressure roll device, FIG. 9 is an explanatory diagram of the operation of the conventional pressure roll device, and FIG. 10 (A ) and (B) are explanatory diagrams of the states of a pressurized object before and after rolling by a conventional pressure roll device, respectively. 1.2...roll, 3...pressurized object, 5・・・
・Roll axis, 4, 14.14', 24.34.44... Roll pressure device, 4a, 14'a, 34a, 34b,
44a, 44b-- Magnet.

Claims (1)

[Claims] In a pressure roll device equipped with a pair of rolls in which a roll pressure device is installed in at least one roll shell, the roll pressure device has a plurality of variable magnetic force independent of each other and arranged in the axial direction of the rolls. A pressure roll device characterized by being equipped with a magnet.