JP2587903Y2 - Crown control roll - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crown control roll used in a press or a calendar of a paper machine.

[0002]

2. Description of the Related Art As a conventional crown control roll of this type, there is an electromagnetic roll as shown in FIGS. That is, the conventional electromagnetic crown control roll a has a configuration in which a silicon pipe d is fitted around the outer periphery of a fixed shaft c supported by a fixed support portion b, and the plurality of electromagnets are divided around the outer circumference of the silicon pipe d. The body e is continuously fixed, and the lower half of each electromagnet body e is made small in diameter, and a plurality of cores g are respectively arranged and projected in the circumferential direction. A common coil wire h is wound to form each electromagnetic attraction part f, and the upper half of each electromagnet body e has a large-diameter plate shape, and a small gap S is kept outside the electromagnet body e. A roll shell (outer cylinder) i made of a magnetic material having an inner diameter to be disposed is disposed, and both ends of the roll shell i are rotatably supported on a fixed shaft c via a bearing j. h, a magnetic force is generated in the electromagnetic attraction unit f so that the electromagnetic attraction unit f is close to the electromagnetic attraction unit f. The roll shell i in which there is adapted to give imparted pressing force F pushing up the roll shell i upward attracted by suction force X. k is an annular space, l is a press roll, and m is a wet paper (JP-A-3-19948).
No. 2).

[0003]

However, in the above-mentioned conventional crown control roll a, the electromagnetic attraction part f is provided only below the fixed shaft c, and the roll shell i near the electromagnetic attraction part f is attracted to the roll shell i. Since the upward pressing force is applied to the shell i, the roll crown can be easily controlled and stable bending can be performed. However, the roll shell i is deformed by the suction force from one side. Due to the configuration, the fixed shaft c may be bent and deformed.

Therefore, the present invention is intended to prevent the deformation of the fixed shaft and to easily and variably control the crown amount at the nip point.

[0005]

According to the present invention, in order to solve the above-mentioned problems, an annular space is formed by rotatably supporting a roll shell on an outer periphery of a fixed shaft, and a fixed shaft of the annular space is formed on the fixed shaft. An electromagnetic attraction unit is provided by winding a coil wire around an iron core so as to be symmetrical with respect to the fixed shaft, and a ring made of a magnetic material corresponding to the electromagnetic attraction unit is provided on the inner peripheral surface of the roll shell. The roll shell is attached and deformed by being attracted to the electromagnetic suction unit at a symmetric position.

Further, it is preferable that cooling air is passed through the fixed shaft into the annular space to cool the electromagnetic attraction unit.

[0007]

When the coil wire of each electromagnetic attraction unit is energized, a magnetic force is generated at each electromagnetic attraction unit, so that the roll shell is attracted to the electromagnetic attraction unit at the symmetric position, and the roll shell is perpendicular to the symmetric position. It is deformed to swell. Thereby, the crown amount at the nip point of the roll can be controlled. Since the roll shell is symmetrically deformed by the attraction force of the electromagnetic attraction unit at the symmetric position, the fixed shaft can be prevented from bending. As the roll surface length increases, the deformation of the fixed shaft increases. Even in this case, the deformation of the fixed shaft can be prevented.

Further, when cooling air is supplied to the annular space to cool the electromagnetic attraction unit, heat generation of the electromagnetic attraction unit can be prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which a roll shell 3 and rotating parts attached to both ends thereof so as to form an annular space A around the non-rotating fixed shaft 1. 4 is disposed rotatably, and the fixed frames 5 integrated with both ends of the fixed shaft 1 rotatably support the rotating parts 4 at both ends via bearings 5a. An electromagnetic attraction unit 6 is provided on the fixed shaft 1 in the inside so that the roll shell 3 is attracted. More specifically, iron cores 7a and 7b are projected on the fixed shaft 1 in the annular space A symmetrically in the vertical direction at a required interval in the axial direction, and a coil wire 8 is connected to the iron cores 7a and 7b. A magnetic force is generated by energizing the coil wire 8 by winding, and an electromagnetic attraction unit 6 is configured to generate an attractive force, and the roll shell 3 of the roll body 2 rotatably supported on the fixed shaft 1 is formed. A plurality of rows of magnetic material rings 9 are attached to the inner peripheral surface so as to correspond to the plurality of electromagnetic attraction portions 6 at the respective symmetrical positions along the fixed shaft 1, and the inner surface of the ring 9 and the electromagnetic attraction portion 6
A small gap S between the iron cores 7a and 7b. The attachment of the magnetic material ring 9 to the inner peripheral surface of the roll shell 3 is performed by sequentially press-fitting the roll shell 3 from one end to the other end. For this purpose, as shown in FIG. 3, the inner peripheral surface of the roll shell 3 is shaped so as to have a step so as to gradually reduce the diameter from one end side to the other end side, and finish the inner surface of each step portion 3a. Then, rings 9 having different outer diameters are sequentially inserted and fitted to the inner surface of the corresponding step 3a. Each ring 9 has the same inner diameter, but one having a different thickness and a different outer diameter is prepared according to the inner diameter of each step 3a on the inner peripheral surface of the roll shell 3, and one end side of the roll shell 3 is prepared. From the press-fit type.

Holes 10a and 10b are formed in the shaft center of the fixed shaft 1 and open at both ends.
b and the annular space A are provided with holes 11 and 12 so that one hole 11 serves as an inlet for the cooling air CA and the other hole 12 serves as an outlet for the cooling air CA. The fixed shaft 1 is provided with a coil wire drawing hole 13 communicating with the hole 10b, and the coil wire 8 of the electromagnetic attraction unit 6 is guided to the outside through the inside of the fixed shaft 1 and connected to a power source (not shown). Let it do.

The crown control roll of the present invention having the above-described structure is used in a press or a calendar of a paper machine. When used, the crown control roll is arranged in a horizontal direction with other rolls. The nip point is located at a right angle, and the paper is used so that it passes vertically.

Now, when controlling the crown of the roll,
Power is supplied to the coil wire 8 of the vertically symmetric electromagnetic attraction unit 6 at an appropriate position from a power source, and a magnetic force is generated at the electromagnetic attraction unit 6.
As a result, an attractive force is generated in the electromagnetically attracting portion 6 which is vertically symmetrical, so that the adjacent ring 9 is attracted to the electromagnetically attracting portion 6 and the roll shell 3 integrated with the ring 9 is simultaneously moved up and down. As a result, the diameter of the roll shell 3 is reduced in the vertical direction.

When the roll shell 3 is attracted to the electromagnetic attraction unit 6 at a vertical position and deforms so that the diameter of the roll shell 3 is reduced, the roll shell 3 is expanded on both left and right sides of the position. . As a result, the crown amount at the nip point of the roll can be controlled, and the nip pressure can be changed.

During the crown control, the cooling air CA is supplied from one end of the fixed shaft 1 and introduced into the annular space A through the hole 11, and then is discharged from the hole 12 and discharged from the other end of the fixed shaft 1. By doing so, the electromagnetic attraction unit 6 is cooled by the cooling air CA, and heat generation of the electromagnetic attraction unit 6 is prevented.

In the crown control by the deformation of the roll shell 3, the present invention has the electromagnetic attraction unit 6 at the symmetrical position. Therefore, when the electromagnetic attraction unit 6 is operated to attract the roll shell 3, the fixed shaft is pulled. No deformation such as bending of 1 occurs. In the case where the length of the roll surface is long and the electromagnetic attraction part 6 is provided only on one side of the fixed shaft 1, the deformation of the fixed shaft 1 is further increased by the attraction force of the electromagnetic attraction part 6. Thus, the deformation of the fixed shaft 1 can be prevented.

In the above-described embodiment, the case where the electromagnetic attraction unit 6 is provided at a vertically symmetric position of the fixed shaft 1 has been described. Has shown that the rolls may be used by being stacked one on top of the other, and that a ring 9 made of a magnetic material is attached to the inner peripheral surface of the roll shell 3.
Is made of a magnetic material, the ring 9 can be omitted, and various changes can be made without departing from the scope of the present invention.

[0018]

As described above, according to the crown control roll of the present invention, the roll shell is rotatably supported outside the fixed shaft to form an annular space, and the annular shaft is formed on the fixed shaft in the annular space. An iron core is provided so as to be in a symmetrical position, and a coil wire is wound around the iron core to form an electromagnetic attraction portion.On the other hand, a ring made of a magnetic material corresponding to the electromagnetic attraction portion is provided on the inner peripheral surface of the roll shell. Attach and deform the roll shell by attracting the symmetrical position of the roll shell by the suction force of the electromagnetic suction unit. When the roll shell deforms, the roll shell expands in a direction perpendicular to the line connecting the symmetrical positions when the roll shell is deformed.By providing a nip point in this direction, the nip point The nip pressure can be changed by variably controlling the amount of rounding, and further, it is possible to achieve excellent effects such as preventing the coil of the electromagnetic attraction unit from generating heat by introducing cooling air into the annular space through the fixed shaft. .

[Brief description of the drawings]

FIG. 1 is a sectional view of the crown control roll of the present invention.

FIG. 2 is a view showing a deformation of a nip point of the crown control roll of the present invention.

FIG. 3 is a schematic view showing a cross section of a roll shell in the crown control roll of the present invention.

FIG. 4 is a sectional view of a conventional crown control roll.

FIG. 5 is a view in the direction of arrow V in FIG. 4;

[Explanation of symbols]

 Reference Signs List 1 fixed shaft 2 roll body 3 roll shell 4 rotating part 5a bearing 6 electromagnetic attraction part 7a, 7b iron core 8 coil wire 9 ring 10a, 10b hole 11, 12 hole A annular space

Claims (2)

(57) [Scope of request for utility model registration] 1. An annular space is formed by rotatably supporting a roll shell on the outer periphery of a fixed shaft, and a coil wire is formed on an iron core so as to be symmetrically positioned on the fixed shaft of the annular space with the fixed shaft interposed therebetween. Is provided, and a ring made of a magnetic material is attached to the inner peripheral surface of the roll shell so as to correspond to the electromagnetic suction unit, and the roll shell is attracted to the electromagnetic suction unit at a symmetrical position and deformed. A crown control roll, characterized in that 2. The crown control roll according to claim 1, wherein cooling air flows through the fixed shaft into the annular space.