JPH0669298U - Crown control roll - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent deformation of the fixed shaft. [Structure] Iron cores 7a and 7b are provided at symmetrical positions of the fixed shaft 1. A coil wire 8 is wound around each of the iron cores 7a and 7b, and an electric current is passed through the coil wire 8 to generate a magnetic force to form an electromagnetic attraction portion 6. Electromagnetic suction unit 6
The roll shell 3 through the rotating portion 4 so as to cover the fixed shaft 1
It is rotatably arranged on the outer circumference of. A ring 9 made of a magnetic material is attached to the inner peripheral surface of the roll shell 3. The nip pressure is changed by enlarging the roll shell 3 in a direction perpendicular to the symmetrical position by attracting and deforming the roll shell 3 via the ring 9 to the electromagnetic attraction portion 6 located at the symmetrical position of the fixed shaft 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a crown control roll used in a press or calendar of a paper machine.

[0002]

[Prior art]

 As this type of conventional crown control roll, there is an electromagnetic type roll as shown in FIGS. That is, in the conventional electromagnetic type crown control roll a, a silicon circular tube d is fitted on the outer circumference of a fixed shaft c supported by a fixed supporting portion b, and a plurality of pieces are divided on the outer circumference of the silicon circular tube d. The electromagnet bodies e are continuously fixed, the lower half of each electromagnet body e has a small diameter, and a plurality of iron cores g are arranged side by side in the circumferential direction, and a plurality of iron cores g are arranged in the circumferential direction. To form an electromagnetic attracting portion f by winding a common coil wire h, and the upper half of each electromagnet body e has a large-diameter plate shape, and a slight gap S is provided outside the electromagnet body e. A roll shell (outer cylinder) i made of a magnetic material having an inner diameter to be held is arranged, and both ends of the roll shell i are rotatably supported by fixed shafts c via bearings j. By energizing the line h to generate magnetic force in the electromagnetic attracting portion f, the electromagnetic attracting portion f The roll shell i in proximity to attract by suction force X is that so as to impart a pressing force F pushing up the roll shell i upward. k is an annular space, l is a press roll, and m is a wet paper (Japanese Patent Laid-Open No. 3-199482).

[0003]

[Problems to be solved by the device]

 However, the above-mentioned conventional crown control roll a is provided with the electromagnetic attracting portion f only on the lower side of the fixed shaft c, attracts the roll shell i close to the electromagnetic attracting portion f, and pushes the roll shell i upward. Since the force is applied, there is an advantage that the roll crown can be easily controlled and stable bending can be performed. However, due to the structure in which the roll shell i is deformed by the suction force from one side, the fixed shaft c May bend and deform.

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

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention forms a ring-shaped space by supporting a roll shell on the outer periphery of a fixed shaft in a rotating manner, and has a symmetrical position on the fixed shaft of the ring-shaped space with the fixed shaft sandwiched therebetween. The coil is wound around an iron core to provide an electromagnetic attraction part, and a ring made of a magnetic material is attached to the inner circumferential surface of the roll shell so that the electromagnetic attraction part corresponds to the roll shell. It is configured to be attracted to and deformed by the electromagnetic attraction part.

Further, it is preferable that the electromagnetic suction portion is cooled by passing cooling air through the fixed shaft into the annular space.

[0007]

[Action]

 When the coil wire of each electromagnetic attracting part is energized, magnetic force is generated in each electromagnetic attracting part, so that the roll shell is attracted to the electromagnetic attracting part at the symmetrical position, so that the roll shell swells in the direction perpendicular to the symmetrical position. Is transformed into. This makes it possible to control the amount of crown at the nip point of the roll. Since the roll shell is deformed symmetrically by the attractive force of the electromagnetic attracting portion at the symmetrical position, it is possible to prevent the fixed shaft from bending. When the roll surface length becomes long, the deformation of the fixed shaft increases, but even in this case, the deformation of the fixed shaft can be prevented.

[0008] Further, if cooling air is caused to flow in the annular space to cool the electromagnetic suction portion, heat generation in the electromagnetic suction portion can be prevented.

[0009]

【Example】

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

FIG. 1 and FIG. 2 show an embodiment of the present invention, in which a roll shell 3 and a rotating portion attached to both ends thereof so as to form an annular space A on the outer periphery of a non-rotating fixed shaft 1. The roll body 2 composed of 4 and 4 is rotatably arranged, and the rotating portions 4 at both ends are rotatably supported by the fixed frames 5 integrated at both ends of the fixed shaft 1 through bearings 5a. The electromagnetic attraction part 6 is provided on the fixed shaft 1 in the space A so that the roll shell 3 is attracted. More specifically, the fixed shaft 1 in the annular space A is provided with iron cores 7a and 7b which are vertically symmetrically projecting from each other at a predetermined interval in the axial direction, and the coil wire 8 is provided on the iron cores 7a and 7b. Is wound around and a magnetic force is generated by energizing the coil wire 8 to generate an attractive force, and the roll shell 3 of the roll body 2 rotatably supported by the fixed shaft 1 is constructed. A plurality of rows of rings 9 made of a magnetic material are attached to the inner peripheral surface of the ring 9 so as to correspond to the plurality of electromagnetic attracting portions 6 located at respective symmetrical positions along the fixed shaft 1, and the inner surface of the ring 9 and the electromagnetic attracting portion 6 are attached. A slight clearance S is maintained between the iron cores 7a and 7b. The ring 9 made of a magnetic material is attached to the inner peripheral surface of the roll shell 3 by sequentially press-fitting from one end side to the other end side of the roll shell 3 and fitting them. Therefore, as shown in FIG. 3, the inner peripheral surface of the roll shell 3 is stepped so that the diameter gradually decreases from one end side to the other end side, and the inner surface of each step 3a is finished. Then, the rings 9 having different outer diameters are sequentially inserted and fitted to the inner surface of the corresponding step portion 3a. Each ring 9 has the same inner diameter, but different thicknesses and different outer diameters are 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.

Further, holes 10a and 10b are formed at both ends of the shaft center of the fixed shaft 1, and holes 11 and 12 are formed to connect the holes 10a and 10b to the annular space A, respectively. One hole 11 serves as an inlet for the cooling air CA, the other hole 12 serves as an outlet for the cooling air CA, and a coil wire for communicating with the hole 10b is connected to the fixed shaft 1 near each electromagnetic suction portion 6. A hole 13 is bored so that the coil wire 8 of the electromagnetic attracting portion 6 is guided to the outside through the inside of the fixed shaft 1 and is connected to a power source (not shown).

The crown control roll of the present invention configured as described above is used in a press or calendar of a paper machine. When used, the crown control roll is arranged horizontally with other rolls, and the line that connects the electromagnetic attracting portions 6 at symmetrical positions is used. Make sure that the nip point is at the right angle and that the paper passes vertically.

To control the roll crown, the coil wire 8 of the vertically symmetrical electromagnetic attracting portion 6 at an appropriate position is energized from a power source to generate a magnetic force in the electromagnetic attracting portion 6. As a result, an attracting force is generated in the electromagnetic attracting portion 6 which is vertically symmetrical, so that the ring 9 in the adjacent portion is attracted to the electromagnetic attracting portion 6, and the roll shell 3 integrated with the ring 9 simultaneously moves up and down. Since the roll shell 3 is attracted to the electromagnetic attraction portion 6, the diameter of the roll shell 3 is reduced in the vertical direction.

When the roll shell 3 is attracted to the electromagnetic attracting portion 6 at a vertical position and deformed 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 amount of crown at the nip point of the roll can be controlled, and the nip pressure can be changed.

During the above crown control, cooling air CA is supplied from one end of the fixed shaft 1 to be introduced into the annular space A through the hole 11 and then discharged from the hole 12 from the other end of the fixed shaft 1. By discharging the electromagnetic suction portion 6, the electromagnetic suction portion 6 is cooled by the cooling air CA, and heat generation of the electromagnetic suction portion 6 is prevented.

In the crown control by the deformation of the roll shell 3, the present invention has the electromagnetic attracting portion 6 at the symmetrical position. Therefore, when the electromagnetic attracting portion 6 is operated and the roll shell 3 is attracted, it is fixed. There is no deformation such as bending of the shaft 1. When the length of the roll surface is long, if the electromagnetic suction part 6 is only on one side of the fixed shaft 1, the deformation of the fixed shaft 1 will increase more and more due to the suction force of the electromagnetic suction part 6. According to this, deformation of the fixed shaft 1 can be prevented.

In the above-described embodiment, the case where the electromagnetic attraction portion 6 is provided at the vertically symmetrical position of the fixed shaft 1 has been shown, but the position is not limited to the vertical position, and any symmetrical position may be used. In this case, the rolls should be used one above the other, and the case where the ring 9 made of a magnetic material is attached to the inner peripheral surface of the roll shell 3 is shown. The roll shell 3 is made of a magnetic material. Of course, the ring 9 can be omitted, and various changes can be made without departing from the scope of the present invention.

[0018]

[Effect of device]

 As described above, according to the crown control roll of the present invention, the roll shell is rotatably supported on the outside of the fixed shaft to form the annular space, and the symmetrical position is provided on the fixed shaft in the annular space. An iron core is provided on the core, and a coil wire is wound around the iron core to form an electromagnetic attraction section.On the other hand, 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 attraction section. Because the symmetric position of the roll shell is attracted and deformed by the attraction force of the roll shell, when the roll shell is attracted and deformed by the electromagnetic attracting portion on the fixed shaft, the fixed shaft is not deformed. When the roll shell is deformed, the roll shell expands in the direction at right angles to the line connecting the symmetrical positions.Therefore, by providing the nip point in this direction, the crown of the nip point is set. Can be changed variably controlled to nip pressure can be further prevent heat generation of the coil of the electromagnetic attraction part by introducing cooling air into the annular space through the fixed shaft, an excellent effect like.

[Brief description of drawings]

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

FIG. 2 is a view showing the deformation of the 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 cross-sectional view of a conventional crown control roll.

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

[Explanation of symbols]

 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)

[Scope of utility model registration request] 1. A coil wire is formed on an iron core so that a roll shell is rotatably supported on the outer periphery of a fixed shaft to form an annular space, and the iron core is symmetrically positioned on the fixed shaft of the annular space with the fixed shaft sandwiched 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 part, and the roll shell is attracted to the electromagnetic suction part at a symmetrical position to be deformed. A crown control roll characterized by being formed as follows. 2. The crown control roll according to claim 1, wherein cooling air is caused to flow through the fixed shaft into the annular space.