JP2001303470A - Press roll - Google Patents

Press roll

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Publication number
JP2001303470A
JP2001303470A JP2000121624A JP2000121624A JP2001303470A JP 2001303470 A JP2001303470 A JP 2001303470A JP 2000121624 A JP2000121624 A JP 2000121624A JP 2000121624 A JP2000121624 A JP 2000121624A JP 2001303470 A JP2001303470 A JP 2001303470A
Authority
JP
Japan
Prior art keywords
cell
center shaft
static pressure
deflection
press roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2000121624A
Other languages
Japanese (ja)
Inventor
Hideto Abe
Kazukiyo Kono
Kiyoshi Nakano
Masashi Sasaki
Terubumi Tanimoto
清 中野
将志 佐々木
英人 安部
和清 河野
光史 谷本
Original Assignee
Mitsubishi Heavy Ind Ltd
三菱重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Ind Ltd, 三菱重工業株式会社 filed Critical Mitsubishi Heavy Ind Ltd
Priority to JP2000121624A priority Critical patent/JP2001303470A/en
Publication of JP2001303470A publication Critical patent/JP2001303470A/en
Withdrawn legal-status Critical Current

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Abstract

(57) [Problem] To provide a press roll capable of suppressing bending deformation of a center shaft and preventing damage due to direct contact between a cell and a static pressure shoe for pressurization. SOLUTION: A deflection correcting mechanism 11A, 11B is formed on a center shaft 1 at an angle with a surface on which a static pressure shoe 2 is arranged.
The deflection correcting mechanisms 11A and 11B correct the deflection of the center shaft 1 by the reaction force when the cell 3 is pressed from the inside in the radial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press roll provided in a paper machine or the like for dewatering a web between opposed counter rolls, and more particularly to a press roll capable of preventing a center shaft from being bent and deformed.

[0002]

2. Description of the Related Art FIGS. 5 to 7 are views showing the structure of a conventional press roll. FIG. 5 is a front sectional view (longitudinal sectional view).
6 and 7 are axial sectional views (transverse sectional views). In addition,
FIG. 6 and FIG. 7 show cases where the inclinations of the axes are different. FIG.
As shown in FIG. 7, the press roll 7 sandwiches a thin strip (web) 8 such as paper or felt at a predetermined pressure between the press roll 7 and the counter roll 5 installed opposite to each other, and This is a device that performs a dehydration process and a forming process of the web 8 by giving a nip pressure. The press roll 7 is configured such that a static pressure shoe (static pressure shoe for pressurization) 2 is disposed inside a cylindrical cell 3 forming an outer peripheral surface along an axial direction of a center shaft 1 serving as a rotation axis. . The center shaft 1 is supported at both ends while its rotation is restricted.
Are center shafts 1 at both ends via bearings 4 and 4.
It is supported rotatably. The web 8 is conveyed while being sandwiched between the outer peripheral surface of the cell 3 and the partner roll 5 at a predetermined nip pressure.

The static pressure shoe 2 is a means for adjusting the nip pressure between the outer peripheral surface of the cell 3 and the mating roll 5, and as shown in the sectional view of the main part of FIG. It is configured. The shoe piston 22 is fitted in a piston groove 23 provided in the center shaft 1 straight along the axial direction so as to be vertically movable via a metal seal 27 for lubricating oil sealing. Shoe body 20
Is an arc-shaped lubricating surface 21 along the inner peripheral surface of the cell 3
A plurality of shoe pockets 24 for storing lubricating oil are formed in the lubricating surface 21 as shown in FIG. An aperture 25 communicating with the bottom of the shoe piston 22 communicates with the shoe pocket 24.

[0004] Lubricating oil is supplied to the piston groove 23 from an oil supply pipe 9 installed inside the center shaft 1. The lubricating oil supplied into the piston groove 23 pushes up the shoe piston 22 toward the inner peripheral surface of the cell 3, fills the shoe pocket 24 through the throttle 25, and fills the lubricating surface 21 with the inner peripheral surface of the cell 3. An oil film is formed in the gap between the two. An oil film pressure is generated in the oil film, and when the cell 3 is stationary, a static pressure acts as the oil film pressure, and the cell 3
When is rotating, dynamic pressure also acts. Cell 3
Is pushed up by the lubricating surface 21 of the static pressure shoe 2 through this oil film, and opposes the pressing force of the mating roll 5.

[0005] The lubricating surface 21 from the shoe pocket 24
The lubricating oil supplied to the gap between the cell and the inner peripheral surface of the cell 3 flows out of the cell 3 from the tip end portion 26 of the lubricating surface 21. Then, after temporarily collecting in the lower portion of the cell 3, the center shaft 1
The oil is discharged to the outside by an oil drain pipe 10 installed inside, and is temperature-controlled by an oil supply device (not shown), and is again supplied from the oil supply pipe 9 to the piston groove 23.

By the way, in the press roll 7,
In order for the pressing force to be stably generated between the mating roll 5 and the cell 3 during rotation of the cell 3, several tens μm to several hundred μm are required between the lubricating surface 21 of the static pressure shoe 2 and the inner peripheral surface of the cell 3. It is necessary to keep the oil film thickness of. This oil film thickness is affected by various factors. For example, with respect to operating conditions such as the rotational speed of the cell 3 and the pressing force between the cell 3 and the other roll 5, various operating conditions such as low speed and low load, high speed and low load, and high speed and high load are satisfied. Generally, the higher the speed, the larger the oil film thickness due to the dynamic effect of rotation, and the higher the load, the smaller the oil film thickness. At low speeds, the dynamic effect is small, and the static pressure shoe 2 behaves as a pure static pressure shoe. Therefore, in the conventional press roll 7, the geometrical shape of each part of the shoe pocket 24, the throttle 25, the lubricating surface 21, and the inner peripheral surface of the cell 3 is designed so that a desired oil film thickness can be maintained under the above operating conditions. are doing.

As for the temperature of the lubricating oil to be supplied, generally, the higher the temperature, the lower the oil viscosity because the oil viscosity decreases, and conversely, the lower the temperature, the higher the oil viscosity and the higher the oil viscosity. Are increasing. As described above, since the temperature of the supplied oil has a great effect on the oil film thickness, the conventional press roll 7 supplies the discharged lubricating oil again after controlling the temperature within a predetermined temperature range.

[0008]

As described above, in the conventional press roll 7, the oil film thickness can be controlled to a predetermined value by designing the geometrical shape of each part according to the operating conditions or by controlling the temperature of the lubricating oil. To keep it in range. However, the factors that affect the oil film thickness are not limited to the above factors, and the relative positional relationship between the lubricating surface 21 of the static pressure shoe 2 and the inner peripheral surface of the cell 3, particularly the static pressure in the rotational direction of the cell 3 The positional relationship between the lubrication surface 21 of the shoe 2 and the inner peripheral surface of the cell 3 affects the oil film thickness.

For example, when the center shaft 1 is bent and deformed with respect to the cell 3, the static pressure shoe 2 supported by the center shaft 1 is also bent and deformed as shown in FIG. At this time, the relative position of the static pressure shoe 2 with respect to the cell 3 does not largely change at the axial end portion, whereas the static pressure shoe 2 moves in the axial direction of the cell 3 at the central portion in the axial direction as shown in FIG. By moving, the oil film thickness at the tip end portion 26 of the lubrication surface 21 decreases. In FIG. 11, the center line L1 indicates the center position of the normal static pressure shoe 2, and the center line L2 indicates the center position of the static pressure shoe 2 when the center shaft 1 is flexed and deformed. If the shift amount of the center position is within the allowable range, the bending of the static pressure shoe 2 is suppressed by the torsional force acting in accordance with the change of the oil film pressure, so that the oil film thickness at the front end portion 26 of the lubrication surface 21 is secured. However, if the deviation exceeds the allowable range, the oil film thickness cannot be secured, and the lubrication surface 2
The front end 26 of the first member comes into contact with the inner surface of the cell 3 and the lubricating surface 21 is seized.

The bending deformation of the center shaft 1 which causes the above-mentioned problems occurs due to the following reasons. First, the first cause is due to the inclination of the center shaft 1. For example, as shown in FIG. 6, when the center shaft 1 is inclined forward in the rotation direction of the cell 3, the center shaft 1 is inclined by its own weight or gravity acting on the static pressure shoe 2. It bends and deforms to the side where it is.

Further, both side surfaces 6A, 6A of the center shaft 1 are provided.
If there is a temperature difference between B, the center shaft 1 is warped in the axial direction due to the bimetal effect (the effect of the plate warping when there is a temperature difference between the front and back of the plate) due to the temperature difference. For example, when the temperature of the side surface 6A on the front side in the rotation direction of the cell 3 is higher than the side surface 6B on the rear side in the rotation direction, the center shaft 1 bends and deforms toward the front side in the rotation direction. Thus, the temperature difference of the center shaft 1 changes depending on the temperature difference between the temperature of the center shaft 1 itself and the lubricating oil temperature inside the cell 3 and the complicated motion state of the lubricating oil inside the cell 3. Since these states are affected by the rotation speed of the cell 2, the pressing force against the partner roll 5, the operation time and the stop time of the machine, etc., the state of the temperature difference generated between both side surfaces 6A and 6B of the center shaft 1 is considered. It is very difficult to predict.

Further, as shown in FIGS. 6 and 7, when another mating roll 51 different from the mating roll 5 on which the static pressure shoe 2 acts is provided, this other mating roll 51 is provided.
When the pressing force acts between the center shaft 1 and the center shaft 1 via the bearing 4 in the lateral direction, the center shaft 1 may be bent and deformed. Further, when the cell 3 rotates, a shearing force acts on the lubricating surface 21 of the static pressure shoe 2 in the rotating direction due to the viscosity of the lubricating oil. The shearing force also causes the center shaft 1 to bend and deform in the shearing direction. There is also a risk that

As described above, in the conventional press roll 7, there is a possibility that the center shaft 1 is bent and deformed due to various causes, and the oil film between the lubricating surface 21 of the static pressure shoe 2 and the inner peripheral surface of the cell 3 is formed. There is a problem in that the thickness cannot be secured within an appropriate range, and the lubricating surface 21 directly contacts the inner peripheral surface of the cell 3 to cause damage such as image sticking. As a solution to the above problem, for example,
As in the technique disclosed in Japanese Patent No. 27306, it is conceivable to divide the static pressure shoe for pressing into a plurality of pieces along the axial direction. This technique aims to finely control the axial nip pressure profile, but the static pressure shoes are divided in the axial direction so that each static pressure shoe can be Can rotate around. Therefore, even when the center shaft is bent, the oil film thickness between the lubricating surface of the static pressure shoe and the inner peripheral surface of the cell can be kept within an appropriate range by appropriately rotating each static pressure shoe. become able to. However, in this technique, it is necessary to provide a plurality of static pressure shoes, so that the cost is increased. Further, since the deflection of the center shaft is not positively suppressed, when the deflection is large, the above technique is used. However, there is a possibility that the lubricating surface directly contacts the inner peripheral surface of the cell.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is intended to suppress a bending deformation of a center shaft to prevent damage due to direct contact between a cell and a static pressure shoe for pressing. It is intended to provide roles.

[0015]

In order to achieve the above object, a press roll according to the present invention comprises a center shaft supported to be restricted in rotation, and a center shaft disposed around the center shaft and having both ends at the center. A cylindrical cell rotatably supported by a shaft, and a static pressure shoe for pressurization, which is disposed on the center shaft and slides on the inner peripheral surface of the cell via a fluid film, to face the traveling web. A press roll which is sandwiched between the counter roll and the cell and is pressed from the inside of the cell by the static pressure shoe for pressurizing, and the surface on which the static pressure shoe for press is arranged on the center shaft and at an angle. And a deflection correcting mechanism is provided to correct the deflection of the center shaft by a reaction force when the cell is radially pressed from the inside by the deflection correcting mechanism.

It is preferable that the deflection correcting mechanism is configured as a static pressure shoe for slidingly contacting the inner sliding surface of the cell via a fluid film and pressing the cell from the inside via the fluid film. The direction in which the deflection correcting mechanism is disposed is preferably perpendicular or substantially perpendicular to the surface on which the static pressure shoe for pressing is disposed, and the deflection correcting mechanism is provided on both sides of the surface on which the static pressure shoe for pressing is disposed. It is also preferable to dispose In particular, it is more preferable to dispose the deflection correcting mechanism on both sides of the disposing surface of the static pressure shoe for pressing in a direction perpendicular or substantially perpendicular to the surface.

It is preferable that the pressing force when the deflection correcting mechanism presses the cell from the inside is adjustable), and the deflection correction means is provided with a deflection detecting means for detecting the amount of deflection of the center shaft. More preferably, the pressing force can be automatically adjusted according to the amount of deflection of the center shaft. The deflection detecting means may directly detect the deflection of the center shaft by an eddy current displacement sensor or the like, and the fluid film thickness between the static pressure shoe for pressurization and the inner peripheral surface of the cell may be detected. May be detected.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a press roll according to a first embodiment of the present invention. First, the configuration of the press roll of the present embodiment will be described with reference to FIGS. 1 and 2, the same parts as those of the conventional press roll (FIGS. 5 to 11) are denoted by the same reference numerals in the drawings, and detailed description thereof will be omitted.

As shown in FIGS. 1 and 2, this press roll 15 has a pair of a static pressure shoe (static pressure shoe for pressurizing) 2 for pressurizing and dewatering the web with a mating roll. Correction Shoe 11A, 1 as Deflection Correction Mechanism
1B is provided. Deflection Correction Shoe 11A, 11B
As in the case of the static pressure shoe 2 for pressurization, along the axial direction of the center shaft 1, in the direction of the main axis A1 of the center shaft 1 (the direction of the surface on which the static pressure shoe 2 is disposed), and symmetrical directions. , Respectively, are disposed in a direction substantially perpendicular to the main axis A1 of the center shaft 1. Specifically, the center shaft 1 is provided on both side surfaces 6A and 6B of the center shaft 1.
The brackets 12A, 12B extending in a direction substantially perpendicular to the main axis A1 of the center shaft 1 from the axis of the center shaft 1 are provided straight along the axial direction of the center shaft 1, and the deflection correcting shoes 11A, 11B The brackets 12A and 12B are disposed at the distal ends along the axial direction.

The configuration of the deflection correcting shoes 11A, 11B is basically the same as that of the static pressure shoe 2 for pressurization, and comprises a shoe body 30 and a shoe piston 32. The shoe piston 32 is movably fitted up and down in a piston groove 33 provided along the axial direction at the tip of the brackets 12A and 12B. An arc-shaped lubricating surface 31 is formed on the upper portion of the shoe main body 30 along the inner peripheral surface of the cell 3, and a plurality of shoe pockets 34 for accumulating lubricating oil are formed in the lubricating surface 31. Note that, as described later, the deflection correcting shoes 11A and 11B do not support a load for dewatering the web unlike the static pressure shoe 2 for pressurization, and therefore, the static pressure smaller than the static pressure shoe 2 for pressurization. The shoe main body 30 is also configured as a shoe piston 32
Is formed smaller than the static pressure shoe 2 for pressurization.

An oil supply pipe 39 installed inside the center shaft 1 is connected to the piston groove 33, and lubricating oil discharged from a pump 35 installed outside the press roll 15 is supplied to the piston groove 33 through the oil supply pipe 39. The liquid is supplied into the groove 33. Then, the lubricating oil supplied into the piston groove 33 pushes up the shoe piston 32 toward the inner peripheral surface of the cell 3 and fills the shoe pocket 34 through a throttle (not shown) formed in the shoe piston 32, An oil film (fluid film) is formed in a gap between the lubrication surface 31 and the inner peripheral surface of the cell 3. As a result, the deflection correcting shoes 11A and 11B slide on the inner peripheral surface of the cell 3 via the oil film, and press the inner peripheral surface of the cell 3 in the radial direction via the oil film.

The temperature of the lubricating oil supplied to the piston groove 33 is controlled before and after the discharge from the pump 35. Further, the oil supply pipe 39 is provided with control valves 36 and 37 for adjusting the supply amount of lubricating oil. By opening and closing these control valves 36 and 37 to adjust the supply amount of lubricating oil, Each deflection correcting shoe 11A, 11B
Can adjust the pressing force when pressing the inner peripheral surface of the cell 3.

Next, the operation and effects of the press roll 15 as an embodiment of the present invention configured as described above will be described. As described above, the center shaft 1 has a bimetal effect due to a temperature difference with the internal lubricating oil and a temperature difference with the surrounding atmosphere, and the main shaft of the center shaft 1 (the direction in which the static pressure shoes 2 are disposed) is oriented in the direction of gravity. Various factors, such as the influence of the weight of the vehicle due to the inclination with respect to the contact angle and the contact force with another counter roll (see FIGS. 6 and 7) different from the counter roll (counter roll) on which the static pressure shoe 2 acts. Is caused by the bending deformation.

The bending deformation of the center shaft 1 acts so as to bring the central portion in the axial direction closer to the inner peripheral surface of the cell 3.
However, in the press roll 15, the center shaft 1
Are provided on the side surfaces 6A and 6B of the center shaft 1 with the deflection correcting shoes 11A and 11B which are in sliding contact with the inner peripheral surface of the cell 3 via an oil film. Suppress bending. That is,
When the correction shoes 11A and 11B press the inner peripheral surface of the cell 3 in the radial direction, a reaction force is generated in the opposite direction,
This reaction force acts in a direction that suppresses the bending deformation of the center shaft 1. Therefore, according to the present press roll 15, it is possible to suppress the bending deformation of the center shaft 1 and to prevent damage such as image sticking due to direct contact between the static pressure shoe 2 and the cell 3. Become.

In particular, in the press roll 15, since the correcting shoes 11A and 11B are disposed in a direction symmetric with respect to the direction in which the static pressure shoes 2 are disposed, the center shaft 1
Can be surely suppressed even if it is bent in any direction. The damage caused by direct contact between the static pressure shoe 2 and the cell 3 is caused by a component of the deflection of the center shaft 1 in a direction perpendicular to the direction in which the static pressure shoe 2 is disposed. Since the correction shoes 11A and 11B are disposed in a direction substantially perpendicular to the direction of the main axis A1 of the center shaft 1 (the direction of the surface on which the static pressure shoes 2 are disposed), the deflection of the center shaft 1 is reduced. Of these, components that affect the direct contact between the static pressure shoe 2 and the cell 3 can be effectively suppressed. Furthermore, static pressure shoe 2
Is substantially perpendicular to the pressing direction of each of the correction shoes 11A and 11B, so that the pressing force of the correction shoes 11A and 11B is controlled by the static pressure shoe 2 between the cell 3 and the mating roll. The influence on the nip pressure can be minimized.

Further, when adjusting the pressing force of the correcting shoes 11A, 11B by operating the control valves 36, 37, for example, the larger the amount of deflection of the center shaft 1, the greater the amount of supply of the lubricating oil and the more the correcting force. When the pressing force of the shoes 11A and 11B is increased, the reaction force of the pressing force can be increased, and the bending deformation of the center shaft 1 can be more effectively suppressed.

The center shaft 1 usually has its main shaft A
Since the bending rigidity is designed to be extremely large in one direction, the bending in the main axis A1 direction is extremely small, and the deflection correcting shoes 11A and 11B are attached to the cell 3 by the bending of the center shaft 1 in the main axis direction. There is no direct contact. Next, a press roll according to a second embodiment of the present invention will be described with reference to FIG. Note that FIG.
(A view taken in the direction of arrow II in FIG. 1 with cells omitted), and the same parts as those in the first embodiment are denoted by the same reference numerals.

The press roll 15 'according to the present embodiment
3 is characterized in that a deflection correcting shoe 11A as a deflection correcting mechanism is divided and provided in the axial direction of the center shaft 1, as shown in FIG. Specifically, the deflection correcting shoe 1 is limited to both axial end portions of the center shaft 1.
1A is provided. Although not shown, deflection correcting shoes (see FIG. 1) are disposed at both ends in the axial direction of the center shaft 1 at symmetrical positions of the deflection correcting shoes 11A with respect to the arrangement surface of the static pressure shoes 2. I have. The other configuration is the same as that of the first embodiment, and the detailed description is omitted here.

If a pressing force large enough to suppress the bending deformation of the center shaft 1 is ensured, the deflection correcting shoes 11A and 11B are provided over the entire width of the center shaft 1 as in the first embodiment. It is not necessary to dispose it, and it is possible to dispose it in a limited area like the press roll 15 '. Thereby, the press roll 1
5 'can be reduced in weight.

Next, a press roll according to a third embodiment of the present invention will be described with reference to FIG. In FIG. 4, the same parts as those in the above-described first and second embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. Press roll 15 ″ according to the present embodiment
As shown in FIG. 3, the basic configuration is the same as that of the first embodiment, but is characterized in that the pressing force of the deflection correcting shoes 11A and 11B can be automatically adjusted.

More specifically, in the press roll 15 ″,
An eddy current displacement sensor 13 is provided on one bracket 12A, and the eddy current displacement sensor (bending detection means) 13 measures a relative distance from the inner peripheral surface of the cell 3. When the center shaft 1 is bent, the relative distance between the eddy current displacement sensor 13 and the inner peripheral surface of the cell 3 changes. It can be detected.
The position of the eddy current displacement sensor 13 is preferably set to the position where the amount of deflection of the center shaft 1 is the largest, that is, the center portion in the axial direction in order to increase the measurement accuracy.

Cell 3 detected by eddy current displacement sensor 13
The relative distance to the inner peripheral surface of the controller is controlled by a control device (automatic adjustment means) 1
4 is output. The control device 14 controls the opening and closing of the control valves 36 and 37 to control each deflection correcting shoe 11.
A, 11B is a device for adjusting the supply amount of lubricating oil to the
The control valves 36 and 37 are opened and closed based on the relative distance from the inner peripheral surface of the cell 3 detected by the eddy current displacement sensor 13.

Specifically, when the relative distance from the inner peripheral surface of the cell 3 becomes small, the center shaft 1
Since it is bent to the side, the control valve 36 is controlled to supply lubricating oil to the correction shoe 11A. Then, as the relative distance from the inner peripheral surface of the cell 3 is smaller, the supply amount of the lubricating oil is increased, and the pressing force of the correcting shoe 11A is increased. Conversely, when the relative distance from the inner peripheral surface of the cell 3 increases, the center shaft 1 is bent and deformed toward the side surface 6B, so that the control valve 37 is controlled to supply lubricating oil to the correction shoe 11B. I do. As the relative distance from the inner peripheral surface of the cell 3 increases, the supply amount of the lubricating oil increases, and the correction shoe 1
Increase the pressing force of 1B.

Thus, in this press roll 15 ″,
The pressing force of the deflection correcting shoes 11A and 11B can be automatically adjusted (feedback control) based on the detection value of the eddy current displacement sensor 13, so that the deflection of the center shaft 1 is affected like the lubricating oil temperature. Even when the factor changes, it is possible to reliably suppress the bending of the center shaft 1.

As described above, three embodiments have been described as embodiments of the present invention. However, the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention. can do. For example, in each of the above-described embodiments, the deflection correcting shoes 11A and 11B are connected to the main shaft of the center shaft 1 (the surface on which the static pressure shoe 2 for pressurization is disposed) A
1, but the direction in which the deflection correcting shoes 11A and 11B are disposed is not limited to a right angle or a substantially right angle, and the deflection correcting shoes 11A and 11B are disposed at a certain angle with respect to the mounting surface of the static pressure shoe 2. What is necessary is just to have the angle of. As long as the center shaft 1 has a certain angle with respect to the surface on which the static pressure shoe 2 is provided, it is possible to suppress a component of the deflection of the center shaft 1 that affects the direct contact between the static pressure shoe 2 and the cell 3. Because you can.

In each of the above-described embodiments, the deflection correcting shoes 11A and 11B are provided on both sides of the static pressure shoe 2. However, the deflection directions are generally known, Is one direction, only the deflection correcting shoe for correcting the bending in that direction may be provided. In the above-described second embodiment, the deflection correcting shoes 11A are disposed at both axial ends of the center shaft 1, but may be disposed only at the axial central portion. That is,
There is no limitation on the disposition range of the deflection correcting shoe in the axial direction as long as the pressing force required to correct the deflection can be obtained.

In the third embodiment, the eddy current type displacement sensor 13 is provided as the deflection detecting means.
There is no limitation on the type or detection method as long as the deflection of the center shaft 1 can be detected directly or indirectly. For example, the oil thickness between the static pressure shoe 2 and the inner peripheral surface of the cell 3 may be detected. Further, the deflection detecting means may detect the amount of deflection of the center shaft 1 or may detect only the presence and direction of the deflection.

Further, in each of the above embodiments, the static pressure shoe (the deflection correcting shoes 11A, 11A) is used as the deflection correcting mechanism.
B) has been described, but the deflection correcting mechanism is provided on the center shaft 1 and corrects the bending of the center shaft 1 by a reaction force when the cell 3 is pressed from the inside in the radial direction. For example, it is not limited to the one that slides through an oil film (fluid film) like a static pressure shoe, but may be one that directly contacts the inner peripheral surface of the cell 3 like a rotating body such as a roller.

[0039]

As described above in detail, according to the press roll of the present invention, even if the center shaft attempts to bend and deform for some reason, the surface on which the pressurizing static pressure shoe is disposed on the center shaft and the angle The deflection correcting mechanism arranged in this way presses the cell in the radial direction from the inside, and the deflection of the center shaft can be corrected by the reaction force of the pressing force, so that the center shaft is prevented from being greatly bent and deformed. There is an advantage that damage due to direct contact between the cell and the static pressure shoe can be prevented (claim 1).

When the deflection correcting mechanism is configured as a static pressure shoe that slides on the inner sliding surface of the cell via a fluid film and presses the cell from the inside via the fluid film, even if the cell rotates at a high speed. There is an advantage that the cell can be stably pressed (claim 2). When the direction in which the deflection correcting mechanism is disposed is set to be perpendicular or substantially perpendicular to the surface on which the static pressure shoe for pressure is disposed, the deflection of the center shaft in the direction in which the cell and the static pressure shoe for direct contact are provided. In addition to being able to be suppressed most effectively, there is an advantage that the influence of the pressing force of the deflection correcting mechanism on the nip pressure between the cell and the counter roll can be minimized. If the straightening mechanism is arranged on both sides of the mounting surface of the static pressure shoe for pressurization, even if the center shaft bends to any side with respect to the mounting surface of the static pressure shoe for pressurization, it is surely secured. There is an advantage that it can be corrected (claim 4).

Further, when the pressing force when the bending correcting mechanism presses the cell from the inside can be adjusted, the pressing force can be adjusted according to the amount of bending of the center shaft. There is an advantage that the deflection of the center shaft can be reliably suppressed (claim 5). In particular,
If a deflection detecting means for detecting the amount of deflection of the center shaft is provided so that the pressing force can be automatically adjusted in accordance with the detected amount of deflection of the center shaft, the center shaft can be reliably adjusted even when the temperature condition changes. There is an advantage that the bending of the slab can be suppressed (claim 6).

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing a configuration of a press roll as a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow II in FIG. 1 with cells omitted.

FIG. 3 is a view showing a configuration of a press roll as a second embodiment of the present invention, and is a view corresponding to a view taken in the direction of an arrow II in FIG. 1 (FIG. 2) with cells omitted.

FIG. 4 is an axial cross-sectional view showing a configuration of a press roll as a third embodiment of the present invention, and is a diagram also showing a control system.

FIG. 5 is a front sectional view showing a configuration of a conventional press roll.

FIG. 6 is an axial cross-sectional view illustrating a configuration of a conventional press roll, and illustrates a case where a static pressure shoe for pressing is disposed in a vertical direction.

FIG. 7 is an axial sectional view showing a configuration of a conventional press roll, and is a view showing a case where a static pressure shoe for pressurization is disposed at an angle.

FIG. 8 is an axial sectional view showing a configuration of a static pressure shoe for press applied to a conventional press roll.

FIG. 9 is a view taken in the direction of the arrow IX in FIG. 8 with cells omitted.

FIG. 10 is a view for explaining the problem of the conventional press roll, and is a view corresponding to FIG. 9;

FIG. 11 is a diagram for explaining the problem of the conventional press roll, and is a diagram corresponding to FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Center shaft 2 Static pressure shoe (static pressure shoe for pressurization) 3 Cell 4 Bearing 5 Mating roll 6A, 6B Center shaft side surface 7 Conventional press roll 8 Web 9 Oil supply pipe 10 Oil drain pipe 11A, 11B Deflection correction shoe (Deflection correction) Static pressure shoe as mechanism) 12A, 12B Bracket 13 Eddy current displacement sensor (bending detection means) 14 Controller (automatic adjustment means) 15, 15 ', 15 "Press roll 20 Shoe body 21 Shoe lubrication surface 22 Shoe piston 23 Piston groove 24 Shoe pocket 25 Restrictor 26 Tip of shoe lubrication surface 27 Metal seal 30 Shoe body 31 Shoe lubrication surface 32 Shoe piston 33 Piston groove 34 Shoe pocket 35 Pump 36, 37 Control valve 51 Another mating roll

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kiyoshi Nakano 5007 Itozakicho, Mihara City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd.Paper & Printing Machinery Division (72) Inventor Masashi Sasaki 5007 Itozakicho, Mihara City, Hiroshima Prefecture In the Paper & Printing Machinery Division (72) Inventor Hideto Abe 5007, Itozakicho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries, Ltd.F-term in the Paper & Printing Machinery Division (reference) CE80 CG03 CG12 DA09 DA12 DA16 FA30

Claims (6)

[Claims]
1. A center shaft supported to be restrained from rotating, a cylindrical cell disposed around the center shaft and having both ends rotatably supported by the center shaft, and a cylindrical cell mounted on the center shaft. The cell is provided with a static pressure shoe for pressurized slidingly contacting the inner peripheral surface of the cell via a fluid film, and the running web is sandwiched between a counter roll installed opposite to the cell and the pressurizing shoe. A press roll pressurized from the inside of the cell by a static pressure shoe, wherein the press roll is disposed on the center shaft at an angle to a surface on which the pressurized static pressure shoe is disposed, and the cell is pressed radially from the inside. A press roll comprising a deflection correcting mechanism for correcting deflection of the center shaft by a reaction force of the press roll.
2. The method according to claim 1, wherein the deflection correcting mechanism is configured as a static pressure shoe that slidably contacts an inner sliding surface of the cell via a fluid film and presses the cell from the inside via the fluid film. Item 4. A press roll according to item 1.
3. The press roll according to claim 1, wherein the deflection correcting mechanism is disposed in a direction perpendicular or substantially perpendicular to a surface on which the static pressure shoe for pressure is disposed.
4. The deflection correcting mechanism is disposed on both sides of a surface on which the static pressure shoe for pressing is disposed.
3. The press roll according to any one of the above items 3.
5. The press roll according to claim 1, wherein the pressing force when the deflection correcting mechanism presses the cell from the inside in the radial direction is adjustable. .
6. A deflection detecting means for detecting an amount of deflection of the center shaft, and an automatic adjusting means for automatically adjusting the pressing force of the deflection correcting mechanism according to the amount of deflection of the center shaft detected by the deflection detecting means. 6. The press roll according to claim 5, comprising:
JP2000121624A 2000-04-21 2000-04-21 Press roll Withdrawn JP2001303470A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000121624A JP2001303470A (en) 2000-04-21 2000-04-21 Press roll

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Application Number Priority Date Filing Date Title
JP2000121624A JP2001303470A (en) 2000-04-21 2000-04-21 Press roll

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JP2001303470A true JP2001303470A (en) 2001-10-31

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007526951A (en) * 2004-03-05 2007-09-20 イーストマン コダック カンパニー Compliant pressure roller with uniform nip pressure
WO2009129047A3 (en) * 2008-04-15 2010-01-14 Honeywell International Inc. System and method for reducing current exiting a roll through its bearings
US8415595B2 (en) 2008-04-15 2013-04-09 Honeywell International Inc. System, apparatus, and method for induction heating using flux-balanced induction heating workcoil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007526951A (en) * 2004-03-05 2007-09-20 イーストマン コダック カンパニー Compliant pressure roller with uniform nip pressure
KR101147017B1 (en) 2004-03-05 2012-05-17 롬 앤드 하스 덴마크 파이낸스 에이에스 Compliant pressure roller with uniform nip pressure
WO2009129047A3 (en) * 2008-04-15 2010-01-14 Honeywell International Inc. System and method for reducing current exiting a roll through its bearings
US8415595B2 (en) 2008-04-15 2013-04-09 Honeywell International Inc. System, apparatus, and method for induction heating using flux-balanced induction heating workcoil

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