JPH0530196U - Expander roll - Google Patents

Abstract

(57) [Summary] [Objective] The present invention bends with a required curvature during normal operation,
It is an object of the present invention to provide an expander roll that does not return to a straight shape when the paper is passed and does not move the tail in the axial direction. [Constitution] The present invention is an expander roll in which a rubber roll or the like is fitted in a paper passage of a paper passing device of a paper machine in a direction orthogonal to the shaft and a large number of bearings around the shaft, and the expander roll is divided into approximately half in the axial direction. Extract and a pressing means for bending and straightening the shaft by exerting axially controllable pressing force on one of two parts of the divided shaft. Consists of a panda roll.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an expander roll provided in a paper passage of a paper passing device used in a paper machine so as to be able to pass a paper.

[0002]

[Prior Art]

 As an example of the paper path of a conventional paper machine, Fig. 4 shows the paper path in a size press provided with expander rolls. The paper from the paper roll 1 is coated with a size liquid or a liquid containing a pigment by a pair of top and bottom press rolls 3 of the gate roll size 2 and spread in the paper width direction by an expander roll 6 via a guide roll 4. And enters the dryer roll 7.

A conventional expander roll, more specifically, a fixed expander roll 6 has a bending shaft 8 having a constant bending rate and a bearing 9 around the bending shaft 8 as shown in the longitudinal section of FIG. It consists of a rotating rubber roll 10. When the paper is passed through the paper passage in which the expander roll 6 is installed, a tail (narrow paper) is placed on the end of the curved portion of the expander roll 6 in a normal paper machine.

[0004]

[Problems to be solved by the device]

 The above-mentioned conventional expander roll has the following problems to be solved.

That is, when the paper is passed through the paper path having the expander roll, the tail is placed on the end of the curved portion of the expander roll, and the tail is attached to the curved surface of the end. Therefore, there was a problem that it moved (or meandered) to the outside (end of the bending axis) and the tail was cut off, making it impossible to thread the paper.

In order to solve the above problems, the present invention provides an expander roll that is curved with a required curvature during normal operation, and returns straight when paper is passed, without moving the tail in the axial direction. The purpose is to

[0007]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention is an expander roll that is installed orthogonally to a paper passage of a paper machine of a paper machine and is fitted with rubber rolls and the like through multiple bearings around the shaft in the axial direction. It is provided with a shaft divided into approximately half and pressing means for bending and straightening the shaft by exerting axially controllable pressing force on one of the two parts of the divided shaft. The present invention provides an expander roll characterized by.

[0008]

[Action]

 Since the present invention is constructed as described above, it has the following effects.

That is, the shaft divided in half in the axial direction cannot be separated because it is surrounded by a large number of bearings. When an axial force is applied to one side of the shaft under such a condition, this approximates to the case where an unbalanced load is applied to one column, and as is well known, it is divided in the direction perpendicular to the axis. A force is generated and the column or axis bends. Therefore, the curvature of the bend can be controlled by controlling the pressing force, and the curvature of the expander roll can be controlled. As a result, if the pressing force is set to 0, the expander roll becomes straight, and otherwise the curved expander roll with the desired curvature is obtained within the elastic limit of the shaft. Therefore, it is used as a curved expander roll during normal operation of the paper passing device and as a straight expander roll during paper passing.

If the expander roll is straight, the tail does not move in the axial direction, so that the paper can be passed smoothly.

[0011]

【Example】

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

FIG. 1 is a diagram of a paper passing device 31 in which the expander roll 21 according to the present embodiment is used together with a pneumatic oil booster mechanism 23. The expander roll 21 has a detailed longitudinal sectional view and a controlled pushing force. Pneumatic oil boosters 23 for applying pressure are schematically shown.

FIG. 2 is a view showing a state in which the expander roll 21 of FIG. 1 is bent by the pressing force in the axial direction.

In FIG. 1, the central portion 22b of the expander roll 21 excluding the end portions 22a ₁ and 2 2a ₂ of the bending shaft 22 is axially divided into two portions 22c and 22d as shown. A rubber roll 10 similar to the conventional one is rotatably fitted around the curved shaft 22 via a number of bearings 9. When the pressure oil supplied to the hydraulic passage P provided in the end portion 22a ₁ acts on the end portion X of the portion 22c, it is equivalent to that an unbalanced load is applied to the bending shaft 22 in the axial direction. The portion 22c tries to bend in an arc shape, but the entire bending shaft 22 is constrained by the bearings 9 that are arranged on the bending shaft 22 in the axial direction, and the entire bending shaft 22 bends at a certain bending rate. Figure 2 shows that situation.

That is, when a prescribed hydraulic pressure acts on the end of the portion 22c, the bending shaft 22 has a prescribed bending rate, and when the hydraulic pressure does not act, the elastic force of the portions 22c and 22d, that is, the restoring force, causes a straight axis. . The pressure oil acting on the portion 22c is generated by the air-oil booster mechanism 23. The air-oil booster mechanism 23 includes a pressure reducing valve 24 for adjusting the pressure air supplied from an air supply source of compressed air to a constant pressure, a solenoid valve 25 for switching the three passages and two positions, a variable throttle valve (speed controller) 26, The air pressure acting on the air cylinder 29 of the air-hydraulic converter 28 by the demagnetization of the switching solenoid valve 25 which is composed of the check valve 27 and the air-hydraulic converter 28 and which is remotely operated by a push button is used as the pressure of the pressure reducing valve 24. , The hydraulic pressure generated in the hydraulic cylinder 30 is boosted by the sectional area ratio of both cylinders. Alternatively, the pressure oil discharged from the air cylinder 29 and acting on the portion 22c is made zero.

The paper passing device 31 is composed of the expander roll 21 and the pneumatic oil boosting mechanism 23, and an example in which the expander roll 21 is finally actuated to bend by hydraulic pressure is shown. The actuating force source for actuating the bending of the bending shaft is not limited to the hydraulic pressure. In short, if the axial force is controllably applied to the part 22c which is one side of the bending shaft 22, the bending shaft 22 will be moved to the position shown in FIG. As shown in the drawing, when the axial force disappears and the axial force disappears, it returns to a straight shape as shown in FIG. 1. Therefore, any means may be used as long as it is an operating force source that meets the purpose. For example, an electric jack or the like may be used.

As described above, when the paper machine is normally operated, hydraulic pressure is applied to the bending shaft 22 to bend the expander roll 21, and the expander roll 21 is bent to be used. If the expander roll 21 is changed to (0) to form a straight roll, there is an advantage that the tail does not move to the end of the expander roll 21 or meander.

[0018]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

That is, the axis of the expander roll can be bent and straightened, and the bending rate can be changed. Therefore, the bending rate is set to a specified value during normal operation and zero or close to zero when passing a sheet. By setting the curving rate, it can be operated as an expander roll during normal operation, and as a straight axis roll during paper passing, the tail of the paper can be smoothly guided to the paper passing path.

As a result, since there is no tail break in the curved portion of the expander roll as in the conventional case, the paper threading time can be shortened and labor can be saved.

[Brief description of drawings]

FIG. 1 is a diagram of a longitudinal section of an expander roll according to an embodiment of the present invention and a pneumatic oil booster mechanism for bending and straightening it.

FIG. 2 is a diagram showing a state in which the expander roll of FIG. 1 is curved,

FIG. 3 is a vertical sectional view of a conventional expander roll,

FIG. 4 is a schematic diagram of a paper path of a paper machine using a conventional expander roll.

[Explanation of symbols]

 9 Bearing 10 Rubber Roll 21 Expander Roll 22 Curved Shaft 22c, 22d Part 23 Pneumatic Oil Booster Mechanism

Claims (1)

[Scope of utility model registration request] 1. An expander roll in which a rubber roll or the like is fitted in a paper passage of a paper passing device of a paper machine in a direction orthogonal to the shaft through a number of bearings around the shaft and is divided into approximately half in the axial direction. An expander comprising a shaft and a pressing means for bending and straightening the shaft by exerting axially controllable pressing force on one of two parts of the divided shaft. roll.