JPH05800U - Super calendar - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a super calendar capable of performing stable calendar work by suppressing resonance of the main frame without further increasing the rigidity of the main frame. [Structure] Left and right main frames 4, 4 are tied beam 5
In a super calendar 8 having a frame structure 6 formed by connecting with each other, a vibration damping device 10 for damping the longitudinal resonance of the main frames 4, 4 and a lateral resonance of the main frames 4, 4 are damped. A vibration damping device 11 for shaking is provided on top of the frame structure 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a super calendar.

[0002]

[Prior Art]

 As shown in FIG. 3, a super calendar in a papermaking machine is equipped with a large number of metal rolls 1 and elastic rolls 2 that rotate at high speed. By passing the product (paper) 3 between these rolls 1 and 2, The smoothness and glossiness of No. 3 are improved.

In the above super calender, since many rolls 1 and 2 rotate at high speed, vibration is likely to occur, and this vibration has a problem that the quality of the product 3 is adversely affected.

Therefore, conventionally, the above-mentioned frame structure 6 is formed by connecting the left and right rigid main frames 4 and 4 which are formed to have a rectangular cross-sectional shape as shown in FIGS. 3 and 4 by a tie beam 5. The rolls 1 and 2 are firmly supported via the bearing 7.

However, as shown in FIG. 5, the main frames 4 and 4 have a natural frequency f _MD in the front-rear direction (MD direction) in the relatively high speed region of each of the rolls 1 and 2, and also each roll. Since the natural frequencies f _CD in the left-right direction (CD direction) are respectively provided in the relatively low speed regions 1 and 2, the dimension ratios of the main frames 4 and 4 in the front-rear direction and the left-right direction are set at the design stage. by adjust it, the width increases taken the longitudinal direction of the natural frequency f _MD and depends on the operating speed in the region L between the longitudinal direction of the natural frequency f _MD and transverse direction of the natural frequency f _CD One or both of the natural frequencies f _{CD in} the direction is not included so that the main frames 4 and 4 do not resonate with the vibration sources such as the rolls 1 and 2 during the operation.

[0006]

[Problems to be solved by the device]

However, in recent years, the speed and width of the rolls 1 and 2 of the super calendar have been increased, and one or both of the natural frequency f _{MD in the} front-rear direction and the natural frequency f _{CD in} the left-right direction in the operating speed region L. It has become extremely difficult to design the mainframes 4, 4 so that they will not fit in.

Therefore, it has been considered to prevent the resonance of the main frames 4 and 4 by increasing the rigidity of the main frames 4 and 4 more than before, but in that case, there is a problem that the cost is significantly increased. was there.

The present invention has been made in view of the above situation, and provides a super calendar capable of suppressing resonance of the main frame and performing stable calendar work without further increasing the rigidity of the main frame. The purpose is to do.

[0009]

[Means for Solving the Problems]

 The present invention relates to a super calender having a frame structure in which left and right main frames are connected by tie beams, and a vibration damping device for damping the longitudinal resonance of the main frame and the lateral resonance of the main frame. At least one of the damping devices for damping the vibration is controlled by the upper part of the frame structure depending on whether the natural frequency in the front-rear direction or the natural frequency in the left-right direction of the main frame exists within the operating speed range. It is characterized by being provided in.

[0010]

[Action]

 Therefore, in the present invention, even if one or both of the front and rear natural frequencies and the left and right natural frequencies of the main frame are included in the operating speed range of the super calendar, the resonance of the main frame in the front and rear direction is One or both of the left and right resonances are damped over the entire operating area by installing at least one of both vibration damping devices.

[0011]

【Example】

 Embodiments 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 the drawings, the same parts as those in FIGS. 3 and 4 represent the same parts.

In the super calender 8 configured almost the same as the super calender of FIGS. 3 and 4 described above, the mounting bases 9 and 9 are fixed to the upper part of the frame structure 6, that is, the upper part of the tie beam 5 in the illustrated example. , A vibration damping device 10 for damping front-rear resonance of the main frames 4, 4 is mounted on one mounting base 9, and a left-right resonance of the main frames 4, 4 is mounted on the other mounting base 9. The damping devices 11 for damping are provided respectively.

The vibration damping device 10 for damping the resonance of the main frames 4, 4 in the front-rear direction has piston portions 12, 12 at both ends in the axial direction, and the main frames 4, 4 are mounted on the mount 9. The movable mass 13 movably installed in the front-rear direction (MD direction) and the pistons 12, 12 are slidably fitted in the hydraulic mass 20 and the servo valve 14 is installed at a required place. Cylinder parts 16 and 16 capable of driving the movable mass 13 in the front-rear direction of the main frames 4 and 4 by the pressure oil 15 supplied and discharged via the above, and required positions above the main frames 4 and 4. And a command signal output from a control device 18 installed at a required location according to the longitudinal vibrations of the main frames 4 and 4 detected by the acceleration sensor 17. The servo valve 14 is adjusted by 19 and the movable mass 13 is relatively driven by hydraulic pressure so as to resist the vibration of the main frames 4, 4 in the front-rear direction, and the main frame is driven by the inertia reaction force generated by the drive. The vibrations in the front-rear direction of 4 and 4 can be damped.

Further, the vibration damping device 11 for damping the resonance of the main frames 4, 4 in the left-right direction is configured so that the movable mass 13 can be moved in the left-right direction (CD direction) of the main frames 4, 4. Others have the same configuration as the vibration damping device 10 described above, and the movable mass 13 is hydraulically driven to resist the vibrations of the main frames 4 and 4 in the left-right direction. The generated inertial reaction force can dampen the left and right vibrations of the main frames 4, 4.

Therefore, even if one or both of the natural frequency in the front-rear direction and the natural frequency in the left-right direction of the main frames 4 and 4 are included in the operating speed range of the super calendar 8, the main frame The resonance in the front-rear direction and the resonance in the left-right direction of 4 and 4 are respectively damped by the vibration damping devices 10 and 11.

Therefore, according to the above-described embodiment, the resonance of the main frames 4, 4 can be suppressed and stable calendar work can be performed without further increasing the rigidity of the main frames 4, 4.

It should be noted that the super calendar of the present invention is not limited to the above-described embodiment, but both damping devices may be installed on the main frame. As described above, in addition to the active type vibration damping device that actively drives the movable mass against the vibration of the vibration suppression target (frame structure), the movable mass is connected to the vibration suppression target by springs and dampers. A passive type vibration damping device that activates the mass passively with respect to vibration may be adopted, or a semi-active type vibration damping device that uses both active and passive types may be adopted. Of course, various changes can be made without departing from the scope of the present invention.

[0019]

[Effect of the device]

 According to the super calendar of the present invention, even if one or both of the natural frequency in the front-rear direction and the natural frequency in the left-right direction of the main frame are included in the operating speed range of the super calendar, One or both of the directional resonance and the left-right resonance can be damped by installing at least one of the vibration damping devices, so that the resonance of the main frame can be suppressed without further increasing the rigidity of the main frame. It is possible to obtain an excellent effect that the calender work can be suppressed and stable.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a view taken along line II-II in FIG.

FIG. 3 is a schematic diagram showing a conventional example.

4 is a view in the direction of arrows IV-IV in FIG.

FIG. 5 is a diagram showing a relationship between a mainframe vibration amplitude and a natural frequency in a conventional super calendar.

[Explanation of symbols]

 4 main frame 5 tie beam 6 frame structure 8 super calendar 10 vibration control device 11 vibration control device

Claims (1)

Claims for utility model registration: 1. In a super calendar having a frame structure in which left and right main frames are connected by tie beams, a vibration damping device for damping resonance of the main frame in the front-rear direction, A super calendar, wherein at least one of a vibration damping device for damping the resonance of the main frame in the left-right direction is provided on the upper portion of the frame structure.