JPS6049418B2 - single facer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A single facer is a device that processes a core paper 1 into a corrugated shape and adheres a liner 2 thereto to continuously produce one-sided corrugated holes 3.

Next, explaining the manufacturing process, the core paper 1 is heated and humidified from a mis-roll stand using a preheat roll and a moisturizer (all not shown), and then guided to the upper roll 4. After that, the core paper 1 is transferred to the upper roll 4 and the lower roll 5.
It is inserted between the steps and forms a corrugated step (step machining). The corrugated core paper 1 thus formed into a corrugated shape is pasted at the top of the corrugation with a gluing roll 6, and pressed and stuffed onto a liner 2 guided by a pressure roll 7 to produce a single-sided corrugated board 3. Ru. In the single facer, which manufactures the single-sided corrugated board 3 by utilizing the rotation of the three rolls, the upper roll 4, the lower roll 5, and the pressure roll 7, the teeth formed on the surface of the lower roll 5 are The structure is such that the steps of the shape strike the pressure roller 7, and an excitation force corresponding to the number of tooth passages at the closing point and its harmonics is applied.

Therefore, this excitation force is received by the shell portion 8 of the pressure roll 7 shown in FIG. 2, and is propagated to a support structure (not shown) such as a bearing that supports the journal portion 9.

On the other hand, the excitation force is received by the lower roll 5 as a reaction force, and together with the meshing force between the upper roll 4 and the lower roll 5, the upper roll 4
and propagates to the support structure that supports the roll 4. In this way, the entire single facer vibrates and simultaneously generates noise. That is, in the general single facer shown in FIG. 1, the upper roll 4 and the lower roll 5 engage with each other to press and pack the corrugated core paper 1 onto the liner paper 2. An exciting action corresponding to the number of passing teeth and its harmonics occurs at the engaging portion of the Corolla 7.

As shown in FIG. 4, this state is the case where the top of the corrugated portion of the lower corrugated roll 5 overlaps with the line connecting the axes of the lower corrugated roll 5 and the pressure roll 7 (conditions 10a and 11), and the case where the bottom portion of the corrugated portion is located on the line connecting the axes of the lower corrugated roll 5 and the pressure roll 7. (state 10b, 1''), the maximum axis displacement δ occurs.

Due to the above-mentioned periodic excitation, the pressure roll 7 and the lower roll 5
The single facer itself, such as the upper roll 4 and its surroundings, vibrates, and noise (solid sound) is generated accordingly. In particular, at the resonance point (when the eigenvalue of the single facer itself matches the excitation frequency), the upper roll, the lower roll 5, and the pressure roll 7 undergo very large relative vibrations.
Depending on the conditions, the core paper sandwiched between the upper roll 4 and the lower roll 5 may be damaged, and the single-sided corrugated sheet 3 sandwiched between the lower roll 5 and the pressure roll 7 may be damaged.

In addition, the noise at the resonance point became extremely loud, and was approximately 1 (b) (4) higher than the level at other points, posing problems from the viewpoint of the working environment and pollution. In addition, 10 in FIG. 1 is a stage, 12 is a doctor roll, and 13 is a glue container. Cracks in the liner between the lower roll and the pressure roll, poor lamination, and cracks in the core paper between the two rolls are important problems with single facers, and are often caused by the vibrations mentioned above.

Therefore, the inventors of the present invention have focused on the fact that suppressing vibration can eliminate these problems, and have arrived at the present invention as a vibration suppressing measure. That is, the basic feature of the present invention is that a mass element having a damping effect due to collision is disposed in the hollow part of the pressure roll or upper roll of the single facer, and the gap with the cage that is subject to collision by the mass element is easily reduced. The outer diameter of the mass element and the ke. The inner diameter of the roll is tapered, and the mass element can be moved by a connecting member from the outside of the roll.The mass element is sealed inside the vibrating body and acts as a resistor against external vibrational force, reducing vibration. What aims to achieve a damping effect is generally called an impact damper, which applies so-called impact mass to a single facer.

One of the major conditions for effectively utilizing the collision mass to reduce vibration is how to set the clearance between the cage and the mass element (the collision gap between the mass elements).

Clearance determination (
Even if the optimal structural clearance for the mass element (not adjustable) is established through theoretical analysis or several tests, subtle changes in the mechanical properties of the single facer as a vibration system (for example, corrugated rolls) The only way to deal with ``changes in spring constant due to wear of the pressure roll'' and changes in clearance due to wear of the cage or mass element is to replace the cage or mass element. Therefore, according to the present invention, the clearance can be adjusted from the outside of the roll. Being able to adjust freely means having great flexibility.The present invention will be explained below with reference to the embodiments shown in the drawings. Fig. 3 shows a vibration model diagram according to the present invention, and in order to better understand the present invention, In the figure, M1 is the mass of the upper roll, M2 is the mass of the lower roll, M3 is the mass of the pressure roll,
Kl and K2 to K5 are spring constants of each part, C1 to C5 are damping constants, and Ml and m2 are internal collision masses.

The vibration model diagram of the present invention shown in FIG. 3 is different from the conventional vibration model in that a collision mass is built inside the pressure roll and the upper roll 4.

FIG. 3 shows the concept of suppressing the vibration of the same masses M1 and M3 by colliding the collision mass M2, ml inside the roll with the cage and resisting the vibration of the masses M1 and M3.
If the same mass M2,ml is not interpolated, it indicates that the vibration of the roll is not suppressed. FIGS. 5A, 5B, and 5C show a single facer roll (upper roll and/or pressure roll) structure showing an embodiment of the present invention.

Figure 5 A, C]! There is also a steam vent 1 inside the collision mass 15.
7 is provided, FIG. 5C shows a case in which a steam hole 17a is provided on the outer diameter portion of the collision mass 15, so that drain processing is facilitated. Also, 8 in the figure is a roll shell, 1
4 is a cage, 16 is a connecting member, and 18 is a clearance between the cage and the internal damper. There is a cage 14 fixed to the inner wall of the roll shell 8 by welding, keys, etc., and a collision mass 15 is located inside the cage 14 .

The collision mass 15 may be provided with a hole 17 for ventilating heated steam, and the collision mass 15 may be bent so that the collision clearance can be adjusted by an operation from outside the roll. A connecting member 16 whose rigidity is sufficiently smaller than that of the roll is attached. This clearance 18 is actually several tens to several hundred μm.
Another feature of the present invention is that the inner diameter of the cage 14 and the outer diameter of the collision mass 15 have the same slope (taper).

By adopting such a structure, the clearance 18, which is the lifeblood of the collision mass effect, can be adjusted from the outside, and can be freely adjusted within a certain clearance range. Therefore, with the collision mass 15 incorporated, it is easy to search for and set the optimum clearance according to the vibration characteristics of the actual machine. Further, adjustments can be made in the same way depending on aging of the machine, changes in vibration characteristics, and operating conditions (type of seat, pressing force, etc.). The size of the collision mass 15 is generally determined as a percentage of the vibration equivalent mass of the roll system. For example 2-3%
It is often around 20%. During operation, the impact mass 15 impacts the cage 14.

The degree of collision depends on the magnitude of the vibration of the roll (and cage); if the vibration is small, the two will just touch each other, and if the vibration is large, the two will collide violently. In this case, collision sound is generated as the collision mass 15 collides with the cage 14, but since the sound source is inside the roll, the sound is insulated by the thickness of the roll.
Almost no sound leaks from the roll to the outside. Further, the collision vibration is suppressed and attenuated by the friction between the roll shell portion 8 and the cage 14, and its propagation to the outside becomes extremely small. FIG. 6 shows an embodiment in which the present invention is applied to an upper roll or a pressure roll, in which the collision mass 15 can be moved toward the center by a moving plate 20 and moved in the opposite direction by a moving plate 19. A plate 20 is attached to the connecting member 16, and a plate 19 is further attached through the through hole of the collision mass 15.

Further, the collision mass 15 is moved by rotating the adjustment handle 21, and is based on the axial movement of the connecting member 16 due to the engagement of the inner diameter thread of the handle 21 with the outer diameter thread of the connecting member 16. Note that 22 indicates a seal ring. FIG. 7 shows another embodiment in which the present invention is applied to an upper roll or a pressure roll, in which a fixed shaft 23 is fixed to the left and right journal parts 9 along the roll axis, and is slidable on the fixed shaft 23. An impact mass 15 is installed via a spring element (spring, etc.) 24 which is .

In order to move the collision mass 15, the collision mass 15 is engaged with threads of the connecting shafts 25' and 26 via a connecting nut 30. If the connecting shafts 25 and 26 are threaded in opposite directions, they can be moved toward each other and in the opposite direction.

Further, the shaft is connected at various locations by connecting members 27. This is because when the collision mass 15 acts as a damper,
Although it vibrates in the direction perpendicular to the axis, this is to alleviate the vibration load and reduce wear and tear on the adjustment mechanism. Note that the connecting member 2
A suitable structure for 7 may be a universal joint or the like. In addition, in the figure, 28 is an adjustment handle, and 29 is a set screw. Fig. 8 is a line diagram showing the vibration measurement results of a single facer with a conventional structure, and Fig. 9 is a line diagram showing the vibration measurement results tested for the embodiment device of Fig. 6, both of which are for the upper roll and lower roll. , the vibration acceleration of each bearing part of the pressure roll was measured against the line speed.
Only the vicinity of the resonance point is shown.

That is, the vibration of 44g at the resonance point in the conventional structure was reduced by 20y according to the present invention, indicating that a damping effect of 112 or more was achieved. The collision mass used in this test was a mass ratio (collision mass/roll) of approximately 0.1 and a clearance of 0.26 wun. Here, the O mark in FIGS. 8 and 9 is the pressure roll, Δ
The mark indicates the lower roll, and the ● mark indicates the upper roll. Since the present invention is constructed as described in detail above, when the roll body undergoes lateral vibration (bending vibration, etc.), the collision mass collides with the inner surface of the cage on the side opposite to the vibration due to inertial force. By repeating this repeatedly, the effect of suppressing the vibration of the roll body can be demonstrated.

Since vibration can be reduced in this way, noise is naturally also reduced.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a conventional general single facer, Fig. 2 is an enlarged side view of a partial cross section of the pressure roll in Fig. 1, and Fig. 3 is a vibration model diagram to which the present invention is applied. , FIG. 4 is an explanatory view showing the bonded state of the lower roll and pressure roll in FIG. 1, and FIG. Side view, 5th
Figure C3! Fig. 5A is a cross-sectional view taken along line A-A in Fig. 5A, Fig. 5C is a front view of a colliding mass different from the mouth, and Figs. 6 and 7 are a part showing the roll structure of an embodiment different from Fig. A cross-sectional side view, FIG. 8 is a diagram showing the results of vibration measurement using a conventional single facer, and FIG. 9 is a diagram showing the results of vibration measurement using a single facer showing an embodiment of the present invention. Explanation of the main parts of the figure, 8...Roll shell, 1
4...Cage, 15...Collision mass, 1
6... Connection member, 19, 20... Moving plate, 21... Adjustment handle.

Claims (1)

[Claims] 1. Single-face corrugated board that continuously produces one-sided corrugated board by corrugating the core paper with a pair of upper and lower rotating corrugating rolls, and laminating the core paper and liner with a rotating pressure roll in pressure contact with the lower corrugating roll. a cage whose inner diameter gradually decreases toward the center in the axial direction of the roll is disposed on the inner wall of at least one roll shell of each of the rolls;
A truncated cone-shaped collision mass whose generating line has the same inclination as the change in the inner diameter of the cage is disposed inside the cage so as to be movable in the radial direction, and the collision mass is movable from the outside of the roll in the direction of the roll axis. Single facer featuring.