JP7596892B2 - Vibration damping structure - Google Patents

Description

The present invention relates to a vibration damping structure.

Conventionally, in order to reduce vibrations caused by equipment and machinery that vibrate during operation, a vibration-proof structure has been known in which, for example, a rubber-like elastic plate is placed on the top surface of a slab, a thick plate-like foundation is placed on top of the rubber-like elastic plate, the thick plate-like foundation and the rubber-like elastic plate are connected, and the equipment and machinery are placed on the thick plate-like foundation (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 09-177093

However, vibration isolation structures such as those in Patent Document 1 only shift the resonance peak between the natural frequency of the thick plate foundation on which equipment and machinery are placed and the natural frequency of the ground, and have a small effect on damping vibrations, meaning that there is an issue in that sufficient damping performance cannot be ensured.

The present invention was made in consideration of these problems, and its purpose is to provide a vibration damping structure with higher vibration damping performance in a vibrating structure.

In order to achieve this object, the vibration damping structure of the present invention comprises:
A vibration damping structure for damping vibration of a vibration structure provided on a support structure,
The support structure includes a horizontal portion provided under the vibration structure;
a rising portion rising from the horizontal portion;
having
the vibration structure has an opposing portion facing the rising portion with a gap therebetween in a horizontal direction,
A vibration isolating part is provided on the horizontal part,
a relative displacement attenuation mechanism that is fixed to the rising portion and the opposing portion and that attenuates the relative displacement between the rising portion and the opposing portion ,
The relative displacement damping mechanism includes:
The present invention is characterized in that it has a viscoelastic portion fixed to each of the rising portion side and the opposing portion side .

According to this type of vibration damping structure, the vibration structure is provided on the horizontal part of the support structure via vibration isolation, and a relative displacement damping mechanism is provided between the rising part of the support structure and the opposing part of the vibration structure that faces it with a horizontal gap. The vibration isolation part shifts the resonance peak between the natural frequency of the vibration structure and the natural frequency of the support structure, and the relative displacement damping mechanism damps the displacement of the vibration structure relative to the support structure, thereby damping vibration. This makes it possible to provide a vibration damping structure with higher vibration damping performance in the vibration structure.

Furthermore, the viscoelastic portion fixed between the rising portion side and the opposing portion side can attenuate the displacement of the vibrating structure relative to the supporting structure, thereby more reliably attenuating vibrations.

In such a vibration damping structure, the vibration structure has a shaft protruding from the opposing portion toward the rising portion, an opposing surface material that faces the rising portion with a gap therebetween and to which the viscoelastic portion is fixed, an arm extending laterally from the opposing surface material, and a rotating portion provided at the tip of the arm and supported rotatably by the shaft, forming a rotating body integral therewith, and the support structure has a support portion that stands upright from the horizontal portion and supports the rotating body at its top on which the arm portion is placed, and the length of the arm portion from the top to the opposing surface material side is longer than the length from the top to the rotating portion side.

According to this type of vibration damping structure, the rotating body is rotatably supported on the opposing part via an arm extending laterally, and the arm is supported on the top of the support part that stands upright from the horizontal part of the support structure. Therefore, when the vibration structure is displaced downward relative to the support structure, the arm is pushed upward by the support part. At this time, the rotating body rotates around the axis and the opposing surface material is displaced upward. Also, when the vibration structure is displaced upward relative to the support structure, the arm is displaced downward relatively together with the support part. At this time, the rotating body rotates around the axis and the opposing surface material is displaced downward.

As a result, the vibration is damped by the viscoelastic part interposed between the rising portion and the opposing surface material as the vibration structure and the support structure are displaced relative to each other in the vertical direction. At this time, the length of the arm part placed on the support part from the top of the support part to the opposing surface material is longer than the length from the top of the support part to the rotating part side, so that the opposing surface material is displaced by a greater amount than the relative displacement between the vibration structure and the support structure due to the lever action. As a result, it is possible to increase the damping force by displacing the arm part more than when the viscoelastic part is directly provided between the rising portion and the opposing portion.

In this vibration damping structure, the rising portion has a rising surface material that faces the opposing surface material with a gap therebetween, and the viscoelastic portion is fixed to each of the rising surface material and the opposing surface material.

According to such a vibration damping structure, it is possible to damp vibrations by the viscoelastic portion interposed between the rising portion surface material and the opposing portion surface material.
Also, there is provided a vibration damping structure for damping vibration of a vibrating structure provided on a support structure, the support structure having a horizontal portion provided below the vibrating structure and a rising portion rising from the horizontal portion, the vibrating structure having an opposing portion facing the rising portion at a horizontal interval, the support structure being provided on the horizontal portion via a vibration-proof portion, and having a relative displacement damping mechanism fixed to the side of the rising portion and the side of the opposing portion, respectively, for damping relative displacement between the rising portion and the opposing portion, the vibrating structure being a machine foundation on which an apparatus that vibrates during operation is installed.

The present invention provides a vibration damping structure that has higher vibration damping performance.

1 is a vertical cross-sectional view showing a vibration damping structure according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. 1. 3 is a vertical cross-sectional view showing a relative displacement damping mechanism provided in the vibration damping structure according to the present embodiment. FIG. FIG. 4 is an exploded perspective view showing a configuration of a relative displacement damping mechanism. FIG. 13 is a diagram showing a state in which the vibration structure is displaced upward. FIG. 13 is a diagram showing a state in which the vibrating structure is displaced downward.

The vibration damping structure according to one embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the vibration damping structure according to this embodiment includes a machine foundation 1 as a vibration structure on which a device (not shown) that vibrates during operation, such as a rotary press, is installed, a pressure plate 2 as a support structure having a pit 2a in which the machine foundation 1 is placed, a vibration-isolating part 3 interposed between the horizontal part 2b forming the bottom of the pit 2a and the machine foundation 1, and a relative displacement damping mechanism 4 provided between the side of the pit 2a (hereinafter referred to as the pit side) 2c and the side of the machine foundation 1 (hereinafter referred to as the foundation side) 1a.

The machine foundation 1 is a rectangular foundation with a flat surface on which the equipment is placed, and the pressure plate 2 is a concrete structure installed on the ground.

The pit 2a in the pressure plate 2 is rectangular in plan view and large enough to accommodate the machine foundation 1. The machine foundation 1 is fixed onto a sheet-like vibration isolation part 3, such as vibration isolation rubber, provided on the horizontal part 2b of the pit 2a.

The machine foundation 1 is placed in the center of the pit 2a in the horizontal plane, and when placed on the horizontal part 2b via the vibration isolation part 3, the four foundation sides 1a of the machine foundation 1 face the four pit sides 2c of the pit 2a at approximately the same intervals. Here, the pit sides 2c correspond to the rising parts that rise from the horizontal part, and the foundation sides 1a correspond to the opposing parts that face the rising parts at a horizontal interval.

In this embodiment, the upper surface of the machine foundation 1 and the upper surface of the pressure plate 2 are installed on approximately the same horizontal plane. Two relative displacement damping mechanisms 4 are arranged side by side on the foundation side surface 1a, which is the long side of the machine foundation 1, which has a rectangular shape in a plan view, as shown in FIG. 2. In the following explanation, the horizontal direction is described as the left-right direction along the long side of the machine foundation 1 in a plan view, and the direction along the short side of the machine foundation 1 is described as the depth direction.

As shown in Figures 3 and 4, each relative displacement damping mechanism 4 has a foundation side member 5 provided on the foundation side 1a, a pit side member 6 provided on the pit side 2c, a viscoelastic part 7 interposed between the foundation side member 5 and the pit side member 6, and a support pillar 8 as a support part erected from the horizontal part 2b of the pit 2a.

The foundation side member 5 has a foundation base plate 50 that is fixed facing the foundation side surface 1a, a shaft 51 that protrudes horizontally from the foundation side surface 1a toward the opposing pit side surface 2c and passes through the foundation base plate 50, and a rotating body 52 that is supported by the shaft 51 so as to be freely rotatable.

The rotating body 52 is arranged approximately parallel to the foundation side surface 1a and the pit side surface 2c, and has two opposing surface members 53, 54 that face each other, a top surface member 55 that connects the upper ends of the two opposing surface members 53, 54 and has an extension portion 55a that extends toward the foundation base plate 50, an arm portion 56 that extends in the left-right direction from the top surface member 55, and a rotating portion 57 that is provided at the extended tip of the arm portion 56 and through which the shaft 51 passes.

The rotating body 52 is supported so that it can rotate freely with the shaft 51 inserted through the rotating part 57, and the foundation base plate 50 and the opposing surface material 53 on the foundation base plate 50 side are arranged with a gap between them, and a space is formed under the extension part 55a.

The pit side member 6 has a pit base plate 60 fixed facing the pit side surface 2c, a first facing member 61 facing the pit base plate 60 with a gap therebetween, a second facing member 62 facing the first facing member 61 with a gap therebetween, and a bottom member 63 protruding from the surface of the pit base plate 60 facing the foundation side surface 1a and connecting the bottom ends of the first facing member 61 and the second facing member 62.

When the foundation side member 5 is provided on the foundation side 1a of the machine foundation 1 and the pit side member 6 is fixed to the pit side 2c of the pressure plate 2, as shown in FIG. 3, the second facing member 62 is disposed between the foundation base plate 50 and the facing surface member 53 on the foundation base plate 50 side, and the first facing member 61 is disposed between the two facing surface members 53, 54. Here, the first facing member 61 and the second facing member 62 correspond to the rising surface members that face the facing surface member with a gap between them.

A viscoelastic portion 7 is interposed between the surface 62a of the second opposing material 62 on the side of the first opposing material 61 and the opposing surface material 53 on the side of the foundation base plate 50, and a viscoelastic portion 7 is interposed between both surfaces 61a of the first opposing material 61 and the two opposing surface materials 53, 54.

As shown in FIG. 2, the support column 8 is erected from the horizontal part 2b of the pressure plate 2 and is located under the arm 56 of the rotating body 52 supported by the shaft 51. The support column 8 has a rectangular shape in a plan view that is long in the direction along the shaft 51, and is provided with a roller 8a at the upper end that rotates around an axis parallel to the shaft 51. The arm 56 of the rotating body 52 supported by the shaft 51 is placed on the support column 8. The arm 56 of the rotating body 52 supported by the top 8b of the support column 8 with the arm 56 placed on the support column 8 is set so that the arm 56 is horizontal. Therefore, in the relative displacement damping mechanism 4, when there is no relative displacement between the machine foundation 1 and the pressure plate 2, the rotating body 52 is supported and installed with the arm 56 horizontal.

When the machine foundation 1 is displaced upward due to vibration of the device installed on the machine foundation 1, the rotating part 57 supported by the shaft 51 protruding from the machine foundation 1 is displaced upward together with the machine foundation 1. At this time, as shown in FIG. 5, the rotating part 57 supported rotatably on the shaft 51 becomes higher than the top 8b of the support column 8 on which the arm 56 is supported, so the rotating body 52 rotates around the shaft 51 so that the opposing surface members 53 and 54 are lower than the top 8b of the support column 8.

At this time, the amount of vertical displacement on the opposing surface member 53 side, which is a long distance from the top 8b of the support column 8 serving as the fulcrum, is greater than the amount of vertical displacement on the rotating part 57 side, which is a short distance from the top 8b of the support column 8. In other words, the amount of vertical relative displacement L2 at the center of the opposing surface member 53, or the amount of displacement L3 of the upper edge corner 7a on the opposite side to the axis 51 in the viscoelastic part 7 interposed between the opposing surface member 53 and the first opposing material 61 and second opposing material 62, is greater than the amount of vertical relative displacement L1 between the machine foundation 1 and the pressure plate 2.

When the machine foundation 1 is displaced downward due to vibration of the device installed on the machine foundation 1, the rotating part 57 supported by the shaft 51 protruding from the machine foundation 1 is also displaced downward together with the machine foundation 1. At this time, as shown in FIG. 6, the rotating part 57 supported rotatably on the shaft 51 becomes lower than the top 8b of the support column 8 on which the arm 56 is placed and supported, so the rotating body 52 rotates around the shaft 51 so that the opposing surface material 53 side becomes higher than the top 8b of the support column 8.

At this time, the amount of vertical movement on the opposing surface member 53 side, which is a long distance from the top 8b of the support column 8 serving as the fulcrum, is greater than the amount of vertical displacement on the rotating part 57 side, which is a short distance from the top 8b of the support column 8. In other words, the amount of vertical relative displacement L2 at the center of the opposing surface member 53, or the amount of displacement L3 of the upper edge corner 7a on the opposite side to the axis 51 in the viscoelastic part 7 interposed between the opposing surface member 53 and the first opposing material 61 and second opposing material 62, is greater than the amount of vertical relative displacement L1 between the machine foundation 1 and the pressure plate 2.

In this way, the displacement of the opposing surface material 53 and the first and second opposing materials 61 and 62 is greater than the vertical relative displacement amount L1 between the machine foundation 1 and the pressure plate 2, and the viscoelastic portion 7 provided between the opposing surface material 53 and the first and second opposing materials 61 and 62 is greater, so that the vibration damping effect is enhanced compared to when a viscoelastic portion is simply provided between the machine foundation 1 and the pressure plate 2.

According to the vibration damping structure of this embodiment, a vibration-proof part 3 is provided between the horizontal part 2b of the pressure plate 2 and the machine foundation 1, and a relative displacement damping mechanism 4 is provided between the pit side 2c of the pressure plate 2 and the foundation side 1a of the machine foundation 1, which faces the pit side 2c of the pressure plate 2 and is spaced apart in the depth direction. The vibration-proof part 3 shifts the natural frequency of the machine foundation 1 including the device from the resonance region and lengthens the period, and the relative displacement damping mechanism 4 damps the displacement of the machine foundation 1 relative to the pressure plate 2, thereby damping the vibration.

More specifically, for example, a device installed on the machine foundation 1 generates various vibrations of 2 to 50 Hz, and by fixing the device to the machine foundation 1, the natural frequency becomes approximately 30 Hz, and by placing the vibration isolation part 3 under the machine foundation 1, the natural frequency becomes approximately 19 Hz. After lowering the natural vibration to a band where the effect of the viscoelastic part 7 is easily exerted, the vibration itself can be damped by the relative displacement damping mechanism 4. In other words, it is possible to provide a vibration damping structure with higher vibration damping performance in the machine foundation 1.

Furthermore, the opposing surface members 53 and 54 are rotatably supported on the foundation side surface 1a via arms 56 extending laterally, and the arms 56 are supported by support columns 8 erected from the horizontal portion 2b of the pressure plate 2. Therefore, when the machine foundation 1 is displaced downward relative to the pressure plate 2, the arms 56 are pushed upward by the support columns 8. At this time, the rotating body 52 supported by the shaft 51 rotates around the shaft 51, and the opposing surface members 53 and 54 are displaced upward.

When the machine foundation 1 is displaced upward relative to the pressure plate 2, the arm 56 is displaced downward relative to the support column 8. At this time, the rotating body 52 rotates around the axis 51, and the opposing surface members 53, 54 are displaced downward. Therefore, as the machine foundation 1 and the pressure plate 2 are displaced in the vertical direction, vibrations are damped by the viscoelastic part 7 interposed between the pit side surface 2c and the foundation side surface 1a.

At this time, the length L4 of the arm 56 placed on the support column 8 from the top 8b of the support column 8, which is the placement position, to the opposing surface materials 53, 54 is longer than the length L5 from the top 8b of the support column 8 to the shaft 51, so that the lever action displaces the opposing surface materials 53, 54 more than the relative displacement between the machine foundation 1 and the pressure plate 2. This makes it possible to damp vibrations more efficiently than when the viscoelastic part 7 is provided directly between the pit side surface 2c and the foundation side surface 1a.

The above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit the scope of the present invention. The present invention may be modified or improved without departing from the spirit of the invention, and it goes without saying that the present invention includes equivalents.

In the above embodiment, an example was described in which a relative displacement damping mechanism 4 is provided in which a viscoelastic part 7 is interposed between a foundation side member 5 that is rotatably arranged between the pit side surface 2c and the foundation side surface 1a and a pit side member 6 that is fixed to the pit side surface 2c. However, the present invention is not limited to this. For example, a foundation side member in which a foundation base plate and an opposing surface member are integrally formed is fixed to the foundation side, and a viscoelastic part is provided between this opposing surface member and the first and second opposing materials of the pit side member, or a viscoelastic part is provided directly between the foundation side surface and the pit side surface.

In the above embodiment, an example was described in which the relative displacement damping mechanism 4 is provided between the foundation side 1a and the pit side 2c along the left-right direction of the machine foundation 1, but it may also be provided between the foundation side 1a and the pit side 2c along the depth direction of the machine foundation 1. It may also be provided between the foundation side 1a and the pit side 2c along the left-right direction of the machine foundation 1, and between the foundation side 1a and the pit side 2c along the depth direction of the machine foundation 1.

Furthermore, the relative displacement damping mechanism provided between the pit side and the foundation side may be any damper capable of damping vibrations, such as an oil damper.
In the above embodiment, an example has been described in which the vibration structure is the machine foundation 1 and the support structure is the pressure plate 2, but the present invention is not limited to this.

1. Machine foundation (corresponding to a vibrating structure)
1a Foundation side (corresponding to the opposing part)
2 Pressure plate (corresponding to the support structure)
2a Pit 2b Horizontal part 2c Pit side (corresponding to the rising part)
3 Vibration-isolating portion 4 Relative displacement damping mechanism 5 Foundation-side member 6 Pit-side member 7 Viscoelastic portion 7a Upper edge corner portion 8 Support column (corresponding to the support portion)
8a Roller 8b Top 50 Foundation base plate 51 Shaft 52 Rotating body 53 Facing surface material 54 Facing surface material 55 Top surface material 55a Extension 56 Arm 57 Rotating part 60 Pit base plate 61 First facing material (corresponding to rising surface material)
61a: both sides of the first facing material; 62: second facing material (corresponding to the rising surface material);
62a: Surface of the second opposing member on the side of the first opposing member 63: Lower surface member L1: Relative displacement amount L2: Relative displacement amount L3: Displacement amount L4: Length from the top of the support column in the arm portion to the opposing surface member side,
L5: the length of the arm from the top of the support column to the side of the rotating part,

Claims (4)

A vibration damping structure for damping vibration of a vibration structure provided on a support structure,
The support structure includes a horizontal portion provided under the vibration structure;
a rising portion rising from the horizontal portion;
having
the vibration structure has an opposing portion facing the rising portion with a gap therebetween in a horizontal direction,
A vibration isolating part is provided on the horizontal part,
a relative displacement attenuation mechanism that is fixed to the rising portion and the opposing portion and that attenuates the relative displacement between the rising portion and the opposing portion,
The relative displacement damping mechanism includes:
A vibration damping structure comprising a viscoelastic portion fixed to each of the raised portion and the opposing portion. 2. The vibration damping structure according to claim 1,
The vibration structure includes a shaft protruding from the facing portion toward the rising portion, a facing surface member facing the rising portion with a gap therebetween and to which the viscoelastic portion is fixed, an arm portion extending laterally from the facing surface member, and a rotating portion provided at the tip of the arm portion and supported by the shaft so as to be freely rotatable, forming a rotating body integral therewith;
the support structure has a support portion that stands upright from the horizontal portion and supports the rotating body at a top portion on which the arm portion is placed,
A vibration damping structure, characterized in that the length of the arm portion from the top to the opposing surface material side is longer than the length of the arm portion from the top to the rotating portion side. 3. The vibration damping structure according to claim 2,
The rising portion has a rising surface material that faces the opposing surface material with a gap therebetween,
A vibration damping structure characterized in that the viscoelastic portion is fixed to each of the raised portion surface material and the opposing portion surface material. A vibration damping structure for damping vibration of a vibration structure provided on a support structure,
The support structure includes a horizontal portion provided under the vibration structure;
a rising portion rising from the horizontal portion;
having
the vibration structure has an opposing portion facing the rising portion with a gap therebetween in a horizontal direction,
A vibration isolating part is provided on the horizontal part,
a relative displacement attenuation mechanism that is fixed to the rising portion and the opposing portion and that attenuates the relative displacement between the rising portion and the opposing portion,
A vibration damping structure, characterized in that the vibration structure is a machine foundation on which equipment that generates vibrations during operation is installed.

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