Vibration damping structure

Abstract

To provide a vibration attenuation structure which has higher attenuation performance of vibration in a vibration structure.SOLUTION: A vibration attenuation structure attenuates vibration of a vibration structure 1 provided in a support structure 2. The support structure 2 has a horizontal section 2b provided under the vibration structure 1 and a rise section 2c rising from the horizontal section 2b. The vibration structure 1 has a facing section 1a facing the rising section 2c at an interval in a horizontal direction and is provided on the horizontal section 2b through a vibration control section 3. The vibration attenuation structure includes a relative displacement attenuation mechanism 4 which is fixed to each of the rising section 2c side and the facing section 1a side and attenuates relative displacement between the rising section 2c and the facing section 1a.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vibration damping structure. [Background technology]

[0002] Conventionally, in order to reduce vibrations generated 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 upper 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). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 09-177093 Summary of the Invention [Problem to be solved by the invention]

[0004] However, vibration-isolation structures such as those described 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 they are unable to ensure sufficient damping performance.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to provide a vibration damping structure having higher vibration damping performance in a vibrating structure. [Means for solving the problem]

[0006] 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 fixed to the rising portion and the opposing portion, the relative displacement attenuation mechanism attenuating the relative displacement between the rising portion and the opposing portion; Has The relative displacement damping mechanism includes: The viscoelastic portion is fixed to the side of the rising portion and the side of the facing portion. It is characterized by:

[0007] According to this vibration damping structure, the vibration structure is provided on the horizontal part of the support structure via a vibration damper, 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 the rising part of the support structure with a horizontal gap therebetween, so that the vibration damping 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 to damp vibration. Therefore, it is possible to provide a vibration damping structure with higher vibration damping performance in the vibration structure.

[0009] Also, 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.

[0010] Such a vibration damping structure includes a shaft protruding from the opposing portion toward the raised portion, an opposing surface material facing the raised 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 by the shaft so as to be rotatable about the shaft, forming a rotating body integral with the vibration damping structure; the support structure has a support portion that stands upright from the horizontal portion and supports the rotating body at a 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.

[0011] According to this vibration damping structure, the rotating body is rotatably supported by the opposing portion via an arm extending laterally, and the arm is supported by the top of the support portion erected from the horizontal portion 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 portion. 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 portion. At this time, the rotating body rotates around the axis and the opposing surface material is displaced downward.

[0012] Therefore, when the vibration structure and the support structure are displaced relative to each other in the vertical direction, the vibration is damped by the viscoelastic part interposed between the rising part and the opposing surface material. 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 larger amount than the relative displacement between the vibration structure and the support structure due to the lever action. Therefore, it is possible to increase the damping force by displacing the arm part larger than when the viscoelastic part is directly provided between the rising part and the opposing part.

[0013] Such a vibration damping structure is characterized in that the raised portion has a raised portion surface material that faces the opposing portion surface material with a gap therebetween, and the viscoelastic portion is fixed to each of the raised portion surface material and the opposing portion surface material.

[0014] According to this vibration damping structure, the vibration damping member interposed between the rising surface member and the facing surface member The viscoelastic portion can dampen vibrations. Also, there is a vibration damping structure that damps vibration of a vibrating structure provided on a support structure, the support structure having a horizontal portion provided under 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 isolating portion, and having relative displacement damping mechanisms fixed to the rising portion side and the opposing portion side, respectively, for damping relative displacement between the rising portion and the opposing portion, the vibrating structure being: During operation It is characterized in that it is a machine foundation on which equipment that generates vibration is installed. Effect of the Invention

[0015] According to the present invention, it is possible to provide a vibration damping structure having higher vibration damping performance in the vibration structure. [Brief description of the drawings]

[0016] [Figure 1] 1 is a vertical cross-sectional view showing a vibration damping structure according to an embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view taken along the line AA in FIG. [Diagram 3] 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. [Figure 4] FIG. 4 is an exploded perspective view showing a configuration of a relative displacement damping mechanism. [Diagram 5] FIG. 13 is a diagram showing a state in which the vibration structure is displaced upward. [Figure 6] FIG. 13 is a diagram showing a state in which the vibrating structure is displaced downward. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration damping structure according to an embodiment of the present invention will now be described with reference to the drawings.

[0018] As shown in Figure 1, the vibration damping structure of this embodiment comprises a machine foundation 1 as a vibrating structure on which a device (not shown) that vibrates during operation, such as a rotary press, is installed, a pressure-resistant plate 2 as a support structure having a pit 2a in which the machine foundation 1 is placed, a vibration-proof part 3 interposed between the machine foundation 1 and a horizontal part 2b forming the bottom of the pit 2a, and a relative displacement damping mechanism 4 provided between a side surface of the pit 2a (hereinafter referred to as the pit side surface) 2c and a side surface of the machine foundation 1 (hereinafter referred to as the foundation side surface) 1a.

[0019] The machine foundation 1 is a rectangular parallelepiped foundation having a flat surface on which an apparatus is placed, and the pressure plate 2 is a concrete structure provided on the ground.

[0020] The pit 2a provided in the pressure plate 2 has a rectangular shape in a plan view and is large enough to accommodate the machine foundation 1. The machine foundation 1 is fixed onto a sheet-like vibration isolating part 3, such as a vibration isolating rubber, provided on the horizontal part 2b of the pit 2a.

[0021] The machine foundation 1 is disposed at the center of the pit 2a on a horizontal plane, and when it is disposed on the horizontal part 2b via the vibration isolation part 3, the four foundation side faces 1a of the machine foundation 1 face the four pit side faces 2c of the pit 2a at approximately the same intervals. Here, the pit side faces 2c correspond to the rising parts rising from the horizontal part, and the foundation side faces 1a correspond to the opposing parts facing the rising parts at a horizontal interval.

[0022] In this embodiment, the upper surface of the machine foundation 1 and the upper surface of the pressure plate 2 are installed to form 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, of the horizontal directions, the direction along the long side of the machine foundation 1 in a plan view is referred to as the left-right direction, and the direction along the short side of the machine foundation 1 is referred to as the depth direction.

[0023] 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 portion 7 interposed between the foundation side member 5 and the pit side member 6, and a support pillar 8 as a support portion erected from the horizontal portion 2b of the pit 2a.

[0024] The foundation side member 5 has a foundation base plate 50 fixed facing the foundation side surface 1a, an axis 51 protruding horizontally from the foundation side surface 1a toward the opposing pit side surface 2c and penetrating the foundation base plate 50, and a rotating body 52 supported on the axis 51 so as to be freely rotatable.

[0025] The rotating body 52 is arranged approximately parallel to the foundation side surface 1a and the pit side surface 2c, and has two opposing panel members 53, 54 that face each other, an upper panel member 55 that connects the upper ends of the two opposing panel 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 upper panel member 55, and a rotating portion 57 that is provided at the extended tip of the arm portion 56 and through which the axis 51 passes.

[0026] The rotating body 52 is supported so as to be freely rotatable by having the axis 51 inserted through the rotating portion 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 below the extension portion 55a.

[0027] The pit side member 6 has a pit base plate 60 which is fixed facing the pit side surface 2c, a first facing member 61 which faces the pit base plate 60 with a gap therebetween, a second facing member 62 which faces the first facing member 61 with a gap therebetween, and a bottom member 63 which protrudes from the surface of the pit base plate 60 facing the foundation side surface 1a and connects the lower ends of the first facing member 61 and the second facing member 62.

[0028] In a state in which the foundation side member 5 is provided on the foundation side surface 1a of the machine foundation 1 and the pit side member 6 is fixed to the pit side surface 2c of the pressure plate 2, 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, as shown in Fig. 3. 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 therebetween.

[0029] A viscoelastic portion 7 is interposed between the surface 62a of the second facing material 62 facing the first facing material 61 and the facing surface material 53 on the foundation base board 50 side, and a viscoelastic portion 7 is interposed between each of both surfaces 61a of the first facing material 61 and the two facing surface materials 53, 54.

[0030] As shown in FIG. 2, the support column 8 is erected from the horizontal portion 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 at its upper end with a roller 8a 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 no relative displacement occurs between the machine foundation 1 and the pressure plate 2, the rotating body 52 is supported and installed with the arm 56 horizontal.

[0031] 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 rotatably supported by the shaft 51 becomes higher than the top 8b of the support column 8 on which the arm part 56 is supported, so that the rotating body 52 rotates around the shaft 51 so that the opposing surface members 53, 54 side becomes lower than the top 8b of the support column 8.

[0032] At this time, the amount of vertical displacement on the opposing surface member 53 side, which is farther 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 closer 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 member 61 and the second opposing member 62, is greater than the amount of vertical relative displacement L1 between the machine foundation 1 and the pressure plate 2.

[0033] Furthermore, 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 rotatably supported by the shaft 51 becomes lower than the top 8b of the support column 8 on which the arm part 56 is placed and supported, so that the rotating body 52 rotates about the shaft 51 so that the opposing surface member 53 side becomes higher than the top 8b of the support column 8.

[0034] At this time, the amount of vertical movement on the side of the facing surface member 53 which is farther away from the top 8b of the support column 8 serving as the fulcrum is greater than the amount of vertical displacement on the side of the rotating part 57 which is closer to the top 8b of the support column 8. In other words, the amount of vertical relative displacement L2 at the center of the facing 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 facing surface member 53 and the first facing member 61 and the second facing member 62, is greater than the amount of vertical relative displacement L1 between the machine foundation 1 and the pressure plate 2.

[0035] In this way, the displacement of the opposing surface material 53 and the first opposing material 61 and the second opposing material 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 opposing material 61 and the second opposing material 62 is therefore 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.

[0036] According to the vibration damping structure of this embodiment, an anti-vibration section 3 is provided between the horizontal section 2b of the pressure plate 2 and the machine foundation 1, and a relative displacement damping mechanism 4 is provided between the pit side surface 2c of the pressure plate 2 and the foundation side surface 1a of the machine foundation 1 which faces it with a gap in the depth direction. Therefore, the anti-vibration section 3 shifts the natural frequency of the machine foundation 1 including the equipment 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 vibration.

[0037] More specifically, for example, various vibrations of 2 to 50 Hz are generated from equipment installed on the machine foundation 1, and by fixing the equipment to the machine foundation 1, the natural frequency becomes approximately 30 Hz, and by placing the vibration isolation part 3 below the machine foundation 1, the natural frequency becomes approximately 19 Hz, and 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.

[0038] The facing surface members 53, 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 part 2b of the pressure plate 2. For this reason, 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 about the shaft 51, and the facing surface members 53, 54 are displaced upward.

[0039] Furthermore, 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 about 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 portion 7 interposed between the pit side surface 2c and the foundation side surface 1a.

[0040] At this time, since the length L4 of the arm 56 placed on the support column 8 from the top 8b of the support column 8, where the arm 56 is placed, to the opposing surface members 53, 54 side is longer than the length L5 from the top 8b of the support column 8 to the shaft 51 side, the lever action causes the displacement of the opposing surface members 53, 54 to be greater than the relative displacement between the machine foundation 1 and the pressure plate 2. For this reason, it is 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.

[0041] The above-mentioned embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents thereof.

[0042] In the above embodiment, an example was described in which a relative displacement damping mechanism 4 is provided in which a viscoelastic portion 7 is interposed between a foundation side member 5 that is freely rotatably arranged between the pit side face 2c and the foundation side face 1a, and a pit side member 6 that is fixed to the pit side face 2c. However, the present invention is not limited to this, and 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 face, and a viscoelastic portion is provided between this opposing surface member and the first opposing material and second opposing material of the pit side member, or a viscoelastic portion is provided directly between the foundation side face and the pit side face.

[0043] In the above embodiment, an example has been described in which the relative displacement damping mechanism 4 is provided between the foundation side surface 1a and the pit side surface 2c along the left-right direction of the machine foundation 1, but it may be provided between the foundation side surface 1a and the pit side surface 2c along the depth direction of the machine foundation 1. In addition, it may be provided between the foundation side surface 1a and the pit side surface 2c along the left-right direction of the machine foundation 1, and between the foundation side surface 1a and the pit side surface 2c along the depth direction of the machine foundation 1, respectively.

[0044] 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, the example in which the vibration structure is the machine foundation 1 and the support structure is the pressure plate 2 has been described, but the present invention is not limited to this. [Explanation of symbols]

[0045] 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. Anti-vibration section 4. Relative Displacement Damping Mechanism 5 Foundation side members 6 Pit side parts 7 Viscoelasticity section 7a Upper edge corner 8 Support column (corresponding to the support part) 8a Roller 8b Top 50 Base plate 51 Axis 52 Rotating body 53 Opposing surface material 54 Opposing surface material 55 Top 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 rising surface material) 62a: Surface of the second facing material facing the first facing material 63 Bottom material L1 Relative displacement L2 Relative displacement L3 Displacement L4: The length from the top of the support column to the side of the opposing surface material in the arm section. L5: Length of arm from top of support column to side of pivot;

Claims

1. 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. 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. 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.

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, 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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