JP2014202234A - Attenuation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attenuation device which can effectively suppress vibrations of various kinds of appliances, pipelines and the like without enlarging size of the device, is compact and has large attenuation force.SOLUTION: An attenuation device includes: a first fixation part 1a having a first attachment part 2a fixed to a vibration control object; a second fixation part 2a having a second attachment part 2b fixed to a structural body; a fixed cylinder part 3 which is fixed to the second fixed part 2b and is straight-linearly movably arranged in the first fixed part 2a; a ball screw shaft 8 which is fixed to one end of the first fixation part 1a and is extended into the second fixation part 1b; a first ball nut 10a; a first rotation cylinder part 6a; a second ball nut 10b; and a second rotation cylinder part 6b. Therein, the first screw part 8a and the second screw part 8b are threaded reversely to each other and an attenuating element is arranged between the first rotation cylinder part 6a and a second rotation cylinder part 6b which relatively rotate and/or between second rotation cylinder part 6b and fixed cylinder part 3 which relatively rotate.

Description

  The present invention relates to an attenuation device for various devices and piping.

  In general, mechanical snubbers and damping devices that have a mechanism that converts linear motion into rotational motion are used as devices that suppress vibrations during normal operation of equipment and piping used in various plants and large vibrations during earthquakes. . The mechanical snubber converts a linear motion caused by vibration into a rotational motion of a flywheel and suppresses the vibration by its inertial force. Moreover, a damping device converts a linear motion into the rotational motion of a conductor plate, makes it move relatively with the magnet installed in the fixing | fixed part, and obtains a magnetic damping force by the electromagnetic action (patent document 1).

Japanese Patent No. 29986414

When the above-described conventional mechanical snubber and damping device are applied to large equipment, the size of the damping device is increased by increasing the size of the flywheel to increase the damping force or enlarging the operating range of the conductor plate and the magnet. It was necessary to increase the capacity. For this reason, there existed a subject that the whole apparatus became large sized and weight and cost also increased.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a compact damping device having a large damping force.

  In order to solve the above-described problem, the damping device according to the present embodiment includes a first fixing portion having a first mounting portion that is fixed to the object to be controlled, and a second mounting portion that is fixed to the structure. A second fixed portion having a fixed cylindrical portion that is fixed to the second fixed portion and arranged to be linearly movable in the first fixed portion, and is fixed to the first fixed portion and the second fixed portion. A ball screw shaft extending into the fixed portion, a first ball nut rotatably attached to the first screw portion of the ball screw shaft, and a first rotating cylinder fixed to the first ball nut A second ball nut rotatably attached to the second screw portion of the ball screw shaft, and a surface that is fixed to the second ball nut and faces the first rotating cylinder portion A damping device having a second rotating cylinder portion, wherein the first screw portion The second threaded portion is threaded in opposite directions, and between the first rotating tube portion and the second rotating tube portion and / or between the second rotating tube portion and the fixed tube portion. It is characterized by disposing an attenuation element between them.

  Moreover, the damping device according to the present embodiment has a first fixing portion having a first mounting portion fixed to the object to be controlled and a second fixing having a second mounting portion fixed to the structure. A fixed cylindrical portion fixed to the second fixed portion, a ball nut fixed portion fixed to the fixed cylindrical portion and arranged to be linearly movable in the first fixed portion, and in the ball nut fixed portion A first ball nut fixed to the ball screw shaft, a ball screw shaft rotatably supported at one end of the first fixed portion and extending into the ball nut fixed portion, and a first screw portion of the ball screw shaft. The first ball nut to be screwed, the second ball nut rotatably attached to the second screw portion of the ball screw shaft, and fixed to the second ball nut and inside the fixed cylinder portion A rotating column portion arranged in a damping device having The first screw portion and the second screw portion are threaded in directions opposite to each other, and a damping element is disposed between the rotating column portion and the fixed cylinder portion that rotate relative to each other. To do.

  Moreover, the damping device according to the present embodiment has a first fixing portion having a first mounting portion fixed to the object to be controlled and a second fixing having a second mounting portion fixed to the structure. A fixed cylindrical portion fixed to the second fixed portion, a ball nut fixed portion fixed to the fixed cylindrical portion and arranged to be linearly movable in the first fixed portion, and in the ball nut fixed portion A first ball nut fixed to the ball screw shaft, a ball screw shaft rotatably supported at one end of the first fixed portion and extending into the ball nut fixed portion, and a first screw portion of the ball screw shaft. The first ball nut to be screwed, the second ball nut rotatably attached to the second screw portion of the ball screw shaft, and fixed to the second ball nut and inside the fixed cylinder portion The rotating cylinder portion disposed on the first fixing portion And a fixed column portion disposed inside the rotating cylinder portion, wherein the first screw portion and the second screw portion are threaded in opposite directions and are relatively Attenuating elements are arranged between the rotating cylinder part rotating and the fixed cylinder part and / or between the fixed column part rotating relatively and the rotating cylinder part.

  According to the embodiment of the present invention, it is possible to provide a damping device that is compact and has a large damping force.

Sectional drawing of the damping device which concerns on 1st Embodiment. AA arrow sectional drawing of FIG. Sectional drawing of the attenuation device which concerns on 2nd Embodiment. BB arrow sectional drawing of FIG. Sectional drawing of the attenuation device which concerns on 3rd Embodiment. Sectional drawing of the attenuation device which concerns on 4th Embodiment.

Hereinafter, embodiments of an attenuation device according to the present invention will be described with reference to the drawings.
[First Embodiment]
(Constitution)
The attenuation device according to the first embodiment will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the damping device according to the present embodiment includes a first fixing portion 1a provided with a first attachment portion 2a and a second fixing portion 1b provided with a second attachment portion 2b. The first mounting portion 2a is fixed to a vibration damping object (not shown) such as a pipe, a valve, or a pump, and the second mounting portion 2b is a structure (not shown) such as a wall or a column. Z).

The fixed cylinder part 3 is fixed to the second fixed part 1b, and a slide rail 4 is attached to the side surface of the fixed cylinder part 3. A slider 5 that engages with the slide rail 4 and moves linearly on the slide rail 4 is attached to the inner surface of the first fixed portion 1a.
Inside the fixed cylinder part 3, a second rotary cylinder part 6 b and a first rotary cylinder part 6 a are arranged toward the center, and both are attached to each other via a bearing part 7 so as to be rotatable. .

  A ball screw shaft 8 is fixed to one end of the fixed portion 1a so as to penetrate the inside of the first rotating cylinder portion 6a and extend into the second fixed portion 1b. Threaded in opposite directions with respect to the center. For example, one of the ball screw shafts 8 is composed of a right thread portion (first thread portion) 8a and the other is a left thread portion (second thread portion) 8b.

  A right ball nut (first ball nut) 10a that is rotated by a linear motion of the right screw portion 8a is attached to the right screw portion 8a. The right ball nut 10a is a first rotating cylinder portion 6a. And both are configured to rotate together. Further, a left ball nut 10b (second ball nut) that is rotated by a linear motion of the left screw portion is attached to the left screw portion 8b, and the left ball nut 10b is attached to the second rotating cylinder portion 6b. It is fixed and both are configured to rotate together.

  Further, a plurality of magnets 11 are arranged between the first rotating cylinder part 6a and the second rotating cylinder part 6b and between the second rotating cylinder part 6b and the fixed cylinder part 3 in a circumferential shape. . In the present embodiment, the plurality of magnets 11 are attached to the outer peripheral surface of the first rotating cylinder portion 6 a and the inner peripheral surface of the fixed cylinder portion 3, respectively. Further, as shown in FIG. 2, the outer and inner magnets 11 and the second rotating cylinder portion 6b are arranged in a non-contact manner with a predetermined gap therebetween. The magnets 11 are magnetized so that their surfaces are S-poles or N-poles, and adjacent magnets 11 are arranged so as to have different magnetic poles.

  Here, the fixed cylinder part 3 and the first rotating cylinder part 6a are made of a ferromagnetic material. Further, the second rotating cylinder portion 6b is formed of an electric conductor member, or a conductor member having a predetermined thickness is mechanically or metallic on the inner and outer peripheral surfaces of the second rotating cylinder portion 6b facing the magnet 11. It is attached by means of mechanical joining. The conductor member functions as a damping element together with the magnet.

In contrast to this, a plurality of magnets 11 may be provided on the inner and outer peripheral surfaces of the second rotating cylinder portion 6b, and the outer peripheral surface of the first rotating cylinder portion 6a and the fixed cylinder portion 3 may be formed of a conductor member. Good.
Further, if the necessary magnetic damping force is obtained, the magnet is placed between the first rotating cylinder part 6a and the second rotating cylinder part 6b or between the second rotating cylinder part 6b and the fixed cylinder part 3. It may be arranged on one side.

(Function)
In the damping device of the first embodiment configured as described above, for example, when the object to be controlled vibrates due to an earthquake, and the interval between the first mounting portion 2a and the second mounting portion 2b is to be reduced. The ball screw shaft 8 fixed to the first fixing portion 1a together with the first mounting portion 2a fixed to the vibration object is simultaneously pushed into the right ball nut 10a and the left ball nut 10b.

  At that time, since the right ball nut 10a and the left ball nut 10b are attached to the second fixed portion 1b via the bearing portion 7 and the fixed cylinder portion 3, they rotate according to the amount of being pushed. At this time, since the right ball nut 10a and the left ball nut 10b are respectively attached to the right screw portion 8a and the left screw portion 8b of the ball screw shaft 8, they rotate in directions opposite to each other.

  Accordingly, the first rotating cylinder portion 6a and the second rotating cylinder portion 6b fixed to the right ball nut 10a and the left ball nut 10b, respectively, also rotate relative to each other in the opposite directions, and the relative rotational speed is This is twice the number of rotations by one ball screw and nut.

  Thereby, a large magnetic damping force is obtained by relative movement between the magnet 11 attached to the outer peripheral surface of the first rotating cylinder portion 6a and the inner surface of the second rotating cylinder portion 6b which is a conductor material. In addition, since magnetic attenuation is also obtained by relative movement between the magnet 11 attached to the inner surface of the fixed cylindrical portion 3 and the outer peripheral surface of the second rotating cylindrical portion 6b, a large attenuation capacity can be obtained as a whole device. .

(effect)
As described above, according to the first embodiment, a compact damping device having a large damping force that can effectively suppress vibrations of various devices, piping, structures, etc. without increasing the size of the device. Can be provided. Furthermore, since no hydraulic oil or the like is used, it can be used for a long time and stably even in a radiation environment.

[Second Embodiment]
A damping device according to the second embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

(Constitution)
As shown in FIGS. 3 and 4, the damping device according to the second embodiment is coaxial with the first rotating cylinder portion 6 a between the fixed cylinder portion 3 and the first rotating cylinder portion 6 b of the attenuation device. A third rotating cylinder portion 6c that rotates in a straight line is arranged via a bearing portion 7.

A plurality of magnets 11 are attached to the outer peripheral surface of the first rotating cylinder portion 6a and the inner and outer peripheral surfaces of the third rotating cylinder portion 6c, respectively. In the present embodiment, as shown in FIGS. 3 and 4, the fixed cylinder portion 3 has the conductor member 12 attached to the inner peripheral surface thereof. However, the fixed cylinder portion 3 may be formed of a conductor member. Moreover, in this embodiment, although the 2nd rotation cylinder part 6b is comprised from a conductor member, you may attach a conductor member to the inner peripheral surface.
As in the first embodiment, the conductor member and the magnet may be attached to opposite members.

(Function)
When the object to be controlled is vibrated by an earthquake and the ball screw shaft 8 is simultaneously pushed into the right ball nut 10a and the left ball nut 10b, the right ball nut 10a and the left ball nut 10b are in accordance with the pushed amount. Rotate. At this time, the second rotating cylinder 6b rotates with the rotation of the left ball nut 10b, and the third rotating cylinder 6c in the reverse direction in addition to the first rotating cylinder 6a with the rotation of the right ball nut 10a. Rotate to. The relative rotational speed is twice the rotational speed of one ball screw and nut.

  At that time, the relative movement between the plurality of magnets 11 attached to the outer peripheral surface of the first rotary cylinder portion 6a and the inner peripheral surface of the second rotary cylinder portion 6b, which is a conductor member, and the third rotary cylinder portion 6c. A large magnetic attenuation can be obtained by the relative movement of the magnet attached to the inner and outer peripheral surfaces of the first and second inner surfaces and the conductor member 12 of the second rotating cylinder portion 6b. This makes it possible to obtain a large attenuation capacity as the entire device.

(effect)
According to the second embodiment, it is possible to provide an attenuation device having a larger attenuation capacity by providing the third rotating cylinder portion 6c. Further, the distance between the magnet 11 on the outer peripheral surface of the first rotating cylinder portion 6a and the magnet 11 on the inner peripheral surface of the third rotating cylinder portion 6c, the shape and number of each magnet 11, and the second member which is a conductor member. By designing the thickness of the rotating cylinder portion 6b so as to obtain the optimum magnetic attenuation, a compact attenuation device with high attenuation efficiency can be obtained.

  In the present embodiment, an example in which one third rotating cylinder portion is arranged has been described. However, the present invention is not limited to this, and a plurality of rotating cylinder portions may be provided, thereby increasing the capacity of the attenuation function. be able to.

[Third Embodiment]
An attenuation device according to a third embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as said embodiment, and the overlapping description is abbreviate | omitted.

(Constitution)
In the present embodiment, a large-capacity rotating column portion 14 is used instead of the first rotating cylinder portion 6a of the first embodiment.

  In the damping device according to the third embodiment, as shown in FIG. 5, the fixed cylinder portion 3 is fixed to the second fixing portion 1 b, and the ball nut fixing portion 13 is fixed to the fixed cylinder portion 3. . The right ball nut 10a (first ball nut) is fixed inside the ball nut fixing portion 13, and the first fixing portion 1a is formed by the outer surface of the ball nut fixing portion 13 as in the first and second embodiments. It is guided so as to be relatively linearly movable. A rotating column portion 14 is rotatably attached to the inner side of the fixed cylinder portion 3 via a bearing portion 7.

  A ball screw shaft 8 is rotatably attached to one end of the fixed portion 1a by a bearing portion 15, and the ball screw shaft 8 is threaded in directions opposite to each other almost at the center. For example, one of the ball screw shafts 8 includes a right thread portion (first thread portion) 8a and the other includes a left thread portion (second thread portion) 8b.

  A right ball nut 10a is rotatably engaged with the right screw portion 8a, and the ball screw shaft 8 is rotated by a linear motion of the right ball nut 10a. Further, the left ball nut 10b (second ball nut) is fixed to the rotating column portion 14, and is rotatably attached to the left screw portion 8b. As a result, the left ball nut 10b rotates together with the rotating column portion 14 as shown by the shaded portion in FIG.

  A magnet 11 constituting an attenuation element is attached to the inner peripheral surface of the fixed cylinder portion 3. The fixed cylinder portion 3 is made of a ferromagnetic material, and the rotating column portion 14 is made of an electrical conductor member, or a conductor member having a predetermined thickness is attached to the outer peripheral surface thereof by mechanical or metal bonding. The conductor member functions as a damping element together with the magnet.

  Moreover, the magnet 11 and the rotating column part 14 are arrange | positioned through the predetermined gap | interval, the magnet 11 is magnetized so that the surface may become a south pole or a north pole, and the adjacent magnet 11 becomes a mutually different magnetic pole. Are arranged as follows.

(Function)
In the damping device of the fourth embodiment configured as described above, for example, when the object to be controlled vibrates due to an earthquake, and the interval between the first mounting portion 2a and the second mounting portion 2b is to be reduced, The ball screw shaft 8 rotatably attached to the first fixing portion 1a together with the first attachment portion 2a is simultaneously pushed into the right ball nut 10a and the left ball nut 10b.

  At this time, since the right ball nut 10a is fixed to the ball nut fixing portion 13, the ball screw shaft 8 rotates. Moreover, since the left ball nut 10b is attached to the 2nd fixing | fixed part 1b via the bearing part 7 and the fixed cylinder part 3, it rotates according to the amount pressed.

  At that time, the right ball nut 10a and the left ball nut 10b are respectively attached to the right screw portion 9a and the left screw portion 9b of the ball screw shaft 8, and the right ball nut 10a is fixed. 10b is rotated by a linear motion accompanying the rotation of the ball screw shaft 8, and the number of rotations at that time is twice the number of rotations by one ball screw and a nut.

  Thereby, a large inertial force is obtained by the rotating column portion 14 fixed to the left ball nut 10b. In addition, since a large magnetic damping force is obtained by relative movement between the rotating column portion 14 that is a conductive material and the magnet 11 attached to the inner surface of the fixed cylinder portion 3, a large damping capacity can be obtained as a whole device.

(effect)
According to the third embodiment, it is possible to obtain a compact attenuation device having a larger attenuation capacity by using the rotating column portion.

[Fourth Embodiment]
An attenuation device according to a fourth embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as said embodiment, and the overlapping description is abbreviate | omitted.
In this embodiment, it is set as the structure which uses a fixed column part and a rotation cylinder part instead of the rotation column part of 3rd Embodiment.

  As shown in FIG. 6, in the damping device according to the fourth embodiment, the rotating cylinder portion 16 is fixed to the left ball nut 10 b, and the fixed column portion 17 is fixed to one fixed portion 1 a. The fixed column part 17 is located inside the rotary cylinder part 16 and supports the rotary cylinder part 16 via the bearing part 7 so as to be rotatable.

Magnets 11 are attached to the outer peripheral surface of the fixed column portion 17 and the inner peripheral surface of the fixed cylinder portion 3. The fixed column part 17 and the fixed cylinder part 3 are both made of a ferromagnetic material, and the rotary cylinder part 16 is made of an electrically conductive material, or a conductor member having a predetermined thickness is attached to the outer peripheral surface thereof. The conductor member functions as a damping element together with the magnet.
Thereby, since the magnetic attenuation by the electromagnetic action of the magnet 11 attached to the outer side of the fixed column part 17 and the inner surface of the rotary cylinder part 16 is also obtained, a larger attenuation capacity can be obtained.

  According to the fourth embodiment, in addition to the effects of the third embodiment, the distance between the magnet 11 on the outer surface of the fixed column portion 17 and the magnet 11 on the inner surface of the fixed cylinder portion 3 and the shape and number of each magnet 11. By designing the thickness of the rotating cylinder portion 16 that is a conductor member as appropriate so that magnetic attenuation can be obtained efficiently, a small attenuation device having a large attenuation capacity can be obtained.

  In addition, although the example which has arrange | positioned one rotating cylinder part was demonstrated in this embodiment, it is not limited to this, You may install a some rotating cylinder part coaxially, and aim at the capacity increase of a damping function by this. be able to.

  Further, in the first to fourth embodiments, the example in which the magnet and the conductor member are used as the damping element has been described. However, the present invention is not limited thereto, and the viscous material, the viscoelastic material, the elastic-plastic material, the friction material, or the spring, Alternatively, combinations thereof can be used. Moreover, these attenuation elements can also be used together with the attenuation element which consists of the magnet which concerns on the said embodiment, and a conductor member. In that case, a larger attenuation capacity can be obtained.

  As mentioned above, although the example of embodiment of this invention was demonstrated, it only showed the specific example and does not specifically limit this invention, It can change suitably. Further, the actions and effects described in the embodiments and the modifications thereof are only the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to the ones.

DESCRIPTION OF SYMBOLS 1a ... 1st fixing | fixed part, 1b ... 2nd fixing | fixed part, 2a ... 1st attaching part, 2b ... 2nd attaching part, 3 ... Fixed cylinder part, 4 ... Slide rail, 5 ... Slider, 6a ... 1st 1 rotation cylinder part, 6b ... 2nd rotation cylinder part, 6c ... 3rd rotation cylinder part, 7 ... bearing part, 8 ... ball screw shaft, 8a ... 1st screw part (right screw part), 8b ... Second screw part (left screw part), 10a ... first ball nut (right ball nut), 10b ... second ball nut (left ball nut), 11 ... magnet, 12 ... conductor member, 13 ... ball nut Fixed part, 14 ... rotating column part, 15 ... bearing part, 16 ... rotating cylinder part, 17 ... fixed column part.

Claims (8)

A first fixing portion having a first mounting portion fixed to the object to be controlled, a second fixing portion having a second mounting portion fixed to the structure, and fixed to the second fixing portion A fixed cylinder portion arranged in a linearly movable manner in the first fixed portion, a ball screw shaft fixed to the first fixed portion and extending into the second fixed portion, and a first of the ball screw shafts A first ball nut rotatably attached to one screw portion; a first rotating cylinder portion fixed to the first ball nut; and a second screw portion of the ball screw shaft that is rotatable. A damping device comprising: a second ball nut attached; and a second rotating cylinder portion fixed to the second ball nut and having a surface facing the first rotating cylinder portion,
The first screw portion and the second screw portion are threaded in directions opposite to each other, and between the first rotary cylinder portion and the second rotary cylinder portion and / or the second rotary cylinder. An attenuation device, wherein an attenuation element is arranged between a fixed portion and a fixed cylinder portion.   The damping device according to claim 1, wherein a plurality of rotating cylindrical portions are coaxially fixed to the first ball nut. A first fixing portion having a first mounting portion fixed to the object to be controlled, a second fixing portion having a second mounting portion fixed to the structure, and fixed to the second fixing portion A fixed tube portion, a ball nut fixed portion fixed to the fixed tube portion and arranged so as to be linearly movable in the first fixed portion, a first ball nut fixed in the ball nut fixed portion, A ball screw shaft rotatably supported by the first fixing portion and extending into the ball nut fixing portion; the first ball nut screwed into a first screw portion of the ball screw shaft; and the ball A damping device comprising: a second ball nut rotatably attached to a second screw portion of the screw shaft; and a rotating column portion fixed to the second ball nut and disposed in the fixed cylinder portion Because
The first screw portion and the second screw portion are threaded in directions opposite to each other, and an attenuation element is disposed between the rotating column portion and the fixed cylinder portion. A first fixing portion having a first mounting portion fixed to the object to be controlled, a second fixing portion having a second mounting portion fixed to the structure, and fixed to the second fixing portion A fixed tube portion, a ball nut fixed portion fixed to the fixed tube portion and arranged so as to be linearly movable in the first fixed portion, a first ball nut fixed in the ball nut fixed portion, A ball screw shaft rotatably supported by the first fixing portion and extending into the ball nut fixing portion; the first ball nut screwed into a first screw portion of the ball screw shaft; and the ball A second ball nut rotatably attached to a second screw portion of the screw shaft; a rotating cylinder portion fixed to the second ball nut and disposed in the fixed cylinder portion; Fixed to the fixed part and disposed inside the rotating cylinder part A damping device comprising a pillar portion,
The first screw portion and the second screw portion are threaded in directions opposite to each other, and between the rotary cylinder portion and the fixed cylinder portion, and / or between the fixed column portion and the rotary cylinder portion. A dampening device characterized in that a dampening element is arranged on the front.   Between the first rotating cylinder part and the second rotating cylinder part, between the second rotating cylinder part and the fixed cylinder part, between the rotating column part and the fixed cylinder part rotating relative to each other, and the rotation. The damping element arranged between the cylinder part and the fixed cylinder part and between the fixed column part and the rotating cylinder part is composed of a conductor member attached to one side and a magnet attached to the other side. The attenuation device according to any one of claims 1 to 4.   6. The attenuation device according to claim 5, wherein the one is made of a conductor member.   The damping device according to claim 5 or 6, further comprising a viscous material, a viscoelastic material, an elastic-plastic material, a friction material and a spring, or a combination thereof as the damping element.   The damping device according to any one of claims 1 to 4, wherein the damping element is made of a viscous material, a viscoelastic material, an elastic-plastic material, a friction material and a spring, or a combination thereof.

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