JP2005326030A - Damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy-to-assemble damping device utilizing the resistance and heating of viscous fluid. <P>SOLUTION: The damping device has a conversion part 10 and a damping part 30 separately assembled and detachably connected together via a joint part 50. The conversion part 10 has a first casing 11 storing a nut 13 of a ball screw mechanism 12 rotatably via a pair of bearings 17. The damping part 30 has a second casing 31 storing a rotor 32 rotatably via a pair of bearings 35 and viscous fluid 33 between the rotor 32 and itself. The joint part 50 connects the nut 13 to the rotor 32 via inside connection cylinders 51, 52 in a rotation transmissive manner and connects the casings 11, 31 to each other via an outside connection cylinder 53. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for finally converting and attenuating energy generated with relative displacement between two target parts of a building structure in the event of an earthquake or the like by converting it into thermal energy of a viscous fluid.

An apparatus for attenuating energy at the time of an earthquake is known as disclosed in, for example, Japanese Patent Application Laid-Open No. 10-184757.
The damping device shown in FIG. 1 of the publication includes a cylindrical casing, a ball screw mechanism and a rotating body accommodated in the casing, and a viscous fluid accommodated between the casing and the rotating body. . This ball screw mechanism has a nut and a screw rod screwed into the nut. The nut and the rotating body are fixed to each other. One end of the screw rod protrudes from one end of the casing and is connected to one target part of the building structure, and the other end of the casing is connected to the other target part of the building structure.

When relative displacement occurs between the target parts of the building structure as in an earthquake, the screw rod is displaced in the axial direction with respect to the casing. Then, the rotational action of the rotating body is converted by the screwing action between the screw rod and the nut, and the viscous fluid in contact with the rotating body generates heat due to frictional resistance or the like. As a result, the energy accompanying the displacement is converted into thermal energy of the viscous fluid and attenuated.
In the above damping device, the ball screw mechanism and a part of the casing corresponding thereto constitute a conversion part for converting the relative displacement between the target parts into a rotational motion, and other than the rotating body, the viscous fluid, and the corresponding casing. This part constitutes an attenuation part for converting rotational kinetic energy into thermal energy and attenuating it.

  The damping device of FIG. 1 of the above publication is assembled as follows. First, the ball screw mechanism and the rotating body are integrated by fixing the rotating body to the nut of the ball screw mechanism. Next, the nut and the rotating body are inserted together in the casing, and are rotatably supported by a pair of bearings separated in the axial direction. That is, one bearing is mounted between one end of the casing and the nut, and the other bearing is mounted between the other end of the casing and the rotating body. Next, the viscous fluid is filled between the casing and the rotating body through the injection hole of the casing.

The above assembly method is particularly unsuitable for a device installed in a large building structure to attenuate a large earthquake energy, for example, a large device having a total weight exceeding 1 ton. This is because a heavy and long monolithic structure consisting of a ball screw mechanism and a rotating body is inserted into a heavy and long casing, and at that time, it is necessary to mount a pair of bearings between them with high precision, which is very difficult to work. This is because it becomes difficult. In addition, when the integrated object is inserted into the casing, an assembly work space larger than the sum of the lengths of both of them is required, resulting in an increase in work space. This is also true when disassembling for maintenance or the like.
Moreover, in the said attenuation device, when one specification of the conversion part and the attenuation part was changed, it was necessary to change the other specification, and the cost accompanying a specification change was high.

The present invention has been made in order to solve the above-described problem, and is an attenuation device disposed between two target parts of a structure, which converts a relative displacement between the target parts into a rotational motion. And a damping part for attenuating the energy of the rotational movement, wherein the conversion part has a first casing and a ball screw mechanism, and the ball screw mechanism is rotatably accommodated in the first casing. And a screw rod that is screwed into the nut and protrudes from the first casing and is connected to one target part of the structure, and the damping part is connected to the other target part of the structure. In a damping device having a casing, a rotating body rotatably accommodated in the second casing, and a viscous fluid accommodated between the second casing and the rotating body,
The nut of the conversion part is rotatably supported on the first casing by a plurality of bearings separated in the axial direction, and the rotating body of the damping part is rotatable on the second casing by a plurality of bearings separated in the axial direction. In a state where the conversion unit and the attenuation unit are coaxially supported, the nut of the conversion unit and the rotating body of the attenuation unit are coupled so as to be able to transmit rotation, and the first and second casings are coupled, The nut and the rotating body have a connecting portion, a convex portion is formed at one end of the connecting portion, a concave portion is formed at the end of the other connecting portion, and the nut and the concave portion are engaged with each other to form the nut. And the rotating body are detachably connected to each other so as to be able to transmit the rotation.
Preferably, the nut and the rotating body are coupled by engaging the convex portion and the concave portion with the axial movement.
Preferably, each of the nut and the rotating body has a connecting cylinder as the connecting portion, and among these connecting cylinders, a convex portion is formed at one end of the connecting cylinder, and a concave portion is formed at the end of the other connecting cylinder. It is formed.

Moreover, this invention is an attenuation device arrange | positioned between two object parts of a structure, Comprising: The conversion part which converts the relative displacement between the said object parts into rotational motion, and the attenuation part which attenuates the energy of this rotational motion And the conversion portion has a first casing and a ball screw mechanism, and the ball screw mechanism is screwed into the nut and is rotatably engaged with the nut. The second casing connected to the other target portion of the structure, and the second casing is rotatably accommodated in the second casing. And a damping device having a viscous fluid housed between the second casing and the rotating body,
The nut of the conversion part is rotatably supported on the first casing by a plurality of bearings separated in the axial direction, and the rotating body of the damping part is rotatable on the second casing by a plurality of bearings separated in the axial direction. In a state where the conversion unit and the attenuation unit are coaxially supported, the nut of the conversion unit and the rotating body of the attenuation unit are coupled so as to be able to transmit rotation, and the first and second casings are coupled, The nut is supported by the bearings disposed at both ends of the first casing, and the rotating body is supported by the bearings disposed at both ends of the second casing.
Preferably, the first and second casings are detachably connected.
Preferably, opposite end portions of the first and second casings are detachably connected via a connecting cylinder.

According to the present invention, the conversion part and the damping part casing are separated from each other, and the nut of the ball screw mechanism is rotatably supported by the first casing by the plurality of bearings in the conversion part. Since the structure is rotatably supported by the second casing, the conversion part and the attenuation part can be connected after being assembled separately, and the assembly work can be made small and the assembly work can be easily performed. can do. Moreover, since the structure which assembles a conversion part and an attenuation | damping part separately can be employ | adopted, even if there is a change of one specification, it becomes possible to avoid the change of the other specification.
Moreover, if the conversion part and the attenuation part are connected close to each other on the same axis, the nut and the rotating body can be easily connected.
Further, if the first and second casings are detachable, the conversion part and the attenuation part can be divided by releasing the connection between the nut and the rotating body and the connection between the first and second casings. Furthermore, if the connecting cylinder is used, it becomes easy to change the specifications of the conversion unit and the attenuation unit separately.

  Hereinafter, an attenuation device according to a first embodiment of the present invention will be described with reference to FIGS. The attenuation device is provided between, for example, two target portions in a building structure. The damping device of the present embodiment extends linearly as shown in FIG. 1 and has two assemblies 10 and 30 that can be divided in the longitudinal direction and a joint portion 50 that couples both as a basic configuration. ing. One assembly 10 serves as a conversion unit that converts relative displacement between objects of the building structure into rotational motion, and the other assembly 30 serves as an attenuation unit that converts rotational motion energy into thermal energy. Yes.

  The conversion unit 10 includes a cylindrical casing 11 (first casing) and a ball screw mechanism 12. The ball screw mechanism 12 includes a nut 13 rotatably accommodated in a casing 11 and a screw rod 15 screwed to the nut 13 via a ball 14 (shown in FIGS. 2 and 3). ing. The threaded rod 15 is accommodated in the casing 11 coaxially with the casing 11, and one end thereof protrudes from the casing 11. A disk-shaped mounting portion 16 is provided at the protruding end of the screw rod 15.

  Next, means for rotatably supporting the nut 13 will be described. The rotation support means includes a pair (a plurality) of bearings 17 disposed at both ends of the casing 11 apart in the axial direction, and a pair of support cylinders 18 fixed to both ends of the nut 13. A pair of bearings 17 are interposed between the support cylinder 18 and the casing 11, so that the nut 13 is supported so as to be rotatable at high speed. The bearing in this embodiment uses a thrust bearing or a cross roller bearing.

  Each bearing 17 has balls arranged in two rows in an annular shape and three races that receive the balls. Annular holding members 19a and 19b for holding the intermediate ring of the bearing 17 are fixed to the outer ends of the pair of support cylinders 18, and an annular type for holding the outer ring of the bearing 17 is fixed to both ends of the casing 11. The holding members 20a and 20b are fixed.

Next, the attenuation unit 30 will be described. The attenuating portion 30 includes a cylindrical casing 31 (second casing), a cylindrical rotating body 32 that is coaxial with the casing 31 and accommodated so as to be rotatable at a high speed, and a viscous fluid accommodated in a gap therebetween. 33 (shown in FIGS. 2 to 4). The viscous fluid 33 is also referred to as a viscous body, and includes one having elasticity (viscoelastic body) and one having no elasticity. Examples of viscous fluid include polyisobutylene.
A disc-shaped attachment portion 34 is provided at the end of the casing 31 opposite to the joint portion 50.

A pair (a plurality) of radial bearings 35 are provided between both ends of the casing 31 and the rotating body 32, and the viscous fluid 33 is sealed in the vicinity of the bearings 35 in the axial direction of the bearing 35. A sealing structure 40 is provided.
The bearing 35 located on the joint part 50 side of the casing 31 is pressed by a connecting cylinder 52 (pressing member) of the joint part 50 described later. Further, the bearing 35 located on the opposite side of the joint portion 50 is pressed by an annular pressing member 39.

The seal structure 40 will be described in detail with reference to FIG. The seal structure 40 includes seal members 41 and 42 and two support rings 43 and 44 that support the seal members 41 and 42.
The support ring 43 has a short cylindrical shape, has a flange 43a projecting radially and outwardly at one end, and a flange 43b projecting radially and inwardly at the other end, and an end face of the flange 43b The sealing member 42 made of an O-ring is fitted in the annular groove 43c formed in the above. The support ring 44 has a rectangular cross section and abuts against the flange 43b of the support ring 43. The seal member 41 has a substantially F-shaped cross section, and has a pair of seal pieces 41a and 41b facing each other and a flange 41c projecting radially and outwardly.

  The flange 41 c of the seal member 41 is sandwiched between the support rings 43 and 44. The outer seal piece 41 a of the seal member 41 is in contact with the inner peripheral surface of the flange 43 b of the support ring 43, and the inner seal piece 41 b is in contact with the outer peripheral surface of the end of the rotating body 32 whose diameter is reduced. In the natural state, these seal pieces 41a and 41b are spread away from each other toward the tip. Therefore, the seal pieces 41a and 41b are elastically in contact with the inner peripheral surface of the support ring 43 and the outer peripheral surface of the rotating body 32, respectively. The seal function can be demonstrated.

  The support rings 43 and 44 are inserted between the end portions of the casing 31 and the rotator 32 with the seal members 41 and 42 mounted in advance as shown in the figure. At this time, the outer seal piece 41a of the seal member 41 is in contact with the support ring 43 in a state of being elastically deformed in advance, and the inner seal piece 41b is formed on the tapered surface 32a formed on the rotating body 32 when inserted. Since they are guided, the seal pieces 41a and 41b are not damaged.

  The seal member 41 seals between the support ring 43 and the rotating body 32, and the seal member 42 seals between the support ring 43 and the casing 31. Thereby, leakage of the viscous fluid 33 accommodated between the casing 31 and the rotating body 32 can be prevented. The viscous fluid 33 is filled from an injection hole 31 a formed in the casing 31.

The joint portion 50 includes a pair of inner connecting cylinders 51 and 52 and an outer connecting cylinder 53.
One inner connecting cylinder 51 has a flange 51 a, and this flange 51 a is fixed to the pressing member 19 b of the conversion unit 10 by a bolt 54. Therefore, the connecting cylinder 51 is fixed to the nut 13 via the pressing member 19 b and the support cylinder 18. The connecting cylinder 51 is provided as a meshing part (connecting part) of the nut 13.
The other inner connecting cylinder 52 has a flange 52 a, and this flange 52 a is fixed to the end face of the rotating body 32 by a bolt 55. The connecting cylinder 52 also serves as a pressing member for the bearing 35. The connecting cylinder 52 is provided as a meshing part (connecting part) of the rotating body 32.

Convex portions 51 b are formed at two positions separated in the circumferential direction at the end of the connecting cylinder 51, and a concave portion 52 b is formed at the end of the connecting cylinder 52. The nut 13 and the rotating body 32 are connected to each other so as to be able to transmit the rotation and to be detachable by the engagement of the convex portion 51b and the concave portion 52b.
The outer connecting cylinder 53 has flanges 53a projecting radially and outwardly at both ends. The flange 53 a is connected to the end faces of the casings 11 and 31 that face each other by bolts 56. Thus, the casings 11 and 31 are detachably connected via the connecting cylinder 53.

In the attenuation device having the above-described configuration, the attachment portion 16 of the screw rod 15 in the conversion portion 10 and the attachment portion 34 of the casing 31 in the attenuation portion 30 are coupled to two target portions of the building structure, respectively.
As the building structure is distorted during an earthquake or the like, the two target portions are relatively displaced so as to approach or move away from each other. At this time, the screw rod 15 is displaced in the axial direction with respect to the casing 11. The axial displacement (linear motion) of the screw rod 15 is converted into the rotational motion of the nut 13 screwed onto the screw rod 15, and the rotation of the rotating body 32 connected to the nut 13 via the connecting cylinders 51 and 52. Bring exercise. The speed of the outer peripheral surface of the rotating body 32 increases dramatically compared to the relative displacement speed of the screw rod 15 with respect to the casing 11.

When the rotating body 32 rotates, it receives the frictional resistance of the viscous fluid 33 accommodated between the rotating body 32 and the casing 31. As a result, the kinetic energy associated with the rotation of the rotating body 32 is converted to the thermal energy of the viscous fluid 33 and attenuated, thereby protecting the building structure from the earthquake.
The casing 11 of the conversion unit 10 is connected to the casing 31 of the attenuation unit 30 via a connecting cylinder 53, and supports the nut 13 via a pair of bearings 17. As a result, even if a bending load or the like from the screw rod 15 is applied to the nut 13, the load on the nut 13 can be reduced, and the function of converting to the rotational motion can be ensured.

  Next, the assembly of the attenuation device will be described in detail. The conversion unit 10 and the attenuation unit 30 are assembled separately, and the conversion unit 10 and the attenuation unit 30 are connected via the joint unit 50 in the final process.

  The assembly of the conversion unit 10 is as follows. The ball screw mechanism 12 is suspended vertically with the casing 11 standing vertically and inserted into the casing 11. A pair of support cylinders 18 is fixed to the nut 13 of the ball screw mechanism 12 in advance. In this inserted state, a pair of bearings 17 are mounted, and holding members 19a, 19b, 20a, and 20b for holding the bearings 17 are attached.

Since the casing 11 and the ball screw mechanism 12 are shorter than the total length of the damping device when the conversion unit 10 is assembled, the ball screw mechanism 12 can be easily inserted into the casing 11 without requiring a large assembly space. The bearing 17 can be easily mounted with high accuracy. In the assembly of the conversion unit 10, the nut 13 is stably supported by the pair of bearings 17.
The connecting cylinder 51 is fixed to the pressing member 19b at the end of the assembly process of the conversion unit 10.

  The assembling of the attenuation part 30 is as follows. With the casing 31 standing vertically, the rotating body 32 is suspended and inserted into the casing 31. In this inserted state, as described above, the pair of seal structures 40 are mounted from both ends of the casing 31, and then the pair of bearings 35 are mounted, and the connecting cylinder 52 and the pressing member 39 for pressing these are mounted.

  When the damping part 30 is assembled, the casing 31 and the rotating body 32 are shorter than the entire length of the damping device. Can be easily mounted with high accuracy. In the assembly of the damping part 30, the rotating body 32 is in a stable support state by a pair of bearings 35.

  The conversion unit 10 and the attenuation unit 30 assembled separately as described above are connected in the final process as shown in FIG. That is, with the attenuation unit 30 standing vertically, the conversion unit 10 is suspended and positioned directly above the attenuation unit 30 so as to be coaxial with the attenuation unit 30.

  Next, the conversion unit 10 is lowered (moved in the axial direction) with the connecting cylinder 53 interposed between the attenuation unit 30 and the conversion unit 10. Then, the convex part 51b of the connection cylinder 51 of the attenuation | damping part 30 fits in the recessed part 52b of the connection cylinder 52 of the conversion part 10. FIG. As a result, the connecting cylinders 51 and 52 are coaxially connected so as to be able to transmit rotation, and as a result, the nut 13 and the rotating body 32 are coaxially connected so as to be able to transmit rotation.

When the connection of the connecting cylinders 51 and 52 is completed, one flange 53a of the outer connecting cylinder 53 hits the end surface of the casing 11 via the pressing member 20b, and the other flange 53a passes through the support ring 43 to the casing 31. In this state, the pair of flanges 53a are connected to the casings 11 and 31 by the bolts 56.
Since there is no insertion relationship between the conversion part 10 and the attenuation part 30, a large assembly space is not required and the connecting work is also simple.

  In the first embodiment, the main part, particularly the vicinity of the joint part, can be modified as shown in FIG. More specifically, the attenuation device of this modification includes a conversion unit 10A, an attenuation unit 30A, and a joint unit 50A that connects them. In this modification, the same reference numerals are given to the components corresponding to the first embodiment, and detailed description thereof will be omitted.

  10 A of said conversion parts are the same as that of 1st Embodiment in the point provided with the casing 11, the ball screw mechanism 12, a pair of bearing 17A, and pressing member 20a, 20b which presses the bearing 17A, and the method of an assembly is also the same. is there. The damping part 30A is the same as the first embodiment in that it includes a casing 31A, a rotating body 32A, a viscous fluid 33, a pair of radial bearings 35, and a pair of seal structures 40.

The joint portion 50A is the same as the first embodiment with respect to the outer connecting cylinder 53, but the connecting structure of the nut 13 and the rotating body 32A is slightly different. More specifically, a connecting cylinder 51A (meshing portion, connecting portion) having a convex portion 51b is directly fixed to the nut 13. The end of the rotating body 32A protrudes from the casing 31A, and the protruding end is a connecting cylinder 52A (meshing portion, connecting portion) having a recess 52b.
The point which comprises the joint part 50A by connecting the conversion part 10A and the attenuation | damping part 30A assembled separately is the same as that of 1st Embodiment, and has the same advantage.

  Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the main part structure of FIG. 5 is provided. However, the rotator 32A has a disk part 32x at the intermediate part in the axial direction, and correspondingly, the casing 31x also has a disk part 31x surrounding the disk part 32x. The viscous fluid 33 is also accommodated between the disk portions 31x and 32x. The viscous fluid 33 between the disk portions 31x and 32x exhibits a main damping effect.

  In assembling the damping part 30A, the casing 31A composed of three members is assembled in the process of housing the rotating body 32A in the casing 31A, which is somewhat complicated compared to the first embodiment. This is the same as in the first embodiment in that the assembly space can be reduced and the bearing 35 can be easily mounted with high accuracy.

The present invention is not limited to the above embodiment, and various forms can be adopted. For example, in the first and second embodiments, the connecting cylinder 53 may be connected to one of the casings in advance. In this case, the connecting cylinder 53 is finally connected to the other casing.
Further, the connecting cylinders 51 and 52 (51A and 52A) may be attached to the conversion unit and the attenuation unit when the conversion unit 10 (10A) and the attenuation unit 30 (30A) are connected.
The filling operation of the viscous fluid 33 and the mounting operation of the mounting portions 16 and 34 may be performed either before or after the connection of the conversion unit 10 (10A) and the attenuation unit 30 (30A).
A concave portion may be formed in the connecting cylinder 51 (51A), and a convex portion may be formed in the connecting cylinder 52 (52A).
The connecting cylinder 53 may be omitted. In this case, the opposite ends of the casings 11 and 31 (31A) are extended, and the flanges of the extended ends are connected by bolts or the like.

In the first and second embodiments, the screw rod 15 may have a length that penetrates the rotating bodies 32 and 32A and protrudes from the casing 31A as necessary. Even in such a case, the advantage of the present invention can be obtained as compared with the conventional assembly method in which the ball screw mechanism and the rotating body are integrated into the casing in a state of being integrated.
In the first and second embodiments, a so-called Oldham shaft joint is adopted as the structure of the connecting portion between the nut and the rotating body. However, a ball spline connection may be used, and the nut and the rotation may be rotated when connecting the first and second casings. You may connect so that rotation transmission is possible by pressing the connection part of a body.
In the second embodiment, the main part structure of FIG. 2 may be adopted.

It is a perspective view which cuts and shows the attenuation apparatus concerning 1st Embodiment of this invention partially. It is an expanded longitudinal cross-sectional view of the principal part of the same attenuation device. It is a principal part expanded longitudinal sectional view which shows the final assembly process of the same attenuation device. FIG. 3 is an enlarged longitudinal sectional view showing a main part of a structure for sealing viscous fluid in the damping device. It is an enlarged longitudinal cross-sectional view which shows the modification of the principal part of the attenuation device. It is a longitudinal cross-sectional view which shows the damping device concerning 2nd Embodiment of this invention.

Explanation of symbols

10, 10A Conversion unit 11 First casing 12 Ball screw mechanism 13 Nut 14 Ball 15 Screw rod 17, 17A Bearing 30, 30A Damping unit 31, 31A Second casing 32, 32A Rotating body 33 Viscous fluid 35 Bearing 50, 50A Joint unit 51, 52, 51A, 52A Connecting cylinder (meshing portion)
53 Connecting cylinder (connecting member)
51b Convex part 52b Concave part

Claims (6)

An attenuation device arranged between two object parts of a structure,
A conversion unit that converts relative displacement between the target units into a rotational motion, and an attenuation unit that attenuates the energy of the rotational motion,
The conversion unit includes a first casing and a ball screw mechanism, and the ball screw mechanism is screwed into the nut and protrudes from the first casing so as to protrude from the first casing. Including a screw rod connected to one target part of the body,
The attenuation part is accommodated between the second casing connected to the other target part of the structure, the rotating body rotatably accommodated in the second casing, and the second casing and the rotating body. A damping device having a viscous fluid
The nut of the conversion part is rotatably supported on the first casing by a plurality of bearings separated in the axial direction, and the rotating body of the damping part is rotatable on the second casing by a plurality of bearings separated in the axial direction. Supported,
In a state where the conversion portion and the attenuation portion are coaxial, the nut of the conversion portion and the rotating body of the attenuation portion are connected so as to be able to transmit rotation, and the first and second casings are connected,
The nut and the rotating body have a connecting portion, a convex portion is formed at the end of one connecting portion, a concave portion is formed at the end of the other connecting portion, and the convex portion and the concave portion are engaged with each other to form the nut. And a rotating body are detachably connected to each other so as to be able to transmit rotation.   The damping device according to claim 1, wherein the nut and the rotating body are connected by meshing a convex portion and a concave portion with axial movement.   Each of the nut and the rotating body has a connecting tube as the connecting portion, and among these connecting tubes, a convex portion is formed at the end of one connecting tube, and a concave portion is formed at the end of the other connecting tube. The attenuation device according to claim 1 or 2, characterized in that An attenuation device arranged between two object parts of a structure,
A conversion unit that converts relative displacement between the target units into a rotational motion, and an attenuation unit that attenuates the energy of the rotational motion,
The conversion unit includes a first casing and a ball screw mechanism, and the ball screw mechanism is screwed into the nut and protrudes from the first casing so as to protrude from the first casing. Including a screw rod connected to one target part of the body,
The attenuation part is accommodated between the second casing connected to the other target part of the structure, the rotating body rotatably accommodated in the second casing, and the second casing and the rotating body. A damping device having a viscous fluid
The nut of the conversion part is rotatably supported on the first casing by a plurality of bearings separated in the axial direction, and the rotating body of the damping part is rotatable on the second casing by a plurality of bearings separated in the axial direction. Supported,
In a state where the conversion portion and the attenuation portion are coaxial, the nut of the conversion portion and the rotating body of the attenuation portion are connected so as to be able to transmit rotation, and the first and second casings are connected,
The damping according to claim 1, wherein the nut is supported by the bearings disposed at both ends of the first casing, and the rotating body is supported by the bearings disposed at both ends of the second casing. apparatus.   The damping device according to claim 1, wherein the first and second casings are detachably connected.   6. The damping device according to claim 5, wherein ends of the first and second casings facing each other are detachably connected via a connecting cylinder.

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