Tuned mass damping device
阅读说明:本技术 调谐质量阻尼装置 (Tuned mass damping device ) 是由 岳涛 林胜 袁鹏飞 胡伟辉 苏泽涛 杨超 于 2019-09-20 设计创作,主要内容包括:本发明涉及一种调谐质量阻尼装置,包括:连杆,所述连杆沿着纵向方向延伸;加重组件,所述加重组件连接在所述连杆的下端处;以及顶部连接组件,所述顶部连接组件连接在所述连杆的上端与塔筒的塔架横梁之间,并包括纵向承载机构,所述纵向承载机构包括:固定连接件,所述固定连接件与所述塔架横梁固定连接;活动连接件,所述活动连接件与所述固定连接件间隔开,并与所述连杆固定相连;以及弹性连接关节,所述弹性连接关节连接在所述固定连接件和所述活动连接件之间,并构造为能产生弹性变形以允许所述活动连接件相对于所述固定连接件发生摆动。该装置能够有效削弱风电发动机的塔筒的摆动,并且使用寿命较长。(The invention relates to a tuned mass damping device, comprising: a link extending along a longitudinal direction; a weight assembly connected at a lower end of the connecting rod; and a top connection assembly connected between the upper end of the connecting rod and a tower beam of the tower drum and including a longitudinal bearing mechanism, the longitudinal bearing mechanism including: the fixed connecting piece is fixedly connected with the tower beam; the movable connecting piece is spaced from the fixed connecting piece and is fixedly connected with the connecting rod; and an elastic connection joint connected between the fixed connection member and the movable connection member and configured to be elastically deformed to allow the movable connection member to swing with respect to the fixed connection member. The device can effectively weaken the swing of the tower drum of the wind power engine, and has a long service life.)
1. A tuned mass damping device comprising:
a link extending along a longitudinal direction;
a weight assembly connected at a lower end of the connecting rod; and
a top coupling assembling, the top coupling assembling is connected between the upper end of connecting rod and the tower crossbeam of a tower section of thick bamboo to including vertical load bearing mechanism, vertical load bearing mechanism includes:
the fixed connecting piece is fixedly connected with the tower beam;
the movable connecting piece is spaced from the fixed connecting piece and is fixedly connected with the connecting rod; and
an elastic connection joint connected between the fixed connection member and the movable connection member and configured to be elastically deformed to allow the movable connection member to swing with respect to the fixed connection member.
2. The tuned mass damping device according to claim 1, wherein a receiving hole is formed in the fixed connector through the fixed connector in a first lateral direction,
the movable connecting piece comprises a movable connecting part fixedly connected with the connecting rod and a pair of movable extending parts extending upwards from the movable connecting part, the pair of movable extending parts are spaced from each other in a first transverse direction, the accommodating hole of the fixed connecting piece is positioned between the pair of movable extending parts, the movable connecting piece further comprises a movable connecting rod extending in the first transverse direction and connected between the pair of movable extending parts, the movable connecting rod penetrates through the accommodating hole and is spaced from the wall of the accommodating hole,
the elastic connection joint is engaged between a wall of the accommodation hole and the movable link.
3. The tuned mass damping device according to claim 2, wherein the fixed connection comprises an upper connection body connected below the tower beam and a lower connection body connected below the upper connection body, wherein a lower surface of the upper connection body and an upper surface of the lower connection body each form a portion of a wall of the receiving hole.
4. The tuned mass damping device according to claim 2, wherein the fixed connection comprises a fixed connection fixed to the tower beam, and a fixed extension formed by the fixed connection extending downward, the receiving hole being formed in the fixed extension.
5. The tuned mass damping device according to claim 3 or 4, wherein the fixed connection is configured with a ledge extending radially at an end edge of the receiving bore, the ledge having an inner diameter smaller than an outer diameter of the resilient connecting knuckle to define the resilient connecting knuckle within the receiving bore.
6. The tuned mass damping device according to any of claims 2 to 5, wherein the movable linkage comprises a cylindrical rod body, which is fitted with the resilient connecting knuckle, and a flat cut-out portion provided at an end of the rod body, the movable extension portion being configured with a fixing hole, which comprises a linear profile portion, the flat cut-out portion being fitted with the linear profile portion when the end of the rod body is inserted into the fixing hole.
7. The tuned mass damping device according to any of claims 2 to 6, wherein the resilient connecting knuckle comprises:
an outer glenoid sleeve extending in the first lateral direction and engaging a wall of the receiving hole;
the inner-layer joint sleeve extends along the first transverse direction, is sleeved between the outer-layer joint sleeve and the movable connecting rod and is jointed with the movable connecting rod; and
an elastic connecting ring which is jointed between the outer joint sleeve and the inner joint sleeve and can generate elastic deformation.
8. The tuned mass damping device according to claim 7, wherein the inner wall of the outer shell knuckle joint sleeve and/or the outer wall of the outer shell knuckle joint sleeve is configured as an arcuate surface with a middle portion projecting radially outward.
9. The tuned mass damping device according to claim 7 or 8, wherein a plurality of layers of mutually nested elastic connection rings are provided between the outer and inner joint sleeves, the plurality of layers of mutually nested elastic connection rings being spaced apart from each other by a metal layer.
10. The tuned mass damping device according to any of claims 2 to 9, wherein the top connection assembly further comprises an anti-rotation mechanism comprising:
the pair of anti-rotation fixing pieces are spaced from each other along a first transverse direction and are fixedly connected with the tower beam, and the pair of movable extending parts are positioned between the pair of anti-rotation fixing pieces;
the pair of connecting shaft levers are respectively connected to two ends of the movable connecting rod, extend out relative to the movable connecting rod along a first transverse direction, penetrate through the mounting holes in the pair of anti-rotation fixing pieces and are spaced from the walls of the mounting holes; and
the pair of connectors are arranged between the pair of connecting shaft rods and the wall of the mounting hole respectively, and each connector comprises an outer sleeve part connected with the wall of the mounting hole, an inner sleeve part sleeved in the outer sleeve part and connected with the connecting shaft rods, and an intermediate elastic layer arranged between the inner sleeve part and the outer sleeve part.
11. The tuned mass damping device according to any of claims 2 to 9, wherein the top connection assembly further comprises an anti-rotation mechanism comprising:
a pair of connecting shafts extending longitudinally upward from the movable connector to be inserted into the mounting holes of the fixed connector, the pair of connecting shafts being spaced apart from each other; and
the pair of connectors are arranged between the pair of connecting shaft rods and the wall of the mounting hole respectively, and each connector comprises an outer sleeve part connected with the wall of the mounting hole, an inner sleeve part sleeved in the outer sleeve part and connected with the connecting shaft rods, and an intermediate elastic layer arranged between the inner sleeve part and the outer sleeve part.
12. The tuned mass damping device according to claim 10 or 11, wherein the inner lateral surface of the outer sleeve and/or the outer lateral surface of the inner sleeve is configured as an arcuate surface, the middle portion of which protrudes radially outwards.
13. The tuned mass damping device according to any of claims 10 to 12, wherein first recessed portions are configured at the upper and lower edges of the intermediate resilient layer.
14. The tuned mass damping device according to any one of claims 10 to 13, wherein the anti-rotation mechanism further comprises an outer mounting sleeve, the connecting head being mounted in the mounting hole by the outer mounting sleeve, the outer mounting sleeve being configured to be pre-extruded over the outer sleeve member so as to pre-compress the intermediate elastic layer of the connecting head.
15. The tuned mass damping device according to any one of claims 10 to 14, wherein the anti-spinning mechanism further comprises an inner mounting sleeve, the connecting head is connected to the connecting shaft through the inner mounting sleeve, and the inner mounting sleeve is configured to be pre-extruded to fit within the inner sleeve, so that the intermediate elastic layer of the connecting head is pre-compressed.
16. The tuned mass damping device according to any of claims 10 to 15, wherein the connecting shaft is slidable in axial direction relative to the inner sleeve of the connecting head.
17. The tuned mass damping device according to claim 16, wherein a gap is provided between the connecting shaft and the inner sleeve of the connecting head, or a linear bearing or a body of wear-resistant material is provided.
18. The tuned mass damping device according to any one of claims 1 to 17, wherein the weight assembly comprises one weight unit, below which a collision mechanism is arranged, which collision mechanism is configured to correspond to a mating collision member mounted within the tower so as to be able to collide with each other.
19. The tuned mass damping device according to any one of claims 1 to 17, wherein the weight assembly comprises at least two weight units, which are spaced apart from each other in the longitudinal direction, wherein a collision mechanism is provided between two of the at least two weight units, which collision mechanism is configured to correspond to a mating collision member mounted within the tower so as to be able to collide with each other, wherein the at least two weight units are configured to be able to adjust the center of gravity of the tuned mass damping device at the collision mechanism.
20. The tuned mass damping device according to claim 18 or 19, wherein the crash mechanism comprises:
a collision body sleeved in the matching collision piece in an annular structure; and
a buffering elastic member connected between the collision body and a weight unit located above the collision body.
21. The tuned mass damping device according to claim 20, wherein the damping spring is configured as a cylindrical spring extending in a longitudinal direction.
22. The tuned mass damping device according to claim 20 or 21, wherein an elastic pad is arranged between the striker body and the mating striker body, the elastic pad being made of a softer metal or polymer material than the striker body.
23. The tuned mass damping device according to any of claims 18 to 22, wherein the weighting unit comprises a pallet extending in a transverse direction, and a weighting plate superposed on the pallet.
24. The tuned mass damping device according to any one of claims 1 to 23, further comprising a bottom spring assembly disposed below the weight assembly, the bottom spring assembly comprising a bottom spring extending in a longitudinal direction and connected between a bottom wall of the tower and the weight assembly.
25. The tuned mass damping device according to claim 24, wherein said bottom spring assembly further comprises:
a first connecting rod extending downward from the weight assembly in a longitudinal direction; and
the second connecting rod extends along the longitudinal direction, the upper end of the second connecting rod is hinged to the first connecting rod, and the lower end of the second connecting rod is connected with the bottom elastic part.
26. The tuned mass damping device according to claim 24 or 25, wherein the bottom spring assembly further comprises a third connecting rod connected between the bottom spring and the bottom wall of the tower, the third connecting rod being hingedly connected to the bottom wall of the tower.
27. The tuned mass damping device according to claim 26, further comprising a damper connected between the first connecting rod and the side wall of the tower, the damper extending in a transverse direction, the damper being hinged at each end to the first connecting rod and the tower.
28. The tuned mass damping device according to claim 27, wherein the damper is hinged at each end to the first connecting rod and the side wall of the tower.
29. The tuned mass damping device according to claim 27, wherein the damper has an inclination in the longitudinal direction, and both ends of the damper are hinged to the first connecting rod and the bottom wall of the tower, respectively.
30. The tuned mass damping device according to any one of claims 1 to 29, wherein the linkage comprises:
a connecting mandrel connected between the top connection assembly and the weight assembly, the connecting mandrel being configured to be elongated to reduce its weight; and
an outer housing extending in a longitudinal direction to abut between the top connection assembly and the weight assembly, the outer housing surrounding the connection mandrel.
Technical Field
The invention relates to the technical field of vibration reduction of wind driven generators, in particular to a tuned mass damping device.
Background
Wind power generation is a clean energy source and has attracted much attention in recent years. In order to improve the power generation efficiency, high tower fans arranged in the areas with medium and low wind speeds and offshore wind farms gradually become an important direction for competition of various fan host plants. The increase in height of a tower section of thick bamboo can effectively improve the generating efficiency, but can lead to a tower section of thick bamboo to produce vibration, even great swing simultaneously. Such vibrations and oscillations have an adverse effect on the structural stability of the generator itself. In addition, the rotational speed of the unit may span the tower first order frequency. When this rotational speed crosses the tower frequency, resonance occurs, thereby posing a very serious safety hazard.
In the prior art, the transverse swing of the tower is reduced by hanging sandbags in the tower of the tower through chains with iron hooks. This approach is very low cost and easy to implement. However, this structure is very worn in actual use, requires frequent maintenance, and is not suitable for long-term use.
Therefore, a device for weakening the swing of the tower of the wind power engine with long service life is needed.
Disclosure of Invention
Aiming at the problems, the invention provides a tuned mass damping device which can effectively weaken the swing of a tower drum of a wind power engine and has a long service life.
According to the invention, a tuned mass damping device is proposed, comprising: a link extending along a longitudinal direction; a weight assembly connected at a lower end of the connecting rod; and a top connection assembly connected between the upper end of the connecting rod and a tower beam of the tower drum and including a longitudinal bearing mechanism, the longitudinal bearing mechanism including: the fixed connecting piece is fixedly connected with the tower beam; the movable connecting piece is spaced from the fixed connecting piece and is fixedly connected with the connecting rod; and an elastic connection joint connected between the fixed connection member and the movable connection member and configured to be elastically deformed to allow the movable connection member to swing with respect to the fixed connection member.
The elastic connection joint can generate elastic deformation so that the movable connecting piece can swing relative to the fixed connecting piece, and therefore the problems of abrasion and the like of a joint can be effectively avoided. This is very advantageous for extending the lifetime of the device. The device can realize that the weighting component swings opposite to the tower drum, thereby effectively weakening the swing of the tower drum.
In one embodiment, a receiving hole is formed in the fixed link to penetrate the fixed link in a first transverse direction, the movable link includes a movable connecting portion fixedly connected to the link, and a pair of movable extending portions extending upward from the movable connecting portion, the pair of movable extending portions are spaced apart from each other in the first transverse direction, the receiving hole of the fixed link is between the pair of movable extending portions, the movable link further includes a movable link extending in the first transverse direction and connected between the pair of movable extending portions, the movable link passes through the receiving hole and is spaced apart from a wall of the receiving hole, and the elastic connection joint is engaged between a wall of the receiving hole and the movable link.
In one embodiment, the fixed connection includes an upper connection body connected below the tower beam and a lower connection body connected below the upper connection body, and a lower surface of the upper connection body and an upper surface of the lower connection body respectively form a part of a wall of the accommodation hole.
In one embodiment, the fixed connection member includes a fixed connection portion fixed to the tower beam, and a fixed extension portion formed by extending the fixed connection portion downward, and the receiving hole is formed in the fixed extension portion.
In one embodiment, the fixed connection is configured with a ledge extending radially at an end edge of the receiving hole, the ledge having an inner diameter smaller than an outer diameter of the resilient connecting knuckle to define the resilient connecting knuckle within the receiving hole.
In one embodiment, the movable connecting rod includes a cylindrical rod body, and a flat cut portion provided at an end of the rod body, the rod body being engaged with the elastic connection joint, a fixing hole being configured on the movable extension portion, the fixing hole including a linear contour portion, the flat cut portion being engaged with the linear contour portion when the end of the rod body is inserted into the fixing hole.
In one embodiment, the elastic connection joint comprises: an outer glenoid sleeve extending in the first lateral direction and engaging a wall of the receiving hole; the inner-layer joint sleeve extends along the first transverse direction, is sleeved between the outer-layer joint sleeve and the movable connecting rod and is jointed with the movable connecting rod; and the elastic connecting ring is jointed between the outer joint sleeve and the inner joint sleeve and can generate elastic deformation.
In one embodiment, the inner wall of the outer shell joint sleeve and/or the outer wall of the outer shell joint sleeve are configured as arcuate surfaces with a central portion projecting radially outward.
In one embodiment, the joint sleeve is characterized in that a plurality of layers of elastic connecting rings sleeved with each other are arranged between the outer joint sleeve and the inner joint sleeve, and the plurality of layers of elastic connecting rings sleeved with each other are spaced from each other through the metal layers.
In one embodiment, the top coupling assembly further comprises an anti-rotation mechanism, the anti-rotation mechanism comprising: the pair of anti-rotation fixing pieces are spaced from each other along a first transverse direction and are fixedly connected with the tower beam, and the pair of movable extending parts are positioned between the pair of anti-rotation fixing pieces; the pair of connecting shaft levers are respectively connected to two ends of the movable connecting rod, extend out relative to the movable connecting rod along a first transverse direction, penetrate through the mounting holes in the pair of anti-rotation fixing pieces and are spaced from the walls of the mounting holes; and the pair of connectors are respectively arranged between the pair of connecting shaft levers and the walls of the mounting holes, and each connector comprises an outer sleeve part connected with the walls of the mounting holes, an inner sleeve part sleeved in the outer sleeve part and connected with the connecting shaft levers, and an intermediate elastic layer arranged between the inner sleeve part and the outer sleeve part.
In one embodiment, the top coupling assembly further comprises an anti-rotation mechanism, the anti-rotation mechanism comprising: a pair of connecting shafts extending longitudinally upward from the movable connector to be inserted into the mounting holes of the fixed connector, the pair of connecting shafts being spaced apart from each other; and the pair of connectors are respectively arranged between the pair of connecting shaft levers and the walls of the mounting holes, and each connector comprises an outer sleeve part connected with the walls of the mounting holes, an inner sleeve part sleeved in the outer sleeve part and connected with the connecting shaft levers, and an intermediate elastic layer arranged between the inner sleeve part and the outer sleeve part.
In one embodiment, the inner lateral surface of the outer sleeve and/or the outer lateral surface of the inner sleeve are configured as arcuate surfaces, the middle portion of which protrudes radially outwards.
In one embodiment, first recessed portions are configured at the upper and lower edges of the middle elastic layer.
In one embodiment, the rotation preventing mechanism further comprises an outer mounting sleeve, the connector is mounted in the mounting hole through the outer mounting sleeve, and the outer mounting sleeve is configured to be sleeved outside the outer sleeve in a pre-extrusion manner, so that the middle elastic layer of the connector is pre-compressed.
In one embodiment, the outer mounting sleeve is provided with a mounting slot for matching with the inner sleeve and a thread for matching with the wall of the mounting hole.
In one embodiment, the anti-rotation mechanism further comprises an inner mounting sleeve, the connector is connected with the connecting shaft rod through the inner mounting sleeve, and the inner mounting sleeve is configured to be sleeved in the inner sleeve in a pre-extrusion mode, so that the middle elastic layer of the connector is pre-compressed.
In one embodiment, the inner mounting sleeve is fixedly connected with the connecting shaft rod into a whole.
In one embodiment, the connecting shaft is slidable in axial direction relative to the inner sleeve of the connecting head.
In one embodiment, a gap is provided between the connecting shaft and the inner sleeve of the connecting head, or a linear bearing or a wear-resistant material body is provided.
In one embodiment, the weight assembly includes one weight unit, and a collision mechanism is disposed under the one weight unit, the collision mechanism being configured to correspond to a mating collision member installed in the tower so as to be capable of colliding with each other.
In one embodiment, the weight assembly comprises at least two weight units spaced apart from each other in the longitudinal direction, a collision mechanism being provided between two of the at least two weight units, the collision mechanism being configured to correspond to a mating collision member mounted within the tower so as to be able to collide with each other, the at least two weight units being configured to be able to adjust the center of gravity of the tuned mass damping device to the collision mechanism.
In one embodiment, the impact mechanism comprises: a collision body sleeved in the matching collision piece in an annular structure; and a buffering elastic member connected between the collision body and a weight unit located above the collision body.
In one embodiment, the cushion spring is configured as a cylindrical spring extending in the longitudinal direction.
In one embodiment, an elastic pad is disposed between the striker body and the mating striker, the elastic pad being made of a metal or polymer material softer than the striker body.
In one embodiment, the weight unit includes a pallet extending in a lateral direction, and a weight plate stacked on the pallet.
In one embodiment, the tuned mass damping device further comprises a bottom spring assembly disposed below the weight assembly, the bottom spring assembly comprising a bottom resilient member extending in a longitudinal direction and connected between the bottom wall of the tower and the weight assembly.
In one embodiment, the bottom spring assembly further comprises: a first connecting rod extending downward from the weight assembly in a longitudinal direction; and the second connecting rod extends along the longitudinal direction, the upper end of the second connecting rod is hinged with the first connecting rod, and the lower end of the second connecting rod is connected with the bottom elastic part.
In one embodiment, the bottom spring assembly further comprises a third connecting rod connected between the bottom elastic member and the bottom wall of the tower, and the third connecting rod is hinged with the bottom wall of the tower.
In one embodiment, the tuned mass damping device further comprises a damper connected between the first connecting rod and the side wall of the tower, the damper extends in the transverse direction, and two ends of the damper are hinged to the first connecting rod and the tower respectively.
In one embodiment, two ends of the damper are respectively hinged with the first connecting rod and the side wall of the tower.
In one embodiment, two of said dampers are spaced from each other in the transverse direction by an angle of 90 °.
In one embodiment, the damper has an inclination in the longitudinal direction, and both ends of the damper are hinged to the first connecting rod and the bottom wall of the tower, respectively.
In one embodiment, the link comprises: a connecting mandrel connected between the top connection assembly and the weight assembly, the connecting mandrel being configured to be elongated to reduce its weight; and an outer housing extending in a longitudinal direction to abut between the top connection assembly and the weight assembly, the outer housing surrounding the connection mandrel.
Compared with the prior art, the invention has the advantages that: the device has a long service life. Meanwhile, the weighting assembly can freely swing in all directions, so that the swing of the tower can be effectively weakened.
Drawings
The invention is described in more detail below with reference to the accompanying drawings. Wherein:
FIG. 1 illustrates an exemplary embodiment of a tuned mass damping device of the present invention;
FIG. 2 shows an enlarged partial view of the top connection assembly of the device of FIG. 1;
FIG. 3 shows a cross-sectional view of the resilient connection joint in the top connection assembly of FIG. 2;
FIG. 4 shows a perspective view of the lower connector in the top connector assembly of FIG. 2;
FIG. 5 shows an exploded view of a portion of the top connection assembly;
FIG. 6 shows a perspective view of the connector in the top connection assembly of FIG. 2;
FIG. 7 shows one embodiment of the connector of FIG. 6;
fig. 8 to 10 show further embodiments of the connection head of fig. 6;
FIGS. 11 and 12 show another embodiment of a top connection assembly;
FIGS. 13 and 14 show schematic block diagrams of an embodiment of a linkage of a tuned mass damping device;
figures 15 and 16 show one embodiment of a weighted component of a tuned mass damping device;
FIGS. 17 and 18 illustrate one embodiment of a crash mechanism for a tuned mass damper;
FIG. 19 illustrates one embodiment of a bottom spring assembly in a tuned mass damping device;
FIG. 20 shows another embodiment of a bottom spring assembly in a tuned mass damping device;
FIGS. 21 and 22 show another embodiment of a crash mechanism;
fig. 23 shows yet another embodiment of a crash mechanism.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
Figure 1 shows one embodiment of a tuned mass damping device (hereinafter referred to simply as the "device") 100 of the present invention. The
The detailed structure of the
Fig. 2 shows an embodiment of the
The longitudinal load bearing mechanism also includes a
Fig. 3 shows one embodiment of the elastic joint 82 described above. The elastic connection joint 82 includes a cylindrical outer
Preferably, as shown in fig. 3, the
It should be understood that multiple layers of elastomeric attachment rings may be nested within one another. Which may be spaced apart from each other by a metal layer therebetween. The rigidity and load-bearing capacity of the elastic joint 82 can be enhanced by this structure.
FIG. 4 shows a preferred configuration of the
In addition, as shown in fig. 5, the
In the embodiment shown in fig. 2, the
An exemplary configuration of the connector 842' is shown in more detail in fig. 7. The connector 842' includes a substantially cylindrical
Preferably, the intermediate
In one embodiment, as shown in fig. 8, the connector 842' may be directly mounted in a stepped bore in the
In another embodiment, as shown in fig. 9, the connector 842' is connected to the
In the embodiment shown in fig. 10, the connector 842' is connected to the
The wear-
Preferably, as shown in fig. 7, the
In addition, it is also preferable that, as shown in fig. 7, the middle
As shown in fig. 2, the
The distance between the two connectors 842' can be adjusted as desired. The larger the distance is, the more easily the above-mentioned rotation is prevented.
Fig. 11 to 12 show another embodiment of a
As shown in fig. 11, the
Fig. 12 shows another angled view of the
The embodiment of fig. 3 facilitates easy removal of parts, particularly the
Fig. 13 and 14 show the structure of the connecting
Fig. 15 and 16 show the structure of the
The
Preferably, a corresponding groove may be provided at a lower surface of the
Similarly, the
It should be understood that only one weight unit, or three, four or more weight units may be provided as necessary. In addition, the weighted plate may be configured as a rectangle, a circle, a triangle, or any other suitable shape, as desired. In the case where one weight unit is provided, the collision mechanism 4 is disposed below the one weight unit. In the case where three or more weight units are provided, the collision mechanism 4 may be provided between two of the weight units.
As shown in fig. 15, a collision mechanism 4 may also be provided between the two
As shown in fig. 17, the collision mechanism 4 includes a cushion
In correspondence with the
As shown in fig. 18, the
Preferably, as shown in fig. 18, an
In a preferred embodiment, the center of gravity of the
In the embodiment shown in fig. 17, a plurality of columnar cushion
Fig. 21 and 22 show a buffering elastic member 44' as another embodiment. The damping spring is configured as an integral ring. A plurality of studs 49 are provided along the annularly extending path of the cushion spring 44'. These studs 49 may be used to fixedly connect the mounting
Fig. 23 shows a cushion
Fig. 19 shows a specific structure of the
Fig. 20 shows another embodiment of the
Further, a first mounting
In addition, a
In addition, in the embodiment shown in fig. 19, the
Preferably, a plurality of
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
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