JP-2026074506-A - Vibration damping device

Abstract

[Problem] To achieve good vibration damping performance regardless of the mass of the load placed on top. [Solution] The vibration damping device 10 is attached to a rack 1 on which luggage can be stored, and comprises a base member 11 attached to a support member 6 of the rack 1 that extends in a first horizontal direction DH1 and supports the luggage from below, a loading platform member 12 provided above the base member 11 on which luggage is placed, and a rail 13 fixed to the base member 11 and provided to extend in the first horizontal direction DH1, with a rail surface formed such that the upper surface 13c is recessed downward in an arc shape when viewed from a second horizontal direction DH2 perpendicular to the first horizontal direction DH1, the loading platform member 12 is provided with a contact portion 14 that contacts the rail surface from above, and the loading platform member 12 is provided so as to be movable relative to the base member 11 in the first horizontal direction DH1 while maintaining the state in which the contact portion 14 contacts the rail surface. [Selection Diagram] Figure 8

Inventors

• 柳坂 祥希
• 谷 翼
• ▲塚▼田 乙

Assignees

• 大成建設株式会社

Dates

Publication Date

20260507

Application Date

20241021

Claims (3)

1. A vibration damping device that can be attached to a rack capable of storing luggage, A base member attached to a support member of the rack that extends in a first horizontal direction and supports the load from below, A loading platform member is provided above the base member on which the cargo is placed, A rail is fixed to the base member and is provided so as to extend in the first horizontal direction, and when viewed from a second horizontal direction perpendicular to the first horizontal direction, the rail surface is formed such that the upper surface is recessed downward in an arc shape, Equipped with, The aforementioned cargo bed member is provided with a contact portion that contacts the rail surface from above, The vibration damping device is characterized in that the cargo bed member is provided so as to be movable relative to the base member in the first horizontal direction while maintaining a state in which the contact portion is in contact with the rail surface.
2. A vibration damping device that can be attached to a rack capable of storing luggage, A base member attached to a support member of the rack that extends in a first horizontal direction and supports the load from below, A loading platform member is provided above the base member on which the cargo is placed, A rail is fixed to the cargo bed member and is provided so as to extend in the first horizontal direction, and when viewed from a second horizontal direction perpendicular to the first horizontal direction, the rail surface is formed such that the lower surface is recessed upward in an arc shape, Equipped with, The base member is provided with a contact portion that contacts the rail surface from below, The vibration damping device is characterized in that the cargo bed member is provided so as to be movable relative to the base member in a first horizontal direction while maintaining a state in which the rail surface is in contact with the contact portion of the base member.
3. (Corresponding to draft claim 2) The first horizontal direction is the depth direction of the rack, When the rack vibrates in the first horizontal direction, the loading platform member moves relative to the base member so as to reciprocate in the first horizontal direction. The vibration damping device according to claim 1 or 2, characterized in that the radius of curvature of the rail surface is set such that the reciprocating period is approximately equal to the natural period of the rack in the first horizontal direction.

Description

This invention relates to a vibration damping device specifically designed for racks, which are mounted on racks capable of storing cargo. High-rise buildings and other structures are sometimes equipped with vibration damping devices called TMDs (Tuned Mass Dampers). A TMD consists of a mass tuned to a specific frequency (resonant frequency) and a spring or damper that supports it. This device is effective in suppressing vibrations of structures in response to dynamic external forces such as earthquakes and wind. For example, Patent Document 1 discloses a vibration damping device in which the upper end of a suspension member is attached to a support frame and the lower end of the suspension member is attached to a mass body. Incidentally, in automated warehouses, for example, goods are stored in racks. In particular, when goods are stored in racks using a stacker crane, the racks are configured such that the storage spaces are arranged in multiple tiers vertically and multiple rows horizontally. The racks have an opening on one side in the depth direction, allowing goods to be loaded and unloaded from one side in the depth direction by the stacker crane. Therefore, the racks have a short length in the depth direction, equivalent to the length of one storage space. For this reason, vibration damping devices such as the TMD mentioned above are sometimes installed to suppress vibrations in the depth direction of the racks during earthquakes or other events. In racks like the one described above, support members are often provided in each storage space, supported by the rack's columns and extending in the depth direction. In each storage space, the goods are placed on and supported by these support members, thereby storing the goods in the rack. Patent Document 2 discloses a vibration damping device configured to be installed on such support members. More specifically, the vibration damping device of Patent Document 2 includes a base member that extends horizontally on the rack and supports the load from below onto the support member, extends parallel to the support member and is fixed to the support member, a slide member that is positioned on the base member and can support the load on its upper surface, and is slidable relative to the base member in a direction parallel to the base member, a damper device that extends in a direction parallel to the support member so as to be expandable and contractible, and a spring member that extends in a direction parallel to the support member so as to be expandable and contractible. The damper device has one end connected to the base member and the other end connected to the slide member, and the spring member has one end fixed to the base member and the other end connected to the slide member. In the vibration damping device described in Patent Document 2, the load also serves as the mass, allowing the vibration damping device to have a compact configuration. In realizing a vibration damping device as described in Patent Document 2, it is desirable to synchronize the vibration period of the vibration damping device with the natural period in the depth direction of the rack in order to efficiently achieve vibration damping performance. However, since various types of cargo can be stored in each storage space of the rack, the mass of the cargo as a mass body can vary. As a result, the vibration period of the vibration system, which is composed of springs, damping, and mass, changes according to the value of the mass, making it difficult to set the period of the vibration damping device to a constant value. Consequently, it may not be possible to sufficiently synchronize the period of the vibration damping device with the natural period of the rack, and as a result, the vibration damping performance may not be efficiently achieved. In this regard, for example, Patent Document 3 discloses a vibration damping device provided on a rack for supporting pallets. This vibration damping device comprises a slidably supported additional mass, a damper that generates a damping force in the sliding direction of the additional mass, and a fixing jig that fixes the additional mass and the damper to the rack. The fixing jig is fixed to the pallet support portion of the rack, slidably supports the additional mass, and transmits the damping force of the damper to the rack. In the rack vibration damping device described in Patent Document 3, an additional mass is provided, and the mass of this additional mass is made large to support the rack in a state that is not in tune with the rack's natural frequency, and a damper is used to provide a large damping performance, thereby eliminating the need for frequency tuning. However, in such a configuration, the vibration damping performance may not be as efficient as when the vibration damping device is configured to synchronize its period with the rack's natural period. A vibration damping device that can be mounted on a rack and exhibit good vi