JP5881510B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device. In detail, it is related with the seismic isolation apparatus provided with the lock mechanism.

Conventionally, manufacturing apparatuses such as pharmaceuticals and semiconductors and equipment such as server racks may have a seismic isolation structure. Specifically, a seismic isolation device is fixed to the floor, and the device is mounted on the seismic isolation device.
In this seismic isolation structure, when an earthquake occurs, the seismic isolation device is activated to absorb the shaking of the earthquake and reduce the influence of the earthquake motion on the manufacturing device.

However, if the seismic isolation device is operated with a small shake that does not require the seismic isolation device to operate, the production line yield and quality may be affected.
For example, the seismic isolation device may be activated due to a small shake caused by a small earthquake or a person leaning on the manufacturing device. Then, there is a problem that an error occurs in the detailed operation of the manufacturing apparatus, or a position shift occurs in the manufacturing apparatus, resulting in a failure in delivery of the product to the transport apparatus.

In order to solve this problem, a lock mechanism and a trigger mechanism have been proposed (see Patent Documents 1 and 2).
Patent Document 1 discloses a lock mechanism provided around a building having a seismic isolation structure. The lock mechanism is composed of a base member, a movable member, a shaft body, a pendulum member, a mooring member, and the like.
According to this lock mechanism, even if typhoon wind pressure or the like acts on the building, the building is prevented from rolling by restraining the mooring rod fixed to the building with the pendulum member and the mooring member provided on the foundation side. On the other hand, at the time of an earthquake, the pendulum member and the mooring member fall down due to the earthquake and detach from the mooring rod, the building can move freely with respect to the foundation, and the seismic isolation structure absorbs the shaking.

Patent Document 2 discloses a trigger mechanism incorporated in a seismic isolation device. The trigger mechanism includes a case body, a moving pin, a weight, a spring, and the like.
According to this trigger mechanism, in a normal state, the moving pin is pressed downward by the weight, and the lower end of the moving pin is engaged with the base side. On the other hand, during an earthquake, the weight connected to the moving pin rolls due to the shaking caused by the earthquake, the moving pin moves upward, and the engagement between the moving pin and the foundation side is released.

Japanese Patent No. 3749931 JP 2005-113972 A

  However, the above-described lock mechanism and trigger mechanism have a problem that they are composed of many parts, have a complicated structure, and increase costs.

  An object of this invention is to provide the seismic isolation apparatus which can prevent that a seismic isolation mechanism act | operates by a small shake at low cost.

The seismic isolation device according to claim 1 or 2 (for example, a seismic isolation device to be described later) includes a lower part (for example, a lower surface 20 to be described later) fixed to a floor surface (for example, a floor surface to be described later), A seismic isolation device that is provided on the lower portion and supports an apparatus (for example, the manufacturing apparatus 1 described later) from below, and that allows relative movement in the horizontal direction between the upper portion and the lower portion. A mechanism, and a lock pin (for example, a lock pin 40 described later) for locking relative movement between the upper portion and the lower portion, and an upper through hole (for example, described later) penetrating the upper portion up and down in the upper portion. The upper through hole 31) is formed, and a substantially box-shaped storage part (for example, a storage part 21 described later) is formed in the lower part. The lower part vertically penetrates the lower part, and the storage part Lower through-holes (for example, a ceiling surface 21A described later) For example, a lower through hole 22 described later is formed, and the lock pin includes a rod-shaped shaft portion (for example, a shaft portion 41 described later) and a locking portion (for example, a base end side of the shaft portion). A locking portion 42 to be described later, wherein the shaft portion is inserted into the upper through hole and the lower through hole, and the locking portion is locked to an upper end edge of the upper through hole. And

  Here, the structure of the seismic isolation mechanism is not particularly limited, and may be any structure such as laminated rubber or a mechanical mechanism.

According to the present invention, the lock pin is attached by inserting the shaft portion into the upper upper through hole and the lower lower through hole until the lock pin engaging portion engages with the upper end edge of the upper through hole.
Even if a horizontal earthquake with a magnitude less than the predetermined value acts on the seismic isolation device due to the occurrence of a microearthquake or a person leaning on the device, the lock pin functions as a punch, The seismic isolation mechanism does not operate to prevent relative movement of the.

  On the other hand, if a large earthquake occurs to a certain extent and a horizontal force greater than the specified value acts on the seismic isolation device, the shaft portion of the lock pin breaks and breaks, allowing relative movement between the upper part and the lower part. The seismic isolation mechanism is activated. At this time, the portion below the broken portion of the lock pin (that is, the tip end side of the lock pin) falls from the lower through hole and is stored in the storage portion.

Therefore, since the lock pin can be inserted and removed from above, the lock pin can be easily replaced without using a tool.
Further, since the storage portion is located directly below the lower through hole, the broken pieces of the lock pin can be easily recovered.

When the seismic isolation mechanism is activated by an earthquake, the upper part may be slightly displaced from the original position. In this case, if the relative position is adjusted while inserting the lock pin into the upper and lower through holes, Since the lock pin is inserted into the lower through-hole when the through-hole returns to a position coaxial with the lower through-hole, the recovery is facilitated.
However, the present invention is not limited to this, and a high-rigidity correction pin having the same shape as the lock pin is prepared separately. The correction pin is inserted into the upper and lower through-holes to correct misalignment, and then the correction pin is locked to the lock pin. May be replaced.

In the seismic isolation device of the present invention , it is preferable that the shaft portion of the lock pin is formed of resin.

  According to the present invention, since the shaft portion of the lock pin is made of resin, the broken portion of the lock pin becomes a pure shear failure. Therefore, the lock pin is broken horizontally based on the diameter of the shaft portion of the lock pin. Force can be calculated easily. Further, the required diameter of the shaft portion of the lock pin can be easily calculated based on the horizontal force at which the seismic isolation mechanism operates, that is, the horizontal force at which the lock pin breaks.

In the seismic isolation device of the present invention , it is preferable that a mark (for example, a groove 43 described later) is provided at a breakage point of the shaft portion of the lock pin.

  According to the present invention, since a mark such as a groove is provided at the breakage point located between the upper part and the lower part of the shaft part of the lock pin, the damage state can be confirmed by pulling out the lock pin from above and visually checking the mark. Since it can be confirmed, the necessity of replacing the lock pin can be easily examined.

The seismic isolation device according to claims 1 and 3 is characterized in that the storage portion is formed of a transparent material.

  According to the present invention, the storage part is made of acrylic or the like to increase the transparency of the storage part, so that the broken part of the lock pin can be visually confirmed to easily grasp the history of operation and the timing of replacement of the lock pin. it can.

  According to the present invention, since the lock pin can be inserted and removed from above, the lock pin can be easily replaced without using a tool. Further, since the storage portion is located directly below the lower through hole, the broken pieces of the lock pin can be easily recovered. When the seismic isolation mechanism is activated by an earthquake, the upper part may be slightly displaced from the original position. In this case, the lock pin or the lock pin and the high-rigidity correction pin are inserted into the upper and lower through holes. If the relative position is adjusted while being inserted, the lock pin is inserted into the lower through-hole when the upper through-hole returns to a position coaxial with the lower through-hole, so that the recovery is facilitated.

It is sectional drawing of the seismic isolation apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing for demonstrating operation | movement of the seismic isolation apparatus which concerns on the said embodiment. It is sectional drawing for demonstrating the procedure which restores the seismic isolation apparatus which concerns on the said embodiment. It is sectional drawing of the seismic isolation apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing for demonstrating the procedure which attaches a lock pin to the seismic isolation apparatus which concerns on the said embodiment. It is sectional drawing for demonstrating operation | movement of the seismic isolation apparatus which concerns on the said embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
[First Embodiment]
FIG. 1 is a cross-sectional view of a seismic isolation device 10 according to the first embodiment of the present invention.
The seismic isolation device 10 is for isolating the manufacturing apparatus 1 as a device.

  The seismic isolation device 10 includes a lower part 20 fixed to the floor 2, an upper part 30 provided on the lower part 20 to support the manufacturing apparatus 1 from below, and a relative relationship between the lower part 20 and the upper part 30 in the horizontal direction. A seismic isolation mechanism (not shown) that allows movement and a lock pin 40 that locks relative movement between the upper part 30 and the lower part 20 are provided.

An upper through hole 31 is formed in the upper portion 30 so as to penetrate the upper portion 30 vertically.
A substantially box-shaped storage portion 21 is formed in the lower portion 20, and further, a lower through-hole 22 that penetrates the lower portion 20 up and down and reaches the ceiling surface 21 </ b> A of the storage portion 21 is formed.
The storage unit 21 is made of a highly transparent material such as acrylic.

  The lock pin 40 includes a rod-shaped shaft portion 41 and a locking portion 42 provided on the proximal end side of the shaft portion 41.

The locking portion 42 protrudes from the shaft portion 41 in a hook shape in a direction substantially perpendicular to the shaft portion 41.
The distal end side of the shaft portion 41 has a shape that becomes narrower toward the distal end.
In addition, a groove 43 as a mark is attached to a broken portion of the shaft portion 41 located in the gap between the upper portion 30 and the lower portion 20.

  The lock pin 40 is attached by inserting the shaft portion 41 into the upper through hole 31 and the lower through hole 22 from above until the locking portion 42 is locked to the upper end edge of the upper through hole 31. Accordingly, the shaft portion 41 is inserted into the upper through hole 31 and the lower through hole 22, and the locking portion 42 is locked to the upper end edge of the upper through hole 31.

In the seismic isolation device 10 described above, even if a microearthquake occurs or a person leans on the manufacturing apparatus 1, even if a horizontal force having a magnitude less than a predetermined value acts on the seismic isolation device 10, the lock pin 40 The seismic isolation mechanism does not operate because it functions as a gap and prevents relative movement between the upper part 30 and the lower part 20.
On the other hand, if a large earthquake occurs to some extent and a horizontal force of a predetermined value or more acts on the seismic isolation device 10 as shown by the white arrow in FIG. The shaft part 41 is sheared and broken at the breakage point, and the upper part 30 and the lower part 20 can be moved relative to each other, and the seismic isolation mechanism operates. At this time, a portion 41 </ b> A below the broken portion of the shaft portion 41 of the lock pin 40 falls from the lower through-hole 22 and is stored in the storage portion 21.

Hereinafter, the size (diameter) of the shaft portion 41 of each lock pin 40 is obtained.
The lock pin is formed of a resin, here polyoxymethylene (POM).

POM shear strength: 54 N / mm ²
Number of lock pins per seismic isolation device: 4 Mass of manufacturing equipment: 4t
Mass of seismic isolation device: 1t
Yield shear coefficient: 0.05

  The threshold value at which the lock pin breaks and the seismic isolation mechanism operates is expressed by the following equation (1).

  Further, the total cross-sectional area of the lock pin is as shown in Equation (2).

  Therefore, the diameter required for each lock pin is expressed by the following formula (3).

According to this embodiment, there are the following effects.
(1) Since the lock pin 40 can be inserted and removed from above, the lock pin 40 can be easily replaced without using a tool.
Moreover, since the accommodating part 21 is located directly under the lower through-hole 22, the broken pieces of the lock pin 40 can be easily recovered.

  After the seismic isolation mechanism is actuated by the earthquake, the upper part 30 may be slightly shifted from the original position. In this case, as shown in FIG. 3, the lock pin 40 is connected to the upper through hole 31 and the lower through hole. If the relative position is adjusted while being inserted into 22, since the lock pin 40 is inserted into the lower through hole 22 when the upper through hole 31 returns to a position coaxial with the lower through hole 22, recovery is facilitated.

  (2) Since the shaft portion 41 of the lock pin 40 is made of resin, the breakage of the lock pin 40 results in pure shear failure. Therefore, the lock pin 40 breaks based on the diameter of the shaft portion 41 of the lock pin 40. The horizontal force to be calculated can be easily calculated. Further, the diameter required for the shaft portion 41 of the lock pin 40 can be easily calculated based on the horizontal force at which the seismic isolation mechanism operates, that is, the horizontal force at which the lock pin 40 breaks.

  (3) By forming the storage portion 21 with acrylic or the like to increase the transparency of the storage portion 21, the broken portion of the shaft portion 41 of the lock pin 40 is visually confirmed through the side surface of the storage portion 21, and the operation history And when to replace the lock pin.

  (4) Since the groove 43 is provided at the breakage point of the lock pin 40, the breakage state can be confirmed by pulling out the lock pin 40 from above and visually recognizing the groove, so the necessity of replacing the lock pin can be easily examined.

[Second Embodiment]
FIG. 4 is a cross-sectional view of the seismic isolation device 10A according to the second embodiment of the present invention.
In the present embodiment, the shape of the lock pin 50 is different from that of the first embodiment.
That is, the lock pin 50 includes a rod-shaped shaft portion 51 and locking portions 52 provided on both ends of the shaft portion 51.
Each locking portion 52 is made of an elastically deformable material, and protrudes in a hook shape from the shaft portion 51 in a direction opposite to each other.
The distal end side of the shaft portion 51 has a shape that becomes narrower toward the distal end.

  The lock pin 50 is attached as follows. That is, as shown in FIG. 5, the upper end side of the shaft portion 51 is picked, and the shaft portion 51 is moved to the upper through hole 31 and the lower portion until the lower locking portion 52 is locked to the lower edge of the lower through hole 22. Push into the through hole 22. Thus, the shaft portion 51 is inserted into the upper through hole 31 and the lower through hole 22, and the upper and lower locking portions 52 are locked to the upper end edge of the upper through hole 31. At this time, since the upper and lower engaging portions 52 are inclined in the direction facing each other, the upper and lower engaging portions 52 are elastically deformed by being pressed by the upper surface of the upper through hole 31 and the lower surface of the lower through hole 22. Tension is acting.

  In the seismic isolation device 10A, when a large earthquake occurs to some extent and a horizontal force of a predetermined value or more acts on the seismic isolation device 10A as shown by the white arrow in FIG. 6, as shown in FIG. The shaft portion 51 of the lock pin 50 is sheared and broken at the breakage portion, and the upper portion 30 and the lower portion 20 can be moved relative to each other, and the seismic isolation mechanism operates.

  At this time, the portion 51A below the broken portion of the shaft portion 51 of the lock pin 50 protrudes downward from the lower through hole 22 to the storage portion 21 due to the restoring force of the lower locking portion 52. The portion 51 </ b> B that is housed and is above the breakage portion of the shaft portion 51 floats upward from the upper through hole 31 due to the restoring force of the upper locking portion 52.

According to this embodiment, in addition to the effects (1) to (3) described above, the following effects can be obtained.
(5) When the shaft portion 51 of the lock pin 50 is broken, the portion 51B above the broken portion of the shaft portion 51 is lifted upward from the upper through hole 31 by the restoring force of the upper locking portion 52. It is possible to easily determine that the lock pin 50 is broken simply by visually checking 50 from above.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

1 ... Manufacturing equipment (equipment)
2 ... Floor surface 10, 10A ... Seismic isolation device 20 ... Lower part 21 ... Storage part 21A ... Ceiling surface 22 ... Lower through hole 30 ... Upper part 31 ... Upper through hole 40, 50 ... Lock pin 41, 51 ... Shaft part 42, 52 ... Locking part 43 ... Groove

Claims (3)

A lower part fixed to the floor, an upper part provided on the lower part to support the device from below, a seismic isolation mechanism that allows relative movement in the horizontal direction between the upper part and the lower part, the upper part and the upper part A lock pin that locks relative movement with the lower part,
The upper part is formed with an upper through-hole penetrating the upper part up and down,
In the lower part, a substantially box-shaped storage part made of a transparent material is formed,
The lower part is formed with a lower through hole that penetrates the lower part up and down and reaches the ceiling surface of the storage part,
The lock pin includes a rod-shaped shaft portion, and a locking portion provided on the base end side of the shaft portion,
The said shaft part is inserted in the said upper through-hole and the said lower through-hole, and the said latching | locking part latches to the upper end edge of the said upper through-hole. A lower part fixed to the floor, an upper part provided on the lower part to support the device from below, a seismic isolation mechanism that allows relative movement in the horizontal direction between the upper part and the lower part, the upper part and the upper part A lock pin that locks relative movement with the lower part,
The upper part is formed with an upper through-hole penetrating the upper part up and down,
In the lower part, a substantially box-shaped storage part is formed,
The lower part is formed with a lower through hole that penetrates the lower part up and down and reaches the ceiling surface of the storage part,
The lock pin includes a rod-shaped shaft portion and a pair of locking portions provided on both end sides of the shaft portion,
The shaft portion is inserted into the upper through hole and the lower through hole,
The pair of locking portions are formed of an elastically deformable material, and protrude from the shaft portion so as to be opposed to each other, and are formed at the upper end edge of the upper through hole and the lower end edge of the lower through hole. Seismic isolation device characterized by locking. The seismic isolation device according to claim 2, wherein the storage portion is formed of a transparent material.

Images