JP2001141556A - Seismograph - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily conveyable and mountable seismograph surely detecting seismic vibration. SOLUTION: In a seismograph with an inside casing 3 inside an outside casing 4 freely oscillationally by means of a hanging shaft 22, a hanging shaft locking member 22 having a hanging shaft insertion hole 21a in the lower end is arranged in the lower face central part of a lid member 15 in the outside casing 4, while an internal space of the hanging shaft locking member 22 is filled with viscous fluid 23. The hanging shaft 22 is provided with a shank part 22a fixed to the inside casing 3 at the lower end, a locking part 22b arranged in the upper end of the shank part 22a and formed into a swelling shape, and a blade part 22c formed in the upper part of the locking part 22b and protruded laterally. The shank part 22a is freely inserted through the hanging shaft insertion hole 21a, the locking part 22b is locked in the hanging shaft insertion hole 21a, and the blade part 22c is positioned inside the viscous fluid 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic sensor mounted on various devices and devices such as gas meters, oil heaters, elevators, chemical plants, railways, etc. for the purpose of detecting seismic motion and preventing various disasters. Related to the device.

[0002]

2. Description of the Related Art
As this type of seismic device, as shown in FIG. 8, a seismic sensor main body (51) having a seismic motion detecting mechanism includes a suspension shaft (52).
There is known a seismic device that is swingably hung on an attachment body (53). The seismic device comprises a liquid sealing chamber (5) having a hanging shaft insertion hole (54) in the mounting body (53).
5) is provided, and a viscous fluid (5) is provided in the liquid sealing chamber (55).
While the suspension shaft (52) is filled, the suspension shaft (52) has a lower end fixed to the center of the upper end of the seismic sensor main body (51), and a lower end attached to the upper end of the shaft (52a). A locking portion (52b) formed in a bulging shape, and a laterally extending wing portion (52c) at an upper end of the locking portion (52b), wherein a shaft portion (52a) is provided with the insertion hole. (54), the locking portion (52b) is locked to the upper edge of the insertion hole (54), and the wing portion (52c) is located in the viscous fluid (56). .

According to this seismic device, the seismic sensor main body (51) having the seismic motion detecting mechanism is swingably hung by the suspension shaft (52), so that it can be mounted in a slightly inclined state. The seismic sensor main body (51) is always kept in a vertical state. Further, since the wing portion (52c) provided above the suspension shaft (52) is located in the viscous fluid (56) filled in the liquid seal chamber (55), the seismic sensor body (51) is provided. )
Is allowed under the regulated state, while the seismic motion is transmitted to the seismic sensor main body (51) accurately.

However, the seismic sensor body (5
1) If the suspension shaft (52) and the mounting body (53) are arranged in an exposed state, respectively, the seismic device will be inconsistent as a whole and the stability of the seismic device will be poor. In such a case, external shocks are directly applied to the seismic sensor body, so careful attention must be paid to the installation and transportation of the seismic device, and the work efficiency in mounting and transporting the seismic device is reduced. was there.

[0005] The present invention has been made in view of the above-described problems, and has as its object to provide a seismic device capable of reliably detecting seismic motion and easy to transport and mount.

[0006]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a seismic device in which a seismic sensor body having an earthquake detecting mechanism is swingably suspended in an outer casing by a suspension shaft. A suspension shaft locking member having a closed internal space and a suspension shaft insertion hole at a lower end is provided at a central portion of an upper end of the outer casing, and a suspension shaft locking member of the suspension shaft locking member is provided. While the viscous fluid or the granular material is filled in the internal space, the suspension shaft has a lower end fixed to the seismic sensor main body, and a bulge formed at the upper end of the shaft. Part, and a wing part formed in a laterally projecting shape on the upper part of the locking part, a shaft part is loosely inserted into the suspension shaft insertion hole, and the locking part is the suspension shaft insertion hole. And the wings are located in the viscous fluid or the granular material.

According to this, the seismic sensor main body having the seismic motion detection mechanism is swingably hung by the suspension shaft, so that the seismic sensor main body is always in a vertical state even when mounted in a slightly inclined state. Will be retained. In addition, since the wing provided on the upper part of the suspension shaft is located in the viscous fluid or the granular material filled in the internal space of the suspension shaft locking member, the tilting of the seismic sensor body is restricted. While allowed below, the swinging of the seismic element main body is regulated, and the seismic motion is accurately transmitted to the seismic element main body. Furthermore, since all members such as the seismic sensor main body, the suspension shaft, and the suspension shaft locking member are housed in the outer casing, the entire seismic device is integrated and the stability of the seismic device is improved. In addition, the seismic sensor body and the like in the outer casing are protected from external impacts during transportation and the like.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the seismic device according to the present invention is applied to a gas meter seismic device will be described below.

The seismic device of the embodiment shown in FIGS.
An inner casing (3) provided with a switch (2) at the top while the seismic ball (1) is housed therein is always kept horizontal in the outer casing (4), and swinging is limited. It is hung in the state where it was carried out.

The inner casing (3) has a recess (5) formed at the center of the inner bottom surface and has a diameter of about 11.1.
A 1 mm steel seismic ball (1) made of steel or the like is normally housed while being held on the recess (5). As shown in FIG. 6, the concave portion (5) has a concave portion (5a) at the center.
Are formed, and a total of 12 ridges (5b) having a triangular cross section whose apex angle is set to about 140 degrees so that adjacent ones from the recess (5a) form an angle of about 30 degrees are radially formed. Is formed. The diameter of the recess (5a) may be appropriately set according to the vibration to be detected.
In order to detect a vibration of 5 gal, the diameter is 1.87 mm
It should just be set to about. Each ridge (5b) is set to have a gentle upward slope of about 3 to 4 degrees or less toward the outside. Such radial ridges (5b)
Is formed so that the seismic sphere (1) has the convex shape (5).
The reciprocating operation is performed accurately along b), and the vibration can be detected more accurately. In addition, each ridge (5b)
Is formed into a triangular cross section, so that the seismic sphere (1)
Is in point contact with each ridge (5b),
It is possible to adopt a ball smaller than the conventional product as the seismic ball (1).

A small ball receiver (6) whose lower surface is formed as a concave spherical surface corresponding to the seismic sphere (1) is provided on the inner upper part of the inner casing (3) at a distance from the seismic sphere (1). It is fitted in a state where it is locked at a position where it will be in a state. The small ball receiver (6) has a total of six holes having a diameter of about 2.6 mm at regular intervals along the circumferential direction at positions equidistant from the center thereof, as shown in FIGS. (6a) is drilled in a vertically penetrating state, and as shown in FIG. 1, a small ball (7) for operating a contact piece made of steel or the like having a diameter of 2.5 mm is fitted into each of the holes (6a). Have been. In this fitted state, each small ball (7) is locked and held by the reduced diameter portion (6b) at the lower end while slightly projecting below the lower opening of each hole (6a), and can be moved up and down. ing. An opening / closing switch mounting projection (6c) is provided at the center of the upper surface of the small ball receiver (6), and the opening / closing switch includes a pair of upper and lower electrode pieces (8) and (9). (10) is fixed.

This open / close switch (10) is shown in FIG.
As shown in (b), six movable pieces (8b) are radially extended from the central portion (8a) so that adjacent ones form an angle of 60 degrees with each other, and one movable piece (8b) extends from between them.
An upper electrode piece (9) having a lower electrode piece (8) having a plurality of narrow width drawing pieces (8c) extended therefrom, and a contact piece (9b) and a drawing piece (9c) having shapes substantially corresponding thereto. It is composed of The movable contact piece (8b) includes the small ball receiver (6).
It is necessary to have a length that can cover the upper part of the corresponding hole (6a), and that adjacent ones have the same phase as the hole (6a). The two electrode pieces (8)
As (9), from the viewpoints of electrical characteristics (low contact resistance), strength (durability), flexibility (flexibility or sensitivity) and the like, a Cu-Be alloy ultra-thin sheet material having a thickness of about 0.03 mm is used. After punching in the above shape and applying gold plating, a material subjected to heat treatment is preferably used. Thus, as shown in FIG.
The lower electrode piece (8) is positioned at the center (8a) of the small ball receiver (6) such that each movable contact piece (8b) is located on each hole (6a) of the small ball receiver (6). ) Switch mounting projections (6
c), and is fitted and fixed on the upper part with an insulating washer (1).
The upper electrode piece (9) is connected to the movable contact piece (8) of the lower electrode piece (8) so that the upper electrode piece (9) is in the proximity and separated state via 1).
It is fitted and fixed in the same phase as in b) and with the drawer pieces pulled out in opposite directions. In the drawing, (9d) is a contact formed on the movable contact piece (9b).

Here, the seismic ball (1) and each of the small balls (7) are in a very close distance of about 0.2 mm, and the seismic ball (1) rolls in the casing. At this time, the seismic sphere (1) comes into contact with the small ball (7) at the corresponding position, and the small ball (7) is pushed up. The pushed small ball (7) pushes up the corresponding movable contact piece (8b) of the lower electrode piece (8), and the movable contact piece (8b) pushes the corresponding contact piece of the upper electrode piece (9). Touch the piece (9b). When the shaking disappears and the rolling of the seismic ball (1) ends, the seismic ball (1)
The small ball (7) and the movable contact piece (8b) return to their original positions, respectively, and prepare for the detection of the next vibration.

A lid (12) is fitted and fixed to the upper end opening of the inner casing (3). This lid material (1
In the center of the upper surface of 2), a suspension shaft (22) to be described later is fixedly planted in an upwardly projecting shape, and the suspension shaft (22) is attached to a lid (15) of an outer casing (4) to be described later. The inner casing (3) is swingable with respect to the outer casing (4) by being locked by the provided suspension shaft locking member (25).

On the other hand, as shown in FIG. 1, the outer casing (4) is formed in such a size that the inner casing (3) can be slidably accommodated therein, and has a substantially cylindrical body (24). ) And a lid (15) for closing the upper end opening. A cylindrical member (20) having a lower end opening is provided at the center of the lower surface of the lid member (15), and a lower end opening of the cylindrical member (20) is provided at the lower end opening.
A suspension shaft insertion hole (21) for inserting the suspension shaft (22)
The lid (21) having a) is fitted, and the cylindrical member (20) and the lid (21) constitute a suspension shaft locking member (25).

The suspension shaft (22) has a shaft part (22a) fixed at its lower end to a lid member (12) of the inner casing, and a lower half having a bulging spherical shape at the upper end of the shaft part (22a). A locking portion (22b) is formed, and a wing portion (22c) formed at the upper end of the locking portion in a laterally projecting shape and having an outer diameter slightly smaller than the inner diameter of the cylindrical member (20). . And
A shaft portion (22a) is loosely inserted into the insertion hole (21a) formed in the center of the lid (21), and the locking portion (22b) is inserted into the corresponding spherical insertion hole (21a). Locked. According to this suspension structure, the inner casing (3) is swingably hung on the suspension shaft (22).
Inner casing (3) even when mounted in a slightly inclined state
Is always kept vertical.

The cylindrical member (20) and the cover (2)
1) is filled with a viscous fluid (23), and the wings (22c) of the suspension shaft (22) are located in the viscous fluid (23). As the viscous fluid (23), the inner casing (3) can be always kept horizontal, and the vibration can be transmitted efficiently.
It is necessary to satisfy various conditions such that the performance does not deteriorate over a long period of time and there is no risk of oil leakage. For example, silicone oil having a viscosity of about 10,000 (cP) is preferably used. According to this, the wings (22) of the suspension shaft (22)
c) receives moderate resistance due to the viscous fluid (23), so that the tilting of the inner casing (3) is allowed under the regulated state, while the swing of the inner casing (3) is regulated, and the seismic motion is reduced. Accurately transmitted to (3). Further, since all members such as the inner casing (3), the suspension shaft (22), and the suspension shaft locking member (25) are housed in the outer casing (4), the entire seismic device becomes a unit. In addition to improving the stability of the seismic device, the outer casing (4) is protected from impacts during transportation.
The inside members are protected, and work efficiency in mounting and transporting the seismic device is improved.

The outer casing (4) is integrally provided with bulges (4b) extending in the axial direction at four positions on the outer peripheral surface thereof with a phase difference of 90 degrees. At the lower end of the pair of opposing bulges (4b), (4b), an insertion fixing leg (4c) for the printed circuit board on the mounting side is integrally extended. The other pair of bulges (4b) (4
In (b), conductive terminal rods (17) and (17) are press-fitted in a buried state, respectively.
At the upper end of 7), the pull-out pieces (8c) and 9c) of the open / close switch (10) pulled out from the inner casing (3) are connected by riveting, respectively, and at the lower end thereof are inverted L-shaped terminal plates (18) and (9). 18) is fixed in a downward projecting shape.

In this embodiment, the suspension shaft locking member (25) is divided into the cylindrical member (20) and the lid (21). However, the present invention is not limited to this. Good.

Further, instead of the viscous fluid (23), a granular material may be filled in the suspension shaft locking member (25), and the strip plate (14) and the lid ( 12), a swing regulating member such as a conical spring which does not hinder the centering action may be interposed. In particular, when the granular material is filled in the suspension shaft locking member (25), it is desirable that the wings of the suspension shaft (22) are formed so as to extend radially from the center portion.

In addition, the suspension shaft locking member (25) is provided directly on the lid (15) of the outer casing (4). However, the present invention is not limited to this. For example, a band plate may be provided on the upper part of the outer casing (4). The suspension may be provided in the radial direction, and the suspension member (25) may be provided on the strip.

Further, the present invention is not limited to the seismic device for gas meters as shown in the above embodiment, but may be applied to various devices and devices such as oil stoves, elevators, chemical plants, railways, etc. It may be suitable for an apparatus.

[0023]

According to the present invention, the seismic sensor body having the seismic motion detection mechanism is swingably hung by the suspension shaft, so that even when the seismic sensor body is slightly inclined, the seismic sensor body is always kept. It is held vertically.

Further, the wing provided on the upper part of the suspension shaft
Since it is located in the viscous fluid or granular material filled in the internal space of the suspension shaft locking member, the tilting of the seismic sensor body is allowed under the regulated state, while Is controlled, and the seismic motion is accurately transmitted to the seismic sensor body.

Further, since all members such as the seismic sensor main body, the suspension shaft, and the suspension shaft locking member are housed in the outer casing, the entire seismic device is integrated and the stability of the seismic device is improved. In addition to the improvement, the seismic sensor body inside the outer casing is protected from impacts during transportation, etc.
Work efficiency in mounting and transporting the seismic device is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a seismic device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the seismic device.

FIG. 3 is a plan view showing the seismic device with an outer lid removed.

FIG. 4 is a sectional view of a small ball receiver.

FIG. 5 is a plan view of an upper electrode piece and a lower electrode piece.

FIG. 6 is a plan view of an inner casing.

FIG. 7 is a sectional view of the inner casing.

FIG. 8 is a sectional view showing a conventional seismic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sensing ball 3 ... Inner casing 4 ... Outer casing 7 ... Small ball 8 ... Lower electrode piece 8b ... Movable contact piece 9 ... Upper electrode piece 12 ... -Lid 20-Cylindrical member 21-Lid 22-Hanging shaft 22a-Shaft 22b-Locking portion 22c-Wing 23-Viscous fluid 25- ..Suspension shaft locking members

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Michio Nishi 2-10-16 Higashiobashi, Higashinari-ku, Osaka Kansai Gas Meter F-term (reference) 2G064 AB19 BA24 BB10 BB11 BB21 BB39 BB61 DD32 5G056 BD04 BD13 BD22 BE37 BE51

Claims (1)

[Claims] 1. A seismic device in which a seismic sensor main body having an earthquake detecting mechanism is swingably suspended in an outer casing by a suspension shaft, and a closed upper part is provided at a center of an upper end of the outer casing. A suspension shaft engaging member having an internal space and having a suspension shaft insertion hole at a lower end is provided, and the internal space of the suspension shaft engaging member is filled with a viscous fluid or a granular material, The suspension shaft has a lower end fixed to the seismic element main body, a locking portion formed in a bulging shape on an upper end of the shaft portion, and a laterally projecting shape formed on an upper portion of the locking portion. A shaft portion is loosely inserted into the suspension shaft insertion hole, a locking portion is locked to a peripheral portion of the suspension shaft insertion hole, and the wing portion is the viscous fluid. Or a seismic device characterized by being located in a granular material.