JP3289206B2 - Seismic sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration sensor, and more particularly, to a steel ball type vibration sensor.

[0002]

2. Description of the Related Art FIG. 14 is a cross-sectional view of a conventional steel ball type seismic sensor, and FIG. 15 is a cross-sectional view as viewed from the side.

[0003] the top opening of the outer case 1 _0, and fitting coupling the cap 3 ₀ comprising an oil damper 2 housing 4
Is configured. This outer casing 1 _0, slightly with a small diameter of the opening 5 is formed in the bottom center, the terminal 6 drawn along the inner peripheral surface is deployed. Cap 3
₀ , the oil damper 2 is provided with an annular mounting member 7.
It is attached via the in the upper part of the cap 3 _0, cap seal 8 which seals the oil is deployed.

[0004] the outer case 1 ₀ and the cap 3 consists housing 4, the steel ball 9 ₀ housed a bottomed cylindrical inner case 10 ₀ of the upper opening, displaceably supporting the plunger 11 The seismic sensor body formed by fitting and connecting the base member 13 via the first guide member 12 is housed.

[0005] the base member 13, movable piece 1 is displaced by operation of the plunger 11 due to the movement of the steel ball 9 ₀
4, and a contact 15 and a terminal portion 16 with which the movable piece 14 contacts and separates are provided. Further, the upper portion of the base member 13, the second guide member 17 ₀ are deployed, to the second guide member 17 _0, the beam 18 for supporting the seismoscope body, via a fulcrum 19 through Supported. The beam 18, the outer case 1 ₀ and the cap 3 ₀
, And the main body of the seismic sensor is stored in the housing 4 to constitute a so-called automatic horizontal seismic device.

[0006] In seismic device having such a configuration, when the steel ball 9 ₀ is moved by vibrations, the plunger 11 is actuated to displace the movable piece 14 in the vertical direction, the movable piece 14 is in contact or spaced apart from the contact 15 Thus, an on / off signal is output.

[0007]

FIG. 16 is an enlarged view near section A in FIG.

[0008] In the conventional example of sensitive seismic vessel, the steel ball 9 _0, the A steel ball 9 ₀ inner surface of the case 10 ₀ among housed, and the surface is smooth finish so friction is reduced. Therefore, the steel ball 9 _0. slip got occurs between the inner case 10 ₀ and the steel ball 9 ₀ can not be moved quantitatively, on-off output waveform outputted with the movement of the steel balls 9 ₀ Cracking, chipping or chattering may occur.

[0009] For example, in the case as to apply a vibration of predetermined frequency, as shown in the output waveform of Figure 17, steel operating point of the steel ball 9 ₀ contacts is turned on (ON point) and the contact is turned off return point of the sphere 9 ₀ (oFF point) and variation, Therefore, there is a drawback in that the on-time and off-time is not constant.

The present invention has been made in view of the above technical problems, and provides a seismic sensor having improved reliability by preventing cracking, chipping or chattering of an output waveform due to sliding of a steel ball. The purpose is to do.

[0011]

In order to achieve the above-mentioned object, the present invention is configured as follows.

That is, according to the present invention, in a steel ball type seismic device in which a steel ball is housed in a case and a contact is turned on and off as the steel ball moves, the steel ball moves. The bottom of the case is formed roughly and
The bottom is the initial position where the steel ball is located before the vibration is applied
A first inclined surface extending outward from the first inclined surface, and continuous with the first inclined surface
And a second inclination angle larger than the first inclination surface.
And an inclined surface.

Further, the surface of the steel ball may be formed to be rough together with the bottom surface of the case.

[0014]

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of a seismic sensor according to an embodiment of the present invention, and FIG. 2 is a sectional view as viewed from the side thereof. With reference numerals.

A housing 4 is formed by fitting and connecting a cap 3 having an oil damper 2 to an upper opening of the outer case 1. The outer case 1 has a slightly small-diameter opening 5 formed in the center of the bottom surface thereof, and a terminal 6 extending to the outside along the inner peripheral surface. Cap 3
The above-mentioned oil damper 2 is mounted via an annular mounting member 7, and a cap seal 8 for sealing oil is provided above the cap 3.

A first guide for displaceably supporting a plunger 11 in an upper opening of a bottomed cylindrical inner case 10 in which a steel ball 9 is accommodated in a housing 4 formed of an outer case 1 and a cap 3. Base member 13 via member 12
The seismic sensor main body formed by fitting and connecting is fitted.

A movable piece 14 displaced by the operation of the plunger 11 accompanying the movement of the steel ball 9 is provided on the base member 13.
Are provided, and a contact 15 and a terminal portion 16 with which the movable piece 14 contacts and separates are provided. A second guide member 17 is provided above the base member 13, and a beam 18 for supporting the seismic sensor body is inserted and supported through the fulcrum 19 on the second guide member 17. ing. The beam 18 is suspended between the outer case 1 and the cap 3 so that the seismic sensor main body is housed in the housing 4.
A so-called automatic horizontal seismic sensor is configured.

The above configuration is basically the same as the above-mentioned conventional example.

The seismic sensor of this embodiment is configured as follows in order to prevent cracking, chipping or chattering of the on / off output waveform due to slippage of the steel ball 9 and to enhance reliability.

FIG. 3 is an enlarged view of the vicinity of section A in FIG. 1. As shown in FIG. 3, in this embodiment, the bottom surface of the inner case 10 in which the steel balls 9 are stored and the steel balls are shown. 9 has a rough surface.

The inner case 10 having a bottom with a desired roughness can be obtained, for example, by making the surface of a mold for manufacturing the inner case 10 to a desired roughness by electric discharge machining or the like.

The steel ball 9 having a desired surface roughness can be obtained by, for example, barrel polishing or satellite (matting).

Thus, by forming the bottom surface of the inner case 10 and the surface of the steel ball 9 roughly, slipping of the steel ball 9 can be prevented, and cracking, chipping or chattering of the output waveform of the conventional example can be prevented. Can be improved.

Further, in this embodiment, the inclination of the bottom surface of the inner case 10 is set so that the outer position is larger than the initial position (return position) where the steel ball 9 is located before the vibration is applied. It is formed as follows. That is, from the center of the bottom surface of the inner case 10, which is the initial position, to a predetermined distance D,
Has a first inclined angle theta ₁ of the first inclined surface 10a, the outer person has a second inclined angle theta ₂ second inclined surface 10b of (θ ₁ <θ _2).

With such a configuration, a force for returning the steel ball 9 to the initial position can be forcibly applied to the steel ball 9, whereby the operating point (on point) of the steel ball 9 at which the contact is turned on can be reduced. The return point (off point) at which the contact turns off can be stabilized.

FIG. 4 is a waveform diagram of an on / off output when a constant frequency vibration is applied to the seismic sensor of this embodiment. According to this embodiment, as shown in FIG.
It is possible to obtain a stable output with a constant on-time and off-time.

The inclination angle and the range of the bottom surface of the inner case 10 are experimentally selected according to the surface roughness and the surface roughness of the steel ball 9 so that the desired effect can be obtained. can do.

[0030]

FIG. 5 is an enlarged view of the vicinity of section B in FIG.

A beam 18 for supporting a seismic sensor body comprising an inner case 10 containing a steel ball 9 and a base member 13 and the like.
Is laid on the housing 4 so as to cross over the base member 13 and a fulcrum 19 at the center of the beam 18
The convex portion 19a of the second guide member 17 is
Is engaged.

The second guide member 1 of the conventional example shown in FIG.
In 7 _0, it is formed in the recess 17 ₀ a bunk, a depth of a portion in engagement becomes shallow. For this reason, the conventional example of FIG. 6, such as by an impact, the fulcrum 19, disengaged from the recess 17 ₀ a of the second guide member 17 _0, deviates the center of gravity position misaligned beams 18, as a result, steel There were disadvantages in that the operating point (on point) of the ball 9 and the return point (off point) varied, and the on / off output waveform became unstable.

In this embodiment, in order to solve such a problem, as shown in FIG. 5, the periphery of the inclined recess 17a of the second guide member 17 is formed so as to protrude downward. The projection 19a is formed so as not to easily come off the inclined recess 17a of the second guide member 17.

As a result, it is possible to effectively prevent the fulcrum 19 of the beam 18 from being disengaged from the second guide member 17 and displacing the center of gravity due to impact or the like as in the conventional example.

FIG. 7 is an enlarged view near section C of FIG.

The second member attached to the base member 13
Guide member 17, its upper is to be mounted so as to be pressed by the rubber 20 of the oil damper 2 of the inner surface of the cap 3, the second guide member 17 ₀ of the conventional example shown in FIG. 8, the upper contour is formed substantially frustoconical, Therefore, it increases a gap between the rubber 20 and the second guide member 17 ₀ this leads to a variation in the positional relationship between the rubber 20 and the second guide member 17 ₀ Therefore, the damping efficiency of the oil damper 2 also varies, which is an obstacle to stable operation.

Therefore, in this embodiment, as shown in FIG. 7, the outer shape of the upper portion of the second guide member 17 is substantially cylindrical.
Variations in the positional relationship between 0 and the second guide member 17 are prevented to stabilize the on / off output.

FIG. 9 is an enlarged view near section D in FIG. 1, and FIG. 10 is a side sectional view thereof.

A beam 18 for supporting the seismic sensor body consisting of the inner case 10 in which the steel balls 9 are stored, the base member 13 and the like.
The cap 3 so as to cross over the base member 13.
And although of being mounted is to be laterally placed on the housing 4 consisting of an outer casing 1 Prefecture, in the conventional example shown in FIGS. 11 and 12, the lower surface of the cap 3 ₀ is formed in a planar shape, the outer upper surface of the case 1 ₀ has a recess 1 ₀ a corresponding to the thickness of the beam 18. Therefore, in the conventional example, the beam 18, when attached to the housing 4 consisting of a cap 3 ₀ and the outer case 1 _0, as shown in FIG. 13, attached while misaligned to tilt beam 18 There was a disadvantage that the on / off output became unstable.

Therefore, in this embodiment, FIG. 9 and FIG.
As shown in FIG. 0, a convex portion 3 a for pressing the beam 18 to a predetermined position is formed on the lower surface of the cap 3 while the outer case 1 is formed.
Is formed with a concave portion 1a having a thickness corresponding to the thickness of the beam 18 and the convex portion 3a. Thereby, the convex portion 3a of the cap 3 and the concave portion 1a of the outer case 1 are formed.
The beam 18 can be securely sandwiched and attached between them, and if there is a positional shift as in the conventional example, it can be grasped. Therefore, the positional shift can be corrected and mounted. , Stable operation can be performed.

In the above-described embodiment, both the bottom surface of the inner case 10 and the surface of the steel ball 9 are formed rough, but as another embodiment of the present invention, only the bottom surface of the inner case 10 may be formed rough. .

[0043]

The present invention is naturally applicable not only to the automatic horizontal seismic sensor but also to other steel ball type seismic sensors.

[0045]

As described above, according to the present invention, in the steel ball type seismic device, at least the bottom surface of the case in which the steel ball moves is formed roughly, so that the on-off output waveform of the steel ball slips. Cracking, chipping, chattering, etc. can be prevented to improve reliability.

Further , vibration is applied to the bottom of the case.
Extends outward from the initial position where the steel ball is located before
A first sloping surface, the first sloping surface being continuous with the first sloping surface;
A second inclined surface having a larger inclination angle than the inclined surface.
Therefore, the ON point, which is the operating point of the steel ball, and the OFF point, which is the return point, are stabilized, and the reliability can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

FIG. 2 is a cross-sectional view as viewed from the side in FIG.

FIG. 3 is an enlarged view near section A in FIG. 1;

FIG. 4 is an output waveform diagram of the embodiment of FIG.

FIG. 5 is an enlarged view near section B in FIG. 1;

FIG. 6 is an enlarged view corresponding to FIG. 5 of a conventional example.

FIG. 7 is an enlarged view near section C of FIG. 1;

FIG. 8 is an enlarged view corresponding to FIG. 7 of a conventional example.

FIG. 9 is an enlarged view near section D in FIG. 1;

FIG. 10 is a side sectional view of FIG. 9;

FIG. 11 is an enlarged view corresponding to FIG. 9 of a conventional example.

FIG. 12 is an enlarged view corresponding to FIG. 10 of a conventional example.

FIG. 13 is an enlarged view showing a problem of the conventional example.

FIG. 14 is a sectional view of a conventional example.

FIG. 15 is a cross-sectional view as viewed from the side in FIG. 14;

FIG. 16 is an enlarged view near section A in FIG. 14;

FIG. 17 is an output waveform diagram of a conventional example.

[Explanation of symbols]

1,1 ₀ outer case 3,3 ₀ caps 9,9 ₀ steel balls 10, 10 ₀ in the case 11 the plunger 14 movable piece 13 the base member 18 Beam

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-147965 (JP, A) JP-A-2-181614 (JP, A) JP-A-2-186224 (JP, A) JP-A-2-186 181616 (JP, A) JP-A-53-125079 (JP, A) JP-A-61-48634 (JP, U) JP-A-62-184717 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) G01H 1/00

Claims (2)

(57) [Claims] 1. A steel ball type seismic device in which a steel ball is housed in a case and a contact is turned on and off with the movement of the steel ball. Coarsely formed or
The bottom of the case holds the steel ball before vibration is applied.
A first inclined surface extending outward from an initial position to be placed;
Continuing from the first inclined surface, the inclination angle is larger than the first inclined surface
A seismic sensor having a second inclined surface having a large degree . 2. The movement of the steel ball on the upper part of the case
A plunger that operates with the plunger.
The seismic sensor according to claim 1, wherein the contact is turned on / off .