JPH0346769B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention aims to selectively grasp generated vibrations and accurately sense grasping vibrations by interposing a spring and interposing a weight disk as a swinging member. The present invention relates to the disclosure of a sensing device.

Therefore, in the past, this type of vibration sensing device generally grasped the vibration amplitude as a change in electrical, magnetic, optical, or mechanical pressure, measured the vibration directly, or measured it directly. It is designed to be input as an electrical signal to various other measurement or alarm devices.

In the present invention, the structure of vibration sensing in such a conventional example is understood as a oscillation width within a spherical surface that has little directionality and allows the operating width to be set relatively precisely and easily. In addition, the degree of the vibration width generated is converted into the sound of contact with the wall surface and sensed, and vibrations that are particularly gentle within a certain width and particularly minute vibrations of the vibration width are eliminated in advance,
By sensing only vibrations within a certain target range, it is possible to reliably avoid the problem of poor sensing due to the directionality of vibration, which was a problem with conventional sensing methods, and to detect vibrations within a certain target range. Furthermore, by simplifying the sensing device itself, it can be made cheaper and more robust, and the risk of mechanical malfunction can be reliably avoided. be. In order to achieve specific effects on these characteristics, the present invention has a structure in which a swinging member is fixed to the free end of a spring attached to an object to be vibration sensed, and the swinging member is The member has an inner circumferential wall surface on which a loaded vibration-sensing ball rolls, and a vibration-sensing body with a microphone attached to the outer circumferential wall surface is fixed thereto. Changes are planned.

Hereinafter, details of the present invention will be described with reference to a typical embodiment shown in the drawings. Reference numeral 1 indicates a perfectly spherical vibration sensing body using a steel ball or the like as a basic example, and 2 represents the sensing body 1.
The material, size, mutual diameter ratio, etc. are freely set according to the intended sensing mechanism.

Therefore, the sensing body 2 is generally designed to be able to reasonably eliminate the generation of contact noise, and to ensure the smooth operation of the vibration sensing body 1, the inner wall operating surface has a certain rounded surface, and the material is In addition, the wall thickness is determined appropriately, and the rolling circumferential surface of the sensing element 1 is planned to be a true sphere for the purpose of eliminating any directionality, especially regardless of the installation mode. It is what was done.

It was also separately planned to configure the sensing body 2 with a so-called pan-bottom rounded surface that rises from the center of the bottom and gradually becomes steeper toward the wall.

In addition, by making the circumferential surface of the sensing body 1 in the description a rough surface such as an uneven surface, or by making the inner wall surface of the container 2 similarly rough, the amplitude at which the sensing body 1 should operate can be kept constant. It is also planned, if necessary, to limit the range to a certain range and induce sudden activation by exceeding a certain range to ensure reliable sensing.

A microphone 3 is attached to the outer circumferential surface of the container 2 having such a structure, and the sound of the contact between the sensing member 1 and the container 2 is captured, and the vibration sensing mechanism itself rotates with an equal vibration width. 2 is arranged opposite to the container 2 in case the structure with the sensing device itself rolls.
It was planned that separate microphones 3 and 3 would be installed and used, and by installing such microphones 3 and 3 on both sides, vibration-repelled sound can be captured more reliably and the installation space will be saved. This makes it possible to install the device even when the temperature is particularly low.

The microphone 3 is selected and used as appropriate depending on the type of vibration to be sensed or in consideration of manufacturing cost regulations, and is generally a carbon microphone or a dynamic microphone. , magnetic microphones, crystal microphones, condenser microphones, etc., have been used, and various mounting structures have been considered in order to improve their sensing functions.

Especially in such a mounting structure, the microphone 3
There was a need to solve the problem of the installation position, as well as the problem of blocking external noise and buffering the mounting end surface.

In response to such requirements, the outer circumferential surface of the container 2 is usually surrounded with a sound insulating material 4 made of rubber material, resin material, various foam materials, etc., to reduce the detection of external sounds as much as possible and to reduce the inherent vibrations of attached equipment, etc. Alternatively, the unique vibration generated by the mounting end surface is removed, and the inherent vibration of the attached equipment whose vibration is to be detected is reliably captured.

In addition to the sound insulating structure of the sound insulating material 4, it also eliminates minute vibrations transmitted to the object to be sensed 5, especially vibrations caused by light knocks on the object to be sensed, as well as vibrations with gentle waves. The container 2 constructed as described above is supported by a coil spring 6 and a weight disk 7.

That is, the transmission of vibrations to the object to be sensed 5 is damped by the coil spring 6 and the weight disk 7, and particularly minute vibrations and gentle vibrations are eliminated. Such minute vibrations are relatively easily transmitted to the object to be sensed 5, and are also easily sensed by the microphone 3 as generated sound pressure. This has created a need to selectively detect vibrations within the range of vibrations to be detected.

Furthermore, when the object to be sensed shakes greatly and gently, sensing is not based on vibration transmission within the object to be sensed, but is based on the shaking of the object itself; It is sensed and activated by inducing the rolling of the sensing body 1, and it also needs to be erased when sensing within the vibration range that should be sensed.

In the present invention, in addition to capturing vibrations having an amplitude above a certain value and an amplitude density above a certain value, it is also possible to detect vibrations other than these vibrations by fine transmitted vibration waves or particularly gentle shaking. The operation is selectively erased before input to the microphone 3.

The expected buffering function of the coil spring 6 can be freely changed by changing the wire diameter and wire length of the spring 6, and is determined as appropriate depending on the type of vibration amplitude to be detected. It is something.

Next, the weight disk 7 attached to the free end of the coil spring 6 is specially designed to perform a so-called balance weight function to adjust the swing of the coil spring 6.
It further eliminates the minute vibrations induced in the spring 6, and when the vibration exceeds a certain value, it accumulates stress in the direction of the vibration, and when it reaches a certain value or more, a large amplitude movement is generated. This is to ensure the reliability of sensing.

From this point of view, the weight disk 7 is not necessarily limited to a disk having a uniform circumference, but it is sufficient to have a disk member of an appropriate shape. Regardless of other arbitrary shapes, it is expected that a certain balance weight function will be effective.

In addition, the attachment of the container 2 to the disk 7 does not necessarily have to be at the center of the disk 7, and it does not matter whether it is on the side edge of the disk 7 or on the top or bottom surface. This ensures that the spring 6 and the plate 7 can selectively capture the generated vibrations.

In addition, when installing the container 2, especially in a mounting method that avoids the center position of the board 7, the amplitude of the shaking caused by the fixed vibration captured by the board 7 is promoted along with the action of the board 7. , the functional effect in the presentation was considered to be more pronounced.

That is, by using the spring 6 and the plate 7, the generated vibrations are reliably sorted and grasped, and upon sensing the detected certain vibration, a sufficient shaking stress is first applied, and at the limit point, the The device operates to induce a rapid movement of the sensing body 1 to clarify the starting point of sensing, and the eccentric mounting particularly promotes the swinging width of the movement to eliminate any room for sensing errors.

In addition, in the case where the device described above is installed in the sound insulation box 8, the sensing operation due to external sounds is further prevented, and only the generated vibrations can be grasped and sensed. The box 8 structure makes it particularly easy to install the device.

That is, the sensing device according to the present invention basically includes a container 2 having a perfectly spherical internal cavity, and this container 2
By supporting the sensor in space with a spring 6, there is no need to consider the directionality in mounting or sensing.

The present invention has the configuration described above, in particular, the sensing body 1 is spherical, the sensing body 1 is rolled in the sensing body 2 which is a spherical surface, and the spring 6 of such body 2 is used. By using a buffer holding structure and using a sensing device that uses the contact sound of these two as an input signal, it is possible to expect specific effects on the various characteristics described above, and it is possible to prevent generation of noise in all directions. It is able to reliably capture vibrations and notify them, and can be used as an input signal means for emergency measures such as opening a power circuit or cutting off a gas line when a normal earthquake occurs, as well as as a constant value for equipment. The present invention has been particularly effective as a sensing means for the above-mentioned tilting prevention device, or as a means for predicting theft of movable items such as attaché cases, safes, and automobiles.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a typical embodiment of the present invention, and FIGS. 2 to 8 are sectional views showing other embodiments. In addition, in the figure 1...vibration sensing body, 2... sensing body,
3... Microphone, 4... Sound insulating material, 5... Sensed object, 6... Coil spring, 7... Weight disk, 8... Box.

Claims (1)

[Scope of Claims] 1. A swinging member is fixed to the free end of a spring attached to an object to be vibration sensed, and an inner peripheral wall surface on which a loaded vibration sensing ball rolls is provided on the swinging member. 1. A vibration sensing device comprising: a vibration sensing body having a microphone attached to an outer peripheral wall thereof; 2. The vibration sensing device according to claim 1, wherein the cavity within the container is spherical. 3. The vibration sensing device according to claim 1, wherein the swinging member is a weight disk.