JPH0351720Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a simple vibration detection device that can easily detect the degree of vibration occurring in a structure, the ground, etc. by simply leaving it as it is.

BACKGROUND OF THE INVENTION Conventional vibration detection devices require a power source, a starter to detect vibrations that occur intermittently over a long period of time, and are of a recording type.

Problems to be Solved by the Invention The conventional vibration detection device described above requires a power source, a starter, etc., and therefore has no choice but to become a large-scale device. Further, in the case of the recording type, there is a drawback that management such as replacing the recording paper and replenishing the ink is required.

Therefore, an object of the present invention is to provide a vibration detection device that can solve the above problems.

Means for Solving the Problem In order to solve the above problem, the vibration detection device of the present invention includes a base that can be placed on a vibrating object, an elastic member fixed to the base, and a It consists of an upright tapered elastic rod-like body, a falling body fitted onto the elastic rod-like body so as to be slidable in the vertical direction, and a scale plate for detecting the amount of vertical movement of the falling body. , and the falling body includes an annular body having an annular groove on the inner periphery, and a plurality of hair-like bodies are implanted on the inner surface of the annular body, the annular body being slidably inserted in the annular groove in the radial direction. It is composed of a pair of half-split semicircles and an adjustment screw for adjusting the position of these semicircles in the radial direction.

Operation After placing the vibration detection device on the vibrating object, the elastic rod-shaped body is fitted onto the falling object. When vibration occurs in this state, the vibration is transmitted to the elastic rod-like body through the elastic member, the elastic rod-like body vibrates like a metronome, and an inertial force in the vertical direction is generated on the falling object.
Therefore, when this inertia force becomes larger than the static friction force, the falling object starts moving downward. and,
Since the elastic rod-like body is slightly tapered, the cross-sectional area of the lower part is larger than the cross-sectional area of the upper part. The falling object comes to rest at the position where the frictional force is greater. Thereby, the maximum amount of vibration can be easily detected.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 4. 1 is a vibration detection device, and a vibrating object 2
A base 3 that can be placed on top, an elastic rubber body (elastic member) 4 fixed to the center of the base 3, and a rigid mounting member 5 erected on the elastic rubber body 4. An elastic rod-like body 6 having a circular cross-section and tapered shape, a falling body 7 fitted onto the elastic rod-like body 6 so as to be slidable in the vertical direction, and the amount of sliding of this falling body 7, that is, the amount of movement in the vertical direction. and a scale plate 9 for detecting this via a pointer 8 protruding from the falling body 7. Further, as shown in FIGS. 3 and 4, the falling body 7 includes a metal annular body 11 having an annular groove 10 on the inner periphery, and a metal annular body 11 having an annular groove 10 in the annular body 11 in the radial direction. A pair of left and right half-split halves that are slidably inserted and have a large number of hair-like bodies (such as brush hairs) 12 implanted on the inner surface so as to face the center of the elastic rod-like body 6. Circle 1
3A, 13B, and adjusting screws (bolts) 14 which are threadedly inserted into a plurality of suitable positions around the annular body 11 to adjust the position of each semicircular body 13A, 13B in the radial direction.

Next, the effect will be explained.

First, vibrations (e.g. earthquakes, vibrations caused by machinery, etc.)
Vibration detection device 1 is placed on the top surface of vibrating object 2 that you want to detect.
After placing the falling body 7 on the elastic rod-shaped body 6. At this time, the pointer 8 of the falling object 7 is exactly on the scale plate 9.
Adjust the semicircular bodies 13A and 13B by sliding them using the adjusting screw 14 so that the semicircular bodies 13A and 13B are at the 0 position. When vibration occurs in this state, the vibration is transmitted to the elastic rod-shaped body 6 via the elastic rubber body 4, and the elastic rod-shaped body 6 vibrates in the direction of arrow A like a metronome. When there is no vibration, the falling body 7 fitted onto the top of the elastic rod-like body 6 remains stationary due to the balance between the weight of the falling body 7 and the static friction between the hair-like body 12 and the elastic rod-like body 6. However, since the elastic rod-shaped body 6 vibrates when vibration occurs, a vertical inertia force is generated on the falling object 7. Therefore, when this inertial force becomes larger than the static friction force, the falling object 7 moves downward. Start. Since the elastic rod-like body 6 is slightly tapered, the lower cross-sectional area is larger than the upper cross-sectional area, and depending on the amount of vibration, the inertia force in the vertical direction is applied to the hair-like body 12 and the elastic rod-like body 6. There is a position where the frictional force between the two is no longer exceeded and the object stops. Therefore, the scale indicated by the pointer 8 at this time represents the maximum amount of vibration. In this way, when a vibration of a certain magnitude occurs in this device, the pointer moves in response to the vibration, but no matter how many times the same vibration or smaller vibration is repeated, the pointer does not move. However, if more vibration occurs, the pointer moves again, so the maximum amount of vibration from when it was installed can always be detected. In addition, when using this device as a seismic intensity scale detector based on earthquake motion, this device should be installed in advance on a vibration excitation table that can reproduce actual earthquake motion, and when the device is excited at the magnitude of an earthquake according to a representative earthquake waveform. The amount of movement of the device scale is recorded for each earthquake strength, and a scale is used that has been verified by adding graduations. When used as a detector for random vibrations such as seismic motion or ground vibration, a scale is used that has been verified in advance using a vibration waveform with a response spectrum generated at the installation location. In addition, this device can be used as a simple device for determining the magnitude of vibration when plant structures, buildings, bridges, etc. vibrate due to earthquake motion. In addition, this device is used not only as a simple vibration meter to read the magnitude of vibrations, but also as a sensor for a shutdown system to stop equipment or stop gas supply in the event of an emergency such as an earthquake. You can also do that.

Effects of the Invention According to the above-mentioned configuration of the present invention, an elastic rod-like body is erected on an elastic member, and a falling body whose movement amount varies depending on the magnitude of vibration is fitted around the elastic rod-like body, so that the vibrating object can be Since the maximum amount of vibration is detected, unlike conventional devices, there is no need for a power source, there is no need to replenish recording paper, ink, etc., and the device is more compact and easy to handle.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall sectional view, FIG. 2 is a view taken along the - arrow in FIG. 1, and FIG.
Figure 3 is a cross-sectional view of the moving body, and Figure 4 is the − of Figure 3.
It is an arrow view. 1... Vibration detection device, 2... Vibrating object, 3...
Base, 4... Elastic rubber body (elastic member), 6... Elastic rod-shaped body, 7... Falling body, 8... Pointer, 9... Scale plate, 10... Annular groove, 11... Annular body, 12...
...hairy body, 13A, 13B...semicircle, 14...
Adjustment screw.

Claims (1)

[Scope of utility model registration request] A base that can be placed on a vibrating object, an elastic member fixed to the base, a tapered elastic rod-shaped body erected on the elastic member, and a base that can slide vertically on the elastic rod-shaped body. Consisting of a falling object that can be fitted onto the outside, and a scale plate that detects the amount of vertical movement of the falling object,
The falling body includes a pair of annular bodies having an annular groove on the inner periphery, and a pair of annular bodies that are slidably inserted in the annular groove in the radial direction, and a number of hair-like bodies are implanted on the inner surface of the annular body. 1. A vibration detection device comprising: a half-split semicircular body; and an adjustment screw for adjusting the position of the semicircular body in the radial direction.