JPH0979897A - Mechanical filter for acceleration pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate handling when an acceleration pickup is fitted to or removed from a mechanical filter. SOLUTION: A fitting seat 2 screwing and fixing an acceleration pickup and a pedestal 3 fitted to a measured object are integrally formed via elastic members 4, 5 in this mechanical filter for the acceleration pickup. The elastic connection between the fitting seat 2 and the pedestal 3 is held by the elastic members 4, 5, and the fitting seat 2 and the pedestal 3 are blocked from being rotated against each other by a rotation blocking means. The rotation blocking means is constituted of holes 2b, 3c, 4a formed in the axial direction at drifted positions from the axes of the fitting seat 2 and the pedestal 3 and pins 6 inserted into the holes 2b, 3c, 4a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical filter for an acceleration pickup, which mechanically prevents the acceleration pickup from detecting a high frequency vibration.

[0002]

2. Description of the Related Art Generally, in vibration measurement that does not require high-frequency vibration components of an object to be measured, a mechanical filter is arranged between the object to be measured and an acceleration pickup so that the acceleration pickup detects high-frequency vibration. Is mechanically blocked to detect only low-frequency vibration components.

As shown in FIG. 4, as a conventional mechanical filter 100 for an acceleration pickup, a metallic mounting base 102 for fixing the acceleration pickup 101, a metallic pedestal 104 for mounting on an object 103 to be measured, and mounting Elastic member 10 filled between the seat 102 and the pedestal 104
It is composed of 5. Then, a male screw 106 for screwing and fixing the acceleration pickup 101 to the upper surface of the mounting seat 102 and a mechanical filter 10 to the lower surface of the pedestal 104.
Female screw 107 for screwing and fixing 0 to the DUT 103
Are formed. Further, the elastic member 105 is provided, for example, by filling silicon rubber between the mounting seat 102 and the pedestal 104, or by attaching a butyl rubber plate material molded in a predetermined shape to the mounting seat 102 and the pedestal 104 with an adhesive. There is.

By the way, when the acceleration pickup 101 is screwed to the mechanical filter 100, the mounting seat 10
Tightening torque is applied to 2 and the elastic member 105 peels off from the mounting seat 102 due to the tightening torque. Therefore, in order to solve this problem, the pedestal 104 and the elastic member 105 are penetrated through the side surface of the pedestal 104, and
A hole 108 up to 02 is drilled. When the acceleration pickup 101 is attached to the mechanical filter 100, the rod 109 reaching the attachment seat 102 is provided with the hole 108.
The elastic member 105 is prevented from peeling off from the mounting seat 102 by being fitted into the mounting seat 102 so that the mounting seat 102 does not rotate with respect to the pedestal 104. When measuring acceleration, the mounting seat 102 is elastically coupled to the pedestal 104 via the elastic member 105 by removing the rod 109 from the hole 108.

[0005]

In the prior art, the rod must be inserted into the hole when the accelerometer is attached to and removed from the mechanical filter, while the rod must be removed from the hole when measuring the acceleration. There is a problem that handling becomes complicated because it does not occur. Further, if such handling is neglected, there are problems that the elastic member is peeled off and desired measurement data cannot be obtained.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide an acceleration pickup which is easy to handle when attaching or detaching the acceleration pickup to / from a mechanical filter. It is intended to provide a mechanical filter.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is for an acceleration pickup in which a mounting seat for screwing and fixing the acceleration pickup and a pedestal for mounting on an object to be measured are integrally formed via an elastic member. In the mechanical filter, the mounting seat and the pedestal are provided with a rotation preventing means for preventing the mounting seat and the pedestal from rotating relative to each other while maintaining the elastic coupling by the elastic member.

Further, it is preferable that the rotation preventing means comprises a hole formed in the axial direction at a position eccentric from the axial center of the mounting seat and the pedestal, and a pin inserted into these holes.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a top view of a mechanical filter for an acceleration pickup according to the present invention, FIG. 2 is a sectional view of the same, and FIG. 3 is an exploded view showing a mounting state of the same.

As shown in FIGS. 1 and 2, a mechanical filter 1 for an acceleration pickup has a mounting seat 2 and a base 3 made of a metal material, and two circles arranged between the mounting seat 2 and the base 3. The plate-shaped rubber plates 4 and 4 and the ring-shaped rubber plate 5,
Consists of two metal pins 6 and 6 fixed to the pedestal 3, tubes 7 and 7 that cover these pins 6 and 6, and a holding plate 8 that holds the ring-shaped rubber plate 5 against the mounting base 2. Has been done.

The mounting seat 2 is formed in a disk shape having a step portion at the peripheral edge, and a male screw 2a is formed at the center of one end surface. The pedestal 3 is formed in a flat hexagonal prism shape, has a male screw 3a formed at the center of one end surface, and a recess 3b formed at the other end surface.

The male screw 2a formed on the mounting seat 2 is shown in FIG.
As shown in FIG. 2, the acceleration pickup 10 is fixed by screwing, and the male screw 3a formed on the pedestal 3 is
This is for screwing and fixing the mechanical filter 1 to the female screw 11 a formed on the surface of the DUT 11. The axis of the male screw 2a, which is the axis of the mounting seat 2, and the axis of the male screw 3a, which is the axis of the pedestal 3, are aligned.

Two holes 3c, 3c are formed symmetrically in the pedestal 3 in the axial center direction of the male screw 3a at a position eccentric from the axial center of the male screw 3a, and one end thereof is press-fitted into these holes 3c, 3c. The pins 6 and 6 are fixed by. Further, the other ends of the pins 6 and 6 project toward the recess 3b. The pins 6 and 6 are covered with tubes 7 and 7 formed of an insulating material such as synthetic resin. Further, the two disc-shaped rubber plates 4, 4 and the mounting seat 2 have holes 4a, 2b having a diameter larger than the diameter of the tube 7 into which the pins 6, 6 covering the tubes 7, 7 are loosely inserted. Are drilled in the axial direction of the male screw 3a.

In order to assemble the mechanical filter 1 for the acceleration pickup, first, the pins 6 and 6 are fixed by press-fitting into the holes 3c and 3c of the pedestal 3, and the pins 6 and 6 are inserted into the holes 4a and 4a of the rubber plates 4 and 4, respectively. And the two rubber plates 4 and 4 are laid in the recess 3b of the pedestal 3 in a stacked manner. Next, the pins 6 and 6 are inserted into the holes 2b and 2b of the mounting seat 2 and the rubber plate 4 and
The mounting seat 2 is arranged so as to be stacked on top of 4. Further, a ring-shaped rubber plate 5 is laminated on the step portion at the peripheral edge of the mounting seat 2. Finally, in order to press the two rubber plates 4 and 4 and the ring-shaped rubber plate 5, the pressing plate 8 is adhered and fixed to the inner peripheral surface of the recess 3b with the epoxy adhesive 9. Then, the pins 6 and 6 are the holes 3 of the pedestal 3.
c, 3c, the holes 4a, 4 of the rubber plates 4, 4 are fixed.
a and the holes 2b, 2b of the mounting seat 2 are loosely inserted.

The operation of the mechanical filter 1 for an acceleration pickup configured as above will be described. When mounting the acceleration pickup 10 on the mechanical filter 1, as shown in FIG. 3, first, the male screw 3a of the mechanical filter 1 is screwed onto the female screw 11a formed on the surface of the DUT 11 to measure the mechanical filter 1. Thing 11
Fixed to. The acceleration pickup 10 may be attached to the mechanical filter 1 and then fixed to the DUT 11.

Next, in order to mount the acceleration pickup 10 on the mechanical filter 1, the male screw 2a of the mounting seat 2 is attached.
A female screw (not shown) of the acceleration pickup 10 is screwed onto the. Then, the mounting seat 2 receives a tightening torque that tends to rotate with respect to the base 3. However, the holes 2b, 2 of the mounting seat 2
Since the inner peripheral surface of b abuts on the pins 6 and 6 covering the tube 7, the mounting seat 2 does not rotate with respect to the pedestal 3.

Therefore, when the acceleration pickup 10 is screwed and fixed to the mechanical filter 1, the mounting seat 2, the two rubber plates 4 and 4 and the pedestal 3 are handled by the pins 6 and 6 as a substantially integrated body. Therefore, the mounting seat 2 does not rotate with respect to the base 3, and the two rubber plates 4 and 4 are not damaged. Then, when the mounting work is completed and the tightening torque is no longer applied to the mounting seat 2, the pins 6 and 6 covering the tube 7
Is separated from the inner peripheral surfaces of the holes 2b, 2b of the mounting seat 2 by the elastic force of the rubber plates 4, 4 and the tubes 7, 7.

When measuring the acceleration, the mounting seat 2 is supported by the pedestal 3 only through the rubber plates 4 and 4, so that the pins 6 and 6 are supported.
The presence of 6 has no influence on the original function of the mechanical filter 1 with respect to the acceleration of the male screws 2a and 3a in the axial direction, that is, mechanically preventing the acceleration pickup 10 from detecting high-frequency vibrations.

Further, the mechanical filter 1 according to the present invention
In the above, the assembling process is simplified as compared with the conventional mechanical filter 100. Conventional mechanical filter 10
At 0, the elastic member is formed by filling silicon rubber or adhering the molded product, which complicates the assembling work. That is, when silicone rubber is filled, processing work such as defoaming is required, and when a rubber plate of a molded product is used, bonding work is required. However, in the mechanical filter 1 according to the present invention, the assembly work is simplified because the elastic member is formed only by laminating the rubber plates 4 and 5. Furthermore, the holding plate 8
If an adhesive having a short curing time is used as the adhesive for fixing the to the inner peripheral surface of the pedestal 3, the assembly time can be shortened as compared with the conventional mechanical filter 100.

The tube 7 is provided to maintain the electrical insulation between the mounting seat 2 and the pedestal 3. At the time of acceleration measurement when the tightening torque is removed, the metal pin 6 fixed to the pedestal 3 is formed in the mounting seat 2 in the hole 2b.
This is because the electrical insulation between the mounting seat 2 and the pedestal 3 may be impaired by contact with the inner peripheral surface of the. If the electrical insulation between the mounting seat 2 and the pedestal 3 is impaired, ground loop noise through the DUT 11 is superimposed on the output voltage of the acceleration pickup 10 and the measurement accuracy deteriorates, which is not preferable. However, when the pin 6 is formed of an insulating material, it is not necessary to cover the tube 7 with the tube 7, and the tube 7 is not necessarily used in the measurement in which electrical insulation between the mounting seat 2 and the pedestal 3 is not required. It is not necessary to cover the pin 6.

Further, as the elastic member, one rubber plate having a thickness corresponding to the thickness of the two rubber plates 4 and 4 may be used instead of the two rubber plates 4 and 4. Furthermore, 1
Apply adhesive to both sides of one rubber plate, and mount 2 and pedestal 3
May be adhered to. In this case, the ring-shaped rubber plate 5 and the pressing plate 8 can be omitted, and the shape of the mounting seat 2 can be simplified.

The pin 6 may be fixed to the pedestal 3 so as to be loosely inserted into the hole 4a of the rubber plate 4 and the hole 2b of the mounting seat 2, or fixed to the mounting seat 2 and the rubber plate. 4 may be loosely inserted into the hole 4a and the hole 3c of the pedestal 3. The number of pins 6 may be one or may be two or more.

[0023]

As described above, according to the present invention, handling of attaching and detaching the acceleration pickup to and from the mechanical filter is facilitated and the usability is remarkably improved.

[Brief description of drawings]

FIG. 1 is a top view of a mechanical filter for an acceleration pickup according to the present invention.

FIG. 2 is a sectional view of a mechanical filter for an acceleration pickup according to the present invention.

FIG. 3 is an exploded view showing a mounting state of a mechanical filter for an acceleration pickup according to the present invention.

FIG. 4 is an exploded sectional view showing a mounting state of a conventional mechanical filter for an acceleration pickup.

[Explanation of symbols]

1 ... Mechanical filter for accelerometer, 2 ... Mounting seat, 2a, 3a ... Male screw, 2b, 3c, 4a ... Hole, 3
… Pedestals, 4,5… rubber plates, 6… pins, 7… tubes, 8
... Presser plate, 10 ... Accelerometer, 11 ... Object to be measured.

Claims (2)

[Claims] 1. A mechanical filter for an acceleration pickup, wherein a mounting seat for screwing and fixing an acceleration pickup and a pedestal for mounting on an object to be measured are integrally formed through an elastic member, wherein the mounting seat and the pedestal are the elastic members. A mechanical filter for an acceleration pickup, comprising: a rotation preventing means for preventing the mounting seat and the pedestal from rotating relative to each other while maintaining the elastic coupling by the. 2. The rotation preventing means comprises holes formed in the axial direction at positions eccentric from the axial centers of the mounting seat and the pedestal, and pins inserted through these holes.
Mechanical filter for the acceleration pickup described.