JPH07113815A - Fixing device for vibration sensor - Google Patents

Abstract

PURPOSE:To propose a fixing device for vibration sensor which can fix/separate a vibration sensor easily to a to-be-measured object and select a desired direction to draw out a cable. CONSTITUTION:When a vibration sensor 1 is to be fixed to a to-be-measured object 6, a fixing plate 10 is set which is fixed to a measuring surface 6A of the object 6 and mount the vibration sensor 1 on the surface on the side of the rear, and moreover a holding member 11 is provided to hole the vibration sensor 1 together with the fixing plate 10 thereby to keep the vibration sensor on the fixing plate 10. There is further provided an abutment part 11C in the holding member 11 which abuts against the fixing plate 10 when the vibration sensor 1 is held and secured between the fixing plate 10 and holding member 11 with a predetermined force. Accordingly, a cable 4 drawn out from the vibration sensor 1 can be selected to be in a desired direction, and at the same time, the vibration sensor 1 can be easily attached or detached by this fixing device 9 for vibration sensor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration sensor fixing device, and is particularly suitable for application to a case where a vibration sensor is attached to an object to be measured.

[0002]

2. Description of the Related Art Generally, a vibration sensor such as an acceleration sensor or a speed sensor has an electric signal as an output signal, and is easily used for signal processing and recording, so that it is used in many measurement fields. Conventionally, as this type of vibration sensor, there is a type in which a cable is directly pulled out from the vibration sensor.

In this type of vibration sensor, the other end of the cable pulled out from the vibration sensor main body is connected to an amplifier through a predetermined connecting means, so that the vibration sensor main body and an external signal processing device such as an electric charge or It is designed to be connected to a voltage amplifier (hereinafter referred to as an amplifier).

That is, as shown in FIG. 11, a vibration sensor 1 composed of a piezoelectric acceleration sensor is composed of a plate-shaped base portion 2 having a planar hexagonal shape and a substantially cylindrical case 3 fixed on the base portion 2. Has been done. As a result, in the vibration sensor 1, the vibration converting portion (not shown) provided on the base portion 2 is protected from the external force by the case portion 3.

Further, a cable 4 is drawn out from the side surface portion 2A of the base portion 2 in parallel with the bottom surface of the base portion 2, so that in the vibration sensor 1, the detection signal generated by the vibration conversion portion is passed through the cable 4. Output to an external signal processing circuit.

Heretofore, the vibration sensor 1 has heretofore been directly screwed and coupled to the measurement surface of an object to be measured. Also, for the object to be measured,
When the vibration sensor is attached while being electrically insulated for the purpose of reducing the influence of surrounding electrical noise, for example, as shown in FIG. 11, a plate-shaped fixing member 5 made of an insulating material, for example, a polymer material is used. And fix it to the measurement surface of the object to be measured. That is, screws 5A and 5B are provided on both surfaces of the fixing member 5, and after fixing the fixing member 5 to the vibration target by screwing the screw 5A into the female screw portion formed on the measurement surface of the vibration target, The vibration sensor 1 is fixed to the fixing member 5 by screwing the female screw portion formed on the bottom surface of the vibration sensor 1 into the screw 5B.

As shown in FIG. 12, the cable 4 of the vibration sensor 1 fixed to the object to be vibrated is placed on the measuring surface 6A of the object 6 to be measured, which is separated from the vibration sensor 1 by about 10 to 50 cm. It is fixed using the fixing tool 7. At this time, the cable 4 is fixed between the vibration sensor 1 and the fixture 7 so as to be slightly loosened, so that the occurrence of natural vibration occurring in the cable 4 is prevented and transmitted to the vibration sensor 1 via the cable 4. Unnecessary external vibration is blocked.

[0008]

However, in the vibration sensor 1 of this type, as shown in FIG. 13, when the obstacle 8 is arranged in the vicinity of the measurement point selected based on the measurement plan. However, there is a problem that attachment and detachment of the vibration sensor 1 becomes very complicated and difficult. That is, when the vibration sensor 1 is attached to or removed from the surface to be measured, it is necessary to rotate the entire vibration sensor 1,
At this time, the cable 4 that has been pulled out from the vibration sensor 1 to the outside is blocked by the obstacle 8, which complicates installation work and removal work during maintenance and inspection.

In particular, in maintenance and inspection of production equipment such as rotating machines in factories (hereinafter referred to as equipment diagnosis), it is often necessary to perform simultaneous measurement at many measurement points. When performing such multi-point measurement, many vibration sensors are inevitably required. It is very complicated work to attach and detach the large number of vibration sensors while paying attention to the cables 4 and the obstacles 8.

Even if the vibration sensor 1 can be attached, the obstacle 8 is pulled in the direction in which the cable 4 is pulled out.
Is located, the cable 4 is bent, and as a result, the cable 4 cannot be fixed in an appropriate direction.

As one method for solving such a problem, the bottom surface of the vibration sensor 1 is directly adhered to the measuring surface 6A with an adhesive so that the cable 4 can be moved in a desired direction without rotating the main body of the vibration sensor 1. It is conceivable to fix it. However, in this method, there is a problem that the attachment work becomes complicated due to the necessity of pretreatment for adhesion, and the removal becomes difficult when the vibration sensor 1 is removed for the purpose of maintenance and inspection.

As another method, there is a method of using a vibration sensor 1 of a type provided with a receptacle (hereinafter referred to as a connector type vibration sensor). That is, in the connector type vibration sensor, since the vibration sensor body and the cable are detachably attached via the connector, if the cable is detached from the vibration sensor body when the vibration sensor is attached or detached,
The vibration sensor can be easily attached to the measurement surface.

However, even when the connector type vibration sensor is used, it is necessary to rotate the vibration sensor main body at the time of attachment and detachment, so that the direction of the connector, that is, the direction in which the cable is pulled out, is directed to a desired direction. There is a problem that can not be done.

Further, in the connector type vibration sensor, since the receptacle is required on the vibration sensor main body side and the connector which is attached to and detached from the receptacle is required on the cable side, the number of parts is increased accordingly, and as a result, the direct cable described above is obtained. However, there is a problem in that the vibration sensor 1 is expensive as compared with the vibration sensor 1 of the extracted type. Therefore, there is a problem that it is practically difficult to apply in the field that requires multipoint measurement such as equipment diagnosis.

The present invention has been made in consideration of the above points, and the vibration sensor can be easily fixed and removed from the object to be measured, and the direction in which the cable is pulled out can be selected in a desired direction. It is intended to propose a vibration sensor fixing device that can be used.

[0016]

In order to solve such a problem, according to the present invention, in the vibration sensor fixing device 9 for fixing the vibration sensor 1 to the measurement object 6, the measurement surface 6A of the measurement object 6 is formed on the first surface. The vibration sensor 1 is fixed between the fixing plate 10 on which the vibration sensor 1 is mounted on the second surface, which is fixed to the back surface with respect to the first surface, and the second surface of the fixing plate 10. A holding member 11 for holding the vibration sensor 1 on the fixed plate 10, and a vibration sensor 1 formed on the holding member 11.
Is provided between the fixing plate 10 and the holding member 11 and abutting portions 11B and 11C that come into contact with the second surface of the fixing plate 10 when fixed by a predetermined force.

Further, in the present invention, the fixing plate 10 is formed with two or more screw holes 10A and 10B, and
Through holes 11D and 11E are formed in the holding member 11 at positions facing the screw holes 10A and 10B.
By screwing Nos. 3 and 14 into the screw holes 10A and 10B of the fixing plate 10 through the through holes 11D and 11E of the holding member 11, the vibration sensor 1 is sandwiched and held between the fixing plate 10 and the holding member 11. .

[0018]

When the vibration sensor 1 is fixed to the object 6 to be measured, it is fixed to the measurement surface 6A of the object 6 to be measured on the first surface of the fixing plate 10, and then the second surface on the rear surface side with respect to the first surface is fixed. By mounting the vibration sensor 1 on the surface and providing the holding member 11 for sandwiching and holding the vibration sensor 1 with the fixed plate 10,
The cable 4 pulled out from the vibration sensor 1 can be selected in a desired direction.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) First Embodiment In FIG. 1 in which parts corresponding to those in FIG. 11 are designated by the same reference numerals, 9 indicates a vibration sensor fixing device as a whole, and a fixing plate 10 and a holding member 11 form a piezoelectric element. The vibration sensor 1 composed of a linear acceleration sensor is sandwiched. The fixed plate 10 is formed in a substantially rectangular plane and is made of a metal material. Therefore, in the vibration sensor fixing device 9, the resonance frequency generated between the vibration sensor 1 and the fixed plate 10 can be increased. It is possible to measure vibration in a wide frequency range.

Further, screw through holes 10A and 10B are formed near both ends of the fixed plate 10, and nuts 12A and 12B are buried on the lower surface side of the fixed plate 10, and the nut 12A and the screw are inserted. The through hole 10A, the nut 12B and the screw through hole 10B communicate with each other.

The holding member 11 has a substantially U-shaped cross section, and has an opening 11A at the central position which is slightly larger than the diameter of the case portion 3 of the vibration sensor 1 and slightly smaller than the diameter of the base portion 2. Has been formed. As a result, the holding member 11 can be fitted with the case portion 3 through the opening 11A, and the base portion 2 can be pressed from above by the peripheral portion of the opening 11A.

Abutting portions 11B and 11C are formed at both ends of the holding member 11 and bent in the direction of the fixed plate 10 slightly shorter than the height of the base portion 2 of the vibration sensor 1. Further, near both ends of the holding member 11, screw through holes 11D and 11E facing the screw through holes 10A and 10B of the fixed plate 10 are formed.

Thus, in the vibration sensor fixing device 9, with the vibration sensor 1 placed on the upper surface of the fixing plate 10, the screw 13 is screwed into the nut 12A through the screw holes 11D and 10A, and the screw 14 is screwed into the screw hole. 11
The vibration sensor 1 can be held between the fixed plate 10 and the holding member 11 by screwing it into the nut 12B through E and 10B.

In the above-described structure, the operator first aligns the measuring surface 6A of the measuring object 6 by applying an adhesive to the lower surface of the fixing plate 10, as shown in FIGS. Then, the fixing plate 10 is fixed to the measurement surface 6A.
Next, the operator mounts the vibration sensor 1 on the fixed plate 10 so that the direction of the cable 4 pulled out from the vibration sensor 1 faces the desired direction.

In this state, the holding member 11 is fixed by fitting the opening 11A of the holding member 11 into the case portion 3 of the vibration sensor 1 and screwing the screws 13 and 14 into the nuts 12A and 12B of the fixing plate 10, respectively. Attach to plate 10.

At this time, the operator uses a driver (not shown) to screw in the screws 13 and 14 until the contact portions 11B and 11C of the holding member 11 come into contact with the fixed plate 10. At that time, since the lengths of the contact portions 11B and 11C are determined, the operator can fix the contact portions 11B and 11C at the fixing plate 1
It is possible to determine whether or not a proper pressing force is being applied to the vibration sensor 1 based on whether or not it abuts against 0, and as a result, the vibration sensor 1 is fixed to the fixing plate 10 with a proper pressing force.
Can be fixed to.

As a result, the holding member 11 presses against the upper surface of the base portion 2 with a strong pressing force, so that the vibration sensor 1 is securely held on the fixed plate 10. At this time, the contact portions 11B and 11C formed on the holding member 11 are fixed to the fixing plate 10.
By abutting against, the vibration sensor 1 can be pressed against the fixed plate 10 with a uniform force. Thus, in the vibration sensor fixing device 9, the vibration sensor 1 can be fixed to the measurement target 6 without rotating, and
The direction of the cable 4 can be selected and fixed in a desired direction.

According to the above construction, since the vibration sensor 1 is sandwiched between the fixed plate 10 and the holding member 11, the cable 4 drawn out from the vibration sensor 1 can be directed in a desired direction. It is possible to realize the vibration sensor fixing device 9 in which the vibration sensor 1 can be easily attached to and detached from the measurement target 6.

Further, since the vibration sensor 1 is indirectly attached to the measuring object 6 via the fixed plate 10, the measuring surface 6A of the measuring object 6 is machined to be flat or screw holes are machined. Since it is not necessary to apply it, the vibration sensor 1 can be easily fixed to a desired measurement target.

(2) Second Embodiment In FIG. 4 in which parts corresponding to those in FIG. 2 are designated by the same reference numerals, reference numeral 15 denotes a vibration sensor fixing device as a whole, and the vibration sensor fixing device 9 is made of a metal material. The vibration sensor fixing device 9 has the same structure as the vibration sensor fixing device 9 except that the fixing plate 10 is changed to a fixing plate 16 made of a polymer material.

That is, in the vibration sensor 15, the polymer material is selected as the material of the fixed plate 16,
The vibration sensor 1 can be electrically insulated from the measurement target 6, and the influence of electrical noise from the measurement target 6 can be reduced. As a result, the vibration sensor fixing device 15 can measure the vibration of the measuring object 6 with high accuracy.

If a plate-shaped holding member 18 as shown in FIG. 5 is used in place of the holding member 11 having the contact portions 11B and 11C, the holding member 18 and the fixed plate 1 will be described.
6 is warped inward by the pulling force of the screws 13 and 14. As a result, since the fixing plate 16 is made of a polymer material, when it is installed for a long period of time, this warp increases, and accordingly, the bottom surface of the fixing plate 16 contacts the measurement surface 6A of the measuring object 6. The area is reduced.

Eventually, the spring constant between the fixed plate 15 and the measurement surface 6A of the measurement object 6 (determined by the contact area,
When the contact area decreases, the spring constant also decreases), and the contact resonance frequency determined by the sum of the masses of the fixed plate 16 and the holding member 18 and the mass of the acceleration sensor becomes low. The problem of narrowing occurs.

In order to do so, the vibration sensor fixing device 15
When the holding member 11 having the contact portions 11B and 11C at both ends is provided and the holding member 11 is attached to the fixed plate 16 via the vibration sensor 1, the contact portions 11B and 11C are provided.
By contacting the peripheral edge of the fixed plate 16, the fixed plate 14 can be effectively prevented from warping, and as a result, the measurement accuracy of the vibration sensor 1 can be maintained with high accuracy.

Further, in the vibration sensor fixing device 15,
Since the fixing plate 16 is formed of a polymer material, even if the measurement object 19 is in a curved state as shown in FIG. 6, for example, the fixing plate 16 that abuts the measurement surface 19A along the curved state. It can be easily molded, and as a result, the measurement accuracy of the vibration sensor 1 can be improved.

According to the above construction, the vibration plate 1 is made of the polymeric material, and the holding member 11 is provided with the contact portions 11B and 11C which come into contact with the peripheral edge of the fixed plate 16. The vibration that allows the cable 4 drawn out from the device to be oriented in a desired direction and that the vibration sensor 1 can be easily attached to and detached from the measurement target 6 and that the vibration of the measurement target 6 can be measured with high accuracy. The sensor fixing device 15 can be realized.

(3) Other Embodiments In the above-described embodiment, when the vibration sensor fixing devices 9 and 15 are attached to the measuring object 6, the fixing plates 10 and 16 and the measuring object 6 are bonded to each other. Although the case where the fixing is performed by using the agent has been described, the present invention is not limited to this, and as shown in FIG. 7, a predetermined screw hole 6C is formed in the measurement surface 6A of the measurement object 6 and the fixing plate 10 is fixed. By drilling the same screw hole 10A as the screw hole 6C on the lower side surface, the fixing plate 10 is fixed to the measurement object 6 by screwing between the screw hole 6C and the screw hole 10A with a screw 21. You can In this case, the fixing plate 10 can be detachably fixed, and the fixing plate 15 can be stably fixed to the measuring object 6 for a long time, and the vibration of the measuring object 6 can be measured with higher accuracy.

In the above embodiment, the present invention is
The case where the piezoelectric acceleration sensor 1 is fixed has been described, but the present invention is not limited to this. For example, an electrodynamic speed sensor,
It can also be applied when fixing various vibration sensors such as a strain gauge type displacement sensor.

In particular, when the vibration sensor fixing device according to the present invention is used for a strain gauge type displacement sensor having a weak internal structure, the strain gauge type displacement sensor can be easily removed, so that the conventional fixing method is used. It is possible to effectively prevent breakage of the vibration sensor at the time of adhesion fixation and removal, which occurs in the above.

In the above embodiment, the vibration sensor fixing device 9 having the holding member 11 having a substantially U-shaped cross section and the fixing plate 10 having a substantially rectangular plane is described, but the present invention is not limited to this. For example, as shown in FIG. 8, even when a vibration sensor fixing device 24 including a fixing plate 22 having a circular plane and a holding member 23 having a substantially circular outer shape is used, the same effect as that of the above-described embodiment is obtained. be able to.

In this case, the fixing plate 22 has three female screws 22.
A, 22B and 22C are formed and the holding member 23 is formed.
Of these, screw-through holes 23A, 23B and 23C are formed at positions facing female screws 22A, 22B and 22C, respectively, and screws 25, 26 and 27 are passed through the screw-through holes 23A, 23B and 23C, respectively.
By screwing into B and 22C, the vibration sensor 1 can be securely held on the fixed plate 22 as in the case of the above-described embodiment.

Further, as the holding member, various shapes can be applied, and as a method for attaching the holding member to the fixing plate, various methods other than screwing, for example, a method of fixing using a snap fit is applied. be able to.

In the above embodiment, the vibration sensor 1 in which the cable 4 is pulled out from the side surface portion 2A of the base portion 2 is used as the vibration sensor to be fixed, but the present invention is not limited to this. Not limited to this, instead of the holding member 11, as shown in FIG. 9, a cylindrical portion 30 is provided and an opening 30 </ b> A for pulling out a cable is provided on the upper surface of the cylindrical portion 30.
If the holding member 31 having the ridge is used, it can be applied to the vibration sensor 34 in which the cable 33 is pulled out from the top 32A of the case 32 as shown in FIG.

In this case, the holding member 31 is the vibration sensor 34.
By holding the entire vibration sensor 34 by abutting against the case portion 32, various vibration sensors can be held regardless of the shape of the base portion 35 of the vibration sensor 34, and furthermore, the vibration without the base portion 35 can be held. It can also be applied to a sensor.

In the above-mentioned embodiment, the present invention is
The case where the cable 4 is applied to the vibration sensor 1 which is directly pulled out from the vibration sensor 1 has been described, but the present invention is not limited to this and can be applied to a connector type vibration sensor in which the cable is detachable.

Further, in the above-described second embodiment, the case where the fixing plate 16 is made of a polymer material has been described, but the present invention is not limited to this, and the material of the fixing plate is as follows.
Other insulating members that can insulate the measurement target 6 and the piezoelectric acceleration sensor 1 from each other, such as an aluminum plate whose surface is anodized, may be used.

[0048]

As described above, according to the present invention, when the vibration sensor is fixed to the measurement object, the vibration sensor is fixed to the measurement surface of the measurement object on the first surface and the back surface with respect to the first surface. Formed on the holding plate, a fixing plate for mounting the vibration sensor on the second surface on the side, a holding member for sandwiching the vibration sensor between the second surface of the fixing plate, and holding the vibration sensor on the fixing plate. ,
A cable pulled out from the vibration sensor is desired by providing a contact portion that comes into contact with the second surface of the fixing plate when the vibration sensor is sandwiched between the fixing plate and the holding member and fixed with a predetermined force. It is possible to realize a vibration sensor fixing device that can be selected in the direction of and that can easily fix and remove the vibration sensor.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of an embodiment of a vibration sensor fixing device according to the present invention.

FIG. 2 is a partial sectional view showing an embodiment of the vibration sensor fixing device according to the present invention.

FIG. 3 is a side view showing an embodiment of a vibration sensor fixing device according to the present invention.

FIG. 4 is a partial sectional view showing a vibration sensor fixing device according to a second embodiment.

FIG. 5 is a partial cross-sectional view for explaining the vibration sensor fixing device when there is no contact portion.

FIG. 6 is a partial cross-sectional view showing a vibration sensor fixing device according to a second embodiment.

FIG. 7 is a partial cross-sectional view showing a vibration sensor fixing device according to another embodiment.

FIG. 8 is a perspective view showing an overall configuration of a vibration sensor fixing device according to another embodiment.

FIG. 9 is a perspective view showing a holding member according to another embodiment.

FIG. 10 is a partial cross-sectional view showing a vibration sensor fixing device according to another embodiment.

FIG. 11 is a perspective view showing a conventional vibration sensor fixing device.

FIG. 12 is a side view showing a fixed state of the cable.

FIG. 13 is a plan view showing a blocked state of the cable.

[Explanation of symbols]

1 ... Piezoelectric acceleration sensor, 2 ... Base part, 3 ... Case part, 4 ... Cable, 6 ... Measurement object, 9 ... Vibration sensor fixing device, 10 ... Fixing plate, 11 ... Holding Member, 12A, 12B ... Nut, 13, 14 ... Screw.

Claims (2)

[Claims] 1. A vibration sensor fixing device for fixing a vibration sensor to a measurement object, comprising: a first surface fixed to a measurement surface of the measurement object; A holding member that holds the vibration sensor on the fixed plate by sandwiching the vibration sensor between a fixed plate on which the vibration sensor is placed and a second surface of the fixed plate, and a holding member formed on the holding member. A vibration sensor, comprising: a contact portion that abuts against the second surface of the fixed plate when the vibration sensor is sandwiched between the fixed plate and the holding member and fixed with a predetermined force. Fixing device. 2. The fixing plate is formed with two or more screw holes, and a through hole is formed at a position of the holding member facing the screw hole, and a predetermined screw member is attached to the holding member. The vibration sensor fixing device according to claim 1, wherein the vibration sensor is sandwiched and held between the fixing plate and the holding member by being screwed into the screw hole of the fixing plate through a through hole.