Vibration measurement auxiliary device and vibration measurement method

Abstract

This device provides a vibration measurement support system that enables highly versatile vibration measurement, while maintaining a simple configuration. [Solution] The vibration measurement assist device assists in measuring the vibration of an object using a vibration sensor. The vibration measurement assist device comprises a holding member that detachably holds the vibration sensor, and a magnet that detachably fixes the holding member to the object. The holding member has a plate-shaped member and a pair of protrusions that protrude in the thickness direction of the plate-shaped member. The magnet is provided on the protrusions.

Description

Technical Field

[0001] The present invention relates to a vibration measurement assistance device and a vibration measurement method using the same.

Background Art

[0002] Conventionally, in various systems (for example, power generation facilities, production facilities), by periodically measuring the mechanical vibration of an object (for example, a motor, a pump, a cylinder, a pipe), it is diagnosed whether the system is operating normally.

[0003] And, for example, in Patent Documents 1 and 2, vibration measurement devices for measuring the mechanical vibration of an object are disclosed. The vibration measurement device described in Patent Document 1 includes a sensor unit, a case that houses the sensor unit, and a magnet that fixes the case to the object. The vibration measurement device described in Patent Document 2 includes three vibration detection ends that each detect the vibration of the object, a detection end holding means that holds the three vibration detection ends, and a detaching means that attaches and detaches the detection end holding means to and from the object.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the vibration measurement devices of Patent Documents 1 and 2 have a first problem that the structure is very complex. Further, since the sensor and the case are integrated in the vibration measurement devices of Patent Documents 1 and 2, there is a second problem that the versatility of vibration measurement is lacking.

[0006] The present invention was made to solve the aforementioned problems, and its objective is to provide a technology that enables a highly versatile vibration measurement auxiliary device with a simple configuration. [Means for solving the problem]

[0007] To solve the above problems, the present invention provides a vibration measurement assist device for assisting the measurement of vibration of an object using a vibration sensor, comprising a holding member for detachably holding the vibration sensor and a magnet for detachably fixing the holding member to the object, wherein the holding member has a plate-shaped member and a pair of protrusions protruding in the thickness direction of the plate-shaped member, and the magnet is provided on the protrusions. [Effects of the Invention]

[0008] According to the present invention, a vibration measurement auxiliary device that enables highly versatile vibration measurement can be realized with a simple configuration. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view of a vibration measurement support device. [Figure 2] This is a flowchart of the vibration measurement method. [Figure 3] This figure shows the state in which vibrations in the X direction are being measured. [Figure 4] This is an exploded perspective view of the two vibration measurement auxiliary devices before they are assembled. [Figure 5] This is a perspective view showing two vibration measurement support devices combined. [Figure 6] This figure shows the state of measuring vibration in the Y direction. [Figure 7] This figure shows the state in which vibrations in the Z direction are being measured. [Figure 8] This figure shows the results of a test to verify the performance of a vibration measurement support device. [Modes for carrying out the invention]

[0010] The vibration measurement assist devices 10A and 10B according to the embodiments will be described below with reference to the drawings. The embodiments of the present invention described below are merely examples of how the present invention can be implemented, and do not limit the scope of the present invention to the scope described in the embodiments. Therefore, the present invention can be implemented by making various modifications to the embodiments.

[0011] As shown in Figures 3, 6, and 7, the vibration measurement assist devices 10A and 10B are devices (jigs) that assist the vibration measurement of an object 5 by the vibration sensor 1. More specifically, the vibration measurement assist devices 10A and 10B are devices that assist the vibration measurement by the vibration sensor 1 by interposing them between the vibration sensor 1 and the object 5 and transmitting the vibration of the object 5 to the vibration sensor 1. As a preferred application, by combining two vibration measurement assist devices 10A and 10B of the same shape, the vibration of the object 5 in the X, Y, and Z directions can be measured by the vibration sensor 1. However, the vibration measurement assist devices 10A and 10B may also be used individually.

[0012] The vibration sensor 1 can be a well-known sensor capable of measuring the amplitude and frequency of vibrations of the object 5. The probe 2 of the vibration sensor 1 generally has a cylindrical shape. The tip surface of the probe 2 is a plane that serves as the measuring surface for measuring the vibrations of the object 5. The vibration sensor 1 measures vibrations in a direction perpendicular to the measuring surface. Furthermore, the probe 2 has a built-in magnet (permanent magnet) so that it can be detachably fixed to a magnetic material. However, the specific shape and function of the vibration sensor 1 are not limited to the examples described above.

[0013] Object 5 includes any object that generates vibration. Object 5 is, for example, an object (e.g., motor, pump, cylinder, piping) that constitutes a system (e.g., power generation equipment, production equipment). Also, as shown in Figures 3, 6, and 7, Object 5 has, for example, a generally cylindrical shape. That is, the surface of Object 5 is curved. Note that the surface of Object 5 is not limited to a smooth curved surface; the virtual surface connecting the tips of multiple radially extending fins may also be a curved surface (cylindrical surface). However, the specific shape and function of Object 5 are not limited to the examples described above.

[0014] Hereinafter, the three mutually orthogonal directions are defined as the X direction (first direction), the Y direction (second direction), and the Z direction (third direction). The X, Y, and Z directions do not refer to absolute directions (i.e., up and down, front and back, left and right directions), but rather to relative relationships. Furthermore, in Figures 3 to 7, the directions are illustrated with the vibration measurement auxiliary device 10A as the reference point, and the positional relationships of each part are explained assuming that the axial direction of the cylindrical object 5 coincides with the "Z direction".

[0015] Figure 1 is a perspective view of the vibration measurement auxiliary device 10A. Since the vibration measurement auxiliary devices 10A and 10B have the same shape, the vibration measurement auxiliary device 10A will be described below. In addition, the same reference numbers will be assigned to the same components of the vibration measurement auxiliary devices 10A and 10B, and they will be distinguished by the "A" and "B" at the end. As shown in Figure 1, the vibration measurement auxiliary device 10A comprises a holding member 11A and a pair of magnets 12A and 13A.

[0016] The holding member 11A detachably holds the probe 2 of the vibration sensor 1. The holding member 11A mainly includes a main wall (plate-like member) 14A, a pair of protruding walls (protrusions) 15A and 16A, and a protruding piece 17A. Further, the holding member 11A is integrally formed of, for example, a magnetic material (e.g., SU430) that detachably fixes a magnet. Furthermore, the main wall 14A, the protruding walls 15A and 16A, and the protruding piece 17A are formed, for example, by cutting a mass of magnetic material. However, the material and manufacturing method of the holding member 11A are not limited to the above examples. As another example, when a non-magnetic material is used as the holding member 11A, for example, if a magnet is fixed to the holding member 11A with double-sided tape or the like, a holding member 11A that allows the probe 2 to be detachable can be manufactured.

[0017] The main wall 14A has an outer shape generally in the shape of a rectangular parallelepiped. The main wall 14A has a front surface 18A and a back surface 19A. The front surface 18A and the back surface 19A are planes orthogonal to the X direction. The front surface 18A is a surface for holding the probe 2 of the vibration sensor 1 (that is, the contact portion between the holding member 11A and the vibration sensor 1). The back surface 19A is the surface on the back side of the front surface 18A in the X direction. The thickness direction of the main wall 14A corresponds to the X direction, the width direction of the main wall 14A corresponds to the Y direction, and the longitudinal direction of the main wall 14A corresponds to the Z direction.

[0018] Further, a recess 20A capable of receiving the probe 2 of the vibration sensor 1 is formed in the front surface 18A. The recess 20A is recessed in the X direction from the front surface 18A at the center of the front surface 18A. Also, the recess 20A is, for example, a cylindrical space (that is, a cross-section orthogonal to the X direction is a perfect circle). Furthermore, the recess 20A is a dent that does not penetrate to the back surface 19A. However, the shape of the recess 20A is not limited to the example in FIG. 1. As another example, the recess 20A may be combined with a cross groove into which the protruding piece 17B of the vibration measurement auxiliary device 10B can enter in the above-described cylindrical shape.

[0019] The pair of protruding walls 15A and 16A protrude in the X direction from the back surface 19A of the main wall 14A at positions spaced apart in the Y direction. More specifically, the pair of protruding walls 15A and 16A protrude in the X direction from the back surface 19A of the main wall 14A at both ends of the main wall 14A in the Y direction. However, the protruding directions of the protruding walls 15A and 16A do not have to be orthogonal to the back surface 19A of the main wall 14A. Also, the pair of protruding walls 15A and 16A extend in the Z direction. And in the Z direction, both end faces of the main wall 14A and the pair of protruding walls 15A and 16A are flush. The protruding amount in the X direction and the interval in the Y direction of the pair of protruding walls 15A and 16A are appropriately set according to the shape of the object 5 (more specifically, the curvature of the object 5).

[0020] The protruding piece 17A protrudes in the Z direction from the end face of the main wall 14A facing the Z direction. Also, the protruding piece 17A is provided at the center of the main wall 14A in the Y direction. Also, the protruding piece 17A is set to a size that can enter the recess 20A. More specifically, the length of the protruding piece 17A in the Y direction is set to be equal to or slightly smaller than the diameter of the recess 20A. Further, both end faces of the protruding piece 17A in the Y direction have an arc shape identical to the curvature of the recess 20A. However, as long as the protruding piece 17A can enter the recess 20A, the specific shape is not limited to the above example.

[0021] The pair of magnets 12A and 13A are permanent magnets that detachably fix the holding member 11A to the object 5. The pair of magnets 12A and 13A have a roughly rectangular parallelepiped shape. The pair of magnets 12A and 13A are fixed to the end faces in the Y direction of the pair of protruding walls 15A and 16A. More specifically, the pair of magnets 12A and 13A are fixed to the inner end faces (faces facing each other) in the Y direction of the pair of protruding walls 15A and 16A. The pair of magnets 12A and 13A are also flush with the front end faces (end faces opposite the main wall 14A in the X direction) of the pair of protruding walls 15A and 16A. Furthermore, the pair of magnets 12A and 13A are flush with both end faces in the Z direction of the main wall 14A and the pair of protruding walls 15A and 16A. The method for fixing the magnets 12A and 13A to the protruding walls 15A and 16A is not particularly limited, but possible methods include welding, bonding, and fastening with bolts.

[0022] The pair of magnets 12A and 13A may be fixed to the tip surfaces (the end surfaces opposite to the main wall 14A in the X direction) of the pair of protruding walls 15A and 16A. Alternatively, the pair of magnets 12A and 13A may be fixed to the outer end surfaces in the Y direction of the pair of protruding walls 15A and 16A.

[0023] When the vibration measurement auxiliary device 10A is viewed from the X direction, the recess 20A is positioned between the pair of magnets 12A and 13A in the Y direction. That is, the diameter D1 of the recess 20A is set to be smaller than the distance D2 between the pair of magnets 12A and 13A in the Y direction. In other words, as shown in Figure 5(B), when the two vibration measurement auxiliary devices 10A and 10B are combined, it is desirable to set the diameter D1 of the recess 20A such that the entire end faces of the magnets 12B and 13B of the vibration measurement auxiliary device 10B facing the Z direction are in contact with the surface 18A of the main wall 14A of the vibration measurement auxiliary device 10A. Furthermore, the diameter D1 of the recess 20A is set to be the same as or slightly larger than the diameter of the tip of the probe 2.

[0024] Furthermore, multiple recesses 20A having different diameters D1 may be provided. In this case, there will be recesses of different depths in the Z direction, making it possible to appropriately match various diameters of the tip of the probe 2. In this case, the depth of the recesses should be such that the probe 2 does not shift. In addition, the recesses 20A may be cross-shaped. The width of the recesses 20A in the Y or Z direction should be such that when two vibration measurement auxiliary devices 10A and 10B are combined, the entire end faces of the magnets 12B and 13B of the vibration measurement auxiliary device 10B facing the Z direction can be combined. Furthermore, the depth of the recesses should be such that the two vibration measurement auxiliary devices 10A and 10B do not shift when combined. In this case, since it is not necessary to provide the protruding piece 17A, it can be manufactured at a lower cost, and since the entire end face facing the Z direction is fitted into the recess, it is possible to combine them more securely.

[0025] [Vibration Measurement Method] Figure 2 is a flowchart of the vibration measurement method. Figure 3 shows the state in which vibration in the X direction is being measured. Figure 4 is an exploded perspective view of the two vibration measurement auxiliary devices 10A and 10B before they are combined. Figure 5 is a perspective view of the two vibration measurement auxiliary devices 10A and 10B combined. Figure 6 shows the state in which vibration in the Y direction is being measured. Figure 7 shows the state in which vibration in the Z direction is being measured. Vibration measurement auxiliary device 10A is an example of the first vibration measurement auxiliary device, and vibration measurement auxiliary device 10B is an example of the second vibration measurement auxiliary device.

[0026] First, as shown in Figure 3, the worker fixes the vibration measurement assist device 10A to the object 5 by bringing the magnets 12A and 13A of the vibration measurement assist device 10A into contact with the surface of the object 5. If fins are formed on the surface of the object 5, it is desirable to fix the vibration measurement assist device 10A to the object 5 by aligning the extension direction of the magnets 12A and 13A with the extension direction of the fins. Furthermore, the worker should attach the vibration measurement assist device 10A to the object 5 in a location that is easily accessible (for example, a location where safety can be easily ensured) and in a location that facilitates vibration measurement in steps S1, S3, and S5 (for example, a location where vibration can be measured in a comfortable posture).

[0027] Next, the operator inserts the probe 2 of the vibration sensor 1 into the recess 20A of the vibration measurement auxiliary device 10A to measure the vibration of the object 5 in the X direction (S1). Step S1 is an example of the first measurement step.

[0028] Next, the operator removes the probe 2 from the recess 20A of the vibration measuring auxiliary device 10A and combines the vibration measuring auxiliary devices 10A and 10B as shown in Figures 4 and 5 (S2). More specifically, the operator inserts the protruding piece 17B of the vibration measuring auxiliary device 10B into the recess 20A of the vibration measuring auxiliary device 10A. At this time, the operator does not need to change the position of the vibration measuring auxiliary device 10A. As a result, as shown in Figure 5(B), the magnets 12B and 13B of the vibration measuring auxiliary device 10B come into contact with the surface 18A of the main wall 14A of the vibration measuring auxiliary device 10A, and the vibration measuring auxiliary devices 10A and 10B are fixed to each other. Step S2 is an example of a combination step.

[0029] Here, as shown in Figure 5, with the protruding piece 17B of the vibration measuring auxiliary device 10B entering the recess 20A of the vibration measuring auxiliary device 10A, the operator can rotate the vibration measuring auxiliary device 10B around a rotation axis L that extends in the X direction through the center of the recess 20A of the vibration measuring auxiliary device 10A. Therefore, the operator can adjust the orientation of the vibration measuring auxiliary device 10B so that the surface 18B of the main wall 14B of the vibration measuring auxiliary device 10B is perpendicular to the Y direction.

[0030] Next, as shown in Figure 6, the operator inserts the probe 2 of the vibration sensor 1 into the recess 20B of the vibration measurement auxiliary device 10B to measure the vibration of the object 5 in the Y direction (S3). Step S3 is an example of the second measurement step.

[0031] Next, the operator rotates the vibration measuring auxiliary device 10B 90° around the rotation axis L relative to the vibration measuring auxiliary device 10A, as shown in Figure 7 (S4). At this time, the operator does not need to change the position of the vibration measuring auxiliary device 10A. This adjusts the orientation of the vibration measuring auxiliary device 10B so that the surface 18B of the main wall 14B is perpendicular to the Z direction. As an example, in step S4, the operator may temporarily remove the probe 2 from the recess 20B of the vibration measuring auxiliary device 10B. As another example, the operator may perform the operation in step S4 with the probe 2 still inserted into the recess 20B. Step S4 is an example of a rotation step.

[0032] Next, as shown in Figure 7, the operator inserts the probe 2 of the vibration sensor 1 into the recess 20B of the vibration measurement auxiliary device 10B to measure the vibration of the object 5 in the Z direction (S5). Step S5 is an example of the third measurement step.

[0033] [Examples] To investigate the reproducibility of vibration measurements, vibration measurements were performed on the surface of a vibrating motor. The test method used a Hitachi TFO-K three-phase induction motor as the model rotating equipment, a Fuji Ceramics PAF51C as the vibration measurement sensor, and a JFE Plant Engineering Co., Ltd. Shindo-kun Pro as the vibration diagnostic device. The vibration measurement auxiliary device 10A used was one without the recess 20A.

[0034] Figure 8 summarizes the results (outlined triangles) of measurements taken multiple times at the same location on the surface of a vibrating electric motor by contacting the vibration measurement auxiliary device 10A with the probe 2 of the vibration sensor 1. The vibration measurement auxiliary device 10A was attached and detached after each measurement. For comparison, the same figure also summarizes the results (filled triangles) of measurements taken under the same conditions except that the vibration measurement auxiliary device 10A was not used.

[0035] The following can be seen from the vibration measurement results in Figure 8: (1) When the vibration measurement auxiliary device 10A is not used, there is variation in the vibration measurement results on the motor surface with each measurement. (2) The amplitude values ​​are almost the same whether the vibration measurement auxiliary device 10A is used or not.

[0036] Regarding (1), if the object to be measured is cylindrical, or if the contact area between the sensor surface and the measurement surface of the object to be measured is small, the holding force of the sensor decreases, and the measurement probe becomes unstable due to vibrations of the object to be measured, such as motors, which is thought to cause variations from measurement to measurement. Therefore, by using the vibration measurement auxiliary device 10A, it is possible to ensure a smooth measurement surface even if the shape of the object to be measured is cylindrical, thus enabling stable vibration measurement while suppressing the effects of vibration.

[0037] Regarding (2), since the vibration originates from a vibration source within the object being measured and is transmitted through various components to the external casing of the object being measured, it is thought that the effect of amplitude attenuation is small even when vibration measurement is performed via the vibration measurement auxiliary device 10A.

[0038] With the vibration measurement auxiliary device 10A having a recess as shown in Figure 1, the probe 2 is fixed by the recess, which is thought to enable even more accurate measurements.

[0039] [Effects of the Embodiment] According to the above embodiment, the vibration of the object 5 is measured by the vibration sensor 1 via a vibration measurement auxiliary device 10A fixed to the object 5. Here, the vibration measurement auxiliary device 10A is implemented in a very simple manner, as shown in Figure 1. Furthermore, by separating the vibration sensor 1 and the vibration measurement auxiliary device 10A, highly versatile vibration measurement is realized.

[0040] Furthermore, according to the above embodiment, by forming the holding member 11A from a magnetic material, the probe 2 can be securely fixed to the holding member 11A and can be easily attached and detached. This makes it possible to achieve both precise vibration measurement and versatility.

[0041] Furthermore, according to the above embodiment, by forming a recess 20A for receiving the probe 2 on the surface 18A of the main wall 14A, it is possible to prevent the probe 2 from shifting during vibration measurement. This enables precise vibration measurement.

[0042] Furthermore, according to the above embodiment, by making the protruding piece 17B of the vibration measurement auxiliary device 10B enter the recess 20A of the vibration measurement auxiliary device 10A, the two vibration measurement auxiliary devices 10A and 10B can be appropriately combined. As a result, as shown in Figures 3, 6, and 7, vibration measurement in three directions can be achieved at the same location on the object 5 (a location easily accessible to the operator).

[0043] Furthermore, according to the above embodiment, by making the diameter D1 of the recess 20A smaller than the distance D2 between the pair of magnets 12A and 13A, when the vibration measurement auxiliary devices 10A and 10B are combined as shown in Figure 5, the entire end faces of the magnets 12B and 13B facing the Z direction can be brought into contact with the surface 18A of the main wall 14A. This allows the two vibration measurement auxiliary devices 10A and 10B to be firmly connected, enabling precise vibration measurement.

[0044] Furthermore, according to the above embodiment, by making the curvature of both end faces of the arc-shaped projection 17B the same as that of the recess 20A, the vibration measurement auxiliary device 10B can be rotated around the rotation axis L relative to the vibration measurement auxiliary device 10A when the projection 17B of the vibration measurement auxiliary device 10B is inserted into the recess 20A of the vibration measurement auxiliary device 10A. This makes it possible to perform vibration measurement with the vibration measurement auxiliary devices 10A and 10B in an appropriate position.

[0045] Furthermore, according to the above embodiment, vibration measurement can be performed in three directions at a location easily accessible to the operator by following the procedure shown in Figure 2. This enables simple and highly versatile vibration measurement. Note that the order of vibration measurement in the Y and Z directions (S3, S5) is not limited to the example in Figure 2. That is, one of the vibrations in the Y and Z directions can be measured in the second measurement step, and the other vibration in the Y and Z directions can be measured in the third measurement step.

[0046] [Other forms] The vibration measurement auxiliary device 10A may further include a spacer (not shown). The spacer is positioned between the back surface 19A of the main wall 14A and the pair of magnets 12A and 13A in the X direction. The shape of the surface of the spacer perpendicular to the X direction may, for example, be the same as the back surface 19A of the main wall 14A. The thickness dimension of the spacer in the X direction may be set appropriately according to, for example, the surface shape (e.g., curvature, fin spacing) of the object 5 to which the vibration measurement auxiliary device 10 is fixed.

[0047] Furthermore, the vibration measurement auxiliary device 10A may also include a magnet (not shown) for holding the probe 2. The magnet is attached to the back surface 19A of the main wall 14A at a position that overlaps with the recess 20A when the vibration measurement auxiliary device 10A is viewed from the X direction. This eliminates the need to form the entire holding member 11A out of a magnetic material, thus expanding the range of material options for the holding member 11A. [Explanation of symbols]

[0048] 1…Vibration sensor, 2…Probe, 5…Object, 10A,10B…Vibration measurement auxiliary device, 11A,11B…Holding member, 12A,12B,13A,13B…Magnet, 14A,14B…Main wall, 15A,15B,16A,16B…Protruding wall, 17A,17B…Protruding piece, 18A,18B…Surface, 19A,19B…Back surface, 20A,20B…Recess, L…Rotation axis

Claims

1. In a vibration measurement assist device that assists in measuring the vibration of an object using a vibration sensor, A holding member that detachably holds the vibration sensor, The holding member is equipped with a magnet that detachably secures it to the object, The holding member has a plate-shaped member and a pair of protrusions that protrude in the thickness direction of the plate-shaped member. The vibration measurement assist device is characterized in that the magnet is provided on the protruding portion.

2. In the vibration measurement assist device according to claim 1, The vibration measurement assist device is characterized in that the holding member is made of a magnetic material that detachably fixes the tip of the vibration sensor having a magnet.

3. In the vibration measurement assist device according to claim 1, The vibration measurement assist device is characterized in that the plate-shaped member has a recess formed in the contact portion between the holding member and the vibration sensor to receive the tip of the vibration sensor.

4. In the vibration measurement assist device according to claim 3, The vibration measurement assist device is characterized in that the holding member has a protruding piece that protrudes in the longitudinal or widthwise direction of the plate-shaped member and is sized to enter the recess.

5. In the vibration measurement assist device according to claim 4, A vibration measurement assist device characterized in that the diameter of the cylindrical recess is smaller than the spacing between the magnets in the width direction of the plate-shaped member.

6. In the vibration measurement assist device according to claim 5, A vibration measurement assist device characterized in that both end faces of the protruding piece in a direction perpendicular to the direction of protrusion of the protruding portion have the same arc shape as the curvature of the recess.

7. A vibration measurement method for measuring the vibration of an object using a vibration sensor, comprising combining two vibration measurement auxiliary devices as described in claim 4, A first measurement step involves fixing the pair of magnets of the first vibration measuring auxiliary device to the object, and inserting the tip of the vibration sensor into the recess of the first vibration measuring auxiliary device to measure the vibration of the object in a predetermined first direction; A combination step involves inserting the protruding piece of the second vibration measuring aid into the recess of the first vibration measuring aid to combine the two vibration measuring aids, A second measurement step involves inserting the tip of the vibration sensor into the recess of the second vibration measuring auxiliary device to measure the vibration of the object in one of a predetermined second direction and a predetermined third direction, A rotation step of rotating the second vibration measuring auxiliary device 90° around a rotation axis extending in the predetermined first direction relative to the first vibration measuring auxiliary device, A vibration measurement method characterized by including a third measurement step of inserting the tip of the vibration sensor into the recess of the second vibration measurement auxiliary device to measure the vibration of the object in the other of the predetermined second direction and the predetermined third direction.

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