JP2020016616A - Sensor mounting structure of sensor unit - Google Patents

Abstract

To provide the sensor mounting structure of a sensor unit, capable of suppressing reduction in measurement accuracy in measurement using a sensor and simply exchanging the sensor, in a structure in which the sensor and an information input part are connected by wiring.SOLUTION: The sensor mounting structure 30 of a sensor terminal 32 comprises: a vibration sensor 22 for measuring a motor 18 arranged in an explosion proof area A; a terminal unit 24 including a power supply part 24C and connected to the vibration sensor 22 through a cable 23; a mounting member 42; and a pressing member 44. The mount member 42 including a side wall 55 forming a storage chamber 57 is mounted on the motor 18; the pressing member 44 movable in the direction of inserting and removing the vibration sensor 22 to the storage chamber 57 presses the vibration sensor 22 stored in the storage chamber 57 toward the motor 18; in the side wall 55, the vibration sensor 22 is open on the side drawn from the storage chamber 57; and a notch 64 passing the cable 23 is formed.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a sensor mounting structure of a sensor unit.

  A sensor vibrator to which a cable for extracting information is connected is arranged inside the container body of Patent Literature 1, and is fixed by a sensor fixing jig. Further, a cable outlet through which the cable passes is formed in the container body.

JP-A-2004-245613

  A sensor that measures a measurement target placed in an explosion-proof area and outputs measurement information, and includes an exchangeable power supply unit, is connected to the sensor via wiring, and is an information input that inputs measurement information from the sensor. And a sensor unit provided with a sensor unit. In the sensor unit, since the sensor and the information input unit are connected by wiring, when replacing the power supply unit, not only the information input unit but also the sensor needs to be carried out of the explosion-proof area.

  In the configuration in which the sensor of the sensor unit is provided on the object to be measured using the container body of Patent Literature 1, when the sensor is moved in the insertion / removal direction with respect to the container body for replacement, the wiring is formed in the wall of the cable extraction hole. Caught on When the sensor is replaced because the wiring is caught on the hole wall of the cable extraction hole, it is necessary to move the sensor in the insertion / extraction direction and to insert the wiring into the cable extraction hole or pull out the cable from the cable extraction hole. . Alternatively, it is necessary to remove the wiring from the sensor and then connect the sensor and the wiring again, resulting in a complicated operation.

  Further, in the case of the container body of Patent Document 1, when the sensor fixing jig is removed for the purpose of simplifying the replacement operation of the sensor, the pressing force against the sensor becomes insufficient, and the sensor is used. Measurement accuracy in measurement may be reduced.

  That is, in a configuration in which the sensor and the information input unit are connected by wiring, there is room for improvement in suppressing a decrease in measurement accuracy in measurement using the sensor and simplifying replacement of the sensor.

  The present disclosure, in consideration of the above facts, has a configuration in which a sensor and an information input unit are connected to each other by a wire, thereby suppressing a decrease in measurement accuracy in measurement using a sensor and easily performing sensor replacement. It is an object of the present invention to provide a sensor mounting structure for a sensor unit that can be used.

The sensor mounting structure of the sensor unit according to the first aspect of the present disclosure includes:
A sensor that measures a measurement target placed in an explosion-proof area and outputs measurement information, and includes an exchangeable power supply unit, is connected to the sensor via wiring, and is an information input that inputs measurement information from the sensor. And a sensor mounting structure of the sensor unit comprising:
A mounting member that has a side wall that forms a storage chamber in which the sensor is stored, and is mounted on the measurement target,
A pressing member that is movable in the direction of inserting and removing the sensor with respect to the storage chamber and presses the sensor stored in the storage chamber toward the measurement target,
Has,
The side wall is formed with a cut-out portion that penetrates in a crossing direction that intersects with the insertion / extraction direction, is opened toward a side where the sensor is pulled out of the storage chamber, and through which wiring is passed.

  The notch of the sensor mounting structure of the sensor unit according to the second aspect of the present disclosure may extend beyond the contact position between the pressing member and the sensor.

  An internal thread portion is formed on the inner wall surface of the side wall of the sensor mounting structure of the sensor unit according to the third embodiment of the present disclosure, and the pressing member is configured to be operated to rotate about a rotation axis along a sensor insertion / removal direction. And a shaft extending from the operation unit in the insertion and removal direction to apply a pressing force to the sensor, and a male screw formed on the shaft and screwed into the female screw.

  The elasticity of the contact portion of the pressing member of the sensor mounting structure of the sensor unit according to the fourth aspect of the present disclosure with the sensor may be lower than the elasticity of the sensor.

  The accommodation room of the sensor mounting structure of the sensor unit according to the fifth aspect of the present disclosure may have a flat bottom surface that contacts the end surface of the sensor.

  At the end of the mounting member of the sensor mounting structure of the sensor unit according to the sixth aspect of the present disclosure on the side to be mounted on the object to be measured, a connected part to which the connecting part provided on the object to be measured is connected is formed. May be.

  The width of the part to be coupled in the cross direction intersecting with the insertion and removal direction of the sensor of the sensor mounting structure of the sensor unit according to the seventh aspect of the present disclosure may be smaller than the width of the sensor in the cross direction.

  The mounting member of the sensor mounting structure of the sensor unit according to the eighth aspect of the present disclosure may be a cylindrical body whose axial direction is the insertion / removal direction, and the sensor may contact the measurement target.

  The sensor of the sensor mounting structure of the sensor unit according to the ninth aspect of the present disclosure may be an acceleration sensor formed in a column shape having the insertion / removal direction as the central axis direction.

  According to the present disclosure, in a configuration in which a sensor and an information input unit are connected by wiring, a sensor of a sensor unit that can suppress a decrease in measurement accuracy in measurement using the sensor and can easily perform replacement of the sensor An attachment structure can be provided.

It is an explanatory view showing the outline of the data collection system using the sensor unit according to the first embodiment. FIG. 4 is an explanatory diagram illustrating an example of an installation state of the sensor unit according to the first embodiment. It is a lineblock diagram of a sensor unit concerning a 1st embodiment. FIG. 4 is an explanatory diagram illustrating a state in which the sensor according to the first embodiment is accommodated in a holder. FIG. 3 is an explanatory diagram illustrating a state in which the holder according to the first embodiment is viewed from the front. FIG. 4 is an explanatory diagram illustrating a state in which the holder according to the first embodiment is viewed in plan. FIG. 7 is a transverse cross-sectional view (a cross-sectional view along line 7-7 in FIG. 4) of the holder according to the first embodiment. It is an explanatory view showing the state where a sensor concerning a 2nd embodiment was stored in a holder. It is an explanatory view showing the state where a sensor concerning a 3rd embodiment was stored in a holder. FIG. 11 is an explanatory diagram illustrating a state in which a sensor according to a first modification is accommodated in a holder. It is an explanatory view showing a state where a sensor concerning a 2nd modification was stored in a holder. It is an explanatory view showing the state where the sensor concerning the 3rd modification was stored in the holder. It is an explanatory view showing the state where a sensor concerning a 4th modification was stored in a holder.

  Hereinafter, an example of the sensor mounting structure of the sensor unit according to the present disclosure will be described.

[First Embodiment]
The data collection system 10 illustrated in FIG. 1 includes a plurality of sensor terminals 32 as an example of a sensor unit installed for each measurement target, one collection terminal 14, and one computer 16. The measurement object in the present embodiment is, for example, a motor 18 (see FIG. 2) for driving a fan (not shown). In the data collection system 10, the vibration of the motor 18 is measured (detected) in each sensor terminal 32, and the obtained measurement value is collected by the collection terminal 14 via wireless communication. The measurement data collected by the collection terminal 14 is transferred to the computer 16.

  The motor 18 shown in FIG. 2 is disposed in an explosion-proof area A where, for example, combustible gas is handled. The motor 18 has a drive unit 18A and a cover 18B that covers the drive unit 18A. The cover 18B is made of a magnetic material (eg, iron).

  As an example, the sensor terminal 32 illustrated in FIG. 3 includes a vibration sensor 22 that measures the vibration (acceleration) of the motor 18 (see FIG. 2) and a terminal unit in which a circuit for controlling and communicating with the sensor terminal 32 is built. 24. The vibration sensor 22 and the terminal unit 24 are electrically connected via a cable 23 as an example of wiring. The terminal unit 24 is an example of an information input unit. Further, the measurement information of the vibration of the motor 18 is input to the terminal unit 24 from the vibration sensor 22.

  The vibration sensor 22 is housed in a holder unit 40 (see FIG. 2) described later attached to the cover 18B (see FIG. 2). The vibration sensor 22 measures the vibration of the motor 18 and outputs measurement information of the vibration to the terminal unit 24. The vibration sensor 22 is configured as a piezoelectric acceleration sensor having a weight and a piezoelectric element (not shown), for example. Further, the vibration sensor 22 is formed in a columnar shape with the insertion / removal direction with respect to the holder unit 40 as the central axis direction. Specifically, the vibration sensor 22 includes a measurement unit (not shown) that measures acceleration, and a cover member 25 that is formed in a cylindrical shape whose both ends in the axial direction are closed and houses the measurement unit inside. I have. The cover member 25 is made of, for example, stainless steel.

  In the following description, the insertion / removal direction (center axis direction) of the vibration sensor 22 is referred to as a Z direction. The radial direction of the vibration sensor 22 is referred to as a D direction. Further, the circumferential direction of the vibration sensor 22 is referred to as an R direction (see FIG. 7). The Z direction and the D direction are orthogonal. The D direction is an example of an intersecting direction that intersects the Z direction.

  A length corresponding to the height of the cover member 25 in the Z direction is defined as L1 [mm]. The length corresponding to the diameter of the cover member 25 in the direction D is L2 [mm]. In the cover member 25, a through hole (not shown) is penetrated in a part of the side wall 25A constituting the outer periphery and above the center in the Z direction in parallel with the D direction. One end of the cable 23 is passed through the through hole of the side wall 25A. The lower end surface 25B in the Z direction and the upper upper surface 25C of the cover member 25 are, for example, flat surfaces orthogonal to the center axis of the vibration sensor 22.

  The terminal unit 24 includes a main body case 24A, a circuit board 24B and a power supply unit 24C provided in the main body case 24A. As an example, the power supply unit 24C is formed in a box shape for accommodating a plurality of batteries (not shown), and is provided exchangeably in the main body case 24A. Since the circuit board 24B and the power supply unit 24C are covered by the main body case 24A, it is necessary to open the main body case 24A when replacing the power supply unit 24C. In other words, in the sensor terminal 32, since the vibration sensor 22 and the terminal unit 24 are connected by the cable 23, when replacing the power supply unit 24C outside the explosion-proof area A, not only the terminal unit 24 but also the vibration The sensor 22 also needs to be carried out of the explosion-proof area A.

  In the collection terminal 14 shown in FIG. 1, measurement data from each sensor terminal 32 is received and collected by performing wireless communication. The size of the collection terminal 14 is, for example, a size that can be accommodated in a work clothes pocket. Then, the collection terminal 14 is connected to the computer 16 using a cable (not shown), so that the collected measurement data is transferred to the computer 16. In the computer 16, the measurement data collected by the collection terminal 14 is stored, or the measurement data is displayed on a monitor.

(Main part configuration)
Next, the mounting structure 30 as an example of the sensor mounting structure of the sensor unit will be described.

  The mounting structure 30 shown in FIG. 2 is, for example, a mounting structure for mounting the vibration sensor 22 of the sensor terminal 32 to the motor 18, and has a holder unit 40. The holder unit 40 has a mounting member 42 and a pressing member 44. Further, the holder unit 40 houses the vibration sensor 22 (see FIG. 3). Note that the center axis direction of the holder unit 40 is aligned with the Z direction which is the center axis direction of the vibration sensor 22. Hereinafter, the holder unit 40 will be described using the Z direction, the D direction, and the R direction.

<Mounting member>
The attachment member 42 shown in FIG. 4 includes, as an example, a holder main body 52 and a magnet 54.

(Holder body)
The holder main body 52 is an iron member in which a disc-shaped bottom portion 53 whose thickness direction is in the Z direction and a cylindrical side wall 55 that stands upright in the Z direction from the periphery of the bottom portion 53 are integrated. In other words, the holder main body 52 is formed in a bottomed cylindrical shape with only one end in the Z direction opened, and has the side wall 55. An imaginary straight line passing through the center of the circle of the bottom 53 and extending along the Z direction is referred to as an axis C. The axis C is the center axis of the holder main body 52.

  The bottom portion 53 has a bottom surface 53A as an upper surface orthogonal to the axis C on one side (upper side) in the Z direction, and a lower surface 53B orthogonal to the axis C on the other side (lower side) in the Z direction. The bottom surface 53A is, for example, a flat surface, and is in contact with the end surface 25B of the vibration sensor 22 in the Z direction. The shape of the bottom surface 53A is circular when viewed from the Z direction. The length L3 [mm] corresponding to the diameter of the bottom surface 53A in the D direction is longer than the length L2 described above.

  The lower surface 53B is, for example, a flat surface, and comes into contact with a magnet 54 described later in the Z direction. The lower surface 53B has a circular shape when viewed from the Z direction. In addition, when viewed in the Z direction, a tapered surface 53C that extends in an oblique direction that intersects the Z direction is formed outside the lower surface 53B in the D direction. A length L4 [mm] corresponding to the diameter of the bottom portion 53 in the D direction is longer than the length L3.

  The side wall 55 is formed in a cylindrical shape extending in the Z direction with the axis C as a central axis. The length corresponding to the height of the side wall 55 in the Z direction is L5 [mm]. The length L5 is longer than the length L1 described above, and is, for example, about 1.5 times the length L1. An upper surface 55 </ b> A, which is a flat surface extending in a direction orthogonal to the axis C, is formed at the upper end of the side wall 55 in the Z direction. When viewed from the Z direction, tapered surfaces 55B extending in an oblique direction intersecting the Z direction are formed on the outer side and the inner side in the D direction with respect to the upper surface 55A.

  The side wall 55 shown in FIG. 7 is formed in an annular shape when viewed from the Z direction, and has an inner wall surface 55C and an outer wall surface 55D. The length corresponding to the diameter in the direction D of the inner wall surface 55C is L3. The length corresponding to the diameter in the D direction of the outer wall surface 55D is L4. The thickness t [mm] of the side wall 55 in the D direction is t = (L4−L3) / 2.

  A housing chamber 57 is formed by the bottom 53 and the side wall 55 shown in FIG. In other words, the accommodation room 57 has a bottom surface 53A and an inner wall surface 55C. The accommodation chamber 57 accommodates the vibration sensor 22. Specifically, the vibration sensor 22 is housed in the housing chamber 57 in a state where the end surface 25B and the bottom surface 53A are in surface contact. A helical female screw portion 62 having a screw axis direction in the Z direction is formed in a portion of the inner wall surface 55C above the opening in the Z direction.

  When the vibration sensor 22 is housed in the housing chamber 57, a gap B is formed in the direction D between the vibration sensor 22 and the inner wall surface 55C. The size of the gap B is set within a range in which contact resonance caused by contact between the vibration sensor 22 and the holder main body 52 is suppressed.

  A notch 64 is formed in the side wall 55 shown in FIG. The notch 64 penetrates the side wall 55 in the direction D. The notch 64 is a part of the side wall 55 cut out from the upper surface 55A toward the lower side in the Z direction in a part of the side wall 55 in the R direction. In other words, the notch 64 is open toward the side (the upper side in the Z direction) from which the vibration sensor 22 is withdrawn from the storage chamber 57.

  The notch 64 is formed in a U-shape when viewed from the direction D, for example. Specifically, the cutout portion 64 includes an opposing surface 64A, an opposing surface 64B, and a curved surface 64C formed on the side wall 55. The facing surface 64A and the facing surface 64B are flat surfaces along the Z direction and the D direction, and are disposed facing the R direction. The curved surface 64C is curved downward in the Z direction, and connects the lower end of the opposing surface 64A in the Z direction and the lower end of the opposing surface 64B in the Z direction in the R direction.

  The length of the notch 64 in the Z direction is L6 [mm]. In the state where the vibration sensor 22 is accommodated in the accommodation room 57, the contact position between the pressing member 44 and the vibration sensor 22 can be visually recognized from the outside through the cutout portion 64, and the length L6 is such that the cable 23 passes in the D direction. Is set as a length that enables In other words, the notch 64 extends below the contact position between the pressing member 44 and the vibration sensor 22 to the lower side in the Z direction when viewed from the D direction. 4, the length from the bottom surface 53A to the lower end of the curved surface 64C in the Z direction is L7 [mm]. The length L7 is, for example, about ／ of the length L1.

  In the cutout portion 64 shown in FIG. 7, when viewed from the Z direction, the facing surface 64A and the facing surface 64B are arranged at an interval of length L8 [mm] in the D direction. The length L8 is longer than the length corresponding to the diameter of the cable 23 (see FIG. 2). In other words, the cable 23 can be moved in the Z direction in the notch 64 when the cable 23 is passed through the notch 64 and there is no screw member 56 (see FIG. 4) described later.

(magnet)
The magnet 54 shown in FIG. 4 is formed of a permanent magnet, and is formed in a cylindrical shape having the Z direction as an axial direction. The length corresponding to the height of the magnet 54 in the Z direction is shorter than the length L5. The magnet 54 has an upper surface 54A on the upper side in the Z direction and a lower surface 54B on the lower side in the Z direction. The upper surface 54A is a flat surface along the direction D, and has substantially the same size as the lower surface 53B. The lower surface 54B has a curved surface whose central portion is located above the both ends in the Z direction when viewed from one direction, and is in surface contact with the surface of the cover portion 18B described above.

  The mounting member 42 is formed by integrating the upper surface 54A and the holder main body 52 by the magnetic force of the magnet 54. When the lower surface 54B comes into contact with the cover portion 18B, the mounting member 42 is mounted on the motor 18 (see FIG. 2).

<Pressing member>
The pressing member 44 shown in FIG. 4 includes, for example, a screw member 56 and a spacer 58.

(Screw member)
The screw member 56 has an operation portion 66, a shaft portion 67 extending from the operation portion 66 in the Z direction, and a male screw portion 68 formed on an outer peripheral portion of the shaft portion 67. The male screw portion 68 is configured to be screwed into the female screw portion 62 by being rotated around the axis C.

  The operation unit 66 shown in FIG. 6 has a disk-shaped part having the thickness direction in the Z direction and the radial direction in the D direction, and has a D-cut shape at two locations facing the D direction when viewed from the Z direction. It has been. That is, the operation unit 66 has two D-cut surfaces 66A. The two D-cut surfaces 66 </ b> A are gripped by a finger during the rotation operation of the operation unit 66. The operation unit 66 is rotated around the axis C with the axis C as a rotation axis (center axis) when viewed from the Z direction.

  The shaft 67 shown in FIG. 4 is formed in a substantially columnar shape extending in the Z direction. The length of the shaft portion 67 in the Z direction is such that when the male screw portion 68 is screwed into the female screw portion 62, the screw member 56 presses the vibration sensor 22 downward in the Z direction via the spacer 58. The length is such that a force can be applied. The lower surface 67A, which is the lower end surface of the shaft portion 67 in the Z direction, is, for example, a flat surface in the D direction and formed in a circular shape when viewed from the Z direction.

(Spacer)
The spacer 58 is, for example, made of Teflon (registered trademark) and formed in a disk shape. The length corresponding to the diameter in the D direction of the spacer 58 is, for example, longer than the above-described length L2 and shorter than the above-described length L3. That is, the spacer 58 is configured to be housed in the housing chamber 57 together with the vibration sensor 22. Further, the spacer 58 forms a contact portion of the pressing member 44 with the vibration sensor 22 in a state where the spacer 58 is accommodated in the accommodation chamber 57. The elastic modulus of the spacer 58 is lower than the elastic modulus of the cover member 25 (see FIG. 3) of the vibration sensor 22.

  The upper surface 58A on the upper side in the Z direction of the spacer 58 is in contact with the lower surface 67A of the shaft portion 67. The lower surface 58B on the lower side in the Z direction of the spacer 58 is in contact with the upper surface 22C of the vibration sensor 22. The spacer 58 is not limited to a configuration separate from the screw member 56, and may be a configuration integrated with the screw member 56 by being fixed to the shaft 67 with an adhesive.

  In summary, the pressing member 44 is configured to be movable in the insertion / removal direction (Z direction) of the vibration sensor 22 with respect to the storage chamber 57, and is screwed into the holder main body 52 so that the vibration sensor stored in the storage chamber 57 can be moved. It is configured to be pressed toward the motor 18.

[Action]
Next, the operation of the mounting structure 30 according to the first embodiment will be described.

  The attachment member 42 is attached to the cover 18B of the motor 18 shown in FIG. 2 by the magnetic force of the magnet 54. The mounting member 42 and the pressing member 44 are connected by screwing the male screw part 68 shown in FIG. 4 into the female screw part 62. When the vibration sensor 22 is housed in the housing chamber 57, the operating member 66 is rotated in the direction opposite to the screwing direction, whereby the pressing member 44 is detached and the housing chamber 57 is released.

  Here, since the notch 64 is opened in the Z direction and the cable 23 can be inserted into the notch 64 in a state where the cable 23 is connected to the vibration sensor 22, the operation of inserting the vibration sensor 22 into the accommodation chamber 57 is simplified. Can be done. When the cable 23 is passed through the notch 64 and the vibration sensor 22 and the spacer 58 are housed in the housing chamber 57, the operation part 66 is rotated in the screwing direction, so that the male screw part 68 becomes a female screw. It is screwed into the part 62.

  By screwing the screw member 56, the shaft 67 and the spacer 58 are in contact, and the spacer 58 and the vibration sensor 22 are in contact. Then, by increasing the screwing amount of the screw member 56, a pressing force is applied to the vibration sensor 22 downward in the Z direction. In a state where the vibration sensor 22 is receiving the pressing force, the close contact state between the end face 25B and the bottom surface 53A is maintained, so that the vibration of the motor 18 is smaller than the vibration sensor 22 in which the pressing force is not applied to the vibration sensor 22. It is easy to be transmitted to. Since the vibration of the motor 18 is easily transmitted to the vibration sensor 22, a decrease in the measurement accuracy of the vibration of the motor 18 can be suppressed. The measurement information measured by the vibration sensor 22 is collected by the collection terminal 14 (see FIG. 1) via the terminal unit 24 (see FIG. 2) and transferred to the computer 16 (see FIG. 1).

  In the sensor terminal 32 shown in FIG. 3, when the capacity of the plurality of batteries of the power supply unit 24C decreases due to continued use, the power supply unit 24C needs to be replaced. The work of replacing the power supply unit 24C includes the work of opening the main body case 24A, the work of replacing the power supply unit 24C, and the work of closing the main body case 24A. Therefore, it takes time to replace the power supply unit 24C.

  However, since the motor 18 (see FIG. 2) and the sensor terminal 32 are disposed in the explosion-proof area A, the time-consuming replacement work of the power supply unit 24C cannot be performed in the explosion-proof area A. That is, in order to replace the power supply unit 24C, it is necessary to carry the terminal unit 24 out of the explosion-proof area A. Further, in the sensor terminal 32, since the vibration sensor 22 and the terminal unit 24 are connected by the cable 23 and cannot be separated, when replacing the power supply unit 24C, not only the terminal unit 24 but also the vibration sensor 22 is in the explosion-proof area. It is necessary to carry it out of A.

  Here, in the mounting structure 30 shown in FIG. 4, the pressing member 44 is configured to be movable in the Z direction. Specifically, the vibration sensor 22 can be taken out of the housing chamber 57 in the Z direction by rotating the operation unit 66 and releasing the fastening state between the male screw portion 68 and the female screw portion 62. On the other hand, the vibration sensor 22 can be attached to the motor 18 by rotating the operation part 66 and fastening the male screw part 68 and the female screw part 62. In other words, the operation of moving (rotating) the operation unit 66 allows the vibration sensor 22 to be attached to or removed from the motor 18, so that the vibration sensor 22 can be easily replaced. it can.

  As described above, according to the mounting structure 30, the measurement accuracy in the measurement using the vibration sensor 22 can be prevented from lowering, and the vibration sensor 22 can be easily replaced.

  Further, in the mounting structure 30, the notch 64 extends beyond the contact position between the pressing member 44 and the vibration sensor 22. That is, since the contact position between the pressing member 44 and the vibration sensor 22 can be visually recognized through the cutout portion 64, it is possible to suppress the vibration sensor 22 from being excessively pressed by the pressing member 44.

  Further, in the mounting structure 30, by rotating the operation portion 66 about the axis C, the male screw portion 68 and the female screw portion 62 are connected, and a pressing force is applied to the vibration sensor 22. In other words, as compared with a configuration in which the operation unit 66 is gripped and linearly moved in the Z direction, the space required for operation is smaller on one side (upper side) in the Z direction than the vibration sensor 22. 30 can be prevented from increasing in size.

  In addition, in the mounting structure 30, the elastic modulus of the spacer 58, which is the contact portion of the pressing member 44 with the vibration sensor 22, is lower than the elastic modulus of the cover member 25. Since the elastic modulus of the spacer 58 is lower than the elastic modulus of the cover member 25, the spacer 58 is easily deformed as compared with a configuration having the same elastic modulus. Since the spacer 58 is easily deformed, the adhesiveness between the spacer 58 and the cover member 25 is increased, and a force for restricting the rotation of the pressing member in the reverse direction is easily applied, so that the male screw portion 68 and the female screw portion 62 are formed. Can be prevented from loosening.

  In the mounting structure 30, the accommodation chamber 57 has a flat bottom surface 53A. In other words, the contact state between the vibration sensor 22 and the mounting member 42 is not a point contact state or a line contact state, but is a surface contact state. Vibration from 18 to vibration sensor 22 is easily transmitted. Since the vibration of the motor 18 is easily transmitted to the vibration sensor 22, a decrease in the measurement accuracy of the vibration of the motor 18 can be suppressed.

  Further, in the mounting structure 30, the vibration sensor 22 is an acceleration sensor formed in a column shape with the Z direction as the central axis direction. By virtue of being formed in a columnar shape, the contact area between the bottom surface 53A and the vibration sensor 22 is larger than that of a configuration formed in a hemispherical shape, so that vibration from the motor 18 to the vibration sensor 22 is easily transmitted. Become. Since the vibration of the motor 18 is easily transmitted to the vibration sensor 22, a decrease in the measurement accuracy of the vibration of the motor 18 can be suppressed.

  In addition, in the mounting structure 30, as described above, since the cutout portion 64 penetrates in the D direction and extends in the Z direction, the cable 23 extends from the vibration sensor 22 in the D direction. Also, the vibration sensor 22 can be replaced in the Z direction without disconnecting the cable 23. In other words, the cable 23 does not have to extend from the vibration sensor 22 in the Z direction, and a part of the upper surface 25C (see FIG. 3) is not cut away for connection of the cable 23. A decrease in the contact area with the substrate can be suppressed.

[Second embodiment]
Next, an example of a sensor mounting structure of the sensor unit according to the second embodiment will be described. In addition, about the same structure as 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected and description of a structure and an effect is abbreviate | omitted.

  FIG. 8 shows a mounting structure 70 as an example of a sensor mounting structure of the sensor unit according to the second embodiment. The mounting structure 70 has a holder main body 72 in place of the holder main body 52 (see FIG. 4) and a set screw 74 in place of the magnet 54 (see FIG. 4) with respect to the mounting structure 30 (see FIG. 4). The configuration is different. The basic configuration other than the holder body 72 and the set screw 74 is the same as that of the first embodiment.

  A screw hole 76 that is recessed in the normal direction is formed on the outer peripheral portion of the cover 18B of the motor 18. A set screw 74 is fastened to the screw hole 76 using a hexagon wrench (not shown). The set screw 74 protrudes in the normal direction from the outer peripheral surface of the cover 18B in the fastened state. The set screw 74 is an example of a connecting portion provided on the motor 18.

(Holder body)
The holder main body 72 is configured such that a screw hole 78 as an example of a portion to be coupled is formed in the holder main body 52 (see FIG. 4). The configuration other than the screw hole 78 is the same as that of the holder main body 52, and thus the description is omitted. A set screw 74 is connected (fastened) to the screw hole 78. Specifically, the screw hole 78 is formed at the end (bottom 53) of the holder main body 72 on the side attached to the motor 18. The screw hole 78 is formed with the axis C as the central axis.

  In the direction D, the length L9 corresponding to the width of the screw hole 78 is shorter than the length L2 (see FIG. 4) corresponding to the width of the vibration sensor 22. In other words, in the direction D, the width of the screw hole 78 is smaller than the width of the vibration sensor 22. As an example, the length L9 is about １ ／ of the length L2. The holder main body 72 is fixed to the motor 18 in advance by being fastened to a set screw 74 of the cover 18B.

[Action]
Next, the operation of the mounting structure 70 according to the second embodiment will be described with reference to FIG. Except for the main function, the description of the same function as that of the mounting structure 30 will be omitted.

  In the mounting structure 70, the vibration sensor 22 can be mounted on the motor 18 or the vibration sensor 22 can be removed by moving (rotating) the pressing member 44, so that the vibration sensor 22 can be easily replaced. be able to. Further, by the screwing of the screw member 56, a pressing force is applied to the vibration sensor 22 downward in the Z direction. In a state where the vibration sensor 22 is receiving the pressing force, the close contact state between the end face 25B and the bottom surface 53A is maintained, so that the vibration of the motor 18 is smaller than the vibration sensor 22 in which the pressing force is not applied to the vibration sensor 22. It is easy to be transmitted to. Since the vibration of the motor 18 is easily transmitted to the vibration sensor 22, a decrease in the measurement accuracy of the vibration of the motor 18 can be suppressed.

  In addition, in the mounting structure 70, since the mounting member 42 (holder body 72) is mounted on the motor 18 via the set screw 74, the mounting member 42 is attached to the motor 18 with an adhesive as compared with a configuration in which the mounting member 42 is mounted on the motor 18 with an adhesive. 18 can be securely mounted.

  Further, in the mounting structure 70, since the length L9 is shorter than the length L2 (see FIG. 4), not only the set screw 74 but also the holder body 72 on the vibration transmission path from the cover 18B to the vibration sensor 22. Will intervene. In other words, in the mounting structure 70, the portion where the holder main body 72 is interposed between the cover portion 18B and the vibration sensor 22 is increased as compared with a configuration in which the length L9 is equal to the length L2. The vibration to 22 is easily transmitted. Since the vibration of the motor 18 is easily transmitted to the vibration sensor 22, a decrease in the measurement accuracy of the vibration of the motor 18 can be suppressed.

[Third Embodiment]
Next, an example of a sensor mounting structure of the sensor unit according to the third embodiment will be described. In addition, about the same structure as 1st, 2nd embodiment, the same code | symbol as 1st, 2nd embodiment is attached | subjected, and description of structure and effect | action is abbreviate | omitted.

  FIG. 9 shows a mounting structure 80 as an example of a sensor mounting structure of the sensor unit according to the third embodiment. The attachment structure 80 is, for example, an attachment structure for attaching the vibration sensor 22 (see FIG. 2) of the sensor terminal 32 (see FIG. 2) to the motor 18 (see FIG. 2), and has a holder unit 90. The holder unit 90 has a mounting member 92 and a pressing member 44. The vibration sensor 22 is housed in the holder unit 90. Note that the center axis direction of the holder unit 90 is aligned with the Z direction.

  The attachment member 92 is configured by a holder body 94 as an example. The holder main body 94 is a cylindrical body having the Z direction as the axial direction (the axis C being the central axis). Both ends in the Z direction of the holder body 94 are open. Specifically, the holder main body 94 has a side wall 96 whose shape when viewed from the Z direction is annular.

  The side wall 96 has the axis C as a central axis. The length corresponding to the height of the side wall 96 in the Z direction is, for example, a length L5. The side wall 96 has an inner wall surface 55C and an outer wall surface 55D. A space inside the inner wall surface 55C is a housing room 98. The accommodation room 98 accommodates the vibration sensor 22. The lower end of the side wall 96 in the Z direction (the end on the motor 18 side) is depressed in accordance with the curved surface of the cover 18B. The end surface 96A on the lower side in the Z direction of the side wall 96 is adhered to the cover portion 18B using an adhesive 97. When the vibration sensor 22 is housed in the housing chamber 98, the vibration sensor 22 and the cover 18B are in direct contact with each other.

  A helical female screw portion 62 having a screw axis direction in the Z direction is formed in a portion of the inner wall surface 55C above the opening in the Z direction. Further, a cutout portion 64 is formed in the side wall 96.

[Action]
Next, the operation of the mounting structure 80 according to the third embodiment will be described with reference to FIG. Except for the main function, a description of the same function as that of the mounting structure 30 (see FIG. 4) will be omitted.

  In the mounting structure 80, the lower end in the Z direction of the mounting member 92 is opened, and the vibration sensor 22 and the motor 18 are in direct contact with each other, so that another member is interposed between the vibration sensor 22 and the motor 18. In comparison, the vibration from the motor 18 to the vibration sensor 22 is easily transmitted. Since the vibration of the motor 18 is easily transmitted to the vibration sensor 22, a decrease in the measurement accuracy of the vibration of the motor 18 can be suppressed. Further, in the mounting structure 80, the vibration sensor 22 can be mounted on the motor 18 or the vibration sensor 22 can be removed by moving (rotating) the pressing member 44, so that the vibration sensor 22 can be easily replaced. Can be done.

  Note that the present disclosure is not limited to the above embodiment. Hereinafter, each modified example will be described. In addition, about the structure similar to each embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

<First Modification>
FIG. 10 shows an attachment structure 100 as an example of the sensor attachment structure of the sensor unit. The attachment structure 100 has a configuration in which the attachment member 42 is attached to the cover portion 18B using the adhesive 102 without using the magnet 54 (see FIG. 4) in the attachment structure 30 (see FIG. 4). . The lower end of the bottom 53 in the Z direction is recessed in accordance with the curved surface of the cover 18B. By using the adhesive 102 without using the magnet 54, the length of the vibration transmission path from the cover portion 18B to the vibration sensor 22 can be shortened.

<Second modification>
FIG. 11 shows a mounting structure 110 as an example of a sensor mounting structure of the sensor unit. The attachment structure 110 has a configuration in which the attachment member 42 is attached to the cover portion 18B using the adhesive pad 112 without using the magnet 54 (see FIG. 4) in the attachment structure 30 (see FIG. 4). . The thickness of the bonding pad 112 in the Z direction is smaller than the thickness of the magnet 54 in the Z direction. By using the bonding pad 112 without using the magnet 54, the length of the vibration transmission path from the cover 18B to the vibration sensor 22 can be shortened.

<Third Modification>
FIG. 12 shows an attachment structure 120 as an example of the sensor attachment structure of the sensor unit. The attachment structure 120 is configured such that the attachment member 42 is attached to the cover portion 18B by using the weld nut 122 without using the magnet 54 (see FIG. 4) in the attachment structure 30 (see FIG. 4). . Specifically, weld nut 122 is welded to cover portion 18B with the Z direction as the axial direction. The weld nut 122 has a female screw portion (not shown).

  On the other hand, at the lower end of the mounting member 42 in the Z direction, a columnar shaft portion 124 extending downward from the center in the D direction toward the lower side in the Z direction is formed. A male screw portion (not shown) is formed on the outer peripheral surface of the shaft portion 124. The mounting member 42 is mounted on the cover 18B by fastening the male screw of the shaft 124 to the female screw of the weld nut 122. By using the weld nut 122, the mounting member 42 can be securely mounted on the motor 18.

<Fourth modification>
FIG. 13 shows a mounting structure 130 as an example of a sensor mounting structure of the sensor unit. The mounting structure 130 has a configuration in which a holder unit 140 is provided instead of the holder unit 40 of the mounting structure 30 (see FIG. 4). The holder unit 140 has a mounting member 142 and a pressing member 144.

  The mounting member 142 has a bottom 53 and a side wall 55. The accommodation chamber 57 is formed in the attachment member 142. The bottom 53 is attached to the cover 18B using an adhesive pad 112. A cutout 64 is formed in the side wall 55. Further, at the upper end portion in the Z direction of the outer wall surface 55D of the side wall 55 and at a position shifted by 90 ° in the R direction with respect to the notch portion 64, a concave portion 143 depressed inward in the D direction is formed. .

  Further, a protruding portion 145 protruding outward in the D direction is formed on a side of the side wall 55 opposite to the concave portion 143 side in the D direction. The projection 145 is formed with a pair of vertical walls 147 arranged at intervals in the R direction and standing upright from the projection 145 in the Z direction. In FIG. 13, only one vertical wall 147 is shown, and illustration of the other vertical wall 147 is omitted. In the pair of vertical walls 147, a through hole (not shown) penetrating in the R direction is formed. A pin 148 described later is inserted into a through hole of the vertical wall 147.

  The pressing member 144 includes, for example, a lid member 146 and a spacer 58. The cover member 146 includes a column-shaped main body 146A having a height in the Z direction, a disk-shaped knob 146B provided above the main body 146A in the Z direction, and having a thickness in the Z direction. And a projection 146C protruding outward in the direction D from a part of the portion 146A. A plate-shaped engaging portion 146D extending downward in the Z direction is formed on the main body 146A on the side opposite to the protruding portion 146C in the D direction. The engaging portion 146D is formed so as to be able to engage with the concave portion 143. A spacer 58 is bonded to the center of the main body 146A in the D direction and to the lower surface in the Z direction.

  The protrusion 146C has a through hole 146E penetrating in the R direction. The size of the through hole 146E is such that a cylindrical pin 148 can be inserted. The size of the protrusion 146C in the R direction is a size that can be inserted between the pair of vertical walls 147. Here, a hinge portion 149 is formed by arranging the protruding portion 146C between the pair of vertical walls 147, and inserting the pin 148 into the through hole 146E and the through hole (not shown) of the vertical wall 147. In other words, the pressing member 144 is connected to the mounting member 142 via the hinge 149.

  In the mounting structure 130, the pressing member 144 is rotated around the pin 148, and the engaging portion 146 </ b> D is engaged with the concave portion 143, so that the vibration sensor 22 in the storage chamber 57 is moved in the Z direction by the pressing member 144. It is pressed down. Further, in the mounting structure 130, the engagement between the engagement portion 146D and the recessed portion 143 is released, and the pressing of the vibration sensor 22 is released by the rotation of the pressing member 144 around the pin 148. 22 can be replaced.

<Other modifications>
In the mounting structure 30, the mounting structure 70, and the mounting structure 80, the notch 64 does not have to extend to the contact position between the pressing member 44 and the vibration sensor 22. The notch 64 may be extended as long as it does not affect the insertion and removal of the cable 23. Further, in the mounting structure 30, the mounting structure 70, and the mounting structure 80, as in the case of the mounting structure 130, the configuration may be such that the connection between the male screw portion 68 and the female screw portion 62 is not used.

  Furthermore, in the mounting structure 30, the mounting structure 70, and the mounting structure 80, the elastic modulus of the contact portion of the pressing member 44 with the vibration sensor 22 may be equal to or greater than the elastic modulus of the vibration sensor 22. In addition, in the mounting structure 30, the mounting structure 70, and the mounting structure 80, the vibration sensor 22 is not limited to a columnar shape, and may have another shape such as a rectangular parallelepiped, a cube, a hemisphere, and a sphere. The spacer 58 is not limited to Teflon (registered trademark), and may be made of another resin member or rubber. The pressing member 44 is not limited to the configuration in which the screw member 56 and the spacer 58 are separate bodies, and may have a configuration in which the spacer 58 is embedded at the lower end of the screw member 56 in the Z direction and integrated. Further, the entire pressing member 44 may be made of resin.

  In the mounting structure 30 and the mounting structure 70, the bottom surface 53A is not limited to a flat surface, but may be a curved surface, or may have a shape that repeats peaks and valleys.

  In the mounting structure 70, the width of the screw hole 78 in the D direction of the vibration sensor 22 may be equal to or larger than the width of the vibration sensor 22 in the D direction. In the mounting structure 70, a stud may be provided instead of the set screw 74, and the mounting member 42 may be mounted on the motor 18.

  In the attachment structure 80, the surface shape of the lower end of the vibration sensor 22 in the Z direction may be made the same as the surface shape of the cover 18B to increase the contact area between the vibration sensor 22 and the cover 18B. Further, in the mounting structure 80, a pedestal portion having a flat upper surface may be provided on the cover portion 18B, and the vibration sensor 22 may be brought into contact with the pedestal portion.

  The measurement object is not limited to the motor 18 and may be another member or another unit (apparatus). The sensor is not limited to the vibration sensor 22, and may be other various sensors such as a temperature sensor, a pressure sensor, and an optical sensor. The wiring is not limited to the cable 23 but may be a harness.

  The magnet 54 is not limited to the column-shaped configuration, but may be a clog-shaped configuration straddling the curved surface of the cover portion 18B or an arch-shaped configuration.

Reference Signs List 10 data collection system, 14 collection terminal, 16 computer, 18 motor (example of measurement object), 18A drive unit, 18B cover unit, 22 vibration sensor (example of sensor), 22C top surface, 23 cable (example of wiring), 24 terminal section (an example of an information input section), 24A body case, 24B circuit board, 24C power supply section, 25 cover member, 25A side wall, 25B end face, 25C top face, 30 mounting structure (an example of a sensor mounting structure of a sensor unit), 32 sensor terminal (example of sensor unit), 40 holder unit, 42 mounting member, 44 pressing member, 52 holder body, 53 bottom (example of end), 53A bottom surface, 53B lower surface, 53C taper surface, 54 magnet, 54A upper surface , 54B lower surface, 55 side wall, 55A upper surface, 55B taper surface, 5C inner wall surface, 55D outer wall surface, 56 screw members, 57 storage chamber, 58 spacer, 58A upper surface, 58B lower surface, 62 female screw portion, 64 cutout portion, 64A facing surface, 64B facing surface, 64C curved surface, 66 operating portion, 66A Cut surface, 67 shaft portion, 67A lower surface, 68 male screw portion, 70 mounting structure (example of sensor mounting structure of sensor unit), 72 holder body, 74 set screw (example of coupling portion), 76 screw hole, 78 screw hole (An example of a part to be joined), 80 mounting structure (an example of a sensor mounting structure of the sensor unit), 90 holder unit, 92 mounting member, 94 holder body, 96 side wall, 96A end face, 97 adhesive, 98 storage chamber, 100 mounting Structure (example of sensor mounting structure of sensor unit), 102 adhesive, 110 mounting structure (sensor of sensor unit) Attachment structure), 112 adhesive pad, 120 attachment structure (example of sensor attachment structure of sensor unit), 122 weld nut, 124 shaft, 130 attachment structure (example of sensor attachment structure of sensor unit), 140 holder unit, 142 mounting member, 143 recess, 144 pressing member, 145 protrusion, 146 cover, 146A body, 146B knob, 146C protrusion, 146D engagement, 146E through hole, 147 vertical wall, 148 pin, 149 hinge Part, A explosion-proof area, B gap, C-axis (an example of a rotating shaft), D radial direction (an example of a cross direction), Z insertion / extraction direction

Claims (9)

A sensor that measures a measurement object disposed in an explosion-proof area and outputs measurement information, and includes a replaceable power supply unit, is connected to the sensor via wiring, and the measurement information is input from the sensor. Information input unit, and a sensor mounting structure of a sensor unit comprising:
An attachment member that includes a side wall that forms an accommodation chamber in which the sensor is accommodated, and is attached to the measurement target,
A pressing member that is movable in the insertion and removal direction of the sensor with respect to the storage chamber and presses the sensor stored in the storage chamber toward the measurement target,
Has,
The sensor of the sensor unit, wherein the side wall has a cut-out portion penetrated in a crossing direction intersecting the insertion / removal direction, the sensor is opened toward a side where the sensor is pulled out from the storage chamber, and the wiring is formed therethrough. Mounting structure.   The sensor mounting structure for a sensor unit according to claim 1, wherein the notch extends beyond a contact position between the pressing member and the sensor. A female screw portion is formed on the inner wall surface of the side wall,
The pressing member, an operation unit that is rotated around a rotation axis along the insertion and extraction direction of the sensor, and a shaft portion that extends from the operation unit in the insertion and extraction direction and applies a pressing force to the sensor, The sensor mounting structure for a sensor unit according to claim 1, further comprising a male screw portion formed on the shaft portion and screwed into the female screw portion.   4. The sensor mounting structure of the sensor unit according to claim 1, wherein an elastic modulus of a contact portion of the pressing member with the sensor is lower than an elastic modulus of the sensor. 5.   The sensor mounting structure of the sensor unit according to any one of claims 1 to 4, wherein the storage chamber has a flat bottom surface that contacts an end surface of the sensor.   6. A coupled part to which a coupling part provided on the object to be measured is coupled to an end of the attachment member on the side attached to the object to be measured. 2. A sensor mounting structure for the sensor unit according to claim 1.   7. The sensor mounting structure for a sensor unit according to claim 6, wherein a width of the coupled portion in a cross direction intersecting with the insertion / extraction direction of the sensor is smaller than a width of the sensor in the cross direction. The mounting member is a cylindrical body whose axial direction is the insertion / extraction direction,
The sensor mounting structure of the sensor unit according to claim 1, wherein the sensor is in contact with the measurement target.   The sensor mounting structure for a sensor unit according to any one of claims 1 to 8, wherein the sensor is a columnar acceleration sensor having the insertion / removal direction as a central axis direction.