JP2016065554A - Sensor fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a holding position of a holding member to be adjusted while holding a contact angle of a sensor against an item to be measured.SOLUTION: A sensor fixture 10 is used for contacting and fixing a sensor device 1 having a casing 2a formed with male thread part 2b at its outer peripheral surface to an item to be measured at an extremity end 2c of the casing 2a. The sensor fixture 10 comprises a holding member 11 having an insertion hole 12 formed to be larger than an outer shape of the casing 2a into which the casing 2a is inserted; a seat nut 40 having a spherical surface part 41 at one side and the spherical surface part 41 is engaged in thread with an inner edge 13 of the insertion hole 12 at a part of the extremity end 2c rather than the holding member 11 at the casing 2a; and a pair of holding members 21, 25 rotatably connected to both ends of the holding member 11 so as to hold the item to be measured and to push the casing 2a against the item to be measured through the holding member 11 and the seat nut 40.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a sensor fixing device that fixes a sensor in contact with an object to be measured.

  For example, Patent Document 1 discloses a fixing device that fixes a sensor in contact with an object to be measured. This fixture includes a holding member to which a sensor is attached and a holding member that holds an object to be measured (an inlet portion of a steam trap) with the holding member. The sensor is attached to the connecting hole of the holding member by screwing. And a sensor is fixed in the state where the front-end | tip of a sensor contacted the measuring object by pinching a measuring object with the holding member and holding member to which the sensor was attached.

JP 2013-170686 A

  By the way, in the fixing device as described above, there is a possibility that the sensor is fixed while being inclined with respect to the contact surface of the measurement object. That is, when the measurement object is, for example, a polygonal pipe, it may be necessary to shift the position of the clamping member to an appropriate position that can be firmly clamped. However, if the position of the clamping member is shifted, the position of the sensor is also shifted, and the contact angle of the sensor with respect to the measurement object may change. When the contact angle of the sensor changes, there is a problem that the detection accuracy of the sensor is impaired.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a sensor fixture that can adjust the clamping position of a clamping member while maintaining the contact angle of the sensor with respect to the measurement object.

  The present invention is directed to a sensor fixing device that fixes a sensor having a columnar casing by bringing the tip of the casing into contact with an object to be measured. The sensor fixing device according to the present invention includes a holding member, a contact member, and a pair of clamping members. The holding member is formed larger than the outer shape of the casing and has an insertion hole into which the casing is inserted. The contact member is formed in a spherical shape on one side, and is provided on the outer periphery of a portion of the casing inserted into the insertion hole on the tip side of the holding member so that the spherical surface is in contact with the inner edge of the insertion hole. It is what The pair of holding members are rotatably connected to both ends of the holding member, hold the measurement object, and press the tip of the casing against the measurement object via the holding member and the contact member. Is.

  According to the present invention, one side is formed in a spherical shape, and the spherical surface is in contact with the inner edge of the insertion hole on the outer periphery of the tip side (that is, the measurement object side) of the holding member in the casing inserted into the insertion hole. A contact member provided in a state is provided. That is, the holding member is not connected to the casing of the sensor and is supported by the spherical surface of the contact member. Moreover, the insertion hole of the holding member is formed larger than the outer shape of the casing. Therefore, as shown in FIG. 3, when the holding member is shifted to an appropriate position, the holding member connected to the holding member is also displaced. At this time, the holding member moves only on the spherical surface of the abutting member. The casing and the abutment member do not move. Therefore, the contact angle of the sensor with respect to the measurement object is kept unchanged. As described above, it is possible to adjust the clamping position of the clamping member while maintaining the contact angle of the sensor with respect to the measurement object.

FIG. 1 is a front view showing a schematic configuration of a sensor fixing device according to an embodiment together with a sensor device. FIG. 2 is an enlarged front view showing the sensor fixing device according to the embodiment. FIG. 3 is an enlarged front view showing the sensor fixing device according to the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

  As shown in FIG. 1, the sensor fixing device 10 of the present embodiment is configured to fix the sensor device 1 in contact with a measurement object. In this embodiment, the measurement object is the inlet 9 of the steam trap.

  The sensor device 1 is fixed to the inlet portion 9 in a state extending in the up-down direction, for example. The sensor device 1 includes a sensor main body 2, an antenna 3, and a connection shaft 4. The connection shaft 4 is a hollow shaft, and both ends are connected to the sensor body 2 and the antenna 3 by nuts 5 and 6. The sensor body 2 has a substantially cylindrical casing 2 a and detects the vibration and temperature of the inlet portion 9 by contacting the inlet portion 9. Although not shown, the antenna 3 includes a signal processing circuit and a transmitter, and transmits a signal related to vibration and temperature of the measurement object detected by the sensor body 2.

  As shown in FIG. 2, the sensor fixing device 10 includes a holding member 11, a pair of clamping members 21 and 25, and a tightening member 35.

  The holding member 11 is a member extending left and right in FIG. 2, and both end portions are slightly bent downward. One insertion hole 12 is formed in the center of the holding member 11, and the casing 2 a of the sensor body 2 is inserted into the insertion hole 12. A male screw portion 2b is formed on the outer peripheral surface of the casing 2a. The insertion hole 12 has an inner diameter larger than the outer diameter (outer shape) of the casing 2a. The holding member 11 is produced by, for example, cutting out aluminum or aluminum die casting.

  The pair of sandwiching members 21 and 25 are respectively produced by stacking two thin plates (for example, made of stainless steel) at intervals. 1 to 3 show only one plate. The pair of clamping members 21 and 25 are formed in a substantially S-shape that is symmetrical to the left and right. Specifically, the clamping members 21 and 25 have first curved portions 22 and 26 and second curved portions 23 and 27, respectively, and the first curved portions 22 and 26 and the second curved portions 23 and 27 are connected to each other. Protrusions 24 and 28 are provided at the cut-back portion between them. The protrusions 24 and 28 are formed at positions slightly lower than the central portions of the sandwiching members 21 and 25 and protrude toward the inlet portion 9 that is a measurement object. One end (upper end) of each of the holding members 21 and 25 is connected (coupled) to both ends of the holding member 11 so as to be rotatable by a rivet 14. The clamping members 21 and 25 clamp the inlet portion 9 from its left and right. In other words, the clamping members 21 and 25 are clamped with the projections 24 and 28 in contact with the left and right of the inlet portion 9.

  A clamping member 35 is provided at the other end (lower end) of the clamping members 21 and 25. The fastening member 35 connects the pair of clamping members 21 and 25 and tightens them in the clamping direction. The tightening member 35 has a bolt 36 and a nut 38. In addition, connecting plates 31 and 32 for connecting two thin plates are provided at the other ends (lower ends) of the clamping members 21 and 25. The other ends of the holding members 21 and 25 are connected by inserting bolts 36 into the through holes of the connecting plates 31 and 32 and fixing them with nuts 38. That is, the clamping members 21 and 25 are displaced in the clamping direction by tightening the nut 38.

  The head 37 of the bolt 36 is formed in a conical shape. Moreover, what is called a ball seat nut is used for the nut 38, Therefore, a contact area with the connection board 32 can be made larger than a plane seat nut. Therefore, the other ends of the clamping members 21 and 25 can be tightened more firmly.

  Furthermore, the sensor fixing device 10 of the present embodiment includes a seat nut 40 that is screwed into the male screw portion 2b of the casing 2a. The seat nut 40 has a spherical portion 41 formed on one side in a spherical shape, and constitutes a contact member according to the present invention. The seat nut 40 is screwed (provided) to the outer periphery of the portion of the casing 2a that is inserted into the insertion hole 12 of the holding member 11 on the tip 2c side (that is, the inlet 9 side) with respect to the holding member 11. The seat nut 40 is screwed into a position where the spherical portion 41 (spherical surface) is in contact with the lower inner edge portion 13 of the insertion hole 12. That is, the seat nut 40 is screwed into a position in contact with the inner edge portion 13 of the insertion hole 12 in the casing 2 a in a state where the tip 2 c of the casing 2 a inserted into the insertion hole 12 is in contact with the inlet portion 9.

  In the sensor fixing device 10 of the present embodiment, the other end (lower end) of the clamping members 21 and 25 is clamped by the clamping member 35 so that the clamping members 21 and 25 clamp the inlet portion 9 from the left and right. The holding member 11 presses the seat nut 40 toward the inlet portion 9 by the clamping operation 25. Thereby, the front-end | tip 2c of the casing 2a is pressed against the surface of the inlet part 9, and is fixed. That is, the clamping members 21 and 25 perform a clamping operation for clamping the inlet portion 9, and press the tip 2 c of the casing 2 a against the inlet portion 9 through the holding member 11 and the seat nut 40 in accordance with the clamping operation. The sensor body 2 detects the vibration and temperature of the inlet portion 9 when the tip 2c of the casing 2a contacts the inlet portion 9.

  Here, as shown in FIG. 3, for example, when the outer shape of the inlet portion 9 is asymmetric, the clamping position of the clamping members 21 and 25 (that is, the contact position of the protrusions 24 and 28 of the clamping members 21 and 25). Needs to be shifted to a position where it can be firmly clamped. That is, it is necessary to adjust (finely adjust) the positions of the clamping members 21 and 25 to appropriate positions. When the holding members 21 and 25 are shifted in the circumferential direction of the inlet portion 9 (shifted counterclockwise in this embodiment), the holding member 11 connected to the holding members 21 and 25 is similarly shifted. At that time, the holding member 11 moves on the spherical surface portion 41 of the seat nut 40, while the casing 2a (sensor device 1) and the seat nut 40 do not move. That is, the holding member 11 can move by the gap between the insertion hole 12 and the casing 2a, and the casing 2a and the seat nut 40 do not move as long as the holding member 11 moves below the gap. Further, since the holding member 11 is in contact with the spherical surface portion 41 of the seat nut 40 even if it moves, the tip 2c of the casing 2a is pressed against the surface of the inlet portion 9 and held in a fixed state. Thus, even if the clamping positions of the clamping members 21 and 25 are adjusted, the casing 2a does not move, so the contact angle of the casing 2a with respect to the inlet portion 9 is maintained.

  As described above, according to the sensor fixing device 10 of the above embodiment, the insertion hole 12 into which the casing 2a is inserted in the holding member 11 is formed larger than the outer diameter of the casing 2a, and the spherical portion 41 is provided on one side. In addition, a seat nut 40 is provided at a portion of the casing 2a closer to the distal end 2c than the holding member 11 so that the spherical portion 41 is screwed in a state of being in contact with the inner edge portion 13 of the insertion hole 12. Therefore, the clamping positions of the clamping members 21 and 25 can be shifted without moving (displacement) the casing 2a. Therefore, it is possible to adjust the clamping positions of the clamping members 21 and 25 while maintaining the contact angle of the casing 2a (sensor device 1) with respect to the inlet 9 that is the measurement object. Therefore, it can prevent that the detection accuracy of the sensor apparatus 1 is impaired.

  Further, in the sensor fixing device 10 of the above-described embodiment, since the first curved portions 22 and 26 projecting outward are provided in the clamping members 21 and 25, the diameter of the inlet portion 9 can be widely handled.

  In addition, although the said embodiment demonstrated what the casing 2a of the sensor main body 2 was formed in the substantially cylindrical shape, the casing 2a may be formed in the prism etc. in this invention.

  In the above embodiment, the contact member (seat nut 40) is fixed to the outer periphery of the casing 2a by screwing. However, in the present invention, the contact member is fixed to the outer periphery of the casing 2a by welding or the like. Alternatively, the contact member (contact portion) may be integrally formed on the outer periphery of the casing 2a.

  The present invention is useful for a sensor fixing device that fixes a sensor in contact with an object to be measured.

DESCRIPTION OF SYMBOLS 1 Sensor apparatus 2a Casing 2b Male thread part 2c Tip 9 Inlet part (measuring object)
DESCRIPTION OF SYMBOLS 10 Sensor fixing tool 11 Holding member 12 Insertion hole 13 Inner edge parts 21 and 25 Clamping member 40 Seat nut (contact member)
41 Spherical surface (spherical surface)

Claims (2)

A sensor fixing device for fixing a sensor having a columnar casing by bringing the tip of the casing into contact with an object to be measured,
A holding member having an insertion hole that is formed larger than the outer shape of the casing and into which the casing is inserted;
A contact member having a spherical surface on one side and provided on the outer periphery of the distal end side portion of the casing inserted into the insertion hole so that the spherical surface is in contact with the inner edge of the insertion hole;
A pair of holding members which are rotatably connected to both ends of the holding member, hold the measurement object, and press the tip of the casing against the measurement object via the holding member and the contact member; The sensor fixing device characterized by the above-mentioned. The sensor fixture according to claim 1,
The casing is formed in a cylindrical shape in which an external thread portion is formed on the outer peripheral surface,
The sensor fixing instrument, wherein the contact member is a seat nut screwed onto an outer periphery of the casing.

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