JP2015140898A - Sensor fixing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor fixing tool for improving a fastening work efficiency in which a nut is fastened to a U-bolt.SOLUTION: A sensor fixing tool 10 comprises: a holding member 20 to which a sensor 1 is fixed; U-bolt 40 having two legs 41 inserted into insertion holes 24 of the holding member 20; and nuts 50 fixed to both legs 41 of the U-bolt 40. The nut 50 is constituted by a barrel part 52 formed like a column shape and inserted into the insertion hole 24 of the holding member 20, and an upper part 51 and a lower part 53 that are continuously formed at both ends of the barrel part 52 and formed to be larger than the insertion hole 24 of the holding member 20 as seen at a top plan view, it passes through the upper part 51, barrel part 52 and lower part 53, and further a through-pass hole 54 having a thread 54a at its inner circumferential surface is formed.

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. In this fixing device, a holding member to which a sensor is attached and a holding member located on the opposite side of the holding member across the measurement object (steam trap inlet) are fixed to the measurement object with U-bolts and nuts. ing. The side wall of the holding member is provided with a notch that allows the U-bolt insertion hole to communicate with the outside. In this fixing device, the leg portion of the U-bolt to which the holding member, the holding member, and the pair of nuts are attached is inserted into the insertion hole of the holding member through the notch portion. Therefore, after inserting the U bolt into the insertion holes of the holding member and the holding member, it is not necessary to attach the nut to the leg portion of the U bolt while supporting the U bolt. Thereby, the efficiency of tightening the nut to the U-bolt is improved.

JP 2013-170686 A

  By the way, in the fixing device disclosed in Patent Document 1, since the notch portion is provided in the holding member, the strength of the holding member may be reduced when an unexpected load is applied.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a sensor fixing device that can improve the efficiency of tightening a nut to a U-bolt without reducing the strength of the member.

  The sensor fixing device according to the present invention is provided with a pair of insertion holes, a holding member to which the sensor is attached to bring the sensor into contact with the measurement object, and the opposite side of the measurement object from the holding member. It is assumed that the U-bolt having two leg portions inserted into the pair of insertion holes of the holding member and a pair of nuts attached to both leg portions of the U-bolt. At least one of the nuts is formed in a columnar shape, and is formed continuously with a body part inserted into the insertion hole of the holding member and both ends of the body part, and the holding member is inserted in a plan view. An upper part and a lower part that are formed larger than the hole are formed, and a through-hole that penetrates the upper part, the body part, and the lower part in the axial direction of the body part and has a female screw part on the inner peripheral surface is formed.

  According to the present invention, at least one of the nuts is formed continuously from the body part inserted into the insertion hole of the holding member and both ends of the body part, and is larger than the insertion hole of the holding member in plan view. Since the upper part and the lower part are formed, the nut is held by the holding member. Therefore, since the nut can be attached to the U-bolt while the nut is held by the holding member, the efficiency of tightening the nut to the U-bolt is improved.

FIG. 1 is a cross-sectional view illustrating a schematic configuration of a sensor fixing device according to an embodiment. FIG. 2 is a perspective view showing a schematic configuration of the holding member. FIG. 3 is a perspective view showing a schematic configuration of the clamping member. FIG. 4 is a sectional view showing a schematic configuration of the nut.

  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.

  A sensor fixing device 10 according to the present embodiment shown in FIG. 1 fixes a sensor 1 such as a temperature sensor or a vibration sensor in contact with a measurement object. In the present embodiment, the measurement object is the inlet 5 of the steam trap.

  The sensor fixing device 10 includes a holding member 20, a clamping member 30, a U bolt 40, and a pair of nuts 50.

  As shown in FIG. 2, the holding member 20 has an upper wall 21 and two side walls 22, and has a substantially U-shaped cross section. In the center of the upper wall 21, one connection hole 23 having a female screw portion is formed. The sensor 1 is attached to the connection hole 23. Here, the sensor 1 will be described as a temperature sensor. The sensor 1 has a male screw portion 2 a formed on the outer peripheral surface of the casing 2, and the casing 2 is attached (fixed) by being screwed into the connecting hole 23 of the holding member 20. Further, a thermocouple 3 is provided at the front end of the casing 2, and the thermocouple 3 comes into contact with the inlet portion 5 of the steam trap by attaching the casing 2 to the holding member 20. In addition, a pair of elongated holes 24 are formed in the upper wall 21 on both sides of the connecting hole 23.

  As shown in FIG. 3, the clamping member 30 has an upper wall 31 and two side walls 32, and has a substantially U-shaped cross section. The clamping member 30 is located on the opposite side of the steam trap inlet 5 from the holding member 20. A seat surface 33 with which the surface of the inlet portion 5 comes into contact is formed at the center of the upper wall 31. The seat surface 33 is roughened by knurling. In addition, a pair of long insertion holes 34 are formed in the upper wall 31 on both sides of the seating surface 33.

  The U bolt 40 has two legs 41. The U bolt 40 is inserted into the insertion hole 24 of the holding member 20 after the two leg portions 41 are inserted into the insertion hole 34 of the clamping member 30 from the opposite side of the holding member 20 of the inlet portion 5 of the steam trap. .

The pair of nuts 50 are provided in the pair of insertion holes 24 of the holding member 20. As shown in FIG. 4, the nut 50 includes an upper part 51, a body part 52, and a lower part 53. 4 is a cross-sectional view as viewed from the right or left side in FIG.

The trunk | drum 52 is formed in a column shape, and the outer peripheral surface is bundled toward the shaft center. The body 52 is inserted into the insertion hole 24 of the holding member 20. The upper part 51 and the lower part 53 are formed continuously at both ends of the body part 52. And the upper part 51 and the lower part 53 are formed larger than the insertion hole 24 of the holding member 20 by planar view (viewing from the upper side in FIG. 4). Here, being larger than the insertion hole 24 means a size that does not enter the insertion hole 24. The upper portion 51 has a plan view shape, for example, a hexagon, and the lower portion 53 has a plan view shape, for example, a circle.

  The nut 50 is formed with a through hole 54 that penetrates the upper portion 51, the trunk portion 52, and the lower portion 53 in the axial direction of the trunk portion 52 (a central axial direction extending vertically in FIG. 4). In the through hole 54, an inner peripheral surface corresponding to the upper portion 51 is a female screw portion 54 a, and an inner peripheral surface corresponding to the trunk portion 52 and the lower portion 53 is a non-threaded portion 54 b. The non-threaded portion 54b is a simple hole in which no thread groove is formed.

  According to the above embodiment, the nut 50 is formed continuously from the body 52 to be inserted into the insertion hole 24 of the holding member 20 and both ends of the body 52, and the insertion hole of the holding member 20 in plan view. Since the upper portion 51 and the lower portion 53 are formed larger than 24, the nut 50 is held by the holding member 20. Therefore, since the nut 50 can be attached to the leg portion 41 of the U bolt 40 while the nut 50 is held by the holding member 20, the efficiency of tightening the nut 50 to the U bolt 40 is improved. For example, there is no risk of dropping the nut by mistake.

  Further, since the outer peripheral surface of the trunk portion 52 of the nut 50 is constricted toward the axial center, the frictional resistance (dynamic friction resistance) between the trunk portion 52 and the insertion hole 24 of the holding member 20 is reduced. Therefore, the nut 50 can be easily rotated, and therefore the tightening work efficiency of the nut 50 is further improved.

  The nut 50 is inserted into the insertion hole 24 by cutting the left and right ends (in FIG. 1) of the holding member 20. After the nut 50 is inserted, the cut left and right ends are joined by welding. For this reason, unnecessary notch portions are not formed in the holding member 20, and a decrease in strength can be avoided. Therefore, it is possible to improve the tightening work efficiency of the nut 50 without causing the strength of the holding member 20 to decrease.

  Further, the upper portion 51 of the nut 50 may be constituted by a quick nut (nut disclosed in Utility Model Registration No. 1397975). In that case, the integrally formed body portion 52 and lower portion 53 are joined to the lower surface of the quick nut. Since the quick nut is fastened simply by pushing the leg 41 of the U bolt 40, the nut 50 can be more easily attached to the U bolt 40, and the tightening efficiency of the nut 50 is further improved. Further, the quick nut may be used only for the upper portion 51 of one nut 50.

  In the above embodiment, only one of the pair of nuts 50 may be configured as described above, and the other may be a general nut larger than the insertion hole 24 of the holding member 20.

  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 10 Sensor fixing tool 20 Holding member 24 Insertion hole 40 U bolt 41 Leg part 50 Nut 51 Upper part 52 Body part 53 Lower part 54 Through-hole 54a Female thread part

Claims (2)

A pair of insertion holes are provided, a holding member for attaching the sensor to contact the measurement object, and a pair of insertion holes of the holding member from the side opposite to the holding member of the measurement object A sensor fixing device comprising a U-bolt having two legs to be inserted, and a pair of nuts attached to both legs of the U-bolt,
At least one of the nuts is formed in a cylindrical shape, and is formed continuously from a body part inserted into the insertion hole of the holding member and both ends of the body part, and from the insertion hole of the holding member in a plan view. The upper part and the lower part are formed in a large size, and the upper part, the trunk part, and the lower part are penetrated in the axial direction of the trunk part, and a through hole having a female screw part is formed on the inner peripheral surface. Sensor fixing device. The sensor fixture according to claim 1,
The upper part of the said at least 1 nut is comprised with the quick nut, The said trunk | drum is joined to the lower surface of this quick nut, The sensor fixing instrument characterized by the above-mentioned.

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