JP2016197047A - Auscultation rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an auscultation rod that can conduct inspection free from the trouble of being caught by a rotational drive unit.SOLUTION: An auscultation rod comprises a columnar-shaped metal-made auscultation terminal 1 having a tapered tip 1a which is brought into contact with an examination object to detect its vibration sound, a plastic or stainless steel ear piece 2 to enable the examiner to listen to with his or her ear the detected vibration sound, and a metal-made conducting unit 3 whose two ends are connected to these auscultation terminal 1 and ear piece 2. The auscultation terminal 1 measures 12.5 mm or more in the length of the narrowest part of its section perpendicular to its center axis O, and the inclination angle of the tapering shape of the tapered tip 1a to its center axis O is not less than 40° but less than 90°.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an auscultation bar used for inspection of equipment, and more particularly to an auscultation bar for auscultating vibrations of rotating equipment.

  In factories that process ores such as smelters, many rotating devices such as conveyors, fans, pumps, cranes and the like having a rotary drive unit are used. In order to operate these rotating equipments stably, it is necessary to detect abnormalities of the rotating equipments at an early stage in routine inspections of facilities.

  In the cyclic inspection of rotating equipment, the presence or absence of abnormal vibration or abnormal heat is mainly inspected. In particular, for abnormal vibration, inspection is performed by auscultating the rotation drive unit using an auscultation stick. The auscultation bar is generally composed of a long and narrow bar, and its tip part (hereinafter also referred to as a terminal part) is brought into contact with the outer wall surface of the rotation drive part, which is an inspection object, and the ear is applied to the opposite end part. By virtue of this, it is possible to listen to the vibration sound generated in the rotation drive unit, and thereby to determine whether there is an abnormality in the device.

  For example, Patent Document 1 discloses an auscultation bar in which the tip of a columnar metal bar is chamfered and the metal is magnetized to improve the adhesion to the site to be inspected. Further, Patent Document 2 discloses an auscultation bar capable of illuminating a site to be inspected by combining a plurality of cylindrical metal bars in an extendable manner and providing a light emitter at the tip thereof.

  By the way, the equipment which has a rotation drive part often has a protective cover installed around the rotation drive part for the safety of the work of an inspector and the protection of equipment. In that case, considering that the human foot or finger does not touch the rotation drive unit, the protective cover is generally installed with the first characteristic number of the IP code in JIS C 0920 being 2 or more. Specifically, in the case of a rod-shaped body, if the diameter is 12.5 mm or more, it has a structure in which it cannot enter the rotation drive unit side through the gap of the protective cover.

JP 2006-038735 A JP 2012-208045 A

  However, as described above, even if a protective cover is attached so that a rod-like body having a diameter of 12.5 mm or more does not touch the rotation drive unit, in the case of a general auscultation rod, the terminal portion may accidentally touch the rotation drive unit. was there. If the terminal part touches the rotation drive part, not only the entire auscultation rod may be caught in the rotation drive part, but the rotation equipment may be damaged. There is a risk of adverse effects on equipment.

  The present invention has been made in view of such a conventional problem, and the inspection work is performed without causing a trouble that the first characteristic number of the IP code in JIS C 0920 is caught in the rotational drive unit protected by two or more standards. The aim is to provide a stethoscope that can be.

  In order to achieve the above object, an auscultation stick according to the present invention comprises a columnar metal auscultation terminal portion having a tapered tip portion that makes contact with an inspection object and detects vibration noise thereof, and the detected vibration. An auscultation stick comprising a plastic or stainless steel earpiece for listening to the sound by applying ears, and a metal conductive part connected at both ends to the auscultation terminal and the earpiece, respectively. The length of the narrowest portion of the terminal portion in the cross section perpendicular to the central axis is 12.5 mm or more, and the tapered inclined surface of the tip portion has an inclination angle of 40 ° or more and less than 90 ° with respect to the central axis. It is characterized by being.

  According to the present invention, it is possible to inspect the rotary drive unit without causing a trouble that the first characteristic number of the IP code in JIS C 0920 is caught in the rotary drive unit protected by two or more standards.

It is a side view which shows one specific example of the auscultation stick concerning this invention. It is a side view of the auscultation terminal part which the auscultation stick of FIG. 1 has. It is a side view of the cone-shaped front-end | tip part which the auscultation terminal part of FIG. 2 has.

  Hereinafter, an auscultation stick according to a specific example of the present invention will be described with reference to FIG. The auscultation stick according to one specific example of the present invention includes a metal auscultation terminal unit 1 that is brought into contact with the outer wall surface of rotating equipment to be inspected, and a user touching the ear to detect the auscultation terminal unit 1. The ear rest 2 for listening to the vibration sound of the rotating equipment, and both ends of the auscultation terminal section 1 and the ear covering section 2 to transmit the vibration sound of the rotating equipment detected by the auscultation terminal section 1 to the ear rest section 2. It is comprised from the metal conduction | electrical_connection part 3 which the part connects.

  More specifically, each auscultation terminal portion 1 is formed of a solid cylindrical member as shown in FIG. 2 and has an outer diameter of 12.5 mm or more, preferably 15 mm or more. As a result, the auscultation terminal portion 1 cannot enter from the gap of the protective cover in accordance with a standard in which the first characteristic number of the IP code in JIS C 0920 is 2 or more. The upper limit of the outer diameter of the auscultation terminal portion 1 is not particularly limited, but if it is too large, it is inconvenient to handle, and is usually about 25 to 30 mm. For the same simple handling reason, the length from end to end of the auscultation terminal portion 1 is preferably about 20 to 50 mm, and more preferably about 25 to 30 mm.

  In addition, in the auscultation stick of one specific example of the present invention shown in FIG. 2, the auscultation terminal portion 1 is constituted by a cylindrical member. However, the auscultation terminal portion 1 may be a prism such as a quadrangular prism or a hexagonal prism. In order to make the first characteristic number of the IP code in JIS C 0920 conform to a standard of 2 or more, the length of the narrowest portion in the cross section perpendicular to the central axis of the auscultation terminal portion 1 is 12.5 mm or more. And is preferably 15 mm or more.

  The distal end portion 1a of the auscultation terminal portion 1 has a conical shape, so that it can reliably contact the outer wall surface of the device to be inspected and accurately detect the vibration sound. As shown in FIG. 3, the tapered tip portion 1a has an inclination angle θ of the inclined surface with respect to the central axis O of 40 ° or more and less than 90 °. In particular, when the tapered shape is a conical shape, the distance between the cross section perpendicular to the central axis O and having a diameter of 12.5 mm and the top of the conical shape is in the range of 4 to 8 mm. This facilitates the handling of the auscultation bar. The upper limit of the inclination angle θ is preferably 60 ° or less, which makes the auscultation work easier. Further, the shape of the tip 1a may be a conical shape, a dome shape, a truncated cone shape, a pyramid shape such as a triangular pyramid or a quadrangular pyramid or a truncated cone shape such as a truncated pyramid shape.

  In the auscultation rod according to one specific example of the present invention, the connection portion 1b of the auscultation terminal portion 1 and the conductive portion 3 located on the opposite side of the distal end portion 1a is also tapered. In particular, the connecting portion 1b has a truncated conical shape in which the top portion is cut off by a plane perpendicular to the central axis O, and a double nut (to be described later) abuts on the end surface formed thereby. A female screw portion is threaded at the center of the end face, and a male screw portion at one end of the conductive portion 3 is screwed into the female screw portion. The reason why the connecting portion 1b is also tapered as described above is that the auscultation terminal portion 1 is less likely to be caught by the electrical wiring around the inspection portion during use, and is easy to handle, and the detected vibration sound is applied to the ear fitting portion 2. This is because the outer diameter of the metallic conductive portion 3 to be transmitted can be reduced and the weight of the conductive portion 3 can be reduced.

  The metal that is the material of the conductive portion 3 is preferably stainless steel. The reason for this is that, in a factory where a device with heat treatment such as a dry smelter is installed, the inspection place of the equipment may be in a very high temperature atmosphere, and the conductive part 3 that is a part that the user has in hand. This is because the heat conduction from the auscultation terminal portion 1 can be suppressed to prevent the conductive portion 3 or the ear contact portion 2 touched by the worker from becoming high temperature by using stainless steel having a low thermal conductivity. Among stainless steels, SUS304 is particularly preferable. This is because SUS304 has a thermal conductivity of about one-third that of SS400, which is a general carbon steel, and is readily available and easy to process.

  As for the auscultation stick of one specific example of this invention, as shown in FIG. 1, it is preferable that the conduction | electrical_connection part 3 is formed with the linear rod-shaped member, and the diameter is 3-8 mm and length is 400-800 mm. . Thereby, an auscultation stick can be made into the elongate structure about 450-900 mm in total length, and can be easily accommodated or carried. As shown by a two-dot chain line in FIG. 1, the conductive portion 3 may be bent within a range of 10 to 30 ° at a position of ¼ to / of the total length of the auscultation rod from the distal end portion 1 a. Thereby, it is possible to auscultate by touching the ear pad 2 against the ear while visually checking the position of the inspection site.

  On the inclined surface of the distal end portion 1a of the auscultation terminal portion 1, one or more grooves 1c having a depth of 0.5 to 1.0 mm centering on the top of the tapered distal end portion 1a are concentrically or spirally formed. Preferably it is formed. As a result, the tip 1a is less likely to slip when the tip 1a is in contact with the outer wall surface of the rotation drive unit for auscultation check, and auscultation can be performed more reliably. FIG. 2 shows a case where three grooves 1c are formed concentrically around the top. The width of the groove 1c is not particularly limited, but is preferably about 0.5 to 1.0 mm, which is equivalent to the depth of the groove 1c, because it can be easily formed.

  It is preferable that the earpiece 2 is composed of a solid spherical member having a diameter of 25 to 35 mm. The material of the ear cover 2 may be plastic or stainless steel. Of these materials, plastic is more preferable. The reason is that the ear pad 2 that directly touches the human body, particularly the soft skin of the head, preferably has lower heat conduction than the conductive portion 3. For example, in the case of polypropylene which is a general plastic, the thermal conductivity is about 1 / 100th of that of SS400.

  Both ends of the conductive portion 3 are formed with male screw portions, and the female screw portions of the auscultation terminal portion 1 and the ear fitting portion 2 are screwed into these male screw portions, respectively. Since the conductive portion 3 is made of a metal rod-shaped member, it is easy to perform male screw processing on both ends thereof. Moreover, it is easy to perform female threading on the auscultation terminal portion 1 made of a columnar member, and female threading can be easily performed if the earrest portion 2 is also a spherical member.

  As shown in FIG. 1, it is preferable that two pairs of double nuts 4 which are in contact with the auscultation terminal portion 1 and the ear fitting portion 2 are screwed into the male screw portions at both ends of the conductive portion 3. By tightening with the double nut in this way, the screwed part of the auscultation terminal part 1 and the conductive part 3 and the screwed part of the ear-fitting part 2 and the conductive part 3 are subjected to vibration during inspection of the rotary drive part and loosen. It can be prevented from becoming easy.

  By configuring the auscultation bar with the auscultation terminal part 1, the ear pad 2 and the conduction part 3 described above, the weight of the entire auscultation bar can be reduced to 50 to 400 g, and a lightweight auscultation bar that can be easily handled can be obtained. And if it is this auscultation stick, the trouble by which the 1st characteristic number of the IP code in JIS C 0920 is caught in the rotation drive part protected by the reference | standard of 2 or more can be prevented.

DESCRIPTION OF SYMBOLS 1 Auscultation terminal part 1a Tip part 1b Connection part 1c Groove 2 Earrest part 3 Conductive part 4 Double nut O Center axis

Claims (9)

A columnar metal auscultation terminal portion having a tapered tip that makes contact with an inspection object and detects the vibration sound, and a plastic or stainless ear that listens to the detected vibration sound by touching the ear A stethoscope consisting of a contact part and a metal conductive part connected to each of the auscultation terminal part and the ear contact part at both ends,
The length of the narrowest portion of the auscultation terminal portion in the cross section perpendicular to the central axis is 12.5 mm or more, and the tapered inclined surface of the tip portion has an inclination angle of 40 ° or more with respect to the central axis. Auscultation stick characterized by less than °.   The auscultation according to claim 1, wherein the tapered shape is a conical shape, and the distance between the cross section perpendicular to the central axis and having a diameter of 12.5 mm and the top of the conical shape is 4 to 8 mm. rod.   The auscultation bar according to claim 1 or 2, wherein the earpiece is made of a spherical member having a diameter of 25 to 35 mm, and the conductive part is made of a rod-like member having a diameter of 3 to 8 mm and a length of 400 to 800 mm. .   The auscultation stick according to any one of claims 1 to 3, wherein a total weight of the auscultation terminal part, the ear pad part, and the conduction part is 50 to 400 g.   The conductive portion is bent in a range of 10 to 30 ° at a position of ¼ to ３ of the total length of the auscultation stick from the top of the tip portion. The auscultation stick according to item 1.   The both ends of the conductive portion are formed with male screw portions, and the female screw portions of the auscultation terminal portion and the ear fitting portion are respectively screwed into the both male screw portions. The auscultation stick according to any one of 5.   The auscultation bar according to claim 6, wherein the two male screw parts are screwed with two pairs of double nuts that respectively contact the auscultation terminal part and the ear pad part.   The auscultation stick according to any one of claims 1 to 7, wherein the conductive portion is made of stainless steel. 9. The groove according to claim 1, wherein a groove having a depth of 0.5 to 1.0 mm is formed concentrically or spirally around the top of the tip on the inclined surface of the tip. The auscultation stick according to claim 1.

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