JPH0648324Y2 - Pipe joint angle measuring device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pipe joint angle measuring device that can be used for inspecting a deviation between a pipe axis and a pipe joint axis at a pipe joint.

PRIOR ART FIG. 9 is a sectional view of a pipe joint 2 implemented in connection with the present invention. A pipe 1 such as a gas supply pipe connected by a pipe joint 2 is inserted into the joint body 3. A pair of push wheels 4 are screwed onto both ends of the joint body 3. The joint body 3 is
Central hole 5 that penetrates in the direction of the axis l4 into which the end of the pipe 1 is inserted
Have. Expansion holes 6 having a diameter larger than that of the central hole 5 are formed inside both ends of the joint body 3. The central hole 5 and the expansion hole 6 are formed coaxially and are connected to each other by a conical inclined surface 7 having a large diameter toward the end of the joint body 3. The outer screw 8 of the push ring 4 is the inner screw 9 engraved on the inner peripheral surface of both ends of the joint body 3.
Screw into. A seal member 11 that abuts the inclined surface 7 is fitted into the expansion hole 6 of the joint body 3. The seal member 11 is made of an elastic material such as rubber, and is formed so that its outer peripheral surface is inclined so as to be parallel to the inclined surface 7, and its inner peripheral surface is equal to the outer diameter of the pipe 1. , Has a slightly larger inner diameter. The retainer 12 is in contact with the end surface of the seal member 11 facing the open end side of the joint body 3. The retainer 12 is made of a synthetic resin material, and the pressing force from the push ring 4 is a sealing member.
Communicate to 11.

In the pipe joint 2 having such a configuration, the axis of the pipe 1
It is desirable that l3 and the axis l4 of the joint body 3 be on a straight line, and even if they are deviated from each other, for example, at most 3
It is desirable to be within the degree. When the displacement angle S increases, the seal member 11 does not receive sufficient compressive stress necessary for sealing over the entire length in the circumferential direction when the push wheel 4 is tightened to the joint body 3 with a large torque. Occurs, and the airtightness decreases accordingly. Further, when the offset angle S is further large, a large stress locally acts on the seal member 11, and the life of the seal member 11 is shortened. Therefore, such an axis of the joint body 3
The angle S between l4 and the axis l3 of the tube 1 must be zero. Therefore, conventionally, an operator visually measures the deviation angle S after the connection work between the pipe 1 and the pipe joint 2 is completed. However, such visual inspection cannot accurately inspect the axis.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to provide a pipe joint angle measuring device capable of accurately measuring the deviation between the pipe joint axis and the pipe axis.

Means for Solving the Problems The present invention has a pair of abutting members which can be opened and closed by a hinge and can abut on an outer peripheral surface of a pipe along a pipe axis, and is fixed to one abutting member. And a measuring piece that protrudes in the pipe axis direction and a measuring piece that protrudes in the other contact member in the same direction as the reference piece protrudes and is displaceable along the pipe axis. Is an angle measuring device for a pipe joint.

According to the present invention, the abutment member abuts the pipe to be measured over the outer peripheral surface of the pipe, the reference piece abuts the end face of the pipe joint, and the measurement piece is the same as the end face of the pipe joint. It is mounted so as to abut the surface. In such a state, the measurement piece is displaced along the tube axis so as to come into contact with the end surface. This makes it possible to measure the shift angle corresponding to the amount of displacement of the measurement piece.

Embodiment FIG. 1 is a sectional view of an embodiment of the present invention. A pipe joint angle measuring device (hereinafter abbreviated as a measuring device) 20 is a pair of abutting members 22 that can be opened and closed by a hinge and can abut the outer peripheral surface of a pipe 21 along a pipe axis l2. , 23 and one of the contact members 22, 23 fixed to the contact member 22 and the pipe 21
Of the reference piece 24 protruding in the tube axis direction, and the other abutting member 23 is projected in the same direction as the reference piece 24 is protruding,
A measuring piece 25 which is displaceable along the tube axis of the tube 21. The end of the pipe 21 on which such a measuring device 20 is mounted has a pipe joint 26
Has been inserted into.

At both ends of the joint body 27 of this pipe joint 26, a pair of push wheels
28 is screwed. The joint body 27 has a central hole 29 penetrating in the direction of the axis l2 into which the end of the pipe 21 is inserted. Expanding holes 30 having a larger diameter than the central hole 29 are formed inside both ends of the joint body 27. The center hole 29 and the expansion hole 30 are formed coaxially and are connected to each other by a conical inclined surface 31 that has a large diameter toward the end of the joint body 27. The external thread 32 of the push ring 28 is screwed into the internal thread 33 engraved on the inner peripheral surfaces of both ends of the joint body 27. Fitting body 27
A seal member 34, which abuts the inclined surface 31, is fitted into the expansion hole 30 of FIG. The seal member 34 is made of an elastic material such as rubber, and is formed so that its outer peripheral surface is inclined so as to be parallel to the inclined surface 31, and its inner peripheral surface is equal to the outer diameter of the pipe 21. , Has a slightly larger inner diameter. The retainer 35 is in contact with the end surface of the seal member 34 facing the open end side of the joint body 27. The retainer 35 is made of a synthetic resin material and transmits the pressing force from the push ring 28 to the seal member 34. The axis 1 of the pipe joint 26 and the axis l2 of the pipe 21 are connected to each other at an angle of θ so that they are displaced from each other. End face 36 of push ring 28
Lies in a plane perpendicular to the axis 1 of the pipe fitting 26.

2 is a side view of the pipe joint angle measuring device 20 as seen from the arrow A side in FIG. 1, FIG. 3 is a plan view thereof, and FIG.
The figure is a perspective view thereof. The contact member 22 has a substantially V-shaped contact portion 37a and a connecting portion 38a connected to the contact portion 37a. The abutting portion 37a has abutting surfaces 39a, 40a, 41a, 42a that abut the outer peripheral surface of the tube 21 in a state where the measuring device 20 is mounted on the tube 21, and these abutting surfaces 39a, 40a, When 41a and 42a are in contact with the outer peripheral surface of the pipe 21, the reference piece 24 is parallel to the axis l2 of the pipe 21.

A pair of brackets 43a, 44a and a notch 45a interposed between the brackets 43a, 44a are formed in the connecting portion 38a, and pin holes are formed in the brackets 43a, 44a, respectively. The structure of the abutting member 22 as described above is similar to the abutting member 23, and the corresponding portions are denoted by the subscript b.

A hinge pin 46 is attached to the contact members 22 and 23 to the bracket 43.
a, 43b; 44a, 44b. A coil spring 49 is attached to a portion of the hinge pin 46 exposed from the notch 45b. One end of the coil spring 49 is brought into contact with the outer surface of the connecting portion 38a to be locked, and the other end thereof is connected to the connecting portion 38b. Is abutted against the outer surface of and locked. Snap rings 50 and 51 are attached to both ends of the hinge pin 46, whereby the hinge pin 46 is prevented from being pulled out. Abutting members connected in this way
The abutting member 23 and the abutting member 23 are spring-biased in a direction in which they approach each other around the axis of the hinge pin 46, and abutting surfaces 39a to 42a; 39b to 42b are attached to the various tubes 21 having different outer diameters. Abuts on the outer peripheral surface of the pipe 21 and stabilizes the axis without rattling.
It can be mounted parallel to l2.

FIG. 5 shows the mounting seat 52 of the contact member 23 to which the measuring piece 25 is mounted.
6 is a cross-sectional view of the vicinity thereof, FIG. 6 is a plan view seen from the arrow B side of FIG. 5, and FIG. 7 is a cross-sectional view seen from the section line VII-VII of FIG. The measuring piece 25 has a flat plate-shaped mounting portion 53.
And a stopper 54 protruding from one end of the mounting portion 53,
The mounting portion 53 has a substantially V-shaped bent portion 55 that is continuous with the end portion on the opposite side of the stopper 54. The bent portion 55 is formed with an abutting surface 56 that abuts the end surface 36 (see FIGS. 1 and 3) of the push wheel 28 described above. When the measuring piece 25 is moved in the arrow C1 direction, the contact surface 58 contacts the end surface 57 of the mounting seat 52 in a state of being displaced to the position indicated by the imaginary line 25a, and the displacement of the measuring piece 25 is blocked. It Also, when the measuring piece 25 is moved in the direction of arrow C2, the mounting seat 5 is displaced in the position indicated by the imaginary line 25b.
The contact surface 61 of the stopper 54 comes into contact with the second end surface 60, and the displacement of the measuring piece 25 is prevented. With such a measuring piece 25 fitted in the guide groove 62 of the mounting seat 52, the mounting portion 53 is movably held by the holding plate 70 along the guide groove 62. The mounting seat 52 has a screw hole with an internal thread engraved on the inner peripheral surface.
63 is formed, and a bolt 64 is screwed into the screw hole 63. On the side of the screw hole 63 facing the guide groove 62, the screw hole
A recess 65 having an inner diameter larger than the inner diameter of 63 is formed,
A pair of pressing pieces 66 are housed in the recess 65 and the screw hole 63. The pressing piece 66 is a flange that fits in the recess 65.
66a and a shaft 66b fixed to the flange 66a.
A compression spring 67 is attached to the. One end of the compression spring 67 is in contact with the bolt 64 and the other end is in contact with the flange 66a. Thereby, the pressing piece 66 elastically abuts the mounting portion 53, and is not displaced undesirably by its own weight when the measuring piece 25 is tilted at the time of measurement, and at a desired position. It can be stopped. The mounting portion 53 of the measuring piece 25 is provided with graduations M at equal intervals along the longitudinal direction. The scale M faces the outside through a long hole 71 formed in the holding plate 70.

FIG. 8 shows the mounting seat 72 of the contact member 22 to which the reference piece 24 is mounted.
FIG. The reference piece 24 is a flat plate-shaped mounting portion 73.
And a bent portion 74 connected to the mounting portion 73. Bent part
At 74, the end face 36 of the push wheel 28 (see FIGS. 1 and 3)
An abutment surface 75 is formed which abuts against. A guide slot 76 extending in the longitudinal direction is formed in the mounting portion 73. The mounting seat 72 is formed with a screw hole 77 having an inner thread engraved on its inner peripheral surface. A bolt 78 is screwed into the threaded hole 77 through the guide elongated hole 76, and thus the reference piece 24 is fixed to the mounting seat 72. The reference piece 24 is preliminarily adjusted such that the contact surface 56 and the contact surface 75 are in a plane perpendicular to the tube axis 12 when the scale M of the measurement piece 25 is zero.

Next, the operation of the measuring device 20 having the above-mentioned configuration will be described. First, in the first step, the measuring device 20 is connected to the pipe 21.
Mounted near the pipe joint 26, and the measurement piece 25 is pulled out in the direction of arrow C2 until the stopper 54 abuts the end surface 60 (the state shown by the phantom line 25b in FIG. 5). In the second step, the reference piece 24
And the contact surfaces 56, 75 of the measuring piece 25 contact the end surface 36 of the push wheel 28, and the contact surfaces 39a-42a; 39b-4 of the contact members 22, 23.
The measuring device 20 is moved along the pipe axis in the direction of approaching the push wheel 28 so that the 2b is in contact with the outer peripheral surface of the pipe 21, and the scale M is read at the third step. Next, in the fourth step, the measuring operation from the first step to the third step is performed from the state shown in FIG. 2 at a position where the measuring device 20 is shifted by 90 degrees around the axis l2 of the tube 21. The measured value of the graduation M thus read can be obtained by using a conversion table prepared in advance and the shift angle θ corresponding to the measured value can be obtained. Alternatively, the calculation may be performed using the following first formula.

Here, θ: deviation angle L: graduation measurement value D: distance between reference piece and measurement piece (≈ outer diameter of tube 21) According to the measuring device 20 of the present invention, the measurement location is the vertical hole. Even in a relatively narrow space such as inside, it is possible to easily measure by mounting on a pipe. Further, even when the measurement location is dark, the pressing piece 66 is configured to frictionally contact the measuring piece 25, so that the measuring device 20 can be moved from the pipe 21 without moving the graduated scale. The scale M can be read in a bright place by removing it. Further, in the above-described embodiment, the measurement position is shifted by 90 degrees around the axis of the pipe, but the measurement at the position shifted by 90 degrees is repeated two to three times, More accurate measurement can be performed.

Effect According to the present invention, the deviation angle can be measured much more accurately and easily than in the prior art, so that the axis of the pipe and the axis of the pipe joint are substantially coaxial based on the measured value. It is possible to make an accurate connection. As a result, the seal member of the pipe joint can be tightened so that uniform stress is generated, and reliable airtightness can be achieved. In addition, since even stress is generated in such a seal member, deformation of the seal member due to local stress does not occur, the life of the seal member can be extended, and the number of replacements can be reduced. The economy is improved.

[Brief description of drawings]

1 is a sectional view of an embodiment of the present invention, FIG. 2 is a side view of a pipe joint angle measuring device 20 as seen from the arrow A side of FIG. 1, FIG. 3 is its plan view, and FIG. FIG. 5 is a perspective view thereof, and FIG. 5 is a cross-sectional view of the contact member 23 on which the measuring piece 25 is mounted, in the vicinity of a mounting seat,
6 is a plan view seen from the arrow B side in FIG. 5, FIG. 7 is a sectional view taken along the section line VII-VII in FIG. 6, and FIG. FIG. 9 is a sectional view of the contact member 22 near the mounting seat 72, and FIG. 9 is a sectional view of the pipe joint 2 implemented in connection with the present invention. 20 …… Piping angle measuring device, 21 …… Pipe, 22,23 …… Abutting member, 24 …… Reference piece, 25 …… Measuring piece, 26 …… Pipe fitting,
27 …… Fitting body, 28 …… Push ring, 1 …… Pipe joint 26 axis, l2 …… Pipe 21 axis, θ …… Deviation angle

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Masafumi Kinoshita 5-1, Hirano-cho, Higashi-ku, Osaka City, Osaka Prefecture Osaka Osaka Gas Co., Ltd. (72) Yoji Murata 1814, Takachaya Komori-cho, Tsu City, Mie Prefecture Stock Company Matsuzaka Iron Works

Claims (1)

[Scope of utility model registration request] 1. A pair of contact members which can be opened and closed by a hinge and can contact the outer peripheral surface of the pipe along the pipe axis, and are fixed to one of the contact members and project in the pipe axial direction. Angle measurement of a pipe joint including a reference piece and a measuring piece that protrudes from the other contact member in the same direction as the direction in which the reference piece protrudes and is displaceable along the pipe axis. apparatus.