JPH0828763A - Adequate tightening quantity display label, tube joint tightening method using same label, and tube joint having same label - Google Patents

Abstract

PURPOSE:To reduce the labor in tightening a tube joint and provide a correct tightening quantity by applying a label on the tube joint. CONSTITUTION:A correct tightening quantity display label 41 comprises a main body application part 42 to be applied to the side of a tube joint main body 1, and a nut application part 43 to be applied to the side of a nut 5 and separated from the main body application part 42 by torque at the time of tightening the nut 5. A reference mark 45 is provided on the nut application part 43, and a primary tightening completion position display mark 47 is provided on the main body application part 42 to coincide with the reference mark 45 when the pre-tightened nut 5 is tightened for a correct tightening quantity. The main body application part 42 and the nut application part 43 of the correct tightening quantity display label 41 are applied to the tube fitting main body 1 and the nut 5 respectively, and the nut 5 is rotated till the reference mark 45 coincides with the primary tightening completion position display mark 47.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a proper tightening amount display label for pipe joints, a pipe joint tightening method using the label, and a pipe joint with an appropriate tightening amount display label.

In this specification, the front means the side where the nut advances when the nut is tightened, and the rear means the opposite side.

[0003]

2 and 3 show a conventional pipe joint.

The pipe joint shown in FIG. 2 has a tubular joint body (1) into which a pipe (2) is inserted from the rear end side and a pipe (2) protruding from the rear end side of the joint body (1). Front sleeve to be fitted
It consists of (3) and the rear sleeve (4), and a nut (5) that is screwed into the joint body (1). Outward flanges (6) are formed on the outer periphery of the intermediate portion of the joint body (1), and threaded portions (7), (8) are formed on the outer periphery of the front and rear ends thereof, respectively. A large diameter part (1a) with a slightly larger inner diameter than the front part is formed on the inner circumference of the rear end of the joint body (1), and a tapered front surface (1b) is formed on the inner circumference of the rear end. Has been formed. nut
A female thread (9) is formed on the inner circumference of the front end side of (5), and this is screwed into the male thread section (8) of the rear end of the joint body (1). An inward flange (10) is formed at the rear end of the nut (5). The outer circumference of the front sleeve (3) is formed with a taper surface (3a) that matches the taper surface (1b) of the rear end of the joint body (1), and the front tapered inner annular recess ( 11) has been formed. At the front end of the rear sleeve (4), there is formed a front tapering annular convex portion (12) which fits into the concave portion (11) of the front sleeve (3).

In the pipe joint, when the nut (5) is tightened, the front surface of the inward flange (10) of the nut (5) contacts the rear surface of the rear sleeve (4) and advances it. Then
The convex part (12) of the rear sleeve (4) is the concave part of the front sleeve (3).
Fit in (11) and fit front sleeve (3) to rear sleeve.
Move forward with (4), the front end of the front sleeve (3) contacts the tapered surface (1b) of the joint body (1). When the nut (5) is tightened by hand, it is difficult to tighten it any further.
This is the pre-tightened state, and if the nut (5) is further tightened from the pre-tightened state with a spanner, etc., the front end parts of the front sleeve (3) and the rear sleeve (4) will be deformed inward and the pipe It bites into (2) and the pipe (2) is strongly tightened, and it is in the final tightened state where fluid-tight connection is achieved.

The pipe joint shown in FIG. 3 has a tubular joint body (21).
The sleeve (23) and the rear end face of the fitting body (21) and the sleeve.
An annular gasket interposed between the front end face of (23)
(24), the sleeve (23) is fixed to the joint body (21) by a nut (25) screwed from the sleeve (23) side to the joint body (21). An outward flange (26) is formed on the outer periphery of the intermediate portion of the joint body (21), and a screw portion (28) is formed on the outer periphery of the rear end portion. A female screw (29) is formed on the inner periphery of the nut (25) on the front end side, and the female screw (29) is screwed into the male screw part (28) of the rear end of the joint body (21).
An inward flange (30) is formed at the rear end of the nut (25),
An outward flange (31) is formed at the front end of the sleeve (23).

In the above pipe joint, when the nut (25) is tightened, the front surface of the inward flange (30) of the nut (25) comes into contact with the rear surface of the outward flange (31) of the sleeve (23) and advances it. . As a result, the sleeve (23) is pulled toward the joint body (21) side, and the rear end surface of the joint body (21) and the sleeve (2
The front end face of 3) presses the gasket (24) from both sides.
When the nut (25) is tightened by hand, it becomes difficult to tighten it any further. This is the pre-tightening state, and if the nut (25) is further tightened from the pre-tightening state with a spanner or the like, the gasket (24) is deformed by the rear end surface of the joint body (21) and the front end surface of the sleeve (23). It is pressed firmly from both sides, and it is in the final tightened state where fluid tight connection is achieved.

In any of the two types of pipe joints described above, when the nuts (5) (25) are pre-tightened to the joint bodies (1) (21), the main tightening is performed with a spanner or the like. The proper amount of tightening is determined by how much the nuts (5) (25) should be rotated, such as 4 turns. And the nuts (5) (25) pre-tightened to the fitting body (1) (21)
For the final tightening, tighten the nuts (5) (25)
After pre-tightening to (1) and (21), write the reference mark on the nuts (5) and (25), and indicate the position where the reference mark should come during the final tightening. A method has been taken in which the nut is rotated until the reference mark matches the mark for indicating the final tightening end position, thereby performing the final tightening.

[0009]

In the above conventional pipe joint, when the pipe joint is tightened, it is troublesome to write the reference mark and the final tightening end position indication mark, and the mark is displaced from the proper tightening amount. There was a problem that an appropriate tightening amount could not be obtained.

An object of the present invention is to provide an appropriate tightening amount display label for pipe fittings, which can be attached to a pipe joint to reduce the trouble at the time of tightening the pipe joint and to obtain an appropriate tightening amount. To do.

Another object of the present invention is to provide a pipe joint tightening method which requires less labor when tightening the pipe joint and which can obtain an appropriate amount of tightening.

Still another object of the present invention is to provide a pipe joint with an appropriate tightening amount display label, which requires less labor at the time of tightening and can obtain an appropriate tightening amount.

[0013]

The proper tightening amount display label for a pipe joint according to the present invention is a proper tightening amount display label to be attached to a pipe joint in which a nut is pretightened in a tubular joint body. It consists of a main body pasting part that is pasted on the main body side and a nut pasting part that is pasted on the nut side and is separated from the main body pasting part by the twisting force when tightening the nut, and a reference mark is attached to the nut pasting part. When the pre-tightened nut is tightened by an appropriate tightening amount, a main tightening end position display mark matching the reference mark is attached to the main body pasting portion.

The method for tightening a pipe joint according to the present invention comprises:
Attach the body attachment part of the above appropriate tightening amount display label to the joint body, attach the nut attachment part to the nut, and rotate the nut until the reference mark matches the final tightening end position display mark to perform the final tightening. It is characterized by that.

A pipe joint with a proper tightening amount display label according to the present invention is a pipe joint having a tubular joint body and a nut pre-tightened thereto, and is attached to the body by a body attaching portion and a twisting force at the time of nut tightening. An appropriate tightening amount display label consisting of a nut pasting part separated from the part is affixed across the joint body and the nut.A reference mark is attached to the nut pasting part, and a pre-tightening is also applied to the main body pasting part. When the tightened nut is tightened by an appropriate tightening amount, a final tightening end position display mark that matches the reference mark is attached.

[0016]

According to the proper tightening amount display label for a pipe joint of the present invention, when the nut pre-tightened to the tubular joint body is finally tightened, the nut attaching portion of the label is used as the nut and the body attaching portion is attached to the joint body. It is possible to perform the final tightening by affixing the nut to the reference mark and then rotating the nut until the reference mark matches the final tightening end position display mark. Therefore, it is unnecessary to write the reference mark and the final tightening end position display mark, and moreover, the final tightening can be performed based on an accurate mark as compared with the mark written at the piping site.

According to the pipe joint tightening method of the present invention, it is not necessary to write the reference mark and the mark for indicating the final tightening end position, and moreover, the main tightening is performed on the basis of the mark which is more accurate than the mark written on the piping site. be able to.

According to the pipe joint with the proper tightening amount display label of the present invention, the final tightening can be performed by rotating the nut until the reference mark matches the final tightening end position display mark. Therefore, it is unnecessary to write the reference mark and the final tightening end position display mark, and moreover, the final tightening can be performed based on an accurate mark as compared with the mark written at the piping site.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

The pipe joint shown in FIG. 1 includes a joint body (1) having screws (7) and (8) on the outer circumferences of the front and rear ends and an outward flange (6) on the outer circumference of the middle part, and a rear end portion. Has an inward flange (10) on the rear of the fitting body (1) and a pre-tightened nut (5) on the male thread (8) on the rear side of the fitting body (1). ) And the nut (5), the proper tightening amount display label (41) is attached.

The tightening amount display label (41) is made of paper having an adhesive layer on the back surface, and the body attaching portion (42) attached to the outward flange (6) side of the joint body (1) and the nut ( 5) Consisting of a nut attachment part (43) attached to the side. Perforations (44) are provided at the boundary between the two attachment parts (42) and (43). The nut attaching portion (43) is provided with a linear reference mark (45) extending in the front-rear direction. On the body attaching part (42), the nut attaching part (4
A linear tightening start position display mark (46) extending in the front-rear direction is attached to the position corresponding to the reference mark (45) in 3), and the proper tightening amount is determined from the final tightening start position display mark (46). A linear final tightening end position display mark (47) extending in the front-rear direction is attached at a position displaced in the circumferential direction by an amount equal to. In this embodiment, since the tightening amount is 1/4 rotation, the final tightening start position display mark (46) and the final tightening end position display mark (47) are deviated from each other by 90 degrees. An arrow (48) indicating the direction of rotation when tightening the nut (5) is further attached to the main body attaching portion (42).

The above pipe fitting has a nut (5) on the fitting body (1).
Is pre-tightened and the proper tightening amount display label (41) is attached to the piping site. Then, the pipe (2) is inserted from the rear end side of the joint body (1), and the nut (5) is rotated in the direction of the arrow (48) with a spanner or the like. This allows the label
(41) is torn at the perforation (44) and the nut sticking part
(43) separates from the main body pasting part (42) and rotates together with the nut (5). Then, the nut (5) is rotated until the reference mark (45) is aligned with the final tightening end position display mark (47) to complete the final tightening.

After the final tightening, the label (41) is separated into two pieces, which reveals that the pipe joint has been assembled once, and the marks (45) (47) for displaying the tightening amount. ) Can be reminded that is untrustworthy.

In the above, each mark (45) (46) (47)
Is not limited to a linear shape, and various marks having different colors or shapes can be used. Further, the final tightening start position display mark (46) and the arrow (48) may be omitted. Notches may be used in place of the perforations (44), in short, due to the twisting force when tightening the nut (5), the body attachment part (4
(2) and the nut attachment part (43) are separated so that both attachment parts (4
2) (43) should just be connected.

The internal structure of the pipe joint is, for example, as shown in FIGS. 2 and 3, and the tightening amount display label (41) is used.
Can be used for any pipe joint provided with a tubular joint body (1) and a nut (5) screwed to the tubular joint body.

Furthermore, the tightening amount display label (41) is prepared separately from the pipe joint shown in FIGS. 2 and 3, and the pipe joint for assembling the pipe joint assembled at the piping site is finally tightened. It can also be used as a joint tightening method.

That is, the method for tightening a pipe joint using the tightening amount display label (41) is such that when the nut (5) pre-tightened in the tubular joint body (1) is finally tightened, After attaching the body attachment part (42) of the label (41) to the fitting body (1) and the nut attachment part (43) to the nut (5), attach the nut (5)
The main tightening is performed by rotating the tool until the reference mark (45) matches the final tightening end position display mark (47) with a spanner or the like. As a result, the pipe joint assembled at the piping site can be tightened by an appropriate tightening amount without any trouble.

[0028]

EFFECTS OF THE INVENTION According to the proper tightening amount display label for a pipe joint of the present invention, when the nut pre-tightened to the tubular joint body is finally tightened, it is not necessary to write the reference mark and the final tightening end position display mark. In addition, since it is possible to perform the final tightening based on a more accurate mark than the one that is written in at the piping site, by attaching this to the pipe joint, the labor for tightening the pipe joint can be reduced and it can be done properly. The tightening amount can be obtained.

According to the pipe joint tightening method of the present invention, it is not necessary to write the reference mark and the mark for indicating the final tightening end position, and moreover, the main tightening is performed on the basis of an accurate mark as compared with the mark written at the piping site. Therefore, it is possible to obtain a proper amount of tightening with less labor when tightening the pipe joint.

According to the pipe joint with the proper tightening amount display label of the present invention, the work of writing the reference mark and the final tightening end position display mark is unnecessary, and moreover, it is based on the accurate mark as compared with the mark written at the piping site. Since the main tightening can be done by tightening, the labor for tightening can be reduced and an appropriate tightening amount can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appropriate tightening amount display label for a pipe joint according to the present invention and a pipe joint to which the label is attached.

FIG. 2 is a vertical sectional view showing an example of a conventional pipe joint.

FIG. 3 is a vertical sectional view showing another example of a conventional pipe joint.

[Explanation of symbols]

 (1) Pipe fitting (2) Fitting body (3) Nut (4) Male thread (41) Tightening amount label (42) Body affixing part (43) Nut affixing part (45) Reference mark (47) Final tightening complete Position display mark

Claims (3)

[Claims] 1. A proper tightening amount display label to be affixed to a pipe joint in which a nut is pre-tightened to a tubular joint body, the body attaching portion being attached to the joint body side, and the nut being attached to the nut side. It consists of a nut pasting part that is separated from the main body pasting part by the twisting force at the time of tightening.The reference mark is attached to the nut pasting part, and the pre-tightened nut is tightened to the main body pasting part with the proper tightening amount. A proper tightening amount display label for pipe fittings that has a final tightening end position display mark that matches the reference mark. 2. When the nut pre-tightened to the tubular joint body is finally tightened, the body attaching portion of the proper tightening amount display label according to claim 1 is attached to the joint body, and the nut attaching portion is attached to the nut. A method for tightening a pipe joint, wherein a nut is rotated until a reference mark matches a mark for indicating a final tightening end position, thereby performing a final tightening. 3. A tubular joint body comprising a tubular joint body and a nut pre-tightened to the tubular joint body, wherein the body joint portion and the nut joint portion separated from the body joint portion by a twisting force when tightening the nut are appropriate. A tightening amount display label is affixed to the joint body and nut, and a reference mark is attached to the nut affixing part, and the pretightened nut is affixed to the affixing part of the main body at the proper tightening amount. A fitting with an appropriate tightening amount display label, which is marked with a final tightening end position display mark that matches the reference mark.