JP2002301593A - Centering jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centering jig which can accurately perform centering of tubular members having different diameters, thereby can uniformize thickness of an adhering layer when the tubular members of different diameters are adhered and further can answer to centering with an inside diameter of the tubular member as a standard. SOLUTION: A through-hole 2a of a holding block 2 is formed of a hole having the same diameter as an outside diameter of a tube A. A holding means 3 is arranged in a tube B and a diameter of a contacting member 32 of the holding means 3 is extended to make a center of the inside diameter of the tube B coincide with a standard axis of the holding means 3. The holding means 3 is detachably supported to the holding block 2 by supporting means 4, 5, 6 and the standard axis of the holding means 3 is made to coincide with a central axis of the through-hole 2a of the holding block 2. Thereafter a contacting surface 7b of a positioning member 7 is brought into contact with an outer periphery of the tube B to be fixed to the holding block 2. The tube B is positioned to the positioning member 7, the tube A is inserted in the through-hole 2a and thereby centering between an outside diameter central axis of the tube A and an inside diameter central axis of the tube B is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centering jig used for bonding tubular members having different diameters while aligning their central axes.

[0002]

2. Description of the Related Art When butt-connecting tubular members such as pipes and connecting them by welding or the like, the butt-joined tubular members are held coaxially and the butt portions are temporarily fixed and welded. At this time, a centering jig is used as a means for holding and fixing the butted tubular members coaxially.

[0003] As a conventional centering jig, for example, the one described in Japanese Patent Application Laid-Open No. H08-118077 is known. The centering jig has a main body ring disposed along both sides of the butted tubular member along the outer periphery of the butted portion of the tubular member, and is attached at a predetermined interval around the main body ring to be centered. It consists of a centering adjustment bolt that is screwed in toward the center and a gap retainer that holds the butting gap (weld groove gap) between the tubular members. After adjusting the butting gap so that the desired thickness of the welding layer is obtained with the tool and adjusting the outer periphery of the butted tubular member with the centering adjustment bolt so as not to cause misalignment, the butting portion is partially Temporary welding is performed.

[0004]

The above-mentioned conventional centering jig is for holding a tubular member having the same diameter in abutting manner. When adjusting the centering, a step is formed on the outer periphery of the abutted tubular member. Adjustments are made with the goal of a state that has not occurred. Therefore, when the tubular members having different tube diameters are concentrically held, the centering adjustment cannot be performed accurately. When the tubular members having the same diameter are coaxially held and bonded (or welded), the thickness of the adhesive layer is adjusted in the axial direction of the pipe. Adjustment is possible by using the tube.However, in the case where tubular parts with different tube diameters are held concentrically and bonded, the thickness of the adhesive layer is determined by the radial gap of the tube. If it cannot be performed accurately, there arises a problem that the thickness of the adhesive layer cannot be made uniform.

Further, when connecting tubular members having different pipe diameters, a small-diameter pipe may be inserted into the large-diameter pipe for connection. In this case, the inner diameter of the large-diameter pipe is reduced. If the center does not coincide with the center of the outer diameter of the small-diameter pipe, the gap at the connection point will not be uniform. Therefore, there is a problem that the centering means based on only the outer diameter of the tubular member as in the conventional example cannot be used.

The present invention has been proposed to solve such a problem, and it is possible to accurately center tubular members having different diameters, thereby bonding the tubular members having different diameters. It is an object of the present invention to provide a centering jig that can make the thickness of an adhesive layer uniform at the time of performing, and can also support centering based on the inner diameter of the tubular member.

[0007]

In order to achieve the above object, a centering jig according to the present invention has the following features.
(Claim 1) A centering jig useful for joining two pipes having different diameters by aligning their central axes, having a through hole into which one of the pipes is fitted, and having a center of the outer diameter of the pipe. And a holding block having a conical slide surface that expands in diameter from the through hole and shares the center axis with the through hole, and is disposed in the other pipe, and is disposed in the other pipe, from the reference axis. Holding means for concentrically expanding the diameter and holding the inner surface of the tube; and supporting means for detachably supporting the holding means on the holding block so that the reference axis coincides with the center axis of the through hole. Positioning means for positioning the other tube within the sliding surface, the outer surface sliding on the sliding surface and the inner abutting surface parallel to the central axis. And a member.

(Claim 2) In the centering jig according to claim 1, the holding means has one end fixed to the support means, and the other end of which is concentrically expanded in diameter from the reference axis. A fixing member having a groove having a bottom surface along the surface and having a through hole along the reference axis; an adjusting bolt movably inserted into the through hole; Having a side surface and a contact surface parallel to the reference axis,
It is characterized by comprising a contact member that moves the contact surface concentrically from the reference axis by moving the adjustment bolt, and a lock nut screwed into a screw portion of the adjustment bolt.

(Claim 3) In the centering jig according to claim 1 or 2, the holding block comprises at least three divided pieces. (Claim 4) A centering jig useful for joining two pipes having different diameters with the same central axis, having a through-hole into which a small-diameter pipe is fitted, and having a center of an outer diameter of the pipe. And a holding block having a conical slide surface that expands in diameter from the through hole and shares a central axis with the through hole, and is disposed in the slide surface. It has an outer surface that slides on a slide surface and an inner contact surface that is parallel to the central axis, and includes a positioning member that positions a large-diameter pipe in the slide surface. .

According to the above features, the centering jig of the present invention operates as follows. (Claim 1) The centering of the outer diameter center of one tube and the inner diameter center of the other tube is performed, and the center of the outer diameter of one tube and the center of the other tube are positioned on the center axis of the through hole in the holding block. The center of the inner diameter is positioned. The through hole of the holding block is formed with a hole having the same diameter as the outer diameter of one tube, and the center of the outer diameter is positioned by fitting one tube into this through hole. The other tube has a holding means disposed in the tube, and the center of the inner diameter is made to coincide with the reference axis of the holding means by adjusting the diameter of the holding means. The holding means is detachably supported by the holding block by the supporting means, and the reference axis of the holding means (the center of the inner diameter of the other tube) and the center axis of the through hole of the holding block (the center of the outer diameter of the one tube) coincide with each other. Let it. Since the holding means and the supporting means in the pipe need to be removed for the sake of the subsequent work, in order to position the other pipe with this axis aligned, the contact surface of the positioning member should be placed on the outer circumference of the other pipe. The positioning member is fixed to the holding block by abutting. Since the positioning member is a slidable member having a contact surface that is always parallel to the central axis of the through hole in the holding block, the positioning member is slid along the sliding surface of the holding block to move the contact surface to the other. By abutting the outer circumference of the tube, the other tube can be easily positioned.

(Claim 2) The above-mentioned holding means comprises a mechanism for holding the reference axis so as to coincide with the center of the inner diameter of the other pipe. One end of the fixing member is fixed to the support means so that the center axis of the through hole into which the adjustment bolt is inserted coincides with the reference axis. On the other end side of the fixing member, a groove having a bottom surface along a conical surface that expands concentrically from the reference axis is provided. A contact member having an inner surface sliding on the bottom surface and a contact surface parallel to the reference axis is slidably attached to the groove. The adjusting bolt is arranged such that the head side faces the other end of the fixing member, penetrates through the through hole of the fixing member, and a part of the screw portion projects from one end side. The lock nut is screwed. Then, when the adjustment bolt is moved in the through hole of the fixing member while tightening the lock nut, the head of the adjustment bolt pushes the contact member, and the contact member slides along the groove of the fixing member, and the contact member Contact surface moves concentrically from the reference axis. Therefore, when the holding means is arranged in the pipe and the adjusting bolt and the lock nut are tightened, the contact surface of the contact member moves in the radial direction, and the contact surface contacts the inner surface of the pipe. Is fixed in a state in which the reference axis of (1) and the center of the inner diameter of the tube coincide with each other.

(Claim 3) The holding block may be a single unit having a through hole and a conical slide surface, or may substantially form the through hole and a conical slide surface. A similar function can be achieved even with a plurality of axially symmetrically arranged divided pieces.

(Claim 4) With the centering jig provided with the holding block and the positioning member, centering of the outer diameter of one tube and the center of the other tube can be performed. The small-diameter pipe is fitted into the through-hole of the holding block, and the center of the outer diameter of the small-diameter pipe is aligned with the center axis of the through-hole. The holding block is provided with a conical slide surface having a common central axis with the through hole.The outer surface of the large-diameter tube is brought into contact with the slide surface, and the tube is made parallel to the central axis of the through hole. When held, the outer diameter centers of the small and large diameter tubes coincide. To fix this state, the same positioning member as described above is used.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view showing the entire configuration of a centering jig according to one embodiment of the present invention. In this embodiment, the objects to be centered are a tube A having a relatively small diameter and a tube B having a large diameter, and the center of the outer diameter of the tube A and the center of the inner diameter of the tube B are centered. In the figure, a centering jig 1 includes a holding block 2, holding means 3, support frames 4 and 5, a support plate 6, and a positioning member 7.

As shown in FIG. 2, the holding block 2 is an integrated block having a through hole 2a, a slide surface 2b, and a slide groove 2c. The through-hole 2a is a cylindrical hole having the same inner diameter as the outer diameter of the pipe A such that its central axis coincides with the center of the outer diameter of the pipe A to be fitted. A slide surface 2b is formed continuously from the through hole 2a, and the slide surface 2b forms a conical surface that expands in diameter from the through hole 2a, and the conical surface shares a central axis with the through hole 2a. It is.
In addition, a plurality of portions (4
(A location) is formed with a slide groove 2c.

The holding means 3 comprises an adjusting bolt 30, a fixing member 31, a contact member 32, and a lock nut 33. With the center axis of the adjusting bolt 30 as a reference axis, this reference axis coincides with the center of the inner diameter of the pipe B. In this way, the inner surface of the tube B is held. That is, the adjustment bolt 30 is fixed to the fixing member 31.
One end of the fixing member 31 is attached to the support frame 4 such that the central axis of the through hole coincides with the reference axis. On the other end side, the fixing member 31 is provided with a plurality of grooves 31a having a bottom surface along a conical surface symmetrical to the above-mentioned reference axis and concentrically expanding in diameter from the reference axis. The contact member 32 is disposed at the second position. The contact member 32 has an inner surface 32a that slides in the groove 31a and a contact surface 32b that is parallel to the reference axis.
2b moves concentrically from the reference axis. The lock nut 33 is screwed into the screw portion of the adjustment bolt 30 to move the adjustment bolt 30 along the reference axis, and is fixed when the contact surface 32b of the contact member 32 contacts the inner surface of the pipe. is there.

The holding means 3 is detachably supported by the support frames 4 and 5 and the support plate 6 such that the reference axis (the center axis of the adjustment bolt 33) coincides with the center axis of the through hole 2a. . The support plate 6 has an insertion hole 6a through which the pipe A is inserted, and is attached at an attachment position 6b. The support frame 5 is mounted on the support plate 6 at the mounting position 5a, and the support plate 4 is mounted on the mounting position 4a.
Are attached to the support plate 5 respectively. Well-known attachment means as shown in FIG. 3A or 3B is employed for these attachments. That is,
FIG. 3A shows that a pin bolt P2 is inserted into a pin hole P1.
The one shown in FIG. 3 (b) is connected to the knock pin P3 by a bolt P4.

The holding block 2 is provided with a positioning member 7. The positioning member 7 is located within a conical surface of the slide surface 2b of the holding block 2, and has a tapered surface 7a sliding on the slide surface 2b and a slide surface 2b.
And is fixed to the holding block 2 by a fixing pin 70 in the slide groove 2 c of the holding block 2.

The operation of the centering jig in the above embodiment and the centering bonding method using the centering jig will be described below.

First, the holding member 3 is held in the tube B. This includes adjusting bolt 30 and fixing member 3 in pipe B.
1, a holding member 3 comprising a contact member 32 and a lock nut 33 and one end of the fixed member 31 attached to the support frame 4 is arranged. Here, the adjusting bolt 30 has its head side facing the other end of the fixing member 31 and the fixing member 3
One of the threaded portions is disposed so as to protrude from one end side through one through hole, and a lock nut 33 is screwed into the threaded portion. And lock nut 33
When the adjusting bolt 30 is moved in the through hole of the fixing member 31 while tightening, the head of the adjusting bolt 30 pushes the abutting member 32, and the abutting member 32 slides along the groove 31a of the fixing member. The contact surface 32b of the contact member 32 moves concentrically from the reference axis. Therefore, when the holding means 3 is disposed in the tube B and the adjusting bolt 30 and the lock nut 33 are tightened, the contact surface 32b of the contact member 32 moves in the radial direction, and the contact surface 32b is Abuts the inside of the
The fixing is performed in a state where the reference axis of the holding member 3 and the center of the inner diameter of the tube B coincide with each other.

Next, the holding member 3 holding the tube B is attached to the holding block 2. At this time, the tube B is held in the holding block 2
The support frame 4 is mounted on the support frame 5, the support frame 5 is mounted on the support plate 6, and the support plate 6 is mounted on the holding block 2. Each of the mounting of the support frames 4, 5 and the support plate 6 is preliminarily positioned with high accuracy by the mounting means shown in FIG. 3, and by performing this mounting, the reference axis of the holding member 3, that is, the tube B Is aligned with the central axis of the cone of the slide surface 2b of the holding block 2 (that is, the central axis of the through hole 2a).

Next, the position of the tube B in the holding block 2 is determined. For this purpose, the holding member 3 holding the pipe B
Is attached to the holding block 2, the positioning member 7 is moved along the slide surface 2 a, and the positioning member 7 is fixed to the holding block 2 by the fixing pin 70 while the contact surface 7 b is in contact with the outer peripheral surface of the tube B. Fixed to.

Thereafter, the lock nut 33 of the holding member 3 is loosened to separate the contact member 32 from the inner surface of the pipe B, and the support frame 4 and the support frame 5 are detached from each other. Remove 5
Further, if necessary, the support frame 5 is connected to the support plate 6.
Remove from

According to the above-described procedure, the pipe A inserted into the through hole 2a of the holding block 2 and the pipe B inserted into the contact surface 7b of the positioning member 7 fixed to the holding block 2 are outside the pipe A. The center axis of the diameter and the center axis of the inner diameter of the tube B are positioned coaxially. Then, as shown in FIG. 4, after the tube A is fitted into the through hole 2 a of the holding block 2, an adhesive layer A1 is formed on the outer peripheral surface of the tube A, and an adhesive layer B1 is formed on the inner surface of the tube B. By fitting into the contact surface 7b of the positioning member 7, the two are adhered in a state where the tube A is superimposed on the tube B. Thus tube A
When the tube and the tube B are bonded, the gap between the outer peripheral surface of the tube A and the inner peripheral surface of the tube B becomes constant over the entire circumference, so that a uniform adhesive layer is formed.

In the above description, the case where the pipe A is a small-diameter pipe and the pipe B is a large-diameter pipe is described. However, the reverse is true, that is, the pipe A is a large-diameter pipe and the pipe B is a small-diameter pipe. The same centering can be performed even in the case of the above.
In this case, strictly speaking, the center of the outer diameter of the large-diameter tube and the center of the inner diameter of the small-diameter tube coincide with each other. However, since the change in the wall thickness of each tube is small, there is no practical problem.

Referring to FIG. 5, another mode of use in the above embodiment will be described. Here, centering of the outer diameter central axis of the pipe A and the outer diameter central axis of the pipe B is performed only by the holding block 2 and the positioning member 7. As a procedure, first, the end of the tube B is brought into contact with the slide surface 2b of the holding block 2.
Then, in a state where the pipe end is in contact with the slide surface 2b, the contact surface 7b of the positioning member 7 is brought into contact with the outer peripheral surface of the tube B, and the positioning member 7 is held by the fixing pin 70 at that position. Fix to 2. The pipe B thus positioned has its outer diameter center axis coincident with the conical center axis of the slide surface 2b, that is, the center axis of the through hole 2a. Therefore, by fitting the pipe A into the through hole 2a,
The outer diameter central axis of the tube A and the outer diameter central axis of the tube B are centered. This example can be applied to the connection of a pipe having a uniform pipe thickness and having the outer diameter central axis and the inner diameter central axis coinciding. The number of jig parts is small, and the centering can be performed by a simple procedure.

Referring to FIG. 6, another embodiment of the present invention will be described. In this embodiment, the holding block is divided into three divided pieces 2.
0. The split piece 20 is adjustably attached to the adjustment hole 60a of the support plate 60, and the outer peripheral surface of the above-described tube A is fitted into the flat portion 20a of the split piece 20, and the inclined surface portion 20b is used as the slide surface. A groove 20c corresponding to the above-mentioned slide groove is formed in the slope 20b. According to such an embodiment, the split piece 2
By moving 0 along the adjustment hole 60a, centering for various kinds of pipes having different pipe diameters becomes possible.

In each of the above embodiments, an example was described in which the pipe A and the pipe B were connected via an adhesive layer.
The present invention is not limited to this, and can be applied to connection by welding or the like. Further, in the above description, the pipe B is described as having a relatively short pipe length. However, when the positioning member 7 is fixed, the pipe B is lightly brought into contact with the outer periphery of the pipe B and fixed. By inserting a long tube of the same diameter into the tube, centering regardless of the tube length is possible.

[0029]

Since the present invention is configured as described above,
Centering of tubular members with different diameters can be performed accurately,
Thereby, when connecting pipes having different diameters, the connection interval can be uniformly positioned over the entire circumference. In addition, since centering is possible with reference to the central axis of the inner diameter of the pipe, highly accurate positioning is possible when a small-diameter pipe is inserted into a large-diameter pipe and connected.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing an entire configuration of a centering jig according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a holding member of a centering jig according to one embodiment of the present invention.

FIG. 3 is an explanatory view showing a part of a centering jig according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating another embodiment of a centering jig according to an example of the present invention.

FIG. 5 is an explanatory diagram showing another use mode in the embodiment of the present invention.

FIG. 6 is an explanatory view showing another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 centering jig 2 holding block 2a through hole 2b slide surface 2c slide groove 3 holding means 30 adjustment bolt 31 fixing member 32 contact member 33 lock nut 4,5 support frame 6 support plate 7 positioning member 70 fixing pin

Claims (4)

[Claims] 1. A centering jig useful for joining two pipes having different diameters by aligning their central axes, having a through-hole into which one pipe is inserted, and having a center of an outer diameter of the pipe. And a holding block having a conical slide surface that expands in diameter from the through hole and shares the central axis with the through hole, and is disposed in the other pipe, and is disposed in the other pipe, from the reference axis. Holding means for concentrically expanding the diameter and holding the inner surface of the tube; and supporting means for detachably supporting the holding means on the holding block so that the reference axis coincides with the center axis of the through hole. Having an outer surface sliding on the slide surface and an inner contact surface parallel to the central axis,
A positioning member for positioning the other tube in the slide surface. 2. The holding means, wherein one end is fixed to the support means, and a groove having a bottom surface along a conical surface concentrically expanding from the reference axis is provided on the other end side. A fixing member having a through hole along the same, an adjustment bolt movably inserted into the through hole, an inner surface sliding on the bottom surface of the groove, and a contact surface parallel to the reference axis, A contact member for concentrically expanding the diameter of the contact surface from the reference axis by moving the adjustment bolt, and a lock nut screwed into a screw portion of the adjustment bolt. Item 6. A centering jig according to Item 1. 3. The centering jig according to claim 1, wherein the holding block is formed of at least three or more divided pieces. 4. A centering jig useful for joining two pipes having different diameters by aligning their central axes, having a through-hole into which a small-diameter pipe is fitted, wherein the center of the outer diameter of the pipe is determined. And a holding block having a conical slide surface that expands in diameter from the through hole and shares a central axis with the through hole, and is disposed in the slide surface. Having an outer surface sliding on the slide surface and an inner contact surface parallel to the central axis,
A positioning member for positioning a large-diameter pipe in the slide surface.