JPH07156271A - Method and apparatus for connecting piping material - Google Patents

Abstract

PURPOSE:To provide a method for easily setting at the time of clamping even if a piping material to be connected includes a joint, etc., such as an elbow, etc. CONSTITUTION:The method for connecting a piping material comprises the steps of providing marks P for indicating at least one positions of outer peripheries of outer peripheries S1, S2 of ends of the piping materials J1, J2 in a circumferential direction, fixing the materials J1, J2 in a state that reference marks G provided at a pair of clamps 1, 2 are matched to the marks P of the materials when the materials J1, J2 are grasped by the clamps 1, 2, and then relatively rotating the clamps 1, 2 at a grasping center as an axis to set angles of the materials J1, J2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting pipe materials such as pipes and joints formed of synthetic resin, and a connecting device therefor.

[0002]

2. Description of the Related Art As a method of connecting a pipe material of a synthetic resin molded product, the pipe material is grasped by a pair of clamps, the connecting end portions of the respective pipe materials are melted by heating with a heater, and then each handle is operated to operate the pipe material. There is a method of butt-bonding and fusion-bonding the respective melted portions by moving the clamps toward each other (for example, Japanese Patent Application No. 56-26217).

[0003]

By the way, in the case of connecting joints such as elbow in the above-mentioned joining method,
It is necessary to adjust the angle of each connection joint at the time of setting, but for adjusting the angle, for example, as shown in FIG. 5, a pair of clamps 11 and 12 are temporarily tightened with elbows J11 and J12, and the angle is measured on the elbow. It is carried out visually by applying A, and for this reason, a slight angle deviation is unavoidable and accurate angle adjustment cannot be performed at present.

Further, such angle adjustment is complicated and the workability is poor, and particularly when the assembly of the piping material is long and has many bends, many man-hours are required for setting. The number of man-hours required for setting in the joining process of each of these parts is one joint part in an average time, temporary tightening of clamp: 60se
c, Angle check: 20sec, Direction check: 10sec, Clamp fixing: 10sec, a total of 100sec is required, which is very long compared to the actual heating and melting time of the joining process: 20sec, joining time: 20sec. As shown in Fig. 6, there are many joints such as elbows, cheeses, flanges, etc.
If the number of locations is large, the total man-hours required for setting will account for about 50% of the total man-hours (40 min) of the entire assembly.

The present invention has been made in view of such circumstances, and an object thereof is to facilitate setting at the time of clamping even if a pipe material for connection includes a joint such as an elbow. A method and its connecting device are provided.

[0006]

In order to achieve the above object, the connecting method of the present invention is, as shown in FIG. 1 corresponding to the embodiment, the outer circumference of the pipe ends J1 and J2 of the pipe material to be connected. Surface S
When a mark (projection) P indicating at least one position in the circumferential direction of the outer peripheral surface is provided on 1, S2 (a), and when these respective piping materials J1, J2 are gripped by the pair of clamps 1, 2. To the reference mark (cutout groove) G provided on each clamp,
Each piping material J1, J with the mark P of the piping material
2 is fixed, and thereafter, the pair of clamps 1 and 2 are relatively rotated around the gripping center as an axis to angle the connection piping members J1 and J2.

Further, the connecting device of the present invention, as shown in FIGS. 1 and 2 corresponding to the embodiment, is a pipe member J1, J for connection.
2 has a pair of clamps 1 and 2 for gripping 2, and each of the clamps 1 and 2 has an inner peripheral surface 1a of a portion for gripping a piping material,
A reference mark (cutout groove) G is provided at a predetermined portion around 2a or the grip portion, and at least one of the clamps 1 and 2 is rotatable about the grip center of the piping material. Means (for example, a lock pin 3 and a plurality of lock pins 3) that are provided and that fix the rotational position of the clamp in at least two positions where the angular relationship with respect to the reference mark G is defined. Depression D
..D) characterized by having

[0008]

[Operation] By clamping the pipes J1, J2 with the mark P of the pipes J1, J2 aligned with the reference marks G of the pair of clamps 1, 2, the pipes J1, J2 can be respectively attached to the clamps 1, 2. Can be set accurately without misalignment. Then, after such a set is completed, one or both of the pair of clamps 1 and 2 is rotated about the gripping center of the piping material as an axis, whereby the piping materials J1 and J2 are rotated at a relative angle of 90 °, for example. The angle can be set.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of an embodiment of the present invention, and shows an example in the case of fusion-bonding a resin elbow. 2 is shown in FIG.
It is a XX arrow sectional drawing of (b).

First, the elbows J1 and J2, which are piping materials, are usually clamped at either one of both ends during the setting in the connecting step. Therefore, in this embodiment, the projections P are formed on the outer peripheral surfaces S1 and S2 of the respective end portions, as shown in FIG. 1 (a). Each of the protrusions P has a chevron cross section and extends along a plane passing through the central axes of the two sides of the elbow in a direction parallel to the respective central axes. In molding, the outer peripheral surfaces S1 and S2 are integrally molded.

On the other hand, the fusion machine (the entire structure is not shown) used for connecting the piping materials has a pair of clamps 1 and 2 facing each other and a heater (not shown) which can be arranged between the clamps. Device) and the like. In this example, a plurality of cutout grooves G ... Is provided on the inner peripheral surface of the grip portion of each of the clamps 1 and 2.

Each of the notched grooves G is a groove having a V-shaped cross section which extends along a direction parallel to the grip center of the clamp, and has a size such that the protrusion P provided on the elbows J1 and J2 fits with a slight clearance. Has been processed into. In addition, these notch grooves G ... G are located at two positions on the vertical line passing through the gripping center of the clamp, and at positions separated from each position to the left and right at a pitch of 45 °, for a total of six positions. It is provided.

Further, the clamps 1 and 2 are respectively
It is slidably arranged along arcuate guide grooves 11 and 21 provided on the clamp moving bases 10 and 20. The centers of the arcs of the respective guide grooves 11, 21 are the respective clamps 1, 2.
Of the clamps 1, 2
Is rotatable about the grip center.

The guide groove 1 of each clamp 1, 2
In the fitting part to 1, 21, there are 5 depressions D ... D at the center of the pitch at an angle of 22.5 °.
The clamp moving bases 10 and 20 are provided with one lock pin 3 at a central position in the circumferential direction of the guide grooves 11 and 21 and at a position corresponding to the location of the depression D.

The lock pin 3 is, as shown in FIG.
The guide grooves 11 and 21 are slidably arranged in a direction orthogonal to the extending direction, and are pressed by the elastic force of the compression coil spring 4 in a direction projecting into the guide grooves 11 and 21. , 2 by the rotational movement of D
When the pin centers coincide with each other, the tip end of the pin fits into the recess D, whereby the clamps 1 and 2 are fixed to the clamp moving bases 10 and 20.

In the procedure for connecting the piping materials according to the embodiment of the present invention, first, the pair of clamps 1 and 2 are set in the clamp open state and are arranged at a predetermined interval. At this time, each of the clamps 1 and 2 is in a normal posture, that is, the lock pin 3 is fitted in the central recess D of the clamp moving bases 10 and 20 as shown in FIG. 1 (b).

Next, piping materials J1 and J2 are attached to the clamps 1 and 2, respectively.
Pipe material J1
Fits the projection P into the groove G located on the upper side of the clamp in the vertical direction of the cutout groove G on the inner peripheral surface 1a of the clamp, and the piping material J2 to the other clamp 2 has the projection P slanted.
In the state that it fits into the notch groove G at the position of 45 °, tighten each clamp and fix each pipe material J1, J2.

After that, the other clamp 2 is rotated in the same direction as the inclination of the pipe material J2, and the recess D for fitting the lock pin 3 is changed to the recess D at the second position from the center, and this clamp 2 is changed. Fix it in a posture inclined at 45 ° to the vertical direction. As a result, the piping materials J1 and J2 are set in a state where the relative angle is 90 ° (FIG. 1 (c)).

A heater is arranged between the pair of clamps 1 and 2 to heat and melt the connection end of each of the piping materials J1 and J2 with or without contact with the heater heating surface, and then the heater. Then, the pair of clamps 1 and 2 are moved relative to each other to bring the melted portions of the pipe materials J1 and J2 into contact with each other, thereby performing butt fusion.

In the above connection procedure, the piping material J1,
An example in which J2 is angled at a relative angle of 90 ° has been described, but in this embodiment, the notch groove G for aligning the projection P of the piping material and the rotation angles of the clamps 1 and 2 are appropriately selected. By doing so, it is also possible to perform angulation at an angle of 22.5 °.

Further, the arrangement pitch of the depressions D ... D of each clamp 1, 2 is not limited to the angle of 22.5 °, and if the angle pitch is, for example, 15 °, it is normally required in this type of connection work. It is possible to almost satisfy the required angle out.

On the other hand, the projection P provided on the piping material is shown in FIG.
As shown in FIG. 5, the outer peripheral surfaces S1 and S2 of the pipe end may be provided at two positions facing each other. Further, as the protrusion P shape,
In addition to the ridge having a chevron cross section as shown in FIG. 1 (a), for example, a hemispherical protrusion P1 as shown in FIG. 4 (b) or the same figure.
There is no particular limitation as long as it has a shape that enables positioning during clamping, such as a pyramidal or conical projection P2 shown in (c).

Further, the positioning mark of the piping material may be a printing line L by transfer or hot stamping as shown in FIG. 4 (d), in addition to the protrusion. In this case, each clamp 1 2 and 2, instead of the notch G, markings such as dots or lines are formed around the piping material gripping portion as a positioning reference by punching or transfer.

Notch groove G as a reference mark
Does not need to be provided in multiple parts of the clamps 1 and 2,
For example, the present invention can be implemented even at only one position on a vertical line or a horizontal line passing through the grip center of the clamp.

The guide grooves provided on the clamp moving bases 10 and 20 are not only the grooves having the cross-sectional shape shown in FIG. 2, but also the guide grooves 111 having an L-shaped cross section as shown in the cross-sectional view of FIG. It may be 121.

Further, as a means for fixing the clamps 1 and 2 to the clamp moving bases 10 and 20, instead of the mechanism using the lock pin 3 described above, for example, a through hole and an insertion pin are used. Other general fixing means such as fixing or screwing may be applied.

The present invention can be applied not only to the above-described butt fusion bonding but also to socket fusion bonding or adhesive connection using a socket and an adhesive.

[0028]

As described above, according to the present invention,
At the time of setting the piping material, the mark of each piping material is aligned with the reference mark of the clamp for clamping, so that each piping material can be accurately set with respect to the clamp without angular displacement. Moreover, the clamp can be rotated around the gripping center at a specified angle pitch, and when the pipe material is angled, it is sufficient to relatively rotate the pair of clamps. Therefore, visual angle adjustment using a goniometer is not required, and piping materials such as joints can be accurately angled in a short time. In particular, when connecting a long pipe assembly, the angle adjustment becomes much easier than in the past, and the workability thereof is dramatically improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line XX in FIG.

FIG. 3 is a longitudinal cross-sectional view of a main part showing a modified example of the cross-sectional shape of the guide groove provided in the clamp moving table according to the embodiment of the present invention.

FIG. 4 is a view showing a modified example of a mark provided on a piping material.

FIG. 5 is a diagram showing an example of a conventional method for angling joints.

FIG. 6 is a diagram showing an example of a connection portion of a pipe assembly.

[Explanation of symbols]

 1, 2 Clamps 1a, 2a Inner surface G Notch groove (reference mark) D Dimple 10, 20 Clamp moving table 11, 21 Guide groove 3 Lock pin 4 Compression coil spring J1, J2 Piping material (elbow) S1, S2 Pipe Outer peripheral surface of the end P protrusion (mark)

Claims (2)

[Claims] 1. A method of holding a pipe material such as a resin pipe and a joint between a pair of clamps facing each other, and connecting the pipe materials by fusion bonding or adhesion. A mark indicating at least one position in the circumferential direction of the outer peripheral surface is provided on the outer peripheral surface of the portion, and when the pipe materials are gripped by the pair of clamps, the mark of the pipe material is attached to the clamp. Each pipe material is fixed in a state of being aligned with the reference mark provided, and thereafter, the pair of clamps are relatively rotated about the grip center as an angle to perform the angle of the pipe material. How to connect. 2. A pair of clamps for holding a pipe material such as a resin pipe and a joint, and the pipe materials are connected by fusion bonding or adhesion by relative movement of the clamps. In the connection device, the pair of clamps are provided with a reference mark on an inner peripheral surface of a portion for gripping the piping material or at a predetermined portion around the gripping portion, and at least one of the clamps grips the piping material. It is arranged so as to be rotatable about the center and has means for fixing the position of the clamp in the rotating direction to at least two positions whose angular relationship is defined with respect to the reference mark. A connecting device for pipe material.