JPS62855Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a flange mounting jig that can quickly set and mount the flange to the correct mounting position at the pipe end when welding the flange to the pipe end. .

For example, if it is necessary to connect one end of a pipe without a flange to another pipe, a flange will be attached to the mouth end of at least one pipe by welding, but this attached flange will be attached to the mouth end of the pipe. It must be installed in the correct position to match the bolt holes in the flange of the mating pipe.

In the past, when such a flange attachment work was performed, the procedure was generally as shown in FIG. 1. That is, first, with the flange 2 inserted into the pipe 1, as shown in a, the flange 2 is inserted into the pipe opening so that a welding margin 3 of the correct width is formed between the inner peripheral surface of the flange 2 and the mouth end surface of the pipe 1. Move it slightly forward from the edge. Next, while maintaining this welding allowance 3, rotate the flange 2 to align the holes ( hole swing). Next, as shown in c, tack 5 ₁ is attached to one point of the welding allowance 3.
In this state, use a level etc. to adjust the flange 2.
Adjust the angle so that it is attached to the pipe 1 at the correct angle. Next, as shown in d, tacking ₅₂ is performed at a position diagonal to the position of tacking ₅₁ . After temporarily attaching these two points 5 ₁ and 5 ₂ , it is detected whether the mounting angle at a position 90° phased with the direction in which the angle of the pipe 1 and flange 2 was adjusted in step c above is correct, and the hammer After correcting the angle by tapping lightly, the remaining two points are temporarily attached 5 ₃ and 5 ₄ as shown in e to determine the correct mounting position of the flange 2.

In this way, conventional flange installation work requires accurate positioning until welding, which is not only troublesome but also time-consuming and labor-intensive. The problem was that it lacked accuracy and was inefficient.

The purpose of the present invention is to provide a mounting jig that solves the above-mentioned problems in the flange mounting work and allows the flange to be mounted simply, efficiently, and accurately.

Next, the flange mounting jig according to the present invention will be described in detail based on the embodiment shown in Fig. 2 and below. Fig. 2 is a sectional view showing the structure of one embodiment, and the flange
The seat plate 11 is made of a disk having approximately the same diameter as the seat plate 1.
It consists of a cylindrical main body 12 having a smaller diameter than the inner diameter of the pipe 1 and having a chuck 13 provided on the back surface of the pipe 1.

The seat plate 11 has a peripheral portion 15 cut into a thin shape so that a stepped portion 14 having the same outer diameter as the pipe 1 is provided at the center of the back surface. The width of this stepped portion 14 is such that when the flange 2 inserted into the pipe 1 in advance is brought into close contact with the back surface of the thin peripheral portion 15 as shown by the chain line in FIG. The width is set in advance so that an appropriate welding margin 3 as shown in FIG. 5 is formed between the opening end surface 32 of Further, a plurality of positioning holes 16 for positioning the bolt holes 4 in the flange 2 are provided in the thin peripheral portion 15 of the seat plate 11, as shown in FIG. At least one pair of positioning holes 16 are provided corresponding to different bolt holes 4 depending on the type of flange. Furthermore, on a part of the surface of this seat plate 11, there is a pendulum needle 17 whose upper end is supported by a pin 18 so as to be swingable;
A protractor scale 19 is provided that allows the pendulum needle 17 to detect the exact angle of the seat plate 11.

The cylindrical main body 12 provided on the back surface of the seat plate 11 is
It consists of a cylinder having a bottom 20 with a diameter smaller than the inner diameter of the pipe 1, and is fixed to the back surface of the thick walled part 21 of the seat plate 11. The main body 12 also has a plurality of elongated holes 22 formed on the circumferential surface and extending along the axial direction.
4 are crimped onto the inner peripheral surface of the pipe 1, and chucks 13 are provided radially so as to be retractable in and out of the main body 1, respectively. Each of these chucks 13 has an inner end 25 with a tapered surface, and this inner end 25 is connected to a conical body 27 provided inside the main body 12 of a shaft 26 that is supported through the seat plate 11 and the center of the main body 12. Supported by.
This conical body 27 is screwed onto a threaded portion 28 provided inside the main body 12 of the shaft 26, and when the shaft 26 is rotated via a handle 29 provided at the outer end of the shaft 26, the shaft 26 is rotated. It moves in the axial direction, thereby allowing the chuck 13 to move in and out of the main body 12. The outer end 25 of each chuck 13 is held down by a rubber ring 30 fitted around the outer periphery of the main body 12 so that it does not slip out of the elongated hole 22, for example.

To attach the flange 2 using this attachment device, first, as shown in FIG. At this time, the position of the seat plate 11 is correctly corrected using the protractor scale 19 and the pendulum needle 17 on the surface. Then, by rotating the shaft 26, each chuck 13 is equally projected through the cone 27, and the outer end 24 of each chuck is attached to the pipe 1.
The centers of the seat plate 11 and the main body 12 are aligned with the center of the pipe 1 by crimping them onto the inner peripheral surfaces of the pipe 1. In this state, the stepped portion 1 on the back side of the seat plate 11
Since the outer peripheral surface of 4 and the outer peripheral surface of the pipe 1 exactly match, the flange 2 inserted in advance into the pipe 1 is brought into close contact with the back surface of the thin peripheral portion 15 of the seat plate, and in this state, the bolts of the flange 2 are tightened. The position of the flange 2 is fixed by aligning the position of the hole 4 with the positioning hole 16 of the seat plate 11 and inserting a pin.
Once the mounting position of the flange 2 has been determined in this way, temporary attachments 31 are performed in about three places on the back of the flange 2 and the outer peripheral surface of the pipe 1, and the chuck 13 is attached.
Remove the device from pipe 1 by loosening the .
As shown in FIG. 5, when the device is removed, an appropriate welding margin 3 is formed between the inner circumferential surface 23 of the flange 2 and the pipe opening end surface 32, so the necessary welding is performed on this portion to close the flange 2. Secure it completely to pipe 1.

As stated above, in the mounting device of the present invention,
With the seat plate 11, which serves as a reference for positioning the flange 2, in close contact with the pipe mouth end surface 32, the main body 12
Since the plurality of chucks 13 provided in the seat plate 11 are evenly crimped onto the inner peripheral surface of the pipe, the center of the seat plate 11 can be accurately aligned with the pipe center, and the position with the positioning hole 16 provided in the seat plate 11 can be adjusted. By alignment (drilling), the mounting position of the flange 2 relative to the pipe mouth end can be set extremely quickly. Of course, when the flange 2 is set on the back side of the seat plate 11 as described above, the seat plate 11
is fixed to the pipe mouth end face 32 at a correct angle, so the angle of the flange 2 is at an accurate position with respect to the pipe mouth end, and the troublesome angle adjustment by conventional installation work can be completely eliminated.

In addition, since the seat plate 11 has a stepped portion 14 having the same diameter as the outside diameter of the pipe 1 on the back surface and has a thin peripheral portion 15, the flange 2 is in close contact with the back surface of the thin peripheral portion 15. If the device is removed after the temporary attachment 31 is performed, an appropriate welding distance 3 can be obtained between the pipe mouth end surface 32 and the flange inner circumferential surface 23, so the welding distance 3 can be set without any trouble.

Therefore, by using this device, the flange attachment work can be performed much more easily and accurately than conventional manual work, and this type of work can be greatly streamlined.

[Brief explanation of the drawing]

Figures 1 a to e are process diagrams showing the procedure of conventional flange mounting work, Figure 2 is a sectional view showing the configuration of a mounting device according to an embodiment of the present invention, Figure 3 is a front view, and Figure 4 is a FIG. 2 is a sectional view taken along the - line in FIG. 2, and FIG. 5 is a sectional view of the pipe mouth end with the device removed. In the figure, 1...Pipe, 2...Flange, 3...Welding allowance, 11...Seat plate, 12...Main body, 13...Chuck, 14...Step part, 15...Thin peripheral part, 16
... Positioning hole, 17 ... Pendulum needle, 19 ... Protractor scale 21 ... Thick wall part, 23 ... Flange inner peripheral surface, 26 ... Shaft, 27 ... Cone, 30 ... Rubber ring, 31 ... ...Temporarily attached, 32...Pipe opening end surface.

Claims (1)

[Claims for Utility Model Registration] 1. The peripheral part 15 is made thin by providing a stepped part 14 with the same outer diameter as the outer diameter of the pipe 1 in the center of the back surface, and the positioning hole 16 for a bolt hole is formed in the thin peripheral part 15. The opened flange-shaped seat plate 11 and the pipe 1 fixed to the back thick part 21 of the seat plate 11
By moving in the axial direction the cylindrical main body 12 with a smaller diameter than the main body 12 and the conical body 27 provided in the main body 12 of the shaft 26 inserted through the center of the seat plate 11 and the main body 12, A plurality of chucks 1 are provided on the main body 12 so as to be able to appear and appear at will.
A pipe flange installation jig consisting of 3. 2. The pipe flange mounting jig according to claim 1, which has a protractor scale 19 with a pendulum needle 17 on a part of the surface of the seat plate 11.