JPH08243893A - Angular pipe welding bead part grinding device - Google Patents

Abstract

PURPOSE: To provide a device whereby an angular pipe welding bead part cart be high accurately ground from an angular pipe internal surface. CONSTITUTION: By positioning a carriage 10 in right/left directions in an angular pipe 1 by a side guide 20 to make the carriage 10 run in the angular pipe 1, a grinding tool 30 is accurately moved on a welding bead of the angular pipe 1, and further by adjusting weight of a weight 50, pressing force to the welding bead of the grinding tool 30 is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a square pipe weld bead grinding device for grinding a weld bead of a square pipe from the inside of the square pipe.

[0002]

2. Description of the Related Art Conventionally, as an inner surface grinding device for a pipe, a device for a round pipe has been developed, but a device for a square pipe has not been developed. The inner surface of a round pipe is ground by attaching a brush with a grindstone to a flexible shaft and rotating the brush.

[0003]

However, if the round pipe inner surface grinding device is used for the inner surface grinding of the weld bead portion of a square pipe, the parts other than the weld bead portion will be excessively ground or the weld bead portion will not be ground. There is a problem of being insufficient. This is because it is difficult for the grinding tool to correctly grind the weld bead portion, therefore parts other than the weld bead portion are ground, and it is difficult to adjust the grinding amount. An object of the present invention is to provide a square pipe weld bead portion grinding device capable of highly accurately grinding the weld bead portion of a square pipe from the inner surface of the square pipe.

[0004]

The device of the present invention for achieving the above object is as follows. A dolly, a side guide attached to the dolly, a grinding tool mounted on the dolly so that the welding bead can advance and retreat, and a weight for applying a load in a direction of pressing the grinding tool to the welding bead to the grinding tool. And a grinding tool retracting device for retracting the grinding tool away from the welding bead, and a square pipe welding bead portion grinding device.

[0005]

Since the above-mentioned device of the present invention has the side guide, the grinding tool can be correctly moved on the welding bead by adjusting the position of the device in the square pipe by adjusting the side guide. . Further, since the device of the present invention has a weight, the pressing force of the grinding tool against the welding bead can be adjusted by adjusting the weight of the weight, and it is possible to perform grinding without excessive cutting or insufficient cutting. You can As a result, the weld bead can be ground correctly, by a predetermined amount, and thus with high precision.

[0006]

1 to 6 show an embodiment of the present invention.
As shown in FIG. 1 and FIG. 2, the square pipe welding bead portion grinding device of the embodiment of the present invention is a device for grinding a welding bead 2 of a square pipe 1 having a quadrangular cross section from the inside of the square pipe. Side guide 20 attached to trolley 10
And a grinding tool 30 mounted on the carriage 10 so as to be able to move forward and backward with respect to the welding bead 2 of the square pipe 1, and a load in the direction of pressing the grinding tool 30 against the welding bead 2
A weight 50 to be applied to the welding tool 2 and a grinding tool retracting device 40 that moves the grinding tool 30 in a direction away from the welding bead 2.

The bogie 10 has wheels 13 at its front end 11 and rear end 12, and is sized so that it can be inserted into the square pipe 1. A front end 11 and a rear end 12 of the carriage 10 are connected by a frame 14. A grinding tool 30 is arranged in a space between the front end 11 and the rear end 12 of the carriage 10. An arm plate 15 is rotatably connected to the front end portion 11 of the trolley in a vertical direction, and a grinding tool 30 is rotatably supported at a tip end portion of the arm plate 15. The grinding tool 30 is composed of a substantially disk-shaped grinder,
The axis of rotation should be slightly tilted from the vertical direction (for example, 10
°) It is supported by the arm plate 15. Therefore, the grinder is in rotational contact with the weld bead portion 2 of the square pipe 1 at the outer peripheral portion and is inclined at a predetermined angle (for example, 10 °) with respect to the surface of the side where the weld bead 2 of the square pipe 1 is located.
This tilt angle is adjustable. The grinding tool 30 is rotated by an air motor 31. Air motor 3
Compressed air is supplied to 1 through the air joint port 32.

Side guides 20 are attached to the front end 11 and the rear end 12 of the carriage 10, respectively. The side guide 20 is, as shown in FIGS. 3 and 4, a square pipe 1.
Inside, there is a guide 21 extending to one side in the left-right direction and a guide 22 extending to the other side in the left-right direction.
The head portion 2 (the portion that contacts the inner surface of the side wall of the square pipe 1) is spherical. The lateral protrusion amount of the heads of the guides 21 and 22 from the carriage 10 can be adjusted. The guides 21 and 22 are urged outward by the springs 23 and 24 in the left-right direction. The side guide 20 determines the horizontal position of the carriage 10 in the square pipe 1,
The horizontal position of the grinding tool 30 in the square pipe 1 is determined. Then, the position of the grinding tool 30 inside the square pipe 1 is set by adjusting the guides 21 and 22 so that the portion of the grinding tool 30 that contacts the welding bead 2 is correctly positioned on the welding bead.

As shown in FIG. 2, a weight 50 is attached to the arm plate 15, and the pressing force of the grinding tool 30 against the welding bead 2 can be adjusted by adjusting the weight of the weight 50. is there. By adjusting the pressing force and the traveling speed of the carriage, the scraping amount of the welding bead 2 can be adjusted. A grinding tool retracting device 40 that can move the grinding tool 30 in a direction away from the welding bead 2 is attached to the rear end portion 12 of the carriage. As shown in FIGS. 1 and 5, the grinding tool retracting device 40 is composed of a cylinder (for example, an air cylinder) 41, and the vertical movement of the cylinder rod is transmitted to the arm plate 15 by the connecting plate 42, so that the arm plate 15 is moved. Is designed to swing up and down. When the arm plate 15 is swung upward, the grinding tool 30 separates from the welding bead 2. When the carriage 10 stops traveling, the cylinder 41 is operated to lift the arm plate 15 and separate the grinding tool 30 from the welding bead 2 so that the grinding tool 30 does not continue to scrape only one place of the square pipe 1. It has become. The carriage 10 may be self-propelled or may be pulled by a wire, a chain or the like. FIG. 2 shows a case where the wire 16 is pulled.

Next, the operation will be described. A weld bead 2 extends in the longitudinal direction of the square pipe 1 and the weld bead 2 is ground from the inside of the square pipe 1 as follows. The grinding device is run inside the square pipe 1 by a tension device such as the chain 16 or by self-propelling.
At this time, the grinding tool 30 is rotated to grind the welding bead 2. The side guide 20 is set in advance so that the grinding tool 30 travels while properly grinding on the weld bead 2 part. Further, the weight of the weight 50 is set in advance so that the bead grinding amount of the grinding tool 30 becomes an appropriate predetermined amount (the amount does not cause excessive cutting or insufficient cutting). When the traveling carriage 10 stops traveling in the square pipe 1, the cylinder 41 is operated to operate the grinding tool 30.
Is separated from the welding bead 2 so as not to cut the square pipe 1 too much, and the grinding tool 30 is retracted. Traveling truck 1 again
When 0 starts traveling, the air in the cylinder 41 is introduced and the grinding tool 30 is pressed against the welding bead 2 again.

[0011]

According to the present invention, a square pipe welding bead portion grinding apparatus includes a carriage, a grinding tool mounted on the carriage, and
Since the side guide is provided, the side guide can be adjusted to adjust the horizontal position of the grinding tool in the square pipe, and the grinding tool can be correctly applied to the welding bead portion. Further, since the square pipe welding bead portion grinding apparatus of the present invention has a weight, the amount of scraping can be adjusted by adjusting the weight. As a result of these, highly accurate (for example, grinding on the order of 0.1 mm) grinding of the inner weld beads of the square pipe becomes possible.

[Brief description of drawings]

FIG. 1 is a side view of a square pipe welding bead portion grinding apparatus according to an embodiment of the present invention.

2 is a plan view of the device of FIG. 1. FIG.

FIG. 3 is a front view of the device of FIG.

4 is a rear view of the device of FIG.

5 is a front view of the grinding tool retracting device of the device of FIG. 1. FIG.

6 is an enlarged plan view of a side guide of the apparatus of FIG.

[Explanation of symbols]

 1 Square Pipe 2 Weld Bead 10 Truck 15 Arm Plate 20 Side Guide 30 Grinding Tool 31 Air Motor 40 Grinding Tool Retractor 41 Cylinder 50 Weight

Claims (1)

[Claims] 1. A dolly, a side guide attached to the dolly, a grinding tool mounted on the dolly so that the welding bead can advance and retreat, and a load in a direction in which the grinding tool is pressed against the welding bead. A square pipe welding bead part grinding device comprising a weight to be applied to the tool and a grinding tool retracting device for retracting the grinding tool from the welding bead.