JPH0857754A - Pipe end part coating film eliminator - Google Patents

Abstract

PURPOSE: To provide a pipe end part coating film eliminator that can simultaneously eliminate coating films on both inner and outer peripheral surfaces without specifying the dimension of a polished pipe. CONSTITUTION: The respective inner and outer peripheries on a rotary table provided horizontally are provided with rotary polishing material 3, 4 with rotary shafts placed vertically and in the space adjustable state between the inside and outside. The rotational center position of the outer peripheral side rotary polishing material 4 is provided preceding that of the inner peripheral side rotary polishing material 3 in the rotating direction of the rotary table 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film removing device for pipe end portions of pipes and pipe joints (hereinafter sometimes referred to as pipes), and more particularly to pipe end portions of pipes and pipe joints having a relatively small diameter. The present invention relates to a device for removing coatings such as a rust preventive material and a black skin prior to welding the inner and outer peripheral surfaces of.

[0002]

2. Description of the Related Art When a pipe or a pipe joint is welded, a welding defect may occur if a rust preventive material or a coating such as black skin is present on the welded portion. For this reason, it is necessary to remove the coating on the inner and outer peripheral surfaces of the pipe end portion prior to welding. Up to now, the removal has been performed manually by using a hand sander, a grinder, a file, or the like.

However, in the above-mentioned manual removal work, not only a great amount of time and labor is required for the work, but also the work is dangerous and a uniform finish cannot be obtained. Fairness of mechanization 3-548
No. 39, Japanese Patent Laid-Open No. 4-30958, and No. 5-12073
It has been proposed in the Japanese publication.

[0004]

The polishing apparatus proposed in each of the above publications has an advantage that the pipe end portion of the pipe can be mechanically polished so that polishing can be performed with relatively high precision without requiring skill. For example, in the one proposed in Japanese Utility Model Publication No. 3-54839, the structure of the device is complicated and the handling at the time of polishing becomes complicated. Further, since the dedicated support member having a plurality of pipe mounting portions corresponding to the dimensions of the pipe to be polished is provided, the pipe to be polished is limited to a specific pipe size.

Further, in the proposals of Japanese Patent Laid-Open No. 4-30958 and Japanese Utility Model Laid-Open No. 5-12073, only the outer peripheral surface of the pipe is polished, and the inner peripheral surface is ground by a grinder or a grinder. There is no choice but to manually use files such as files.

The present invention has been made in view of the above problems, and an object thereof is to remove the coating film on the inner and outer peripheral surfaces of the pipe at the same time without specifying the dimensions of the pipe. It is to provide a device.

[0007]

In order to achieve the above-mentioned object, a film removing device for a pipe end according to the present invention rotates a rotary abrasive on each of the inner and outer circumferences on a horizontally provided rotary table. The axis is provided vertically and the distance between the inside and the outside can be adjusted, and the rotational center position of the rotary abrasive on the outer peripheral side is provided ahead of the rotational center position of the rotary abrasive on the inner peripheral side in the rotational direction of the rotary table. Become.

In the film removing device for the pipe end portion, the rotary abrasive material on the inner peripheral side is fixedly provided on the rotary table, while the rotary abrasive material on the outer peripheral side can be moved forward and backward toward the center of the rotary table. It may be provided in.

[0009]

According to the present invention, the pipe to be polished is placed on a horizontally provided rotary table with the pipe end facing downward, and the pipe wall is polished by being sandwiched between the rotary abrasives on the inner and outer peripheral sides. Therefore, the coating on the inner and outer peripheral surfaces can be simultaneously removed without specifying the dimensions of the tube simply by stopping the rotation of the tube. Further, since the rotation center position of the rotary abrasive on the outer peripheral side is provided ahead of the rotation center position of the rotary abrasive on the inner peripheral side in the rotation direction of the rotary table, the outer peripheral surface of the rotary abrasive on the outer peripheral side is The tube can be stably held only by lightly manually pressing it in the direction opposite to the rotation direction of the rotary table with the contact position as the fulcrum, and at the same time, the rotation of the tube can be easily stopped and polishing becomes easy.

Further, in order to sandwich the pipe wall of the pipe to be polished between the rotary abrasives on the inner and outer peripheral sides, any of the rotary abrasives on the inner and outer peripheral sides may be movably provided. The structure is simple in that one is movable and the other is fixed. Further, in that case, it is preferable to move the rotary abrasive on the outer peripheral side because the moving mechanism is simple and the attachment and the like are easy.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a pipe end portion film removing apparatus according to the present invention with a front side wall portion removed, FIG. 2 is a top view of FIG. 1, FIG. 3 is a right side view of FIG. 1, and FIG. FIG. 3 is an enlarged explanatory diagram of an X part of FIG. 2. In the figure, 1 is a pedestal, 2 is a rotary table, 3 is a rotary abrasive on the inner peripheral side, and 4 is a rotary abrasive on the outer peripheral side.

The pedestal 1 is constructed so that casters 5 are attached and is movable, and a variable speed electric motor 6 and a speed reducer 7 directly connected to its output shaft are mounted inside the pedestal 1. Also,
A bevel gear 8 is attached to the output side of the speed reducer 7.

The rotary table 2 is provided with a skirt portion 9 on the side edge and a rotary shaft 10 at the center of the lower surface.
Is pierced through the upper bearing 11 and the lower bearing 12 of the gantry 1, and the rollers 13 attached to the lower end of the skirt portion 9 at intervals of 90 degrees are received by the upper surface of the gantry 1 so as to be rotatably held. Further, at the time of this attachment, the bevel gear 14 provided on the rotating shaft 11 is meshed with the bevel gear 8. The method of receiving the rotary table 2 is not limited to this example, and a structure may be used in which one or both of the upper bearing 11 and the lower bearing 12 of the gantry 1 are provided with a bearing. Further, it may be combined with the roller 13.

The rotary abrasive 3 on the inner peripheral side and the rotary abrasive 4 on the outer peripheral side are both disk-shaped grindstones 15 and 16 in this example, and the rotary drive source is a rotary shaft at the bottom of the rotary table 2. Are air grinders 17 and 18 mounted so as to vertically project on the upper surface of the table 2. The rotary abrasives 3 and 4 are not limited to grindstones and may be wire brushes or the like. The air grinders 17 and 18 may also be electric type.

The air grinder 17 is fixed in position by attaching a bracket 19 attached to the air grinder 17 itself to a bracket 20 fixed to the lower portion of the rotary table 2 with bolts and nuts. On the other hand, the above air grinder
18 is a bracket 21 attached to the air grinder 18 itself
To the lower part of the rotary table 2 with a feed screw 22
Thus, the bracket 24, which is mounted so as to be movable back and forth in the direction of the center of the rotary table 2, is mounted with bolts and nuts so that it can be moved forward and backward. Reference numeral 25 is a detachable handle for rotating the feed screw 22. Further, 26 is a dustproof hood.

Next, the procedure for removing the coating film by the coating film removing device for the tube end portion having the above-mentioned structure will be described. First, the pipe P to remove the coating
So that the tube end faces downward and the tube wall is sandwiched between the inner peripheral rotating abrasive 3 and the outer peripheral rotating abrasive 4 on the rotary table 2 and on the inner peripheral rotating abrasive. 3 is placed on the turntable 2 so as to cover it. Next, while rotating each of the rotary table 2 and the rotary abrasives 3 and 4, the inner peripheral surface of the pipe P contacts the rotary abrasive 3 on the inner peripheral side and the outer peripheral surface contacts the rotary abrasive 4 on the outer peripheral side, respectively. As described above, the pipe P is manually rotated in the direction opposite to the rotating direction of the rotary table 2, and then the rotary abrasive 4 and the pipe P on the outer peripheral side are further rotated.
With the contact position with the outer peripheral surface of the fulcrum as a fulcrum, the table is lightly pressed in a direction opposite to the rotating direction of the rotary table 2 by hand,
Rotation is stopped so that the pipe P does not rotate together with the rotary table 2. As a result, the coating on the inner and outer peripheral surfaces of the pipe P is removed by the rotary abrasives 3 and 4.

During the removal of the film on the pipe P, the rotary abrasive 3,
When the diameter of the pipe 4 is greatly changed due to wear of 4 or the size of the pipe P is changed, the handle 25 can be used to easily adjust the movement of the rotary abrasive 4 on the outer peripheral side.

[0018]

As described above, the pipe end film removing apparatus according to the present invention can simultaneously remove the film on the inner and outer peripheral surfaces without specifying the size of the pipe.

[Brief description of drawings]

FIG. 1 is a front view showing a pipe end portion film removing apparatus according to the present invention with a front side wall portion removed.

FIG. 2 is a top view of FIG.

FIG. 3 is a right side view of FIG.

FIG. 4 is an enlarged explanatory view of an X portion of FIG.

[Explanation of symbols]

1: Stand 2: Rotating table 3:
Inner circumference rotary abrasive 4: Outer circumference rotary abrasive 5: Casters 6:
Variable speed motor 7: Reducer 8, 14: Bevel gear 9:
Skirt part 10: Rotating shaft 11: Upper bearing 12:
Lower bearing 13: Roller 15, 16: Whetstone 17,
18: Air grinder 19, 20, 21, 24: Bracket 22:
Lead screw 23: Guide 25: Handle 26:
Dustproof hood P: Pipe

Claims (2)

[Claims] 1. A rotary abrasive is provided on each of the inner and outer circumferences on a horizontally provided rotary table so that the rotation axis is vertically adjusted and the distance between the inside and the outside can be adjusted, and the rotation center position of the rotary abrasive on the outer circumference side is set. A coating removing device for a pipe end, which is provided prior to a rotation center position of a rotary abrasive on an inner peripheral side in a rotation direction of a rotary table. 2. The pipe end film removing device according to claim 1, wherein the rotary abrasive on the inner peripheral side is fixedly provided on the rotary table, while the rotary abrasive on the outer peripheral side is provided in the center direction of the rotary table. A device for removing coating from the end of a pipe that can be moved forward and backward.