JPH05138415A - Steel pipe drilling magnet for magnetic drilling machine - Google Patents

Abstract

PURPOSE:To safely and simply execute drilling work to the outer periphery of a steel pipe through a magnetic drilling machine by steadily mounting the magnetic drilling machine on the outer periphery of the steel pipe. CONSTITUTION:A magnet 1 is fixed to a stand, where an electric drill 3 is arranged, and a steel core 3a is attached to the electric drill 3. In drilling a steel pipe 4, the magnet 1 is made to adhere to the steel pipe 4 at two contacting parts 5 so that the magnet 1 may coincide with the longitudinal direction of the steel pipe 4. Thus, since drilling pressure is borne by the two contacting parts 5, the magnet 1 does not oscillate in the circumferential direction of the steel pipe 4. Drilling work to the outer periphery of the steel pipe 4 using a magnetic drilling machine can therefore be safely and simply executed. In addition, arrangements for drilling the outer periphery of the steel pipe 4 is only to mount a magnetic disc on the outer periphery of the steel pipe 4 and to make them adhere to each other, and dispenses with special operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet for a magnetic drilling machine for making a hole in a steel pipe by using the magnetic drilling machine.

[0002]

2. Description of the Related Art Conventionally, in the case of making a hole in the outer circumference of a steel pipe by using a magnetic drilling machine, the magnetic drilling machine was placed on the outer circumference of the steel pipe and a magnet was attracted to the hole. At this time, since the bottom surface of the magnet has a flat shape, the contact with the steel pipe becomes a line contact, and a sufficient attraction force cannot be obtained, so that the fixing is insufficient. Therefore, during drilling, the magnetic drilling machine easily rocks and becomes unstable, which is a dangerous task.

[0003]

Conventionally, when a magnetic drilling machine was used to make a hole in the outer circumference of a steel pipe, a magnet was attracted to the outer circumference of the steel pipe, but the contact area between the bottom surface of the magnet and the steel pipe was small. In addition, the magnetic attraction was insufficient, and the magnetic drilling machine could not be sufficiently fixed to the outer circumference of the steel pipe, and the worker had to work while supporting it by hand, which was unstable work and there was a problem in safety. Also, even if you support it with your hand, the position of the hole will shift during drilling, the hole will not be a perfect circle,
In addition, there is a problem that the entire magnetic drilling machine swings, which significantly shortens the life of the blade.

An object of the present invention is to eliminate the above inconvenience by using a steel pipe drilling magnet so that the magnetic drilling machine can be sufficiently fixed to the outer circumference of the steel pipe so that the magnetic drilling machine does not move during drilling.

[0005]

The above object can be achieved by devising the shape of the magnet to eliminate the swinging of the magnetic drilling machine due to the lack of the adsorption area between the bottom surface of the magnet and the steel pipe. That is, two or more contact portions with the steel pipe may be provided on the bottom surface of the magnet of the magnetic drilling machine.

[0006]

In the magnet for drilling a steel pipe of the magnetic drilling machine as described above, when the magnetic drilling machine is attracted to the outer circumference of the steel pipe to make a hole, two or more contact portions with the steel pipe are provided on the bottom surface of the magnet to increase the attracting force. , The magnetic drilling machine body does not swing during drilling.

[0007]

Embodiments of the present invention will be described with reference to FIGS. 1, 2 and 3.

FIG. 1 shows an embodiment in which a magnet for drilling a steel pipe is attached to a magnetic drilling machine.

The magnet 1 is fixed to a stand 2, an electric drill 3 is arranged on the stand 2, and a steel core 3a is attached to the electric drill 3. When making a hole in the steel pipe, the magnet 1 may be attracted to the steel pipe 4 so that the longitudinal directions of the magnet 1 and the steel pipe 4 coincide with each other.

FIG. 2 shows the positional relationship when the magnet 1 is attracted to the steel pipe 4. The magnet 1 is in contact with the steel pipe 4 at two contact portions 5. When a conventional magnet is used, the bottom surface of the magnet 1 is a flat surface, and only one contact portion 5 with the steel pipe 4 can be obtained.
Easily rocked in the circumferential direction of the steel pipe 4, but if the magnet of the present invention is used, the two contact portions 5 receive a reaction force for punching, so that the magnet 1 moves in the circumferential direction of the steel pipe 4. It never rocks. In addition, the shape of the magnet 1 is not limited to the shape shown in FIG. 2, and the same effects can be obtained even if the shape is as shown in FIGS. 3 (a), 3 (b) and 3 (c). That is, the present invention can be implemented if the magnet and the steel pipe contact at two or more places.

[0011]

According to the present invention, the magnetic drilling machine can be stabilized on the outer circumference of the steel pipe, and it is not necessary to support the main body by hand during work. Drilling work becomes easy. In addition, the setup for making a hole in the outer circumference of the steel pipe only involves placing the magnetic drilling machine on the outer circumference of the steel pipe and adsorbing it, and no special operation is required.In addition, moving the magnetic drilling machine also stops the energization of the magnet. It is easy to lift it up, and it is also possible to add a new hole to a steel pipe that has already been piped.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnet for drilling a steel pipe of a magnetic drilling machine of the present invention.

FIG. 2 is an explanatory diagram showing a positional relationship between a magnet and a steel pipe when a magnet for drilling a steel pipe of the magnetic drilling machine of the present invention is attracted to the steel pipe.

FIG. 3 is an explanatory view showing an example of the shape of a magnet for drilling a steel pipe of the magnetic drilling machine of the present invention.

[Explanation of symbols]

 1 magnet 2 stand 3 electric drill 3a steel core 4 steel pipe 5 contact part

Claims (1)

[Claims] 1. A magnetic drilling machine comprising a magnet having a magnet coil wound around an iron core, a stand mounted on the magnet, and an electric drill mounted on the stand so as to be movable up and down. A magnet for drilling a steel pipe for a magnetic drilling machine, which allows the magnetic drilling machine to be stably placed.