JPS5825545B2 - Gas cutting torch nozzle guide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torch guide for a gas cutting torch used, for example, when gas cutting a circular hole in a steel plate.

Normally, in the process of building a ship, it is necessary to form about 300 to 400 large holes with a diameter of 100 mm or more in the deck or gutter, even for a small ship of about 500 gross tons.

Such holes are generally formed by gas cutting, but by hand, by marking a circle before gas cutting and moving the torch nozzle along this circle, a neat circular hole can be formed. Moreover, since the cut end becomes saw-blade-like, it is necessary to finish it with a grinder after cutting, which poses a problem of poor workability.

Instead of this manual cutting method, a guide tool is used in which a horizontal hole is formed in a sharp fulcrum member, and a ring for supporting the torch's mouth is attached to the end of a slidable arm inserted into the horizontal hole. There is a method of gas cutting.

However, in the method using the guide tool, the tip of the fulcrum member is held against the punch hole, and the torch is moved in a circular motion with the arm around this fulcrum member, which is unstable and difficult to cut cleanly. This requires considerable skill, and furthermore, this gas cutting operation is limited to flat surfaces, which has various disadvantages.

Therefore, the present invention has developed a gas cutting torch that allows circular cutting to be performed extremely easily and accurately, and also to efficiently perform circular gas cutting not only on horizontal surfaces but also on arbitrarily inclined surfaces. The purpose is to provide a crater guide tool.

Another object of the present invention is to provide a crater guide that can prevent permanent magnets, which are part of the components, from decreasing in adsorption force or being demagnetized due to the thermal effects of high heat during gas cutting. This is what we provide.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, the rotary support 1 has a center hole 2, and a permanent magnet 3 is embedded outside the center hole 2, with its attraction surface facing the lower surface of the support 1.

The shape and number of permanent magnets 3 are arbitrary; when a circular permanent magnet 3 as shown in the figure is used, it is installed in the same window as the center hole 2, and when a plurality of permanent magnets 3 are used. are arranged in a ring shape around the center hole 2.

The permanent magnet 3 can be mounted in any desired manner in order to attract and support the rotary support base 1 to the member to be cut.

For example, when the rotary support base 1 is made of a magnetic material, a portion of the support base 1 may protrude from the lower surface of the support base 1, or it may be flush with the lower surface of the support base 1.

As in the embodiment, when the lower surface of the support base 1 is installed in a state that protrudes from the lower surface of the permanent magnet 3, it is possible to prevent the heat of the material to be cut, which becomes high during gas cutting, from being directly transmitted to the permanent magnet 3. Therefore, a decrease in the life of the permanent magnet 3 can be suppressed.

A plurality of arms 4 are arranged radially on the upper surface of the rotation support base 1 , and a seat plate 5 is supported at the inner end of each arm 4 . A heat insulating tube 6 is supported at the outer end of each arm 4, forming an appropriate gap between the outer peripheries.

The seat plate 5 is located above the center hole 2 of the rotary support base 1, and is spaced apart from the top surface of the rotary support base 1 so that the inside of the center hole 2 can be seen.

A rotating body 7 is provided on this seat plate 5.

The rotating body 7 includes a center point indicator 9 that is inserted into a hole 8 formed in the seat plate 5 and located in the center hole 2 of the rotation support base 1, and the center point indicator 9 is connected to the seat plate 5 around this center point indicator 9. It is rotatably supported via a plurality of spheres 10 provided between them.

The center point indicator 9 has a sharp point, and a flange 11 formed on the outer periphery abuts the lower surface of the seat plate 5 to prevent the rotating body 7 from moving upward.

Such a center point indicator 9 can be attached to the rotating body 7 by inserting the upper part into a hole 12 formed on the lower surface of the rotating body 7 and tightening a screw screwed from the outer periphery of the rotating body 7 toward the hole 12. Can be done.

A horizontal hole 13 is formed in the rotating body 7, passing through from a part of the outer periphery to a position opposite to the outer periphery.

A ruler 14 is slidably inserted into the horizontal hole 13.

This ruler 14 can be fixed in any position by tightening a set bolt 15 screwed into the horizontal hole 13 from the upper surface of the rotating body 7.

The ruler 14 is provided with a ring-shaped holder 16 at one end that holds the torch nozzle, and this holder 16 is positioned between opposing protrusions 17 and 17 formed on the outer end of the arm 4. , the rotating body 7 can be prevented from rotating.

Note that the means for preventing rotation of the rotating body 7 is not limited to the illustrated example;
For example, a screw hole may be formed in the arm, and a bolt insertion hole may be provided in the ruler, and the bolt may be screwed into the screw hole by aligning the insertion hole with the screw hole.

A dimensional scale 18 is formed on the ruler 14, and an indicator 19 is provided on the rotating body 7.

The holding center of the holding body 16 is the center point indicator 9 for the dimension scale 18.
It may also indicate the radius of a circular locus centered on
Alternatively, it may indicate the diameter of a circular locus.

The crater guide shown in the embodiment has the above structure, and its function will be explained next.

Now, with the set bolt 15 loosened, hold the ruler 1
4 to align the scale 18 formed on this ruler 14 with the indicator 19, then tighten the set bolt 15 and rotate the ruler 14, so that the center of the holder 16 corresponds to the indicator 19. It moves circularly around the pointer 9 with the scale 18 as the radius or diameter.

Therefore, punch or mark a center line on the iron plate, place the rotary support 1 on the iron plate so that the center of the iron plate thus formed coincides with the tip of the center point indicator 9, and place the permanent magnet 3 on the iron plate. The rotary support base 1 is fixed by suction force, the center position of the holder 16 is adjusted by sliding the ruler 14, and the torch nozzle A is inserted into the holder 16 and moved in a circular motion together with the ruler 14. A circular hole of any size can be gas cut.

Also, by sliding the ruler 14, positioning the holder 16 between the pair of opposing protrusions 17 to stop the rotating body 7 from rotating, and fixing the ruler 14 by tightening the set bolt 15, the ruler 14 can be fixed. Since the torch nozzle A can be moved along one side of the guide, gas cutting can be performed in a straight line using the guide according to the invention.

When gas cutting an iron plate like this, the temperature around the iron plate rises abnormally, and if the heat during cutting is transmitted to the permanent magnet using air as a medium, the magnetic force may become weak or the permanent magnet may become demagnetized.

However, since the heat insulating tube 6 is provided on the outside of the rotary support base 1 at a required interval, the heat insulating tube 6 can block heat conduction that adversely affects the permanent magnet 3.

As described above, according to the present invention, by embedding the permanent magnet in the rotary support base, the rotary support base can be stably and reliably attached to the workpiece to be cut via the permanent magnet, and the support Since the ruler is rotatable around the rotary body on the seat plate provided above the stand, it is easy to insert the torch nozzle into the holder provided at one end of the ruler and move the ruler in a circular motion. Due to this action, circular holes can be gas cut accurately and efficiently.

Further, in combination with the fact that the rotary support base is attached using a permanent magnet, circular holes can be gas-cut not only on horizontal surfaces but also on arbitrarily inclined surfaces.

Furthermore, since a required gap was formed on the outside of the rotary support base and a heat insulating tube was placed over it, the heat during gas cutting was transferred to the permanent magnet using air as a medium. conduction can be prevented.

As a result, it is possible to effectively suppress the decrease in the life of the permanent magnet due to thermal effects.

In addition, as in the embodiment, by providing a means for preventing the ruler from rotating, the mouthpiece of the torch can be moved along one side of the ruler, so that it can also be used for straight-line cutting work.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the guide device according to the present invention, FIG. 2 is a longitudinal sectional front view of the same, and FIG. 3 is a plan view showing another example of the use of the same. 1... Rotating support base, 2... Center hole, 3
...Permanent magnet, 5... Seat plate, 6...
...Heat insulation tube, 7...Rotating body, 9...
Center point indicator, 13... Horizontal hole, 14...
・Ruler, 15...Set bolt, 16...
...Holding body.

Claims (1)

[Claims] 1. A rotating support having a center hole, a permanent magnet embedded outside the center hole on the lower surface of the rotating support, a seat plate provided at an appropriate interval above the center hole of the rotating support, and the above-mentioned A rotatable rotating body supported by a seat plate, a slidable ruler inserted into a horizontal hole penetrating from one side of the outer periphery of the rotating body to the other side of the outer periphery, and a locking means for fixing the ruler at an arbitrary position. and a heat insulating tube that is placed over the outside of the rotary support to form a required distance between the outer peripheries of the support; 1. A torch guide for a gas cutting torch, characterized in that a center point indicator is provided at one end of the ruler, and a holder for supporting the torch is provided at one end of the ruler.