JP2539110Y2 - Torch breakage prevention device for thermal cutting machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing breakage of a torch for a thermal cutting machine.

[0002]

2. Description of the Related Art A cutting machine equipped with a torch for thermal cutting using plasma, laser, gas or the like is used in a two-dimensional driving device or a three-dimensional driving device.
In a so-called two-dimensional processing machine or three-dimensional processing machine mounted on a three-dimensional driving device, in order to maintain the cutting trajectory accuracy of the torch, the torch is fixed to a torch holder fixed to the driving device so that play and wobble do not occur in the torch. Like that.

[0003]

While the above-mentioned fixed state is maintained, the drive device is moved in a preset direction to cut the workpiece (hereinafter referred to as "work"). However, as shown in FIG. The cut work 17 may fall from the work table 18, and one end of the cut work 17 may protrude from the upper surface of the uncut work 19. When the torch 1 moves in the direction of the cut work 17 in order to perform the next cutting in such a state, the torch 1 collides with the protruding portion of the cut work 17, and when the impact force is remarkable, the torch 1 is damaged. Or it may break.

When one end of the cut work protrudes from the lower end of the torch, the cut work, which is an obstacle in the related art, is manually removed.
However, since the torch collides with the cut work irregularly and suddenly, and often occurs in a short period of time, the operator responds quickly to all of these,
It is difficult to avoid damage to the torch.

The present invention focuses on the above-mentioned conventional problems, and is intended for a thermal cutting machine which can suppress the impact force applied to the torch to a certain value or less when the torch collides with an obstacle such as a cut work. An object of the present invention is to provide a torch breakage prevention device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a device for preventing breakage of a torch for a thermal cutting machine according to the present invention includes a plate fixed to a device for vertically moving the torch, or a device for vertically moving the torch. At least one magnet is buried in one of the joining surfaces of the torch bracket to which the torch is fixed and the torch bracket to which the torch is fixed, and the other joining surface is adsorbed. A plurality of spheres protruding from any one of the joint surfaces abut against the conical concave portions provided on the other joint surface, thereby holding the torch holder at a predetermined position and angle, and a plate or torch bracket. And a detector for detecting the displacement of the torch holder with respect to.
The joint surface between the plate or the torch bracket and the torch holder may be flat, or the joint surface between the plate or the torch bracket and the torch holder may be spherical, or the joint surface between the torch bracket and the torch holder May be a conical surface.

[0007]

According to the above construction, the plate fixed to the device for moving the torch up and down, or the torch bracket fixed to this plate, and the magnet embedded in one of the joint surfaces with the torch holder attract the other joint surface. Therefore, when the torch collides with an obstacle and a force exceeding the attraction force of the magnet is applied to the torch, the torch holder is separated from the joint surface or displaced along the direction of action of the external force. For this reason, excessive force is not applied to the torch, and damage to the torch can be avoided.

When the torch holder is pulled away from the joint surface or displaced in the direction of action of the external force, the detector detects this, and the control device stops the operation of the thermal cutting machine, and the obstacle is removed by the operator. Is done. When restarting the cutting operation, the sphere protruding from one of the joining surfaces of the plate or the torch bracket and the torch holder is brought into contact with the concave portion of the other joining surface so that the torch holder can be easily and accurately placed. It can be mounted at a predetermined position.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment in which a device for preventing breakage of a torch for a thermal cutting machine according to the present invention is applied to a plasma cutting machine will be described.
This will be described in detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
An example will be described. A plate 4 is fixed with a bolt or the like to a drive unit 3 having a ball screw and screwed to a shaft 2 for vertically moving the torch 1. A plurality of magnets 5 are buried in the plate 4, and positioning steel balls 6 and positioning pins 7 are mounted. The torch 1 is fixed to a torch holder 8 which is flush with the plate 4. The positioning steel ball 6 is urged by a spring and abuts on a conical recess provided on the torch holder 8, and the spherical surface of the tip of the positioning pin 7 also abuts on a conical recess provided on the torch holder 8. ing. The torch holder 8 is attracted to the plate 4 by the magnet 5 and is positioned on the plate 4 by the positioning steel balls 6 and the positioning pins 7.
Is precisely fixed at a predetermined position and angle.

When the torch 1 hits the protruding portion of the cut work during the operation of the plasma cutting machine and an impact force is applied, for example, in the direction of the arrow in FIG. 1, the impact force attracts the torch holder 8. When the attraction force of the magnet 5 is exceeded, the torch holder 8 starts to separate from the plate 4, and the lower end of the torch 1 tilts to the side opposite to the point of application of the impact force. As a result, the external force applied to the torch 1 is suppressed to a certain value or less.
To prevent damage or breakage.

Further, a detector 9 attached to the torch holder 8 detects that the torch holder 8 has separated from the plate 4, and inputs this to a plasma cutting machine control device (not shown) to control the plasma cutting machine. The apparatus stops the movement of the torch 1 and the generation of the plasma arc.
When the torch holder 8 detached from the plate 4 falls, the torch 1 is damaged. To prevent this, the plate 4 and the torch holder 8 are connected by a wire 10.

Thereafter, an obstacle or obstacle such as the cut work is manually removed, and the torch holder 8 is attached to the plate 4.
Face-to-face and fixed. At this time, the torch holder 8 is easily fixed at a proper position and angle with respect to the plate 4 by the positioning steel balls 6 and the positioning pins 7, and is restored to a normal state.

In this embodiment, the plate 4 and the torch holder 8
The positioning steel ball 6 urged by a spring and the positioning pin 7 having a spherical surface at the tip are used for positioning, but the present invention is not limited to this. One or a plurality of positioning pins 7 may be used.

FIG. 2 shows a second embodiment of the present invention. A plate 4 is fixed to a drive unit 3 having a ball screw and screwed to a shaft 2 for vertically moving the torch 1, and a torch bracket 11 is fixed to the plate 4. The torch holder 12 for fixing the torch 1 includes a flange portion and a cylindrical portion, and has a hole at the center for inserting the torch 1. A plurality of magnets 13 are embedded along the circumference on the lower surface of the flange portion, and conical concave portions are provided at three places on the circumference.
A screw is provided on the outer periphery of the cylindrical portion, and a plurality of slits are provided. The torch 1 is inserted into a hole provided in the torch holder 12, and its outer periphery is fastened and fixed by a fixing nut 14 screwed to a lower portion of the torch holder 12.

The torch bracket 11 has a hole into which the torch holder 12 is loosely fitted. On an upper surface, three positioning steel balls 6 urged by a spring are projected from three places on the circumference. The positioning steel ball 6 abuts on a conical recess provided on the lower surface of the flange portion of the torch holder 12, so that the axis of the torch holder 12 with respect to the torch bracket 11, that is, the axis of the torch 1 is held at a proper position. It has become.

When the torch 1 hits a cut work or the like during the operation of the plasma cutting machine and an impact force is applied, for example, in the direction of the arrow in FIG.
Is exceeded, the lower surface of the flange portion of the torch holder 12 is separated from the joint surface of the torch bracket 11, and the lower end of the torch 1 is inclined in the direction of the impact force. Thus, the external force applied to the torch 1 is suppressed to a certain value or less. Further, the contact portion between the detector 15 attached to the plate 4 and the contact 16 fixed to the torch holder 12 is released, and the contact is opened. As a result, a plasma cutter control device (not shown) operates to stop the movement of the torch 1 and the generation of the plasma arc.

Thereafter, an interference object or an obstacle such as a cut work is manually removed, and the torch holder 12 is inserted into the torch bracket 11 by aligning the conical recess of the torch holder 12 with the positioning steel ball 6 of the torch bracket 11. As a result, the torch 1 is fixed at a proper position, and is restored to a normal state.

FIG. 3 shows a third embodiment of the present invention. Torch 1
The drive unit 3 screwed to the shaft 2 for moving the
The torch bracket 11 is fixed via the. The torch holder 12 for fixing the torch 1 includes a part of a spherical surface formed on the upper outer periphery and a cylindrical portion following the spherical surface.
A hole for inserting the torch 1 is provided at the center. A screw is provided on the outer periphery of the cylindrical portion, and a plurality of slits are provided. The spherical surface of the torch holder 12 is in close contact with the spherical surface formed on the inner periphery of the hole of the torch bracket 11. Further, the torch 1 is inserted through a hole provided in the torch holder 12, and its outer periphery is fastened and fixed by a fixing nut 14 screwed to a lower portion of the torch holder 12.

A plurality of magnets 13 are buried along the circumference of a spherical surface formed on the inner circumference of the hole of the torch bracket 11, and positioning is carried out at three places on the circumference by springs. A steel ball 6 protrudes. Torch holder 12
A conical concave portion is provided at a position corresponding to the positioning steel ball 6. The positioning steel ball 6 abuts on the concave portion, so that the axis of the torch holder 12 with respect to the torch bracket 11, that is, the torch 1. The axis is kept in a normal state.

When the torch 1 hits a cut work or the like during the operation of the plasma cutting machine and an impact force is applied, for example, in the direction of the arrow in FIG.
Is exceeded, the torch holder 12 starts to slide on the spherical surface of the torch bracket 11, and the lower end of the torch 1 tilts in the direction of the impact force.
Thus, the external force applied to the torch 1 is suppressed to a certain value or less. Further, the contact portion between the detector 15 attached to the plate 4 and the contact 16 fixed to the torch holder 12 is released, and the contact is opened. As a result, a plasma cutter control device (not shown) operates to stop the movement of the torch 1 and the generation of the plasma arc. The removal of the obstacle and the restoration to the normal state manually are the same as in the second embodiment of the second aspect.

The fourth embodiment is different from the embodiment shown in FIG. 3 in that the torch bracket 11 and the torch holder 12 shown in FIG. When an impact force exceeding the attraction force of the magnet is applied to the lower end of the torch, the conical joint surface is separated, the torch holder is tilted along the direction of the impact force while floating, and the external force applied to the torch 1 is suppressed to a certain value or less. .

[0022]

As described above, according to the present invention, the torch holder is attracted to the plate or the torch bracket by using the magnet, and when the force applied to the torch when the torch hits an obstacle exceeds the attracting force of the magnet. , The torch holder comes out of place on the plate or torch bracket,
Since it is made not to resist external force, breakage of the torch can be prevented beforehand even if the removal of the obstacle is delayed.

When the torch holder is displaced from a predetermined position, the cutting machine detects the departure and stops the cutting machine. Therefore, it is possible to avoid a cutting operation in which a predetermined cutting line for the material to be cut is deviated, and occurrence of a cutting defect. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a partially broken side view of an apparatus for preventing breakage of a torch for a thermal cutting machine according to a first embodiment of the present invention.

FIG. 2 is a partially broken side view of a device for preventing breakage of a torch for a thermal cutting machine according to a second embodiment of the present invention.

FIG. 3 is a partially broken side view of a device for preventing breakage of a torch for a thermal cutting machine according to an embodiment of claim 3;

FIG. 4 is an explanatory view showing a state in which one end of a cut work projects from a torch for a thermal cutting machine.

[Explanation of symbols]

 Reference Signs List 1 torch 4 plate 5, 13 magnet 6 steel ball for positioning 7 positioning pin 8, 12 torch holder 9, 15 detector 11 torch bracket

Claims (4)

(57) [Scope of request for utility model registration] At least one of a plate fixed to a device for moving a torch up and down, a torch bracket fixed to a device for moving a torch up and down via a plate, and a torch holder for fixing the torch is provided on at least one of the surfaces. The magnets are embedded and the other joint surface is attracted, and the plate or the torch bracket and a plurality of spheres projecting from one of the joint surfaces of the torch holder have a conical shape provided on the other joint surface. A device for preventing damage to a torch for a thermal cutting machine, comprising a detector for detecting a displacement of a torch holder with respect to a plate or a torch bracket while holding a torch holder at a predetermined position and angle by abutting on each of the recesses. . 2. The apparatus for preventing breakage of a torch for a thermal cutting machine according to claim 1, wherein the joint surface between the plate or torch bracket and the torch holder is flat. 3. The apparatus according to claim 1, wherein a joint surface between the plate or the torch bracket and the torch holder is spherical. 4. The device for preventing breakage of a torch for a thermal cutting machine according to claim 1, wherein the joint surface between the torch bracket and the torch holder is a conical surface.