JPH0522380Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention is characterized in that the axes of the handle of the torch and the tip of the torch intersect in a broken line, and the tip of the torch is supplied with electricity for arc generation. A piece and a nozzle covering the power feeding piece are arranged coaxially, and two sets of detection mechanisms each having a detection pin that is slidable approximately parallel to the axis of the feeding piece are provided for detecting the attachment/detachment state of the nozzle. This invention relates to a semi-automatic arc torch installed in the torch body.

<Prior Art> Generally, in a semi-automatic arc torch for cutting or welding using a plasma arc or a consumable electrode type arc, for example, as shown in FIG. Although energized, when the nozzle 3 is removed, the power supply piece is exposed to the outside, so if a worker accidentally comes into contact with the energized power supply piece 2 in this state, an electric shock may result in personal injury. Therefore, when repairing the arc torch, the detection mechanism 9 detects the nozzle 3.
It is detected that the torch body 1 is removed from the torch body 1, and based on this detection signal, the current supply to the power feeding piece 2 is controlled to be cut off, thereby ensuring work safety.

That is, in FIG. 3, 1 is the torch body;
2 is a power supply piece for arc generation that is detachably supported at the tip of the torch body 1; 3 is a nozzle that is detachably supported at the tip of the torch body 1 and coaxially covers the power supply piece 2; 4 is a nozzle that coaxially covers the power supply piece 2; The lead wire 5 for supplying current for detection is a terminal piece fixed to the end of the lead wire 4, and is formed in a bottomed shape opening in the direction of the torch tip, that is, in the _Z1 direction. 6 is a conductive detection pin that is movable in the Z direction within the bottomed terminal piece 5; 7 is a compression spring disposed between the terminal piece 5 and the detection pin 6; 8 is a bottomed detection pin; Terminal piece 5
In the illustrated case, the stopper 8 is formed by constricting a desired portion of the terminal piece 5 in the radial direction.

The detection mechanism 9 is constituted by the above 4 to 8, and as shown in the figure, the detection mechanism 9 is integrally formed, and a plurality of detection mechanisms 9, for example, two sets, are provided at the nozzle contact position of the torch body 1. It is arranged.

Of course, the nozzle 3 has at least a circumferential portion, i.e., an end face, which abuts against the detection pin 6, formed of a material having good electrical conductivity. Reference numeral 11 denotes a wiring groove disposed on the side of the torch body 1 and opening outward, in which the fixed portion of the terminal piece 5 and the lead wire 4 is housed. Reference numeral 12 denotes a cover which covers the wiring groove 11.

In the semi-automatic arc torch described above, when the nozzle is attached, the terminal piece 5, the compression spring 7, and the detection pin 6 are electrically connected through the highly conductive member of the nozzle, and a plurality of, for example, two sets of detection mechanisms 9, 9 are activated. electrically conductive.

On the other hand, when the nozzle 3 is removed, the detection pin 6 biased by the compression spring 7 is moved in the _Z1 direction,
It is positioned by coming into contact with the stopper 8. In this case, the detection mechanisms 9, 9 are electrically cut off.

In this way, the detection mechanisms 9, 9 detect when the nozzle 3 is attached and when it is not attached, and control the nozzle 3 into a processable state and a processable state, respectively.

Conventionally, as shown in FIGS. 8 and 9,
The detection mechanisms 9, 9 are on a plane including the X axis and the Z axis;
It was placed on B.

<Problems to be solved by the invention> However, during processing, the torch 20' is often moved in the Y direction, for example, the _Y2 direction, while the tip of the torch body 1' is in contact with the iron guide member 17. be. In this case, since the detection mechanism 9 is close to the guide member 17, by strongly contacting or hitting the torch body 1' with the guide member 17, the detection pin 6 or the guide cylinder portion of the detection pin The cylindrical portion of the terminal piece 5 was deformed, and the detection pin 6 could no longer slide in the axial direction. Of course, if the sliding movement of the detection pin 6 in the axial direction is obstructed, repair work must be performed to restore the detection function, which is not preferable in terms of economy and time.

To deal with this, the wall thickness of the torch body 1' may be increased, but since the housing portions of the detection mechanisms 9, 9 are formed of an electrically insulating material with relatively low mechanical strength, the detection mechanisms 9, 9 In order to effectively protect the torch body 1', the torch body 1' must be thick. However, if the torch body 1' is made thick, it is difficult to confirm the processing position, which impairs work efficiency.

<Means for solving the problem> In the semi-automatic arc torch according to the present invention, the respective axes of the handle part of the torch and the tip part of the torch intersect in a broken line shape, and the tip part of the torch has a power supply piece. A nozzle that covers the power supply piece is disposed coaxially with the torch body, and two sets of detection mechanisms each having a detection pin that can be slid approximately parallel to the axis of the power supply piece are installed in the torch body to detect whether the nozzle is attached or removed. In the semi-automatic arc torch disposed in It is characterized by having been placed.

<Example> Hereinafter, the present invention will be explained in detail with reference to the illustrated example.

1 to 3, the torch body 1 is completely the same as the conventional torch except for the position of the detection mechanisms 9, 9 relative to the torch body 1. A power supply piece 2 for generating an arc and a nozzle 3 coaxially covering the power supply piece 2 are disposed at the tip 15 of the torch body 1 to which the handle 14 is connected. Note that the axis of the handle 14 and the axis of the tip 15 of the torch intersect in a broken line shape.

Now, as shown in FIG.
They are arranged at angles α and α, respectively, with respect to a plane “B” that is perpendicular to a plane “A” that includes the axis of the torch tip 15 and includes the axis of the torch tip 15 .

Therefore, when machining is performed while the tip 15 of the torch body 1 is in contact with the guide member 17, even if the tip 15 of the torch is accidentally brought into strong contact with the guide member 17, the reaction force F will be applied to the contact point. Since the force is applied from C in the axial direction of the torch, almost no external force acts on the detection mechanisms 9, 9.

In addition, as shown in FIG. 2, the handle 14
Detection mechanisms 9, 9 are located symmetrically with respect to the axis of
By arranging this, the same effect can be obtained regardless of the dominant hand of the worker. That is, if the worker is right-handed, the guide member 17 is arranged at the position shown in the figure, and if the worker is left-handed, the guide member 17 is arranged as shown by the two-dot chain line. In addition, workers generally tend to unconsciously try to protect themselves, and when processing, the handle
handle 14 to protect fingers gripping 4.
Work is often carried out in conditions where both parties are safe. For this reason, as shown in FIG. 2, the detection mechanism 9,
9, the possibility of the detection mechanisms 9, 9 being damaged becomes extremely low. Note that the minimum interval between the detection mechanisms 9, 9 is not uniquely determined, but when considering the mechanical strength of the electrical insulating material of the torch body 1 that houses the detection mechanisms 9, 9, it is necessary to make the interval extremely small. It is preferable not to do so.

FIGS. 4 and 5 are diagrams showing main parts of other embodiments of the present invention, respectively. Since the majority of workers in Japan are right-handed, if the detection mechanisms 9, 9 are installed as shown in FIG. 4, the reaction force when the torch tip 15 and the guide member 17 come into contact can be detected. mechanism 9,
9 has no effect at all. If the detection mechanisms 9, 9 are arranged as shown in FIG. 5, the distance between the detection mechanisms 9, 9 will be increased, so that the respective detection mechanisms 9, 9 can be easily assembled.

6 and 7 are views showing the main parts of still other embodiments of the present invention, respectively. In the one shown in FIG. 6, the torch 20 is guided by the long contact surface of the torch body 1. becomes easier. In addition, in the one shown in FIG. 7, by chamfering a part of the torch body 1 which has the same diameter as the conventional one, the chamfered part and the guide member 1 can be used regardless of the operator's dominant hand.
7 makes it easier to guide the torch 20.

Specifically, during plasma arc or TIG arc machining work, an arc is generally generated by applying a high frequency, but the thickness of the electrical insulating material of the torch body 1 that houses the detection mechanisms 9, 9 is thin, when the tip 15 of the torch body 1 comes into contact with the iron guide member 17, the power supply part 13 of the torch 20←→detection pin 6 (or the cylindrical part of the terminal piece 5)←→the iron guide There is a possibility that the member 17 leaks high frequency waves. This high frequency leak may be caused by the high frequency power used, the electrical insulation material of the torch body 1,
Although it depends on the material of the guide member 17, etc.
Generally, high-frequency leaks may or may not occur when the thickness of the electrical insulating material is several millimeters.

That is, in this type of torch 20, for example, as shown in FIG. 2, by providing an angle α with respect to the plane "B", the same effect as providing an insulation distance of 2 to 3 mm is obtained, so the present invention is particularly advantageous. It is valid. Note that when focusing on high frequency leakage, the minimum distance between each end of the detection mechanisms 9 is about 2 mm.

<Effect of the invention> As is clear from the above explanation, the semi-automatic arc torch according to the invention has a plane that includes the respective axes of the tip of the torch and the handle; plane containing; 2 at a position other than B
Since the set detection mechanism is provided, when machining is performed while the tip 15 of the torch body 1 is in contact with the guide member 17, even if the tip 15 of the torch is accidentally brought into strong contact with the guide member 17, , the reaction force F acts in the direction of the axis of the torch from the contact point C, and almost no external force acts on the detection mechanisms 9, 9, so the detection function of the detection mechanisms 9, 9 is not impaired. Since the wall thickness of the torch body 1 can be made as small as possible compared to the conventional torch body, it is easy to observe the processing position, and the work efficiency can be improved.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the present invention;
The figure is a partially sectional plan view of Fig. 1, Fig. 3 is a sectional view taken along the line "A"--"A" of Fig. 1, and Fig. 4 to 7 are cross-sectional views.
The figures are views showing other embodiments of the present invention and correspond to Fig. 2, Fig. 8 is a perspective view showing a conventional example, and Fig. 9 is a cross-section of a part of Fig. 8. FIG. DESCRIPTION OF SYMBOLS 1...Torch body, 2...Power supply piece, 3...Nozzle, 9...Detection mechanism, 14...Handle, 15...
...Torch tip, 17...Guide member, 20...
…torch.

Claims (1)

[Scope of utility model registration request] The respective axes of the handle part of the torch and the tip part of the torch intersect in a broken line shape, and a power feeding piece and a nozzle covering the power feeding piece are coaxially disposed at the tip part of the torch, and the nozzle is attached and detached. In a semi-automatic arc torch, in which two sets of detection mechanisms each having a detection pin that is slidable approximately parallel to the axis of the power supply piece are arranged in the torch body, the tip of the torch and the handle are A semi-automatic arc torch in which the detection mechanism is disposed at a position other than a plane including the respective axes; a plane perpendicular to A and including the axis of the torch tip;