JP3111110B2 - Plasma processing 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 plasma processing apparatus used for cutting and welding steel materials, and more particularly to a plasma processing apparatus for connecting a plasma torch to a plasma power supply with a relatively long electric cable.

[0002]

2. Description of the Related Art As one type of plasma processing apparatus of this type, for example, a plasma torch of an air plasma cutting machine, as shown in FIG.
5, a plasma power supply 30, a relay box 50, a plasma torch 40, and the like. A plasma start button 41 is provided at the base of the plasma torch 40.

[0003] The plasma power supply 30 contains an electromagnetic valve for supplying air and a high-frequency high-voltage power supply for starting plasma discharge between the electrode and the tip of the torch 40. The start switch (start switch) is closed, and the plasma main power supply and the high-frequency high-voltage power supply are turned on to apply a high-frequency high voltage between the electrode / chip of the plasma torch 40. The high frequency high voltage triggers a plasma discharge by the plasma mains power supply. The high-frequency high-voltage power supply is automatically turned off after a predetermined time.

A relay box 50 is used when the processing point is several tens of meters away from the plasma power supply 30.
The torch cable 43 connected to the plasma torch 40 via the connector 2 and the intermediate cable 32 connected to the plasma power supply 30 via the connector 31 are connected. The torch cable 43 and the intermediate cable 32 include a voltage line for applying a high-frequency high voltage to the chip, a power line for supplying power from the plasma power supply 30, a working gas supply pipe, and a start signal line connected to the plasma start button 41. It is stored. The relay box 50 has a detachable magnet 6 used as a base material terminal for forming a path through which an arc current flows in contact with the base material.
0 is connected via a base material cable 61. Magnet 6
Reference numeral 0 denotes a permanent magnet which has a switching lever (on / off). When the switching lever is turned to the on position, a magnetic path passes through the base material to generate an attraction force, and a closed magnetic circuit is set in the off position. And no longer absorbs the base material. The use of a magnet as a base material terminal as described above has been conventionally known (for example, Japanese Utility Model Laid-Open No. 3-120977 and Japanese Patent Application No. 3-204086 filed earlier by the present applicant).

[0005]

However, as shown in FIG. 4, the magnet 60 is connected to the relay box 50 via a base material cable 61.
When the magnet 60 is attracted to the base material, the base material cable 61 is easily disconnected by pulling the torch cable 43 or the like, and the disconnection may cause an electric shock accident or the like.

Accordingly, an object of the present invention is to prevent electric shock accidents and the like due to disconnection and to achieve work safety.

[0007]

A plasma processing apparatus according to the present invention comprises a plasma power supply (30) having a high-frequency high-voltage power supply for starting plasma and a main power supply for plasma processing; a plasma torch (40); )) To supply working gas to the working gas supply (20);
a), a first cable (32) covering a power line (4a) for supplying power from a main power supply for plasma processing and a working gas supply pipe (5a) and having one end connected to a plasma power supply (30); One end was connected to the plasma torch (40), covering the voltage line (3b) for applying high frequency and high voltage, the power line (4b) for supplying power from the main power supply for plasma processing, and the working gas supply pipe (5b). A second cable (43); connected to the plasma power supply (30);
A third cable (11, 12) housed in the first cable (32);
The third is connected to a cable (11, 12), the the workpiece (70)
Detachable magnet (1,2) as a processing member terminal ; and having magnet (1,2) and holding inside third cable (11,12), the other end of first cable (32) And a relay member (10) for connecting the other end of the second cable (43). The symbols in parentheses indicate the corresponding elements in the embodiments described later.

[0008]

According to this, the relay member (10) connecting the first cable (32) and the second cable (43) has the magnets (1, 2) used as terminals of the workpiece (70). Then, the third cables (11, 12) for connecting the magnets (1, 2) and the plasma power supply (30) are held therein. That is, the relay member (10) is a magnet
The third cables (11, 12) integrated with (1, 2) are not exposed to the outside. Therefore, the cable required to connect the magnets (1, 2) and the relay member (10), which was conventionally required, is omitted, and the cable is disconnected due to an excessive force such as a tensile force applied to the cable during or after work. As a result, there is no risk of electric shock or the like.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0010]

FIG. 1 shows the appearance of an embodiment of the present invention. The same parts as those in the conventional example shown in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, two magnets 1 and 2 used as base material terminals are incorporated in a relay box 10 for connecting the intermediate cable 32 and the torch cable 43, and the connection between the base material cable and the relay box 10 is omitted. is there. The magnets 1 and 2 are detachable permanent magnets (metal magnets) and have a switching lever (on / off). When the switching lever is set to the on position, a magnetic path passes through the base material to generate an attractive force. In addition, a closed magnetic path is formed in the magnet which is turned off, so that the base material is not attracted.

FIG. 2 shows an enlarged cross section of the relay box 10. The intermediate cable 32 and the torch cable 43 are
And a voltage line 3a for applying a high-frequency high voltage to the chip of the plasma torch 40, which is fixed by a frame (material: polycarbonate) 15 and accommodated in the intermediate cable 32.
Similarly to the power line 4a for supplying power from the plasma power supply 30, the working gas (air) supply pipe 5a, and the start signal lines 6a and 7a connected to the start switch (start switch) in the plasma start button 41 and the torch cable 43. The housed voltage line 3b, power line 4b, working gas supply pipe 5b, and start signal lines 6b, 7b are connected by connectors 8 and joints 9, respectively, and the internal partition plate 16 of the relay box 10 is connected.
It is fixed to. The plasma start button 41 may be used separately from the plasma torch 40. In this case, the relay box 10 does not have the start signal lines 6 and 7.

Magnets 1 and 2 are fixed to the frame 15. The magnet 1 and the magnet 2 are connected by a base material cable 11 via connection terminals 11a and 11b. The base material cable 12 connected to the magnet 1 via the connection terminal 12a is connected to the plasma power supply 30. Therefore, the plasma power source 30 → the plasma torch 40 → the base material 70 → the magnets 1 and 2
→ Base material cables 11 and 12 → A path through which the arc current flows with the plasma power supply 30 is formed. The direction of this current may be reversed depending on the voltage between the electrode of the plasma torch 40 and the base material 70. Thus, the base material cables 11 and 12
Since the cable is provided inside the relay box 10, the base material cable is not connected to the relay box 10 from the outside.

In this embodiment, two magnets 1 and 2 are incorporated in the relay box 10, but as shown in FIG.
The magnets 1 and 2 connected to the base material cables 11 and 12 may be mounted on a relay connector 80 instead of the relay box 10 shown in FIG. The relay connector 80 is fixed to the inner partition plate 86 of the rubber cylinder 85 and the intermediate cable 32 and the torch cable 43, and is a cylindrical pipe 87, 88 that houses the voltage line, the power line, the working gas supply pipe, the start signal line, and the base material cable 12. Are fixed by a connector 89. The cylindrical tube 87
The voltage line, the power line, the working gas supply pipe, the starting signal line and the voltage line, the power line, the working gas supply pipe, and the starting signal line in the cylindrical tube 88 are connected inside the connector 89, respectively.

Although two magnets 1 and 2 are used in this embodiment, one magnet may be used.

[0015]

As described above, according to the present invention, the cable for connecting the magnets (1, 2) and the relay member (10), which has been conventionally required, is omitted, so that this cable is used at the time of work or after the work is completed. There is no fear that the cable will be disconnected due to excessive force such as tensile force applied to the cable, resulting in an electric shock accident or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the relay box 10 shown in FIG.

FIG. 3 is an enlarged sectional view showing a relay connector 80 in place of the relay box 10 shown in FIG.

FIG. 4 is a perspective view showing the appearance of a conventional plasma processing device.

[Explanation of symbols]

1, 2: magnet 3a, 3b: voltage line 4a, 4b: power line 5a, 5b: working gas supply pipe 6a, 6b, 7a, 7b: start signal line 8, 89: connector 9: joint 10, 80: relay box 11 , 12: Base material cable 11a, 11
b, 12a: connection terminal 15: frame 16, 86: internal partition plate 20: air compressor 25: air unit 30: plasma power supply 31: connector 32: intermediate cable 40: plasma torch 41: plasma start button 42: connector 43: Torch cable 70: Base material 85: Rubber cylinder 87, 88: Cylindrical tube

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Okuyama 7-6-1, Higashi Narashino, Narashino City, Chiba Prefecture Inside the Equipment Division, Nippon Steel Welding Industry Co., Ltd. (72) Inventor Akio Inamura Higashi, Narashino City, Chiba Prefecture 7-6-1, Narashino Nippon Steel Welding Industry Co., Ltd. Equipment Division (56) References JP-A-54-162639 (JP, A) JP-A-63-20173 (JP, A) Jpn. (JP, U) JP-A-59-39075 (JP, U) JP-A-4-21657 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 10/00 B23K 9 / Ten

Claims (1)

(57) [Claims] A plasma power supply device having a high-frequency high-voltage power supply for starting plasma and a main power supply for plasma processing; a plasma torch; a working gas supply device for supplying a working gas to the plasma torch; A power cable for supplying power from the main power source for plasma processing, and a first cable covering one end of the working gas supply pipe and having one end connected to the plasma power supply; a voltage line for applying the high-frequency high voltage; A second cable that covers the power line for supplying power from the main power supply and the working gas supply pipe and has one end connected to the plasma torch; a third cable connected to the plasma power supply device and housed in the first cable Cable; connected to the third cable, and the end of the workpiece to the workpiece
Plasma processing comprising: a detachable magnet as a child ; and a relay member having the magnet, holding the third cable therein, and connecting the other end of the first cable to the other end of the second cable. vessel.