JPH0825047A - Device for supporting torch - Google Patents

Abstract

PURPOSE:To easily regulate the movement of a torch along the central axis. CONSTITUTION:A piston 32a of a cylinder body 32 is entered in a cylinder tube 26 and a torch 31 is fit into a holder 19. In a time of beveling an object W to be cut, the torch 31 is moved along a circular-arc like guide rail 5 with the rotation of a pinion 9 and inclined, the hydraulic fluid of an air, etc., is supplied in a hydraulic room 26b through a piping 35, the torch 31 is moved together with the cylinder body 32 to the central axis C direction and separated upward from the object to be cut W. The movement regulation of the torch 31 is can be executed rapidly and easily with the commanding signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torch supporting device suitable for use in a high-power plasma cutting machine.

[0002]

2. Description of the Related Art A conventional torch supporting device in a gas cutting machine or a plasma cutting machine is a holder mounted on a movable member of a tilting device which enables a groove cutting, and a torch is completely fixed by a fixing member such as a bolt. It has a fixed structure.

[0003]

By the way, in a high-power plasma cutting machine, in order to improve the bevel angle of the cutting surface (product side), as shown in FIG. 5, the cutting nozzle 1 and the object to be cut are used. The interval L of the steel plate W on the central axis C of the nozzle 1 is set to be about 4 mm, which is smaller than that of a low-power plasma cutting machine by about several mm.

However, when the distance L between the nozzle 1 and the object W to be cut is reduced as described above, if the nozzle 1 is inclined as shown by the chain double-dashed line in FIG. There is a risk of approaching and contacting the cut object W.

Further, in the case of a plasma cutting machine, even if the nozzle 1 does not come into contact with the object W to be cut, if the object W is approached beyond a certain limit, the nozzle 1 and the nozzle 1 are originally supposed to start cutting. A pilot arc, which must be generated between the electrode and the electrode provided, is generated between the nozzle 1 and the workpiece W, and cutting cannot be performed.

Therefore, in the prior art, the holder is loosened and the nozzle (torch) is moved in the direction of its central axis to increase the distance L between the nozzle 1 and the object W to be dealt with. There is a problem that adjustment takes time.

An object of the present invention is to provide a torch support device in which movement adjustment of the torch is easy.

[0008]

In order to achieve the above object, the present invention provides a torch support device in which a holder for supporting the torch is tiltable substantially within a vertical plane by a tilting device. A piston is provided, and a pair of fluid chambers are formed by the pistons in a cylinder tube of a holder attached to the movable member of the tilting device, and the torch is movably inserted in the central axis direction, and the fluid chamber of the cylinder tube is inserted. A fluid supply source is connected to at least one of the two via a switching valve. The working fluid is preferably air.

[0009]

When the switching valve is switched, the working fluid from the fluid supply source flows into another fluid chamber. Therefore, the torch moves in the central axis direction due to the fluid pressure. When the working fluid is air, the structure and maintenance are simple.

[0010]

1 to 4 show an embodiment of the present invention.
In these drawings, reference numeral 2 is a swing arm. As is well known, the revolving arm 2 is provided so as to be revolvable in a horizontal plane about a vertical line V and can move horizontally in any direction of 360 degrees. At the lower end of the swing arm 2,
A carrier 3 is attached. The carrier 3 is horizontally moved in FIG. 3 by the operation of the motor 4. An arc-shaped guide rail 5 is attached to the carrier 3 so as to be bilaterally symmetrical and convex upward. The carrier 3 and the guide rail 5 are parallel to each other in a plan view. The center of the arc-shaped guide rail 5 coincides with the cutting point O of the workpiece W in a front view of the guide rail 5, and the cutting point O is a vertical line V.
It is above.

A movable member 6 is attached to the guide rail 5. The movable member 6 is attached to the guide rail 5 by sandwiching the upper and lower surfaces of the guide rail 5 with two pairs of upper and lower rollers (four in total) 7, 7, 8 and 8, and is arranged in a vertical plane along the guide rail 5. You can move with. A rack 5a is formed on the upper surface of the guide rail 5, and the rack 5a
A pinion 9 is meshed with a. The pinion 9 is attached to the rotary shaft 12 together with the worm gear 11. The worm gear 11 meshes with a worm 14 (FIG. 1) rotated by a motor 13 (FIG. 3).

A flange 15 is attached to the end of the guide rail 5, and a bellows 16 is provided between the flange 15 and the movable member 6. The bellows 16 covers the guide rail 5. Guide rail 5, movable member 6 and motor 1
3 and the like constitute a tilting device 17.

A bracket 18 (FIG. 1) is fixed to the movable member 6, and a holder 19 is attached to the bracket 18 by a round bar 20.
It is attached with a plurality of bolts 21 and 22 via. The round bar 20 is put in the V grooves 18 a and 19 a and sandwiched between the bracket 18 and the holder 19. Therefore, by relatively adjusting the tightening force of the bolts 21 and 22, the holder 19 can be vertically rotated by a small angle with the round bar 20 as a fulcrum.

A bearing 24, a cylinder flange 25, a cylinder tube 26, and a bearing 27 are inserted in the holder 19 in the above order. A bearing cap 28 is attached to the upper open end of the holder 19,
A seal flange 29 is attached to the lower surface of the holder 19. The cylinder flange 25 is fitted on the cylinder tube 26.

Reference numeral 31 is a torch provided with the nozzle 1. A cylindrical body 32 having a circular cross section is fitted in the torch 31. The cylindrical body 32 constitutes a piston rod and has a piston 32a. The torch 31 is mounted on the holder 19 by inserting the piston 32a into the cylinder tube 26 and inserting the tubular body 32 into the bearings 24, 27 and the like. The piston 32a forms a pair of upper and lower fluid chambers 26a and 26b in the cylinder tube 26.

The tubular body 32, together with the torch 31, is the holder 1
Can rotate in the circumferential direction with respect to 9, and also torch 3
It is possible to move up and down in the direction of the central axis C of 1. The central axis C of the torch 31 in the vertical state coincides with the vertical line V which is the center of rotation of the swivel arm 2. In the example of the figure,
The vertical movement distance of the torch 31 with respect to the holder 19 is 4 mm.
However, this is merely an example, and it may be smaller or larger than 4 mm.

Fluid chambers 26a, 2 of the cylinder tube 26
A fluid supply source 33 (FIG. 4) such as an air compressor is connected to 6b by pipes 34 and 35. Piping 3
An electromagnetic switching valve 36 is provided at 4, 35. The electromagnetic switching valve 36 connects the fluid supply source 33 to the pipe 34 to open the other pipe 35 to the atmosphere when the solenoid is energized, and the fluid supply source 33 when the solenoid is demagnetized.
Is connected to the pipe 35 to open the other pipe 34 to the atmosphere. When the fluid supply source 33 is connected to the pipe 34, the cylinder 32 is lowered together with the torch 31 with respect to the holder 19. Conversely, when the pipe 35 is contacted, the tubular body 32 and the torch 31 rise. The switching of the pipes 34 and 35 by the electromagnetic switching valve 36 can be reversed.

The cylinder tube 26 has an O-ring 38 for hermetically sealing the space between the cylinder tube 26 and the cylindrical body 32.
However, the cylinder flange 25 is provided with O-rings 39 and 40 for making the space between the cylinder flange 25 and the cylinder body 32 and the cylinder tube 26 airtight, and further, the piston 32.
O-rings 41 are provided in a, respectively, to make the space between the piston 32a and the cylinder tube 26 airtight.
The bearing cap 28 and the seal flange 29 are provided with scrapers 42 and 43 for scraping off dust and the like adhering to the cylindrical body 32.

Next, the operation of the torch support device of the present invention having the above structure will be described. When cutting normally,
By setting the torch 31 in the vertical state as shown in FIGS. 1 and 3 and exciting the solenoid of the electromagnetic switching valve 36, the torch 31
Is lowered to cut the workpiece W.

Further, when the groove is cut, the movable member 6 is moved along the guide rail 5 by rotating the pinion 9 by the motor 13, and the torch 31 is tilted at a predetermined angle around the cutting point O. . When the torch 31 has a large inclination angle and causes trouble, the solenoid of the electromagnetic switching valve 36 is demagnetized before or after the torch 31 is tilted, and the torch 31 is raised along the central axis C thereof.

By this operation, the torch 31 moves the object W to be cut.
Since the torch 31 comes into contact with the object W to be cut and the pilot arc is abnormally generated, it is possible to prevent the trouble from occurring. Since the torch 31 moves along the central axis C as described above, the position of the cutting point O of the workpiece W does not shift. The switching command signal for the electromagnetic switching valve 36 can be output automatically or by an auxiliary function (NC command).

In the above embodiment, both the upper and lower sides of the torch 31 are
Although the pressure of the working fluid supplied from the fluid supply source 33 to the fluid chambers 26a and 26b is used, only one of the upper and lower sides of the torch 31 is operated with the fluid pressure, and the other is provided between the holder 19 and the cylindrical body 32 or the like. It can be configured to be performed by a provided spring or the like. Air is usually used as the working fluid.
When air is used as the working fluid, the structure and maintenance are simple, but other fluids such as water can be used.

Further, the tilting device 17 rotates a pair of links, not shown, which are flexibly connected, in association with each other by the action of a plurality of pairs of pulleys and a timing belt wound around them. As a result, a known tilting device or the like that moves the torch supported by the holder at the free end of the link in an arc shape within the vertical plane can be obtained.

[0024]

As described above, the torch support device according to the present invention is a torch support device in which the holder for supporting the torch is tiltable substantially within the vertical plane by the tilting device. A pair of fluid chambers are formed by the pistons in a cylinder tube of a holder attached to the movable member of the tilting device, and are fitted movably in the central axis direction, and at least one of the fluid chambers of the cylinder tube is provided. In addition, since the fluid supply source is connected via the switching valve, the torch can be moved quickly and accurately in the central axis direction. Therefore, it is possible to prevent contact of the torch with the object to be cut, abnormal occurrence of the pilot arc, and the like, and to perform the groove cutting satisfactorily.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a torch support device according to the present invention.

FIG. 2 is a sectional view of a roller portion of the tilting device.

FIG. 3 is a front view of the tilting device.

FIG. 4 is a diagram showing an example of connection of a fluid supply source to a fluid chamber.

FIG. 5 is a schematic view showing a relationship between a nozzle and an object to be cut.

[Explanation of symbols]

 6 Movable member 17 Tilt device 19 Holder 26 Cylinder tube 26a Fluid chamber 26b Fluid chamber 31 Torch 32a Piston 33 Fluid supply source 36 Electromagnetic switching valve C Central axis

Claims (2)

[Claims] 1. A torch support device in which a holder for supporting the torch is tiltable in a substantially vertical plane by a tilting device, the torch including a piston, and a cylinder tube of the holder attached to a movable member of the tilting device. A pair of fluid chambers are formed by the pistons therein and are movably fitted in the central axis direction, and a fluid supply source is connected to at least one of the fluid chambers of the cylinder tube through a switching valve. And torch support device. 2. The torch support device according to claim 1, wherein the working fluid supplied from the fluid supply source to the fluid chamber is air.