JP3591187B2 - Plasma cutting torch - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plasma cutting torch that can be used as a pencil type or curved type plasma cutting torch by itself.
[0002]
[Prior art]
A conventional plasma cutting apparatus using a working gas will be described with reference to FIGS.
[0003]
In FIG. 3, reference numeral 10 denotes a working gas such as air; 11a, a curved plasma cutting torch; and 11b, a pencil-type plasma cutting torch, which are selectively used depending on the operation. 12 is a compressor for compressing the working gas 10 and sending it to the curved plasma cutting torch 11a or the pencil type plasma cutting torch 11b, 13 is a regulator for adjusting the secondary pressure of the working gas 10 to a constant value, 14 is a power input terminal, Reference numeral 15 denotes a cutting power supply for supplying a current to the plasma cutting torch 11a or 11b, and reference numeral 16 denotes a ground cable connecting the base material 17 and the cutting power supply 15.
[0004]
Then, from the cutting power supply 15, a cooling cable 18 containing a copper wire is mounted on an insulating hose having a pressure resistance for sending the working gas 10 such as air to the tip of the torch, and a high frequency for improving the arc start. A cable 21 of a torch switch 20 for connecting and disconnecting a pilot cable 19 in which a copper wire is insulated with a synthetic resin or the like and a copper wire coated with a synthetic resin or the like to turn on and off an output is extended, and a plasma cutting torch is provided at the tip thereof. 11a or 11b was attached.
[0005]
Next, the tip of the pencil type plasma cutting torch 11b will be described with reference to FIG.
[0006]
In FIG. 4, a torch body 21 is attached by screwing an electrode 22 to a tip end of a torch body fitting 21a made of a cylindrical copper alloy, and a tip 23 for mechanically contracting a plasma arc around the outer periphery of the electrode 22. A heat-resistant insulating cylinder 21b for diverting the working gas 10 is mounted on the inner and outer surfaces of the torch body 21. A nozzle fitting 21c for screwing a copper or copper alloy tip 23 around the outer periphery of the heat-resistant insulating cylinder 21b is mounted. Was screwed with a heat-resistant insulating cylindrical handle 24 at one end, and a heat-resistant insulating ceramic nozzle 25 was mounted at the other end. The pilot cable 19 is connected to the nozzle fitting 21c of the torch body 21, and the working gas 10 passes through the inside of the torch body center fitting 21a of the torch body 21 from the cooling cable 18 and is diverted by the heat-resistant insulating cylinder 21b. Further, it is ejected through the inner and outer surfaces of the chip 23.
[0007]
FIG. 4 shows a pencil-type plasma cutting torch. The basic structure of the curved-type plasma cutting torch is the same, except that it is bent at a fixed angle.
[0008]
Further, in the structure of the pencil type plasma cutting torch 11b of FIG. 4, the torch body 21 and the handle 24 are screwed, but they may be fastened with screws, and both are fixed structures. The handle 24 cannot be bent. Further, the curved plasma cutting torch 11a cannot be bent at an arbitrary angle.
[0009]
As described above, the curved or pencil-shaped plasma cutting torches 11a and 11b which are fixed are selectively used according to the shape of the base material to be cut. For example, a pencil-shaped plasma cutting torch 11b into which the tip of the torch can be easily inserted is used for a base material such as a concave or corrugated plate, and a curved cutting torch 11a is used for cutting the inside of a cylindrical shape.
[0010]
[Problems to be solved by the invention]
As described above, in the conventional example, two plasma cutting torches having different shapes according to the shape of the cutting base material had to be prepared, and the inconvenience of reconnecting and the cost for two were required.
[0011]
For this reason, if a pencil-shaped or curved-type plasma cutting torch is manufactured with one piece, the trouble of reconnecting and the cost for two pieces are eliminated. However, in the case of using only one, switching between the pencil type and the curved type is simple and does not increase the outer shape, keeps the working gas airtight, has sufficient electric connection, and insulates the electric path. That was the challenge.
[0012]
An object of the present invention is to solve these conventional problems.
[0013]
[Means for Solving the Problems]
In order to achieve this object, a first means of the present invention is to provide, at one end of a heat-resistant insulating cylindrical handle into which a pilot cable or a cooling cable is inserted, a pivotal support perpendicular to the center axis of the heat-resistant insulating cylindrical handle. A pair of shaft-like bearing holes are provided to fit between the bearing holes of the heat-resistant insulating cylindrical handle, respectively, and between the first connection member connected to the cooling cable and the second connection member connected to the pilot cable. The torch body is pivotally supported by a pin mounted concentrically with the center of the bearing hole of the heat-resistant cylindrical handle, and the torch body and an elastic body such as a coil spring or a leaf spring for holding the first connection member are mounted. An O-ring is provided to make the space between the torch body and the first connecting member airtight, so that the handle and the torch body can be bent. Further, the second means of the present invention may further comprise, in addition to the first means, a semicircular outer periphery of the handle or the torch body for fixing the handle or the torch body of the plasma cutting torch. irregularities provided, is provided with a heat insulating sliding member for fixing the pushing through an elastic body such as the semicircular outer periphery a coil spring or a plate spring so as to fit to the unevenness provided.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the configuration of the first means, the torch body and the handle can be bent by the pivot shaft, and the single plasma cutting torch can be commonly used as a pencil type or a curved type without increasing the outer shape. Further, with the configuration of the second means, in order to fix the handle and the torch body, the unevenness of the sliding member can be fitted to the unevenness of the semicircular outer peripheral portion of the handle or the torch body, and the torch body can be fixed at an arbitrary angle. Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 (a) and 1 (b) and FIG. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.
[0015]
1 (a) and 1 (b) show the configuration of the tip of the plasma cutting torch, and FIG. 2 shows a cross section taken along the line AA of FIG. 1 (b). First, in FIG. 2, the pivotal end 1b of the heat-resistant and insulating cylindrical handle 1a is divided in half, and the interior of the pivotal end 1b is opened, and the cooling cable 18 and the pilot cable 19 are inserted. The pivot end 1b of the handle is provided with a pair of bearing holes 3a and 3b provided on a pivot shaft 2b orthogonal to the center axis of the handle, and the first connection member 5a and the second connection member 5b are connected to the bearing holes of the handle. 3a and 3b, respectively. The pivotal end 1b of the handle is connected to the cooling cable 18 and the pilot cable 19 housed inside the handle and insulates a portion exposed to the outside, so that the torch body 4 is connected to the first connection member 5a. Between the second connecting members 5b, the pivot shafts 2b of the bearing holes 3a, 3b of the handle are pivotally supported by pins 5c arranged concentrically. Further, a coil spring 6 or a leaf spring is disposed concentrically with the bearing holes 3a and 3b, and the torch body 4 is pressed and connected to the first connection member 5a and the second connection member 5b. Further, an O-ring 7 is used to make the space between the torch body center fitting 4a and the first and second connection members 5a and 5b airtight.
[0016]
Next, the bending of the pivot end 1b of the handle 1a and the torch body 4 will be described with reference to FIGS. 1 (a) and 1 (b). As shown in FIG. 1B, the end of the pivotal support end 1b of the handle 1a of the plasma cutting torch is formed in a semicircular shape, and the semicircular outer peripheral portion is provided with irregularities. In this structure, the coil spring 9 is slid so as to be fitted into the unevenness provided on the semicircular outer peripheral portion, and is pressed and fixed by the coil spring 9.
[0017]
【The invention's effect】
As described above, according to the first means of the present invention, it is possible to bend at the intersection of the center of the torch body and the handle, so that a single plasma cutting torch can be used in a pencil or curved shape without increasing the outer shape. And has an excellent effect of being able to cope with various cutting base material shapes. Further, according to the second means of the present invention, since it is possible to fit the pivotal end of the handle and the unevenness of the heat-resistant insulating sliding member and fix it at a required angle, it can be applied to various cutting base material shapes. It has the effect that it has.
[Brief description of the drawings]
FIG. 1 (a) is a front view showing a tip of a plasma cutting torch according to an embodiment of the present invention. FIG. 1 (b) is a side view showing a tip of the plasma cutting torch. FIG. 3 is a view showing an arrow A. FIG. 3 is a conceptual view showing the entire configuration of a conventional plasma cutting apparatus. FIG. 4 is a cross-sectional view showing a tip of a conventional plasma cutting torch.
1a Heat-resistant insulating cylindrical handle 1b Pivot end 2a of handle Handle center shaft 2b Pivot shaft 3a Bearing hole 4 Torch body 4a Torch body center metal fitting 5a First connection member 5b Second connection member 5c Pin 6, 9 Coil spring 7 O-ring 8 Heat-resistant insulating sliding member

Claims (2)

A plasma cutting torch that can be used as a pencil-type or curved-type plasma cutting torch, wherein the pivotal end of a heat-resistant insulating cylindrical handle into which a pilot cable or a cooling cable is inserted is divided in half . A first connection member provided with a pair of bearing holes on a pivot shaft orthogonal to the central axis of the cylindrical handle, respectively fitted in the bearing holes of the heat-resistant insulating cylindrical handle, and connected to a cooling cable; A torch body is pivotally supported between a second connection member connected to a pilot cable and a pin mounted concentrically with a center of a bearing hole of the heat-resistant insulating cylindrical handle, and the torch body is connected to the first and second connection members. An elastic body such as a coil spring or a leaf spring for holding is mounted, and an O-ring for sealing the space between the torch body and the first connection member is provided. Plasma cutting torch to allow folding of Le and the torch body. To secure the handle and the torch body at an arbitrary angle, the outer circumference of the end portion of the handle or torch body while in a semicircle, the irregularities formed on the outer periphery of the semicircular, as fitted to the uneven 2. The plasma cutting torch according to claim 1, further comprising a heat-resistant insulating sliding member that is pressed and fixed via an elastic body such as a coil spring or a leaf spring.