CN2662593Y - Discharge device for cutting torch of plasma cutting machine - Google Patents

Abstract

The utility model relates to a discharge device for a cutting torch of a plasma cutting machine, which comprises a nozzle and a cathode which is arranged for matching the nozzle. A cathode filament isThe utility model discloses the discharge device of cutting torch of cutting machine of plasma and comprises a nozzle and a cathode that matches with the nozzle. The cathode wire is embedded into the embedded into a cathode end part, and the cathode end surface of the position which is provided with the cathode filament is concave inwards. The distance between the cathode side surface and the innend of the cathode and the cathode head face where the cathode wire is positioned is concave; the distance between the side surface of the cathode and the inner side surface of the nozzle is 0.5 to 3.er side surface of the nozzle is 0.5 to 1.5 m m, the concave-inward axial distance of the cathode end surface is 0 to 2 m m, and the distance (the draw-in quantity) between the cathode end surface and0 mm; the distance of inward bent cathode head face is 0 to 2 mm; the distance(neck-in value) between the head face of the cathode and the nozzle exit of the nozzle is 3 to 15 mm. The utility model ha a nozzle outlet of the nozzle is 3 to 15 m m. The discharge device of the utility model has good cutting effect, prolongs the cathode service life, and still can work continuously after the utility ms excellent cutting effect and the service life of the cathode. The utility model can work continuously for more than 7 hours. odel works continuously 7 hours.

Description

The electric discharge device of plasma cutter cutting torch

Affiliated technical field

The utility model relates to the electric discharge device in the cutting torch (cutting gun) in a kind of electroplating equipment wielding machine field, particularly a kind of plasma cutter.

Background technology

Plasma cutter be its cutting torch with gas ionizations such as air, oxygen, produce high-temperature plasma and make metal molten around it reach cutting function metal works.And make above-mentioned ionization as usual and what produce high-temperature plasma is that the electric discharge device of cutting torch comprises negative electrode and nozzle, form discharge cavity between negative electrode and nozzle, the cathode filament generation electronics of negative electrode makes as usual and produces high-temperature plasma in discharge cavity ionization, and sprays from the spout of nozzle.The cathode end that is embedded with cathode filament of the negative electrode of the cutting torch of existing plasma cutter is generally the ellipsoid taper, and the cathode filament region of discharge is in the tip of cathode end, and the inner surface of nozzle is the face of cylinder.The accumulative total working life of the negative electrode of this type of electric discharge device is very short, generally can only reach 2 hours even shorter, and is will loss intact because the cathode filament of this kind electric discharge device is easy to.Whole negative electrode can only be changed after the cathode filament loss to the greatest extent, because negative electrode accounts for significant proportion in the cutting torch cost, the user of therefore existing plasma cutter has increased production cost greatly because of the frequent negative electrode of changing, and the cutting power of this type of cutting machine is also relatively poor in addition.

Summary of the invention

The electric discharge device of the plasma cutter cutting torch that the novel purpose of this reality is a kind of negative electrode long service life of design, cutting efficiency is high.

The technical solution of the utility model is as follows: the electric discharge device of plasma cutter cutting torch, comprise a nozzle and a negative electrode that cooperates installation with it, form discharge cavity between the cathode end of negative electrode and the spout of nozzle, nozzle inner surface, described nozzle inner surface coning angle is 40～150 °, cathode filament embeds cathode end, and the nozzle inner surface is a taper seat; It is round table-like that cathode end is, and has the cathode-side surface and a disk shape negative electrode end face of a coning angle identical or close with the nozzle inner surface, the negative electrode end face indent of cathode filament present position; Distance is 0.5～3.0mm between cathode-side surface and nozzle inner surface; The axial distance of negative electrode end face indent is that the cathode terminal facial plane is 0～2mm to cathode filament table distance; Distance (neck-in) is 3～15mm between the spout exit face of negative electrode end face and spout.

According to electric discharge device of the present utility model, when work, form swirling eddy during narrow circular cone circular passage when gas enters discharge cavity between cathode-side surface and nozzle inner surface, and then be that interior turbulence type high temperature etc. exsomatizes and penetrates from spout by cathode filament ionization, speed is fast, temperature is high, good cutting effect; The shaped design of the utility model discharge cavity, the part of cathode filament loss (distillation) when discharge is fallen after rise to cathode filament, and the indent of negative electrode end face more helps the recovery of cathode filament loss part, therefore the accumulative total working life of cathode filament (negative electrode) prolongs greatly, and experiment detects and still can work on after more than 7 hour in the negative electrode continuous operation.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1. nozzle, 2. negative electrode, 3. discharge cavity, 4. cathode filament, 11. spouts, 111. spout exit faces, 12. nozzle inner surfaces, 21. cathode end, 211. cathode-side surface, 212. negative electrode end faces.

Embodiment

The utility model electric discharge device shown in Figure 1: nozzle 1 cooperates installation with negative electrode 2, the cathode end 21 of negative electrode 2 and the spout 11 of nozzle 1,12 of nozzle inner surfaces form discharge cavity 3, the cathode filament of being done by hafnium filament 4 embeds in the cathode end 21, nozzle inner surface 12 is a taper seat, its coning angle is 120 °, cathode end 21 is round table-like, cathode-side surface 211 and a disk shape negative electrode end face 212 with nozzle inner surface 12 identical 120 ° of coning angles is arranged, negative electrode end face 212 indents of 4 external positions of cathode filament; The distance that cathode-side surface 211 and nozzle inner surface are 12 is 1mm; The axial distance of negative electrode end face 212 folkways and customs is the cathode terminal facial plane to the distance on cathode filament 4 surfaces is 1mm; The distance (being commonly called as neck-in) that the spout exit face of negative electrode end face 212 and spout 11 is 111 is 10mm.

Claims (1)

1. the electric discharge device of plasma cutter cutting torch, comprise a nozzle (1) and a negative electrode (2) that cooperates installation with it, form discharge cavity (3) between the cathode end (21) of negative electrode (2) and the spout (11) of nozzle (1), nozzle inner surface (12), nozzle inner surface (12) coning angle is 40～150 °, cathode filament (4) embeds cathode end (21), and it is characterized in that: nozzle inner surface (12) is a taper seat; Cathode end (21) is round table-like, has the cathode-side surface (211) and a disk shape negative electrode end face (212) of a coning angle identical or close with nozzle inner surface (12), negative electrode end face (212) indent of cathode filament (4) present position; Distance between cathode-side surface (211) and nozzle inner surface (12) is 0.5～3.0mm; The axial distance of negative electrode end face (212) indent is that the cathode terminal facial plane is 0～2mm to the surperficial distance of cathode filament (4); Distance (neck-in) between the spout exit face (111) of negative electrode end face (212) and spout (11) is 3～15mm.

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