CN2164940Y

CN2164940Y - Pressure-controllable plasma cutting and welding torch

Info

Publication number: CN2164940Y
Application number: CN 93221259
Authority: CN
Inventors: 黄煌南
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-08-12
Filing date: 1993-08-12
Publication date: 1994-05-18
Anticipated expiration: 2003-08-12

Abstract

The utility model relates to a pressure-controllable plasma cutting and welding torch. The inner part of a torch body is sheathed with a cathode sleeve, the lower part of the cathode sleeve is connected with a cathode terminal, the inner part of the cathode sleeve is sheathed with a gas guiding core pipe, and the outer part of the cathode sleeve is sheathed with an insulating body. The outer part of the insulating body is provided with an anode sleeve which is overlapped and connected with the anode of a power supply, and the outer part of the anode sleeve is an outer insulating body. The lower part of the outer insulating body is connected with a nozzle which is contained outside the cathode terminal at intervals. A main exhaust passage is arranged between the inner cavity of the nozzle and the cathode terminal, and an overpressure exhaust valve is arranged between the gas guiding core pipe and the cathode sleeve. When the exhaust valve is closed, gas is led to the nozzle. When the pressure exceeds the predetermined value, the gas valve is opened, part of gas is discharged from the torch body and the equilibrium of pressure is obtained.

Description

Pressure-controllable plasma cutting and welding torch

The utility model relates to a kind of cutting, solder set, particularly a kind of controllable pressure plasma torch for cutting and welding.

The operation principle of present plasma torch for cutting and welding is: the plasma gas flame stream that goes out high concentration through nozzle ejection cuts workpiece or weld, plasma gas then is ionizable by the effect of the positive and negative electrode of nozzle and cathode terminal, the whole process of ejection does not all have pressure control from air inlet to gas, therefore, when admission pressure changes, will the influence nozzle pressure of gas flame stream of ejection change, this pressure variation then directly causes cutting weldering gas flow rate degree, the fluctuation of concentration, the quality and the efficient of cutting weldering had both been influenced, cause the instability of cutting in the weldering process again, promptly cause being cut, the welding work pieces heating temperature, the difference of time, the distortion that workpiece is produced, metal lattice is subjected to unbalanced stress even in advance, make the deflection of processed parts, internal stress strengthens or is unbalanced, not only processing has brought difficulty to postorder, also has influence on the quality in its dimensional accuracy and the later stage use.

The purpose of this utility model just is to overcome the above-mentioned shortcoming and defect of existing in prior technology, and a kind of superpressure air bleeding valve that is provided with, the controllable plasma torch for cutting and welding of output pressure are provided.

The purpose of this utility model is to realize by following technical scheme: in rifle body internal sleeve cathode sleeve is housed, the cathode sleeve bottom is connected with cathode terminal, be set with air guide core pipe in the cathode sleeve, the cathode sleeve outer cover is provided with insulator, insulator has an anode sleeve pipe that connects with positive source outward, the anode sleeve pipe is outward an outer insulator, be connected with the nozzle that an interval is included in the cathode terminal outside in the outer insulator bottom, it between nozzle chamber and the cathode terminal main exhaust passageway, be provided with the superpressure air bleeding valve between air guide core pipe and the cathode sleeve, during exhaust valve closure, gas leads to nozzle, when surpassing the predetermined value air valve, pressure is unlocked, it is external that portion gas is discharged rifle, to reach the balance of pressure.

Therefore: remarkable result of the present utility model is:

First: when pressure surpasses setting value, can discharge by the superpressure air bleeding valve, so can remain the pressure of nozzle operation stream, the stability of flow velocity, to raising cut weldering efficient, to improve the workpiece to be machined quality very favourable, and significant minimizing effect and even effect are arranged to cutting internal stress that weldment produces and distortion, can make and cut weldment in post-production and more convenient, more durable in using.

Second: the unnecessary air-flow of being discharged after the excess around the nozzle the ejection of rifle body and around the main body flame stream of nozzle ejection, form the shield gas flow layer, this airflow layer has the effect of cutting the solder joint surrounding space of isolating, can play insulation effect, have again and purify the shielding action cut the solder joint environment, weldering efficient, anti-oxidation and raising are cut in raising, and to cut the weldering quality all beneficial.

Concrete structure of the present utility model is realized by the following examples and accompanying drawing thereof:

Fig. 1 is a section of structure of the present utility model.

Operation principle schematic diagram when Fig. 2 is the utility model exhaust.

Below in conjunction with accompanying drawing 1-2 concrete structure of the present utility model is described in detail:

In rifle body 1 internal sleeve the cathode sleeve 2 that introducing is cut weldering gas and linked to each other with power cathode is housed, cathode sleeve 2 bottoms are connected with cathode terminal 4, be set with the air guide core pipe 3 of hollow in the cathode sleeve 2, the cathode sleeve 2 outer interior insulators 8 that are set with, there is an anode sleeve pipe 5 that is connected with outer insulator 9 endoporus interior insulator 8 outsides, anode sleeve pipe 5 overlaps mutually with positive source, one leading runner 20 is arranged between cathode sleeve 2 endoporus and air guide core pipe 3 outer surfaces, leading runner 20 connects with the discharge space passage 60 and the nozzle bore 63 of negative electrode suit 2 outsides, between cathode sleeve 2 and air guide core pipe 3, be movably set with superpressure air bleeding valve 7 in the ring cavity, the pressure release passage of offering in superpressure air bleeding valve 7 sealing that contacts with the superpressure steam vent 24 that cathode sleeve 2 stage casings are offered, superpressure steam vent 24 and interior insulator 8 83 is conducted.Referring to Fig. 1 and Fig. 2

Architectural feature of the present utility model also is:

Cathode sleeve 2 is fixedly set in the centre bore 11 of rifle body 1, epimere week is outwards visited to stretch in the cathode sleeve 2 air inlet pipe 21, air inlet pipe 21 is connected with power cathode, the screw of cathode sleeve 2 epimeres 22 screws mutually with the epimere 31 of air guide core pipe 3, the hole matches along the following peripheral with superpressure air bleeding valve 7 and seals or the disengaging conducting on the stage casing 23 of cathode sleeve 2, primary air exhaust outlet 25 be opened in hypomere in the cathode sleeve 2 circumferentially and the discharge space passage 60 and the nozzle bore 63 in the major flow passage 20 inboard and its outside with it connect, the hypomere 26 of cathode sleeve 2 and cathode terminal 4 company of twisting and interval mutually are included in air guide core pipe 3 outsides.Referring to Fig. 1

Air guide core pipe 3 circumferentially offers annular groove 321 with air inlet pipe 21 corresponding sections, vertically offer a central gas port 33 along air guide core pipe 3, central authorities gas port 33 tops and blowhole 32 are conducted, blowhole 32 connects with annular groove 321, central authorities gas port 33 lower ends are the logical gas outlet 34 of slitting, gas outlet 34 and air guide core pipe 2 hypomere outer surfaces reach and the cathode sleeve 2 of its outer suit in leading runner 20 between the hypomere inner surface be conducted.Referring to Fig. 1

Twist in the centre bore 11 epimere endoporus of rifle body 1 and be placed with capping 12, epimere 31 top center have a stubborn tool to disclose into groove 311, the one radially evagination and the bulge loop 35 of joining with cathode sleeve 2 endoporus slip caps respectively arranged in annular groove 321 top and the bottom of air guide core pipe 3, between valve plug 71 upper ring surfaces of the bottom of bottom bulge loop 35 and superpressure air bleeding valve 7, be equipped with a spring 72, valve plug 71 is with air guide core pipe 3 movable sets and by spring 72 roof pressures upper edge in the aperture in the stage casing 23 of

cathode sleeve

2,71 times anchor rings of valve plug act on mutually with gas pressure in the leading runner 20, and spring 72 equals to flow to the size of setting pressure Kg of the primary air of nozzle 6 against the size of the pressure Ks of valve plug 71.Referring to Fig. 1

Cathode terminal 4 V-shaped hollow forms, have on cathode terminal top one with cathode sleeve 2 lower ends 26 thread segment 41 of the company of twisting mutually, the thread segment bottom of cathode terminal 4 is the bullet caps 42 that wrap in 3 times outsides of air guide core pipe that enclose of a up big and down small hollow form, and a leading runner 20 is arranged between air guide core pipe 3 lower external face and cathode terminal 4 surface of internal cavity.Referring to Fig. 1

Anode sleeve pipe 5 is even stubborn mutually with outer insulator 9 that forms rifle body 1 hypomere 13 and insulation helmet 91, the middle hypomere 52 of anode sleeve pipe 5 and in it and and interior insulator 8 hypomere outer surfaces between form a pressure release passage 83, the circumferential evagination in cathode sleeve 5 tops has an anode connection that is connected with positive source or bonding 51, the convex collar 53 of anode sleeve pipe 5 connects with the epimere external thread section 61 of nozzle 6 is stubborn mutually, offer spaced bleeder port 54 at the convex collar 53 periphery horizontal plate parts, the disappointing ring cavity 92 of a tapered interior closing in shape is arranged at bleeder port 54 bottoms.Referring to Fig. 1

Embedding accompanies insulation body 8 between anode sleeve pipe 5 and the cathode sleeve 2, in insulation body 8 have one with the cathode sleeve 2 cylindricals endoporus 81 of suit mutually, endoporus 81 hypomeres are an endoporus section 82 that radially enlarges, one ring cavity that connects with the discharge space circular passage 60 of primary air outlet 25 and bottom is arranged between endoporus section 82 and the cathode sleeve 2 hypomere outer surfaces, interior insulation body 8 stage casings are along having the shoulder hole 84 that communicates with superpressure steam vent 24 on every side, and the pressure release passage 83 between the reduced diameter section outer surface of shoulder hole 84 and anode sleeve pipe 5 endoporus and interior insulation body 8 hypomeres is conducted.Referring to Fig. 1

Anode sleeve pipe 5 cylindricals of tubular are provided with external insulation body 9 and twist the screw thread that closes mutually, external insulation body 9 is parts of rifle body 1, the insulation helmet cover 91 of closing in shape in one taper is arranged at external insulation body 9 bottoms, the ring cavity 92 that loses heart is positioned at the neighboring of the center of orifices 63 of nozzle 6, and nozzle 6 inner chambers are warhead shape, there is a conical section 62 its outside.Referring to Fig. 1

Operation principle of the present utility model is: referring to Fig. 1 and Fig. 2

Gas G introduces from air inlet pipe 21, export in 25 flow channels 60 through annular groove 321, blowhole 32, gas port 33, gas outlet 34, major flow passage 20, primary air, through between the positive and negative electrode of nozzle 6 and cathode terminal 4, be ionized during passage 60 then, after spray orifice 63 ejects at a high speed, the electricity slurry flame flow Go of high concentration is to work package W, to finish cutting or weld job.

When main gas G pressure surpasses 3.5kg/cm ²The time, air-flow then upwards boosts valve plug 71, the electricity that excess gas is then penetrated around spray orifice 63 by superpressure steam vent 24,

pressure release passage

83,92 effusions of disappointing ring cavity and telogenesis is starched the shroud gas layer of flame flow Go, with starvation, avoid cutting the oxidation of weldering place, improve and cut the weldering quality, simultaneously, the shroud gas layer also has the effect of cooling jet 6 and blows the effect of bits quarrel clearly.Can keep cutting the presentation quality of weld bond.Referring to Fig. 2

When pressure is less than or equal to 3.5kg/cm ², promptly spring pressure is greater than gas pressure, and valve plug auto-closing, air-flow all pass through through the nozzle position.So can guarantee to cut air-flow stable of weldering process.

Adjust preset pressure as need, the 1 top capping 12 of rifle body can be taken off, turn groove 311 with the bar awl, the dish 31 that screws of evagination on the epimere 31 is vertically rotated up or down, compress the size of the axial distance of spring 72 to change bulge loop 35 bottoms, reach the purpose of adjusting 72 pairs of valve plug 71 pressure sizes of spring, therefore, can reach at last by cutting weldering and need set the purpose of stream pressure.

Claims

1, controllable pressure plasma torch for cutting and welding, it is characterized in that: be equipped with in rifle body (1) internal sleeve and introduce the cathode sleeve (2) of cutting weldering gas and linking to each other with power cathode, cathode sleeve (2) bottom is connected with cathode terminal (4), be set with the air guide core pipe (3) of hollow in the cathode sleeve (2), the outer interior insulator (8) that is set with of cathode sleeve (2), there is an anode sleeve pipe (5) that is connected with outer insulator (9) endoporus interior insulator (8) outside, anode sleeve pipe (5) overlaps mutually with positive source, one leading runner (20) is arranged between cathode sleeve (2) endoporus and air guide core pipe (3) outer surface, leading runner (20) connects with the discharge space passage (60) and the nozzle bore (63) of negative electrode suit (2) outside, between cathode sleeve (2) and air guide core pipe (3), be movably set with superpressure air bleeding valve (7) in the ring cavity, the pressure release passage of offering in superpressure air bleeding valve (7) sealing that contacts with the superpressure steam vent (24) that cathode sleeve (2) stage casing is offered, superpressure steam vent (24) and interior insulator (8) (83) is conducted.

2, according to the described controllable pressure plasma torch for cutting and welding of claim 1, it is characterized in that: cathode sleeve (2) is fixedly set in the centre bore (11) of rifle body (1), epimere week is outwards visited to stretch in the cathode sleeve (2) an air inlet pipe (21), air inlet pipe (21) is connected with power cathode, the screw of cathode sleeve (2) epimere (22) screws mutually with the epimere (31) of air guide core pipe (3), last hole, the stage casing (23) of cathode sleeve (2) matches along the following peripheral with superpressure air bleeding valve (7) and seals or the disengaging conducting, primary air exhaust outlet (25) is opened in circumferential and inboard with it the major flow passage (20) of the middle hypomere of cathode sleeve (2) and the discharge space passage (60) and the nozzle bore (63) in its outside connects, and the hypomere (26) of cathode sleeve (2) and cathode terminal (4) company of twisting mutually also are included in air guide core pipe (3) outside in the interval.

3, according to the described controllable pressure plasma torch for cutting and welding of claim 1, it is characterized in that: air guide core pipe (3) circumferentially offers annular groove (321) with air inlet pipe (21) corresponding section, vertically offer a central gas port (33) along air guide core pipe (3), central authorities gas port (33) top and blowhole (32) are conducted, blowhole (32) connects with annular groove (321), central authorities gas port (33) lower end is the logical gas outlet (34) of slitting, gas outlet (34) and air guide core pipe (2) hypomere outer surface and and the middle hypomere inner surface of cathode sleeve (2) of its outer suit between leading runner (20) be conducted.

4, according to the described controllable pressure plasma torch for cutting and welding of claim 1, it is characterized in that: twist in centre bore (11) the epimere endoporus of rifle body (1) and be placed with capping (12), epimere (31) top center has a stubborn tool to disclose into groove (311), the one radially evagination and the bulge loop (35) of joining with cathode sleeve (2) endoporus slip cap respectively arranged in annular groove (321) top and the bottom of air guide core pipe (3), between valve plug (71) upper ring surface of the bottom of bottom bulge loop (35) and superpressure air bleeding valve (7), be equipped with a spring (72), valve plug (71) is with air guide core pipe (3) movable set and by spring (72) roof pressure upper edge in the aperture in the stage casing (23) of cathode sleeve (2), valve plug (71) the down interior gas pressure of anchor ring and leading runner (20) acts on mutually, and spring (72) equals to flow to the size of setting pressure Kg of the primary air of nozzle (6) against the size of the pressure Ks of valve plug (71).

5, according to claim 1 or 2 described controllable pressure plasma torch for cutting and welding, it is characterized in that: the V-shaped hollow form of cathode terminal (4), have on cathode terminal top one with cathode sleeve (2) lower end (26) thread segment (41) of the company of twisting mutually, the thread segment bottom of cathode terminal (4) is that up big and down small enclosing of hollow form wraps in bullet cap (42) outside under the air guide core pipe (3), and a leading runner (20) is arranged between air guide core pipe (3) lower external face and cathode terminal (4) surface of internal cavity.

6, according to the described controllable pressure plasma torch for cutting and welding of claim 1, it is characterized in that: anode sleeve pipe (5) is even stubborn mutually with outer insulator (9) that forms rifle body (1) hypomere (13) and insulation helmet (91), the middle hypomere (52) of anode sleeve pipe (5) and be positioned at its and and insulator (8) hypomere outer surface between form a pressure release passage (83), the circumferential evagination in cathode sleeve (5) top has an anode connection that is connected with positive source or bonding (51), the convex collar (53) of anode sleeve pipe (5) connects with the epimere external thread section (61) of nozzle (6) is stubborn mutually, offer spaced bleeder port (54) at the convex collar (53) periphery horizontal plate part, the disappointing ring cavity (92) of a tapered interior closing in shape is arranged at bleeder port (54) bottom.

7, according to claim 2 or 6 described controllable pressure plasma torch for cutting and welding, it is characterized in that: embedding accompanies insulation body (8) between anode sleeve pipe (5) and the cathode sleeve (2), in insulation body (8) have one with cathode sleeve (2) the cylindrical endoporus of suit (81) mutually, endoporus (81) hypomere is an endoporus section (82) that radially enlarges, one ring cavity that connects with the discharge space circular passage (60) of primary air outlet (25) and bottom is arranged between endoporus section (82) and cathode sleeve (2) the hypomere outer surface, interior insulation body (8) stage casing is along having the shoulder hole (84) that communicates with superpressure steam vent (24) on every side, and the pressure release passage (83) between the reduced diameter section outer surface of shoulder hole (84) and anode sleeve pipe (5) endoporus and interior insulation body (8) hypomere is conducted.

8, according to the described controllable pressure plasma torch for cutting and welding of claim 7, it is characterized in that: anode sleeve pipe (5) cylindrical of tubular is provided with external insulation body (9) and twists the screw thread that closes mutually, external insulation body (9) is the part of rifle body (1), the insulation helmet cover (91) of closing in shape in one taper is arranged at external insulation body (9) bottom, the ring cavity (92) that loses heart is positioned at the neighboring of the center of orifices (63) of nozzle (6), and nozzle (6) inner chamber is warhead shape, there is a conical section (62) its outside.