Plasma arc welding gun

Abstract

The plasma arc welding gun comprises a nozzle seat, a tungsten electrode positioning hole is formed in the center of the top of the nozzle seat, a steel pipe is installed at the top of the tungsten electrode positioning hole in an internal thread mode, a water inlet waterway assembly and a water outlet waterway assembly are further installed at the top of the nozzle seat in an internal thread mode, and an outer cover pipe is installed on the outer edge of the top of the nozzle seat in a thread mode. A compression nozzle mechanism is installed at the bottom of the nozzle seat, and the water inlet waterway assembly and the water outlet waterway assembly are communicated through the nozzle seat and the compression nozzle mechanism. The arc starting effect can be achieved without sharpening the tungsten electrode, the service life of the tungsten electrode is greatly prolonged, meanwhile, a transferred arc mode is not adopted, welding double arcs are avoided, the probability that a nozzle is burnt out is reduced, and the quality of the welding process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plasma arc welding, in particular to a plasma arc welding gun. Background Art

[0002] Plasma arc welding refers to a fusion welding method that uses the high energy density beam of plasma arc as the welding heat source. Plasma arc welding has the characteristics of concentrated energy, high productivity, fast welding speed, small stress and deformation, stable arc and suitable for welding thin plates and box materials. It is particularly suitable for welding various refractory, easily oxidized and heat-sensitive metal materials (such as tungsten, molybdenum, copper, nickel, titanium, etc.).

[0003] Plasma arc welding in the prior art has the following disadvantages:

[0004] 1. The arc starting temperature is low, the tungsten electrode needs to be sharpened, and the transfer arc is used to ensure the arc starting effect of the plasma arc, which affects the service life of the tungsten electrode.

[0005] 2. When using the transfer arc, if the nozzle is damaged after repeated use, a series arc will be generated between the tungsten electrode, nozzle and workpiece. This side arc and transfer arc exist at the same time, which is called a double arc. The generation of a double arc indicates that the cooling air film between the arc column and the nozzle has been destroyed, and the transfer arc current has decreased, which will lead to abnormal welding process and even burn out the nozzle quickly.

[0006] Therefore, in view of the shortcomings of the prior art, it is necessary to provide a plasma arc welding gun to solve the shortcomings of the prior art. Utility Model Content

[0007] The utility model aims to avoid the deficiencies of the prior art and provide a plasma arc welding gun, which further improves the arc starting effect by compressing the arc starting channel to compress the arc at the molten part of the tungsten electrode through the compression part, and can meet the arc starting effect without sharpening the tungsten electrode, thereby greatly improving the service life of the tungsten electrode. At the same time, the transfer arc method is not adopted, thereby avoiding the occurrence of double arc welding, reducing the probability of the nozzle being burned out, and improving the quality of the welding process.

[0008] The above-mentioned purpose of the utility model is achieved through the following technical means.

[0009] Provided is a plasma arc welding torch, comprising a nozzle seat, a tungsten electrode positioning hole is provided at the center of the top of the nozzle seat, a steel pipe is installed on the top internal thread of the tungsten electrode positioning hole, a water inlet waterway assembly and a water outlet waterway assembly are installed on the top internal thread of the nozzle seat, an outer cover pipe is installed on the top outer edge of the nozzle seat, a compression nozzle mechanism is installed on the bottom of the nozzle seat, and the water inlet waterway assembly and the water outlet waterway assembly are connected through the nozzle seat and the compression nozzle mechanism;

[0010] The compression nozzle mechanism includes a connecting threaded sleeve and a lower nozzle. The connecting threaded sleeve is threadedly sleeved on the outside of the nozzle seat below the nozzle seat. A limiting clamp is provided at the bottom of the nozzle seat. A positioning outer ring is provided at the top of the lower nozzle. The positioning outer ring cooperates with the limiting clamp to clamp the lower nozzle under the connecting threaded sleeve. A through-hole insulating pad is installed between the top of the lower nozzle and the nozzle seat. A compression arc starting channel is provided inside the lower nozzle. A tungsten pole clamp is installed on the inner thread of the bottom of the steel pipe, and the bottom of the tungsten pole clamp extends to the compression arc starting channel.

[0011] Specifically, the compression arc starting channel is connected from top to bottom and is located in the center of the lower nozzle. The compression arc starting channel is provided with a front section, a compression section and an ejection section from top to bottom. A tungsten electrode is installed inside the tungsten electrode frame, and the bottom of the tungsten electrode and the tungsten electrode clamp are both located inside the compression section.

[0012] Preferably, the side cross-section of the compression section is trapezoidal, the top diameter of the compression section is larger than the bottom diameter, and the taper of the compression section is 40-50.

[0013] Specifically, the distance D1 between the bottom of the tungsten electrode and the top of the ejection section is 3 mm to 5 mm.

[0014] Furthermore, the water inlet waterway component includes a water inlet ceramic tube and a water inlet plastic tube that are plugged and installed, the water outlet waterway component includes a water outlet ceramic tube and a water outlet plastic tube, the interior of the nozzle seat is provided with a water inlet through hole and a water outlet through hole, the top of the water inlet through hole is threadedly connected to the water inlet ceramic tube, the top of the water outlet through hole is threadedly connected to the water outlet ceramic tube, and the bottoms of the water inlet plastic tube and the water outlet plastic tube both extend out of the top of the outer cover tube.

[0015] Specifically, a water flow annular groove is opened inside the lower nozzle, the water inlet hole and the water outlet hole are connected through the water flow annular groove, and the water inlet waterway assembly, the water inlet hole, the water flow annular groove, the water outlet hole and the water outlet waterway assembly are connected to form a circulating cooling waterway.

[0016] The utility model further improves the arc starting effect by compressing the arc starting channel to compress the arc at the molten part of the tungsten electrode through the compression part. The arc starting effect can be met without sharpening the tungsten electrode, which greatly increases the service life of the tungsten electrode. At the same time, the transfer arc method is not adopted, which avoids the occurrence of double arc welding, reduces the probability of nozzle burning, and improves the quality of the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0018] Figure 1 The utility model is a schematic diagram of the side structure of a plasma arc welding gun.

[0019] Figure 2This is a side view cross-sectional diagram of a plasma arc welding gun of the utility model. Figure 1 .

[0020] Figure 3 This is a side view cross-sectional diagram of a plasma arc welding gun of the utility model. Figure 2 .

[0021] Figure 4 The utility model is a plasma arc welding gun Figure 3 A is an enlarged schematic diagram.

[0022] Figure 5 The utility model is a schematic diagram of a top view structure of a plasma arc welding gun.

[0023] from Figures 1 to 5 Including:

[0024] 1. Nozzle seat;

[0025] 2. Tungsten electrode positioning hole;

[0026] 3. Steel pipe;

[0027] 4. Water inlet waterway components;

[0028] 5. Water outlet waterway components;

[0029] 6. Outer cover tube;

[0030] 7. Compression nozzle mechanism;

[0031] 8. Connect the threaded casing;

[0032] 9. Lower nozzle;

[0033] 10. Limiting clamp;

[0034] 11. Position the outer ring;

[0035] 12. Through hole insulation pad;

[0036] 13. Compress the arc starting channel;

[0037] 14. Tungsten electrode clamp;

[0038] 15. The first part;

[0039] 16. Compression section;

[0040] 17. Spraying section;

[0041] 18. Tungsten electrode;

[0042] 19. Water inlet ceramic pipe;

[0043] 20. Water inlet plastic pipe;

[0044] 21. Water outlet ceramic pipe;

[0045] 22. Water outlet plastic pipe;

[0046] 23. Water inlet hole;

[0047] 24. Water outlet hole;

[0048] 25. Water flow ring groove. DETAILED DESCRIPTION

[0049] The utility model is further described in conjunction with the following embodiments.

[0050] Example 1.

[0051] like Figure 1-5 As shown, a plasma arc welding gun includes a nozzle seat 1, a tungsten electrode 18 positioning hole 2 is provided in the center of the top of the nozzle seat 1, a steel pipe 3 is installed on the top internal thread of the tungsten electrode 18 positioning hole 2, an inlet waterway assembly 4 and an outlet waterway assembly 5 are installed on the top internal thread of the nozzle seat 1, an outer cover pipe 6 is installed on the top outer edge of the nozzle seat 1, a compression nozzle mechanism 7 is installed on the bottom of the nozzle seat 1, and the inlet waterway assembly 4 and the outlet waterway assembly 5 are connected through the nozzle seat 1 and the compression nozzle mechanism 7.

[0052] The steel pipe 3 is fixed by the nozzle seat 1, and the steel pipe 3 is connected and installed with the tungsten electrode 18 clamp 14, and then connected to the negative pole of the power supply through the steel pipe 3. The water inlet waterway assembly 4, the water outlet waterway assembly 5 and the steel pipe 3 can be fixed by the outer cover tube 6, and fixedly connected to the nozzle seat 1. The water inlet waterway assembly 4 and the water outlet waterway assembly 5 are connected through the nozzle seat 1 and the compression nozzle mechanism 7 to form a circulating cooling waterway.

[0053] The compression nozzle mechanism 7 includes a connecting threaded sleeve 8 and a lower nozzle 9. The connecting threaded sleeve 8 is threadedly sleeved on the outside of the nozzle seat 1 below the nozzle seat 1. A limiting clamping ring 10 is provided at the bottom of the nozzle seat 1, and a positioning outer ring 11 is provided at the top of the lower nozzle 9. The positioning outer ring 11 cooperates with the limiting clamping ring 10 to clamp the lower nozzle 9 under the connecting threaded sleeve 8. A through-hole insulating pad 12 is installed between the top of the lower nozzle 9 and the nozzle seat 1. A compression arc starting channel 13 is provided inside the lower nozzle 9. A tungsten electrode 18 clamp 14 is installed on the inner thread of the bottom of the steel pipe 3, and the bottom of the tungsten electrode 18 clamp 14 extends to the compression arc starting channel 13.

[0054] The compression nozzle mechanism 7 can fix the lower nozzle 9 to the nozzle seat 1 by pre-inserting the lower nozzle 9 into the inside of the connecting threaded sleeve 8, and then screwing the threaded sleeve on the outside of the nozzle seat 1. The through-hole insulating pad 12 can insulate and block the access of the positive and negative poles of the power supply. The tungsten pole 18 clamp 14 is screwed on the bottom of the steel pipe 3 and extends to the compression arc starting channel 13 through the tungsten pole 18 positioning hole 2. The tungsten pole 18 is clamped inside, and the arc is started inside the compression arc starting channel 13. The positive pole of the power supply is connected to the lower nozzle 9. The power supply needs to be a 110v, 500A plasma power supply.

[0055] The compression arc starting channel 13 is connected from top to bottom and is located in the center of the lower nozzle 9. The compression arc starting channel 13 is provided with a front section 15, a compression section 16 and an ejection section 17 from top to bottom. A tungsten pole 18 is installed inside the tungsten pole 18 frame. The bottom of the tungsten pole 18 and the tungsten pole 18 clamp 14 are both located inside the compression section 16.

[0056] The interior of the compressed arc striking channel 13 is used for placing the tungsten pole 18 clamp 14 through the front section 15 , and then arc striking compression is performed through the compression section 16 to obtain greater arc striking energy, which is then ejected from the ejection section 17 .

[0057] The side cross-section of the compression section 16 is trapezoidal, the top diameter of the compression section 16 is larger than the bottom diameter, and the taper of the compression section 16 is 40-50 degrees.

[0058] The taper of the compression section 16 is 40-50. In this embodiment, the taper of the compression section 16 is 47. The top diameter of the compression section 16 is 1.5-2 times the bottom diameter.

[0059] The distance D1 between the bottom of the tungsten electrode 18 and the top of the ejection section 17 is 3 mm to 5 mm.

[0060] The water inlet waterway assembly 4 includes a water inlet ceramic tube 19 and a water inlet plastic tube 20 which are plugged and installed, and the water outlet waterway assembly 5 includes a water outlet ceramic tube 21 and a water outlet plastic tube 22. The interior of the nozzle seat 1 is provided with a water inlet through hole 23 and a water outlet through hole 24. The top of the water inlet through hole 23 is threadedly connected to the water inlet ceramic tube 19, and the top of the water outlet through hole 24 is threadedly connected to the water outlet ceramic tube 21. The bottoms of the water inlet plastic tube 20 and the water outlet plastic tube 22 both extend out of the top of the outer cover tube 6.

[0061] The water inlet ceramic tube 19 and the water outlet ceramic tube 21 can be insulated and conveniently connected to the plastic hose.

[0062] A water flow annular groove 25 is provided inside the lower nozzle 9, the water inlet hole 23 and the water outlet hole 24 are connected via the water flow annular groove 25, and the water inlet waterway assembly 4, the water inlet hole 23, the water flow annular groove 25, the water outlet hole 24 and the water outlet waterway assembly 5 are connected to form a circulating cooling waterway.

[0063] The circulating cooling water channel runs through the entire plasma arc welding torch and is connected at the bottom through the water flow ring groove 25 to achieve large-area heat dissipation and cooling.

[0064] The utility model further improves the arc starting effect by compressing the arc starting channel 13 to compress the arc at the molten part of the tungsten electrode 18. The arc starting effect can be achieved without sharpening the tungsten electrode 18, which greatly improves the service life of the tungsten electrode 18. At the same time, the transfer arc method is not adopted, which avoids the occurrence of double arc welding, reduces the probability of the nozzle being burned out, and improves the quality of the welding process.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the protection scope of the utility model. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A plasma arc welding gun, characterized in that: It comprises a nozzle seat, a tungsten electrode positioning hole is provided at the center of the top of the nozzle seat, a steel pipe is installed on the internal thread of the top of the tungsten electrode positioning hole, an inlet waterway assembly and an outlet waterway assembly are installed on the internal thread of the top of the nozzle seat, an outer cover pipe is installed on the top outer edge of the nozzle seat, a compression nozzle mechanism is installed on the bottom of the nozzle seat, and the inlet waterway assembly and the outlet waterway assembly are connected through the nozzle seat and the compression nozzle mechanism; The compression nozzle mechanism includes a connecting threaded sleeve and a lower nozzle, the connecting threaded sleeve is threadedly sleeved on the outside of the nozzle seat below the nozzle seat, a limiting clamping ring is provided at the bottom of the nozzle seat, and a positioning outer ring is provided at the top of the lower nozzle, the positioning outer ring cooperates with the limiting clamping ring to clamp the lower nozzle under the connecting threaded sleeve, a through-hole insulating pad is installed between the top of the lower nozzle and the nozzle seat, a compression arc starting channel is provided inside the lower nozzle, a tungsten pole clamp is installed on the inner thread of the bottom of the steel pipe, and the bottom of the tungsten pole clamp extends to the compression arc starting channel.

2. A plasma arc welding torch according to claim 1, characterized in that: The compression arc starting channel is connected from top to bottom and is located in the center of the lower nozzle. The compression arc starting channel is provided with a front section, a compression section and an ejection section from top to bottom. A tungsten electrode is installed inside the tungsten electrode frame. The tungsten electrode and the bottom of the tungsten electrode clamp are both located inside the compression section.

3. A plasma arc welding torch according to claim 2, characterized in that: The side view cross section of the compression section is trapezoidal, the top diameter of the compression section is larger than the bottom diameter, and the taper of the compression section is 40-50.

4. A plasma arc welding torch according to claim 3, characterized in that: The distance D1 between the bottom of the tungsten electrode and the top of the ejection section is 3 mm to 5 mm.

5. A plasma arc welding torch according to claim 4, characterized in that: The water inlet waterway assembly includes a water inlet ceramic tube and a water inlet plastic tube that are plugged and installed, the water outlet waterway assembly includes a water outlet ceramic tube and a water outlet plastic tube, the interior of the nozzle seat is provided with a water inlet through hole and a water outlet through hole, the top of the water inlet through hole is threadedly connected to the water inlet ceramic tube, the top of the water outlet through hole is threadedly connected to the water outlet ceramic tube, and the bottoms of the water inlet plastic tube and the water outlet plastic tube both extend out of the top of the outer cover tube.

6. A plasma arc welding torch according to claim 5, characterized in that: A water flow annular groove is provided inside the lower nozzle, the water inlet through hole and the water outlet through hole are connected via the water flow annular groove, and the water inlet waterway assembly, the water inlet through hole, the water flow annular groove, the water outlet through hole and the water outlet waterway assembly are connected to form a circulating cooling waterway.

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