Plasma surfacing welding gun

Abstract

The utility model relates to the technical field of welding equipment, in particular to a plasma surfacing welding gun. The gun body and the cover body are sleeved with an insulating protective shell, a nozzle hole is formed in the center of the cover body, a tungsten electrode chuck is installed on the tungsten electrode tail cap, a tungsten needle penetrates through the center of the tungsten electrode chuck, one end of the tungsten needle is in transition fit with the tungsten electrode tail cap, and the tip of the other end of the tungsten needle extends to the nozzle hole. One side of the gun body is connected with a water inlet pipe, a water outlet pipe, a first powder inlet pipe, a second powder inlet pipe, a plasma gas inlet pipe and a protective gas inlet pipe, a first water channel with one end communicated with the water inlet pipe is arranged in the gun body, and a second water channel with one end communicated with the other end of the first water channel is arranged in the cover body. A third water channel with one end communicated with the water outlet pipe and the other end communicated with the second water channel is further arranged in the gun body; after the prior art is improved, only one water inlet pipe and one water outlet pipe need to be arranged to form a cooling water circulation loop in the gun body and the cover body, the structure is relatively simple, and the occupied external space is small.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a plasma surfacing torch. Background Art

[0002] Plasma powder surfacing uses a plasma arc as a heat source. The high temperature generated by the plasma arc rapidly heats the alloy powder and the substrate surface together and melts, mixes, diffuses, and solidifies them. After the plasma beam leaves, it cools itself, forming a high-performance alloy layer, thereby realizing the surfacing process of strengthening and hardening the surface of parts. As an important technology in the field of modern surface engineering, plasma surfacing technology is widely used in many industries such as aerospace, automobile manufacturing, energy, and chemical industry due to its characteristics of high efficiency, precision, and strong controllability. The plasma surfacing torch, as the core component of this technology, its design and performance directly affect the quality and efficiency of the surfacing process.

[0003] In view of this, a Chinese patent document with the publication number CN2430240Y discloses a plasma surfacing torch with high deposition rate and low dilution rate, including a tungsten electrode gap screw, a tungsten electrode clamp, a guide card, a gun body cover, an upper gun body, an insulating ring, a lower gun body cover, a lower gun body, a gas combing ring, a nozzle, a water separation plate, a lower gun body water jacket ring, an insulating sleeve, a gas equalizing ring, a lower gun body sleeve, an upper gun body water inlet pipe, a lower gun body water outlet pipe, an upper gun body water outlet pipe, a lower gun body cooling water inlet pipe, a powder feeding pipe, a powder feeding pipe, a lower gun body sleeve cooling water inlet and outlet pipe, an insulating rubber sleeve, a plasma gas inlet pipe, and a shielding gas inlet pipe; it adopts a structure of two-way powder, two-way gas, and two-way circulating water, but the gun body is divided into upper and lower parts and is cooled by two-way circulating water respectively, with a relatively complex structure, numerous and miscellaneous pipelines, and occupying space.

[0004] Therefore, it is necessary to improve the deficiencies of the above prior art. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a plasma surfacing torch in view of the deficiencies of the above prior art, and solve the problems that the gun body is divided into upper and lower parts and is cooled by two-way circulating water respectively in the prior art, with a relatively complex structure, numerous and miscellaneous pipelines, and occupying space.

[0006] To achieve the above object, the present utility model provides the following technical solution: a plasma surfacing torch, comprising a gun body, a tungsten electrode end cap is hermetically installed at one end of the gun body, and a cover body is installed at the other end. An insulating protective shell is sleeved outside the gun body and the cover body. A nozzle hole is provided at the center of the cover body. A tungsten electrode chuck is installed on the tungsten electrode end cap. A tungsten needle penetrates through the center of the tungsten electrode chuck. One end of the tungsten needle is in transitional fit with the tungsten electrode end cap, and the tip of the other end extends to the nozzle hole. A water inlet pipe, a water outlet pipe, a first powder inlet pipe, a second powder inlet pipe, a plasma gas inlet pipe, and a shielding gas inlet pipe are connected to one side of the gun body. A first water channel communicating with the water inlet pipe at one end is provided inside the gun body. A second water channel communicating with the other end of the first water channel at one end is provided inside the cover body. A third water channel communicating with the water outlet pipe at one end and the second water channel at the other end is also provided inside the gun body.

[0007] With the above technical solution, the cooling water flows into the first water channel inside the gun body from the water inlet pipe, then flows into the cover body through the second water channel, then flows through the third water channel, and finally flows out through the water outlet pipe to complete the cooling water circulation loop, which can cool the inside of the gun body and the cover body at the same time; since only one water inlet pipe and one water outlet pipe need to be set to form a cooling water circulation loop inside the gun body and the cover body, the structure is relatively simple and the external space occupation is small.

[0008] The further setting of the above technical solution is: the gun body is composed of an upper gun body, an insulating ring, and a lower gun body, and the whole gun body is tightly connected by screwing through the upper gun body and the insulating ring from the top of the upper gun body to the lower gun body. The first water channel is connected through the arc pipeline inside the upper gun body and then penetrates through the insulating ring and the pipeline inside the lower gun body. First sinking holes are provided at the joints of the inner pipelines of the upper gun body and the lower gun body with the insulating ring, and sealing rings are arranged in the first sinking holes to seal the joints between the inner pipelines of the first water channel.

[0009] With the above technical solution, after the water inlet pipe is electrified, it is conducted with the tungsten needle through the upper gun body. The gun body insulates and isolates the lower gun body from the upper gun body through the insulating ring to avoid current leakage; the cooling water flows through the upper gun body, the insulating ring, and the lower gun body respectively in sequence through the first water channel, and the joints are hermetically connected by installing sealing rings.

[0010] The further setting of the above technical solution is: second sinking holes are provided at the joints of the first water channel and the third water channel at the lower gun body and the second water channel of the cover body, and sealing rings are arranged between the two opposite second sinking holes.

[0011] With the above technical solution, the sealing performance of the joint of the cooling water channel between the gun body and the cover body is ensured by setting the sealing ring.

[0012] A further setting of the above technical solution is that one end of the insulating protective shell gathers the water inlet pipe, the water outlet pipe, the first powder inlet pipe, the second powder inlet pipe, the plasma gas inlet pipe, and the protective gas inlet pipe on one side of the gun body.

[0013] Adopting the above technical solution, through the insulating protective shell, electric leakage is avoided and safety is guaranteed. At the same time, the insulating protective shell gathers the water inlet pipe, the water outlet pipe, the first powder inlet pipe, the second powder inlet pipe, the plasma gas inlet pipe, and the protective gas inlet pipe on one side of the gun body, which can avoid messy pipelines and save space.

[0014] A further setting of the above technical solution is that the lower gun body is also provided with a first powder inlet channel communicated with the first powder inlet pipe and a second powder inlet channel communicated with the second powder inlet pipe. The cover body is provided with a first powder outlet channel and a second powder outlet channel communicated with the first powder inlet channel and the second powder inlet channel respectively on both sides of the nozzle hole.

[0015] Adopting the above technical solution, the alloy powder enters the first powder inlet channel in the gun body through the first powder inlet pipe and is then sprayed to the lower part of the nozzle hole through the outlet hole of the first powder outlet channel of the cover body. The same applies to the second powder inlet and outlet on the other side, so as to realize the simultaneous spraying of two paths of powder and improve the cladding speed.

[0016] A further setting of the above technical solution is that third counterbores are provided at the joints of the first powder inlet channel and the first powder outlet channel, and the second powder inlet channel and the second powder outlet channel. A sealing ring is arranged between the two opposite third counterbores.

[0017] Adopting the above technical solution, the sealing performance of the connection between the alloy powder inlet and outlet of the gun body and the cover body is ensured by setting the sealing ring.

[0018] A further setting of the above technical solution is that an installation channel corresponding to the position of the nozzle hole at one end is provided in the center of the lower gun body. A limiting sleeve sleeved around the tungsten needle is installed in the installation channel. A plasma gas channel communicated with the plasma gas inlet pipe is provided between the limiting sleeve and the installation channel, and the plasma gas channel is communicated with the nozzle hole.

[0019] Adopting the above technical solution, the plasma gas flows into the plasma gas channel through the plasma gas inlet pipe and then into the nozzle hole, and finally sprays out from the nozzle hole onto the welded part.

[0020] A further setting of the above technical solution is that a locking sleeve is sleeved outside the lower gun body and the cover body. One end of the locking sleeve is threadedly connected to the lower gun body and the other end is clamped to the cover body. A sealing ring is arranged between the locking sleeve and the cover body. The lower gun body is threadedly connected with a protective gas housing. A first protective gas channel communicated with the protective gas inlet pipe is provided in the lower gun body. A second protective gas channel is formed by the gap between the protective gas housing and the lower gun body, the locking sleeve and the cover body. One end of the second protective gas channel is communicated with the first protective gas channel and the other end is communicated with the outside.

[0021] With the above technical solution, the shielding gas enters the first shielding gas passage in the lower gun body through the shielding gas inlet pipe, then flows into the second shielding gas passage, and then is ejected from below the welding torch onto the welded part through the second shielding gas passage to protect the welded part.

[0022] The beneficial effects achieved by the present utility model are as follows: Since only one water inlet pipe and one water outlet pipe need to be provided to form a cooling water circulation circuit inside the gun body and the cover body, the structure is relatively simple and the occupied external space is small. Description of the Drawings

[0023] Figure 1 is the structural schematic diagram of an embodiment of the present utility model Figure 1 ;

[0024] Figure 2 is the structural schematic diagram of an embodiment of the present utility model Figure 2 ;

[0025] Figure 3 is the sectional view of an embodiment of the present utility model;

[0026] Figure 4 is the sectional view of the inside of the gun body of an embodiment of the present utility model;

[0027] Figure 5 is the structural schematic diagram of the gun body in an embodiment of the present utility model;

[0028] Figure 6 is the sectional view of the gun body in an embodiment of the present utility model Figure 1 ;

[0029] Figure 7 is the sectional view of the gun body in an embodiment of the present utility model Figure 2 ;

[0030] Figure 8 is the structural schematic diagram of the cover body in an embodiment of the present utility model;

[0031] Figure 9 is the sectional view of the cover body in an embodiment of the present utility model Figure 1 ;

[0032] Figure 10 is the sectional view of the cover body in an embodiment of the present utility model Figure 2 。 Detailed Implementation Modes

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] As Figures 1-10 shown, a plasma surfacing torch includes a gun body 1. One end of the gun body 1 is hermetically installed with a tungsten electrode tail cap 2, and the other end is installed with a cover body 3. An insulating protective shell 10 is sleeved outside the gun body 1 and the cover body 3. A nozzle hole 30 is provided at the center of the cover body 3. A tungsten electrode chuck 21 is installed on the tungsten electrode tail cap 2. A tungsten needle 22 penetrates through the center of the tungsten electrode chuck 21. One end of the tungsten needle 22 is in transitional fit with the tungsten electrode tail cap 2, and the tip of the other end extends to the nozzle hole 30. One side of the gun body 1 is connected with a water inlet pipe 4, a water outlet pipe 5, a first powder inlet pipe 6, a second powder inlet pipe 7, a plasma gas inlet pipe 8, and a protective gas inlet pipe 9. A first water channel 11 with one end communicating with the water inlet pipe 4 is provided in the gun body 1. A second water channel 31 with one end communicating with the other end of the first water channel 11 is provided in the cover body 3. A third water channel 12 with one end communicating with the water outlet pipe 5 and the other end communicating with the second water channel 31 is also provided in the gun body 1. The gun body 1 is composed of an upper gun body 13, an insulating ring 14, and a lower gun body 15, and the overall fastening connection of the gun body 1 is realized by screwing through the upper gun body 13 and the insulating ring 14 from the top of the upper gun body 13 to the lower gun body 15. The first water channel 11 is connected through an arc pipeline in the upper gun body 13 and then penetrates through the insulating ring 14 and the pipeline in the lower gun body 15. First sink holes 16 are provided at the joints of the inner pipelines of the upper gun body 13 and the lower gun body 15 with the insulating ring 14. Sealing rings are arranged in the first sink holes 16 to seal the joints between the inner pipelines of the first water channel 11. Second sink holes 17 are provided at the joints of the first water channel 11, the third water channel 12 at the lower gun body 15, and the second water channel 31 of the cover body 3. Sealing rings are arranged between the two opposite second sink holes 17. The second water channel 31 adopts an arc pipeline to avoid the nozzle hole 30.

[0035] As Figures 1-3 shown, one end of the insulating protective shell 10 gathers the water inlet pipe 4, the water outlet pipe 5, the first powder inlet pipe 6, the second powder inlet pipe 7, the plasma gas inlet pipe 8, and the protective gas inlet pipe 9 on one side of the gun body 1.

[0036] As Figure 4 、 7As shown in , , in the lower gun body 15, there are also a first powder inlet passage 151 communicating with the first powder inlet pipe 6 and a second powder inlet passage 152 communicating with the second powder inlet pipe 7. On both sides of the nozzle hole 30 in the cover body 3, there are a first powder outlet passage 32 and a second powder outlet passage 33 respectively communicating with the first powder inlet passage 151 and the second powder inlet passage 152. At the connection of the first powder inlet passage 151 and the first powder outlet passage 32, and the second powder inlet passage 152 and the second powder outlet passage 33, there are third counterbores 18, and a sealing ring is arranged between the two opposite third counterbores 18.

[0037] As Figure 3 , 4 shown in , , in the gun body 1, there is an installation passage 19 with one end corresponding to the position of the nozzle hole 30. In the installation passage 19, a limiting sleeve 23 sleeved around the tungsten needle 22 is installed. Between the limiting sleeve 23 and the installation passage 19, there is a plasma gas passage 80 communicating with the plasma gas inlet pipe 8, and the plasma gas passage 80 communicates with the nozzle hole 30.

[0038] As Figure 4 shown in , , a locking sleeve 34 is sleeved outside the lower gun body 15 and the cover body 3. One end of the locking sleeve 34 is threadedly connected to the lower gun body 15, and the other end is snap-connected to the cover body 3. A sealing ring is arranged between the locking sleeve 34 and the cover body 3. The lower gun body 15 is threadedly connected with a protective gas housing 91. In the lower gun body 15, there is a first protective gas passage 92 communicating with the protective gas inlet pipe 9. The gap between the protective gas housing 91 and the lower gun body 15, the locking sleeve 34, and the cover body 3 forms a second protective gas passage 93. One end of the second protective gas passage 93 communicates with the first protective gas passage 92, and the other end communicates with the outside.

[0039] In the above embodiment, the cooling water flows into the first water channel 11 in the gun body 1 from the water inlet pipe 4, then flows into the cover body 3 through the second water channel 31, then flows through the third water channel 12, and finally flows out through the water outlet pipe 5 to complete the cooling water circulation loop, which can cool the inside of both the gun body 1 and the cover body 3 at the same time; since only one water inlet pipe 4 and one water outlet pipe 5 need to be set to form a cooling water circulation loop inside the gun body 1 and the cover body 3, the structure is relatively simple and the external space occupied is small.

Claims

1. A plasma surfacing torch, comprising a torch body, a tungsten electrode end cap is hermetically installed at one end of the torch body, and a cover body is installed at the other end. An insulating protective shell is sleeved outside the torch body and the cover body. A nozzle hole is provided at the center of the cover body. A tungsten electrode chuck is installed on the tungsten electrode end cap. A tungsten needle penetrates through the center of the tungsten electrode chuck. One end of the tungsten needle is in transitional fit with the tungsten electrode end cap, and the tip of the other end extends to the nozzle hole. It is characterized in that: One side of the gun body is connected with a water inlet pipe, a water outlet pipe, a first powder inlet pipe, a second powder inlet pipe, a plasma gas inlet pipe and a protective gas inlet pipe. A first water channel with one end communicating with the water inlet pipe is arranged in the gun body. A second water channel with one end communicating with the other end of the first water channel is arranged in the cover body. A third water channel with one end communicating with the water outlet pipe and the other end communicating with the second water channel is also arranged in the gun body.

2. The plasma surfacing torch according to claim 1, characterized in that: The gun body is composed of an upper gun body, an insulating ring and a lower gun body, and the whole gun body is tightly connected by screwing a screw through the upper gun body and the insulating ring from the top of the upper gun body to be threadedly connected with the lower gun body. The first water channel is connected through an arc-shaped pipeline in the upper gun body and then penetrates through the insulating ring and the pipeline in the lower gun body. First sinking holes are arranged at the joints of the inner pipelines of the upper gun body and the lower gun body with the insulating ring, and sealing rings are arranged in the first sinking holes to seal the joints between the inner pipelines of the first water channel.

3. The plasma surfacing torch according to claim 2, characterized in that: Second sinking holes are arranged at the joints of the first water channel, the third water channel at the lower gun body and the second water channel of the cover body, and sealing rings are arranged between the two opposite second sinking holes.

4. The plasma surfacing torch according to claim 3, wherein: One end of the insulating protection shell gathers the water inlet pipe, the water outlet pipe, the first powder inlet pipe, the second powder inlet pipe, the plasma gas inlet pipe and the protective gas inlet pipe on one side of the gun body.

5. The plasma surfacing torch according to claim 4, characterized in that: A first powder inlet channel communicating with the first powder inlet pipe and a second powder inlet channel communicating with the second powder inlet pipe are also arranged in the lower gun body. First powder outlet channels and second powder outlet channels communicating with the first powder inlet channel and the second powder inlet channel respectively are arranged on both sides of the nozzle hole in the cover body.

6. The plasma surfacing torch according to claim 5, characterized in that: Third sinking holes are arranged at the joints of the first powder inlet channel and the first powder outlet channel, and the second powder inlet channel and the second powder outlet channel, and sealing rings are arranged between the two opposite third sinking holes.

7. The plasma surfacing torch according to claim 6, characterized in that: An installation channel corresponding to the position of the nozzle hole at one end is arranged in the center of the lower gun body. A limiting sleeve sleeved around the tungsten needle is installed in the installation channel. A plasma gas channel communicating with the plasma gas inlet pipe is arranged between the limiting sleeve and the installation channel, and the plasma gas channel communicates with the nozzle hole.

8. A plasma surfacing torch according to any one of claims 2-7, characterized in that: A locking sleeve is sleeved outside the lower gun body and the cover body. One end of the locking sleeve is threadedly connected with the lower gun body, and the other end is clamped with the cover body. A sealing ring is arranged between the locking sleeve and the cover body. The lower gun body is threadedly connected with a protective gas outer shell. A first protective gas channel communicating with the protective gas inlet pipe is arranged in the lower gun body. A second protective gas channel is formed by the gaps between the protective gas outer shell and the lower gun body, the locking sleeve and the cover body. One end of the second protective gas channel communicates with the first protective gas channel, and the other end communicates with the outside.

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