A welding gun capable of quickly replacing a nozzle

Abstract

The present invention proposes a welding gun with a quickly replaceable gun nozzle, comprising a gun barrel, a gun nozzle, a fixing part and a connecting part, wherein the gun nozzle is provided with a sleeve end for inserting into the gun barrel, the gun nozzle is sleeved on the end of the gun barrel through the sleeve end, the connecting part is movably sleeved on the connection between the gun nozzle and the gun barrel, and the movement of the connecting part can apply pressure to the sleeve end for compaction; the fixing part is connected to the front end of the gun barrel, the fixing part is provided with a coolant inlet and outlet, and the gun barrel and the fixing part are provided with a communicating coolant circulation pipeline; the problem that the gun head replacement process is complicated and standardized operation cannot be realized in the prior art is solved, and a water cooling system and a protective gas protection are also provided to jointly protect the welding gun head and the gun barrel.

Description

Technical Field

[0001] The invention relates to the field of welding gun heads, and in particular to a welding gun with a nozzle that can be quickly replaced. Background Art

[0002] Arc cladding is currently a major cladding method. It uses welding rods or electrodes to deposit on the surface of the substrate for cladding. It uses a large-scale and wide-ranging welding rod electric welder, which is simple, flexible, and low-cost. Almost all solid and flux-cored electrodes can be used and are widely used. The working principle of the welding gun head used in additive manufacturing and arc cladding is to apply high voltage between the welding gun head and the object to be welded to generate an arc, melt the molten weld installed between the welding heads, and weld the object to be welded or perform additive manufacturing.

[0003] The gun head mentioned above is a consumable part. Due to its close contact with the arc starting point, it will burn out or stick to the welding wire after a long period of use. The gun head needs to be cleaned regularly and replaced periodically. In the prior art, the connection between the nozzle and the gun barrel of the welding gun is generally a threaded connection. The number of rotation circles during disassembly and installation of the threaded connection is generally not fixed. Each batch of nozzles has deviations, and precise axial linkage is required during rotation. It is impossible to complete disassembly and installation quickly and accurately, and it is difficult to achieve standardized operations. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes a method to solve the problem that the threaded gun nozzle and the gun head in the prior art cannot be quickly and accurately disassembled and assembled, and it is difficult to achieve standardized operations.

[0005] The technical solution of the present invention is implemented as follows: a welding gun with a quick replaceable gun nozzle comprises a gun rod, a gun nozzle and a connecting piece;

[0006] The front end of the gun nozzle is movably connected with the rear end of the gun rod, and the connecting piece is movably sleeved at the connection between the gun nozzle and the gun rod.

[0007] Preferably, the front end of the gun nozzle is provided with a sleeve end for clamping into the rear end of the gun rod.

[0008] Preferably, the ferrule end is a strip structure arranged at intervals in a circle, a slot is provided on the inner wall at the top of the ferrule end, and an annular protrusion that is engaged with the slot is provided on the outer wall at the end of the gun barrel.

[0009] Preferably, it also includes a fixing piece, which is connected to the head end of the gun barrel.

[0010] Preferably, the fixing member is provided with a coolant inlet and outlet and an air inlet and outlet; a coolant circulation channel connected to the coolant inlet and outlet is provided inside the fixing member and the gun barrel, and a gas channel connected to the air inlet and outlet is also provided.

[0011] Preferably, a sealing ring is provided in the middle of the gun barrel, and a movable sleeve is provided on the outer side of the sealing ring to drive the connecting piece to move. The sealing ring divides the inner cavity of the movable sleeve into an upper cavity and a lower cavity. The sealing ring is provided with a first air hole in the upper cavity and a second air hole in the lower cavity; the gas channel is connected to the first air hole and the second air hole.

[0012] Preferably, a continuous groove is provided in the middle of the gun barrel, the groove is communicated with the coolant circulation pipeline, and a through pipe is sleeved on the outer side of the groove.

[0013] Preferably, the connecting piece is provided with a protective gas through hole.

[0014] Compared with the prior art, the present invention has the following advantages: first, the connection between the gun head and the gun rod adopts a snap-fit ​​connection. Compared with the threaded connection used in the prior art, the snap-fit ​​connection further adds a fixing method of the connecting piece and the movable sleeve, so that the connection of the gun head can be more firmly connected. At the same time, when replacing, the gun head can be easily removed by only moving the connecting piece upwards. The simple mechanical action can complete the task of replacing the gun head; the problem that the gun head replacement process is complicated and standardized operation cannot be achieved in the prior art is solved;

[0015] Then, the present invention is also provided with a water cooling structure, which is composed of a coolant inlet and outlet of the fixing part, a coolant circulation channel communicating between the fixing part and the inside of the gun barrel, a circle of continuous grooves in the middle of the gun barrel, and a through pipe sleeved on the outer side of the groove to form a water cooling system, which takes away the heat generated by the gun barrel during operation and prevents the overheating from affecting the service life of the components;

[0016] Finally, a protective gas inlet hole is provided on the outer wall of the connector. After the protective gas is introduced, the gas flows along the inside of the connector to the ferrule end. Since the ferrule ends are arranged at intervals and there are gaps, the gas can flow to the gun head to protect the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a structural schematic diagram of a welding gun capable of quickly replacing a gun nozzle according to the present invention;

[0019] Figure 2 An exploded view of a welding gun capable of quickly replacing a gun nozzle according to the present invention;

[0020] Figure 3 This is a schematic diagram of a gun rod structure capable of quickly replacing a welding gun nozzle according to the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of a gun head capable of quickly replacing a welding gun nozzle according to the present invention;

[0022] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0023] Figure symbols: 1 gun barrel; 11 sealing ring; 12 groove; 13 annular protrusion; 14 through pipe; 15 first air hole; 16 second air hole; 2 gun nozzle; 21 ferrule end; 211 slot; 3 connecting piece; 31 protective air hole; 4 movable sleeve; 5 fixing piece; 51 coolant inlet and outlet; 52 air inlet and outlet. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] refer to Figure 1-5 , a welding gun with a quick replaceable gun nozzle, comprising a gun rod 1, a gun nozzle 2 and a connecting piece 3;

[0026] The front end of the gun nozzle 2 is movably connected to the rear end of the gun barrel 1 , and the connecting piece 3 is movably sleeved at the connection between the gun nozzle 2 and the gun barrel 1 .

[0027] Furthermore, a sleeve end 21 for inserting into the end of the gun rod 1 is provided at the front end of the gun nozzle 2 .

[0028] Furthermore, the ferrule end 21 is a strip structure arranged at intervals in a circle, a slot 211 is provided on the inner wall at the top of the ferrule end 21, and an annular protrusion 13 that is engaged with the slot 211 is provided on the outer wall at the end of the gun barrel 1; and the two sides of the annular protrusion 13 are designed as inclined structures, which play a role in guiding and adjusting the assembly midpoint for the insertion of the slot 211, so that the ferrule end 21 is easier to insert and remove.

[0029] The ferrule end 21 is a strip structure arranged at intervals in a circle. The strip structure is easy to deform and has a gap for the protective gas to pass through. A slot 211 is provided on the inner wall at the top of the ferrule end 21, and an annular protrusion 13 engaged with the slot 211 is provided on the outer wall at the end of the gun barrel 1. After the slot 211 is engaged with the annular protrusion 13, the connector 3 moves downward to apply pressure to the ferrule end 21, making it difficult for the ferrule end 21 to be disengaged from the engaged state. When the connector 3 moves upward, the ferrule end 21 can be easily pulled out from the engaged state because it is a strip structure that is easy to deform.

[0030] Furthermore, it also includes a fixing member 5, which is connected to the front end of the gun barrel 1; the fixing member 5 is used to fix the welding gun head as a whole on other equipment for coordinated work.

[0031] Furthermore, the fixing member 5 is provided with a coolant inlet and outlet 51 and an air inlet and outlet 52 ; the fixing member 5 and the gun barrel 1 are provided with a coolant circulation channel connected to the coolant inlet and outlet 51 , and are also provided with the air inlet and outlet 52 .

[0032] Furthermore, a sealing ring 11 is provided in the middle of the gun barrel 1, and a movable sleeve 4 is provided on the outer side of the sealing ring 11 to drive the connecting member 3 to move. The sealing ring 11 divides the inner cavity of the movable sleeve 4 into an upper cavity and a lower cavity. The sealing ring 11 is provided with a first air hole 15 at the upper cavity and a second air hole 16 at the lower cavity; the gas channel is connected with the first air hole 15 and the second air hole 16.

[0033] The upper and lower ends of the movable sleeve 4 are sleeved on the gun barrel 1 and are provided with sealing materials, such as rubber rings, to ensure that the interior of the movable sleeve 4 is a sealed and independent space. Similarly, sealing materials are also provided on the sealing ring 11 to ensure that the upper cavity and the lower cavity are independent cavities.

[0034] Furthermore, the air inlet and outlet on the fixing part are respectively connected to the first air hole in the upper cavity and the second air hole in the lower cavity in the movable sleeve 4. When the external air pump is connected to the air inlet and outlet 52 on the fixing part 5, the upper and lower cavities can be independently pressurized or decompressed. By outputting gas to the second air hole 16, the air pressure in the lower cavity of the movable sleeve 4 is increased, and the movable sleeve 4 is moved downward by the air pressure, and the connecting part 3 is driven to move downward at the same time. The connecting part 3 applies pressure to the ferrule end 21, so that the ferrule end 21 is more fixed to the gun barrel 1 and cannot fall off easily; conversely, by delivering gas to the first air hole 15, the air pressure in the upper cavity of the movable sleeve 4 is increased, and the movable sleeve 4 is moved upward by the air pressure. The movable sleeve 4 drives the connecting part 3 to move upward, so that the connecting part 3 is away from the ferrule end 21, and the ferrule end 21 can be easily pulled out without external pressure.

[0035] Furthermore, a continuous groove 12 is provided in the middle of the gun barrel 1, and the groove 12 is connected to the coolant circulation pipeline, and a through pipe 14 is provided outside the groove 12 to protect the coolant in the groove 12 from flowing out; the through pipe 14 is generally made of a material with good thermal conductivity, such as copper, because the through pipe is the part with the largest area in contact with the coolant, and this is also the point where the temperature is more concentrated. The through pipe 14 has good thermal conductivity and can better cooperate with the coolant to take away the heat in the gun barrel 1.

[0036] Furthermore, the coolant flows into the coolant circulation channel through the coolant inlet and outlet 51, flows through the groove 12 of the gun barrel 1, flows into the coolant circulation channel, and then flows out from the coolant inlet and outlet 51. This process can effectively take away the heat in the gun barrel 1.

[0037] Furthermore, the connector 3 is provided with a shielding gas through hole 31. After shielding gas is introduced through the shielding gas through hole 31, the gas flows along the inside of the connector 3 to the ferrule end 21. Since the ferrule end 21 is arranged at intervals and there are gaps, the gas can pass to the gun head to protect the welding process.

[0038] Compared with the prior art, the present invention has the following advantages: first, the connection between the gun head and the gun barrel 1 adopts a snap-fit ​​connection. Compared with the threaded connection used in the prior art, a fixing method of the connecting member 3 and the movable sleeve 4 is added on the basis of the snap-fit ​​connection, so that the connection of the gun head can be more secure. At the same time, when replacing, only the connecting member 3 needs to be moved upward to easily remove the gun head. The simple mechanical action can complete the task of replacing the gun head; it solves the problem that the gun head replacement process in the prior art is complicated and standardized operation cannot be achieved.

[0039] Then, the present invention is also provided with a water cooling structure, which is composed of a coolant inlet and outlet 51 of the fixing member 5, a coolant circulation channel communicating between the fixing member 5 and the inside of the gun barrel 1, a circle of continuous grooves 12 in the middle of the gun barrel 1, and a through pipe 14 sleeved on the outside of the grooves 12 to form a water cooling system, which takes away the heat generated by the gun barrel 1 during operation and prevents overheating from affecting the service life of the components;

[0040] Finally, a protective gas inlet hole is provided on the outer wall of the connector 3. After the protective gas is introduced, the gas flows along the inside of the connector 3 to the ferrule end 21. Since the ferrule end 21 is arranged at intervals and there are gaps, the gas can pass to the gun head to protect the welding process.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding gun with a quick-change nozzle. Features: Including gun barrel, gun nozzle and connecting parts; The front end of the gun nozzle is movably connected to the rear end of the gun barrel, and the connecting piece is movably sleeved at the connection between the gun nozzle and the gun barrel; It also includes a fixing member, which is connected to the head end of the gun barrel; The fixing member is provided with a coolant inlet and outlet and an air inlet and outlet; the fixing member and the gun barrel are provided with a coolant circulation channel connected to the coolant inlet and outlet, and a gas channel connected to the air inlet and outlet; A sealing ring is provided in the middle of the gun barrel, a movable sleeve for driving the connecting piece to move is sleeved on the outer side of the sealing ring, and sealing materials are provided on the upper and lower ends of the movable sleeve sleeved on the gun barrel, the sealing ring divides the inner cavity of the movable sleeve into an upper cavity and a lower cavity, the sealing ring is provided with a first air hole in the upper cavity, and a second air hole in the lower cavity; the gas channel is connected with the first air hole and the second air hole; The front end of the gun nozzle is provided with a sleeve end for clamping into the end of the gun rod; After the ferrule end of the gun nozzle is inserted into the end of the gun rod, the connecting piece applies pressure to the ferrule end when it moves downward, making it difficult for the ferrule end to be disengaged from the engaged state. When the connecting piece moves upward, the ferrule end is easily pulled out from the engaged state.

2. A welding gun with a quick-change nozzle as claimed in claim 1, Features: The ferrule end is a strip structure arranged at intervals in a circle, a slot is arranged on the inner wall of the top of the ferrule end, and an annular protrusion that is engaged with the slot is arranged on the outer side wall of the end of the gun rod.

3. A welding gun with a quick-change nozzle as claimed in claim 1, Features: A continuous groove is arranged in the middle of the gun barrel, the groove is communicated with a coolant circulation pipeline, and a through pipe is sleeved on the outer side of the groove.

4. A welding gun with a quick-change nozzle as claimed in claim 1, Features: The connecting piece is provided with a protective gas through hole.

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