CN115815764A - Welding contact nozzle with gas distribution structure, gas distribution method of contact nozzle and welding gun - Google Patents
Welding contact nozzle with gas distribution structure, gas distribution method of contact nozzle and welding gun Download PDFInfo
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- CN115815764A CN115815764A CN202310017204.5A CN202310017204A CN115815764A CN 115815764 A CN115815764 A CN 115815764A CN 202310017204 A CN202310017204 A CN 202310017204A CN 115815764 A CN115815764 A CN 115815764A
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- 238000003466 welding Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims abstract description 91
- 239000000919 ceramic Substances 0.000 claims description 22
- 239000012528 membrane Substances 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 238000010891 electric arc Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 120
- 239000000463 material Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 235000015111 chews Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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Abstract
The invention discloses a welding contact tube with a gas distribution structure, a gas distribution method of the contact tube and a welding gun, and relates to the technical field of gas welding. Through setting up the gas distribution ring on the reposition of redundant personnel right side, make protective gas can not take place perpendicular striking when the gas distribution ring, can also shunt from air feed pipe spun protective gas through the guiding gutter on the gas distribution ring, make protective gas enter into the gas pocket of gas distribution ring fast, after protective gas passes through the gas distribution ring, protective gas can follow the cavity that the straight line got into the sheath, evenly distributed is to the cavity of sheath, then spout from the left opening of sheath fast, form the protection atmosphere around the welding point of work piece. The protective gas in the sheath is pushed to quickly form a protective atmosphere around the weld without providing additional pressure and additional protective gas.
Description
Technical Field
The invention relates to the technical field of gas welding, in particular to a welding contact tube with a gas distribution structure.
Background
The welding contact tip structure used in MIG welding is shown in fig. 1, and comprises a neck 1, a shunt 2, a contact tip 3 and a sleeve 4, wherein the sleeve 4 surrounds the shunt 2 and the contact tip 3, a welding wire 100 passes through a wire feeding hole 5 of the neck 1 and the shunt 2 and then passes through the contact tip 3, and the shunt 2 adopts a radial hole 6 as an output hole of a protective gas (inert gas).
When the existing welding contact nozzle carries out MIG welding, protective gas flows out from a gas supply pipeline of a pipe neck 1, is sprayed out from a radial hole 6 after passing through a wire feeding hole 5, and then is pushed to the periphery of a welding point to form a protective atmosphere, so that the welding point is protected from oxidation interference of the atmosphere. Then the current for welding flows to the conductive nozzle 3, the current is sent to the welding wire 100 continuously extending out of the conductive nozzle 3 through the conductive nozzle 3, the electrified welding wire 100 is contacted with the electrified workpiece to be welded, electric arc and high heat are generated to melt the welding point of the welding wire 100 and the workpiece, and the purpose of metal connection is achieved.
In the existing MIG welding solutions the shielding gas ejected from the radial holes 6 will hit the inner wall of the sleeve 4 vertically and be refracted several times, and the partially refracted shielding gas will also hit the shielding gas ejected from the radial holes 6, thus forming irregular and mutually resistant vortices, which is detrimental to the flow rate of the shielding gas, and therefore the prior art will often provide additional pressure to eliminate this detrimental effect, but this means that more shielding gas is consumed.
Disclosure of Invention
One of the purposes of the invention is to solve the problems that in the prior art, when the radial holes are adopted to spray the protective gas, vortex flow is generated to influence the flow rate of the protective gas, additional pressure needs to be provided to eliminate the influence of the flow rate of the protective gas, and further more protective gas is consumed.
The second purpose of the invention is to provide a gas distribution method for the contact tube.
The invention also aims to provide a welding gun.
In order to achieve one of the purposes, the invention adopts the following technical scheme: the utility model provides a welding contact tube with gas distribution structure, includes body, reposition of redundant personnel, leads and chews and the sheath, the body links to each other with the sheath, the reposition of redundant personnel with it links to each other to lead, the reposition of redundant personnel with it all is located to lead the mouth the cavity of sheath, the reposition of redundant personnel passes through the gas distribution circle and connects the body.
The welding wire guiding device is characterized in that a wire inlet cavity is formed in the pipe body, an air feeding pipe is connected to the wire inlet cavity, a boring hole communicated with the wire inlet cavity is formed in the shunting body, a wire feeding hole communicated with the boring hole is formed in the guide nozzle, the wire inlet cavity, the boring hole and the wire feeding hole are coaxial, and the wire inlet cavity, the boring hole and the wire feeding hole are all used for guiding out a welding wire.
The air distribution ring is sleeved on the outer wall of the flow divider, the outer wall of the air distribution ring is tightly attached to the inner wall of the cavity of the sheath, a diversion trench is arranged on the air distribution ring, the diversion trench is distributed along the shape of a ring, the heights of the two ends of the diversion trench are different, the diversion trench of an inclined structure is formed, a plurality of air holes are formed in the diversion trench, and the wire inlet cavity is communicated with the air holes through the diversion trench.
In the technical scheme, when welding is needed, the protective gas is sent out through the gas sending pipe in the pipe body, and the protective gas moves along the left side of the wire feeding cavity and is in contact with the gas distribution ring.
The protective gas is guided by the inclined guide groove in the gas distribution ring, the end with low depth of the guide groove receives the impact from the protective gas, because the depth of the guide groove is low, the protective gas is easy to diffuse into the end with the high depth of the diversion trench along the end with the low depth of the diversion trench, so that the protective gas is quickly distributed into the air holes in the diversion trench.
And then the protective gas is diffused to the cavity of the sheath along a straight line after passing through the air hole, and is sprayed out from the opening on the left side of the sheath, so that a protective atmosphere is formed around the welding point of the workpiece.
Further, in the embodiment of the invention, the flow dividing body is provided with an internal thread, the guide nozzle is provided with an external thread, and the internal thread of the flow dividing body is connected with the external thread of the guide nozzle to form a threaded connection. Through the threaded connection, the damaged guide nozzle can be conveniently replaced.
Further, in the embodiment of the present invention, the air distribution ring and the flow dividing body are of an integrated structure, or the air distribution ring and the flow dividing body are detachably connected in a separated manner.
Further, in the embodiment of the present invention, the sheath includes a first cylindrical section and a second cylindrical section, a diversion cavity is formed between the first cylindrical section and the flow splitting body, and the air distribution ring is located in the diversion cavity.
An overflowing gap is formed between the second cylindrical section and the flow splitting body, and the radial length of the overflowing gap is smaller than that of the flow guide cavity.
When the protective gas enters the overflowing gap from the flow guide cavity, the radial length of the overflowing gap is smaller than that of the flow guide cavity, so that the flow speed of the protective gas passing through the overflowing gap is increased, and the protective atmosphere can be quickly formed at the welding point of the workpiece.
Further, in an embodiment of the present invention, the sheath further comprises a tapered section surrounding the left end portion of the guide. The tapered section sheath can focus the shielding gas beam around the weld of the workpiece, which can reduce the shielding gas output.
Further, in the embodiment of the invention, a ceramic sleeve is installed in the boring hole, and the ceramic sleeve is provided with a shaft hole for the welding wire to pass through. The ceramic sleeve is made of high-heat-conducting materials, such as polycrystalline diamond (PCD), silicon carbide (SiC) and the like. The heat of the guide nozzle can be effectively absorbed through the heat conduction material, and the guide nozzle is cooled. The ceramic sheath also serves to guide and fix the welding wire, which is a common solution in the prior art and will not be described in detail here.
Furthermore, in the embodiment of the present invention, the bore hole is provided with a cooling hole communicated with the overcurrent gap or the diversion cavity, a permanent magnet and a fixed frame are installed in the bore hole, the permanent magnet is annular, a ring-shaped framework is slidably connected to the fixed frame, the ring-shaped framework is located in a cavity of the permanent magnet, a winding coil is wound on the framework, and an elastic membrane is installed on the left side of the ring-shaped framework.
Because the guide nozzle needs to have good electrical conductivity, the existing guide nozzle is mostly made of copper or copper alloy. When the guide nozzle is used for welding, the guide nozzle is easy to expand due to heating, so that the guide nozzle becomes soft, the welding wire is not easy to be led out, the gap between the welding wire and the guide nozzle is about 0.3mm, friction is easy to occur (material blockage often occurs), and the guide nozzle is abraded. Therefore, in order to ensure that the guide nozzle is used for a long time and ensure the efficiency, the heat dissipation of the guide nozzle cannot be abandoned, the following scheme is adopted:
the coil in the current-conducting body is electrified while the conducting nozzle is electrified, so that the coil generates a magnetic field, the magnetic field interacts with a magnetic field of a permanent magnet surrounding the coil, the coil and the elastic membrane are driven by the ring-shaped framework to move left and right along the axial direction, the elastic membrane further drives the air in the boring hole in the current-conducting body, finally the air in the boring hole is subjected to heat exchange with the protective gas in the overcurrent gap or the current-conducting cavity through the cooling hole under the driving of the elastic membrane, and the ceramic sleeve and the conducting nozzle are cooled (the ceramic sleeve absorbs heat to the conducting nozzle, and the cooled ceramic can indirectly cool the conducting nozzle).
The beneficial effects of the invention are:
according to the invention, the gas distribution ring is arranged on the right side of the flow distribution body, so that the protective gas cannot vertically impact when passing through the gas distribution ring, the protective gas sprayed from the gas supply pipe can be distributed through the flow guide grooves on the gas distribution ring, the protective gas can rapidly enter the gas holes of the gas distribution ring, and after the protective gas passes through the gas distribution ring, the protective gas can linearly enter the cavity of the sheath and is uniformly distributed in the cavity of the sheath (the protective gas is sprayed out of the gas holes to form a cone shape), and then the protective gas is rapidly sprayed out of the opening on the left side of the sheath, so that the protective atmosphere is formed around the welding point of the workpiece. The protective gas in the sheath is pushed to quickly form a protective atmosphere around the weld without providing additional pressure and additional protective gas.
In addition, when the protective gas enters the overflowing gap from the flow guide cavity, the radial length of the overflowing gap is smaller than that of the flow guide cavity, so that the flow speed of the protective gas passing through the overflowing gap is increased, and the protective atmosphere can be formed at the welding point of the workpiece quickly.
In order to achieve the second purpose, the invention adopts the following technical scheme: a welding gun having a welding contact tip with a gas distribution structure as set forth in one of the above objects.
In order to achieve the third purpose, the invention adopts the following technical scheme: the gas distribution method of the contact tube is applied to the welding contact tube with the gas distribution structure in one of the above objects, and comprises the following steps:
when welding is needed, protective gas is sent out through the gas sending pipe in the pipe body, moves along the left side of the wire feeding cavity and is in contact with the gas distribution ring.
The protective gas is guided by the inclined guide groove in the gas distribution ring, the end with low depth of the guide groove receives the impact from the protective gas, because the depth of the guide groove is low, the protective gas is easy to diffuse into the end with the high depth of the diversion trench along the end with the low depth of the diversion trench, so that the protective gas is quickly distributed into the air holes in the diversion trench.
And then the protective gas is diffused to the cavity of the sheath along a straight line after passing through the air hole, and is sprayed out from the opening on the left side of the sheath, so that a protective atmosphere is formed around the welding point of the workpiece.
Further, in the embodiment of the invention, after a protective atmosphere is formed around the welding point of the workpiece, the guide nozzle is electrified, so that the electrified welding wire is contacted with the electrified workpiece to be welded, an electric arc and high heat are generated to melt the welding point of the welding wire and the workpiece, and the aim of metal connection is fulfilled.
The coil and the elastic membrane are driven by the ring-shaped framework to move left and right along the axial direction, so that the elastic membrane drives the air in the boring hole in the flow guide body, and finally the air in the boring hole is subjected to heat exchange with the protective gas in the overflowing gap or the flow guide cavity through the cooling hole under the driving of the elastic membrane, and the ceramic sleeve and the flow guide nozzle are cooled.
Drawings
Fig. 1 is a schematic structural diagram of a welding contact tip in the prior art.
FIG. 2 is a schematic diagram of a welding contact tip according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of an air distribution ring according to an embodiment of the present invention.
FIG. 4 is another schematic diagram of a welding contact tip according to an embodiment of the present invention
In the attached drawings
1. The tube neck, 2, the shunt, 3, the conductive nozzle, 4, the tube sleeve, 5, the wire feeding hole, 6 and the radial hole;
10. a pipe body 11, a wire inlet cavity 12 and an air supply pipe;
20. the device comprises a shunt body 21, a boring hole 22, a ceramic sleeve 23, a cooling hole 24, a permanent magnet 25, a fixing frame 26, a ring-shaped framework 27, a winding coil 28 and an elastic membrane;
30. a guide nozzle;
40. the device comprises a sheath 41, a first cylindrical section 42, a second cylindrical section 43, a flow guide cavity 44, an overflow gap 45 and a conical section;
50. an air distribution ring 51, a diversion trench 52 and air holes;
100. and (4) welding wires.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are illustrative of some, but not all, embodiments of the invention and are not to be construed as limiting the scope of the invention, as those skilled in the art will recognize and appreciate that many other embodiments can be made without inventive faculty.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. But it is obvious. To one of ordinary skill in the art, the embodiments may be practiced without limitation to these specific details. In some instances, well-known contact tip gassing methods and structures have not been described in detail to avoid unnecessarily obscuring the embodiments. In addition, all embodiments may be used in combination with each other.
The first embodiment is as follows:
it should be noted that the drawings in the specification are for the content of the specification, and the structural shapes, connection relationships, fitting relationships, and positional relationships that can be obtained without any doubt in the drawings in the specification should be understood as the content of the specification.
A welding contact tube with a gas distribution structure is shown in figure 2 and comprises a tube body 10, a flow distribution body 20, a guide nozzle 30 and a sheath 40, wherein the tube body 10 is connected with the sheath 40, the flow distribution body 20 is connected with the guide nozzle 30, the flow distribution body 20 and the guide nozzle 30 are both positioned in a cavity of the sheath 40, and the flow distribution body 20 is connected with the tube body 10 through a gas distribution ring 50.
The pipe body 10 is provided with a wire inlet cavity 11, the wire inlet cavity 11 is connected with an air feed pipe 12, the shunt body 20 is provided with a boring hole 21 communicated with the wire inlet cavity 11, the guide nozzle 30 is provided with a wire feed hole communicated with the boring hole 21, the wire inlet cavity 11, the boring hole 21 and the wire feed hole are coaxial, and the wire inlet cavity 11, the boring hole 21 and the wire feed hole are all used for guiding out a welding wire 100.
As shown in fig. 2 and 3, the air distribution ring 50 is sleeved on the outer wall of the flow splitting body 20, the outer wall of the air distribution ring 50 is tightly attached to the inner wall of the cavity of the sheath 40, the air distribution ring 50 is provided with a flow guide groove 51, the flow guide groove 51 is arranged along a ring shape, the two ends of the flow guide groove 51 are different in height to form the flow guide groove 51 with an inclined structure, the flow guide groove 51 is provided with a plurality of air holes 52, and the filament inlet cavity 11 is communicated with the air holes 52 through the flow guide groove 51.
The implementation steps are as follows: when welding is required, shielding gas is fed through the gas feed pipe 12 in the pipe body 10, and the shielding gas moves along the left side of the wire feed chamber 11 and comes into contact with the gas distribution ring 50.
The protection gas is guided by the inclined guide groove 51 in the gas distribution ring 50, the impact from the protection gas is received by the end with low depth of the guide groove 51, and the protection gas is easily diffused to the end with high depth of the guide groove 51 along the end with low depth of the guide groove 51 because of the low depth of the guide groove 51, so that the protection gas is quickly distributed to the gas holes 52 in the guide groove 51.
Then, the protective gas passes through the gas hole 52, and is diffused linearly into the cavity of the sheath 40, and is ejected from the opening on the left side of the sheath 40, thereby forming a protective atmosphere around the welding point of the workpiece.
According to the invention, the right side of the flow distribution body 20 is provided with the air distribution ring 50, so that protective gas cannot vertically collide when passing through the air distribution ring 50, the protective gas sprayed from the air feed pipe 12 can be distributed through the flow guide groove 51 on the air distribution ring 50, so that the protective gas can rapidly enter the air holes 52 of the air distribution ring 50, and after the protective gas passes through the air distribution ring 50, the protective gas can linearly enter the cavity of the sheath 40 and is uniformly distributed in the cavity of the sheath 40 (the protective gas is sprayed out of the air holes 52 in a conical shape), and then the protective gas is rapidly sprayed out from the opening on the left side of the sheath 40, so that a protective atmosphere is formed around the welding point of a workpiece. The protective gas in the jacket 40 is pushed to quickly create a protective atmosphere around the weld without the need to provide additional pressure and additional protective gas.
As shown in fig. 2, the flow distribution body 20 is provided with an internal thread, the guide nozzle 30 is provided with an external thread, and the internal thread of the flow distribution body 20 is connected with the external thread of the guide nozzle 30 to form a threaded connection. By means of this screw connection, it is possible to facilitate the replacement of the worn guide nozzle 30.
The air distribution ring 50 and the flow distribution body 20 are of an integrated structure, or the air distribution ring 50 and the flow distribution body 20 are detachably connected in a separated mode.
The sheath 40 includes a first cylindrical section 41 and a second cylindrical section 42, a diversion cavity 43 is formed between the first cylindrical section 41 and the flow dividing body 20, and the air distribution ring 50 is located in the diversion cavity 43.
As shown in fig. 2, a flow gap 44 is formed between the second cylindrical section 42 and the flow splitting body 20, and a radial length of the flow gap 44 is smaller than a radial length of the diversion cavity 43.
When the protective gas enters the flow guide cavity 43 into the flow guide gap 44, the radial length of the flow guide cavity 43 is smaller than that of the flow guide cavity 44, so that the flow speed of the protective gas passing through the flow guide gap 44 is increased, and the protective atmosphere can be formed at the welding point of the workpiece quickly.
The sheath 40 further comprises a tapered section 45, the tapered section 45 surrounding the left end portion of the nozzle 30. The sheath 40 of the tapered section 45 can focus the beam of shielding gas around the weld of the workpiece, which can reduce the amount of shielding gas output.
A ceramic sleeve 22 is installed in the boring hole 21, and the ceramic sleeve 22 is provided with a shaft hole for the welding wire 100 to pass through. The ceramic sheath 22 is made of a highly heat conductive material, such as polycrystalline diamond (PCD), silicon carbide (SiC), or the like. The heat of the guide nozzle 30 can be effectively absorbed through the heat conduction material, so that the guide nozzle 30 is cooled. The ceramic sheath 22 also serves to guide and secure the welding wire 100, which is a conventional solution in the art and will not be described in detail.
As shown in fig. 4, the bore 21 is provided with a cooling hole 23 communicated with the flow passage gap 44 or the flow guide cavity 43, a permanent magnet 24 and a fixed frame 25 are installed in the bore 21, the permanent magnet 24 is annular, the fixed frame 25 is connected with an annular framework 26 in a sliding manner, the annular framework is located in a cavity of the permanent magnet 24, a winding coil 27 is wound on the framework, and an elastic membrane 28 is installed on the left side of the annular framework.
Because the nozzle 30 needs to have good electrical conductivity, the existing nozzle 30 is mostly made of copper or copper alloy. When the guide nozzle 30 is welded, the guide nozzle 30 is easily heated to expand, so that the guide nozzle 30 becomes soft, which is not beneficial to leading out the welding wire 100, and the gap between the welding wire 100 and the guide nozzle 30 is about 0.3mm, so that friction (so that material blockage often occurs) is very easy to occur, and the guide nozzle 30 is abraded. Therefore, in order to ensure the long service life of the guide nozzle 30 and the efficiency and not abandon the heat dissipation of the guide nozzle 30, the following scheme is adopted:
the coil 27 in the fluid is electrified while the guide nozzle 30 is electrified, so that the coil 27 generates a magnetic field, the magnetic field interacts with the magnetic field of the permanent magnet 24 surrounding the coil, the coil and the elastic membrane 28 are driven by the ring-shaped framework 26 to move left and right along the axial direction, the elastic membrane 28 further drives the air in the boring hole 21 in the fluid, and finally the air in the boring hole 21 is subjected to heat exchange with the protective gas of the flow passage gap 44 or the flow guide cavity 43 through the cooling hole 23 under the driving of the elastic membrane 28, so that the ceramic sleeve 22 and the guide nozzle 30 are cooled (the ceramic sleeve 22 absorbs heat to the guide nozzle 30, and the cooling ceramic can indirectly cool the guide nozzle 30).
Example two:
a welding gun is provided with the welding contact tip with the gas distribution structure in the first embodiment.
Example three:
a gas distribution method for a contact tube, which is applied to the welding contact tube with the gas distribution structure in the first embodiment, the gas distribution method for the contact tube comprises the following steps:
when welding is required, shielding gas is fed through the gas feed pipe 12 in the pipe body 10, and the shielding gas moves along the left side of the wire feed chamber 11 and comes into contact with the gas distribution ring 50.
The protection gas is guided by the inclined guide groove 51 in the gas distribution ring 50, the impact from the protection gas is received by the end with low depth of the guide groove 51, and the protection gas is easily diffused to the end with high depth of the guide groove 51 along the end with low depth of the guide groove 51 because of the low depth of the guide groove 51, so that the protection gas is quickly distributed to the gas holes 52 in the guide groove 51.
The protective gas then passes through the gas holes 52, diffuses in a straight line into the cavity of the sheath 40, and is ejected from the opening on the left side of the sheath 40, forming a protective atmosphere around the welding point of the workpiece.
When the protective gas enters the flow guide cavity 43 into the flow guide gap 44, the radial length of the flow guide cavity 43 is smaller than that of the flow guide cavity 44, so that the flow speed of the protective gas passing through the flow guide gap 44 is increased, and the protective atmosphere can be formed at the welding point of the workpiece quickly.
It is to be understood that, during normal welding, the welding gun is usually turned on, and if the shielding gas cannot rapidly form a protective atmosphere around the welding point, the welding is affected.
Adopt current MIG welding technique to carry out welding test, weld the work piece that the seam width is 16mm, and the seam length is 173 mm: the welding wire 100 is made of HS301, the diameter of the welding wire 100 is 1.6mm, the welding current is 280-300A, the arc voltage is 25-27V, the length of the extension of the welding wire 100 is 16-20mm, the welding speed is 201-350mm per minute, and the flow rate of the protective gas is 24-26L per minute.
Adopt the MIG welding technique of this application to carry out welding test, when adopting the parameter the same with current MIG welding technique, discover that welding point protective gas flow is the high point, and then with protective gas's flow control after about 20L per minute, discover that the protective gas flow of welding point is similar with current MIG welding technique's protective gas flow, derive from this, adopt this kind of mode reducible 12% protective gas loss per minute.
After a protective atmosphere is formed around the welding point of the workpiece, the conductive nozzle 30 is electrified, so that the charged welding wire 100 is contacted with the charged workpiece to be welded, electric arc and high heat are generated to melt the welding point of the welding wire 100 and the workpiece, and the aim of metal connection is fulfilled.
Because the nozzle 30 needs to have good electrical conductivity, the existing nozzle 30 is mostly made of copper or copper alloy. When the guide nozzle 30 is welded, the guide nozzle 30 is easily heated to expand, so that the guide nozzle 30 becomes soft, which is not beneficial to leading out the welding wire 100, and the gap between the welding wire 100 and the guide nozzle 30 is about 0.3mm, so that friction (so that material blockage often occurs) is very easy to occur, and the guide nozzle 30 is abraded. Therefore, in order to ensure the long service life of the guide nozzle 30 and the efficiency and not abandon the heat dissipation of the guide nozzle 30, the following scheme is adopted:
the coil 27 in the fluid is electrified while the guide nozzle 30 is electrified, so that the coil 27 generates a magnetic field, the magnetic field interacts with the magnetic field of the permanent magnet 24 surrounding the coil, the coil and the elastic membrane 28 are driven by the ring-shaped framework 26 to move left and right along the axial direction, the elastic membrane 28 further drives the air in the boring hole 21 in the fluid, and finally the air in the boring hole 21 is subjected to heat exchange with the protective gas of the flow passage gap 44 or the flow guide cavity 43 through the cooling hole 23 under the driving of the elastic membrane 28, so that the ceramic sleeve 22 and the guide nozzle 30 are cooled (the ceramic sleeve 22 absorbs heat to the guide nozzle 30, and the cooling ceramic can indirectly cool the guide nozzle 30).
Although the illustrative embodiments of the present invention have been described above to enable those skilled in the art to understand the present invention, the present invention is not limited to the scope of the embodiments, and it is apparent to those skilled in the art that all the inventive concepts using the present invention are protected as long as they can be changed within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (10)
1. A welding contact tube with a gas distribution structure comprises a tube body, a shunt body, a guide nozzle and a sheath, wherein the tube body is connected with the sheath;
a wire inlet cavity is arranged in the pipe body, an air feed pipe is connected in the wire inlet cavity, a boring hole communicated with the wire inlet cavity is formed in the shunting body, a wire feed hole communicated with the boring hole is formed in the guide nozzle, the wire inlet cavity, the boring hole and the wire feed hole are coaxial, and the wire inlet cavity, the boring hole and the wire feed hole are all used for leading out a welding wire;
the air distribution ring is sleeved on the outer wall of the flow divider, the outer wall of the air distribution ring is tightly attached to the inner wall of the cavity of the sheath, a diversion trench is arranged on the air distribution ring, the diversion trench is distributed along the shape of a ring, the heights of the two ends of the diversion trench are different, the diversion trench of an inclined structure is formed, a plurality of air holes are formed in the diversion trench, and the wire inlet cavity is communicated with the air holes through the diversion trench.
2. The welding contact tube with the gas distribution structure as claimed in claim 1, wherein the shunt body is provided with an internal thread, the guide nozzle is provided with an external thread, and the internal thread of the shunt body is connected with the external thread of the guide nozzle to form a threaded connection.
3. The welding contact tube with the gas distribution structure as claimed in claim 1, wherein the gas distribution ring and the shunt body are of an integral structure, or the gas distribution ring and the shunt body are detachably connected in a separated manner.
4. The welding contact tip with the gas distribution structure as recited in claim 1, wherein the sheath comprises a first cylindrical section and a second cylindrical section, a diversion cavity is formed between the first cylindrical section and the diversion fluid, and the gas distribution ring is located in the diversion cavity;
an overflowing gap is formed between the second cylindrical section and the flow splitting body, and the radial length of the overflowing gap is smaller than that of the flow guide cavity.
5. The welding contact tip with the gas distribution structure as recited in claim 4, wherein the sheath further comprises a tapered section surrounding a left end portion of the contact tip.
6. The welding contact tip with the gas distribution structure as recited in claim 1, wherein a ceramic sleeve is installed in the bore hole, and the ceramic sleeve is provided with a shaft hole for the welding wire to pass through.
7. The welding contact tube with the gas distribution structure according to claim 4, wherein the bore hole is provided with a cooling hole communicated with the flow passage gap or the flow guide cavity, a permanent magnet and a fixed frame are installed in the bore hole, the permanent magnet is annular, a ring-shaped framework is connected onto the fixed frame in a sliding manner, the ring-shaped framework is located in a cavity of the permanent magnet, a winding coil is wound on the framework, and an elastic membrane is installed on the left side of the ring-shaped framework.
8. A welding gun, characterized in that the welding gun is provided with a welding contact tip with a gas distribution structure as recited in any one of claims 1 to 7.
9. A contact tube gas distribution method, which is applied to the welding contact tube with the gas distribution structure of any one of claims 1 to 7, and comprises the following steps:
when welding is needed, protective gas is sent out through the gas sending pipe in the pipe body, and the protective gas moves along the left side of the wire feeding cavity and contacts with the gas distribution ring;
the protective gas is guided by the inclined guide groove in the gas distribution ring, the end with the low depth of the guide groove receives the impact from the protective gas, and the protective gas is easy to diffuse into the end with the high depth of the guide groove along the end with the low depth of the guide groove because of the low depth of the guide groove, so that the protective gas is quickly distributed into the gas holes in the guide groove;
and then the protective gas is diffused to the cavity of the sheath along a straight line after passing through the air hole, and is sprayed out from the opening on the left side of the sheath, so that a protective atmosphere is formed around the welding point of the workpiece.
10. The contact tip gas distribution method of claim 9, wherein after a protective atmosphere is formed around the welding point of the workpiece, the contact tip is energized to contact the charged welding wire with the charged workpiece to be welded, thereby generating an electric arc and high heat to melt the welding wire and the welding point of the workpiece for metal connection;
and meanwhile, the winding coil in the current guide body is electrified to generate a magnetic field, the magnetic field interacts with a permanent magnet magnetic field surrounding the coil, the coil and the elastic membrane are driven by the ring-shaped framework to move left and right along the axial direction, the elastic membrane drives the air bored in the current guide body, and finally the air bored is subjected to heat exchange with the protective gas in the overcurrent gap or the current guide cavity through the cooling hole under the driving of the elastic membrane to cool the ceramic sleeve and the current guide nozzle.
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| CN2670760Y (en) * | 2003-11-11 | 2005-01-12 | 济南派克焊接技术有限公司 | Self cooled and gas protecting welding gun with annular plastic coated melting electrode |
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