CN109623112B - Back atmosphere protection device for argon arc welding of shell - Google Patents
Back atmosphere protection device for argon arc welding of shell Download PDFInfo
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- CN109623112B CN109623112B CN201910002823.0A CN201910002823A CN109623112B CN 109623112 B CN109623112 B CN 109623112B CN 201910002823 A CN201910002823 A CN 201910002823A CN 109623112 B CN109623112 B CN 109623112B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
- B23K9/325—Devices for supplying or evacuating shielding gas
- B23K9/326—Purge gas rings, i.e. devices for supplying or evacuating shielding gas inside of hollow or tubular articles, e.g. pipes, vessels
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Abstract
本发明公开了一种壳体氩弧焊的背面气氛保护装置，属于机械加工领域，该背面气氛保护装置包括通气直管、通气弯头和保护气头；通气直管的一端用于与储气设备的出气软管相连；通气弯头的一端与通气直管的另一端相连，另一端与保护气头可拆卸连接；保护气头包括本体和多孔出气板，本体远离通气弯头的一端设置有储气槽，多孔出气板连接在储气槽的开口端；多孔出气板上均匀间隔设有多个出气孔。使用时，保护气头通过壳体的开口伸入壳体的内腔，贴紧焊缝的背面，有针对性地排除焊缝背面的空气，为壳体的焊缝提供更纯净的气氛保护。储气槽内的氩气经由多个出气孔吹出，采取多点出气的方式，气流稳定可靠，对焊缝背面成型有很好的帮促作用。
The invention discloses a back atmosphere protection device for shell argon arc welding, belonging to the field of machining. The back atmosphere protection device comprises a ventilation straight pipe, a ventilation elbow and a protective gas head; one end of the ventilation straight pipe is used for connecting with gas storage The outlet hose of the equipment is connected; one end of the ventilation elbow is connected with the other end of the ventilation straight pipe, and the other end is detachably connected with the protective gas head; the protective gas head includes a body and a porous gas outlet plate, and the end of the body away from the ventilation elbow is provided with a In the gas storage tank, the porous gas outlet plate is connected to the open end of the gas storage tank; the porous gas outlet plate is provided with a plurality of gas outlet holes evenly spaced. When in use, the shielding gas head extends into the inner cavity of the shell through the opening of the shell, sticks to the back of the welding seam, and removes the air on the back of the welding seam in a targeted manner, so as to provide a purer atmosphere protection for the welding seam of the shell. The argon gas in the gas storage tank is blown out through multiple air outlets, and the air flow is stable and reliable, which has a good effect on the formation of the back of the weld.
Description
Technical Field
The invention relates to the field of machining, in particular to a back atmosphere protection device for shell argon arc welding.
Background
The argon arc welding technology is a welding technology which utilizes argon to protect metal welding materials on the basis of common electric arc welding, melts the welding materials into liquid on a welded base material through high current to form a molten pool, and enables the welded metal and the welding materials to be metallurgically combined. Because argon is continuously fed in the high-temperature fusion welding process, the welding material cannot be contacted with oxygen in the air, and the oxidation of the welding material is prevented.
When some shell structures are welded in an argon arc welding mode, due to structural limitation of the shell, a conventional method of welding one surface and cleaning the other surface cannot be adopted, complete penetration is guaranteed, and only a welding process of single-surface welding and double-surface forming is adopted. Namely, only one side of the outer side of the shell structure is welded, the inner cavity of the shell structure is sealed and ventilated, back gas protection is carried out, and a double-side welding seam is formed.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
some shells inner structure are complicated, and the space is narrow and small, and when whole inner chamber seals to ventilate and carries out back atmosphere protection, not only gas consumption is big, causes the difficult discharge of air moreover easily, and protective gas concentration is inhomogeneous to lead to the back protection effect poor, can't guarantee welding quality.
Disclosure of Invention
In order to solve the problems that the welding quality is affected due to the fact that the inner structure of the shell is complex and the space is narrow and small, and the back atmosphere protection of argon arc welding is not in place, the embodiment of the invention provides a back atmosphere protection device for shell argon arc welding, which can economically and effectively perform back atmosphere protection of shell argon arc welding, and the technical scheme is as follows:
on one hand, the back atmosphere protection device for the shell argon arc welding is provided, and comprises a ventilation straight pipe, a ventilation elbow and a protection gas head; one end of the ventilation straight pipe is used for being connected with an air outlet hose of the air storage device; one end of the vent elbow is connected with the other end of the vent straight pipe, and the other end of the vent elbow is detachably connected with the protective gas head; the protective gas head comprises a body and a porous gas outlet plate, wherein a gas storage groove is formed in one end, away from the ventilating elbow, of the body, a connecting hole is formed in the bottom of the gas storage groove and used for being connected with the ventilating elbow, and the porous gas outlet plate is connected to the opening end of the gas storage groove; a plurality of air outlet holes are uniformly arranged on the porous air outlet plate at intervals.
Furthermore, the back atmosphere protection device also comprises a rotary joint, the ventilation elbow is detachably connected with the rotary joint, and the ventilation elbow is connected with the connecting hole through the rotary joint; the rotary joint can rotate around the axis direction of the connecting hole.
Further, the rotary joint comprises an upper sleeve and a lower sleeve, wherein the upper sleeve is sleeved in the lower sleeve and can rotate 360 degrees around the axial direction of the lower sleeve.
Furthermore, the lower sleeve of the rotary joint comprises an outer pipe, an inner pipe and a marble, the outer pipe is sleeved and fixed on the outer side of the inner pipe, a groove is formed in the inner pipe, the marble is located in the groove, and the depth of the groove is smaller than the diameter of the marble; the upper sleeve is provided with a clamping groove, and when the upper sleeve is inserted into the lower sleeve, the part of the marble outside the groove is clamped into the clamping groove.
Further, the opening width of the groove is smaller than the diameter of the marble.
Furthermore, a bulge is arranged between one end of the upper sleeve, which is far away from the protective gas head, and the clamping groove, and one side of the bulge, which is far away from the protective gas head, is in smooth transition with the outer surface of the upper sleeve.
Furthermore, the clamping groove is arranged along the circumferential direction of the upper sleeve, the clamping groove comprises a clamping groove bottom and a side wall, and the included angle between one side of the protrusion close to the protective gas head and the clamping groove bottom is larger than 150 degrees.
Furthermore, a fixing groove which is the same as the appearance size of the porous air outlet plate is formed in the body of the protective air head, at least two threaded holes are formed in the bottom edge of the fixing groove, through holes are formed in the corresponding positions of the porous air outlet plate, and the fixing groove and the porous air outlet plate penetrate through the through holes and are connected with the threaded holes through screws.
Furthermore, the depth of the air storage tank is 4-6 mm.
Further, the vent elbow is a metal corrugated pipe.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the back atmosphere protection device in the embodiment of the invention is connected with the air outlet hose of the air storage device through one end of the ventilation straight pipe, and provides argon for the back atmosphere protection device. One end of the vent elbow is connected with the other end of the vent straight pipe, and one end of the vent elbow is detachably connected with the protective gas head. When the protective gas head is used, the protective gas head extends into the inner cavity of the shell through the opening of the shell and is tightly attached to the back of the welding line, air on the back of the welding line is purposefully removed, and purer atmosphere protection is provided for the welding line of the shell. The end of the body of the protective gas head, which is far away from the ventilating elbow, is provided with a gas storage tank, and the bottom of the gas storage tank is provided with a connecting hole for connecting with the ventilating elbow. Argon enters the gas storage tank through the ventilation straight pipe and the ventilation elbow. The porous air outlet plate is connected with the opening end of the air storage tank, and a plurality of air outlet holes are uniformly formed in the porous air outlet plate. Argon in the gas storage tank is blown out through a plurality of air outlets, and a multi-point air outlet mode is adopted, so that the gas flow is stable and reliable, and a good help effect is realized on the back forming of the weld joint.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a sectional view of a sector-shaped case of an intercooler case according to an embodiment of the present invention;
FIG. 2 is a front view of a fan housing of an intercooler housing according to an embodiment of the present invention;
FIG. 3 is a front view of an installation schematic diagram of a back atmosphere protection device for argon arc welding of a housing according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a rotary joint of a back atmosphere protection device for argon arc welding of a housing according to an embodiment of the present invention;
FIG. 5 is an enlarged view of a rotary joint I of the argon arc welding back atmosphere protection device for the shell provided in FIG. 4;
FIG. 6 is a top view of a rotary joint of a back atmosphere protection device for argon arc welding of a housing according to an embodiment of the present invention;
FIG. 7 is a sectional view of a shielding gas head of an argon arc welding back atmosphere shielding device for a housing according to an embodiment of the present invention;
FIG. 8 is a top view of a shielding gas head of the back atmosphere shielding device for argon arc welding of a housing according to an embodiment of the present invention;
FIG. 9 is a schematic plan view illustrating an installation of a back atmosphere protection device for argon arc welding of a housing according to an embodiment of the present invention;
FIG. 10 is a sectional view of a shielding gas head of an argon arc welding back atmosphere shielding device for a housing according to an embodiment of the present invention.
Fig. 11 is a schematic view of a shielding gas head of a back atmosphere shielding apparatus for argon arc welding of a housing according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In order to understand the present embodiment more clearly, the present embodiment takes the intercooler casing as an example, and the back atmosphere protection during the casing welding is described. It should be noted that the back atmosphere protection device for argon arc welding of the shell can be used for back atmosphere protection of various shells, and is not limited to the back atmosphere protection during the welding of the intercooler shell.
The intercooler and the intercooler casing will be briefly described below. The intercooler is a key part which has important influence on the performance of the gas turbine, and the principle of the intercooler is that air is compressed by the low-pressure compressor (the temperature is about 180 ℃), enters the high-pressure compressor through the intercooler, and is cooled by the intercooler to reduce the temperature of the air entering the high-pressure compressor to 55-60 ℃, so that the compression power consumption of the high-pressure compressor is obviously reduced, and the power of the whole unit is obviously improved.
Fig. 1 is a sectional view of a sector-shaped case of an intercooler case according to an embodiment of the present invention. Fig. 2 is a front view of a sector-shaped case of an intercooler case according to an embodiment of the present invention. The intercooler casing is an important part of the intercooler, as shown in fig. 1 and 2, the intercooler casing is of an annular frame structure and is formed by connecting and assembling four 90-degree fan-shaped casings 1 through bolts and pins. The 90-degree fan-shaped shell 1 is formed by gradually welding 3 trapezoid frame bodies 11, an inner flow channel 12, a positioning block 13, a guide plate 14, an inlet support plate 15 and an outer flow channel 16. The outer flow channel 16 is directly contacted with the compressed air, so that the connecting welding seam needs to bear thermal fatigue load, the requirements on the internal and external quality of the welding seam are very high, and complete penetration welding needs to be ensured.
Fig. 3 is a schematic installation diagram of a back atmosphere protection device for argon arc welding of a housing according to an embodiment of the present invention, as shown in fig. 3, the back atmosphere protection device includes a straight ventilation pipe 100, a ventilation elbow 200, and a protection gas head 300; one end of the ventilation straight pipe 100 is connected with an air outlet hose of the gas storage device and used for providing argon gas; one end of the vent elbow 200 is connected with the other end of the vent straight pipe 100, and the other end of the vent elbow 200 is detachably connected with the protective gas head 300; the protection gas head 300 comprises a body 310 and a porous gas outlet plate 320, wherein a gas storage groove 311 is formed in one end, far away from the vent elbow 200, of the body 310, a connecting hole 312 is formed in the bottom of the gas storage groove 311 and used for being connected with the vent elbow 200, the porous gas outlet plate 320 is connected to the open end of the gas storage groove 311, and a plurality of gas outlet holes 321 are uniformly formed in the porous gas outlet plate 320.
The back atmosphere protection device in the embodiment of the invention is connected with the air outlet hose of the air storage device through one end of the ventilation straight pipe 100, and provides argon gas for the back atmosphere protection device. One end of the vent elbow 200 is connected with the other end of the vent straight pipe 100, and one end of the vent elbow 200 is detachably connected with the protective gas head 300. When the protective gas head 300 is used, the protective gas head extends into the inner cavity of the shell through the opening of the shell and is tightly attached to the back of a welding seam, air on the back of the welding seam is purposefully removed, and purer atmosphere protection is provided for the welding seam of the shell. An air storage slot 311 is arranged at one end of the body of the protective air cap 300, which is far away from the vent elbow 200, and a connecting hole 312 is arranged at the bottom of the air storage slot 311 and used for connecting with the vent elbow 200. The argon gas enters the gas storage tank 311 through the vent straight pipe 100 and the vent elbow 200. The porous air outlet plate 320 is connected to the open end of the air storage tank 311, and a plurality of air outlets 321 are uniformly arranged on the porous air outlet plate 320. Argon in the gas storage tank 311 is blown out through the plurality of gas outlet holes 321, a multi-point gas outlet mode is adopted, gas flow is stable and reliable, and a good promoting effect is achieved on the back forming of the welding seam.
Further, the back atmosphere protection device further comprises a rotary joint 400, one end of the rotary joint 400 is detachably connected with the vent elbow 200 and the rotary joint 400, the vent elbow 200 is connected with the connecting hole 312 through the rotary joint 400, and the rotary joint 400 can rotate around the axis direction of the connecting hole 312. In the welding process, the shielding gas head 300 can rotate 360 degrees along the axial direction of the connecting hole 312, so that the shielding gas head 300 can be attached to the inner parts of cavities with various shapes.
FIG. 4 is a cross-sectional view of a rotary joint of a back atmosphere protection device for argon arc welding of a housing according to an embodiment of the present invention. As shown in fig. 4, the rotary joint 400 includes an upper casing 410 and a lower casing 420, wherein the upper casing 410 is sleeved in the lower casing 420, and the two are hermetically connected. The upper sleeve 410 is rotatable 360 degrees about the axial direction of the lower sleeve 420.
Optionally, the lower sleeve 420 of the rotary joint 400 includes an outer tube 421, an inner tube 422, and a marble 423, the outer tube 421 is sleeved and fixed on the outer side of the inner tube 422, a groove 4221 is provided on the inner tube 422, the marble 423 is located in the groove 4221, and the depth of the groove 4221 is smaller than the diameter of the marble 423, so that when the marble 423 is placed inside the groove 4221, a part of the marble 423 is located outside the groove 4221. Correspondingly, the upper sleeve 410 is provided with a clamping groove 411, when the upper sleeve 410 is inserted into the lower sleeve 420, the part of the marble 423 outside the groove 4221 is clamped into the clamping groove 411, so that the upper sleeve 410 is rotatably sleeved in the lower sleeve 420.
FIG. 5 is an enlarged view of a rotary joint I of the argon arc welding back atmosphere protection device for the shell provided in FIG. 4. As shown in fig. 5, the opening width L of the groove 4221 is smaller than the diameter of the marble 423 to ensure that the marble 423 does not fall out during use.
Further, as shown in fig. 5, a protrusion 4113 is disposed between one end of the upper casing 410 away from the shielding gas head 300 and the slot 411, and one side of the protrusion 4113 away from the shielding gas head 300 is in smooth transition with an outer surface of the upper casing 410. During the process of inserting the upper casing 410 into the lower casing 420, the pressure applied to the ball 423 is gradually increased along with the change of the outer surface of the protrusion 4113, which is more beneficial for the ball 423 to be clamped into the clamping groove 411.
Optionally, a notch 4222 corresponding to the protrusion 4113 is provided on the inner wall of the inner tube 422 of the lower casing 420 to avoid the protrusion 4113.
Optionally, the clamping groove 411 is arranged along the circumferential direction of the upper casing 410, and includes a clamping groove bottom 4111 and a side wall 4112, an included angle between one side of the protrusion 4113 close to the protection gas head 300 and the clamping groove bottom 4111 is greater than 150 degrees, so that the marble 423 is disengaged from the clamping groove 411, and the quick disassembly of the upper casing is realized.
Preferably, an angle between one side of the protrusion 4113 close to the shielding gas head 300 and the bottom of the slot 411 is 166 degrees.
Use marble 423 and draw-in groove 411 complex plug-in rotary joint in this embodiment, the quick replacement of various protection gas heads 300 of being convenient for, the commonality is good, improves machining efficiency.
FIG. 6 is a top view of a rotary joint of a back atmosphere protection device for argon arc welding of a housing according to an embodiment of the present invention. As shown in fig. 3 and fig. 6, a screw 412 is disposed at one end of the rotary joint 400 connected to the shielding gas head 300, the connection hole 312 of the shielding gas head 300 is a screw hole matched with the screw 412, and when in use, the screw 412 is screwed into the connection hole 312, so that the detachable connection between the rotary joint 400 and the shielding gas head 300 can be realized.
Optionally, as shown in fig. 4, a handle 413 is disposed on the upper sleeve 410 of the rotary joint 400 to facilitate the threaded connection between the rotary joint 400 and the shielding gas head 300.
Preferably, as shown in fig. 6, the handle 413 is provided in a hexagonal configuration for better gripping effort.
FIG. 7 is a sectional view of a shielding gas head of an argon arc welding back atmosphere shielding device for a housing according to an embodiment of the present invention; FIG. 8 is a top view of a shielding gas head of a back atmosphere shielding apparatus for argon arc welding of a housing according to an embodiment of the present invention. As shown in fig. 7 and 8, the body 310 of the shielding gas head 300 is provided with a fixing groove 314 having the same size as the external shape of the porous gas outlet plate 320, the bottom edge of the fixing groove is provided with at least two threaded holes 313, the corresponding position of the porous gas outlet plate 320 is provided with a through hole, and the fixing groove 314 and the porous gas outlet plate 320 are connected with the threaded holes 313 through the through hole by a screw 315.
FIG. 9 is a schematic plan view illustrating an installation of a back atmosphere protection device for argon arc welding of a housing according to an embodiment of the present invention. As shown in fig. 3 and 9, the through holes of the porous gas outlet plate 320 are countersunk holes, and the screws 315 are also countersunk screws, so that the surface of the porous gas outlet plate 320 after the screws 315 are installed is flat and is convenient for contacting with a workpiece.
Preferably, as shown in fig. 8, four corners of the gas storage tank 311 are rounded to facilitate the flow of argon gas in the gas storage tank 311.
Preferably, the radius of the four rounded corners of the air storage tank 311 is 1.5-2.5 mm, preferably 2 mm. The fillet radius is too small, which weakens the effect of fillet flow guiding, and the fillet radius is too large, which occupies too much space and affects the gas storage function of the gas storage tank 311.
Preferably, the depth of the air storage tank 311 is 4 to 6mm, preferably 5 mm. The gas storage tank 311 is too shallow to facilitate gas diffusion, and the argon introduced from the connecting hole 321 is pressed out of the gas outlet holes in time to diffuse, which results in insufficient gas output of the gas outlet holes 321 at two ends. The gas storage tank 311 is disposed too deep, which results in waste of gas.
FIG. 10 is a cross-sectional view of a shielding gas head of a back atmosphere shielding device for argon arc welding of a housing according to an embodiment of the present invention. As shown in fig. 10, the shield gas head 300 in the present embodiment is a type of shield gas head for T-seam welding. One end of the section of the protective gas head 300 is of a rectangular structure, one side of the rectangular structure is connected with a trapezoidal structure, the fixing groove 314 and the gas storage groove 311 are sequentially arranged on the short side of the trapezoidal structure, and one side of the rectangular structure, which is far away from the trapezoidal structure, is provided with a connecting hole 312 connected with the gas storage groove 311.
FIG. 11 is a schematic view of a shielding gas head of a back atmosphere protection device for argon arc welding of a housing according to an embodiment of the present invention. As shown in fig. 11, two trapezoidal sides of the trapezoidal structure of the shielding gas head 300 are attached to the workpiece, and the main body 310 of the shielding gas head 300 and the workpiece form a shielding atmosphere region 21. The shielding gas head 300 continues to provide argon gas to the shielding gas zone while welding at the weld joint 22, providing back atmosphere shielding.
The shape of the shielding gas head 300 can be set to different shapes and sizes according to actual requirements, and is not limited to the embodiment.
Further, the vent elbow 200 is a metal bellows. The metal corrugated pipe can be bent, and the connection angle of the ventilation straight pipe 100 and the protective gas head 300 can be adjusted, so that the metal corrugated pipe is suitable for workpieces with cavities of various sizes.
Alternatively, as shown in fig. 3, both ends of the metal bellows 200 are provided with a first nut 210 and a second nut 220. One end of the metal corrugated pipe 200 is connected to the end of the lower sleeve 420 of the rotary joint 400 through a first nut 210, and the other end of the metal corrugated pipe 200 is connected to the end of the straight ventilation pipe 100 through a second nut 220.
In order to facilitate understanding of the present invention, the following describes the usage of the device for protecting the back surface of the shell by argon arc welding.
1. The vent elbow 200 is manually bent to a required angle to ensure that the atmosphere protecting device does not interfere with the inner cavity part of the shell;
2. the ventilation straight pipe 100 is held by hand to ensure that the device protection gas head 300 is tightly attached to the back of the welding seam of the external flow passage of the intercooler shell, and the head is tightly attached to the two side walls as much as possible;
3. the method comprises the steps of welding in sections, welding on the front side, carrying out back atmosphere protection, continuously introducing protective gas 2min before welding, removing air in an air passage, attaching a protective gas head 300 to the back of a welding line of an external flow passage of the intercooler shell, moving an atmosphere protection device while welding, and synchronously operating two persons to ensure that the back of each section of welding line is fully protected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The back atmosphere protection device for the shell argon arc welding is characterized by comprising a ventilation straight pipe (100), a ventilation elbow (200) and a protection gas head (300);
one end of the ventilation straight pipe (100) is used for being connected with an air outlet hose of the air storage device;
one end of the vent elbow (200) is connected with the other end of the vent straight pipe (100), and the other end of the vent elbow (200) is detachably connected with the protective gas head (300);
the protective gas head (300) comprises a body (310) and a porous gas outlet plate (320),
an air storage groove (311) is formed in one end, far away from the ventilating elbow (200), of the body (310), a connecting hole (312) is formed in the bottom of the air storage groove (311), the connecting hole (312) is used for being connected with the ventilating elbow (200), and the porous air outlet plate (320) is connected to the opening end of the air storage groove (311); a plurality of air outlet holes (321) are uniformly arranged on the porous air outlet plate (320) at intervals;
the back atmosphere protection device further comprises a rotary joint (400), the vent elbow (200) is detachably connected with the rotary joint (400), and the vent elbow (200) is connected with the connecting hole (312) through the rotary joint (400); the rotary joint (400) can rotate around the axial direction of the connecting hole (312);
a screw nozzle (412) is arranged at one end of the rotary joint (400) connected with the protective gas head (300), and a connecting hole (312) of the protective gas head (300) is a screw hole matched with the screw nozzle (412);
the four corners of the air storage tank (311) are rounded corners, and the radius of the four rounded corners of the air storage tank (311) is 1.5-2.5 mm;
protection gas head (300) are used for T type weld welding, the one end in protection gas head (300) cross-section is the rectangle structure, a trapezium structure is connected on one side of rectangle structure, gas receiver (311) set up on the minor face of trapezium structure, the rectangle structure is kept away from one side of trapezium structure is equipped with the connection gas receiver (311) connecting hole (312).
2. The backside atmosphere protection device according to claim 1, wherein the rotary joint (400) comprises an upper sleeve (410) and a lower sleeve (420), the upper sleeve (410) is sleeved in the lower sleeve (420) and can rotate 360 degrees around the axial direction of the lower sleeve (420).
3. The backside atmosphere protection device according to claim 2, wherein the lower sleeve (420) of the rotary joint (400) comprises an outer tube (421), an inner tube (422) and a marble (423), the outer tube (421) is sleeved and fixed outside the inner tube (422), a groove (4221) is provided on the inner tube (422), the marble (423) is located in the groove (4221), and the depth of the groove (4221) is smaller than the diameter of the marble (423); the upper sleeve (410) is provided with a clamping groove (411), and when the upper sleeve (410) is inserted into the lower sleeve (420), the part of the marble (423) outside the groove (4221) is clamped into the clamping groove (411).
4. The back atmosphere protection device according to claim 3, wherein the groove (4221) has an opening width smaller than the diameter of the marble (423).
5. The back atmosphere protection device according to claim 3, wherein a protrusion (4113) is provided between one end of the upper sleeve (410) away from the shielding gas head (300) and the slot (411), and one side of the protrusion (4113) away from the shielding gas head (300) is in smooth transition with the outer surface of the upper sleeve (410).
6. The backside atmosphere protection device according to claim 5, wherein the slot (411) is disposed along a circumferential direction of the upper sleeve (410), the slot (411) comprises a slot bottom (4111) and a side wall (4112), and an angle between one side of the protrusion (4113) close to the shielding gas head (300) and the slot bottom (4111) is greater than 150 degrees.
7. The back atmosphere protection device according to any one of claims 1 to 6, wherein the body (310) of the protection gas head (300) is provided with a fixing groove (314) having the same size as the external shape of the porous gas outlet plate (320), the bottom edge of the fixing groove (314) is provided with at least two threaded holes (313), the corresponding position of the porous gas outlet plate (320) is provided with a through hole, and the fixing groove (314) and the porous gas outlet plate (320) are connected through the through hole and the threaded hole (313) by a screw (315).
8. The backside atmosphere protection device according to any of claims 1 to 6, wherein the depth of the gas storage groove (311) is 4 to 6 mm.
9. The backside atmosphere protection device according to any of claims 1-6, wherein the vent bend (200) is a metal bellows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910002823.0A CN109623112B (en) | 2019-01-02 | 2019-01-02 | Back atmosphere protection device for argon arc welding of shell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910002823.0A CN109623112B (en) | 2019-01-02 | 2019-01-02 | Back atmosphere protection device for argon arc welding of shell |
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| CN109623112A CN109623112A (en) | 2019-04-16 |
| CN109623112B true CN109623112B (en) | 2021-11-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110977120A (en) * | 2019-12-25 | 2020-04-10 | 安徽应流铸业有限公司 | Tool design method for preventing argon arc welding from causing oxidation of back surface of test plate |
| CN110961769A (en) * | 2019-12-30 | 2020-04-07 | 洛阳师范学院 | Pipeline welding protection robot |
| CN111872519B (en) * | 2020-08-27 | 2024-05-14 | 湖南湘投金天新材料有限公司 | Control device and method for weld seam surplus height in straight welded pipe |
| CN115488477B (en) * | 2022-10-11 | 2023-07-28 | 广州纬华节能设备有限公司 | Gas shield welding device and method |
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