CN113681135A - Telescopic nozzle capable of spraying stable airflow for gas shielded welding and use method thereof - Google Patents
Telescopic nozzle capable of spraying stable airflow for gas shielded welding and use method thereof Download PDFInfo
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- CN113681135A CN113681135A CN202111020836.4A CN202111020836A CN113681135A CN 113681135 A CN113681135 A CN 113681135A CN 202111020836 A CN202111020836 A CN 202111020836A CN 113681135 A CN113681135 A CN 113681135A
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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
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
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Abstract
The invention discloses a telescopic nozzle capable of spraying stable airflow for gas shielded welding. The nozzle comprises a nozzle seat, a telescopic sleeve, an air screen and a locking nut or a locking protective sleeve. The upper part of the telescopic sleeve is provided with an intermittent external thread, the inner upper part of the telescopic sleeve is provided with an air screen, and a nozzle telescopic adjustment scale is arranged between intermittent thread sections; the upper external thread of the telescopic sleeve is in telescopic threaded connection with the internal thread of the nozzle seat; the locking nut or the locking protective sleeve works on the lower section of the external thread on the upper part of the telescopic sleeve to lock the telescopic threaded connection, and the locking protective sleeve can also play a role of protecting the unmeshed external thread on the lower section of the external thread on the upper part of the telescopic sleeve; the length of the nozzle can be adjusted in a telescopic mode by rotating the telescopic sleeve. The nozzle has the functions of locking, welding splashing prevention, dust prevention, quantitative adjustment and the like, and has the advantages of simple structure, capability of spraying stable protective gas flow, good welding gas protection effect, convenience in use and strong practicability.
Description
Technical Field
The invention belongs to the technical field of electric arc welding, and relates to a telescopic nozzle capable of spraying stable airflow for gas shielded welding and a using method thereof.
Background
In gas-shielded arc welding of narrow grooves or narrow gaps or fillets, the conducting rod or electrode often needs to be extended into the depth of the groove to guide the arc to weld at the deeper part of the groove. In the multi-layer welding process, the length of the external sleeve-shaped nozzle is often required to be adjusted while the position of the welding torch is lifted, so that the distance from the lower end face of the nozzle to the surface of a workpiece (namely the height of the nozzle) is kept constant, and a good gas shielding effect is obtained.
The utility model discloses a utility model patent with publication number CN205869680U, which discloses a gas shielded welding nozzle with adjustable length, comprising a nozzle body and a variable-diameter nozzle arranged on the nozzle body, wherein the length of the variable-diameter nozzle extending out of the nozzle body is changed by adjusting the thread between the nozzle body and the variable-diameter nozzle, so as to realize the adjustment of the nozzle length; the disadvantages are as follows:
(1) the variable-diameter nozzle at the tail end of the nozzle is not provided with the gas screen, so that the length of a laminar flow layer of gas sprayed out of the nozzle is not constant in the length adjustment process of the nozzle, and the stability of electric arc and the protection effect of welding gas are influenced; (2) when the head of the variable-diameter nozzle is provided with the additional hole, the length of the overlapped part between the nozzle body and the variable-diameter nozzle (which is equivalent to the length of a nozzle sleeve of secondary shielding gas) is correspondingly changed along with the change of the length of the nozzle, so that the length of a laminar flow layer of the secondary shielding gas sprayed out of the additional hole is not constant, and particularly, when the nozzle extends out for a long time, the length of the nozzle sleeve of the secondary shielding gas and the length of the laminar flow layer are shortened on the contrary, so that stable and effective secondary gas shielding is difficult to form on a welding area in a groove; (3) when the head of the nozzle with the variable diameter is provided with the additional hole, the welding protective gas is shunted, so that the stability and the welding protective effect of the primary protective gas sprayed out of the nozzle are directly influenced; (4) when the nozzle is used for narrow-gap welding, the cylindrical nozzle is placed outside the groove for use, and an adjustable nozzle with a larger cross section can be directly adopted without space limitation, so that the variable-diameter nozzle provided with a complex additional hole is not needed; (5) when the cylindrical nozzle is placed outside the narrow gap welding slope for use, the gas outlet of the cylindrical nozzle is circular, so that the effective flow of welding shielding gas flowing into the I-shaped or U-shaped narrow gap slope is reduced, and the gas shielding effect of narrow gap welding is influenced; (6) locking measures are not taken for the threaded connection, so that the adjustable nozzle is easy to shake, and the stability of airflow sprayed out by the nozzle is influenced; (7) the scale marks for telescopic adjustment of the nozzle are not arranged, so that quantitative adjustment is inconvenient.
Disclosure of Invention
The present invention is directed to overcome the above problems and disadvantages of the prior art, and to provide a retractable nozzle for gas shielded welding capable of ejecting a stable gas flow and a method of using the same.
The invention achieves the purposes and effects of preventing dust, welding spatter and quantitatively adjusting the nozzle telescopic sleeve by arranging the nozzle telescopic sleeve into a round funnel shape or an upper round and a lower flat shape, arranging the air screen in the nozzle telescopic sleeve and arranging the locking nut or the locking protective sleeve outside the nozzle telescopic sleeve. The invention has simple structure, can spray stable protective gas flow, has good protective effect of welding gas, convenient use and strong practicability, and ensures that the nozzle has the functions of locking, quantitative adjustment, welding splash prevention, dust prevention and the like.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
A telescopic nozzle capable of spraying stable airflow for gas shielded welding comprises a nozzle holder 1, a telescopic sleeve, a gas screen 3 and a locking nut 4 or a locking protective sleeve 5, wherein the nozzle holder 1 is a hollow tubular body provided with internal threads, and the head of the nozzle holder is provided with a flanging flange 101 or external threads; the telescopic sleeve is a hollow straight tubular body, the upper part of the telescopic sleeve is provided with external threads, and an inner cavity with a circular cross section at the upper part is internally provided with an air screen 3; the locking protective sleeve 5 is a hollow sleeve body, the upper part of the locking protective sleeve is provided with a first inner flange 501 with internal threads, and the lower part of the locking protective sleeve is provided with a central through hole which is in a straight cylinder shape or a stepped cylinder shape with a large upper part and a small lower part; the telescopic sleeve forms telescopic threaded connection with the internal thread of the nozzle holder 1 through the external thread at the upper part of the telescopic sleeve, and the locking nut 4 or the locking protective sleeve 5 is screwed on the external thread at the upper part of the telescopic sleeve and is in locking connection or sealing locking connection with the lower end surface of the nozzle holder 1 and the external thread at the upper part of the telescopic sleeve.
Optionally, the lower section of the external thread on the upper part of the telescopic sleeve is an interrupted thread, and the internal thread of the locking nut 4 or the locking protective sleeve 5 works on the interrupted thread.
Preferably, the outer surface between the sections of the interrupted thread is a smooth arc surface or a platform surface with residual threads, and the smooth arc surface or the platform surface is provided with the telescopic adjusting scales of the nozzle.
Preferably, the interrupted thread is provided in even number segments when the outer surface between the segments of the interrupted thread is the plateau.
Preferably, the interrupted thread is provided in 2 or 3 or 4 segments.
Preferably, the air screen 3 is fixedly connected with the inner cavity of the upper part of the telescopic sleeve 2 in an interference fit mode.
Preferably, the telescopic sleeve is a round funnel-shaped first telescopic sleeve 2, the round cross section of the upper large inner cavity is larger than that of the lower small inner cavity, and a contraction type transition section is arranged between the upper part and the lower part of the telescopic sleeve; or, the telescopic sleeve is a cylindrical second telescopic sleeve 7, an external thread is arranged on the upper part 701 of the telescopic sleeve, and the inner diameter D of the upper port of the inner cavity of the telescopic sleeve is1Greater than the inner diameter D of the lower opening2(ii) a Or the telescopic sleeve is a third telescopic sleeve 8 which is round at the upper part and flat at the lower part, the upper part 801 of the third telescopic sleeve is provided with external threads, the lower part 803 of the third telescopic sleeve is a flat cylinder body provided with a waist-shaped through hole, and a contraction type transition section 802 is arranged between the upper part and the lower part.
Preferably, when the first telescopic pipe 2 is matched with a locking protective sleeve 5 with a cylindrical central through hole with a big upper part and a small lower part in a stepped manner, the locking protective sleeve is lockedThe length of the big hole of the sleeve at the lower part of the sheath 5 is L1Let L be1≥(L3+L4) Wherein L is3The maximum length of the non-meshed thread section in the lower section of the external thread on the upper part of the first telescopic pipe 2 is L4Is the length of the outline contraction transition section between the upper part and the lower part of the first telescopic tube 2.
Preferably, when the telescopic sleeve is matched with the locking protective sleeve 5 with a straight cylindrical central through hole at the lower part, the length of the central through hole at the lower part of the locking protective sleeve 5 is not less than the maximum length of the section of the unmeshed thread in the lower section of the external thread at the upper part of the telescopic sleeve.
In order to achieve the above purpose, the present invention is realized by adopting another technical scheme as follows.
A use method of a telescopic nozzle capable of spraying stable gas flow for gas shielded welding specifically comprises the following steps:
(1) after a welding torch conducting rod or a welding torch electrode penetrates out of the inner cavity of the nozzle, the welding torch conducting rod or the welding torch electrode is fixedly connected with a welding torch body in a screw connection mode through the flanging flange 101 at the top end of the nozzle seat 1; or when the flanging flange 101 is not arranged at the top end of the nozzle holder 1, the nozzle holder 1 and the welding torch body are quickly fixedly connected in a threaded connection mode through the external threads or the internal threads of the head of the nozzle holder 1;
(2) before welding, loosening the locking nut 4 or the locking protective sleeve 5 according to needs, rotating the telescopic sleeve, and realizing quantitative telescopic adjustment of the nozzle by measuring the distance from the lower end face of the telescopic sleeve to the surface of a workpiece, namely measuring the height of the nozzle, or observing the telescopic adjustment scale on the outer side of the lower section of the upper part of the telescopic sleeve; during welding, welding protective gas flows in from the upper port of the nozzle and flows out from the lower port of the nozzle, namely flows in from the upper port of the nozzle seat 1 and flows out from the lower port of the telescopic sleeve;
(3) when the telescopic sleeve needs to be replaced, after the locking nut 4 or the locking protective sleeve 5 is unscrewed, the telescopic sleeve is directly unscrewed from the lower end of the nozzle seat 1 so as to replace the telescopic sleeve.
Compared with the prior art of the same type, the invention has the advantages and beneficial effects that:
1) the gas sieve is arranged in the sleeve at the tail end of the telescopic nozzle, so that the distance from the gas sieve to the lower end face of the nozzle is kept constant, the laminar flow layer of sprayed gas in the nozzle is fixed in length, and the stability of an electric arc and the protection effect of welding gas are improved.
2) The telescopic threaded connection between the nozzle telescopic sleeve and the nozzle seat is locked through the locking nut (or the locking protective sleeve), so that the meshing gap between the threaded connection surfaces of the telescopic sleeve and the nozzle seat can be effectively reduced or eliminated, the leakage of gas in the nozzle from the threaded connection gap is reduced or prevented, and the welding gas protection effect is improved.
3) The cross section of the inner upper part of the sleeve at the tail end of the nozzle is larger than that of the inner lower part of the sleeve, and a smooth transition section is arranged between the inner upper part and the inner lower part of the sleeve to form a convergent telescopic nozzle, so that the welding gas protection effect is improved.
4) The outer protective sleeve effect that the locking protective sleeve formed to nozzle telescopic tube can prevent dust and prevent welding and splash the protection to the non-meshing screw thread section on the nozzle telescopic tube that exposes outside nozzle block lower extreme plane, has improved the practicality.
5) The nozzle telescopic sleeve is set to be a hollow tubular body which is round at the upper part and flat at the lower part, and the long edge of the waist-shaped air outlet at the lower end of the nozzle telescopic sleeve is parallel to the narrow gap welding direction, so that the effective protective gas flow flowing into the narrow gap slope can be increased, and the protective effect of the narrow gap welding gas is improved.
6) The intermittent threads are arranged on the external thread section of the nozzle telescopic sleeve, so that dust accumulation between external thread teeth can be reduced, the rotation adjusting resistance of a locking nut (or a locking protective sleeve) working on the external thread section is reduced, and the practicability is improved.
7) When the external thread section of the nozzle telescopic sleeve is provided with the intermittent threads, the telescopic adjusting scales are arranged on the smooth surface between the intermittent thread section and the section, so that quantitative adjustment can be realized, and the practicability is improved.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention. In the figure, 1 — nozzle holder; 101-flanging flange; 2-a first telescopic tube; 3, air sieving; 301 — an exit hole for a torch contact pin or a torch electrode; and 4, locking the nut.
Fig. 2 is an embodiment of a cylindrical telescopic tube. In the figure, 7 — the second telescopic tube; 701 — the upper part of the second telescopic tube 7; d1The diameter of the upper mouth of the inner cavity of the second telescopic tube 7; d2The diameter of the lower opening of the lumen of the second telescopic tube 7.
Fig. 3 shows an embodiment of a telescopic tube with a round upper part and a flat lower part. In the figure, 8-the third telescopic tube; 801 — upper part of third telescopic tube 8; 802 — a shrink-type transition section of the third telescopic tube 8; 803 — lower part of the third telescopic tube 8.
Fig. 4 shows an embodiment of the connection relationship between the locking sheath and the telescopic tube. In the figure, 5-locking protection sleeve; 501-first inner flange; 502 — a second inner flange; l is1-locking the length of the large hole of the sleeve below the protective sleeve; l is2-locking the length of the aperture of the sleeve below the protective sheath; l is3-the maximum length of the section of unengaged threads in the upper external thread of the first telescopic tube 2; l is4The length of the externally narrowing transition between the upper and lower parts of the first telescopic tube 2.
Figure 5 is an embodiment of a telescoping tube provided with a first interrupted thread. In the drawings, 2a — the first interrupted thread; 2 b-smooth arc surface; 2 c-telescopic adjustment scale; l is5The length of the top full thread section of the first telescopic tube 2.
Figure 6 is a telescoping tube embodiment provided with a second interrupted thread. In the figure, 2d — the second interrupted thread; 2e — the platform surface.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention.
As shown in fig. 1 to 6, the retractable nozzle for gas shielded welding capable of ejecting a stable gas flow according to the present invention includes a nozzle holder, a retractable sleeve, a gas screen, and a lock nut or a lock sheath, and is suitable for gas shielded welding with consumable electrode or non-consumable electrode. Wherein the telescopic sleeve is a hollow straight tubular body; the nozzle seat is in telescopic threaded connection with the telescopic sleeve; the air screen is arranged at the upper part (including the top end) of the inner cavity of the telescopic sleeve; the locking nut has a locking effect on the telescopic threaded connection; the locking protective sleeve can replace the locking function of the locking nut, and meanwhile, the protective sleeve can provide the dustproof and welding spatter-proof protective function for the section of the unengaged thread in the extension section of the telescopic sleeve. Preferably, the cross section of the air inlet at the upper end of the telescopic sleeve is larger than that of the air outlet at the lower end of the telescopic sleeve, so that a convergent telescopic nozzle is formed, and the welding gas protection effect is improved.
Example 1:
as shown in fig. 1, a retractable nozzle for gas shielded welding capable of ejecting a stable gas flow includes a nozzle holder 1, a first retractable sleeve 2, a gas screen 3, and a lock nut 4. Wherein, the nozzle seat 1 is a hollow tubular body provided with internal threads, and the top of the nozzle seat is provided with a flange 101; the first telescopic tube 2 is a round funnel-shaped hollow tubular body, the upper part of the first telescopic tube is provided with external threads, the inner cavity of the first telescopic tube is round funnel-shaped, the upper part of the inner cavity can be provided with a chamfer as shown in figure 1, the upper part (which can be arranged from top to top) of the inner cavity is provided with an air screen 3, and the center of the air screen 3 is provided with a penetrating hole 301 of a welding torch conducting rod or a welding torch electrode; the air screen 3 is preferably fixedly connected with the upper part of the inner cavity of the first telescopic sleeve 2 in an interference fit manner and can be stopped at an inner convex table surface (not shown) of the inner cavity of the air screen downwards; the first telescopic tube 2 can sequentially comprise an upper part, a transition section and a lower part from top to bottom, wherein the circular cross section of the inner cavity of the upper part is larger than that of the inner cavity of the lower part, and a smooth convergence type transition section is arranged between the upper part and the lower part.
The funnel neck (air outlet end) of the first telescopic sleeve 2 is downward, and is screwed in from the lower end of the nozzle seat 1 through the external thread at the upper part of the funnel neck, and is in telescopic threaded connection with the internal thread of the nozzle seat 1, so that the length of the first telescopic sleeve 2 extending out from the lower end of the nozzle seat 1 is adjustable; the locking nut 4 is screwed upwards on the lower section of the external thread on the upper part of the first telescopic sleeve 2 and is in locking connection or sealing locking connection with the lower end surface of the nozzle seat 1 and the lower section of the external thread on the upper part of the first telescopic sleeve 2, so that the telescopic threaded connection between the first telescopic sleeve 2 and the nozzle seat 1 is in a locking state.
Alternatively, a second telescopic tube 7 is used instead of the first telescopic tube 2. As shown in FIG. 2, the second telescopic tube 7 is a cylindrical hollow tube body, an external thread is provided on the upper part 701 of the second telescopic tube 7, and the diameter D of the upper opening of the inner cavity of the second telescopic tube 71Slightly larger than the diameter D of the lower opening of the inner cavity2So that the cross section of the air inlet at the upper end of the inner cavity is slightly larger than that of the air outlet at the lower end of the inner cavity, thereby forming a convergent nozzle. The second telescopic tube 7 is connected with the nozzle holder 1, the air screen 3 and the locking nut 4 in a similar manner as the first telescopic tube 2.
Alternatively, a third telescopic tube 8 is used instead of the first telescopic tube 2. As shown in fig. 3, the third telescopic tube 8 is a hollow tubular body with a round upper part and a flat lower part, the upper part 801 of the third telescopic tube is provided with external threads, the lower part 803 of the third telescopic tube is a flat column body provided with a waist-shaped through hole, and a contraction type transition section 802 is arranged between the upper part and the lower part to form a convergent type nozzle. The third telescopic tube 8 is connected with the nozzle holder 1, the air screen 3 and the locking nut 4 in a manner similar to that of the first telescopic tube 2. When the third telescopic sleeve 8 which is round at the upper part and flat at the lower part is adopted, the long edge of the waist-shaped air outlet at the lower end is parallel to the narrow gap welding direction, so that the effective protective gas flow flowing into the narrow gap slope can be increased, and the protective effect of the narrow gap welding gas is improved.
Example 2:
on the basis of the embodiment 1, a locking protective sleeve 5 is adopted to replace a locking nut 4, and the rest of the structure of the nozzle is the same as that of the embodiment 1. An embodiment of the connection of the locking sock 5 to the first telescopic tube 2 is shown in figure 4. The locking protective sleeve 5 is a hollow sleeve body, the upper part (head part) of the locking protective sleeve is provided with an internal thread matched with the external thread on the upper part of the first telescopic sleeve 2, the lower part of the locking protective sleeve is provided with a central through hole for movably penetrating and installing the first telescopic sleeve 2, and the central through hole is a cylindrical (not shown) or a unthreaded hole with a big top and a small bottom step cylindrical shape (see figure 4); the head of the locking protective sleeve 5 is upwards screwed on the lower section of the external thread on the upper part of the first telescopic sleeve 2 and forms locking connection or sealing locking connection with the lower end surface of the nozzle seat 1 and the external thread on the upper part of the first telescopic sleeve 2, so that the lower part of the first telescopic sleeve 2 extends out from the lower end of the locking protective sleeve 5, and the telescopic threaded connection between the first telescopic sleeve 2 and the nozzle seat 1 is in a locking state. The locking protective sleeve 5 is preferably cylindrical in shape, the outer lower end of the locking protective sleeve can be provided with a chamfer, and the outer side face of the locking protective sleeve can be provided with a knurl.
As shown in fig. 4, when the central through hole at the lower part of the locking protection sleeve 5 is a cylindrical unthreaded hole with a big top and a small bottom, the length of the big top hole of the unthreaded hole is L1The length of the bottom small hole is L2，L3The maximum length of the section of the non-meshed thread in the external thread at the upper part of the first telescopic pipe 2, L4The length of the outline contraction transition section between the upper part and the lower part of the first telescopic tube 2; wherein L is1≥(L3+L4) When the first telescopic tube 2 extends downwards to the maximum length (the situation shown in fig. 4), the locking protective sleeve 5 can completely cover the maximum length L in the lower section of the external thread at the upper part of the first telescopic tube 2 while playing a locking role3The unengaged thread segments of (a). When L is2When the diameter of the central through hole is 0, the central through hole at the lower part of the locking protective sleeve 5 is a straight cylindrical unthreaded hole, and the unthreaded hole length L is equal to the diameter of the straight cylindrical unthreaded hole1Not less than the maximum length L of said unengaged thread segments3I.e. L1≥L3. Accordingly, for the section of the non-engaged external thread in the lower upper external thread section of the first telescopic tube 2, the lower sleeve of the locking protection sleeve 5 acts as an external active protection sleeve, so that the nozzle has a self-protection function against welding spatter and smoke.
Similar to the embodiment 1 described above, the first telescopic tube 2 may be replaced with a second telescopic tube 7 or a third telescopic tube 8. When the second telescopic sleeve 7 or the third telescopic sleeve 8 is used for replacing the first telescopic sleeve 2, the locking protective sleeve 5 with the lower central through hole in a straight cylinder shape is matched, and the length of the straight cylinder-shaped unthreaded hole of the lower sleeve of the locking protective sleeve 5 is not less than the maximum length of the non-meshed thread section. The rest of the structure and the connection of the nozzle are the same as or similar to those of the embodiment 1.
In the embodiments 1 and 2 of the retractable nozzle, when the above-mentioned sealing and locking connection is adopted, the upper end surface of the locking nut 4 or the locking protective sleeve 5 may be in sealing connection with the lower end surface of the nozzle holder through a sealing ring or a sealing gasket, and the internal thread of the locking nut 4 or the locking protective sleeve 5 may be in sealing threaded connection with the external thread teeth on the upper portion of the retractable sleeve through a filling sealing material.
When the locking connection is adopted, intermittent threads can be arranged on the lower section of the external threads on the upper part of the telescopic sleeve, and the locking nut 4 or the locking protective sleeve 5 can work on the intermittent thread sections. Preferably, the interrupted thread can be equally divided into 2 sections, 3 sections or 4 sections, and the outer surface between the sections is a smooth cambered surface or a platform surface with residual threads; when the outer surface between the discontinuous thread section and the segments is the platform surface, the number of the segments can be preferably even segments so as to facilitate processing; on smooth cambered surface or the platform face, can set up the flexible scale of adjusting of nozzle to make things convenient for quantitative regulation, thereby make the nozzle has quantitative regulation's function.
The mode of providing the intermittent screw thread will be described by taking the example of providing the intermittent screw thread on the first telescopic tube 2. As shown in fig. 5 and 6, the interrupted threads each comprise 3 equal segments for ease of comparison. Fig. 5 is a situation when a smooth arc is present between the interrupted thread segments and the segments, respectively, the outer surface between the segments of the first interrupted thread 2a is a smooth arc 2 b; fig. 6 shows the situation when a plateau is present between the interrupted thread segments and the segments, and correspondingly the outer surface between the segments of the second interrupted thread 2d is a plateau 2 e. Wherein, the flexible scale 2c of adjusting of nozzle sets up on smooth cambered surface 2b or platform face 2e, and the full thread section length of first telescope tube 2 upper portion upper segment is L5. For the second telescopic tube 7 or the third telescopic tube 8, the interrupted thread can be provided in a similar way.
The intermittent threads can remarkably reduce the accumulation of welding smoke dust between the lower teeth of the upper external thread of the telescopic sleeve, reduce the rotating resistance of the locking nut 4 or the locking protective sleeve 5 and improve the practicability. Furthermore, through the telescopic tubeA full-thread section engaged between the upper section and the nozzle holder 1, e.g. the length of the engagement between the upper section of the first telescopic tube 2 and the nozzle holder 1 is L5The full thread section can keep a better airtight state between the meshing thread teeth under the locking action of the locking nut 4 or the locking protective sleeve 5 so as to reduce the leakage of welding protective gas.
In the embodiments 1 and 2 of the retractable nozzle, the air screen 3 is arranged in the end sleeve of the retractable nozzle, namely, in the upper part (including the top end) of the inner cavity of the retractable sleeve, on one hand, the distance between the air screen 3 and the lower end face of the air outlet of the nozzle is not changed, so that the laminar flow layer length of the gas sprayed out of the nozzle is kept constant; on the other hand, an even pressure area is formed in the area of the nozzle above the air screen 3, the pressure of the protective gas in the even pressure area is higher, and the flow rate is slower, so that the gas sealing requirement on the connecting surface at the top end of the nozzle and the movable connecting interface in the nozzle can be reduced, and air can be effectively prevented from being drawn into the gas path in the nozzle from the connecting interface. In addition, it is right through lock nut 4 or locking protective sheath 5 scalable threaded connection locks, or makes lock nut 4 or locking protective sheath 5 and form the aforesaid between its connection face simultaneously sealed locking connection can effectively reduce or eliminate the meshing clearance between the threaded connection face, reduces or prevents the interior gas of nozzle from leaking from threaded connection clearance department. Thus, arc stability and welding gas shielding effect are improved.
The invention discloses a using method of a telescopic nozzle capable of spraying stable airflow for gas shielded welding, which comprises the following steps:
1) after a welding torch conducting rod or a welding torch electrode penetrates out of the inner cavity of the nozzle, the welding torch conducting rod or the welding torch electrode is fixedly connected with a welding torch body in a screw connection mode through the flanging flange 101 at the top end of the nozzle seat 1; or when the flanging flange 101 is not arranged at the top end of the nozzle holder 1, the nozzle holder 1 and the welding torch body are quickly fixedly connected in a threaded connection mode through the external threads or the internal threads of the head of the nozzle holder 1;
2) before welding, loosening the locking nut 4 or the locking protective sleeve 5 according to needs, rotating the telescopic sleeve, and measuring the distance from the lower end face of the telescopic sleeve to the surface of a workpiece, namely measuring the height of a nozzle, or observing the telescopic adjusting scale on the outer side of the lower section of the upper part of the telescopic sleeve to realize quantitative telescopic adjustment of the nozzle; during welding, welding protective gas flows in from the upper port of the nozzle and flows out from the lower port of the nozzle, namely flows in from the upper port of the nozzle seat 1 and flows out from the lower port of the telescopic sleeve;
3) due to reasons such as welding ablation, when the telescopic sleeve needs to be replaced, after the locking nut 4 or the locking protective sleeve 5 is unscrewed, the telescopic sleeve is directly unscrewed from the lower end of the nozzle seat 1, so that the new telescopic sleeve can be replaced quickly.
In addition, the present invention has many specific implementations and ways, and the above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. The utility model provides a gas shielded arc welding that can spout steady gas flow uses scalable nozzle, the nozzle includes nozzle holder (1), telescope tube, gas sieve (3) and lock nut (4) or locking protective sheath (5), characterized by: the nozzle seat (1) is a hollow tubular body provided with internal threads, and the head of the nozzle seat is provided with a flanging flange (101) or external threads; the telescopic sleeve is a hollow straight tubular body, the upper part of the telescopic sleeve is provided with external threads, and an inner cavity with a circular cross section at the upper part is internally provided with an air screen (3); the locking protective sleeve (5) is a hollow sleeve body, the upper part of the locking protective sleeve is provided with a first inner flange (501) with internal threads, and the lower part of the locking protective sleeve is provided with a straight cylindrical central through hole or a stepped cylindrical central through hole with a large upper part and a small lower part; the telescopic pipe forms telescopic threaded connection with the internal thread of the nozzle holder (1) through the external thread on the upper part of the telescopic pipe, and the locking nut (4) or the locking protective sleeve (5) are screwed on the external thread on the upper part of the telescopic pipe and are in locking connection or sealing locking connection with the lower end surface of the nozzle holder (1) and the external thread on the upper part of the telescopic pipe.
2. The retractable nozzle for gas shielded welding capable of ejecting a stable gas flow according to claim 1, wherein: the lower section of the external thread on the upper part of the telescopic sleeve is an intermittent thread, and the internal thread of the locking nut (4) or the locking protective sleeve (5) works on the intermittent thread.
3. The retractable nozzle for gas shielded welding capable of ejecting a stable gas flow according to claim 2, wherein: the outer surface between the sections of the intermittent threads is a smooth arc surface or a platform surface with residual threads, and the smooth arc surface or the platform surface is provided with telescopic adjusting scales of the nozzle.
4. The retractable nozzle for gas shielded welding capable of ejecting a stable gas flow according to claim 3, wherein: when the outer surface between the sections of the interrupted thread is the platform surface, the interrupted thread is arranged into even sections.
5. The retractable nozzle for gas shielded welding capable of ejecting a stable gas flow according to claim 2, wherein: the interrupted thread is provided in 2 or 3 or 4 segments.
6. The retractable nozzle for gas shielded welding capable of ejecting a stable gas flow according to claim 1, wherein: the air screen (3) is fixedly connected with an inner cavity at the upper part of the telescopic sleeve (2) in an interference fit mode.
7. The retractable nozzle for gas shielded welding capable of ejecting a stable gas flow according to claim 2, wherein: the telescopic sleeve is a round funnel-shaped first telescopic sleeve (2), the round cross section of the large inner cavity at the upper part of the telescopic sleeve is larger than that of the small inner cavity at the lower part of the telescopic sleeve, and a contraction type transition section is arranged between the upper part and the lower part of the telescopic sleeve; or the telescopic sleeve is a cylindrical second telescopic sleeve (7), and the upper part (701) of the second telescopic sleeve is provided with a second telescopic sleeveHas external screw thread and inner diameter D of upper port of inner cavity1Greater than the inner diameter D of the lower opening2(ii) a Or the telescopic sleeve is a third telescopic sleeve (8) which is round at the upper part and flat at the lower part, the upper part (801) of the telescopic sleeve is provided with external threads, the lower part (803) of the telescopic sleeve is a flat cylinder body provided with a waist-shaped through hole, and a contraction type transition section (802) is arranged between the upper part and the lower part.
8. The retractable sleeve-shaped nozzle as set forth in claim 7, wherein: when the first telescopic sleeve (2) is matched with the locking protective sleeve (5) with the lower part provided with the cylindrical central through hole with the big upper part and the small lower part, the length of the large hole of the lower part sleeve of the locking protective sleeve (5) is L1Let L be1≥(L3+L4) Wherein L is3The maximum length of the non-meshed thread section in the lower section of the external thread at the upper part of the first telescopic sleeve (2), L4The length of the external contraction transition section between the upper part and the lower part of the first telescopic sleeve (2).
9. The retractable sleeve-shaped nozzle as set forth in claim 7, wherein: when the telescopic sleeve is matched with a locking protective sleeve (5) with a straight cylindrical central through hole at the lower part, the length of the central through hole at the lower part of the locking protective sleeve (5) is not less than the maximum length of the section of the unmeshed thread in the lower section of the external thread at the upper part of the telescopic sleeve.
10. A method of using the retractable nozzle for gas shielded welding capable of ejecting a stable gas flow according to claim 1 or 3, wherein:
1) after a welding torch conducting rod or a welding torch electrode penetrates out of the inner cavity of the nozzle, the welding torch conducting rod or the welding torch electrode is fixedly connected with a welding torch body in a screw connection mode through the flanging flange (101) at the top end of the nozzle seat (1); or when the flanging flange (101) is not arranged at the top end of the nozzle holder (1), the nozzle holder (1) and the welding torch body are quickly fixedly connected in a threaded connection mode through the external threads or the internal threads of the head of the nozzle holder (1);
2) before welding, loosening a locking nut (4) or a locking protective sleeve (5) according to needs, rotating the telescopic sleeve, and measuring the distance from the lower end face of the telescopic sleeve to the surface of a workpiece, namely measuring the height of a nozzle, or observing the telescopic adjusting scale on the outer side of the lower section of the upper part of the telescopic sleeve to realize quantitative telescopic adjustment of the nozzle; during welding, welding protective gas flows in from the upper port of the nozzle and flows out from the lower port of the nozzle, namely flows in from the upper port of the nozzle seat (1) and flows out from the lower port of the telescopic sleeve;
3) when the telescopic sleeve needs to be replaced, after the locking nut (4) or the locking protective sleeve (5) is unscrewed, the telescopic sleeve is directly unscrewed from the lower end of the nozzle seat (1) so as to replace the telescopic sleeve.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111020836.4A CN113681135A (en) | 2021-09-01 | 2021-09-01 | Telescopic nozzle capable of spraying stable airflow for gas shielded welding and use method thereof |
| CN202210300277.0A CN114633006B (en) | 2021-09-01 | 2022-03-24 | Telescopic nozzle capable of spraying stable air flow for gas shielded welding and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111020836.4A CN113681135A (en) | 2021-09-01 | 2021-09-01 | Telescopic nozzle capable of spraying stable airflow for gas shielded welding and use method thereof |
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| CN113681135A true CN113681135A (en) | 2021-11-23 |
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| CN202111020836.4A Pending CN113681135A (en) | 2021-09-01 | 2021-09-01 | Telescopic nozzle capable of spraying stable airflow for gas shielded welding and use method thereof |
| CN202210300277.0A Active CN114633006B (en) | 2021-09-01 | 2022-03-24 | Telescopic nozzle capable of spraying stable air flow for gas shielded welding and use method thereof |
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| CN202210300277.0A Active CN114633006B (en) | 2021-09-01 | 2022-03-24 | Telescopic nozzle capable of spraying stable air flow for gas shielded welding and use method thereof |
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| CN115400904A (en) * | 2022-09-13 | 2022-11-29 | 重庆市渝江机械设备有限公司 | SOx/NOx control spray gun with extending structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB609384A (en) * | 1945-04-19 | 1948-09-30 | Linde Air Prod Co | Blowpipe |
| DE3637060C2 (en) * | 1986-10-31 | 1999-02-04 | Wacker Chemie Gmbh | Device for spraying or injecting liquid into a container and its use |
| CN101823176A (en) * | 2010-01-18 | 2010-09-08 | 上海新亚电焊机有限公司 | Inverter electric welding machine device with adjustable electric arc |
| CN103600160B (en) * | 2013-10-23 | 2015-08-12 | 江苏科技大学 | Narrow gap welding scalable spray nozzle device and control method thereof |
| CN206287367U (en) * | 2016-12-20 | 2017-06-30 | 大连大学 | Rock, concrete cutting machine saw blade diamond segment water-cooling apparatus |
| CN106944725B (en) * | 2017-03-27 | 2019-01-15 | 华南理工大学 | A kind of local dry cavity underwater gas shielded arc welding torch nozzle |
| CN108465902A (en) * | 2018-04-16 | 2018-08-31 | 佛山市南海协隆金属结构有限公司 | A kind of annulus cutting machine |
| CN111390358B (en) * | 2020-04-26 | 2021-07-13 | 江苏科技大学 | Rocking/rotating arc consumable electrode gas shielded welding torch and method of using same |
| CN112222577A (en) * | 2020-09-03 | 2021-01-15 | 江苏科技大学 | Sleeve-shaped flat nozzle device for narrow-gap welding and using method thereof |
| CN113681134B (en) * | 2021-09-01 | 2023-03-31 | 江苏科技大学 | Telescopic sleeve-shaped nozzle for gas shielded welding and method for using same |
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| CN114633006A (en) | 2022-06-17 |
| CN114633006B (en) | 2024-09-03 |
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Application publication date: 20211123 |