阅读说明：本技术 一种高熔敷速率气保焊接嘴 (High-deposition-rate gas shield welding nozzle ) 是由 万升云 葛佳棋 钟奎 汤旭祥 郑小康 章文显 卢永建 沈芸 于 2021-08-31 设计创作，主要内容包括：本发明涉及一种高熔敷速率气保焊接嘴,属于焊接技术领域。该气保焊接嘴由喷嘴、焊丝导管、多齿焊丝夹座、多齿焊丝夹、分流器组成；组装时,焊丝导管的导管体以管肩限位于喷嘴内筒前端面的方式穿装于喷嘴的中央焊丝导管孔；多齿焊丝夹以弹性夹齿外侧抵靠于多齿焊丝夹座锥形腔内壁的方式嵌入中心通孔；分流器的外螺纹与喷嘴的内筒螺纹旋合,通过压持多齿焊丝夹,使多齿焊丝夹座的前端抵靠于喷嘴的管肩上。采用本发明,有效保证了焊丝的电接触点位置,增加了焊丝导管的耐磨性,防止焊丝导管内径磨损；并且可有效补偿磨损,提高了焊丝通电点的高度,增加焊丝的预热长度,提升焊丝的熔敷速率。(The invention relates to a gas shield welding nozzle with a high deposition rate, and belongs to the technical field of welding. The gas shield welding nozzle consists of a nozzle, a welding wire guide pipe, a multi-tooth welding wire holder, a multi-tooth welding wire clamp and a shunt; during assembly, the guide pipe body of the welding wire guide pipe is arranged in the central welding wire guide pipe hole of the nozzle in a penetrating way in which the pipe shoulder is limited on the front end surface of the nozzle inner cylinder; the multi-tooth welding wire clamp is embedded into the central through hole in a mode that the outer side of the elastic clamp tooth abuts against the inner wall of the conical cavity of the multi-tooth welding wire clamp seat; the external thread of the shunt is screwed with the internal cylinder thread of the nozzle, and the front end of the multi-tooth welding wire clamp seat is abutted against the pipe shoulder of the nozzle by pressing and holding the multi-tooth welding wire clamp. By adopting the invention, the position of the electric contact point of the welding wire is effectively ensured, the wear resistance of the welding wire conduit is increased, and the inner diameter of the welding wire conduit is prevented from being worn; and can effectively compensate wearing and tearing, improve the height of welding wire circular telegram point, increase the preheating length of welding wire, promote the speed of depositing of welding wire.)

1. A high deposition rate gas shield welding tip, its characterized in that: the welding wire clamp is composed of a nozzle (1), a welding wire guide pipe (2), a multi-tooth welding wire clamp seat (3), a multi-tooth welding wire clamp (4) and a shunt (5);

a nozzle inner cylinder (13) with the front end surface positioned in the nozzle outer cylinder is fixed in an inner hole at the rear end of a tubular nozzle outer cylinder (11) of the nozzle through an insulating cylinder (12); the inner hole of the nozzle inner cylinder is provided with inner cylinder threads (133), and the front end surface is provided with a welding wire guide hole (131) and exhaust holes (132) distributed around the welding wire guide hole;

the welding wire conduit is composed of a conduit body (21) inserted and fixed with a heat insulation (22), and the rear end of the conductor pipe is provided with a pipe shoulder (211) formed by expanding;

the multi-tooth welding wire clamping seat is provided with a central through hole formed by a rear end conical cavity (32) and a front end through cavity (33), and through air holes (31) are formed in the periphery of the conical cavity (32) in a surrounding mode;

the multi-tooth welding wire clamp is composed of a group of elastic clamp teeth (41) which extend along the axial direction of the ring and are radially shrunk to form a central welding wire hole (42);

the cylindrical main body of the flow divider is provided with a front-end external thread (53) and a rear-end internal thread (54), the internal thread hole is communicated with a welding wire through hole (51) at the front end through a reducing taper hole, and inclined vent holes (52) are distributed in the circumferential direction of the reducing taper hole;

during assembly, a guide pipe body (21) of the welding wire guide pipe is arranged in a central welding wire guide pipe hole (131) of the nozzle in a penetrating way in such a way that a pipe shoulder (211) is limited on the front end surface of the nozzle inner cylinder; the multi-tooth welding wire clamp is embedded into the central through hole in a mode that the outer side of each elastic clamp tooth (41) abuts against the inner wall of the conical cavity (32) of the multi-tooth welding wire clamp seat; and the external thread (53) of the flow divider is screwed with the internal cylinder thread (133) of the nozzle, and the front end of the multi-tooth welding wire holder (3) is abutted against the pipe shoulder of the nozzle by pressing and holding the multi-tooth welding wire holder.

2. The high deposition rate gas shield welding tip of claim 1, wherein: the upper edge formed after the ring is unfolded downwards extends by a gradually-reduced curve section, at least three elastic clamping teeth with equal intervals extend by a straight section, and the upper edge is bent to form a regular polygon ring.

3. The high deposition rate gas shield welding tip of claim 2, wherein: the at least three elastic clamping teeth gradually and radially shrink in a tapered curve section and then form a welding wire hole in a straight line section.

4. A high deposition rate gas shield welding tip as defined in claim 3, wherein: the lower end of the wire hole is expanded outwards.

5. The high deposition rate gas shield welding tip of claim 4, wherein: the upper end surface of the through air hole is lower than the upper end surface of the conical cavity.

6. The high deposition rate gas shield welding tip as recited in any of claims 1 to 5, further comprising: the inner diameter of the heat insulation pipe is 0.3-1 mm larger than the diameter of the welding wire.

Technical Field

The invention relates to a welding nozzle for gas metal arc welding, in particular to a gas metal arc welding nozzle with high deposition rate, belonging to the technical field of welding.

Background

In the gas metal arc welding process, electric arcs are generated between continuously fed welding wires and workpieces to be welded, the front ends of the welding wires are melted to form molten drops and are transited to a molten pool, and the molten pool is cooled and solidified to form welding seams. In a conventional gas shielded welding nozzle structure, a component for guiding and delivering a welding wire and transmitting current to the welding wire is a contact nozzle, which is generally of a hollow structure and is made of brass, red copper or chromium zirconium copper material. For smooth guiding of the welding wire, the inner diameter of the contact tip is usually slightly larger than the wire diameter of the welding wire, and when the welding wire passes through the contact tip, a contact point is often unfixed, which easily causes instability of an electric arc in a welding process. In addition, the friction between the welding wire and the contact tip in the guiding process of the welding wire can cause the inner wall of the contact tip to be abraded, the inner diameter is enlarged, and the phenomena of poor contact between the contact tip and the welding wire, unstable electric arc and splashing are further aggravated.

Chinese patent publication No. CN 112264693 a, entitled "a contact tube assembly", discloses a contact tube assembly, comprising: conductive nozzle, conductive nozzle seat, sleeve and round pin axle. The one end joint of conductive nozzle is inside the sleeve, sleeve and conductive nozzle seat detachably fixed connection, the one end and the conductive nozzle seat butt of conductive nozzle, the one end of conductive nozzle is for the rotatable regulation of sleeve. When one side of the contact tube is worn to the limit, the contact tube is rotated for a certain angle relative to the sleeve and the contact tube, and the unworn position of the contact tube is rotated to the worn position, so that the contact tube can be continuously used, the consumption of the contact tube is greatly reduced, and a large amount of material resources wasted by repeatedly replacing the contact tube are saved. However, because the welding wire used in gas shield welding has a certain warping distance and a loose diameter, the contact position with the contact tip is changed during welding, and rotating the unworn position of the contact tip to the worn position cannot ensure that the contact point between the welding wire and the contact tip is still stable at the same position, so that the worn part of the contact tip has the possibility of continuous wear, and the purpose of reducing the frequency of replacing the contact tip cannot be actually achieved.

Disclosure of Invention

The invention aims to: aiming at the defects in the prior art, the gas shield welding nozzle with the high deposition rate is provided through structural improvement, the problem that electric arcs are unstable due to the fact that the contact point of a welding contact nozzle (welding nozzle for short) and a welding wire is not fixed is properly solved, the deposition rate of the welding wire can be improved, and therefore the welding efficiency of gas shield welding is improved on the premise that the welding quality is guaranteed.

In order to achieve the purposes, the basic technical scheme of the high-deposition-rate gas-shielded welding nozzle comprises the following steps: the welding wire clamp comprises a nozzle, a welding wire guide pipe, a multi-tooth welding wire clamp seat, a multi-tooth welding wire clamp and a shunt;

the inner hole at the rear end of the tubular nozzle outer cylinder of the nozzle is internally fixed with a nozzle inner cylinder of which the front end surface is positioned in the nozzle outer cylinder through an insulating cylinder; the inner hole of the nozzle inner cylinder is provided with inner cylinder threads, and the front end surface is provided with a welding wire guide hole and exhaust holes distributed around the welding wire guide hole;

the welding wire conduit is formed by inserting and fixing a heat-insulating conduit body, and the rear end of the conductor pipe is provided with a pipe shoulder formed by expanding;

the multi-tooth welding wire holder is provided with a central through hole formed by a rear end conical cavity and a front end through cavity, and through air holes are circumferentially surrounded outside the conical cavity;

the multi-tooth welding wire clamp is composed of a group of elastic clamp teeth which extend along the axial direction of the ring and are radially shrunk to form a central welding wire hole;

the cylindrical main body of the flow divider is provided with a front-end external thread and a rear-end internal thread, an internal thread hole is communicated with a welding wire through hole at the front end through a reducing taper hole, and inclined vent holes are distributed in the circumferential direction of the reducing taper hole;

during assembly, the guide pipe body of the welding wire guide pipe is arranged in the central welding wire guide pipe hole of the nozzle in a penetrating way in which the pipe shoulder is limited on the front end surface of the nozzle inner cylinder; the multi-tooth welding wire clamp is embedded into the central through hole in a mode that the outer side of each elastic clamping tooth abuts against the inner wall of the conical cavity of the multi-tooth welding wire clamp seat; the external thread of the flow divider is screwed with the internal cylinder thread of the nozzle, and the front end of the multi-tooth welding wire clamp seat is pressed against the pipe shoulder of the nozzle by pressing the multi-tooth welding wire clamp.

By adopting the invention, the single material and the hollow structure of the traditional gas shield welding contact nozzle are changed, the electrical contact point of the welding wire is fixed by the multi-tooth welding wire clamp for conducting, the welding wire guide pipe is insulated by adopting the ceramic pipe, and the welding wire is in no electrical contact with the welding wire guide pipe; and because the multi-tooth welding wire clamp is arranged in the welding gun nozzle, the multi-tooth welding wire clamp can keep good contact with a welding wire by utilizing the elasticity between the multi-tooth welding wire clamp, and after the multi-tooth welding wire clamp is abraded, the pressing force of the elastic clamp teeth is adjusted, so that the abrasion can be effectively compensated. In addition, through the contact of multiple tooth welding wire presss from both sides and the welding wire, improved the height of welding wire circular telegram point, increase the preheating length of welding wire, promote the deposition rate of welding wire. Therefore, compared with the prior art, the method has remarkable substantive features and outstanding progress.

The invention has the further perfection that: the upper edge formed after the ring is unfolded downwards extends by a gradually-reduced curve section, at least three elastic clamping teeth with equal intervals extend by a straight section, and the upper edge is bent to form a regular polygon ring.

The invention has the further perfection that: the at least three elastic clamping teeth gradually and radially shrink in a tapered curve section and then form a welding wire hole in a straight line section.

The invention has the further improvement that: the lower end of the wire hole is expanded outwards.

The invention has the further perfection that: the upper end surface of the through air hole is lower than the upper end surface of the conical cavity.

The invention has the further perfection that: the inner diameter of the heat insulation pipe is 0.3-1 mm larger than the diameter of the welding wire.

Drawings

The present invention will be described in further detail with reference to the following examples, which are given in conjunction with the accompanying drawings.

Fig. 1(a) is a schematic structural diagram of an embodiment of the present invention.

FIG. 1(b) is a schematic structural view of the nozzle in the embodiment of FIG. 1.

FIG. 2(a) is a schematic diagram of the nozzle inner barrel structure of the embodiment of FIG. 1.

Fig. 2(b) is a plan view of fig. 2 (a).

FIG. 3(a) is a schematic view of the wire guide configuration of the embodiment of FIG. 1.

Fig. 3(b) is a plan view of fig. 3 (a).

FIG. 4(a) is a schematic view of the multi-tooth wire holder of the embodiment of FIG. 1.

Fig. 4(b) is a plan view of fig. 4 (a).

FIG. 5(a) is a schematic view of the multiple tooth wire clamp expanded configuration of the embodiment of FIG. 1.

Fig. 5(b) is a side view of fig. 5 (a).

FIG. 5(c) is a schematic view of a multi-tooth wire clamp configuration of the embodiment of FIG. 1.

Fig. 5(d) is a plan view of fig. 5 (c).

Fig. 6(a) is a schematic view of the diverter structure of the embodiment of fig. 1.

Fig. 6(b) is a plan view of fig. 6 (a).

Detailed Description

Example one

The high deposition rate gas shield welding nozzle of the present example is composed of a nozzle 1, a wire guide 2, a multi-tooth wire holder 3, a multi-tooth wire holder 4, and a flow divider 5, as shown in fig. 1 (a).

As shown in fig. 1(b), 2(a) and 2(b), the nozzle 1 includes a tubular nozzle outer cylinder 11 having a tapered tip with a reduced diameter, a ceramic insulating cylinder 12 tightly fitted and fixed to an inner hole of a rear end of the nozzle outer cylinder 11, and a nozzle inner cylinder 13 tightly fitted and fixed to an inner hole of the ceramic insulating cylinder 12. The inner bore of the nozzle inner cylinder 13 has inner cylinder threads 133 and its front end face reaches the middle of the nozzle outer cylinder 11, with a central wire guide bore 131 and eight exhaust holes 132 evenly distributed around the wire guide bore.

As shown in fig. 3(a) and 3(b), the wire guide 2 is composed of a copper guide body 21 to which a heat insulating ceramic tube 22 is inserted and fixed, and the rear end of the conductor tube 21 has a tube shoulder 211 formed by expanding a diameter. In order to ensure that the welding wire passes through smoothly and the electric arc is stable in the welding process, the inner diameter of the ceramic tube 22 is 0.3-1 mm larger than the diameter of the welding wire.

As shown in fig. 4(a) and 4(b), the multi-tooth wire holder 3 has a central through hole formed by a tapered cavity 32 and a through cavity 33 communicating with each other, the tapered cavity 32 has an inclination angle of 30 °, and six through holes 31 are circumferentially surrounded. The upper end surface of the through air hole 31 is lower than the upper end surface of the conical cavity 32.

As shown in fig. 5(a) to 5(d), the multi-tooth wire clip 4 is made of a cemented carbide copper material and is composed of six elastic clip teeth 41 extending in the axial direction of the ring and radially shrinking to form a central wire hole 42. And (b) unfolding as shown in fig. 5(a), preparing by a wire cutting or stamping process, extending the upper edge of the wire hole by a tapered curve section 4.1 downwards, extending six equally-spaced elastic clamping teeth 41 by a straight line section 4.2, making the upper edge into a regular hexagon ring by a bending process, gradually and radially shrinking the six elastic clamping teeth 41 by the tapered curve section 4.1, forming a wire hole 42 by the straight line section 4.2, and expanding the lower end of the wire hole 42 outwards. The size of the welding wire hole 42 can be changed by adjusting the shrinkage degree of the elastic clamping teeth 41 so as to adapt to different wire diameters of welding wires.

As shown in fig. 6(a) and 6(b), the flow divider 5 has a cylindrical main body having a front end external thread 53 and a rear end internal thread 54 connected to a welding torch, and the internal thread hole communicates with a welding wire through hole 51 at the front end via a reduced taper hole having six oblique vent holes 52 uniformly distributed in the circumferential direction.

After assembly, as shown in fig. 1a, the guide tube body 21 of the welding wire guide tube is inserted into the central welding wire guide tube hole 131 of the nozzle in a mode that the tube shoulder 211 is limited on the front end surface of the nozzle inner cylinder; the multi-tooth welding wire clamp is embedded into the central through hole in a mode that the outer side of the elastic clamp tooth 41 abuts against the inner wall of the multi-tooth welding wire clamp seat conical cavity 32; the external thread 53 of the splitter is screwed with the internal cylinder thread 133 of the nozzle, and the front end of the multi-tooth welding wire holder 3 is abutted against the pipe shoulder of the nozzle by pressing and holding the multi-tooth welding wire holder.

When welding is carried out, a welding wire passes through the welding wire through hole 51, enters the multi-tooth welding wire clamp 4, passes through the welding wire hole 42, enters the ceramic tube 22 and finally passes out of the nozzle 1; after entering the splitter 5, the shielding gas enters the nozzle inner cylinder 13 through the welding wire through hole 51 and the inclined vent hole 52, and is discharged through the vent hole 132 after passing through the straight vent hole 31, the conical cavity 32 and the straight cavity 33, so that the arc is protected; the teeth 41 of the multi-tooth welding wire clamp 4 clamp the welding wire, the conductive point of the welding wire is fixed under the condition of not reducing the conductivity, the ceramic tube 22 in the welding wire guide tube 2 can effectively increase the wear resistance of the welding wire guide tube 2, the welding wire is well guided, the splashing caused by unstable wire feeding is avoided, the ceramic tube 22 insulates the welding wire from the guide tube copper tube 21, the welding wire is prevented from generating a conductive point in the welding wire guide tube 2 again, the fixation of the conductive point of the welding wire plays a role in stabilizing electric arc, therefore, in welding using the present invention, the conductive point of the wire is fixed at the wire hole 42 formed by the tooth 41, no conductive point is arranged at other positions of the welding wire, and the position of the conductive point is higher than that of the conductive point when the welding wire is welded by using a traditional welding nozzle, therefore, when the welding is performed by using the embodiment, the dry elongation of the welding wire is lengthened, the resistance heat of the welding wire is increased, and the deposition rate of the welding wire is further improved.

Experiments show that the arc welding device can enable the arc to be more stable in the welding process, reduce consumption of welding contact tips, improve welding efficiency and integrally reduce welding cost.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.