阅读说明：本技术 一种双丝焊接机器人工作站 (Double-wire welding robot workstation ) 是由 张书生 朱维金 钟立明 于 2021-09-06 设计创作，主要内容包括：本发明属于焊接技术领域,特别涉及一种双丝焊接机器人工作站。包括焊接机器人及设置于焊接机器人执行末端的双丝焊枪；双丝焊枪包括双丝焊枪本体及安装在双丝焊枪本体一侧的送丝导向装置,其中双丝焊枪本体内设有主焊丝；送丝导向装置内设有辅助焊丝；主焊丝通过接通电源引弧燃烧,形成电弧；辅助焊丝通过主焊丝的电弧灼烧融化。本发明的主焊丝带电,辅助焊丝不带电,不带电焊丝采用弧形通道,解决了现有技术中存在的焊丝与送丝管内壁摩擦力较大,磨损严重的问题。(The invention belongs to the technical field of welding, and particularly relates to a double-wire welding robot workstation. Comprises a welding robot and a double-wire welding gun arranged at the execution tail end of the welding robot; the double-wire welding gun comprises a double-wire welding gun body and a wire feeding guide device arranged on one side of the double-wire welding gun body, wherein a main welding wire is arranged in the double-wire welding gun body; an auxiliary welding wire is arranged in the wire feeding guide device; the main welding wire is ignited and burnt by switching on a power supply to form an electric arc; the auxiliary welding wire is burned and melted by the electric arc of the main welding wire. The main welding wire is electrified, the auxiliary welding wire is not electrified, and the arc-shaped channel is adopted without the welding wire, so that the problems of large friction force between the welding wire and the inner wall of the wire feeding pipe and serious abrasion in the prior art are solved.)

1. A twin-wire welding robot workstation is characterized by comprising a welding robot (1) and a twin-wire welding gun (5) arranged at the execution tail end of the welding robot (1);

the double-wire welding gun (5) comprises a double-wire welding gun body (13) and a wire feeding guide device arranged on one side of the double-wire welding gun body (13), wherein a main welding wire (15) is arranged in the double-wire welding gun body (13); an auxiliary welding wire (17) is arranged in the wire feeding guide device; the main welding wire (15) is ignited and burnt by switching on a power supply to form an electric arc (18);

the auxiliary welding wire (17) is burned and melted by an electric arc (18) of the main welding wire (15).

2. The twin-wire welding robot workstation according to claim 1, characterized in that the wire feed guide comprises a heat-resistant insulator having an arc-shaped configuration and an upper end connected to the twin-wire welding gun body (13); an arc-shaped wire feeding channel is arranged in the heat-resistant insulator, the auxiliary welding wire (17) is arranged in the arc-shaped wire feeding channel, and the end part of the auxiliary welding wire is positioned in the area of an electric arc (18) of the main welding wire (15).

3. The twin wire welding robotic workstation of claim 2, wherein the heat resistant insulator is made of a ceramic material; the double-wire welding gun is characterized in that a double-wire side transition piece (6) is arranged between the heat-resistant insulator and the double-wire welding gun body (13), an auxiliary mounting piece (23) is arranged on the other side of the double-wire welding gun body (13), and the upper end of the heat-resistant insulator is sequentially connected with the double-wire side transition piece (6), the double-wire welding gun body (13) and the auxiliary mounting piece (23) through a connecting screw (22).

4. The twin-wire welding robot workstation according to claim 3, wherein the heat-resistant insulator comprises an inner ceramic sheet, a middle ceramic sheet and an outer ceramic sheet arranged from inside to outside, the number of the middle ceramic sheets is two, and the two middle ceramic sheets are arranged at intervals, and the inner ceramic sheet, the middle ceramic sheet and the outer ceramic sheet enclose the arc wire feeding channel.

5. The twin-wire welding robot workstation according to claim 4, characterized in that the inner ceramic plates comprise an inner ceramic straight plate (7) and an inner ceramic bent plate (8) connected to the lower end of the inner ceramic straight plate (7);

the middle ceramic sheet comprises a middle ceramic straight sheet (9) and a middle ceramic bent sheet (10) connected to the lower end of the middle ceramic straight sheet (9);

the outer ceramic sheet comprises an outer ceramic straight sheet (11) and an outer ceramic bent sheet (12) connected to the lower end of the outer ceramic straight sheet (11);

the inner layer ceramic straight piece (7), the middle layer ceramic straight piece (9) and the outer side ceramic straight piece (11) are connected through the connecting screw (22).

6. Twin-wire welding robot workstation according to claim 1, characterized in that the planes of the main welding wire (15) and the auxiliary welding wire (17) are coplanar with a straight weld seam.

7. Twin-wire welding robot workstation according to claim 1, characterized in that the planes of the main welding wire (15) and the auxiliary welding wire (17) are coplanar with the tangent of a space curve weld.

8. The twin-wire welding robot workstation according to claim 1, characterized in that a straight wire feeding channel is provided in the twin-wire welding gun body (13);

the lower end of the twin-wire welding gun body (13) is provided with a conductive nozzle (14) and a gas guide nozzle (16) from inside to outside, wherein the conductive nozzle (14) is inserted into the direct wire feeding channel, and the gas guide nozzle (16) is in threaded connection with the outer wall of the twin-wire welding gun body (13).

9. The twin-wire welding robot workstation according to claim 8, characterized in that a shielding gas inlet channel (19) is axially arranged in the twin-wire welding gun body (13);

and the conductive nozzle (14) is provided with a gas passing hole (20) along the radial direction, and the gas passing hole is used for communicating a protective gas inlet channel (19) with a nozzle inner cavity (21) of the gas guide nozzle (16).

10. Twin-wire welding robot workstation according to claim 8, characterized in that the upper end of the contact tip (14) is provided with a contact tip threading guide (25).

Technical Field

The invention belongs to the technical field of welding, and particularly relates to a double-wire welding robot workstation.

Background

With the wide application of the gas-electric automatic welding device in the heavy industry, two thin welding wires are often used for welding simultaneously in automatic welding equipment, and a double-wire welding gun is often used for welding simultaneously in order to ensure the welding quality.

The double-wire welding can realize high-speed welding and high-deposition-rate welding, namely, the double-wire welding can play a role in a thin plate mechanism and a thick and large structure product. Compared with the thin single wire welding, the thin double wire automatic welding can greatly improve the productivity, is convenient to change the composition combination of welding wires and adjust the composition of welding seams.

The welding wire is wound in the welding wire disc, when welding, the welding wire is welded through a welding gun through a contact tip by the wire feeding device, the welding wire is mostly a low-carbon steel wire and has higher hardness, the common double-wire welding gun is adopted, the friction force between the welding wire and the inner wall of the wire feeding pipe is larger, the abrasion is serious, the service life of the welding gun is influenced, in addition, the whole welding gun is in rigid connection, the welding wire cannot be compliant with the bending of the welding wire, and the wire feeding is not smooth enough.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a twin-wire welding robot workstation, so as to solve the problems of a complex structure and a large internal wire-moving friction of the existing twin-wire welding gun.

In order to achieve the purpose, the invention adopts the following technical scheme:

the embodiment of the invention provides a double-wire welding robot workstation, which comprises a welding robot and a double-wire welding gun arranged at the execution tail end of the welding robot;

the double-wire welding gun comprises a double-wire welding gun body and a wire feeding guide device arranged on one side of the double-wire welding gun body, wherein a main welding wire is arranged in the double-wire welding gun body; an auxiliary welding wire is arranged in the wire feeding guide device; the main welding wire is ignited and burnt by switching on a power supply to form an electric arc;

and the auxiliary welding wire is burned and melted by the electric arc of the main welding wire.

In one possible implementation manner, the wire feeding guide device comprises a heat-resistant insulator, the heat-resistant insulator is of an arc-shaped structure, and the upper end of the heat-resistant insulator is connected with the double-wire welding gun body; an arc-shaped wire feeding channel is arranged in the heat-resistant insulator, the auxiliary welding wire is arranged in the arc-shaped wire feeding channel, and the end part of the auxiliary welding wire is positioned in the area of the electric arc of the main welding wire.

In one possible implementation, the heat-resistant insulator is made of a ceramic material; the double-wire welding gun comprises a heat-resistant insulator, a double-wire welding gun body and an auxiliary mounting piece, wherein a double-wire side transition piece is arranged between the heat-resistant insulator and the double-wire welding gun body, the auxiliary mounting piece is arranged on the other side of the double-wire welding gun body, and the upper end of the heat-resistant insulator is connected with the double-wire side transition piece, the double-wire welding gun body and the auxiliary mounting piece in sequence through connecting screws.

In a possible implementation manner, the heat-resistant insulator comprises an inner-layer ceramic piece, a middle-layer ceramic piece and an outer-layer ceramic piece which are arranged from inside to outside, the number of the middle-layer ceramic pieces is two, the middle-layer ceramic pieces are arranged at intervals, and the inner-layer ceramic piece, the middle-layer ceramic piece and the outer-layer ceramic pieces enclose the arc wire feeding channel.

In one possible implementation manner, the inner ceramic sheet comprises an inner ceramic straight sheet and an inner ceramic bent sheet connected to the lower end of the inner ceramic straight sheet;

the middle ceramic sheet comprises a middle ceramic straight sheet and a middle ceramic bent sheet connected to the lower end of the middle ceramic straight sheet;

the outer ceramic sheet comprises an outer ceramic straight sheet and an outer ceramic bent sheet connected to the lower end of the outer ceramic straight sheet;

the inner layer ceramic straight piece, the middle layer ceramic straight piece and the outer side ceramic straight piece are connected through the connecting screw.

In one possible implementation, the planes of the main welding wire and the auxiliary welding wire are coplanar with the straight welding seam.

In one possible implementation, the planes of the main welding wire and the auxiliary welding wire are coplanar with the tangent of the space curve welding seam.

In one possible implementation manner, a straight wire feeding channel is arranged in the double-wire welding gun body;

the lower end of the twin-wire welding gun body is provided with a conductive nozzle and a gas guide nozzle from inside to outside, wherein the conductive nozzle is inserted into the direct wire feeding channel, and the gas guide nozzle is in threaded connection with the outer wall of the twin-wire welding gun body.

In one possible implementation manner, a shielding gas inlet channel is arranged in the double-wire welding gun body along the axial direction;

and the conductive nozzle is radially provided with a gas passing hole on the conductive nozzle for communicating the protective gas inlet channel with the nozzle inner cavity of the gas guide nozzle.

In a possible realization mode, the upper end of the contact tube is provided with a contact tube wire-penetrating guide.

The invention has the advantages and beneficial effects that: according to the double-wire welding robot workstation provided by the invention, the main welding wire is electrified, the auxiliary welding wire is not electrified, and an arc-shaped channel is adopted without the welding wire, so that the problems of large friction force and serious abrasion between the welding wire and the inner wall of the wire feeding pipe in the prior art are solved;

in the invention, the uncharged welding wire is adopted to stir the molten pool, which is beneficial to the quality of welding seams; the uncharged welding wire can also carry out pulsed wire feeding to form fish scale patterns, which is beneficial to weld forming; the uncharged welding wire reduces heat input and improves deposition rate.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of a twin-wire welding robot workstation according to the present invention;

FIG. 2 is an isometric view of a twin wire torch of the present invention;

FIG. 3 is a cross-sectional view of a twin wire torch of the present invention;

FIG. 4 is a schematic structural view of a twin-wire torch body according to the present invention;

FIG. 5 is a schematic view of a wire guide assembly according to the present invention;

in the figure: 1. welding robot, 2, bottom plate, 3, riser, 4, fillet weld, 5, double-wire welding gun, 6, double-wire side transition piece, 7, inner layer ceramic straight piece, 8, inner layer ceramic bent piece, 9, middle layer ceramic straight piece, 10, middle layer ceramic bent piece, 11, outer side ceramic straight piece, 12, outer layer ceramic bent piece, 13, double-wire welding gun body, 14, contact tip, 15, main welding wire, 16, gas guide nozzle, 17, auxiliary welding wire, 18, electric arc, 19, protective gas inlet channel, 20, gas passing hole on the contact tip, 21, nozzle inner cavity, 22, connecting screw, 23, auxiliary mounting part, 24, auxiliary welding wire threading guide, 25, contact tip threading guide.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

According to the double-wire welding robot workstation provided by the embodiment of the invention, the uncharged welding wire is adopted to stir the molten pool, so that the welding seam quality is facilitated; the arc-shaped channel is adopted without the welding wire, so that the problems of large friction force and serious abrasion between the welding wire and the inner wall of the wire feeding pipe in the prior art are solved. Referring to fig. 1-3, the twin-wire welding robot workstation comprises a welding robot 1 and a twin-wire welding gun 5 arranged at the executing end of the welding robot 1; the double-wire welding gun 5 comprises a double-wire welding gun body 13 and a wire feeding guide device arranged on one side of the double-wire welding gun body 13, wherein a main welding wire 15 is arranged in the double-wire welding gun body 13; an auxiliary welding wire 17 is arranged in the wire feeding guide device; the main welding wire 15 is ignited and burnt by switching on the power supply to form an electric arc 18; the auxiliary wire 17 is burned and melted by the arc 18 of the main wire 15.

Referring to fig. 3, in the embodiment of the present invention, a straight wire feeding channel is provided in the twin-wire welding gun body 13; the lower end of the twin-wire welding gun body 13 is provided with a conductive nozzle 14 and a gas guide nozzle 16 from inside to outside, wherein the conductive nozzle 14 is inserted into the direct wire feeding channel, and the gas guide nozzle 16 is in threaded connection with the outer wall of the twin-wire welding gun body 13.

Further, as shown in fig. 4, a shielding gas inlet channel 19 is axially arranged in the twin-wire welding gun body 13; the contact tube 14 is provided with a nozzle gas passing hole 20 along the radial direction for communicating the shield gas inlet channel 19 with the nozzle cavity 21 of the gas nozzle 16. The shielding gas passes through the shielding gas inlet channel 19, the gas passing hole 20 on the contact tube and the nozzle inner cavity 21 in sequence, and is sprayed to cover the welding area of the electric arc and the welding operation.

Further, the contact tip 14 is provided at an upper end thereof with a contact tip threading guide 25.

Referring to fig. 3, in the embodiment of the present invention, the wire feeding guide device includes a heat-resistant insulator, which is an arc-shaped structure, and the upper end of the heat-resistant insulator is connected to the twin-wire welding gun body 13; an arc-shaped wire feeding channel is arranged in the heat-resistant insulator, an auxiliary welding wire 17 is arranged in the arc-shaped wire feeding channel, and the end part of the auxiliary welding wire 17 is positioned in the area of an electric arc 18 of the main welding wire 15.

In the embodiment of the invention, the heat-resistant insulator is made of ceramic material; referring to fig. 2, a double-wire side transition piece 6 is arranged between the heat-resistant insulator and the double-wire welding gun body 13, an auxiliary mounting piece 23 is arranged on the other side of the double-wire welding gun body 13, and the upper end of the heat-resistant insulator is sequentially connected with the double-wire side transition piece 6, the double-wire welding gun body 13 and the auxiliary mounting piece 23 through a connecting screw 22.

Referring to fig. 2, in the embodiment of the invention, the heat-resistant insulator comprises an inner ceramic sheet, a middle ceramic sheet and an outer ceramic sheet which are arranged from inside to outside, the number of the middle ceramic sheets is two, the middle ceramic sheets are arranged at intervals, and the inner ceramic sheet, the middle ceramic sheet and the outer ceramic sheet enclose a synthesized arc wire feeding channel. The arc-shaped wire feed channel controls the auxiliary welding wire 17 in the working plane formed by the main welding wire 15 and the weld seam tangentially.

Referring to fig. 3 and 5, in the embodiment of the present invention, the inner ceramic sheet includes an inner ceramic straight sheet 7 and an inner ceramic bent sheet 8 connected to a lower end of the inner ceramic straight sheet 7; the middle ceramic sheet comprises a middle ceramic straight sheet 9 and a middle ceramic bent sheet 10 connected with the lower end of the middle ceramic straight sheet 9; the outer ceramic sheet comprises an outer ceramic straight sheet 11 and an outer ceramic bent sheet 12 connected to the lower end of the outer ceramic straight sheet 11; the inner layer ceramic straight piece 7, the middle layer ceramic straight piece 9 and the outer side ceramic straight piece 11 are connected through a connecting screw 22. Specifically, the connecting screw 22 sequentially penetrates through the outer ceramic straight piece 11, the middle ceramic straight piece 9, the inner ceramic straight piece 7, the air guide nozzle 16 and the twin-wire welding gun body 13 and then is in threaded connection with the auxiliary mounting piece 23.

Furthermore, the inner sides of the upper ends of the inner layer ceramic straight piece 7, the middle layer ceramic straight piece 9 and the outer side ceramic straight piece 11 are provided with auxiliary welding wire threading guides 24 for assisting the guiding of the welding wires 17.

Preferably, for a long straight weld, the plane in which the primary and secondary welding wires 15, 17 lie is coplanar with the straight weld. However, for a non-linear weld, the weld path is a space curve, for example, a saddle line for welding two cylindrical pipes with different diameters, and the planes of the main welding wire 15 and the auxiliary welding wire 17 are coplanar with the tangent line of the space curve weld.

In the embodiment of the invention, one end of the double-wire welding gun body 13 is connected to the robot body, and the other end of the double-wire welding gun body 13 is connected with the contact tip 14. The main welding wire 15 is guided by a contact tip threading guide 25 and passes through the contact tip 14 to form a mechanical radial fixing and welding circuit communication relationship. The wire feeding guide device is used for guiding in an inward bending mode, so that the auxiliary welding wire 17 is positioned in an operation plane formed by the main welding wire 15 and the welding line in a tangential direction, and the auxiliary welding wire 17 is subjected to arc burning and melting between the main welding wire 15 and the workpiece bottom plate and the vertical plate. The tail end of the auxiliary welding wire 17 is a space arc which can stir a molten pool and is beneficial to the quality of welding seams. The auxiliary welding wire 17 can also send wires in a pulsating mode to form fish scale patterns, and welding seam forming is facilitated. The pulse wire feeding control method is to periodically change the wire feeding speed by a special wire feeding mechanism to realize the control of the molten drop transition. The pulsating wire feed speed varies sinusoidally, thereby determining the shape of the droplet and the speed of the transition. The movement speed of the initial molten drop is slow, and an inertia force pointing to the welding wire acts on the molten drop, so that the molten drop is flattened; when the wire feeding speed reaches the maximum value, the wire feeding speed is gradually reduced, and the molten drop still continues to move forwards in an accelerated manner under the action of the inertia force, so that the molten drop forms a necking due to elongation, is then pulled off from the welding wire and is transited to a molten pool. Because the inertia force of the pulse wire feeding promotes the droplet transition, the minimum current of the pulse wire feeding welding is about 10 to 20 percent smaller than the average current of the electric control pulse welding. The pulse wire feeding welding can realize the short-circuit-free welding when the arc voltage is higher; short circuit transition can be realized when the arc voltage is low, and if welding parameters are appropriate, the short circuit process is very regular, splashing is small, and the welding process is stable.

In the embodiment of the invention, the auxiliary welding wire 17 is not electrified, can stir a molten pool, and is beneficial to the quality of welding seams. The auxiliary welding wire 17 can also send wires in a pulsating mode to form fish scale patterns, and welding seam forming is facilitated. The auxiliary welding wire 17 is uncharged, so that heat input is reduced, and deposition rate is improved

The wire feeding guide device is externally arranged on the main body of the double-wire welding gun, and the wire feeding guide device has the advantages of low cost and convenience in maintenance. Meanwhile, the auxiliary welding wires are guided into arc lines by the heat-resistant insulating part and are obliquely inserted into the electric arc between the welding wires and the molten pool, and the curve is obliquely crossed, so that the problem that the shielding gas structure, the guide structure, the insulating mechanism and the heat-resistant structure are difficult to arrange due to the fact that the two welding wire auxiliary structures are too close is solved. Meanwhile, the welding space is limited, and the interference and collision of the bottom plate and the vertical plate with the movement of the welding gun structure are avoided.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.