CN107775159B

CN107775159B - Welding machine

Info

Publication number: CN107775159B
Application number: CN201610730492.9A
Authority: CN
Inventors: 王文乐; 袁光伟; 张仁堂; 王冬平; 王林森
Original assignee: Beijing Wenyuantongchuang S & T Ltd; Dongfang Boiler Group Co Ltd
Current assignee: Beijing Wenyuantongchuang S & T Ltd; Dongfang Boiler Group Co Ltd
Priority date: 2016-08-25
Filing date: 2016-08-25
Publication date: 2024-06-07
Anticipated expiration: 2036-08-25
Also published as: WO2018036534A1; RU2709918C1; CN107775159A

Abstract

The application discloses a welding machine, which comprises a machine body (4), a motor, a transmission mechanism (8) and a U-shaped revolving body (7), wherein the motor drives the U-shaped revolving body to revolve clockwise and anticlockwise through the transmission mechanism (8), the machine body (4) is provided with a U-shaped opening, a U-shaped cable guide piece (9) is arranged on the U-shaped revolving body (7), a welding gun bracket (11) is arranged on the U-shaped cable guide piece (9), a welding gun head (10) is arranged on the welding gun bracket (11), the welding gun head (10) is connected with a cable (2), one side of the U-shaped cable guide piece (9) is hinged with a bridge passing plate (16), and the bridge passing plate (16) can rotate to seal the opening of the U-shaped cable guide piece. The welding machine is not limited by the length and the shape of the small tube seat, realizes the automatic welding, is flexible and easy to operate, and improves the welding quality and efficiency.

Description

Welding machine

Technical Field

The application relates to the field of welding, in particular to a welding machine.

Background

The welding of the external corner weld of the small tube seat has extremely high universality in actual production, such as industries of boilers, pressure vessels, petrochemical industry, shipbuilding and the like, and other industrial fields.

For welding dense small tube seat workpieces with smaller pitches and long tube seats with longer lengths or bends at the top, such as long tube seats on a boiler header, the realization of automatic small tube seat welding has been a difficult problem. With the continuous improvement of the parameters of boiler products, the grade of materials for the boiler header is also improved, and for high-parameter boilers, 12Cr1MoVG and above materials become the main materials for header products. The currently applied welding materials are mainly flux-cored wires with the diameter of 1.2mm, and the flux-cored wires have large wire feeding resistance and poor welding stability due to the poor rigidity; meanwhile, most of header products mainly adopt long pipe seat structures, the welding operation space is small, and the accessibility is poor. The welding difficulty is increased due to the base material grade and the complexity of the welding structure, and high requirements are set for the welding quality. At present, the fillet welds of the small tube seats in the domestic boiler industry are all welded manually, the welding workload is large, the labor intensity is high, the welding quality is greatly influenced by human factors, the quality is not easy to guarantee, and the production efficiency is low.

The Chinese patent ZL200410025592.9 discloses an automatic welding process and device for a long tube joint of a boiler header, and relates to a non-wire filling argon arc welding (TIG) welding process for the long tube joint of the boiler header, wherein the device is formed by reforming a tube welding machine mature in the market, and comprises a rotating mechanism, a motor and the like, but is only suitable for backing welding (self-fluxing) the long tube seat joint from the outside because the filling of welding wires cannot be realized, and can not finish the welding of external corner welding seams.

In addition, chinese patent ZL201220432549.4 discloses an improved automatic submerged arc welding device for fillet weld of header nipple joints, which uses a manner of inserting the center of the pipe to perform positioning, so that only the header base can be welded, and the long header base with the elbow at the top can not be welded.

Therefore, there is a need in the boiler industry for header tube socket welding and other industries with similar manufacturing processes for an apparatus that can achieve automated welding of small tube socket external corner welds to greatly improve automation, production efficiency and product manufacturing quality.

Disclosure of Invention

The application aims to provide a welding machine which is used for realizing continuous wire feeding when a welding gun cable is wound around a pipe by a circle (more than or equal to 400 degrees), and solves the problem of welding of the external corner weld joints of a dense long pipe seat and a long pipe seat with an elbow at the top. The application also aims to provide a welding machine which is convenient and quick to position, flexible, simple and convenient to operate and low in requirements on machining and assembly accuracy of the small tube seat groove.

The welding machine comprises a machine body, a motor, a transmission mechanism and a U-shaped revolving body, wherein the motor drives the U-shaped revolving body to revolve clockwise and anticlockwise through the transmission mechanism, the machine body is provided with a U-shaped opening, a U-shaped cable guide piece is arranged on the U-shaped revolving body, a welding gun support is arranged on the U-shaped cable guide piece, a welding gun head is arranged on the welding gun support, the welding gun head is connected with a cable, a bridge passing plate is hinged to one side of the U-shaped cable guide piece, and the bridge passing plate can rotate to seal the opening of the U-shaped cable guide piece.

According to an aspect of the welding machine of the present application, the welding gun carriage is provided on the U-shaped cable guide so as to be movable up and down.

According to an aspect of the welding machine of the present application, the welding machine further includes a plurality of legs, and the legs are respectively disposed on the machine body.

According to an aspect of the welding machine, the welding machine further comprises a center positioning die, wherein the center positioning die is arranged at the bottom side of the U-shaped opening of the machine body, and a replaceable positioning pin is arranged on the center positioning die.

According to an aspect of the welding machine of the present application, the welding machine further includes a pair of elastic clamping plates disposed at both sides of the inside of the U-shaped opening of the body.

According to an aspect of the welding machine of the present application, the welding machine further comprises a cable inlet bracket provided on the machine body, through which a cable of the welding gun passes.

According to an aspect of the welding machine of the present application, the welding machine further comprises a spring, one end of the spring is fixed on the cable inlet support, and the other end of the spring is fixed on the cable.

The welding machine can be used for automatically welding the external corner weld of the small tube seat, overcomes the limitation of the prior art, achieves the diversity of welding technology and the universality of application fields, and has the following main beneficial effects and advantages:

1) The welding gun cable can be wound on the U-shaped cable guide piece for more than or equal to 400 degrees, so that the welding wire (contained in the cable) (particularly the flux-cored wire) is conveyed under the conditions of the circumference of R50mm and the winding for more than or equal to 400 degrees, and the problem of welding the dense long pipe seat and the outer corner weld joint of the long pipe seat with the top elbow is fundamentally solved;

2) The positioning and clamping modes are simple, convenient and efficient;

3) The position of the gun head of the welding gun can be adjusted;

4) The welding machine is designed into a handheld structure, and the weight is only about 4Kg; small occupied area, flexible maneuvering, simple and convenient operation and wide practical range.

Drawings

The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.

Fig. 1 is a schematic view of a welder according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a welder according to an embodiment of the invention.

Fig. 3 is a cross-sectional view of the welder shown in fig. 2 without the welding gun.

Fig. 4 is a schematic view illustrating an operating state of a welder according to an embodiment of the present invention.

For the sake of clarity, these figures are schematic and simplified drawings, which only give details which are necessary for an understanding of the invention, while other details are omitted.

Detailed Description

The scope of applicability of the present invention will become apparent from the detailed description given hereinafter. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only.

Fig. 1 shows a schematic view of a welder according to an embodiment of the present invention, fig. 2 shows a cross-sectional view of the welder shown in fig. 1, and fig. 3 shows a cross-sectional view of the welder shown in fig. 2 without a welding gun. As shown in fig. 1 to 3, the welding machine of this embodiment includes a machine body 4, a motor (not shown), a transmission mechanism 8, a U-shaped rotator 7, a U-shaped cable guide 9, a gun stand 11, a gun head 10, a gun cable 2, two front legs 13, two rear legs 14, a centering die 5, an elastic clamping plate 15, a handle 51, a cable inlet stand 17, and a spring 18. A handle 51 is provided on the upper surface of the machine body 4, a motor and a speed reducer (not shown) are provided in the handle 51, and the U-shaped rotator 7 is assembled on the machine body 4. The front and rear legs 13, 14 are provided on the body 4, respectively, and the height of the front and rear legs 13, 14 is adjustable, for example, by applying shims of different heights to make the heights of the front and rear legs 13, 14 different to suit different application situations. The center positioning die 5 is arranged at the bottom side of the U-shaped opening of the machine body 4, the center positioning die 5 is provided with replaceable positioning pins 50, the elastic clamping plates 15 are arranged at two sides of the U-shaped opening of the machine body 4, and the elastic clamping plates 15 are provided with replaceable clamping pins 52. The motor drives the U-shaped revolving body 7 to revolve clockwise and counterclockwise through a gear through a speed reducer and a transmission mechanism 8, and the machine body 4 is provided with a U-shaped opening. A U-shaped cable guide 9, such as a U-shaped cable trough, is fixed to the bottom plane of the U-shaped rotator 7 and rotates in synchronization therewith, and guide protrusions 9A may be provided at the upper and/or lower edges of the U-shaped cable guide 9 to better guide the winding of the cable 2 around the U-shaped cable guide 9, and a gun carrier 11 is height-adjustably provided on the U-shaped cable guide 9. For example, a chute is provided on the gun carrier 11, through which a projection provided on the wall of the U-shaped cable guide 9 passes, so that the gun carrier 11 can be moved up and down and can be fixed by a fixing means. The welding gun head 10 is arranged on the welding gun support 11, the welding gun head 10 is connected with the cable 2, the cable inlet support 17 is arranged on the machine body 4, the cable 2 of the welding gun passes through the cable inlet support 17, one end of the spring 18 is fixed on the cable inlet support 17, the other end of the spring 18 is fixed on the cable 2, one side of the U-shaped cable guide 9 is hinged with the bridge passing plate 16, and the bridge passing plate 16 can rotate to seal the opening of the U-shaped cable guide 9. In another embodiment, the bridge deck 16 may be foldable on itself, for example, made of two parts hinged together.

In another embodiment, the resilient clamping plate 15 may be connected to the clamping hand wheel 6 by a connection structure (not shown), rotation of the clamping hand wheel 6 in a clockwise and counterclockwise direction controlling clamping and unclamping of the resilient clamping plate 15 and vice versa.

Fig. 4 shows a schematic view of the operating state of the welding machine shown in fig. 1-3. The welding machine of the application is connected with the trolley 1 by an integrated cable 2, the cable 2 realizing the feeding of welding wire, water, gas and/or electricity. When the automatic welding operation of the external corner weld joint of the small tube seat is carried out, the small tube seat and the base metal are fixed by manual spot welding of 2-4 points by using an welding rod. Then, the split ends of the two front legs 13 of the welder are aligned and inserted into the tube seat so that the center positioning die 5 abuts against the outer wall of the tube, and the two front legs 13 and the two rear legs 14 contact the surface of the bottom base material. The elastic clamping plate 15 clamps the outer wall of the pipe inwardly by rotating the clamping hand wheel 6 clockwise.

The height of the gun rest 11 is adjusted so that the gun head 10 is precisely aligned with the welding area. After the welding is started, the welding gun head 10 carries the welding gun cable 2 to rotate around the pipe under the drive of the U-shaped cable guide 9, welding wires and shielding gas are conveyed to the welding gun head 10 through the cable 2, and automatic rotary welding is carried out on the external corner weld joint of the small pipe seat. During welding, the cable 2 is pulled into the welding machine through the cable inlet support 17 and wound around the outer wall of the U-shaped cable guide 9 for a circumference of e.g. 360 °, e.g. 400 °, while the springs 18 fixed to the cable inlet support 17 are compressed and stored in preparation for pulling out the cable 2. When the cable 2 is continuously fed in, the bridge plate 16 is pressed and swings inwards, and the inner arc of the bridge plate is just buckled at the opening of the U-shaped cable guide 9, so that the function of protecting the cable 2 is achieved. Lap welding, cap welding, and filling up the crater can be continued and rotation stopped. When the welding is completed, the return is started, the gun head 10 is reversed at high speed, the cable 2 is pulled out from the cable inlet bracket 17 by the spring 18, and the bridge plate 16 is automatically opened. The welder is removed and the next tube socket welding process can then be performed.

The welding machine solves the problem of automatic welding of the outer corner weld joints of the dense long pipe seats and the long pipe seats with the elbows at the tops, realizes continuous wire feeding of the welding gun cable wound around the pipe for one circle (more than or equal to 400 DEG) during the rotary welding of the welding gun by utilizing the positioning of the outer wall of the pipe, and can adopt a GMAW, FCAW or SAW welding method to carry out bottoming, wide pressing and cover surface welding on the small pipe seats and finally form the complete outer corner weld joint.

As used herein, the singular forms "a", "an" and "the" include plural referents (i.e., having the meaning of "at least one") unless otherwise indicated. It will be further understood that the terms "has," "comprises," "including" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

While certain preferred embodiments have been described above, it should be emphasized that the present invention is not limited to these embodiments, but may be practiced in other implementations within the scope of the inventive subject matter, which do not necessarily include all of the constituent components of the described embodiments.

Claims

1. The utility model provides a welding machine, includes organism (4), motor, drive mechanism (8) and U-shaped solid of revolution (7), the motor is passed through drive mechanism (8) drive U-shaped solid of revolution is clockwise and anticlockwise gyration, organism (4) have U-shaped opening, its characterized in that: a U-shaped cable guide piece (9) is arranged on the U-shaped revolving body (7), a welding gun bracket (11) is arranged on the U-shaped cable guide piece (9), a welding gun head (10) is arranged on the welding gun bracket (11), the welding gun head (10) is connected with a cable (2), a bridge passing plate (16) is hinged to one side of the U-shaped cable guide piece (9), and the bridge passing plate (16) can rotate to seal an opening of the U-shaped cable guide piece;

wherein the welding gun bracket (11) is arranged on the U-shaped cable guide (9) in a manner of being capable of moving up and down;

Wherein the welding machine further comprises a plurality of supporting legs (13, 14), and the supporting legs are arranged on the machine body (4).

2. Welding machine according to claim 1, characterized in that the U-shaped cable guide (9) is provided with guide protrusions (9A).

3. The welding machine according to claim 1, characterized in that the bridge plate (16) is foldable.

4. The welding machine according to claim 1, characterized in that it further comprises a centering die (5), said centering die (5) being arranged on the bottom side inside the U-shaped opening of the machine body (4), said centering die (5) being provided with a replaceable positioning pin (50).

5. The welding machine according to claim 1 or 4, further comprising a pair of elastic clamping plates (15), said elastic clamping plates (15) being arranged on both sides of the inside of the U-shaped opening of the machine body (4).

6. The welding machine according to claim 1, further comprising a cable inlet support (17) provided on the machine body (4), through which cable inlet support (17) the cable (2) of the welding gun passes.

7. The welding machine according to claim 6, characterized in that it further comprises a spring (18), one end of the spring (18) being fixed to the cable inlet support (17), the other end of the spring (18) being fixed to the cable (2).

8. The welding machine according to claim 1, further comprising a handle (51) extending upwardly from an upper surface of the machine body (4), the motor being disposed within the handle.