WO2018036535A1

WO2018036535A1 - Welding gun

Info

Publication number: WO2018036535A1
Application number: PCT/CN2017/098761
Authority: WO
Inventors: 张仁堂; 王文乐; 袁光伟
Original assignee: 北京文源同创科技有限公司
Priority date: 2016-08-25
Filing date: 2017-08-24
Publication date: 2018-03-01
Also published as: CN107775158A

Abstract

A welding gun, comprising a gun head and a cable. The gun head comprises a gun head body (11), a contact tube seat (12), a contact tube (13), and a nozzle (14). One or more airways (11A) are provided inside the gun head body (11), one or more air holes (12A) are provided in the contact tube seat (12), and a circular-arc welding wire channel (13A) is provided inside the contact tube (13). The nozzle (14) is joint with the gun head body (11), and the contact tube seat (12) is joint with the gun head body (11), so that gas out of the airway (11A) enters a cavity of the nozzle (14) by using the air hole (12A). The contact tube (13) is clamped to the contact tube seat (12), and the nozzle (14) encircles the contact tube (13) and the contact tube seat (12). The welding gun is applicable to automatic welding of outer fillet welds of a compact long tube socket and a long tube socket having an elbow at the top. The position of the gun head of the welding gun is adjustable, so as to adapt to different welding positions.

Description

Welding torch

Technical field

The present application relates to the field of welding, and in particular to a welding torch.

Background technique

The welding of the outer fillet welds of small pipe sockets is extremely common in actual production, such as boilers, pressure vessels, petrochemicals, shipbuilding and other industries, as well as other industrial fields.

For dense small pipe bases with small pitches and long pipe lengths with long lengths or tops with elbows, such as long pipe sockets on boiler headers, automatic welding of small pipe sockets has always been a problem. With the continuous improvement of boiler product parameters, the material grade of boiler headers has also been continuously improved. For high-parameter boilers, 12Cr1MoVG and above have become the main choice materials for container products. At present, such welding consumables are mainly flux-cored welding wires with a diameter of 1.2 mm. Due to the poor rigidity of the flux-cored welding wire, the wire feeding resistance is large and the welding stability is poor. At the same time, most of the header products are mainly long-seat structures. The welding operation space is small and the accessibility is poor. The material grade of the base metal and the complexity of the welded structure increase the difficulty of welding and put forward higher requirements for the guarantee of welding quality. At present, the small-seat fillet welds in the domestic boiler industry are all hand-welded, the welding workload is large, the labor intensity is large, the welding quality is greatly affected by human factors, the quality is not easy to guarantee, and the production efficiency is low.

In order to achieve automatic welding of the fillet welds outside the small tube, the design requirements of the welding torch are very high. At present, it has not been found that a welding torch capable of automatically welding a long tube seat and a long tube with an elbow at the top can be realized. The existing 30-45° gooseneck welding gun on the market is constrained by its large volume and narrow position of the welding zone, and it is impossible to realize the welding operation of the dense small pipe socket in the back area of the operator. Even for the welding of non-dense long-seat products with large pitch, most of them need to preheat 100-200 °C, and the operator needs to be very close to the workpiece to enable the gooseneck protection torch to reach the back of the small tube. In the area, the operation difficulty is still very large. Therefore, the welding of such products is basically welded by manual welding electrodes. The industry market for the same type of products is very urgent for the need for automatic welding.

Summary of the invention

The object of the present application is to provide a welding torch which can be applied to the automatic welding of the dense long pipe seat and the outer fillet weld of the long pipe head with the elbow at the top to greatly improve the degree of automation, production efficiency and product manufacturing quality.

The object of the present application is achieved by a welding torch comprising a pipe head and a cable, the pipe head comprising a pipe head body, a contact tip holder, a contact tip and a nozzle, the gun head body being internally provided with one or more gas The conductive nozzle holder is provided with one or more air holes, and the conductive nozzle is internally provided with a circular arc wire passage, the nozzle is engaged with the gun head body, and the conductive nozzle base and the gun head body Engagement causes gas exiting the air passage to enter the cavity of the nozzle through the air vent, the contact tip being engaged with the contact tip, the nozzle surrounding the contact tip and the contact tip.

According to an aspect of the welding gun of the present application, the contact tip is composed of two halves, and a symmetrical position of each half is provided with a semi-circular arc wire passage groove, and the semicircular arc wire passage grooves of the two halves are stacked in two halves. The circular arc wire passage is formed at the same time.

In accordance with one aspect of the welding gun of the present application, the cable includes a guidewire tube, a cannula, a cable, and a cable jacket, the sleeve surrounding the guidewire tube, the cable jacket surrounding the sleeve, the cable arrangement Between the sleeve and the cable jacket, there is a gap between the guide wire tube and the sleeve, and an outlet pipe is further disposed between the sleeve and the cable jacket.

According to an aspect of the welding gun of the present application, the wire guide tube includes a spring tube and an engineering plastic tube that are connected to each other.

According to an aspect of the welding gun of the present application, the cable is coupled to the tip by a swinging member, the swinging member including a swinging mandrel and a swinging mandrel, the swinging mandrel being rotatably inserted in the swinging core In the shaft casing, an inner hole of the swinging mandrel and an opening of the swinging mandrel casing form a passage for the guide wire tube to pass through, and the swinging mandrel outer casing is engaged with the pipe head body, the cable An outer sleeve is sleeved over the projection of the swinging mandrel.

According to another aspect of the welding gun of the present application, a fixing wire holder having a through hole is disposed in the inner hole of the swinging mandrel, and an end of the sleeve is sleeved on the fixing wire seat.

According to an aspect of the welding gun of the present application, the tip body is provided with an external spline, and the swinging mandrel is provided with a spline groove, and the external spline is engaged with the spline groove.

According to an aspect of the welding gun of the present application, the gun head body is provided with an adjusting bracket, the adjusting bracket is a Y-shaped structure, and an upper end opening of the Y-shaped structure is connected and fixed to the gun head body, and the Y-shaped The end of the lower end of the structure is provided with a groove.

The welding torch of the invention can be used for automatic welding of the outer fillet weld of the small pipe socket, which can perform small R winding, so that the wire arc welding can be realized in the small space rotating welding condition, such as GMAW/FCAW/SAW welding, overcoming the prior art. The main benefits and advantages of the limitations are as follows:

1) Replace the ordinary straight hole contact tip with a specially designed arc hole contact tip, so that the natural bending generated by the wire after winding is maintained until it is transported to contact the workpiece, thereby avoiding the straightening resistance of the straight hole contact tip;

2) The contact nozzle seat and the nozzle are designed to have an oblong shape, which can overcome the limitation of the wire bending and the narrow space of the welding zone, and ensure that the shielding gas range can cover the change of the arc position when the wire has a large dry elongation;

3) Due to the small diameter of the wire and the poor rigidity, especially the flux-cored wire is less rigid and the conveying distance is limited. When a general welding torch is used for flux-cored wire gas shielded welding (FCAW), if the welding torch is wound one turn, the wire cannot be fed at all, because the resistance of the wire feeding after winding is too large, the latter wire is unstable and even broken. The welding torch of the invention can realize stable conveying of the welding wire (included in the cable) even when the cable is wound ≥400°;

4) Applicable to outer diameter 1.2mm core and solid wire;

5) The position of the torch tip can be adjusted to suit different welding positions.

DRAWINGS

The invention will now be described more fully hereinafter with reference to the accompanying drawings

1 is a cross-sectional view and a plan view of a welding torch in accordance with an embodiment of the present invention.

2A and 2B are a front view and a cross-sectional view, respectively, of the tip body of the welding gun shown in Fig. 1.

3A and 3B are a cross-sectional view and a plan view, respectively, of the nozzle of the welding gun shown in Fig. 1.

4A and 4B are a cross-sectional view and a front view, respectively, of a contact tip of the welding torch shown in Fig. 1.

5A and 5B are a cross-sectional view and a plan view, respectively, of a contact tip of the welding torch shown in Fig. 1.

6A and 6B are a front view and a cross-sectional view, respectively, of the swinging mandrel of the welding gun shown in Fig. 1.

7A and 7B are a cross-sectional view and a left side view, respectively, of the oscillating mandrel jacket of the welding gun shown in Fig. 1.

8A and 8B are schematic cross-sectional views showing the fitting of the tip body and the swinging mandrel of the welding torch shown in Fig. 1, respectively.

For the sake of clarity, the drawings are schematic and simplified, and only the details necessary for understanding the invention are given, and other details are omitted.

detailed description

The scope of applicability of the present invention will be apparent from the detailed description given below. It should be understood, however, that the detailed description and specific examples are in the

1 shows a schematic view of a welding torch in accordance with an embodiment of the present invention. The welding torch includes a tip and a cable, and the tip is connected to the cable through a swinging member. The tip includes a tip body 11, a contact housing 12, a contact tip 13, and a nozzle 14. The tip body 11 is internally provided with one or more air passages 11A as shown in Figures 2A and 2B. The contact tip holder 12 has an oblong shape and is provided with a plurality of air holes 12A as shown in FIGS. 5A and 5B. The arcuate wire passage 13A is provided inside the contact tip 13. The radius of the arc of the circular arc wire channel can be adjusted according to the actual situation. In one embodiment, the contact tip 13 is composed of two halves, and the symmetrical position of each half is provided with a semi-circular arc wire channel groove, and the semicircular arc wire channel grooves of the two halves form an arc when the two halves are overlapped. The wire passage 13A is as shown in Figs. 4A and 4B. The nozzle 14 is an oblong hollow shape as shown in Figures 3A and 3B. The nozzle 14 is engaged with the tip body 11, and the tip holder 12 is engaged with the tip body 11 such that the gas from the air passage 11A enters the cavity of the nozzle 14 through the air hole 12A, and the contact tip 13 is engaged with the contact tip 12, and the nozzle 14 The contact tip 13 and the contact tip holder 12 are surrounded. The contact tip 13 can also be formed integrally.

In an embodiment, the cable includes a guidewire tube 21, a sleeve 22, a cable 23 and a cable jacket 24, the sleeve 22 enclosing the guidewire tube 21, the cable jacket 24 enclosing the sleeve 22, the cable 23 being disposed in the sleeve 22 and Cable Between the jackets 24, there is a gap between the guide wire tube 21 and the sleeve 22, and an outlet pipe 25 is also disposed between the sleeve 22 and the cable jacket 24. The wire guide tube 21 may be a spring tube or a spring tube 21A and an engineering plastic tube 21B connected to each other.

In an embodiment, the swinging member includes a swinging mandrel 31 and a swinging mandrel casing 32. 6A-7B show an illustrative embodiment of a swinging mandrel 31 and a swinging mandrel jacket 32, respectively. The swinging mandrel 31 is rotatably inserted into the swinging mandrel casing 32 to realize three functions of conducting, swinging, and gas sealing. The inner hole 31A of the swinging mandrel 31 and the opening 32A of the swinging mandrel casing 32 are formed for the wire guide tube. 21 passage through. The swinging mandrel cover 32 is provided with a spline groove 32B, and the tip body 11 is provided with external splines 11B as shown in Figs. 8A and 8B. The external spline 11B cooperates with the spline groove 32B to engage the swinging mandrel cover 32 with the tip body 11, so that the tip of the gun is connected to the swinging member in a quick-release manner, which is convenient to disassemble and realizes gas-tight sealing of the conductive and contact surfaces, and adjusts the swing by adjusting The swing angle of the mandrel jacket 32 allows adjustment of the wire pointing position.

When the cable is connected to the swinging mandrel, the cable jacket 24 is tightly fitted over the projection of the swinging mandrel 31, and the cable 23 is welded to the projection of the swinging mandrel 31. A fixing wire holder 31B having a through hole is provided in the inner hole of the swinging mandrel 31, and the end of the sleeve 22 is fitted over the fixing wire holder 31B so that the space between the cable outer casing 24 and the sleeve 22 and the swinging mandrel 31 A water seal is formed between them, and water cannot enter the swinging mandrel casing 32 and the tip by the swinging mandrel 31.

In an embodiment, the gun body 11 is provided with an adjustment bracket 15 which is a Y-shaped structure, the Y-shaped upper end opening is connected to the gun body 11 and fixed, and the Y-shaped lower end straight end and the nozzle 14 The flush, Y-shaped lower end straight section is also provided with a rectangular groove for adjusting the angular position of the tip body 11 by a special tool.

In use, the cable jacket 24 and the casing 22 are filled with water, the cable 23 is water-cooled, and the circulating water flows out of the cable through the outlet pipe 25. This embodiment of the invention employs a water cooling mode, and other cooling modes may be employed in other embodiments. The shielding gas is supplied between the sleeve 22 and the guide wire tube 21, and the shielding gas enters the air passage 11A of the tip body 11 through the through hole of the fixing wire holder 31B and the opening of the swinging mandrel housing 32. The guide wire tube 21 passes from the fixed wire holder 31B, the swinging mandrel 31, and the swinging mandrel cover 32 to the tip of the gun. a wire (through a straight hole) that passes through the guide wire tube 21 into the tip body 11 The track then enters the arc-shaped wire passage 13A in the contact tip 13, and is bent downward by 90° through the arc-shaped wire passage 13A to be transported to the welded portion for welding.

The material, strength and inner diameter of the wire guide tube 21 can be selected as needed. In the embodiment, a combination of the front copper spring tube 21A and the rear engineering plastic tube 21B is adopted, and the inner diameter of the engineering plastic tube is larger than the outer diameter of the welding wire by 0.2-0.3 mm to reduce the welding wire in the inner hole of the guide tube. Bending, thereby increasing the rigidity against the conveying resistance. The outer diameter of the engineering plastic tube 21B is greater than or equal to 5 mm, and the tensile strength is greater than the destabilizing strength of the flux-cored wire, ensuring that the wire feeding force is large enough and the plastic tube is not stretched.

The singular forms "a", "the", and "the" It is to be understood that the terms "comprising", "comprising", and" Features, steps, operations, elements, components, and/or combinations thereof. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Some preferred embodiments have been described above, but it should be emphasized that the present invention is not limited to the embodiments, but may be implemented in other embodiments within the scope of the inventive subject matter, and other embodiments do not necessarily include the implementation. All the components of the example.

Claims

A welding torch comprising a gun head and a cable, characterized in that the gun head comprises a gun body (11), a contact tip (12), a contact tip (13) and a nozzle (14), the tip body (11) internally provided with one or more air passages (11A), the conductive nozzle seat (12) is provided with one or more air holes (12A), and the conductive nozzle (13) is internally provided with a circular arc wire passage (13A), the nozzle (14) is engaged with the tip body (11), and the contact tip (12) is engaged with the tip body (11) such that it comes out of the air passage (11A) Gas enters the cavity of the nozzle (14) through the air hole (12A), the contact tip (13) is engaged with the contact tip seat (12), and the nozzle (14) surrounds the contact tip (14) 13) and the contact tip holder (12).
A welding torch according to claim 1, wherein said contact tip (13) is composed of two halves, each of which is provided with a semicircular arc wire channel groove at a symmetrical position, and said semicircular arc shape of the two halves. The wire passage groove forms the circular arc wire passage (13A) when the two halves are overlapped.
A welding torch according to claim 1, wherein said cable comprises a wire guide tube (21), a sleeve (22), a cable (23) and a cable jacket (24) surrounded by said sleeve (22) The guide wire tube (21), the cable jacket (24) surrounds the sleeve (22), and the cable (23) is disposed between the sleeve (22) and the cable jacket (24) There is a gap between the guide wire tube (21) and the sleeve (22), and an outlet pipe (25) is further disposed between the sleeve (22) and the cable jacket (24).
The welding torch according to claim 3, characterized in that the wire guide tube (21) is a spring tube.
A welding torch according to claim 3, characterized in that said wire guide tube (21) comprises a spring tube (21A) and an engineering plastic tube (21B) connected to each other.
A welding torch according to claim 3, wherein said cable is coupled to said tip by a swinging member, said swinging member comprising a swinging mandrel (31) and a swinging mandrel casing (32), said swinging A mandrel (31) is rotatably inserted into the oscillating mandrel casing (32), an inner hole (31A) of the oscillating mandrel (31) and an opening of the oscillating mandrel casing (32) (32A) ) formed for the guide wire tube (21) A passage through which the swinging mandrel casing (32) engages with the tip body (11), and the cable jacket (24) fits over the projection of the swinging mandrel (31).
The welding torch according to claim 6, characterized in that the inner hole of the swinging mandrel (31) is further provided with a fixing wire seat (31B) having a through hole, and the end sleeve of the sleeve (22) On the fixed wire holder (31B).
A welding torch according to claim 6, wherein said tip body (11) is provided with an external spline (11B), and said swinging mandrel casing (32) is provided with a spline groove (32B), said outer The spline (11B) is engaged with the spline groove (32B).
The welding torch according to claim 5, characterized in that the outer diameter of the engineering plastic tube (21B) is 5 mm or more.
The welding torch according to claim 1, wherein the tip body (11) is provided with an adjustment bracket (15), the adjustment bracket (15) is a Y-shaped structure, and the upper end of the Y-shaped structure is open. The gun body (11) is connected and fixed, and the end of the lower end of the Y-shaped structure is provided with a groove.