CN112739483A

CN112739483A - High-conductivity durable welding contact nozzle

Info

Publication number: CN112739483A
Application number: CN202080004133.XA
Authority: CN
Inventors: 何强; 何珍; 汪年成
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-11
Filing date: 2020-08-06
Publication date: 2021-04-30
Also published as: WO2021027663A1

Abstract

The high-conductivity durable welding contact nozzle comprises a main body (10), a heat insulation sleeve (20) and a spring (30), wherein a welding wire through hole (12) is formed in the main body, a conductive block (13) is arranged on the front section of the main body, a cavity is formed in the heat insulation sleeve and connected with a yielding hole (22), and a welding wire penetrates through the welding wire through hole and the conductive block and then penetrates out of the yielding hole to be sent into a welding pool to weld a workpiece. The heat insulation sleeve isolates the conductive block from high-temperature electric arc, the spring is made of high-temperature-resistant alloy, and the spring provides elasticity for the conductive block, so that the conductive nozzle can always continuously keep a good contact state with a welding wire in a high-temperature environment in continuous high-current welding production, and the conductivity of the conductive nozzle is improved. The contact part of the conductive block and the welding wire is a guide groove (19) with a plane or a small cambered surface, so that the abrasion of the contact tip is reduced, and the service life is prolonged.

Description

High-conductivity durable welding contact nozzle and method

Technical Field

The invention belongs to the technical field of conductive nozzles for welding, and relates to a structure of a high-conductivity durable welding conductive nozzle, and a method for improving the conductivity and prolonging the service life of the conductive nozzle. The method is characterized in that compared with the prior art, the service life and the conductivity are remarkably prolonged. The structure is simpler and finer, and the contact tube is easier to process; the diameter is smaller, which is beneficial to the flow of protective gas and the protection of a molten pool; the length is shorter, the use requirement of welding in a narrow space can be met, and the adaptability is wider; and can be continuously used in an extremely high temperature environment with a large current.

Background

The contact tip is a key part of gas metal arc welding and mainly plays a role in conducting electric energy to a welding wire. A hole is formed in the middle of a traditional contact nozzle, a welding wire passes through the hole at a constant speed during welding, the welding wire is in friction with the wall of the hole, the hole is ground to be larger by the welding wire along with the welding, and due to the fact that the welding is carried out at a high temperature, materials of the contact nozzle become soft after the temperature of the contact nozzle rises, and the abrasion of the hole is further accelerated. The contact with the welding wire is poor after the hole is enlarged, and the conductivity is poor, so that a new contact tip needs to be replaced. In order to ensure the welding quality, a regular welding manufacturer usually replaces one contact nozzle within 4-8 hours, which results in a great consumption of the contact nozzle. Even if in time change traditional contact tube, but contact tube is in the use, along with the wearing and tearing of this hole, electric conductive property also can attenuate gradually.

The long-acting contact tube invented by Shijiarong, patent No. 2010101939023, attempts to solve the disadvantages of the conventional contact tube, such as short service life and gradual attenuation of conductivity along with the progress of welding. The invention improves the service life of the contact nozzle by the two clamping blocks at the front end of the conductive inner core, and tries to make the clamping blocks have elasticity, so that the clamping blocks can always keep good contact with the welding wire even after being worn, thereby realizing the purpose of no attenuation of the conductivity. The long-acting conductive nozzle of the invention breaks through the structure of the traditional conductive nozzle, provides a brand new design concept for prolonging the service life and improving the conductivity of the conductive nozzle, but has the defects. The conductive nozzle of the invention consists of three parts, namely a porcelain cap, a conductive inner core and a tailstock, and according to the application specification and the specification drawings, the tailstock has a very chicken rib effect, so that the effect is not great, and the length of the conductive nozzle is increased. It is known that the contact tip is a small part, the shortest size being only 20 mm, and it is difficult to implement the above solution in such a short space. It is known that the temperature of the welding arc is as high as 6000-. The distance between the clamping blocks is increased under the action of the welding wire with radian, so that the conductivity of the long-acting conductive nozzle of the invention can not be improved at all but can be obviously reduced under the action of high temperature, thereby causing serious quality accidents. The long-acting contact nozzle has extremely poor high-temperature resistance and is the fatal defect of the invention.

Disclosure of Invention

To overcome the various disadvantages of the prior art, the present invention provides a more elaborate contact tip. The conductive nozzle is divided into a main body and a heat insulation sleeve, the front end of the main body is divided into two structures, one structure is similar to the traditional conductive nozzle, and the front end of the main body of the other structure is provided with two conductive blocks which are symmetrically distributed. The conductive block clamps the welding wire by utilizing the elasticity of the conductive block, so that the welding wire is fully contacted with the conductive block, and the conductive block is conductive to the welding wire and is worn by the welding wire. The heat insulation sleeve is fixed at the front end of the main body, and the conductive block is covered in the heat insulation sleeve. The insulating sleeve isolates the conductive block from heat from the molten pool, thereby well controlling the temperature of the conductive block. In order to achieve a better cooling effect, a heat insulation groove or a heat dissipation groove is formed in the main body and the heat insulation sleeve; in addition, a heat insulation ring can be additionally arranged between the heat insulation sleeve and the main body. In order to achieve the best heat insulation effect, the main body is prevented from being exposed due to the strength, and the main body is wrapped in the heat insulation sleeve due to the strength of the heat insulation sleeve.

In order to minimize the length of the conductive block, but to provide the conductive block with optimal elasticity. And a spring is arranged outside the conductive block and is tightly attached to the conductive block, so that the elasticity of the conductive block is improved. In order to avoid welding spatter from adhering to the spring, the spring is subjected to spatter-proof treatment such as spatter-proof liquid coating, chrome plating, copper plating and the like. The spring is made of high-temperature resistant materials, such as 304, 17-7PH, 15-7Mo, 30W4Cr2VA, H13, GH2132, GH2135, GH4145, GH4169, GH4090, GH5605, Inconel X-750, Inconel718 and Nimonic90, and the like, and the spring can have good elasticity even in a high-temperature environment.

The technical scheme adopted by the invention for solving the technical problems is as follows: the contact tip is divided into a main body and a heat insulation sleeve, the rear part of the main body is used for connecting the contact tip with a welding gun, and the connection mode is not limited to threads but is determined according to the connection mode provided by the welding gun. The main part has two kinds of structures, and a structure is similar with traditional contact tip, and the welding wire via hole is on the axis of main part promptly to link up the main part, the welding wire passes through from the welding wire via hole, and the pore wall of welding wire via hole is electrically conductive for the welding wire, and is worn and torn by the welding wire. The other structure is that the rear part of the main body is provided with a welding wire through hole, the front part is provided with two conductive blocks which are symmetrically distributed, the front ends of the two conductive blocks are closed, and the welding wire through hole and the two conductive blocks are closed on the same axis. The cross-sectional shapes of the middle parts of the main bodies of the two structures are circular, oval, racetrack-shaped or polygonal, and one side of the middle part close to the conductive block is provided with a connecting part. The heat insulation sleeve is of a hollow structure, the front end of the heat insulation sleeve is provided with an avoiding hole, and the circle center of the avoiding hole is located on the axis of the heat insulation sleeve. The cross section of the heat insulation sleeve is circular, oval, racetrack-shaped or polygonal. In order not to obstruct the flow of the shielding gas, the outer diameter of the sleeve should be sized to conform to the outer diameter of the nozzle body, or smaller. The rear end of the heat insulation sleeve is connected with the connecting part of the main body, and the welding wire through hole of the main body and the avoiding hole of the heat insulation sleeve are positioned on the same axis. The heat insulation sleeve isolates the main body of the contact tube from a molten pool, so that the temperature of the main body of the contact tube is always in a lower state, and the wear resistance of the contact tube is improved. The inner space of the heat insulation sleeve is large enough to keep a certain gap between the front end of the contact tip and the heat insulation sleeve, and particularly, the contact between the front end of the main body and the heat insulation sleeve is avoided. In addition, a heat insulation groove or a heat dissipation groove can be formed in the main body and the heat insulation sleeve; a heat insulation ring is added between the heat insulation sleeve and the connecting part; and the main body is completely wrapped in the heat insulation sleeve, and the temperature of the main body of the contact tube is further reduced.

In order to conduct electric energy to a welding wire well, a conventional contact tip is generally made of copper with good electric conductivity, but the metal of copper is soft, low in yield strength and poor in elasticity. The long-acting contact tip invented by Shijiarong needs to provide good clamping force for the welding wire under the condition that the clamping block is abraded so as to ensure that the electric energy received by the welding wire is not reduced in the welding process. This requires the clamping block to have good resilience, but copper is a metal with poor resilience, and thus a pair of contradictions are formed between the two. If phosphor bronze, beryllium copper, etc. are used to increase the elasticity of the clamping block, it is not a good solution because the addition of the alloy metal to this material will reduce the electrical conductivity of the clamping block. As mentioned above, the softer metal also gains good resilience when the ratio of the length of the metal to the cross-section is high. In the long-acting contact tip of the invention, the elasticity of the clamping block is provided by the connecting piece, and when the length of the connecting piece is not changed, the section size of the connecting piece needs to be reduced in order to obtain good elasticity. The small section size makes the clamping force of the clamping block too small, is not beneficial to restraining the welding wire, reduces the accuracy of the welding wire, and the welding seam is welded slantwise, so that the situation is more obvious when the robot is used for automatic welding. In order to increase the clamping force of the clamping block, the length of the connecting piece has to be increased, and the length of the connecting piece is increased, so that the length of the whole contact tube is increased, and the application range of the contact tube is limited. In order to solve the contradictions, namely the contact tip has good conductivity, the clamping block has good elasticity while ensuring the proper clamping force, and the length of the contact tip is also as short as possible, the only method is to add a spring made of metals with high yield strength and high softening temperature, such as 304, 17-7PH, 15-7Mo, 30W4Cr2VA, H13, GH2132, GH2135, GH4145, GH4169, 4090, GH5605, GH Inconel X-750, Inconel718 and Nimonic90, to a mechanism for clamping the welding wire of the contact tip, so as to improve the elasticity of the contact tip. In the invention, the conductive block of the main body is provided with the spring with good elasticity to enhance the elasticity of the conductive block, and because the metal for manufacturing the spring has good elasticity and high softening temperature, the spring can also have good elasticity even under the condition that the self temperature is high when the metal is baked by the high temperature of a molten pool, thereby well solving the problem. The front end of the spring is divided into two elastic sheets which are symmetrically arranged and respectively correspond to the two conductive blocks, and the rear end of the spring is provided with a fixing ring for fixing on the conductive nozzle main body. In addition, the spring may be made of wire with different cross-sections, and the overall shape of the spring may be changed accordingly. In order to avoid the adhesion of welding spatter, the spring can be subjected to anti-spatter treatment such as chromium plating, copper plating and the like, and in addition, the method for preventing the spatter adhesion is also a good method for preventing the spatter adhesion by spraying the anti-spatter liquid on the spring.

In the invention, the spring is arranged on the conductive block of the main body of the conductive nozzle, the heat insulation sleeve is arranged at the front end of the main body, and the main body, the spring and the heat insulation sleeve are matched for use, so that the best use effect can be obtained.

The invention has the beneficial effects that: the front end of the main body of the contact tube is provided with the symmetrically arranged conductive blocks which conduct electricity for the welding wire and provide more materials for the welding wire to wear than the conventional contact tube, so that the service life of the contact tube is prolonged by times, and the conductivity of the contact tube is improved. The heat insulating sleeve is arranged at the front end of the contact tube main body, so that heat from an electric arc is isolated, the temperature of the contact tube main body can be reduced no matter the front end of the main body is of a structure with a contact block or a structure with only a welding wire through hole as a traditional contact tube, the temperature is reduced, the wear resistance is good, and the service life is naturally prolonged. Moreover, the elasticity of the conductive block cannot lose efficacy due to the temperature reduction, so that good clamping force on the welding wire can be always kept in the welding process, and the conductivity of the welding wire cannot be attenuated. The heat insulating sleeve is arranged on the main body, and compared with a long-acting contact nozzle, the long-acting contact nozzle has the advantages that the porcelain cap is connected to the tailstock, the diameter of the contact nozzle can be reduced, and the length of the contact nozzle is shortened. The contact tube manufactured by the technical scheme becomes finer and smaller, can be used in a welding environment with a narrow space, and widens the application range of the contact tube.

The spring is arranged outside the conductive block and is made of materials such as 304, 17-7PH, 15-7Mo, 30W4Cr2VA, H13, GH2132, GH2135, GH4145, GH4169, GH4090, GH5605, Inconel X-750, Inconel718 and Nimonic90 (along with the continuous development and progress of scientific technology, materials with better elasticity and higher softening temperature can appear in the future), and the elastic sheet of the spring is attached to the conductive block, so that the elasticity of the conductive block is increased, and the conductive nozzle becomes finer and smaller. Because the softening temperature of the material for manufacturing the spring is high, the spring can have good elasticity even under the severe working environment that the high-temperature radiation of the electric arc and the self temperature are also high. Due to the action of the spring, the elasticity of the conductive block is not reduced but enhanced. The conductive block is made of copper, so that the conductive block has good conductivity, the spring is arranged outside the conductive block, the conductive block is endowed with better elasticity, and the conductive block and the spring are organically combined, so that the performance of the conductive nozzle is more excellent.

The contact tip can not be used continuously until the contact block is completely worn from the beginning of use, and the welding wire is always clamped by the contact block in the process, so that the contact block is not spread by the welding wire due to high-temperature softening. There is not the clearance between welding wire and the conducting block, also can not swing, and under this condition, the welding wire stretches out from the same place of contact tip all the time, and it is more accurate to go out the silk, makes welded weld more central. Because the conductivity is improved, the arc striking is easier, the electric arc is more stable in the welding process, and meanwhile, the welding spatter is reduced.

Drawings

FIG. 1 is a structural view of a conventional high-conductivity durable welding contact tip with a heat insulation sleeve

FIG. 2 is a block diagram of a high conductivity durable welding tip with conductive blocks inside the insulating sleeve.

Fig. 3 is a structural view of a highly conductive durable welding tip with a spring.

Fig. 4 is a structural view of a highly conductive and durable welding tip having a spring structure in the form of an elastic rib.

Fig. 5 is a block diagram of a highly conductive durable welding tip with a guide wire catheter.

Fig. 6 is a structural view of a high-conductivity durable welding contact tip with a spring structure in a V shape.

Fig. 7 is a block diagram of a highly conductive durable solder contact tip with a tapered via.

Fig. 8 is a structural view of a high-conductivity durable welding contact tip with a wire sleeve.

FIG. 9 is a block diagram of a highly conductive durable welded contact tip with an insulating mat.

Fig. 10 is a structural view of a highly conductive durable welding tip with an extension.

Fig. 11 is a block diagram of a high conductivity durable solder contact tip with a female snap.

Fig. 12 is a block diagram of a crimped, highly conductive and durable solder contact tip.

Fig. 13 is a structural view of a high conductive durable welding contact tip with thickened conductive bumps.

Fig. 14 is a view showing a main body structure of a conductive bump having a convex shape.

Fig. 15 is a structural view of a highly conductive durable welding tip with a connecting pin.

Fig. 16 is a block diagram of a highly conductive durable welding tip with a rotating bore.

Fig. 17 is a structural view of a high-conductivity durable welding tip with a coil spring as a spring.

Fig. 18 is a block diagram of a highly conductive durable welding tip with coil spring force as a monofilament.

Fig. 19 is another structural view of the main body.

FIG. 20 is a block diagram of a contact tip body with a portion of the contact block having a flexible conductive tab.

FIG. 21 is a view showing a structure of a contact tip core body having oblique slits between conductive bumps, which makes portions of the conductive bumps soft.

FIG. 22 is a view of the contact tip structure using a "C" shaped spring.

FIG. 23 is a block diagram of several ways of connecting the contact tip tail to the torch.

Fig. 24 is a structural view of a typical spring.

Fig. 25 is a structural view of the leaf spring.

Fig. 26 is a block diagram of a highly conductive durable welding tip having a wrench face for the body.

The numbering in the figures means: 10-main body, 11-connecting part, 111-internal thread, 112-external thread, 113- 'T' -shaped, 114-conical shape, 115-straightening part, 116-main body, 12-welding wire via hole, 13-conducting block, 131-forming opening, 132-conducting block root, 133-external protrusion, 134-core body, 135-positioning slot, 136-conducting body, 137-flanging, 14-soft conducting sheet, 141-soft conducting sheet root, 15-accommodating slot, 16-extending part, 17-avoiding slot, 171-rotating hole, 18-contact part, 19-guiding slot, 20-heat insulating sleeve, 21-heat insulating slot, 22-avoiding hole, 23-conical guiding hole, 24-concave buckle, 25-curling edge, 26-wrench surface, 30-spring, 31-fixed ring, 32-elastic sheet, 33-elastic rib, 34-arc rib, 35-support sheet, 40-welding wire guide tube, 50-guide sleeve, 51-guide wire hole, 60-heat insulation pad, 70-connecting pin and 80-anti-drop cover.

Detailed Description

Example 1: as shown in fig. 1, the contact tip is composed of a main body 10 and an insulating sleeve 20. The rear end of the main body 10 is connected to a welding gun in a manner determined according to a connection manner with a contact tip set on the welding gun. The body 10 has a circular, oval, racetrack, or polygonal shape. On the axis of the main body 10 is a welding wire through hole 12, and the welding wire through hole 12 is a constant diameter hole which is slightly larger than the welding wire so that the welding wire can pass through smoothly. The wire vias 12 should not be too large, otherwise the ability of the tip to conduct electricity to the wire is reduced. The weld penetration is reduced and even the defect of unfused welding appears. Too large aperture of the welding wire through hole 12 can also lead to inaccurate wire discharge of the welding wire and uneven welding of the welding seam. The main body 10 has a connection part 11, and the connection part 11 connects the main body 10 and the heat insulating cover 20 together. The connection mode of the main body 10 and the heat insulation sleeve 20 can be various forms such as a threaded connection, an interference connection, a pin connection, a press-and-recess connection, and a welding connection. The shape of the sleeve 20 is circular, oval, racetrack, or polygonal. The inside of the heat insulation sleeve 20 is a cavity structure. The heat insulating sleeve 20 wraps the main body 10 in the cavity and keeps a certain gap, and the gap enables the contact tip to have better heat insulating effect. The heat insulating sleeve 20 is provided with a heat insulating groove 21, and the heat insulating groove 21 is used for weakening the heat transferring capability of the heat insulating sleeve 20 when receiving the high temperature of the molten pool, so that the heat transferring from the heat insulating sleeve 20 to the main body 10 can be minimized. The number of the heat insulation grooves 21 is determined as needed, and the heat insulation grooves 21 may be provided on the outer surface or the inner surface of the heat insulation jacket 20 as needed. The heat insulation groove 21 may be provided on the body 10, particularly, at a portion contacting the heat insulation jacket 20. When the main body 10 and the heat insulating jacket 20 are assembled, they may not be assembled in place, so that a small gap may be left between the main body 10 and the heat insulating jacket 20, and the effect of reducing heat transfer may be obtained. In order to minimize the temperature of the body 10, the thermal sleeve 20 should enclose the body 10 as completely as possible within its cavity. The front end of the heat insulation sleeve 20 is provided with a relief hole 22, and the aperture of the relief hole 22 is larger than that of the welding wire, so that the welding wire can pass through the relief hole conveniently. The relief hole 22 is on the same axis as the wire passing hole 12 on the main body 10.

The inside of the body 10 may be a non-uniform diameter hole having a smaller diameter at the wire outlet of the front end of the body 10 than in other areas, and the diameter of the small hole of the front end of the body 10 is equivalent to the diameter of the wire. The body 10 still has an insulating sheath 20 thereon, which can be repaired when the welding wire grinds the hole of the front end of the body 10 to be large. The method is to take off the heat insulating sleeve 20, and apply an external force to the front end of the welding wire to reduce the worn hole at the front end of the main body 10 to a degree equivalent to the diameter of the welding wire. After repair, the thermal insulation sleeve 20 is installed, and when the hole at the welding wire outlet of the main body 10 is abraded again, the hole is repaired by the same method, so that the contact tip can be repeatedly used, and the service life of the contact tip is prolonged. In order to facilitate the repair of the worn welding wire at the welding wire outlet, the outer diameter of the front end of the main body 10 can be properly reduced, namely, a thin-wall structure is adopted, and the wall thickness is about 0.1-2 mm. Even if the welding wire passing hole 12 is an equal-diameter hole, the welding wire wears the hole during welding to increase the diameter of the hole, and then the heat insulating sleeve 20 is removed, and the welding wire passing hole at the outlet of the welding wire main body 10 is reduced to change the hole inside the main body 10 into an unequal-diameter hole. When the main body 10 needs to be repaired after the thread outlet is worn, the heat insulating sleeve 20 is preferably screwed to the main body 10 in order to facilitate the removal and installation of the heat insulating sleeve 20.

The heat insulation sleeve 20 can be further processed with symmetrically distributed planes, so that the conductive nozzle can be conveniently mounted on the welding gun by using tools such as a wrench, and can be conveniently detached during replacement, and the symmetrically distributed planes can also be processed on the main body 10. If the main body 10 and the heat insulating jacket 20 have a polygonal shape and have a flat surface, additional processing is not required.

Example 2: as shown in fig. 2, the contact tip is composed of a main body 10 and an insulating sleeve 20. The front end of the main body 10 is provided with two conductive blocks 13 (not limited to two) which are symmetrical parts, the front ends of the two conductive blocks 13 are close, the close position and the welding wire through hole 12 are positioned on the same axis, and the section sizes and the lengths of the two conductive blocks 13 are kept consistent. The conductive bumps 13 are sufficiently elastic so that the ratio of the length to the cross-sectional dimension is within a reasonable range. At the same time, the conductive block 13 needs to have a proper clamping force, and the conductive block 13 also needs to provide enough material for the welding wire to wear, so the cross-sectional size cannot be too small. In order to prolong the service life of the contact tip, the stiffness is such that the contact block 13 has a longer contact surface with the welding wire. The cross-sectional dimension of the conductive block 13, the ratio of the length to the cross-sectional dimension, needs to be determined by precise calculation and trial and error, otherwise the usability of the contact tip is affected. The rear end of the body 10 is connected to a welding gun in a manner determined according to the connection manner of the welding gun. The heat insulating sleeve 20 has a hollow interior, and a rear end connected to the connecting portion 11 of the main body 10. The connection means may be various forms such as a screw connection, an interference connection, a pin connection, a staking connection, a welding connection, etc., as long as the heat insulating jacket 20 can be fixed to the main body 10. The heat insulating sleeve 20 is made of a material which has good heat insulating performance, is resistant to high temperature and is not easy to adhere and weld spatter. In order to generate a good heat insulation effect, the heat of the heat insulating sleeve 20 is minimally transmitted to the conductive block 13 of the main body 10, and the heat insulating groove 21 is provided at the rear end of the heat insulating sleeve 20 so as not to cause the temperature of the conductive block 13 to be too high. The front end of the sleeve 20 is closest to the bath and therefore has the highest temperature, and the heat at the front end of the sleeve 20 is slowly diffused toward the rear end as time passes. The rear end of the heat insulation sleeve 20 is provided with a groove (i.e. a heat insulation groove) so that the material at the groove is reduced. It is known that heat is transferred through a medium, and the material (heat transfer medium) is reduced, so that the heat transfer is weakened, the heat transferred out is reduced, and the purpose of cooling is achieved. The heat insulation groove 21 may be provided on the outer surface of the heat insulation jacket 20 or may be provided on the inner surface thereof as needed. The heat insulation groove 21 may be provided in the main body 10, particularly in a portion in contact with the heat insulation jacket 20, but may be provided in other portions. Alternatively, when the heat insulating jacket 20 is attached to the main body 10, the heat insulating jacket 20 may be intentionally not attached to the main body 10, and a slight gap may be left between the heat insulating jacket 20 and the main body 10. The front end of the heat insulation sleeve 20 is provided with a relief hole 22, and the aperture of the relief hole 22 is larger than that of the welding wire, so that the welding wire can pass through the relief hole conveniently. The relief hole 22 is on the same axis as the wire passing hole 12 on the main body 10. In order to reduce the temperature of the conductive block 13, a proper gap should be left between the conductive block 13 and the heat insulating sleeve 20, and even not in direct contact with the heat insulating sleeve 20.

When the conductive block 13 is worn to the extent that the welding wire is shaken remarkably, the hole can be reduced in the manner of embodiment 1, and the contact tip can still be used repeatedly.

Example 3: as shown in fig. 3, the contact tip is composed of two parts, a body 10 and a spring 30. The rear end of the spring 30 is provided with a fixing ring 31, and the cross section of the fixing ring 31 can be circular, oval, racetrack-shaped and polygonal, and the specific shape is determined according to actual needs. The spring 30 is made of materials with good elasticity and high softening temperature, such as 304, 17-7PH, 15-7Mo, 30W4Cr2VA, H13, GH2132, GH2135, GH4145, GH4169, GH4090, GH5605, Inconel X-750, Inconel718 and Nimonic 90. The front end of the spring 30 is provided with two elastic pieces 32 which are symmetrically distributed, and the elastic pieces 32 are closely attached to the conductive block 13 of the main body 10 to provide elastic force for the conductive block 13. The conductive block 13 of the body 10 may have the shape of embodiment 1, i.e., the cross section of the whole is substantially uniform. However, the spring 30 has a good elasticity, and the conductive block 13 itself also has a certain elasticity, and the two are overlapped together, so that the elasticity is larger. The risk that the welding wire is unsmooth to come out due to too large force of the conductive block 13 for clamping the welding wire is easy to occur. If this occurs, the rear half of the conductive block 13 may be processed into the flexible conductive piece 14 (the flexible conductive piece 14 is still a part of the conductive block 13), and the cross-sectional size of the flexible conductive piece 14 is smaller than the front end of the conductive block 13, so that the elastic force of the conductive block 13 is reduced and only the conductive function is imparted thereto. The fixing ring 31 is connected to the main body 10 to fix the spring 30 to the main body 10, and since the elastic pieces 32 are required to be stacked on the conductive block 13, appropriate measures should be taken to prevent the spring 30 from being displaced and rotated. The connection means for preventing the displacement and rotation of the spring 30 may be various forms such as a screw connection, an interference connection, a pin connection, a staking connection, and a welding connection. Alternatively, the spring 30 may be provided with a special profile, such as a race track, oval, polygon, etc., to prevent rotation. There are, of course, other ways, which are not listed here. In order to prevent welding spatter from adhering to the spring 30, the spring 30 may be subjected to spatter-proof treatment such as chromium plating or copper plating. In addition, the spring 30 is coated with the splash-proof liquid, so that the splash adhesion can be avoided.

In this embodiment, the spring 30 provides sufficient elastic force for the conductive block 13, and the conductive block 13 itself has some elastic force, so that the clamping force of the conductive block 13 may be too large to make the wire of the welding wire not smoothly come out. However, if the cross-sectional size of the flexible conductive piece 14 is reduced to soften the conductive block 13, the transmission of electric power cannot be affected. If the flexible conducting sheet 14 is made of a plurality of flexible thin copper wires or thin copper sheets, the front section of the conducting block is kept unchanged and still plays a role in clamping the welding wire. The thin copper wire and the thin copper sheet not only can play a role in transferring electric energy, but also more importantly, the whole conductive block 13 is made to be very soft, and the conductive block 13 provides clamping force and elasticity for the conductive block 13 by virtue of the spring 30. At this time, the copper block at the front section of the conductive block 13 needs to be fixed on the elastic sheet 32 at the front end of the spring 30, and the stable structure of the spring 30 is used to provide support for the conductive block 13, so that the defect that the flexible conductive sheet 14 is easy to displace due to being too flexible can be overcome. The fixing manner of the copper block at the front section of the conductive block 13 and the spring 30 may be a plurality of manners such as snap-in fixing, interference fixing, pin fixing or welding fixing.

Example 4: as shown in fig. 4, this embodiment is another form of spring. The spring 30 in this embodiment is composed of elastic ribs 33 and arc ribs 34, and the cross-sectional shape of the spring 30 is circular or polygonal. The spring 30 is made of a high temperature spring material. The arc ribs 34 are used for fixing the spring 30 on the conductive blocks 13, each conductive block 13 is provided with one arc rib 34, the elastic ribs 33 are used for enabling the spring 30 to have elasticity, and the elastic ribs 33 are connected with the upper arc rib 34 and the lower arc rib 34. The main body 10 has receiving grooves 15 for receiving the elastic ribs 33 of the spring 30. The rear end of the conductive block 13 may be formed as the flexible conductive piece 14, but the flexible conductive piece 14 may not be formed if the elastic force is suitable. In order to prevent the spring 30 from falling off, a positioning groove 135 can be formed on the conductive block 13, and the arc rib 34 is disposed on the positioning groove 135. In addition, the arc rib 34 can be arranged on the flexible conducting strip 14, and the spring 30 can not fall off because the flexible conducting strip 14 has a smaller section than the front end of the conducting block 13.

In order to prevent welding spatter from adhering to the spring 30, the spring 30 may be subjected to spatter-proof treatment such as chromium plating or copper plating. In addition, the spring 30 is coated with the splash-proof liquid, so that the splash adhesion can be avoided.

Example 5: as shown in fig. 5, the conductive block 13 is elongated. The object is to provide sufficient elasticity of the conductive block 13 without the addition of the spring 30. The conductive block 13 is too long and the constraint on the welding wire becomes weak, which may cause the risks of unsmooth and inaccurate wire feeding of the welding wire. To overcome this risk, a wire guide 40 is added on the axis of the body. To better function as a guide for the welding wire, the wire guide 40 should extend as far as the front end of the main body 10. Therefore, the conductive block 13 is also subjected to a retreating process, and the tip of the wire guide 40 is tapered as much as possible. The wire guide 40 may be made of copper, alloy steel, ceramic, or other wear-resistant materials to improve the wear resistance of the wire guide 40. Therefore, after the contact tip is used for a long time, the passage of the welding wire is not enlarged to influence the conveying of the welding wire.

The main body 10 of the embodiments 1, 2, 3 and 4 can be added with the welding wire conduit 40, and the welding wire conduit 40 can be shortened appropriately according to actual needs.

Example 6: as shown in FIG. 6, this embodiment illustrates a fourth form of spring 30 and also adds an insulating sleeve 20 to the contact tip. The spring 30 in this embodiment is "V" shaped, and the spring 30 is composed of an elastic sheet 32 and a support sheet 35. The elastic sheet 32 is closely attached to the conductive block 13, and the support sheet 35 is on the side of the heat insulating jacket 20. The surface of the spring 30 is dimpled or embossed to reduce heat transfer. Each conductive piece 13 is provided with a spring 30, and in order to prevent displacement and rotation of the spring 30, a receiving groove is preferably provided in the heat insulating sleeve 20, and the receiving groove has a size corresponding to the support piece 35, and is used for restraining the support piece 35 in the receiving groove. This example not only shows the fourth type of spring 30, but also adds the sleeve 20. The heat insulating sleeve 20 can reduce the temperature of the main body 10, particularly the conductive block 13, and also reduce the temperature of the spring 30 so that the performance of the spring 30 should not be reduced by the increase in temperature. The performance of the spring 30 is stably exerted, so that the elasticity can be better transmitted to the conductive block 13, and the clamping force of the conductive block 13 to the welding wire can be in an optimal state. Even if a larger current, a higher weld pool temperature, a longer weld seam and a longer continuous welding time are met, the clamping force of the conductive block 13 is not weakened. The conductive block 13 provides maximum material for the abrasion of the welding wire, and the conductive performance is not weakened all the time while the service life of the contact nozzle is maximized.

Without the protection and the elasticity provided by the thermal sleeve 20 and the spring 30, the conductive block 13 can receive heat from a molten pool during welding to rapidly increase the temperature of the conductive block 13, and particularly, the temperature of the conductive block 13 can be higher in a severe welding environment with high current and long duration of single welding. The increase in temperature causes the copper conductive bumps 13 to lose elasticity, and the conductive bumps 13, which have an originally holding force, are opened. The copper conductive block 13 has weak elasticity, and the addition of the spring 30 well makes up for the defect, so that the conductive block 13 not only has good elasticity, but also has excellent conductivity. Therefore, the conductive block 13, the heat insulating sleeve 20 and the spring 30 are organically combined to maximize the performance of the contact tip.

Examples 3, 4, and 5 may also include a heat insulating sleeve 20 mounted in the contact tip. Similarly, the spring 30 can be added to the embodiment 2.

Example 7: as shown in fig. 7, a tapered guide hole 23 is provided at the front end of the heat insulating jacket 20. Because the part of the conductive block 13 for clamping the welding wire is a plane, when the welding wire passes through the welding wire through hole 12 and penetrates out of the conductive block 13, the welding wire is lack of constraint in the direction of the clamping plane of the conductive block 13, and the risk of inaccurate wire outlet of the welding wire is caused. To reduce this risk, a small guide groove may be provided in the middle of the clamping plane of the conductive block 13, on the same axis as the wire via 12. Although the guide groove is formed in the clamping plane of the conductive block 13 to enable the wire to be more accurately discharged, the clamping plane can be rubbed into a small groove when the welding wire is used, the groove can also play a role in restraining the welding wire, and the guide groove is equivalent to wearing the conductive block 13 in advance, so that the service life of the contact nozzle is shortened. This problem is solved if the diameter of the relief hole 22 at the front end of the heat insulating sleeve 20 is made to be the same as the diameter of the welding wire, so that the welding wire is restrained by 360 degrees. The risk of the welding wire not passing through the clearance hole 22 during a replacement of the welding wire or a replacement of the contact tip may result due to the clearance hole 22 being too small. The relief hole 22 is changed to a tapered guide hole 23 in order that the relief hole 22 can also serve to restrain the welding wire and facilitate the passage of the welding wire out of the sleeve 20. The tapered via 23 is a tapered hole with a large diameter near the conductive block 13 and a small diameter on the side of the wire exit. The aperture of the wire outlet side is equal to the diameter of the welding wire, and the conical guide hole 23 plays a role in guiding the welding wire, so that the welding wire can conveniently penetrate out of the heat insulation sleeve 20 and can be well restrained, and the wire outlet of the welding wire is more accurate. In order to make the tapered guide hole 23 have a better function of guiding the welding wire, the length of the tapered guide hole 23 should be properly extended. Since the diameter of the hole on the outgoing side corresponds to the diameter of the welding wire, i.e. the welding wire substantially fills the gap of the hole on the outgoing side, the possibility of welding spatter being incorporated inside the conductive block 13 is prevented.

Another method for improving the accuracy of the wire feeding of the welding wire is shown in fig. 8. A wire guide sleeve 50 is added at the front end of the heat insulation sleeve 20, a wire guide hole 51 is formed in the middle of the wire guide sleeve 50, and the diameter of the wire guide hole 51 is equivalent to that of a welding wire. Before the contact tube is used, the guide wire sleeve 50 is separated from the heat insulation sleeve 20; when in use, the welding wires sequentially penetrate out of the main body 10 and the heat insulation sleeve 20; then, welding wires are used for passing through the wire guide holes 51 of the wire guide sleeve 50; finally, the wire guide sleeve 50 is inserted into the big hole at the front end of the heat insulation sleeve 20 along the welding wire; the wire guiding hole 51 can well restrain the welding wire, and the wire discharging accuracy of the welding wire is guaranteed. The guide wire hole 51 may also be made as a tapered hole to make it easier for the guide wire to be inserted into the guide wire sheath 50. Since the diameter of the wire guide 50 is equal to that of the welding wire, there is almost no gap between the welding wire and the wire guide hole 51, and thus welding spatter cannot enter the inside of the conductive block 13.

According to the principle of fig. 8, before the contact tip is used, the heat insulating sleeve 20 is not installed in the main body 10, and the relief hole 22 of the heat insulating sleeve 20 has a diameter corresponding to that of the welding wire. In use, the contact tip is used by threading the welding wire through the body 10, then threading the welding wire through the relief hole 22 of the sleeve 10, and finally installing the sleeve 20 over the body 10 along the welding wire.

The front section of the conductive block 13 is slightly bent, and the bending angle is changed according to the inclination angle of the conductive block 13 and the diameter of the welding wire, so that a contact part 18 is formed at the front end of the conductive block 13, the contact part 18 increases the contact area between the main body 10 and the welding wire, and the conductivity of the contact tip is further improved. In addition to fig. 7, the shapes of the contact portions 18 are also shown in the above fig. 2, 3, 4, 5, and the like. In order to ensure that the contact portion 18 is sufficiently contacted with the welding wire, the angle of the contact portion 18 must be controlled, and in order to make the angle of the contact portion 18 more precise, a forming opening 131 may be provided at the bent portion of the contact portion 18.

Example 8: as shown in fig. 9, the present embodiment incorporates an insulation pad 60 into the main body 10 and the insulation cover 20. The insulation pad 60 serves to isolate the body from the insulation sleeve 20. The heat insulating mats 60 are classified into two types, axial heat insulating mats and radial heat insulating mats (in the figure, the heat insulating mat parallel to the axis is an axial heat insulating mat, and the heat insulating mat perpendicular to the axis is a radial heat insulating mat). The heat insulating pad 60 is made of heat insulating material such as glass fiber, asbestos, rock wool, aerogel felt, etc., and the surface of the heat insulating pad 60 has concave grains or convex grains, which also serve as heat insulation to minimize the amount of heat transferred from the molten pool to the main body 10.

An insulating pad 60 may be added between the main body 10 and the spring 30, and between the spring 30 and the insulating sheath 20.

Example 9: as shown in fig. 10, the main body 10 has an extension 16 at the front end thereof, the extension 16 extending the wire passing hole 12, and the extended wire passing hole 12 providing a better constraint to the wire. Although the total length of the contact tip is increased in the scheme, the lengths of the contact block 13 and the wire through hole are ensured. The conductive bumps 13 are also used for good elasticity because they are long enough. The springs 30 in this embodiment may be the same as those shown in embodiment 3, or may be separate leaf springs 30, and the shape of the leaf springs 30 is similar to an obtuse angle. The leaf spring 30 is fixed by attaching one side of the leaf spring 30 to the main body 10 and the other side of the leaf spring 30 to the conductive block 13, and then installing the heat insulating sleeve 20, and pressing the leaf spring 30 between the main body 10 and the heat insulating sleeve 20. Alternatively, the leaf spring 30 may be fixed to the main body 10 by using a coupling ring, which is a circular ring, and the leaf spring 30 is first placed at a proper position of the main body 10 and then is mounted in the coupling ring, so that the coupling ring presses the leaf spring 30.

In the embodiment, another form of the tapered guide hole 23 is designed, and the front end of the tapered guide hole 23 is a cylindrical hole, and the rear end is a tapered hole. In addition, the head structure of the heat insulation sleeve 20 is optimized in the form of round corners.

Example 10: as shown in fig. 11, the main body 10 has an escape groove 17, and after the heat insulating jacket 20 is inserted into the main body 10, a portion of the heat insulating jacket 20 corresponding to the escape groove 17 is depressed inward to form a female buckle 24, thereby connecting the main body 10 and the heat insulating jacket 20. The concave buttons 24 may be arranged along the main body 10 in a whole circle, or may be arranged in a point manner by taking the axis of the main body 10 as the center of the circle, and the number of the concave buttons 24 may be one or more. Since the avoiding groove 17 is a groove and also has the function of a heat insulation groove, the number of the concave buttons 24 should be as small as possible in order to achieve a better heat insulation effect. The sleeve 20 may also be debossed in a similar manner where the groove 17 is not avoided, and since the metal is soft, a sharp, hard metal is used to apply sufficient pressure to the sleeve 20 to force the sleeve 20 material into the body 10, as in the case of the debossed connection described above. The female button 24 may be depressed together with the main body 10 when it is processed, so that the connection between the main body 10 and the thermal insulation jacket 20 is more compact. In addition, a concave buckle 24 can be processed at the position of the heat insulation groove 21.

In addition, a more hollow structure should be designed between the main body 10 and the thermal insulation cover 20 as much as possible.

Example 11: as shown in fig. 12, the heat insulating sleeve 20 has a better heat insulating effect by completely fitting the body 10 into the cavity (the rear end of the body 10 is used for connection with a welding torch, and when the contact tip is fitted to the welding torch, the exposed portion is inserted into the welding torch). If an insulation pad 60 is additionally provided between the insulation cover 20 and the main body 10, an appropriate insulation groove or cavity is provided between the insulation groove 20 and the main body 10. The temperature of the main body 10, particularly the conductive block 13, can be maximally lowered.

After the sleeve 20 is installed in the body 10, the rear edge of the sleeve 20 is pressed inward, resulting in a bead 25. If pressure is applied along one circumference of the sleeve 20, a full turn of the bead 25 is obtained; if pressure is applied to only one point, and the crimp 25 has only one point, the material of the body 10 is also indented when the crimp 25 is formed, which not only enables a better connection between the sleeve 20 and the body 10, but also prevents the sleeve 20 from rotating. This method of pressing the back edge of the sleeve 20 inwardly to create the crimp 25 is called crimp connection.

Example 12: the conductive block 13 of the high-conductivity durable contact tip main body 10 is a thickened conductive block, as shown in fig. 13, the thickened conductive block has a width slightly narrower than that of the welding wire, and the welding wire passes through the middle of the two conductive blocks 13 which are symmetrically distributed. The contact surface of the conductive block 13 and the welding wire can be a plane or an arc-shaped guide groove 19, in order to prolong the service life of the contact tip, the guide groove 19 is not easy to be too large, and the arc-shaped strength of the guide groove 19 is consistent with that of the welding wire, so that the contact area of the conductive block 13 and the welding wire is increased, and the conductive block 13 has good conductivity. Because the guide groove 19 is an arc surface consistent with the shape of the welding wire, the guide groove 19 also has the function of positioning the welding wire, and the welding wire cannot randomly deflect due to the conductive block 13 with the structure, so that the welding wire is more accurately discharged. The conductive block 13 is conductive and worn by the welding wire since the width of the conductive block 13 is narrower than the welding wire. When the conductive blocks 13 are worn by the welding wire, the conductive blocks 13 are pressed inwards to reduce the distance between the two conductive blocks 13 to the diameter of the welding wire, and the contact tip can be used continuously, and the process is repeated continuously, so long as the thickness of the conductive blocks 13 is enough, the contact tip can be used continuously. In addition, the conductive blocks 13 can be properly extended to have enough elasticity, and the two conductive blocks 13 can be pressed together to ensure that the conductive blocks 13 have enough clamping force on the welding wire, so that the using effect is better. Of course, the conductive block 13 can also be used with the spring 30, and the conductive block 13 needs to have the flexible conductive piece 14 to reduce the strength of the conductive block 13. The spring 30 is provided with a bump or a pit, so that the contact area between the spring 30 and other parts is reduced as much as possible, and the purpose of limiting heat conduction is achieved.

There are connecting portion 11 and holding tank 15 in main part 10 middle part, and connecting portion are used for being connected with radiation shield 20, and holding tank 15 is used for keeping apart main part 10 and radiation shield 20 to weaken radiation shield 20 and transmit the heat of main part 10, and the radiation shield can use copper to make, also can use other materials to make, and when the material that uses easily glues and splashes, should prevent the processing that splashes to it.

Example 13: as shown in fig. 14, the conductive piece 13 of the main body 10 is composed of a conductive piece root portion 132, an outer protrusion 133 and a contact portion 18. The gap between the two conductive pieces 13 is slightly smaller than the diameter of the wire through hole 12, and the gap between the two protrusions 133 is larger than the diameter of the wire through hole. The guide groove 19 is formed on the contact portion 18 or penetrates the entire conductive block 13. The outer protrusion 133 provides elasticity for the contact part 18, the guide groove 19 is in contact with the welding wire, the contact area of the welding wire and the conductive block 13 is increased by the guide groove 19, the conductivity of the contact tip is guaranteed, the guide groove 19 has a positioning effect on the welding wire, and the wire is discharged more accurately.

Example 14: as shown in fig. 15, in the present embodiment, the thermal insulation sleeve 20 is coupled to the main body 10 by using a coupling pin 70, and the coupling pin 70 may have various forms, such as a smooth pin, a knurled surface, a screw thread, and a threaded coupling pin 70. To facilitate the screwing of the connecting pin 70 into the body 10, the head of the threaded connecting pin 70 has a "I" or "cross" shaped recess, and may also be a socket head. The connecting pin 70 may have a cylindrical shape or a T-shape. Although there are many ways of connecting the contact tip to the welding torch, the most used contact tip is threaded. In order to easily mount the contact tip on the welding gun during use or detach the contact tip from the welding gun during replacement, a wrench surface 26 is required to be provided on the contact tip, and the wrench surface 26 may be provided on the main body 10 or on the heat insulating sleeve 20. However, in the case of a short contact tip, such as a model number of bindel 15AK, 25KD, etc., there is not enough space on the main body 10, and the wrench face 26 can only be disposed on the heat insulating sleeve, even if the contact tip has a length enough to dispose the rear plate face 26 on the main body 10, the wrench face 26 is more suitable to be disposed on the heat insulating sleeve 26 in view of convenience of use. The thermal sleeve 20 is fixed to the main body 10 by the connecting pin 70, so that the thermal sleeve 20 is prevented from falling off, and the thermal sleeve 20 is prevented from rotating when the contact tip is attached and detached. When the wrench surface 26 is not provided with enough space in the main body 10 and the heat insulation sleeve 20, knurling can be processed on the outer surface to increase the roughness and friction force, so that the contact tip can be conveniently mounted or dismounted by a tool.

The distance between the two conductive blocks 13 is smaller than that of the welding wire through hole 12, the guide groove 19 is a part of the welding wire through hole 12, and the spring 30 presses the conductive blocks 13 together and provides elasticity for the conductive blocks. After the welding wire passes through the conductive block 13, the contact surface with the welding wire is naturally not few because the guide groove is a part of the welding wire through hole 12, and the scheme has the advantage that the conductive block 13 can be in large-area contact with the welding wire without specially processing the contact part 18, so that the conductivity of the contact nozzle is improved. Compared with embodiment 13, the conductive piece 13 does not have to have an elastic force intentionally, the conductive piece 13 loses the elastic force in a continuous high-temperature environment, the elastic force is provided by the spring 30, the embodiment has no outward protrusion 133, and the advantage of simple structure is provided.

In the present embodiment, the inner cavity structure of the heat insulating jacket 20 is adjusted so as to be able to utilize the performance of each component.

Example 15: in the extreme case where the wrench face 26 is not available, as shown in fig. 16, a rotation hole 171 may be provided for attaching or detaching the contact tip, and the rotation hole may be provided in the main body 10 or in the heat insulating sleeve 20. When the heat insulating sleeve 20 has a rotation hole, a connection pin 70 is provided between the heat insulating sleeve 20 and the main body 10, and when the spring 30 is provided at the position of the connection pin 70, a hole is formed in the spring 30 so that the connection pin 70 can be inserted into the main body 10.

The guide wire sleeve 50 may also be T-shaped, and the hole in the center of the guide wire sleeve 50 may be tapered instead of cylindrical. The wire guide sleeve 50 and the heat insulation sleeve 20 can be connected in an interference manner, and can also be connected in a threaded manner.

The conductive block 13 has a uniform cross-sectional structure.

Example 16: as shown in fig. 17, the spring 30 of the present embodiment is configured as a coil spring, which is, as its name implies, a coil spring having a coil number of about 0.7 to 1.8, and is also similar to a spring washer. The conductive block 13 has a positioning groove 135, and the spring 30 is located in the positioning groove 135 to prevent the spring 30 from falling off the conductive block 13. Similarly, as in the measure of embodiment 4, when the gap between the conductive block 13 and the heat insulating sleeve 20 is smaller than the outer diameter of the coil spring, the effect of preventing the spring 30 from falling off from the conductive block 13 can be achieved. Also, the coil spring needs to be made of a high temperature resistant spring material to ensure that the spring 30 still has sufficient stiffness in a high temperature environment so that it does not loosen during the welding process. The coil spring has elasticity, so can put into constant head tank 135 after expanding it, and the hardness and the diameter of coil spring are its key that has elasticity size, and the hardness and the diameter of control coil spring make elasticity just in time can be pressed together upper and lower two conducting blocks 13, and during the welding, the welding wire passes through from conducting block 30, struts spring 30, and spring 30 forms an inward pressure to conducting block 13 this moment, and conducting block 13 just can keep good contact with welding wire 20, and along with conducting block 13 gradually is worn and torn by the welding wire, the coil spring also can slowly inwards draw in. The force of the coil spring pressing the upper and lower conductive blocks 13 together is not easy to be too large, because the resistance of the wire during welding is too increased, and the risk of unsmooth wire discharge or even wire discharge failure is generated. In order to ensure that the contact tip can conduct enough electric energy to the welding wire, the section of the soft conducting strip 14 cannot be reduced to reduce the rigidity of the conducting block 13, the rigidity of the conducting block 13 is reduced by adopting a method of prolonging the conducting block 13 as much as possible, the length of the contact tip of some types in welding production is only 25 mm or even shorter, and the length of the conducting block 13 is limited, the solution is that the main body 10 is divided into a body 116 and a core 134, so that the root 141 of the conducting block 13 can move backwards, the length of the conducting block 13 can be increased to the maximum extent by using the short-type contact tip, the length of the conducting block 13 is increased, the rigidity is reduced, a coil spring with smaller elasticity can be used, and the smoothness of wire discharging of the welding wire is ensured. The body 116 and the core body 134 are in interference connection, so that smooth electric energy transmission is ensured. If necessary, a flange 137 is formed at the tail of the core 134 to prevent the core 134 from falling off. The body 116 and the core 134 are firmly and sufficiently connected to prevent the core from falling off, and the sufficient connection is to ensure effective transmission of electric energy. Also commonly used are connections that are sufficiently strong and secure, such as screw connections, welds, etc.

Forming the flexible conductor sheet 14 as a flexible structure composed of a plurality of filaments or sheets is also a method of reducing the rigidity of the conductive block 13.

When the contact tip is subjected to heat radiation from the arc during welding, the contact piece 13 is softened by increasing the temperature thereof, and the elastic force of the spring 30 is appropriately reduced.

Example 17: as shown in fig. 18, the present embodiment provides a coil spring (spring 30) with another structure, and fig. 17 shows a technical solution that the head and the tail of the coil spring are all on the boss at the front end of the conductive block 13, and the length of the coil spring is shorter (the pitch of the coil spring is smaller). In this embodiment, the coil spring is long (the pitch is large), one end of the coil spring is attached to the boss at the front end of the conductive block 13, and the other end is attached to the flexible conductive piece 14. Compared with the technical scheme of fig. 17, the acting points of the coil spring in the embodiment are more dispersed, the former is concentrated at the front end, only one part of the latter is at the front end, the acting point of the other part is closer to the back, and an angle is formed after the conductive blocks 13 are pressed together, so that the effect of adjusting the elastic force can be achieved.

Another method for adjusting the elastic force of the spring 30 (not limited to coil springs, but also including the above springs) is to move the force point of the spring 30 applying the elastic force to the conductive block 13 from the head of the conductive block 13 backwards, because the spring 30 forms an angle after being folded, when the welding wire passes through the middle of the conductive block 13 to spread the conductive block 13, the amount of expansion of the spring 13 is smaller the farther the force point of the spring 30 is, and similarly, when the conductive block 13 is closed after being worn, the amount of contraction of the spring 30 located farther the force point is smaller.

In order to reduce the frictional resistance between the spring 30 and the conductive block 13, the contact area between the spring 30 and the conductive block should be reduced, and in addition, the frictional force between the spring 30 and the conductive block 13 should be reduced by increasing the surface roughness, increasing the hardness, and the like.

In this embodiment, the body 116 is threadably coupled to the core 134. For long contact tips, the heat shield 20 may be screwed to the body 10 because there is sufficient space for the wrench face 26 to be located on the body 10, although there are many ways to attach the contact tip to the welding gun, the threaded connection is most commonly used. When using a threaded connection, since the main body 10 and the sleeve 20 are also threaded, if the wrench face 26 is on the sleeve 20, the contact tip may not be screwed or removed, and this problem does not occur when the wrench face 26 is placed on the main body 10 (or the main body 116).

Fig. 18 shows an elongated coil spring whose head is inclined at a large angle to the front end of the nozzle, in which case the coil spring does not fall off without the positioning groove 135.

Example 18: this embodiment divides the main body 10 into two parts, one part is the body 116 and the other part is the conductor 136, as shown in fig. 19. The conductor 136 is made of a plurality of thin copper sheets or thin copper wires, in order to make the conductive block 13 soft and have enough conductors as welding wires to conduct electricity, if necessary, the two ends of the conductive block 13 are compacted or the thin copper sheets and the thin copper wires at the two ends are welded together to improve the stability, the middle section is not welded to enable the middle section to have good flexibility, in addition, the front end of the thin copper sheet used for manufacturing the conductor 136 is folded backwards 1-3 times to be completely attached to the thin copper sheet so as to achieve the purpose of thickening the front end of the conductor 136, the front end 134 is thicker when the number of times of folding backwards is more, and the structure of the conductor 136 is similar to the structure formed by combining the 14 soft guide sheets and the conductive block 13 in embodiment 3. The conductor 136 is fixed to the body 116 and the conductive block 13 is fixed to the spring 30.

Example 19: fig. 20 is a structural view of the main body 10 having the flexible conductive pieces 14 on part of the conductive pieces 13, and straight slits are formed between the conductive pieces 13. The cross-sectional size without the flexible conductive piece 14 can be made thicker in order to make the conductive block 13 have enough conductor to ensure the transmission of electric energy, so that the cross-sectional size of the flexible conductive piece 14 can be made smaller and made more flexible, the elastic force of the spring 30 is only applied to the conductive block 13 with the flexible conductive piece 14, the elastic force makes the conductive block 13 press the welding wire and make the welding wire contact with the conductive block 13 having enough conductor on the other side, so that sufficient electric energy is conducted to the welding wire. Since the conductive block 13 having the flexible conductive piece 14 is more flexible, the spring 30 having a smaller elastic force can be used. The elasticity of the spring 30 is reduced, the resistance of the contact block 13 to the welding wire is further reduced, the wire discharging of the welding wire is smoother, and the scheme is particularly suitable for contact tips with too short lengths. Because the section size of the conductive block 13 without the flexible conductive piece 14 is larger, the rigidity is also larger, and the elastic force of the spring 30 is smaller, the elastic force of the spring 30 is only applied to the conductive block 13 with the flexible conductive piece 14.

Example 20: fig. 21 is a structural view of the core 134 having oblique slits between the conductive bumps 13. The oblique gap reduces the cross-sectional size of the root portion of the conductive block 13 and increases the size of the other end. Also, in order to make the conductive block 13 have enough conductor to conduct electricity to the welding wire, the cross-sectional size of the conductive block 13 can be made larger to compensate for the loss of the conductor on the other side. The small-section side conducting block 13 can be made to be softer by controlling the depth and the angle of the oblique gap well, so that a soft conducting sheet 14 is formed, the elastic force of the spring 30 is only applied to the soft conducting block 13, the softer conducting block 13 can be suitable for the spring 30 with smaller elastic force, and the resistance of the welding wire brought by the spring 30 is reduced to the maximum extent on the premise of fully ensuring the conductivity of the contact tip. Therefore, the optimal comprehensive performance of the contact nozzle, namely the best conductivity, the minimum welding wire resistance and the longest service life, can be exerted. When the elastic force is applied to the single-side conductive block 13, the friction force between the spring 30 and the conductive block 13 is smaller than that required to be applied to the conductive blocks 13 on both sides.

Example 21: in order to simplify the structure of the product and ensure that the same invention effect can be achieved, the conductive block on the side with the flexible conducting strip 14 in the embodiment 19 and the embodiment 20 can be removed, only the conductive block 125 on the side with the large section size is reserved, the elastic force of the spring 30 is directly applied to the welding wire, so that the welding wire and the conductive block 125 with the large section form good contact, and the conductive block 125 with the large section conducts electricity to the welding wire.

According to the technical scheme that the spring directly applies elasticity to the welding wire, a new contact tip structure can be developed, as shown in fig. 22. The front end of the main body 10 is provided with a spring groove, the length of the spring groove is about 2-25 mm, the width of the spring groove is about 1-10 mm, and the depth of the spring groove completely reaches the bottom of the welding wire through hole, namely, the spring groove needs to penetrate through the aperture of the whole welding wire through hole, so that the service life of the contact tip can be prolonged to the maximum extent. The spring 30 is a C-shaped plate spring, the width of the spring 30 is equal to the width of the spring groove, the thickness of the spring 30 is determined by the elastic force required by the spring 30, and the length, width, height and thickness of the spring 30 can be controlled by adjusting the length, width, height and thickness of the spring 30 when determining the elastic force of the spring 30. The anti-drop cover 80 is made of anti-splash material and is formed by rolling a plate into a cylinder, the two ends of the plate are butted, and the structure can enlarge the outer diameter of the anti-drop cover 80 so as to be placed in the main body 10. Of course, the structure of the main body 10 can be modified slightly, so that the anti-falling cover 80 is connected to the main body 10 in a fully enclosed structure, for example, the outer diameter of the rear end of the main body 10 is matched with the inner diameter of the anti-falling cover 80, the outer diameter of the front end of the main body 10 is larger than the outer diameter of the anti-falling cover 80, and the anti-falling cover 80 is inserted from the rear end of the main body 10, which has the advantage that the anti-falling cover 80 cannot fall off. The anti-slip cover 80 may be configured as the heat insulating jacket 20. If the separation-preventing cover 80 is inserted from the front end of the main body 10, it is necessary to prevent the separation-preventing cover 80 from being separated from the main body 10 by means of interference fit, indentation, screw thread, separation-preventing pin, and the like. The structure of the spring 30 is not limited to the "C" shape, and the structure of the above embodiments may be used, and even a coil spring and a "Z" type spring may be used, and when the spring 30 of other structures is used, the structure of the main body 10 may be modified as necessary.

In order to maximize the service life of the contact tip without considering the positional deviation of the welding wire, the width of the spring (30) is designed to be slightly smaller than the welding wire so that the welding wire can always maintain good contact with the body (10) no matter how the body (10) is worn by the welding wire, and the contact tip can be used until the material of the body (10) is completely worn out by the welding wire. Correspondingly, the width of the main body 10 at the other side corresponding to the spring groove is made small, so that the width of the main body 10 at the position is slightly smaller than the diameter of the welding wire, and under the condition that the width of the spring 30 cannot be slightly smaller than the diameter of the welding wire, when the material of the main body 10 is continuously abraded by the welding wire, the spring 30 cannot be collided with the main body 10, so that the welding wire is always kept in good contact with the main body 10 until the material of the main body 10 is completely abraded by the welding wire.

Example 22: as shown in fig. 23, several different configurations of the tail portion of the highly conductive durable solder contact tip are illustrated. The contact tip tail is connected with a welding gun, electric energy from the welding machine is obtained through the connection with the welding gun, and the contact tip tail is provided with an internal thread 111, an external thread 112, a T-shaped 113, a taper 114 and a straightening part 115. The extension part extends into the welding gun, so that the welding wire can be straightened to a certain extent under the condition that the length of the exposed part of the contact tip is not extended, meanwhile, the contact area of the contact tip and the welding wire is increased, and the improvement of the conductivity is facilitated to a certain extent.

Fig. 24 shows a structure of a typical spring, and fig. 25 shows a sheet-type obtuse-angle structure, and in a sectional view of the drawing, the typical spring and the sheet-type obtuse-angle structure spring are not easily distinguished, so that the complete structure of two different springs is shown by fig. 24 and 25.

Fig. 26 is another embodiment of a high conductivity durable welding contact tip having a wrench face body, which is an elongated contact tip.

The service life and performance of the high conductivity and durable welding tip, particularly the body 10, is further enhanced by aging the tip to improve its strength, wear resistance and conductivity.

In order to improve the conductivity of the contact tip, the length of the contact portion 18 should be increased, or the contact area between the guide groove 19 and the welding wire should be increased, and in addition, the surface roughness of the contact surface between the contact tip and the welding wire should be increased to make the contact surface smooth like a mirror.

The above description is only exemplary of the invention, and is not intended to limit the scope of the invention to the particular embodiments described, but rather, the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

According to the technical teaching given by the embodiments, the embodiments can be replaced or combined, so that a new embodiment is obtained. Since the new embodiments can be freely replaced or combined with the disclosed embodiments, they are not listed and are specifically described herein.

Claims

The high-conductivity durable welding contact nozzle and the method are characterized in that: the contact nozzle consists of a main body (10) and a heat insulation sleeve (20), a cavity is arranged in the heat insulation sleeve (20) and is used for accommodating the main body (10), the cavity is connected with a yielding hole (22) at the front end of the heat insulation sleeve (20),

a welding wire through hole (12) is formed in the main body (10), the main body (10) is penetrated through by the welding wire through hole (12), and the hole of the welding wire through hole (12) is an equal-diameter hole; or the inside of the main body (10) is a hole with different diameters, the front section of the main body (10) is of a thin-wall structure, and the diameter of the hole with different diameters at the welding wire outlet at the front end of the main body (10) is smaller than the diameter of the hole in other areas; or the rear end of the main body (10) is provided with a welding wire through hole (12), the front end is provided with a conductive block (13), the conductive block (13) clamps the welding wire and is worn by the welding wire,

the welding wire through hole (12) in the main body (10) and the avoidance hole (22) of the heat insulation sleeve (20) are on the same axis.
The high-conductivity durable welding contact nozzle and the method are characterized in that: the contact nozzle consists of a main body (10) and a spring (30), wherein the spring (30) is arranged at the front end of the main body (10), the main body (10) is provided with a welding wire through hole (12) and a conductive block (13), the spring (30) provides elasticity for the conductive block (13), and the conductive block (13) clamps the welding wire and is worn by the welding wire;

or, the contact nozzle consists of a main body (10), a spring (30) and a heat insulation sleeve (20), a cavity is arranged in the heat insulation sleeve (20) and used for accommodating the main body (10) and the spring (30), the cavity is connected with an avoiding hole (22) in the front end of the heat insulation sleeve (20), a welding wire guide pipe (40) and the avoiding hole (22) of the heat insulation sleeve (20) are on the same axis, the spring (30) provides elasticity for a conductive block (13), and the conductive block (13) clamps the welding wire and allows the welding wire to be worn.
The high-conductivity durable welding contact nozzle and the method are characterized in that: the contact nozzle consists of a main body (10) and a welding wire guide pipe (40), the welding wire guide pipe (40) is arranged inside the main body (10), the welding wire passes through the welding wire guide pipe (40) and is sent to the head of the main body (10), the front end of the main body (10) is provided with a conductive block (13), and the conductive block (13) clamps the welding wire and is worn by the welding wire; or the inside of the main body (10) is a hole with different diameters, and the diameter of the hole with different diameters at the welding wire outlet at the front end of the main body (10) is smaller than the diameter of the hole in other areas;

or the contact nozzle consists of a main body (10), a welding wire guide pipe (40) and a heat insulation sleeve (20), wherein a cavity is formed in the heat insulation sleeve (20) and used for accommodating the main body (10), the cavity is connected with an avoiding hole (22) in the front end of the heat insulation sleeve (20), and the welding wire guide pipe (40) and the avoiding hole (22) of the heat insulation sleeve (20) are on the same axis.
The high-conductivity durable welding contact nozzle and the method are characterized in that: the contact tip consists of a main body (10), a spring (30) and a welding wire guide pipe (40), wherein the spring (30) is arranged at the front end of the main body (10), the welding wire guide pipe (40) is arranged inside the main body (10), the welding wire passes through the welding wire guide pipe (40) and is sent to the head of the main body (10), a welding wire through hole (12) is formed in the rear end of the main body (10), a conductive block (13) is arranged at the front end of the main body, the spring (30) provides elasticity for the conductive block (13), and the conductive block (13) clamps the welding wire and is used for abrasion of the welding wire;

or, the contact nozzle consists of a main body (10), a spring (30), a welding wire guide pipe (40) and a heat insulation sleeve (20), a cavity is formed in the heat insulation sleeve (20) and used for containing the main body (10) and the spring (30), the cavity is connected with an avoiding hole (22) in the front end of the heat insulation sleeve (20), the welding wire guide pipe (40) and the avoiding hole (22) of the heat insulation sleeve (20) are on the same axis, the spring (30) provides elasticity for a conductive block (13), and the conductive block (13) clamps the welding wire and enables the welding wire to be worn.
The high-conductivity durable welding contact nozzle and the method are characterized in that: the contact tube comprises a main body (10), a spring (30) and an anti-falling sleeve (80), wherein the front end of the main body (10) is provided with a spring groove for mounting the spring (30), and the anti-falling sleeve (80) is used for preventing the spring (30) from falling off;

the spring (30) is of a C-shaped structure;

or the spring (30) is in a V-shaped structure;

or the spring (30) is in a Z-shaped structure;

or the spring (30) is of a sheet obtuse angle structure;

or the spring (30) is of a spiral structure;

the width of the spring (30) is larger than the diameter of the welding wire;

or the width of the spring (30) is smaller than the diameter of the welding wire;

the anti-drop cover (80) is a butt-jointed cylindrical structure;

or the anti-drop cover (80) is a closed cylindrical structure;

or the anti-drop cover (80) is a structure of the heat insulation sleeve (20);

the corresponding side of the spring groove of the main body (10) is of a solid structure;

or the width of the corresponding side of the spring groove of the main body (10) is smaller than that of the welding wire;

the body (10) is provided with a wrench surface (26);

or the body (10) is provided with a wrench surface (26);

or the body (10) is subjected to aging treatment.
The welding contact tip and method of claim 1, 2, 3, 4, wherein: the main body (10) is provided with a connecting part (11);

or the main body (10) is provided with an accommodating groove (15) with an elastic rib (33);

or the main body (10) is provided with an extension part (16);

or the main body (10) is provided with an avoiding groove (17);

or the main body (10) is provided with a wrench surface (26) or knurl for mounting and dismounting the contact tip;

or the cross section of the main body (10) is circular, oval, racetrack-shaped or polygonal;

or the main body (10) is provided with a heat insulation groove (21) or a heat dissipation groove;

or the main body (10) is provided with a rotating hole (171);

or the main body (10) is composed of a body (116) and a conductor (136); the conductor (136) is integrally made of a plurality of thin copper sheets or thin copper wires, and two ends of the conductive block (13) are compacted or welded; the front end of the thin copper sheet for manufacturing the electric conductor (136) is folded backwards 1-3 times;

or the main body (10) consists of a body (116) and a core body (134); the body (116) and the core body (134) are firmly and sufficiently connected; the tail part of the core body (134) is provided with a flanging (137);

or the tail part of the main body (10) is provided with an internal thread (111), an external thread (112), a T-shaped (113), a conical shape (114) or a straightening part (115);

or the conductive block (23) on one side of the main body (10) is provided with the flexible conductive sheet (14), and the other side is not provided with the flexible conductive sheet (14);

or the gap between the conductive blocks (13) on the main body (10) is an oblique gap;

or the conducting block (23) at one side of the core body (134) is provided with the flexible conducting sheet (14), and the other side is not provided with the flexible conducting sheet (14);

or the gap between the conductive blocks (13) on the core body (1136) is an oblique gap;

or only one side of the main body (10) is provided with a conductive block (13);

or only one side of the core body (134) is provided with the conductive block (13).
The welding contact tip and method of claim 1, 2, 3, 4, wherein: the conductive block (13) is of a structure with a uniform cross section; or the rear end of the conductive block (13) is provided with a flexible conductive sheet (14), and the section of the flexible conductive sheet (14) is smaller than the sections of other parts of the conductive block (13); or the soft guide sheet (14) consists of a plurality of thin copper sheets and thin copper wires; when the soft conducting sheet consists of a thin copper sheet or a thin copper wire, the conducting block needs to be fixed on the spring (30);

or the conducting block (13) is provided with a positioning groove (135) for placing the arc rib (34) and the coil spring;

or the middle section or the rear section of the conductive block (13) is a soft structure consisting of a plurality of thin copper wires or thin copper sheets, the front section of the conductive block (13) is fixed on an elastic sheet (32) or an arc rib (34) of the spring (30) in a fastening mode, an interference mode, a pin mode or a welding mode;

or the conductive block (13) is provided with a forming opening (131);

or the conductive block (13) is provided with a convex part (133);

or the main body (10) is internally provided with a welding wire guide pipe (40), and the conducting block (13) is subjected to avoidance treatment in order to enable the welding wire guide pipe (40) to extend to the front end of the main body as much as possible;

or the surface of the conductive block (13) contacting with the welding wire is provided with a guide groove (19);

or the front section of the conductive block (13) is provided with a contact part (18);

the conductive block (13) of the present claim comprises a conductive block (13) on the body (10), a conductive block (13) on the core body (134), and a conductive block (13) on the conductive body (136).
The welding contact tip and method of claim 1, 2, 3, 4, wherein: the heat insulation sleeve (20) is provided with a heat insulation groove (21) or a heat dissipation groove;

or the heat insulation sleeve (20) is internally provided with a groove for accommodating the support sheet (35);

or the front end of the heat insulation sleeve (20) is provided with a conical guide hole (23), the conical guide hole (23) is of a conical structure, or the front end of the conical guide hole (23) is a cylindrical hole and the rear end is a conical hole;

or the head of the heat insulation sleeve (20) is in a round angle structure;

or the avoidance hole (22) is provided with a thread;

or the heat insulation sleeve (20) is provided with a concave buckle (24);

or the heat insulation sleeve (20) is provided with a curled edge (25);

or the front end of the heat insulation sleeve (20) is provided with a wire guide sleeve (50), and the wire guide sleeve (50) is provided with a wire guide hole (51); the guide wire sleeve (50) is cylindrical or T-shaped, and the guide wire hole (51) is cylindrical or conical; the guide wire sleeve (50) is provided with threads or is not provided with threads;

or the heat insulation sleeve (20) is provided with a wrench surface (26) for mounting and dismounting the contact tip or knurling.

Or the heat insulation sleeve (20) is subjected to anti-splashing treatment;

or the cross section of the heat insulation sleeve (20) is circular, oval, racetrack-shaped or polygonal;

or the heat insulation sleeve (20) is provided with a rotating hole (171);

or the heat insulation sleeve (20) is provided with a wrench face (26) or a knurl;

or the heat insulation sleeve (20) is connected with the main body (10) through a connecting pin (70); the connecting pin (70) is cylindrical or T-shaped; or the cylinder is provided with screw threads, and the head part is provided with a groove shaped like a Chinese character 'yi' or 'cross'; correspondingly, the heat insulation sleeve (20) and the main body (10) are provided with holes and threads for matching the connecting pin (70);

or the heat insulation sleeve (20) and the main body (10) are connected in a threaded connection, an interference connection, a pin connection, a press-concave connection, a welding and a crimping connection mode;

or the heat insulation sleeve (20) and the main body (10) are not specially installed in place, and a certain gap is reserved.
The welding contact tip and method of claim 1, 2, 3, 4, wherein: the spring (30) consists of a fixed ring (31) and an elastic sheet (32), the elastic sheet (32) is tightly attached to the conductive block (13), and the fixed ring (31) fixes the spring (30) on the main body (10); or the spring (30) consists of an elastic rib (33) and an arc rib (34), the arc rib (34) is tightly attached to the conductive block (13), and the spring (30) is fixed on the main body (10); or the spring (30) consists of a support sheet (35) and an elastic sheet (32), the support sheet (35) is supported on the inner wall of the heat insulation sleeve (20), and the elastic sheet (32) is tightly attached to the conductive block (13); or the spring (30) is of an obtuse-angle sheet structure, one end of the spring (30) is tightly attached to the conductive block (13), and the other end of the spring is fixed on the main body (10) through a connecting ring; or the spring (30) is a coil spring which is arranged on the conductive block (13);

or the spring (30) is provided with concave lines or convex lines;

or the spring (30) is used for anti-splashing treatment;

or the section of the fixing ring (31) of the spring (30) is circular, oval, racetrack-shaped or polygonal;

or the spring (30) is connected with the main body (10) in a threaded connection, interference connection, pin connection, indentation connection or welding mode;

or the diameters of the arc ribs (34) and the coil springs in the spring (30) are larger than the distance between the conductive block (13) and the heat insulation sleeve (20);

or the pitch of the coil spring is not limited;

or the acting point of the spring (30) is at any position of the conductive block (13);

or the contact surface between the spring (30) and the conductive block (13) is reduced, the surface smoothness is increased, and the friction resistance is reduced by improving the surface hardness.
The welding contact tip and method of claim 1, 2, 3, 4, wherein: a heat insulation pad (60) is arranged between the main body (10) and the heat insulation sleeve (20);

or a heat insulation pad (60) is arranged between the main body (10) and the spring (30);

or a heat insulation pad (60) is arranged between the spring (30) and the heat insulation sleeve (20);

the heat insulation pad (60) is an axial heat insulation pad or a radial heat insulation pad;

or the heat insulation pad (60) is provided with concave grains or convex grains;

or aging the body (10), the core body (134) and the conductor (136).