CN114406421A

CN114406421A - Easily-adjustable durable welding contact nozzle and method

Info

Publication number: CN114406421A
Application number: CN202010538676.1A
Authority: CN
Inventors: 何强; 何珍; 汪年成
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-13
Filing date: 2020-06-13
Publication date: 2022-04-29
Also published as: WO2021249413A1

Abstract

The easily-adjusted durable welding contact nozzle and the method are composed of a main body (100) and an adjusting sleeve (200), wherein the rear end of the main body (100) is provided with a connecting part (105), a cylindrical hole for a welding wire to pass through is formed in the main body, the front end of the main body is provided with a conductive block (125), gaps are formed among the conductive blocks (125), the adjusting sleeve (200) is provided with a cavity for accommodating the conductive block (125), the front end of the adjusting sleeve (200) is provided with an adjusting hole (210) and a guide hole (220), and the cylindrical hole and the guide hole (220) of the main body (100) are positioned on the same axis. The conductive block (125) or the adjusting hole (210) is provided with taper for changing the direction of force, the main body thread (115) is meshed with the adjusting sleeve thread (205), the adjusting sleeve (200) and the main body (100) move relatively, namely, the main body (100) or the adjusting sleeve (200) is screwed to enable the conductive block (125) and the adjusting hole (210) to move oppositely, and external force is applied to the conductive block (125) to enable the conductive block (125) to be folded inwards. The force generated by the compression of the spring (400) can be used to gather the conductive block (125).

Description

Easily-adjustable durable welding contact nozzle and method

Technical Field

The invention belongs to the technical field of contact tips for welding, and the contact tip adopts an adjustable structure, so that the abrasion of a welding wire on the contact tip can be supplemented in time, the welding wire and the contact tip can be kept in good contact all the time, the current is ensured not to be attenuated due to the abrasion of the contact tip during welding, and the welding quality is improved. And because more material is provided for the welding wire to wear, the service life of the contact tube is also prolonged. The invention discloses a structure of a welding contact tube which is easy to adjust and durable, and also discloses a method for easily adjusting the contact tube and prolonging the service life of the contact tube.

Background

The contact tip used for gas metal arc welding has various brands and different specifications, but the structure is largely the same or different, and a material with excellent conductivity is selected, a hole with the diameter equivalent to that of a welding wire is processed in the middle, a section of connecting thread with a welding gun is processed at the rear end, and the front end is processed into a cone, so that the contact tip for gas metal arc welding is formed. This structure has been used for a whole 70 years, and although there are many innovations on contact tips made by technicians in the welding field, there are many patents for contact tips, which have no valuable innovation point, but for various reasons, these innovations have not been transformed into a real product with practical value that can be accepted and used by the general industry. For 70 years, a plurality of new technologies are continuously developed for a welding machine of gas metal arc welding, the former is a silicon controlled welding machine, the former is an inverter welding machine, the former adopts short circuit transition and the former is pulse transition, the welding wire is a solid welding wire, the later flux-cored welding wire appears, and the later metal flux-cored welding wire also appears. Although there are many innovations in the field of contact tips, there are few inventions that are truly in widespread use. The contact tip used by us was still in a consistent pattern for 70 years. This is reflected from a side, and the innovation of the conventional contact tube is a small component which is unobtrusive and simple in structure, but is not easy to create by a good technology which can improve the performance (such as prolonging the service life and improving the conductivity) of the conventional contact tube, is convenient to use and low in cost, and can be generally accepted in the industry.

Why is the traditional contact tip invented for 70 years, which is not good? In the above, the conventional contact tip has a hole in the middle, which is slightly larger than the diameter of the welding wire, and the welding wire passes through the hole, is melted by the arc, and then enters the molten pool. When the contact tip is just used, the aperture of the hole is only slightly larger than the diameter of the welding wire, so that the welding wire can be ensured to be fully contacted with the contact tip, and the conductivity of electric energy is good. During welding, the welding wire continuously passes through the contact tube, the welding wire continuously rubs with the wall of the contact tube, and the hole becomes larger as the welding time is longer. The larger the hole, the less sufficient the welding wire is in contact with the contact tip, the poorer the conductivity of the electrical energy is, and the poorer the welding quality is. The structure of the traditional contact tube has two major disadvantages, namely, the conductivity of the contact tube begins to weaken from the beginning of use, and the contact tube needs to be frequently replaced, so that the service life is short. The society advances, the requirement on the welding quality of products is increasingly improved, and the production cost of enterprises is invisibly increased due to frequent replacement of the contact tube.

The inventor applies for a patent of 'durable welding contact tip easy to process and a manufacturing method thereof' (later, the patent is changed into 'high-temperature-resistant long-life welding contact tip and a manufacturing method and a using method thereof') in 2018, the patent arranges two symmetrical conductive blocks at the front end of the contact tip, a gap is arranged between the two conductive blocks, the size of the gap is basically consistent with that of a welding wire, and the welding wire penetrates through the middle of the two conductive blocks to conduct electricity for the welding wire. The distance between the two conductive blocks is accurately allocated, so that the welding wire does not shake in the middle of the conductive blocks, the conductive blocks are in more sufficient contact with the welding wire, and the conductivity of the contact tip is improved. The cross-sectional size of the conductive block is controlled within a proper range so that the conductive block has sufficient strength to ensure that the conductive block is not deformed in a high-temperature environment during welding. When the welding wire wears the conductive blocks and shakes, the conductive blocks are pressed inwards to enable the welding wire to be in good contact with the conductive blocks, the welding wire does not shake, the conductive nozzle is restored to a good conductive state, and the process is repeated for multiple times until the two conductive blocks are attached. Compared with other contact tip patents, the contact block in the invention has enough strength and does not deform in high-temperature radiation of electric arc, thereby ensuring the stability of products. The welding wire does not shake between the conductive blocks, so that the welding wire can be fully contacted with the contact tip, and the conductivity of the contact tip is improved. The contact tube can be repeatedly used, and the service life of the contact tube is prolonged. But the invention not only improves the conductivity of the contact tube, but also prolongs the service life of the contact tube, has simple structure and low cost, and has the condition of large-scale popularization and application. However, there are some disadvantages, and when the conductive block is worn, the conductive block needs to be pressed inwards by a tool such as a pliers, and the contact tip can be used continuously. In actual operation, the conducting block needs to be pressed inwards to a large extent, the resilience is large, and due to manual operation, the factors are not well controlled, the inward pressing is small, the welding wire still shakes, and the conducting performance cannot reach the optimal state. When more internal pressure is applied, the welding wire is clamped too tightly by the conductive block and cannot be discharged. And the splashing generated by welding is easy to splash into the gap between the conductive blocks, and if the conductive blocks are not cleaned, certain obstruction can be caused when the conductive blocks are folded inwards. In addition, the splashing can be accumulated on the gap in a large quantity, the flowing of the protective gas is influenced, the protective gas is not protected by the molten pool, and pores can be generated. Therefore, the patent has some technical breakthroughs, but has some defects in the beauty, and needs to be continuously optimized and innovated.

The invention creation is originally a continuous improvement process, and the invention creation has vitality only by finding out problems in practice and solving the problems in many ways, and the invention creation can be converted into actual productivity to add power to the development of society.

Disclosure of Invention

In order to facilitate the use of the contact tube and to make the adjustment of the distance between the upper and lower conductive blocks easier and more accurate, the applicant has designed a contact tube capable of randomly adjusting the conductive blocks and also provides a method for adjusting the distance between the conductive blocks. The length of the conductive block is properly prolonged, the front end of the conductive block is of a taper structure, an adjusting sleeve is additionally arranged, the adjusting sleeve is connected with the conductive nozzle through threads, the adjusting sleeve moves forwards and backwards through left rotation and right rotation, an external force is applied to the taper of the conductive block when the adjusting sleeve moves forwards, the axial force generated when the adjusting sleeve moves forwards is converted into a radial force through the taper, and therefore the adjusting sleeve can generate inward pressure on the conductive block to enable the conductive block to be folded, and the purpose of adjusting the distance between the conductive blocks is achieved. When the conductive blocks are worn, the rotary adjusting sleeve advances, the distance between the conductive blocks is reduced until the conductive blocks are just in contact with the welding wire, and therefore the conductivity of the contact nozzle is improved. If the conducting block clamps the welding wire too tightly, the welding wire is not smoothly discharged, the adjusting sleeve can be rotated to move backwards, the force applied to the conducting block by the adjusting sleeve is reduced, and the welding wire is smoothly discharged. The forward and backward distance of the adjusting sleeve is realized by rotating the screw thread, so that the adjusting sleeve is convenient to adjust, and the accuracy of adjusting the distance of the conductive block by the adjusting sleeve is also ensured. The accuracy of the adjustment is higher if the pitch of the adjustment sleeve thread is changed to a fine thread. Considering that the contact tip can be subjected to high-temperature radiation of electric arc during welding, the adjusting sleeve expands after the temperature rises, the expanded heat insulation sleeve has the risk of loosening, the adjusting accuracy of the conductive block is influenced, and the adjusting sleeve can be made of materials with low thermal expansion coefficient, such as ceramics.

The principle of the invention is that external force is applied to the taper position of the conductive block, the conductive block can move inwards, and the external force can be applied to the conductive block by using the adjusting sleeve. In a similar way, the spring can be used for applying external force to the taper position of the conductive block, the spring can automatically apply force to the conductive block, manual rotation is not needed as an adjusting sleeve is used, the conductive block is convenient to adjust, the conductive block can always keep good contact with a welding wire under the action of the spring after the conductive block is worn, and the conductive performance of the conductive nozzle can always keep an optimal state. The welding quality is further improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: the conductive nozzle is divided into a main body and an adjusting sleeve, and the front end of the main body is provided with two symmetrical conductive blocks. The length and the structure of the conductive block are determined according to three aspects, namely the length of the conductive nozzle, the resistance from the conductive block when the adjusting cap needs to be screwed forwards after the conductive block is worn is not too large, and sufficient materials are reserved for the conductive block to be worn by welding wires. The main body is provided with a thread connected with the adjusting cap, in order to ensure the adjusting precision, the thread with small thread pitch is preferably used, the front of the conductive block is provided with a taper structure, and the purpose is that when the adjusting cap is screwed forwards, acting force draws the two conductive blocks inwards on the taper. The adjusting cap is made of a splash-proof material, and if the splash-proof material is not used, the material is subjected to splash-proof treatment. Comprehensive analysis shows that the adjusting cap made of the ceramic is the optimal scheme, the ceramic material is free of splashing and high-temperature resistance, and the greatest benefit is that the thermal expansion coefficient is low and the adjusting cap is not expanded after high temperature. The main body of the conductive nozzle is usually made of copper with good conductivity, the copper is high in thermal expansion coefficient and easy to expand when heated, the main body is connected with the adjusting sleeve through threads, the main body is external threads, the adjusting sleeve is internal threads, the external threads are screwed into the internal threads, the main body is made of copper, the adjusting sleeve is made of ceramic, the copper expands after being heated, the ceramic does not expand, and the copper expands to be more tightly contacted with the ceramic, so that the stable connection of the main body and the adjusting cap is realized. If the adjusting cap does not use a material with a low thermal expansion coefficient, the adjusting cap can generate the sign of loosening and retreating after being heated and expanded, the retreating of the adjusting cap can lose the constraint on the conductive blocks, and the distance between the two conductive blocks which lose the constraint is at risk of increasing, so that the conductivity of the conductive nozzle is influenced. The ceramic adjusting sleeve with low thermal expansion coefficient is adopted, and the connection is more stable, so that the position of the adjusting sleeve cannot be changed, good constraint can be generated on the conductive block, and the conductivity is better. The adjusting sleeve adopts a closed structure, the whole conductive blocks are wrapped inside, gaps formed between the conductive blocks are eliminated, and the anti-splashing effect is better.

In order to obtain better conducting effect, the part of the function of the adjusting sleeve for applying external force to the conducting block is replaced by the spring, and the external force is applied to the conducting block by utilizing the characteristic that the spring can generate lasting stress, so that the conducting block and the welding wire are always kept in good contact, and the conducting nozzle can always keep the best conducting effect on the welding wire. To achieve this, the structure of the contact tip needs to be further adjusted. The main body is divided into a body and a core body, and the body is connected with a welding gun. The front end of the core body is provided with a conductive block, the front end of the conductive block is provided with a taper, the direction of the taper is opposite to that of the first scheme, and the taper faces the rear side of the core body. The spring is inserted from the back of the core body, the front end of the spring is in taper contact with the conductive block, the back end of the core body is inserted into the body, and the back end of the spring is propped against the front arm of the body. The distance of the core body inserted into the body is to ensure that the spring is compressed, so that the spring generates a force and is applied to the taper of the conductive block, and the rigidity of the conductive block is not too high, so that the conductive block can automatically contract after being worn, and the conductive block always keeps the optimal contact state with the welding wire. The elasticity of the spring is not too large, otherwise the adverse effect of unsmooth wire output can be caused. The connection between the body and the core body needs to be firm, the core body is prevented from being separated from the body, and enough contact area needs to be ensured, so that the conduction of electric energy is facilitated. The scheme ensures that the conductivity of the contact tube achieves the best effect and the welding quality is also the best. Because the contact nozzle works in a high-temperature environment, the spring is preferably made of nickel-based high-temperature resistant material, so that the influence of the relaxation of the spring in the high-temperature environment on the electric conduction effect is avoided. In addition, a sleeve is added outside the spring, and the double effects of splashing prevention and heat insulation can be achieved.

The contact blocks are worn and then inwardly folded so that the contact nozzle can continuously meet the use condition, when the two contact blocks are completely contacted, the contact blocks are ground into a round hole with the same aperture as that of the welding wire by the welding wire, and the service life of the contact nozzle can still be prolonged to the service life of a commercial traditional contact nozzle in the market. So the service life is longer than that of the traditional contact tube.

The invention has the beneficial effects that: the conductive nozzle body and the adjusting sleeve are added with the characteristics of screw thread, taper, ceramic material and the like, and the conductive nozzle body and the adjusting sleeve are closely matched, so that the aim of accurately adjusting the distance between the upper conductive block and the lower conductive block only by rotating the adjusting sleeve is fulfilled. Compared with the traditional method that tools such as pliers are additionally used, and the adjusting distance is not well controlled, the efficiency is improved, the adjusting precision is higher, and the method is more convenient and fast. The closed structure of regulation has avoided splashing and has got into in the crack of conducting block, has played the effect of isolated splashing.

The spring plays a role of continuously applying an external force on the taper of the conductive block, so that the conductive block is more fully contacted with the welding wire; when the conductive block is abraded by the welding wire, the spring automatically folds the conductive block inwards, so that the contact tip is always in the optimal contact state with the welding wire in the welding process, the conductivity can be always kept to be optimal, and the welding quality is further improved.

The adjusting sleeve wraps the conducting block inside, plays the role of isolating the conducting block, blocks the heat radiation from the electric arc by the adjusting sleeve during welding, and the temperature of the conducting block is lower than the traditional conducting nozzle directly exposed under the electric arc environment, so that the high-temperature softening phenomenon is greatly reduced, the conducting block is more wear-resistant under the same material condition, and the service life of the conducting nozzle is also longer.

The conductive block can be folded inwards after being worn, so that the conductive nozzle can continuously keep good conductivity, the conductive nozzle can be continuously used for a longer time, and the service life of the conductive nozzle can be prolonged by 4-6 times compared with the traditional commercialized conductive nozzle in the market.

Drawings

FIG. 1 shows a block diagram of an easily adjustable durable welding contact tip having a body with external threads.

Fig. 2 shows a structure of an easily adjustable durable welding contact tip using an internal thread in a body.

Fig. 3 shows a structure diagram of the easily-adjusted durable welding contact tip with the guide hole being a cylindrical hole and a conical hole.

Fig. 4 is a block diagram of a short length easy to adjust durable welding contact tip.

Fig. 5 shows a structure of an easily adjustable durable welding contact tip with reverse adjustment.

Fig. 6 shows a block diagram of an easily adjustable durable welding tip with spring force to the rear end of the tip.

Fig. 7 shows a block diagram of an easily adjustable durable welding tip with spring force to the tip of the tip.

Fig. 8 shows a structure diagram of an easily adjustable durable welding contact tip with spring force on a conductive block.

Fig. 9 is a structural view of an easily adjustable durable welding contact tip in which a spring and an adjusting sleeve simultaneously apply an external force to a conductive block.

FIG. 10 is a diagram showing a structure of a conductive nozzle core having a material reducing groove in a conductive block on one side and no material reducing groove in a conductive block on the other side.

Fig. 11 shows a structure of a contact tip core body with oblique slits between conductive blocks.

Fig. 12 shows a structure diagram of a conductive block with a material reducing groove on one side and a taper on two sides.

Fig. 13 is a view showing a structure of a main body having a separation preventing pin at a front end of a conductive block.

Fig. 14 shows a simplified three-dimensional view of an easily adjustable durable welding contact tip.

FIG. 15 shows a three-dimensional view of a body with a conductive block width smaller than the wire diameter.

Fig. 16 shows a three-dimensional view of a graduated, easily adjustable durable welding contact tip.

Fig. 17 shows various patterns of easily adjustable durable welding tip connections.

Fig. 18 shows a three-dimensional view of an elongated easily adjustable durable welding tip.

Fig. 19 shows a three-dimensional view of a short gauge easily adjustable durable welding contact tip.

The numbering in the figures means: 100-main body, 105-connecting part, 110-dismounting plane, 115-main body thread, 120-engaging part, 125-conducting block, 130-containing part, 135-limiting plane, 140-spring column, 145-supporting platform, 150-reference scale and 155-guide column. 200-adjusting sleeve, 205-adjusting sleeve thread, 210-adjusting hole, 215-twisting plane, 220-guide hole, 225-splash guard, 230-curling edge, 235-heat insulation groove and 240-adjusting scale. 300-core body, 305-flanging; 400-a spring; 500-connecting pins; 600-bearing ring; 700-anti-drop pin.

Detailed Description

Example 1: fig. 1 is a structural view of the present embodiment. This figure shows the contact tip in an unworn state, the contact tip being composed of a body 100 and an adjustment sleeve 200. The main body 100 is made of a material having good electrical conductivity, such as copper, silver, aluminum, graphene, or the like. The adjusting sleeve 200 can be made of various metal materials, and when the materials are selected, the materials with the thermal expansion coefficient lower than that of the main body 100 are preferably selected, and the materials also have certain anti-spattering performance, for example, the materials with poor anti-spattering performance are used and need to be subjected to anti-spattering treatment. But the best solution is ceramic because ceramic not only can play a good role in preventing splashing for welding any material, but also has low thermal expansion coefficient and good stability in connection with the main body 100. The rear end of the body 100 is a connection part 105 to the welding torch, and the contact tip is usually screwed (female or male) to the welding torch, but may be connected by another method, and the structure of the connection part 105 is determined by the structure of the welding torch. A cylindrical hole for the welding wire to pass through is formed in the main body 100; the mounting/dismounting plane 110 is used to mount the contact tip to the welding gun and to dismount the contact tip from the welding gun after the contact tip is used up. In order to ensure that the electric energy of the welding gun can be well transmitted to the contact tip, the contact tip and the welding gun are firmly connected, and the dismounting plane 110 is used for mounting or dismounting the contact tip by using a wrench. The main body thread 115 is an external thread and is engaged with an internal thread of the adjusting sleeve thread 205, the length of the main body thread 115 plus the engaging part 120 is the length of the adjusting thread of the main body 100, and the length of the adjusting sleeve thread 205 plus the engaging part 120 is the length of the adjusting thread of the adjusting sleeve 200. The splash guard 225 prevents weld spatter from sticking to the body threads 115, thereby ensuring smooth twisting of the adjustment sleeve 200. The conductive bumps 125 are disposed at the front end of the main body 100, and the number of the conductive bumps 125 is not limited, and is preferably 2-4, and 2 is illustrated. There is a gap between the contact blocks 125, and when the gap is smaller than the diameter of the welding wire, the larger the gap is, the longer the service life of the contact tip is, and when the gap is larger than the diameter of the welding wire, the service life of the contact tip can not be prolonged. The front end of the conductive block 125 is a taper structure, the direction of the taper is forward, and other structures of the conductive block 125 can be flexibly designed by combining the structure of fig. 1 under the following conditions, wherein firstly, enough materials are required for the head to be worn by welding wires, secondly, enough sectional areas are required to ensure the transmission of electric energy, thirdly, the rigidity is as low as possible, and the adjustment sleeve 200 is prevented from causing great resistance when being screwed forward. The distance between the upper and lower conductive blocks 125 is equal to the diameter of the welding wire, and the contact area with the welding wire may be increased appropriately to improve the conductivity of the conductive blocks 125. A concave arc surface matched with the diameter of the welding wire can be arranged on the conductive block 125, so that the welding wire is embedded into the conductive block 125 a little, the distance between the conductive blocks 125 is slightly smaller than the diameter of the welding wire, the concave arc surface is not too deep, and the service life of the contact tip is reduced. The adjusting sleeve 200 is a hollow structure, the front end of the adjusting sleeve is a guide hole 220, the guide hole 220 and the cylindrical hole guide hole in the main body 100 are on the same axis, and the guide hole 220 can be a cylindrical hole or a conical hole as long as the welding wire can be ensured to pass through smoothly. The cylindrical adjusting hole 210 is arranged behind the guide hole 220, a tapered transition structure is arranged between the adjusting hole 210 and the cavity at the rear end of the adjusting sleeve 200, so that the adjusting sleeve 200 can have enough strength, the taper can be consistent with or inconsistent with the taper of the conductive block 125, and if the strength of the adjusting sleeve 200 is enough, the adjusting hole 210 and the cavity at the rear end of the adjusting sleeve 200 can be in right-angle transition. Normally, the adjusting sleeve 200 can be screwed forward or backward by touching the outer surface of the adjusting sleeve 200 with fingers, and in order to increase the friction force, the outer surface of the tail of the adjusting sleeve 200 can be roughened to prevent the adjusting sleeve 200 from slipping during screwing (the surface of the head should be as smooth as possible to prevent splash and adhesion). When the condition of not being able to be screwed by hand occurs, the adjustment sleeve 200 is screwed by a wrench from the screwing plane 215. Before the contact tip is used, the contact tip is firstly installed on a welding gun and screwed down from the dismounting plane 110 by a wrench, if the condition that a welding wire cannot penetrate out is met, the adjusting sleeve 200 can be unscrewed backwards and then tried, if the welding wire cannot penetrate out, the adjusting sleeve 200 is completely unscrewed, the welding wire penetrates out of the main body 100 and extends out for a distance, and the adjusting sleeve 200 penetrates out of the welding wire and then is screwed on the main body 100. After the contact tip is installed, whether the contact between the welding wire and the contact block 125 is in the optimal state is judged, if the contact block 125 clamps the welding wire too tightly, the adjusting sleeve 200 is unscrewed backwards a little, and if the contact block is too loose, the adjusting sleeve 200 is screwed forwards a little. When the welding wire wears the contact tip, the adjusting sleeve 200 is screwed forward, and then the adjusting sleeve 200 applies an external force on the conical surface of the conductive block 125, so that the direction of the force is changed by the conical surface, the conductive block 125 contracts inward, and the contact between the conductive block 125 and the welding wire is restored to the state before welding. The above steps are repeated until the gap between the contact blocks 125 is zero, and at this time, the contact blocks 125 are ground into a round hole with a diameter equivalent to that of the welding wire by the welding wire, even if the contact tip has a service life longer than that of a traditional contact tip, namely, the welding wire through hole of the traditional contact tip is larger than the outer diameter of the welding wire.

While the adjusting sleeve 200 moves forward, the conductive block 125 also slowly enters the adjusting hole 210, and the length of the accommodating part 130 is also shortened. The accommodating portion 130 may be a threaded structure engaged with the threads on the adjusting sleeve 200, but since the accommodating portion 130 is exposed, if the welding spatters on the threads, the accommodating portion will block the internal threads on the adjusting sleeve, which brings about a certain trouble to the adjustment of the contact tip, so that the accommodating portion 130 is optimally a smooth surface structure. The length of the receiving portion 130 is equal to the length of the adjusting hole 210, and when the conductive block 125 enters the adjusting hole 210 by the same length as the adjusting hole 210 itself, the adjusting sleeve 200 cannot be screwed forward, and the conductive nozzle loses the adjusting function. Therefore, the foremost ends of the upper and lower two (or possibly 3 or 4 or even more) conductive blocks 125 should be close to each other, i.e. the distance between the heads of the two conductive blocks 125 is zero. The length of the conductive block 125 entering the adjusting hole 210 should be less than or equal to the length of the adjusting hole 210 itself, and if the length of the conductive block 125 entering the adjusting hole 210 reaches the length of the adjusting hole 210 itself, and there is a gap at the foremost ends of the upper and lower conductive blocks 125, it indicates that the conductive nozzle can be used continuously, and the maximum service life of the conductive nozzle is not brought into full play. The degree of taper of the conductive block 125 matches the length of the adjustment aperture 210. As can be seen from the structure of fig. 1, the larger the degree of taper of the conductive block 125 is, the shorter the distance that the adjusting sleeve 200 needs to be screwed forward when the heads of the two conductive blocks 125 are closed together is, the shorter the length of the conductive block 125 entering the adjusting hole 210 is, the shorter the length of the adjusting hole 210 is, and vice versa. Therefore, if the degree of taper of the conductive block 125 is small, the length of the adjustment hole 210 is also long, and vice versa. The taper of the conductive block 125 is not too large, the distance that the adjustment cap 200 needs to advance to close the conductive block 125 to a tight state is short, which affects the adjustment accuracy, and in order to improve the adjustment accuracy, the main body thread 115 and the adjustment sleeve thread 205 can adopt threads with smaller thread pitches, so that the number of turns of the same adjustment size can be more. Similarly, the taper of the conductive block 125 is not too small, otherwise the adjustment distance is too long, and the length of the hole 210 and the length of the contact tip are also long. Taking a contact tip using a 1 mm welding wire as an example, it is recommended that the length of the conductive hole 210 is 2 mm, the length of the contact tip before use is 1 mm longer than that of a conventional contact tip, and as the contact block 125 is worn, the adjusting sleeve 200 is slowly screwed forward (i.e., the rear end of the contact tip), and the total length of the contact tip is slowly shortened. When the distance that the conductive block 125 enters is equal to (or less than) the length of the adjusting hole 210, the adjusting sleeve 200 moves forward by 2 mm (or less than 2 mm), which is 1 mm (or less than 1 mm) shorter than the conventional contact tip, and the distance of the foremost end of the conductive block 125 is zero. In the case of the same degree of taper for the conductive bumps 125, the larger the wire diameter, the larger the gap between the conductive bumps 125 before use, and therefore the longer the distance the adjustment sleeve 200 needs to move to bring the distance between the conductive bumps 125 to zero. In the welding production, the adjusting distance, namely the length of the forward movement of the adjusting sleeve 200, can be set according to the actual situation and the size of the welding wire. In this embodiment, the adjusting hole 210 of the adjusting sleeve 200 or the transition portion between the adjusting hole 200 and the cavity restricts the conductive block 125, so as to ensure good contact between the conductive block 125 and the welding wire.

For the convenience of adjustment, it is the optimal choice to adopt the screw thread to realize the back-and-forth movement of adjusting sleeve 200, and main part 100 and adjusting sleeve 200 are again through this threaded connection, and the welding makes the temperature of contact tube rise rapidly, and the metal mostly has the characteristic of expending with heat and contract with cold, if adjusting sleeve 200 produces great inflation, then will move backward because of becoming flexible with the connection of main part 100, the regulating sleeve 200 that moves backward becomes poor to the constraint ability of conducting block 125, will produce the risk that conducting block 125 and welding wire contact inadequately, influence the electric conductivity of contact tube. The adjustment sleeve 200 is therefore selected as a material having a lower coefficient of thermal expansion than the body 100, with ceramic being the best.

It is known that when the contact tip is heated by the heat radiation from the arc during welding, the temperature of the contact tip is raised, and the adjusting sleeve 200 of the present invention not only serves to adjust the distance between the conductive blocks 125, but also isolates the conductive blocks 125 from the heat source, so that the temperature generated during welding of the conductive blocks 125 is lower. In order to reduce the temperature of the conductive block 125 to the maximum, the adjusting sleeve 200 should wrap the main body 100 in the cavity by a large amount, and at the same time, the contact area between the main body 100 and the adjusting sleeve 200, especially the contact area between the conductive block 125 and the adjusting sleeve 200, should be reduced. If necessary, a heat insulation groove or a heat dissipation groove may be further provided at a relevant portion of the adjustment sleeve 200 to reduce heat conduction.

Example 2: fig. 2 is a structural view of the present embodiment. The main body thread 115 in this embodiment is an internal thread and the adjustment sleeve thread is an external thread. In this embodiment, the front end of the conductive block 125 has no taper, but in order to draw the conductive block 125 inward, the taper is disposed on the adjusting hole 210, so that the adjusting hole 210 has a conical shape. For the convenience of manufacturing, the conductive block 125 is disposed on the core 300, so that the conductive block 125 can be made long, and the cross-sectional size of the conductive block 125 can be increased without increasing the rigidity. The core body 300 and the main body 100 are provided with cylindrical holes for the welding wire to pass through, the core body 300 is connected with the main body 100, the connection between the core body 300 and the main body 100 is tight, and enough contact surface is ensured to be beneficial to the conduction of electric energy, in the figure, the main body 100 and the core body 300 are connected by adopting threads. The core body 300 is disposed on the axis with the cylindrical hole and the guide hole 220 inside the body 100. As can be understood from the description of embodiment 1 in conjunction with fig. 2, the distance between the conductive block 125 and the guide hole 220 is the maximum adjustment distance of the contact tip. When the conductive block 125 is closed to a distance of zero by the adjusting hole 210 with a tapered hole structure, the distance that the adjusting sleeve 200 moves forward (i.e., the rear end of the contact tip) should be less than or equal to the distance between the conductive block 125 and the guiding hole 220. The conicity value of the conical bore of the adjusting bore 210 should therefore be taken under such preconditions. In this embodiment, the main body screw 115 is an internal screw, and the adjusting sleeve screw 205 is an external screw, in contrast to embodiment 1, so that the adjusting sleeve 200 should be made of a material having a higher coefficient of thermal expansion than the main body 100, for example, the main body 100 is made of copper, and the adjusting sleeve 200 is made of aluminum, zinc, magnesium, manganese, or the like. If the adjustment sleeve 200 is made of a material having a higher coefficient of thermal expansion than the body 100, the opposite effect is achieved and the adjustment sleeve is more easily loosened during welding. In order to prevent the adjusting sleeve 200 from loosening during welding, a tightening sleeve made of a material with a low thermal expansion coefficient can be added on the outer surface of the adjusting thread position of the main body 100 to restrict the expansion of the main body 100 and avoid the loosening of the adjusting sleeve 200.

Example 3: in this embodiment, the adjusting sleeve 200 is provided with internal threads, and the adjusting hole 210 is a conical hole, as shown in fig. 3. The structure of the conductive block 125 can be flexibly handled while satisfying the three preconditions described in embodiment 1. The front end of guide hole 220 is the cylinder hole, and the rear end is the circular cone hole, and the front end of adjusting collar is the fillet structure, and the purpose reduces the planar area of head, can effectively reduce the adhesion that splashes. In addition, the surface roughness of the adjusting sleeve 200, particularly the head, is optimized to be smoother, and the effect of reducing splashing adhesion can also be achieved. Although the ceramic adjusting sleeve has the characteristic of low thermal expansion coefficient, the toughness is not good as that of a copper adjusting sleeve, and the adjusting sleeve 200 is made of ceramic or metal such as copper, aluminum and the like and needs to be flexibly selected according to actual conditions.

Example 4: fig. 4 is a structural view of the embodiment designed for a short-sized contact tip. The contact tip has various lengths, some long and some short, and the embodiment 1 and the example 2 are suitable for being applied to the contact tip with a longer model. But if a short contact tip is required, the above solution is not suitable. It has been stated above that the structure of the conductive block 125 should satisfy the following three conditions, i.e. the front end requires enough material for the contact tip to wear, the rigidity cannot be too large, and the cross-sectional size is enough to satisfy the transmission of electric energy. It is not sufficient to simply shorten the length of the conductive block 125 while shortening the length of the body 100. Furthermore, the splash guard 225 is eliminated, so that the length of the adjustment thread of the body 100 is only the length of the engagement portion 120, and the length of the adjustment sleeve 200 is also the length of the engagement portion 120 plus the length of the adjustment sleeve thread 150. When the splash portion is removed 225, the adjusting sleeve thread 205 is moved to the outermost side, and in order to allow the adjusting sleeve 200 to be screwed forward, the outer diameter of the receiving portion 130 must be smaller than the small diameter of the adjusting sleeve thread 205, and only then the adjusting sleeve thread 205 can enter the receiving portion 130.

In order to further shorten the length of the contact tip, the attachment/detachment plane 110 and the receiving portion 130 may be fused together. The accommodating part 130 is a cylindrical structure, the outer diameter of the accommodating part is smaller than the small diameter of the adjusting sleeve thread 205, and after the condition is met, a pair of symmetrical planes are machined on the accommodating part 130 to be used as the dismounting plane 110. However, such a method should satisfy a condition that the outer diameter of the receiving portion 130 is larger than the small diameter of the external thread if the contact tip is connected to the welding gun using the external thread. Otherwise, the contact tip is screwed into the welding gun too much, and the contact tip is screwed into the welding gun too much, which is equal to the shortening of the length of the contact tip, and the normal welding is influenced. Of course, the contact tip may be disassembled and assembled without machining a plane, and a special wrench specially used for twisting the cylindrical shape may be used. In addition, a hole can be drilled in the accommodating part 130, a cylindrical metal rod is inserted into the hole to screw the conductive nozzle, and the conductive nozzle can be disassembled and assembled in a plurality of ways.

Example 5: fig. 5 is a structural view of the embodiment, which adjusts the contact tip from the opposite direction. The contact tip is shown in a state in which the contact tip has been adjusted to the limit, the heads of the upper and lower conductive pieces 125 have been brought together, and the conductive pieces 125 have been ground into a cylindrical hole having a diameter corresponding to the diameter of the welding wire. Even so, the contact tip has a service life that is comparable to, or even slightly longer than, conventional contact tips, because the bore diameter of the cylindrical bore of conventional contact tips is slightly larger than the diameter of the welding wire. Since the design of this solution is somewhat specific, the method of assembling the contact tip is first described here. The core body 300 is not flanged 305 prior to assembly, and the profile of the region is the same size as the adjacent region, otherwise the contact tip cannot be assembled. The assembly sequence is that the tail part of the core body 300 is firstly inserted from the adjusting hole 210, then the adjusting sleeve 200 is slowly screwed into the main body 100 through the adjusting sleeve thread 205 and the main body thread 115, the tail part of the core body 300 is slowly inserted from the large hole in the middle of the main body 100 while the adjusting sleeve 200 is screwed into the main body 100 until reaching the tail part of the main body 100, in order to ensure the conductivity, the main body 100 and the core body 300 can be fully contacted, and finally the tail part of the core body 300 is processed into a flanging 305. The flange 305 is a connection way of the main body 100 and the core body 300, and the main body 100 and the core body 300 can be connected by interference fit and screw thread. It should be noted that the adjustment sleeve 200 and the core body 300 should be installed first, and if the order of assembling the two is reversed, the assembly cannot be performed. The limit plane 135 is not only a plane, but when the connection portion 105 is an external thread, the limit plane 135 is a cylinder having a smaller diameter than the external thread of the connection portion 105, and then a symmetrical plane is processed, which is a combination of the plane and the cylinder. Such a structure allows the conductive bump 125 to be made longer since the core body 300 is a separate component. Since the direction of the adjusting sleeve 200 when adjusting the contact block 125 is the front end of the contact tip, contrary to the above solution, the taper direction of the contact block 125 should be toward the rear end of the contact tip. The difference with the above solution is also that the total length of the contact tip does not change during use. The length of the taper of the conductive block 125 (i.e. the axial vertical distance of the taper) should be equal to or slightly greater than the length required by the adjusting sleeve 200 to close the conductive block 125, and the height of the conductive block 125 when the head is completely closed should be equal to or slightly greater than the diameter of the adjusting hole 210, so that the characteristics of the technical scheme can be exerted to the maximum extent, and the service life of the conductive nozzle can be exerted to the maximum. The moving direction of the adjusting sleeve 200 is toward the front end of the contact tip when the conductive block 125 is adjusted, so that the splash on the main body thread 115 does not adversely affect the screwing of the adjusting sleeve 200, and the splash-proof part 225 can be eliminated in this embodiment.

In combination with the structure of the main body 100 and the adjustment sleeve 200 in embodiment 2, the main body thread 115 of the present embodiment may be designed as an internal thread, and the adjustment sleeve thread 205 may be designed as an external thread. In order to ensure the smooth screwing of the adjustment sleeve 200, a splash guard 225 is added.

The adjusting hole 210 of the present embodiment can be designed to be a tapered hole structure by combining the structures of the core body 300 and the adjusting sleeve 200 in embodiment 2, but it is necessary to add a boss on the head of the conductive block 125 in embodiment 2, or to retain the tapered structure of the conductive block 125.

Example 6: fig. 6 is a structural diagram of the embodiment, in which the automatic adjustment of the contact tip is realized by moving the adjusting sleeve 200 through the spring 400 (the welding wire is shown in a state that the contact block 125 folded by the spring 400 is expanded), and the embodiment has the advantage that the conductivity of the contact tip is not attenuated and is better until the contact block 125 is ground into a cylindrical hole with a diameter corresponding to that of the welding wire by the welding wire. The main body 100 is provided with a spring column 140, the spring 400 is a spiral spring, the spring 400 penetrates into the spring column 140, the support table 145 provides support for the spring, the adjusting sleeve 200 is inserted into the main body on the premise that the adjusting sleeve 200 does not have a curled edge 230, the curled edge 230 is processed after the spring 400 is compressed, the assembly of the contact tube is completed, and the adjusting sleeve 200 can be ensured to freely slide during assembly. The plasticity of the ceramic material is too poor to perform the crimping process, so the adjustment sleeve 200 in this embodiment is not suitable for using ceramic. In the structure, a force for guiding the rear end of the contact tube is applied to the adjusting sleeve 200 through potential energy generated after the spring 400 is compressed, when the adjusting block 125 is worn, the adjusting sleeve 200 transmits the force to the contact tube 125 through the taper on the adjusting hole 210, and the taper changes the direction of the force, so that the contact tube 125 is automatically folded, and the automatic adjustment of the contact tube is realized. And the conductive block 125 and the welding wire are always kept in a good contact state, the conductivity of the contact tip is always in an optimal state, and the welding quality is better. According to the scheme, on the premise that the cross section of the conductive block 125 can transmit enough electric energy, the cross section is reduced as much as possible, so that the rigidity of the conductive block 125 is reduced. To achieve this, the rear half portion or the whole of the conductive block 125 is designed to have a structure in which a plurality of filaments or sheets are gathered. In addition, the contact area between the adjusting hole 210 and the taper of the conductive block 125 should be minimized to reduce the friction between the two. In addition, increasing the hardness of the tapered surface of the conductive block 125 is also a method of reducing friction. The abutment 145 and the inner wall of the adjustment sleeve 200, the bead 230 and the spring post 140 cannot be in contact too tightly, which would otherwise provide resistance to the adjustment sleeve 200. To minimize friction, the radial surfaces of the spring 400, the spring post 140, the bead 230, the inner wall of the adjustment sleeve 200, and the abutment 145 may be lubricated. Too large a gap between the support 145 and the inner wall of the adjustment sleeve 200, and between the rolled edge 230 and the spring post 140, which would otherwise cause the adjustment sleeve 200 to swing out of order and cause interference of the guide hole 220 with the welding wire. The spring 400 does not have to be too strong to risk filament unraveling, but the spring 400 must have sufficient force to close the conductive block 125 to zero clearance. In order to ensure that the elasticity of the spring is not weakened in a high-temperature environment during welding, the spring 400 should be made of a high-temperature material such as a nickel-based alloy. The spring 400 should have a sufficient free length to ensure that the spring 400 is still in a reasonable compressed state when the adjusting sleeve 200 reaches the dead point (i.e., the adjusting sleeve 200 presses the conductive block 125 to zero).

Example 7: fig. 7 is a structural view of the present embodiment in which the direction of the urging force of the spring 400 is opposite to that of embodiment 6. The conductive block 125 has a projection at the head thereof, so that the conductive block 125 can be folded under the condition that the taper of the adjusting hole 210 of the adjusting sleeve 200 is outward. The effect of the nozzle being ground to a circular hole by the welding wire is shown, where the contact block 125 has been closed to zero clearance. The spring 400 is in the cavity of the adjusting sleeve 200, one end of the spring is limited on the side wall of the front end of the main body 100, the other end of the spring is attached to the front wall of the cavity of the adjusting sleeve 200, and the spring 400 is in a compressed state. The spring 400 applies a force to the adjusting sleeve 200 toward the front end of the contact tip, the adjusting sleeve 200 transmits the force to the conical surface of the contact block 125, and when the welding wire is worn, the contact block 125 automatically contracts inwards, so that the contact tip and the welding wire are always in optimal contact. The contact tip assembly method of this embodiment is similar to that of embodiment 4-the adjustment sleeve 200 and the spring 400 should be installed before the core body 300 is firmly and sufficiently connected to the main body 100. The inner bore of the adjustment sleeve 200 should be able to slide freely on the receiving portion 130, but there should not be too much clearance between the two. Various measures should be taken to reduce the frictional resistance between the adjustment sleeve 200 and the main body 100; the conductive bumps 125 should be made as flexible as possible without affecting the power transfer. The spring 400 cannot relax in a high temperature environment, otherwise the force applied to the conductive block 125 by the adjustment hole 210 may weaken, thereby affecting the conductivity and the service life of the contact tip. The spring 400 may be shaped to have a conical configuration depending on the application.

In conjunction with the above embodiments, the structure of the adjusting holes 210 and the conductive blocks 125 may have various structures, which are not described in detail herein.

Example 8: fig. 8 is a structural diagram of the embodiment in which the force of the spring 400 is directly applied to the tapered surface of the conductive block 125. The contact tip is shown in an unused state, and the conductive piece 125 is pressed to a zero gap by an external force from the spring 400. After the spring 400 is inserted into the core body 300, the core body 300 is firmly and sufficiently coupled to the body 100. One end of the spring 400 is restricted to the side wall of the body 100 and the other end is in contact with the tapered surface of the front end of the conductive block 125. The adjustment sleeve 200 has a twist flat 215 for mounting and dismounting the contact tip. The twist flat 215 is not suitable for use with ceramic because of the large forces it is required to withstand when mounting and dismounting the contact tip. The adjustment sleeve 200 has a heat insulation groove 235 for reducing the heat conducted from the adjustment sleeve 200 to the conductive block 125 and lowering the temperature of the conductive block 125. The number and position of the insulation grooves 235 may be flexibly set according to actual conditions, and the insulation grooves 235 may be further provided on the main body 100 as necessary. The heat insulation groove 235 not only reduces heat conduction but also accelerates heat dissipation, thereby also functioning as a heat dissipation groove. The thermal insulation groove 235 may be further provided on an inner wall contacting the main body 100 for reducing a contact area with the main body 100 to reduce heat transfer. In addition, an insulation pad made of an insulation material may be used at a contact portion between the main body 100 and the adjustment sleeve 200, or an insulation groove 235 may be added to a surface of the insulation pad to reduce heat conduction. In order to prevent the adjustment sleeve 200 from falling off, a connection pin 500 may be inserted between the adjustment sleeve 200 and the main body 100 (the main body 100 and the core body 300 may be connected using the connection pin 500). The main body 100 and the adjusting sleeve 200 can also adopt a method of indentation connection, that is, a hole (or no hole) is drilled in the main body 100, and the material of the adjusting sleeve 200 is pressed into the hole, and the connection between the main body 100 and the adjusting sleeve 200 satisfies two conditions, i.e., the main body 100 cannot fall off, and when the adjusting sleeve 200 is screwed by a wrench, the adjusting sleeve 200 and the main body 100 cannot rotate, but the adjusting sleeve 200 drives the main body 100 to rotate the whole contact tip, and the adjusting sleeve 200 and the main body 100 are kept in a static state. The inner diameter of the spring 400 should be smaller than the height of the taper of the contact block 125 after being closed, so that the characteristics of the technical scheme can be exerted to the maximum extent, and the service life of the contact tip is exerted to the limit. One end of the spring 400 is limited on the side wall of the front end of the main body 100, the other end of the spring is contacted with the conical surface of the conductive block 125, the force generated after the spring 400 is compressed is directly applied on the conical surface of the conductive block, no friction force exists between the adjusting sleeve 200 and the main body 100, no force is needed to push the adjusting sleeve 200, and the loss of the force is smaller. The spring 400 should have high temperature resistance, and the conductive block 125 should be made as soft as possible without affecting the power transmission, so that the advantages of the solution can be fully utilized. The length of the contact tube does not change in the using process of the scheme.

If the contact tip is long enough, the mounting/dismounting plane 110 may be provided on the main body 100 instead of the screwing plane 215. Since the main body has the detachable flat surface 110, the connection pin 500 is not required to prevent the rotation of the adjustment sleeve 200, so that the connection between the main body 100 and the adjustment sleeve 200 can be simplified as long as the connection does not fall off, for example, by a screw connection.

The body 100 and the core body 300 may be combined into one piece by expanding the inner diameter of the spring 400 so that the spring 400 can be inserted from the head of the conductive block 125, the combined piece being similar to the body 100 of fig. 1, but the taper of the conductive block 125 should be changed to the structure of fig. 8. Thus, one end of the spring 400 is restricted on the sidewall of the root of the conductive block 125, and the other end contacts with the taper of the conductive block, and the spring 400 gathers the conductive block 125 by the force generated after compression.

In fig. 8, only the combination of the main body 100, the core body 300 and the spring 400, and the elimination of the adjusting sleeve 200 and the connecting pin 400, can also be a complete solution.

Example 9: fig. 9 is a structural view of the present embodiment, in which the spring 400 and the adjustment sleeve 200 simultaneously apply an external force to the conductive block 125. The front end of the conductive block 125 has tapers in both the front and rear directions, and the spring 400 has a tapered structure. The force-bearing ring 600 is threaded from the support platform 145 and moved to the position of the stop plane 135. The small end of the spring 400 is inserted into the conductive block 125 and contacts the inner tapered surface of the conductive block 125. The core body 300 is firmly and sufficiently connected to the main body 100, and the adjustment sleeve 200 is inserted so that the adjustment hole 210 is in contact with the outer side tapered surface of the conductive block 125. The support ring 600 is pushed forward of the contact tip, the force-bearing ring 600 is moved closer to the adjustment sleeve 200 while compressing the spring 400, and finally the force-bearing ring 600 and the adjustment sleeve 200 are welded to form a whole body which can slide freely on the support base 145. After the conductive block 125 is worn, the adjusting sleeve 200 moves toward the rear of the conductive nozzle, so the inner diameter of the bearing ring 600 should be larger than the outer diameter of the cylindrical surface in the limiting plane 135, otherwise the bearing ring 600 cannot pass through. If the contact tip is of a long gauge, the support 145 can be made longer, and this rule need not be followed. The force bearing ring 600 and the adjusting sleeve 200 can be connected by means of threads, a pin connection 500 and the like. The spring 400, in a compressed state, exerts forces in opposite directions. According to this principle, one end of the spring 400 can directly apply force to the rear tapered surface of the conductive block 125, so as to force the conductive block 125 to be folded inward. The force of the other end of the spring 400 is applied to the force-bearing ring 600 to drive the adjusting sleeve 200 to move towards the rear end of the conductive nozzle, and the adjusting hole 210 applies an external force to the outer conical surface of the conductive block 125 to force the conductive block 125 to be folded inwards. The scheme can better exert the stress formed by compressing the spring 400, and has higher utilization rate of the stress. Since the spring 400 directly applies an external force to the inner conical surface of the conductive block 125 to make the conductive block 125 shrink inward partially, the length of the adjusting hole 210 can be shortened properly, and the length of the contact tip is not changed so much in the using process.

Embodiment 10, fig. 10 shows a structural diagram of a core 300 having a material-reducing groove on one side of a conductive block 125 and no material-reducing groove on the other side of the conductive block 125, and straight slits are formed between the conductive blocks 125. The front end of the conductive block 125 with the relief groove has a taper, and the front end of the conductive block 125 without the relief groove has no taper. The conductive block 125 with the subtractive channel is thin and the conductive block 125 without the subtractive channel is thick. This has the advantage that the relief groove can be made deeper, making the conductive block 125 softer; the conductive block 125 without relief groove can be made larger to compensate for the loss of conductor from the conductive block 125 with relief groove, so that the conductive block 125 has enough conductor to conduct electricity to the welding wire. Since the conductive block 125 with the material reducing groove has a taper, and the conductive block 125 without the material reducing groove has no taper, the spring 400 applies an elastic force to the conductive block 125 with the material reducing groove. The contact block 125 can keep good contact with the welding wire, meanwhile, the elastic force can be transmitted to the contact block 125 without the material reducing groove, so that the contact block 125 without the material reducing groove can keep good contact with the welding wire, the contact block 125 without the material reducing groove has enough conductors for conducting electricity to the welding wire, and the conducting performance of the contact nozzle cannot be weakened due to the deepening of the material reducing groove. Since the conductive block 125 having the relief groove becomes more flexible, the spring 400 having a smaller elastic force can be used, the elastic force of the spring 400 becomes smaller, and the resistance of the conductive block 125 to the welding wire becomes lower.

In order to make the conductive block 125 completely close, if the conductive block on only one side of the material reducing groove has a taper, the height of the taper is inevitably increased. Thereby increasing the outer diameter of the adjustment sleeve 200. In order to reduce the outer diameter of the contact nozzle, the taper can be correspondingly arranged on the conductive block on the side without the material reducing groove, so that the height of the taper on the side of the material reducing groove can be reduced.

Embodiment 11, fig. 11 is a structural diagram of a core body 300 in which the gap between the conductive blocks 125 is an oblique gap. The oblique gap serves as a material reduction groove, so that the cross-sectional size of the conductive block 125 on one side is reduced, and the conductive block 125 on the side becomes softer. Due to the taper of the side conductive block 125, the spring 400 presses the side conductive block 125 to keep good contact with the welding wire, and meanwhile, the elastic force is transmitted to the other side conductive block 125 through the welding wire, and the welding wire keeps good contact with the conductive blocks on the two sides. The conductive block 125 on the other side does not need to be shrunk inward, so the cross-sectional size can be larger to compensate for the loss of the conductor of the conductive block 125 on the side with the smaller cross-sectional size, and thus, the conductor can sufficiently conduct electricity to the welding wire. Thereby ensuring the conductivity and further reducing the resistance of the conductive block 125 to the welding wire. Having a taper on only one side conductive block 125 may result in less friction between spring 400 and conductive block 125 than if both sides of conductive block 125 were tapered.

In order to make the conductive block 125 completely close, if the conductive block on only one side of the material reducing groove has a taper, the height of the taper is inevitably increased. Thereby increasing the outer diameter of the adjustment sleeve 200. In order to reduce the outer diameter of the contact nozzle, the taper can be correspondingly arranged on the conductive block on the side without the material reducing groove, so that the height of the taper on the side of the material reducing groove can be reduced. However, the height of the taper is high, the inner diameter of the spring 400 can be correspondingly increased, the force application point of the spring 400 is farther, and the spring force of the spring 400 required for closing the conductive block 125 with higher taper is smaller according to the lever principle. A compromise between the outer diameter of the adjustment sleeve 200 and the height of the taper is therefore required.

In embodiment 12, the core body 300 achieves the object of the invention, but makes the structure of the contact tip too complicated, increasing the manufacturing cost of the contact tip. In order to simplify the structure of the contact tip, the present embodiment eliminates the core body 300 and uses the main body 100 instead, and the structure of the main body 100 is shown in fig. 12. In order to smoothly fit the spring 400 into the conductive block 125, the inner diameter of the spring 400 should be slightly larger than the height of the taper of the front end of the conductive block 125. The front ends of the conductive blocks 125 are completely closed (at this time, the height of the conductive blocks 125 on both sides should be smaller than the inner diameter of the spring 400), and after the spring 400 is installed in the conductive block 1225, the front end of the spring 400 is shrunk or flattened by using an external force, so that the spring 400 cannot be separated from the conductive blocks. The method not only simplifies the structure of the contact tube, but also realizes the purpose of the invention.

Another method for solving the same problem is to insert the spring 400 into the conductive block 125 by the above-mentioned method, and plastically deform the tapered tip of the conductive block 125 using an external force to increase the height of the taper. The main body 100 is generally made of a metal having good conductivity, such as copper, which is soft and plastic, and thus is not difficult to implement.

Example 13, as shown in fig. 13, in the case of ensuring that there is enough conductor to transmit electric energy, a relief groove is formed in the conductive block 125 on both sides. In order to prevent the spring 400 from bending the conductive block 125 when applying force on the taper of the conductive block 125, which may result in inaccurate filament discharge. A pilot post 155 may be disposed behind the conductive block 125, and the diameter of the pilot post 155 is slightly larger than the inner diameter of the spring 400, so that the spring 400 is inserted into the pilot post 155 to generate an interference fit, and the spring 400 is fixed on the pilot post 155 to pilot the spring 400, thereby preventing the conductive block 125 from being distorted due to the deflection of the spring 400. Since the conductive bumps 125 are skewed to cause the wire to be drawn incorrectly, the end surface of the spring 400 on the side in contact with the taper of the conductive bumps 125 is preferably a flat surface, so that the taper of the conductive bumps 125 on both sides can be applied with force.

The tapered side may also be provided with a pilot column 155, but the inner diameter of the pilot column 155 should be slightly smaller than the outer diameter of the conductive block 125 at that location to ensure that the spring 400 is tender and freely stretchable; the core body 300 may also be provided with corresponding polarization posts 155.

In addition, in order to prevent the spring 400 from slipping off, a slip-off preventing pin 700 may be inserted into the tapered end of the conductive block 125, and may also prevent the spring 400 from slipping off.

Example 14: fig. 14 is a block diagram of the present embodiment, which seeks to achieve the object of the invention with the simplest structure. The adjusting sleeve 200 is simplified into a circular ring structure, a cylindrical hole inside the circular ring is an adjusting hole 210, the conductive block 125 also adopts a taper structure, and what is different, a main body thread 115 is further processed on the conical surface of the conductive block 125, and correspondingly, an adjusting sleeve thread 205 is also processed in the adjusting sleeve 200 (fig. 14 is a three-dimensional diagram, so that the thread cannot be shown). When the conductive block 125 is worn by the welding wire, the adjusting sleeve 200 is screwed forward (behind the contact tip), the conductive block 125 is pressed by the adjusting sleeve 200, the conductive block 125 is folded inward, and the contact between the conductive block 125 and the welding wire is restored to an optimal state. In the above, the number of the conductive blocks 125 is generally 2 to 4, the conductive blocks 125 are symmetrically distributed at 180 degrees when the number is 2, the conductive blocks 125 are uniformly distributed at 120 degrees when the number is 3, and the conductive blocks 125 are uniformly distributed at 90 degrees when the number is 4. The number of the conductive blocks 125 is 3 and more than 3, and the contracted shape of the conductive blocks 125 is also basically a circle (circular contraction). However, if the number of the conductive bumps 125 is 2, the conductive bumps 125 are shrunk only in the height direction, and the conductive bumps 125 are not shrunk in the width direction, i.e., they are shrunk in a non-circular center, so that the size of the conductive bumps 125 in the height direction is smaller and smaller, and the size of the conductive bumps 125 in the width direction is always kept unchanged. When the height dimension of the conductive block 125 is reduced to be smaller than the width dimension, the width dimension will hinder the shrinkage of the conductive block 125, and therefore, when the conductive block 125 is disposed symmetrically at two angles of 180 degrees, the height dimension of the conductive block 125 is reduced to be smaller than the width dimension of the conductive block when the gap is zero. Such a configuration also provides an advantage in this embodiment in that it indirectly reduces the overall length of the helix of the thread, resulting in a reduced chance of the thread becoming stuck by splashing. To prevent loosening, the use of ceramic for the adjustment sleeve 200 is an optimal choice.

According to the structure of the present embodiment, different new technical solutions can be derived by combining the technical solutions of embodiment 2 and embodiment 4, which are not listed here.

Example 15: the embodiment shows a technical scheme with longer service life, as shown in fig. 15. In the above technical solution, when the conductive block 125 is worn to be completely closed, although the service life of the conductive block is still slightly longer than that of a conventional conductive nozzle, it also means that the service life of the conductive nozzle is about to reach the end point. The answer is affirmative if no technical scheme with longer service life exists. The method is to make the width of the conductive block 125 (especially the head) slightly smaller than the diameter of the welding wire, so that no matter how the conductive block 125 is worn, the conductive block 125 never closes, and the service life of the contact tip is not finished until the material of the conductive block 125 is exhausted. The height of the conductive bumps 125 can be made higher to provide more material for the wire to wear.

The core body 300 may have a structure in which the width of the conductive block 125 is smaller than the diameter of the wire with reference to fig. 15.

In any case, the stress amount vertically exerts force on the conductive block 125 when the conductive block 125 is folded, and the height of the conductive block 125 when the conductive block is completely folded should be greater than the width of the conductive block 125, otherwise the conductive block may not be completely folded, and attention is required when the conductive block 125 is processed.

Example 16: in the case of an easily adjustable durable welding tip without the spring 400, to precisely control the adjustment amount of the tip, a scale (as shown in fig. 16), which is a reference scale 150 and an adjustment scale 240, may be added on the surface of the tip. When the adjustment sleeve 200 is rotated, the amount of advance of the adjustment sleeve 200 is determined by observing the amount of movement of the adjustment scale 240 relative to the reference scale 150, thereby precisely controlling the amount of contraction of the conductive block 125. In order to further improve the adjustment accuracy of the contact tip, a corresponding numerical value may be added at a position corresponding to each scale, and the numerical value may represent the movement amount of the adjustment sleeve 200 and may also represent the inward converging amount of the conductive block 125. The numerical value can be flexibly set according to the length of the distance between the scales, if the adjustment quantity of each scale is defined as 0.1 mm, the adjustment quantity of one rotation grid is 0.1 mm, the adjustment quantity of two rotations is 0.2 mm, the numerical value of the corresponding scale is 0.1, 0.2, or 1, 2, and so on. If the adjustment amount of each scale is defined as 0.5 mm, the adjustment amount of one rotation is 0.5 mm, the adjustment amount of two rotations is 1 mm, and the numerical value of the corresponding scale is 0.5, 1, or 5, 10, and so on.

It should be noted that, in the technical solution that the conductive block 125 has a taper and the adjusting hole 210 has no taper, the adjusting sleeve 200 moves forward, even if the forward movement is the same, and the adjusting sleeve 200 shrinks the conductive block 125 more and more finally. This is because the root of the conductive piece 125 is equivalent to a fulcrum, the conductive piece is equivalent to a lever, and when the contact tip is just used, the stress point (the contact point between the conical surface of the conductive piece 125 and the adjusting sleeve 200 is the stress point) is at the forefront of the conductive piece 125 and is farthest away from the fulcrum. The closer the adjusting sleeve 200 is, the closer the force application point is to the fulcrum, and at this time, the front end of the conductive block 125 has moved to the rear of the force application point, and the amount of inward contraction of the conductive block 125 by the force application point is naturally smaller than the amount of contraction of the front end of the conductive block 125. This factor should be taken into account when adjusting the contact tip, or when setting the contact tip scale. However, in general, the length of the forward movement of the adjusting sleeve 200 is relatively short relative to the length of the conductive block 125, and has little influence on the accuracy of the contact tip adjustment. However, if the conductive block 125 is not tapered and the adjusting hole 210 is tapered, the point of application of the adjusting sleeve 200 to the conductive block 125 is always at the foremost end of the conductive block 125, so that the phenomenon cannot occur.

Example 17: fig. 17 shows a structure of an easily adjustable durable welding contact tip connection portion. The first plot from left to right is that the contact tip is connected to the torch using internal threads; the second view is the external thread being connected to the welding gun; the third diagram is a T-connection; the fourth view is a tapered T-connection; the fifth part is connected by external threads, but the front end of the threads has conicity, the connecting part of the fifth part is longer in extending into the welding gun, the part has two functions, when the outer diameter is completely matched with the inner diameter of the welding gun, the function of guiding the contact tip can be realized, when the inner hole is matched with the welding wire, the length of the contact tip is prolonged in a phase-changing manner, under the condition that the length of the part, exposed out of the welding gun, of the contact tip is not changed, the contact area between the contact tip and the welding wire can be increased, and the welding wire can be straightened. For convenience of communication, the portion of the contact tip extending toward the inside of the welding torch is collectively referred to as a straightening portion.

Fig. 18 shows a three-dimensional view of a long easily adjustable durable welding contact tip.

Fig. 19 shows a three-dimensional view of a short length, easily adjustable durable welding contact tip.

To further improve the performance of the easily adjustable durable welding tip, the body 100 or the core body 300 may be subjected to an aging hardening treatment.

The adjustment sleeve 200 and the conductive block 125 move relatively to generate a force, and the taper is used to convert the movement direction of the force, so as to achieve the purpose of drawing the conductive block 125 inward, which is one of the technical principles of the present invention. However, the above embodiment only discloses a technical solution for moving the adjusting sleeve 200 to achieve the object of the invention, and other technical solutions for moving the main body 100 or the core body 300 to achieve the same object can be designed according to the above principle.

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

1. The easily-adjustable durable welding contact nozzle and the method are characterized in that: the conductive nozzle consists of a main body (100) and an adjusting sleeve (200), a connecting part (105) of the conductive nozzle and a welding gun is arranged at the rear end of the main body (100), a cylindrical hole for passing a welding wire is arranged in the main body (100), a conductive block (125) is arranged at the front end of the main body (100), the front end of the conductive block (125) is provided with a taper, a main body thread (115) is arranged on the main body (100), a guide hole (220) is arranged at the front end of the adjusting sleeve (200), the cylindrical hole in the main body (100) and the guide hole (220) are on the same axis, the adjusting sleeve (200) is of a hollow structure and is internally provided with an adjusting hole (210) and an adjusting sleeve thread (205), the main body thread (115) and the adjusting sleeve thread (205) are meshed, the adjusting sleeve (200) is screwed and moved forwards, so that the adjusting sleeve (200) exerts radial force on the conical surface of the conductive block (125), and the conductive block (125) can be folded inwards;

the taper on the adjusting hole (210) can replace the taper on the conductive block (125).

2. The easily-adjustable durable welding contact nozzle and the method are characterized in that: the contact tube consists of a main body (100), an adjusting sleeve (200) and a core body (300), a connecting part (105) of the contact tube and a welding gun is arranged at the rear end of the main body (100), a cylindrical hole for a welding wire to pass through is arranged inside the core body (300) and the main body (100), the rear end of the core body (300) is firmly and fully connected with the main body (100), a conductive block (125) is arranged at the front end of the core body (300), the head part of the conductive block (125) is tapered, a main body thread (115) is arranged on the main body (100), the adjusting sleeve (200) is of a hollow structure, a guide hole (220) is arranged at the front end of the core body (300), the main body (100), the adjusting sleeve (200) and the guide hole (220) are arranged on the same axis, an adjusting hole (210) and an adjusting sleeve thread (205) are arranged in the adjusting sleeve (200), the main body thread (115) is meshed with the adjusting sleeve thread (205), the adjusting sleeve thread (200) is screwed and moves forwards, so that the adjusting sleeve (200) exerts radial force on the conical surface of the conductive block (125), the conductive block (125) will be folded inwards;

3. The easily-adjustable durable welding contact nozzle and the method are characterized in that: the contact tube consists of a main body (100) and a spring (400), a cylindrical hole for a welding wire to pass through is formed in the main body (100), a connecting part (105) of the contact tube and a welding gun is arranged at the rear end of the main body (100), a contact block (125) is arranged at the front end of the main body (100), the front end of the contact block (125) is provided with a taper, the taper faces the rear part of the contact tube, one end of the spring (400) is limited on the side wall of the root part of the contact block (125), the other end of the spring is in taper contact with the contact block (125), and the contact block (125) is inwardly folded by the spring (400) through the taper on the contact block (125).

4. The easily adjustable durable welding contact tip and method as claimed in claims 1 and 2, wherein: the adjusting sleeve (200) is pushed by the force generated after the spring (400) is compressed to fold the conductive block (125) inwards, the support table (145) provides support for one end of the spring (400), the other end of the spring is attached to a turned edge (230) of the adjusting sleeve (200), or one end of the spring (400) is limited on the side wall of the front end of the main body (100), and the other end of the spring is attached to the front wall of the cavity of the adjusting sleeve (200);

or the force generated by compressing the spring (400) is used for pushing the conical surfaces of the adjusting sleeve (200) and the conductive block (125) simultaneously to fold the conductive block (125) inwards, one end of the spring (400) is attached to the force bearing ring (600), the force bearing ring (600) and the adjusting sleeve (200) are connected into a whole, the other end of the spring is contacted with the rear conical surface of the conductive block (125), and the adjusting hole (210) of the adjusting sleeve (200) is contacted with the front conical surface of the conductive block (125).

5. The easily adjustable durable welding contact tip and method of claim 3, wherein: the welding wire clamping device comprises a core body (300), a conductive block (125) is arranged at the front end of the core body (300), the front end of the conductive block (125) is provided with a taper, the taper faces the rear part of a conductive nozzle, the core body (300) is firmly and fully connected with a main body (100), a cylindrical hole for a welding wire to pass through is formed in the core body (300) and the main body (100) on one axis, one end of a spring (400) is limited on the side wall of the front end of the main body (100), the other end of the spring is in contact with a conical surface at the front end of the conductive block (125), and the taper on the conductive block (125) converts axial force generated after the spring (400) is compressed into radial force and then inwards folds the conductive block (125).

6. The easily adjustable durable welding contact tip and method as claimed in claims 3 and 5, wherein: the adjusting sleeve (200) is of a hollow structure, the conductive block (125) is arranged in a cavity of the adjusting sleeve (200), a cylindrical hole for a welding wire to pass through in the main body (100) and the core body (300) and a guide hole (220) in the adjusting sleeve (200) are on the same axis, and the adjusting sleeve (200) is firmly connected with the main body (100).

7. The easily adjustable durable welding contact tip and method as claimed in claims 1, 2, 3, 4, 5, 6, wherein: the main body (100) is provided with a dismounting plane (110);

or the main body (100) is provided with an accommodating part (130);

or a limiting plane (135) on the main body (100);

or the main body (100) is provided with a spring post (140);

or the main body (100) is provided with a supporting table (145);

or the main body (100) and the core body (100) are provided with a pilot column (155);

or the main body (100) is provided with a reference scale (150);

or a connecting pin (500) is arranged between the main body (100) and the adjusting sleeve (200);

or the main body (100) and the adjusting sleeve (200) are connected in a concave-convex way;

or the main body (100) is provided with a heat insulation groove (235) or a heat dissipation groove;

or the main body (100) and the core body (300) are subjected to aging strengthening treatment;

or the connecting part (105) is provided with a straightening part;

or the dismounting plane (110) is a cylinder;

or the adjusting sleeve (200) is provided with a screwing plane (215);

or the adjusting sleeve (200) is provided with a splash-proof part (225);

or the adjusting sleeve (200) is provided with a curled edge (230);

or the adjusting sleeve (200) is provided with an adjusting scale (240); the adjustment scale (240) has a value;

or the adjusting sleeve (200) is provided with a heat insulation groove (235) or a heat dissipation groove;

or the head of the adjusting sleeve (200) is in a round angle structure:

the guide hole (220) is either cylindrical, conical, or has a cylindrical front end and a conical rear end.

8. The easily adjustable durable welding contact tip and method as claimed in claims 1, 2, 3, 4, 5, 6, wherein: the moving body (100) or the core body (300) gathers the conductive block 125;

or the main body (100) is provided with a tightening sleeve;

or the main body (100) and the adjusting sleeve (200) are firmly connected;

or a heat insulation sleeve is arranged at the contact part of the main body (100) and the adjusting sleeve (200);

or the main body (100) or the core body (300) is subjected to aging strengthening treatment;

or the connecting part (105) is smaller than the outer diameter of the accommodating part (130);

or the body thread (110) is an internal thread or an external thread;

or gaps are arranged among the conductive blocks (125);

or the conducting block (125) is provided with a concave cambered surface matched with the welding wire;

or the number of the conductive blocks (125) is equal to or more than two;

or the conductive block (125) is a flexible structure of filament or thin sheet;

or the head of the conductive block (125) is provided with a boss;

or the contact area between the conductive block (125) and the adjusting sleeve (200) is small;

or the contact area of the conductive block (125) and the spring (400) is small;

or the conical surface hardness of the conductive block (125) is very high;

or the front and back directions of the head part of the conductive block (125) are provided with conicity;

or the conical surface of the conductive block (125) is provided with a main body thread (110);

or the conductive block (125) has a uniform cross-section structure or a non-uniform cross-section structure;

or the head of the conductive block (125) is provided with a boss;

or the conductive block (125) at one side is provided with a relief groove, and the front end of the conductive block (125) at the side is provided with a taper; the conductive block (125) at the other side is not provided with a relief groove, and the front end of the conductive block (125) at the side is not provided with a taper; straight gaps are formed among the conductive blocks (125);

or the conductive blocks (125) are obliquely notched, and the front end of the conductive block (125) on the side with small cross section size has taper; the conductive block (125) on the other side has no taper;

or the front ends of the conductive blocks (125) at two sides are provided with tapers, and one side is provided with a material reducing groove or an oblique gap;

or the width of the conductive block (125) is smaller than the diameter of the welding wire;

or the outer diameter of the accommodating part (130) is smaller than the small diameter of the adjusting sleeve thread (205);

or the accommodating part (130) has a smooth surface;

or the accommodating part (130) is provided with a hole;

or the adjusting sleeve (200) is made of a splash-proof material or is subjected to splash-proof treatment;

or the adjusting sleeve (200) is made of a material with a lower thermal expansion coefficient than the main body (100);

or the surface of the tail part of the adjusting sleeve (200) is of a rough structure;

or the adjusting sleeve (200) has a smooth surface;

or the conical surface hardness of the adjusting sleeve (200) is very high;

or the adjusting sleeve thread (205) is an internal thread or an external thread;

or the spring (400) is used for carrying out anti-splashing treatment;

or the spring (400) is made of high-temperature resistant material;

or the spring (400) is a conical spring;

or the spring (400) is a cylindrical spring;

or the diameter of the spring (400) is smaller than the gap between the adjusting sleeve (200) and the conductive block (125);

or lubricating oil is arranged at the friction part among the spring (400), the spring column (140), the curled edge (230), the inner wall of the adjusting sleeve (200) and the support platform (145).

9. The easily adjustable durable welding contact tip and method as claimed in claims 3, 4, 5, 6, wherein: the inner diameter of the spring (400) is expanded and then is placed in the conductive block 125;

or after the core body (300) is inserted into the main body (100), external force is applied to the tail part of the core body (300) to form a flanging (305); the tail part of the core body (300) is provided with a flanging (305);

or after the main body (100) of the core body (300) is processed, radial force is applied to the hole wall of the core body (300) to ensure that the main body (100) and the core body (300) are firmly and fully connected;

the spring (400) is inserted from the front end of the conductive block (125), and then the front end of the spring (400) is shrunk or flattened by using external force; the front end of the spring (400) is smaller than other parts;

or, the spring (400) is inserted from the front end of the conductive block (125), and then the taper part of the conductive block (125) is plastically deformed by using external force, so that the height of the taper is increased; the height of the conductive block (125) is larger than the inner diameter of the spring (400);

or the spring (400) is inserted from the front end of the conductive block (125), and then the anti-falling pin (700) is inserted at the tapered front end of the conductive block (125); the front part of the taper of the conductive block (125) is provided with a separation-preventing pin (700).