Nozzle for consumable electrode gas shielded welding gun

Abstract

The utility model relates to the technical field of gas shielded welding guns, and provides a nozzle for a consumable electrode gas shielded welding gun, which comprises a protective nozzle detachably connected to a gun head of the consumable electrode gas shielded welding gun; the water-cooled jacket is in threaded connection with the protection nozzle and located on the periphery of the gun head; the sleeve ring is fixedly arranged on a water cooling ring groove formed in the side wall of the outer circumference of the water cooling sleeve in a sleeving and sealing mode; a water inlet pipe and a water outlet pipe which are symmetrically arranged are arranged on the outer circumferential side wall of the sleeve ring, and the water inlet pipe and the water outlet pipe both communicate with the water cooling ring groove and are used for leading outside cooling water into and out of the water cooling ring groove so as to circularly cool the gun head. The nozzle is divided into two parts which are independent from each other in the front-back direction, disassembly and assembly are rapid, replacement is convenient, the nozzle can be prevented from deforming during long-time continuous welding, splash cannot be accumulated in the nozzle, the service life is long, the replacement and cleaning frequency is greatly reduced, the welding efficiency is improved, and the production cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas shielded welding guns, in particular to a nozzle for a consumable gas shielded welding gun. Background Art

[0002] The gun head of the consumable electrode gas shielded welding gun must be connected to an external nozzle. Its main function is that during welding, active or inert shielding gas is ejected from the welding gun body to form a protective cover at the nozzle mouth, so that the welding wire and the molten pool are in a protective atmosphere isolated from the air.

[0003] During welding, the diameter of the nozzle determines the flow rate of the shielding gas. The larger the nozzle diameter, the greater the flow rate of the shielding gas, which causes the shielding gas to form turbulent flow; the smaller the nozzle diameter, the smaller the flow rate of the shielding gas, which causes the shielding gas to have a small range. It can be seen that a nozzle diameter that is too large or too small will affect the weld formation and surface quality.

[0004] In the prior art, the MIG / MAG welding gun mainly relies on the shielding gas passing through the nozzle to cool the nozzle. In industrial applications, due to the high heat generated during welding and the close proximity of the nozzle to the weld pool, the nozzle is kept at a high temperature for a long time, which will lead to the following problems:

[0005] 1. During continuous welding, the cooling effect of the shielding gas is poor, and a large amount of welding spatter will accumulate at the nozzle mouth. After a certain period of welding or weld length, the spatter at the nozzle mouth must be cleaned, otherwise the inner diameter of the nozzle mouth will be reduced or blocked, thereby reducing the shielding gas flow rate, which will seriously affect the quality of the weld and cause the weld inspection to fail to meet the standards.

[0006] 2. The nozzle is in a high temperature state for a long time, and the nozzle mouth is easy to deform, which in turn affects the range of the protective gas during welding, resulting in poor weld formation.

[0007] 3. Deformed nozzles require frequent shutdowns for replacement, which not only interrupts the production rhythm, but also increases production costs, and is especially not conducive to long-term continuous welding of large components.

[0008] 4. The existing nozzle size is not suitable, and its diameter is too large, which has poor accessibility to thick workpieces, especially difficult to weld at the root of the workpiece. At this time, in order to smoothly weld, a large angle groove needs to be opened on the workpiece, which will cause unnecessary processing difficulties in production. Utility Model Content

[0009] In view of the deficiencies of the prior art, the utility model provides a nozzle for a consumable electrode gas shielded welding gun to solve the problem that the prior protective gas has a poor cooling effect and causes the nozzle to be in a high temperature state for a long time.

[0010] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0011] A nozzle for a consumable gas shielded welding gun, comprising:

[0012] A shielding nozzle is detachably connected to the gun head of the metal arc welding gun;

[0013] A water cooling jacket, threadedly connected to the protection nozzle and located at the periphery of the gun head; and

[0014] A sleeve ring, fixed and sealingly sleeved on a water cooling ring groove provided on the outer circumferential side wall of the water cooling jacket;

[0015] Among them, a symmetrically arranged water inlet pipe and water outlet pipe are provided on the outer circumferential side wall of the sleeve ring, and the water inlet pipe and the water outlet pipe are both connected to the water-cooling ring groove, and are used to introduce external cooling water into and out of the water-cooling ring groove to circulate and cool the gun head.

[0016] In one embodiment disclosed in the present application, the protective nozzle is in a tubular structure, one end of which is provided with a plurality of expansion joints evenly distributed along its axial direction, and an annular groove orthogonal to all the expansion joints is provided on the outer circumferential side wall of the end, and an elastic open ring is clamped in the annular groove;

[0017] Through the expansion and contraction of the expansion joint and the tightening effect of the open ring, the protective nozzle can be quickly connected to the gun head.

[0018] In one embodiment disclosed in the present application, the other end of the protection nozzle is provided with an external pipe thread, and the front third of the water cooling jacket is provided with an internal pipe thread;

[0019] The water cooling jacket is connected with the outer thread of the protective nozzle through its inner thread, so that the rear two-thirds of the water cooling jacket is located outside the gun head and exceeds the conductive nozzle at the gun head by 5 to 10 mm.

[0020] In one embodiment disclosed in the present application, the rear two-thirds of the water cooling jacket has the same inner diameter as the protective nozzle.

[0021] In one embodiment disclosed in the present application, the outer circumferential surface of the rear two-thirds of the water-cooling jacket is arranged in a stepped manner to form the above-mentioned water-cooling ring groove, and the sleeve ring is sealed and covered by welding on the periphery of the water-cooling ring groove to form an annular cavity for circulating cooling water;

[0022] The water outlet of the water inlet pipe and the water inlet of the water outlet pipe are both arranged on the inner circumferential side wall of the sleeve ring, and are eccentrically directed to the outer arc surface of the water-cooling ring groove on different sides of the annular cavity.

[0023] In one embodiment disclosed in the present application, the outer diameter of the sleeve ring is the same as that of the water cooling jacket.

[0024] In one embodiment disclosed in the present application, the outer diameter of the water cooling jacket is 20-24 mm.

[0025] In one embodiment disclosed in the present application, the central angle of a line connecting the center of the water outlet of the water inlet pipe and the center of the water inlet of the water outlet pipe is 60°.

[0026] Compared with the prior art, the beneficial effects of the utility model are:

[0027] The nozzle is divided into two parts, front and back. The front part of the protection nozzle can be detachably connected to the gun head of the MIG / MIG welding gun, and the water cooling sleeve of the rear part is threadedly connected to the protection nozzle, and the cooling water flowing in the annular cavity is used for circulating cooling protection. On the one hand, it can prevent the nozzle from being deformed during long-term continuous welding, and no spatter will accumulate in the nozzle, which has a long service life, greatly reduces the frequency of replacement and cleaning, improves welding efficiency, and saves production costs; on the other hand, the front and back parts are independent of each other, and can be quickly disassembled and replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0030] Figure 2 It is a schematic diagram of the main cross-sectional structure of the utility model;

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of the water cooling jacket;

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of the casing ring. DETAILED DESCRIPTION

[0033] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0039] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0040] See also Figure 1 to Figure 4 As shown, the utility model provides a nozzle for a consumable electrode gas shielded welding gun, comprising:

[0041] The shielding nozzle 100 is detachably connected to the gun head (not shown in the figure) of the metal arc welding gun;

[0042] The water cooling jacket 200 is threadedly connected to the protection nozzle 100 and is located outside the gun head; and

[0043] The sleeve ring 300 is fixed and sealingly sleeved on the water cooling ring groove 210 opened on the outer circumferential side wall of the water cooling jacket 200;

[0044] Among them, a symmetrically arranged water inlet pipe 310 and a water outlet pipe 320 are provided on the outer circumferential side wall of the sleeve ring 300. The water inlet pipe 310 and the water outlet pipe 320 are both connected to the water cooling ring groove 210, and are used to introduce and lead out external cooling water into and out of the water cooling ring groove 210 to circulate and cool the gun head.

[0045] Specifically, the protective nozzle 100 has a tubular structure, and one end thereof is provided with a plurality of expansion joints 110 evenly distributed circumferentially along its axial direction, and an annular groove orthogonal to all the expansion joints 110 is provided on the outer circumferential side wall of the end, and an elastic open ring 120 is clamped in the annular groove; through the expansion and contraction of the expansion joint 110 and the tightening effect of the open ring 120, the protective nozzle 100 can be quickly connected to the gun head.

[0046] The other end of the protection nozzle 100 (the end facing the gun head) is provided with an external pipe thread, and the first third of the water cooling jacket 200 is provided with an internal pipe thread; the water cooling jacket 200 is connected by its internal pipe thread with the external pipe thread of the protection nozzle 100, so that the last two thirds of the water cooling jacket 200 are located outside the gun head and exceed the length of the conductive nozzle at the gun head by 5 to 10 mm. The pipe thread connection has a good sealing effect and is easy to disassemble; the water cooling jacket 200 surrounds the gun head, which can effectively control the overall length of the nozzle, which is conducive to improving the convenience of replacement, disassembly and cleaning during use.

[0047] The rear two-thirds of the water-cooling jacket 200 has the same inner diameter as the shielding nozzle 100. In this way, the cross-section of the internal passages of the shielding nozzle 100 and the water-cooling jacket 200 is guaranteed to remain unchanged, so that the flow path of the shielding gas ejected from the welding gun body is stable and turbulence is avoided, thereby improving the stability of the shielding gas flow rate.

[0048] The outer circumferential surface of the rear two-thirds of the water-cooling jacket 200 is arranged in a stepped manner to form the above-mentioned water-cooling annular groove 210. The sleeve ring 300 is sealed and arranged on the periphery of the water-cooling annular groove 210 by welding to form an annular cavity for circulating cooling water. The water outlet of the water inlet pipe 310 and the water inlet of the water outlet pipe 320 are both arranged on the inner circumferential side wall of the sleeve ring 300, and are eccentrically directed to the outer arc surface of the water-cooling annular groove 210 on different sides of the annular cavity. When working, the cooling water of the external water tank is pumped into the water inlet pipe 310 through the water pump, and sprayed to the outer arc surface of the water-cooling annular groove 210 through the water outlet of the water inlet pipe 310. Through the drainage of the arc surface, the cooling water flows along the annular cavity, and then flows out from the water inlet of the water outlet pipe 320 under the drainage of the outer arc surface of the water-cooling annular groove 210 on the other side, and finally returns to the external water tank, thereby circulating cooling of the gun head and the nozzle. In actual use, the shielding gas of the welding gun itself can exchange heat with the cooling water in the annular cavity and cool down when passing through the shielding nozzle 100, and the shielding effect is better, which can ensure the welding quality. The water outlet of the water inlet pipe 310 and the water inlet of the water outlet pipe 320 are both arranged on the inner circumferential side wall of the sleeve ring 300, so that the front and rear pipe openings of the water inlet pipe 310 and the water outlet pipe 320 have the same diameter, thereby preventing the flow of the cooling water from fluctuating, thereby effectively ensuring the cooling effect during use.

[0049] The outer diameter of the sleeve ring 300 is the same as that of the water-cooling jacket 200. In this way, the diameter of the water-cooling jacket 200 can be limited to not be too large, thereby controlling the size of the nozzle and ensuring accessibility during workpiece welding.

[0050] In this embodiment, the outer diameter of the water cooling jacket 200 is 20-24 mm. Within this range, the accessibility of the workpiece welding is good, which can meet the welding needs of most scenes.

[0051] The central angle of the line between the center of the water outlet of the water inlet pipe 310 and the center of the water inlet of the water outlet pipe 320 is 60°. That is to say, the angle formed by the three points of the water outlet center of the water inlet pipe 310, the center of the sleeve ring 300 and the water inlet center of the water outlet pipe 320 is 60° with the center of the sleeve ring 300 as the vertex. The water outlet of the water inlet pipe 310 and the water inlet of the water outlet pipe 320 are respectively located at 30° on both sides of the vertical plane passing through the center of the sleeve ring 300, so that the cooling water flowing through the water outlet of the water inlet pipe 310 and the water inlet of the water outlet pipe 320 will not interfere with each other, the flow rate is stable, and the cooling effect is good.

[0052] In summary, the nozzle is divided into two parts, front and back. The front part of the protective nozzle 100 can be detachably connected to the gun head of the metal arc welding gun, and the rear part of the water cooling jacket 200 is threadedly connected to the protective nozzle 100, and is circulated and cooled by the cooling water flowing in the annular cavity. On the one hand, it can prevent the nozzle from being deformed during long-term continuous welding, and no spatter will accumulate in the nozzle, which has a long service life, greatly reduces the frequency of replacement and cleaning, improves welding efficiency, and saves production costs; on the other hand, the front and back parts are independent of each other, and can be quickly disassembled and replaced.

[0053] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A nozzle for a metal arc welding gun, characterized in that: include: A shielding nozzle is detachably connected to the gun head of the metal arc welding gun; A water cooling jacket, threadedly connected to the protection nozzle and located at the periphery of the gun head; and A sleeve ring, fixed and sealingly sleeved on a water cooling ring groove provided on the outer circumferential side wall of the water cooling jacket; Among them, a symmetrically arranged water inlet pipe and water outlet pipe are provided on the outer circumferential side wall of the sleeve ring, and the water inlet pipe and the water outlet pipe are both connected to the water-cooling ring groove, and are used to introduce external cooling water into and out of the water-cooling ring groove to circulate and cool the gun head.

2. The nozzle for a metal arc welding gun according to claim 1, characterized in that: The protection nozzle is in a tubular structure, one end of which is provided with a plurality of expansion joints evenly distributed along its axial direction, and an annular groove orthogonal to all the expansion joints is provided on the outer circumferential side wall of the end, and an elastic opening ring is clamped in the annular groove; Through the expansion and contraction of the expansion joint and the tightening effect of the open ring, the protective nozzle can be quickly connected to the gun head.

3. The nozzle for a metal arc welding gun according to claim 1 or 2, characterized in that: The other end of the protection nozzle is provided with an external pipe thread, and the front third of the water cooling jacket is provided with an internal pipe thread; The water cooling jacket is connected with the outer thread of the protective nozzle through its inner thread, so that the rear two-thirds of the water cooling jacket is located outside the gun head and exceeds the conductive nozzle at the gun head by 5 to 10 mm.

4. The nozzle for a metal arc welding gun according to claim 3, characterized in that: The rear two-thirds of the water cooling jacket has the same inner diameter as the protection nozzle.

5. The nozzle for a metal arc welding gun according to claim 4, characterized in that: The outer circumferential surface of the rear two-thirds of the water-cooling jacket is arranged in a stepped manner to form the above-mentioned water-cooling ring groove, and the sleeve ring is sealed and covered by welding on the periphery of the water-cooling ring groove to form an annular cavity for circulating cooling water; The water outlet of the water inlet pipe and the water inlet of the water outlet pipe are both arranged on the inner circumferential side wall of the sleeve ring, and are eccentrically directed to the outer arc surface of the water-cooling ring groove on different sides of the annular cavity.

6. The nozzle for a metal arc welding gun according to claim 1 or 5, characterized in that: The outer diameter of the sleeve ring is the same as that of the water cooling jacket.

7. The nozzle for a metal arc welding gun according to claim 6, characterized in that: The outer diameter of the water cooling jacket is 20-24 mm.

8. The nozzle for a metal arc welding gun according to claim 5, characterized in that: The central angle of the line between the center of the water outlet of the water inlet pipe and the center of the water inlet of the water outlet pipe is 60°.

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