Arc welding gun and welding device

Abstract

The invention discloses an electric arc welding gun and a welding device, and relates to the technical field of welding. The electric arc welding gun comprises a grip, a welding gun body and a detection line, the grip is provided with a mounting cavity, a first opening and a second opening are formed in the front end and the rear end of the grip respectively, the welding gun body is mounted in the mounting cavity, one end of the welding gun body extends out of the first opening, and the other end of the welding gun body extends out of the second opening. The other end of the welding gun body is connected with a plurality of pipe bodies extending out of the second opening, the welding gun body comprises a flow guide sleeve and a contact tube, the flow guide sleeve is electrically connected with the contact tube, and the detection line is electrically connected with the flow guide sleeve. The other end of the detection line is used for being connected with a voltage detection unit so as to detect the arc voltage between the contact tube and the workpiece to be welded. The electric arc welding gun can measure the arc voltage, and is high in measurement precision and convenient to use.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more specifically, to an arc welding torch and welding apparatus. Background Technology

[0002] MAG welding (gas metal arc welding) is widely used in many industries such as shipbuilding, marine engineering, automobile manufacturing, bridges, pressure pipelines and pressure vessels. However, during MAG welding operations, there are problems such as welding spatter, which can easily cause weld contamination, poor weld formation, reduced deposition efficiency, decreased arc stability, high cost of welding accessories, obstacles to automated production, and increased post-weld cleaning costs.

[0003] In related technologies, precise current waveform control technology is used to control the energy of each droplet transition to reduce welding spatter. Specifically, the control system uses the electric arc itself as a sensor to detect the arc voltage. Based on the feedback voltage, it determines the instantaneous state of the droplet transition. Then, based on the detected changes in arc voltage, it controls the instantaneous welding current based on the liquid bridge explosion theory, utilizing the surface tension of the liquid metal to achieve a smooth droplet transition and improve welding quality. The key technical points of this control method are the timing and detection accuracy of determining droplet short circuits and liquid bridge breakage. However, there is a significant error in the measurement of arc voltage, limiting its effectiveness in reducing spatter during welding. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, this invention provides an arc welding torch that can measure arc voltage with high accuracy and is easy to use.

[0006] This invention also proposes a welding apparatus.

[0007] The arc welding torch of this invention includes:

[0008] A grip, the grip having a mounting cavity, and a first opening and a second opening respectively provided at the front and rear ends of the grip; The welding torch body is installed in the mounting cavity, with one end of the welding torch body extending out of the first port and the other end of the welding torch body connected to a plurality of tubes extending out of the second port. The welding torch body includes a flow guide sleeve and a conductive nozzle, which are electrically connected. The detection line is electrically connected to the flow guide sleeve, and the other end of the detection line is used to connect to the voltage detection unit to detect the arc voltage between the conductive nozzle and the workpiece to be welded.

[0009] The arc welding torch of this invention, by connecting the detection line to the current-conducting sleeve, can reduce the generation of parasitic resistance and parasitic inductance in the arc voltage measurement circuit, thereby reducing the measurement error caused by voltage drop, facilitating the detection of the real-time current change rate of the arc, improving measurement accuracy, reducing the probability of misjudgment, and thus improving the accuracy of welding current waveform control, effectively reducing spatter during the welding process, and facilitating the improvement of welding quality.

[0010] In some embodiments, the grip includes a left housing and a right housing, the left housing and the right housing are detachably connected, and the left housing and the right housing are assembled to define the mounting cavity, the detection line passes through the mounting cavity, and one end of the detection line extends out through the second opening.

[0011] In some embodiments, the welding torch body includes a fixed base, an outer sleeve is connected to the front end of the fixed base, a protective nozzle is provided at the front end of the outer sleeve, a flow guide sleeve and a conductive nozzle are sequentially disposed in the inner cavity of the protective nozzle, and a detection line is connected to the mounting base and passes through the outer sleeve.

[0012] In some embodiments, an outer insulating layer and an inner insulating layer are provided radially inside the outer sleeve, and the detection line passes between the inner insulating layer and the outer insulating layer.

[0013] In some embodiments, a tail tube is also included, which is disposed at the second port and respectively engages with the left housing and the right housing in the front-rear direction, and the detection line passes through the tail tube.

[0014] In some embodiments, the plurality of tubes include an inlet tube, a return tube, a welding wire guide tube, and a gas tube. The outer sleeve is provided with a cooling layer, a gas inlet layer, and a wire inlet layer arranged radially. The inlet tube is connected to the cooling layer to supply coolant to the cooling layer. The return tube is connected to the cooling layer to drain the coolant from the cooling layer. The welding wire guide tube is connected to the wire inlet layer to supply welding wire to the contact tip. The gas tube is connected to the gas inlet layer to supply protective gas to the contact tip.

[0015] In some embodiments, an outlet channel is restricted between the conductive nozzle and the protective nozzle, and the air inlet layer communicates with the outlet channel.

[0016] In some embodiments, the cooling layer includes a first layer and a second layer, and the air intake layer is disposed between the first layer and the second layer.

[0017] The welding apparatus of this invention includes a welding machine body, a wire feeder, and an arc welding torch of any of the above embodiments. The welding machine body and the wire feeder are electrically connected. The wire feeder is provided with a first connecting end, and the rear end of the welding torch is provided with a second connecting end. The first connecting end and the second connecting end are inserted and fitted together for pipe connection and electrical connection between the wire feeder and the arc welding torch.

[0018] In some embodiments, the voltage detection unit is located on the welding machine body or the wire feeder, and the welding machine body is provided with a negative wire for electrical connection with the workpiece to be welded. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the arc welding gun according to an embodiment of the present invention.

[0020] Figure 2 This is another structural schematic diagram of the arc welding gun according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the welding torch body in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the welding apparatus according to an embodiment of the present invention.

[0023] Figure label: Arc welding torch 100; Grip 1; Switch 11; Trigger 12; Left housing 13; Right housing 14; Tail tube 15; 2. Welding torch body; 21. Flow guide sleeve; 22. Conductive nozzle; 23. Connecting post; 24. Fixing base; 25. Outer sleeve; 251. Outer insulation layer; 252. Inner insulation layer; 253. Inner water channel sleeve; 254. Outer water channel sleeve; 255. Protective nozzle; 26. Detection line 3; Workpiece 4 to be welded; Inlet pipe 5; Return pipe 6; 7. Welding wire conduit; Trachea 8; Welding machine body 9; 10. Wire feeder. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] like Figure 1 , Figure 2 and Figure 3As shown, the arc welding torch 100 of this embodiment includes a handle 1, a welding torch body 2, and a detection line 3. The length direction of the handle 1 is defined as the front-to-back direction.

[0026] The handle 1 has a mounting cavity, and the front and rear ends of the handle 1 are respectively provided with a first port and a second port. The welding torch body 2 is installed in the mounting cavity, and one end of the welding torch body 2 extends out of the first port. The other end of the welding torch body 2 is connected to multiple tubes that extend out of the second port. The welding torch body 2 includes a flow guide sleeve 21 and a conductive nozzle 22. The flow guide sleeve 21 and the conductive nozzle 22 are electrically connected. The detection line 3 is electrically connected to the flow guide sleeve 21. The other end of the detection line 3 is used to connect to a voltage detection unit to detect the arc voltage between the conductive nozzle 22 and the workpiece 4 to be welded.

[0027] The working principle of the arc welding gun 100 in this embodiment of the invention is as follows: the current reaches the conductive nozzle 22 through the conductive channel, the handle 1 is held and the conductive nozzle 22 is brought close to the workpiece 4 to be welded, an electric arc is generated between the conductive nozzle 22 and the workpiece 4 to be welded, and a closed circuit is formed between the conductive nozzle 22 and the workpiece 4 to be welded. The detection line 3, which is electrically connected to the conductive nozzle 22, forms a closed measurement circuit with the workpiece to be welded, and the arc voltage is detected in real time through the voltage detection unit.

[0028] The arc welding torch 100 of this embodiment of the invention, by connecting the detection line 3 to the current guiding sleeve 21, can reduce the generation of parasitic resistance and parasitic inductance in the arc voltage measurement circuit, thereby reducing the measurement error caused by voltage drop, facilitating the detection of the real-time current change rate and voltage of the arc, improving measurement accuracy, reducing the probability of misjudgment, thereby improving the accuracy of welding current waveform control, effectively reducing spatter during the welding process, and facilitating the improvement of welding quality.

[0029] Optionally, the welding torch body 2 is provided with a power supply line that is electrically connected to the conductive nozzle 22. A switch 11 is connected in series on the power supply line, and a trigger 12 is provided on the handle 1 corresponding to the switch 11. The switch 11 is adjusted by the trigger 12 to control the power supply line of the welding torch body 2 to be turned on and off, which facilitates operation and further improves the convenience and safety of the arc welding torch 100 during use.

[0030] Optionally, the welding torch body 2 includes a connecting post 23, the two ends of which are threadedly connected to the flow guide sleeve 21 and the conductive nozzle 22, respectively, and are electrically connected.

[0031] Optionally, the voltage detection unit is a voltmeter.

[0032] In some embodiments, such as Figure 1 and Figure 2 As shown, the grip 1 includes a left housing 13 and a right housing 14. The left housing 13 and the right housing 14 are detachably connected, and the left housing 13 and the right housing 14 are assembled to restrict the installation cavity. The detection line 3 passes through the installation cavity, and one end of the detection line 3 extends out through the second opening.

[0033] In this embodiment, the handle 1 is split into a left shell 13 and a right shell 14, which facilitates the assembly and disassembly of the handle 1. At the same time, it facilitates the installation and maintenance of components such as the welding gun body 2 and the detection line 3. The operation is convenient, safe and reliable. The detection line 3 is passed through the mounting cavity and extends out through the second opening, which facilitates the arrangement of the circuit, improves the integration of the arc welding gun 100 and the protection of the detection line 3, thereby improving the reliability and accuracy of monitoring the arc voltage.

[0034] Optionally, the inner walls of the left housing 13 and the right housing 14 are provided with multiple fixing ribs. The fixing ribs increase the structural strength of the left housing 13 and the right housing 14, and at the same time facilitate the fastening and fixing of the components in the mounting cavity, thereby improving the stability of the arc welding gun 100 during use and the accuracy of arc voltage measurement.

[0035] Optionally, the left housing 13 and the right housing 14 are snap-fitted together, or the left housing 13 and the right housing 14 are connected by fixing bolts.

[0036] In some embodiments, such as Figure 2 and Figure 3 As shown, the welding torch body 2 includes a fixed base 24, an outer tube 25 is connected to the front end of the fixed base 24, a protective nozzle 26 is provided at the front end of the outer tube 25, a flow guide sleeve 21 and a conductive nozzle 22 are arranged in sequence in the inner cavity of the protective nozzle 26, and the detection line 3 is connected to the mounting base and passes through the outer tube 25.

[0037] In this embodiment, the fixing base 24 and the outer sleeve 25 are provided to facilitate the fixing of the welding gun body 2. The protective nozzle 26 is provided to facilitate the installation and protection of the flow guiding sleeve 21 and the conductive nozzle 22. At the same time, the protective nozzle 26 can protect the electric arc generated at the position of the conductive nozzle 22, thereby improving the reliability of welding. The outer sleeve 25 also protects the detection line 3, thereby improving the reliability of the detection line 3 in detecting the arc voltage.

[0038] In some embodiments, such as Figure 3 As shown, an outer insulating layer 251 and an inner insulating layer 252 are arranged radially inside the outer sleeve 25. The detection line 3 is passed between the inner insulating layer 252 and the outer insulating layer 251. By setting the outer insulating layer 251 and the inner insulating layer 252, the protection of the detection line 3 is increased, the electromagnetic interference to the detection line 3 is reduced, and the accuracy of the detection line 3 in detecting arc voltage is improved.

[0039] In some embodiments, such as Figure 1 and Figure 2As shown, it also includes a tailpipe 15, which is located at the second opening and is respectively engaged with the left housing 13 and the right housing 14 in the front-rear direction. The detection line 3 passes through the tailpipe 15. By setting the tailpipe 15, it is convenient to protect multiple pipes and the detection line 3, avoid wear of multiple pipes and the detection line 3 at the second opening, improve the reliability and stability during use, and facilitate the installation of the left housing 13 and the right housing 14 during assembly, making the operation convenient.

[0040] In some embodiments, such as Figure 2 and Figure 3 As shown, the multiple tubes include an inlet pipe 5, a return pipe 6, a welding wire guide 7, and a gas pipe 8. The outer sleeve 25 is provided with a cooling layer, a gas inlet layer, and a wire inlet layer arranged radially. The inlet pipe 5 is connected to the cooling layer to deliver coolant to the cooling layer. The return pipe 6 is connected to the cooling layer to drain the coolant from the cooling layer. The welding wire guide 7 is connected to the wire inlet layer to deliver welding wire to the contact nozzle 22. The gas pipe 8 is connected to the gas inlet layer to deliver protective gas to the contact nozzle 22.

[0041] In this embodiment, the liquid inlet pipe 5, the liquid return pipe 6 and the cooling layer are provided to facilitate the cooling of the welding torch body 2. The welding wire guide pipe 7 and the wire feeding layer are provided to facilitate the delivery of the welding wire. The gas pipe 8 is provided to facilitate the delivery of protective gas to the conductive nozzle 22, reduce interference with the detection line 3 and improve the accuracy of arc voltage detection.

[0042] Specifically, the outer sleeve 25 is sequentially fitted with an inner water channel sleeve 253, an inner sleeve 254, an inner insulation layer 252, and an outer insulation layer 251. The inner water channel sleeve 253 restricts the wire feeding layer for the welding wire to pass through. The inner water channel sleeve 253 and the inner sleeve 254 restrict the cooling layer connecting the liquid inlet pipe 5 and the liquid return pipe 6. The inner insulation layer 252 and the outer insulation layer 251 are used for passing through the detection line 3. The outer insulation layer 251 and the outer sleeve 25 restrict the gas inlet layer for gas delivery.

[0043] In some embodiments, the outlet channel is restricted between the conductive nozzle 22 and the protective nozzle 26, and the gas inlet layer is connected to the outlet channel. By restricting the outlet channel between the conductive nozzle 22 and the protective nozzle 26, it is easier to form a protective gas surrounding the outside of the arc at the position of the conductive nozzle 22, thereby improving the stability of the arc and the welding quality.

[0044] In some embodiments, the cooling layer includes a first layer and a second layer, with an air inlet layer disposed between the first and second layers. By setting the first and second layers, a double-layer cooling structure is formed at the welding body position, which further improves the cooling effect, reduces the impact of temperature changes on the detection line 3, and improves the reliability of the detection line 3 for measuring arc voltage.

[0045] Specifically, the inner water channel sleeve 253 and the inner sleeve 254 are restricted to the first layer where the liquid inlet pipe 5 and the liquid return pipe 6 are connected. An outer water channel sleeve 255 is provided between the outer insulation layer 251 and the outer sleeve 25. An air inlet layer for gas supply is restricted between the outer insulation layer 251 and the outer water channel sleeve 255. The outer water channel sleeve 255 and the outer sleeve 25 are restricted to the first layer where the liquid inlet pipe 5 and the liquid return pipe 6 are connected.

[0046] The welding apparatus of the present invention is described below according to an embodiment of the present invention.

[0047] like Figure 4 As shown, the welding apparatus of this embodiment includes a welding machine body 9, a wire feeder 10, and an arc welding gun 100 of any of the above embodiments. The welding machine body 9 and the wire feeder 10 are electrically connected. The wire feeder 10 is provided with a first connecting end, and the rear end of the arc welding gun 100 is provided with a second connecting end. The first connecting end and the second connecting end are inserted and matched for pipe connection and electrical connection between the wire feeder 10 and the arc welding gun 100.

[0048] Optionally, the first connecting end includes a first wire feeding terminal, a first air inlet terminal, a first liquid inlet terminal, a first liquid return terminal, and a first circuit terminal; the second connecting section includes a second wire feeding terminal, a second air inlet terminal, a second liquid inlet terminal, a second liquid return terminal, and a second circuit terminal. The first wire feeding terminal and the second wire feeding terminal cooperate, the first air inlet terminal and the second air inlet terminal cooperate, the first liquid inlet terminal and the second liquid inlet terminal cooperate, the first liquid return terminal and the second liquid return terminal cooperate, and the first circuit terminal and the second circuit terminal cooperate. The first connecting end and the second connecting end realize the pipe connection and electrical connection between the arc welding gun 100 and the wire feeder 10.

[0049] The welding apparatus of this invention facilitates the detection of the real-time current change rate and voltage of the arc welding torch 100, thereby improving measurement accuracy, reducing the probability of misjudgment, and thus improving the accuracy of welding current waveform control. It also effectively reduces spatter during the welding process and facilitates improved welding quality.

[0050] In some embodiments, the voltage detection unit is located on the welding machine body 9 or the wire feeder 10. The welding machine body 9 is provided with a negative wire for electrical connection with the workpiece 4 to be welded. By locating the voltage detection unit on the welding machine body 9 or the wire feeder 10, the integration of the device is improved, and measurement is facilitated.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "level," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the liquid level of the first feature is higher than that of the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the liquid level of the first feature is lower than that of the second feature.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An arc welding torch, characterized in that, include: A grip, the grip having a mounting cavity, and a first opening and a second opening respectively provided at the front and rear ends of the grip; The welding torch body is installed in the mounting cavity, with one end of the welding torch body extending out of the first port and the other end of the welding torch body connected to a plurality of tubes extending out of the second port. The welding torch body includes a flow guide sleeve and a conductive nozzle, which are electrically connected. The detection line is electrically connected to the flow guide sleeve, and the other end of the detection line is used to connect to the voltage detection unit to detect the arc voltage between the conductive nozzle and the workpiece to be welded.

2. The arc welding torch according to claim 1, characterized in that, The grip includes a left housing and a right housing, the left housing and the right housing are detachably connected, and the left housing and the right housing are assembled to define the mounting cavity. The detection line passes through the mounting cavity, and one end of the detection line extends out through the second opening.

3. The arc welding torch according to claim 2, characterized in that, The welding torch body includes a fixed base, an outer tube connected to the front end of the fixed base, a protective nozzle at the front end of the outer tube, a flow guide sleeve and a conductive nozzle arranged sequentially in the inner cavity of the protective nozzle, and a detection line connected to the mounting base and passing through the outer tube.

4. The arc welding torch according to claim 3, characterized in that, The outer sleeve has an outer insulating layer and an inner insulating layer arranged radially inside, and the detection line passes between the inner insulating layer and the outer insulating layer.

5. The arc welding torch according to any one of claims 2-4, characterized in that, It also includes a tail tube, which is located at the second port and is respectively engaged with the left housing and the right housing in the front-rear direction, and the detection line passes through the tail tube.

6. The arc welding torch according to claim 3 or 4, characterized in that, The plurality of tubes include an inlet tube, a return tube, a welding wire guide tube, and a gas tube. The outer sleeve is provided with a cooling layer, a gas inlet layer, and a wire inlet layer arranged radially. The inlet tube is connected to the cooling layer to supply coolant to the cooling layer. The return tube is connected to the cooling layer to drain the coolant from the cooling layer. The welding wire guide tube is connected to the wire inlet layer to supply welding wire to the contact tip. The gas tube is connected to the gas inlet layer to supply protective gas to the contact tip.

7. The arc welding torch according to claim 6, characterized in that, The conductive nozzle and the protective nozzle restrict the flow channel, and the air inlet layer is connected to the flow channel.

8. The arc welding torch according to claim 6, characterized in that, The cooling layer includes a first layer and a second layer, and the air intake layer is disposed between the first layer and the second layer.

9. A welding apparatus, characterized in that, The device includes a welding machine body, a wire feeder, and an arc welding torch as described in any one of claims 1-8. The welding machine body and the wire feeder are electrically connected. The wire feeder is provided with a first connecting end, and the rear end of the arc welding torch is provided with a second connecting end. The first connecting end and the second connecting end are inserted and fitted together for pipe connection and electrical connection between the wire feeder and the arc welding torch.

10. The welding apparatus according to claim 9, characterized in that, The voltage detection unit is located on the welding machine body or the wire feeder, and the welding machine body is provided with a negative wire for electrical connection with the workpiece to be welded.

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