Drawing arc welding gun

Abstract

The utility model discloses a draw arc welding gun which comprises a shell part, a first driving part and a control module, the shell part is provided with an installation cavity, a first hole and a second hole, the first hole and the second hole are communicated with the installation cavity, a ground wire rod and a live wire rod are arranged in the first hole and the second hole in a penetrating mode respectively, and the ground wire rod and the live wire rod are arranged in the front-back direction. The two ends of the live wire rod are arranged outside and the installation cavity respectively, the first driving piece is arranged in the installation cavity and provided with a connecting rod, one end of the connecting rod is connected with the end, located in the installation cavity, of the live wire rod, and the first driving piece can drive the connecting rod to move forwards or backwards so as to drive the live wire rod to move forwards or backwards correspondingly. The control module is electrically connected with the first driving piece, the control module is provided with a switch piece, the control module can control the first driving piece to drive the connecting rod to move backwards to the other end of the connecting rod to abut against the switch piece, and then the control module controls the first driving piece to drive the live wire rod to move forwards by a preset amount to the initial position.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding appliance technical field, especially relate to a draw arc welding torch. BACKGROUND

[0002] The draw arc welding torch is a tool connected with a welding machine to weld a component on a workpiece by an electric arc.

[0003] In the prior art, some draw arc welding torches are widely used in the repair work of the concave sheet metal of the automobile. Specifically, the draw arc welding torch connected with the welding machine can weld the to-be-drawn part (such as an OT gasket, a stud, etc.) on the concave part of the sheet metal, so that the to-be-drawn part is drawn by the draw force device, and the concave part of the sheet metal is deformed and restored. The process of welding the to-be-drawn part on the sheet metal by the draw arc welding torch connected with the welding machine is as follows: 1. The to-be-drawn part on the hot wire rod and the ground wire rod are abutted on the sheet metal; 2. The to-be-drawn part on the hot wire rod is retracted slightly to move away from the sheet metal (the electric current melts the end of the to-be-drawn part and the surface of the sheet metal to form a molten pool); and 3. The to-be-drawn part on the hot wire rod is extended to abut on the sheet metal (i.e., the molten pool), so that the to-be-drawn part is welded and fixed on the sheet metal. However, the inventors have found in many uses that the hot wire rod connected with and driving the to-be-drawn part to retract or extend on the draw arc welding torch is not located at the initial position after the welding work is completed, which affects the next use of the draw arc welding torch. SUMMARY

[0004] The utility model aims at least solves one of prior art technical problems, and therefore, the utility model provides a draw arc welding torch.

[0005] The draw arc welding torch according to the embodiment of the utility model comprises a shell piece, a first driving piece and a control module, the shell piece is provided with a mounting cavity, a first hole and a second hole which are in communication with the mounting cavity, a ground wire rod and a hot wire rod are respectively arranged in the first hole and the second hole, the ground wire rod and the hot wire rod are arranged along the front-back direction, and both ends of the ground wire rod and the hot wire rod are respectively arranged in the mounting cavity and outside the mounting cavity, the first driving piece is arranged in the mounting cavity, the first driving piece is provided with a connecting rod, one end of the connecting rod is connected with one end of the hot wire rod arranged in the mounting cavity, the first driving piece can drive the connecting rod to move forward or backward, so that the hot wire rod can be correspondingly moved forward or backward, the control module is arranged in the mounting cavity, the control module is electrically connected with the first driving piece, and the control module is provided with a switch piece, wherein the control module can control the first driving piece to drive the connecting rod to move backward to the other end of the connecting rod to abut on the switch piece, and then the control module controls the first driving piece to drive the hot wire rod to move forward by a preset distance to the initial position.

[0006] The draw arc welding torch according to the embodiment of the utility model has at least the following advantages

[0007] Advantages:

[0008] In the process of connecting the arc welding gun to the welding machine, the voltage value and other parameters required by different sheet metal thicknesses and other factors are different, so the amount of arc melting the end of the drawing piece is different, therefore, the position of the live wire rod when it extends to abut the drawing piece against the sheet metal (i.e. at the molten pool) is different, in other words, the live wire rod is not at the initial position after the drawing piece is welded, thereby affecting the next use of the arc welding gun and the reliability and safety of the next welding process. To this end, the arc welding gun of the present application is designed with a control module of a switch piece, which can reset the live wire rod after the drawing piece is welded, and the specific process is as follows: 1. The control module controls the first driving piece to drive the connecting rod to move backward to abut the other end of the connecting rod against the switch piece; 2. The switch piece generates a signal and controls the first driving piece through the control module to drive the live wire rod to move forward by a preset amount, so that the live wire rod returns to the initial position.

[0009] According to some embodiments of the present application, the control module is provided with an indicator light, and the shell piece is provided with a third hole, and the indicator light is arranged in the third hole to expose to the outside.

[0010] According to some embodiments of the present application, the shell piece is provided with a fourth hole, and the fourth hole is rotatably provided with a sleeve, and the sleeve cavity is connected with the outside and the mounting cavity to enable wiring through the sleeve.

[0011] According to some embodiments of the present application, the ground wire rod is slidably arranged in the first hole, and the shell piece is provided with a sliding groove in the mounting cavity, and the part of the ground wire rod located in the mounting cavity is provided with a sliding block and a first elastic piece, the sliding block can slide with the ground wire rod, the sliding block is slidably arranged in the sliding groove, and one end of the first elastic piece abuts against the shell piece and the other end abuts against the sliding block.

[0012] According to some embodiments of the present application, the sliding block is provided with a fifth hole and a sixth hole in communication, the sliding block is sleeved on the ground wire rod through the fifth hole, and the sixth hole is used for arranging the power line to enable electrical connection with the ground wire rod.

[0013] According to some embodiments of the present application, the mounting cavity is provided with a locking assembly, and the locking assembly can lock the ground wire rod to limit its sliding.

[0014] According to some embodiments of the utility model, the ground wire rod is provided with a tooth portion at part of the mounting cavity, the locking assembly comprises a swing piece and a second driving piece, the swing piece is rotationally connected to the mounting cavity, the swing piece is provided with a gap, the ground wire rod is arranged in the gap, the second driving piece is arranged in the mounting cavity, the output end of the second driving piece is connected with the swing piece, the second driving piece can drive the swing piece to rotate to an avoiding state or a locking state, wherein when the swing piece is in the avoiding state, the ground wire rod can slide in the gap, when the swing piece is in the locking state, the swing piece is clamped with the tooth portion to limit the ground wire rod from sliding.

[0015] According to some embodiments of the utility model, the front end portion of the live wire rod is provided with a seventh hole arranged along the length direction thereof, and the seventh hole is used for detachably inserting a connecting column of a to-be-drawn piece group.

[0016] According to some embodiments of the utility model, the front end portion of the live wire rod is provided with at least two clamping pieces, the at least two clamping pieces are arranged around the axis of the seventh hole to jointly enclose a penetrating space, and the at least two clamping pieces are threadedly sleeved with a locking piece, wherein when the connecting column of the to-be-drawn piece group is sequentially inserted into the penetrating space and the seventh hole, rotating the locking piece can make the at least two clamping pieces jointly clamp the connecting column of the to-be-drawn piece group.

[0017] According to some embodiments of the utility model, the live wire rod is provided with a gas passage communicated with the seventh hole, and a connecting pipe arranged in the mounting cavity and communicated with the gas passage, the connecting pipe can be connected with a pipeline for conveying protective gas, so that the inner cavity of the pipeline, the inner cavity of the connecting pipe, the gas passage and the seventh hole are sequentially communicated. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0019] Figure 1 A schematic view of the arc-welding gun of the utility model selecting to install one of two to-be-drawn piece groups;

[0020] Figure 2 A partial exploded view of the arc-welding gun shown in FIG. Figure 1

[0021] Figure 3 A structural view of the arc-welding gun shown in FIG. Figure 1

[0022] Figure 4 A structural view of the arc-welding gun shown in FIG. Figure 1 ​​Another structure diagram of the arc welding gun shown in the figure, which is removed from part components and contains the OT gasket;

[0023] Figure 5 For Figure 1 The cross-sectional view of the arc welding gun shown in the figure, which is removed from part components and contains the OT gasket;

[0024] Figure 6 For Figure 1 The cross-sectional view of the arc welding gun shown in the figure, which is removed from part components and contains the OT gasket;

[0025] Figure 7 For Figure 1 The cross-sectional view of the arc welding gun shown in the figure, which is removed from part components and contains the OT gasket.

[0026] Reference signs:

[0027] The shell piece 100, the first hole 110, the second hole 120, the third hole 130, the sliding groove 140;

[0028] The first driving piece 200, the connecting rod 210;

[0029] The control module 300, the switch piece 310, the indicator light 320;

[0030] The ground rod 400, the tooth part 410;

[0031] The live rod 500, the seventh hole 510, the clamping piece 520, the gas channel 530, the connecting piece 540;

[0032] The barrel sleeve 610, the sliding block 620, the fifth hole 621, the sixth hole 622, the first elastic piece 630, the locking piece 640, the second elastic piece 650;

[0033] The locking assembly 700, the swing piece 710, the notch 711, the second driving piece 720;

[0034] The to-be-drawn piece group 800, the mounting seat 810, the connecting column 811, the to-be-drawn piece 820. DETAILED DESCRIPTION

[0035] This part will describe the specific embodiments of the utility model in detail, the preferred embodiments of the utility model are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0036] In the description of the utility model, if it is described to first, second, third, fourth, fifth and so on, it is only for distinguishing technical features for the purpose, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0037] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and is not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it can not be understood as the limitation of the utility model.

[0038] In the utility model, unless otherwise explicitly limited, the words such as "arrangement", "installation", "connection" should be broadly understood, for example, it can be directly connected, also can be indirectly connected through intermediate medium;It can be fixedly connected, can also be detachably connected, can also be integrally formed;It can be mechanical connection;It can be the communication or interaction relationship of two elements inside two elements.

[0039] Reference Figures 1 to 7 The utility model discloses a kind of arc welding torch, it is used to be connected with external welding machine, it includes shell piece 100, first driving piece 200 and control module 300.

[0040] Shell piece 100 is equipped with mounting cavity, and first hole 110 and second hole 120 are communicated with mounting cavity, first hole 110 and second hole 120 are respectively provided with ground rod 400 and fire rod 500, ground rod 400 and fire rod 500 are all arranged along front-back direction, and both ends are all divided into external and mounting cavity, first driving piece 200 is arranged in mounting cavity, first driving piece 200 is motor assembly, first driving piece 200 is equipped with connecting rod 210, connecting rod 210 is screw rod piece, one end of connecting rod 210 and fire rod 500 is connected with one end of mounting cavity, first driving piece 200 can drive connecting rod 210 to move forward or backward, to be able to drive fire rod 500 to move forward or backward correspondingly, control module 300 is arranged in mounting cavity, control module 300 is electrically connected with first driving piece 200, control module 300 is equipped with switch piece 310, wherein, after control module 300 controls first driving piece 200 to drive connecting rod 210 to move backward to other end and abut against switch piece 310, control module 300 controls first driving piece 200 to drive fire rod 500 to move forward to initial position by pre-set amount.

[0041] It can be understood that the live wire rod 500 moves forward or backward, that is, the live wire rod 500 extends or retracts; the switch member 310 can be arranged as a micro switch or the like.

[0042] It can be understood that the first driving member 200 can drive the connecting rod 210 as a screw rod to move forward or backward.

[0043] It can be understood that the first driving member 200 is a motor assembly, which is a servo motor, which can flexibly drive the live wire rod 500 to freely extend or retract according to actual needs, so as to correspondingly drive the live wire rod 500 to extend by a corresponding distance. Of course, it should be noted that the first driving member 200 can also be arranged as a cylinder, an electric push rod or the like.

[0044] In the process of welding the to-be-drawn piece 820 (such as an OT gasket, a stud or the like) to the sheet metal by the arc striking welding gun of the welding machine, different sheet metal thicknesses and other factors require different voltage values and other parameters, so the amount of melting the end of the to-be-drawn piece 820 by the drawn arc is different. Therefore, the position of the live wire rod 500 when the live wire rod 500 extends to abut the to-be-drawn piece 820 to the sheet metal (i.e., the molten pool) is different, that is, the live wire rod 500 is not at the initial position after the welding of the to-be-drawn piece 820 is completed, thereby affecting the next use of the arc striking welding gun and the reliability and safety of the next welding process. In view of this, the arc striking welding gun of the present application is designed with a control module 300 of a switch member, which can reset the live wire rod 500 after the welding of the to-be-drawn piece 820 is completed. The specific process is as follows: 1. The control module 300 controls the first driving member 200 to drive the connecting rod 210 to move backward to abut the other end of the connecting rod 210 to the switch member 310; 2. The switch member 310 generates a signal and controls the first driving member 200 through the control module 300 to drive the live wire rod 500 to move forward by a predetermined amount, so that the live wire rod 500 returns to the initial position.

[0045] In the present embodiment, with reference to Figure 2 , the control module 300 is provided with indicator lights 320, the housing member 100 is provided with third holes 130, and the indicator lights 320 are arranged to protrude outside through the third holes 130. Among them, the indicator lights 320 are arranged as three.

[0046] Through the above structure, the user can observe whether the corresponding indicator light 320 is on or not to determine the state of the arc striking welding gun.

[0047] It can be understood that the content corresponding to the indicator light 320 can be set according to actual conditions.

[0048] In some embodiments, the indicator light 320 can be arranged as four, five or the like according to the number of states of the arc striking welding gun.

[0049] In the present embodiment, with reference to Figure 1 andFigure 2 The housing piece 100 is provided with a fourth hole, and a barrel sleeve 610 is rotatably arranged in the fourth hole. A barrel cavity of the barrel sleeve 610 is in communication with the outside and the mounting cavity to enable the cable to pass through the barrel sleeve.

[0050] It can be understood that, with reference to Figure 2 One end of the barrel sleeve 610 is provided with a joint portion. The barrel sleeve 610 is rotatably arranged in the fourth hole through the joint portion, so that the arc striking welding gun can rotate relative to the barrel sleeve 610.

[0051] Through the above structure, on the one hand, the barrel cavity of the barrel sleeve 610 is in communication with the outside and the mounting cavity to enable the cable to pass through the barrel sleeve, so that the barrel sleeve 610 can be provided for the cable and the gas pipe to pass through, which can facilitate the layout of the cable and the gas pipe and provide certain protection for the cable and the gas pipe, so that the cable and the gas pipe are not easy to be damaged. On the other hand, the barrel sleeve 610 is rotatably arranged in the fourth hole through the joint portion, so that the arc striking welding gun can rotate relative to the barrel sleeve 610, which can improve the flexibility of the user when operating the arc striking welding gun.

[0052] In the embodiment, with reference to Figure 1 and Figure 3 The first hole 110 and the ground rod 400 are both provided in two. The two ground rods 400 are slidably arranged in the two first holes 110 one by one. The two ground rods 400 are separately arranged on two sides of the live rod 500. The housing piece 100 is provided with two sliding grooves 140 located in the mounting cavity. The ground rod 400 located in the mounting cavity is sleeved with a sliding block 620 and a first elastic member 630. The sliding block 620 can slide with the corresponding ground rod 400. The first elastic member 630 is a spring. One end of the first elastic member 630 abuts against the housing piece 100, and the other end abuts against the corresponding sliding block 620.

[0053] Through the above structure, on the one hand, the two ground rods 400 are both slidably arranged and can be compressed and rebounded, which enables the two ground rods 400 to abut against the uneven metal surface. On the other hand, the sliding block 620 is slidably arranged in the corresponding sliding groove 140, so as to limit the sliding range of the corresponding ground rod 400 and avoid the ground rod 400 from excessively sliding out or excessively sliding back.

[0054] The ground rod 400 located in the mounting cavity is sleeved with the sliding block 620. Specifically, with reference to Figure 3 and Figure 5 The sliding block 620 is provided with a fifth hole 621 and a sixth hole 622 in communication. The sliding block 620 is sleeved with the ground rod 400 through the fifth hole 621. The sixth hole 622 is used for sleeving the power line, so that the power line can be electrically connected with the ground rod 400.

[0055] Through the above structure, the sliding block 620 can be sleeved on the ground wire rod 400 through the fifth hole 621, and the power line can be passed through the sixth hole 622 to electrically connect the ground wire rod 400. Therefore, the sliding block 620 has the effects of sliding limiting and providing installation for the power line.

[0056] In the embodiment, referring to Figure 4 and Figure 5 , the mounting cavity is provided with a locking assembly 700 capable of locking the ground wire rod 400 to limit its sliding.

[0057] Through the above structure, when the two ground wire rods 400 abut against the sheet metal for welding work, the locking assembly 700 can lock the two ground wire rods 400 to limit their sliding, so as to avoid the situation that the ground wire rod 400 is separated from the sheet metal and abuts against the sheet metal when the ground wire rod 400 is pulled during the arc welding of the puller 820, thereby ensuring the smooth progress of the arc welding work.

[0058] Specifically, the part of the ground wire rod 400 located in the mounting cavity is provided with a tooth portion 410, and the locking assembly 700 includes a swing piece 710 and a second driving piece 720. The second driving piece 720 is provided as a pneumatic cylinder, and referring to Figure 5 , the swing piece 710 is rotationally connected to the mounting cavity. The swing piece 710 is provided with two notches 711, and the two ground wire rods 400 are correspondingly arranged in the two notches 711. The second driving piece 720 is arranged in the mounting cavity, and the output end of the second driving piece 720 is connected with the swing piece 710. The second driving piece 720 can drive the swing piece 710 to swing backward or forward, so that the swing piece 710 is in a corresponding avoiding state or a locking state. When the swing piece 710 is in the avoiding state, the axis of the notch 711 is parallel or nearly parallel to the axis of the ground wire rod 400, so that the ground wire rod 400 can slide in the corresponding notch 711. When the swing piece 710 is in the locking state, the axis of the notch 711 is inclined relative to the axis of the ground wire rod 400, and the swing piece 710 is clamped into a corresponding tooth groove in the tooth portion 410 (i.e., the swing piece 710 is clamped with the tooth portion 410), so as to limit the sliding action of the ground wire rod 400.

[0059] It can be understood that the second driving piece 720 can also be provided as an electric push rod or the like.

[0060] It can be understood that the tooth portion 410 has a plurality of annular tooth grooves arranged at intervals along the axis of the ground wire rod 400. When the swing piece 710 is clamped into a corresponding tooth groove in the tooth portion 410, the ground wire rod 400 can be locked at a corresponding position.

[0061] In order to facilitate the swing piece 710 to reset to the avoiding state, referring to Figure 4The second elastic member 650 is arranged between the swing member 710 and the housing member 100, and is arranged as a spring.

[0062] The live wire rod 500 is arranged at the front end of the outer portion to be connected with the mounting seat 810. Specifically, refer to Figure 6 The front end of the live wire rod 500 is provided with a seventh hole 510 arranged along the length direction of the live wire rod 500, and the seventh hole 510 is used for detachably inserting the connecting column 811 of the to-be-pulled member group 800.

[0063] It can be understood that the to-be-pulled member group 800 includes the mounting seat 810 and the to-be-pulled member 820 (a stud or an OT gasket) detachably mounted on the mounting seat 810, and the live wire rod 500 is arranged at the front end of the outer portion to be connected with the mounting seat 810. Since the to-be-pulled member 820 is detachably mounted on the mounting seat 810, when the to-be-pulled member 820 is welded on the metal plate, the mounting seat 810 is driven to move relative to the to-be-pulled member 820, so that the to-be-pulled member 820 is separated from the mounting seat 810.

[0064] Through the above structure, refer to Figure 1 The user can insert the connecting column 811 of the mounting seat 810 with the corresponding to-be-pulled member 820 into the seventh hole 510 according to the actual use requirement, so as to perform the welding work of the corresponding to-be-pulled member 820.

[0065] In order to improve the connection stability when the connecting column 811 of the to-be-pulled member group 800 is inserted into the seventh hole 510, refer to Figure 1 , Figure 2 and Figure 6 The front end of the live wire rod 500 is provided with four clamping pieces 520 arranged around the axis of the seventh hole 510 to jointly surround a penetrating space, and the four clamping pieces 520 are threadedly sleeved with a locking member 640. When the connecting column 811 of the to-be-pulled member group 800 is sequentially inserted into the penetrating space and the seventh hole 510, rotating the locking member 640 can make the four clamping pieces 520 jointly clamp the connecting column 811 of the to-be-pulled member group 800.

[0066] It can be understood that rotating the locking member 640 can also make the four clamping pieces 520 release the clamping of the connecting column 811 of the to-be-pulled member group 800, so that the connecting column 811 of the to-be-pulled member group 800 can be pulled out from the penetrating space and the seventh hole 510.

[0067] In the embodiment, refer to Figure 3 , Figure 6 and Figure 7The live wire rod 500 is provided with a gas passage 530 communicated with the seventh hole 510, and a connecting pipe 540 in the mounting cavity communicated with the gas passage 530, the connecting pipe 540 can be connected with a pipe for conveying protective gas, so that the inner cavity of the pipe, the inner cavity of the connecting pipe 540, the gas passage 530 and the seventh hole 510 are communicated in sequence.

[0068] Through the above structure, the welding machine can convey the protective gas through the pipe, so that the protective gas flows through the inner cavity of the connecting pipe 540, the gas passage 530, the seventh hole 510 and the gas outlet passage in sequence and is sent out, so as to exclude harmful gases such as oxygen and water vapor around the molten pool, and prevent the generation of welding defects such as oxidation, pollution and porosity.

[0069] It can be understood that when the to-be-drawn piece 820 on the to-be-drawn piece group 800 is a stud, referring to Figure 1 and Figure 6 The mounting seat 810 includes a front and rear protective sleeve (the material of the protective sleeve is an insulating material such as plastic) connected and a connecting column 811, and is provided with a gas outlet passage, part of which is located in the protective sleeve and part of which is located in the connecting column 811. The to-be-drawn piece 820 which is a stud can be detachably mounted in the part of the gas outlet passage located in the protective sleeve and is protected by the protective sleeve. Therefore, on the one hand, when the connecting column 811 of the to-be-drawn piece group 800 is inserted into the seventh hole 510, the gas outlet passage is communicated with the seventh hole 510, and the welding machine can convey the protective gas through the pipe, so that the protective gas flows through the inner cavity of the connecting pipe 540, the gas passage 530, the seventh hole 510 and the gas outlet passage in sequence and is sent out, and the to-be-drawn piece 820 which is a stud is surrounded by the protective sleeve, so that the protective gas can surround the welding surface (circular) of the stud in a ring shape, so as to ensure high-quality welding of the to-be-drawn piece 820 which is a stud; on the other hand, the to-be-drawn piece 820 which is a stud is protected by the protective sleeve, and the protective sleeve isolates the to-be-drawn piece 820 which is a stud, so that the probability of the to-be-drawn piece 820 which is a stud being accidentally touched to the ground wire rod 400 and sparking during replacement or separation from the mounting seat 810 can be reduced.

[0070] It can be understood that when the to-be-drawn piece 820 on the to-be-drawn piece group 800 is an OT gasket, referring to Figure 1 and Figure 7The mounting seat 810 includes a mounting box and a connecting column 811 arranged in front and back, and the mounting seat 810 is provided with an air outlet channel, part of which is located in the mounting box and part of which is located in the connecting column 811. The to-be-pulled piece 820 of the OT gasket is detachably mounted in the air outlet channel part of the mounting box (specifically, the mounting box is provided with a spring located in the air outlet channel, the to-be-pulled piece 820 of the OT gasket is arranged in the air outlet channel part of the mounting box, and is fixed by the spring). Therefore, on the one hand, when the connecting column 811 of the to-be-pulled piece group 800 is inserted into the seventh hole 510, the air outlet channel is communicated with the seventh hole 510, and the welding machine can deliver the protective gas through the pipeline, so that the protective gas flows through the inner cavity of the connecting pipe 540, the gas channel 530, the seventh hole 510 and the air outlet channel in turn and is sent out, so as to improve the welding quality of the to-be-pulled piece 820 of the OT gasket. The welding surface of the to-be-pulled piece 820 of the OT gasket is in a strip shape, so it is not necessary to protect the protective gas around the protective gas as required in the above-mentioned stud welding. On the other hand, since the to-be-pulled piece 820 of the OT gasket has a long distance from the welding end to the mounting box, the probability of the to-be-pulled piece 820 of the OT gasket being mistakenly touched with the ground rod 400 and sparking is low during the replacement or separation from the mounting seat 810, so it is not necessary to add a protective sleeve for protection.

[0071] In summary, when the to-be-pulled piece 820 is an OT gasket, the process of using the arc welding gun connected to the welding machine to weld the OT gasket to the sheet metal and driving the live wire rod 500 to reset is as follows:

[0072] 1. The OT gasket is detachably inserted into the mounting box part of the mounting seat 810, the mounting seat 810 is inserted into the seventh hole 510 through the connecting column 811, and the four clamping pieces 520 jointly clamp the connecting column 811 by rotating the locking piece 640 (i.e., the work of mounting the OT gasket to the live wire rod 500 is completed);

[0073] 2. The ground rod 400 and the OT gasket mounted on the live wire rod 500 are abutted to the sheet metal, wherein the ground rod 400 can be correspondingly slid to adapt to the concave-convex condition of the sheet metal;

[0074] 3. The second driving piece 720 drives the swing piece 710 to swing forward, the swing piece 710 is in a locked state, and the swing piece 710 is clamped into a corresponding tooth groove in the tooth part 410 to lock the ground rod 400 to limit the sliding of the ground rod 400;

[0075] 4. The welding machine supplies current to the ground rod 400 and the live wire rod 500, and the first driving piece 200 drives the connecting rod 210 to move backward to drive the OT gasket on the live wire rod 500 to move backward by a first distance. At this time, the current draws an electric arc to melt the contact part of the OT gasket and the sheet metal to form a molten pool;

[0076] 5. The first driving component 200 drives the connecting rod 210 forward to drive the OT gasket on the fire wire rod 500 to extend and abut against the sheet metal (i.e., the molten pool), thus completing the welding and fixing of the OT gasket.

[0077] 6. By driving the arc welding torch as a whole to move or by driving the fire rod 500 to move relative to the OT pad through the first driving component 200, the OT pad can be separated from the mounting seat 810 on the arc welding torch.

[0078] 7. The control module 300 controls the first driving component 200 to drive the connecting rod 210 to move backward to its other end (rear end) and abut against the switch component 310. The backward movement distance is the second distance, and the value of the second distance is greater than the value of the first distance.

[0079] 8. The switch 310 generates a signal and controls the first drive 200 through the control module 300 to move the connecting rod 210 forward, thereby moving the live wire rod 500 forward by a preset amount, so that the live wire rod 500 returns to its initial position.

[0080] It should be noted that when the part to be pulled 820 is a stud, the process of welding the stud to the sheet metal using the arc welding gun of this application connected to the welding machine and driving the fire wire rod 500 to reset is the same as the process described above when the part to be pulled 820 is a stud, so it will not be described again here.

[0081] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A drawn arc welding torch characterized by: The shell piece (100) is provided with a mounting cavity, and a first hole (110) and a second hole (120) which are both communicated with the mounting cavity, the first hole (110) and the second hole (120) are respectively provided with a ground wire rod (400) and a live wire rod (500), the ground wire rod (400) and the live wire rod (500) are both arranged along the front-back direction, and both ends of the ground wire rod (400) and the live wire rod (500) are respectively arranged in the outside and the mounting cavity; The first driving piece (200) is arranged in the mounting cavity, the first driving piece (200) is provided with a connecting rod (210), one end of the connecting rod (210) is connected with the live wire rod (500) at one end of the mounting cavity, and the first driving piece (200) can drive the connecting rod (210) to move forward or backward, so as to drive the live wire rod (500) to move forward or backward correspondingly; The control module (300) is arranged in the mounting cavity, the control module (300) is electrically connected with the first driving piece (200), and the control module (300) is provided with a switching piece (310), wherein the control module (300) can control the first driving piece (200) to drive the connecting rod (210) to move backward to the other end of the connecting rod (210) to abut against the switching piece (310), so that the control module (300) controls the first driving piece (200) to drive the live wire rod (500) to move forward by a preset amount to an initial position.

2. The arc striking welding gun according to claim 1, wherein the control module (300) is provided with an indicating lamp (320), the shell piece (100) is provided with a third hole (130), and the indicating lamp (320) is arranged through the third hole (130) to expose to the outside.

3. The arc striking welding gun according to claim 1, wherein the shell piece (100) is provided with a fourth hole, the fourth hole is rotatably arranged through a sleeve (610), and a sleeve cavity of the sleeve (610) is communicated with the outside and the mounting cavity to enable wiring to pass through the sleeve.

4. The arc striking welding gun according to claim 1, wherein the ground wire rod (400) is slidably arranged through the first hole (110), the shell piece (100) is provided with a sliding groove (140) located in the mounting cavity, a part of the ground wire rod (400) located in the mounting cavity is sleeved with a sliding block (620) and a first elastic piece (630), the sliding block (620) can slide with the ground wire rod (400), the sliding block (620) is slidably arranged in the sliding groove (140), and one end of the first elastic piece (630) abuts against the shell piece (100), and the other end of the first elastic piece (630) abuts against the sliding block (620).

5. The arc striking welding gun according to claim 4, wherein the sliding block (620) is provided with a fifth hole (621) and a sixth hole (622) which are communicated, the sliding block (620) is sleeved with the ground wire rod (400) through the fifth hole (621), and the sixth hole (622) is used for arranging an electric wire to pass through to enable the electric wire to be electrically connected with the ground wire rod (400). ​ 6. The arc striking welding torch according to claim 4, characterized in that: the mounting cavity is provided with a locking assembly (700) capable of locking the ground rod (400) to limit its sliding.

7. The arc striking welding torch according to claim 6, characterized in that: the part of the mounting cavity where the ground rod (400) is located is provided with a tooth portion (410), and the locking assembly (700) comprises: a swing member (710) rotationally connected to the mounting cavity, the swing member (710) being provided with a gap (711) through which the ground rod (400) passes; a second driving member (720) provided in the mounting cavity, an output end of the second driving member (720) being connected to the swing member (710), the second driving member (720) being capable of driving the swing member (710) to rotate to a avoiding state or a locking state, wherein, when the swing member (710) is in the avoiding state, the ground rod (400) can slide in the gap (711), when the swing member (710) is in the locking state, the swing member (710) is clamped with the tooth portion (410) to limit the sliding of the ground rod (400).

8. The arc striking welding torch according to claim 1, characterized in that: the front end of the live rod (500) is provided with a seventh hole (510) arranged along the length direction thereof, the seventh hole (510) being used for detachably inserting a connecting column (811) of a group of pieces to be drawn (800).

9. The arc striking welding torch according to claim 8, characterized in that: the front end of the live rod (500) is provided with at least two clamping pieces (520) arranged around the axis of the seventh hole (510) to jointly enclose a passing space, and the at least two clamping pieces (520) are threadedly provided with a locking member (640), wherein, when the connecting column (811) of the group of pieces to be drawn (800) is sequentially inserted into the passing space and the seventh hole (510), rotating the locking member (640) can make the at least two clamping pieces (520) jointly clamp the connecting column (811) of the group of pieces to be drawn (800).

10. The arc striking welding torch according to claim 8, characterized in that: the live rod (500) is provided with a gas passage (530) in communication with the seventh hole (510), and a connecting pipe member (540) in the mounting cavity in communication with the gas passage (530), the connecting pipe member (540) being capable of being connected with a pipe for conveying protective gas, so that the inner cavity of the pipe, the inner cavity of the connecting pipe member (540), the gas passage (530) and the seventh hole (510) are sequentially communicated.

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