Aluminum alloy arc welding device based on CMT cold metal transfer and working method thereof

Abstract

The present invention discloses an aluminum alloy arc welding device based on CMT cold metal transition and a working method thereof, which relates to the technical field of CMT welding devices, and is intended to solve the problem that the existing CMT welding devices mainly adopt the traditional straight-line wire feeding method for welding, and the weld size is too small for the part with higher connection strength requirements, which is easy to reduce the strength of the welded joint. It includes an electric turntable and a support, which is installed above the electric turntable, a first transmission arm is installed on one side of the upper end of the support, a transmission seat is installed on the side of one end of the first transmission arm, a connecting rod is installed on the outer wall of the transmission seat, a U-shaped support is installed at one end of the connecting rod, and a second transmission arm is installed at one end of the U-shaped support; a micro-transmission mechanism, which is installed at one end of the second transmission arm; a CMT welding head, which is installed at the output end of the micro-transmission mechanism, and two CMT welding heads are provided, and the two CMT welding heads are arranged oppositely.

Description

Technical Field

[0001] The invention relates to the technical field of CMT welding devices, and in particular to an aluminum alloy arc welding device based on CMT cold metal transfer and a working method thereof. Background Art

[0002] CMT technology is a welding technology that digitally coordinates the wire feeding and droplet transfer processes. CMT arc welding has low current, low heat input, low spatter and post-weld deformation, and high metallurgical quality of the weld metal. This method is particularly suitable for thin plate welding. Since the CMT transition mode is different from ordinary MIG / MAG welding, its composite mode and composite effect are also changed.

[0003] Existing CMT welding devices, such as announcement number CN215469111U, are named as a CMT cold transition welding device for a car power battery cover, including a base, a control host, a robotic arm and a welding gun. The control host and the robotic arm are both arranged on the upper surface of the base, and the welding gun is fixedly installed at the end of the robotic arm. A support plate is horizontally provided on the right side of the robotic arm, and the four corners of the lower surface of the support plate are fixedly installed on the upper surface of the base through support rods. A battery cover is provided above the support plate, and a clamping mechanism for fixing the battery cover is provided on the support plate.

[0004] The existing CMT welding device mainly adopts the traditional straight-line welding method. For the parts with higher connection strength requirements, the weld size is too small, which can easily reduce the strength of the welded joint. Therefore, we provide an aluminum alloy arc welding device based on CMT cold metal transfer and its working method. Summary of the invention

[0005] The purpose of the present invention is to provide an aluminum alloy arc welding device based on CMT cold metal transition and a working method thereof, so as to solve the problem that the existing CMT welding device proposed in the above background technology mainly adopts the traditional straight line welding method, and the weld size is too small for the part with higher connection strength requirements, which easily reduces the strength of the weld joint.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an aluminum alloy arc welding device based on CMT cold metal transfer, comprising an electric turntable;

[0007] Also includes:

[0008] A support, which is installed above the electric turntable, a first transmission arm is installed on one side of the upper end of the support, a transmission seat is installed on the side of one end of the first transmission arm, a connecting rod is installed on the outer wall of the transmission seat, a U-shaped support is installed on one end of the connecting rod, and a second transmission arm is installed on one end of the U-shaped support;

[0009] A micro-motion transmission mechanism, which is mounted on one end of the second transmission arm;

[0010] A CMT welding head is installed on the output end of the micro-transmission mechanism. Two CMT welding heads are provided and the two CMT welding heads are arranged opposite to each other.

[0011] Preferably, a slide groove is provided inside the micro-transmission mechanism, a transmission block is provided inside the slide groove, and one end of the transmission block is fixedly connected to the CMT welding head, a driving eccentric gear is provided at the middle position of the upper end of the transmission block, an eccentric connecting shaft is installed on the outer wall of the driving eccentric gear, a servo motor is installed on the outer wall of the micro-transmission mechanism, and the output end of the servo motor is transmission-connected to the eccentric connecting shaft, one side of the driving eccentric gear is meshedly connected to the first driven eccentric gear, and the other side of the driving eccentric gear is meshedly connected to the second driven eccentric gear, and the first driven eccentric gear and the second driven eccentric gear are both rotationally connected to the transmission block through the eccentric rotating shaft;

[0012] The micro-transmission mechanism is connected to the CMT welding head. During the movement, the servo motor on the micro-transmission mechanism runs to control the rotation of the active eccentric gear, which engages and transmits with the driven eccentric gears on both sides. The continuous eccentric rotation of the driven eccentric gears on both sides will drive the transmission block connected to it to move back and forth along the slide slot, thereby driving the two sets of CMT welding heads to follow the device to move linearly along the weld, while increasing the lateral reciprocating motion, so that the traditional linear strip transport welding method is changed to a staggered strip transport welding method.

[0013] Preferably, a detection seat is installed at the front end of the CMT welding head, an inclined seat is provided at the middle position of the front end of the detection seat, and a weld scanner is installed on the outer wall of the inclined seat.

[0014] Preferably, brackets are provided on both sides of the tilting seat, and the brackets are fixedly connected to the detection seat, and a laser rangefinder is installed at one end of the bracket.

[0015] Preferably, guide rod supports are installed above and below one end of the transmission block, a first guide rod is installed on the inner wall of the upper guide rod support, and one end of the first guide rod passes through and extends to the outside of the second transmission arm, a second guide rod is installed on the inner wall of the lower guide rod support, a bearing seat is provided on the outer wall of the second guide rod, and the bearing seat is fixedly connected to the lower end of the micro-transmission mechanism.

[0016] Preferably, a first bearing is installed at the connection between the first guide rod and the second transmission arm, a second bearing is installed at the connection between the second guide rod and the bearing seat, and a limit block is installed at one end of the first guide rod and the second guide rod.

[0017] Preferably, the support is transmission connected to one end of the first transmission arm through a first stepper motor, the other end of the first transmission arm is transmission connected to the transmission seat through a second stepper motor, and the front end of the connecting rod is transmission connected to the U-shaped support through a built-in motor.

[0018] Preferably, a transmission cover is installed on one side of the outer wall of the U-shaped support, a driven sprocket is installed at one end inside the transmission cover, and the axle of the driven sprocket is transmission connected to the second transmission arm, a driving sprocket is installed at the other end inside the transmission cover, the driving sprocket is transmission connected to the driven sprocket through a chain belt, a third stepper motor is installed on the outer wall of the transmission cover, the output end of the third stepper motor passes through and extends to the interior of the transmission cover, and is transmission connected to the driving sprocket.

[0019] Preferably, a base is installed on the lower surface of the electric turntable, and shock-absorbing support feet are installed at the four corners of the lower end of the base.

[0020] Preferably, a working method of an aluminum alloy arc welding device based on CMT cold metal transfer comprises the following steps:

[0021] Step 1: The loading equipment moves the two sets of plates to be welded to the predetermined positions, and the CMT welding head is controlled to move to the welding position of the joint of the two sets of plates through the rotation cooperation among the electric turntable, the first transmission arm, the transmission seat, the connecting rod, the U-shaped support and the second transmission arm;

[0022] Step 2: Before welding, the weld scanner on the detection seat detects the subsequent weld position at a certain inclination angle, and the two sets of laser rangefinders on the detection seat determine the flatness of the two sets of plate assembly based on laser distance measurement. After the flatness and weld position are confirmed to be correct, the controller controls the device to operate based on a predetermined program to move the CMT welding head along the weld;

[0023] Step 3: During the movement, different welding methods are enabled according to the welding requirements of the plate. One is the operation of the micro-transmission mechanism. The servo motor on the micro-transmission mechanism controls the rotation of the active eccentric gear, which meshes with the driven eccentric gears on both sides. The continuous eccentric rotation of the driven eccentric gears on both sides will drive the transmission blocks connected to the rotation thereof to reciprocate and extend along the slide slot, thereby driving the two groups of CMT welding heads to follow the device to move linearly along the weld seam, while increasing the lateral reciprocating motion, so that the traditional linear wire feeding welding method is changed to the staggered wire feeding welding method, and during the welding process, the two groups of CMT welding heads alternately start arcs, and use the wire feeding motion and the molten droplet transition for digital coordination to ensure the stability of the arc during the welding process. The second is the stop of the micro-transmission mechanism, and the device drives the two groups of CMT welding heads to move linearly along the weld seam. During the process, the two groups of CMT welding heads efficiently alternately start arcs to shorten the welding interval;

[0024] Step 4: During the welding process, if the weld scanner or laser rangefinder on the detection seat detects that the weld position is offset or the flatness of the two sets of plates is uneven, it will feedback the signal to the terminal, sound an alarm and stop the operation to wait for subsequent maintenance to reduce operating losses.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention connects the micro-motion transmission mechanism with the CMT welding head. During the welding process, if the key plate has a high strength requirement, the servo motor on the micro-motion transmission mechanism runs to control the rotation of the active eccentric gear, which meshes with the driven eccentric gears on both sides. The driven eccentric gears on both sides continue to rotate eccentrically, which drives the transmission blocks connected to them to move back and forth along the slide slot, thereby driving the two groups of CMT welding head following devices to move linearly along the weld, while increasing the lateral reciprocating motion, so that the traditional straight-line welding method is changed to a staggered welding method, thereby increasing the welding range and enhancing the welding firmness. This solves the problem that the existing CMT welding device mainly adopts the traditional straight-line welding method for welding, and the weld size is too small for the part with high connection strength requirement, which is easy to reduce the strength of the welded joint.

[0027] 2. For non-critical node plates, the device can also use traditional linear straight bar welding. During the process, two sets of CMT welding heads efficiently and alternately start arcs, shortening the welding interval to improve welding efficiency, reduce consumables, reduce welding costs, and improve the flexibility of the device.

[0028] 3. The double CMT welding head design is adopted. During the welding process, two groups of CMT welding heads start arcs alternately, and the wire feeding movement is digitally coordinated with the molten droplet transition to achieve the molten droplet transition in the state of no current at a frequency of 1.5-5.0 GHz. The wire feeding and retraction in the short-circuit state realizes the separation of the welding wire and the molten droplet, so as to ensure the stability of the arc during the welding process, reduce the welding heat by 20-30%, and the weld surface is nearly 100% spatter-free, reducing or even eliminating the need for manual rework and maintenance.

[0029] 4. By setting a detection seat on the CMT welding head, the "inspection before welding" operation mode is adopted. Before welding, the weld scanner on the detection seat detects the subsequent weld position at a certain inclination angle, and the two sets of laser rangefinders on the detection seat judge the flatness of the two sets of plate parts based on laser ranging. After the flatness and weld position are confirmed to be correct, the controller controls the device to run based on a predetermined program to move the CMT welding head along the weld. During the welding process, if the weld scanner or laser rangefinder on the detection seat detects that the weld position is offset or the flatness of the two sets of plates is different, it will feedback a signal to the terminal, issue an alarm and stop the operation to wait for subsequent maintenance to reduce operation losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the back structure of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of A of the present invention;

[0033] Figure 4 It is a schematic diagram of the internal structure of the micro-motion transmission mechanism of the present invention;

[0034] Figure 5 It is a schematic diagram of the internal structure of the transmission cover of the present invention;

[0035] In the figure: 1, electric turntable; 2, base; 3, shock-absorbing support foot; 4, support; 5, first transmission arm; 6, transmission seat; 7, connecting rod; 8, U-shaped support; 9, second transmission arm; 10, micro-transmission mechanism; 101, slide; 102, transmission block; 103, first driven eccentric gear; 104, second driven eccentric gear; 105, eccentric rotation shaft; 106, active eccentric gear; 107, eccentric connecting shaft; 11, first stepper motor; 12, Second stepper motor; 13. Transmission cover; 14. Third stepper motor; 15. Servo motor; 16. CMT welding head; 17. Guide rod support; 18. First guide rod; 19. First bearing; 20. Second guide rod; 21. Bearing seat; 22. Second bearing; 23. Limit block; 24. Detection seat; 25. Bracket; 26. Laser rangefinder; 27. Tilt seat; 28. Weld scanner; 29. ​​Driving sprocket; 30. Driven sprocket; 31. Chain belt. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Example 1

[0038] See also Figure 1-5 , an aluminum alloy arc welding device based on CMT cold metal transfer, comprising an electric turntable 1;

[0039] Also includes:

[0040] A support 4 is mounted above the electric turntable 1, a first transmission arm 5 is mounted on one side of the upper end of the support 4, a transmission seat 6 is mounted on the side of one end of the first transmission arm 5, a connecting rod 7 is mounted on the outer wall of the transmission seat 6, a U-shaped support 8 is mounted on one end of the connecting rod 7, and a second transmission arm 9 is mounted on one end of the U-shaped support 8;

[0041] A micro-motion transmission mechanism 10, which is mounted at one end of the second transmission arm 9;

[0042] The CMT welding head 16 is installed on the output end of the micro-transmission mechanism 10 . There are two CMT welding heads 16 , and the two CMT welding heads 16 are arranged opposite to each other.

[0043] See also Figure 3 and Figure 4 The micro-transmission mechanism 10 is provided with a slide groove 101 inside, a transmission block 102 is provided inside the slide groove 101, and one end of the transmission block 102 is fixedly connected to the CMT welding head 16, and an active eccentric gear 106 is provided at the middle position of the upper end of the transmission block 102, and an eccentric connecting shaft 107 is installed on the outer wall of the active eccentric gear 106. A servo motor 15 is installed on the outer wall of the micro-transmission mechanism 10, and the output end of the servo motor 15 is transmission-connected to the eccentric connecting shaft 107, one side of the active eccentric gear 106 is meshedly connected with the first driven eccentric gear 103, and the other side of the active eccentric gear 106 is meshedly connected with the first driven eccentric gear 103. The second driven eccentric gear 104 is meshedly connected to the side, and the first driven eccentric gear 103 and the second driven eccentric gear 104 are both rotatably connected to the transmission block 102 through the eccentric rotating shaft 105. The servo motor 15 on the micro-transmission mechanism 10 runs to control the rotation of the active eccentric gear 106, which meshes and transmits with the driven eccentric gears on both sides. Under the continuous eccentric rotation movement of the driven eccentric gears on both sides, the transmission block 102 rotatably connected to it will be driven to reciprocate and telescope along the slide groove 101. The range of motion depends on the wheel diameter of the eccentric gear, so that the CMT welding head 16 can reciprocate and stagger welding, thereby increasing the welding range.

[0044] See also Figure 3 A detection seat 24 is installed at the front end of the CMT welding head 16, and a tilting seat 27 is set in the middle position of the front end of the detection seat 24. A weld scanner 28 is installed on the outer wall of the tilting seat 27. The weld scanner 28 is based on an ultrasonic probe. It detects the position of the weld by measuring the propagation speed and reflection intensity of the ultrasonic wave in the material, and judges in advance whether the subsequent welding process will be offset.

[0045] See also Figure 3 A bracket 25 is provided on both sides of the tilting seat 27, and the bracket 25 is fixedly connected to the detection seat 24. A laser rangefinder 26 is installed at one end of the bracket 25. Two groups of laser rangefinders 26 are provided. During welding, they can be located on both sides of the weld to detect the flatness of the plate pairs at the position to be welded in advance to ensure the subsequent welding quality.

[0046] See also Figure 3A guide rod support 17 is installed above and below one end of the transmission block 102, a first guide rod 18 is installed on the inner wall of the upper guide rod support 17, and one end of the first guide rod 18 passes through and extends to the outside of the second transmission arm 9, a second guide rod 20 is installed on the inner wall of the lower guide rod support 17, a bearing seat 21 is provided on the outer wall of the second guide rod 20, and the bearing seat 21 is fixedly connected to the lower end of the micro-transmission mechanism 10. During the reciprocating micro-motion process of the transmission block 102 in the micro-transmission mechanism 10, the first guide rod 18 and the second guide rod 20 can slide with the second transmission arm 9 and the bearing seat 21 respectively, playing a role of auxiliary guidance, so as to improve the movement stability, ensure its service life, and avoid its deviation.

[0047] See also Figure 3 A first bearing 19 is installed at the connection between the first guide rod 18 and the second transmission arm 9, a second bearing 22 is installed at the connection between the second guide rod 20 and the bearing seat 21, and a limiting block 23 is installed at one end of the first guide rod 18 and the second guide rod 20. The bearings can improve the activity accuracy of the first guide rod 18 and the second guide rod 20, thereby ensuring the welding accuracy to a certain extent.

[0048] See also Figure 1 The support 4 is connected to one end of the first transmission arm 5 through the first stepper motor 11, the other end of the first transmission arm 5 is connected to the transmission seat 6 through the second stepper motor 12, the front end of the connecting rod 7 is connected to the U-shaped support 8 through the built-in motor, and the support 4, the first transmission arm 5, the transmission seat 6, the connecting rod 7 and the U-shaped support 8 are connected by the motor transmission, so the processing angle can be flexibly adjusted.

[0049] See also Figure 1 and Figure 5 A transmission cover 13 is installed on one side of the outer wall of the U-shaped support 8, a driven sprocket 30 is installed at one end inside the transmission cover 13, and the axle of the driven sprocket 30 is connected to the second transmission arm 9, a driving sprocket 29 is installed at the other end inside the transmission cover 13, and the driving sprocket 29 is connected to the driven sprocket 30 through a chain belt 31, and a third stepper motor 14 is installed on the outer wall of the transmission cover 13, the output end of the third stepper motor 14 passes through and extends to the inside of the transmission cover 13, and is connected to the driving sprocket 29, the third stepper motor 14 can drive the driving sprocket 29 to rotate, and transmit the transmission to the driven sprocket 30 through the chain belt 31, thereby driving the second transmission arm 9 to rotate, so as to achieve the effect of accurately adjusting the welding angle.

[0050] See also Figure 1 A base 2 is installed on the lower surface of the electric turntable 1, and shock-absorbing support feet 3 are installed at the four corners of the lower end of the base 2. The shock-absorbing support feet 3 are made of rubber material, so that the bottom center of the base 2 is floating, reducing vibration conduction, achieving a good shock-absorbing effect, and improving the operation stability of the device.

[0051] See also Figure 1-5 , a working method of an aluminum alloy arc welding device based on CMT cold metal transfer, comprising the following steps:

[0052] Step 1: The loading equipment moves the two sets of plates to be welded to the predetermined positions, and the CMT welding head 16 is controlled to move to the welding position of the joint of the two sets of plates through the rotation cooperation among the electric turntable 1, the first transmission arm 5, the transmission seat 6, the connecting rod 7, the U-shaped support 8 and the second transmission arm 9;

[0053] Step 2: Before welding, the weld scanner 28 on the detection seat 24 detects the subsequent weld position at a certain inclination angle, and the two sets of laser rangefinders 26 on the detection seat 24 determine the flatness of the two sets of plate assembly based on laser distance measurement. After the flatness and weld position are confirmed to be correct, the controller controls the device to operate based on a predetermined program to move the CMT welding head 16 along the weld;

[0054] Step 3: During the movement, different welding methods are enabled according to the welding requirements of the plate. If the plate is a key node with high strength requirements, the micro-transmission mechanism 10 is operated, and the servo motor 15 on the micro-transmission mechanism 10 controls the active eccentric gear 106 to rotate, and meshes with the driven eccentric gears on both sides for transmission. The driven eccentric gears on both sides continue to rotate eccentrically, which will drive the transmission block 102 connected to it to move back and forth along the slide 101, thereby driving the two groups of CMT welding heads 16 to follow the device to move linearly along the weld, while increasing the lateral reciprocating motion, so that the traditional linear wire feeding welding method is changed to a staggered wire feeding welding method, and during the welding process, the two groups of CMT welding heads 16 alternately start arcs, and use the wire feeding motion and the droplet transition for digital coordination to ensure the stability of the arc during welding, and increase the welding range while greatly improving the welding strength;

[0055] Step 4: During the welding process, if the weld scanner 28 or laser rangefinder 26 on the detection seat 24 detects that the weld position is offset or the flatness of the two sets of plates is different, it will feedback a signal to the terminal, sound an alarm and stop the operation to wait for subsequent maintenance to reduce operating losses.

[0056] Example 2

[0057] See also Figure 1-5 , an aluminum alloy arc welding device based on CMT cold metal transfer, comprising an electric turntable 1;

[0058] Also includes:

[0059] A support 4 is installed above the electric turntable 1, a first transmission arm 5 is installed on one side of the upper end of the support 4, a transmission seat 6 is installed on the side of one end of the first transmission arm 5, a connecting rod 7 is installed on the outer wall of the transmission seat 6, a U-shaped support 8 is installed at one end of the connecting rod 7, and a second transmission arm 9 is installed at one end of the U-shaped support 8; a micro-transmission mechanism 10 is installed at one end of the second transmission arm 9; a CMT welding head 16 is installed on the output end of the micro-transmission mechanism 10, and two CMT welding heads 16 are provided, and the two CMT welding heads 16 are arranged opposite to each other.

[0060] See also Figure 3 and Figure 4 A slide groove 101 is provided inside the micro-transmission mechanism 10, a transmission block 102 is provided inside the slide groove 101, and one end of the transmission block 102 is fixedly connected to the CMT welding head 16, a driving eccentric gear 106 is provided at the middle position of the upper end of the transmission block 102, an eccentric connecting shaft 107 is installed on the outer wall of the driving eccentric gear 106, a servo motor 15 is installed on the outer wall of the micro-transmission mechanism 10, and the output end of the servo motor 15 is transmission-connected to the eccentric connecting shaft 107, one side of the driving eccentric gear 106 is meshedly connected to the first driven eccentric gear 103, and the other side of the driving eccentric gear 106 is meshedly connected to the second driven eccentric gear 104, and the first driven eccentric gear 103 and the second driven eccentric gear 104 are both rotationally connected to the transmission block 102 through the eccentric rotating shaft 105.

[0061] See also Figure 3 A detection seat 24 is installed at the front end of the CMT welding head 16, and a tilting seat 27 is arranged at the middle position of the front end of the detection seat 24. A weld scanner 28 is installed on the outer wall of the tilting seat 27. Brackets 25 are arranged on both sides of the tilting seat 27, and the brackets 25 are fixedly connected to the detection seat 24. A laser rangefinder 26 is installed at one end of the bracket 25, and two groups of laser rangefinders 26 are arranged.

[0062] See also Figure 1-5 , a working method of an aluminum alloy arc welding device based on CMT cold metal transfer, comprising the following steps:

[0063] Step 1: The loading equipment moves the two sets of plates to be welded to the predetermined positions, and the CMT welding head 16 is controlled to move to the welding position of the joint of the two sets of plates through the rotation cooperation among the electric turntable 1, the first transmission arm 5, the transmission seat 6, the connecting rod 7, the U-shaped support 8 and the second transmission arm 9;

[0064] Step 2: Before welding, the weld scanner 28 on the detection seat 24 detects the subsequent weld position at a certain inclination angle, and the two sets of laser rangefinders 26 on the detection seat 24 determine the flatness of the two sets of plate assembly based on laser distance measurement. After the flatness and weld position are confirmed to be correct, the controller controls the device to operate based on a predetermined program to move the CMT welding head 16 along the weld;

[0065] Step 3: During the movement, different welding methods are enabled according to the welding requirements of the plate. If the plate is a non-critical node, the micro-transmission mechanism 10 remains in a stopped state, and the device drives the two groups of CMT welding heads 16 to move linearly along the weld. During the process, the two groups of CMT welding heads 16 efficiently start arcs alternately, shortening the welding interval to improve welding efficiency, reduce consumables, and reduce welding costs;

[0066] Step 4: During the welding process, if the weld scanner 28 or the laser rangefinder 26 on the detection seat 24 detects that the weld position is offset or the flatness of the two sets of plates is different, it will feedback a signal to the terminal, sound an alarm and remain in a stopped state to continue working, waiting for subsequent maintenance to reduce operating losses.

[0067] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An aluminum alloy arc welding device based on CMT cold metal transfer, comprising an electric turntable (1); Features: Also includes: A support (4) is mounted above the electric turntable (1); a first transmission arm (5) is mounted on one side of the upper end of the support (4); a transmission seat (6) is mounted on the side of one end of the first transmission arm (5); a connecting rod (7) is mounted on the outer wall of the transmission seat (6); a U-shaped support (8) is mounted on one end of the connecting rod (7); and a second transmission arm (9) is mounted on one end of the U-shaped support (8); A micro-motion transmission mechanism (10) mounted on one end of the second transmission arm (9); A CMT welding head (16) mounted on the output end of the micro-transmission mechanism (10), wherein two CMT welding heads (16) are provided, and the two CMT welding heads (16) are arranged opposite to each other; The micro-motion transmission mechanism (10) is provided with a slide groove (101) inside, a transmission block (102) is provided inside the slide groove (101), and one end of the transmission block (102) is fixedly connected to the CMT welding head (16), an active eccentric gear (106) is provided at the middle position of the upper end of the transmission block (102), an eccentric connecting shaft (107) is installed on the outer wall of the active eccentric gear (106), and a servo drive shaft (107) is installed on the outer wall of the micro-motion transmission mechanism (10). A servo motor (15), wherein the output end of the servo motor (15) is transmission-connected to an eccentric connecting shaft (107); one side of the active eccentric gear (106) is meshingly connected to a first driven eccentric gear (103); the other side of the active eccentric gear (106) is meshingly connected to a second driven eccentric gear (104); the first driven eccentric gear (103) and the second driven eccentric gear (104) are both rotationally connected to a transmission block (102) via an eccentric rotating shaft (105); A detection seat (24) is installed at the front end of the CMT welding head (16); a tilting seat (27) is provided at the middle position of the front end of the detection seat (24); and a weld scanner (28) is installed on the outer wall of the tilting seat (27); Brackets (25) are provided on both sides of the tilting seat (27), and the brackets (25) are fixedly connected to the detection seat (24). A laser rangefinder (26) is installed at one end of the bracket (25).

2. The aluminum alloy arc welding device based on CMT cold metal transfer according to claim 1 is characterized in that: A guide rod support (17) is installed above and below one end of the transmission block (102); a first guide rod (18) is installed on the inner wall of the upper guide rod support (17), and one end of the first guide rod (18) penetrates and extends to the outside of the second transmission arm (9); a second guide rod (20) is installed on the inner wall of the lower guide rod support (17), a bearing seat (21) is provided on the outer wall of the second guide rod (20), and the bearing seat (21) is fixedly connected to the lower end of the micro-motion transmission mechanism (10).

3. The aluminum alloy arc welding device based on CMT cold metal transfer according to claim 2, characterized in that: A first bearing (19) is installed at the connection between the first guide rod (18) and the second transmission arm (9), a second bearing (22) is installed at the connection between the second guide rod (20) and the bearing seat (21), and a limit block (23) is installed at one end of each of the first guide rod (18) and the second guide rod (20).

4. The aluminum alloy arc welding device based on CMT cold metal transfer according to claim 3 is characterized in that: The support (4) is transmission-connected to one end of the first transmission arm (5) via a first stepper motor (11); the other end of the first transmission arm (5) is transmission-connected to the transmission seat (6) via a second stepper motor (12); and the front end of the connecting rod (7) is transmission-connected to the U-shaped support (8) via a built-in motor.

5. The aluminum alloy arc welding device based on CMT cold metal transfer according to claim 4 is characterized in that: A transmission cover (13) is mounted on one side of the outer wall of the U-shaped support (8); a driven sprocket (30) is mounted on one end of the transmission cover (13); and the axle of the driven sprocket (30) is in transmission connection with the second transmission arm (9); a driving sprocket (29) is mounted on the other end of the transmission cover (13); the driving sprocket (29) is in transmission connection with the driven sprocket (30) via a chain belt (31); a third stepping motor (14) is mounted on the outer wall of the transmission cover (13); an output end of the third stepping motor (14) penetrates and extends into the interior of the transmission cover (13) and is in transmission connection with the driving sprocket (29).

6. The aluminum alloy arc welding device based on CMT cold metal transfer according to claim 5, characterized in that: A base (2) is installed on the lower surface of the electric turntable (1), and shock-absorbing support feet (3) are installed at the four corners of the lower end of the base (2).

7. A working method of an aluminum alloy arc welding device based on CMT cold metal transfer, which is implemented based on the aluminum alloy arc welding device based on CMT cold metal transfer according to claim 6, characterized in that: The following steps are involved: Step 1: The loading device moves two sets of plates to be welded to a predetermined position, and controls the CMT welding head (16) to move to the welding position where the two sets of plates are joined by the rotational cooperation among the electric turntable (1), the first transmission arm (5), the transmission seat (6), the connecting rod (7), the U-shaped support (8) and the second transmission arm (9); Step 2: Before welding, a weld scanner (28) on the detection seat (24) detects the subsequent weld position at a certain inclination angle, and two sets of laser rangefinders (26) on the detection seat (24) determine the flatness of the two sets of plate assembly based on laser distance measurement. After the flatness and weld position are confirmed to be correct, the controller controls the device to operate based on a predetermined program, so that the CMT welding head (16) moves along the weld; Step 3: During the movement, different welding methods are activated according to the welding requirements of the plate. One is that the micro-transmission mechanism (10) is operated, and the servo motor (15) on the micro-transmission mechanism (10) controls the active eccentric gear (106) to rotate, and meshes with the driven eccentric gears on both sides for transmission. The continuous eccentric rotation of the driven eccentric gears on both sides will drive the transmission block (102) connected to the rotation thereof to reciprocate and extend along the slide groove (101), thereby driving the two groups of CMT welding heads (16) to follow the device to move linearly along the weld seam, while increasing the lateral reciprocating movement, so that the traditional linear wire feeding welding method is changed to a staggered wire feeding welding method, and during the welding process, the two groups of CMT welding heads (16) alternately start arcs, and use the wire feeding movement and the molten droplet transition to perform digital coordination to ensure the stability of the arc during the welding process. The second is that the micro-transmission mechanism (10) stops, and the device drives the two groups of CMT welding heads (16) to move linearly along the weld seam. During the process, the two groups of CMT welding heads (16) efficiently alternately start arcs, shortening the welding interval. Step 4: During the welding process, if the weld scanner (28) or laser rangefinder (26) on the detection seat (24) detects that the weld position is offset or the flatness of the two sets of plates is different, it will feedback a signal to the terminal, sound an alarm and stop the operation to wait for subsequent maintenance, thereby reducing operation losses.

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