Aluminum sheet metal part hot welding system and welding method

Abstract

The invention relates to the technical field of aluminum sheet metal hot welding, and particularly discloses an aluminum sheet metal hot welding system and welding method.The aluminum sheet metal hot welding system comprises a welding rod, a welding gun located outside a notch is fixedly installed at one end of the welding rod, an arc-shaped piece is fixedly installed at the other end of the welding rod, and the arc-shaped piece is in coupling transmission with a rotating shaft and limiting columns which are arranged on the two sides of a welding seam at equal intervals; and the end part of the single-side limiting column is attached to the side wall of the aluminum plate. The limiting columns distributed at equal intervals can be automatically matched with the arc shape of the outer wall of an aluminum plate, the guide rod is used for providing circumferential driving power for the arc-shaped piece, the welding rod is made to move in a fan shape with a molten pool as the circle center, the included angle between the welding gun and a welding seam is automatically adjusted, and curved surface information is directly transmitted through physical components; the welding seam after tungsten electrode and curved surface change is kept at a constant angle, the problems of arc blowing, abnormal argon coverage and the like are greatly reduced, and the quality of the welding seam is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to aluminum sheet metal hot welding technology, in particular to an aluminum sheet metal hot welding system and welding method. BACKGROUND

[0002] Aluminum sheet metal welding usually adopts argon arc welding, because argon arc welding can solve the problem of aluminum oxidation through argon protection, and precise heat input can meet the low melting point of aluminum, flexibly adapt to the complexity of sheet metal structure, and also make the weld considerate of aesthetics and high strength, which is the industry standard method.

[0003] For example, publication (announcement) No. CN105618902A, published (announced) on June 1, 2016, discloses a thin-walled aluminum alloy sheet metal product automatic argon arc welding machine, which comprises a wire feeding and arc striking system, a welding sheet metal jig device, and an x-y motion platform device. The welding sheet metal jig device is placed on the x-y motion platform device. The wire feeding and arc striking system comprises a wire feeding drive device.

[0004] The deficiency of the prior art is that outdoor independent large decorative buildings usually install some decorative aluminum plate parts, and in order to meet the diversity of decoration, the plate parts have continuous irregular arc surfaces, so welding the plate parts is manual. Because there are many outdoor operation interference factors, the workshop completes the welding in the factory building after receiving the order, and delivers the finished product to the site for assembly, and if the finished product is damaged during delivery, the site can use welding to repair, which is also a test of the qualified rate of the finished product. Before the workshop finishes the welding of the finished product, the multiple arc plate parts constituting the finished product are assembled and welded again, and the small components are combined into large components, and finally the finishing welding is performed. However, because the volume of the assembled finished product is large, hoisting equipment or manned equipment is needed to enable the worker to approach the finishing weld. Therefore, manual welding of such large aluminum plate finished product not only requires skilled workers to operate, but also needs to pay attention to the protection of the plate parts. When hoisting equipment or manned equipment is involved, the difficulty of manual operation increases, and the quality of the weld is difficult to guarantee, especially for welding large curvature surfaces, the angle of the welding gun cannot be adjusted in time, so that the angle of argon gas spraying changes with the curvature, causing arc blow, abnormal argon coverage, easy to cause the molten pool to be exposed, and aggravate oxidation and smoke generation, affecting the quality of the weld. SUMMARY

[0005] The purpose of the present application is to provide an aluminum sheet metal hot welding system and welding method to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] An aluminum sheet metal part hot welding system, comprising a mechanical arm provided with an extension arm, a welding cover with a notch fixedly installed at the end of the extension arm, and further comprising:

[0008] A welding rod, one end of which is fixedly installed with a welding gun outside the notch, and the other end is fixedly installed with an arc-shaped part, and the arc-shaped part is coupled and driven by a rotating shaft;

[0009] Limiting columns are arranged equidistantly on both sides of the welding seam, and the end of the single-sided limiting column is in close contact with the side wall of the aluminum plate, wherein:

[0010] When the limiting column is driven and pushes the rotating shaft to rotate, the arc-shaped part moves along the predetermined arc-shaped path.

[0011] As a further description of the above technical solution: further comprising a welding frame for installing the welding rod, and the welding frame is fixedly installed with a roller frame symmetrically distributed on both sides of the welding gun movement path.

[0012] As a further description of the above technical solution: the end of the limiting column is fixedly installed with an elastic sheet for resisting the sliding of the workpiece.

[0013] As a further description of the above technical solution: further comprising a swing rod in transmission connection with the rotating shaft, and the swing rod is in sliding assembly with a plurality of limiting columns.

[0014] As a further description of the above technical solution: further comprising a transfer bar arranged between the rotating shaft and the swing rod, and the transfer bar is provided with an inclined surface for pushing the rotating shaft and adjusting the rotation angle of the rotating shaft.

[0015] As a further description of the above technical solution: the transfer bar is provided with an elastic member, which is in a force storage state by default, and in this state, the transfer bar is in contact with the rotating shaft.

[0016] As a further description of the above technical solution: the end of the welding frame is fixedly installed with a curved plate, and the inclined surface on the transfer bar is in sliding connection with the surface of the curved plate.

[0017] As a further description of the above technical solution: the welding frame is fixedly installed with an arc-shaped frame outside the rotating shaft.

[0018] As a further description of the above technical solution: a plurality of openings are formed in the side wall of the welding cover, which are communicated with the gaps between adjacent limiting columns.

[0019] An aluminum sheet metal part hot welding method, comprising the aluminum sheet metal part hot welding system of any one of the above, and further comprising the following steps:

[0020] S1, use a stainless steel wire brush to physically polish along the plate welding area, and then use a acetone and isopropyl alcohol soaked lint cloth to wipe the polished position;

[0021] S2, after the plate is chemically degreased, the welding area is blown dry using a hot air gun;

[0022] S3, the mechanical arm, the extension arm and the equipment and parts in the welding cover are checked;

[0023] S4, the workpiece is fixed, and the corresponding fixing tool is fixed and protected;

[0024] S5, the hot air gun is used to preheat the welding area;

[0025] S6, the welding cover is moved to the welding seam by the mechanical arm and the extension arm, and the tungsten electrode on the welding gun is above the molten pool, the argon valve is opened first, the argon is covered on the welding seam position, and then the power is turned on and the welding work is carried out;

[0026] S7, the welding seam is cleaned using a steel wire brush and an aluminum welding seam special cleaner;

[0027] S8, the fixing tool for protecting the workpiece is removed.

[0028] In the above technical solution, the aluminum sheet metal part hot welding system and the welding method provided by the application have the following beneficial effects: during the welding process, the equidistant distribution of the limiting column can automatically adapt to the arc shape of the outer wall of the aluminum plate, and the guide rod can provide circumferential driving power to the arc-shaped part, so that the welding rod moves in a fan-shaped path, and the center is located in the welding pool, so that the welding gun adjusts the included angle with the welding seam, realizes the direct transmission of curved surface information by physical components, generates corresponding power, adjusts the welding angle of the welding gun, keeps the angle of the tungsten electrode and the changed welding seam constant, greatly reduces the problems of arc blow, argon coverage abnormality and the like, guarantees the welding quality, and improves the welding production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0030] Figure 1 The aluminum plate and the welding cover mounted on the outer side thereof by the mechanical arm and the extension arm provided by the embodiment of the application are assembled schematically.

[0031] Figure 2 The welding seam between adjacent aluminum plates and the welding cover assembly schematic diagram provided by the embodiment of the application;

[0032] Figure 3 The working end surface of the welding cover and the internal parts thereof provided by the embodiment of the application are schematically shown.

[0033] Figure 4 The welding cover section and the plurality of limiting columns and the welding seam position assembly schematic diagram provided by the embodiment of the present application;

[0034] Figure 5 The empty shell schematic diagram of the welding cover working surface provided by the embodiment of the present application;

[0035] Figure 6 The plurality of limiting columns and the swing rod assembly schematic diagram provided by the embodiment of the present application;

[0036] Figure 7 The welding rod provided with the welding gun and the frame and the roller frame assembly schematic diagram thereon provided by the embodiment of the present application;

[0037] Figure 8 The welding rod provided with the welding gun and the frame and the gear assembly schematic diagram thereon provided by the embodiment of the present application;

[0038] Figure 9 The welding rod provided with the welding gun and the frame and the gear rear section schematic diagram thereon provided by the embodiment of the present application;

[0039] Figure 10 The swing shaft provided with the auxiliary turning plate and the swing rod provided with the main turning plate and the intermediate transfer bar assembly schematic diagram provided by the embodiment of the present application;

[0040] Figure 11 The A enlarged schematic diagram of Figure 10 ;

[0041] Figure 12 The auxiliary turning plate, the main turning plate and the intermediate transfer bar assembly rear section schematic diagram provided by the embodiment of the present application;

[0042] Figure 13 The B enlarged schematic diagram of Figure 12 ;

[0043] Figure 14 The auxiliary turning plate, the main turning plate and the intermediate transfer bar assembly rear section schematic diagram provided by the embodiment of the present application;

[0044] Explanation of reference signs:

[0045] 1, mechanical arm; 11, extension arm; 2, aluminum plate; 3, welding cover; 31, side beam; 32, cross beam; 33, vertical beam; 4, limiting column; 41, elastic sheet; 42, guide rod; 5, swing rod; 51, cambered section; 52, connecting shaft; 53, main supporting block; 54, main flap; 55, convex plate; 6, rotating shaft; 61, gear; 62, auxiliary supporting block; 63, auxiliary flap; 7, suspension; 71, boom; 72, transfer bar; 8, welding frame; 81, frame; 811, arc frame; 82, arc-shaped piece; 83, curved plate; 84, welding rod; 85, welding gun; 9, roller frame. DETAILED DESCRIPTION

[0046] In order to make the technical personnel in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0047] Example one

[0048] Please refer to Figures 1-14 , the present application provides a technical solution: through the welding cover 3 driven by the mechanical arm 1 along the weld direction, the welding gun 85 completes the automatic welding work, without manual participation in the welding work, reduces the welding labor intensity, and also improves the automation efficiency. In the welding process, the equidistantly distributed limiting column 4 can adapt to the arc shape of the outer wall of the aluminum plate 2, and the guide rod 42 is used to provide driving power to the arc-shaped piece 82, so that the arc-shaped piece 82 moves circumferentially upward or downward, so that the welding rod 84 moves in a fan-shaped path, and the center of the fan-shaped circle is located in the welding pool, and at the same time, the welding gun 85 adjusts the included angle between the welding seam, realizes that the limiting column 4 is adapted to the arc surface and generates power in the process of sliding contact, and finally acts on the welding gun 85 to adjust the welding angle, so that the tungsten electrode and the changed welding seam maintain a constant angle, thereby greatly reducing the problems of arc blow, abnormal argon coverage and the like.

[0049] Specifically, the workpiece is formed by assembling a plurality of aluminum plates 2, and includes an arc-shaped concave surface and an arc-shaped convex surface. The welding cover 3 is installed on the flange plate at the output end of the extension arm 11 by bolts and nuts. When the welding cover 3 is driven by the mechanical arm 1 to move, the port of the welding cover 3 and the outer wall of the aluminum plate 2 maintain a predetermined distance (the distance is not enough for the argon gas discharged from the welding gun 85 to enter the air, so that part of the argon gas enters the welding cover 3 and then is discharged downward from the gap), and the limiting column 4 and the welding gun 85 extend out of the port for sliding contact and welding work. Figure 4 As shown, the gap is at the bottom of the welding cover 3, which facilitates the inspection of parts by the staff from the bottom of the welding cover 3.

[0050] Further, the elastic sheet 41 is made of elastic metal and presents an arc-shaped protrusion, and the arc-shaped two ends are welded with the end of the limiting column 4, so that the arc top can be deformed to increase the contact surface when being in sliding contact with the outer wall of the aluminum plate 2, so that the parts in the welding cover 3 can be driven to contact the outer wall of the aluminum plate 2 and have the buffering function, and the heat conduction performance is improved, so that the heat is more easily transferred to the copper limiting column 4. In combination with the opening in the side wall of the welding cover 3, the argon gas flows through the plurality of limiting columns 4 and is discharged from the opening, so that the heat absorbed by the limiting column 4 can be carried away by the airflow in the process. The heat redundancy caused by the need to slow down when welding through the position with large curvature can be absorbed and dissipated to reduce the range of heat affected zone, and the cooling rate of the welding pool after welding can be improved, and the oxidation of the welding pool caused by high temperature and contact with air can be reduced.

[0051] Further, the inner walls of the two sides of the welding cover 3 respectively have equidistantly distributed limiting columns 4, and the limiting columns 4 on the two sides are in the same plane (the plane is parallel to the upper and lower end faces of the welding cover 3), so that the limiting columns 4 symmetrically arranged on the two sides of the welding seam can also press the aluminum plate 2 to ensure that the adjacent aluminum plates 2 are on the same working surface and avoid the error of the welding seam being skewed. The end of the plurality of limiting columns 4 on one side is in contact with the arc surface of the outer wall of the aluminum plate 2 and is relatively parallelly moved, so that the end of the guide rod 42 welded (or threadedly connected, or fixedly connected in a manner known to those skilled in the art) to the other end of the limiting column 4 has a height difference, and the driving force generated by the height difference acts on the arc-shaped member 82 through the rotating shaft 6, so that the welding rod 84 can present a fan-shaped motion track with the welding pool as the center, the position of the hot melting does not change during the angle adjustment, the interference factor of the welding pool is reduced, and the stability of the welding pool is ensured.

[0052] In another embodiment of the present application, the side beam 31 can keep the welding rod 84 stable during movement, so that the welding gun 85 does not easily have angle error when being deflected with the welding pool as the center. The roller frame 9 is parallel to the welding rod 84, so that the welding gun 85 on the two sides is supported and limited by the roller frame 9, the stable movement of the welding gun 85 is ensured, and the roller frame 9 with adjustable extension length can adapt to the welding height required by the welding gun 85, so that the welding gun 85 can be used for welding aluminum sheet metal pieces with different thicknesses.

[0053] Specifically, as shown in Figure 5 The inner wall of the welding cover 3 is integrally formed with symmetrically distributed side beams 31, and the upper and lower ends of the side beams 31 are welded with horizontal plates. The upper and lower ends of the arc-shaped member 82 are welded with springs in contact with the horizontal plates, and the two springs are not deformed in the default state, so that the deformed springs can adapt to the up-down movement of the arc-shaped member 82.

[0054] Further, the end of the welding rod 84 is welded with the frame 81, the frame 81 is provided with a horizontal rod at the end, and the horizontal rod is the welding frame 8, and the arc-shaped part 82 is integrally formed on the welding frame 8. The arc-shaped part 82 is integrally formed with the arc-shaped frame 811 provided with an arc-shaped hole at both sides of the frame 81, and the rotating shaft 6 is slid in the arc-shaped hole, and the rotating shaft 6 rotates on the side beam 31. The purpose is that the arc-shaped frame 811 in the circumferential direction can be actively located outside the rotating shaft 6 to avoid the interference of the stroke. Similarly, the rod of the roller frame 9 itself is provided with a bending section, which is also used to prevent interference with the rotating shaft 6, and the rod is provided with a roller at one end and is inserted and screwed with a block, a rectangular block and a nut at the other end. The welding frame 8 is provided with a square hole for inserting the rectangular block, so that the bending section is always in a vertical state. One or more metal washers can be used between the block and the welding frame 8, which is used to extend the length of the roller extending out of the port of the welding cover 3, so that after the roller contacts the aluminum plate 2, the height of the tungsten electrode from the weld is adjusted to adapt to the welding work of workpieces of different thicknesses.

[0055] Further, the side beam 31 is also provided with an arc-shaped hole for the arc-shaped movement of the welding frame 8, and the welding frame 8 has a protrusion, and the protrusion is slid in the groove additionally provided in the inner wall of the arc-shaped hole, so that the welding frame 8 is limited on both sides, and the arc-shaped part 82 can only move in an arc shape to meet the requirement of angle adjustment.

[0056] Further, the welding cover 3 is also welded with the vertical beam 33, and the vertical beam 33 is provided with holes for the sliding insertion of the plurality of guide rods 42, so that the limiting column 4 is more stable during movement. The limiting column 4 is welded with springs outside the guide rods 42 at the end and the vertical beam 33, and the plurality of springs are of the same specification, so that the ends of all the guide rods 42 are flush in the default state, which is convenient for completing the deflection and pushing of the swing rod 5.

[0057] In another embodiment of the present application, Figure 13 As shown in the cross section, the transfer bar 72 is arranged in the acute triangle region between the main turning plate 54 and the auxiliary turning plate 63, so that when the swing rod 5 is rotated by the guide rod 42, the main turning plate 54 will rotate, at this time, the transfer bar 72 will penetrate into the top angle of the triangle (i.e. the two transfer bars 72 are close to each other) due to the spring recovery deformation, so that the auxiliary turning plate 63 will be pressed by the transfer bar 72 and rotate in the opposite direction, thereby causing the rotation of the swing rod 5 and the rotation of the gear 61 to be in opposite states, so that Figure 4 and Figure 9For the front view, it corresponds exactly when the limiting column 4 moves on the concave surface, the swing bar 5 rotates clockwise, the gear 61 rotates counterclockwise, the required arc-shaped part 82 moves upward in an arc shape, and the angle of the welding gun 85 is reduced (the acute angle between the welding gun 85 and the weld, the angle will increase when moving to the concave surface, and will decrease when moving to the convex surface). When the limiting column 4 moves on the convex surface, the swing bar 5 rotates counterclockwise, the gear 61 rotates clockwise, the required arc-shaped part 82 moves downward in an arc shape, and the angle of the welding gun 85 is increased, thereby achieving the function of self-adaptive angle adjustment. Compared with electronic control adjustment, direct physical adjustment has higher stability and long-term effectiveness.

[0058] Specifically, the swing bar 5 is welded with a connecting shaft 52, a hole is formed in the side wall of the welding cover 3 for the movement of the connecting shaft 52, and a tension spring is further welded on the outside of the connecting shaft 52, and the end of the tension spring is rotationally connected with the inner wall of the welding cover 3. Therefore, the connecting shaft 52 can rotate and move along its axis, meeting the working versatility and use ability of the swing bar 5.

[0059] Further, an arc segment 51 is formed on the end surface of the swing bar 5 in contact with the guide rod 42. The purpose is that only when all guide rods 42 simultaneously apply force to the arc segment 51, the swing bar 5 will move along the axis of the connecting shaft 52 (under the working condition of the drop, at least one guide rod 42 cannot apply pressure to the swing bar 5). Therefore, the extension arm 11 can drive the end of the plurality of limiting columns 4 to simultaneously apply pressure to the aluminum plate 2, and the reaction force of the elastic sheet 41 can simultaneously generate a driving force for sliding and extruding the arc segment 51 of all guide rods 42, so that the translation condition of the swing bar 5 is not easily disturbed by external factors, and the driving source of power switching is more safe and reliable.

[0060] Further, as shown in Figure 8 , Figure 11 , Figure 13 and Figure 14 , a gear 61 is fixedly sleeved in the middle of the rotating shaft 6, and a plurality of teeth are integrally formed on the inner ring of the arc-shaped part 82, which always mesh with the gear 61, so that the meshing transmission remains stable, and the tooth density corresponds to a tooth rotation of 0.5°. The end of the rotating shaft 6 (provided with a threaded hole) is fixedly installed with a secondary support block 62 (welded with a bolt) by a bolt, and the secondary support block 62 is integrally formed with symmetrically distributed secondary flaps 63. A main support block 53 is welded on the side wall of the swing bar 5, and the main support block 53 is integrally formed with symmetrically distributed main flaps 54, and the end surface of the main flaps 54 is further integrally formed with a convex plate 55. Meanwhile, the vertical bevel of the convex plate 55 and the main flaps 54 is treated with a round corner, so that the round corner and the middle transfer bar 72 slide, and the round corner sliding has smooth and stable power supply.

[0061] Further, the side wall of the side beam 31 is integrally formed with upper and lower symmetrically distributed cross beams 32, the middle transfer bar 72 is welded and fixed at both ends by a hanger 71, the hanger 71 is welded on the suspension 7, a vertical rod is welded on the suspension 7, a through hole is formed on the cross beam 32 for the vertical rod to slide vertically, and a default state elastic member is welded on the end face of the suspension 7, the elastic member is a spring, the spring is outside the vertical rod, and the end portion slides on the end face of the cross beam 32, so that the upper and lower suspensions 7 can provide stable guidance and support for the middle transfer bar 72, and avoid errors and jamming problems in the movement.

[0062] In another embodiment provided by the application, the swing lever 5 is driven to move along the axis of the connecting shaft 52 to the inside of the welding cover 3, at this time, the round corner position on the convex plate 55 pushes the middle transfer bar 72 to translate, so that the position with increased thickness of the middle transfer bar 72 is actively close to the auxiliary flap 63, and the auxiliary flap 63 is rotated by a predetermined angle in advance (the main flap 54 is not deflected by the translation of the middle transfer bar 72, because the swing lever 5 needs to be driven by all the guide rods 42 to keep stable, and the deflection power is less than the pressure required by the spring deformation on the guide rod 42), so that the rotation of the rotating shaft 6 finally acts on the arc-shaped member 82, so that the welding gun 85 can adjust the welding angle in advance, thereby meeting the welding requirements of different workpieces, and the activity range remains unchanged, for example, the welding angle range is 15°-21° by default, and is adjusted to 10°-16° or 20°-26°, so that the welding adaptation ability is stronger.

[0063] Specifically, as shown in Figure 14 , the middle transfer bar 72 is gradually changed, and the thin end faces the inside of the welding cover 3, and the thick end is pushed by the convex plate 55, that is, corresponding to the inclined surface provided on the middle transfer bar 72.

[0064] Further, the curved plate 83 is welded on the end of the welding frame 8, and the curved plate 83 is made of elastic metal material, and the end of the curved plate 83 is more likely to deform, so that when the middle transfer bar 72 translates, the thin end of the middle transfer bar 72 abuts against the curved plate 83 to slide, and the gradual inclined surface can be used to press the curved plate 83 to increase the stability during movement.

[0065] In another embodiment provided by the application, as shown in Figure 13 and Figure 14 , through the overlapping process of the main flap 54 and the auxiliary flap 63 (both return to the same surface, and the triangular area begins to disappear), at this time, the main flap 54 abuts against the sliding middle transfer bar 72 away from the main supporting block 53, until the spring on the suspension 7 is in the default deformation and energy storage state, and the middle transfer bar 72 abuts against the end of the main flap 54 and the auxiliary flap 63 (the three are on the same surface), and when the main flap 54 is driven to adjust the angle in reverse, the auxiliary flap 63 also reversely opens the triangular area again (the three are on the same surface). Figure 14The dashed line in the middle represents the adjustment position of the main flap 54 and the auxiliary flap 63), the transfer bar 72 enters the triangular area again, and the welding gun 85 is adjusted in the reverse angle to meet the positive and negative value adjustment of the angle.

[0066] Specifically, the end of the main flap 54 and the auxiliary flap 63 is provided with a symmetrical round corner, so that the end of the transfer bar 72 can smoothly slide into the triangular area from the round corner on any side, so that the angle adjustment up or down is smooth due to the existence of the round corner, and the mechanical transmission reaction of the parts is also faster.

[0067] Embodiment two

[0068] An aluminum sheet metal part hot welding method, comprising the aluminum sheet metal part hot welding system, further comprising the following steps:

[0069] S1, use a stainless steel wire brush to physically polish along the plate part welding area, and then use a acetone and isopropyl alcohol soaked lint to wipe the polished position;

[0070] S2, after chemical degreasing of the plate part, use a hot air gun to dry the welding area;

[0071] S3, check the equipment and parts in the mechanical arm 1, the extension arm 11 and the welding cover 3;

[0072] S4, fix the workpiece and fix and protect it with the corresponding fixing tool;

[0073] S5, use a hot air gun to preheat the welding area;

[0074] S6, move the welding cover 3 to the welding seam through the mechanical arm 1 and the extension arm 11, and make the tungsten electrode on the welding gun 85 above the molten pool, first open the argon valve, then cover the argon gas at the welding seam position, and then perform power-on and welding work;

[0075] S7, use a steel wire brush and an aluminum welding seam special cleaner to clean the welding seam after welding;

[0076] S8, remove the fixing tool used to protect the workpiece.

[0077] The above only describes some exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above figures and description are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A system for hot welding of aluminium sheet metal parts, comprising a robot arm (1) provided with an elongated arm (11), characterised in that, The end of the extension arm (11) is fixedly installed with a welding cover (3) with a gap, further comprising: A welding rod (84) is fixedly installed with a welding gun (85) outside the gap at one end, and an arc-shaped piece (82) at the other end, and the arc-shaped piece (82) is coupled and driven by a rotating shaft (6); The limiting column (4) is arranged equidistantly on both sides of the welding seam, and the end of the single-sided limiting column (4) is in close contact with the side wall of the aluminum plate (2), wherein: When the limiting column (4) is driven and pushes the rotating shaft (6) to rotate, the arc-shaped piece (82) moves along a predetermined arc-shaped path.

2. The aluminum sheet metal part heat welding system of claim 1, wherein, Further comprising a welding frame (8) for installing the welding rod (84), and the welding frame (8) is fixedly installed with a roller frame (9) symmetrically distributed on both sides of the moving path of the welding gun (85).

3. The aluminum sheet metal part heat welding system of claim 1, wherein, The end of the limiting column (4) is fixedly installed with an elastic sheet (41) for resisting the sliding of the workpiece.

4. The aluminum sheet metal part heat welding system of claim 2, wherein, Further comprising a swing lever (5) in transmission connection with the rotating shaft (6), and the swing lever (5) is in sliding assembly with multiple limiting columns (4).

5. The system for hot welding of aluminum sheet metal parts according to claim 4, characterized in that Further comprising a transfer bar (72) arranged between the rotating shaft (6) and the swing lever (5), and the transfer bar (72) is provided with an inclined surface for pushing the rotating shaft (6) and adjusting the rotation angle of the rotating shaft (6).

6. The system for heat welding aluminum sheet metal parts according to claim 5, wherein An elastic member is arranged on the transfer bar (72), which is in a default state of storing energy, and in this state, the transfer bar (72) is in contact with the rotating shaft (6).

7. The system for hot welding of aluminum sheet metal parts according to claim 5, wherein The end of the welding frame (8) is fixedly installed with a curved plate (83), and the inclined surface on the transfer bar (72) is in sliding connection with the surface of the curved plate (83).

8. The system for heat welding aluminum sheet metal parts according to claim 2, wherein The welding frame (8) is fixedly installed with an arc-shaped frame (811) sliding outside the rotating shaft (6).

9. The system for heat welding aluminum sheet metal parts according to claim 1, wherein A plurality of openings are formed in the side wall of the welding cover (3), which are communicated with the gaps between adjacent limiting columns (4).

10. A method of hot welding of aluminum sheet metal parts, characterized in that The aluminum sheet metal hot welding system of any one of claims 1-9 further comprises the following steps: S1, use a stainless steel wire brush to physically polish along the plate welding area, then use acetone and isopropyl alcohol soaked non-woven cloth to wipe the polished position; S2, after chemical degreasing of the plate, use a hot air gun to dry the welding area; S3, check the equipment and parts in the mechanical arm (1), extension arm (11) and welding cover (3); S4, fix the workpiece and match the corresponding fixed tooling for protection; S5, use a hot air gun to preheat the welding area; S6, move the welding cover (3) to the welding seam through the mechanical arm (1) and the extension arm (11), and make the tungsten electrode on the welding gun (85) above the molten pool, first open the argon valve, then cover the argon gas at the welding position, and then perform power supply and welding work; S7, use a steel wire brush and an aluminum welding seam special cleaner to clean the welding seam after welding; S8, remove the fixed tooling for protecting the workpiece.

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