Intelligent welding device for body-in-white metal plate

Abstract

The invention discloses a body-in-white metal plate intelligent welding device, and particularly relates to the technical field of body-in-white welding, the body-in-white metal plate intelligent welding device comprises a manipulator, a connecting arm is fixed on the manipulator, a support is fixed on the outer wall of the connecting arm, and spot welding electrodes are mounted at the top and the bottom of the support through driving arms; two sets of grinding assemblies are arranged between the ends, close to each other, of the two spot welding electrodes, the two spot welding electrodes and the two sets of grinding assemblies are in one-to-one correspondence, each grinding assembly comprises an outer cylinder and an inner cylinder rotationally arranged in the outer cylinder, and an outer wall grinding mechanism and a bottom end grinding mechanism which are distributed up and down are arranged in the inner cylinder. According to the spot-welding electrode polishing device, dirt on the spot-welding electrode can be automatically monitored, when the spot-welding electrode needs to be polished, the spot-welding electrode is automatically polished online while the spot-welding electrode moves, shutdown operation is not needed, the welding efficiency is guaranteed, the welding quality is improved, excessive polishing of the electrode can be avoided, and the service life of the electrode is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of white body welding, and particularly relates to an intelligent welding device for white body sheet metal. Background Art

[0002] Common welding methods on vehicle bodies include spot welding, projection welding, shielded metal arc welding, laser welding, etc.; spot welding is the most common and most used welding method. It is statistically shown that there are thousands of spot welds on a vehicle. Spot welding uses columnar electrodes to form weld spots between the contact surfaces of two overlapping workpieces. Spot welding of white body sheet metal is the core process for connecting thin sheet metals in automobile manufacturing. A fusion core is formed at the overlap through resistance heat to achieve efficient and reliable structural connection.

[0003] During welding, the electrodes directly contact the workpieces, and dirt (such as oxides and alloy adhesion layers) will be generated on the electrodes due to metal spatter and oxidation. The contamination will increase the contact resistance, resulting in uneven heat distribution, and even defects such as false welding and burn-through of the weld spots. The existing solution is usually to remove the electrodes and clean the electrode surfaces manually or using, for example, a welding electrode automatic cleaning mechanism with the publication number CN222059238U. Since the electrodes need to be removed for machining, it is not only time-consuming and laborious, but also the equipment needs to be shut down, greatly affecting the work efficiency.

[0004] Currently, in the prior art, structures such as those with the publication numbers CN112296501A and CN112296502A can be used to achieve on-line grinding and cleaning of the electrodes. However, they grind the electrodes before each operation, which is prone to the problem of excessive grinding of the electrodes. Excessive grinding will cause problems such as too small diameter and decreased conductivity of the electrodes, shortening the service life of the electrodes.

[0005] Based on the above problems, the present invention proposes an intelligent welding device for white body sheet metal. Summary of the Invention

[0006] The object of the present invention is to provide an intelligent welding device for white body sheet metal, which can automatically monitor the dirt on the spot welding electrodes and, when the spot welding electrodes need to be ground, automatically grind the spot welding electrodes on-line while the spot welding electrodes are moving, without the need for shutdown operation, ensuring the welding efficiency, improving the welding quality, and also avoiding excessive grinding of the electrodes and prolonging the service life of the electrodes.

[0007] To achieve the above object, the present invention provides the following technical solution: An intelligent welding device for white body sheet metal, including a manipulator, a connecting arm is fixed on the manipulator, a bracket is fixed on the outer wall of the connecting arm, spot welding electrodes are installed at the top and bottom of the bracket through driving arms. During spot welding, the spot welding electrodes first apply pressure to make the workpieces closely contact, and then the current is switched on. Under the action of resistance heat, the contact parts of the workpieces melt and form weld spots after cooling.

[0008] There are two sets of grinding components between the adjacent ends of two spot welding electrodes. The two spot welding electrodes correspond to the two sets of grinding components one by one, and are used for monitoring and grinding the spot welding electrodes.

[0009] The grinding component includes an outer cylinder and an inner cylinder rotatably arranged in the outer cylinder. An outer wall grinding mechanism and a bottom end grinding mechanism are arranged up and down in the inner cylinder.

[0010] Preferably, a driving structure for driving the inner cylinder to rotate is arranged in the outer cylinder; a first circular cavity, a second circular cavity and a third circular cavity are successively arranged inside the inner cylinder. The inner diameter of the second circular cavity is the same as the outer wall diameter of the spot welding electrode. The inner diameters of the first circular cavity and the third circular cavity are larger than the outer wall diameter of the spot welding electrode. When the spot welding electrode without dirt moves vertically, it can smoothly pass through the second circular cavity. If there is dirt on the outer wall of the spot welding electrode, the spot welding electrode cannot smoothly pass through the second circular cavity when moving vertically.

[0011] Preferably, the outer wall grinding mechanism includes a movable ring and a grinding ring arranged in the first circular cavity. The grinding ring is a grinding ring made in a ring shape. The grinding ring is fixed outside the movable ring and extends into the movable ring, and the inner diameter of the grinding ring is the same as the inner diameter of the second circular cavity; two sliders are fixed on the outer wall of the movable ring. Chute grooves are arranged on both sides of the first circular cavity. The sliders are arranged in the chute grooves and are slidably connected with the chute grooves. The movable ring is connected with the inner wall of the first circular cavity through at least one first spring; a first touch switch is fixed on the inner wall of the first circular cavity.

[0012] Preferably, when there is no dirt on the spot welding electrode, the spot welding electrode can pass through the grinding ring and the first circular cavity; when dirt accumulates on the outer wall of the spot welding electrode, the spot welding electrode cannot pass through the grinding ring and is blocked by the grinding ring. Subsequently, the spot welding electrode moves to drive the movable ring and the grinding ring to move until the first touch switch is squeezed. Subsequently, the driving structure is started to drive the inner cylinder to rotate, so as to drive the grinding ring to rotate to grind the outer wall of the spot welding electrode.

[0013] Preferably, the bottom end grinding mechanism includes two grinding half cylinders arranged in the second circular cavity. The grinding half cylinder is a grinding cylinder made in a semi-cylindrical shape. A bottom plate is arranged at one end of each grinding half cylinder far away from the outer wall grinding mechanism. A second touch switch is fixed at one end of the bottom plate close to the grinding half cylinder. After the outer wall of the spot welding electrode is ground by the outer wall grinding mechanism, the bottom end of the spot welding electrode enters the two grinding half cylinders until the grinding half cylinders are driven to move to squeeze the second touch switch. Subsequently, the driving structure is started to drive the grinding half cylinders to rotate to grind the bottom end of the spot welding electrode.

[0014] Receiving grooves are arranged on both sides of the second circular cavity. The two receiving grooves are respectively arranged on the sides of the two grinding half cylinders away from each other. Connecting blocks are fixed on the sides of the two bottom plates away from each other. Connecting block receiving grooves adapted to the connecting blocks are arranged on the sides of the two receiving grooves away from each other.

[0015] Installation grooves are provided in the middle of the sides where the two storage grooves are far away from each other. Telescopic devices are fixed in both installation grooves. The piston rod of the telescopic device is connected to the outer side of the grinding semi-cylinder, so as to store the grinding semi-cylinder in the storage groove after the bottom end of the spot welding electrode is ground.

[0016] Preferably, accommodation cavities are formed at one ends of the two grinding semi-cylinders close to the bottom plate. Fixed guide rods are fixed at one ends of the two bottom plates close to the grinding semi-cylinders. The fixed guide rods extend into the interior of the accommodation cavities, and the ends of the fixed guide rods far away from the bottom plate are connected to the inner walls of the accommodation cavities through the second springs; T-shaped sliding grooves are formed on the sides where the two grinding semi-cylinders are far away from each other. T-shaped sliders are fixed at the piston rod ends of the two telescopic devices. The T-shaped sliders are slidably arranged in the T-shaped sliding grooves, which is convenient for the grinding semi-cylinder to move up and down relative to the telescopic device, and can enable the telescopic device to drive the grinding semi-cylinder to move left and right.

[0017] Preferably, dust suction mechanisms for absorbing debris generated during grinding are provided at the top and bottom ends of the inner cylinder. The dust suction mechanisms include annular grooves formed inside the top and bottom ends of the inner cylinder. The two annular grooves are respectively arranged outside the first circular cavity and the third circular cavity. The first circular cavity and the third circular cavity are both communicated with the annular grooves through a plurality of dust suction holes. Dust suction pipes are fixed at the top and bottom ends of the outer wall of the inner cylinder. The two dust suction pipes are respectively communicated with the two annular grooves, and the two dust suction pipes are respectively arranged at the top and bottom of the outer cylinder.

[0018] Preferably, the driving arm includes a rotating arm. One end of the rotating arm is arranged inside the bracket and is rotatably connected to the bracket. A lifting driving device is fixed at the other end of the rotating arm. A support plate is fixed at one end of the spot welding electrode close to the rotating arm. The piston rod end of the lifting driving device is fixed to the support plate for driving the spot welding electrode to move up and down; two guide rods are arranged through the other end of the rotating arm. The two guide rods are respectively arranged on both sides of the lifting driving device and are slidably connected to the rotating arm. The two guide rods are fixed to the support plate for guiding the up and down movement of the spot welding electrode.

[0019] Preferably, the two ends of one ends of the two rotating arms are drivingly connected, so that the two rotating arms rotate in opposite directions, so as to drive the two spot welding electrodes to open and enable the white body sheet metal to enter between the two spot welding electrodes; during welding, the two spot welding electrodes rotate close to each other, and then the lifting driving device drives the spot welding electrodes to enter the grinding assembly and pass through the grinding assembly, and then the two spot welding electrodes contact the white body sheet metal for welding.

[0020] Preferably, connecting rods are fixed to the outer walls of the outer cylinders of the two grinding assemblies. A lead screw slide rail for driving the two connecting rods to move is fixed on one side of the bracket close to the connecting rods, and the two connecting rods move in opposite directions; when the two spot welding electrodes are unfolded, the lead screw slide rail drives the two grinding assemblies to move away from each other, and when the two spot welding electrodes are combined, the lead screw slide rail drives the two grinding assemblies to move close to each other.

[0021] In the above technical solution, the technical effects and advantages provided by the present invention are as follows:

[0022] 1. The present invention can automatically monitor the dirt on the spot welding electrode, and when the spot welding electrode needs to be ground, it can automatically and online grind the spot welding electrode while the spot welding electrode is moving, without the need for shutdown operation, ensuring the welding efficiency. At the same time, it reduces the occurrence of defects such as insufficient solder joint strength, increased spatter, false soldering, and solder joint burn-through caused by the surface contamination of the spot welding electrode, improves the welding quality, and can also avoid excessive grinding of the electrode and extend the service life of the electrode;

[0023] 2. The present invention is convenient for adjusting the distance between the spot welding electrodes to compensate for the problem of increased spacing caused by wear between the two spot welding electrodes, and avoids problems such as reduced welding current, insufficient solder joint penetration, false soldering, too shallow solder joint indentation, insufficient plastic deformation of the bonding surface, and reduced welding strength caused by the increased spacing between the two electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the overall structure diagram of the present invention;

[0025] Figure 2 is the expanded schematic diagram of the two spot welding electrodes of the present invention;

[0026] Figure 3 is the structure diagram of the present invention after removing the manipulator;

[0027] Figure 4 is the structure diagram of the driving arm and the spot welding electrode of the present invention;

[0028] Figure 5 is the cross-sectional view of the grinding assembly of the present invention;

[0029] Figure 6 is the cross-sectional view of the inner cylinder of the present invention;

[0030] Figure 7 is the front cross-sectional view of the inner cylinder of the present invention;

[0031] Figure 8 is Figure 7 the enlarged view of part A in

[0032] Figure 9 is Figure 7 the enlarged view of part B in

[0033] Figure 10 is the structure diagram of the movable ring and the grinding ring of the present invention;

[0034] Figure 11 is the cross-sectional view of the movable ring and the grinding ring of the present invention;

[0035] Figure 12Structural diagram of the grinding semi-cylinder of the present invention;

[0036] Figure 13 Cross-sectional view of the grinding semi-cylinder of the present invention;

[0037] Figure 14 Schematic diagram of the spot welding electrode grinding work of the present invention Figure One ;

[0038] Figure 15 Schematic diagram of the spot welding electrode grinding work of the present invention Figure Two 。

[0039] Description of reference numerals:

[0040] 1, manipulator; 2, connecting arm; 3, bracket; 4, driving arm; 5, spot welding electrode;

[0041] 41, rotating arm; 42, lifting driving device; 43, guide rod;

[0042] 51, support plate;

[0043] 6, grinding assembly; 61, outer cylinder; 62, inner cylinder; 63, first circular cavity; 64, second circular cavity; 65, third circular cavity; 66, outer wall grinding mechanism; 67, bottom grinding mechanism; 68, dust suction mechanism;

[0044] 661, movable ring; 662, grinding ring; 663, first spring; 664, first touch switch; 665, slider; 666, chute;

[0045] 671, grinding semi-cylinder; 672, telescopic device; 673, bottom plate; 674, second touch switch; 675, connecting block; 676, accommodating cavity; 677, fixed guide rod; 678, second spring; 679, T-shaped chute; 6710, T-shaped slider; 6711, storage groove; 6712, connecting block storage groove; 6713, installation groove;

[0046] 681, annular groove; 682, dust suction hole; 683, dust suction pipe;

[0047] 7, connecting rod; 8, screw rod slide rail. Detailed implementation manners

[0048] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further introduced in detail below in conjunction with the accompanying drawings.

[0049] The present invention provides as Figures 1 - 15An intelligent welding device for a body-in-white sheet metal is shown, including a manipulator 1. A connecting arm 2 is fixed on the manipulator 1. A bracket 3 is fixed on the outer wall of the connecting arm 2. Spot welding electrodes 5 are installed at the top and bottom of the bracket 3 through driving arms 4. After the spot welding electrodes 5 are connected to an electric current, the contact part of the workpiece can be melted under the action of resistance heat and form a solder joint after cooling.

[0050] There are two sets of grinding components 6 between the ends of the two spot welding electrodes 5 that are close to each other. The two spot welding electrodes 5 correspond to the two sets of grinding components 6 one by one, and are used to monitor and grind the spot welding electrodes 5.

[0051] Specifically, as Figures 3 - 4 shown, the driving arm 4 includes a rotating arm 41. One end of the rotating arm 41 is arranged inside the bracket 3 and is rotatably connected to the bracket 3. The other end of the rotating arm 41 is fixed with a lifting driving device 42. The lifting driving device 42 can be an electric cylinder or an electric push rod. One end of the spot welding electrode 5 close to the rotating arm 41 is fixed with a support plate 51, and the support plate 51 is arranged at the bottom of the other end of the rotating arm 41. The piston rod end of the lifting driving device 42 is fixed to the top end of the support plate 51 and is used to drive the spot welding electrode 5 to move up and down.

[0052] Two guide rods 43 are arranged through the other end of the rotating arm 41. The two guide rods 43 are respectively arranged on both sides of the lifting driving device 42 and are slidably connected to the rotating arm 41. The bottom ends of the two guide rods 43 are fixed to the top end of the support plate 51 and are used to guide the up and down movement of the spot welding electrode 5.

[0053] One ends of the two rotating arms 41 are drivingly connected. The driving structure includes but is not limited to the following structures exemplified in the present invention: One ends of the two rotating arms 41 are both connected to the bracket 3 through rotating shafts, and gears are fixed on both rotating shafts. The gears on the two rotating arms 41 are meshed with each other. A motor for driving one end of one of the rotating arms 41 to rotate is fixed on the outer wall of the bracket 3, and this motor is connected to the control system of the manipulator 1 (the manipulator 1 is controlled to work through an existing intelligent control system, which will not be further described here). When this motor drives one end of one of the rotating arms 41 to rotate, it drives the other rotating arm 41 to rotate in the opposite direction through the gear driving structure, so as to be able to drive the two spot welding electrodes 5 to open or close.

[0054] When the spot welding electrodes 5 are opened, the parts of the body-in-white that need to be welded can enter between the two spot welding electrodes 5. Then, the two spot welding electrodes 5 rotate closer. At this time, the welding ends of the two spot welding electrodes 5 are vertically arranged and are respectively outside the two grinding components 6. Then, the lifting driving device 42 drives the spot welding electrodes 5 to move vertically towards each other, enabling the spot welding electrodes 5 to enter the grinding components 6 and pass through the grinding components 6. Then, the two spot welding electrodes 5 contact the parts of the body-in-white that need to be welded, and spot welding work is carried out after being energized.

[0055] The two grinding assemblies 6 are mirror - distributed. The following only describes the structure of the upper grinding assembly 6 of the present invention. As Figures 5 - 13 shown, the grinding assembly 6 includes an outer cylinder 61 and an inner cylinder 62 rotatably arranged inside the outer cylinder 61. The outer cylinder 61 and the inner cylinder 62 are rotatably connected by bearings. A driving structure for driving the inner cylinder 62 to rotate is provided inside the outer cylinder 61. An outer - wall grinding mechanism 66 and a bottom - end grinding mechanism 67 are arranged up and down inside the inner cylinder 62.

[0056] The driving structure inside the outer cylinder 61 includes, but is not limited to, the following structure exemplified in the present invention: A gear ring is fixed on the outer wall of the inner cylinder 62. A cavity is formed on the inner wall of the outer cylinder 61, and a motor is fixed inside the cavity. The motor is connected to the control system of the manipulator 1. A gear meshing with the gear ring is fixed at the output end of the motor. By driving the gear to rotate by the motor, the gear ring can be driven to rotate, so as to drive the inner cylinder 62 to rotate, and further drive the outer - wall grinding mechanism 66 and the bottom - end grinding mechanism 67 to rotate for grinding the outer wall and the bottom of the spot - welding electrode 5.

[0057] Next, a first circular cavity 63, a second circular cavity 64, and a third circular cavity 65 are successively formed from top to bottom inside the inner cylinder 62. The inner diameter of the second circular cavity 64 is the same as the outer - wall diameter of the spot - welding electrode 5. The inner diameters of the first circular cavity 63 and the third circular cavity 65 are larger than the outer - wall diameter of the spot - welding electrode 5. When the spot - welding electrode 5 without dirt moves vertically, it can smoothly pass through the second circular cavity 64. If there is dirt on the outer wall of the spot - welding electrode 5, then when the spot - welding electrode 5 moves vertically, it cannot smoothly pass through the second circular cavity 64.

[0058] The outer - wall grinding mechanism 66 includes a movable ring 661 and a grinding ring 662 arranged in the first circular cavity 63. The grinding ring 662 is fixed at the top of the movable ring 661 and extends into the movable ring 661. The inner diameter of the grinding ring 662 is the same as the inner diameter of the second circular cavity 64, so that when the spot - welding electrode 5 without dirt moves vertically, it can smoothly pass through the grinding ring 662. If there is dirt on the outer wall of the spot - welding electrode 5, then when the spot - welding electrode 5 moves vertically, it cannot smoothly pass through the grinding ring 662.

[0059] Two sliders 665 are fixed on the outer wall of the movable ring 661. Chute grooves 666 are arranged on both sides of the first circular cavity 63. The sliders 665 are arranged in the chute grooves 666 and are slidably connected to the chute grooves 666. The bottom end of the movable ring 661 is connected to the bottom end inside the first circular cavity 63 by at least one first spring 663. A first touch switch 664 is fixed at the bottom end inside the first circular cavity 63. The first touch switch 664 is arranged at the bottom of the movable ring 661 and is connected to the control system of the manipulator 1.

[0060] When there is no dirt on the spot welding electrode 5, the spot welding electrode 5 can move downward through the grinding ring 662 and the first circular cavity 63 during welding. When dirt accumulates on the outer wall of the spot welding electrode 5, the spot welding electrode 5 cannot move downward through the grinding ring 662 and is blocked by the grinding ring 662 during welding. Subsequently, due to the increase in diameter, the spot welding electrode 5 contacts and presses down the grinding ring 662, thereby pressing down the movable ring 661 until it presses the first touch switch 664. Subsequently, the control system starts the drive structure to drive the inner cylinder 62 to rotate, thereby driving the grinding ring 662 to rotate and grind the outer wall of the spot welding electrode 5.

[0061] After the outer wall of the spot welding electrode 5 is ground, the spot welding electrode 5 enters the second circular cavity 64. The bottom grinding mechanism 67 in the second circular cavity 64 includes two grinding half cylinders 671. A bottom plate 673 is provided at the bottom of each grinding half cylinder 671, and a second touch switch 674 is fixed to the top of the bottom plate 673. The second touch switch 674 is connected to the control system of the manipulator 1.

[0062] Currently, conical electrode heads are mostly used in white body welding because the white body is mainly composed of thin sheet metals with a thickness of 0.8 - 2.0 mm (such as low-carbon steel and high-strength steel). The solder joints need to meet the requirements of high-precision positioning, small heat-affected zone, and high connection strength. The tip design of the conical electrode head can concentrate the current density and heat, effectively reducing the thermal deformation around the solder joint, and is particularly suitable for thin sheet spot welding. In addition, multi-layer board connections (such as three-layer boards) are often involved in white body welding. The concentrated heating characteristic of the conical electrode can avoid overheating or burn-through of the intermediate layer, and at the same time, stable nugget formation can be achieved by adjusting the electrode pressure and welding time. Therefore, for the conical electrode head, the bottom end of the spot welding electrode 5 of the present invention is a cone. When the two grinding half cylinders 671 contact, they form a grinding cylinder, and the inner cavity shape of the grinding cylinder fits the conical shape of the bottom end of the spot welding electrode 5.

[0063] Furthermore, during white body welding, cylindrical electrodes are also selected, such as in narrow positions like the installation points of door hinges. The larger contact area of the cylindrical electrode can disperse the pressure and avoid local overload; when the plate thickness difference is large (such as the lap joint of a thin plate and a thick plate), the cylindrical electrode can reduce the current density by increasing the contact area to prevent the thin plate from burning through. Therefore, the inner cavity shape of the grinding cylinder can also be designed to fit the cylindrical shape of the bottom end of the cylindrical electrode 5.

[0064] After the outer wall of the spot welding electrode 5 is ground by the outer wall grinding mechanism 66, the bottom end of the spot welding electrode 5 enters the two grinding half cylinders 671, and the rotating grinding half cylinders 671 grind the bottom end of the spot welding electrode 5.

[0065] Next, receiving grooves 6711 are provided on both sides of the circular cavity II 64. The two receiving grooves 6711 are respectively arranged on the sides of the two grinding half cylinders 671 away from each other. Connecting blocks 675 are fixed on the sides of the two bottom plates 673 away from each other. Connecting block receiving grooves 6712 adapted to the connecting blocks 675 are provided at the bottoms of the sides of the two receiving grooves 6711 away from each other.

[0066] Installation grooves 6713 are provided in the middle of the sides of the two receiving grooves 6711 away from each other. Telescopic devices 672 are fixed in the two installation grooves 6713. The telescopic devices 672 can be electric cylinders, electric push rods, etc. The piston rods of the telescopic devices 672 are connected to the outer sides of the grinding half cylinders 671. When the spot welding electrode 5 moves downward to drive the grinding half cylinders 671 to move downward and squeeze the touch switch II 674, the control system receives the signal of the touch switch II 674 and starts the telescopic device 672 to contract, driving the grinding half cylinders 671 to be received in the receiving grooves 6711. Then, the spot welding electrode 5 can continue to move through the grinding assembly 6, so that the spot welding electrode 5 contacts the part of the white body to be welded for spot welding work.

[0067] T-shaped sliding grooves 679 are formed on the sides of the two grinding half cylinders 671 away from each other. T-shaped sliding blocks 6710 are fixed at the piston rod ends of the two telescopic devices 672. The T-shaped sliding blocks 6710 are slidably arranged in the T-shaped sliding grooves 679, which is convenient for the grinding half cylinders 671 to move up and down relative to the telescopic devices 672, and can enable the telescopic devices 672 to drive the grinding half cylinders 671 to move left and right.

[0068] Accommodating cavities 676 are also formed at the bottoms of the two grinding half cylinders 671. Fixed guide rods 677 are fixed at the tops of the two bottom plates 673. The fixed guide rods 677 extend into the interiors of the accommodating cavities 676, and the tops of the fixed guide rods 677 are connected to the inner walls of the accommodating cavities 676 through springs II 678, which is convenient for the grinding half cylinders 671 to reset after moving downward, and when the grinding half cylinders 671 are received in the receiving grooves 6711, the bottom plates 673 are also driven to be received in the receiving grooves 6711, avoiding hindering the movement of the spot welding electrode 5.

[0069] Moreover, connecting rods 7 are fixed on the outer walls of the outer cylinders 61 of the two grinding assemblies 6. A lead screw slide rail 8 for driving the two connecting rods 7 to move is fixed on the side of the bracket 3 close to the connecting rods 7. The lead screw slide rail 8 is a common linear motion execution component in mechanical transmission, which is composed of a lead screw, a nut, a slide rail, a slider, etc. The lead screw is driven by a motor to rotate, and the nut moves along the axial direction of the lead screw, driving the load to move linearly on the slide rail through the slider. In the present invention, the thread helix directions at both ends of the lead screw of the lead screw slide rail 8 are opposite, so that the two connecting rods 7 move in opposite directions.

[0070] The above structure is used to cooperate with the spot welding electrodes 5 for expansion and merging actions. When the two spot welding electrodes 5 expand, the screw rod slide rail 8 drives the two grinding components 6 away from each other. At this time, the grinding components 6 will not obstruct the welding part of the white body from entering between the two spot welding electrodes 5. After the two spot welding electrodes 5 are controlled to merge during welding, the screw rod slide rail 8 then drives the two grinding components 6 closer to each other.

[0071] The working principle of the present invention is as follows:

[0072] The motor on the bracket 3 drives the two rotating arms 41 to rotate outwards to drive the two spot welding electrodes 5 to open. At the same time, the screw rod slide rail 8 drives the two grinding components 6 away from each other, as Figure 2 shown. Then the manipulator 1 drives the connecting arm 2 to move, so that the two spot welding electrodes 5 and the two grinding components 6 are outside the welding part of the white body. Then the motor on the bracket 3 drives the two spot welding electrodes 5 to merge again, and at the same time, the screw rod slide rail 8 drives the two grinding components 6 closer to each other. When the welding ends of the two spot welding electrodes 5 are vertical, at this time, the two spot welding electrodes 5 are respectively outside the two grinding components 6. Then the motor on the bracket 3 stops working, as Figure 1 and Figure 3 shown. Then the lifting drive device 42 drives the spot welding electrode 5 to vertically enter the inner cylinder 62. If there is no dirt on the spot welding electrode 5, the spot welding electrode 5 can smoothly pass through the first circular cavity 63, the second circular cavity 64, and the third circular cavity 65. Then the spot welding electrode 5 contacts the welding part of the white body that needs to be welded. The spot welding electrode 5 is energized, and under the action of resistance heat, spot welding is performed on the welding part of the white body that needs to be welded;

[0073] If there is no dirt on the spot welding electrode 5, the outer wall diameter of the spot welding electrode 5 increases. When the spot welding electrode 5 vertically enters the inner cylinder 62, it will contact the grinding ring 662 in the first circular cavity 63. The spot welding electrode 5 continues to move downward to press the grinding ring 662 and the movable ring 661. The movable ring 661 compresses the first spring 663 until the movable ring 661 squeezes the first touch switch 664. Then the drive structure in the outer cylinder 61 drives the inner cylinder 62 to rotate, so as to drive the grinding ring 662 to rotate and grind the outer wall of the spot welding electrode 5. After the dirt on the spot welding electrode 5 is ground, the spot welding electrode 5 will continue to move downward into the second circular cavity 64;

[0074] Then the bottom of the spot welding electrode 5 will enter the two grinding half cylinders 671, as Figure 14 shown. At this time, the rotating inner cylinder 62 will also drive the two grinding half cylinders 671 to rotate to perform rotational grinding on the bottom of the spot welding electrode 5. Due to the continuous downward movement of the spot welding electrode 5, it will drive the grinding half cylinders 671 to move downward, so that the grinding half cylinders 671 squeeze the second touch switch 674 on the bottom plate 673. Then the telescopic device 672 contracts to drive the grinding half cylinders 671 and the bottom plate 673 to be received in the receiving groove 6711;

[0075] The ground spot welding electrode 5 can continue to pass through the circular cavity three 65, as Figure 15 shown. After the grinding ring 662 is not extruded, the movable ring 661 and the grinding ring 662 reset and do not extrude the touch switch one 664, then the driving structure in the outer cylinder 61 stops working to make the inner cylinder 62 stop rotating. The ground spot welding electrode 5 passing through the grinding assembly 6 can continue to perform spot welding work on the white body.

[0076] The present invention can automatically monitor the dirt on the spot welding electrode 5 and automatically grind the spot welding electrode 5 online when it needs to be ground, without the need for shutdown operation, ensuring the welding efficiency. At the same time, it reduces the occurrence of defects such as insufficient solder joint strength, increased spatter, false soldering, and solder joint burn-through caused by the surface contamination of the spot welding electrode 5, improves the welding quality, and can also avoid excessive grinding of the electrode and extend the service life of the electrode;

[0077] In addition, after the spot welding electrode 5 is ground multiple times, it will inevitably wear and cause the distance between the two spot welding electrodes 5 to increase. An increase in the electrode distance is likely to cause a decrease in the welding current, insufficient penetration of the solder joint, and false soldering. Moreover, an increase in the electrode distance will also cause a decrease in the pressure exerted by the electrode on the white body, resulting in too shallow a solder joint indentation or insufficient plastic deformation of the bonding surface and a reduction in the welding strength. Currently, the prior art addresses the above problems by replacing the electrode, while the present invention can drive the two spot welding electrodes 5 to move towards each other through the lifting drive device 42 to compensate for the distance between the two spot welding electrodes 5 to avoid the above problems and improve the welding quality.

[0078] As Figures 5 - 7 shown, the present invention also provides a dust suction mechanism 68 at the top and bottom of the inner cylinder 62 for absorbing the debris generated during grinding. The dust suction mechanism 68 includes annular grooves 681 opened inside the top and bottom of the inner cylinder 62. The two annular grooves 681 are respectively arranged outside the circular cavity one 63 and the circular cavity three 65. The circular cavity one 63 and the circular cavity three 65 are both communicated with the annular grooves 681 through a plurality of dust suction holes 682. Dust suction pipes 683 are fixed to the top and bottom outer walls of the inner cylinder 62. The two dust suction pipes 683 are respectively communicated with the two annular grooves 681, and the two dust suction pipes 683 are respectively arranged at the top and bottom of the outer cylinder 61.

[0079] The dust suction pipe 683 is connected to a dust suction fan through a hose. The suction force generated by the dust suction fan can suck away the debris generated during grinding through the dust suction holes 682, the annular grooves 681, and the dust suction pipes 683. On the one hand, it can prevent the debris from adhering to the spot welding electrode 5 again, and on the other hand, it can also prevent the debris from splashing and affecting the surrounding environment.

[0080] It should be noted that wires need to be connected to the touch switch one 664, the telescopic device 672, and the touch switch two 674 in the inner cylinder 62. To avoid the wires from being wound when the inner cylinder 62 rotates and the hose on the dust suction pipe 683 from being wound, the motor in the driving structure inside the outer cylinder 61 is preferably a forward and reverse motor. A forward and reverse motor is a motor that can achieve forward and reverse rotation and is widely used in mechanical systems that require bidirectional rotational motion, such as automation equipment, robots, conveying devices, household appliances, etc. By driving the inner cylinder 62 to rotate back and forth with the forward and reverse motor, both the grinding purpose can be achieved and the problems of wire and hose winding can be avoided.

[0081] Only some exemplary embodiments of the present invention have been described above by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An intelligent welding device for a white body sheet metal, comprising a manipulator (1), characterized in that: A connecting arm (2) is fixed on the manipulator (1), a bracket (3) is fixed on the outer wall of the connecting arm (2), and spot welding electrodes (5) are installed at the top and bottom of the bracket (3) through driving arms (4); There are two groups of grinding components (6) between the ends of the two spot welding electrodes (5) close to each other. The two spot welding electrodes (5) and the two groups of grinding components (6) are in one-to-one correspondence, and are used for monitoring and grinding the spot welding electrodes (5); The grinding component (6) includes an outer cylinder (61) and an inner cylinder (62) rotatably arranged in the outer cylinder (61). An outer wall grinding mechanism (66) and a bottom end grinding mechanism (67) are arranged up and down in the inner cylinder (62).

2. The intelligent welding device for the body-in-white sheet metal according to claim 1, wherein: A driving structure for driving the inner cylinder (62) to rotate is arranged in the outer cylinder (61); A first circular cavity (63), a second circular cavity (64) and a third circular cavity (65) are sequentially formed inside the inner cylinder (62). The inner diameter of the second circular cavity (64) is the same as the outer wall diameter of the spot welding electrode (5), and the inner diameters of the first circular cavity (63) and the third circular cavity (65) are larger than the outer wall diameter of the spot welding electrode (5).

3. The intelligent welding device for the white body sheet metal according to claim 2, characterized in that: The outer wall grinding mechanism (66) includes a movable ring (661) and a grinding ring (662) arranged in the first circular cavity (63). The grinding ring (662) is fixed outside the movable ring (661) and extends inside the movable ring (661), and the inner diameter of the grinding ring (662) is the same as the inner diameter of the second circular cavity (64); Two sliders (665) are fixed on the outer wall of the movable ring (661). Chute grooves (666) are arranged on both sides of the first circular cavity (63). The sliders (665) are arranged in the chute grooves (666) and are slidably connected with the chute grooves (666). The movable ring (661) is connected with the inner wall of the first circular cavity (63) through at least one first spring (663); A first touch switch (664) is fixed on the inner wall of the first circular cavity (63).

4. An intelligent welding device for white body sheet metal according to claim 3, characterized in that: When there is no dirt on the spot welding electrode (5), the spot welding electrode (5) can pass through the grinding ring (662) and the first circular cavity (63); When dirt accumulates on the outer wall of the spot welding electrode (5), the spot welding electrode (5) cannot pass through the grinding ring (662) and is blocked by the grinding ring (662). Subsequently, the spot welding electrode (5) moves to drive the movable ring (661) and the grinding ring (662) to move until the first touch switch (664) is pressed. Subsequently, the driving structure is started to drive the inner cylinder (62) to rotate, so as to drive the grinding ring (662) to rotate to grind the outer wall of the spot welding electrode (5).

5. The intelligent welding device for white body sheet metal according to claim 4, wherein: The bottom end grinding mechanism (67) includes two grinding half cylinders (671) arranged in the second circular cavity (64). A bottom plate (673) is arranged at one end of each grinding half cylinder (671) far away from the outer wall grinding mechanism (66). A second touch switch (674) is fixed at one end of the bottom plate (673) close to the grinding half cylinder (671); After the outer wall of the spot welding electrode (5) is ground by the outer wall grinding mechanism (66), the bottom end of the spot welding electrode (5) enters into the two grinding half cylinders (671) until it drives the grinding half cylinders (671) to move and press the touch switch two (674), and then the driving structure is started to drive the grinding half cylinders (671) to rotate to grind the bottom end of the spot welding electrode (5); Receiving grooves (6711) are provided on both sides of the second circular cavity (64). The two receiving grooves (6711) are respectively arranged on the sides of the two grinding half cylinders (671) away from each other. Connecting blocks (675) are fixed on the sides of the two bottom plates (673) away from each other. Connecting block receiving grooves (6712) adapted to the connecting blocks (675) are provided on the sides of the two receiving grooves (6711) away from each other; Installation grooves (6713) are provided in the middle of the sides of the two receiving grooves (6711) away from each other. Telescopic devices (672) are fixed in the two installation grooves (6713). The piston rods of the telescopic devices (672) are connected to the outer sides of the grinding half cylinders (671) to receive the grinding half cylinders (671) in the receiving grooves (6711) after the bottom ends of the spot welding electrodes (5) are ground; 6. The intelligent welding device for the body-in-white sheet metal according to claim 5, characterized in that: Receiving cavities (676) are formed at the ends of the two grinding half cylinders (671) close to the bottom plates (673). Fixed guide rods (677) are fixed at the ends of the two bottom plates (673) close to the grinding half cylinders (671). The fixed guide rods (677) extend into the interior of the receiving cavities (676), and the ends of the fixed guide rods (677) away from the bottom plates (673) are connected to the inner walls of the receiving cavities (676) through second springs (678); T-shaped sliding grooves (679) are formed on the sides of the two grinding half cylinders (671) away from each other. T-shaped sliding blocks (6710) are fixed at the piston rod ends of the two telescopic devices (672). The T-shaped sliding blocks (6710) are slidably arranged in the T-shaped sliding grooves (679); 7. An intelligent welding device for a white body sheet metal according to claim 2, characterized in that: Dust suction mechanisms (68) for absorbing debris generated during grinding are provided at the top and bottom ends of the inner cylinder (62); The dust suction mechanisms (68) include annular grooves (681) formed inside the top and bottom ends of the inner cylinder (62). The two annular grooves (681) are respectively arranged outside the first circular cavity (63) and the third circular cavity (65). The first circular cavity (63) and the third circular cavity (65) are both communicated with the annular grooves (681) through a plurality of dust suction holes (682). Dust suction pipes (683) are fixed to the top and bottom outer walls of the inner cylinder (62). The two dust suction pipes (683) are respectively communicated with the two annular grooves (681), and the two dust suction pipes (683) are respectively arranged at the top and bottom of the outer cylinder (61); 8. An intelligent welding device for a white body sheet metal according to claim 1, characterized in that: The driving arm (4) includes a rotating arm (41). One end of the rotating arm (41) is arranged inside the support (3) and is rotatably connected to the support (3). A lifting driving device (42) is fixed to the other end of the rotating arm (41). A support plate (51) is fixed to the end of the spot welding electrode (5) close to the rotating arm (41). The piston rod end of the lifting driving device (42) is fixed to the support plate (51) for driving the spot welding electrode (5) to move up and down; The other end of the rotating arm (41) is provided with two guide rods (43) passing through. The two guide rods (43) are respectively arranged on both sides of the lifting driving device (42) and are slidably connected to the rotating arm (41). The two guide rods (43) are fixed to the support plate (51) and are used to guide the up and down movement of the spot welding electrode (5).

9. The intelligent welding device for the white body sheet metal according to claim 8, characterized in that: One ends of the two rotating arms (41) are drivingly connected, so that the two rotating arms (41) rotate in opposite directions, so as to drive the two spot welding electrodes (5) to open and enable the body-in-white sheet metal to enter between the two spot welding electrodes (5); during welding, the two spot welding electrodes (5) rotate closer, and then the lifting driving device (42) drives the spot welding electrodes (5) into the grinding assembly (6) and passes through the grinding assembly (6), and then the two spot welding electrodes (5) contact the body-in-white sheet metal for welding.

10. An intelligent welding device for a white body sheet metal according to claim 9, characterized in that: Link rods (7) are fixed to the outer walls of the outer cylinders (61) of the two grinding assemblies (6). A lead screw slide rail (8) for driving the two link rods (7) to move is fixed to one side of the bracket (3) close to the link rods (7), and the two link rods (7) move in opposite directions; When the two spot welding electrodes (5) are unfolded, the lead screw slide rail (8) drives the two grinding assemblies (6) to move away from each other. When the two spot welding electrodes (5) are combined, the lead screw slide rail (8) drives the two grinding assemblies (6) to move closer to each other.

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