Automatic wire feeding device for automobile frame welding robot

Abstract

This invention discloses an automatic wire feeding device for an automotive frame welding robot. A wire winding wheel for winding welding wire is rotatably mounted inside the mounting box via a wire winding shaft. A linear track is screwed into the mounting box, and an upper wire clamping structure and a lower wire clamping structure are sequentially mounted on the linear track from top to bottom. Two sets of symmetrically distributed fixing plates are provided at both ends of the upper and lower wire clamping structures, and the fixing plates are fixed to the inner wall of the mounting box. Movable grooves are formed on the fixing plates, and the upper and lower wire clamping structures are slidably connected to their corresponding movable grooves. A drive structure for driving the upper and lower wire clamping structures to feed the wire is also installed inside the mounting box. The two sets of wire clamping structures sequentially complete the cyclic action of clamping and feeding the wire, and releasing and resetting the wire, achieving continuous, stable, and non-retractable wire feeding, significantly improving wire feeding accuracy and stability, and effectively ensuring weld formation quality and welding precision.

Description

Technical Field

[0001] This invention relates to the field of welding equipment, and more particularly to an automatic wire feeding device for an automotive frame welding robot. Background Technology

[0002] In the automated welding production of automotive frames, welding robots require a stable, continuous, and precisely responsive wire feeding device to complete the welding operation. Existing wire feeding devices for welding robots mostly use rotating wire feeding wheels that rely on friction to push the welding wire. For thin or smooth welding wires (such as aluminum welding wire), prolonged contact and friction between the wire feeding wheel and the wire can cause the surface to become smooth, reducing the friction between the wire feeding roller and the welding wire, leading to slippage and unstable wire feeding. Furthermore, while existing technologies have proposed a peristaltic wire feeding principle using two alternating grippers, current solutions often require two or more drive sources (such as dual cylinders) to open, close, and move the grippers, resulting in a bulky structure and complex timing control. Summary of the Invention

[0003] The present invention provides an automatic wire feeding device for automotive frame welding robots, which solves the above-mentioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An automatic wire feeding device for an automotive frame welding robot includes a welding torch holder on the welding robot. A mounting frame and a mounting box are fixed to the welding torch holder. A wire feeding port is provided at the bottom of the mounting box. A wire guide tube for feeding welding wire is mounted on the mounting frame. The upper end of the wire guide tube extends into the wire feeding port of the mounting box. A wire winding wheel for winding and wrapping welding wire is rotatably mounted inside the mounting box via a wire winding shaft. A linear track is fixed inside the mounting box by screws. An upper wire clamping structure and a lower wire clamping structure are sequentially mounted on the outer side of the linear track from top to bottom. The upper and lower wire clamping structures each have two sets of symmetrically distributed fixing plates at their left and right ends. The fixing plates are fixed to the inner wall of the mounting box, and the fixing plates have movable grooves. The upper and lower wire clamping structures are slidably connected to the corresponding movable grooves. The mounting box also has a drive structure for driving the upper and lower wire clamping structures to feed the wire. The welding wire wound on the wire winding wheel passes through the upper and lower wire clamping structures and extends into the wire guide tube. Finally, it passes through the wire guide tube and is positioned in front of the welding gun for subsequent welding operations.

[0005] Preferably, a coil spring is sleeved on the wire winding shaft, the inner end of the coil spring is fixed to the lower end surface of the wire winding wheel, and the outer end of the coil spring is fixed to the inner wall of the mounting box. The coil spring causes the wire winding wheel to always have a clockwise rotation tendency. A wire guide roller for guiding the welding wire is also fixed inside the mounting box. During the wire feeding process, the welding wire is pulled by the upper and lower wire clamping structures, causing the winding wheel to rotate counterclockwise. The winding spring, in conjunction with the wire winding mechanism, causes the winding wheel to rotate clockwise, thus ensuring that the welding wire is always kept straight during the wire feeding process, preventing the wire from bending and causing poor wire feeding or blockage.

[0006] Preferably, the upper wire clamping structure includes a lifting slide plate that is slidably mounted on a linear track via a slider. Both the upper and lower ends of the lifting slide plate are welded with wire guide cylinders for threading wire. Two sets of symmetrically distributed translation plates are slidably mounted on the left and right ends of the lifting slide plate. Wire clamping heads are welded to the opposite ends of the two translation plates. Translation holes are provided on the translation plates, and ejector components are installed in the translation holes. A movable component is installed at the end of the translation plate away from the wire clamping head, and the movable component is slidably connected to a movable groove on a fixed plate. The upper wire clamping structure and the lower wire clamping structure are completely identical in structure.

[0007] Preferably, the ejector includes a translation guide block fixed on the lifting slide plate. The translation guide block is slidably inserted into the translation hole of the translation plate. A lifting spring is placed in the translation hole. The two ends of the lifting spring are fixed to the translation guide block and the inner wall of the translation hole, respectively. The lifting spring makes the two translation plates always tend to move away from each other.

[0008] Preferably, the movable component includes a fixed sleeve fixed to the translation plate, a stopper plate fixed on the fixed sleeve, and a through-hole opened at one end of the fixed sleeve away from the stopper plate, the through-hole extending rearward through the translation plate. A movable disk is slidably installed back and forth inside the fixed sleeve, and a movable roller is fixed at the rear end of the movable disk. The movable roller passes through the through-hole and extends into the movable groove. A downward pressure spring is placed inside the fixed sleeve, and the two ends of the downward pressure spring abut against the stopper plate and the movable disk, respectively. The downward pressure spring ensures that the movable roller always remains in contact with the inner wall of the movable groove.

[0009] Preferably, the moving groove includes a vertically downward-facing clamping groove and a release groove. The distance between the clamping groove and the lifting slide plate is less than the distance between the release groove and the lifting slide plate. The bottom ends of the clamping groove and the release groove are flush and connected by a horizontally distancing groove. The length of the clamping groove is greater than the length of the release groove. The top end of the release groove and the top end of the clamping groove are connected by an inclined approach groove.

[0010] Preferably, the depths of the far-away groove, the detachment groove, and the near-away groove are the same, the depth of the clamping groove is greater than the depth of the detachment groove, and the bottom ends of the far-away groove and the clamping groove are connected by a movable inclined plane. When the moving roller is away from the groove, away from the groove, or close to the inside of the groove, the pressure spring is in a compressed state. When the moving roller moves into the clamping groove, the pressure spring causes the moving roller to extend completely into the groove instantly. After the moving roller moves to the bottom of the clamping groove under the action of the lifting slide plate, the moving roller will move away from the groove through the moving inclined plane, and then move to the bottom of the groove. At this time, the two wire clamping heads move away from each other, releasing the clamping and fixing of the welding wire.

[0011] Preferably, in the initial state, the welding wire is threaded into the guide tubes in the upper and lower wire clamping structures. The moving roller in the upper wire clamping structure is at the top of the clamping groove, the distance between the two translation plates is the closest, and the two wire clamping heads clamp and fix the welding wire. At this time, the lifting spring in the upper wire clamping structure is in a compressed state, so that the two translation plates tend to move away from each other. In the lower wire clamping structure, the moving roller is located at the bottom of the release groove, the distance between the two translation plates is the farthest, and the two wire clamping heads are far away from the welding wire, so they will not clamp the welding wire. When the upper wire clamping structure moves to the bottom, the moving roller will be pushed out and moved to the bottom of the release groove under the action of the lifting spring. At this time, the distance between the two translation plates in the upper wire clamping structure is the farthest, and the two wire clamping heads are far away from the welding wire and will not clamp the welding wire. As the lower wire clamping structure moves upward along the groove to the uppermost part of the clamping groove, the two translation plates and the wire clamping head approach each other until the moving roller in the lower wire clamping structure is at the uppermost part of the clamping groove. At this point, the distance between the two translation plates is the closest, and the two wire clamping heads in the lower wire clamping structure clamp and fix the welding wire.

[0012] Preferably, the drive structure includes a reciprocating plate that slides left and right within the mounting box. Two sets of symmetrically distributed connecting plates are rotatably mounted on the upper and lower sides of the reciprocating plate via pivot pins. The two connecting plates are rotatably connected to the lifting slide plates in the upper and lower clamping wire structures via pivot pins, respectively. A servo motor is mounted in the mounting box via a bracket. A rotating wheel is fixed on the output shaft of the servo motor. An eccentric shaft is mounted on the rotating wheel. A rocker arm is rotatably mounted between the eccentric shaft and the reciprocating plate via pivot pins. They form a crank-rocker structure. The servo motor can make the reciprocating plate move back and forth in a straight line through the rotating wheel and the rocker. The rightmost reciprocating plate will make the upper clamping wire structure and the lower clamping wire structure move up and down through the connecting plate, and the upper clamping wire structure and the lower clamping wire structure move in opposite directions.

[0013] Preferably, the reciprocating plate has a strip-shaped reciprocating groove, and a guide is fixed inside the mounting box. The guide is slidably inserted into the reciprocating groove to guide the linear movement of the reciprocating plate. The guide is inserted into a strip block in the reciprocating groove. Limit blocks are fixed at both ends of the upper end of the strip block and slide in contact with the two sides of the reciprocating plate.

[0014] The beneficial effects of this invention are: 1. By setting up two sets of identical wire clamping mechanisms at the top and bottom, alternating clamping and reverse linkage wire feeding, the problem of easy slippage, intermittent wire feeding, and large speed fluctuation of traditional pressure roller wire feeding is fundamentally solved. The two sets of wire clamping structures complete the cyclic action of clamping and feeding wire and releasing and resetting wire in sequence, realizing continuous, stable and non-retractable wire feeding, significantly improving wire feeding accuracy and stability, providing a uniform and consistent wire supply for automotive frame welding, and effectively ensuring weld formation quality and welding accuracy.

[0015] 2. By setting up a wire winding wheel with a coiling spring and a wire guide roller in combination, a reverse tension force is continuously provided to the welding wire throughout the wire feeding process, so that the welding wire is always kept straight and taut, avoiding problems such as bending, curling, and stacking of the welding wire, completely eliminating faults such as poor wire feeding, wire blockage, and wire jamming, greatly reducing downtime for cleaning and debugging, and improving the operating efficiency of automated welding production lines.

[0016] 3. The clamping and loosening actions of the wire clamping structure are automatically completed by the trajectory of the moving groove and the spring drive, without the need for additional electronic control sensors and complex control programs. The mechanical action is reliable and highly synchronized, reducing the failure rate of the device and the later maintenance cost.

[0017] 4. The drive unit adopts a crank-rocker transmission mechanism, which provides smooth power transmission and rapid response. It can be precisely linked with the welding robot's movements, feeding wire synchronously only when welding starts and stopping immediately when welding stops. This avoids ineffective wire feeding when the robot is idling, reduces wire waste, and lowers production material costs. Attached Figure Description

[0018] Figure 1 This is a front view of an automatic wire feeding device for an automotive frame welding robot proposed in this invention; Figure 2 This is a diagram showing the installation position of an automatic wire feeding device for an automotive frame welding robot and the welding robot proposed in this invention. Figure 3 for Figure 2 Internal structure diagram of the mounting box; Figure 4 for Figure 3 Front view of the mounting box and its internal structure; Figure 5 for Figure 4 A schematic diagram of the upper and lower wire clamping structures and the rear side of the drive structure; Figure 6 for Figure 5 Schematic diagram of the upper and middle wire-clamped structure; Figure 7 for Figure 6 Exploded view of the upper wire-clamped structure; Figure 8 for Figure 6Schematic diagram of the middle fixing plate; Figure 9 for Figure 4 A schematic diagram of the driving structure.

[0019] Numbering on the map: 1. Welding torch holder; 2. Mounting bracket; 21. Guide wire tube; 3. Mounting box; 4. Winding wheel; 41. Winding spool; 42. Winding spring; 43. Guide roller; 5. Straight track; 6. Upper wire clamping structure; 61. Lifting slide plate; 611. Wire guide cylinder; 62. Translation plate; 621. Wire clamping head; 63. Translation guide block; 64. Lifting spring; 65. Moving part; 651. Fixed sleeve; 652. Moving roller; 653. Moving disc; 654. Lower pressure spring; 655. Stopper plate; 7. Lower wire clamping structure; 8. Fixed plate; 81. Moving groove; 82. Clamping groove; 83. Away from groove; 831. Moving inclined plane; 84. Disengaging from groove; 85. Approaching groove; 9. Drive structure; 91. Reciprocating plate; 92. Connecting plate; 93. Guide component; 94. Servo motor; 95. Rocker arm; 96. Rotating wheel; 97. Eccentric shaft. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Reference Figure 1 - Figure 9An automatic wire feeding device for an automotive frame welding robot includes a welding torch holder 1 on the welding robot, a mounting frame 2 and a mounting box 3 fixed on the welding torch holder 1, a wire feeding port at the bottom of the mounting box 3, a wire guide tube 21 for feeding welding wire mounted on the mounting frame 2, the upper end of the wire guide tube 21 extending into the wire feeding port of the mounting box 3, a wire winding wheel 4 for winding welding wire rotatably mounted inside the mounting box 3 via a wire winding shaft 41, a linear track 5 fixed inside the mounting box 3 by screws, and an upper wire clamping structure 6 and a lower wire clamping structure 7 sequentially mounted on the outer side of the linear track 5 from top to bottom. Two sets of symmetrically distributed fixing plates 8 are provided at both ends of the upper wire clamping structure 6 and the lower wire clamping structure 7. The fixing plates 8 are fixed to the inner wall of the mounting box 3. The fixing plates 8 are provided with moving grooves 81. The upper wire clamping structure 6 and the lower wire clamping structure 7 are slidably connected to the corresponding moving grooves 81. The mounting box 3 is also equipped with a drive structure 9 for driving the upper wire clamping structure 6 and the lower wire clamping structure 7 to feed the wire. The welding wire wound on the wire winding wheel 4 passes through the upper wire clamping structure 6 and the lower wire clamping structure 7 and extends into the wire guide tube 21. Finally, it passes through the wire guide tube 21 and is located at the front of the welding gun for subsequent welding operations.

[0022] Reference Figure 5 A coil spring 42 is sleeved on the wire winding shaft 41. The inner end of the coil spring 42 is fixed to the lower end surface of the wire winding wheel 4, and the outer end of the coil spring 42 is fixed to the inner wall of the mounting box 3. The coil spring 42 makes the wire winding wheel 4 always have a clockwise rotation tendency. A wire guide roller 43 for guiding the welding wire is also fixed inside the mounting box 3. The welding wire wound on the wire winding wheel 4 is gripped by the upper wire clamping structure 6 and the lower wire clamping structure 7 after passing through the wire guide roller 43 and is fed downward. During the wire feeding process, the welding wire is pulled by the upper wire clamping structure 6 and the lower wire clamping structure 7, causing the wire winding wheel 4 to rotate counterclockwise. The coiling spring 42, in conjunction with the wire winding wheel 4, makes the wire winding wheel 4 tend to rotate clockwise, thus ensuring that the welding wire is always in a straight state during the wire feeding process, avoiding wire bending during the wire feeding process, which could lead to poor wire feeding or wire blockage.

[0023] Reference Figure 3 - Figure 6 The upper wire clamping structure 6 includes a lifting slide plate 61 that is slidably mounted on a linear track 5 via a slider. Both the upper and lower ends of the lifting slide plate 61 are welded with wire guide cylinders 611 for threading wire. Two sets of symmetrically distributed translation plates 62 are slidably mounted on the left and right ends of the lifting slide plate 61. Wire clamping heads 621 are welded to the opposite ends of the two translation plates 62. Translation holes are opened on the translation plates 62, and ejector parts are installed in the translation holes. A moving part 65 is installed at the end of the translation plate 62 away from the wire clamping head 621. The moving part 65 is slidably connected to the moving groove 81 on the fixed plate 8. The upper wire clamping structure 6 and the lower wire clamping structure 7 have completely identical structures.

[0024] Reference Figure 6 , Figure 7The ejector includes a translation guide block 63 fixed on the lifting slide plate 61. The translation guide block 63 is slidably inserted into the translation hole of the translation plate 62. A lifting spring 64 is placed in the translation hole. The two ends of the lifting spring 64 are fixed to the translation guide block 63 and the inner wall of the translation hole, respectively. The lifting spring 64 makes the two translation plates 62 always tend to move away from each other.

[0025] Reference Figure 7 The movable component 65 includes a fixed sleeve 651 fixed on the translation plate 62. A stopper plate 655 is fixed on the fixed sleeve 651. A through-hole is opened at one end of the fixed sleeve 651 away from the stopper plate 655. The through-hole extends backward and passes through the translation plate 62. A movable disk 653 is slidably installed in the fixed sleeve 651. A movable roller 652 is fixed at the rear end of the movable disk 653. The movable roller 652 passes through the through-hole and extends into the movable groove 81. A downward pressure spring 654 is placed in the fixed sleeve 651. The two ends of the downward pressure spring 654 abut against the stopper plate 655 and the movable disk 653 respectively. The downward pressure spring 654 ensures that the movable roller 652 always keeps in contact with the inner wall of the movable groove 81.

[0026] Reference Figure 4 , Figure 8 The moving groove 81 includes a vertically downward-facing clamping groove 82 and a release groove 84. The distance between the clamping groove 82 and the lifting slide plate 61 is less than the distance between the release groove 84 and the lifting slide plate 61. The bottom ends of the clamping groove 82 and the release groove 84 are flush and connected by a horizontally distancing groove 83. The length of the clamping groove 82 is greater than the length of the release groove 84. The top end of the release groove 84 and the top end of the clamping groove 82 are connected by an inclined approach groove 85.

[0027] Reference Figure 8 The depths of the grooves away from 83, detached from 84, and near 85 are the same. The depth of the clamping groove 82 is greater than the depth of the detached groove 84. The bottom end of the groove away from 83 and the clamping groove 82 are connected by a movable inclined plane 831. When the moving roller 652 is away from the groove 83, away from the groove 84, and close to the inside of the groove 85, the lower pressure spring 654 is in a compressed state. When the moving roller 652 moves into the clamping groove 82, the lower pressure spring 654 causes the moving roller 652 to extend completely into the groove instantly. After the moving roller 652 moves to the bottom of the clamping groove 82 under the action of the lifting slide plate 61, the translation plate 62 will move instantaneously toward the end away from the welding wire under the action of the lifting spring 64. At this time, the moving roller 652 will move away from the groove 83 through the moving inclined surface 831, and then move to the bottom of the release groove 84. At this time, the two wire clamping heads 621 move away from each other, releasing the clamping and fixing of the welding wire. The moving roller 652 and the fixing plate 8 are both made of engineering ceramic materials, which have the advantages of low friction, high hardness and wear resistance.

[0028] Reference Figure 4 In the initial state, the welding wire is threaded into the wire guide cylinder 611 in the upper wire clamping structure 6 and the lower wire clamping structure 7. The moving roller 652 in the upper wire clamping structure 6 is at the top of the clamping groove 82. The distance between the two translation plates 62 is the closest. The two wire clamping heads 621 clamp and fix the welding wire. At this time, the lifting spring 64 in the upper wire clamping structure 6 is in a compressed state, which makes the two translation plates 62 tend to move away from each other. In the lower wire clamping structure 7, the moving roller 652 is located at the bottom of the release groove 84, the distance between the two translation plates 62 is the farthest, and the two wire clamping heads 621 are far away from the welding wire and will not clamp the welding wire. Then, under the action of the drive structure 9, the upper wire clamping structure 6 clamps the welding wire and moves downward along the clamping groove 82, while the lower wire clamping structure 7 moves upward along the release groove 84 and the approach groove 85. When the upper wire clamping structure 6 moves to the bottom, under the action of the lifting spring 64, the moving roller 652 will be pushed out and moved to the bottom of the release groove 84. At this time, the distance between the two translation plates 62 in the upper wire clamping structure 6 is the farthest, and the two wire clamping heads 621 are far away from the welding wire and will not clamp the welding wire. As the lower wire clamping structure 7 moves upward along the groove 85 to the uppermost part of the clamping groove 82, the two translation plates 62 and the wire clamping head 621 approach each other until the moving roller 652 in the lower wire clamping structure 7 is at the top of the clamping groove 82. At this time, the distance between the two translation plates 62 is the closest, and the two wire clamping heads 621 in the lower wire clamping structure 7 clamp and fix the welding wire. At this time, the upper wire clamping structure 6 moves upward to prepare to clamp and fix the welding wire again, while the lower wire clamping structure 7 pulls the welding wire downward to feed the wire. This cycle repeats, so that the welding wire can be continuously fed downward.

[0029] Reference Figure 4 , Figure 5 and Figure 9 The drive structure 9 includes a reciprocating plate 91 that slides left and right within the mounting box 3. Two sets of symmetrically distributed connecting plates 92 are rotatably mounted on the upper and lower sides of the reciprocating plate 91 via pivot pins. The two connecting plates 92 are rotatably connected to the lifting slide plates 61 in the upper clamping wire structure 6 and the lower clamping wire structure 7 via pivot pins. A servo motor 94 is mounted in the mounting box 3 via a bracket. A rotating wheel 96 is fixed on the output shaft of the servo motor 94. An eccentric shaft 97 is mounted on the rotating wheel 96. A rocker arm 95 is rotatably mounted between the eccentric shaft 97 and the reciprocating plate 91 via pivot pins. They form a crank-rocker structure. The servo motor 94 can make the reciprocating plate 91 move back and forth linearly left and right through the rotating wheel 96 and the rocker arm 95. The rightmost reciprocating plate 91 will cause the upper clamping wire structure 6 and the lower clamping wire structure 7 to move up and down through the connecting plate 92, and the movement directions of the upper clamping wire structure 6 and the lower clamping wire structure 7 are opposite.

[0030] Reference Figure 9 The reciprocating plate 91 has a reciprocating groove with a strip structure. A guide 93 is fixed in the mounting box 3. The guide 93 is slidably inserted into the reciprocating groove to guide the linear movement of the reciprocating plate 91. The guide 93 is inserted into a strip block in the reciprocating groove. Limit blocks are fixed at both ends of the upper end of the strip block and slide in contact with the two sides of the reciprocating plate 91.

[0031] Working principle: The welding wire is led out by the wire winding wheel 4, passes through the wire guide roller 43 and enters the wire guide cylinder 611 of the upper wire clamping structure 6 and the lower wire clamping structure 7, and is finally sent to the welding area of ​​the welding gun through the wire feeding guide tube 21, thus completing the initial wire threading and positioning of the welding wire.

[0032] When the welding robot starts welding, the welding signal synchronously triggers the servo motor 94 of the independent power drive structure 9 to operate. The output shaft of the servo motor 94 is fixedly connected to the rotating wheel 96 and drives the eccentric shaft 97 to rotate synchronously. The eccentric shaft 97 is hinged to one end of the rocker arm 95, and the other end of the rocker arm 95 is hinged to the reciprocating plate 91. Therefore, the rotational motion of the eccentric shaft 97 is converted into the linear reciprocating motion of the reciprocating plate 91 along the guide member 93 through the rocker arm 95. The reciprocating plate 91 is rotatably connected to the lifting slide plate 61 in the upper wire clamping structure 6 and the lower wire clamping structure 7 through the symmetrically arranged connecting plates 92, thereby driving the upper wire clamping structure 6 and the lower wire clamping structure 7 to perform opposite synchronous lifting and lowering motions along the linear track 5 in the mounting box 3. That is, when the upper wire clamping structure 6 moves down, the lower wire clamping structure 7 moves up, and when the upper wire clamping structure 6 moves up, the lower wire clamping structure 7 moves down.

[0033] During the downward movement of the upper wire clamping structure 6, the moving roller 652 is rolled and inserted into the clamping groove 82 of the fixed plate 8. At this time, the moving roller 652 is pressed against the bottom of the clamping groove 82 under the elastic force of the lower pressure spring 654. The two wire clamping heads 621 in the two upper wire clamping structures 6 are in a closed state, and the upper wire clamping structure 6 rigidly clamps the welding wire. With the continuous drive of the reciprocating plate 91, the upper wire clamping structure 6 moves downward along the clamping groove 82, thereby driving the clamped welding wire to be conveyed downward synchronously, completing a single wire feeding action. When the moving roller 652 moves to the bottom of the clamping groove 82 along with the upper wire clamping structure 6, under the action of the lifting spring 64, the two translation plates 62 and the moving part 65 in the upper wire clamping structure 6 will move away from each other, and the wire clamping heads 621 on the two translation plates 62 will also move away, thereby releasing the clamping and fixing of the welding wire. Meanwhile, the moving roller 652 will slide along the moving inclined surface 831 at the end of the clamping groove 82 away from the groove 83. During this process, the moving inclined surface 831 gradually pushes the moving roller 652 outward, overcoming the elastic force of the lower pressure spring 654. The lower pressure spring 654 is in a compressed state. Subsequently, the reciprocating plate 91 drives the upper wire clamping structure 6 to reset upward along the straight track 5. The moving roller 652 moves along the groove away from the groove 83 and the release groove 84 until it returns to the initial upward position, waiting for the next clamping and wire feeding.

[0034] Meanwhile, during the upward movement of the lower wire clamping structure 7, its moving roller 652 first enters the release groove 84 of the fixed plate 8, at which time the wire clamping head 621 of the lower wire clamping structure 7 is in an open state. When the moving roller 652 moves with the lower wire clamping structure 7 to the junction of the release groove 84 and the approach groove 85, the moving roller 652 is pushed into the approach groove 85. As the moving roller 652 moves upward along the approach groove 85 to the clamping groove 82, the two wire clamping heads 621 approach each other and continue to move upward with the lower wire clamping structure 7. When the moving roller 652 slides into the upper end of the clamping groove 82, the two translation plates 62 respectively drive the wire clamping head 621 to close, realizing the clamping of the welding wire by the lower wire clamping structure 7. Subsequently, the lower wire clamping structure 7 moves downward along the clamping groove 82 under the drive of the reciprocating plate 91, taking over from the upper wire clamping structure 6 to continue feeding the welding wire downward, ensuring that the welding wire is uninterrupted and does not retract during the entire wire feeding process.

[0035] The clamping, moving, and resetting actions of the upper wire clamping structure 6 and the lower wire clamping structure 7 are performed alternately and cyclically to achieve continuous and stable downward feeding of the welding wire. The independent power drive structure 9 only operates synchronously when the welding robot starts welding. When welding stops, the servo motor 94 stops immediately, the reciprocating plate 91 stops reciprocating, and the wire feeding action terminates synchronously. This effectively avoids the defect of continuous wire feeding when the robot is moving and not welding, and ensures the accuracy of wire feeding and the utilization rate of welding wire.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic wire feeding device for an automotive frame welding robot, characterized in that, The welding robot includes a welding torch holder (1), on which a mounting frame (2) and a mounting box (3) are fixed. A wire threading port is provided at the bottom of the mounting box (3). A wire guide tube (21) for threading the welding wire is mounted on the mounting frame (2). The upper end of the wire guide tube (21) extends into the wire threading port of the mounting box (3). A wire winding wheel (4) for winding and wrapping the welding wire is rotatably mounted inside the mounting box (3) via a wire winding shaft (41). A linear track (5) is fixed inside the mounting box (3) by screws. The outer surface of the linear track (5)... The upper wire clamping structure (6) and the lower wire clamping structure (7) are installed sequentially from top to bottom on the side. Two sets of symmetrically distributed fixing plates (8) are provided at both ends of the upper wire clamping structure (6) and the lower wire clamping structure (7). The fixing plates (8) are fixed to the inner wall of the mounting box (3). The fixing plates (8) are provided with moving grooves (81). The upper wire clamping structure (6) and the lower wire clamping structure (7) are slidably connected to the corresponding moving grooves (81). The mounting box (3) is also equipped with a driving structure (9) for driving the upper wire clamping structure (6) and the lower wire clamping structure (7) to feed wire.

2. The automatic wire feeding device for an automotive frame welding robot according to claim 1, characterized in that, A coil spring (42) is sleeved on the coiling shaft (41). The inner end of the coil spring (42) is fixed to the lower end surface of the coiling wheel (4). The outer end of the coil spring (42) is fixed to the inner wall of the mounting box (3). A wire guide roller (43) for guiding the welding wire is also fixed inside the mounting box (3).

3. The automatic wire feeding device for an automotive frame welding robot according to claim 1, characterized in that, The upper wire clamping structure (6) includes a lifting slide plate (61) that is slidably mounted on a straight track (5) via a slider. Both the upper and lower ends of the lifting slide plate (61) are welded with wire guide cylinders (611) for threading wire. Two sets of symmetrically distributed translation plates (62) are slidably mounted on the left and right ends of the lifting slide plate (61). Wire clamping heads (621) are welded to the opposite ends of the two translation plates (62). Translation holes are provided on the translation plates (62), and ejector components are installed in the translation holes. A moving part (65) is installed on the end of the translation plate (62) away from the wire clamping head (621). The moving part (65) is slidably connected to the moving groove (81) on the fixed plate (8). The upper wire clamping structure (6) and the lower wire clamping structure (7) have completely identical structures.

4. The automatic wire feeding device for an automotive frame welding robot according to claim 3, characterized in that, The ejector includes a translation guide block (63) fixed on the lifting slide plate (61). The translation guide block (63) is slidably inserted into the translation hole of the translation plate (62). A lifting spring (64) is placed in the translation hole. The two ends of the lifting spring (64) are fixed to the translation guide block (63) and the inner wall of the translation hole, respectively.

5. The automatic wire feeding device for an automotive frame welding robot according to claim 3, characterized in that, The movable component (65) includes a fixed sleeve (651) fixed on a translation plate (62), a stopper plate (655) fixed on the fixed sleeve (651), and a through hole at one end of the fixed sleeve (651) away from the stopper plate (655), the through hole extending backward through the translation plate (62). A movable disk (653) is slidably installed in the fixed sleeve (651), and a movable roller (652) is fixed at the rear end of the movable disk (653). The movable roller (652) passes through the through hole and extends into the movable groove (81). A downward pressure spring (654) is placed in the fixed sleeve (651), and the two ends of the downward pressure spring (654) abut against the stopper plate (655) and the movable disk (653) respectively.

6. The automatic wire feeding device for an automotive frame welding robot according to claim 5, characterized in that, The moving groove (81) includes a vertically downward-facing clamping groove (82) and a release groove (84). The distance between the clamping groove (82) and the lifting slide plate (61) is less than the distance between the release groove (84) and the lifting slide plate (61). The bottom ends of the clamping groove (82) and the release groove (84) are flush and connected by a horizontal distance groove (83). The length of the clamping groove (82) is greater than the length of the release groove (84). The top end of the release groove (84) and the top end of the clamping groove (82) are connected by an inclined proximity groove (85).

7. The automatic wire feeding device for an automotive frame welding robot according to claim 6, characterized in that, The depths of the far-away groove (83), the detachment groove (84), and the near-away groove (85) are the same. The depth of the clamping groove (82) is greater than the depth of the detachment groove (84). The bottom ends of the far-away groove (83) and the clamping groove (82) are connected by a movable inclined plane (831).

8. An automatic wire feeding device for an automotive frame welding robot according to claim 7, characterized in that, When the moving roller (652) in the upper wire clamping structure (6) is at the top of the clamping groove (82), the distance between the two translation plates (62) in the upper wire clamping structure (6) is the closest, and the two wire clamping heads (621) clamp and fix the welding wire. At this time, the moving roller (652) in the lower wire clamping structure (7) is at the bottom of the release groove (84), the distance between the two translation plates (62) in the lower wire clamping structure (7) is the farthest, and the two wire clamping heads (621) are far away from the welding wire. When the upper wire clamping structure (6) moves to the bottom, the moving roller (652) in the upper wire clamping structure (6) is at the bottom of the release groove (84). At this time, the distance between the two translation plates (62) in the upper wire clamping structure (6) is the farthest, and the two wire clamping heads (621) are far away from the welding wire. At this time, the moving roller (652) in the lower wire clamping structure (7) is at the top of the clamping groove (82), and the distance between the two translation plates (62) is the closest. The two wire clamping heads (621) in the lower wire clamping structure (7) clamp and fix the welding wire.

9. An automatic wire feeding device for an automotive frame welding robot according to claim 3, characterized in that, The drive structure (9) includes a reciprocating plate (91) that slides left and right in the mounting box (3). Two sets of symmetrically distributed connecting plates (92) are rotatably mounted on the upper and lower sides of the reciprocating plate (91) through shaft pins. The two connecting plates (92) are rotatably connected to the lifting slide plate (61) in the upper clamping wire structure (6) and the lower clamping wire structure (7) through shaft pins respectively. A servo motor (94) is mounted in the mounting box (3) through a bracket. A rotating wheel (96) is fixed on the output shaft of the servo motor (94). An eccentric shaft (97) is mounted on the rotating wheel (96). A rocker arm (95) is rotatably mounted between the eccentric shaft (97) and the reciprocating plate (91) through shaft pins.

10. An automatic wire feeding device for an automotive frame welding robot according to claim 9, characterized in that, The reciprocating plate (91) has a strip-shaped reciprocating groove, and the mounting box (3) has a guide (93) fixed inside, which is slidably inserted into the reciprocating groove.

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