Gantry spot welding machine

Abstract

The present application relates to point row welding machine technical field, especially provide gantry type point row welding machine, including the crossbeam plate of horizontal arrangement, and at least two groups of welding rod components are arranged along the horizontal direction of the crossbeam plate, the welding rod component includes welding electrode rod and elastic buffer assembly, the elastic buffer assembly is installed on the crossbeam plate, and is connected with the welding electrode rod, is used for driving the welding electrode rod along vertical direction elastic float, to adapt to the relief of the surface of the component to be welded, it further includes linkage fine adjustment mechanism, the linkage fine adjustment mechanism is connected between the welding electrode rod of adjacent two groups of welding rod components and the elastic buffer assembly, through the gear rack linkage transmission drive welding electrode rod relative assembly sleeve secondary upward fine adjustment, realize secondary avoidance protection under the condition of excessive convex, adopt linkage and realize the twice overload extrusion of electrode rod Unload effect, simple structure.

Description

Technical Field

[0001] This invention relates to the field of spot welding machine technology, and particularly to a gantry-type spot welding machine. Background Technology

[0002] Gantry spot welding machines are widely used in plate butt welding and batch spot welding of workpieces. They rely on multiple welding rod assemblies moving synchronously downwards to complete multi-point welding operations, offering advantages such as high processing efficiency and suitability for mass production. They are widely used in industrial production scenarios such as hardware processing and plate welding. Currently, traditional gantry spot welding machines mostly use fixed or single elastic buffer structures for their welding electrode rods, limiting their vertical floating adjustment capability and making them suitable only for welding workpieces with relatively flat surfaces. In actual production, the workpieces to be welded are often affected by factors such as processing technology, stamping, and plate material errors, resulting in irregular surfaces with unevenness. Existing welding equipment cannot achieve adaptive and precise adjustment based on the surface irregularities of the workpiece, making it difficult to adapt to the welding processing needs under complex working conditions.

[0003] In the existing technology, conventional single elastic buffer structure can only achieve simple one-time avoidance compensation. When the workpiece protrusion height is large, the single buffer structure is easily compressed to the limit failure, causing rigid compression between the electrode tip and the protruding part of the workpiece, which in turn leads to defects such as workpiece burn-through and electrode sticking. At the same time, it cannot achieve adaptive sinking compensation for the concave area of ​​the workpiece, which easily leads to poor electrode adhesion, greatly affecting the welding quality of the workpiece. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a gantry-type spot welding machine, comprising a horizontally arranged crossbeam plate and at least two sets of welding rod assemblies arranged horizontally along the crossbeam plate. Each welding rod assembly includes a welding electrode rod and an elastic buffer assembly. The elastic buffer assembly is mounted on the crossbeam plate and connected to the welding electrode rod, driving the welding electrode rod to elastically float vertically to adapt to the undulations of the surface of the welded component. The machine also includes a linkage fine-tuning mechanism. This linkage fine-tuning mechanism is connected between the welding electrode rod and the elastic buffer assembly in two adjacent sets of welding rod assemblies. When any welding electrode rod moves excessively upward due to contact with a protrusion of the welded component, its upward movement is transmitted to the linkage fine-tuning mechanism through the elastic buffer assembly, and the linkage fine-tuning mechanism drives the adjacent welding electrode rod to make an additional micro-movement in the same direction relative to its own elastic buffer assembly.

[0005] As a further preferred embodiment, the elastic buffer assembly includes: a guide sleeve fixedly installed on the crossbeam plate, and a sliding handle slidably disposed within the guide sleeve; the sliding handle is elastically connected to the crossbeam plate via a buffer spring; and the welding electrode rod is connected to the bottom of the sliding handle via an assembly sleeve.

[0006] As a further preferred embodiment, one end of the sliding handle passes through the top of the guide sleeve and is provided with a connecting flange, the size of which is larger than the diameter of the guide sleeve.

[0007] As a further preferred embodiment, the buffer spring is sleeved on the outside of the sliding handle, with its upper end abutting against the crossbeam plate and its lower end abutting against the assembly sleeve.

[0008] As a further preferred embodiment, the assembly sleeve has a sliding assembly cavity inside; the top end of the welding electrode rod has a sliding adapter, which is slidably assembled in the sliding assembly cavity and can move relative to it in the vertical direction.

[0009] As a further preferred embodiment, the linkage fine-tuning mechanism includes a transmission gear set and a rack set meshing with the transmission gear set; the rack set includes a vertical large rack and a vertical small rack; the vertical large rack is fixedly connected to the assembly sleeve, the side of the assembly sleeve has a guide groove vertically formed, a connecting rod is connected to the sliding adapter, the connecting rod passes through the guide groove to reach the outside of the assembly sleeve, and the vertical small rack is fixedly connected to the connecting rod; the transmission gear set is rotatably connected to the longitudinal connecting plate between adjacent welding rod assemblies, and simultaneously meshes with the vertical large rack and the vertical small rack. The transmission gear set includes a large transmission gear and a small linkage gear fixedly connected coaxially. The large vertical rack meshes with the large transmission gear, and the small vertical rack meshes with the small linkage gear. When the bottom end of the welding electrode rod contacts the workpiece protrusion, the mounting sleeve moves upward and compresses the buffer spring. At the same time, the large vertical rack drives the large transmission gear and the small linkage gear to rotate clockwise. Then, the small linkage gear drives the small vertical rack to move the welding electrode rod further upward relative to the mounting sleeve, so as to achieve adaptive fine adjustment and protection.

[0010] As a further preferred embodiment, the sliding handle has a through hole extending from one end of the connecting flange to the other end, the through hole communicating with the sliding assembly cavity, and the terminal of the welding electrode rod is located inside the sliding assembly cavity to output the electrical connection wire outward through the through hole.

[0011] As a further preferred embodiment, the welding electrode rod has a sliding adapter at one end located within the sliding assembly cavity. The sliding adapter is in close contact with the cavity wall of the sliding assembly cavity to achieve a sliding fit. The diameter of the sliding adapter is larger than the diameter of the welding electrode rod at one end within the sliding assembly cavity. An inner lining spring is provided within the sliding assembly cavity, sleeved around the welding electrode rod. The top end of the inner lining spring vertically upward abuts against the top of the sliding assembly cavity, and the bottom end vertically downward abuts against the sliding adapter. The supporting strength of the inner lining spring is greater than the supporting strength of the buffer spring.

[0012] The advantages of this invention compared to the prior art are: By setting up an elastic buffer assembly consisting of a guide sleeve, a sliding handle, a mounting sleeve, and a buffer spring, the welding electrode rod can be elastically floated upward in the vertical direction to avoid the undulations of the workpiece surface. The elastic deformation of the buffer spring counteracts the hard squeezing force brought by the workpiece protrusion, effectively avoiding rigid compression between the electrode tip and the protruding position of the workpiece, and reducing welding defects such as workpiece burn-through and electrode sticking.

[0013] By installing a meshing transmission large gear, linkage small gear, and vertical large rack and vertical small rack on the outer wall of the assembly sleeve, a linkage fine-adjustment mechanism can be set up. When the workpiece protrusion height is too large and the buffer spring compression is close to the limit, the welding electrode rod can be driven to make a secondary upward fine adjustment relative to the assembly sleeve through gear and rack linkage transmission. This achieves secondary avoidance protection under excessive protrusion conditions, further eliminates overload extrusion stress, and can effectively avoid welding defects such as workpiece burn-through and electrode sticking caused by excessive contact pressure between the workpiece protrusion to be welded area and the electrode head.

[0014] Through the coordinated operation of the linkage fine-tuning mechanism and the elastic buffer component, when the workpiece is concave, the elastic extension of the buffer spring and the reverse transmission of the gear rack can help the welding electrode rod to extend downward adaptively to compensate for the concave drop, so that the end of the welding electrode rod is always in contact with the welding surface of the workpiece, effectively avoiding quality problems such as incomplete welding and missing welding caused by poor electrode contact in the concave area of ​​the workpiece. Attached Figure Description

[0015] Figure 1 A front view schematic diagram of a gantry-type spot welding machine provided for an embodiment of the present invention; Figure 2 A schematic diagram of a gantry-type spot welding machine provided in an embodiment of the present invention from a first-view perspective; Figure 3 The gantry spot welding machine provided for the embodiments of the present invention consists of... Figure 1 Enlarged schematic diagram of part A; Figure 4 A schematic diagram of the gantry-type spot welding machine after being cut open, as provided in an embodiment of the present invention; Figure 5 The gantry spot welding machine provided for the embodiments of the present invention consists of... Figure 4 Enlarged schematic diagram of section B; Figure 6 A schematic diagram of a gantry-type spot welding machine provided in an embodiment of the present invention from a second perspective; Figure 7 The gantry spot welding machine provided for the embodiments of the present invention consists of... Figure 6 An enlarged schematic diagram of section C.

[0016] In the diagram: 1. Crossbeam plate; 2. Connecting rod; 3. Welding rod assembly; 4. Longitudinal connecting plate; 5. Guide sleeve; 6. Sliding lifting handle; 7. Assembly sleeve; 8. Welding electrode rod; 9. Buffer spring; 10. Sliding assembly cavity; 12. Guide groove; 13. Transmission large gear; 14. Linkage small gear; 15. Vertical large rack; 16. Vertical small rack; 17. Connecting flange; 18. Through hole; 19. Sliding adapter; 20. Inner lining spring. Detailed Implementation

[0017] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] In one implementation, such as Figures 1-7 As shown: This embodiment provides a gantry-type spot welding machine, including a horizontally arranged crossbeam plate 1 and at least two sets of welding rod assemblies 3 arranged horizontally along the crossbeam plate 1. The welding rod assembly 3 includes a welding electrode rod 8 and an elastic buffer assembly. The elastic buffer assembly is mounted on the crossbeam plate 1 and connected to the welding electrode rod 8, and is used to drive the welding electrode rod 8 to float elastically in the vertical direction to adapt to the undulations of the surface of the part to be welded. The gantry-type spot welding machine also includes a linkage fine adjustment mechanism. The linkage fine adjustment mechanism is connected between the welding electrode rod 8 and the elastic buffer assembly of two adjacent sets of welding rod assemblies 3. When any welding electrode rod 8 moves upward excessively due to contact with the protrusion of the part to be welded, its upward movement is transmitted to the linkage fine adjustment mechanism through the elastic buffer assembly, and the linkage fine adjustment mechanism drives the adjacent welding electrode rod 8 to make an additional fine movement in the same direction relative to its own elastic buffer assembly.

[0019] In use, the drive component of the gantry spot welding machine moves the crossbeam plate 1 downward, and the crossbeam plate 1 simultaneously moves each group of welding rod assemblies 3 downward. The welding electrode rods 8 in the welding rod assembly 3 move downward simultaneously and press against the surface of the workpiece to be welded and perform high-temperature spot welding to realize the workpiece butt welding operation. After the spot welding is completed, the crossbeam plate 1 moves all the welding rod assemblies 3 to lift and reset, completing the single welding retraction. This is the conventional welding when the workpiece surface is flat.

[0020] When the end of the welding electrode rod 8 contacts the protruding part of the workpiece, the workpiece pushes the welding electrode rod 8 upward. The welding electrode rod 8, through the matching sleeve 7, drives the sliding handle 6 to slide upward along the guide sleeve 5. The buffer spring 9, sleeved on the outside of the sliding handle 6, is compressed and deformed. Relying on the elastic contraction of the buffer spring 9, the welding electrode rod 8 floats upward to avoid the protrusion. The elastic buffering offsets the hard pressure brought by the protrusion, avoiding excessive pressure from the electrode tip on the workpiece, which may cause weld burn-through or weld sticking. If the height of the protrusion is too high, the buffer spring 9 continues to compress and approaches its limit. As the mounting cylinder 7 continues to move upward, the vertical rack 15 fixed to the outer wall of the mounting cylinder 7 moves upward synchronously. The vertical rack 15 meshes with the transmission gear 13, which drives the coaxial fixed linkage pinion 14 to rotate clockwise synchronously. The linkage pinion 14 meshes with and drives the vertical rack 16 to lift upward. The vertical rack 16 pulls the sliding adapter 19 of the welding electrode rod 8, causing the welding electrode rod 8 to be finely adjusted upward relative to the mounting cylinder 7 again, forming a secondary avoidance protection, further isolating the electrode from the overload compression of the protruding workpiece.

[0021] When the end of the welding electrode rod 8 corresponds to the flat area of ​​the workpiece, the buffer spring 9 releases its elastic potential energy and extends, driving the mounting sleeve 7 and the welding electrode rod 8 to return to their original position downwards, and the electrode tip stably contacts the workpiece surface for welding. If the electrode tip is aligned with the recessed position of the workpiece, the buffer spring 9 extends further, pulling the sliding handle 6 and the mounting sleeve 7 to move downwards along the guide sleeve 5 as a whole. During the downward movement of the mounting sleeve 7, the vertical large rack 15 moves downwards. After the transmission large gear 13 and the linkage small gear 14 reverse the transmission, the vertical small rack 16 moves downwards synchronously, assisting the welding electrode rod 8 to extend downwards relative to the mounting sleeve 7, compensating for the height difference caused by the recess, and ensuring that the end of the welding electrode rod 8 always contacts the welding surface of the workpiece.

[0022] Specifically, the elastic buffer assembly includes: a guide sleeve 5 fixedly installed on the crossbeam plate 1, and a sliding handle 6 slidably disposed within the guide sleeve 5; the sliding handle 6 is elastically connected to the crossbeam plate 1 through a buffer spring 9; and the welding electrode rod 8 is connected to the bottom of the sliding handle 6 through a mounting sleeve 7.

[0023] Specifically, one end of the sliding handle 6 passes through the top of the guide sleeve 5 and is provided with a connecting flange 17, the size of which is larger than the diameter of the guide sleeve 5.

[0024] Specifically, the buffer spring 9 is sleeved on the outside of the sliding handle 6, with its upper end abutting against the crossbeam plate 1 and its lower end abutting against the mounting sleeve 7.

[0025] Specifically, the assembly sleeve 7 has a sliding assembly cavity 10 inside; the top of the welding electrode rod 8 has a sliding adapter 19, which is slidably assembled in the sliding assembly cavity 10 and can move relative to it in the vertical direction.

[0026] Specifically, the linkage fine-tuning mechanism includes a transmission gear set and a rack set meshing with the transmission gear set; the rack set includes a vertical large rack 15 and a vertical small rack 16; the vertical large rack 15 is fixedly connected to the mounting sleeve 7, the mounting sleeve 7 has a guide groove 12 vertically opened on its side, a connecting rod 2 is connected to the sliding adapter 19, the connecting rod 2 passes through the guide groove 12 to reach the outside of the mounting sleeve 7, and the vertical small rack 16 is fixedly connected to the connecting rod 2; the transmission gear set is rotatably connected to the longitudinal connecting plate 4 between the adjacent welding rod assembly, and simultaneously connected to the vertical large rack 15 and the vertical small rack 16. 6. The transmission gear set includes a large transmission gear 13 and a small linkage gear 14 that are coaxially fixedly connected; the vertical large rack 15 meshes with the large transmission gear 13; the vertical small rack 16 meshes with the small linkage gear 14. When the bottom end of the welding electrode rod 8 contacts the protrusion of the workpiece, the mounting sleeve 7 moves upward and compresses the buffer spring 9. At the same time, the large transmission gear 13 and the small linkage gear 14 are driven to rotate clockwise through the vertical large rack 15. Then, the small linkage gear 14 drives the vertical small rack 16 to move the welding electrode rod 8 further upward relative to the mounting sleeve 7, so as to achieve adaptive fine adjustment and protection.

[0027] The transmission gear set is rotated as a whole on the longitudinal connecting plate 4 between two adjacent sets of welding rod assemblies 3, ensuring that the gear set is fixed in position and rotates stably. The transmission large gear 13 meshes with the vertical large rack 15, and the linkage small gear 14 meshes with the vertical small rack 16. Differentiated linkage transmission is achieved by utilizing the characteristic of the large and small gears rotating synchronously on the same axis. During actual welding operations, when the bottom end of the welding electrode rod 8 contacts the protruding part of the workpiece and is supported, the welding electrode rod 8 drives the entire assembly sleeve 7 to move upward and compress the buffer spring 9, so that the welding electrode rod 8 completes an adaptive lifting protection relative to the protruding area, but does not completely separate from the welding area. The pressure of the electrode head relative to the welding area of ​​the workpiece is moderate to avoid weld penetration and adhesion. At the same time as the assembly sleeve 7 moves upward, the vertical large rack 15 on the outer wall moves upward synchronously with it. Through the meshing relationship of the rack and pinion, it drives the transmission large gear 13 to rotate clockwise. Since the transmission large gear 13 and the linkage small gear 14 are coaxially fixed, they maintain synchronous and same angle rotation. The clockwise rotating linkage small gear 14 further drives the vertical small rack 16 to move upward. Finally, the vertical small rack 16 pulls the sliding adapter part 19 and the entire welding electrode rod 8 to adjust upward slightly relative to the assembly sleeve 7 again, realizing the secondary adaptive lifting protection of the welding electrode rod 8. Through this mechanical linkage structure, when the workpiece protrusion is large and the single spring buffer reaches its limit, the welding electrode rod 8 can be automatically subjected to additional force relief and avoidance, further offsetting the hard extrusion force between the electrode and the protruding part of the workpiece, effectively avoiding welding defects such as workpiece burn-through and electrode sticking caused by high pressure and strong contact, and improving welding quality.

[0028] Specifically, the sliding handle 6 has a through hole 18 extending from one end of the connecting flange 17 to the other. The through hole 18 communicates with the sliding assembly cavity 10. The wiring terminal of the welding electrode rod 8 is located inside the sliding assembly cavity 10, allowing the electrical connection wires to be output outward through the through hole 18. The through hole 18 is interconnected with the sliding assembly cavity 10 inside the assembly sleeve 7. The electrical wiring terminal of the welding electrode rod 8 is arranged inside the sliding assembly cavity 10. The electrical connection wires required by the electrode can be led outward through the through hole 18. The overall wiring is neat and compact, and it can effectively avoid the pulling, tangling, and interference of the wires during the vertical floating adjustment of the welding electrode rod 8, ensuring smooth and stable equipment adjustment.

[0029] Specifically, the welding electrode rod 8 has a sliding adapter 19 at one end located inside the sliding assembly cavity 10. The sliding adapter 19 is in close contact with the cavity wall of the sliding assembly cavity 10 to achieve a sliding fit. This can provide radial limiting and guiding for the vertical sliding movement of the welding electrode rod 8, effectively limiting electrode wobbling and deviation. The diameter of the sliding adapter 19 is larger than the diameter of the end of the welding electrode rod 8 located inside the sliding assembly cavity 10. An inner lining spring 20 is provided inside the sliding assembly cavity 10 and sleeved around the welding electrode rod 8. The top end of the inner lining spring 20 is vertically upward and abuts against the top of the sliding assembly cavity 10, and the bottom end is vertically downward and abuts against the sliding adapter 19. The supporting strength of the inner lining spring 20 is greater than the supporting strength of the buffer spring 9. The inner liner spring 20 has higher rigidity and compression resistance than the buffer spring 9. This makes the inner liner spring 20 more rigid and less prone to compression deformation during normal welding and when encountering small protrusions of the workpiece. It can always maintain a stable support state. The buffer spring 9 will preferentially undergo elastic compression to achieve a first-level floating avoidance of the welding electrode rod 8 relative to the protruding welding area. Only when the height of the workpiece protrusion is too large, the compression of the buffer spring 9 approaches its limit, and the upward displacement of the overall structure reaches a threshold, will the top pressure exceeding the conventional buffer stroke overcome the rigid support of the inner liner spring 20, forcing the inner liner spring 20 to be compressed and contracted. This achieves a two-level elastic step-by-step avoidance effect, with the buffer spring 9 floating over a large range and the inner liner spring 20 compressing precisely and slightly. This, combined with the subsequent linkage fine-tuning mechanism, completes the secondary adaptive fine-tuning action of the welding electrode rod 8, ensuring the stable realization of the adaptive welding function of the welding electrode rod 8 with graded buffering and progressive protection.

[0030] In this invention, all welding electrode rods 8 are mounted on the same crossbeam plate 1, which is mounted on the gantry. This invention does not change the original driving method, such as moving back and forth with the gantry or moving up and down along the gantry.

[0031] In use, under the existing technology of gantry spot welding machine, the crossbeam plate 1 drives all the welding rod assemblies 3 to move downwards. The welding electrode rods 8 of each welding rod assembly 3 move downwards synchronously and press against the surface of the upper workpiece to be welded at high temperature, so that the upper and lower workpieces are connected. This is the normal welding action achieved by each welding rod assembly 3 under normal conditions. After welding is completed, the crossbeam plate 1 drives all the welding rod assemblies 3 to move upwards to complete the retraction.

[0032] In abnormal situations: when the end of an individual welding electrode rod 8 (electrode head) touches the protruding part of the workpiece due to a local protrusion, the welding electrode rod 8 is first lifted by the workpiece, and the sliding adapter 19 slides upward along the sliding assembly cavity 10 inside the mounting sleeve 7. Since the support strength of the inner lining spring 20 is greater than the support strength of the buffer spring 9, the inner lining spring 20 will not be easily compressed at this time, and pushes the mounting sleeve 7 upward through its original support state. The mounting sleeve 7 pushes the sliding handle 6 upward along the guide sleeve 5. Under the guidance of the guide sleeve 5, the movement is ensured to be smooth. At the same time, the buffer spring 9 will be compressed. Relying on this compression deformation of the buffer spring 9, the first small upward floating compensation of the welding electrode rod 8 is completed. During this process, the mounting sleeve 7 and the sliding handle 6 move upward synchronously, and the buffer spring 9 is compressed, so that the electrode head at the bottom of the welding electrode rod 8 is buffered and protected, while avoiding excessive compression between the electrode head and the protruding welding area, which may result in technical defects such as weld penetration and sticking.

[0033] As mentioned above, if the height of the protruding area of ​​the workpiece is too large, when the buffer spring 9 continues to compress towards its limit, the mounting sleeve 7 continues to move upward. During the upward movement, it drives the vertical large rack 15 fixed on its outer wall to move upward synchronously. The vertical large rack 15 meshes with and drives the transmission large gear 13 and the coaxially fixed linkage small gear 14 to rotate clockwise. The linkage small gear 14 pulls the vertical small rack 16 to move upward, thereby pulling the sliding adapter 19 and the welding electrode rod 8 to be lifted again relative to the mounting sleeve 7. The inner lining spring 20 is compressed, providing a stroke for the welding electrode rod 8 to rise on its own. Finally, the electrode head of the welding electrode rod 8 is further protected from excessive compression of the protruding welding area, and technical defects such as weld penetration and sticking are further avoided.

[0034] When the welding electrode rod 8 is in a normal horizontal position, the workpiece cannot exert a protruding force on the electrode head at the bottom of the welding electrode rod 8. The pre-compressed inner spring 20 and buffer spring 9 will release their elasticity and extend, pushing the sliding adapter 19 to cause the welding electrode rod 8 to extend downwards relative to the mounting sleeve 7, pushing the mounting sleeve 7 itself downwards. This achieves small-stroke sinking compensation, ensuring the electrode head always rests on the welding area. If a concave area is encountered on the workpiece, and the concave area is relatively deep, after the inner spring 20 extends to its maximum stroke, the buffer spring 9 simultaneously releases pressure and extends, pushing the sliding adapter 19... The movable lifting handle 6 and the mounting sleeve 7 slide downward along the guide sleeve 5, driving the welding electrode rod 8 to move downward synchronously to compensate for the large stroke sinking. During this process, the mounting sleeve 7 moves downward with the buffer spring 9, which drives the vertical large rack 15 downward. Through the gear pair transmission, the vertical small rack 16 moves downward, assisting the welding electrode rod 8 to extend further downward, ensuring that the electrode end face is always in close contact with the surface of the recessed workpiece to complete the welding. The connecting wire of the welding electrode rod 8 is led outward through the through hole 18 on the sliding lifting handle 6, and the connecting flange 17 limits the sliding lifting handle 6 to prevent the sliding lifting handle 6 from coming out of the guide sleeve 5.

[0035] This solution utilizes buffer springs 9 with varying support strengths and inner liner springs 20 to form a graded elastic structure. The inner liner spring 20 deforms first to achieve small-amplitude convexity adaptation and small-stroke concave compensation. The buffer spring 9 only participates in the action after the inner liner spring 20 is fully compressed / extended, completing large-stroke floating compensation. This constructs a two-way, two-stage elastic avoidance structure for the welding electrode rod 8, adapting to a wide range of workpiece dimensional errors and ensuring tight contact between the electrode end face and the workpiece during multi-point welding. This is complemented by a mechanical linkage consisting of a large transmission gear 13, a small linkage gear 14, a large vertical rack 15, and a small vertical rack 16. The active fine-tuning mechanism passively raises the electrode when it protrudes and lowers it when it is concave, forming a two-way auxiliary fine-tuning mechanism to avoid the electrode hitting the workpiece hard and causing the base material to be welded through or the electrode to stick and be damaged. The sliding handle 6 is equipped with through holes 18 to neatly arrange the electrode leads. The connecting flange 17 limits the stroke of the sliding handle 6, and the inner spring 20 limits the radial displacement of the sliding adapter part 19, which effectively suppresses the radial deviation of the welding electrode rod 8 during the working process and reduces the probability of incomplete welding and missing welding in multi-point spot welding. The whole system relies on pure mechanical linkage to achieve adaptive adjustment without electrical control, and is suitable for gantry-type multi-welding rod synchronous welding operation scenarios.

[0036] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0037] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gantry-type spot welding machine, characterized in that, The assembly includes a horizontally arranged crossbeam plate (1) and at least two sets of welding rod assemblies (3) arranged along the horizontal direction of the crossbeam plate (1); the welding rod assembly (3) includes a welding electrode rod (8) and an elastic buffer assembly; the elastic buffer assembly is installed on the crossbeam plate (1) and connected to the welding electrode rod (8), and is used to drive the welding electrode rod (8) to float elastically in the vertical direction to adapt to the undulations of the surface of the welded part; It also includes a linkage fine-tuning mechanism; the linkage fine-tuning mechanism is connected between the welding electrode rod (8) of two adjacent sets of welding rod assemblies (3) and the elastic buffer assembly; when any welding electrode rod (8) moves upward excessively due to contact with the protrusion of the welded part, its upward movement is transmitted to the linkage fine-tuning mechanism through the elastic buffer assembly, and the linkage fine-tuning mechanism drives the adjacent welding electrode rod (8) to make additional fine movement in the same direction relative to its own elastic buffer assembly.

2. The gantry-type spot welding machine according to claim 1, characterized in that, The elastic buffer assembly includes: a guide sleeve (5) fixedly installed on the crossbeam plate (1), and a sliding handle (6) slidably disposed in the guide sleeve (5); the sliding handle (6) is elastically connected to the crossbeam plate (1) through a buffer spring (9); the welding electrode rod (8) is connected to the bottom of the sliding handle (6) through a mounting sleeve (7).

3. The gantry-type spot welding machine according to claim 2, characterized in that, One end of the sliding handle (6) passes through the top of the guide sleeve (5) and is provided with a connecting flange (17), the size of which is larger than the diameter of the guide sleeve (5).

4. The gantry-type spot welding machine according to claim 3, characterized in that, The buffer spring (9) is sleeved on the outside of the sliding handle (6), with its upper end abutting against the crossbeam plate (1) and its lower end abutting against the mounting sleeve (7).

5. The gantry-type spot welding machine according to claim 4, characterized in that, The assembly sleeve (7) has a sliding assembly cavity (10) inside; the top of the welding electrode rod (8) is provided with a sliding adapter (19), which is slidably assembled in the sliding assembly cavity (10) and can move relative to it in the vertical direction.

6. The gantry-type spot welding machine according to claim 5, characterized in that, The linkage fine-tuning mechanism includes a transmission gear set and a rack set that meshes with the transmission gear set; the rack set includes a vertical large rack (15) and a vertical small rack (16); the vertical large rack (15) is fixedly connected to the mounting sleeve (7), the mounting sleeve (7) has a guide groove (12) vertically opened on its side, a connecting rod (2) is connected to the sliding adapter (19), the connecting rod (2) passes through the guide groove (12) to reach the outside of the mounting sleeve (7), and the vertical small rack (16) is fixedly connected to the connecting rod (2); the transmission gear set is rotatably connected to the longitudinal connecting plate (4) between adjacent welding rod assemblies, and meshes with both the vertical large rack (15) and the vertical small rack (16) simultaneously. The transmission gear set includes a large transmission gear (13) and a small linkage gear (14) fixedly connected coaxially; the vertical large rack (15) meshes with the large transmission gear (13); the vertical small rack (16) meshes with the small linkage gear (14). When the bottom end of the welding electrode rod (8) contacts the workpiece protrusion, the mounting sleeve (7) moves upward and compresses the buffer spring (9). At the same time, the large transmission gear (13) and the small linkage gear (14) are driven to rotate clockwise by the vertical large rack (15). Then, the small linkage gear (14) drives the vertical small rack (16) to move the welding electrode rod (8) further upward relative to the mounting sleeve (7) to achieve adaptive fine adjustment and protection.

7. The gantry-type spot welding machine according to claim 6, characterized in that, The sliding handle (6) has a through hole (18) from one end of the connecting flange (17) to the other end. The through hole (18) communicates with the sliding assembly cavity (10). The terminal of the welding electrode rod (8) is located in the sliding assembly cavity (10) to output the electrical connection wire outward through the through hole (18).

8. The gantry-type spot welding machine according to claim 7, characterized in that, The welding electrode rod (8) is provided with a sliding adapter (19) at one end inside the sliding assembly cavity (10). The sliding adapter (19) is in close contact with the cavity wall of the sliding assembly cavity (10) to achieve sliding fit. The diameter of the sliding adapter (19) is larger than the diameter of the end of the welding electrode rod (8) inside the sliding assembly cavity (10). The sliding assembly cavity (10) is provided with an inner lining spring (20) sleeved around the welding electrode rod (8). The top end of the inner lining spring (20) is vertically upward abutting against the top of the sliding assembly cavity (10), and the bottom end is vertically downward abutting against the sliding adapter (19). The support strength of the inner lining spring (20) is greater than the support strength of the buffer spring (9).

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