Automatic square tube joint assembling and butt welding machine

Abstract

The utility model discloses a square tube joint automatic assembly bump welding machine, including the lifting stock bin for placing square tube, the manipulator for grabbing the square tube of lifting stock bin and placing in the material piece displacement mechanism's material inlet position, the welding station for transferring square tube to the welding mechanism to the material piece displacement mechanism for the finished product of welding well transfer loading, the joint conveying mechanism for conveying joint to the welding station of welding mechanism, the welding mechanism for welding to square tube and joint, realize square tube and joint feeding, assembly, welding and loading whole course automation, batch production processing, reduce processing cost and improve processing efficiency to big vice simultaneously, guarantee the unity of welding quality.

Description

Technical Field

[0001] This utility model relates to the field of pipe welding technology, and in particular to an automatic assembly and spot welding machine for square pipe joints. Background Technology

[0002] Square tubes and fittings, as the most basic connecting elements in the industrial field, can be combined through welding processes to form various complex and stable metal frame structures, such as... Figure 1 and 2 The welded components primarily serve the core functions of connecting extended square tubes, providing support, and transferring loads. Their advantages include quick and convenient assembly and disassembly, a stable structure after installation, and significantly reduced packaging volume after disassembly. They are widely used in numerous fields such as shelving units, table frames, guardrails, workbenches, and warehouse racks.

[0003] Currently, the assembly and welding of square tubes and fittings generally relies on manual or semi-automated welding methods. This process typically involves the following steps: operators manually fix the square tube onto a fixture, then place the fitting component at the designated welding position on the end of the square tube, and finally, a welder uses a welding torch to complete the welding. The welded workpiece is then manually collected into a container. Existing methods for assembling and welding square tubes and fittings require a large number of skilled welders, resulting in high costs, low efficiency, and an inability to meet the requirements of mass production. Furthermore, the welding quality depends heavily on the welder's experience and skill, making it difficult to guarantee consistent weld quality. Utility Model Content

[0004] To address the aforementioned issues, this utility model provides an automatic assembly and spot welding machine for square tube joints, enabling fully automated and mass production of square tubes and joints through feeding, welding, and loading. This significantly reduces processing costs and improves processing efficiency while ensuring consistent welding quality.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: an automatic assembly and spot welding machine for square tube joints, comprising:

[0006] The lifting hopper for placing square tubes includes a lifting platform, a fixed baffle and a movable baffle set on the surface of the lifting platform, a hopper for placing square tubes is formed between the fixed baffle and the movable baffle, and a first sensor for detecting whether a square tube is placed at a set position. The lifting platform is connected to a lifting drive component, which drives the lifting platform to lift so that the square tube corresponds to the set position of the first sensor.

[0007] A joint conveying mechanism used to convey joints to the welding station of a welding facility;

[0008] A material transfer mechanism for transferring square tubes to the welding station of a welding mechanism and loading the welded finished product includes a support frame, a material transfer mechanism, and a push-pull mechanism. The upper end of the support frame is provided with a first feeding groove, a first waiting groove for welding, a first welding groove, and a feeding ramp in sequence along its width direction. The first welding groove is aligned with the welding station of the welding mechanism. The material transfer mechanism is used to transfer the materials from the first feeding groove, the first waiting groove for welding, and the first welding groove to the adjacent station. The push-pull mechanism is located at one end of the support frame and is used to push the square tube from the welding groove to the welding station to secure the joint and pull out the welded finished product.

[0009] A robotic arm used to grab the square tubes from the lifting hopper and place them in the first feed trough;

[0010] A welding mechanism used for welding square tubes and joints.

[0011] Specifically, the lifting hopper also includes an adjusting seat, which is detachably connected to the surface of the lifting platform. An adjusting cylinder is fixedly installed on the adjusting seat, and the adjusting cylinder drives a moving baffle to move closer to or away from the fixed baffle.

[0012] Specifically, the lifting hopper also includes an alignment baffle. The alignment baffle is respectively disposed on the same side of the fixed baffle and the moving baffle and is connected to an alignment cylinder. The alignment cylinder drives the alignment baffle to move closer to or away from the width of the hopper.

[0013] Specifically, in the material transfer mechanism, the support frame includes two oppositely arranged fixed support plates, and a first feeding groove, a first welding groove, a first welding groove, and a feeding ramp are arranged sequentially along the width direction of the fixed support plates; the material transfer mechanism includes two movable support frames and a material transfer drive mechanism. The movable support frames are provided with a second feeding groove, a second welding groove, and a second welding groove corresponding to the first feeding groove, the first welding groove, and the first welding groove. The material transfer drive mechanism drives the two movable support frames to move horizontally along the width direction of the fixed support plates and to rise and fall vertically, transferring the materials in the first feeding groove, the first welding groove, and the first welding groove to the adjacent workstations.

[0014] Specifically, the push-pull mechanism includes: a fixed plate and a clamping cylinder and a push-pull cylinder mounted on the fixed plate. The piston rod of the clamping cylinder is connected to a clamping block. The fixed plate is provided with a positioning block opposite to the clamping block. The piston rod of the push-pull cylinder is fixed to the surface of the support frame. When the workpiece is located in the first welding groove, the clamping cylinder pushes the clamping block to clamp the workpiece between the clamping block and the positioning block. The push-pull action of the push-pull cylinder drives the workpiece to be pushed or pulled out towards the welding station.

[0015] Specifically, the material transfer drive mechanism includes: a mounting base, a lifting cylinder, a translation cylinder, and a drive shaft. The lifting cylinder is mounted on the mounting base and drives the movable bracket. The mounting base is respectively mounted on the surfaces of two fixed trays. A rack is connected to the bottom end of the mounting base. The drive shaft is connected to a gear corresponding to the rack. The gears of the drive shaft mesh with the racks at the bottom ends of the two mounting bases respectively. The translation cylinder is fixedly mounted on one of the fixed trays and drives the rack, driving the mounting base to translate along the width direction of the fixed tray.

[0016] Specifically, the robotic arm includes: a linear drive mechanism, a lifting cylinder, and an electromagnet. The linear drive mechanism is connected to the lifting cylinder and drives the lifting cylinder to move back and forth above the lifting hopper and the first feed trough. The piston rod of the lifting cylinder is connected to a mounting frame, and the electromagnet is fixed on the mounting frame for picking up or releasing the square tube. The lifting cylinder drives the electromagnet to move up and down. The mounting frame is also equipped with a second sensor for detecting the position of the electromagnet picking up the square tube.

[0017] Specifically, the joint conveying mechanism includes: a vibrating plate, a straight vibrating track connected to a straight vibrating feeder, a feeding position at the front end of the straight vibrating track, an output end of the vibrating plate connected to the feeding position, a feeding cylinder at the feeding position that pushes the joint towards the straight vibrating track, the end of the straight vibrating track being aligned with the welding position of the welding mechanism, and a pushing cylinder at the end of the straight vibrating track that pushes the joint located at the end of the straight vibrating track to the welding position of the welding mechanism.

[0018] Specifically, a limit cylinder is also provided at the material inlet position. The piston rod of the limit cylinder is connected to a limit plate, which pushes the limit plate between the linear vibration track and the material inlet position.

[0019] Specifically, the welding mechanism is characterized by the following features: the welding mechanism includes a transformer, a welding station, a first welding head, and a second welding head. The welding station is provided with a support platform. The first welding head is fixed on the surface of the support platform. When the joint is conveyed to the welding station, it is fitted onto the surface of the first welding head. When the square tube is pushed to the welding station, it is fitted onto the surface of the joint. There is a gap between the support platform and the first welding head. The second welding head is located on both sides and above the first welding head and is respectively connected to a welding cylinder. The welding cylinder pushes the second welding head to move along the direction of the first welding head. The current output terminal of the transformer is connected to the first welding head and the second welding head respectively.

[0020] The beneficial effects of this utility model are as follows: After the square tubes are stacked and placed in the lifting hopper, they are automatically picked up by a robotic arm and transferred to the material transfer mechanism. The joint conveying mechanism transfers the joints to the welding station of the welding mechanism. At the same time, the material transfer mechanism moves the square tubes to the welding station of the welding mechanism and fixes them on the joint surface. The welding mechanism welds the square tubes and joints together. Then, the material transfer mechanism loads the finished product. This realizes the fully automated and batch production of square tubes and joints, which greatly reduces processing costs and improves processing efficiency, while ensuring the uniformity of welding quality. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the square tube and the joint before welding.

[0022] Figure 2 This is a schematic diagram of the structure after the square tube and the joint are assembled and welded.

[0023] Figure 3 This is a schematic diagram of the structure of this utility model.

[0024] Figure 4 This is a structural diagram of the lifting silo.

[0025] Figure 5 yes Figure 4 Side view.

[0026] Figure 6 This is a schematic diagram of the material shifting mechanism.

[0027] Figure 7 yes Figure 6 Enlarged view of point A in the middle.

[0028] Figure 8 This is a schematic diagram of the robotic arm.

[0029] Figure 9 This is a schematic diagram of the joint feeding mechanism.

[0030] Figure 10 This is a schematic diagram of the welding mechanism.

[0031] Figure 11 This is a front view of the welding mechanism.

[0032] Figure 12 yes Figure 10 Enlarged view of point B in the middle. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings.

[0034] Please see Figure 3 This embodiment discloses an automatic assembly and spot welding machine for square tube joints, including a lifting hopper 1, a material shifting mechanism 2, a robotic arm 3, a joint conveying mechanism 4, and a welding mechanism 5, which are mounted on a frame 100.

[0035] Square tubes are stacked in the lifting hopper 1. The robotic arm 3 automatically picks them up and transfers them to the material transfer mechanism 2. The joint conveying mechanism 4 transfers the joints to the welding station of the welding mechanism 5. At the same time, the material transfer mechanism 2 moves the square tubes to the welding station of the welding mechanism 5 and fixes them on the joint surface. The welding mechanism 5 welds the square tubes and joints at the overlapping position. Then, the material transfer mechanism 5 sends the finished product out for loading. This realizes the fully automated and batch production of square tubes and joints, which greatly reduces processing costs and improves processing efficiency, while ensuring the uniformity of welding quality.

[0036] Please see Figure 4-5 The lifting hopper 1 includes a lifting platform 11, a fixed baffle 111 and a movable baffle 112 disposed on the surface of the lifting platform 11, forming a hopper for placing square tubes between the fixed baffle 11 and the movable baffle 112, and a first sensor 12 for detecting whether a square tube is placed at a set position. The lifting platform 11 is connected to a lifting drive component, which drives the lifting platform 11 to lift so that the square tube corresponds to the set position of the first sensor 12.

[0037] In a preferred embodiment, an adjusting seat 113 is also included. The adjusting seat 113 is detachably connected to the surface of the lifting platform 11. Specifically, the surface of the lifting platform 11 is provided with a slot 114 along the length direction. The adjusting seat 113 is adjusted to the position according to different square tube lengths and fixed to the slot 114 by screws or other connecting parts. An adjusting cylinder 115 is fixedly provided on the adjusting seat 113. The adjusting cylinder 115 drives the connected moving baffle 112. The piston rod of the adjusting cylinder 115 pushes or locks, causing the moving baffle 112 to move closer to or away from the fixed baffle 111.

[0038] As a preferred embodiment, it also includes an alignment baffle 116, which is respectively disposed on the same side of the fixed baffle 111 and the movable baffle 112 and connected to an alignment cylinder 117. The alignment cylinder drives the alignment baffle 116 to move closer to or away from the width of the hopper.

[0039] When the worker places square tubes into the hopper, the adjusting cylinder 115 drives the moving baffle 112 away from the fixed baffle 111, and the alignment cylinder 117 drives the alignment baffle 116 away from the hopper, which increases the loading length and width of the hopper, making it easier for the worker to place the square tubes. After the square tubes are placed, the adjusting cylinder 115 drives the moving baffle 112 closer to the fixed baffle 111, and the alignment cylinder 117 drives the alignment baffle 116 closer to the hopper, shrinking in both the length and width directions of the hopper so that all the square tubes placed on the hopper are flattened, making it easier for the robot arm 3 to pick up the material later.

[0040] The first sensor 12 is located at the upper end of one side of the hopper, sensing the square tubes placed on the top layer. After the robotic arm 3 has picked up all the square tubes on the top layer, when the first sensor 12 can no longer sense any square tubes, the lifting drive drives the lifting platform 11 to rise, causing the first sensor 12 to sense the top layer of square tubes again. At this time, the lifting drive stops lifting, waiting for the robotic arm 3 to continue picking up materials. This cycle continues until all the square tubes in the hopper have been picked up, and then the lifting drive drives the lifting platform 11 to descend to the lowest point. In this embodiment, the first sensor 12 is a photoelectric sensor, which is fixed by the support frame 121.

[0041] Please see Figure 5 In this embodiment, the lifting drive includes a drive motor 13 and two lead screw lifting machines 14. The drive motor 13 and the two lead screw lifting machines 14 are fixed on the support plate 15. The support plate 15 is fixed to the lower end of the lifting platform 11 by the cooperation of the guide rod 151 and the linear bearing 152.

[0042] The input shafts of the two lead screw lifting machines 14 are connected to the connecting shaft 142 via a coupling 141. The drive motor 13 is connected to the input shaft of one of the lead screw lifting machines 14. The lead screws 143 of the two lead screw lifting machines 14 are fixedly connected to the bottom end of the lifting platform 11. The drive motor 13 drives the lead screws of the two lead screw lifting machines 14 to rise and fall by reversing forward and reverse, thereby driving the lifting platform 11 to rise and fall.

[0043] Please see Figure 6 The material transfer mechanism 2 includes a support frame, a material transfer mechanism, and a push-pull mechanism.

[0044] The support frame includes two opposing fixed support plates 21. The top of the fixed support plates 21 is provided with a first feeding groove 211, a first welding groove 212, a first welding groove 213 and a feeding ramp 214 in sequence along the width direction. The robot arm 3 grabs the square tube from the lifting bin 1 and places the two ends of the square tube on the two first feeding grooves 211 respectively. The first welding groove 212 is used to place the square tube from the first feeding groove 211. The first welding groove 213 is aligned with the welding station of the welding mechanism 5 and is used to place the square tube from the first welding groove 212. It is pushed to the welding station of the welding mechanism 5 by a push-pull mechanism to fix the joint. After the welding mechanism 5 completes the welding, it is pulled out. The feeding ramp 214 is used to send out the welded finished product to complete the loading.

[0045] As a preferred implementation, two positioning bearings 215 are provided outside the welding station near the welding mechanism 5 in the first welding groove 211. When the square tube is pushed into the welding station by the push-pull mechanism, it passes through the two positioning bearings 215 and is positioned by the two positioning bearings 215 to ensure that it can accurately enter the welding station to secure the joint and ensure the quality of the welding.

[0046] In a preferred embodiment, an adjusting screw 216 is also included for adjusting the distance between the two fixed support plates 21. The nut 217 of the adjusting screw 216 is fixedly connected to one of the fixed support plates 21. An adjusting handwheel 218 is provided at the end of the adjusting screw 216. By rotating the adjusting handwheel 218, the adjusting screw 216 is driven to rotate, thereby causing the fixed support plate 21 to move closer to or further away from the other fixed support plate 21 through the nut 217, changing the distance between the two fixed support plates 21 to accommodate square tubes of different lengths.

[0047] In this embodiment, the transfer of materials on the first feeding groove 211, the first welding groove 212, and the first welding groove 213 is completed by a single drive of the material transfer mechanism. That is, the material transfer mechanism transfers the materials on the first feeding groove 211, the first welding groove 212, and the first welding groove 213 to the adjacent workstation in a single operation.

[0048] The material transfer mechanism includes two movable brackets 22 and a material transfer drive mechanism. The movable brackets 22 are provided with a second inlet groove 221, a second weld groove 222, and a second weld groove 223 corresponding to the first inlet groove 211, the first weld groove 212, and the first weld groove 213. The material transfer drive mechanism drives the two movable brackets 22 to move horizontally along the width direction of the fixed support plate 21 and to rise and fall vertically, transferring the materials in the first inlet groove 211, the first weld groove 212, and the first weld groove 213 to the adjacent workstations.

[0049] The operation process of the material shifting mechanism is as follows:

[0050] a. The movable bracket 22 is driven to translate by the material transfer drive mechanism, so that the second feed groove 221, the second weldable groove 222 and the second welding groove 223 are located below the first feed groove 211, the first weldable groove 212 and the first welding groove 213 and are aligned in the vertical direction;

[0051] b. The movable bracket 22 is driven to move vertically upward by the material transfer drive mechanism, lifting the material on the first feeding groove 211, the first welding groove 212 and the first welding groove 213, and transferring the material to the second feeding groove 221, the second welding groove 222 and the second welding groove 223.

[0052] c. The movable bracket 22 is driven to translate by the material transfer drive mechanism so that the second feed groove 221, the second weldable groove 222 and the second welding groove 223 are located above the first weldable groove 212, the first welding groove 213 and the feeding ramp 214 and are aligned in the vertical direction.

[0053] d. The moving bracket 22 is driven to move vertically downward by the material transfer drive mechanism, placing the materials in the second feeding groove 221, the second welding groove 222 and the second welding groove 223 on the first welding groove 212, the first welding groove 213 and the feeding ramp 214, so as to realize the transfer of materials and the finished product being sent out from the feeding ramp 214.

[0054] In this embodiment, the material transfer drive mechanism includes a mounting base 224, a lifting cylinder (obscured by the mounting base 224 and not shown in the figure), a translation cylinder 226, and a drive shaft 227. The lifting cylinder is mounted on the mounting base 224 and drives the connected movable bracket 22. The mounting base 224 is respectively mounted on the surfaces of two fixed brackets 21. A rack 228 is connected to the bottom end of the mounting base 224. The drive shaft 227 is connected to a gear 229 corresponding to the rack 228. The gear 229 of the drive shaft 227 meshes with the rack 228 at the bottom ends of the two mounting bases 224 for transmission. The translation cylinder 226... 26 is fixedly mounted on one of the fixed support plates 21 and driven by the rack 228. The drive mounting base 224 is translated along the width direction of the fixed support plate 21. That is, the translation cylinder 226 pushes the rack 228 to drive the mounting base 224 and the lifting cylinder to translate along the width direction of the fixed support plate 21. Since the rack 228 meshes with the gear 229 of the transmission shaft 227, the transmission gear 229 rotates during the movement of one rack 228, driving the other gear 229 to rotate, thereby driving the rack 228 of the other mounting base 224 to achieve synchronous translation of the two moving brackets 22.

[0055] Please see Figure 7 In this embodiment, the push-pull mechanism includes: a fixed plate 231 and a clamping cylinder 232 and a push-pull cylinder 233 disposed on the fixed plate 231. The piston rod of the clamping cylinder 232 is connected to a clamping block 234. The fixed plate 231 is provided with a positioning block 235 opposite to the clamping block 234. The piston rod of the push-pull cylinder 233 is fixed to the surface of a certain bracket 21 in the support frame. When the square tube is transferred to the first welding groove 213, the clamping cylinder 232 pushes the clamping block 234 to clamp the square tube between the clamping block 234 and the positioning block 235. Then, the push-pull cylinder 233 pushes the square tube to the welding station of the welding mechanism 5 to fix the joint. After the welding is completed, the push-pull cylinder 233 pulls the finished product out of the welding station. Then, the clamping cylinder 232 retracts the clamping block 324. At this time, the finished product is waiting to be transferred to the feeding ramp 214 for feeding.

[0056] Please see Figure 8 In this embodiment, the robotic arm 3 includes: a linear drive mechanism 31, a lifting cylinder 32, and an electromagnet 33; wherein the linear drive mechanism 31 is a commonly used mechanism in the field of automation, using a servo motor 311 or a stepper motor 311 as the drive, which is converted into linear motion through a synchronous pulley 312 and a synchronous belt 313, and a slide table 314 is provided connected to the synchronous belt 313, which drives the slide table 314 to perform linear motion. The slide table 314 is fixed by connecting a slider 315 and a guide rail 316.

[0057] The linear drive mechanism 31 has a slide 314 fixedly connected to a bracket 317. The lifting cylinder 32 is fixedly mounted on the bracket 317, thereby driving the lifting cylinder 31 to reciprocate above the lifting hopper 1 and the first feed trough 211. The piston rod of the lifting cylinder 32 is connected to a mounting bracket 321. The electromagnet 33 is fixed on the mounting bracket 321 and is used to pick up or release the square tube. The lifting cylinder 32 drives the electromagnet 33 to lift up and down. The mounting bracket 321 is also equipped with a second sensor 34 for detecting the position of the electromagnet 33 picking up the square tube. In this embodiment, the second sensor 34 is also a photoelectric sensor.

[0058] The robotic arm's movement process is as follows:

[0059] a. The lifting cylinder 32 drives the mounting bracket 321 to move downward, so that the electromagnet 33 is aligned with the position of the uppermost square tube in the lifting bin 1;

[0060] b. The linear drive mechanism 31 drives the lifting cylinder 32 to move towards the uppermost square tube in the lifting bin 1;

[0061] c. When the mounting bracket 321 moves, the second sensor 34 senses the nearest square tube on the top layer, and the linear drive mechanism 31 stops driving.

[0062] d. When the electromagnet 33 is energized, it attracts the square tube. The lifting cylinder 32 drives the mounting frame 321 to move upward, and at the same time the linear drive mechanism 3 drives the mounting frame 321 to move above the first feed trough 211.

[0063] e. When the square tube is above the first feed trough 211, the linear drive mechanism 31 stops driving, the lifting cylinder 32 drives the mounting bracket 321 to move downward to place the square tube in the first feed trough 211, then the electromagnet 33 is de-energized to release the adsorption of the square tube, and finally the lifting cylinder 32 is reset to complete one round of material removal of the square tube.

[0064] Please see Figure 9 In this embodiment, the joint conveying mechanism 4 includes: a vibrating plate (not shown in the attached drawings), a straight vibrating track 42 connected to a straight vibrating feeder 41, a feeding position at the front end of the straight vibrating track 42, a conveying track (not shown in the attached drawings) connected to the vibrating plate, the conveying track connected to the feeding position of the straight vibrating track 42, a feeding cylinder 43 at the feeding position that pushes the joint towards the straight vibrating track 42, the end of the straight vibrating track 42 aligned with the welding position of the welding mechanism 5, and a pushing cylinder 44 at the end of the straight vibrating track 42 that pushes the joint located at the end of the straight vibrating track 42 to the welding position of the welding mechanism 5.

[0065] The joint is driven by the vibrating plate and enters the feeding position of the straight vibration track 42 through the conveying track. Then, the feeding cylinder 43 pushes the joint into the straight vibration track 42. Through the vibration of the straight vibration feeder 41, the joint is conveyed to the end of the straight vibration track 42. When the joint reaches the end of the straight vibration track 42, the pushing cylinder 44 pushes the joint into the welding position of the welding mechanism 5, waiting for welding processing.

[0066] In a preferred embodiment, a limiting cylinder 45 is also provided at the feeding position. The piston rod of the limiting cylinder 45 is connected to a limiting plate 451. The limiting cylinder 45 pushes the limiting plate 451 between the vertical vibration track 42 and the feeding position. When the vibrating plate transports the connector to the feeding position, the limiting cylinder 45 drives the limiting plate 451 to block between the vertical vibration track 42 and the feeding position. When the connector is fully inserted into the feeding position, the limiting cylinder 45 retracts the limiting plate 451, and then the feeding cylinder 43 pushes the connector into the vertical vibration track 42. This prevents the connector from being pushed into the vertical vibration track 42 by the feeding cylinder 43 before it is fully inserted into the feeding position, thus avoiding jamming.

[0067] Please see Figure 10-11 In this embodiment, the welding mechanism 5 includes a transformer 51, a welding station, a first welding head 53, and a second welding head 54.

[0068] The welding station is equipped with a support platform 521. The first welding head 53 is fixed on the surface of the support platform 521. When the joint is pushed to the welding station by the pusher cylinder 44 in the joint conveying mechanism 4, it is fixed to the surface of the first welding head 53. Specifically, in the joint conveying mechanism 4, the end of the linear vibration track 42 is aligned with the first welding head 53. The pusher cylinder 44 pushes the joint located at the end of the linear vibration track 42 towards the first welding head 53 and finally fixes it to the surface of the first welding head 53 (e.g., ...). Figure 9 (As shown).

[0069] Correspondingly, the square tube is placed in the first welding groove 213 before being pushed to the welding station. The first welding groove 213 is aligned with the first welding head 53 in the welding station. The push-pull mechanism pushes the square tube toward the first welding head 53 and finally secures it to the joint surface, waiting for subsequent welding.

[0070] The second welding head 54 is located on both sides and above the first welding head 53, specifically on both sides and above the connection between the square tube and the joint; each second welding head 54 is connected to a welding cylinder 55, which pushes the second welding head 54 to move along the direction of the first welding head 53 and finally come into contact with it.

[0071] The current output terminal of transformer 51 is connected to the first welding head 53 and the second welding head 54 respectively. Specifically, one current output terminal of transformer 51 is connected to the first welding head 53 through a copper plate 56; the three second welding heads 54 are also connected to copper plates 56 respectively, and the ends of the three copper plates 56 are stacked and connected to the other output terminal of transformer 51 (e.g., ...). Figure 10 ).

[0072] As a preferred embodiment, to facilitate accurate fitting of the square tube onto the joint surface, a gap 522 is provided between the support platform 521 and the first welding head 53 (e.g., ...). Figure 12 As the square tube is pushed in, it is guided along the gap 522 to secure it to the joint surface.

[0073] In this embodiment, the welding station, the first welding head 53, the second welding head 54 and the welding cylinder 55 are all fixedly installed in the welding head fixing plate 57, and fixedly installed on the frame 100 by the welding head fixing plate 56.

[0074] The working process of welding mechanism 5 is as follows:

[0075] a. When both the joint and the square tube are conveyed to the welding station and the square tube is fixed on the surface of the joint, the welding cylinder 55 drives the second welding head 54 located above the first welding head 53 to move down and press against the surface of the square tube. The transformer 51 is energized and works to weld the upper end of the square tube. After the energization reaches the set time, the power is cut off, and then the welding cylinder 55 drives the second welding head 54 to rise and reset.

[0076] b. The welding cylinder 55 drives the second welding heads 54 located on both sides of the first welding head 53 to press against the surface of the square tube. The transformer 51 is energized and works to weld both sides of the square tube. After the energization reaches the set time, the power is cut off. Then the welding cylinder 55 drives the second welding heads 54 on both sides to reset, completing the welding.

[0077] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An automatic assembly and spot welding machine for square tube joints, characterized in that, include: Lifting hopper; including: lifting platform, fixed baffle and movable baffle set on the surface of lifting platform, forming a hopper for placing square tube between the fixed baffle and movable baffle, and a first sensor for detecting whether a square tube is placed at a set position, the lifting platform is connected to a lifting drive component, driving the lifting platform to lift so that the square tube corresponds to the set position of the first sensor. A joint conveying mechanism is used to convey joints to the welding station of the welding mechanism; The material transfer mechanism includes: a support frame, a material transfer mechanism, and a push-pull mechanism. The upper end of the support frame is provided with a first feeding groove, a first welding groove, a first welding groove, and a feeding ramp in sequence along its width direction. The first welding groove is aligned with the welding station of the welding mechanism. The material transfer mechanism is used to transfer the materials in the first feeding groove, the first welding groove, and the first welding groove to the adjacent station. The push-pull mechanism is set at one end of the support frame and is used to push the square tube of the welding groove to the welding station to fix the joint and pull out the welded finished product. A robotic arm is used to grab the square tubes from the lifting hopper and place them on the first feed chute of the material transfer mechanism; Welding equipment is used to weld square tubes and joints.

2. The automatic assembly and spot welding machine for square tube joints according to claim 1, characterized in that: The lifting hopper also includes an adjustment seat, which is detachably connected to the surface of the lifting platform. An adjustment cylinder is fixedly installed on the adjustment seat, and the adjustment cylinder drives the moving baffle to move closer to or away from the fixed baffle.

3. The automatic assembly and spot welding machine for square tube joints according to claim 2, characterized in that: The lifting hopper also includes an alignment baffle. The alignment baffle is respectively set on the same side of the fixed baffle and the moving baffle and is connected to an alignment cylinder. The alignment cylinder drives the alignment baffle to move closer to or away from the width of the hopper.

4. The automatic assembly and spot welding machine for square tube joints according to claim 1, characterized in that: In the material transfer mechanism, the support frame includes two oppositely arranged fixed support plates, wherein the first feeding groove, the first welding groove, the first welding groove, and the feeding ramp are arranged sequentially along the width direction of the upper end of the fixed support plate; the material transfer mechanism includes two movable support frames and a material transfer drive mechanism. The movable support frames are provided with a second feeding groove, a second welding groove, and a second welding groove corresponding to the first feeding groove, the first welding groove, and the first welding groove. The material transfer drive mechanism drives the two movable support frames to move horizontally along the width direction of the fixed support plate and to rise and fall vertically, transferring the materials in the first feeding groove, the first welding groove, and the first welding groove to the adjacent workstation.

5. The automatic assembly and spot welding machine for square tube joints according to claim 4, characterized in that: The push-pull mechanism includes: a fixed plate and a clamping cylinder and a push-pull cylinder mounted on the fixed plate. The piston rod of the clamping cylinder is connected to a clamping block. The fixed plate is provided with a positioning block opposite to the clamping block. The piston rod of the push-pull cylinder is fixed to the surface of the support frame. When the workpiece is located in the first welding groove, the clamping cylinder pushes the clamping block to clamp the workpiece between the clamping block and the positioning block. The push-pull action of the push-pull cylinder drives the workpiece to be pushed or pulled out towards the welding station.

6. The automatic assembly and spot welding machine for square tube joints according to claim 4, characterized in that: The material transfer drive mechanism includes: a mounting base, a lifting cylinder, a translation cylinder, and a drive shaft. The lifting cylinder is mounted on the mounting base and drives the movable bracket. The mounting base is respectively mounted on the surfaces of two fixed trays. A rack is connected to the bottom end of the mounting base. The drive shaft is connected to a gear corresponding to the rack. The gears of the drive shaft mesh with the rack at the bottom end of the mounting base. The translation cylinder is fixedly mounted on one of the fixed trays and drives the rack, driving the mounting base to translate along the width direction of the fixed tray.

7. The automatic assembly and spot welding machine for square tube joints according to claim 1, characterized in that: Robotic arms include: The linear drive mechanism, lifting cylinder, and electromagnet are connected. The linear drive mechanism drives the lifting cylinder to move back and forth above the lifting hopper and the first feed trough. The piston rod of the lifting cylinder is connected to a mounting frame. The electromagnet is fixed on the mounting frame and is used to pick up or release the square tube. The lifting cylinder drives the electromagnet to lift and lower. The mounting frame is also equipped with a second sensor for detecting the position of the electromagnet picking up the square tube.

8. The automatic assembly and spot welding machine for square tube joints according to claim 1, characterized in that: The joint conveying mechanism includes: a vibratory plate, a linear vibratory track connected to a linear vibratory feeder, a joint inlet position at the front end of the linear vibratory track, an output end of the vibratory plate connected to the joint inlet position, a feeding cylinder at the inlet position that pushes the joint towards the linear vibratory track, an end of the linear vibratory track aligned with the welding station of the welding mechanism, and a pushing cylinder at the end of the linear vibratory track that pushes the joint located at the end of the linear vibratory track to the welding station of the welding mechanism.

9. The automatic assembly and spot welding machine for square tube joints according to claim 8, characterized in that: A limit cylinder is also provided at the material inlet. The piston rod of the limit cylinder is connected to a limit plate, which pushes the limit plate between the linear vibration track and the material inlet.

10. The automatic assembly and spot welding machine for square tube joints according to any one of claims 1-9, characterized in that: The welding mechanism includes a transformer, a welding station, a first welding head, and a second welding head. The welding station is equipped with a support platform. The first welding head is fixed on the surface of the support platform. When the joint is conveyed to the welding station, it is fitted onto the surface of the first welding head. There is a gap between the support platform and the first welding head. When the square tube is pushed to the welding station, it is fitted onto the surface of the joint. The second welding head is located on both sides and above the first welding head and is connected to welding cylinders respectively. The welding cylinders push the second welding head to move along the direction of the first welding head. The current output terminal of the transformer is connected to the first welding head and the second welding head respectively.

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