Oil tank seam welding machine head

Abstract

The utility model relates to an oil tank seam welding machine head which is provided with a machine frame. The oil tank seam welding machine head comprises an upper welding wheel device and a lower welding wheel device, and the welding wheel devices are respectively connected with a rotary driving device; the welding wheel device located on the upper portion and the rotation driving device of the welding wheel device are fixed to the upper portion of the rack. The welding wheel device located on the lower portion and the rotation driving device of the welding wheel device are installed on a lifting platform of the lifting driving device. The lifting driving device drives the welding wheel device on the lower portion to vertically ascend and descend relative to the welding wheel device on the upper portion. Trimming devices are mounted on the edges of the upper welding wheel device and the lower welding wheel device respectively; a transformer is fixed on the rack, and the positive electrode and the negative electrode of the transformer are connected with the upper welding wheel device and the lower welding wheel device through conductive copper plates respectively. The oil tank seam welding robot is more integrated in structure, reasonable in overall weight and capable of being installed at the tail end of a mechanical arm of the robot to form the oil tank seam welding robot, an automatic oil tank seam welding system is further formed, automatic seam welding is conducted on an oil tank, and welding efficiency can be greatly improved.

Description

Technical Field

[0001] The utility model relates to a welding head for seam welding the edges of a fuel tank, belonging to the field of welding equipment. Background Art

[0002] The outer shape of a fuel tank is generally complex. It requires two upper and lower steel plates to be respectively stamped and formed, and then combined together. A special welding machine is used to perform seam welding on the edges of the upper and lower steel plates to achieve a tight and reliable connection and ensure no leakage.

[0003] The automatic weld seam machine for the fuel tank shell with the Chinese patent publication number CN217551409U discloses a device for automatically welding a fuel tank. Taking the welding machine as the main body, the fuel tank is then erected on a rotating / moving workbench, and the edge seams of the fuel tank are continuously conveyed between the upper and lower welding rollers for roll welding. However, in this device, the welding roller area is fixed, and it is necessary to precisely design the movement trajectory of the fuel tank to match the welding operation requirements, and the setting difficulty is relatively large; when switching products, the adjustment is relatively difficult, and after welding is completed, it is necessary to re-clamp to continue the welding operation, and the waiting time is relatively long.

[0004] For fuel tank products, there are also special seam welding robots. As shown in the seam welding robot with the Chinese patent publication number CN103658954A, a seam welding head is installed at the end of an industrial multi-axis robotic arm, and then seam welding operations are performed on the edge seams of products such as fuel tanks. The robotic arm drives the seam welding head to move around the fuel tank for one week to complete the welding.

[0005] However, limited by the load requirements of the industrial robotic arm, the seam welding head needs to be made lighter. As a result, in a conventional design, many components need to be installed away from the head, which leads to situations such as control delay and even inaccurate control; thus, the application effect is relatively poor.

[0006] In view of the above situation, it is necessary to re-design the seam welding head according to the application requirements of the seam welding robot, that is, to meet the load requirements of the robot and the high-quality requirements of seam welding, with short control delay and more precise control. Summary of the Utility Model

[0007] The purpose of the present utility model is to provide a fuel tank seam welding head, which realizes seam welding operation through two upper and lower welding wheel devices; makes the rotation of the welding wheel more precise through a rotation driving device; enables the upper and lower rollers to always press the edge seam during welding through a lifting driving device, providing welding pressure for the edge seam; trims the rollers through a trimming device to improve welding quality; increases the current of the rollers by directly arranging a transformer on the frame, improving welding efficiency and welding quality; shortens the distance of the gas-liquid pipeline by directly arranging a gas-liquid distribution and adjustment device on the frame, making the control response faster and the control more precise; and makes the entire fuel tank seam welding head lightweight through reasonable design and layout, and can be stably installed at the end of the robotic arm of a robot to perform reliable seam welding operation on the fuel tank.

[0008] To achieve the above utility model purpose, the present utility model provides a fuel tank seam welding head, which is provided with a frame, and each component is installed on the frame;

[0009] The fuel tank seam welding head includes two upper and lower welding wheel devices, and the welding wheel devices are respectively connected to a rotation driving device;

[0010] Among them, the upper welding wheel device and its rotation driving device are fixed on the upper part of the frame; the lower welding wheel device and its rotation driving device are installed on the lifting platform of the lifting driving device; the lifting driving device drives the lower welding wheel device to perform vertical lifting movement relative to the upper welding wheel device;

[0011] Trimming devices are respectively installed on the edges of the two upper and lower welding wheel devices;

[0012] A transformer is fixed on the frame, and the positive and negative electrodes of the transformer are respectively connected to the two upper and lower welding wheel devices through conductive copper plates;

[0013] The welding wheel device is provided with a rotatable roller; the roller is respectively electrically connected to the positive and negative electrodes of the transformer;

[0014] A gas-liquid distribution and adjustment device is fixed on the frame, and the gas-liquid distribution and adjustment device is connected to a gas-using or cooling water-using device through a pipeline;

[0015] Cables, air pipes, and circulating cooling water pipes are gathered together and arranged along the robotic arm of the robot.

[0016] As a further improvement of the present utility model, a connecting frame for connecting and fixing with a robot is provided at the top of the frame;

[0017] An installation frame is provided on one side of the connecting frame, and the gathered pipelines are fixed on the installation frame.

[0018] As a further improvement of the present utility model, the welding wheel device includes a roller, a main shaft, a conductive box, and a rotation driving wheel;

[0019] The roller is fixedly mounted on the end of the main shaft;

[0020] The main shaft is rotatably mounted in the conductive box, and a rotating driving wheel is fixedly mounted on the main shaft; the rotating driving wheel is located between the roller and the conductive box;

[0021] A rotating conductive device is arranged in the conductive box; and the outer surface of the conductive box is electrically connected to one pole of the transformer.

[0022] Furthermore, the conductive box has a water-cooling chamber inside and a water-cooling joint on the conductive box, which is connected to a circulating cooling water pipe.

[0023] Furthermore, a roller cooling box is provided at the tail of the conductive box;

[0024] The main shaft is a hollow shaft with a cooling water chamber inside, which is connected to the roller;

[0025] A water cooling joint is provided on the outside of the roller cooling box, which is connected to the circulating cooling water pipe;

[0026] The cooling water chamber in the roller cooling box is communicated with the cooling water chamber of the main shaft.

[0027] Further, the rotation drive device includes a drive motor, a motor drive wheel, and a drive belt;

[0028] The driving motor is a servo motor;

[0029] The output shaft end of the driving motor is equipped with a motor driving wheel;

[0030] The motor drive wheel and the rotating drive wheel are both synchronous pulleys;

[0031] The motor driving wheel and the rotating driving wheel are connected via a driving belt.

[0032] As a further improvement of the utility model, the lifting drive device includes a lifting cylinder, the cylinder body of the lifting cylinder is fixed on the frame, and the end of the piston rod of the lifting cylinder is installed with a lifting platform;

[0033] The welding wheel device located below is directly fixed on the lifting platform;

[0034] The rotating drive device bracket located below is connected and fixed on the lifting platform.

[0035] Furthermore, a guide device is provided between the lifting platform and the side wall of the frame;

[0036] The guide device includes 4 pairs of lifting linear slide blocks and lifting linear slide rails;

[0037] The lifting linear slider is fixed on the lifting platform through an adapter bracket;

[0038] The lifting linear slide rail is vertically fixed on the inner side of the side wall of the frame;

[0039] The lifting linear slider is matched with the lifting linear slide rail.

[0040] Furthermore, the guiding device is a stainless steel guiding device.

[0041] As a further improvement of the present utility model, the trimming device installed beside the upper welding wheel device is a horizontally arranged trimming device; the trimming device installed beside the lower welding wheel device is a vertically arranged trimming device;

[0042] The trimming device includes a trimming blade, a tool holder, a trimming cylinder, and a trimming linear guiding device;

[0043] The trimming blade has a blade shape that matches the outer surface shape of the roller;

[0044] The trimming blade is fixedly installed in the tool holder and exposes the blade;

[0045] The tool holder is installed at the end of the output piston rod of the trimming cylinder, and the trimming cylinder drives the tool holder and the trimming blade to move, approaching or moving away from the roller;

[0046] A trimming linear guiding device is provided between the tool holder and the fixed bracket of the trimming device, including a trimming linear slider fixed to the tool holder and a trimming linear slide rail connected to the fixed bracket. The trimming linear slider is matched with the trimming linear slide rail.

[0047] Furthermore, a dust collecting hopper is provided on the tool holder. The dust collecting opening of the dust collecting hopper is arranged close to the trimming blade and is located below the blade.

[0048] As a further improvement of the present utility model, one pole of the transformer is connected to the conductive box of the lower welding wheel device through a first conductive copper plate;

[0049] A conductive flexible connection is provided between the first conductive copper plate and the conductive box;

[0050] The other pole of the transformer is directly connected to the conductive box of the upper welding wheel device through a second conductive copper plate.

[0051] Furthermore, cooling water channels are provided in the first conductive copper plate and the second conductive copper plate;

[0052] The cooling water channels are connected to the circulating cooling water pipe through water cooling connectors.

[0053] The fuel tank seam welding head of the present utility model has a more integrated structure and a reasonable overall weight, and can be installed at the end of the robotic arm. As the robotic arm moves around the fuel tank, the rollers of the welding wheel device clamp the edge of the fuel tank, and a large current is passed through for welding. During the process, the robotic arm drives the fuel tank seam welding head to move along the edge of the fuel tank, while the rotary drive device drives the rollers to roll, so that the rollers press tightly against the edge of the fuel tank and roll along the edge of the fuel tank, minimizing sliding friction, which can cause the rollers to be damaged too quickly and also prevent poor surface quality of the welding due to sliding.

[0054] The fuel tank seam welding head of the present utility model trims the rollers through a trimming device. During the trimming process, the trimming cylinder drives the blade edge to abut against the surface of the roller, and the rotary drive device drives the roller to rotate, thereby using the relative movement between the blade edge and the roller to trim the roller. By adjusting the pressure of the compressed air in the trimming cylinder, the cutting force of the blade edge can be adjusted, and thus the trimming amount of the roller surface can be adjusted. During the welding operation, a relatively small air pressure can be introduced into the trimming cylinder of the trimming device, so that the blade edge always abuts against the surface of the roller, and the ash and chips adhered to the surface of the roller during the welding process can be cleaned in a timely manner, preventing them from sticking to the surface of the roller, which can affect both the welding quality and the roller. Using a relatively small air pressure also ensures that the blade edge does not cut the roller during this process, causing its diameter to decrease.

[0055] Generally speaking, the fuel tank seam welding head of the present utility model has the following characteristics:

[0056] 1. The entire welded square box is silver-plated, with good electrical conductivity, high reliability for long-term operation, and stable welding current;

[0057] 2. The follow-up tool trimming mechanism is more flexible and convenient. It can weld the follow-up trimming mold rollers according to the user's process requirements; or trim the mold after welding a certain number; or fix it to a certain position for trimming; the trimming time is short and the electrode consumption is low;

[0058] 3. The conductive copper plate connecting the transformer is water-cooled; and due to the close distance between the transformer and the welding wheel device, the cross-sectional area of the conductive copper plate can be increased, and the surface can be silver-plated to make the electrical conductivity better;

[0059] 4. Stainless steel double sliders are used on both sides of the lifting platform, providing more stable and durable two-way guidance;

[0060] 5. The lifting cylinder of the lifting drive device is controlled by a proportional valve and is integrated beside the cylinder, making the air pressure more stable during the welding process, and thus the pressure between the upper and lower two rollers is also more stable;

[0061] 6. The frame (overall framework) and auxiliary devices such as connecting brackets are made of 7075 aluminum alloy, making the overall structure lightweight;

[0062] 7. Cooling water system, air pipe, pipeline optimization; a distribution device is adopted to make the water and air pipelines clear and easy to inspect and troubleshoot; and when installing, avoid heat-generating parts to ensure no risk of scalding for the water and air pipelines.

[0063] 8. The drive motor of the rotary drive device and the control electrical appliances of other cylinder connection valves adopt module integration, directly communicate with the PLC, which is fast and has strong anti-interference; the electrical control adopts the master-slave mode, and the pipeline package cables are streamlined, thus eliminating problems such as abnormal communication caused by wear, pulling, etc.

[0064] 9. The development port of the control system can be connected to the EMS for collecting and analyzing welding data.

[0065] The oil tank seam welding head of the present utility model is combined with a multi-axis industrial robotic arm to form an oil tank seam welding robot, and further enables the direct communication between the control systems of the oil tank seam welding head and the multi-axis industrial robotic arm, realizing the synchronous adjustment of control parameters, forming an automated oil tank seam welding system, and performing automated seam welding on the oil tank, which can greatly improve the welding efficiency. Brief Description of the Drawings

[0066] Figure 1 It is a schematic diagram of the overall structure of the automated oil tank seam welding system;

[0067] Figure 2 It is a schematic diagram of the overall structure of the oil tank seam welding robot;

[0068] Figure 3 It is a schematic diagram of the overall structure of the oil tank seam welding head of the present utility model Figure 1 ;

[0069] Figure 4 It is a schematic diagram of the overall structure of the oil tank seam welding head of the present utility model Figure 2 ;

[0070] Figure 5 It is a schematic diagram of the overall structure of the oil tank seam welding head of the present utility model Figure 3 ;

[0071] Figure 6 It is a schematic diagram of the overall structure of the oil tank seam welding head of the present utility model Figure 4 ;

[0072] Figure 7 It is a schematic diagram of the overall structure of the welding wheel device of the present utility model;

[0073] Figure 8 It is a schematic diagram of the overall structure of the installation and drive of the welding wheel device Figure 1 ;

[0074] Figure 9 It is a schematic diagram of the overall structure of the installation and drive of the welding wheel device Figure 2 ;

[0075] Figure 10 Schematic diagram of the overall installation structure of the dressing device for the welding wheel

[0076] Figure 11 Schematic diagram of the overall structure of the vertical dressing device Figure 1 ;

[0077] Figure 12 Schematic diagram of the overall structure of the vertical dressing device Figure 2 ;

[0078] Figure 13 Schematic diagram of the overall structure of the horizontal dressing device

[0079] Figure 14 Schematic diagram of the overall conductive connection structure of the welding wheel device Figure 1 ;

[0080] Figure 15 Schematic diagram of the overall conductive connection structure of the welding wheel device Figure 2 ;

[0081] Figure 16 Schematic diagram of the overall structure of the conductive copper plate

[0082] Figure 17 Schematic diagram of the installation of the gas-liquid distribution and regulation device Detailed implementation manners

[0083] The following further elaborates on the detailed implementation manners of the present utility model in conjunction with the attached drawings.

[0084] The fuel tank seam welding head of the present utility model is mainly installed on an industrial robotic arm to form a fuel tank seam welding robot, and further serves as an automated fuel tank seam welding system to perform automated seam welding on the fuel tank, such as Figure 1 , Figure 2As shown in the figure; several fuel tanks A, B, and C to be welded are placed in the welding area, that is, in front of the robot 1. The end of the robotic arm of the robot 1 is equipped with the fuel tank seam welding head 3 of the present utility model. The robot 1 drives the fuel tank seam welding head 3 to circle around the fuel tanks (A, B, C) to be welded. During the circling process, the fuel tank seam welding head 3 performs welding operations to seam-weld the fuel tanks; by setting multiple fuel tank placement stations, continuous welding operations can be achieved. That is, after welding one fuel tank, it can move to the next station to continue welding operations. After the welding at the station is completed, the fuel tank to be welded can be disassembled and reinstalled; moreover, with this automated fuel tank seam welding system, different models of fuel tanks can be placed at the fuel tank placement stations. Only by setting the parameters can welding operations be directly carried out without adjusting the robot 1 and the fuel tank seam welding head 3, which can improve the operating efficiency of this automated fuel tank seam welding system; and by using multiple fuel tank placement stations, especially a design with 3 stations, it can ensure that 2 stations are simultaneously used for welding operations, improving the welding efficiency. During the process, 1 station is used for fixture adjustment to achieve rapid switching of welding different fuel tanks.

[0085] Beside the robot 1, there is also a test bench 2 for calibrating the fuel tank seam welding head 3 to ensure the welding quality and the accuracy of continuous welding operations.

[0086] The key point of the present utility model is the structural design of the fuel tank seam welding head 3. The overall structure is as Figure 3 、 Figure 4 、 Figure 5 、and Figure 6 shown. It is provided with a frame 32, and each component is installed on the frame 32; at the top of the frame 32, there is a connecting frame 31 for connecting and fixing with the robot 1; on one side of the connecting frame 31, there is an installation frame 312 for installing pipelines. The pipelines are summarized by the workstation, arranged along the robotic arm of the robot 1, and finally introduced into the fuel tank seam welding head 3 of the present utility model through the installation frame 312 to supply power, gas, and water to the fuel tank seam welding head 3 of the present utility model.

[0087] The fuel tank seam welding head 3 includes two welding wheel devices 4, upper and lower. The welding wheel devices 4 are respectively connected to the rotary drive devices 5; among them, the upper welding wheel device 4 and its rotary drive device 5 are fixed on the upper part of the frame 32, while the lower welding wheel device 4 and its rotary drive device 5 are installed on the lifting platform of the lifting drive device 6; driven by the lifting drive device 6, the height distance between the two welding wheel devices 4 can be adjusted relatively; during operation, the lifting drive device 6 drives the lower welding wheel device 4 and its rotary drive device 5 to move upward, so that the rollers of the two welding wheel devices 4 clamp the edge of the fuel tank to be welded; after the operation is completed, the lifting drive device 6 drives the lower welding wheel device 4 and its rotary drive device 5 to move downward, so that the rollers of the two welding wheel devices 4 move away from each other, exposing a larger gap, which is convenient for leaving the fuel tank and other operations.

[0088] Trimming devices 7 are respectively installed on the sides of the upper and lower two welding wheel devices 4, which can trim the surface of the rollers, thereby ensuring the welding quality.

[0089] A transformer 8 is fixed on the frame 32, so that after the welding power supply is transformed, it is directly supplied to the welding wheel device 4 for welding, thereby reducing line loss and improving the utilization of electric energy; at the same time, since the transformer 8 is directly installed on the frame 32 of the oil tank seam welding head of the present utility model, a higher current can be used, avoiding the problem that a sufficiently thick conductive cable cannot be arranged along the robotic arm 1.

[0090] A gas-liquid distribution and regulation device 9 is fixed on the frame 32, so that the distance of the gas-liquid transmission pipeline can be fully shortened, the control response speed can be improved, and the gas-liquid control can be made more timely and accurate.

[0091] The welding wheel device 4 has a specific structure as Figure 7 shown, including a roller 41, a main shaft 42, a conductive box 43, a roller cooling box 44, and a rotary drive wheel 45. The roller 41 is fixedly installed at the end of the main shaft 42. The main shaft 42 is rotatably installed in the conductive box 43, and a rotary drive wheel 45 is also fixedly installed on the main shaft 42; a conductive device is provided in the conductive box 43. Reference can be made to the robotic seam welding electrode drive with Chinese patent publication number CN107252963A, the movable conductive structure of the seam welding machine electrode with Chinese patent publication number CN101579781A, or the electrode rotary conductive structure with Chinese patent publication number CN104638489A, etc. Through the conductive structure, the electricity connected to the conductive box 43 is transmitted to the rotating main shaft 42 and finally transmitted to the roller 41.

[0092] For the welding wheel device 4, the whole conductive box 43 is silver-plated, which has good conductivity, high reliability for long-term operation, stable welding current, good corrosion resistance, and longer service life; the main shaft 42 and the roller 41 are made of copper products, which have good conductivity and can efficiently transmit the welding current.

[0093] Since the conductive box 43, the main shaft 42, and the roller 41 will transmit a large amount of current during the welding operation, resulting in heat generation, a water cooling device is provided. Accordingly, a water cooling joint is provided on the conductive box 43 to introduce cooling water into the conductive box 43 to cool the outer surfaces of the conductive box 43 and the main shaft 42; a roller cooling box 44 is provided at the tail of the conductive box 43. The main shaft 42 is a hollow shaft with a cooling water cavity inside. The cooling water cavity is connected to the roller 41. A water cooling joint is provided on the outer side of the roller cooling box 44, and the roller cooling box 44 is connected to the cooling water cavity of the main shaft 42. Therefore, through the roller cooling box 44, the cooling water can be introduced into the main shaft 42 and enter the roller 41 to cool the inside of the main shaft 42 and the roller 41.

[0094] The rotation drive device 5, as shown in Figure 5 , Figure 8 , Figure 9 , includes a drive motor 51, a motor drive wheel 52, and a drive belt 53; the drive motor 51 is a servo motor that can precisely adjust the output speed; the motor drive wheel 52 is installed at the output shaft end of the drive motor 51, and both the motor drive wheel 52 and the rotation drive wheel 45 are synchronous belt wheels, which are connected by a drive belt 53 (i.e., a synchronous belt). The synchronous belt is generally a non-metallic braided belt with good insulation and good synchronous transmission performance, and can transmit a large torque. Therefore, the drive motor 51 can drive the roller 41 to perform precise rotational motion.

[0095] The lifting drive device 6, as shown in Figure 8 , Figure 9 , includes a lifting cylinder 61. The cylinder body of the lifting cylinder 61 is fixed on the frame 32, and a lifting platform 62 is installed at the end of the piston rod of the lifting cylinder 61. The lower welding wheel device 4 and its rotation drive device 5 are directly fixed on the lifting platform 62 or are connected and fixed to the lifting platform 62 through a bracket. To ensure the smoothness of the lifting motion, a guiding device is provided between the lifting platform 62 and the side wall of the frame 32, which specifically includes 4 pairs of lifting linear sliders 63 and lifting linear guide rails 64. The lifting linear sliders 63 are fixed on the lifting platform 62 through an adapter bracket, while the lifting linear guide rails 64 are vertically fixed inside the side wall of the frame 32. The lifting linear sliders 63 match the lifting linear guide rails 64 to reliably guide the lifting motion of the lower welding wheel device 4, its rotation drive device 5, and the lifting platform 62, and to prevent excessive pressure between the rollers 41 of the two welding wheel devices 4 during welding, which may cause the lower welding wheel device 4 to skew.

[0096] Since the guiding device is arranged close to the welding wheel device 4, to avoid the electromagnetic influence of the large current during welding on the guiding device, resulting in heat generation and volatilization of the internal grease, which affects the guiding performance, the guiding device here is preferably a stainless steel guiding device to avoid the generation of eddy currents.

[0097] The trimming device 7, the specific structure of which is as shown in Figure 10 , Figure 11 , Figure 12 , and Figure 13 . Due to space limitations, the trimming device 7 installed on the side of the upper welding wheel device 4 is a horizontally arranged trimming device 7, while the trimming device 7 installed on the side of the lower welding wheel device 4 is a vertically arranged trimming device 7.

[0098] The horizontally arranged trimming device 7 and the vertically arranged trimming device 7 have the same main structure, including a trimming blade 71, a tool holder 72, a trimming cylinder 73, and a trimming linear guiding device. The trimming blade 71 has a blade shape matching the outer surface shape of the roller 41, and can re-trim the worn roller 41 into the designed surface shape; the trimming blade 71 is fixedly installed in the tool holder 72 with the blade exposed; the tool holder 72 is installed at the end of the output piston rod of the trimming cylinder 73, and the trimming cylinder 73 drives the tool holder 72 and the trimming blade 71 to move, approaching or moving away from the roller 41. In order to improve the reliability during the trimming process after the trimming blade 71 contacts the roller 41, a trimming linear guiding device is provided between the tool holder 72 and the fixed bracket. Specifically, it includes a trimming linear slider 74 fixed to the tool holder 72 and a trimming linear slide rail 75 connected to the fixed bracket. The trimming linear slider 74 matches the trimming linear slide rail 75, so as to bear the force in the direction perpendicular to the axis of the trimming blade 71 generated during the trimming of the roller 41 by the trimming blade 71.

[0099] Furthermore, a dust collecting hopper 76 is provided on the tool holder 72, and the dust collecting opening 761 of the dust collecting hopper 76 is arranged close to the trimming blade 71; furthermore, according to the differences between the horizontally arranged trimming device 7 and the vertically arranged trimming device 7, such as Figure 13 shown, the dust collecting opening 761 of the dust collecting hopper 76 of the horizontally arranged trimming device 7 is located below the trimming blade 71 and extends horizontally beyond the blade end of the trimming blade 71. In this way, the dust and chips generated by the trimming blade 71 trimming the roller 41 will fall by gravity and fall into the dust collecting hopper 76 through the dust collecting opening 761, avoiding splashing everywhere. And as Figure 11 、 Figure 12 shown, the dust collecting openings 761 of the dust collecting hopper 76 of the vertically arranged trimming device 7 are located on both sides of the trimming blade 71 and are vertically lower than the blade end of the trimming blade 71. Similarly, the dust and chips generated by the trimming blade 71 trimming the roller 41 will fall by gravity and fall into the dust collecting hopper 76 through the dust collecting openings 761 near both sides, avoiding splashing everywhere.

[0100] The transformer 8, as Figure 14 、 Figure 15 shown, the positive and negative poles are respectively connected to the conductive box 43 of the welding wheel device 4 located below through the first conductive copper plate 81 and directly connected to the conductive box 43 of the welding wheel device 4 located above through the second conductive copper plate 82.

[0101] Since the welding wheel device 4 located below needs to move up and down with the lifting platform 62, its position relative to the transformer 8 is not fixed, so a conductive flexible connection 812, such as a copper foil flexible connection, a copper wire flexible connection, etc., is preferably provided between the first conductive copper plate 81 and the conductive box 43, so that a reliable conductive connection is achieved between the conductive copper plate and the conductive box 43. Preferably, a conductive connecting plate 622 is provided on the lifting platform 62, which is a copper plate that can pass a large current, one end of which is connected to the conductive flexible connection 812, and the other end is directly connected to the conductive box 43.

[0102] Since the conductive copper plates (the first conductive copper plate 81 and the second conductive copper plate 82) transmit a very large current during the welding process, thereby generating heat, a cooling water channel 94 is provided in the conductive copper plates, through which circulating cooling water can be introduced to cool the conductive copper plates in time.

[0103] Gas-liquid distribution regulating device 9, such as Figure 15 , Figure 17 As shown, it is fixed on the frame 32 and is arranged near the cylinder and the cooling water device, so that the connecting pipe can be saved and the control response is more timely. Each cooling water device is provided with a water cooling joint 95 for connecting the water cooling pipe.

[0104] The fuel tank seam welding head of the utility model is required by functions, so the welding wheel device 4 body, the transformer 8, the conductive copper plate, etc. are all made of copper, so they are heavier; therefore, in order to reduce the overall weight, the frame 32 is made of high-strength aluminum alloy, and the cylinder, etc. are made of aluminum alloy.

[0105] The oil tank seam welding head of the utility model has a more integrated structure and a reasonable overall weight. It can be installed at the end of the mechanical arm of the robot 1. As the mechanical arm of the robot 1 moves around the oil tank, the roller 41 of the welding wheel device 4 clamps the edge of the oil tank, and a large current is passed to perform welding. During the process, the mechanical arm moves the oil tank seam welding head along the edge of the oil tank, and the rotary drive device 5 rolls the roller 41, so that the roller 41 presses the edge of the oil tank while rolling along the edge of the oil tank, so as to avoid sliding friction as much as possible, which may cause the roller 41 to be damaged too quickly, and also avoid sliding to cause poor welding surface quality.

[0106] During the welding process, the roller 41 will always be damaged. At this time, the roller 41 is trimmed by the trimming device 7. During the trimming process, the trimming cylinder 73 drives the blade of the blade 71 to rest against the surface of the roller 41, and the rotary drive device 5 rotates the roller 41, so as to trim the roller 41 by utilizing the relative movement between the blade and the roller 41; by adjusting the pressure of the compressed air in the trimming cylinder 73, the cutting force of the blade of the blade 71 can be adjusted, thereby adjusting the trimming amount of the surface of the roller 41; after the trimming is completed, because the diameter of the roller 41 is reduced, it is necessary to use the test bench 2 to test the diameter of the roller 41, especially the position The diameter of the roller 41 of the upper welding wheel device 4 is measured and calibrated, so that in the next welding operation, the mechanical arm of the robot 1 can drive the oil tank seam welding head to press down a certain size more to make up for the gap caused by the smaller diameter of the roller 41, so that the roller 41 of the upper welding wheel device 4 is always pressed on the upper surface of the edge of the oil tank during welding, that is, there is no virtual contact, and there is no deformation of the edge of the oil tank due to overpressure. Then, the roller 41 of the lower welding wheel device 4 is driven by the lifting drive device 6 to push up, and the upper and lower rollers 41 are pressed on the upper and lower surfaces of the edge of the oil tank at the same time, and then power is turned on to carry out the welding operation.

[0107] After using the test bench 2 to detect the diameter of the roller 41, the output of the drive motor 51 of the rotation drive device 5 can be synchronously adjusted to make the rolling linear speeds of the upper and lower rollers 41 consistent, and the rolling linear speed of the roller 41 is consistent with the movement speed of the robot arm of the robot 1, thereby avoiding welding quality problems caused by inconsistent linear speeds, such as the robot arm moving too fast, causing the roller 41 to slide on the side of the oil tank, or the roller 41 rolling too fast, causing rolling marks on the side of the oil tank after welding, etc.

[0108] During the welding operation, a relatively small air pressure can be introduced into the dressing cylinder 73 of the dressing device 7, so that the blade of the blade 71 is always against the surface of the roller 41, and the dust and debris adhering to the surface of the roller 41 during the welding process are cleaned off in time to avoid sticking to the surface of the roller 41, which will affect the welding quality and the roller 41; by using a relatively small air pressure, the blade of the blade 71 will not cut the roller 41 during this process, so that its diameter becomes smaller.

[0109] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all within the scope defined by the claims of this application.

Claims

1. The fuel tank seam welding head is characterized in that, There is a frame; The fuel tank seam welding head includes two welding wheel devices, upper and lower, and the welding wheel devices are respectively connected to the rotary drive devices; Among them, the upper welding wheel device and its rotary drive device are fixed on the upper part of the frame; the lower welding wheel device and its rotary drive device are installed on the lifting platform of the lifting drive device; the lifting drive device drives the lower welding wheel device to perform vertical lifting movement relative to the upper welding wheel device; Dressing devices are respectively installed on the sides of the two welding wheel devices, upper and lower; A transformer is fixed on the frame, and the positive and negative poles of the transformer are respectively connected to the two welding wheel devices, upper and lower, through conductive copper plates; The welding wheel device is provided with a rotatable roller; the roller is respectively electrically connected to the positive and negative poles of the transformer; A gas-liquid distribution and regulation device is fixed on the frame, and the gas-liquid distribution and regulation device is connected to the gas-using or cooling water-using device through a pipeline; The cables, air pipes, and circulating cooling water pipes are gathered together and arranged along the robotic arm.

2. The fuel tank seam welding head according to claim 1, characterized in that The welding wheel device includes a roller, a main shaft, a conductive box, and a rotary drive wheel; The roller is fixedly installed at the end of the main shaft; The main shaft is rotatably installed in the conductive box, and a rotary drive wheel is also fixedly installed on the main shaft; the rotary drive wheel is located between the roller and the conductive box; A rotary conductive device is provided in the conductive box; the outer surface of the conductive box is electrically connected to one pole of the transformer.

3. The fuel tank seam welding head according to claim 2, characterized in that, The inside of the conductive box is a water-cooling chamber, and the conductive box is provided with a water-cooling joint, which is connected to the circulating cooling water pipe.

4. The fuel tank seam welding head according to claim 3, characterized in that, A roller cooling box is provided at the tail of the conductive box; The main shaft is a hollow shaft, and a cooling water chamber is provided inside, and the cooling water chamber is communicated with the roller; A water-cooling joint is provided on the outer side of the roller cooling box, which is connected to the circulating cooling water pipe; The cooling water chamber in the roller cooling box is communicated with the cooling water chamber of the main shaft.

5. The fuel tank seam welding head according to claim 2, characterized in that, The rotary drive device includes a drive motor, a motor drive wheel, and a drive belt; The drive motor is a servo motor; A motor drive wheel is installed at the output shaft end of the drive motor; The motor drive wheel and the rotary drive wheel are both synchronous belt wheels; The motor drive wheel and the rotary drive wheel are connected by a drive belt.

6. The fuel tank seam welding head according to claim 1, characterized in that, The lifting drive device includes a lifting cylinder, the cylinder body of the lifting cylinder is fixed on the frame, and a lifting platform is installed at the end of the piston rod of the lifting cylinder; The lower welding wheel device is directly fixed on the lifting platform; The lower rotary drive device bracket is connected and fixed on the lifting platform.

7. The fuel tank seam welding head according to claim 6, characterized in that, A guiding device is provided between the lifting platform and the side wall of the frame; The guiding device includes four pairs of lifting linear sliders and lifting linear slide rails; The lifting linear sliders are fixed on the lifting platform through adapter brackets; The lifting linear slide rails are vertically fixed on the inner side of the side wall of the frame; The lifting linear sliders match the lifting linear slide rails.

8. The fuel tank seam welding head according to claim 1, characterized in that, The dressing device installed on the side of the upper welding wheel device is a horizontally arranged dressing device; the dressing device installed on the side of the lower welding wheel device is a vertically arranged dressing device; The dressing device includes a dressing blade, a tool holder, a dressing cylinder, and a dressing linear guiding device; The dressing blade has a blade shape matching the outer surface shape of the roller; The dressing blade is fixedly installed in the tool holder and exposes the blade; The tool holder is installed at the end of the output piston rod of the dressing cylinder, and the dressing cylinder drives the tool holder and the dressing blade to move, approaching or moving away from the roller; A dressing linear guiding device is provided between the tool rest and the fixed bracket of the dressing device, which includes a dressing linear slider fixed to the tool rest and a dressing linear slide rail connected to the fixed bracket, and the dressing linear slider is matched with the dressing linear slide rail.

9. The fuel tank seam welding head according to claim 1, characterized in that, One pole of the transformer is connected to the conductive box of the welding wheel device located below through a first conductive copper plate; A conductive flexible connection is provided between the first conductive copper plate and the conductive box; The other pole of the transformer is directly connected to the conductive box of the welding wheel device located above through a second conductive copper plate.

10. The fuel tank seam welding head according to claim 9, characterized in that, Cooling water channels are provided in the first conductive copper plate and the second conductive copper plate; The cooling water channels are connected to the circulating cooling water pipe through water-cooling connectors.

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