Flexible welding production line for body-in-white of heavy truck

Abstract

The invention discloses a flexible welding production line for a heavy truck body in white. The flexible welding production line comprises a conveying line, a first manipulator assembly and a second manipulator assembly. The conveying line is sequentially provided with a skid on-line station, a first welding station, a reserved extension station, a second welding station and a skid off-line station from right to left. When a common vehicle body is welded, the first mechanical arm assembly assembles common vehicle body accessories to the floor on the first welding position, and positioning welding is carried out; the second manipulator assembly is used for welding other point positions of the workpiece which is positioned and welded on the second welding position; the workpieces subjected to point welding are moved out of the conveying line from the skid off-line station; when the long vehicle type vehicle body is welded, the extension position, the first welding position and the second welding position are reserved to form a welding position of the long vehicle type vehicle body, long vehicle type vehicle body accessories are assembled on a floor, and all point positions are welded; and the workpieces subjected to point welding are moved out of the conveying line from the skid off-line station.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle body welding production lines, in particular to a heavy truck body-in-white flexible welding production line. Background Art

[0002] In the production process of heavy trucks, body-in-white welding is a key link. Traditional welding production lines are usually designed for a single model or a few similar models and lack flexibility. With the growing market demand for diversified heavy truck models, traditional production lines are unable to quickly adapt to the production switching of different models, resulting in low production efficiency and increased costs. For example, when a new model needs to be produced, it is often necessary to carry out large-scale transformation of the production line, which consumes a lot of time and money. Moreover, the number, location and welding process requirements of different models of welding points vary greatly. Traditional production lines cannot flexibly adjust welding parameters and operation processes, and it is difficult to ensure the consistency of welding quality.

[0003] Therefore, a flexible welding production line for heavy truck body-in-white is proposed. Summary of the invention

[0004] The object of the present invention is to provide a flexible welding production line for a heavy truck body-in-white, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: a heavy truck body-in-white flexible welding production line, the welding production line comprising:

[0006] A conveyor line, a first robot assembly and a second robot assembly;

[0007] The conveyor line is provided with a sled on-line station, a first welding station, a reserved expansion station, a second welding station and a sled off-line station in sequence from right to left;

[0008] The floor is delivered to the on-line station of the sled via a sled;

[0009] When welding ordinary car bodies:

[0010] The first manipulator assembly assembles the common body parts to the floor at the first welding position and performs positioning welding;

[0011] The second manipulator assembly performs other point welding on the workpiece that has completed positioning welding at the second welding position;

[0012] The workpiece after all the point welding is completed is moved out of the conveyor line from the downline workstation of the slide;

[0013] When welding long vehicle bodies:

[0014] The reserved extension position, the first welding position and the second welding position form a welding position of a long vehicle body;

[0015] The first manipulator assembly and the second manipulator assembly cooperate to assemble the long vehicle body parts on the floor and perform welding at all points;

[0016] The workpiece after all the point welding is completed is moved out of the conveyor line from the downline workstation of the slide.

[0017] In a heavy truck body-in-white flexible welding production line according to the present invention, optionally, the first manipulator assembly includes a first manipulator, a second manipulator, a third manipulator and a fourth manipulator, the first manipulator and the third manipulator are located at two ends of one side of the first welding position, and the second manipulator and the fourth manipulator are located at two ends of the other side of the first welding position;

[0018] The second manipulator assembly includes a fifth manipulator and a sixth manipulator;

[0019] The fifth manipulator and the sixth manipulator are respectively arranged on both sides of the second welding position, and the fifth manipulator and the fourth manipulator are located on the same side.

[0020] In a heavy truck body-in-white flexible welding production line according to the present invention, optionally, a first placement table, a second placement table, a third placement table, a fourth placement table and a fifth placement table are respectively arranged around the conveyor line;

[0021] When welding ordinary car bodies:

[0022] The first placement table is used to place the rear enclosure assembly, and the rear enclosure assembly is buckled onto the floor by the second manipulator;

[0023] The second placement platform is used to place the left side panel assembly, and the left side panel assembly is buckled onto the floor by the first manipulator;

[0024] The third placement platform is used to place the right side enclosure assembly, and the right side enclosure assembly is buckled onto the floor by the fourth manipulator;

[0025] The fourth placement platform is used to place the top cover assembly, and the top cover assembly is buckled onto the floor by the third manipulator;

[0026] When welding long vehicle bodies:

[0027] The second placement table is used to place the front cover assembly, and the front cover assembly is buckled onto the floor by the first manipulator and the third manipulator;

[0028] The fourth placement table is used to place the left front door assembly and the left rear door assembly, and the left front door assembly and the left rear door assembly are both buckled onto the floor by the third manipulator and the sixth manipulator;

[0029] The third placement platform is used to place the rear cover assembly and the back door assembly, and the rear cover assembly and the back door assembly are both buckled onto the floor by the second manipulator and the fourth manipulator;

[0030] The fifth placement platform is used for placing the right front door assembly and the rear door assembly, and the right front door assembly and the rear door assembly are both buckled onto the floor through the fourth manipulator and the fifth manipulator.

[0031] In a heavy truck body-in-white flexible welding production line according to the present invention, optionally, the conveyor line is formed by splicing eight groups of roller beds.

[0032] In a heavy truck body-in-white flexible welding production line according to the present invention, optionally, a plurality of grippers are arranged around the conveyor line, and a placement rack for placing the grippers is configured.

[0033] In a heavy-duty truck body-in-white flexible welding production line according to the present invention, optionally, the gripper includes a front enclosure assembly gripper, a left enclosure assembly gripper, a right enclosure assembly gripper, a rear enclosure assembly gripper, a top cover assembly gripper, a front cover assembly gripper, a left front door assembly gripper, a left rear door gripper, a right front door assembly gripper, a right rear door assembly gripper, a rear cover assembly gripper and a back door assembly gripper.

[0034] In a heavy truck body-in-white flexible welding production line according to the present invention, optionally, the first manipulator, the second manipulator, the third manipulator, the fourth manipulator, the fifth manipulator and the sixth manipulator are all equipped with welding guns around them, and a welding gun rack for placing the welding guns is provided.

[0035] In a heavy truck body-in-white flexible welding production line according to the present invention, optionally, the sled upper line station and the first welding station are both provided with a welding fume purification device, and the processing air volume of the welding fume purification device is 8000m 3 / h, the filtration efficiency is not less than 99%.

[0036] In a heavy truck body-in-white flexible welding production line according to the present invention, optionally, the bottom of the third manipulator, the bottom of the fourth manipulator, the bottom of the fifth manipulator and the bottom of the sixth manipulator are all provided with linear modules.

[0037] In a heavy truck body-in-white flexible welding production line according to the present invention, optionally, a safety grating for ensuring the safety of operators is arranged around the conveyor line.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The production line is equipped with a reserved expansion position, which can easily meet the welding needs of ordinary and long-type bodies. When welding ordinary bodies, each station has a clear division of labor. The first robot assembly completes the positioning welding at the first welding position, and the second robot assembly performs the remaining welding at the second welding position. When welding long-type bodies, the reserved expansion position and the first and second welding positions together form a larger welding area, so that the first and second robot assemblies can work together to complete the welding of all points of the long-type body. This design avoids the company from repeatedly building production lines for different models, greatly reducing production costs and improving the versatility and utilization of the production line;

[0040] The first, second, third, fourth and fifth placement tables around the conveyor line can place corresponding body parts according to the welding requirements of different models. For example, the rear panel, side panel, top cover and other assemblies are placed when welding ordinary body; the front cover, front and rear doors and other assemblies are placed when welding long body. The manipulator can grab the parts from the corresponding placement table according to the specific production task, realizing the flexible switching of material supply in the production process of different models, further enhancing the flexibility of the production line;

[0041] The first manipulator, the second manipulator, the third manipulator and the fourth manipulator of the first manipulator assembly are distributed at both ends of the first welding position, and the fifth manipulator and the sixth manipulator of the second manipulator assembly are arranged on both sides of the second welding position. This layout enables each manipulator to fully cover the welding area during operation, reduces the moving distance and time of the manipulator, and improves the welding efficiency. At the same time, each manipulator has a clear division of labor and works in coordination, avoiding mutual interference, and further improving the overall production efficiency;

[0042] The bottom of the third, fourth, fifth and sixth manipulators are all equipped with linear modules. The linear modules enable the manipulator to move flexibly in the horizontal direction, expand the working range of the manipulator, enable it to reach the welding position more accurately, and improve welding accuracy and efficiency. Especially when processing larger workpieces such as long vehicle bodies, the role of the linear modules is more obvious, which can effectively improve the adaptability of the production line to workpieces of different sizes;

[0043] The entire production line occupies a small area and has a low investment cost, and the production line can be expanded as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of the heavy truck body-in-white flexible welding production line of the present invention.

[0045] In the figure: 1. Sled on-line station; 2. First welding station; 3. Second welding station; 4. Sled off-line station; 5. Transition station; 6. Reserved expansion station; 7. First manipulator; 8. Second manipulator; 9. Third manipulator; 10. Fourth manipulator; 11. Fifth manipulator; 12. Sixth manipulator; 13. Linear module; 14. First placement table; 15. Second placement table; 16. Third placement table; 17. Fourth placement table; 18. Fifth placement table. DETAILED DESCRIPTION

[0046] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0047] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0048] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0049] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Example

[0051] See also Figure 1The present embodiment provides a heavy-duty truck body-in-white flexible welding production line, the welding production line comprising: a conveyor line, a first manipulator assembly and a second manipulator assembly; a sled on-line station 1, a first welding station 2, a reserved extension station 6, a second welding station 3 and a sled off-line station 4 are arranged on the conveyor line from right to left; the floor is delivered to the sled on-line station 1 by a sled.

[0052] Among them, when welding a normal type car body: the first manipulator assembly assembles the normal type car body accessories to the floor at the first welding position 2, and performs positioning welding; the second manipulator assembly performs the remaining point welding on the workpiece that has completed positioning welding at the second welding position 3; the workpiece that has completed all point welding is moved out of the conveyor line from the skid offline station 4.

[0053] Among them, when welding a long vehicle body: the reserved extension position 6, the first welding position 2 and the second welding position 3 form the welding position of the long vehicle body; the first manipulator assembly and the second manipulator assembly cooperate to assemble the long vehicle body accessories on the floor, and perform welding at all points; the workpiece after all points are welded is moved out of the conveyor line from the slide offline station 4.

[0054] When in use, the conveyor line is used to convey the skid and the floor carried on it, and deliver them to each workstation in turn. For ordinary car bodies, the first manipulator assembly first performs preliminary assembly and positioning welding at the first welding position 2 to determine the general frame of the car body, and then the second manipulator assembly completes the fine welding of the remaining points at the second welding position 3. For long car bodies, due to their longer length, the reserved extension position 6 is used to join the welding work, and the first and second manipulator assemblies work together to complete the entire welding process. Finally, the welded workpiece leaves the production line from the skid off-line station 4. By setting up the reserved extension position 6, the production line has the ability to produce car bodies of different lengths, which improves the versatility and flexibility of the production line and reduces the cost of enterprises to build multiple production lines for the production of different car models.

[0055] Among them, the welding production line is 29500mm in length and 12700mm in width, with the characteristics of small footprint and simple structure.

[0056] In this embodiment, the first manipulator assembly includes a first manipulator 7, a second manipulator 8, a third manipulator 9 and a fourth manipulator 10. The first manipulator 7 and the third manipulator 9 are located at two ends of one side of the first welding position 2, and the second manipulator 8 and the fourth manipulator 10 are located at two ends of the other side of the first welding position 2; the second manipulator assembly includes a fifth manipulator 11 and a sixth manipulator 12; the fifth manipulator 11 and the sixth manipulator 12 are respectively arranged on both sides of the second welding position 3, and the fifth manipulator 11 and the fourth manipulator 10 are located on the same side. At the first welding position 2, the first manipulator 7, the second manipulator 8, the third manipulator 9 and the fourth manipulator 10 grab, assemble and position weld ordinary body parts on the floor from different positions, making full use of space and improving work efficiency. At the second welding position 3, the fifth manipulator 11 and the sixth manipulator 12 perform the remaining point welding on the workpiece that has completed the positioning welding from both sides. This layout allows each manipulator to fully cover the welding area, reduces the moving distance and time of the manipulator, improves the welding efficiency, and each manipulator has a clear division of labor, avoiding mutual interference and ensuring the orderly progress of the welding work.

[0057] In this embodiment, a first placement platform 14, a second placement platform 15, a third placement platform 16, a fourth placement platform 17 and a fifth placement platform 18 are respectively disposed around the conveyor line.

[0058] When welding a normal car body: the first placement table 14 is used to place the rear enclosure assembly, which is buckled onto the floor by the second manipulator 8; the second placement table 15 is used to place the left enclosure assembly, which is buckled onto the floor by the first manipulator 7; the third placement table 16 is used to place the right enclosure assembly, which is buckled onto the floor by the fourth manipulator 10; the fourth placement table 17 is used to place the top cover assembly, which is buckled onto the floor by the third manipulator 9.

[0059] When welding a long vehicle body: the second placement platform 15 is used to place the front cover assembly, which is snapped onto the floor by the first manipulator 7 and the third manipulator 9; the fourth placement platform 17 is used to place the left front door assembly and the left rear door assembly, which are snapped onto the floor by the third manipulator 9 and the sixth manipulator 12; the third placement platform 16 is used to place the rear cover assembly and the back door assembly, which are snapped onto the floor by the second manipulator 8 and the fourth manipulator 10; the fifth placement platform 18 is used to place the right front door assembly and the back door assembly, which are snapped onto the floor by the fourth manipulator 10 and the fifth manipulator 11. Through the above settings, the production line can flexibly adjust the material supply according to the needs of different vehicle models, thereby improving the flexibility and adaptability of the production line. At the same time, the manipulator grabs the material nearby, which reduces the moving distance and improves the assembly efficiency.

[0060] In this embodiment, the conveyor line is composed of eight groups of roller beds. The standardized roller bed splicing method facilitates the installation, commissioning and maintenance of the conveyor line. When a group of roller beds fails, it can be quickly replaced, reducing equipment downtime and ensuring the continuous and stable operation of the production line.

[0061] In this embodiment, a variety of grippers are arranged around the conveyor line, and a placement rack for placing the grippers is configured. The grippers include a front enclosure assembly gripper, a left enclosure assembly gripper, a right enclosure assembly gripper, a rear enclosure assembly gripper, a top cover assembly gripper, a front cover assembly gripper, a left front door assembly gripper, a left rear door gripper, a right front door assembly gripper, a right rear door assembly gripper, a rear cover assembly gripper and a back door assembly gripper. When different body assemblies are required for assembly, the robot can select a suitable gripper from the placement rack, and then use the gripper to grab the corresponding assembly for operation.

[0062] In this embodiment, the periphery of the first manipulator 7, the second manipulator 8, the third manipulator 9, the fourth manipulator 10, the fifth manipulator 11 and the sixth manipulator 12 are all equipped with welding guns, and a welding gun rack for placing welding guns is provided. When the manipulator performs welding operations, the welding gun is taken from the welding gun rack, and the welding gun is returned to the welding gun rack after the welding task is completed. The setting of the welding gun rack enables the welding guns to be stored in an orderly manner, which is convenient for the manipulator to take and store the welding guns at any time. At the same time, it is convenient to carry out daily maintenance and management of the welding gun, ensure the normal use of the welding gun, and improve the continuity and stability of the welding work.

[0063] In this embodiment, both the sled on-line station 1 and the first welding station 2 are equipped with welding fume purification devices, and the processing air volume of the welding fume purification device is 8000m 3 / h, the filtration efficiency is not less than 99%. When welding is carried out at the sled on-line station 1 and the first welding station 2, the welding fume purification device is operated at 8000m 3 / h of processing air volume will inhale the generated smoke and dust, and after passing through the filtering device, the filtering efficiency is not less than 99%, and the purified air is discharged, which improves the air quality of the workshop and protects the health of the operators. In this embodiment, the bottom of the third manipulator 9, the bottom of the fourth manipulator 10, the bottom of the fifth manipulator 11 and the bottom of the sixth manipulator 12 are all provided with a linear module 13, and the linear module 13 can drive the third manipulator 9, the fourth manipulator 10, the fifth manipulator 11 and the sixth manipulator 12 to move linearly in the horizontal direction, thereby expanding the working range of the manipulator, especially when processing larger-sized workpieces such as long-type car bodies, enabling the manipulator to reach the welding position more accurately, improving the welding accuracy and efficiency, and further improving the adaptability of the production line to workpieces of different sizes.

[0064] In this embodiment, a safety grating is arranged around the conveyor line to ensure the safety of operators.

[0065] Working principle: The safety grating forms a light curtain by emitting and receiving light. When an operator enters the dangerous area around the conveyor line, it will block the light. After the safety grating detects the light change, it will immediately send out an alarm signal and trigger the emergency stop mechanism of the production line, providing reliable safety protection for the operator, effectively avoiding safety accidents such as collisions between operators and running equipment, reducing safety risks in the production process, and ensuring safe production.

[0066] When welding a normal car body, the sled transports the floor to the sled on-line station 1, and then enters the first welding station 2. The first manipulator 7, the second manipulator 8, the third manipulator 9 and the fourth manipulator 10 located at the four corners of the first welding station 2 grab the normal car body accessories such as the rear enclosure assembly, the left enclosure assembly, the right enclosure assembly and the top cover assembly from the first placement table 14, the second placement table 15, the third placement table 16 and the fourth placement table 17 corresponding to the periphery of the conveyor line, assemble them on the floor using appropriate grippers, and perform positioning welding. After the positioning welding is completed, the sled transports the workpiece to the second welding station 3, and the fifth manipulator 11 and the sixth manipulator 12 arranged on both sides of the second welding station 3 weld the remaining points of the workpiece. Finally, the workpiece that has completed all point welding is moved out of the conveyor line from the sled off-line station 4.

[0067] When welding a long vehicle body, after the sled delivers the floor to the sled upper line station 1, the reserved extension station 6 together with the first welding station 2 and the second welding station 3 form a welding area. The first manipulator 7 and the third manipulator 9 grab the front cover assembly from the second placement table 15 and snap it onto the floor; the third manipulator 9 and the sixth manipulator 12 grab the left front door assembly and the left rear door assembly from the fourth placement table 17 for installation; the second manipulator 8 and the fourth manipulator 10 grab the rear cover assembly and the back door assembly from the third placement table 16 to complete the assembly; the fourth manipulator 10 and the fifth manipulator 11 grab the right front door assembly and the rear door assembly from the fifth placement table 18 for snapping. At the same time, the linear module 13 at the bottom of the third manipulator 9, the fourth manipulator 10, the fifth manipulator 11 and the sixth manipulator 12 drives the manipulator to move in the horizontal direction, expanding the operating range and ensuring that the welding of all points of the long vehicle body can be completed. After welding is completed, the workpiece is also moved out of the sled lower line station 4. During the entire welding process, the welding fume purification device of the skid upper line station 1 and the first welding station 2 is 8000m 3 / h of air volume, with a filtration efficiency of no less than 99%, effectively purifying the smoke generated by welding. The safety gratings set around the conveyor line monitor in real time. If someone enters the dangerous area, an alarm will be immediately issued and the emergency stop mechanism can be triggered to ensure the safety of the operator. The welding guns equipped around each manipulator are placed on the welding gun rack for easy access and management, and the racks around the conveyor line store a variety of grippers, which makes it convenient for the manipulator to replace the appropriate gripper according to different tasks.

[0068] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heavy truck body-in-white flexible welding production line, characterized in that: The welding production line comprises: A conveyor line, a first robot assembly and a second robot assembly; The conveyor line is provided with a sled upper line station (1), a first welding station (2), a reserved expansion station (6), a second welding station (3) and a sled lower line station (4) in sequence from right to left; The floor is transported to the sled on-line station (1) via a sled; When welding ordinary car bodies: The first manipulator assembly assembles the common body parts to the floor at the first welding position (2) and performs positioning welding; The second manipulator assembly performs welding of the remaining points on the workpiece that has completed positioning welding at the second welding position (3); The workpiece after all the point welding is completed is moved out of the conveyor line from the slide downline station (4); When welding long vehicle bodies: The reserved extension position (6), the first welding position (2) and the second welding position (3) form a welding position for a long vehicle body; The first manipulator assembly and the second manipulator assembly cooperate to assemble the long vehicle body parts on the floor and perform welding at all points; The workpiece after all the point welding is completed is moved out of the conveyor line from the slide down-line station (4).

2. According to claim 1, a heavy truck body-in-white flexible welding production line is characterized by: The first manipulator assembly comprises a first manipulator (7), a second manipulator (8), a third manipulator (9) and a fourth manipulator (10); the first manipulator (7) and the third manipulator (9) are located at two ends of one side of the first welding position (2); and the second manipulator (8) and the fourth manipulator (10) are located at two ends of the other side of the first welding position (2); The second manipulator assembly comprises a fifth manipulator (11) and a sixth manipulator (12); The fifth manipulator (11) and the sixth manipulator (12) are respectively arranged on both sides of the second welding position (3), and the fifth manipulator (11) and the fourth manipulator (10) are located on the same side.

3. The heavy truck body-in-white flexible welding production line according to claim 2 is characterized in that: The periphery of the conveyor line is respectively provided with a first placement table (14), a second placement table (15), a third placement table (16), a fourth placement table (17) and a fifth placement table (18); When welding ordinary car bodies: The first placement table (14) is used to place the rear enclosure assembly, and the rear enclosure assembly is buckled onto the floor by the second manipulator (8); The second placement platform (15) is used to place the left side panel assembly, and the left side panel assembly is buckled onto the floor by the first manipulator (7); The third placement platform (16) is used to place the right side enclosure assembly, and the right side enclosure assembly is buckled onto the floor through the fourth manipulator (10); The fourth placement platform (17) is used to place the top cover assembly, and the top cover assembly is buckled onto the floor through the third manipulator (9); When welding long vehicle bodies: The second placement platform (15) is used to place the front cover assembly, and the front cover assembly is buckled onto the floor by the first manipulator (7) and the third manipulator (9); The fourth placement platform (17) is used to place the left front door assembly and the left rear door assembly, and the left front door assembly and the left rear door assembly are both buckled onto the floor by the third manipulator (9) and the sixth manipulator (12); The third placement platform (16) is used to place the rear cover assembly and the back door assembly, and the rear cover assembly and the back door assembly are both buckled onto the floor by the second manipulator (8) and the fourth manipulator (10); The fifth placement platform (18) is used to place the right front door assembly and the rear door assembly, and the right front door assembly and the rear door assembly are both fastened to the floor by the fourth manipulator (10) and the fifth manipulator (11).

4. The heavy truck body-in-white flexible welding production line according to claim 3 is characterized by: The conveyor line is formed by splicing eight groups of roller beds.

5. The heavy truck body-in-white flexible welding production line according to claim 3 is characterized by: A variety of grippers are arranged around the conveyor line, and a placement rack is configured for placing the grippers.

6. The heavy truck body-in-white flexible welding production line according to claim 5 is characterized by: The grab handles include a front enclosure assembly grab handle, a left enclosure assembly grab handle, a right enclosure assembly grab handle, a rear enclosure assembly grab handle, a top cover assembly grab handle, a front cover assembly grab handle, a left front door assembly grab handle, a left rear door grab handle, a right front door assembly grab handle, a right rear door assembly grab handle, a rear cover assembly grab handle and a back door assembly grab handle.

7. The heavy truck body-in-white flexible welding production line according to claim 6 is characterized by: The first manipulator (7), the second manipulator (8), the third manipulator (9), the fourth manipulator (10), the fifth manipulator (11) and the sixth manipulator (12) are all equipped with welding guns around their peripheries, and a welding gun rack is provided for placing the welding guns.

8. The heavy truck body-in-white flexible welding production line according to claim 7 is characterized in that: The sled on-line workstation (1) and the first welding station (2) are both provided with a welding fume purification device, and the processing air volume of the welding fume purification device is 8000m 3 / h, the filtration efficiency is not less than 99%.

9. The heavy truck body-in-white flexible welding production line according to claim 8 is characterized in that: The bottom of the third robot (9), the bottom of the fourth robot (10), the bottom of the fifth robot (11) and the bottom of the sixth robot (12) are all provided with a linear module (13).

10. The heavy truck body-in-white flexible welding production line according to claim 9, characterized in that: A safety grating is arranged around the conveyor line to ensure the safety of operators.

Images