A track type flexible general assembly system for a welding production line

Abstract

The present application belongs to the automobile assembly technology field, and particularly relates to a welding production line track type flexible general assembly system, which comprises a combined assembly fixture positioning frame, a Y-direction pushing combined assembly trolley and an X-Y-direction switching trolley. The combined assembly fixture positioning frame comprises a plurality of positioning and clamping units, which are used for fixing and positioning a side wall fixture trolley. The Y-direction pushing combined assembly trolley is connected to the side of the combined assembly fixture positioning frame, and is used for transmitting the side wall fixture trolley. The X-Y-direction switching trolley is connected to the two ends of the Y-direction pushing combined assembly trolley, and is used for switching the side wall fixture trolleys of different vehicle models. Compared with the prior art, the present application solves the problem that the general assembly system in the prior art cannot meet the use of large vehicles. The present scheme realizes a general assembly system with a side wall fixture frame length of more than 5 meters, and basically meets the production and use requirements of existing medium and large MPV vehicle models.

Description

Technical Field

[0001] This invention belongs to the field of automotive assembly technology, specifically relating to a rail-type flexible assembly system for a welding production line. Background Technology

[0002] As a crucial station for ensuring the overall quality of vehicles in the welding workshop, the final assembly station on the welding production line demands increasingly higher stability and flexibility from its assembly system. With ordinary 5-seater vehicles no longer meeting the travel needs of families with multiple children, MPV sales are steadily increasing, and OEMs are investing more in mid-to-large-sized vehicles. Consequently, the mature assembly systems used for sedans are no longer sufficient for larger vehicles, making the development of large-size, high-quality, and highly flexible assembly systems an urgent task.

[0003] The prior art CN104801899A discloses a ground sliding flexible assembly system, including a vehicle body conveying system, a welding system, an assembly fixture, an assembly system, a fixture storage system, and a fixture switching system. The fixture storage system includes several parallel bidirectional slide rails, with storage positions for storing assembly fixtures formed on the bidirectional slide rails. The fixture switching system includes a left slide conveying rail and a right slide conveying rail led from both ends of the bidirectional slide rails to both sides of the assembly system, fixture conveying rails led from both sides of the assembly system to the left slide conveying rail and the right slide conveying rail respectively, a slide that can run on the left slide conveying rail and the right slide conveying rail, and a conveying mechanism that can pull the assembly fixtures located on the bidirectional slide rails and the fixture conveying rail. However, this solution only achieves bidirectional sliding and flexible switching of the clamp through bidirectional slide rails. However, due to the design limitations, the drive device of CN104801899A can only be placed at the end of the track. Therefore, its side frame can only be arranged inside the Y-axis lateral movement switching position. Thus, due to space limitations, the number of vehicle models that can be stored cannot be too large, or when multiple vehicle models need to be considered, the floor space is larger than that of the design of this invention. Summary of the Invention

[0004] The purpose of this invention is to provide a track-type flexible assembly system for welding production lines to solve at least one of the aforementioned problems, addressing the limitation of existing assembly systems in meeting the needs of large vehicle models. This solution achieves an assembly system with a side panel clamp frame exceeding 5 meters in length, basically meeting the production and usage requirements of existing medium and large MPV models.

[0005] The objective of this invention is achieved through the following technical solution: A flexible assembly system for a welding production line, used for the transfer of side clamp trolleys for different vehicle models, includes an assembly clamp positioning frame, a Y-axis propulsion assembly trolley, and an XY-axis switching trolley; The assembly fixture positioning frame includes several positioning and clamping units for fixing the positioning side fixture trolley; The Y-axis propulsion and assembly trolley is docked to the side of the assembly fixture positioning frame for transferring the side clamp trolley; the Y-axis propulsion and assembly trolley includes a Y-axis drive gear rack set and a first X-axis motion track, the side clamp trolley is slidably disposed on the first X-axis motion track, and the first X-axis motion track is connected to the Y-axis drive gear rack set through the first motion frame; The XY-direction switching trolley is docked at both ends of the Y-direction propulsion and assembly trolley and is used to switch the side clamp trolleys of different models. The XY-direction switching trolley includes several Y-direction switching drive gear rack sets and at least one second X-direction motion track. The side clamp trolleys of different models are slidably set on different Y-direction switching drive gear rack sets. The second X-direction motion track is connected to the Y-direction switching drive gear rack sets through a second motion frame.

[0006] Preferably, the assembly fixture positioning frame includes several side frames, and each side frame is provided with at least one positioning and clamping unit.

[0007] Preferably, the side frame has an L-shaped structure, with positioning and clamping units spaced apart on the vertical side of the side frame, and trolley support rollers provided on the horizontal side of the side frame. The side frames are arranged in pairs facing each other, and adjacent side frames on the same side are connected by reinforcing beams to form an integral frame.

[0008] Preferably, the Y-axis propulsion and assembly trolley further includes a Y-axis assembly drive motor, a Y-axis motion track, an X-axis positioning cylinder unit, and a first pneumatic-electric quick-connect unit; The Y-axis merging drive motor is mounted on the first motion frame, and the Y-axis merging drive motor is connected to the Y-axis drive gear rack assembly via a coupling; The Y-axis drive gear rack assembly includes a rack and a gear that mesh with each other, wherein the gear is connected to a coupling and the rack is arranged on a fixed platform or the ground; The Y-axis motion track is arranged on a fixed platform or the ground, and the first motion frame slides with the Y-axis motion track through a roller assembly; The X-axis positioning cylinder unit is mounted on the first motion frame and is used for X-axis positioning of the side clamp trolley. The first pneumatic quick-connect unit is mounted on the first moving frame and is connected to the Y-axis assembly drive motor, the X-axis positioning cylinder unit, and the side clamp trolley.

[0009] Preferably, the track-type flexible assembly system further includes a transition track; The transition track is connected between the first X-axis motion track of the Y-axis propulsion and assembly trolley and the second X-axis motion track of the XY-axis switching trolley, forming an X-axis transmission track.

[0010] Preferably, the XY-direction switching trolley further includes a Y-direction switching drive motor, a Y-direction switching motion track, and a second pneumatic-electric quick-connect unit; The Y-axis switching drive motor is mounted on the second motion frame, and the Y-axis switching drive motor is connected to the Y-axis switching drive gear rack set via a coupling; Each of the Y-axis switching drive gear rack assemblies includes a rack and a gear that mesh with each other, wherein the gear is connected to a coupling and the rack is arranged on a fixed platform or the ground; The Y-axis switching motion track is provided with several Y-axis switching drive gear rack sets. The Y-axis switching motion tracks are respectively arranged on a fixed platform or the ground. The second motion frame slides with the Y-axis switching motion track through a roller set. The second pneumatic quick-connect unit is mounted on the second motion frame and is connected to the Y-axis switching drive motor and the side clamp trolley.

[0011] Preferably, the XY-direction switching trolley further includes at least one X-direction drive motor and an X-direction switching trolley; The X-axis drive motor is mounted on the second motion frame, and a gear is connected to the output end of the X-axis drive motor; The X-axis switching trolley is connected to the X-axis drive motor through the meshing of the X-axis motion rack and gear; the X-axis switching trolley is slidably engaged with the second X-axis motion track through the X-axis sliding roller assembly. Each X-axis drive motor drives an independent X-axis switching trolley to slide on its respective second X-axis motion track.

[0012] Preferably, the X-axis switching trolley includes an X-axis drive telescopic cylinder and an oil injection block; The X-axis drive telescopic cylinder is installed on the surface of the X-axis switching trolley and is used for lifting and lowering the side clamp trolley. The oil injection block is disposed on the surface of the X-axis switching trolley, and the oil injection block is connected to the X-axis motion rack through an internal lubricating oil channel.

[0013] Preferably, the track-type flexible assembly system also includes a storage space for side clamps; The side clamp storage location is connected to the side of the XY-direction switching trolley; The side clamp storage compartment is equipped with several locking cylinder units for locking the side clamp trolleys of different vehicle models.

[0014] Preferably, the track-type flexible assembly system further includes an outer switching track; The outer switching track is connected between adjacent XY-direction switching trolleys and is used for switching and reversing the side clamp trolleys of different models within adjacent XY-direction switching trolleys.

[0015] Compared with the prior art, the present invention has the following beneficial effects: I. Meeting the Production Needs of Larger Vehicles: Traditional passenger car assembly systems require lengthening their assembly and propulsion mechanisms when expanded and modified into larger vehicle assembly systems. However, regardless of whether it's a turntable-type or open-gate assembly system, the original design suffers from significant frame deformation after being lengthened by nearly 1 meter. To meet the precision requirements for this deformation, radical structural reinforcement is necessary. Compared to traditional passenger car assembly systems, this invention can adapt to the dimensions of the side clamps for larger vehicles. After length adjustments, only the track support components need to be adjusted to maintain overall frame strength. This allows for convenient modification and adaptation to meet the needs of different vehicle sizes. Compared to CN104801899A, the horizontal sliding trolley designed in this invention uses a telescopic pin (X-direction drive telescopic cylinder) for locking / unlocking. When the telescopic pin is in the retracted state, the telescopic trolley can move freely under the side clamp frame without being affected by the drive device. The left and right sides of the XY-direction switching trolley (corresponding to the left slide table conveyor rail and right slide table conveyor rail clamp switching system in CN104801899A) can both be used as storage positions.

[0016] II. Simple and stable structure, convenient maintenance: This invention utilizes a mature C-shaped track and roller assembly as the motion transmission component, and a gear and rack as the driving power output, resulting in a simple yet stable and reliable structure. The system is designed with automatic lubrication (automatic lubrication injector) and manual centralized lubrication (oil injection block), making lubrication point maintenance simple and convenient.

[0017] III. High integration of drive systems and significant cost advantages: Compared to traditional turntable-type flexible assembly systems, this invention requires two fewer motors for an 8-model configuration (the turntable-type assembly system requires 16 motors for 8 models, while this system only requires 14). Furthermore, the precision control required during transportation is not as stringent as other assembly methods, making this invention more economical in terms of processing costs. Unlike existing technologies such as CN104801899A, the special design of the X-axis switching trolley in this invention allows it to freely move under the side frame. Its traction point is unaffected by the structure and can be freely defined according to position changes, thus the storage location (inner or outer) is unrestricted, resulting in a smaller footprint for the same number of models.

[0018] IV. High Flexibility: Compared to traditional open-gate assembly systems on the market, this system eliminates waiting time and switching losses when changing vehicle models. Based on the set vehicle configuration ratio, the system can automatically adjust vehicle allocation and switch models seamlessly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a track-mounted flexible assembly system; Figure 2 A schematic diagram of the positioning frame for the assembly fixture; Figure 3 This is a structural schematic diagram of the Y-axis propulsion assembly trolley; Figure 4 This is a schematic diagram of the XY-axis switching vehicle. Figure 5 This is a schematic diagram of the X-axis switching vehicle. Figure 6 This is a structural schematic diagram of the side clamp trolley; Figure 7 This is a schematic diagram of the roller assembly (a) and track (b) used in the track-type flexible assembly system; In the picture: 1-Assembly fixture positioning frame; 1-1-Positioning clamping unit; 1-2-Trolley support rollers; 2-Y-axis propulsion and assembly trolley; 2-1-Y-axis assembly drive motor; 2-2-Y-axis drive gear and rack assembly; 2-3-Y-axis motion track; 2-4-X-axis positioning cylinder unit; 2-5-First pneumatic-electric quick-connect unit; 2-6-First X-axis motion track; 3-Transition orbit; 4-XY axis switching trolley; 4-1-Y axis switching drive motor; 4-2-X axis drive motor; 4-3-Y axis switching drive gear rack assembly; 4-4-Y axis switching motion track; 4-5-Second X axis motion track; 4-6-Second pneumatic quick-connect unit; 4-7-X axis switching trolley; 4-7-1-X axis drive telescopic cylinder; 4-7-2-X axis sliding roller assembly seat; 4-7-3-X axis motion rack; 4-7-4-Oil injection block; 4-8-Automatic lubrication injector; 5-Side clamp storage location; 6-Outer track switching; 7-Side clamp trolley; 7-1-Side clamp unit trolley assembly; 7-2-Side clamp frame. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] Example A flexible assembly system for a welding production line, such as Figure 1-7 As shown, the side clamp trolley 7 used for the transfer of different vehicle models includes a merging clamp positioning frame 1, a Y-axis pushing merging trolley 2, and an XY-axis switching trolley 4; The assembly fixture positioning frame 1 includes several positioning and clamping units 1-1 for fixing the positioning side clamp trolley 7; The Y-axis propulsion and assembly trolley 2 is docked to the side of the assembly fixture positioning frame and is used to transfer the side clamp trolley 7. The Y-axis propulsion and assembly trolley 2 includes a Y-axis drive gear rack set 2-2 and a first X-axis motion track 2-6. The side clamp trolley 7 is slidably disposed on the first X-axis motion track 2-6. The first X-axis motion track 2-6 is connected to the Y-axis drive gear rack set 2-2 through the first motion frame. The XY-direction switching trolley 4 is connected to both ends of the Y-direction propulsion and assembly trolley 2 and is used to switch the side clamp trolley 7 of different models. The XY-direction switching trolley 4 includes several Y-direction switching drive gear rack sets 4-3 and at least one second X-direction motion track 4-5. The side clamp trolley 7 of different models is slidably set on different Y-direction switching drive gear rack sets 4-3. The second X-direction motion track 4-5 is connected to the Y-direction switching drive gear rack set 4-3 through a second motion frame.

[0022] More specifically, in this embodiment: The track-type flexible assembly system mainly consists of the following components: 1. Assembly fixture positioning frame; 2. Y-axis propulsion assembly trolley; 3. Transition track; 4. XY-axis switching trolley; 5. Side fixture storage space; 6. Outer switching track; 7. Side fixture trolley.

[0023] The side clamping trolley 7 is the main clamp for vehicle body positioning. It consists of a side clamping frame 7-2 and a side clamping unit trolley assembly 7-1 that supports the side clamping frame 7-2. The side clamping frame 7-2 is primarily used for clamping workpieces (designed according to different vehicle models), and the side clamping unit trolley assembly 7-1 is a sliding component (such as a slider) that facilitates the sliding of the side clamping frame 7-2. Figure 6 As shown. The side clamp trolley 7 is configured and used according to the production needs of different vehicle models.

[0024] The assembly clamp positioning frame 1 undertakes the positioning function of the side clamp frame 7-2, such as Figure 2As shown, the single-side frame is clamped by four 80mm diameter high-strength clamping cylinders as positioning and clamping units 1-1, which hold the side frame clamp 7-2 in place. Its structural stability determines the overall quality of the vehicle assembly. The Y-axis propulsion assembly trolley 2 functions to advance the side frame clamp trolley 7 from the docking position of the second X-axis movement track 4-5 to the assembly position (at the assembly clamp positioning frame 1). Simultaneously, its X-axis positioning cylinder unit 2-4 provides positioning for the side frame clamp 7-2 in the X-axis direction. The transition track 3 connects the XY-axis switching trolley 4 and the Y-axis propulsion assembly trolley 2, forming a complete X-axis transmission track. The XY-axis switching trolley 4 is the main body for switching between different vehicle models' side frame clamps 7-2. It integrates X and Y-axis driving capabilities and serves as the power output source for the side frame clamp trolley 7 to move in all directions. The side clamp storage space 5 is equipped with a locking cylinder unit to fix the side clamp trolley 7 in the storage space. It also contains a sensor assembly for identifying the vehicle model corresponding to the side clamp frame 7-2. This allows for real-time feedback of the position of all vehicle models through vehicle model recognition. Specifically, the sensor assembly consists of five proximity sensors. Different vehicle models are identified by combining any two sensors (e.g., sensors 1+2 identify vehicle model A, 1+3 identify vehicle model B, and so on). The specific placement of the sensors is determined by the vehicle model structure, and they are placed in positions that can distinguish different vehicle models. The side clamp storage space 5 is typically located on the side of the XY-direction switching trolley 4. The outer switching track 6 is the transmission channel for switching the side frame trolleys left and right during flexible multi-vehicle switching. It is typically located between adjacent XY-direction switching trolleys 4.

[0025] The aforementioned assembly fixture positioning frame 1 includes two pairs of oppositely arranged side frames. Each side is designed with four positioning and clamping units 1-1 for fixing and positioning the side frame fixture 7-2. The side frames are also equipped with trolley support rollers 1-2, which cooperate with the side clamping unit trolley assembly 7-1 of the side clamping trolley 7. The two side frames on the left and right sides are connected by two reinforcing crossbeams, which connect the two sides to form an integral frame, ensuring the rigid connection of the structure itself. This ensures that the final repeatability of the side clamp meets the design requirement of ±0.1mm.

[0026] The aforementioned Y-axis propulsion assembly trolley 2 is primarily powered by a Y-axis assembly drive motor 2-1. The output of this motor, via universal couplings on both sides, drives the gears in the Y-axis drive gear and rack sets 2-2 located on both sides to move along their respective racks. The racks are positioned on the ground below the corresponding gears and can also be mounted on devices such as telescopic cylinders for height adjustment. Furthermore, the Y-axis propulsion assembly trolley 2 includes a Y-axis motion track 2-3 (C-shaped track) corresponding to the Y-axis drive gear and rack set 2-2. The overall motion frame of the Y-axis propulsion assembly trolley 2 is equipped with four roller sets that move within the C-shaped track grooves installed on the ground. Simultaneously, two C-shaped tracks are installed above this motion frame as the first X-axis motion track 2-6 for the transfer of the side clamp trolley 7. In addition, the X-axis positioning cylinder unit 2-4 on the motion frame can position the side clamp trolley 7; the first pneumatic quick-connect unit 2-5 on the motion frame provides air supply and valve island communication for the valve island on the side clamp trolley 7.

[0027] The aforementioned transition track 3 consists of 3 sets of fixed supports supporting 2 C-shaped tracks for the movement of the side clamp trolley 7 and 4 running tracks for the X-direction switching trolley 4-7.

[0028] The Y-axis movement principle of the XY-axis switching trolley 4 is similar to that of the Y-axis propulsion and assembly trolley 2, including the Y-axis switching drive motor 4-1, the Y-axis switching drive gear rack set 4-3, and the Y-axis switching motion track 4-4. However, the stroke and stopping positions are increased, and multiple buffer positions need to be connected, that is, multiple Y-axis switching drive gear rack sets 4-3 and Y-axis switching motion tracks 4-4 are arranged. The X-direction function of the XY-direction switching trolley 4 is driven by two X-direction drive motors 4-2, which respectively drive two X-direction switching trolleys 4-7 to reciprocate within the second X-direction motion track 4-5. The two gears used to transmit the rotational driving force provided by the X-direction drive motors 4-2 are fixed to the motion frame of the XY-direction switching trolley 4 by two bearing seats. The X-direction motion rack 4-7-3 meshing with the gears is hidden at the bottom of the X-direction switching trolley 4-7 (the gears and racks form the Y-direction switching drive gear rack set 4-3). In addition, X-direction sliding roller sets 4-7-2 are respectively provided on both sides of the X-direction switching trolley 4-7, which are slidably engaged and confined within the C-shaped track of the second X-direction motion track 4-5. Since the X-axis drive motor 4-2 in this embodiment is located in the middle of the second X-axis motion track 4-5, the single X-axis stroke of a single X-axis drive motor 4-2 can only be half the length of the XY-axis switching trolley 4. When a complete X-axis motion switch of the vehicle model needs to be completed, two sets of X-axis switching trolleys 4-7 need to be alternately connected in sequence. This is why this solution only requires two sets of X-axis trolleys to meet the flexible switching cycle. In addition to the above, the top surface of the X-axis switching trolley 4-7 is also equipped with an X-axis drive telescopic cylinder 4-7-1 and an oil injection block 4-7-4. The X-axis drive telescopic cylinder 4-7-1 can realize the raising and lowering of the side clamp trolley 7, while the oil injection block 4-7-4 is used to realize the manual centralized oil injection (periodic maintenance oil injection). The motion frame of the XY-axis switching trolley 4 is also equipped with a second pneumatic quick-connect unit 4-6 to provide air source and valve island communication for the valve island on the side clamp trolley 7. Furthermore, to achieve the automatic lubrication function of the structure, the XY-direction switching trolley 4 in this embodiment of the solution is further integrated with an automatic lubrication injector 4-8 (a commercially available product), which lubricates the gears in the Y-direction switching drive gear rack group 4-3; specifically, the automatic lubrication injector 4-8 is installed on the bracket of the second X-direction motion track 4-5 and is set downwards, and the automatic lubrication injector 4-8 is electrically driven to quantitatively compress the oil pack (the oil pack is replaced periodically) and quantitatively squeeze the lubricating oil to the lubrication part.

[0029] This invention utilizes simple and reliable mechanical principles to form a complete assembly and switching system. It incorporates a motion principle involving roller sets and C-shaped tracks, limiting the movement of each sliding component to two directions, ensuring it operates only in the designed directions. Simultaneously, the linear transmission principle of gears and racks is the most stable, reliable, and precise linear drive principle, guaranteeing the precision design requirements of this assembly system. The entire system can be further controlled by an externally connected PLC, with each location receiving real-time, unified feedback of vehicle model signal positions. This allows the PLC to calculate the optimal switching route and perform intelligent scheduling, ensuring flexible and lossless switching.

[0030] The specific usage method of this track-type flexible assembly system is as follows: Reference Figures 1 to 7 This illustrates the specific structure of an embodiment of the present invention. The following will describe in detail the usage of each element of the present invention.

[0031] The working principle of this technical solution is as follows: In the initial state, the A model side panel clamp frame 7-2 is located on the Y-direction advancing assembly trolley 2 and is advanced to the assembly clamp positioning frame 1, where it is locked and welded by the positioning clamping unit 1-1. The BH model side panel clamp frame 7-2 is located in the side panel clamp storage space 5. When the system identifies the next production model in advance, the final assembly system begins to prepare for the model switch.

[0032] (1) If the empty buffer position is on the left side of the system (left side of the assembly fixture positioning frame 1) and the next production model is on the right side of the system (right side of the assembly fixture positioning frame 1): then the right XY switching trolley 4 will move to the docking position of the side fixture storage space 5 of the corresponding model, and the X switching trolley 4-7 will pull the side fixture frame 7-2 out onto the XY switching trolley 4 and run to the docking position of the transition track 3 (right side) to wait. After the production of model A is completed, the assembly fixture positioning frame 1 is unlocked, and the Y-direction advancing assembly trolley 2 takes the side fixture A out to the docking position of the transition track 3 (left side). The X switching trolley 4-7 on the left XY switching trolley 4 extends to pull the side fixture A out onto the left XY switching trolley 4 and sends it to the corresponding side fixture storage space 5. At the same time, the X-axis switching trolley 4-7 on the right pushes the new side clamp frame 7-2 onto the Y-axis advancing and assembling trolley 2, and then pushes it onto the assembling clamp positioning frame 1 for locking and welding, thus completing one vehicle model switching action.

[0033] (2) If the empty buffer position is on the left side of one side of the system, the next production model is also on the left side of one side of the system: the left XY switching trolley 4 transports the side clamp frame 7-2 of the next production model to the docking position of the outer switching track 6 to wait, while the right XY switching trolley 4 moves directly to the docking position of the outer switching track 6, and the left X switching trolley 4-7 pulls the next production side frame onto the outer switching track 6. The right XY switching trolley 4 transports the side clamp frame 7-2 of the next production model to the right side in the opposite steps, and the right XY switching trolley 4 transports the side frame to the docking position of the transition track 3 to wait (that is, the side clamp frame 7-2 located on the same side is transferred to the opposite side through the outer switching track 6 to achieve process interleaving and facilitate shortening the overall process time). The same steps as in (1) are then performed to complete the switching action.

[0034] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A rail-type flexible assembly system for a welding production line, used for the transfer of side panel clamp trolleys (7) for different vehicle models, characterized in that, It includes a merging fixture positioning frame (1), a Y-axis merging trolley (2), and an XY-axis switching trolley (4); The assembly fixture positioning frame (1) includes several positioning and clamping units (1-1) for fixing the positioning side clamp trolley (7). The Y-axis propulsion assembly trolley (2) is docked to the side of the assembly fixture positioning frame (1) and is used to transfer the side clamp trolley (7); the Y-axis propulsion assembly trolley (2) includes a Y-axis drive gear rack set (2-2) and a first X-axis motion track (2-6); the side clamp trolley (7) is slidably disposed on the first X-axis motion track (2-6); the first X-axis motion track (2-6) is connected to the Y-axis drive gear rack set (2-2) through the first motion frame; The XY-direction switching trolley (4) is connected to both ends of the Y-direction propulsion and assembly trolley (2) and is used to switch the side clamp trolley (7) of different models. The XY-direction switching trolley (4) includes several Y-direction switching drive gear rack sets (4-3) and at least one second X-direction motion track (4-5). The side clamp trolley (7) of different models is slidably set on different Y-direction switching drive gear rack sets (4-3). The second X-direction motion track (4-5) is connected to the Y-direction switching drive gear rack set (4-3) through the second motion frame.

2. The flexible assembly system for a welding production line according to claim 1, characterized in that, The assembly fixture positioning frame (1) includes several side frames, and each side frame is provided with at least one positioning and clamping unit (1-1).

3. The flexible assembly system for a welding production line according to claim 2, characterized in that, The side frame has an L-shaped structure, with positioning and clamping units (1-1) spaced apart on the vertical side of the side frame, and trolley support rollers (1-2) on the horizontal side of the side frame. The side frames are arranged in pairs facing each other, and adjacent side frames on the same side are connected by reinforcing beams to form an integral frame.

4. The flexible assembly system for a welding production line according to claim 1, characterized in that, The Y-axis propulsion and assembly trolley (2) also includes a Y-axis assembly drive motor (2-1), a Y-axis motion track (2-3), an X-axis positioning cylinder unit (2-4), and a first pneumatic-electric quick-connect unit (2-5). The Y-axis merging drive motor (2-1) is mounted on the first motion frame, and the Y-axis merging drive motor (2-1) is connected to the Y-axis drive gear rack group (2-2) through a coupling; The Y-axis drive gear rack assembly (2-2) includes a rack and a gear that mesh with each other, wherein the gear is connected to a coupling and the rack is arranged on a fixed platform or the ground; The Y-axis motion track (2-3) is arranged on a fixed platform or the ground, and the first motion frame slides with the Y-axis motion track (2-3) through a roller assembly; The X-axis positioning cylinder unit (2-4) is mounted on the first motion frame and is used for X-axis positioning side clamp trolley (7). The first pneumatic quick-connect unit (2-5) is installed on the first moving frame and is connected to the Y-axis assembly drive motor (2-1), the X-axis positioning cylinder unit (2-4), and the side clamp trolley (7).

5. The flexible assembly system for a welding production line according to claim 1, characterized in that, The aforementioned track-type flexible assembly system also includes a transition track (3); The transition track (3) is connected between the first X-direction motion track (2-6) of the Y-direction propulsion and assembly trolley (2) and the second X-direction motion track (4-5) of the XY-direction switching trolley (4), forming an X-direction transmission track.

6. The flexible assembly system for a welding production line according to claim 1, characterized in that, The XY switching trolley (4) also includes a Y-axis switching drive motor (4-1), a Y-axis switching motion track (4-4), and a second pneumatic-electric quick-connect unit (4-6). The Y-axis switching drive motor (4-1) is mounted on the second motion frame, and the Y-axis switching drive motor (4-1) is connected to the Y-axis switching drive gear rack set (4-3) through a coupling; Each of the Y-axis switching drive gear rack assembly (4-3) includes a rack and a gear meshing with each other, wherein the gear is connected to a coupling and the rack is arranged on a fixed platform or the ground; The Y-axis switching motion track (4-4) has several corresponding to the Y-axis switching drive gear rack group (4-3). The Y-axis switching motion track (4-4) is arranged on a fixed platform or the ground. The second motion frame slides with the Y-axis switching motion track (4-4) through a roller group. The second pneumatic quick-connect unit (4-6) is mounted on the second motion frame and is connected to the Y-axis switching drive motor (4-1) and the side clamp trolley (7).

7. The flexible assembly system for a welding production line according to claim 1, characterized in that, The XY switching trolley (4) further includes at least one X-axis drive motor (4-2) and an X-axis switching trolley (4-7). The X-axis drive motor (4-2) is mounted on the second motion frame, and the output end of the X-axis drive motor (4-2) is connected to a gear; The X-axis switching trolley (4-7) is connected to the X-axis drive motor (4-2) through the meshing of the X-axis motion rack (4-7-3) and gear; the X-axis switching trolley (4-7) is slidably engaged with the second X-axis motion track (4-5) through the X-axis sliding roller assembly (4-7-2); Each X-axis drive motor (4-2) drives an independent X-axis switching trolley (4-7) to slide on its respective second X-axis motion track (4-5).

8. The flexible assembly system for a welding production line according to claim 7, characterized in that, The X-direction switching trolley (4-7) includes an X-direction drive telescopic cylinder (4-7-1) and an oil injection block (4-7-4). The X-direction drive telescopic cylinder (4-7-1) is set on the surface of the X-direction switching trolley (4-7) and is used for lifting and lowering the side clamp trolley (7); The oil injection block (4-7-4) is disposed on the surface of the X-direction switching trolley (4-7), and the oil injection block (4-7-4) is connected to the X-direction motion rack (4-7-3) through the internal lubricating oil channel.

9. The flexible assembly system for a welding production line according to claim 1, characterized in that, The track-type flexible assembly system also includes a side clamp storage space (5); The side clamp storage space (5) is connected to the side of the XY-direction switching trolley (4); The side clamp storage compartment (5) is equipped with several locking cylinder units for locking the side clamp trolleys (7) of different vehicle models.

10. A flexible assembly system for a welding production line according to claim 1, characterized in that, The aforementioned track-type flexible assembly system also includes an outer switching track (6). The outer switching track (6) is connected between adjacent XY-direction switching trolleys (4) for switching and reversing the side clamp trolleys (7) of different models within adjacent XY-direction switching trolleys (4).

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