A multi-type random switching flexible general assembly system for medium and large-sized passenger cars

Abstract

The present application relates to a kind of multi-vehicle random switching flexible total assembly system for medium and large-sized passenger cars, including assembly platform and upper piece area, the upper piece area of assembly platform two sides respectively stores the side wall of two sides of the same vehicle;Upper piece area includes upper piece track and storage track, storage track is located in the two sides of upper piece track, upper piece track is equipped with assembly sliding table and welding robot sliding table, storage track is equipped with clamp, mobile tooling table and traction dolly, traction dolly connects mobile tooling table, clamp is fixed on mobile tooling table and connects two-way pneumatic-electric switching component, clamp clamps side wall and keeps clamping state when clamping side wall.Compared with prior art, the present application has the advantages that the clamp is fixed on the mobile tooling table and connected with the two-way pneumatic-electric switching component, the clamp is provided with air supply and power, the power and control signal of the clamp are not interrupted during transportation, the clamp keeps clamping state, the position of the side wall does not change, and the accuracy of the side wall assembly position is ensured.

Description

Technical Field

[0001] This invention relates to automobile assembly technology, and more particularly to a flexible assembly system for random switching of multiple models for medium and large buses. Background Technology

[0002] Currently, many technologies have enabled efficient, high-precision, and flexible production with random switching between multiple vehicle models in the final assembly of passenger car body-in-white welding. However, the production of medium and large buses remains unexplored. Compared to the 1-3 ton weight of passenger car side panel fixtures, the 8-10 ton weight and significantly increased length and height of medium and large buses make high-speed random switching of side panel fixtures difficult. Currently, the switching of these overweight and oversized side panel fixtures is primarily done using rollers for transportation, which is slow and the fixtures lose stable control during transport, requiring repositioning at the production station. This severely reduces efficiency and assembly accuracy, resulting in a high failure rate. The large size and weight of medium and large bus side panels lead to high deformation rates. Unlike passenger cars, which cannot be robotically positioned at the previous assembly station, buses require manual assembly, resulting in low precision and high labor costs.

[0003] A search revealed that application publication number CN107671468A discloses a side panel clamp switching device for a flexible assembly system. Specifically, the assembly system includes assembly subsystems respectively arranged on both sides of the assembly platform. Each assembly subsystem includes: a first-layer positioning and conveying mechanism arranged at a first to third station, each station equipped with a high-speed roller bed and a flexible trolley. The body-in-white is connected to the high-speed roller bed via the flexible trolley. A second station also includes an assembly slide. The device comprises a first-layer and a second-layer assembly. However, this prior art is not suitable for the side panels of medium and large passenger vehicles, as the side panels are prone to deformation during transportation.

[0004] In summary, the technical problem that needs to be solved is how to design a flexible assembly system for random switching of multiple vehicle models that is suitable for the side panels of medium and large buses and has high positioning accuracy. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art, namely the difficulty in side panel positioning of medium and large buses, and to provide a flexible assembly system for random switching of multiple models for medium and large buses.

[0006] The objective of this invention can be achieved through the following technical solutions.

[0007] The side panels required for multiple vehicle models are fixed on different storage tracks by clamps, and the assembly slide is located inside one side of the assembly platform or docked with the storage track; a welding robot is installed on the welding robot slide.

[0008] As a preferred technical solution, the assembly platform includes a first frame and a docking structure. The first frame includes multiple first frame rods and multiple second frame rods, which are perpendicular to each other. Both ends of the first and second frame rods are fixed to the ground by first adjusting feet. The docking structure is installed on both sides near the assembly slide and mates with the interface on the assembly slide.

[0009] As a preferred technical solution, the upper track includes a track base, guide rails, a first rack, a first rack light shield, and a first baffle; the track base is fixed to the ground by a second adjusting foot; there are two guide rails installed symmetrically on the track base, the first rack is installed between the two guide rails, the first rack light shield is installed on the first rack, and the first baffle is installed on the outside of the guide rails.

[0010] As a preferred technical solution, the assembly slide includes a second frame, a first motor, a first transmission rod, a second transmission rod, a reversing assembly, and a straightening mechanism, wherein the first motor, the reversing assembly, the straightening mechanism, and the movable tooling table are located on the second frame;

[0011] The output end of the first motor is connected to one end of two first transmission rods extending in opposite directions. The other end of the first transmission rod is connected to one end of a second transmission rod via a universal joint. The other end of the second transmission rod is connected to one end of a reversing assembly. The other end of the reversing assembly is connected to a first gear. The first gear meshes with a first rack on the upper track. The straightening mechanism is in contact with the side wall.

[0012] As a preferred technical solution, the mobile tooling table includes a positioning platform and a maintenance platform. There are multiple positioning platforms, and a maintenance platform is installed between two adjacent positioning platforms. The fixture is fixed on the positioning platform.

[0013] As a preferred technical solution, locking mechanisms are installed on both sides of the assembly platform. The locking mechanism includes a housing and a locking hook, and the locking hook hooks onto the positioning platform.

[0014] As a preferred technical solution, the bidirectional pneumatic-electric switching assembly is installed on both sides of the clamp. Both sides of the bidirectional pneumatic-electric switching assembly have a pneumatic source interface and a power supply interface. The pneumatic source interface and power supply interface on one side are connected to the pneumatic source and power supply on the storage track, and the pneumatic source interface and power supply interface on the other side are connected to the pneumatic source and power supply on the upper track. At any given time, at least one side of the pneumatic source interface and power supply interface is in the ON state.

[0015] As a preferred technical solution, the storage track includes a base and a track assembly; the track assembly includes a track, a second rack, a sensor, and a second baffle; the track consists of two symmetrical tracks mounted on the base, the second rack is mounted on the inner side of the track, and the sensor is mounted on the outer side of the track via a sensor bracket;

[0016] The traction trolley includes a second motor and a second gear connected to the second motor. The second motor integrates an encoder, and the second gear meshes with a second rack. The movable tooling table is located on a track, and the height of the track is the same as the height of the assembly slide.

[0017] As a preferred technical solution, the upper track is also provided with a transition switching slide.

[0018] As a preferred technical solution, the system also includes an elevator; one or more of the storage tracks are installed on the elevator.

[0019] Compared with the prior art, the present invention has the following beneficial effects.

[0020] 1) The present invention completes the assembly of the side panel by transporting the assembly slide, and the welding robot slide follows the assembly slide to perform welding; the fixture is fixed on the mobile tooling table and connected to the bidirectional pneumatic-electric switching component to provide the fixture with air and electricity, so as to keep the power and control signals uninterrupted during the transportation of the fixture, keep the fixture in a clamped state, so that the position of the side panel does not change, and ensure the accuracy of the side panel assembly position.

[0021] 2) The assembly platform of this invention can connect with the assembly slide via a docking structure, ensuring that the assembly slide transports the side panel to the accurate assembly position, further guaranteeing the accuracy of the side panel assembly position. The gears on the assembly slide mesh with the racks on the upper track to achieve precise movement of the assembly slide, thereby driving the clamps to move precisely; the straightening mechanism on the assembly slide can support the side panel, ensuring that the large side panel does not deform.

[0022] 3) The positioning platform of this invention performs multi-point positioning of the fixture; the maintenance platform facilitates maintenance by maintenance personnel; when the moving tooling table moves to the assembly slide, the assembly slide locks the positioning platform with a locking hook to ensure that the two do not separate, thus ensuring the stability and accuracy of transportation.

[0023] 4) The bidirectional pneumatic-electric switching component of the present invention has at least one side of the air source interface and power source interface in the connected state at the same time, which can ensure that the clamp is always in the clamping state, prevent displacement or deformation during the transportation of large side panels, and ensure the positioning accuracy of large side panels.

[0024] 5) The track assembly of this invention is equipped with sensors, and the second motor integrates an encoder, enabling accurate and high-speed positioning. Lowering the height of the upper track ensures that the height of the storage track is the same as the height of the assembly slide, facilitating the transport of the side panels.

[0025] 6) The transition switching slide of this invention can be used to switch the fixtures of different vehicle models, realizing the rapid switching of side panels of multiple vehicle models; it has a wide range of applications and greatly improves vehicle assembly efficiency.

[0026] 7) The present invention sets up an elevator in the storage area to expand the storage capacity of the clamps and form a multi-model storage area; it can be used for the assembly of many different models. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the layout of the flexible assembly system of the present invention.

[0028] Figure 2 This is a top view of the assembly platform of the present invention.

[0029] Figure 3 This is a top view of the track of the present invention.

[0030] Figure 4 This is a top view of the storage track of the present invention.

[0031] Figure 5 This is a schematic diagram of the overall structure of the storage track of the present invention.

[0032] Figure 6 This is a top view of the assembly slide of the present invention.

[0033] Figure 7 This is a front view of the assembly slide of the present invention.

[0034] Figure 8 This is a schematic diagram of the locking mechanism of the present invention installed on the assembly platform.

[0035] Figure 9 This is a simplified structural diagram of the locking mechanism of the present invention.

[0036] Figure 10 This is a schematic diagram of the internal structure of the locking mechanism of the present invention.

[0037] Figure 11 This is a schematic diagram showing the locking mechanism of the present invention locking the positioning platform.

[0038] Figure 12 This is a schematic diagram of the overall structure of the mobile tooling table of the present invention.

[0039] Figure 13 This is a top view of the movable tooling table of the present invention.

[0040] Figure 14 This is a front view of the movable tooling table of the present invention.

[0041] Figure 15 This is a schematic diagram of the assembly slide of the present invention located on the upper track.

[0042] Figure 16 This is a schematic diagram of the bidirectional gas-electric switching component of the present invention.

[0043] Figure 17 This is a schematic diagram of the fixture of the present invention located on a movable tooling table.

[0044] The numbers in the diagram are as follows:

[0045] 1. Assembly platform; 10. First frame; 101. First frame rod; 102. Second frame rod; 11. Docking structure; 12. Locking mechanism; 120. Box body; 1201. Cylinder; 1202. Limiting block; 1203. Connecting rod; 1204. Fixing pin; 1205. Limiting plate; 121. Locking hook; 1210. Hook; 2. Upper part track; 20. Track base frame; 21. Guide rail; 22. First rack; 23. First rack light shield; 24. First baffle; 3. Storage track 30. Base; 310. Track; 311. Second rack; 312. Sensor; 313. Second baffle; 4. Assembly slide; 40. Second frame; 41. First motor; 42. First transmission rod; 43. Second transmission rod; 44. Reversing assembly; 45. Straightening mechanism; 46. First gear; 5. Welding robot slide; 60. Positioning platform; 61. Maintenance platform; 7. Traction trolley; 70. Second motor; 8. Transition slide; 9. Fixture; 90. Bidirectional pneumatic-electric switching assembly. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0047] Example 1

[0048] like Figure 1As shown, this embodiment provides a flexible assembly system for random switching of multiple bus models, including an assembly platform 1 and loading areas located on both sides of the assembly platform 1. The loading areas on both sides of the assembly platform 1 respectively store the side panels of the same bus model. The side panels are simultaneously transported from the loading areas on both sides to the assembly platform 1 for simultaneous assembly. The loading areas include loading rails 2 and storage rails 3, with storage rails 3 located on both sides of the loading rails 2. The loading rails 2 are equipped with an assembly slide 4, a welding robot slide 5, and a transition slide 8. The storage rails 3 are equipped with clamps 9, a movable tooling table, and a traction trolley 7. The traction trolley 7 is connected to the movable tooling table, and the clamps 9 are fixed to the movable tooling table. Side panels required for multiple bus models are fixed to different storage rails 3 by clamps 9.

[0049] like Figure 2 and Figure 15 As shown, the assembly platform 1 includes a first frame 10, a docking structure 11, and a locking mechanism 12. The vehicle floor is placed on the first frame 10. The first frame 10 includes multiple first frame rods 101 and multiple second frame rods 102, which are perpendicular to each other. Both ends of the first frame rods 101 and second frame rods 102 are fixed to the ground via first adjusting feet. The docking structure 11 is installed on both sides near the assembly slide 4. When the assembly slide 4 moves to both sides of the assembly platform 1, the interface on the assembly slide 4 engages with the docking structure 11, effectively positioning the assembly slide 4 and ensuring precise positioning of the side panel. After engagement, the vehicle floor and side panel are welded together. Figures 8-11As shown, the locking mechanism 12 is installed on both sides of the assembly platform 1, including a housing 120 and a locking hook 121. The locking hook 121 hooks onto the positioning platform 60 to further ensure that the position does not shift during side welding. A cylinder 1201 is installed inside the housing 120. A limit block 1202 is provided on the outer surface of the upper part of the housing 120. Multiple limit posts on the limit block 1202 can limit the positioning platform 60 in the X, Y, and Z directions. The output end of the cylinder 1201 is connected to the locking hook 121 through a connecting rod 1203. The movement trajectory of the connecting rod 1203 is limited by the oblong hole on the limit plate 1205. One end of the locking hook 121 is provided with a groove, and one side of the groove is inclined. When the positioning platform 60 moves to the vicinity of the assembly platform 1, the limit block 1202 on the locking mechanism 12 abuts against the side of the positioning platform 60, the cylinder 1201 is opened, and the end of the locking hook 121 with the groove extends out from inside the housing and abuts against the side of the positioning platform 60. The positioning platform 60 is equipped with a limiting wheel. The inclined surface on the groove pushes the limiting wheel towards the limiting block 1202 and applies clamping force, so that the positioning platform 60 is tightly clamped between the locking hook 121 and the limiting block 1202. In addition, after the locking hook 121 clamps the positioning platform 60, the position of the connecting rod 1203 can be fixed by the fixing pin 1204 to prevent the locking hook 121 from loosening and causing the position of the fixture 9 to change after the cylinder 1201 is accidentally cut off, which would affect the welding accuracy of the side panel. The other end of the locking hook 121 can also be equipped with a bent hook 1210, which hooks the positioning post of the positioning platform 60 to further ensure the accurate locking of the fixture 9, thereby ensuring the accurate position of the side panel.

[0050] like Figure 3 As shown, the upper track 2 includes a track base 20, guide rails 21, a first rack 22, a first rack light shield 23, and a first baffle 24. The track base 20 is fixed to the ground by a second adjustable foot. Two guide rails 21 are symmetrically installed on the track base 20. The first rack 22 is installed between the two guide rails 21, and the first rack light shield 23 is installed on the first rack 22. The first baffle 24 is installed on the outside of the guide rails 21. The first rack light shield 23 can block direct sunlight and reflective interference, prevent gear tooth surface aging, and does not affect the meshing movement of the gear rack. It can also prevent dust and foreign objects, ensuring the stability of precision transmission. The upper track 2 is relatively low to ensure that the height of its upper assembly slide 4 is the same as the height of the storage track 310.

[0051] like Figure 6 and Figure 7As shown, the assembly slide 4 includes a second frame 40, a first motor 41, a first transmission rod 42, a second transmission rod 43, a reversing assembly 44, and a straightening mechanism 45. The first motor 41, the reversing assembly 44, the straightening mechanism 45, and the movable tooling table are fixed on the second frame 40. The second frame 40 includes a horizontal frame rod and a vertical frame rod, with the horizontal frame rod parallel to the storage track 3. The output end of the first motor 41 is connected to one end of two first transmission rods 42 extending in opposite directions. The other end of the first transmission rods 42 is connected to one end of the second transmission rod 43 via a universal joint. The other end of the second transmission rod 43 is connected to one end of the reversing assembly 44. The other end of the reversing assembly 44 is connected to a first gear 46. The first gear 46 meshes with a first rack 22 on the upper track 2 to realize the movement of the assembly slide 4. The meshing displacement error of the first gear 46 and the first rack 22 is extremely small, and the motion response is sensitive and repeatable, ensuring the accuracy of the movement. The movement process of the assembly slide 4 is as follows: The first motor 41 is started, and its output shaft transmits motion to the first transmission rod 42 via a bevel gear set. The first transmission rod 42 rotates along its axis, and the other end of the first transmission rod 42 transmits motion to the second transmission rod 43 via a universal joint. The second transmission rod 43 rotates along its axis, and the other end of the second transmission rod 43 transmits motion to the reversing assembly 44 via a universal joint. The reversing assembly 44 contains a bevel gear that can change the motion along the axis of rotation parallel to the ground to that perpendicular to the ground. The axis of the first gear 46 is perpendicular to the ground, thus enabling the reversing assembly 44 to drive the first gear 46 to rotate, pushing the assembly slide 4 to move the upper part along the upper part track 2. When the clamp 9 is large, the guide groove on the straightening mechanism 45 cooperates with the guide wheel on the clamp 9 to support and guide the clamp 9, preventing deformation due to the large side panels of medium and large passenger vehicles.

[0052] like Figures 12-14 As shown, the mobile tooling table includes a positioning platform 60 and a maintenance platform 61. There are multiple positioning platforms 60, and a maintenance platform 61 is installed between two adjacent positioning platforms 60, as shown below. Figure 17 As shown, the clamp 9 is fixed on the positioning platform 60. The maintenance platform 61 allows maintenance personnel to stand and perform maintenance.

[0053] like Figure 16As shown, the bidirectional pneumatic-electric switching assembly 90 is installed on both sides of the clamp 9. The figure shows the base part of the clamp 9. The bidirectional pneumatic-electric switching assembly 90 has a pneumatic source interface and a power supply interface. The pneumatic source interface and power supply interface on one side are connected to the pneumatic source and power supply on the storage track 3, and the pneumatic source interface and power supply interface on the other side are connected to the pneumatic source and power supply on the upper track 2. At any given time, at least one side of the pneumatic source interface and power supply interface is in the on state. The power and air supply interfaces of the bidirectional pneumatic-electric switching component 90 on one side of the fixture 9 are connected to the power and air supply on the storage track 3. The sensors on the fixture 9 detect whether each gripper on the fixture 9 is fully open. If there are grippers that are not fully open, the grippers are opened by the cylinder. After confirming that all grippers are open, the robot grabs the side of the vehicle with both hands and puts it into the fixture 9 on the mobile tooling table. The cylinder drives all grippers to close and clamp the side. After the traction trolley 7 pushes the mobile tooling table carrying the fixture 9 and the side to the assembly slide 4, the air supply interface and power interface of the bidirectional pneumatic-electric switching component 90 on the other side of the fixture 9 are connected to the air and power supply on the upper part track 2. Then the power and air supply interfaces on one side of the fixture 9 that are connected to the power and air supply on the storage track 3 are disconnected. Since the air and power supply interfaces on at least one side of the fixture are connected at the same time, the fixture 9 can always be kept in a clamped state to prevent the side clamped on it from being inaccurately positioned due to the loosening of the fixture 9.

[0054] A welding robot is installed on the welding robot slide 5. After the assembly slide 4 is docked with the assembly platform 1, the welding robot slide 5 moves to one side of the assembly slide 4 to weld the side wall.

[0055] like Figure 4 and Figure 5 As shown, the storage track 3 includes a base 30 and a track 310 assembly; the track 310 assembly includes a track 310, a second rack 311, a sensor 312, and a second baffle 313; the track 310 consists of two symmetrical tracks mounted on the base 30, the second rack 311 is mounted on the inner side of the track 310, and the sensor 312 is mounted on the outer side of the track 310 via a sensor 312 bracket; the traction trolley 7 includes a second motor 70 and a second gear connected to the second motor 70, the second motor 70 integrating an encoder to ensure motion accuracy, and the second gear meshing with the second rack 311 to realize the movement of the traction trolley 7 on the storage track 3; the movable tooling table is located on the track 310, lowering the height of the upper track 2 so that the height of the storage track 3 is the same as the height of the assembly slide 4, facilitating the movement of the movable tooling table. The second baffle 313 is mounted on the outside of the second rack 311.

[0056] The transition switching slide 8 is used to switch between other types of fixtures 9 to meet the assembly needs of multiple vehicle models; the height of the transition switching slide 8 is the same as the height of the assembly slide 4.

[0057] Example 2

[0058] This embodiment provides a flexible assembly system for random switching of multiple bus models for medium and large buses. Unlike embodiment 1, the system also includes a lift, and one or more storage rails 3 are installed on the lift. This forms a multi-layer structure, further expanding the storage area without increasing the floor space, and adapting to the needs of rapid assembly of side panels for more bus models.

[0059] The working process of this invention is as follows:

[0060] A robot is positioned on one side of one of the storage tracks 3, located to the left of the upper track 2. The robot grips the side panel of the vehicle with both hands and places it into the fixture 9 of the mobile tooling table, where the fixture 9 clamps it in place. The assembly slide 4, the robot welding slide, and the transition slide 8 retract in one go until the transverse frame of the assembly slide 4 aligns with the storage track 3. The traction trolley 7 then pushes the mobile tooling table carrying the fixture 9 and the side panel onto the assembly slide 4. Finally, the air source interface and power interface of the bidirectional pneumatic-electric switching component 90 are switched to achieve the positioning and clamping of the side panel.

[0061] The assembly slide 4 transports the side panel to the assembly platform 1, and the welding robot slide 5 follows the assembly slide 4 to perform assembly welding.

[0062] The transition switching slide 8 docks with any of the storage tracks 3 in the storage area. A traction trolley 7 pushes a mobile fixture table carrying only clamps 9 onto the transition switching slide 8. The transition switching slide 8 then docks with a storage track 3 on one side, where a robot is located. The traction trolley 7 pushes the mobile fixture table onto this storage track 3, and the robot places the vehicle sidewall into the clamps 9 on the mobile fixture table, which then clamps it. The transition switching slide 8 then retracts.

[0063] After the welding of the assembly platform 1 is completed, the assembly slide 4 and the welding robot slide 5 are moved back. The assembly slide 4 is then connected to the left storage track 3 (a mobile fixture is placed on the storage track 3, and the fixture 9 on the mobile fixture has been clamped in the previous step). The empty fixture 9 after use is placed into the storage track 3 on the right side of the upper part track. The traction trolley 7 pushes the side and fixture 9 onto the assembly slide 4 and locks them in place. The next round of assembly begins.

[0064] The transition switching slide 8 connects with the storage track 3 on the right side of the upper track, where an empty fixture 9 is placed. The traction trolley 7 pushes the mobile tooling table carrying the empty fixture 9 onto the transition switching slide 8, and then moves it to the left storage track or is transported by the transition switching slide 8 to other storage tracks 3.

[0065] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-type random switching flexible total assembly system for medium and large-sized passenger cars, characterized in that, The utility model provides a kind of welding platform, including splicing platform (1) and the upper piece area located at the both sides of splicing platform (1), the upper piece area of the both sides of splicing platform (1) respectively stores the side wall of the same vehicle type both sides;The upper piece area includes upper piece track (2) and storage track (3), the storage track (3) is located in the both sides of upper piece track (2), the upper piece track (2) is equipped with splicing sliding table (4) and welding robot sliding table (5), the storage track (3) is equipped with clamp (9), mobile tooling and traction trolley (7), the traction trolley (7) is connected mobile tooling, the clamp (9) is fixed on mobile tooling and is connected two-way gas-electric switching component (90), the clamp (9) is clamped side wall and keeps clamping state; Multiple vehicle types required side wall is fixed on different storage track (3) by clamp (9), the splicing sliding table (4) can be butt-jointed with splicing platform (1);The splicing sliding table (4) located in one side of splicing platform (1) can also be butt-jointed with storage track (3);Welding robot is installed on the welding robot sliding table (5); The splicing sliding table (4) includes second frame (40), first motor (41), first transmission rod (42), second transmission rod (43), reversing component (44) and righting mechanism (45), the first motor (41), reversing component (44), righting mechanism (45) and mobile tooling are fixed on second frame (40);Righting mechanism (45) is equipped with guide slot, and the guide slot cooperates with the guide wheel on clamp 9; The output end of first motor (41) is connected with the one end of two first transmission rods (42) extending in opposite directions, the other end of first transmission rod (42) is connected with the one end of second transmission rod (43) through universal joint, the other end of second transmission rod (43) is connected with the one end of reversing component (44), the other end of reversing component (44) is connected with first gear (46), and first gear (46) is engaged with first rack (22) on upper piece track (2);Righting mechanism (45) is in contact with side wall.

2. The multi-type random switching flexible total assembly system for medium and large-sized buses according to claim 1, characterized in that, The splicing platform (1) includes first frame (10) and butt joint structure (11), the first frame (10) includes a plurality of first frame rods (101) and a plurality of second frame rods (102), the first frame rods (101) and the second frame rods (102) are perpendicular to each other, and the two ends of the first frame rods (101) and the second frame rods (102) are fixed to the ground through first adjusting foot; The butt joint structure (11) is installed on the both sides close to splicing sliding table (4) and cooperates with the interface on splicing sliding table (4).

3. The multi-type random switching flexible total assembly system for medium and large-sized buses according to claim 1, characterized in that, The upper piece track (2) comprises a track chassis (20), a guide rail (21), a first rack (22), a first rack light shield (23) and a first baffle (24); the track chassis (20) is fixed on the ground through a second adjusting foot; the guide rail (21) is symmetrical and installed on the track chassis (20), the first rack (22) is installed between the two guide rails (21), the first rack (22) is provided with the first rack light shield (23), and the first baffle (24) is installed outside the guide rail (21).

4. The multi-type random switching flexible total assembly system for medium and large-sized buses according to claim 1, characterized in that, The mobile tooling platform comprises positioning platforms (60) and a maintenance platform (61), the positioning platforms (60) are multiple, the maintenance platform (61) is installed between two adjacent positioning platforms (60), and the clamp (9) is fixed on the positioning platform (60).

5. The multi-type random switching flexible total assembly system for medium and large-sized buses according to claim 1, characterized in that, The combined platform (1) is provided with locking mechanisms (12) on both sides, the locking mechanism (12) comprises a box body (120) and a locking hook (121), and the locking hook (121) hooks the positioning platform (60).

6. The multi-type random switching flexible total assembly system for medium and large-sized buses according to claim 1, characterized in that, The bidirectional pneumatic and electric switching assembly (90) is installed on both sides of the clamp (9), the bidirectional pneumatic and electric switching assembly (90) is provided with a gas source interface and a power source interface on both sides, the gas source interface and the power source interface on one side are connected with the gas source and the power source on the storage track (3), the gas source interface and the power source interface on the other side are connected with the gas source and the power source on the upper piece track (2), and at least one side of the gas source interface and the power source interface is in a connected state at the same time.

7. The multi-type random switching flexible total assembly system for medium and large-sized buses according to claim 1, characterized in that, The storage track (3) comprises a base (30) and a track (310) assembly; the track (310) assembly comprises a track (310), a second rack (311), an inductor (312) and a second baffle (313); the track (310) is symmetrical and installed on the base (30), the second rack (311) is installed on the inner side of the track (310), the inductor (312) is installed on the outer side of the track (310) through an inductor (312) support; The traction trolley (7) comprises a second motor (70) and a second gear connected with the second motor (70), the second motor (70) is integrated with an encoder, and the second gear is engaged with the second rack (311); the mobile tooling platform is located on the track (310), and the height of the track (310) is the same as that of the combined sliding platform (4).

8. The multi-type random switching flexible total assembly system for medium and large-sized buses according to claim 1, characterized in that, The upper piece track (2) is further provided with a transition switching sliding platform (8).

9. The multi-type random switching flexible total assembly system for medium and large-sized buses according to claim 1, characterized in that, The system further comprises an elevator, and one or more storage tracks (3) are installed on the elevator. The upper piece track (2) is further provided with a transition switching sliding platform (8).

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