assembly line

Abstract

The present invention provides an assembly line for assembling vehicles, comprising: a conveying device for conveying a vehicle frame, the conveying device having a loading position, a first assembly position, a second assembly position, and an unloading position; a loading device for conveying the vehicle frame to the conveying device when the conveying device moves to the loading position; a first assembly device spaced apart from the loading device, the first assembly device for assembling and conveying a first wheel hub assembly of the vehicle; a second assembly device disposed on a side of the first assembly device away from the loading device, the second assembly device for assembling and conveying a second wheel hub assembly of the vehicle; and a unloading device for transferring the vehicle frame from the conveying device when the conveying device moves to the unloading position. The assembly line provided by the present invention can solve the technical problem of low vehicle assembly efficiency in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle processing, and in particular to an assembly production line. Background Art

[0002] At present, in the production of electric motorcycles, the front and rear wheel assembly lines mostly use a combination of tire installation equipment, inflation equipment, flip lines and final assembly lines. The assembly and rotation process of the frame, tires, motors, front forks and wheels are carried out through manual handling and assembly.

[0003] This assembly and production method presents the following problems: low manual labor efficiency, with a typical production cycle of 60 to 80 seconds per vehicle; the need for manual installation and rotation necessitates a large number of workers on the production line; and the frame, rear wheel (including motor), and front fork assembly all weigh over 10kg, making manual movement difficult. Summary of the Invention

[0004] The main purpose of the present invention is to provide an assembly production line to solve the technical problem of low vehicle assembly efficiency in the prior art.

[0005] In order to achieve the above-mentioned objectives, the present invention provides an assembly production line, which is used to assemble vehicles, and the assembly production line includes: a conveying device, which is used to convey the frame of the vehicle, and the conveying device has a loading position, a first assembly position, a second assembly position and an unloading position; a loading device, which is used to transport the frame of the vehicle to the conveying device when the conveying device moves to the loading position; a first assembling device, which is arranged at a distance from the loading device, and the first assembly device is used to assemble and transport a first wheel hub assembly of the vehicle; when the conveying device moves to the first assembly position, the first assembly device transports the first wheel hub assembly of the vehicle to the conveying device; a second assembly device, which is arranged on a side of the first assembly device away from the loading device, and the second assembly device is used to assemble and transport the second wheel hub assembly of the vehicle; when the conveying device moves to the second assembly position, the second assembly device transports the second wheel hub assembly of the vehicle to the conveying device; an unloading device, which is arranged on a side of the second assembly device away from the first assembly device, and when the conveying device moves to the unloading position, the unloading device is used to transfer the frame of the vehicle on the conveying device.

[0006] Furthermore, the assembly production line also includes: a conveying rail, on which the conveying device is movably arranged so that the conveying device can move to a loading position, a first assembly position, a second assembly position and an unloading position; the loading device, the first assembly device, the second assembly device and the unloading device are all arranged on the conveying rail.

[0007] Furthermore, the conveying guide rail is a circular track, so that the conveying device moves from the unloading position to the loading position.

[0008] Furthermore, the first assembling device includes: a first assembling mechanism, and the first assembling mechanism is used to assemble the first wheel hub of the vehicle and the hard brake disc of the vehicle together.

[0009] Furthermore, the first assembly device also includes: a first transfer mechanism, which is used to transfer the first wheel hub of the vehicle; a first inflation mechanism, which is spaced apart from the first assembly mechanism, and the first transfer mechanism is used to transfer the first wheel hub of the vehicle on the first assembly mechanism to the first inflation mechanism, so that the first inflation mechanism inflates the first wheel hub of the vehicle.

[0010] Furthermore, the first assembly device also includes: a front fork bowl pulling machine, which is spaced apart from the first inflation mechanism, and the first transfer mechanism is used to transfer the first wheel hub on the first inflation mechanism to the front fork bowl pulling machine, so that the front fork bowl pulling machine assembles the first wheel hub of the vehicle with the front fork of the vehicle to form the first wheel hub assembly of the vehicle.

[0011] Furthermore, the second assembly device includes: a second inflation mechanism, which is used to inflate the second wheel hub of the vehicle.

[0012] Furthermore, the second assembly device also includes: a second transfer mechanism, which is used to transfer the second wheel hub of the vehicle; a second conveying mechanism, which is spaced apart from the second inflation mechanism, and the second transfer mechanism is used to transfer the second wheel hub on the second inflation mechanism to the second conveying mechanism, so as to convey the second wheel hub assembly of the vehicle to the conveying device through the second conveying mechanism.

[0013] Furthermore, the second conveying mechanism includes a conveying part and a stop part, the stop part is movably arranged on the conveying part, and the stop part has a stop position and an avoidance position; when the stop part is in the stop position, the stop part abuts against the second hub on the conveying part to limit the movement of the second hub; when the stop part is in the avoidance position, the stop part avoids the second hub on the conveying part so that the conveying part conveys the second hub.

[0014] Furthermore, the assembly production line also includes a positioning pallet, which is used to position the vehicle frame; the conveying device includes a conveying body, a driving mechanism and a detection mechanism, and the driving mechanism and the detection mechanism are both arranged on the conveying body; the positioning pallet can be movably arranged on the conveying body, and when the detection mechanism detects that the conveying device moves to the unloading position, the driving mechanism drives the positioning pallet to move to at least part of the unloading device, so as to transfer the positioning pallet through at least part of the unloading device.

[0015] Furthermore, the unloading device includes a third conveying mechanism and a fourth conveying mechanism, and the output end of the third conveying mechanism is spaced apart from the input end of the fourth conveying mechanism; when the conveying device moves to the unloading position, the conveying device is located at the interval between the third conveying mechanism and the fourth conveying mechanism, so that after the conveying device conveys the positioning pallet with the frame to the fourth conveying mechanism, the third conveying mechanism conveys the positioning pallet to the conveying device.

[0016] Furthermore, the assembly production line also includes a recycling mechanism, the input end of the recycling mechanism is connected to the fourth conveying mechanism, and the output end of the recycling mechanism is connected to the third conveying mechanism, so that the empty pallets on the third conveying mechanism can be recovered and conveyed to the fourth conveying mechanism through the recycling mechanism.

[0017] Furthermore, the third conveying mechanism includes: a support frame; a lifting platform, which is liftably arranged on the support frame so that the lifting platform can move to a first lifting position or a second lifting position; a cache component, which is arranged on the support frame, and the cache component includes a tray driving mechanism and a cache platform, at least part of the tray driving mechanism is movably arranged on the cache platform so that the tray driving mechanism drives the positioning tray to move; wherein, when the lifting platform moves to the first lifting position, the lifting platform is used to receive the positioning tray transmitted by the recycling mechanism; when the lifting platform moves to the second lifting position, the tray driving mechanism transfers the positioning tray on the lifting platform to the cache platform.

[0018] By applying the technical solution of the present invention, when assembling a vehicle on the assembly line, the conveyor device first moves to the loading position so that the loading device can transport the vehicle frame to the conveyor device. Subsequently, the transport device carries the frame and moves to the first assembly position so that the first assembly device can transport the assembled first wheel hub assembly of the vehicle to the conveyor device, so that the staff can install the first wheel hub assembly on the frame of the transport device. Next, the transport device carries the frame with the first wheel hub assembly installed and moves to the second assembly position so that the second assembly device can transport the assembled second wheel hub assembly of the vehicle to the conveyor device, so that the staff can install the second wheel hub assembly on the frame. At this point, the assembly of the frame is completed. Next, the transport device carries the frame with the first wheel hub assembly and the second wheel hub assembly installed and moves to the unloading position so that the assembled vehicle frame on the conveyor device can be transferred through the unloading device. The above-described working process is the vehicle assembly process. The vehicle frame is transported by a conveying device and moved to a loading position, a first assembly position, a second assembly position, and an unloading position. This facilitates operation by workers and eliminates the need for manual handling of the vehicle frame for assembly, thus avoiding the time-consuming and labor-intensive manual installation process. Therefore, the technical solution provided by the present invention can solve the technical problem of low vehicle assembly production efficiency in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 A schematic structural diagram of an assembly production line provided according to an embodiment of the present invention is shown;

[0021] Figure 2 A schematic structural diagram of a loading device according to an embodiment of the present invention is shown;

[0022] Figure 3 A schematic structural diagram of a first assembling device provided in an embodiment of the present invention is shown;

[0023] Figure 4 A schematic structural diagram of a second assembling device according to an embodiment of the present invention is shown;

[0024] Figure 5 A structural schematic diagram of a material discharge device provided according to an embodiment of the present invention is shown.

[0025] The above drawings include the following reference numerals:

[0026] 10. Conveying device; 20. Loading device; 21. Fifth conveying mechanism; 22. Third transfer mechanism; 30. First assembly device; 31. First assembly mechanism; 32. First transfer mechanism; 33. Front fork bowl pulling machine; 40. Second assembly device; 41. Second inflation mechanism; 42. Second transfer mechanism; 43. Second conveying mechanism; 50. Unloading device; 51. Third conveying mechanism; 52. Fourth conveying mechanism; 60. Conveying guide rail; 70. Positioning tray; 80. Frame. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] like Figures 1 to 5As shown, an embodiment of the present invention provides an assembly line for assembling vehicles, primarily electric motorcycles in this embodiment. Specifically, the assembly line in this embodiment includes a conveying device 10, a loading device 20, a first assembly device 30, a second assembly device 40, and an unloading device 50. The conveying device 10 is used to convey a vehicle frame 80 and has a loading position, a first assembly position, a second assembly position, and an unloading position. When the conveying device 10 moves to the loading position, the loading device 20 is used to transport the vehicle frame 80 to the conveying device 10. The first assembly device 30 is spaced apart from the loading device 20 and is used to assemble and transport the first wheel hub assembly of the vehicle. When the conveying device 10 moves to the first assembly position, the first assembly device 30 transports the first wheel hub assembly of the vehicle to the conveying device 10. The second assembly device 40 is located on a side of the first assembly device 30 away from the loading device 20 and is used to assemble and transport the second wheel hub assembly of the vehicle. When the conveying device 10 moves to the second assembly position, the second assembly device 40 delivers the second wheel hub assembly of the vehicle to the conveying device 10. The unloading device 50 is disposed on a side of the second assembly device 40 away from the first assembly device 30. When the conveying device 10 moves to the unloading position, the unloading device 50 is used to transfer the vehicle frame 80 on the conveying device 10. Specifically, in this embodiment, the first wheel hub is the front wheel, the second wheel hub is the rear wheel, the first wheel hub assembly is the front wheel assembly, and the second wheel hub assembly is the rear wheel assembly. The conveying device 10 in this embodiment can be an AGV.

[0029] When assembling a vehicle using the assembly line provided in this embodiment, the conveyor 10 first moves to the loading position, allowing the loading device 20 to deliver the vehicle frame 80 to the conveyor 10. The conveyor then moves, carrying the frame 80, to the first assembly position, allowing the first assembly device 30 to deliver the assembled vehicle front wheel assembly to the conveyor 10, allowing workers to install the front wheel assembly on the conveyor's frame 80. The conveyor then moves, carrying the frame 80 with the front wheel assembly installed, to the second assembly position, allowing the second assembly device 40 to deliver the assembled vehicle rear wheel assembly to the conveyor 10, allowing workers to install the rear wheel assembly on the frame 80. At this point, the assembly of the frame 80 is complete. The conveyor then moves, carrying the frame 80 with the front and rear wheel assemblies installed, to the unloading position, allowing the unloading device 50 to transfer the assembled vehicle frame 80 from the conveyor 10.

[0030] The above-described working process is the vehicle assembly process. The conveyor device 10 transports the vehicle frame 80, enabling the frame 80 to be moved to the loading position, the first assembly position, the second assembly position, and the unloading position. The first assembly device 30 and the second assembly device 40 provide the front and rear wheel assemblies to the conveyor device 10, facilitating assembly by the operator. The assembly line provided in this embodiment eliminates the need for manual handling and transfer of the vehicle frame 80 for assembly, improving the automation level of the assembly line and avoiding the time-consuming and labor-intensive manual installation process.

[0031] Specifically, the vehicle assembly area in this embodiment is divided into a frame 80 loading area, a front wheel assembly area, a rear wheel assembly area, and a vehicle body roll-off area. Automated guided vehicle (AGV) systems automatically transfer and transport components between these areas. The AGVs stop at each station awaiting work and automatically move to the next station upon completion. The AGVs operate within a 36-second cycle at each station, enabling the assembly line provided by this embodiment to achieve a production cycle of 36 seconds per vehicle.

[0032] To facilitate the movement of the conveyor device 10, the assembly line in this embodiment further includes a conveyor rail 60. The conveyor device 10 is movably mounted on the conveyor rail 60, allowing the conveyor device 10 to move to a loading position, a first assembly position, a second assembly position, and an unloading position. To further enhance operational convenience, the loading device 20, the first assembly device 30, the second assembly device 40, and the unloading device 50 are all mounted on the conveyor rail 60. This allows the loading device 20, the first assembly device 30, and the second assembly device 40 to conveniently supply vehicle components to the conveyor device 10 and also facilitates the unloading device 50 in transferring assembled vehicles.

[0033] Specifically, the conveying guide rail 60 in this embodiment is a circular track to move the conveying device 10 from the unloading position to the loading position. With such a configuration, the conveying device 10 can be easily circulated, so that the conveying device 10 can quickly enter the next assembly work after completing one assembly work.

[0034] like Figure 2As shown, the loading device 20 in this embodiment includes a third transfer mechanism 22, which can be a hoisting and rotating truss mechanism. Specifically, in the loading area of ​​the frame 80, the hoisting and rotating truss mechanism is used, and the frame 80 transplanting device is moved to a position above the roller line corresponding to the frame 80. The lifting cylinder of the frame 80 transplanting device descends, and the three fixed claws of the frame 80 transplanting device clamp the frame 80. Subsequently, the lifting cylinder of the frame 80 transplanting device rises and the transplanting cylinder moves to the top of the AGV trolley. During the transplanting process, the flipping mechanism of the frame 80 transplanting device rotates 90 degrees, and then the lifting cylinder of the frame 80 transplanting device descends, placing the frame 80 on the positioning tray 70. The clamp of the AGV trolley automatically extends and clamps the frame 80 in the clamp. After the clamping cylinder of the frame 80 transplanting device releases the frame 80, the mechanism rises, and the action is completed. The loading device 20 in this embodiment further includes a fifth conveying mechanism 21 , which is used to convey the frame 80 to the AGV.

[0035] like Figure 3 As shown, the first assembly device 30 in this embodiment includes a first assembly mechanism 31, which is used to assemble the vehicle's first wheel hub and the vehicle's hard brake disc. This arrangement facilitates the assembly of the front wheel and hard brake disc, improving the automation level of the assembly line and, in turn, increasing assembly efficiency. Specifically, the first assembly mechanism 31 in this embodiment is an automatic hard brake disc assembly machine.

[0036] In this embodiment, the first assembly device 30 further includes a first transfer mechanism 32 and a first inflation mechanism. The first transfer mechanism 32 is used to transfer the first wheel hub of the vehicle. The first inflation mechanism is spaced apart from the first assembly mechanism 31. The first transfer mechanism 32 is used to transfer the first wheel hub of the vehicle from the first assembly mechanism 31 to the first inflation mechanism, whereupon the first inflation mechanism inflates the first wheel hub of the vehicle. This arrangement eliminates the need for manual transport of the first wheel hub to the first inflation mechanism, improving work efficiency.

[0037] Specifically, the first assembly device 30 in this embodiment also includes a front fork bowl-pulling machine 33, which is spaced apart from the first inflation mechanism. A first transfer mechanism 32 is used to transfer the first wheel hub from the first inflation mechanism to the front fork bowl-pulling machine 33, whereupon the front fork bowl-pulling machine 33 assembles the first wheel hub with the vehicle's front fork to form the first wheel hub assembly. This arrangement improves the automation level of the device and enhances work efficiency.

[0038] In the front wheel assembly area, the disc brake disc and the first wheel hub are automatically assembled using the first assembly mechanism 31. In this embodiment, the first transfer mechanism 32 can be a lifting truss, which automatically transports the first wheel hub to the automatic tire installation and inflation machine. After installation and inflation, the lifting and flipping mechanism moves the first wheel hub to the tire conveyor. The tire conveyor transports the tire to the front fork bowl pulling machine 33. After the front fork and front wheel are assembled, the operator uses a self-lifting device to move the first wheel hub assembly to the frame 80 on the AGV for assembly. Once assembly is complete, the AGV transports the frame 80 to the next workstation.

[0039] like Figure 4 As shown, in this embodiment, the second assembling device 40 includes a second inflation mechanism 41, and the second inflation mechanism 41 is used to inflate the second wheel hub of the vehicle.

[0040] In order to further improve the working efficiency of the second assembly device 40, the second assembly device 40 in this embodiment further includes a second transfer mechanism 42 and a second conveying mechanism 43. The second transfer mechanism 42 is used to transfer the second wheel hub of the vehicle. The second conveying mechanism 43 is spaced apart from the second inflation mechanism 41. The second transfer mechanism 42 is used to transfer the second wheel hub on the second inflation mechanism 41 to the second conveying mechanism 43, so that the second wheel hub assembly of the vehicle is delivered to the conveying device 10 via the second conveying mechanism 43.

[0041] Specifically, the second conveying mechanism 43 in this embodiment includes a conveying portion and a stop portion, the stop portion is movably provided on the conveying portion, and the stop portion has a stop position and an avoidance position. When the stop portion is in the stop position, the stop portion abuts against the second hub on the conveying portion to limit the movement of the second hub. When the stop portion is in the avoidance position, the stop portion avoids the second hub on the conveying portion so that the conveying portion conveys the second hub. Specifically, when the stop portion is in the stop position, the staff can install the drum brake on the second hub. After installation, the stop portion can be moved from the stop position to the avoidance position to convey the assembled second hub assembly to the conveying device 10 through the conveying portion, so that the staff can install the second hub assembly on the vehicle frame 80.

[0042] In the rear wheel assembly area, after the rear wheel assembly and inflation are complete, the rear wheel flipping device is moved to the corresponding turntable station. The cylinder descends, the clamping jaws clamp the rear wheel, and the cylinder rises, then the transfer cylinder moves above the conveyor belt. During the transfer process, the flipping mechanism rotates 90 degrees, and the lifting cylinder descends, placing the frame 80 on the conveyor belt. The conveyor belt is equipped with a stop fixture mechanism. The operator installs the drum brake and then installs the components into the frame 80. After completing the above assembly work, the AGV is released for transportation to the next station.

[0043] In order to prevent the frame 80 from shaking during transportation, the assembly production line in this embodiment also includes a positioning pallet 70, which is used to position the frame 80. The conveying device 10 includes a conveying body, a driving mechanism and a detection mechanism, and the driving mechanism and the detection mechanism are both arranged on the conveying body. The positioning pallet 70 can be movably arranged on the conveying body. When the detection mechanism detects that the conveying device 10 moves to the unloading position, the driving mechanism drives the positioning pallet 70 to move to at least a part of the unloading device 50, so as to transfer the positioning pallet 70 through at least a part of the unloading device 50. Specifically, the driving mechanism in this embodiment can be a driving cylinder, which is used to drive the positioning pallet 70 to move to at least a part of the unloading device 50, and the detection mechanism can be a position detection component.

[0044] like Figure 5 As shown, the unloading device 50 in this embodiment includes a third conveying mechanism 51 and a fourth conveying mechanism 52, with the output end of the third conveying mechanism 51 spaced apart from the input end of the fourth conveying mechanism 52. When the conveying device 10 moves to the unloading position, the conveying device 10 is located between the third conveying mechanism 51 and the fourth conveying mechanism 52. After the conveying device 10 delivers the positioning pallet 70 with the frame 80 to the fourth conveying mechanism 52, the third conveying mechanism 51 delivers the positioning pallet 70 to the conveying device 10. This arrangement facilitates the transfer of the positioning pallet 70 with the frame 80 and provides empty pallets to the conveying device 10 for the next assembly process.

[0045] In this embodiment, the assembly production line also includes a recycling mechanism, the input end of the recycling mechanism is connected to the fourth conveying mechanism 52, and the output end of the recycling mechanism is connected to the third conveying mechanism 51, so that the empty pallets on the third conveying mechanism 51 can be recovered and conveyed to the fourth conveying mechanism 52 through the recycling mechanism.

[0046] At the vehicle body roll-off area, the AGV enters the final assembly line docking station. Specifically, the third conveying mechanism in this embodiment includes a support frame, a lifting platform, a lifting drive mechanism, and a buffer assembly. The lifting platform is mounted on the support frame so as to be movable to a first or second lifting position. The lifting drive mechanism is mounted on the support frame and connected to the lifting platform, thereby driving the lifting platform to move upward and downward. Specifically, the lifting platform drive mechanism may be a telescopic cylinder.

[0047] In this embodiment, the cache assembly is arranged on the support frame, and the cache assembly includes a tray drive mechanism and a cache table. At least a portion of the tray drive mechanism is movably arranged on the cache table so that the tray drive mechanism drives the positioning tray to move. Specifically, when the lifting platform moves to the first lifting position, the lifting platform is used to receive the positioning tray 70 transmitted by the recovery mechanism; when the lifting platform moves to the second lifting position, the tray drive mechanism transfers the positioning tray on the lifting platform to the cache table. Specifically, a transmission mechanism is provided on the recovery mechanism, and at least a portion of the transmission mechanism is movably arranged to transport the positioning tray 70 to the lifting platform.

[0048] Specifically, the cache component in this embodiment also includes a position sensor and a controller. The position sensor is used to detect whether there is a positioning pallet 70 on the conveying device. When the position sensor detects the conveying device 10 and detects that there is no positioning pallet 70 on the conveying device 10, the position sensor transmits the detection signal to the controller, and the controller controls the movement of the pallet drive mechanism to drive the positioning pallet 70 to move to the conveying device through the pallet drive mechanism. Subsequently, the controller controls the pallet drive mechanism to transport the empty positioning pallet 70 on the lifting platform to the cache table. Specifically, the pallet drive mechanism in this embodiment is used to transport the empty positioning pallet to the cache area, and transport the positioning pallet 70 in the cache area to the AGV cart. Subsequently, the AGV cart drives away from the vehicle body offline area with the empty positioning pallet 70, and the lifting platform descends to receive the next positioning pallet 70.

[0049] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: work efficiency is improved by automatically loading materials through equipment handling; the overall assembly efficiency of the frame 80 is improved by automatically inflating the first and second wheel hubs and automatically installing the disc brake disc; the automatic transfer of the second wheel hub (including the motor) and the front fork assembly saves time and effort, making it easier for employees to operate. This improves production efficiency and improves production cycle time; reduces the number of production operators; significantly improves production efficiency; reduces the amount of heavy objects to be handled; and improves product consistency and reliability.

[0050] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An assembly line for assembling vehicles, characterized in that: The assembly line comprises: A conveying device (10), the conveying device (10) is used to convey the vehicle frame (80), the conveying device (10) having a loading position, a first assembly position, a second assembly position and an unloading position; a loading device (20), which is used to transport the vehicle frame (80) to the conveying device (10) when the conveying device (10) moves to the loading position; a first assembling device (30) spaced apart from the loading device (20), the first assembling device (30) being used to assemble and transport the first wheel hub assembly of the vehicle; when the conveying device (10) moves to the first assembling position, the first assembling device (30) transports the first wheel hub assembly of the vehicle to the conveying device (10); a second assembling device (40), the second assembling device (40) being arranged on a side of the first assembling device (30) away from the loading device (20), the second assembling device (40) being used to assemble and transport the second wheel hub assembly of the vehicle; when the conveying device (10) moves to the second assembling position, the second assembling device (40) transports the second wheel hub assembly of the vehicle to the conveying device (10); a material unloading device (50) disposed on a side of the second assembly device (40) away from the first assembly device (30), and configured to transfer the vehicle frame (80) on the conveying device (10) when the conveying device (10) moves to the unloading position; The unloading device (50) includes a third conveying mechanism (51) and a fourth conveying mechanism (52), and the output end of the third conveying mechanism (51) is spaced apart from the input end of the fourth conveying mechanism (52); when the conveying device (10) moves to the unloading position, the conveying device (10) is located at the interval between the third conveying mechanism (51) and the fourth conveying mechanism (52), so that after the conveying device (10) conveys the positioning pallet (70) with the frame to the fourth conveying mechanism (52), the third conveying mechanism (51) conveys the positioning pallet (70) to the conveying device (10); the assembly line also includes a recycling mechanism, the input end of the recycling mechanism is connected to the fourth conveying mechanism (52), and the output end of the recycling mechanism is connected to the third conveying mechanism (51), so that the empty pallet on the fourth conveying mechanism (52) is recycled by the recycling mechanism and conveyed to the third conveying mechanism (51); The third conveying mechanism (51) comprises: Support frame; A lifting platform is escalably disposed on the support frame so as to move the lifting platform to a first lifting position or a second lifting position; A cache assembly is arranged on the support frame, the cache assembly includes a tray drive mechanism and a cache table, at least part of the tray drive mechanism is movably arranged on the cache table, so that the tray drive mechanism drives the positioning tray (70) to move; When the lifting platform moves to the first lifting position, the lifting platform is used to receive the positioning tray (70) transmitted by the recovery mechanism; when the lifting platform moves to the second lifting position, the tray driving mechanism transfers the positioning tray (70) on the lifting platform to the cache platform.

2. The assembly line according to claim 1, characterized in that: The assembly line also includes: A conveying rail (60), wherein the conveying device (10) is movably arranged on the conveying rail (60) so that the conveying device (10) moves to the loading position, the first assembly position, the second assembly position and the unloading position; the loading device (20), the first assembly device (30), the second assembly device (40) and the unloading device (50) are all arranged on the conveying rail (60).

3. The assembly line according to claim 2, characterized in that: The conveying guide rail (60) is a circular track, so that the conveying device (10) moves from the unloading position to the loading position.

4. The assembly line according to claim 1, characterized in that: The first assembling device (30) comprises: A first assembly mechanism (31) is used to assemble a first wheel hub of the vehicle and a hard brake disc of the vehicle.

5. The assembly line according to claim 4, characterized in that: The first assembling device (30) further comprises: a first transfer mechanism (32), the first transfer mechanism (32) being used to transfer the first wheel hub of the vehicle; The first inflation mechanism is spaced apart from the first assembly mechanism (31), and the first transfer mechanism (32) is used to transfer the first wheel hub of the vehicle on the first assembly mechanism (31) to the first inflation mechanism, so that the first inflation mechanism inflates the first wheel hub of the vehicle.

6. The assembly line according to claim 5, characterized in that: The first assembling device (30) further comprises: A front fork bowl pulling machine (33) is spaced apart from the first inflation mechanism, and the first transfer mechanism (32) is used to transfer the first wheel hub on the first inflation mechanism to the front fork bowl pulling machine (33), so that the front fork bowl pulling machine (33) assembles the first wheel hub of the vehicle with the front fork of the vehicle to form a first wheel hub assembly of the vehicle.

7. The assembly line according to claim 1, wherein: The second assembling device (40) comprises: A second inflation mechanism (41), wherein the second inflation mechanism (41) is used to inflate a second wheel hub of the vehicle.

8. The assembly line according to claim 7, characterized in that: The second assembling device (40) further comprises: a second transfer mechanism (42), the second transfer mechanism (42) being used to transfer a second wheel hub of the vehicle; The second conveying mechanism (43) is spaced apart from the second inflation mechanism (41), and the second transfer mechanism (42) is used to transfer the second wheel hub on the second inflation mechanism (41) to the second conveying mechanism (43), so as to convey the second wheel hub assembly of the vehicle to the conveying device (10) through the second conveying mechanism (43).

9. The assembly line according to claim 8, characterized in that: The second conveying mechanism (43) includes a conveying part and a stop part, wherein the stop part is movably arranged on the conveying part, and the stop part has a stop position and an avoidance position; when the stop part is at the stop position, the stop part abuts against the second hub on the conveying part to limit the movement of the second hub; when the stop part is at the avoidance position, the stop part avoids the second hub on the conveying part so that the conveying part conveys the second hub.

10. The assembly line according to any one of claims 1 to 9, characterized in that: The assembly line further comprises a positioning pallet (70), and the positioning pallet (70) is used to position the vehicle frame (80); the conveying device (10) comprises a conveying body, a driving mechanism and a detecting mechanism, and the driving mechanism and the detecting mechanism are both arranged on the conveying body; the positioning pallet (70) is movably arranged on the conveying body, and when the detecting mechanism detects that the conveying device (10) moves to the unloading position, the driving mechanism drives the positioning pallet (70) to move to at least a part of the unloading device (50), so as to transfer the positioning pallet (70) through at least a part of the unloading device (50); the cache component further comprises a position sensor and a controller, the position sensor is used to detect whether there is a positioning pallet on the conveying device; the controller is used to control the movement of the pallet driving mechanism when there is no positioning pallet on the conveying device, so as to drive the positioning pallet to move to the conveying device through the pallet driving mechanism.

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