Movable bearing type assembly line

Abstract

The utility model provides a movable bearing type assembly line which comprises a plurality of stations, a plurality of movable bearing type assembly line bodies, a plurality of movable bearing type assembly line bodies and a plurality of movable bearing type assembly line bodies. The utility model discloses a workpiece assembling machine which comprises a workbench and a plurality of movable bearing devices used for bearing assembled workpieces in a movable mode, each movable bearing device comprises a base, a plurality of rollers and a plurality of movable bearing devices, the base comprises a plurality of rollers, and the rollers are arranged to allow the base to move on the workbench in the front-back direction; the supporting flat plate is used for supporting a workpiece, is mounted above the base in a manner of being capable of rotating in a horizontal plane, and moves along with the base in the front-back direction. According to the movable bearing type assembly line, the labor amount of workers is greatly reduced, the rhythm and order of assembly work are improved, the problems existing in the previous procedure are allowed to be found in time, then remedial measures can be taken in time, the yield and work efficiency are improved, and labor and site cost is effectively saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of industrial manufacturing relates to an assembly line, especially in a kind of mobile bearing type assembly line. BACKGROUND

[0002] Assembly line is according to the sequence of technology to be assembled workpiece by one station sequentially moves to next station to carry out batch assembly equipment.Workpiece is usually moved in one direction on production line, and each station usually only needs to complete one or several operations.

[0003] The operation of assembly line has strong rhythm, strong continuity, high efficiency and other characteristics, however, with the improvement of industrial automation, people have higher requirements on the improvement of production efficiency and the reduction of production cost.In existing assembly line, especially in the assembly line of workpiece with higher degree of manual intervention, with the manual assembly line of low-voltage cabinet drawer as an example, in current operation practice, all drawers of the same type are laid out by workers in different stations to be responsible for different assembly procedures, not only occupy large area, but also manually carry workpiece, time-consuming and laborious.In addition, due to the existence of cross operation, rhythm and order are poor, when a problem occurs in a process, it may not be found in time, which has great influence on subsequent processes, accordingly, it will lead to low yield, increase of invalid working hours, and increase of site and labor cost due to untimely error correction and rework.

[0004] Therefore, it is necessary to provide an improved assembly line to solve the above problems in the prior art. SUMMARY

[0005] The present disclosure aims to provide a mobile bearing type assembly line to at least partially eliminate the defects existing in the prior art.

[0006] One object of the present disclosure is to provide a mobile bearing type assembly line, which can improve the rhythm and order of operation.

[0007] One object of the present disclosure is to provide a mobile bearing type assembly line, which can reduce the labor intensity of workers and improve the operation efficiency.

[0008] Another object of the present disclosure is to provide a mobile bearing type assembly line, which can save site and labor cost.

[0009] Another object of the present disclosure is to provide a mobile bearing type assembly line, which can improve the yield of products.

[0010] To achieve at least one of the above objectives, according to one aspect of this disclosure, a mobile carrier assembly line is provided, comprising: a plurality of workstations arranged sequentially such that the workstation platforms of the plurality of workstations form a workbench extending linearly in a horizontal plane; and a plurality of mobile carrier devices for movably carrying assembled workpieces, each mobile carrier device comprising: a base including a plurality of rollers configured to allow the base to move in a front-rear direction on the workbench; and a support plate for supporting the workpiece, the support plate being mounted above the base in a rotatable manner in the horizontal plane and moving with the base in a front-rear direction.

[0011] In this disclosure, by using a mobile support device to replace manual labor for carrying and moving workpieces, the workload of workers is greatly reduced, the rhythm and order of assembly operations are improved, problems in the previous process can be detected in time, and remedial measures can be taken in time, avoiding problems such as increased rework and low yield caused by delayed problem detection, and saving time and labor costs.

[0012] Furthermore, the multiple rollers of the mobile support device include at least a first set of rollers and a second set of rollers located on the lateral sides of the base, and a guide rail extending along the entire length of the worktable in the front-back direction is provided on the worktable, wherein the guide rail is configured to cooperate with at least one of the first set of rollers and the second set of rollers to guide the movement of the mobile support device on the worktable.

[0013] In this disclosure, the linear movement of the mobile bearing device can be effectively guided by the cooperation of the guide rail and the roller, which improves the orderliness and avoids unwanted collisions that may be caused by the movement of the mobile bearing device in other directions.

[0014] Preferably, both ends of the guide rail are provided with stoppers to prevent the rollers from moving beyond the guide rail, thereby enhancing the safety of the system and operation.

[0015] Preferably, the support plate of the movable bearing device is mounted on the base via a rotating disk, allowing the support plate to rotate 360° relative to the base on the horizontal plane. This facilitates multi-angle assembly of workpieces by workers, reduces manual labor, and further improves work efficiency.

[0016] Furthermore, the mobile support device also includes a rotation locking assembly, which comprises: a spring pin installed in a longitudinal through hole in the base; and a plurality of fixing holes disposed in the support plate; wherein each fixing hole is configured such that when the support plate rotates to a corresponding rotation angle, the fixing hole aligns vertically with the longitudinal through hole, allowing the spring pin to be inserted into the fixing hole under the action of a spring biasing force, thereby locking the support plate relative to the base at that rotation angle. The rotation locking assembly improves the stability of the device while ensuring ease of operation.

[0017] For example, the plurality of fixing holes includes four fixing holes that correspond to rotation angles of 0°, 90°, 180°, and 270° of the supporting plate, respectively.

[0018] Preferably, at least one of the first set of rollers and the second set of rollers includes a roller brake that is operable to hold the movable support device in a desired position on the worktable and prevents the movable support device from shifting during assembly operations, thereby improving the stability of the movable support device.

[0019] Furthermore, elastic anti-collision posts are provided on both the front and rear sides of the base, protruding beyond the outermost edge of the mobile support device in the front-rear direction. By setting up anti-collision elements, accidental pinching injuries to operators caused by collisions between two adjacent mobile support devices are avoided, while allowing workers to access the edges of the mobile support devices through the gap to perform the required operations.

[0020] Furthermore, it also includes a return device comprising: a hanging rail extending along the entire length of the worktable in the front-rear direction, the hanging rail being fixed to a frame at multiple workstations; and a pulley disposed on the lateral side of the base of the mobile support device, wherein the mobile support device is vertically suspended on the hanging rail by the cooperation of the pulley and the hanging rail, and is movable as the pulley slides in the hanging rail.

[0021] Preferably, the end of the hanging rail located at the last station is the starting end, and the end located at the first station is the ending end. A stop bolt is provided at the ending end, which can switch between a stop position and a retracted position, thereby selectively preventing or allowing the pulley to slide beyond the ending end of the hanging rail, wherein the hanging rail extends in a horizontal direction; or the hanging rail is inclined downward from the starting end toward the ending end.

[0022] In this disclosure, by providing an automatic return device, the manual handling of the mobile support device is eliminated after a work cycle, effectively reducing the workload of workers, saving labor costs, saving working hours, and improving efficiency. Furthermore, since the mobile support device is directly suspended from the uprights at the workstation for return, there is no need to set up dedicated space outside the assembly line for placing or moving the mobile support device, thus significantly saving on site costs.

[0023] The assembly line disclosed herein represents a significant improvement over existing technologies. It features clear division of labor among processes with no overlapping operations, improving the rhythm and order of operations. Quality issues can be identified and rectified immediately, reducing rework, effectively increasing the yield rate, and reducing wasted time. Personnel do not need to move around or transport workpieces, reducing workload and increasing production efficiency. It also occupies less space, reducing site costs. Therefore, it effectively solves the aforementioned problems in existing technologies. Attached Figure Description

[0024] The features and advantages of one or more embodiments of the present invention will become more readily apparent from the following description with reference to the accompanying drawings. The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. The drawings are not drawn to scale and some features may be enlarged or reduced to show details of specific components. In the drawings:

[0025] Figure 1 This is a schematic top view illustrating the main structural components of a mobile carrier-type assembly line according to an embodiment of the present disclosure;

[0026] Figure 2 This is a side view of a mobile load-bearing assembly line according to an embodiment of the present disclosure;

[0027] Figure 3 This is a side view of a mobile carrier device in a mobile carrier assembly line according to an embodiment of the present disclosure, viewed from the left.

[0028] Figure 4 This is a side view of the mobile carrier device in a mobile carrier assembly line according to an embodiment of the present disclosure, viewed from the front (operating side).

[0029] Figure 5 This is a top view schematic diagram of a mobile carrier device in a mobile carrier-type assembly line according to an embodiment of the present disclosure; and

[0030] Figure 6 This is a schematic diagram of a mobile carrier assembly line according to an embodiment of the present disclosure, viewed from the front (operating side), wherein the mobile carrier is shown in a suspended state.

[0031] Explanation of icon numbers:

[0032] S1, First workstation; S2, Last workstation

[0033] 10. Workbench 12. Stand

[0034] 14. Guide rail 15. Stop component

[0035] 17. Suspension rail 18. Stop bolt

[0036] 17a. Starting end; 17b. Ending end

[0037] 20. Mobile support device; 21. Base; 23. Support plate

[0038] 22A, First set of rollers; 22B, Second set of rollers; 24, Rotary disc.

[0039] 25. Spring pin; 26. Longitudinal through hole; 27. Fixing hole

[0040] 28. Flexible anti-collision posts 29. Pulleys Detailed Implementation

[0041] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise.

[0043] Figure 1 and Figure 2 This is a schematic diagram of the main components of a mobile load-bearing assembly line according to an embodiment of the present disclosure.

[0044] The mobile load-bearing assembly line according to an embodiment of this disclosure includes multiple workstations arranged continuously in a straight line, each workstation corresponding to one assembly process. Taking the assembly process of a low-voltage cabinet drawer as an example, it may include five processes: the first process: component installation; the second process: primary wiring; the third process: secondary wiring; the fourth process: main lock and finishing; and the fifth process: self-inspection and testing. Correspondingly, five workstations can be provided, from upstream to downstream: the first workstation, the second workstation, the third workstation, the fourth workstation, and the fifth workstation.

[0045] Figure 1 The main structural components of a mobile, load-bearing assembly line according to an embodiment of the present disclosure are schematically shown, wherein, for simplicity and clarity, only three workstations are shown. The three workstations are arranged sequentially in a front-to-back direction, from the first workstation S1 to the last workstation S2. The workstation platforms of these workstations can be connected to each other to form a workbench 10 extending linearly in a horizontal plane.

[0046] Compared to existing designs, the special feature of this utility model is that, as Figure 1 As shown, the mobile carrier assembly line includes multiple mobile carrier devices 20 for movably carrying the workpieces to be assembled. Each mobile carrier device 20 includes: a movable base 21 including multiple rollers to allow the base 21 to move in a front-back direction on the worktable 10; and a support plate 23 supporting the workpiece, which is mounted above the base 21 in a rotatable manner in a horizontal plane and moves with the base 21 in a front-back direction. In this document, "front-back direction" corresponds to the upstream and downstream directions of the assembly line; specifically, "forward" corresponds to the upstream direction of the assembly line, and "backward" corresponds to the downstream direction of the assembly line.

[0047] By using the mobile carrier 20 to carry and transport workpieces to be assembled, workers can perform corresponding operations at their respective workstations. After completing an operation, workers do not need to move the workpieces; they only need to push the mobile carrier 20 carrying the workpieces to the next workstation for the next operation, and then continue to perform the same operation on workpieces transported from the previous workstation. Therefore, the workload of workers is greatly reduced.

[0048] Furthermore, by having the mobile support device pass sequentially through continuously arranged workstations on the workbench 10 from front to back, the assembly process can be carried out in a sequential and orderly manner from one process to the next, avoiding overlapping operations and thus effectively improving the rhythm and order of the assembly operation. Moreover, when a quality problem occurs in one process, workers in the next process can promptly identify the problem and take remedial measures, avoiding problems such as increased rework and low yield rates caused by delayed problem detection, while also saving time and labor costs.

[0049] Furthermore, the support plate 23 is mounted above the base 21 in a manner that allows it to rotate in the horizontal plane, enabling workers to rotate the support plate 23 as needed for assembly operations.

[0050] See Figure 2 and Figure 3 The movable support device 20 includes at least a first set of rollers 22A and a second set of rollers 22B located on the lateral sides of the base 21, respectively. Here, "lateral" refers to the direction of the movable support device 20 perpendicular to its direction of travel (i.e., the aforementioned front-to-back direction). A guide rail 14 extending along the entire length of the worktable 10 in the front-to-back direction is provided on the worktable 10. This guide rail 14 is configured to cooperate with at least one of the first set of rollers 22A and the second set of rollers 22B to guide the movement of the movable support device 20 on the worktable 10. As an example, such as... Figure 1 As shown, the guide rail 14 is positioned on the side closer to the worker in the transverse direction and engages with the first set of rollers 22A. In this case, the first set of rollers 22A acts as directional wheels, allowing the mobile support device 20 to move linearly along the extension direction of the guide rail 14 under its guidance. The second set of rollers 22B can be omnidirectional wheels capable of moving in any direction along with the first set of rollers 22A. This not only effectively guides the movement direction of the mobile support device 20 but also increases its flexibility. However, depending on the actual situation, the guide rail 14 can also be positioned on the other side in the transverse direction to engage with the second set of rollers 22B, or a separate guide rail 14 can be provided for each set of rollers 22A and 22B.

[0051] The cooperation of guide rails and rollers can effectively guide the linear movement of the mobile support device 20, improve orderliness, and avoid collisions that may occur due to the movement of the mobile support device 20 in other directions.

[0052] Furthermore, such as Figure 1 As shown, stop members 15 are respectively provided at both ends of the guide rail 14 to prevent the roller from moving beyond the guide rail 14, thereby enhancing operational safety. The stop member 15 is preferably made of an elastic material such as rubber to provide good cushioning.

[0053] Furthermore, for example, refer to Figure 4 The support plate 23 of the mobile support device 20 is mounted on the base 21 via a rotating disk 24, allowing the support plate 23 to rotate 360° relative to the base 21 on a horizontal plane, thereby effectively improving the convenience of worker installation. Here, the rotating disk can be any rotating connection structure that allows the support plate 23 to rotate 360°. This 360° rotatable design facilitates the assembly of various sides of the workpiece in place. For example, when it is necessary to install components on the back of the workpiece, simply rotate the support plate 23 180° clockwise or counterclockwise to make the back of the workpiece face the worker, greatly simplifying the worker's operation.

[0054] Furthermore, the movable support device 20 includes a rotation locking assembly in the form of a spring pin 25, which is installed in the longitudinal through hole 26 of the base 21. Correspondingly, a plurality of fixing holes 27 are provided in the support plate 23. Each fixing hole 27 is configured such that, in use, when the support plate 23 rotates to a corresponding rotation angle, the fixing hole 27 is vertically aligned with the longitudinal through hole 26, allowing the spring pin 25 to be inserted into the fixing hole 27 under the action of the spring biasing force, thereby locking the support plate 23 relative to the base 21 at that rotation angle. When it is necessary to change the angle of the support plate 23 or when the movable support device 20 is no longer used, the spring pin 25 can be removed from the fixing hole 27 by overcoming the spring biasing force, thereby unlocking the support plate 23 relative to the base 21.

[0055] The shape and size of the support plate 23 can be set according to the shape and size of the workpiece to be installed. Furthermore, the number and location of the fixing holes can be determined according to the number and location of the workpiece's assembly surfaces. (For example...) Figure 5 and Figure 6 In the example shown, assuming the workpiece being carried is a low-pressure cabinet drawer, the support plate 23 is set to a rectangular shape corresponding to the approximately rectangular shape of the drawer and the four sides to be assembled. In this case, the support plate 23 may include at least four fixing holes corresponding to its rotation angles of 0°, 90°, 180°, and 270°, that is, corresponding to the four sides of the low-pressure cabinet drawer respectively.

[0056] The rotatable design of the support plate and the rotation locking component not only facilitate workers to assemble workpieces from multiple angles, but also ensure stability during operation, reduce workers' physical labor, and further improve work efficiency.

[0057] As a preferred embodiment, at least one of the first set of rollers 22A and the second set of rollers 22B may include a roller brake (not shown in the figure). This roller brake can be manually operated, and the worker can operate the roller brake to hold the mobile carrier 20 at the desired operating position on the worktable 10 when the mobile carrier is moved to the desired operating position. However, depending on actual needs, the roller brake may also be mounted on the worktable.

[0058] By providing this roller brake, the mobile support device can be held in the desired operating position and can be prevented from shifting during assembly operations, thus improving the stability of the mobile support device.

[0059] Furthermore, to prevent the mobile support device 20 from colliding with adjacent mobile support devices during movement, and even causing accidental personal injury such as pinching hands, anti-collision elements with appropriate length and buffering performance can be provided on the front and rear sides of the base 21, for example... Figure 4 and Figure 5 The elastic anti-collision post 28 shown should protrude beyond the outermost edge of the entire mobile support device 20 in the front-back direction, so that when two mobile support devices 20 are close together, the edges of the two mobile support devices 20 are separated by a sufficiently large gap to avoid pinching the worker's hand, while allowing the worker to reach the edge of the mobile support device 20 through the gap to perform the required operation, such as pushing the mobile support device 20.

[0060] The mobile carrier device 20 moves sequentially from the first workstation to the last workstation according to the execution order from the first process to the last process, thus completing its flow throughout the entire assembly line. At this point, the assembled workpiece can be unloaded from the mobile carrier device 20, which can then return to its initial position on the assembly line for use in the next work cycle.

[0061] To facilitate the return of the mobile carrier 20 and further save manpower and time costs, the assembly line according to the present disclosure also includes a return device for transporting the mobile carrier 20, which has completed one work cycle, back to the initial position of the assembly line. The return device includes: a hanging rail 17 extending across all workstations of the entire assembly line in the front-back direction, the hanging rail 17 being fixed to the upright frame 12 of the workstation; and a pulley 29 disposed on the lateral side of the base 21 of the mobile carrier 20, wherein the mobile carrier 20 can be vertically suspended on the hanging rail 17 by the cooperation of the pulley 29 and the hanging rail 17, and can move along the hanging rail 17 with the pulley 29.

[0062] In this return flow device, according to the return flow direction, the end of the hanging rail 17 located at the last station S2 is the starting end 17a, and the end at the first station S1 is the ending end 17b. A stop bolt 18 is provided at the ending end 17b, which can switch between a stopped position and a retracted position, thereby selectively preventing or allowing the pulley 29 to slide beyond the ending end 17b of the hanging rail 17. When the returned mobile carrier 20 is not needed immediately, it can be stopped on the hanging rail 17 by the stop bolt 18 in the stopped position; when the mobile carrier 20 needs to be used, the stop bolt 18 can be manually switched to the retracted position, thereby allowing the mobile carrier 20 to be removed from the ending end 17b of the hanging rail 17 and placed on the first station S2 to start a new round of assembly line operation.

[0063] Optionally, the suspension rail 17 can extend horizontally. When a mobile support device 20 needs to return, only a small thrust needs to be applied to the mobile support device 20 at the starting end 17a of the suspension rail 17 to provide initial velocity. This will cause the mobile support device 20 to automatically return to the starting end 17a through the cooperation of the pulley 29 and the suspension rail 17. Alternatively, the suspension rail 17 can be inclined downward at a small angle from the starting end 17a toward the ending end 17b, so that the mobile support device 20 automatically moves toward the ending end 17b after being suspended at the starting end 17a of the suspension rail 17.

[0064] By setting up an automatic return device, the mobile support device 20 no longer needs to be manually moved, effectively reducing the workload of workers, saving labor costs, saving working hours, and improving efficiency. Furthermore, since the mobile support device 20 is directly suspended from the uprights at the workstation for return, there is no need to set up dedicated space outside the assembly line for placing or moving the mobile support device 20, thus significantly saving on site costs.

[0065] Based on the foregoing description of specific embodiments of the assembly line according to this disclosure, it can be seen that the assembly line of this disclosure mainly includes a worktable linearly extending on a horizontal plane, composed of multiple workstation platforms; and multiple moving support devices capable of carrying the assembled workpieces on the worktable. The main improvement lies in:

[0066] ① Use mobile support devices to replace manual labor in carrying and transporting workpieces to be assembled.

[0067] ② The support plate of the mobile bearing device is mounted on the base via a rotating disk, so that the support plate can rotate 360° relative to the base on the horizontal plane.

[0068] ③ Anti-collision elements with appropriate length and buffering performance are respectively installed on the front and rear sides of the base of the mobile bearing device.

[0069] ④ Includes a return device for transporting the mobile carrier that has completed a work cycle back to the initial position of the production line.

[0070] The advantages of the assembly line disclosed herein are as follows:

[0071] ① Using mobile support devices to replace manual labor for carrying and moving workpieces greatly reduces the workload of workers, improves the rhythm and order of assembly operations, allows for timely detection of problems in the previous process, and enables timely remedial measures to be taken. This avoids problems such as increased rework and low yield caused by delayed problem detection, and also saves time and labor costs.

[0072] ②The support plate of the mobile bearing device can rotate 360° relative to the base on the horizontal plane, which facilitates workers to assemble workpieces from multiple angles, reduces workers' physical labor, and further improves work efficiency.

[0073] ③ The mobile support device includes a rotation locking assembly to allow the support plate to be locked relative to the base at the rotation angle, thereby improving the stability of the device while ensuring ease of operation.

[0074] ④ The cooperation between the guide rail and the base rollers can effectively guide the linear movement of the mobile bearing device on the work platform, improving orderliness and avoiding unwanted collisions caused by the movement of the mobile bearing device in other directions.

[0075] ⑤ Stops are provided at both ends of the guide rail to prevent the rollers from moving beyond the guide rail, thereby enhancing the safety of the system and operation.

[0076] ⑥ At least one of the first set of rollers and the second set of rollers may include a roller brake that can hold the mobile support device in the desired operating position and prevent the mobile support device from shifting during assembly operations, thus improving the stability of the mobile support device.

[0077] ⑦ Anti-collision elements are installed on the front and rear sides of the mobile support device to avoid accidental pinching injuries to the operator caused by the collision of two adjacent mobile support devices, while allowing the worker to reach the edge of the mobile support device through the gap to perform the required operation.

[0078] ⑧ An automatic return system is provided, eliminating the need for manual handling of the mobile support device after each work cycle. This effectively reduces worker workload, saves labor costs, saves time, and improves efficiency. Furthermore, since the mobile support device is directly suspended from the uprights at the workstation for return, there is no need to set up dedicated space outside the assembly line for placing or moving the mobile support device, thus significantly saving on site costs.

[0079] The various embodiments and variations of this utility model have been described in detail above. However, those skilled in the art should understand that this utility model is not limited to the specific embodiments and variations described above, but may include various other possible combinations and arrangements. Other variations and modifications can be implemented by those skilled in the art without departing from the spirit and scope of this utility model. All these variations and modifications fall within the scope of this utility model. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A mobile-carrying assembly line, comprising: a plurality of stations arranged in succession such that the station platforms thereof constitute a workbench (10) extending linearly in a horizontal plane; characterized by further comprising a plurality of mobile carrying devices (20) for carrying a workpiece being assembled in a mobile manner, each mobile carrying device (20) comprising: a base (21) comprising a plurality of rollers arranged to allow the base (21) to move in a fore-aft direction on the workbench (10); and a support plate (23) supporting the workpiece, the support plate (23) being rotatably mounted above the base (21) and moving with the base (21) in the fore-aft direction.

2. The mobile-carrying assembly line according to claim 1, characterized in that: the plurality of rollers of the mobile carrying device (20) comprises at least a first set of rollers (22A) and a second set of rollers (22B) respectively located on the lateral sides of the base (21), and the workbench (10) is provided with a guide rail (14) extending in the fore-aft direction on the entire length of the workbench (10), wherein the guide rail (14) is arranged to cooperate with at least one of the first set of rollers (22A) and the second set of rollers (22B) to guide the movement of the mobile carrying device (20) on the workbench (10).

3. The mobile carry-in assembly line of claim 2, wherein, Both ends of the guide rail (14) are provided with stoppers (15) to prevent the rollers from moving beyond the guide rail (14).

4. The mobile carry-in assembly line of claim 1, wherein, The support plate (23) of the mobile carrying device (20) is mounted on the base (21) via a rotary disc (24) such that the support plate (23) can rotate 360° relative to the base (21) in a horizontal plane.

5. The mobile carry-in assembly line according to any one of claims 1-4, wherein, The mobile carrying device (20) comprises a rotation locking assembly, which comprises: a spring latch (25) mounted in a longitudinal through-hole (26) of the base (21); a plurality of fixing holes (27) arranged in the support plate (23); wherein each fixing hole (27) is arranged such that when the support plate (23) is rotated to a corresponding rotation angle, the fixing hole (27) is aligned with the longitudinal through-hole (26) up and down to allow the spring latch (25) to be inserted into the fixing hole (27) under the action of a spring biasing force, thereby locking the support plate (23) relative to the base (21) at the rotation angle.

6. The mobile-carrying assembly line according to claim 5, characterized in that: the plurality of fixing holes (27) comprises at least four fixing holes corresponding to the rotation angles of 0°, 90°, 180° and 270° of the support plate (23), respectively.

7. The mobile carry-in assembly line of claim 2, wherein, At least one of the first set of rollers (22A) and the second set of rollers (22B) comprises a roller brake operable to hold the mobile carrier (20) at a desired position of the worktable (10).

8. The mobile carry-in assembly line of any one of claims 1-4, wherein, The base (21) is provided with elastic anti-collision columns (28) on both front and rear sides, which protrude beyond the outermost edges of the mobile carrier (20) in the front-rear direction.

9. The mobile carry-in assembly line of any one of claims 1-4, wherein, Further comprising a backflow device comprising: A hanging rail (17) extending along the front-rear direction over the entire length of the worktable (10), the hanging rail (17) being fixed on the stands (12) of the plurality of stations; and A pulley (29) provided on the lateral side of the base (21) of the mobile carrier (20), Wherein the mobile carrier (20) can be vertically hung on the hanging rail (17) through cooperation of the pulley (29) in the hanging rail (17), and can be moved along with the sliding of the pulley (29) in the hanging rail (17).

10. The mobile carry-in assembly line of claim 9, wherein, The end of the hanging rail (17) at the last station (S2) in the plurality of stations is a starting end (17a), and the end of the hanging rail (17) at the first station (S1) in the plurality of stations is a terminal end (17b), and a stop pin (18) is provided at the terminal end (17b), the stop pin (18) can be switched between a stop position and a retracted position, thereby selectively preventing or allowing the pulley (29) to slide beyond the terminal end (17b) of the hanging rail (17), Wherein the hanging rail (17) extends in the horizontal direction; or the hanging rail (17) is downwardly inclined from the starting end (17a) towards the terminal end (17b).

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