A flow conveying device for frame production

Abstract

The present invention is applicable to the technical field of complete vehicle manufacturing and provides a flow conveying device for vehicle frame production, including a suspension unit and a conveying shell. The controllable track unit consists of a top track, side guide rails, and a push-pull cylinder B. The side guide rails are fixed to both sides of the bottom of the conveying shell, and the top track is fixed to the top of the conveying shell via multiple push-pull cylinders B. The stable travel assembly includes a rack, a U-shaped bracket, a suspension spindle, gears, and a dual-output shaft motor. The suspension spindle is equipped with a middle wheel in the middle to cooperate with the top track, and side wheels are installed on the front and rear sides to cooperate with the side guide rails. The U-shaped bracket on the suspension spindle has a built-in dual-output shaft motor, the gear connected to the output end of which meshes with the rack. The U-shaped bracket is provided with load-bearing tracks on the front and rear sides to slide in connection with the conveying shell. The present invention achieves convenient maintenance and adjustment by flexibly disassembling and assembling the stable travel assembly, while ensuring that the suspension unit can stably and reliably suspend and control the vehicle frame.

Description

Technical Field

[0001] The present invention belongs to the technical field of complete vehicle manufacturing, and in particular relates to a flow conveying device for vehicle frame production. Background Art

[0002] An electric vehicle (EV) is a vehicle that uses one or more onboard electric motors as a power source, replacing a traditional internal combustion engine. The main types of EVs include pure electric vehicles, plug-in hybrid vehicles, and extended-range electric vehicles. These vehicles use rechargeable batteries to power the electric motors, which in turn drive the vehicle.

[0003] Traditional conveyor systems in the vehicle frame production process often face challenges with inconvenient maintenance, limited adjustment flexibility, and insufficient operational stability. These systems typically utilize fixed tracks and components, requiring time-consuming and labor-intensive disassembly and reassembly for maintenance or to adjust the equipment layout to meet production needs.

[0004] Therefore, in view of the above situation, there is an urgent need to develop a flow conveying device for frame production to overcome the shortcomings in current practical applications. Summary of the Invention

[0005] The object of the present invention is to provide a flow conveying device for frame production, aiming to solve the problems mentioned in the above background technology.

[0006] The present invention is achieved by providing a flow conveying device for vehicle frame production, comprising a suspension unit and a conveying shell, wherein the suspension unit is used to suspend the vehicle frame and control its lifting and lowering, and the bottom of the conveying shell is provided with a bottom opening, and further comprising:

[0007] A controllable track unit, comprising a top track, side guide rails, and a push-pull cylinder B. Side guide rails are fixed to the front and rear sides of the inner bottom of the conveying shell, and multiple push-pull cylinders B are fixed to the middle of the inner top of the conveying shell. The output ends of the multiple push-pull cylinders B are fixed across the top track.

[0008] A stable travel component, which includes a rack, a U-shaped bracket, a suspension main shaft, a gear and a dual-output shaft motor. Rack fixing grooves are provided on the front and rear sides of the bottom opening on the conveying shell, and a rack is fixed to the bottom of the rack fixing groove. The middle part of the suspension main shaft is rotatably installed with a middle wheel that can cooperate with the top rail, and the front and rear sides of the suspension main shaft are rotatably installed with side wheels that can cooperate with the two side guide rails. A U-shaped bracket is also fixed on the suspension main shaft, and a dual-output shaft motor is fixed to the inner bottom of the U-shaped bracket. Gears that can mesh with the two racks are fixed at the two output ends of the dual-output shaft motor. The front and rear sides of the U-shaped bracket are also fixed with load-bearing rails that are slidably connected to the conveying shell on both sides of the bottom opening; the suspension unit is installed and fixed to the outer bottom of the U-shaped bracket.

[0009] A further technical solution is that the structural dimensions of the middle wheel and the side wheels are the same, and the wheel grooves of the middle wheel and the side wheels are rounded, the bottom of the top rail and the top of the side guide rail are rounded; the push-pull cylinders B are evenly distributed along the length direction of the top rail.

[0010] A further technical solution is that the two branches of the U-shaped bracket are fixedly connected to the suspension main shaft between the middle wheel and the side wheel; the dual-output shaft motor is fixedly connected to the two side branches and the bottom of the U-shaped bracket; the output shafts on both sides of the dual-output shaft motor are also rotatably connected to the two side branches of the U-shaped bracket through bearings.

[0011] A further technical solution is that the bearing rail adopts an inverted L-shaped structure, and two bearing rails are fixed on the front and rear sides of the U-shaped bracket, and the two bearing rails are correspondingly slidably connected to the upper and lower conveying shells of the rack fixing groove; when the push-pull cylinder B drives the top rail to descend and abut against the middle wheel, the side wheel abuts against the side guide rail, the rack is meshed with the gear, and the bearing rail is slidably connected with the conveying shell.

[0012] According to a further technical solution, the suspension unit includes a push-pull cylinder A and a hook. The push-pull cylinder A is vertically fixed to the outer bottom of the U-shaped bracket, and the output end of the push-pull cylinder A is rotatably mounted with a W-shaped hook.

[0013] A further technical solution is that the flow conveying device for frame production also includes an adjustable start-stop unit installed on the left and right sides of the U-shaped bracket of the stable travel component, the adjustable start-stop unit includes a fixed panel that is detachably fixed to the U-shaped bracket, an outer cylinder is horizontally fixed on the fixed panel, a touch plate is slidingly provided on the inner side of the outer cylinder, and an elastic member for elastically supporting the touch plate is also provided in the outer cylinder, an inner core rod that slides out from the end of the outer cylinder is fixed on the side of the touch plate away from the elastic member, a contact disk is fixed on the end of the inner core rod away from the touch plate, a push-pull cylinder C is also fixed on the inner side of the outer cylinder, and a contact switch that is electrically connected to the dual output shaft motor and used to control it is fixed at the output end of the push-pull cylinder C.

[0014] According to a further technical solution, the contact disk adopts a disc-shaped structure, and the corners of the contact disk are rounded; the elastic member adopts a spring, and when there is no external force, under the elastic force of the elastic member, the touch plate abuts against the end of the outer cylinder away from the fixed panel.

[0015] According to a further technical solution, when the contact switch is not triggered, the dual-output shaft motor works normally; when the contact switch is triggered by the touch plate, the dual-output shaft motor stops working.

[0016] A further technical solution is that when the stable travel component moves to the right, the extension length of the push-pull cylinder C of the adjustable start-stop unit on the right side of the stable travel component is greater than the extension length of the push-pull cylinder C of the adjustable start-stop unit on the left side; when the stable travel component moves to the left side, the extension length of the push-pull cylinder C of the adjustable start-stop unit on the right side of the stable travel component is less than the extension length of the push-pull cylinder C of the adjustable start-stop unit on the left side.

[0017] The present invention provides a flow conveying device for frame production, which has the following beneficial effects:

[0018] When it is necessary to disassemble or assemble the stable travel assembly, it is only necessary to control the push-pull cylinder B to shorten, thereby lifting the stable travel assembly upwards to separate the gear and rack, the transmission shell and the bearing rail, the top rail and the middle wheel, and the side wheel and the side guide rail. The stable travel assembly can then be quickly disassembled or assembled at the end of the transmission shell, that is, an appropriate number of stable travel assemblies can be selected, which is flexible and convenient. Similarly, after the push-pull cylinder B controls the top rail to cooperate with the middle wheel, the cooperation of the side wheel and the side guide rail, as well as the cooperation of the top rail and the middle wheel, can ensure that the suspension main shaft is always in a stable travel state. Combined with the stable support of the rack for the gear and the supporting effect of the sliding connection between the bearing rail and the transmission shell, the overall gear can be continuously and stably engaged with the rack. Utilizing the characteristics of the dual-output shaft motor, the stable travel assembly can move smoothly and reliably, thereby facilitating the suspension unit to suspend the frame and control its lifting and lowering.

[0019] In summary, the flow conveying device for frame production realizes convenient maintenance and adjustment through flexible disassembly and assembly of stable travel components, while ensuring stable and reliable suspension and lifting control of the frame by the suspension unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the overall structure of a flow conveying device for frame production provided by an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Another perspective structural diagram;

[0022] Figure 3 A schematic structural diagram of the portion corresponding to a single stable travel assembly in a flow conveying device for frame production provided by an embodiment of the present invention;

[0023] Figure 4 for Figure 3 Another perspective structural diagram;

[0024] Figure 5 for Figure 3 Schematic diagram of the structure without the transmission shell;

[0025] Figure 6 for Figure 5 Another perspective structural diagram;

[0026] Figure 7 A schematic diagram of the main cross-sectional structure of the adjustable start-stop unit portion of the flow conveying device for frame production provided by an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of the coordination of two adjacent adjustable start-stop units when the flow conveyor device for frame production provided by an embodiment of the present invention moves to the right;

[0028] Figure 9 A schematic diagram of the coordination of two adjacent adjustable start-stop units when the flow conveyor device for frame production provided by an embodiment of the present invention moves to the left.

[0029] In the figure: 1-suspension unit, 2-transmission shell, 3-top rail, 4-side guide rail, 5-rack fixing groove, 6-rack, 7-bottom opening, 8-U-shaped bracket, 9-push-pull cylinder A, 10-hook, 11-adjustable start-stop unit, 12-fixed panel, 13-push-pull cylinder B, 14-side wheel, 15-middle wheel, 16-suspension main shaft, 17-gear, 18-dual output shaft motor, 19-stable travel component, 20-outer cylinder, 21-inner core rod, 22-contact plate, 23-bearing rail, 24-push-pull cylinder C, 25-contact switch, 26-elastic member, 27-touch plate. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0032] like Figure 1-6 FIG. 1 shows a flow conveying device for vehicle frame production according to an embodiment of the present invention, comprising a suspension unit 1 and a conveying housing 2. The suspension unit 1 is used to suspend the vehicle frame and control its lifting. The bottom of the conveying housing 2 is provided with a bottom opening 7, and further comprises:

[0033] The controllable track unit comprises a top track 3, side guide rails 4, and push-pull cylinders B13. Side guide rails 4 are fixed to the front and rear sides of the inner bottom of the conveyor housing 2. Multiple push-pull cylinders B13 are fixed to the center of the inner top of the conveyor housing 2. The top track 3 is fixed across the output ends of these push-pull cylinders B13. The push-pull cylinders B13 are synchronously controlled by a controller, with the extension and retraction stroke error of each push-pull cylinder B13 controlled within ±0.5mm to ensure that the lifting and lowering of the top track 3 remains level. The controller's control program presets two operating modes: maintenance mode (push-pull cylinders B13 fully retracted) and operation mode (push-pull cylinders B13 extended to a set stroke).

[0034] A stable travel component 19, which includes a rack 6, a U-shaped bracket 8, a suspension main shaft 16, a gear 17 and a dual-output shaft motor 18. A rack fixing groove 5 is opened on the front and rear sides of the bottom opening 7 on the conveying shell 2, and a rack 6 is fixed to the bottom of the rack fixing groove 5. The middle part of the suspension main shaft 16 is rotatably installed with a middle wheel 15 that can cooperate with the top rail 3, and the front and rear sides of the suspension main shaft 16 are rotatably installed with side wheels 14 that can cooperate with the two side guide rails 4. A U-shaped bracket 8 is also fixed on the suspension main shaft 16, and a dual-output shaft motor 18 is fixed on the inner bottom of the U-shaped bracket 8. The two output ends of the dual-output shaft motor 18 are fixed with gears 17 that can mesh with the two racks 6. The front and rear sides of the U-shaped bracket 8 are also fixed with load-bearing rails 23 that are slidably connected to the conveying shell 2 on both sides of the bottom opening 7; the suspension unit 1 is installed and fixed to the outer bottom of the U-shaped bracket 8.

[0035] In an embodiment of the present invention, when it is necessary to disassemble and assemble the stable travel component 19, it is only necessary to control the push-pull cylinder B13 to shorten, so that the stable travel component 19 is lifted upward to separate the gear 17 and the rack 6, the conveying shell 2 and the load-bearing rail 23, the top rail 3 and the middle wheel 15, and the side wheel 14 and the side guide rail 4. The stable travel component 19 can be quickly disassembled and assembled at the end of the conveying shell 2, that is, an appropriate number of stable travel components 19 can be selected, which is flexible and convenient. Similarly, after the push-pull cylinder B13 controls the top rail 3 to cooperate with the middle wheel 15, the cooperation between the side wheel 14 and the side guide rail 4, as well as the cooperation between the top rail 3 and the middle wheel 15, can ensure that the suspension main shaft 16 is always in a stable moving state, combined with the stable support of the rack 6 for the gear 17 and the supporting effect of the sliding connection between the load-bearing rail 23 and the conveying shell 2, the overall gear 17 can continue to stably engage with the rack 6, and the characteristics of the dual-output shaft motor 18 are utilized to make the stable moving component 19 move smoothly and reliably, thereby facilitating the suspension unit 1 to suspend the frame and control its lifting and lowering.

[0036] In summary, the flow conveying device for frame production realizes convenient maintenance and adjustment by flexibly disassembling and assembling the stable travel component 19, while ensuring that the suspension unit 1 performs stable and reliable suspension and lifting control on the frame.

[0037] like Figure 1-6 As shown, as a preferred embodiment of the present invention, the conveying shell 2 can adopt a linear structure or an annular structure, which can be processed and welded as needed according to production needs, and a detachable structure can be arranged to meet the disassembly and assembly requirements of the stable travel component 19.

[0038] The middle wheel 15 and the side wheel 14 have the same structural dimensions, and the wheel grooves of the middle wheel 15 and the side wheel 14 are both rounded, and the bottom of the top track 3 and the top of the side guide rail 4 are both rounded to reduce friction and improve the matching effect.

[0039] The push-pull cylinders B13 are evenly distributed along the length of the top rail 3 to meet the demand for stable lifting and lowering drive of the top rail 3.

[0040] The two branches of the U-shaped bracket 8 are fixedly connected to the suspension main shaft 16 between the middle wheel 15 and the side wheel 14, which is stable and reliable; the dual-output shaft motor 18 is fixedly connected to the two side branches and the bottom of the U-shaped bracket 8 to ensure its stability; the output shafts on both sides of the dual-output shaft motor 18 are also rotatably connected to the two side branches of the U-shaped bracket 8 through bearings to ensure the stability of its power output.

[0041] The support rails 23 are in an inverted L-shaped structure, with two support rails 23 fixed to the front and rear sides of the U-shaped bracket 8. These two support rails 23 are slidably connected to the upper and lower portions of the conveyor housing 2, respectively, at the rack fixing groove 5. When the push-pull cylinder B13 drives the top rail 3 downward to engage the middle wheel 15, the side wheels 14 engage the side guide rails 4, the rack 6 meshes with the gear 17, and the support rails 23 slide in conjunction with the conveyor housing 2, ensuring the stable travel state of the stable travel assembly 19 and achieving a stable fit between the stable travel assembly 19 and the conveyor housing 2.

[0042] The structure of the suspension unit 1 is as follows: The suspension unit 1 includes a push-pull cylinder A9 and a hook 10. The push-pull cylinder A9 is vertically fixed to the outer bottom of the U-shaped bracket 8. The output end of the push-pull cylinder A9 is rotatably mounted with a W-shaped hook 10. The structure and rotational arrangement of the hook 10 facilitate flexible and reliable hanging of the frame and ensure balanced force. The push-pull cylinder A9 can be used to control the lifting and lowering of the frame to meet the requirements of processing displacement. The hook 10 is made of high-strength alloy steel, and the contact surface between the hook 10 and the frame is designed with anti-slip grooves, with a friction coefficient of ≥0.4, to ensure that the frame does not slide or deflect during the lifting process.

[0043] like Figure 2 、 7 -9, as a preferred embodiment of the present invention, the flow conveying device for frame production also includes an adjustable start-stop unit 11 installed on the left and right sides of the U-shaped bracket 8 of the stable travel component 19, and the adjustable start-stop unit 11 includes a fixed panel 12 that is detachably fixed to the U-shaped bracket 8, and an outer cylinder 20 is horizontally fixed on the fixed panel 12, and a touch plate 27 is slidably provided on the inner side of the outer cylinder 20, and an elastic member 26 for elastically supporting the touch plate 27 is also provided in the outer cylinder 20, and an inner core rod 21 that slides out from the end of the outer cylinder 20 is fixed on the side of the touch plate 27 away from the elastic member 26, and a contact disk 22 is fixed on the end of the inner core rod 21 away from the touch plate 27, and a push-pull cylinder C24 is also fixed on the inner side of the outer cylinder 20, and a contact switch 25 that is electrically connected to the dual-output shaft motor 18 and is used to control it is fixed on the output end of the push-pull cylinder C24.

[0044] Preferably, the contact disk 22 adopts a disc-shaped structure, and the corners of the contact disk 22 are rounded; the elastic member 26 adopts a spring, and when there is no external force, under the elastic force of the elastic member 26, the touch plate 27 abuts against the end of the outer cylinder 20 away from the fixed panel 12.

[0045] Preferably, when the contact switch 25 is not triggered, the dual-output shaft motor 18 operates normally; when the contact switch 25 is triggered by the touch plate 27, the dual-output shaft motor 18 stops operating. The triggering logic of the contact switch 25 is as follows: when the contact plate 22 contacts the contact plate 22 of the adjacent stable travel assembly 19, the inner core rod 21 compresses the elastic member 26, and the touch plate 27 moves toward the fixed panel 12 until the contact switch 25 is triggered, at which point the dual-output shaft motor 18 stops operating. When the contact plate 22 disengages, the elastic member 26 returns to its original position, and the dual-output shaft motor 18 restarts.

[0046] Preferably, Figure 8 As shown, when the stable travel component 19 moves to the right, the extension length of the push-pull cylinder C24 of the adjustable start-stop unit 11 on the right side of the stable travel component 19 is greater than the extension length of the push-pull cylinder C24 of the adjustable start-stop unit 11 on the left side of the stable travel component 19, so that the contact switch 25 of the adjustable start-stop unit 11 on the right side of the stable travel component 19 serves as the signal for starting and stopping the dual-output shaft motor 18, while the contact switch 25 of the adjustable start-stop unit 11 on the left side of the stable travel component 19 does not work. Figure 9 As shown, when the stable travel component 19 moves to the left, the extension length of the push-pull cylinder C24 of the adjustable start-stop unit 11 on the right side of the stable travel component 19 is smaller than the extension length of the push-pull cylinder C24 of the adjustable start-stop unit 11 on the left side, so that the contact switch 25 of the adjustable start-stop unit 11 on the left side of the stable travel component 19 serves as a signal for starting and stopping the dual-output shaft motor 18, while the contact switch 25 of the adjustable start-stop unit 11 on the right side of the stable travel component 19 does not work.

[0047] It can be understood that after the contact discs 22 of two adjacent stable travel assemblies 19 collide, the elastic member 26 is compressed, and the touch plate 27 moves accordingly. When the contact switch 25 is triggered, the dual-output shaft motor 18 stops operating, and the stable travel assembly 19 immediately stops moving. This allows the stable travel assembly 19 to automatically start and stop according to the work efficiency of the workstation. When the front stable travel assembly 19 resumes operation, the elastic member 26 of the two adjacent stable travel assemblies 19 extends until the contact discs 22 separate, and the touch plate 27 also releases the trigger state for the contact switch 25, allowing the dual-output shaft motor 18 to continue operating stably and flexibly. In addition, the initial distance between the touch plate 27 and the contact switch 25 can be adjusted by the push-pull cylinder C24, that is, the length of the buffer zone is changed, to achieve adjustable control of the spacing between the two stable travel assemblies 19 after they stop, further adapting to the needs of different working conditions and production processes.

[0048] Stability test of the stable travel assembly 19: A triaxial accelerometer (accuracy ±0.01g) was used to measure the vibration amplitude of the frame during travel. Test conditions: load 1000kg, speed 1.0m / s.

[0049] Table 1 Amplitude test under different vibration directions

[0050]

[0051] It can be seen from Table 1 above that the present invention significantly reduces the vibration amplitude through the multi-point cooperation between the middle wheel 15 and the top rail 3, the side wheel 14 and the side guide rail 4, and the sliding support of the load-bearing rail 23.

[0052] The above embodiment of the present invention provides a flow conveying device for frame production, and its working principle is summarized as follows:

[0053] By controlling the push-pull cylinder B13 to shorten, the stable travel assembly 19 is lifted upward, so that the gear 17 and the rack 6, the conveying shell 2 and the load-bearing rail 23, the top rail 3 and the middle wheel 15, and the side wheel 14 and the side guide rail 4 are separated, thereby achieving quick disassembly and assembly, and facilitating the selection of an appropriate number of stable travel assemblies 19 according to needs.

[0054] The suspension unit 1 includes a push-pull cylinder A9 and a W-shaped hook 10. The push-pull cylinder A9 controls the lifting and lowering of the frame, and the hook 10 structure and its rotation arrangement are used to achieve reliable suspension of the frame and ensure balanced force.

[0055] When push-pull cylinder B13 drives top rail 3 downward to engage center wheel 15, sliding connections are formed between side wheels 14 and side rails 4, rack 6 and gear 17, and support rail 23 and conveyor housing 2, ensuring stable travel of suspension spindle 16. The use of dual-output shaft motor 18 further enhances stability and reliability during travel.

[0056] Furthermore, each stable travel assembly 19 is flanked by an adjustable start-stop unit 11, comprising a contact plate 22, a touch plate 27, an elastic member 26, and a contact switch 25. When two adjacent stable travel assemblies 19 come into contact, the elastic member 26 is compressed, and the touch plate 27 moves, triggering the contact switch 25. This causes the dual-output shaft motor 18 to stop, thereby achieving automatic start and stop of the stable travel assembly 19. By adjusting the extension of the push-pull cylinder C24, the buffer zone length can be varied, thereby adjusting the spacing after stopping to suit different operating conditions.

[0057] In summary, the present invention not only achieves efficient and stable suspension and transportation of the frame, but also provides a convenient maintenance method, and can flexibly adjust the relative positions and operating states of the components according to the specific conditions of the production line, thereby improving the adaptability and flexibility of the entire system.

[0058] The control of each component can be carried out using a PLC controller disclosed in the prior art. The model and circuit connection of each component are not specifically limited and can be flexibly set in actual application.

[0059] The circuits, electronic components and modules involved are all existing technologies and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to software and methods.

[0060] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A conveying device for vehicle frame production, comprising a suspension unit (1) and a conveying shell (2), wherein the suspension unit (1) is used to suspend the vehicle frame and control its lifting and lowering, and the bottom of the conveying shell (2) is provided with a bottom opening (7), characterized in that: Also includes: A controllable track unit, the controllable track unit comprising a top track (3), side guide rails (4) and a push-pull cylinder B (13), the side guide rails (4) being fixed to the front and rear sides of the inner bottom of the conveying shell (2), a plurality of push-pull cylinders B (13) being fixed to the middle of the inner top of the conveying shell (2), and the top track (3) being fixed across the output ends of the plurality of push-pull cylinders B (13); A stable travel component (19) includes a rack (6), a U-shaped bracket (8), a suspension spindle (16), a gear (17) and a dual-output shaft motor (18). The front and rear sides of the bottom opening (7) are provided with a rack fixing groove (5) on the transmission shell (2), and a rack (6) is fixed to the bottom of the rack fixing groove (5); the middle part of the suspension spindle (16) is rotatably installed with a middle wheel (15) capable of cooperating with the top rail (3), and the front and rear sides of the suspension spindle (16) are rotatably installed with a gear (17) capable of cooperating with the two gears. The side guide rails (4) correspond to the side wheels (14); a U-shaped bracket (8) is also fixed on the suspension main shaft (16); a dual-output shaft motor (18) is fixed to the inner bottom of the U-shaped bracket (8); two output ends of the dual-output shaft motor (18) are fixed with gears (17) that can be meshed with two racks (6); the front and rear sides of the U-shaped bracket (8) are also fixed with bearing rails (23) that are slidably connected to the transmission shell (2) on both sides of the bottom opening (7); the suspension unit (1) is installed and fixed to the outer bottom of the U-shaped bracket (8); The suspension unit (1) comprises a push-pull cylinder A (9) and a hook (10); The push-pull cylinder A (9) is vertically fixed to the outer bottom of the U-shaped bracket (8), and a W-shaped hook (10) is rotatably mounted on the output end of the push-pull cylinder A (9); The flow conveying device for frame production also includes adjustable start-stop units (11) installed on the left and right sides of the U-shaped bracket (8) of the stable travel component (19); The adjustable start-stop unit (11) comprises a fixed panel (12) detachably fixedly connected to a U-shaped bracket (8), an outer cylinder (20) being fixed horizontally on the fixed panel (12), a touch plate (27) being slidably provided on the inner side of the outer cylinder (20), an elastic member (26) for elastically supporting the touch plate (27) being further provided in the outer cylinder (20), an inner core rod (21) being slidably extended from an end of the outer cylinder (20) being fixed on a side of the touch plate (27) away from the elastic member (26), and a contact disc (22) being fixed on an end of the inner core rod (21) away from the touch plate (27); A push-pull cylinder C (24) is also fixed on the inner side of the outer cylinder (20), and a contact switch (25) is fixed on the output end of the push-pull cylinder C (24) and is electrically connected to the dual-output shaft motor (18) and used to control it; When the stable travel component (19) moves to the right, the extension length of the push-pull cylinder C (24) of the adjustable start-stop unit (11) on the right side of the stable travel component (19) is greater than the extension length of the push-pull cylinder C (24) of the adjustable start-stop unit (11) on the left side; When the stable travel component (19) moves to the left, the extension length of the push-pull cylinder C (24) of the adjustable start-stop unit (11) on the right side of the stable travel component (19) is smaller than the extension length of the push-pull cylinder C (24) of the adjustable start-stop unit (11) on the left side.

2. The frame production flow conveying device according to claim 1, characterized in that: The structure and size of the middle wheel (15) and the side wheel (14) are the same, and the wheel grooves of the middle wheel (15) and the side wheel (14) are both rounded; The bottom of the top rail (3) and the top of the side rail (4) are both rounded; A plurality of push-pull cylinders B (13) are evenly distributed along the length direction of the top rail (3).

3. The flow conveying device for frame production according to claim 1, characterized in that: The two branches of the U-shaped bracket (8) are fixedly connected to the suspension main shaft (16) between the middle wheel (15) and the side wheel (14); The dual-output shaft motor (18) is fixedly connected to both side branches and the bottom of the U-shaped bracket (8); The output shafts on both sides of the dual-output shaft motor (18) are also rotatably connected to the branches on both sides of the U-shaped bracket (8) through bearings.

4. The frame production flow conveying device according to claim 1, characterized in that: The bearing rails (23) adopt an inverted L-shaped structure, and two bearing rails (23) are fixed on the front and rear sides of the U-shaped bracket (8), and the two bearing rails (23) are correspondingly slidably connected to the upper and lower transmission housings (2) of the rack fixing groove (5); When the push-pull cylinder B (13) drives the top rail (3) to descend and abut against the middle wheel (15), the side wheel (14) abuts against the side guide rail (4), the rack (6) is meshed with the gear (17), and the bearing rail (23) is slidably connected with the transmission housing (2).

5. The frame production flow conveying device according to any one of claims 1 to 4, characterized in that: The contact disk (22) adopts a disc-shaped structure, and the corners of the contact disk (22) are rounded; The elastic member (26) is a spring, and when there is no external force, under the elastic force of the elastic member (26), the touch plate (27) abuts against one end of the outer cylinder (20) away from the fixed panel (12).

6. The transfer conveying device for frame production according to claim 5, characterized in that: When the contact switch (25) is not triggered, the dual-output shaft motor (18) operates normally; When the contact switch (25) is triggered by the touch plate (27), the dual-output shaft motor (18) stops working.

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