A pallet conveyor for automated assembly lines

Abstract

This invention relates to a pallet conveying device for automated assembly lines. The device comprises an upper conveyor line, a first pallet lifting mechanism, a lower conveyor line, and a second pallet lifting mechanism. The upper conveyor line has several pallet transfer mechanisms and several stopping and positioning mechanisms. Pallets are placed on the pallet transfer mechanisms. The stopping and positioning mechanisms are respectively located on the upper conveyor line, with each mechanism corresponding to an operating station. The first pallet lifting mechanism transports the pallet transfer mechanism located at the end of the upper conveyor line to the lower conveyor line. The lower conveyor line has a friction belt conveyor that transports the pallet transfer mechanism to the second pallet lifting mechanism, which then returns the pallet transfer mechanism to the upper conveyor line. Compared with existing technologies, this invention has advantages such as high conveying efficiency, high load-bearing capacity, and stable conveying.

Description

Technical Field

[0001] This invention relates to the field of automated assembly line technology, and in particular to a pallet conveying device for automated assembly lines. Background Technology

[0002] Currently, due to its advantages such as relatively stable conveying and the ability to accumulate materials, many factory automated assembly lines use double-speed chain conveyor pallets. However, since this type of conveying is inherently low-precision, ordinary double-speed chains cannot achieve accurate positioning when precise machining of parts is required.

[0003] At present, the most common method on the double-speed chain is to use the positioning pin of the lifting cylinder to cooperate with the pin sleeve on the pallet for positioning. After this station is completed, the cylinder has to be lowered again. The positioning accuracy of the corresponding station is not high enough to meet the high-precision positioning requirements. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pallet conveying device for automated assembly lines that has high conveying efficiency, high load-bearing capacity, and stable conveying.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A pallet conveying device for an automated assembly line is disclosed, comprising an upper conveyor line, a first pallet lifting mechanism, a lower conveyor line, and a second pallet lifting mechanism. The pallet conveying directions of the upper conveyor line, the first pallet lifting mechanism, the lower conveyor line, and the second pallet lifting mechanism form a pallet return line. The upper conveyor line is equipped with several pallet transfer mechanisms and several stop and position mechanisms. The pallets are mounted on the pallet transfer mechanisms. The stop and position mechanisms are respectively mounted on the upper conveyor line, with each stop and position mechanism corresponding to an operating station. The first pallet lifting mechanism transports the pallet transfer mechanism located at the end of the upper conveyor line to the lower conveyor line. The lower conveyor line is equipped with a friction belt conveyor that transports the pallet transfer mechanism to the second pallet lifting mechanism, which then returns the pallet transfer mechanism to the upper conveyor line.

[0007] Preferably, the pallet includes a pallet body, a pin sleeve, and a cam follower; the pallet body is slidably connected to the upper conveyor line; the cam follower is mounted on the pallet body and its position corresponds to the pallet transfer mechanism; the pin sleeve is mounted on the pallet body and its position corresponds to the stop and positioning mechanism.

[0008] More preferably, the upper conveyor line further includes an upper conveyor line support and a first guide rail; the pallet is slidably connected to the first guide rail; the pallet transfer mechanism is connected to the pallet, and the pallet transfer mechanism drives the pallet to slide along the first guide rail; the pallet transfer mechanism includes a transverse rodless cylinder, a connector, a toggle assembly mounting plate, and a toggle assembly; the transverse rodless cylinder is mounted on the upper conveyor line support; one end of the connector is connected to the output shaft of the transverse rodless cylinder, and the other end is fixed to the toggle assembly mounting plate; the toggle assembly is mounted on the toggle assembly mounting plate; the transverse rodless cylinder drives the toggle assembly mounting plate to drive the toggle assembly to reciprocate.

[0009] More preferably, the actuation assembly includes a push plate, a rotating shaft, a reset spring, a mounting block, and a limiting member; the mounting block is fixed on the actuation assembly mounting plate; the push plate is rotatably connected to the mounting block via the rotating shaft; the reset spring is installed in the direction opposite to the running direction of the upper conveyor line, one end of the reset spring is connected to the actuation assembly mounting plate, and the other end is connected to the push plate; the limiting member is located at the reset spring and is fixed on the actuation assembly mounting plate.

[0010] More preferably, the stop positioning mechanism includes a positioning pin, a stop assembly, a lifting cylinder, a second guide rail, and a stop assembly mounting plate; the lifting cylinder is fixed to the double-layer conveyor support via the cylinder mounting plate; the output shaft of the lifting cylinder is connected to the stop assembly mounting plate; the second guide rail is fixed vertically to the cylinder mounting plate; the stop assembly mounting plate is slidably connected to the second guide rail, and the lifting cylinder drives the stop assembly mounting plate to slide along the second guide rail; the stop assembly and the positioning pin are respectively mounted on the stop assembly mounting plate, the height of the stop assembly is the same as the height of the cam follower, and the position of the positioning pin corresponds to the position of the pin sleeve.

[0011] More preferably, the stop positioning mechanism is provided with a positioning pin fine-tuning component; the positioning pin fine-tuning component is connected to the positioning pin, and the positioning pin fine-tuning component drives the positioning pin to make fine adjustments in the horizontal direction.

[0012] Preferably, the lower conveyor line includes a lower conveyor line support, a friction belt conveyor, a third guide rail, and a follow-up stop mechanism; the friction belt conveyor and the third guide rail are respectively installed on the lower conveyor line support; the pallet is slidably connected to the third guide rail; a nylon wear-resistant strip is fixed on the pallet; the friction belt conveyor drives the pallet to move along the third guide rail through the nylon wear-resistant strip; the follow-up stop mechanism is located at the junction of the lower conveyor line and the second pallet lifting mechanism.

[0013] More preferably, the follow-up stopping mechanism includes a stop block, a pressing member, a spring, a follow-up stopping mechanism mounting plate, and a stop block mounting plate; the stop block and the pressing member are respectively fixed on the stop block mounting plate, the position of the stop block corresponds to the front end of the tray, and the position of the pressing member corresponds to the position of the second tray lifting mechanism. When the second tray lifting mechanism approaches the docking point, it presses the pressing member, and the pressing member drives the stop block to cancel the stopping of the tray.

[0014] Preferably, both the first pallet lifting mechanism and the second pallet lifting mechanism include a lifting mechanism mounting plate, a lifting cylinder, a fourth guide rail, a transfer frame, a docking guide rail, a pallet buffer assembly, and a guide limiting assembly; the lifting cylinder and the fourth guide rail are respectively mounted on the lifting mechanism mounting plate; the transfer frame is slidably connected to the fourth guide rail; the docking guide rail is mounted on the transfer frame through the pallet buffer assembly; and the guide limiting assembly is connected to the docking guide rail.

[0015] More preferably, the pallet buffer assembly includes a docking guide rail mounting plate, a fifth guide rail, and a floating spring; the fifth guide rail is mounted on the transfer frame; the docking guide rail mounting plate is slidably connected to the fifth guide rail; the two ends of the floating spring are respectively connected to the docking guide rail mounting plate and the transfer frame; and the guide limiting assembly is connected to the docking guide rail mounting plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. High conveying efficiency: The pallet conveying device of this invention achieves lateral transfer of the upper conveyor line by cylinder extension and retraction. The pallets of the double-speed chain are conveyed by rolling, but the pallets need to be lifted by the cylinder and then lowered after completion. Moreover, it can save time in RFID reading. Therefore, it can reduce the time for waiting for pallets at the workstation, thereby improving the overall pallet conveying efficiency of the line.

[0018] Second, high load-bearing capacity: The slider on the pallet of the pallet conveying device in this invention is on the guide rail, so the pallet can withstand a large load and impact. Compared with the cylinder lifting and positioning of the double speed chain, the strength is greatly improved.

[0019] 3. Smooth conveying: The pallet conveying device in this invention makes the pallet move linearly on the guide rail by a slider throughout the entire process, which is more stable than the double-speed chain conveying method. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the pallet conveying device in this invention;

[0021] Figure 2 This is a schematic diagram of the upper conveyor line in this invention;

[0022] Figure 3 This is a top view of the upper conveyor line in this invention;

[0023] Figure 4 This is a schematic diagram of the pallet transfer mechanism in this invention;

[0024] Figure 5 This is a schematic diagram of the toggle assembly in this invention.

[0025] Figure 6 This is a schematic diagram of the stop positioning mechanism in this invention;

[0026] Figure 7 This is a schematic diagram of the tray structure in this invention;

[0027] Figure 8 This is a schematic diagram of the lower-level conveyor line in this invention;

[0028] Figure 9 This is a schematic diagram of the follow-up stopping mechanism in this invention;

[0029] Figure 10 This is a schematic diagram of the pallet lifting mechanism in this invention;

[0030] Figure 11 This is a schematic diagram of the tray buffer assembly in this invention.

[0031] The numbers in the diagram are as follows:

[0032] 1. Upper conveyor line; 2. First pallet lifting mechanism; 3. Lower conveyor line; 4. Second pallet lifting mechanism; 5. Pallet;

[0033] 11. Pallet transfer mechanism; 12. Stop and position mechanism; 13. First guide rail;

[0034] 111. Transverse rodless cylinder; 112. Connector; 113. Actuator mounting plate; 114. Push plate; 115. Rotary shaft; 116. Reset spring; 117. Mounting block; 118. Limiting component; 121. Positioning pin; 122. Stop assembly; 123. Lifting cylinder; 124. Second guide rail; 125. Positioning pin fine-tuning assembly.

[0035] 21. Lifting mechanism mounting plate; 22. Lifting cylinder; 23. Fourth guide rail; 24. Transfer frame; 25. Docking guide rail; 26. Pallet buffer assembly; 27. Guide limit assembly.

[0036] 261. Connecting guide rail mounting plate; 262. Fifth guide rail; 263. Floating spring;

[0037] 31. Friction belt conveyor; 32. Third guide rail; 33. Follow-up stop mechanism;

[0038] 331. Stop block; 332. Pressing component; 333. Spring.

[0039] 51. Pallet body; 52. Pin sleeve; 53. Cam follower; 54. Nylon wear-resistant strip. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0041] A pallet conveying device for automated assembly lines, the structure of which is as follows: Figure 1 As shown, the system includes an upper conveyor line 1, a first pallet lifting mechanism 2, a lower conveyor line 3, and a second pallet lifting mechanism 4. The pallet conveying directions of the upper conveyor line 1, the first pallet lifting mechanism 2, the lower conveyor line 3, and the second pallet lifting mechanism 4 form a pallet return line. The upper conveyor line 1 is equipped with several pallet transfer mechanisms 11 and several stop and position mechanisms 12. The conveying pallet 5 is set on the pallet transfer mechanism 11, and the several stop and position mechanisms 12 are respectively set on the upper conveyor line 1. The position of each stop and position mechanism 12 corresponds to an operating station. The first pallet lifting mechanism 2 transports the pallet transfer mechanism 11 located at the end of the upper conveyor line 1 to the lower conveyor line 3. The lower conveyor line 3 is equipped with a friction belt conveyor 31, which transports the pallet transfer mechanism 11 to the second pallet lifting mechanism 4. The second pallet lifting mechanism 4 returns the pallet transfer mechanism 11 to the upper conveyor line 1.

[0042] The following is a detailed description of each institution:

[0043] 1. Pallet 5

[0044] The structure of tray 5 is as follows Figure 7 As shown, the assembly includes a pallet body 51, a pin sleeve 52, a cam follower 53, a nylon wear-resistant strip 54, and an RFID reader. The pallet body 51 is slidably connected to the upper conveyor line 1. The cam follower 53 is mounted on the pallet body 51, corresponding to the pallet transfer mechanism 11. The pin sleeve 52 is mounted on the pallet body 51, corresponding to the stop and positioning mechanism 12. The nylon wear-resistant strip 54 is fixed to the pallet body 51 to provide friction for the friction belt conveyor 31 on the lower conveyor line 3. The RFID reader is fixed to the pallet body 51 and can directly read the model of the fixture for assembly.

[0045] II. Upper Conveyor Line 1

[0046] The structure of the upper conveyor line 1 is as follows: Figure 2 and Figure 3 As shown, it also includes an upper conveyor support and a first guide rail 13. The pallet 5 is slidably connected to the first guide rail 13. The pallet transfer mechanism 11 is connected to the pallet 5. The pallet transfer mechanism 11 drives the pallet 5 to slide along the first guide rail 13.

[0047] The structure of the pallet transfer mechanism 11 is as follows: Figure 4 As shown, it includes a transverse rodless cylinder 111, a connector 112, a toggle assembly mounting plate 113, and a toggle assembly. The transverse rodless cylinder 111 is mounted on the upper conveyor line support. One end of the connector 112 is connected to the output shaft of the transverse rodless cylinder 111, and the other end is fixed to the toggle assembly mounting plate 113. The toggle assembly is mounted on the toggle assembly mounting plate 113. The transverse rodless cylinder 111 drives the toggle assembly mounting plate 113 to drive the toggle assembly to reciprocate.

[0048] The structure of the toggle assembly is as follows Figure 5 As shown, the assembly includes a push plate 114, a rotating shaft 115, a reset spring 116, a mounting block 117, and a limiting member 118. The mounting block 117 is fixed on the actuation component mounting plate 113. The push plate 114 is rotatably connected to the mounting block 117 via the rotating shaft 115. The reset spring 116 is installed in the opposite direction to the running direction of the upper conveyor line 1. One end of the reset spring 116 is connected to the actuation component mounting plate 113, and the other end is connected to the push plate 114. The limiting member 118 is located at the reset spring 116 and is fixed on the actuation component mounting plate 113.

[0049] The structure of the stop positioning mechanism 12 is as follows Figure 6 As shown, the assembly includes a positioning pin 121, a stop assembly 122, a lifting cylinder 123, a second guide rail 124, and a stop assembly mounting plate. The lifting cylinder 123 is fixed to the double-layer conveyor support via the cylinder mounting plate. The output shaft of the lifting cylinder 123 is connected to the stop assembly mounting plate. The second guide rail 124 is fixed vertically to the cylinder mounting plate. The stop assembly mounting plate is slidably connected to the second guide rail 124. The lifting cylinder 123 drives the stop assembly mounting plate to slide along the second guide rail 124. The stop assembly 122 and the positioning pin 121 are respectively mounted on the stop assembly mounting plate. The height of the stop assembly 122 is the same as the height of the cam follower 53. The position of the positioning pin 121 corresponds to the position of the pin sleeve 52.

[0050] The stop positioning mechanism 12 is equipped with a positioning pin fine adjustment component 125, which is connected to the positioning pin 121. The positioning pin fine adjustment component 125 drives the positioning pin 121 to make fine adjustments in the horizontal direction.

[0051] III. Lower Conveyor Line 3

[0052] The structure of the lower conveyor line 3 is as follows Figure 8As shown, it includes a lower conveyor support, a friction belt conveyor 31, a third guide rail 32, and a follow-up stop mechanism 33. The friction belt conveyor 31 and the third guide rail 32 are respectively installed on the lower conveyor support. The tray 5 is slidably connected to the third guide rail 32. A nylon wear-resistant strip 54 is fixed on the tray 5. The friction belt conveyor 31 drives the tray 5 to move along the third guide rail 32 through the nylon wear-resistant strip 54. The follow-up stop mechanism 33 is set at the junction of the lower conveyor line and the second tray lifting mechanism 4.

[0053] The structure of the follow-up stop mechanism 33 is as follows Figure 9 As shown, it includes a stop block 331, a pressing member 332, a spring 333, a follow-up stop mechanism mounting plate, and a stop block mounting plate. The stop block 331 and the pressing member 332 are respectively fixed on the stop block mounting plate. The position of the stop block 331 corresponds to the front end of the tray 5, and the position of the pressing member 332 corresponds to the position of the second tray lifting mechanism 4. When the second tray lifting mechanism 4 approaches the docking point, it presses the pressing member 332, and the pressing member 332 drives the stop block 331 to cancel the stop on the tray 5.

[0054] IV. Pallet Lifting Mechanism

[0055] The first pallet lifting mechanism 2 and the second pallet lifting mechanism 4 have the same structure, such as Figure 10 As shown, each component includes a lifting mechanism mounting plate 21, a lifting cylinder 22, a fourth guide rail 23, a transfer frame 24, a docking guide rail 25, a pallet buffer assembly 26, and a guide limiting assembly 27. The lifting cylinder 22 and the fourth guide rail 23 are respectively mounted on the lifting mechanism mounting plate 21. The transfer frame 24 is slidably connected to the fourth guide rail 23. The docking guide rail 25 is mounted on the transfer frame 24 through the pallet buffer assembly 26. The guide limiting assembly 27 is connected to the docking guide rail 25.

[0056] The structure of the tray cushioning assembly 26 is as follows Figure 11 As shown, it includes a docking guide rail mounting plate 261, a fifth guide rail 262, and a floating spring 263. The fifth guide rail 262 is mounted on the transfer frame 24. The docking guide rail mounting plate 261 is slidably connected to the fifth guide rail 262. The two ends of the floating spring 263 are respectively connected to the docking guide rail mounting plate 261 and the transfer frame 24. The guide limit assembly 27 is connected to the docking guide rail mounting plate 261.

[0057] The working principle of the above-mentioned pallet conveying device is as follows:

[0058] This invention is a closed pallet return line. The upper conveyor line uses a lateral rodless cylinder to push a pusher plate, which in turn moves the pallets. The pusher plate drives a cam follower, thus moving the pallets. Each pallet moves one workstation's distance. Then, a lifting cylinder positions the pallet, and finally, the lateral rodless cylinder retracts. The last pallet is pushed onto the first pallet lifting mechanism by the pusher plate. The lifting cylinder moves the pallet to the lower docking position. When the nylon wear-resistant strip on the pallet touches the friction belt of the lower conveyor line, it causes the pallet to move laterally again. The lower conveyor line has a follower stop mechanism at the end. When the second pallet lifting mechanism descends to the docking position, it engages the mechanical dead stop, and the friction of the friction belt moves the pallet onto the second pallet lifting mechanism. Finally, the lifting cylinder rises to the upper docking position, thus achieving pallet return.

[0059] The following section details how a pallet completes a full process, explaining its working principle:

[0060] When the pallet needs to move forward one station distance, the lifting cylinder 123 retracts, causing the positioning pin 121 and the stop assembly 122 to descend. The positioning pin 121 disengages from the pin sleeve 52 on the pallet 5. Then, the transverse rodless cylinder 111 moves forward, driving the stop positioning mechanism mounting plate 113 to move via the connecting piece 112. The actuating component enables unidirectional pushing. The push plate 114 is mounted on the mounting block 117 via the rotating shaft 115. In this way, the push plate 114 can push the cam follower 53 on the pallet 5 to move to the right by one station distance. The cam follower 53 is mounted on the pallet 5. Just before the push is complete, the lifting cylinder 123 extends, driving the positioning pin 121 and the stop assembly 122 to rise via the second guide rail 124. The stop assembly 122 blocks the front end of the pallet 5, and the positioning pin 121 engages with the pin sleeve 52 on the pallet 5 to precisely position the pallet 5 for high-precision assembly and processing. After the pallet is positioned, the horizontal rodless cylinder 111 moves backward. When the left side of the push plate 114 touches the cam follower 53 on the pallet, the push plate 114 will rotate clockwise around the rotation axis 115 and pass over the cam follower 53. When the push plate 114 passes over the cam follower 53 of the pallet, it will be pulled back to the initial position by the reset spring 116. In this way, the pallet has traveled the distance of one station. After each station has completed the same action, it can enter the first pallet lifting mechanism 2.

[0061] When the first pallet lifting mechanism 2 reaches the upper docking port, the docking guide rail 25 and the first guide rail 13 need to dock, waiting for the pallet. The actuating component pushes the pallet onto the docking guide rail 25. To prevent excessive impact, a pallet buffer component 26 is provided for cushioning. Then, the lifting cylinder 22 slides downward. A fourth guide rail 23 is set vertically. The lifting platform is equipped with a guide limit component 27. When the lifting platform reaches the lower position, it will touch the vertical limit switch. The entire lifting mechanism is installed on the lifting mechanism mounting plate 21. The mechanism can adjust the docking position by adjusting the component. When the lifting platform reaches the lower docking position, the docking guide rail 25 docks with the third guide rail 32, and the nylon wear-resistant strip 54 contacts the friction belt conveyor 31. Under the action of friction, The pallet is transported to the third guide rail 32 of the lower conveyor line 3. The adjustment mechanism can adjust the docking position between the friction belt and the elevator. Driven by the friction belt conveyor 31, the pallet can quickly reach the follow-up stop position. Under normal circumstances, if the second pallet lifting mechanism 4 does not reach the docking position, the bottom pallet is blocked at the follow-up stop mechanism and cannot pass. When the second pallet lifting mechanism 4 descends to the docking position, the pressing part 332 is pressed down, and the stop block 331 is also pressed down. Driven by the friction belt conveyor 31, the pallet can smoothly enter the second pallet lifting mechanism 4. After the lifting platform rises, under the action of the spring 333, the follow-up stop mechanism 33 returns to the top position, and the stop block 331 can block the next pallet. The inductive positioning switch is a sensor that detects whether the pallet has been pressed into position. The second pallet lifting mechanism 4 has the same function as the first pallet lifting mechanism 2. The lifting cylinder 22 rises and is lifted by the lifting platform through the fourth guide rail 23. The docking guide rail 25 docks with the first guide rail 13 and the third guide rail 32 at the upper and lower docking positions, respectively. The guide limit component 27 is a guide in the upper and lower directions. The vertical travel switch is a sensor for the position. The vertical movement buffer plays a role in buffering the upper and lower directions. The entire lifting platform is installed on the lifting mechanism mounting plate 21. The position can be adjusted by adjusting the mechanism. Finally, the pallet can return to the initial work position, realizing the function of pallet return.

[0062] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A pallet conveying device for an automated assembly line, used for conveying pallets (5), characterized in that, The pallet conveying device includes an upper conveyor line (1), a first pallet lifting mechanism (2), a lower conveyor line (3), and a second pallet lifting mechanism (4); the pallet conveying directions of the upper conveyor line (1), the first pallet lifting mechanism (2), the lower conveyor line (3), and the second pallet lifting mechanism (4) form a pallet return line; the upper conveyor line (1) is equipped with several pallet transfer mechanisms (11) and several stop and positioning mechanisms (12); the pallet (5) is set on the pallet transfer mechanism (11); the several stop and positioning mechanisms (12) 12) Each stop and positioning mechanism (12) is set on the upper conveyor line (1), and the position of each stop and positioning mechanism (12) corresponds to an operating station; the first pallet lifting mechanism (2) transports the pallet transfer mechanism (11) located at the end of the upper conveyor line (1) to the lower conveyor line (3); the lower conveyor line (3) is equipped with a friction belt conveyor (31), which transports the pallet transfer mechanism (11) to the second pallet lifting mechanism (4), and the second pallet lifting mechanism (4) returns the pallet transfer mechanism (11) to the upper conveyor line (1); The pallet (5) includes a pallet body (51), a pin sleeve (52), and a cam follower (53); the pallet body (51) is slidably connected to the upper conveyor line (1); the cam follower (53) is mounted on the pallet body (51) and its position corresponds to the pallet transfer mechanism (11); the pin sleeve (52) is mounted on the pallet body (51) and its position corresponds to the stop positioning mechanism (12); The upper conveyor line (1) further includes an upper conveyor line bracket and a first guide rail (13); the tray (5) is slidably connected to the first guide rail (13); the tray transfer mechanism (11) is connected to the tray (5), and the tray transfer mechanism (11) drives the tray (5) to slide along the first guide rail (13); the tray transfer mechanism (11) includes a transverse rodless cylinder (111), a connector (112), a toggle assembly mounting plate (113), and a toggle assembly; the transverse rodless cylinder (111) is mounted on the upper conveyor line bracket; one end of the connector (112) is connected to the output shaft of the transverse rodless cylinder (111), and the other end is fixed with the toggle assembly mounting plate (113); the toggle assembly is mounted on the toggle assembly mounting plate (113); the transverse rodless cylinder (111) drives the toggle assembly mounting plate (113) to drive the toggle assembly to reciprocate; The actuation assembly includes a push plate (114), a rotating shaft (115), a reset spring (116), a mounting block (117), and a limiting member (118). The mounting block (117) is fixed on the actuation assembly mounting plate (113). The push plate (114) is rotatably connected to the mounting block (117) via the rotating shaft (115). The reset spring (116) is installed in the opposite direction to the running direction of the upper conveyor line (1), with one end of the reset spring (116) connected to the actuation assembly mounting plate (113) and the other end connected to the push plate (114). The limiting member (118) is located at the reset spring (116) and is fixed on the actuation assembly mounting plate (113). The stop positioning mechanism (12) includes a positioning pin (121), a stop assembly (122), a lifting cylinder (123), a second guide rail (124), and a stop assembly mounting plate. The lifting cylinder (123) is fixed on the double-layer conveyor support via the cylinder mounting plate. The output shaft of the lifting cylinder (123) is connected to the stop assembly mounting plate. The second guide rail (124) is fixed on the cylinder mounting plate in the vertical direction. The stop assembly mounting plate is slidably connected to the second guide rail (124), and the lifting cylinder (123) drives the stop assembly mounting plate to slide along the second guide rail (124). The stop assembly (122) and the positioning pin (121) are respectively mounted on the stop assembly mounting plate. The height of the stop assembly (122) is the same as the height of the cam follower (53), and the position of the positioning pin (121) corresponds to the position of the pin sleeve (52). The stop positioning mechanism (12) is provided with a positioning pin fine adjustment component (125); the positioning pin fine adjustment component (125) is connected to the positioning pin (121), and the positioning pin fine adjustment component (125) drives the positioning pin (121) to make fine adjustments in the horizontal direction.

2. The pallet conveying device for an automated assembly line according to claim 1, characterized in that, The lower conveyor line (3) includes a lower conveyor line support, a friction belt conveyor (31), a third guide rail (32), and a follow-up stop mechanism (33); the friction belt conveyor (31) and the third guide rail (32) are respectively installed on the lower conveyor line support; the tray (5) is slidably connected to the third guide rail (32); a nylon wear-resistant strip (54) is fixed on the tray (5); the friction belt conveyor (31) drives the tray (5) to move along the third guide rail (32) through the nylon wear-resistant strip (54); the follow-up stop mechanism (33) is set at the junction of the lower conveyor line and the second tray lifting mechanism (4).

3. A pallet conveying device for an automated assembly line according to claim 2, characterized in that, The following stop mechanism (33) includes a stop block (331), a pressing member (332), a spring (333), a following stop mechanism mounting plate, and a stop block mounting plate. The stop block (331) and the pressing member (332) are respectively fixed on the stop block mounting plate. The position of the stop block (331) corresponds to the front end of the tray (5), and the position of the pressing member (332) corresponds to the position of the second tray lifting mechanism (4). When the second tray lifting mechanism (4) approaches the docking point, it presses the pressing member (332), and the pressing member (332) drives the stop block (331) to cancel the stop of the tray (5).

4. A pallet conveying device for an automated assembly line according to claim 1, characterized in that, The first pallet lifting mechanism (2) and the second pallet lifting mechanism (4) both include a lifting mechanism mounting plate (21), a lifting cylinder (22), a fourth guide rail (23), a transfer frame (24), a docking guide rail (25), a pallet buffer assembly (26), and a guide limiting assembly (27). The lifting cylinder (22) and the fourth guide rail (23) are respectively mounted on the lifting mechanism mounting plate (21). The transfer frame (24) is slidably connected to the fourth guide rail (23). The docking guide rail (25) is mounted on the transfer frame (24) through the pallet buffer assembly (26). The guide limiting assembly (27) is connected to the docking guide rail (25).

5. A pallet conveying device for an automated assembly line according to claim 4, characterized in that, The pallet buffer assembly (26) includes a docking guide rail mounting plate (261), a fifth guide rail (262), and a floating spring (263); the fifth guide rail (262) is mounted on the transfer frame (24); the docking guide rail mounting plate (261) is slidably connected to the fifth guide rail (262); the two ends of the floating spring (263) are respectively connected to the docking guide rail mounting plate (261) and the transfer frame (24); the guide limiting assembly (27) is connected to the docking guide rail mounting plate (261).

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