A circulating tray transport mechanism

Abstract

The utility model provides a kind of circulation formula tray transport mechanism, including first conveying mechanism, second conveying mechanism and tray, the input end and output end of first conveying mechanism are vertically connected in the side of second conveying mechanism, and it is enclosed to form annular conveying mechanism, it is characterized in that, the transport surface of first conveying mechanism is set in first plane, the transport surface of second conveying mechanism is set in second plane, second plane is lower than first plane, the input end and output end of first conveying mechanism are provided with steering mechanism, steering mechanism includes liftable lifting frame, and steering conveyor belt and blocker being set on lifting frame, blocker is towards the input end of steering mechanism, steering conveyor belt is perpendicular to second conveying mechanism, tray is circulated on first conveying mechanism and second conveying mechanism by the steering conveyor belt of lifting, after the posture of tray is adjusted by first steering mechanism and second steering mechanism, accurate steering, effectively eliminate the accumulated error generated in the process of tray turning.

Description

Technical Field

[0001] This utility model relates to the field of conveying equipment technology, and in particular to a circulating pallet transport mechanism. Background Technology

[0002] Heliostats are the core concentrating components of tower solar thermal power generation systems. Their function is to track the sun's position in real time through a high-precision array of reflective mirrors, reflecting and focusing solar radiation energy onto a receiver at the top of the solar collector tower.

[0003] Heliostats consist of a heliostat backplate and heliostat lenses. Traditional heliostat production processes rely on manual labor and have a low degree of automation. To improve the automation level of heliostat production, trays are currently used to assemble lenses and backplates. First, the lenses are placed in the tray with the back side facing up, and then the heliostat backplate is glued to the lenses.

[0004] Given the large size of heliostats, using conventional circulating conveyor belts, with their semi-circular ends, would further increase the belt width and require a large floor space for the entire production line. This makes it difficult to install a complete production line in some smaller factories. Furthermore, when traditional circulating conveyor belts transport pallets, accumulated errors can easily occur during pallet turns, resulting in poor accuracy in the pallet's movement trajectory, which is insufficient to meet the demands of high-precision processing. Utility Model Content

[0005] To address the problem of accumulated errors during pallet turning in traditional circulating pallet conveyors, this invention provides a circulating pallet transport mechanism, comprising a first conveyor mechanism, a second conveyor mechanism, and a pallet. The input and output ends of the first conveyor mechanism are perpendicularly connected to one side of the second conveyor mechanism, forming a ring-shaped conveyor mechanism. The transport surface of the first conveyor mechanism is located on a first plane, and the transport surface of the second conveyor mechanism is located on a second plane, which is lower than the first plane. A turning mechanism is provided at the input and output ends of the first conveyor mechanism. The turning mechanism includes a liftable lifting frame, a turning conveyor belt mounted on the lifting frame, and a stopper. The stopper faces the input end of the turning mechanism, and the turning conveyor belt is perpendicular to the second conveyor mechanism. The pallet is circulated between the first and second conveyor mechanisms via the lifting turning conveyor belt.

[0006] Specifically, the first conveying mechanism includes a second steering conveying mechanism, a first linear conveying mechanism, and a first steering conveying mechanism connected in sequence. The first steering conveying mechanism and the second steering conveying mechanism are 90° roller conveyor belts, and the second conveying mechanism is a second linear conveying mechanism.

[0007] Specifically, the input end of the first steering conveyor is connected to the output end of the first linear conveyor; the output end of the first steering conveyor is perpendicular to the second linear conveyor; the input end of the second steering conveyor is perpendicular to the second linear conveyor; and the output end of the second steering conveyor is connected to the input end of the first linear conveyor.

[0008] Specifically, the tray includes a tray body, a bearing surface disposed on the tray body, and a base disposed at the bottom of the tray body. The base is a square frame structure. Each side of the base is provided with a centrally symmetrical staggered groove, and the staggered grooves on opposite sides are staggered. The four corners of the base are provided with clearance grooves.

[0009] Specifically, the steering mechanism includes a first steering mechanism disposed at the output end of the first conveying mechanism and a second steering mechanism disposed at the input end of the first conveying mechanism.

[0010] Specifically, the first steering mechanism includes a first base frame fixedly installed in the second conveying mechanism. The first base frame is provided with a first lifting cylinder with a piston rod pointing vertically upward. A first pallet lifting frame is provided on the piston rod of the first lifting cylinder. The first pallet lifting frame is provided with a first steering conveyor belt that matches the movement direction of the first steering conveying mechanism. A first stopper is provided on the side of the first pallet lifting frame near the first steering conveying mechanism. The first stopper is located at the misalignment groove on the front side of the pallet.

[0011] Specifically, the second steering mechanism includes a second base frame fixedly installed in the second conveying mechanism. The second base frame is provided with a second lifting cylinder with a piston rod pointing vertically upward. A second lifting frame is provided on the piston rod of the second lifting cylinder. The second lifting frame is provided with a second steering conveyor belt that matches the movement direction of the second steering conveying mechanism. The second lifting frame is provided with a second stopper facing the input end of the second linear conveying mechanism. The second stopper is located at the misalignment groove on the front side of the tray.

[0012] Specifically, the second conveying mechanism is provided with multiple lifting stops at equal intervals.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. The circulating pallet transport mechanism of this utility model adopts a first linear conveyor mechanism, a first steering conveyor mechanism, a second linear conveyor mechanism, and a second steering conveyor mechanism connected in sequence to transport pallets in a circular manner. The first steering mechanism and the second steering mechanism are set in the second linear conveyor mechanism. After the pallet is adjusted by the first steering mechanism and the second steering mechanism, it is accurately turned, effectively eliminating the cumulative error generated during the pallet turning process.

[0015] 2. The first and second steering conveying mechanisms of this utility model adopt 90° roller conveyor belts, which significantly reduces the floor space occupied by the circular conveyor mechanism compared with conventional circular conveyor belts.

[0016] 3. This utility model provides a damping stopper in the first steering mechanism and the second steering mechanism to stop the tray. The tray slowly stops in the steering mechanism to avoid hard contact stopping of the tray and damage to the tray and the heliostat in the tray. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the first steering mechanism of this utility model;

[0019] Figure 3 This is a schematic diagram of the second steering mechanism of this utility model;

[0020] Figure 4 This is a schematic diagram of the first direction structure of the tray of this utility model;

[0021] Figure 5 This is a schematic diagram of the second direction structure of the tray of this utility model.

[0022] Reference numerals: 31, First linear conveyor mechanism; 311, First proximity sensor; 32, First steering conveyor mechanism; 33, Second linear conveyor mechanism; 34, Second steering conveyor mechanism; 35, First steering mechanism; 351, First base frame; 352, First lifting cylinder; 353, First pallet lifting frame; 354, First steering conveyor belt; 355, First stopper; 356, First stop block; 357, First positioning wall; 358, Second proximity sensor; 36, Lifting stopper; 361, First... 37. Three proximity sensors; 38. Second steering mechanism; 39. Second base frame; 30. Second lifting cylinder; 31. Second lifting frame; 32. Second steering conveyor belt; 33. Second stopper; 34. Second stop block; 35. Second positioning wall; 36. Fourth proximity sensor; 47. Tray; 41. Tray body; 42. Bearing surface; 421. Corner positioning block; 423. Detector block; 424. Anti-collision block; 43. Chassis; 431. Clearance groove; 432. Misalignment groove; 433. Tray positioning block. Detailed Implementation

[0023] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0024] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] like Figures 1-5 As shown, this utility model provides a circulating pallet transport mechanism, including a first conveying mechanism, a second conveying mechanism and a pallet 4. The input end and output end of the first conveying mechanism are vertically connected to one side of the second conveying mechanism, forming a ring conveying mechanism. The pallet 4 is stopped and precisely turned by a steering mechanism located in the second conveying mechanism and at the input end and output end of the first conveying mechanism.

[0026] This circulating conveyor mechanism is used for the automatic assembly of heliostats. Around the circulating conveyor mechanism, there are sequentially arranged lens loading robotic arms, glue application robotic arms, backplate loading robotic arms, and transfer robotic arms. The lens loading robotic arm picks up the lens and transfers it to the tray 4 with the back side facing up. The tray 4 carries the lens and moves along the circulating conveyor mechanism. The glue application robotic arm applies glue to the glue application points on the back of the lens. The backplate loading robotic arm aligns the glued part of the backplate with the glue application points and places it on the back of the lens. The tray 4 carries the assembled heliostat and moves along the circulating conveyor mechanism, allowing the glue to gradually solidify during the movement. The tray 4 is transported to the transfer robotic arm, which removes the lens from the tray 4. The tray 4 continues to circulate in the circulating conveyor mechanism, thereby achieving high-precision assembly of the heliostat lens and the backplate.

[0027] The first conveying mechanism includes a second steering conveyor 34, a first linear conveyor 31, and a first steering conveyor 32 connected in sequence. The first linear conveyor 31 is a top-roller chain conveyor belt with top-roller chains on both sides. The first steering conveyor 32 and the second steering conveyor 34 are 90° roller conveyor belts. Straight sections are provided at both the input and output ends of the first steering conveyor 32 and the second steering conveyor 34 to provide a smooth transition for the movement of the pallet 4 and prevent the pallet 4 from deviating. The second conveying mechanism is a second linear conveyor 33, which is also a top-roller chain conveyor belt with top-roller chains on both sides.

[0028] The first linear conveyor 31 is driven by a first drive device, the first steering conveyor 32 is driven by a second drive device, the second linear conveyor 33 is driven by a third drive device, and the second steering conveyor 34 is driven by a fourth drive device. The input end of the first steering conveyor 32 is connected to the output end of the first linear conveyor 31, and the output end of the first steering conveyor 32 is perpendicular to the second linear conveyor 33; the input end of the second steering conveyor 34 is perpendicular to the second linear conveyor 33, and the output end of the second steering conveyor 34 is connected to the input end of the first linear conveyor 31.

[0029] The tray 4 is placed in the conveying mechanism and includes a tray body 41. A bearing surface 42 is provided on the tray body 41, and the size of the bearing surface 42 is larger than the size of the tray body 41. The bearing surface 42 is rectangular, and corner positioning blocks 421 are provided at the four corners of the bearing surface 42 to limit the movement of the lens. A guide slope is provided on the inner side of the corner positioning blocks 421.

[0030] The bottom of the pallet 41 is provided with a chassis 43, which is a square frame structure made of rubber. Limiting walls are provided on both sides of the conveying mechanism, and the width of the chassis 43 matches the width of the limiting walls to prevent the pallet 4 from shifting during transportation. Symmetrical offset grooves 432 are provided on each side of the chassis 43, with the offset grooves 432 on two opposite sides of the chassis 43 staggered. This allows the stopper controlling the pallet 4 to pass through the front end of the pallet 4 and stop it from the inside during turning. Clearance grooves 431 are provided at the four corners of the chassis 43 to allow the chassis 43 to make way for the blocks that restrict the position of the pallet 4 when turning. Since the pallet 4 rotates 180° for each revolution in the conveying mechanism, clearance grooves 431 are provided at the four corners of the chassis 43, and centrally symmetrical misalignment grooves 432 are provided on each side of the chassis 43. When the pallet 4 passes through the stopper in different orientations, the stopper can pass through the misalignment grooves 432.

[0031] A tray positioning block 433 is provided at the bottom of the tray body 41, located at the four corners of the inner side of the frame structure of the chassis 43. The tray positioning block 433 has a groove for positioning the tray 4 on the lifting platform. On the bottom edge of the bearing surface 42 along its length, there are symmetrically arranged inverted detection blocks 423. The detection blocks 423 act as proximity sensors to detect targets. A collision protection block 424 is provided on the outside of the detection blocks 423. If the trays 4 collide due to an accident, the collision protection block 424 absorbs the collision kinetic energy through elastic deformation, preventing the trays 4 from directly contacting each other and causing structural damage.

[0032] The steering mechanism includes a first steering mechanism 35 disposed at the output end of the first conveying mechanism and a second steering mechanism 37 disposed at the input end of the first conveying mechanism.

[0033] The first steering mechanism 35 includes a first base frame 351 fixedly installed in the second linear conveyor mechanism 33. First lifting cylinders 352 are located at the four corners of the first base frame 351. A first pallet lifting frame 353 is mounted on the piston rod of the first lifting cylinder 352. A first steering conveyor belt 354 is installed within the first pallet lifting frame 353, with the first steering conveyor belt 354 positioned opposite each other on both sides of the first pallet lifting frame 353. The movement direction and speed of the first steering conveyor belt 354 match the movement direction of the first steering conveyor mechanism 32 and are perpendicular to the second linear conveyor mechanism 33. A fifth driving device drives the first steering conveyor belt 354 to rotate synchronously with the first steering conveyor mechanism 32, moving the pallet 4 from the first steering conveyor mechanism 32 onto the first steering conveyor belt 354. The initial position of the first pallet lifting frame 353 is below the second linear conveyor mechanism 33. After the first lifting cylinders 352 lift the first pallet lifting frame 353, it becomes flush with the first steering conveyor mechanism 32.

[0034] A stopper is provided on the first pallet lifting frame 353 facing the input end of the steering mechanism. The stopper is used to stop the pallet 4. The stopper can be a blocking block located on the side of the first base frame 351 away from the first steering conveyor mechanism 32. To reduce the impact and vibration caused when the pallet 4 is stopped, as a preferred embodiment of this utility model, a first stopper 355 is provided on the side of the first pallet lifting frame 353 near the first steering conveyor mechanism 32. The first stopper 355 is located between the two conveyor belts of the first steering mechanism 35. The first stopper 355 is a damping stopper, with its piston rod facing the first steering conveyor mechanism 32. A first stop block 356 is provided at the piston rod of the first stopper 355. The height of the first stop block 356 is higher than the height of the first steering conveyor belt 354, which is used to limit the movement distance of the pallet 4 in the first steering mechanism 35. The first stop block 356 is disposed at the misalignment groove 432 on the front side of the pallet 4. The first stop block 356 can pass through the misalignment groove 432 on the front side of the pallet 4 and block the pallet 4 from the inside, stopping the pallet 4. On both sides of the first steering conveyor belt 354, there are first positioning walls 357. The first positioning wall 357 at the input end of the first steering mechanism 35 is provided with a guide slope. The distance between the two first positioning walls 357 matches the distance of the pallet 4, so as to correct and limit the deviation of the pallet 4.

[0035] A first proximity sensor 311 is installed at the entrance of the first steering conveyor mechanism 32. The position of the first proximity sensor 311 matches the position of the detection block 423. When the pallet 4 passes the first proximity sensor 311, the first proximity sensor 311 detects the passage of the detection block 423 and sends an electrical signal to the controller, causing the piston rod of the first lifting cylinder 352 to extend and lift the first pallet lifting frame 353, while simultaneously activating the first steering conveyor belt 354. On the side of the second linear conveyor mechanism 33 away from the first steering conveyor mechanism 32, a second proximity sensor 358 is installed. When the detection block 423 of the pallet 4 moves onto the second proximity sensor 358, the pallet 4 has completely moved onto the first steering conveyor belt 354. The first stop block 356 stops the pallet 4 from the inside. The controller controls the first steering conveyor belt 354 to stop moving and controls the piston rod of the first lifting cylinder 352 to descend, causing the pallet 4 to descend into the second linear conveyor mechanism 33. The pallet 4 then moves laterally along the second linear conveyor mechanism 33.

[0036] After leaving the first steering mechanism 35, the pallet 4 enters the second linear conveying mechanism 33. Multiple lifting stoppers 36 are evenly arranged in the second linear conveying mechanism 33. Each lifting stopper 36 has a vertically arranged piston rod driven by air pressure, which can extend upward, and a horizontally arranged damper. The piston rod of the damper faces the feeding direction and stops the pallet 4 by damping. This lifting stopper 36 is existing technology, and its internal structure will not be described in detail here. Outside the second linear conveying mechanism 33, a corresponding third proximity sensor 361 is provided next to each lifting stop 36. When the detection block 423 of the tray 4 moves to the third proximity sensor 361, the piston rod of the lifting stop 36 extends to raise the damper, which causes the tray 4 to stop slowly. When the subsequent tray 4 arrives, the lifting stop 36 releases the obstruction of the front tray 4 in sequence from front to back through cascade control, allowing the trays 4 to pass in sequence, thereby extending the dwell time of the heliostat in the primary curing section. The adhesive naturally cures during the slow transport in the primary curing section, improving the adhesion between the backplate and the lens.

[0037] The pallet 4 is then transported to the pallet 4 positioning mechanism located in the second linear conveyor mechanism 33. The pallet 4 positioning mechanism stops and lifts the pallet 4, and the robotic arm removes the glued heliostat from the pallet 4. After removal, the pallet 4 moves along the second linear conveyor mechanism 33 to the second steering mechanism 37, which is located between the two top roller chains of the second linear conveyor mechanism 33, causing the pallet 4 to turn.

[0038] The second steering mechanism 37 includes a second base frame 371 fixedly installed in the second linear conveying mechanism 33. A second lifting cylinder 372 is provided at the four corners of the second base frame 371. A second lifting frame 373 is provided on the piston rod of the second lifting cylinder 372. A second steering conveyor belt 374 is provided in the second lifting frame 373. The second steering conveyor belt 374 is arranged opposite to each other on both sides of the second lifting frame 373. The movement direction and conveying speed of the second steering conveyor belt 374 are matched with the second steering conveying mechanism 34. The movement direction is perpendicular to the second linear conveying mechanism 33. The pallet 4 is moved from the second linear conveying mechanism 33 to the second steering conveying mechanism 34 under the drive of the sixth driving device.

[0039] A second stopper 375 is provided in the second lifting frame 373. The second stopper 375 is a damping stopper, located between the two top roller conveyor belts of the second linear conveyor mechanism 33. A second stop 376 is provided at the piston rod of the second stopper 375. The second stop 376 is located at the misalignment groove 432 on the front side of the tray 4. The piston rod of the second stopper 375 is oriented towards the feeding direction to limit the movement distance of the tray 4 in the second linear conveyor mechanism 33. Second positioning walls 377 are provided on both sides of the second turning conveyor belt 374. The distance between the two second positioning walls 377 matches the side length of the chassis 43 to limit the movement of the tray 4. When the piston rod of the second stopper 375 is in the compressed state, the distance between the second stop 376 and the second positioning wall 377 matches the width of the frame chassis 43. When the tray 4 moves into position, the bottom frame of the tray 4 is precisely positioned above the second turning conveyor belt 374.

[0040] When the second lifting frame 373 is at the initial height, the height of the second steering conveyor belt 374 is lower than the height of the second linear conveyor mechanism 33, and the height of the second stop block 376 is higher than the height of the second linear conveyor mechanism 33. When the second lifting frame 373 is at the second height, the height of the second steering conveyor belt 374 is flush with the height of the second steering conveyor mechanism 34. A fourth proximity sensor 378 is provided at the front end of the second steering conveyor belt 374 and on the outside of the second linear conveyor mechanism 33. The fourth proximity sensor 378 is electrically connected to the controller. When the fourth proximity sensor 378 detects the detection block 423 located in front of the tray 4, it sends an electrical signal to the controller to control the second lifting cylinder 372 to raise the second lifting frame 373 to the second height. Subsequently, the sixth drive device drives the second steering conveyor belt 374 to rotate synchronously with the second steering conveyor mechanism 34, transferring the tray 4 into the second steering conveyor mechanism 34. When the second steering conveyor belt 374 turns the tray 4, the second stop block 376 avoids colliding with the chassis 43 because a clearance groove 431 is provided at the bottom of the tray 4.

[0041] The second steering conveyor 34 turns the pallet 4 90°, changing it from longitudinal to lateral transport, and moves it to the first linear conveyor 31. The pallet 4 completes one cycle of transport via the first linear conveyor 31, the first steering conveyor 32, the second linear conveyor 33, and the second steering conveyor 34.

[0042] In use, after the pallet 4 passes through the first linear conveyor mechanism 31, the first lifting cylinder 352 raises the first pallet lifting frame 353 and starts the first steering conveyor belt 354. After passing through the first steering conveyor mechanism 32, the pallet 4 enters the first steering mechanism 35. The first stop block 356 passes through the misalignment groove 432 on the front side of the pallet 4 and stops the pallet 4 from the inside of the chassis 43. The first steering conveyor belt 354 stops moving, and then the first pallet lifting frame 353 lowers, and the pallet 4 falls onto the second linear conveyor mechanism 33. The pallet 4 moves along the second linear conveyor mechanism 33 to the second steering mechanism 35. On mechanism 37, the second stop 376 passes through the misalignment groove 432 on the front side of the pallet 4 and stops the pallet 4 from the inside of the chassis 43. Then, the second lifting frame 373 raises the pallet 4 to be flush with the second steering mechanism 37. The second steering conveyor belt 374 starts to transfer the pallet 4 to the second steering conveyor mechanism 34. After the pallet 4 moves to the second steering conveyor mechanism 34, the second steering conveyor belt 374 stops moving. Then, the second lifting frame 373 lowers, and the pallet 4 moves along the second steering conveyor mechanism 34 and returns to the first linear conveyor mechanism 31. The pallet 4 completes one cycle of transportation.

[0043] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A circulating pallet transport mechanism, comprising a first conveying mechanism, a second conveying mechanism, and a pallet (4), wherein the input end and output end of the first conveying mechanism are perpendicularly connected to one side of the second conveying mechanism, forming a ring-shaped conveying mechanism, characterized in that, The transport surface of the first conveying mechanism is set on the first plane, and the transport surface of the second conveying mechanism is set on the second plane. The second plane is lower than the first plane. The input end and output end of the first conveying mechanism are provided with a turning mechanism. The turning mechanism includes a liftable lifting frame, a turning conveyor belt and a stopper set on the lifting frame. The stopper faces the input end of the turning mechanism. The turning conveyor belt is perpendicular to the second conveying mechanism. The pallet (4) is transported cyclically on the first conveying mechanism and the second conveying mechanism via the lifting turning conveyor belt.

2. The circulating pallet transport mechanism according to claim 1, characterized in that, The first conveying mechanism includes a second steering conveying mechanism (34), a first linear conveying mechanism (31) and a first steering conveying mechanism (32) connected in sequence. The first steering conveying mechanism (32) and the second steering conveying mechanism (34) are 90° roller conveyor belts, and the second conveying mechanism is a second linear conveying mechanism (33).

3. The circulating pallet transport mechanism according to claim 2, characterized in that, The input end of the first steering conveying mechanism (32) is connected to the output end of the first linear conveying mechanism (31). The output end of the first steering conveying mechanism (32) is perpendicular to the second linear conveying mechanism (33). The input end of the second steering conveying mechanism (34) is perpendicular to the second linear conveying mechanism (33). The output end of the second steering conveying mechanism (34) is connected to the input end of the first linear conveying mechanism (31).

4. The circulating pallet transport mechanism according to claim 1, characterized in that, The tray (4) includes a tray body (41), a bearing surface (42) provided on the tray body (41), and a base plate (43) provided at the bottom of the tray body (41). The base plate (43) is a square frame structure. Each side of the base plate (43) is provided with a centrally symmetrical offset groove (432). The offset grooves (432) on opposite sides are staggered. The four corners of the base plate (43) are provided with clearance grooves (431).

5. The circulating pallet transport mechanism according to claim 2, characterized in that, The steering mechanism includes a first steering mechanism (35) disposed at the output end of the first conveying mechanism and a second steering mechanism (37) disposed at the input end of the first conveying mechanism.

6. The circulating pallet transport mechanism according to claim 5, characterized in that, The first steering mechanism (35) includes a first base frame (351) fixedly installed in the second conveying mechanism. The first base frame (351) is provided with a first lifting cylinder (352) with the piston rod pointing vertically upward. The piston rod of the first lifting cylinder (352) is provided with a first pallet lifting frame (353). The first pallet lifting frame (353) is provided with a first steering conveyor belt (354) that matches the movement direction of the first steering conveying mechanism (32). The first pallet lifting frame (353) is provided with a first stopper (355) on the side near the first steering conveying mechanism (32). The first stopper (355) is located at the misalignment groove (432) on the front side of the pallet (4).

7. The circulating pallet transport mechanism according to claim 5, characterized in that, The second steering mechanism (37) includes a second base frame (371) fixedly installed in the second conveying mechanism. The second base frame (371) is provided with a second lifting cylinder (372) with the piston rod pointing vertically upward. The piston rod of the second lifting cylinder (372) is provided with a second lifting frame (373). The second lifting frame (373) is provided with a second steering conveyor belt (374) that matches the movement direction of the second steering conveying mechanism (34). The second lifting frame (373) is provided with a second stopper (375) facing the input end of the second linear conveying mechanism (33). The second stopper (375) is located at the misalignment groove (432) on the front side of the tray (4).

8. The circulating pallet transport mechanism according to claim 1, characterized in that, The second conveying mechanism is provided with multiple lifting stops (36) at equal intervals.

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