Automatic tray loading and unloading machine with double-layer conveying channel switching structure

Abstract

The invention relates to the technical field of conveying equipment, and discloses an automatic tray loading and unloading machine with a double-layer conveying channel switching structure. The machine frame is detachably installed on one side of a feeding port of the conveying frame, the machine frame is slidably connected with a lifting table through a telescopic unit arranged in the machine frame, the lifting table is rotatably connected with a switching circular plate through a driving unit arranged in the lifting table, and a groove hole is formed in the upper surface of the switching circular plate. A limiting assembly used for limiting the tray is arranged on the lower portion of the switching circular plate and comprises a supporting frame. The automatic tray loading and unloading machine with the double-layer conveying channel switching structure can effectively solve the problems that in the prior art, when a tray is subjected to channel switching, due to the movement of a lifting platform and the influence of a guiding device, the tray shakes or deviates, the tray collides with the edge of a channel, and then the tray and equipment are damaged; the normal operation of the equipment is influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of conveying equipment, and in particular to an automatic pallet loading and unloading machine with a double-layer conveying channel switching structure. Background Art

[0002] The automatic pallet loader and unloader is a highly automated logistics equipment designed to achieve fast and efficient loading and unloading of palletized goods. It can significantly reduce manual labor intensity and improve the accuracy and efficiency of logistics operations. It is widely used in factories, warehouses, logistics centers and other places. Through advanced mechanical structure and automated control system, this equipment realizes a series of automated operations from pallet handling, positioning to cargo loading and unloading.

[0003] In the field of modern logistics and warehousing, efficient cargo handling and storage are the key to improving operational efficiency and reducing costs. Double-layer conveyor channels have emerged to bring new solutions to logistics operations. However, when the pallet switches channels, due to the movement of the lifting platform and the influence of the guide device, the pallet will shake or shift, causing the pallet to collide with the edge of the channel, thereby damaging the pallet and equipment and affecting the normal operation of the equipment. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an automatic pallet loading and unloading machine with a double-layer conveying channel switching structure, which can effectively solve the problem in the prior art that when the pallet is switching channels, due to the movement of the lifting platform and the influence of the guide device, the pallet will shake or shift, causing the pallet to collide with the edge of the channel, thereby damaging the pallet and the equipment, and affecting the normal operation of the equipment.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a pallet automatic loading and unloading machine with a double-layer conveying channel switching structure, comprising:

[0008] Conveyor rack;

[0009] A frame, wherein the frame is detachably mounted on one side of the feeding port of the conveying frame, the frame is slidably connected to a lifting platform through a telescopic unit arranged inside the frame, and the lifting platform is rotatably connected to a switching circular plate through a driving unit arranged inside the frame, and a slot is opened on the upper surface of the switching circular plate, and the slot is provided with four and distributed in a circular array around the central axis of the switching circular plate;

[0010] Wherein, a limiting assembly for limiting the tray is provided at the lower part of the switching circular plate, and the limiting assembly includes a support frame, the support frame is fixedly connected to the bottom end of the switching circular plate, the bottom end of the switching circular plate is fixedly connected to an inclined plate, and a guide hole is opened inside the inclined plate, the support frame is slidably connected to a moving frame through an elastic member arranged inside the support frame, and a mounting shaft that fits the inner wall of the guide hole is rotatably installed inside the moving frame, and a limiting plate that fits the inner wall of the slot hole is fixedly connected inside the mounting shaft;

[0011] Wherein, a switching component which can be used to adjust the position of the limit plate is provided at the lower part of the support frame.

[0012] Furthermore, a double-layer conveying channel for conveying the pallet is provided in the conveying frame, and a conveying roller is rotatably installed in the double-layer conveying channel, and a conveying shaft for moving the pallet is rotatably installed on the upper surface of the switching circular plate.

[0013] Furthermore, the switching assembly includes a circular ring, which is rotatably mounted on the lower part of the support frame through a ring groove arranged on its circumferential outer surface, the inner wall of the circular ring is fixedly connected to a ring gear, the bottom end of the switching circular plate is fixedly connected to a driving member, and the driving end of the driving member is fixedly connected to a driving gear meshing with the ring gear.

[0014] Furthermore, the switching assembly also includes a guide frame, which is fixedly connected to the inner wall of the circular ring. The guide frame is slidably connected to an abutting arc plate that fits the movable frame through an elastic member arranged inside the guide frame. The guide frame is magnetically connected to the upper surface of the abutting arc plate through a magnetic member arranged on the top of the guide frame.

[0015] Furthermore, a rotating shaft is rotatably installed inside the limit plate, and two rotating shafts are provided and are symmetrically distributed left and right with respect to the center of the limit plate. The end of the rotating shaft close to the switching circular plate is fixedly connected to a supporting plate, and the end of the rotating shaft away from the supporting plate is fixedly connected to a driven gear. When the supporting plate expands outward, the supporting plate and the limit plate form a T-shaped structure.

[0016] Furthermore, a slide rail is fixedly connected to the side of the limit plate away from the bearing plate, and a driven wedge is slidably connected inside the slide rail, and a rack meshing with the driven gear is fixedly connected to the top of the driven wedge.

[0017] Furthermore, the limit plate is slidably connected to an active wedge block that fits the inclined surface of the driven wedge block through a cavity opened inside it, the active wedge block is connected to the side wall of the cavity through a return spring arranged on the top thereof, and a counterweight block is fixedly connected inside the active wedge block.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0019] The present invention is provided with a limit position assembly. When the switching circular plate drives the pallet to rotate, the centrifugal force will drive the active wedge to move. Under the cooperation of the driven wedge, the driven gear and the rotating shaft, the two bearing plates will extend outward to form a "T-shaped structure" with the limit plate. The "cross bar" in the "T-shaped structure" can effectively disperse the vertical force. Compared with a single flat plate, its ability to resist bending deformation will be significantly enhanced, which can avoid excessive local stress and damage to the limit plate, which is beneficial to increasing the service life of the limit plate. When the pallet enters the conveying frame, the limit plate close to the conveying frame will be reset, and the other limit plates will still fit with the side of the pallet. The pallet will still move toward the conveying frame along its center line, which can avoid the pallet from entering the conveying frame from the lifting platform. The situation that the pallet cannot be accurately positioned in the ideal position and deflects will occur, resulting in collision between the pallet and the conveying frame, causing damage to the equipment or the pallet, and affecting the normal use of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the three-dimensional separation of the rack according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the three-dimensional separation of the limiting components in an embodiment of the present invention;

[0024] Figure 4 It is a three-dimensional structural diagram of a switching component according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the three-dimensional separation of the limiting plate in an embodiment of the present invention;

[0026] Figure 6 It is a cross-sectional schematic diagram of a limiting plate according to an embodiment of the present invention;

[0027] Figure 7 For the embodiment of the present invention Figure 6 A schematic diagram of the structure enlargement in the middle;

[0028] Figure 8 It is a structural schematic diagram of the three-dimensional state transformation of the carrying plate according to an embodiment of the present invention;

[0029] Fig. 9 For the embodiment of the present invention Figure 4Enlarged schematic diagram of the structure at point B in the middle.

[0030] The numbers in the figure represent respectively: 1, conveying frame; 2, frame; 21, lifting platform; 22, switching circular plate; 221, slot; 23, limiting assembly; 231, supporting frame; 232, inclined plate; 2321, guide hole; 233, moving frame; 234, mounting shaft; 235, limiting plate; 2351, rotating shaft; 2352, bearing plate; 2353, driven gear; 2354, slide rail; 2355, driven wedge; 2356, rack; 2357, active wedge; 2358, counterweight; 236, switching assembly; 2361, ring; 2362, gear ring; 2363, driving member; 2364, driving gear; 2365, guide frame; 2366, abutting arc plate; 2367, magnetic member. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention will be further described below in conjunction with the embodiments.

[0033] Example:

[0034] See also Figure 1-Figure 9 The present invention provides a technical solution: an automatic pallet loading and unloading machine with a double-layer conveying channel switching structure, comprising:

[0035] Conveyor rack 1;

[0036] The frame 2 is detachably mounted on one side of the feed port of the conveying frame 1. The frame 2 is slidably connected to the lifting platform 21 through a telescopic unit arranged inside the frame 2. The lifting platform 21 is rotatably connected to the switching circular plate 22 through a driving unit arranged inside the frame 2. The upper surface of the switching circular plate 22 is provided with slots 221, and the slots 221 are provided with four and are distributed in a circular array around the central axis of the switching circular plate 22.

[0037] The lower part of the switching circular plate 22 is provided with a limiting assembly 23 for limiting the tray, and the limiting assembly 23 includes a support frame 231, the support frame 231 is fixedly connected to the bottom end of the switching circular plate 22, and the bottom end of the switching circular plate 22 is fixedly connected to an inclined plate 232, and a guide hole 2321 is opened inside the inclined plate 232, and the support frame 231 is slidably connected to a moving frame 233 through an elastic member arranged inside the support frame 231, and a mounting shaft 234 that fits the inner wall of the guide hole 2321 is rotatably installed inside the moving frame 233, and a limiting plate 235 that fits the inner wall of the slot hole 221 is fixedly connected inside the mounting shaft 234;

[0038] A switching assembly 236 for adjusting the position of the limiting plate 235 is provided at the lower portion of the supporting frame 231 .

[0039] A double-layer conveying channel for conveying pallets is provided in the conveying frame 1, and conveying rollers are rotatably installed in the double-layer conveying channel. A conveying shaft for moving the pallet is rotatably installed on the upper surface of the switching circular plate 22.

[0040] The switching assembly 236 includes a circular ring 2361, which is rotatably mounted on the lower part of the support frame 231 through a ring groove arranged on its circumferential outer surface. A gear ring 2362 is fixedly connected to the inner wall of the circular ring 2361, and a driving member 2363 is fixedly connected to the bottom end of the switching circular plate 22, and the driving end of the driving member 2363 is fixedly connected to a driving gear 2364 meshing with the gear ring 2362.

[0041] The switching assembly 236 also includes a guide frame 2365, which is fixedly connected to the inner wall of the ring 2361. The guide frame 2365 is slidably connected to an abutting arc plate 2366 that fits the movable frame 233 through an elastic member arranged inside it. The guide frame 2365 is magnetically connected to the upper surface of the abutting arc plate 2366 through a magnetic member 2367 arranged on the top thereof.

[0042] A rotating shaft 2351 is rotatably installed inside the limiting plate 235, and the rotating shaft 2351 is provided with two and is symmetrically distributed left and right with respect to the center of the limiting plate 235. The end of the rotating shaft 2351 close to the switching circular plate 22 is fixedly connected to a supporting plate 2352, and the end of the rotating shaft 2351 away from the supporting plate 2352 is fixedly connected to a driven gear 2353. When the supporting plate 2352 expands outward, the supporting plate 2352 and the limiting plate 235 form a T-shaped structure.

[0043] A slide rail 2354 is fixedly connected to the side of the limiting plate 235 away from the bearing plate 2352 , and a driven wedge block 2355 is slidably connected inside the slide rail 2354 . A rack 2356 meshing with the driven gear 2353 is fixedly connected to the top of the driven wedge block 2355 .

[0044] The limit plate 235 is slidably connected to an active wedge block 2357 that fits the inclined surface of the driven wedge block 2355 through a cavity opened therein. The active wedge block 2357 is connected to the side wall of the cavity through a return spring arranged on the top thereof, and a counterweight block 2358 is fixedly connected to the inside of the active wedge block 2357.

[0045] Working principle of the automatic pallet loader and unloader with double-layer conveyor channel switching structure:

[0046] Pallet loading and limiting process:

[0047] First, the driving unit rotates the switching circular plate 22 to the pallet loading position (the switching circular plate 22 is driven to rotate by the driving unit so that the feeding direction of the pallet is consistent with that of the conveying shaft on the switching circular plate 22). At this time, the external pallet conveying equipment will move the pallet to the lifting platform 21. Then, the conveying shaft on the switching circular plate 22 will fine-tune the pallet on the lifting platform 21 (the pallet is fine-tuned by the conveying shaft to ensure that the pallet is in the middle of the switching circular plate 22, which is beneficial to the limiting of the pallet by the limiting plate 235). At this time, the driving member 2363 in the switching assembly 236 will drive the active gear 2364 to rotate. Since the active gear 2364 is meshed with the ring gear 2362 in the ring 2361, the ring 2361 will rotate. During the rotation of the ring 2361, the abutting arc plate 2366 on the inner wall of the ring 2361 will abut against the arc surface of the moving frame 233.

[0048] When the abutting arc plate 2366 just contacts the arc surface of the movable frame 233, at this time, the movable frame 233 has not moved, the limit plate 235 is at the edge of the slot 221, and the top of the limit plate 235 is flush with the plane of the switching circular plate 22 (the initial position of the limit plate 235 is at the edge of the slot 221, and the top of the limit plate 235 is flush with the plane of the switching circular plate 22, which can ensure that the tray will not interfere when it is at the top of the switching circular plate 22, causing the conveying shaft on the switching circular plate 22 to be unable to move the tray smoothly). As the abutting arc plate 2366 protrudes outward, as the circular ring 2361 drives the abutting arc plate 2366 to rotate, the abutting arc plate 2366 will gradually push the moving frame 233 to move. At the same time, the elastic members in the moving frame 233 and the supporting frame 231 will be compressed. When the moving frame 233 moves, the mounting shaft 234 at the lower part of the limiting plate 235 will move along the guide hole 2321 on the inclined plate 232. Since the inclined plate 232 is inclined at a certain angle to the plane position, the limiting plate 235 can move upward while gradually approaching the side wall of the tray until the limiting plate 235 is completely fitted with the side wall of the tray. Then, the driving member 2363 cooperates with the active The gear 2364 and the gear ring 2362 can drive the ring 2361 and the abutting arc plate 2366 to continue to rotate in the same direction at a small angle. At this time, the abutting arc plate 2366 cooperates with the movable frame 233 to push the limit plate 235 to move a certain distance. At this time, the elastic part on the limit plate 235 will be compressed, making the contact between the limit plate 235 and the tray closer (the plane position of the limit plate 235 is slightly higher than the plane position of the supporting plate 2352. When the elastic part on the limit plate 235 is squeezed, the supporting plate 2352 just fits against the side wall of the tray, ensuring that the subsequent rotation of the supporting plate 2352 is not affected), thereby completing the limitation of the tray.

[0049] It is worth mentioning that the external conveying equipment can load the pallet from different positions of the rack 2 (one side of the rack 2 is connected to the conveying rack 1, and the external conveying equipment can deliver the pallet to the lifting platform 21 from other positions of the rack 2, and can accommodate pallets of different specifications or different flow directions at the same time). The four limit plates 235 extend synchronously from the slots 221 and gradually approach the side walls of the pallet until the limit plates 235 fit the side walls of the pallet, which can effectively limit the horizontal movement of the pallet. In the subsequent movement process, whether it is the vibration of the equipment or the interference caused by other external factors, the pallet can remain in a fixed position and will not easily shift. When the pallet carries goods with uneven center of gravity, the clamping of the limit plates 235 on all sides of the pallet can ensure that the pallet is always in the middle of the lifting platform 21. The support force provided by the four limit plates 235 from four directions can balance the force on the pallet, keep the pallet horizontal, and prevent the pallet from rotating and tilting.

[0050] Switching of conveying channels:

[0051] After the tray is limited, the driving unit at the bottom of the switching circular plate 22 will drive the switching circular plate 22 to rotate, so that the conveying direction of the conveying shaft in the switching circular plate 22 is consistent with the conveying frame 1 (a driving unit is provided in the switching circular plate 22 to drive the conveying shaft to rotate). When the switching circular plate 22 rotates rapidly under the cooperation of the driving unit, the active wedge block 2357 in the limit plate 235 will be affected by the centrifugal force under the cooperation of the counterweight block 2358 inside it, and will slide outward along the cavity in the limit plate 235 (the return spring on the active wedge block 2357 is stretched). At the same time, the driven wedge block 2355 that fits the inclined surface of the active wedge block 2357 will move along the slide rail 2354 to the two sides of the limit plate 235. During the movement of the driven wedge block 2355, the driven wedge block 2357 will move along the slide rail 2354 to the two sides of the limit plate 235. The rack 2356 on the top of block 2355 will mesh with the driven gear 2353, and then the rotating shaft 2351 will drive the supporting plate 2352 to expand outward until the supporting plate 2352 rotates 90 degrees (a groove is provided on the surface of the rotating shaft 2351, which cooperates with the limiting protrusion inside the limiting plate 235 to achieve a maximum rotation angle of 90 degrees for the supporting plate 2352), forming a "T-shaped structure" with the limiting plate 235, which can reduce the pressure on the limiting plate 235 generated by the tray's own inertia during rotation. After the rotation stops, the centrifugal force disappears. At this time, the reset spring will return to its initial state, generating an inward force on the active wedge block 2357, and then the active wedge block 2357 will move into the cavity until it returns to its initial position. While the active wedge block 2357 moves, the driven wedge block 2355 will reset (a guide block is provided on the inclined surface of the active wedge block 2357, and a guide groove is provided on the inclined surface of the driven wedge block 2355 that fits the guide block, so that the active wedge block 2357 and the driven wedge block 2355 can move synchronously). At this time, the driven gear 2353 will rotate in the opposite direction with the cooperation of the rack 2356, and cooperate with the rotating shaft 2351 to realize the reset of the bearing plate 2352.

[0052] It is worth noting that when the limiting plate 235 is subjected to a force perpendicular to the plane, after the two supporting plates 2352 are stretched to form a "T-shaped structure", the "cross bar" in the "T-shaped structure" (i.e., the part after the supporting plate 2352 is stretched) can effectively disperse the vertical force. According to the principles of material mechanics, under the same external force, the area of ​​force action increases and the stress per unit area decreases. When subjected to concentrated force, the "T-shaped structure" formed by the two supporting plates 2352 can better disperse the concentrated force. Compared with a single flat plate, its ability to resist bending deformation will be significantly enhanced, thereby avoiding excessive local stress and damage to the limiting plate 235.

[0053] After the rotation is completed, the telescopic unit in the frame 2 will move the lifting platform 21 to one of the double-layer conveying channels according to the conveying requirements of the pallet. At this time, the driving member 2363 drives the active gear 2364 to slightly rotate in the opposite direction by a small angle, so that the elastic member on the limit plate 235 loses the extrusion and returns to the initial position. The abutting arc plate 2366 close to the double-layer conveying channel will produce a mutually repulsive force with the abutting arc plate 2366 under the cooperation of the magnetic member 2367 (the magnetic member 2367 adopts an electromagnet, and its polarity can be changed by changing the direction of the current), so that the abutting arc plate 2366 moves downward along the guide frame 2365 and compresses the elastic member at the bottom of the abutting arc plate 2366, so that the abutting arc plate 2366 and the arc surface of the moving frame 233 are misaligned. After the moving frame 233 loses the limit, The elastic member will reset the movable frame 233. At this time, the limit plate 235 close to the side of the conveying frame 1 will move to the initial position along the guide hole 2321. Then, the conveying shaft on the switching circular plate 22 will move the tray into the conveying frame 1. With the conveying roller in the conveying frame 1, the tray can be moved to the next position. Then, the driving member 2363 drives the active gear 2364 to rotate the ring 2361 in the opposite direction to realize the reset of the limit plate 235. This reciprocating process can realize continuous conveying of the tray.

[0054] It is worth mentioning that after the limit plate 235 close to the conveyor rack 1 is reset, the pallet can be moved into the conveyor rack 1 with the cooperation of the conveying shaft on the switching circular plate 22. Since the other three limit plates 235 are still in contact with the side of the pallet, the pallet will move along the middle of the lifting platform 21 into the conveyor rack 1 at this time. This can prevent the pallet from being accurately positioned in the ideal position when entering the conveyor rack 1 from the lifting platform 21, causing the pallet to offset, resulting in a collision between the pallet and the conveyor rack 1, causing damage to the equipment or the pallet, and affecting the normal use of the equipment.

[0055] The present invention uses the limiting component 23 has the following advantages:

[0056] Advantage 1: The position of the limit plate 235 can be adjusted to accommodate pallets of different specifications. In addition, the switching circular plate 22 can rotate with the cooperation of the driving unit, so that the lifting platform 21 can accommodate pallets of different directions. The telescopic unit can drive the lifting platform 21 to automatically switch the conveying channel according to the conveying requirements. The degree of automation is high, which can realize the classified conveying of pallets and improve the processing capacity and flexibility of the equipment.

[0057] Advantage two: the limit plates 235 in the limit assembly 23 limit the pallet from all four sides at the same time. The supporting force provided by the four limit plates 235 from four directions can balance the force on the pallet, keep the pallet in a horizontal state, and make the pallet in the center position of the lifting platform 21. The position of the pallet can be corrected to prevent the pallet from offsetting on the lifting platform 21 and affecting the subsequent transportation requirements of the pallet.

[0058] Advantage three: initially, the limit plate 235 is at the edge of the slot 221, and the top of the limit plate 235 remains flush with the plane of the switching circular plate 22, which can prevent the pallet from being interfered with when entering the lifting platform 21 and affecting the movement of the pallet. As the moving frame 233 moves, the limit plate 235 cooperates with the installation shaft 234 to gradually approach the side wall of the pallet along the guide hole 2321 until the pallet is limited.

[0059] Advantage four, when the switching circular plate 22 drives the tray to rotate, the centrifugal force will drive the active wedge block 2357 to move. With the cooperation of the driven wedge block 2355, the driven gear 2353 and the rotating shaft 2351, the two bearing plates 2352 will extend outward to form a "T-shaped structure" with the limit plate 235. The "cross bar" in the "T-shaped structure" can effectively disperse the vertical force. Compared with a single flat plate, its ability to resist bending deformation will be significantly enhanced, which can avoid excessive local stress and damage to the limit plate 235, which is beneficial to increase the service life of the limit plate 235.

[0060] Advantage five: when the pallet enters the conveyor rack 1, the limit plate 235 close to the conveyor rack 1 will be reset, and the other limit plates 235 will still fit with the side of the pallet. The pallet will still move toward the conveyor rack 1 along its center line. This can prevent the pallet from entering the conveyor rack 1 from the lifting platform 21. The pallet cannot be accurately positioned in the ideal position and is offset, causing the pallet to collide with the conveyor rack 1, causing damage to the equipment or the pallet, and affecting the normal use of the equipment.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic pallet loading and unloading machine with a double-layer conveying channel switching structure, characterized in that: include: Conveyor rack (1); A frame (2), the frame (2) being detachably mounted on one side of the feed port of the conveying frame (1), the frame (2) being slidably connected to a lifting platform (21) via a telescopic unit arranged inside the frame (2), the lifting platform (21) being rotatably connected to a switching circular plate (22) via a driving unit arranged inside the frame (2), the upper surface of the switching circular plate (22) being provided with slots (221), and the slots (221) being provided with four and distributed in a circular array about the central axis of the switching circular plate (22); Wherein, a limiting assembly (23) for limiting the tray is provided at the lower part of the switching circular plate (22), and the limiting assembly (23) comprises a support frame (231), the support frame (231) is fixedly connected to the bottom end of the switching circular plate (22), the bottom end of the switching circular plate (22) is fixedly connected to an inclined plate (232), and a guide hole (2321) is provided inside the inclined plate (232), the support frame (231) is slidably connected to a moving frame (233) through an elastic member arranged inside the support frame (231), and a mounting shaft (234) which is in contact with the inner wall of the guide hole (2321) is rotatably installed inside the moving frame (233), and a limiting plate (235) which is in contact with the inner wall of the slot hole (221) is fixedly connected inside the mounting shaft (234); Wherein, a switching component (236) which can be used to adjust the position of the limiting plate (235) is provided at the lower part of the support frame (231).

2. The automatic pallet loading and unloading machine with a double-layer conveying channel switching structure according to claim 1 is characterized in that: The conveying frame (1) is provided with a double-layer conveying channel for conveying pallets, and a conveying roller is rotatably mounted in the double-layer conveying channel. A conveying shaft for moving the pallet is rotatably mounted on the upper surface of the switching circular plate (22).

3. The automatic pallet loading and unloading machine with a double-layer conveying channel switching structure according to claim 1 is characterized in that: The switching assembly (236) comprises a circular ring (2361), wherein the circular ring (2361) is rotatably mounted on the lower part of the support frame (231) via a circular groove arranged on the outer surface of the circular ring, a gear ring (2362) is fixedly connected to the inner wall of the circular ring (2361), a driving member (2363) is fixedly connected to the bottom end of the switching circular plate (22), and a driving end of the driving member (2363) is fixedly connected to a driving gear (2364) meshing with the gear ring (2362).

4. The automatic pallet loading and unloading machine with a double-layer conveying channel switching structure according to claim 1 is characterized in that: The switching assembly (236) further comprises a guide frame (2365), wherein the guide frame (2365) is fixedly connected to the inner wall of the circular ring (2361), wherein the guide frame (2365) is slidably connected to an abutting arc plate (2366) that fits the movable frame (233) via an elastic member arranged inside the guide frame (2365), and wherein the guide frame (2365) is magnetically connected to the upper surface of the abutting arc plate (2366) via a magnetic member (2367) arranged at the top thereof.

5. The automatic pallet loading and unloading machine with a double-layer conveying channel switching structure according to claim 1 is characterized in that: A rotating shaft (2351) is rotatably mounted inside the limiting plate (235), and two rotating shafts (2351) are provided and are symmetrically distributed about the center of the limiting plate (235). One end of the rotating shaft (2351) close to the switching circular plate (22) is fixedly connected to a bearing plate (2352), and one end of the rotating shaft (2351) away from the bearing plate (2352) is fixedly connected to a driven gear (2353). When the bearing plate (2352) expands outward, the bearing plate (2352) and the limiting plate (235) form a T-shaped structure.

6. The automatic pallet loading and unloading machine with a double-layer conveying channel switching structure according to claim 1 is characterized in that: The limiting plate (235) is fixedly connected to a slide rail (2354) on one side away from the supporting plate (2352), and a driven wedge block (2355) is slidably connected inside the slide rail (2354), and a rack (2356) meshing with the driven gear (2353) is fixedly connected to the top of the driven wedge block (2355).

7. The automatic pallet loading and unloading machine with a double-layer conveying channel switching structure according to claim 1 is characterized in that: The limit plate (235) is slidably connected to an active wedge (2357) which fits the inclined surface of the driven wedge (2355) through a cavity provided inside the limit plate (235); the active wedge (2357) is connected to the side wall of the cavity through a return spring arranged on the top thereof, and a counterweight (2358) is fixedly connected inside the active wedge (2357).

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