A pallet coding device

By using limit adjustment components and a cylinder-driven baffle-type fork structure in the pallet sorting device, the problems of high failure rate and low efficiency caused by electromagnet hysteresis are solved, and the efficient and stable operation of the pallet sorting device is achieved.

CN224477624UActive Publication Date: 2026-07-10SHANGHAI TOBACCO GROUP CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANGHAI TOBACCO GROUP CO LTD
Filing Date
2025-07-29
Publication Date
2026-07-10

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Abstract

This utility model provides a pallet sorting device, belonging to the field of pallet sorting technology. The pallet sorting device includes a first support frame, multiple forks, two second support frames, two first lifting components, a first driving component, and two limiting adjustment components. In this utility model, the two limiting adjustment components respectively limit the corresponding forks, keeping the forks in a first state. When at least one pallet is placed at a first preset position on the first support frame or a second preset position above the first support frame, the tops of both limiting adjustment components are adjusted to a first preset height. The two first lifting components respectively drive the forks to rise to a third preset position higher than the first preset height and matching the corresponding pallet. The forks then rotate to a second state and engage with the pallet, preventing hysteresis, improving operating efficiency, reducing failure rate, and enhancing equipment operational stability.
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Description

Technical Field

[0001] This utility model relates to the field of pallet sorting technology, and specifically to a pallet sorting device. Background Technology

[0002] In the existing pallet sorting system, the lifting mechanism rises from a low position, energizing an electromagnet to hold the pallet upright and prevent it from tipping over. When it reaches a certain height, the electromagnet is de-energized, losing its magnetic force, and the pallet, under its own weight, flips downwards into the gap at the bottom of the second pallet in the stack. This allows it to support all pallets above the second in the stack, lifting them together, leaving the bottom pallet on the conveyor mechanism for distribution. However, in existing pallet sorting systems, the electromagnets develop hysteresis after prolonged use. Even with a time delay to compensate for the release of the pallet, the failure rate caused by hysteresis cannot be completely eliminated. Furthermore, the delayed release reduces the operating efficiency of the pallet sorting system, affecting overall warehousing efficiency.

[0003] Chinese patent CN2908436Y, published on 2007-06-06, discloses a pallet sorting mechanism. This mechanism includes frames on both sides of a pallet conveying mechanism, with symmetrical lifting mechanisms on each frame. Each lifting mechanism has a rotatable hook for grabbing the pallet, and a hook fixing mechanism at the top. In this patent, the lifting mechanism is controlled to rise from a low position by energizing an electromagnet to hold the pallet upright and prevent it from flipping. When it reaches a certain height, the electromagnet is de-energized, losing its magnetic force, and the pallet flips downwards under its own weight, rotating into the gap at the bottom of the second pallet below the pallet stack. However, after prolonged use, the electromagnet develops hysteresis. Even with a time delay to compensate for the electromagnet's release of the pallet, the failure rate caused by hysteresis cannot be completely resolved. Furthermore, the delayed release reduces the operating efficiency of the pallet sorting device, affecting overall warehousing efficiency. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing a pallet sorting device.

[0005] This utility model proposes a pallet sorting device, including a first support frame, multiple forks, two second support frames symmetrically connected to the left and right ends of the first support frame, two first lifting members respectively connected to the two second support frames, a first driving member for driving the two first lifting members respectively, and two symmetrically arranged limiting adjustment members whose top heights are adjustable. The multiple forks are rotatably connected to the two first lifting members respectively, and at least one fork is connected to each first lifting member. The two limiting adjustment members are respectively arranged corresponding to the forks connected to the two first lifting members and are arranged between the two first lifting members. The limiting adjustment members are used to limit the corresponding forks, so that the forks are kept in a first state. When at least one pallet is placed at a first preset position on the first support frame or a second preset position above the first support frame, the tops of the two limiting adjustment members are adjusted to a first preset height, and the two first lifting members respectively drive the forks to rise to a third preset position higher than the first preset height and matching the corresponding pallet. The forks rotate to a second state and are inserted into the pallet.

[0006] Furthermore, it also includes a conveyor connected to the top of the first support frame for conveying the pallet; the conveyor can convey the pallet to a second preset position above the first support frame.

[0007] Furthermore, the limiting adjustment component includes a baffle, a cylinder, and a first support structure. The bottom end of the cylinder is connected to the first support structure. The baffle is used to limit the corresponding fork pawl, so that the fork pawl remains in a first state. The output end of the cylinder is connected to the baffle and is used to drive the baffle to move up and down, so that the top of the baffle moves to a first preset height.

[0008] Furthermore, the first support structure includes a first bracket and two symmetrically arranged second brackets. The bottom of the cylinder is connected to the first bracket, and the two ends of the first bracket are detachably connected to the middle of the two adjacent sides of the two second brackets.

[0009] Furthermore, the first support structure also includes two first limiting blocks, which are respectively connected to the upper parts of the two adjacent sides of the two second brackets. The two adjacent sides of the two first limiting blocks are respectively provided with first guide grooves, and the two ends of the baffle are respectively inserted into the two first guide grooves.

[0010] Furthermore, the first support structure also includes two bases, a plurality of first connecting rods, and two first support plates corresponding to the two bases. The bottoms of the two second brackets are respectively connected to the two first support plates. The first connecting rods are respectively connected to a base and a first support plate corresponding to the base. Each base is provided with at least one first connecting rod.

[0011] Furthermore, the first support structure also includes a plurality of first fastening nuts. At least one first mounting through hole is provided through the first support plate. The bottom of the first connecting rod is connected to the base, and the top of the first connecting rod passes through the first mounting through hole. One first fastening nut is screwed onto the portion of the first connecting rod located above the first support plate, and another first fastening nut is screwed onto the portion of the first connecting rod located below the first support plate. The two first fastening nuts respectively abut against the first support plate.

[0012] Furthermore, the first mounting through hole is a strip-shaped hole, and the bottom of the first connecting rod is connected to the base, while the top can pass through different parts of the first mounting through hole.

[0013] Furthermore, the first driving component includes a first drive shaft rotatably connected to the first support frame and a first drive motor for driving the first drive shaft. The first lifting component includes a second limiting block, a first connecting block, a second rotating shaft, a first connecting structure, a first sprocket disposed at one end of the first drive shaft, a first rotating shaft rotatably connected to a second support frame, a second sprocket connected to the first rotating shaft, and a first chain respectively sleeved on the first sprocket and the second sprocket. The first connecting block is respectively connected to the first chain and the second limiting block. The first connecting structure is connected to the second limiting block. The second rotating shaft is rotatably connected to the first connecting structure. The fork is eccentrically connected to the second rotating shaft. When the fork rotates to the second state, one end of the fork can be inserted into a tray, and the top of the other end abuts against the bottom of the second limiting block.

[0014] Furthermore, the first lifting component also includes a first guide rail connected to the second support frame, and a first sliding structure with one end connected to the second limiting block and the other end slidably connected to the first guide rail.

[0015] The pallet sorting device of this utility model has the following beneficial effects:

[0016] Two limiting adjustment components limit the corresponding fork claws respectively, so that the fork claws remain in the first state. When at least one pallet is placed in the first preset position on the first support frame or in the second preset position above the first support frame, the tops of the two limiting adjustment components are adjusted to the first preset height. The two first lifting components drive the fork claws to rise to the third preset position, which is higher than the first preset height and matches the corresponding pallet. The fork claws rotate to the second state and are inserted into the pallet. No hysteresis phenomenon occurs, which improves operating efficiency, reduces failure rate, and improves the operating stability of the equipment. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0018] Figure 1 This is a partial structural diagram of a pallet sorting device according to an embodiment of the present invention, omitting the conveying component;

[0019] Figure 2 This is a partial front view of a pallet sorting device according to an embodiment of the present invention, omitting the conveying component;

[0020] Figure 3 This is a partial side view of a pallet sorting device according to an embodiment of the present invention, omitting the conveying component;

[0021] Figure 4 This is a partial structural diagram of a pallet sorting device according to an embodiment of the present utility model, omitting the conveying component, the first support frame, and the second support frame;

[0022] Figure 5 This is a schematic diagram of the structure of a limit adjustment component in a pallet sorting device according to an embodiment of the present invention;

[0023] Figure 6 This is a side view of a limit adjustment component in a pallet sorting device according to an embodiment of the present utility model;

[0024] Figure 7 This is a partial structural diagram of a pallet sorting device according to an embodiment of the present invention, in which the first connecting structure is connected to the second limiting block and the second rotating shaft respectively.

[0025] In the diagram: 1-First support frame, 2-Second support frame, 3-First lifting component, 31-First sprocket, 32-Second sprocket, 33-First rotating shaft, 34-First chain, 35-Second limiting block, 36-Second rotating shaft, 371-First bearing, 372-First mounting block, 38-First guide rail, 39-First sliding structure, 4-Fork claw, 5-Limit adjustment component, 51-Baffle, 52-Cylinder, 53-First bracket, 54-Second bracket, 55-Base, 56-First support plate, 561-First mounting through hole, 57-First connecting rod, 58-First limiting block, 59-First fastening nut, 6-First driving component, 61-First drive motor, 62-First transmission shaft. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model 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 this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0027] Please see Figures 1 to 7 This utility model discloses a pallet sorting device, comprising a first support frame 1, multiple forks 4, two second support frames 2 symmetrically connected to the left and right ends of the first support frame 1, two first lifting members 3 respectively connected to the two second support frames 2, a first driving member 6 for driving the two first lifting members 3 respectively, and two symmetrically arranged limit adjusting members 5 whose top heights are adjustable. The multiple forks 4 are rotatably connected to the two first lifting members 3, and at least one fork 4 is connected to each first lifting member 3. The two limit adjusting members 5 are respectively connected to the forks of the two first lifting members 3. 4. Correspondingly, two limiting adjustment members 5 are set between two first lifting members 3; the limiting adjustment members 5 are used to limit the corresponding fork pawl 4 so that the fork pawl 4 remains in the first state; when at least one pallet is placed in the first preset position on the first support frame 1 or in the second preset position above the first support frame 1, the tops of the two limiting adjustment members 5 are adjusted to the first preset height, and the two first lifting members 3 respectively drive the fork pawl 4 to rise to the third preset position that is higher than the first preset height and matches the corresponding pallet, and the fork pawl 4 rotates to the second state and is inserted into the pallet.

[0028] Here, when the first lifting member 3 does not drive the fork 4 connected to it to rise above the top of the limiting adjustment member 5, the limiting adjustment member 5 can limit the fork 4 corresponding to it, so that the fork 4 remains in the first state; when at least one pallet is placed at the first preset position on the first support frame 1 or at the second preset position above the first support frame 1, the height of the top of the two limiting adjustment members 5 can be lower than the height of the pallet to be processed, and the height of the fork 4 is also lower than the height of the pallet to be processed. When the top of the two limiting adjustment members 5 is adjusted to the first preset height, the two first lifting members 3 respectively drive the fork 4 connected to them to rise to the third preset position higher than the first preset height and matching the corresponding pallet. That is, when the two first lifting members 3 respectively drive the fork 4 connected to them to rise to the third preset position higher than the first preset height and matching the pallet to be processed, the fork 4 is not limited by the limiting adjustment member 5. At this time, the fork 4 can rotate to the second state, and the fork 4 is inserted into the pallet to be processed. The multiple fork 4 connected to the two first lifting members 3 are respectively inserted into the two sides of the pallet. At least one fork 4 is connected to a first lifting member 3, so that the fork 4 connected to two first lifting members 3 respectively can be inserted into the two sides of the pallet, thereby lifting the pallet. The pallet may be provided with fork holes, and the fork 4 can be inserted into the fork holes of the pallet, thereby realizing insertion into the pallet. This application can ensure the accuracy and synchronization of the fork 4 on both sides, and the overall device operates stably with a low failure rate.

[0029] Specifically, the first state of the fork pawl 4 is when it is set vertically upwards, and the second state of the fork pawl 4 is when it is set horizontally. The tops of both limiting adjustment members 5 are adjusted to a first preset height. The first lifting member 3 drives the fork pawl 4 connected to it to move upwards. When the fork pawl 4 rises to a third preset position higher than the first preset height and matching the corresponding tray, the fork pawl 4 will flip downwards due to its own gravity during the upward movement, rotating to the second state and thus inserting into the tray. Multiple fork pawls 4 on the two first lifting members 3 flip downwards respectively, thus inserting into the two sides of the tray. The first lifting member 3 drives the fork pawl 4 connected to it to move downwards. When the fork pawl 4 descends to contact the limiting adjustment member 5, the limiting adjustment member 5 can limit the fork pawl 4, causing it to flip again and rotate to the first state. The first lifting member 3 on the left side drives the fork 4 connected to it to move upward. When the fork 4 rises to a third preset position that is higher than the first preset height and matches the corresponding tray, the fork 4 rotates clockwise to the second state. The first lifting member 3 on the right side drives the fork 4 connected to it to move upward. When the fork 4 rises to a third preset position that is higher than the first preset height and matches the corresponding tray, the fork 4 rotates counterclockwise to the second state.

[0030] As one embodiment of the pallet sorting device, it may also include a conveyor connected to the top of the first support frame 1 for conveying pallets; the conveyor can convey the pallets to a second preset position above the first support frame 1.

[0031] Specifically, the conveyor can be a chain conveyor or a roller conveyor. The axis of the conveyor can be parallel to the horizontal axis of the first support frame 1, and the two second support frames 2 can be symmetrically arranged about the vertical axis of the first support frame 1. Multiple forks 4 can be symmetrically connected to a first lifting member 3. The tops of the two limiting adjustment members 5 are adjusted to a first preset height. The two first lifting members 3 respectively drive the multiple forks 4 to rise to a third preset position higher than the first preset height and matching the corresponding pallet. The multiple forks 4 rotate to a second state and insert into the pallet, so that the multiple forks 4 can support one side of the pallet. The conveyor can be the pallet conveying mechanism disclosed in Chinese Patent CN2908436Y, "A Pallet Separating Mechanism". The conveyor can also be the conveying mechanism disclosed in Chinese Patent CN114803535A, "A Pallet Splitting Machine".

[0032] The limiting adjustment component 5 may include a baffle 51, a cylinder 52, and a first support structure. The bottom end of the cylinder 52 is connected to the first support structure. The baffle 51 is used to limit the corresponding fork 4 so that the fork 4 remains in a first state. The output end of the cylinder 52 is connected to the baffle 51 to drive the baffle 51 to move up and down, so that the top of the baffle 51 moves to a first preset height.

[0033] Specifically, cylinder 52 is vertically positioned, with its output end pointing vertically upwards. The output end of cylinder 52 is connected to the middle of the bottom end of baffle 51. When cylinder 52 extends, it pushes baffle 51 upwards, thereby adjusting the height of the top of the limit adjustment member 5. When cylinder 52 shortens, it pulls baffle 51 downwards, thereby adjusting the height of the top of the limit adjustment member 5.

[0034] Specifically, the limit adjustment component 5 of this application can be a novel stop-type fork claw 4 structure. This application satisfies the function of splitting pallet groups into individual pallets, improving warehousing efficiency and enhancing the overall operational stability of the device. Simultaneously, this application removes the existing electromagnets on both sides and adds a baffle 51 type fork claw 4 structure with cylinders 52 as the power source and baffles 51 as the actuator on both sides. By splitting the entire pallet group into individual wooden pallets, the new mechanism improves operational efficiency, significantly reduces the failure rate, and enhances equipment stability. Replacing the existing electromagnet-type fork claw 4 mechanism with the baffle 51 type fork claw 4 mechanism eliminates hysteresis. This application satisfies the pallet splitting function of the pallet sorting machine, ensuring precise fork retraction and placement, and stable device operation.

[0035] The first support structure may include a first bracket 53 and two symmetrically arranged second brackets 54. The bottom of the cylinder 52 is connected to the first bracket 53, and the two ends of the first bracket 53 are detachably connected to the middle of the two adjacent sides of the two second brackets 54.

[0036] The first support structure may also include two first limiting blocks 58, which are respectively connected to the upper parts of the two adjacent sides of the two second brackets 54. The two adjacent sides of the two first limiting blocks 58 are respectively provided with first guide grooves, and the two ends of the baffle 51 are respectively inserted into the two first guide grooves.

[0037] Specifically, the limit adjustment component 5 may also include a PLC controller, and a high-position magnetic induction switch and a low-position magnetic induction switch respectively disposed on the first limit block 58. The high-position magnetic induction switch and the low-position magnetic induction switch ensure that the fork 4 proceeds to the next step only after both sides of the stop block are simultaneously in the low or high position, thus ensuring the synchronization of the fork 4. The first limit block 58 may be a nylon limit block.

[0038] The first support structure may also include two bases 55, multiple first connecting rods 57, and two first support plates 56 corresponding to the two bases 55. The bottoms of the two second brackets 54 are respectively connected to the two first support plates 56. The first connecting rods 57 are respectively connected to a base 55 and the first support plate 56 corresponding to the base 55. At least one first connecting rod 57 is corresponding to one base 55.

[0039] The first support structure may also include a plurality of first fastening nuts 59. At least one first mounting through hole 561 is provided through the first support plate 56. The bottom of the first connecting rod 57 is connected to the base 55, and the top of the first connecting rod 57 passes through the first mounting through hole 561. One first fastening nut 59 is screwed onto the part of the first connecting rod 57 located above the first support plate 56, and another first fastening nut 59 is screwed onto the part of the first connecting rod 57 located below the first support plate 56. The two first fastening nuts 59 respectively abut against the first support plate 56.

[0040] Specifically, baffle 51 can be a reverse concave baffle 51. After the limit adjustment component 5 is assembled, the jamming rate of baffle 51 is adjusted. When the cylinder 52 is not ventilated, it moves freely up and down without jamming. Then, through the modified program, the PLC controller receives the signal from the low-position magnetic induction switch or the high-position magnetic induction switch, detects whether the cylinders 52 of the two limit adjustment components 5 are synchronized, and connects to the air circuit. The program executes the set action flow to realize the action of the new mechanism. After detecting whether the cylinders 52 of the new device on both sides are synchronized at the high or low position by the high-position magnetic induction switch or the low-position magnetic induction switch, the next action is executed after synchronization is detected to realize the retraction and release of the two forks 4.

[0041] Specifically, by moving the baffle 51 up and down to avoid the influence of hysteresis, the baffle 51 can accurately retract and extend the fork 4.

[0042] The first mounting through hole 561 can be a strip-shaped hole, and the bottom of the first connecting rod 57 is connected to the base 55, while the top can pass through different parts inside the first mounting through hole 561.

[0043] Specifically, the bottom of the first connecting rod 57 is connected to the base 55, and its top can pass through different parts within the first mounting through hole 561. Then, the first connecting rod 57 and the first support plate 56 are fixedly connected by two first fastening nuts 59. Different parts of the first connecting rod 57 pass through the first mounting through hole 561, and then the first connecting rod 57 and the first support plate 56 are fixedly connected by two first fastening nuts 59.

[0044] The first driving component 6 may include a first drive shaft 62 rotatably connected to the first support frame 1 and a first drive motor 61 for driving the first drive shaft 62. The first lifting component 3 includes a second limiting block 35, a first connecting block, a second rotating shaft 36, a first connecting structure, a first sprocket 31 disposed at one end of the first drive shaft 62, a first rotating shaft 33 rotatably connected to a second support frame 2, a second sprocket 32 ​​connected to the first rotating shaft 33, and a first chain 34 respectively sleeved on the first sprocket 31 and the second sprocket 32. The first connecting block is respectively connected to the first chain 34 and the second limiting block 35. The first connecting structure is connected to the second limiting block 35. The second rotating shaft 36 is rotatably connected to the first connecting structure. The fork 4 is eccentrically connected to the second rotating shaft 36. When the fork 4 rotates to the second state, one end of the fork 4 can be inserted into a tray, and the top of the other end abuts against the bottom of the second limiting block 35.

[0045] Specifically, the first connecting structure may include a first bearing 371 and a first mounting block 372 connected to the second limiting block 35. The outer ring of the first bearing 371 is fixedly connected to the first mounting block 372, and the second rotating shaft 36 is sleeved on the inner ring of the first bearing 371. The second limiting block 35 is horizontally positioned, and the second rotating shaft 36 may be parallel to the second limiting block 35. The fork pawl 4 is eccentrically connected to the second rotating shaft 36, and the top of the fork pawl 4 is connected to the second rotating shaft 36. The distance between the end of the fork pawl 4 near the pallet and the connection point of the fork pawl 4 and the second rotating shaft 36 is greater than the distance between the end of the fork pawl 4 away from the pallet and the connection point of the fork pawl 4 and the second rotating shaft 36.

[0046] The first lifting component 3 may also include a first guide rail 38 connected to the second support frame 2, and a first sliding structure 39 with one end connected to the second limiting block 35 and the other end slidably connected to the first guide rail 38.

[0047] Specifically, the first sliding structure 39 can be a slider. Through the cooperation of the first sliding structure 39 and the first guide rail 38, the second limiting block 35 is ensured to move up and down along a predetermined direction.

[0048] Specifically, this application is designed for the logistics loading and unloading field. Its unique design ensures that the two side forks 4 maintain extremely high precision during operation, achieving perfect synchronization of movements, thereby greatly improving the efficiency and accuracy of logistics operations. This structure, through the combination of precise mechanical transmission and an advanced control system, ensures the stability of the mechanism's operation, maintaining consistently excellent performance even under long-term, high-intensity working environments.

[0049] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.

[0050] It should be noted that in the description of this application, the terms "upper end," "lower end," and "bottom end," indicating orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device 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 on this application. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise limited, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pallet sorting device, characterized in that: The system includes a first support frame (1), multiple forks (4), two second support frames (2) symmetrically connected to the left and right ends of the first support frame (1), two first lifting members (3) respectively connected to the two second support frames (2), a first driving member (6) for driving the two first lifting members (3) respectively, and two limit adjustment members (5) symmetrically arranged and whose top height can be adjusted. The multiple forks (4) are rotatably connected to the two first lifting members (3), and at least one fork (4) is connected to each first lifting member (3). The two limit adjustment members (5) are respectively arranged corresponding to the forks (4) connected to the two first lifting members (3). Two limiting adjustment members (5) are disposed between two first lifting members (3); the limiting adjustment members (5) are used to limit the corresponding fork pawl (4) so ​​that the fork pawl (4) remains in a first state; when at least one pallet is placed at a first preset position on the first support frame (1) or at a second preset position above the first support frame (1), the tops of the two limiting adjustment members (5) are adjusted to a first preset height, and the two first lifting members (3) respectively drive the fork pawl (4) to rise to a third preset position higher than the first preset height and matching the corresponding pallet, and the fork pawl (4) rotates to a second state and is inserted into the pallet.

2. The pallet sorting device as described in claim 1, characterized in that: It also includes a conveyor connected to the top of the first support frame (1) for conveying a pallet; the conveyor can convey the pallet to a second preset position above the first support frame (1).

3. A pallet sorting device as described in claim 1 or 2, characterized in that: The limiting adjustment component (5) includes a baffle (51), a cylinder (52), and a first support structure. The bottom end of the cylinder (52) is connected to the first support structure. The baffle (51) is used to limit the corresponding fork (4) so ​​that the fork (4) remains in a first state. The output end of the cylinder (52) is connected to the baffle (51) to drive the baffle (51) to move up and down, so that the top of the baffle (51) moves to a first preset height.

4. The pallet sorting device as described in claim 3, characterized in that: The first support structure includes a first bracket (53) and two symmetrically arranged second brackets (54). The bottom of the cylinder (52) is connected to the first bracket (53). The two ends of the first bracket (53) are detachably connected to the middle of the two adjacent sides of the two second brackets (54).

5. A pallet sorting device as described in claim 4, characterized in that: The first support structure also includes two first limiting blocks (58), which are respectively connected to the upper parts of the two adjacent sides of the two second brackets (54). The two adjacent sides of the two first limiting blocks (58) are respectively provided with first guide grooves, and the two ends of the baffle (51) are respectively inserted into the two first guide grooves.

6. The pallet sorting device as described in claim 4, characterized in that: The first support structure further includes two bases (55), a plurality of first connecting rods (57), and two first support plates (56) respectively corresponding to the two bases (55). The bottoms of the two second brackets (54) are respectively connected to the two first support plates (56). The first connecting rods (57) are respectively connected to a base (55) and the first support plate (56) corresponding to the base (55). Each base (55) is provided with at least one first connecting rod (57).

7. A pallet sorting device as described in claim 6, characterized in that: The first support structure also includes a plurality of first fastening nuts (59), and at least one first mounting through hole (561) is provided through the first support plate (56). The bottom of the first connecting rod (57) is connected to the base (55), and the top of the first connecting rod (57) passes through the first mounting through hole (561). One first fastening nut (59) is screwed onto the part of the first connecting rod (57) located above the first support plate (56), and another first fastening nut (59) is screwed onto the part of the first connecting rod (57) located below the first support plate (56). The two first fastening nuts (59) respectively abut against the first support plate (56).

8. A pallet sorting device as described in claim 7, characterized in that: The first mounting through hole (561) is a strip-shaped hole. The bottom of the first connecting rod (57) is connected to the base (55), and the top can pass through different parts inside the first mounting through hole (561).

9. A pallet sorting device as described in claim 1 or 2, characterized in that: The first driving component (6) includes a first drive shaft (62) rotatably connected to the first support frame (1) and a first drive motor (61) for driving the first drive shaft (62). The first lifting component (3) includes a second limiting block (35), a first connecting block, a second rotating shaft (36), a first connecting structure, a first sprocket (31) disposed at one end of the first drive shaft (62), a first rotating shaft (33) rotatably connected to a second support frame (2), a second sprocket (32) connected to the first rotating shaft (33), and respectively A first chain (34) is fitted onto a first sprocket (31) and a second sprocket (32). A first connecting block is connected to the first chain (34) and a second limiting block (35) respectively. A first connecting structure is connected to the second limiting block (35). A second rotating shaft (36) is rotatably connected to the first connecting structure. A fork (4) is eccentrically connected to the second rotating shaft (36). When the fork (4) rotates to the second state, one end of the fork (4) can be inserted into a tray, and the top of the other end abuts against the bottom of the second limiting block (35).

10. A pallet sorting device as described in claim 9, characterized in that: The first lifting component (3) also includes a first guide rail (38) connected to the second support frame (2), and a first sliding structure (39) connected at one end to the second limiting block (35) and slidably connected at the other end to the first guide rail (38).