Carton separating and classifying device

By designing an automated carton sorting and classification device and using a cylinder-driven push rod to achieve automatic carton sorting, the problems of time-consuming and labor-intensive processes and the risk of falling in the existing technology are solved, efficiency is improved, and energy consumption and maintenance costs are reduced.

CN223367544UActive Publication Date: 2025-09-23SUZHOU SHENGHONG FIBER CO LTD
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Patent Information

Application Number
CN202422520198.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-18
Publication Date
2025-09-23
Estimated Expiration
2034-10-18

AI Technical Summary

Technical Problem

In the existing technology, the carton sorting process is time-consuming, labor-intensive, inefficient, and has the risk of falling, and has high repair and maintenance costs.

Method used

A carton sorting device including a first conveying mechanism, a second conveying mechanism and a pushing mechanism is adopted. A cylinder drives a push rod to automatically push the carton from the first conveying mechanism to the second conveying mechanism, and a guide mechanism and a blocker are combined to achieve stable transmission.

Benefits of technology

It improves lane separation efficiency, reduces the probability of carton drops, reduces labor requirements and maintenance costs, and has a simple structure and low energy consumption.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a carton separating and classifying device which comprises a first conveying mechanism, a plurality of second conveying mechanisms arranged in parallel in the conveying direction of the first conveying mechanism and a plurality of pushing mechanisms used for pushing cartons on the first conveying mechanism to the second conveying mechanisms. One end of the second conveying mechanism extends to the first conveying mechanism, the pushing mechanisms and the second conveying mechanism are arranged in a one-to-one correspondence mode, and each pushing mechanism comprises a push rod arranged in the conveying direction of the second conveying mechanism in a sliding mode and an air cylinder used for driving the push rod to slide in the conveying direction of the second conveying mechanism. The air cylinder comprises a piston rod which can be arranged in a sliding mode, and the push rod is located above the first conveying mechanism and fixedly arranged on the piston rod. According to the carton separating and classifying device, manual operation is not needed during carton separating and classifying, the efficiency and the classifying accuracy rate are greatly improved, a large amount of labor can be saved, and the carton separating and classifying device is stable and reliable in operation, low in energy consumption, simple in structure and convenient to repair and maintain.
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Description

Technical Field

[0001] The utility model relates to the technical field of automatic packaging equipment, in particular to a carton sorting and classification device. Background Art

[0002] The palletizing area of ​​the automated packaging equipment is primarily responsible for grabbing and stacking cartons. Once cartons arrive at designated locations along the lines in zones 1 and 2, they need to be sorted and routed to the designated grabbing area. This process relies on manual labor and semi-automatic boosters, which is time-consuming, labor-intensive, and inefficient. Furthermore, due to the heavy weight of the cartons and wire reels, which totals approximately 36 kg, the manual booster-operated lane separation process can easily cause cartons to fall due to air pressure or equipment failure, posing a significant risk of injury. Furthermore, due to 24 / 7 operation, booster failures are frequent, resulting in high repair and maintenance costs. Utility Model Content

[0003] The purpose of the utility model is to provide a carton sorting and classification device which is labor-saving, stable, efficient and has low energy consumption in view of the deficiencies in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A carton sorting and classification device comprises a first conveying mechanism, a plurality of second conveying mechanisms arranged in parallel along the conveying direction of the first conveying mechanism, and a plurality of pushing mechanisms for pushing cartons on the first conveying mechanism to the second conveying mechanism, one end of the second conveying mechanism extends to the first conveying mechanism, the pushing mechanism and the second conveying mechanism are arranged in a one-to-one correspondence, each of the pushing mechanisms comprises a push rod slidably arranged along the conveying direction of the second conveying mechanism and a cylinder for driving the push rod to slide along the conveying direction of the second conveying mechanism, the cylinder comprises a piston rod slidably arranged, the push rod is located above the first conveying mechanism, and the push rod is fixedly arranged on the piston rod.

[0006] In some embodiments, the pushing mechanism also includes a fixed bracket, the cylinder is fixedly arranged on the fixed bracket, and the pushing mechanism also includes a guide mechanism arranged on the fixed bracket for guiding the sliding of the push rod, the guide mechanism includes a guide rod fixedly arranged on the fixed bracket and a first slider that can be slidably arranged on the guide rod along the length extension direction of the guide rod, and the first slider is fixedly connected to the push rod or the piston rod.

[0007] In some embodiments, the guide rods are respectively provided on opposite sides of the piston rod, and the first sliding block is respectively slidably provided on the guide rods on each side;

[0008] The first sliding blocks on both sides are fixedly connected via a connecting plate, the connecting plate is fixedly connected to the piston rod, and the upper part of the push rod is fixedly connected to the connecting plate.

[0009] In some embodiments, the cylinder is adjustable in position on the fixed bracket, and the sliding direction of the cylinder when adjusting its position is the same as the sliding direction of the push rod.

[0010] In some embodiments, the cylinder includes a cylinder body, one end of the piston rod extends into the cylinder body, and the other end extends to the outside of the cylinder body and is fixedly connected to the push rod; when the cylinder acts on the carton to push it from the first conveying mechanism to the second conveying mechanism, the piston rod slides in the direction of retracting into the cylinder body.

[0011] In some embodiments, the device also includes a blocker for limiting the transfer position of the carton on the first conveying mechanism, and the blocker is arranged at the position of the pushing mechanism, and the blocker is movably arranged relative to the first conveying mechanism; the blocker has a first position and a second position, and when the blocker is in the first position, the blocker blocks the transfer direction of the first conveying mechanism; when the blocker is in the second position, the blocker is away from the transfer direction of the first conveying mechanism.

[0012] In some embodiments, the blocker includes two baffles that are rotatably or slidably arranged. When the blocker is in a first position, the two baffles are close to each other; when the blocker is in a second position, the two baffles are far away from each other.

[0013] In some embodiments, the first conveying mechanism has a first plane supporting the carton and in contact with the bottom of the carton, and the second conveying mechanism has a second plane supporting the carton and in contact with the bottom of the carton, and the height of the second plane is not higher than the height of the first plane.

[0014] In some embodiments, the first transmission mechanism includes a first bracket and a plurality of first transmission rollers rotatably arranged on the first bracket around their own axis, and the plurality of first transmission rollers are sequentially spaced in a front-to-back direction;

[0015] The second transmission mechanism includes a second bracket and a plurality of second transmission rollers rotatably arranged on the second bracket around their own axis. The plurality of second transmission rollers are sequentially arranged at intervals along the left-right direction.

[0016] In some embodiments, the first bracket includes first support plates respectively arranged on opposite sides, and the two ends of the first transmission roller are rotatably connected to the first support plates on the corresponding side. The first support plate arranged close to the second transmission mechanism is provided with a groove extending downward from the upper end surface at a position corresponding to the second transmission mechanism, and the height of the bottom of the groove is not higher than the height of the first plane.

[0017] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0018] (1) The device can automatically push cartons from a first conveying mechanism to a different second conveying mechanism through a pushing mechanism, and can operate continuously for a long time without manual operation, thereby greatly improving efficiency and classification accuracy and saving a lot of labor;

[0019] (2) The way in which the pushing mechanism in the device pushes the cartons can effectively reduce the probability of cartons falling and reduce product loss.

[0020] (3) The device operates stably and reliably with low energy consumption, and has a simple structure, making it easy to repair and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attachment Figure 1 This is one of the three-dimensional schematic diagrams of the carton sorting and classification device of this embodiment;

[0022] Attachment Figure 2 For attachment Figure 1 A partial enlarged schematic diagram in the middle;

[0023] Attachment Figure 3 This is the second three-dimensional schematic diagram of the carton sorting device of this embodiment;

[0024] Attachment Figure 4 For attachment Figure 3 A partial enlarged schematic diagram in the middle;

[0025] Attachment Figure 5 Schematic diagram of the pushing mechanism of this embodiment;

[0026] Attachment Figure 6 Schematic front view of the pushing mechanism of this embodiment.

[0027] Among them: 1. First transmission mechanism; 11. First transmission roller; 121. First bottom bracket; 122. First support plate; 122a. Slot; 2. Second transmission mechanism; 21. Second transmission roller; 221. Second bottom bracket; 222. Second support plate; 3. Pushing mechanism; 31. Fixed bracket; 311. Second slider; 321. Cylinder body; 321a. Slide rail; 322. Piston rod; 33. Push rod; 331. Side plate; 332. Upper connecting rod; 333. Lower connecting rod; 34. Guide rod; 35. First slider; 36. Connecting plate; 41. Baffle; 42. Fixed seat; 43. Driving mechanism; 5. Carton. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. The transmission direction of the first transmission mechanism is the front-to-back direction, and the transmission direction of the second transmission mechanism is the left-to-right direction. This is merely for the convenience of describing the present invention and to simplify the description. It does not indicate or imply that the device or device referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0030] like Figure 1 and Figure 3 As shown, the carton sorting device of the present invention includes a first conveying mechanism 1, a second conveying mechanism 2 and a pushing mechanism 3.

[0031] The first conveying mechanism 1 conveys the cartons 5 in the front-to-back direction. In this embodiment, the first conveying mechanism 1 includes a first bracket and a plurality of first conveying rollers 11 rotatably mounted on the first bracket about their respective axes. The plurality of first conveying rollers 11 are sequentially spaced apart in the front-to-back direction. When each first conveying roller 11 rotates in the same direction about its own axis, the cartons 5 are conveyed in the front-to-back direction.

[0032] The first bracket includes a first bottom bracket 121 and first support plates 122 respectively arranged on opposite sides of the first bottom bracket 121. Each first transmission roller 11 is arranged between the first support plates 122 on both sides, and the two ends of the first transmission roller 11 are respectively rotatably connected to the first support plates 122 on the corresponding side.

[0033] The second conveyor mechanism 2 conveys cartons 5 in the left-right direction. In this embodiment, the second conveyor mechanism 2 includes a second bracket and a plurality of second conveyor rollers 21 rotatably mounted on the second bracket about their respective axes. The plurality of second conveyor rollers 21 are sequentially spaced apart in the left-right direction. When each second conveyor roller 21 rotates in the same direction about its own axis, the cartons 5 are conveyed in the left-right direction.

[0034] The second bracket includes a second bottom bracket 221 and second support plates 222 respectively arranged on opposite sides of the second bottom bracket 221. Each second transmission roller 21 is arranged between the second support plates 222 on both sides, and the two ends of the second transmission roller 21 are respectively rotatably connected to the second support plates 222 on the corresponding side.

[0035] Multiple second transmission mechanisms 2 are spaced apart along the front-to-back direction, with one end of each second transmission mechanism 2 extending to the position of the first transmission mechanism 1. Specifically, the second support plate 222 extends in the left-right direction until it abuts against the first support plate 122 located near the second transmission mechanism 2, or there is a small distance between the two.

[0036] The first conveying mechanism 1 has a first plane that supports the carton 5 and contacts the bottom of the carton 5, and the second conveying mechanism 2 has a second plane that supports the carton 5 and contacts the bottom of the carton 5, with the height of the second plane not exceeding that of the first plane. In this embodiment, the first plane is formed by the uppermost generatrix of each first conveying roller 11, and the second plane is formed by the uppermost generatrix of each second conveying roller 21. During the rotation of the first conveying roller 11 and the second conveying roller 21, the uppermost generatrix of the first conveying roller 11 and the uppermost generatrix of the second conveying roller 21 both change, but the first plane and the second plane remain unchanged. The first support plate 122 disposed near the second conveying mechanism 2 is provided with a slot 122a at a position corresponding to the second conveying mechanism 2. The slot 122a extends downward from the upper end surface of the first support plate 122, and the bottom height of the slot 122a is not exceeding that of the first plane. In this way, when the carton 5 is transferred from the first conveyor mechanism 1 to the position corresponding to the second conveyor mechanism 2, a force is applied to the carton 5 in the direction of the second conveyor mechanism 2, so that the carton 5 can be pushed from the first conveyor mechanism 1 to the second conveyor mechanism 2. Each second conveyor mechanism 2 is used to transfer different types of cartons 5.

[0037] The pushing mechanism 3 is used to apply a force to the carton 5 in the direction of the second conveying mechanism 2 to push the carton 5 from the first conveying mechanism 1 to the second conveying mechanism 2. There are multiple pushing mechanisms 3 corresponding to the second conveying mechanisms 2.

[0038] like Figure 5 and Figure 6 As shown, the pushing mechanism 3 includes a fixed bracket 31, a cylinder and a push rod 33. The push rod 33 can be slidably arranged along the transmission direction of the second transmission mechanism 2. The cylinder is arranged on the fixed bracket 31 and is used to drive the push rod 33 to slide along the transmission direction of the second transmission mechanism 2.

[0039] The cylinder includes a cylinder body 321 and a piston rod 322. The cylinder body 321 is fixedly mounted on the fixed bracket 31. One end of the piston rod 322 extends into the cylinder body 321 and is slidable relative to the cylinder body 321. The other end of the piston rod 322 extends outside the cylinder body 321. The push rod 33 is located above the first transmission mechanism 1 and is fixed to the end of the piston rod 322 that extends into the cylinder body 321. When the piston rod 322 slides relative to the cylinder body 321, it drives the push rod 33 to slide synchronously.

[0040] In this embodiment, when the air cylinder acts on the carton 5, pushing it from the first conveyor mechanism 1 to the second conveyor mechanism 2, the piston rod 322 slides toward the cylinder body 321. Specifically, the force exerted by the air cylinder during the pushing of the carton 5 is a tensile force. This allows the fixed bracket 31 and the air cylinder to be positioned on the side of the second conveyor mechanism 2, resulting in a compact overall structure and a small footprint. Furthermore, the force exerted on the piston rod 322 is tensile, making it less susceptible to bending and deformation, thereby extending the service life of the piston rod 322.

[0041] The pushing mechanism 3 also includes a guiding mechanism, which is arranged on the fixed bracket 31 and is used to guide the sliding of the push rod 33 so that the carton 5 can be stably pushed from the first conveying mechanism 1 to the second conveying mechanism 2.

[0042] The guide mechanism includes a guide rod 34 fixedly mounted on the fixed bracket 31 and a first slider 35 slidably mounted on the guide rod 34 along the longitudinal extension direction of the guide rod 34 . The first slider 35 is fixedly connected to the push rod 33 or the piston rod 322 .

[0043] In this embodiment, the guide rods 34 are respectively provided on two opposite sides of the piston rod 332 , and the first sliding blocks 35 are respectively slidably provided on the guide rods 34 on each side.

[0044] The first sliders 35 on both sides are fixedly connected by a connecting plate 36, and the connecting plate 36 is fixedly connected to the piston rod 332, so that the sliding consistency of the first sliders 35 on both sides can be ensured. The upper part of the push rod 33 is fixedly connected to the connecting plate 36.

[0045] The lower end of the push rod 33 extends downward to below the center of gravity of the carton 5, so that the carton 5 is not prone to the risk of overturning when the carton 5 is pushed by the push rod 33.

[0046] In this embodiment, the push rod 33 includes side plates 331 provided at the front and rear ends, an upper connecting rod 332 connected between the upper ends of the side plates 331, and a lower connecting rod 333 connected between the lower ends of the side plates 331. The upper end of each side plate 331 is fixedly connected to the connecting plate 36.

[0047] Each side panel 331 has a first side facing the carton 5 and a second side opposite the first side. The first side is perpendicular to the first plane, so that when the carton 5 is pushed by the push rod 33, the first side can better fit the carton 5, so that the force of the push rod 33 can be applied to the carton 5 to the greatest extent, thereby reducing energy consumption.

[0048] The second side surface extends obliquely downward from the top toward the first side surface, so that the side plate 331 is easily fixedly connected to the connecting plate 36 and the lower connecting rod 333 .

[0049] Preferably, the cylinder is adjustable on the fixed bracket 31 , and the installation position of the cylinder is adjusted by sliding the cylinder relative to the fixed bracket 31 . The sliding direction of the cylinder when adjusting the position is the same as the sliding direction of the push rod 33 .

[0050] Specifically, a slide rail 321a extending along the sliding direction of the cylinder is provided on the cylinder body 321, and a second slider 311 is fixedly provided on the fixed bracket 31. The second slider 311 is slidably connected to the slide rail 321a. The installation position of the cylinder on the fixed bracket 31 is adjusted by making the second slider 311 and the slide rail 321a slide relative to each other.

[0051] The device also includes a stopper for limiting the transfer position of the carton 5 on the first conveying mechanism 1, so that the carton 5 can stay at the set position and be stably pushed from the first conveying mechanism 1 to the second conveying mechanism 2 by the pushing mechanism. The stopper is respectively provided at the position of each pushing mechanism 3 and is movable relative to the first conveying mechanism 1.

[0052] The blocker has a first position and a second position. When the blocker is in the first position, the blocker blocks the conveying direction of the first conveying mechanism 1, so that the carton 5 cannot continue to be conveyed along the current direction on the first conveying mechanism 1. When the blocker is in the second position, the blocker is away from the conveying direction of the first conveying mechanism 1, and the carton 5 can continue to be conveyed along the current direction on the first conveying mechanism 1.

[0053] Specifically, the blocker includes two rotating or sliding baffles 41. When the blocker is in a first position, both baffles 41 move to above the area where the first transport roller 11 is located, and the two baffles 41 are close to each other. When the blocker is in a second position, both baffles 41 move to outside the area where the first transport roller 11 is located, and the two baffles 41 move away from each other.

[0054] The blocker further includes a fixing seat 42 , which is respectively arranged on the outer side of the first support plate 122 on each side, and the two baffles 41 are respectively rotatably or slidably arranged on the fixing seat 42 on the corresponding side.

[0055] The blocker also includes a driving mechanism 43 for driving the baffle 41 to rotate or slide relative to the fixing seat 42. In this embodiment, the driving mechanism adopts a cylinder, and in other embodiments, the driving mechanism can also adopt a motor or the like.

[0056] The stopper is not limited to the structure of this embodiment. For example, the stopper may be a block that can be raised and lowered. When the stopper is in the second position, the block is located below the first transport roller 11. When the stopper is in the first position, the block extends upward from the space between two adjacent first transport rollers 11 to above the first transport roller 11.

[0057] The working principle of the carton sorting device is as follows:

[0058] In the initial position, the blockers at each position are in the second position, and most of the piston rod 322 of the cylinder extends out of the cylinder body 321.

[0059] The carton 5 is placed on the first conveying roller 11, and the first conveying roller 11 rotates to convey the carton 5 forward. During the conveying process, the type of the carton 5 is detected to control the action of the blocker at the corresponding type position to switch from the second position to the first position.

[0060] When the carton 5 is transported to the point where it abuts the baffle 41, the first transport roller 11 stops rotating. At this point, the push rod 33 is located on the side of the carton 5 away from the second transport mechanism 2. The air cylinder actuates, causing the piston rod 322 to slide toward the cylinder body 321, driving the push rod 33 to slide synchronously in the same direction. The push rod 33 acts on the carton 5, pushing it from the first transport roller 11 to the second transport roller 21. As the push rod 33 pushes the carton 5, the second transport roller 21 rotates, making it easier for the carton 5 to be pushed onto the second transport roller 21 and transported there.

[0061] A sensing device may be provided on the second conveying mechanism 2 or the pushing mechanism 3. During the process of the cartons 5 being conveyed by the second conveying roller 21, the sensing device may also be used to detect whether the cartons 5 on the second conveying mechanism 2 are full. When it is detected that the cartons 5 on the second conveying mechanism 2 are full, the cylinder stops operating, and the push rod 33 stops pushing the cartons 5 onto the second conveying mechanism 2.

[0062] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A carton sorting device, characterized by: It includes a first conveying mechanism, a plurality of second conveying mechanisms arranged in parallel along the conveying direction of the first conveying mechanism, and a plurality of pushing mechanisms for pushing cartons on the first conveying mechanism to the second conveying mechanism, one end of the second conveying mechanism extends to the first conveying mechanism, and the pushing mechanism and the second conveying mechanism are arranged in a one-to-one correspondence. Each of the pushing mechanisms includes a push rod that can be slidably arranged along the conveying direction of the second conveying mechanism and a cylinder for driving the push rod to slide along the conveying direction of the second conveying mechanism, the cylinder includes a piston rod that can be slidably arranged, the push rod is located above the first conveying mechanism, and the push rod is fixedly arranged on the piston rod.

2. The carton sorting device according to claim 1, characterized in that: The pushing mechanism also includes a fixed bracket, the cylinder is fixedly arranged on the fixed bracket, and the pushing mechanism also includes a guide mechanism arranged on the fixed bracket for guiding the sliding of the push rod, the guide mechanism includes a guide rod fixedly arranged on the fixed bracket and a first slider slidably arranged on the guide rod along the length extension direction of the guide rod, the first slider is fixedly connected to the push rod or the piston rod.

3. The carton sorting device according to claim 2, characterized in that: The guide rods are respectively arranged on opposite sides of the piston rod, and the first sliding blocks are respectively slidably arranged on the guide rods on each side; The first sliding blocks on both sides are fixedly connected via a connecting plate, the connecting plate is fixedly connected to the piston rod, and the upper part of the push rod is fixedly connected to the connecting plate.

4. The carton sorting device according to claim 2, characterized in that: The cylinder is arranged on the fixing bracket in an adjustable manner, and the sliding direction of the cylinder when adjusting its position is the same as the sliding direction of the push rod.

5. The carton sorting device according to claim 1, characterized in that: The cylinder includes a cylinder body, one end of the piston rod extends into the cylinder body, and the other end extends to the outside of the cylinder body and is fixedly connected to the push rod; when the cylinder acts on the carton to push it from the first conveying mechanism to the second conveying mechanism, the piston rod slides in the direction of retracting into the cylinder body.

6. The carton sorting device according to claim 1, characterized in that: The device also includes a blocker for limiting the transfer position of the carton on the first conveying mechanism. The blocker is arranged at the position of the pushing mechanism and is movably arranged relative to the first conveying mechanism. The blocker has a first position and a second position. When the blocker is in the first position, the blocker blocks the transfer direction of the first conveying mechanism; when the blocker is in the second position, the blocker is away from the transfer direction of the first conveying mechanism.

7. The carton sorting device according to claim 6, characterized in that: The blocker includes two baffles that are rotatably or slidably arranged. When the blocker is in a first position, the two baffles are close to each other; when the blocker is in a second position, the two baffles are far away from each other.

8. The carton sorting device according to claim 1, characterized in that: The first transport mechanism has a first plane supporting the carton and in contact with the bottom of the carton, and the second transport mechanism has a second plane supporting the carton and in contact with the bottom of the carton, wherein the height of the second plane is not higher than that of the first plane.

9. The carton sorting device according to claim 8, characterized in that: The first transmission mechanism includes a first bracket and a plurality of first transmission rollers rotatably arranged on the first bracket around their own axis, wherein the plurality of first transmission rollers are sequentially spaced in a front-to-back direction; The second transmission mechanism includes a second bracket and a plurality of second transmission rollers rotatably arranged on the second bracket around their own axis. The plurality of second transmission rollers are sequentially arranged at intervals along the left-right direction.

10. The carton sorting device according to claim 9, characterized in that: The first bracket includes first support plates respectively arranged on opposite sides, and the two ends of the first transmission roller are rotatably connected to the first support plates on the corresponding side. The first support plate arranged close to the second transmission mechanism is provided with a groove extending downward from the upper end surface at a position corresponding to the second transmission mechanism, and the height of the bottom of the groove is not higher than the height of the first plane.