Sorting machine and sorting system

Abstract

This invention discloses a sorting machine and a sorting system. The sorting machine includes a support, a conveying assembly, and a marking assembly. The conveying assembly is connected to the support and includes a conveyor belt adapted to convey packages to be marked from a first position to a second position. A gap is provided between the first and second positions on the conveyor belt. The marking assembly is connected to the support and is located below the conveying surface of the conveyor belt. The marking assembly is adapted to perform inkjet marking on the bottom of the packages passing over it through the gap. This sorting machine solves the problem of inconsistent printing conditions caused by differences in package size in existing top-inkjet printing methods. This solution achieves uniform printing results without complex mechanical structures. Furthermore, the bottom of the package is naturally flattened due to the support of the conveyor belt, thus enabling neat and clear markings to be printed on the flat surface beneath even flexible packages.

Description

Technical Field

[0001] This invention relates to the field of logistics sorting, and particularly to a sorting machine and sorting system. Background Technology

[0002] In the fields of logistics sorting and warehouse management, sorting machines are the core equipment for realizing the rapid classification and circulation of packages. In order to facilitate subsequent identification, traceability and classification management, packages usually need to be marked during the sorting process.

[0003] Currently, existing sorting machines mainly use two methods for marking packages: one is label pasting, where labels are printed by a label printer and then pasted onto the package surface. This method requires additional consumables such as labels and adhesives, resulting in higher marking costs. Furthermore, the flatness and cleanliness of the package surface, as well as the standardization of the pasting operation, can affect the label pasting effect, easily leading to problems such as label detachment or misalignment, which in turn affects the subsequent recognition accuracy. The other method is inkjet marking, where the inkjet printer is placed above the conveyor belt to mark the top of passing packages. However, this method has significant drawbacks: due to the varying sizes and random placement of logistics packages, the distance between the top printing surface of each package and the inkjet printhead varies. This distance difference directly leads to inconsistent clarity and uniformity of the inkjet printing. Especially when the package is small, the distance between the printhead and the top of the package is greater, resulting in scattered ink and poor printing quality, failing to meet the requirements for clear marking.

[0004] Therefore, given the problems of high cost, poor printing effect, complex structure and insufficient operational stability of existing sorting machine package marking methods, how to design a sorting machine that can achieve uniform and stable inkjet marking for packages of different sizes, and has a simple structure and low cost, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The main objective of this invention is to provide a sorting machine and sorting system that offers a simple structure and consistent printing results.

[0006] To achieve the above objectives, the present invention proposes a sorting machine, characterized in that it comprises: support; A conveying assembly, connected to a support frame, includes a conveyor belt adapted to convey a package to be marked from a first position to a second position, with a gap between the first and second positions. A marking component, connected to a support, is positioned below the conveyor surface of the conveyor belt and is adapted to inkjet mark the bottom of packages passing over it through gaps.

[0007] In some embodiments, the conveyor belt includes a first annular belt and a second annular belt, both of which are arranged around a transverse axis and are spaced apart laterally, with the gap between them located between the first and second annular belts.

[0008] In some embodiments, the conveying assembly further includes a first conveying roller and a second conveying roller; The first conveyor roller is located within the first annular belt and the second annular belt and abuts against the sides of the first annular belt and the second annular belt near the first position, respectively; the second conveyor roller is located within the first annular belt and the second annular belt and abuts against the sides of the first annular belt and the second annular belt near the second position, respectively; At least one of the first and second conveyor rollers is a drive roller for driving the first and second annular belts to rotate.

[0009] In some embodiments, the conveying assembly further includes a third conveying roller and a fourth conveying roller; The third conveyor roller is located within the first and second annular belts and abuts against the first and second annular belts respectively, and is located below the first conveyor roller; the fourth conveyor roller is located within the first and second annular belts and abuts against the first and second annular belts respectively, and is located below the second conveyor roller. Viewed along the transverse axis, the first and second annular bands together enclose a receiving space, and the marking component is located within the receiving space.

[0010] In some embodiments, the first conveying roller and the second conveying roller are each provided with a first annular groove, and the inner side of the first annular belt is provided with a first limiting protrusion. The first limiting protrusion cooperates with the two first annular grooves to limit the axial position of the first annular belt along the transverse axis. And / or, Both the first and second conveyor rollers are provided with a second annular groove, and the inner side of the second annular belt is provided with a second limiting protrusion. The second limiting protrusion cooperates with the two second annular grooves to limit the axial position of the second annular belt along the transverse axis.

[0011] In some embodiments, the marking component includes a sensing module, an inkjet module, and a photocuring module, which are arranged sequentially along the conveying direction of the conveying component. The sensing module is used to sense the package above it, the inkjet module is used to mark the package above it with inkjet based on the sensing result of the sensing module, and the photocuring module is used to photocur the ink of the inkjet marking. The inkjet module includes a first printhead and a second printhead. The ink ejected by the first printhead is of a different color than the ink ejected by the second printhead. The sensing module can sense the color of the outer packaging of the package. The inkjet module selects a printhead with an ink color different from that of the outer packaging to mark the package with inkjet ink.

[0012] In some embodiments, the first annular belt includes a first conveyor wall at the upper end for conveying packages, and the second annular belt includes a second conveyor wall at the upper end for conveying packages, the first conveyor wall and the second conveyor wall being disposed opposite each other at a lateral interval. The first conveying wall is inclined toward the second conveying wall, and the second conveying wall is inclined toward the first conveying wall, so that the distance between the first conveying wall and the second conveying wall gradually increases from bottom to top.

[0013] In some embodiments, the conveying component further includes a third annular belt located between the first annular belt and the second annular belt, and the third annular belt is located at the front end of the marking component; The third annular belt rotates synchronously with the first and second annular belts to transport packages; or, the sorting machine may also include a position detection component, which, when the position detection component detects that a package is off-center, drives the third annular belt to rotate in the opposite direction to the first and second annular belts, so that the third annular belt and one of the first or second annular belts jointly drive the package to rotate. When the package rotates to a position close to the center, the third annular belt is driven to rotate synchronously with the first and second annular belts.

[0014] In some embodiments, the sorting machine is used for last-mile parcel delivery. The sorting machine also includes a signal receiving module and a processing module. The signal receiving module is used to receive the address information of each parcel sequentially transmitted by the conveying component, and the signal receiving module is also used to receive numbering rules. The processing module outputs a number according to the address information and the numbering rules, and the marking component marks the parcel with inkjet ink according to the number.

[0015] An embodiment of the second aspect of this application also provides a sorting system, including: The sorting machine of any of the above, and, Distribution facilities are used to transport packages to sorting machines. Storage mechanisms are used to categorize and store packages that have been marked with inkjet printing.

[0016] Compared with the prior art, the beneficial effects of the present invention are: In the technical solution of this invention, the marking component is connected to the bracket and positioned in the gap below the conveyor belt's conveying surface, for inkjet marking of the bottom of packages to be marked as they pass over it. Since the bottoms of all packages to be marked are supported by the conveyor belt's conveying surface, the distance between the marking component's inkjet structure and the bottom of each package remains constant regardless of the package's size or placement. This distance can be set as a suitable distance for inkjet printing, thereby solving the problem of inconsistent printing conditions caused by differences in package size in existing top-inkjet printing methods, and thus achieving a uniform printing effect. Furthermore, the bottom of the package is naturally flattened due to the support of the conveyor belt, thus providing better printing conditions even for flexible packages, allowing the marking component to print neat and clear marks on the flat surface beneath the package.

[0017] Meanwhile, this structure eliminates the need for additional drive structures and distance sensors. By optimizing the installation position of the marking components, it achieves inkjet marking at a uniform distance, reducing the number of moving parts, simplifying the overall structure of the sorting machine, minimizing the possibility of equipment failure, and improving operational stability. Furthermore, compared to label pasting methods, it eliminates the need for consumables such as labels and adhesives, reducing marking costs.

[0018] Furthermore, the marking components are installed below the conveyor surface of the conveyor belt, which can utilize the unused space at the bottom of the conveyor belt. There is no need to reserve additional installation space above the conveyor belt, making the overall structure of the sorting machine more compact, reducing the space occupied by the equipment, and adapting to different installation scenarios. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a perspective view of a sorting machine according to an embodiment of the present invention; Figure 2 This is a top view schematic diagram of a sorting machine according to an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a portion of point A in the middle; Figure 4 This is an exploded view of a sorting machine according to one embodiment of the present invention; Figure 5 for Figure 4 A magnified view of a portion of point B in the middle; Figure 6This is a three-dimensional schematic diagram of the sorting machine behind the hidden support in one embodiment of the present invention; Figure 7 This is a first side view schematic diagram of the sorting machine behind the hidden support in one embodiment of the present invention; Figure 8 This is a second side view schematic diagram of the sorting machine behind the hidden support in one embodiment of the present invention; Figure 9 This is a second side view schematic diagram of the sorting machine behind the hidden support in another embodiment of the present invention; Figure 10 This is a top view of the sorting machine behind the hidden support in another embodiment of the present invention; Figure 11 This is a schematic diagram of the framework of a sorting system in one embodiment of the present invention.

[0021] Explanation of icon numbers: 100-Sorting Machine; 110-Standard; 111 - Anchor bolt; 120 - Transmission component; 121-Conveyor belt; 1210-Conveyor surface; 1211-First annular belt; 12111-First limiting protrusion; 12112-First conveyor wall; 1212-Second annular belt; 12121-Second limiting protrusion; 12122-Second conveyor wall; 1213-Third annular belt; 122-Gap; 123 - First conveyor roller; 1231 - First annular groove; 124 - Second conveyor roller; 1243 - Second annular groove; 125 - Third conveyor roller; 126 - Fourth conveyor roller; 127 - Accommodation space; 1291 - First position; 1292 - Second position; 130 Marker Component; 131 - Sensing module; 132 - Inkjet module; 1321 - First printhead; 1322 - Second printhead; 133 - Photopolymerization module; 140 - Controller; 150 - Position detection component; 160 - Signal receiving module; 170 - Processing Module; 200-Sorting System; 210 - Distribution organization; 220 - Storage organization.

[0022] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, lateral, longitudinal, etc.), these directional indications are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. When a direction reference is introduced in a specific embodiment, unless the direction is specifically limited to one direction, it can be one-way or two-way (two parallel and opposite directions). Whether it is one-way or two-way depends on what those skilled in the art can achieve. When the direction reference is two-way, it should be considered that two parallel and different embodiments have been introduced simultaneously.

[0025] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0026] In logistics sorting, warehousing management, and last-mile delivery, sorting machines are core equipment for the rapid classification and circulation of packages. To facilitate subsequent identification, traceability, and classification management, packages are usually marked during the sorting process. Related technologies for package marking in sorting machines mainly fall into two categories: one is label pasting, which requires additional input of labels, adhesives, and other consumables, resulting in high marking costs. Furthermore, the flatness and cleanliness of the package surface directly affect the label pasting effect, easily leading to problems such as label detachment and misalignment, affecting subsequent identification accuracy. The other is top inkjet printing, where the inkjet printer is placed above the conveyor belt to mark the top of the package. However, due to the varying sizes and random placement of logistics packages, the distance between the top of each package and the inkjet printhead is different, directly causing inconsistent printing clarity and uniformity. This is especially problematic for small packages where the printhead distance is too far, resulting in scattered ink and extremely poor printing quality.

[0027] Initially, the applicant addressed the aforementioned deficiencies by adding a drive structure and a distance sensor to the print head. The distance sensor identifies the package height and adjusts the print head position to ensure consistent spacing between the print head and the printing surface of each package. However, this improvement adds an extra drive structure and sensing components, which not only complicates the overall structure of the equipment, increasing manufacturing costs and assembly difficulty, but also makes the moving parts and sensors prone to failure during long-term, high-frequency operation. This results in poor equipment stability, high maintenance costs, and an inability to meet the long-term, efficient, and stable package marking requirements of logistics scenarios.

[0028] In view of this, see Figures 1-11 This embodiment provides a sorting machine 100. Through optimization of its core structure, it solves the core pain points of inconsistent inkjet marking effects and poor print quality on packages of different sizes without adding complex moving parts. It also simplifies the equipment structure, reduces operating costs, and improves operational stability. The sorting machine 100 can also be used independently for small-batch package sorting and printing; it can also be used in a large sorting station's sorting system 200, serving as one module in the entire production line of the sorting system 200.

[0029] This embodiment provides a sorting machine 100, as shown in the reference... Figure 1 Figure 4 shows that the sorting machine 100 includes a support frame 110, a conveying assembly 120, and a marking assembly 130. The support frame 110 is the overall load-bearing base of the sorting machine 100, and can be formed by welding steel profiles or splicing aluminum alloy profiles. Anchor bolts 111 or casters can be installed at the bottom of the support frame 110 to adapt to ground installation or equipment movement requirements. The overall structural strength of the support frame 110 must meet the load requirements of the installation of the conveying assembly 120 and the marking assembly 130, as well as the packaging and conveying process.

[0030] The conveying assembly 120 is connected to the support 110. The conveying assembly 120 includes a conveyor belt 121, which is adapted to convey the package to be marked from a first position 1291 to a second position 1292. A gap 122 is provided between the first position 1291 and the second position 1292. Specifically, in this embodiment, see... Figure 1 The first position 1291 can be the entire front area of ​​the upper end of the conveyor belt 121, serving as the loading position for packages. After the package to be marked is sent into the first position 1291 by the upstream equipment, it is carried by the conveyor belt 121 and conveyed to the second position 1292. The second position 1292 is the entire rear area of ​​the upper end of the conveyor belt 121, serving as the unloading position for packages. Packages that have completed inkjet marking can be sent to the downstream sorting station or directly collected by the collection device via the second position 1292. The conveying surface 1210 of the conveyor belt 121 refers to the wall surface of the conveyor belt 121 used for conveying packages. When the conveyor belt 121 moves in a circular motion around the horizontal axis, since the conveyor belt 121 only moves to the upper facing wall surface to support the package, the conveyor surface 1210 is the upper wall surface that can support the package when the conveyor belt 121 moves to the upper position. When the conveyor belt 121 moves in a racetrack-shaped circular motion around the vertical axis, since the entire upper wall surface of the conveyor belt 1210 can simultaneously support the package, the conveyor surface 1210 is the wall surface facing upwards from the conveyor belt 121. See also Figure 1 This embodiment uses the example of the conveyor belt 121 moving cyclically around the transverse axis for illustration.

[0031] See Figures 1-4 In some embodiments, the gap 122 is provided through the package conveying direction. The width of the gap 122 (horizontal direction perpendicular to the package conveying direction) needs to ensure that the inkjet range of the marking component 130 is completely covered, while preventing the package from falling off the gap 122 during conveying. In this embodiment, the width of the gap 122 can preferably be set to 10mm-100mm. For example, the width of the gap 122 can be 10mm, 20mm, 40mm, 60mm, 80mm, or 100mm, etc. In practice, it can also be adjusted according to the minimum size of the package and the printing width adaptability of the inkjet module 132 of the marking component 130. The marking component 130 is connected to the bracket 110 and is located below the conveying surface 1210 of the conveyor belt 121. The marking component 130 is adapted to inkjet mark the bottom of the package passing above it through the gap 122.

[0032] Specifically, the inkjet end of the marking component 130 is positioned facing upwards directly opposite the gap 122, and the distance between the inkjet end of the marking component 130 and the conveying surface 1210 of the conveyor belt 121 is fixed. This distance can be preset to the optimal distance for inkjet printing based on the characteristics of the inkjet ink and the printing accuracy requirements.

[0033] In related technologies, top inkjet printing suffers from inconsistent spacing between the printhead and the printing surface due to variations in package size, while label application methods are hampered by high consumable costs and easy detachment. Initial improvement solutions, however, face challenges due to complex structures and poor operational stability. To address these issues, this embodiment abandons the approach of adding additional drive and sensing components. Instead, it employs a technical solution where the marking component 130 is positioned below the conveyor belt 121. Utilizing the support of the conveyor belt 121 on the bottom of the package, the spacing between the bottom printing surface and the inkjet nozzle remains constant for all packages—regardless of package size or placement, the bottom always adheres to the conveyor surface 1210, thus ensuring the printing spacing is always at the preset optimal distance. The core working principle of this embodiment is as follows: after the package to be marked is fed into the conveyor belt 121 from the first position 1291, it is conveyed to the second position 1292. When the package passes over the gap 122, the marking component 130 performs inkjet marking on the bottom of the package through the gap 122. This solution fundamentally solves the problem of inconsistent inkjet spacing at the top. It also eliminates the need for additional moving parts, simplifying the equipment structure, reducing potential failure points, improving equipment operational stability, and lowering manufacturing and maintenance costs. Compared to label pasting methods, it eliminates the need for consumables such as labels and adhesives, requiring only inkjet ink for marking, significantly reducing the long-term operating costs of packaging and marking.

[0034] This structural design completely solves the problem of inconsistent printing spacing and inconsistent printing effects caused by differences in package size in top-jet printing methods in related technologies. It achieves consistent inkjet printing results for all packages while ensuring optimal print clarity for each package. Furthermore, this solution eliminates the need for additional drive structures, distance sensors, or other moving parts and electrical components. By simply optimizing the installation position of the marking component 130, uniform inkjet marking spacing is achieved, significantly reducing the number of moving parts, simplifying the overall structure of the sorting machine 100, lowering manufacturing costs and assembly difficulty, reducing potential failure points, and improving the stability of long-term, high-frequency operation. Compared to label pasting methods, this solution eliminates the need for consumables such as labels and adhesives; only inkjet ink is required for marking, significantly reducing the long-term operating costs of package marking. In addition, the marking component 130 is installed below the conveyor surface 1210 of the conveyor belt 121, which can make full use of the idle space at the bottom of the conveyor belt 121. There is no need to reserve additional installation and movement space above the conveyor belt 121, making the overall structure of the sorting machine 100 more compact, reducing the footprint of the equipment, and adapting to various narrow installation scenarios such as express delivery outlets, warehousing centers, and last-mile delivery stations.

[0035] In some embodiments, refer to Figures 3-4The conveyor belt 121 includes a first annular belt 1211 and a second annular belt 1212. Both the first annular belt 1211 and the second annular belt 1212 are arranged around a transverse axis and are spaced apart laterally, with a gap 122 located between them. Specifically, "transverse" refers to the horizontal direction perpendicular to the package conveying direction. The first annular belt 1211 and the second annular belt 1212 are arranged side-by-side and spaced apart laterally, with their conveying surfaces 1210 on the same horizontal plane, together forming the package's carrying and conveying surface. The gap 122 is formed by the area between them and extends continuously along the package conveying direction, providing a complete inkjet window for the marking component 130. The first annular belt 1211 and the second annular belt 1212 can be made of non-slip, wear-resistant rubber or PU material, or high-strength nylon material, to ensure that the package does not slip or shift during conveying. The gaps 122 naturally formed by the spacing of the double-ring belts require no additional processing, effectively reducing the processing difficulty and manufacturing cost of the conveyor belt 121. Furthermore, the double-ring belts are arranged laterally at intervals, keeping their conveying surfaces on the same horizontal plane. This not only stably supports various packages but also provides a continuous inkjet window for the marking component 130, ensuring that the inkjet range completely covers the bottom of the package and guarantees no omissions in marking. Simultaneously, compared to a single-piece conveyor belt, the double-ring belt structure allows for easier tension adjustment, effectively reducing slippage and deviation, improving the stability of package conveying, and indirectly ensuring the accuracy of inkjet marking. In other embodiments, the conveyor belt 121 can also be a single mesh belt with multiple mesh openings. Each mesh opening located above the marking component 130 can be the aforementioned gap 122. In this embodiment, the marking component 130 can perform inkjet marking when the mesh openings move above the inkjet nozzles. Therefore, in this solution, the conveyor belt 121 can be a single unit, resulting in fewer parts, easier installation, and a more compact structure.

[0036] Reference Figures 1-4In some embodiments, the conveying assembly 120 further includes a first conveying roller 123 and a second conveying roller 124. The first conveying roller 123 is located within the first annular belt 1211 and the second annular belt 1212 and abuts against the sides of the first annular belt 1211 and the second annular belt 1212 near the first position 1291, respectively. The second conveying roller 124 is located within the first annular belt 1211 and the second annular belt 1212 and abuts against the sides of the first annular belt 1211 and the second annular belt 1212 near the second position 1292, respectively. Both the first conveying roller 123 and the second conveying roller 124 are rotatably connected to the bracket 110, and their axes are arranged parallel to each other in the transverse direction. The first conveying roller 123 is the front roller, and the second conveying roller 124 is the rear roller. The first annular belt 1211 and the second annular belt 1212 are together sleeved on the outside of the first conveying roller 123 and the second conveying roller 124, forming a dual-belt synchronous conveying structure.

[0037] Reference Figures 1-4 In some embodiments, at least one of the first conveyor roller 123 and the second conveyor roller 124 is a drive roller for driving the first annular belt 1211 and the second annular belt 1212 to rotate. In this embodiment, the second conveyor roller 124 can be a drive roller, and one end of the second conveyor roller 124 can be connected to a drive motor. The drive motor is fixed on the bracket 110, and the drive motor can directly (or through a reducer) drive the second conveyor roller 124 to rotate, thereby driving the first annular belt 1211, the second annular belt 1212 and the first conveyor roller 123 to rotate synchronously through friction, so as to achieve stable delivery of packages. In other embodiments, the first conveyor roller 123 can also be set as a drive roller, or both the first conveyor roller 123 and the second conveyor roller 124 can be set as drive rollers to achieve synchronous driving of the two rollers and further improve the synchronicity of delivery. The cooperation of the first conveyor roller 123, the second conveyor roller 124, and the drive motor forms a stable synchronous conveying structure with the double-ring belts, ensuring that the first ring belt 1211 and the second ring belt 1212 rotate at the same speed. This prevents deviation and jamming during package conveying and ensures that the packages accurately pass through the inkjet area above the gap 122. The combination of the drive motor and the reducer allows for precise adjustment of the conveying speed, adapting to the conveying needs of packages of different sizes and weights, while also reducing vibration during conveying and minimizing inkjet marking misalignment caused by vibration. Both single-roller drive and dual-roller synchronous drive designs simplify the transmission mechanism, reduce equipment assembly difficulty and maintenance costs, and further improve the operational stability of the conveying assembly 120.

[0038] Reference Figures 1-4In some embodiments, the conveying assembly 120 further includes a third conveying roller 125 and a fourth conveying roller 126. The third conveying roller 125 is located within the first annular belt 1211 and the second annular belt 1212 and abuts against the first annular belt 1211 and the second annular belt 1212 respectively, and is located below the first conveying roller 123. The fourth conveying roller 126 is located within the first annular belt 1211 and the second annular belt 1212 and abuts against the first annular belt 1211 and the second annular belt 1212 respectively, and is located below the second conveying roller 124. Both the third conveying roller 125 and the fourth conveying roller 126 are rotatably connected to the bracket 110, and their axes are arranged parallel to each other in the transverse direction. The third conveying roller 125 is a front lower support roller, and the fourth conveying roller 126 is a rear lower support roller. Both are used to tension the first annular belt 1211 and the second annular belt 1212 to prevent the conveyor belt 121 from becoming loose or slipping during operation, and to ensure conveying stability.

[0039] The third conveyor roller 125 and the fourth conveyor roller 126 cooperate with the first annular belt 1211, the second annular belt 1212, the first conveyor roller 123, and the second conveyor roller 124. Two lower support rollers respectively support and tension the front and rear ends of the double annular belts, effectively preventing them from loosening or slipping due to tension during long-term operation. This ensures the conveying surface of the double annular belts remains flat, thereby maintaining a constant distance between the bottom of the package and the inkjet end of the marking assembly 130, improving the consistency of inkjet marking. Simultaneously, the lower support rollers distribute the stress on the double annular belts, reducing wear, extending their service life, and lowering equipment maintenance costs. Furthermore, the lower support rollers, in conjunction with the front and rear conveyor rollers, form a complete conveying support structure, further improving the stability of package conveying and preventing marking misalignment caused by conveying vibrations.

[0040] See Figures 6-7Viewed along the transverse axis, the first annular belt 1211 and the second annular belt 1212 together enclose a receiving space 127, within which the marking component 130 is disposed. In the basic structure, although the marking component 130 is located below the gap 122 of the conveyor surface 1210 of the conveyor belt 121, the integral conveyor belt suffers from difficulties in creating the gap, and the marking component 130 is exposed and susceptible to dust and debris contamination in the logistics environment, affecting its service life. Furthermore, the integral conveyor belt has poor flexibility in adjusting the gap width, making it difficult to adapt to different inkjet width requirements. To address these issues, this embodiment employs a technical solution of splitting the conveyor belt 121 into two spaced annular belts. The gap 122 is naturally formed with the interval between the two annular belts, requiring no additional processing, and the width of the gap 122 can be flexibly adapted to the inkjet width by adjusting the spacing between the two annular belts. Simultaneously, the receiving space 127 formed by the two annular belts completely encloses the marking component 130, providing protection, reducing dust and debris contamination, and extending the equipment's service life. Compared to a single conveyor belt, the dual-ring belt synchronous conveyor structure makes tension adjustment easier, reducing slippage and deviation, and improving conveying stability. The first ring belt 1211 and the second ring belt 1212 enclose a receiving space 127, within which the marking component 130 is housed. The receiving space 127 completely encloses the marking component 130, effectively isolating it from dust and debris in the logistics environment, preventing them from entering the marking component 130 and affecting inkjet accuracy and equipment lifespan, thus providing excellent protection. Simultaneously, the receiving space 127 fully utilizes the unused area between the two ring belts, eliminating the need for additional installation space for the marking component 130, further improving the structural compactness of the sorting machine 100 and reducing the equipment's footprint. Furthermore, the marking component 130's integration into the receiving space 127 prevents collisions with external components, reducing the risk of malfunctions during equipment operation and improving overall operational stability.

[0041] Reference Figures 1-4In some embodiments, to prevent the first annular belt 1211 and the second annular belt 1212 from deviating laterally during operation and to ensure a constant width of the gap 122, thereby guaranteeing the accuracy of inkjet marking, this embodiment optimizes the mating structure between the conveyor rollers and the annular belts. Both the first conveyor roller 123 and the second conveyor roller 124 are provided with a first annular groove 1231. The inner side of the first annular belt 1211 is provided with a first limiting protrusion 12111, which cooperates with the two first annular grooves 1231 to limit the axial position of the first annular belt 1211 along the transverse axis. And / or, both the first conveyor roller 123 and the second conveyor roller 124 are provided with a second annular groove 1243, and the inner side of the second annular belt 1212 is provided with a second limiting protrusion 12121, which cooperates with the two second annular grooves 1243 to limit the axial position of the second annular belt 1212 along the transverse axis. Specifically, both the first annular groove 1231 and the second annular groove 1243 are arranged in a closed loop around the circumference of the conveyor roller. The first limiting protrusion 12111 is arranged in a closed loop around the inner side of the first annular belt 1211, and the second limiting protrusion 12121 is arranged in a closed loop around the inner side of the second annular belt 1212. The limiting protrusions are embedded in the corresponding annular grooves. During the operation of the conveyor belt 121, the annular grooves laterally limit the limiting protrusions, preventing the annular belt from shifting or deviating axially. This ensures that the width of the gap 122 between the first annular belt 1211 and the second annular belt 1212 remains constant, preventing problems such as incomplete inkjet marking or missed printing due to gap deviation, and improving marking stability.

[0042] The first annular groove 1231, the second annular groove 1243, the first limiting protrusion 12111, and the second limiting protrusion 12121 cooperate with the first annular belt 1211, the second annular belt 1212, the first conveyor roller 123, and the second conveyor roller 124, respectively. Through the embedded cooperation between the limiting protrusion and the annular groove, the lateral position of the double annular belt can be precisely limited, effectively preventing the double annular belt from shifting or deviating along the axial direction during high-speed operation, ensuring that the width of the gap 122 remains constant, and thus ensuring that the inkjet range of the marking component 130 always covers the bottom of the package, preventing problems such as missed printing and incomplete marking.

[0043] Reference Figures 1-4In some embodiments, the marking component 130 includes a sensing module 131, an inkjet module 132, and a photocuring module 133, which are arranged sequentially along the conveying direction of the conveying component 120. That is, along the conveying direction of the package from the first position 1291 to the second position 1292, the sequence is sensing module 131, inkjet module 132, and photocuring module 133, with the sensing end, inkjet end, and light-emitting end of each module facing upwards and directly opposite the gap 122. In the applicant's initial solution, either there was no sensing device, resulting in inaccurate inkjet timing for a very small number of packages, leading to missed or incorrect markings; or there was no curing device, resulting in the ink not curing in time after inkjet printing, making it easy for a very small number of packages to be scratched or detached during subsequent conveying and sorting, affecting the integrity of the marking. To address these issues, this embodiment employs a technical solution that combines a sensing module 131, a photocuring module 133, and a dual-color printhead with color recognition. The sensing module 131 senses the package above it, the inkjet module 132 marks the package with inkjet ink based on the sensing result from the sensing module 131, and the photocuring module 133 cures the inkjet-marked ink. This solution uses the sensing module 131 to accurately capture the arrival time of the package, avoiding missed or incorrect markings. The photocuring module 133 enables instantaneous ink curing, ensuring the durability of the markings.

[0044] The sensing module 131, inkjet module 132, and photocuring module 133 are sequentially arranged along the conveying direction of the conveying assembly 120, enabling a continuous operation of "package sensing - precise inkjet printing - ink curing". The sensing module 131 accurately detects the arrival time of the package, providing an accurate inkjet trigger signal to the inkjet module 132, avoiding missed or incorrect printing and improving the accuracy of the marking position. After the inkjet module 132 completes the marking, the photocuring module 133 immediately cures the ink, preventing the ink from being smudged or peeled off during subsequent conveying and sorting, ensuring the integrity and durability of the marking. All three are positioned directly opposite the gap 122, cooperating with the gap 122 formed by the first annular belt 1211 and the second annular belt 1212, ensuring that the sensing, inkjet printing, and curing actions can all accurately act on the bottom of the package, further improving the marking quality. At the same time, the continuous operation process requires no manual intervention, improving the efficiency of package marking and adapting to the high-frequency operation requirements of logistics scenarios.

[0045] Specifically, the sensing module 131 can be a photoelectric sensing module. In this embodiment, the sensing module 131 may include a through-beam photoelectric sensor. The transmitting end and receiving end of the photoelectric sensor are respectively located on the lateral sides of the gap 122. When the package passes over the sensing module 131, the through-beam light path is blocked, and the sensing module 131 generates a trigger signal and sends it to the inkjet module 132. In other embodiments, the sensing module 131 may also be a diffuse reflection photoelectric sensor, which is directly installed below the gap 122 to identify the position of the package by the reflected light signal. Alternatively, an infrared sensing sensor may be used to identify the position of the package by whether or not the infrared signal is reflected.

[0046] When the sensing module 131 uses a through-beam photoelectric sensor, the transmitter and receiver of the through-beam photoelectric sensor are respectively located on both sides of the gap 122 formed by the first and second annular belts. The light path passes through the gap 122. When a package passes through, it can quickly block the light path, resulting in a fast trigger signal response speed and improving the accuracy and timeliness of package arrival recognition. At the same time, the gap 122 provides an unobstructed transmission channel for the light path, preventing the conveyor belt 121 or other components from blocking the light path, ensuring the recognition stability of the sensing module 131, reducing false triggering or missed triggering, and thus ensuring the accurate inkjet timing of the inkjet module 132 and improving the reliability of marking.

[0047] Reference Figures 1-5 In some embodiments, the sorting machine 100 may also integrate a speed sensor 1312, which is used to monitor the running speed of the conveyor belt 121 in real time. The controller 140 can calculate the inkjet delay time based on the running speed of the conveyor belt 121 and the conveying distance between the sensing module 131 and the inkjet module 132. When the sensing module 131 senses that the package has arrived, the controller 140 delays the previously calculated inkjet delay time and controls the inkjet module 132 to start inkjet printing, ensuring that the printing area of ​​the package is precisely aligned with the inkjet module 132 to complete the inkjet printing, thereby improving the accuracy of the marking position and avoiding marking misalignment or missed printing. By accurately calculating the inkjet delay time through the controller 140, precise linkage between "sensing-delay-inkjet" is achieved, ensuring that the preset printing area of ​​the package is precisely aligned with the inkjet module 132 to complete the inkjet printing, effectively avoiding marking misalignment or missed printing caused by changes in conveyor belt speed or package position offset, and further improving the accuracy of the marking position. Meanwhile, this matching structure eliminates the need for manual adjustment of the delay time, adapts to changes in conveyor belt speed, and enhances the automation and adaptability of the equipment.

[0048] Reference Figures 1-5In some embodiments, the inkjet module 132 may include a first printhead 1321 and a second printhead 1322. The ink ejected by the first printhead 1321 is of a different color than the ink ejected by the second printhead 1322. The sensing module 131 can sense the color of the outer packaging of the package, and the inkjet module 132 selects the printhead with the ink color different from that of the outer packaging to mark the package. In this embodiment, the controller 140 controls the printhead with the dark ink to ensure that the inkjet mark forms a strong contrast with the background color of the package, improving the recognition and readability of the mark, and completely solving the problem of the mark being unrecognizable due to the similarity between the color of the outer packaging and the ink color. The dual-color printhead setting eliminates the need for manual replacement of ink or printheads, and can adapt to different colored outer packaging, improving the adaptability of the equipment and the marking efficiency. At the same time, this cooperative structure, in conjunction with the sensing module 131 and the inkjet module 132, realizes the automated operation of "color recognition - printhead switching - precise inkjet", further improving the standardization and reliability of the marking.

[0049] Specifically, the UV curing module 133 may include at least one set of UV curing lamps, or a combination of UV curing lamps and a reflector. The light-emitting surface of the UV curing lamp is positioned directly opposite the gap 122. When a package marked with inkjet ink passes over the UV curing module 133, the ultraviolet light emitted by the UV curing lamp shines through the gap 122 onto the ink marking on the bottom of the package, causing the ink to cure instantly. This prevents the ink from being scratched or detached during subsequent conveying and sorting processes, ensuring the integrity and durability of the marking. The UV curing lamp, reflector, and the gap 122 formed by the first annular belt 1211 and the second annular belt 1212 work together. The light-emitting surface of the UV curing lamp faces the gap 122, allowing ultraviolet light to accurately pass through the gap 122 and illuminate the ink markings on the bottom of the package, achieving instant ink curing, preventing ink smudging and peeling, and ensuring the integrity and durability of the markings. The reflector reflects and concentrates the ultraviolet light emitted by the UV curing lamp, improving the utilization rate of ultraviolet light, shortening the curing time, improving work efficiency, and reducing ultraviolet light leakage, thus reducing the impact on the surrounding environment and operators. This structure, together with the inkjet module 132 and the gap 122, forms a closed loop of "inkjet-curing", further improving marking quality and work continuity.

[0050] In some embodiments, refer to Figure 9The first annular belt 1211 includes a first conveyor wall 12112 located at the upper end for conveying packages, and the second annular belt 1212 includes a second conveyor wall 12122 located at the upper end for conveying packages. The first conveyor wall 12112 and the second conveyor wall 12122 are arranged opposite each other with a lateral spacing. The first conveyor wall 12112 is inclined in a direction toward the second conveyor wall 12122, and the second conveyor wall 12122 is inclined in a direction toward the first conveyor wall 12112, so that the distance between the first conveyor wall 12112 and the second conveyor wall 12122 gradually increases from bottom to top. Specifically, the roller segments on the first conveyor roller 123, the second conveyor roller 124, the third conveyor roller 125, and the fourth conveyor roller 126 that cooperate with the first annular belt 1211 and the roller segments that cooperate with the second annular belt 1212 can all be configured with a suitable conical structure. This allows the upper first conveying wall 12112 of the first annular belt 1211 and the upper second conveying wall 12122 of the second annular belt 1212 to form a small V-shaped angle. The angle can range from 1° to 5°, and the angle can be adjusted according to the package size or weight to improve the centering effect. Of course, in other embodiments, the first conveying wall 12112 and the second conveying wall 12122 can also be arranged on the same horizontal plane.

[0051] In related technologies, when the conveyor walls of the two annular belts are horizontal, small packages, due to their small size and light weight, are easily affected by vibration and conveying inertia during transport, resulting in lateral deviation. This causes the packages to fail to pass completely through the inkjet area above the gap, leading to missed printing. Initially, the applicant added elastic guide bars for guidance, but these bars generate reverse friction with the packages, affecting transport efficiency, and are also easily damaged, increasing maintenance costs. To address these issues, this embodiment adopts a technical solution where the conveyor walls of the two annular belts are set as an inclined V-shaped structure. Specifically, the first conveyor wall 12112 and the second conveyor wall 12122 are inclined to form a V-shaped structure. This V-shaped structure works in conjunction with the first annular belt 1211, the second annular belt 1212, and the conical structure. The V-shaped structure utilizes the lateral component of gravity and the transport force to automatically move the packages towards the central gap 122 area. Regardless of the initial offset of the small package, it can automatically center itself during transport, ensuring that the package passes completely through the inkjet area, fundamentally avoiding the missed printing problem. The conical structure, combined with the inclined conveyor wall, precisely supports the double-ring belts, ensuring a stable V-shaped angle and preventing deformation of the ring belts that could reduce the centering effect. Specifically, in this design, the first conveyor roller 123 can be a roller that is thicker at both ends and thinner in the middle. This allows the first ring belt 1211 and the second conveyor belt 1212 to naturally form a V-shaped structure after being fitted onto the first conveyor roller 123, enabling both belts to be driven simultaneously by a single roller, without the need for two rollers arranged at an angle.

[0052] With this V-shaped structure, packages on conveyor belt 121 will automatically move towards the middle area of ​​the two circular belts under the combined action of gravity and the lateral component of the transmission force of conveyor belt 121. Regardless of the initial offset position of small packages, they can automatically center themselves during the conveying process, ensuring that the packages can pass completely through the inkjet area above the gap 122. This fundamentally avoids the problem of missed printing caused by misalignment of small packages and prevents subsequent package marking misalignment and systemic errors caused by the missed printing of a single package. At the same time, compared with the solution of adding elastic baffles for centering in related technologies, this solution does not require additional components, does not generate reverse friction force on the packages, does not affect the package conveying efficiency, and has no additional vulnerable parts, resulting in higher equipment operational stability.

[0053] In some embodiments, the conveying assembly 120 further includes a third annular belt 1213, which is located between the first annular belt 1211 and the second annular belt 1212, and is located at the front end of the marking assembly 130. Here, "front end" refers to the side closer to the first position 1291 along the package conveying direction; that is, the third annular belt 1213 is located upstream of the inkjet module 132, and the package first passes through the third annular belt 1213 for correction and adjustment before entering the inkjet marking area.

[0054] This embodiment provides two parallel implementation solutions for the third annular belt 1213. (Refer to...) Figure 10 In the first scheme, the third annular belt 1213 rotates synchronously with the first annular belt 1211 and the second annular belt 1212 to transport packages. Specifically, the third annular belt 1213 is also fitted onto the first conveyor roller 123 and is synchronously driven by the drive roller, rotating at the same speed as the first annular belt 1211 and the second annular belt 1212. The upper surface of the third annular belt 1213 is at the same level as the conveying surface 1210 of the first annular belt 1211 and the second annular belt 1212, which is used to fill the front gap between the first annular belt 1211 and the second annular belt 1212, preventing the packages from slipping or getting stuck during transport due to friction between the gap and the table surface. This is especially beneficial for soft packaging and ultra-thin packages, effectively improving the smoothness of transport, while eliminating the need for additional independent drive components and simplifying the equipment structure. Because the third annular belt 1213 rotates synchronously with the first annular belt 1211 and the second annular belt 1212, the third annular belt 1213 can fill the front gap between the first annular belt 1211 and the second annular belt 1212, preventing soft and ultra-thin packages from getting stuck in the gap or slipping and getting stuck due to friction with the edge of the gap, thus improving the smoothness of package conveying. The synchronous rotation of the third annular belt 1213 with the double annular belts also ensures that the package conveying speed is consistent, avoiding package deviation due to speed differences, and further ensuring the centering effect of the package. In addition, the third annular belt 1213 in this solution is driven by the first conveyor roller 123, so there is no need to add an additional independent drive component, simplifying the equipment structure, reducing manufacturing and maintenance costs, and improving the integration of the conveying components.

[0055] Reference Figure 10In the second embodiment, the sorting machine 100 further includes a position detection component 150. When the position detection component 150 detects that a package is off-center, the third annular belt 1213 is driven to rotate in the opposite direction to the first annular belt 1211 and the second annular belt 1212, so that the third annular belt 1213 and one of the first annular belt 1211 or the second annular belt 1212 jointly drive the package to rotate. When the package rotates to a position close to the center, the third annular belt 1213 is driven to rotate synchronously with the first annular belt 1211 and the second annular belt 1212. Specifically, the third annular belt 1213 can be driven by an independent fifth conveyor roller and an independent drive motor, enabling independent control of forward rotation, reverse rotation, and stop. The position detection component 150 can include multiple sets of photoelectric sensors arranged laterally, or it can include a visual recognition sensor, located above or below the third annular belt 1213, for real-time detection of the lateral position of the package on the conveyor belt 121. When the position detection component 150 detects that the package has deviated from the center position to the left, the controller 140 controls the third annular belt 1213 to rotate in the opposite direction. At this time, the first annular belt 1211 on the left conveys forward and the third annular belt 1213 in the middle conveys in the opposite direction. The resulting frictional torque causes the package to deflect to the right until the position detection component 150 detects that the package is centered. Then, the controller 140 controls the third annular belt 1213 to switch to forward synchronous rotation and continue to transport the package. Similarly, when the package deviates from the center position to the right, the reverse rotation causes the package to deflect to the left and center.

[0056] The third annular belt 1213 adopts an independent drive mode. The position detection component 150, controller 140, and the third annular belt 1213 cooperate with the first annular belt 1211 and the second annular belt 1212. The position detection component 150 detects the package position in real time, and the controller 140 controls the forward and reverse rotation of the third annular belt 1213 based on the detection results. The frictional torque between the third annular belt 1213 and the two annular belts drives the package to deflect and center, achieving dynamic and precise correction of the package. This is suitable for packages with heavy weight and irregular shape, solving the problem of packages being difficult to center accurately. The independent drive design of the third annular belt 1213 allows for flexible adjustment of the rotation direction and speed, high correction accuracy, and fast response speed, ensuring that the package printing area is accurately centered and improving the regularity of the marking. This cooperative structure can be used with a V-shaped structure to form a dual guarantee of "passive centering + active correction", further avoiding problems such as missed printing and marking misalignment, and improving the adaptability and marking reliability of the equipment.

[0057] The V-shaped centering solution is suitable for most small packages, but for heavier or irregularly shaped packages, relying solely on gravity and lateral force is insufficient for precise centering, and some packages may still be misaligned. Furthermore, in some scenarios, the printed position on the package needs to be precisely centered to improve marking regularity and facilitate subsequent identification. To address these issues, this embodiment employs a technical solution that adds an independently controllable third annular belt 1213 in conjunction with the position detection component 150 to achieve dynamic and precise package correction. This solution not only adapts to heavier and irregularly shaped packages but also ensures the printed position remains centered, improving marking regularity. Two parallel solutions can be selected based on the actual scenario, offering greater adaptability and further resolving the issue of misaligned or missed printing for different types of packages, thus improving sorting and delivery efficiency. This solution enables dynamic and precise centering and correction of packages, preventing the printing of small packages from being missed and ensuring the printed position remains centered, resulting in more regular inkjet markings that are easier for couriers and scanning devices to quickly identify, thereby improving sorting and delivery efficiency.

[0058] In some embodiments, the sorting machine 100 is used for last-mile parcel delivery, where last-mile delivery refers to the "last mile" delivery link from the courier outlet to the recipient's address. The sorting machine 100 also includes a signal receiving module 160 and a processing module 170. The signal receiving module 160 is used to receive the address information of each parcel sequentially transmitted by the conveying component 120, and the signal receiving module 160 is also used to receive numbering rules. The processing module 170 outputs a number according to the address information and the numbering rules, and the marking component 130 marks the parcel with inkjet ink according to the number.

[0059] Specifically, the signal receiving module 160 can communicate with the logistics system of the express delivery network, the handheld terminal of the courier, and the warehouse management system to obtain the recipient address information of the packages to be delivered in real time. It also receives preset numbering rules from the courier or the network. These numbering rules can be customized according to delivery needs, such as sorting by building number, by delivery route sequence, by unit number, by the last digit of the recipient's mobile phone number, or by the recipient's surname in pinyin or by package size, adapting to different courier delivery habits. The processing module 170 can be an MCU or PLC controller, or an embedded processor. Based on the received address information, it sorts the packages according to the preset numbering rules and generates corresponding delivery numbers. In one numbering system, the numbers can start with 100, which includes 110, 120, 130, etc.; 110 includes 111, 112, 113, etc.; and 111 includes 1111, 1112, 1113, etc. For example, consecutive numbers 100, 110, 120, etc., can be generated according to the delivery route. The numbering information is then sent to a marking component 130, which inkjet-marks the corresponding number on the bottom of the package. In another numbering system, the first digit can be a letter representing the community, the second digit a number representing the building, the third digit a number representing the floor, and the fourth digit a number representing the room number. For example, G-13-8-2 could represent the second room on the 8th floor of building 13 in a community whose name begins with the letter G. The numbering rules can be set according to the personal habits of the courier or the courier station. Since the operating rules of different couriers, different delivery areas or different delivery stations are different, the sorting machine 100 in this embodiment can actively receive the numbering rules and thus number the items according to the different numbering rules.

[0060] In related technologies, during last-mile delivery scenarios, couriers typically need to manually write delivery marks on packages, which is extremely inefficient. Furthermore, handwritten marks are often inconsistent and easily confused, requiring repeated checks of the address information on package labels, increasing workload and reducing efficiency. Additionally, different couriers have different marking habits, making unified management difficult. To address these issues, this embodiment employs a technical solution that adds a signal receiving module 160 and a processing module 170. This combines package address information with custom numbering rules to achieve automatic inkjet marking of delivery numbers, replacing traditional handwritten marks. This solution improves marking efficiency and standardization. Couriers only need to check the number to quickly sort packages, significantly reducing workload and increasing delivery efficiency. It also adapts to the habits of different couriers, enhancing scenario adaptability.

[0061] The signal receiving module 160, processing module 170, marking component 130, and conveying component 120 work together. The signal receiving module 160 acquires package address information and custom numbering rules in real time, the processing module 170 automatically generates and sorts the numbers, and the marking component 130 simultaneously performs inkjet marking, achieving automated operation of "address acquisition - number generation - automatic marking," replacing traditional handwritten marks and significantly improving marking efficiency and standardization. The numbering rules are customizable to adapt to the delivery needs of different couriers and different network points, enhancing scenario adaptability. When delivering packages, couriers only need to check the number on the bottom of the package for quick sorting, without repeatedly checking the address, reducing workload and improving last-mile delivery efficiency. At the same time, the unified marking facilitates unified management of packages at courier network points, reducing delivery errors.

[0062] In last-mile delivery scenarios, couriers typically handwrite marks on packages using pens based on their own habits, which is extremely inefficient and prone to errors and confusion. This solution, however, utilizes a sorting machine (100) to automatically mark last-mile packages. It adapts to personalized numbering rules for different couriers and delivery points, automatically matching package address information with the numbering rules to achieve automatic inkjet marking of delivery numbers. When delivering packages, couriers no longer need to repeatedly check the small print address information on the package labels; they can quickly find the corresponding delivery item from hundreds of packages in their delivery van simply by following the numbering sequence at the bottom of the package. This significantly improves last-mile delivery efficiency and reduces the workload of couriers.

[0063] In some embodiments, refer to Figure 11 This embodiment provides a sorting system 200, which includes any of the sorting machines 100 described above, as well as a distribution mechanism 210 and a receiving mechanism 220. The distribution mechanism 210 is used to convey packages to the sorting machine 100. The distribution mechanism 210 can be a feeding conveyor belt, a robotic arm feeding mechanism, a barcode scanning feeding mechanism, etc., or it can be a manual feeding platform with conveyor rollers. It is located at the front end of the first position 1291 of the sorting machine 100 and is used to orderly and one by one send the packages to be sorted and marked into the conveying component 120 of the sorting machine 100. The storage mechanism 220 is used to classify and store the packages marked with inkjet ink. The storage mechanism 220 can be a multi-compartment sorting compartment, multiple sets of storage conveyor belts, a sorting wheel mechanism, etc., or it can be a classification and storage basket with a pushing mechanism. It is located at the rear end of the second position 1292 of the sorting machine 100. It can classify and store packages of different types, different delivery routes, and different addresses into the corresponding compartments according to the inkjet marking information of the packages, so as to realize the fully automatic marking and sorting of packages.

[0064] The sorting machine 100, distribution mechanism 210, and storage mechanism 220 work together. The distribution mechanism 210 ensures orderly loading of packages, avoiding congestion and misalignment of labels caused by package accumulation, thus improving loading efficiency. The sorting machine 100 accurately marks the packages, solving the problems of poor marking effect, high cost, and poor stability in related technologies. The storage mechanism 220 automatically sorts and stores packages based on the marking information, replacing manual sorting, significantly improving sorting efficiency and reducing sorting errors. The three work together to form a fully automated operation of "loading-marking-sorting-storage," requiring no human intervention. This is suitable for the high-frequency, high-efficiency operation needs of logistics sorting and last-mile delivery scenarios, while reducing labor costs and improving operational standardization and uniformity.

[0065] The following provides a sorting machine 100 in a complete embodiment. The sorting system 200 includes a support 110, a double-ring belt conveyor assembly 120 (the double-ring belt conveyor assembly 120 includes a first ring belt 1211, a second ring belt 1212, a first conveyor roller 123, a second conveyor roller 124, a third conveyor roller 125, a fourth conveyor roller 126, a first limiting protrusion 12111, a second limiting protrusion 12121, a first annular groove 1231, and a second annular groove 1243, wherein the first limiting protrusion 12111 engages with the first annular groove 1231, and the second limiting protrusion 12121 engages with...), The system includes a second annular groove 1243, a V-shaped conveyor wall, a marking component 130 (which includes a through-beam photoelectric sensor module 131, a speed sensor 1312, a color recognition sensor, a first nozzle 1321, a second nozzle 1322, a UV curing lamp 1331, and a reflector 1332), a signal receiving module 160, a processing module 170, a controller 140, a feeding conveyor belt type distribution mechanism 210, and a multi-compartment storage mechanism 220. It is adapted to last-mile delivery scenarios in express delivery, and its complete working process is as follows: 1. Equipment Start-up and Parameter Preset: After the sorting system 200 is started, the drive motor drives the second conveyor roller 124 to rotate, which in turn drives the first annular belt 1211 and the second annular belt 1212 to run synchronously and uniformly. The first to fourth conveyor rollers 123, 124, 125, and 126 cooperate to tension the conveyor belt 121 to ensure smooth conveying. The preset gap 122 width is 100mm, the distance between the inkjet end of the marking component 130 and the conveyor surface 1210 is preset to 10mm (the optimal printing distance for inkjet ink), the included angle of the V-shaped conveyor wall is set to 3°, and the preset numbering rule is "numbered in the order of delivery route (starting from 100, 100 includes 110, 120, etc., 110 includes 111, 112, etc.)". The signal receiving module 160 establishes communication with the express delivery network logistics system to obtain the address information and corresponding delivery route of the package to be delivered.

[0066] 2. Package loading and conveying: The distribution mechanism 210 (loading conveyor belt) orderly and sequentially feeds the packages to be marked and sorted into the first position 1291 (loading position) of the sorting machine 100. The packages fall on the V-shaped conveyor wall of the first annular belt 1211 and the second annular belt 1212. Under the combined action of gravity and the lateral component of the transmission force of the conveyor belt 121, regardless of whether the initial placement position of the package is offset, it will automatically move towards the center of the middle gap 122 area and then be conveyed at a uniform speed to the second position 1292 (unloading position) with the conveyor belt 121. During the conveying process, the first limiting protrusion 12111 of the first annular belt 1211 is embedded in the first annular groove 1231 of the first conveyor roller 123 and the second conveyor roller 124, and the second limiting protrusion 12121 of the second annular belt 1212 is embedded in the corresponding second annular groove 1243, to prevent the conveyor belt 121 from running laterally and to ensure that the width of the gap 122 is constant.

[0067] 3. Package Sensing and Parameter Detection: When a package passes over the sensing module 131, the light path of the through-beam photoelectric sensor 1311 is blocked. The sensing module 131 immediately generates a package arrival trigger signal. At the same time, the integrated speed sensor 1312 collects the real-time running speed of the conveyor belt 121 (assumed to be 0.5m / s), and the color recognition sensor 1313 identifies the background color of the outer packaging at the bottom of the package (assumed to be a light color). The sensing module 131 sends the trigger signal, the speed data of the conveyor belt 121, and the background color information to the processing module 170. The processing module 170 calculates the inkjet delay time as 0.2s based on the transmission distance between the sensing module 131 and the inkjet module 132 (assumed to be 0.1m). At the same time, according to the preset numbering rules and the delivery route corresponding to the package address information, the processing module 170 generates a delivery number for the package (assumed to be "100").

[0068] 4. Precise Inkjet Marking: After a 0.2s delay, the processing module 170 sends an inkjet command to the inkjet module 132. Since the background color of the package is light, the controller 140 controls the first printhead 1321 (black ink printhead) to start, and precisely sprays ink onto the bottom of the package through the gap 122 to print the number "100". If the background color of the package is dark, the controller 140 controls the second printhead 1322 (white ink printhead) to work, ensuring that the mark forms a strong contrast with the background color and improving the recognizability.

[0069] 5. Ink UV curing: The package marked with inkjet continues to be conveyed forward with the conveyor belt 121. When it passes above the UV curing module 133, the UV curing lamp 1331 is activated, emitting ultraviolet light that shines through the gap 122 onto the ink mark on the bottom of the package, causing the ink to cure instantly. This prevents the mark from being scratched or falling off during subsequent conveying and sorting, ensuring the integrity and durability of the mark.

[0070] 6. Sorting and Subsequent Transfer: Packages with solidified markings are transported to the second location 1292 (unloading position). The sorting mechanism 220 (multi-compartment sorting compartment) identifies the corresponding delivery route based on the number "100" on the bottom of the package, controls the opening of the corresponding compartment's baffle, and sends the package into the corresponding compartment for sorting and storage. Subsequently, couriers can quickly sort packages for the corresponding delivery route based on the corresponding number of the compartment, without having to repeatedly check the package address, thus improving last-mile delivery efficiency.

[0071] The entire process requires no manual intervention, achieving fully automated operation of packages from automatic feeding, centering and correction, precise sensing, matching background color inkjet printing, ink curing, to sorting and storage. It not only solves many defects of existing marking methods, but also improves sorting and delivery efficiency, and meets the actual needs of last-mile delivery of express delivery.

[0072] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A sorting machine, characterized in that, include: support; A conveying assembly, connected to the support, includes a conveyor belt adapted to convey a package to be marked from a first position to a second position, the conveyor belt having a gap between the first position and the second position; A marking assembly, connected to the support, is disposed below the conveyor surface of the conveyor belt, and is adapted to inkjet mark the bottom of the package passing above it through the gap.

2. The sorting machine as described in claim 1, characterized in that, The conveyor belt includes a first annular belt and a second annular belt. Both the first annular belt and the second annular belt are arranged around a transverse axis, and the first annular belt and the second annular belt are spaced apart in the transverse direction. The gap is located between the first annular belt and the second annular belt.

3. The sorting machine as described in claim 2, characterized in that, The conveying assembly further includes a first conveying roller and a second conveying roller; The first conveyor roller is located within the first annular belt and the second annular belt and abuts against the sides of the first annular belt and the second annular belt near the first position, respectively; the second conveyor roller is located within the first annular belt and the second annular belt and abuts against the sides of the first annular belt and the second annular belt near the second position, respectively. At least one of the first conveyor roller and the second conveyor roller is a drive roller for driving the first annular belt and the second annular belt to rotate.

4. The sorting machine as described in claim 3, characterized in that, The conveying assembly further includes a third conveying roller and a fourth conveying roller; The third conveyor roller is located within the first annular belt and the second annular belt and abuts against the first annular belt and the second annular belt respectively, and the third conveyor roller is located below the first conveyor roller; the fourth conveyor roller is located within the first annular belt and the second annular belt and abuts against the first annular belt and the second annular belt respectively, and the fourth conveyor roller is located below the second conveyor roller; Viewed along the transverse axis, the first annular band and the second annular band together enclose a receiving space, and the marking component is disposed within the receiving space.

5. The sorting machine as described in claim 3, characterized in that, Both the first conveyor roller and the second conveyor roller are provided with a first annular groove. The inner side of the first annular belt is provided with a first limiting protrusion. The first limiting protrusion cooperates with the two first annular grooves to limit the axial position of the first annular belt along the transverse axis. And / or, Both the first conveyor roller and the second conveyor roller are provided with a second annular groove. The inner side of the second annular belt is provided with a second limiting protrusion. The second limiting protrusion cooperates with the two second annular grooves to limit the axial position of the second annular belt along the transverse axis.

6. The sorting machine as described in claim 2, characterized in that, The marking component includes a sensing module, an inkjet module, and a photocuring module, which are arranged sequentially along the conveying direction of the conveying component. The sensing module is used to sense the package above it, the inkjet module is used to mark the package above it with inkjet based on the sensing result of the sensing module, and the photocuring module is used to perform photocuring treatment on the inkjet marking ink. The inkjet module includes a first printhead and a second printhead. The ink ejected by the first printhead is of a different color than the ink ejected by the second printhead. The sensing module can sense the color of the outer packaging of the package. The inkjet module selects a printhead with an ink color different from that of the outer packaging to mark the package with inkjet ink.

7. The sorting machine as described in claim 6, characterized in that, The first annular belt includes a first conveyor wall at its upper end for conveying the package, and the second annular belt includes a second conveyor wall at its upper end for conveying the package. The first conveyor wall and the second conveyor wall are arranged opposite each other at a lateral interval. The first conveying wall is inclined toward the second conveying wall, and the second conveying wall is inclined toward the first conveying wall, so that the distance between the first conveying wall and the second conveying wall gradually increases from bottom to top.

8. The sorting machine as described in claim 6, characterized in that, The conveying assembly further includes a third annular belt located between the first annular belt and the second annular belt, and the third annular belt is located at the front end of the marking assembly; The third annular belt rotates synchronously with the first and second annular belts to transport the package; or, the sorting machine further includes a position detection component, which, when the position detection component detects that the package is off-center, drives the third annular belt to rotate in the opposite direction to the first and second annular belts, so that the third annular belt, together with one of the first or second annular belts, drives the package to rotate; when the package rotates to a position close to the center, the third annular belt is driven to rotate synchronously with the first and second annular belts.

9. The sorting machine as described in claim 1, characterized in that, The sorting machine is used for last-mile parcel delivery. The sorting machine also includes a signal receiving module and a processing module. The signal receiving module is used to receive the address information of each parcel that is sequentially transmitted by the conveying component. The signal receiving module is also used to receive numbering rules. The processing module outputs a number according to the address information and the numbering rules. The marking component marks the parcel with inkjet ink according to the number.

10. A sorting system, characterized in that, include: The sorting machine according to any one of claims 1-9, and, A distribution mechanism for conveying the packages to the sorting machine. A storage mechanism for sorting and storing the packages marked with inkjet printing.

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