Intelligent mechanical sorting and stacking integrated system for subsequent process of cigarette packet printing
By designing an integrated system for intelligent mechanical sorting and palletizing, the problem of insufficient automation of sorting and palletizing in the later process of the tobacco bag printing industry is solved, and efficient and accurate sorting and palletizing are achieved to meet the rapid switching needs of multi-special products.
Patent Information
- Application Number
- CN202510629764.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2025-06-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The sorting and palletizing of the latter process in the tobacco bag printing industry has problems such as low detection efficiency, high missed detection rate, high labor intensity and insufficient automation, making it difficult to adapt to the rapid switching needs of multi-special products.
Design an intelligent mechanical sorting and palletizing integrated system, including an intelligent sorting unit and an automatic palletizing unit. The intelligent sorting unit uses a photo detector combined with a sorting cylinder and a sorting push plate to automatically remove defective products, and the packing robot is equipped with a suction cup to automatically grab and pack the cigarette bag. The automatic palletizing unit realizes unmanned palletizing through a cycle lifting belt and a palletizing guide mechanism.
It improves sorting accuracy and palletizing efficiency, reduces labor costs, adapts to the efficient production needs of diverse products, and achieves a high level of automation in the post-process of cigarette pack printing.
Smart Images

Figure CN120205493A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of cigarette pack printing, and particularly to an intelligent mechanical sorting and palletizing integrated system for the post - process of cigarette pack printing. Background Art
[0002] In the cigarette pack printing industry, the sorting and palletizing of the post - process are key links affecting production efficiency and product quality. In traditional processes, the appearance inspection and sorting of cigarette packs mainly rely on manual visual judgment, which has problems such as low inspection efficiency, high missed - inspection rate, and high labor intensity. In the packing and palletizing links, manual handling and stacking are required, with insufficient automation, which easily leads to cigarette pack collision damage or uneven palletizing, and it is difficult to meet the rapid switching requirements of multi - specification products.
[0003] Existing mechanical sorting equipment usually adopts fixed - station detection, with poor flexibility, unable to dynamically adjust the detection distance and sorting force; the palletizing process mostly relies on direct pushing by a conveyor belt, lacking precise control of the box posture, prone to tipping or stacking misalignment, increasing the difficulty of subsequent logistics transportation. In addition, the sorting and palletizing links in traditional systems are independent of each other and require manual transfer, resulting in process fragmentation and making it difficult to achieve fully automated production.
[0004] Therefore, there is an urgent need to develop a system integrating intelligent detection, automatic sorting, and precise palletizing functions to improve the automation level of the post - process of cigarette pack printing, reduce labor costs, and meet the high - efficiency production requirements of diversified products. Through the collaborative design of the intelligent sorting unit and the automatic palletizing unit, the present invention effectively solves the above - mentioned technical problems and has significant innovation and practical value. Summary of the Invention
[0005] In order to solve the problems mentioned in the above background art, the present invention provides an intelligent mechanical sorting and palletizing integrated system for the post - process of cigarette pack printing.
[0006] To achieve the above object, the present invention adopts the following technical solutions: An intelligent mechanical sorting and palletizing integrated system for the post - process of cigarette pack printing includes an intelligent sorting unit and an automatic palletizing unit. The intelligent sorting unit includes a sorting conveyor belt and a packing manipulator. One end of the sorting conveyor belt is provided with a detection platform. One side of the detection platform is equipped with a sorting cylinder. The output shaft of the sorting cylinder is fixed with a sorting push plate. A good - product storage box and a defective - product storage box are placed beside the detection platform. A photographing detector is provided directly above the detection platform; The automatic palletizing unit includes a circulating lifting belt. A plurality of good - product storage box brackets are equidistantly distributed on the circulating lifting belt. One side of the circulating lifting belt is provided with a vertically arranged support guiding rod. The top of the support guiding rod is fixed with an installation platform. A palletizing guiding mechanism is provided below the installation platform, and a lifting tray is provided below the palletizing guiding mechanism.
[0007] Preferably, a suction cup is installed on the packing robot arm, and the defective product storage box is located on the side of the detection platform away from the sorting cylinder.
[0008] Preferably, a pair of first limit baffles are arranged in parallel at the top of the sorting conveyor belt. The first limit baffles are movably installed through sliding rods, and the positions of the sliding rods are fixed by bolts.
[0009] Preferably, the good product storage box bracket includes two connecting rods arranged in parallel. The connecting rods are perpendicular to the circulating lifting belt, and a support rotating shaft is rotatably installed between the ends of the connecting rods away from the circulating lifting belt. A connecting frame is fixed on the support rotating shaft, and two horizontally arranged strip-shaped brackets are fixed at one end of the connecting frame away from the support rotating shaft.
[0010] Preferably, a limiting member is fixed at the top of the strip-shaped bracket. The limiting member is fixed in an oval hole on the strip-shaped bracket by a bolt, and a pair of limiting members are arranged on each strip-shaped bracket.
[0011] Preferably, a reversing gear is fixed at one end of the support rotating shaft. Semi-circular racks are arranged at the top and bottom of the installation bracket of the circulating lifting belt. The diameter of the semi-circular rack is the same as that of the reversing gear.
[0012] Preferably, a driving box is fixed at the top of the installation platform. A threaded rod is rotatably installed at the bottom of the installation platform. The threaded rod is driven to rotate by the driving box. A lifting push plate is slidably installed outside the support guide rod through a guide sleeve.
[0013] Preferably, a threaded sleeve is installed on the lifting push plate. The threaded sleeve is threadedly installed outside the threaded rod. Positioning sleeves are fixed at the four corners of the bottom of the lifting tray, and positioning pins corresponding to the positioning sleeves are fixed at the top of the lifting push plate.
[0014] Preferably, the palletizing guiding mechanism includes an inclined guiding plate. Second limit baffles are fixed on both sides of the top of the inclined guiding plate. A vertical baffle is fixed on the side of the inclined guiding plate away from the circulating lifting belt. A vibration motor is installed on the inclined guiding plate, and a blanking port is opened on the side of the inclined guiding plate away from the circulating lifting belt.
[0015] Preferably, a vertically arranged limiting blanking cylinder is fixed below the inclined guiding plate. The limiting blanking cylinder corresponds to the blanking port. A narrow plate is fixed at one end of the inclined guiding plate close to the circulating lifting belt. The width of the narrow plate is smaller than the distance between the two strip-shaped brackets. A gap for the strip-shaped bracket to pass through is left between both sides of the narrow plate and the second limit baffle.
[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The visual inspection of cigarette packages is carried out by a photographing detector, and the combination of a sorting cylinder and a sorting push plate realizes the automatic rejection of defective products, avoiding the misjudgment and inefficiency of manual inspection, improving the sorting accuracy, and achieving the purpose of intelligent detection and precise sorting.
[0017] 2. The automatic grasping and boxing of cigarette packages are realized by the box-packing manipulator equipped with suction cups. The circulating lifting belt cooperates with the good-product storage box bracket to complete the full-box transportation. The palletizing guiding mechanism (including an inclined guiding plate and a vibration motor) ensures the orderly falling of the boxes. Combined with the automatic lifting of the lifting tray, unmanned palletizing is realized, reducing the manual handling cost.
[0018] 3. The distance of the first limit baffle is adjusted through a sliding rod and a bolt to adapt to cigarette packages of different sizes; the limit parts on the strip-shaped bracket are adjustable through waist-shaped round holes to be compatible with storage boxes of different specifications. The cooperation of the flipping gear and the semi-circular rack ensures the horizontal transportation of the bracket, avoiding the tilting and sliding of the boxes.
[0019] 4. The driving box and the threaded rod drive the lifting push plate. The positioning pin and the positioning sleeve ensure the stability of the palletizing process. The vibration motor assists the cigarette packages to slide evenly on the inclined guiding plate, avoiding jams and improving the reliability of the system. Description of the Drawings
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0021] Figure 1 It is the top view of the intelligent sorting unit of the present invention; Figure 2 It is the first perspective three-dimensional view of the intelligent sorting unit of the present invention; Figure 3 It is the second perspective three-dimensional view of the intelligent sorting unit of the present invention; Figure 4 It is the front view of the palletizing integration system of the present invention; Figure 5 It is the three-dimensional view of the palletizing integration system of the present invention; Figure 6 It is the structural schematic diagram of the installation platform in the palletizing integration system of the present invention; Figure 7 It is Figure 6 the enlarged detail view of position A in Figure 8 It is the first perspective three-dimensional view of the palletizing guiding mechanism of the present invention; Figure 9 It is the second perspective three-dimensional view of the palletizing guiding mechanism of the present invention; Figure 10 It is the bottom view of the good product storage box bracket of the present invention; Figure 11 It is the top view of the good product storage box bracket of the present invention; Figure 12 It is the three-dimensional view of the good product storage box bracket of the present invention; In the figure: 1, sorting conveyor belt; 101, first limit baffle; 102, sliding rod; 103, bolt; 104, detection platform; 105, photo detector; 106, sorting cylinder; 107, sorting push plate; 108, good product storage box; 109, defective product storage box; 2, packing manipulator; 201, suction cup; 3, circulating lifting belt; 301, semi-circular rack; 4, good product storage box bracket; 401, connecting rod; 402, connecting frame; 403, strip bracket; 4031, limiting part; 404, flipping gear; 405, support rotating shaft; 5, support guide rod; 501, installation platform; 502, drive box; 5021, threaded rod; 503, inclined guide plate; 5031, second limit baffle; 5032, vertical baffle; 5033, blanking port; 5034, limiting blanking cylinder; 5035, narrow plate; 6, lifting tray; 601, positioning sleeve; 701, guiding sleeve; 7, lifting push plate; 702, threaded sleeve; 703, positioning pin. Detailed implementation manners
[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0023] Embodiment 1 Refer to Figures 1-12 , an intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packets, including an intelligent sorting unit and an automatic palletizing unit. The intelligent sorting unit includes a sorting conveyor belt 1 and a packing manipulator 2. One end of the sorting conveyor belt 1 is provided with a detection platform 104. A sorting cylinder 106 is installed on one side of the detection platform 104. The output shaft of the sorting cylinder 106 is fixed with a sorting push plate 107. A good product storage box 108 and a defective product storage box 109 are placed beside the detection platform 104. A photo detector 105 is provided directly above the detection platform 104; After the cigarette packets are completed with inkjet coding, they are conveyed to the sorting conveyor belt 1 through a conveyor belt, and then conveyed to the detection platform 104 through the sorting conveyor belt 1. There is a material sensor on the detection platform 104. When the sensor detects that there is a cigarette packet on the detection platform 104, the sorting conveyor belt 1 pauses. The cigarette packet on the detection platform 104 is photographed and compared by the photographing detector 105. If it is found that the appearance of the cigarette packet is damaged and the inkjet coding is unclear, it is determined as a defective product. The defective product storage box 109 is located on the side of the detection platform 104 away from the sorting cylinder 106. When the sorting cylinder 106 extends, it drives the sorting push plate 107 to push the defective product into the defective product storage box 109. If the cigarette packet is a qualified product, the packing manipulator 2 moves the cigarette packet and neatly stacks it in the qualified product storage box 108. A suction cup 201 is installed on the packing manipulator 2, and the cigarette packet can be picked up and put down by the suction cup.
[0024] The automatic palletizing unit includes a circulating lifting belt 3. A plurality of qualified product storage box brackets 4 are equidistantly distributed on the circulating lifting belt 3. One side of the circulating lifting belt 3 is provided with a vertically arranged support guide rod 5. The top of the support guide rod 5 is fixed with an installation platform 501. A palletizing guide mechanism is arranged below the installation platform 501, and a lifting tray 6 is arranged below the palletizing guide mechanism; When the qualified product storage box 108 is filled with cigarette packets, the top of the qualified product storage box 108 is covered with a lid, and then it is placed on the qualified product storage box bracket 4 on the circulating lifting belt 3. Through the circulating lifting on the circulating lifting belt 3, it can be moved to the position of the palletizing guide mechanism, and then it falls onto the lifting tray 6 through the palletizing guide mechanism. Every time a qualified product storage box 108 falls, the lifting tray 6 moves down by the height of a qualified product storage box 108, so as to achieve the purpose of automatic palletizing. After palletizing is completed, the lifting tray 6 can be forklifted away by a forklift.
[0025] Embodiment 2 Refer to Figures 1-12 This example is different from Embodiment 1 in that a pair of parallel first limit baffles 101 are provided at the top of the sorting conveyor belt 1. The first limit baffles 101 are movably installed through a slide rod 102, and the position of the slide rod 102 is fixed by a bolt 103. The cigarette packet passes through the gap between the two first limit baffles 101, which can ensure that when the cigarette packet moves to the detection platform 104, its position will not shift or tilt, facilitating photographing detection and the transfer of the packing manipulator 2. The distance between the two first limit baffles 101 can be adjusted, so it can be adjusted according to the actual size of the cigarette packet.
[0026] Embodiment 3 Refer to Figures 1-12, The difference between this example and Example 1 is that the good product storage box bracket 4 includes two connecting rods 401 arranged in parallel with each other. The connecting rods 401 are perpendicular to the circulating lifting belt 3, and a support rotating shaft 405 is rotatably installed between the ends of the connecting rods 401 away from the circulating lifting belt 3. A connecting frame 402 is fixed on the support rotating shaft 405, and two horizontally arranged strip brackets 403 are fixed at one end of the connecting frame 402 away from the support rotating shaft 405; When placing the good product storage box 108, the good product storage box 108 is placed on the top of the strip bracket 403. A limiting member 4031 is fixed on the top of the strip bracket 403. The limiting member 4031 is fixed in an oblong hole on the strip bracket 403 by bolts. A pair of limiting members 4031 are provided on each strip bracket 403. The good product storage box 108 is just stuck between the pair of limiting members 4031, which can ensure the stability of the good product storage box 108 during the lifting and transportation process. The position of the limiting member 4031 can be adjusted according to the actual size of the good product storage box 108.
[0027] Example 4 Refer to Figures 1-12 , The difference between this example and Example 3 is that in order to ensure that when the circulating lifting belt 3 transports the good product storage box 108, the good product storage box 108 always remains at the top of the strip bracket 403, a reversing gear 404 is fixed at one end of the support rotating shaft 405. Semi-circular racks 301 are provided at both the top and bottom of the installation bracket of the circulating lifting belt 3. The diameter of the semi-circular rack 301 is the same as the diameter of the reversing gear 404. When the good product storage box 108 moves to the top or bottom position of the circulating lifting belt 3, the reversing gear 404 will engage with the semi-circular rack 301 and drive the support rotating shaft 405 to rotate, thereby driving the connecting rod 401 and the strip bracket 403 to rotate accordingly. This rotation will exactly offset the angle rotated when following the movement of the circulating lifting belt 3, so as to ensure that the strip bracket 403 always remains in a horizontal state, and the good product storage box 108 can stably stay at the top of the strip bracket 403.
[0028] Example 5 Refer to Figures 1-12 , The difference between this example and Example 4 is that a driving box 502 is fixed at the top of the installation platform 501. A threaded rod 5021 is rotatably installed at the bottom of the installation platform 501. The threaded rod 5021 is driven to rotate by the driving box 502. A lifting push plate 7 is slidably installed outside the support guide rod 5 through a guide sleeve 701. A threaded sleeve 702 is installed on the lifting push plate 7. The threaded sleeve 702 is threadedly installed outside the threaded rod 5021. Positioning sleeves 601 are fixed at the four corners of the bottom of the lifting tray 6, and positioning pins 703 corresponding to the positioning sleeves 601 are fixed at the top of the lifting push plate 7; By driving the rotation of the threaded rod 5021 through the drive box 502, the lifting push plate 7 can be driven to move up and down, and then the lifting tray 6 can be driven to move up and down. Since the positioning pin 703 is inserted into the positioning sleeve 601, the stability of the lifting tray 6 during the up and down movement can be ensured, and the lifting tray 6 can be easily forklifted away by a forklift, so as to centrally transfer the good product storage boxes 108 stacked on the top of the lifting tray 6.
[0029] Embodiment 5 Refer to Figures 1-12 , the difference between this example and Embodiment 4 is that the palletizing guiding mechanism includes an inclined guiding plate 503. Both sides of the top end of the inclined guiding plate 503 are fixed with second limiting baffles 5031. A vertical baffle 5032 is fixed on the inclined guiding plate 503 away from the side of the circulating lifting belt 3. A vibration motor is installed on the inclined guiding plate 503, and a blanking port 5033 is opened on the inclined guiding plate 503 away from the side of the circulating lifting belt 3. A vertically arranged limiting blanking cylinder 5034 is fixed below the inclined guiding plate 503, and the limiting blanking cylinder 5034 corresponds to the position of the blanking port 5033. A narrow plate 5035 is fixed at one end of the inclined guiding plate 503 close to the circulating lifting belt 3. The width of the narrow plate 5035 is smaller than the distance between two strip-shaped brackets 403, and gaps for the strip-shaped brackets 403 to pass through are left between both sides of the narrow plate 5035 and the second limiting baffles 5031; When the good product storage box bracket 4 with the good product storage box 108 placed on it moves to one side of the palletizing guiding mechanism and moves downward, the narrow plate 5035 passes through the gap between the two strip-shaped brackets 403. The good product storage box 108 is located at the top end of the narrow plate 5035. When the good product storage box bracket 4 continues to move downward, the good product storage box 108 is separated from the good product storage box bracket 4 and stays at the top end of the narrow plate 5035, and then slides down along the inclined guiding plate 503 and falls into the limiting blanking cylinder 5034 through the blanking port 5033, and finally falls onto the lifting tray 6. Then the lifting tray 6 descends a distance equal to the height of one good product storage box 108, leaving a space for the next good product storage box 108 to be stored. In this way, the good product storage boxes 108 can be continuously palletized.
[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0031] In the present invention, unless otherwise clearly specified and defined, terms such as "arranged", "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] The control method of the present invention is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming by those skilled in the art. The provision of power also belongs to the common knowledge in the art. Moreover, the present invention is mainly used to protect mechanical devices, so the control method and circuit connection of the present invention will not be explained in detail.
Claims
1. An intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packages, comprising an intelligent sorting unit and an automatic palletizing unit, characterized in that: The intelligent sorting unit comprises a sorting conveyor belt (1) and a packing robot (2); a detection platform (104) is provided at one end of the sorting conveyor belt (1); a sorting cylinder (106) is installed on one side of the detection platform (104); a sorting push plate (107) is fixed to the output shaft of the sorting cylinder (106); a good product storage box (108) and a bad product storage box (109) are placed beside the detection platform (104); and a photo detector (105) is provided directly above the detection platform (104); The automatic palletizing unit comprises a circulating lifting belt (3), on which a plurality of good product storage box brackets (4) are evenly distributed, a vertically arranged support guide rod (5) is provided on one side of the circulating lifting belt (3), a mounting platform (501) is fixed to the top of the support guide rod (5), a palletizing guide mechanism is provided below the mounting platform (501), and a lifting tray (6) is provided below the palletizing guide mechanism.
2. According to claim 1, the intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packages is characterized by: A suction cup (201) is installed on the box packing robot (2), and the defective product storage box (109) is located on a side of the detection platform (104) away from the sorting cylinder (106).
3. According to claim 1, the intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packages is characterized by: A pair of first position-limiting baffles (101) arranged in parallel are provided at the top end of the sorting conveyor belt (1). The first position-limiting baffles (101) are movably installed via a slide bar (102), and the position of the slide bar (102) is fixed via a bolt (103).
4. According to claim 1, the intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packages is characterized by: The good product storage box bracket (4) comprises two connecting rods (401) arranged parallel to each other, the connecting rods (401) are arranged perpendicular to the circulating lifting belt (3), and a supporting shaft (405) is rotatably installed between the ends of the connecting rods (401) away from the circulating lifting belt (3), a connecting frame (402) is fixed on the supporting shaft (405), and two horizontally arranged strip brackets (403) are fixed on the end of the connecting frame (402) away from the supporting shaft (405).
5. The intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packages according to claim 4 is characterized by: A limiting member (4031) is fixed at the top end of the strip-shaped bracket (403), and the limiting member (4031) is fixed in a waist-shaped hole on the strip-shaped bracket (403) by means of bolts. Each strip-shaped bracket (403) is provided with a pair of limiting members (4031).
6. The intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packages according to claim 4 is characterized by: A flip gear (404) is fixed to one end of the support shaft (405), and a semi-circular rack (301) is provided at the top and bottom ends of the mounting bracket of the circulating lifting belt (3), and the diameter of the semi-circular rack (301) is the same as the diameter of the flip gear (404).
7. The intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packages according to claim 4 is characterized by: A driving box (502) is fixed to the top of the mounting platform (501), a threaded rod (5021) is rotatably mounted on the bottom of the mounting platform (501), the threaded rod (5021) is driven to rotate by the driving box (502), and a lifting push plate (7) is slidably mounted on the outside of the supporting guide rod (5) via a guide sleeve (701).
8. The intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packages according to claim 7 is characterized by: A threaded sleeve (702) is installed on the lifting push plate (7), and the threaded sleeve (702) is threadedly installed on the outside of the threaded rod (5021). The four corners at the bottom of the lifting tray (6) are all fixed with positioning sleeves (601), and the top of the lifting push plate (7) is fixed with a positioning pin (703) corresponding to the positioning sleeve (601).
9. The intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packages according to claim 4 is characterized by: The stacking guide mechanism comprises an inclined guide plate (503), second limit baffles (5031) are fixed to both sides of the top of the inclined guide plate (503), a vertical baffle (5032) is fixed to the side of the inclined guide plate (503) away from the circulating lifting belt (3), a vibration motor is installed on the inclined guide plate (503), and a material drop opening (5033) is opened on the side of the inclined guide plate (503) away from the circulating lifting belt (3).
10. The intelligent mechanical sorting and palletizing integrated system for the post-printing process of cigarette packages according to claim 9, characterized in that: A vertically arranged limiting blanking cylinder (5034) is fixed below the inclined guide plate (503), and the limiting blanking cylinder (5034) corresponds to the position of the blanking port (5033). A narrow plate (5035) is fixed to one end of the inclined guide plate (503) close to the circulating lifting belt (3), and the width of the narrow plate (5035) is smaller than the spacing between the two strip brackets (403). A gap for the strip bracket (403) to pass through is left between the two sides of the narrow plate (5035) and the second limiting baffle (5031).