License plate automatic packing machine

Abstract

The present invention relates to the technical field of motor vehicle license plate packing machines, and discloses an automatic license plate packing machine, comprising a license plate conveyor belt, an automatic lining paper conveying and cutting assembly for conveying and cutting lining paper, a movable lining paper clamping claw, and a license plate clamping manipulator assembly. An air shaft unwinding cooperates with a gravity pressure roller to cache the lining paper in a lining paper buffer bin. A carton clamping claw mechanism places a carton in a carton placement area. After the lining paper cached in the buffer bin assembly passes through a paper feeding roller group, the movable lining paper clamping claw moves to clamp the lining paper. The paper feeding roller group and the movable lining paper clamping claw operate simultaneously to pull the lining paper to a predetermined position. The signed license plate is conveyed to a license plate limit position by a license plate conveyor belt. The license plate clamping claw mechanism clamps the license plate and the lining paper above it. The movable lining paper clamping claw releases the lining paper and moves to separate from the lining paper. The paper cutting mechanism cuts the lining paper. The license plate clamping claw mechanism places the license plate and the lining paper into a carton. This avoids paper being delivered out of place and improves the degree of automation of the automatic license plate packing machine.

Description

Technical Field

[0001] The present invention relates to the technical field of motor vehicle license plate packing machines, in particular to an automatic license plate packing machine. Background Art

[0002] When motor vehicle license plates are produced, they need to be signed with information to facilitate their management. The signed license plates are collected in boxes and stored or transported in boxes. A layer of isolation paper (backing paper) needs to be placed between two adjacent license plates to prevent them from sticking together when stacked.

[0003] The paper feeding function of the existing license plate packing machine is unstable. The paper roll is pulled by the paper feeding roller group, and the paper roll is passively fed. The paper feeding speed is slow, and it is easy to cause the paper to be not fed into place. In addition, the isolation paper between the paper feeding roller group and the paper roll is easy to deform, wrinkle and squeeze the paper, causing malfunctions.

[0004] Furthermore, cartons cannot be automatically placed in designated locations. Each packing process requires manual effort to place cartons in place. Furthermore, after the number plates are loaded into the cartons, they cannot be connected to automated carton handling devices (such as AGVs or conveyor belts). Full cartons with number plates installed require manual handling. This results in low efficiency, high labor requirements, and a low degree of automation. Summary of the Invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide an automatic license plate packing machine, which avoids the problem of paper not being discharged in place and does not require manpower to place empty cartons in advance. After the license plate packing is completed, it can be connected to the automatic box receiving device to avoid manual handling, which can improve the degree of automation of the automatic license plate packing machine.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A license plate automatic packing machine includes a frame on which a license plate conveyor belt for conveying license plates, an automatic backing paper conveying and cutting assembly for conveying and cutting backing paper, a movable backing paper clamping claw, and a license plate clamping manipulator assembly are installed.

[0008] The movable liner paper clamp is located above the license plate conveyor belt. A linear guide rail assembly is provided between the movable liner paper clamp and the frame. The extension direction of the linear guide rail assembly is parallel to the conveying direction of the license plate conveyor belt.

[0009] The automatic liner paper conveying and cutting assembly includes a main body plate, on which are mounted an inflatable shaft for placing a paper roll, a paper feeding pressure roller group for feeding paper, and a paper cutting mechanism for cutting paper; a liner paper buffer bin assembly is provided below the inflatable shaft, and the liner paper buffer bin assembly includes a buffer bin, a guide roller, and a gravity pressure roller; the guide roller is installed in the buffer bin, a vertical guide is provided on the bin wall of the buffer bin, the gravity pressure roller is slidably connected to the buffer bin through the vertical guide, and a proximity switch is fixed to the bottom of the buffer bin; when the gravity pressure roller slides to the lower end along the vertical guide, the proximity switch is actuated, so that the inflatable shaft stops rotating and unwinding;

[0010] The number plate clamping manipulator assembly includes a carton clamping mechanism for clamping cartons and a number plate clamping mechanism for clamping number plates and lining paper. The carton clamping mechanism clamps the carton and places it in the carton placement area.

[0011] The backing paper cached in the buffer bin is fed a certain distance by the paper feeding roller group, and the movable backing paper clamp moves close to the paper feeding roller group to clamp the backing paper. The paper feeding roller group and the movable backing paper clamp operate simultaneously to pull the backing paper to a predetermined position for standby.

[0012] When the license plate after the signing is completed is transported to the license plate limit position by the license plate conveyor belt, the license plate clamping mechanism moves and clamps the license plate and the lining paper above it, and then the movable lining paper clamp releases the lining paper and moves outward until it is separated from the lining paper, the paper cutting mechanism cuts the lining paper, and the license plate clamping mechanism places the clamped license plate and the lining paper into the carton at the carton placement area.

[0013] Preferably, the movable liner paper clamp is mounted on a clamp bracket, and the movable liner paper clamp comprises a clamp power device, an upper clamp plate and a lower clamp plate, and the clamp power device drives the upper clamp plate to move closer to or away from the lower clamp plate to clamp or release the liner paper.

[0014] The linear guide rail assembly includes a guide rail and a slider. The slider can move along the guide rail. The guide rail is fixed on the frame. The guide rail is arranged parallel to the license plate conveyor belt. The clamping claw bracket is fixedly connected to the slider.

[0015] Preferably: an empty box straightening mechanism and a full box pushing mechanism are provided at the carton placement area, the empty box straightening mechanism comprises a carton placement bottom plate fixed to the frame, a side plate perpendicular to and fixed to the carton placement bottom plate, a movable straightening plate, a liftable straightening plate and a movable straightening arm, the movable straightening plate is opposite to the side plate, the carton placement bottom plate is provided with a straightening plate avoidance hole for the liftable straightening plate to pass through, a first power device drives the liftable straightening plate to extend from or retract into the carton placement bottom plate, the liftable straightening plate is opposite to the movable straightening arm, a second power device drives the movable straightening plate to approach or move away from the side plate, and a third power device drives the movable straightening arm to approach or move away from the liftable straightening plate;

[0016] The full box ejection mechanism includes an ejection plate and a carton ejection power device. The ejection plate is provided with a straightening arm avoidance hole for the movable straightening arm to pass through. The carton ejection power device pushes the ejection plate to extend or retract.

[0017] Preferably: the vertical guide member is a vertical long guide hole, and the vertical long guide hole is opened on two opposite warehouse walls of the buffer warehouse, the paper feeding pressure roller group includes a first rubber pressure roller and a second rubber pressure roller, the middle part of the second rubber pressure roller is provided with an oblique protrusion, and the middle part of the first rubber pressure roller is provided with an oblique depression adapted to the oblique protrusion, when the first rubber pressure roller and the second rubber pressure roller are in contact with each other, the oblique protrusion cooperates with the oblique depression to press the middle part of the passing liner paper into an anti-curling vertical groove to prevent the liner paper from curling.

[0018] Preferably, the first rubber pressure roller is slidably connected to the main body plate, the second rubber pressure roller is rotatably mounted on the main body plate, the first power device pushes the first rubber pressure roller against the second rubber pressure roller, and the second power device drives the second rubber pressure roller to rotate.

[0019] Preferably: the paper cutting mechanism is located below the inflatable shaft and above the buffer bin, the paper cutting mechanism includes a fixed cutter and a movable cutter, one end of the movable cutter is hinged to the fixed cutter, and the other end of the movable cutter is connected to a cutting cylinder, and the cutting cylinder drives the movable cutter to open and close relative to the fixed cutter for cutting, and an auxiliary cutting component is provided on the main body panel, and the auxiliary cutting component pulls the movable cutter against the fixed cutter during cutting, and the direction in which the auxiliary cutting component pulls the movable cutter is perpendicular to the direction in which the cutting cylinder drives the movable cutter.

[0020] Preferably, the cutting cylinder includes a cylinder rod, and the other end of the movable cutter is connected to the cylinder rod through a floating joint.

[0021] Assume that the liner paper is conveyed from upstream to downstream, the fixed cutter and the movable cutter are located downstream of the paper feeding roller group, and the movable cutter is located downstream of the fixed cutter.

[0022] The auxiliary cutting assembly includes a fixing pin, a spring and a spring connecting plate, the spring connecting plate is connected to the cylinder rod, the fixing pin is fixed to the main body plate, the two ends of the spring are respectively connected to the fixing pin and the cylinder rod, the pulling direction of the spring is perpendicular to the extending direction of the cylinder rod, and the spring pulls the movable cutter upstream to the fixed cutter.

[0023] Preferably: the license plate clamping robot assembly includes a mounting base plate, the carton clamping mechanism and the license plate clamping mechanism are mounted on the mounting base plate, the carton clamping mechanism includes a carton clamping drive device and two carton clamps arranged opposite to each other, the carton clamping drive device drives the two carton clamps to move relative to each other to clamp the carton, the license plate clamping mechanism includes a license plate clamping drive device, two license plate clamps arranged opposite to each other and a linear guide assembly, the linear guide assembly is arranged between the license plate clamping jaws and the mounting base plate, the license plate clamping drive device drives the two license plate clamps to move relative to each other along the linear guide assembly to clamp the license plate, a lining paper pressing device is fixed on the inner side of the license plate clamping jaw, and the two carton clamping jaws are located between the two license plate clamping jaws.

[0024] Preferably, the carton clamp driving device includes two cylinders, the two cylinders are respectively a first cylinder and a second cylinder, the two carton clamps are respectively a first carton clamp and a second carton clamp, the first cylinder drives the first carton clamp, the second cylinder drives the second carton clamp, the first carton clamp and the second carton clamp move relative to each other simultaneously to clamp the carton;

[0025] The mounting base plate is provided with a first avoidance hole and a second avoidance hole. The first avoidance hole is used to avoid the movement of the first carton clamping jaw, and the second avoidance hole is used to avoid the movement of the second carton clamping jaw.

[0026] Preferably: the license plate clamp driving device includes two cylinders, the two cylinders are the third cylinder and the fourth cylinder, the two license plate clamps are the first license plate clamp and the second license plate clamp, the third cylinder drives the first license plate clamp, and at the same time, the fourth cylinder drives the second license plate clamp, the first license plate clamp and the second license plate clamp move relative to each other at the same time to clamp the license plate.

[0027] After adopting the above technical solution, the beneficial effects of the present invention are:

[0028] The automatic number plate packing machine of the present invention uses a number plate conveyor belt to transport signed number plates. The signed number plates are output from the conveyor belt of the number plate marking machine. The number plate conveyor belt conveys the signed number plates from the outer end of the belt toward the paper feed roller group, in the opposite direction of the lining paper. The paper roll is placed on an inflatable shaft and fixed. The beginning of the lining paper is opened and passed through the gravity pressure roller of the lining paper buffer. The lining paper is wrapped around the gravity pressure roller. The inflatable shaft rotates to unwind the paper roll. The gravity pressure roller moves downward along the vertical long guide hole under its own weight, thereby pulling the lining paper downward and pre-caching a section of lining paper in the buffer. The pre-unwinding and cached lining paper ensures that the lining paper delivered between the paper feed roller group and the paper roll is controlled and does not deform or wrinkle. Even if the paper on the paper roll decreases, the working demand of the paper feed roller group will not be met, so that the paper output and the working rhythm of the paper feed roller group are matched, avoiding the phenomenon of paper output not being in place.

[0029] While the pre-reeled buffered liner paper is being unwound, the carton gripper mechanism picks up the carton and places it in the carton storage area. The empty box straightening mechanism automatically straightens the carton, and a QR code reader identifies the QR code on the carton, prompting the overall control system to issue a production order. A pre-stored section of liner paper passes through the paper feed roller assembly and protrudes a certain distance between the fixed and movable cutters of the paper cutting mechanism. The movable liner gripper moves to its inner limit position (near the paper feed roller assembly) to clamp the liner paper. Once clamped, the movable liner gripper moves along the linear guide assembly, while the two paper feed rollers rotate simultaneously, pulling the liner paper to a predetermined position for standby operation. The license plate gripping robot assembly is operated by the robot arm to hover a certain distance above the lining paper (the lining paper is now in a predetermined position on standby). After the license plate is signed by the signing machine, it is transported to the license plate conveyor belt of the license plate automatic cartoning machine of the present invention. When the license plate after signing is transported to the license plate limit position by the license plate conveyor belt, the license plate after signing will temporarily stay there. The license plate gripping robot assembly moves downward to the appropriate position, and the license plate clamping mechanism moves and clamps the license plate and the lining paper above it. The movable lining paper clamping claw then releases the lining paper and moves outward until it is completely separated from the lining paper. The paper cutting mechanism cuts the lining paper, and then the license plate clamping mechanism clamps the license plate and lining paper and lifts them. Through the operation of the robot arm, the license plate clamping mechanism places the clamped license plate and lining paper (the cut lining paper) into the carton in the carton placement area. After the license plates fill the box, the full box pushing mechanism automatically pushes them to the corresponding automatic docking device, and the full box is removed by the automatic docking device.

[0030] The license plate gripping robot assembly can not only grab the license plate and lining paper at the same time, but also grip the cartons, eliminating the need for manpower to place the cartons in advance. It can also connect to the automatic carton receiving device to avoid manual handling, greatly improving the degree of automation.

[0031] The pneumatic shaft is equipped with a paper roll baffle to prevent paper roll skew, misplaced feeding, and paper roll spillage. The second pressure roller features an oblique projection in the middle, while the first pressure roller features a matching oblique depression in the middle. When the first and second pressure rollers are in contact, the oblique projection and depression cooperate to press a vertical anti-curl groove into the middle of the passing liner paper, preventing it from curling. The anti-curl groove extends along the length of the liner. This groove maintains the liner's shape after delivery, preventing it from curling and potentially losing its protective function.

[0032] In summary, the automatic cartoning machine for number plates of the present invention controls the lining paper sent between the paper feeding roller group and the paper roll to not be deformed or wrinkled, and avoids the phenomenon of paper not being discharged in place, and does not cause the paper feeding roller group to squeeze the paper and cause a malfunction. The movable lining paper clamp cooperates with the paper feeding roller group to send out the lining paper, ensuring that the length of each lining paper is uniformly controlled and neat, and the lining paper can be pulled out in advance to wait for the number plate to move, thereby reducing the paper discharge time. In addition, there is no need for manpower to place empty cartons in advance. The number plate clamping robot assembly can automatically clamp the empty cartons, and can clamp the number plates and lining paper and put them into the empty cartons that are just right. After the number plates are filled in the box, they can be docked with the automatic box docking device, and the full box pushing mechanism automatically pushes the full box onto the corresponding automatic docking equipment. The full box is removed by the automatic docking equipment, thereby avoiding manual handling. During the use of the automatic cartoning machine for number plates of the present invention, manual labor is greatly reduced, and the degree of automation of the automatic cartoning machine for number plates is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings and examples.

[0034] Figure 1 It is a structural schematic diagram of the automatic license plate packing machine of the present invention;

[0035] Figure 2 yes Figure 1 Schematic diagram of the structure of the medium-sized brand automatic case packing machine, omitting the manipulator and part of the machine cover;

[0036] Figure 3 This is a schematic diagram of the structure of the license plate automatic packing machine with the robot, part of the machine cover and license plate conveyor belt hidden;

[0037] Figure 4 It is a structural diagram of the empty box straightening mechanism;

[0038] Figure 5 It is a structural schematic diagram of the automatic liner paper conveying and cutting assembly of the present invention;

[0039] Figure 6 yes Figure 5 The schematic diagram of the structure of the automatic paper conveying and cutting assembly is shown without the side baffles;

[0040] Figure 7 yes Figure 5 Side view of the automatic transfer and cutting assembly for the interlining paper, with the side panels of the bin hidden;

[0041] Figure 8 yes Figure 5 A schematic structural diagram of the automatic paper conveying and cutting assembly from another perspective;

[0042] Figure 9 This is a schematic diagram showing the liner roll being placed on the liner automatic conveying and cutting assembly;

[0043] Figure 10 It is a structural schematic diagram of the license plate gripping manipulator assembly of the present invention;

[0044] Figure 11 yes Figure 10 The schematic diagram is shown with the photoelectric switch and a carton gripper omitted.

[0045] Figure 12 This is a structural schematic diagram of the license plate gripping manipulator assembly of the present invention from another perspective;

[0046] In the figure: 1. Frame; 2. Automatic liner paper conveying and cutting assembly; 200. Main body plate; 201. Air shaft; J. Paper roll; 2011. First motor; 2012. Reducer; 2021. Buffer bin; 20221. First guide roller; 20222. Second guide roller; 20223. First auxiliary guide roller; 20224. Second auxiliary guide roller; 2023. Gravity pressure roller; 2024. Proximity switch; 20211. Vertical long guide hole; 2001. Bin side plate; 2002. Bin bottom plate; 2031. First rubber pressure roller; 2032. Second rubber pressure roller; 20321. Oblique protrusion; 20311. Oblique Concave; 2033, cylinder; 2003, connecting bracket; 2041, second motor; 2042, driving pulley; 2043, driven pulley; 2045, synchronous belt; 2051, fixed cutter; 2052, movable cutter; 2053, cutting cylinder; 2004, avoidance hole; 206, floating joint; 2071, fixing pin; 2072, spring; 2073, spring connecting plate; 2081, fixed baffle; 2082, movable baffle; 2083, adjusting oblong hole; 2084, round hole; 3, license plate gripping robot assembly; 300, mounting base plate; 301, first cylinder; 302, second cylinder; 303, first carton gripper; 304, second carton gripper; 305, third cylinder; 306, fourth cylinder; 307, first license plate gripper; 308, second license plate gripper; 3001, first avoidance hole; 3002, second avoidance hole; 3031, carton clamping plate; 3032, rubber pad; 3033, carton gripper reinforcement rib; 30311, gripper arm; 30312, observation hole; 30313, reinforcement rib; 3091, positioning wheel bracket; 3092, positioning wheel; 30921, mounting oblong hole; 3010, support column plate; 3011, photoelectric switch; 3012, sensor; 3013, guide rail ; 3014, slider; 4, movable liner paper clamp; 401, clamp power unit; 402, upper clamp; 403, lower clamp; 5, license plate conveyor belt; 501, motor; 502, first belt transmission mechanism; 6, clamp bracket; 601, first guide rail; 602, first slider; 700, side panel; 7001, scanning window; 701, carton placement bottom plate; 702, push-out plate; 703, movable straightening plate; 704, liftable straightening plate; 705, second power unit; 706, first power unit; 707, movable straightening arm; 708, third power unit; 8, license plate baffle; G, carton placement area. DETAILED DESCRIPTION

[0047] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0049] In addition, although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0050] For ease of description, we Figures 1 to 3 The reference coordinates are assumed in the present invention, and the setting of the reference coordinates cannot be understood as a limitation to the present invention.

[0051] like Figures 1 to 3 The automatic number plate packing machine shown in the figure has a number plate conveyor belt 5 for conveying number plates, an automatic backing paper conveying and cutting assembly 2 for conveying and cutting backing paper, a movable backing paper clamp 4 and a number plate clamping robot assembly 3 installed on the frame 1.

[0052] The motor 501 drives the license plate conveyor belt 5 to operate through the first belt transmission mechanism 502. The first belt transmission mechanism 502 includes a first driving pulley, a first driven pulley and a first synchronous belt. The first synchronous belt is wound around the first driving pulley and the first driven pulley.

[0053] The movable liner paper clamp 4 is located above the license plate conveyor belt 5. A linear guide assembly is provided between the movable liner paper clamp 4 and the frame 1. The movable liner paper clamp 4 can reciprocate along the linear guide assembly. The extension direction of the linear guide assembly is parallel to the conveying direction of the license plate conveyor belt 5.

[0054] The automatic liner paper conveying and cutting assembly 2 includes a main body plate 200, on which are installed an inflatable shaft 201 for placing a paper roll J, a paper feeding roller group for feeding paper, and a paper cutting mechanism for cutting paper. A liner paper buffer bin assembly is arranged below the inflatable shaft 201, and the liner paper buffer bin assembly includes a buffer bin 2021, two guide rollers and a gravity pressure roller 2023. The guide roller and the gravity pressure roller both include a core shaft and a roller body. The roller body is sleeved outside the core shaft and rotates relative to the core shaft. The two ends of the core shaft extend out of the roller body respectively. Two spaced fixing rings are fixed on the roller body. The two fixing rings are used to limit the two sides of the liner paper to prevent the liner paper from deviating.

[0055] The guide roller is installed in the cache bin 2021, and the two ends of the guide roller's core shaft are respectively fixed on the two opposite side walls of the cache bin 2021. The two guide rollers are the first guide roller 20221 and the second guide roller 20222. A vertical guide is provided on the wall of the cache bin 2021. The gravity pressure roller 2023 is slidingly connected to the cache bin 2021 through the vertical guide. A proximity switch 2024 is fixed to the bottom of the cache bin 2021. When the gravity pressure roller 2023 slides to the lower end along the vertical guide, it will be sensed by the proximity switch 2024, and then the proximity switch 2024 will be activated to control the output shaft of the first motor 2011 to stop rotating, so that the inflatable shaft 201 stops rotating and unwinding.

[0056] A power unit that drives the pneumatic shaft 201 is fixed to the main plate 200. This power unit includes a first motor 2011 and a reducer 2012. The pneumatic shaft 201, first motor 2011, and reducer 2012 are all located near the top of the main plate 200. Specifically, one end of the pneumatic shaft 201 is connected to the reducer 2012, which is then connected to the first motor 2011. A paper roll J is sleeved around the pneumatic shaft 201, supporting and rotating the paper roll J for unwinding.

[0057] The license plate gripping manipulator assembly 3 includes a carton gripper mechanism for gripping cartons and a license plate gripper mechanism for gripping license plates. The carton gripper mechanism grips the carton and places it in the carton placement area G.

[0058] The license plate conveyor belt 5 moves the license plate from the outer end to the inner end of the belt, that is, conveys the license plate in the positive direction of the Y axis.

[0059] After the lining paper cached in the cache bin passes through the paper feeding roller group, the lining paper cached in the cache bin is sent out a certain distance by the paper feeding roller group, and the movable lining paper clamp 4 moves close to the paper feeding roller group to clamp the lining paper, and the paper feeding roller group and the movable lining paper clamp 4 operate simultaneously to pull the lining paper to a predetermined position and stand by. The license plate clamping robot assembly 3 is installed on the robot arm, and the license plate clamping robot assembly 3 is operated by the robot arm to hover a certain distance above the lining paper (the lining paper at this time is at a predetermined position and stand by), and the signing machine conveys the license plate to the license plate conveyor belt of the license plate automatic packing machine of the present invention after the signing is completed. When the license plate after signing is transported to the license plate limit position by the license plate conveyor belt 5, the structure for limiting the license plate at the license plate limit position is a license plate baffle 8, and the license plate baffle 8 is fixed on the frame.

[0060] The completed license plate will temporarily rest here. At this point, the license plate gripping robot assembly 3 moves downward to the appropriate position. The license plate gripping mechanism moves and clamps the license plate and the backing paper above it. During this process, the backing paper is pressed against the license plate by the positioning wheel 3092 of the license plate gripping robot assembly 3, preventing it from sliding or shifting. The movable backing paper gripping mechanism then releases the backing paper and moves outward until it is completely separated from it. The paper cutting mechanism cuts the backing paper, and the license plate gripping mechanism then grips the license plate and backing paper and lifts them. The gripping mechanism, through the operation of the robotic arm, places the gripped license plate and backing paper (after the cut backing paper) into the carton in the carton storage area. After dropping the license plate and backing paper, the license plate gripping robot assembly 3 resets itself, returning to its position above the license plate conveyor belt 5, where it remains on standby.

[0061] As the license plate clamping mechanism grips the license plate and backing paper and lifts, the space below it is large enough for the backing paper clamping mechanism to move. The paper feed roller assembly and the movable backing paper clamping mechanism 4 then repeat the previous paper feeding and pulling actions: "The backing paper cached in the buffer is fed a certain distance by the paper feed roller assembly. The movable backing paper clamping mechanism 4 moves closer to the paper feed roller assembly to clamp the backing paper. The paper feed roller assembly and the movable backing paper clamping mechanism 4 operate simultaneously to pull the backing paper to a predetermined position for standby use." The various components of the automatic license plate packing machine work together to continuously repeat this process, automatically packing the signed license plates.

[0062] like Figure 2 As shown, in some embodiments, the movable liner paper clamping jaw 4 is mounted on the clamping jaw support 6. The movable liner paper clamping jaw 4 includes a clamping jaw power unit 401, an upper clamping plate 402, and a lower clamping plate 403. The clamping jaw power unit 401 is preferably a pneumatic cylinder. The clamping jaw power unit 401 drives the upper clamping plate 402 to move toward or away from the lower clamping plate 403 to clamp or release the liner paper. The pneumatic cylinder drives the upper clamping plate 402 to move toward the lower clamping plate 403 to clamp the liner paper.

[0063] The linear guide rail assembly includes a first guide rail 601 and a first slider 602. The first slider 602 can move along the first guide rail 601. The first guide rail 601 is fixed on the frame 1. The first guide rail 601 is arranged parallel to the license plate conveyor belt 5. The clamping bracket 6 is fixedly connected to the first slider 602.

[0064] like Figures 2 to 4 As shown, an empty box straightening mechanism and a full box ejection mechanism are provided at the carton placement area G. The empty box straightening mechanism includes a carton placement base plate 701 fixed to the frame 1, a side plate 700 perpendicular to and fixed to the carton placement base plate 701, a movable straightening plate 703, a liftable straightening plate 704 and a movable straightening arm 707. The movable straightening plate 703 is opposite to the side plate 700. The carton placement base plate 701 is provided with a straightening plate avoidance hole for the liftable straightening plate 704 to pass through. The first power device 706 The liftable straightening plate 704 is driven to extend out of the carton placing bottom plate 701 or retract, and the liftable straightening plate 704 is positioned opposite to the movable straightening arm 707. The second power device 705 drives the movable straightening plate 703 to move closer to or away from the side plate 700. The first power device 706 preferably adopts a cylinder, the second power device 705 preferably adopts a cylinder, and the third power device 708 drives the movable straightening arm 707 to move closer to or away from the liftable straightening plate 704; the third power device 708 preferably adopts a cylinder.

[0065] The full box pushing mechanism includes a pushing plate 702 and a carton pushing power device. The pushing plate is provided with a straightening arm avoidance hole for the movable straightening arm 707 to pass through. The carton pushing power device pushes the pushing plate 702 to extend or retract. The carton pushing power device preferably adopts a cylinder.

[0066] The liftable straightening plate 704 rises and extends beyond the carton placement base 701. The number plate gripping robot assembly 3 grips the empty carton and places it on the carton placement base 701. The movable straightening plate 703 and movable straightening arm 707 move simultaneously, placing the empty carton against the side panels 700 and liftable straightening plate 704 to straighten the empty carton. The empty carton straightening mechanism prevents the carton from moving when the number plate is placed inside.

[0067] A QR code reader is installed at the empty box straightening mechanism near the carton placement area G. A scanning window 7001 is provided on the side panel 700. The QR code reader can recognize the QR code on the carton at the scanning window 7001. The carton gripper mechanism of the number plate gripping robot assembly 3 grabs the empty box delivered to the carton placement area. After the empty box straightening mechanism straightens and positions it, the QR code reader recognizes the QR code on the carton and issues a production task, waiting for the number plate to be placed in the carton. When the carton is full, it starts to match the external automatic carton receiving device, and at the same time, the liftable straightening plate 704 is lowered and retracted to be flush with or below the carton placement bottom plate 701. The push plate 702 of the full carton push mechanism pushes the carton onto the automatic carton receiving device, which then takes the carton away and transfers it.

[0068] In some embodiments: Figures 5 to 9 As shown, the vertical guide member is a vertical long guide hole 20211, which is opened on two opposite warehouse walls of the buffer warehouse 2021. The vertical long guide hole 20211 can allow the core shaft of the gravity pressure roller 2023 to slide.

[0069] Certainly, the vertical guide member can also be set to a guide rail bar, and the guide rail bar is provided with guide grooves for sliding of the two ends of the mandrel of the gravity pressing roller 2023. The vertical guide member can also be provided with other structures.

[0070] The paper feeding roller group and the paper cutting mechanism are located in the paper feeding and cutting bin. The paper feeding and cutting bin is provided with a bin side plate 2001 opposite to the main plate 200 and a bin bottom plate 2002 fixedly connecting the main plate 200 and the bin side plate 2001.

[0071] In some embodiments: the paper feeding roller group is located in the paper feeding and cutting bin, and the paper feeding roller group includes a first rubber pressure roller 2031 and a second rubber pressure roller 2032, that is, both ends of the first rubber pressure roller 2031 and the second rubber pressure roller 2032 are respectively connected and installed on the main plate 200 and the bin side plate 2001.

[0072] The first rubber pressure roller 2031 is slidably connected to the main plate 200 , and vertical long holes (the length of the holes is along the Z direction) are correspondingly opened on the main plate 200 and the side plate 2001 of the warehouse body. Both ends of the first rubber pressure roller 2031 can slide relative to the vertical long holes.

[0073] The first rubber pressure roller 2031 comprises a first central shaft and a first outer roller body. A bearing is installed between the first outer roller body and the first central shaft. The first outer roller body rotates relative to the first central shaft. The ends of the first central shaft extend beyond the first outer roller body. Material is removed from the two protruding ends of the first central shaft (i.e., the ends of the first outer roller body) to accommodate the width of the aforementioned vertical slot. The second rubber pressure roller 2032 comprises a second central shaft and a second outer roller body. The second outer roller body is secured to the second central shaft.

[0074] The second rubber pressing roller 2032 is rotatably mounted on the main body plate 200 . The first power device pushes the first rubber pressing roller 2031 against the second rubber pressing roller 2032 , and the second power device drives the second rubber pressing roller 2032 to rotate.

[0075] The first power unit is provided as a cylinder 2033. The cylinder body of cylinder 2033 is mounted on the main body plate 200 via a fixing plate. The piston rod of cylinder 2033 is connected to the first rubber pressure roller 2031 via a connecting bracket 2003. The connecting bracket 2003 is a U-shaped bracket comprising a cylinder support plate and roller connecting lugs. The two roller connecting lugs are fixed to each end of the cylinder support plate. The cylinder support plate is fixedly connected to the piston rod of the cylinder. The roller connecting lugs have mounting holes, into which the ends of the first rubber pressure roller 2031 are inserted. The cylinder pushes the connecting bracket 2003, bringing the first rubber pressure roller 2031 against the second rubber pressure roller 2032, to adjust the gap between the first and second rubber pressure rollers 2031 and 2032. This is more convenient and faster than adjusting the gap by adjusting limit bolts in the prior art.

[0076] like Figure 8 As shown, the second pressure roller 2032 is provided with an oblique protrusion 20321 in the middle, and the first pressure roller 2031 is provided with an oblique depression 20311 in the middle that matches the oblique protrusion 20321. When the first pressure roller 2031 and the second pressure roller 2032 are in contact, the oblique protrusion 20321 cooperates with the oblique depression 20311 to press the middle of the passing liner paper into an anti-curling groove, which extends along the length of the liner paper. The anti-curling groove maintains the shape of the liner paper after it is discharged, preventing the liner paper from curling and thus losing its protective function.

[0077] like Figure 6 and Figure 7 As shown, the second power device includes a second motor 2041, a driving pulley 2042, a driven pulley 2043 and a synchronous belt 2045. The output shaft of the second motor 2041 is fixedly connected to the driving pulley 2042, one end of the second rubber pressure roller 2032 is fixedly connected to the driven pulley 2043, and a synchronous belt 2045 is wound between the driving pulley 2042 and the driven pulley 2043.

[0078] A paper cutting mechanism for cutting paper is installed on the main plate 200. The paper cutting mechanism is located below the inflatable shaft 201 and above the buffer bin 2021. The paper cutting mechanism includes a fixed cutter 2051 and a movable cutter 2052. One end of the movable cutter 2052 is hinged to the fixed cutter 2051, and the other end of the movable cutter 2052 is connected to the cutting cylinder 2053. An avoidance hole 2004 for avoiding the movable cutter 2052 is opened on the main plate 200. The cutting cylinder 2053 drives the movable cutter 2052 to open and close relative to the fixed cutter 2051 for shearing. The working principle of the fixed cutter 2051 and the movable cutter 2052 when used for cutting paper is similar to that of a guillotine.

[0079] An auxiliary cutting assembly is provided on the main body plate 200 , which pulls the movable cutter 2052 against the fixed cutter 2051 during cutting. The direction in which the auxiliary cutting assembly pulls the movable cutter 2052 is perpendicular to the direction in which the cutting cylinder 2053 drives the movable cutter 2052 .

[0080] In some embodiments, the cutting cylinder 2053 includes a cylinder body and a cylinder rod. The cylinder body is fixed to the main plate 200 via a bracket. The other end of the movable cutter 2052 is connected to the cylinder rod via a floating joint 206, thereby preventing the cylinder rod from being bent or broken by the spring 2072 after long-term use. Assuming that the liner paper is transported from upstream to downstream, the fixed cutter 2051 and the movable cutter 2052 are located downstream of the paper feed roller group, and the movable cutter 2052 is located downstream of the fixed cutter 2051.

[0081] The auxiliary cutting assembly includes a fixing pin 2071, a spring 2072 and a spring connecting plate 2073. The spring connecting plate 2073 is connected to the cylinder rod. The fixing pin 2071 is fixed on the main plate 200. The two ends of the spring 2072 are respectively connected to the fixing pin 2071 and the cylinder rod. The pulling direction of the spring 2072 is perpendicular to the extending direction of the cylinder rod. The spring 2072 pulls the movable cutter 2052 upstream to stick to the fixed cutter 2051.

[0082] The cutting cylinder 2053 pushes and pulls the movable cutter 2052 to open and close along the Z axis, and the spring 2072 pulls the cylinder rod toward the negative direction of the Y axis, so that the movable cutter 2052 is close to the fixed cutter 2051 along the negative direction of the Y axis.

[0083] In some embodiments, as Figure 8 As shown, the pneumatic shaft 201 is provided with a paper roll baffle assembly, comprising a fixed baffle 2081 and a movable baffle 2082. The fixed baffle 2081 is fixed to the pneumatic shaft 201 and located near the free end of the pneumatic shaft 201. The movable baffle 2082 is adjustable in its axial position relative to the pneumatic shaft 201. When the axial dimension (width) of the paper roll J changes, the movable baffle 2082 can be moved accordingly.

[0084] The setting of the paper roll baffle group can prevent the paper roll from skewing, inaccurate paper feeding position and paper roll scattering.

[0085] The movable baffle 2082 includes a connecting sleeve portion and a disc portion. The connecting sleeve portion is mounted on the inflatable shaft 201. A flange sleeve is mounted on the connecting sleeve portion. One end of the flange sleeve is fixed on the main plate 200. The connecting sleeve portion and the flange sleeve are connected by adjusting the oblong hole 2083, the circular hole 2084 and the adjusting bolt.

[0086] Optionally, a paper roll end optical fiber sensor may be installed on one of the fixed baffle 2081 and the movable baffle 2082 to remind you to replace the paper roll when the paper roll is exhausted.

[0087] The flange sleeve is provided with an adjustment oblong hole 2083, and the connecting sleeve portion is provided with a round hole, and the adjusting bolt passes through the adjustment oblong hole 2083 and the round hole to fix the flange sleeve and the movable baffle 2082. Of course, the adjustment oblong hole 2083 can also be provided on the connecting sleeve portion, and the round hole is provided on the flange sleeve.

[0088] Auxiliary guide rollers, namely a first auxiliary guide roller 20223 and a second auxiliary guide roller 20224, are also fixed to the main body plate 200. The auxiliary guide rollers are located above the buffer chamber 2021. The first auxiliary guide roller 20223 is located upstream of the buffer chamber 2021 and downstream of the air shaft 201. The second auxiliary guide roller 20224 is located downstream of the buffer chamber 2021 and upstream of the paper feed roller group, and is close to the paper feed roller group.

[0089] like Figure 9 As shown, paper roll J is mounted on pneumatic shaft 201. One end of the liner paper passes sequentially through first auxiliary guide roller 20223, first guide roller 20221, gravity pressure roller 2023, second guide roller 20222, and second auxiliary guide roller 20224. The liner paper then enters the paper feed roller assembly and is driven downstream by first and second pressure rollers 2031 and 2032. During this process, the liner paper wraps around gravity pressure roller 2023. Due to its own weight, gravity pressure roller 2023 moves downward along vertical guide holes 20211, pulling the liner paper downward and driving paper roll J to rotate. This pre-cache a section of liner paper in buffer 221, enabling pre-unwinding. Even as the paper roll becomes less loaded, there is no shortage of paper to feed the paper feed roller assembly. This ensures that paper delivery matches the operating rhythm of the paper feed roller assembly, preventing paper from being delivered incompletely. Furthermore, pre-unwinding and caching a section of liner paper can reduce paper delivery time.

[0090] When the gravity pressure roller 2023 slides to the lower end along the vertical guide, it will be sensed by the proximity switch 2024, and then the proximity switch 2024 will be activated, so that the inflatable shaft 201 stops rotating and unwinding.

[0091] like Figures 10 to 12 The number plate clamping robot assembly shown has a carton clamping mechanism for clamping cartons and a number plate clamping mechanism for clamping number plates installed on the mounting base 300. The carton clamping mechanism includes a carton clamping mechanism driving device and two carton clamps arranged opposite to each other. The carton clamping mechanism drives the two carton clamps to move relative to each other to clamp the carton.

[0092] In some embodiments, the carton gripper driving device includes two cylinders, preferably a dual-axis cylinder.

[0093] The two cylinders are a first cylinder 301 and a second cylinder 302, and the two carton grippers are a first carton gripper 303 and a second carton gripper 304. The first cylinder 301 drives the first carton gripper 303, while the second cylinder 302 drives the second carton gripper 304. The first carton gripper 303 and the second carton gripper 304 move relative to each other simultaneously to clamp the carton. Specifically, when the carton is opened, the first carton gripper 303 and the second carton gripper 304 grasp one cardboard sheet of the carton and then lift the carton.

[0094] The license plate clamp mechanism includes a license plate clamp driving device, two license plate clamps arranged opposite to each other, and a linear guide assembly. In some embodiments, the license plate clamp driving device includes two cylinders, namely the third cylinder 305 and the fourth cylinder 306. The two license plate clamps are respectively the first license plate clamp 307 and the second license plate clamp 308. A linear guide assembly is provided between the license plate clamp and the mounting base plate 300. The license plate clamp driving device drives the two license plate clamps to move relative to each other along the linear guide assembly to clamp the license plate. A liner paper pressing device is fixed on the inner side of the license plate clamp, and the two carton clamps are located between the two license plate clamps. Specifically, the cylinder rod of the third cylinder 305 pulls the first license plate clamp 307, and at the same time, the cylinder rod of the fourth cylinder 306 pulls the second license plate clamp 308. The first license plate clamp 307 and the second license plate clamp 308 move relative to each other at the same time to clamp the license plate.

[0095] In some embodiments, as Figure 10 and Figure 11 As shown, a first avoidance hole 3001 and a second avoidance hole 3002 are provided on the mounting base plate 300 . The first avoidance hole 3001 is used to avoid the movement of the first carton clamp 303 , and the second avoidance hole 3002 is used to avoid the movement of the second carton clamp 304 .

[0096] In some embodiments, as Figure 11 As shown, the carton clamping jaw includes a carton clamping plate 3031 , a rubber pad 3032 is fixed to the clamping side of the carton clamping plate 3031 , and a carton clamping jaw reinforcement rib 3033 is fixed to the non-clamping side of the carton clamping plate 3031 .

[0097] like Figure 11 As shown, there are two clamping arms 30311 at the lower end of the license plate clamp, and the lower end of each clamping arm 30311 is tilted inward to facilitate clamping the license plate and prevent the license plate from slipping after being clamped.

[0098] An observation hole 30312 is provided on the license plate clamp, which can not only observe the clamping situation but also reduce the weight. A reinforcing rib 30313 is fixed on the inner side of the license plate clamp to increase the structural strength of the license plate clamp.

[0099] The backing paper holding device includes a positioning wheel bracket 3091 and a positioning wheel 3092. Positioning wheel bracket 3091 has two mounting arms, each with an oblong mounting hole 30921 at its lower end. The positioning wheel is mounted in these holes. During operation, the license plate gripper simultaneously grasps the license plate and backing paper, while the positioning wheel 3092 presses against them to restrict the backing paper's position and prevent it from sliding, fluttering, or shifting.

[0100] The linear guide rail assembly includes a guide rail 3013 and a slider 3014. The slider 3014 can move along the guide rail 3013. The guide rail 3013 is fixedly connected to the mounting base plate 300, and the slider is fixedly connected to the license plate clamp.

[0101] The license plate gripping robot assembly 3 is installed on the robotic arm. The license plate gripping robot assembly can not only grab the license plate and liner at the same time, but also grip the cardboard box, which can flexibly adapt to more application scenarios.

[0102] The number plate clamping robot assembly 3 is controlled by the robotic arm to press the lining paper onto the number plate and clamp the number plate. At the same time, the movable lining paper clamping claw 4 is released and then moves outward a certain distance so that the movable lining paper clamping claw 4 is completely separated from the lining paper. At this time, the paper cutting mechanism cuts the lining paper to prevent the lining paper from sticking to the movable lining paper clamping claw 4. The number plate clamping robot assembly 3 picks up the number plate and the lining paper and moves them to the top of the carton in the carton placement area G. The number plate clamping robot assembly 3 sinks so that the number plate is completely entered into the carton. The clamping claw is released, and the number plate and the lining paper fall into the carton at the same time.

[0103] The above-mentioned license plate gripping robot assembly can not only grip license plates but also grip cartons. There is no need for manpower to place the cartons in advance, and it can be connected to an automatic carton receiving device to avoid manual handling, greatly improving the degree of automation.

[0104] Mounting base 300 is secured with a support column 3010, a photoelectric switch 3011, and a sensor 3012. The support column 3010 connects to the robotic arm, the sensor 3012 detects whether the license plate gripper is empty, and the photoelectric switch 3011 detects obstacles within the robotic arm's range of motion. For example, if a person enters the robotic arm's range of motion, the photoelectric switch 3011 detects this and the robotic arm stops, preventing injury and damage.

[0105] The above-mentioned license plate gripping robot assembly 3 can automatically grip empty cartons from the carton docking device and place them in the carton placement area G. The empty box straightening mechanism automatically straightens the carton. After the carton is full of license plates, the full box pushing mechanism automatically pushes it to the corresponding docking device, and the docking device removes the full box or delivers an empty box.

[0106] The working process of the automatic number plate packing machine of the present invention is as follows:

[0107] The staff member places paper roll J onto pneumatic shaft 201 and secures it. The liner paper is unwound and passed through the gravity-pressing roller 2023 in the liner paper buffer. The liner paper is then wrapped around the gravity-pressing roller 2023. The pneumatic shaft 201, driven by the first motor 2011, unwinds the liner paper, which is then fed out. The gravity-pressing roller 2023 moves downward along the vertical guide hole 20211 under its own weight, pre-caching a section of liner paper in the buffer 2021. Simultaneously, the carton gripper mechanism grabs the carton and places it in carton storage area G. The empty box straightening mechanism automatically straightens the carton. A QR code reader identifies the QR code on the carton, and the overall control system issues a production order. After the pre-stored section of lining paper passes through the paper feeding and pressing roller group, it protrudes a certain distance from between the fixed cutter 2051 and the movable cutter 2052 of the paper cutting mechanism, and the movable lining paper clamping claw 4 moves to the inner limit position (close to the position of the paper feeding and pressing roller group) to clamp the lining paper. After clamping, the movable lining paper clamping claw 4 moves along the linear guide rail assembly. At this time, the two paper feeding and pressing rollers rotate at the same time to pull the lining paper out to the predetermined position and stand by. The license plate clamping robot assembly 3 hovers a certain distance above the lining paper (the lining paper at this time is in the predetermined position and stand by) through the operation of the robot arm. After the signing machine completes the signing of the license plate, it is conveyed to the license plate conveyor belt of the license plate automatic packing machine of the present invention. When the license plate after signing is conveyed to the license plate limit position by the license plate conveyor belt 5, the license plate after signing will temporarily stay here, and the license plate clamping robot assembly 3 moves downward to the appropriate position, and the license plate clamping mechanism moves and clamps the license plate and the lining paper above it. The movable liner paper gripper then releases the liner paper and moves outward until it is completely separated from it. The paper cutting mechanism then cuts the liner paper. The license plate gripper then grips the license plate and liner paper and lifts them. The robotic arm then operates, placing the gripped license plate and liner paper (after the liner paper has been cut) into the carton in the carton storage area. Once the carton is full of license plates, the full-carton ejection mechanism automatically pushes them onto the corresponding automatic docking device, which then removes the full carton.

[0108] As the license plate clamping mechanism grips the license plate and backing paper and lifts it, when the space below it is sufficient for the backing paper clamping mechanism to move, the paper feed roller assembly and movable backing paper clamping mechanism 4 will repeat the previous paper feeding and pulling action. The paper cutting mechanism will then cut the backing paper, and the license plate clamping mechanism will place the clamped license plate and backing paper into the carton in the carton storage area. As the carton is filled with license plates, the next empty carton is gripped by the carton clamping mechanism and placed in the carton storage area G, and the above license plate and backing paper packing operation will be repeated.

[0109] The number plates on the number plate conveyor belt 5 device usually come from the conveyor belt of the endorsement machine. After the number plate is endorsed by the endorsement machine, it is transported to the number plate conveyor belt 5 of the number plate automatic packing machine by the conveyor belt of the endorsement machine.

[0110] The automatic cartoning machine for number plates of the present invention is provided with a gravity-forced pressure roller so that the lining paper fed between the paper feeding pressure roller group and the paper roll is controlled not to be deformed or wrinkled, and will not cause the paper feeding pressure roller group to squeeze the paper and cause a malfunction. The movable lining paper clamp cooperates to pull the lining paper, ensuring that the length of each lining paper is uniformly controlled and neat. Moreover, since the lining paper can be fed out in advance and wait for the number plate to move, the paper output time is reduced. The number plate clamping robot assembly can not only grab the number plate and lining paper at the same time, but also clamp the cartons. The number plate clamping robot assembly can automatically clamp the empty cartons from the carton docking device and place them in the designated area, and automatically straighten them. The full cartons can be automatically pushed out to the corresponding docking device, and the docking device will remove the full cartons or deliver the empty cartons. There is no need for manpower to put the cartons in place in advance, and they can be docked with the automatic carton docking device, avoiding manual handling and greatly improving the degree of automation.

[0111] After the license plate is output from the conveyor belt of the signing machine, it is perfectly connected to the license plate conveyor belt of the automatic license plate packing machine. The conveying process is fast, the positioning is accurate, and the movement posture is controllable.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A license plate automatic packing machine, comprising a frame, characterized in that: The frame is equipped with a license plate conveyor belt for conveying license plates, an automatic backing paper conveying and cutting assembly for conveying and cutting backing paper, a movable backing paper clamping claw and a license plate clamping manipulator assembly. The movable liner paper clamp is located above the license plate conveyor belt. A linear guide rail assembly is provided between the movable liner paper clamp and the frame. The extension direction of the linear guide rail assembly is parallel to the conveying direction of the license plate conveyor belt. The automatic liner paper conveying and cutting assembly includes a main body plate, on which are mounted an inflatable shaft for placing a paper roll, a paper feeding pressure roller group for feeding paper, and a paper cutting mechanism for cutting paper; a liner paper buffer bin assembly is provided below the inflatable shaft, and the liner paper buffer bin assembly includes a buffer bin, a guide roller, and a gravity pressure roller; the guide roller is installed in the buffer bin, a vertical guide is provided on the bin wall of the buffer bin, the gravity pressure roller is slidably connected to the buffer bin through the vertical guide, and a proximity switch is fixed to the bottom of the buffer bin; when the gravity pressure roller slides to the lower end along the vertical guide, the proximity switch is actuated, so that the inflatable shaft stops rotating and unwinding; The paper feeding pressing roller group includes a first rubber pressing roller and a second rubber pressing roller. The second rubber pressing roller is provided with an oblique protrusion in the middle portion, and the first rubber pressing roller is provided with an oblique depression in the middle portion that matches the oblique protrusion. When the first rubber pressing roller and the second rubber pressing roller are in contact with each other, the oblique protrusion and the oblique depression cooperate to press out an anti-curling vertical groove in the middle portion of the passing liner paper to prevent the liner paper from curling. The number plate clamping robot assembly includes a carton clamping mechanism for clamping cartons and a number plate clamping mechanism for clamping number plates and lining paper. The carton clamping mechanism clamps the carton and places it in the carton placement area. The number plate clamping robot assembly includes a mounting base plate, and the carton clamping mechanism and the number plate clamping mechanism are mounted on the mounting base plate. The backing paper cached in the buffer bin is fed a certain distance by the paper feeding roller group, and the movable backing paper clamp moves close to the paper feeding roller group to clamp the backing paper. The paper feeding roller group and the movable backing paper clamp operate simultaneously to pull the backing paper to a predetermined position for standby. When the license plate after the signing is completed is transported to the license plate limit position by the license plate conveyor belt, the license plate clamping mechanism moves and clamps the license plate and the lining paper above it, and then the movable lining paper clamp releases the lining paper and moves outward until it is separated from the lining paper, the paper cutting mechanism cuts the lining paper, and the license plate clamping mechanism places the clamped license plate and the lining paper into the carton at the carton placement area.

2. The automatic license plate packing machine according to claim 1, characterized in that: The movable paper clamp is mounted on a clamp bracket. The movable paper clamp comprises a clamp power device, an upper clamp and a lower clamp. The clamp power device drives the upper clamp to move closer to or away from the lower clamp to clamp or release the paper. The linear guide rail assembly includes a guide rail and a slider. The slider can move along the guide rail. The guide rail is fixed on the frame. The guide rail is arranged parallel to the license plate conveyor belt. The clamping claw bracket is fixedly connected to the slider.

3. The automatic license plate packing machine according to claim 2, characterized in that: An empty box straightening mechanism and a full box pushing mechanism are provided at the carton placement area, the empty box straightening mechanism comprises a carton placement bottom plate fixed to the frame, a side plate perpendicular to and fixed to the carton placement bottom plate, a movable straightening plate, a liftable straightening plate and a movable straightening arm, the movable straightening plate is opposite to the side plate, the carton placement bottom plate is provided with a straightening plate avoidance hole for the liftable straightening plate to pass through, a first power device drives the liftable straightening plate to extend out of the carton placement bottom plate or retract, the liftable straightening plate is opposite to the movable straightening arm, a second power device drives the movable straightening plate to approach or move away from the side plate, and a third power device drives the movable straightening arm to approach or move away from the liftable straightening plate; The full box ejection mechanism includes an ejection plate and a carton ejection power device. The ejection plate is provided with a straightening arm avoidance hole for the movable straightening arm to pass through. The carton ejection power device pushes the ejection plate to extend or retract.

4. The automatic license plate packing machine according to claim 3, characterized in that: The vertical guide member is a vertical long guide hole, and the vertical long guide hole is opened on two opposite warehouse walls of the cache warehouse.

5. The automatic license plate packing machine according to claim 4, characterized in that: The first rubber pressure roller is slidably connected to the main body plate, the second rubber pressure roller is rotatably installed on the main body plate, the first power device pushes the first rubber pressure roller against the second rubber pressure roller, and the second power device drives the second rubber pressure roller to rotate.

6. The automatic license plate packing machine according to claim 5, characterized in that: The paper cutting mechanism is located below the inflatable shaft and above the buffer bin. The paper cutting mechanism includes a fixed cutter and a movable cutter. One end of the movable cutter is hinged to the fixed cutter, and the other end of the movable cutter is connected to a cutting cylinder. The cutting cylinder drives the movable cutter to open and close relative to the fixed cutter to perform cutting. An auxiliary cutting component is provided on the main body panel. During cutting, the auxiliary cutting component pulls the movable cutter against the fixed cutter. The direction in which the auxiliary cutting component pulls the movable cutter is perpendicular to the direction in which the cutting cylinder drives the movable cutter.

7. The automatic license plate packing machine according to claim 6, characterized in that: The cutting cylinder includes a cylinder rod, and the other end of the movable cutter is connected to the cylinder rod through a floating joint. Assume that the liner paper is conveyed from upstream to downstream, the fixed cutter and the movable cutter are located downstream of the paper feeding roller group, and the movable cutter is located downstream of the fixed cutter. The auxiliary cutting assembly includes a fixing pin, a spring and a spring connecting plate, the spring connecting plate is connected to the cylinder rod, the fixing pin is fixed to the main body plate, the two ends of the spring are respectively connected to the fixing pin and the cylinder rod, the pulling direction of the spring is perpendicular to the extending direction of the cylinder rod, and the spring pulls the movable cutter upstream to abut against the fixed cutter.

8. The automatic license plate packing machine according to claim 1, characterized in that: The carton clamping mechanism includes a carton clamping jaw driving device and two carton clamping jaws arranged opposite to each other. The carton clamping jaw driving device drives the two carton clamping jaws to move relative to each other to clamp the carton. The number plate clamping mechanism includes a number plate clamping jaw driving device, two number plate clamping jaws arranged opposite to each other and a linear guide rail assembly. The linear guide rail assembly is arranged between the number plate clamping jaw and the mounting base plate. The number plate clamping jaw driving device drives the two number plate clamping jaws to move relative to each other along the linear guide rail assembly to clamp the number plate. A lining paper pressing device is fixed on the inner side of the number plate clamping jaw, and the two carton clamping jaws are located between the two number plate clamping jaws.

9. The automatic license plate packing machine according to claim 8, characterized in that: The carton clamp driving device includes two cylinders, the two cylinders are respectively a first cylinder and a second cylinder, the two carton clamps are respectively a first carton clamp and a second carton clamp, the first cylinder drives the first carton clamp, and the second cylinder drives the second carton clamp, and the first carton clamp and the second carton clamp move relative to each other simultaneously to clamp the carton; The mounting base plate is provided with a first avoidance hole and a second avoidance hole. The first avoidance hole is used to avoid the movement of the first carton clamping jaw, and the second avoidance hole is used to avoid the movement of the second carton clamping jaw.

10. The automatic license plate packing machine according to claim 8, characterized in that: The license plate clamp driving device includes two cylinders, the two cylinders are the third cylinder and the fourth cylinder respectively, and the two license plate clamps are the first license plate clamp and the second license plate clamp respectively. The third cylinder drives the first license plate clamp, and at the same time, the fourth cylinder drives the second license plate clamp. The first license plate clamp and the second license plate clamp move relative to each other at the same time to clamp the license plate.

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