Carton printing and conveying device for agricultural product packaging and process of carton printing and conveying device

Abstract

The invention relates to the technical field of carton conveying devices, in particular to a carton printing and conveying device for agricultural product packaging and a process of the carton printing and conveying device. The conveying mechanism comprises an adjusting assembly connected to the conveying frame, the output end of the adjusting assembly is connected with two driving frames and used for adjusting the distance between the two driving frames, and the two driving frames are both located above the electric rollers. By arranging the conveying mechanism, the cover sealing mechanism and the printing mechanism, the conveying mechanism conveys a carton, cooperates with the cover sealing mechanism to complete cover sealing operation of the carton, and cooperates with the stirring assembly to complete stirring, overturning and rotating of the carton, so that the printing device can conveniently print the end face, needing to be printed, of the carton, and the printing efficiency is improved. Operations of carton sealing, reversing, printing of different end faces and conveying are completed, and the packaging and conveying efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carton conveying device, and particularly relates to a carton printing conveying device for agricultural product packaging and a process thereof. BACKGROUND

[0002] The carton conveying device is commonly used in a flow line of carton packaging products. The carton packaging is the most widely used packaging method, which is easy to obtain, light in weight, easy to print and low in cost. In the flow line of carton packaging, a covering mechanism is usually provided to perform covering operation on the top of the carton, a turning mechanism is used to turn the carton during conveying, and a printing device is used to print the surface of the carton. The processes are relatively independent, the working hours are long, and the packaging conveying efficiency is reduced.

[0003] In the prior art, a conveying belt is used to convey the carton, and a printing device is used to print the carton during conveying. In this way, the sealing, turning, printing of different end faces and conveying operations of the carton cannot be quickly completed. Two plates with adjustable spacing are used to limit the carton during conveying to adjust the position of the carton, and a liftable blocking frame is used to block the subsequent carton to prevent the carton from piling up. In this way, the conveying device cannot drive the carton to rotate while conveying the carton, and the packaging conveying efficiency is reduced. SUMMARY

[0004] The present application aims at solving the problem of the prior art that the sealing, turning, printing of different end faces and conveying operations of the carton cannot be quickly completed, and provides a carton printing conveying device for agricultural product packaging and a process thereof.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: A carton printing conveying device for agricultural product packaging, comprising a conveying frame, further comprising: A plurality of electric rollers are rotatably mounted on the conveying frame. A conveying mechanism, the conveying mechanism comprises an adjusting assembly connected to the conveying frame, the output end of the adjusting assembly is connected with two drive frames, and the adjusting assembly is used to adjust the spacing of the two drive frames, the two drive frames are located above the electric rollers, and the two drive frames are provided with a conveying belt on the opposite side. A covering mechanism, the covering mechanism comprises a mounting plate liftable connected to the conveying frame, the mounting plate is located above the conveying mechanism, and one side of the mounting plate is connected with a folding cover assembly and the other side of the mounting plate is provided with a sealing machine. The printing mechanism comprises a fixed plate which is connected to the conveying frame in a liftable manner, a printing device is installed on the fixed plate, the printing device is located above the conveying mechanism and is used for printing on the top of the passing carton, and the printing mechanism further comprises a poking assembly which is used for poking the carton to rotate in cooperation with the conveying mechanism.

[0006] Preferably, the adjusting assembly comprises two driving motors which are installed on the conveying frame, driving rods are connected to the output ends of the driving motors, two moving blocks are threadedly connected to the driving rods, the thread connection parts of the two moving blocks on the driving rods have equal pitches and opposite screw directions, and the driving frames are fixedly connected to the two moving blocks on the same side through supporting rods.

[0007] Preferably, the output ends of the driving motors are coaxially and fixedly connected to the driving rods through clutches, second gears are coaxially and fixedly connected to the ends of the driving rods which are away from the driving motors, and the same transmission chain is sleeved with the two second gears.

[0008] Preferably, control motors are installed at the bottoms of the two driving frames, and the output ends of the two control motors are coaxially and fixedly connected to the conveying ends of the two conveying belts one by one.

[0009] Preferably, protective frames are fixedly connected to the two sides of the conveying frame, sliding rods are rotatably connected in the protective frames, adjusting rods are fixedly connected to the top ends of the sliding rods, sliding frames are threadedly connected to the middle parts of the sliding rods, first gears are coaxially and fixedly connected to the bottom ends of the sliding rods, the sliding frames are slidably connected to the protective frames, transmission devices are connected between the two first gears, and the mounting plates are fixedly connected to the two sliding frames.

[0010] Preferably, the cover folding assembly comprises a mounting frame which is fixedly connected to the mounting plate, an electric push rod is rotatably installed at the top of the mounting frame, a triangular bracket is rotatably connected to the output end of the electric push rod, the middle part of the triangular bracket is rotatably connected to the top of the mounting frame through a support, and when the triangular bracket rotates, the end of the triangular bracket which is away from the electric push rod pushes the rear cover of the carton to rotate. A push plate is fixedly connected to the bottom of the mounting frame, and the push plate pushes the front cover of the carton to rotate when the carton moves. Two first rotating rods are rotatably connected to the mounting plate, the two first rotating rods are expanded in a horn shape in the initial state, and the two first rotating rods push the two side covers of the carton to rotate when the two first rotating rods rotate and combine.

[0011] Preferably, the sealing machine is located between the cover folding assembly and the printing mechanism and is used for sealing the carton with the four covers combined.

[0012] Preferably, a plurality of telescopic frames are installed at the bottom of the fixed plate, and bottom plates are fixedly connected to the bottom ends of the telescopic frames. The toggle assembly comprises a second rotating rod rotatably connected to the driving frame, and two third rotating rods rotatably connected to the fixed plate, and the two third rotating rods and the second rotating rod are located on the moving paths of the upper half and the lower half of the carton respectively after rotation.

[0013] Preferably, the transport frame is fixedly connected with protective windows on both sides, and the transport mechanism, the covering mechanism and the printing mechanism are located between the two protective windows.

[0014] The paper box printing and conveying process for agricultural product packaging comprises the paper box printing and conveying device for agricultural product packaging and the following steps. S1: device adjustment: adjusting the distance between the two conveying belts in the transport mechanism according to the width of the carton, and adjusting the covering mechanism and the printing mechanism according to the height of the carton; S2: conveying operation: the transport mechanism conveys the carton between the two conveying belts through the opposite movement of the two conveying belts; S3: covering operation: the folding cover assembly folds the four cover pieces of the carton in cooperation with the transport mechanism, and then the sealing machine seals the top of the carton; S4: direction adjusting operation: the toggle assembly toggles the carton to rotate, and the transport mechanism controls the two conveying belts to move in the same direction and increase the distance between them to drive the carton to rotate, so that the end face of the carton that needs to be printed faces upward; S5: printing operation: the printing device prints the current top of the carton.

[0015] Compared with the prior art, the paper box printing and conveying process for agricultural product packaging has the following advantages: 1: The transport mechanism, the covering mechanism and the printing mechanism are arranged, the transport mechanism conveys the carton, the covering mechanism completes the covering operation of the carton, and the toggle assembly completes the toggling and rotating of the carton, so that the printing device can print the end face of the carton that needs to be printed, the sealing, direction adjusting, printing of different end faces and conveying operations of the carton are completed, and the packaging conveying efficiency is improved.

[0016] 2: The toggle assembly and the rotatable electric rollers are arranged, the electric rollers assist the transport mechanism to convey the carton when not working, and when the toggle assembly toggles the carton to rotate, the two electric rollers abutting against the bottom corners of the carton are controlled to rotate in opposite directions, so that the corners of the carton between the two electric rollers are toggled upward, the carton corners are effectively prevented from being squeezed and damaged when moving, the packaging quality and appearance of the carton are improved, and the agricultural products in the carton are protected. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 An overall axial structure schematic diagram of a carton printing conveying device for agricultural product packaging is provided.

[0018] Figure 2 A protective window and adjusting rod structure schematic diagram of a carton printing conveying device for agricultural product packaging is provided.

[0019] Figure 3 A driving frame and conveying belt structure schematic diagram of a carton printing conveying device for agricultural product packaging is provided.

[0020] Figure 4 A transport frame and electric roller structure schematic diagram of a carton printing conveying device for agricultural product packaging is provided.

[0021] Figure 5 A sealing mechanism schematic diagram of a carton printing conveying device for agricultural product packaging is provided.

[0022] Figure 6 A folding cover assembly schematic diagram of a carton printing conveying device for agricultural product packaging is provided.

[0023] Figure 7 A transport mechanism schematic diagram of a carton printing conveying device for agricultural product packaging is provided.

[0024] In the figure: 1, transport frame; 2, electric roller; 3, bottom plate; 4, telescopic frame; 5, protective window; 6, adjusting rod; 7, protective frame; 8, sliding rod; 9, sliding frame; 10, first gear; 11, electric push rod; 12, triangular bracket; 13, mounting frame; 14, push plate; 15, mounting plate; 16, first rotating rod; 17, driving frame; 18, conveying belt; 19, control motor; 20, moving block; 21, second gear; 22, transmission chain; 23, second rotating rod; 24, driving motor; 25, driving rod; 26, transmission device; 27, sealing machine; 28, printing device; 29, third rotating rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0026] REFERENCE Figures 1-7 A carton printing conveying device for agricultural product packaging, comprising a transport frame 1, further comprising: Electric rollers 2, a plurality of electric rollers 2 are rotatably installed on the transport frame 1.

[0027] The plurality of electric rollers 2 all adopt prior art, and the electric rollers 2 are not actively rotated in the initial state, and only remain rotatable, facilitating the subsequent transportation mechanism to transport the cartons placed thereon.

[0028] The transportation mechanism comprises an adjusting assembly connected to the transportation frame 1, the output end of the adjusting assembly is connected with two drive frames 17, and the adjusting assembly is used for adjusting the interval of the two drive frames 17, the two drive frames 17 are both located above the electric rollers 2, and the two drive frames 17 are both provided with a conveying belt 18 on the opposite side.

[0029] The adjusting assembly comprises two drive motors 24 mounted on the transportation frame 1, the output end of the drive motor 24 is connected with a drive rod 25, the drive rod 25 is threadedly connected with two moving blocks 20, the thread pitch of the threaded connection part of the drive rod 25 where the two moving blocks 20 are located is equal, and the screw directions are opposite, and the drive frame 17 is fixedly connected to the two moving blocks 20 on the same side through a support rod.

[0030] When the drive rod 25 rotates, the two moving blocks 20 are driven to move close to or away from each other through the threads with equal thread pitch and opposite screw directions, so that the interval of the two drive frames 17 is conveniently adjusted.

[0031] The output end of the drive motor 24 is coaxially and fixedly connected with the drive rod 25 through a clutch, the end, away from the drive motor 24, of the drive rod 25 is coaxially and fixedly connected with a second gear 21, and the two second gears 21 are sleeved with a same transmission chain 22.

[0032] The clutch adopts prior art, and is used for controlling whether the output end of the drive motor 24 is linked with the drive rod 25 or not, through the two drive motors 24 and the gears and the chain, when one of the drive motors 24 fails, the other drive motor 24 can work, the two drive rods 25 are synchronously moved through the second gears 21 and the transmission chain 22, and the interval of the two drive frames 17 can still be stably adjusted.

[0033] The bottom of each of the two drive frames 17 is provided with a control motor 19, and the output end of each of the two control motors 19 is coaxially and fixedly connected with the conveying end of one of the two conveying belts 18.

[0034] The two control motors 19 all adopt prior art, and the output end of each of the two control motors 19 can control the rotating direction and the rotating speed, so as to conveniently control the movement state of the two conveying belts 18, so as to perform conveying and rotating operations on the cartons between the two conveying belts 18.

[0035] The covering mechanism comprises a mounting plate 15 which is connected to the transportation frame 1 in a liftable manner, the mounting plate 15 is located above the transportation mechanism, one side of the mounting plate 15 is connected with a cover folding assembly, and the other side of the mounting plate 15 is provided with a sealing machine 27.

[0036] The transport frame 1 is fixedly connected with a protective frame 7 on both sides, the inside of the protective frame 7 is rotatably connected with a sliding rod 8, the top end of the sliding rod 8 is fixedly connected with an adjusting rod 6, the middle part is threadedly connected with a sliding frame 9, and the bottom end is coaxially fixedly connected with a first gear 10, the sliding frame 9 is slidably connected on the protective frame 7, and the two first gears 10 are connected with a transmission device 26, and the mounting plate 15 is fixedly connected on the two sliding frames 9.

[0037] The transmission device 26 adopts the prior art, so that the two first gears 10 keep synchronous motion in the same direction, when the sliding rod 8 is rotated through an adjusting rod 6, the other sliding rod 8 is synchronously rotated, the two sliding frames 9 are synchronously moved up and down, and the height adjustment of the mounting plate 15 is completed.

[0038] The folding cover assembly comprises a mounting frame 13 fixedly connected on the mounting plate 15, the top of the mounting frame 13 is rotatably provided with an electric push rod 11, the output end of the electric push rod 11 is rotatably connected with a triangular bracket 12, the middle part of the triangular bracket 12 is rotatably connected on the top of the mounting frame 13 through a support, and when the triangular bracket 12 rotates, the end away from the electric push rod 11 pushes the rear cover piece of the carton to rotate.

[0039] The bottom of the mounting frame 13 is fixedly connected with a push plate 14, and the push plate 14 pushes the front cover piece of the carton to rotate when the carton moves.

[0040] The mounting plate 15 is rotatably connected with two first rotating rods 16, the two first rotating rods 16 are initially expanded in a horn shape, and the two first rotating rods 16 push the two side cover pieces of the carton to rotate when they are rotated and combined.

[0041] The sealing machine 27 is located between the folding cover assembly and the printing mechanism, and the sealing machine 27 adopts the prior art and is used for sealing the carton with four cover pieces.

[0042] The printing mechanism comprises a fixed plate which is connected to the transport frame 1 in a lifting manner, and a printing device 28 is installed on the fixed plate, the printing device 28 is located above the transport mechanism and is used for printing the top of the passing carton, and the printing mechanism further comprises a poking assembly which is used for poking the carton to rotate in cooperation with the transport mechanism.

[0043] The printing device 28 adopts the prior art and is used for printing the top of the carton.

[0044] A plurality of telescopic supports 4 are installed on the bottom of the fixed plate, and the bottom ends of the plurality of telescopic supports 4 are fixedly connected with a bottom plate 3.

[0045] The telescopic support 4 adopts the existing electric telescopic structure, so that the height of the fixed plate can be conveniently controlled.

[0046] The toggle assembly comprises a second rotating rod 23 rotatably connected to the driving frame 17, and two third rotating rods 29 rotatably connected to the fixed plate, and the two third rotating rods 29 and the second rotating rod 23 are located on the moving paths of the upper half and the lower half of the carton respectively after being rotated.

[0047] The transport frame 1 is fixedly connected with protective windows 5 on both sides, and the transport mechanism, the covering mechanism and the printing mechanism are located between the two protective windows 5.

[0048] The components on the transport frame 1 are protected through the protective windows 5.

[0049] In use, first, the initial interval of the two driving frames 17 is determined according to the width of the carton, the driving motor 24 is started, the output end of the driving motor 24 drives the driving rod 25 to rotate, the driving rod 25 drives the two moving blocks 20 to move close to or away from each other, so as to control the two driving frames 17 to move close to or away from each other, adjust the interval between the two driving frames 17, adapt to the width of the carton, and facilitate the carton to be conveyed by the conveying belt 18 on the driving frame 17.

[0050] Then, the height of the fixed plate and the mounting plate 15 is determined according to the height of the carton, and the height of the fixed plate is adjusted so that the telescopic frame 4 directly controls the height of the fixed plate through the height adjustment of the telescopic frame 4, thereby adjusting the height of the printing device 28 to ensure that the printing device 28 can print on the top of the carton.

[0051] When the height of the mounting plate 15 is adjusted, the sliding rod 8 in the protective frame 7 is rotated by rotating the adjusting rod 6, the sliding rod 8 drives the other sliding rod 8 to rotate synchronously through the first gear 10, the transmission device 26 and the other first gear 10, so that the two sliding frames 9 are displaced synchronously upward and downward, thereby controlling the height of the mounting plate 15 and facilitating the covering mechanism on the mounting plate 15 to accurately operate the carton.

[0052] After the device is adjusted, the carton to be covered is placed between the two conveying belts 18, the electric roller 2 is in an initial state of not working and only freely rotating, the two control motors 19 are started, the two conveying belts 18 are controlled to move synchronously and in opposite directions, so that the moving directions of the two conveying belts 18 are the same as the contact surface of the carton, the carton is driven to move forward through the friction between the conveying belt 18 and the two sides of the carton, and the carton is conveyed.

[0053] Before the carton moves close to the folding cover assembly, the electric push rod 11 is started, the output end of the electric push rod 11 is retracted, the triangular bracket 12 is pulled, and the working end of the triangular bracket 12 is lifted to avoid hindering the carton.

[0054] When the carton moves under the cover folding assembly, the front cover of the carton first contacts the push plate 14 and rotates backward along the arc-shaped surface of the push plate 14; the output end of the electric push rod 11 is elongated to push the triangular bracket 12, and the working end of the triangular bracket 12 rotates downward to push the rear cover of the carton to rotate forward; when the carton continues to move, the two first rotating rods 16 rotate and merge to push the two side covers of the carton to rotate toward the middle, thereby completing the cover folding operation of the top of the carton; the top of the carton in the folded state enters the sealing machine 27, the sealing machine 27 seals and fixes the top of the carton, thereby completing the cover sealing operation of the carton and the packaging of the agricultural products.

[0055] Next, the placement posture of the carton is adjusted according to the position required to be printed on the printed label. The front end face is the front end face of the carton before moving, and the rear end face is the rear end face after moving.

[0056] When the front end face of the carton needs to be printed, the two third rotating rods 29 rotate and merge to block the moving path of the upper half of the carton; after the movement of the carton is blocked by the two third rotating rods 29, the carton rotates and tilts backward, and the bottom of the rear end face of the carton falls into the gap between the two adjacent electric rollers 2; at this time, the two electric rollers 2 are controlled to rotate in opposite directions by the external vision device and the controller, the corner of the carton between the two electric rollers 2 is pushed upward, which effectively avoids the damage of the corner of the carton to the electric rollers 2 during movement, until the front end face of the carton is rotated to the top after the carton rotates and tilts backward, thereby facilitating the printing of the printing device 28.

[0057] When the carton rotates and tilts backward, the two second rotating rods 23 change from the merged state to the open state, and the two second rotating rods 23 are supported on the rear end face of the carton to slowly rotate and tilt the carton.

[0058] When the rear end face of the carton needs to be printed, the two second rotating rods 23 first rotate and merge to block the moving path of the lower half of the carton; after the movement of the carton is blocked by the two second rotating rods 23, the carton rotates and tilts forward, and the bottom of the front end face of the carton falls into the gap between the two adjacent electric rollers 2; similarly, the two corresponding electric rollers 2 are controlled to rotate in opposite directions, the corner of the carton between the two electric rollers 2 is pushed upward, until the rear end face of the carton is rotated to the top after the carton rotates and tilts forward, thereby facilitating the printing of the printing device 28.

[0059] When the side end face of the carton needs to be printed, the carton needs to be rotated at this time; by controlling the two transmission belts 18 to move in the same direction synchronously through the two control motors 19, the moving direction of the contact surface between the two transmission belts 18 and the carton is opposite, the carton has a rotating trend through the friction between the two transmission belts 18 and the two sides of the carton, and the two driving frames 17 are controlled to increase the distance between them by driving the motor 24, so that the carton rotates 90°.

[0060] Then the paper box is flipped by the poking assembly, and the printing device 28 can print the side end face of the paper box.

[0061] After the printing of the paper box is completed, the two conveyors 18 are reset, and the paper box can be continuously conveyed.

[0062] The paper box printing and conveying process for agricultural product packaging comprises the paper box printing and conveying device for agricultural product packaging and the following steps. S1: device adjustment: the distance between the two conveyors (18) in the conveying mechanism is adjusted according to the width of the paper box, and the cover folding mechanism and the printing mechanism are adjusted according to the height of the paper box.

[0063] S2: conveying operation: the conveying mechanism conveys the paper box between the two conveyors 18 through the opposite movement of the two conveyors 18.

[0064] S3: cover folding operation: the cover folding assembly cooperates with the conveying mechanism to fold and gather the four cover flaps of the paper box, and the sealing machine 27 then seals the top of the paper box.

[0065] S4: direction changing operation: the poking assembly pokes the paper box to make it rotate, and the conveying mechanism controls the two conveyors 18 to move in the same direction and increase the distance between them to drive the paper box to rotate, so that the end face of the paper box that needs to be printed faces upward.

[0066] S5: printing operation: the printing device 28 prints the current top of the paper box.

[0067] The sealing, direction changing, printing and conveying of the paper box are completed, and the degree of functional integration is high, and the effect is good.

[0068] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A carton printing conveyor for the packaging of agricultural products, comprising a transport frame (1), characterized in that, Also include: Electric roller (2), a plurality of said electric roller (2) is rotatably mounted on the transport frame (1); Transport mechanism, the transport mechanism includes the adjusting assembly connected on the transport frame (1), the output end of the adjusting assembly is connected with two drive frames (17), and the interval of the two drive frames (17) is adjusted, the two drive frames (17) are located above the electric roller (2), and the transmission belt (18) is mounted on the opposite side of the two drive frames (17); Cover mechanism, the cover mechanism includes the mounting plate (15) that is liftablely connected on the transport frame (1), the mounting plate (15) is located above the transport mechanism, and one side is connected with the folding cover assembly, and the other side is provided with sealing machine (27); Printing mechanism, the printing mechanism includes the fixed plate that is liftablely connected on the transport frame (1), the printing device (28) is installed on the fixed plate, the printing device (28) is located above the transport mechanism, for printing the top of the passing carton, the printing mechanism further includes the dialing assembly, and the dialing assembly is used for dialing the carton to rotate in cooperation with the transport mechanism.

2. The carton printing conveyor for produce packaging of claim 1, wherein, The adjusting assembly includes two drive motors (24) mounted on the transport frame (1), the drive motor (24) is connected with the drive rod (25) on the output end, the drive rod (25) is screw connected with two moving blocks (20), the thread pitch of the screw connection part of the drive rod (25) where the two moving blocks (20) are located is equal, and the screw direction is opposite, the drive frame (17) is fixedly connected on the two moving blocks (20) on the same side through the support rod.

3. The carton printing conveyor for produce packaging of claim 2, wherein, The output end of the drive motor (24) is coaxially fixedly connected with the drive rod (25) through the clutch, the second gear (21) is coaxially fixedly connected with the end of the drive rod (25) away from the drive motor (24), and the same transmission chain (22) is sleeved with the two second gears (21).

4. The carton printing conveyor for produce packaging of claim 3, wherein, The bottom of the two drive frames (17) is provided with a control motor (19), and the output end of the two control motors (19) is coaxially fixedly connected with the conveying end of the two transmission belts (18) one by one.

5. The carton printing conveyor for produce packaging of claim 4, wherein, The transport frame (1) is fixedly connected with the protective frame (7) on both sides, the inside of the protective frame (7) is rotatably connected with the sliding rod (8), the top end of the sliding rod (8) is fixedly connected with the adjusting rod (6), the middle part is screw connected with the sliding frame (9), and the bottom end is coaxially fixedly connected with the first gear (10), the sliding frame (9) is slidingly connected on the protective frame (7), the transmission device (26) is connected between the two first gears (10), and the mounting plate (15) is fixedly connected on the two sliding frames (9).

6. The carton printing conveyor for produce packaging of claim 5, wherein, The folding cover assembly comprises a mounting frame (13) fixedly connected to the mounting plate (15), a motor-driven push rod (11) rotatably mounted on the top of the mounting frame (13), and a triangular bracket (12) rotatably connected to the output end of the motor-driven push rod (11); the middle part of the triangular bracket (12) is rotatably connected to the top of the mounting frame (13) through a support; when the triangular bracket (12) rotates, the end thereof away from the motor-driven push rod (11) pushes the rear cover of the carton to rotate. The bottom of the mounting frame (13) is fixedly connected with a push plate (14), which pushes the front cover of the carton to rotate when the carton moves. The mounting plate (15) is rotatably connected with two first rotating rods (16), which are initially spread in a horn shape; when the two first rotating rods (16) rotate and merge, they push the two side covers of the carton to rotate.

7. The carton printing conveyor for produce packaging of claim 6, wherein, The sealing machine (27) is located between the folding cover assembly and the printing mechanism, and is used for sealing the carton with the four covers folded.

8. The carton printing conveyor for produce packaging of claim 7, wherein, The bottom of the fixing plate is provided with a plurality of telescopic supports (4), and the bottom end of each telescopic support (4) is fixedly connected with a bottom plate (3). The poking assembly comprises a second rotating rod (23) rotatably connected to the driving frame (17) and two third rotating rods (29) rotatably connected to the fixing plate; after the second rotating rod (23) and the two third rotating rods (29) rotate, they are located on the moving path of the upper half and the lower half of the carton, respectively.

9. The carton printing conveyor for produce packaging of claim 8, wherein, The transportation frame (1) is fixedly connected with protective windows (5) on both sides, and the transportation mechanism, the sealing mechanism and the printing mechanism are located between the two protective windows (5).

10. A carton printing and conveying process for agricultural product packaging, characterized by, The paper box printing and conveying device for agricultural product packaging comprises the folding cover assembly, the transportation mechanism, the sealing mechanism, the printing mechanism and the poking assembly. S1: device adjustment: adjusting the distance between the two conveying belts (18) in the transportation mechanism according to the width of the carton, and adjusting the sealing mechanism and the printing mechanism according to the height of the carton; S2: conveying operation: the transportation mechanism conveys the carton between the two conveying belts (18) through the opposite movement of the two conveying belts (18); S3: sealing operation: the folding cover assembly folds the four covers of the carton in cooperation with the transportation mechanism, and the sealing machine (27) then seals the top of the carton; S4: direction adjusting operation: the poking assembly pokes the carton to make it rotate, and the transportation mechanism controls the two conveying belts (18) to move in the same direction and increase the distance to drive the carton to rotate, so that the end face of the carton to be printed faces upward; S5: printing operation: the printing device (28) prints the current top of the carton.

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