A self-adjusting ink-jet conveyor for carton production

Abstract

This invention discloses a self-adjusting inkjet printing conveyor for cardboard box production, comprising a belt conveyor with an inkjet printer mounting station at the top, and a negative pressure adsorption mechanism. Before inkjet printing, the negative pressure adsorption mechanism adsorbs and fixes the lower end of the moving cardboard, causing the cardboard to press against the conveyor belt. After inkjet printing, the vacuum adsorption on the cardboard is automatically released. The negative pressure self-adjusting mechanism adapts to the running speed of the conveyor belt, changing the magnitude of the negative pressure adsorbing the cardboard. The speed is directly proportional to the magnitude of the negative pressure. By adsorbing and fixing the back of the cardboard with negative pressure, the stability of the cardboard during operation is ensured, providing a basis for subsequent accurate inkjet printing, and effectively avoiding problems such as scratching the printing ink and damaging the appearance of the cardboard. Simultaneously, the negative pressure self-adjusting mechanism automatically adjusts the magnitude of the generated negative pressure according to the running speed of the conveyor belt to ensure stable operation of the cardboard.

Description

Technical Field

[0001] This invention relates to the field of cardboard box production technology, and in particular to a self-adjusting inkjet printer conveyor for cardboard box production. Background Technology

[0002] In the industrial production process of corrugated boxes, inkjet printing is an indispensable key process used to print variable information such as production date, production batch, product specifications, traceability QR codes, and anti-counterfeiting codes on the surface of the cardboard. To ensure the stability of the inkjet printing process, existing technologies generally use pressure rollers or plates above the conveyor belt at the inkjet printing station to fix the cardboard. The working principle is that the pressure rollers or plates apply downward pressure to the upper end of the cardboard, making the cardboard stick tightly to the surface of the conveyor belt, thereby limiting the vertical jumping and displacement of the cardboard during the conveying process.

[0003] When pressure rollers or plates are used to press against the surface of cardboard, the printing ink will be scratched and the product appearance will be damaged. To address this issue, our company has installed multiple sets of negative pressure adsorption mechanisms on the back of the cardboard (which operate synchronously with the conveyor belt carrying the cardboard). These mechanisms are installed on the chain conveyor and perform negative pressure adsorption and fixation on the back of the cardboard before coding. This ensures the stability of the cardboard during operation, providing a foundation for accurate coding, and effectively avoids scratching the printing ink and damaging the appearance of the cardboard.

[0004] However, the above design has a problem in practical application. Since the maximum negative pressure generated by the weight of the heavy object remains unchanged, it is impossible to adjust the negative pressure according to the speed change when the conveyor belt speed increases, so as to achieve strong adsorption of the cardboard. As a result, it is impossible to avoid the phenomenon of the cardboard jumping up and down and shifting when running at high speed. Therefore, this application provides a self-adjusting inkjet conveyor for carton production to meet the requirements. Summary of the Invention

[0005] The purpose of this application is to provide a self-adjusting inkjet conveyor for carton production, which solves the technical problem that existing conveyor belts cannot adapt to the adjustment of negative pressure when running at high speed, causing the cardboard to jump up and down and shift.

[0006] To achieve the above objectives, this application provides the following technical solution: a self-adjusting inkjet conveyor for carton production, including a belt conveyor with an inkjet printer mounting station at the upper end, and a negative pressure adsorption mechanism. Before inkjet printing, the negative pressure adsorption mechanism adsorbs and fixes the lower end of the moving cardboard, so that the cardboard is squeezed against the conveyor belt of the belt conveyor. After inkjet printing is completed, the vacuum adsorption on the cardboard is automatically released.

[0007] The negative pressure self-adjusting mechanism adapts to the running speed of the conveyor belt, changing the magnitude of the negative pressure that attracts the cardboard. The speed is directly proportional to the magnitude of the negative pressure.

[0008] As a preferred embodiment of this example, the belt conveyor includes a support base frame with a drive shaft and a driven shaft rotatably mounted on its upper end, as well as a support plate and a guide rod disposed opposite to each other on the support base frame;

[0009] The drive shaft is driven by a drive motor mounted on the support base. Two sets of mounting cylinders are respectively arranged opposite to each other on the drive shaft and the driven shaft. The two sets of conveyor belts are respectively mounted on the two sets of mounting cylinders. The support plate is located in the inner cavity of the conveyor belt.

[0010] Limiting rings are respectively installed on the two sets of mounting cylinders and on both sides of the conveyor belt;

[0011] A accommodating gap is provided between the two sets of conveyor belts;

[0012] The negative pressure adsorption mechanism includes a chain plate conveyor that moves synchronously with the conveyor belt. Each chain plate on the chain plate conveyor is provided with a mounting seat. A hollow plate is provided at the upper end of the mounting seat. An elastic pad is installed at the upper end of the hollow plate. Adsorption holes are densely distributed on the elastic pad and the upper end of the hollow plate. All adsorption holes communicate with the inner cavity of the upper hollow plate.

[0013] A hollow tube is installed at the lower end of the hollow plate, and the inner cavity of the hollow tube communicates with the inner cavity of the hollow plate. An elastic piston is slidably arranged in the inner cavity of the hollow tube, and a weight is installed at the lower end of the elastic piston through a connecting rod. A small retaining ring is installed on the connecting rod, and a large retaining ring that matches the small retaining ring is installed at the lower end of the upper hollow tube.

[0014] The chain conveyor has a second crossbar and a first crossbar arranged at equal height on the left and right sides respectively. One end of the first crossbar is equipped with an arc-shaped rod, and the lower end of the arc-shaped rod is located close to the chain plate.

[0015] The two ends of the second crossbar are respectively provided with diagonal bars and semi-circular guide bars;

[0016] The upper surface of the elastic pad is located above the upper surface of the conveyor belt;

[0017] The weight is provided with a contact ring that is compatible with the first and second crossbars.

[0018] As a preferred embodiment of this invention, the negative pressure self-adjusting mechanism includes a telescopic rod, a magnetic shielding plate, an adjusting magnet, and a mounting plate on which a second drive tooth and a long magnetic strip are installed;

[0019] The adjusting magnet is disposed in a groove at the bottom axis of the weight;

[0020] The telescopic rods are arranged in multiple sets in a circle with the axis at the bottom of the weight as the center. The movable ends of the multiple sets of telescopic rods are fixedly connected to the corresponding magnetic shielding plates. Centrifugal springs are sleeved on the multiple telescopic rods, and the two ends of the centrifugal springs are fixedly connected to the weight and the magnetic shielding plates, respectively.

[0021] The mounting plate is fixedly mounted on the chain conveyor.

[0022] The long magnetic strip is located on the movement path of the adjusting magnet;

[0023] Multiple sets of first drive teeth are arranged in a circular pattern on the outer wall of the weight;

[0024] The weight is rotatably connected to the lower end of the connecting rod.

[0025] In a preferred embodiment of this invention, the centrifugal spring is configured as a linear spring;

[0026] The adjusting magnet is configured as a circular structure, and the opposite end of the adjusting magnet and the long magnetic strip is configured as a spherical protrusion, and the magnetic action surface of the long magnetic strip is configured as a plane.

[0027] In a preferred embodiment of this invention, the spherical protrusion includes a protruding post located at the axis, and multiple sets of protruding rings are sequentially arranged around the periphery of the protruding post, with the protrusion height of the protruding rings gradually decreasing from the inside to the outside.

[0028] In a preferred embodiment of this invention, the descent height is controlled within the range of 0.5 to 0.8 mm.

[0029] In a preferred embodiment of this invention, the upper surface of the elastic pad is designed to be 0.5-1mm higher than the upper surface of the conveyor belt.

[0030] In summary, the technical effects and advantages of this invention are as follows:

[0031] 1. The present invention has a reasonable structure. A negative pressure adsorption mechanism is set on the back of the cardboard. By adsorbing and fixing the back of the cardboard with negative pressure, the stability of the cardboard during operation is ensured, providing a basic condition for subsequent accurate inkjet printing, and effectively avoiding the problems of scratching the printing ink and damaging the appearance of the cardboard.

[0032] At the same time, a negative pressure self-adjusting mechanism is set up, which can automatically adjust the magnitude of the negative pressure generated according to the running speed of the conveyor belt 7 to ensure the stable operation of the cardboard.

[0033] 2. In this invention, the centrifugal spring is set as a linear spring, the bottom of the adjusting magnet is set as a spherical protrusion, and the upper end of the long magnetic strip is a plane. This design makes the effective magnetic area increase slowly and uniformly as the rotation speed of the weight increases, and the change of magnetic force is approximately linear, avoiding abrupt changes in magnetic force. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a top view of the structure of the present invention;

[0036] Figure 2 for Figure 1 Frontal cross-section and enlarged structural schematic diagram;

[0037] Figure 3 for Figure 2 Schematic diagram of the negative pressure adsorption mechanism;

[0038] Figure 4 for Figure 3 Schematic diagram of the structure of a medium-heavy object viewed from below;

[0039] Figure 5 for Figure 3 Schematic diagram of the bottom structure of the medium-heavy object;

[0040] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the adjusting magnet

[0041] Figure 7 for Figure 2 Schematic diagram of a medium-speed chain conveyor.

[0042] In the diagram: 1. Support base; 2. Drive shaft; 3. Driven shaft; 4. Mounting cylinder; 5. Limiting ring; 6. Guide rod; 7. Conveyor belt; 8. Support plate; 9. Accommodation gap; 10. Chain conveyor; 11. Mounting seat; 12. Hollow plate; 13. Elastic pad; 14. Hollow tube; 15. Connecting rod; 16. Elastic piston; 17. Small retaining ring; 18. Large retaining ring; 19. Weight; 20. First crossbar; 21. Arc rod; 22. Second crossbar; 23. Diagonal rod; 24. Semicircular guide rod; 25. Mounting plate; 26. Contact ring; 27. Long magnetic strip; 28. Magnetic shielding plate; 29. ​​Centrifugal spring; 30. Telescopic rod; 31. First drive tooth; 32. Adjusting magnet; 33. Second drive tooth. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example: Reference Figure 1 The self-adjusting inkjet conveyor for carton production shown includes a belt conveyor with an inkjet printer mounting station at the top, and a negative pressure adsorption mechanism. Before inkjet printing, the negative pressure adsorption mechanism adsorbs and fixes the lower end of the moving cardboard, so that the cardboard is squeezed against the conveyor belt 7 of the belt conveyor. After inkjet printing is completed, the vacuum adsorption on the cardboard is automatically released.

[0045] The negative pressure self-adjusting mechanism adapts to the running speed of the conveyor belt 7 and changes the magnitude of the negative pressure that attracts the cardboard. The speed is directly proportional to the magnitude of the negative pressure.

[0046] As a preferred embodiment of this example, Figure 1-3 and Figure 7 As shown, the belt conveyor includes a support base 1 with a drive shaft 2 and a driven shaft 3 rotatably mounted on its upper end, as well as a support plate 8 and a guide rod 6 mounted on the support base 1.

[0047] The drive shaft 2 is driven by a drive motor mounted on the support base frame 1. Two sets of mounting cylinders 4 are respectively arranged opposite to each other on the drive shaft 2 and the driven shaft 3. Two sets of conveyor belts 7 are respectively mounted on the corresponding two sets of mounting cylinders 4. The support plate 8 is located in the inner cavity of the conveyor belt 7.

[0048] Limiting rings 5 ​​are installed on the two sets of mounting cylinders 4 and on both sides of the conveyor belt 7 respectively;

[0049] A clearance 9 is provided between the two sets of conveyor belts 7;

[0050] The negative pressure adsorption mechanism includes a chain plate conveyor 10 that moves synchronously with the conveyor belt 7. Each chain plate on the chain plate conveyor 10 is provided with a mounting seat 11. A hollow plate 12 is provided at the upper end of the mounting seat 11. An elastic pad 13 is installed at the upper end of the hollow plate 12. Adsorption holes are densely distributed on the elastic pad 13 and the upper end of the hollow plate 12. All adsorption holes communicate with the inner cavity of the upper hollow plate 12.

[0051] A hollow tube 14 is installed at the lower end of the hollow plate 12, and the inner cavity of the hollow tube 14 is connected to the inner cavity of the hollow plate 12. An elastic piston 16 is slidably arranged in the inner cavity of the hollow tube 14, and a weight 19 is installed at the lower end of the elastic piston 16 through a connecting rod 15. A small retaining ring 17 is installed on the connecting rod 15, and a large retaining ring 18 that matches the small retaining ring 17 is installed at the lower end of the upper hollow tube 14.

[0052] The chain conveyor 10 has a second crossbar 22 and a first crossbar 20 arranged at the same height on the left and right sides respectively. One end of the first crossbar 20 is equipped with an arc-shaped rod 21, and the lower end of the arc-shaped rod 21 is set close to the chain plate.

[0053] The two ends of the second crossbar 22 are respectively provided with diagonal bars 23 and semi-circular guide bars 24;

[0054] The upper end face of the elastic pad 13 is located above the upper end face of the conveyor belt 7;

[0055] The weight 19 is provided with a contact ring 26 that is adapted to the first crossbar 20 and the second crossbar 22.

[0056] During operation, when the cardboard is fed onto the belt conveyor 1 by the feeding machine or manually, the cardboard is compressed by its own gravity and the elastic pad 13 (which can form a certain sealing effect to prepare for subsequent vacuum adsorption). Finally, the lower end of the cardboard contacts the upper end of the conveyor belt 7, and the cardboard moves at the same speed through the friction between the cardboard and the conveyor belt 7 and the elastic pad 13.

[0057] When the cardboard is pressed into contact with the guide rod 7 and its position is adjusted, the contact ring 26 on the weight 19 located directly below the cardboard slides off the end of the first crossbar 20. At this time, the weight of the weight 19 causes the elastic piston 16 to move downward relative to the hollow tube 14, which will generate a certain negative pressure inside the hollow plate 12, thereby achieving the adsorption of the cardboard. The adsorption force increases the squeezing force between the cardboard and the conveyor belt 7, ensuring the stability of the cardboard during operation (providing the basic conditions for subsequent accurate inkjet printing). Moreover, the negative pressure adsorption mechanism is set on the back of the cardboard inkjet printing, which effectively avoids scratching the printing ink and avoids damaging the appearance of the cardboard.

[0058] After the inkjet printing is completed, the contact ring 26 set on the corresponding weight 19 below the cardboard will press against the inclined bar 23 and move upward relative to the hollow tube 14 under the pressure guidance of the inclined bar 23. The negative pressure in the cavity of the hollow plate 12 will decrease, and the air pressure in the hollow plate 12 will eventually return to the initial state, that is, the adsorption state of the cardboard will be released. At this time, the contact ring 26 will move to the second cross bar 22 and slide relative to the second cross bar 22. After all the corresponding contact rings 26 below the cardboard have moved to the second cross bar 22, the adsorption state of the cardboard will be completely released. Then, the cardboard will make a circular motion relative to the mounting base 11 below, and the subsequent contact rings 26 will move from the second cross bar 22 to the semi-circular guide bar 24. The cardboard above will be conveyed to the next station.

[0059] The contact ring 26, which is then tilted, will contact the arc-shaped rod 21 and form a squeezing guide, eventually causing the contact ring 26 to slide onto the first crossbar 20, thus returning to its initial state. This cycle is formed, enabling continuous inkjet printing on the cardboard.

[0060] This negative pressure adsorption mechanism uses pure mechanical gravity to generate negative pressure, requiring no gas source or complex electrical control. It operates stably and reliably, with extremely low energy consumption, significantly reducing manufacturing and maintenance costs.

[0061] It should be noted that: First, both the belt conveyor 1 and the chain conveyor are electrically connected to the PLC controller, and both operate at the same speed; Second, generally, a cardboard is fixed by the negative pressure formed by multiple hollow plates 12, and the width of the hollow plates 12 should not be too wide during operation, and should be controlled between 2 and 4 cm; Third, the small retaining ring 17 can contact the large retaining ring 18 to form a blockage, preventing the elastic piston 16 from moving out of the hollow tube 14.

[0062] As a preferred embodiment of this example, Figure 3-5 As shown, the negative pressure self-adjusting mechanism includes a telescopic rod 30, a magnetic shielding plate 28, an adjusting magnet 32, and a mounting plate 25 on which a second drive tooth 33 and a long magnetic strip 27 are installed;

[0063] The adjusting magnet 32 ​​is set in the groove at the bottom axis of the weight 19;

[0064] Multiple sets of telescopic rods 30 are arranged in a circle with the axis at the bottom of the weight 19 as the center. The movable ends of the multiple sets of telescopic rods 30 are fixedly connected to the corresponding magnetic shielding plates 28. Centrifugal springs 29 are sleeved on the multiple telescopic rods 30, and the two ends of the centrifugal springs 29 are fixedly connected to the weight 19 and the magnetic shielding plates 28 respectively.

[0065] Mounting plate 25 is fixedly mounted on chain conveyor 10;

[0066] The long magnetic strip 27 is located on the movement path of the adjusting magnet 32;

[0067] Multiple sets of first drive teeth 31 are arranged in a circular pattern on the outer wall of the weight 19;

[0068] The weight 19 is rotatably connected to the lower end of the connecting rod 15.

[0069] In actual operation, since the running speed of the chain conveyor 10 is the same as that of the conveyor belt 7, the running speed of the heavy object 19 is the same as that of the conveyor belt 7.

[0070] As the speed of the conveyor belt 7 increases, the speed of the load 19 also increases accordingly. When the load 19, located directly below the cardboard, slides down from the end of the first crossbar 20, the first drive tooth 31 on it engages with the second drive tooth 33 on the mounting plate 25. As the load 19 moves laterally, the engagement of the first drive tooth 31 and the second drive tooth 33 causes the load 19 to rotate relative to the lower end of the connecting rod 15. Simultaneously, the centrifugal force causes the telescopic rod 30 to overcome the elastic force of the centrifugal spring 29 and drive the magnetic shielding plate 28 outward. By moving a certain distance, the previously obscured adjusting magnet 32 ​​is partially exposed, forming a magnetic attraction with the long magnetic strip 27 (with opposite magnetic poles to the adjusting magnet 32). This generates a certain negative pressure inside the hollow plate 12. When the conveyor belt 7 moves faster, the corresponding rotational speed of the weight 19 also increases, further increasing the negative pressure and the attraction force on the cardboard. Ultimately, this improves the stability of the cardboard. This self-adjusting negative pressure mechanism can automatically adjust the magnitude of the negative pressure according to the running speed of the conveyor belt 7 to ensure the stable operation of the cardboard.

[0071] It should be noted that the long magnetic strip 27 and the adjusting magnet 32 ​​are not only components of the negative pressure self-adjusting mechanism, but also, through the superposition of magnetic attraction and the weight of the weight 19 in the same direction, jointly drive the elastic piston 16 downward and quickly form a stable negative pressure in the inner cavity of the hollow plate 12. Under the same negative pressure adsorption force requirement, this structure can significantly reduce the mass of the weight 19, thereby greatly reducing the load and motor energy consumption of the chain plate conveyor 10 during operation. In this design structure, the weight is made of non-ferrous materials.

[0072] As a preferred embodiment of this example, Figure 6 As shown, the centrifugal spring 29 is configured as a linear spring;

[0073] The adjusting magnet 32 ​​is configured as a circular structure, and the opposite ends of the adjusting magnet 32 ​​and the long magnetic strip 27 are configured as spherical protrusions, and the magnetic action surface of the long magnetic strip 27 is configured as a plane;

[0074] As centrifugal force increases, the magnetic field area increases, and the resulting magnetic attraction increases. This will cause the weight 19 to move slightly downwards. This slight movement will reduce the distance between the two magnets, further promoting the downward movement of the weight 19. This can easily lead to excessive negative pressure in the hollow plate 12, resulting in excessive pressure between the cardboard and the conveyor belt 7. For thin cardboard, excessive negative pressure will cause the thin corrugated board to dent. Therefore, the bottom of the adjusting magnet 32 ​​is designed as a spherical protrusion. Figure 6 As shown, as the weight 19 moves downward slightly (as the rotation speed of the weight 19 increases, the magnetic force increases), the effective magnetic area increases slowly and uniformly, and the change in magnetic attraction is approximately linear, avoiding abrupt changes in magnetic force.

[0075] Furthermore, it is equipped with a linear spring, which is uniformly compressed as the centrifugal force increases. Combined with the control and adjustment of the magnetic force, it promotes uniform changes in negative pressure and effectively prevents the negative pressure from getting out of control.

[0076] As a preferred embodiment of this example, Figure 6 As shown, the spherical protrusion includes a protruding post 34 located at the axis, and multiple sets of protruding rings 35 are arranged sequentially around the periphery of the protruding post 34, and the protrusion height of the protruding rings 35 gradually decreases from the inside to the outside.

[0077] When the magnetic shielding plate 28 moves outward, the inner high-protrusion ring 35 enters the effective magnetic action range first. As the displacement increases, the outer low-protrusion ring 35 also gradually participates in the action. The stepped arrangement design further buffers the increase of magnetic force and further avoids sudden changes in magnetic action.

[0078] As a preferred embodiment of this invention, the descent height is most suitable when controlled within the range of 0.5 to 0.8 mm.

[0079] Too large or too small a value can easily cause sudden changes in magnetic force.

[0080] In a preferred embodiment of this invention, the upper surface of the elastic pad 13 is designed to be 0.5-1mm higher than the upper surface of the conveyor belt 7.

[0081] If the height difference is less than 0.5mm, the elastic deformation is insufficient and an effective seal cannot be formed, which will lead to a decrease in adsorption force; if the height difference is greater than 1mm, the cardboard will warp significantly, increasing the conveying resistance and even causing the cardboard to jam.

[0082] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-adjusting inkjet printing conveyor for carton production, comprising a belt conveyor with an inkjet printer mounting station at the upper end, characterized in that: It also includes a negative pressure adsorption mechanism. Before inkjet printing, the lower end of the moving cardboard is adsorbed and fixed by the negative pressure adsorption mechanism, so that the cardboard is squeezed against the conveyor belt (7) of the belt conveyor. After inkjet printing is completed, the vacuum adsorption on the cardboard is automatically released. The negative pressure self-adjusting mechanism adapts to the running speed of the conveyor belt (7) to change the magnitude of the negative pressure that generates adsorption force on the cardboard. The speed is directly proportional to the magnitude of the negative pressure.

2. The self-adjusting inkjet conveyor for carton production according to claim 1, characterized in that: The belt conveyor includes a support base (1) with a drive shaft (2) and a driven shaft (3) respectively rotatably mounted on the upper end, as well as a support plate (8) and a guide rod (6) respectively mounted on the support base (1). The drive shaft (2) is driven by a drive motor mounted on the support base (1). Two sets of mounting cylinders (4) are respectively arranged opposite to each other on the drive shaft (2) and the driven shaft (3). Two sets of conveyor belts (7) are respectively mounted on the corresponding two sets of mounting cylinders (4). The support plate (8) is located in the inner cavity of the conveyor belt (7). Limiting rings (5) are respectively installed on the two sets of mounting cylinders (4) and on both sides of the conveyor belt (7); A accommodating gap (9) is provided between the two sets of conveyor belts (7); The negative pressure adsorption mechanism includes a chain plate conveyor (10) that moves synchronously with the conveyor belt (7). Each chain plate on the chain plate conveyor (10) is provided with a mounting seat (11). A hollow plate (12) is provided at the upper end of the mounting seat (11). An elastic pad (13) is installed at the upper end of the hollow plate (12). Adsorption holes are densely distributed on the upper end of the elastic pad (13) and the hollow plate (12). All the adsorption holes communicate with the inner cavity of the upper hollow plate (12). A hollow tube (14) is installed at the lower end of the hollow plate (12), and the inner cavity of the hollow tube (14) is connected to the inner cavity of the hollow plate (12). An elastic piston (16) is slidably arranged in the inner cavity of the hollow tube (14), and a weight (19) is installed at the lower end of the elastic piston (16) through a connecting rod (15). A small retaining ring (17) is installed on the connecting rod (15), and a large retaining ring (18) that matches the small retaining ring (17) is installed at the lower end of the upper hollow tube (14). The chain plate conveyor (10) has a second crossbar (22) and a first crossbar (20) at the same height on the left and right sides respectively. One end of the first crossbar (20) is equipped with an arc-shaped rod (21), and the lower end of the arc-shaped rod (21) is set close to the chain plate. The second crossbar (22) is provided with a diagonal bar (23) and a semi-circular guide bar (24) at both ends. The upper end face of the elastic pad (13) is located above the upper end face of the conveyor belt (7); The weight (19) is provided with a contact ring (26) that is adapted to the first crossbar (20) and the second crossbar (22).

3. The self-adjusting inkjet conveyor for carton production according to claim 2, characterized in that: The negative pressure self-adjusting mechanism includes a telescopic rod (30), a magnetic shielding plate (28), an adjusting magnet (32), and a mounting plate (25) on which a second drive tooth (33) and a long magnetic strip (27) are installed. The adjusting magnet (32) is disposed in a groove at the bottom axis of the weight (19); Multiple sets of telescopic rods (30) are arranged in a circle with the axis at the bottom of the weight (19) as the center. The movable ends of the multiple sets of telescopic rods (30) are fixedly connected to the corresponding magnetic shielding plates (28). Centrifugal springs (29) are sleeved on the multiple telescopic rods (30), and the two ends of the centrifugal springs (29) are fixedly connected to the weight (19) and the magnetic shielding plates (28) respectively. The mounting plate (25) is fixedly mounted on the chain conveyor (10); The long magnetic strip (27) is located on the movement path of the adjusting magnet (32); Multiple sets of first drive teeth (31) are arranged in a circular pattern on the outer wall of the weight (19). The weight (19) is rotatably connected to the lower end of the connecting rod (15).

4. The self-adjusting inkjet conveyor for carton production according to claim 3, characterized in that: The centrifugal spring (29) is configured as a linear spring; The adjusting magnet (32) is configured as a circular structure, and the opposite end of the adjusting magnet (32) and the long magnetic strip (27) is configured as a spherical protrusion end, and the magnetic action surface of the long magnetic strip (27) is configured as a plane.

5. A self-adjusting inkjet printing conveyor for carton production according to claim 4, characterized in that: The spherical protrusion includes a protruding post (34) located at the center of the axis, and multiple sets of protruding rings (35) are arranged sequentially around the protruding post (34), and the protrusion height of the protruding rings (35) gradually decreases from the inside to the outside.

6. A self-adjusting inkjet conveyor for carton production according to claim 5, characterized in that: The descent height is controlled within the range of 0.5 to 0.8 mm.

7. A self-adjusting inkjet printing conveyor for carton production according to claim 6, characterized in that: The upper surface of the elastic pad (13) is designed to be 0.5-1mm higher than the upper surface of the conveyor belt (7).

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