Low power digital printing web conveyance mechanism

Abstract

The utility model discloses a low -power digital printing line paperboard conveying mechanism relates to digital printing technical field, specifically includes the belt with the hole and vacuum pump, the one end of belt with the hole inboard is provided with the negative pressure box, forms the negative pressure cavity between the straight section on belt with the hole and negative pressure box, both sides of negative pressure box inner chamber all are provided with the moving plate, the moving plate is connected with negative pressure box through linear movement structure, the middle part of negative pressure box inner chamber is provided with vacuum pressure sensor. The relative position of both sides moving plate of negative pressure box is adjusted through linear movement structure, can accurate change the volume of negative pressure cavity according to the actual size of paperboard, and the data that vacuum pressure sensor gathers compares with the target adsorption pressure threshold value of predetermining, realizes the dynamic regulation of vacuum pump exhaust power, accurately maintains the optimal negative pressure condition required for paperboard stable adsorption, avoids " overextraction of air ", guarantees paperboard stable adsorption while significantly reducing energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of digital printing technology, specifically a low-power digital printing line paperboard conveying mechanism. Background Technology

[0002] With the rapid development of digital printing technology, cardboard, as an important substrate in packaging, printing, and other fields, is experiencing a surge in printing and processing demands. Digital printing lines place extremely high requirements on the cardboard conveying process. Currently, digital printing lines typically utilize negative pressure belt conveyors to transport cardboard. A typical structure of this mechanism consists of the following components: a ring-shaped belt with evenly distributed micro-suction holes on its surface; a negative pressure chamber connected to a negative pressure fan via pipes; and a drive roller and tensioning device. During operation, the negative pressure fan activates, creating a low-pressure zone within the negative pressure chamber. The suction holes on the belt surface utilize negative pressure to adhere to the lower surface of the cardboard. Simultaneously, the drive roller rotates, moving the belt and thus achieving continuous cardboard transport.

[0003] However, during actual use, the cardboard and the conveyor belt are typical dissimilar materials rubbing against each other, which easily generates static electricity and leads to the continuous accumulation of charge. The generation of static electricity adversely affects the separation of the printed cardboard from the conveyor belt. Furthermore, under the action of negative pressure adsorption, debris around the conveyor mechanism easily enters the belt holes, causing blockage. This not only compromises the airtightness of the negative pressure system of the conveyor mechanism but also reduces the effective adsorption area within the negative pressure chamber. To maintain a given adsorption force, the vacuum pump must increase its pumping power to compensate for leakage, resulting in increased energy consumption. Based on this, this application proposes a low-power cardboard conveying mechanism for digital printing lines. Utility Model Content

[0004] This invention provides a low-power digital printing line cardboard conveying mechanism, which solves the problems mentioned in the background art, such as the difficulty in separating the printed cardboard from the belt and the easy clogging of the belt holes leading to increased energy consumption.

[0005] This utility model provides the following technical solution: a low-power digital printing line cardboard conveying mechanism, including a perforated belt and a vacuum pump. A negative pressure box is provided at one end of the inner side of the perforated belt. A negative pressure cavity is formed between the straight section of the perforated belt and the negative pressure box. Movable plates are provided on both sides of the inner cavity of the negative pressure box. The movable plates are connected to the negative pressure box through a linear moving structure. A vacuum pressure sensor is provided in the middle of the inner cavity of the negative pressure box. The air inlet of the vacuum pump is connected to the inner cavity of the negative pressure box through an air inlet pipe. A first air-blowing plate is provided at the other end of the inner side of the perforated belt. The air outlet of the vacuum pump is connected to the air inlet of the first air-blowing plate through a first air outlet pipe. A cleaning assembly is provided at the end of the perforated belt away from the negative pressure box. The cleaning assembly includes a second air-blowing plate located inside the perforated belt and a dust collection box located below the perforated belt. The second air-blowing plate is located below the first air-blowing plate. The air outlet of the vacuum pump is connected to the air inlet of the second air-blowing plate through a second air outlet pipe. The dust collection box is located below the second air-blowing plate. A dust collection chamber is formed between the dust collection box and the lower straight section of the perforated belt. Conductive metal frames are provided on both sides of the dust collection box. A conductive metal roller is movably connected to the top of the conductive metal frame. The conductive metal roller contacts the bottom of the perforated belt.

[0006] Preferably, the top of the negative pressure box, the top of the moving plate, and the top of the dust collection box are all inlaid with sealing strips, and the top of the sealing strips flexibly fits against the perforated belt.

[0007] Preferably, the air inlet of the vacuum pump is provided with an air filter.

[0008] Preferably, the top of the first air blowing plate is uniformly provided with first exhaust holes, and the distance between the first exhaust holes and the negative pressure box is not less than the size of the cardboard in the length direction of the perforated belt; the bottom of the second air blowing plate is uniformly provided with second exhaust holes.

[0009] Preferably, the inner cavity of the dust collection box is connected to an impurity filter screen, and an air flow channel is formed between the impurity filter screen and the inner wall of the dust collection box. An air exhaust pipe is provided on one side of the air flow channel.

[0010] Preferably, an electric ball valve is provided at one end of both the first air outlet pipe and the second air outlet pipe.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. This low-power digital printing line cardboard conveying mechanism adjusts the relative position of the moving plates on both sides of the negative pressure box through a linear movement structure. It can accurately change the volume of the negative pressure chamber according to the actual size of the cardboard. The data collected by the vacuum pressure sensor is compared with the preset target adsorption pressure threshold to realize the dynamic adjustment of the vacuum pump's pumping power. It accurately maintains the optimal negative pressure conditions required for stable adsorption of cardboard, avoids "over-pumping", and significantly reduces energy consumption while ensuring stable adsorption of cardboard.

[0012] 2. This low-power digital printing line cardboard conveying mechanism effectively utilizes the exhaust from the vacuum pump. Part of the vacuum pump exhaust reduces the adhesion between the cardboard and the perforated belt, facilitating separation. The remaining exhaust cleans the perforated belt, reducing its clogging probability, maintaining the stable airtightness of the negative pressure adsorption system, ensuring the continuous reliability of the adsorption force during cardboard conveying, and minimizing the increase in energy consumption due to belt clogging. It also features an electrostatic removal function, using conductive metal rollers and frames to eliminate static electricity on the perforated belt, improving airflow dust removal efficiency, reducing the probability of impurities adhering to the belt due to static electricity, and continuously maintaining the cleanliness of the belt surface and the stability of the airflow dust removal effect. Attached Figure Description

[0013] Figure 1 A front view of a low-power digital printing line cardboard conveying mechanism provided by this utility model; Figure 2 The structure of this utility model Figure 1 Rear view illustration; Figure 3 This is a top view of the negative pressure box structure of this utility model; Figure 4 The structure of this utility model Figure 3 Explosion diagram; Figure 5 This is a schematic cross-sectional view of the dust collection box structure of this utility model; Figure 6 This is a bottom view of the dust collection box structure of this utility model.

[0014] In the diagram: 1. Perforated belt; 2. Negative pressure box; 3. Air filter; 4. Air inlet pipe; 5. Linear movement structure; 6. Vacuum pump; 7. Dust collection box; 8. Conductive metal frame; 9. Second air outlet pipe; 10. First air outlet pipe; 11. First air blowing plate; 12. Servo motor; 13. Support rod; 14. Connecting frame; 15. Impurity filter screen; 16. Sealing strip; 17. Vacuum pressure sensor; 18. Moving plate; 19. Second air blowing plate; 20. Conductive metal roller; 21. Air exhaust pipe; 22. Electric ball valve; 23. Support frame; 24. Synchronous roller. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] This utility model provides an embodiment: Please refer to Figures 1-6 A low-power digital printing line paperboard conveying mechanism includes a perforated belt 1, a vacuum pump 6, and two support frames 23. Synchronous rollers 24 are movably connected to the top of each support frame 23. The two synchronous rollers 24 are connected via the perforated belt 1. A servo motor 12 is installed on one side of one support frame 23. The output shaft of the servo motor 12 is connected to the synchronous roller 24 via a reducer and a coupling. When the servo motor 12 is working, it can drive the synchronous roller 24 connected to it to rotate. The rotating synchronous roller 24 can drive the perforated belt 1 to rotate. In use, the perforated belt 1 can be used to convey the paperboard for the digital printing line.

[0017] A negative pressure box 2 is installed at one end of the inner side of the perforated belt 1. A support rod 13 is installed at the bottom of the negative pressure box 2, and the negative pressure box 2 is connected to the support frame 23 through the support rod 13. The top of the negative pressure box 2 and the bottom of the straight section of the perforated belt 1 form a negative pressure cavity. The air inlet of the vacuum pump 6 is connected to the inner cavity of the negative pressure box 2 through the air inlet pipe 4. When the vacuum pump 6 is working, it can draw away the air in the negative pressure box 2, so that the negative pressure cavity is in a negative pressure state. The cardboard located above the negative pressure cavity can be adsorbed onto the upper surface of the perforated belt 1 due to the negative pressure, thereby fixing the position of the cardboard and ensuring the stability of the cardboard position during the conveying process, which facilitates the printing operation of the cardboard during the conveying process.

[0018] In addition, movable plates 18 are provided on both sides of the inner cavity of the negative pressure box 2. The movable plates 18 are connected to the negative pressure box 2 through a linear moving structure 5. A sealing strip 16 is embedded in the top of the negative pressure box 2 and the top of the movable plate 18. The top of the sealing strip 16 flexibly fits against the bottom of the straight section of the perforated belt 1. The movable plate 18 and the inner wall of the negative pressure box 2 are flexibly fitted together through a sealing gasket to ensure the sealing between them. In use, the elastic deformation of the sealing strip 16 can ensure the sealing between the negative pressure box 2 and the perforated belt 1, and between the movable plate 18 and the negative pressure box 2. In embodiment 1, the linear moving structure 5 is an electric telescopic rod.

[0019] By setting up the linear moving structure 5, the operation of the linear moving structure 5 can change the position of the moving plate 18 connected to it. The change in the distance between the two moving plates 18 can change the volume of the negative pressure chamber. Thus, when this application is conveying small-sized cardboard, the negative pressure chamber space can be reduced, the ineffective area that needs to maintain negative pressure can be reduced, and the energy consumption of this application can be reduced. Conversely, the moving plate 18 can be driven away to adapt to large-sized cardboard, thereby improving the adaptability of this application.

[0020] A vacuum pressure sensor 17 is installed in the middle of the inner cavity of the negative pressure box 2. The vacuum pressure sensor 17 can be used to monitor the pressure inside the negative pressure chamber in real time. When this application is used, the controller of this application compares the data collected by the vacuum pressure sensor 17 with the preset target adsorption pressure threshold, and can realize the dynamic control of the pumping power of the vacuum pump 6. Under the premise of ensuring that the cardboard obtains a stable adsorption force, the energy consumption is effectively reduced, taking into account both the reliability of the conveying and the requirements of low power consumption.

[0021] An air filter 3 is installed at the air inlet of the vacuum pump 6. The air filter 3 is used to filter the air entering the vacuum pump 6. By intercepting pollutants such as dust particles, paper scraps, and oil mist in the air, it effectively prevents such impurities from entering the vacuum pump 6, reduces the impact of impurities in the air on the vacuum pump 6, extends the service life of the vacuum pump 6, and maintains its stable operating performance. The air filter 3 adopts mature filtration technology (such as conventional structures such as filter screen interception and filter element adsorption). Its specific working principle and structural composition are common knowledge and will not be described in detail here.

[0022] The other end of the perforated belt 1 is provided with a first air blowing plate 11. The air outlet of the vacuum pump 6 is connected to the air inlet of the first air blowing plate 11 through the first air outlet pipe 10. The top of the first air blowing plate 11 is evenly provided with first exhaust holes. The distance between the first exhaust hole and the negative pressure box 2 is not less than the size of the cardboard in the length direction of the perforated belt 1. The distance between the first exhaust hole and the negative pressure box 2 can be set according to the requirements, which will not be elaborated here. With the first air blowing plate 11, the air discharged from the outlet of the vacuum pump 6 can enter the first air blowing plate 11 through the first air outlet pipe 10. The air in the first air blowing plate 11 is blown onto the upper straight section of the perforated belt 1 through the first exhaust hole, and the airflow blows upward from the bottom of the upper straight section of the perforated belt 1. When the cardboard and the negative pressure box 2 are misaligned and enter the airflow action area of ​​the first exhaust hole, the air discharged from the first exhaust hole can directly act on the lower surface of the cardboard. By breaking the sealed air layer formed by the negative pressure adsorption between the cardboard and the belt, the contact pressure between the two is significantly reduced. At the same time, the shearing force generated by the directional airflow can effectively offset the static friction and residual electrostatic adsorption effect between the cardboard and the belt, thereby greatly reducing the overall adsorption force between the cardboard and the belt. This ensures that the cardboard can be easily and smoothly separated from the belt during the conveying process, avoiding conveying jams or printing offset problems caused by adhesion, and improving the stability and efficiency of the overall production process.

[0023] A cleaning component is provided at the end of the perforated belt 1 away from the negative pressure box 2. The cleaning component includes a second air blowing plate 19 located inside the perforated belt 1 and a dust collection box 7 located below the perforated belt 1. The second air blowing plate 19 is located below the first air blowing plate 11. The air outlet of the vacuum pump 6 is connected to the air inlet of the second air blowing plate 19 through the second air outlet pipe 9. The bottom of the second air blowing plate 19 is evenly provided with second exhaust holes. The airflow discharged from the air outlet of the vacuum pump 6 can enter the inner cavity of the second air blowing plate 19 through the second air outlet pipe 9. The airflow in the second air blowing plate 19 is directionally sprayed onto the lower straight section of the perforated belt 1 through the second exhaust holes to clean the lower straight section of the perforated belt, reduce the probability of the holes of the perforated belt 1 being blocked by impurities, and ensure the continuous reliability of the adsorption force during the cardboard conveying process.

[0024] Both the first air outlet duct 10 and the second air outlet duct 9 are equipped with an electric ball valve 22 at one end. The controller of this application precisely controls the opening of the electric ball valve 22 to adjust the distribution of airflow discharged from the vacuum pump 6 in real time, ensuring sufficient pneumatic assistance in the cardboard separation process while ensuring that the airflow intensity in the dust removal area meets the cleaning requirements, thus achieving precise and efficient management of airflow resources in the conveying system. The opening of the electric ball valve 22 can be adjusted as needed and is not limited here.

[0025] The dust collection box 7 is located below the second blowing plate 19. A dust collection chamber is formed between the dust collection box 7 and the lower straight section of the perforated belt 1. A sealing strip 16 is embedded in the top of the dust collection box 7, and the top of the sealing strip 16 flexibly fits the perforated belt 1. After the airflow from the second blowing plate 19 onto the perforated belt 1 carries away the impurities clogging the holes, the impurities enter the dust collection box 7 with the air, achieving targeted collection and removal of impurities clogging the belt holes. A conical connecting frame 14 is connected to the top of the inner cavity of the dust collection box 7, and an impurity filter screen 15 is connected to the bottom of the connecting frame 14. The impurity filter screen 15 filters the dust-laden air, forming an airflow channel between the impurity filter screen 15 and the inner wall of the dust collection box 7. An air exhaust pipe 21 is provided on one side of the airflow channel. The filtered air enters the airflow channel and is discharged through the air exhaust pipe 21. The mesh diameter of the impurity filter screen 15 can be set according to requirements, which will not be elaborated here.

[0026] Conductive metal frames 8 are provided on both sides of the dust collection box 7. A conductive metal roller 20 is movably connected to the top of the conductive metal frame 8, and the conductive metal roller 20 contacts the bottom of the perforated belt 1. Through the setting of the conductive metal roller 20 and the conductive metal frame 8, when in use, the static electricity generated on the surface of the perforated belt 1 due to friction can be transmitted to the ground through the conductive metal roller 20 and the conductive metal frame 8 in contact with it, thereby eliminating the static electricity on the perforated belt 1, facilitating the separation of impurities from the perforated belt 1, and thus improving the airflow dust removal effect. Furthermore, after the perforated belt 1 is dusted, the conductive metal roller 20 and the conductive metal frame 8 on the other side of the dust collection box 7 are used to eliminate static electricity from the perforated belt 1 after dust removal, avoiding the generation of static electricity due to friction between the airflow and the holes during the dust removal process, maintaining the cleanliness of the surface of the perforated belt 1 and the stability of the airflow dust removal effect, and ensuring the reliable operation of the entire conveying system.

[0027] The materials of the sealing strip 16, conductive metal roller 20, conductive metal frame 8, and sealing gasket can all be set according to requirements, and there are no restrictions here.

[0028] All electrical components involved in this application are existing technologies. Those skilled in the art can select appropriate models of electrical components according to their needs. No restrictions or elaborations are made here. Those skilled in the art understand their connection methods. With the help of those skilled in the art, all electrical components in this application and their compatible power supplies are connected by wires. According to the actual situation, appropriate controllers are selected to meet control requirements. For specific connections and control sequences, please refer to the description below. The electrical connections between each electrical component are completed in the order of their operation. The detailed connection methods are well-known technologies in the art. The following mainly introduces the working principle and process, and will not describe the electrical control.

[0029] In summary: When using this low-power digital printing line cardboard conveying mechanism, the operator adjusts the distance between the two moving plates 18 according to the width of the cardboard to match the size of the negative pressure chamber with the cardboard size. During use, the cardboard is placed on the negative pressure chamber, and the vacuum pump 6 operates, removing air from the chamber and creating a negative pressure environment. Under this negative pressure, the cardboard is fixed to the perforated belt 1. The servo motor 12 drives the synchronous roller 24 to rotate, which in turn drives the perforated belt 1. The perforated belt 1 ensures stable conveying of the cardboard. When the cardboard is offset from the negative pressure box 2 and enters the airflow area of ​​the first exhaust vent, the air discharged from the first exhaust vent can... The airflow directly acts on the lower surface of the cardboard, breaking the adhesion between the cardboard and the perforated belt 1, facilitating the separation of the cardboard from the perforated belt 1. When the perforated belt 1 moves below the second blowing plate 19, the airflow ejected by the second blowing plate 19 can achieve airflow dust removal for the perforated belt 1. The dust-laden air generated during the airflow dust removal process enters the dust collection box 7, and the impurity filter screen 15 filters the dust-laden air. The filtered air is discharged through the air exhaust pipe 21. Furthermore, before and after dust removal, the perforated belt 1 uses the conductive metal roller 20 and the conductive metal frame 8 to eliminate static electricity, maintaining the cleanliness of the surface of the perforated belt 1 and the stability of the airflow dust removal effect, ensuring the reliable operation of the entire conveying system.

[0030] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each structure adopt conventional technical means such as bolt connection in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology. The materials and specifications of each component can be selected according to the requirements and are not limited here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art. Although the embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A low-power digital printing line paperboard conveying mechanism, comprising a perforated belt (1) and a vacuum pump (6), characterized in that: A negative pressure box (2) is provided at one end of the inner side of the perforated belt (1). A negative pressure cavity is formed between the straight section of the perforated belt (1) and the negative pressure box (2). Movable plates (18) are provided on both sides of the inner cavity of the negative pressure box (2). The movable plates (18) are connected to the negative pressure box (2) through a linear moving structure (5). A vacuum pressure sensor (17) is provided in the middle of the inner cavity of the negative pressure box (2). The air inlet of the vacuum pump (6) is connected to the inner cavity of the negative pressure box (2) through an air inlet pipe (4). A first blower plate (11) is provided at the other end of the inner side of the perforated belt (1). The air outlet of the vacuum pump (6) is connected to the air inlet of the first blower plate (11) through the first air outlet pipe (10). A cleaning assembly is provided at the end of the perforated belt (1) away from the negative pressure box (2). The cleaning assembly includes a second blower plate (19) located inside the perforated belt (1) and a dust collection box (7) located below the perforated belt (1). The second blower plate (19) is located below the first blower plate (11). In this configuration, the air outlet of the vacuum pump (6) is connected to the air inlet of the second blower plate (19) through the second air outlet pipe (9). The dust collection box (7) is located below the second blower plate (19). A dust collection chamber is formed between the dust collection box (7) and the lower straight section of the perforated belt (1). Conductive metal frames (8) are provided on both sides of the dust collection box (7). A conductive metal roller (20) is movably connected to the top of the conductive metal frame (8). The conductive metal roller (20) is in contact with the bottom of the perforated belt (1).

2. A low power digital printing web board transport mechanism according to claim 1, wherein: The top of the negative pressure box (2), the top of the moving plate (18) and the top of the dust collection box (7) are all inlaid with sealing strips (16), and the top of the sealing strips (16) are flexibly fitted with the perforated belt (1).

3. A low power digital printing web board transport mechanism as claimed in claim 1, wherein: The air inlet of the vacuum pump (6) is equipped with an air filter (3).

4. A low power digital printing web board transport mechanism as in claim 1, wherein: The top of the first air blower (11) is uniformly provided with first exhaust holes, and the distance between the first exhaust holes and the negative pressure box (2) is not less than the size of the cardboard in the length direction of the perforated belt (1); the bottom of the second air blower (19) is uniformly provided with second exhaust holes.

5. A low power digital printing web board transport mechanism as in claim 1, wherein: The inner cavity of the dust collection box (7) is connected to an impurity filter screen (15), and an air flow channel is formed between the impurity filter screen (15) and the inner wall of the dust collection box (7). An air exhaust pipe (21) is provided on one side of the air flow channel.

6. A low power digital printing web board transport mechanism as in claim 1, wherein: Both the first air outlet pipe (10) and the second air outlet pipe (9) are equipped with an electric ball valve (22) at one end.

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