A device for inkjet coloring the surface of a corrugated cardboard box and a control method thereof

Abstract

The present invention discloses a surface printing and production device for a corrugated cardboard box, aiming to provide a device for inkjet coloring the surface of a corrugated cardboard box board, which has good processing effect, a high degree of processing automation, and can automatically detect and adjust the ink output. The key points of the technical solution are to realize the full-process automated processing of the positioning and finished product of the corrugated cardboard board through positioning, stamping, inkjet and drying. The inkjet component in the plastic spraying and dyeing structure is provided with an ink flow meter and a pressure difference sensor, which can accurately control the flow value and avoid the problems of burrs and ink dripping after the inkjet is completed. In addition, the drying structure increases the drying effect by heating and drying twice, and prevents the pattern from being affected by incomplete drying. The present invention is applicable to the technical field of corrugated cardboard processing equipment.

Description

Technical Field

[0001] The present invention relates to a surface printing and manufacturing device for a corrugated paper box, and more particularly to an inkjet coloring device for the surface of a corrugated paper box board and a control method thereof. Background Art

[0002] The surface coloring method of corrugated cardboard on the market is usually to set multiple transmission belts for driving in the printing part. The corrugated cardboard enters the printing part through the transmission belts, and is blocked by a baffle in the printing part to form a coloring area on the surface of the corrugated cardboard. The coloring area is inkjet colored to complete the pattern printing on the surface of the corrugated cardboard. The automatic loading of the corrugated cardboard is realized by providing a transmission part at the front end of the printing part, and the rapid molding of the pattern is realized by providing a drying part at the rear end of the printing part.

[0003] In the above-mentioned inkjet coloring process of corrugated cardboard, the raw material is easily offset during the movement of the feeding structure, which causes the pattern to be offset and missing during the inkjet printing process. At the same time, in the process of inkjet printing on the corrugated cardboard, it is difficult to detect the ink output and ink pressure of the nozzle, which will lead to poor inkjet product effects and waste of resources. In addition, the overall processing continuity is poor, and it is difficult to flatten the corrugated cardboard before processing, which leads to pattern offset. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a corrugated cardboard surface inkjet coloring device and its control method with good processing effect, high degree of processing automation, and the ability to automatically detect and adjust the ink output.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a device for inkjet coloring the surface of a corrugated cardboard box, comprising a support seat, the support seat being provided with a positioning structure, a drying structure and a spray-dyeing structure arranged between the positioning structure and the drying structure, a transmission structure being provided in the positioning structure and the drying structure, and the corrugated cardboard box is circulated between the positioning structure, the drying structure and the spray-dyeing structure through the transmission structure, the spray-dyeing structure comprising a coloring box, an inkjet assembly arranged in the coloring box, a stamping assembly and a first feeding belt arranged at the bottom of the stamping assembly and the inkjet assembly.

[0006] The present invention is further configured as follows: the inkjet assembly includes a coloring channel and a second feeding belt arranged at the bottom of the coloring channel, an inkjet groove is opened at the bottom of the coloring channel, a plurality of nozzles are arranged in the inkjet groove along its length direction, an ink channel is also provided in the coloring channel, one end of the ink channel is connected to the nozzle, and the other end is provided with a liquid storage cylinder, and scrapers are also provided at both ends of the inkjet groove perpendicular to the movement direction of the second feeding belt, and the scrapers are configured to ensure the uniformity of coloring of the corrugated cardboard.

[0007] The present invention is further configured as follows: the stamping assembly includes a support layer arranged on the top of the coloring box, a stamping layer arranged on the upper end of the first feeding belt, and a buffer layer arranged between the support layer and the stamping layer, and a gap is formed between the stamping layer and the first feeding belt for passing the corrugated cardboard board.

[0008] Preferably, fixed plates are provided at both ends of the support layer, buffer layer and embossing layer, adjacent fixed plates abut against each other, and a servo motor is provided on the fixed plate corresponding to the support layer, and the servo motor is used to drive the fixed plate to move in the vertical direction. A pressure sensor and a displacement sensor are provided on the fixed plate corresponding to the buffer layer, and an embossing roller is also provided in the fixed plate corresponding to the embossing layer, a rubber film is provided on the outside of the embossing roller, and the embossing roller is configured to rotate in the fixed plate.

[0009] The present invention is further configured as follows: the positioning structure includes a placement rack arranged on a side away from the plastic spraying and dyeing structure and a loading assembly arranged on the placement rack, the loading assembly includes a measuring ruler and limit blocks arranged at both ends of the measuring ruler, and the two limit blocks can move toward / away from each other along the length direction of the measuring ruler.

[0010] Preferably, the transmission structure is arranged on one side of the positioning structure and includes a plurality of transmission wheels arranged at one end of the positioning structure, a transmission belt arranged on the transmission wheel and a plurality of pressure wheels above the transmission belt. The position of each pressure wheel matches the position of the transmission belt. Height adjustment parts are also provided at both ends of the pressure wheel. The height adjustment parts are configured to adjust the relative distance between the pressure wheel and the transmission belt. A slider is also provided between the height adjustment part and the positioning structure. The slider is configured to control the movement of the pressure wheel along the length direction of the positioning structure.

[0011] The present invention is further configured as follows: the drying structure includes a heating component arranged on a side close to the plastic spraying and dyeing structure and a drying component arranged on a side away from the plastic spraying and dyeing structure, and the corrugated cardboard board moves between the heating component and the drying component through a transmission structure in the drying structure.

[0012] Preferably, the heating component includes a heating rod arranged at the upper end of the transmission structure and a heating roller sleeved on the outside of the heating rod, and the drying component includes an air outlet rod arranged at the upper end of the transmission structure and a plurality of air outlets evenly arranged along the length direction of the air outlet rod.

[0013] The present application also provides a control method for an inkjet coloring device for a surface of a corrugated cardboard, comprising the following steps: S1, placing the corrugated cardboard to be printed on a measuring ruler, and making the central axis of the corrugated cardboard match the center position of the measuring ruler;

[0014] S2. Adjust the positions of the limit blocks at both ends of the measuring ruler so that the limit blocks respectively contact the two ends of the corrugated cardboard, and record the width of the corrugated cardboard displayed on the measuring ruler. Upload the corrugated cardboard width information to the spray-dyeing structure for information preprocessing;

[0015] S3. Place the corrugated cardboard board on the positioning structure. At the same time, the pressing wheel at the positioning structure moves toward the corrugated cardboard board through the height adjustment member. When the pressing wheel detects that it is in contact with the corrugated cardboard board, the pressing wheel stops moving and records the thickness of the corrugated cardboard board. The thickness information is uploaded to the spray-dyeing structure for information preprocessing.

[0016] S4, the pressing wheel moves along the length direction of the positioning structure through the slider, and at the same time the transmission belt of the transmission structure moves synchronously, driving the corrugated box board to move closer to the spray-dyeing mechanism;

[0017] S5. The stamping assembly in the spray-dyeing mechanism adjusts its height. The fixed plate at the support layer adjusts the height of the support layer via a servo motor. At the same time, the pressure sensor at the buffer layer detects the pressures P1 and P2 at the upper and lower ends of the fixed plate of the buffer layer. If P1 = 0 or P2 = 0, it is determined that the current buffer layer does not conflict with the stamping layer or the support layer, and the support layer continues to move. Conversely, if both P1 and P2 are greater than 0, it is determined that both ends of the current buffer layer conflict with the stamping layer and the support layer, and the displacement sensor begins to record the movement distance of the buffer layer.

[0018] S6. The displacement sensor calculates the movement distance of the buffer layer and determines the distance of the gap between the current embossing layer and the first feeding belt based on the movement distance, so that the distance of the gap matches the thickness of the corrugated box board;

[0019] S7, after the printing assembly flattens the corrugated cardboard board, the corrugated cardboard board moves into the inkjet assembly and moves in the coloring channel through the second feeding belt, and the color is sprayed on the surface of the corrugated cardboard board in the coloring channel to complete the printing;

[0020] S8. After the printing of the corrugated cardboard is completed, the heating rod of the drying structure heats the heating roller. The minimum drying and forming temperature of the ink is set to Tl and the maximum is set to Th. At the same time, the heating roller detects the current temperature. The detected temperature is T. If T < Tl or T > Th, it is determined that the current temperature of the heating roller does not meet the requirements. The temperature of the heating rod is adjusted to increase / decrease the temperature of the heating roller. Otherwise, it is determined that the current temperature of the heating roller meets the processing requirements. The colored corrugated cardboard is controlled to enter the drying structure.

[0021] S9. After the heating rollers have finished heating and drying the corrugated cardboard board, the transmission structure at the bottom of the drying structure drives the corrugated cardboard board to continue moving, and dries the surface of the corrugated cardboard board through the drying components to complete the coloring process.

[0022] Preferably, an ink flow meter and a pressure difference sensor are further provided in the coloring channel, the ink flow meter is arranged in the ink channel near the nozzle, the pressure difference sensor is arranged in the nozzle and is used to detect the pressure difference between the inside and outside of the nozzle hole, and the corrugated cardboard coloring method of step S7 includes the following steps: S71, the inkjet slot performs inkjet coloring, and at the same time sets the flow threshold required for coloring the corrugated cardboard to Ll-Lm. During the inkjet process, the ink flow meter detects the ink flow in the ink channel, and the detection result is L. If L<Ll, it is judged that the current ink flow is too small, resulting in uneven coloring of the corrugated cardboard, burrs appear on the edges of the lines after dyeing, and the liquid storage cylinder needs to be replenished with ink. If L>Lm, it is judged that the current ink flow is too large, resulting in excessive ink on the surface of the corrugated cardboard, ink dripping is likely to occur, and the size of the nozzle needs to be adjusted. On the contrary, if Ll<L<Lm, it is judged that the flow is normal, and jumps to S72 for pressure difference detection;

[0023] S72. Set the initial detection values ​​of the pressure difference sensor inside and outside the nozzle to Pn and Pw. During the operation of the nozzle, the pressure difference inside and outside the nozzle during the inkjet process is detected by the pressure difference sensor, which are Pn1 and Pw1 respectively. If -0.35kPa>Pn1-Pw1>+0.35kPa, it is judged that the current pressure difference inside and outside the nozzle is too large, the device is stopped and the staff is notified for maintenance. On the contrary, if -0.35kPa<Pn1-Pw1<+0.35kPa, it is judged that the current device is operating normally.

[0024] By adopting the above technical solution, the beneficial effects are as follows: 1. The present application realizes the full-process automated processing of positioning of corrugated cardboard boards to finished products through positioning, embossing, inkjet and drying. Specifically, the positioning mechanism adopts the linkage of adjustable limit blocks and measuring rulers to automatically collect the width and thickness data of the cardboard and upload them for pre-processing, thereby preventing errors caused by manual measurement. At the same time, the embossing component drives the lifting and lowering of the support layer through a servo motor to adjust the gap between the embossing layer and the first feeding belt, so that the embossing component can dynamically adapt to corrugated cardboard boards of different thicknesses. At the same time, the buffer layer provides real-time feedback through pressure sensors and displacement sensors to ensure the precise matching of flattening force and cardboard thickness. The inkjet assembly in the plastic spraying and dyeing structure is provided with an ink flow meter and a pressure differential sensor, which can accurately control the flow value to avoid burrs and ink dripping after inkjet is completed. In addition, the drying structure increases the drying effect through two heating dryings to prevent incomplete drying from affecting the pattern.

[0025] 2. Furthermore, the nozzles of the present application are arranged in a direction perpendicular to the second feed belt, and the ink is constrained by a scraper to eliminate the accumulation of ink at the edge, increase the uniformity of the pattern after the inkjet coloring is completed, and the height of the scraper is adjustable to prevent the ink from exceeding the pattern of the coloring area. At the same time, the flow meter can detect the input flow at the nozzle end in real time, and can automatically produce an ink replenishment strategy or a nozzle adjustment strategy according to the flow rate after detecting the flow abnormality, and the pressure difference sensor can detect the internal and external pressure difference of the nozzle, thereby preventing the ink break problem caused by excessive internal and external pressure difference. The overall degree of automation is high, and the finished product of inkjet coloring has a good effect.

[0026] 3. At the same time, the corrugated cardboard needs to be flattened and adjusted before inkjet printing. During the adjustment process, the buffer layer intelligently detects the contact state of the support layer and the embossing layer through the pressure sensor, so that when the pressure is greater than 0, it is determined that the current buffer layer is in contact with the support layer and the embossing layer, so that the support layer can adjust the height of the embossing layer through the buffer layer. The height adjustment parameters are detected by the displacement sensor, and the overall degree of automation is high. At the same time, the outer cover of the embossing roller is provided with a rubber film, which can flatten the corrugated cardboard without damaging the surface of the cardboard. At the same time, the rubber film has a large friction force, which can facilitate the transmission of the corrugated cardboard.

[0027] 4. In addition, in the process of inkjet coloring on corrugated cardboard, in order to prevent the change of flow from affecting the inkjet effect, specifically, by setting an ink flow meter near the nozzle in the ink channel, the ink flow can be detected in real time. When the ink in the liquid storage cylinder is insufficient, the ink flow is too small, which will lead to uneven ink discharge and low continuity of ink droplets, resulting in broken lines and virtual printing on the pattern on the corrugated cardboard, jagged edges and burrs on the pattern, and at the same time reducing the performance of the pattern surface. On the contrary, if the opening at the nozzle is too large, the ink on the opening side will be The larger the flow rate, the shorter the life of the nozzle, resulting in waste of ink and increased energy consumption for subsequent drying, which increases the cost of production. By dynamically monitoring the coloring channel according to the flow rate detection, the qualified rate of the processing process is improved. At the same time, the differential pressure sensor can detect the internal and external pressure difference of the nozzle. If the pressure difference is too large, it will lead to the loss of control of the ink drop shape during the inkjet process. Generally speaking, when the pressure outside the nozzle is greater than the pressure inside the nozzle, and the internal and external pressure difference is too large, the ink droplet ejection distance will be closer, making the color of the middle part of the pattern lighter, affecting the coloring. effect. On the contrary, if the pressure inside the nozzle is greater than the pressure outside the nozzle, and the internal and external pressure difference is too large, it will cause damage to the nozzle, increase the diameter of the ink droplets, and affect the effect of the pattern. In addition, after the inkjet coloring is completed, the printed pattern needs to be dried at the drying structure. At the heating component of the drying structure, the heating roller uses the temperature threshold of the ink solidification as a benchmark to detect the temperature of the heating roller in real time and adjust the power of the heating rod based on the detected temperature. At the same time, the material of the heating roller can preferably be silicon carbide ceramic, which has good thermal conductivity and can avoid thermal stress. It can prevent the color in the pattern from being taken away during the process of contacting with the pattern to dry the pattern. The heating effect is good and the integrity of the pattern is protected. After the ink layer is penetrated and solidified by the heating roller, the pattern can maintain its basic shape, preventing the surface ink from being displaced and damaging the pattern during the subsequent blowing process. The hot air is sprayed through the air outlet rod to achieve rapid surface shaping. At the same time, the heating roller can detect the temperature so that it can automatically adjust after the temperature exceeds the limit to prevent insufficient heating and overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the specific structure of an embodiment of an inkjet coloring device for the surface of a corrugated cardboard box and a control method thereof according to the present invention;

[0029] Figure 2 This is a schematic diagram of the specific structure of the positioning structure of an embodiment of an inkjet coloring device for a corrugated cardboard surface and a control method thereof according to the present invention;

[0030] Figure 3 This is a schematic diagram of the specific structure of the plastic spray dyeing structure of an embodiment of an inkjet coloring device for the surface of a corrugated cardboard box and a control method thereof according to the present invention;

[0031] Figure 4 This is a schematic diagram of the specific structure of the drying structure of an embodiment of a device for inkjet coloring the surface of a corrugated cardboard box and a control method thereof according to the present invention;

[0032] Figure 5 This is a schematic diagram of the specific structure of the coloring channel of an embodiment of an inkjet coloring device for the surface of a corrugated cardboard box and a control method thereof according to the present invention;

[0033] Figure 6 This is a flow chart of a control method of an embodiment of an inkjet coloring device for a corrugated cardboard surface and a control method thereof according to the present invention;

[0034] Figure 7 This is a flow chart of an inkjet coloring method according to an embodiment of an inkjet coloring device for the surface of a corrugated cardboard box and a control method thereof;

[0035] Reference numerals in the figure: 1, support base; 2, positioning structure; 21, placement rack; 22, loading assembly; 221, measuring ruler; 222, limit block; 3, drying structure; 31, heating assembly; 311, heating rod; 312, heating roller; 32, drying assembly; 321, air outlet rod; 322, air outlet; 4, spray dyeing structure; 41, coloring box; 42, inkjet assembly; 421, coloring channel; 422, Second feeding belt; 423, inkjet slot; 424, nozzle; 425, ink channel; 426, liquid storage cylinder; 427, scraper; 43, stamping assembly; 431, support layer; 432, stamping layer; 433, buffer layer; 434, fixed plate; 435, servo motor; 44, first feeding belt; 5, transmission structure; 51, transmission wheel; 52, transmission belt; 53, pressure wheel; 54, height adjustment member; 55, slider. DETAILED DESCRIPTION

[0036] Reference Figures 1 to 7 The present invention further describes an embodiment of an inkjet coloring device for the surface of a corrugated cardboard box and a control method thereof.

[0037] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0038] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0039] A device for inkjet coloring the surface of a corrugated cardboard box comprises a support base 1, on which a positioning structure 2, a drying structure 3 and a plastic spraying and dyeing structure 4 arranged between the positioning structure 2 and the drying structure 3 are provided. A transmission structure 5 is provided in the positioning structure 2 and the drying structure 3. The corrugated cardboard box board flows between the positioning structure 2, the drying structure 3 and the plastic spraying and dyeing structure 4 through the transmission structure 5. The plastic spraying and dyeing structure 4 comprises a coloring box 41, an inkjet assembly 42 arranged in the coloring box 41, a stamping assembly 43 and a first feeding belt 44 arranged at the bottom of the stamping assembly 43 and the inkjet assembly 42.

[0040] The inkjet assembly 42 includes a coloring channel 421 and a second feeding belt 422 arranged at the bottom of the coloring channel 421. An inkjet groove 423 is opened at the bottom of the coloring channel 421. A plurality of nozzles 424 are arranged in the inkjet groove 423 along its length direction. An ink channel 425 is also provided in the coloring channel 421. One end of the ink channel 425 is connected to the nozzle 424, and the other end is provided with a liquid storage cylinder 426. Scrapers 427 are also provided at both ends of the inkjet groove 423 that are perpendicular to the movement direction of the second feeding belt 422. The scraper 427 is configured to ensure the uniformity of coloring of the corrugated cardboard.

[0041] The stamping assembly 43 includes a support layer 431 arranged on the top of the coloring box 41, a stamping layer 432 arranged on the upper end of the first feeding belt 44, and a buffer layer 433 arranged between the support layer 431 and the stamping layer 432. A gap is formed between the stamping layer 432 and the first feeding belt 44 for passing the corrugated cardboard.

[0042] Preferably, fixed plates 434 are provided at both ends of the support layer 431, the buffer layer 433 and the embossing layer 432, adjacent fixed plates 434 abut against each other, and a servo motor 435 is provided on the fixed plate 434 corresponding to the support layer 431, and the servo motor 435 is used to drive the fixed plate 434 to move in the vertical direction, and a pressure sensor and a displacement sensor are provided on the fixed plate 434 corresponding to the buffer layer 433, and an embossing roller is also provided in the fixed plate 434 corresponding to the embossing layer 432, a rubber film is provided on the outside of the embossing roller, and the embossing roller is configured to rotate in the fixed plate 434.

[0043] The positioning structure 2 includes a placement rack 21 arranged on a side away from the spray-dyeing structure 4 and a loading assembly 22 arranged on the placement rack 21. The loading assembly 22 includes a measuring ruler 221 and limit blocks 222 arranged at both ends of the measuring ruler 221. The two limit blocks 222 can move toward / away from each other along the length direction of the measuring ruler 221.

[0044] Preferably, the transmission structure 5 is arranged on one side of the positioning structure 2 and includes several transmission wheels 51 arranged at one end of the positioning structure 2, a transmission belt 52 arranged on the transmission wheel 51 and several pressure wheels 53 above the transmission belt 52. The position of each pressure wheel 53 matches the position of the transmission belt 52. Height adjustment parts 54 are also provided at both ends of the pressure wheel 53. The height adjustment parts 54 are configured to adjust the relative distance between the pressure wheel 53 and the transmission belt 52. A slider 55 is also provided between the height adjustment part 54 and the positioning structure 2. The slider 55 is configured to control the pressure wheel 53 to move along the length direction of the positioning structure 2.

[0045] The drying structure 3 includes a heating component 31 arranged on the side close to the plastic spraying and dyeing structure 4 and a drying component 32 arranged on the side away from the plastic spraying and dyeing structure 4. The corrugated cardboard board moves between the heating component 31 and the drying component 32 through the transmission structure 5 in the drying structure 3.

[0046] Preferably, the heating component 31 includes a heating rod 311 arranged at the upper end of the transmission structure 5 and a heating roller 312 sleeved on the outside of the heating rod 311, and the drying component 32 includes an air outlet rod 321 arranged at the upper end of the transmission structure 5 and a plurality of air outlets 322 evenly arranged along the length direction of the air outlet rod 321.

[0047] The present application also provides a control method for an inkjet coloring device for a surface of a corrugated cardboard, comprising the following steps: S1, placing the corrugated cardboard to be printed on a measuring ruler, and making the central axis of the corrugated cardboard match the center position of the measuring ruler;

[0048] S2. Adjust the positions of the limit blocks at both ends of the measuring ruler so that the limit blocks respectively contact the two ends of the corrugated cardboard, and record the width of the corrugated cardboard displayed on the measuring ruler. Upload the corrugated cardboard width information to the spray-dyeing structure for information preprocessing;

[0049] S3. Place the corrugated cardboard board on the positioning structure. At the same time, the pressing wheel at the positioning structure moves toward the corrugated cardboard board through the height adjustment member. When the pressing wheel detects that it is in contact with the corrugated cardboard board, the pressing wheel stops moving and records the thickness of the corrugated cardboard board. The thickness information is uploaded to the spray-dyeing structure for information preprocessing.

[0050] S4, the pressing wheel moves along the length direction of the positioning structure through the slider, and at the same time the transmission belt of the transmission structure moves synchronously, driving the corrugated box board to move closer to the spray-dyeing mechanism;

[0051] S5. The stamping assembly in the spray-dyeing mechanism adjusts its height. The fixed plate at the support layer adjusts the height of the support layer via a servo motor. At the same time, the pressure sensor at the buffer layer detects the pressures P1 and P2 at the upper and lower ends of the fixed plate of the buffer layer. If P1 = 0 or P2 = 0, it is determined that the current buffer layer does not conflict with the stamping layer or the support layer, and the support layer continues to move. Conversely, if both P1 and P2 are greater than 0, it is determined that both ends of the current buffer layer conflict with the stamping layer and the support layer, and the displacement sensor begins to record the movement distance of the buffer layer.

[0052] S6. The displacement sensor calculates the movement distance of the buffer layer and determines the distance of the gap between the current embossing layer and the first feeding belt based on the movement distance, so that the distance of the gap matches the thickness of the corrugated box board;

[0053] S7, after the printing assembly flattens the corrugated cardboard board, the corrugated cardboard board moves into the inkjet assembly and moves in the coloring channel through the second feeding belt, and the color is sprayed on the surface of the corrugated cardboard board in the coloring channel to complete the printing;

[0054] S8. After the printing of the corrugated cardboard is completed, the heating rod of the drying structure heats the heating roller. The minimum drying and forming temperature of the ink is set to Tl and the maximum is set to Th. At the same time, the heating roller detects the current temperature. The detected temperature is T. If T < Tl or T > Th, it is determined that the current temperature of the heating roller does not meet the requirements. The temperature of the heating rod is adjusted to increase / decrease the temperature of the heating roller. Otherwise, it is determined that the current temperature of the heating roller meets the processing requirements. The colored corrugated cardboard is controlled to enter the drying structure.

[0055] S9. After the heating rollers have finished heating and drying the corrugated cardboard board, the transmission structure at the bottom of the drying structure drives the corrugated cardboard board to continue moving, and dries the surface of the corrugated cardboard board through the drying components to complete the coloring process.

[0056] Preferably, an ink flow meter and a pressure difference sensor are further provided in the coloring channel, the ink flow meter is arranged in the ink channel near the nozzle, the pressure difference sensor is arranged in the nozzle and is used to detect the pressure difference between the inside and outside of the nozzle hole, and the corrugated cardboard coloring method of step S7 includes the following steps: S71, the inkjet slot performs inkjet coloring, and at the same time sets the flow threshold required for coloring the corrugated cardboard to Ll-Lm. During the inkjet process, the ink flow meter detects the ink flow in the ink channel, and the detection result is L. If L<Ll, it is judged that the current ink flow is too small, resulting in uneven coloring of the corrugated cardboard, burrs appear on the edges of the lines after dyeing, and the liquid storage cylinder needs to be replenished with ink. If L>Lm, it is judged that the current ink flow is too large, resulting in excessive ink on the surface of the corrugated cardboard, ink dripping is likely to occur, and the size of the nozzle needs to be adjusted. On the contrary, if Ll<L<Lm, it is judged that the flow is normal, and jumps to S72 for pressure difference detection;

[0057] S72. Set the initial detection values ​​of the pressure difference sensor inside and outside the nozzle to Pn and Pw. During the operation of the nozzle, the pressure difference inside and outside the nozzle during the inkjet process is detected by the pressure difference sensor, which are Pn1 and Pw1 respectively. If -0.35kPa>Pn1-Pw1>+0.35kPa, it is judged that the current pressure difference inside and outside the nozzle is too large, the device is stopped and the staff is notified for maintenance. On the contrary, if -0.35kPa<Pn1-Pw1<+0.35kPa, it is judged that the current device is operating normally.

[0058] The present application realizes the full-process automated processing of positioning of corrugated cardboard boards to finished products through positioning, embossing, inkjet and drying. Specifically, the positioning mechanism adopts the linkage of the adjustable limit block 222 and the measuring ruler 221, which can automatically collect the width and thickness data of the cardboard and upload them for pre-processing to prevent errors caused by manual measurement. At the same time, the embossing component 43 drives the lifting and lowering of the support layer 431 through the servo motor 435 to adjust the gap between the embossing layer 432 and the first feeding belt 44, so that the embossing component 43 can dynamically adapt to corrugated cardboard boards of different thicknesses. At the same time, the buffer layer 433 provides real-time feedback through the pressure sensor and the displacement sensor to ensure the precise matching of the flattening force and the thickness of the cardboard. The inkjet component 42 in the plastic spraying and dyeing structure 4 is provided with an ink flow meter and a pressure differential sensor, which can accurately control the flow value to avoid burrs and ink dripping after the inkjet is completed. In addition, the drying structure 3 increases the drying effect through two heating dryings to prevent incomplete drying from affecting the pattern.

[0059] Furthermore, the nozzles 424 of the present application are arranged in a direction perpendicular to the second feed belt 422, and the ink is constrained by a scraper 427 to eliminate ink accumulation at the edge and increase the uniformity of the pattern after the inkjet coloring is completed. The height of the scraper 427 is adjustable to prevent the ink from exceeding the pattern of the coloring area. At the same time, the flow meter can detect the input flow at the nozzle 424 end in real time, and can automatically produce an ink replenishment strategy or a nozzle adjustment strategy according to the flow rate after detecting a flow abnormality. The pressure difference sensor can detect the internal and external pressure difference of the nozzle 424, thereby preventing the ink break problem caused by excessive internal and external pressure difference. The overall degree of automation is high, and the finished product of the inkjet coloring has a good effect.

[0060] At the same time, the corrugated cardboard needs to be flattened and adjusted before inkjet printing. During the adjustment process, the buffer layer 433 intelligently detects the contact status of the support layer 431 and the embossing layer 432 through the pressure sensor, so that when the pressure is greater than 0, it is judged that the current buffer layer 433 is in contact with the support layer 431 and the embossing layer 432, so that the support layer 431 can adjust the height of the embossing layer 432 through the buffer layer 433. The height adjustment parameters are detected by the displacement sensor, and the overall degree of automation is high. At the same time, the outer cover of the embossing roller is provided with a rubber film, which can flatten the corrugated cardboard without damaging the surface of the cardboard. At the same time, the rubber film has a large friction force, which can conveniently transmit the corrugated cardboard.

[0061] Moreover, in the process of inkjet coloring the corrugated cardboard, in order to prevent the change of flow from affecting the inkjet effect, specifically, by setting an ink flow meter at a position near the nozzle 424 in the ink channel 425, the ink flow can be detected in real time. When the ink in the liquid storage cylinder 426 is insufficient, the ink flow is too small, which will lead to uneven ink discharge and low ink droplet continuity, resulting in broken lines and virtual printing on the pattern on the corrugated cardboard, jagged edges and burrs on the pattern, and reduced performance of the pattern surface. On the contrary, if the opening at the nozzle 424 is too large, the ink flow on the opening side becomes larger, The service life of the nozzle 424 is shortened, resulting in waste of ink and increase of subsequent drying energy consumption, which increases the production cost. By dynamically monitoring the coloring channel 421 according to the detection flow, the qualified rate of the processing process is improved. At the same time, the pressure difference sensor can detect the internal and external pressure difference of the nozzle 424. If the pressure difference is too large, it will cause the ink drop shape to be out of control during the inkjet process. Generally speaking, when the pressure outside the nozzle 424 is greater than the pressure inside the nozzle 424, and the internal and external pressure difference is too large, the ink droplet ejection distance will be closer, making the color of the middle part of the pattern lighter, affecting the coloring effect. On the contrary, if the pressure inside the nozzle 424 is greater than the pressure outside the nozzle 424, and the pressure difference between the inside and outside is too large, the nozzle 424 will be damaged, the ink droplet diameter will increase, and the effect of the pattern will be affected. Moreover, after the inkjet coloring is completed, the printed pattern needs to be dried at the drying structure 3. At the heating component 31 of the drying structure 3, the heating roller 312 uses the temperature threshold of ink solidification as a reference to detect the temperature of the heating roller 312 in real time, and adjusts the power of the heating rod 311 based on the detected temperature. At the same time, the material of the heating roller 312 can preferably be silicon carbide ceramics. It has good thermal conductivity and can avoid thermal stress. It can prevent the color in the pattern from being taken away during the process of drying the pattern in contact with the pattern. The heating effect is good and the integrity of the pattern is protected. After the ink layer is penetrated and solidified by the heating roller 312, the pattern can maintain its basic shape and prevent the surface ink from being displaced and damaging the pattern during the subsequent blowing process. The hot air is sprayed through the air outlet rod 321 to achieve rapid surface shaping. At the same time, the heating roller 312 can detect the temperature and automatically adjust it after the temperature exceeds the limit to prevent insufficient heating and excessive heating.

[0062] As an optimization of the above scheme, in the process of detecting the coloring channel, when the present application detects a decrease in flow rate, the reason is that the impurity particles in the ink cause the nozzle to be blocked or the ink content in the liquid storage cylinder is insufficient. The device as a whole actively increases the flow rate in the ink channel to increase the pressure inside the nozzle, thereby clearing the blockage at the nozzle. Conversely, if the pressure of the nozzle does not change after the flow rate is increased, it means that the ink content in the liquid storage cylinder is insufficient, and the staff needs to manually add ink. At the same time, during the process of detecting the nozzle, the flow rate of the ink channel is directly proportional to the pressure inside the nozzle. Specifically, if the flow rate in the ink channel is too large, the ink flow rate is greater than the nozzle outlet flow rate, thereby increasing the pressure inside the nozzle. Conversely, if the flow rate in the ink channel is too small, the ink flow rate is less than the nozzle outlet flow rate, and the pressure inside the nozzle is small, resulting in a small amount of ink output from the nozzle, and unclear coloring of the corrugated cardboard. It is worth mentioning that if the pressure inside the nozzle continues to increase after the flow rate is increased, the flow rate in the ink channel is inversely proportional to the pressure inside the nozzle, indicating that the current nozzle is severely blocked and cannot be automatically adjusted by the device, and manual adjustment is required.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for inkjet coloring the surface of a corrugated cardboard box, comprising a support base (1), characterized in that: The support seat (1) is provided with a positioning structure (2), a drying structure (3) and a spray-dyeing structure (4) arranged between the positioning structure (2) and the drying structure (3); a transmission structure (5) is provided in the positioning structure (2) and the drying structure (3); the corrugated cardboard is circulated between the positioning structure (2), the drying structure (3) and the spray-dyeing structure (4) through the transmission structure (5); the spray-dyeing structure (4) comprises a coloring box (41), an inkjet assembly (42) arranged in the coloring box (41), a stamping assembly (43) and a first feeding belt (44) arranged at the bottom of the stamping assembly (43) and the inkjet assembly (42); The stamping assembly (43) comprises a support layer (431) arranged on the top of the coloring box (41), a stamping layer (432) arranged on the upper end of the first feeding belt (44), and a buffer layer (433) arranged between the support layer (431) and the stamping layer (432), wherein a gap is formed between the stamping layer (432) and the first feeding belt (44) for passing the corrugated cardboard board; Fixed plates (434) are provided at both ends of the support layer (431), the buffer layer (433) and the embossing layer (432). Adjacent fixed plates (434) abut against each other, and a servo motor (435) is provided on the fixed plate (434) corresponding to the support layer (431). The servo motor (435) is used to drive the fixed plate (434) to move in a vertical direction. A pressure sensor and a displacement sensor are provided on the fixed plate (434) corresponding to the buffer layer (433). An embossing roller is also provided in the fixed plate (434) corresponding to the embossing layer (432). A rubber film is provided on the outer side of the embossing roller, and the embossing roller is configured to rotate in the fixed plate (434).

2. The inkjet coloring device for the surface of a corrugated cardboard box according to claim 1, characterized in that: The inkjet assembly (42) includes a coloring channel (421) and a second feeding belt (422) arranged at the bottom of the coloring channel (421). An inkjet slot (423) is provided at the bottom of the coloring channel (421). A plurality of nozzles (424) are provided in the inkjet slot (423) along its length. An ink channel (425) is also provided in the coloring channel (421). One end of the ink channel (425) is connected to the nozzle (424), and the other end is provided with a liquid storage cylinder (426). Scrapers (427) are also provided at both ends of the inkjet slot (423) that are perpendicular to the movement direction of the second feeding belt (422). The scrapers (427) are configured to ensure the uniformity of coloring of the corrugated cardboard.

3. The inkjet coloring device for the surface of a corrugated cardboard box according to claim 2, characterized in that: The positioning structure (2) comprises a placement rack (21) arranged on a side away from the spray-dyeing structure (4) and a loading assembly (22) arranged on the placement rack (21); the loading assembly (22) comprises a measuring ruler (221) and limit blocks (222) arranged at both ends of the measuring ruler (221); the two limit blocks (222) can move toward or away from each other along the length direction of the measuring ruler (221).

4. The device for inkjet coloring the surface of a corrugated cardboard box according to claim 3, characterized in that: The transmission structure (5) is arranged on one side of the positioning structure (2), and the transmission structure (5) includes a plurality of transmission wheels (51) arranged at one end of the positioning structure (2), a transmission belt (52) arranged on the transmission wheel (51), and a plurality of pressing wheels (53) above the transmission belt (52), the position of each pressing wheel (53) matches the position of the transmission belt (52), and height adjustment members (54) are provided at both ends of the pressing wheel (53), and the height adjustment member (54) is configured to adjust the relative distance between the pressing wheel (53) and the transmission belt (52). A slider (55) is also provided between the height adjustment member (54) and the positioning structure (2), and the slider (55) is configured to control the pressing wheel (53) to move along the length direction of the positioning structure (2).

5. The device for inkjet coloring the surface of a corrugated cardboard box according to claim 4, characterized in that: The drying structure (3) comprises a heating component (31) arranged on a side close to the plastic spraying and dyeing structure (4) and a drying component (32) arranged on a side away from the plastic spraying and dyeing structure (4); the corrugated cardboard board moves between the heating component (31) and the drying component (32) via a transmission structure (5) in the drying structure (3).

6. The device for inkjet coloring the surface of a corrugated cardboard box according to claim 5, characterized in that: The heating assembly (31) comprises a heating rod (311) arranged at the upper end of the transmission structure (5) and a heating roller (312) sleeved on the outside of the heating rod (311); the drying assembly (32) comprises an air outlet rod (321) arranged at the upper end of the transmission structure (5) and a plurality of air outlets (322) uniformly arranged along the length direction of the air outlet rod (321).

7. A control method for the inkjet coloring device for the surface of a corrugated cardboard box according to claim 6, characterized in that: The following steps are involved: S1. Place the corrugated cardboard to be printed on a measuring ruler, and ensure that the central axis of the corrugated cardboard matches the center position of the measuring ruler; S2. Adjust the positions of the limit blocks at both ends of the measuring ruler so that the limit blocks respectively contact the two ends of the corrugated cardboard, and record the width of the corrugated cardboard displayed on the measuring ruler. Upload the corrugated cardboard width information to the spray-dyeing structure for information preprocessing; S3. Place the corrugated cardboard board on the positioning structure. At the same time, the pressing wheel at the positioning structure moves toward the corrugated cardboard board through the height adjustment member. When the pressing wheel detects that it is in contact with the corrugated cardboard board, the pressing wheel stops moving and records the thickness of the corrugated cardboard board. The thickness information is uploaded to the spray-dyeing structure for information preprocessing. S4, the pressing wheel moves along the length direction of the positioning structure through the slider, and at the same time the transmission belt of the transmission structure moves synchronously, driving the corrugated box board to move closer to the spray-dyeing mechanism; S5. The stamping assembly in the spray-dyeing mechanism adjusts its height. The fixed plate at the support layer adjusts the height of the support layer via a servo motor. At the same time, the pressure sensor at the buffer layer detects the pressures P1 and P2 at the upper and lower ends of the fixed plate of the buffer layer. If P1 = 0 or P2 = 0, it is determined that the current buffer layer does not conflict with the stamping layer or the support layer, and the support layer continues to move. Conversely, if both P1 and P2 are greater than 0, it is determined that both ends of the current buffer layer conflict with the stamping layer and the support layer, and the displacement sensor begins to record the movement distance of the buffer layer. S6. The displacement sensor calculates the movement distance of the buffer layer and determines the distance of the gap between the current embossing layer and the first feeding belt based on the movement distance, so that the distance of the gap matches the thickness of the corrugated box board; S7, after the printing assembly flattens the corrugated cardboard board, the corrugated cardboard board moves into the inkjet assembly and moves in the coloring channel through the second feeding belt, and the color is sprayed on the surface of the corrugated cardboard board in the coloring channel to complete the printing; S8. After the printing of the corrugated cardboard is completed, the heating rod of the drying structure heats the heating roller. The minimum drying and forming temperature of the ink is set to Tl and the maximum is set to Th. At the same time, the heating roller detects the current temperature. The detected temperature is T. If T < Tl or T > Th, it is determined that the current temperature of the heating roller does not meet the requirements. The temperature of the heating rod is adjusted to increase / decrease the temperature of the heating roller. Otherwise, it is determined that the current temperature of the heating roller meets the processing requirements. The colored corrugated cardboard is controlled to enter the drying structure. S9. After the heating rollers have finished heating and drying the corrugated cardboard board, the transmission structure at the bottom of the drying structure drives the corrugated cardboard board to continue moving, and dries the surface of the corrugated cardboard board through the drying components to complete the coloring process.

8. The control method of the device for inkjet coloring the surface of a corrugated cardboard box according to claim 7, characterized in that: The coloring channel is also provided with an ink flow meter and a pressure difference sensor. The ink flow meter is arranged in the ink channel near the nozzle, and the pressure difference sensor is arranged in the nozzle and is used to detect the pressure difference between the inside and outside of the nozzle hole. The corrugated cardboard coloring method of step S7 includes the following steps: S71, the inkjet slot performs inkjet coloring, and at the same time sets the flow threshold required for coloring the corrugated cardboard to Ll-Lm. During the inkjet process, the ink flow meter detects the ink flow in the ink channel, and the detection result is L. If L<Ll, it is judged that the current ink flow is too small, resulting in uneven coloring of the corrugated cardboard, and burrs appear on the edges of the lines after dyeing, and the liquid storage cylinder needs to be replenished with ink. If L>Lm, it is judged that the current ink flow is too large, resulting in excessive ink on the surface of the corrugated cardboard, which is prone to ink dripping, and the size of the nozzle needs to be adjusted. On the contrary, if Ll<L<Lm, it is judged that the flow is normal, and jump to S72 for pressure difference detection; S72. Set the initial detection values ​​of the pressure difference sensor inside and outside the nozzle to Pn and Pw. During the operation of the nozzle, the pressure difference inside and outside the nozzle during the inkjet process is detected by the pressure difference sensor, which are Pn1 and Pw1 respectively. If -0.35kPa>Pn1-Pw1>+0.35kPa, it is judged that the current pressure difference inside and outside the nozzle is too large, the device is stopped and the staff is notified for maintenance. On the contrary, if -0.35kPa<Pn1-Pw1<+0.35kPa, it is judged that the current device is operating normally.

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