Corrugated carton board surface ink-jet coloring device and control method thereof

Abstract

The invention discloses surface printing manufacturing equipment of a corrugated carton, and aims to provide a corrugated carton board surface ink-jet coloring device which is good in processing effect, high in processing automation degree and capable of automatically detecting and adjusting the ink outlet amount and a control method of the corrugated carton board surface ink-jet coloring device. The full-flow automatic processing of positioning of corrugated carton boards and finished products is realized, an ink outlet flow meter and a differential pressure sensor are arranged in an ink jet assembly in the plastic spraying and dyeing structure, the flow value can be accurately controlled, the problems of burrs and ink dripping after ink jet is completed are avoided, and in addition, the drying structure is heated and dried twice, so that the production efficiency is improved, and the production cost is reduced. And the drying effect is improved, the situation that the patterns are affected due to incomplete drying is prevented, and the corrugated carton drying device is suitable for the technical field of corrugated carton processing equipment.

Description

Technical Field

[0001] The present invention relates to a surface printing and manufacturing device for corrugated paper boxes. More specifically, it relates to an inkjet coloring device for the surface of corrugated paper box boards and a control method therefor. Background Art

[0002] For the surface coloring method of corrugated paper box boards on the market, multiple drive belts for driving are usually arranged in the printing part. The corrugated paper box boards enter the printing part through the drive belts, and in the printing part, a baffle is used to block to form a coloring area on the surface of the corrugated paper box boards, and inkjet coloring is performed on the coloring area to complete the pattern printing on the surface of the corrugated paper box boards. And an automatic feeding part is arranged at the front end of the printing part to realize the automatic feeding of the corrugated paper box boards, and a drying part is arranged at the rear end of the printing part to realize the rapid forming of the pattern.

[0003] In the above inkjet coloring process of corrugated paper box boards, the raw materials are prone to shift during the movement at the feeding structure, which causes the pattern to shift and the pattern to be missing during the inkjet printing process. At the same time, during the inkjet process of corrugated paper box boards, it is difficult to detect the ink output and ink pressure of the nozzle, which will result in poor inkjet finished product effect, waste of resources, and poor overall processing coherence. It is difficult to flatten the corrugated paper box boards before processing, which causes the pattern to shift. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an inkjet coloring device for the surface of corrugated paper box boards and a control method therefor, which have good processing effect, high processing automation degree, and can automatically detect and adjust the ink output.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An inkjet coloring device for the surface of corrugated paper box boards, including a support base, a positioning structure, a drying structure, and a spray coating and dyeing structure arranged between the positioning structure and the drying structure are provided on the support base. A transmission structure is arranged in the positioning structure and the drying structure. The corrugated paper box boards are circulated between the positioning structure, the drying structure, and the spray coating and dyeing structure through the transmission structure. The spray coating and dyeing structure includes a coloring box body, an inkjet component, an embossing component arranged in the coloring box body, and a first feeding belt arranged at the bottoms of the embossing component and the inkjet component.

[0006] The present invention is further configured that: the inkjet assembly includes a coloring channel and a second feeding belt disposed at the bottom of the coloring channel. An inkjet groove is formed at the bottom of the coloring channel. A plurality of nozzles are disposed along the length direction in the inkjet groove. An ink channel is further provided in the coloring channel. One end of the ink channel is connected to the nozzle, and a liquid storage cylinder is provided at the other end. Scrapers are further provided at both ends of the inkjet groove perpendicular to the moving direction of the second feeding belt. The scrapers are configured to ensure the uniformity of the coloring of the corrugated cardboard.

[0007] The present invention is further configured that: the embossing assembly includes a support layer disposed on the top of the coloring box body, an embossing layer disposed on the upper end of the first feeding belt, and a buffer layer disposed between the support layer and the embossing layer. A gap for passing the corrugated cardboard is formed between the embossing layer and the first feeding belt.

[0008] Preferably, fixing plates are provided at both ends of the support layer, the buffer layer, and the embossing layer. Adjacent fixing plates are in contact with each other. A servo motor is provided on the fixing plate corresponding to the support layer. The servo motor is used to drive the fixing plate to move in the vertical direction. A pressure sensor and a displacement sensor are provided on the fixing plate corresponding to the buffer layer. An embossing roller is further provided in the fixing plate corresponding to the embossing layer. A rubber film is provided on the outer side of the embossing roller. And the embossing roller is configured to rotate within the fixing plate.

[0009] The present invention is further configured that: the positioning structure includes a placement rack disposed on the side away from the spraying and dyeing structure and a loading assembly disposed on the placement rack. The loading assembly includes a measuring scale and limit blocks disposed at both ends of the measuring scale. The two limit blocks can move closer to / away from each other along the length direction of the measuring scale.

[0010] Preferably, the transmission structure is disposed on one side of the positioning structure and includes a plurality of transmission wheels disposed at one end of the positioning structure, a transmission belt disposed on the transmission wheels, and a plurality of pressure rollers above the transmission belt. The positions of the pressure rollers match the position of the transmission belt. Height adjusting members are further provided at both ends of the pressure rollers. The height adjusting members are configured to adjust the relative distance between the pressure rollers and the transmission belt. A slider is further provided between the height adjusting members and the positioning structure. The slider is configured to control the movement of the pressure rollers along the length direction of the positioning structure.

[0011] The present invention is further configured that: the drying structure includes a heating assembly disposed on the side close to the spraying and dyeing structure and a drying assembly disposed on the side away from the spraying and dyeing structure. The corrugated cardboard moves between the heating assembly and the drying assembly through the transmission structure in the drying structure.

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

[0013] The present application also provides a control method for an inkjet coloring device on the surface of a corrugated cardboard box, including the following steps: S1. Place the corrugated cardboard to be printed on the measuring scale, and make: the central axis of the corrugated cardboard match the central position of the measuring scale; S2. Adjust the positions of the limit blocks at both ends of the measuring scale so that the limit blocks respectively abut against both ends of the corrugated cardboard, record the width of the corrugated cardboard displayed on the measuring scale, and upload the corrugated cardboard width information to the inside of the powder spraying and dyeing structure for information preprocessing; S3. Place the corrugated cardboard box on the positioning structure, and at the same time, the pressing wheel at the positioning structure moves towards the corrugated cardboard box through the height adjusting member. When the pressing wheel detects that it is in contact with the corrugated cardboard box, the pressing wheel stops moving and records the thickness of the corrugated cardboard box, and uploads the thickness information to the inside of the powder spraying and 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 cardboard box to move towards the powder spraying and dyeing mechanism; S5. The height of the pressing component in the powder spraying and dyeing mechanism is adjusted. The fixing plate at the support layer adjusts the height of the support layer through the servo motor. At the same time, the pressure sensors at the buffer layer detect the pressures P1 and P2 received at the upper and lower ends of the buffer layer fixing plate. If P1 = 0 or P2 = 0, it is determined that the current buffer layer is not in contact with the pressing layer or the support layer, and the support layer continues to move. On the contrary, if both P1 and P2 are > 0, it is determined that both ends of the current buffer layer are in contact with the pressing layer and the support layer, and the displacement sensor starts to record the moving distance of the buffer layer; S6. The displacement sensor calculates the moving distance of the buffer layer, and based on the moving distance, determines the distance between the current pressing layer and the first feeding belt, so that the distance of the gap matches the thickness of the corrugated cardboard box; S7. After the pressing component flattens the corrugated cardboard box, the corrugated cardboard box moves into the inkjet component and moves in the coloring channel through the second feeding belt, and sprays the color on the surface of the corrugated cardboard box in the coloring channel to complete the printing; S8. After the corrugated cardboard is printed, 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 Th. At the same time, the heating roller detects the current temperature, and 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, and 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, and the corrugated cardboard with coloring completed is controlled to enter the drying structure; S9. After the heating roller finishes heating and drying the corrugated cardboard, the transmission structure at the bottom of the drying structure drives the corrugated cardboard to continue moving, and the surface of the corrugated cardboard is dried by the drying component to complete the coloring process.

[0014] Preferably, an ink flowmeter and a differential pressure sensor are further provided in the coloring channel. The ink flowmeter is arranged in the ink channel near the nozzle, and the differential pressure sensor is arranged in the nozzle and used to detect the pressure difference inside and outside the nozzle holes. The corrugated cardboard coloring method in step S7 includes the following steps: S71. The inkjet tank performs inkjet coloring. At the same time, the flow threshold required for coloring the corrugated cardboard is set to Ll - Lm. During the inkjet process, the ink flowmeter detects the ink flow in the ink channel, and the detection result is L. If L < Ll, it is determined that the current ink flow is too small, resulting in uneven coloring of the corrugated cardboard and burrs appearing at the edges of the dyed lines, and the ink reservoir needs to be replenished with ink. If L > Lm, it is determined that the current ink flow is too large, resulting in too much ink on the surface of the corrugated cardboard and easy occurrence of ink dripping, and the size at the nozzle needs to be adjusted. Otherwise, if Ll < L < Lm, it is determined that the flow is normal, and it jumps to S72 for differential pressure detection; S72. The initial detection values of the differential pressure sensor inside and outside the nozzle are set to Pn and Pw. During the operation of the nozzle, the differential pressure sensor detects the pressure difference inside and outside the nozzle during the inkjet process, which are Pn1 and Pw1 respectively. If -0.35 kPa > Pn1 - Pw1 > +0.35 kPa, it is determined that the current pressure difference inside and outside the nozzle is too large, and the device stops and notifies the staff for maintenance. Otherwise, if -0.35 kPa < Pn1 - Pw1 < +0.35 kPa, it is determined that the current device is operating normally.

[0015] By adopting the above technical solutions, the beneficial effects are as follows: 1. Through positioning, embossing, inkjet printing, and drying, the present application realizes the full-process automation of the processing from the positioning of corrugated cardboard to the finished product. Specifically, through the linkage of the adjustable limit blocks and measuring rulers in the positioning mechanism, the width and thickness data of the cardboard can be automatically collected and uploaded for preprocessing, preventing errors caused by manual measurement. At the same time, in the embossing assembly, the lifting of the support layer is driven by a servo motor to adjust the gap between the embossing layer and the first feeding belt, enabling the embossing assembly to dynamically adapt to corrugated cardboard of different thicknesses. At the same time, the buffer layer feeds back in real time through pressure sensors and displacement sensors, ensuring the precise matching of the flattening force and the cardboard thickness. In the inkjet spraying and dyeing structure, the inkjet assembly is provided with an ink output flowmeter and a differential pressure sensor, which can accurately control the flow value, avoiding problems such as burrs and ink dripping after inkjet printing. Moreover, the drying structure increases the drying effect through two-stage heating and drying, preventing incomplete drying from affecting the pattern. <(0000043)>2. Further, the nozzles of the present application are arranged in a direction perpendicular to the second feeding belt, and the ink is restricted by a squeegee to eliminate the accumulation of ink at the edges, increasing the uniformity of the pattern after inkjet coloring. Moreover, the height of the squeegee is adjustable to prevent the ink from exceeding the pattern in the coloring area. At the same time, the flowmeter can detect the input flow at the nozzle end in real time, and can automatically generate a supplementary ink strategy or a nozzle adjustment strategy according to the flow rate after detecting abnormal flow. The differential pressure sensor can detect the internal and external pressure difference of the nozzle, thereby preventing the problem of ink breakage caused by excessive internal and external pressure difference. The overall automation degree is high, and the finished product effect of inkjet coloring is good.

[0017] 3. At the same time, before inkjet printing, the corrugated cardboard needs to be flattened and adjusted. During the adjustment process, the buffer layer intelligently detects the contact state between the support layer and the embossing layer through a pressure sensor. When the pressure > 0, it is determined that the current buffer layer is in contact with the support layer and the embossing layer, enabling the support layer to adjust the height of the embossing layer through the buffer layer. The height adjustment parameters are detected by a displacement sensor. The overall automation degree is high. At the same time, the outer sleeve of the embossing roller is provided with a rubber film, which can flatten the corrugated cardboard without damaging the cardboard surface. At the same time, the rubber film has a large friction force, which can facilitate the transmission of the corrugated cardboard.

[0018] It should be noted that in the original text, the tag

[0016] seems to be wrongly written as <(0000043)> in the translation. It is recommended to check and correct the original text if necessary.4. Also, during the inkjet coloring process of corrugated cardboard, to prevent the change in flow rate from affecting the inkjet effect, specifically, an ink flowmeter is set at a position near the nozzle in the ink channel to detect the ink flow rate in real time. When the ink in the liquid storage cylinder is insufficient and the ink flow rate is too small, it will cause uneven ink output, low droplet continuity, resulting in problems such as broken lines and ghosting in the pattern on the corrugated cardboard, sawtooth and burrs at the edge of the pattern, and at the same time, it will reduce the surface performance of the pattern. On the contrary, if the opening at the nozzle is too large, the ink flow rate on the opening side will increase, shortening the nozzle life, causing waste of ink and increasing the subsequent drying energy consumption, thus increasing the production cost. By dynamically monitoring the coloring channel according to the detected flow rate, the qualified rate of the processing process is improved. At the same time, the differential pressure sensor can detect the pressure difference between the inside and outside of the nozzle. If the pressure difference is too large, it will cause the loss of control of the droplet 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 relatively short, making the color in the middle part of the pattern lighter and 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, increasing the ink droplet diameter and affecting the pattern effect. Also, 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 takes the temperature threshold for ink curing as a reference, detects the temperature of the heating roller in real time, and adjusts 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 a good thermal conductivity coefficient and can avoid thermal stress. During the process of drying the pattern in contact with the pattern, it can prevent the color in the pattern from being taken away, has a good heating effect, and protects the integrity of the pattern. After the ink layer penetration and curing are completed by the heating roller, the pattern can maintain its basic shape, preventing the surface ink from being displaced during the subsequent blowing process and damaging the pattern. The surface is quickly shaped by spraying hot air through the air outlet rod. At the same time, the heating roller can detect the temperature and automatically adjust after the temperature exceeds the limit, preventing problems such as insufficient heating and overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a specific structural diagram of an embodiment of an inkjet coloring device and its control method for the surface of a corrugated cardboard according to the present invention; Figure 2 FIG. is a specific structural diagram of a positioning structure of an embodiment of an inkjet coloring device and its control method for the surface of a corrugated cardboard according to the present invention; Figure 3 FIG. is a specific structural diagram of a plastic spraying and dyeing structure of an embodiment of an inkjet coloring device and its control method for the surface of a corrugated cardboard according to the present invention; Figure 4Schematic diagram of the specific structure of the drying structure of an inkjet coloring device for the surface of a corrugated cardboard box and its control method according to an embodiment of the present invention; Figure 5 Schematic diagram of the specific structure of the coloring channel of an inkjet coloring device for the surface of a corrugated cardboard box and its control method according to an embodiment of the present invention; Figure 6 Flowchart of the control method of an inkjet coloring device for the surface of a corrugated cardboard box and its control method according to an embodiment of the present invention; Figure 7 Flowchart of the inkjet coloring method of an inkjet coloring device for the surface of a corrugated cardboard box and its control method according to an embodiment of the present invention; Reference numerals in the figure: 1, support base; 2, positioning structure; 21, placement rack; 22, loading component; 221, measuring scale; 222, limiting block; 3, drying structure; 31, heating component; 311, heating rod; 312, heating roller; 32, drying component; 321, air outlet rod; 322, air outlet; 4, spray coating and dyeing structure; 41, coloring box body; 42, inkjet component; 421, coloring channel; 422, second feeding belt; 423, inkjet tank; 424, nozzle; 425, ink channel; 426, liquid storage cylinder; 427, scraper; 43, embossing component; 431, support layer; 432, embossing layer; 433, buffer layer; 434, fixing plate; 435, servo motor; 44, first feeding belt; 5, transmission structure; 51, transmission wheel; 52, transmission belt; 53, pressing wheel; 54, height adjusting part; 55, slider. Detailed implementation manners

[0020] Refer to Figures 1 to 7 To further illustrate an embodiment of an inkjet coloring device for the surface of a corrugated cardboard box and its control method of the present invention.

[0021] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right", etc. are used in the embodiments to describe the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations during the use or operation of the device. For example, if the device in the figure is inverted, the element described as being "below" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "lower" 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 correspondingly interpreted.

[0022] Moreover, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0023] A surface inkjet coloring device for corrugated cardboard boxes, including a support base 1, on which a positioning structure 2, a drying structure 3, and a spray coating and dyeing structure 4 arranged between the positioning structure 2 and the drying structure 3 are provided. A transmission structure 5 is arranged in the positioning structure 2 and the drying structure 3. The corrugated cardboard box is circulated between the positioning structure 2, the drying structure 3, and the spray coating and dyeing structure 4 through the transmission structure 5. The spray coating and dyeing structure 4 includes a coloring box body 41, an inkjet component 42 arranged in the coloring box body 41, an embossing component 43, and a first feeding belt 44 arranged at the bottom of the embossing component 43 and the inkjet component 42.

[0024] The inkjet component 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 along the length direction in the inkjet groove 423. An ink channel 425 is further arranged in the coloring channel 421. One end of the ink channel 425 is connected to the nozzle 424, and a liquid storage cylinder 426 is arranged at the other end. Scrapers 427 are also arranged at both ends of the inkjet groove 423 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 box.

[0025] The embossing component 43 includes a support layer 431 arranged on the top of the coloring box body 41, an embossing 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 embossing layer 432. A gap for passing the corrugated cardboard box is formed between the embossing layer 432 and the first feeding belt 44.

[0026] Preferably, fixing plates 434 are arranged at both ends of the support layer 431, the buffer layer 433, and the embossing layer 432. Adjacent fixing plates 434 are in contact with each other. A servo motor 435 is arranged on the fixing plate 434 corresponding to the support layer 431. The servo motor 435 is used to drive the fixing plate 434 to move in the vertical direction. A pressure sensor and a displacement sensor are arranged on the fixing plate 434 corresponding to the buffer layer 433. An embossing roller is further arranged in the fixing plate 434 corresponding to the embossing layer 432. A rubber film is arranged on the outside of the embossing roller, and the embossing roller is configured to rotate in the fixing plate 434.

[0027] The positioning structure 2 includes a placement rack 21 arranged on the side far from the spray coating and dyeing structure 4 and a feeding component 22 arranged on the placement rack 21. The feeding component 22 includes a measuring scale 221 and limit blocks 222 arranged at both ends of the measuring scale 221. The two limit blocks 222 can move closer to / away from each other along the length direction of the measuring scale 221.

[0028] Preferably, the transmission structure 5 is arranged on one side of the positioning structure 2, including a plurality of transmission wheels 51 arranged at one end of the positioning structure 2, a transmission belt 52 arranged on the transmission wheels 51, and a plurality of pressure rollers 53 above the transmission belt 52. The positions of the pressure rollers 53 match the position of the transmission belt 52. Height adjusting members 54 are further provided at both ends of the pressure rollers 53. The height adjusting members 54 are configured to adjust the relative distance between the pressure rollers 53 and the transmission belt 52. A slider 55 is further provided between the height adjusting members 54 and the positioning structure 2. The slider 55 is configured to control the movement of the pressure rollers 53 along the length direction of the positioning structure 2.

[0029] The drying structure 3 includes a heating component 31 arranged on the side close to the spray coating and dyeing structure 4 and a drying component 32 arranged on the side far from the spray coating and dyeing structure 4. The corrugated cardboard moves between the heating component 31 and the drying component 32 through the transmission structure 5 in the drying structure 3.

[0030] 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 outside the heating rod 311. 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 uniformly arranged along the length direction of the air outlet rod 321.

[0031] The present application also provides a control method for an inkjet coloring device on the surface of a corrugated cardboard, including the following steps: S1. Place the corrugated cardboard to be printed on the measuring scale, and make: the central axis of the corrugated cardboard match the central position of the measuring scale; S2. Adjust the positions of the limit blocks at both ends of the measuring scale so that the limit blocks respectively abut against both ends of the corrugated cardboard, record the width of the corrugated cardboard displayed on the measuring scale, and upload the corrugated cardboard width information to the inside of the spray coating and dyeing structure for information preprocessing; S3. Place the corrugated cardboard at the positioning structure. At the same time, the pressure rollers at the positioning structure move towards the corrugated cardboard through the height adjusting members. When the pressure rollers detect that they are in contact with the corrugated cardboard, the pressure rollers stop moving and record the thickness of the corrugated cardboard, and upload the thickness information to the inside of the spray coating and dyeing structure for information preprocessing; S4. The pressure rollers move 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 cardboard to move towards the spray coating and 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.

[0032] 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; 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.

[0033] 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.

[0034] 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.

[0035] Meanwhile, before inkjet printing, the corrugated cardboard needs to be flattened and adjusted. During the adjustment process, the buffer layer 433 intelligently detects the contact state between the support layer 431 and the imprinting layer 432 through a pressure sensor. When the pressure > 0, it is determined that the current buffer layer 433 is in contact with the support layer 431 and the imprinting layer 432, so that the support layer 431 can adjust the height of the imprinting layer 432 through the buffer layer 433. The height adjustment parameter is detected by a displacement sensor, and the overall degree of automation is high. At the same time, a rubber film is sleeved outside the imprinting roller, 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.

[0036] Moreover, during the inkjet coloring process of corrugated cardboard, to prevent the influence of flow rate changes on the inkjet effect, specifically, an ink flowmeter is set at a position near the nozzle 424 in the ink channel 425 to detect the ink flow rate in real time. When the ink in the liquid storage cylinder 426 is insufficient, the ink flow rate is too small, which will cause uneven ink output, low droplet continuity, resulting in problems such as broken lines and ghosting in the pattern on the corrugated cardboard, serrations and burrs at the edge of the pattern, and at the same time, it will reduce the surface performance of the pattern. On the contrary, if the opening at the nozzle 424 is too large, the ink flow rate on the opening side will increase, shortening the life of the nozzle 424, causing waste of ink and an increase in subsequent drying energy consumption, increasing the production cost. By dynamically monitoring the coloring channel 421 according to the detected flow rate, 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 424. If the differential pressure is too large, it will cause the loss of control of the droplet shape 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 differential pressure is too large, the ink droplet ejection distance will be relatively short, making the color in the middle part of the pattern lighter and 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 internal and external differential pressure is too large, it will cause damage to the nozzle 424, increasing the ink droplet diameter and affecting the pattern effect. 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 takes the temperature threshold for ink curing as a reference, detects 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 be preferably silicon carbide ceramic, which has good thermal conductivity and can avoid thermal stress. During the process of drying the pattern in contact with the pattern, it can prevent the color in the pattern from being carried away, with good heating effect and protecting the integrity of the pattern. After the ink layer penetration and curing are completed by the heating roller 312, the pattern can maintain its basic shape, preventing the surface ink from being displaced during the subsequent blowing process and damaging the pattern. The surface is quickly shaped by spraying hot air through the air outlet rod 321. At the same time, the heating roller 312 can detect the temperature and automatically adjust after the temperature exceeds the limit, preventing problems such as insufficient heating and overheating.

[0037] As an optimization of the above solution, during the detection of the coloring channel, when a decrease in flow rate is detected, if the cause is blockage of the nozzle due to impurity particles in the ink or insufficient ink content in the liquid storage cylinder, the device 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 increasing the flow rate, it indicates 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 detection of the nozzle, the flow rate of the ink channel is in a proportional relationship with the pressure inside the nozzle. Specifically, if the flow rate in the ink channel is too large, such that the ink flow rate > the nozzle liquid outlet flow rate, and further causes the pressure inside the nozzle to increase. Conversely, if the flow rate of the ink channel is too small, then the ink flow rate < the nozzle liquid outlet flow rate, and the pressure inside the nozzle is small, which will result in a small amount of ink output at the nozzle and unclear coloring of the corrugated cardboard. It is worth mentioning that if the pressure inside the nozzle continues to increase after increasing the flow rate, and at this time the flow rate of the ink channel is inversely proportional to the pressure inside the nozzle, it indicates that the blockage at the current nozzle is serious and cannot be automatically adjusted and processed by the device, and manual adjustment is required.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any ordinary 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. An inkjet coloring device for the surface of a corrugated cardboard box, comprising a support base (1), characterized in that, A positioning structure (2), a drying structure (3), and a powder coating and dyeing structure (4) disposed between the positioning structure (2) and the drying structure (3) are provided on the support base (1). A transmission structure (5) is provided inside 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 powder coating and dyeing structure (4) through the transmission structure (5). The powder coating and dyeing structure (4) includes a coloring box body (41), an inkjet component (42) disposed inside the coloring box body (41), an embossing component (43), and a first feeding belt (44) disposed at the bottoms of the embossing component (43) and the inkjet component (42).

2. The surface inkjet coloring device for corrugated cardboard according to claim 1, wherein The inkjet component (42) includes a coloring channel (421) and a second feeding belt (422) disposed at the bottom of the coloring channel (421). An inkjet groove (423) is formed at the bottom of the coloring channel (421). A plurality of nozzles (424) are disposed along the length direction of the inkjet groove (423). An ink channel (425) is further provided inside the coloring channel (421). One end of the ink channel (425) is connected to the nozzle (424), and a liquid storage cylinder (426) is provided at the other end. Scrapers (427) are further provided at both ends of the inkjet groove (423) perpendicular to the moving direction of the second feeding belt (422). The scrapers (427) are configured to ensure the uniformity of the coloring of the corrugated cardboard.

3. The surface inkjet coloring device for corrugated cardboard according to claim 1, characterized in that, The embossing component (43) includes a support layer (431) disposed on the top of the coloring box body (41), an embossing layer (432) disposed on the upper end of the first feeding belt (44), and a buffer layer (433) disposed between the support layer (431) and the embossing layer (432). A gap for passing the corrugated cardboard is formed between the embossing layer (432) and the first feeding belt (44).

4. An inkjet coloring device for the surface of a corrugated cardboard box according to claim 3, characterized in that, Fixing plates (434) are provided at both ends of the support layer (431), the buffer layer (433), and the embossing layer (432). Adjacent fixing plates (434) are in contact with each other. A servo motor (435) is provided on the fixing plate (434) corresponding to the support layer (431). The servo motor (435) is used to drive the fixing plate (434) to move in the vertical direction. A pressure sensor and a displacement sensor are provided on the fixing plate (434) corresponding to the buffer layer (433). An embossing roller is further provided inside the fixing plate (434) corresponding to the embossing layer (432). A rubber film is provided on the outer side of the embossing roller. The embossing roller is configured to rotate inside the fixing plate (434).

5. A corrugated cardboard surface inkjet coloring device according to claim 1, characterized in that, The positioning structure (2) includes a placement rack (21) disposed on the side away from the powder coating and dyeing structure (4) and a feeding component (22) disposed on the placement rack (21). The feeding component (22) includes a measuring scale (221) and limit blocks (222) disposed at both ends of the measuring scale (221). The two limit blocks (222) can move closer to / away from each other along the length direction of the measuring scale (221).

6. The surface inkjet coloring device for corrugated cardboard according to claim 5, characterized in that, The transmission structure (5) is arranged on one side of the positioning structure (2), including a plurality of transmission wheels (51) arranged at one end of the positioning structure (2), a transmission belt (52) arranged on the transmission wheels (51), and a plurality of pressure rollers (53) above the transmission belt (52). The positions of the pressure rollers (53) match the position of the transmission belt (52). Height adjusting members (54) are further provided at both ends of the pressure rollers (53). The height adjusting members (54) are configured to adjust the relative distance between the pressure rollers (53) and the transmission belt (52). A slider (55) is further provided between the height adjusting members (54) and the positioning structure (2). The slider (55) is configured to control the movement of the pressure rollers (53) along the length direction of the positioning structure (2).

7. A corrugated cardboard surface inkjet coloring device according to claim 1, characterized in that, The drying structure (3) includes a heating component (31) arranged on one side close to the spray coating and dyeing structure (4) and a drying component (32) arranged on one side far from the spray coating and dyeing structure (4). The corrugated cardboard moves between the heating component (31) and the drying component (32) through the transmission structure (5) inside the drying structure (3).

8. An inkjet coloring device for the surface of a corrugated cardboard box according to claim 7, characterized in that, 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 outside the heating rod (311). 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) uniformly arranged along the length direction of the air outlet rod (321).

9. A control method for an inkjet coloring device on the surface of a corrugated cardboard box board according to any one of claims 1-8, characterized in that, Including the following steps: S1. Place the corrugated cardboard to be printed on the measuring scale and make: the central axis of the corrugated cardboard match the central position of the measuring scale; S2. Adjust the positions of the limit blocks at both ends of the measuring scale so that the limit blocks respectively abut against both ends of the corrugated cardboard, record the width of the corrugated cardboard shown on the measuring scale, and upload the corrugated cardboard width information to the inside of the spray coating and dyeing structure for information preprocessing; S3. Place the corrugated cardboard at the positioning structure. At the same time, the pressure rollers at the positioning structure move towards the corrugated cardboard through the height adjusting members. When the pressure rollers detect that they are in contact with the corrugated cardboard, the pressure rollers stop moving and record the thickness of the corrugated cardboard, and upload the thickness information to the inside of the spray coating and dyeing structure for information preprocessing; S4. The pressure rollers move 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 cardboard to move towards the spray coating and dyeing mechanism; S5. Adjust the height of the embossing component in the spray coating and dyeing mechanism. The fixing plate at the support layer adjusts the height of the support layer through the servo motor. At the same time, the pressure sensors at the buffer layer detect the pressures P1 and P2 received at the upper and lower ends of the buffer layer fixing plate. If P1 = 0 or P2 = 0, it is determined that the current buffer layer is not in contact with the embossing layer or the support layer, and the support layer continues to move. On the contrary, if both P1 and P2 are > 0, it is determined that both ends of the current buffer layer are in contact with the embossing layer and the support layer, and the displacement sensor starts to record the moving distance of the buffer layer; S6. The displacement sensor calculates the moving distance of the buffer layer, and based on the moving distance, determines the distance between the current embossing layer and the first feeding belt, so that the distance of the gap matches the thickness of the corrugated cardboard; S7. After the embossing component flattens the corrugated cardboard, the corrugated cardboard moves into the inkjet component and moves in the coloring channel through the second feeding belt. Ink is sprayed on the surface of the corrugated cardboard in the coloring channel to complete printing; S8. After the corrugated cardboard is printed, the heating rod of the drying structure heats the heating roller. The drying and forming temperature of the ink is set to be at least Tl and at most Th. At the same time, the heating roller detects the current temperature, and 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, and 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, and the corrugated cardboard with coloring completed is controlled to enter the drying structure; S9. After the heating roller heats and dries the corrugated cardboard, the transmission structure at the bottom of the drying structure drives the corrugated cardboard to continue moving, and the surface of the corrugated cardboard is dried by the drying component to complete the coloring process.

10. The control method of an inkjet coloring device for the surface of a corrugated cardboard box according to claim 9, characterized in that, An ink flowmeter and a differential pressure sensor are also provided in the coloring channel. The ink flowmeter is arranged in the ink channel near the nozzle, and the differential pressure sensor is arranged in the nozzle and is used to detect the pressure difference inside and outside the spray holes. The method for coloring the corrugated cardboard in step S7 includes the following steps: S71. The inkjet tank performs inkjet coloring. At the same time, the flow threshold required for coloring the corrugated cardboard is set to Ll - Lm. During the inkjet process, the ink flowmeter detects the ink flow in the ink channel, and the detection result is L. If L < Ll, it is determined that the current ink flow is too small, resulting in uneven coloring of the corrugated cardboard and burrs appearing at the edges of the dyed lines, and the liquid storage cylinder needs to be replenished with ink. If L > Lm, it is determined that the current ink flow is too large, resulting in too much ink on the surface of the corrugated cardboard and easy ink dripping, and the size at the nozzle needs to be adjusted. Otherwise, if Ll < L < Lm, it is determined that the flow is normal, and it jumps to S72 for differential pressure detection; S72. The initial detection values of the differential pressure sensor inside and outside the nozzle are set to Pn and Pw. During the operation of the nozzle, the differential pressure sensor detects the pressure difference inside and outside the nozzle during the inkjet process, which are Pn1 and Pw1 respectively. If -0.35 kPa > Pn1 - Pw1 > +0.35 kPa, it is determined that the current pressure difference inside and outside the nozzle is too large, and the device stops and notifies the staff for maintenance. Otherwise, if -0.35 kPa < Pn1 - Pw1 < +0.35 kPa, it is determined that the current device is operating normally.

Images