An ink supply device and an ink supply control method

Abstract

This invention relates to the field of printing equipment technology, and discloses an ink supply device and ink supply control method, comprising: a frame; an ink delivery roller rotatably mounted on the frame, the surface of the ink delivery roller abutting against the surface of an engraving roller; an ink trough disposed below the ink delivery roller; a pre-scraping assembly disposed on the ink outlet side in the rotation direction of the ink delivery roller, the pre-scraping assembly including a pre-scraping blade and a gap adjustment part, the pre-scraping blade being located above the ink trough, the gap between the pre-scraping blade and the ink delivery roller being adjusted by the gap adjustment part; an ink supply assembly including an ink supply pump and a liquid level detector, the ink supply pump being connected to the ink trough, the liquid level detector being disposed on the ink trough; and a control assembly connected to the ink supply pump and the liquid level detector. This invention enables pre-adjustment of the ink layer thickness on the ink delivery roller, suppressing ink splattering and splashing, reducing ink waste and solvent evaporation; the liquid level detector and the control assembly work together to adjust the ink supply amount, achieving stable and continuous ink supply and ensuring the quality of the printed product.

Description

Technical Field

[0001] This invention relates to the field of printing equipment technology, and in particular to an ink supply device and ink supply control method. Background Technology

[0002] During the operation of gravure printing equipment, a continuous and stable supply of ink is the foundation for ensuring printing quality and production continuity. Existing ink supply methods usually adopt an open-loop logic: the ink supply power source delivers ink from the ink storage tank to the ink trough, and the ink delivery roller carries ink from the ink trough during rotation and further transfers it to the engraving roller.

[0003] However, in actual industrial production, the above ink supply mode has the following technical problems: First, the existing inking roller transfers ink to the engraving roller with a thickness far exceeding the printing requirements, resulting in a large amount of backflow ink scraped off by the printing doctor blade. This leads to a circulating ink volume and ink splashing that far exceed the ink requirements of the printing plate, and causes more solvent evaporation. Second, when the existing inking roller transfers ink to the printing plate roller, ink adheres to both ends of the roller's diameter, causing severe ink splashing on the roller's end faces and resulting in more solvent evaporation. Summary of the Invention

[0004] The purpose of this invention is to provide an ink supply device and ink supply control method that can pre-adjust the ink layer thickness on the ink delivery side of the ink delivery roller through a pre-scraping ink component, reduce redundant ink on the surface of the ink delivery roller, thereby controlling the amount of ink delivered to the engraving roller, suppressing ink splattering and splashing, reducing ink waste and solvent evaporation; through real-time feedback linkage between the liquid level detector and the control component, the ink supply amount can be adjusted to ensure that the ink level in the ink tank is always in a dynamic balance, avoiding overflow due to excessive liquid level or uneven ink reception due to excessive liquid level, achieving highly stable continuous ink supply, and ensuring the quality of printed products.

[0005] To achieve the above objectives, a first aspect of the present invention provides an ink supply device for use on an engraving roller of a printing equipment, comprising: frame; An ink delivery roller is rotatably mounted on the frame, and the surface of the ink delivery roller abuts against the surface of the engraving concave roller. An ink trough is disposed below the ink delivery roller; A pre-scraping ink assembly is disposed on the ink outlet side of the ink delivery roller in the rotation direction. The pre-scraping ink assembly includes a pre-scraping ink blade and a gap adjustment part. The pre-scraping ink blade is located above the ink trough, and the blade tip of the pre-scraping ink blade faces the ink delivery roller so that the scraped ink flows back into the ink trough. The gap between the pre-scraping ink blade and the ink delivery roller is adjusted by the gap adjustment part. An ink supply assembly, comprising an ink supply pump and a liquid level detector, wherein the ink supply pump is connected to the ink tank and the liquid level detector is disposed on the ink tank for detecting the liquid level of ink in the ink tank; A control component, which is electrically connected to the ink supply pump and the liquid level detector.

[0006] Furthermore, the pre-scraping ink assembly also includes a guide plate, which is disposed below the pre-scraping ink blade, and the guide surface of the guide plate is inclined to guide the ink trough.

[0007] Furthermore, the pre-scraping assembly also includes a blade holder, on which the pre-scraping blade is mounted, the guide plate is disposed on the blade holder, the blade holder is slidably disposed on the frame, and the power output end of the gap adjustment part is connected to the blade holder for driving the blade holder to slide.

[0008] Furthermore, the ink supply device also includes a height adjustment component, which includes a support rack, an adjustment gear, and an adjustment motor. The support rack extends vertically, and its top end is connected to the bottom of the ink trough. The adjustment gear meshes with the support rack, and the power output end of the adjustment motor is connected to the adjustment gear to drive the adjustment gear to rotate.

[0009] A second aspect of the present invention provides an ink supply control method applied to the ink supply device, comprising the following steps: S1. Obtain the real-time operating speed and ink consumption of the printing equipment, and obtain the real-time ink level in the ink tank through the liquid level detector; S2. The control component dynamically adjusts the displacement of the ink supply pump according to the real-time operating speed, the ink consumption of the printing equipment, and the real-time ink level, so as to maintain the depth of the ink delivery roller immersed in the ink in the ink tank within a preset depth range.

[0010] Further, S2 includes the step S21 of dynamically adjusting the displacement of the ink supply pump: S21. Calculate the current ink immersion depth of the ink delivery roller, compare the depth value with a preset first threshold and a second threshold, wherein the second threshold is greater than the first threshold, and the first threshold and the second threshold define a normal ink immersion range; when the depth value is within the normal ink immersion range, calculate the target rotation speed of the ink supply pump, and control the ink supply pump to run at the target rotation speed; when the depth value is greater than the second threshold, determine that there is excessive ink in the ink tank, calculate the target rotation speed of the ink supply pump, and control the ink supply pump to run at the target rotation speed.

[0011] Furthermore, S2 also includes a follow-up control step S22 when the printing equipment is running at a non-uniform speed: S22, when the depth value is within the normal ink immersion range, the real-time operating speed of the printing equipment is obtained and compared with a preset stable operating speed to determine whether it is in a variable operating condition stage of preparing to accelerate or decelerate; if so, in order to avoid the ink supply quantity from lagging during the variable operating condition, the control component calculates the target ink supply speed required by the ink supply pump based on the target rotation speed of the printing equipment after the variable operating condition and the preset transition time, thereby controlling the ink supply pump to accelerate or decelerate smoothly.

[0012] Furthermore, the ink supply control method also includes S3; S3. Based on the remaining length of the printing roll and the real-time operating speed of the printing equipment, calculate the first remaining operating time required for the printing equipment to complete the current printing work order; calculate the second remaining operating time that the current amount of ink in the ink tank can sustain. Compare the first remaining running time with the second remaining running time; when the first remaining running time is less than or equal to the second remaining running time, control the ink supply pump to stop supplying ink, and control the regulating motor to drive the support rack to lift the ink trough at a preset rising speed to maintain the ink immersion depth of the ink delivery roller; When the first remaining running time is greater than the second remaining running time, the ink supply pump continues to supply ink to the ink tank.

[0013] Furthermore, the ink supply device also includes an ink reservoir connected to the inlet end of the ink supply pump and a primary color ink reservoir connected to the ink reservoir, both of which are equipped with metering elements; the control method further includes S4; S4. Calculate the total ink requirement based on the remaining length of the printing equipment roll and the ink consumption of the printing plate; obtain the current ink level in the ink storage tank through the corresponding metering element; compare the total ink requirement with the current ink level. When the total ink demand exceeds the current ink inventory, calculate the required difference in ink quantity and control the primary ink container to add ink corresponding to the difference in ink quantity to the ink storage container. When the total ink demand is less than or equal to the current ink inventory, the control component stops controlling the primary color ink tank to add ink to the ink storage tank.

[0014] Compared with the prior art, the ink supply device and ink supply control method of this invention have the following advantages: A pre-scraping component is provided on the ink outlet side of the ink delivery roller in the rotation direction of the ink delivery roller. Utilizing the gap between the pre-scraping blade and the ink delivery roller, the ink layer adhering to the surface of the ink delivery roller can be pre-treated to reduce its thickness, thereby reducing the ink thickness on the surface of the engraving roller. This prevents ink from accumulating at both ends of the engraving roller due to excessive ink thickness, thus reducing ink waste and solvent evaporation. The pre-scraping blade is located above the ink trough with its tip facing the ink delivery roller, allowing the scraped excess ink to flow back into the ink trough below along the blade surface. This reduces the ink flow path length, decreases the system's ink circulation volume, and reduces the ink's exposure area in the air, thereby suppressing ink evaporation. This system improves ink recycling rates and reduces production costs. The gap adjustment unit regulates the gap between the pre-squeegee and the ink delivery roller, allowing for flexible adjustment of the ink quantity on the roller based on ink viscosity, printing speed, or different processes. This ensures the device maintains optimal ink delivery for diverse printing needs. A level detector monitors the ink level in the ink tank in real time and feeds the signal back to the control components to dynamically adjust the ink pump's displacement. This allows the ink supply rate to be matched to actual production consumption in real time, ensuring the ink tank level remains within a preset depth range. This effectively prevents ink overflow due to level fluctuations or printing quality problems caused by insufficient ink supply, guaranteeing production continuity and stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the ink supply device according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the ink tank and ink delivery roller of the ink supply device according to an embodiment of the present invention; Figure 3 This is a flowchart of S1 and S2 of the ink supply control method according to an embodiment of the present invention; Figure 4 This is a flowchart of S4 of the ink supply control method according to an embodiment of the present invention; In the picture, 1. Ink delivery roller; 2. Engraving roller; 3. Ink trough; 4. Pre-scraper assembly; 41. Pre-scraper blade; 42. Guide plate; 421. Guide surface; 43. Blade holder; 44. Gap adjustment part; 441. Adjusting handwheel; 442. Screw; 443. Moving nut; 5. Ink supply assembly; 51. Ink supply pump; 52. Liquid level detector; 6. Height adjustment assembly; 61. Support rack; 62. Adjusting gear; 63. Adjusting motor; 7. Ink reservoir; 8. Primary color ink reservoir; 9. Printing scraper. Detailed Implementation

[0016] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0017] In the description of this invention, the terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "lateral," and "longitudinal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0018] In the description of this invention, the terms "provided with," "set up," "connected," and "placed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0019] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0020] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0021] like Figure 1-4 As shown, an ink supply device according to the first embodiment of the present invention is applied to the engraving roller 2 of a printing equipment, comprising: frame; Ink delivery roller 1 is rotatably mounted on the frame, and the surface of ink delivery roller 1 abuts against the surface of engraving concave roller 2. Ink trough 3 is located below the ink delivery roller 1; The pre-scraping component 4 is located on the ink outlet side of the ink delivery roller 1 in the rotation direction. The pre-scraping component 4 includes a pre-scraping blade 41 and a gap adjustment part 44. The pre-scraping blade 41 is located above the ink trough 3, and the blade tip of the pre-scraping blade 41 faces the ink delivery roller 1 so that the scraped ink flows back into the ink trough 3. The gap between the pre-scraping blade 41 and the ink delivery roller 1 is adjusted by the gap adjustment part 44. The ink supply assembly 5 includes an ink supply pump 51 and a liquid level detector 52. The ink supply pump 51 is connected to the ink tank 3, and the liquid level detector 52 is installed on the ink tank 3 to detect the liquid level of the ink in the ink tank 3. The control component is electrically connected to the ink supply pump 51 and the level detector 52.

[0022] It should be noted that the surface of the ink roller 1 and the surface of the engraving roller 2 can be in contact with each other or the gap can be adjusted, depending on the construction requirements.

[0023] It should be noted that the ink supply device of the present invention can be applied to printing equipment, coating equipment and laminating equipment.

[0024] Based on the above technical solution, a pre-scraping component 4 is set on the ink outlet side of the ink delivery roller 1 in the rotation direction. Utilizing the gap between the pre-scraping blade 41 and the ink delivery roller 1, the ink layer adhering to the surface of the ink delivery roller 1 can be pre-treated to reduce its thickness, thereby reducing the ink thickness on the surface of the engraving roller 2. This prevents ink from accumulating at both ends of the engraving roller 2 due to excessive ink thickness, thus reducing ink waste and solvent evaporation. The pre-scraping blade 41 is located above the ink trough 3 with its tip facing the ink delivery roller 1, allowing the scraped excess ink to flow back into the ink trough 3 below along the blade surface. This reduces the amount of ink scraped by the printing doctor blade 9, thereby reducing the ink flow path length, decreasing the system's ink circulation volume, reducing the ink's exposure area in the air, suppressing ink evaporation, and improving efficiency. The high ink recycling rate reduces production costs. The gap between the pre-scraper blade 41 and the ink delivery roller 1 is adjusted by the gap adjustment unit 44, allowing for flexible adjustment of the amount of ink on the ink delivery roller 1 according to ink viscosity, printing speed, or different processes. This ensures that the device can maintain optimal ink delivery when facing diverse printing needs. The ink level detector 52 monitors the ink level in the ink tank 3 in real time and feeds the signal back to the control component to dynamically adjust the discharge rate of the ink supply pump 51. This allows the ink supply rate to be matched in real time according to actual production consumption, ensuring that the ink level in the ink tank 3 is always maintained within the preset depth range. This effectively prevents ink overflow hazards caused by liquid level fluctuations or printing quality problems caused by insufficient ink supply, ensuring the continuity and stability of production.

[0025] Preferably, the pre-scraping ink assembly 4 further includes a guide plate 42, which is disposed below the pre-scraping ink blade 41, and the guide surface 421 of the guide plate 42 is inclined to guide the ink groove 3.

[0026] The guide plate 42 is positioned below the pre-scraper blade 41, which can capture and collect the scraped ink in an instant. The guide surface 421 is inclined to guide the ink into the ink tank 3. Compared with vertical drop, it reduces the impact force generated when the ink hits the liquid surface in the ink tank 3, thereby suppressing secondary splashing, protecting the cleanliness of the equipment environment, and maintaining the stability of the ink liquid surface in the ink tank 3, which helps the liquid level detector 52 obtain accurate readings.

[0027] More preferably, the pre-scraping assembly 4 also includes a blade holder 43, a pre-scraping blade 41 is mounted on the blade holder 43, a guide plate 42 is disposed on the blade holder 43, the blade holder 43 is slidably disposed on the frame, and the power output end of the gap adjustment part 44 is connected to the blade holder 43 for driving the blade holder 43 to slide.

[0028] In one specific embodiment, the pre-scraping assembly 4 further includes a slide rail, which is fixedly mounted on the frame. The pre-scraping blade 41 and the guide plate 42 are mounted on the blade holder 43. The pre-scraping blade 41 is located above, with its blade tip close to or adjacent to the surface of the ink delivery roller 1. The guide plate 42 is located below the pre-scraping blade 41, with its guide surface 421 inclined at a preset angle toward the ink trough 3. The gap adjustment part 44 includes an adjustment handwheel 441 mounted on the frame, a screw 442 connected to the handwheel, and a movable nut 443 fixed on the blade holder 43. The operator drives the screw 442 to rotate by rotating the adjustment handwheel 441. Since the screw 442 and the movable nut 443 on the blade holder 43 form a threaded pair, the rotational motion of the screw 442 is converted into the linear motion of the blade holder 43 on the slide rail. The threaded drive has a self-locking function, which can ensure that the pre-scraping blade 41 remains stable in the selected position and will not shift due to vibration during the printing process.

[0029] More preferably, the ink supply device further includes a height adjustment component 6, which includes a support rack 61, an adjustment gear 62, and an adjustment motor 63. The support rack 61 extends vertically, and the top of the support rack 61 is connected to the bottom of the ink tank 3. The adjustment gear 62 meshes with the support rack 61, and the power output end of the adjustment motor 63 is connected to the adjustment gear 62 to drive the adjustment gear 62 to rotate.

[0030] A second embodiment of the present invention provides an ink supply control method applied to an ink supply device, comprising the following steps: S1. Obtain the real-time operating speed of the printing equipment and the ink consumption of the printing plate, and obtain the real-time ink level in the ink tank 3 through the liquid level detector 52; S2. The control component dynamically adjusts the discharge rate of the ink supply pump 51 according to the real-time operating speed, ink consumption of the printing plate and the real-time ink level, so as to maintain the depth of the ink delivery roller 1 immersed in the ink of the ink tank 3 within the preset depth range.

[0031] In one specific embodiment, in S1, the ink supply device obtains basic process parameters through the control component: ink consumption per meter of the printing plate I (mm³ / m), ink supply pump 51 displacement q (mm³ / n) per revolution, and distance from the center of the ink delivery roller 1 to the bottom of the ink tank 3. Vertical distance from level detector 52 to the bottom of ink tank 3 Including the diameter d of the ink delivery roller 1, the real-time running linear velocity V of the surface of the engraving concave roller 2, and simultaneously setting the stable running linear velocity of the surface of the engraving concave roller 2. During equipment operation, the liquid level detector 52 continuously monitors the distance between itself and the liquid surface of the ink tank 3. And feed the signal back to the control components.

[0032] Preferably, S2 includes step S21 of dynamically adjusting the displacement of the ink supply pump 51: S21. Calculate the current ink immersion depth of the ink delivery roller 1, compare the depth value with the preset first threshold and second threshold, and if the second threshold is greater than the first threshold, the first threshold and the second threshold define the normal ink immersion range; when the depth value is within the normal ink immersion range, calculate the target speed of the ink supply pump 51 and control the ink supply pump 51 to run at the target speed; when the depth value is greater than the second threshold, determine that there is excessive ink in the ink tank 3, calculate the target speed of the ink supply pump 51, and control the ink supply pump 51 to run at the target speed.

[0033] In one specific embodiment, the control component acquires a real-time feedback signal through the liquid level detector 52 and calculates the current ink immersion depth value of the ink delivery roller 1. , specifically, = - - +0.5d (mm) Based on this, the control component introduces a preset first threshold (7 mm in this embodiment) and a second threshold (10 mm in this embodiment). These two thresholds together define the normal ink immersion range of the ink roller 1, i.e., [7, 10] mm. Subsequently, the control component... Based on the given values, differentiated displacement control schemes will be adopted: when When the ink level is less than 7mm (first threshold), the ink trough 3 is determined to be in a low position or initial ink filling state, and the control component drives the ink supply pump 51 to fill according to the preset pre-fill coefficient. It operates at a speed of: = ×Ve×I / q (r / min) in, The value should be between 1.5 and 2.0 to allow the liquid level to rise rapidly to the working range.

[0034] When detected When the liquid level is in the range of [7,10] mm, the control component determines that the current liquid level is within the normal ink immersion range. At this time, the control component calls the first calculation model: N= ×V×I / q (r / min) The target rotational speed was calculated. Among them, The value is between 1.2 and 1.5. The target speed of the ink supply pump 51 is slightly greater than the theoretical ink consumption. The purpose is to meet the printing consumption while offsetting the ink circulation loss of the pre-scraping ink return and the ink supply device, thereby maintaining the ink level.

[0035] When detected When the ink level exceeds 10mm (the second threshold), the control component determines that there is excessive ink in ink tank 3, posing a risk of overflow or splashing. At this point, the control component automatically switches to the second calculation model. N= × ×I / q (r / min) The target rotational speed was calculated. Among them, A value between 0.5 and 0.7 indicates a stable operating linear velocity. .

[0036] By analyzing the displacement coefficient and The differentiated settings enable the ink supply system to have a self-regulating liquid level function. When the liquid level exceeds the preset range, it can be returned to its original level without manual intervention, ensuring a relatively constant ink volume in the ink tank 3 and solving the safety hazards caused by uncontrollable ink volume mentioned in the background technology.

[0037] More preferably, S2 also includes a follow-up control step S22 when the printing equipment is running at a non-uniform speed: S22, when the depth value is in the normal ink immersion range, the real-time operating speed of the printing equipment is obtained and compared with the preset stable operating speed to determine whether it is in a variable operating condition stage of preparing to accelerate or decelerate; if so, in order to avoid the ink supply quantity from lagging during the variable operating condition, the control component calculates the target ink supply speed required by the ink supply pump 51 according to the target rotation speed of the printing equipment after the variable operating condition and the preset transition time, thereby controlling the ink supply pump 51 to accelerate or decelerate smoothly.

[0038] In one specific embodiment, when the depth value h3 is within the normal ink immersion range (i.e. Under the premise of 7mm≤h3≤10mm, the control component obtains the real-time running linear speed V of the engraving concave roller 2.

[0039] If the real-time operating linear velocity V is detected to be equal to the stable operating linear velocity (i.e., V= The control component instructs the ink pump 51 to continuously output the target speed according to the aforementioned first calculation model, so as to maintain the dynamic balance of the liquid level in the ink tank 3 under stable printing conditions.

[0040] If the real-time operating linear speed V is detected to be inconsistent with the stable operating linear speed Ve, and the printing equipment is detected to be in a variable operating condition stage of preparing to increase or decrease speed, the control component enters the follow control step S22, and eliminates the response lag of the ink supply system by actively calculating the rate of change of rotational speed: For the speed-up operation, the control component calculates the corresponding speed of the ink supply pump 51 based on the target linear velocity to be achieved. (r / min), and obtain the preset acceleration time t (s) of the printing equipment, according to the formula: ω=( -N) / 60t (r / ) The required rotational speed acceleration of the ink supply pump 51 is calculated. Wherein, N is the real-time rotational speed of the ink supply pump 51 at the current moment, and the control component drives the ink supply pump 51 to accelerate uniformly at the rotational speed acceleration ω to increase the displacement of the ink supply pump 51.

[0041] For the speed reduction condition, the control component calculates the corresponding reduction speed of the ink supply pump 51 based on the target linear velocity to be achieved. (r / min), according to the formula: ω=(N- ) / 60t (r / ) The required rotational speed and acceleration of the ink supply pump 51 are calculated, and the control component drives the ink supply pump 51 to decelerate uniformly at the rotational speed and acceleration ω to reduce the displacement of the ink supply pump 51.

[0042] Following control step S22, by calculating the rotational acceleration of ink supply pump 51, compensation between the ink supply power source and the host load is achieved, ensuring that the speed adjustment of ink supply pump 51 is no longer a step-like sudden change, but a smooth transition according to the acceleration time t, so that the flow supply can cover the consumption gap in the variable operating condition stage in real time.

[0043] Preferably, the ink supply control method further includes S3; S3. Based on the remaining length of the printing roll and the real-time operating speed of the printing equipment, calculate the first remaining operating time required for the printing equipment to complete the current printing work order; calculate the second remaining operating time that the current amount of ink in the ink tank 3 can sustain. Compare the first remaining running time and the second remaining running time; when the first remaining running time is less than or equal to the second remaining running time, control the ink supply pump 51 to stop supplying ink, and control the regulating motor 63 to drive the support rack 61 to lift the ink tank 3 at a preset rising speed in order to maintain the ink immersion depth of the ink delivery roller 1. When the first remaining running time is greater than the second remaining running time, the ink supply pump 51 continues to supply ink to the ink tank 3.

[0044] In one specific embodiment, Obtaining the first remaining running time: The control component obtains pulse signals through an encoder installed on the unwinding motor shaft of the printing equipment. Combined with the real-time running linear speed V of the host machine, it determines the diameter of the roll on the current unwinding shaft, thereby calculating the remaining strip length. The control component will control the remaining strip length. Divide by the real-time running line speed V to obtain the first remaining running time required to complete the current printing work order. (i.e., the remaining startup time after the work order is completed), the calculation formula is: = / V (min) Second, the remaining running time is obtained as follows: First, the control component determines the total ink inventory in the current system using the following method. : Detect and calculate the ink height of ink trough 3 ( = - ); The corresponding height is obtained by looking up a table based on the geometric model of the ink groove 3 shape. Ink level in ink trough 3 (i.e., the net value after subtracting the volume occupied by the ink delivery roller 1 from the volume inside the ink trough 3). Combined with the ink inventory measured in the constant circulation path by the experiment To obtain the total stock = + .

[0045] Subsequently, the control component calculates the real-time consumption rate based on the real-time running line speed V and the ink consumption I on the printing plate, and then determines the second remaining running time. (That is, the operating time that the current stock of ink can sustain), the calculation formula is: = / (V×I) (min) Real-time comparison of control components and .like > If the current ink supply is insufficient to cover the remaining ink in the work order, the control component instructs ink pump 51 to maintain normal variable ink supply. ≤ (Preferably, a response coefficient should be introduced) The value is between 1.05 and 1.1, which satisfies the condition. = × When the current ink level is determined to be sufficient to cover the remaining ink in the work order, the control component performs the following actions: immediately stops the ink supply pump 51 from supplying ink to the ink tank 3; activates the height adjustment component 6, controls the adjustment motor 63 to drive the adjustment gear 62 to rotate, and drives the support rack 61 to move vertically upward slowly. To ensure a constant liquid level, the control component controls the rising speed S of the ink tank 3 to be synchronized with the ink consumption rate. S=( -0.5d-1)×(V×I) / (mm / min) By comparing the first remaining running time with the second remaining running time in real time, the system can determine the critical point of external ink supply. With the lifting of the height adjustment component 6, the residual ink that was originally at the bottom of the ink tank 3 and could not be sucked up can continue to adhere to the ink delivery roller 1, realizing the maximum utilization of the existing ink and reducing the amount of residual ink in the ink tank 3 after shutdown.

[0046] Preferably, the ink supply device further includes an ink reservoir 7 connected to the inlet end of the ink supply pump 51 and a primary color ink reservoir 8 connected to the ink reservoir 7. Both the ink reservoir 7 and the primary color ink reservoir 8 are equipped with metering elements; the control method further includes S4; S4. Calculate the total ink demand based on the remaining length of the printing equipment roll and the ink consumption of the printing plate; obtain the current ink level in the ink storage tank 7 through the corresponding metering element; compare the total ink demand with the current ink level. When the total ink demand exceeds the current ink inventory, calculate the required difference in ink quantity and control the primary ink tank 8 to add the corresponding difference in ink quantity to the ink storage tank 7. When the total ink demand is less than or equal to the current ink inventory, the control component stops controlling the primary ink tank 8 to add ink to the ink storage tank 7.

[0047] In one specific embodiment, the primary ink tank 8 adds ink to the ink storage tank 7 by manual pouring or by using an electronic valve structure to connect the primary ink tank 8 and the ink storage tank 7. The electronic valve is electrically connected to the control component.

[0048] The control component obtains the following parameters in advance: Maximum permissible ink level in ink reservoir 7 Minimum ink level allowed in ink reservoir 7 Ink level indicator for ink tank 7 triggering the ink refill action. The cross-sectional area of ​​ink reservoir 7 ; Total ink demand Acquisition: The control components continuously monitor the remaining length of the printing roll in the printing equipment. (Calculated in real time by the unwinding encoder), and combined with the preset ink consumption I, the total ink requirement for completing the remaining part of the current work order is calculated. The calculation formula is: = ×I (mm³) Ink tank capacity 7 Acquisition: The control component obtains the highest ink level in the ink reservoir 7. And combined with the cross-sectional area of ​​ink storage tank 7 Calculate the real-time ink content in the ink reservoir 7. : = × (mm³) Real-time comparison of control components and : when ≥ When it is determined that the ink in ink reservoir 7 is insufficient to meet printing requirements, the ink level in ink reservoir 7 drops to [a certain value]. At that time, the control component controls the primary color ink tank 8 to replenish ink to the ink storage tank 7 at the maximum amount, and the replenishment amount D is: D=( - )× (mm³) when At this point, the system determines that it has entered the work order completion stage, and the control component introduces a mixing coefficient. Calculate the ink replenishment amount using values ​​between 1.1 and 1.3: D= ×( ×I)+( - )× -C (mm³) Where C represents the real-time ink volume in ink tank 3 and the circulation pipeline.

[0049] Subsequently, the control component drives the ink pump or valve corresponding to the primary ink tank 8 to add the difference in ink quantity D into the ink storage tank 7 for mixing.

[0050] During the operation of the printing equipment, the control component reads the actual ink level H in the ink reservoir 7 in real time through the metering element and continuously compares it with the preset ink level height value. Perform a comparison. If H> is detected... The system determines that ink tank 7 has sufficient ink and maintains its current operating state while continuing real-time monitoring; if H≤ Upon determining that the ink level in ink reservoir 7 has dropped to the ink replenishment warning line, the system immediately triggers a subsequent ink replenishment assessment. When the ink replenishment assessment is triggered, the control component immediately calculates the remaining printing length for the current work order. A preset length threshold (500m in this embodiment) is introduced as the final ink addition cutoff criterion: If detected If the print run is less than 500m, the work order is considered to have entered the final stage. At this time, the existing ink in the system is sufficient to support the printing process until the printing is finished. The control components will no longer perform ink replenishment, but will maintain the printing equipment operation until the work order is completed and the shutdown ends. If detected If the print length is ≥500m, it is determined that more ink is needed. At this point, the control component will adjust the remaining print length. Assigned to the total length of subsequent printing (i.e., order) = Then, it jumps back to execute the aforementioned S4, thereby achieving the result based on the remaining printing length. The ink was added.

[0051] In traditional printing solutions, ink mixing often relies on manual experience for estimation. Due to concerns about machine downtime, ink is often mixed in excess, resulting in a large amount of unusable ink remaining in the ink tank 7 at the end of the work order. By matching the remaining printing volume with the actual inventory in the ink tank 7, adaptive ink replenishment can be performed in real time. This ensures that when printing stops, the residual ink in the ink tank 7 drops to the minimum level required to maintain safe system operation. This eliminates ink waste and reduces subsequent cleaning and recycling costs.

[0052] In summary, this invention provides an ink supply device and ink supply control method. A pre-scraping component 4 is provided on the ink outlet side of the ink delivery roller 1 in the rotation direction. Utilizing the gap between the pre-scraping blade 41 and the ink delivery roller 1, the ink layer adhering to the surface of the ink delivery roller 1 can be pre-treated to reduce its thickness, thereby reducing the ink thickness on the surface of the engraving roller 2. This prevents ink from accumulating at both ends of the engraving roller 2 due to excessive ink thickness, thus reducing ink waste and solvent evaporation. The pre-scraping blade 41 is located above the ink trough 3 with its tip facing the ink delivery roller 1, allowing the scraped excess ink to flow back into the ink trough 3 below, reducing the amount of ink scraped by the printing doctor blade 9. This reduces the ink flow path length, decreases the system's ink circulation volume, reduces the ink exposure area in the air, and inhibits... The evaporation of ink improves the ink recycling rate and reduces production costs. The gap adjustment unit 44 adjusts the gap between the pre-scraper 41 and the ink delivery roller 1, allowing for flexible adjustment of the amount of ink on the ink delivery roller 1 according to ink viscosity, printing speed, or different processes. This ensures that the device can maintain optimal ink delivery when facing diverse printing needs. The level detector 52 monitors the ink level in the ink tank 3 in real time and feeds the signal back to the control component to dynamically adjust the discharge rate of the ink supply pump 51. This allows the ink supply rate to be matched in real time according to actual production consumption, ensuring that the ink level in the ink tank 3 is always maintained within the preset depth range. This effectively prevents ink overflow hazards caused by level fluctuations or printing quality problems caused by insufficient ink supply, ensuring the continuity and stability of production.

[0053] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An ink supply device, applied to the engraving roller (2) of a printing equipment, characterized in that, include: frame; Ink delivery roller (1), the ink delivery roller (1) is rotatably mounted on the frame, and the surface of the ink delivery roller (1) abuts against the surface of the engraving concave roller (2); Ink trough (3), the ink trough (3) is disposed below the ink delivery roller (1); The pre-scraping component (4) is located on the ink outlet side of the ink delivery roller (1) in the rotation direction. The pre-scraping component (4) includes a pre-scraping blade (41) and a gap adjustment part (44). The pre-scraping blade (41) is located above the ink trough (3). The blade tip of the pre-scraping blade (41) faces the ink delivery roller (1) so that the scraped ink flows back into the ink trough (3). The gap between the pre-scraping blade (41) and the ink delivery roller (1) is adjusted by the gap adjustment part (44). The ink supply assembly (5) includes an ink supply pump (51) and a liquid level detector (52). The ink supply pump (51) is connected to the ink tank (3). The liquid level detector (52) is installed on the ink tank (3) and is used to detect the liquid level of the ink in the ink tank (3). The control component is electrically connected to the ink supply pump (51) and the level detector (52).

2. The ink supply device according to claim 1, characterized in that, The pre-scraping ink assembly (4) also includes a guide plate (42), which is disposed below the pre-scraping ink blade (41), and the guide surface (421) of the guide plate (42) is inclined to guide into the ink tank (3).

3. The ink supply device according to claim 2, characterized in that, The pre-scraping assembly (4) also includes a blade holder (43), the pre-scraping blade (41) is mounted on the blade holder (43), the guide plate (42) is disposed on the blade holder (43), the blade holder (43) is slidably disposed on the frame, and the power output end of the gap adjustment part (44) is connected to the blade holder (43) for driving the blade holder (43) to slide.

4. The ink supply device according to claim 3, characterized in that, It also includes a height adjustment component (6), which includes a support rack (61), an adjustment gear (62) and an adjustment motor (63). The support rack (61) extends vertically, and the top of the support rack (61) is connected to the bottom of the ink groove (3). The adjustment gear (62) meshes with the support rack (61). The power output end of the adjustment motor (63) is connected to the adjustment gear (62) to drive the adjustment gear (62) to rotate.

5. An ink supply control method, applied to the ink supply device as described in claim 4, characterized in that, Includes the following steps: S1. Obtain the real-time operating speed and ink consumption of the printing equipment, and obtain the real-time ink level in the ink tank (3) through the liquid level detector (52); S2. The control component dynamically adjusts the discharge rate of the ink supply pump (51) according to the real-time running speed, the ink consumption of the printing plate and the real-time ink level, so that the depth of the ink delivery roller (1) immersed in the ink of the ink tank (3) is maintained within a preset depth range.

6. The ink supply control method according to claim 5, characterized in that, S2 includes step S21, which involves dynamically adjusting the displacement of the ink supply pump (51): S21. Calculate the current ink immersion depth of the ink delivery roller (1), compare the depth value with a preset first threshold and a second threshold, the second threshold is greater than the first threshold, and the first threshold and the second threshold define the normal ink immersion range. When the depth value is within the normal ink immersion range, calculate the target rotation speed of the ink supply pump (51) and control the ink supply pump (51) to run at the target rotation speed; When the depth value is greater than the second threshold, it is determined that there is excessive ink in the ink tank (3), the target speed of the ink supply pump (51) is calculated, and the ink supply pump (51) is controlled to run at the target speed.

7. The ink supply control method according to claim 6, characterized in that, S2 also includes a follow-up control step S22 when the printing equipment is operating at a non-uniform speed: S22. When the depth value is within the normal ink immersion range, obtain the real-time operating speed of the printing equipment and compare it with the preset stable operating speed to determine whether it is in a variable operating condition stage that is preparing to accelerate or decelerate. If so, in order to avoid the ink supply lag during the change of operating conditions, the control component calculates the target ink supply speed required by the ink supply pump (51) based on the target rotation speed of the printing equipment after the change of operating conditions and the preset transition time, so as to control the ink supply pump (51) to accelerate or decelerate smoothly.

8. The ink supply control method according to claim 5, characterized in that, Also includes S3; S3. Calculate the first remaining running time required to complete the current printing work order based on the remaining length of the printing roll and the real-time operating speed of the printing equipment; Calculate the second remaining operating time that the current amount of ink in the ink tank (3) can sustain; Compare the first remaining runtime with the second remaining runtime; When the first remaining running time is less than or equal to the second remaining running time, the ink supply pump (51) is controlled to stop supplying ink, and the regulating motor (63) is controlled to drive the support rack (61) to lift the ink tank (3) at a preset rising speed to maintain the ink immersion depth of the ink delivery roller (1). When the first remaining running time is greater than the second remaining running time, the ink supply pump (51) continues to supply ink to the ink tank (3).

9. The ink supply control method according to claim 5, characterized in that, The ink supply device further includes an ink reservoir (7) connected to the inlet end of the ink supply pump (51) and a primary color ink reservoir (8) connected to the ink reservoir (7). Both the ink reservoir (7) and the primary color ink reservoir (8) are equipped with metering elements. The control method further includes S4. S4. Calculate the total ink requirement based on the remaining length of the printing equipment roll and the ink consumption of the printing plate. The current ink level in the ink storage tank (7) is obtained through the corresponding metering element; Compare the total ink demand with the current ink inventory; When the total ink demand exceeds the current ink inventory, the required difference in ink quantity is calculated, and the primary ink container (8) is controlled to add ink corresponding to the difference in ink quantity to the ink storage container (7). When the total ink demand is less than or equal to the current ink inventory, the control component stops controlling the primary color ink tank (8) to add ink to the ink storage tank (7).

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