Dynamic self-adjusting three-roll reverse coating device and quantitative adjustment method thereof

Abstract

A kind of dynamic self-regulating three-roll reverse coating device, it includes control unit, coating roller, tape roller, coating pressure roller, metering roller, liquid supply unit, metering roller scraping mechanism, tape roller, metering roller, coating pressure roller correspond to the gap between coating roller by tape roller adjusting mechanism, metering roller adjusting mechanism, coating pressure roller adjusting mechanism adjustment and coating roller;By metering roller adjusting mechanism real-time sensing the moving amplitude of sensing end, control unit according to moving amplitude, control the gap between metering roller and coating roller is adjusted to change no more than deviation threshold value.The coating device can realize the real-time dynamic automatic adjustment of coating device, so that the too wide or too narrow roller gap can be corrected in time, so that the coating liquid can be quantitatively transferred to the substrate surface layer.

Description

TECHNICAL FIELD

[0001] The present application relates to a coating device, in particular to a dynamic self-adjusting three-roller reverse coating device and a method for quantitative adjustment of coating liquid. BACKGROUND

[0002] In order to coat a substrate with a specific functional glue, paint, ink or other coating liquid with certain viscosity on the surface of the substrate, a coating device is usually used to control the amount of coating liquid added, and then the coating liquid is transferred to the surface of the substrate, and then dried and wound. How to achieve quantitative addition of coating liquid is the key to the reliability of the performance of the coating device. During the operation of the coating device, it may be affected by mechanical vibration, transmission stability, and equipment debugging difficulty, which may cause instability in the quantitative addition process of the coating liquid.

[0003] In order to overcome the above-mentioned adverse effects, ZL201410735323.5 provides a new three-roller coating structure, which uses a vertically arranged material roller, a metering roller and a coating pressure roller to form a coating liquid transmission structure. The gap between the material roller and the metering roller is changed by the second separation and pressing mechanism, and the gap between the metering roller and the coating pressure roller is changed by the first separation and pressing mechanism, so that the coating liquid can be quantitatively transferred to the surface of the substrate. The preferred solution uses a second precision screw pair to cooperate with a second inclined block to guide the lifting of a second moving frame, so as to realize the synchronous lifting of the metering roller and the coating pressure roller, thereby adjusting the distance between the metering roller and the material roller to realize the quantitative addition of the coating liquid on the metering roller. A first precision screw pair is used to cooperate with a first inclined block to guide the lifting of a first moving frame, so as to adjust the gap between the coating pressure roller and the metering roller. At the same time, since the gap between the material roller and the metering roller and the gap distance between the metering roller and the coating pressure roller are controlled in microns, under the influence of abnormal external vibration, vibration caused by power transmission of the power mechanism, and resistance formed by accumulated coating liquid between the two rollers, the gap between the rollers may be widened or narrowed to different degrees. In any case, the quantitative coating process on the surface of the substrate will be adversely affected. In the prior art, the first and second separation and pressing mechanisms are used to lift the roller groups and moving frames, but the adjustment process cannot be fine-tuned to microns due to the need for cooperation and control of the two sets of separation and pressing mechanisms and the large weight of the roller groups and moving frames driven by the two sets of separation and pressing mechanisms. Therefore, during long-term operation of the equipment, it is necessary to stop the machine and adjust the coating device to eliminate the above-mentioned adverse effects and avoid the production of defective products and unnecessary economic losses. SUMMARY

[0004] The application aims to provide a dynamic self-adjusting three-roller reverse coating device, which can realize real-time dynamic automatic adjustment of the coating device, so that the too wide or too narrow roller gap can be timely corrected, thereby enabling the coating liquid to be quantitatively transferred to the substrate surface.

[0005] To achieve the above technical purpose, the application adopts the following technical solutions:

[0006] A dynamic self-adjusting three-roller reverse coating device comprises a control unit, a coating roller, a material belt roller, a coating pressure roller, a metering roller, a liquid supply unit and a metering roller scraping mechanism. The material belt roller, the metering roller and the coating pressure roller correspond to a material belt roller adjusting mechanism, a metering roller adjusting mechanism and a coating pressure roller adjusting mechanism to adjust the gap between the coating roller. The coating roller shaft is connected to the main frame. The coating roller, the material belt roller, the coating pressure roller and the metering roller are driven by independent roller driving mechanisms. The material belt roller, the metering roller and the coating pressure roller are sequentially arranged along the position of the rotation direction of the coating roller. The metering roller adjusting mechanism comprises a pair of first horizontal guide rails arranged on the main frame, a fine adjustment frame, a first servo motor, a first precision screw pair, an electronic ruler arranged on the fine adjustment frame and the main frame, and a sensing end. The electronic ruler senses the movement amplitude of the sensing end in real time. The control unit controls the first servo motor to drive the first precision screw pair to drive the fine adjustment frame to slide along the first horizontal guide rail according to the movement amplitude, so that the gap between the metering roller and the coating roller is adjusted to change by not more than a deviation threshold.

[0007] Further, the contact position of the scraper part and the metering roller is suspended on the upper end of the coating liquid tank of the liquid supply unit.

[0008] Further, the metering roller scraping mechanism comprises a swing shaft seat arranged on the upper end of the fine adjustment frame, and the swing shaft of the scraper part is connected to the swing shaft seat. The angle fine adjustment mechanism adjusts and locks the swing amplitude of the swing shaft, so that the gap between the scraper part and the metering roller is maintained.

[0009] Further, the material belt roller adjusting mechanism comprises a material belt roller shaft seat and a lifting adjusting mechanism. The material belt roller shaft is connected to the material belt roller shaft seat. The lifting adjusting mechanism adjusts and locks the height of the material belt roller shaft seat, so that the gap between the material belt roller and the coating roller is maintained.

[0010] Further, the material belt roller adjusting mechanism comprises a material belt roller shaft seat and a lifting adjusting mechanism. The material belt roller shaft is connected to the material belt roller shaft seat. The lifting adjusting mechanism adjusts and locks the height of the material belt roller shaft seat, so that the gap between the material belt roller and the coating roller is maintained.

[0011] Further, the coating pressure roller adjusting mechanism is a coating pressure roller shaft base and a translation adjusting mechanism, the coating pressure roller shaft is connected to the coating pressure roller shaft base, the translation adjusting mechanism adjusts and locks the translation amplitude of the coating pressure roller shaft base, so that the coating pressure roller and the coating roller maintain a fixed gap.

[0012] Further, the coating roller, the material belt roller, the coating pressure roller and the metering roller are driven to rotate by independent roller driving motors through universal shaft couplings.

[0013] Further, the liquid supply unit comprises a coating liquid tank driven to ascend and descend by an ascending and descending mechanism, and the ascending and descending mechanism drives the coating liquid tank to ascend and descend to the inner cavity of the material belt roller.

[0014] Another object of the present application is to provide a coating liquid quantitative adjusting method of the above-mentioned dynamic self-adjusting three-roller reverse coating device, which is realized by the following steps:

[0015] Step (1): the control unit controls the first precision screw pair driven by the first servo motor to move the fine adjustment rack to a predetermined position, and the control system records the preset distance between the electronic ruler and the sensing end;

[0016] Step (2): the control unit is preset with a first offset threshold, and the minimum precision unit of the first offset threshold is 1 micrometer;

[0017] Step (3): when the metering roller rotates reversely relative to the coating roller to remove the coating liquid on the surface of the coating roller, the control system records the working distance between the electronic ruler and the corresponding sensing end in real time, and when the difference between the working distance of any one side and the preset distance is greater than the first offset threshold, the control unit controls the first servo motor of the one side to drive the first precision screw pair of the one side to move the fine adjustment rack of the one side to the predetermined position.

[0018] Further, the above-mentioned method further comprises the following steps:

[0019] In the step (2), the control unit is preset with a second offset threshold greater than the first offset threshold, and the minimum precision unit of the second offset threshold is 1 micrometer;

[0020] In the step (3), when the difference between the working distance of one side and the working distance of the other side is greater than the second offset threshold, the control unit simultaneously controls the first servo motors of the two sides to rotate reversely, so that the two first servo motors drive the two first precision screw pairs to move the two fine adjustment racks towards each other.

[0021] The present application has at least the following advantages:

[0022] By adopting a coating roller as a reference roller, taking its position as a reference, adjusting the strip roller and the coating pressure roller through the strip roller adjusting mechanism and the coating pressure roller adjusting mechanism, and adjusting the gap between the metering roller and the conversion roller in micron level in real time through the metering roller adjusting mechanism, the controllability and sensitivity of the equipment can be effectively improved, the adjustment is timely and accurate, the excessive deviation of the gap between the metering roller and the coating roller is prevented, and the influence of abnormal external vibration, vibration caused by power transmission of the power mechanism, resistance formed between the surfaces of the two rollers by accumulated coating liquid and other adverse factors on the coating liquid metering process is effectively eliminated.

[0023] Compared with the prior art that adopts a first and a second separation and pressing mechanism to vertically lift the coating pressure roller, the metering roller and the auxiliary components, the application adopts a first horizontal guide rail, a fine adjustment rack, a first servo motor and a first precision screw pair as a mechanism for driving the metering roller to finely adjust and translate, avoids the influence of vertically lifting the heavy roller group and the auxiliary components on the precision screw pair components, makes the micron-level fine dynamic self-adjustment process more stable, cooperates with a reasonable metering roller scraping mechanism, is installed to the metering roller adjusting mechanism and forms a follow-up structure, and can also reduce the vibration source of the additional power mechanism, avoids the interference with the coating liquid metering accuracy caused by the driving of the metering roller scraping mechanism relative to the metering roller scraping. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is a schematic view of the application;

[0025] Fig. 2 is a perspective view of the application from the side. EMBODIMENT

[0026] It should be understood that the specific embodiments described herein are merely intended to explain the application and are not intended to limit the application. The application is described in detail below by embodiments in conjunction with the drawings: EMBODIMENT

[0027] As Figs. 1-2 shown, a dynamic self-adjusting three-roller reverse coating device includes a control unit, a coating roller 10, a strip roller 11, a metering roller 12, a coating pressure roller 13, a liquid supply unit, a metering roller scraping mechanism and a main rack 2. The coating roller 10 is connected to the main rack 2 and is driven by a coating roller drive motor. The strip roller 11, the metering roller 12 and the coating pressure roller 13 are arranged in sequence along the position of the coating roller 10 in the direction of rotation of the coating roller 10. The strip roller 11 is driven by a strip roller drive motor and the gap between the strip roller 11 and the coating roller 10 is adjusted by a strip roller adjusting mechanism. The metering roller 12 is driven by a metering roller drive motor and the gap between the metering roller 12 and the coating roller 10 is adjusted by a metering roller adjusting mechanism. The coating pressure roller 13 is driven by a coating pressure roller drive motor and the gap between the coating pressure roller 13 and the coating roller 10 is adjusted by a coating pressure roller adjusting mechanism.

[0028] Specifically, the belt roller adjusting mechanism is arranged on the main frame 2 and below the coating roller 10, and the liquid supply unit is below the belt roller 11. Specifically, it is composed of a belt roller shaft seat 111 and a lifting adjusting mechanism. The belt roller 11 is connected to the belt roller shaft seat 111, and the lifting adjusting mechanism adjusts and locks the height of the belt roller shaft seat 111 to maintain the gap between the belt roller 11 and the coating roller 10. The liquid supply unit includes a lifting mechanism 32 driving the lifting coating liquid tank 31. When the lifting mechanism 32 drives the coating liquid tank 31 to lift into the inner cavity of the belt roller 11, the feeding system pumps the coating liquid to the coating liquid tank 31, and the belt roller 11 can obtain the coating liquid from the coating liquid tank 31. After the belt roller driving motor drives the belt roller 11 to rotate relative to the coating roller 10, the belt roller 11 reversely transfers the coating liquid to the coating roller 10. At this time, the first interval range between the belt roller 11 and the metering roller 12 on the surface of the coating roller 10 can be uniformly coated with a small amount of excess coating liquid.

[0029] During the above working process, the coating liquid in the first interval range is added in a slightly excessive manner. By controlling the stable gap between the belt roller 11 and the coating roller 10, the coating liquid content in the first interval range is within the coarse adjustment range, and it is ensured that the coating liquid does not accumulate excessively in the gap range between the metering roller 12 and the coating roller 10. The roller gap between the belt roller 11 and the coating roller 10 does not need to be adjusted frequently and accurately. At the same time, in order to improve the convenience of the adjustment process, in this embodiment, the lifting adjusting mechanism is composed of lifting guide rails 112 arranged on both sides of the main frame 2, lifting screw pairs 113 driving the belt roller shaft seat 111 to lift along the lifting guide rails 112, and adjustment knobs 114 adjusting the rotation of the lifting screws to lift the belt roller shaft seat 111. Through this structure, the operator can conveniently adjust and lock the coarse positioning of the belt roller shaft seat 111, and maintain a reasonable gap range between the belt roller 11 and the coating roller 10.

[0030] In order to realize the accurate control of the coating liquid in the second interval range between the metering roller 12 and the coating pressure roller 13 on the surface of the coating roller 10, it is necessary to adjust and maintain the gap between the metering roller 12 and the coating roller 10, and the allowable deviation threshold of the gap range needs to be controlled between several microns. Due to the abnormal external vibration that may occur in the production site, the vibration caused by the power transmission of the power mechanism, and the resistance formed by the accumulated coating liquid between the two rollers, it is inevitable to affect the roller gap between the metering roller 12 and the coating roller 10. Compared with the technical solution of regular shutdown debugging in the prior art, the present application can realize accurate metering control of the coating amount through accurate real-time adjustment of the metering roller 12 by the metering roller adjusting mechanism.

[0031] Specifically, the metering roller adjusting mechanism is a pair of first horizontal guide rails 121 arranged on the main frame 2, a fine adjustment frame 122, a first servo motor 123, a first precision screw pair 124, an electronic ruler 125 and a sensing end 126 arranged on the fine adjustment frame 122 and the main frame 2; the electronic ruler 125 senses the movement amplitude of the sensing end 126 in real time, and a control unit controls the first servo motor 123 to drive the first precision screw pair 124 to drive the fine adjustment frame 122 to slide along the first horizontal guide rail, so that the gap between the metering roller 12 and the coating roller 10 is adjusted to change by not more than a deviation threshold.

[0032] The first horizontal guide rail 121, the fine adjustment frame 122, the first servo motor 123 and the first precision screw pair 124 are used as the structure for driving the fine adjustment of the metering roller 12, during the pre-adjustment process of the equipment, the control unit controls the first servo motor 123 to drive the first precision screw pair 124 to move the fine adjustment frame 122 to a predetermined position, the control system records the preset distance between the electronic ruler 125 and the sensing end 126, and the control unit is preset with a first offset threshold, and the minimum precision unit of the first offset threshold is 1 micrometer; when the equipment performs the coating process, the coating roller 10 coated with coating liquid in the first interval range is rotated to the minimum gap between the metering roller 12, and too much coating liquid will be scraped off by the metering roller 12 rotating in the opposite direction relative to the coating roller 10, so that the coating liquid is quantitatively transferred to the second interval range on the roller surface of the coating roller 10; in order to eliminate the influence of abnormal external vibration, vibration caused by power transmission of the power mechanism, and resistance formed by accumulated coating liquid between the two roller surfaces, the control system records the working distance between the two electronic rulers 125 and the corresponding sensing ends 126 in real time, and when the difference between the working distance of any one side and the preset distance is greater than the first offset threshold, the control unit controls the first servo motor 123 of the one side to drive the first precision screw pair 124 of the same side, so that the fine adjustment frame 122 of the same side moves to a predetermined position, so that the gap between the metering roller 12 and the coating roller 10 is within an acceptable range, thereby realizing the quantitative coating of the coating liquid on the second interval range on the roller surface of the coating roller 10 by the metering roller 12.

[0033] Compared with the prior art, the first precision screw pair 124 directly adjusts the movement of the fine adjustment frame 122 and the metering roller 12, which has the advantages of accurate and direct stroke; and since the components driven by the first servo motor 123 and the first precision screw pair 124 are relatively light, the sensing end 126 mounted on the fine adjustment frame 122 and the electronic ruler 125 mounted on the main frame 2 can realize real-time precision adjustment in microns, and the adverse effects of the first and second moving frames, the coating pressure roller and the metering roller 12 on the stability of the precision screw are avoided.

[0034] The translation adjustment mechanism adjusts and locks the translation amplitude of the coating pressure roller shaft base 132, so that the gap between the coating pressure roller 13 and the coating roller 10 connected to the coating pressure roller shaft base 132 is maintained stable, and the substrate is pressed between the coating pressure roller 13 and the coating roller 10, so that during the synchronous reverse rotation of the coating roller 10 and the coating pressure roller 13, the coating liquid in the second interval range of the coating roller 10 is transferred to the surface layer of the substrate between the coating pressure roller 13 and the coating roller 10. Since the coating pressure roller 13 is a roller with an elastic rubber layer on the surface, preferably, a pair of translation guide rails 131 arranged on the main frame 2 and a pair of translation cylinders 133 driving the coating pressure roller shaft base 132 to move along the translation guide rails 131 are used as the translation adjustment mechanism. After setting the pressure parameter, the coating pressure roller shaft base 132 is pressed by the translation cylinder 133, so that the coating pressure roller 13 and the coating roller 10 can tightly press the substrate, the running linear speed of the coating pressure roller 13 and the coating roller 10 is consistent with the running linear speed of the substrate, and the second interval range of the coating liquid has been quantified, so that the equipment basically does not need to be adjusted during normal operation.

[0035] In actual production, due to different production processes, such as different flowability of the coating liquid used, different tensile strength of the substrate and other influencing factors, it is necessary to control the rotation speed of each roller group to run reasonably. The four rollers of the strip roller 11, the coating roller 10, the metering roller 12 and the coating pressure roller 13 are driven by independent servo motors, and the rotation speed of each roller can be adjusted according to different process requirements; preferably, the coating roller 10, the strip roller 11, the coating pressure roller 13 and the metering roller 12 are driven to rotate by independent servo motors respectively through universal couplings 100. Since the universal coupling is provided, the angular compensation ability is provided under the condition that the output shaft of the servo motor and the roller shaft are not on the same axis, so that the servo motor can still reliably transmit torque to the roller shaft.

[0036] For some coating liquid that is easy to cause excessive accumulation in the gap range between the metering roller 12 and the coating roller 10, in order to avoid excessive accumulation of the coating liquid causing the resistance between the metering roller 12 and the coating roller 10 to increase and excessively affect the gap between the metering roller 12 and the coating roller 10, the metering roller scraping mechanism is used to scrape the coating liquid on the surface of the metering roller 12, so as to effectively reduce the excessive coating liquid attached to the metering roller 12 when it rotates again towards the coating roller 10; based on the lightweight metering roller adjusting mechanism, the pair of swing shaft shaft seats 44 arranged on the upper end of the fine adjustment rack 122, the angle fine adjustment mechanism 42, and the scraper part 41 of the swing shaft 43 shaft connected to the swing shaft shaft seat 44 can be used as the metering roller scraping mechanism. By adjusting and locking the swing amplitude of the swing shaft 43 through the angle fine adjustment mechanism 42, the gap between the scraper part 41 and the metering roller 12 is maintained, so that when the metering roller 12 rotates away from the coating roller 10, the excessive coating liquid on the surface of the metering roller 12 can be scraped off; as the scraper part 41 is used as the scheme for scraping the excessive coating liquid on the metering roller 12, the linear blade part of the scraper part 41 can adjust the included angle and gap between the linear blade part and the tangent of the roller surface through the angle fine adjustment mechanism 42, and can be reasonably adjusted according to different types of coating liquid. Compared with other types of metering roller scraping mechanisms, the linear blade part of the scraper part 41 effectively reduces the viscous effect of the coating liquid on the blade part, so as to reduce the resistance effect between the metering roller 12 and the scraper part 41 during operation. In combination with the sensing of the sensing end 126 by the electronic ruler 125 of the metering roller adjusting mechanism and the adjustment of the fine adjustment rack 122 by the first servo motor 123 and the first precision screw pair 124, the influence of the resistance effect on the change of the gap between the metering roller 12 and the coating roller 10 can be controlled.

[0037] Preferably, the contact position of the scraper part 41 and the metering roller 12 is suspended above the upper end of the coating liquid tank 31 of the liquid supply unit. Through this arrangement, after the scraper part 41 scrapes the excessive coating liquid on the metering roller 12, it can flow back into the coating liquid tank 31, thereby avoiding the influence of the coating liquid on the working environment of the equipment and improving the recycling rate of the coating liquid.

[0038] When the equipment is subjected to a large amplitude of abnormal external vibration, the distance difference between the working distance on one side and the working distance on the other side may be large. Since the shaft part and the metering roller 12 shaft connect the two fine adjustment racks 122, directly readjusting the fine adjustment rack 122 on the side with larger working distance deviation may cause wear of the first precision screw pair 124, and repeated readjustment may affect the accuracy of the first precision screw pair 124 on that side. To avoid the above situation, a second offset threshold greater than the first offset threshold is preset for the control unit, and the minimum accuracy unit of the second offset threshold is 1 micrometer.

[0039] When the distance difference between the working distance of one side and the working distance of the other side is greater than the second offset threshold, the control unit simultaneously controls the first servo motors 123 on both sides to rotate in opposite directions, so that the first servo motors 123 drive the first precision screw rod pairs 124 to move the fine adjustment racks 122 towards each other. Through this scheme, the accuracy of the first precision screw rod pairs 124 can be effectively ensured, and the service life of the equipment is prolonged.

[0040] The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A dynamic self-adjusting three-roll reverse coating device, comprising a control unit, a coating roller, a feed roller, a coating pressure roller, a metering roller, a liquid supply unit, and a metering roller scraping mechanism; characterized in that: The material conveyor roller, metering roller, and coating pressure roller are adjusted in relation to the coating roller via corresponding material conveyor roller adjustment mechanisms, metering roller adjustment mechanisms, and coating pressure roller adjustment mechanisms. The coating roller is axially connected to the main frame. Each of the coating roller, material conveyor roller, coating pressure roller, and metering roller is driven by its own independent roller drive mechanism, and the material conveyor roller, metering roller, and coating pressure roller are arranged sequentially along the rotation direction of the coating roller. The metering roller adjustment mechanism consists of a first horizontal guide rail, a fine-tuning frame, a first servo motor, and a first precision lead screw pair, all mounted in pairs on the main frame, and mounted on the fine-tuning frame. The main frame includes an electronic ruler and a sensing end; the metering roller scraping mechanism consists of a pair of swing shaft seats mounted on the upper end of the fine-tuning frame, with the swing shaft of the scraper part connected to the swing shaft seat. The angle fine-tuning mechanism adjusts and locks the rotation amplitude of the swing shaft to maintain a gap between the scraper part and the metering roller; the electronic ruler senses the movement amplitude of the sensing end in real time, and the control unit controls the first servo motor to drive the first precision lead screw pair to move the fine-tuning frame along the first horizontal slide rail based on the movement amplitude, adjusting the gap change between the metering roller and the coating roller to not exceed the deviation threshold.

2. The dynamic self-adjusting three-roll reverse coating device as described in claim 1, characterized in that: The contact point between the scraper and the metering roller is suspended above the coating liquid tank of the liquid supply unit.

3. The dynamic self-adjusting three-roll reverse coating device as described in claim 1, characterized in that: The material roller adjustment mechanism consists of a material roller bearing and a lifting adjustment mechanism. The material roller is connected to the material roller bearing. The lifting adjustment mechanism adjusts and locks the height of the material roller bearing to maintain a gap between the material roller and the coating roller.

4. The dynamic self-adjusting three-roll reverse coating device as described in claim 3, characterized in that: The lifting and adjusting mechanism consists of lifting guide rails on both sides of the main frame, a lifting screw pair that drives the material roller bearing to rise and fall along the lifting guide rails, and an adjusting handwheel that adjusts the rotation of the lifting screw to raise and lower the material roller bearing.

5. The dynamic self-adjusting three-roll reverse coating device as described in claim 1, characterized in that: The coating roller adjustment mechanism is a coating roller bearing seat and a translation adjustment mechanism. The coating roller bearing is connected to the coating roller bearing seat. The translation adjustment mechanism adjusts and locks the translation range of the coating roller bearing seat to maintain a fixed gap between the coating roller and the coating roller.

6. The dynamic self-adjusting three-roll reverse coating apparatus as described in any one of claims 1-5, characterized in that: The coating roller, conveyor roller, coating pressure roller, and metering roller are each driven to rotate by their own independent roller drive motors via universal couplings.

7. The dynamic self-adjusting three-roll reverse coating apparatus as described in any one of claims 1-5, characterized in that: The liquid supply unit includes a coating liquid tank that is lifted and lowered by a lifting mechanism. The lifting mechanism drives the coating liquid tank to rise and fall until the material roller enters the inner cavity of the coating liquid tank.

8. A method for quantitative adjustment of coating liquid in a dynamic self-adjusting three-roll reverse coating device as described in claims 1-7, characterized by the following steps: Step (1): The control unit controls the first servo motor to drive the first precision lead screw pair, so that the fine-tuning frame moves to the predetermined position, and the control system records the preset distance between the electronic ruler and the sensing end; Step (2): Preset a first offset threshold for the control unit, wherein the minimum precision unit of the first offset threshold is 1 micrometer; Step (3): When the metering roller rotates in the opposite direction to the coating roller and scrapes off the coating liquid on the surface of the coating roller, the control system records the working distance between the electronic rulers on both sides and the corresponding sensing ends in real time. When the difference between the working distance on either side and the preset distance is greater than the first offset threshold, the control unit controls the first servo motor on that side to drive the first precision lead screw pair on the same side, so that the fine-tuning frame on the same side moves to the predetermined position.

9. The quantitative adjustment method as described in claim 8, characterized by the following steps: In step (2), a second offset threshold greater than the first offset threshold is preset for the control unit, and the minimum precision unit of the second offset threshold is 1 micrometer. In step (3), when the difference between the working distance on one side and the working distance on the other side is greater than the second offset threshold, the control unit simultaneously controls the first servo motors on both sides to rotate in opposite directions, so that the two first servo motors drive the two first precision lead screw pairs, and the two fine-tuning frames move towards each other.

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