A multiple drying coater

Abstract

The present invention relates to the technical field of coating machines, and discloses a multi-drying coating machine, which includes a support plate body, a base material roller, a composite dryer, and a discharge roller. The two ends of the support plate body are respectively rotatably connected with a base material roller and a discharge roller. A composite dryer is arranged between the base material roller and the discharge roller. A tension shaft is arranged between the base material roller and the composite dryer. A coating mechanism is arranged on one side of the tension shaft. The coating mechanism includes a transfer coating roller, a support base, and a comma knife. A coating base material is arranged between the transfer coating roller and the support base. The comma knife is arranged on one side of the transfer coating roller, and ultrasonic vibration modules are arranged on both the upper and lower sides of the comma knife. The ultrasonic vibration modules change the electromagnetic field around the comma knife to generate high-frequency vibration on the surface of the comma knife; the high-frequency vibration of the comma knife not only optimizes the distribution of the coating material, but also enhances the interaction between the coating material and the base material, effectively promoting the contact and penetration between the coating material molecules and the coated base material.

Description

Technical Field

[0001] The present invention relates to the technical field of coating machines, and specifically to a multi-drying coating machine. Background Art

[0002] A coating machine is an important painting equipment, mainly used for the surface coating process production of substrates such as thin films, papers, wooden boards, glasses, leathers, aluminum materials, plastic films, etc. It coats a roll of substrate with a specific functional glue, coating, ink, etc., and then winds it up or cuts it into pieces after drying. The coating machine adopts a special multi-functional coating head, which can realize various forms of surface coating. Its unwind and rewind are both equipped with full-speed automatic film splicing mechanisms, and the tension closed-loop automatic control is realized through the PLC program. According to different coating methods and application scenarios, there are various types of coating machines, such as brush coating machines, air knife coating machines, blade coating machines, roll coating machines, spray coating machines, curtain coating machines, and slot coating machines, etc. These different types of coating machines have their own characteristics in terms of coating process, coating effect, application scope, etc., and can meet the needs of different industries and customers.

[0003] However, the existing multi-drying coating machines are usually used in occasions with high requirements for coating quality, such as the field of perovskite batteries. These fields have strict requirements for the uniformity, adhesion, and protection performance of the coating. The two major problems often encountered in the coating process of this multi-drying coating machine are uneven coating and the presence of bubbles in the coating. Uneven coating often occurs when using coatings with unstable viscosity and large particle size, or when the coating roller is worn, the pressure is uneven, the speed is inappropriate, the surface of the roller is uneven, or the motor speed is uneven. This will result in inconsistent coating thickness, affecting the appearance and performance of the product. And the presence of bubbles in the coating will affect the adhesion and protection performance of the coating, thereby shortening the service life of the product. And if the coating quality is improved by simply vibrating the coating roller or the blade through a vibration structure.

[0004] For example, a leveling mechanism of a coating machine proposed in Chinese Patent CN201521084858.7 includes a base, a tool holder, a leveling blade, and an ultrasonic generator. The above tool holder is fixedly installed on the base, the above leveling blade is fixedly installed on the tool holder, and the above ultrasonic generator is fixedly installed on the base and the tool holder. However, in this structure, since the ultrasonic generator drives the leveling blade to vibrate indirectly through structures such as the base and the tool holder, the energy loss is very large, and it will also cause serious noise. And the vibration frequency and direction of the ultrasonic generator may be limited by the design of the overall structure, and the control accuracy is relatively low. At the same time, this ultrasonic generator structure is extremely prone to failure. Summary of the Invention

[0005] (1) Technical problems to be solved: Aiming at the deficiencies of the prior art, the present invention provides a multi-drying coater, which has the advantages of uniform coating thickness, strong adhesion, effective removal of air bubbles in the coating, low maintenance cost, and low failure rate, and solves the problems of uneven coating, unstable coating viscosity, air bubbles in the coating, high usage cost, and high failure rate.

[0006] (2) Technical solutions: To achieve the above objectives of uniform coating thickness, strong adhesion, and effective removal of air bubbles in the coating with low maintenance cost, the present invention provides the following technical solutions: A multi-drying coater includes a support plate body, a base material roller, a composite dryer, and a discharge roller. The two ends of the support plate body are respectively rotatably connected to a base material roller wound with an initial unprocessed coating base material and a discharge roller wound with the processed base material. A composite dryer is arranged between the base material roller and the discharge roller, and the composite dryer is fixedly installed on the support plate body. The coating base material on the base material roller passes through the composite dryer and is wound on the discharge roller. An inlet tension shaft and an outlet tension shaft are arranged between the base material roller and the composite dryer. A coating mechanism is arranged between the inlet tension shaft and the outlet tension shaft. The coating mechanism includes a transfer roller, a support base, and a comma knife. The coating base material is arranged between the transfer roller and the support base. The comma knife is arranged on one side of the transfer roller. The surface of the transfer roller is provided with a coating material. The tip of the comma knife is attached above the coating base material, and ultrasonic vibration modules are arranged on both the upper and lower sides of the comma knife. The comma knife is internally provided with a magnetic core. The ultrasonic vibration modules change the electromagnetic field around the comma knife to generate high-frequency vibration on the surface of the comma knife, thereby evenly covering the coating material on the coating base material.

[0007] Preferably, the ultrasonic vibration modules include a base magnet and an adsorption magnet. The base magnet is slidably arranged below the support base, and both ends of the base magnet are slidably connected to the support plate body. A cylindrical coating cavity and an annular discharge cavity are arranged inside the transfer roller. The discharge cavity is arranged between the transfer roller and the coating cavity. The adsorption magnet is arranged in the discharge cavity. The adsorption magnet is rotatably connected to both ends of the coating cavity. The magnetic fields generated by the adsorption magnet and the base magnet act on the comma knife together. Both the adsorption magnet and the base magnet are electromagnets. When they generate an electromagnetic field, the comma knife generates vibration.

[0008] Preferably, when the adsorption magnet and the base magnet generate an electromagnetic field, the comma knife is heated to make it heat up; and by controlling the electromagnetic field intensity and angle generated by the adsorption magnet and the base magnet on the comma knife, the distance and angle between the tip of the comma knife and the coating base material are adjusted.

[0009] Preferably, the transfer roller is rotatably connected to the discharge chamber, and a discharge hole is provided at the bottom of the discharge chamber. The discharge hole communicates with the surface of the transfer roller, and a communication hole communicating with the discharge chamber is provided at the top of the coating chamber.

[0010] Preferably, sliding tool holders are rotatably connected to both ends of the comma doctor blade. The sliding tool holders are slidably assembled on the support plate body, and an elastic buffer structure is provided between the comma doctor blade and the sliding tool holders.

[0011] Preferably, the coating chamber structure is made of ferromagnetic metal, and the adsorption magnet heats the coating chamber when generating an electromagnetic field.

[0012] Preferably, both ends of the transfer roller are rotatably connected to the support plate body, and the transfer roller can slide vertically relative to the support plate body.

[0013] Preferably, both the adsorption magnet and the base magnet can be rotated to adjust the angle of the electromagnetic field on the comma doctor blade. Two groups of comma doctor blades are symmetrically arranged on both sides of the transfer roller, two groups of base magnets are symmetrically arranged on both sides of the transfer roller, and two groups of adsorption magnets are symmetrically arranged in the discharge chamber; the electromagnetic fields generated by the adsorption magnets on both sides and the base magnets have equal periods and opposite magnitudes of current and voltage changes, so that the vibration frequencies of the comma doctor blades on both sides are equal and the vibration directions are opposite.

[0014] Preferably, the transfer roller is rotatably connected to the support plate body, and the support base is fixedly installed on the support plate body.

[0015] Preferably, the coating chamber is connected to a container containing the coating.

[0016] (III) Beneficial effects: Compared with the prior art, the present invention provides a multiple drying coater, which has the following beneficial effects: 1. In this multiple drying coater, through the combined use of the comma doctor blade structure, the base magnet structure, and the adsorption magnet structure, the high-frequency vibration of the comma doctor blade not only optimizes the distribution of the coating but also enhances the interaction between the coating and the substrate. The vibration effectively promotes the contact and penetration between the coating molecules and the coated substrate. This intermolecular interaction enhances the bonding force between the coating and the substrate, making the coating adhere more firmly to the substrate. It not only improves the uniformity of the coating but also enhances the adhesion of the coating, thereby improving the overall coating effect of the coater. In addition, by adjusting the magnitude, direction, and frequency of the current of the base magnet and the adsorption magnet, the vibration amplitude and frequency of the comma doctor blade can be precisely controlled to adapt to different coating requirements and substrate characteristics.

[0017] 2. The multi-drying coater, through the combined use of a comma knife structure, a base magnet structure, and an adsorption magnet structure, uses electromagnetic induction heating to increase the temperature of the comma knife. Utilizing the thermal expansion effect and the change in the viscosity of the coating material, when the comma knife scrapes off the excess coating layer, it can scrape off the excessive coating more evenly, making the coating layer more evenly distributed on the substrate, improving the quality of the coating. Moreover, electromagnetic induction heating does not require an internal heating structure, simplifies the design of the comma knife, avoids equipment downtime and maintenance costs caused by heating module failures, and the maintenance cost of electromagnetic induction heating is relatively low, reducing its manufacturing complexity and cost. Additionally, electromagnetic induction heating has the characteristics of being fast and uniform, can quickly increase the temperature of the comma knife, meet the heating requirements during the coating process, and effectively reduce the subsequent coating drying time.

[0018] 3. The multi-drying coater, through the combined use of an adsorption magnet structure and a base magnet structure, controls the comma knife through an electromagnetic field, without physical contact adjustment, simplifies the equipment structure, thereby reducing the possibility of mechanical wear and failures, extending the service life of the equipment. At the same time, it makes the disassembly and replacement of the comma knife more convenient after wear, without additional mechanical adjustment steps, improving the maintenance efficiency. Moreover, through the periodic changing magnetic field generated by the adsorption magnet and the base magnet during rotation, it pushes the comma knife to reciprocate along the surface of the coated substrate, improving the contact between the coating material and the substrate, promoting the interaction between coating molecules and substrate molecules, enhancing the adhesion of the coating, and being able to timely correct the defective positions of the coating, reducing the secondary repair work caused by uneven coating, thus greatly improving the coating efficiency and coating quality.

[0019] 4. The multi-drying coater, through the combined use of a comma knife structure and a transfer roller structure, during the coating process, due to various factors such as the wear of the coating roller and the change in the viscosity of the coating material, etc., may cause minor defects in the coating. In the present invention, the reciprocating vibration generated by the two-sided comma knives vibrating in opposite directions can timely correct these defective positions, reducing the secondary repair work caused by uneven coating. And this reciprocating vibration can make the coating evenly distributed on the surface of the coated substrate. Especially, the accumulated coating material under the transfer roller due to the large pressure between the transfer roller and the support base will be more easily coated on the coated substrate under the action of vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structure schematic diagram of the multi-drying coater in the present invention.

[0021] Figure 2 It is a front view of the structure of the multi-drying coater in the present invention.

[0022] Figure 3 It is a three-dimensional schematic diagram of the coating structure in the present invention.

[0023] Figure 4 This is the front view of the coating structure in the present invention.

[0024] Figure 5 This is the cross-sectional view of the coating structure in the present invention.

[0025] Figure 6 This is the schematic diagram of the coating structure during coating processing in the present invention.

[0026] In the figure: 1, support plate body; 2, base material roller; 3, discharge roller; 4, composite dryer; 5, coated base material; 6, feed tension shaft; 7, coating mechanism; 71, transfer coating roller; 711, coating cavity; 712, discharge cavity; 713, discharge hole; 714, communication hole; 72, support base; 73, comma knife; 74, base magnet; 75, adsorption magnet; 76, sliding tool holder. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figures 1-6, a multi-drying coater, comprising a support plate body 1, a base material roller 2, a composite dryer 4, and a discharge roller 3. At both ends of the support plate body 1, a base material roller 2 wound with an initially unprocessed coating base material 5 and a discharge roller 3 wound with the processed base material are respectively rotatably connected. The base material roller 2 is responsible for providing the unprocessed coating base material 5, and the discharge roller 3 is responsible for collecting the processed base material. The continuous and stable conveying process is realized through the rotational connection on the support plate body 1 between the two. A composite dryer 4 is arranged between the base material roller 2 and the discharge roller 3. The composite dryer 4 is fixedly installed on the support plate body 1. The coating base material 5 on the base material roller 2 passes through the composite dryer 4 and is wound on the discharge roller 3. After the coating base material 5 is processed by the coating mechanism 7, it needs to be dried by the composite dryer 4 before it can be wound on the discharge roller 3 for subsequent processing or use. An inlet tension shaft 6 and an outlet tension shaft are arranged between the base material roller 2 and the composite dryer 4. The inlet tension shaft 6 and the outlet tension shaft can adjust the tension of the coating base material 5 to ensure that it remains stable and non-relaxed during the conveying process, thereby improving the coating quality. A coating mechanism 7 is arranged between the inlet tension shaft 6 and the outlet tension shaft. The coating mechanism 7 includes a transfer roller 71, a support base 72, and a comma knife 73. The coating base material 5 is arranged between the transfer roller 71 and the support base 72. The comma knife 73 is arranged on one side of the transfer roller 71. The comma knife 73 can closely adhere to the surface of the coating base material 5 to scrape the paint on the transfer roller 71 flat and evenly distribute it on the base material, thereby ensuring the uniformity and adhesion of the coating. The surface of the transfer roller 71 is provided with paint. As a key component of the coating mechanism 7, the paint provided on the surface of the transfer roller 71 will be evenly coated on the base material during rotation to form the required coating. The head of the comma knife 73 adheres above the coating base material 5. The head of the comma knife 73 adheres above the coating base material 5 and can closely contact the paint layer to scrape the paint flat and evenly distribute it by the movement of the knife. Ultrasonic vibration modules are arranged on both the upper and lower sides of the comma knife 73. The ultrasonic vibration modules can change the electromagnetic field around the comma knife 73 to generate high-frequency vibration on the surface of the knife. This vibration helps the paint molecules penetrate better into the base material and improves the adhesion of the coating. The comma knife 73 is internally provided with a magnetic core. The magnetic core can respond to the change of the electromagnetic field generated by the ultrasonic vibration module to drive the comma knife 73 to vibrate. The ultrasonic vibration modules change the electromagnetic field around the comma knife 73 to generate high-frequency vibration on the surface of the comma knife 73, thereby evenly covering the paint on the coating base material 5.

[0029] Please refer to Figures 3-6, the ultrasonic vibration module includes a base magnet 74 and an adsorption magnet 75. The base magnet 74 is slidably arranged below the support base 72, and both ends of the base magnet 74 are slidably connected to the support plate body 1. Such a design enables the base magnet 74 to flexibly adjust its position to cooperate with the adsorption magnet 75 to generate the required electromagnetic field, thereby driving the comma doctor blade 73 to vibrate at a high frequency. The sliding connection method ensures the stability and reliability of the base magnet 74 during the adjustment process. Inside the transfer roller 71, there are a cylindrical coating cavity 711 and an annular discharge cavity 712. The discharge cavity 712 is arranged between the transfer roller 71 and the coating cavity 711. The coating cavity 711 is used to store the coating, and the discharge cavity 712 is responsible for evenly delivering the coating to the surface of the transfer roller 71. This design ensures that the coating can be continuously and stably supplied to the coating substrate 5, thereby achieving a high-quality coating effect. An adsorption magnet 75 is arranged inside the discharge cavity 712. The adsorption magnet 75 is rotatably connected to both ends of the coating cavity 711. The adsorption magnet 75 and the base magnet 74 jointly generate an electromagnetic field. This electromagnetic field is not only used to drive the comma doctor blade 73 to vibrate but also can heat the coating cavity 711. The rotational connection method enables the adsorption magnet 75 to remain stable when the transfer roller 71 rotates. The magnetic fields generated by the adsorption magnet 75 and the base magnet 74 jointly act on the comma doctor blade 73. Both the adsorption magnet 75 and the base magnet 74 are electromagnets. The design of the electromagnet enables the magnetic field strength and direction to be flexibly adjusted by controlling the magnitude and direction of the current, thereby achieving precise control of the vibration frequency, amplitude, and angle of the comma doctor blade 73. When it generates an electromagnetic field, it causes the comma doctor blade 73 to vibrate. When the adsorption magnet 75 and the base magnet 74 generate an electromagnetic field, it heats the comma doctor blade 73 to make it heat up; by controlling the electromagnetic field strength and angle generated by the adsorption magnet 75 and the base magnet 74 on the comma doctor blade 73, the distance and angle between the blade tip of the comma doctor blade 73 and the coating substrate 5 are adjusted. The structure of the coating cavity 711 is made of ferromagnetic metal, and the ferromagnetic metal can generate a magnetic induction heating effect under the action of the electromagnetic field, thereby realizing the heating of the coating cavity 711. The heated coating is more likely to be evenly distributed on the transfer roller 71 and can better penetrate into the coating substrate 5.

[0030] Please refer to Figures 3-6, both the adsorption magnet 75 and the base magnet 74 can be rotated and adjusted to change the angle of the electromagnetic field on the comma knife 73. By adjusting the angles of the adsorption magnet 75 and the base magnet 74, the direction and magnitude of the electromagnetic field generated by them on the comma knife 73 can be changed, so as to achieve precise control of the vibration of the comma knife 73. Two groups of comma knives 73 are symmetrically arranged on both sides of the transfer roller 71. One group of comma knives 73 is arranged on the side where the coating substrate 5 has not been coated, and one group of comma knives 73 is arranged on the side after the transfer roller 71 has coated. On the side where the coating has not been processed, the comma knife 73 can pre-press the coating substrate 5 on the support base 72 and scrape off the excess part in the coating substrate 5; on the side after coating, the comma knife 73 further levels the coating. Two groups of base magnets 74 are symmetrically arranged on both sides of the transfer roller 71, and two groups of adsorption magnets 75 are symmetrically arranged in the discharge chamber 712; the electromagnetic field periods generated by the adsorption magnets 75 and the base magnets 74 on both sides are equal, and the current voltage changes are opposite in magnitude, so that the vibration frequencies of the comma knives 73 on both sides are equal and the vibration directions are opposite. This vibration is to generate a vibration cancellation effect during the coating process, thereby reducing the impact and damage on the coating substrate 5. When the comma knives 73 on both sides vibrate at equal frequencies but in opposite directions, their forces on the coating substrate 5 will cancel each other out, thereby reducing the friction and damage of the unilateral high-frequency vibration on the coating substrate 5. At the same time, this vibration method also helps the coating to be evenly distributed and penetrate on the coating substrate 5.

[0031] Please refer to Figures 1-6, both ends of the transfer coating roller 71 are rotatably connected to the support plate body 1, and the transfer coating roller 71 can slide in the vertical direction relative to the support plate body 1. The transfer coating roller 71 is rotatably connected to the support plate body 1, and the support base 72 is fixedly installed on the support plate body 1. The fixed installation of the support base 72 provides stable support, ensuring the stability and precision of the coating mechanism 7, thereby guaranteeing the coating quality. The coating chamber 711 is connected to a container containing the coating. The coating in the container is supplied to the transfer coating roller 71 through the coating chamber 711, facilitating the control and adjustment of the coating flow rate and coating thickness. The transfer coating roller 71 is rotatably connected to the discharge chamber 712, and a discharge hole 713 is provided at the bottom of the discharge chamber 712. The discharge hole 713 communicates with the surface of the transfer coating roller 71, and a communication hole 714 connected to the discharge chamber 712 is provided at the top of the coating chamber 711. This design ensures that the coating flows uniformly from the coating chamber 711 into the discharge chamber 712 and is evenly applied to the surface of the transfer coating roller 71 through the discharge hole 713. The rotatable connection and the design of the communicating holes enable the coating to be continuously and stably supplied to the transfer coating roller 71, ensuring the smooth progress of the coating process. Both ends of the comma knife 73 are rotatably connected to the sliding tool holder 76. The sliding tool holder 76 is slidably assembled on the support plate body 1. An elastic buffer structure is provided between the comma knife 73 and the sliding tool holder 76. The elastic buffer structure can effectively reduce the shaking caused by the high-frequency vibration of the comma knife 73, thereby improving the durability of the equipment. The elastic buffer structure can effectively reduce the shaking caused by the high-frequency vibration of the comma knife 73, improving the stability and durability of the equipment. It can also relieve the impact force during the coating process, protecting the comma knife 73 and the coated substrate 5 from damage, thereby extending the service life of the equipment. Since high-frequency vibration is one of the characteristics of the comma knife 73 during operation, excessive shaking will affect the coating effect and the equipment life. The elastic buffer structure reduces the impact of shaking on the equipment by absorbing and dispersing the vibration energy, thereby improving the stability and durability of the equipment.

[0032] Working principle: During the coating process, the coated substrate 5 is first conveyed to the coating structure position through the cooperation of the substrate roller 2 and the discharge roller 3, and the tension of the coated substrate 5 is controlled by the tension shaft 6. When the coated substrate 5 passes through the coating structure, it is coated. The coated substrate 5 after coating is then dried by the composite dryer 4 and wound up by the discharge roller 3.

[0033] Among them, when the coated substrate 5 is undergoing coating processing, the coated substrate 5 will pass through the coating mechanism 7. The transfer roller 71 will apply the coating on the surface of the coated substrate 5. Subsequently, the comma knife 73 will scrape off the coating layer and evenly apply it on the coated substrate 5. During the process of the comma knife 73 scraping off the excess coating layer, by energizing the base magnet 74 and the adsorption magnet 75, an electromagnetic field will be formed between them. In the electromagnetic field, the comma knife 73 will be subjected to a periodically changing force. This force is caused by the fluctuation of the electromagnetic field, and because the intensity and direction of the electromagnetic field will change with the change of the current. When the current changes at a high frequency, the electromagnetic field will also fluctuate at the corresponding frequency. And the comma knife 73, as a part of the electromagnetic field, will respond to the periodic changes therein. Due to the fluctuation of the electromagnetic field, the comma knife 73 will be subjected to a continuously changing force, causing it to start vibrating at the frequency of the electromagnetic field. This vibration can make the comma knife 73 keep uniform when scraping off the excess coating layer. And by adjusting the magnitude, direction and frequency of the current of the base magnet 74 and the adsorption magnet 75, the vibration amplitude and frequency of the comma knife 73 can be precisely controlled. This high-frequency vibration can ensure that the comma knife 73 scrapes off too much coating more evenly during the scraping process, making the coating layer more evenly distributed on the substrate. Since the thickness consistency of the coating is significantly improved, the quality and performance of the product are also correspondingly improved. At the same time, the high-frequency vibration can also break the bubbles in the coating layer, cause the bubbles to quickly dissipate, and evenly disperse the impurities into the coating or scrape them off from the surface of the coating. When the vibration energy is transmitted to the surface of the substrate, it can also promote the intermolecular interaction between the coating and the substrate, enhancing the bonding force between the coating and the substrate. Therefore, the adhesion of the coating on the substrate is improved, and the durability and protective performance of the coating are also correspondingly enhanced.

[0034] When an electromagnetic field is generated between the base magnet 74 and the adsorption magnet 75, eddy currents will be generated inside the comma knife 73 due to the changing electromagnetic field. These eddy currents flow inside the comma knife 73 and heat up due to resistance, thereby increasing the surface temperature of the comma knife 73. After the temperature of the comma knife 73 rises, due to the thermal expansion effect and the change in the viscosity of the coating, the knife can scrape off excessive coating more evenly when scraping off the excess coating layer, making the coating layer more evenly distributed on the substrate, and reducing the subsequent coating drying time, thereby improving the drying efficiency. Traditional heating methods require the installation of a heating module inside the comma knife 73, which not only increases the complexity and cost of the comma knife 73, but may also affect its service life. With electromagnetic induction heating, the comma knife 73 does not require an internal heating structure, reducing its manufacturing complexity and cost. At the same time, electromagnetic induction heating is fast and uniform, and can quickly increase the temperature of the comma knife 73 to meet the heating requirements during the coating process. Since there is no need to install a heating module inside the comma knife 73, the cost of materials and the manufacturing process is reduced. The maintenance cost of electromagnetic induction heating is also relatively low because it does not require frequent replacement of heating elements like traditional heating methods. In addition, since electromagnetic induction heating can quickly and evenly increase the temperature of the comma knife 73, the overall efficiency and performance of the coater are also improved.

[0035] By adjusting the magnitude and direction of the current generated by the base magnet 74 and the adsorption magnet 75, the direction and intensity of the electromagnetic field can be changed, thereby enabling the adjustment of the scraping distance and angle between the comma knife 73 and the coated substrate 5 to be processed. Moreover, traditional mechanical adjustment methods require physical contact, while electromagnetic field control does not require contact, reducing the possibility of mechanical wear and failure. By directly controlling the comma knife 73 through the electromagnetic field, no additional motor or other drive structure is required, simplifying the equipment structure and reducing costs. At the same time, due to the controllability of the electromagnetic field, the working state of the comma knife 73 can be quickly adjusted according to different coating requirements, improving the adaptability and flexibility of the equipment. Moreover, this non-contact structure makes the disassembly and replacement of the comma knife 73 more convenient, without additional mechanical adjustment steps. During the coating process, since both ends of the adsorption magnet 75 are rotatably connected to the discharge chamber 712, when the coating roller rotates or an additional drive structure is installed, the adsorption magnet 75 can be driven to rotate differentially with the base magnet 74. When the adsorption magnet 75 and the base magnet 74 are rotating, the magnetic field generated between them will also change periodically, thereby driving the comma knife 73 to reciprocate along the surface of the coated substrate 5. This reciprocating smoothing can improve the contact between the coating and the substrate, thereby promoting the interaction between coating molecules and substrate molecules, enhancing the adhesion of the coating, and correcting the defective positions of the coating, reducing secondary repair work caused by uneven coating, and improving the coating efficiency.

[0036] Moreover, during the process of the adsorption magnet 75 generating an electromagnetic field, it can simultaneously heat the coating cavity 711 provided in the transfer roller 71, thereby realizing preheating of the coating from the source, reducing the energy consumption and time cost in the subsequent drying process. After preheating, the coating becomes more fluid and its viscosity decreases. This is beneficial to the uniform distribution of the coating on the transfer roller 71 and the uniform coating on the coated substrate 5. And the heated coating is more likely to penetrate the surface of the substrate and form a closer bond with the substrate. This can not only improve the adhesion of the coating, but also reduce the bubbles and impurities in the coating, thereby improving the coating quality.

[0037] When the coated substrate 5 passes through the comma scrapers 73 on both sides, since the comma scrapers 73 on both sides vibrate at the same frequency but in opposite directions, the coated substrate 5 will be subjected to forces from opposite directions on both sides when passing through, thereby generating minute reciprocating vibrations. Such reciprocating vibrations can make the coating evenly distributed on the surface of the coated substrate 5. In particular, the accumulated coating under the transfer roller 71 due to the greater pressure between the transfer roller 71 and the support base 72 is more likely to be coated on the coated substrate 5 under the action of the vibrations.

[0038] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0039] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multiple drying coating machine, comprising a support plate body (1), a substrate roller (2), a composite dryer (4), and a discharge roller (3), wherein the two ends of the support plate body (1) are rotatably connected to the substrate roller (2) and the discharge roller (3), a composite dryer (4) is arranged between the substrate roller (2) and the discharge roller (3), the composite dryer (4) is fixedly mounted on the support plate body (1), the coated substrate (5) on the substrate roller (2) passes through the composite dryer (4) and is wound on the discharge roller (3), a feed tension shaft (6) and a discharge tension shaft are arranged between the substrate roller (2) and the composite dryer (4), and the machine is characterized in that: A coating mechanism (7) is arranged between the feed tension shaft (6) and the discharge tension shaft, the coating mechanism (7) comprising a transfer roller (71), a support base (72), and a comma scraper (73), the coating substrate (5) being arranged between the transfer roller (71) and the support base (72), the comma scraper (73) being arranged on one side of the transfer roller (71), the surface of the transfer roller (71) being provided with a coating, the blade head of the comma scraper (73) being attached above the coating substrate (5), and ultrasonic vibration modules being arranged on the upper and lower sides of the comma scraper (73), the comma scraper (73) being provided with a built-in magnetic core, the ultrasonic vibration module changing the electromagnetic field around the comma scraper (73) so that the surface of the comma scraper (73) generates high-frequency vibration; The ultrasonic vibration module comprises a base magnet (74) and an adsorption magnet (75); the base magnet (74) is slidably arranged below the support base (72), and two ends of the base magnet (74) are slidably connected to the support plate (1); a cylindrical coating cavity (711) and an annular material discharge cavity (712) are coaxially arranged inside the transfer roller (71); the material discharge cavity (712) is arranged between the transfer roller (71) and the coating cavity (711); the adsorption magnet (75) is arranged in the material discharge cavity (712); the adsorption magnet (75) is rotatably connected to two ends of the coating cavity (711); the magnetic field generated by the adsorption magnet (75) and the base magnet (74) acts on the comma scraper (73); the adsorption magnet (75) and the base magnet (74) are both electromagnets, and when they generate an electromagnetic field, the comma scraper (73) is vibrated.

2. A multiple drying coating machine according to claim 1, characterized in that: When the adsorption magnet (75) and the base magnet (74) generate an electromagnetic field, the comma scraper (73) is heated to generate heat; and by controlling the intensity and angle of the electromagnetic field generated by the adsorption magnet (75) and the base magnet (74) on the comma scraper (73), the distance and angle between the blade head of the comma scraper (73) and the coating substrate (5) are adjusted.

3. A multiple drying coating machine according to claim 1, characterized in that: The transfer roller (71) is rotatably connected to the discharge chamber (712), and a discharge hole (713) is provided at the bottom of the discharge chamber (712), the discharge hole (713) is communicated with the surface of the transfer roller (71), and a connecting hole (714) is provided at the top of the coating chamber (711) and is communicated with the discharge chamber (712).

4. A multiple drying coating machine according to claim 1, characterized in that: Both ends of the comma scraper (73) are rotatably connected to a sliding knife holder (76), the sliding knife holder (76) is slidably mounted on the support plate body (1), and an elastic buffer structure is provided between the comma scraper (73) and the sliding knife holder (76).

5. A multiple drying coating machine according to claim 1, characterized in that: The coating cavity (711) structure is made of ferromagnetic metal, and the adsorption magnet (75) heats the coating cavity (711) when generating an electromagnetic field.

6. A multiple drying coating machine according to claim 1, characterized in that: Both ends of the transfer roller (71) are rotatably connected to the support plate body (1), and the transfer roller (71) is capable of sliding in a vertical direction relative to the support plate body (1).

7. A multiple drying coating machine according to claim 1, characterized in that: The comma scrapers (73) are symmetrically arranged in two groups on both sides of the transfer roller (71), the base magnets (74) are symmetrically arranged in two groups on both sides of the transfer roller (71), and the adsorption magnets (75) are symmetrically arranged in two groups in the discharge chamber (712); the electromagnetic fields generated by the adsorption magnets (75) and the base magnets (74) on both sides have equal periods and opposite current and voltage changes, so that the vibration frequencies generated by the comma scrapers (73) on both sides are equal and the vibration directions are opposite.

8. A multiple drying coating machine according to claim 1, characterized in that: The transfer roller (71) is rotatably connected to the support plate body (1), and the support base (72) is fixedly mounted on the support plate body (1).

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