Negative pressure device and gravure coating equipment

Abstract

The utility model provides a negative pressure device and gravure coating equipment, and relates to the technical field of batteries. The negative pressure device comprises a fixing frame, a suction head, a negative pressure main body and an adjusting piece, wherein the suction head is arranged on the fixing frame; a suction nozzle is arranged on the suction head and faces the scraper. The negative pressure body is connected with the suction head, and the adjusting piece is connected with the suction head and used for adjusting the relative position of the suction nozzle and the scraper. The negative pressure device can absorb liquid drops and bubbles on the scraper, so that stripes and pits are prevented from being formed on the foil after coating, and the coating quality of the foil is improved.

Description

Technical Field

[0001] This utility model relates to the field of gravure coating technology, and in particular to a negative pressure device and gravure coating equipment. Background Technology

[0002] Gravure printing technology has been applied to the coating process of battery electrodes. However, when using gravure printing for paste coating, the presence of droplets on the squeegee can lead to uneven paste thickness on the electrode, resulting in streaks—obvious lines in the coating layer on the foil. Additionally, pits can appear on the electrode due to air bubbles formed during the coating process. Battery electrodes with streaks and pits can negatively impact the battery's cycle performance and stability. Utility Model Content

[0003] The purpose of this invention is to provide a negative pressure device and a gravure coating equipment, which can remove droplets and bubbles on the doctor blade, improve the phenomenon of stripes and pits on foil in the coating process, and improve the coating quality of electrode sheets and battery performance.

[0004] In a first aspect, this utility model provides a negative pressure device, comprising:

[0005] Fixture;

[0006] A suction head is mounted on the fixed frame; the suction head is equipped with a suction nozzle, which is positioned facing the scraper.

[0007] Negative pressure body; the negative pressure body and the suction head are connected;

[0008] An adjusting component, which is connected to the suction head, is used to adjust the relative position of the suction nozzle and the scraper.

[0009] In an optional embodiment, the suction head has an adsorption surface on which the suction nozzle is disposed; the suction nozzle includes an adsorption groove and an adsorption hole that are interconnected; the adsorption groove is formed on the adsorption surface, and the adsorption hole is formed at the bottom of the adsorption groove; the groove wall of the adsorption groove and the adsorption surface are arranged at an angle.

[0010] In an optional embodiment, the suction head is provided with an adsorption chamber and a pipe connection port, and the adsorption surface is provided with a plurality of suction nozzles;

[0011] The suction holes of the multiple suction nozzles are respectively connected to the suction chamber, one end of the pipe connection port is connected to the suction chamber, and the other end of the pipe connection port is connected to the negative pressure body.

[0012] In an optional embodiment, the suction surface of the suction head is inclined relative to the horizontal plane.

[0013] In an optional embodiment, the adjusting member includes a first adjusting rod and a second adjusting rod that are rotatably connected, the first adjusting rod being connected to the fixing frame and the second adjusting rod being connected to the suction head.

[0014] In an optional embodiment, the adjusting member further includes a third adjusting rod, one end of which is rotatably connected to the first adjusting rod and the other end of which is rotatably connected to the second adjusting rod.

[0015] In an optional embodiment, the suction head is provided with a mounting part, which is connected to the second adjusting rod.

[0016] In an optional embodiment, a negative pressure tube is also included, one end of which is connected to the negative pressure body and the other end of which is connected to the suction head.

[0017] Secondly, this utility model provides a gravure coating device, including a scraper and a negative pressure device as described in any of the foregoing embodiments, wherein the scraper is disposed on the fixed frame.

[0018] In an optional embodiment, a gravure roller is also included, the scraper being used to smooth the slurry within the grooves of the gravure roller.

[0019] The negative pressure device and gravure coating equipment provided in this embodiment of the invention have the following advantages:

[0020] The negative pressure device and gravure coating equipment provided in this embodiment of the invention use a suction nozzle to remove droplets and air bubbles from the doctor blade, avoiding the pitting problems caused by streaks and air bubbles on the foil during the coating process. This ensures the uniformity and consistency of the coating during the gravure coating process, which is beneficial to improving the cycle stability and safety of the battery. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the overall structure of the negative pressure device provided in this embodiment of the utility model;

[0023] Figure 2 A side view of the negative pressure device provided in this embodiment of the utility model;

[0024] Figure 3A schematic diagram of the suction head of the negative pressure device provided in this embodiment of the utility model;

[0025] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0026] Figure 5 A schematic diagram of the suction head of the negative pressure device provided in an embodiment of this utility model from another perspective;

[0027] Figure 6 A schematic diagram of the overall structure of the gravure coating equipment provided in this embodiment of the utility model;

[0028] Figure 7 This is a side view of the gravure coating equipment provided in an embodiment of the present invention.

[0029] Icons: 100-Negative pressure device; 110-Fixed frame; 120-Suction head; 121-Adsorption surface; 122-Suction nozzle; 123-Adsorption tank; 124-Adsorption hole; 125-Pipe connection port; 126-Mounting part; 130-Negative pressure body; 140-Adjusting component; 141-First adjusting rod; 142-Second adjusting rod; 143-Third adjusting rod; 150-Negative pressure pipe; 200-Gravure coating equipment; 210-Scraper; 211-Inclined surface; 220-Gravure roller; 230-Pressure roller; 240-Foil material. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] Combination Figures 1 to 2 The present invention provides a negative pressure device 100 for use on a gravure coating equipment 200. The negative pressure device 100 can absorb droplets and air bubbles on the doctor blade 210, thereby preventing stripes and pits from forming after the foil 240 is coated, and improving coating quality and battery performance.

[0038] The negative pressure device 100 includes a fixed frame 110, a suction head 120, a negative pressure body 130, and an adjusting component 140. The suction head 120 is mounted on the fixed frame 110; the suction head 120 is equipped with a suction nozzle 122, which faces the doctor blade 210. The negative pressure body 130 is connected to the suction head 120, and the adjusting component 140 is connected to the suction head 120 to adjust the relative position of the suction nozzle 122 and the doctor blade 210. The negative pressure device 100 can suck up droplets and air bubbles on the doctor blade 210, ensuring the uniformity of the coating slurry in the groove of the gravure roller 220, thereby avoiding the formation of textures or pits on the electrode sheet after coating and improving the coating quality of the electrode sheet.

[0039] Combination Figures 3 to 5 The suction head 120 has an adsorption surface 121 for setting the suction nozzle 122. The adsorption surface 121 faces the scraper 210. The suction nozzle 122 includes an adsorption groove 123 and an adsorption hole 124 that are interconnected. The adsorption groove 123 is formed on the adsorption surface 121, and the adsorption hole 124 is formed at the bottom of the adsorption groove 123; the groove wall of the adsorption groove 123 and the adsorption surface 121 are set at an angle. This suction nozzle 122 is similar to a trumpet-shaped structure, which can improve the adsorption force and ensure effective removal of droplets and air bubbles on the scraper 210.

[0040] Optionally, the cross-sectional shapes of the adsorption groove 123 and the adsorption hole 124 can be circular, elliptical, triangular, quadrilateral, pentagonal, hexagonal, or other arbitrary shapes. In this embodiment, the cross-sectional shapes of the adsorption groove 123 and the adsorption hole 124 are both circular. The diameter of the groove opening of the adsorption groove 123 is approximately 10 mm. The diameter of the bottom of the adsorption groove 123 is approximately equal to the diameter of the adsorption hole 124, approximately 7 mm. The wall of the adsorption groove 123 is approximately conical, meaning that the cross-section of the adsorption groove 123 gradually decreases in size from the groove opening to the bottom. The angle of inclination of the wall of the adsorption groove 123 relative to the adsorption surface 121 is approximately 30 degrees. Multiple suction nozzles 122 are provided on the adsorption surface 121, with a spacing of approximately 2 mm between adjacent suction nozzles 122. This means that the edges of the openings of two adjacent adsorption grooves 123 are approximately 2 mm apart. In other words, the multiple suction nozzles 122 are evenly spaced on the adsorption surface 121. The cross-sectional shape, size, tilt angle, spacing and other parameters of the above-mentioned suction nozzle 122 can also be flexibly set in other embodiments, and are not specifically limited here.

[0041] Optionally, the suction head 120 is provided with an adsorption chamber and a pipe connection port 125. The pipe connection port 125 and the suction nozzle 122 are located on two opposite surfaces of the suction head 120. Of course, in some embodiments, the pipe connection port 125 and the suction nozzle 122 are located on two adjacent surfaces of the suction head 120; this is not specifically limited here. The adsorption holes 124 of the plurality of suction nozzles 122 are respectively connected to the adsorption chamber, one end of the pipe connection port 125 is connected to the adsorption chamber, and the other end of the pipe connection port 125 is connected to the negative pressure body 130.

[0042] In this embodiment, a negative pressure pipe 150 is also included. One end of the negative pressure pipe 150 is connected to the negative pressure body 130, and the other end is connected to the pipe connection port 125 on the suction head 120. The negative pressure body 130 can be a negative pressure pump or the like. The negative pressure generated by the negative pressure body 130 can be transmitted to the suction nozzle 122 through the negative pressure pipe 150. In this way, the suction nozzle 122 can adsorb and remove droplets and air bubbles on the doctor blade 210, thereby ensuring the uniformity of the slurry in the groove of the gravure roller 220, improving the streaks and pits that occur in the coating process, and thus improving the coating quality.

[0043] Optionally, the suction surface 121 of the suction head 120 is inclined relative to the horizontal plane. It can be understood that the scraper 210 has an inclined surface 211, and the suction surface 121 and the inclined surface 211 on the scraper 210 are arranged opposite each other, and the inclination angles of the two are the same. This is beneficial for better suction and removal of droplets and air bubbles on the inclined surface 211 of the scraper 210.

[0044] Optionally, the adjusting component 140 includes a first adjusting rod 141 and a second adjusting rod 142 rotatably connected. The first adjusting rod 141 is connected to the fixing frame 110, and the second adjusting rod 142 is connected to the suction head 120. The first adjusting rod 141 and the second adjusting rod 142 rotate relative to each other, which can adjust the angle and spacing between the suction head 120 and the scraper 210, thereby better adapting to the scraper 210 and effectively removing droplets and air bubbles from the scraper 210.

[0045] To improve the flexibility and controllability of the suction head 120 adjustment, the adjusting component 140 also includes a third adjusting rod 143. One end of the third adjusting rod 143 is rotatably connected to the first adjusting rod 141, and the other end is rotatably connected to the second adjusting rod 142. The use of three adjusting rods enables free adjustment of the suction head 120, allowing for free control of the distance between the suction head 120 and the doctor blade 210, the distance between the suction head 120 and the gravure roller 220, etc., resulting in more flexible and precise adjustment.

[0046] Of course, in some other embodiments, the number of adjusting rods can be one, two, four, five or other values, and the adjustment form is not limited to telescopic, rotation, translation, etc., which are not specifically limited here.

[0047] Optionally, the suction head 120 is provided with a mounting part 126, which is connected to the second adjusting rod 142. The number of mounting parts 126 can be one, two, or more. The number of mounting parts 126 is the same as the number of adjusting members 140, that is, each adjusting member 140 is connected to one mounting part 126.

[0048] In this embodiment, each mounting part 126 includes two opposing protrusions, each with a first mounting hole located on the same axis. The second adjusting rod 142 has a second mounting hole coaxial with the first mounting holes. The first and second mounting holes are for a connecting bolt to pass through. The connecting bolt passes through one of the first mounting holes, the second mounting hole, and the other first mounting hole in sequence to achieve a rotatable connection between the second adjusting rod 142 and the suction head 120. The connecting bolt is locked at both ends in the axial direction by nuts to achieve axial limitation.

[0049] It is understood that the connection method between the first adjusting rod 141 and the fixing frame 110 is similar to the connection method between the second adjusting rod 142 and the suction head 120. The connection method at both ends of the third adjusting rod 143 is similar to the above connection method, or other hinge methods may be used, which are not specifically limited here.

[0050] The negative pressure device 100 provided in this embodiment can be adapted to coating production requirements of different coating thicknesses according to experimental needs, and it provides good coating uniformity. The suction of slurry droplets and air bubbles on the doctor blade 210 can also be achieved by adjusting the airflow of the negative pressure body 130, effectively solving the problems of streaks and pits that occur in gravure coating. Furthermore, it has a simple and reliable structure, employing detachable methods such as bolt connections, making disassembly convenient and facilitating periodic cleaning of the suction head 120 without affecting its subsequent reuse.

[0051] The working principle of the negative pressure device 100 provided in this embodiment is roughly as follows:

[0052] In use, first place the negative pressure body 130 stably on the ground. Then, connect both ends of the negative pressure tube 150 to the pipe connection ports 125 of the negative pressure body 130 and the suction head 120, respectively, and check that the connections are secure. Next, plug in the power supply to the negative pressure body 130 and turn on the switch. Adjust the position of the suction head 120 using the adjusting component 140 to ensure that the suction head 120 can suck up droplets and air bubbles on the scraper 210. Finally, fix the position of the suction head 120.

[0053] Negative pressure is generated by the negative pressure body 130 and transmitted to the suction nozzle 122 through the negative pressure pipe 150. The suction nozzle 122 draws the air bubbles and slurry droplets on the scraper 210 into the adsorption chamber inside the suction head 120. Then, the droplets and air bubbles enter the main body of the equipment through the negative pressure pipe 150. After filtration and separation, the clean air is finally discharged and the slurry is collected for reuse.

[0054] Combination Figures 6 to 7This utility model embodiment also provides a gravure coating equipment 200, including a doctor blade 210, a gravure roller 220, a pressure roller 230, and the aforementioned negative pressure device 100. The doctor blade 210 is mounted on a fixed frame 110. The doctor blade 210 is used to scrape the slurry in the groove of the gravure roller 220 flat.

[0055] Optionally, the mounting bracket 110 has a mounting groove, and the scraper 210 is disposed in the mounting groove, with a portion extending out of the mounting groove. The portion of the scraper 210 extending out of the mounting groove is used to smooth the slurry within the groove of the gravure roller 220. The scraper 210 and the mounting bracket 110 can be connected by snap-fit, bolt connection, riveting, bonding, magnetic adsorption connection, or welding. In this embodiment, after the scraper 210 is installed into the mounting groove, screws on the mounting bracket 110 are used to lock the groove walls on both sides of the mounting groove to press and fix the scraper 210. With this connection method, the scraper 210 is detachable, facilitating later cleaning, maintenance, or replacement.

[0056] Foil 240 is positioned between gravure roller 220 and pressure roller 230, with coating paste contained in the groove of gravure roller 220. During the relative rotation of gravure roller 220 and pressure roller 230, the paste in the groove is coated onto foil 240. A doctor blade 210 is used to smooth the paste in the groove, and a suction head 120 in the negative pressure device 100 is used to remove droplets and air bubbles from the doctor blade 210, ensuring the uniformity of the paste in the groove and effectively improving streaks and pits in the coating process.

[0057] The negative pressure device 100 and gravure coating equipment 200 provided in this embodiment of the invention have the following beneficial effects:

[0058] The negative pressure device 100 solves the problem of streaks and air bubbles on the foil 240 during gravure coating, ensuring the uniformity and consistency of coating. On the one hand, it reduces material waste caused by uneven coating, saving production costs and improving production efficiency; on the other hand, it reduces battery quality risks and improves battery cycle stability and safety. Furthermore, the negative pressure device 100 has a reliable structure, is easy to connect, and uses bolt connections or other detachable methods for easy disassembly and regular cleaning of the suction head 120, without affecting its subsequent reuse.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of this utility model.

Claims

1. A negative pressure device, characterized in that, include: Fixture (110); A suction head (120) is mounted on the fixing frame (110); the suction head (120) is provided with a suction nozzle (122) which faces the scraper (210); Negative pressure body (130); the negative pressure body (130) and the suction head (120) are connected; An adjusting member (140) is connected to the suction head (120) and is used to adjust the relative position of the suction nozzle (122) and the scraper (210).

2. The negative pressure device of claim 1, wherein, The suction head (120) has an adsorption surface (121) on which the suction nozzle (122) is disposed; the suction nozzle (122) includes an adsorption groove (123) and an adsorption hole (124) that are interconnected; the adsorption groove (123) is opened on the adsorption surface (121), and the adsorption hole (124) is opened at the bottom of the adsorption groove (123); the groove wall of the adsorption groove (123) and the adsorption surface (121) are arranged at an angle.

3. The negative pressure device of claim 2, wherein, The suction head (120) is provided with an adsorption chamber and a pipe connection port (125), and a plurality of suction nozzles (122) are provided on the adsorption surface (121); The suction holes (124) of the plurality of suction nozzles (122) are respectively connected to the suction chamber, one end of the pipe connection port (125) is connected to the suction chamber, and the other end of the pipe connection port (125) is connected to the negative pressure body (130).

4. The negative pressure device of claim 2, wherein, The suction surface (121) of the suction head (120) is inclined relative to the horizontal plane.

5. The negative pressure device according to claim 1, characterized in that, The adjusting member (140) includes a first adjusting rod (141) and a second adjusting rod (142) that are rotatably connected. The first adjusting rod (141) is connected to the fixing frame (110), and the second adjusting rod (142) is connected to the suction head (120).

6. The negative pressure device of claim 5, wherein, The adjusting member (140) further includes a third adjusting rod (143), one end of which is rotatably connected to the first adjusting rod (141), and the other end of which is rotatably connected to the second adjusting rod (142).

7. The negative pressure device of claim 5, wherein, The suction head (120) is provided with a mounting part (126), which is connected to the second adjusting rod (142).

8. The negative pressure device of any one of Claims 1-7, wherein, It also includes a negative pressure tube (150), one end of which is connected to the negative pressure body (130) and the other end is connected to the suction head (120).

9. An intaglio coating apparatus characterized by, It includes a scraper (210) and a negative pressure device as described in any one of claims 1 to 8, wherein the scraper (210) is disposed on the fixed frame (110).

10. The gravure coater according to claim 9, wherein It also includes a gravure roller (220), and the scraper (210) is used to scrape the paste in the groove of the gravure roller (220) flat.

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