Squeezing type coating head structure for silica gel film production

Abstract

The invention provides an extrusion type coating head structure for silica gel film production, and belongs to the technical field of coating head structures, the extrusion type coating head structure comprises an upper die head and a lower die head arranged below the upper die head, and one end of the upper die head is provided with an upper die lip. According to the device, fluid is smoothly transited through the arc-shaped grooves formed in the corners, the situation that the speed of the fluid is suddenly reduced to form a low-speed retention area due to the corners is avoided, meanwhile, the fluid adhering to the arc-shaped grooves is scraped in cooperation with continuous rotation of a scraper, the fluid is prevented from being accumulated and solidified on an arc line, and therefore the flowing speed of the fluid is guaranteed; fluid at the corner is guided and pushed through the flow guide cover, the flowing speed of the fluid at the corner is increased, accumulation caused by too low flowing speed for a long time is avoided, and therefore the discharging speed of the fluid is increased, the flow guide groove is formed in one end of the arc-shaped groove, and the fluid can be guided to rapidly enter the position between the scraper and the flow guide cover when flowing along the inner wall; and the flowing speed of the fluid is further increased, and subsequent extrusion coating is helped to be better carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of coating head structures, and more particularly, to an extrusion coating head structure for silicone film production. Background Art

[0002] With the progress of technology, coating technology has become an indispensable part of many high-end manufacturing industries. Especially in the fields of new energy, microelectronics, etc., the requirement for the accuracy of coating thickness control is increasing day by day. Traditional methods such as roll coating and spray coating are difficult to meet the high standards of these industries. Therefore, the development of more precise and stable coating technologies has become the focus of research. Currently, the mainstream coating technologies on the market include, but are not limited to, slit extrusion coating, rotary jet coating, blade coating, etc. Among them, slit extrusion coating has received extensive attention and application because it can achieve stable and uniform coating effects within a wide working range.

[0003] In the prior art, the flow channels of traditional extrusion coating heads often adopt right-angle or acute-angle designs at positions such as corners and flow dividers. After the slurry enters from the feed port, at the corners of the flow channel, due to the sudden change in the flow direction, some of the slurry is difficult to turn smoothly, easily forming regions with slow flow velocity, resulting in vortex and stagnant flow regions, causing slurry accumulation and retention. As the slurry in the stagnant dead corners continues to accumulate, it will gradually block the flow channel, leading to abnormal coating. How to invent an extrusion coating head structure for silicone film production to solve these problems has become an urgent problem for those skilled in the art. Summary of the Invention

[0004] To make up for the above deficiencies, the present invention provides an extrusion coating head structure for silicone film production, aiming to solve the problem that the flow channels of traditional extrusion coating heads often adopt right-angle or acute-angle designs at positions such as corners and flow dividers. After the slurry enters from the feed port, at the corners of the flow channel, due to the sudden change in the flow direction, some of the slurry is difficult to turn smoothly, easily forming regions with slow flow velocity, resulting in vortex and stagnant flow regions, causing slurry accumulation and retention. As the slurry in the stagnant dead corners continues to accumulate, it will gradually block the flow channel, leading to abnormal coating.

[0005] The present invention is implemented as follows: The present invention provides an extrusion coating head structure for silicone film production, including an upper die head and a lower die head arranged below the upper die head. One end of the upper die head is equipped with an upper die lip; One end of the lower die head is equipped with a lower die lip. A die pad is installed between the lower die head and the upper die head. One end of the lower die head is provided with a feed port. One end of the feed port is provided with a feed cavity. An arc-shaped groove is provided on one side of the feed cavity. A cleaning roller is installed on one side of the arc-shaped groove. A motor is installed on the outer wall of one side of the lower die head.

[0006] Preferably, the upper die head and the lower die head are fixed by bolts and nuts, and the die pad seals between the die heads.

[0007] Preferably, the arc-shaped groove is opened at the corner position close to the feeding cavity. Both side walls at the two ends of the cleaning roller are rotatably connected to the inner wall of the feeding cavity. A plurality of scraping blades are installed on the surface of the cleaning roller, and the output end of the motor is fixedly connected to one end of the cleaning roller.

[0008] Preferably, a flow guide cover is fixedly connected to the inner wall of the feeding cavity on the side close to the cleaning roller. The flow guide cover is an arc-shaped plate. A flow guide groove is opened at one end of the feeding cavity close to the arc-shaped groove, and one end of the flow guide groove faces the flow guide cover.

[0009] Preferably, one end of the flow guide cover is fixedly connected to a flow guide plate. A first fixing frame and a second fixing frame are respectively fixedly connected to the outer wall on the side of the flow guide plate close to the lower die head.

[0010] Preferably, a first knife net is fixedly connected to the inner wall of the first fixing frame, and a second knife net is fixedly connected to the inner wall of the second fixing frame. Both the first knife net and the second knife net are composed of a plurality of blades arranged vertically and alternately. The gap between the blades in the first knife net is larger than the gap in the second knife net.

[0011] By adopting the above technical solution, the arc-shaped groove provided at the corner smoothly transitions the fluid, avoiding the sudden drop in the fluid velocity caused by the corner to form a low-velocity stagnant area. At the same time, in cooperation with the continuous rotation of the scraping blade, the fluid adhering to the arc-shaped groove is scraped off, preventing the fluid from accumulating and solidifying on the arc, thereby ensuring the flow velocity of the fluid. The flow guide cover guides and pushes the fluid at the corner, accelerating the flow velocity of the fluid at the corner and avoiding long-term accumulation due to too low flow velocity, thereby improving the discharging speed of the fluid. The flow guide groove provided at one end of the arc-shaped groove can guide the fluid to quickly enter between the scraping blade and the flow guide cover when the fluid flows along the inner wall, further increasing the flow velocity of the fluid and helping to better perform extrusion coating subsequently.

[0012] Preferably, an installation groove is opened on one side of the upper die head. The installation groove is composed of a semi-circle and an arc. A flow guide roller is rotatably connected to the inner wall of the installation groove, and a plurality of blades are fixedly connected to the side wall of the flow guide roller.

[0013] By adopting the above technical solution, a diversion roller is arranged in the installation groove formed in the upper die head. When the fluid flowing above the diversion plate acts on the blades on the outer side of the diversion roller, it drives the diversion roller to rotate. When the blades rotate, they push the surrounding fluid to accelerate the flow, increasing the speed of the fluid in the surrounding area, enhancing the overall fluidity, reducing stratification and non-uniformity caused by flow rate differences, providing a stable and uniform fluid supply for subsequent coating. At the same time, when the blades rotate, the components in the fluid can be more evenly mixed and dispersed, avoiding the phenomenon of too high or too low local component concentration, and further ensuring the quality of subsequent coating.

[0014] The beneficial effects of the present invention are as follows: The arc-shaped groove provided at the corner smoothes the transition of the fluid, preventing the fluid from suddenly dropping in speed at the corner to form a low-speed stagnant area. At the same time, in cooperation with the continuous rotation of the scraper, the fluid adhering to the arc-shaped groove is scraped off to prevent the fluid from accumulating and solidifying on the arc, thereby ensuring the flow rate of the fluid. The diversion cover guides and pushes the fluid at the corner, accelerating the flow rate of the fluid at the corner and preventing long-term accumulation due to too low flow rate, thereby increasing the discharge rate of the fluid. The diversion groove provided at one end of the arc-shaped groove can guide the fluid to quickly enter between the scraper and the diversion cover when the fluid flows along the inner wall, further increasing the flow rate of the fluid and helping to better perform extrusion coating in the subsequent process; A diversion roller is arranged in the installation groove formed in the upper die head. When the fluid flowing above the diversion plate acts on the blades on the outer side of the diversion roller, it drives the diversion roller to rotate. When the blades rotate, they push the surrounding fluid to accelerate the flow, increasing the speed of the fluid in the surrounding area, enhancing the overall fluidity, reducing stratification and non-uniformity caused by flow rate differences, providing a stable and uniform fluid supply for subsequent coating. At the same time, when the blades rotate, the components in the fluid can be more evenly mixed and dispersed, avoiding the phenomenon of too high or too low local component concentration, and further ensuring the quality of subsequent coating. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of an extrusion coating head for silicone film production provided by an embodiment of the present invention; Figure 2 It is a cross-sectional view of an extrusion coating head for silicone film production provided by an embodiment of the present invention; Figure 3 It is a structure of an extrusion coating head for producing a silicone film provided by an embodiment of the present invention Figure 2 Enlarged view of the structure in area A; Figure 4 It is a structure of an extrusion coating head for producing a silicone film provided by an embodiment of the present invention Figure 3 Enlarged view of the structure in area B; Figure 5 Half-sectional view of a structure of an extrusion coating head for producing a silicone film provided by an embodiment of the present invention; Figure 6 It is a structure of an extrusion coating head for producing a silicone film provided by an embodiment of the present invention Figure 5 Enlarged view of the structure in area C.

[0017] In the figure: 1. Upper die head; 11. Upper die lip; 12. Installation groove; 13. Deflector roll; 14. Blade; 2. Lower die head; 21. Lower die lip; 22. Feed inlet; 23. Feed chamber; 231. Arc groove; 232. Flow guide groove; 24. Flow guide cover; 241. Flow guide plate; 25. Cleaning roll; 251. Scraper; 26. First fixing frame; 261. First knife net; 27. Second fixing frame; 271. Second knife net; 3. Die pad; 4. Motor. Specific embodiments

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Example, refer to Figures 1-6 , a structure of an extrusion coating head for producing a silicone film, including an upper die head 1 and a lower die head 2 arranged below the upper die head 1, and an upper die lip 11 is installed at one end of the upper die head 1; A lower die lip 21 is installed at one end of the lower die head 2, a die pad 3 is installed between the lower die head 2 and the upper die head 1, a feed inlet 22 is opened at one end of the lower die head 2, a feed chamber 23 is opened at one end of the feed inlet 22, an arc groove 231 is opened on one side of the feed chamber 23, a cleaning roll 25 is installed on one side of the arc groove 231, and a motor 4 is installed on the outer wall of one side of the lower die head 2.

[0020] Further, the upper die head 1 and the lower die head 2 are fixed by bolts and nuts, the die cushion 3 seals between the die heads, the arc-shaped groove 231 is opened at the corner position close to the feeding cavity 23, both side walls at the two ends of the cleaning roller 25 are rotatably connected to the inner wall of the feeding cavity 23, a plurality of scraping blades 251 are installed on the surface of the cleaning roller 25, the output end of the motor 4 is fixedly connected to one end of the cleaning roller 25, a flow guide cover 24 is fixedly connected to the inner wall of the feeding cavity 23 on the side close to the cleaning roller 25, the flow guide cover 24 is an arc-shaped plate, a flow guide groove 232 is opened at one end of the feeding cavity 23 close to the arc-shaped groove 231, one end of the flow guide groove 232 faces the flow guide cover 24, one end of the flow guide cover 24 is fixedly connected to a flow guide plate 241, a first fixing frame 26 and a second fixing frame 27 are respectively fixedly connected to the outer wall on the side of the flow guide plate 241 close to the lower die head 2, a first knife net 261 is fixedly connected to the inner wall of the first fixing frame 26, a second knife net 271 is fixedly connected to the inner wall of the second fixing frame 27, both the first knife net 261 and the second knife net 271 are composed of a plurality of blades arranged vertically and alternately, and the gap between the blades in the first knife net 261 is larger than the gap in the second knife net 271.

[0021] It should be noted that: Select a die pad 3 with an appropriate height according to the extrusion thickness for installation. Then, connect and fix the upper die head 1 and the lower die head 2 with bolts and nuts. One end of the feed port 22 is connected to a fluid pipeline. During coating, the fluid is filled into the feed cavity 23 through the feed port 22 and flows out through one side of the die lip during the extrusion process under pressure. During this process, the fluid near the corner can make a smooth transition under the action of the arc-shaped groove 231, avoiding the sudden drop in the fluid velocity at the corner and forming a low-velocity stagnant area. At the same time, the cleaning roller 25 arranged on one side of the arc-shaped groove 231 is driven by a motor 4 during operation, controlling the outer scraper 251 to rotate continuously to scrape the fluid adhering to the arc-shaped groove 231, preventing the fluid from accumulating and solidifying on the arc, thus ensuring the fluid flow velocity. At the same time, the flow guide cover 24 arranged on one side of the cleaning roller 25 has its inner side wall closely attached to the scraper 251. The fluid enters through the opening between the flow guide cover 24 and the arc-shaped groove 231, and the rotation of the scraper 251 drives the fluid to move in a certain direction, making it flow out through the upper side wall of the cleaning roller 25. The flow guide cover 24 guides and pushes the fluid at the corner, accelerating the fluid flow velocity at the corner, avoiding long-term accumulation due to too low a flow rate, and thus improving the fluid discharge speed. The flow guide groove 232 arranged at one end of the arc-shaped groove 231 has the arc surface at one end facing the inside of the flow guide cover 24, and the fluid can be guided to quickly enter between the scraper 251 and the flow guide cover 24 when flowing along the inner wall, further increasing the fluid flow velocity and helping to better perform extrusion coating subsequently. When the fluid passes through the outer side wall of the flow guide cover 24, under the action of its arc surface, the fluid is divided into two parts for flow. The fluid near the upper side moves along its side wall towards the die lip for extrusion coating, while the fluid near the lower side moves along its side wall towards one side of the flow guide groove 232, mixes with the fluid flowing on the inner side wall of the flow guide groove 232 and then enters the inside of the flow guide cover 24, and then moves from the upper side to one side of the die lip through the rotation of the scraper 251, thereby further guiding the fluid flow direction, avoiding the formation of flow dead zones and causing accumulation and solidification, and thus preventing the fluid from being blocked and affecting the coating effect; At the same time, a horizontal flow guide plate 241 is installed on one side of the flow guide cover 24, which can further guide the fluid flow direction. Two knife meshes are arranged at the outlet. When some fluid solidifies and is scraped off by the scraper 251 and guided to the knife mesh along with the fluid, during the process of passing through the knife mesh, the solidified particles are cut by several blades. The gaps in the two knife meshes are different, enabling secondary cutting to cut the solidified particles into smaller particles and re-incorporate them into the fluid for subsequent coating, saving costs and avoiding the solidified waste from affecting the subsequent coating quality.

[0022] Further, an installation groove 12 is formed on one side of the upper die head 1. The installation groove 12 is composed of a semi-circular shape and an arc shape. A diversion roller 13 is rotatably connected to the inner wall of the installation groove 12, and a plurality of blades 14 are fixedly connected to the side wall of the diversion roller 13.

[0023] It should be noted that the diversion roller 13 is arranged in the installation groove 12 formed on the upper die head 1. When the fluid flowing above the diversion plate 241 acts on the blades 14, it will drive the diversion roller 13 to rotate. When the blades 14 rotate, they push the surrounding fluid to accelerate the flow, increase the speed of the fluid in the surrounding area, enhance the overall fluidity, reduce the layering and non-uniformity caused by the flow rate difference, provide a stable and uniform fluid supply for the subsequent coating, and at the same time, when the blades 14 rotate, the components in the fluid can be more evenly mixed and dispersed, avoiding the phenomenon of too high or too low local component concentration, and further ensuring the subsequent coating quality.

[0024] The working principle of the extrusion coating head structure for producing a silicone film: Select a die pad 3 with an appropriate height for installation according to the extrusion thickness. Then, connect and fix the upper die head 1 and the lower die head 2 with bolts and nuts. One end of the feed port 22 is connected to a fluid pipeline. During coating, the fluid is filled into the feed cavity 23 through the feed port 22 and flows out through one side of the die lip during the extrusion process under pressure. During this process, the fluid near the corner can make a smooth transition under the action of the arc-shaped groove 231, avoiding the sudden drop in the fluid velocity caused by the corner and forming a low-velocity stagnant area. At the same time, the cleaning roller 25 arranged on one side of the arc-shaped groove 231 is driven by a motor 4 during operation, controlling the outer scraper 251 to continuously rotate to scrape the fluid adhering in the arc-shaped groove 231, avoiding the accumulation and curing of the fluid on the arc, thereby ensuring the fluid flow velocity. At the same time, the guide cover 24 arranged on one side of the cleaning roller 25 has its inner side wall closely attached to the scraper 251. The fluid enters through the opening between the guide cover 24 and the arc-shaped groove 231, and the rotation of the scraper 251 drives the fluid to move in a certain direction, enabling it to flow out through the upper side wall of the cleaning roller 25. The guide cover 24 guides and pushes the fluid at the corner, accelerating the fluid flow velocity at the corner, avoiding long-term accumulation due to too low a flow rate, thereby improving the fluid discharge speed. The diversion groove 232 arranged at one end of the arc-shaped groove 231 has the arc surface at one end facing the inside of the guide cover 24. When the fluid flows along the inner wall, it can be guided to quickly enter between the scraper 251 and the guide cover 24, further increasing the fluid flow velocity and helping to better perform extrusion coating subsequently. When the fluid passes through the outer side wall of the guide cover 24, under the action of its arc surface, the fluid is divided into two parts for flow. Among them, the fluid near the upper side moves along its side wall towards the die lip for extrusion coating. At the same time, the fluid near the lower side moves along its side wall towards one side of the diversion groove 232 and mixes with the fluid flowing on the inner side wall of the diversion groove 232 and then enters the inside of the guide cover 24, and then moves from the upper side to one side of the die lip through the rotation of the scraper 251, thereby further guiding the fluid flow direction, avoiding the formation of a flow dead zone resulting in accumulation and curing, and thus avoiding fluid blockage affecting the coating effect.

[0025] It should be noted that the specific model and specification of the motor need to be selected and determined according to the actual specifications of the device, etc. The specific selection calculation method adopts the existing technology in this field, so it will not be elaborated in detail.

[0026] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A silicone film production extrusion coating head structure, comprising an upper die head (1) and a lower die head (2) arranged below the upper die head (1), characterized in that: An upper die lip (11) is installed at one end of the upper die head (1); A lower die lip (21) is installed at one end of the lower die head (2), a die pad (3) is installed between the lower die head (2) and the upper die head (1), a feed port (22) is provided at one end of the lower die head (2), a feed cavity (23) is provided at one end of the feed port (22), an arc-shaped groove (231) is provided on one side of the feed cavity (23), a cleaning roller (25) is installed on one side of the arc-shaped groove (231), and a motor (4) is installed on one side of the outer wall of the lower die head (2).

2. A silicone film production extrusion coating head structure according to claim 1, characterized in that: The upper die head (1) and the lower die head (2) are fixed by bolts and nuts, and the die pad (3) seals the die heads.

3. A silicone film production extrusion coating head structure according to claim 2, characterized in that: The arc groove (231) is provided at a corner position close to the feed chamber (23); the side walls at both ends of the cleaning roller (25) are rotatably connected to the inner wall of the feed chamber (23); a plurality of scrapers (251) are mounted on the surface of the cleaning roller (25); and the output end of the motor (4) is fixedly connected to one end of the cleaning roller (25).

4. A silicone film production extrusion coating head structure according to claim 3, characterized in that: A flow guide cover (24) is fixedly connected to the inner wall of the feed chamber (23) on the side close to the cleaning roller (25); the flow guide cover (24) is an arc-shaped plate; a flow guide groove (232) is provided at one end of the feed chamber (23) close to the arc-shaped groove (231); one end of the flow guide groove (232) faces the flow guide cover (24).

5. The silicone film production extrusion coating head structure according to claim 4, characterized in that: One end of the guide cover (24) is fixedly connected to a guide plate (241), and an outer wall of the guide plate (241) on one side close to the lower die head (2) is respectively fixedly connected to a first fixing frame (26) and a second fixing frame (27).

6. The silicone film production extrusion coating head structure according to claim 5, characterized in that: The inner wall of the first fixed frame (26) is fixedly connected to a first knife net (261), and the inner wall of the second fixed frame (27) is fixedly connected to a second knife net (271). Both the first knife net (261) and the second knife net (271) are composed of a plurality of blades arranged vertically and staggered, and the gaps between the blades in the first knife net (261) are larger than the gaps in the second knife net (271).

7. The silicone film production extrusion coating head structure according to claim 1, characterized in that: A mounting groove (12) is provided on one side of the upper die head (1), the mounting groove (12) being composed of a semicircle and an arc, the inner wall of the mounting groove (12) being rotatably connected to a guide roller (13), and the side wall of the guide roller (13) being fixedly connected to a plurality of blades (14).

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