Eva film speed casting machine

Abstract

The application discloses an EVA adhesive film speed-increasing casting machine, which comprises a rack, and the rotating axis center lines of a cooling steel roller one and a cooling steel roller two on the rack are located on a horizontal plane, the rotating axis center lines of a cooling steel roller three and a cooling rubber roller are located on an inclined plane, the inclination angle of the inclined plane is 40-50 degrees, the steel roller inner cylinder and the steel roller outer cylinder of the cooling steel roller one, the cooling steel roller two and the cooling steel roller three are spaced and sleeved to form a steel roller cooling water cavity, the steel roller inner cylinder spiral blade and the steel roller outer cylinder spiral blade are alternately arranged in the steel roller cooling water cavity, the rubber roller inner cylinder and the rubber roller outer cylinder of the cooling rubber roller are spaced and sleeved to form a rubber roller cooling water cavity, the rubber roller inner cylinder spiral blade and the rubber roller outer cylinder spiral blade are arranged in the rubber roller cooling water cavity, and the rubber roller outer cylinder outer wall is coated with a rubber roller rubber coating layer. The film casting machine can effectively control the thickness uniformity of the extruded film and the definition of the film surface embossing, and effectively improve the operation efficiency of the casting machine.

Description

Technical Field

[0001] This invention relates to equipment for producing encapsulation films for solar photovoltaic cells, and more particularly to casting equipment for EVA encapsulation films on silicon wafers for solar photovoltaic cells. Background Technology

[0002] In solar photovoltaic modules, the role of photovoltaic EVA encapsulation film is to bond the silicon wafers of photovoltaic glass cells and the backsheet together, while also protecting the cells and isolating them from air. The quality of the EVA film not only affects the light transmittance and power quality of the cell elements, but also the bonding strength and adhesion between the EVA film and the tempered glass and the substrate directly affect the power generation efficiency and lifespan of the photovoltaic cells.

[0003] The uniformity of EVA film thickness and the uniformity of surface embossing are two extremely important indicators for evaluating the quality of film products. Uneven film thickness not only affects the tensile strength and barrier properties of the film at various points, but also leads to permanent deformations such as cracking and wrinkling on the film surface. Such uneven EVA encapsulation films, with cracks and wrinkles, severely impact the power generation efficiency of photovoltaic cells. The uniformity of the surface embossing of the EVA encapsulation film directly affects whether air can be completely expelled when the EVA film is bonded to the solar cell, thus affecting the film's adhesion and uniformity. Therefore, EVA films not only require uniform thickness, but also require uniform and clear surface embossing.

[0004] The applicant filed and was granted a patent on July 12, 2021, for a "High-Precision Temperature-Controlled Film Casting Machine" (patent number: 202110783485.6). In this invention, the extruded film from the film extrusion die first enters a pair of rubber rollers and steel patterned rollers, and then passes through a grinding roller and a cooling roller to complete the EVA film casting. Since the steel patterned rollers cannot produce clear and uniform embossing on the film surface, this invention initially uses a pair of rubber rollers and steel patterned rollers to achieve film embossing. However, because the molten film just exiting the extrusion die has a relatively high temperature, and the rubber rollers have poor thermal conductivity, it is difficult to quickly cool the extruded film. This easily leads to sticking and wrapping on the rubber rollers, making it difficult to control the thickness uniformity of the extruded film. Furthermore, the embossing is not easily set at relatively high temperatures, resulting in uneven and unclear film surface embossing. Therefore, the rotation speed of the rubber rollers and steel patterned rollers must be reduced to ensure the quality of the film extrusion, thus limiting the production efficiency of the casting machine. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an EVA film speed-up casting machine that can not only effectively control the uniformity of the extruded film thickness and the clarity of the film surface embossing, but also effectively improve the operating efficiency of the casting machine.

[0006] To solve the above-mentioned technical problems, the present invention provides an EVA film speed-up casting machine, comprising a frame on which cooling steel roller one, cooling steel roller two, cooling steel roller three, cooling rubber roller, and guide cooling roller are rotatably supported sequentially along the casting path. Cooling steel roller one and cooling steel roller two constitute a cooling calendering roller pair, and cooling steel roller three and cooling rubber roller three constitute another cooling calendering roller pair. The rotation axes of cooling steel roller one and cooling steel roller two are located on a horizontal plane, while the rotation axes of cooling steel roller three and cooling rubber roller three are located on an inclined plane with an inclination angle α = 40°–50°. The inner and outer cylinders of the cooling steel rollers 1, 2, and 3 are fitted together at intervals to form a cooling water chamber. Spiral blades of the inner and outer cylinders are alternately arranged in the cooling water chamber. The inner and outer cylinders of the cooling rubber roller are fitted together at intervals to form a cooling water chamber. Spiral blades of the inner and outer cylinders are arranged in the cooling water chamber. A rubber coating layer is applied to the outer cylinder wall. The frame is supported on a traveling mechanism via a lifting mechanism, which is movably supported on a moving track.

[0007] In the above structure, the molten film cast from the extrusion die first passes through a cooling calendering pair consisting of cooling steel roller one and cooling steel roller two, and then through another cooling calendering pair consisting of cooling steel roller three and cooling rubber roller. The steel roller calendering pair consisting of cooling steel roller one and cooling steel roller two has good thermal conductivity, which can not only cool and shape the molten cast film, but also effectively control the shaped film thickness, ensuring uniform film thickness and avoiding wrinkles and bursting of the molten cast film. Cooling steel roller three and cooling rubber roller then perform pattern pressing and final shaping on the calendered film that has been initially cooled and shaped and maintained at the film temperature. This structure of cooling and shaping first, and then embossing, can not only greatly improve the operating efficiency of the casting machine and increase the rotation speed of the casting rollers, but also produce uniform film thickness and clear embossing. Furthermore, since the rotation axes of the cooling steel roller three and the cooling rubber roller are located on an inclined plane with an angle of 40°–50°, the cooling rubber roller presses against the cooling steel roller three under gravity, effectively overcoming fluctuations in the rolling pressure and making the rolling pressure more stable. This results in clearer and more uniform embossed patterns. Simultaneously, the addition of cylinder pressure ensures stable pressure and easy control, stabilizing film thickness and guaranteeing embossing quality. Moreover, the alternating inner and outer spiral blades within the cooling water chambers of the cooling steel rollers one, two, three, and the cooling rubber roller significantly extend the heat exchange path, increase the heat exchange contact area, and improve heat exchange efficiency. This greatly enhances the heat exchange efficiency of the casting roller, enabling rapid cooling and shaping of the molten extruded film and ensuring a substantial increase in the operating efficiency of the casting machine. Because the casting machine frame is supported on the traveling mechanism by the lifting mechanism, this structure can adjust the height of the casting machine. The distance between the extrusion die and the casting roller pair can be adjusted according to the thickness of the molten film, and the length of the air cooling path of the molten film can be adjusted. With the help of the traveling mechanism, the entire casting machine can be moved out of the working position for the replacement and maintenance of the extrusion die and casting roller.

[0008] In a further embodiment of the present invention, the first cooling steel roller is rotatably supported on a steel roller support, which is slidably supported on a steel roller support slide rail, which is fixedly mounted on the frame. The second cooling steel roller is rotatably supported on a second steel roller support, which is fixedly mounted on the frame. A steel roller pressing cylinder is fixedly mounted on the frame, and the steel roller pressing cylinder contacts the first steel roller support. A roller gap adjuster and a roller gap calibrator are installed between the first and second steel roller supports. This allows for accurate control of the rolling pressure between the casting rollers and accurate adjustment and control of the casting film thickness and uniformity between the two casting steel rollers.

[0009] In a preferred embodiment of the present invention, the spiral blades of the inner and outer cylinders of the steel roller are spiral blades with the same direction of rotation and pitch; the spiral blades of the inner cylinder are fixedly installed on the outer wall of the inner cylinder; the spiral blades of the outer cylinder are fixedly installed on the inner wall of the outer cylinder. Both the inner and outer cylinder spiral blades are corrugated blades; the inner cylinder spiral blades are spaced apart from the inner cylinder of the outer cylinder, and the outer cylinder spiral blades are spaced apart from the outer wall of the inner cylinder. The corrugated surface of the spiral blades causes the water flow in the spiral channel to form circumferential pulsations and turbulence, disrupting laminar flow and enhancing the heat exchange capacity of the casting roller; the end gaps of the spiral blades cause the water flow to form tortuous flow lines in the radial direction, strengthening heat exchange between different layers of water flow and disrupting radial laminar flow. This structure of corrugated surface with end gaps greatly improves the heat exchange efficiency of the casting roller.

[0010] In a further embodiment of the present invention, the cooling rubber roller is rotatably supported on a rubber roller support, which is slidably supported on a rubber roller seat slide rail, which is fixedly mounted on the frame; the cooling steel roller is rotatably supported on a steel roller support, which is fixedly mounted on the frame. A rubber roller pressing cylinder is fixedly mounted on the frame, and the rubber roller pressing cylinder contacts the rubber roller support; a roller gap adjuster and a roller gap calibrator are installed between the rubber roller support and the steel roller support. This not only accurately controls the rolling pressure of the casting rollers, but also accurately adjusts and controls the thickness and uniformity of the cast film between the two casting steel roller pairs.

[0011] In a preferred embodiment of the present invention, the spiral blades of the inner and outer cylinders of the rubber roller are spiral blades with the same direction of rotation and pitch; the spiral blades of the inner cylinder are fixedly installed on the outer wall of the inner cylinder; the spiral blades of the outer cylinder are fixedly installed on the inner wall of the outer cylinder. Both the inner and outer cylinder spiral blades are corrugated blades; the spiral blades of the inner cylinder are spaced apart from the inner wall of the outer cylinder, and the spiral blades of the outer cylinder are spaced apart from the outer wall of the inner cylinder. The corrugated surface of the spiral blades causes the water flow in the spiral channel to form circumferential pulsations and turbulence, disrupting laminar flow and enhancing the heat exchange capacity of the casting roller; the end gaps of the spiral blades cause the water flow to form tortuous flow lines in the radial direction, strengthening heat exchange between different layers of water flow and disrupting radial laminar flow. This structure of corrugated surface with superimposed end gaps greatly improves the heat exchange efficiency of the casting roller.

[0012] In a preferred embodiment of the present invention, the rubber coating layer covering the outer cylinder of the rubber roller is formed by coating a thermally conductive silicone composition, wherein the thermally conductive silicone composition comprises, by weight percentage: 94%-96% thermally conductive silicone and 4%-6% metal microspheres. The metal microspheres are at least one of copper, silver, and aluminum, with a particle size of 1-3 mm; the thickness of the rubber coating layer is L = 3-5 mm. This coating layer not only forms good high-performance elasticity, ensuring uniform and clear embossing on the film surface, but also rapidly dissipates heat thanks to the high thermal conductivity of the metal microspheres, achieving the dual effect of high elasticity and high thermal conductivity. Attached Figure Description

[0013] The EVA film speed-up casting machine of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a three-dimensional structural view of a specific embodiment of the EVA film speed-up casting machine of the present invention;

[0015] Figure 2 yes Figure 1 The front view;

[0016] Figure 3 yes Figure 1 The illustrated embodiment is a three-dimensional structural view of the dismantled lifting mechanism and traveling mechanism;

[0017] Figure 4 yes Figure 3 The front view;

[0018] Figure 5 yes Figure 1 The schematic diagram of the roller gap adjuster in the embodiment shown is as follows;

[0019] Figure 6 yes Figure 5 The left view;

[0020] Figure 7 yes Figure 1 A three-dimensional structural diagram of the lifting mechanism in the embodiment shown;

[0021] Figure 8 yes Figure 7 The front view;

[0022] Figure 9 yes Figure 1 A schematic diagram of the walking mechanism in the embodiment shown;

[0023] Figure 10 yes Figure 9 Top view;

[0024] Figure 11 yes Figure 1A schematic cross-sectional view of the cooling steel roller in the embodiment shown.

[0025] Figure 12 yes Figure 11 Enlarged structural diagram of Part I;

[0026] Figure 13 yes Figure 11 A schematic diagram of the structure of the spiral blades of the inner cylinder of the steel roll or the spiral blades of the outer cylinder of the steel roll;

[0027] Figure 14 yes Figure 1 A schematic cross-sectional view of the cooling roller in the embodiment shown.

[0028] Figure 15 yes Figure 14 Enlarged structural diagram of section II;

[0029] Figure 16 yes Figure 14 A schematic diagram of the structure of the spiral blades of the inner cylinder of the rubber roller or the spiral blades of the outer cylinder of the rubber roller.

[0030] In the diagram, 1—moving track, 2—frame, 3—traveling mechanism, 4—lifting mechanism, 5—guide cooling roller, 7—cooling steel roller two, 8—cooling steel roller one, 9—heating lamp, 10—cooling steel roller three, 11—rubber roller pressing cylinder, 12—rubber roller seat slide rail, 13—rubber roller support, 14—roller gap calibrator, 15—roller gap adjuster, 16—steel roller three support, 17—steel roller two support, 18—steel roller one support, 19—steel roller pressing cylinder, 20—steel roller seat slide rail, 21—support body; 151—adjusting handle, 152—adjusting reducer, 153—adjusting top rod, 154—guide key; 401—lifting top rod, 402—lifting gearbox, 403—lifting coupling, 404—lifting shaft, 405—lifting motor; 301—traveling wheel, 302—traveling gearbox, 303—... —Travel motor; 304—Travel wheel frame; 305—Travel coupling; 306—Travel wheel axle; 801—Inner cylinder of steel roller; 802—Steel roller inner cylinder helical blade; 803—Steel roller outer cylinder helical blade; 804—Steel roller outer cylinder; 805—Steel roller cooling water cavity; 806—Steel roller end cover water hole; 807—Steel roller end cover; 808—Steel roller end shaft; 809—Steel roller bearing; 810—Steel roller end shaft Water hole; 811—steel roller rib; 601—inner cylinder of rubber roller; 602—helical blade of inner cylinder of rubber roller; 603—helical blade of outer cylinder of rubber roller; 604—outer cylinder of rubber roller; 605—cooling water cavity of rubber roller; 606—water hole of end cover of rubber roller; 607—end cover of rubber roller; 608—end shaft of rubber roller; 609—bearing of rubber roller; 610—water hole of end shaft of rubber roller; 611—rubber coating layer of rubber roller; 612—rib of rubber roller. Detailed Implementation

[0031] like Figure 1, Figure 2 , Figure 3 and Figure 4 The EVA film speed-increasing casting machine shown has a frame structure 2, which includes two side panels. These side panels are fixedly connected by connecting struts to form a frame frame. Lifting mechanisms 4 are supported at the bottom of both ends of the side panels of the frame 2. The lifting mechanisms 4 are mounted on corresponding traveling mechanisms 3 at their bottom ends. The traveling mechanisms 3 are supported by their traveling wheels 301 on corresponding moving tracks 1, which are I-beam steel sections. The lifting mechanisms 4, through their lifting motors 405, can vertically raise or lower the frame 2; the traveling mechanisms 3 can move the frame 2 back and forth along the moving tracks 1 via the lifting mechanisms 4.

[0032] Cooling steel roller 8, cooling steel roller 7, cooling steel roller 3, and guide cooling roller 5 are rotatably supported on frame 2. These rollers are arranged sequentially from front to back along the casting path of the cast film. Cooling steel rollers 8, 7, and 3 are rotatably supported on the top of the side plates on both sides of frame 2 via corresponding rotating supports at their ends. Guide cooling roller 5 is rotatably supported on the side plates on both sides of frame 2 at both ends. The five-roll casting machine consists of cooling steel rollers 8, 7, 3, 6, and 5. Cooling water inlet and outlet pipes are connected to the ends of cooling rollers 8, 7, 3, 6, and 5 to allow cooling water to be introduced into the rollers and carry away the molten heat of the cast film.

[0033] The two ends of cooling steel roller 8 are rotatably supported on corresponding steel roller supports 18. The bottoms of the two steel roller supports 18 are supported on steel roller seat slide rails 20. The steel roller seat slide rails 20 are standard linear sliding guide rails and are fixedly installed on the top of the corresponding side plate of the frame 2. The two ends of cooling steel roller 7 are rotatably supported on corresponding steel roller supports 17. The two steel roller supports 17 are fixedly installed on the top of the corresponding side plate of the frame 2. Cooling steel roller 8 and cooling steel roller 7 roll against each other to form a cooling calendering roller pair. The casting extrusion die is located at the common tangent of cooling steel roller 8 and cooling steel roller 7, and is located above the corresponding two rollers. The rotation axes of cooling steel roller 8 and cooling steel roller 7 are located on a horizontal plane.

[0034] Steel roller pressing cylinders 19 are installed on the top of the front side plates of both sides of the frame 2. The cylinder body of the steel roller pressing cylinder 19 is hinged on the corresponding hinge support, which is fixedly installed on the side plate of the frame 2. The piston rods of the two steel roller pressing cylinders 19 respectively touch the corresponding steel roller support 18. A heating lamp 9 is also installed at the top of the steel roller support 18. The heating lamp 9 is an infrared heating lamp located on the side of the material film in the extrusion path.

[0035] A roller gap adjuster 15 and a roller gap calibrator 14 are also installed between the first roller support 18 and the second roller support 17. By cranking the handle of the roller gap adjuster 15, the casting gap between the first cooling steel roller 8 and the second cooling steel roller 7 can be adjusted to regulate different casting film thicknesses. The roller gap calibrator 14 mainly includes a dial indicator for measuring the gap between the cooling steel rollers. The dial indicator base is fixedly installed on the first roller support 18, and the dial indicator head will contact the second roller support 17.

[0036] The two ends of the cooling steel roller 3 10 are rotatably supported on corresponding steel roller supports 16. Both steel roller supports 16 are fixedly installed on the top of the corresponding side plates of the frame 2. The two ends of the cooling rubber roller 6 are rotatably supported on corresponding rubber roller supports 13. The bottom of the rubber roller supports 13 is supported on the rubber roller seat slide rail 12. The rubber roller seat slide rail 12 is a linear sliding guide rail and is fixedly installed on the top of the corresponding side plate of the frame 2. The cooling steel roller 3 10 and the cooling rubber roller 6 roll against each other to form another cooling calendering roller pair. The axis of rotation of the cooling steel roller 3 10 and the cooling rubber roller 6 is located on an inclined plane relative to the horizontal plane. The inclination angle α of this inclined plane is 45°, preferably between 40° and 50°.

[0037] Roller pressing cylinders 11 are installed on the top of the rear side plates of both sides of the frame 2. The cylinder body of the roller pressing cylinder 11 is hinged on the corresponding hinge support, which is fixedly installed on the side plate of the frame 2. The piston rods of the two roller pressing cylinders 11 are respectively abutted on the roller support 13 on the corresponding side. The pressing direction of the piston rod of the roller pressing cylinder 11 is also located on the inclined surface where the rotation axis of the cooling steel roller 3 10 and the cooling roller 6 are located. The cooling roller 6 is pressed against the cooling steel roller 3 10 under the action of its gravity component and the cylinder force to avoid fluctuation of the rolling pressure and maintain the pressing quality of the film embossing.

[0038] A roller gap adjuster 15 and a roller gap calibrator 14 are also installed between the cooling steel roller 3 10 and the cooling rubber roller 6. The roller gap adjuster 15 and roller gap calibrator 14 here have the same structure as the roller gap adjuster 15 and roller gap calibrator 14 between the cooling steel roller 1 8 and the cooling steel roller 2 7. The roller gap adjuster 15 here is fixedly installed on the top of the corresponding side plate of the frame 2 by a bracket 21. The roller gap calibrator 14 also includes a dial indicator for measuring the distance between the cooling steel roller 3 10 and the cooling rubber roller 6. The dial indicator base is fixedly installed on the bracket 21, and the dial indicator head abuts against the rubber roller support 13.

[0039] like Figure 5 , Figure 6The roller gap adjuster shown includes an adjusting reducer 152, which is a worm gear reducer. An adjusting handle 151 is fixedly mounted on the extended end of the worm. The worm gear is rotatably supported on a worm gear base. An adjusting rod 153 is mounted at the worm gear's axis via a threaded screw pair. The adjusting rod 152 is slidably supported on the worm gear base via a guide key 154. Rotating the worm gear by the adjusting handle 151 drives the worm gear to rotate, which in turn drives the adjusting rod 153 via the threaded pair, thereby adjusting the gap between the two pairs of rollers.

[0040] like Figure 7 , Figure 8 The lifting mechanism shown includes a lifting shaft 404. Both ends of the lifting shaft 404 are connected to a lifting gearbox 402 via a lifting coupling 403. The lifting gearbox 402 is also a worm gear reducer. The lifting coupling 403 is a flange coupling. The lifting rod 401 is telescopically slidably supported on the lifting gearbox 402. A lifting motor 405 for driving the lifting gearbox 402 is installed on the lifting gearbox 402 at one end of the lifting shaft 404. The lifting gearbox 402 includes a worm gear transmission pair and a threaded transmission pair.

[0041] like Figure 9 , Figure 10 The walking mechanism shown includes a walking wheel axle 306. Walking wheels 301 are connected to both ends of the walking wheel axle 306 via walking couplings 305. The walking wheels 301 are rotatably supported on the walking wheel frame 304. A walking gearbox 302 is installed on one side of the walking wheel frame 304. The walking motor 303 drives the walking gearbox 302. The walking gearbox 302 also adopts a worm gear reducer.

[0042] The roller gap adjuster 15, lifting gearbox 402 and travel gearbox 302 mentioned above all use commercially available dedicated drive devices, such as products from Shanghai Yaxiong Reduction Machinery Co., Ltd.

[0043] like Figure 11 , Figure 12 and Figure 13The cooling steel roller structure is shown. In this embodiment, cooling steel roller 1 (8), cooling steel roller 2 (7), cooling steel roller 3 (10), and guide cooling roller 5 adopt the same structural type, but the outer diameter of the guide cooling roller 5 is smaller than that of cooling steel roller 1 (8), cooling steel roller 2 (7), and cooling steel roller 3 (10). Cooling steel roller 1 (8), cooling steel roller 2 (7), cooling steel roller 3 (10), and guide cooling roller 5 all include a corresponding inner steel roller cylinder 801 and an outer steel roller cylinder 804. The outer steel roller cylinder 804 is fitted around the inner steel roller cylinder 801 at intervals. Both the outer steel roller cylinder 804 and the inner steel roller cylinder 801 are carbon steel cylinders, and the outer wall of the outer steel roller cylinder 804 is provided with a cylinder wall embossing pattern. Steel roller end caps 807 are fixedly welded to both ends of the inner cylinder 801 and the outer cylinder 804 of the steel roller. The inner cylinder 801, the outer cylinder 804, and the steel roller end caps 807 at both ends form a steel roller cooling water chamber 805. Extending steel roller end shafts 808 are fixedly installed on the steel roller end caps 807 at both ends. The steel roller end shafts 808 at both ends are located on the axis of the outer cylinder 804. Two steel roller ribs 811 are fixedly installed on the inner wall of the inner cylinder 801. The steel roller end shafts can also be a through-shaft structure.

[0044] Several evenly distributed water holes 806 are provided radially on the end caps 807 at both ends of the steel roller. Water holes 810 are also provided at the axial center of the end shafts 808 at both ends of the steel roller. Steel roller bearings 809 are installed on both end shafts 808, and the end shafts 808 are rotatably mounted on the corresponding steel roller supports via the bearings 809. Cooling water flows from the water holes 810 on one end of the end shaft 808 through the water holes 806 on the corresponding end of the end cap 807 into the cooling water chamber 805. The cooling water in the cooling water chamber 805 then flows out through the water holes 806 on the other end cap 807 and the water holes 810 on the other end shaft.

[0045] In the cooling water cavity 805 of the steel roller, spiral blades 802 and spiral blades 803 of the inner and outer cylinders are alternately arranged, with the same direction of rotation and pitch. The spiral blades 802 of the inner cylinder are fixedly installed on the outer wall of the inner cylinder 801, and a spiral blade end gap b is maintained between the spiral blades 802 and the inner wall of the outer cylinder 804. The spiral blades 803 of the outer cylinder are fixedly installed on the inner wall of the outer cylinder 804, and a spiral blade end gap b is also maintained between the spiral blades 803 and the outer wall of the inner cylinder 801. The cooling water cavity height of the steel roller cooling water cavity 805 is B, and the spiral blade end gap b is 1 / 3 of the cooling water cavity height B, i.e., b = 1 / 3B. Preferably, b = (1 / 4 - 1 / 2)B, which allows for the formation of circumferential and radial undulating water flow. Both the inner cylinder spiral blade 802 and the outer cylinder spiral blade 803 of the steel roller are corrugated thread blades. This structure can intensify the fluctuation of cooling water flow and form strong turbulence, which greatly improves the heat transfer efficiency.

[0046] like Figure 14 , Figure 15 and Figure 16 The cooling roller shown includes an inner roller cylinder 601 and an outer roller cylinder 604. The outer roller cylinder 604 is fitted around the inner roller cylinder 601 at intervals. Both the outer roller cylinder 604 and the inner roller cylinder 601 are carbon steel cylinders. Embossed patterns are provided on the outer wall of the outer roller cylinder 604. Corresponding roller end caps 607 are fixedly welded to both ends of the inner roller cylinder 601 and the outer roller cylinder 604. The inner roller cylinder 601, the outer roller cylinder 604, and the roller end caps 607 at both ends form a roller cooling water cavity 605. Extending roller end shafts 608 are fixedly installed on the roller end caps 607 at both ends. The roller end shafts 608 at both ends are located on the axis of the outer roller cylinder 604. Two roller ribs 612 are fixedly provided on the inner wall of the inner roller cylinder 601. The roller end shafts can also be a through-shaft structure.

[0047] Several evenly distributed water holes 606 are provided radially on the end caps 607 at both ends of the rubber roller. Water holes 610 are also provided at the axial center of the end shafts 608 at both ends of the rubber roller. Rubber roller bearings 609 are installed on both end shafts 608, and the end shafts 608 are rotatably mounted on the corresponding rubber roller supports via the bearings 609. Cooling water flows from the water hole 610 on one end of the end shaft 608 through the water holes 606 on the corresponding end cap 607 into the rubber roller cooling water chamber 605. The cooling water in the cooling water chamber 605 then flows out through the water holes 606 and 610 on the other end cap 607.

[0048] The rubber roller cooling water cavity 605 is also provided with alternating inner cylinder spiral blades 602 and outer cylinder spiral blades 603, which have the same direction of rotation and pitch. The inner cylinder spiral blades 602 are fixedly installed on the outer cylinder wall of the inner cylinder 601, and a spiral blade end gap b is maintained between the inner cylinder spiral blades 602 and the inner cylinder wall of the outer cylinder 604. The outer cylinder spiral blades 603 are fixedly installed on the inner cylinder wall of the outer cylinder 604, and a spiral blade end gap b is also maintained between the outer cylinder spiral blades 603 and the outer cylinder wall of the inner cylinder 601. The cooling water cavity height of the rubber roller cooling water cavity 605 is B, and the spiral blade end gap b is 1 / 3 of the cooling water cavity height B, i.e., b = 1 / 3B. Preferably, b = (1 / 4 - 1 / 2)B, which can form circumferential and radial undulating water flow. Both the inner cylinder spiral blade 602 and the outer cylinder spiral blade 603 of the rubber roller are corrugated thread blades. This structure can intensify the fluctuation of cooling water flow and form strong turbulence, which greatly improves the heat transfer efficiency.

[0049] Unlike the cooling steel roller structure, the outer cylinder 604 of the rubber roller is covered with a rubber coating layer 611. This rubber coating layer 611 is coated with a thermally conductive silicone composition, which includes thermally conductive silicone and metal microspheres. The thermally conductive silicone accounts for 95% by weight, and the metal microspheres account for 5% by weight. Preferably, the thermally conductive silicone weight percentage is controlled between 94% and 96%, and the metal microspheres weight percentage is 4% to 6%. The particle size of the metal microspheres should be controlled between 1 mm and 3 mm. The metal microspheres are preferably pure copper, but can also be silver or aluminum, or a mixture of two or three types of microspheres; even diamond microspheres can be used to achieve better thermal conductivity. The thickness L of the rubber coating layer 611 is 5 mm, preferably controlled between 4 mm and 6 mm, to maintain suitable elasticity. Adding a certain amount of metal microspheres to thermally conductive silicone greatly enhances its thermal conductivity, giving it good elasticity and thermal conductivity.

Claims

1. An EVA film speed-increasing casting machine, comprising a frame (2), characterized in that: The frame (2) is supported sequentially along the casting path by a cooling steel roller 1 (8), a cooling steel roller 2 (7), a cooling steel roller 3 (10), a cooling rubber roller (6), and a guide cooling roller (5). The cooling steel roller 1 (8) and the cooling steel roller 2 (7) form a cooling calendering roller pair, and the cooling steel roller 3 (10) and the cooling rubber roller (6) form another cooling calendering roller pair. The rotation axis of the cooling steel roller 1 (8) and the cooling steel roller 2 (7) is located on a horizontal plane, and the rotation of the cooling steel roller 3 (10) and the cooling rubber roller (6) is... The axis is located on an inclined plane with an inclination angle α = 40°–50°; the inner cylinders (801) and outer cylinders (804) of the cooling steel rollers one (8), two (7), and three (10) are fitted together at intervals to form a cooling water cavity (805), in which spiral blades (802) of the inner cylinder and spiral blades (803) of the outer cylinder are staggered; the inner cylinder (601) and outer cylinder (604) of the cooling rubber roller (6) are fitted together at intervals to form a cooling water cavity (805), in which spiral blades (802) of the inner cylinder and spiral blades (803) of the outer cylinder are staggered. A rubber roller cooling water chamber (605) is formed by spacer assembly. The inner cylinder spiral blades (602) and outer cylinder spiral blades (603) are arranged within the cooling water chamber (605). A rubber coating layer (611) covers the outer cylinder wall of the outer cylinder (604). The frame (2) is supported on a traveling mechanism (3) via a lifting mechanism (4), which is movably supported on a moving track (1). The inner cylinder spiral blades (802) and outer cylinder spiral blades (803) have a specific rotation direction and pitch. The same spiral blades; the inner cylinder spiral blade (802) of the steel roller is fixedly installed on the outer cylinder wall of the inner cylinder of the steel roller (801); the outer cylinder spiral blade (803) of the steel roller is fixedly installed on the inner cylinder wall of the outer cylinder of the steel roller (804); the inner cylinder spiral blade (802) and the outer cylinder spiral blade (803) of the steel roller are corrugated blades; the inner cylinder spiral blade (802) of the steel roller is spaced apart from the inner cylinder of the outer cylinder of the steel roller (804), and the outer cylinder spiral blade (803) of the steel roller is spaced apart from the outer cylinder wall of the inner cylinder of the steel roller (801).

2. The EVA film speed-up casting machine according to claim 1, characterized in that: The first cooling steel roller (8) is rotatably supported on a steel roller support (18), which is slidably supported on a steel roller support slide rail (20), which is fixedly installed on the frame (2); the second cooling steel roller (7) is rotatably supported on a second steel roller support (17), which is fixedly installed on the frame (2).

3. The EVA film speed-up casting machine according to claim 2, characterized in that: A steel roller pressing cylinder (19) is fixedly installed on the frame (2), and the steel roller pressing cylinder (19) touches the steel roller support (18); a roller gap adjuster (15) and a roller gap calibrator (14) are installed between the steel roller support (18) and the steel roller support (17).

4. The EVA film speed-up casting machine according to claim 1, characterized in that: The cooling roller (6) is rotatably supported on the roller support (13), which is slidably supported on the roller support slide rail (12), which is fixedly installed on the frame (2); the cooling steel roller three (10) is rotatably supported on the steel roller three support (16), which is fixedly installed on the frame (2).

5. The EVA film speed-up casting machine according to claim 4, characterized in that: A rubber roller pressing cylinder (11) is fixedly installed on the frame (2), and the rubber roller pressing cylinder (11) touches the rubber roller support (13); a roller gap adjuster (15) and a roller gap calibrator (14) are installed between the rubber roller support (13) and the steel roller support (16).

6. The EVA film speed-up casting machine according to claim 1, 4 or 5, characterized in that: The inner cylinder spiral blade (602) and the outer cylinder spiral blade (603) of the rubber roller are spiral blades with the same direction of rotation and pitch; the inner cylinder spiral blade (602) of the rubber roller is fixedly installed on the outer cylinder wall of the inner cylinder (601) of the rubber roller; the outer cylinder spiral blade (603) of the rubber roller is fixedly installed on the inner cylinder wall of the outer cylinder (604) of the rubber roller.

7. The EVA film speed-up casting machine according to claim 6, characterized in that: The inner cylinder spiral blade (602) and outer cylinder spiral blade (603) of the rubber roller are corrugated blades; the inner cylinder spiral blade (602) of the rubber roller is spaced apart from the inner cylinder wall of the outer cylinder (604), and the outer cylinder spiral blade (603) of the rubber roller is spaced apart from the outer cylinder wall of the inner cylinder (601).

8. The EVA film speed-up casting machine according to claim 1, characterized in that: The rubber roller coating layer (611) covering the outer cylinder (604) of the rubber roller is coated with a thermally conductive silicone composition, which has the following weight percentage components: 94%-96% thermally conductive silicone and 4%-6% metal microspheres.

9. The EVA film speed-up casting machine according to claim 8, characterized in that: The metal microspheres are at least one of copper, silver and aluminum, and the particle size of the metal microspheres is 1-3 mm; the thickness of the adhesive layer (611) of the rubber roller is L = 4-6 mm.

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